Industry share: Preparation of a two-parent modified acrylate copolymer adhesive 1

16g octadecyl alcohol, 3.5g maleic anhydride, and 155g toluene were mixed evenly and poured into a round-bottom flask; The monoester of octadecyl maleate was obtained at 120℃ for 4h. 7g octadecyl maleate monoester, 8.5g polyethylene glycol 600, 0.8 g p-toluene sulfonic acid, and 65g toluene was poured into a round-bottom flask, mixed well, and reacted at 95℃ for 12h to obtain amphiphilic oligomers.

acrylate copolymer adhesive

Preparation of acrylate copolymer adhesive

(1) Take 6g methyl methacrylate, 4g butyl acrylate, 65g toluene, and 15g ethanol mixed evenly; Then 20g bisphenol A-glycyl glyceryl methacrylate resin (Bis-GMA) and 1g potassium persulfate were added in the stirring state, and the stirring temperature was 70℃ for 4h.

(2) Add 8g amphiphilic oligomer, 0.6g glycol dimethacrylate, 1g ammonium persulfate, stir and react at 75℃ for 5h;

(3) Add 0.1g ethylenediamine glyoxalic acid, 0.2g sodium hydrogen phosphate, 1g phosphate PM1510, and 8g silicon dioxide, and stir until evenly dispersed;

(4) In stirring state, vacuum, parental oligomer block modified acrylate copolymer adhesive.

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Industry Share: Preparation of a parent modified acrylate copolymer adhesive 2

Preparation of amphiphilic oligomers 13g octadecyl alcohol, 4g maleic anhydride, and 35g toluene were mixed evenly and poured into a round-bottom flask; Octadecyl maleate was obtained by reaction at 90℃ for 13h. 5g octadecyl maleate monoester, 6.5g polyethylene glycol 600, 0.2g p-toluene sulfonic acid, and 50g toluene was poured into a round-bottom flask, mixed evenly, and reacted at 80℃ reflux temperature for 22h to obtain amphiphilic oligomers.

acrylate copolymer adhesive preparation (1) take 7g ethyl methacrylate, 14g methyl acrylate, 75g xylene, and 25g ethanol mixed evenly; Then, 15g of bisphenol A vinyl alcohol methyl diacrylate and 2g potassium persulfate were added in the stirring state, and the reaction was stirred at 75℃ for 4h. (2) Add 15g of the amphiphilic oligomer, 0.5g glycol dimethacrylate, and 1g ammonium persulfate, stir and react at 75℃ for 5h; (3) Add 0.4g ethylenediamine tetrahydrate, 0.2g citric acid, 1.5g phosphate PM1500, 10g silicon dioxide, and stir until evenly dispersed; (4) In stirring state, vacuum, parental oligomer block modified acrylate copolymer adhesive.

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Several examples of acrylic pressure sensitive adhesive

Example 1 of acrylic pressure-sensitive adhesive

Raw material: Monomer phase (40%): butyl acrylate (BA), methyl methacrylate (MMA)\ acrylic acid (AA);

Non-monomer phase (60%): sodium dodecyl sulfate (SDS), ammonium persulfate, polyethylene glycol octyl phenyl ether (OP — l0);

In four flasks equipped with an electric agitator, reflux condenser tube, thermometer, and drip funnel, according to the feeding method, requirements

Line emulsion polymerization. During the reaction, the monomer conversion rate was measured by sampling at regular intervals. After the reaction is complete, cool and filter the emulsion,

Adjust the pH of the emulsion with ammonia water to pH 8 or so to obtain polyacrylate pressure-sensitive adhesive.

transparent PE protective film

Example 2 of acrylic pressure-sensitive adhesive

The monomers toluene (butyl acrylic vinegar) and dibenzoyl peroxide (BPO) were put into a reflux condensing tube, thermometer, and guide pipe, and stirred.

The polymerization was carried out under nitrogen protection at 353K in a four-port flask of the mixer, and the reaction was continued for 3 hours after the exothermic reaction. However,

After adding BPO/ toluene solution, the reaction continued to produce a colorless transparent viscous liquid, with a monomer conversion rate of more than 90%.

Example 3 of acrylic pressure-sensitive adhesive

Raw materials: acrylic acid (AA), methyl acrylate (MA), butyl acrylate (BA), acrylic acid – 2 – hydroxyethyl ester (HEA), acrylic acid

Ethyl hexyl ester (EHA), ammonium persulfate (APS), sodium bicarbonate (Nah-CO), ammonia (NH·HO), tert-butyl hydrogen peroxide, white powder, the above are all industrial products, deionized water (self-made), compound emulsifier (self-prepared).

Preemulsification: In the reaction bottle with an electric mixer, add emulsifier and deionized water, start the mixer, and add in order

Amount of acrylic acid, methyl acrylate, butyl acrylate, hydroxyethyl acrylate, and amount of 1/2 acrylic acid – 2 – ethyl hexyl ester.

Stir for 10min, then add the remaining 1/2 acrylic acid — 2-ethylhexyl ester. Continue stirring for 30min, sample, and measure viscosity.

It is qualified when the viscosity reaches above 0.120Pa·S. Polymerization: Fitted with an electric mixer, thermometer, reflux condenser, and droplet.

A quantitative amount of deionized water, emulsifier, and sodium bicarbonate was added to the four-port flask of the funnel. The agitator was started and heated to 70℃

Add 1/8 of the pre-emulsion, continue heating to 80±2℃, and then add 2/3 of the total initiator (initiator prepared in advance

10% solution), control the temperature within the range of 84±2℃, after the blue light appears in the reaction bottle, the remaining pre-emulsion and initiation are added respectively

Agent, control drop acceleration, at about 3h dripping finished. Under a constant temperature of 84±2 ℃ for 1h, the viscosity of sampling analysis should be 0.25 ~ 0.8Pa·s, pH

The value is 5.0 ±0.5. Then add quantitative tert-butyl hydrogen peroxide, stir for 30min, add the appropriate amount of hanging white powder solution, and stir for 15min. Add last.

The pH value of ammonia is about 7.5, and the residue is filtered out to obtain emulsion acrylic pressure-sensitive adhesive.

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What is the water-based acrylic resin in the pressure sensitive adhesive?

Water-based acrylic resin is generally divided into water-based emulsion type acrylic resin and water-based solid acrylic resin.

Water-based emulsion acrylic resin, generally can be seen are water-based emulsion-type acrylic resin, that is, the acrylic emulsion is often said. It’s an emulsion acrylic resin. This kind of product does not take methyl acrylate monomer down reaction, so this kind of resin polymerization is certainly a lower glass temperature than solid acrylic resin. They have lower TG, so some substrate (soft) applications are not comparable to other solid acrylics. In particular, paper, leather, and other soft substrates are the best embodiment.

When they are benzene, vinegar also became a benzene acrylic emulsion, vinegar acrylic emulsion is also often seen as styrene acrylic emulsion, vinegar acrylic emulsion, and pure acrylic emulsion. In fact, it just refers to the addition of styrene, ethylene acetate, and other monomers in emulsion polymerization, so that they have other properties. And with a simple acrylate down the reaction is called pure acrylic resin, also called pure acrylic emulsion. The other biggest use of these resins is in architectural coatings, which account for a large share of the market.
water-based acrylic structure pressure sensitive adhesive

Water-based solid acrylic resin, this kind of resin our domestic development is slower. In my own small opinion, haven’t seen domestic enterprises in the production, this kind of resin is mainly in Germany, South Korea, Japan, Taiwan, and a few other countries in the production, their current application is paper glazing oil and printing ink. There are other uses waiting to be developed.

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Modification of acrylic adhesives

Polyacrylate is a kind of polymer with a variety of properties, and a wide range of uses, the emulsion is generally methyl acrylate, ethyl acrylate, or butyl acrylate as the main monomer, and methacrylate monomer, styrene, acrylonitrile copolymerization emulsion formation. By improving the structure of the polymer or the polymerization method, the properties of the modified acrylate adhesive are more excellent.

1. Modification of silicone

Organosilicone resin has excellent high and low-temperature resistance and water resistance. Modification of polyacrylate emulsion adhesives by organosilicon has become a hot research topic in recent years. Organofunctional alkoxy silane is widely used in adhesives, sealants, and coatings as a bonding accelerator and crosslinking agent. Experts have studied a special water-based system of organosilane Wz-A in the application of water emulsion polyacrylic sealant, this water-based silane can significantly improve the mechanical properties and bonding properties of sealant without changing the stability of the product, the addition of Wz-A in 0.8%-1.6% is more appropriate. Experts through the emulsion polymerization method, using hydroxy-silicone oil and silane coupling agents A-151 and KH-570 for chemical modification of acrylate, with the silane coupling agent in the carbon-carbon double bond and siloxane structure to connect hydroxy-silicone oil and acrylate, the results found that through KH-570 modified acrylate emulsion adhesive in the performance has been significantly improved. Vinyl-modified silicone emulsion was prepared by ring-opening polymerization of octamethylcyclotetrasiloxane and vinyl-terminated silane coupling agent. When the reaction temperature is 80℃, the catalyst is dodecylbenzene sulfonic acid, and the silane coupling agent is A-151, the core-shell emulsion has A high conversion rate of vinyl-modified silicone emulsion monomer and good emulsion stability. Using the emulsion as seed emulsion to modify polyacrylate emulsion, a kind of printing adhesive with good softness and the color fastness can be prepared.
PE protective film for aluminum adhesives

2. Epoxy Modification

By grafting copolymerization of acrylic ester and epoxy resin, the epoxy group can be crosslinked under the action of the curing agent, so that the system can finally form an interpenetrating network structure with epoxy resin crosslinked network as the skeleton and acrylic resin through it. The modified polyacrylate emulsion has the characteristics of high strength of epoxy resin, good adhesion, excellent weather resistance of acrylate, and good flexibility. Chemical experts use core-shell polymerization technology, the mass fraction of epoxy resin is 30%, copolymer glass temperature is 243.15K, can prepare curable emulsion pressure sensitive adhesive, curing of aluminum alloy bonding strength up to 10MPa, adjust the proportion of epoxy resin and polymer glass temperature, can change the performance of pressure sensitive adhesive. The epoxy resin was added into the polymerization system, and the epoxy resin-modified vinegar-propyl emulsion adhesive was prepared by emulsion polymerization. The bonding strength, film-forming properties, film hardness, and stain resistance of the adhesive were improved to different degrees. The product can produce good results when used as an adhesive.

3. Blending modification

The acrylic adhesive modified by crosslinking and copolymerization sometimes has some shortcomings such as poor weather resistance, low temperature, and poor stability. Experts used benzoxazine with high heat resistance and acrylic copolymerization emulsion to get the excellent performance of modified polyacrylate adhesive. Under the action of heating and catalyst, the ring-opening polymerization of benzoxazine was carried out to form a nitrogen-containing network structure similar to phenolic resin. After curing, the adhesive formed an interpenetrating network structure. The modified adhesive obtained has the characteristics of high-temperature resistance, dimensional stability, flame retardant, and environmental friendliness. The use of benzoxazine improved the heat resistance of the substrate, and the substrate made of modified adhesive could not be stratified or bubbled in the tin bath at 350℃ for 10s.

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Crosslinking of acrylate copolymers in pressure sensitive adhesives

In order to make the acrylic ester pressure-sensitive adhesive have better adhesion, must make the copolymer have a higher weight average relative molecular weight, however, such adhesives, especially solution pressure sensitive adhesive, often in viscosity too large and difficult to coat. Without too much, if the relative molecular mass and viscosity are not too much of a copolymer in the coating or coating after proper crosslinking, and can solve the contradiction of performance and worker Kou. At the same time, crosslinking can improve the high-temperature resistance, solvent resistance, and aging resistance of pressure-sensitive adhesives, so the crosslinking of acrylate copolymer has very important practical value.

compositing

Specific cross-linking methods can be summarized as follows:

(1) The use of active hydroxymethyl condensation reaction and crosslinking, and N- hydroxymethyl acrylamide copolymerization and acrylic copolymer, alone or acid catalyst heating, can be due to active N- hydroxymethyl mutual condensation self-crosslinking, known as self-crosslinking, can also be added crosslinking agent, known as a diplomatic link. Hydroxyl or carboxyl acrylate copolymer and active hydroxyl methyl crosslinking agent, heating or acid-catalyzed heating, due to hydroxyl methyl or ether hydroxyl methyl and hydroxyl or carboxyl between the condensation reaction and crosslinking.

(2) The copolymer of acrylate containing hydroxyl, carboxyl, and secondary amine by isocyanate reaction can be crosslinked with a polyisocyanate and its addition. The synthetic properties of the pressure-sensitive adhesive obtained by this crosslinking method are excellent.

(3) cyclic guilt resin or polycyclic guilt compound can be used for acrylate copolymers containing amine, hydroxyl, and carboxyl groups without epoxy reaction crosslinking, while polyamine or polyanhydride can be used for acrylate copolymers containing epoxy group crosslinking.

(4) Using the reaction of alkoxy compounds and the cross-linked alkoxy compounds such as tetrabbutoxy titanium, tetrisopropoxy titanium, tri isopropoxy aluminum can be quickly esterified or alkoxy exchange reaction with the carboxyl group or hydroxyl group of acrylate copolymer at room temperature or low temperature.

(5) ionic cross-linking metal salts, such as acetic acid, caprylic acid, naphthenic acid, lauric acid, and other organic acid salts of polyvalent or monovalent metals such as zinc, lead, sodium, cobalt, and carboxyl acrylate copolymer crosslinking.

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The development of environmental protection adhesive

“Environmental protection, health, safety” is a global topic, but also the focus of the industry. The flexible packaging industry is no exception, especially in recent years, the rapid growth of the flexible packaging industry and the wide application of flexible packaging, the impact on the environment, health, and safety problems are increasingly prominent, among them, flexible packaging compound adhesive has been one of the core issues discussed. At present, countries all over the world are actively exploring the alternative products of two-component solvent-based polyurethane adhesives, such as solvent-free adhesives, hot melt adhesives, water-based polyurethane adhesives, alcohol-soluble polyurethane adhesives, and other environmental adhesives, and has made great progress in some fields.

Environmental protection adhesive research and development and marketing, countries have taken a very different way, take different measures. In Europe, the research of water-dispersed polyurethane adhesives and solvent-free adhesives has been at the forefront, and its market development is fast. In the United States, reactive hot-melt adhesives have developed rapidly, but no new adhesives can completely replace solvent-based two-component polyurethane adhesives. Moreover, from the overall situation of the current market, the demand for solvent-based polyurethane adhesives is still growing, and the growth amount is far more than other types of adhesives.

1. Water-based

The water-based adhesive is prepared water-based adhesive with water as a solvent or dispersing medium. Because of the absence of organic solvent, solvent pollution is eliminated. It should be pointed out that not all water-based adhesives are pollution-free, such as urea-formaldehyde glue and 107 glue are water-based glue, but pollution is very serious. Emulsion acrylate pressure-sensitive adhesive can replace solvent-based pressure-sensitive adhesive. Water-based refilm adhesive has begun to replace solvent-based refilm adhesive, non-toxic, non-combustion, pollution-free, and safe to use. A new type of water-based polyurethane adhesive has been developed in Japan, which is suitable for automobile interior decoration and may replace the current common solvent adhesive. In polyvinyl alcohol (PVA) aqueous solution with isocyanate or prepolymer, vinyl polyurethane emulsion, can replace the urea aldehyde glue, and completely solve the problem of formaldehyde release. Water-based adhesives are favored for their non-toxicity and non-pollution, but their shortcomings are slow drying speed, poor water resistance, and poor frost resistance. The solid part should be increased, the drying speed should be accelerated, and the cross-linking method should be adopted to improve the drying speed and water resistance, so as to expand its application.

water-based adhesive

2. No solvation

Solvent-free refers to an adhesive that does not contain solvent, because no solvent in the atmosphere volatilized, will not cause pollution and harm. The vast majority of epoxy adhesives, anaerobic adhesives, cyanoacrylate adhesives, aerobic modified acrylate structural adhesives, solvent-free polyurethane adhesives, and photocuring adhesives are solvent-free varieties.

3. Solidization

Solid is the adhesive used in solid forms, such as hot melt glue, hot melt pressure sensitive glue, water-soluble powder glue, reaction type stick glue, and office solid glue stick, with no volatiles released in the coating and bonding process, completely no environmental pollution. Foreign countries recommend the use of powder adhesive with stable performance, no environmental pollution, and other advantages. American CP adhesive company produced a urea-formaldehyde tree fat powder, that contains a curing agent and filler, no smell, no pollution, and no poison, used as an excellent universal wood adhesive. In China, there has been a new type of high-strength and high-quality powder adhesive — Bangjia strong adhesive powder, mixed with water to become a polymer dispersion, with outstanding adhesion, water resistance, and aging resistance. The United States produced an epoxy glue stick for emergency repair, plugging very conveniently.

adhesive

4. Solvent-based adhesives use low-toxic and non-toxic solvents

Solvent-based adhesives have fast drying speed and good water resistance. Although they are polluted and toxic, they cannot be completely replaced by water-based adhesives at present. Non-toxic or non-toxic solvents can be used, such as cyclohexane, ethyl acetate, dimethyl carbonate, etc., to make non-toxic or low-toxic solvent-based adhesives. The domestic market has appeared in shoes with no “triphenyl” polyurethane adhesive, grafting chloroprene adhesive, and SBS-type special effects all-purpose adhesive. Dimethyl carbonate (DMC) is a new and good solvent with low toxicity. DMC has been used as the main solvent for the preparation of solvent-based adhesives in Japan, and large-scale production has been formed in China.

The new cleaner production technology can realize the unity of economic benefit and environmental benefit and produce environment-friendly adhesive. Ditch the smelly methyl methacrylate in favor of a higher boiling point monomer. Production of modified acrylate fast-setting structural adhesive. In the adhesive preparation and production process do not use toxic raw materials, such as formaldehyde, chlorinated solvent, aromatic solvent, containing a toxic heavy metal filler, etc. In non-toxic and harmless conditions for production, such as using polyformaldehyde instead of formaldehyde solution to produce a modified amine curing agent. By increasing the dosage of hydrochloric acid and reducing pH, the reaction of polyvinyl formaldehyde can be more complete, the content of free formaldehyde can be reduced to less than 0.2%, and the smell of formaldehyde can not be heard basically. Adding formaldehyde catcher, such as starch, polyvinyl alcohol, melamine, etc., can significantly reduce the content of free formaldehyde in urea-formaldehyde resin adhesives. Among them, oxidized starch had a better effect than ordinary starch, and the content of free formaldehyde was less than 0.1%.

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Classification of environmentally friendly adhesives

Solvent-free adhesive

(1) Solvent-free adhesive, also known as reactive adhesive, is the two components that can be chemically reacted are respectively brushed on the surface of the bonded material, and the components are in close contact under certain conditions to achieve the purpose of chemical reaction crosslinking. The two components must have strong adhesion to their respective adhesives, and reaction time, pressure, temperature, and other technological factors are appropriate. It is reported that a new single-component solvent-free sealant with low molecular mass polyisobutylene polymer as the main body and prepared with various additives is developed in our country. The rubber is cheap, easy to construct, has good weather resistance and permanent bonding performance, and can ensure the sealing between the auto sheet metal and the rubber seal strip. Another kind of non-polluting two-component polyurethane adhesive with good bonding performance, low-temperature curing, and low cost solves the problem of low-temperature curing difficulty. Solvent-free adhesive solvent-free volatilization does not cause pollution, of course, should also be used in the process of no harmful small molecule release. At present, this adhesive mainly consists of hot melt adhesive. This kind of adhesive has no pollution, fast curing, wide bonding surface, is suitable for continuous production, and easy storage, and transportation.

Water-based adhesive

(2) Water-based adhesive is one of the oldest varieties. In ancient times, people used water-soluble polymers containing bone glue, casein, and other natural substances as adhesives. It wasn’t until the early 1960s that the field saw new developments. In recent years, safety and pollution-free, especially solvation-free, have been promoted in the development of water-based adhesives. Water-based adhesives are adhesives that take water as a dispersing medium and are divided into water-soluble adhesives, water-dispersed adhesives, and water-emulsion adhesives, which are a major category of environmental protection adhesives. Water-based adhesive is to take water as the dispersion medium of polymer, when the polymer is soluble in water, called water-soluble adhesive, and when the polymer with the effect of an emulsifier, dispersed in water, is called water emulsion adhesive. The advantages of water-based adhesive are: friendly to the environment, non-toxic, non-combustible, high solid content, available for existing application equipment and equipment is easier to clean. For example, water-based acrylate adhesive modifies water-based acrylate through organosilicon, which can give acrylate emulsion some new properties. In recent years, water-based adhesive environmental protection adhesive has developed rapidly in our country, while the output is growing, product quality is improving, increasing varieties, some high technical content and good performance of adhesives continue to appear, such as cold resistance and water resistance of good latex, scrub resistance, pollution resistance, and water resistance of organically modified acrylic acid building emulsions.Protective Film Manufacturer Banner-3

Inorganic adhesive

(3) Inorganic adhesive is a series of adhesives composed of inorganic salts, inorganic acids, inorganic bases, and metal oxides. The inorganic adhesive is a new type of adhesive, and many varieties, according to the curing conditions are divided into gas dry type, water solid type, hot melt type, and reaction type. Inorganic glue is mostly made of a solid and liquid mixture into a paste, raw materials are easy to obtain. The general organic adhesive can withstand high temperatures usually below 100 ℃. Such as latex below 60 ℃, epoxy resin at about 100 ℃, and phenolic resin at about 220 ℃. The inorganic adhesive can withstand the high temperature of 600 ~ 900 ℃, and the improved composition can reach more than 1 800 ℃. Usually water soluble, low toxicity, no combustion, no environmental pollution; The coefficient of thermal expansion is small, only 1/10 of steel, ceramic 1/3; Oil resistance, radiation resistance, no aging, good durability, but not acid, alkali corrosion, water resistance is poor, brittleness is larger, not impact resistance. Can be cured at room temperature, and basically does not shrink, but some slightly expanded. Socket and groove bonding strength is high, and should not be flat. The sleeve tensile shear strength is greater than 100 MPa.

Inorganic adhesive

Natural glue and modified natural glue

(4) Natural glue and modified natural glue is the earliest adhesive used by human beings, so far has thousands of years of history, in the development of human society and the historical process, but played a great role in promoting and promoting, such rubber raw materials are easy to obtain, simple production process, convenient use, generally water-soluble, and most non-toxic. There are many varieties of natural adhesives, which can be divided into plant adhesives, animal adhesives, mineral adhesives Marine biological adhesives, etc., and according to the chemical structure can be divided into glucose derivatives, amino acid derivatives, and other natural resin adhesives.

adhesives

adhesives

 

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Purpose and significance of developing environmental adhesive

Adhesive refers to the surface of homogeneous or heterogeneous objects connected together with adhesive technology, with continuous stress distribution, lightweight, or sealing, most process temperature low characteristics. Bonding is especially suitable for the connection of different materials, different thicknesses, ultra-thin specifications, and complex components. Rubber is near the generation of the fastest development, application industry is very wide, and has a significant impact on the progress of high-tech science and technology and people’s Daily life improvement.

BIO

Environmental problems with adhesives are caused by harmful substances in adhesives, such as volatile organic compounds, toxic curing agents, plasticizers, diluents and other additives, and harmful fillers. The harmful substances in the adhesive are mainly benzene, toluene, formaldehyde, methanol, styrene, trichloromethane, carbon tetrachloride, 1, 2 – dichloroethane, toluene diisocyanate, m-phenylenediamine, tricresol phosphate ester, ethylenediamine, dimethylaniline, antioxidant D, coal tar, asbestos powder, quartz powder, etc.

Environmental protection rubber refers to no harm to the human body in the process of use, green environmental protection, etc. The environmental protection characteristics of woodworking glue are mainly reflected in the smell. The general smell of glue is very strong, which is very harmful to the human body. Environment-friendly glue generally has a very light smell and volatilizes quickly. It is completely volatilized within 24 hours. This kind of glue is environmentally friendly.
PE protective film for glass usage

With the improvement of the social economy and living standard, adhesives are playing an increasingly important role in People’s Daily life and production. Because adhesive has a wide range of applications, easy to use, high economic benefits, whether in advanced technology or in the general modern industry, adhesives are playing an extremely important role. With the improvement of environmental laws and regulations and the deepening of people’s awareness of environmental protection, environmental protection adhesive will become the mainstream of the adhesive market in the future.

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Production of pressure sensitive adhesives

The history of pressure-sensitive adhesives

Pressure-sensitive tape originated in 1600 BC in the Han Dynasty period, in the Herbal Supplement, Huangdi Neijing, records the treatment of pain plaster cloth. It is the embryonic form of pressure-sensitive glue made of Chinese herbal medicine, turpentine, and animal glue. Later, it has been continued in the ointment products in the field of Chinese medicine. By the 8th century, ancient Egyptians discovered the use of pine balm and wax to make ointment and medicine.
PE-protective-film-for-glass

The first patent for making medical plaster from natural rubber appeared in 1845. The industrial development of medical adhesives was first started by Johnson Brothers in the United States in 1870. After long-term research, they invented a medical adhesive for a long time in 1890. In 882, German pharmacist Beiersdorf added zinc oxide which could neutralize the acidity of rosin into natural rubber and rosin and made white zinc oxide plaster which was less irritating to the skin. This is the earliest modern pressure-sensitive adhesive product, so China and foreign countries are in the production of pressure-sensitive adhesive tape from the medical adhesive paste. It laid the foundation for today’s medical plaster. In the 1920s, the appearance of plastic pressure-sensitive adhesive tape for electrical insulation made pressure-sensitive adhesive products enter the field of industrial application.

However, it was not until R.G. Gray of 3M Company invented paper-based masking adhesive tape and transparent cellophane adhesive tape that the range of industrial applications of pressure-sensitive adhesive products was really expanded. Since then, two-sided adhesive tape, pressure-sensitive adhesive labels, adhesive sheets for printing, BOPP(directional tensile polypropylene) packaging tape, and many other uses of pressure-sensitive adhesive products have appeared. The pressure-sensitive adhesive materials used are also extended from natural rubber to various synthetic rubber, polyethylene ether, polyacrylate, silicone polymer and thermoplastic elastomer, and other synthetic materials.

PE-protective-film-for-PVC-profile

Since the late 1950s, a series of basic theoretical issues such as the adhesion phenomenon, adhesion characteristics, and the relationship between the structure and performance of pressure-sensitive adhesives have been studied step by step, so that the development of pressure-sensitive adhesives and their products is gradually built on a solid foundation, especially after entering the 1960s, a variety of excellent performance acrylic pressure sensitive adhesive system development, The application range of pressure-sensitive adhesive products has been rapidly expanded, and the industry of pressure-sensitive adhesive and its products has also been developed at a high speed.

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