Advantages of hydrophilic adhesives

Hydrophilic adhesives usually have the following advantages:

  • hydrophilic adhesive and hydrophobic adhesive can provide greater adhesion, because of the affinity

The surface energy of water-based adhesives is generally higher and closer to that of biological substrates such as skin and mucous membranes.

  • Hydrophilic adhesives are compatible with a wide range of drugs, excipients, and additives.
  • The plasticizing effect of the water absorbed by the hydrophilic adhesive from the hydrated skin or mucous tissue can be enhanced

Adhesion, as opposed to hydrophobic adhesives.

  • The increased solubility of the drug in the hydrophilic adhesive helps to control the drug release kinetics.
  • Use a hydrophilic adhesive based on a hydrophilic polymer, which can extend the level of adhesion – cohesion. The ability to control and manipulate
  • The binding properties of hydrophilic polymers are much less sensitive to their molecular weight than hydrophobic polymers

This is caused by specific intramolecular and intermolecular interactions within the hydrophilic binder.

Hydrophobic PSA can be prepared by adding a non-viscous hydrophilic polymer and filler to a hydrophobic adhesive.

white PE protective film with printing

Class “hydrophilic” and improve the hydrophilicity of the adhesive composition, for example, Polyisobutene (PIB)PSA is hydrated by adding cellulose and cellulose derivatives (US Patent 4231369), polyvinyl alcohol (PVA), pectin and gelatin (US patents Ns4367732 and 4867748), and silica (US patent N5643187). Rubber binders can also be administratively modified by filling them with amphoteric surfactants, or by treating PSA polymers with plasma 30 oxygen discharge. Acrylic PSA can be hydrophilic by adding PVP (US patent N5645855). Although hydrophilic treatment of hydrophobic adhesive has some effect, it will lead to a partial loss of adhesion.

Therefore, there is a need for a new hydrophilic adhesive composition suitable for a wide range of applications, such as locally applied drug delivery systems, which can meet all of the above criteria and provide an effective drug release rate for any active agent, whether hydrophilic, ionic or lipophilic.

/0 Comments

High temperature resistance and antistatic are essential characteristics of pressure sensitive tape

High temperature resistance and antistatic are essential characteristics of pressure sensitive tape

This paper relates to a pressure-sensitive adhesive tape structure that can be used to mask printed circuit boards (PCBs) at high temperatures associated with wave welding operations. This type of adhesive tape consisting of ionic conductive polymeric particulate adhesive has high friction electrostatic resistance and thus can protect electronic components from static electricity formation. In addition, when the adhesive mask tape is removed from the PCB, no adhesive residue will stain the surface of the board.

Process description

Wave welding is commonly used to permanently attach electronic components to printed circuit boards. During wave welding connections, the various methods used to mask or cover the plate do not want flux in the area. Such masks are known to be obtained using self-adhesive tapes based on high temperature resistant polyimide films coated with silicone-based adhesives. However, the removal of such adhesive strips from the surface of the electronic assembly results in a frictional charge caused by static electricity, which damages sensitive electronic components and leads to contamination of the printed circuit by silicone.

Conductive tape can also be used for masks. Conductive tape does not cause friction charges as easily as tape made of insulating material such as silicone, so the use of conductive tape reduces the failure rate of electronic components during assembly operations.

pressure sensitive tape

A variety of different types of conductive strips are known to be available at room temperature using US patents 31049853832,598 and 4749612 describe adhesive strips with a carbon black binder coating that is said to eliminate static charges. Many patents also reveal multilayered ribbon structures in which one, usually buried, the layer is conductive.

For example, Japanese publication J63012681-A reveals a strap with an intermediate antistatic polymer layer between the polyolefin substrate and the rubber bonding layer.

European patent EP0422919-A2 discloses a band having a conductive particle or foil layer surrounded by a binder between a polymer film substrate and a silicone binder layer. It is said that the use of a high-temperature film substrate, polyimide, combined with a silicon binder and an adhesive can produce a tape that performs well as a wave welding mask at high temperatures where previous antistatic strips are not applicable. That is, the tape can remain intact in the wave welding groove at a temperature of 250℃ for 5 seconds.

/0 Comments

Technical requirements exist for the desired properties of adhesives for use on human skin and/or mucosal tissues

Technical requirements exist for the desired properties of adhesives for use on human skin and/or mucosal tissues.

“Bioadhesiveness” is defined as a biological tissue that is highly hydrated. For example, the pressure-sensitive adhesion of mucosal tissue. In contrast, to conventional Psas (rubber, polysiloxane, and acrylates), which bond primarily to dry substrates, bioadhesives (BA) exhibit good viscosity when bonded to hydrated biological substrates.

As a bioadhesive, water should provide a plasticizing effect on the polymer, i.e. the polymer should be hydrophilic. For example, the general BA range includes partially crosslinked polyacrylates and polymethacrylate (EP0371421) and hydrophilic cellulose derivatives (40-95%) in blends with ethylene glycol (PEG). When the cross-linked polymer expands in sufficient amounts of water, the bioadhesive becomes sticky. the cohesive strength of highly cohesive hydrophilic compounds is usually very low, and BA differs from PSA in this respect.

adhesive

For a variety of practical applications, it is very useful to have a batch of PSA and BA polymer materials with different hydrophilic properties, thus having different solubility in water or in the fluids excreted by the skin and mucous membranes (sweat, mucus, saliva, etc.). Biegajski et al described the performance of combining class PSA with Class BA in US Patent 5700478.

The combined attempt, in which a water-soluble pressure-sensitive mucosal adhesive was obtained by mixing 95-40% polyethylpyriloidone (PVP) with 0-50% hydroxypropyl cellulose (HPC) and 11-60% glycerin. Other examples of hydrophilic polymer mixtures with PSA and BA composition properties include polyacrylate-polyvinyl alcohol (PAA-PVA) copolymerization complexes, which consist of hydrogen passing between monomer units of complementary polymer chains.

Formed by bonding and plasticized with PEG-200, glycerol, or polypropylene glycol (PPG), the molecular weight of 425g/mo1(German patent application DE4219368).

There are intractable and conflicting technical requirements for the desired properties of adhesives intended for use on human skin and/or mucosal tissues.

/0 Comments

Background of the invention of pressure sensitive adhesive for viscosifying emulsion

Background of the invention of pressure sensitive adhesive for viscosifying emulsion

The emulsion pressure-sensitive adhesive in this paper, when this adhesive is combined with the applicable viscosifier, it has good convertibility and good low-temperature performance when the amount of glue is lower than that of the conventional system used for general labels.

Usually, pressure-sensitive adhesives are prepared by solvent polymer, bulk polymer, and emulsion polymer. Some polymers are pressure-sensitive adhesives because of their properties, that is, their intrinsic adhesion, while others require viscosification to achieve adhesion. My earlier patents, US Patent 5164444 and US Patent 5189126(both of which have been included herein for information) describe emulsion pressure-sensitive adhesive polymers with excellent properties and good convertibility at room and low temperatures.

pressure sensitive adhesive

It is well known that to improve the adhesion with non-polar substrates such as polyolefin, acrylic-based pressure-sensitive adhesives can be increased. However, most available viscosities have low molecular weights compared to adhesive polymers, and their addition to polymers reduces the shear properties and conversion properties of adhesives. The adhesion of this adhesive to other substrates (such as recycled corrugated cardboard) is often poor. In addition, the viscosification of pressure-sensitive adhesives can usually improve the performance at room temperature, but can not improve the performance at low temperatures, and in most cases, the performance of viscosifying adhesives is worse than that of non-viscosifying pressure-sensitive adhesives.

Thus, operational characteristics appear to be largely determined by the choice of viscosities, their functional groups, and their concentrations.

Kealy et al., US Patent 4418120, disclose a crosslinked acrylic adhesive with high adhesion to a low-energy substrate. The adhesive is composed primarily of isooctyl acrylate and a solution polymer containing 3-7%(by weight) acrylic acid. It was prepared by mixing 100 parts of solution polymer with 20-50 parts of viscosifying rosin esters whose acid value was lower than 20. The adhesive also contains antioxidants and crosslinking agents, which are dried at 70℃ after coating and crosslinked. To achieve the specified performance, the composition is required to contain no surfactant.

/0 Comments

Pressure-sensitive adhesive is a hydrophilic polymer

Pressure-sensitive adhesives are well known and have been used for many years in a variety of industrial, consumer, and medical applications. Pressure-sensitive adhesives are typically viscous and adhere instantly when applied to the substrate. A variety of polymers have been used to make pressure-sensitive adhesives, such as acrylic and methacrylate homopolymers or copolymers, butyl rubber-based systems, polysiloxane, polyester, ethyl ester, ethyl amide, olefin copolymer materials, natural or synthetic rubber, etc. All Psas are elastomers, that is, they exhibit the characteristic viscoelasticity of rubber.

pressure sensitive acrylate adhesive

Pressure-sensitive adhesives are widely used in percutaneous drug delivery devices or “patches” that adhere to skin or mucous tissue at the time of use. The adhesion, transport, storage, and biological properties of various cohesive compounds form the basis for their application in percutaneous drug delivery systems, as described below:

High viscosity with the best-sliding adhesion transition point:

The drug release dynamics are controlled by the rate of transdermal drug delivery and the operating life of the device:

A drug whose compatibility and efficiency remain stable with the addition of related drugs:

Biological properties: No toxicity, no irritation, or sensitization to the skin.

Such diversity is difficult to combine into a single system.

Examples of pressure-sensitive adhesives that have been suggested for use in percutaneous delivery systems include polysiloxane

30(e.g., polydimethylsiloxane, polyphenyl siloxane, and siloxane mixtures), polyisobutene, polyacrylates, acrylate-acrylate copolymers (e.g., copolymers of acrylic acid with 2-ethylhexyl acrylate or isoctylacrylate), And viscous rubber such as polyisobutene, polybutadiene, polystyrene-isoprene copolymer, polystyrene-butadiene copolymer, and chloroprene (diene) rubber (polychloroprene). All of these Ps are hydrophilic polymers. They have the common disadvantage of losing adhesion to hydrate substrates.

/0 Comments

Odorless pressure sensitive adhesive tape can meet various customer requirements

At present, the pressure-sensitive adhesive produced by various manufacturers at home and abroad is divided into the single side and double side, but whether it is single side or double side pressure sensitive adhesive tape is made of hot melt adhesive coated on the tape cotton paper.

The problem is that the hot melt adhesive used in the production of pressure-sensitive adhesive tape has a strong smell, even a pungent smell, which leads to the smell of pressure-sensitive adhesive tape on many occasions and products can not be used, and does not meet the requirements of environmental protection.

Odorless pressure sensitive adhesive

Our aim is to provide an odorless pressure-sensitive adhesive tape to meet various customer requirements. The new odorless pressure-sensitive adhesive tape is realized in the following way: the odorless pressure-sensitive adhesive tape has the same structure as the ordinary odor pressure-sensitive adhesive tape, which is usually composed of colloidal layer, tape cotton paper, anti-stick paper (double-sided pressure-sensitive adhesive tape, single side generally no) through coating composite.

The main technical characteristics of odorless pressure-sensitive adhesive tape are that special odorless hot melt adhesive is used to replace ordinary odorless hot melt adhesive to make the colloidal layer of pressure-sensitive adhesive tape. The structure and production method of other odorless pressure-sensitive adhesive tape are basically the same as that of ordinary pressure-sensitive adhesive tape.

Compared with the existing products, the odorless pressure-sensitive adhesive tape made according to the above scheme has the following advantages: 1. Odorless pressure-sensitive adhesive tape has the characteristics of non-toxic, odorless, strong viscosity and good moisture-proof performance; 2, completely solves the odor problem of ordinary pressure sensitive adhesive tape, so as to be widely used to meet the needs of different industries and different customers.

It is made of special odorless hot melt glue made of colloidal layer and colloidal layer, tape cotton paper, and anti-stick paper. The colloidal layer and the colloidal layer have the same structure and material, which are coated on the upper and lower surfaces of the adhesive tape cotton paper and then compounded with a layer of anti-stick paper on the surface of the colloidal layer. According to the above method, the odorless double-sided pressure-sensitive adhesive tape can be divided and rewound, cut, and packaged.

/0 Comments

Elastic type pressure sensitive adhesive has little environmental pollution and is widely used in various fields

Pressure-sensitive adhesive, short for pressure-sensitive adhesive, is a kind of adhesive with pressure sensitivity, mainly used for the preparation of pressure-sensitive tape, its role is to make the tape with pressure-sensitive adhesion characteristics.

Acrylic Pressure Sensitive Tape

Pressure-sensitive adhesive can be divided into rubber type and resin type according to the main resin composition. Rubber type can be divided into natural rubber and synthetic rubber; Resin type mainly includes acrylic acid, silicone, and polyurethane. Among them, rubber pressure sensitive adhesive, also known as elastic type pressure sensitive adhesive, is widely used in various fields because of its good bonding strength and small pollution to the environment. In the prior art, the temperature resistance of the rubber pressure-sensitive adhesive is poor. It has good performance at normal temperatures (20 ~ 30℃), but its performance will be significantly reduced at higher temperatures (above 80℃).

In view of the shortcomings of the existing technology, we aim to provide a liquid rubber-type temperature and pressure-sensitive adhesive and its preparation method, the pressure-sensitive adhesive still has good performance at high temperatures (more than 80℃).

In order to achieve the above purpose, the following technical solution is provided: composed of the following weight components: polymer: 30 ~ 50 viscosities: 0 ~ 40 plasticizer: 0 ~ 10 filler: 0 ~ 10 viscosity regulator: 0 ~ 10 antioxidant: 0 ~ 2 Vulcans: 0 ~ 2 solvents: 10 ~ 30; The polymer consists of the following weight components: liquid hydrogenated rubber: 30 ~ 50 parts of diol reagent: 10 ~ 30 parts of isocyanate reagent: 4 ~ 10 parts. As a further improvement: the diol reagent is: propylene glycol,2, 4-ethylenediamine -1, 6-diol,2, 5-dihydroxy-3-hexyne, 3-butene 1, 2-diol at least one.

/0 Comments

Water-dispersed acrylic pressure sensitive adhesive

Water-dispersed acrylate pressure-sensitive adhesive is made of butyl acrylate, 2-ethyl acrylate, ethyl acrylate, acrylic acid, initiator, viscosities, crosslinking agent, ammonia water, and other materials by reasonable preparation. Water dispersed acrylic pressure-sensitive adhesive is a new product of adhesive, its main characteristics are: easy to obtain raw materials, simple process, long storage period, easy to use, strong bond, water as a dispersion medium, does not use the emulsifier, but rely on the polymer itself emulsification, so as to avoid some shortcomings of emulsion polymer brought by an emulsifier. Mainly used for making pressure-sensitive tape.

The technical problem we need to solve is to overcome the defects of the existing technology, to provide a water-dispersed acrylic ester pressure-sensitive adhesive and its preparation method, it is easy to obtain raw materials, simple process, long storage period, convenient use, firm bond, water as the dispersion medium, do not use the emulsifier, but rely on polymer self-emulsification. Thus, some deficiencies of emulsion polymer brought by emulsifiers are avoided.

In order to solve the above problems, we can use the following technical solution: The following is a preparation method of water-dispersed acrylate pressure sensitive adhesive, the water-dispersed acrylate pressure sensitive adhesive prepared by the following weight ratio of raw materials: Butyl acrylate 72% ~ 75%, 2-ethyl ethyl acrylate 8.71% ~ 8.8%, ethyl acrylate 8.71% ~ 8.8%, acrylic acid 6.78% ~ 7%, initiator 0.1% ~ 0.7%, viscosifier 1.93% ~ 2%, crosslinking agent 0.58% ~ 0.65%, an appropriate amount of ammonia water.

The above is a water-dispersed acrylic pressure-sensitive adhesive of butyl acrylate, 2-ethyl acrylate, ethyl acrylate, acrylic acid, initiator, viscosities, crosslinking agent, ammonia water as the main component of the solid adhesive.

/0 Comments

Pressure sensitive adhesive tape is made of a special adhesive coated on the strip substrate

Pressure-sensitive adhesive tape is a special type of tape made by applying a special adhesive (pressure-sensitive adhesive) to the strip substrate. It is composed of pressure-sensitive adhesive, base material, base adhesive, and back treatment agent. Pressure-sensitive adhesive is the most important component of pressure-sensitive tape. Its function is to make the adhesive tape with pressure-sensitive adhesion characteristics. The main substrates are fabric, plastic film, paper, and so on.

pressure sensitive acrylate adhesive

The substrate is to increase the bonding strength of pressure-sensitive adhesive and substrate. When in use, gently apply pressure to bind the tape to the surface of the adhesive. In the manufacture of pressure-sensitive adhesive tape, special manufacturing equipment is needed.

However, the existing pressure-sensitive adhesive tape manufacturing equipment in the process of use, because the manufacturing process is greatly affected by the temperature, in a low-temperature environment, the adhesion of the pressure-sensitive adhesive molding will be reduced, which leads to the pressure-sensitive adhesive may fall off from the film paper in the manufacturing process, affecting the operation process and work efficiency; At the same time, when the device is working, the service life of the device may be affected because of a long time of working at low temperature, the device has no rest time.

Changsheng is a company dedicated to the research and development, production and sales of emulsion pressure sensitive adhesives. We can effectively solve the problems that customers encounter in the use of glue because of different production equipment and technology.

We specialize in the production of the protective film and pressure-sensitive adhesives for many years, with our own R&D team. In the future, through continuous research and development and summing up experience, our glue can be applied to more product application fields.

Low-E glass protective film usage-1

Our acrylic pressure-sensitive adhesive is widely used in the following aspects: the adhesion of different film materials (advantage: our coated adhesive has a strong peeling strength, suitable for coated BOPP, CPP, PET, PE, or other lightweight packaging film materials.) Protective film for household appliances (advantage: the series of adhesive peeling force increase small, do not leave residue, good anti-scalding performance) outdoor protective film (advantage: the series of glue has the advantages of temperature resistance (including high and low temperature), moisture-proof, waterproof performance excellent. They have different adhesive forces and can meet different bonding requirements.

Off-line Low-E Glass Protective Film 

Strength: It has the characteristics of strong stripping strength and moderate unwinding performance.

/0 Comments

High temperature resistant butyl pressure sensitive adhesive

3PE and heat-shrinkable belt repair structure is the first choice for the external anticorrosive coating of buried steel pipelines in China, which has been applied in China for nearly 20 years. With the passage of time, a considerable part of domestic oil and gas pipelines (including station yards) have entered middle and old age, and the corrosion protection layer of pipeline aging failure and the corrosion protection layer outside buried pipelines gradually increased. In recent years, more problems of 3PE corrosion protection layer stripping failure have been found, serious metal matrix and even corrosion, bringing hidden dangers to the safe and stable operation of pipeline oil and gas production.

Thermoplastic polypropylene or polyethylene cold-wrapped tape has general requirements for metal surface treatment and can be manually deducted, which is convenient for construction quality control. It is the most suitable material for field pipeline overhaul at present.

water-based acrylic structure pressure sensitive adhesive

Polyethylene cold wrap adhesive usually uses asphalt-modified butyl pressure-sensitive adhesive as the adhesive layer and polyethylene as the surface layer. However, under the influence of heat and other factors, polyethylene cold-wrapped tape is easy to wrinkle and sag. The heat resistance, soil stress resistance, and shear resistance of asphalt-modified butyl pressure-sensitive adhesive are poor, which seriously affects the anti-corrosion service life of the cold-wrapped tape.

The preparation method of the high-temperature resistant butyl pressure sensitive adhesive is characterized in that it includes the following steps: 1) the butyl rubber, 7-100,000 molecular weight polyisobutene, and filler are put into the double roll open mixer for mixing, mixing evenly, the birth film; 2)

Add the viscosifying resin and SEBS into the kneader and stir, and gradually heat to 140-150℃, the viscosifying resin and SEBS melt and mix evenly, to obtain the mixture A; 3) Add 30,000-60,000 molecular weight polyisobutene to the mixture A obtained in step 2), further melt and stir at 140-150℃ to obtain mixture B; 4) To the mixture B obtained in step 3), add the mixed raw film of step 1) and the antioxidant in turn, stirring at 140-150℃ for 1 hour to obtain high-temperature butyl pressure-sensitive adhesive.

/0 Comments