Special pressure sensitive adhesive

As a kind of adhesive material, tape has its special application, such as fixed bonding of materials, surface protection and so on. Nowadays, with the upgrading of the electronic industry is getting faster and faster, the requirements for electronic adhesive tape are getting higher and higher.

PE protective film for glass usage

More electronic applications have put forward the tape not only needs high bonding strength, but also requires strong bonding of different surface energy materials. There are further requirements such as living reagent resistance, such as laundry detergent, sweat, alcohol, food grease and so on. These properties are precisely what most ordinary tape cannot achieve. Some high bonding strength tape has appeared on the market, such as 3M VHB tape, the foam tape is mainly composed of intermediate foam structural layer and two sides coated with high, medium and low surface energy type of high strength acrylic pressure sensitive adhesive, acrylic pressure sensitive adhesive provides high bonding strength, the intermediate foam layer provides stress dispersion, can bond different surface energy materials, and bond more firmly.

Also such as AB double-sided adhesive on the market, by using different surface energy adhesives on both sides of the PET film substrate coating, can bond low and medium surface energy plastic and high surface energy metal plate. As mentioned above, there are high bonding strength tapes on the market that can bond different surface energy materials, such as VHB foam tape produced by 3M.

This tape has high bonding strength and good stress dispersion, but it is not able to withstand living reagents. Another example is the high bonding strength AB tape, which can also be well bonded to different surface energy materials, but the same resistance to living reagents is poor, and the stress of the tape is easy to concentrate, resulting in a decline in bonding durability. Therefore, it is necessary to seek a special pressure sensitive adhesive composition and adhesive tape with high bond strength, good resistance to living reagents, and suitable for ultra-thin bonding occasions.

As a professional acrylic pressure sensitive adhesive supplier, Smprotectivefilm is committed to solving the glue problems encountered by customers due to different production equipment and processes.

Compared with traditional solvent-based pressure sensitive adhesive, our emulsion pressure sensitive adhesive has the advantages of environmental protection, safety and easy operation. Using deionized water instead of traditional solvent reduces the pollution to the environment and is an ideal environmental protection product.

By adjusting the proportion of curing agent, pressure sensitive adhesive with different adhesive force can be obtained to meet the needs of different applications. Suitable for a variety of materials, transparent after drying.

/0 Comments

Production problems of foam pressure sensitive tape

Many enterprises at home and abroad began to try to develop better foam tape. For example, by adjusting the manufacturing process of foam, the foam with closed cell structure was produced. The foam tape produced by using this as the base material could reduce the intrusion of water vapor and dust. Or introduce some oligomers to improve the surface energy in the manufacture of polyurethane foam, so as to improve the surface energy of the foam, so as to reduce the cost of pretreatment when the foam is transferred to pressure sensitive adhesive layer. Although these two methods can improve the performance of foam tape, the closed cell structure of the former is only suitable for the application of large size devices.

Low-E glass protective film

Once the closed cell structure of small size devices is damaged in the die cutting process, there will still be a full pass situation. While the latter can only slightly improve the surface energy of foam, the manufacture of high viscosity foam tape still needs to be pretreatment. 3M adopted the solution of core material of viscoelastic body with very low crosslinked density and surface layer of viscoelastic body with high crosslinked density. By taking advantage of the high loss factor characteristic of core material under high-frequency shear, the external impact was converted into mechanical relaxation of core material, and in this way, the buffering performance similar to foam tape was obtained.

However, the buffering performance of this scheme is worse than that of the foam base material tape, which still needs the foam structure to reinforce. Prior art reports that expandable polymer microspheres are used in adhesives to obtain pressure sensitive film material by extrusion of die head, which is then laminated with the liner to form adhesive tape.

This method has the following drawbacks: (1) it is not possible to produce pressure sensitive adhesive tape with thinner thickness (less than 200 microns), so it is difficult to apply in ultra-thin Spaces; (2) Expandable polymer microspheres are only partially expanded before the adhesive composition is discharged from the die head, and can still continue to expand after being heated. In the bonding of electronic devices, there is a risk of device damage due to continued expansion; (3) The shell of the polymer microsphere is fixed after expansion.

The elasticity/compressibility of the eventually formed pressure-sensitive film material is limited by the mechanical strength of the microsphere shell. The elasticity of the microsphere needs to be changed by adjusting the material and thickness of the shell. (4) The production process of expandable polymer microspheres is complicated, the shell material has high mechanical strength, and needs high temperature above 100℃ to achieve expansion; (5) Using melt extrusion process manufacturing, feeding equipment is huge and complex, need more than 100℃ high temperature to achieve polymer microsphere expansion, high energy consumption, the process is more complicated. The aforementioned pressure-sensitive film is not suitable for today’s light and thin smart electronic products.

/0 Comments

Elastic pressure sensitive tape

With all kinds of intelligent electronic products against falling, deformation resistance, waterproof and dust requirements are more and more stringent, hardware manufacturers urgently need high-performance cushioning and energy-absorbing materials to achieve the above functions. At present, most of the pressure sensitive tape with buffering properties on the market is foam tape.

black & white PE films

Foam tape is a kind of tape product made of foam as the base material. This tape is thicker than ordinary tape and has better sealing and damping effect. It can be used in a variety of occasions. Common foam materials are polyolefin or polyurethane foam materials. The polyolefin or polyurethane is heated and shear to high temperature melting state through screw machine and other equipment, and then blended with the electron beam excited foaming agent.

After extrusion molding, irradiation foaming, cutting shaping and other processes, the final strip foam manufacturing is completed. Foam tape is generally coated with pressure-sensitive glue on the release film, and then bonded to the foam after curing.

Due to the characteristics of the foam strip used, this kind of foam tape often has some inherent shortcomings in manufacturing and application: (1) Because the foam material is made of polyolefin or polyurethane material, which has poor heat resistance, there will be different degrees of shrinkage, camping and other deformation at 80℃ when there is no sufficient external tension support, which leads to the foam strip can not go through the high temperature process, which means that the foam tape can not be made by directly coating the foam surface with glue: Solvent-based glue needs high temperature to remove solvent and curing, UV glue in the long time UV curing process will also produce high temperature, both will lead to foam deformation, so only by the pressure sensitive glue coated on the release film and then fitted to the foam method to manufacture foam tape.

The surface energy of the foam is mostly below 32 dyns, which leads to the manufacturing of the foam tape, it is necessary to improve the surface energy of the foam by corona, pre-coated adhesion enhancer and other methods, in order to ensure that the pressure sensitive adhesive layer can be and the surface of the foam after bonding strength is enough, the process is complex, high manufacturing cost. (2) Before the foam tape is assembled into the intelligent electronic products, it is necessary to process buffer devices of various shapes through die cutting process. In the die cutting process, polyolefin or polyurethane itself is brittle and prone to dust, and electronic products have a high requirement on cleanliness, which makes it necessary to always pay attention to whether the devices with foam tape produce dust. Increased the cost of quality. (3) The bubble structure formed in the foaming process of foam, once destroyed in the die-cutting process, there will be a permanent open structure, which leads to water vapor, dust is very easy to invade from these open structures inside the foam, and along the porous structure inside the foam through the foam, As a result, many precision devices with strict limits on water vapor and dust need to increase the sealing structure to avoid pollution, increasing the cost of structure.

/0 Comments

Bio-based polyurethane pressure sensitive adhesive

Pressure-sensitive adhesiveness is the property of the material to achieve permanent bonding to the substrate even under relatively weak application pressure. A substance with this property is called a pressure sensitive adhesive (PSA). Pressure sensitive adhesives have long been known. Usually, they can be re-separated (stripped) from the substrate with little residue after use.

Chemical flame retardants

Typically, pressure-sensitive adhesives are permanently inherently viscous at room temperature and therefore have a certain viscosity and adhesiveness, so they wet the surface of the corresponding substrate even at low application pressure. The ability of pressure sensitive adhesives to adhere to materials and transfer force comes from the adhesion and cohesion of pressure sensitive adhesives. Efforts have been made over the years to manufacture plastics based on renewable raw materials due to environmental factors and sustainable development, and against the background of the increasing scarcity of crude oil resources and, on the other hand, the dramatic increase in plastics consumption worldwide.

This is particularly true for biodegradable polymers, which are used for packaging applications or membrane applications. Also for medical applications, biodegradable products are playing an increasingly important role. As environmental factors related to biodegradability are playing an increasingly important role (for pressure-sensitive tapes), the use of biodegradable membranes as support materials for pressure-sensitive tapes has been proposed in the past. However, the existing polyurethane pressure sensitive adhesive is mainly composed of polyether polyols or polyester polyols, which takes a long time to completely degrade in the environment and is not easy to be coated on degradable carrier materials.

As a professional acrylic pressure sensitive adhesive supplier, Smprotectivefilm is committed to solving the glue problems encountered by customers due to different production equipment and processes.

Compared with traditional solvent-based pressure sensitive adhesive, our emulsion pressure sensitive adhesive has the advantages of environmental protection, safety and easy operation. Using deionized water instead of traditional solvent reduces the pollution to the environment and is an ideal environmental protection product.

By adjusting the proportion of curing agent, pressure sensitive adhesive with different adhesive force can be obtained to meet the needs of different applications. Suitable for a variety of materials, transparent after drying.

/0 Comments

High temperature resistant pressure sensitive adhesive

With the official arrival of 5G era, the mobile phone industry will usher in a new round of changes. With the gradual phasing out of metal back covers, 3D glass and ceramic costs are too high, and traditional plastic cannot meet the requirements of the market for the appearance of mobile phones, as well as the increasingly fierce competition in the middle and low-end market.

pressure sensitive adhesives

These factors will promote the innovation of mobile phone cover plate in the use of materials. At present, composite plate mobile phone cover plate has become a new research hotspot. Through the ultra-high pressure gas molding machine, coupled with the current plastic texture technology, the visual aspect is enough to meet the appearance requirements, while fully meeting the radio frequency requirements of 5G communication signals. Composite materials (such as PC+PMMA) have become a new solution to replace the traditional metal back cover with ceramic and glass.

PC/PMMA composite material is PC and PMMA through the co-extrusion method, because PMMA has good hardness and wear resistance, generally used for external, and PC has good toughness, so as the inner layer. And PC/PMMA composite has the advantages of both PC and PMMA, low cost, efficient product form, with better surface hardness. It can withstand strong impact and has the appearance and texture of glass and metal. It can be formed into 2.5D /3D and meet the demand of wireless charging shield.

Therefore, PC/ PMMA composite material is the preferred material for smart phones in the next few years. PC/PMMA composite plate, not only meet the requirements of rigidity and decoration, but also meet the needs of wireless charging without shielding, PMMA provides higher hardness and weather resistance, PC impact performance and molding performance is good, the two materials after co-extrusion greatly expanded the new application of the battery cover. Therefore, it can be seen that PC/PMMA composite material is the preferred material for smart phones in the next few years. It is mainly to develop pressure sensitive adhesive for the high temperature resistant functional film required in the hot pressing process of composite plate.

Smprotectivefilm has released a new product, FR-921, featuring high solid content and improved coating speed for customers. This product is mainly used for frozen packaging labels.

FR-921 is a high viscosity pressure-sensitive adhesive based on the latest polymerization process and designed with various special monomers. It has good leveling property, high peeling strength, high initial adhesion and high solid content.

Moreover, this product is also an ideal environment-friendly product, with clear film formation, transparency and good weather resistance. It has excellent bonding performance on paper, metal, plastic (such as ABS, PVC, PC, FET, PMMA, etc.) and other materials, especially difficult to stick substrates. Widely used in high-end products in the field of self-adhesive, suitable for all kinds of tape production, to meet the requirements of high-speed coating.

/0 Comments

Crosslinked pressure sensitive adhesive with high holding strength

Acrylic polymers have excellent light resistance and transparency, and depending on the combination of raw materials used to synthesize the polymer, acrylic polymers can be given functions suitable for a variety of applications. Therefore, acrylic polymers are preferred to be used in the pressure sensitive adhesive layer of a high holding strength crosslinked pressure sensitive adhesive. For example, the following thermoplastic acrylic pressure-sensitive adhesives have been proposed.

Water-based adhesive

Pressure-sensitive adhesives are obtained by the precise polymerization of block copolymers of acrylates as soft segments and methacrylate as hard segments by active polymerization, and have excellent properties in various aspects such as heat resistance, weather resistance, flexibility, transparency and pressure-sensitive adhesion. A pressure sensitive adhesive sheet can be prepared by co-extrusion using a thermoplastic acrylic pressure sensitive adhesive because the pressure sensitive adhesive is thermoplastic.

According to co-extrusion molding, the sheet can be produced in one step because the backing layer and the pressure sensitive adhesive layer are extruded at the same time to laminate. Therefore, the production cost can be reduced and the production process simplified. In addition, co-extrusion molding has the following advantages. Solvents such as organic solvents are not used, so drying steps are not required and environmental load is low. On the other hand, when the acrylic pressure sensitive adhesive is prepared by co-extrusion, the following problems occur.

Since the production is done in one step, the surface of the material forming the backing layer (the back lining) cannot be pretreated. Typically, when a backing made of a non-polar material such as polyethylene or polypropylene has a highly polar acrylic type pressure sensitive adhesive layer, their electrostatic interaction is weak, so the adhesion between the backing and the pressure – the sensitive adhesive layer is low. Thus, the adhesion between the backing layer and the pressure sensitive adhesive layer is improved by subjecting the surface of the backplane to pretreatments such as corona treatment and plasma treatment. Pre-uv light irradiation or electron beam irradiation treatment. However, co-extrusion molding precludes this pretreatment.

As a professional acrylic pressure sensitive adhesive supplier, Smprotectivefilm is committed to solving the glue problems encountered by customers due to different production equipment and processes.

Compared with traditional solvent-based pressure sensitive adhesive, our emulsion pressure sensitive adhesive has the advantages of environmental protection, safety and easy operation. Using deionized water instead of traditional solvent reduces the pollution to the environment and is an ideal environmental protection product.

By adjusting the proportion of curing agent, pressure sensitive adhesive with different adhesive force can be obtained to meet the needs of different applications. Suitable for a variety of materials, transparent after drying.

/0 Comments

Viscosity reducing pressure sensitive adhesive

Pressure sensitive adhesive, is short for pressure sensitive adhesive, is a kind of adhesive with pressure sensitive, mainly used for the preparation of pressure sensitive adhesive tape, general pressure sensitive adhesive peeling force (adhesive tape and adhesive surface after the peeling force)< adhesive cohesion (pressure sensitive adhesive molecules between the force)< adhesive base force (adhesive and substrate adhesion).

Such a pressure sensitive adhesive in the process of use will not have the phenomenon of degumming, pressure sensitive adhesive according to the main resin composition can be divided into rubber type and resin type two categories, rubber type can be divided into natural rubber and synthetic rubber, resin type and mainly includes acrylic acid, silicone and polyurethane, rubber pressure sensitive adhesive in addition to the main component of rubber, Other auxiliary ingredients are added. China Patent Network has published a preparation method of U V pressure-sensitive adhesive with adjustable stripping force, the publication number is CN108864957A.

Through process adjustment, the patent controls the molecular weight and molecular weight distribution, realizing the adjustment of stripping force through the dosage of curing agent, wide stripping force adjustment range, high maximum stripping force. It can easily and quickly meet the market demand of different peeling forces, and the viscosity reduction method is relatively simple, which cannot meet the viscosity reduction needs of pressure sensitive adhesives with different uses. The range of use has certain limitations. China Patent Network also discloses a heating viscosity reduction protective film processed by heating viscosity reduction adhesives.

The patent adds self-expanding microsphere foaming agent and OBSH foaming agent to the heating viscosity reducing adhesive layer material. OBSH foaming agent has small heat release, which is conducive to controlling the closed cell foaming of thick layer PVC and does not cause the central coking due to the accumulation of heat, so as to reduce the viscosity of the substrate surface after heating, and facilitate the removal of the protective film after heating. However, the patent only uses heating to reduce the viscosity of pressure-sensitive adhesive, which is relatively simple.

Smprotectivefilm is also committed to the emulsion pressure sensitive adhesive research and development, production, sales of the company. 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 protective film and pressure sensitive adhesive 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.

/0 Comments

Antistatic polyacrylate pressure sensitive adhesive

With the rapid development of electronic technology such as mobile phone, computer and touch display, the integration of electronic materials is becoming higher and higher, microelectronics is becoming more and more precise, more and more electrostatic sensitivity, such as field effect transistor, chip, large-scale integrated circuit and touch screen are more and more sensitive to the harm caused by static electricity.

adhesive

In the process of processing and use of these electronic materials, it is required to choose the antistatic protective film with surface resistivity below 1010Ω/□ in low humidity environment and with long-lasting antistatic effect. Therefore, it is necessary to develop the pressure sensitive adhesive with good antistatic effect to prepare the antistatic protective film to derive the static electricity generated during the processing of electronic materials.

In order to avoid the electrostatic accumulation during the process of electronic materials to produce harm. Conventional antistatic agents such as carbon black or graphite, added to the pressure sensitive adhesive made of antistatic protection film color is dark or black, is not conducive to visual observation and analysis detection, and affect the appearance. The antistatic protective film made by adding metal powder to the pressure sensitive adhesive has the phenomenon that the film surface is not smooth and even damages the electronic components. At the same time, the transparency is poor and affects the observation.

The use of conductive polymers such as polythiapol and polyaniline has the problem of poor compatibility with pressure-sensitive adhesive, which causes the peel strength of pressure-sensitive adhesive to fluctuate greatly, resulting in degumming, adhesive layer transfer and serious spot and other phenomena. It is necessary to apply a separate layer of antistatic coating, and then apply the pressure sensitive adhesive again. The antistatic effect is significantly weakened. Increased production costs.

Patent CN201310654380.6 discloses an anti-static voltage sensitive adhesive protective film and its preparation method. The method adopts the synergistic compounding of electrolyte based polymer conductive substance and nanomaterials to achieve conductive effect, and achieves the maximum anti-static effect with a small additive amount, without affecting the peeling force of the protective film itself and no residual adhesive after peeling. However, this method uses expensive nano silver wire and nano copper wire, high cost and limited source of raw materials, so it is not suitable for widespread application.

Patent CN201510610771.7 discloses an antistatic pressure sensitive adhesive and its preparation method, which uses LiAsF6 to form ionic conducting polymer by complexing with polyurethane macromolecular chains synthesized by the reaction of polyoxyethylene polyol, polyoxyel polyol and polytetrahydrofuran polyol with isocyanate. This kind of ionic conductive polymer structure has poor compatibility with oil-based acrylic resin, and the protective film made is not transparent at low temperature due to the difference in crystallization temperature of the pressure sensitive adhesive layer.

Smprotectivefilm is also committed to the emulsion pressure sensitive adhesive research and development, production, sales of the company. 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 protective film and pressure sensitive adhesive 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.

/0 Comments

Sanitary ware toughened glass safety film using acrylic pressure sensitive adhesive

Toughened glass is a kind of safety glass that forms a compressive stress layer on the surface of the flat glass after being treated by heating – quenching or other methods to improve the mechanical strength and heat shock strength of glass, and forms small granular fragments without acute angles to reduce the risk of injury when it is damaged. Toughened glass because of its advantages, is often used in home decoration block doors, bathroom large shower room,s and other places.

Low-E glass protective film usage-1

But its obvious disadvantage is that toughened glass will happen in the absence of direct external mechanical forces under the action of the automaticity of the crack, namely the explosive of toughened glass, according to the experience of the industry, common the explosive rate of toughened glass in 1- around 3%. Self-detonation is one of the inherent characteristics of toughened glass.

So far, the scientific community has not been able to solve the self-detonation characteristics, and as a bathroom, in the process of use due to the alternations of hot and cold water and dry humidity, coupled with the deformation of the processing process and other reasons, so that the self-detonation rate of tempered glass significantly increased, has greatly affected the personal safety of users, at present, safety film program because of its easy processing, low cost.

It is widely used in home decoration, especially in sanitary ware. By sticking the safety film with toughened glass, the glass will be stuck by adhesive after breaking, which protects the person from self-explosion injury; but at present, the biggest problem with sanitary safety film is that dry paste glue, high temperature and humidity resistance, long time use will appear bubbles, water ripples and other phenomena, affecting the appearance. The main reason for these problems is that the adhesive performance of the safety film used is not up to standard. Therefore, it is of great application value and market value to study acrylic acid pressure sensitive adhesive with high viscosity, high temperature and high humidity resistance and no orange peel lines.

/0 Comments

Modified acrylic emulsion pressure sensitive adhesive

Emulsion pressure-sensitive adhesive has many advantages such as a simple synthesis process, no pollution, low VOC content, and low cost, so its market prospect is broader and broader. However, the common emulsion pressure-sensitive adhesive still has some shortcomings, such as a weak balance of adhesion/peeling strength, poor water resistance, and durability, so it is difficult to meet the requirements of high-end pressure-sensitive adhesive fields.

adhesive factory

In order to improve the properties of pressure-sensitive adhesive, the high-performance pressure-sensitive adhesive emulsion can be prepared by modifying adhesive resin, reactive emulsifier, and nanoparticle. Among many modification studies, there are relatively more reports on the modification of viscosified resin, but there are some problems such as the change of emulsion properties and the decrease of adhesion caused by viscosified resin. In addition, crosslinking modification is one of the most effective methods to improve the properties of emulsion pressure sensitive adhesive.

By introducing functional monomers with cross-linked groups in the emulsion preparation process, the cross-linking reaction occurs during film formation to form a three-dimensional network structure. At present, the crosslinking systems commonly used for emulsion pressure-sensitive adhesives include epoxy resin, ketone carbonyl group, acrylamide and so on.

Recently, acetoacetyl group, as a new reactible active group, can react with metals, amines, isocyanates, active alkenes and aldehydes. The main monomer containing acetoacetyl group is acetoxy-ethyl methacrylate (AAEM), which is relatively low toxicity and has attracted wide attention in the field of crosslinking modified emulsion. Using AAEM as modified functional monomer and aziridine as curing agent, Zhang Yubo et al. prepared two-component water-based acrylate coatings and applied them in the field of coatings.

Lei Liang et al. modified acrylic ester with AAEM and synthesized polymer emulsion with 10% hexamethylene diamine solution as curing agent, and discussed the influence of different AAEM dosage on the properties of the film. Wang Xiaorong et al. synthesized room temperature self-crosslinking acrylate emulsion with AAEM as functional monomer and diacylhydrazine carbonate as crosslinking agent, and prepared water-based varnish. However, the application of AAEM functional monomer modified acrylate emulsion to pressure sensitive adhesive is rarely reported.

/0 Comments