Peeling power of pressure sensitive adhesive

Pressure sensitive adhesive, as the name implies, is a pressure sensitive adhesive, it is a kind of adhesive without the aid of a solvent, heat, or other means, only needs to apply mild pressure, and can be firmly bonded with the adhesive. Pressure-sensitive adhesive is characterized by easy adhesion, uncovering is not difficult, stripping is not damaged, and the adhesive layer will not dry up over a long time, so the pressure-sensitive adhesive is also known as self-adhesive.

adhesive

It is because of the above characteristics of pressure sensitive adhesive, pressure sensitive adhesive products have a very wide range of uses. Acrylate pressure-sensitive adhesive is the most widely used pressure-sensitive adhesive at present, it is the copolymer of an acrylate monomer and another ethylene monomer.

Acrylate pressure-sensitive adhesive mainly includes solvent pressure-sensitive adhesive and emulsion pressure-sensitive adhesive. Among them, solvent-based pressure-sensitive adhesive has been widely used in many fields, and their dosage accounts for more than 65% of the whole pressure-sensitive adhesive.

Especially in the past two decades, this kind of pressure-sensitive adhesive has developed very rapidly and gradually replaced the position of natural rubber pressure-sensitive adhesive. Widely used in packaging, coating, transportation, electronic communications, electrical appliances, building materials, machinery, aerospace, light industry, medical, family life, and many other fields.

However, the current use of pressure-sensitive adhesive still has the following problems: 1. The peeling force and adhesion of pressure-sensitive adhesive are not high enough, and the bond firmness is not enough;2. The pressure-sensitive adhesive has poor plasticizer resistance and temperature resistance; 3, the synthesis of pressure-sensitive adhesive using benzene, toluene, and other solvents, high toxicity, and no environmental protection, limits its use.

Smprotectivefilm is also committed to the emulsion pressure-sensitive adhesive research and development, production, and 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 the 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.

Our acrylic pressure-sensitive adhesive is widely used in:

  • Fit of different film materials

Hot item: Glue FR-201

Advantages: Our laminating adhesive has strong peeling strength, suitable for laminating BOPP, CPP, PET, PE or other lightweight packaging film materials.

  • Protective film for household appliances

Hot stuff: Glue FR-07; Glue FR-102-2

Advantages: The series of adhesive peeling force increase small, does not leave residue, good anti-scalding performance.

The FR-07 is suitable for smooth surfaces of stainless steel, and the FR-102-2 is suitable for slightly rough surfaces.

  • Outdoor protective film

Hot stuff: Glue FR-04; Glue FR-W78-1; Glue FR-091-6

Advantages: This series of glue has the advantages of temperature resistance (including high and low temperature), moisture-proof, and waterproof performance. Their adhesive force is different and can meet different bonding requirements.

Glue FR-091-6 is especially suitable for carpets, fluorocarbon spray aluminum profiles, and another rough surface.

  • Off-line Low-E glass protective film

Hot item: FR-08-J7

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

/0 Comments

Pressure sensitive adhesive for paper tape

Beauty strip paper tape in footwear, furniture, cars, home decoration, and other fields is widely used, the traditional beauty strip paper tape uses acrylic or silicone-modified acrylic acid, the advantage is low cost, but the disadvantages are also very significant, adhesion time is too long will produce degumming, migration, bonding drawing, and some need a higher temperature environment, acrylic can not meet the requirements.

flame retardant

At present, there are two categories of paper tape, one is acrylic as the bonding layer, one is silicone pressure-sensitive adhesive as the bonding layer, acrylic acid has a certain impact on the environment, and acrylic acid is not resistant to high and low temperatures, corrosion resistance and corrosion of copper, aluminum, silver, etc. (carboxyl, organic acid), smell bad. Because of the use of organic acids, they may attract insect bites. In some humid environments, the tape is not easy to use and store.

Silicone pressure-sensitive adhesive is inert and has high and low-temperature resistance, chemical corrosion resistance, good insulation performance, and excellent atmospheric aging resistance so it is widely used in the manufacturing of adhesive tape. Silicone tape is a big line in the field of adhesive tape. However, the high price of organosilicon will produce ghost, easy-to-form wire drawings when bonding, which is the problem faced in the practical application of such products.

Although silicone pressure-sensitive adhesive can solve these problems in a full range, due to the high permeability of the paper, unlike polyester, a polyimide film is flat, convex, and convex strong, resulting in glue permeability is particularly strong, on the one hand, it is easy to degum, ghost, made into tape softness is poor, when winding will collapse and spread, broken tape problems, need to be anti-penetration treatment, In the absence of anti-penetration treatment is easy to degum, ghosting. So the beauty paper as a protective film is very limited. But the paper can be reused, can save resources, and does not pollute the environment.

/0 Comments

Causes of difficulty in peeling acrylic pressure sensitive adhesive and residual glue in the peeling process

The acrylic pressure-sensitive adhesive has no need to add antioxidants, has good bonding strength, good transparency, medium resistance and no phase separation and migration, and other excellent properties, is the most widely used pressure-sensitive adhesive in the market. However, the existing acrylic pressure-sensitive adhesive on the market in the actual use of the process, such as the pressure-sensitive adhesive bonded on the surface of the bonded material, generally after a period time to uncover, short only a few minutes, and long in more than 1 year with the increase of the use of time, pressure sensitive adhesive often peeling difficulties and peeling process is very easy to appear residual glue problems, Strong stripping will lead to the destruction of the surface of the bonded material, and the residual pressure sensitive adhesive on the surface of the bonded material after stripping can not be easily removed, which not only seriously affects the aesthetic appearance of the surface of the material, but also leads to the pollution of the bonded material.

Research shows that acrylic pressure-sensitive adhesive stripping difficulties and stripping in the process of residual glue for the following three reasons, one of the most common is the peeling strength of pressure-sensitive adhesive after a period of time has changed, after bonding in the surface of the bonded material, generally after a period of time to uncover, short only a few minutes, and long in more than 1 year, in this period of time, The peeling strength of pressure sensitive adhesive tends to increase with the continuation of time, usually first fast and then slow, and finally stable. When the peel strength rises to exceed the cohesive strength or adhesive base force, cohesive failure or adhesive base failure will occur, resulting in residual glue. Another reason is the aging of pressure-sensitive adhesives.

Pressure-sensitive adhesive belongs to the polymer. After being subjected to heat or long-time ultraviolet irradiation, the macromolecular chain of pressure-sensitive adhesive breaks, the average molecular weight decreases, the cohesion strength decreases, and then cohesion failure occurs. In addition, compatibility with the surface material of the bonded material is also an important factor causing residual glue. With the passage of time, the surface of the pressure-sensitive adhesive and the bonded material gradually fused with each other due to the compatibility phenomenon, causing the peeling strength to rise, resulting in cohesive failure or adhesive base failure; Or some small molecules in the pressure sensitive adhesive layer are compatible with the protected surface, so as to migrate from the pressure sensitive adhesive to the protected surface, resulting in migration residue.

Acrylic pressure-sensitive adhesive supplier

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 pollution to the environment and is an ideal environmental protection product.

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

/0 Comments

Acrylic pressure sensitive adhesive for PU foam

PU foam double-sided tape not only has excellent sealing performance, water resistance, good hardness, good toughness, but also has the advantages of heat preservation, heat insulation, sound absorption, shock absorption, flame retardant, anti-static, good air permeability, so it has a good application prospect in household appliances, instruments, automobile industry, battery industry, and other fields. The surface of PU foam is smooth, and PU foam contains low molecular surfactants that are easy to migrate.

Composition of pressure sensitive adhesive

The general pressure-sensitive adhesive has poor adhesion to the surface of PU foam. The adhesive tape directly coated with glue is easy to residue when used. Patent CN102977804A proposed a kind of double-sided foam tape and production process, but the patent only through the corona process, the obtained double-sided foam tape viscosity and comprehensive performance are general and easy to use glue. Patent CN106978098A proposed the process of bottom coating PU foam to improve the binding force of pressure-sensitive agents on PU foam. To solve the above problems, we have made a series of improvements.

An acrylic pressure-sensitive adhesive for PU foam and a preparation method thereof are provided to overcome the above shortcomings and deficiencies of the prior art. An acrylic pressure-sensitive adhesive used for PU foam is characterized in that the acrylic pressure sensitive adhesive is an acrylic ester polymer, including Isooctyl acrylate, methyl acrylate, acrylic acid, glycidyl acrylate, azobisisobutyronitrile, ethyl acetate, the crosslinking agent of the acrylate polymer is titanate crosslinking agent, the titanate crosslinking agent mass number is 0.01 ~ 1.

The mass of each component of the acrylic pressure-sensitive adhesive is isooctyl acrylate 45 ~ 60 methyl acrylate 25 ~ 35 acrylic acids 1 ~ 8 glycidyl acrylate 0.1 ~ 3 azobisisobutyronitrile 0.2 ethyl acetate 150. Further, the mass number of each component of the acrylate polymer is as follows: 60 parts of is octyl acrylate, 35 parts of methyl acrylate, 5 parts of glycidyl acrylate, 0.2 parts of diisobutyronitrile, 0.2 parts of ethyl acetate, 150 parts.

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 pollution to the environment and is an ideal environmental protection product.

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

/0 Comments

Silicone pressure sensitive adhesive

Pressure-sensitive adhesives are prepared by combining silicone elastomer materials with viscosifying resins, including silicone viscosifying resins.

Such as US patents 5,237,082(Leir et al.),5,264,278(Mazurek et al.),5,264,278(Mazurek et al.),5,314,748(Mazurek et al.), and 5,514 ,730(Mazurek et al.). Silicone elastomer materials in pressure-sensitive adhesives have been prepared by polymerizing silicone compounds with end-alene unsaturated groups using actinic radiation (e.g., ultraviolet radiation) in the presence of a conventional Norrish type 1 photoinitiator.

Advantageously, polymerization can occur in the absence of an organic solvent and/or in the presence of a thermal material such as a thermal substrate. Active controlled radical polymerization methods have been developed that allow the preparation of polymers with well-defined molecular weight, polydispersity, topology, composition, and microstructure.

These methods are based on the use of special polymerization media that temporarily and reversibly convert growing radicals into dormant and/or stable species. Reversible transformation is usually achieved by reversible inactivation or by reversible chain transfer.

Involves living controlled radical polymerization by reversible conversion of some methods including the cause transfer termination agent (inverter) method, the nitrogen-oxygen free radicals (nitroxide mediated polymerization (NMP), atom transfer polymerization (ATRP), and reversible addition-fracture (RAFT) method. The terms “initiated transfer terminator” and “photoinitiated transfer terminator” refer to molecules that may act as initiators, transfer agents, and terminators. In Otsu et al., Macromol.Chem., Rapid Commun. , 3127-132 (1982), discusses the various causes of termination agents. Compounds to double xylene (N, N-diethyl dithiocarbamate ester) (XDC) is used to form a variety of block copolymer based on acrylic acids, such as European patent application 0286376 A2 (such as Otsu) and 0349270 A2 (Mahfuza et al) in those described.

/0 Comments

Resin sheet with pressure sensitive adhesive layer

In electronic devices such as thin televisions, personal computers, mobile phones, or portable game consoles, the heat generated by heating components such as electronic components increases and has to be removed as the output of LEDs as light sources increase or cpus become highly integrated.

water-based pressure sensitive adhesive

To this end, for example, the following methods have been used. The thermal conductor is arranged in the space between the heating part and the housing so that the heating part and the housing are integrated with each other. The heat generated by the heating part is transmitted to the housing using a hot conductor, and from the housing to the outside, thus cooling the heating part. Inorganic material sheets with high thermal conductivity, such as graphite sheets, have been frequently used as thermal conductors.

However, when using inorganic material sheets with high thermal conductivity, such as graphite sheets, the temperature of one part of the shell often becomes very high. In fact, when a person touches the shell with his or her hand, the temperature often reaches a level that makes the person uncomfortable. For example, temperature makes people feel at risk of burning. In particular, such high temperatures impede the operation of electronic devices that are individually portable, such as mobile phones.

Usually, the heating parts and the housing have their own concave and convex parts. In this case, the space between the heating parts and the housing has a complex shape due to their convex and convex parts. For example, the space has large parts and small parts. In this case, when the heat conductor is arranged in accordance with a small part of the space, a gap appears in the thick part of the space, making it difficult to conduct heat in that part. In contrast, when the heat conductor is arranged in accordance with the large part of the space, the housing and heating components cannot be integrated and fixed with each other in the thin part of the space.

In this case, large forces are required to store sheets of inorganic materials with high thermal conductivity, such as graphite sheets, in thin sections of the space. When a large force is applied, the shell, which often includes plastics, etc., cannot withstand the stress caused by the force and will crack or crack.

For such reasons as mentioned above, as in the past, when inorganic material sheets with high thermal conductivity, such as graphite sheets, are used as thermal conductors, the heating parts, the heat conductors and the housing do not contact each other in an integrated manner, but the heating parts, the heat conductors and the housing partly contact each other and heat removal is carried out only in the contact parts. A condition in which the temperature of a part of the shell becomes very high. In addition, when the heating component, the heat conductor, and the shell are only partially in contact with each other, the high heat conduction characteristics of the heat conductor cannot be fully demonstrated.

/0 Comments

Dispersant acrylic resin adhesive

Compared with the previous solvent-based resin, the water-dispersed resin can reduce the number of organic solvents contained so as an environmentally friendly resin, can be used for a variety of water-based coatings such as vehicles, plastic forming products, household appliances, steel products, large buildings, aircraft, building materials, construction, tile, woodworking, and other water-based coatings, in addition, It can also be used for adhesive, resist, printing ink and other purposes. In these areas, automotive decoration and automotive repair with transparent (clear top) finish paint and another automotive paint field, require a good appearance at the same time, but also require full stability and excellent film physical properties, especially high water resistance, and then with the improvement of environmental awareness in recent years, In order to achieve low VOC(volatile organic compounds) chemistry, it is urgently needed to reduce the organic solvent content sufficiently.

water-based acrylic structure pressure sensitive adhesive

For the previous water-dispersed resins, a water-dispersed resin composition was disclosed in Bulletin No. 6-49367, which was obtained by neutralizing the resin mixture with alkali and then conducting water dispersion. The resin mixture consists of two acrylic resins with an antelope base and a light base as well as a non-water-soluble compound or resin with functional groups that can react with these groups. In addition, a water-based coating composition is disclosed in Bulletin No. 11-131017, which is a composition consisting of a light base polyol and a terminated polyisocyanate crosslinker. In addition, a water-based adhesive dispersion containing at least one copolymer having a gazelle group and/or gazelle group is disclosed in Bulletin No. 2004-162030 in the form of at least part of the gazelle group neutralized by triethanolamine. In addition, a water-based two-component PU(polyurethane) coating material containing a specifically modified vinyl polymer polyol dispersion and polyisocyanate is disclosed in Bulletin No. Table 2004-527588.

However, substances represented by these resin compositions coexist with isocyanate compounds in order to prevent the reaction of neutralizing alkali and isocyanate compounds, generally use triethylamine tertiary amine compounds tertiary) or its salts and oxidation or oxidation, to neutralize the base in the lipid, but these substances remain in the film, there is room for improvement in the water resistance of the film. In order to improve dispersion stability, the emulsifier is added in practice, so the influence of an emulsifier on the film should also be considered. In addition, while fully improving the water resistance and other physical properties of the film, fully adapting to the environmental problems in recent years, there is still room for research.

/0 Comments

Adhesive made of acrylic resin

Liquid crystal box is usually used in liquid crystal display, such as TN liquid crystal box (TFT), STN liquid crystal box (STN), the structure of the liquid crystal element with a glass plate on each side of the material. On the surface of glass base plate material, optical films such as polarization film and phase delay film are laminated with adhesive composed mainly of acrylic resin. The general method of producing an optical laminate material consisting of a glass base plate material, an adhesive, and an optical film in this order is to first obtain an optical laminate film having an optical film and an adhesive layer consisting of an adhesive layer laminated on it, and then laminate the glass plate material on the surface of the adhesive layer.

Acrylic pressure sensitive adhesive

This optical laminated film has a tendency to curl due to large size changes caused by expansion and contraction under heating or humidification and heating, resulting in blistering in the adhesive layer of the resulting optical laminated material and peeling (detachment) between the adhesive layer and the glass plate material. When heated or humidified and heated, the distribution of residual stress on the optical laminate film becomes uneven, and stress concentration occurs around the peripheral parts of the optical laminate material, resulting in light leakage in the TN liquid crystal cell (TFT). To solve this problem, an adhesive has been proposed. It is mainly composed of a structural unit of N-vinylpirolidone, that is, an acrylic resin derived from monomers with heterocyclic rings in the molecule (published Japanese patent application (JP-A) 5-107410). The problem, however, is that when liquid crystal cells made of optically laminated materials with adhesive layers are kept under humidified and heated conditions, Where the adhesive layer is composed mainly of acrylic resin with n-vinylpyrrolidone derived structural units, light leakage will occur.

/0 Comments

Acrylic/epoxy binders have been used in applications where compositions are required to demonstrate rapid curing and flexible bonding qualities

Acrylic/epoxy binders have been used in applications where compositions are required to demonstrate rapid curing and flexible bonding qualities.

Although acrylic based adhesives generally have good adhesion to different substrates such as plastics, they are generally not ideal for heat resistance. Curable epoxy resins have also been used as adhesive compositions. Epoxy resins form dense polymer networks that generally exhibit desirable thermal properties. But epoxies tend not to bond well to plastics and tend to be brittle, displaying poor impact resistance. Generally speaking, the slow curing of epoxides makes them unsuitable for many industrial applications.

pressure sensitive adhesive

Many adhesives show poor physical properties such as decreased impact strength, poor bonding ability, and curing time for different applications. These physical properties can be improved by adding impact modifiers and other copolymers to adhesives. Unfortunately, although impact modifiers usually improve some physical properties, they usually show high heat resistance. As more and more plastics are used in some industrial applications such as motor vehicle assembly, there is an ongoing need for adhesives that can be used in plastics and metals to form adhesive bonds that remain cohesive under a wide range of adverse conditions. A requirement for a novel fast setting, room temperature curable adhesive, the adhesive assembly has the characteristics of room temperature curing and rapid setting of an acrylic based adhesive, and the heat resistance of an epoxy resin based adhesive. Furthermore, the adhesives required are heat and impact resistant and can be used to bind difficult substrates.

One implementation is a heat-resistant and impact-resistant adhesive. The adhesive includes at least one acrylic-based monomer, at least one epoxy monomer/resin, at least one bifunctional monomer chemically reactive with the acrylic-based monomer and the epoxy monomer/resin, at least one impact modifier, and a catalyst system. The adhesive also contains at least one elastomer.

Another embodiment is a method for manufacturing the adhesive. The method includes steps for bringing a mixture in contact with an activator wherein the mixture includes at least one acrylic-based monomer, at least one epoxy monomer/resin, at least one bifunctional monomer reactive with an acrylic-based monomer and an epoxy monomer/resin, at least one impact modifier and a catalyst system.

/0 Comments

How to stabilize cyanoacrylate adhesive?

Cyanoacrylate binder is a monomer binder. They are based on an ester of a – cyanoacrylate. This vinegar can be polymerized by free radical and anionic polymerization. In this case, anionic polymerization can be caused by tiny amounts of water found on almost any surface. As a result, cyanoacrylate adhesives solidify rapidly when introduced between two surfaces stored under environmental conditions.

pressure sensitive acrylate adhesive

In terms of adhesive technology, the particular advantage of cyanoacrylate adhesives lies precisely in their speed of reaction and the high bond strength they form, especially when using polar substrates. However, stabilizers must be added to the production and storage of adhesives. A system of stabilizers must be selected so that polymerization does not occur in sealed drums during transport and storage, even at high temperatures and after long periods of time, otherwise, polymerization will occur immediately after application. Therefore, in addition to the known free radical polymerization inhibitors, cyanoacrylate binders are often added to inhibit anionic polymerization.

For example, in DE-OS 21 00 026 it is proposed to add a strong acid cation exchanger as an inhibitor. Among them, the cation exchanger based on crosslinked polystyrene containing sulfonyl group is preferred. The disadvantage of this method is that the added ion exchanger can easily impede the outflow of the adhesive, and, as a solid, the ion exchanger cannot operate through the entire volume of the adhesive

In German patent application DE4109 105, surface modification of cyanoacrylate adhesive storage container was proposed to contain acid groups. Although this suggestion can be successfully implemented, there is a problem here, which is that the inhibitor effect only occurs near the walls of the container.

Another way to stabilize cyanoacrylate binders is to add sulfur dioxide as an inhibitor. Although this measure has been successfully applied in practice, it is worth noting that sulfur dioxide is a gaseous substance, so it is difficult to add it uniformly, with the accompanying result that mass changes will occur. In addition, sulfur dioxide can escape from the adhesive container by diffusion during storage.

/0 Comments