Archive for category: Industry News

The traditional mobile phone battery fixing method is to directly fix the mobile phone battery with a double-sided adhesive on the base. When the mobile phone battery needs to be repaired and replaced, on the one hand, it is inconvenient to disassemble, on the other hand, disassembly will cause bending or damage to the battery, and even outflow of battery electrolyte, damage the mobile phone and human health.

Chinese patent CN 207418650 U discloses a kind of easy to tear tape wrapped battery, this kind of easy to tear tape can be wrapped into the mobile phone, when the need to repair or replace the mobile phone battery, only need to pull the removable film of easy-to-tear tape, the battery can be removed from the easy to tear tape, so as to realize the battery without damage disassembly. However, this method requires a double-sided adhesive to fix the easy-to-tear tape wrapped in the battery compartment of the mobile phone, which takes time to operate and increases the process and cost of battery packaging.

On this basis, it is necessary to provide a double-sided pressure-sensitive tape for fixing the mobile phone battery, which can realize the rapid and non-damaging disassembly of the battery, simplify the assembling process of the mobile phone battery, and at the same time realize the tape thinning and provide space for increasing the capacity of mobile phone battery. In order to solve the above technical problems, the invention adopts the following technical scheme: a double-sided pressure-sensitive tape comprises a first-release film, a first pressure-sensitive adhesive layer, a base layer, a second pressure-sensitive adhesive layer, and a second-release film arranged successively from bottom to top; The 180 degree peeling force of the first pressure-sensitive adhesive layer is 20N/24mm ~ 35N/24mm; The 180 degree peeling force of the second pressure-sensitive adhesive layer is 10N/24mm ~ 20N/24mm.

The invention also provides a preparation method for the double-sided pressure sensitive tape, including the following steps: Step S1: Prepare a first polyacrylate pressure sensitive adhesive and a second polyacrylate pressure sensitive adhesive; Step S2: the first polyacrylate pressure sensitive adhesive is coated on one side of the base, and then the base is put into the drying temperature of 75℃ ~ 85℃, 85℃ ~ 95℃, 95℃ ~ 105℃, 95℃ ~ 105℃, 85℃ ~ 95℃ and 75℃ ~ 85℃ in the oven drying, each drying time is 10s ~ 14s; The first polyacrylate pressure sensitive adhesive after drying to form a first pressure sensitive adhesive layer; The first pressure sensitive adhesive layer is coated with a first release film; Step S3: the second polyacrylate pressure sensitive adhesive is coated on the other side of the base, and then the base is put into the drying temperature of 75℃ ~ 85℃, 85℃ ~ 95℃, 95℃ ~ 105℃, 95℃ ~ 105℃, 85℃ ~ 95℃ and 75℃ ~ 85℃ in the oven drying, each drying time is 10s ~ 14s; The second polyacrylate pressure sensitive adhesive after drying to form a second pressure sensitive adhesive layer; The double-sided pressure sensitive tape is prepared by covering the second pressure sensitive adhesive layer with a second release film. After six dryings, the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer have a high drying degree and reduce the appearance of bubbles in the adhesive layer.

As a one-dimensional nanomaterial, carbon nanotubes (CNTS) are light in weight, perfectly connected in a hexagonal structure, and possess many abnormal mechanical, electrical, and chemical properties. In recent years, with the deepening of the research on carbon nanotubes and nanomaterials, their broad application prospects have been constantly shown. In materials science, the length of carbon nanotubes is used as a conductive substance to add to materials. For example, when applied in the silicone pressure-sensitive adhesive protective film system, carbon nanotubes can be used as a conductive material to add the adhesive layer, giving the protective film adhesive layer excellent anti-static and even conductive properties.

However, since the thickness of the silicone layer in most of the pressure-sensitive adhesive protective films is only 5-20μm, obvious black particles can be seen on the adhesive surface after the addition of ordinary carbon nanotubes, which is mainly due to the problem of uneven dispersion of the current carbon nanotubes, and poor compatibility in the silica gel system, easy to produce agglomeration, resulting in visible black particles. Therefore, it is difficult to be applied to silicone pressure-sensitive adhesive systems.

In addition, some carbon nanotubes after treatment and modification, because their system contains P, N, S and other materials easy to lead to the addition of molded silicone does not cure, or its dispersion medium is water resulting in silicone does not cure, or high boiling point organic solvents such as N-methyl pyrrolidone is difficult to boil from the pressure sensitive adhesive system, resulting in its difficult to be applied to silicone pressure sensitive adhesive. According to the industry demand for antistatic organosilicon pressure-sensitive adhesive, it is urgent to develop a new treatment method for organosilicon-modified carbon nanotubes with uniform dispersion and non-agglomeration, using low boiling point organic solvent and not using substances containing P, N, S that inhibit the activity of platinum catalyst.

The technical problem to be solved by the invention is to provide a treatment method of organosilicon modified carbon nanotubes, which can effectively improve the dispersion of carbon nanotubes in organosilicon pressure-sensitive glue, does not affect the curing of molded silicone, good storage stability, applied in the pressure sensitive glue system can greatly improve the rubber surface conductivity of the pressure sensitive glue protective film. In addition, it has little influence on the transmittance and peeling power of the protective film, so as to overcome the shortcomings of the existing dispersion technology of carbon nanotubes and broaden the application field of carbon nanotubes.

Pressure-sensitive adhesives (PSA) are known to provide adhesion or stickiness to a variety of substrates when applied at room temperature (in the temperature range of about 20 ° C to about 25 ° C). This adhesion provides instantaneous adhesion to the substrate when subjected to pressure. Psas are generally easy to handle in solid form and have a long service life, so they are widely used in the manufacture of many products.

PSA, for example, provides a convenient and economical way to label a variety of goods, such as glass, metal, and plastic parts of consumer and industrial products. PSA can also be used in the manufacture of car parts. In some applications, PSA is used to bond parts to each other.

PSA can also provide other functional features, such as damping. Damping may include damping to mitigate resonances or other vibrations caused by a variety of sources, for example, in the engine compartment, cab walls, housing, floor and ceiling systems, door panels, and brake systems.

Damping can also include muffling to reduce noise. Vibration can occur in many applications, including but not limited to transportation (e.g., ships and other vessels, railcars, cars, trucks, buses, motorcycles, aircraft, and spacecraft), electronics, building materials, and appliances. However, frequency and temperature ranges may vary from application to application, and certain methods or techniques are required to reduce vibration.

For this wide range of applications, damping characteristics can be adjusted according to the frequency and temperature of the application. In particular applications, braking systems in transportation applications are generally known to experience vibration. The vibration occurs both in the brake system as a whole and between its components, such as between the brake pad layer and the brake calipers. Vibration leads to undesirable performance characteristics, such as sound production, such as crunch/squeak, or poor vehicle driving, such as rocking. When used in braking applications, PSA attenuates vibration and causes the brake assembly layers to adhere to each other. In another use, electronic devices are also known to vibrate. For example, a computer or other electronic system may vibrate while it is working. PSA performance may also be affected by climate and temperature. Unfortunately, conventional PSA has been found to have damping properties only over a limited range of temperatures and/or frequencies. As a result, different Psas need to be developed for each particular application to meet damping requirements (temperature and frequency).

In a known technique for preventing surface damage (scratches, contamination, corrosion, etc.), protective sheets are bonded to surfaces for protection during the processing and transportation of various articles. The objects to be protected vary greatly. For example, protective sheets are also used on glass panels with low-E (Low radiation) layers.

Glass panels with Low-E layers are preferred for use as building materials such as window panes since the role of Low-E layers is to increase the efficiency of cooling and heating interior Spaces. In the manufacture of such glass plates, a protective sheet is usually attached to the surface of the Low-E layer by its adhesive layer until a glass plate having a Low-E layer and another glass plate are assembled into a pair of glass with the surface of the Low-E layer on the inside (for example, a double layer of glass), otherwise, the Low-E layer will be exposed. This protects the Low-E layer from damage, wear, deterioration, corrosion, etc.

PSA tablets used for surface protection are removed by adhesive at appropriate times after achieving the purpose of protection. Therefore, PSA is designed to have relatively low bonding strength. In particular, for adhesives with large surface areas, limiting adhesion strength is important to avoid slow de-molding (severe stripping) and maintain effective removal.

For example, considering the efficiency of manufacturing, transportation, etc., glass panels for building materials such as window glass, represented by glass panels with Low-E layers, are experiencing an increase in area, and the surface width of mainstream parts is now greater than 2.6m, or even more than 3m. An increase in the surface area of the adhesive can lead to an increase in the adhesive area of the protective sheet (PSA sheet) and further severe stripping. Thus, from the point of view of removal efficiency, the adhesion strength is expected to be limited to the minimum level required.

Changsheng is also 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 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.

Off-line Low-E glass protective film and glue are our hot commodities, with strong peeling strength, and moderate unwinding performance.

Pressure-sensitive adhesive compositions (PSA) have been known for a long time. PSA is an adhesive composition that allows lasting adhesion to the substrate even at relatively weak applied pressures and can be separated from the substrate again substantially without residue after use.

Psas are permanently viscous at room temperature and therefore have a sufficiently low viscosity and high viscosity that they wet the surfaces of the corresponding bonded substrates even at low applied pressures. The adhesiveness and separability of adhesives are derived from their adhesive properties and cohesive properties. A variety of compounds are suitable bases for PSA. Tape equipped with PSA (called pressure-sensitive tape) is currently used in a variety of industrial and household applications. Pressure-sensitive tape usually consists of a carrier membrane equipped with PSA on one or both sides.

There are also pressure-sensitive tapes that consist only of PSA layers and have no carrier film; these are called transfer tapes. Pressure-sensitive tape compositions can vary greatly and are guided by the specific requirements of different applications. The carrier usually consists of a plastic film such as polypropylene, polyethylene, polyester, or paper, woven fabrics, or nonwoven. Self-adhesive or pressure-sensitive adhesive compositions usually consist of acrylate copolymers, silicone (organosilicon), natural rubber, synthetic rubber, styrene block copolymers, or polyurethane. PSA may be modified by mixing a viscosifier resin, a plasticizer, a crosslinker, or a filler to formulate properties suitable for the application. For example, use fillers to improve PSA cohesion. In this case, the combination of filler/filler interactions and filler/polymer interactions often results in the desired reinforcement of the polymer matrix. Fillers are also mixed to increase the weight and/or bulk of the paper, plastics, as well as adhesives and coatings, and other products. Fillers often improve the technical availability of products and have an impact on their quality (e.g., strength, hardness, etc.).

Natural, inorganic, and organic fillers such as calcium carbonate, kaolin, talc, dolomite, etc. are manufactured mechanically. In the case of rubber and synthetic elastomers, suitable fillers may also be used to improve quality, such as hardness, strength, elasticity, and elongation. Widely used fillers are carbonate, particularly calcium carbonate, as well as silicates (calcite, clay, mica), siliceous soil, calcium and barium sulfate, aluminum hydroxide, fiberglass and glass spheres, and carbon black. Inorganic and organic fillers can also be distinguished according to their density. For example, inorganic fillers such as chalk, titanium dioxide, calcium sulfate, and barium sulfate are often used in plastics and adhesives to increase the density of compounds because they themselves have a higher density than the polymer.

The base weight is higher at the same thickness. There are also fillers that reduce the total density of the complex. These include hollow microspheres, which are very large, lightweight fillers. The ball is filled with air, nitrogen, or carbon dioxide; The shell of the ball consists of glass or, in the case of some products, thermoplastic. Especially in the case of automotive applications, plastic is increasingly used instead of metal. These plastics often have low surface energy, which makes bonding with these substrates more difficult. Moreover, adhesive bonding should be as stable as possible against aging and heat. Products used to date are mainly based on acrylates (stable to aging, but not well adhered to surfaces with low surface energy (called LSE surfaces), SBC synthetic rubber (well adhered to LSE surfaces, but not heat resistant), or natural rubber (well adhered to LSE surfaces, but not stable to aging). LSE surfaces specifically include PVA, polystyrene, PE, PP, EVA, or Teflon. However, programs that combine all good qualities are still lacking.