Improve the antistatic property of pressure sensitive adhesive

Improve the antistatic property of pressure sensitive adhesive

With the rapid development of electronic science and technology, microelectronics are becoming more and more sophisticated, and the damage caused by static electricity to electronic equipment such as touch screens, chips, and large-scale integrated circuits is more and more serious. Silicone pressure sensitive adhesive has good chemical resistance, weather resistance, heat resistance, and a wide range of use, is a good silicone pressure sensitive adhesive material that can be prepared with an antistatic effect. Using the antistatic protective film prepared by it, it is easy to derive the static electricity generated in the process of electronic materials, so as to avoid the damage of electronic materials caused by electrostatic accumulation.

How to prepare a silicone pressure sensitive adhesive with a good antistatic effect is still an urgent problem to be solved at present. In order to solve the above technical problems, the following technical solutions are provided. A method of preparation of antistatic silicone pressure sensitive adhesive, including the following steps:

step 1: take the multi-walled carbon nanotubes, modified ionic liquid, grinding 50  60 min, to join the deionized water, ultrasonic dispersion 90  120 min, by adsorption of an ionic liquid suspension of carbon nanotubes, in 65  drying under 70 ℃, carbon nanotubes by adsorption of ionic liquid;

Step two: Organic silicon resin PSA1057, ethyl acetate, crosslinking agent, a platinum catalyst, hydrogen silicone under a speed of 4500 r/min 3500  star 1  2 h, add heat resistant filler, adsorption of ionic liquid carbon nanotubes, under a speed of 6000 r/min 5000  star 3  4 h, let stand deaeration, An antistatic silicone pressure sensitive adhesive was obtained.

Compared with the existing technology, the invention has the beneficial effects of

(1) this application USES 1  butyl imidazole, 3  bromine propionic acid, preparation of ionic liquid, and then adds in the six fluorides, potassium phosphate, through ion exchange preparation of carboxyl ionic liquids, the carboxyl ionic liquid, chemical stability, good solubility, added to the pressure sensitive adhesive, can make it has good antistatic performance. After the hydroxylation of talc powder, the hydroxyl group on talc powder will undergo an esterification reaction with the carboxyl group on the carboxyl ionic liquid, and then graft together, which can improve the dispersion of talc in the pressure sensitive adhesive.

Meanwhile, the hydroxyl group on talc can improve the molecular polarity of organosilicon resin, improve the adhesion force of organosilicon pressure sensitive adhesive, and improve the peeling force of pressure sensitive adhesive.

(2) Ionic liquid is a substance composed of anions and ions, which can improve the antistatic performance of pressure sensitive adhesive, but the stability is not good in pressure sensitive adhesive. Multi-walled carbon nanotubes and mechanical performance are good, good electrical conductivity, but easy to reunite, modified ionic liquid adsorbed on multi-walled carbon nanotubes, solved the multi-walled carbon nanotubes not easily dispersed in the psa, control of multi-walled carbon nanotubes, modified ionic liquid mass ratio of (0. 1  0. 2): At this time, to add a large amount of multi-walled carbon nanotubes, carbon nanotubes can lap together to form a conductive path, to reduce the resistivity, improve the antistatic property of pressure sensitive adhesive.