Method for preparing heating viscosity-reducing adhesive protective film

Abstract

The invention discloses a method for preparing a heating viscosity-reducing adhesive protective film. The method for preparing the heating viscosity-reducing adhesive protective film comprises a heating viscosity-reducing adhesive, and is characterized in that the heating viscosity-reducing adhesive is foamed by mixing resin, a curing agent, a solvent, a self-expanding microsphere foaming agent, atoner and an OBSH foaming agent, The heating viscosity-reducing adhesive protective film comprises the following components in parts by mass: 25 to 60 parts of the resin, 0.5 to 10 parts of the curing agent, 30 to 60 parts of the solvent, 4 to 8 parts of the self-expanding microsphere foaming agent, 0.5 to 5 parts of the toner, and 0.5 to 2 parts of the OBSH foaming agent. The heating viscosity-reducing adhesive protective film finished product has strong bearing capacity, strong resistance to pressure die-casting, strong viscosity reduction after adhesion to FPC, and easy tearing, the protective film can be blown off the FPC by air blowing at a lower heating temperature (80 DEG C), the use effect is good, the heating temperature is higher, the tearing effect is better, and the upper limit of the use temperature can reach 250 DEG C.

Description

technical field [0001] The invention relates to the field of protective film preparation, in particular to a method for preparing a heat-viscosity-reducing protective film. Background technique [0002] In the process of producing FPC for mobile phones and portable electronic devices, in order to protect the product and facilitate the transfer of the FPC, and avoid or reduce the pressure damage to the FPC, a protective film is usually used and adhered to the end surface of the FPC, through the protective film Carry the circuit board to transfer the produced FPC to the location with processing. [0003] In the prior related art, the surface of a general protective film is coated with an adhesive, so that the contact surface (ie, the adhesive surface) between the protective film and the FPC has a certain degree of viscosity, so that the protective film can be stably attached to the FPC. However, the existing protective film pasted on the FPC has the following problems: first,...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of preparation method of heat-reducing adhesive protective film, by adding self-expanding microsphere foaming agent and OBSH foaming agent in heating-reducing adhesive layer material, they can play the function of foaming and vulcanization Double function, and achieve a good balance, OBSH foaming agent has a small heat release, which is beneficial to control the closed-cell foaming of thick PVC, and will not accumulate heat to cause coking in the center, so that the viscosity of the substrate surface can be reduced after heating, and it is convenient to use Remove the protective film after heating to solve the problem that the protective film on the market cannot be blown off after being adhered to the FPC, and it needs to be heated at a high temperature before it can be automatically peeled off without residue