Solvent-free coating composition used for electron beam curing film forming and having shape memory function and preparation method thereof

Abstract

The invention relates to the technical field of electron beam curing coatings, in particular to a solventless coating composition used for electron beam curing film forming and having a shape memory function and a preparation method of the solventless coating composition. The solvent-free coating composition disclosed by the invention is prepared from the following raw materials in parts by weight: 30-40 parts of modified shape memory polyurethane, 20-30 parts of polyurethane acrylic resin, 30-40 parts of a monomer and 0.5-1 part of an auxiliary agent. The electron beam curing film-forming solventless coating is applied to the field of mobile phone protection pastes, an electron beam curing mode is adopted, the curing process efficiency is high, thermal stress is small, the curing film-forming porosity is low, and the characteristic that an existing TPU self-repairing pasting film and an existing PVC self-repairing pasting film are not resistant to fingernail marks is effectively changed; in addition, a thermally induced shape memory form is also adopted, so that the finished mobile phone film can still keep a fixed shape under high-temperature and high-humidity conditions after being stretched, shaped and pasted on a mobile phone screen, and the problem that a flexible base material pasted 3D structure mobile phone glass screen rebounds or has a white edge under the high-temperature and high-humidity conditions can be effectively solved.

Description

technical field [0001] The invention relates to the technology in the field of electron beam curing coatings, in particular to a solvent-free coating composition used for electron beam curing to form a film and has a shape memory function. Background technique [0002] With the development of the 3C electronics industry, mobile phones, tablets and other industries will usher in a new round of changes. 2.5D, 3D and even folding screen mobile phones are more and more widely used. Changes in the structure of mobile phones also have new effects on mobile phone protective films. Require. [0003] For 3D structure and folding screen mobile phones, traditional tempered glass and PET hardened protective film cannot be bent. At present, soft substrates such as TPU self-healing film and PVC self-healing film are mainly used in the market to replace traditional tempered glass. And PET hardened film. These soft substrates are not resistant to nail prints on the mobile phone screen, an...

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Problems solved by technology

[0006] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a solvent-free coating composition for electron beam curing and film formation with shape memory function, which solves the problems of existing TPU self-repair and PVC self-repair These two types of soft film substrates are not resistant to nail marks, and because the R angle of the mobile phone is getting larger and larger, it is easy to rebound or produce white edges under subsequent high temperature and high humidity conditions.

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