Novel halogen-free electronic paste, and preparation method and use thereof

Abstract

The invention discloses a halogen-free electronic paste, and a preparation method and a use thereof. The halogen-free electronic paste comprises the following components by mass percent: 3-8 percent of polyurethane resin, 9-24 percent of high-molecular-weight epoxy resin, 0.3-0.8 percent of curing accelerator, 0.8-2 percent of phthalate ester additive, 20-35 percent of diethylene glycol monobutyl ether acetate and 42-65 percent of conductive medium. The halogen-free electronic paste has the advantages of environmental protection and can reduce the hazards to human health; the paste adopts pre-mixing, heating and catalyzing, quick freezing and other chemical and physical means, and combines the two resins together well, so that the paste not only has adhesion, conductivity, flexibility and other properties, but also has more excellent properties compared with the traditional product containing halogen; in addition, the halogen-free electronic paste can be applied to keys of mobile phones or keyboards of computers, and the paste is dried, cured and crosslinked into a lead or a reticulated lead product with excellent properties, i.e., parts of various electronic products.

Description

technical field [0001] The invention relates to the technical field of conductive electronic paste, in particular to a halogen-free electronic paste and its preparation method and application. Background technique [0002] There are many kinds of electronic pastes sold and applied in the market, which are mainly used for electrical conduction and electromagnetic wave shielding on electronic products; for example: membrane switches, computer keyboards, circuit board printing, mobile phone button conductive shielding, etc. The main components of the existing electronic paste are: combined resin polymer, solvent, conductive medium plus an appropriate amount of conductive additives; and at this stage in the preparation process, the synthetic resin is still vinyl chloride vinyl acetate polymer, The chlorine content exceeds 30% (parts by weight), which is extremely incompatible with the increasingly high environmental protection requirements, because many countries (especially the...

AI Technical Summary

Problems solved by technology

The main components of the existing electronic paste are: combined resin polymer, solvent, conductive medium plus an appropriate amount of conductive additives; and at this stage in the preparation process, the synthetic resin is still vinyl chloride vinyl acetate polymer, The chlorine content exceeds 30% (parts by weight), which is extremely incompatible with the increasingly high environmental protection requirements, because many countries (especially the European Union) have clearly prohibited the use of halogens (four items of halogen: fluorine, chlorine, bromine) , iodine) electronic products

Vinyl chloride vinyl acetate polymer is currently considered to have irreplaceable performance (adhesion, electrical conductivity, flexibility, etc.) Polymer products that also exhibit electronic paste properties as binders