A phosphorus-nitrogen-boron highly flame-retardant flexible epoxy resin composition and its preparation method

Abstract

The invention relates to a P-N-B high-flame-retarding flexible epoxy resin composition, being a powder, and a preparation method thereof. The composition contains three flame-retarding elements of P,N and B, which are all located on a molecular chain, and contains a phosphine oxide structure and a flexible chain segment, so that when being applied to electronic packaging materials, the composition greatly improves the flame-retarding effect, flame-retarding durability and cold / heat impact resistance of the electronic packaging materials, and also optimizes the heat resistance, chemical resistance and damp-proof effect of the electronic packaging materials.

Description

technical field [0001] The invention belongs to the field of electronic packaging materials, in particular to a phosphorus-nitrogen-boron highly flame-retardant and flexible epoxy resin composition and a preparation method thereof. Background technique [0002] Epoxy resin refers to a polymer containing two or more epoxy groups, with aliphatic, alicyclic or aromatic organic compounds as the backbone and formed by the reaction of epoxy groups; epoxy groups can be located in the molecular chain The end, middle or ring structure of the segment; it is one of the most widely used matrix resins in polymer matrix composites. Due to the special molecular structure of epoxy resin, epoxy resin has excellent adhesion, heat resistance, chemical resistance and excellent electrical insulation properties, and is easy to process, low shrinkage, small linear expansion coefficient and low cost. Advantages such as low cost. Widely used in the packaging of electronic components such as varist...

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Problems solved by technology

[0006] Regarding synergistic flame retardant and flexibility, a flexible flame retardant curing agent is described in the patent CN201310245491.1, but this curing agent is synthesized by using multifunctional flame retardant materials, resulting in the viscosity of the curing agent being too large and acidic. The value range is narrow and it is impossible to synthesize low acid value polyester (acid value≤80mgKOH / g) and the synthesis reaction temperature cannot be too high (no more than 220°C); on the other hand, the flexibility of this curing agent is also significantly worse than that of the present invention The curing agent in the present invention, and the flame retardant efficiency can not reach the synergistic flame retardant of phosphorus, nitrogen and boron in the present invention

In CN201310245173.5, a phosphorus-nitrogen synergistic flame-retardant curing agent is also described. The curing agent is also synthesized by using a multifunctional flame-retardant material, which also leads to a large melt viscosity and a narrow acid value range of the curing agent, and Higher phosphorus content makes this invention unable to synthesize high acid value curing agent (acid value ≥ 150mgKOH / g), and has no advantage in flexibility

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