Red phosphorus flame-retardant compound as well as preparation method and application thereof

Abstract

The invention discloses a red phosphorus flame-retardant compound and a preparation method and application thereof.The compound is composed of, by mass, 30-70 wt% of aliphatic polyamide, 2-15 wt% of red phosphorus, 0.5-5 wt% of phosphorus-containing epoxy resin, 5-20 wt% of flexibilizer, 10-50 wt% of enhancer and less than or equal to 5 wt% of auxiliaries, the aliphatic polyamide is selected from one or a mixture of two or more of PA6, PA66, PA66 / 6, PA610, PA612, PA46, PA56, PA1010, PA11 and PA12, and the auxiliaries are selected from one or a mixture of two or more of PA6, PA66, PA66 / 6, PA610, PA612, PA46, PA56, PA1010, PA11 and PA12. The red phosphorus is powder with the D50 particle size of 1-20 microns, the phosphorus content of the phosphorus-containing epoxy resin is 2-4 wt%, and the phosphorus-containing epoxy resin is obtained by reacting DOPO or DOPO-HQ with epoxy resin. Through synergistic flame retardance of the phosphorus-containing epoxy resin and the red phosphorus, the problems that the red phosphorus is easy to separate out and process and degrade are solved, and the product can be used for electronic devices such as photovoltaic connectors.

Description

Technical field [0001] The present invention belongs to the technical field of polymer materials, and more particularly to a red phosphorus flame retardant complex and a preparation method thereof. Background technique [0002] The photovoltaic connector is one of the key components of "light transfer". It is widely used in power generation, energy storage and downstream terminal products. It has long exposed to ultraviolet, high / low temperature, high pressure and other extreme environments, waterproof, resistance The performance of aging, anti-high / low temperature, etc., requires the electrical and impact RTI relative temperature index of the production material not less than 125 ° C, and passed F1 certification. The RTI (Relative Thermal Index) is determined according to the UL746B method, indicating that the original value of the material is reduced to 50% after 10 hours, and is usually the highest temperature used by the material, and F1 is based on the UL746C method, ind...

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Problems solved by technology

However, the shortcomings of red phosphorus are also obvious. The processing stability is not good, and it is easy to degrade and release phosphorus compounds when it is damp and over-processed. Moreover, its compatibility as an inorganic flame retardant polymer is not good, and it is very difficult to absorb moisture and high temperature. Easy to precipitate from semi-crystalline polyamide resin, not easy to pass HAST accelerated aging test

[0004] In the prior art, red phosphorus is stabilized by adding metals and their compounds. For example, the patent application with publication number CN104125979A uses copper oxide / zinc oxide mixture as a stabilizer for red phosphorus flame-retardant polyamide to prevent red phosphorus from degrading. Publication number is CN102093711A The patent application of the Chinese patent application uses specific copper compound and zinc compound as inhibitors to reduce the precipitation of phosphorus compounds. The patent application with the publication number CN103797058A stabilizes the red phosphorus flame-retardant polyamide with silver / zinc oxide mixture, but the disadvantage of the above method is Metal compounds degrade electrical and mechanical properties of polymers

In addition, there is also a method of reducing the ratio of red phosphorus and stabilizing red phosphorus by adding other flame retardants synergistically, such as the condensation product of melamine and hypophosphite and red phosphorus synergistic flame-retardant polyamide for patent application with publication number CN1950456A, Publication No. CN103328572A patent uses cyclic phenoxyphosphazene (HPCTP) and red phosphorus to combine flame-retardant polyamide, but still cannot solve the problem of poor compatibility between red phosphorus and polymers

Therefore, there is still a lack of red phosphorus flame retardant compounds that meet the requirements of stable processing, excellent impact characteristics and electrical properties, and will not precipitate.

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