Silicon resin coated expandable graphite flame-retardant ultrahigh molecular weight polyethylene preparation method

Abstract

The invention discloses a silicon resin coated expandable graphite flame-retardant ultrahigh molecular weight polyethylene preparation method. According to the present invention, the surface of expandable graphite is coated with a layer of a silicon resin, and due to the synergistic flame retardant property of the silicon resin and the expandable graphite, the flame retardant performance of the expandable graphite is increased so as to reduce the consumption of the flame retardant, and the compatibility between the ultrahigh molecular weight polyethylene and the expandable graphite is improvedso as to increase the interaction between the expandable graphite and the ultrahigh molecular weight polyethylene matrix, such that the problem that the of the flame retardant causes the deterioration of the mechanical property of the matrix can be solved.

Description

technical field [0001] The invention relates to a preparation method of a flame-retardant material, in particular to a preparation method of expandable graphite flame-retardant ultra-high molecular weight polyethylene coated with silicone resin. Background technique [0002] Ultra-high molecular weight polyethylene materials have excellent properties, such as excellent wear resistance, chemical corrosion resistance, low friction coefficient, high low-temperature impact strength, and a service life of up to 50 years. In recent years, it has been widely used in mines, power plants, petroleum, chemicals, machinery, shipbuilding, aviation instruments, train EMUs and other fields that have special requirements for high impact resistance, high wear resistance, and corrosion resistance. However, as a polyolefin material, ultra-high molecular weight polyethylene is extremely flammable, and a large amount of molten droplets will be produced during the combustion process, which will c...

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Problems solved by technology

However, as a polyolefin material, ultra-high molecular weight polyethylene is extremely flammable, and a large amount of molten droplets will be produced during the combustion process, which will cause the flame to spread and cause "secondary" disasters. Therefore, the application field of ultra-high molecular weight polyethylene is restricted. In order to improve the flame retardancy of UHMWPE so that it can be applied to more fields, there have been many studies in recent years. Among the intumescent flame retardants, expandable graphite is the most commonly used One of the flame retardants is a structure in which sulfuric acid molecules are inserted between graphite layers after natural graphite is treated with sulfuric acid; when subjected to high temperature, the carbon layer will expand into a worm-like structure with a lower density, forming A very good insulating layer to achieve flame retardant effect; many studies have reported that expandable graphite can be used in combination with flame retardants such as phosphorus nitrogen compounds and metal oxides, which can produce synergistic effects, and the flame retardant purpose can be achieved by adding a small amount; but At present, the commonly used expandable graphite still has problems such as large amount of addition, loose and easy to fall off carbon layer, poor compatibility with polymer matrix, and serious deterioration of mechanical properties of ultra-high molecular weight polyethylene matrix by adding flame retardants.

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