Preparation method of composite flame retardant pretreatment liquid

Abstract

The invention relates to the field of foam plastic modification, in particular to a preparation method of composite flame retardant pretreatment liquid. The preparation method comprises the followingsteps: a) preparing mixed liquid from methyl p-toluenesulfonate and 2-ethyl-4,5-dihydrooxazoline, and shaking and heating to obtain powder; b) adding the powder to hydrogen chloride, heating for reaction, drying by evaporation, adding a saturated sodium hydroxide solution, filtering, washing and drying to obtain a white solid; c) mixing the white solid with methanol, adding sodium hydroxide and carbon disulfide at low temperature, precipitating the solution after reaction, filtering and washing the precipitate, and grinding the precipitate to obtain fine powder; d) mixing sodium hypophosphite,melamine, chlorinated phosphate, tetrachlorobisphenol A and magnesium hydroxide into a mixture, adding the mixture to decalin, then adding a coupling agent, and stirring to obtain a base solution; e)adding a pentaerythritol stearate and polyethylene wax composition into the base solution, adding the fine powder to obtain dispersion liquid, and shaking the dispersion liquid to obtain the composite flame retardant pretreatment liquid.

Description

technical field [0001] The invention relates to the field of foam plastic modification, in particular to a method for preparing a composite flame-retardant pretreatment liquid. Background technique [0002] Polyurethane foam is made of isocyanate and hydroxyl compound through polymerization and foaming. According to its hardness, it can be divided into two types: soft and hard, of which soft is the main variety. Generally speaking, it has excellent elasticity, softness, elongation and compressive strength; good chemical stability, resistance to many solvents and oils; excellent abrasion resistance, 20 times larger than natural sponge; and excellent processing It is a kind of cushioning material with excellent performance, but the price is relatively high. [0003] Polyurethane foam generally improves the flame retardancy of the foam by adding flame retardants to delay burning, block smoke and even self-extinguish the burning part. Polyols containing flame retardant element...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the fact that the halogen elements in the flame retardant in the prior art are easy to volatilize and produce toxic gases when they play a flame retardant role, which is more harmful to the environment and the human body, and at the same time, the compatibility between the flame retardant and the substrate Poor performance, the flame retardant effect cannot be effectively brought into play, and the amount of flame retardant added is too large. A method for preparing a composite flame retardant pretreatment liquid is provided. The prepared composite flame retardant pretreatment liquid has an After the polyurethane foam is pretreated, the polyurethane foam can be treated twice with a heavy metal salt solution, which greatly improves the flame retardancy of the polyurethane foam and avoids the formation of a flame retardant that can play a good flame retardancy. A good flame retardant system that self-absorbs harmful halogen-containing gases produced by volatilization and combustion and has a secondary flame retardant effect