Flame-retardant polyether polyol and preparation method thereof

Abstract

The invention discloses flame-retardant polyether polyol and a preparation method thereof. The preparation method comprises the following steps: weighing 3 parts (mole fraction) of a formaldehyde solution, and adjusting the pH value of the formaldehyde solution by using a 0.1 M NaOH solution until the the formaldehyde solution is slightly alkaline; adding 0.5-1 part (molar fraction) of dicyandiamide, carrying out heating to 75 DEG C, carrying out a hydroxymethyl reaction, adding 1 part of melamine after complete dissolution, and continuing reacting for 1.5 hours after a formed system is completely dissolved into clear liquid; and weighing 20 parts (in a weight ratio with melamine) of polyether polyol, carrying out heating to 80 DEG C, dropwise adding hydroxymethylate into the polyether polyol, and continuing reacting for 2 hours. According to the invention, polyhydroxymethyl melamine is obtained through hydroxymethylation reaction of melamine and formaldehyde, and then undergoes condensation with polyether, thereby obtaining the flame-retardant polyether polyol; and the flame-retardant polyether polyol has the characteristics of no toxicity and efficient flame retardance, and is halogen-free, efficient and flame-retardant, and moreover, system viscosity can be effectively adjusted by adjusting a ratio of dicyandiamide to melamine.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis, in particular to a flame-retardant polyether polyol and a preparation method thereof. Background technique [0002] Polyurethane foam has excellent physical and mechanical strength, chemical corrosion resistance and other properties, and has become an indispensable material in many fields. However, the oxygen index of polyurethane foam without flame retardant treatment is only about 18, which is a flammable material. Its application is greatly limited due to its high resistance. Polyether polyol is an important raw material for polyurethane foam materials. Its flame-retardant modification is an important method for flame-retardant polyurethane foam. At present, flame-retardant polyether polyols include Addition type and reaction type, compared with the addition type, the reaction type flame retardant uses chemical bonds to firmly combine the reactive flame retardant group (containing ha...

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Problems solved by technology

[0002] Polyurethane foam has excellent physical and mechanical strength, chemical corrosion resistance and other properties, and has become an indispensable material in many fields. However, the oxygen index of polyurethane foam without flame retardant treatment is only about 18, which is a flammable material. Its application is greatly limited due to its high resistance. Polyether polyol is an important raw material for polyurethane foam materials. Its flame-retardant modification is an important method for flame-retardant polyurethane foam. At present, flame-retardant polyether polyols include Addition type and reaction type, compared with the addition type, the reaction type flame retardant uses chemical bonds to firmly combine the reactive flame retardant group (containing halogen, N, P, etc.) Migration problem in the matrix, so it has excellent flame-retardant durability. However, the flame-retardant polyether polyols currently developed add more toxic halogen elements to achieve high-efficiency flame-retardant effects, which leads to high toxicity of gas products and high cost. High disadvantage