Synthesis of amino-base resin-base polyurea polylol

Abstract

Synthesis of amino-resin polyurea polyol is carried out by mixing melamine with methyl aldehyde, agitating, regulating pH value by alkali agent, adding into catalyst, heat reacting to obtain polyhydroxy-methyl-melamine solution, heat reacting the obtained solution with excessive methyl alcohol to obtain amino-resin solution, agitation mixing the obtained amino-resin solution with poly-ether polybasic alcohol with molecular weight 3000, depress distilling to remove small molecule, cooling to lower temperature, adding into paraffin solvent and tertiary amine catalyst, agitating, adding into isocyanate, heat reacting, decompressing and removing residual small molecules to obtain final product. It is simple, cheap, has lower acidity, higher oxygen index and no halogen, phosphor and antimony.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a synthesis method of amino resin-based polyurea polyol. Background technique [0002] Polyurea polyol (PHD) is a branched-chain copolymer formed by the gradual addition reaction of polyisocyanate and polyamine in polyol. It is a high-viscosity, white or beige liquid. Polyurea polyol contains a large amount of polyurea particles containing nitrogen groups, so that the produced polyurethane foam can not only improve the flame retardancy, but also improve the load-bearing capacity of foam plastics. The foam prepared by it can be added without or with very little Only a small amount of flame retardant can achieve a better flame retardant effect, and avoid the migration of part of the flame retardant during the use of the foam, resulting in a decrease in flame retardant performance. In addition, polyurea polyol helps to open the cells when the foam rises t...

AI Technical Summary

Problems solved by technology

When ethylenediamine is used to prepare polyurea polyol, due to the poor solubility of ethylenediamine in polyether, the reaction with isocyanate is too fast, the molecular weight of polyurea increases sharply, and it precipitates out from polyether rapidly, and the obtained polyurea polyol is placed Easy to layer; the preparation of polyurea polyols with hydrazine hydrate will not cause sudden polymerization of polyurea molecules due to the elimination of partial steric effects due to the presence of two methylene groups like ethylenediamine, so it is suitable for polyurea polyols Alcohol preparation, but the price is high and not very economical; piperazine is a cyclized product containing two symmetrical secondary amino groups. When one of the secondary amino groups reacts with isocyanate, the reaction ability of the other secondary amino group has little effect, and the secondary amino group The reaction ability of polyurea is weaker than that of primary amino groups, so it will not cause sudden polymerization of polyurea molecules, which is more suitable for the preparation of polyurea polyols, but its raw materials are more expensive and the post-treatment is more complicated, which increases the process cost. aspect considerations are not often used