A kind of preparation method of foaming auxiliary agent taking urea as matrix

Abstract

The invention discloses a preparation method of a blowing promoter using urea as a basal body. The blowing promoter is a complex of polyoxyethylene PEO and urea, and the method comprises the following steps: 1, dissolving urea into water, stirring for dissolving the urea to prepare a urea water solution; 2, adding the polyoxyethylene PEO into the urea water solution in the proportion of 1 mole of monomer bond molecular section to 2 mole of urea, heating and stirring until the solution is colorless transparent liquid; 3, stopping stirring and performing reduced pressure distillation on the liquid, stopping distillation when the solution is distilled to be in a solid-liquid coexistent viscous state, weighing the substances and drying to obtain a complex crystalline. According to the preparation method, the complex of the polyoxyethylene PEO and urea is used as an activating agent of a blowing agent, and a simple and economic method is disclosed. The solvent is water and the cost is low; because of single solvent, the recycling of the substances is facilitated.

Description

technical field [0001] The invention relates to the field of foaming aids, more specifically, it relates to a method for preparing a foaming aid with urea as a matrix, and the foaming aid is a complex product of PEO (polyethylene oxide) and urea. Background technique [0002] Blowing agent AC (abbreviated as AC) is the most commonly used type of organic blowing agent. AC has high gas generation capacity and good dispersion to release N 2 and CO 2 Mainly, and it is not easy to escape from the foam; the selection range of AC activator is wide, which greatly expands the scope of application of AC. [0003] Pure AC has some deficiencies: high decomposition temperature (195-220°C), fast decomposition rate and heat release. In order to improve the deficiencies of pure AC, foreign countries began to modify pure AC in the 1970s, and achieved good results. Studies have shown that metal oxides, organic acids, and basic salts such as lead, zinc, and cadmium have strong activation ef...

AI Technical Summary

Problems solved by technology

[0003] Pure AC has some disadvantages: high decomposition temperature (195-220°C), fast decomposition speed and heat release. In order to improve the shortcomings of pure AC, foreign countries have modified pure AC since the 1970s and achieved good results.

The disadvantage of this method is that the cost of using two organic solvents is high, the solvent recovery is difficult, and the environment is damaged.

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