Preparation method of blowing promoter using urea as basal body

A foaming aid and foaming agent technology are applied in the field of preparation of foaming aids, which can solve the problems of high decomposition speed, heat release, and high decomposition temperature, and achieve the advantages of recycling, improving safety performance and high safety performance. Effect

Active Publication Date: 2015-01-28
HANGZHOU HI TECH FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Preparation method of blowing promoter using urea as basal body
  • Preparation method of blowing promoter using urea as basal body

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preparation example Construction

[0017] The preparation method of this foaming aid with urea as the matrix according to the present invention, the foaming aid is a complex of polyoxyethylene PEO and urea, and the specific steps are as follows:

[0018] (1), dissolving urea in water, stirring to dissolve urea, and preparing an aqueous urea solution with a mass fraction of 1% to 10%;

[0019] (2) Add polyoxyethylene PEO to the urea aqueous solution at the ratio of 1 mole of monomeric bonds to 2 moles of urea in polyoxyethylene PEO, heat and stir, set the temperature at 20-70°C, and stir for 0.5 -2h, the solution is a colorless transparent liquid;

[0020] (3) After the stirring is stopped, the above liquid is distilled under reduced pressure, and the temperature is controlled at 40-60°C. When the solution is distilled to a viscous state where solid and liquid coexist, stop the distillation, weigh the mass of the substance, and then carry out a vacuum drying oven. Drying, the temperature is 50°C, the vacuum deg...

Embodiment 1

[0027] First, add 0.3g of urea into 15ml of water, stir to dissolve the urea completely, then add 0.11g of PEO with a relative molecular weight of 3.5 million into the aqueous urea solution, and stir in a water bath at 40°C for 2 hours to form a transparent solution with a certain viscosity. Then carry out vacuum distillation at 40°C. When the solution becomes semi-solid state, stop stirring and transfer to a vacuum drying oven for drying. After drying, it becomes a complex crystal.

Embodiment 2

[0029] First, add 60g of urea to 50ml of water, stir to dissolve the urea completely, then add 22g of PEO with a relative molecular weight of 3.5 million to the urea solution, and stir the two in a 50°C water bath for 0.5h to form a transparent solution with a certain viscosity . Then carry out vacuum distillation at 60°C. When the solution becomes a semi-solid state, stop stirring and transfer to a vacuum drying oven for drying. After drying, it becomes a complex crystal.

[0030] 2. Compounding of complex and ADC foaming agent

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/333C08J9/10
Inventor 陈海贤董梅徐智锋
Owner HANGZHOU HI TECH FINE CHEM
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