Method for synthesizing environment-friendly type urea-formaldehyde plastics resin

A synthesis method and resin synthesis technology are applied in the synthesis field of environmentally friendly electric jade powder resin, which can solve the problems that electric jade powder products do not conform to green environmental protection, affect the physical and mental health of operators, pollute the atmosphere, etc., so as to protect physical and mental health and reduce The effect of single consumption and quality assurance

Inactive Publication Date: 2008-06-18
滁州市十扬环保塑木科技有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] Excessive formaldehyde not only wastes resources, pollutes the atmosphere, but also seriously affects the physical and men

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] (1) Synthesis of urea-formaldehyde resin

[0019] 1. Put 180kg of 40% formaldehyde into the reactor, adjust the pH to 8.5 with urotropine or sodium carbonate solution under stirring, then add 123kg of 98% urea, and react when the temperature is raised to 85°C until the reaction liquid is milky white and thick. The viscosity of the resin is 6 seconds, and the temperature is lowered. At the same time, add 5kg of water with a pH of about 7 and a temperature of 80°C. After stirring, the milky white thick resin is discharged and sent to the kneading section of the jade powder processing.

[0020] 2. The feeding and pH adjustment are the same as in Example 1. The temperature is raised to 85°C and reacted for 1 hour, then the pH of the reaction solution is adjusted to 5.5 with 50% acetic acid, and the reaction is continued at 85°C until the reaction solution is milky white thick liquid, and sodium carbonate solution is used at the same time. Adjust pH 7.5, resin viscosity for 7 se...

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PUM

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Abstract

A synthetic method of environment-friendly urea moulding compound resin relates to urea formaldehyde and the synthetic method of modifying urea formaldehyde by tripolycyanamide. Firstly, a ph8-9 formaldehyde solution added with urea or urea and tripolycyanamide reacts under the temperature of 60 to 90 DEG C and when the reaction liquid turns into ivory-white thick liquid, water with the basically same pH value of the reaction liquid is added for even mixing or reaction under the temperature of 70 to 90 DEG C for 0.5 to 1.5 hours; then organic acid is used to adjust pH to 5-6 and further reaction goes on under the temperature of 70 to 90 DEG C; when the reaction liquid turns into ivory-white thick liquid; afterwards, sodium carbonate solution is used to adjust the pH of the reaction liquid to 7-8 and water with the basically the same pH value of the reaction liquid is added for even mixing; finally, the ivory-white thick resin liquid is sent to the sequent procedures and processed into the urea moulding compound. In the method, excessive formaldehyde is converted into resin as much as possible, thus reducing the air pollution and protecting workers health; at the same time, the formaldehyde residue of the urea moulding compound is greatly reduced, so the present invention is worthy the name of environment-friendly process compared with the traditional process.

Description

1. Technical field [0001] The invention relates to a method for preparing a resin, in particular to a method for synthesizing an environment-friendly electric jade powder resin. 2. Background technology [0002] Electric jade powder is the collective name of the products obtained from urea-formaldehyde resin and modified urea-formaldehyde resin after adding various fillers and additives, kneading, drying, crushing, ball milling and sieving. The fillers and additives include cellulose, glass fiber, asbestos, mica powder, quartz powder, calcium carbonate, talcum powder, dolomite powder, barium sulfate, stearate, coloring agent, etc., and are added according to the needs of the application. Resin can be used in adhesives, and electric jade powder is mainly used in electrical casings, switches, sockets, telephone parts, bottle caps, buttons, tableware, etc. [0003] Urea-formaldehyde resin is a traditional resin, which is formed by condensation polymerization of urea and formal...

Claims

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Application Information

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IPC IPC(8): C08G12/38
Inventor 杨素银
Owner 滁州市十扬环保塑木科技有限公司
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