Method for synthesizing environment-friendly type urea-formaldehyde plastics resin
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A technology of resin synthesis and synthesis method, which is applied in the synthesis field of environmentally friendly electric jade powder resin, 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: 2010-12-08
滁州市十扬环保塑木科技有限公司
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[0007] Excessive formaldehyde not only wastes resources, pollutes the atmosphere, but also seriously affects the physical and mental health of operators, and also makes electric jade powder products not meet the requirements of green environmental protection
Method used
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[0018] (1) Synthesis of urea-formaldehyde resin
[0019] 1. Put 180kg of 40% formaldehyde into the reaction kettle, 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 rises to 85°C until the reaction liquid is milky white and thick Liquid, resin viscosity for 6 seconds, lower the temperature, and add 5kg of water with a pH value of about 7 and a temperature of 80°C at the same time, after stirring evenly, discharge the milky white thick resin, and send it to the kneading section of jade powder processing.
[0020] 2. Feeding and pH adjustment are the same as in Example 1, heat up to 85°C for 1 hour, then use 50% acetic acid to adjust the pH of the reaction solution to 5.5, continue to react at 85°C until the reaction solution is a milky white thick liquid, and at the same time use sodium carbonate solution Adjust the pH to 7.5, resin viscosity for 7 seconds, cool down, and finally add 10k...
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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 basicallysame 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 liquidto 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 intothe 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...
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