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Method for preparing fire-retardant polyether by cyanuramide

A technology of melamine and flame retardant polyether is applied in the field of preparation of flame retardant polyether, which can solve undisclosed problems and achieve the effects of good uniformity, mechanical strength, good stability and good flame retardant performance.

Inactive Publication Date: 2005-02-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research and application of such methods have not been published yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Add 121.6g of formaldehyde, 63g of melamine (MELA) and 0.2g of sodium carbonate into a four-neck flask, mix and stir, and heat to 80°C. The mixture turns from turbid to clear. After 5 minutes of reaction, add 61g of ethanolamine, and stir for 30 minutes. , Generate melamine (MELA) liquid (content is 81%).

[0022] Second step: add 335.5g of polyether polyol (330N) and 29.1g of melamine (MELA) liquid (the first step has been synthesized, content is 81%) in four-necked flask, connect thermometer and stirring blade, Stir continuously at room temperature for 1 minute; then add 13.2 g of 2,4-toluene diisocyanate to the above mixture within 30 seconds, and continue stirring for 10 minutes, an exothermic reaction occurs in this system, and the temperature rises rapidly; After lowering to 5°C, connect the condensing reflux tube, vacuumize for 2 hours under the conditions of -0.1MPa and 90°C, remove the residual monomers, and obtain the solid content, that is, isocyanate...

Embodiment 2

[0024] Step 1: Add 121.6g of formaldehyde, 63g of melamine (MELA) and 0.2g of sodium carbonate into a four-neck flask, mix and stir and heat to 100°C. The mixture turns from turbid to clear. After 30 minutes of reaction, add 61g of ethanolamine and stir for 180 minutes. , Generate melamine (MELA) liquid (content is 81%).

[0025] The second step: add 150g of polyether polyol, 10g of ethylene glycol (4.8% of total weight) and 39.9g of melamine (MELA) liquid (the first step has been synthesized, the content is 81%) in the four-necked flask , connected to a thermometer and a stirring paddle, and stirred continuously at room temperature for 15 minutes. Then 17.7 g of 2,6-toluene diisocyanate was poured into the four-necked flask within 45 seconds and stirred for 60 minutes, and the temperature rose rapidly. After the temperature drops back to 35°C, connect the condensing reflux pipe, vacuumize for 3 hours under the condition of less than -0.2MPa and 120°C, and remove the residual...

Embodiment 3

[0027] Step 1: Add 121.6g of formaldehyde, 63g of melamine (MELA) and 0.2g of sodium carbonate into a four-neck flask, mix and stir, and heat to 90°C. The mixture turns from cloudy to clear. After 10 minutes of reaction, add 61g of ethanolamine, and stir for 120 minutes. , Generate melamine (MELA) liquid (content is 81%).

[0028] Second step: add 130g polyether polyols, 10g propylene glycol (accounting for 4.7% of total weight) and 55.8g melamine (MELA) liquid (the first step has been synthesized, content is 81%) in four-necked flask, then With a thermometer and stirring paddle on, stir continuously at room temperature for 10 minutes. Then 24.8 g of diphenylmethane diisocyanate was poured into the four-necked flask within 60 seconds and stirred for 25 minutes, and the temperature rose rapidly. After the temperature drops to 24°C, connect the condensing reflux pipe, vacuumize for 2.5 hours under the condition of less than -0.15MPa and 100°C, and remove the residual monomers t...

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PUM

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Abstract

A fire resisting polyether is prepared from cyanamine trimers by: mixing and stirring cyanamine solids and formaldehyde, heating to 80-100deg.C,reacting for 5-30 minutes, adding alcohol amine and agitating, reacting 30-180 minutes to produce cyanamine trimer solution, making the solution mol ratio of cyanamine trimer :formaldehyde :alcohol amine being = 1:3:2;then, mixing cyanamine trimer solution gotten said above with polyether polyol, Stirring for 1-15 minutes, adding isocyanate ester, stirring 10-60 for minutes, cooling to 5-35deg.C, evacuating to vacuum at -0.2--0.1 MPa and at 90-120deg.C conditions, and removing residual monomers to get fire-resisting polyether. The products have high oxygen index, without containing halogen, phosphorus, antimony, etc, good fluidity, low acid value, less water content, little smoking, good uniformity and mechanics intensity, improved fire resisting effect.

Description

technical field [0001] The invention relates to a preparation method of a flame-retardant polyether, in particular to a method for preparing a novel flame-retardant polyether, that is, a structural flame retardant, by using melamine (MELA). Background technique [0002] Polyurethane foam (PUF) is the most widely used polyurethane product and is widely used in furniture, automotive industry, construction, transportation and thermal insulation materials. However, PUF is extremely flammable in the air, and produces a large amount of toxic gas and smoke when burning, which has extremely bad effects on human health and the environment. Over the past few years, foreign countries have paid great attention to the flame retardant of PUF, and promulgated Nuoqian's relevant PUF flame retardant regulations and flame retardant requirements. For example, in Western Europe, FPUF used in automobiles must meet the Motor Vehicle Safety Standard (MVSS ) 302; in the U...

Claims

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Application Information

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IPC IPC(8): C08G65/48C08K5/3495
Inventor 修玉英谢菲菲罗钟瑜
Owner SOUTH CHINA UNIV OF TECH
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