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

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Problems solved by technology

However, the research and application of

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0020] Example 1

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

[0022] Step 2: Add 335.5g of polyether polyol (330N) and 29.1g of melamine (MELA) liquid (synthesized in the first step, with a content of 81%) in a four-necked flask, connect the thermometer and stirring paddle, Stir continuously for 1 minute at room temperature; then add 13.2g of 2,4-toluene diisocyanate to the above mixture within 30 seconds, and continue to stir for 10 minutes. The system has an exothermic reaction and the temperature rises rapidly; the temperature of the system will be exothermic. After the temperature drops to 5℃, connect the condenser reflux tube, vacuum for 2 hours under the pressure of -0.1MPa and temperature of 90℃ to r...

Example Embodiment

[0023] Example 2

[0024] The first step: Add 121.6g of formaldehyde, 63g of melamine (MELA) and 0.2g of sodium carbonate to a four-necked flask, mix and stir and heat to 100°C. The mixture turns from turbidity to clear. After 30 minutes of reaction, 61g of ethanolamine is added and stirred for 180 minutes. , The formation of melamine (MELA) liquid (content of 81%).

[0025] Step 2: Add 150g of polyether polyol, 10g of ethylene glycol (4.8% of total weight) and 39.9g of melamine (MELA) liquid (synthesized in the first step, with a content of 81%) in a four-necked flask , Connect the thermometer and stirring paddle, and keep stirring at room temperature for 15 minutes. Then 17.7 g of 2,6-toluene diisocyanate was poured into a four-necked flask within 45 seconds and the stirring continued for 60 minutes, and the temperature rose rapidly. After the temperature drops to 35℃, connect the condensing reflux tube and vacuumize for 3 hours under the conditions of less than -0.2MPa and 120℃...

Example Embodiment

[0026] Example 3

[0027] Step 1: Add 121.6g of formaldehyde, 63g of melamine (MELA) and 0.2g of sodium carbonate in a four-necked flask, mix and stir and heat to 90°C, the mixture turns from turbidity to clear, react for 10 minutes, add 61g of ethanolamine, stir for 120 minutes , The formation of melamine (MELA) liquid (content of 81%).

[0028] The second step: Add 130g of polyether polyol, 10g of propylene glycol (4.7% by weight) and 55.8g of melamine (MELA) liquid (synthesized in the first step, with a content of 81%) in a four-necked flask, then Put a thermometer and a stirring paddle, and stir continuously for 10 minutes at room temperature. Then 24.8 g of diphenylmethane diisocyanate was poured into a four-necked flask within 60 seconds and the stirring continued for 25 minutes, and the temperature rose rapidly. After the temperature drops to 24℃, connect the condensing reflux tube and vacuumize for 2.5 hours under the conditions of less than -0.15MPa and 100℃ to remove the...

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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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