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Dicyandiamide-modified flame-retardant polyether polyol preparation method, and prepared flame-retardant polyether polyol and application thereof

A polyether polyol, flame retardant polyether technology, applied in the application field of the polyurethane field, can solve the problems of large smoke, restriction, toxic gas, etc., and achieve the effects of low smoke generation, increased compatibility, and high oxygen index

Active Publication Date: 2014-01-29
江苏钟山新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although phosphorus-containing flame retardants have relatively high efficiency, they will produce relatively large smoke and a large amount of corrosive and toxic gases when burned, which is also the main cause of fatal fires, so the requirements are relatively high. Phosphorus-containing flame retardants are also restricted

Method used

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  • Dicyandiamide-modified flame-retardant polyether polyol preparation method, and prepared flame-retardant polyether polyol and application thereof
  • Dicyandiamide-modified flame-retardant polyether polyol preparation method, and prepared flame-retardant polyether polyol and application thereof
  • Dicyandiamide-modified flame-retardant polyether polyol preparation method, and prepared flame-retardant polyether polyol and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 77g of formaldehyde aqueous solution (37%), 40g of dicyandiamide, and 19g of water into a three-necked flask equipped with a thermometer and a condenser, stir well, adjust the pH value to 10 with sodium methoxide, raise the temperature to 90°C, react for 4 hours, add poly Ether polyol (1618A provided by Jiangsu Zhongshan Chemical Co., Ltd., the same below) 176g, heat up to 100°C, react for 5h, then heat up to 140-150°C, vacuumize to -0.1MPa, and distill under reduced pressure for 1-2 hours to remove Remove small molecular substances and cool to obtain dicyandiamide-modified flame-retardant polyether polyol. The viscosity is 4000mPa.s, and the oxygen index of the flexible foam obtained by foaming the polyether is 28.

Embodiment 2

[0038] Add 77g (37%) formaldehyde aqueous solution (37%), 40g dicyandiamide, and 19g water into a three-necked flask equipped with a thermometer and a condenser, stir well, adjust the pH value to 9 with sodium methoxide, raise the temperature to 90°C, react for 4 hours, add poly Ether polyol (1618A) 217g, heat up to 100°C, react for 5h, heat up to 140-150°C, vacuumize to -0.1MPa, remove small molecules by distillation under reduced pressure for 1-2 hours, cool to obtain dicyandiamide modification flame retardant polyether polyol. The viscosity is 3000mPa.s, and the oxygen index of the flexible foam obtained by foaming the polyether is 26.

Embodiment 3

[0040]Add 77g (37%) of formaldehyde aqueous solution (37%), 40g of dicyandiamide, and 19g of water into a three-necked flask equipped with a thermometer and a condenser, stir well, adjust the pH value to 8 with sodium methoxide, raise the temperature to 95°C, react for 4 hours, add poly Ether polyol (1618A) 217g, heat up to 90°C, react for 5h, heat up to 140-150°C, evacuate to -0.1MPa, distill under reduced pressure for 1-2 hours to remove small molecular substances, cool to obtain dicyandiamide modified flame retardant polyether polyol. The viscosity is 3500mPa.s, and the oxygen index of the flexible foam obtained by foaming the polyether is 26.

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Abstract

The invention relates to a preparation method of dicyandiamide-modified flame-retardant polyether polyol. According to the invention, in a three-neck flask, solid dicyandiamide, a formaldehyde water-solution and water are added according to a certain ratio; the materials are mixed and stirred; an alkaline pH regulator is added, such that the pH value is regulated to 7-10; the temperature is increased to 70-100 DEG C, and a reaction is carried out for 1-6h, such that a dicyandiamide methylolated solution is obtained, wherein a molar ratio of dicyandiamide to formaldehyde is 1:1-3; polyether polyolthe is added into the obtained dicyandiamide methylolated solution, and the mixture is well mixed by stirring; the temperature is increased to 80-110 DEG C, and a reaction is carried out for 2-8h; the temperature is increased to 100-170 DEG C, and residual monomer and water are removed under a vacuum condition with gauge pressure of -0.2 to -0.1MPa, such that phosphorus-free halogen-free dicyandiamide-modified flame-retardant polyether polyol can be obtained. Polyurethane foamed plastic prepared by using the dicyandiamide-modified flame-retardant polyether polyol provided by the invention has the advantages of low smoke emission, high oxygen index, good safety, and environment friendliness. Therefore, requirement of material flame retardant property and environment friendliness of the current world can be satisfied.

Description

technical field [0001] The invention relates to the preparation of a dicyandiamide-modified phosphorus-halogen-free flame-retardant polyether polyol and its application in the field of polyurethane. Background technique [0002] Polyurethane refers to a polymer containing a urethane chain segment (-NH-CO-O-) in its molecular structure. Polyurethane materials are currently one of the most widely used polymer materials in the world and are known as "the fifth largest "Plastic", has good heat insulation, insulation, high specific strength, oil resistance, cold resistance, moisture resistance and dimensional stability, and is widely used in many fields of the national economy. However, polyurethane materials are flammable in the air, and the oxygen index of ordinary flexible foam plastics is only 17, and a large amount of smoke and toxic gases are produced when burned. In recent years, foreign polyurethane flexible foam flame retardant technology has received widespread attenti...

Claims

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Application Information

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IPC IPC(8): C08G65/00C08G18/50
Inventor 王秋英申宝兵陈玉娟朱岑
Owner 江苏钟山新材料有限公司
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