Flame-retardant polyurethane foam preparation method

A technology of polyurethane foam and flame retardant polyol, which is applied in the field of polymer foam materials, can solve the problems of low flame retardant efficiency and large amount of flame retardant addition, and achieve high solid content, good flame retardant effect, and simple operation

Inactive Publication Date: 2018-01-26
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of large amount of flame retardant added in conventional flame retardant polyurethane foam and low flame retardant efficiency, and realize better application of flame retardant polyurethane foam, the invention discloses a preparation method of flame retardant polyurethane foam, which adopts in-situ polymerization The flame retardant polyol was synthesized by directly grafting the flame retardant into the polyol, and the polyurethane foam was prepared by using it as a raw material instead of the traditional polyether polyol, without adding any additional flame retardant during the foaming process , itself has excellent flame retardant properties

Method used

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  • Flame-retardant polyurethane foam preparation method

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Embodiment 1

[0031] In the first step, add 170ml of ethylene glycol into the reaction kettle, adjust the pH of the solution to 10 with potassium hydroxide, and raise the temperature to 70°C;

[0032] In the second step, add 90g of paraformaldehyde, keep the temperature for 10 minutes, and keep the paraformaldehyde depolymerized and dissolved under alkaline conditions;

[0033] In the third step, 187g of benzomelamine was added and reacted for 100min at a pH value of 8.5 and a temperature of 85°C;

[0034] In the fourth step, the pH value of the solution is adjusted to 6 with formic acid, and the condensation and etherification reaction is carried out for 30 minutes;

[0035] Step 5: Adjust the pH value of the solution to 10 with potassium hydroxide, add 28.2 g of phenol, control the reaction temperature at 85° C. and react for 100 minutes to obtain a flame-retardant polyol, which is cooled for later use.

[0036] Take 100 parts of the flame retardant polyol, 1.6 parts of silicone foam sta...

Embodiment 2

[0038] In the first step, add 135ml of glycerol into the reaction kettle, adjust the pH of the solution to 11 with triethanolamine, and raise the temperature to 75°C;

[0039] In the second step, add 90g of paraformaldehyde, keep the temperature for 15 minutes, and keep the paraformaldehyde depolymerized and dissolved under alkaline conditions;

[0040] In the third step, 126 g of melamine was added and reacted for 100 min at a pH value of 9 and a temperature of 85° C.;

[0041] In the fourth step, the pH value of the solution is adjusted to 3 with formic acid, and the condensation and etherification reaction is carried out for 30 minutes;

[0042] Step 5: Adjust the pH value of the solution to 10 with triethanolamine, add 44 g of resorcinol, control the reaction temperature at 85° C. and react for 100 minutes to obtain a flame-retardant polyol, which is cooled for later use.

[0043] Get 100 parts of the flame retardant polyol and 1.8 parts of silicone foam stabilizer, 2 par...

Embodiment 3

[0045] In the first step, add 100ml polyethylene glycol 200 into the reaction kettle, adjust the pH of the solution to 10 with sodium hydroxide, and raise the temperature to 70°C;

[0046] In the second step, add 90g of paraformaldehyde, keep the temperature for 10 minutes, and keep the paraformaldehyde depolymerized and dissolved under alkaline conditions;

[0047]In the third step, add 60g of urea and react for 100min at pH 8.5 and temperature 85°C;

[0048] In the fourth step, the pH value of the solution is adjusted to 4 with formic acid, and the condensation and etherification reaction is carried out for 30 minutes;

[0049] The fifth step is to adjust the pH value of the solution to 10 with sodium hydroxide, add 44 g of hydroquinone, control the reaction temperature at 85° C. and react for 100 minutes to obtain a flame-retardant polyol, which is cooled for later use.

[0050] Take 100 parts of the flame retardant polyol, 1.6 parts of silicone foam stabilizer, 2 parts of...

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Abstract

The invention belongs to the technical field of polymer foam materials, and particularly relates to a flame-retardant polyurethane foam preparation method, which comprises: 1, adding polylol into a reaction kettle, adjusting the pH value to 7-13, and heating to achieve a temperature of 50-90 DEG C; 2, adding paraformaldehyde, maintaining the constant temperature for 10-40 min, and carrying out depolymerization and dissolving on paraformaldehyde under an alkaline condition; 3, adding an amino-based substance, controlling the reaction temperature at 50-100 DEG C, and carrying out a reaction for60-180 min; 4, adjusting the pH value to 2-7, and carrying out a condensation and etherification reaction for 20-50 min; and 5, adjusting the pH value to 7-13, adding a modifier, controlling the reaction temperature at 60-100 DEG C, and carrying out a reaction for 90-200 min to obtain the flame-retardant polyol. According to the present invention, the flame-retardant polyurethane foam material prepared through the preparation method has advantages of high compressive strength, good flame retardant effect and the like, and has good application prospects in industry, daily life, architecture andother external wall thermal insulation material markets.

Description

technical field [0001] The invention belongs to the technical field of polymer foam materials, in particular to a preparation method of flame-retardant polyurethane foam. Background technique [0002] Polyurethane foam has the advantages of light weight, good thermal insulation and high specific strength, and is widely used in industry, daily life, construction and other fields. However, pure polyurethane foam is extremely flammable in the air because of its porous and low density in its apparent structure. Therefore, the limiting oxygen index of polyurethane foam is low, only about 17%, and it is a flammable material. In recent years, due to frequent fires, resulting in a large number of casualties, the demand for flame retardant materials is increasing. At present, most flame retardant materials use halogenated flame retardants or add metal hydroxide flame retardants to achieve the purpose of fire prevention. Since halogenated flame retardants will emit toxic gases that s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/54C08G12/42C08G12/40C08G14/12C08G14/10C08J9/08C08G101/00
Inventor 陈日清李双王春鹏储富祥
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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