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Preparation method for melamine formaldehyde resin closed-cell foam

A technology of melamine formaldehyde and melamine, which is applied in the field of new materials, can solve the problems of high open porosity, poor heat insulation effect, easy powdering, etc., and achieves the effects of solving large brittleness, improving water resistance and simple operation.

Inactive Publication Date: 2013-01-30
NANTONG ZIXIN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Analysis of its main reason is that the high open cell ratio of melamine formaldehyde resin foam causes its thermal insulation effect to be inferior to polyurethane foam, polystyrene foam, phenolic resin foam and other materials, and melamine formaldehyde resin foam also has the shortcoming of being easy to pulverize. The strength of melamine formaldehyde resin foam can not meet the basic requirements of external wall insulation materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 2527 grams of 37% formaldehyde aqueous solution into the reactor, stir with a stirrer, add a small amount of caustic soda (40%) to adjust the pH 10, add 5 grams of triethanolamine (analytical purity), and use a temperature controller to increase the temperature to 50 degrees. 99% melamine (superior grade) 1052 grams, add 200 grams of phenol and 100 grams of dicyandiamide to react for 60 minutes, vacuum dehydration, maintain the dehydration temperature below 100 degrees, until the solid content reaches 89.2%, cool to obtain modified melamine Formaldehyde solid resin.

[0026] Add 200 grams of the above solid resin to 10 grams of viscosity adjuster ethylene glycol. After dissolving, add 20 grams of curing agent phosphoric acid, 5 grams of emulsifier sodium lauryl sulfate, and 10 grams of foam stabilizer silicone AK8805 (Nanjing De Mercer Chuang Co., Ltd.), 10 grams of n-pentane as the blowing agent, and vigorously stir the mixed resin for 5 minutes. Put it in the microw...

Embodiment 2

[0029] Put 2527 grams of 37% formaldehyde aqueous solution into the reactor, stir with a stirrer, add a small amount of caustic soda (40%) to adjust the pH 10, add 5 grams of triethanolamine (analytical purity), and at the same time use a temperature controller to heat up to 50 degrees, add 99% melamine (superior grade) 1052 grams, add 200 grams of benzoic melamine, add 100 grams of dicyandiamide, after reacting for one hour, start dehydration below 100 degrees, until the solid content reaches 87.7%, cool to get modified Melamine formaldehyde solid resin.

[0030] Add 200 grams of the above solid resin to 10 grams of the viscosity adjuster diethylene glycol and 10 grams of ethylene glycol. After dissolving, add 20 grams of curing agent formic acid, 5 grams of emulsifier sodium lauryl sulfate, and foam stabilizer silicone 580. # 5 grams (Jiangsu Yake Technology Co., Ltd.), foaming agent dichloroethane 5 grams, stir evenly. The mixture is foamed in a microwave, and after reaching ...

Embodiment 3

[0033] Put 2527 grams of 37% formaldehyde aqueous solution into the reactor, stir with a stirrer, add a small amount of caustic soda (40%) to adjust the pH 10, add 10 grams of triethanolamine (analytical purity), and at the same time use a temperature controller to heat up to 50 degrees, add 99% melamine (superior grade) 1052 grams, add 200 grams of methyl melamine, polyether 204# 100 grams [Nantong Lvyuan New Material Co., Ltd.], after one hour of reaction, it starts to be dehydrated below 100 degrees, and the resin solid content reaches 90.5%, cooling, get modified melamine formaldehyde solid resin.

[0034] Add 200 grams of the above solid resin to 10 grams of viscosity adjuster butanol and 10 grams of butanolamine. After dissolving, add 5 grams of curing agent acetic acid, 10 grams of emulsifier sodium lauryl sulfate, and foam stabilizer organic silicon 580# 10 grams (Jiangsu Yake Technology Co., Ltd.), and 5 grams of cyclohexane as a blowing agent. Stir evenly, put it in an ...

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PUM

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Abstract

The present invention discloses a preparation method for melamine formaldehyde resin closed-cell foam. The preparation method comprises the following steps: introducing a modifier to a melamine formaldehyde resin synthesis process to carry out copolymerization, and carrying out a dehydration treatment on the synthesized resin to obtain a modified melamine formaldehyde solid resin with a solid content of more than 85%; adding a viscosity adjusting agent, dissolving the solid resin, respectively adding a curing agent, a foam stabilizer, an emulsifier and a foaming agent, and uniformly stirring; placing the resulting mixture in an oven or a microwave oven to carry out foaming to achieve a predetermined density; and placing the resulting material in the oven or the microwave oven to carry out aging to obtain the melamine formaldehyde foam with a closed-cell rate of more than 90%. The melamine formaldehyde resin closed-cell foam produced by the preparation method has excellent mechanical strength and flame retardant property, and can be applicable for building exterior wall thermal insulation.

Description

Technical field [0001] The invention relates to a preparation method of a melamine formaldehyde resin closed-cell foam material that can be used for heat preservation of various exterior walls of buildings, and belongs to the field of new materials. Background technique [0002] Among various organic resin foam materials, melamine formaldehyde resin foam materials have good flame retardant properties, thermal stability, low smoke generation, and high aging resistance. In recent years, domestic colleges and universities have paid increasing attention to the development of melamine formaldehyde resin foam. [0003] From a domestic and international perspective, the current manufacturers of melamine formaldehyde resin foam materials include German BASF, Japan Inoue, Henan Zhongyuan Dahua, and Sichuan Petrochemical. The main varieties of melamine formaldehyde resin foam produced by them are melamine formaldehyde resin open-cell foam. This kind of melamine formaldehyde resin open-cell ...

Claims

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Application Information

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IPC IPC(8): C08L61/34C08L61/32C08L61/28C08J9/14
Inventor 杨斌峰朱国清沈铁清马立新姚尧
Owner NANTONG ZIXIN IND
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