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Preparation method for melamine formaldehyde resin closed-cell foam

A technology of melamine formaldehyde and melamine, 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 effect of solving large brittleness, improving water resistance and simple operation.

Inactive Publication Date: 2014-07-30
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 solution into the reactor, stir with a stirrer, add a small amount of caustic soda (40%) to adjust the pH to 10, add 5 grams of triethanolamine (analytical pure), and at the same time raise the temperature to 50 degrees with a temperature controller, add 1052 grams of 99% melamine (high-grade product), add 200 grams of phenol and 100 grams of dicyandiamide to react for 60 minutes, vacuum dehydrate, keep 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-mentioned solid resin to 10 grams of viscosity-adjusting agent ethylene glycol, and 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 Demeishi Chuang Co., Ltd.), 10 grams of blowing agent n-pentane, and vigorously stirred to mix the resin for 5 ...

Embodiment 2

[0029] Put 2527 grams of 37% formaldehyde solution into the reactor, stir with a stirrer, add a small amount of caustic soda (40%) to adjust the pH to 10, add 5 grams of triethanolamine (analytical pure), and at the same time raise the temperature to 50 degrees with a temperature controller, add 1052 grams of 99% melamine (superior product), add 200 grams of benzomelamine and 100 grams of dicyandiamide, after one hour of reaction, start dehydration below 100 degrees until the solid content reaches 87.7%, cool to obtain modification Melamine formaldehyde solid resin.

[0030] Add 200 grams of the above solid resin to 10 grams of diethylene glycol and 10 grams of ethylene glycol for viscosity adjustment. 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.), 5 grams of foaming agent dichloroethane, stir well. The mixture is foamed in a microwave, an...

Embodiment 3

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

[0034] Add 200 grams of the above-mentioned solid resin to 10 grams of viscosity-adjusting agent 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 silicone 580# 10 grams (Jiangsu Yake Technology Co., Ltd.), 5 grams of foaming agent cyclohexane, stirred even...

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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 which can be used for heat preservation of various building exterior walls, and belongs to the field of new materials. Background technique [0002] Among all kinds of organic resin foam materials, melamine formaldehyde resin foam materials have good flame retardancy, thermal stability, low smoke, and high aging resistance. In recent years, domestic colleges and universities have paid more and more attention to the development of melamine-formaldehyde resin foam. [0003] From domestic and foreign perspectives, there are German BASF, Japanese Inoue, Henan Zhongyuan Dahua, and Sichuan Petrochemical currently producing melamine-formaldehyde resin foam materials. The main types of melamine-formaldehyde resin foam produced by them are melamine-formaldehyde resin open-cell foam. This melamine-formaldehyde resin open-cell foam has been successfully used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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