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Melamine formaldehyde resin and preparation method of melamine formaldehyde resin foam board

A technology of melamine and formaldehyde resin, which is applied in the field of melamine formaldehyde resin production, can solve the problems of poor heat resistance and fire resistance, non-extensible water absorption, and low mechanical strength, and achieve excellent sound absorption, high mechanical strength, and water absorption low effect

Inactive Publication Date: 2012-08-22
HENAN YONGWEI SECURITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of existing foam boards such as poor heat resistance and fire resistance, easy pulverization, low mechanical strength, brittleness, no extensibility and high water absorption, the present invention provides a melamine formaldehyde resin and its Melamine formaldehyde foam board for flame retardant and thermal insulation, the melamine formaldehyde foam board for flame retardant and thermal insulation not only has good fireproof performance, but also has light weight, heat insulation, sound insulation, high specific strength, low thermal conductivity, high mechanical strength and low water absorption and other characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Preparation of melamine-formaldehyde resin system: Add melamine to paraformaldehyde in a molar ratio of 1.0:3.0 into the reactor, add sodium hydroxide within 15 minutes, adjust the pH value to 8.5, start to heat up, and the temperature rises to 70 °C, add polyvinyl alcohol. Continue heating reaction, measure cloud point after reacting for 30 minutes. After the cloud point appears, dehydrate and check the viscosity. When the viscosity reaches 150 mPa·s, add polyamide, react for another 50 minutes, and discharge.

[0019] Preparation of melamine-formaldehyde board: Add 100 parts of the above-mentioned melamine-formaldehyde resin, 12 parts of foam stabilizer and 7 parts of foaming agent into the mixing tank, stir, and after stirring evenly, use a high-viscosity pump to mix the The resin raw material is transported to the mixing storage tank (this material is called A material). Cool the raw material to below 18°C. Weigh 8 parts of composite curing agent (mater...

Embodiment 2

[0021] Example 2 Preparation of melamine-formaldehyde resin system: Add melamine and paraformaldehyde into the reaction kettle at a molar ratio of 1.0:2.6, add sodium hydroxide within 5 minutes, adjust the pH value to 8.5, start to heat up, and when the temperature rises to 65°C , add polyvinyl alcohol. Continue heating reaction, measure cloud point after reacting for 30 minutes. After the cloud point appears, dehydrate and check the viscosity. When the viscosity reaches 140 mPa·s or more, add polyamide, react for another 50 minutes, and discharge.

[0022] Preparation of melamine-formaldehyde board: Add 100 parts of the above-mentioned melamine-formaldehyde resin, 1 part of foam stabilizer and 2 parts of foaming agent into the mixing tank, stir, and after stirring evenly, use a high-viscosity pump to mix the The resin raw material is transported to the mixing storage tank (this material is called A material). Cool the raw material to below 18°C. Weigh 5 parts of composite ...

Embodiment 3

[0024] Example 3 Preparation of melamine-formaldehyde resin system: Add melamine to paraformaldehyde in a molar ratio of 1.0:2.8 into the reactor, add sodium hydroxide within 5 minutes, adjust the pH value to 9.0, start to heat up, and the temperature rises to 70 °C, add polyvinyl alcohol. Continue heating reaction, measure cloud point after reacting for 30 minutes. Dehydrate after the cloud point appears, and check the viscosity. When the viscosity reaches 160 mPa·s or more, add polyamide, react for another 35 minutes, and discharge.

[0025] Preparation of melamine-formaldehyde board: Add 100 parts of the above-mentioned melamine-formaldehyde resin, 3 parts of foam stabilizer and 2 parts of foaming agent into the mixing tank, stir, and after stirring evenly, use a high-viscosity pump to mix the The resin raw material is transported to the mixing storage tank (this material is called A material). Cool the raw material to below 18°C. Weigh 7 parts of composite curing agent ...

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Abstract

The invention relates to melamine formaldehyde resin and a preparation method of an antiflaming and thermal-insulation melamine formaldehyde resin foam board. The method includes: proportionally mixing melamine with paraformaldehyde, adjusting pH (potential of hydrogen) to 8.0-10.0 by addition of sodium hydroxide, heating to 65-80 DEG C prior to adding polyvinyl alcohol, continuing heating reaction, dehydrating when reaction liquid has cloud points, adding polyamide when the viscosity of the reaction liquid is larger than or equal to 140mPa s, continuing reaction to prepare the melamine formaldehyde resin, adding foam stabilizer and foaming agent with uniform mixing, uniformly mixing the uniformly mixed foam stabilizer and foaming agent with composite curing agent, spraying mixture on a nonwoven fabric interface on a glue spraying platform, and subjecting the nonwoven fabric interface to heating, foaming, curing and solidification so that the board is molded and prepared. The melamine formaldehyde resin foam board has the advantages of excellent sound absorption, flame retardance, thermal insulation, resistance to heat and humidity, high specific strength, low thermal conductivity factor, high mechanical strength and low water absorption, can be widely applied to the fields of thermal insulation, flame retardance, sound absorption, buffer and the like of outer walls of buildings, and can greatly promote development of the field of foam thermal-insulation materials.

Description

technical field [0001] The invention relates to the technical field of melamine-formaldehyde resin production, in particular to a method for preparing a melamine-formaldehyde resin and a foam board for flame-retardant and thermal insulation thereof. Background technique [0002] Melamine formaldehyde resin is a commonly used resin. "Chemical Production Flow Diagram (Volume 2)" (Second Edition, 1988, Chemical Industry Press) pages 376 to 377 record its existing synthesis methods, raw materials and resins. use etc. The existing synthesis method and product performance of this type of melamine-formaldehyde resin have the following defects: poor flame retardancy, poor impact resistance, high residual formaldehyde, and the like. [0003] At present, the known foam boards are mainly polyvinyl chloride foam, polyurethane foam and phenolic foam. The main disadvantages of polyvinyl chloride foam and polyurethane insulation materials are poor heat resistance and fire resistance, lar...

Claims

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Application Information

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IPC IPC(8): C08G12/40B29C44/20
Inventor 任太平刘建庄徐明华刘高峰
Owner HENAN YONGWEI SECURITY
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