A kind of modified melamine rigid foam material and preparation method thereof

A technology of melamine and foaming materials, which is applied in the field of polymer materials, can solve the problems of poor product quality stability, failure to meet the use strength requirements, and insufficient bonding strength of the matrix, so as to reduce the resin cross-linking and curing speed and close the Increased porosity and low water absorption

Active Publication Date: 2022-07-26
HENAN JUNHUA DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Melamine rigid foaming material is a new type of material in the field of external wall insulation developed in recent years. It can achieve the flame retardant effect, and has the characteristics of low thermal conductivity, light weight, low smoke, and environmental protection; however, the various components and parameters in the synthesis and foaming process of melamine resin are relatively strict, and the components are complex and the conditions are changeable. The stability of the product quality is not very good, and the inherent triazine ring structure of melamine makes the foam material brittle, has a high powder drop rate, and the bonding strength with the substrate is not enough. At the same time, it cannot meet the requirements for high strength.

Method used

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  • A kind of modified melamine rigid foam material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 300g of water, 330g of paraformaldehyde and 550g of melamine were added to the reaction kettle, the temperature was raised to 85°C, the pH value of the system was adjusted to 8.0 with triethanolamine, and the reaction was stirred for 45min; 60g of benzoxazine and 80g of polyvinyl butyral were dissolved After 150 g of isobutanol was added to the reaction kettle, the temperature was lowered to 75 ° C, the pH value of the reaction was adjusted to 7.0 with 1% hydrochloric acid, and the melamine prepolymer resin solution was obtained after stirring and reacting for 1.5 h.

[0025] Take 500g of melamine prepolymer resin solution, add 22g of acetic acid, 30g of n-pentane, 26g of sodium dodecylbenzenesulfonate, 15g of tetrafluoroethyl methyl ether, stir evenly, foam in a microwave oven for 5 minutes, and foam The power is 2000W, and then it is moved to an oven for curing at 60°C for 20h to obtain a modified melamine rigid foam material.

Embodiment 2

[0027] 400g of water, 370g of paraformaldehyde and 650g of melamine were added to the reaction kettle, the temperature was raised to 90°C, the pH value of the system was adjusted to 8.5 with triethanolamine, and the reaction was stirred for 60min; 40g of benzoxazine and 60g of polyvinyl butyral were dissolved After 120 g of isobutanol was added to the reaction kettle, the temperature was lowered to 70 ° C, the pH value of the reaction was adjusted to 6.5 with 1% hydrochloric acid, and the melamine prepolymer resin solution was obtained after stirring and reacting for 1.2 h.

[0028] Take 500g of melamine prepolymer resin solution, add 26g of formic acid, 20g of isohexane, 22g of sodium lauryl sulfate, and 16g of tetrafluoroethyl tetrafluoropropyl ether. After stirring evenly, foam it in a microwave oven for 3 minutes. 1600W, and then moved to an oven for curing at 50°C for 24h to obtain a modified melamine rigid foam material.

Embodiment 3

[0030] 350g of water, 300g of paraformaldehyde and 610g of melamine were added to the reaction kettle, the temperature was raised to 82°C, the pH value of the system was adjusted to 9.0 with triethanolamine, and the reaction was stirred for 35min. 90g of benzoxazine and 40g of polyvinyl butyral were dissolved in 110g of isobutanol and added to the reaction kettle together, cooled to 80°C, adjusted to pH 7.5 with 1% hydrochloric acid, stirred and reacted for 1.8h to obtain Melamine prepolymer resin liquid.

[0031] Take 500 g of melamine prepolymer resin solution, add 22 g of oxalic acid, 25 g of methylene chloride, 24 g of fatty alcohol polyoxyethylene ether sodium sulfate, and 18 g of heptafluoroisopropyl methyl ether, stir evenly, foam in a microwave oven for 4 minutes, and let The foaming power was 1800W, and then it was moved to an oven for curing at 70°C for 16h to obtain a modified melamine rigid foam material.

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Abstract

The invention belongs to the technical field of polymer materials, and specifically discloses a modified melamine rigid foam material and a preparation method thereof. 10-35 parts of water, 5-20 parts of isobutanol, 3-10 parts of benzoxazine, and 5-15 parts of polyvinyl butyral. It has the characteristics of high porosity, high strength, good toughness, and high bonding strength between post-processing and matrix.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a modified melamine rigid foam material and a preparation method thereof. Background technique [0002] Melamine rigid foam material is a new type of material in the field of exterior wall thermal insulation developed in recent years. Compared with other rigid thermal insulation materials such as polyurethane, polystyrene, and phenolic resin, it is The flame retardant effect can be achieved at the next level, and it has the characteristics of low thermal conductivity, light weight, low smoke, and environmental protection; however, the control requirements for various components and parameters in the synthesis and foaming process of melamine resin are relatively strict, the components are complex, and the conditions are changeable. As a result, the product quality stability is not very good, and the inherent triazine ring structure of melamine makes the foame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08G12/32C08L61/32C08L29/14C08J9/14
CPCC08G12/40C08G12/32C08J9/141C08J9/145C08J9/147C08J2361/32C08J2429/14C08J2203/14C08J2203/142C08J2203/144
Inventor 汤广斌刘旭王恩伟赵梦溪孙浩杰张昌艳
Owner HENAN JUNHUA DEV
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