Hard closed melamine foam and preparing method thereof

A technology of closed-cell melamine and foam, which is applied in the field of material science and processing, can solve problems such as flammability and heat resistance, and achieve the effects of simple process, low production cost, and easy popularization and application

Active Publication Date: 2016-06-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these foam materials are easy to burn and have poor heat resistance, so they are not suitab

Method used

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  • Hard closed melamine foam and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A rigid closed-cell melamine foam, the preparation method of which comprises the following steps:

[0024] (1) add melamine and high-concentration formaldehyde solution (mass concentration is 70%) in the reactor, adopt hexamethylenetetramine to adjust the solution to be weakly alkaline pH is 7.5, raise temperature to 60 ℃ simultaneously, at 200r Under the mechanical stirring effect of / min, the two are slowly reacted for 40min; the molar ratio of melamine and high-concentration formaldehyde solution is 1:3;

[0025] (2) when the solution is clear and transparent, the pH value of the reaction solution is adjusted by using diisoolamine to be 8.5, and the temperature is raised to 80°C and then the reaction is incubated for 70min;

[0026] (3) When the resin viscosity is 1400mPa·s, measure the water tolerance of the resin, when the water tolerance reaches 1.8, stop the reaction by cooling down, cool down to 35°C, add sodium citrate, stir evenly, and place it in an ice-water...

Embodiment 2

[0031] A rigid closed-cell melamine foam, the preparation method of which comprises the following steps:

[0032] (1) add melamine and high-concentration formaldehyde solution (mass concentration is 50%) in the reactor, adopt hexamethylenetetramine to adjust the solution to be weakly alkaline pH is 7, raise temperature to 60 ℃ simultaneously, at 200r Under the mechanical stirring effect of / min, the two are slowly reacted for 40min; the molar ratio of melamine and high-concentration formaldehyde solution is 1:3;

[0033] (2) when the solution is clear and transparent, then use 30wt% NaOH solution to adjust the pH value of the reaction solution to 9, and after raising the temperature to 90°C, carry out the insulation reaction for 80min;

[0034] (3) When the resin viscosity is 1670mPa·s, measure the water tolerance of the resin, when the water tolerance reaches 2.0, stop the reaction by cooling down, cool down to 35℃, add the stabilizer sodium citrate, stir evenly, and place it...

Embodiment 3

[0038] A rigid closed-cell melamine foam, the preparation method of which comprises the following steps:

[0039] (1) adding melamine and high-concentration formaldehyde solution (mass concentration is 60%) in the reactor, using diisoolamine to adjust the solution to be weakly alkaline pH is 8, and raising the temperature to 65 ° C simultaneously, at 200r / min Under the action of mechanical stirring, make the two react slowly for 30min; the molar ratio of melamine and high-concentration formaldehyde solution is 1:3;

[0040] (2) when the solution is clear and transparent, then use diisoolamine to adjust the pH value of the reaction solution to 8.5, and carry out the insulation reaction for 90min after raising the temperature to 65°C;

[0041] (3) When the resin viscosity is 1920mPa·s, the water tolerance of the resin is measured. When the water tolerance reaches 2.3, the reaction is terminated by lowering the temperature. The temperature is lowered to 35°C, and the stabilizer s...

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PUM

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Abstract

The invention discloses hard closed melamine foam and a preparing method thereof. The method comprises the steps of making melamine react with high-concentration formaldehyde solution; after reaction proceeds to a certain extent, adding a stabilizer to prepare expandable melamine resin high in solid content with the ice-water bath method; finally, mixing the expandable melamine resin with a surface active agent, a curing agent and a foaming agent, and placing the mixture in a mold for microwave or oven foaming to obtain the hard closed melamine foam. The hard closed melamine foam is small in diameter and density, high in flame retardant property, low in heat conductivity coefficient and high in compression strength. The preparing method is creative, and preparing steps are simple and convenient to implement.

Description

technical field [0001] The invention relates to a simple preparation method for flame-retardant, heat-insulating, and heat-insulating melamine closed-cell foam, and more particularly includes preparation of an expandable resin required for closed-cell foam and determination of a foaming process technology, belonging to the fields of material science and processing . Background technique [0002] Melamine foam, commonly known as melamine foam, is a new type of flame retardant and environmentally friendly material, which is not easy to burn. It can reach the national B1 standard without adding any flame retardant. Due to the large degree of molecular crosslinking and the existence of a stable triazine ring structure in the macromolecules, the melamine foam can maintain stable physical properties in a wide temperature range, high temperature resistance, and can be used at an ambient temperature of 150 ° C for a long time. use below. In addition, the raw materials are abundant...

Claims

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Application Information

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IPC IPC(8): C08G12/32C08J9/14C08L61/28
CPCC08G12/32C08J9/141C08J2361/28C08L61/28C08L2201/02C08L2201/08C08L2203/14
Inventor 孙洁魏晴晴钱坤俞科静卢雪峰
Owner JIANGNAN UNIV
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