Method for preparing hydrophobic melamine foam

A melamine and foam technology, applied in the coating and other directions, can solve the problems of poor thermal insulation and sound absorption, affecting the use value, easy to increase the density, etc., and achieve the effects of reducing water absorption, good elasticity and convenient operation.

Inactive Publication Date: 2016-04-20
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned patents are all process-based methods, and there is no special improvement for the water absorption of the foam. In a humid environment, the foam will absorb moisture, resulting in damage to the structure, poor thermal insulation and sound absorption performance, and easy to increase the density during use. , affecting its use value

Method used

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  • Method for preparing hydrophobic melamine foam

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Effect test

Embodiment 1

[0018] A kind of preparation method of water-repellent melamine foam, it is characterized in that comprising the following steps:

[0019] (1) Mix melamine and formaldehyde at a molar ratio of 1:2, then react at 80°C for 30 minutes to obtain a precondensate with a viscosity of 14000mPa.s, mix the precondensate with hardener, nonionic surfactant, foaming agent, The light stabilizer and deionized water are mixed to form a foaming liquid with a viscosity of 8000mPa.s. The foaming liquid is foamed at a temperature of 40~70°C formed by microwave radiation with a power of 20kw for 1 minute to form a foam body, and the foam body is heated at a temperature of 80°C. Curing for 7 minutes, and then annealing for 25 minutes under hot air conditions at 120°C to obtain a semi-finished melamine foam;

[0020] (2) Add 3 parts by mass of dimethyl silicone oil with a number average molecular weight of 5000 into 15 parts by mass of plasma water, hydrolyze for 3 hours, then add 4 parts by mass of...

Embodiment 2

[0025] A kind of preparation method of water-repellent melamine foam, it is characterized in that comprising the following steps:

[0026] (1) Mix melamine and formaldehyde at a molar ratio of 1:5, and then react at 95°C for 45 minutes to obtain a precondensate with a viscosity of 16000mPa.s. Mix the precondensate with hardener, nonionic surfactant, foaming agent, The light stabilizer and deionized water are mixed to form a foaming liquid with a viscosity of 11000mPa.s. The foaming liquid is foamed at a temperature of 70°C formed by microwave radiation with a power of 30kw for 3 minutes to form a foam, and the foam is cured at a temperature of 120°C for 25 minutes, and then annealed for 60 minutes under hot air conditions at 260°C to obtain a semi-finished melamine foam;

[0027] (2) Add 7 parts by mass of simethicone oil with a number average molecular weight of 16000 to 40 parts by mass of plasma water, hydrolyze for 6 hours, then add 13 parts by mass of silane coupling agen...

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Abstract

A method for preparing hydrophobic melamine foam is characterized by including the following steps that firstly, melamine and formaldehyde are mixed and reacted to obtain precondensate, the precondensate, a hardening agent, a nonionic surface active agent, a foaming agent, a light stabilizer and deionized water are mixed to form foaming liquid, the foaming liquid foams for 1-3 min to form a foam body through microwave radiation at the temperature of 40-70 DEG C, is cured for 7-25 min and is annealed for 25-60 min, and a melamine foam semi-finished product is obtained; secondly, dimethyl silicone oil, a silane coupling agent and plasma water are prepared into a hydrophobic solvent; thirdly, the prepared hydrophobic solvent is evenly sprayed on the melamine foam semi-finished product through a sprayer; fourthly, the foam sprayed with the hydrophobic solvent is dried for 5-15 min under the microwave condition, moisture and steam are exhausted through an air blower, and the hydrophobic melamine foam body is obtained. The preparation method has the advantages of improving foam hydrophobic performance, expanding the application field and being easy and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to a method for preparing hydrophobic melamine foam. Background technique [0002] Melamine foam is a kind of flame-retardant foam plastic made by special foaming process based on melamine formaldehyde resin, and the opening rate is as high as 99%. As a low-density, flame-retardant and sound-absorbing new chemical material, melamine foam has very important application value in the fields of civil, industrial, construction, transportation, aviation, military, daily use, electronic information, etc. Combustible, high temperature, and low frequency noise absorption requirements are used under environmental conditions, and it has become a new type of environmental protection material with great development prospects in the 21st century. [0003] However, the melamine foam forms a porous foam structure after microwave foaming. The foam has a very high porosity and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08G12/32
CPCC08J9/365C08G12/32C08G2101/00C08J2361/28
Inventor 陈照峰王伟伟
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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