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Preparation technology of low-formaldehyde melamine foamed plastic

A formaldehyde melamine and preparation process technology, which is applied to the preparation process of melamine foam plastics and the field of preparation technology, can solve problems such as non-compliance with environmental protection and safe use requirements, high free formaldehyde content, etc., and achieves reduction of formaldehyde residues and uniform foam dispersion. , the effect of good foaming performance

Active Publication Date: 2019-06-11
JIAXING HANGXING FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the raw materials for the preparation of melamine foam plastics is formaldehyde. Although it is theoretically said that there is no residual free formaldehyde after high-temperature foaming, in fact, there are still relatively high free formaldehyde in melamine foam plastics prepared by existing production processes. content, and after a long time of use, it will decompose and produce formaldehyde, which does not meet the requirements of environmental protection and safe use

Method used

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  • Preparation technology of low-formaldehyde melamine foamed plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of preparation technology of low-formaldehyde melamine foamed plastics, concrete steps are as follows:

[0027] (1) Add melamine to 1 / 3 of the formula amount of formaldehyde solution, add sodium citrate and sodium phosphate, react with 300W intermittent microwave for 3 minutes, then add the remaining formula amount of formaldehyde solution, and use triethanolamine to adjust the pH value to 9 , 300W intermittent microwave reaction for 10 minutes to obtain melamine-formaldehyde resin, wherein the mass concentration of formaldehyde solution is 37%, and the ratio of melamine, formaldehyde, sodium citrate and sodium phosphate is 1:2:0.02:0.04 ;

[0028] (2) Preheat the melamine resin prepared in step (1) to 30° C., add a surfactant and a foaming agent to it, stir for 2 minutes, then add a curing agent, and stir evenly to obtain a mixture; wherein, melamine, surfactant The mass ratio of agent, foaming agent and curing agent is 1:0.2:0.1:0.1;

[0029] (3) Pour the mix...

Embodiment 2

[0034] A kind of preparation technology of low-formaldehyde melamine foamed plastics, concrete steps are as follows:

[0035] (1) Add melamine to 1 / 3 of the formula amount of formaldehyde solution, add sodium citrate and sodium phosphate, react with 450W intermittent microwave for 5 minutes, then add the remaining formula amount of formaldehyde solution, and use triethanolamine to adjust the pH value to 10 , 450W intermittent microwave reaction for 15 minutes to obtain melamine formaldehyde resin, wherein the mass concentration of formaldehyde solution is 40%, and the ratio of melamine, formaldehyde, sodium citrate and sodium phosphate is 1:3:0.03:0.05 ;

[0036] (2) Preheat the melamine resin prepared in step (1) to 40° C., add a surfactant and a foaming agent to it, stir for 3 minutes, then add a curing agent, stir evenly, and obtain a mixture; wherein, melamine, surfactant The mass ratio of agent, foaming agent and curing agent is 1:0.3:0.2:0.2;

[0037] (3) Pour the mixt...

Embodiment 3

[0042] A kind of preparation technology of low-formaldehyde melamine foamed plastics, concrete steps are as follows:

[0043] (1) Add melamine to 1 / 3 of the formula amount of formaldehyde solution, add sodium citrate and sodium phosphate, react with 300W intermittent microwave for 5 minutes, then add the remaining formula amount of formaldehyde solution, and use triethanolamine to adjust the pH value to 9 , 450W intermittent microwave reaction for 10 minutes to obtain melamine-formaldehyde resin, wherein the mass concentration of formaldehyde solution is 40%, and the ratio of melamine, formaldehyde, sodium citrate and sodium phosphate is 1:2:0.03:0.04 ;

[0044](2) Preheat the melamine resin prepared in step (1) to 40°C, add a surfactant and a foaming agent to it, stir for 2 minutes, then add a curing agent, stir evenly, and obtain a mixture; wherein, melamine, surfactant The mass ratio of agent, foaming agent and curing agent is 1:0.2:0.2:0.1;

[0045] (3) Pour the mixture ...

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Abstract

The invention discloses a preparation technology of melamine foam material with low formaldehyde content. The preparation technology specifically comprises the following steps of (1) adding melamine into a formaldehyde solution of which the amount is equal to 1 / 3 of formula amount, adding sodium citrate and sodium phosphate, intermittently reacting for 3 to 5min by microwaves at the power of 300 to 450W, adding the left formaldehyde solution, adjusting the pH (potential of hydrogen) value to 9 to 10, and intermittently reacting for 10 to 15min by microwaves at the power of 300 to 450W, so as to obtain melamine and formaldehyde resin; (2) preheating the melamine obtained in step (1) to 30 to 40 DEG C, adding a surfactant and a foaming agent, stirring for 2 to 3min, adding a curing agent, and uniformly stirring, so as to obtain a mixture; (3) quickly pouring the mixture obtained in step (2) into a die, sending into a far-infrared heating furnace, pre-foaming, and baking for 1 to 2h at high temperature, so as to obtain the melamine foam plastic. The melamine foam plastic prepared by the preparation technology has the advantages that the residue amount of free formaldehyde is low, and the mechanical property and stability are better.

Description

technical field [0001] The invention relates to a preparation process, in particular to a preparation process of melamine foamed plastics. It belongs to the technical field of material preparation. Background technique [0002] Melamine foam was first introduced by BASF in Germany, and has long been in a high-price monopoly position. It is a new type of foam with a low-density three-dimensional grid structure prepared with melamine as the main raw material and with an opening rate of 99.9%. It has excellent absorption properties. Acoustic performance, flame retardant performance, heat insulation performance, insulation, moisture and heat resistance stability, safety and sanitation and secondary processing performance, etc. Melamine foam plastics have broad application prospects in fields such as construction, transportation, vehicle manufacturing, acoustic engineering, electronic information, and object surface cleaning and decontamination. [0003] One of the raw material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/32C08J9/10C08K3/36C08L61/28
CPCC08G12/32C08J9/102C08J9/105C08K3/36C08K2201/011C08L2203/14C08L61/28
Inventor 蒋红卫
Owner JIAXING HANGXING FINE CHEM