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Preparation method of low-hydroxymethyl melamine formaldehyde resin

A technology of methylol melamine and formaldehyde resin, which is applied in the field of preparation of low methylol melamine formaldehyde resin, can solve the problems of restricting large-scale application, bottleneck of industrialization scale, poor resin stability, etc., and achieve good stability and performance Superior, low-cost effect

Active Publication Date: 2014-04-16
SHANDONG ZHANHUA OSITER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low methylol content and poor resin stability, it is very unfavorable for storage. These shortcomings have brought a bottleneck to its industrial scale
At present, most of the products on the market are imported from abroad, and the price is high, which limits the large-scale application
[0003] Patent No. 201010124742.7 discloses a synthesis process of melamine resin, using melamine, formaldehyde, sodium hydroxide, hexamethylenetetramine, polyvinyl alcohol, ethanol, triethanolamine, etc., using four-step reaction, operation cumbersome steps
[0004] The patent application with the patent number 201310100523.9 discloses a synthesis process of melamine resin, using melamine, formaldehyde, sodium hydroxide, p-toluenesulfonamide, propylene glycol, alcohol, etc., using many materials and complicated steps, which is not conducive to production

Method used

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  • Preparation method of low-hydroxymethyl melamine formaldehyde resin

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation of low methylol melamine formaldehyde resin

[0029] (1) Mix melamine and formaldehyde aqueous solution in a ratio of melamine:formaldehyde aqueous solution of 9:20 by weight, adjust the pH to 7.8 with NaOH solution, heat up to 80°C and keep it warm for 160 minutes;

[0030] (2) After the reaction is finished, cool down to 50°C, and add melamine: water in a ratio of 9:5 by weight;

[0031] (3) Filtrate to obtain the finished resin product, grouped as No. 1.

Embodiment 2

[0032] Embodiment 2: the preparation of low methylol melamine formaldehyde resin

[0033] (1) Mix melamine and formaldehyde aqueous solution in a ratio of 10:25 by weight of melamine:formaldehyde aqueous solution, adjust the pH to 8.0 with NaOH solution, heat up to 80°C and keep it warm for 160 minutes;

[0034] (2) After the reaction is finished, cool down to 50°C, and add melamine: water in a ratio of 10:6 by weight;

[0035] (3) Filtrate to obtain the finished resin product, grouped as No. 2.

Embodiment 3

[0036] Embodiment 3: the preparation of low methylol melamine formaldehyde resin

[0037] (1) Mix melamine and formaldehyde aqueous solution in a ratio of melamine:formaldehyde aqueous solution of 15:35 in parts by weight, adjust the pH to 8.5 with NaOH solution, heat up to 75°C and keep it warm for 180 minutes;

[0038] (2) After the reaction is finished, cool down to 50°C, and add melamine: water in a ratio of 15:8 by weight;

[0039] (3) Filtrate to obtain the finished resin product, grouped as No. 3.

[0040] The product performance indexes of the above-mentioned embodiments are compared in Table 1.

[0041] Table 1 performance index table of each embodiment

[0042]

[0043] As can be seen from the above indicators, the indicators of the low methylol melamine formaldehyde resin prepared by the embodiments of the present invention have better or the same performance as the imported products, and can be effectively preserved, reducing the cost.

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Abstract

The invention relates to the technical field of a preparation process of melamine formaldehyde resin, in particular to a preparation method of low-hydroxymethyl melamine formaldehyde resin. The preparation method comprises the following steps: mixing melamine and an aqueous solution of formaldehyde in the way that the ratio of the melamine to the aqueous solution of formaldehyde is (9 to 15):(20 to 35) in part by weight, regulating the pH to the range from 7.5 to 8.5 by an NaOH solution, heating and warming to the temperature of 70 to 90 DEG C and performing the thermal reaction for 120 to 180 minutes; after the reaction is finished, cooling to the temperature of 45 to 55 DEG C and adding water according to the fact that the ratio of melamine to water is (9 to 15):(5 to 10) in part by weight; filtering so as to obtain the resin finished product. Through the regulation on raw material components in the process steps, the addition sequence of the components, time, the ratio of the components in part by weight, reaction parameters in the technical process and the like and the mutual coordination effect of factors, the low-hydroxymethyl melamine formaldehyde resin, which has high stability and superior performance, is low in cost and price, and adopts the simple preparation method, is obtained.

Description

technical field [0001] The invention relates to the technical field of preparation technology of melamine formaldehyde resin, in particular to a preparation method of low methylol melamine formaldehyde resin. Background technique [0002] Low methylol melamine formaldehyde resin is usually used in mineral wool boards, textile fabrics, paper, leather and surfaces as stiffening agents, glazing agents, flame retardants and wood adhesives. It can be dissolved in water, and after forming a film, it has flame retardancy, water resistance, aging resistance, arc resistance and corrosion resistance; it has good insulation, gloss and mechanical strength. However, due to the low methylol content and poor resin stability, it is very unfavorable for storage. These shortcomings have brought a bottleneck to its industrial scale. At present, most of the products on the market are imported from abroad, and the price is high, which limits the large-scale application. [0003] Patent No. 201...

Claims

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Application Information

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IPC IPC(8): C08G12/32
Inventor 鲍志明胡晓川徐庆平
Owner SHANDONG ZHANHUA OSITER CHEM
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