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Preparation method of partially methylated amino resin

A technology of amino resin and methyl etherification, which is applied in the field of preparation of partially methyl etherified amino resin, can solve the problems of aldehyde-containing waste water, long time consumption, high energy consumption, etc., and achieve low environmental pollution, good product quality, and low energy consumption Effect

Active Publication Date: 2015-08-12
ZHEJIANG XINHUA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a part with good product quality, easy control of conditions and low energy consumption in order to solve the defects of high energy consumption, high aldehyde-containing wastewater, long time consumption and low production capacity in the existing method for preparing high methylated amino resin The preparation method of methyl etherified amino resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw material is melamine, the mass ratio of polyoxymethylene and methanol is 1:2.5:3.9, and the raw material of melamine is 1000kg.

[0022] A kind of preparation method of partial methyl etherification amino resin, described preparation method comprises the following steps:

[0023] a) Add the catalyst mixture of yttrium oxide and vermiculite, 2 / 3 of the total mass of polyoxymethylene and melamine, and add sodium hydroxide to adjust the pH to 8.8, then raise the temperature to 55°C, stabilize the pH to 8.8, and keep it for 1 hour Add the remaining polyoxymethylene, continue to heat up to 65°C, and keep warm for 2 hours; wherein, the amount of catalyst added is 3% of the mass of melamine, and the mass ratio of the two substances in the catalyst is 1:1;

[0024] b) After step a) is completed, add methanol with 40% of the total mass of methanol, add formic acid to adjust the pH to 3, keep warm at 60°C for 3 hours, add sodium hydroxide to adjust the pH to 8.8, heat up ...

Embodiment 2

[0027] The raw material is melamine, the mass ratio of polyoxymethylene and methanol is 1:3:4, and the mass of melamine is 1000kg.

[0028] A kind of preparation method of partial methyl etherification amino resin, described preparation method comprises the following steps:

[0029] a) Add the catalyst mixture of triethylamine and dimethylacetamide, polyoxymethylene and melamine into the reaction kettle, add sodium bicarbonate to adjust the pH to 9, then raise the temperature to 58°C, stabilize the pH to 8.9, keep warm for 2 hours and continue to heat up To 66.5 ° C, heat preservation reaction for 3 hours; wherein, the amount of catalyst added is 4% of the mass of melamine, and the mass ratio of the two substances in the catalyst is 1:1;

[0030] b) After step a) is completed, add methanol with 40% of the total mass of methanol, add hypochlorous acid to adjust the pH to 4, keep warm at 62°C for 3.2h, add sodium bicarbonate to adjust the pH to 8.9, heat up to 112°C for distilla...

Embodiment 3

[0033] The raw material is melamine, the mass ratio of polyoxymethylene and methanol is 1:3.9:6, and 1000kg of melamine.

[0034] A kind of preparation method of partial methyl etherification amino resin, described preparation method comprises the following steps:

[0035] a) Add the mixture of catalyst acetamide and phthalic anhydride, polyoxymethylene and melamine into the reaction kettle, add ammonia water to adjust the pH to 9.2, then raise the temperature to 60°C, stabilize the pH to 9, keep warm for 3h, continue to heat up to 68°C, and keep warm for 4h ; Wherein, the add-on of catalyzer is 5.5% of melamine quality, and the mass ratio of two kinds of substances is 1:1 in the catalyzer;

[0036] b) After step a) is completed, add methanol with 40% of the total mass of methanol, add oxalic acid to adjust the pH to 4.2, keep warm at 65°C for 3.5h, add ammonia water to adjust the pH to 9, heat up to 115°C for distillation;

[0037] c) After step b) is completed, cool down to...

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Abstract

The invention relates to a preparation method of partially methylated amino resin. The method comprises the following steps: carrying out a hydroxylation reaction on melamine and paraform, and adding methanol to generate the methylated amino resin. The preparation method has the advantages of high conversion rate, safe reaction and production, simple process, low energy consumption, simple post-treatment, low cost, small environmental pollution, good product quality and easy condition control.

Description

technical field [0001] The invention relates to a method for preparing a resin, in particular to a method for preparing a partially methylated amino resin with good product quality, easy condition control and low energy consumption. Background technique [0002] Amino resin products are thermosetting polymers produced by the condensation reaction of melamine and formaldehyde solution or paraformaldehyde. A good amino resin should have a wide range of colors, excellent electrical insulation, flame retardancy, high temperature resistance, pollution resistance, water resistance, safety and sanitation and other superior properties. Methylated amino resins are widely used in metal preprocessing coatings, water-based coatings and automotive coatings. Generally speaking, the production process is to react melamine with formaldehyde first, and then react the product with methanol, and obtain it through a series of follow-up treatments. of finished products. However, this method ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/42
Inventor 王正强谌兴旺祝晋文
Owner ZHEJIANG XINHUA NEW MATERIAL TECH CO LTD
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