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High-hydroxyl methylated melamine resin and preparation method thereof

A technology of high hydroxy methyl etherified melamine and melamine, applied in the direction of coating, etc., can solve the problems of high baking temperature of methyl etherified melamine resin, unable to use water-based paint, high energy consumption, etc., achieving good water solubility and saving process time, and the effect of reducing energy consumption

Inactive Publication Date: 2014-04-09
SHANDONG ZHANHUA OSITER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the existing preparation process, the prepared methyl etherified melamine resin has high baking temperature, high energy consumption, and low compatibility with water, so it cannot be used for water-based coatings.

Method used

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  • High-hydroxyl methylated melamine resin and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The high hydroxyl methyl etherified melamine resin comprises the following raw materials: melamine, formaldehyde solution, methanol and formic acid, wherein the weight ratio of melamine, formaldehyde solution and methanol is 2:8:12; the weight ratio of formic acid and melamine is 1 :5.

[0014] The preparation method of the high-hydroxy methyl etherified melamine resin comprises the following steps: first, mix melamine and formaldehyde aqueous solution in proportion, adjust the pH to 9.5 with NaOH solution, heat up to 65°C, and keep warm for 90 minutes; then add in proportion Methanol, then add formic acid according to the ratio of formic acid: melamine weight ratio of 1:5, keep warm for etherification reaction at 50°C for 60 minutes, add NaOH solution to adjust the pH to 9.0, and finally dealcoholize and dehydrate under negative pressure, filter to obtain the resin finished product.

Embodiment 2

[0016] The high hydroxyl methyl etherified melamine resin comprises the following raw materials: melamine, formaldehyde solution, methanol and formic acid, wherein the weight ratio of melamine, formaldehyde solution and methanol is 2:10:15; the weight ratio of formic acid and melamine is 1 :5.

[0017] The preparation method of the high-hydroxy methyl etherified melamine resin comprises the following steps: first, mix melamine and formaldehyde aqueous solution in proportion, adjust the pH to 9.0 with NaOH solution, heat up to 70°C, and keep warm for 90 minutes; then add in proportion Methanol, then add formic acid according to the ratio of formic acid: melamine weight ratio of 1:5, keep warm for etherification reaction at 45°C for 60 minutes, add NaOH solution to adjust the pH to 9.0, and finally dealcoholize and dehydrate under negative pressure, filter to obtain the resin finished product.

Embodiment 3

[0019] The high hydroxyl methyl etherified melamine resin comprises the following raw materials: melamine, formaldehyde solution, methanol and formic acid, wherein the weight ratio of melamine, formaldehyde solution and methanol is 3:11:20; the weight ratio of formic acid and melamine is 1 :5.

[0020] The preparation method of the high-hydroxy methyl etherified melamine resin comprises the following steps: first, mix melamine and formaldehyde aqueous solution in proportion, adjust the pH to 8.5 with NaOH solution, heat up to 75°C, and keep warm for 90 minutes; then add in proportion Methanol, then add formic acid according to the ratio of formic acid: melamine weight ratio of 1:5, keep warm at 40°C for etherification reaction for 60 minutes, add NaOH solution to adjust the pH to 9.0, and finally dealcoholize and dehydrate under negative pressure, filter to obtain the resin finished product.

[0021] Embodiment 1, embodiment 2, embodiment 3 compare the following table with th...

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PUM

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Abstract

The invention belongs to the technical field of melamine resin and specifically relates to high-hydroxyl methylated melamine resin and a preparation method thereof. The high-hydroxyl methylated melamine resin is prepared from the following materials: melamine, formaldehyde aqueous liquor, methanol and formic acid, wherein a weight ratio of melamine to the formaldehyde aqueous liquor to methanol is (2-3):(8-12):(12-20); the weight ratio of formic acid to melamine is 1:5. The high-hydroxyl methylated melamine resin disclosed by the invention is water-soluble, so that scope of application of the resin is increased, and time and cost of roasting the resin into a film are lowered.

Description

technical field [0001] The invention belongs to the technical field of melamine resin, and in particular relates to a high-hydroxy methyl etherified melamine resin and a preparation method thereof. Background technique [0002] Methylated melamine resin is a high-efficiency crosslinking agent for epoxy resin, alkyd resin, ester resin and acrylic resin. It can be used in oily coatings and can be well dissolved in alkyd resin and acrylic resin to make top-level baking paint. It is used in solvent-based decorative coatings, coil coatings, powder coatings, can coatings, high-solid coatings, and can also be used in ink industry, paper industry, etc. However, according to the existing preparation process, the prepared methyl etherified melamine resin has high baking temperature, high energy consumption, and low compatibility with water, so it cannot be used for water-based paints. Contents of the invention [0003] The object of the present invention is to provide a kind of hig...

Claims

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Application Information

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IPC IPC(8): C08G12/42C09D161/32
Inventor 鲍志明胡晓川徐庆平
Owner SHANDONG ZHANHUA OSITER CHEM
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