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Preparation method of high imino methylated melamine resin

A technology of high imino methyl etherification of melamine and melamine, which is applied in the field of preparation of melamine resin, can solve problems such as industrial scale bottlenecks, achieve high promotion and application value, rapid curing reaction, and small baking weight loss.

Active Publication Date: 2013-05-15
SHANDONG ZHANHUA OSITER CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These shortcomings have brought bottlenecks to its industrialization scale

Method used

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  • Preparation method of high imino methylated melamine resin

Examples

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Embodiment 1

[0013] Embodiment 1: the preparation of imino methyl etherified melamine resin

[0014] (1) Mix melamine, solid formaldehyde, formaldehyde aqueous solution, and methanol in proportions by weight of melamine:solid formaldehyde:formaldehyde aqueous solution:methanol at 15:10:35:20, adjust the pH to 8.0 with NaOH solution, heat up to 60°C and keep it warm React for 90 minutes;

[0015] (2) After reacting for 90 minutes, add methanol. The ratio of the amount of methanol added to the weight of the mixture before adding is 1:1. Use hydrochloric acid to adjust the pH to 2.5. Keep the etherification reaction at 35°C for 60 minutes. Add NaOH solution to adjust the pH to 9.0, carry out negative pressure dealcoholization and dehydration.

[0016] (3) Add methanol to the mixture after negative pressure dealcoholization and dehydration, the ratio of the amount of methanol added to the weight of methanol added in step (2) is 1:2, add hydrochloric acid to adjust the pH to 2.5, and keep the ...

Embodiment 2

[0018] Embodiment 2: the preparation of imino methyl etherified melamine resin

[0019] (1) Mix melamine, solid formaldehyde, formaldehyde aqueous solution, and methanol in proportions by weight of melamine:solid formaldehyde:formaldehyde aqueous solution:methanol at 20:6:40:20, adjust the pH to 9.0 with NaOH solution, heat up to 80°C and keep warm React for 90 minutes;

[0020] (2) After reacting for 90 minutes, add methanol, the ratio of the amount of methanol added to the weight of the mixture before adding is 1: 2, adjust the pH to 4.5 with hydrochloric acid, keep warm at 50°C for etherification reaction for 60 minutes, add NaOH solution to adjust the pH to 9.0, carry out negative pressure dealcoholization and dehydration.

[0021] (3) Add methanol to the mixture after negative pressure dealcoholization and dehydration, the ratio of the amount of methanol added to the weight of methanol added in step (2) is 2: 1, add hydrochloric acid to adjust the pH to 4.5, and keep the...

Embodiment 3

[0023] Embodiment 3: the preparation of imino methyl etherified melamine resin

[0024] (1) Mix melamine, solid formaldehyde, formaldehyde aqueous solution, and methanol in proportions by weight of melamine:solid formaldehyde:formaldehyde aqueous solution:methanol at 10:10:45:20, adjust the pH to 8.5 with NaOH solution, heat up to 70°C and keep warm React for 90 minutes;

[0025] (2) After reacting for 90 minutes, add methanol, the ratio of the amount of methanol added to the weight of the mixture before adding is 3:1, adjust the pH to 3 with hydrochloric acid, keep warm at 40°C for 60 minutes, add NaOH solution to adjust the pH to 9.0, carry out negative pressure dealcoholization and dehydration.

[0026] (3) Add methanol to the mixture after negative pressure dealcoholization and dehydration, the ratio of the amount of methanol added to the weight of methanol added in step (2) is 1.5:1, add hydrochloric acid to adjust the pH to 3, and keep the ether at 40°C React for 30 mi...

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Abstract

The invention relates to a preparation method of high imino methylated melamine resin. According to the preparation method, by adjusting the components of raw materials, the adding sequence of the components, the time, the proportion of the components in parts by weight, reaction parameters of the process of the method and the like in the steps of the method, the oiliness of the obtained high imino methylated melamine resin can be greatly improved, the weight loss in baking is small, a strong acid is not required for catalysis, the resin can perform rapid curing reaction under the general baking condition of 110-150 DEG C, and the resin has higher anti-curing performance; and in addition, the resin is fully water soluble, the range of applications of the resin is greatly expanded and the popularization and application value is further higher.

Description

technical field [0001] The invention relates to the technical field of preparation methods of melamine resins, in particular to a preparation method of high imino methyl etherified melamine resins. Background technique [0002] High imino methyl etherified melamine resin is an efficient crosslinking agent for epoxy resin, alkyd resin, ester resin and acrylic resin. The resin has good compatibility with water-soluble polymers, and is very suitable for preparing color plate paint and industrial quick-baking paint. However, according to the existing preparation method, the prepared high imino methyl etherified melamine resin can only be partially soluble in water, has a narrow application range, and has low oiliness. The various performance indicators on the baked film are not high. These shortcomings have brought bottlenecks to its industrialization scale. Contents of the invention [0003] For the deficiencies in the prior art, the object of the present invention is to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/42C08G12/32
Inventor 鲍志明徐庆平胡晓川祝华杨占君
Owner SHANDONG ZHANHUA OSITER CHEM
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