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Method for synthesizing melamine resin by mixing and etherifying methyl alcohol and isopropyl alcohol

A technology of melamine and methylolated resin, which is applied in the field of mixed etherification of isopropanol to synthesize melamine resin and methanol, which can solve the problems of unsatisfactory substrate resin compatibility, incomplete methylation, high product viscosity, etc. , to achieve the effect of low product viscosity, low water content and good compatibility

Inactive Publication Date: 2016-11-16
合肥普庆新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the preparation of melamine resin requires the use of aqueous formaldehyde solution with a concentration of 37%. The water content of this reaction system is relatively high, the methyl etherification is not complete, the product viscosity is high, and the compatibility with the base resin is not too high. ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for synthesizing melamine resin with methanol and isopropanol mixed etherification, the steps are as follows:

[0032] ①, hydroxymethylation reaction

[0033] Add paraformaldehyde to methanol and raise the temperature to 70°C for depolymerization, then adjust the pH value to 7.5 with triethylamine or NaOH, add melamine according to the mass ratio of melamine and paraformaldehyde as 1:1.5, and methylolation reaction The reaction temperature is 70°C, the reaction time is 1.5h, and the methylolated resin is obtained.

[0034] ②, etherification reaction

[0035] Add methanol and isopropanol according to the mass ratio of methylolated resin, methanol, and isopropanol at 2:1.8:1.5, and use solid acid catalyst AlCl 3 The pH value of the system was adjusted to 5, the etherification reaction temperature was 45° C., and the reaction time was 1.5 h.

[0036] ③, product post-processing

[0037] Distill under reduced pressure at 50°C, and then remove the solid acid by p...

Embodiment 2

[0039] A method for synthesizing melamine resin with methanol and isopropanol mixed etherification, the steps are as follows:

[0040] ①, hydroxymethylation reaction

[0041] Add paraformaldehyde to methanol and raise the temperature to 70°C for depolymerization, then adjust the pH value to 8.5 with triethylamine or NaOH, add melamine according to the mass ratio of melamine and paraformaldehyde as 1:1.8, and methylolation reaction The reaction temperature is 70°C, the reaction time is 2h, and the methylolated resin is obtained.

[0042] ②, etherification reaction

[0043] Add methanol and isopropanol according to the mass ratio of methylolated resin, methanol, and isopropanol at 2:1.2:2, and select solid acid catalyst FeCl 3 The pH value of the system was adjusted to 4, the etherification reaction temperature was 50° C., and the reaction time was 0.5 h.

[0044] ③, product post-processing

[0045] Distill under reduced pressure at 50°C, and then remove the solid acid by pr...

Embodiment 3

[0047] A method for synthesizing melamine resin with methanol and isopropanol mixed etherification, the steps are as follows:

[0048] ①, hydroxymethylation reaction

[0049] Add paraformaldehyde to methanol and raise the temperature to 70°C for depolymerization, then adjust the pH value to 9.5 with triethylamine or NaOH, add melamine according to the mass ratio of melamine and paraformaldehyde as 1:2.0, and methylolation reaction The reaction temperature is 70°C, the reaction time is 3h, and the methylolated resin is obtained.

[0050] ②, etherification reaction

[0051] Add methanol and isopropanol according to the mass ratio of methylolated resin, methanol, and isopropanol at 2:2:1.2, and use solid acid catalyst TiCl 3 The pH value of the system was adjusted to 3, the etherification reaction temperature was 60°C, and the reaction time was 0.5h.

[0052] ③, product post-processing

[0053] Distill under reduced pressure at 50°C, and then remove the solid acid by pressure...

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Abstract

The invention relates to the technical field of production of melamine resins and in particular relates to a method for synthesizing a melamine resin by mixing and etherifying methyl alcohol and isopropyl alcohol. The method comprises the following steps: adding paraformaldehyde into methyl alcohol, raising the temperature, depolymerizing, regulating the pH value by using triethylamine or NaOH, and adding melamine to carry out a hydroxymethylation reaction, thereby obtaining a hydroxymethylated resin; adding the methyl alcohol and isopropyl alcohol, selecting a solid acid catalyst to regulate the pH value of the system, performing reduced pressure distillation, and removing the solid acid in a filter pressing manner, thereby obtaining the melamine resin. According to the invention, formaldehyde aqueous solution with commercial concentration of 37% is depolymerized and replaced with the paraformaldehyde, the moisture content in the reaction system is reduced to promote full methyl etherification of the final product, the product is low in viscosity and high in compatibility with a matrix resin, and can serve as a cross-linking agent of a water-based resin, and the coating is endowed with excellent performance. By mixing and etherifying the methyl alcohol and isopropyl alcohol, the reaction can be complete, and the yield is high.

Description

technical field [0001] The invention relates to the technical field of melamine resin production, in particular to a method for synthesizing melamine resin by mixed etherification of methanol and isopropanol. Background technique [0002] Melamine resin is mainly made from melamine, formaldehyde, and butanol. It can be used in the plastics and paint industries, and can also be used as an anti-folding and anti-shrinking treatment agent for textiles. Its modified resin can be used as metal coating with bright color, durability and good hardness. It can also be used for strong, heat-resistant decorative veneer, moisture-proof paper and gray leather tanning agent, adhesive for synthetic fireproof laminates, fixative or hardener for waterproofing agents, etc. [0003] In the prior art, the preparation of melamine resin requires the use of aqueous formaldehyde solution with a concentration of 37%. The water content of this reaction system is relatively high, the methyl etherifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/42C08G12/32
CPCC08G12/427C08G12/32
Inventor 何宗文王虎
Owner 合肥普庆新材料科技有限公司
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