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Method for reducing formaldehyde in etherified melamine resin

A melamine resin and etherification technology, which is applied in the field of aldehyde reduction in etherified melamine resin, can solve the problem that free formaldehyde in etherified melamine resin cannot be further reduced, and achieve low cost, no pollution to the environment, and simple operation methods Effect

Inactive Publication Date: 2016-09-28
CHONGQING JIANFENG HAOKANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention proposes a method for reducing aldehyde in etherified melamine resin, which solves the problem that free formaldehyde in etherified melamine resin cannot be further reduced in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for reducing aldehydes in etherified melamine resins of the present embodiment comprises:

[0018] Step S1, after removing all the methanol and water in the melamine resin, the etherified melamine resin is placed in an etherification reaction kettle. Since methanol is soluble in water, methanol is removed together during dehydration.

[0019] Step S2, adding 10% methanol (mass percentage to melamine resin) into the etherification reactor, and blowing dry air.

[0020] Step S3, adjusting the rotational speed of the agitator in the etherification reactor to 60 rpm.

[0021] Step S4, start the vacuum pump, control the vacuum degree to 0.09 MPa, and dehydrate under the vacuum condition of 60° C. for 1 hour.

[0022] After step S4, it also includes: filtering impurities including salt and insoluble matter, so as to maintain the purity of the product. After filtering, it can be packaged.

Embodiment 2

[0024] A method for reducing aldehydes in etherified melamine resins of the present embodiment comprises:

[0025] Step S1, after removing all the methanol and water in the melamine resin, the etherified melamine resin is placed in an etherification reaction kettle. Since methanol is soluble in water, methanol is removed together during dehydration.

[0026] Step S2, adding 30% methanol (mass percentage to melamine resin) into the etherification reactor, and blowing in dry air.

[0027] Step S3, adjusting the rotational speed of the agitator in the etherification reactor to 30 rpm.

[0028] Step S4, start the vacuum pump, control the vacuum degree to 0.07MP, and dehydrate under the vacuum condition of 50° C. for 3 hours.

[0029] After step S4, it also includes: filtering impurities including salt and insoluble matter, so as to maintain the purity of the product. After filtering, it can be packaged.

Embodiment 3

[0031] A method for reducing aldehydes in etherified melamine resins of the present embodiment comprises:

[0032] Step S1, after removing all the methanol and water in the melamine resin, the etherified melamine resin is placed in an etherification reaction kettle. Since methanol is soluble in water, methanol is removed together during dehydration.

[0033] Step S2, adding 20% ​​methanol (mass percentage to melamine resin) into the etherification reactor, and blowing dry air.

[0034] Step S3, adjusting the rotational speed of the agitator in the etherification reactor to 90 rpm.

[0035] Step S4, start the vacuum pump, control the degree of vacuum to 0.07 MP, and dehydrate for 2 hours under vacuum conditions at a temperature of 90°C.

[0036] After step S4, it also includes: filtering impurities including salt and insoluble matter, so as to maintain the purity of the product. After filtering, it can be packaged.

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PUM

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Abstract

The invention relates to the technical field of resin synthesis, and discloses a method for reducing aldehyde in etherified melamine resin, comprising: S1: after removing all methanol and water in etherified melamine resin, the etherified melamine The resin is placed in the etherification reaction kettle; S2: add methanol with a mass ratio of 10% to 30% relative to the etherified melamine resin into the etherification reaction kettle, and introduce dry air; S3: adjust the ether The stirring speed of the chemical reaction kettle is 30-120 rpm; S4: start the vacuum pump, control the vacuum degree of 0.07MPa-0.09MPa, and dehydrate for 1-3h under vacuum conditions at a temperature of 50℃-90℃. Compared with the traditional method, the method of the present invention does not add any chemical reagents and has no impurities in the process of reducing free formaldehyde; and the operation method is simple, the cost is low, and the environment is not polluted.

Description

technical field [0001] The invention relates to the technical field of resin synthesis, in particular to a method for reducing aldehydes in etherified melamine resins. Background technique [0002] Etherified melamine resins are mainly used as raw materials for architectural coatings and automotive adhesives, and are suitable for the production of high-performance adhesives A, coating cross-linking agents, clothing finishing agents, high-performance composite materials and the processing of downstream fine chemical products. [0003] At present, the content of free formaldehyde in the etherified melamine resin produced by the traditional process is about 0.3-1.0%. In order to further reduce the free formaldehyde in the finished product, the following two methods are mainly adopted at present: [0004] First: Change the feeding ratio and feeding method of raw materials; [0005] Second: Add reactants capable of polycondensation reaction with formaldehyde in the middle and l...

Claims

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Application Information

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IPC IPC(8): C08G12/42
CPCC08G12/427
Inventor 吴常兴王文武周建平张志轩
Owner CHONGQING JIANFENG HAOKANG CHEM