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Continuous production method of high imino methylated melamine formaldehyde resin

A high-imino methyl etherified melamine and production method technology, applied in the field of fine chemicals, can solve the problems of reducing the effect of etherification, unstable product quality, and low automation level, so as to reduce the degree of product polymerization and easily control the degree of reaction , the effect of low degree of automation

Pending Publication Date: 2021-10-01
SHANDONG YANGGU HUATAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses formaldehyde aqueous solution as a raw material. After the reaction, the intermediate contains a large amount of water. The intermediate is directly etherified without dehydration, which reduces the effect of etherification. Two-step etherification is required to meet the requirements. The process is cumbersome and inconvenient to operate. , this process is a batch production process, the automation level of the batch production method is low, there will be quality differences between each batch of products, resulting in unstable product quality, and the entire production process is time-consuming, low production efficiency, and will also produce More industrial wastewater, poor environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Method for preparing a highly methyl methyl etherified melamine formaldehyde resin, including the following steps:

[0035] Step 1: 135 g of polymethoxaldehyde and 433 g of methanol were put onto the polymer, and the material was stirred and the material was adjusted with a liquid base to warm the material to 63 ° C with a constant temperature water at 75 ° C, and heat insulation at 63 ° C for 15 min;

[0036] Step 2: 568 g of the pellet feed speed and 126 g of melamine in accordance with the feed velocity of 126 g / h in accordance with the feed speed of 126 g / h in the pipeline in the pipe, and the liquid base is passed into the conduit. Keep the material pH is 9.5, and the pipe is immersed in hot water at 68 ° C to 68 ° C, and the reaction is charged 11min at 68 ° C;

[0037]Step 3: After 11 minutes, the temperature dropped to 40 ° C according to the cooling speed of 6 ° C / min, and then maintained, the temperature was retained, and the hydrochloric acid was quantified...

Embodiment 2

[0040] Method for preparing a highly methyl methyl etherified melamine formaldehyde resin, including the following steps:

[0041] Step 1: 133 g of polymethylene and 433 g of methanol were put onto the polymer, and the material was stirred and the material was adjusted to pH = 8.5 with a liquid base, and the temperature was heated to 63 ° C with a constant temperature water at 75 ° C, and 15 min at 63 ° C;

[0042] Step 2: 566 g of the pellet feed speed and 126 g of melamine in accordance with the feed velocity of 126 g / h in accordance with the feed speed of 126 g / h in accordance with the feed speed of 126 g / h, and the liquid base is passed to the conduit, and the material pH is 9.5, The temperature was heated to 70 ° C and the reaction was charged at this temperature for 11 min;

[0043] Step 3: After 11 minutes, the temperature dropped to 40 ° C according to the cooling speed of 8 ° C / min, and then maintained, the temperature was quantified, and the hydrochloric acid was...

Embodiment 3

[0046] Method for preparing a highly methyl methyl etherified melamine formaldehyde resin, including the following steps:

[0047] Step 1: 35 g of polymethylene formaldehyde and 420 g of methanol were put into the polymer, and the material was stirred and the material was adjusted to pH = 9.0 with a liquid base, and the temperature of 75 ° C was warmed to 65 ° C, and the heat was 15 min at 65 ° C;

[0048] Step 2: 555 g of the polymethroscopic material is passed into the pipe according to the feed speed of 126 g / h and 126 g of melamine, and the liquid base is passed into the conduit, maintaining the material pH of 9.8, and immersed the pipe at 65 ° C. In the hot water, the reaction was charged at 65 ° C for 12min;

[0049] Step 3: After 11 minutes, the temperature dropped to 40 ° C according to the cooling speed of 7 ° C / min, and then maintained, quantitatively added hydrochloric acid adjusted pH = 3.5, after 9 min, quantitatively added liquid base regulation pH = 8.5, termina...

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Abstract

The invention discloses a continuous production method of high imino methylated melamine formaldehyde resin. The continuous production method comprises the following steps: mixing para-formaldehyde and methanol, and de-polymerizing para-formaldehyde into formaldehyde under an alkaline condition; continuously feeding the de-polymerized mixture and melamine into a pipeline for reaction, and ensuring that the pH value of the material is alkaline in the reaction process, the reaction temperature is 65-70 DEG C, and the heat preservation reaction time is 10-12 minutes; after the reaction is finished, keeping the materials continuously flowing in the pipeline, cooling the materials to 39-41 DEG C, adjusting the pH value to 3-4, carrying out etherification reaction, keeping the temperature for 8-10 minutes, adjusting the pH value to be alkaline after the temperature is kept, and terminating the reaction; and taking out the material from the pipeline, carrying out reduced pressure distillation, removing water and methanol, then adding isobutanol, adjusting to a proper solid content, and filtering to obtain the product. The method has the advantages of being easy to operate, high in automation level, environmentally friendly, high in yield and the like.

Description

Technical field [0001] The present invention relates to a continuous production method of a highly subinamine methyl etherified melamine formaldehyde resin, which specifically involves a simple process, stable product quality, simple operation, high green environmental, high production efficiency for paint crosslinking agents. The continuous production method of urethane etherified melamine formaldehyde resin is in the field of fine chemical technology. Background technique [0002] The coating crosslinking agent is a very important alkanol etherified melamine formaldehyde resin in an amino resin. At present, the amino resin derofliol etherified polyhydroxyl resin with coating is preliminary, and the methanol etherified melamine formaldehyde resin (referred to as HMMM) is still in the development phase. [0003] The methanol etherified melamine formaldehyde resin has developed rapidly in the past 60s, which has a large proportion of melamine resin in the United States. For exampl...

Claims

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Application Information

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IPC IPC(8): C08G12/42C08G12/40C08G12/32
CPCC08G12/427C08G12/40C08G12/32Y02P20/10
Inventor 王才朋孟祥克马德龙徐思明孟庆勇董玉灿温以亮王克军崔亭亭
Owner SHANDONG YANGGU HUATAI CHEM
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