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A kind of method for preparing xylene formaldehyde resin

A xylene formaldehyde resin and xylene technology, applied in the polymer field, can solve the problems of difficult waste liquid treatment, opaque products, low resin yield, etc., and achieve the effects of high environmental protection value, easy handling, and improved quality and yield.

Active Publication Date: 2016-06-29
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Because a large amount of sulfuric acid needs to be used as a catalyst in the production, a large amount of water is used for washing, therefore, a large amount of waste water and waste acid will be produced, and when the waste water and waste acid are separated from the resin, there will be local xylene and xylene resin with water, formaldehyde, Acid-miscible substances are produced and are not easy to separate. In this way, not only a large amount of xylene and xylene resin exist in the waste acid wastewater, but it is very difficult to treat the waste liquid. Moreover, the yield of the resin is low, the product is opaque, and calcium is easily produced. salt impurities

Method used

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  • A kind of method for preparing xylene formaldehyde resin
  • A kind of method for preparing xylene formaldehyde resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] In the enamel reactor with stirring of 5000L, add 1000kg mass concentration and be the formaldehyde of 37% and the xylene of 1400kg, under the cooling of jacket cooling water, slowly add 432kg mass concentration therein in 45 minutes and be 98% sulfuric acid, After the addition, slowly heat up to boiling reflux within 30 minutes, and react at constant temperature for 6 hours;

[0058] After the constant temperature reaction, the reaction liquid is stilled, and the sulfuric acid is separated, and 1440 kg of ion-free water is added to the remaining xylene formaldehyde resin, neutralized with triethanolamine, and when the pH value is 6.5 to 7.5, 7.2 kg of demulsifier is added to it and stirred evenly , stand still, separate water and xylene formaldehyde resin solution;

[0059] Put the xylene formaldehyde resin solution into the debenzene kettle, and under the condition of 130°C, decompress to remove the unreacted xylene. When the viscosity of the resin reaches 150cp / 25°C,...

Embodiment 2

[0064] In the enamel reactor of 5000L band agitation, add 420kg paraformaldehyde and 1400kg xylene, under the cooling of jacket cooling water, slowly add 455kg mass concentration wherein to it in 60 minutes and be the sulfuric acid of 98%, after adding, in Slowly heat up to boiling reflux within 45 minutes, and react at a constant temperature for 7 hours;

[0065] After the constant temperature reaction, the reaction liquid is stilled, and the sulfuric acid is separated, and 1440 kg of deionized water is added to the remaining xylene formaldehyde resin, neutralized with triethanolamine, and when the pH value is 6.5 to 7.5, 3.64 kg of demulsifier is added to it and stirred evenly , stand still, separate water and xylene formaldehyde resin solution;

[0066] Pour the xylene formaldehyde resin solution into the debenzene kettle, and under the condition of 150°C, decompress and remove the unreacted xylene. When the viscosity of the resin reaches 300cp / 25°C, it is the end point of ...

Embodiment 3

[0071] In a 5000L enamel reactor with stirring, add 568kg of formaldehyde with a mass concentration of 37% and 1400kg of xylene, under the cooling of jacket cooling water, slowly add 393.6kg of sulfuric acid with a mass concentration of 98% within 50 minutes, add After that, slowly heat up to boiling reflux within 40 minutes, and react at constant temperature for 8 hours;

[0072] After the constant temperature reaction, the reaction liquid is stilled, and the sulfuric acid is separated, and 1440 kg of deionized water is added to the remaining xylene formaldehyde resin, neutralized with triethanolamine, and when the pH value is 6.5 to 7.5, 9.84 kg of demulsifier is added to it, and stirred evenly , stand still, separate water and xylene formaldehyde resin solution;

[0073] Pour the xylene formaldehyde resin solution into the debenzene kettle, and under the condition of 150°C, decompress and remove the unreacted xylene. When the viscosity of the resin reaches 300cp / 25°C, it is...

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Abstract

The invention provides a method for preparing a xylene formaldehyde resin. The method comprises the following steps that (a) under the catalyzing of sulfuric acid, polymerization reaction is conducted on dimethylbenzene and aldehyde compounds, and polymerization reaction liquid is acquired, wherein the aldehyde compounds comprise formaldehyde and / or paraformaldehyde; (b) the sulfuric acid in the polymerization reaction liquid is isolated, a xylene solution of the xylene formaldehyde resin is acquired; (c) the xylene solution of the xylene formaldehyde resin, water, an alkaline neutralization agent and a demulsifier are mixed, static placing and laying are conducted, and the xylene formaldehyde resin is acquired. According to the method, in the process of isolating the xylene formaldehyde resin, the demulsifier is added, so that the xylene and the resin can be effectively isolated with the water and the sulfuric acid, the quality and yield of the prepared xylene formaldehyde resin are improved, and isolation operation is simple and thorough.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a method for preparing xylene formaldehyde resin. Background technique [0002] The basic information of xylene formaldehyde resin is: 1. Chemical structure; 2. Performance indicators: Appearance light yellow to brown viscous transparent liquid Specific gravity 1.06-1.10 Non-volatile content ≥ 90% Active oxygen content 9-12% Viscosity 70-150mPa · S acid value ≤0.3mgKOH / g 3. Application: 1. The molecular structure of xylene formaldehyde resin contains active groups such as hydroxyl and ether bonds, and more than 80% of the molecular composition is xylene methine structure, so it can dissolve For a variety of polymers, such as polyvinyl chloride, nitrocellulose, perchlorethylene, polyurethane, epoxy resin, unsaturated polyester resin, melamine resin and so on. It can play the role of plasticizing and toughening, increasing bonding strength, improving gloss and reducing cost. 2. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G10/02
Inventor 江成真孟祥金焦秋岭张娟邢介明
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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