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Preparation method of N-N'-methylene diacrylamide

A technology of methylenebisacrylamide and acrylamide, which is applied in organic chemistry and other fields, can solve problems such as high production cost, unstable products, and environmental pollution, and achieve the effects of low production cost, improved product quality, and fewer by-products

Active Publication Date: 2012-06-27
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickeners and adhesives of acrylamide used in the market generally have the following problems: 1. The product is unstable during storage and transportation, and the free aldehyde is too high; 2. The production cost is high; 3. The product purity is low; 4. .Pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of N-N′-methylenebisacrylamide, the steps of the preparation method are:

[0022] (1). Add 245kg of water to the reactor, turn on the stirring, and heat to 70°C;

[0023] (2). Then add 75kg of acrylamide, 105kg of formaldehyde, and at the same time add the polymerization inhibitor p-hydroxyanisole, the amount of which is 100~500ppm, and stir at 40℃ for 1 hour to fully react;

[0024] (3). Then add 75kg of acrylamide and 45kg of catalyst hydrochloric acid, heat to 70°C with stirring, react for 2 hours, and cool for 48 hours;

[0025] (4). The product is filtered out and dried at 80°C to obtain the finished product of N-N'-methylenebisacrylamide.

Embodiment 2

[0027] A preparation method of N-N′-methylenebisacrylamide, the steps of the preparation method are:

[0028] (1). Add 250kg of water into the reactor, turn on the stirring, and heat to 65°C;

[0029] (2). Then add 75kg of acrylamide, 100kg of formaldehyde, and at the same time add the concentration inhibitor phenothiazine, the amount of which is 50~300ppm, and stir for 1.2 hours at 45℃ to fully react;

[0030] (3). Then add 75kg of acrylamide and 50kg of catalyst sulfuric acid, heat to 65°C with stirring, react for 2.3 hours, and cool for 43 hours;

[0031] (4). The product is filtered out and dried at 75°C to obtain the finished product of N-N'-methylenebisacrylamide.

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Abstract

The invention belongs to a method for preparing N-N'-methylene-bisacrylamide which belongs to the chemical reagent field. Acrylamide and formaldehyde are used raw materials, and the N-N'-methylene-bisacrylamide is prepared by reaction in the presence of sulphuric acid or hydrochloric acid used as a catalyst and solvent. A reaction system also comprises one or several of hydroquinone, p-hydroxyanisole and phenothiazine. The prepared N-N'-methylene-bisacrylamide has stable performance, low production cost, good thickening performance and slight excitation to human skin. The invention optimizes the reaction environment required by the production, has fewer byproducts and improves the product quality greatly; and in particular, the application of the catalyst ensures that the purity and the yield of the product are improved obviously.

Description

Technical field [0001] The invention belongs to the field of chemical reagents, and in particular relates to a preparation method of N-N′-methylenebisacrylamide. Background technique [0002] N-N′-methylenebisacrylamide (molecular formula: C 7 H 10 N 2 O 8 ), which is widely used as a chemical reagent. It is used in the textile industry to produce thickeners and adhesives, and in oil mining to produce leak-stopping agents. It is also widely used in leather chemicals, printing and many other fields. It is a quality product that is widely used in the market. It is a stable, high-purity, good-performance cross-linking agent that belongs to the acrylamide thickeners and adhesives. The acrylamide thickeners and adhesives currently used on the market generally have the following problems: 1. The product is unstable during storage and transportation, and the free aldehyde is too high; 2. The production cost is high; 3. The product purity is low; 4 .Polluting to the environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C233/38
Inventor 叶嘉瑜
Owner TIANJIN CHEM REAGENT RES INST
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