N-methylol acrylamide and preparation thereof

A technology of methylolacrylamide and acrylamide, applied in the field of N-methylolacrylamide and its preparation, can solve the problems of dangerous solvents, poor environmental protection performance, strong toxicity, etc., and achieve high product quality and good environmental protection performance , less toxic effect

Inactive Publication Date: 2009-06-24
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation method of N-methylolacrylamide has the following deficiencies: 1. The solvents used are all dangerous goods; 2. The pollution is large and the environmental performance is poor; 3. The toxicity is strong; 4. The cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of N-methylolacrylamide, its composition and weight (kg) are:

[0033] Acrylamide 60

[0034] Paraformaldehyde 20

[0035] water 15

[0036] sodium methoxide 2.

[0037] The steps of a preparation method of N-methylolacrylamide are:

[0038] (1). Fully stir and mix acrylamide, paraformaldehyde, water, p-hydroxyanisole, and sodium methoxide in the reaction kettle according to the proportion to form a mixed solution, and the addition amount of polymerization inhibitor p-hydroxyanisole is 100-500ppm ; Then open the steam valve to control the heating rate;

[0039] (2). The catalyst sodium methoxide is added at a vapor pressure of 0.5-1Mpa and a temperature of 40°C;

[0040] (3). When the temperature rises to 60°C, keep it for 1.5 hours, the reaction ends, cooling and crystallization produces crystals;

[0041] (4). The crystals are dehydrated by a dehydrator and dried to obtain the finished product.

Embodiment 2

[0043] Acrylamide 50

[0044] Paraformaldehyde 15

[0045] water 25

[0046] Sodium carbonate 5.

[0047] The polymerization inhibitor in the reaction system is phenothiazine, and the addition amount is 50-300ppm.

[0048] The steps of its preparation method are the same as in Example 1.

Embodiment 3

[0050] Acrylamide 45

[0051] Paraformaldehyde 25

[0052] water 20

[0053] sodium hydroxide 6.

[0054] The polymerization inhibitor in the reaction system is selected from hydroquinone, and the addition amount is 0-200ppm.

[0055] The steps of its preparation method are the same as in Example 1.

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PUM

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Abstract

The invention relates to a N-methylolacrylamide and a preparation method thereof, belonging to the fine chemistry industry field. Acrylamide and paraformaldehyde are used as raw materials, and the N-methylolacrylamide is prepared by reaction in the presence of a catalyst and solvent; wherein, one or several of parahydroxyben-zaldehyde, hydroquinone and phenothiazine are added in a reaction system. The invention optimizes the reaction environment required by the production, has fewer byproducts and improves the product quality and the yield correspondingly, and the invention has simple technology and convenient use and is safe and environment-friendly.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to N-methylolacrylamide and a preparation method thereof. Background technique [0002] Acrylamide series are widely used as a crosslinking monomer, and N-methylolacrylamide is more widely used as the main variety of the crosslinking monomer. The existing preparation method of N-methylolacrylamide has the following disadvantages: 1. The solvents used are all dangerous goods; 2. The pollution is large and the environmental performance is poor; 3. The toxicity is strong; 4. The cost is high. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a high-quality, low-cost, high-yield, low-emission, non-polluting, simple process, easy-to-use N-methylolacrylamide and its preparation method . [0004] The technical scheme that the present invention realizes purpose is: [0005] A kind of N-methylola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/18C07C231/12
Inventor 张春强
Owner TIANJIN CHEM REAGENT RES INST
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