Paper coating adhesive prepared from excess sludge extract protein and preparation method of paper coating adhesive

A technology of excess sludge and sludge protein, applied in paper coating, coating, papermaking, etc., can solve the problems of difficulty in guaranteeing reaction efficiency and effect, leakage of hydrophobic groups, complex protein components, etc., and achieve coating thermal Good stability, improved solubility, and easy collection

Inactive Publication Date: 2019-03-19
TIANJIN UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0006] The protein components extracted from the remaining biological sludge are complex, and the protein molecules range from 5,000 to 60,000 Daltons. The protein comes from a variety of mixed microbial flora, and the composition is quite different. Poor water, the reaction efficiency and effect are difficult to guarantee

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0036] The excess sludge protein extract is the excess sludge protein extract produced by Tianjin Yuchuan Microbial Products Co., Ltd. It is the excess protein extract obtained by alkali extraction from the excess sludge of urban sewage treatment plants. The protein content is 33%, and the solid content for 42%.

[0037] In the process of alcohol analysis, first heat the sludge protein extract to 70°C, then add 95% ethanol solution equal to the volume of the sludge protein extract, stir for 15 minutes, centrifuge at 3000rpm to separate the precipitate, and take the solid matter to vacuum dry and pulverize at 60°C , to obtain the protein extracted from the remaining sludge. The protein content of the protein extracted from the remaining sludge is 67%.

[0038] Take an appropriate amount of remaining sludge to extract protein, add water to prepare a 15% suspension, stir, adjust the pH value to 8.0 with alkali, then raise the temperature to 70°C, and add chloroacetic acid that i...

Embodiment 2

[0045] The excess sludge protein extract is the excess sludge protein extract produced by Tianjin Yuchuan Microbial Products Co., Ltd. It is the excess protein extract obtained by alkaline extraction of excess sludge from urban sewage treatment plants. The protein content is 35%, and the solid content is 35%. 45%.

[0046] In the alcohol precipitation process, firstly, the sludge protein extract is heated to 65°C, and then 95% ethanol solution with 1.2 times the volume of the sludge protein extract is added, stirred for 15 minutes, centrifuged at 3000rpm to separate the precipitate, and the solid matter is vacuum-dried at 60°C. Pulverize to obtain the protein extracted from the remaining sludge. The protein content of the protein extracted from the remaining sludge is 65%.

[0047] Take an appropriate amount of remaining sludge to extract protein, add water to make a 12% suspension, stir, adjust the pH value to 7.5 with alkali, then raise the temperature to 65°C, add chloroac...

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Abstract

The invention relates to a method for preparing a paper coating adhesive from excess sludge extract protein. The method includes: (1) subjecting excess activated sludge to alkaline extraction to obtain sludge protein extract liquid, performing alcohol precipitation to obtain sludge extract protein, and modifying the sludge extract protein serving as a raw material to prepare the paper coating adhesive; (2) subjecting the sludge extract protein obtained through alcohol precipitation to carboxymethylation modification to improve dissolvability and hydrophilicity of the sludge extract protein; (3) adopting a RATF technique for graft modification on the sludge extract protein subjected to carboxymethylation modification to prepare the modified sludge protein based paper coating adhesive. The film forming performance and water resistance of the modified protein are improved, and the paper coating adhesive is used for partially substituting styrene-butadiene latex / styrene-acrylic latex for paper coating processing.

Description

technical field [0001] The invention belongs to the field of coating aids for coated processed paper, in particular to a method for preparing paper coating adhesives by using excess sludge to extract protein. Background technique [0002] The pulp and paper industry is a traditional processing industry in my country. At present, my country's paper output has exceeded 100 million tons, accounting for more than a quarter of the world's total, and it is the world's largest producer and consumer. In addition, with the continuous improvement of people's living standards, people's demand for coated paper continues to increase, so the demand for coating adhesives is also increasing year by year. At present, the coating adhesives used in the market are mainly synthetic latex adhesives, such as styrene-butadiene latex, styrene-acrylic latex, etc., and a small amount of biological latex such as starch and protein are used in a small amount. Synthetic latex is not only relatively expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/14C08F212/08C08H1/00D21H19/14D21H19/16D21H19/20D21H19/22
CPCC08F289/00C08H1/00D21H19/14D21H19/16D21H19/20D21H19/22C08F220/14
Inventor 刘廷志孔话峥赵梦醒王燕燕
Owner TIANJIN UNIV OF SCI & TECH
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