Production method of anti-interference paper intensifier

A paper strengthening agent and initiator technology, which is applied in the field of polymer compound preparation, can solve the problems of reducing the performance of ordinary paper strengthening agents, the molecular chain structure is prone to breakage, and the product has a single variety of functional groups, achieving significant retention and drainage. Effect, enhanced retention and drainage effect, good fluidity effect

Active Publication Date: 2009-07-22
广州星业科技股份有限公司
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Problems solved by technology

For example, Xu Qinglin et al. first prepared non-ionic polyacrylamide, modified the polyacrylamide by adding cationic reagents by controlling the Hoffman reaction, and made the amphoteric polyacrylamide quaternized. This method has a single variety of product functional groups, and the reaction is not easy to control. Molecular weight distribution is uneven; Yin Weifen et al. synthesized amphoteric polyacrylamide by copolymerizing modified acrylamide with acrylic acid and acrylonitrile, introducing cationic groups through ammonolysis of nitrile groups, and adding initiators step by step to control molecular weight. The copolymerization rate of this method is not high, and the product Poor storage stability; Wu Quancai introduced cationic groups by copolymerization of cationic monomers, and free radical polymerization occurred in aqueous solution at one time. This method also has problems such as low copolymerization rate and poor storage stability of the product, and it is easy to appear during the polymerization process. Polymerization, gel phenomenon
[0004] In addition, in the preparation process of amphoteric polymer multi-polymer copolymer initiated polymerization, due to the large difference in the reactivity ratios of anion and catio

Method used

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  • Production method of anti-interference paper intensifier
  • Production method of anti-interference paper intensifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 950g of pure water into the four-neck flask, start stirring, and then add 85.0g (1.2mol) of acrylamide, 3.5g (0.0486mol) of acrylic acid, 18.6g (0.090mol) of methacryloyloxyethyltrimethylammonium chloride ), 4.2g (0.018mol) of sodium 2-acrylamide-2-methylpropanesulfonate, adjust the pH to 4.0, then pass nitrogen to remove oxygen, and simultaneously raise the temperature of the reaction system to 55°C, and then sequentially add a mass concentration of 1% 9.6g of N,N-methylenebisacrylamide aqueous solution, 13.8g of 10% sodium methallyl sulfonate aqueous solution and 3.5g of 10% ammonium persulfate aqueous solution are used to initiate polymerization, and the reaction releases Heat, the temperature rises to 90°C, and after the polymerization reaction is carried out for 20 minutes, add 7.5 g of 2,2-azo-bis(2-amidinopropane) hydrochloride aqueous solution with a mass concentration of 10%, keep it warm, and keep it at 85°C for 30 minutes. , Add 60 g of sodium sulfite aqu...

Embodiment 2

[0035] Add 950g of pure water into the four-neck flask, start stirring, and then add 85.0g (1.2mol) of acrylamide, 5.8g (0.081mol) of acrylic acid, 14.3g (0.091mol) of dimethylaminoethyl methacrylate, 2- 5.2g (0.023mol) of sodium acrylamide-2-methylpropanesulfonate, adjust the pH to 4.5, then pass nitrogen to remove oxygen, and at the same time raise the temperature of the reaction system to 55°C, and then add vinyl toluene with a mass concentration of 1% in sequence 13.5 g of aqueous solution, 7.6 g of mercaptoethanol aqueous solution with a mass concentration of 10%, and 4.2 g of ammonium persulfate aqueous solution with a mass concentration of 10%, initiate polymerization, the reaction exotherms, the temperature rises to 96 ° C, and the polymerization reaction is carried out for 26 minutes. 10% 1-((cyano-1-methylethyl)azo)formamide aqueous solution 8.7g, keep warm, keep at 90°C for 60min, then add 60g of 10% sodium sulfite aqueous solution to terminate the reaction. A copol...

Embodiment 3

[0036]Add 950g of pure water into the four-neck flask, start stirring, and then add 85.0g (1.2mol) of acrylamide, 2.2g (0.031mol) of acrylic acid, 4.5g (0.035, 2.5%) of itaconic acid, dimethyl methacrylate 15.7g (0.1mol) of aminoethyl ester, 5.8g (0.025mol) of sodium 2-acrylamide-2-methylpropanesulfonate, adjust the pH to 5.0, then pass nitrogen to remove oxygen, and at the same time raise the temperature of the reaction system to 55°C, Then add successively the N that mass concentration is 1%, N-methylenebisacrylamide aqueous solution 10.5g, mass concentration are 10% sodium methallyl sulfonate aqueous solution 4.4g, mass concentration are 10% ammonium persulfate aqueous solution 5.2g, initiate polymerization, the reaction is exothermic, the temperature rises to 93 ° C, and after the polymerization reaction is stable for 35 minutes, add 11.6% of 2,2-azo-bis(2-amidinopropane) hydrochloride aqueous solution with a mass concentration of 10%. g, heat preservation, after keeping a...

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Abstract

The invention provides a method for preparing anti-interference paper reinforcing agent, comprising the steps as follows: (1) according to molar percentage, 80-96% of acrylamide monomer, 1-10% of double-bonded carboxylic acid monomer, 1-15% of water-soluble cation monomer and 1-5% of 2-acrylamide-2-methyl propane sulfonate monomer are taken and added in water while stirring to prepare a mixed water solution; (2) the pH value of the water solution is adjusted to 4.0-5.0; under the protection of nitrogen, the temperature is increased to 50-70 DEG C; subsequently, crosslinking agent, molecular weight regulator and prophase initiator are added so that the polymerization reaction is carried out for 20-35min; and (3) later initiator is added in the outcome in step (2), with the temperature kept within 80-100 DEG C for 30-60min; subsequently, termination agent is added so that the polymerization reaction is stopped. The method is stable and controllable, and can obtain the product which has strong anti-interference capability, high crosslinking degree, good flowability, complete copolymerization, low residue, uniform distribution of cations, and stable and controllable viscosity during the polymerization process.

Description

technical field [0001] The invention belongs to the technical field of polymer compound preparation, and in particular relates to a preparation method of an amphoteric polyacrylamide anti-interference paper strengthening agent. Background technique [0002] my country's paper industry is in a stage of rapid development. Due to the shortage of wood resources in our country, grass and waste paper are mostly used in paper production at present, but the fibers are short, the strength is not high, and the content of miscellaneous ions is high, which interferes with paper making. Extremely, in order to meet the demand for high-grade, low-weight paper, it is necessary to add a strengthening agent to improve the strength performance of the paper. Although the amphoteric polyacrylamide strengthening agent commonly used in the market to improve the dry strength of paper has improved the adaptability of waste paper raw material pulp to a certain extent, it is not suitable for some short...

Claims

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Application Information

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IPC IPC(8): D21H21/18
Inventor 陈文育孟巨光
Owner 广州星业科技股份有限公司
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