Production method of anti-interference paper intensifier

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...

AI Technical Summary

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 cationic monomers, it is difficult to complete the copolymerization in the above-mentioned method, and even the homopolymerization rate is far away. Higher than the copolymerization rate, but failed to obtain the amphoteric polymer multi-polymer copolymer with uniform distribution of cations in the polymer molecular structure

[0005] In recent years, with the application of waste paper recycled pulp, the content of miscellaneous ions in the pulp and white water system has increased relatively, which has interfered with the papermaking process and greatly reduced the performance of ordinary paper strengthening agents. How to make full use of the preparation method of the application performance of polymer paper strengthening agent under the interference condition has not been found in the patent or literature.

At the same time, in the process of practical application of amphoteric polymer multi-polymer copolymers, the molecular chain structure of amphoteric polymer multi-polymer copolymers with a low degree of crosslinking is easily broken due to the influence of external force shearing, resulting in a decrease in its performance. None of the methods mentioned above relate to the preparation method for improving the degree of polymer crosslinking

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