Paper dry strength agent, preparation method of paper dry strength agent and application of paper dry strength agent

Abstract

The invention relates to a paper dry strength agent as well as a preparation method and application of the paper dry strength agent, and belongs to the technical field of assistants added into paper pulp. The paper dry strength agent is prepared by polymerizing nonionic biological polysaccharide with a molecular weight of 0.5-2 million, alkenyl carboxylic acid and / or a corresponding carboxylate, alkenyl sulfonic acid and / or a corresponding sulfonate, positive ions and alkenyl amide containing an unsaturated double bond. The preparation method of a retention aid for papermaking comprises the following steps: carrying out polymerization reaction and obtaining a product. The paper dry strength agent prepared by the biological polysaccharide graft copolymerization method provided by the invention is good in use effect and has a wide market prospect and good social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of additives added to pulp, and in particular relates to a paper dry strength agent, a preparation method of the paper dry strength agent and an application thereof. Background technique [0002] Paper dry strength agent is a fine chemical used to enhance the bond between fibers to improve the physical strength of paper (stiffness, tensile strength, ring compression strength, burst strength, etc.) without affecting its wet strength. The application of dry strength agent can avoid problems such as increased paper tightness, increased wet deformation, decreased opacity, absorbency, air permeability and even tearing degree caused by increased beating degree. [0003] At present, the dry strength agent for papermaking is mainly amphoteric multi-component copolymerization polyacrylamide, and its preparation patents include the initial simple three-way or four-way copolymerization, and the current multi-component ...

AI Technical Summary

Problems solved by technology

[0005] With the rapid development of the printing and packaging industry, the demand for industrial cultural paper and packaging cardboard is increasing, and the quality requirements for paper are getting higher and higher, especially for the strength requirements, which are not strong enough for cultural paper. During the printing process, due to folding, there will be shutdowns, shelves, etc., and the packaging paper is prepared into cartons. It is required that the cartons have sufficient mechanical strength, no deformation, no cracks, and can withstand the impact and push of external forces during storage and transportation. This requires sufficient strength, and my country's papermaking raw materials are mainly non-wood fibers with short fibers and low strength, such as herb plants and waste paper pulp, which have low paper stiffness, poor ring compressive strength, and low bursting strength. Especially in recent years, the utilization rate of waste paper resources in my country has been increasing year by year, and the development potential is huge, but the increase in the utilization rate of waste paper means that the number of recycling of waste paper will increase, which will cause a sharp drop in paper strength indicators, so further research is needed. Open up a new type of dry strength agent to meet the actual needs of paper production

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