Preparation method of dry strength agent for food-grade paper

Abstract

The invention discloses a preparation method of a dry strength agent for food-grade paper, which comprises the following steps: (1) preparing the following raw materials in parts by weight: 40-55 parts of acrylamide, 0.3-1 part of anionic polymerization monomer, 1-3 parts of cationic polymerization monomer, 0.01-0.05 part of chelating agent, 0.05-0.2 part of inorganic acid, 0.1-0.5 part of molecular weight regulator, 0.03-0.1 part of initiator, 0.05-0.15 part of terminator and 40-60 parts of deionized water; and (2) adding an amide solution, anionic and cationic polymerization monomers, a chelating agent, inorganic acid, a molecular weight regulator and half of deionized water into a reaction kettle, and uniformly conducting stirring. According to the preparation method of the dry strength agent for the food-grade paper, the residual amount of the acrylamide monomer of the dry strength agent for the food-grade paper is less than 0.001%, and the dry strength agent can be safely suitable for the processes of production and manufacturing of the food paper, subsequent food processing and packaging and the like. The product can effectively increase the bonding area and bonding strength among fibers in papermaking paper under the condition of ensuring food safety, effective hydrogen bonding is formed, and the mechanical strength of the paper is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of a dry strength agent for food-grade paper. Background technique [0002] Paper is the most commonly used item in people's daily life. With the advancement of science and technology and the upgrading of consumer demand, the market demand for paper is increasingly showing trends such as individualized demand, specialized application, large-scale supply and resource recycling. The corresponding papermaking industry will also develop towards enterprise scale, technology integration, product diversification, production cleanliness, resource conservation, forestry and paper integration and industrial globalization. my country's packaging paper mainly uses waste paper as raw material for production. The main waste paper importing countries are the United States, the United Kingdom, and Japan. The United States is the main source. The waste paper market is...

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Problems solved by technology

[0003] Domestic waste paper has been reused many times, and the performance indicators of the finished paper cannot be guaranteed in terms of raw material structure and quality. For this, functional additives need to be added to improve its strength. However, the quality of paper strengthening agents on the market is uneven. It will cause fluctuations in the quality of the paper, and the physical indicators such as the folding index, bursting index, interlayer bonding strength and ring crushing strength of the paper after the use of the reinforcing agent have not been significantly improved. Therefore, we propose a food-grade Preparation method of dry strength agent for paper

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