A kind of paper water-repellent and moisture-proof agent and preparation method thereof

Abstract

The invention discloses a paper water-resistant moisture-proof agent and a preparation method thereof, and relates to the technical field of papermaking. The paper water-resistant moisture-proof agentcomprises the following components in parts by weight: 200 to 300 parts of a monomer, 5 to 20 parts of a non-ionic reactive monomer, 10 to 30 parts of a cationic reactive monomer, 5 to 15 parts of anon-ionic emulsifier, 1 to 10 parts of a cationic emulsifier, 10 to 30 parts of a hydrophobic aid, 0.1 to 1 part of an initiator, 5 to 10 parts of a molecular weight regulator and 400 to 600 parts ofwater. In the preparation process, the specific components of all the components and the mass ratio of all the components are controlled; the paper water-resistant and moisture-proof agent is used forpreparing paper, the water resistance of the paper can be obviously improved, the paper still has a high burst index and a high ring crush index after absorbing moisture, and the water-resistant andmoisture-proof requirements of various kinds of paper can be met.

Description

technical field [0001] The invention relates to the technical field of papermaking, and specifically discloses a water and moisture-proof agent for paper and a preparation method thereof. Background technique [0002] Paper or cardboard is a three-dimensional network structure material interwoven with countless fibers. The surface of plant fibers has a large number of hydroxyl groups, which have natural hydrophilicity. The cell cavity of the fiber itself has a fine tube structure, forming a three-dimensional network with the fibers. The capillary structure together acts as a capillary, so the paper or cardboard without any treatment has strong liquid absorption, and the liquid droplets quickly diffuse and penetrate on the paper surface, which is not suitable for writing and printing; at the same time, the strength of the paper decreases after absorbing moisture. Will affect paper usage. With the development of the times, the application of paper and paperboard is more and m...

AI Technical Summary

Problems solved by technology

[0002] Paper or cardboard is a three-dimensional network structure material interwoven with countless fibers. The surface of plant fibers has a large number of hydroxyl groups, which have natural hydrophilicity. The cell cavity of the fiber itself has a fine tube structure, forming a three-dimensional network with the fibers. The capillary structure together acts as a capillary, so the paper or cardboard without any treatment has strong liquid absorption, and the liquid droplets quickly diffuse and penetrate on the paper surface, which is not suitable for writing and printing; at the same time, the strength of the paper decreases after absorbing moisture. will affect paper usage

With the development of the times, the application of paper and paperboard is more and more extensive, but the hydrophilicity of paper products itself limits its application range to a certain extent, so a water and moisture-proof agent for paper is needed to make the prepared paper have Better water and moisture resistance, so as to ensure that the paper can be used normally for a long time

[0003] In order to solve the hygroscopicity of paper, the commonly used moisture-proof method is surface sizing method, the purpose of which is to make paper or paper have the ability to resist liquid, especially water or aqueous solution, diffusion and penetration. In modern papermaking technology, surface sizing It has become the main form of surface sizing treatment in the paper industry. Its function is to endow the paper with a certain degree of water resistance. Although surface sizing can improve the water resistance of paper, its air permeability will be significantly reduced. In the packaging industry, especially It is food packaging, time, humidity, temperature, gas, etc. will directly or indirectly affect the quality and shelf life of food. For some food packaging paper, if its air permeability is not good, it will cause "internal burning" phenomenon, thus affecting the quality of food , and most of the paper after sizing is not easy to recycle and degrade, so it affects the recycling of paper and is easy to pollute the environment. In order to solve this problem, more and more researches tend to be environmentally friendly Processing, such as biomass coating, mainly includes three categories: polysaccharides, proteins and oils

[0004] For example, Chinese patent application 201410805086.5 discloses a surface sizing agent for papermaking and a papermaking method for improving paper strength and water resistance. 95 high-molecular polysaccharide compound and layered silicate; this application uses polysaccharide materials to prepare water-resistant paper, polysaccharide materials have good film-forming properties and physical strength, and there are a large amount of The hydrogen bonds in the membrane can effectively block oxygen, nitrogen and carbon dioxide, but polysaccharide materials are sensitive to water and water vapor, and have poor barrier properties. Diffusion, so better moisture resistance cannot be achieved

[0005] In order to solve this problem and inspired by the microstructure of super-hydrophobic plants, super-hydrophobic coatings are applied in the field of papermaking. In order to make paper have hydrophobic properties, hydrophobic coatings can be used to block direct contact between water and fibers. Chinese patent application 201710751090.1 discloses a water and moisture-proof agent for paper, including monomers, cationic reactive monomers, nonionic reactive monomers, cationic emulsifiers, nonionic emulsifiers, and hydrophobic additives; wherein the cationic reactive monomers The mass is 5-20% of the mass of the monomer; the mass of the non-ionic reactive monomer is 2-4% of the mass of the monomer; the mass of the cationic emulsifier is 1-3% of the mass of the monomer; the non-ionic emulsifying The mass of the agent is 1-3% of the mass of the monomer; the mass of the hydrophobic additive is 3-10% of the mass of the monomer. At the same time, the water resistance of the paper is guaranteed, but according to the records of the present invention, its water resistance performance, especially the burst index and ring pressure index, still cannot meet the demand

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