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Dry strength agent for coated paper and preparation method of dry strength agent

A technology of dry strength agent and initiator, which is applied in the field of papermaking additives and its preparation, can solve the problems of poor polymer viscosity and molecular weight repeatability, failure to greatly improve paper strength, gelation, etc., and achieve control of polymerization reaction rate , Increase binding force, not easy to gel effect

Inactive Publication Date: 2015-05-20
孙高雷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents all involve comonomers to modify polyacrylamide, but none of them involve the use of polyene monomers and acrylate monomers with hydroxyl groups to modify polyacrylamide. The strength of paper when wood pulp, straw pulp or waste paper pulp, and the reaction control of the copolymerization of acrylamide monomer in the prior art has defects, the viscosity and molecular weight of the obtained polymer are poor in repeatability, and often gelation phenomenon

Method used

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  • Dry strength agent for coated paper and preparation method of dry strength agent

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Under the protection of an inert gas, add 500 parts of high-purity deionized water, 100 parts of acrylamide, 5 parts of dimethyl diallyl ammonium chloride, 5 parts of acrylic acid, and persulfuric acid into a four-necked flask with a stirring device. Potassium-sodium bisulfite 0.15 parts, disodium hydrogen phosphate 0.2 parts, stirred at room temperature for 15 minutes, heated up and controlled the reaction temperature at 60°C for 45 minutes, then added 1 part of 2-hydroxyethyl acrylate, after the addition was completed, then Add 0.1 parts of potassium persulfate-sodium bisulfite, and control the reaction temperature at 60°C for 30 minutes, raise the temperature and control the reaction temperature at 80°C, then add 0.5 parts of trimethylolpropane triacrylate dropwise, react for 20 minutes, add 0.1 part of n-dodecylmercaptan, stop stirring, lower the temperature to 25° C., and discharge to obtain a dry strength agent with a weight solid content of 21.2% and a viscosity o...

Embodiment 2

[0033] Under the protection of an inert gas, add 500 parts of high-purity deionized water, 100 parts of acrylamide, 5 parts of dimethyl diallyl ammonium chloride, 5 parts of acrylic acid, and persulfuric acid into a four-necked flask with a stirring device. Potassium-sodium bisulfite 0.15 parts, disodium hydrogen phosphate 0.2 parts, stirred at room temperature for 15 minutes, heated up and controlled the reaction temperature at 60°C for 45 minutes, then added 1 part of 2-hydroxyethyl acrylate, after the addition was completed, then Add 0.1 parts of potassium persulfate-sodium bisulfite, and control the reaction temperature at 60°C for 30 minutes, raise the temperature and control the reaction temperature at 80°C, then add 1.5 parts of trimethylolpropane triacrylate dropwise, react for 20 minutes, add 0.1 part of n-dodecylmercaptan, stop stirring, lower the temperature to 25° C., and discharge to obtain a dry strength agent with a weight solid content of 21.4% and a viscosity o...

Embodiment 3

[0035] Under the protection of an inert gas, add 500 parts of high-purity deionized water, 100 parts of acrylamide, 5 parts of dimethyl diallyl ammonium chloride, 5 parts of acrylic acid, and persulfuric acid into a four-necked flask with a stirring device. Potassium-sodium bisulfite 0.15 parts, disodium hydrogen phosphate 0.2 parts, stirred at room temperature for 15 minutes, heated up and controlled the reaction temperature at 60°C for 45 minutes, then added 1 part of 2-hydroxyethyl acrylate, after the addition was completed, then Add 0.1 parts of potassium persulfate-sodium bisulfite, and control the reaction temperature at 60°C for 30 minutes, raise the temperature and control the reaction temperature at 80°C, then add 3 parts of trimethylolpropane triacrylate dropwise, react for 20 minutes, add 0.1 part of n-dodecylmercaptan, stop stirring, lower the temperature to 25° C., and discharge to obtain a dry strength agent with a weight solid content of 21.5% and a viscosity of ...

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Abstract

The invention discloses a dry strength agent for coated paper and a preparation method of the dry strength agent. The dry strength agent is prepared by carrying out copolymerization modification on an acrylamide monomer (serving as a main monomer), a cationic monomer, an anionic monomer, a functional monomer and a cross-linking monomer. Since the polymeric monomer formula, polymerization reaction process parameters, feeding mode and other factors influencing the polymerization reaction are optimized, the tensile strength, tearing index and folding strength of the coated paper are obviously improved by use of the prepared dry strength agent,.

Description

technical field [0001] The invention relates to an auxiliary agent for papermaking and a preparation method thereof, in particular to a dry strength agent for coated paper and a preparation method thereof. Background technique [0002] There is a shortage of wood pulp in my country, especially long-fiber wood pulp. Many coated papers on the market use long-fiber wood pulp and need to be matched with short-fiber hardwood pulp, straw pulp and recycled pulp. This will inevitably lead to a decrease in paper strength. The strength requirements are higher than other ordinary writing papers, otherwise it is easy to break and lose hair, so it is necessary to take measures to improve the strength of the paper. The dry strength of paper is one of the structural characteristics of paper. The dry strength is mainly obtained with the formation of fiber network and the bonding between fibers after drying. The strength mainly depends on the strength of individual fibers and the degree of bo...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/28C08F222/14C08F226/02C08F220/34C08F220/06C08F222/02C08F228/02C08F2/38C08F4/40D21H21/18
Inventor 孙高雷
Owner 孙高雷