Emulsion drying strengthening agent for paper and preparation method thereof

A technology of dry strength agent and emulsion, applied in the direction of reinforcing agent addition, etc., can solve the problems of paper tensile strength, ring compressive strength, tear resistance and folding resistance at the same time, and achieve high active ingredients and ring compressive strength And the effect of improving the folding resistance, improving the dry strength and tear resistance

Inactive Publication Date: 2007-12-12
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to factors such as the acceleration of paper machine speed, the emergence of some special papers and the improvement of printing machinery, the use of the above additives alone often cannot meet the requirements of improving the tensile strength, ring compression strength, tear resistance and folding resistance of paper at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 400 grams of deionized water, 2.25 grams of nonionic emulsifier AE-7 (fatty alcohol polyoxyethylene ether) and 1.07 grams of cationic emulsifier 1631 (hexadecane trimethylammonium chloride), warming up to 60°C, adding 2 grams of initiator ammonium persulfate, 9 grams of styrene and 75 grams of methyl acrylate, reacting at this temperature for 1 hour, and then adding 6 grams of initiator dropwise Ammonium persulfate is a mixed monomer consisting of 4 grams of acrylonitrile, 10 grams of acrylamide with a concentration of 40% by weight and 8 grams of methacryloyloxyethyltrimethylammonium chloride. After the dropwise addition is completed within 4 hours, the system is warmed up to 75°C and reacted at this temperature for 2 hours. Under stirring, add a sodium hydroxide solution with a weight concentration of 30% to adjust the pH to 6.5 Room temperature, discharging, the solid content obtained is 18.6%, and the viscosity is 45mpa.s.

Embodiment 2

[0032] Add 350 grams of deionized water, 2.25 grams of nonionic emulsifier Tween-80 (polyoxyethylene sorbitan monooleate) and 1.07 grams of cationic emulsifier in a four-necked flask equipped with a condenser, a thermometer and stirring 1831 (octadecyltrimethylammonium chloride), warming up to 65 ° C, adding 1.2 grams of initiator sodium persulfate, 15 grams of styrene and 70 grams of methyl acrylate mixed monomer, after the dropwise addition, here Reaction at high temperature for 1.5 hours, then drip 2.3 gram initiator sodium persulfate, be 40% acrylamide and 6 gram methacryloyloxyethyltrimethylammonium chloride by 3 gram acrylonitrile, 15 gram weight concentration composed of mixed monomers. After the dropwise addition is completed within 3 hours, the system is heated up to 80° C., and reacted at this temperature for 3 hours, adding a sodium hydroxide solution with a weight concentration of 30%, adjusting the pH value to 7.0, cooling to room temperature, and discharging , t...

Embodiment 3

[0034] Add 320 grams of deionized water, 2.25 grams of nonionic emulsifier Tween-80 (polyoxyethylene sorbitan monooleate) and 1.07 grams of cationic emulsifier in a four-necked flask equipped with a condenser, a thermometer and stirring 1831 (octadecyltrimethylammonium chloride), warming up to 65 ° C, adding 0.21 grams of initiator potassium persulfate, 3 grams of styrene and 80 grams of methyl acrylate mixed monomer, after the dropwise addition, the React at high temperature for 1.5 hours, then dropwise add 0.42 grams of initiator potassium persulfate, a mixture of 8 grams of acrylonitrile, 5 grams of 40% acrylamide and 7 grams of methacryloyloxyethyltrimethylammonium chloride monomer. After the dropwise addition is completed within 2 hours, the temperature of the system is raised to 85° C., and the reaction is carried out at this temperature for 4 hours, and a sodium hydroxide solution with a weight concentration of 30% is added to adjust the pH value to 6.5-7.0, and the tem...

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Abstract

The invention discloses an emulsion strength-increasing agent which is special for papers and its preparation method, the preparation method includes the following steps: reacting the initiating agent, the mixed monomer combined with phenylethene and acrylic ester, water and composite emulsifier 0.5-1.5 hours and under 50-65deg.Cwhich total amount is 0.2-2.0%; drip-adding the excess mixing monomer combined by the initiating agent, acrylic nitrile, water-solubility monomer and basic ion monomer, the drip-adding time is 2-5 hours; heating the body system temperature to 75-90deg.C after the drip-adding is completed, and reacting 1-4 hours under the temperature; adjusting pH valve to 6.5-8.0 and the product is prepared. The emulsion strength-increasing agent in the invention has the advantages of small particle size, easy adsorbing, high effective ingredients, stable performance and etc.; it can be used in the wet part adding when paper making, it can significantly improve the dry strength and tear resistance of paper, at the same time, the ring compression strength and folding resistance of paper is markedly improved.

Description

technical field [0001] The invention relates to a wet-end additive for papermaking, in particular to an emulsion dry strength agent for paper and a preparation method thereof. technical background [0002] Due to the shortage of wood resources, the raw materials used in large quantities for papermaking are mainly straw pulp, reed pulp and waste paper pulp. These raw materials have seriously affected the strength of paper and cardboard due to their shortcomings such as short fibers, high miscellaneous cell content, and high water retention value. Therefore, a dry strength agent needs to be added. [0003] At present, the dry strength agents used are mainly anionic and cationic starches, cationic polyacrylamides, amphoteric cationic polyacrylamides or graft copolymers. Such as "CPAM Synthesis and Enhancement of Corrugated Base Paper Ring Compression Strength" ("Paper Chemicals and Applications" 2003, No. 3, pp. 20-22) and the technology disclosed in US Patent US5543446. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/18D21H17/35D21H17/37
Inventor 施晓旦李改霞
Owner SHANGHAI DONGSHENG NEW MATERIALS
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