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Paper surface sizing agent and preparation method thereof

A surface sizing agent and paper technology, applied in the direction of paper, papermaking, water repellent addition, etc., can solve the problems of reduced Cobb value, unstable paper quality, obvious moisture return, etc., to reduce paper weight and simplify sizing Process, cost reduction effect

Active Publication Date: 2008-03-26
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) Use waste paper instead of wood pulp, but the strength of the paper is poor and the water absorption value is high
[0005] 3) Due to the many variable factors of internal sizing, the paper quality is unstable and the grade is difficult to improve, which makes manufacturers use less or give up internal sizing and use surface sizing to make up for it has become a popular trend
[0007] However, the current surface sizing agent has the phenomenon of returning to moisture, that is, the Cobb value of the paper will decrease significantly after being stored for a period of time, and this phenomenon is especially obvious in low temperature and humid environments
[0008] Chinese patent CN1944792 discloses a sizing agent, although it can achieve the effect of improving the ring pressure strength and curing speed; but its moisture return phenomenon is still obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In a 1000ml four-neck flask equipped with a condenser, a dropping device, a stirrer and a thermometer, add 52 grams of gelatin with a molecular weight of 10000 and 257.4 grams of distilled water, and heat up to 85°C to dissolve. Cool down to 45°C.

[0035] Add 52 grams of 25% tetradecyl polyoxyethylene (15) trimethylammonium chloride, heat to 95 ° C, add 13 grams of 20% ammonium persulfate, and add the following mixed monomers dropwise: 52 grams of styrene, diacrylic acid 78 grams of methylaminoethyl monochloromethane quaternary ammonium, 52 grams of N-butoxymethacrylic acid, and 10.4 grams of n-butyl acrylate were added in 1 hour. The reaction was maintained at 95°C for 1 hour, cooled to 35°C, pH = 2.0. Filter through a 100-mesh filter screen to obtain a sizing agent for paper surface treatment, with a solid content of 39.8%, an average particle size of 21 nm (measured by a Malven particle size analyzer), and a cationic degree of 0.2 (measured by the method of GB12309...

Embodiment 2

[0037] In a 1000ml four-necked flask equipped with a condenser, a dropping device, a stirrer and a thermometer, add 2.6 grams of gelatin with a molecular weight of 100,000 and 495.4 grams of distilled water, and heat up to 85°C to dissolve. Cool down to 45°C. Add 13 grams of 10% lauryl polyoxyethylene (20) trimethyl ammonium chloride, add 13 grams of 50% potassium persulfate, add the following mixed monomers dropwise: 91 grams of methyl styrene, dimethyl methacrylate Amino ethyl ester monochloromethane quaternary ammonium 13 grams, divinylbenzene 2.6 grams, 13 grams of isooctyl methacrylate, 6 hours add up. The reaction was maintained at 40°C for 2 hours, cooled to 25°C, pH = 5.0. Filter through a 100-mesh filter screen to obtain a sizing agent for paper surface treatment, with a solid content of 20.2%, an average particle size of 49 nm (measured by a Malven particle size analyzer), and a cationic degree of 0.02 (measured by the method of GB12309-90).

Embodiment 3

[0039] In a 1000ml four-neck flask equipped with a condenser, a dropping device, a stirrer and a thermometer, add 9.4 grams of gelatin with a molecular weight of 80,000 and 455.7 grams of distilled water, and heat up to 85° C. to dissolve. Cool down to 45°C. Add 4 grams of 10% tetradecyl polyoxyethylene (8) trimethylammonium chloride, heat to 60 ° C, add 1 gram of 20% sodium persulfate, and drop the following mixed monomers: 60 grams of styrene, methyl 15 grams of dimethylaminoethyl acrylate monochloromethane quaternary ammonium, 25 grams of diallyl dimethyl ammonium chloride, 30 grams of aminoethyl acrylate, and 60 grams of methyl methacrylate were added in 4 hours. The reaction was maintained at 60°C for 2 hours, cooled to 35°C, pH = 3.5. Filter through a 100-mesh filter screen to obtain a sizing agent for paper surface treatment, with a solid content of 30.3%, an average particle size of 79nm (measured by a Malven particle size analyzer), and a cationic degree of 0.14 (mea...

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Abstract

The present invention relates to paper surface treating agent, and is especially one kind of paper surface sizing agent and its preparation process. The paper surface sizing agent is prepared with cationic monomer, cross-linking monomer, (methyl) acrylate monomer and (methyl) styrene, and through free radical emulsion polymerization in mixture emulsion comprising dispersant, emulsifier and initiator. It has high performance and environment friendship. It is applied in sizing paper surface together with starch to raise the compression strength of paper, raise Cobb value and improve other performance of paper.

Description

technical field [0001] The invention relates to a paper surface treatment agent, in particular to a paper surface sizing agent and a preparation method thereof. Background technique [0002] The development trend of paper, especially corrugated paper and cardboard is as follows: [0003] 1) It is developing from high grammage to low grammage. [0004] 2) Use waste paper instead of wood pulp, but the strength of the paper is poor and the water absorption value is high. [0005] 3) Due to the many variable factors of internal sizing, the paper quality is unstable and the grade is difficult to improve, which makes manufacturers use less or give up internal sizing and use surface sizing to make up for it has become a popular trend. [0006] Requirements for the sizing agent used for the above-mentioned surface sizing: a) increase the ring compressive strength; b) greatly reduce the Cobb value (water absorption value); c) fast curing speed, and it is required to be cooked immed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/35D21H17/37
Inventor 施晓旦王养臣田久旺尹东华黄庆毅
Owner SHANGHAI DONGSHENG NEW MATERIALS
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