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Sizing agent for treating paper surface and its preparing method and use

A surface treatment and sizing agent technology, applied in the direction of adding water repellent, can solve the problems of slow curing speed, difficult to improve the grade, poor paper strength, etc., to improve the Cobb value, improve the ring pressure strength, and speed up the curing speed. Effect

Active Publication Date: 2007-04-11
SHANGHAI DONGSHENG NEW MATERIALS +1
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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] A sizing agent disclosed in Chinese patent CN1610708A, although it can reduce the Cobb value, can not obviously improve the ring compressive strength, and the curing speed is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 1000ml four-necked flask equipped with a condenser, a dropping device, a stirrer and a thermometer, add 5 grams of gelatin with a molecular weight of 10000 and 250 grams of distilled water, and heat up to 85° C. to dissolve. Cool down to 38°C. Add 100 gram weight concentration and be the aqueous solution of 25% stearyl polyoxyethylene (5) trimethylammonium chloride, be heated to 95 ℃, add 25 gram weight concentration 50% ammonium persulfate aqueous solution, dropwise add 50 gram weight simultaneously Concentration 50% dimethylaminoethyl methacrylate monochloromethane quaternary ammonium aqueous solution and the following mixed monomers: 175 grams of styrene and 20 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 20 nm (measured by a Malven pa...

Embodiment 2

[0025] In a 1000ml four-necked flask equipped with a condenser, a dropping device, a stirrer and a thermometer, add 20 grams of gelatin with a molecular weight of 20000 and 368.4 grams of distilled water, and heat up to 85°C to dissolve. Cool down to 30°C. Add the aqueous solution of 0.8 gram 25% lauryl polyoxyethylene (20) trimethyl ammonium chloride, add the aqueous solution of 2 gram weight concentration 50% potassium persulfate, dropwise add 60 gram weight concentration 50% methacrylic acid two Methylamino ethyl benzyl quaternary ammonium chloride aqueous solution and the following mixed monomers: 20 grams of methyl styrene, 28.8 grams of isooctyl methacrylate, added in 4 hours. The reaction was maintained at 30°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 20.1%, an average particle size of 29 nm (measured by a Malven particle size analyzer), and a cationic degr...

Embodiment 3

[0027] In a 1000ml four-necked flask equipped with a condenser, a dropping device, a stirrer and a thermometer, add 15 grams of gelatin with a molecular weight of 50,000 and 209.75 grams of distilled water, and heat up to 85° C. to dissolve. Cool down to 38°C. Add 6 grams of 25% hexadecyl polyoxyethylene (10) trimethylammonium chloride aqueous solution, heat to 85 ° C, add 4.5 grams of 50% sodium persulfate aqueous solution, and drop cationic monomer aqueous solution and mixing unit simultaneously. Body, add in 2 hours. Wherein, the cationic monomer aqueous solution is made up of 20 grams of weight concentration 50% dimethylaminoethyl methacrylate monochloromethane quaternary ammonium aqueous solution and 25 grams weight concentration 50% dimethylaminoethyl acrylate monochloromethane quaternary ammonium solution; The mixed monomer consisted of 63.75 grams of styrene and 45 grams of methyl methacrylate. The reaction was maintained at 85°C for 1 hour, cooled to 35°C, pH=3.5. ...

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Abstract

The present invention discloses one kind of paper surface sizing agent and its preparation process and application. The preparation process includes the free radical emulsion polymerization of dispersant, emulsifier, initiator, cationic monomer, (methyl) acrylate monomer and (methyl) styrene monomer at 30-95 deg.c for 2-6 hr. The dispersant is gelatin, and the initiator is persulfate. The paper surface sizing agent has high performance and environment friendship, and when it is used together with starch in sizing paper surface, it can raise the ring pressure strength greatly, improve Cobb value obviously and speed the curing obviously.

Description

technical field [0001] The invention relates to a sizing agent for paper surface treatment, a preparation method and application 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 unstable quality of paper caused by many variable factors in internal sizing, and the difficulty of improving the grade, it has become a popular trend for manufacturers to use less or abandon internal sizing and use surface sizing to make up for it. [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 immediately after ge...

Claims

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Application Information

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IPC IPC(8): D21H21/16
Inventor 施晓旦王养臣田久旺尹东华
Owner SHANGHAI DONGSHENG NEW MATERIALS
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