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Sizing agent and preparation method therefor

A technology of sizing agent and cross-linking agent, applied in the field of papermaking, can solve the problems of easy delamination, wear of sizing roller, insufficient stability, etc., and achieve the effects of improving printability, low cost and high stability

Inactive Publication Date: 2013-10-30
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above problems, the industry also uses a combined emulsion of starch and pigment to replace the sizing agent to sizing paper, but the stability of this combined emulsion is not enough, the glue and pigment are easy to separate, and the sizing roller is worn out. Risk, long-term high-speed operation has a negative impact on the control of the papermaking system and the smoothness of papermaking

Method used

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  • Sizing agent and preparation method therefor
  • Sizing agent and preparation method therefor
  • Sizing agent and preparation method therefor

Examples

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preparation example Construction

[0012] Sizing agent among the present invention is mainly made of starch, crosslinking agent and pigment, and the preparation method of this sizing agent mainly comprises the following steps:

[0013] (1) Take several starches, such as corn starch, tapioca starch, potato starch, potato starch, etc., or a mixture of several of them.

[0014] In practical applications, the sizing agent can better improve the physical properties of paper by selecting the morphology of starch granules and the ratio of straight chain and branched chain in starch. For example, the shape of the starch granules is preferably one or more of polygonal, oval, and round, and the starch is preferably a starch with a straight chain of 17-30% and a branched chain of 70-83%, or more preferably a straight chain. The chain is 18-25%, and the branched chain is 75-82% starch. In addition, the particle size of the starch is a commonly used starch particle size, such as 5-100 μm.

[0015] (2) Take 20-120% of the ...

Embodiment 1

[0023] Take 100 grams of starch with 20% linear chain and 80% branched chain, 20 grams of heavy calcium carbonate pigment with a particle size of less than 2 μm and more than 60%, 0.5 grams of polyamide polyurea formaldehyde resin, add water to make the solid content reach 30% . On the basis of thorough mixing, cook at a temperature of 100-110°C for 40 minutes and a stirring speed of 70 rpm. Use this emulsion to sizing the paper, the paper used is base paper, and the basis weight of the paper is 67g / m 2 , the sizing amount is 8g / m 2 , the effect is as follows:

[0024]

[0025] Note: RI strength, paper surface strength, refers to the bonding strength between paper surface fibers, glue, fillers or between paper surface coating particles and between coating and paper base. It indicates the paper's resistance to ink splitting during printing. ability. The test method is as follows: cut the paper to be evaluated into a size of 1.5*21cm, use black ink No. 15, rotate 3 times ...

Embodiment 2

[0031] Select 80g of starch with 17% linear chain and 83% branched chain to cook, the temperature is controlled at 110-120°C, the time is 50min, the stirring speed is 90rpm, and 60g of light calcium carbonate pigment with an average particle size of less than 1.4μm, zirconium carbonate Ammonium 2g is added with water to adjust the solid content to 40%, fully mixed, and the obtained emulsion is used to sizing the paper. The paper used is base paper, and the basis weight of the paper is 82g / m 2 , sizing 10g / m 2 , the effect is as follows:

[0032]

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Abstract

Provided are a sizing agent and a preparation method therefor. The method comprises the following steps. First, some starch is taken. Second, a pigment weighing 20-120% of absolute dry weight of the starch are taken, the pigment can be mineral formed by hydrated aluminum silicates, and the content of the mineral with a particle size of less than 1 micron is 95-99%, or the pigment is talcum powder with a sheet structure and processed by electric charges, and the content of the talcum powder with a particle size of less than 2 microns is not less than 95%, or the pigment is heavy calcium carbonate, and the content of heavy calcium carbonate with a particle size of less than 2 microns is not less than 60%, or the pigment is light calcium carbonate with an average particle size of 0.35-0.45 micron. Third, cross-linking agents weighing 0.2-3% of absolute dry weight of the starch are taken, and the cross-linking agents are amino resin, ammonium zirconium carbonate, polyamide epoxy resin, polyamide polyamine epichlorohydrin resin, polyamide polyurea resin, glyoxal and melamine glyoxal. Fourth, the starch, the pigments and the cross-linking agents and water are mixed and boiled together at the temperature of 100-130 DEG C for 40-60 min.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a sizing agent for papermaking and a preparation method thereof. Background technique [0002] In the papermaking process, the water resistance, covering performance and strength of the paper are mainly controlled by the sizing agent for internal sizing and surface sizing of the paper. The existing sizing agent is through starch and different types of sizing. The sizing agent is selected from the group consisting of alkyl ketene dimers (Alkyl Ketene dimmers, AKD) derivatives, styrene / acrylate copolymers, styrene / acrylic copolymer dispersions, alkyl ketene dimmers Polymer / alkylsulfonic acid ester (Alkylsulfonic Acid Ester, ASE) copolymer, etc. However, this type of sizing agent is very limited in improving the performance of paper. For example, the sizing agent prepared by using 50-100 parts by weight of starch plus 1-10 parts by weight of the above-mentioned sizing agent is used for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 王仁荣张明吴勇许立兵
Owner GOLD EAST PAPER JIANGSU
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