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Surface sizing agent for papermaking, surface sizing coating liquid and paper

A surface sizing agent and water-based emulsion technology, which is applied in papermaking, paper coating, textiles and papermaking, etc., can solve the problems of manufacturing adverse effects, friction coefficient reduction, time-consuming, etc., and achieve the suppression of friction coefficient reduction and sizing effect good effect

Active Publication Date: 2011-11-30
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The AKD-based surface sizing agent obtained by dispersing AKD in water has a good sizing effect, but there is a problem that it takes time for the sizing effect to appear
In addition, when using AKD-type surface sizing agents, since the coefficient of friction of paper is lowered, there is a problem of limited use
In addition, AKD-based surface sizing agents have problems in terms of stability with respect to machine sharing (siere), and therefore, there is also a problem that aggregates are generated when they are applied to paper, and the aggregates become dirt and cause problems in the production of paper. bring adverse effects
According to this method, although the reduction of the friction coefficient can be improved, there is a problem that the sizing effect is deteriorated due to the addition of the water-soluble polymer compound

Method used

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  • Surface sizing agent for papermaking, surface sizing coating liquid and paper
  • Surface sizing agent for papermaking, surface sizing coating liquid and paper
  • Surface sizing agent for papermaking, surface sizing coating liquid and paper

Examples

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Embodiment

[0048] The following examples and comparative examples are given to specifically describe the present invention, but the present invention is not limited to these examples. In addition, in each example, parts and % are all based on weight unless otherwise indicated.

Synthetic example 1

[0050] Into a flask equipped with a stirrer, a condenser, a dropping funnel, a nitrogen inlet tube, and a thermometer, put 70 parts of styrene, 30 parts of dimethylaminoethyl methacrylate, 42.9 parts of isopropanol, and 2,2'- 2.5 parts of azodiisobutyronitrile were polymerized at 80 to 85° C. for 5 hours while stirring under a nitrogen stream. Next, 11.5 parts of acetic acid and 300 parts of water were added. Then, 17.7 parts of epichlorohydrin were added to the obtained copolymer, and kept at 80° C. for 2 hours to quaternize the copolymer to form a cationic copolymer compound, and then further add a predetermined amount of water to obtain a solid The component concentrations were adjusted to 20% to obtain a cationic water-soluble polymer (B1). Table 1 shows the viscosity and pH of the obtained cationic water-soluble polymer (B1). In addition, viscosity was measured by putting a sample into a 225 ml mayonnaise bottle, and using a BM type viscometer (manufactured by TOKIMEC) ...

Synthetic example 2～8

[0052] In the same manner as in Synthesis Example 1, except that the type and amount of monomers used for synthesis and the amount of epichlorohydrin used for quaternization were changed as shown in Table 1 in Synthesis Example 1 The reaction was carried out to obtain various cationic water-soluble polymers (B2 to B8) having a solid content concentration of 20%. Table 1 shows the viscosity and pH at 25° C. of the obtained cationic water-soluble polymers (B2 to B8).

[0053] Table 1

[0054]

[0055]The notation in the table is as follows. St: Styrene, BA: Butyl Acrylate, MMA: Methyl Methacrylate, DMA: N,N-Dimethylaminoethyl Methacrylate, DMAA: N,N-Dimethylaminopropyl Acrylamide, ECH: Epichlorohydrin

[0056] In addition, the usage-amount of a component (b1) - a component (b3) shows a weight part, and the usage-amount of a quaternization agent shows the molar ratio with respect to a component (b2) or a component (b3).

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Abstract

PROBLEM TO BE SOLVED: To provide a papermaking surface sizing agent and a surface sizing coating liquid with which good sizing effect can be obtained, the decrease of frictional coefficient is suppressed and the agglomerate generated during coating on paper can be reduced, and to further provide a paper with excellent sizing effect.SOLUTION: A papermaking surface sizing agent of aqueous emulsion type is used which includes polymer (C) obtained by polymerization of vinyl monomer (A) including hydrophobic monomer (a1) in the presence of cationic water soluble polymer (B), a water soluble aluminium compound (D) and alkyl ketene dimer and / or alkenyl ketene dimer (E).

Description

technical field [0001] The present invention relates to a surface sizing agent for papermaking, a surface sizing coating liquid and paper. Background technique [0002] The surface sizing agent for papermaking is a sizing agent coated on the surface of paper, and can effectively impart a sizing effect. As surface sizing agents for papermaking, those obtained by dispersing alkyl ketene dimers and alkenyl ketene dimers (hereinafter both collectively referred to as AKD) in water, those having cationic functional groups A polymer dispersed in water, etc. [0003] The AKD-based surface sizing agent obtained by dispersing AKD in water has a good sizing effect, but there is a problem that it takes time to develop the sizing effect. In addition, when the AKD type surface sizing agent is used, since the coefficient of friction of the paper is lowered, there is a problem that the application is limited. In addition, AKD-based surface sizing agents have problems in terms of stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H19/00
Inventor 川喜田正之野村浩原口刚士横谷贤治
Owner ARAKAWA CHEM IND LTD
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