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Surface paper strength agent, coating liquid, and method for producing paper

A technology of paper strength strengthening agent and aqueous solution, which is applied in the direction of strengthening agent addition, papermaking, textiles and papermaking, etc. It can solve the problems of insufficient paper strength enhancement effect and achieve excellent paper strength enhancement effect

Active Publication Date: 2019-10-11
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology also focuses on the permeability of paper strength enhancers, using acrylic acid as a carboxyl group-containing monomer, but the paper strength enhancement effect is not sufficient

Method used

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  • Surface paper strength agent, coating liquid, and method for producing paper
  • Surface paper strength agent, coating liquid, and method for producing paper
  • Surface paper strength agent, coating liquid, and method for producing paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Add 522 parts of ion-exchanged water to a reaction device equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen gas introduction tube, and two dropping funnels, feed nitrogen gas to remove oxygen in the reaction system, and heat to 85°C. Separately, 767.8 parts of 50% AM aqueous solution, 5.6 parts of DMAA, 26.8 parts of SMAS, 3.7 parts of IA and 305 parts of ion-exchanged water were put into the dropping funnel (1). In addition, 1.5 parts of APS and 150 parts of ion-exchanged water were charged into the dropping funnel (2). Then, it was added dropwise to the reaction device (1) from the dropping funnel (1) and the dropping funnel (2) over 3 hours. After the dropwise addition, 0.5 parts of APS and 10 parts of ion-exchanged water were added, and when the estimated viscosity measured by a B-type viscometer reached about 550 mPa·s (temperature 25° C., solid content concentration 20%), the polymerization was terminated and carried out. After cooling, polym...

Embodiment 2～9、 comparative example 1～5

[0080] Using the same method as in Example 1, it was converted into the monomer components shown in Table 1 and synthesized to obtain components (A-2) to (A-9) and (B-1) to (B-5) Ingredients. In addition, since (B-2) component gelled during manufacture, it was not used for the following evaluation.

[0081] [Preparation of aqueous solution for turbidity measurement]

[0082] 10 parts of aluminum sulfate·14-18 hydrate (manufactured by Wako Pure Chemical Industries, Ltd.) and 990 parts of ion-exchanged water were mixed in advance to prepare an aqueous aluminum sulfate solution with a solid content concentration of 1%. Next, after mixing 5 parts of component (A-1) (solid content: 1 part) and 45 parts of ion-exchanged water, 50 parts of the above-mentioned aluminum sulfate aqueous solution was added to prepare an aqueous solution for turbidity measurement (solid content concentration-(A) ingredients 1%, aluminum sulfate 0.5%). Moreover, the aqueous solution was prepared similar...

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Abstract

The present invention provides a surface paper strength agent, a coating liquid, and a method for producing paper, the surface paper strength agent having an excellent paper strength enhancing effectespecially for paper containing an aluminum compound such as aluminum sulfate. The invention relates to a surface paper strength agent, which contains a polymer (A) of a monomer component including a(meth) acrylamide (a1), an N-substituted (meth) acrylamide (a2), an unsaturated monomer (a3) having a sulfonic acid group, and an alpha, beta-unsaturated dicarboxylic acid (a4). The turbidity of an aqueous solution containing 1 wt% of a component (A) and 0.5 wt% of aluminum sulfate in terms of solid concentration is 70-1500 NTU at pH 6.5.

Description

technical field [0001] The present invention relates to a surface paper strength enhancer, a coating solution and a method for producing paper. Background technique [0002] In recent years, an increase in the distribution of recovered paper pulp and a reduction in the weight of the base paper itself have been carried out in response to demands such as improvement of environmental awareness and cost reduction. Therefore, it is difficult to maintain the paper strength due to the influence of inclusions such as fine fibers and calcium ions contained in the paper only by adding a paper strength enhancer inside the raw material pulp. In order to supplement the strength, the surface of the base paper is coated with Surface paper strength enhancer such as starch and polyacrylamide. In addition, in the surface coating, due to the increase in productivity, the speed of the paper machine has also been increased, and the application of the film transfer method such as the gate roll t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/18D21H21/14
CPCD21H21/18D21H21/14
Inventor 相野谷卓山平康裕谷安尚
Owner ARAKAWA CHEM IND LTD
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