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paper strength enhancer

A technology of paper strength enhancer and metal ions, which is applied in the direction of enhancer addition, papermaking, paper, etc., can solve the problems of difficulty in obtaining the effect of improving paper strength, the influence of electrical conductivity changes, and difficult paper strength.

Active Publication Date: 2022-07-29
SEIKO PMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to this method, it is difficult to obtain a satisfactory paper strength improvement effect in a papermaking system with an electrical conductivity exceeding 3mS / cm.
In addition, there is a problem that it is easily affected by changes in electrical conductivity, and it is difficult to stably exert the effect of improving paper strength.

Method used

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Examples

Experimental program
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Embodiment

[0064] Examples of the present invention are described below, but the present invention is not limited by these examples. It should be noted that unless otherwise stated, % is based on mass, and mol % is a ratio when the total amount of monomers is set to 100 mol %.

[0065] (Synthesis of component (B))

Synthetic example 1

[0067] Into a 1-liter four-necked flask equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen conduit, 280.00 g of water was put, and as monomers (1), 93.91 g (36.70 mol %) of a 50% aqueous solution of acrylamide, dimethacrylic acid 11.32 g (4.00 mol %) of dimethylaminoethyl methacrylate, 14.02 g (3.00 mol %) of 80% dimethylaminoethyl methacrylate methyl chloridequaternized aqueous solution, 76 % dimethylaminoethyl methacrylate benzyl chloride-quaternized aqueous solution 20.16g (3.00 mol%), 76% dimethylaminoethyl acrylatebenzyl chloride -quaternized) aqueous solution 19.17g (3.00mol%), sodium methallylsulfonate (sodium methallylsulfonate) 0.85g (0.30mol%), adjusted to pH3.0 with 30% sulfuric acid aqueous solution. Next, the temperature was raised to 65°C under a nitrogen atmosphere, ammonium persulfate was added as a polymerization initiator to start a polymerization reaction, and the temperature in the reaction vessel was raised to 90°C. Then, 359.00 g ...

Synthetic example 2～5

[0069]The same procedure as in Synthesis Example 1 was carried out, except that the amount of the crosslinkable monomer was changed as shown in Table 1, and the increased or decreased amount was supplemented with acrylamide to obtain aqueous copolymer solutions (B-2 to B- 5). The obtained aqueous copolymer solution was adjusted to a solid content of 15.0% and a pH of 3.0. Table 1 shows the results of the viscosity at 25°C measured with a Brookfield viscometer.

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Abstract

The object of the present invention is to provide a polyacrylamide-based paper strength enhancer with excellent paper strength enhancement effect. The technical solution is a paper strength enhancer, comprising the following (A) components and (B) components, characterized in that the monovalent or divalent metal ions contained in the paper strength enhancer calculated based on ICP analysis (but the above-mentioned The mass ratio of (A) component to the total of (A) component and (B) component is 0.02-0.25, excluding metal ion which is an ion paired with a carboxyl group in (A) component. (A) component: water-soluble polysaccharide having a carboxyl group; (B) component: (meth)acrylamide 55-99 mol %, cationic monomer 0.5-20 mol %, anionic monomer 0.5-15 mol % , 0-10 mol% polymer of other monomers.

Description

technical field [0001] The present invention relates to a paper strength enhancer having an excellent paper strength improvement effect. Background technique [0002] Conventionally, various additives for papermaking have been used in the papermaking process in order to improve workability, paper quality, and the like. From the viewpoints of reducing environmental burden and saving resources, closed-loop white water and the utilization of old paper have been promoted. As a result, the increase in inclusions represented by anionic trash derived from used paper raw materials, and the increase in electrical conductivity in the papermaking system are accelerated, and adversely affect paper quality, handling properties, and the like. Among the additives for papermaking, paper strength enhancers play an important role in improving paper quality or workability. Paper strength enhancer for deteriorating papermaking conditions. [0003] For example, Non-Patent Document 1 describes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/18D21H17/24D21H17/42D21H17/45
CPCD21H21/18D21H17/24D21H17/42D21H17/45D21H17/37
Inventor 山本慎也久米田和宽茨木英夫
Owner SEIKO PMC CORP
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