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Paper strengthening agent, method for producing paper strengthening agent, paper

A paper strength enhancer, amphoteric technology, applied in the direction of enhancer addition, etc., can solve the problems of insufficient effect, polluted paper strength, decline, etc., and achieve the effect of small texture disorder, excellent compressive strength, and excellent paper strength enhancement effect.

Active Publication Date: 2018-01-19
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the amphoteric polyacrylamide that remained in the pulp increased in the paper stock, causing problems such as pollution and a decrease in paper strength
[0005] As an amphoteric polyacrylamide that is not easily affected by environmental changes in the papermaking system, for example, Patent Document 1 describes that a predetermined amount of acrylamide, cationic vinyl monomer, and anionic vinyl monomer are prepared in a predetermined order. A material obtained by reacting a body and a cross-linking monomer, but its effect is insufficient

Method used

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  • Paper strengthening agent, method for producing paper strengthening agent, paper
  • Paper strengthening agent, method for producing paper strengthening agent, paper
  • Paper strengthening agent, method for producing paper strengthening agent, paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Add 276.2 parts of ion-exchanged water to a reaction vessel equipped with a stirrer, a thermometer, a reflux cooling pipe, a nitrogen gas introduction pipe, and three dropping funnels (hereinafter referred to as funnel 1, funnel 2, and funnel 3 in turn.) Nitrogen gas was directly blown into the exchanged water to remove oxygen in the reaction container, and then the temperature of the ion-exchanged water was set to 90°C.

[0095] Next, 60 parts of benzyl chloride quaternary salt containing 18.6 parts of acrylamide, 39.5 parts of dimethylaminoethyl methacrylate and dimethylaminoethyl methacrylate as the monomer mixture (I) were further mixed with sulfuric acid. 23.8 parts of aqueous solution, 2.0 parts of itaconic acid, 0.3 parts of N,N-dimethylacrylamide, 0.3 parts of methylenebisacrylamide, 3.2 parts of sodium methallylsulfonate, 19.3 parts of 62.5% sulfuric acid and ion An aqueous solution of 117.0 parts of water was exchanged to adjust to pH 4.5, and the resulting mi...

Embodiment 2～8

[0101] Except for changing the monomer mixture (I) and the monomer mixture (II) to the composition shown in Table 1, the aqueous solution of the amphoteric polyacrylamide used in Examples 2 to 8 was obtained by the same method as in Example 1. (The solid content concentration is 20.3%).

Embodiment 9

[0103] 276.2 parts of ion-exchanged water was added to the same reaction vessel as in Example 1, oxygen in the reaction vessel was removed by blowing nitrogen gas directly into the ion-exchanged water, and the temperature of the ion-exchanged water was then set to 90°C.

[0104]Next, the monomer mixture (II) (pH 4.5 aqueous solution) having the composition shown in Table 1 was added to the funnel 1, and the mixture (I) (aqueous solution) having the composition shown in Table 1 was further added to the funnel 2.

[0105] Next, an initiator solution containing 0.6 parts of ammonium persulfate and 180 parts of ion-exchanged water was charged into the funnel 3 .

[0106] Next, the cocks of funnel 1 and funnel 3 were opened simultaneously, and the entire amount of the monomer mixture (II) and half of the initiator solution were added dropwise over 2 hours. Then, the cock of the funnel 2 was immediately opened, and the entire amount of the monomer mixture (I) and the remaining half ...

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Abstract

The present invention provides a novel amphoteric polyacrylamide-based paper strength enhancer which is easy to remain in pulp, does not easily turn the zeta potential of pulp into positive, has excellent paper strength enhancement effect, and does not disturb the texture of the finished paper. The paper strength enhancer contains amphoteric polyacrylamide that meets the following requirements [1] to [3]: [1] acrylamide (a), cationic vinyl monomer (b) containing α-methyl group, An anionic vinyl monomer (c) and a cross-linking monomer (d) are constituents [2] and amphoteric polyacrylamides [3] in which the ratio of the constituent (b) in the constituents is 1 to 20 mol % The above-mentioned amphoteric polyacrylamide has a high magnetic field side absorption band A and a low magnetic field side absorption band B attributable to the α methyl group of the component (b) in the range of 0.9 ppm to 1.35 ppm in the 1H-NMR spectrum, and the The area ratio As / (As+Bs) of the area (As) of the absorption band A to the area (Bs) of the absorption band B is 20% or more.

Description

technical field [0001] The present invention relates to a paper strengthening agent, a method for producing the paper strengthening agent, and paper. Background technique [0002] Conventionally, amphoteric polyacrylamide obtained by copolymerizing acrylamide, cationic vinyl monomer, anionic vinyl monomer, and cross-linking monomer as needed has been widely used as a paper strength enhancer. The increase of waste paper in the pulp slurry (paper stock) causes short fiberization and deterioration of the pulp. Therefore, an amphoteric polyacrylamide that can be retained on the pulp more and exhibits a high paper strength reinforcing effect is expected. [0003] In order to improve the retention rate of pulp, for example, it is only necessary to increase the amount of cationic groups in amphoteric polyacrylamide, but such amphoteric polyacrylamide has a strong cohesive force, resulting in disordered paper texture (ground joint) , and the effect of paper strength enhancement is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/18C08F220/56
Inventor 水河哲岛本胜浩井冈浩之广濑国博津田五轮夫
Owner ARAKAWA CHEM IND LTD
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