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Method for manufacturing paperboard

A manufacturing method and technology of cardboard, applied in the field of cardboard manufacturing, can solve the problems of poor retention of paper strength enhancer and inability to give full play to the effect of paper strength enhancer, so as to solve the problems of retention, paper strength, etc. Enhanced Effects with Excellent Effects

Active Publication Date: 2013-12-18
SEIKO PMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, when aluminum sulfate is hardly used in papermaking at pH 6.5 to 8.5, the retention of the paper strength enhancer becomes poor, and the paper strength enhancement effect of the paper strength enhancer cannot be fully exerted.

Method used

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  • Method for manufacturing paperboard
  • Method for manufacturing paperboard
  • Method for manufacturing paperboard

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0117] Put 610.1 g of ion-exchanged water, 315.17 g of 50% acrylamide aqueous solution, 19.28 g of dimethylaminoethyl methacrylate, and 2- Acrylamide-N-glycolic acid 14.22g, 1,3,5-triacryloylhexahydro-1,3,5-triazine (triacrylformal) 0.06g, sodium methallyl sulfonate 1.97g, then put into 30 % sulfuric acid aqueous solution 15.93g, take PH3.0, heat up to 60 ℃ under nitrogen atmosphere. Then, 5.59 g of a 5% ammonium persulfate aqueous solution was added as a polymerization initiator, and the temperature was raised to 90° C. under a nitrogen atmosphere, and the temperature was kept. One hour after the start of the polymerization, 11.17 g of 5% ammonium persulfate was additionally added, and the polymerization was stopped 2 hours after the start of the reaction. After cooling, a polymer-containing aqueous solution with a solid content of 20.1%, a viscosity (using a Brookfield rotational viscometer at 25° C.) of 7500 mPa·s, and a pH of 2.9 was obtained. The properties of the obtai...

manufacture example 2～8、 comparative manufacture example 1～3

[0119] As shown in Table 1, except that the types and molar ratios of (A) to (F) components were changed, the same operation as in Production Example 1 was carried out to obtain a polymer-containing aqueous solution. The properties of the obtained polymer-containing aqueous solution are shown in Table 2.

manufacture example 9

[0121]Put 576.0 g of ion-exchanged water, 315.23 g of 50% acrylamide aqueous solution, 19.28 g of dimethylaminoethyl methacrylate, and 50% 14.53 g of glyoxylic acid, 2.33 g of sodium methallyl sulfonate, and then 15.25 g of 30% sulfuric acid aqueous solution was added to obtain a pH of 3.0, and the temperature was raised to 60° C. under a nitrogen atmosphere. Then, 5.59 g of a 5% ammonium persulfate aqueous solution was added as a polymerization initiator, and the temperature was raised to 90° C. under a nitrogen atmosphere, and the temperature was kept. One hour after the start of the polymerization, 11.17 g of 5% ammonium persulfate was additionally added, and the polymerization was stopped 2 hours after the start of the reaction. After cooling, a polymer-containing aqueous solution with a solid content of 20.0%, a viscosity of 6400 mPa·s, and a pH of 2.8 was obtained. The properties of the obtained polymer-containing aqueous solution are shown in Table 2.

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Abstract

This invention is a method for manufacturing paperboard, the method having an exceptional paper-strength-improving effect and yield-improving effect, and the method being characterized in comprising adding a papermaking additive to a pulp slurry; the pulp slurry being used having a papermaking pH of 6.5-8.5 after the additive has been added; the papermaking additive being synthesized using a monomer (A) capable of forming the repeating unit represented by general formula (A) through polymerization, a cationic vinyl monomer (C) in an amount of 1-20 mol% relative to the total monomer content of the polymerization system, a (meth)allyl sulfonic acid and / or a salt thereof (D) in an amount of 0.01-5 mol% relative to the total monomer content of the polymerization system, and glyoxylic acid or a monomer (B) capable of forming the repeating unit represented by general formula (B) through polymerization; and the papermaking additive containing a polymer having a repeating unit expressed by general formula (B). In the formulae, R1 represents H or CH3, R2 represents H or CH3, and R3 represents H, Na, K, or NH4.

Description

technical field [0001] The present invention relates to a method for producing cardboard, and more particularly to a method for producing cardboard excellent in both retention and strength, using a (meth)acrylamide-based copolymer as an additive for papermaking. Background technique [0002] In the production of cardboard, since it is difficult to obtain high-quality cardboard, it is generally produced under acidic conditions. However, in recent years, since the calcium carbonate content in the used paper used as a cardboard raw material tends to increase, it is difficult to reduce the pH of the papermaking system, so the increase in the use of aluminum sulfate or sulfuric acid, or the increase in sulfate ions and calcium carbonate caused by sealing The increase of the content causes the reaction product of aluminum sulfate and calcium carbonate, that is, calcium sulfate (gypsum) to increase in the papermaking system, and it is precipitated in the papermaking process to caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/10C08F8/28C08F220/56C08F228/02D21H17/37D21H17/44
CPCD21H17/37D21H17/44D21H21/10D21H21/18
Inventor 铃木洋大川典子久米田和宽小国正祥
Owner SEIKO PMC CORP
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