Polyacrylamide-based dry paper-strengthening agent, and paper manufacturing method

A technology of polyacrylamide and polyacrylamide, which is applied in the field of polyacrylamide-based internal paper strength agent and papermaking, and the field of polyacrylamide-based paper-strength agent, which can solve problems such as good

Active Publication Date: 2012-12-05
SEIKO PMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in these inventions, the papermaking system that does not add an aluminum compound such as aluminum sulfate or polyaluminum chloride (PAC) as a fixation accelerator of the paper strength strengthening agent to the pulp slurry, or the paper that is used even if a large amount of paper is added In the case of a papermaking system where the paper strength enhancement effect is not improved, not only the paper quality is good, but also the paper strength enhancement effect and the water drainage improvement effect are very satisfactory.

Method used

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  • Polyacrylamide-based dry paper-strengthening agent, and paper manufacturing method
  • Polyacrylamide-based dry paper-strengthening agent, and paper manufacturing method
  • Polyacrylamide-based dry paper-strengthening agent, and paper manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] 547.80 g of water, 201.70 g of a 50% aqueous acrylamide solution as monomers (1), dimethylaminoethyl methacrylate, and 12.26 g of ester, 5.07 g of itaconic acid, 1.16 g of N,N-dimethylacrylamide, and 1.97 g of sodium methallylsulfonate were adjusted to pH 3.0 with 12.02 g of 30% sulfuric acid aqueous solution. Next, the temperature was raised to 60°C under a nitrogen atmosphere, and 0.24 g of an aqueous solution of ammonium persulfate was added as a polymerization initiator to initiate polymerization, and the reaction temperature was raised to 90°C. Thereafter, 49.20 g of water, 8.60 g of 30% sulfuric acid aqueous solution, 136.68 g of 50% acrylamide aqueous solution, 8.17 g of dimethylaminoethyl methacrylate, 1.69 g of itaconic acid, and N,N-dimethylacrylic acid were added. Add 0.48 g of persulfuric acid to the monomer (2) composed of 0.77 g of amide and 0.90 g of sodium methallyl sulfonate. When the estimated viscosity at 25° C. reaches 3000 mPa·s, add 49.45 g of wate...

Embodiment 2～9、 comparative example 1～7

[0078] In addition to changing the composition of monomers (1) and monomers (2) as shown in Table 1, and changing the viscosity of the paper strength agent in the polyacrylamide system as shown in Table 2, and Example 1 Carry out likewise, obtained polyacrylamide system internal paper strength agent. As in Example 1, the obtained polyacrylamide-based internal paper strength agent was adjusted to a solid content of 20.0%, pH 3.0, and the stringiness, viscosity (25°C), and weight-average molecular weight were measured. Table 2 shows the ratio of the calculated weight-average molecular weight to the viscosity.

[0079] Table 1

[0080]

[0081]

[0082]

[0083] The abbreviations in Table 1 correspond to the following substances.

[0084] AAm: acrylamide

[0085] M: Dimethylaminoethyl methacrylate

[0086] DMBz: Dimethylaminoethyl Methacrylate Benzyl Ammonium Chloride Quaternary Ammonium Chloride

[0087] DABz: Dimethylaminoethyl Acrylate Benzyl Chloride Quaternary ...

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Abstract

The present invention is: a polyacrylamide-based dry paper-strengthening agent containing amphoteric polyacrylamide, the polyacrylamide-based dry paper-strengthening agent being characterized in that the amphoteric polyacrylamide is obtained by polymerizing (a) 70-99.8 mol% of (meth)acrylamide, (b) 0.1-15 mol% of a cationic vinyl polymer, and (c) 0.1-15 mol% of an anionic vinyl polymer, the weight-average molecular mass (A) of the polyacrylamide-based dry paper-strengthening agent is 2,000,000-10,000,000, the ratio [(A) / (B)] between the weight-average molecular mass (A) and the B-type viscosity (B)(mPas) of a 20 mass% aqueous solution obtained by adjusting the polyacrylamide-based dry paper-strengthening agent so that the solids concentration in the polyacrylamide-based dry paper-strengthening agent is 20 mass% at 25 DEG C is equal to or greater than 500, and the thread length in a 20-mass% aqueous solution at 25 DEG C is 5-60 mm; and a method for manufacturing paper-in which the polyacrylamide-based dry paper-strengthening agent is used.

Description

technical field [0001] The invention relates to a polyacrylamide-based internal paper-strengthening agent and a papermaking method, in particular to a polyacrylamide-based internal paper-strengthening agent with good paper quality, excellent paper strength enhancement effect and water drainage, and the use of the polyacrylamide-based internal paper-strengthening agent. Papermaking method of adding paper strength agent. Background technique [0002] In order to improve the productivity or improve the quality of paper accompanying the increase in the speed of the paper machine, various paper strength enhancers containing polyacrylamide-based internal paper strength agents are used in the papermaking process. In particular, improvements in polyacrylamide-based internal paper strength agents are being advanced in order to improve paper quality and productivity. [0003] For example, as a paper strength enhancer with excellent paper strength such as rupture coefficient and Z-axi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/37
CPCC08F220/56D21H17/375D21H21/18D21H17/36
Inventor 茨木英夫西隆之佐藤健
Owner SEIKO PMC CORP
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