Papermaking additive, paper, and paper manufacturing method

A manufacturing method and additive technology, which is applied in the direction of adding paper forming aids, papermaking, and reinforcing agents, which can solve the problems of paper quality reduction and inability to obtain paper strength enhancement effects, and achieve excellent paper strength effects

Active Publication Date: 2021-04-02
SEIKO PMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, from the standpoint of considering the environment and improving workability, in the manufacture of paper, the utilization of old paper raw materials and water saving (white water recycling), or the reduction of aluminum sulfate in neutral papermaking to no As a result of aluminum sulfate, the problem of paper quality deterioration due to the increase of ash content in the papermaking raw material or the high conductivity of the papermaking system, etc.
[0005] However, in the prior art, when only a small amount of aluminum compound such as aluminum sulfate or polyaluminium chloride (PAC) is added to the pulp slurry as a fixing aid of a paper strength enhancer or without aluminum or used in papermaking systems with high water-saving white water recirculation rate and high electrical conductivity, or in papermaking systems where the paper strength enhancement effect reaches the limit even if a high amount of paper strengthening agent is added to the pulp slurry Sufficiently satisfactory paper strength enhancement cannot be obtained when

Method used

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  • Papermaking additive, paper, and paper manufacturing method
  • Papermaking additive, paper, and paper manufacturing method
  • Papermaking additive, paper, and paper manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] 323.60 g of water, 136.13 g of a 50% acrylamide aqueous solution as monomers (1), and 80% dimethyl methacrylate were charged into a 1-liter four-neck flask including a stirrer, a thermometer, a reflux cooling tube, and a nitrogen gas introduction tube. Aminoethyl ester methyl chloride quaternary salt 36.35g, sodium methallylsulfonate (methallylsulfonate) 3.06g, N,N-dimethylacrylamide 0.28g, 1%N,N'-methylene bisacrylamide 4.32 g, adjusted to pH 3.0 with 30% sulfuric acid aqueous solution. Next, under a nitrogen atmosphere, the temperature was raised to 65°C, and ammonium persulfate was added as a polymerization initiator to start polymerization, and the reaction temperature was raised to 90°C. Then, ammonium persulfate was added, and when the polymerization rate reached 95%, 274.0 g of water, 229.48 g of 50% acrylamide aqueous solution, 7.29 g of itaconic acid, and 1.11 g of sodium methallylsulfonate were added, N,N -Monomers (2) of 0.28 g of dimethylacrylamide and 4.32...

Embodiment 2～4

[0112] Embodiment 2~4, embodiment 6~16,18,21 comparative example 1~4,6,7,9,10

[0113] Except changing the composition of monomers as shown in Table 4 and Table 5, and changing the viscosity of the additive for papermaking as shown in Table 6, it carried out similarly to Example 1, and obtained the additive for papermaking of a polyacrylamide type.

[0114] The obtained additive for papermaking was adjusted to a solid content of 20.0% and a pH of 3.0 in the same manner as in Example 1, and the results obtained by measuring viscosity, peak molecular weight, molecular weight distribution, and surface tension, and the peak molecular weight calculated from the measurement results Table 6 shows the ratio to the viscosity, the ratio of the anion equivalent to the cation equivalent calculated from the monomer composition, and the octanol / water partition coefficient.

Embodiment 5

[0116] 753.0 g of water, 329.07 g of 50% acrylamide aqueous solution, 32.45 g of 80% dimethylaminoethyl methacrylate methyl chloride quaternary salt are charged into a 1 liter four-necked flask comprising a stirrer, a thermometer, a reflux cooling pipe and a nitrogen inlet pipe. g, 6.51 g of itaconic acid, 1.38 g of sodium methallyl sulfonate, 23.13 g of 1% N,N'-methylenebisacrylamide, and then adjusted to pH 3.0 with 30% sulfuric acid aqueous solution. Under a nitrogen atmosphere, the temperature was raised to 60° C., ammonium persulfate was added as a polymerization initiator, and under a nitrogen atmosphere, the temperature was raised to 85° C. and kept warm. Ammonium persulfate was additionally added 1 hour after the start of the polymerization, and the polymerization was stopped 2 hours after the start of the reaction. After cooling, an additive for papermaking with a solid content of 20.1% was obtained. The obtained additive for papermaking was adjusted to a solid conte...

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Abstract

The present invention addresses the problem of providing: a polyacrylamide-based papermaking additive having an excellent paper strength-enhancing effect; paper in which the papermaking additive is used; and a paper manufacturing method in which the papermaking additive is used. A papermaking additive containing an amphoteric polyacrylamide containing, as copolymerization components, (A) (meth)acrylamide, (B) a (meth)allyl sulfonic acid, (C) an anionic vinyl monomer having a carboxyl group, and (D) a cationic vinyl monomer having a quaternary ammonium, wherein the papermaking additive is characterized in that the ratio of the anion equivalent and cation equivalent of the amphoteric polyacrylamide is 0.05 to 1.7, the octanol/water partition coefficient of the amphoteric polyacrylamide is -1.44 to -0.60, and the surface tension of the amphoteric polyacrylamide is 66 mN/m to less than 74 mN/m.

Description

technical field [0001] The present invention relates to a paper-making additive excellent in paper strength enhancing effect, paper containing the paper-making additive, and a paper manufacturing method. Background technique [0002] Conventionally, in order to improve productivity or improve paper strength, various additives for papermaking including polyacrylamide-based paper strength agents have been used in paper production. [0003] As a polyacrylamide-based paper strength agent, for example, a paper strength enhancer has been proposed, which is an aqueous solution of an acrylamide-based polymer with a low viscosity despite having a high concentration and a high molecular weight, and has specific bursting strength, Z-axis strength, etc. Excellent force strength or freeness (refer to Patent Document 1); a paper strength enhancer, containing acrylamide polymer, the acrylamide polymer is obtained by including (meth)acrylamide, quaternary ammonium monomer and (meth)allyl s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/37C08F220/56D21H21/18
CPCD21H17/37D21H21/18C08F220/56D21H17/375D21H17/58D21H17/43D21H17/63D21H17/74D21H21/06
Inventor 山本琢二信国茂树岩城直陶茨木英夫吉谷孝治
Owner SEIKO PMC CORP
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