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Polyacrylamide-based surface paper strength agent and method for producing paper

A polyacrylamide-based, paper strength agent technology, applied in paper, papermaking, paper coating and other directions, can solve problems such as unsatisfactory, and achieve excellent paper strength enhancement effect

Inactive Publication Date: 2017-05-03
SEIKO PMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, these inventions are still insufficient as a method for improving the strength of paper. In particular, the effect of improving the strength of paper that requires high strength due to the thinning of cardboard that has been rapidly promoted in recent years cannot be fully realized. satisfy

Method used

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  • Polyacrylamide-based surface paper strength agent and method for producing paper
  • Polyacrylamide-based surface paper strength agent and method for producing paper
  • Polyacrylamide-based surface paper strength agent and method for producing paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 223.8 g of water to a 1L four-necked flask equipped with a stirrer, thermometer, reflux condenser, and nitrogen conduit, and also add 111.4 g of 50% acrylamide aqueous solution, 8.5 g of itaconic acid, and methacrylic acid as monomers (1). Sodium (sodiummethylylsulfonate) 1.57g, pH was confirmed to be 2.7. Next, the temperature was raised to 70°C under a nitrogen atmosphere, 0.12 g of ammonium persulfate was added as a polymerization initiator to start polymerization, and the reaction temperature was raised to 90°C. Thereafter, 97.20 g of water, 334.2 g of 50% acrylamide aqueous solution, 8.5 g of itaconic acid, and 3.39 g of sodium methacrylate sodium sulfonate (2) were added, and ammonium persulfate was also added as a polymerization initiator. 0.40 g and 163.5 g of water were added when the estimated viscosity was 4500 mPa·s at 25°C. The pH was adjusted to 6.5 with 25% sodium hydroxide to obtain a polyacrylamide-based surface paper strength agent with a solid co...

Embodiment 2～12、 comparative example 1～5

[0056] Except that the compositions of the monomers (1) and the monomers (2) were changed as shown in Table 1, a polyacrylamide-based surface paper strength agent was obtained in the same manner as in Example 1. In addition, the usage-amount of the other monomer shown in Table 1, sodium methacryl sulfonate (SMAS) is the usage-amount with respect to the total 100 mol% of acrylamide (AAm) and anionic vinyl monomer. As in Example 1, the pH of the obtained polyacrylamide-based surface paper strength agent was adjusted to 6.5, and the solid content concentration and viscosity (25° C.) were measured.

[0057] In addition, as in Example 1, these polyacrylamide-based surface paper strength agents were adjusted to a solid content concentration of 20% and a temperature of 25°C, and the A value was obtained. Table 2 shows the results.

[0058] [Table 1]

[0059]

[0060] The meanings of the symbols in Table 1 are as follows:

[0061] AAm: acrylamide

[0062] DM: Dimethylaminoethyl...

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Abstract

An object of the present invention is to provide a polyacrylamide-based surface paper strength agent having excellent paper strength enhancement effect, and a paper manufacturing method capable of providing paper with excellent paper strength. The polyacrylamide-based surface paper strength agent is characterized in that the viscosity at 12, 30 and 60 rpm of rotation is measured by a Brookfield viscometer (solid content concentration 20 mass %, temperature 25°C), and the viscosity at 12 rpm is set as an index 100, calculate the indices corresponding to the viscosity at 30 rpm and 60 rpm, respectively. When the above index is Y and the above number of revolutions is X, the A value in the obtained logarithmic approximation formula (Y=A×lnX+B) is ‑2 to ‑10.

Description

technical field [0001] The invention relates to a polyacrylamide-based surface paper strength agent and a paper manufacturing method. More specifically, it relates to a polyacrylamide-based surface paper-strengthening agent excellent in a paper-strengthening effect, and a method for producing paper using the polyacrylamide-based surface paper-strengthening agent. Background technique [0002] Conventionally, in the papermaking process, various additives have been used in order to improve productivity and paper quality as the speed of the paper machine increases. However, in recent years, in the context of increasing the recycling rate of used paper, more and more types of used paper are mixed, and it has become difficult to obtain satisfactory paper strength only by adding internal additives. [0003] For this reason, someone has proposed the method that utilizes surface paper strength agent to make up for paper strength. For example, as a method for improving the surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/18C08F2/38C08F216/08C08F220/06C08F220/56D21H17/37D21H19/20
CPCC08F4/40C08F220/56C09D133/26D21H17/37D21H17/375D21H19/20D21H21/18C08F222/02C08F228/02C08F220/34C08F226/04
Inventor 信国茂树茨木英夫铃木洋
Owner SEIKO PMC CORP
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