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Water-dispersible sizing agent, method of manufacturing paper, and method of manufacturing paperboard

A manufacturing method and dispersive technology, applied in the field of paperboard manufacturing, can solve the problems of insufficient reduction of papermaking pollution, difficulty in use, poor stability of dispersant at low temperature, etc., and achieve excellent sizing effect

Inactive Publication Date: 2013-06-19
SEIKO PMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, starch-based dispersants have the following problems: the low-temperature stability of the dispersant itself is poor, and in actual use, it is difficult to use it in winter when the temperature drops
However, in these methods, it is not enough to reduce the pollution of papermaking system.

Method used

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  • Water-dispersible sizing agent, method of manufacturing paper, and method of manufacturing paperboard
  • Water-dispersible sizing agent, method of manufacturing paper, and method of manufacturing paperboard
  • Water-dispersible sizing agent, method of manufacturing paper, and method of manufacturing paperboard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0078] (Examples 1-4), Comparative Examples 1-6)

Synthetic example 1

[0080] Prepare a mixture of 275 parts by mass of an aqueous acrylamide solution having a concentration of 40% by mass, 25 parts by mass of an aqueous 40% by mass acrylic acid solution, and 595 parts by mass of water under a nitrogen atmosphere, and then add 2% by mass of ammonium persulfate to the mixture at a temperature of 50°C. 5 mass parts of aqueous solution and 5 mass parts of 2 mass % sodium bisulfite aqueous solution, spend 3 hours under 80 ℃ to make above-mentioned acrylamide and acrylic acid copolymerization reaction, add 40 mass % naphthalenesulfonic acid formaldehyde condensate sodium salt aqueous solution ( Demol-NL, Kao Corporation) 75 parts by mass, and the thus obtained mixture was diluted with water to obtain a dispersant 1 having a solid content concentration of 10 mass%.

Synthetic example 2

[0082] Except that the mixture of 275 parts by mass of acrylamide aqueous solution with a concentration of 40 mass %, 25 parts by mass of acrylic acid aqueous solution of 40 mass % and 595 parts by mass of water is replaced by an aqueous solution of acrylamide with a concentration of 40 mass % under nitrogen atmosphere 264 Parts by mass, 25 parts by mass of an aqueous 40 mass % acrylic acid solution, 11 parts by mass of an aqueous 40 mass % dimethylaminopropylacrylamide solution and 595 parts by mass of water, all the same as in Synthesis Example 1 above, to obtain a solid content concentration of 10 mass parts % of dispersant 2.

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Abstract

The purpose of the present invention is to provide a water-dispersible sizing agent that has outstanding sizing effect and can reduce soiling by the sizing agent by virtue of outstanding dispersion stability with respect to a diluent containing a loading material or the like; and to provide a method of manufacturing paper, for example, paperboard. The water-dispersible sizing agent contains a dispersant which is an alkali metal salt of a naphthalenesulfonic acid formalin condensate or an ammonium salt of a naphthalenesulfonic acid formalin condensate, and / or an alkali metal salt of ligninsulfonic acid or an ammonium salt of ligninsulfonic acid; and a substituted succinic anhydride. The ionicity of the water-dispersible sizing agent exhibits anionicity in the papermaking system. The method of manufacturing paper, and paperboard in particular, is characterized in that paper is manufactured by adding the water-dispersible sizing agent to a pulp slurry, more particularly, a pulp slurry having a pH of 6.5-8.5, an alkalinity of 50-400 ppm, and a conductivity of 50-250 mS / m.

Description

technical field [0001] The present invention relates to a water-dispersible sizing agent, a method for producing paper, and a method for producing cardboard, and more particularly, to a water-dispersible sizing agent that contains substituted succinic anhydride and is excellent in dispersion stability to diluents containing fillers and the like. A sizing agent, and a method for producing paper having an excellent sizing effect, especially cardboard. Background technique [0002] A water-dispersible sizing agent that replaces succinic anhydride (hereinafter sometimes abbreviated as ASA) is widely used in the papermaking field as a sizing agent for imparting water resistance to paper. Similarly, 2-oxetanone compound (2-oxetanone compound) (hereinafter sometimes abbreviated as AKD) represented by alkyl-ketene dimer is also used as a sizing agent, However, compared with AKD, ASA has the feature of being superior in the sizing degree after papermaking and the sizing effect o...

Claims

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Application Information

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IPC IPC(8): D21H21/16B01F17/12B01F17/22B01F17/50B01F17/52D21H17/09D21H17/16D21H17/37C09K23/12C09K23/22C09K23/50C09K23/52
CPCD21H17/07D21H17/09D21H17/23D21H17/66D21H21/16
Inventor 藤原康史饭田嗣郎
Owner SEIKO PMC CORP
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