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Method for manufacturing paper board

A manufacturing method and paperboard technology, applied in the field of paperboard manufacturing, can solve the problems of unable to obtain dispersion liquid, weak sizing display, unable to obtain sizing effect, etc.

Active Publication Date: 2012-10-17
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a copolymer of (meth)acrylamide and diallylamine or its salt is used as a dispersant, there is a problem that a stable dispersion cannot be obtained.
In addition, for the AKD type sizing agent, when it contains waste paper and contains more than a certain amount of aluminum components, or in the case of cardboard without adding calcium carbonate to promote sizing display, its sizing shows There is a problem that the desired sizing effect cannot be obtained immediately after papermaking even if epichlorohydrin-modified polyamidoamine is used, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] Hereinafter, although this invention is concretely demonstrated based on an Example, this invention is not limited to these Examples. In addition, "part" and "%" in an Example and a comparative example are a mass standard unless otherwise indicated.

Synthetic example 1

[0041] Synthesis example 1 (production of diallylamine / acrylamide copolymer)

[0042] After dropping 1330.0 parts of ion-exchanged water and 19.4 parts (0.2 moles) of diallylamine into a reaction device equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen inlet pipe, and a dropping funnel, the pH was adjusted to 7. After blowing nitrogen gas to remove oxygen in the reaction system, it was heated to 70° C., and 3.5 parts of ion-exchanged water and ammonium persulfate were added. Next, 540.4 parts (3.8 mol) of 50% acrylamide aqueous solution was added at 70 degreeC over 2 hours, and it heat-retained at 70 degreeC for 2 hours. After the polymerization, ion-exchanged water was added to obtain an acrylamide copolymer (A) with a non-volatile content of 15.5%, a pH of 3.7, and a viscosity (25° C.) of 2500 mPa·s.

Synthetic example 2～5

[0043] Synthesis Examples 2-5 and Comparative Synthesis Example 1

[0044] The polymer (A) was obtained by the method similar to the synthesis example 1 except having changed the kind and usage ratio of each component in synthesis example 1 as described in Table 1. In addition, when using acrylic acid and itaconic acid together, after adding these to 50% acrylamide aqueous solution, adding 10% sodium hydroxide aqueous solution, and using it after adjusting pH to 7. The results are shown in Table 1.

[0045] Table 1

[0046]

[0047] *In the table, AM means acrylamide, DAA means diallylamine, AA means acrylic acid, ITA means itaconic acid, and DADMAC means N,N-diallyldimethylammonium chloride.

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Abstract

The present invention provides a method for manufacturing a paper board, wherein the paperboard is provided with an excellent sizing property and an excellent showing performance even if under a condition of using a paper pulp containing a lot of aluminium component or a condition of not adding calcium carbonate. The method for manufacturing a paper board comprises the steps of using a polymerized component at least containing (methyl) acrylamide (a1) and diallyl amine or salt thereof to obtain (methyl) acrylamide copolymer and ketene dipolymer sizing agent (B), and manufacturing papers with a base material paper pulp containing waste paper pulp and aluminium atoms converted for more than one wt.% from 16 aluminum sulfate hydrate relative to the drying weight of the base material paper pulp under a PH value of 6-8.

Description

technical field [0001] The present invention relates to a method for the manufacture of paperboard. Background technique [0002] As neutral sizing agents for papermaking, rosin-based sizing agents, alkenyl succinic anhydride-based sizing agents (hereinafter, sometimes referred to as ASA-based sizing agents), and alkyl or alkenyl ketene dimer-based sizing agents are generally used. (sometimes called the AKD class). In particular, neutral rosin sizing agents are commonly used in paperboard. The ASA-based sizing agent contaminates papermaking equipment and has a serious problem in terms of workability. In addition, there is a problem that the AKD type sizing agent does not show the desired sizing effect immediately after paper making (the so-called sizing effect is slow to develop). But, in recent years, following method has been proposed: still use ASA type sizing agent and AKD type sizing agent in the manufacture of cardboard, especially do not add or add very small amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H17/55D21H17/17
Inventor 横谷贤治荣村拓史大塚洋平相野谷卓
Owner ARAKAWA CHEM IND LTD
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