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Retention aid and method for producing paper using same

A manufacturing method and technology of retention aids, applied in the direction of addition of retention aids, papermaking, paper, etc., can solve the problems of reducing the uniformity of paper thickness, complicated operability of paper machines, and increasing the total addition amount

Active Publication Date: 2019-03-19
SOMAR CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In these methods, by combining two or more types of retention aids with different ionic properties, the flocs can be re-coagulated to form flocs even if they are once collapsed. The formation of larger flocs will reduce the uniformity of paper thickness (hereinafter referred to as texture and physical properties), and there is a disadvantage that the operability of the paper machine becomes complicated.

Method used

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  • Retention aid and method for producing paper using same
  • Retention aid and method for producing paper using same
  • Retention aid and method for producing paper using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0065] (Examples 1-3, Comparative Examples 1-3 and Conventional Examples 1-3)

[0066] Retention aids were prepared using cationic and anionic polymer compounds shown in Tables 1 to 9 below. In addition, the cationic and anionic polymer compounds used in each of the Examples, Comparative Examples, and Conventional Examples are as follows.

[0067] Cationic polymer compound A: acrylamide-acryloyloxyethyltrimethylammonium chloride copolymer (linear structure)

[0068] Cationic polymer compound B: acrylamide-acryloyloxyethyltrimethylammonium chloride copolymer (branched chain structure)

[0069] Anionic polymer compound A: acrylamide-sodium acrylate copolymer (linear structure)

[0070] Anionic polymer compound B: acrylamide-sodium acrylate copolymer (branched chain structure)

[0071] [Measurement of viscosity average molecular weight]

[0072] The viscosity-average molecular weight of the polymer compound was obtained by measuring the intrinsic viscosity according to the in...

Embodiment 4 and comparative example 4

[0151] Under the conditions identical with embodiment 1-10, 1-12, 2-9, 2-12 and 3-5 and comparative example 1-11, 1-12 and 2-9, to paper machine (coating base paper Equipment, papermaking speed: 1300m / min) performed a retention aid addition test based on actual equipment. In the actual equipment, aluminum sulfate is added before the seed box, alkyl ketene dimerization system sizing agent (AKD) is added in the seed box, and cationic polyacrylamide paper strength agent is added after the seed box. Calcium carbonate as a filler is added before the slurry pump, and retention aids are added before the screen, after the screen or before and after the screen. The obtained results are shown in Table 10.

[0152] [Table 10]

[0153]

[0154] It can be seen from Table 10 that the retention aid addition test based on the Brit type dynamic water drainage tester has the same result as the retention aid addition test based on the actual equipment.

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Abstract

Provided are a retention aid and a method for producing paper by using the same which make it possible to produce paper having a high filler content and having the filler uniformly dispersed therein, without sacrificing paper-production-step operability or paper formation properties, regardless of paper type. This method involves adding the following retention aid to a pulp-containing aqueous slurry before and / or after passage through a screen: a retention aid containing a cationic or anionic polymer compound having a viscosity-average molecular weight of over 35,000,000, wherein the cationic or anionic charge density in the cationic or anionic polymer compound is 0.6-4.0 meq / g.

Description

technical field [0001] The present invention relates to a retention aid capable of producing a large amount of paper containing and uniformly dispersed waste paper and fillers regardless of the type of paper without impairing the workability in the papermaking process and the texture and physical properties of paper, and the production of paper using the same method Background technique [0002] In recent years, due to environmental problems such as global warming and efficient use of resources, pulp made from recycled waste paper has been used in large quantities. As paper to be recycled, for example, in addition to newspapers, magazines, carbon paper, corrugated cardboard, etc., shredded paper called shredder dust from offices and the like is increasing recently. [0003] In general, since recycled pulp has a shorter pulp fiber length than virgin pulp, a retention aid is usually used in order to increase the total retention rate when using recycled pulp to make paper. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/10D21H17/41D21H23/14
CPCD21H17/41D21H21/10D21H23/14
Inventor 但木孝一大石浩之春日一孝望月裕太藤田幸裕
Owner SOMAR CORP
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