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A kind of wet end starch and application thereof

A wet end and starch technology, applied in the field of wet end chemicals for papermaking, can solve the problems of powder loss, hair loss, abrasion of printing plates, reduction of paper strength, etc., and achieve the effect of saving natural resources and ensuring environmental protection

Active Publication Date: 2016-03-30
江苏博汇纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding too much filler to paper also brings some adverse effects, mainly manifested in the reduction of paper strength and sizing effect, and the phenomenon of powder and hair loss is prone to occur during printing, and the filler particles are transferred to the printing plate and blanket There will be paste on the plate and other phenomena; due to the friction of the filler, it will also wear the printing plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of embodiment 1 modified starch

[0030] 100 parts by mass of cationic tapioca starch (Huantai County Jinhu Modified Starch Factory, MTH-3 type), dissolved in 180 parts of water, stirred at a temperature of 100°C for 30 minutes to obtain a translucent pasty liquid; polyvinyl alcohol (EG-40) is dissolved in water at 70°C to make an aqueous solution with a mass concentration of 15%; starch solution and plasticizer solution are mixed to obtain wet starch solution, and the mass ratio of starch and plasticizer is 100:3 (dry material meter). When adding to the wet end system, calculate the addition amount based on the dry matter of starch.

Embodiment 2

[0031] The preparation of embodiment 2 modified starches

[0032] 100 parts by mass of amphoteric tapioca starch (Huantai County Kumho Modified Starch Factory, MTH-1 type), dissolved in 180 parts of water, stirred at a temperature of 100°C for 30 minutes to obtain a translucent pasty liquid; CaCl 2 5 parts and 10 parts of water-based polyurethane (Zhejiang Lingxin Polyurethane Co., Ltd.) are dissolved in 85 parts of water at room temperature to make an aqueous solution with a mass concentration of 15%; starch solution and plasticizer solution are mixed to obtain wet part starch solution, starch and plasticizer The mass ratio is 100:15 (dry matter basis, starch mass: CaCl 2 + water-based polyurethane). When adding to the wet end system, calculate the addition amount based on the dry matter of starch.

Embodiment 3

[0034] The proportion of pulp is 10% of softwood pulp (NBKP, purchased from Jinguang APP Group, which belongs to bleached chemical pulp, NBKP refers to long fiber), Canadian freeness 400±20mL, and 90% of hardwood pulp (LBKP, purchased from Jinguang APP Group, It belongs to bleached chemical staple fiber), and the Canadian freeness control is 420±20ml.

[0035] Pulping: Scatter and refine the raw materials in proportion. Add wet-end chemicals: 10 kg / t of alkyl ketene dimer, 250 kg / t of talcum powder, 10 kg / t of wet-end starch prepared in Example 2, and 0.2 kg / t of polyacrylamide. Surface sizing: use cassava oxidized starch as the surface sizing starch, and the dosage is 25kg / t. It is then dried and rolled into paper to make paper.

[0036] The base paper has a paper weight of 100gsm and an ash content of 25%. Smoothness: 47 sec / 10ml,

[0037] Folding resistance MD / CD31 times / 30 times, Cobb60: 21 grams / square meter.

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PUM

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Abstract

The invention provides novel wet-end starch. Starch is modified by plasticization and then is applied to a wet end so as to solve the problem of reduction of folding strength caused by the increasing of ash content or the increasing of the usage amount of mechanical pulp in a papermaking process, or the slurry and ash content conditions are maintained so as to ensure the higher folding strength of paper. The invention also provides application of the novel wet-end starch. The novel wet-end starch provided by the invention is cationic or amphoteric. When the novel wet-end starch is used for papermaking, the quality of paper is improved, or the usage amount of chemical fibers is reduced while the quality of paper is maintained. The folding strength of paper made by the novel wet-end starch can be improved by 50% when other papermaking conditions are kept unchanged, or the folding strength of paper is kept unchanged while the ash content increases by 5% or the usage amount of mechanical pulp increases by 10%.

Description

technical field [0001] The invention belongs to the field of pulp mixture, in particular to a starch-containing wet-end chemical for papermaking. Background technique [0002] At present, with the increasingly serious competition and the shortage of wood fiber, the content of ash and mechanical pulp in paper is increasing day by day, and the physical properties of paper are reduced, especially in the performance of folding endurance index. In order to make up for the loss of strength, usually in paper In the process of copying, a large amount of starch will be added or the amount of NBKP will be increased. The former has the problem of excessive starch usage and low retention rate, while the latter will significantly increase the production cost. [0003] In order to ensure the high folding resistance of the paper, the pulp of the base paper should have a higher amount of long fibers, that is to say, the long fiber bleached chemical pulp should be used as the pulp. In the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/28C08L3/02
Inventor 张家李陈汉彬李娟
Owner 江苏博汇纸业有限公司