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New technique for improving paper strength by joint gelatinization of starch and pulp

A process and slurry technology, which is applied in paper, special paper, textiles and papermaking, etc., can solve the problems of affecting the retention effect of additives, high cost of dry strength agent, and increased cost, so as to achieve tight fiber wrapping, low cost, The effect of less pollution

Inactive Publication Date: 2014-06-18
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (2) The cost of the existing dry strength agent is relatively high, such as cationic starch and cationic polyacrylamide, the cost is relatively high. If raw starch, oxidized starch and other relatively cheap materials can be used as the dry strength agent, the cost can be greatly saved
[0005] (3) The limitation of the retention rate when the starch is used in a high amount
[0006] (4) Limitations of starch-enhanced paper strength
[0007] (5) Existing dry strength agents such as polyacrylamide (PAM), cationic starch, anionic starch, and amphoteric starch are easily affected by the system
The principle of the traditional method of dry strength agent reinforced paper is to use the ionic characteristics of the chemical itself to adsorb the fiber, which is greatly disturbed by the system, and the anion garbage affects the retention effect of the additive, and the charged ions in the system attract each other. It is easy to form flocculation, so the efficiency of the dry strength agent is affected to a certain extent. To eliminate these effects, it is necessary to increase the cost

Method used

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  • New technique for improving paper strength by joint gelatinization of starch and pulp
  • New technique for improving paper strength by joint gelatinization of starch and pulp
  • New technique for improving paper strength by joint gelatinization of starch and pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 10g dry mechanical pulp, use oxidized starch, the amount of starch is calculated based on the dry weight of the pulp, the concentration of the pulp is heated to 15%, the temperature is 100°C, and the time is 60min. After heated and gelatinized, it is extruded and concentrated, and the slurry concentration reaches 43%. The specific enhancement effect and starch loss are shown in the table below:

[0053] Quantitative g / m 2 Amount of starch added % Starch loss rate % Fracture length Km increase % mechanical pulp blank 62.1 ------ ------ 1.78 ------ Mechanical pulp treatment sample 63.7 1.8 18.2 3.43 93 Mechanical pulp treatment sample 64.2 4.3 9.4 3.62 103

Embodiment 2

[0055] According to the ratio of 10% coniferous pulp, 10% mechanical pulp, and 80% broad-leaf pulp, the dry-dried slurry is 10g, and oxidized starch is used. The amount of starch is calculated based on the dry mass of the slurry. The concentration of the heated slurry is 15%. at 100°C for 60 minutes. After heated and gelatinized, it is extruded and concentrated, and the slurry concentration reaches 38%. The specific enhancement effect and starch loss are shown in the table below:

[0056] Quantitative g / m 2 Amount of starch added % Starch loss rate % Fracture length Km increase % mixed pulp blank 66.3 ------ ------ 2.42 ------- Mixed slurry treatment sample 67.4 1.7 19.1 3.92 62

Embodiment 3

[0059] Waste paper pulp fiber dry 20g, the amount of oxidized starch 0%, 5%, 10%, 15%, 20%, 25%, squeeze concentrated to a slurry concentration of 38%, and heat at 100 ° C for 30 min to gelatinize. See the table below for enhancements:

[0060] Starch dosage % Starch loss rate % Fracture length km increase % 0 0 1.857 ------ 5 6.0 2.403 29.40 10 11.5 2.838 52.83 15 9.7 3.361 80.99 20 18.0 3.022 62.74 25 23.2 3.075 65.59

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Abstract

The invention belongs to the technical field of paper strengthening, in particular to a method using starch as a paper dry strengthen agent. The method comprises the following steps: uniformly mixing starch accounting for 0.5-25% of oven dry mass of pulp with pulp, carrying out extrusion and concentration, heating for 8-150min at 70-100 DEG C to gelatinize starch, carrying out defibering and dispersion on the heated pulp, and manufacturing paper with pulp. The invention has simple process, low production cost and less pollution, improves the strength of paper by 30-110%, has above 80% of starch retention ratio, and can improve the retention ratios of fillers and fiber fines.

Description

technical field [0001] The invention relates to a process method for papermaking reinforcement, and belongs to the technical field of pulping and papermaking technology. Background technique [0002] The traditional methods of paper strengthening are physical methods of beating or chemical methods of adding strengthening additives. Considering the deficiency of beating to improve the strength, various dry strength agents are usually used to improve the strength of paper. A class of fine chemicals used to enhance the dry strength of paper and board is called dry strength agents. There are four main types of dry strength agents: (1) Synthetic polymers. Such as polyacrylamide, polyvinyl alcohol, urea-formaldehyde resin and melamine resin. (2) Modified starch. Such as cationic starch, anionic starch, amphoteric starch, nonionic starch, etc. (3) Cellulose, chitin derivatives and plant gums. Such as carboxymethyl cellulose, chitin, chitosan and so on. (4) Resin barrier cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/00D21H23/04D21C3/22D21C9/18D21H17/28D21H17/67
Inventor 周小凡
Owner NANJING FORESTRY UNIV