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Papermaking raw material prepared from modified calcium sulfate whiskers and application

A technology of calcium sulfate whiskers and calcium sulfate, which is applied in the field of papermaking, can solve the problems of the amount of addition, the processing method, the defective papermaking process, the low retention rate, and the wrong concept, so as to meet the tensile strength and other performance requirements , The effect of improving the retention rate

Inactive Publication Date: 2017-02-01
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems in the application of modified calcium sulfate whiskers in papermaking: (1) conceptual errors: many researchers believe that modified calcium sulfate whiskers are fillers, which are no different from the talcum powder and calcium powder added in traditional papermaking
Because the price of whiskers is much higher than that of calcium powder and talcum powder, whiskers paper has lost its market advantage and has not been used in production.
(2) Applied technology research cannot meet the needs of production
The application of modified calcium sulfate whiskers in papermaking in the prior art is to imitate the addition of fillers. The amount of addition, treatment method and papermaking process are defective, and the dissolution of calcium sulfate whiskers and the surface chemistry of whisker fibers are not fully considered. Effect of properties on papermaking
Ultimately, it leads to problems such as low retention rate and low tensile strength index of paper

Method used

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  • Papermaking raw material prepared from modified calcium sulfate whiskers and application
  • Papermaking raw material prepared from modified calcium sulfate whiskers and application
  • Papermaking raw material prepared from modified calcium sulfate whiskers and application

Examples

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preparation example Construction

[0042] Preparation of modified calcium sulfate whiskers:

[0043] According to the modification method of the present invention, the calcium sulfate whisker raw material is modified, and the specific modification process is: the raw material calcium sulfate whisker is dispersed in water added with a modifying agent, and the calcium sulfate crystal is filtered after fully stirring at a certain temperature. The whiskers were separated from water to obtain modified calcium sulfate whiskers; wherein, the mass ratio of water to calcium sulfate whiskers was 10:1, the temperature was 85° C., and the stirring time was 40 minutes.

[0044] Wherein, modifier composition and dosage are as shown in Table 1 below:

[0045] Table 1 Modifier composition and dosage

[0046]

[0047]

[0048] Modified calcium sulfate whiskers are being produced 13g / m 2 Applications in the tissue industry

Embodiment 1

[0050] Present embodiment papermaking process is as follows:

[0051] 1) After gelatinizing the cationic starch at 85°C for 30 minutes, mix it with the cationic guar gum solution for later use;

[0052] 2) Mix the auxiliary agent and cationic polyacrylamide solution for later use;

[0053] 3) The modified calcium sulfate whiskers prepared by the above formula 1, the cationic starch after gelatinization and the mixed solution of cationic guar gum, the mixed solution of quaternary ammonium salt auxiliary agent and cationic polyacrylamide are sequentially added to the wood (bamboo) ) slurry in the white water tank, and fully stirred, adding polyoxyethylene;

[0054] 4) Squeeze the mixed slurry in the white water tank into the network tank through the pulping pump, and obtain the product paper through pressing and drying processes;

[0055] 5) The white water in the mesh tank flows back to the white water tank for reuse.

[0056] The consumption of raw materials and each auxili...

Embodiment 2

[0069] Present embodiment papermaking process is as follows:

[0070] 1) After gelatinizing the cationic starch at 75°C for 35 minutes, mix it with the cationic guar gum solution for later use;

[0071] 2) Mix the auxiliary agent and cationic polyacrylamide solution for later use;

[0072] 3) The modified calcium sulfate whiskers prepared by the above formula 1, the cationic starch after gelatinization and the mixed solution of cationic guar gum, the mixed solution of quaternary ammonium salt auxiliary agent and cationic polyacrylamide are sequentially added to the wood (bamboo) ) slurry in the white water tank, and fully stirred, adding polyoxyethylene;

[0073] 4) Squeeze the mixed slurry in the white water tank into the network tank through the pulping pump, and obtain the product paper through pressing and drying processes;

[0074] 5) The white water in the mesh tank flows back to the white water tank for reuse.

[0075] The consumption of raw materials and each auxili...

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Abstract

The invention relates to a papermaking raw material prepared from modified calcium sulfate whiskers, and belongs to the technical field of papermaking. The modified calcium sulfate whiskers are adopted to replace 20%-35% of wood (bamboo) pulp of the raw material. The modified calcium sulfate whiskers are obtained through the steps that calcium sulfate whisker raw materials are dispersed into water added with a modifying agent, the mixture is fully stirred at certain temperature, and then filtering is conducted. The invention further relates to application of the modified calcium sulfate whiskers in papermaking. According to the papermaking raw material, by modifying the calcium sulfate whiskers, the retention rate of the whiskers can be significantly increased, and the strength of paper is enhanced; part of wood (bamboo) pulp is replaced with the modified calcium sulfate whiskers, therefore, the using amount of the papermaking raw material-wood (bamboo) pulp is decreased, and the purposes of reducing the production cost and achieving environmental friendliness are achieved. Dissolution of modified calcium sulfate and interaction between the whiskers and chemical bonds the plant fiber surfaces are fully taken into account by the papermaking raw material technology and the auxiliary using amount, and therefore the retention rate and the strength of the paper are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of papermaking, in particular to a papermaking raw material and a process, in particular to a modified calcium sulfate whisker papermaking raw material and its application. Background technique [0002] Calcium sulfate whisker, alias: gypsum whisker, gypsum fiber. Using gypsum as the raw material, it is a fibrous (whisker-like) single crystal that grows in the form of a single crystal through artificial control, with a uniform cross-section, a complete shape, and a perfect internal structure. It has a certain length-to-diameter ratio, good tensile strength and modulus, small bulk density, and calcium sulfate whiskers have dihydrate (CaSO 4 2H 2 O), semi-water (CaSO 4 0.5H 2 O), anhydrous soluble and anhydrous dead burnt (CaSO 4 ) points. The preparation methods mainly include hydrothermal method and atmospheric pressure acidification method. [0003] Calcium sulfate whiskers are slightly soluble in wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H15/12D21H13/36D21H17/55D21H17/29D21H17/32D21H17/53D21H17/07
CPCD21H13/36D21H15/12D21H17/07D21H17/29D21H17/32D21H17/53D21H17/55D21H17/74
Inventor 桂明生赵小兵王鹏飞
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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