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A method for on-site coating pre-flocculation modification of paper-making filler

A paper-making filler and coating technology, which is applied in the field of papermaking, can solve the problems of paper opacity reduction, filler pre-flocculation size and distribution are difficult to control, etc., and achieve high strength and increase ash content.

Active Publication Date: 2020-08-11
浙江杭化新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the previous on-site pre-flocculation technology of fillers, this technology solves the problem that there is no hydrogen bond between filler pre-flocculation and fibers, so the paper strength is limited, and achieves more filler content and better paper performance in paper production. , the purpose of lower comprehensive production cost of paper; at the same time, it also solves the technical problems in the prior art that the paper opacity is obviously reduced after filler pre-flocculation and the size and distribution of filler pre-flocculation are not easy to control

Method used

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  • A method for on-site coating pre-flocculation modification of paper-making filler
  • A method for on-site coating pre-flocculation modification of paper-making filler
  • A method for on-site coating pre-flocculation modification of paper-making filler

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Embodiment 1

[0039] refer to figure 1 , figure 1 It is a working principle diagram of an on-site coating pre-flocculation modification method for paper-making fillers provided by the embodiment of the present invention. Taking the modification of calcium carbonate filler as an example, the preparation method of the on-site coating pre-flocculation fillers in this embodiment include:

[0040] The first step: take liquid high concentration suspension calcium carbonate (CaCO 3 ) Filler 1, add an appropriate amount of water to dilute to a concentration of 30% suspension 50g, fully stir to obtain unmodified CaCO 3 System 2.

[0041] The second step: to the unmodified CaCO 3 Add 0.9mL of anionic polyacrylamide (APAM)3 solution with a concentration of 18.8g / L to system 2, stir well to obtain CaCO 3 / APAM System 4.

[0042] Step 3: To CaCO 3 / APAM system 4 was added with a concentration of 5.5g / L cationic starch (CSt) 5 solution 28mL, fully stirred to obtain CaCO 3 / APAM / CSt system 6.

[...

Embodiment 2

[0058] An on-site coating pre-flocculation modification method for paper-making fillers is characterized in that it comprises the following steps:

[0059] 1) Coating: First disperse the paste kaolin filler in water to form a filler suspension, then add the polyelectrolyte A solution to the filler suspension and mix for 7 minutes, then add the polyelectrolyte B solution and mix for 7 minutes to make the surface of the filler The polyelectrolyte composite with loose structure formed by polyelectrolyte A and polyelectrolyte B is coated to obtain a filler-coated body.

[0060] 2) Pre-flocculation: add polyelectrolyte C solution and mix evenly, so that filler-coated pre-flocculation with larger size is produced between filler-coated bodies.

[0061] The combination of polyelectrolytes A, B and C is anion polyacrylamide / cation chitosan / cation polyacrylamide. The usage amount of the polymer electrolyte A is 0.50wt% of the filler, the usage amount of the polymer B is 2.0wt% of the f...

Embodiment 3

[0063] An on-site coating pre-flocculation modification method for paper-making fillers is characterized in that it comprises the following steps:

[0064] 1) Coating: first disperse the talcum powder aqueous solution in water to form a filler suspension, then add the polyelectrolyte A solution to the filler suspension and mix for 3 minutes, then add the polyelectrolyte B solution and mix for 3 minutes, so that the surface of the filler is covered. Polyelectrolyte A and polyelectrolyte B formed a polyelectrolyte complex with a loose structure and coated to obtain a filler-coated body.

[0065] 2) Pre-flocculation: add polyelectrolyte C solution and mix evenly, so that filler-coated pre-flocculation with larger size is produced between filler-coated bodies.

[0066] Wherein, the combination of polyelectrolytes A, B, and C is anionic polyacrylamide / cationic guar gum / cationic polyacrylamide. The usage amount of the polymer electrolyte A is 0.25wt% of the filler, the usage amount...

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Abstract

The invention relates to the technical field of paper making, and discloses an on-site coating and pre-flocculation modification method for a paper making filler. The method comprises the following steps: dispersing the filler in water to form a filler suspension; then adding a polyelectrolyte A solution into the filler suspension, and performing uniform mixing; adding a polyelectrolyte B solution, and performing uniform mixing; and finally, adding a polyelectrolyte C solution, and performing uniform mixing, wherein in the process, the particle surface of the filler is coated by a polyelectrolyte compound which is formed by the polyelectrolyte A and the polyelectrolyte B and has a bulk structure, and then, a larger coating and pre-flocculation body is formed between filler coating bodies under the action of the polyelectrolyte C. After the coating and pre-flocculation body is added into paper pulp for paper making, paper having higher ash content can be obtained; and meanwhile, the strength of the paper is maintained furthest.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to an on-site coating pre-flocculation modification method for papermaking fillers. Background technique [0002] The main raw materials for papermaking are fibers and fillers. The process of mixing fillers into pulp fibers is called filling. Paper filling can alleviate the pressure of fiber resource shortage, effectively reduce the raw material cost of papermaking, improve the surface performance and printing effect of paper products, and increase the use value and economic value of paper products. The benefits brought by paper filling have prompted paper workers to work hard in the direction of high filling. [0003] However, with the traditional filling process, due to the lack of hydrogen bonding between the filler and the fibers, the higher the filler content in the paper, the more hindered the hydrogen bonding between the paper fibers, and the strength of the paper mainl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/14D21H17/69
CPCD21H17/69D21H21/14
Inventor 王立军陈南男姚献平田清泉黄珏
Owner 浙江杭化新材料科技有限公司