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On-site coating and pre-flocculation modification method for 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: 2018-02-09
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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  • On-site coating and pre-flocculation modification method for paper making filler

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Embodiment 1

[0039] see figure 1 , figure 1 This is the working principle diagram of a method for on-site coating and pre-flocculation modification of papermaking filler provided by the embodiment of the present invention. Taking the modification of calcium carbonate filler as an example, the preparation method of on-site coating and pre-flocculation filler in this embodiment is shown. include:

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

[0041] The second step: to the unmodified CaCO 3 Add 0.9 mL of anionic polyacrylamide (APAM) 3 solution with a concentration of 18.8 g / L to system 2, and stir well to obtain CaCO 3 / APAM system4.

[0042] Step 3: To CaCO 3 Add 28 mL of cationic starch (CSt) 5 solution with a concentration of 5.5 g / L to the APAM system 4, and stir well to ob...

Embodiment 2

[0058] A method for on-site coating and pre-flocculation modification of papermaking filler is characterized by comprising 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, and then add the polyelectrolyte B solution and mix for 7 minutes to make the filler surface It is coated with a loosely structured polyelectrolyte composite formed by polyelectrolyte A and polyelectrolyte B to obtain a filler-coated body.

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

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

Embodiment 3

[0063] A method for on-site coating and pre-flocculation modification of papermaking filler is characterized by comprising the following steps:

[0064] 1) Coating: First disperse the talc aqueous solution in water to form a filler suspension, then add the polyelectrolyte A solution to the filler suspension and mix for 3 minutes, and then add the polyelectrolyte B solution and mix for 3 minutes, so that the surface of the filler is coated. The polyelectrolyte composite with loose structure formed by polyelectrolyte A and polyelectrolyte B is coated to obtain a filler coated body.

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

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

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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 a method for on-site coating and preflocculation modification of 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 relieve the pressure of shortage of fiber resources, effectively reduce the cost of raw materials for papermaking, improve the surface properties and printing effects of paper products, and increase the use value and economic value of paper products. The benefits of paper filling have prompted papermakers to work towards high filling. [0003] However, with the traditional filling process, due to the lack of hydrogen bonding between the filler and the fiber, the higher the filler content in the paper, the greater the hindrance to the hydrogen bonding between the paper fibers, and the strength of the paper mainly dep...

Claims

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Application Information

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Patent Type & Authority Applications(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
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