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A paper-making filling method based on in-situ growth of gel-coated MOFs

An in-situ growth and gel technology, which is applied in the field of paper filling, can solve the problems of impact, little increase in the retention rate of retention aids and fillers, and poor results.

Active Publication Date: 2021-11-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to improve filler retention, but in some cases traditional methods are not effective
For example, studies have shown that introducing functional components MOFs into paper, retention aids have little effect on filler retention, and the papermaking process will affect MOFs and lose their functionality

Method used

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  • A paper-making filling method based on in-situ growth of gel-coated MOFs
  • A paper-making filling method based on in-situ growth of gel-coated MOFs
  • A paper-making filling method based on in-situ growth of gel-coated MOFs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Prepare chitosan-metal ion solution: take 0.1g chitosan powder, fully disperse in 99.9mL deionized water, obtain chitosan powder suspension; add 2mL glacial acetic acid, stir and dissolve to obtain chitosan solution; add 0.9g zinc nitrate hexahydrate again, stir and dissolve fully, obtain chitosan-zinc ion precursor solution;

[0039] (2) Prepare chitosan-metal ion-ligand gel: prepare (5.0%) sodium hydroxide and 2-methylimidazole (5%) composite coagulation bath, under 1000r / min stirring effect, to sodium hydroxide Add the chitosan-zinc ion precursor solution dropwise to the 2-methylimidazole composite coagulation bath until the chitosan completely forms a gel to obtain the chitosan-metal ion-ligand composite flocculent gel suspension;

[0040] (3) Preparation of chitosan-ZIF-8 composite gel particles: the chitosan-metal ion-ligand composite flocculent gel suspension obtained in the collection step (2) is transferred to a polytetrafluoroethylene reactor. At room tem...

Embodiment 2

[0043] (1) Prepare chitosan-metal ion solution: weigh 0.2g chitosan powder, fully disperse in 99.8mL deionized water to obtain chitosan powder suspension; add 2mL glacial acetic acid, stir and dissolve to obtain chitosan solution; add 1.2g zinc nitrate hexahydrate again, stir and dissolve fully, obtain chitosan-zinc ion precursor solution;

[0044] (2) Prepare chitosan-metal ion-ligand gel: prepare (8.0%) sodium hydroxide and 2-methylimidazole (5.0%) composite coagulation bath, under 1000r / min stirring effect, to sodium hydroxide Add the chitosan-zinc ion precursor solution dropwise to the 2-methylimidazole composite coagulation bath until the chitosan completely forms a gel to obtain the chitosan-metal ion-ligand composite flocculent gel suspension;

[0045] (3) Preparation of chitosan-ZIF-8 composite gel particles: the chitosan-metal ion-ligand composite flocculent gel suspension obtained in the collection step (2) is transferred to a polytetrafluoroethylene reactor. At 40°...

Embodiment 3

[0048] (1) Prepare chitosan-metal ion solution: weigh 0.2g chitosan powder, fully disperse in 99.8mL deionized water to obtain chitosan powder suspension; add 2mL glacial acetic acid, stir and dissolve to obtain chitosan solution; add 0.8g zinc nitrate hexahydrate again, stir and dissolve fully, obtain chitosan-zinc ion precursor solution;

[0049] (2) Prepare chitosan-metal ion-ligand gel: prepare (10.0%) sodium hydroxide and 2-methylimidazole (5.0%) composite coagulation bath, under 1000r / min stirring effect, to sodium hydroxide Add the chitosan-zinc ion precursor solution dropwise to the 2-methylimidazole composite coagulation bath until the chitosan completely forms a gel to obtain the chitosan-metal ion-ligand composite flocculent gel suspension;

[0050] (3 prepare chitosan-ZIF-8 composite gel particles: the chitosan-metal ion-ligand composite flocculent gel suspension that collection step (2) obtains is transferred in polytetrafluoroethylene reactor, at 60 Under the te...

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Abstract

The invention discloses a paper-making filling method based on in-situ growth of gel to coat MOFs filler. The MOFs obtained by the invention have uniform particle size and distribution, and are well combined with chitosan gel. Moreover, the natural polymer chitosan has good compatibility with cellulose, which can not only carry the MOFs filler generated in situ into the paper, so as to realize the efficient retention of functional fillers; it can also improve the affinity between the filler and the paper, and improve the strength of the paper ; While endowing paper with functionality, it improves the negative impact of filling on papermaking.

Description

technical field [0001] The invention belongs to the field of papermaking filling, and in particular relates to a papermaking filling method based on gel in-situ growth-coated MOFs. Background technique [0002] Fillers have become one of the indispensable and important components in modern papermaking, which can reduce costs, improve smoothness, optical performance, writing adaptability, etc., and can also bring specific functions to paper by adding fillers to promote the development of functional paper products; [0003] Due to the control of raw materials and costs of paper production and the development of paper functionality, the research on filler retention has important practical significance and has aroused widespread interest in the paper industry. Various methods have been developed to improve filler retention, but in some cases traditional methods are not effective. For example, studies have shown that introducing functional components MOFs into paper, retention a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/24D21H17/46C08G83/00
CPCC08G83/008D21H17/24D21H17/46
Inventor 聂景怡解宏滨梁建涛
Owner SHAANXI UNIV OF SCI & TECH
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