Method of preparing papermaking enhancer from waste paper

A papermaking enhancer and waste paper technology, applied in the field of papermaking, can solve the problem of low physical properties of paper, and achieve the effects of increasing the binding force and improving the tensile index

Inactive Publication Date: 2018-10-02
JURONG MAOYUAN WEAVING FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the improvement of people's living standards, the quality requirements for paper are getting higher and higher, but many raw materials in papermaking come from secondary fibers, resulting in poor physical properties of the manufactured paper
At the same time, people pay more and more attention to the protection of the enviro

Method used

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  • Method of preparing papermaking enhancer from waste paper

Examples

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Embodiment 1

[0018] A method for preparing a paper-making reinforcing agent from waste paper, comprising the following steps:

[0019] Step 1, cutting the waste paper into small pieces, adding the pieces to the deinking aid, stirring and pulping, heat preservation and curing, to obtain deinked pulp;

[0020] Step 2: Add concentrated sulfuric acid dropwise to the deinked pulp, stir while adding, heat-preserve and seal at 45°C for 30 minutes, add deionized water to terminate the reaction, obtain a reaction solution, centrifuge the reaction solution, wash the precipitate with deionized water until the pH is Neutral to obtain nanocellulose;

[0021] Step 3, adding nanocellulose to dimethyl sulfoxide, adding sodium hydroxide under stirring conditions, heating to 60°C, adding 2,3-epoxypropyltrimethylammonium chloride dropwise, and keeping the temperature for 5 hours, Pour the reaction solution into ethanol to terminate the reaction, centrifuge the reaction solution, wash with ethanol, and dry t...

Embodiment 2

[0029] A method for preparing a paper-making reinforcing agent from waste paper, comprising the following steps:

[0030] Step 1, cutting the waste paper into small pieces, adding the pieces to the deinking aid, stirring and pulping, heat preservation and curing, to obtain deinked pulp;

[0031] Step 2: Add concentrated sulfuric acid dropwise to the deinked pulp, stir while adding, heat-preserve and seal at 55°C for 30 minutes, add deionized water to terminate the reaction, obtain a reaction solution, centrifuge the reaction solution, wash the precipitate with deionized water until the pH is Neutral to obtain nanocellulose;

[0032] Step 3, adding nanocellulose to dimethyl sulfoxide, adding sodium hydroxide under stirring conditions, heating to 65°C, adding 2,3-epoxypropyltrimethylammonium chloride dropwise, and keeping the temperature for 4 hours. Pour the reaction solution into ethanol to terminate the reaction, centrifuge the reaction solution, wash with ethanol, and dry t...

Embodiment 3

[0040] A method for preparing a paper-making reinforcing agent from waste paper, comprising the following steps:

[0041] Step 1, cutting the waste paper into small pieces, adding the pieces to the deinking aid, stirring and pulping, heat preservation and curing, to obtain deinked pulp;

[0042] Step 2: Add concentrated sulfuric acid dropwise to the deinked pulp, stir while adding, heat-preserve and seal at 70°C for 30 minutes, add deionized water to terminate the reaction, obtain a reaction solution, centrifuge the reaction solution, wash the precipitate with deionized water until the pH is Neutral to obtain nanocellulose;

[0043] Step 3, adding nanocellulose to dimethyl sulfoxide, adding sodium hydroxide under stirring conditions, heating to 70°C, adding 2,3-epoxypropyltrimethylammonium chloride dropwise, and keeping the temperature for 4 hours. Pour the reaction solution into ethanol to terminate the reaction, centrifuge the reaction solution, wash with ethanol, and dry t...

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Abstract

The invention discloses a method of preparing papermaking enhancer from waste paper, which includes the steps of: shearing waste paper into small chips and performing deinking treatment; processing the paper chips into nano-cellulose with concentrated sulfuric acid; modifying the nano-cellulose with 2,3-epoxypropyltrimethylammonium chloride to obtain cation nano-cellulose; finally mixing and grinding the cation nano-cellulose, chitosan and a surfactant to prepare an enhancer. In the invention, the nano-cellulose is small in diameter and can fill the gap between fibers; meanwhile, the nano-cellulose is rich in hydroxyl groups, which can be combined with hydroxyl groups on the surface of cellulose to form a hydrogen bond, thus enhancing combining force between the fibers, and further improving tensile index, burst index, tearing index and elongation rate of paper.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a method for preparing a papermaking reinforcing agent from waste paper. Background technique [0002] At present, the use of waste to prepare new materials has attracted people's attention, and the recycling of waste paper has been valued by the paper industry because of its advantages of small investment, low energy consumption, saving raw materials, and protecting the forest environment. According to the prediction of the China Paper Association, the amount of waste paper products in my country will reach 535.98 million tons from 2011 to 2020. At present, the recycled waste paper is often processed into paper by secondary use, but the fiber is susceptible to decay during the processing and utilization process, resulting in recycled paper. Performance has been reduced. [0003] Since nanocellulose fibers have a large specific surface area, are rich in surface hy...

Claims

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Application Information

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IPC IPC(8): D21C5/02
CPCD21C5/027Y02W30/64
Inventor 李玉萍史高峰
Owner JURONG MAOYUAN WEAVING FACTORY
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