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Reinforcing agent for paper surface sizing and preparation method thereof

A surface sizing and strengthening agent technology, applied in papermaking, paper coating, water repellent addition, etc., can solve the problems of difficulty in forming a continuous and complete film, affecting paper strength, and poor moisture resistance, so as to improve product utilization efficiency, improving paper strength, and improving water resistance

Inactive Publication Date: 2015-04-08
深圳市瑞成科讯实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2) Moisture resistance is poor, and moisture resistance sizing agents must be added at the same time when used;
[0007] 3) The film-forming property is poor, and it is difficult to form a continuous and complete film on the surface of the paper, which affects the strength of the paper

Method used

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  • Reinforcing agent for paper surface sizing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation of embodiment 1 reinforcing agent

[0023] The steps are:

[0024] 1) Add 105g of water and 48g of tapioca starch into a 500ml reactor, start stirring and dissolving, heat up to 44°C, and keep warm for 0.2h;

[0025] 2) After constant temperature, add 15g of hydrogen peroxide solution (30%) dropwise, finish adding dropwise for 0.7h, and keep warm for 1.3h after dropping;

[0026] 3) Add 12g of polyvinyl alcohol (grade 0599), 100g of water, and keep warm for 0.5h;

[0027] 4) Then heat up to 95°C and keep warm for 2.5h;

[0028] 5) Cool down to 75°C, add 5g of ammonium persulfate aqueous solution (0.7g of ammonium persulfate, 4.3g of water) dropwise, finish the dropwise addition for 0.5h, and keep warm for 2h after the dropwise addition. The solution was cooled to room temperature to obtain the enhancer.

Embodiment 2

[0029] The preparation of embodiment 2 reinforcing agent

[0030] The steps are:

[0031] 1) Add 81g of water and 40g of cornstarch into a 500ml reactor, start stirring and dissolving, heat up to 45°C, and keep warm for 0.4h;

[0032] 2) After constant temperature, add 13.5g of hydrogen peroxide solution (30%) dropwise, finish adding dropwise for 0.6h, and keep warm for 1.5h after dropping;

[0033] 3) Add 10.4g of polyvinyl alcohol (grade 1799), 100g of water, and keep warm for 0.6h;

[0034] 4) Then heat up to 93°C and keep warm for 2.5h;

[0035] 5) Cool down to 75°C, add 5g of ammonium persulfate aqueous solution (0.5g of ammonium persulfate, 4.5g of water) dropwise, finish the dropwise addition in 0.4h, and keep warm for 2.5h after the dropwise addition. The solution was cooled to room temperature to obtain the enhancer.

Embodiment 3

[0036] The preparation of embodiment 3 reinforcing agent

[0037] The steps are:

[0038] 1) Add 98g of water and 50g of barley starch into a 500ml reactor, start stirring and dissolving, heat up to 46°C, and keep warm for 0.3h;

[0039] 2) After constant temperature, add 17g of hydrogen peroxide solution (30%) dropwise, finish adding dropwise for 0.5h, and keep warm for 1.2h after dropping;

[0040] 3) Add polyvinyl alcohol (grade 0588) 12g, water 120, keep warm for 0.7h;

[0041] 4) Then heat up to 95°C and keep warm for 3h;

[0042] 5) Cool down to 75°C, add 5g of ammonium persulfate aqueous solution (0.8g of ammonium persulfate, 4.2g of water) dropwise, finish the dropwise addition in 0.8h, and keep warm for 2h after the dropwise addition. The solution was then cooled to room temperature to obtain the enhancer.

[0043] The reinforcing agent and modified starch prepared in Examples 1 to 3 are used for surface sizing of kraft cardboard, and the paper-forming performance...

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Abstract

The invention relates to a reinforcing agent for paper surface sizing and a preparation method thereof. The preparation method comprises the following steps: modifying part of starch hydroxyl; performing cross-linking reaction for part of a starch modified group and polyvinyl alcohol in the presence of an initiator to obtain a white emulsion cross-linked polymer with a net-shaped structure. The reinforcing agent for surface sizing is low in permeability and high in utilization rate; a complete film can be formed, and thus the breaking resistance, circling pressure and water absorbing performances of paper can be improved; meanwhile; the moisture resistance of the paper can be improved; the use amount of modified starch is obviously decreased under the same strength; the use amount for starch sizing is decreased by about 25%, and use amount for paper surface sizing is decreased by about 40%.

Description

technical field [0001] The invention belongs to the field of papermaking surface sizing, in particular to an enhancer for improving paper strength. Background technique [0002] As the country vigorously advocates green and sustainable development and implements new strategies for energy conservation and emission reduction, the recycling rate of waste paper has become higher and higher. A large amount of high-yield pulp and deinked pulp will increase the short fibers and fine impurities of the pulp, and cause the physical properties of the paper to deteriorate. [0003] In order to improve the physical properties of paper such as burst resistance, ring pressure resistance, and folding resistance, paper mills generally apply surface sizing to base paper to meet the performance requirements required for paper production. Surface sizing refers to immersing the finished paper or cardboard in the sizing agent solution or using a sizing machine to apply a thin layer of sizing mat...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H19/14D21H19/20
Inventor 胡志滨王传杰潘好学
Owner 深圳市瑞成科讯实业有限公司
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