A kind of preparation method of cationic starch/nanocellulose-based water-resistant reinforced composite emulsion

A technology of nanocellulose and cationic starch, which is applied in the field of papermaking, can solve the problems of weak strength improvement, and achieve the effects of high retention rate, good economic benefits, and mild reaction conditions

Active Publication Date: 2020-07-03
SHOUGUANG MEILUN PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The practical use of this type of sizing agent improves the water resistance to a certain extent, but the improvement of the strength is weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Preparation method of a cationic starch / nanocellulose-based water-resistant reinforced composite emulsion

[0040] Step 1. Starch oxidation

[0041] Raw materials include: corn starch, AKD wax flakes, nanocellulose suspension, ferrous sulfate, hydrogen peroxide.

[0042] Described cationic starch is corn starch, and the degree of substitution of cationic starch is 0.02;

[0043] The model of the AKD wax sheet is 1860;

[0044] The solid content of the nanocellulose suspension is 1%; the nanocellulose is cotton pulp nanocellulose, which is prepared by hydrolysis with sulfuric acid, and has an average particle size of 150nm.

[0045] Add 100kg cornstarch in the reaction kettle; then add 10kg AKD wax flakes, after mixing, heat up to 60°C and stir for 30 minutes at a stirring rate of 120rpm / min; then add 200kg of nanocellulose suspension and heat up to 72°C; then , add 0.4kg of ferrous sulfate and 30kg of hydrogen peroxide with a solid content of 30%, and stir ...

Embodiment 2

[0065] Example 2 A preparation method of cationic starch / nanocellulose-based water-resistant reinforced composite emulsion

[0066] Step 1. Starch oxidation

[0067] Raw materials include: cationic starch, AKD wax flakes, nanocellulose suspension, ferrous sulfate, hydrogen peroxide. Described cationic starch is corn starch, and the degree of substitution of cationic starch is 0.03;

[0068] The model of the AKD wax sheet is 1860;

[0069] The solid content of the nanocellulose suspension is 1%; the nanocellulose is cotton pulp nanocellulose, which is prepared by hydrolysis with sulfuric acid, and has an average particle size of 180nm.

[0070] Add 100kg cornstarch to the reaction kettle, the degree of substitution is 0.03; then add 10kg AKD wax flakes, heat up to 60°C, stir for 30 minutes at a stirring speed of 120rpm / min; then add 250kg of nanocellulose suspension, heat up to 72°C Then add 0.8 kg of ferrous sulfate and 30 kg of hydrogen peroxide with a solid content of 30%...

Embodiment 3

[0091] Example 3 Preparation method of a cationic starch / nanocellulose-based water-resistant reinforced composite emulsion

[0092] Step 1. Starch oxidation

[0093] The raw materials include: cationic starch, AKD wax flakes, nanocellulose suspension, ferrous sulfate, hydrogen peroxide; the cationic starch is corn starch, and the degree of substitution of the cationic starch is 0.04;

[0094] The model of the AKD wax sheet is 1860;

[0095] The solid content of the nanocellulose suspension is 1%; the nanocellulose is cotton pulp nanocellulose, which is prepared by hydrolysis with sulfuric acid, and has an average particle size of 200nm.

[0096] Add 100kg cornstarch to the reaction kettle, then add 10kg AKD, after mixing, heat up to 60°C and stir for 30 minutes at a stirring speed of 120rpm / min; then add 300kg of nanocellulose suspension and heat up to 72°C; then, add 1 kg of ferrous sulfate and 30 kg of hydrogen peroxide with a solid content of 30% were stirred for 1 hour a...

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Abstract

The invention provides a preparation method of a cationic starch / nano cellulose based water-resistant reinforced composite emulsion. The method includes the steps of: starch oxidation, preparation ofa mixed monomer, preparation of an initiator and reaction. The reaction includes: introducing oxidized starch into a reaction kettle, heating the oxidized starch, then adding an initiator A and an initiator B simultaneously; are dripped at the same time; 0.5-2min after adding of the initiator, starting adding of the mixed monomer; at the end of the reaction, adding texanol ester alcohol dropwise,and then performing cooling, thus obtaining the starch / nano cellulose based high water-resistant reinforced composite emulsion. The composite emulsion prepared by the method provided by the inventionhas reinforcement and water resistance functions simultaneously, also has good water resistant effect and significant reinforcement effect, and can obviously improve the paper quality and grade.

Description

technical field [0001] The invention relates to a method for preparing a cationic starch / nanocellulose-based water-resistance reinforced composite emulsion, which belongs to the technical field of papermaking. Background technique [0002] my country's paper industry is in the process of rapid development, while the paper industry is developing, it has also encountered a series of problems. How to make up for the insufficient performance of waste paper raw materials and the strength loss caused by high fillers, the use of paper-making strengthening agents provides an effective solution to the above problems. [0003] The enhancers used in the early days mainly included starch and natural vegetable gum; later developed starch derivatives, such as oxidized starch, cationic starch, anionic starch and amphoteric starch; water-soluble cellulose derivatives, such as carboxymethyl cellulose, methyl Cellulose and hydroxyethyl cellulose, etc., can effectively improve the strength of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F251/02C08F230/08C08F220/56C08F226/02C08F212/08C08F220/18D21H17/34D21H17/35D21H19/20D21H19/56D21H21/16
CPCC08F251/00C08F251/02D21H17/34D21H17/35D21H19/20D21H19/56D21H21/16
Inventor 宋晓明高珊珊张伟张革仓黄建林王鲁燕韩雪平
Owner SHOUGUANG MEILUN PAPER
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