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Control of waste paper stock micro-adhesive material by using low molecular weight and high cation substituted ratio starch

A cationic starch, high degree of substitution technology, used in the addition of sap control agent, pulping of cellulose raw materials, paper, etc., can solve the problems of poor effect and high price, and achieve good control ability, good water solubility, and high efficiency control. effect of effect

Inactive Publication Date: 2009-09-09
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in general, inorganic aluminum sulfate and polyaluminum chloride are not as effective as organic polyelectrolytes in medium-alkaline papermaking systems; polyamines, polydimethyldiallyl ammonium chloride, polyethyleneimine, poly Ethylene amine, etc., has the problem of high price; in today’s world where petroleum resources are increasingly depleted, cationic starch with high degree of substitution based on natural polymer modification has a broad development prospect due to its relatively convenient and easy-to-obtain raw materials

Method used

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  • Control of waste paper stock micro-adhesive material by using low molecular weight and high cation substituted ratio starch
  • Control of waste paper stock micro-adhesive material by using low molecular weight and high cation substituted ratio starch

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 1.1 Preparation of waste paper deinking pulp

[0022] Take 50g of absolutely dry waste newspaper, tear it into pieces, add 1000ml of water heated to 65°C, add 5ml of 50g / L sodium hydroxide, 7.5ml of 20g / L diethylenetriaminepentaacetic acid, 6ml of 100g / L sodium silicate , 12.5ml of 20g / L hydrogen peroxide, 5ml of 30g / L deinking agent, after mixing evenly, decompose in a standard decomposer for 20 minutes. Put the deflated slurry into a plastic bag and continue heating in a water bath at 65° C. for 30 minutes. After diluting the pulp concentration to 1%, carry out flotation deinking under a certain air flow, and the flotation time is 15 minutes. After deinking, filter the pulp with a 200-mesh mesh cloth, squeeze it dry, and balance the moisture for later use. When the self-made waste newsprint deinking pulp concentration was diluted to 3%, the cation requirement of the filtrate was measured to be 3.17mmol / L;

[0023] 1.2 Preparation of linear or branched highly substi...

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Abstract

The invention belongs to the field of chemical engineering, in particular to the industry of pulping and paper making, and relates to a novel method for controlling micro-adhesive material. The method comprises: when the electronegativity of sizing agent is stronger, low molecular weight branched-chain and high substituted ratio cationic starch is taken as control agent of the micro-adhesive material; when the strength of paper is needed to be considered, low molecular weight branched chain. The method has good controllability for the micro-adhesive materials with dissolved state and colloidal state, can effectively realize the control for the micro-adhesive material, and maintains and enhances the strength performance of the page.

Description

technical field [0001] The invention belongs to the field of chemical industry, especially the pulp and paper industry, and particularly relates to a novel control method for micro-stickies. Background technique [0002] The proportion of waste paper pulp in the fiber raw material structure of my country's papermaking industry is increasing year by year, which greatly saves forest resources and energy. However, the extensive reuse of waste paper also increases the types and complexity of pollutants in the paper production process, among which the control of stickies is a major difficulty. Based on particle size, stickies can be divided into macrostickies and microstickies. Most of microstickies exist in the state of dissolution or colloid, which is more severe than macrostickies. It is difficult to control, and its accumulation will have a great adverse effect on the continuous operation of the paper machine and paper quality, and at the same time increase the consumption o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/22D21H21/04D21H17/29
Inventor 王立军罗灵芝查瑞涛
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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