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A dry strength agent for paper

A dry strength agent and paper technology, applied in the field of papermaking additives, can solve the problems of secondary environmental pollution and poor use effect of modified starch, and achieve the effects of less loss, good fixation and narrow molecular weight distribution

Active Publication Date: 2019-06-28
ZHEJIANG KESIKE CHEM NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of using modified starch is not good. The existing polyacrylamide dry strength agent is usually added with a small molecule emulsifier during preparation, which will cause secondary pollution to the environment. Good, Environmentally Friendly Polyacrylamide Dry Strengthener for Paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0032] A dry strength agent for paper, the formula is: in parts by weight, the ratio of the components of the dry strength agent for paper is: 20-40 parts of polyvinyl alcohol cationization solution;

[0033] Monomer mixture: 90-170 parts of basic monomer, 10-25 parts of cationic monomer, 1-10 parts of anionic monomer, 1-20 parts of functional monomer, 0.1-2 parts of cross-linking monomer, 0.01-2 parts of chain transfer agent 2 parts and 0.01 to 2 parts of chelating agent;

[0034] 0.1-2 parts of initiator;

[0035] 0.1 to 2 parts of terminator.

[0036] The polyvinyl alcohol cationization solution consists of the following components in parts by weight: 100 parts of polyvinyl alcohol, 1-5 parts of cationic etherification agent, and 900-1000 parts of deionized water.

[0037] The cationic etherifying agent is one or both of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 2,3-epoxypropyltrimethylammonium chloride.

[0038] The basic monomer is one or both of acrylamid...

specific Embodiment

[0049] (1) Polyvinyl alcohol cationization: Add 900 grams of deionized water, 100 grams of polyvinyl alcohol, and 3 grams of 2,3-epoxypropyltrimethylammonium chloride in a 1000ml four-necked flask, and use 10% hydrogen Adjust the pH value of the sodium oxide solution to 8.5-9.5, keep the reaction at 75°C-90°C for 60-90 minutes, adjust the pH value to 4.5 with dilute sulfuric acid to obtain the polyvinyl alcohol cationization solution, take 30 grams of the polyvinyl alcohol cationization solution, Add 523 grams of deionized water and mix to form an emulsified system;

[0050] (2) The emulsification system is heated up to 75°C to 90°C, and at the same time, one-time addition of dripping material one (water-soluble monomer mixture solution) accounting for 10% of the total weight of dripping material one, and 10% of dripping material two accounting for the total weight of dripping material two (water-insoluble monomer), accounting for 20% of the total weight of the dripping materi...

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Abstract

The invention discloses a paper dry strength agent. Polyvinyl alcohol is etherified by a cationic etherifying agent to serve as a polymer emulsifier for preparation of a soap-free polymerization cross-linked polyacrylamide emulsion, which is used as a paper dry strength agent. The paper dry strength agent provided by the invention has the advantages of good strengthening effect, small loss in white water, good fixation, few jello, and environmental protection, etc. After being added into paper pulp, the dry strength agent can well improve the circumferential pressure, folding resistance, breakage resistance, tension, paper internal bonding strength and other performance of finished paper.

Description

technical field [0001] The invention relates to a papermaking additive, in particular to a paper dry strength agent. Background technique [0002] With the development of my country's economy and the improvement of people's living standards, people's demand for paper is increasing, and the requirements for paper quality are getting higher and higher, which largely promotes the development of my country's paper industry. The strength of paper is affected by many factors, first of all depends on the bonding force between the fibers in the paper and the strength of the fibers themselves, as well as the arrangement and distribution of the fibers in the paper. The most important thing is the binding force between fibers. There are generally four types of binding force between fibers: chemical bond, hydrogen bond, van der Waals force and fiber surface interweaving force. Among them, the hydrogen bonding force is the main way to produce the paper bonding strength. There are quite ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/18
CPCD21H21/18
Inventor 肖林伟陈宇龙刘艳青尹菊
Owner ZHEJIANG KESIKE CHEM NEW MATERIAL CO LTD
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