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Amphoteric dry strength agent for paper

A dry strength agent and amphoteric technology, which is applied in the field of amphoteric dry strength agents for paper, can solve the problems of poor use effect of modified starch and secondary pollution of the environment, and achieve good fixation, less loss, and high-efficiency enhancement effects

Inactive Publication Date: 2017-06-20
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 strength agent for paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0033] An amphoteric dry strength agent for paper, the formulation of which is designed as:

[0034] In parts by weight, the ratio of the components of the amphoteric dry strength agent for paper is:

[0035] 10-50 parts of modified starch;

[0036] Monomer mixture: 80-140 parts of basic monomers, 10-25 parts of cationic monomers, 1-10 parts of anionic monomers, 1-20 parts of functional monomers, 0.1-3.5 parts of internal crosslinking monomers, first latent 5-10 parts of monomer, 0.01-2 parts of chain transfer agent and 0.01-1 part of chelating agent;

[0037] 0.1-2 parts of initiator;

[0038] 0.1-2 parts of terminator;

[0039] 3-7 parts of the second latent monomer.

[0040] The modified starch is one or more combinations of oxidized starch, cationic starch, amphoteric starch and phosphate starch.

[0041] The basic monomer is one or both of acrylamide and methacrylamide;

[0042]The cationic monomer is dimethyl diallyl ammonium chloride, dimethylaminoethyl acrylate, ...

specific Embodiment

[0052] (1) 20 grams of amphoteric starch, add 597 grams of deionized water, heat up to 75°C-90°C, and form an emulsified system after completely dissolving.

[0053] (2) In the emulsified system, add one-time feed one (water-soluble monomer mixture solution) accounting for 10% of the total weight of the feed one and account for 10% of the feed two (water-insoluble monomer mixture) in the emulsification system ), account for 20% dripping material three (initiator solution) of dripping material three gross weights. The dripping material 1 formula is: 150 grams of deionized water, 127.1 grams of acrylamide, 18 grams of dimethyl diallyl ammonium chloride, 3 grams of itaconic acid, 5 grams of hydroxyethyl acrylate, N, N-dimethyl 0.5 grams of base bisacrylamide, 6 grams of diacetone acrylamide, 0.05 grams of sodium formate, 0.07 grams of chelating agent EDTA; the formula of dripping material 2 is: 10 grams of styrene, 7 grams of butyl acrylate; the formula of dripping material 3 is:...

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PUM

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Abstract

The invention discloses an amphoteric dry strength agent for paper. By taking modified starch as a polymeric emulsifier, the starch is grafted to polyacrylamide chain macromolecules in the polymerization process to prepare a soap-free latent cross-linking type polyacrylamide emulsion as the dry strength agent for the paper. The amphoteric dry strength agent for the paper has the advantages of good strengthening effect, little loss of whitewater, good fixation, little jello, environmental protection and the like and can well improve the properties, including ring crush strength, folding strength, bursting strength, tensile strength and paper internal binding strength, of finished paper after paper pulp is added.

Description

technical field [0001] The invention relates to a papermaking additive, in particular to an amphoteric dry strength agent for paper. 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. ...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F2/24D21H21/18
CPCC08F251/00C08F2/24D21H21/18C08F220/56
Inventor 肖林伟陈宇龙刘艳青尹菊
Owner ZHEJIANG KESIKE CHEM NEW MATERIAL CO LTD
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