Amphoteric dry strength agent and preparation method thereof

A dry strength agent, amphoteric technology, applied in the field of preparation of amphoteric dry strength agent to increase paper strength, can solve the problems of gelation, too large or too small polymer, etc., to prevent gelation, good effect, excellent paper The effect of dry enhancement

Active Publication Date: 2013-11-06
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of adding a cross-linking agent is often used to obtain a branched-chain dry strength agent, but there is often a common problem, that is, the problem of controlling the reaction process. The viscosity of the obtained polymer often appears too large or too small, and improper control often causes problems. Gelation occurs

Method used

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  • Amphoteric dry strength agent and preparation method thereof
  • Amphoteric dry strength agent and preparation method thereof
  • Amphoteric dry strength agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 405g of water, 118g of acrylamide, 3g of itaconic acid, 15g of sodium vinylsulfonate, 0.08g of methylenebisacrylamide, 0.3g of diethylaminoethyl acrylate, 0.3g of diallyldimethyl Stir 0.7g of ammonium chloride, 4g of hydroxyethyl acrylate, 2g of styrene and 1g of benzophenone, and repeatedly evacuate the reactor for 2 to 3 times, then keep the nitrogen flowing, and raise the temperature of the reactor to 85°C , the reaction system is irradiated with ultraviolet light, and reacted for 1.5 hours under the situation of maintaining a constant temperature, adding liquid caustic soda (32%, weight) 1.5g to adjust the pH to 6, finally adding hydroquinone 0.02g, adding water to adjust the weight solid content to 20 %, which is the final product.

Embodiment 2

[0027] Add 400g of water, 100g of acrylamide, 2g of itaconic acid, 15g of methacryloyloxyethyltrimethylammonium chloride, 0.08g of methylenebisacrylamide, and 0.8g of sodium allylsulfonate into the reaction kettle in sequence , 15 g of hydroxypropyl acrylate, 5 g of styrene, and 0.5 g of benzophenone were stirred evenly, and the reactor was repeatedly evacuated and nitrogen evacuated for 2 to 3 times, and then the nitrogen was maintained, and the temperature of the reactor was raised to 75 ° C. Irradiate ultraviolet light, react for 2 hours under the condition of basically keeping constant temperature, add 1.5g of liquid caustic soda (32% by weight) to adjust the pH to 4, finally add 2g of sodium bisulfite, add water to adjust the weight solid content to 20%, which is the final product .

Embodiment 3

[0029] Add water 410g, acrylamide 110g, maleic anhydride 2g, dimethylaminoethyl (meth)acrylate 10g, dimethylacrylamide 0.9g, allyl sodium sulfonate 0.6g, methacrylic acid Stir 15g of hydroxypropyl ester, 5g of styrene and 0.7g of benzophenone evenly, repeatedly evacuate the reactor for 2 to 3 times, and then maintain the nitrogen, raise the temperature of the reactor to 75°C, and irradiate the reaction system with ultraviolet light Light, react for 2 hours under the condition of keeping a constant temperature, add sulfuric acid (15% by weight) to adjust the pH to 5, finally add 0.01g of p-copper sulfate, adjust the weight solid content to 20%, which is the final product.

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Abstract

The invention discloses an amphoteric dry strength agent and a preparation method thereof. The preparation method comprises the following steps: in a nitrogen atmosphere, the mixture of water, acrylamide, anionic monomer, cationic monomer, cross-link monomer, a chain transfer agent and other functional monomer and photoinitiator is subjected to ultraviolet irradiation reaction; pH regulator is added to adjust a pH value after the reaction is finished; and free radical catcher is added to obtain the product. The anionic monomer is the mixture of itaconate and sodium vinylsulfonate with the mass ratio of 1 to (3 to 5); the cationic monomer is the mixture of acrylic acid lignocaine ethyl ester and diallyl dimethyl ammonium chloride with the mass ratio of 1 to (2 to 3); and the functional monomer is the mixture of styrene and hydroxyethyl acrylate with the mass ratio of 1 to (1.5 to 3.5). The amphoteric dry strength agent has the characteristics of small dosage and good effect; particularly, when reclaimed waste paper pulp is adopted as papermaking raw material, the effect is more remarkable; and an excellent paper dry-strengthening effect is achieved under the condition that no aluminium sulphate is added.

Description

technical field [0001] The invention relates to a preparation method of an amphoteric dry strength agent for increasing paper strength in the papermaking industry. Background technique [0002] Dry strength agent is an important class of chemicals in the paper industry to increase the strength of paper. It is usually used to compensate for the decrease in paper strength caused by adding fillers or low-grade fibers (such as recycled fibers). Many water-soluble polymers capable of forming hydrogen bonds with fibers can be used as dry strength agents. [0003] In recent years, the utilization rate of waste paper resources in my country has been increasing year by year, and the development potential is huge. However, the increase in the utilization rate of waste paper means the increase in the number of waste paper recycling, which will cause a sharp drop in the paper strength index, so it is necessary to add a dry strength agent to enhance the paper strength. With the increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F226/02C08F222/02C08F228/02C08F212/08C08F220/28C08F2/48C08F2/38D21H21/14
Inventor 施晓旦金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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