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Paper dry intensifier and preparation method thereof

A technology of dry strength agent and scavenger, used in papermaking, reinforcing agent addition, textile and papermaking, etc., can solve the problems of too large or too small polymer, gelation, etc., achieve good effect, prevent gelation, Simple to use effects

Active Publication Date: 2012-08-08
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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  • Paper dry intensifier and preparation method thereof
  • Paper dry intensifier and preparation method thereof
  • Paper dry intensifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] .In the reaction kettle, add 405g of water, 118g of acrylamide, 2g of itaconic acid, 16g of methacryloyloxyethyltrimethylammonium chloride, 0.08g of methylenebisacrylamide, and 1g of sodium allylsulfonate , 4 g of hydroxypropyl acrylate, 2 g of ethyl acrylate and 1 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 85° C. Irradiate ultraviolet light, react under the situation of keeping constant temperature substantially 1.5 hours, begin to take a sample every 20 minutes and carry out viscosity test afterwards, stop irradiating ultraviolet light after the viscosity reaches 4500mPa*s, add liquid caustic soda (32%, weight) 1.5g to adjust pH to 4. Finally, 0.02 g of hydroquinone is added, and water is added to adjust the weight solid content to 20%, which is the final product.

Embodiment 2

[0028] Add 400g of water, 100g of acrylamide, 2g of itaconic acid, 15g of methacryloyloxyethyltrimethylammonium chloride, 0.08g of methylenebisacrylamide, 0.8g of sodium allyl sulfonate, Stir 15g of hydroxypropyl acrylate, 5g of styrene and 0.5g 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 Ultraviolet light, reacted for 2 hours under the condition of keeping a constant temperature, and then began to take samples every 20 minutes for viscosity testing. After the viscosity reached 5000mPa*s, stop irradiating ultraviolet light, and add 1.5g of liquid caustic soda (32% by weight) to adjust the pH to 6. Finally, 2 g of sodium bisulfite is added, and water is added to adjust the solid content to 20%, which is the final product.

Embodiment 3

[0030] .Add 410g of water, 110g of acrylamide, 2g of maleic anhydride, 10g of dimethylaminoethyl (meth)acrylate, 0.9g of dimethylacrylamide, 0.6g of sodium allyl sulfonate, methacrylic acid in the reaction kettle 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, reacted for 2 hours under the situation of keeping a constant temperature substantially, and then began to take samples every 20 minutes to carry out the viscosity test. Copper sulfate 0.01g, adjusting the weight solid content to 20%, is the final product.

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Abstract

The invention provides a paper dry intensifier and a preparation method thereof. The preparation method comprises the following steps: in nitrogen atmosphere, reacting water, acrylamide, an anionic monomer, a cationic monomer, a cross-linked monomer, a chain transfer agent, other functional monomers and a photoinitiator under ultraviolet irradiation; adding a pH regulator for regulating the pH value to be 4-6; and adding a radical catcher, and mixing to obtain the paper dry intensifier. The intensifier synthesized by the method has the characteristics of low usage amount and good effect. The intensifier can be used in production of various paper such as case board paper, corrugating base paper, coated paper, cop tube paper, specialty paper and the like, and has the effect of improving the paper dry intensity, which is more remarkable when the recovered waste paper is used as papermaking raw materials. The intensifier can have an excellent paper dry enhancement effect without being added with aluminum sulfate.

Description

technical field [0001] The invention relates to an auxiliary agent for papermaking, in particular to a dry strength agent and a preparation method thereof. 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 increasing dema...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F220/18C08F220/28C08F228/02C08F212/08C08F220/14C08F2/48D21H21/18D21H17/45
Inventor 施晓旦金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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