Branch type dry strength agent and preparation method thereof

A dry strength agent and branched chain technology, applied in the direction of reinforcing agent addition, can solve the problems of gelation, explosion, high local concentration, etc., to achieve the effect of preventing gelation, good effect, and increasing the dry strength of paper

Active Publication Date: 2012-10-10
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some defects in these two methods: the method of adding raw materials at one time, due to the high concentration of reactants, is easy to produce implosion polymerization and then produces gelation effect; Polymers are formed at low concentrations, and then the added monomers continue to reflect in the solution of these polymers, so that the conc

Method used

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  • Branch type dry strength agent and preparation method thereof
  • Branch type dry strength agent and preparation method thereof
  • Branch type dry strength agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix 355g of water, 118g of acrylamide, 2g of itaconic acid, 16g of methacryloxyethyltrimethylammonium chloride, 0.08g of methylenebisacrylamide, 4g of hydroxypropyl acrylate, 2g of ethyl acrylate and diphenyl Stir and mix 1 g of ketone evenly, repeatedly evacuate and pass high-purity nitrogen to drive oxygen 3 times to obtain solution A;

[0035] Stir and dissolve 1 g of sodium allyl sulfonate and 50 g of water evenly, and repeatedly evacuate and pass high-purity nitrogen to drive oxygen 3 times to obtain solution B;

[0036] Add 50% of solution A and 30% of solution B into the reaction kettle washed with high-purity nitrogen to drive oxygen, raise the temperature to 75°C, turn on the ultraviolet light to irradiate the reaction kettle, and carry out photoinitiated polymerization for 60 minutes;

[0037] Continue to add 25% of solution A and 25% of solution B in the reactor to carry out photoinitiated polymerization for 30 minutes;

[0038] Continue to add 25% of soluti...

Embodiment 2

[0041].Water 350g, acrylamide 110g, maleic anhydride 2g, dimethylaminoethyl (meth)acrylate 10g, dimethylacrylamide 0.9g, hydroxypropyl methacrylate 15g, styrene 5g and benzophenone 0.7g was stirred and mixed evenly, and the high-purity nitrogen was repeatedly evacuated to drive oxygen 3 times to obtain solution A; 0.6g sodium allyl sulfonate and 60g water were stirred and dissolved evenly, and the high-purity nitrogen was repeatedly evacuated to drive oxygen 3 times. Obtain solution B; add 50% of solution A and 30% of solution B into the reaction kettle washed with high-purity nitrogen to drive oxygen, heat up to 80°C, turn on the ultraviolet light to irradiate the reaction kettle, and carry out photoinitiated polymerization for 55 minutes ; Continue to add 25% of solution A and 25% of solution B in the reactor for photoinitiated polymerization for 25 minutes; continue to add 25% of solution A and 45% of solution B in the reactor for photoinitiated polymerization until the visc...

Embodiment 3

[0044] Mix 450g of water, 82g of acrylamide, 1g of maleic acid, 10g of methacryloxyethyltrimethylammonium chloride, 0.5g of dimethylacrylamide, 2g of styrene, 1g of hydroxypropyl acrylate, and 5g of ethyl acrylate Stir and mix with 0.7 g of eosin, and repeatedly vacuumize and pass high-purity nitrogen to drive oxygen twice to obtain solution A; stir and dissolve 0.005 g of mercaptoacetic acid and 120 g of water evenly, and repeatedly pump high-purity nitrogen to drive oxygen twice to obtain Solution B: add 40% of solution A and 25% of solution B into the reaction kettle rinsed with high-purity nitrogen to drive oxygen, heat up to 85°C, turn on the ultraviolet light to irradiate the reaction kettle, and carry out photoinitiated polymerization for 70 minutes; Continue to add 35% of solution A and 35% of solution B to the reactor for photoinitiated polymerization for 25 minutes; continue to add 25% of solution A and 40% of solution B to the reactor for photoinitiated polymerizatio...

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Abstract

The invention discloses a branch type dry strength agent and a preparation method thereof. The preparation method comprises the following steps of: firstly, mixing acrylamide, negative ion monomers, positive ion monomers, crosslinking agent monomers, a photoinitiator, water and other functional monomers to obtain solution A; secondly, mixing a chain transfer agent and water to obtain solution B; thirdly, polymerizing 40%-60% of the solution A and 20%-40% of the solution B by ultraviolet ray irradiation; fourthly, adding 20%-30% of the solution A and 20%-30% of the solution B into the mixed solution in the third step to be subjected to polymerization by ultraviolet ray irradiation; fifthly, adding the residual solution A and the residual solution B into the mixed solution in the fourth step to be subjected to polymerization by ultraviolet ray irradiation until the viscosity of the solution meets requirements; and sixthly, adjusting the pH and solid content of weight of the mixed solution in the fifth step, and adding free radical catcher into the mixed solution to obtain the branch type dry strength agent. According to the branch type dry strength agent and the preparation method, the operation is simple, the viscosity is easy to control, the dispersibility of the branch type dry strength agent in water is good, the properties of ring crush, fold resistance, breaking resistance, tension resistance, internal bonding strength and the like of paper can be improved.

Description

technical field [0001] The invention relates to a dry strength agent for papermaking and a preparation process 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] Commonly used dry strength agents include natural polymers such as starch and its modified products (cationic starch, anionic starch, cross-linked starch, etc.), synthetic polymers such as polyacrylamide, polyvinyl alcohol, etc., and other water-soluble natural products. agents (such as guar gum and its derivatives, etc.). In most cases, only adding 0.1%~0.75% of such substances by mass fraction can achieve effective dry strength effect. [0004] In recent years...

Claims

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Application Information

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IPC IPC(8): D21H21/18C08F220/56C08F220/34C08F222/02C08F222/38C08F220/28C08F220/18C08F222/06C08F212/08C08F220/04C08F226/02C08F2/38
Inventor 施晓旦金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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