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Preparation method for composite dry strength agent with high bonding strength

A dry strength agent, high bonding technology, applied in the direction of reinforcing agent addition, etc., can solve problems such as white water pollution, and achieve the effect of improving bonding strength

Inactive Publication Date: 2018-05-22
常州帝君金属构件厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention: the retention of the original starch-based dry-strengthening agent on the fiber is slightly lower than that of other high-molecular-weight polymer-based strengthening agents, and it is used in a large amount for a long time in the closed circulation system of papermaking, which is easy to cause Defects of white water pollution, a preparation method of high bond strength composite dry strength agent is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022]Add 80 mL of deionized water, 30 g of potato starch and 10 g of potato starch into a four-necked flask equipped with a reflux condenser, a stirrer and a thermometer, mix and stir for 20 min, then add 10 mL of 3-chloro-2-hydroxypropyl tris Methylammonium chloride and 6g of sodium percarbonate were mixed and reacted for 1 hour to obtain a reaction solution, and the pH value of the reaction solution was adjusted to 8 with a mass fraction of 10% sodium hydroxide solution, heated to 65° C. for 20 minutes, and cooled to obtain Self-made cationic starch, weigh 100g polypropylene and heat up to 160°C to obtain molten polypropylene, add 16g dicumyl peroxide, 30g maleic anhydride and 8mL acetone to the molten polypropylene, continue to keep warm and mix for 1h, and pour Extrude into a twin-screw machine to obtain modified polypropylene. Mix acrylamide solution with a mass fraction of 20%, dimethyl diallyl ammonium chloride and deionized water at a volume ratio of 3:1:2. In the rea...

example 2

[0024] Add 90mL of deionized water, 35g of potato starch and 15g of potato starch into a four-necked flask equipped with a reflux condenser, a stirrer and a thermometer, mix and stir for 25min, then add 11mL of 3-chloro-2-hydroxypropyltri Methylammonium chloride and 7g of sodium percarbonate were mixed and reacted for 1.5h to obtain a reaction solution, and the pH value of the reaction solution was adjusted to 9 with a mass fraction of 10% sodium hydroxide solution, heated to 70°C and kept for 25min, and discharged for cooling To obtain self-made cationic starch, weigh 150g of polypropylene and heat it up to 180°C to obtain molten polypropylene, add 18g of dicumyl peroxide, 35g of maleic anhydride and 9mL of acetone to the molten polypropylene, and continue to insulate and mix for 1.5h. And pour it into a twin-screw machine and extrude to obtain modified polypropylene. Mix acrylamide solution with a mass fraction of 20%, dimethyl diallyl ammonium chloride and deionized water at...

example 3

[0026] Add 100 mL of deionized water, 40 g of potato starch and 20 g of potato starch into a four-necked flask equipped with a reflux condenser, a stirrer and a thermometer, mix and stir for 30 min, then add 12 mL of 3-chloro-2-hydroxypropyl tris Methylammonium chloride and 8g of sodium percarbonate were mixed and reacted for 2 hours to obtain a reaction solution, and the pH value of the reaction solution was adjusted to 10 with a mass fraction of 10% sodium hydroxide solution, heated to 75° C. for 30 minutes, and cooled to obtain Self-made cationic starch, weigh 200g polypropylene and heat up to 200°C to obtain molten polypropylene, add 20g dicumyl peroxide, 40g maleic anhydride and 10mL acetone to the molten polypropylene, continue to keep warm and mix for 2 hours, and pour Extrude into a twin-screw machine to obtain modified polypropylene. Mix acrylamide solution with a mass fraction of 20%, dimethyl diallyl ammonium chloride and deionized water at a volume ratio of 3:1:2. ...

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Abstract

The invention relates to the technical field of preparation of auxiliary agents in a papermaking process, specifically to a preparation method for a composite dry strength agent with high bonding strength. According to the invention, cationic starch and cationic polyacrylamide are self-prepared; with the cationic starch as a carrier, the cationic polyacrylamide as a retention aid and polypropyleneand orthosiliconic acid as reinforcements, a reaction is performed, and hydrogen bonding is easily formed among cationic starch molecules and paper fiber molecules, so a reinforcement effect is exerted; meanwhile, charges are mutually attracted, and the cationic polyacrylamide plays retention ability, so the bonding strength between the dry strength agent and the paper fiber molecules is improved, and a polypropylene copolymer can play a certain reinforcement action; and the silicon hydroxyl group of the orthosiliconic acid generates dehydration condensation with the hydroxyl group of the paper fiber, and a stable silicon-oxygen bond is formed to be adsorbed on the surface of the paper fiber, so the bonding strength between the dry strength agent and the paper fiber molecules is further improved, and extensive application prospect is obtained.

Description

technical field [0001] The invention relates to the technical field of preparation of auxiliary agents in papermaking technology, in particular to a method for preparing a composite dry strength agent with high bonding strength. Background technique [0002] my country's paper industry uses a large number of waste paper pulp, grass fiber papermaking and a large number of applications of fillers, which reduces the strength of paper. Therefore, it is becoming more and more important to improve the strength of paper. Using dry strength agents to improve paper strength is a very effective method. [0003] Dry strength agent is an important class of chemicals used to increase the strength of paper in the paper industry. In the paper industry, it can directly interact with inorganic salt ions, fibers and other organic polymers to form an electrostatic bridge to enhance the physical strength of paper. Paper dry strength agent is widely used in the manufacture of packaging paper (co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/18D21H17/29D21H17/35D21H17/37C08B31/12C08F255/02C08F222/06C08F220/56C08F226/04
CPCC08B31/125C08F220/56C08F255/02D21H17/29D21H17/35D21H17/37D21H21/18C08F222/06C08F226/04
Inventor 管小梅杨亚生张建初
Owner 常州帝君金属构件厂
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