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Preparation method of low-chlorine composite PAE wet strength agent

A PAE wet-strength agent and composite technology, which is applied in the direction of reinforcing agent addition, non-fiber pulp addition, papermaking, etc., can solve the problem of high dosage of low-chlorine wet-strength agent, achieve rapid aging speed, stable appearance and color, and good weather resistance Effect

Active Publication Date: 2021-07-23
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem of high dosage of low-chlorine wet strength agent in papermaking, etc.

Method used

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  • Preparation method of low-chlorine composite PAE wet strength agent
  • Preparation method of low-chlorine composite PAE wet strength agent
  • Preparation method of low-chlorine composite PAE wet strength agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 146 grams of adipic acid (1.0mol) and 50 grams of deionized water into a four-necked flask, stir to form a slurry, and then feed nitrogen after vacuuming, then add 104 grams of diethylenetriamine (1.01mol) in sequence, and heat up by electric heating Heat it at 180°C for 2 hours, collect about 86.5 grams of water released during the reaction, and add 215 grams of deionized water to obtain a polyamide intermediate with a solid content of 50%, a viscosity of 340 cps, and a pH of 10.2.

[0034] 100 grams (0.232 mol) of the above-mentioned polyamide aqueous solution, 50 grams of deionized water, 0.2 g of triethanolamine, and 1.0 g of potassium carbonate were heated to 25 ° C during the stirring process, and 26 grams (0.281 mol) of epichlorohydrin was added dropwise. The dripping time is 2 hours. During the whole epichlorohydrin dripping process, it is necessary to continuously add potassium carbonate solution to control the pH of the reactant in the kettle to be above ...

Embodiment 2

[0036] Weigh 132 grams of glutaric acid (1.0mol) and 75 grams of deionized water into the four-neck flask, stir to form a slurry, and then feed nitrogen after vacuuming, then add 103 grams of diethylenetriamine (1.0mol) in turn, and heat Raise the temperature to 175°C, keep it warm for 2 hours, collect about 112 grams of water released during the reaction, and add 200 grams of distilled water to obtain a polyamide intermediate with a solid content of 50%, a viscosity of 450 cps, and a pH of 9.8.

[0037] With 100 grams (0.248mol) of the above-mentioned polyamide aqueous solution, 65 grams of deionized water, 0.2 g of hexamethylenetetramine, and 1.0 g of sodium carbonate, the temperature was raised to 25 ° C during the stirring process, and 30 grams of epichlorohydrin ( 0.324mol), the dropping time is 2h. During the whole epichlorohydrin dripping process, sodium carbonate solution needs to be continuously added to control the pH of the reactant in the kettle to be above 9.0. Aft...

Embodiment 3

[0039] Weigh 146 grams of adipic acid (1.0mol) and 120 grams of deionized water and add them to a four-necked flask, stir to form a slurry, vacuumize and feed nitrogen, then add 102 grams of diethylenetriamine (0.99mol) and heat up to 180°C, keep warm for 2.0 hours, collect about 137 grams of water released during the reaction, add 212 grams of distilled water to obtain a polyamide intermediate, and its indicators are 50% solid content, 480 cps viscosity, and 9.8 pH.

[0040]With 100 grams (0.228mol) of the above-mentioned polyamide aqueous solution, 80 grams of deionized water, 0.6 g of hexamethylenetetramine, and 1.0 g of sodium carbonate, the temperature was raised to 25 ° C during the stirring process, and 30 grams of epichlorohydrin ( 0.324mol), and the dropping time is 2h. During the whole epichlorohydrin dripping process, sodium carbonate solution needs to be continuously added to control the pH of the reactant in the kettle to be above 9.5. After 30 minutes of epichloro...

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Abstract

The invention discloses a preparation method of a low-chlorine composite PAE wet strength agent. The preparation method comprises the following steps: carrying out high-temperature polymerization on dibasic acid and diethylenetriamine under a vacuumizing nitrogen condition to obtain a polyamide polyamine intermediate, slowly dropwise adding epoxy chloropropane by taking organic amine and an inorganic alkaline substance as catalysts to carry out quaternization cross-linking reaction, adding acid and water to stop the reaction after preset thermal viscosity is reached, and finally adding formaldehyde resin and sulfur-containing inorganic salt, and mixing to obtain the final polymer. The polymer disclosed by the invention contains relatively low organic chloride content, high charge density and wet strength and good stability, and is widely applied as a wet strength agent.

Description

technical field [0001] The invention relates to a preparation method of a wet strength agent in the field of paper industry additives, in particular to a preparation method of a low-chlorine composite wet strength agent. Background technique [0002] Currently commonly used wet strength agents include melamine resins, polyamide epichlorohydrin resins, and polyacrylamide resins. Polyamide-Polyamine-Epichlorohydrin (Polyamide-Polyamine-Epichlorohydrin abbreviated as PAE or PPE) resin is synthesized from dibasic acid, polyene polyamine, and epichlorohydrin, and is the most widely used wet strength agent today. [0003] Due to the complexity of the reaction process, in order to ensure the wet strength effect of the product, it is necessary to add excess epichlorohydrin (EpCl) and prolong the reaction time, which will lead to the hydrolysis of EpCl during the reaction process, or the by-products produced during the reaction process HCl reacts to generate low-molecular-weight org...

Claims

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Application Information

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IPC IPC(8): C08G69/48D21H17/55D21H21/20
CPCC08G69/48D21H21/20D21H17/55
Inventor 朱先梅鄂玉萍唐艳军冉婷陈西羽
Owner ZHEJIANG SCI-TECH UNIV
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