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High-yield preparation method for imidazoline-ammonium-salt paper softener

A high-yield imidazoline and quaternary ammonium salt technology, applied to the preparation of high-yield dialkylamide imidazoline quaternary ammonium salt paper softeners, improvement of dialkylamide imidazoline and quaternized imidazoline compounds , In the field of paper softener, it can solve the problem of high toxicity and achieve the effect of low toxicity

Active Publication Date: 2013-06-26
GUANGDONG PAPER IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since dimethyl sulfate is a highly toxic and carcinogenic monomer, the application of dimethyl sulfate has been restricted in various fields at home and abroad in recent years.

Method used

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  • High-yield preparation method for imidazoline-ammonium-salt paper softener
  • High-yield preparation method for imidazoline-ammonium-salt paper softener
  • High-yield preparation method for imidazoline-ammonium-salt paper softener

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In a 500ml four-neck flask equipped with a stirrer, a thermometer and a pressure gauge, add 230 grams of palmitic acid and heat it to a certain temperature. After stirring evenly, pass nitrogen protection, and then add 51 grams of diethylenetriamine. Seal the flask and react for 3 hours at 400 mm Hg pressure and 150°C. Then, the temperature of the system was raised to 230°C, and the reaction was carried out at a pressure of 100 mmHg for 4 hours. Heating was then stopped, and the reaction mixture was cooled to 150° C., then, 28 g of palmitic acid was added to the above mixture. The temperature of the reaction system was raised to 230° C., and the reaction was carried out under the pressure of 100 mmHg for 6 hours, then the heating was stopped, and the 1,2-substituted dialkylamide imidazoline compound was obtained by cooling.

[0016] Take 125 grams of the 1,2-substituted dialkylamide imidazoline compound prepared above and add it to a 500ml three-necked flask, heat and ...

Embodiment 2

[0018] In a 500ml four-necked flask equipped with a stirrer, a thermometer and a pressure gauge, add 258 grams of palmitic acid and heat it to a certain temperature. After stirring evenly, nitrogen protection is provided, and then 51 grams of diethylenetriamine are added. Seal the flask and react for 3 hours at 400 mm Hg pressure and 150°C. Then, the temperature of the system was raised to 230°C, and the reaction was carried out at a pressure of 100 mmHg for 8 hours. After that, the heating was stopped, and the 1,2-substituted bisalkylamide imidazoline compound was obtained by cooling.

[0019] Take 125 grams of the 1,2-substituted dialkylamide imidazoline compound prepared above and add it to a 500ml three-necked flask, heat and melt, add 60 grams of isopropanol, and then add 80 grams of 3-chloro-2-hydroxypropyl tris Methylammonium chloride was refluxed at 80°C for 3 hours. Afterwards, the material is cooled and discharged to obtain a bisalkylamide imidazoline quaternary am...

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Abstract

The invention relates to a high-yield preparation method for imidazoline-ammonium-salt paper softener. The method comprises the following: 1, a process step of bialkylamideimidazoline synthesis, in which higher fatty acid and dialkyltriamine are added into a four-opening flask by two steps in a protective atmosphere of nitrogen gas and undergo a reaction at the temperature of between 100 and 250 DEG C under a reduced pressure to obtain the bialkylamideimidazoline; and 2, a process step of bialkylamideimidazoline salting, which is to add the intermediate of the first step into a three-opening flask, add a proper amount of isopropanol into the three-opening flask, uniformly stir the mixed liquid, add an alkylating agent quaternary ammonium for salting and heat the mixed solution to obtain the bialkylamideimidazoline-ammonium-salt paper softener. The method has the advantages that: 1, the higher fatty acid is added by two steps to undergo the reaction, monamide and diamide side products are reduced, and the product quality is improved; and 2, the bialkylamideimidazoline is salted by the low-toxic alkylating agent quaternary ammonium, so the raw materials and the production process ofthe softener are environmentally-friendly and the product is more safe to use.

Description

technical field [0001] The invention relates to a paper-making softener, in particular to a preparation method of a high-yield dialkylamide imidazoline quaternary ammonium salt type paper softener. More specifically, the present invention relates to an improved method of dialkylamide imidazoline and quaternized imidazoline compound, which belongs to the technical field of papermaking aids. Background technique: [0002] Paper softener is a new type of papermaking auxiliary that can be adsorbed on fibers to increase the softness of paper and make paper feel comfortable and soft. In the past, softeners were mainly used in textiles, and were rarely used in paper processing. Crepe paper such as toilet paper and facial tissue needs to have a certain softness and feel, and easy-to-fold paper such as cellophane, waxed paper, and non-woven fabrics also requires softness, so softeners have also begun to be used in the paper industry. In recent years, the raw material of cotton pulp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/16C07D233/22D21H21/14D21H17/14
Inventor 许桂红钟广泉江锋郭伟强邓敏李倩钰
Owner GUANGDONG PAPER IND RES INST