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Method for preparing light stabilizer 4-p-toluenesulfonamide-2,2,6,6-tetramentylniperidine

A technology of toluenesulfonamido and tetramethylpiperidine is applied in the field of preparation of light stabilizer 4-p-toluenesulfonamido-2,2,6,6-tetramethylpiperidine, and achieves low environmental pollution, The effect of high product yield and high purity

Inactive Publication Date: 2012-09-12
南通惠康国际企业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although 4-p-toluenesulfonamido-2,2,6,6-tetramethylpiperidine has been used for a long time, but about 4-p-toluenesulfonamido-2,2,6,6-tetramethylpiperidine The synthesis of domestic literature has not been reported, so the research on the preparation method of 4-p-toluenesulfonamido-2,2,6,6-tetramethylpiperidine has important industrial application value

Method used

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  • Method for preparing light stabilizer 4-p-toluenesulfonamide-2,2,6,6-tetramentylniperidine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a 250mL four-necked flask, add 60g of solvent, 15.6g of 4-amino-2,2,6,6-tetramethylpiperidine, 14.3g of catalyst, and 24.8g of p-toluenesulfonyl chloride, and reflux and condense Tube, thermometer, start the agitator, control the temperature at 10-35°C, and the reaction time is 2.5-8h. After the reaction is completed, add 50g of water to dissolve the salt and catalyst generated by the reaction, let go of the saline solution, and wash once with 50g of water. Collect the organic phase, heat and reflux to separate the water, cool down the organic phase after water separation by 10-15°C, crystallize, and filter to obtain 4-p-toluenesulfonamido-2,2,6,6-tetramethylpiperidine , the product yield is 90.85%, and the melting point is 179-180°C.

Embodiment 2

[0020] In a 250mL four-neck flask, add 60g of solvent, 15.6g of 4-amino-2,2,6,6-tetramethylpiperidine, 15.4g of catalyst, 26.7g of p-toluenesulfonyl chloride, and reflux and condense Tube, thermometer, start the agitator, control the temperature at 10-35°C, and the reaction time is 2.5-8h. After the reaction is completed, add 50g of water to dissolve the salt and catalyst generated by the reaction, let go of the saline solution, and wash once with 50g of water. Collect the organic phase, heat and reflux to separate the water, cool down the organic phase after water separation by 10-15°C, crystallize, and filter to obtain 4-p-toluenesulfonamido-2,2,6,6-tetramethylpiperidine , the product yield is 91.06%, and the melting point is 179-180°C.

Embodiment 3

[0022] In a 250mL four-neck flask, add 60g of solvent, 15.6g of 4-amino-2,2,6,6-tetramethylpiperidine, 16.5g of catalyst, 28.6g of p-toluenesulfonyl chloride, and reflux and condense Tube, thermometer, start the agitator, control the temperature at 10-35°C, and the reaction time is 2.5-8h. After the reaction is completed, add 50g of water to dissolve the salt and catalyst generated by the reaction, let go of the saline solution, and wash once with 50g of water. Collect the organic phase, heat and reflux to separate the water, cool down the organic phase after water separation by 10-15°C, crystallize, and filter to obtain 4-p-toluenesulfonamido-2,2,6,6-tetramethylpiperidine , the product yield is 91.96%, and the melting point is 179-180°C.

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Abstract

The invention discloses a method for preparing a light stabilizer 4-p-toluenesulfonamide-2,2,6,6-tetramentylniperidine. P-toluenesulfonyl chloride and 4-amino-2,2,6,6-tetramentylniperidine which are taken as raw materials are reacted in the presence of a catalyst and a solvent to form the 4-p-toluenesulfonamide-2,2,6,6-tetramentylniperidine. The 4-p-toluenesulfonamide-2,2,6,6-tetramentylniperidine is prepared from the p-toluenesulfonyl chloride and the 4-amino-2,2,6,6-tetramentylniperidine, the separation and purification processes are simple, the reaction time is short, the yield of the product is over 90 percent, the product purity is high, energy consumption is low, environmental pollution is light, the cost is low, and the method is an ideal process for industrial production.

Description

technical field [0001] The invention relates to a preparation method of light stabilizer 4-p-toluenesulfonamido-2,2,6,6-tetramethylpiperidine. Background technique [0002] 4-p-Toluenesulfonamido-2,2,6,6-tetramethylpiperidine. It is a hindered amine light stabilizer with high efficiency and low toxicity, and the product is not easy to volatilize during high temperature processing. It has good compatibility with most industrial solvents, and has excellent polymer compatibility. It can be used in polyolefin resin, ABS resin, polyurethane and other products. When 0.35% is added to low-density polyethylene, it has good compatibility with resin and is resistant to hydrolysis. , Resistance to extraction, no coloring, and better photostability than commonly used UV absorbers. In order to enhance the weather resistance effect, it is often used in conjunction with benzophenone-based ultraviolet light absorber UV-531 and antioxidant phosphite. Its molecular formula is C 16 h 26 N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/58
Inventor 王树清王歆然杜承贤祈云田新荣
Owner 南通惠康国际企业有限公司
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