Light stabilizer and production method thereof

A light stabilizer and production method technology, applied in the direction of organic chemistry, can solve the problems of large pollution, poor product quality, and easy-to-corrosion equipment, and achieve the effects of simplifying the separation and purification process, short reaction time, and small environmental pollution

Inactive Publication Date: 2010-05-26
南通惠康国际贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, the synthetic method of light stabilizer-292 is to use dimethyl sebacate and 1,2,2,6,6-pentamethyl-4-hydroxypiperidine as raw materials, and tetraisopropyl titanate as Catalyst for transesterification reaction, although the product yield is high, but because the catalyst produces a large amount of sewage in the post-treatment process, the environmental pollution is great, so it is not suitable for industrial production
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Method used

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  • Light stabilizer and production method thereof
  • Light stabilizer and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] In a 250mL four-neck flask equipped with a thermometer, add xylene 40g, dimethyl sebacate 23.0g (0.1mol), 1,2,2,6,6-pentamethyl-4-hydroxypiperidine 28.26 g (0.165mol), catalyzer 1g, this catalyzer is dibutyl tin oxide, loads on condenser, starts agitator, when being warmed up to 110-130 ℃, constantly steams the methyl alcohol that generates in the reaction process, reaction time 2.5h ( The reaction was monitored by liquid chromatography). After the reaction is finished, filter and wash with water, collect the organic phase, and dewater, decolorize, and desolventize the organic phase to obtain the light stabilizer-292 with a product yield of 96.31%.

Embodiment 2

[0021] In a 250mL four-neck flask equipped with a thermometer, add xylene 40g, dimethyl sebacate 23.0g (0.1mol), 1,2,2,6,6-pentamethyl-4-hydroxypiperidine 28.26 g (0.165mol), catalyst 1.2g, the catalyst is dibutyltin oxide, install a condenser, start the agitator, when the temperature rises to 110-130°C, the methanol generated during the reaction is continuously distilled out, and the reaction time is 2.5h (Reaction monitored by liquid chromatography). After the reaction is finished, filter and wash with water, collect the organic phase, and dewater, decolorize, and desolventize the organic phase to obtain Light Stabilizer-292 with a product yield of 96.67%.

Embodiment 3

[0023] In a 250mL four-neck flask equipped with a thermometer, add xylene 40g, dimethyl sebacate 23.0g (0.1mol), 1,2,2,6,6-pentamethyl-4-hydroxypiperidine 29.12 g (0.17mol), catalyst 1.0g, the catalyst is dibutyltin oxide, install a condenser, start the agitator, when the temperature rises to 110-130°C, the methanol generated during the reaction is continuously distilled out, and the reaction time is 2.5h (Reaction monitored by liquid chromatography). After the reaction is finished, filter and wash with water, collect the organic phase, and dewater, decolorize, and desolventize the organic phase to obtain the light stabilizer-292 with a product yield of 96.84%.

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Abstract

The invention discloses a light stabilizer-292 and a production method thereof. The light stabilizer-292 is prepared by taking dimethylbenzene, dimethyl sebacate and 1,2,2,6,6-pentamethyl-4-hydroxypiperidine as raw materialls and reacting in the presence of a catalyst. According to the method, the dimethylbenzene, the dimethyl sebacate and the 1,2,2,6,6-pentamethyl-4-hydroxypiperidine are used as the raw materials to synthesize the light stabilizer-292, and the dibutyltin oxide catalyst is adopted, so the method has the advantages of simplifying separation and purification processes, having short reaction time and high product yield, ensuring that the yield of products reaches over 96 percent, reducing energy consumption, and having less environmental pollution and low cost, which is an ideal process for realizing industrialized production.

Description

Technical field: [0001] The present invention relates to a light stabilizer-292 and its production method. Background technique: [0002] Light Stabilizer-292 is a new type of hindered amine light stabilizer, which can prolong the service time of various plastics and coatings in outdoor exposure. During use and processing, it will not produce odor with polymers, nor will it affect the original color of the material. The product is not easy to volatilize during high temperature processing. It has good compatibility with most industrial solvents and has excellent polymer compatibility. In order to prevent the damage of ultraviolet light, a light stabilizer is used to solve the problem of degradation under sunlight exposure. For most photodegradable polymers, hindered amine light stabilizer is a kind of efficient stabilizer. They do not absorb UV light themselves but act to limit the degradation of polymers, and can play a significant stabilizing effect at lower concentratio...

Claims

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Application Information

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IPC IPC(8): C08K5/3435C07D211/46
Inventor 孙冬兵王树清夏明姚淑玉杜承贤祁云
Owner 南通惠康国际贸易有限公司
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