Stearic acid 2,2,6,6-tetramethyl-4-piperidine ester of light stabilizer and production method thereof

A technology of methyl stearate and light stabilizer, used in chemical instruments and methods, adhesive additives, non-polymer adhesive additives, etc. Poor quality and other problems, to achieve the effect of high product purity, simplified separation and purification process, and low cost

Inactive Publication Date: 2009-09-30
NANTONG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its traditional synthetic method is to carry out transesterification reaction by methyl stearate and 2,2,6,6-tetramethyl-4-hydroxypiperidine under the condition of Lewis acid and alkali as catalyst, but these catalysts are easy to corrode equipment , the pollution caused by post-processing is large, and the product quality is poor
A heterogeneous catalyst is used to catalyze the transesterification reaction, the product and the catalyst are easily separated, the corrosion to the equipment is small, and the catalyst can be recycled, but the selectivity and activity are not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] In a 250mL four-necked flask equipped with a fractionation column, add petroleum ether 40g, methyl stearate 29.2g (0.1mol), 2,2,6,6-tetramethyl-4-hydroxypiperidine 18.06g ( 0.115mol), catalyzer 0.24g, put on thermometer, agitator, put on condensing tube, start the agitator, when the temperature is raised to 110-120°C, the methanol generated during the reaction is continuously steamed out, and the reaction time is 7h (monitored by gas chromatography). reaction). After the reaction, wash with water, collect the organic phase, remove water, decolorize, crystallize the organic phase, and filter to obtain white waxy solid 2,2,6,6-tetramethyl-4-piperidinate, the product The yield is 95.47%.

Embodiment 2

[0013] In a 250mL four-necked flask equipped with a fractionation column, add petroleum ether 40g, methyl stearate 29.2g (0.1mol), 2,2,6,6-tetramethyl-4-hydroxypiperidine 18.06g ( 0.115mol), catalyzer 0.88g, put on thermometer, agitator, put on condensing tube, start the agitator, when the temperature is raised to 110-120°C, the methyl alcohol that generates is continuously steamed out in the reaction process, and the reaction time is 7h (monitored by gas chromatography). reaction). After the reaction, wash with water, collect the organic phase, remove water, decolorize, crystallize the organic phase, and filter to obtain white waxy solid 2,2,6,6-tetramethyl-4-piperidinate, the product The yield was 96.23%.

Embodiment 3

[0015] In a 250mL four-necked flask equipped with a fractionation column, add petroleum ether 40g, methyl stearate 29.2g (0.1mol), 2,2,6,6-tetramethyl-4-hydroxypiperidine 18.06g ( 0.115mol), catalyzer 1.4g, put on thermometer, agitator, put on condensing tube, start the agitator, when the temperature is raised to 110-120°C, the methanol generated during the reaction is continuously steamed out, and the reaction time is 7h (monitored by gas chromatography). reaction). After the reaction, wash with water, collect the organic phase, remove water, decolorize, crystallize the organic phase, and filter to obtain white waxy solid 2,2,6,6-tetramethyl-4-piperidinate, the product The yield is 95.75%.

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PUM

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Abstract

The invention discloses a stearic acid 2,2,6,6-tetramethyl-4-piperidine ester of a light stabilizer and a production method thereof. Methyl stearate and 2,2,6,6-tetramethyl-4-hydroxypiperidine are used as raw materials and react under the condition that a catalyst exists to obtain the stearic acid 2,2,6,6-tetramethyl-4-piperidine ester; and the catalyst is tetrabutylammonium bromide with the use amount being 0.8-4.8 percent of the methyl stearate. By utilizing the methyl stearate and the 2,2,6,6-tetramethyl-4-hydroxypiperidine as raw materials to synthesize the stearic acid 2,2,6,6-tetramethyl-4-piperidine ester and adopting the tetrabutylammonium bromide as the catalyst, the invention simplifies the separation and purification processes and has short reaction time, high product yield which reaches over 95 percent, higher product purity, great reduction of energy consumption, little environment pollution and low cost, thereby being a relatively ideal process for realizing industrial production.

Description

Technical field: [0001] The invention relates to a light stabilizer stearic acid 2,2,6,6-tetramethyl-4-piperidinate and a production method thereof. Background technique: [0002] 2,2,6,6-tetramethyl-4-piperidinate stearate is a new type of hindered amine light stabilizer, which can prolong the service time of various plastics and coatings exposed to 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 compatibility with polymers. It can be used in polyolefin plastics, polyurethanes, ABS resins, coatings, adhesives, rubbers, etc. It has excellent light stabilization effect and is non-toxic and cheap. advantage. Synergistic with UV absorbers. Its traditional synthetic method is to carry out transesterification reaction by methyl stearate an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/46B01J31/12C08K5/3435C09D7/12C09J11/06
Inventor 王树清高崇孙冬兵王歆然施振佺
Owner NANTONG UNIVERSITY
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