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Preparation technology of light stabilizer

A manufacturing process and light stabilizer technology, applied in organic chemistry and other fields, can solve the problems of difficult control of synthesis and violent reaction, and achieve good light stabilization effect and high added value

Inactive Publication Date: 2013-04-10
南通市振兴精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction of this product is violent when it is synthesized, and it needs to be reacted at low temperature. The synthesis is not easy to control. At present, the development of this product in China is still in the small test stage.

Method used

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  • Preparation technology of light stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Preparation:

[0014] In a 2000ml four-neck flask equipped with a condenser, a reflux tube, a thermometer, and an agitator, add quantitatively 150g of 2,2,6,6-tetramethyl-4-piperidinamine as the main ingredient, and a mass concentration of 100g The mass concentration of 30% liquid caustic soda, 50g is 50% ethanol aqueous solution, puts into the synthesis kettle, starts the stirrer, rotates after 30 minutes with 78 revolutions per minute, mixes 102g isophthaloyl chloride with 5 grams per minute and drops Addition to the above mixed solution, at the same time, start to cool the reactor to 30-35°C, keep warm at 30-35°C for 1 hour, and the sampling test is qualified; raise the temperature to 80°C, separate the lower layer of water, and then use molecular distillation on the upper layer (The vacuum reaches below 50Pa, and the temperature is 100°C; the distillation temperature under normal pressure reaches 250°C). Without crystallization, qualified products can be obtained, ...

Embodiment 2

[0016] Preparation:

[0017] In a 2000ml four-neck flask equipped with a condenser, a reflux tube, a thermometer, and an agitator, quantitatively add 160g of 2,2,6,6-tetramethyl-4-piperidinamine, and a mass concentration of 100g of 30 The mass concentration of % liquid caustic soda, 50g is 50% ethanol aqueous solution, drops into in the synthesis kettle, starts agitator, after turning 30 minutes with 78 revolutions per minute, with 102 grams of isophthaloyl chlorides with the speed of 5 gram minutes / drops Add to the above mixed solution by mixing and dropping method, and at the same time start to cool the reactor to 30-35°C, keep warm at 30-35°C for 1 hour, and the sampling test is qualified; the temperature is raised to separate the lower layer of water, and the upper layer of material is dehydrated by reflux. It is less than 0.5%, and then the qualified product is obtained by crystallization method. After testing, the yield reaches more than 85%, and the purity reaches more ...

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Abstract

The invention discloses a preparation technology of a light stabilizer UV5412. The light stabilizer is prepared by firstly preparing 4-amino-2, 2, 6, 6-tetramethyl-4-piperidine, and then, carrying out acylation synthesis, filtering and refining. The preparation technology is characterized in that 4-amino-2, 2, 6, 6-tetramethyl-4-piperidine and isophthaloyl dichloride are mixed and dropped at lower temperature of 30-35 degrees centigrade for acylation reaction. The preparation technology has the advantages that the light stabilizer UV5412 has better light stabilization effect on nylon products, and as a high-grade light stabilizer, the light stabilizer UB5412 has extremely high additional value; the quality of the light stabilizer is closely related to the ageing resistance of the nylon products; and in the technology disclosed by the invention, excellent high-grade UV5412 is provided without cost increase, and the purity of the light stabilizer is more than 98%.

Description

technical field [0001] The invention relates to a UV5412 and a manufacturing process thereof. The UV5412 is mainly prepared through an acylation reaction and a pipeline mixing method. Background technique [0002] Molecular formula: [0003] [0004] UV5412 has a good light stabilizer effect on nylon products. As a high-grade light stabilizer, this product has high added value. The reaction of this product is violent when it is synthesized, and it needs to be reacted at low temperature. The synthesis is not easy to control, and the domestic development of this product is still in the stage of small test. Contents of the invention [0005] The purpose of the present invention is to provide a manufacturing process of light stabilizer UV5412, specifically a manufacturing process of high-grade UV5412 that meets the market demand and optimizes the production method to achieve the purpose of energy saving and emission reduction. [0006] The technical solution of the presen...

Claims

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Application Information

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IPC IPC(8): C07D211/58
Inventor 陈建华徐鸿彬夏跃雄
Owner 南通市振兴精细化工有限公司
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