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Hindered amine light stabilizer with high molecular weight and narrow molecular weight distribution and its preparation method

A hindered amine light stabilizer and high molecular weight technology, which is applied in the field of high molecular weight and narrow molecular weight distribution hindered amine light stabilizer and its preparation, can solve the problems of wide molecular weight distribution and inability to fully utilize high molecular weight hindered amines, etc., to achieve reaction Smooth, continuous and effective photostabilization, simple operation

Inactive Publication Date: 2017-05-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to address the problems existing in the prior art, and to provide a hindered amine light stabilizer with high molecular weight and narrow molecular weight distribution, so as to make up for the molecular weight distribution of the obtained high molecular weight hindered amine that exists in the existing conventional polymerization technology Wide, can not fully play the disadvantages of high molecular weight hindered amines used as light stabilizers

Method used

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  • Hindered amine light stabilizer with high molecular weight and narrow molecular weight distribution and its preparation method
  • Hindered amine light stabilizer with high molecular weight and narrow molecular weight distribution and its preparation method
  • Hindered amine light stabilizer with high molecular weight and narrow molecular weight distribution and its preparation method

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Effect test

Embodiment 1

[0031] 5.632 g of 4-acryloyloxy-1,2,2,6,6-pentamethylpiperidine, 0.0137 g of free radical initiator AIBN, RAFT chain transfer agent s,s'-bis(a,a'- Add 0.235 g of dimethyl acetic acid) trithiocarbonate into toluene, stir well, and fully dissolve; raise the reaction temperature to 70°C under the protection of nitrogen, and react for 12 hours. After the reaction is completed, use liquid nitrogen or ice water Perform quenching treatment; pour the obtained product mixture into methanol for precipitation treatment, filter with suction, wash with water, dry and wait until the final product. The number average molecular weight of the obtained product was 1326, and the molecular weight distribution index was 1.89.

Embodiment 2

[0033] 5.632 g of 4-acryloyloxy-1,2,2,6,6-pentamethylpiperidine, 0.025 g of free radical initiator AIBN, RAFT chain transfer agent s,s'-di(a,a'- Add 0.141 g of dimethyl acetic acid) trithiocarbonate into toluene, fully stir, and fully dissolve; under the protection of nitrogen, raise the reaction temperature to 70°C, and react for 12 hours. After the reaction is completed, use liquid nitrogen or ice water Perform quenching treatment; pour the obtained product mixture into methanol for precipitation treatment, filter with suction, wash with water, dry and wait until the final product. The number average molecular weight of the obtained product was 3450, and the molecular weight distribution index was 1.35.

Embodiment 3

[0035] 5.632 g of 4-acryloyloxy-1,2,2,6,6-pentamethylpiperidine, 0.103 g of free radical initiator AIBN, RAFT chain transfer agent s,s'-bis(a,a'- Add 0.352 g of dimethyl acetic acid) trithiocarbonate into toluene, fully stir and dissolve; raise the reaction temperature to 70°C under the protection of nitrogen, and react for 8 hours. After the reaction is completed, use liquid nitrogen or ice water Perform quenching treatment; pour the obtained product mixture into methanol for precipitation treatment, filter with suction, wash with water, dry and wait until the final product. The number average molecular weight of the obtained product was 1128, and the molecular weight distribution index was 2.21.

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Abstract

The invention discloses a hindered amine with high molecular weight and narrow molecular weight distribution, its preparation method and application. The process is to add polymerizable amine hindered, free radical initiator and RAFT chain transfer agent into the solvent, under the protection of nitrogen, at 60°C-85°C, react for 4-48h, and then use liquid nitrogen or ice water Perform quenching treatment, and then use a precipitant for precipitation treatment, then suction filter, wash with water, and dry to obtain hindered amines with high molecular weight and narrow molecular weight distribution. The molecular weight is 1100 to 30000, and the molecular weight distribution is below 2.5. The hindered amine prepared by the present invention can be used as a light stabilizer, which can reduce the physical loss of the small molecular weight hindered amine light stabilizer in the process of processing, and can effectively prevent the migration and volatilization of the hindered amine light stabilizer in the use process, so that the light stabilization effect It can be sustained and effective for a long time; the preparation method of the invention has simple process, low requirements on equipment, stable reaction, simple operation, no by-products, very little catalyst consumption, and is clean and environment-friendly.

Description

technical field [0001] The invention belongs to a light stabilizer and its preparation technology, in particular to a hindered amine light stabilizer with high molecular weight and narrow molecular weight distribution and a preparation method thereof. Background technique [0002] When the electromagnetic waves of solar radiation pass through space and the ozone layer, almost all rays below 290nm and above 3000nm are filtered out. Among the electromagnetic waves that actually reach the ground, the wavelength range of about 290-400nm is ultraviolet rays, while the ultraviolet rays in sunlight are harmful to human body. The main reason for the aging effect of polymer materials is that although ultraviolet light only accounts for about 5% of sunlight, its energy is very large, and its energy is enough to destroy the chemical bonds of polymers, causing molecular chains to break and crosslink, resulting in malignant changes in the mechanical properties of polymers. , Therefore, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/34C08L33/14C08L59/00
Inventor 任显诚刘文亮李永亮
Owner SICHUAN UNIV
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