Hindered amine light stabilizer with characteristics of high molecular weight and narrow molecular weight distribution, and preparation method thereof

A high-molecular-weight, hindered amine technology, applied in the field of light stabilizers and their preparation, can solve the problems of inability to fully exert high-molecular-weight hindered amines, wide molecular weight distribution, etc., and achieve continuous and effective light stabilization, stable reaction, and simple process flow. Effect

Inactive Publication Date: 2015-02-25
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 characteristics of high molecular weight and narrow molecular weight distribution, and preparation method thereof
  • Hindered amine light stabilizer with characteristics of high molecular weight and narrow molecular weight distribution, and preparation method thereof
  • Hindered amine light stabilizer with characteristics of high molecular weight and narrow molecular weight distribution, and preparation method thereof

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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 present invention discloses a hindered amine with characteristics of high molecular weight and narrow molecular weight distribution, and a preparation method thereof. According to the process, a polymerizable hindered amine, a free radical initiator and an RAFT chain transfer agent are added to a solvent, a reaction is performed for 4-48 h at a temperature of 60-85 DEG C under nitrogen protection, a rapid quenching treatment is performed with liquid nitrogen or ice water, a precipitation treatment is performed with a precipitant, and then suction filtration, water washing and drying are performed to obtain the hindered amine with characteristics of high molecular weight and narrow molecular weight distribution, wherein the molecular weight is 1100-30000, and the molecular weight distribution is less than 2.5. According to the present invention, the prepared hindered amine can be adopted as the light stabilizer, the physical loss of the small molecular weight hindered amine light stabilizer during the processing process can be reduced, and the migration volatilization of the hindered amine light stabilizer during the use process can be effectively prevented, such that the light stabilizing effect can be lasting and effective for a long time; and the preparation method of the present invention has characteristics of simple process, low equipment requirement, stable reaction, simple operation, no by-product production, minimal catalyst consumption, cleaning and environmental protection.

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 Applications(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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