Method for preparing hindered amine light stabilizer by adopting solvent method

A technology of light stabilizer and solvent method, which is applied in the field of synthesis of hindered amine light stabilizers, can solve the problems of poor light transmittance, low production efficiency, and high cost of products, and achieve high light transmittance, simple process, and easy scale The effect of production

Pending Publication Date: 2021-04-16
HENGSHUI KAIYA CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a method for preparing hindered amine light stabilizers by solvent method, so as to solve the problems of low production efficiency, high energy consumption, high cost and product transparency in the existing preparation methods of hindered amine light stabilizers. poor light problem

Method used

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preparation example Construction

[0020] As described in the background art, the existing preparation methods of hindered amine light stabilizers have the problems of low production efficiency, high energy consumption, high cost and poor light transmittance of the product. In order to solve the above technical problems, the application provides a method for preparing a hindered amine light stabilizer by a solvent method. The method for preparing a hindered amine light stabilizer by a solvent method includes: under the action of a catalyst, in an organic solvent, The 2,2,6,6-tetramethylpiperidinyl parent and dimethyl sebacate are subjected to a transesterification reaction to obtain a transesterified product; the transesterified product is sequentially washed with water, filtered and desolvated to obtain a hindered amine Light stabilizers and wastewater, where the 2,2,6,6-tetramethylpiperidinyl parent has the following structure:

[0021] R is H, methyl, ethyl, isopropyl, n-propyl, n-butyl or C 1 -C 8 Alkox...

Embodiment 1

[0038] Add 2,2,6,6-tetramethylpiperidinol 120.15g (0.7653mol), dimethyl sebacate 80.06g (0.3476mol), solvent oil D20 (Yueyang Jiaxin) 175.47 g, pass into N 2 Full protection, install a condenser, start magnetic stirring, heat up to 120°C, reflux and dehydrate until there are no water droplets, add 1.74g tetraisopropyl titanate dropwise, add dropwise for 10-15min, heat up to 150°C, keep warm for reaction, reaction process After the reaction is completed, add 24g of 80% acetic acid to wash with acetic acid and water, filter, and precipitate to obtain white crystalline powder bis(2,2,6,6-tetramethylpiperidinyl) sebacic acid The ester has a product yield of 99.62wt%, a GC content of 99.41%, and a 425nm light transmittance of 99.25%. Add 50g of liquid caustic soda (containing 20% ​​sodium hydroxide) and 175.47g of solvent oil D20 to the generated waste water for extraction, and recover about 10g of 2,2,6,6-tetramethylpiperidinol with a recovery rate of 90%.

Embodiment 2

[0040] Add 120.09 g (0.7022 mol) of 1,2,2,6,6-pentamethyl-4-piperidinol, 85.38 g (0.3707 mol) of dimethyl sebacate, and solvent oil D30 ( Yueyang Jiaxin) 200.65g, N 2 Full protection, install a condenser, start magnetic stirring, heat up to 125°C, reflux and dehydrate until there are no water droplets, add 0.75g tetraisopropyl titanate dropwise, add dropwise for 10-15min, heat up to 150°C, keep warm for reaction, reaction process After the reaction was completed, 12g of 80% acetic acid was added to carry out pickling and water washing, filtration, and precipitation to obtain a light yellow liquid, that is, bis(1,2,2,6,6-pentamethylpiperidinol ) sebacate and mono(1,2,2,6,6-pentamethylpiperidinol) sebacate mixture, product yield is 99.09wt%, GC content is 99.76%, light transmittance 99.9% at 425nm. Add 22g of liquid caustic soda (containing 20% ​​sodium hydroxide) and 200.65g of solvent oil D30 to the generated waste water for extraction, and recover about 8g of 1,2,2,6,6-pent...

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Abstract

The invention provides a method for preparing a hindered amine light stabilizer by adopting a solvent method. The method for preparing the hindered amine light stabilizer by adopting the solvent method comprises the following steps: under the action of a catalyst, carrying out transesterification on a 2, 2, 6, 6-tetramethylpiperidyl parent and dimethyl sebacate in an organic solvent to obtain a transesterification product; and sequentially washing, filtering and desolventizing the ester exchange product to obtain the hindered amine light stabilizer and wastewater. By adopting the preparation method to prepare the hindered amine light stabilizer, not only is the process cost reduced, but also the purity, the recovery rate and the light transmittance of the hindered amine light stabilizer are improved.

Description

technical field [0001] The invention relates to the field of synthesis of hindered amine light stabilizers, in particular to a method for preparing hindered amine light stabilizers by a solvent method. Background technique [0002] Hindered Amine Light Stabilizer (HALS for short) is an efficient additive for inhibiting photooxidative degradation of polymer materials, and its stabilizing effect is 2-4 times that of traditional absorbing light stabilizers. This kind of light stabilizer not only has a good synergistic effect with ultraviolet absorbers and antioxidants, but also has good compatibility with various polymer materials. [0003] Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, namely UV-770, has been industrialized very early and has become a representative species of low molecular weight HALS. In order to improve the performance of hindered amine light stabilizers, many companies have developed new hindered amine light stabilizers, such as UV-292, bis(1,2,2,6,6-pe...

Claims

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Application Information

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IPC IPC(8): C07D211/46
Inventor 代广星王慧君王晓东陈志强孙春光李海平
Owner HENGSHUI KAIYA CHEM
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