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Hindered amine-containing liquid ultraviolet absorbent and preparation method thereof

A technology of UV absorber and hindered amine, which is applied in the field of liquid UV absorber containing hindered amine and its preparation, which can solve the problems of inconvenient operation and achieve the effects of high repetition rate, good light stability and reduced dosage

Active Publication Date: 2021-04-20
烟台新特路新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since solid ultraviolet absorbers and hindered amines must be dissolved with high-boiling point organic solvents and co-solvents before they are used, they must be stirred evenly and dispersed in gelatin liquid before they can be added to polymers, which is inconvenient to operate and has many disadvantages.

Method used

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  • Hindered amine-containing liquid ultraviolet absorbent and preparation method thereof
  • Hindered amine-containing liquid ultraviolet absorbent and preparation method thereof
  • Hindered amine-containing liquid ultraviolet absorbent and preparation method thereof

Examples

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Embodiment 1

[0023] This embodiment relates to a preparation method of a liquid ultraviolet absorber containing hindered amines, comprising the following steps: putting the ultraviolet absorber uv-3, pentamethylpiperidinol, and a catalyst into a reaction kettle, heat preservation reaction, washing and liquid separation, The concentrated solvent promptly obtains the product; Concrete steps are as follows:

[0024] Add 100g (0.23mol) uv-3, 83.51g (0.48mol) pentamethylpiperidinol, and 100g toluene to the reactor with a water separator, condenser, and stirrer, heat up to 120°C, and Separate the water in the raw material with a water tank, add 0.1g of tetraisopropyl titanate after the water is separated, continuously separate the ethanol generated by the reaction, cool down to 80°C after 10 hours of reaction, add 100ml of toluene and 100ml of water, and stir for 1 hour The liquid was separated, and the organic phase was concentrated under reduced pressure until it did not flow out to obtain a c...

Embodiment 2

[0029] This embodiment relates to a preparation method of a liquid ultraviolet absorber containing hindered amines, comprising the following steps: putting the ultraviolet absorber uv-3, pentamethylpiperidinol, and a catalyst into a reaction kettle, heat preservation reaction, washing and liquid separation, The concentrated solvent promptly obtains the product; Concrete steps are as follows:

[0030] Add 100g (0.23mol) uv-3, 83.51g (0.48mol) pentamethylpiperidinol, and 100g toluene to the reactor with a water separator, condenser, and stirrer, heat up to 120°C, and Separate the water in the raw material with the water device, add 0.1g of zinc chloride after the water separation is completed, and continuously separate the ethanol generated by the reaction, cool down to 80°C after 10 hours of reaction, add 100ml of toluene and 100ml of water, stir for 1 hour and let it stand for liquid separation , the organic phase was concentrated under reduced pressure until it did not flow o...

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Abstract

The invention provides a hindered amine-containing liquid ultraviolet absorbent and a preparation method thereof. The method comprises the following steps: 1, adding UV-3, a tetramethylpiperidinol alkylate and a solvent into a reactor; 2, heating to 120 DEG C, adding a catalyst, carrying out a thermal insulation reaction, and separating out ethanol generated in the reaction for 10 h; and 3, cooling to 80 DEG C, adding a solvent and water into the reactor, stirring for 1h, standing for liquid separation, carrying out negative pressure concentration on the upper-layer organic phase until no effluent flows out, and discharging to obtain colorless transparent liquid. The preparation method overcomes the defect that a solid ultraviolet absorbent and a light stabilizer in the prior art can be added into a polymer only by dissolving a cosolvent at high temperature and uniformly stirring; and the product prepared by the method has good light stability, thermal stability and efficient light absorbability, so that the additive amount is reduced, and the production cost is greatly reduced. The method is simple, high in repetition rate and safe.

Description

technical field [0001] The invention belongs to the field of chemical industry; in particular, it relates to a liquid ultraviolet absorber containing hindered amine and a preparation method. Background technique [0002] For a long time, solid UV absorbers and hindered amines have been commonly used to prevent polymers from UV aging. Because solid ultraviolet absorbers and hindered amines must be dissolved with high-boiling point organic solvents and co-solvents, stirred evenly, and then added to polymers after being dispersed in gelatin liquid, the operation is inconvenient and has many disadvantages. Contents of the invention [0003] The object of the present invention is to provide a liquid ultraviolet absorber containing hindered amine and its preparation method. [0004] The present invention is achieved through the following technical solutions: [0005] In the first aspect, the present invention relates to a liquid ultraviolet absorber containing hindered amine, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/44
CPCY02P20/584
Inventor 刘辉丁录元蔡智奇
Owner 烟台新特路新材料科技有限公司
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