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Manufacturing method of light-stability agent

A technology of light stabilizer and manufacturing method, applied in the direction of organic chemistry, etc., can solve problems such as unpublished reports, inability to meet high-end customers, etc., to overcome color development factors, improve distillate yield and quality, and fast side reaction products. Effect

Inactive Publication Date: 2009-01-28
RUGAO DINGSHENG FINE CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the product is effective in use, the color of the product is far from meeting the needs of high-end customers. In response to the higher standards and requirements for product chromaticity put forward by customers in the field of use, there are many research institutes and production companies at home and abroad. Relevant research and development has been carried out as a key research topic, but no public reports of breakthroughs have been seen

Method used

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  • Manufacturing method of light-stability agent
  • Manufacturing method of light-stability agent
  • Manufacturing method of light-stability agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 225KG of pentamethylpiperidinol and 130KG of dimethyl sebacate into the transesterification reaction kettle, start stirring, pass in an inert gas——nitrogen protection, and then heat up; after the temperature rises to 115-118°C, press the feeding The number of moles is based on 3.5KG of double-effect transesterification catalyst—sodium methoxide and hydrophilic plasticizer, of which 2.5KG of sodium methoxide and 1.0KG of hydrophilic plasticizer are put into the transesterification reactor for reaction, and continue to heat up to 115~118℃ Finally, keep the temperature, control the reaction time for 9.5 hours, and carry out the atmospheric pressure solvent-free transesterification reaction to remove the by-product methanol; the reaction end point is controlled by distilling the weight of the reaction by-product methanol, and the reaction ends after passing the test.

[0024] When the reaction product is cooled to below 60°C, a measured amount of petroleum ether is added...

Embodiment 2

[0027] Other conditions are the same as in Example 1. The transesterification reaction is carried out at a reaction temperature of 165-172° C., and the reaction time is controlled for 6 hours. Finally, the chroma of the finished product is ≥80 Hezen.

Embodiment 3

[0029] Other conditions are the same as in Example 1. The transesterification reaction is carried out at a reaction temperature of 188-195° C., and the reaction time is controlled for 5 hours. Finally, the chroma of the finished product is 100-110 black.

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Abstract

The invention discloses a preparation method of a light stabilizer. Pent-amethyl and dimethyl sebacate conduct heating reaction under the function of a catalyst; the reaction product is cooled and added with measured petroleum ether; the mixture is washed by tap water into neutral for refining treatment, vacuum distillation is then conducted and qualified distillate is collected, thus obtaining the light stabilizer. The method adopts solvent-free transesterification reaction, conducts the reactions under the protection of inert gas while limitedly improving transesterification reaction temperature, ensuring fast reaction with less side reaction products; the post treatment purification adopts a combined rectification device, improving distillate producing rate and quality; the method eliminates chromogenic factors that can be produced, and can produce low-colority high-quality liquid light stabilizer GW508 products.

Description

technical field [0001] The invention relates to a method for manufacturing a light stabilizer, which belongs to the field of polymer material modification. Background technique [0002] The only liquid light stabilizer GW508 in the current hindered amine series products; scientific name: bis(1,2,2,6,6-pentamethylpiperidinyl) sebacate and 1-methyl-8-(1 , 2,2,6,6-pentamethylpiperidinyl) sebacate mixture; [0003] Structural formula: [0004] [0005] Light stabilizer GW508, as a functional additive of polymer materials or polymers, can be added in a certain proportion to have a positive effect on its function. Polymers have a wide range of uses in many fields, but due to the characteristics of the structure of most polymers, many defects are also exposed during use, and the most prominent one is that they are easy to age. When these substances are used outdoors, they will be exposed to sunlight and ultraviolet radiation, resulting in structural damage, performance degrad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/3435C07D211/46
Inventor 吴春华
Owner RUGAO DINGSHENG FINE CHEM IND
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