Process for preparing bi-(n-octyloxy-2,2,6,6-tetramethyl-piperidyl) diester sebacate

A technology of tetramethylpiperidyl and tetramethylpiperidine is applied in the preparation field of hindered amine light stabilizers, and can solve the problems of limited application scope, poor anti-risk ability, small scale and the like, and achieves simple reaction process and high product quality. Good color and fast response

Inactive Publication Date: 2009-11-04
江苏省中兴化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the scale of my country's HALS production enterprises is relatively small, and the varieties produced are few, which cannot adapt to the development of the domestic high-speed growth polymer material industry.
All enterprises start with the production of triacetone amine, which will inevitably lead to low macro-benefits, and the HALS produced have fewer varieties with excellent

Method used

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  • Process for preparing bi-(n-octyloxy-2,2,6,6-tetramethyl-piperidyl) diester sebacate

Examples

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Example

[0012] example 1

[0013] In a four-necked flask equipped with a reflux condenser and a water separator, 76 g of bis(2,2,6,6-tetramethylpiperidine) sebacate and 450 ml of n-octane were added, and a small amount of catalyst was added and stirred The temperature is raised to 115°C, 140 grams of 70% tert-butyl hydroperoxide is added dropwise, after 6 hours, the water is continuously separated by the water separator. After dripping and refluxing for 5 hours, cool and filter, filter off the catalyst, add 10 grams of activated carbon to the filtrate and stir at room temperature for 30 minutes, then filter, the mother liquor is distilled under reduced pressure, and the n-octane is evaporated to obtain 93 grams of light yellow finished product, the yield is 80% .

Example

[0014] Example 2

[0015] In a four-necked flask equipped with a reflux condenser and a water separator, 76 g of bis(2,2,6,6-tetramethylpiperidine) sebacate and 450 ml of n-octane were added, and a small amount of catalyst was added and stirred The temperature is raised to 115°C, and 100 grams of 70% tert-butyl hydroperoxide is added dropwise. After 6 hours, the water is continuously separated by the water separator. After dripping and refluxing for 5 hours, cool and filter, filter out the catalyst, add 10 grams of activated carbon to the filtrate and stir at room temperature for 30 minutes, then filter, the mother liquor is distilled under reduced pressure, and the n-octane is evaporated to obtain 87 grams of red-brown finished product. The yield is 75%. .

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Abstract

The invention relates to a process for preparing a hindered amine light stabilizer, in particular to a process for preparing bi-(n-octyloxy-2,2,6,6-tetramethyl-piperidyl) diester sebacate by using sebacylic acid bi-(2,2,6,6-tetramethyl-piperidyl) ester, 70 percent of tert-butyl hydroperoxide and normal octane as basic raw materials and adding a certain quantity of catalysts. The process is characterized in that the molar ratio of the 70 percent of tert-butyl hydroperoxide to the sebacylic acid bi-(2,2,6,6-tetramethyl-piperidyl) ester is more than or equal to 7:1 and preferably is 7-10:1; the catalysts are added under the condition that an enough quantity of the normal octane is used as a solvent for sufficiently refluxing and reacting; and most of the normal octane is distilled to be removed to obtain a product. The process has the advantages of basically no three wastes in a production process, simple reaction and operation and convenient industrialized production.

Description

technical field [0001] The invention relates to a preparation process of a hindered amine light stabilizer, specifically a preparation process of bis(2,2,6,6-tetramethylpiperidine) sebacate, 70% tert-butyl hydroperoxide and normal A process for preparing bis(n-octyloxy-2,2,6,6-tetramethylpiperidinyl) sebacate with octane as the basic raw material and adding a certain amount of catalyst. [0002] Background technique [0003] Bis(n-octyloxy-2,2,6,6-tetramethylpiperidinyl) sebacate is a non-basic hindered amine light stabilizer product with N-substituted alkoxy structure, which can be widely used In impact polystyrene, household plastic film and coating products. Due to its superior performance, hindered amine light stabilizers (HALS) have replaced traditional light stabilizers and become the mainstream of the light stabilizer consumption market in synthetic material additives, occupying a dominant position in the consumption structure of the light stabilizer market in the...

Claims

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Application Information

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IPC IPC(8): C07D211/94
Inventor 彭广荣
Owner 江苏省中兴化工有限公司
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