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UV292 preparing method

A reactor, the technology of dimethyl sebacate, applied in the preparation field of UV292, can solve the problems of explosion, hidden danger, easy volatilization, etc., and achieve the effect of avoiding hidden danger, convenient separation, and saving cost input.

Active Publication Date: 2016-10-12
杭州欣阳精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, petroleum ether needs to be used in this process, and petroleum ether itself has the characteristics of inflammability and explosion, and it is extremely volatile. When the volume fraction of petroleum ether in the air reaches more than 1.1%, it may explode, thus giving UV292 The preparation of the plant has buried a safety hazard
Therefore, there is still a lot of room for revision

Method used

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preparation example Construction

[0025] A preparation method for UV292, comprising the following steps: Step 1: 2,2,6,6-tetramethylpiperidinol and dimethyl sebacate are passed into a reactor, and then the temperature of the reactor is raised to 165°C ~ 180°C, at this time, turn on the magnetic stirring device in the reactor, and evenly stir and mix the 2,2,6,6-tetramethylpiperidinol and dimethyl sebacate in the molten state; Step 2: Add n-butyl titanate catalyst to the reactor, and the n-butyl titanate catalyst is 2% to 12% of the substrate amount in the reactor; Step 3: After adding n-butyl titanate catalyst, simultaneously add Nitrogen is passed into the reactor to empty the air in the reactor, and keep it warm for 4-6 hours. At the same time, every 1-2 hours, slowly release the pressure in the reactor and replenish nitrogen into the reactor at the same time; Step 4: Wait for After the reaction is completed, lower the temperature of the reactor to 80°C to 85°C, add water and soda ash to the reactor, and con...

Embodiment 1

[0035]A preparation method of a hindered amine light stabilizer, adding 10 mol of raw material dimethyl sebacate and 17 mol of 2,2,6,6-tetramethylpiperidinol into a reactor, and raising the temperature to 165°C to 180°C ℃, turn on the magnetic stirring device for stirring, and add n-butyl titanate whose molar mass is 8% of the substrate, and at the same time pass nitrogen gas, empty the air in the reactor, keep the temperature for 4 hours, and release the reaction every 2 hours At this time, the conversion rate of dimethyl sebacate is 94.3%, the diester content is 70.5%, and then the temperature is lowered to 80°C-85°C, and 100mol-138mol of water is added, and soda ash is added at the same time Keep the pH value of the solution in the reactor at 9 to 10, and continue the heat preservation reaction for 2 hours, but after the reaction at this stage, add 21.8mol methyl chloride to the reactor, keep the temperature for 30 minutes, and then separate the liquid while it is hot, filte...

Embodiment 2

[0037] A preparation method of a hindered amine light stabilizer, adding 10 mol of raw material dimethyl sebacate and 22 mol of 2,2,6,6-tetramethylpiperidinol into a reactor, and raising the temperature to 165°C to 180°C ℃, turn on the magnetic stirring device for stirring, and add n-butyl titanate whose molar mass is 8% of the substrate. At the same time, nitrogen gas is introduced to empty the air in the reactor, keep the temperature for 6 hours, and release the reaction every 1 hour. At this time, the conversion rate of dimethyl sebacate is 96.7%, and the diester content is 74.7%. After that, the temperature is lowered to 80°C~85°C, and 100mol~138mol of water is added. Soda ash keeps the pH value of the solution in the reactor at 9-10, and continues to keep warm for 4 hours, but after the reaction at this stage, add 21.8mol methyl chloride to the reactor, keep warm for 45 minutes, and then separate and filter while hot , washing and dehydration etc. until the UV292 with a p...

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Abstract

A UV 292 preparing method comprises the steps of S1, adding 2,2,6,6,-tetramethyl piperidine and dimethyl sebacate into a reactor to be molten and mixed; S2, adding tetrabutyl titanate into the reactor; S3, introducing nitrogen into the reactor and carrying out thermal-insulation reaction; S4, cooling a temperature of reactant to 80 DEG C to 85 DEG C after reaction is finished, adding water and sodium carbonate into the reactor and continuously carrying out thermal-insulation reaction for 1-2h; S5, adding methanol or methyl chloride into the reactor and carrying out thermal-insulation reaction for 30-45min; S6, separating liquid, filtering, washing and dewatering to obtain UV292 with the purity as 98% or above before cooling after the reaction is completely finished. The UV292 preparing method avoids a step of dissolving the reactant into solvent, so that collision between molecules of the reactant is facilitated, and the reacting efficiency is improved. Furthermore, the cost of the solvent is also saved, the reaction is always in alkalescence is guaranteed, reaction between the tetrabutyl titanate catalyst and water is facilitated, and purification of final products is facilitated.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a preparation method of UV292. Background technique [0002] Due to its superior performance, hindered amine light stabilizers have become the mainstream of the light stabilizer consumption market in synthetic material additives, and occupy a dominant position in the consumption structure of the light stabilizer market in the world. With the continuous deepening of the basic research and application research of light stabilizers, the application range of hindered amine light stabilizers is constantly expanding. At present, the application of hindered amine light stabilizers has covered many fields such as agricultural film, engineering plastics, fibers, polymer coatings, artificial carpets and various outdoor plastic products. [0003] In order to improve the performance of hindered amine light stabilizers, many companies have developed new hindered amine light stabilizers, suc...

Claims

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Application Information

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IPC IPC(8): C07D211/46
CPCC07D211/46
Inventor 周兴旺潘行平
Owner 杭州欣阳精细化工有限公司
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