Composite depolymerizing agent for delta-valerolactone polymer, and using method of composite depolymerizing agent

A depolymerization agent, valerolactone technology, applied in the direction of organic chemistry, etc., can solve the problem of no good polymerization inhibition effect, achieve excellent depolymerization effect, simple operation, and simple preparation process

Inactive Publication Date: 2018-10-23
MAIQI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are reports about the depolymerization of similar substance caprolactone polymers, and U.S. Patent No. 4,360,682 has reported a kind of

Method used

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  • Composite depolymerizing agent for delta-valerolactone polymer, and using method of composite depolymerizing agent
  • Composite depolymerizing agent for delta-valerolactone polymer, and using method of composite depolymerizing agent
  • Composite depolymerizing agent for delta-valerolactone polymer, and using method of composite depolymerizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of composite depolymerization agent of δ-valerolactone polymer, described composite depolymerization agent comprises depolymerization agent, stabilizer and water removal agent, and described depolymerization agent is made of stannous octoate and / or 1,3-di It is composed of substituting imidazole carbene; the stabilizer is selected from alkyl phosphorous acid; the dewatering agent is selected from calcium carbonate. The composite depolymerizing agent is prepared by mixing the depolymerizing agent: stabilizer: dewatering agent at a ratio of 100:5:15 (by mass).

[0019] The depolymerization experiment was divided into 6 groups according to the content of stannous octoate and 1,3-disubstituted imidazocarbene in the composite depolymerization agent. Group 1: no stannous octoate, only 1,3-disubstituted imidazocarbene; Group: The mass ratio of stannous octoate and 1,3-disubstituted imidazocarbene is 1:4; Group 3: The mass ratio of stannous octoate and 1,3-disubstituted ...

Embodiment 2

[0025] Mix and prepare the depolymerizing agent with the mass ratio of depolymerizing agent: stabilizer: dewatering agent being 100:5:15. Wherein the depolymerization agent is stannous octoate and 1,3-disubstituted imidazocarbene, the mass ratio of stannous octoate and 1,3-disubstituted imidazolcarbene is 3:2; the stabilizer is composed of alkyl phosphorous acid, aromatic phosphorous acid , hydroxyphenylpropionic acid, benzyl alcohol or hydroquinone or one or more of them; the dewatering agent is composed of one or two of clay, alumina, silica gel, zeolite, calcium chloride, calcium carbonate or potassium bicarbonate more than one composition.

[0026] The depolymerization experiment was divided into 5 groups according to the difference between the stabilizer and the dehydrating agent in the composite depolymerizing agent. Group 7: the stabilizer was hydroxyphenylpropionic acid, the dehydrating agent was calcium carbonate and aluminum oxide, and The mass ratio is 1:1; Group 8...

Embodiment 4

[0037] A kind of composite depolymerization agent of δ-valerolactone polymer, described composite depolymerization agent comprises depolymerization agent, stabilizer and water removal agent, and described depolymerization agent is made of stannous octoate and 1,3-disubstituted imidazole Composed of carbene; the stabilizer is made of alkyl phosphorous acid; the dewatering agent is made of calcium carbonate. The composite depolymerizer is prepared by mixing stannous octoate: 1,3-disubstituted imidazocarbene: alkyl phosphorous acid: calcium carbonate at a ratio of 60:40:5:15 (by mass).

[0038]The depolymerization experiment was divided into three groups according to the different depolymerization reaction temperatures: Group 13, the reaction temperature was 180°C; Group 14, the reaction temperature was 200°C; Group 15, the reaction temperature was 220°C.

[0039] The depolymerization steps of δ-valerolactone polymers are as follows: 300g of δ-valerolactone polymers melted under ...

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Abstract

The invention in particular relates to a composite depolymerizing agent for a delta-valerolactone polymer, and an using method of the composite depolymerizing agent. The composite depolymerizing agentis prepared from a depolymerizing agent, a stabilizing agent and a water removal agent; the depolymerizing agent is prepared from stannous octoate and/or 1, 3-disubstituted imidazole carbene; the stabilizing agent is prepared from one or two or more of alkyl phosphorous acid, aromatic phosphorous acid, hydroxyphenylpropionic acid, benzyl alcohol or hydroquinone; the water removal agent is prepared from one or two or more of clay, alumina, silica gel, zeolite, calcium chloride, calcium carbonate or potassium hydrogen carbonate. The using method of the composite depolymerizing agent comprises the following steps: sealing the delta-valerolactone polymer in a container, and heating for melting under the water bath condition at 85-95 DEG C; transferring the melted delta-valerolactone polymer into a four-neck bottle, enabling the four-neck bottle to be connected with a condenser pipe, adding the composite depolymerizing agent into the four-neck bottle, heating, standing for reacting, then stirring, and carrying out a reaction to obtain a delta-valerolactone crude product.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a composite depolymerizing agent for δ-valerolactone polymers and a using method thereof. Background technique [0002] δ-Valerolactone (Delta-Valerolactone), also known as 1,5-valerolactone, tetrahydro-α-pyrone, cyclovalerolactone, etc. δ-valerolactone is a colorless or light yellow liquid with aromatic odor, slightly soluble in water, easily soluble in organic solvents such as ethanol, ether, benzene, acetone, etc., and it is easy to polymerize when it is left standing. δ-valerolactone is an important organic intermediate raw material, which is easy to polymerize with esters such as caprolactone to form polylactide. Because polylactide is soft, transparent, and easy to degrade, it can be used in the medical field to treat wounds, etc. . δ-valerolactone has an aromatic smell and can also be used in daily chemical products such as sunscreens and daily dete...

Claims

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Application Information

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IPC IPC(8): C07D309/30
CPCC07D309/30
Inventor 高培玉闫广学宋国全李清霞周淑飞吴正岭肖强李凯
Owner MAIQI CHEM CO LTD
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