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Degradable polyester rubber as well as preparation method and application thereof

A technology for degrading polyester and rubber, applied in chemical instruments and methods, other chemical processes, paints containing biocides, etc., can solve problems such as oil and gas mining construction failures, deterioration of material mechanical properties, and easy tearing, and achieve excellent results Processability and vulcanization characteristics, adjustable degradation rate, wide range of application effects

Inactive Publication Date: 2021-05-11
苏州固韧纳米材料技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method of adding a degradation agent to polyurethane rubber can achieve certain results, it is also easy to lead to deterioration of the mechanical properties of the material.
In actual use, although the sealing ring made of polyurethane compound rubber can be partially degraded in high-temperature hot water, a large amount of large residues will be produced after degradation. These residues may cause blockage of oil and gas pipelines, spray holes, etc. Oil and gas mining construction failures are mainly due to the fact that raw polyurethane rubber is partially degradable
In the industry, polyurethane compound rubber also has a common problem, that is, the tear strength is low
Especially for rubber parts that need to work in harsh environments, such as seals for oil and gas development, if the material itself does not have a high enough tear strength after the surface is scratched, it is very easy to tear and cause seal failure
In addition, in the field of marine antifouling, the coating technology developed based on degradable polyester polyurethane technology (that is, adding polyurethane rubber to marine antifouling coatings) is also being highly valued, but polyurethane rubber is partially degradable. Use will also cause a certain degree of damage to the marine environment

Method used

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  • Degradable polyester rubber as well as preparation method and application thereof
  • Degradable polyester rubber as well as preparation method and application thereof
  • Degradable polyester rubber as well as preparation method and application thereof

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preparation example Construction

[0028] An aspect of the embodiment of the present invention provides a kind of preparation method of degradable polyester rubber, it comprises:

[0029] Under vacuum conditions, the first mixed reaction system comprising dimer acid, polyglycol, esterification catalyst and polycondensation catalyst undergoes a primary esterification reaction;

[0030] Adding itaconic acid, ethylene glycol and a degradation regulator to the first mixed system to form a second mixed reaction system, and a secondary esterification reaction at 130-150°C for 2-4 hours;

[0031] And, the vacuum degree of the reaction system obtained after the secondary esterification reaction is reduced to less than 200 Pa, and then the polycondensation reaction is carried out at 200-230° C. for 4-6 hours to obtain the degradable polyester rubber.

[0032] In some more specific embodiments, the preparation method includes: under the condition of a vacuum degree of 500-1000Pa, making the first mixed reaction system co...

Embodiment 1

[0076] (1) primary esterification: with 0.1mol dimer acid, 0.2mol triethylene glycol, 0.001mol tetraethylammonium bromide (consumption is 1% of dimer acid mol amount), 1.734g titanium glycolate (consumption 1% of the total mass of dimer acid and itaconic acid) into the reactor together, start stirring 100r / min, under high vacuum 1000Pa (absolute pressure), reaction temperature 120 ℃, esterification reaction 1h, then heat up To 140°C, continue to react for 1 hour to complete primary esterification;

[0077] (2) Secondary esterification: continue to put 0.9mol itaconic acid, 1.8mol ethylene glycol, 0.05mol methyl glycolate into the reaction kettle, under the conditions of 130°C normal pressure, nitrogen protection, stirring rate 80r / min Lower reaction 4h;

[0078] (3) Polycondensation: start stirring at 100r / min, gradually increase the vacuum degree to the absolute pressure of reaction 200Pa, react at 200°C for 6h, and press out with nitrogen to obtain degradable polyester rubb...

Embodiment 2

[0081] (1) primary esterification: with 0.2mol dimer acid, 0.3mol triethylene glycol, 0.001mol tetrabutylammonium bromide (consumption is 0.5% of dimer acid mol amount), 1.084g tetrabutyl titanate ( The amount used is 0.5% of the total mass of dimer acid and itaconic acid) into the reactor together, the stirring rate is turned on at 5r / min, under the conditions of high vacuum 500Pa (absolute pressure) and reaction temperature 130°C, the esterification reaction is carried out for 2h, Then the temperature was raised to 145° C., and the reaction was continued for 2 hours to complete the primary esterification;

[0082] (2) Secondary esterification: continue to put 0.8mol itaconic acid, 2.4mol ethylene glycol, 0.1mol ethyl glycolate into the reaction kettle, under the conditions of 150°C normal pressure, nitrogen protection, stirring rate 5r / min Lower reaction 2h;

[0083] (3) Polycondensation: Start stirring for 5r / min, gradually increase the vacuum degree to the absolute reacti...

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Abstract

The invention discloses degradable polyester rubber as well as a preparation method and application thereof. The preparation method comprises the steps of carrying out primary esterification reaction on a first mixed reaction system containing dimer acid, polyethylene glycol, an esterification catalyst and a polycondensation catalyst under a vacuum condition; adding itaconic acid, ethylene glycol and a degradation regulator into the first mixed system to form a second mixed reaction system, and carrying out secondary esterification reaction at the temperature of 130-150 DEG C for 2-4 hours; and reducing the vacuum degree of the reaction system obtained after the secondary esterification reaction to be lower than 200Pa, and then carrying out condensation polymerization at the temperature of 200-230 DEG C for 4-6 hours to obtain the degradable polyester rubber. The process flow is short, the prepared degradable polyester rubber has good degradation performance and processing performance, and a rubber compound prepared from the polyester rubber has excellent mechanical performance and good degradation performance; and meanwhile, the degradable polyester rubber prepared by the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of rubber synthesis, and in particular relates to a degradable polyester rubber and its preparation method and application. Background technique [0002] Since its inception, rubber materials have been favored for their high elasticity and excellent heat resistance. The original rubber was only natural rubber, and later people gradually developed a wide variety of synthetic rubbers such as styrene-butadiene rubber, isoprene rubber, nitrile rubber, and neoprene. It is not degradable in the natural environment, and it will cause serious environmental pollution problems if it is discarded in the natural environment. Dimer acid synthesized based on biochemical technology is a promising macromolecular dibasic acid, which can be polycondensed with diols to obtain polymers. There is a large difference in hydrophilic properties, resulting in incomplete reaction when dimer acid is introduced into the polycondensati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/676C08G63/78C09D5/16C08L67/06C09K3/10
CPCC08G63/676C08G63/78C09D5/1687C08L67/06C09K3/10C08L2201/06
Inventor 陈明慧孙力薛世杰骆晓楠李富民胡成
Owner 苏州固韧纳米材料技术有限公司
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