Degradable modified polyester with high heat resistance and good mechanical properties and preparation method thereof

A modified polyester, high heat resistance technology, applied in the field of degradable polyester and its preparation, can solve the problems of refractory degradation, reduced elongation at break, low glass transition temperature, etc., achieve good mechanical properties, accelerate degradation The effect of speed and good hydrophilicity

Inactive Publication Date: 2021-02-09
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the performance of PET polyester materials. First, the glass transition temperature of PET polyester is low (Tg = 70 ° C), which limits the use of high-temperature films, plug-in connectors, kitchen utensils, high-temperature resistant tableware, food, etc. Applications such as pallets
Second, the improvement of the heat resistance of PET in the past often sacrificed the excellent mechanical properties of the material, thereby limiting the application range of the modified PET polyester, such as high temperature and high pressure film, hot drink packaging, etc.
Third, PET polyester is difficult to degrade under natural conditions. With the expansion of the polyester industry and the expansion of the scope of application of materials, it has led to serious environmental problems, such as the emergence of white garbage
Invention patent CN201610831226.5 discloses a synthesis method of bio-based aromatic polyester by introducing 2,5-furandicarboxylic acid, the Tg is between 69.5 and 84.1°C, but the elongation at break is reduced to below 5%
Invention patent CN201380055463.1 discloses a copolymer of neopentyl glycol and 2,2,4,4-tetramethyl-cyclobutanediol (CBDO) and terephthalic acid, the Tg is higher than 90°C, but The elongation at break cannot meet the requirements of the mechanical properties of the film under high pressure and high temperature conditions, and the synthesis of CBDO is difficult and costly, so it cannot be commercialized temporarily
[0005] In summary, based on the prior art, there is a lack of degradable polyester with high temperature resistance and good mechanical properties.

Method used

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  • Degradable modified polyester with high heat resistance and good mechanical properties and preparation method thereof
  • Degradable modified polyester with high heat resistance and good mechanical properties and preparation method thereof
  • Degradable modified polyester with high heat resistance and good mechanical properties and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031]First, the reactor is preheated, and the preheating temperature of the reactor is set to 100°C. When the temperature in the reactor reaches 50°C, 300g of terephthalic acid, 143.3g of ethylene glycol, 76.7g of isosorbide, and Put alcohol 6.2g, catalyst antimony trioxide 80mg, antioxidant [1010] 500mg, triphenyl phosphate 100mg into the reaction kettle, and set the speed of the stirring paddle at 10r / min. During the stirring process, carry out nitrogen replacement at the same time (inflate nitrogen to 150Kpa, keep the pressure for 10s, slowly release the pressure to normal pressure, usually replace 3-5 times). Then, when the temperature in the reactor rose to 100°C, the rotation speed of the stirring paddle was gradually increased, finally to 50r / min. Under the condition of stirring paddle rotation speed 50r / min, firstly fill nitrogen to 150Kpa, then raise the set temperature of the reactor from 100°C to 230°C, and carry out pressure esterification of raw materials under n...

Embodiment 2

[0033] First, preheat the reactor, and set the preheating temperature of the reactor to 100°C. When the temperature in the reactor reaches 50°C, add 300g of terephthalic acid, 143.3g of ethylene glycol, 75g of isosorbide, and hexanediol 7.58g and 80mg of catalyst antimony trioxide, 500mg of antioxidant [1010], and 100mg of triphenyl phosphate were put into the reaction kettle, and the rotation speed of the stirring paddle was set at 10r / min. During the stirring process, carry out nitrogen replacement at the same time (inflate nitrogen to 150Kpa, keep the pressure for 10s, slowly release the pressure to normal pressure, usually replace 3-5 times). Then, when the temperature in the reactor rose to 100°C, the rotation speed of the stirring paddle was gradually increased, finally to 50r / min. Under the condition of stirring paddle rotation speed 50r / min, firstly fill nitrogen to 150Kpa, then raise the set temperature of the reactor from 100°C to 230°C, and carry out pressure esteri...

Embodiment 3

[0035] First, preheat the reaction kettle, and set the preheating temperature of the reaction kettle to 100°C. When the temperature in the reaction kettle reaches 50°C, 300g of terephthalic acid, 143.3g of ethylene glycol, 72.3g of isosorbide, and Put alcohol 9.8g, catalyst antimony trioxide 80mg, antioxidant [1010] 500mg, triphenyl phosphate 100mg into the reaction kettle, and set the speed of the stirring paddle at 10r / min. During the stirring process, carry out nitrogen replacement at the same time (inflate nitrogen to 150Kpa, keep the pressure for 10s, slowly release the pressure to normal pressure, usually replace 3-5 times). Then, when the temperature in the reactor rose to 100°C, the rotation speed of the stirring paddle was gradually increased, finally to 50r / min. Under the condition of stirring blade rotation speed of 50Hz, nitrogen gas is firstly charged to 150Kpa, and then the set temperature of the reactor is increased from 100°C to 230°C, and the raw materials are...

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Abstract

The invention discloses degradable modified polyester with high heat resistance and good mechanical properties and a preparation method thereof, and belongs to the technical field of polyester material preparation. The structural general formula of the degradable modified polyester is as follows. The preparation method of the degradable modified polyester comprises the steps of raw material pulping, esterification under pressure, condensation polymerization, granulation, drying and the like. By introducing bio-based rigid dihydric alcohol and straight-chain aliphatic bio-based dihydric alcoholand regulating the ratio of the bio-based rigid dihydric alcohol to the straight-chain aliphatic bio-based dihydric alcohol, the heat resistance of the polyester is improved, the mechanical propertyis considered, and the polyester also has degradability.

Description

technical field [0001] The invention belongs to the technical field of polyester material preparation, in particular to a modified degradable polyester with high heat resistance and good mechanical properties and a preparation method thereof. Background technique [0002] In 1953, DuPont was the first to realize the industrialization of polyethylene terephthalate (PET). With the maturity of polyester technology, PET materials are low in price and superior in performance. PET became the first commercialized thermoplastic polyester. In 2017, the global PET production capacity was 93 million tons per year, becoming one of the top five engineering plastics and widely used in various fields. However, there are still deficiencies in the performance of PET polyester materials. First, the glass transition temperature of PET polyester is low (Tg = 70 ° C), which limits the use of high-temperature films, plug-in connectors, kitchen utensils, high-temperature resistant tableware, food...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): C08G63/672C08G63/78C08G63/86
CPCC08G63/672C08G63/78C08G63/866
Inventor 段海峰张晏铭林英杰魏忠林曹军刚梁大鹏
Owner JILIN UNIV
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