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Bio-degradable polyester and method for preparing same

A technology for biodegradable polyester and derivatives is applied in the field of biodegradable polyester and its preparation, and can solve the problems of low mechanical properties, low melting point, and the inability of biodegradable polyester resin materials to meet preparation requirements.

Active Publication Date: 2010-11-17
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction of isocyanurate can improve the temperature resistance of the material, the isocyanurate defined in the patent makes it difficult to control the reaction and has more gel points
[0011] So far, biodegradable polyester resin materials cannot meet the preparation requirements, especially for the performance and production requirements of membrane materials
Aliphatic polyester, even if it undergoes chain extension or branching treatment during the synthesis process, has a low melting point, insufficient heat resistance, and also has defects of sticking to the roll during processing
Linear aliphatic / aromatic copolyesters treated with diisocyanate chain extension are easier to process film materials than polyester materials without chain extension treatment, but the formed gel particles will interfere with the film processing process, especially when the cycle When the period becomes longer and the mechanical properties are lower

Method used

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  • Bio-degradable polyester and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Add 330kg of 1,5-pentanediol and 175kg of dimethyl terephthalate into the reactor, under the protection of nitrogen, raise the temperature to 185°C, add 319g of n-butyl titanate, and maintain the temperature in the reactor at 190°C, After reacting for 4 hours, 161 kg of azelaic acid was added and reacted at 200° C. for 4 hours.

[0073] Then, the temperature was raised to 210° C., and after reacting in a low vacuum (90 KPa) for 1 hour, 200 g of n-butyl titanate was added. After the temperature reaches 230°C, react for 30 minutes, then start to slowly raise the temperature to 245°C, gradually increase the vacuum degree, so that the pressure in the kettle reaches 1KPa, keep the temperature constant, and keep the pressure in the kettle below 80Pa, and react for 3.5 hours to obtain the product .

[0074] The relevant indicators of the product were obtained: molecular weight: Mn=38860, Mw=67500, viscosity 1.18dL / g, carboxyl end 50mol / t, melting point 113.8°C, 90-day degrada...

Embodiment 2

[0076] Add 300kg of 1,4-butanediol, 140kg of dimethyl terephthalate, and 640g of glycerin into the reactor, under the protection of nitrogen, raise the temperature to 170°C, add 350g of n-butyl titanate, and maintain the temperature in the reactor After reacting for 4 hours, add 210kg of adipic acid and react at 200°C for 4 hours.

[0077] Then, the temperature was raised to 210° C., and after reacting in a low vacuum (90 KPa) for 1 hour and 40 minutes, 200 g of n-butyl titanate was added. After the temperature reaches 230°C, react for 30 minutes, then start to slowly raise the temperature to 245°C, gradually increase the vacuum degree, so that the pressure in the kettle reaches 1KPa, keep the temperature constant, and keep the pressure in the kettle below 80Pa, and react for 3.5 hours to obtain the product .

[0078] The product-related indicators were obtained: molecular weight: Mn=56490, Mw=112850, viscosity 1.27dL / g, carboxyl-terminated group 75mol / t, melting point 124.0°...

Embodiment 3

[0080] Add 290kg of isosorbide, 170kg of dimethyl terephthalate, and 1200g of trimesic acid into the reaction kettle. Under the protection of nitrogen, heat up to 180°C, add 450g of n-butyl titanate, and maintain the temperature in the reaction kettle at After reacting for 4.5 hours at 200°C, add 170kg of succinic acid and react at 210°C for 4 hours. Add 2 kg of tris(2-hydroxyethyl)isocyanurate.

[0081] Then, the temperature was raised to 220° C., and after reacting in a low vacuum (90 KPa) for 1 hour, 200 g of n-butyl titanate was added. After the temperature reaches 230°C, react for 30 minutes, slowly raise the temperature to 245°C, gradually increase the vacuum degree to make the pressure in the kettle reach 1KPa, keep the temperature constant, keep the pressure in the kettle below 80Pa, and react for 3.5 hours to obtain the product.

[0082] The relevant indicators of the obtained product are: molecular weight Mn=49380, Mw=102170, viscosity 1.25dL / g, carboxyl terminal 64...

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Abstract

The invention relates to bio-degradable polyester and a method for preparing the same, and belongs to the technical field of bio-degradable copolyester products. The number-average molecular weight of the bio-degradable polyester material is 6,000 to 135,000g / mol, the molecular weight distribution is 1.2 to 6.5, and the crystallization temperature range is between 15 and 105 DEG C; the bio-degradable polyester overcomes defects existing in conventional products and can be used for producing film-forming materials, sheets and foam materials, the sticking characteristics are greatly changed in the machining process, and the appearance quality is higher; and after the heat resistance is improved, the novel polyester material can also be used in the machining process with a long cycle period, such as an injection machining process, and the bio-degradable aliphatic / aromatic polyester material provided by the invention possesses excellent mechanical properties.

Description

technical field [0001] The invention relates to a biodegradable polyester and a preparation method thereof, belonging to the technical field of biodegradable copolyester products. Background technique [0002] Biodegradable polymers are a class of polymer materials that can decompose into carbon dioxide and water after a certain time span under suitable environmental conditions. This degradation process is usually divided into two processes. First, the molecular weight of macromolecules becomes smaller after hydrolysis and light / oxygen degradation, and then they are further consumed by microorganisms. Such microorganisms may be bacteria, fungi, yeast, algae, etc. The international standard ISO14855 provides a biodegradation performance test method, which is a more authoritative test method in the biodegradation performance test method for plastic materials. Various countries and regions have defined their own testing and inspection standards for degradable plastics accordin...

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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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/78C08G63/18C08G63/19
Inventor 徐依斌苑仁旭蔡彤旻焦建夏世勇袁志敏
Owner KINGFA SCI & TECH CO LTD
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