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Polyglycolide copolymer and preparation tehreof

A polyglycolide and copolymer technology, applied in the field of degradable copolymers and its preparation, can solve the problems of poor mechanical and mechanical properties

Pending Publication Date: 2021-03-09
PUJING CHEM IND SHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the heat resistance temperature has increased, the mechanical and mechanical properties are still poor

Method used

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  • Polyglycolide copolymer and preparation tehreof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: Polyglycolide (or polyglycolic acid (PGA))

[0055] Glycolide and 0.01 parts by weight of ring-opening polymerization catalyst tin dichloride dihydrate were mixed uniformly at 120° C. for 60 minutes in a prefabricated tank reactor in an amount of 0.01 parts by weight relative to the weight of glycolide.

[0056] The materials in the prefabricated tank reactor were introduced into the polymerization reactor, and reacted at 200° C. and an absolute pressure of 0.1 MPa for 300 minutes. The polymerization reactor is a plug flow reactor, which can be a static mixer, a twin screw device or a horizontal disc reactor.

[0057] The contents of the polymerization reactor were introduced into the optimized reactor at a mixing speed of 200 RPM at 220 °C and an absolute pressure of 50 Pa. The reaction time was 30 minutes. As a result, polyglycolide was produced.

Embodiment 2

[0058] Example 2: Characterization

[0059] 1. Weight average molecular weight and its distribution

[0060] The sample was dissolved in 5 mmol / L sodium trifluoroacetate in hexafluoroisopropanol solution to prepare a 0.05-0.3 wt% (mass fraction) solution. The solution was then filtered through a polytetrafluoroethylene filter with a pore size of 0.4 μm. 20 μL of the filtered solution was added to a gel permeation chromatography (GPC) injector to determine the molecular weight of the sample. Five standard molecular weights of methyl methacrylate with different molecular weights were used for molecular weight calibration.

[0061] 2. Tensile strength test

[0062]The tensile strength is tested according to GB / T1040 1-2006, and the tensile speed is 50mm / min.

[0063] 3. Melt index (MFR) test

[0064] The melt index (MFR) of the copolymer is tested as follows: 1) the copolymer is dried at 105° C. in a vacuum drying oven; 2) the test temperature of the test instrument is set t...

Embodiment 3

[0067] Example 3: Copolymer

[0068] Prepare polyglycolide (PGA), copolymer 1-6 and polylactic acid (PLA) as comparison with polyglycolide described in embodiment 1 and one or more additives, then according to embodiment 2 Characterized by the method described above. Table 1 shows the composition and properties of these copolymers.

[0069] PGA was pelletized at an extrusion temperature of 250°C by putting polyglycolide and 0.06wt% Irganox 168 and 0.03wt% Irganox MD-1025 additives based on the total weight of the copolymer into a twin-screw extruder And prepared. The pellets were dried at 120°C for 4 hours and molded into strips for testing using an injection molding machine at an injection temperature of 250°C and a molding temperature of 100°C. The test results are shown in Table 1.

[0070] Copolymer 1 puts polyglycolide and the Irganox 168 based on the total weight of copolymer 0.06wt%, the Irganox MD-1025 of 0.03wt% and the ADR4368 additive of 0.2wt% into the twin-scr...

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Abstract

Disclosed is a copolymer of polyglycolide and one or more additives. The copolymer may have a weight-average molecular weight(Mw) in the range of 10000-1000000 and a ratio of a weight-average molecular weight to a number-average molecular weight(Mw / Mn) in the range of 1.0 to 10.0. The copolymer may have a melt index(MFR) in the range of 0.1 to 1000g / 10min. The copolymer has good mechanical properties, thermal stability and hydrolytic stability. Also provided is a process for preparing the copolymer.

Description

technical field [0001] The invention provides a novel degradable copolymer with good mechanical properties, thermal stability and hydrolysis stability and a preparation method thereof. Background technique [0002] Traditional polymers, such as polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, etc., have been widely accepted and used in daily life. As a substitute for metals and biological materials, polymer materials have an advantage in price. By making corresponding composite materials, the mechanical properties of these materials are further enhanced, making them even more desirable. However, due to the difficulty of natural degradation and inconvenient recycling of traditional polymer materials, it is likely to cause serious pollution and harmful effects (CN107603171). [0003] In recent years, degradable polymers have gradually attracted people's attention, and polylactic acid (PLA) is one of them. Polylactic acid has a wide range ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G65/10
CPCC08G63/08C08L67/04C08G63/6852C08G63/912C08J3/12C08J2367/04C08L23/0884C08K5/25C08K5/526C08L63/04C08G63/785C08G63/823C08J3/203C08L2201/08C08L2203/30
Inventor 张欣舟
Owner PUJING CHEM IND SHA