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Modified PGA material with relatively long shelf life and preparation method thereof

A shelf life and modification technology, which is applied in the field of modified PGA materials and its preparation, can solve the problems of affecting product quality, high density of ester groups, and difficulty in controlling the degradation speed.

Pending Publication Date: 2021-04-20
HAINAN SHINER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the repeating unit of the PGA material itself is too short and the density of the ester group is too high, its degradation rate is difficult to control. After industrial production, the shelf life is often very short, and various problems often occur in the process of consumer use, seriously affecting the product. quality

Method used

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  • Modified PGA material with relatively long shelf life and preparation method thereof
  • Modified PGA material with relatively long shelf life and preparation method thereof
  • Modified PGA material with relatively long shelf life and preparation method thereof

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preparation example Construction

[0024] The raw materials for the preparation of the modified PGA material provided by the present invention include 0.2 to 0.5 parts of a chain extender; the chain extender is a mixture of an epoxy chain extender and dibenzoylhydrazide sebacic acid; The mass ratio of chain agent to dibenzoylhydrazide sebacic acid is preferably 1:0.95-1.05, more preferably 1:1. In a specific embodiment, the amount of the chain extender is 0.3 part or 0.5 part. The epoxy equivalent of the epoxy chain extender is Epoxy equivalent weight = 285g / mol, molecular weight = 6800g / mol; or Epoxy equivalent weight = 185 g / mol, molecular weight = 3800 g / mol. Sebacic acid dibenzohydrazide is added as an additive to promote material crystallization, which can work together with ADR to improve the shelf life and mechanical properties of PGA.

[0025] The raw materials for preparing the modified PGA material provided by the present invention include 70-80 parts of polyglycolic acid; in a specific embodiment...

Embodiment 1

[0044] Composition according to the weight ratio of raw materials: 0.3 parts of chain extender, 70 parts of polyglycolic acid (PGA), 25 parts of filler, 4.7 parts of antiblocking agent; the chain extender is epoxy chain extender and decane The mixture of diacid dibenzohydrazide: wherein, the epoxy chain extender is 4370s, epoxy equivalent=185g / mol, molecular weight=3800g / mol, BASF company.

[0045] The filler is edible starch; the opening agent has a specific surface area of ​​180m 2 / g of nano silicon dioxide, pH value is 4, water content is 1.5%; the molecular weight of the polyglycolic acid is 200,000 g / mol, the melting point is 220°C, and the specific gravity is 1.2g / cm 3 ;

[0046] The twin-screw extrusion process is adopted, and the raw materials are first mixed with a high-speed mixer for 5 minutes, and then put into the twin-screw for granulation. The aspect ratio of the twin-screw extruder is 1:35, while the temperature of the feeding section is kept at 170°C, the...

Embodiment 2

[0052] Composition according to the weight ratio of raw materials: 0.5 parts of chain extender, 80 parts of polyglycolic acid (PGA), 15 parts of filler, 5 parts of antiblocking agent; the chain extender is epoxy chain extender and decane The mixture of diacid dibenzohydrazide: wherein, the epoxy chain extender is Epoxy equivalent=285g / mol, molecular weight=6800g / mol, BASF company.

[0053] The filler is organic montmorillonite; the anti-blocking agent has a specific surface area of ​​150m 2 / g of nano-silica, the pH value is 4.2, and the water content is 1.5%; the molecular weight of the polyglycolic acid is 200,000 g / mol, the melting point is 220 ° C, and the specific gravity is 1.2 g / cm 3 ;

[0054] The twin-screw extrusion process is adopted, and the raw materials are first mixed with a high-speed mixer for 5 minutes, and then put into the twin-screw for granulation. The aspect ratio of the twin-screw extruder is 1:35, while the temperature of the feeding section is kep...

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Abstract

The invention provides a modified PGA material with long shelf life and a preparation method thereof. The modified PGA material is prepared from, by weight, 0.2-0.5 part of a chain extender, 70-80 parts of polyglycolic acid, 15-30 parts of filler and 1-5 parts of an anti-blocking agent, wherein the molecular weight of the polyglycolic acid is 100,000-300,000 g / mol, and the melting point of the polyglycolic acid is 200-220 DEG C; the anti-blocking agent is nano silicon dioxide with the specific surface area of less than 200 m<2> / g, the pH value is 3.8-4.3, and the water content is lower than 2%; and the chain extender is a mixture of an epoxy chain extender and sebacic acid dibenzoyl hydrazine. According to the invention, the specific polyglycolic acid is modified by adopting the chain extender and the anti-blocking agent, so that the modified PGA material has a relatively long shelf life; the tensile property and the stiffness are better; the shelf life can reach up to 6 months; the tensile strength is 31 to 33 MPa; the elongation at break is 9.5 to 10 percent; and the stiffness is 1.5 to 2 N.m.

Description

technical field [0001] The invention belongs to the technical field of PGA modified materials, and in particular relates to a modified PGA material with a relatively high shelf life and a preparation method thereof. Background technique [0002] PGA (polyglycolic acid), also known as polyglycolide, is a fully biodegradable polymer with the shortest segment structure known so far. Due to the shortest repeating unit in its molecular structure, it is the fastest degradation rate among aliphatic polyester materials, and it can achieve complete and rapid biodegradation even in seawater. [0003] However, everything has their two sides. Because the repeating unit of the PGA material itself is too short and the density of the ester group is too high, its degradation rate is difficult to control. After industrial production, the shelf life is often very short, and various problems often occur in the process of consumer use, seriously affecting the product. quality. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08K7/26C08K5/1515C08K5/25
Inventor 邢青涛黎坛王俊峰赵洁
Owner HAINAN SHINER IND
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