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High-crystallinity modified PGA material and preparation method thereof

A high crystallinity, modified technology, applied in the field of PGA materials, can solve the problem of low glass transition temperature

Active 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

[0003] However, due to the high melting point of the PGA material itself, the melting point exceeds 200 ° C, but its glass transition temperature is low, which makes its heat resistance temperature can be further improved

Method used

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  • High-crystallinity modified PGA material and preparation method thereof
  • High-crystallinity modified PGA material and preparation method thereof
  • High-crystallinity modified PGA material and preparation method thereof

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preparation example Construction

[0032] The present invention provides a kind of preparation method of the highly crystalline modified PGA material described in above-mentioned technical scheme, comprises the following steps:

[0033] The polyglycolic acid resin, the filler, the plasticizer and the nucleating agent are mixed, extruded and granulated, and dried to obtain the modified PGA material.

[0034] In the present invention, the temperature of the feeding section in the extrusion granulation process is preferably 120-140°C, more preferably 130°C; the temperature of the mixing section is preferably 210-230°C, more preferably 220°C; the temperature of the extrusion section Preferably it is 220-240 degreeC, More preferably, it is 230 degreeC. The invention adopts a twin-screw extruder for extrusion granulation, and the aspect ratio of the extruder is at least 1:75.

[0035] In the present invention, the extrusion granulation adopts the method of water-stretching; the temperature of the water is 75°C-80°C....

Embodiment 1

[0048] Composition according to raw material weight ratio: 0.5 part of nucleating agent, 80 parts of polyglycolic acid resin (PGA), 15 parts of filler, 4.5 parts of plasticizer; Described nucleator is inositol; Described filler is edible starch; Described The weight-average molecular weight of the polyglycolic acid resin is 200,000 g / mol, and the melting point is 220°C; the plasticizer is mixed with polyvinyl alcohol and glycerol at a mass ratio of 1:2, dried at 75°C for 6 hours, and mixed 30min, obtain plasticizer, the molecular weight of described polyvinyl alcohol is 500g / mol, and alcoholysis degree is 99%;

[0049] First mix the above raw materials with a high-speed mixer for 1 hour, and then put them into twin-screw extruders for granulation; the length-to-diameter ratio of the twin-screw extruder must be at least 1:75, while the temperature of the feeding section is kept at about 130°C, and the temperature of the mixing section is 220°C, the temperature of the extrusion ...

Embodiment 2

[0055] Composition according to raw material weight ratio: 1 part of nucleating agent, 75 parts of polyglycolic acid resin (PGA), 15 parts of filler, 9 parts of plasticizer; Described nucleating agent is sebacic acid xylhydrazide; Described filler is Nanometer montmorillonite; the weight average molecular weight of the polyglycolic acid resin is 100,000 g / mol, and the melting point is 230 ° C; the plasticizer is after mixing polyvinyl alcohol and glycerin according to the mass ratio of 1:2.2, After drying at 80°C for 6 hours, mixing for 25 minutes to obtain a plasticizer, the polyvinyl alcohol has a molecular weight of 500 g / mol and a degree of alcoholysis of 95%;

[0056] First mix the above raw materials with a high-speed mixer for 1 hour, and then put them into twin-screw extruders for granulation; the length-to-diameter ratio of the twin-screw extruder must be at least 1:75, while the temperature of the feeding section is kept at about 130°C, and the temperature of the mixi...

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Abstract

The invention provides a high-crystallinity modified PGA material and a preparation method thereof. The modified PGA material is prepared from the following raw materials in parts by weight: 70-80 parts of polyglycolic acid resin, 5-15 parts of filler, 4-25 parts of plasticizer and 0.5-1 part of nucleating agent. The plasticizer is a mixture of polyvinyl alcohol and glycerol in a mass ratio of 1:(1.8-2.3), the molecular weight of polyvinyl alcohol is 300-500g / mol, and the alcoholysis degree is greater than or equal to 98%; the nucleating agent is selected from one or more of talcum powder, inositol and sebacic acid dimethylphenyl hydrazide; and the filler is selected from one or more of nano montmorillonite, nano calcium carbonate and edible starch. The polyglycolic acid resin is modified by adopting the plasticizer, the nucleating agent and the filler, so that the modified PGA material has relatively high crystallization property and can be used for preparing a high-heat-resistance product. The Vicat softening temperature is 205 to 210 DEG C; the semi-crystallization time is 5-15 seconds; and the relative crystallinity is 45-47%.

Description

technical field [0001] The invention belongs to PGA materials, in particular to a highly crystalline modified PGA material and a preparation method thereof. Background technique [0002] PGA (polyglycolic acid), also known as polyglycolide, has the fastest degradation rate among aliphatic polyester materials due to the shortest repeating unit in its molecular structure. At the same time, its low molecular weight product is an ideal complete microbial degradation inducer. [0003] However, due to the high melting point of the PGA material itself, the melting point exceeds 200 ° C, but its glass transition temperature is low, which makes its heat resistance temperature can be further improved. As we all know, the heat-resistant temperature of polymer materials is restricted by the glass transition temperature and melting point. The heat-resistant temperature of highly crystalline polymers is closer to the melting point, while the softening point and glass transition temperatur...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L29/04C08L3/02C08K5/053C08K5/25C08K3/34
CPCC08K3/34C08K5/053C08L3/02C08K5/25C08L29/04C08L67/04
Inventor 邢青涛黎坛王俊峰赵洁
Owner HAINAN SHINER IND
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