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High-heat-resistance modified PGA material and preparation method thereof

A highly heat-resistant and modified technology, applied in the field of PGA materials, which can solve problems such as low glass transition temperature

Inactive Publication Date: 2021-04-30
海南赛高新材料有限公司
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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-heat-resistance modified PGA material and preparation method thereof
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  • High-heat-resistance modified PGA material and preparation method thereof

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preparation example Construction

[0026] 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:

[0027] The polyglycolic acid resin, the filler, the castor oil mixture and the nucleating agent are mixed, extruded and granulated, and dried to obtain the modified PGA material.

[0028] 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.

[0029] In the present invention, the extrusion granulation adopts the method of water-stretching; the temperature of the water is 75°...

Embodiment 1

[0042] Composition according to raw material weight ratio: 1 part of nucleating agent, 80 parts of polyglycolic acid resin (PGA), 15 parts of filler, 30 parts of castor oil mixture; Described nucleating agent is inositol; Described filler is edible starch; Described The polyglycolic acid resin has a weight average molecular weight of 200,000 g / mol and a melting point of 220°C; the castor oil mixture is a mixture of castor oil and methanol with a purity of 90%, and the mass ratio of castor oil to methanol is 8:2.

[0043] 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 section is kept at about 230°C; the granulation is carried out by means of water-stretching, and the ...

Embodiment 2

[0049] Composition according to the weight ratio of raw materials: 0.5 parts of nucleating agent, 75 parts of polyglycolic acid resin (PGA), 10 parts of filler, 20 parts of castor oil mixture; Described nucleating agent is sebacic acid xylhydrazide; Described filler is Nano-montmorillonite; the weight-average molecular weight of the polyglycolic acid resin is 100,000 g / mol, and the melting point is 230°C; the castor oil mixture is a mixture of castor oil and methanol with a purity of 90%, and the mass ratio of castor oil and methanol is 8:2.

[0050] 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 section is kept at about 230°C; the granulation is carried out by mean...

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Abstract

The invention provides a high-heat-resistance 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, 10-30 parts of castor oil mixture and 0.5-1 part of nucleating agent; wherein the castor oil mixture is a mixture of castor oil with purity of 90% and methanol, and the mass ratio of castor oil to methanol is 7.5-8.5:2. The nucleating agent is selected from one or more of talcum powder, inositol and sebacic acid dimethylbenzene hydrazide; the filler is selected from one or more of nano montmorillonite, nano calcium carbonate and edible starch. The castor oil mixture, the nucleating agent and the filler are used for modifying the polyglycolic acid resin, so that the modified PGA material has high crystallization performance and can be used for preparing high-heat-resistance products.

Description

technical field [0001] The invention belongs to PGA materials, in particular to a high heat-resistant 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 temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L91/00C08L3/02C08K5/053C08K5/05C08K5/25C08K3/34
CPCC08L67/04C08L2201/08C08L2205/24C08L91/00C08L3/02C08K5/05C08K5/053C08K5/25C08K3/346
Inventor 陈烜刘伟邢青涛
Owner 海南赛高新材料有限公司
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