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Modified PGA material compatibilized by adopting intercalation structure and preparation method thereof

A layer structure and modification technology, which is applied in the field of modified PGA materials with intercalation structure and its preparation, can solve the problems of short repeating units, high melting point and high hardness of PGA materials

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 short repeating unit of the PGA material itself, the weak chain movement ability and the high ester group density, the PGA material has a high melting point and high hardness, and the processing rheological properties are greatly affected.

Method used

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  • Modified PGA material compatibilized by adopting intercalation structure and preparation method thereof
  • Modified PGA material compatibilized by adopting intercalation structure and preparation method thereof
  • Modified PGA material compatibilized by adopting intercalation structure and preparation method thereof

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preparation example Construction

[0025] The raw materials for the preparation of the modified PGA material provided by the present invention include 3 to 5 parts of plasticizer; the plasticizer is a mixture of polyvinyl alcohol and ethylene glycol, the molecular weight of polyvinyl alcohol is 500 to 800 g / mol, and the degree of alcoholysis is 88 %~95%. The mass ratio of polyvinyl alcohol and ethylene glycol is preferably 1:0.9-1.1, more preferably 1:1. Polyvinyl alcohol needs to control the molecular weight and degree of alcoholysis. The low molecular weight cannot achieve the plasticizing effect, and the friction between the PGA segments is relatively large. Polyvinyl alcohol with too large molecular weight will affect the phase size of PGA blends, which is also unfavorable to processing. The alcoholysis degree of 88% is mainly to improve the compatibility between the plasticizer itself and the PGA material. In a specific embodiment, the degree of alcoholysis of the polyvinyl alcohol used is 88%, and the m...

Embodiment 1

[0045] According to the weight ratio of raw materials: 5 parts of plasticizer, 80 parts of polyglycolic acid (PGA) with a molecular weight of 300,000, and 30 parts of organic nano-montmorillonite;

[0046]The plasticizer is obtained by mixing polyvinyl alcohol with a molecular weight of 800 and industrial grade ethylene glycol with an alcoholysis degree of 88%, and drying at 65°C for 6 hours, and mixing with a high-speed mixer for 30 minutes. blended materials;

[0047] The above-mentioned materials are extruded by twin-screw, and the raw materials are first mixed with a high-speed mixer for 15 minutes, and the obtained mixture is dried for 14 hours at a relative humidity of 25% and a temperature of 25-30°C, and the weight loss moisture content is between 1.5-2%. Then put it into the twin-screw extruder for granulation; the length-to-diameter ratio of the twin-screw extruder must be at least 1:55, while the temperature of the feeding section is kept at about 170°C, the tempera...

Embodiment 2

[0052] According to the weight ratio of raw materials: 3 parts of plasticizer, 75 parts of polyglycolic acid (PGA) with a molecular weight of 500,000, 20 parts of organic nano-montmorillonite;

[0053] The plasticizer is obtained by mixing polyvinyl alcohol with a molecular weight of 800 and industrial grade ethylene glycol with an alcoholysis degree of 95%, and drying at 65°C for 6 hours, and mixing with a high-speed mixer for 30 minutes. blended materials;

[0054] The above-mentioned materials are extruded by twin-screw, and the raw materials are first mixed with a high-speed mixer for 15 minutes, and the obtained mixture is dried for 14 hours at a relative humidity of 25% and a temperature of 25-30°C, and the weight loss moisture content is between 1.5-2%. Then put it into the twin-screw extruder for granulation; the aspect ratio of the twin-screw extruder must be at least 1:55, while the temperature of the feeding section is kept at about 170°C, the temperature of the mix...

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Abstract

The invention provides a modified PGA material compatibilized by adopting an intercalation structure and a preparation method thereof. The modified PGA material is prepared from the following raw materials in parts by weight: 3-5 parts of a plasticizer, 70-80 parts of polyglycolic acid and 10-30 parts of organic nano montmorillonite, wherein the molecular weight of the polyglycolic acid is 300,000 to 500,000; and the plasticizer is a mixture of polyvinyl alcohol and ethylene glycol, the molecular weight of polyvinyl alcohol is 500-800g / mol, and the alcoholysis degree is 88%-95%. The polyglycolic acid is modified by adopting specific types of plasticizers and organic nano montmorillonite, so that the polyglycolic acid has a relatively low melting point and relatively high processing rheological property. The PGA material also has good compatibility with other materials.

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 an intercalation structure for compatibilization 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. From the perspective of polymer chemical structure, the ideal fully biodegradable plastics are mainly degradable aliphatic polyesters, which have completely decomposable ester groups in their chemical structure. These fully degradable polyesters have the characteristics of microbial degradation and water degradation, are non-toxic and harmless, and the final decomposition products are carbon dioxide and water. They are environment...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L29/04C08K5/053C08K9/04C08K3/34
CPCC08K2201/011C08L67/04C08L29/04C08K5/053C08K9/04C08K3/346
Inventor 陈烜刘伟邢青涛
Owner 海南赛高新材料有限公司
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