PLA-PBAT blending modified degradable material

A technology of degradable materials and blending modification, applied in the field of polymer materials, can solve the problems of low thermal stability, high cost, slow crystallization, etc., and achieve the effects of improved mechanical properties, good degradation performance, and good compatibility

Pending Publication Date: 2021-02-26
SUZHOU RUNJIA ENGINEER PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polylactic acid also has a fatal weakness, that is, its lack of toughness, brittle material texture, slow crystallization, narrow thermal processing range, low thermal stability, and high cost. Therefore, adipic acid-terephthalic acid is often used in this field. Formic acid-butylene glycol copolymer (PBAT) is used as a composite material of polylactic acid, which in turn strengthens the toughness of polylactic acid

Method used

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  • PLA-PBAT blending modified degradable material
  • PLA-PBAT blending modified degradable material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]A PLA-PBAT blending modified degradable material, the preparation method of the material includes:

[0029]S1: Use a desiccant dryer to dry PLA, PBAT, and polyglycidyl methacrylate grafted starch to avoid hydrolysis during the preparation process; according to the weight ratio, the ratio of PLA:PBAT is 60:40, The amount of glycidyl acrylate grafted starch is 1.0% of the total weight of PLA and PBAT.

[0030]S2: Put the PLA, PBAT and polyglycidyl methacrylate grafted starch powder obtained by drying in S1 into a mixer and mix well;

[0031]S3: The uniform raw materials obtained in S2 are added to the twin-screw extruder for melting and mixing, the temperature is 185°C, and the speed is 50 r / min;

[0032]S4: The molten material obtained in S3 is added to the granulation machine to obtain the PLA-PBAT blend modified degradable material.

Embodiment 2

[0034]A PLA-PBAT blending modified degradable material, the preparation method of the material includes:

[0035]S1: Use a desiccant dryer to dry PLA, PBAT, and polyglycidyl methacrylate grafted starch to avoid hydrolysis during the preparation process; according to the weight ratio, the ratio of PLA:PBAT is 70:30, The amount of glycidyl acrylate grafted starch is 0.5% of the total weight of PLA and PBAT.

[0036]S2: Put the PLA, PBAT and polyglycidyl methacrylate grafted starch powder obtained by drying in S1 into a mixer and mix well;

[0037]S3: The uniform raw materials obtained in S2 are added to the twin-screw extruder for melting and mixing, the temperature is 190°C, and the speed is 50 r / min;

[0038]S4: The molten material obtained in S3 is added to the granulation machine to obtain the PLA-PBAT blend modified degradable material.

Embodiment 3

[0040]A PLA-PBAT blending modified degradable material, the preparation method of the material includes:

[0041]S1: Use a desiccant dryer to dry PLA, PBAT, and polyglycidyl methacrylate grafted starch to avoid hydrolysis during the preparation process; according to the weight ratio, the ratio of PLA:PBAT is 60:40, The amount of glycidyl acrylate grafted starch is 2.0% of the total weight of PLA and PBAT.

[0042]S2: Put the PLA, PBAT and polyglycidyl methacrylate grafted starch powder obtained by drying in S1 into a mixer and mix well;

[0043]S3: The uniform raw materials obtained in S2 are added to the twin-screw extruder for melting and mixing, the temperature is 190°C, and the speed is 50 r / min;

[0044]S4: The molten material obtained in S3 is added to the granulation machine to obtain the PLA-PBAT blend modified degradable material.

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Abstract

The invention provides a PLA-BAT blending modified degradable material. A modified starch is added into a PLA-BAT blending polymer, so that common modified starch is rich in epoxy groups, and the compatibility between PLA and PBAT is better due to the introduction of the epoxy groups. Through modification, the PLA-BAT blend has relatively good mechanical properties, and also has relatively good degradation properties at the same time. Furthermore, the polyglycidyl methacrylate is selected to graft the starch, the reaction between the polyglycidyl methacrylate and the starch is simple, besidesa small amount of necessary catalyst, other additional auxiliaries, toxic reagents or other organic solvents are not needed, and the reaction is green and closer to the concept of health. The invention provides a practical optional material in degradable materials, and the degradable material has certain application universality.

Description

Technical field[0001]The invention relates to the field of polymer materials, in particular to a PLA-PBAT blend modified degradable material.Background technique[0002]Polylactic acid (PLA) has attracted more and more attention in the field of materials because of its high mechanical strength, good mechanical processing properties, and excellent biocompatibility. However, polylactic acid still has a fatal weakness, that is, its toughness is insufficient, the material texture is relatively brittle, the crystallization is slow, the thermal processing range is narrow, the thermal stability is low, and the cost is high. Therefore, adipic acid-terephthalic acid is often used in this field. Formic acid-butanediol copolymer (PBAT) is used as a composite material of polylactic acid, which in turn strengthens the toughness of polylactic acid. Polylactic acid is also a degradable material, and PBAT is also a completely degradable aliphatic aromatic copolyester. Therefore, studying the degradab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08L51/02
CPCC08L67/04C08L2201/06C08L2205/08C08L2205/03C08L67/02C08L51/02
Inventor 汪理文翁永华郑帅李庆贵刘正军
Owner SUZHOU RUNJIA ENGINEER PLASTIC
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