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Natural polymer / degradable polymer composite material and preparation thereof

A technology of natural macromolecules and degraded polymers, applied in the field of degradable macromolecular composite materials and their preparation, can solve the problems of limited reaction efficiency and compatibilization effect, and achieves the advantages of large-scale, good processing performance and low price. Effect

Inactive Publication Date: 2009-07-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of toluene diisocyanate, the compatibility between soybean protein and polycaprolactone is improved. However, in this method, soybean protein exists in powder state without plasticization during processing, and polycaprolactone is in the form of melting. Obviously, during the extrusion process, the reaction between the two is a heterogeneous reaction, and only a small amount of soybean protein may participate in the reaction. Therefore, the reaction efficiency and compatibilization effect are very limited, and the performance of the composite material is natural. will not improve much

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Premix polybutylene adipate and pyromellitic anhydride in a molar ratio of 1:1, react at 150°C for 20 minutes, then cool to room temperature to obtain an active degradable polymer, which is broken into granules and keep it airtight for later use. Weigh 50 grams of crushed material, 570 grams of starch, and 380 grams of glycerin and pre-mix them in a high-speed mixer for 10 minutes, then pass through a twin-screw extruder, and react and extrude to obtain a natural polymer / degradable polymer composite material. The conditions are: the temperature from the feed inlet to the outlet is 90°C, 110°C, 130°C, 130°C, 110°C and 100°C in sequence, and the residence time of the material in the screw is 2 minutes.

[0029] Put the composite material in a flat vulcanizing machine at 10MPa and 130°C for 5 minutes, then cool to room temperature and take out the sheet. The measured tensile strength of the material was 7.3 MPa, the elongation at break was 200%, and the contact angle was ...

Embodiment 2

[0031] Premix polycaprolactone diol and bisphenol S epoxy resin with a molecular weight of 500 in a molar ratio of 1:1.3, react at 100°C for 90 minutes, and then cool to room temperature to obtain an active degradable polymer, which is broken into Granular matter and keep it airtight for later use. Weigh 300 grams of crushed material, 490 grams of kafirin, and 140 grams of glycerin in a high-speed mixer for 10 minutes, and then pass through a twin-screw extruder for reaction extrusion to obtain a natural polymer / degradable polymer composite material , The extrusion conditions are: the temperature from the feed inlet to the outlet is 90°C, 110°C, 130°C, 130°C, 110°C and 100°C, and the residence time of the material in the screw is 5 minutes.

[0032] The composite material was injection molded into dumbbell-shaped standard splines at 130°C. The measured tensile strength of the material was 15.2 MPa, the elongation at break was 150%, and the contact angle was 85°.

Embodiment 3

[0034] Premix polydecyl adipate diol and hexamethylene diisocyanate at a molar ratio of 1:1.3, react at 150°C for 5 minutes, then cool to room temperature to obtain an active degradable polymer, crush It is granular and kept airtight for later use. Weigh 300 grams of crushed material, 490 grams of soybean protein, 140 grams of glycerin, and 70 grams of water in a high-speed mixer for 10 minutes, and then pass through a twin-screw extruder for reactive extrusion to obtain natural polymers / degradable polymers For composite materials, the extrusion conditions are as follows: the temperature from the feed inlet to the outlet is 90°C, 110°C, 130°C, 130°C, 110°C and 100°C, and the residence time of the material in the screw is 1 minute.

[0035] Put the composite material in a flat vulcanizing machine at 10MPa and 130°C for 5 minutes, then cool to room temperature and take out the sheet. The measured tensile strength of the material was 19.5 MPa, the elongation at break was 110%, a...

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Abstract

The invention discloses a natural polymer / degradable polymer composite material, comprising: firstly, the degradable polymer is pre-mixed with an active material and then an active degradable polymer is prepared for reserve after reaction for 5-120 minutes at 100-180 DEG C; after the natural polymer is pre-mixed with a plasticizer, at the temperature of 80-180 DEG C, a thermoplastic natural polymer is prepared after 1-15 minutes of mixing by a screw extruder; finally, after the prepared thermoplastic natural polymer is mixed with the active degradable polymer according to the mass ratio of 5:95-95:5, at the temperature of 80-160 DEG C, the composite material is obtained by the reaction and extrusion of the screw extruder within 1-15 minutes, or obtained by extrusion on the same condition after the prepared thermoplastic natural polymer and the natural polymer are directly mixed with the plasticizer. The components of the composite material provided by the invention have excellent compatibility and superior mechanical property, processing performance and water resistance performance, thus having very wide application prospect; and the preparation method is simple and belongs to a continuous mode of production, thus being conducive to large-scale and industrialized production.

Description

technical field [0001] The invention belongs to the technical field of degradable polymer composite materials and their preparation, in particular to a natural polymer / degradable polymer composite material prepared from natural polymers, plasticizers and active degradable polymers and its Preparation. Background technique [0002] Although traditional polymer materials derived from the petrochemical industry have played an extremely important role in the survival and development of human society, in recent years, such traditional polymer materials are facing two severe challenges. On the one hand, With the gradual depletion of petroleum resources, the cost of traditional polymer materials is getting higher and higher. On the other hand, traditional petroleum-based polymer materials are difficult to degrade. After being used and discarded, they have caused huge pollution to the environment on which human beings depend. [0003] The most effective way to solve these two probl...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L5/08C08L89/00C08L67/00C08L69/00C08L71/00C08K5/053C08K5/21C08K5/20
Inventor 王玉忠曾建兵李以东李陶汪秀丽杨科珂
Owner SICHUAN UNIV
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