Modified polylactic acid material under low irradiation dose and preparation method thereof

A polylactic acid material and low-irradiation technology, which is applied in the field of modified polylactic acid material and its preparation, can solve the problems of complex process route and difficulty in obtaining relative molecular weight PLA, and achieve increased molecular weight, improved mechanical properties, and increased radiation stability. Effect

Inactive Publication Date: 2010-06-16
上海新上化高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ring-opening polymerization method can obtain PLA with a relatively high molecular weight, the process route is relatively complicated; the direct polymerization method has a simple process route, but it is difficult to obtain PLA with a relatively high molecular weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Polylactic acid (molecular weight: 12,500) was dried in a vacuum oven at 70°C for 12 hours (to a moisture content of less than 100ppm) and then taken out. Using TAIC as a sensitizer, weigh 1,000g of the above-mentioned polylactic acid and 31g of TAIC and mix them, then The mixture was poured into a reaction kettle, reacted at a reaction temperature of 110° C. for 0.5 hour, and then poured out and cooled.

[0027] The polylactic acid mixture was irradiated with an electron beam at a dose of 25 kGy.

[0028] Using the method in the literature (Xing Yunjie, Yuan Maoquan, Mao Huiping, etc. Preparation of new biodegradable materials-hydrogen-bonded PLLA [J]. Shanghai Chemical Industry, 2006, 31(3): 33-34.) for detection: the obtained polylactic acid material The molecular weight of the product is 180,000; it is tested with reference to the method specified in the GB / T 1040.1-2006 standard: the tensile strength and elongation at break are increased by 53%.

Embodiment 2

[0030] Polylactic acid (molecular weight: 5,000) was dried in a vacuum oven at 70°C for 12 hours (to a moisture content of less than 100ppm) and then quickly taken out. Using BDDA and HDDA as sensitizers, weigh 2,000g of PLA, 75g of BDDA and 30g of HDDA respectively. After mixing, the mixture is then fed into a reactive twin-screw extruder, and the extrusion temperature is controlled at 110°C. The polylactic acid mixture was irradiated with an electron beam at a dose of 10 kGy.

[0031] Using the method in the literature (Xing Yunjie, Yuan Maoquan, Mao Huiping, etc. Preparation of new biodegradable materials-hydrogen-bonded PLLA [J]. Shanghai Chemical Industry, 2006, 31(3): 33-34.) for detection: the obtained polylactic acid material The molecular weight is 100,000;

[0032] Tested with reference to the method specified in the GB / T 1040.1-2006 standard: the tensile strength and elongation at break have increased by 62%.

Embodiment 3

[0034] Polylactic acid (molecular weight 3,8000) was dried in a vacuum oven at 70°C for 12 hours (to a moisture content of less than 100ppm) and then quickly taken out. Using ETMPTA as a sensitizer, 2,000g of PLA and 41g of ETMPTA were weighed and mixed, and then The mixture was fed into a reactive twin-screw extruder, and the extrusion temperature was controlled at 140°C. Use in air atmosphere and room temperature 60 The Co-γ-ray source irradiates with a dose rate of 100Gy / min and an absorbed radiation dose of 5kGy.

[0035] The molecular weight of the obtained polylactic acid material is 260,000, and the tensile strength and elongation at break are increased by 50%.

[0036] The detection method is the same as in Example 1.

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Abstract

The invention discloses a modified polylactic acid material under a low irradiation dose and a preparation method thereof, wherein the preparation method comprises the following steps of: 1. extruding a polylactic acid resin raw material, a sensitizing agent and other auxiliary agents in an extruding machine, or smelting and mixing in a reaction kettle to obtain a mixture, wherein the molecular weight of the polylactic acid resin raw material is 5, 000-50, 000; and 2. then irradiating a compound in step 1 by using an electron beam or a gamma-ray to obtain the modified polylactic acid material. In the invention, the polylactic acid obtained from the modified polylactic acid material under the low irradiation dose can be used as food and medical materials, the irradiation stability of the polylactic acid material obtained after modification is increased, the molecular weight of the modified polylactic acid obtained through the invention is greatly increased and is 100, 000-350, 000, the mechanical performance is also greatly improved, and the modified polylactic acid material can be used as the safe and environment-friendly food and medical materials.

Description

technical field [0001] The invention relates to a modified polylactic acid material and a preparation method thereof. Background technique [0002] In recent years, due to the increasingly serious environmental pollution caused by waste plastics, degradable plastics have attracted more and more attention. Among them, polylactic acid (PLA) has the advantages of excellent biodegradability, non-toxicity, non-irritation, good biocompatibility, etc., and can be widely used as biomedical and environment-friendly materials. Before PLA is used as food, hygiene and medical materials, it needs to be sterilized to ensure that its thermodynamic properties are not greatly damaged. Under the action of high-energy rays, PLA undergoes ionizing radiation effects, causing changes in its structure and properties to varying degrees, thereby affecting its performance. [0003] In the existing technology, the research on this kind of materials at home and abroad mainly focuses on the high radia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08F2/46C08L51/08
Inventor 徐永卫杨玲玲汪峰钟伟勤
Owner 上海新上化高分子材料有限公司
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