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Degradation-type composite material and preparation method thereof

A technology of composite materials and initiators, which is applied in the field of composite materials, can solve the problems of PLA performance degradation, poor processing stability, and low elongation at break, and achieve good thermal stability, good mechanical properties, and good thermal stability.

Inactive Publication Date: 2008-09-17
JIANGSU QIONGHUA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high crystallinity of PLA and T g It is much higher than room temperature so that it has high strength and high rigidity, but the material is very brittle and the elongation at break is very low, only about 4%. Secondly, its toughness is very poor
Furthermore, the processing stability is poor, easy to degrade and hydrolyzed, especially the terminal carboxyl group of PLA can catalyze this degradation
The new carboxyl groups generated by degradation will further catalyze the degradation of PLA, such a vicious cycle will lead to a significant reduction in the performance of PLA

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Take each component according to the following formula A (parts by weight):

[0025] Polylactic acid 20 parts

[0026] Ecoflex 80 servings

[0027] Capping agent 5 parts

[0028] Processing aid 1.5 parts

[0029] Initiator 0.5 parts

[0030] 2. Preparation process:

[0031] After mixing the appropriate proportion of polylactic acid, Ecoflex, end-capping agent, initiator and processing aid in a mixer, plasticizing and extruding through a twin-screw extruder to obtain a composite material.

[0032] The specific operation method is as follows:

[0033] Dry the polymer for 2-6 hours before using the polymer, then mix the components with a mixer, cool and stir, and discharge at room temperature.

[0034] Plasticized extrusion was carried out in a twin-screw extruder. The temperature setting of the extruder is: feeding section 100-150°C, plasticizing section 150-180°C, extrusion section 150-180°C; screw speed: 200-300 rpm.

[0035] 3. Product performance:

[0036]...

Embodiment 2

[0039] 1. Take each component according to the following formula B (parts by weight):

[0040] 30 parts polylactic acid

[0041] Ecoflex 70 servings

[0042] Capping agent 5 parts

[0043] Processing aid 1.5 parts

[0044] Initiator 0.5 parts

[0045] 2. Preparation process:

[0046] Same as embodiment one.

[0047] 3. Product performance:

[0048] The tensile strength of the film made of the composite material is: 12.91MPa (transverse), 15.24MPa (longitudinal). Elongation at break: 305.54% (transverse), 451.53% (longitudinal).

[0049] As can be seen from the results of the examples, the polylactic acid / Ecoflex (butylene glycol-adipic acid-terephthalic acid) degradable composite material obtained by the present invention has far surpassed polylactic acid in its performance and has excellent mechanical properties And mechanical properties, as well as the advantages of degradability, film toughness, very good hand feeling, can be used as packaging materials and environm...

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Abstract

The invention provides a degraded composite material and a preparation method thereof, and relates to a degraded composite material. Poly lactic acid in an amount of 10 to 90 parts by weight, butanediol-adipic acid-terephthalic acid in an amount of 10 to 90 parts by weight, glycidyl methacrylate in an amount of 1 to 5 parts by weight, an initiator in an amount of 0.5 to 1 part by weight, and a processing accessory ingredient in an amount of 1 to 3 parts by weight are uniformly mixed in a mixing machine, and are plastified and extruded by a double screw extruder, thus getting the degraded composite material. The method disclosed by the invention is simple. The product can be produced easily with good stability, and has the advantages of excellent mechanical property, mechanical property, excellent degradability and so on. The tenacity and the hand feeling of a film made of the composite material are very excellent, and the composite material can be used as packaging material, environment-friendly material and so on.

Description

technical field [0001] The invention relates to a composite material, in particular to a polylactic acid / Ecoflex (butanediol-adipic acid-terephthalic acid) degradable composite material. Background technique [0002] Due to the massive consumption and waste of energy and resources generated by the rapidly expanding human activities in the late 20th century, environmental and resource issues on a global scale began to emerge. my country has also been transformed into a net importer of crude oil since 1993, and the import volume in 2004 has exceeded 100 million tons. In 2001, my country's output of organic synthetic polymer-related products reached 25 million tons, ranking second in the world. While these products bring convenience and comfort to our lives, the pressure they cause on energy, resources, and environmental issues is also very serious. In 2005, China's demand for plastic packaging materials reached 5 million tons, and if 30% of them were disposable plastic packa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08K5/14B29C47/92B29C48/40B29C48/92
CPCB29C47/92B29C48/92B29C2948/92704B29C48/40B29C48/9185B29C2948/9259B29C2948/92885B29C2948/92895
Inventor 李宏图王景清黄伟生夏琳
Owner JIANGSU QIONGHUA GRP CO LTD
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