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Rapid crystallization polylactic acid composite material and preparation method thereof

A technology for crystallizing polylactic acid and composite materials, applied in the field of rapid crystallizing polylactic acid composite materials and their preparation, can solve problems such as slow polylactic acid crystallization rate, and achieve the effects of avoiding mechanical properties decline, improving mechanical properties, and accelerating crystallization rate.

Inactive Publication Date: 2009-09-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to overcome the defects of slow crystallization rate of polylactic acid in the prior art, and improve the crystallization rate of the polylactic acid matrix through the synergistic effect of organically modified natural minerals and crystallization accelerators, thereby obtaining a fast crystallization polylactic acid composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment one: the preparation of pure polylactic acid

[0034] 100 parts of vacuum-dried polylactic acid (weight-average molecular weight 19.5W) is mixed in a high-speed mixer at room temperature, extruded and granulated in a twin-screw extruder, and the extrusion temperature is 160-185 ° C, and then the composite material particles are injected into impact and tensile splines, to be tested. Its crystallization rate and mechanical properties are listed in Table 1.

Embodiment 2

[0035] Embodiment two: the preparation method of modified talcum powder / ethylene bis stearate amide / polylactic acid composite material

[0036] The preparation process of modified talcum powder: by weight, 15 parts of talcum powder, 84 parts of 95% ethanol aqueous solution, 1 part of silane coupling agent γ-glycidyl ether propyl trimethoxysilane, 0.1mol / L concentrated hydrochloric acid 0.03 parts were batched, stirred and mixed at 85°C, and then refluxed for 3 hours; filtered by suction, washed with deionized water, and dried at 105°C.

[0037] Vacuum-dried semi-crystalline poly L-lactic acid (weight average molecular weight 19.5W) 81 parts, modified talc powder 15 parts, ethylene bis stearate amide 3 parts, heat stabilizer maleic anhydride 0.2 parts, antioxidant 0.5 part of pentaerythritol ester of agent and 0.3 part of lubricant aluminum stearate were mixed in a high-speed blender at room temperature, extruded and granulated in a twin-screw extruder, and the extrusion temper...

Embodiment 3

[0038] Example 3: Preparation method of modified talcum powder / erucamide / polylactic acid composite material

[0039] The preparation process of modified talc powder: Mix 97 parts of talc powder with a particle size of less than 150 mesh and 3 parts of stearic acid in a high-speed mixer at a mixing temperature above 80°C for 40 minutes to obtain a dry-process modified talc powder.

[0040]Vacuum-dried semi-crystalline poly L-lactic acid (weight average molecular weight 19.5W) 86 parts, modified talc powder 10 parts, ethylene bis stearate amide 3 parts, heat stabilizer maleic anhydride 0.2 parts, antioxidant Agent tetraerythritol ester 0.5 part, lubricant aluminum stearate 0.3 are mixed in a high-speed mixer at room temperature, extruded and granulated in a twin-screw extruder, the extrusion temperature is 160-185 ° C, and then the composite material particles are injected into impact and tensile splines, to be tested. Its crystallization rate and mechanical properties are list...

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Abstract

The invention relates to a rapid crystallization polylactic acid composite material and a preparation technique thereof. The composite material comprises the following components in portion by weight: 59 to 98 portions of hypocrystalline poly-L-lactic acid, 1 to 40 portions of organic modified natural mineral, 1 to 20 portions of organic crystallization promoter, 0.1 to 1.0 portion of heat stabilizer, and 0.05 to 1.0 portion of lubricant. The sum of the mass percentage of the components is 100 percent. The preparation method for the material comprises the following steps: firstly preparing the modified natural mineral; then mixing the components according to the components of the composite material; agitating and mixing the raw materials evenly through a high-speed agitator; and adding the co-mixture into a twin screw extruder for extrusion and granulation. The method improves the crystallization rate of a polylactic acid matrix through the synergistic action of organized mineral and the crystallization promoter. Due to the addition of the organic crystallization promoter, the method strengthens the mechanical properties of the polylactic acid composite material, while simultaneously quickening the crystallization rate of polylactic acid, thereby avoiding the defect of greatly reducing the mechanical properties of the polylactic acid composite material caused by the addition of a single inorganic mineral nucleating agent. The price of adopted fillers is low; and the whole preparation method has a simple technological process and less consuming time of the technological process, and can realize the large-scale industrialized production.

Description

technical field [0001] The invention relates to a modified polylactic acid composite material and a preparation method thereof, in particular to a rapidly crystallizing polylactic acid composite material and a preparation method thereof. Background technique [0002] With the continuous development of the global economy, the consumption of petroleum resources by industry and agriculture continues to increase. At the same time, the amount of non-degradable plastics that rely on petroleum is increasing, causing serious white pollution and posing a huge challenge to the sustainable development of society. In my country, disposable plastic products that are difficult to recycle account for 20% of the total plastic in my country, and the plastic waste generated reaches 4 million tons every year. These plastic wastes have caused serious damage to the environment, resulting in reduced food production, the death of marine life, damage to hydroelectric power generation, and increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K13/02C08K9/04C08K3/34C08K3/30
Inventor 尹静波蔡艳华李孝秀施利毅丁鹏颜世峰王尹杰范寅清陈学思
Owner SHANGHAI UNIV
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