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Preparation method of polylactic acid composite material

A composite material and polylactic acid technology, applied in the field of preparation of polylactic acid composite materials, can solve the problems of slow polylactic acid crystallization rate, product development limitation, unfavorable high-efficiency production, etc., and achieve comprehensive performance optimization, production cost reduction, and comprehensive energy consumption. reduced effect

Active Publication Date: 2016-11-09
安徽华哲虹彩科技有限公司
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AI Technical Summary

Problems solved by technology

[0003] However, due to the slow crystallization rate of polylactic acid, the development of its products has been greatly restricted, especially in some high-temperature applications, such as cups, soup bowls, home appliances, automotive parts and other engineering plastic applications.
Although polylactic acid is a crystalline polymer material, since the heat distortion temperature of polylactic acid is only about 58°C, which is far lower than that of general-purpose plastic polypropylene, it hardly crystallizes during the actual molding process. Partially crystallized polylactic acid is obtained, but this prolongs the molding cycle and is not conducive to efficient production

Method used

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  • Preparation method of polylactic acid composite material
  • Preparation method of polylactic acid composite material

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preparation example Construction

[0025] The invention provides a kind of preparation method of polylactic acid composite material, comprises the steps:

[0026] Step 1. Weigh 100 parts of polylactic acid, 0.5-2 parts of heat stabilizer, 0.5-3 parts of nucleating agent, 0.2-0.5 parts of crystallization accelerator, and 1-3 parts of organic activated nano-inorganic filler.

[0027] Specifically, the polylactic acid is L-type polylactic acid or D-type polylactic acid.

[0028] Specifically, the heat stabilizer is macromolecule hindered amine and phosphate compound, copper halide series heat stabilizer, triethyl phosphate, or lithium stearate.

[0029] Specifically, the nucleating agent is sodium phosphate, benzoate, or sorbitol.

[0030] Specifically, the accelerator is fatty amide, oleamide, or phthalamide.

[0031] Specifically, the organic activated nanofiller is nano talcum powder, nano montmorillonite, or nano calcium carbonate treated with an organic activator, and the organic activator is specifically a...

Embodiment 1

[0041] Take 50kg of undried polylactic acid and 0.5kg of triethyl phosphate, mix them evenly, and throw them into the feeder of the co-rotating twin-screw extruder, turn on the heated co-rotating twin-screw extruder, the melt pressure Control between 1 ~ 5MPa, the vacuum degree is controlled at about 0.05MPa, add 0.5kg4,6-di-tert-butylphenyl phosphate sodium and 0.1kg oleamide into the first side feeder, in the twin-screw shear After fully mixing, plasticizing and dispersing under the action, enter the second metering section, add 0.5kg of organically activated organic talcum powder of about 10,000 meshes into the second side feeder, and fully mix, melt, and Dispersion, so that the ordered structure of the nano-layered organic activated talc powder is completely destroyed, and it is evenly dispersed in the polymer matrix to obtain a polylactic acid rice composite material with transparency, high temperature resistance, and high mechanical properties.

Embodiment 2

[0043] Take 100kg undried polylactic acid, 0.5kgThemstab TM After the S220 is mixed evenly, put it into the feeder of the co-rotating twin-screw extruder, turn on the heated co-rotating twin-screw extruder, control the melt pressure between 1 and 5 MPa, and control the vacuum at 0.08 At about MPa, add 1kg dimer metaphosphate and 0.2kg stearamide into the first side feeder, fully mix, plasticize and disperse under the shearing action of the twin-screw, and then enter the second metering section. Add 1 kg of organic activated montmorillonite of about 10,000 meshes into the side feeder, fully mix, melt and disperse in the compression section again, so that the ordered structure of nano-layered organic activated montmorillonite is completely destroyed and uniform Dispersed in the polymer matrix, a polylactic acid composite material with transparency, high temperature resistance and high mechanical properties can be obtained.

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Abstract

The invention provides a preparation method of a polylactic acid composite material. A plurality of side feeding devices are added to an intermeshing co-rotating twin screw extruder, different raw material components are added from the plurality of feeding devices arranged along the material flow direction on a material cylinder of the intermeshing co-rotating twin screw extruder so as to realize control of heatproof reaction degree of polylactic acid, thus optimizing comprehensive performance of the material. At the same time, because of the use of continuous process and equipment, in the material preparation process, the comprehensive energy consumption is reduced, the production cost is greatly decreased, and pre-drying is unnecessary for polylactic acid before preparation, the moisture content of polylactic acid can be stably controlled within 0.02%, the influence caused by thermal decomposition and hydrolysis of moisture on polylactic acid in the material cylinder to molecular weight decrease can be restrained, and the product quality is ensured.

Description

technical field [0001] The invention relates to a preparation method of a polylactic acid composite material, in particular to a method for preparing a heat-resistant polylactic acid composite material through a melt extrusion intercalation process without pre-drying. Background technique [0002] Polylactic acid (Poly Lactic Acid, PLA) is a new type of polyester material obtained by polymerization based on lactic acid. After use, polylactic acid can be completely degraded by microorganisms in nature to generate carbon dioxide and water without polluting the environment. It has good biodegradable properties; and polylactic acid has good transparency, high mechanical strength and appropriate barrier properties, and is the first choice as a bio-based material for commercial use. [0003] However, due to the slow crystallization rate of polylactic acid, the development of its products has been greatly restricted, especially in some high-temperature applications, such as cups, s...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K13/06C08K9/04C08K3/34C08K3/26C08K5/521C08K5/20C08K5/098C08K3/32C08K5/52B29C47/40B29C47/60
CPCB29C48/402B29C48/535C08K3/26C08K3/32C08K3/34C08K3/346C08K5/098C08K5/20C08K5/52C08K5/521C08K9/04C08K13/06C08K2003/265C08K2003/327C08K2201/011C08L2201/08C08L2201/10C08L2205/24C08L67/04
Inventor 李积迁陈永弟杨宏陈晓江李建平
Owner 安徽华哲虹彩科技有限公司
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