Preparation method of fast crystallization type polylactic acid composite material

A composite material, polylactic acid technology, applied in the field of preparation of rapid crystallization polylactic acid composite materials, can solve problems such as agglomeration and uneven dispersion of crystallization nucleating agents, lower molecular weight, severe thermal degradation, etc., to overcome low production efficiency, Effects of improving mechanical properties and heat resistance, and increasing crystallization speed

Inactive Publication Date: 2007-10-17
SHANGHAI TONG JIE LIANG BIOMATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional blending melt modification method has the disadvantages of agglomeration and uneven dispersion of crystallization nucleating agents in the polymer
Patent CN1366004 uses a twin-screw extruder to blend nucleating agents and polyester materials, which improves the dispersion of nucleating agents and increases the crystallization speed of polyester. However, for biodegradable materials, thermal degradation is severe during processing, which increases The crystallization speed also reduces the molecular weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 10Kg of L-lactic acid into a 30L reaction kettle, raise the temperature to 80°C, evacuate to 4000Pa inside the kettle, and dehydrate for 2 hours. Then add catalyst and nano-SiO 2 100g (1wt%), gradually heat up from 80°C to 150°C, control the pressure in the kettle to about 1000Pa, and polymerize for 10 hours. Then heat up to 165°C, and react for 15 hours under the pressure of 50Pa in the kettle to obtain polylactic acid with an intrinsic viscosity of 0.81dl / g, and the isothermal crystallization rate (1 / t) under the condition of 120°C 1 / 2 ) is 0.5441min -1 .

Embodiment 2

[0019] Add 10Kg of L-lactide into a 30L reactor, then add catalyst and nano-TiO 2 150g (1.5wt%), heated up to 160°C, and polymerized for 10 hours under the vacuum degree of less than 500Pa to obtain polylactic acid with an intrinsic viscosity of 1.2dl / g, and the isothermal crystallization rate (1 / t 1 / 2 ) is 0.3637min -1 .

Embodiment 3～7

[0021] nano-SiO 2 Dosage

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Abstract

The invention relates to a method for producing quick crystalline polylactide compound material by nano nucleating agent in situ belonging to the compound material field. The inventive method has the lactide or lactide as material, mixes the nano nucleating agent for a hot melting polycondensation to get polylactide/nano nucleating agent compound material. The crystal speed of the compound material is increased relative to the pure polylactide material. The method has a simple craft, a low cost, and gets the compound material with a good processing performance, mechanical property and a completely biodegradation which is applied in many fields.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a rapid crystallization type polylactic acid composite material. Background technique [0002] Polylactic acid (PLA) is a polymer with excellent biocompatibility, which is derived from renewable resource crops (such as corn). The most prominent advantage is biodegradability, which can be completely destroyed by microorganisms in nature after use. It degrades and finally produces carbon dioxide and water, which does not pollute the environment and is very beneficial to the protection of the environment. Polylactic acid has good mechanical properties, thermoplasticity, fiber formation, and high transparency. It is suitable for various processing methods such as blow molding and thermoplastic, and is easy to process. It is defined by the industry as the most promising new material in the new century. However, as an engineering plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/521C08G63/78C08K3/22C08K3/36C08K3/16
Inventor 张乃文王秦峰杨军任杰
Owner SHANGHAI TONG JIE LIANG BIOMATERIALS
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