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Macromolecule nucleating agent used for polylactic acid and application method of macromolecule nucleating agent

An application method and polylactic acid technology, applied in the field of macromolecular nucleating agents, can solve problems such as difficult dispersion and incomplete compatibility of polylactic acid, and achieve the effects of good nucleation, improved mechanical properties and service performance.

Active Publication Date: 2017-06-13
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These nucleating agents are not completely compatible with polylactic acid, and it is difficult to disperse uniformly in the polylactic acid matrix

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Formula: polyvinyl formal, polymerization degree 500, dosage 0.3% (mass), balance polylactic acid.

[0030] Processing conditions: The macromolecular nucleating agent polyvinyl formal and polylactic acid resin in the formula are extruded and granulated with a twin-screw extruder, and the samples are obtained by injection molding with a mold temperature of 190°C.

[0031] Test results: The peak crystallization temperature of polylactic acid increased from 94.95°C to 102.69°C, and the crystallization temperature increased by 7.74°C. The crystallinity increased from 34.40% of pure polylactic acid to 49.84% after modification, and the tensile strength increased from 59.72MPa to 65.43MPa.

Embodiment 2

[0033] Formula: polyvinyl acetal, polymerization degree 500, dosage 0.5% (mass), balance polylactic acid.

[0034] Processing conditions: The macromolecular nucleating agent polyvinyl acetal and polylactic acid resin in the formula are extruded and granulated with a twin-screw extruder, and the samples are obtained by injection molding with a mold temperature of 190°C.

[0035] Test results: The peak crystallization temperature of polylactic acid increased from 94.95°C to 102.70°C, and the crystallization temperature increased by 7.75°C. The crystallinity increased from 34.40% of pure polylactic acid to 49.49% after modification, and the tensile strength increased from 59.72MPa to 62.44MPa.

Embodiment 3

[0037] Formula: polyvinyl acetal, polymerization degree 800, dosage 0.5% (mass), balance polylactic acid.

[0038] Processing conditions: The macromolecular nucleating agent polyvinyl acetal and polylactic acid resin in the formula are extruded and granulated by a twin-screw extruder, and the samples are obtained by injection molding with a mold temperature of 190°C.

[0039] Test results: The peak crystallization temperature of polylactic acid increased from 94.95°C to 104.02°C, and the crystallization temperature increased by 9.07°C. The crystallinity increased from 34.40% of pure polylactic acid to 52.42% after modification, and the tensile strength increased from 59.72MPa to 64.44MPa.

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Abstract

The invention relates to a macromolecule nucleating agent used for polylactic acid and an application method. The macromolecule nucleating agent is polyvinyl acetal, and polyvinyl acetal is mixed with polylactic acid by in-situ polymerization or in an addition manner in a processing process, so as to regulate the nucleating property of polyvinyl acetal. The macromolecule nucleating agent has no toxicity or corrosivity, is odorless and is dispersed easily. Polyvinyl acetal, which serves as the macromolecule nucleating agent, can enable the peak crystallization temperature of polylactic acid to be risen obviously, so that the crystallinity and the crystallization velocity are improved remarkably, the crystallization period is shortened obviously, and the mechanical property of resin is improved more obviously.

Description

technical field [0001] The invention relates to a macromolecular nucleating agent for polylactic acid and an application method thereof, in particular to a polyvinyl acetal macromolecular nucleating agent for polylactic acid and an application method thereof. Background technique [0002] Polylactic acid (PLA) has excellent biocompatibility, biodegradability, and non-toxicity. It has been industrialized and widely used in the field of packaging materials and biomedicine. Polylactic acid can be divided into poly-D-lactic acid (PDLA) and poly-L-lactic acid (PLLA) according to its optical activity. PDLA is a crystalline material, and PLLA is a semi-crystalline material. In the lactic acid obtained by biological fermentation, L-lactic acid accounts for about 95%, and D-lactic acid accounts for about 5%. The polylactic acid obtained by polymerization has a slow crystallization rate, a long processing and molding cycle, and poor heat resistance and mechanical properties of the pr...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L29/14C08F8/28C08F116/06
CPCC08F8/28C08L29/14C08L67/04C08F116/06
Inventor 杨彪王艳宁
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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