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
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These nucleating agents are not completely compatible with polylactic aci

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap