Organic nucleating agent for rapidly crystallizing polylactic acid and rapidly-crystallized polylactic acid resin of organic nucleating agent

An organic nucleating agent, polylactic acid technology, applied in the field of polylactic acid functional additives, can solve problems such as poor compatibility and easy agglomeration of inorganic particles, and achieve the effects of strong processing performance, accelerated crystallization rate, and simple process flow

Inactive Publication Date: 2011-09-07
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The second object of the present invention is to address the defects of poor compatibility between inorganic nucleating agents and polylactic acid matrix and the easy agglomeration of inorganic particles, and utilize the advantages of good compatibility between organic nucleating agents and polylactic acid and the ability to evenly disperse into polylactic acid matrix , exists as the crystal nucleus of polylactic acid during the crystallization process, and promotes the growth of polylactic acid crystals, so that the nucleating effect of the organic nucleating agent can be fully exerted

Method used

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  • Organic nucleating agent for rapidly crystallizing polylactic acid and rapidly-crystallized polylactic acid resin of organic nucleating agent
  • Organic nucleating agent for rapidly crystallizing polylactic acid and rapidly-crystallized polylactic acid resin of organic nucleating agent
  • Organic nucleating agent for rapidly crystallizing polylactic acid and rapidly-crystallized polylactic acid resin of organic nucleating agent

Examples

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Effect test

Embodiment 1

[0039] Embodiment one: the preparation of pure polylactic acid

[0040] 100 parts of vacuum-dried semi-crystalline poly-L-lactic acid (weight average molecular weight 19.5W) is extruded and granulated in a twin-screw extruder at an extrusion temperature of 160-185°C, and then the polylactic acid particles are injection-molded into impact, tensile Stretch spline, to be tested. Its crystallization rate and mechanical properties are listed in Table 1.

Embodiment 2

[0041] Example 2: Preparation of benzotriazole-modified polylactic acid

[0042] The benzotriazole with a mass purity of 98% and a mass water content of 45 ppm is ultrafinely pulverized to obtain an average particle size of 30 μm.

[0043] Vacuum-dried semi-crystalline poly-L-lactic acid (weight average molecular weight 19.5W) 98 parts, benzotriazole 0.5 part, heat stabilizer maleic anhydride 0.7 part, antioxidant tetraerythritol ester 0.3 part, lubricated 0.5 part of aluminum stearate is uniformly mixed in a high-speed mixer, extruded and granulated in a twin-screw extruder at an extrusion temperature of 160-185°C, and then the modified polylactic acid particles are injected into impact, tensile Spline, to be tested. Its crystallization rate and mechanical properties are listed in Table 1.

Embodiment 3

[0044] Example 3: Preparation of terephthalic acid dibenzohydrazide modified polylactic acid

[0045] The preparation method of terephthalic acid dibenzohydrazide: terephthalic acid and excess sulfur oxychloride were refluxed for 6 hours under the catalysis of dimethylformamide, and then rotary steamed to obtain terephthaloyl chloride; 2 Under protection, add terephthaloyl chloride dropwise to the dimethylformamide solution dissolved in benzoylhydrazine, react at 60 degrees for 2 hours, pour into water, filter with suction, and wash with deionized water and methanol respectively 3 times, and finally vacuum-dried at 65°C to obtain dibenzohydrazide terephthalate, melting point: 334°C, mass purity 97.5%, mass water content 40ppm, average particle size 25μm.

[0046] Vacuum-dried semi-crystalline poly L-lactic acid (weight average molecular weight 19.5W) 94 parts, terephthalic acid dibenzohydrazide 4.5 parts, thermal stabilizer maleic anhydride 0.4 parts, antioxidant tetraerythrit...

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Abstract

The invention relates to an organic nucleating agent for rapidly crystallizing polylactic acid. The organic nucleating agent is an N-H, O-H and S-H group based organic compound which interacts with a polylactic acid molecular chain to rapidly form a crystal nucleus during polylactic acid crystallization to promote the crystal growth and achieve the purpose of improving the polylactic acid crystallization rate. The organic nucleating agent can be well compatible with polylactic acid resin and can be uniformly dispersed in a polylactic acid matrix, thus the defects that an inorganic nucleating agent has poor compatibility with the polylactic acid resin and decreased meahanical properties, and the purpose of rapidly crystallizing the polylactic acid to form the crystal nucleus by adding a small amount of organic nucleating agent is achieved. The invention further relates to a technology and method for rapidly crystallizing polylactic acid by adding the organic nucleating agent. The organic nucleating agent has obvious nucleating effect and can be widely applied to the polylactic acid resin.

Description

technical field [0001] The invention relates to the technical field of polylactic acid functional additives, in particular to an organic nucleating agent for realizing rapid crystallization of polylactic acid and a polylactic acid resin thereof. Background technique [0002] With the advent of the era of biodegradable plastics, polylactic acid has established its position as the first variety in the field of biodegradable plastics in terms of research and development, production, and application. Polylactic acid is prepared from renewable plant resources such as corn, wheat, and cassava through chemical synthesis of lactic acid. Due to its renewable raw materials, green production process and biodegradability, it is the most potential biodegradable polymer material, and the carbon dioxide and water produced by its final degradation can be returned to nature and added to the plant In the process of photosynthesis, the carbon cycle on the earth is maintained in balance to mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/3475C08K5/25C08K5/3492C08K5/37C08L5/16
Inventor 尹静波蔡艳华范寅清余诸毅施利毅颜世峰陈学思
Owner SHANGHAI UNIV
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