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Nucleating agent, its preparation method and application

A technology of nucleating agent and auxiliary agent, applied in the field of polylactic acid rapid crystallization nucleating agent and its preparation, can solve the problems of insignificant crystallization nucleation ability, poor compatibility of polylactic acid matrix, insufficient crystal nucleation, etc. The effect of avoiding the decline of material mechanical properties, excellent mechanical properties, and easy operation

Active Publication Date: 2012-05-30
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Recently, it has been reported that the interaction between bisamide compounds and polylactic acid molecules can be used to improve the crystallization nucleation ability of polylactic acid, so as to obtain a modified polylactic acid with fast crystallization rate and low production cost, but these compounds are based on alkanes One or two of the substituents such as radical, hydroxyl, nitro, amino, alkoxy are end groups, and the compatibility with the polylactic acid matrix is ​​poor, resulting in a decrease in the actual addition amount, insufficient formation of crystal nuclei, and improved crystallization. The nucleation ability is not obvious, and there are still technical defects

Method used

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  • Nucleating agent, its preparation method and application
  • Nucleating agent, its preparation method and application
  • Nucleating agent, its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0051]In a 250 mL round bottom flask, add 100 mL of absolute ethanol and 1.5 mL of 98% concentrated sulfuric acid by mass, stir and shake well, add 6 g (19.87 mmol) of abietic acid, and heat to a temperature of 180° C. for 6 hours under reflux. Excess ethanol was distilled off under reduced pressure, and 50 mL of 5% sodium bicarbonate aqueous solution was added to the residue, and then the product was extracted with ether. The organic phase was washed with water first, and then with anhydrous MgSO 4 After drying, diethyl ether was distilled off to obtain 5.6 g of ethyl abietate, with a yield of 85.1%.

[0052] In a 250mL round bottom flask, add 5.6g (16.97mmol) of ethyl rosinate, 17mL of hydrazine hydrate with a mass percentage of 80% and 60mL of absolute ethanol, heat to 110°C and reflux for 3 hours. After cooling at room temperature, the precipitated crystals were suction-filtered, and the solid was dried to obtain 4.7 g of abietic acid carboxylhydrazide with a yield of 89%...

Embodiment 2

[0059] 500 grams of polylactic acid (2002D, LD mixed type, Nature Works), 5 grams of dodecanedioic acid disabietic hydrazide nucleating agent and 15 grams of auxiliary agents (1010 2.5 grams of antioxidant, 12.5 grams of lubricant aluminum stearate) , pre-mixed in a high-speed mixer with a rotation speed of 1500 rpm and then melt-extruded to obtain pellets. The melt-extrusion temperature is 190-200°C, and the extrusion temperatures of the first to sixth stages are 190°C, 192°C, 194°C, 195°C, 198°C, 200°C. The obtained pellets were injected into standard specimens of rapidly crystallizing polylactic acid plastics to be tested for tensile strength, notched impact strength and half-crystallization time. The semi-crystallization time is 0.78 minutes, the tensile strength is 71Mpa, and the notched impact strength is 4.1KJ / m 2 .

Embodiment 3

[0061] 500 grams of polylactic acid (2002D, LD mixed type, Nature Works), 0.5 grams of dodecanedioic acid birosin hydrazide nucleating agent and 15 grams of auxiliary agents (1010 2.5 grams of antioxidant, 12.5 grams of lubricant aluminum stearate) , pre-mixed in a high-speed mixer with a rotation speed of 1500 rpm and then melt-extruded to obtain pellets. The melt-extrusion temperature is 190-200°C, and the extrusion temperatures of the first to sixth stages are 190°C, 192°C, 194°C, 195°C, 198°C, 200°C. The obtained pellets were injected into standard specimens of rapidly crystallizing polylactic acid plastics to be tested for tensile strength, notched impact strength and half-crystallization time. The semi-crystallization time is 23 minutes, the tensile strength is 65Mpa, and the notched impact strength is 3.5KJ / m 2 .

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Abstract

The invention discloses a nucleating agent, which is a compound with a structure as the formula I wherein n in the formula I is an integer from 2 to 18. The invention also discloses a preparation method of the nucleating agent. The preparation process of the nucleating agent is easy to control and the preparation method has high yield of the nucleating agent. The invention also discloses a rapidly crystallized polylactic acid plastic which is composed of 100 parts of polylactic acid, 0.1-5 parts of the nucleating agent and 0.5-10 parts of an auxiliary agent and has good degree of crystallization as well as fast crystallization rate. The invention also discloses a preparation method of the rapidly crystallized polylactic acid plastic. By adopting the method, the rapidly crystallized polylactic acid plastic can be directly formed by the injection molding without the two annealing technology. The method for preparing the rapidly crystallized polylactic acid plastic has strong operationality and low production cost, and is easy to operate and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of plastic materials, in particular to a polylactic acid rapid crystallization nucleating agent and its preparation method and application. Background technique [0002] Polylactic acid (PLA) is a kind of bio-based macromolecule degradable material widely used, which is prepared from renewable biological resources through chemical synthesis. PLA has excellent characteristics such as good mechanical properties, non-toxicity, low relative density, easy processing and molding at room temperature, fully biodegradable, and relatively low price. An active variety; it can be widely used in chemical industry, light industry, automobile manufacturing, home appliances, packaging materials, etc., and is constantly expanding new application fields. [0003] However, compared with general-purpose plastics such as conventional polyvinyl chloride (PVC) and polystyrene (PS), ordinary polylactic acid plastics have the disadvantages o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C243/36
Inventor 汤兆宾
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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