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Polylactic acid composition and molding product thereof

A composition and polylactic acid technology, applied in the field of polymer materials, can solve the problems of poor thermal stability of carbodiimide, excessive use of carbodiimide, harmful odor to human health, etc., so as to improve processability and reduce melting. The effect of increasing body viscosity and good hydrolysis resistance

Inactive Publication Date: 2010-06-30
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, as in the above three inventions, simply using carbodiimide compounds to end-cap polylactic acid has the following disadvantages: first, in order to improve the hydrolysis resistance, excessive use of carbodiimide will cause the product It brings a burden on the cost, and also leads to an increase in the viscosity of the melt during processing, which brings difficulties to processing such as injection molding, foaming, and blow molding. Moreover, carbodiimide has poor thermal stability and produces odors that are harmful to human health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 90 parts of polylactic acid resin (4032D, Nature works company, weight average molecular weight 18~22w), 10 parts of plasticizer (tributyl citrate) total amount 500g and the KH that accounts for both weight 0.05% 2 PO 4 , carbodiimide (stabaxol 1LF, German Rheinland Chemicals, melting point 40-45°C) accounting for 1% by weight of the two and a crystallization nucleating agent (3988, Meride) accounting for 1% by weight of the two are blended, The screw extruder performs melt blending and extrusion, and the melt is granulated after being cooled by a water tank. The temperature of the feeding section of the extruder is 180°C, the second section is 190°C, and the remaining sections are 200°C. The particles are dried for 4 hours, and then analyzed Molecular weight changes of the obtained pellets before and after the hydrolysis test. The results are shown in Table 1.

Embodiment 2

[0029] 90 parts of polylactic acid resin (4032D, Nature works company, weight average molecular weight 18~22w), plasticizer 10 parts (tributyl citrate) total amount 500g and the KH that accounted for both weight 2% 2 PO 4, carbodiimide (stabaxol 1LF, German Rheinland Chemicals, melting point 40-45°C) accounting for 1% by weight of the two and a crystallization nucleating agent (3988, Meride) accounting for 1% by weight of the two are blended, The screw extruder performs melt blending and extrusion, and the melt is granulated after being cooled by a water tank. The temperature of the feeding section of the extruder is 180°C, the second section is 190°C, and the remaining sections are 200°C. The particles are dried for 4 hours, and then analyzed Molecular weight changes of the obtained pellets before and after the hydrolysis test. The results are shown in Table 1.

Embodiment 3

[0031] 90 parts of polylactic acid resin (4032D, Nature works company, weight-average molecular weight 18~22w), 10 parts of plasticizer (tributyl citrate) total amount 500g and the KH that accounts for both weight 4% 2 PO 4 , carbodiimide (stabaxol 1LF, German Rheinland Chemicals, melting point 40-45°C) accounting for 1% by weight of the two and a crystallization nucleating agent (3988, Meride) accounting for 1% by weight of the two are blended, The screw extruder performs melt blending and extrusion, and the melt is granulated after being cooled by a water tank. The temperature of the feeding section of the extruder is 180°C, the second section is 190°C, and the remaining sections are 200°C. The particles are dried for 4 hours, and then analyzed Molecular weight changes of the obtained pellets before and after the hydrolysis test. The results are shown in Table 1.

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Abstract

The invention discloses a polylactic acid composition and a molding product thereof. The composition is mainly formed by the following components in part by weight: 100 parts of polylactic acid resin, 0.1 to 5 parts of an end blocking agent and 0.05 to 5 parts of a metal salt buffering agent. The composition and the molding product have high hydrolysis resistance; and compared with polylactic acid which is modified by purely using carbodiimide, the polylactic acid composition combines the buffering agent with the end blocking agent to obtain better hydrolysis resistance, can reduce the use amount of the carbodiimide, has the advantages of low cost and small toxicity, reduces the viscosity increase of a fusant caused by the carbodiimide, and thus improves the machinability of the polymer.

Description

technical field [0001] The invention belongs to the field of polymer materials and relates to a polylactic acid composition, in particular to a polylactic acid composition containing an end-capping agent and a buffer salt with excellent hydrolysis resistance and a product thereof. Background technique [0002] Polylactic acid is a polymer obtained by polymerizing lactic acid as the main raw material. The raw material source is sufficient and can be regenerated. The production process of polylactic acid is non-polluting, and the product can be biodegraded to realize the cycle in nature, so it is an ideal green polymer material. [0003] However, PLA materials cannot sufficiently maintain the physical properties of the material due to the hydrolytic degradation of polymer chains when exposed to high temperature and high humidity conditions for a long time. It is very important and necessary to improve the hydrolysis resistance of the polylactic acid composition to adapt to th...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K5/29C08K3/32C08K5/1515C08K5/353C08K5/357C08K5/3412C08K5/098
Inventor 赖峥峥刘博夏天河野俊司
Owner TORAY FIBER RES INST(CHINA) CO LTD
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