Toughening polylactic acid resin composition

A technology of polylactic acid resin and composition, applied in the field of toughening polylactic acid resin composition, can solve problems such as reducing tensile strength, and achieve the effects of improving elongation at break, broad market prospect and simple equipment

Active Publication Date: 2013-02-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the above-mentioned blending modification method has improved the impact strength of polylactic acid, it has reduced its tensile strength.

Method used

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  • Toughening polylactic acid resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Add 1500mL of water, 2.5g of sodium pyrophosphate, 3.5g of glucose, 0.08g of ferrous sulfate, 0.7g of potassium hydroxide, 17mL of rosin soap, and 360g of polybutadiene latex into a three-necked flask in sequence, and blow in nitrogen. The temperature was raised to 70°C, and after stirring for 10 minutes, a polybutadiene mixed liquid was obtained, and then 228 g of methyl methacrylate, 12 g of glycidyl methacrylate, and 2.6 mL of cumene hydroperoxide were mixed and continuously added dropwise to the above In the polybutadiene mixed solution, continue to react for 1 h after the dropwise addition, and then add 1.5 grams of the mixture of antioxidant 1010 and antioxidant 168 with a mass ratio of 1:1, obtain a coagulated emulsion after half an hour, and place it in Dry at 60°C for 24 hours to obtain a toughening agent, which is denoted as MB-g-GMA-1. Wherein, the mass fraction of butadiene-styrene copolymer is 60%, and the mass fraction of butadiene and styrene is 70:30; Th...

Embodiment 2

[0050] 100g of polylactic acid with a number average molecular weight of 80,000 Daltons, 5g of the toughening agent MB-g-GMA-1 prepared in Example 1, and 0.5g of antioxidant 1010 and antioxidant with a mass ratio of 1:2 The mixture of 168 was mechanically blended to obtain a premix, and then the SHJ-20 twin-screw extruder was used to mix and prepare the polylactic acid resin composition. The rotation speed was set at 100 rpm for 5 minutes. The temperature of each section was set as As shown in Table 1, Table 1 shows the temperature setting of each section of the twin-screw extruder in the embodiment of the present invention.

[0051] The obtained toughened polylactic acid resin was tested for mechanical properties, and the results are shown in Table 2. Table 2 shows the performance test results of the toughened polylactic acid resin composition prepared in the embodiment of the present invention.

Embodiment 3

[0053] Combine 100g of polylactic acid with a number average molecular weight of 80,000 Daltons, 10g of toughening agent MB-g-GMA-1 prepared in Example 1, and 0.3g of antioxidant 1010 and antioxidant with a mass ratio of 1:2 The mixture of 168 was mechanically blended to obtain a premix, and then the SHJ-20 twin-screw extruder was used to mix and prepare the polylactic acid resin composition. The rotation speed was set at 100 rpm for 5 minutes. The temperature of each section was set as As shown in Table 1, Table 1 shows the temperature setting of each section of the twin-screw extruder in the embodiment of the present invention.

[0054] The obtained toughened polylactic acid resin was tested for mechanical properties, and the results are shown in Table 2. Table 2 shows the performance test results of the toughened polylactic acid resin composition prepared in the embodiment of the present invention.

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Abstract

The invention provides a toughening polylactic acid resin composition comprising 100 parts by weight of polylactic acid, 5-25 parts by weight of toughening agent and 0.1-1 part by weight of first antioxidant, wherein the toughening agent is a copolymer of a core-shell structure which takes butadiene-styrene copolymer as a core and takes epoxypropyl methacrylate compolymer as a shell. According to the toughening polylactic acid resin composition provided by the invention, the copolymer of the core-shell structure which takes butadiene-styrene copolymer as the core and takes epoxypropyl methacrylate compolymer as the shell is taken as the toughening agent to toughen polylactic acid, and the toughening agent can be used for effectively improving the breaking elongation, impact strength and tensile strength of the polylactic acid, so that the polylactic acid with good comprehensive performance is obtained. Mechanics performance testing results show that the impact strength of the toughening polylactic acid resin composition provided by the invention reaches up to 66.8KJ/m<2>, the breaking elongation is about 200% and the tensile strength reaches up to 56.4MPa.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a toughened polylactic acid resin composition. Background technique [0002] Polylactic acid (PLA), also known as polylactide, is polymerized from lactic acid fermented from plant starch. Its source of raw material is sufficient and renewable. The production process is pollution-free, and the product can be biodegraded to realize the cycle in nature. Therefore, polylactic acid is an ideal green polymer material. Polylactic acid has good thermal stability and good solvent resistance, and can be processed in various ways, such as extrusion, spinning, biaxial stretching, injection molding, and blow molding. Products made of polylactic acid are not only biodegradable, but also have good biocompatibility, gloss, transparency, feel and heat resistance, so they are widely used and can be used as packaging materials, fibers and nonwovens, etc. At present, it is mainly used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L47/00C08F236/10C08F220/14C08F220/32
Inventor 张会良郝艳平边俊甲孙树林梁宏玉韩常玉庄宇刚董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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