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Polylactic acid composite material and application thereof

A composite material, polylactic acid technology, applied in the direction of biological packaging, etc., can solve the problems of reducing the transparency of the material and restricting the application, and achieve the effect of maintaining transparency, good transparency, and improving heat resistance.

Active Publication Date: 2018-05-08
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, while the above-mentioned patents increase the heat-resistant temperature of the polylactic acid composite material, the transparency of the material is greatly reduced, which greatly limits its application in the field of baby products such as feeding bottles.

Method used

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  • Polylactic acid composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] Preparation of polylactic acid:

[0039] PLA A1

[0040] Take 20mol of commercially available L-lactide as a raw material, use toluene as an organic solution, add 0.03mol of stannous octoate as a catalyst, add it to a 20L stainless steel reaction kettle, reduce the pressure to a high vacuum of 0.085MPa, and slowly heat to 145°C , and stirred for 1 h to completely dissolve the lactide. Extract the toluene vapor generated by heating, maintain a vacuum of 0.085 MPa, and stop the reaction after 12 hours of constant temperature reaction at 145°C; after the pressure of the reaction kettle is normal pressure, add ethyl acetate to dissolve the solid in the reaction kettle, pour it into a container and air-dry it. After the solvent ethyl acetate was completely volatilized, it was placed in a vacuum desiccator for subsequent use.

[0041]The polydispersity index P=1.76 of the prepared polylactic acid was determined by GPC, and two decimal places were reserved.

[0042] PLA A2 ...

Embodiment 1-8 and comparative example 1-6

[0070] According to the formula in Table 1, mix polylactic acid, talc powder and plasticizer evenly, put them into a twin-screw extruder, extrude and pelletize at 160°C-190°C, and obtain polylactic acid composite materials. The performance test data are shown in the table 1.

[0071] Table 1 Proportion and performance test results of polylactic acid composite materials (parts by weight)

[0072]

[0073] It can be seen from the results in Table 1 that the embodiment of the present invention uses polylactic acid with a polydispersity index P satisfying the following relationship: 1.55≤P≤2.02 as the matrix, and adds a specific range of particle size D （50） Meet: 1μm≤D （50） Talc powder ≤2.6μm is used as a nucleating agent, and a plasticizer with a specific molecular weight is selected as a crystallization accelerator. The light transmittance T of the prepared polylactic acid is ≥ 80%, the haze H is ≤ 40%; the heat distortion temperature HDT ≥ At 90°C, the polylactic acid com...

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Abstract

The invention discloses a polylactic acid composite material and application thereof. the polylactic acid composite material comprises components of (A) 89-98 parts by weight of polylactic acid; (B) 1-4 parts by weight of talcum powder; and (C) 1-7 parts by weight of a plasticizer; wherein in the component (A), the polydispersity index P of the polylactic acid satisfies the following relationship:1.55=<P<=2.02; in the component (B), the diameter D(50) of the talcum powder satisfies: 1[mu]m=<D(50)<=2.6[mu]m; and in the component (C), the relative molecular weight M of the plasticizer satisfies: 180=<M<=670. According to an unexpected research discovery of the invention, the polylactic acid with the polydispersity index P satisfying the following relationship: 1.55=<P<=2.02 is used as a matrix, the ultrafine talcum powder with a specific range of content is added as a nucleating agent, and the plasticizer a specific molecular weight is selected as a crystallization accelerant, so that the prepared polylactic acid composite material has a light transmittance T>=80%, a haze H<=40%, and a heat distortion temperature HDT>=90DEG C, and has obviously improved heat resistance and transparency.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and in particular relates to a polylactic acid composite material and its application. Background technique [0002] Polylactic acid resin is a polymer material obtained by chemical synthesis or biosynthesis with lactic acid as a monomer. Its raw materials are mainly corn, potatoes, etc., and the price is low. At the same time, because its raw materials are natural crops, there are very few carbon emissions. From the perspective of safety, polylactic acid is non-toxic and non-irritating, has excellent transparency and biodegradability, and is easily decomposed and metabolized by various microorganisms in nature or enzymes in animals and plants, and finally forms carbon dioxide and water, thus to a certain extent It reduces white pollution and is an ideal green polymer material. [0003] In addition to being biodegradable, products made of polylactic acid have good biocompat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L71/02C08K3/34C08K5/11
CPCC08K3/34C08K5/11C08L67/04C08L2201/08C08L2201/10C08L2205/24C08K2201/003C08L71/02C08K3/346C08G63/08C08K5/0016
Inventor 卢昌利袁志敏蔡彤旻黄险波曾祥斌焦建熊凯杨晖麦开锦董学腾何柿华
Owner KINGFA SCI & TECH CO LTD
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