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Polylactic acid modified material for food contact injection molding products and preparation method thereof

A modified material and food contact technology, applied in the field of polymer materials, can solve the problems of expensive, limited polylactic acid industrial application and large-scale development, and achieve the effect of simple and efficient cost and reduced production cost

Pending Publication Date: 2020-12-11
安徽丰原生物新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Expensive price severely limits the application and scale development of polylactic acid industry

Method used

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  • Polylactic acid modified material for food contact injection molding products and preparation method thereof
  • Polylactic acid modified material for food contact injection molding products and preparation method thereof
  • Polylactic acid modified material for food contact injection molding products and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] The preparation method of above each embodiment polylactic acid modified material comprises the following steps:

[0058] (1) Mix polylactic acid PLLA with a toughening agent and an auxiliary agent to obtain component A, and component A is extruded through the first twin-screw unit to obtain molten component A;

[0059] The molten component A is mixed with the inorganic mineral powder in the second twin-screw unit, and then extruded, cooled, and pelletized to obtain the polylactic acid modified granular material.

[0060] Among them, the first twin-screw unit is divided into 10 zones, and the temperature of each zone is 155-160°C, 160-165°C, 165-170°C, 170-175°C, 175-180°C, 175-180°C, 180-185°C ℃, 185~190℃, 190~195℃, 195~200℃;

[0061] The second twin-screw unit is divided into 10 zones, and the temperature of each zone is 195-200°C, 190-195°C, 185-190°C, 180-185°C, 175-180°C, 170-175°C, 175-180°C, 165~170℃, 160~165℃, 160~165℃.

[0062] Afterwards, the properties of ...

Embodiment 11

[0075] Example 11 The raw materials of polylactic acid were mixed at a weight ratio of PLLA:PDLA=60:40 to establish a blended stereosystem of PDLA / PLLA.

Embodiment 12

[0076] Embodiment 12 uses high-purity PDLA.

[0077] Afterwards, the properties of the prepared polylactic acid modified materials were tested. The polylactic acid modified granular material prepared in each example was made into a sample strip, and crystallized in the mold for 20 s in the preparation of the sample strip, and the mold temperature was 105°C. The test results are shown in Table 5.

[0078] table 5

[0079]

[0080] Compared with Example 4 in which L-polylactic acid (PLLA) was used alone, the performance data of Example 11 showed that the physical properties of the polylactic acid modified granular products prepared by the blended stereosystem of PDLA / PLLA were enhanced, and the impact strength Improve; the system has the characteristics of high crystallinity and high heat deformation resistance.

[0081] The performance test results of Example 11 and Example 12 also show that with the increase of PDLA content, the heat resistance of the product is greatly i...

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Abstract

The invention belongs to the technical field of high polymer materials, particularly discloses a polylactic acid modified material for manufacturing food contact injection molding products, and discloses a preparation method at the same time. The polylactic acid modified material is prepared from polylactic acid, inorganic mineral powder, a flexibilizer and an auxiliary agent. The preparation method comprises the following steps of: firstly, mixing polylactic acid, a flexibilizer and an auxiliary agent to obtain a component A, and extruding the component A through a double-screw unit to obtaina molten component A; and mixing the molten component A with inorganic mineral powder in the double-screw unit, and then carrying out extruding, cooling and pelletizing to obtain the polylactic acidmodified granular material. The polylactic acid toughening and heat-resisting modification method provided by the invention is simple, efficient and low in cost, and has important significance in marketization of injection molding products of polylactic acid.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polylactic acid modified material used for manufacturing food-contact injection molding products, and also to a preparation method thereof. Background technique [0002] Plastic products have the advantages of low cost and strong plasticity, and are widely used in the national economy. At present, plastics have been widely used in agriculture, industry, construction, packaging, national defense and people's daily life. Plastic has brought people a convenient and fast way of life, so people's dependence on plastic is increasing. However, the environmental problems caused by plastics are becoming more and more serious, because the current plastics are mainly petroleum-based plastics made of petroleum, which are non-renewable and can hardly be degraded in the environment. They can always exist in the environment, causing serious damage. Environmental pollution, ecologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08L91/00C08L33/02C08K3/34C08K5/11C08K5/544C08L23/08C08K3/30C08K5/12C08K5/10
CPCC08L67/04C08L2205/035C08L2205/02C08K2003/3045C08L2201/08C08L2201/06C08L67/02C08L91/00C08L33/02C08K3/34C08K5/11C08K5/544C08L23/0869C08L91/005C08K3/30C08K5/12C08K5/10
Inventor 冯杰张伟周廷保金齐卞士成
Owner 安徽丰原生物新材料有限公司
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