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High-performance polylactic acid-based thermoplastic material as well as preparation method and application thereof

A thermoplastic material, polylactic acid-based technology, applied in the field of high-performance polylactic acid-based thermoplastic materials and their preparation, can solve the problems of high brittleness, poor temperature resistance and difficulty of polylactic acid, and achieve enhanced toughness and thermal stability, high temperature resistance Good performance and improved compatibility

Inactive Publication Date: 2021-12-31
宁波昌亚新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polylactic acid itself has relatively large defects, such as short molecular chains and high molecular weight rigidity. Conventionally prepared polylactic acid products are prone to brittle fracture when stretched, especially when stretched at high speed, and their elongation at break is less than 10%. , therefore, it is of great significance to study the toughening of polylactic acid
[0004] Polylactic acid has poor temperature resistance. The heat distortion temperature of non-annealed PLA is usually lower than 60 degrees. It has high brittleness and is not easy to process and shape, which causes great difficulties in actual production and application; traditional polylactic acid is generally hard, brittle, and insufficient in strength. , the defect that its mechanical strength is difficult to take into account

Method used

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  • High-performance polylactic acid-based thermoplastic material as well as preparation method and application thereof
  • High-performance polylactic acid-based thermoplastic material as well as preparation method and application thereof
  • High-performance polylactic acid-based thermoplastic material as well as preparation method and application thereof

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preparation example Construction

[0044] A kind of preparation method of high-performance polylactic acid base thermoplastic material, such as figure 1 As shown, the method includes the following steps:

[0045]S1. Mix polylactic acid, polypropylene and catalyst in proportion and react to obtain modified polylactic acid;

[0046] S2. The crystallinity of modified polylactic acid can reach 40%, and the heat distortion temperature can be increased to above 110;

[0047] S3. Mix and react the modified polylactic acid, polyimide, antioxidant, flame retardant and polyurethane in proportion to obtain a polylactic acid-based material;

[0048] In the examples of the present application, the toughness of polylactic acid is greatly improved by modifying polylactic acid. Because polylactic acid is a semi-crystalline polyester, the glass transition temperature is high, although it has a certain hardness, but the toughness is poor; while the polymer synthesized with polypropylene and polyurethane has a lower glass trans...

Embodiment 1

[0053] This implementation regulation discloses a high-performance polylactic acid-based thermoplastic material. The components of the thermoplastic material include 50 parts of polylactic acid, 5 parts of polypropylene, 0.5 parts of catalyst, 5 parts of polyimide, 0.1 part of antioxidant, 2 parts Part polyurethane, 0.5 part inorganic filler, 0.1 part flame retardant and 0.5 part crosslinking agent. The molar ratio of alumina and titania in the catalyst is 1:1. The polyimide is a polyimide containing an asymmetric indole structure, wherein the general chemical formula is:

[0054]

[0055] N is 6.

[0056] A preparation method of polylactic acid-based thermoplastic polyurethane, comprising the steps of:

[0057] Take polylactic acid, polypropylene and catalyst in proportion and mix them evenly in the reactor, heat the reactor to 130-180°C and react for 1-6 hours to obtain modified polylactic acid;

[0058] Take the modified polylactic acid, polyimide, antioxidant, flame ...

Embodiment 2

[0061] This embodiment discloses a high-performance polylactic acid-based thermoplastic material. The components of the thermoplastic material include 100 parts of polylactic acid, 25 parts of polypropylene, 6 catalysts, 25 parts of polyimide, 0.5 parts of antioxidant, 10 Parts of polyurethane, 6 parts of inorganic filler, 20 parts of flame retardant and 3 parts of crosslinking agent. The molar ratio of alumina and titania in the catalyst is 1:1.

[0062] A preparation method of polylactic acid-based thermoplastic polyurethane, comprising the steps of:

[0063] Take polylactic acid, polypropylene and catalyst in proportion and mix them evenly in the reactor, heat the reactor to 130-180°C and react for 1-6 hours to obtain modified polylactic acid;

[0064] Take the modified polylactic acid, polyimide, antioxidant, flame retardant and polyurethane and mix them uniformly in the reactor according to the proportion. The reactor is heated to 180-220°C and reacted for 3-6 hours to o...

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-performance polylactic acid-based thermoplastic material as well as a preparation method and application thereof. The thermoplastic material comprises the components: 50-100 parts of polylactic acid, 5-25 parts of polypropylene, 0.5-6 parts of a catalyst, 5-25 parts of polyimide, 0.1-0.5 part of an antioxidant, 2-10 parts of polyurethane, 0.5-6 parts of an inorganic filler, 0.1-20 parts of a flame retardant and 0.5-3 parts of a cross-linking agent. The prepared polyimide is good in high temperature resistance, and the thermal deformation temperature of polylactic acid is not lower than 110 DEG C; and compatibility can be well achieved without adding a compatilizer, crosslinking is formed after the cross-linking agent is introduced, polylactic acid can be grafted to a polylactic acid-based material, the compatibility of the polylactic acid-based material is further improved, toughness is good, and meanwhile the material has excellent mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and specifically refers to a high-performance polylactic acid-based thermoplastic material and its preparation method and application. Background technique [0002] Polylactic acid is an environmentally friendly plastic derived from biomass. It has the advantages of excellent biocompatibility, biodegradability and processability. It has the reputation of "green plastic" and has received more and more people's attention. focus on. However, polylactic acid still has problems such as brittleness, low toughness, and poor heat resistance, and the notched impact strength value is lower than 4KJ / m 2 , which severely limits the wide application of PLA materials in various fields. Therefore, the research on the modification of polylactic acid materials is increasingly becoming a hotspot, especially for various toughening modifications. [0003] Polylactic acid itself has relatively large def...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L23/12C08L79/08C08L75/04C08K3/22C08K3/04C08K5/14C08K5/101
CPCC08L67/04C08L2201/08C08K2003/2227C08K2003/2241C08K2201/011C08L23/12C08L79/08C08L75/04C08K3/22C08K3/042C08K3/041C08K5/14C08K5/101
Inventor 徐建海王美兰
Owner 宁波昌亚新材料科技股份有限公司
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