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Transparent heat-resistant fully-degradable component polylactic acid composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of transparent heat-resistant fully degradable component polylactic acid composite material and its preparation, can solve the problems of low molecular chain flexibility, limited product application, limited effect of improving interface compatibility HDT, etc. , to achieve the effect of improving transparency, heat resistance, toughness and transparency, and improving interface compatibility

Pending Publication Date: 2021-09-03
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is mainly realized by adding heat-resistant polymers such as polycarbonate (PC), polymethyl methacrylate (PMMA), PS, etc. to the PLA matrix. These heat-resistant polymers have wide sources, low cost, and flexible molecular chains. In addition to the characteristics of low solubility and almost no crystallization, it also shows the outstanding advantages of easy blending and modification due to its wide thermal processing window, but it is not biodegradable
[0005] Using heterogeneous nucleation to induce epigenetic crystallization on the surface of PLA heat-resistant polymers to form an interface crystal structure can increase the heat-resistant temperature of the interface layer. However, most of the crystal structures reported so far are randomly distributed in the matrix phase and dispersed. In the phase, there is a lack of designability, and the improvement effect on interface compatibility and HDT is limited
[0006] The patent with the publication number CN108752888B discloses a heat-resistant PLA composition and its preparation method. This patent uses a composition formed of PLA resin, starch graft copolymer and nucleating agent, although it can improve the degradability and Heat resistance, but starch is a granular substance, which has poor dispersion with the PLA matrix, and the improvement of heat resistance is limited, and the product formed after adding starch is opaque, which greatly limits the application of the product
[0007] The patent with the publication number CN106916422A discloses a preparation method of a highly transparent heat-resistant polylactic acid-based composite material. The patent uses polylactic acid, transparent resin and a nucleating agent to form a composite material, although it can improve the transparency of polylactic acid products and Heat resistance, but the transparent resin is not degradable and the nucleating agent is difficult to disperse evenly in the polylactic acid resin, which makes its degradation poor and heat resistance is limited

Method used

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  • Transparent heat-resistant fully-degradable component polylactic acid composite material and preparation method thereof

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preparation example Construction

[0036] Second, the present invention provides a method for preparing a transparent heat-resistant fully degradable polylactic acid composite material, comprising the following steps:

[0037] S1 drying polylactic acid and high molecular weight polylactic acid, standby;

[0038] S2 High-molecular-weight polylactic acid and β-nucleating agent are sequentially pre-mixed-melt-blended, extruded and granulated, and then dried to obtain nucleated masterbatches;

[0039] The S3 nucleating masterbatch and polylactic acid are sequentially pre-mixed-melt-blended, extruded and granulated, and then dried to obtain a polylactic acid composite material.

[0040] In the present invention, in S1, the drying temperature is 60-80° C., and the drying time is 4-8 hours.

[0041] In the present invention, in S2, the temperature of melt blending is 160-180°C.

[0042] In the present invention, in S3, the temperature of melt blending is 155-175°C.

[0043] In the present invention, in S2 and S3, t...

Embodiment 1

[0047] A transparent heat-resistant fully degradable polylactic acid composite material, each component is calculated in parts by weight,

[0048] 100 parts of L-polylactic acid, 10 parts of high molecular weight L-lactic acid, 1 part of TMB-5, 0.3 parts of antioxidant 1010. The molecular weight of L-polylactic acid is 1*10 5 g / mol, the molecular weight of high molecular weight L-polylactic acid is 2*10 6 g / mol.

[0049] Its preparation method is,

[0050] S1 Dry L-polylactic acid and high molecular weight L-polylactic acid at 60-80°C for 6-8 hours for later use;

[0051] S2 High molecular weight L-polylactic acid and β-nucleating agent are physically blended first, and then added to the extrusion process to melt, extrude and granulate. 8h drying treatment to obtain the nucleating masterbatch;

[0052] S3 nucleating masterbatch is first physically blended with L-polylactic acid and antioxidant 1010. After physical blending, it is melt-extruded and granulated. The polylacti...

Embodiment 2

[0055] The difference between this embodiment and embodiment 1 is that the distribution ratio of each component is different.

[0056] A transparent heat-resistant fully degradable polylactic acid composite material, each component is calculated in parts by weight,

[0057] 100 parts of L-polylactic acid, 15 parts of high molecular weight L-lactic acid, 1.5 parts of TMB-5, 0.3 parts of antioxidant 1010.

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Abstract

The invention relates to the technical field of polylactic acid modification, and discloses a transparent heat-resistant fully-degradable component polylactic acid composite material and a preparation method thereof. The composite material comprises polylactic acid and nucleating masterbatch; the nucleating masterbatch comprises high-molecular-weight polylactic acid and a beta-nucleating agent; the composite material comprises the following components in parts by weight: 100 parts of polylactic acid, 3-15 parts of high-molecular-weight polylactic acid and 1-10 parts of the beta-nucleating agent. The invention also discloses a preparation method of the composite material. According to the polylactic acid composite material, the adopted process is simple and easy to operate, and after the transparency-heat resistance is optimized, the polylactic acid composite material can be widely applied to high-performance PLA-based composite materials and manufacturing of important industrial products including medical materials, high-temperature sterilization, degradable packaging and the like.

Description

technical field [0001] The invention relates to the technical field of polylactic acid modification, in particular to a transparent heat-resistant fully degradable polylactic acid composite material and a preparation method thereof. Background technique [0002] With the full implementation of the ban on plastics, the development of the degradable plastics industry has been greatly promoted, and the market demand for degradable plastics will increase significantly. Among many degradable polymer materials, polylactic acid has the advantages of large output, low price, excellent comprehensive mechanical properties and renewable resources. It will become the mainstream product of degradable plastics in the future, with broad development prospects. [0003] However, since polylactic acid (PLA) belongs to polyester, its molecular chain is relatively rigid, and the mobility of molecular segments is limited. Its low molecular chain flexibility will lead to slow crystallization proc...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K5/00C08J3/22
CPCC08L67/04C08J3/226C08L2201/06C08L2201/08C08L2201/10C08L2205/025C08J2367/04C08J2467/04C08L2205/24C08K5/0083
Inventor 李正秋陈宝书赵天宝陈月铃杨文超吴婷
Owner XIHUA UNIV
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