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High-heat-resistance high-strength polylactic acid/inorganic fiber composite material or product and preparation method thereof

A technology of inorganic fibers and composite materials, which is applied in the field of polymer composite materials and its preparation, can solve the problems of petroleum resource consumption environment, inability to strengthen polylactic acid, and lack of mechanical strength, so as to broaden the application range and improve the interface stress transfer efficiency , Enhance the effect of interface interaction

Inactive Publication Date: 2015-06-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Since the 20th century, polymer materials have been widely used in various sectors of the national economy and all aspects of people's lives due to their excellent properties such as light weight, low price, and good flexibility. However, polymer materials that use petroleum as a synthetic raw material While being produced and consumed in large quantities, it has also brought about two serious problems: the massive consumption of limited petroleum resources and the environmental pollution caused by a large amount of waste polymer materials (such as plastics) that are difficult to degrade
However, the existing high-efficiency nucleating agents for polylactic acid (such as amide compounds, etc.) are usually small molecular substances, which do not have mechanical strength, so they cannot be used as reinforcing agents to effectively strengthen polylactic acid.

Method used

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  • High-heat-resistance high-strength polylactic acid/inorganic fiber composite material or product and preparation method thereof
  • High-heat-resistance high-strength polylactic acid/inorganic fiber composite material or product and preparation method thereof
  • High-heat-resistance high-strength polylactic acid/inorganic fiber composite material or product and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Grafting PDLA by in-situ polymerization grafting method: 0.4 g of hydroxylated carbon nanotubes were first dispersed in 150 ml of anhydrous toluene, and then ultrasonically dispersed for 1 h, and then 16 g of D-lactide monomer with a purity of 99.5% and 0.13 ml of catalyst stannous octoate, and then reacted at 120°C for 10 hours under nitrogen atmosphere; the product was completely dissolved in chloroform and vacuum filtered to remove polylactic acid molecules that had not undergone grafting reaction; finally, the suction filtered product was dried to a moisture content of Below 200ppm, the weight average molecular weight is 5×10 3 g·mol, PDLA grafted carbon nanotubes with an optical purity of 99.5%;

[0032] 2) Inorganic fiber modified by PDLA grafting with a weight average molecular weight of 5×10 4 The PLLA matrix with g mol and optical purity of 98% is completely dissolved in chloroform. After stirring and mixing evenly, the masterbatch is prepared by co-precipi...

Embodiment 2

[0035] 1) In situ grafting on the surface of hydroxylated carbon nanotubes by in situ polymerization and grafting to obtain a weight average molecular weight of 9×10 3 g mol, optical purity is 99.5% PDLA, the grafting reaction time is 16h, all the other conditions are the same as embodiment 1;

[0036] 2) Inorganic fiber modified by grafting PDLA with a weight average molecular weight of 1.5×10 5 The PLLA matrix with g·mol and optical purity of 95% is completely dissolved in dichloromethane. After stirring and mixing evenly, the masterbatch is prepared by co-precipitation with absolute ethanol, and vacuum-dried at 60°C for 24 hours for later use. The content of inorganic fiber is 10.0wt%;

[0037] 3) Premix the obtained masterbatch and the vacuum-dried PLLA matrix according to the inorganic fiber content in the obtained composite material to be 3.0wt%, and then add it to a Haake micro extruder at 160°C for melt mixing and granulation. The polylactic acid / carbon nanotube comp...

Embodiment 3

[0039] 1) Grafting PDLA by chemical coupling and grafting method: first disperse 0.4g of aminated carbon nanotubes in 150ml of anhydrous chloroform, then ultrasonically disperse for 1 hour, and then add 15g of them with a weight average molecular weight of 5×10 3 g·mol, PDLA with an optical purity of 98%, and then reacted at 120°C for 24 hours under a nitrogen atmosphere; the product was completely dissolved in chloroform and vacuum filtered to remove PDLA molecules that had not undergone grafting reaction; The product is dried until the water content is lower than 200ppm to obtain a weight average molecular weight of 5×10 3 g·mol, PDLA grafted carbon nanotubes with an optical purity of 98%;

[0040] 2) Inorganic fiber modified by grafting PDLA with a weight average molecular weight of 1.1×10 5 The PLLA matrix with g mol and optical purity of 98.5% is completely dissolved in dichloromethane. After stirring and mixing evenly, the masterbatch is prepared by co-precipitation wit...

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Abstract

The invention discloses a high-heat-resistance high-strength polylactic acid / inorganic fiber composite material or product. Firstly, dextrorotatory polylactic acid or levorotatory polylactic acid is grafted on an inorganic fiber surface, and subsequently the polylactic acid / inorganic fiber composite material or product can be obtained by stereocomplexing of the inorganic fiber surface and a base molecular chain of the dextrorotatory polylactic acid or levorotatory polylactic acid in an interface region by means of melt-mixing, wherein the degree of crystallinity of the material or product is 45.5% to 48.7%, the content of inorganic fibers is 0.2wt% to 5.0wt%, the tensile strength is 49.3Mpa to 55.8MPa, and the heat resisting temperature is 138.4 to 150.2 DEG C. According to the method disclosed by the invention, by utilizing the characteristic that the polylactic acid has chiral molecules, the dextrorotatory polylactic acid or levorotatory polylactic acid grafted on the inorganic fiber surface and a stereocomplex crystal formed by the dextrorotatory polylactic acid base body or levorotatory polylactic acid base body in the interface region are used for synchronously realizing interface reinforcement and high-efficiency nucleation effect on the base body, so the method is ingenious in design and provides an effective and simple way for developing the high-heat-resistance high-strength polylactic acid composite material or product.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials and their preparation, and in particular relates to a polylactic acid / inorganic fiber composite material or product with high heat resistance and high strength and a preparation method thereof. Background technique [0002] Since the 20th century, polymer materials have been widely used in various sectors of the national economy and all aspects of people's lives due to their excellent properties such as light weight, low price, and good flexibility. However, polymer materials that use petroleum as a synthetic raw material While being mass-produced and consumed, it has also brought about two serious problems: the massive consumption of limited petroleum resources and the environmental pollution caused by a large amount of waste polymer materials (such as plastics) that are difficult to degrade. Therefore, the development of biodegradable polymer materials using renewable resourc...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08G63/08C08K9/00C08K9/04C08K7/24C08K7/08C08K7/06
Inventor 白红伟傅强刘慧丽张琴陈枫王珂邓华
Owner SICHUAN UNIV
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