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Pre-crosslinked polylactic acid fiber enhanced polylactic acid plate and preparation method thereof

A technology of polylactic acid fiber and polylactic acid, which is applied in the fields of fiber chemical characteristics, melt spinning, rayon manufacturing, etc., can solve the problems of low strength, achieve good compatibility, increase thermal melting temperature, and improve strength

Active Publication Date: 2017-10-24
HEZE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the background technology, the object of the present invention is to provide a polylactic acid plate reinforced with pre-crosslinked polylactic acid fibers and a preparation method thereof, which is used to solve the problem that the strength of polylactic acid is not high when it is toughened

Method used

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  • Pre-crosslinked polylactic acid fiber enhanced polylactic acid plate and preparation method thereof

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preparation example Construction

[0019] The invention provides a preparation method of a polylactic acid sheet reinforced with pre-crosslinked polylactic acid fibers, comprising the steps of: (1) performing radiation crosslinking on the polylactic acid fibers, and then cutting them into short lengths to obtain pre-crosslinked polylactic acid fibers; 2) After drying the pre-crosslinked polylactic acid fiber in step (1), mix it with polylactic acid, calcium carbonate and tris[2,4-di-tert-butylphenyl] phosphite evenly according to the proportion, and then extrude and granulate , to obtain mixed pellets, the temperature in each zone of the extruder: 120-130 °C in the first area, 140-150 °C in the second area, 165-175 °C in the third area, and 180-200 °C in the fourth area; (3) the Mix the pellets, add them to a single-screw extruder, extrude and calender them, and obtain a polylactic acid composite sheet reinforced with pre-crosslinked polylactic acid fibers. -170°C, 185-195°C in the third zone, 200-220°C in the ...

Embodiment 1

[0038] Add triacryl isocyanurate and dicumyl peroxide to L-polylactic acid according to the ratio, the ratio is 100:7:2, in a high-speed mixer, the temperature is 120 ° C, the speed is 1500 rpm, and the mixture is uniform Finally, add the twin-screw extruder, extrude and granulate, the temperature of each zone of the twin-screw extruder: 125°C in the first zone, 155°C in the second zone, 185°C in the third zone, and 175°C in the fourth zone for granulation to obtain premixed pellets; Put the premixed pellets into a single-screw extruder for melt spinning, melt and extrude into filaments, cool and wind to obtain polylactic acid fibers, the temperature of each zone of the single-screw extruder: the first zone is 135 ° C, the second zone 165°C, 185°C in the third zone, 210°C in the fourth zone; temperature of the spinning box: 212°C.

[0039] After cross-linking the polylactic acid fiber by electron irradiation, the irradiation dose is 15kGy, and it is mechanically cut short to o...

Embodiment 2

[0042]Add triacryl isocyanurate and dicumyl peroxide to dextrorotary polylactic acid according to the proportion, the ratio is 100:5:1, in a high-speed mixer, the temperature is 120 ° C, the speed is 1500 rpm, and mixed After uniformity, add the twin-screw extruder, extrude and granulate, the temperature of each zone of the twin-screw extruder: the first zone is 120°C, the second zone is 150°C, the third zone is 180°C, and the fourth zone is 170°C for granulation to obtain premixed pellets Add the premixed pellets into the single-screw extruder for melt spinning, melt and extrude into filaments, cool and wind to obtain polylactic acid fibers, and the temperature of each zone of the single-screw extruder: 130°C in the first zone, 130°C in the second zone Zone 160°C, Zone 3 180°C, Zone 4 200°C; spinning box temperature: 210°C.

[0043] After cross-linking the polylactic acid fiber by electron irradiation, the irradiation dose is 10kGy, and it is mechanically cut short to obtain ...

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Abstract

The invention provides a pre-crosslinked polylactic acid fiber enhanced polylactic acid plate and a preparation method thereof. The pre-crosslinked polylactic acid fiber enhanced polylactic acid plate comprises the following components: 70 parts of polylactic acid, 15 parts of pre-crosslinked polylactic acid fibers, 5 parts of calcium carbonate, 5 parts of polyvinyl alcohol, and 5 parts of tris(2,4-ditert-butylphenyl) phosphite. After the polylactic acid fibers are pre-crosslinked, the molecular weight is increased, the strength is improved, the heat fusing temperature is increased, the pre-crosslinked polylactic acid fiber enhanced polylactic acid plate is used as an enhancing material to enhance the polylactic acid, and the problem of poor interfacial bonding strength of the enhancing materials does not exist. In process of heat mixing and processing and in a certain temperature range, the shape of the pre-crosslinked polylactic acid fibers can be maintained to form a pre-crosslinked region which is similar to a 'sea island' structure, the pre-crosslinked polylactic acid fibers and a polylactic acid matrix infiltrate into each other, the interfacial bonding strength is further improved, and the strength of the polylactic acid composite material is greatly improved. The compatibility of the pre-crosslinked polylactic acid fibers and the polylactic acid is good, processing is not affected on the premise of not increasing a processing auxiliary, and the pre-crosslinked polylactic acid fiber enhanced polylactic acid plate can be used for various forming processes such as blow molding and injection.

Description

technical field [0001] The invention relates to the field of polymer modification and processing, in particular to a pre-crosslinked polylactic acid fiber reinforced polylactic acid plate and a preparation method thereof. Background technique [0002] Car roofs are generally made of polyurethane (PU) rigid foam boards, polystyrene (PS) foam boards, and hemp fibers. These materials are not only non-biodegradable, seriously pollute the environment, but also release a large amount of volatile organic compounds that are harmful to humans. The body suffers varying degrees of damage. [0003] Simply rely on materials that adsorb VOCs, such as activated carbon, bamboo charcoal, etc., as harmful gas adsorbents, and add them to the board, but the adsorption capacity is weak, and the emission of VOCs cannot be completely eliminated. Therefore, it is required that the material itself does not release harmful gases and is biodegradable to meet people's increasing environmental protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L29/04C08K3/26C08K5/526D01F6/92D01F1/10D01D1/06D01D5/08B29B9/06B29C47/92B29C48/92
CPCB29B9/06B29C48/92B29C2948/92704C08K2003/265C08L67/04C08L2205/025C08L2205/03C08L2205/16C08L2312/06D01D1/06D01D5/08D01F1/10D01F6/92C08L29/04C08K3/26C08K5/526
Inventor 李丽刘庆华
Owner HEZE UNIV