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Polyester/polyethylene alloy material and preparation method thereof
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An alloy material, polyethylene technology, applied in the field of resin, can solve the problems of decreasing tensile strength, reducing tensile strength, etc., to achieve high elongation at break, increase compatibility, and improve mechanical properties.
Active Publication Date: 2016-12-28
SHENZHEN LUHUAN REGENERATION RESOURCE DEV CO LTD
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[0004] Professor Zhang Huaji of Fujian Normal University disclosed a polyester / polyethylene alloy material (Zhang Huaji et al. Preparation and performance research of rPET / mLLDPE / EMAH-g-POE composite material, Engineering Plastics Application, 2010, No. 38 Volume, Issue 12, P4-P7), which uses recycled polyethylene terephthalate (rPET) bottle material as the base material, metallocene linear low-density polyethylene (mLLDPE) as the toughening material, maleic anhydride Branched (ethylene / octene) copolymer (MAH-g-POE) was used as a compatibilizer to prepare rPET / mLLDPE / MAH-g-POE composites, although MAH-g-POE as a compatibilizer can improve the elongation at break, but it will greatly reduce its tensile strength. For example, when MAH-g-POE is not added, the tensile strength of rPET / mLLDPE composite is 32.60MPa, and the elongation at break is 15.67%; MAH-g- When the mass fraction of POE is 5%, its elongation at break reaches 112.17%, but its tensile strength drops below 30MPa
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[0062] The present invention also provides a kind of preparation method of polyester / polyethylene alloy material, comprises the following steps:
[0063] Mix recycled polyester, polyethylene and compatibilizer, and obtain polyester / polyethylene alloy material after melt blending;
[0064] The mass ratio of the recycled polyester, polyethylene and compatibilizer is 10~30:2~5:0.1~1;
[0065] The compatibilizer is maleic anhydride grafted polyolefin elastomer and maleic anhydride grafted linear low density polyethylene.
[0066] The recycled polyester, polyethylene and compatibilizer are the same as the raw materials mentioned above, and the present invention will not repeat them here, only the preparation method will be described in detail.
[0067] The present invention first mixes recycled polyester, polyethylene and a compatibilizer, preferably in a high-speed mixer, and the stirring speed is preferably 100r / min to 300r / min, more preferably 150r / min to 250r / min; the stirring...
Embodiment 1
[0073]
[0074] Dissolve MAH, DCP and Antioxidant 1010 in acetone in proportion, and add them into a high-speed mixer together with POE, mix well to make the materials evenly mixed, and put the mixed materials into a twin-screw extruder, and the temperature of the extruder is 160°C ~190°C, melt extrusion under the condition of host speed of 20rmp to obtain MAH-g-POE.
Embodiment 2
[0076]
[0077] Add the LLDPE and xylene in the above ratio into a three-necked flask equipped with a stirrer and a reflux condenser, and stir. The reaction system was heated to 80°C with an oil bath, and after the LLDPE was completely dissolved, MAH was added. After MAH was dissolved, BPO was slowly added dropwise using a constant pressure dropping funnel. When the reaction is over, remove the oil bath, and when the temperature of the reaction solution drops to 80°C, slowly add 50 mL of acetone dropwise to the system with a constant pressure dropping funnel, and under vigorous stirring, the precipitated grafts are broken into powders and precipitated. After cooling to room temperature under stirring, filter under reduced pressure, wash the powder with remaining acetone, filter, and dry the filtered powder in a vacuum oven to obtain MAH-g-LLDPE.
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Abstract
The invention provides a polyester / polyethylene alloy material which comprises recycled polyester, polyethylene and compatilizer, wherein the mass ratio of the recycled polyester, the polyethylene and the compatilizer is (10-30):(2-5):(0.1-1); and the compatilizer is maleic anhydride grafted polyolefin elastomer and maleic anhydride grafted linear low-density polyethylene. The invention also provides a preparation method of the polyester / polyethylene alloy material. According to the invention, the maleic anhydride grafted polyolefin elastomer and the maleic anhydride grafted linear low-density polyethylene are used as the compatilizer, the compatibility between the recycled polyester and the polyethylene is increased, and the mechanical property of the obtained polyester / polyethylene alloy material is enhanced, so that the polyester / polyethylene alloy material keeps high tensile strength while having high breaking extension rate, and can meet the requirements of processing technologies such as injection molding, extrusion, wire drawing and the like.
Description
technical field [0001] The invention belongs to the technical field of resins, and in particular relates to a polyester / polyethylene alloy material and a preparation method thereof. Background technique [0002] Polyester is a general term for polymers obtained by polycondensation of polyols and polybasic acids, including polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc. A wide range of engineering plastics can be widely used in packaging, electronic appliances, medical and health, construction, automobiles and other fields in the form of bottles or films. [0003] With the increase of the amount of polyester, the recycling of polyester has gradually become a research hotspot. Because the viscosity of the recycled polyester drops more, it is not suitable for direct injection molding processing, but it can be mixed with other resin materials to prepare alloy materials. For example, the Innova Packagiy System N.V. (I.P.S.) company in Belgium mixed recy...
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