Method for regulating mechanical property of polyethylene terephthalate/polyolefin mixture by using magnetic field
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A technology of polyethylene terephthalate and ethylene phthalate is applied in the field of regulating the mechanical properties of polyethylene terephthalate/polyolefin blend materials, and can solve the problem of directional regular arrangement Difficulties and other problems to achieve the effect of improving mechanical properties
Inactive Publication Date: 2008-04-30
EAST CHINA UNIV OF SCI & TECH
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However, the moment for the magnetic field to promote the orientation of the molecules of the diamagnetic substance is small. In the static state, due to the thermal motion and interaction between the molecules, only the torque generated by the action of the external magnetic field can make the polymer molecular chains in the molten state align regularly. very difficult
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Embodiment 1
[0031] Example 1 Comparative example
[0032] 1) PET was dried at 150°C for 6 hours to remove moisture; polypropylene, polypropylene grafted with maleic anhydride, antioxidant 1010 and antioxidant 168 were dried at 100°C for 3 hours.
[0033]2) According to PP 87% (mass percentage, the same below), PET 10%, maleic anhydride grafted polypropylene 3%, and antioxidant 1010 (accounting for 0.3% of polypropylene), auxiliary antioxidant 168 (accounting for poly 0.2% of propylene) ingredients.
[0034] 3) After the material is pre-mixed, it is extruded by a twin-screw extruder, and then drawn into pellets. The temperature of each section of the extruder from the hopper to the die is set to 130°C, 220°C, 270°C, 275°C, 265°C, 260°C, 255°C, 250°C, 245°C, 240°C, 238°C, and the main screw speed is 60r / min.
[0035] 4) The obtained blend pellets were dried in an oven at 100°C for 4 hours.
[0036] 5) Put the dried blend pellets into the material cavity of the plunger extrusion device, ...
Embodiment 2
[0040] A set of rubidium-iron-boron permanent magnets is set at the die of the plunger extrusion device. The blend melt comes out of the die and enters the magnetic field for cooling (see Figure 1). The magnitude of the magnetic field is 0.7T. The direction of extension is parallel. Others are the same as in Example 1.
Embodiment 3
[0042] The direction of the magnetic field is perpendicular to the stretching direction, and the others are the same as those in Example 2.
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Abstract
The invention discloses a method for adjusting and controlling the mechanical properties of a polyethylene terephthalate (PET) / polyolefin blend material by utilizing the action of a magnetic field. The present invention takes general-purpose polyolefin as continuous phase, as polypropylene, polyethylene and copolymers thereof, polyethylene terephthalate as dispersed phase, prepares polymer blend, as the PET of dispersed phase in shearing, Microfibrils are formed under stretching, which reinforces the blend. A magnetic field is applied during the preparation of the blend, and the magnetic field affects the orientation of the PET molecular chains and the de-orientation of the oriented molecular chains after shearing and stretching, and can adjust the orientation degree of the molecular chains in the PET microfibers and the microfibrils. Mechanical properties, so as to effectively control the mechanical properties of the blend material.
Description
technical field [0001] The invention relates to a method for regulating the mechanical properties of polyethylene terephthalate / polyolefin blend materials through the action of a magnetic field. technical background [0002] As a general-purpose polymer material, polyolefin has low price, low density, and easy molding and processing. It has been widely used in home appliances, automobiles, building materials, chemicals, packaging and many other fields. With the advancement of science and technology and the development of society, the requirements for materials are getting higher and higher. Polyolefin materials must be modified to improve their performance or endow them with certain functions in order to meet the increasing use requirements and further expand their applications. scope. [0003] The main ways to improve the performance of polyolefin materials by means of modification are as follows: [0004] 1 Inorganic filler filling [0005] Filling polyolefins with inor...
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