Polymethyl ethylene carbonate modification method, modified material and application thereof
A technology of polymethylethylene carbonate and raw materials, applied in chemical instruments and methods, flexible coverings, climate sustainability, etc., can solve poor mechanical properties and thermal stability, low barrier performance, heavy odor, etc. problems, to achieve the effect of controllable product performance, excellent barrier performance and adhesion performance, and easy regulation
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Embodiment 1
[0039] After drying and metering, premix poly(methylethylene carbonate) and polyolefin plastomer (melt index: 1.0) at a ratio of 70:30 by mass percentage, and put it into the third screw extruder 5 hopper , form a blend through melt mixing, and co-extrude to form a barrier middle layer. Wherein, the third screw extruder 5 has a diameter of 35 mm and an aspect ratio of 26. At the same time, the preparation raw materials for the inner layer and the outer layer are respectively dropped into the fourth screw extruder 6 in the first screw extruder 1, and the preparation raw materials for the adhesive layer are dropped into the second screw extruder 2, wherein , the raw material for the preparation of the inner layer and the outer layer is a blend of low-density polyethylene and linear low-density polyethylene, the melt index of low-density polyethylene is 1.84~2.5, and the melt index of linear low-density polyethylene is 2.0±0.3, The raw material for the preparation of the adhesiv...
Embodiment 2
[0043] The co-extrusion process is basically the same as that of Example 1, except that the material of the barrier middle layer is different. In this embodiment, the blending ratio of polymethylethylene carbonate and polyolefin plastomer is 80:20, and the materials of other layers are the same as in Embodiment 1.
[0044] During the molding process, the temperature of the second screw extruder used to extrude the barrier intermediate layer was controlled at 105-125°C, and other process parameters were the same.
[0045] From Figure 4 It can be found that when the content of polymethylethylene carbonate increases and the content of polyolefin plastomer decreases, the bonding effect between the barrier middle layer and the inner and outer layers is not weakened, the flow interface is stable, the thickness distribution changes slightly, and the thickness of the inner layer The thickness of the middle layer is 0.24 mm, the thickness of the middle layer is 0.11 mm, and the thick...
Embodiment 3
[0047] The co-extrusion process is basically the same as that of Example 1, except that the material of the barrier middle layer is different. In the present embodiment, modifier selects ethylene-vinyl acetate copolymer and maleic anhydride grafted polyethylene, the blend ratio of polymethylethylene carbonate, ethylene-vinyl acetate copolymer and maleic anhydride grafted polyethylene It is 70:20:10, and other each layer material is identical with embodiment 1.
[0048] During the forming process, the temperature of the second screw extruder used to extrude the barrier intermediate layer is controlled at 110-130°C, and other process parameters are the same.
[0049] From Figure 5 It can be found that ethylene-vinyl acetate copolymer and maleic anhydride grafted polyethylene are used as modifiers, the extrusion is stable, the compatibility with polymethylethylene carbonate is good, the thickness of the hose is evenly distributed, and the thickness of the inner layer is 0.25 m...
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Abstract
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