Poly-methyl ethylene carbonate composition and preparation method thereof
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A technology of polymethyl ethylene carbonate and composition is applied in the field of polymethyl ethylene carbonate composition and preparation thereof, and achieves the effects of improving flexibility, improving film-forming property and reducing processing temperature
Active Publication Date: 2015-02-25
SUN YAT SEN UNIV +1
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[0005] The object of the present invention is to solve the technical problem of existing polymethylethylene carbonate composition, a kind of polymethylethylene carbonate composition is provided
Method used
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Embodiment 1
[0036] TPU: polyether type (ET), Shore hardness 75A, 85A (Tg=-18.9°C); polyester type (ES), Shore hardness 85A (Tg=-13.6°C), 90A.
[0040] The TPU / PVA pellets are hot-pressed by a flat vulcanizer, and the sample is cut for DMA testing. The loss peak at 1Hz frequency represents the glass transition temperature Tg.
[0041] Table 1 Glass transition temperature test of different grades of TPU and PVA blends
[0042]
[0043] As shown in Table 1, when TPU and PVA are blended, the glass transition temperature of TPU and PVA changes, which shows that there is an interaction between TPU and PVA. The glass transition temperature of polyester TPU (85ES) increased from -13.6°C to 1.2°C of 50TPU / 50PVA, while the glass transition temperature of polyether TPU (85ET) decreased from...
Embodiment 2～6
[0047] Table 2 Experimental formula Unit: parts by weight
[0048]
[0049] Experimental steps:
[0050]S1. Raw material pretreatment: Thermoplastic polyurethane TPU and polyvinyl alcohol PVA are dried at 100°C for 4 hours, and polymethylethylene carbonate PPC is dried at 80°C in a blast oven for 12 hours. According to the ratio in Table 4, together with additives Mix in a high-speed mixer for 2 minutes, mix well and pour into twin-screw for blending and granulation.
[0051] Twin-screw blending process for the first time: screw aspect ratio 40, feeding section 150-170°C, mixing section 175-190°C, screw speed 160rpm, feeding speed 2.5Kg / h.
[0052] S2. The TPU / PVA blend obtained by mixing is weighed by extrusion, granulation, mixed with a certain amount of PPC weighed in a high-speed mixer for 2 minutes, mixed evenly, poured into twin-screw blending and granulation.
[0053] The second twin-screw blending process: the feeding section is 100-140°C, the mixing section is 16...
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Abstract
The invention relates to the technical field of modified materials, and discloses a poly-methyl ethylene carbonate composition and a preparation method thereof. The composition comprises the following raw materials: a poly-methyl ethylene carbonate matrix, a modified material and an adjuvant, wherein the modified material is composed of thermoplastic polyurethane and polyvinyl alcohol in melting and blending manners; the mass ratio of the modified material to the poly-methyl ethylene carbonate is (10-100) to 100; polyvinyl alcohol accounts for 30%-50% by mass of the modified material; the adjuvant accounts for 0.5%-2%. The preparation method comprises the following steps: melting and blending TPU with PVA; and then blending and pelletizing with PPC. The composition disclosed by the invention has the advantages of good film-forming property and dimensional stability, good tensile strength, breaking elongation, biodegradability and the like. The composition disclosed by the invention does not agglomerate or deform, and does not affect the processability after being placed for a long period of time when the matrix cost is lowered; the film is not bonded; the breaking elongation of the film disclosed by the invention after water absorption is increased; and meanwhile, good tensile strength is kept.
Description
technical field [0001] The invention relates to the technical field of modified materials, and more specifically, to a polymethylethylene carbonate composition and a preparation method thereof. Background technique [0002] Environmental issues have always attracted people's attention, among which greenhouse gases, white pollution and other issues are difficult problems that countries all over the world have been seeking to solve. If the production of a material can utilize and fix the industrial waste gas CO discharged into the atmosphere 2 , after it completes the mission of use, it can be naturally degraded. This material is of great significance to production and life. Polymethylethylene carbonate (PPC) is produced by the greenhouse gas CO 2 It is obtained by copolymerization with propylene oxide PO in the presence of a catalyst. It is a completely biodegradable and environmentally friendly material. The PPC molecules are tightly arranged, easy to process, and have goo...
Claims
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