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A technology of ultra-high molecular weight polyethylene, which is applied in the field of preparation of ultra-high molecular weight polyethylene, can solve the problems of increased drop rate and many mechanical properties, and achieve the advantages of increased processing speed, less corrosion of processing equipment, and lower die head pressure Effect
Inactive Publication Date: 2019-04-30
SINOPEC YANGZI PETROCHEM +1
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These methods can significantly improve the processing performance of ultra-high molecular weight polyethylene resin, but the mechanical properties of blends of UHMWPE and medium and low molecular weight PE are much lower than that of pure UHMWPE, and the range of decline increases with the proportion of UHMWPE.
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Embodiment 1-1
[0032] Add 200 liters of hexanesolvent into the 300-liter reactor, start stirring, and set the stirring speed at 240 rpm. Add B1 butene, then add cocatalyst triethylaluminum (TEAL, hexanesolvent, concentration is 0.88mol / L) and 1.0CAT-C respectively in turn, the ratio of Al to Ti is 27, and the reaction is carried out by external circulating water The material in the kettle is heated to T1=80°C, and then continuously feeds ethylene to maintain the total pressure of the reactor P1=1.8MPa (ie polymerization pressure) for slurry polymerization.
[0033] Polymerize for 2 hours, Y1=4Kg, stop the first stage reaction, the sample is marked as U1a.
[0034] The excess gas was vented, the reaction pressure was reduced to P2=1.0 MPa, and B2 butene was added. At the same time, the temperature of the materials in the reactor was lowered to T2=70° C. through external circulating water, and the polymerization was maintained for 3 hours, Y2=16Kg, and the reaction was terminated. The resi...
Embodiment 1-2
[0039] The basic process is the same as in Example 1-1, but with the following changes:
[0040] Y1 is changed to 8Kg, and Y2 is changed to 12Kg. In this way, Y1 / Y2=40 / 60.
[0041] B1 = 200g, B2 = 300g.
[0042] Products obtained in Stage 2 are labeled U2a and U2, respectively.
[0043] The butene content of U2 is 1.0 mol%, and the butene content of U2a is 1.0 mol%.
Embodiment 1-3
[0045] The basic process is the same as in Example 1-1, but with the following changes:
[0046] Y1 is changed to 12Kg, and Y2 is changed to 8Kg. Like this, Y1 / Y2=60 / 40.
[0047] B1=300g, B2=200g.
[0048] Products obtained in Stage 2 are labeled U3a and U3, respectively.
[0049] U3 had a butene content of 1.0 mol%, and U3a had a butene content of 0.9 mol%.
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technical field [0001] The invention relates to a preparation method of ultra-high molecular weight polyethylene, which belongs to the field of polyethylene preparation. Background technique [0002] Ultra-high molecular weight polyethylene, the English name ultra-high molecular weight polyethylene (UHMWPE for short) refers to a linear structure polyethylene with a relative molecular weight of more than 1.5 million g / mol. Excellent wear resistance, high impact strength, excellent self-lubricating performance and low temperature resistance, which ethylene does not have, are widely used in industry and civil use. [0003] Because UHMWPE has a high molecular weight, its molding process is very difficult, mainly manifested in slow processing speed, poor appearance of the product, narrow molding temperature range, and easy oxidative degradation. In order to overcome the defects of UHMWPE extrusionprocessing operations, generally through two ways, one is to improve processing eq...
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