Ultrahigh molecular weight polyethylene and preparation method thereof
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An ultra-high molecular weight polyethylene technology, applied in the field of ultra-high molecular weight polyethylene preparation, can solve the problems of low processing efficiency, low extrusion speed, and difficulty in extrusion of ultra-high molecular weight polyethylene, and achieves low die pressure, The effect of small extrusion current, improving production efficiency and yield
Inactive Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0008] Purpose of the invention: The purpose of the invention is to solve the ubiquitous extrusion difficulties of UHMWPE prepared in the prior art, which requires specially designed basic equipment; processing aids need to be added during processing; the extrusion speed is low and the processing efficiency is low To solve such problems, provide an ultra-high molecular weight polyethylene resin that retains the good mechanical properties of ultra-high molecular weight polyethylene and can be easily molded on existing processing equipment
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Embodiment 1
[0037] Add 200 liters of hexane solvent into the 300-liter reactor, start stirring, and set the stirring speed at 240 rpm. Then add co-catalyst triethylaluminum (hexane solvent, concentration: 0.88 mol / L) and 1.0 g catalyst CAT-C respectively in sequence, and the ratio of Al to Ti is 27. Heat the material in the reactor to T1=80°C by external circulating water, and then continuously feed ethylene to maintain the total pressure of the reactor P1=1.8MPa (ie polymerization pressure) to carry out slurry polymerization.
[0038] Polymerize for a certain period of time, when 4Kg is absorbed by ethylene (promptly obtain product output about Y1=4Kg), stop the first stage reaction, take a sample and test the polymer viscosity-average molecular weight, and the sample is marked as U1A.
[0039] Exhaust the excess gas, reduce the reaction pressure to P2=1.0MPa, and at the same time reduce the temperature of the material in the reactor to T2=70°C through the external circulating water, mai...
Embodiment 2
[0042] The basic process is the same as in Example 1-1, but with the following changes:
[0043] Y1 is 8Kg, Y2 is 12Kg, like this, Y1 / Y2=40 / 60.
[0044] Products obtained in Stage 2 are labeled U2A and U2, respectively.
Embodiment 3
[0046] The basic process is the same as in Example 1-1, but with the following changes:
[0047] Y1 is 12Kg, Y2 is 8Kg, like this, Y1 / Y2=60 / 40.
[0048] Products obtained in Stage 2 are labeled U3A and U3, respectively.
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Abstract
The invention discloses an ultrahigh molecular weight polyethylene and a preparation method thereof. The ultrahigh molecular weight polyethylene is prepared by the following steps: taking an active titanium supported catalyst as the main catalyst, organic aluminum compounds as the co-catalyst, and ethylene as the polymerization raw material, and carrying out two-stage polymerization reactions in an alkane solvent; wherein the viscosity average molecular weight of the polymerization products of the first stage is 800,000 to 2,200,000, and the viscosity average molecular weight of the polymerization products of the second stage is 2,000,000 to 4,200,000. The prepared ultrahigh molecular weight polyethylene is applied to pipe extrusion and has the following advantages: (1) processing performance is better, compared with commercial polyethylene, the pressure on the die head of an extruding machine is lower, the extrusion current is smaller, and the provided polyethylene can be used to produce pipes with a larger diameter; (2) the smoothness of the external surface of prepared ultrahigh molecular weight polyethylene pipes is prominently better than that of commercial resin; and (3) the production efficiency and yield rate of extruded pipes are both improved by using the ultrahigh molecular weight polyethylene.
Description
technical field [0001] The invention belongs to the technical field of high molecular compound synthesis, and in particular relates to a preparation method of ultra-high molecular weight polyethylene with excellent mechanical properties and processing properties. Background technique [0002] 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. Due to its high molecular weight, it exhibits excellent wear resistance that ordinary polyethylene does not have. Wear performance, high impact strength, excellent self-lubricating performance and low temperature resistance, etc., have been widely used in textile, paper, food, chemical, packaging, agriculture, construction, medical, filter elements of filter materials, sports , entertainment, military and other fields. [0003] Because UHMWPE has a high molecular weight, its molding process is very difficult, the main per...
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