Ultrahigh-molecular-weight polyethylene composite material with hydrophilicity as well as preparation and application thereof
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A technology of ultra-high molecular weight and composite materials, which is applied in the field of preparation of ultra-high molecular weight polyethylene composite materials, which can solve the problems of uncontrollable polyethylene molecular weight distribution, unfavorable industrial production, and lack of stability, and achieve excellent hydrophilicity , good adhesion and excellent mechanical properties
Active Publication Date: 2021-09-14
上海联乐化工科技有限公司 +2
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Although the mixture prepared by this method is hydrophilic and can be processed, it also has some disadvantages, specifically: 1. The molecular weight distribution of ultra-high molecular weight polyethylene during the polymerization process is uncontrollable and has no stability; 2. The two substances Physical mixing will reduce mechanical properties, such as tensile strength, elongation at break, impact strength, etc.; 3. The preparation process is complicated and takes a long time, which is not conducive to industrial production
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Embodiment 1
[0038] A hydrophilic ultra-high molecular weight polyethylene composite material prepared by a method comprising the following steps:
[0039] Step (1): in the autoclave of 30L stainless steel, use N 2 Replace 5 times, start vacuuming for 2 hours when heated to 45-50°C in a circulating water bath, and then add 12443g of mixed organic solvent (according to n-hexane: heptane: 1,2-dimethoxyethane: white oil = 20 %: 60%: 10%: 10% mixed, the above is mass percentage), and the mass of ethylene added is 25420g.
[0040] The mass fraction of adding 654.9g is 5% (the implication that the mass fraction is 5% here refers to that a certain amount of cocatalyst mixture is mixed with the above-mentioned organic solvent, so that its mass percentage is 5%.) mixed cocatalyst (according to trimethylaluminum: triethylaluminum: tri-n-butylaluminum=5%: 90%: 5% mixing, the above is the mass percent), finally add the Z-N catalyst of 400mg, be 58 ℃ at polymerization reaction temperature, reaction E...
Embodiment 2
[0052] Compared with Example 1, most of them are the same, except in this example:
[0053] The organic solvent used is a mixture of n-hexane, heptane, 1,2-dimethoxyethane and white oil, and the mass percentages of the four are 75%, 15%, 5% and 5% respectively.
Embodiment 3
[0055] Compared with Example 1, most of them are the same, except in this example:
[0056] The organic solvent used is a mixture of n-hexane, heptane, 1,2-dimethoxyethane and white oil, and the mass percentages of the four are 20%, 70%, 6% and 4% respectively.
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Abstract
The invention relates to an ultrahigh-molecular-weight polyethylene composite material with hydrophilicity as well as preparation and application thereof. A preparation method comprises the following steps: in an inert atmosphere, mixing a Z-N catalyst, a cocatalyst and an organic hydrocarbon solvent, conducting heating and stirring to carry out a polymerization reaction, continuously and uniformly injecting an initiator and a grafting monomer into a reaction container by using a high-pressure metering pump after the reaction is carried out for a certain period of time, continuing reacting for a period of time, and then successively carrying out uniform stirring, filtering, washing and drying to obtain the ultrahigh-molecular-weight polyethylene composite material with hydrophilicity. Compared with the prior art, the ultrahigh-molecular-weight polyethylene composite material prepared by the invention contains a large number of hydrophilic groups on the surface and has a stable dispersion effect in water; viscosity average molecular weight can be controlled to be in a range of 1,000,000 and 10,000,000; the preparation method is simple, convenient, green and environment-friendly; a finished product is prepared at one time, secondary treatment is not needed, and large-scale industrial production is easy to realize; and when the composite material is applied to a water-based paint, the modified epoxy resin can greatly improve the flexibility, strength and other properties of the paint.
Description
technical field [0001] The invention belongs to the technical field of polymer material preparation, and relates to a method for preparing a hydrophilic ultra-high molecular weight polyethylene composite material. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) is a high molecular weight linear structure polyethylene with a molecular weight distribution from 1 million to 10 million. Due to its ultra-high molecular weight, its physical and chemical properties change suddenly, its wear resistance, impact resistance, stress crack resistance, corrosion resistance, light resistance, anti-adhesion, self-lubricating, hygienic, non-toxic, green and environmental protection And other characteristics are unmatched by existing materials. Because ultra-high molecular weight polyethylene has such excellent comprehensive properties, it is widely used, mainly in machinery, chemical industry, transportation, military, textile, mining, agriculture and other f...
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