摘要:
A battery separator comprising an ultra-high molecular weight polyethylene microporous membrane radiation grafted with a monomer, the separator having the following properties:(a) a porosity ranging from about 50% to about 95%,(b) an average pore size ranging from about 0.1 to about 20 microns,(c) an electrolytic resistance ranging from about 1 to about 50 m.OMEGA.-in.sup.2,(d) a maximum weight loss of 1% and a change in electrolytic resistance of no greater than 25% after immersion in an aqueous solution of 35% KOH and 5% KMnO.sub.4 at 50.degree. C. for 1 hour,(e) a tensile strength of from about 3.5 to about 5.5 lb/in in both length and width directions,(f) a KOH absorption ratio of from about 5 to about 30,(g) a Gurley air permeability of about 1 to 300 sec/10 ml, and(h) a thickness from about 0.5 mil to about 10 mil.Further provided is a battery comprising at least one pair of electrodes of opposite polarity, an electrolyte, and a separator of the present invention located between the electrodes of opposite polarity.
摘要:
The present invention provides a battery separator comprising a nonwoven electrolyte reservoir layer bonded to a nonwoven support layer. The support layer comprises fibers having a mean diameter greater than about 15 microns, and preferably has been calendared to a thickness of less than about 10 mils, with a thickness variability of no more than about 10%. The electrolyte reservoir layer comprises fibers having a mean diameter of about 10 microns or less, and a thickness of less than about 15 mils, and preferably is melt-blown directly onto the support layer. The nonwoven fibers that comprise the electrolyte reservoir layer and the support layer are selected from the group consisting of polyethylene, polypropylene, polymethylpentene, and combinations thereof. The present invention also provides a battery containing such a battery separator, as well as a method of preparing such a battery separator.
摘要:
A filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing positively charged quaternary ammonium groups covalently bonded to the membrane, and a method of using the filter medium to treat a composition, particularly a biological or pharmaceutical composition such as an ophthalmic composition.
摘要:
A method for treating raw milk to produce treated milk having a lower bacterial content than the raw milk. The milk is homogenized and, within about 5 minutes from the homogenization, subjected to dynamic microfiltration, to yield a filtrate which has a lower bacterial content than the initial raw milk. When the flow rate of milk through the microfilter drops below a predetermined level, the dynamic microfilter is removed from milk filtration service, flushed with water, and returned to milk filtration service, the steps being repeated as necessary until the membrane cannot be rejuvenated to a minimum filtration capacity, at which time the membrane is subjected to chemical cleaning to essentially restore the original filtration capacity of the membrane.
摘要:
The present invention provides a method of treating a clogged porous medium comprising contacting a porous medium clogged in the course of filtering a protein-containing fluid, such as milk, beer, or wine, with an aqueous citrate solution.
摘要:
A PVDF membrane exposed to a quarternary ammonium hydroxide solution retains it hydrophobicity and resistance to corrosive environments, yet spontaneously and completely wets with concentrated sulfuric and nitric acids. The modified membrane is incorporated into filtration devices that are in situ integrity testable in concentrated inorganic mineral acids.
摘要:
Filter cartridge elements are provided with a spiral wrapping made from a thermoplastic polymer to give stability against inside-out flow and to protect the filtration medium. The spiral wrapping is attached to underlying turns of the wrap and to the surface of the filter cartridge by fusion bonding.
摘要:
A supported microporous membrane comprising a composite of a microporous membrane and a synthetic thermoplastic web of microfibers secured to the membrane without the use of added adhesive components and having an ASTM D903 peel strength of at least about 2 grams per centimeter, the composite having a modulus of flexure at leasts 10 percent greater than that of the membrane, and the method of manufacturing such supported membranes by contacting thermplastic microfibers with the membrane while the microfibers are at an elevated temperature.
摘要:
Polymeric microfibrous structures comprised of normally hydrophobic microfibers coated with a cured, precipitated, cationic, thermosetting binder resin or polymer and characterized by being hydrophilic and having a positive zeta potential with enhanced capability for the removal of negatively-charged particulate material in a fluid medium are prepared by a process comprising the steps:(1) combining in a controlled manner a first solution of a water-soluble, non-colloidal, cationic, thermosetting binder resin or polymer and a second solution or dispersion of a precipitating agent to form a stable emulsion or suspension;(2) impregnating the microfibrous structure of normally hydrophobic microfibers with the stable emulsion or suspension to form a fibrous structure wetted with the stable emulsion or suspension; and(3) drying the wetted microfibrous structure and curing the binder resin or polymer.
摘要:
A self-cleaning system and method for dispersing aggregates in a fluid medium is provided. The system is comprised of first and second members operatively associated to form an internal chamber and having an inlet to the chamber for admitting the fluid to be treated. At least one of the members is biased toward the other whereby the introduction of a fluid medium to be treated into the chamber under an operating pressure in the range of from about 50 to about 1,000 psid (3.5 to 70.3 kg/cm.sup.2) provides an elongated orifice between the first and second members having a transverse dimension or width of from about 1 to about 1,500 micrometers for egress of the fluid medium. As the fluid passes through the elongated orifice, aggregates contained therein are dispersed. The system is self-cleaning by virtue of the biased nature of at least one of the members toward the other, thereby providing longer onstream operation and requiring less servicing. The system can be used for treating aggregate-containing fluids such as oil well completion fluids, dispersions used in the manufacture of magnetic tape, and dispersion of particulates such as carbon black and other pigments.
摘要翻译:提供了一种用于将聚集体分散在流体介质中的自清洁系统和方法。 该系统包括第一和第二构件,第一和第二构件可操作地相关联以形成内部腔室并且具有用于容纳被处理流体的腔室的入口。 至少一个构件偏向另一个,由此在约50至约1,000psid(3.5至70.3kg / cm 2)的操作压力下将待处理的流体介质引入室中,提供细长的 在第一和第二构件之间的孔口具有约1至约1,500微米的横向尺寸或宽度,用于流体介质的流出。 当流体通过细长的孔口时,其中包含的聚集体被分散。 该系统由于至少一个构件朝向另一个的偏压性质而自行清洁,从而提供更长的上游操作并且需要较少的维修。 该系统可用于处理含石油的流体,例如油井完井液,用于制造磁带的分散体,以及诸如炭黑和其它颜料的颗粒分散体。