871results about How to "Reduce air permeability" patented technology

A respiratory mask for continuous positive airway pressure treatment includes a cushion adapted to be positioned against the face of a patient. The cushion is configured in a gasket arrangement around an entrance to the airways of the patient. The cushion is constructed from a polyurethane foam and has a thickness of greater than about 5 mm.

The present invention relates to a bag type paste-injecting hole-sealing equipment and its hole-sealing method. Said bag type paste-injecting hole-sealing equipment includes the following several portions: bag, internal end supporting component, middle portion supporting component, external end supporting component, paste injection control valve, reverse check valve and pressure control pin. Besides, said invention also provides the concrete steps of said hole-sealing method.

The present invention relates to a polymer electrolyte fuel cell comprising: an electrolyte membrane-electrode assembly including an anode, a cathode and a polymer electrolyte membrane interposed therebetween; an anode-side conductive separator plate having a gas flow channel for supplying a fuel gas to the anode; and a cathode-side conductive separator plate having a gas flow channel for supplying an oxidant gas to the cathode. A conductive separator plate made of carbon has poor wettability with water. This has posed the disadvantage that variations in performance are induced by nonuniform gas distribution among cells due to the accumulation of product water or humidifying water in the gas flow channel on the surface of the separator plate. The present invention employs a conductive separator plate comprising a conductive carbon having a hydrophilic functional group, at least in a portion of the gas flow channels, thereby preventing water from accumulating in the gas flow channels.

A decorative material is provided which particularly possesses excellent adhesion properties. The decorative material comprises: a substrate; a print layer provided on the substrate; a protective layer provided on the print layer, the protective layer comprising an ionizing radiation-cured resin; and a stress relaxing layer as a primer layer provided between the print layer and the protective layer, for relaxing shrinkage stress caused at the time of curing of an ionizing radiation-curable resin for the formation of the ionizing radiation-cured resin constituting the protective layer.

A nanocomposite composition having a silicone elastomer matrix having therein a filler loading of greater than 0.05 wt %, based on total nanocomposite weight, wherein the filler is functional graphene sheets (FGS) having a surface area of from 300 m²/g to 2630 m²/g; and a method for producing the nanocomposite and uses thereof.

A composition well suited to forming gas barrier layers in elastomeric articles is described. The barrier layer may be incorporated into, for instance, inflatable articles that are intended to contain a gas, such as air, under pressure. For example, in one embodiment, the barrier layer may be incorporated into a tire for preventing oxygen or other gaseous components from migrating through the tire. In general, the barrier layer is made from an elastomer that is combined with permeability reducing particles, such as a silicate, and a terpene hydrocarbon resin having a relatively high glass transition temperature. The terpene hydrocarbon resin can improve the processability of the composition and, in one embodiment, can even serve to improve the permeability characteristics of the barrier layer.

The invention discloses a gas extraction center divided-flow type grouting and hole sealing device which comprises an extraction pipe, a grouting plug, a left bag and a right bag, wherein the extraction pipe penetrates through the left bag and the right bag, a multifunctional valve is arranged in the extraction pipe, and the left side and the right side of the multifunctional valve are respectively connected with a left flow division pipe and a right flow division pipe; the left flow division pipe and the right flow division pipe are both sheathed on the extraction pipe, and the inner diameter of the left flow division pipe and that of the right flow division pipe are both greater than that of the extraction pipe so as to form a slurry passage among the left flow division pipe, the right flow division pipe and the extraction pipe; and a grouting insertion pipe is inserted into the extraction pipe. Through the gas extraction center divided-flow type grouting and hole sealing device, more effective grouting and hole sealing of drilling holes in the hole sealing section can be realized, and the generation and the propagation of leakage cracks around the drilling holes can be better prevented. The invention also provides a hole sealing method by using the gas extraction center divided-flow type grouting and hole sealing device. Through the method, high stress regions are produced around the drilling holes in the hole sealing section, the permeability of coal around the drilling holes in the hole sealing section is reduced, and the purpose of effectively grouting and sealing the drilling holes in the hole sealing section is realized.

Provided is a fabric that is favorably used for a side cloth of a down wear, a down jacket, a futon, a sleeping bag or some other, and that is light, thin and high in tear strength and can further keep a low air permeability after washed. The high-density fabric of the present invention that can attain the purpose is a fabric including a synthetic fiber that has a fineness of 28 dtex or less, and having a total cover factor ranging from 1700 to 2200. In this fabric, multifilaments are present in each of which monofilaments are arranged in the form of two layers in at least one direction of warp and weft directions. Furthermore, the fabric has a cover factor ranging from 700 to 900 in at least one direction of the warp and weft directions which has the multifilaments present.

The present invention provides a printed wiring board comprising: a conductor circuit on an insulating substrate, a white solder resist layer which is composed of a photosensitive resin composition on the insulating substrate having the conductor circuit, and a protective layer which is composed of a silicone resin composition on the white solder resist layer. The inventive printed wiring board shows superior thermo-discoloration resistivity and excellent patterning resolution.

The invention discloses a precision casting method for high temperature alloy complex thin-walled castings. The method comprises the following steps of: utilizing a medium frequency induction heating power supply to melt the alloy, utilizing a medium baffle to separate an upper tank and a lower tank, and utilizing an electric hoist to elevate the upper tank when a casting mold and a liquid rising tube are installed; after the installation is completed, utilizing a gas circuit control pipeline, a vacuum system and a gas tank to realize vacuum and pressure regulation in a pressure regulating furnace. By adopting the method disclosed by the invention, stable and efficient mold filling is realized, the castings is solidified sequentially, utilization efficiency of the material can be effectively improved, and the space for near-end net shape casting can be supplied; the complex, thin-walled and integral metal castings which are difficult to cast through other molding methods can be produced, so as to solve the filling problem in the pouring process of the complex thin-walled castings, and in particular, the filling capacity for the thin-walled castings with the wall thickness of less than 3mm is greatly improved. Accurate castings with high dimensional accuracy can be obtained through high temperature alloy pressure regulating investment precision casting, and the accuracy of the casting can reach between CT4 and CT6.

The present invention relates to a high refraction and high adhesion large power LED packaging organosilicon material and a chemical synthesis method thereof. The organosilicon packaging material is prepared by carrying out mixing matching on a component A and a component B according to a mass ratio of 1:1, wherein the component A comprises vinyl phenyl polysiloxane, vinyl phenyl silicone oil, a platinum-containing polysiloxane catalyst and a tackifier, the component B comprises hydrogen-containing phenyl polysiloxane, dihydrideterminated phenyl polysiloxane, vinyl phenyl polysiloxane and an inhibitor, the tackifier is prepared by carrying out addition on isocyanate, methoxy silane and epoxy silane, and provides strong adhesion for PPA and a silver surface, the curing agent is prepared by compounding hydrogen-containing phenyl polysiloxane and dihydrideterminated phenyl polysiloxane, and a compounding mass ratio is preferably 4:1-2, such that the packaging material has moderate hardness and flexibility after curing so as to effectively solve contradiction of strength and cracking of the cured adhesive. With the present invention, the organosilicon packaging material with characteristics of refraction of 1.54, suitability for industrialization and fully meeting of large power LED packaging requirements can be obtained.

The invention discloses a method for preparing a high temperature resistant composite separator by a lithium ion battery, and belongs to the field of lithium ion battery separators. The method comprises the following steps: active groups are introduced into the surface of a polyolefin microporous film and a micropore through the surface pretreatment of a substrate film, silica sol is prepared by a sol-gel method, and a silica coating is introduced, and is bonded with the substrate film by a chemical bond. The method is simple in preparation process, low in requirement on equipment, and easy to realize the industrialization; the prepared composite separator has the advantages of high mechanical strength, good air permeability, good high temperature resistance, high ionic conductivity, and good adhesion property of silica coating and polyolefin microporous film, and the silica coating is not easy to fall off, so that the safety performance and the comprehensive property of the separator are improved.

The invention discloses a preparation method of acrylate modified water-borne polyurethane emulsion for synthetic leather. The preparation method comprises the following steps of: 1) preparing water-borne acrylate emulsion; 2) preparing water-borne polyurethane emulsion; and 3) physically blending the water-borne acrylate emulsion obtained in the step 1) and the water-borne polyurethane emulsion obtained in the step 2) to obtain the acrylate modified water-borne polyurethane emulsion for synthetic leather. The preparation method disclosed by the invention has the advantages that: by introducing a natural reproducible polyhydric alcohol compound namely castor oil, the water resistance of the water-borne polyurethane material can be improved, and good flexibility, cold resistance and warping strength of the coating are obtained at the same time; meanwhile, by adding a silane coupling agent, good air permeability and flexibility of the material can be obtained, and the water-borne polyurethane emulsion can be spread on the surface of a base material (particularly a non-polar base material) better so as to improve the adhesive force and water repellency; and moreover, by modifying with the thermoplastic material namely water-borne acrylate, the embossing stability of the water-borne polyurethane leather can be improved.

Mash gas treating method of floor well drilling having three functions and floor well drilling are disclosed, the character of it is that gas is token out by using the same floor well drilling in ground with the following steps; First, before exploiting , mounting fracturing well formal floor well drilling, forming artificial slit and gas producing channel with fracturing method in coal seam, collecting gas using positive-pressure released by gas burning-self, eliminating projection of lower coal and gas; Second exploiting lower coal group, pressure relief and stress releasing of upper coal group and middle coal group when lower coal group is exploited, and gas of upper coal group and middle coal group in bending subsiding belt is exploited by negative-pressure type in the same floor well drilling; Finally, when exploiting upper coal group and middle coal group, once more the same floor well drilling negative-pressure exploits the exploited region gas in middle coal group or upper coal group working surface. Gas exploiting ratio of the method is high, ratio between cost and efficiency is good, and exploited gas concentration is high.

An expanded micropore polytetrafluoroethylene film (it is named ePTFE film briefly) Preparation is an improved method of the existing polytetrafluoroethylene film preparation. It includes mixing materials, striking adobe, squeezing, pulling longitudinally and pulling horizontally, it is characterized by: using the mold head of flat finish mold in squeezing procedure; adding glazing procedure between the squeezing procedure and pulling longitudinally procedure. The ePTFE film prepared by the technology can balance two important physics properties of permeability and stretching splitting strong force of ePTFE film and gain the ePTFE film with high permeability, high stretching splitting strong force, high uniformity and good appearance. The invention can be uses for produce mass ePTFE film with stabilizing appearance and property and improve the products property of the ePTFE film effectively.

The invention discloses a protective sealing door for an underground refuge chamber. The protective sealing door comprises a door frame and a door plate, wherein the door plate is arranged on the door frame through a rotation shaft; a locking mechanism for locking the door plate on the door frame is arranged on the door plate, a plurality of first reinforcing ribs for reinforcing the strength of the door plate are arranged in the door plate; heat-insulating materials, namely aerogel heat-insulating felts are filled among the reinforcing ribs; at least two annular sealing rings, namely flame-resisting sealing rings are arranged at the joint of the door plate and the door frame; and the periphery of the door plate is locked by the locking mechanism. According to the protective sealing door, the aerogel heat-insulating felts which can bear the temperature of 1,400 DEG C to the maximum are filled in the door plate, so that the door plate can resist high temperature generated during explosion, and the high temperature is insulated out of the refuge chamber; at least two sealing rings which are made of flame-resisting, anti-static, high temperature-resisting and oil-resisting materials are arranged on the contact surface of the door plate and the door frame, so that the protective sealing door has a good sealing effect.

A woven or knit fabric containing crimped composite fibers having its air permeability enhanced by water wetting and being useful in clothes such as outerwear, which woven or knit fabric contains 10 to 100 mass % of composite fibers of side-by-side type or eccentric core sheath type composed of polyester resin component and polyamide resin component whose thermal shrinkages are different from each other, the composite fibers having crimps developed by heat treatment. The composite fibers exhibit humid crimp factor HC_F (%), as measured through a procedure comprising immersing the same in water of 30° C. for 2 hr, pulling them up, interposing them between a pair of filter papers at 30° C. in a humidity of 90% RH within 60 sec of the pulling up and applying a pressure of 0.69 mN/cm² for 5 sec, of ≧10% lower than the dry crimp factor DC_F (%) after dying by allowing them to stand still at 20° C. in a humidity of 65% RH for 24 hr, so that the woven or knit fabric exerts of the effect of air permeability enhancement by water wetting.

The invention discloses a sodium alginate-chitosan double-layer edible membrane as well as a preparation method and an application thereof. The sodium alginate-chitosan double-layer edible membrane isprepared from a sodium alginate membrane and a chitosan membrane through cross-linking compounding. The sodium alginate-chitosan double-layer edible membrane is prepared from a safe and non-toxic material, wide in raw material source, low in production cost and good in membrane forming property, the eating security of an edible inner packaging membrane is improved, through synergetic promotion ofthe components, the air permeability of the membrane is remarkably degraded, the oxygen permeation rate of the membrane is remarkably reduced, the tension property and the transparency of the membrane are remarkably improved, and the membrane is easy to degrade; due to addition of a natural antibacterial agent, microorganism pollution can be very well prevented; the thickness of the membrane canbe controlled by changing the proportioning of the sodium alginate to the chitosan, and then the mechanical properties, the dissolution degree and the antibacterial agent release speed of the membraneare controlled; and the membrane is simple in preparation step, and by adopting the preservative membrane made from the membrane disclosed by the invention, moisture loss and microorganism pollutionin the transportation, storage and processing process of fruits and vegetables can be reduced.