42results about How to "Sufficient mechanical properties" patented technology

The present invention relates to a textile type artificial blood vessel with double-layer warp-knitted stitch structure. It is characterized by that it includes outer layer warp-knitted structure whose water permeability is 1000-3000 ml / sq.cm.min.16kPa and inner layer warp-knitted structure whose water permeability is 250-300ml / sq.cm.min.16kPa, the outer layer warp-knitted structure of said blood vessel is cord stitch, and the inner layer warp-knitted structure of said blood vessel is tricot stitch. Said invention adopts a two-bar warp-knitted fabric to make the above-mentioned outer layer warp-knitted structure and inner layer warp-knitted structure be combined together so as to obtain the invented artificial blood vessel.

The invention discloses a composition for rigid polyurethane foam. The polyurethane foam is prepared from the following components in parts by weight: 3 to 5 parts of polyether polyol A, 2 to 4 partsof polyether polyol B, 2 to 4 parts of polyester polyol C, 0.1 to 0.5 part of foam stabilizer, 0.1 to 0.3 part of pore opening agent, 0.2 to 0.6 part of catalyst, 0.2 to 1.0 part of water and 1 to 3 parts of flame retardant. The preparation method can be used for preparing the rigid polyurethane foam, and comprises the following steps: mixing the composition for the rigid polyurethane foam with isocyanate, and pouring the mixture into a foaming reaction mold for foaming reaction molding. The rigid polyurethane foam is of an open-cell structure, the foam density is larger than or equal to 30 kg / m < 3 >, the compressive strength is larger than or equal to 100 kPa, the aperture ratio is larger than or equal to 80%, the flame retardant property reaches the DIN 4102 B2 level, and the rigid polyurethane foam has good heat preservation performance and voice absorption performance and can be used for preparing plates with voice absorption performance.

The present invention relates to a textile type artificial blood vessel with double-layer warp-knitted stitch structure. It is characterized by that it includes outer layer warp-knitted structure whose water permeability is 1000-3000 ml / sq.cm.min.16kPa and inner layer warp-knitted structure whose water permeability is 250-300ml / sq.cm.min.16kPa, the outer layer warp-knitted structure of said bloodvessel is cord stitch, and the inner layer warp-knitted structure of said blood vessel is tricot stitch. Said invention adopts a two-bar warp-knitted fabric to make the above-mentioned outer layer warp-knitted structure and inner layer warp-knitted structure be combined together so as to obtain the invented artificial blood vessel.

The present invention relates to a textile type artificial blood vessel with double-layer machine-woven structure. It is characterized by that it includes outer layer machine-woven structure whose water permeability is 1000-3000 ml / sq.cm.min.16kPa and inner layer machine-woven structure whose water permeability is 250-300 ml / sq.cm.min.16kPa, and adopts stitching warp or stitching weft to make theabove-mentioned outer layer machine-woven structure and inner layer machine-woven structure be combined together so as to obtain the invented artificial blood vessel.

The technical problem to be solved by the present invention is to provide a high-performance clutch facing for heavy trucks with novel structure, reasonable material formula, balanced performance index, cost and application effect. A high-performance clutch face plate for heavy goods vehicles, which is divided into a friction working layer and a structural layer, the friction working layer includes friction linings of at least three different materials; the three friction linings of different materials include rubber of the same thickness Base friction lining, replacement rubber FA friction lining and ceramic fiber friction lining; the beneficial effects of the present invention are as follows: the structure layer surface of the present invention is provided with rubber-based friction lining, ceramic fiber friction lining and replacement rubber FA The friction lining not only enables the clutch plate to play the characteristics of the three different materials during the clutch operation, but when the clutch plate is used in the clutch mechanism of a heavy-duty truck, it can effectively reduce the fading resistance in high temperature and maintain a stable friction force, especially suitable for Used in heavy goods vehicles.

The invention relates to an aluminum alloy pre-strengthening hot stamping forming method. The W-state aluminum alloy plate after solution quenching is subjected to pre-strengthening treatment in a lower temperature range to obtain hot stamping blanks supplied in batches. Transfer the pre-strengthened sheet material to the hot stamping production line for heating, heat it for 30 seconds to 5 minutes and then carry out the hot stamping process. After pre-strengthening treatment, the hot stamping sheet can form a larger and more stable GP zone structure than the T4 state, so in the subsequent hot stamping process, it is conducive to the transformation of the pre-precipitated structure into a metastable strengthening phase. In addition, the hot stamping process The work hardening effect produced in the process makes the performance of the parts after forming can exceed the T6 state or even approach the T8 state. The process method can effectively improve the production efficiency of hot stamping through the batch supply of pre-strengthened aluminum alloy blanks, and at the same time ensure the performance of the product.

The invention discloses a clutch facing, which consists of a frictional working layer and a structural layer, wherein the frictional working layer is a working face; the back of the frictional working layer is provided with the structural layer; the number of the structural layer can be one or more, and the structural layers can be divided into a heat transfer layer and a support layer according to the action, wherein the heat transfer layer can be used as required; the frictional working layer participates in the friction operation and provides friction and abrasion properties required during using; the structural layer does not participate in the friction operation and provides other auxiliary properties for a clutch facing product; and the whole clutch facing product consists of two ormore layers according to the property requirement. The frictional working layer and the structural layer are combined and thermally pressed to form the clutch facing so as to improve the comprehensive performance thereof and reduce the comprehensive cost.

The invention discloses a folic acid-modified polyvinyl alcohol medicinal polymer material for soluble microneedles and a preparation method thereof. The specific steps of the method of the present invention are as follows: (1) firstly, at a temperature of 90 to 100° C., sodium hydroxide and acrylamide solid are added to polyvinyl alcohol aqueous solution to carry out Michael addition reaction to obtain acrylamide-modified PVA; (2) The acrylamide-modified PVA is dissolved in deionized water, and the activated folic acid aqueous solution is added dropwise under stirring to react in the dark, and then purified by dialysis to obtain the folic acid-modified polyvinyl alcohol material. The yield of the polymer obtained in the present invention is high, the obtained material has good solubility, is favorable for degradation, and the dosage is small, which can reduce the residue of the polymer in the skin after microneedle administration. The microneedles prepared by pouring the lower polymer concentration solution into the microneedle mold have obvious needle shape; the microneedles can penetrate tinfoil, have sufficient mechanical properties, and can be used in transdermal drug delivery systems to achieve a certain drug loading rate. preparation.

A method for preparing a flexible supercapacitor electrode. After dispersing graphene quantum dots in an organic solvent, slowly add them to a polymer precursor solution and use electrospinning to prepare a nanofiber film, and then combine the nanofiber film with carbon Paper and water filter paper encapsulate the electrodes that make up the flexible supercapacitor. The graphene quantum dots prepared by the present invention have abundant functional groups and good dispersion in organic solvents, and the nanofibers prepared on this basis have obvious cross-linked structures; the prepared doped graphene quantum dot nanofibers With sufficient mechanical properties, it can significantly enhance its feasibility as an electrode material for flexible supercapacitors.

The invention discloses a method for manufacturing an artificial blood vessel. The artificial blood vessel is a cylindrical main blood vessel. The method is characterized in that the artificial blood vessel is knitted on a warp knitting machine with double needle beds, the warp knitting machine with the double needle beds is provided with at least four ground guide bars and at least twelve pattern guide bars, two pattern guide bar operating lines are arranged between each two adjacent ground guide bars, and each operating line comprises two pattern guide bars; warp yarns are strung and sleeved together by means of looping knitting actions among looping elements, the ground guide bars and the pattern guide bars, so that two netted platy fabrics comprising loops are formed on the two needle beds of the warp knitting machine; owing to looping knitting actions among the looping elements and the pattern guide bars and swinging actions of the guide bars, and the warp yarns are alternately looped on the two needle beds of the warp knitting machine, so that the two netted platy fabrics are connected with each other to form a fabric of the cylindrical main blood vessel. The method has the advantages that the artificial blood vessel which is knitted by the method has functions of promoting cell tissue ingrowth and preventing blood from permeating from the wall of the vessel during surgery, and the method can be used for knitting various blood vessel structures.

The buckle device (9) for the vehicle hinge (1) includes: a mounting hole (67) for mounting on the pivot (7) of the hinge; a stopper (71) configured to be mounted on the pivot The first steering knuckle (5) of the hinge on the shaft engages, the stopper thus rotatably connects the snap-fit ​​device with the first steering knuckle; and the snap-fit ​​member (73) for the second steering knuckle with the hinge Section (3) is engaged. The first knuckle and the second knuckle are mounted to pivot about the pivot axis between an open orientation and a closed orientation, the snap member being configured to engage the second steering knuckle when in the open orientation. knuckle engagement, thereby rotationally connecting the second steering knuckle and the snap-fit ​​device together. According to the invention, the buckle device does not contain metal material.

The invention relates to an insulated roller profile guide rail assembly. The insulated roller profile guide rail assembly comprises a composite material roller and a guide rail profile; the compositematerial roller comprises a fixed shaft; and the fixed shaft of the composite material roller is fixedly connected with the guide rail profile. The insulated roller profile guide rail assembly is characterized in that the composite material roller further comprises an internal roller and an external roller; the fixed shaft is arranged in a shaft hole of the internal roller; the internal roller isarranged in an internal hole of the external roller; the internal roller is in tight fit with the external roller; the internal roller is injection-molded from a mixed material consisting of glass fiber reinforced nylon and a solid lubrication material, wherein the mass ratio of the glass fiber, the nylon and the solid lubrication material is 20-35:45-70:10-20, and the percentage sum of all components is 100%; and the external roller is injection-molded from high glass fiber reinforced polyamide resin, wherein the content of the glass fiber is 40-60%. The insulated roller profile guide rail assembly has the advantages of high load and low resistance.