2629 results about "Polyurethane elastomer" patented technology

A hybrid medical implant having a biocompatible, nonabsorbable core portion and a bioabsorbable textured outer surface portion overlying the core portion. The hybrid implant is useful as a prosthesis for tissue augmentation and/or reconstruction. The core portion of the implant includes a body formed from a nonabsorbable, biocompatible implantable material such as silicone or urethane elastomer. The core portion may be either a solid body, a viscous gel body or a fluid-filled shell. The textured outer surface portion envelops the core portion and presents an irregular, bioabsorbable textured surface to the exterior environment. As a capsule forms around the implant following implantation, the irregular contour of the outer surface of the implant disorients structural proteins in the capsule to impede spherical contraction thereof. Either during the formation of the capsule and/or after the capsule is formed, the outer bioabsorbable surface portion of the implant is absorbed by the body of the host. After bioabsorbtion of the bioabsorbable outer surface portion, the remaining core portion of the implant remains enveloped by the capsule but unattached to capsular tissue. The outer bioabsorbable portion of the hybrid implant may include more than one biocompatible, bioabsorbable material.

A three-piece solid golf ball comprising a rubber-based core inner layer, a rubber-based core outer layer, and a polyurethane elastomer-based cover, wherein the core inner layer has a JIS-C hardness of 50–85, the core outer layer has a JIS-C hardness of 70–90, the JIS-C hardness of the core outer layer at its surface minus the JIS-C hardness of the core inner layer at its center is 20–30, and the cover has a Shore D hardness of 46–55 and a gage of 1.1–2.1 mm is improved in rebound, travel distance, controllability, feel on impact and durability.

The invention discloses a low-density high-hardness microporous polyurethane elastomer and a preparation method thereof; polyester polyol A1, polyester polyol A2, polyester polyol A3, Diol chain extender, crosslinking agent, tertiary amine or organic metal catalysts, organosilicone foam homogenizing agent and water foaming agent are placed in a reactor and then mixed for obtaining a component A; isocyanate, polyester polyol B1, polyether polyol, and side effect inhibitor are placed in the reactor and then reacted for preparing a component B; later, the two components are completely mixed and injected into a mold for being reacted and molded so as to obtain the microporous polyurethane elastomer. The microporous polyurethane elastomer which is produced by the method has the advantages of low density, high hardness, low product shrinkage rate and the like, and can be widely used in production of sole materials such as middle sole, large sole, and the like.

The invention provides a thermoplastic elastomer coated and bonded by nylon, comprising matrix resin, softened plasticizer, adhesion promotor, mineral filler, lubricant and stabilizer, wherein the weight percentage of the material is as follow: resin 20-75%, softened plasticizer 5-45%, adhesion promoter1-30%, mineral filler 0-3%, compatiblizing agent 5-35%, lubricant 0-2%, stabilizer 0-2%. The matrix resin also comprises: thermoplasticity polyurethane elastomer or polymerized silica block amide copolymer, which makes the thermoplastic elastomer with good physical property, in addition a great variety of compatiblizing agents are used, therefore each component fully and mutually dissolves with each other to reduce the occurence of delamination, and the solubility of the composite material to the other engineering plastics, so that the thermoplastic elastomer is firmly adhesive on the surface of the nylon material without any bonding agent by twice injection of plastic jetting-moulding machine or extruder, and coating adhesive on the material such as ABC, PC. The market prospect is increased.

The invention belongs to the technical field of self-repairing elastomer materials, and discloses a high-strength room-temperature self-repairing polyurethane elastomer based on multiple dynamic reversible effects as well as preparation and application thereof. A preparation method comprises the following steps: 1) reacting a dihydric alcohol with a diisocyanate under the action of a catalyst to obtain a prepolymer; wherein the dihydric alcohol is a mixture of more than one from a polyether glycol and a polysiloxane glycol; 2) reacting a dicarboxylic acid chain extender with the prepolymer toobtain an oligomer; adding a diamine chain extender, continuously reacting, and carrying out subsequent treatment to obtain polyurethane; wherein the dicarboxylic acid chain extender and the diamine chain extender are collectively called as chain extenders, and the chain extenders contain disulfide bonds and pyridine groups; 3) in an organic solvent, reacting polyurethane with a metal salt cross-linking agent, and removing the solvent to obtain the high-strength room-temperature self-repairing polyurethane elastomer. The preparation method is simple and mild in condition, and the prepared polyurethane elastomer is excellent in mechanical property and high in self-repairing efficiency and is applied to a flexible substrate materials, wearable equipment and intelligent protective coating.

The invention relates to a thermoplastic polyurethane elastomer and a preparation method thereof. The preparation method comprises the following steps of: mixing polyester polyol, polyether polyol or a mixture of polyester polyol and polyether polyol, organic diisocyanate and micromolecular diol, inputting into a twin-screw premixing unit, shearing and dispersing in axial and radial directions ata high speed for 1 to 2 minutes to make the polymer have certain viscosity and molecular weight, pressing into a co-rotating reactive twin-screw extruder at the temperature of between 180 and 240DEG C, reacting for 2 to 3 minutes, and performing underwater granulation by using a granulator to obtain thermoplastic polyurethane elastomer particles. Compared with the prior art, the invention has a series of advantages that: production equipment investment is small, the process is simple, the process is controlled stably, and the prepared polyurethane elastomer has a few gel points, good appearance and color, good physical and mechanical properties, uniform molecular weight distribution and wide application prospect.

The invention discloses a nanosilicon dioxide modified polyurethane elastomer and a preparation method thereof. The preparation method comprises the steps of enabling polyether glycol, isocyanate and micromolecular dihydroxy alcohol to be subjected to addition polymerization reaction to prepare a polyurethane prepolymer as a component A; uniformly mixing a chain extender, ethyl silicate and a silane coupling agent, carrying out in-situ hydrolysis on ethyl silicate to form nanosilicon dioxide particles, performing surface hydrophobicity modification on the nanosilicon dioxide particles by using the silane coupling agent, and removing a solvent in the mixture to obtain a component B; uniformly mixing the component A and the component B according to a certain ratio, degassing, pouring and carrying out vulcanization molding to obtain the nano-modified polyurethane elastomer. By using the preparation method, the uniform dispersion of silicon dioxide particles in polyurethane is realized, the enhancement effect of nanoparticles is sufficiently taken, the prepared polyurethane elastomer is obtained by crosslinking the nanosilicon dioxide particles, and the heat resistance and chemical stability of the polyurethane elastomer can be remarkably improved; in addition, the nanosilicon dioxide modified polyurethane elastomer can meet the requirements of a sealing element for mechanical strength, wear resistance, high elasticity and oil resistance and has a wide market prospect.

The invention relates to a novel polyurethane-acrylic acid-epoxy resin photosensitive pre-polymer, a synthesis method of the pre-polymer, a high-performance ultraviolet (UV) cured polyurethane modified acrylic acid epoxy resin adhesive prepared from the pre-polymer and application of the UV cured adhesive to bonding of a nylon membrane material and a polyurethane or modified polyurethane elastic body. A method for preparing the photosensitive pre-polymer comprises the following steps of: 1, synthesizing a lower-viscosity epoxy acrylic ester pre-polymer; 2, preparing a pre-polymer of urethane acrylate resin; and 3, mixing or reacting the two pre-polymers in a certain ratio so as to obtain the polyurethane-acrylic acid-epoxy resin photosensitive pre-polymer. A polyurethane-acrylic acid-epoxy resin UV cured adhesive is further prepared by adding a photoinitiator, a photosensitive diluent, a light curing crosslinking agent, other necessary aids and the like.

The invention relates to a polyurethane elastomer shock absorber material and a preparation method. The present invention is formed by the following three components (A), (B) and (C) through the polymerization reaction of two steps. This elastomeric material has excellent mechanical properties and an extremely stable stiffness retention over the temperature range of use. Wherein (A) polymer polyol, (B) polyisocyanate, (C) low-molecular polyol, ammonia chain-extending cross-linking agent, adopted the optimal combination of polyether and polyester in (A), the present invention is used for The application of elastomer cushioning and shock absorption can greatly reduce the volume and weight of equipment shock absorption system components, and solve the problem of polyurethane elastomer material stiffness despite large temperature changes. Biodegradability, thereby expanding the application range of polyurethane materials in elastomer shock absorption.

The invention belongs to the technical field of polymer preparation, and especially relates to a preparation method of a thermoplastic polyurethane elastomer. The method comprises the following steps: 1, putting 1,4-cyclohexyl diisocyanate, polyethylene glycol adipate, 1,4-butylene glycol, a lubricant and a hydrolysis resistance agent in a blender, fully stirring, and fully plastifying in a high-temperature plastifying machine or a high-temperature internal mixer to obtain a thermoplastic polyurethane elastomer matrix; 2, processing an inorganic nanofiller by a silane coupling agent to obtain an modified inorganic nanofiller; and 3, dissolving the thermoplastic polyurethane elastomer matrix in tetrahydrofuran, adding the modified inorganic nanofiller, mechanically stirring, removing tetrahydrofuran, and carrying out film forming to obtain the thermoplastic polyurethane elastomer. Compared with the prior art, the method provided by the invention can effectively increase the heat resistance, the mechanical performances and the ageing resistance of the polyurethane elastomer on the premise that the comprehensive performances of the thermoplastic polyurethane elastomer do not decrease.

The invention discloses a core-shell type ammonium polyphosphate synergetic flame-retardant polyurethane elastic composite material and a preparation method thereof, which is characterized in that the polyurethane elastic composite material containing core-shell type ammonium polyphosphate can be obtained by melting and co-mixing 75-94.9% of polyurethane, 5-25% of core-shell type ammonium polyphosphate and 0.1-5% of synergistic agent at the temperature of 160-220 DEG C for 5-30 minutes by weight percentage. The composite material can ensure that the adding amount of flame retardant is reduced while ensuring the flame retardance effect, and the composite material has good resistance of melt drip, simultaneously improves the shortcoming of poor water resistance of the flame-retardant composite material containing the ammonium polyphosphate, enhances the compatibility of the flame retardant and a polyurethane elastomer and improves the mechanical properties of the material, such as tensile strength, fracture strength and flame retardance performance, thereby meeting the requirements of fire protection safety and engineering applications.

The invention provides a self-repaired organic silicon modified polyurethane elastomer based on disulfide bonds, and a preparation method thereof. The preparation method comprises the following steps: enabling a monomer containing a diisocyanate group to react with active group capped polydimethylsiloxane so as to obtain a polyurethane prepolymer; and further performing reaction with a monomer containing the disulfide bonds, and synthesizing, thereby obtaining the self-repaired organic silicon modified polyurethane elastomer based on the disulfide bonds. The self-repaired organic silicon modified polyurethane elastomer which is modified with organic silicon has improved thermal resistance, water resistance and flexibility, and has high self-repairing efficiency as the disulfide bonds are introduced into a main polymer chain.

The invention discloses a polyurethane elastomer and a preparation method thereof. The method comprises the following steps: evenly mixing polyurethane prepolymer with curing agent, removing foam, casting and curing to obtain the polyurethane elastomer, wherein the curing agent is composed of at least one of chain extender and cross-linking agent, catalyst and other additives. The Shaw hardness Aof the polyurethane elastomer prepared by the invention is 70-90A, the tensile strength thereof is not less than 14MPa, and the elongation at break thereof is not less than 360%; and the polyurethaneelastomer can resist hydrolysis, meets performance requirements for the spiral strake material in the deep-sea riser vortex-excited oscillation suppression device, and has important application value.

The invention belongs to polyurethane elastomeric materials, and particularly relates to a cold-resistant high-wear-resistant polyurethane resin for synthetic leather. The technical scheme is as follows: the cold-resistant high-wear-resistant polyurethane resin for synthetic leather is characterized by mainly comprising isocyanate, polyalcohol compound, reactive silicone oil, alcohol chain extender of which the molecular weight is lower than 150, and solvent. By using the scheme, the invention overcomes the defects in the prior art, and provides a novel cold-resistant high-wear-resistant polyurethane resin for synthetic leather.

The present invention is to the preparation and application of isocyanate based polymers, particularly polyurethane and polyurea elastomeric polymers. By incorporating polybutadiene with a polyether polyol in a polyurethane system, the produced elastomer have improved chemical resistance as compared to conventional polyurethane elastomers. For polyurea elastomer, the incorporation of high functional polyols or crosslinkers with polybutadiene gives elastomer with improved chemical resistance as compared to conventional polyurea elastomers.

The present invention provides a method for producing a thermoplastic polyurethane elastomer having excellent heat resistance and mechanical properties, and capable of obtaining one having a low hardness without using a plasticizer. A method for producing a polyurethane elastomer, which comprises reacting a polyol compound and a polyisocyanate compound, characterized by using, as all or part of the above polyol compound, a polyester ether polyol (A) obtainable by ring-opening polymerization of a mixture of an alkylene oxide and a lactone monomer with an initiator.

The invention relates to polyurethane elastomers, a process for the preparation of these polyurethane elastomers and a the preparation of elastomeric molded parts comprising these polyurethane elastomers. These elastomers comprise the reaction product of a polyol component, chain extenders and/or crosslinking agents, one or more amine catalysts, a catalyst mixture which contains at least one organic titanium compound and at least one organic zinc compound, and optionally an organic lithium carboxylate and/or an organic bismuth carboxylate; with a polyisocyanate component.

The present invention relates to a cushioning laminate insert for a garment shoulder strap, such as a brassiere strap. The cushioning laminate insert of the invention includes: (1) a first outer fabric layer; (2) a central cushioning area of cured polyurethane elastomer cushioning material; and (3) a second outer fabric layer. One surface of the first and second outer fabric layers is laminated with a thermoplastic urethane (“TPU”) film. The laminated surface of the first outer fabric layer is covalently bonded to a first lateral surface of the central cushioning area, and the opposite lateral surface of the central cushioning area is self-adhered to the laminated surface of the second outer fabric layer in an open-sandwich configuration to thereby form the cushioning laminate insert. Garment shoulder straps including the cushioning laminate insert of the invention, as well as methods for making the cushioning laminate insert are also provided.

The invention discloses a microcellular polyurethane elastomer and a preparation method thereof. The elastomer contains two components, i.e., a polyol component and a prepolymer component, wherein the polyol component comprises polyester polyol, a chain extender, a foam stabilizer, water, a catalyst and the like; and the prepolymer component comprises polyester polyol, isocyanate and the like. The polyester polyol in the polyol component is prepared from a mixture of aromatic dibasic acid and aliphatic diacid and a mixture of diethylene glycol and other dihydric alcohols by means of polycondensation reaction. Compared with common microcellular polyester-type elastomers, the prepared elastomer has higher hardness and mechanical properties as well as better abrasive and bending resistances, besides, the flowability of materials is good. The material can be used in the fields like soles, solid tires, buffer blocks and the like. The preparation method is simple and feasible.