5results about How to "Small permanent deformation" patented technology

The application discloses an ultrahigh molecular weight polyethylene-acrylonitrile butadiene rubber composite elastic material, which comprises 70wt%-95wt% of ultrahigh molecular weight polyethylene and 5wt%-30wt% of acrylonitrile butadiene rubber powder, has an island-sea structure, wherein the acrylonitrile butadiene rubber powder is a dispersed phase, the ultrahigh molecular weight polyethylene is a continuous phase, and the dispersed phase and the continuous phase are connected by C-C chemical bonds; and the particle size of the acrylonitrile butadiene rubber powder is less than or equal to 0.7mm. By limiting the content of the ultrahigh molecular weight polyethylene and the acrylonitrile butadiene rubber powder, combining the connection between the two phases by C-C chemical bonds and limiting the particle size of the acrylonitrile butadiene rubber powder, the rubber particles in the composite elastic material are first deformed when the composite elastic material is subjected to external force, so that the composite elastic material has good resilience and lower permanent deformation at a smaller strain.

This invention belongs to the field of polymer sealing materials technology, specifically relating to a modified PTFE sealing material, its preparation method, and its application. The modified PTFE sealing material provided by this invention comprises the following components: polytetrafluoroethylene resin, bronze powder, nano-carbon materials, polyimide micropowder, potassium titanate whiskers, graphite, coupling agent, and lubricant. The modified PTFE sealing material provided by this invention exhibits high wear resistance, extremely low wear rate, excellent creep resistance, good self-lubrication, and thermal conductivity, enabling it to maintain excellent performance under various operating conditions (high-speed, high-temperature, and extreme-pressure conditions), thus extending the service life of the sealing components.

The invention discloses a silica gel-based material with high biocompatibility and elasticity as well as a preparation method and application of the silica gel-based material. The silica gel-based material with high biocompatibility and elasticity is prepared from bio-based polyurethane and polyether modified siloxane. According to the preparation method, modified polypyrrolidone is taken as a chain extender, glycidyl is taken as an end-capping reagent, a polycaprolactone prepolymer is subjected to chain extension and end capping, bio-based polyurethane is prepared, and the bio-based polyurethane is enhanced through polyether modified polysiloxane, so that the biocompatibility of a silica gel-based material is effectively improved; the tensile property and the compressive deformation resistance of the material are also improved. The silica gel-based material disclosed by the invention can be used for preparing medical catheters or thrombus simulants, and is applied to interventional operations.

This application relates to the textile field, specifically disclosing a thermal insulation fabric and its production method. The thermal insulation fabric comprises, from the outside in, a PTFE garment film, an adhesive layer, a polyethersulfone / polyurethane mixed fiber wadding, a hollow PBT core-sheath composite fiber layer, an adhesive layer, and a polyurethane / zirconia aerogel composite fiber layer. The polyurethane / zirconia aerogel composite fiber layer is woven from polyurethane / zirconia aerogel composite fibers, which have a core-sheath structure. It is prepared by coaxial wet spinning of the sheath solution and the core solution, followed by impregnation in a tert-butanol aqueous solution, pre-freezing, and freeze-drying. The sheath solution is a polyurethane solution, and the core solution is a polyurethane solution containing zirconia aerogel powder, with a mass ratio of zirconia aerogel powder to polyurethane of 0.2-0.3:1. The thermal insulation fabric of this application has the advantages of good thermal insulation effect, high mechanical strength, high compression resilience, and relatively fluffy texture.

[Problem] The object of the present invention is to provide polyurethane elastic fibers with excellent fabric properties and stability of fabric properties over time, achieved by including a specific polyurethane in the polyurethane elastic fibers, the specific polyurethane having a salt structure in its molecular structure in which specific functional groups are ionicly bonded to each other; and to provide a method for producing such polyurethane elastic fibers. Another object of the present invention is to provide a polyurethane elastic fiber that allows for easier fiber inventory control and processing condition management during use, and can be used to obtain fabrics with stable fabric properties and fabric quality; and to provide a method for producing such polyurethane elastic fibers. [Solution] A polyurethane elastic fiber comprising polyurethane A and additive B. Polyurethane A: A polyurethane using a polymeric diol, diisocyanate, and chain extender as starting materials and not containing a tertiary amine in the backbone. Additive B: A polyurethane or polyurea using a diol and / or diamine and diisocyanate as starting materials and having a tertiary amine nitrogen bonded only to non-aromatic carbons in the backbone, the tertiary amine nitrogen being ionicly bonded to a sulfonic acid compound to form a sulfonic acid amine.