3results about How to "Improve fatigue durability" patented technology

The utility model relates to a kind of plate spring lug bush structure, belong to automobile field, including first bush (1) and second bush (2), the first bush (1) includes first sleeve (3) and is equipped on first sleeve (3) first flange (4), first flange (4) is equipped with first boss (5), the second bush (2) includes second sleeve (6) and is equipped on second sleeve (6) second flange (7), second flange (7) is equipped with second boss (8).First sleeve (3) and second sleeve (6) are connected by lug pin shaft (9), first lug pressing plate (10) and second lug pressing plate (11) are respectively equipped at the both ends of lug pin shaft (9), boss on flange face surface, can prevent flange face edge stress concentration and the effect of interference fastening, improve the fatigue endurance of lug bush, reduce the risk of cracking.

The application discloses an antibacterial bio-based polyamide elastomer and a preparation method thereof. The preparation method comprises the following steps: preparing a polyamide prepolymer containing a tertiary amine structure through ring-opening polymerization reaction of caprolactam, N-diethyl-aminocaprolactam and sebacic acid, then reacting with polytetramethylene ether glycol to form a polyamide-polyether block copolymer elastomer, and further modifying the polyamide-polyether block copolymer elastomer through reaction with a halogenated hydrocarbon to realize quaternary ammonium modification, so that the quaternary ammonium salt antibacterial group is stably introduced into the polymer molecular structure in a covalent manner. The bio-based polyamide elastomer prepared by the application has excellent elastic properties and persistent and stable quaternary ammonium antibacterial properties, the antibacterial components are not easy to migrate and lose, the preparation process is simple and controllable, is suitable for the field of functional materials, and has a good application prospect.

An object of the present invention is to provide a two-pack type curable adhesive composition that can provide high fatigue durability and high damping performance in a compatible manner. The present invention provides a two-pack type curable adhesive composition including a base (A) containing a urethane prepolymer (a1) having an isocyanate group, and a curing agent (B), at least one of the base (A) or the curing agent (B) containing polymer particulates (X) having an average particle size of from 0.01 to 200 µm, the polymer particulates (X) having a glass transition temperature of from -40°C to +80°C, a content of the polymer particulates (X) being 5 mass% or greater in a total amount of the two-pack type curable adhesive composition, a cured product (P) obtained by curing the two-pack type curable adhesive composition having a loss tangent of 0.15 or greater under conditions of a temperature region of from -40°C to +80°C and a frequency of 100 Hz, and the cured product (P) not breaking under conditions of a stress amplitude of 2.8 MPa and a repetition number of up to 107 times in a tensile shear fatigue property test in accordance with JIS K6864.