Abstract: The present disclosure discloses polyester composites and their preparation methods, and belongs to the technical field of polymer processing and modification. The polyester composites of the present disclosure comprise 65 to 90 parts of polyester, 5 to 35 parts of an elastomer, 0.05 to 3 parts of a chain extender and 0.01 to 5 parts of a functional additive. The polyester composites of the present disclosure not only have ultra-high toughness, but also can maintain high tensile strength, have excellent hydrolysis resistance, can be matched with an antibacterial agent or an antistatic agent to have good antibacterial or antistatic additional functions, can be widely applied to the fields of fibers and fabrics, plastic structural parts, plastic packages or automobile interior parts, and have a wide prospect.

Abstract: A pressure relief valve and an electrolytic capacitor, including: a valve seat, wherein an exhaust passage is formed, an installation groove arranged on the top which communicates with the passage; a blocking cover, movably arranged on the groove between an open and a closed position for opening and closing the passage, a sealing ring arranged between the bottom of the cover and the groove, wherein at least part of the bottom wall forms a guide surface, which extends from the center of the cover radially outward and upward obliquely to the radial edge. The valve can be suitable for the installation of the capacitor to reduce the internal gas pressure therein, maintain the internal gas pressure within a safe range, and at the same time reduce the bulging of the bottom of the capacitor, so that the core package and the bottom are closely attached to achieve effective heat dissipation.

Abstract: A pressure relief valve and an electrolytic capacitor, including: a valve seat, wherein an exhaust passage is formed, an installation groove arranged on the top which communicates with the passage; a blocking cover, movably arranged on the groove between an open and a closed position for opening and closing the passage, a sealing ring arranged between the bottom of the cover and the groove, wherein at least part of the bottom wall forms a guide surface, which extends from the center of the cover radially outward and upward obliquely to the radial edge. The valve can be suitable for the installation of the capacitor to reduce the internal gas pressure therein, maintain the internal gas pressure within a safe range, and at the same time reduce the bulging of the bottom of the capacitor, so that the core package and the bottom are closely attached to achieve effective heat dissipation.

Abstract: The present disclosure discloses polyester composites and their preparation methods, and belongs to the technical field of polymer processing and modification. The polyester composites of the present disclosure comprise 65 to 90 parts of polyester, 5 to 35 parts of an elastomer, 0.05 to 3 parts of a chain extender and 0.01 to 5 parts of a functional additive. The polyester composites of the present disclosure not only have ultra-high toughness, but also can maintain high tensile strength, have excellent hydrolysis resistance, can be matched with an antibacterial agent or an antistatic agent to have good antibacterial or antistatic additional functions, can be widely applied to the fields of fibers and fabrics, plastic structural parts, plastic packages or automobile interior parts, and have a wide prospect.