33results about How to "Improve heat shrink resistance" patented technology

The invention relates to ultralight graphene rubber foaming colloidal particles for shoe soles. The colloidal particles are prepared from, by weight, 60-65 parts of natural rubber, 8-12 parts of isoprene rubber, 8-12 parts of butadiene rubber, 6-8 parts of butadiene styrene rubber, 0.8-1.0 part of modified graphene, 0.08-0.12 part of poly N-vinyl acetamide, 0.8-1.0 part of silicone oil, 3.0-3.5 parts of inorganic nanoparticles, 1.2-1.5 parts of activated zinc oxide, 0.8-1.0 part of zinc stearate, 1.0-1.2 part of stearic acid, 0.8-1.0 part of a cross-linking agent, 2.0-3.0 parts of a flow assistant and 1.5-1.8 parts of a foaming agent. By adopting the ultralight graphene rubber foaming colloidal particles, the modified graphene is uniformly dispersed in all rubber materials, the rubber foaming colloidal particles have good heat stability, good abrasive resistance performance and good stretching intensity, the permanent compression deformation performance and the heat resistance shrinkage performance are improved, and 50% or above weight can be reduced.

The invention discloses a binder for a lithium ion battery diaphragm, a preparation method and a diaphragm using the same. The binder comprises the following raw materials by weight: 0.5-1 part of a water-soluble polymer, 1-10 parts of a flexible segment monomer, 1-10 parts of a rigid segment monomer, 0.01-0.05 part of an initiator, and 1-10 parts of a plasticizer. The binder for the lithium ion battery diaphragm provided by the invention can be mixed with an inorganic matter to serve as a coating material of the lithium ion battery diaphragm, and the thermal stability and anti-thermal shrinkage performance of the diaphragm can be improved, so that the likely internal short circuit problem caused by poor thermal stability of the existing lithium ion battery diaphragms can be solved, and the diaphragm can have good safety and overcharge tolerance. At the same time, the binder contains polar groups, which can closely bonds with the inorganic matter to improve the wettability and liquid retention of the diaphragm. The flexible segment is introduced while the rigid segment exists, thereby improving the mechanical properties of the binder and guaranteeing the bonding force and the flexibility of the diaphragm.

The invention relates to a flat-plate denitrification membrane for wastewater treatment and a preparation method thereof, belonging to the technical field of wastewater treatment; comprising a non-woven substrate layer and a gas permeable layer; the non-woven substrate layer and the gas permeable layer are bonded In one piece; the non-woven base material includes polypropylene fiber, cellulose fiber and carbon fiber; wherein polypropylene fiber accounts for 60-90wt%, cellulose fiber accounts for 5-30wt%, carbon fiber accounts for 5-15wt%, gas permeability The layer is an expanded polytetrafluoroethylene film. The flat-plate denitrification membrane provided by the invention is a submerged flat-plate membrane with a large specific surface area, which can be directly applied in ammonia nitrogen wastewater without adding a pre-filtering device, and is easy to operate, the membrane is easy to replace, and the cleaning and maintenance are convenient. The flat-plate denitrification membrane of the present invention has a unique physical structure, and the physical structure and functionality are highly matched, the denitrification performance is good, and the index parameters such as contact angle, pore diameter and air permeability are reasonable.

The invention provides a polyolefin resin composite, a preparation method thereof, an insulation material used for a cable, and the cable. The polyolefin resin composite is prepared from the following ingredients: 100 parts by weight of polyolefin, 0.02 to 0.9 part by weight of antioxygen, 1to 10 parts by weight of coupling reagent, 0.5 to 3 parts by weight of initiator and 0.7 to 3 parts by weight of lactam ring compound and / or anhydride compound. The polyolefin resin composite disclosed by the invention conforms to various requirements about the cable in the national standard, insulation thermal shrinkage is especially greatly improved, and a conductor cannot be exposed in air so as to avoid accidental situations including electric leakage, short circuit, fire hazards or electric shock of people and the like. In addition, the preparation method of the polyolefin resin composite is simple and easy in operation and control.

A method for preparing a polyolefin composite diaphragm, comprising: polymerizing methyl methacrylate and γ-methacryloxypropyltriethoxysilane in proportion to form a copolymer, the molecular formula of the copolymer is:, Wherein, m and n are integers; the copolymer is dissolved in the first solvent to form a copolymer solution; the copolymer solution is scraped on the surface of the polyolefin porous membrane and dried, so that the polyolefin porous A gel polymer electrolyte prefabricated layer is formed on the surface and inner pore walls of the diaphragm; and the polyolefin porous diaphragm containing the gel polymer electrolyte prefabricated layer is fumigated in an atmosphere of hydrochloric acid. The invention also relates to a polyolefin composite diaphragm and a lithium ion battery.

A novel polydopamine surface-modified polyethersulfone nanofiber composite membrane for lithium-ion batteries, a preparation method and its application in lithium-ion batteries belong to the technical field of lithium-ion battery materials. The present invention mainly adopts electrospinning method to prepare polyethersulfone nanofiber membrane with high porosity, and then uniformly coats polydopamine on the surface of nanofiber through in-situ polymerization method to prepare polydopamine surface-modified polyethersulfone nanofiber Composite diaphragm. As a result, the composite separator has both structural and performance advantages such as excellent heat resistance, wetting performance, and high porosity. From the perspective of lithium battery separators, the performance of lithium-ion batteries can be improved.

The invention discloses a nanocomposite multi-porous membrane material, which uses polyimide (PI) nanofiber non-woven fabric as a base material, and the pores of the base material are filled with composite nanoparticles; it is characterized in that: the composite The nanoparticles are composed of polytetrafluoroethylene nanospheres (PTFE‑NP) and boron nitride nanoparticles (BN‑NP) in a weight ratio of (7‑12) / (8‑13). The nanocomposite multi-porous membrane material provided by the invention has high temperature resistance, high hardness, moderate porosity, moderate areal density, good ion transport and excellent mechanical properties. The imide nanofiber diaphragm causes the problem of micro-short circuit of the battery due to high porosity; it can solve the serious problem of thermal runaway caused by mechanical collision of power lithium-ion batteries.

The invention discloses a method for preparing a porous carbon heat source material. The method includes the steps that all components and water are primarily mixed through a mixing machine, and then are fed into a screw extruder to continue to be mixed; meanwhile, a foaming agent CO2 is injected into the screw extruder, extrusion molding is conducted after foaming, then drying and cutting are conducted, and the porous carbon heat source material is obtained. According to the method, due to the porous characteristic of a porous carbon heat source, the porous carbon heat source is easy to ignite, full in burning and smooth in thermal flow transferring, and the difficulty, caused by the complex-longitudinal-channel design, of processing molding and reduction, caused by the complex-longitudinal-channel design, of mechanical strength are avoided.