7results about How to "Improved thermal dimensional stability" patented technology

The invention discloses a lithium battery organic-inorganic composite flame-retardant diaphragm which comprises a base material diaphragm and a flame-retardant layer on the outer side of the base material diaphragm, the base material diaphragm is a polyolefin diaphragm, and the flame-retardant layer is prepared from benzoxazine resin particles, natural clay mineral nanotubes and auxiliaries; the mass ratio of the benzoxazine resin particles to the natural clay mineral nanotubes is (40%-95%): (5%-60%). According to the present invention, the design is novel, the thermal stability and the flame retardant property of the polyolefin diaphragm in the lithium battery are effectively improved, the affinity of the polyolefin diaphragm to the electrolyte is improved, and the safety of the battery monomer is substantially improved.

The application relates to the field of high polymer material and film processing technology, in particular to a forming and processing technology of a biaxially stretched polymer film; the technology comprises the steps of inorganic particle surface modification, esterification, polycondensation, melt extrusion casting and biaxial stretching and winding; the technology combines specific monomer copolymerization to provide main chain rigidity and steric hindrance, and cooperates with multifunctional crosslinking monomers to build a slightly long branched and micro-crosslinked structure in the system; the core is to introduce an end group reaction agent and a macromolecular antioxidant to close the polar end group to inhibit degradation, and to combine the surface modified nanoparticles with the monomer containing a sulfonate group to form a polar ion aggregate in the amorphous region; the application overcomes the defects that the traditional process lacks a main chain rigidity cooperative design and an end group closing mechanism, causes a significant increase in thermal shrinkage and a decrease in dielectric performance in a high temperature and high frequency scene, improves the thermal dimensional stability of the material, and improves the dielectric breakdown strength and the surface metal layer adhesion.

The invention discloses a polyimide film with low CTE and high glass transition temperature and a preparation method thereof. The preparation method of the polyimide film comprises the following steps: S1, preparing a polyamide acid solution; s2, adding a catalyst and a dehydrating agent into the polyamide acid solution in the step S1, uniformly mixing, coating on a substrate, and drying and imidizing to obtain a polyimide film with low CTE and high glass transition temperature; the polyamide acid solution is prepared by reacting tetracarboxylic dianhydride and diamine in an organic solvent. The glass transition temperature (Tg) can reach 330 DEG C or above, the coefficient of thermal expansion (CTE) is 40 ppm / DEG C or below, the yellowness index is not larger than 3, the transmittance at 550 nm is not smaller than 88%, the haze is not larger than 1.0%, and the optical film can serve as an optical film in the fields of display substrates, liquid crystal displays (LCDs), organic light-emitting diodes (OLEDs) and the like and has high application value.

The invention belongs to the technical field of graphene, and particularly relates to a graphene oxide and resistance wire compounded flexible heating pad. The resistance wire is used as a main heating body to provide a basic heat source, and meanwhile, an efficient three-dimensional heat conduction network is constructed through the graphene modified layer. The network not only can quickly and uniformly disperse heat generated by the resistance wire, but also can convert part of heat energy into far infrared radiation with the wavelength of 6-14 microns. By means of the composite heat transfer mode, the overall electric-heat conversion efficiency is greatly improved, reaches 95% or above and is far better than that of a traditional resistance wire heating pad (60-70%), and electric energy is effectively saved.

The utility model relates to a glass fiber internally-reinforced polymer cross laminated film and a self-adhesive waterproof coiled material. The glass fiber internally-reinforced polymer cross laminated film comprises a cross laminated film surface layer, a glass fiber non-woven fabric layer and a cross laminated film bottom layer which are sequentially laminated. The glass fiber non-woven fabric layer is arranged between the cross laminated film surface layer and the cross laminated film bottom layer, so that not only can the heat resistance of the traditional cross laminated film be improved, but also the strength and the puncture resistance can be improved. The glass fiber non-woven fabric internally-reinforced polymer cross laminated film is used for preparing a self-adhesive waterproof coiled material, so that the thermal dimensional stability of the waterproof coiled material can be effectively improved, the problems of shrinkage, swelling, separation of overlapping edges and the like of the coiled material in an external alternate cooling and heating or sunlight environment are avoided, and the flatness and appearance quality of a product can be remarkably improved; and the reliability of the overlapping edge of the waterproof roll is improved.

The invention belongs to the technical field of capacitor films, and relates to a polypropylene capacitor film and a preparation method and application thereof. The polypropylene capacitor film comprises a layer C, a layer B, a layer A, a layer B and a layer C. The layer A comprises, by mass, 94-98 wt% of polypropylene and 2-6 wt% of an olefin block copolymer; the layer B comprises the following components in percentage by weight: 98.5 to 99.5 percent of polypropylene and 0.5 to 1.5 percent of olefin block copolymer; the layer C is prepared from 87 to 98.7 weight percent of polypropylene, 1 to 10 weight percent of aliphatic-aromatic polycarbonate and 0.3 to 3 weight percent of compatilizer; the content of the olefin block copolymer is gradually reduced from the A layer to the B layer, and the C layer is not added with the olefin block copolymer. The prepared polypropylene capacitor film has excellent high and low temperature breakdown field strength and low thermal shrinkage rate, and meets the use requirements of high-end electric power equipment.

The application belongs to the field of lithium ion batteries, and particularly relates to a crosslinked organic-inorganic composite nanomaterial modified solid-state polymer electrolyte and a preparation method thereof. The electrolyte composition comprises a polymer matrix, a lithium salt and super-crosslinked organic-inorganic composite fillers. The super-crosslinked organic-inorganic composite fillers are super-crosslinked nanoparticles with a core-shell structure, which are obtained by a Friedel-Crafts reaction using an organic-inorganic copolymer as a reaction monomer. The electrolyte is obtained by uniformly stirring the super-crosslinked organic-inorganic composite fillers, the polymer matrix and the lithium salt in a solvent, and then casting and drying under anhydrous and oxygen-free environment. The solid-state polymer electrolyte has high ionic conductivity and other excellent electrochemical properties, and can be used in a wide temperature range.