45results about How to "Low filler content" patented technology

A resin composition which has low stress, and good adhesive property in high temperature and high moisture environments and which is useful in adhesive applications in low stress, high moisture sensitivity level electronic packages. Preferably, a flexible epoxy anhydride adduct modified solid bismaleimide and solid benzoxazine resin composition that can survive high temperature and high moisture conditions and maintain good adhesion strength and minimize the stress resulting from a coefficient of thermal expansion mismatch between a silicon die and a substrate which is Ball Grid Array solder mask or a smart card polyethylene terephthalate or silver or copper metal lead frame.

A polyurethane-graphite oxide composite material or nano composite is described, containing graphite oxide in expanded form present optionally, together with a phyllosilicate in expanded form in a polyurethane matrix, a method for the preparation of this composite material as well as its use as a fire retardant or as a flame-retardant seal for openings and/or bushings in walls, floors and/or ceilings of buildings.

Provided is a pneumatic tire which is improved in a rolling resistance and a ride comfort in normal running without damaging a run flat durability.

It is a pneumatic tire provided with a bead core, a carcass layer, a tread rubber layer, an inner liner, a side reinforcing layer and a bead filler, characterized by using a rubber composition (a) which contains (A) a rubber component and (B) a filler and which has a dynamic storage modulus (E′) of 10 MPa or less at a dynamic strain of 1% and 25° C. and a Σ value of 5.0 or less in a loss tangent tan δ at 28 to 150° C. in the physical properties of the vulcanized rubber.

The invention provides a high-strength high-thermal-conductivity nylon composite material and a preparation method thereof. The nylon composite material is prepared from the following raw materials in parts by weight: 100 parts of nylon resin, 5-30 parts of carbon fibers, 10-30 parts of thermal conductive filler, 0.1-5 parts of a dispersing agent and 0.1-5 parts of an antioxidant, the nylon resin is composed of 5-30% of graphene nylon master batch and 70-95% of pure nylon resin; and carbon nanotubes are grafted on the surfaces of the carbon fibers. According to the invention, high-thermal-conductivity fillers such as graphene and carbon nanotubes are pretreated and then subjected to melt blending, so that the fillers are well dispersed and a thermal conduction path can be constructed at a low content, the thermal conductivity of the composite material is remarkably improved, and the carbon fibers are added into the matrix, so that the overall mechanical property of the material is improved, the dimensional stability is improved, and the water absorption rate of the nylon is reduced.

The invention relates to a highly thermal-conductive aluminum-based copper-clad plate. Three layers of glue are arranged between a copper foil and an aluminum plate, namely a copper foil, a first layer of glue, a second layer of glue, a third layer of glue and the aluminum plate are arranged, wherein the content of a filler in the second layer of glue is greater than that of a filler in the first layer of glue or the third layer of glue; the grain size of the filler in the second layer of glue is greater than that of the filler in the first layer of glue or the third layer of glue. The three layers of glue are skillfully combined together; the advantages of the three layers of glue are fully displayed; the aluminum-based copper-clad plate manufactured by using the method not only has ultrahigh thermal conductivity but also has high peeling strength and excellent thermal stress and voltage resistance.

The invention discloses a preparation method of a three-layer gradient GIS/GIL supporting insulator, which aims at reducing the electric field intensity of an insulator along a surface or a local region as an optimization target, and solves the optimal spatial distribution of a dielectric constant in the supporting insulator by using a variable density algorithm. According to the optimization result, the dielectric constant change area is divided into a dielectric constant transition area and a high dielectric area, the combination contour of the dielectric constant transition area is extracted, and then a hollow dielectric constant transition area with a support and a resin sprue gate is generated through photocuring 3D printing; a thermocurable high-dielectric composite material is prepared by adopting a high-dielectric filler/polymer blending mode, and then the high-dielectric composite material is poured into the dielectric constant transition area and integrally put into a metal mold for fixing; and a thermocurable high-dielectric composite material is prepared in a low-dielectric filler/polymer blending mode, then the thermocurable high-dielectric composite material is poured into a metal mold, and the three-layer gradient GIS/GIL supporting insulator can be obtained after curing is completed in vacuum.

The invention discloses a preparation method of a carbon fiber felt/silver nanowire/polyvinylidene fluoride composite material, which specifically comprises the following steps: mixing an ethyl alcohol solution with a silver nanowire solution to obtain a silver nanowire/ethyl alcohol solution; dissolving polyvinylidene fluoride particles in N,N-dimethylformamide to carry out a water bath reactionso as to obtain a polyvinylidene fluoride/N,N-dimethylformamide solution; soaking the flexible carbon fiber felt in a silver nanowire/ethyl alcohol solution; putting the carbon fiber felt into a culture dish pasted with a polytetrafluoroethylene film, drying the carbon fiber felt, repeating the operation for nine times, then soaking the carbon fiber felt in a polyvinylidene fluoride/N, N-dimethylformamide solution, then putting the carbon fiber felt into the culture dish pasted with the polytetrafluoroethylene film, and drying the carbon fiber felt to obtain the carbon fiber felt/silver nanowire/polyvinylidene fluoride composite material. The method provided by the invention is simple in process and high in safety, can meet the application requirements of various electronic products, and realizes low filler content, relatively large shielding layer thickness and high electromagnetic shielding performance at the same time.

Prepeg for manufacturing a fibre-reinforced composite material, the prepreg comprising a layer of dry fibres and a layer of resin material adhered to a surface of the layer of dry fibres, the resin material having a plurality of particles dispersed therein, the particles have an average particle size that is larger than the average fibre separation of the layer of dry fibres.

The invention discloses an opaque multi-layer container with light shielding, of the type produced by blowing a preform or by injection-blowing, preferably intended to contain photosensitive substances, which includes at least two layers of thermoplastic material with opacifying materials dispersed in the layers of the thermoplastic material, said thermoplastic material being polyethylene terephthalate (PET) in all of the layers and including, in at least one of the layers, aluminium metal (Al) and a light absorbent as opacifying material dispersed in the thermoplastic matrix. The invention that is presented provides the main advantage of being able to achieve practically total protection at any wavelength of the light spectrum, with much lower filler levels than those conventionally used to date.

The invention discloses an antistatic leather finishing agent as well as a preparation method and application thereof, and belongs to the technical field of leather finishing. According to the preparation method, a hydrophobic Ti3C2 nanosheet is used, dopamine is self-polymerized to generate polydopamine to modify the surface of the hydrophobic Ti3C2 nanosheet, an amphiphilic Ti3C2 nanosheet is prepared, and the amphiphilic Ti3C2 nanosheet is introduced into a film-forming agent to be blended, so that the antistatic leather finishing agent is prepared. The method is simple in preparation process, can further reduce the cost, and is easy for large-scale production. In a film forming process of the antistatic leather finishing agent, the amphiphilic Ti3C2 nanosheet moves towards the upper surface along with evaporation of water to form a self-layering structure, so that the surface resistivity of leather can be effectively reduced when the content of fillers is relatively low, a coatingwith good antistatic performance and excellent mechanical performance can be obtained, and the defect that the mechanical property of the composite material is reduced due to excessive fillers is avoided. Therefore, the antistatic leather finishing agent has great application potential in the fields of electrician gloves, flexible electronic devices and the like.

The invention relates to a carbon-based aqueous composite coating material, which is prepared from the following raw materials: sodium hydroxide, sodium chloride, anhydrous sodium carbonate, sodium silicate, sodium dialkyl sulfonate and an anticorrosive coating material. According to the present invention, six carbon nanometer fillers are added to an industrial aqueous anticorrosive coating material by using a solution blending method, high-speed stirring and ultrasonic dispersion treatment are performed to prepare a composite coating material, the infrared spectrum of the composite coating material is tested, the components of the composite coating material are analyzed, an aluminum foil is coated with the composite coating material to prepare a coating, the surface morphology and the cross-section morphology of the coating are characterized by a scanning electron microscopy, the surface wettability and the corrosion resistance are tested, and the infrared spectrum shows that the group structure of the coating material cannot be changed by adding a small amount of the carbon nanometer fillers, wherein the carbon nano-tube content before the oxidation is 0.2 wt%, the content of theother carbon fillers is 0.4 wt%, and the corrosion resistance of each composite coating is optimal.

The invention discloses a preparation method of a graphite-oriented thermal interface material. The preparation method comprises the following steps: mixing raw materials of the graphite-oriented thermal interface material to obtain a mixture; carrying out orientation treatment on the mixture to obtain a lamellar mixture; freezing the lamellar mixture to obtain a frozen lamellar mixture; cutting the frozen lamellar mixture to obtain a lamellar sample with specified width and length, and laminating the lamellar sample; treating the laminated sample by adopting a vacuum pressurizing mode, and conducting slow heating in the process so as to convert the mixture from a solid state to a viscous flow state, thereby obtaining a compact sample preform; carrying out high-temperature curing treatment on the compact sample preform to obtain a cured sample; and cutting the cured sample along a direction vertical to the thickness of the lamellar sample to obtain the graphite-oriented thermal interface material. The graphite-oriented thermal interface material prepared by the preparation method is high in compactness and small in thermal resistance.

The invention discloses a polymer-based insulation thermal conduction composite. The composite is a composite which is of a particular double-percolation structure and formed through alternative arranging of a polymer-based/conductive thermal conduction filler premixed object, 2(n+1) conductive thermal conduction layers formed through molten plasticizing and n-time layered overlapping of polymer-based/insulation thermal conduction filler premixed objects, and an insulation thermal conduction layer or a composite which is formed through alternative arranging of 2(n+1)+1 conductive thermal conduction layers and an insulation thermal conduction layer. The outmost end of the material is the insulation thermal conduction layer. The invention further provides a preparing method of the composite.In the composite, polymer and filler do not need to be particularly treated, the preparing method is simple in process, operation and control are convenient, production efficiency is high, productioncost is low, and the wide industrialization and market prospects are achieved.