752results about How to "Low moisture absorption" patented technology

The invention provides a production method of a stable enhanced type solid wood profile improved by a wood carbonization and acetylation process, which belongs woodwork production technique. The production method comprises the following steps of: a, drying treatment, wherein the wood moisture content is reduced to be as low as 5.0 to 8.0 percent, the moisture content deviation in the wood thickness is less than 2.0 percent, and the wood internal residual stress is less than 2.0 percent; b, carbonizing treatment; c, acetylation treatment; and d, equalization treatment. The invention also discloses a stable enhanced type solid wood profile prepared by the production method. The solid wood profile prepared by the method is stable, has high corrosion resistance and weathering resistance, high output, long product service life and wide utilization ways, is favorable for realizing flow line production, and is convenient for industrialization.

The invention discloses a spherical silicon dioxide/polyimide composite film and a method for making the same as well as an application. The method for making the spherical silicon dioxide/polyimide composite film comprises the following steps that: 1) spherical silicon dioxide particles are scattered into an organic solvent evenly to obtain the spherical silicon dioxide particle suspension liquid; 2) a surface treatment agent, a molecular weight modifying agent, an auxiliary adhesive, a flatting agent and aromatic series diamine are dissolved inside the spherical silicon dioxide particle suspension liquid; organic dicarboxylic anhydride is added to be stirred in order to obtain a spherical silicon dioxide/polyamide acid mixing resin solution; 3) the mixing resin solution is coated on the surface of a flat substrate and is heated up to make the solvent volatilize and complete the imide reaction to obtain the spherical silicon dioxide/polyimide composite film. The spherical silicon dioxide/polyimide composite film has good mechanical property, good corona resistance, low thermal coefficient of expansion and low moisture absorption ratio, and has important application value in an insulating system of a frequency conversion speed motor.

The invention provides a cigarette core material for heating incombustible cigarettes. The cigarette core material is prepared from the following components in percentage by weight: 10-50% of tobaccofiber and tobacco powder, 5-30% of wood pulp fibers, 5-30% of one or more of hemp fibers, bamboo fibers, soybean fibers, cocoon fibers, cotton fibers, polylactic acid fibers and modified cellulose fibers, 10-50% of tobacco essence, 10-30% of smoke producing agent, 1-10% of heat conduction material, 1-10% of phase change absorption material and 1-20% of paper coating component which is selected from one or more of a hydrophobic material, a microcapsule suspension and an essence suspension containing the tobacco powder. According to the cigarette core material, the heat conduction material is added, so that the heat can be uniformly conducted; the cigarette core paper is uniformly heated in the heating process; in addition, the phase change absorption material is used and is capable of achieving phase change and absorbing heat under the heated condition so as to prevent the cigarette core material paper from being locally overheated in the heating process.

The invention discloses a weatherable irradiation crosslinking cable material. Raw materials of the cable material comprise the following components, by weight, 100 parts of a thermoplastic elastomer, 0-35 parts of an engineering plastic, 2-80 parts of a polyolefin, 0.2-8 parts of a crosslinking agent, and 2-150 parts of a fire retardant. According to the invention, problems existing in manufacturing of cable materials from polyester copolymers are solved through reasonably designing the components and the ratio of the components, and utilizing the interaction of the components; and the prepared cable sheath material has the advantages of good processing fluidity, good mechanical properties, oil resistance, high temperature resistance, excellent hot extensibility and superior low temperature resistance after irradiation crosslinking, and substantial reduction of the material cost through the addition of the polyolefin interface phase solvent.

The invention relates to a manufacturing method of an electronic-grade polyimide film with low linear expansion coefficient. The method is characterized by comprising the steps that (1) the step-by-step condensation polymerization technology or the blending compounding technology is used for obtaining two or more polyamide acid glue solutions comprising rigid structures and soft structures at the same time and are different in rigidity and softness; (2) ultrafine inorganic whiskers, like zinc oxide whiskers, silicon carbide whiskers and zirconium tungstate whiskers, which are subjected to surface organic modification already and/or nanoparticle materials are smashed and cavitated through high-energy-density supersonic waves, and then the functional fillers are compounded with polybasic polyamide acid in an in-situ micro-nano mode; (3) the compounded glue solutions are subjected to filtration, vacuum defoamation, extrusion casting filming, chemical amidization or thermal amidization, infrared complete amidization, high-temperature thermal forming processing, corona processing and a reeling process, and therefore the electronic-grade polyimide film with the thickness being 7.5-125 micrometers, the linear expansion coefficient being 5-18ppm/DEG C, and good physical mechanical performance is obtained.

The invention discloses enhanced high-temperature heat treated wood and a manufacturing method thereof. The manufacturing method comprises the following steps that 1, high-temperature heat treatment is performed, wherein man-made forest wood serves as raw materials, and high-temperature heat treatment is performed on the man-made forest wood to obtain heat treated wood; 2, impregnation enhancing treatment is performed, wherein the heat treated wood obtained by the step 1 is impregnated in resin adhesives to obtain impregnated wood; 3, solidification forming treatment is performed, wherein solidification forming treatment is performed on the impregnated wood obtained by the step 2 to obtain the enhanced high-temperature heat treated wood. According to the manufacturing method, not only can the mechanical properties of the wood be improved, but also the size stability of the wood can be improved, green and environmental protection are achieved, and the prepared enhanced high-temperature heat treated wood takes the man-made forest wood as the raw materials and is high in mechanical strength and good in size stability.

The invention discloses a wood-plastic composite for walls, comprising the following components by mass: 68-78 parts of wood flour, 20-25 parts of PE plastics, 2-4 parts of coupling agents, 0.1-0.2 part of antioxidant and 2-5 parts of precipitated calcium carbonate-silicone oil. The invention also discloses a preparation method of the wood-plastic composite for walls. The quantity of the PE plastics in the formula of the wood-plastic composite is 20-25%, which is half as much as 50% of plastics in the common wood-plastic material, thus greatly saving the plastics and lowering the production cost, meanwhile, the prepared wood-plastic composite has the characteristics of high strength, creep resistance, good processability, low moisture rate and high weatherability.

A liquid epoxy material for packaging high-density microelectronic devices is prepared from two kinds of liquid epoxy resin, acid anhydride as solidifying agent, solidifying promoter, silane as coupling agent and two kinds of inorganic filler. Its advantages are high purity, flowability and high-temp resistance, and low viscosity and expansibility.

A method of manufacturing an insulating sheet, a method of manufacturing a copper clad laminate, and a method of manufacturing a printed circuit board, as well as a printed circuit board manufactured using these methods are disclosed. The method of manufacturing an insulating sheet can include: forming a thermoplastic reinforcement material, which includes fibers secured by a thermoplastic polymer binder, and in which pores are formed; forming a thermoplastic resin layer such that the thermoplastic reinforcement material is impregnated with a thermoplastic resin; and hot pressing the thermoplastic reinforcement material and the thermoplastic resin layer. This method can be utilized to manufacture an insulating sheet, which has a low rate of moisture absorption and superb electrical properties, including a low dielectric constant (Dk) and low dielectric loss (Df), and in which the fibers can readily be impregnated with the resin.

The invention relates to an object storage device and a refrigerator with the object storage device. In particular, the object storage device comprises a drawer and a sealing device, and the sealing device is arranged to singly seal the drawer or arranged to be matched with an object storage room of the refrigerator to seal the drawer. Specially, the object storage device further comprises a humidity adjusting device which is installed in the sealing device and comprises an adjusting part and a switching part, wherein the adjusting part comprises a moisturizing module used for improving or keeping the humidity in the drawer and a drying module used for reducing the humidity in the drawer; and the switching part is arranged to enable at least a part of moisturizing module or at least a part of drying module to be exposed in the internal space of the drawer in an operationable manner, so that the drawer works in the moisturizing mode or the drying mode. In this way, the dry and wet multiplex aim of the internal space of the drawer can be achieved. In addition, the invention further provides the refrigerator with the object storage device, and the dry and wet multiplex drawer is provided for the refrigerator.

A plasticizer-containing film of polyvinyl acetal having a softening temperature Tg of less than 74° C. contains at least one cyclohexane dicarboxylic acid ester as a plasticizer. The plasticizer-containing films have a low tendency for sweating of the plasticizer, and are useful in producing laminate safety glasses and photovoltaic modules.

A capacitor and a method of making a capacitor, is provided with improved reliability performance. The capacitor comprises an anode; a dielectric on the anode; and a cathode on the dielectric wherein the cathode comprises a conductive polymer and a polyanion wherein the polyanion is a copolymer comprising groups A, B and C represented by Formula A_xB_yC_z as described herein.

The invention discloses sulfur-free ring stabilizing agent propellant powder which consists of the following components in parts by weight: 70 parts of an oxidant, 34 parts of a burnable agent, 6 parts of an adhesive, 2 parts of a stabilizing agent, 2 parts of an anti-aging agent, 1 part of a catalyst and 2 parts of an antismoke agent which are uniformly mixed according to a general method, wherein the oxidant is a mixture consisting of potassium perchlorate, amine perchlorate and barium nitrate; the burnable agent is a mixture consisting of potassium hydrogen terephthalate, potassium acid phthalate, nitrocellulose, purified terephthalic acid and hemp stem carbon powder; the stabilizing agent adopts calcium stearate; the anti-aging agent adopts calcium phthalate; the catalyst adopts copper oxide; the antismoke agent adopts aluminum hydroxide; the adhesive is selected from one or a mixture of multiple of phenolic resin, strong adhesive powder, glutinous rice flour and polyvinyl alcohol according to any ratio. The sulfur-free ring stabilizing agent propellant powder is high in power capability and excellent in safety performance indexes and has excellent storage stability, and the environment-friendly performance is greatly improved.

The invention discloses a preparation method of flux cored wires, particularly a preparation method of flux cored wire employing wet-mixing sintered medicinal powder, using a cold rolling steel belt as the sheath raw material of a flux-cored wire, using rutile and sintered power as main flux cored welding flux, rolling the steel belt into a U-shaped groove through longitudinal cutting, power matching and flux power drying of the steel belt, and filling welding flux in the U-shaped groove, and the steel belt is rolled and combined into an O-shaped pipe blank and further rolled and drawn into finished wires of phi 0.8 to phi 2.4 mm. The invention reduces the specific surface area of the powder, decreases moisture absorption of the powder, simultaneously has the advantages of simple and reliable process and low cost, and is worth of popularization.

The invention designs a high barrier PVA alloy capable of being processed with a thermoplasticity method. specifically speaking, through various monolayer or multi-layer thermoplasticity processing extrusion processing devices, the alloy is made into various high barrier films containing the alloy comprising a monolayer film, a multi-layer extrusion film, a high temperature retort film, a two-way stretch film and a thermo shrink film, hollow containers comprising a car oil tank, a bottom and a barrel, various tubular products comprising a fuel oil or oil delivery pipe and a gas pipe, various sheets and all high barrier products made from the material. The product made form the material has excellent chemically resistant performance, oil resistance, solvent resistance, transparency, processing stability, high barrier performance for various gases, aroma protection property, tensile strength and elongation at break.

A new brominated epoxy resin has been developed, which consists of following components:A. multifunctional phenol-benzaldehyde epoxy resin (formula 1) 10~70 weight %;B. difunctional epoxy resin 0~55 weight %;C. bromine-containing difunctional epoxy resin 0~20 weight %;D. tetrabromobisphenol-A epoxy resin 15~40 weight %;The synthesis is that (D) tetra bromo bisphenol-A reacts with at least one of (A), (B)and (C), then adding the rest of (A),(B) and (C) and mixing them uniformly, the new brominated epoxy resin produced, which can be applied to glass fiber laminate, and showing proper reactivity and a broad working window. The laminate possesses high Tg and good heat resistance, and applying to electron material with high performance.

Disclosed is a flame retardant thermoplastic resin composition that includes about 100 parts by weight of a mixed resin (A) including about 10 to about 90 wt % of an aromatic polyamide resin (A-1) and about 10 to about 90 wt % of a polyphenylene sulfide resin (A-2), about 0.5 to about 30 parts by weight of a phosphinic acid metal salt flame retardant (B), and about 10 to about 100 parts by weight of a filler (C).

The invention discloses a low smoke zero halogen waterproof high temperature resistant anti-corrosion armored cable which comprises a cable body, insulation wire cores, an insulation layer, a shielding layer and an outer sheath. A plurality of conductors are arranged in the cable body, an insulation wire core is arranged in each conductor, and a PVC plastic connection rod is arranged on the outside of the conductors. A current guide core is arranged at the center position of the cable body, an insulation layer wraps the conductors, a filler is arranged in a gap between the insulation layer and the conductors, a shielding layer is arranged on the outside of the insulation layer, a water-resisting layer and the armored layer wrap the shielding layer from the inside to the outside in an extruding mode, a stainless steel wire weaving layer is arranged on the outside of the armored layer, a heat insulation layer, an inner sheath and an outer sheath wrap the stainless steel wire weaving layer from the inside to the outside, a plurality of ground wire cores arranged in symmetry are evenly arranged in the heat insulation layer, and a graphite layer is arranged between the outer sheath and the inner sheath. The conductors are connected through the PVC plastic connection rod, so that the cable body is stable in use, service performance of the cable body is improved, and the service life is prolonged.