58results about How to "Reduce the amount of filler" patented technology

The invention discloses a polyamide/graphite composite material with high conduction performance and a preparation method thereof. The composite material consists of a polyamide substrate and nanometer graphite and is prepared through in-situ polymerization. The nanometer graphite has high diameter-to-thickness ratio; and an effective conduction network can be formed in a polymer by using little nanometer graphite. With the low content of a conduction filling of the nanometer graphite, a conduction polymer material keeps original good mechanical performance. The volume conductivity of the polyamide/graphite composite material with high conduction performance can reach 8*10S/cm; and compared with a conventional natural graphite and expanded graphite conductive composite material, the polyamide/graphite composite material has excellent properties of low filling amount and high conductivity.

The invention discloses a preparation method of a metal organic framework/water-based anti-corrosive coating. The composite coating is formed by compounding a coordination compound of a metal organic framework (MOFs) and water-borne epoxy resin. As a novel organic hybrid material, the coordination compound of a metal organic framework (MOFs) has high void ratio and adjustability of hole dimension and shape; when the material gets the outside stimulation (such as pressure, light, chemical stimulation of a guest molecule), the framework shape can be changed. The preparation method introduces the metal organic framework material to an anti-corrosive coating system, thus the crosslinking density of the coating can be added, the corrosive particles can be absorbed; besides, the preparation method overcomes the shortcoming of poor barrier property and short anti-corrosive cycle which are generally existed in the water-borne anti-corrosive coating at present, and greatly improve the anti-corrosive performance of the anti-corrosive coating.

The invention discloses a fatigue-resisting natural rubber nano composite material and a preparation method thereof. The preparation method is characterized by comprising the following steps of: carrying out mechanical intercalation on 100 parts of natural rubber and 1-7 parts of nano montmorillonoid, then adding 4-8 parts of vulcanizing activator, 1-4 parts of anti-aging agent, 15-50 parts of carbon black packing, 0.5-3 parts of vulcanizing accelerator and 0.5-3 parts of vulcanizing agent, then adding gelatine into a flat-plate vulcanizing machine, and carrying out mould pressing for 10-30 minutes with the temperature of 135-155 DEG C and the pressure of 10-15MPa to obtain the fatigue-resisting natural rubber nano composite material. The invention substitutes the traditional high-structure carbon black packing by adopting the organic nano montmorillonoid, reduces the thermogenesis of the material under the dynamic loading effect and the same hardness by adopting less packing usage amounts, effectively prevents internal cracks of the material from generating and expanding by utilizing the layered structure of the nano montmorillonoid, and obtains a series of natural rubber materials with excellent fatigue-resisting performance without sacrificing the tensile breaking strength and the breaking elongation ratio of the material at the same time.

This invention discloses a preparation method that high remains water-ground limestone and its application. Add water-ground limestone in water, add sodium polyacrylate dispering agent in water, mix, get water-ground limestone mortar, grind, prepare water-ground limestone mortar, wherein content of less than 2mum is 20-60%; add cationic surfactant in mortar, mix 0.5-3.0 hours, add cationic surfactant in mortar, mix 0.5-3.0 hours, get high remaining water-ground limestone mortar. This high remaining water-ground limestone, which is used as paper fillers, can increase first - pass retention and total retention of bulking agent, and increase fiber retention. It profits to decrease water density, bulking agent dosage, wood pulp dosage, abrasion for papermachine forming fabric, and cost, and protect environment.

The invention discloses an organosilicon composite material and a preparation method thereof. The composite material is prepared from alkylene-containing polysiloxane, hydrogen-containing polysiloxane, epoxide group polysiloxane, a heat-conduction filling material, a hydrosilation catalyst, a reaction inhibitor and the like through mixing and curing. The prepared organosilicon composite material has the characteristics of low content of volatile compounds, resistance to high and low temperature, high heat conduction, light weight, high strength, good cementability, electrical insulating properties, etc., can meet development demands of functional assemblies for large power, microminiaturization, lightweight and high reliability, and is applicable as a badly-needed high-performance heat-conducting insulating material in military fields like aviation, spaceflight and weapons and in fields related to people's livelihood, e.g., an LED illumination system and an electronic circuit integration system.

The invention provides a method for preparing a flexible composite material with low filler content and high electrical conductivity on the basis of a swelling penetration method. The conductive composite material can be applied to the fields of electric heating materials, flexible conductors and the like. The method comprises steps as follows: firstly, cross-linked and cured rubber is swollen in a solvent, the swollen silicone rubber is subjected to water-bath heating ultrasonic treatment in a suspension of CNTs (carbon nano tubes) or graphene, then the composite material is taken out and subjected to ultrasonic cleaning, and finally, the sample is subjected to vacuum drying, wherein the rubber is polydimethylsiloxane, methyl vinyl silicone rubber or methyl phenyl vinyl silicone rubber, the solvent for swelling the rubber is methylbenzene or hexane, and the solvent of the suspension of the CNTs is N,N-dimethylformamide or a mixed solvent of 1-methyl-2-pyrrolidone and water. The prepared silicone rubber conductor has the advantages of high electrical conductivity, low electrical resistivity, low filler content and stress-sensitive, the electrical resistivity at room temperature is as low as 0.55 omega.m, the consumption of the CNTs or graphene is far lower than 0.1wt%, the breaking elongation of the composite material is higher than 300%, and relative electrical resistivity change reaches 1200%.

The invention discloses a preparation method of a flame retardation graphene coating material, and relates to a preparation method of a coating. The method is characterized in that graphene oxide prepared through a Humeers hydrothermal technology is reduced by hydrazine hydrate, organosilane is used as a bridge to connect graphene with epoxy resin through chemical bonds, and a graphene and epoxy resin integrated coating material is synthesized through molecular design. The surface modifying organosilane avoids afresh stacking and aggregation of graphene flakes, so the heat stability and the tensile strength of the graphene and epoxy resin integrated coating material are substantially improved. The integrated functional material improves oxygen index of the tensile strength of the epoxy resin and reduces the heat release rate peak and the total heat release amount, because the integrated coating material can catalyze degradation of the epoxy resin to form a close and porous carbon layer covering the surface of polymer, prevent heat and mass exchange between a gas phase and a solid phase and delay further degradation of the internal material in order to reach the flame retardation purpose of the coating material.

This invention relates to preparation method for nano Al2O3/ polyimide composite material sliding bearing. First sinter one layer bronze power as interlayer on steel plate surface; roll one polyimide layer included nano Al2O 3; by sintering on condition of nitrogen protection, mechanical working adornment and wrapped welding, obtain bearing; wherein, material composed weight per cent is: polyimide 70í½95úÑ, poly 2.5í½15úÑ, nano Al2O3 1.5í½10úÑ and lead power 1í½5úÑ. The product has well mechanical property and frictional behavior, and fit to oil-free lubrication situations of machine, foodstuff, aeronautics and astronautics.

The invention discloses a conductive fluorinated silicone rubber foam composite material, a preparation method thereof and application of the conductive fluorinated silicone rubber foam composite material in the field of gas-sensitive detection. The preparation method comprises the following steps: ultrasonically dispersing carbon conductive particles in an organic solvent which is volatile at normal temperature to obtain conductive particle dispersion liquid; stirring perfluorosilicone oil, hydrogen-containing fluorosilicone oil and conductive particle dispersion liquid in an organic solvent until the organic solvent is completely volatilized, then adding a foaming agent and an inhibitor, performing uniform mixing to obtain a component A, and uniformly mixing perfluorosilicone oil and a platinum catalyst to obtain a component B; mixing the component A and the component B, performing uniform stirring, reacting at room temperature for 5-30 minutes, and crosslinking and curing the obtained product at 50-125 DEG C for 10-60 minutes to obtain the conductive fluorinated silicone rubber foam composite material.

The invention discloses a preparation method of a solid phase extraction column enriched with biogenic amines. The preparation method comprises the following steps that S1, a column pipe of the solidphase extraction column is a pipette superhead, and a lower sieve plate is placed at the bottom of the pipette superhead; S2, the middle portion and bottom of a centrifuge tube cover are drilled vertically, and the solid phase extraction column is fixed into a centrifugal tube after passing through the hole diameter of the centrifugal tube; and S3, the solid phase extraction column is obtained byplacing solid phase extraction packing into the column pipe. The invention further discloses an application method of the solid phase extraction column enriched with the biogenic amines. The application method comprises the steps of pretreatment of samples to be detected, activation of the solid phase extraction column, sample loading, leaching, elution and eluant concentration and drying. The solid phase extraction column prepared by the preparation method compares with a general solid phase extraction column, the amount of packing, the amount of sample treatment and the consumption of an organic solvent are reduced, the time of sample pretreatment is shortened, the cost is saved, and the detection of the biological amines is more convenient and efficient.

The invention relates to a hybrid filler/silicone rubber flexible force-sensitive conductive composite material prepared by a cyclic stretching method and a preparation method of the material. The conductive composite material can be used in the fields of flexible force-sensitive sensing and the like. The method includes adding a carbon nano pipe, a cross-linking agent and carbon fiber into silicone rubber, performing ultrasonic action while stirring; then cross-linking at 100 DEG C for 0.5 hour to form a flexible silicone rubber conductor with hybrid fillers; cutting the sample into splines with length and width of 6cm and 2cm respectively, and then carrying out cyclic tensile relaxation treatment on a universal testing machine, wherein the specific parameters are as follows: strain rangeis 5-50%; and the frequency is 1-10Hz and the cycle number is 100-2000. According to the method, the synergistic effect of the hybrid fillers is utilized to reduce the dosage of the fillers, and thedistribution of carbon materials in the matrix can be adjusted by adopting a repeated stretching method, and thus the conductive network of the fillers can be improved, the orientation of the fillersis promoted to a certain extent, and the resistivity and sensitivity of the composite material are improved.

The invention discloses a combined box-type subgrade without a bottom plate. The combined box-type subgrade comprises two bearing platforms, two lateral walls and a top plate, the top plate is a prefabricated concrete plate, and the lateral walls are prefabricated concrete walls; the two lateral walls are parallel to each other, the top plate is located on the bearing platforms, and the two vertical ends of both of the lateral walls are spliced with the two bearing platforms and the top plate correspondingly to form a hollow box body without the bottom plate. The invention further discloses asubgrade construction method. The subgrade construction method comprises the following steps: a foundation is treated, specifically, pipe piles or cast-in-situ bored piles are arranged in the foundation; the subgrade is laid, specifically, a first section of the subgrade is laid firstly, the concrete bearing platforms are poured on the foundation or the prefabricated bearing platforms are laid onthe foundation, the pile ends of the pipe piles or the pile ends of the cast-in-situ bored piles are anchored into the bottoms of the bearing platforms, then the lateral walls are connected with the bearing platforms, and then the top plate is fixed; and the subgrade laying step is repeated to lay other sections of the subgrade sequentially until laying is completed. According to the combined box-type subgrade without the bottom plate, land resources can be saved, the construction time of railway subgrade engineering can be shortened, and the construction cost of the railway subgrade engineering can be reduced.

The invention discloses a preparation method of a mica paper with high thermal conductivity. The preparation method comprises following steps: step one, picking mica: removing disqualified raw materials, and picking mica sheets with an area not greater than 10 cm2 and a thickness not greater than 2 cm; step two, preparing mica slurry: uniformly delivering mica sheets picked in the step one to a high pressure hydraulic grinding machine, grinding, filtering, grading, and dehydrating to obtain fine mica slurry; step three, preparing a highly conductive filler solution: adding water into a filler to dilute the filler and stirring the filler by a stirring machine; step four, papermaking: using a rotary screen mica papermaking machine to carry out papermaking, wherein rotary screen sizing is performed for five times, and each time, after rotary screen sizing, the highly conductive filler solution prepared in the step three is sprayed on the mica paper; and step five, dehydrating and drying: after spraying, carrying out dehydrating and drying to obtain the mica paper with high thermal conductivity. The prepared mica paper with high thermal conductivity has the advantages that the using amount of fillers is small, the fillers are uniformly distributed, the thermal conductive performance is strong, the mechanical properties are good, and the service life is long.

The invention relates to a functional composite adopting a core-shell structure and a preparation method of the functional composite, in particular to a butylbenzene particle/graphene/aluminum composite with high electromagnetic shielding performance and a preparation method thereof. Composite particles of the composite take graphene-coated nanoscale butylbenzene particles as a core structure andan aluminum film layer as a core shell, wherein the content of the graphene-coated nanoscale butylbenzene particles is 90vol%-98vol%, the content of metal aluminum is 2vol%-10vol%, and the content ofgraphene in the composite particles is not lower than 0.05vol%. By preparation of the composite particles adopting the multilayer structure, the electrical conductivity and electromagnetic shielding performance of the composite can be significantly improved and the specific gravity of the material can be reduced under the condition of low-content aluminum metal and trace graphene, and the purposesof low specific gravity, high conductivity and high electromagnetic shielding performance are achieved.

The invention relates to a bridge and culvert structure transition section anti-frost-heaving structure in a cold region. The portion between the connecting portions of a side wall of a transverse building and a roadbed is filled with an anti-frost structural layer in a built manner. The longitudinal profile of the anti-frost structural layer is almost in a right trapezoid shape with the upper portion narrower than the lower portion. The longitudinal right-angle side of the trapezoid of the anti-frost structural layer faces the side wall of the transverse building. The longitudinal profile of the anti-frost structural layer is designed in the trapezoid with the upper portion narrower than the lower portion, the anti-frost-heaving effect can be guaranteed, meanwhile, materials are saved to the maximum extent, and the structure is low in construction cost, scientific and reasonable.

The invention discloses a construction method of a local U-shaped underflow wetland for utilizing multi-phenological plants to enhance agricultural runoff denitrification and belongs to the technicalfield of sewage treatment. The method aims to solve the problems in existing low-carbon-nitrogen-ratio agricultural runoff underflow wetland treatment technologies that the addition of carbon sourcesis difficult to control, the cost of carbon supply fillers is high, wetland treatment systems are complex and large in occupied area, and the denitrification effect is influenced by nonuniform distribution of carbon sources of wetland plants. According to the method, in the construction process of the underflow wetland, a plurality of U-shaped depressions different in size and depth are constructed in a mode of loading fillers or not loading the fillers. A plurality of phenological perishable submerged plants and floating plants are arranged in the depressions, and a plurality of phenologicalemergent aquatic plants are arranged on the surface of the wetland, so that the plants in the wetland have different phenological configuration characteristics in different levels, and the uniform distribution of plant carbon sources in the wetland is enhanced. The constructed wetland has the advantages of adjusting the carbon-nitrogen ratio of agricultural runoff, consuming few fillers and beinghigh in denitrification efficiency and resistant to hydraulic impact.

The invention discloses a recycling and reusing method of pulping deinking sludge. The recycling and reusing method includes three units which are concentration treatment of deinking sludge, use of deinking sludge after concentration, and waste water treatment of deinking sludge concentration. The concentration treatment of deinking sludge is carried out by collecting the deinking sludge after floating selection to a sludge storage tank, and adding macromolecular agglomeration in the sludge storage tank under a stirring state; after the sludge is agglomerated to be particle, conveying the sludge mixture to a sludge extruding dewatering system, concentrating and dewatering the sludge; the use of deinking sludge after concentration is carried out by re-feeding the deinking sludge after partially concentration to a pulping system of a white-faced craft paper; directly delivering the rest concentration deinking sludge to a power station to incinerate; the waste water treatment of deinkingsludge concentration is carried out by making waste water generated from the deinking sludge concentration enter a white water circulating system to purify; recycling the waste water. The recycling and reusing method of pulping deinking sludge can safely and effectively treat the deinking sludge, save waste paper raw material amount and filler dosage, reduce the sludge disposal load, and reduce the production cost.