247results about How to "Low water absorption" patented technology

The invention relates to the technical field, and particularly discloses a nano-modified epoxy building thermal insulation material and a preparation method thereof. The nano modified epoxy building thermal insulation material is prepared from the following raw materials in parts by mass: 80 to 120 parts of Portland cement, 20 to 40 parts of slag powder, 5 to 10 parts of hollow mesoporous silicon dioxide, 0.1 to 1 part of pyrrole, 0.1 to 0.2 part of ammonium persulfate, 5 to 10 parts of nano silicon dioxide, 10 to 15 parts of bisphenol S epoxy resin, 1 to 5 parts of acrylic acid, 1 to 2 parts of polylysine, 0.01 to 0.1 part of catalyst and 1 to 2 parts of curing agent. The concrete is prepared from the following raw materials in parts by weight: 20-30 parts of epoxy resin, 4-8 parts of loaded aerogel, 0.1-1 part of polycarboxylate superplasticizer, 1-4 parts of composite fiber and 0.2-1.25 parts of hydrogen peroxide. The fireproof building material has excellent toughness, can better resist cracking and absorb energy, effectively avoids cracking and damage under the action of thermal stress, and ensures that the building material has a fireproof effect.

The invention discloses a carbon-coated sodium ferrous sulfate phosphate positive electrode material as well as a preparation method and application thereof. The carbon-coated sodium ferrous sulfate phosphate positive electrode material is square flaky particles formed by coating sodium ferrous sulfate phosphate with a conductive carbon material and irregular aggregates of the square flaky particles. The molecular formula of the sodium ferrous sulfate phosphate is Na (6-2x + y) Fex( SO4) (3-y) (PO4) y, x is more than 0 and less than 3, and y is more than 0 and less than or equal to 0.5. The invention also discloses a preparation method and application of the carbon-coated sodium ferrous sulfate phosphate positive electrode material. The positive electrode material has the advantages of phosphate and sulfate positive electrode materials, the voltage platform is high, the conductivity is excellent, the air stability is good, and the assembled battery has excellent chemical sodium storage performance, high discharge specific capacity, highly reversible charge-discharge reaction and good cycle performance. The method is simple in process, high in feasibility, low in raw material cost and easy to realize industrial production through a solution system.

The invention provides a polymer, a preparation method thereof, a positive pole piece, a secondary battery and an electric device. The polymer comprises a structure as shown in a formula I, X comprises a phosphate group or a phosphite group, R1 and R3 respectively and independently comprise at least one of a polyether chain segment, a polyester chain segment, hydrogen and alkyl, and at least one of R1 and R3 comprises the polyether chain segment or the polyester chain segment; and R2 comprises an organic chain segment. According to the polymer provided by the invention, the flexibility of a pole piece can be improved while the maximum solid content of positive electrode slurry is effectively improved, the filtering time is shortened and the production efficiency and quality of the pole piece are improved.

The invention provides a superfine light-weight high-strength filler and a preparation method thereof, and belongs to the technical field of fillers. The filler is prepared from the following components in parts by weight: 30 to 100 parts of quartz sand, 1 to 10 parts of cullet, 1 to 15 parts of Al2O3, 7 to 15 parts of Li2O, 2 to 8 parts of P2O5, 1 to 12 parts of ZrO2, 3 to 6 parts of composite nucleating agent, 5 to 10 parts of carbonate, 10 to 20 parts of feldspar and 2 to 5 parts of sulfate. The preparation method comprises the following steps: mixing the quartz sand, the cullet, the Al2O3, the Li2O, the P2O5, the ZrO2 and the composite nucleating agent, melting at a high temperature to obtain a base material, nucleating and crystallizing at different temperatures, grinding, adding the carbonate, the feldspar and the sulfate, adding the binder, granulating, and sintering to obtain the product. The lightweight high-strength filler has the characteristics of sound absorption, noise reduction, fire prevention, flame retardance, light mass density, high compressive strength, low water absorption, ecological environmental protection and the like, and is suitable for lime, gypsum and cement-based products; particularly, the high-temperature-resistant and high-strength dry-mixed mortar has a good application prospect in dry-mixed mortar products, such as ceramic tile adhesives, light plastering and self-leveling, as well as acoustic boards, sound insulation barriers, heat insulation boards and fireproof board products.

The invention belongs to the technical field of resource recycling, and discloses lead-zinc tailing ceramsite and a preparation method thereof. The lead-zinc tailing ceramsite is mainly prepared from the following raw materials in parts by mass: 100 parts of lead-zinc tailings; 20 to 30 parts of limestone tailings; 6-8 parts of active mullite nano powder; 1-3 parts of glass micro powder; and 8-12 parts of dry sludge powder. The invention also provides a preparation method of the lead-zinc tailing ceramsite. The lead-zinc tailings are used as main raw materials to prepare the lead-zinc tailings ceramsite, through compounding of the lead-zinc tailings and the limestone tailings, the synergistic effect of the lead-zinc tailings and the limestone tailings is achieved, resource utilization of the lead-zinc tailings and the limestone tailings is achieved, and good economic benefits and social benefits are achieved. The density grade of the ceramsite prepared by the invention is 600-900, the cylinder compressive strength is 6.8-9.8 MPa, the water absorption rate is 9.4-11.4%, and the ceramsite has relatively good strength and relatively low water absorption rate.

The invention relates to the technical field of degradable flowerpots, in particular to a plant fiber mould pressing flowerpot and a manufacturing method of the plant fiber mould pressing flowerpot. 10 to 20 parts of a composite binder; wherein the plant fiber comprises at least one of straw and wheat straw, and the length of the straw and the wheat straw is 5-10 mm; the composite binder comprises the following components in parts by weight: 60-80 parts of modified urea-formaldehyde resin; 15 to 25 parts of epoxy resin; according to the plant fiber flowerpot, the plant fiber flowerpot with the height of 15 cm or above is successfully manufactured, and the industry blank is filled up; balanced strength distribution from bottom to top is achieved through fiber orientation and gradient density forming. The composite binder system obviously reduces the water absorption rate of the flowerpot and prolongs the service life of the product; the degradation speed is accurately controlled by regulating and controlling the ratio of the plant fibers to the binder.

The invention relates to the technical field of EVA (Ethylene Vinyl Acetate) hot melt adhesives, and discloses a hot melt adhesive, a preparation method thereof and an application of the hot melt adhesive in a card protecting film. The preparation method comprises the following steps: adding EVA resin, EVA-based polyurethane and an antioxidant into a reaction kettle, heating, stirring and melting, then adding a plasticizer, an auxiliary agent and a tackifier, and cooling to obtain the hot melt adhesive. The EVA-based polyurethane contains an EVA molecular chain, so that the polyurethane and EVA resin have better compatibility, a better toughening effect is achieved, the shear strength and the elongation at break of the hot melt adhesive are improved, the EVA-based polyurethane contains a hydrophobic fluorine-containing alkyl chain, the hydrophobicity of the polyurethane is improved, the hydrophobicity of the hot melt adhesive is improved, and the hot melt adhesive has a good application prospect. The water absorption rate is reduced, and better water resistance is shown. Good practical application is realized in the aspects of card protecting films and the like.

The present invention relates to the technical field of EVA, and discloses a preparation method of a wear-resistant modified EVA foamed sole material, ethylene-vinyl acetate copolymer, POE grafted microcrystalline cellulose, ethylene propylene diene monomer rubber, auxiliary agent, filler, cross-linking agent, foaming agent are placed in an open mill, and molded foaming is carried out in a flat vulcanizer after mixing to obtain a wear-resistant modified EVA foamed sole material. POE can play the role of a compatibilizer, improve the interface compatibility between microcrystalline cellulose and EVA, improve the tensile strength, elongation at break and tear strength of the foamed material, and reduce the relative volume wear amount, improve wear resistance. And reduce water absorption, improve the water resistance and waterproof performance of the foamed sole material.

The invention discloses a green low-carbon functional coal gangue lightweight aggregate, and belongs to the technical field of lightweight aggregates for buildings, the coal gangue lightweight aggregate comprises the following raw materials by weight: 86.4-89.1 parts of coal gangue, 9.6-9.9 parts of fly ash, 1-4 parts of a pore forming agent, and 6-7 parts of a water glass solution; the pore-forming agent is composed of calcium carbonate, manganese dioxide and a lanthanum-zirconium metal organic framework, and the mass ratio of the calcium carbonate to the manganese dioxide to the lanthanum-zirconium metal organic framework is 1: 1: (1-2); according to the invention, the industrial solid waste coal gangue is used as a main raw material, the fly ash is used as an auxiliary raw material, and the pore-forming agent is used, so that the lightweight and high-strength coal gangue lightweight aggregate is obtained, the utilization rate of the coal gangue is more than 80%, and a new path is provided for large-scale resource utilization of the solid waste coal gangue and high-performance preparation of the lightweight aggregate.

The invention belongs to the technical field of composite cross arm inner insulation core bodies, and particularly relates to a composite insulation cross arm core body rod and a preparation method thereof. The composite insulation cross arm core body rod comprises a polymer resin and hollow microsphere composite core body and a fiber cloth reinforced polymer resin matrix composite layer, and the fiber cloth reinforced polymer resin matrix composite layer is laid on the outer surface of the polymer resin and hollow microsphere composite core body in an oriented mode. The fiber cloth reinforced polymer resin-based composite layer and the polymer resin and hollow microsphere composite core body are subjected to vacuum infiltration through resin and are cured into a whole; the polymer resin and hollow microsphere composite core body is a composite material core body formed by curing resin and hollow microspheres. Compared with a solid composite core body, the composite insulation cross arm core body rod has the advantages that the weight is low, meanwhile, the composite core rod prepared through a vacuum infiltration process is compact in structure, and dye permeation, water diffusion and dielectric strength of materials are superior to those of composite material core rods formed through a pultrusion process.

The invention discloses a preparation method of an MOFs reinforced bacterial cellulose membrane as well as a product and application of the MOFs reinforced bacterial cellulose membrane, an in-situ growth method, a polymerization method and a chemical cross-linking method are combined, an MOFs material grows in the cellulose membrane, then modification is performed by using poly (diallyldimethylammonium chloride) with different concentrations and 1, 2, 3, 4-butanetetracarboxylic acid with different concentrations, and the MOFs reinforced bacterial cellulose membrane is obtained. A series of alkaline anion exchange membranes based on bacterial cellulose are synthesized. The prepared cross-linked membrane has good durability under various extreme conditions, relatively low swelling rate and water absorption rate, high conductivity and high mechanical strength, and when the prepared cross-linked membrane is assembled into a flexible zinc-air battery (F-ZAB), the excellent power density of 282.4 mWcm <-2 > can be obtained at room temperature.

The invention discloses a high-heat-resistance low-dielectric non-flowing prepreg and application thereof. The prepreg comprises a curable resin insulating layer and a reinforcing material, the curable resin insulating layer comprises the following components in parts by weight: 10-50 parts of epoxy resin I; 20 to 80 parts of cyanate ester resin; 20 to 60 parts of a core-shell rubber premixed solution; 5 to 40 parts of cyclic polyolefin; the core-shell rubber premixed liquid is a mixed dispersion liquid of epoxy resin II, an organic solvent and core-shell rubber, and the content of the core-shell rubber is 10-50% in percentage by mass; the epoxy resin, the cyanate ester, the core-shell rubber premixed liquid and the cyclic polyolefin are matched, and the cyclic polyolefin is introduced to adjust the compatibility among the components and greatly improve the dielectric property, so that the resin composition with excellent low dielectric property, heat resistance, non-flowability and low water absorption is obtained; the method is used in the field of non-flowing prepregs with high heat resistance and low dielectric requirements.

The invention provides an acoustic compatibilization material, a preparation method thereof, a loudspeaker module and electronic equipment. The acoustic compatibilization material comprises a living carrier and a COF material, wherein the living carrier is provided with mesopores and macropores; the COF material is loaded and / or embedded in the pore structure of the living carrier; the COF material is provided with three-dimensional pore channels with the pore diameter not smaller than 0.4 nm, and the pore channels are communicated with one another. The COF material has good binding force with the living carrier, so that the mechanical property of the living material can be improved, and the water absorption rate of the living carrier can be greatly reduced. The invention also provides a preparation method of the acoustic compatibilization material, and the preparation method comprises the following steps: immersing a living carrier in a solution of a COF material precursor, and crystallizing to obtain the acoustic compatibilization material, the method does not comprise a roasting step. The acoustic compatibilization material provided by the invention has a hierarchical pore structure, has a relatively good acoustic compatibilization effect, and can effectively improve the low-frequency effect of a loudspeaker.

The utility model relates to the technical field of hydraulic engineering, in particular to a hydraulic engineering pipeline device. Comprising a mounting assembly, a connecting assembly, a protection assembly and an engineering pipeline, the mounting assembly comprises a mounting ring seat and a bolt, the connecting assembly comprises a first connecting seat, a second sealing layer and a second connecting seat, the protection assembly comprises a wear-resistant layer, the inner ring of the first connecting seat is connected with a protection pipe, and the inner ring of the wear-resistant layer is provided with a compression-resistant layer. A supporting layer is arranged on the inner ring, away from the wear-resistant layer, of the compression-resistant layer, and a damp-proof layer is arranged on the inner ring, away from the compression-resistant layer, of the supporting layer. The supporting layer is arranged and used for supporting the compressive layer and the damp-proof layer at the same time, and the damp-proof layer has the characteristics of resistance to polar solutions and chemicals and low water absorption rate and is used for damp-proof protection of the engineering pipeline, so that the influence of damp of the use environment on the engineering pipeline is reduced, and the service life of the engineering pipeline is prolonged. And the use of the engineering pipeline in a humid environment is ensured.

According to the fluorine-containing polyimide resin and the epoxy resin adhesive based on the fluorine-containing polyimide resin, 2-trifluoromethyl-4, 4 '-diaminodiphenyl ether containing-CF3 is used as a raw material, and dianhydride containing a flexible group and dianhydride containing a rigid group are subjected to proportion optimization and compounding to synthesize the fluorine-containing polyimide resin. And mixing the epoxy resin with tetrafunctional epoxy resin, bifunctional epoxy resin and a curing agent to obtain the epoxy resin adhesive. According to the fluorine-containing polyimide resin, the glass transition temperature of the adhesive can be increased, the heat resistance of the adhesive is enhanced, meanwhile, due to the fact that the fluorine-containing polyimide resin contains-CF3, the solubility of the fluorine-containing polyimide resin in an epoxy system can be increased, and the water absorption rate and the dielectric constant of the adhesive are reduced.

The invention relates to the technical field of adhesives, and discloses an environment-friendly water-based adhesive and a preparation method thereof. The water-based adhesive prepared by the preparation method disclosed by the invention is prepared from the following raw materials in parts by weight: 20 to 30 parts of polyethylene glycol adipate glycol, 3 to 8 parts of modified polyacrylic acid, 13 to 18 parts of isophorone diisocyanate, 3 to 6 parts of a modified chain extender, 0.005 to 0.02 part of a catalyst, 0.2 to 0.5 part of propylene glycol, 0.1 to 0.3 part of triethylamine, 3 to 6 parts of acetone and 50 to 70 parts of deionized water. The waterborne polyurethane adhesive is synthesized by adding auxiliaries such as modified polyacrylic acid and a modified chain extender, so that the adhesion, heat resistance, water resistance and the like of the adhesive are improved, and meanwhile, the waterborne polyurethane adhesive has certain environmental protection performance.

The invention belongs to the technical field of water treatment materials, and particularly relates to a coal gasification slag unfired ceramsite filter material as well as a preparation method and application thereof. The coal gasification slag thermal insulation material comprises the following raw materials in parts by weight: 67.5-95 parts of coal gasification slag, 5-15 parts of active powder, 0-20 parts of metakaolin, 2-8 parts of expanded perlite, 0.1-0.5 part of a foam stabilizer and 1-3 parts of a foaming agent. The unfired ceramsite filter material has the advantages of being reusable, green and environment-friendly in preparation process, low in follow-up treatment cost, capable of being reused after failure and the like.

The invention relates to the technical field of epoxy molding compounds, in particular to a low-stress low-hygroscopicity epoxy resin composition and application thereof. The low-stress low-hygroscopicity epoxy resin composition is prepared from the following components: epoxy resin, phenolic resin, inorganic filler, a coloring agent, a release agent, a curing accelerator, an ion trapping agent and a coupling agent, the epoxy resin is composed of o-cresol formaldehyde type epoxy resin and branched diphenyl sulfide epoxy resin, and the branched diphenyl sulfide epoxy resin is obtained by crosslinking 4, 4 '-dihydroxy diphenyl sulfide, inositol and epichlorohydrin; by adding the branched diphenyl sulfide epoxy resin into the epoxy resin composition, the mechanical property and the water absorption rate of the epoxy resin composition are remarkably improved, so that the stability and the reliability of a product are improved, and the epoxy resin composition can be used for packaging small and thin integrated circuits.

The invention provides a waterproof and anti-cracking two-in-one rendering coat mortar composition, and relates to the technical field of building coatings. The waterproof and anti-cracking two-in-one rendering coat mortar composition is prepared from the following raw material components in percentage by weight: more than or equal to 35 percent of cement, more than or equal to 2.5 percent of dispersible rubber powder, more than or equal to 50 percent of sand, more than or equal to 1 percent of a defoaming agent, 0.3 to 0.6 percent of anti-cracking fiber, 0.15 to 0.3 percent of a water reducing agent, 0.45 to 0.65 percent of a water repellent, 0.1 to 0.4 percent of cellulose and 0.3 to 0.6 percent of a thixotropic agent. Preferably, the raw material component can also comprise active kaolin. The rendering coat mortar composition disclosed by the invention has waterproof and anti-cracking properties, and a waterproof mortar working procedure in outer wall construction can be omitted.

The present invention discloses a recycled aggregate preparation device based on water jet crushing of waste concrete, comprising a high-pressure water pump, a longitudinal high-pressure water jet pipeline, a transverse high-pressure water jet pipeline, a recycled aggregate collection plate and a recycled aggregate grading mechanism; the outlet of the high-pressure water pump is respectively connected to the longitudinal high-pressure water jet pipeline and the transverse high-pressure water jet pipeline, and the port of the longitudinal high-pressure water jet pipeline is connected with a longitudinal high-pressure nozzle; the waste concrete block is located above the recycled aggregate collection plate, the port of the transverse high-pressure water jet pipeline is connected with a transverse high-pressure nozzle, the transverse high-pressure nozzle is located on one side of the recycled aggregate collection plate, and the recycled aggregate grading mechanism is located below the other side of the recycled aggregate collection plate. The beneficial effects of the present invention are: the present invention can strip aggregates from waste concrete and waste reinforced concrete and perform particle grading, and prepare concrete with different properties according to different levels of recycled aggregate.

The application discloses a kind of composite super-hydrophobic paper based on alkyl ketene dimer and metal polyphenol network and preparation method thereof, belong to functional paper-based material field.The method is first immersed in 0.25%~5% alkyl ketene dimer emulsion in cellulose paper, is dried at 90~110 DEG C and is cured 48-96h to prepare modified paper;Then, the pH is 8.0-9.0 of tris-hydroxymethyl aminomethane hydrochloride buffer solution, hydrochloric acid dopamine is dissolved in the buffer solution to form dopamine solution, and the concentration is 0.25~20mg / mL of metal ion solution;Finally, the modified paper is immersed in dopamine solution and metal ion solution in turn, and is dried to obtain composite super-hydrophobic paper.The obtained composite super-hydrophobic paper uses cellulose paper-based material as substrate, and hydrophobic layer and metal polyphenol network layer are formed on the surface in turn, the composite paper has super-hydrophobic performance, water barrier performance and photo-thermal response performance, the preparation process is simple, and is suitable for waterproof packaging, self-cleaning surface, anti-icing and deicing and photo-thermal antibacterial and other fields.

The present invention provides a resin composition and its application. The resin composition comprises the following components by weight: 10 to 70 parts of a modified maleimide compound, 10 to 75 parts of a polyphenylene ether containing an unsaturated group, and 5 to 30 parts of a crosslinking agent having a structure represented by Formula I in the molecular structure. The resin composition significantly reduces the planar thermal expansion coefficient and water absorption rate of the resin composition through the synergistic compounding of the components, increases the glass transition temperature of the resin composition, and can still maintain low dielectric properties after absorbing water, so that the resin composition fully meets the performance requirements of high-frequency and high-speed printed circuit boards and electronic equipment.

The invention relates to the field of muck resource utilization, in particular to a multi-layer flexible mucky soil-based regenerated composite board and a preparation method and application thereof.The preparation method includes the steps that S1, polyethylene film blocks and a mucky soil solidified premix containing polyethylene fibers and mucky soil particles are prepared; s2, a layer of polyethylene film block is placed in the mold, then a layer of glue is brushed on the polyethylene film block, then a layer of mucky soil solidification premixed material is laid to form a premixed material layer, a layer of glue continues to be brushed on the premixed material layer, the operation is repeated in the mold to form prefabricated multi-layer composite boards which are alternately arranged from bottom to top, and the prefabricated multi-layer composite boards are formed; the uppermost layer and the lowermost layer of the prefabricated multi-layer composite board are both polyethylene film blocks; s3, repeatedly performing needling operation on the prefabricated multi-layer composite board, and then leveling to form a multi-layer composite board with fibers entangled layer by layer; and S4, the multi-layer composite board is cured, and hot pressing is conducted after curing is completed. Compared with the prior art, the application range of the sludge is enriched.

The invention discloses a preparation method of a slow-release foaming cement-based grouting material, and belongs to the technical field of building materials. The slow-release foamed cement-based grouting material comprises the following raw materials in parts by mass: 800-900 parts of a cementing material, 100-200 parts of heavy calcium carbonate powder, 5-15 parts of a foaming agent, 4-6 parts of a catalyst, 8-10 parts of calcium stearate, 0.1-0.2 part of a foam stabilizer, 0.1-0.5 part of a coating agent, 1-5 parts of a water reducing agent, 0-0.5 part of a coagulant, 0-8 parts of an early strength agent, 0-5 parts of polypropylene fibers, 2-10 parts of redispersible latex powder and 300-350 parts of water. The slow-release foaming cement-based grouting material disclosed by the invention can react and foam after slurry is stirred and grouting is completed, so that the early strength of the material can be improved, and the requirement of rapid repair of a road can be met.

The invention provides a low-water-absorption glass bead modified PBT (polybutylene terephthalate) material and a preparation method thereof. The low-water-absorption glass bead modified PBT material comprises the following components in parts by weight: 70-100 parts of PBT resin; 0 to 30 parts of solid glass beads; 0-5 parts of a toughening agent; 0-2 parts of an antioxidant; 0-2 parts of a lubricant; 0-2 parts of black color master batch; 0-2 parts of a coupling agent; 0-5 parts of polytetrafluoroethylene wax; wherein the average particle size of the solid glass beads is 1-50 [mu] m; the average particle size of the polytetrafluoroethylene wax is 3-15 [mu] m, and the weight-average molecular weight of the polytetrafluoroethylene wax is 10000-30000 g / mol; the weight ratio of the solid glass beads to the polytetrafluoroethylene wax is (5-10): 1. According to the invention, the polytetrafluoroethylene wax is added into the solid glass bead modified PBT material, so that the shrinkage difference between the material flow direction and the vertical flow direction is effectively reduced, the water absorption rate of the material is remarkably reduced, the preparation process is simple, and the production process is easy to control.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a novel environment-friendly artificial leather material and a preparation method thereof. The preparation method comprises the following steps: putting polyvinyl chloride (PVC) resin into a mixing machine, sequentially adding dioctyl phthalate, calcium carbonate and zinc stearate, stirring for 5-10 minutes, adding the starch-TiO2 mixed sol into the mixing machine, and continuously stirring for 20-30 minutes; then the mixed material is conveyed into an internal mixer to be heated and plasticized, and the plasticizing time is 5-10 min; finally, melt extrusion is conducted, artificial leather is prepared through a calender and cured for 3 min through 400 mJ / cm < 2 > ultraviolet rays, a novel environment-friendly artificial leather material is obtained, and compared with original starch-based artificial leather, the novel environment-friendly artificial leather is low in water absorption rate and better in tensile strength and elongation at break. Meanwhile, excellent biodegradability is realized.

This invention relates to the field of polymer materials technology, specifically disclosing a flame-retardant thermoplastic elastomer compound and its preparation method. The flame-retardant thermoplastic elastomer compound comprises 50-80 parts SEBS, 10-30 parts PP, 5-15 parts compatibilizer, 10-30 parts composite flame retardant, 3-10 parts plasticizer, 0.2-1 parts antioxidant, and 0.1-0.5 parts lubricant. The composite flame retardant is prepared by reacting and mixing an intumescent flame retardant, barium metaphosphate, boron nitride, triallyl isocyanurate, and SEBS. The flame-retardant thermoplastic elastomer compound of this application possesses good flame retardancy, mechanical properties, and water resistance stability.

The invention relates to the technical field of high polymer materials, and discloses a preparation method of a low-water-absorption and high-strength PA6 composite material, which comprises the following steps: adding PA6, silicone powder, an adamantane modified hyperbranched polymer, epoxy adamantane, polyethylene resin, polypropylene and an antioxidant 1076 into a twin-screw extruder, melting, blending and extruding to obtain the low-water-absorption and high-strength PA6 composite material. And carrying out injection molding by using an injection molding machine to prepare the low-water-absorption high-strength PA6 composite material. In the melt blending process, a terminal hydroxyl group in the adamantane modified hyperbranched polymer and an epoxy group in epoxy adamantane are subjected to a ring-opening reaction, cross-linking is generated between the terminal hydroxyl group and the epoxy group, the terminal hydroxyl group and the epoxy group are wound with PA6, and the terminal hydroxyl group and the epoxy group are tightly connected with each other, so that the tensile strength and the bending strength of the material are remarkably improved. Adamantyl groups in the adamantane modified hyperbranched polymer and the epoxy adamantane have good hydrophobicity, and the adamantane modified hyperbranched polymer, the epoxy adamantane, the polyethylene resin and the polypropylene low-water-absorption resin jointly form a low-water-absorption system.

The invention provides a composite carbon black material for artificial stone as well as a preparation method and application thereof, the composite carbon black material for artificial stone comprises the following raw materials in parts by weight: 10 parts of carbon black and 3 parts of a siloxane complexing agent, the moisture content of the composite carbon black material is less than 1%, and the particle size is less than or equal to 10 microns. The composite carbon black material for the artificial stone can be applied to production of quartz plates, and the composite carbon black accounts for 2-6% of the mass of the quartz plates. According to the composite carbon black material for the artificial stone as well as the preparation method and the application of the composite carbon black material, the compatibility with a quartzite base material can be enhanced, and the water absorption rate of a plate is reduced, so that the anti-knock performance and the waterproof and impermeable performance are improved.

The invention discloses a lithium iron manganese phosphate composite material and a preparation method and application thereof, belonging to the technical field of lithium batteries. The composite material comprises the following raw materials: a lithium source, a manganese source, an iron source, phytic acid, graphene oxide, polyvinyl alcohol, pyrrole and a dopant. The invention adopts a hydrothermal method to make hydroxyl groups on the surface of graphene oxide react with phytic acid to obtain a mixed solution a, and similarly obtains a mixed solution b containing polyvinyl alcohol phytate, combines a manganese source, a lithium source and an iron source, prepares a semi-finished product by roasting, and then coats a doped polypyrrole layer on the surface of the semi-finished product to finally obtain a lithium iron manganese phosphate composite material with a three-dimensional structure. The three-dimensional structure is a composite structure of a rod-like structure and a sheet structure. Compared with the lithium iron manganese phosphate material with a single morphology in the prior art, the specific surface area is significantly improved, the stability is stronger, the contact area with the electrolyte is larger, and the diffusion efficiency of lithium ions and the charge and discharge performance of the battery are improved.