314results about How to "Good physical properties" patented technology

The invention belongs to the field of catalysts, and particularly relates to an alumina carrier as well as a preparation method and application thereof. The surface of the alumina carrier has oxygen-containing groups, and the density of the oxygen-containing groups on the surface of the alumina carrier is 0.15-5mmol / m < 2 >. Wherein the oxygen-containing group is at least one of hydroxyl, carboxyl and lactone group; the specific surface area of the alumina carrier is 10-150m < 2 > / g. The types, the number and the density of oxygen-containing groups on the surface of the obtained carrier are improved, and various index requirements of various supported catalysts on dispersion forms and dispersion degrees of different metal active components in the field of petrochemical engineering can be well met; and the carrier also has the characteristics of low bulk density, high water absorption rate, large pore volume and large average pore size, has a gain effect on uniform distribution of active metal components in the catalyst loading process, and has extremely high application value.

The invention relates to the technical field of waste rubber recovery, in particular to a method for preparing a rubber compound by recycling waste rubber and the prepared rubber compound. The high-shear mechanical desulfurization technology is combined, the desulfurization efficiency is further improved through the synergistic effect of various components in the compound auxiliary, and meanwhile the plasticity of the waste rubber and the compatibility of the waste rubber and new rubber are enhanced. The method not only can effectively destroy the cross-linked structure of the waste rubber, but also can be used for preparing a high-performance rubber compound product by mixing the waste rubber with a new rubber material through a subsequent mixing process, and is widely applied to manufacturing high-strength and wear-resistant rubber products, such as solid tires and the like.

The invention discloses a production method of distiller's grain fermentation liquid fertilizer specially applied to roxburgh rose. The distiller's grain fermentation liquid fertilizer is prepared bythe step of evenly mixing 50 to 80 parts of distiller's grain fermentation extracting solution, 0.5 to 1 part of microelement, 5 to 10 parts of seaweed meal, 5 to 10 parts of natural active organism,2 to 5 parts of potassium bicarbonate, 2 to 5 parts of natural active organism and 2 to 5 parts of natural surface active agent. A preparation method of the distiller's grain fermentation extracting solution comprises the steps: evenly stirring 50 to 80 parts of distiller's grain, 50 to 150 parts of rice washing water, 1 to 2 parts of EM microflora fermentation liquid and 0.5 to 1 part of sugar, performing composting fermentation at the room temperature to obtain a distiller's grain fermentation material, stirring and extracting through a sodium carbonate water solution, filtering and performing evaporation and condensation on obtained filtrate until the density is 1.1 to 1.2 to obtain distiller's grain fermentation extracting solution. The distiller's grain fermentation liquid fertilizerdisclosed by the invention has a good use effect, meanwhile can effectively prevent pest and disease damage to the roxburgh rose and is high-efficiency environment-friendly liquid fertilizer.

The invention discloses a soil ecological restoration method suitable for plant transplantation and a plant transplantation method, and relates to the technical field of soil ecological restoration, and the method comprises the following specific implementation steps: S1, soil evaluation; s2, pollutant treatment; s3, soil improvement; s4, covering and protecting soil; in the step S1, the structure, texture, pH value, nutrient content, pollutant level and the like of the soil are comprehensively analyzed; the method comprises the following steps: testing the pH value and saline-alkali content of polluted soil needing planting, digging away soil with high saline-alkali content, and backfilling soil with low saline-alkali content; or an isolation system is arranged, materials such as lime and slag are used for isolating saline-alkali soil from alien soil, films and the like are transversely used for isolating surrounding saline-alkali soil, and the cost is low. According to the soil ecological restoration method suitable for transplanting the plants and the plant transplanting method, the water content and permeability of the soil are improved through layer-by-layer improvement of the soil, the physical properties of the soil are improved, and growth of the plants is facilitated.

The invention provides a macromolecular agglomerant and a preparation method thereof. The high-molecular agglomerant takes 1, 3-butadiene as a main polymeric monomer and alpha, beta-unsaturated acid as a comonomer, and assistants comprise an emulsifier, an initiator and deionized water. The macromolecular agglomerant is used for further preparing large-particle-size polybutadiene latex and polyacrylate latex, the components are simple, introduction of more new monomers is reduced, the stability of the latex in the agglomeration process is improved, then ABS and ASA resin is prepared, the impact resistance and tensile property of the ABS and ASA resin are improved, and particularly the impact resistance under the low-temperature working condition is improved.

The invention discloses a microbial compound high-efficiency organic bacterial fertilizer which comprises the following raw materials: 10-20 parts of a microbial agent, 10-20 parts of humic acid, 3-10 parts of natural mineral powder, 1-7 parts of a plant extract, 2-4 parts of amino acid, 2-5 parts of a seaweed extract, 1-3 parts of chitosan, 3-7 parts of charcoal, 1-3 parts of chitin, 2-5 parts of potassium fulvate and 1-3 parts of lignosulfonate. The problems that existing organic bacterial manure is single in function, not remarkable in effect, high in preparation cost and the like are solved. The organic bacterial fertilizer has multiple functions of improving soil fertility, promoting crop growth, enhancing crop stress resistance and the like, and the preparation method is simple, easy to implement, low in cost and suitable for large-scale production.

The invention belongs to the field of steelmaking refining, relates to a preparation and use method of a complex deoxidizer for LF slagging, and aims to solve the problems that the existing complex deoxidizer containing elements such as calcium, magnesium, barium, strontium, sodium and potassium is difficult to detect and analyze, the quality is difficult to guarantee, low-melting-point inclusions are formed in steel, the cleanliness of molten steel is influenced, and the molten steel cannot be cleaned easily. According to the invention, the steel ladle top slag after converter or electric furnace tapping is subjected to deoxidation modification, and the desulfurization, deoxidation and inclusion removal functions are improved. The steel slag deoxidizing agent is scientific and reasonable in chemical component design, good in physical performance, wide in material source, simple to prepare, rapid in steel slag deoxidizing, obviously improved in molten steel cleanliness and low in application cost.

The invention relates to the technical field of capacitor preparation, in particular to a preparation process optimization method and system applied to a high-frequency special capacitor, and the method comprises the steps: confirming a preparation environment, receiving a preparation instruction based on the preparation environment, and if the quality of a modified polypropylene film is not within a preset quality interval, determining that the modified polypropylene film is not in the preset quality interval; if yes, returning to the step of obtaining the modified polypropylene film according to the preparation instruction, and if the mass of the modified polypropylene film is within a preset mass interval, metallizing the modified polypropylene film by utilizing distillation equipment to obtain a metallized modified film; and completing the preparation process optimization method applied to the high-frequency special capacitor based on the sealed capacitor, the maximum power density report and the conductivity report. According to the invention, key parameters in the preparation process can be acquired and dynamically adjusted in real time, so that the accuracy of capacitor performance evaluation is improved.

The invention discloses an amorolfine hydrochloride liniment and a production process. The formula of the amorolfine hydrochloride liniment comprises amorolfine hydrochloride, ethanol, propylene glycol, polyethylene glycol, acrylic resin RL100, glyceryl triacetate, ethyl acetate and butyl acetate. The preparation method comprises the following steps: 1, selecting a solvent material; step 2, generation of an amorolfine raw material; step 3, synthesizing amorolfine hydrochloride; step 4, preparation of the liniment; step 5, quality control; and step 6, packaging and storing. The amorolfine hydrochloride liniment based on the acrylic resin RL100 as the coating and framework material is designed, the specific release requirement of the medicine can be effectively met, ultraviolet rays can be absorbed, erosion of the ultraviolet rays can be effectively resisted, and the service life of the medicine is prolonged; meanwhile, the propylene glycol component is added, so that the stability and solubility of the medicine and the permeability of the medicine are improved; the polyethylene glycol component is also added, so that the smearing property and the use experience of the medicine can be improved.

The invention provides a preparation method of a conductive toughened self-lubricating polyimide composite material, and relates to the field of hybrid multi-scale nano composite materials. The material is prepared from the following raw materials: polyimide, a surfactant, a lubricant, a conductive agent and a dispersing agent. The preparation method of the material comprises the following steps: stably dispersing graphite and carbon nanotubes in a liquid medium by utilizing the amphipathy of graphene oxide, uniformly mixing the graphite and the carbon nanotubes with polyimide slurry, freezing, soaking, self-assembling to form a three-dimensional continuous carbon nano network, and finally carrying out compression molding on a hot press. The conductive toughened polyimide composite material is prepared by the method which is simple, convenient, efficient, wide in applicability and convenient for industrial production, the impact resistance and the high-temperature self-lubricating performance of the conductive toughened polyimide composite material can be remarkably improved while static electricity is dissipated, and the application range of the polyimide composite material in the fields of aerospace, new energy automobiles, electronics, microelectronics and the like is widened.

The invention discloses a porous carbon material and a preparation method and application thereof, the method comprises an activation step of activating a carbonized material, and the activation step comprises placing the carbonized material in a product channel of a split-phase rotary furnace, a basic activation area, a chambering activation area and a supplementary activation area which are sequentially arranged along the advancing direction of the carbonized material are formed in the split-phase product channel; the activation step comprises the step of activating for 80-200 minutes at the temperature of 800-850 DEG C in a basic activation area; activating for 80-120 minutes at the temperature of 850-900 DEG C in a reaming activation area, and then activating for 80-120 minutes at the temperature of 900-850 DEG C; and activating for 60-120 minutes at the temperature of 850-750 DEG C in a supplementary activation area. The porous carbon material obtained by adopting the preparation method has micropores with larger specific surface area and smaller pore diameter, the application range of the porous carbon material is expanded, and the performance of downstream products is favorably improved.

The invention relates to the field of packaging materials, in particular to a high-barrier waterproof and oil-proof PHA composite film, a preparation method of the PHA composite film and a prepared protective inflatable bubble bag and paper cup. Comprising the following steps: dispersing PHA particles in a dispersion liquid to obtain a PHA dispersion with the solid content of 1-3%, and then carrying out vacuum distillation to obtain a PHA dispersion with the solid content of 60-70%; the method comprises the following steps: coating a PHA dispersion with the solid content of 60-70% on a base material, and drying at 145-155 DEG C to form a coating on the base material; and carrying out hot pressing on the surface containing the coating at 175-185 DEG C to obtain the PHA composite film. Through the production process, the obtained PHA dispersion with the solid content of 60-70% is subjected to coating, curing and hot pressing to form a stable PHA layer, so that the obtained PHA composite film has better barrier property and physical property.

The invention discloses a low-twist manufacturing process of a PPS woven fabric. The low-twist manufacturing process comprises the following steps: step S1, pretreating PPS fibers; s2, fiber drawing and roving preparation; s3, spun yarn preparation and low twist treatment; step S4, weaving and post-processing; according to the low-twist manufacturing process for the PPS woven fabric, the quality of the PPS woven fabric can be remarkably improved, low twist, high strength and excellent hand feeling are achieved, the softness and air permeability of the fabric are improved, meanwhile, the production efficiency is improved, and the production cost is reduced; naOH aqueous solution soaking and washing in the pretreatment step can effectively remove impurities and grease on the surface of the PPS fiber, so that the wettability and spinnability of the fiber are improved; through post-treatment steps such as desizing, boiling-off and bleaching, slurry, impurities and grease on the surface of the woven fabric can be effectively removed, the wettability and dyeability of fibers are improved, and the post-treated PPS woven fabric has excellent physical properties such as high strength, high temperature resistance and chemical corrosion resistance.

The invention provides antibacterial and mildew-proof corrugated paper and a preparation method thereof, and belongs to the technical field of packaging materials. According to the corrugated paper, the efficient antibacterial agent is doped into the paper base material, and the paper base material is packaged through a microcapsule technology, so that uniform distribution and long-acting release of the antibacterial agent in the paper are ensured. The preparation process comprises the steps of paper pulp preparation, antibacterial agent preparation, raw paper preparation, antibacterial protection layer coating, corrugated paper forming and the like. The antibacterial and mildewproof corrugated paper has excellent antibacterial and mildewproof effects, can keep good physical properties, is suitable for packaging products such as food, medicines and cosmetics with strict requirements on sanitary conditions, effectively prevents microbial contamination and guarantees product quality and safety.

The invention belongs to the technical field of biological bacteriostasis and food packaging materials, and particularly relates to a carboxymethyl chitosan-covalent organic framework-nano-silver composite material and a preparation method and application thereof. According to the preparation method of the carboxymethyl chitosan-covalent organic framework-nano-silver composite material, provided by the invention, a metagen is adopted as a reducing agent, and AgNPs is synthesized through a biological method; the COF-AgNPs composite material is prepared by an in-situ growth method, and the ordered porous structure of the COF provides specific constraint for the AgNPs, so that aggregation of the AgNPs is effectively avoided; in addition, COF-AgNPs is added into a CMCS matrix, so that the film-forming ability of the COF-AgNPs is enhanced, and the CMCS matrix is endowed with excellent antibacterial performance and mechanical performance. Therefore, the composite film material prepared by adopting the preparation process can effectively improve the fresh-keeping effect of fruits and vegetables, and has a good application prospect in the field of packaging film materials for fruit and vegetable fresh-keeping.

The invention discloses a biphenyl derivative photoinitiator, a preparation method of the biphenyl derivative photoinitiator, a photocuring thin film material and a preparation method and application of the photocuring thin film material. The biphenyl derivative has a structural formula shown as a formula (I), R1 is an electron donor group, and R2 is an electron acceptor group. According to the invention, biphenyl is taken as a main body structure, different donor groups R1 and acceptor groups R2 are connected, the photoinitiator is synthesized through Suzuki reaction, and a polymeric monomer material is N, N-dimethylacrylamide (DMA). The photocuring material with long afterglow luminescence can be obtained through an ultraviolet irradiation method, and under the irradiation of a 365nm ultraviolet lamp, an initiator absorbs photons to generate active species to attack double bonds in a monomer to initiate a polymerization reaction. The light-cured film can generate long afterglow luminescence as long as several seconds after being illuminated, and can be applied to the aspects of counterfeiting prevention, 3D printing, photoetching and the like.

The invention relates to the technical field of soil improvement, and discloses a soil improvement fertilizer and application thereof in saline-alkali soil improvement, a preparation method of the soil improvement fertilizer comprises the following steps: mixing cow dung, chicken manure and straw, and carrying out anaerobic fermentation to obtain an organic fertilizer; mixing soybean, corn and seaweed, performing enzyme catalysis treatment, and extracting to obtain an amino acid liquid fertilizer; soaking brown algae in hot water, filtering and concentrating to obtain a seaweed extract; uniformly mixing silicate minerals, natural gypsum powder, the organic fertilizer, the amino acid liquid fertilizer and the seaweed extract, and sequentially drying and crushing to obtain the soil improvement fertilizer. According to the soil improvement fertilizer disclosed by the invention, various components such as the organic fertilizer, the amino acid liquid fertilizer, the seaweed extract, the silicate minerals and the gypsum powder are meticulously proportioned, so that the soil fertility can be remarkably improved, the soil structure is optimized, the growth of plant root systems is promoted, the stress resistance of plants is enhanced, and the sustainable utilization of soil is improved for a long time.

The invention relates to the technical field of soil improvement, and discloses a multiple-effect soil conditioner based on waste and inferior tobacco leaves and a preparation method and application of the multiple-effect soil conditioner based on the waste and inferior tobacco leaves. 24-28% of mushroom residue; 24-28% of tea seed shells; 10-15% of pig manure; the preparation method comprises the following steps: collecting raw materials including waste tobacco leaves, mushroom residues, tea seed shells and pig manure, detecting and proportioning the raw materials, adding the bacillus subtilis into the raw materials, uniformly mixing, fermenting for thirty days, turning once every ten days during fermentation, and detecting again to obtain the multi-effect soil conditioner. The soil conditioner is applied to the ploughed farmland according to 100 kg / mu to 150 kg / mu and covered with soil, then the farmland covered with the soil is ploughed by 8 cm to 12 cm, flue-cured tobaccos are planted, and the conditioner can achieve the effects of improving the physical and chemical properties of soil, promoting the growth and development of the tobaccos, improving the yield and quality of the tobacco leaves and enhancing the stress resistance of the tobaccos.

The invention discloses a method for granulating a phosphate tailing, phosphate tailing particles prepared therefrom, and applications thereof, and belongs to the technical field of waste resource recovery and safe utilization. The method for granulating a phosphate tailing of the invention comprises the following steps: uniformly mixing tannic acid, lignin sulfonate, and tea saponin to obtain a composite binder; uniformly mixing the composite binder with the phosphate tailing powder to perform granulation, wherein the tannic acid and lignin sulfonate undergo a complex reaction, and the tea saponin increases fluidity and surface activity, so that the composite binder penetrates into the interior of the phosphate tailing powder to exert a bonding effect, thereby preparing phosphate tailing particles. The phosphate tailing particles prepared by the invention have excellent granulation rate, particle strength, and solubility.

The invention belongs to the technical field of pre-hardened die steel, and particularly relates to pre-hardened die steel with a high heat conductivity coefficient and a preparation technology of the pre-hardened die steel. By optimizing the alloy component design and adopting the high-purity triple smelting process, the heat conduction performance is remarkably improved, the heat conductivity coefficient reaches 54 W / m * K, the mold steel with higher heat conductivity compared with traditional mold steel pre-hardened to 38-42 HRC is obtained, and meanwhile the excellent hardness and wear resistance are kept. The die steel not only has higher heat transfer speed and obviously shortens the injection molding cooling time, but also shows extremely high stability and durability in the use process, prolongs the service life of the die and reduces the production cost of enterprises. In addition, due to the excellent physical property, the mold can be suitable for a more complex and finer injection molding process.

The utility model discloses a stain-resistant color-changing car cover which comprises a PET protective layer, a stain-resistant self-repairing varnish layer, a TPU base film layer, a color-changing layer, a pressure-sensitive adhesive layer and a release protective film layer, and the PET protective layer, the stain-resistant self-repairing varnish layer, the TPU base film layer, the color-changing layer, the pressure-sensitive adhesive layer and the release protective film layer are sequentially stacked. The PET protective layer, the stain-resistant self-repairing varnish layer, the TPU base film layer, the color-changing layer, the pressure-sensitive adhesive layer and the release protective film layer are sequentially stacked, so that the stain-resistant color-changing car cover has the effects of stain resistance, doodling resistance, self-repairing, color changing, heat insulation, explosion prevention and the like, and the individuation and stain resistance of the stain-resistant color-changing car cover are improved; in addition, the PET protective layer and the pressure-sensitive adhesive are torn off after being attached, no adhesive residue exists, maintenance and cleaning are convenient, and therefore the maintenance cost of the stain-resistant color-changing car cover is reduced.

The utility model discloses a prefabricated diaphragm wall type assembled subway entrance and exit structure which comprises side wall structures, a prefabricated top plate and a prefabricated bottom plate are arranged between the side wall structures of the entrance and exit, the prefabricated top plate and the prefabricated bottom plate are both connected with the side wall structures through ultrahigh concrete, and the side wall structures are formed by integrating an enclosure structure and a main body structure. The side wall structure comprises prefabricated underground diaphragm walls, and underground diaphragm wall inter-amplitude connecting assemblies are arranged between the adjacent prefabricated underground diaphragm walls. The foundation pit support structure, the waterproof curtain and the side wall of the main body structure are integrated, so that working hours and manufacturing cost are saved. According to the utility model, the connection scheme of the waterstop strip bags, the C / T inter-width connectors and the UHPC concrete wet joints is adopted between the prefabricated underground diaphragm walls, so that the waterproof and guiding effects are achieved. According to the utility model, the longitudinal tensioning connection scheme of the inter-width concave-convex tenons, the elastic sealing gaskets and the prestressed steel bars is adopted between the prefabricated plate widths, so that not only can shearing force be effectively transmitted, but also a water stopping effect can be achieved.

The external circulation water pump of the small-displacement diesel engine comprises a water pump shell and a transmission shell installed on one side of the water pump shell, a water inlet and a water outlet are formed in the water pump shell, and the side, away from the transmission shell, of the water pump shell is detachably connected with an end cover used for sealing the water pump shell. A flexible impeller is installed in the water pump shell, a transmission shaft is installed in the transmission shell, and a water seal is arranged between the water pump shell and the transmission shell. The sealing performance between the transmission shell and the water pump shell can be improved through the water seal, in addition, even if the water seal loses efficacy, the transmission shell exists between the water pump shell and the diesel engine, seawater entering the transmission shell can be rapidly discharged through the through hole, and therefore the seawater cannot enter an engine gearbox, the influence on a diesel engine lubricating system is avoided, and the service life of the diesel engine is prolonged. Normal operation of the diesel engine is ensured.

The invention belongs to the technical field of bioplastics, and particularly relates to a bioplastic as well as a preparation method and application thereof. The bioplastic is prepared from the following raw materials in parts by mass: 10-70 parts of cellulose, 1-10 parts of a flexibilizer, 1-40 parts of a first plasticizer, 1-2 parts of a second plasticizer, 0.3-15 parts of a lubricant, 1-10 parts of an inorganic filler, 0.1-2 parts of starch and 0.1-5 parts of an auxiliary agent. Natural substances of cellulose are fully utilized, the strength and impact resistance of starch are improved, the starch has the physical property suitable for being used as a plastic substitute raw material, and plastic degradation can be accelerated by simultaneous generation of biodegradation and photodegradation while the manufacturing cost is reduced, so that the problem of plastic waste is solved.

The invention discloses a degradable adhesive tape and a preparation method thereof, wherein the adhesive tape comprises a degradable adhesive tape substrate layer and a degradable adhesive tape adhesive layer; wherein the degradable adhesive tape substrate layer comprises the following raw materials in parts by weight: 30-80 parts of polylactic acid (PLA), 20-30 parts of starch, 5-10 parts of distilled water, 0.5-10 parts of plasticizer, 1-2 parts of degradation agent, 0.1-1 parts of antioxidant, 0.1-1 parts of lubricant, and 0.2-0.4 parts of ultraviolet absorber; the degradable adhesive tape adhesive layer comprises the following raw materials in parts by weight: 40-50 parts of starch, 10-50 parts of polyvinyl alcohol, 35-40 parts of oxidant, 150-200 parts of water, 5-6 parts of sodium hydroxide, 2-4 parts of defoamer, 1-4 parts of cross-linking agent, 5-10 parts of acid, and 0.2-0.4 parts of aluminum sulfate. The degradable adhesive tape of the invention is pollution-free, simple in process and low in cost; the adhesive tape has good degradability and physical properties.

The invention discloses a high-barrier anti-leakage packaging bag for storing medical instruments and a preparation method, and belongs to the technical field of packaging bag preparation. The high-barrier and anti-leakage packaging bag for storing the medical instruments is composed of an isolation layer, an adhesion layer and an inner wall layer, the isolation layer, the adhesion layer and the inner wall layer are sequentially arranged from outside to inside, the isolation layer is composed of composite polyester, the adhesion layer is composed of ethylene acrylic resin, and the inner wall layer is composed of polypropylene and an antibacterial agent. The packaging bag prepared by the method has excellent high-barrier anti-permeation performance, and also has excellent flame-retardant and antibacterial performance.

The invention discloses solvent-free polyurethane resin for automobile leather and a preparation method and application thereof, and relates to resin for coating parts and seats in the fields of automobiles and the like, the resin comprises a component A and a component B. The component A is prepared from long-chain alkyl modified organic silicon polyether glycol, polyether glycol, polyether triol, a chain extender, a catalyst and a flame retardant, and the component B is prepared from a component C and a component B. The component C is prepared from long-chain alkyl modified organic silicon polyether glycol, polyether glycol, polyether triol, a chain extender, a catalyst and a flame retardant. The component B is prepared from organic silicon modified polyether glycol, polyether triol and diisocyanate; the component A and the component B are mixed according to the weight ratio of (100: 60)-(100: 80) to obtain the resin. The resin overcomes the defects in the aspects of coating performance, thermal tensile property, curing performance and the like of automobile leather, and has good peel strength, cold resistance, hydrolysis resistance and high temperature resistance.

The invention relates to a biodegradable mulching film special material, a mulching film and a preparation method of the mulching film. Biodegradable materials such as PBAT, PLA and PBS are adopted, PBAT is used as a main material, and the cost is reduced through reasonable proportioning. Low-cost raw materials such as black master batches and talcum powder and additives such as a lubricant and an anti-hydrolysis agent are added, so that the cost is further reduced while the performance of the mulching film is ensured. The degradation speed of the mulching film can be controlled by adjusting the material ratio and is matched with the growth cycle of crops. The black mulching film has good heating and heat preservation effects and inhibits growth of weeds. The talcum powder, the antioxidant, the anti-ultraviolet agent and the like are added, so that the physical properties of the mulching film are improved, the water-retaining property, the tensile strength and the like are improved, PBAT is enhanced, and the production cost is reduced. The compatilizer improves the compatibility of the raw materials and improves the performance of the mulching film. And the nucleating agent improves the crystallization property of the mulching film, and improves the transparency, glossiness and impact resistance. On the whole, the performance of the mulching film is guaranteed, meanwhile, the cost is reduced, and the durability and the tear resistance are improved.

The invention belongs to the technical field of metal materials, and particularly relates to an aluminum alloy composite board and a preparation method thereof, and the preparation method of the aluminum alloy composite board comprises the following steps: (1) preparing an Al-Si-Mg alloy melt, preparing an Al-Zr alloy melt, and then respectively casting to obtain an Al-Si-Mg cast ingot and an Al-Zr cast ingot; (2) treating the Al-Si-Mg cast ingot and the Al-Zr cast ingot to obtain an Al-Si-Mg alloy sample and an Al-Zr alloy sample, cutting the Al-Si-Mg alloy sample and the Al-Zr alloy sample, and then respectively carrying out subzero treatment and cold rolling to obtain an Al-Si-Mg rolling sample plate and an Al-Zr rolling sample plate; and (3) the Al-Si-Mg rolling sample plate and the Al-Zr rolling sample plate are pretreated, powder stacking is conducted between layers of the pretreated Al-Si-Mg rolling sample plate and the pretreated Al-Zr rolling sample plate, then attaching, preheating and accumulative ply rolling welding are conducted, and the aluminum alloy composite board is obtained. The prepared aluminum alloy composite board is more excellent in performance, simple and convenient in preparation steps and suitable for industrial production.

Provided is a sizing agent for fibers, which is capable of suppressing hardening of fiber bundles over time. A sizing agent for fibers, which contains an epoxy resin (A) and a surfactant (B), and wherein the complex viscosity of the non-volatile matter of the sizing agent at 25 DEG C, a strain of 0.005, and a frequency of 1 Hz is 1 * 102 to 1 * 104 Pa.s, and the loss modulus of the non-volatile matter of the sizing agent at 120 DEG C, a strain of 1, and a frequency of 1 Hz is 1 to 15 Pa. In the sizing agent for fibers in the technical scheme 1 requested to be protected preferably, the epoxy resin (A) contains a compound (a1) shown in the following general formula (1).