32results about How to "Meet the rigidity" patented technology

The invention discloses a method for preparing high-rigidity chlorinated polyethylene by using a hydrochloric acid phase process, which comprises the following steps: adding high-density polyethylene, dispersing agent and anti-adhesion agent in hydrochloric acid solution in a stirring state to prepare suspension; feeding in chlorine into the suspension in two stages for implementing chlorination reaction, with the reaction temperature being from 30 to 140 DEG C, the reaction time being from 3-5 hours and the feed-in amount of the chlorine being 0.5-1.2 times as large as the weight of the high-density polyethylene; afterwards, separating, washing, dehydrating and drying the chlorinated products to result in the high-rigidity chlorinated polyethylene product with 20-35wt% of the chlorine content, DSC which is not more than 5J/g, 60-80 of Shore hardness and more than 2.0MPa of 100% modulus at definite elongation. The high-rigidity chlorinated polyethylene prepared according to the method can take the place of high-price MBS to serve as an anti-impact modifier of hard PVC articles and meet the demands of materials about rigidness and toughness.

The invention provides double-sided composite card paper and a preparation method thereof. A lining pulp layer is covered on one side of a core pulp layer, a bottom pulp layer is covered on the other side of the core pulp layer and a surface pulp layer is covered on the lining pulp layer; or lining pulp layers are covered on two sides of a core pulp layer, a surface pulp layer is covered on the lining pulp layer on one side, and a bottom pulp layer is covered on the lining pulp layer on the other side. Common waste paper pulp (office waste paper, common waste paper boards and the like) is used for replacing wood pulp to serve as core pulp, and waste paper de-inking pulp and waste white paper edge pulp are used for replacing wood pulp to serve as lining pulp so as to save the cost; each layer is specifically quantified; and the obtained double-sided composite card paper has heavy handfeel and crisp paper surface, press molding and embossing processes required for processing and molding have better implementing effects, the expressed levels are richer, the dependency of the product on operating workers is furthest reduced, and effective expansion of the capacity and increment of the economic benefit are furthest realized.

The invention discloses a high-rigidity high-heat-resistance homo-polypropylene material which is prepared from the following raw materials: a homo-polypropylene resin, an antioxidant, a halogen absorbent and a nucleating agent. The homo-polypropylene resin is prepared by the following steps: adding the raw material propylene into a loop reactor, adding the catalyst, cocatalyst, electron donor and antistatic agent, and uniformly stirring, wherein the reaction temperature in the loop reactor is controlled at 70+/-1 DEG C, the reaction pressure is controlled at 3.4-3.8 MPa, and the hydrogen concentration is controlled at 3500-4500 ppm. The invention also discloses a preparation method of the high-rigidity high-heat-resistance homo-polypropylene material. The high-rigidity high-heat-resistance homo-polypropylene material has higher melt index, bending modulus and heat-deformation temperature, and can satisfy the raw material requirements of injection molding manufacturers of small home appliances, automobiles and the like.

The invention belongs to the technical field of preparation of PVC (polyvinyl chloride) impact modifiers, and particularly relates to a high-tensile-strength impact modifier for PVC and a preparation technique thereof. The preparation technique comprises the following steps: grafting epoxypropyl methacrylate onto a polyethylene main chain in the presence of a grafting assistant, and carrying out chlorination modification by an acid-phase process to obtain the high-tensile-strength impact modifier for PVC. The impact modifier for PVC can be widely used in the fields of PVC profiles, tubes and plates, can be used instead of high-price acrylate impact modifiers in the aspects of shock resistance and tensile property, and greatly enhances the weather resistance and working properties of the PVC product. The invention satisfies the performance requirements for rigidity, weather resistance, dimensional stability and the like, and the production process is green and environment-friendly and is easy to control.

The invention relates to a centrifugal casting process for the shell of a bimetal compound metallurgical wedge hob, which sequentially comprises the steps of moulding, shell modification, spraying, mold shell assembling, molten steel smelting, deoxidization and slag removing, pouring, heat preservation and coring, blasting and sand removal, processing and finishing, heat treatment and the like. The wedge hob produced through the process above not only has the advantages of high hardness, good abrasion-resistance and the like, but also has good comprehensive mechanical properties such as stiffness, toughness and the like, thereby satisfying the requirements for strength and wear resistance of cutter teeth of the wedge hob, ensuring the manufacturability of the hob body, improving the service time of the cutter teeth of the wedge hob, and reducing the production cost.

The invention provides a method for preparing an acrylonitrile-butadiene-styrene copolymer toughened rigid polyvinyl chloride composite material and belongs to the technical field of high molecular material preparation. The method comprises the steps of: firstly, feeding 61-67 parts of polyvinyl chloride resin, 4-7 parts of plasticizer, 8-13 parts of flexibilizer, 12-18 parts of filler, 0.9-1.5 parts of stabilizer, 4-7 parts of cellulose, 0.4-1 part of lubricant and 0.7-1.5 parts of carbon black into a high-speed mixer to obtain a mixture; and then feeding the mixture into a parallel twin-screw extruder for melt extrusion, and finally, subjecting the extruded material to water cooling, sized dicing and drying, thereby obtaining the finished product, wherein the temperatures of the screws of the parallel twin-screw extruder are controlled to 130 DEG C, 135 DEG C, 140 DEG C, 145 DEG C, 155 DEG C, 165 DEG C, 165 DEG C, 165 DEG C, 170 DEG C and 165 DEG C from the first zone to the tenth zone. The method provided by the invention is simple and short in process steps and rational in raw material selection.

Provided is A metal energy absorbing bracket for a dashboard of an automobile. the metal energy absorbing bracket is installed between a rear end of the dashboard and a body sheet metal, the metal energy absorbing bracket comprises a lateral panel and side panels arranged on both sides of the lateral panel, the side panels comprises lower side panels and upper side panels connected together by bending portions, the lower side panels is connected on both sides of the lateral panel; The side plates are symmetrically arranged, and the lower side plates on both sides are provided with an opening angle of 25 DEG to 35 DEG, the upper side plates on both sides are arranged in parallel, and the lower side plates on the same side and the upper side plates are provided with an included angle of 100DEG to 110 DEG. The metal energy-absorbing bracket of the invention changes the straight strip direct structure in the prior art, adopts the bending structure and the open angle structure, and has good collision energy-absorbing effect. The angle between the lower side plate and the upper side plate is 100-110 degrees, and the angle between the lower side plate and the upper side plate is 25 -35degrees, which can well cushion the impact force in the vertical direction.

The invention discloses a light high-wave-transmissivity composite material and a preparation method thereof, and belongs to the technical field of materials. The light high-wave-transmissivity composite material is prepared from the following components in parts by weight: 55-75 parts of a polyether ketone material, 5-20 parts of polyether sulfone, 10-40 parts of a reinforcement, 1-5 parts of a foaming agent and 0.2-1 part of a dispersing agent. According to the light high-wave-transmissivity composite material and the preparation method thereof, the thermoplastic polyether ketone material with high heat resistance and high strength is adopted as a base body, inorganic fiber with high strength and modulus and high wave transmissivity is attached to the base body to serve as the reinforcement, so that the high-wave-transmissivity thermoplastic composite material is prepared, moreover, a micro-foaming technology is adopted, so that the high-wave-transmissivity material which is lighteris obtained on the premise that the performance requirements of high wave transmissivity, low loss, high temperature resistance, high rigidity, high strength, stable size and the like of a radome material are met, the specific gravity of the material is decreased by 25% or more, and the weight reduction requirement for a product is met; in addition, the material can be directly subjected to extrusion and injection molding, and the product efficiency is high.

The invention provides an automobile seat sliding rail device, which comprises a sliding rail which is provided with a rack; a seat supporting seat which is arranged on the sliding rail in a sliding mode, and a containing cavity is formed in the seat supporting seat; an automobile seat which is fixedly mounted on the seat supporting seat; a driving motor which is arranged in the accommodating cavity and is fixedly connected with the seat supporting seat; an output shaft of the driving motor is a threaded screw rod; a transmission mechanism which is arranged in the accommodating cavity and is fixedly connected with the seat supporting seat; the transmission mechanism comprises a helical gear and a straight gear which are coaxial and integrated, the helical gear is meshed with the threaded lead screw, and the straight gear is meshed with the rack on the sliding rail. By arranging the self-locking transmission mechanism, the structure is simplified, the preparation weight is reduced, theproblem of response delay of unlocking/locking is avoided, and follow-up stopping is achieved; by arranging the zipper type surface sealing structure, potential safety hazards caused by foreign matterfalling into the sliding rail are avoided, and the situation that dust and foreign matter fall off and are difficult to clean is avoided; meanwhile, the appearance is free of seams and hidden objects, so that the quality is improved.

The invention relates to a precision boring cutter for machining the inner contour of a deep hole of a bottle cavity. The precision boring cutter comprises a boring rod, a reducing structure and a pull rod. The pull rod penetrates through the boring rod and is connected with a transmission positioning block, the pull rod is connected with the transmission positioning block through a lead screw nut pair transmission system controlled by an external servo, the pull rod is driven to do axial linear telescopic motion, the pull rod transmits the axial motion to the mandrel through the pin, and the mandrel converts the axial telescopic motion into radial telescopic motion of the sliding block through the inclined face. Therefore, radial extension and retraction of the tool apron and the blade in the variable-diameter structure are realized. Meanwhile, the radial driving ratio of the reducing structure of the device is 2: 1, driving is accurate and reliable, the guiding blocks and the vibration reduction strips are arranged outside, the self-guiding and vibration suppression effects can be achieved, and the first sliding block guide rail, the second sliding block guide rail and the sliding block guide rail support are arranged inside, so that the requirement for the rigidity of bevel transmission of the reducing structure can be met. The device has the characteristics of reasonable structure, accuracy, reliability and the like, and can be widely used for processing various bottle cavity holes with complex internal profiles.

The present invention provides a shutter using a recording medium case of an aluminum alloy plate satisfying all the characteristics required for the shutter. The switch is composed of: an aluminum alloy substrate containing Mg: 2.2 to 2.8% by mass, Mn: 0.35 to 0.55% by mass, and Fe: 0.1 to 0.4% by mass; A chromate film provided as a first layer on the surface of the outer side of the shutter of the above-mentioned recording medium case, the above-mentioned chromate film is provided so that the amount of chromium deposited is 5 to 50 mg/m2 in conversion; A film made of acrylate-modified polyester urethane resin is provided as the second layer on the outer surface of the device, and the film thickness of the film made of acrylate-modified polyester urethane resin is 0.5 to 3 μm. Inorganic microparticles having an average particle diameter of 10 μm or less are contained in an amount of 5 to 20 parts by weight relative to 100 parts by weight of the above-mentioned acrylate-modified polyester-urethane resin, so as to be 100 parts by weight of the above-mentioned acrylate-modified polyester-urethane resin. The oxidized polyethylene-based lubricant is contained in a proportion of 0.5 to 3 parts by weight.

The invention discloses an integrated forming process of a high-power wind power motor cabin cover, and belongs to the field of wind power motor cabin cover forming processes. According to the integrated forming process of the high-power wind power motor cabin cover, the high-power wind power motor cabin cover is integrally formed by utilizing a vacuum introduction process, so that the performanceof the motor cabin cover is greatly improved; the bending strength of the resin of the adopted gel coat can reach 310MPa after being cured, the tensile strength is not lower than 180MPa, the elongation is not larger than 4%, and the thermal deformation temperature reaches up to 80 DEG C; the flame-retardant resin coating on the surface of the cabin cover has good water resistance, alkali resistance, scrubbing resistance, pollution resistance, temperature change resistance, flame retardance and the like, the oxygen index is not lower than 28, the performance requirements of the cabin cover onrigidity strength, corrosion resistance and ultraviolet resistance can be well met, in the vacuum introduction integrated forming process, hidden bubbles in the formed main material resin are removedby utilizing a bubble removing device, and the strength of the motor cabin cover is greatly improved.

The invention discloses an experimental device for an acoustic metamaterial plate structure, and belongs to the technical field of structural elements. The problem that the accuracy of the experimental data is influenced due to the lack of dedicated experimental device in the process of performing dynamics experiment research on the acoustic metamaterial plate structure in the prior art is mainlysolved. Two clamp brackets are oppositely arranged at two sides of the metamaterial plate, each fixed pressing plate is arranged at a top of one clamp bracket, one substrate in the metamaterial plateis arranged between the clamp bracket and the fixed pressing plate, and the metamaterial plate is fixedly arranged on the clamp brackets; each positioning rod is arranged at one side of each of two clamp brackets, and each positioning rod is fixedly connected with two clamp brackets; and each clamp bracket is fixedly connected with a vibration-isolation foundation track through N connectors. The device is mainly used as an experimental device for testing the dynamic performance of the acoustic metamaterial plate structure.

The invention discloses a method for converting disordered carbon into a high-energy crystal carbon material by using an inorganic compound, and relates to the technical field of extraction of biological hair macroelements. The method comprises the following nine process steps: 1, cleaning, disinfecting and crushing a hair sample; 2, performing ultraviolet treatment; 3, performing heat treatment; 4, performing fine grinding and secondary ultraviolet treatment; 5, performing vacuum roasting in a furnace; 6, soaking in alcohol, and drying for the second time; 7, mixing with an inorganic compound NaOH + H2O, and calcining; 8, performing acid leaching and drying in a normal-temperature environment; and 9, detecting the content of the high-energy crystal carbon material. The inorganic compound is used for converting macroelement disordered carbon in hair into the high-energy crystal carbon material, the process is simple, the time is short, the operation is safe, the production environment is loose, the production cost is low, the conversion rate is high, the purity is high, toxic and harmful waste is not generated, conventional waste liquid treatment is easy, environmental pollution is not caused, and the high-energy crystal carbon material with the purity of 98-99% or above is effectively obtained.

The invention discloses a PB composite modified material and a preparation method thereof and a water heater obtained from the PB composite modified material. The PB composite modified material is prepared from the following raw materials in parts by weight: 60-90 parts of PB resin, 5-30 parts of long glass fibers, 5-10 parts of calcined aluminum factory waste and 1-2 parts of processing aid. Theinvention further provides the preparation method of the PB composite modified material and water heater spare parts and the water heater obtained from the PB composite modified material. The long glass fibers and the calcined aluminum factory waste are adopted to modify the PB resin, the performance of the glass fibers is effectively protected from being damaged, the tensile strength of the materials is improved, the shrinkage deformation of the materials is reduced, the problem of pressure deformation of hot water system parts is solved, meanwhile, the flatness of the surfaces of the parts is improved, internal shrinkage holes of the parts are reduced, the compactness of the parts is improved, the strength of the parts is improved, and the sealing performance of connecting parts in a hotwater system is effectively improved.

The invention discloses a method for preventing a nodular cast iron roller core from loosening, and belongs to the technical field of metallurgy. The production process comprises the working procedures of smelting, molten iron modification treatment, pouring, heat preservation and heat treatment. In the heat treatment process, a high-temperature normalizing and two-stage destressing annealing heat treatment process is adopted, the normalizing temperature is 970-990 DEG C, and the normalizing time is 15-17 hours; the first-stage annealing temperature is 515-535 DEG C, and the heat preservation time is 11-13 hours; and the second-stage annealing temperature is 550-570 DEG C, and the heat preservation time is 11-13 hours. The problem that shrinkage cavities and shrinkage porosity are generated in the centrifugal composite nodular cast iron roller core is solved, the attenuation phenomenon of ultrasonic flaw detection is avoided, and the use requirements of users are met.

The invention provides an optimization method for designing a multi-lattice structure meeting local buckling constraint. The method comprises the following steps: firstly, introducing a concept of free material optimization, and finding out optimal elastic tensor distribution in all feasible elastic continuum; a matched grid structure is embedded in each macroscopic element through an elastic tensor approximately containing buckling constraint. In order to obtain a better structure, stresses in local units are introduced in particular. Finally, the lattice structure with good overall rigidity and local buckling resistance is obtained through the method, and therefore the mechanical property of the structure is improved.