213results about How to "Solve the brittleness problem" patented technology

The invention discloses a high-flexibility melamino-formaldehyde foam material and a preparation method thereof. The preparation method comprises: firstly, preparing melamino-formaldehyde prepolymer modified by polyol into aqueous solution with definite weight concentration; weighting 100 parts by weight of prepolymer aqueous solution; adding 0-15 parts by weight of surfactant, 1-20 parts by weight of foaming agent, 0-10 parts by weight of accelerator and 0-10 parts by weight of curing agent to be fully stirred and mixed to prepare foaming liquid; filling foaming liquid into a microwave chemical reactor or a high-temperature oven; and foaming for 30s-15min at the temperature of 100-300 DEG C to prepare the foam material. The melamino-formaldehyde foam material disclosed by the invention solves the problems of big brittleness, poor flexibility, easy duslting of foam, complex preparation technology, high production cost and the like of the existing melamino-formaldehyde foam material and has wide application prospect.

The invention relates to a preparation technique of a wood plastic composite material, in particular to a method for preparing a wood plastic composite material by using modified wood powder and waste plastics. The method is characterized in that: (1) discarded agriculture and forestry wastes are crushed, milled and dried, and three different surface modification agents are added in sequence and mixed with the waste power one after another in a high-speed mixer to produce the modified water powder; and (2) waste plastics are washed and crushed into granules with the grain size of 2mm to 12mm and then dried; the modified waste powder, the waste plastic granules, a lubricant, a vesicant and a blowing promoter are mixed by weight percentage and put into the high-speed mixer for high-speed mixing and then cooled to the temperature lower than 55 DEG C for discharging so as to prepare a special premix. The composite material has super high strength and anti-bending and anti-impact capacity, wherein, the obvious enhancement of the anti-impact strength causes the great enhancement of the processing capacity of the product, thus causing products to meet different demands and ensuring an extremely wide application range.

A modified wood-plastics composition is prepared from wood flour, plastic, assistant, and grafting agent through graft modifying of wood flour and plastics, and continuous extruding out. Its advantage is high tension strength, bending strength and impact strength.

The invention relates to a thermal-insulating anti-flaming building material and a preparation method thereof. The thermal-insulating anti-flaming building material comprises the following components by weight parts: 45 to50 parts of lightweight aggregates, 45 to 50 parts of inorganic gelled materials, 5 to 10 parts of toughening agents, 3 to10 parts of interface modifying agents and 0.5 to 2 parts of dispersing agents. The quick coagulating function and the closing function of the interface modifying agents are utilized to perform hole-closing treatment on the surfaces of the lightweight aggregates; fibrous inorganic whisker materials with big ratio of length to diameter are selected as the toughening materials; the defects of inferior thermal-insulating effect and fragile property of the inorganic thermal-insulating material are thoroughly overcome; all the raw materials of the thermal-insulating anti-flaming building material are selected from A-level anti-flaming materials and areexcellent in anti-flaming effect; and the production process for the thermal-insulating anti-flaming material is simple and short, is continuously operated, is easily performed and controlled and is beneficial to industrialized application.

The invention discloses a processing method of an instant seasoning lotus root, which comprises the steps that a fresh lotus root is cleaned, peeled, sliced, then subjected to primary color protection and crisp keeping, rinsed, seasoned, subjected to secondary color protection and crisp keeping, seasoned, packaged and sterilized at a high temperature, and the instant seasoning lotus root is obtained. The processing method is simple and efficient; the color protection and crisp keeping are conducted simultaneously in the primary color protection and crisp keeping step; the secondary color protection and crisp keeping step is merged into the seasoning step, so that the time is saved and the effect is good. As a vacuum curing method is adopted, the curing time is saved; the appearance of an obtained lotus root sheet is creamy white; and the lotus root sheet has luster and a delicious and crisp taste. Compared with the prior art, the delicious and crisp taste is improved, and the lustrousness is better.

The invention discloses a preparation method of a superfine crystal lead-free delay element for a detonator. The preparation method comprises the following steps: firstly, preparing a superfine crystal Zn-Al alloy blank pipe by adopting casting, extrusion, rolling and machining; then drawing or rolling the superfine crystal Zn-Al alloy blank pipe with delay powder to form a Zn-Al alloy pipe; and finally, cutting and packaging the prepared Zn-Al alloy pipe so as to obtain the Zn-Al alloy delay element. Through using the technical scheme of the invention, lead pollution is avoided, use occasionis not limited, and production process is safer.

The invention relates to a photo-thermal dual-curing anisotropic conductive adhesive film and a preparation method thereof. The anisotropic conductive adhesive film is prepared from raw materials in percentage by mass as follows: 35%-45% of epoxy resin, 10%-25% of acrylic resin, 5%-10% of a cross-linking agent, 2%-7% of a diluent, 0.6%-1% of a photoinitiator, 2.5%- 4% of a thermal curing agent, 5%-10% of an accelerant, 0.5%-2% of a silane coupling agent and 20%-35% of conductive balls. The preparation method comprises steps as follows: the raw materials are blended, subjected to rotary coating and then subjected to ultraviolet exposure processing, and the anisotropic conductive adhesive film is prepared. The anisotropic conductive adhesive film has good conductive performance, excellent weather fastness, low curing temperature, long storage time, high curing degree and high bonding strength; the preparation process is simple, the cost is low, and the application prospect is broad.

The invention relates to a preparation technology of wood-plastic composite materials and particularly relates to a method of preparing a wood-plastic composite material with modified wood powder and waste plastic. The method includes the steps of (1) crushing, milling and drying agricultural and forestry wastes, successively adding three different surface modifiers and successively mixing the surface modifiers with the waste powder in a high-speed mixing machine to prepare a modified waste powder; (2) cleaning the waste plastic, crushing the waste plastic into granules being 2-12 mm in size, and drying the granules; and (3) according to weight percentage ratio, feeding a mixture composed of the modified waste powder, the waste plastic granules, a lubricant, a foamer and a foamer aid into the high-speed mixing machine to perform high-speed mixing, cooling the mixture until the temperature is lower than 55 DEG C and discharging the material to prepare a special premix. The composite material is very high in strength and anti-bending and anti-impact performance, wherein the anti-impact strength is significantly improved so that the composite material is greatly improved in processability, and further can be used for producing products satisfying different demands. The composite material is greatly wide in application range.

The invention belongs to the technical field of three-dimensional printing photosensitive resin materials, and discloses a three-dimensional printing photosensitive resin material containing solid rubber. The photosensitive resin material is prepared from, by mass, 1%-20% of the solid rubber, 30%-80% of acrylic resin, 10%-40% of diluents, 1%-5% of initiators and 1%-5% of accelerants. The photosensitive resin material has the advantages that the solid rubber NR-MAH-HEMA is synthesized, the brittleness problem of photosensitive resin for three-dimensional printing on the present market is effectively solved by introducing rubber molecules, and the rubber molecules are added into the photosensitive resin material as the solid parts through a technical mean that the rubber molecules are frozen with liquid nitrogen and then ground; use is easy, the material source is wide, and the toughness of the photosensitive material is greatly improved. The invention further discloses a preparation method of the three-dimensional printing photosensitive resin material containing the solid rubber.

The invention discloses a poly(butylene succinate) which is prepared by copolymerizing succinic acid, butylene glycol and cyclic dibasic alcohol. The poly(butylene succinate) comprises succinic acid residue, butylene glycol residue and cyclic diol residue, wherein the butylene glycol residue accounts for 90-98% of the total dibasic alcohol, and the cyclic diol residue accounts for 2-10% of the total dibasic alcohol. The preparation method comprises the following steps: reacting succinic acid, butylene glycol and cyclic dibasic alcohol at 200-230 DEG C under the action of a catalyst to perform direct esterification, thereby obtaining an esterified substance; adding a stabilizer, and carrying out pre-polycondensation reaction at 220-250 DEG C to obtain a prepolymer; carrying out polycondensation reaction on the prepolymer at 235-250 DEG C while gradually reducing the vacuum degree of the reaction system to less than 150Pa; and after the polycondensation finishes, adding carbodiimide compounds into the reaction product, and mixing for 2-15 minutes, thereby obtaining the poly(butylene succinate). The polyester synthesized by the method disclosed by the invention has the advantages of high heat resistance, high melting point, controllable degradation rate, excellent mechanical properties and excellent processability.

The invention relates to a foamable phenolic resin strengthening and filling material for coal mine. In the foamable phenolic resin strengthening and filling material for coal mines, a component A is one of inorganic acid and organic acid or a mixture of inorganic acid and organic acid; and a component B is prepared by mixing 90 to 100 weight parts of urea modified phenolic resin with solid content of 65 to 90 weight percent, 6 to 10 weight parts of composite fire retardant, 0 to 15 weight parts of foaming agent, 1 to 5 weight parts of stabilizing agent, 1 to 15 weight parts of cosolvent, 2 to 16 weight parts of antistatic agent and 10 to 30 weight parts of plasticizer, stirring at the temperature of between 30 and 50 DEG C and reacting for 0.5 to 2 hours. When the foamable phenolic resin strengthening and filling material is used, the component A and the component B are mixed and injected into a coal (rock) layer according to the weight ratio of (1-2) : 1 and permeated into small cracks to expand and generate curing reaction for strengthening and sealing the region. According to the foamable phenolic resin strengthening and filling material for coal mines, the compressive strength is more than 40 MPa; the bonding strength is more than or equal to 3.0 MPa; and the foaming coefficient is less than or equal to two times. The foamable phenolic resin strengthening and filling material for coal mines can meet the requirement of coal mine on safety production and can be applied to the industries such as hydroelectric powder, buildings, mining, traffic and the like.

The invention discloses an MAX phase ceramic pipe and a preparation method thereof as well as a nuclear fuel cladding tube. The preparation method comprises the following steps: S1, weighing the following raw materials in percentage by mass: 5 to 15 percent of binding agent, 5 to 15 percent of plasticizing agent and 2 to 15 percent of fiber toughening phases; adding the raw materials into deionized water to prepare turbid liquid; S2, adding the turbid liquid into MAX phase nano-powder to prepare slurry of which solid content is 60 to 90 percent; S3, making the slurry into an MAX phase ceramicpipe blank by adopting an extrusion molding method; S4, performing pressureless sintering on the MAX phase ceramic blank to prepare the MAX phase ceramic pipe. The MAX phase ceramic pipe disclosed bythe invention is suitable for the accident fault-tolerant nuclear fuel cladding, so that the anti-accident ability that nuclear reactors maintain nuclear fuel assembly structures and function completeness under a serious accident working condition is greatly improved.

This invention relates to a process method to make stainless steel tube without gap, which comprises the following steps: providing the required steel ingot; forging; heating tube blank; drilling and rolling; processing the rolling, empty sinking, cold-drawing; again empty sinking, final product annealing and final product making.

The invention discloses a full depth buoyancy regulating seawater pump, which mainly comprises a flat valve module, a plunger piston shoe module, a plunger sleeve, a force transfer and reset mechanism and a pressure compensator, wherein the pressure compensator is used for balancing a lubricating cavity and environmental stress; the force transfer and reset mechanism drives the plunger piston shoe module to alternately cycle for a pressing travel and a sucking travel, so that the flat valve module alternately cyclically sucks water and presses water; the plunger piston shoe module has a fixed interval forced reset structure, so that a plunger is reset reliably; the force transfer and reset mechanism has a bidirectional stress structural design, so that the seawater pump meets the special working condition of regulating the buoyancy by the hydraulic pressure of seawater; and a stepped plunger is adopted, large and small plungers are connected through a spherical hinge, and the problems of strength design, sealing and frictional wear of the crucial friction pair, namely an ultrahigh pressure seawater pump are solved. The full depth buoyancy regulating seawater pump can regulate the buoyancy of a submersible in sea areas with all depth, and has the characteristics of simple structure, high applicability and working reliability.

The invention discloses silicon carbide composite wave absorbing ceramic based on a metamaterial. The silicon carbide composite wave absorbing ceramic is composed of a silicon carbide composite layer, an antioxidant bonding layer and a metamaterial layer from inside to outside in sequence. The silicon carbide composite layer is composed of a three-dimensional knitted part reinforced silicon carbide composite sewn through continuous silicon carbide fiber plain cloth in the Z direction, and the fiber electrical resistivity of the composite ranges from 10<5> omega.cm to 10<6> omega.cm; the antioxidant bonding layer is composed of a cordierite coating, and the metamaterial layer is formed by periodically arranging resistance coatings of capacitive or inductive periodic patterns. The advantages of achieving wide frequency and low frequency wave absorption, being resistant to high temperature, high in wave absorbing performance regulation and control performance, achieving bearing and the like are integrated, the technical problem of poor low frequency wave absorbing performance troubling a high-temperature wave absorbing material all the time is solved, the structure is simple, implementation is easy, and high designability is achieved. The invention further discloses a preparation method of the silicon carbide composite wave absorbing ceramic based on the metamaterial. The raw materials are easy to obtain, and engineering application is convenient.

The invention belongs to the technical field of photosensitive resin materials for 3D printing, and discloses a 3D printing photosensitive resin material containing modified butadiene rubber. The 3D printing photosensitive resin material containing the modified butadiene rubber is prepared from, by mass, 10%-30% of the modified butadiene rubber, 30%-80% of acrylic resin, 10%-40% of diluents, 1%-2% of initiators and 1%-2% of accelerants. A polybutadiene telechelic polymer with a terminal hydroxyl group is obtained through anionic polymerization, esterification is conducted on the polybutadiene telechelic polymer and acrylic acid, and a double-bond group is introduced; the 3D printing photosensitive resin material containing the modified butadiene rubber has the advantages that by means of an anion synthetic method, a polymer with the molecular weight narrower in distribution is obtained, processing is facilitated, a ubiquitous brittleness problem is effectively solved by introducing a rubber chain segment, and after esterification is conducted on the acrylic acid which is one of original systems of the photosensitive resin and double bonds are introduced, the compatibility problem is thoroughly solved. The invention further provides a preparation method of the 3D printing photosensitive resin material containing the modified butadiene rubber.

The invention relates to a method for improving the brittleness of surface layers of small-package fried fish cakes before eating, and belongs to the field of a convenient food processing technology. The method comprises the steps of selecting fresh fish meat, rinsing, dehydrating and then adding a certain amount of a water-retaining agent into the fish meat for blending; adding seasonings into the fish meat, forming and carrying out gelatinization for 1h; finally, coating a layer of brittleness-increasing starch slurry on the outer side of each fish cake, and frying the fish cakes to prepare the fried fish cakes; quick-freezing the fried fish cakes, and refrigerating to obtain semi-finished products of fish cakes which can be cooked by a microwave oven; reheating the prepared semi-finished products of fish cakes which can be cooked by the microwave oven and contain the brittleness-increasing starch slurry on the surface layers for 90s by adopting 915MHz low-frequency microwaves, so as to enable the brittleness of the small-package fried fish cake to be improved by 20-27% compared with fish cakes which are not subjected to brittleness improving. After the method is adopted, the trouble of repeatedly frying the fish cakes can be omitted, the fish cakes can be eaten after being re-heated by using the low-frequency microwaves, the brittleness of the surface layers of the small-package fried fish cake can be improved, the oil content of the small-package fried fish cake can be reduced, the processing time is shortened, the working efficiency is improved, the fish meat processing market can be relatively well expanded, and the good economic benefit is generated.

The invention discloses a method for preparing a multihole infrared chalcogenide glass photonic crystal optical fiber preform. According to the method, a high-precision optical two-dimensional positioning platform is adopted for fixing a glass bar for mechanical drilling, various series of air holes can be accurately drilled, and the defect of inaccurate arrangement of the air holes by a stacking and drawing method and a casting method is solved. By utilizing the method, a diamond twist drill is adopted in the drilling process, a glass material is cut by a sharp spiral knife-edge in the high-speed revolution process, an efficient cooling system is adopted in the drilling process, heat generated in the drilling process is efficiently taken away by constantly flowing cooling liquid, and heat of the photonic crystal optical fiber preform in the drilling process is conveniently dissipated. Based on the reasons, the method is suitable for preparing the chalcogenide glass photonic crystal optical fiber preform with high expansion factors. By utilizing the method, the problem of embrittlement due to too large expansion coefficient difference between chalcogenide glass and a quartz tube in the casting method is solved.