34results about How to "Fast Mechanical Properties" patented technology

The present invention is the recipe of three component polyurethane resin for insole. The polyurethane resin includes one component A of active hydrogen-containing mixture comprising long chain polyol polymer, chain expanding agent, cross-linking agent, surfactant, foaming agent and other assistants; one component B comprising polyester or polyether modified MDI pre-polymer; and one component C or catalyst component of glycol solution of triethylidene diamine. The polyurethane resin has density as low as 0.25-0.30 g / cu cm, capacity of making the product firm and good in appearance, and other advantages.

The invention relates to a dual-station hydraulic die forging machining system and a machining process. The machining system comprises a heat preservation furnace, a forging machine, a melt feed manipulator, a product grabbing manipulator, a transferring rail and a storage frame. The heat preservation furnace is arranged at one side of the forging machine, and the melt feed manipulator installed between the forging machine and the heat preservation furnace scoops melt from the heat preservation furnace and conveys to the forging machine for machining. The other side of the forging machine is provided with the transferring rail, and the product grabbing manipulator is installed between the forging machine and the transferring rail. The machining system can achieve multi-station full-automatic production, and is simple in layout, easy and convenient to operate, capable of qualifying work of two forging machines when only one operator is needed, capable of making use of resources in the greatest degree and saving labor cost, meanwhile capable of obviously improving production efficiency, stable in operation, and reliable in quality.

The invention provides a preparation method of rice hull powder / talcum powder composite reinforced starch-based degradable plastic. The preparation method comprises the following steps of I, weighing and taking starch, rice hull powder, talcum powder, polyvinyl alcohol, a plasticizer, a compound additive and water according to certain parts by weight: II, adding various weighed and taken raw materials into a mixer, and uniformly mixing, so as to obtain a mixed material; III, adding the mixed material into a double screw extruder, and extruding, so as to obtain the rice hull powder / talcum powder composite reinforced starch-based degradable plastic. The sources of the raw materials in the preparation method are wide; the preparation process is simple; the method is suitable for large-scale industrialized production. The rice hull powder / talcum powder composite reinforced starch-based degradable plastic prepared by adopting the preparation method provided by the invention has favorable mechanical performance, heat resistance and biodegradability, and has important significance in all aspects of environmental protection, resource development and the like.

The invention relates to a forging method and a forging device of a twice forcing molten forging wheel. The forging method of the twice forcing molten forging wheel is conducted circularly by the following steps: (1) materials smelting; (2) heat preservation deposit; (3) molten soup degassing; (4) the molten soup being injected into a lower die; (5) main piston forcing and pressure maintaining; (6) auxiliary piston forcing and pressure maintaining; (7) die sinking; (8) product transfer and deposit; (9) die cooling. Product quality is improved and molten soup dosage is reduced, and twice forcing is conducted to further improve inner structure refined grain of metals, and therefore the forging method and the forging device of the twice forcing molten forging wheel has the advantages of improving product mechanical property, tensile property and other overall properties, shortening product production time, increasing output, improving production efficiency and ex-factory percent of pass of products.

The invention discloses an aluminum alloy refining material and a preparation method and an application thereof and relates to the field of aluminum alloy modifiers. The aluminum alloy refining material comprises the following raw materials in percentage by weight: 5-8% of potassium fluoroaluminate, 7-11% of sodium fluoroaluminate, 3-5% of disodium hydrogen phosphate hydrate, 5-7% of potassium chloride, 4-8% of sodium chloride, 0.4-0.8% of barium acetate, 3-6% of barium nitrate, 0.2-0.9% of samarium fluoride, 0.2-0.9% of aluminum acetate, 6-8% of aluminum chloride, 15-20% of lepidolite compound powder and the balance of pure aluminum. The aluminum alloy refining material has the beneficial effects that the four modifiers of barium, sodium, lithium and samarium are combined according to thecharacteristics and a sintered body with a loose structure is prepared by adopting spray deposition and extrusion calcination in one step, so that the metamorphic activity is effectively retained andthe material has the characteristics of short metamorphic incubation period, long effective metamorphic time and stable metamorphic effect; and the lepidolite powder can serve as a modifier carrier for degassing and slag removal and the alloy hardness can be significantly increased by utilizing high hardness matters contained in the lepidolite powder.

The invention discloses a bamboo bridge deck, which comprises prestressed ribs and a plurality of superposed bridge deck sheets, wherein the prestressed ribs penetrate through the bridge deck sheets; two ends of the prestressed ribs penetrate through shim plates and are fixed and tightened by using anchorage devices to constrain the bridge deck sheets; and each bridge deck sheet is formed by sequentially joggling a plurality of single bridge decks made of bamboo veneers end to end, and the joggled parts of the two adjacent bridge deck sheets are staggered. The required width of the bridge deck is achieved in the transverse direction by the method for sequentially joggling the single bridge decks end to end in the cross section width of a bridge. The basic single decks of the bamboo bridge deck can be conveniently prefabricated in a factory and assembled on site to form the bamboo bridge deck; the construction process is simple and fast, and the construction materials are environment-friendly and are easily reclaimed; and the bamboo bridge deck is suitable for a combined structural bridge, and is a bridge deck capable of meeting the using functions and the durability.

The invention relates to a method for preparing electronic ink from light composite function ball at sub-optical wavelength. Mixing dispersant and organic solvent, oscillating with ultrasonic wave, adding light composite function ball at sub-optical wavelength and blending, thus obtaining light composite function ball suspension at sub-optical wavelength with bistability; then adding background dye and mixing, thus obtaining electrophoretic display liquid, namely the electronic ink; or dispersing the light composite function ball at sub-optical wavelength in organic solvent, oscillating with ultrasonic wave, heating to 105-120 DEG C, adding Tissuemat E gradually and blending, thus obtaining light composite function ball suspension at sub-optical wavelength with bistability; then adding background dye and dispersant and mixing, thus obtaining electrophoretic display liquid, namely the electronic ink. Electronic paper display units made from the electronic ink are of good mechanical property, wear resistance, pressure resistance, impact resistance and quick response, and the images produced have clear boundaries, high contrast grade and high resolution.

The invention relates to a bone tissue engineering gradient porous magnesium-based metal component body. The bone tissue engineering gradient porous magnesium-based metal component body is characterized in that an inner core prefabricated body, an outer layer prefabricated body and a middle layer prefabricated body are at least included, wherein the outer layer prefabricated body is located on theperiphery of the inner core prefabricated body and is in an annular shape, the middle layer prefabricated body is located between the inner core prefabricated body and the outer layer prefabricated body and is in an annular shape, the inner core prefabricated body, the middle layer prefabricated body and the outer layer prefabricated body are each provided with a pore, the pores of the inner coreprefabricated body, the middle layer prefabricated body and the outer layer prefabricated body communicate with one another, and the porosity rate of the inner core prefabricated body, the middle layer prefabricated body and the outer layer prefabricated body is sequentially decreased. The invention further relates to a preparation method. After the bone tissue engineering gradient porous magnesium-based metal component body is implanted into the human body, the different demands of dynamic matching between the degradation rate and mechanical properties at different times can be met.

The invention discloses a preparation method of phenolic resin used for hand lay-up fiberglass-reinforced plastic. The method comprises the following steps of: (1) adding phenol, polyhydroxy phenol, formaldehyde and a basic catalyst to a reaction kettle at a mol ratio of 1.0:(0.1-1.5):(0.8-2.0):(0.02-1.0), heating to 40-75 DEG C, carrying out reaction at a constant temperature for 2-10 hours, heating to 85-95 DEG C and continuing reacting for 1-5 hours to obtain a mixture; and (2) vacuum-distilling the mixture obtained in step (1) for dewatering to liquid viscosity 5000-10000 MPa.s / 25 DEG C. According to the invention, polyhydroxy phenol with more active hydroxyl groups compared with that of phenol is added during the synthesis process of phenolic resin, thus improving the solidifying speed of phenolic resin, shortening the solidifying time and improving production efficiency under the condition of identical solidifying agent addition amount; and high hydroxyl group content increases crosslinking points and improves mechanical properties of phenolic resin.

The invention relates to a preparation method of super-hydrophobic, super-oleophylic and ultralight sponge. The preparation method comprises two steps of performing functionalized processing on melamine sponge by using an impregnation method and performing a curing reaction after processing. The melamine sponge used by the invention has a large quantity of active functional groups such as hydroxyl groups and amino groups on the surface, the content of the hydrophobic active functional groups on the surface of the sponge is remarkably reduced after the active groups are chemically functionalized, which causes a result that the surface energy of the material is reduced, thus the sponge is endowed with super-hydrophobic and super-oleophylic effects, and a contact angle between the sponge and water exceeds 150 degrees; and the modified melamine sponge belongs to an ultralight material due to density. The method disclosed by the invention has the advantages that raw materials are low in price and easy to available, the process is simple and easy to operate, the large-scale preparation is easily realized, and the like. The sponge prepared according to the preparation method has the advantages of low density, excellent compression resistance, high oil absorbing speed, high oil absorbing rate, high oil and water separation selectivity and the like, is a novel and efficient ultralight-density oil and water separating material, and has a wide application prospect in the fields such as organic chemical reagent treatment, oil-containing wastewater treatment, and leaking crude oil recovery.

The invention provides a medical stent for a digestive system. The medical stent is obtained by 3D printing of a degradable polymer material, and at least comprises two continuous layers of three-dimensional grid structures in the radial direction, wherein the outer layer of three-dimensional grid structure is formed by printing a degradable polymer main material, the inner layer of three-dimensional grid structure is formed by composite printing of the degradable polymer main material and at least one degradable polymer auxiliary material, and the degradation of all the degradable polymer auxiliary materials is earlier than that of the degradable polymer main material; and in the inner layer of three-dimensional grid structure, the extension area of the continuous and continuous part of at least part of the degradable polymer main material in the axial direction of the whole medical stent on the radial cross section of the inner layer of three-dimensional grid structure is not less than 20% of the total area of the radial cross section of the inner layer of three-dimensional grid structure. The degradable medical stent is manufactured by means of a 3D printing process, fine adjustment of mechanical properties and control of drug release and degradation period are realized through planning of the main and auxiliary materials, and the overall performance of the more universal medical stent for the digestive system is optimized.

The invention provides an assembly type bamboo bridge. The assembly type bamboo bridge consists of bamboo longitudinal beams (1), bamboo transverse beams (2), bamboo panels (3), a transverse pre-stressing tendon (4) and a longitudinal pre-stressing tendon (16). All bamboos used by the assembly type bamboo bridge are soaked in a gum dipping tank which contains polyurethane resin and phenolic resin before being assembled, and boiled for 10-15 minutes at 100 DEG C-110 DEG C, wherein the volume ratio of the polyurethane resin to the phenolic resin is (2-2.5):1; and then, the bamboos are got out and dried, and a layer of waterborne polyurethane resin, a layer of polyurethane resin, a layer of waterborne polyurethane resin and a layer of resurcinolformaldehyde resin are uniformly coated on the outer surfaces of all bamboos in sequence. The assembly type bamboo bridge is large in structural strength, good in drawability, green and environment-friendly in used materials, standard in structural components, high in assembly degree, good in structural integrity, and capable of sufficiently bringing the advantages of the materials into play, and satisfying the normal use and durability needs of the bridge beam structure.

The invention is a shoe resin formulation for insoles, which belongs to polyester type three-component polyurethane resin. Component A is OH-based raw material, which is a mixture containing active hydrogen, mainly composed of long-chain polymer polyols, chain extenders, crosslinking agents, surfactants, foaming agents and other additives. Component B is NCO raw material, mainly MDI prepolymer modified with polyester or polyether. Component C is a catalyst, which is composed of triethylenediamine in ethylene glycol solution. The present invention adopts four kinds of polyester polyols in component A, changes the skeletons of the past two polyols, and adds two polyols of polyester polyols b and d, which is a major breakthrough in the skeleton and changes The structure of the material is changed, which also makes a fundamental change in the appearance and physical properties of the material. In addition, two kinds of foaming agents and two kinds of silicone oils are used, which greatly increase the foaming power and fluidity of the material, make the density of the product lower and more stable, and save the amount of material used. The density is also much lower than similar polyester products, the general density is 0.25~0.30g / cm3. Not only that, the present invention also improves the B component, which greatly reduces the shrinkage phenomenon of the product, the cortex is thicker, the appearance surface effect is better, and the product grade is improved. The product produced by the invention has fast setting, fast curing and short mold release time, which can be released from the mold in 2.5 to 3.5 minutes from the original 7 to 9 minutes, which greatly improves the production efficiency.

A medical stent for the digestive system, which is obtained by 3D printing of degradable polymer materials. It includes at least two continuous layers of three-dimensional grid structures in the radial direction. The layered three-dimensional grid structure is compositely printed by a degradable polymer main material and at least one degradable polymer sub-material, and the degradable polymer sub-material is completely degraded earlier than the degradable polymer main material, and the inner layer In the three-dimensional grid structure, at least part of the degradable polymer main material is continuous in the axial direction of the entire medical stent and the extension area of ​​the radial section of the inner three-dimensional grid structure is not less than that of the inner three-dimensional grid structure 20% of the total radial cross-sectional area. The present invention manufactures the above-mentioned degradable medical stent by means of 3D printing technology, realizes fine-tuning of mechanical properties, control of drug release and degradation cycle through the planning of primary and secondary materials, and optimizes the overall performance of a more versatile digestive system medical stent.

The invention discloses a dissolvable self-healing natural polymer hydrogel and a preparation method thereof. The natural polymer sodium alginate is used as a raw material, the functional monomer methacrylic acid is introduced, and an initiator and deionized water are used as auxiliary raw materials. , a natural polymer hydrogel (SAM) with excellent self-healing properties and solubility was prepared by a one-pot method. The hydrogel prepared by the invention has a fast self-healing rate, the healing is not limited by the section of the incision, and has good solubility. When the hydrogel is put into a certain amount of water, the hydrogel can be completely dissolved without residue , using it as a drug carrier, its release rate is stable, and the drug can achieve 100% complete release without residue. And the prepared hydrogel has good biocompatibility and degradability, and the dissolvable self-healing natural polymer hydrogel prepared by the present invention is used in the field of biomedical materials such as wound dressings, tissue and organ culture and biological scaffold materials. It has broad application prospects.

The invention relates to a gradient porous magnesium-based metal component body for bone tissue engineering, which is characterized in that it at least includes an inner core prefabricated body, a ring-shaped outer layer prefabricated body located on the periphery of the inner core prefabricated body, and an inner inner prefabricated body and an outer layer prefabricated body. Between the ring-shaped middle layer prefabricated body, the core prefabricated body, the middle layer prefabricated body and the outer layer prefabricated body all have pores, and the pores of the three are connected, and the inner core prefabricated body, the middle layer prefabricated body The porosity of the body and the outer prefabricated body decreases sequentially. The invention also relates to a preparation method. After being implanted in the human body, it can meet the different requirements for dynamic matching between degradation rate and mechanical properties in different periods.