6results about How to "Improve initial strength" patented technology

The invention provides a degradable antibacterial bioactive interface screw and a manufacturing method thereof. The interface screw comprises a screw shell, a head part, a rod part with external threads and a tail part are sequentially arranged in the axial direction of the screw shell, and the tail part is of a conical structure; an inner core penetrating through the rod part is arranged in the screw shell, the inner core is of a network-shaped porous structure, and a release hole channel communicating with the inner core is formed in the outer surface of the rod part; the inner core is filled with an antibacterial functional body, the antibacterial functional body comprises gallium-silver composite antibacterial particles, and the gallium-silver composite antibacterial particles are released into the external environment of the screw shell through the release hole channels. According to the technical scheme, the interface screw can promote bone-ligament interface healing, controllable release of antibacterial components is achieved, the structure can be flexibly adjusted through a digital model, and the interface screw is suitable for personalized ligament reconstruction operations.

The application discloses a kind of goaf filling cementitious material, filling test block and preparation method thereof, and the mass ratio of the goaf filling cementitious material is as follows: stone coal vanadium extraction tailings 50-70%, stone coal vanadium extraction neutral residue 5-20%, smelting slag 0-15%, cement clinker 10-30%, and activator 2-8%.The filling test block also includes full tailings filling material and tap water, the mass percentage of the tap water is 18-30%, and the mass ratio of the goaf filling cementitious material to the full tailings filling material is 1:12-1:4.The goaf filling cementitious material uses stone coal vanadium extraction tailings as the main raw material, can be applied to mine tailings filling nearby, helps to large-scale, stable absorption of vanadium tailings, avoids the problems caused by tailings accumulation, and has a positive effect on the green development of mine and the friendly development of mining industry and social environment.The preparation method of the goaf filling cementitious material is simple, the main raw materials used can be obtained nearby, which helps to reduce the production cost of the cementitious material.

This invention discloses a room-temperature bio-based asphalt cold patch and its preparation method. The cold patch comprises 96.5-98 wt% recycled asphalt pavement material and 2-3.5 wt% bio-based asphalt cold patch liquid. The cold patch liquid comprises 60-70 wt% base asphalt, 10-20 wt% bio-based diluent, and 20-30 wt% bio-based regenerator. The preparation method includes the following steps: preparing epoxidized soybean oil methyl ester and hydrogenated ricinoleate methyl ester; mixing vegetable oil and its derivatives, fatty acids and their esters, natural small-molecule organic components, and oxalic acid at room temperature to obtain a bio-based diluent; heating the base asphalt to a fluid state and adding the bio-based regenerator, followed by cooling and adding the bio-based diluent to obtain the cold patch liquid; and adding the cold patch liquid to the recycled asphalt pavement material and mixing to obtain the cold patch. The bio-based asphalt cold patch of this invention has high initial strength, high pavement stability after repair, and significantly reduces the rework rate and the probability of recurring defects.

This invention relates to the field of magnesium alloy preparation technology, specifically to a high-strength, high-ductility, multi-scale hierarchical heterostructure magnesium alloy and its preparation method. The magnesium alloy, by weight percentage (100%), comprises the following components: Mg: 65-70%, Sc: 20-33%, with the balance being Gd. The preparation method includes: S1, weighing Mg, Sc, and Gd metals, and vacuum melting to obtain a magnesium alloy ingot; S2, solution treatment and aging to precipitate needle-like secondary α phase within the β phase; S3, high-temperature hot rolling to promote dynamic recrystallization; S4, heat treatment to adjust the biphase structure ratio of the magnesium alloy, promoting the precipitation of nano-B2-rich Sc particles and L12-rich Gd nano-precipitates, followed by cold quenching to room temperature to obtain a hierarchical heterostructure magnesium alloy. The hierarchical heterostructure prepared by this invention has a maximum tensile strength of 493 MPa, a maximum yield strength of 439 MPa, and a maximum elongation after fracture of 40.8%. This invention, through heat treatment process control and Gd alloying, produces a hierarchical heterostructure magnesium alloy with excellent comprehensive mechanical properties.

The invention provides a single-component polyurethane material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The polyurethane material is prepared from the following raw materials in parts by weight: 40 to 60 parts of mixed polyurethane prepolymer, 2 to 4 parts of polyester polyol, 4 to 20 parts of plasticizer, 0.5 to 1.5 parts of compound catalyst, 0.5 to 2 parts of coupling agent and 25 to 50 parts of filler, wherein the mixed polyurethane prepolymer is an MDI (methylene diphenyl diisocyanate) prepolymer and an IPDI (isophorone diisocyanate) prepolymer; the compound catalyst is a mixture of a tin catalyst and an amine catalyst. The single-component polyurethane material is high in initial strength, better in construction thixotropy and lower in raw material cost, the curing speed is obviously higher than that of a traditional single-component polyurethane material under the same surface drying time, and the final strength and the elongation at break of the product are obviously higher than those of the traditional single-component polyurethane material.

This invention relates to the field of soft-light tile technology, and in particular to an environmentally friendly and wear-resistant soft-light tile and its preparation method. The components, by weight, include 20-40 parts quartz, 30-60 parts waste slag powder, 10-25 parts feldspar, 10-20 parts kaolin, 5-15 parts clay, 5-15 parts talc, 5-15 parts lamellar alumina, 1-5 parts sintering aid, and 0.5-3 parts binder. This invention employs the aforementioned environmentally friendly and wear-resistant soft-light tile and its preparation method, combining waste slag powder and lamellar alumina with other components. This breaks through the traditional single-aggregate reinforcement mechanism. The preparation process uses a two-stage sintering process, resulting in a stronger bond between the glaze and the body, a more uniform surface texture, and greater controllability of the soft-light effect.