48results about How to "Accelerated volume shrinkage" patented technology

The invention discloses a method for preparing a graphene reinforced copper base composite material. Uniformly mixed graphene and copper powder are covered by a thin pure copper chip; the pouring speed is not higher than 1 mm/s; the influence on the graphene dispersing process by flowing of molten copper in the pouring process is controlled; and the temperature of the poured molten copper is not lower than 1080 DEG C and not higher than 1200 DEG C. The method can prominently improve distribution of graphene in a copper matrix in the process of using a casting method to prepare the graphene reinforced copper base composite material, and enhances the material strength and hardness; the average hardness of the graphene reinforced copper base composite material in the method can reach above 80 HV; the electric conductivity under normal temperature is not lower than 80% IACS; and the heat conducting coefficient under normal temperature is not lower than 339 w/(mK).

The invention relates to a dynamic pressure electric pulse double-field control sintering furnace and a sintering method. The sintering furnace comprises a furnace body, a dynamic pressure system, a pulse current generator and a sintering controller. The furnace body is connected with the dynamic pressure system and the pulse current generator. The dynamic pressure system and the pulse current generator are both connected to the sintering controller. A die is arranged in the furnace body. The dynamic pressure system comprises an upper press head electrode, a lower press head electrode, an upper press head, a lower press head, a constant pressure control module, a dynamic pressure control module and a pressure master control module. The dynamic pressure system is connected with the sintering controller. The pulse current generator is connected with the upper press head electrode and the lower press head electrode and connected with the sintering controller as well. The sintering controller controls the dynamic pressure system and the pulse current generator to generate the adjustable dynamic pressure for a material to be sintered and conduct plasma pulse current sintering on the material to be sintered. The dynamic pressure electric pulse double-field control sintering furnace and the sintering method can be widely applied to sintering of the high-performance material.

The invention relates to the technical field of water-based paint, in particular to water-based acrylic acid shining paint. The water-based acrylic acid shining paint is composed of, by weight, 90-95 parts of a component A and 5-10 parts of a component B; the component A comprises water-based hydroxy acrylic resin, BEK-760, water-based aluminium powder, an anti-settling agent, cosolvent, neutralizer, a CAB aqueous solution with the mass fraction being 30%, 2959 and the balance water; the component B comprises water dispersion type polyisocyanates. According to the water-based acrylic acid shining paint, a paint film is high in drying speed, metallic pigment is uniformly arranged, the paint film is uniform in color, and excellent adhesion is achieved. The photoinitiator 2959 is added to the paint, in the construction process, the paint is sprayed at the same time of being cured through illumination of an ultraviolet lamp, the paint film is high in drying speed, meanwhile, 2529 can further promote system volume shrinkage, arrangement of the aluminium powder is facilitated, thereby a good arrangement effect is achieved, and the paint film can be uniform in color.

The invention relates to an ultra violet (UV) silk screen printing ink. The UV silk screen printing ink comprises components of, by weight, 54%-58% of Sartomer aliphatic polyurethane CN965, 24%-28% of Cytec acrylic ester activated monomers, 7%-10% of Ciba photoinitiators, 6%-8% of Ciba pigments, 0.5%-1.0% of Dow Corning surface flatting agents and 0.5%-1.0% of Dow Corning antifoaming agents, wherein the Cytec acrylic ester activated monomers are formed by mixing propoxylate oneopentylglycol diacrylate and ethoxylated trimethylolpropane triacrylate according to the ratio of 1: 1, adding the components into a stirrer to be dispersed until the temperature reaches 50 DEG C, and putting the components into a three-roller machine to be ground until the fineness of the components is smaller than or equal to 5 mu m. The UV silk screen printing ink is good in adhesive force and bending resistance performance.

The invention discloses a preparation process of synthetic quartzite imitating three-dimensional textures of natural stone. The preparation process comprises the following steps: a, manufacturing a mold, specifically, scanning textures on the surface of a natural stone plate and forming a graphic file; manufacturing a male die and a female die with three-dimensional concave-convex textures according to the graphic file; b, preparing a backing material, specifically, uniformly stirring raw materials of the backing material, wherein the raw materials of the backing material comprise resin, and the resin is unsaturated polyester resin; and c, pressing the backing material, specifically, uniformly spreading the backing material on the female die, strickling, vacuumizing, and carrying out vibration pressing. According to the preparation process of the synthetic quartzite imitating the three-dimensional textures of the natural stone, the prepared synthetic quartzite is strong in pattern texture three-dimensional sense, rich in color and comparable with the textures of the natural stone, and has the advantages of corrosion resistance, high strength, smoothness, difficulty in deformation and no delamination, and the problems that existing synthetic quartzite is poor in texture, strength and corrosion resistance are solved..

The invention relates to the technical field of antifouling coating materials, particularly to an epoxy grafted acrylate self-layering connecting paint and a preparation method thereof, wherein the epoxy grafted acrylate self-layering connecting paint comprises the following raw materials by mass: a bisphenol A type epoxy resin, an acrylate resin, an epoxy grafted acrylate resin, a thixotropic agent, a modifier, a pigment, a filler, a solvent and a curing agent. According to the invention, the epoxy grafted acrylate self-stratifying paint has excellent physical properties, can be matched withacrylate antifouling paints, obviously improves the connection performance, and can prolong the service life of the matched coating; and the connecting paint is low in preparation cost and wide in application range, and has high economic benefits.

The invention relates to a synthesis method of a spiro-compound 2,4,8,10-tetracarbonyl-3,9-dioxaspiro[5,5]undecane. The synthetic route is 1,3-dibromo-2,2-di(bromomethyl)propane, 1,3-magnesium dibromide-2,2-di(magnesium bromide methyl)propane, 1,3-dicarboxyl-2,2-di(acetoxy)propane, and 2,4,8,10-tetracarbonyl-3,9-dioxaspiro[5,5]undecane. The 2,4,8,10-tetracarbonyl-3,9-dioxaspiro[5,5]undecane can be used as a novel expansion curing agent for an epoxy resin to reduce the volume shrinkage of the system to 0-1%, thereby overcoming the defect of poor mechanical properties of the epoxy resin cured by aliphatic acid anhydride, and improving the problem of volume shrinkage of the material. The invention is mainly used in the fields of epoxy resin casting and composite materials thereof.

The invention discloses a construction technology of green concrete. The construction technology is characterized in that commercial concrete is delivered to a working surface by a concrete delivery pump and a concrete delivery pipeline; a stone storage silo is mounted above an opening between the tail end of the delivery pipeline of the commercial concrete and an inlet of a helical mixing delivery device; a rotational impeller is arranged at the lower end of a feeding opening of the stone storage silo; extra stones are added from the feeding opening, and are automatically distributed to the flowing commercial concrete by employing the rotation of the impeller driven by the flowing inertia of the flowing commercial concrete; and the extra stones and the flowing commercial concrete are mixed uniformly by the helical mixing delivery device to form the green concrete to be delivered to a spreader pipeline for spreading and pouring. Compared with a construction technology of the conventional commercial concrete, the construction technology of the green concrete has a series of advantages as follows: (1) phenomena of drying shrinkage and cracking are reduced greatly; (2) the green concrete has excellent mechanical property; (3) the volume stability is good; (4) the cement usage is saved to a great extent; and (5) the pumpability of the commercial concrete is not affected.

The invention discloses a method for eliminating sulfur dioxide in sulfited semi-finished fruits. The method comprises the following steps: S1, the sulfited semi-finished fruits are washed; S2, the sulfited semi-finished fruits are soaked in a citric acid solution under a heating condition; S3, the sulfited semi-finished fruits are bleached; S4, the sulfited semi-finished fruits are drained. The desulfurization process for sulfited semi-finished fruit raw materials of Cantonese preserved fruits has a good desulfurization effect, and the removal rate of residual sulfur in the semi-finished fruits is up to 88.59% and meets the national standard. Besides, the adopted citric acid solution is an ingredient of a color protection solution used in the early processing period of Cantonese preserved fruit and candied fruit products, has no influence on the semi-finished fruit raw materials, has a color protection effect on the semi-finished fruit raw materials and products and can reduce the sizes of the raw materials, improve the transparency and improve the appearance of the raw materials, the appearance of the desulfurized semi-finished fruits is good, and the boiling fastness of the semi-finished fruits is improved. Besides, the desulfurization process is simple and convenient, the desulfurization speed is high, desulfurization can be finished within 15-20 min, the cost is low, and the method has great significance in production and popularization of Cantonese preserved fruits.

The invention discloses a technological method for reducing the shrinkage rate of coal gangue-based insulating bricks in a roasting process, and relates to the technical field of building materials. The technological method specifically comprises the following steps of: 1) preparing a nano chitin dispersion liquid from shrimp shells; 2) adding multiwalled carbon nanotubes into a nanocellulose suspension, and adding alumina fibers and mullite fibers to obtain a fiber dispersion liquid; 3) uniformly mixing aluminum oxide sol and silicon dioxide sol to obtain composite sol; and 4) uniformly mixing the products obtained in the steps 1) and 2), drying an obtained mixture to obtain composite fibers, drying and screening coal gangue, fly ash and engineering spoil, adding water, adding the composite fibers and the composite sol, performing aging, adding expanded perlite, and carrying out compression molding, drying, and roasting. According to the production process provided by the invention, the volume shrinkage rate of the insulating bricks can be effectively reduced, and the deformation of the insulating bricks is reduced, so that the insulating bricks are not easy to crack in a high-temperature roasting process, and the performance of the insulating bricks is improved.