25results about How to "Small shrinkage" patented technology

The application relates to the technical field of roadbed engineering, in particular to a roadbed filler based on high-water-content gold flotation tailings and a preparation method thereof.A roadbed filler based on high-water-content gold flotation tailings is prepared from the following raw materials: gold flotation tailings, modified precipitation material, curing agent, activator, solid modifier and anti-cracking agent; the water content of the gold flotation tailings is lower than 20%; in the application, the porous precipitation material and the low-carbon cementing material are used to perform pre-dehydration treatment and efficient curing treatment on the high-water-content gold flotation tailings, so that the roadbed filler with low carbon and low cost and with high strength and low shrinkage is obtained.

The invention discloses an electroplating-grade polypropylene composite material and a preparation method thereof. The composite material is prepared from the following raw materials in percentage by weight: 30-70% of co-polypropylene; 20-40% of a coarsening agent; 0-30% of a filler; 0-30% of an elastomer toughening agent; 0-3% of a compatilizer; 0.1-2% of a stabilizer; and 0-5% of other additives. Through the synergistic effect of the coarsening agent and the filler, the rigidity and toughness of the composite material are guaranteed, meanwhile, the composite material has an excellent electroplating effect, application of a finished product is guaranteed, and compared with electroplating-grade PC / ABS and ABS materials, the composite material is lower in price and cost and has a good application prospect.

The invention belongs to the technical field of building materials, and discloses a cement-based composite material based on multistage toughening and intelligent repairing and a preparation method thereof.The cement-based composite material comprises finished product dry powder, an additive and mixing water, and the finished product dry powder comprises, by mass, 400-500 parts of ordinary Portland cement, 50-100 parts of mineral powder and 20-60 parts of nano metakaolin; the invention relates to a water-based composite material which comprises the following components in parts by weight: 15-35 parts of epoxy modified redispersible latex powder, 1-5 parts of pre-water-absorbing SAP microspheres, 0.5-1.5 parts of PP fibers, 0.5-1.5 parts of PVA fibers, 800-900 parts of machine-made sand, 1-3 parts of surface-treated shape memory alloy short fibers and 3-8 parts of elastic polymer microspheres. The additives comprise a geopolymer prefabricated liquid, a water reducing agent, a defoaming agent and a retarder, and the mass ratio of the finished product dry powder to the geopolymer prefabricated liquid to the mixing water to the water reducing agent to the defoaming agent to the retarder is 100: (25-28): (8-10): (5-10): (1-3): (0.5-2). Compared with the existing material, the cement-based composite material provided by the invention has the characteristics of high toughness, impact resistance and low shrinkage, and also has an internal repair function.

The application discloses a kind of stone cultural relics's repair equipment and surface repair method, it is related to cultural relic repair technical field, including the placing table for placing cultural relics to be repaired, still including visual scanning unit, control unit, material supply and premix unit and execution perfusion unit, material supply and premix unit are electrically connected with control unit, this unit includes bacteria liquid warehouse, cementing liquid warehouse, pH regulator warehouse, dilution buffer solution warehouse, powder slurry warehouse and a batch processing type mixing tank, above-mentioned each warehouse body is communicated with batch processing type mixing tank, for supplying repair raw material as needed.The application realizes the adaptive repair to crack morphology;Through batch, variable concentration perfusion strategy, the problem of uneven filling caused by traditional one-time perfusion is solved;Through the cooperation of elastic stirring blade in batch processing type mixing tank and self-bleeding air pressure structure, efficient switching of mixing and discharging and automatic cleaning of pipeline are realized, the accuracy and reliability of multi-batch perfusion process are ensured.

The utility model discloses an operating angle adjustable hedge trimmer, including the rear shell of being equipped with rotating axle and the front shell of rotating bushing on rotating axle and being equipped with a plurality of limit mouth, install the elastic member of sliding limit rotation piece and the elastic member of backward elastic action limit rotation piece on the rear shell, be equipped with the clamping portion of clamping in limit mouth on limit rotation piece, be equipped with the rear handle of extending before and after on the rear shell, limit rotation piece is equipped with the compression part of being located rear handle front lower position, press the compression part of limit rotation piece, the clamping portion of limit rotation piece can slide and separate limit mouth, and the front shell can rotate and adjust with the rear shell. Compared with the prior art, the utility model has the advantages that through the push operation of limit rotation piece, the rotation restriction between the front shell and the rear shell can be unlocked, the action amplitude of push operation is small, the action path is simple, short distance direct push is realized, unnecessary muscle contraction is reduced, fatigue can be reduced, unlocking operation is more labor-saving, and fatigue during repeated operation is reduced.

The invention provides microporous low-shrinkage concrete and a preparation method thereof, and belongs to the field of concrete.The microporous low-shrinkage concrete is prepared from, by weight, 300-380 parts of cement, 30-70 parts of fly ash, 250-350 parts of medium sand, 1200-1550 parts of guar stone, 5-10 parts of silica fume, 2-4 parts of dihydrate gypsum, 0.5-2 parts of water glass, 2-5 parts of a water reducing agent, 0.1-0.3 part of a retarder, 4-8 parts of rubber powder, 0.02-0.08 part of a thickening agent and 2-6 parts of water absorption fibers. 110 to 150 parts of water; and the porosity of the microporous low-shrinkage concrete is 8-10%. Through innovative material design and a synergistic effect, comprehensive improvement of waterproofness, crack resistance, construction performance and economical efficiency is achieved, seepage water can be changed from blocking to dredging through a unique micropore structure, and the efficient and durable anti-seepage effect is achieved; meanwhile, the stability of a base layer is guaranteed through high strength, strong bonding force is formed with a surface layer, and hollowing and cracking are effectively eradicated; in addition, the water-absorbing fiber internal curing component and the expansion component cooperate, so that the cracking risk is avoided, and the long-term stability and safety of the floor system are guaranteed.

The present application relates to the technical field of 3D printing concrete, and discloses a preparation method of 3D printing concrete mixed with plant fibers, which comprises the following steps: step 1, soaking and drying the plant fibers treated with water glass in saturated limewater; step 2, blending the plant fibers with sulphoaluminate cement; step 3, preparing alkali-activated 3D printing concrete and pumping it by taking 30-50 parts of water glass, 20-40 parts of sodium hydroxide, 100-200 parts of limestone powder, 1000-1200 parts of sand, 100-200 parts of extra-fine sand, 400-500 parts of mineral powder, 50-150 parts of rice husk ash, 20-40 parts of hydroxypropyl methyl cellulose, 220-300 parts of water and 5-10 parts of water reducing agent according to mass fraction; step 4, forcibly stirring the concrete and adding the product obtained in step 2; and step 5, printing the concrete and spraying a setting agent between the concrete layers. The present application helps to improve the constructability of 3D printing concrete and reduce its shrinkage.

The invention discloses an anti-cracking cement stabilized macadam mixture for a plateau road and a preparation method of the anti-cracking cement stabilized macadam mixture. The anti-cracking cement stabilized macadam mixture is prepared from the following raw materials in parts by weight: 3-5 parts of anti-cracking cement, 40-60 parts of modified high-titanium slag macadam, 25-45 parts of modified high-titanium slag sand and 11-15 parts of mixing water. According to the cement stabilized macadam mixture disclosed by the invention, low shrinkage of a cement hydrated hardened body is realized by virtue of the anti-crack cement, and the problem of rapid water loss of a hydration system caused by high-air-pressure and strong-wind drying in a plateau is solved by utilizing the internal curing effect of the modified high-titanium slag macadam; the early freezing resistance of the system is improved by introducing an early-strength anti-freezing component calcium formate into the modified high-titanium slag sand, so that the drying shrinkage and temperature shrinkage of the cement stabilized macadam are integrally reduced, the freezing resistance is improved, the durability of the cement stabilized macadam in a harsh and complex environment of a plateau is improved, and the service life of the cement stabilized macadam is prolonged.

The application discloses a temperature control type shrinkage compensating admixture for concrete and application thereof and belongs to the technical field of concrete admixtures. The admixture comprises the following components in percentage by mass: expansion component 52-70%, modifier 8-13%, temperature-sensitive controlled release component 10-15% and water-retaining component 10-20%; the modifier comprises aluminum phosphate and / or aluminum titanate; the temperature-sensitive controlled release component comprises a hydration heat inhibiting component and a temperature-sensitive polymer wrapped on the surface of the hydration heat inhibiting component, and the temperature-sensitive polymer is polymerized from N-isopropyl acrylamide and N,N-dimethyl acrylamide. The admixture effectively reduces the shrinkage of concrete and significantly reduces the generation of cracks in the above aspects by compensating shrinkage through the expansion component, reducing temperature shrinkage through the modifier and the temperature-sensitive controlled release component and promoting the closing effect of the temperature-sensitive controlled release component through the water-retaining component.

This invention discloses a method for preparing diamond / W-Cu composite materials using binder jet 3D printing technology. The preparation method includes the following steps: (1) adding diamond / W-Cu mixed powder into a printing device and printing a diamond / W-Cu green blank using a binder jet 3D printing device; (2) placing the diamond / W-Cu green blank into a tube furnace, placing a Cu block for melting and infiltration below the green blank, and performing melting and infiltration under an argon atmosphere to obtain the diamond / W-Cu composite material. This invention adds diamond to the W-Cu composite material, utilizing the high thermal conductivity of diamond to improve the thermal conductivity of the W-Cu composite material. Simultaneously, the prepared diamond / W-Cu composite material exhibits low shrinkage and high dimensional accuracy, making it particularly suitable for near-net-shape forming of complex shapes. This improves the designability and processability of the diamond / W-Cu composite material, and the preparation process is simple with low production costs.

This application discloses a steel pipe jacking core filling material and its preparation method. The raw materials of the steel pipe jacking core filling material in this application include gel material, coarse aggregate, fine aggregate, wetting and dispersing agent, and water. The weight of the wetting and dispersing agent is 1.0-1.5% of the total mass of the gel material. The wetting and dispersing agent is compounded from maleic anhydride copolymer and organic bisacrylic surfactant. The cementing material includes cement, mineral powder, and fly ash. The molecular structure of the maleic anhydride copolymer is comb-shaped. The molecular weight of the main chain of the maleic anhydride copolymer is 5000-100000 g / mol, and the molecular weight of the side chain of the maleic anhydride copolymer is 100-500 g / mol. The molecular structure of the organic bisacrylic surfactant is comb-shaped. The molecular weight of the main chain of the organic bisacrylic surfactant is 5000-100000 g / mol, and the molecular weight of the side chain of the organic bisacrylic surfactant is 2000-5000 g / mol. The filler material in this application has better fluidity and density properties, and better volume stability, which can meet the dual requirements of mechanical properties and durability of lifting filler materials.

The invention relates to a production process and application of low-twist high-strength woven yarn, and belongs to the field of textile engineering. According to the technology, a multi-stage false twisting device is arranged between a front roller and a yarn guide hook of a traditional ring spinning frame, and by controlling the contact angle between a false twister and yarn, the false twisting speed ratio and tension distribution, the strength of the single yarn is remarkably improved under the low-twist condition (the twist coefficient is reduced by 20%-35% compared with the conventional twist coefficient). The double-zone control technology of front false twisting and rear tension balance is adopted, the dynamic strength of a spinning triangular zone is enhanced by more than 30%, and meanwhile, a yarn internal structure with a non-coaxial special-shaped spiral structure is formed by optimizing a fiber transfer path. The breaking strength of the obtained woven yarn reaches 95% or above of that of conventional ring spun yarn of the same specification, the residual torque is reduced by 40%-60%, the method is suitable for weaving of warp yarn and weft yarn of high-density woven fabric, and the technical problems that low-twist yarn is prone to breaking and uneven in cloth cover in the weaving process can be solved.

The present application relates to cement-based building material technical field, especially to a kind of enhanced recycled aggregate concrete and preparation method thereof, the raw material of SAP particle is adjusted from the synthesis angle first in the present application, the surface group and pore structure of SAP particle are regulated, then the loading of nanometer silicon dioxide is carried out, and the enhanced SAP is prepared after silane coupling agent treatment, which has internal curing and hydration enhancement effect, and can be targeted to reinforce recycled aggregate concrete.

The invention discloses an ultraviolet curing organic silicon adhesive, a preparation method and application, and belongs to the technical field of high polymer materials. Wherein the adhesive comprises a sulfydryl organic silicon material, an acrylate organic silicon material, vinyl modified polyvinyl chloride and other components, and the preparation method comprises the following steps: S1, preparing the vinyl modified polyvinyl chloride; s2, preparation of sulfydryl organic silicon grafted vinyl modified polyvinyl chloride; and S3, preparing the ultraviolet light curing organic silicon adhesive. According to the prepared ultraviolet curing organic silicon adhesive, a sulfydryl organic silicon material is grafted to vinyl modified polyvinyl chloride through a thiol-ene reaction, and acrylate organic silicon is connected, so that the light curing speed, the high and low temperature resistance and the adhesion of the adhesive are remarkably improved. The invention solves the problems of low curing speed and poor adhesive property caused by poor compatibility of polyvinyl chloride and an organic silicon material, and has the potential of being applied to preparation of a pressure-sensitive adhesive, a sealing adhesive, a laminating adhesive and a pouring sealant.

This application discloses a U-phase nucleation-induced expansion agent, its preparation method, and its uses. The U-phase nucleation-induced expansion agent, by weight, comprises the following components: 20-50 parts aluminum-containing raw material; 5-40 parts calcium-containing raw material; 5-25 parts sulfate; 80-120 parts pH adjuster; and 0.5-2 parts auxiliary regulator. The aluminum-containing raw material, calcium-containing raw material, and sulfate are the raw materials for forming the U-phase structure. The pH adjuster provides a strongly alkaline environment to promote the dissolution of the raw materials into active substances. The auxiliary regulator enables the active substances to complete nucleation, growth, and stacking, thereby achieving the controllable generation of the U-phase structure. This application utilizes the in-situ generation of more U-phase crystal products based on induction, thereby reducing the proportion of gel phase products in geopolymers to decrease shrinkage, while simultaneously utilizing the water-absorbing and swelling properties of the U-phase to further inhibit shrinkage.

The application discloses a kind of based on aeolian genesis silt's anti-seepage material and preparation method thereof, belong to the field of water conservancy and hydropower engineering.It mainly includes the following weight parts of raw materials: aeolian genesis silt 48~54, gneiss aggregate 40~45 and modified bentonite 6~10.The anti-seepage material based on aeolian genesis silt of the embodiment of the application, gneiss aggregate, as the gravel component of anti-seepage material, is the support skeleton of anti-seepage material, and the particle strength is high, to increase the shear strength and deformation modulus, reduce shrinkage;Using modified bentonite, modified bentonite has stronger adsorption performance and bonding capacity, thereby improving the anti-seepage performance of anti-seepage material.The anti-seepage material based on aeolian genesis silt of the application has excellent anti-seepage effect and high mechanical strength.

The invention relates to sprayed concrete and a preparation method thereof, and relates to the technical field of concrete.The sprayed concrete is prepared from, by weight, 365-410 parts of cement, 790-830 parts of fine aggregate, 710-760 parts of coarse aggregate, 70-100 parts of fly ash, 75-95 parts of modified yellow phosphorus slag, 12-16 parts of accelerator, 4.5-7 parts of water reducer, 3-6.5 parts of natural plant admixture and 155-175 parts of water; the natural plant additive is prepared from beet root tubers and gelidium amansii in a weight ratio of (1-2): (5-9). On the basis of an existing shotcrete batching system, the natural plant admixture and the modified yellow phosphorus slag are introduced, all the components have a synergistic effect, the construction requirements for the initial strength and the later strength of the shotcrete are met, the rebound rate of the shotcrete is remarkably reduced, and the shotcrete has a good application prospect. The method can be widely applied to construction of various supporting projects such as tunnels and roadways.

This utility model discloses a comfortable cotton-Tencel denim fabric, belonging to the textile field. It comprises interwoven weft yarns and pure cotton warp yarns. The weft yarns consist of two systems: honeycomb polyester weft yarn and a second weft yarn. The second weft yarn includes parallel pure cotton weft yarns and Tencel weft yarns. The pure cotton warp yarns and honeycomb polyester weft yarns interweave to form the upper layer, and the pure cotton warp yarns and the second weft yarns interweave to form the lower layer. The number of warp stitches on the upper layer's fabric face is greater than the number of weft stitches. This fabric allows cotton and Tencel fibers to directly contact the skin, providing excellent moisture absorption and skin-friendliness. The honeycomb polyester weft yarns are mostly located between the upper pure cotton warp yarns and the lower layer, thus quickly transferring moisture absorbed by the lower layer to the upper pure cotton warp yarns. Combined with the lower layer's weave, this allows for rapid absorption of moisture from the skin, which is then transferred to the fabric face and spread out, accelerating moisture evaporation and reducing sweat accumulation on the fabric. Simultaneously, the fabric exhibits low shrinkage and good dimensional stability.

The utility model relates to a box foot with hook. Mainly solved the existing box foot with hook injection moulding cooling process in the hook part shrinkage is bigger, the problem of serious warping deformation. Including box foot body (1), the box foot body (1) is integral type structure, the box foot body (1) of valve body (1) one side is equipped with hook (2), its characterized in that: the outer surface of hook (2) is equipped with recess (3). The utility model discloses the recess that set up in the hook outer surface has effectively reduced the wall thickness of hook, and the hook part shrinkage is smaller in the cooling process, and the warping deformation of hook part is smaller, and the product surface is relatively flat, improves product quality. Meanwhile has adopted big circular arc angle transition in the corner, has prevented the security hidden danger.

The invention discloses ceramic tile renovation interface putty and a preparation method thereof, and belongs to the technical field of building decoration materials. The putty is of a two-component system, the powder component A adopts coarse, medium and fine three-level grain composition design and is added with a composite functional aid, the glue component B takes acrylic acid modified silicon resin emulsion as a main body, and the two components are mixed according to the proportion of (1-2): 1. During preparation, the stable performance of the product is ensured through a step-by-step premixing process of the powder components, a low-temperature stirring process of the glue components and a secondary stirring process before construction. Through the synergistic effect of multiple components, the problems that an existing tile renovating material is poor in adhesive force, weak in water resistance, prone to hollowing and falling and the like are effectively solved, the tile renovating material has the advantages of being high in bonding strength, low in drying shrinkage rate, good in water resistance stability, convenient to construct and the like, can be directly constructed on the surface of an old tile, does not need to remove an old layer, and is high in renovating efficiency and high in practicability.

The application discloses a kind of nano-silica modified epoxy vegetable oil acrylate coatings.The application uses in-situ sol-gel method to prepare modified nano-silica, which is grafted under reflux in nitrogen protection, and then compounded with epoxy vegetable oil acrylate and other components to obtain the coating.The acrylate coating obtained by the application solves the problems of traditional bio-based coating filler, such as easy agglomeration, low hardness, poor wear resistance, etc., and has the characteristics of uniform dispersion, full curing, excellent adhesion and water resistance, green low VOC, etc.The process is simple and easy to industrialize, and can be used for UV curing protective coating of wood, plastic, paper and other substrates.

The application relates to the technical field of molecular sieves, and particularly discloses a molecular sieve for a natural gas drying device and a preparation process thereof. The raw material of the molecular sieve comprises the following components in parts by weight: 50.0-50.8 parts of molecular sieve raw powder, 20.0-20.4 parts of attapulgite, 12-16 parts of phosphorous slag, 4.9-5.1 parts of a binder, 1.4-1.6 parts of a first filling powder and 9.5-9.7 parts of a second filling powder; the first filling powder comprises halloysite nanotubes. The application reduces the shrinkage deformation of the prefabricated pellets in the high-temperature activation process, improves the anti-pulverization performance of the molecular sieve, reduces the influence of the pulverization phenomenon on the service life of the molecular sieve, and is beneficial to the long-term use of the molecular sieve in the natural gas drying device.

The invention relates to the technical field of building materials, in particular to a coupling coarse aggregate and a preparation method and application thereof.The coupling coarse aggregate takes waste tempered glass particles with the particle size of 5-40 mm as an inner core, the inner core is coated with a red mud-based cementing material layer with the thickness of 1-5 mm, and the coating layer is composed of, by weight, 70-80 parts of red mud, 10-15 parts of fly ash and 5-20 parts of cement. The preparation method comprises the following steps: crushing and screening waste toughened glass, preparing red-mud-based gel slurry, coating the surfaces of glass particles with the red-mud-based gel slurry in a dip-coating or roll-coating manner, and carrying out standard curing for 28 days to obtain the coupling coarse aggregate. The aggregate can replace natural coarse aggregate to prepare large-dosage red mud-based concrete, wherein a cementing material comprises red mud, mineral powder, ardealite and cement. According to the invention, the alkali-silicon reaction is effectively blocked through the core-shell structure, and the aggregate-matrix interface performance is improved, so that the concrete has high compressive strength, excellent durability and low expansion rate, meanwhile, the synergistic resource utilization of bulk solid wastes of the red mud and the waste toughened glass is realized, and the concrete has remarkable environmental protection and economic benefits.

The utility model relates to the technical field of car body structure discloses a kind of anti-lost screw cover plates, including cover plate body, the one end of cover plate body is provided with clamping part, the one end of cover plate body is connected with the clamping part opposite and is connected with connecting part, connecting part is connected with elastic compression frame, elastic compression frame is connected by four side frames of parallelogram shape head-to-tail, the outside of elastic compression frame is fixedly connected with anti-retraction part.The utility model patent solves the problem that screw cover plate in the prior art is easily lost during transportation or product delivery.

This invention discloses a seepage-proof, low-shrinkage mortar and its preparation method. The seepage-proof, low-shrinkage mortar comprises, by weight, 45-60 parts of seepage-proof, low-shrinkage cementitious material; 130-180 parts of manufactured sand; 1-3 parts of water-repellent agent; and 40-60 parts of water. This invention uses green inorganic materials for preparation, exhibiting a micro-expansion effect, effectively avoiding the problem of large material shrinkage, while also improving the seepage resistance of the cementitious material, thus possessing the advantages of seepage prevention and low shrinkage.