44results about How to "Does not affect durability" patented technology

The invention relates to a pressure-sensitive adhesive for a polaroid. The pressure-sensitive adhesive for the polaroid comprises 100 weight parts of crylic acid copolymer, 0.1 to 0.5 weight part of isocyanate-based crosslinking agent and 1 to 4 weight parts of hydrophobic ionic liquid, wherein the hydrophobic ionic liquid serves as an antistatic agent and has compatibility with the pressure-sensitive adhesive. The pressure-sensitive adhesive for the polaroid adopts the hydrophobic ionic liquid serves as the antistatic agent, and is optically transparent, durable and reliable.

The invention discloses a polycarboxylate cement grinding aid and a preparation method thereof. The preparation method comprises the following steps of: performing copolymerization on comonomers in aqueous solution in the presence of an initiator to obtain a polymer A, wherein the comonomers comprise ether monomers, amine monomers and carboxylic acid monomers; and adding a small amount of alcamines substance B into the polymer A to obtain the polycarboxylate cement grinding aid. The grinding aid has the advantages of obviously improving grinding efficiency and greatly improving cement strength, along with simple production method and environmental protection.

The invention relates to a method for quickly repairing cement concrete pavement. The method comprises the following steps of: (1) prefabricating a cement concrete plate; (2) clearing the original plate damaged by diseases; (3) processing the original base layer; (4) conveying and hoisting the plate; (5) leveling the plate; (6) grouting locally; and (7) processing joints. Through the invention, the road closing time is shortened, the centralized backfield maintenance of the cement concrete pavement plate is realized, and the restriction on vehicle passage caused by traditional several days of maintenance after cement concrete pouring is avoided; the cost is low, the prefabricated spliced pavement has long service life, and the cost of restricting the traffic passage for road repair and construction is reduced; the durability is good, and the cement concrete prefabricated member is proved with excellent durability in bridges and house buildings; and the influence of weather conditions is avoided since the prefabricated slab can be constructed in hostile environment without influencing the strength and durability of the pavement slab.

A wheel assembly with an in-wheel motor, which transmits rotational output of an output shaft of a motor to a wheel via a counter gear, is provided with an oil pump that is driven by rotational output of the counter gear and an oil flow path that leads oil from the oil pump to the motor.

The invention relates to a crystalline nucleus early-strength polycarboxylic acid water reducer and a preparation method thereof. The water reducer comprises the following components in percentage byweight: 10-20% of tricalcium silicate, 20-30% of carboxylic acid vinyl copolymer and 50-70% of deionized water. The preparation method comprises the following steps: adding tricalcium silicate, carboxylic acid vinyl copolymer and deionized water into a ball mill according to proportion, adding zirconia grinding balls, and performing ball milling to obtain the crystalline nucleus early-strength polycarboxylic acid water reducer with a median particle size of less than or equal to 500nm. The crystalline nucleus early-strength polycarboxylic acid water reducer provided by the invention integratesthe advantages of the water reducer and the early-strength agent, the main raw materials are tricalcium silicate and polycarboxylic acid water reducer, which will not cause strength decreasing in thelater stage, the water reducer is mixed into ordinary portland cement mortar according to the mixing amount of 1.0-2.0%, so that the water reduction rate can reach more than 30% and the 12h strengthincrease ratio can reach more than 250%. The preparation method is simple in process, easy to control the process parameters and easy to popularize.

The light fill body structure includes soil layers and foamed plastic block layers superposed alternately. In all the foamed plastic block layers, there are drilled soil column holes. There are also concrete layer over the top foamed plastic block layer, bottom crushed stone layer below the lowest foamed plastic block layer, and retaining wall to the sides of the fill body structure. The present invention is easy to construct, and has density lower than common soil, adjustable strength, light pressure to soil, and less deposit and side flow. The present invention makes it possible to refill soil vertically.

The invention discloses a manufacturing method of a sulphur resistant Velcro, including procedures as follows: the Velcro is put into a tincture machine to be cleaned, then the Velcro is bleached; and then the bleached Velcro is dehydrated by a hydroextractor, and is friezed by a friezing machine; then the bleached and friezed Velcro undergoes sulphur resistant treatment and gum with a gum machine, and finally is dried by baking. When the sulphur resistant Velcro manufactured by the method of the invention is used as a Velcro for products such as rubber products, the Velcro can not turn yellow, which is caused by the sulphur contained gas released during the processing process of the rubber products; therefore, the utility model has the characteristics of beautiful appearance and durable use.

The invention discloses a concrete glue reducing agent and belongs to the technical field of concrete admixtures. The concrete glue reducing agent is composed of the following components in percentageby weight: 20%-45% of organic amine, 15%-30% of low-molecular-weight polyethylene glycol, 0.01%-0.1% of a bubble adjusting component and the balance of water. The concrete glue reducing agent disclosed by the invention is non-toxic, simple in process, pollution-free, low in energy consumption and easy for industrial production; and the peaceability of concrete can be effectively improved, the slurry enrichment rate of cement-based slurry can be improved, the chemical reaction effect of a cement-based gel material in the concrete can be improved, and the cost of the concrete can be saved.

The present invention has: an inner cylinder (11) coupled to either one of a vibration generator and a vibration receiver; an outer cylinder (12) coupled to the other of the vibration generator and the vibration receiver; an intermediate cylinder (13) fitted on the inner circumferential surface of the outer cylinder (12); a main elastic body (14) for connecting the inner cylinder (11) and the intermediate cylinder (13); and stopper elastic bodies (15, 16) that are fixed to the intermediate cylinder (13) and that face the inner cylinder (11), there being interposed therebetween at least hollow sections (17, 18) formed in a direction orthogonal to the inner cylinder shaft direction so as to penetrate the main elastic body (14) in the inner cylinder shaft direction so that the stopper elastic bodies (15, 16) remain independent of the main elastic body (14). The stopper elastic bodies (15, 16) respectively have shaft direction stopper sections (15a, 16a) that protrude more in the inner cylinder shaft direction than the intermediate cylinder (13) and the outer cylinder (12).

The present invention provides a sprocket for a chain drive, capable of reducing vibrations and noises generated by engagement of chain and sprocket teeth by optimizing the tooth shape of the sprocket and tooth-shaped pitch angle, moreover, a standard chain is recessed from the sprocket smoothly, and the manufacture is easy and the vibration noise is reduced. The sprocket of a chain transmission has at least two different pitch angles arranged irregularly in the direction of the circumference of the sprocket's pitch circle. The diameter of the tooth gap bottom circle of the sprocket is larger than the diameter of tooth gap bottom circle of a standard sprocket having the same number of teeth. The teeth are integrally molded as a part of the sprocket by sintering.

The invention discloses a retarder for magnesium phosphate cement and a use method of the retarder. The retarder for the magnesium phosphate cement is prepared from the following materials in parts by weight: 23 to 48 parts of borax, 27 to 38 parts of magnesium sulfate heptahydrate and 1 to 6 parts of sodium acetate trihydrate. According to the invention, multiple retarding technologies are combined for use, a retarding effect is obvious, and the retarding effect is easy to adjust and controllable; the retarder is simple and practical, additional facility or measure cost is not increased, and construction management difficulty is not increased; safety and reliability are achieved, ions (such as chloride ions) harmful to a concrete matrix are not introduced, and structural strength and durability are not affected; and the retarder is high in applicability, can be introduced into magnesium phosphate cement paste, magnesium phosphate mortar and magnesium phosphate concrete for use, and is stable in effect.

The invention discloses a matte external wall coating and a preparation method thereof. The coating is prepared from, by mass percent p, 15-20% of water, 0.15% of wetting agent, 0.6-0.8% of organic dispersing agent, 0.4% of mold inhibitor, 0.2% of mineral oil deformer, 18-20% of titanium dioxide, 10-12% of kaolin, 1.5-2% of talcum powder, 6-10% of heavy calcium powder, 0.5-0.7% of hydroxyethyl cellulose, 0.1-0.2% of pH modifier, 0.2% of preservative, 30-40% of matte pure acrylic emulsion, 1-2% of coalescing agent, 1-2% of propylene glycol, 0.3-0.6% of alkali swelling thickening agent and 0.2-0.4% of associated thickener. Due to the fact that room-temperature self-crosslinking pure acrylic emulsion of a soft shell and hard core structure serves as matte pure acrylic emulsion, extinction can be achieved through the coalescing characteristic of the matte pure acrylic emulsion itself; thus, coating color and luster can be reduced by only adding normal pigment to the coating, the long-term durability of the coating is not influenced, and then the low color and luster and the long durability are achieved by the matte external wall coating.

The invention provides a supporting structure in which a shearing force pin shield tunnel duct piece opening is adopted and a construction method, and relates to the technical field of shield tunnels. The supporting structure comprises a shearing force pin, a front annular duct piece and a rear annular duct piece; the front annular duct piece and the rear annular duct piece are spliced to each other and are both internally provided with shearing force pins which are meshed with each other in a clamping mode. By improving a mold, the special duct pieces with prefabricated holes are produced, the shearing force pin is inserted in the duct piece assembly process, the shearing force generated in the duct piece opening after the duct pieces are penetrated is borne through the shearing pin, additional supporting is not needed, the durability of the duct pieces is not influenced, in-hole transportation during tunnel construction is also not influenced, and the structure safety is guaranteed.

The invention provides a two-part or multi-part double-layer type wearproof impact-resistant tube. The wearproof impact-resistant tube comprises an outer protection tube (1) and an inner wearproof combined tube (2). The inner wearproof combined tube (2) is embedded in the outer protection tube (1) and comprises two or more tube walls which are spliced together to form a tube body with an annular cross section. The wearproof impact-resistant tube can be straight or bent. When the wearproof impact-resistant tube is straight, the upper portion and the lower portion of the inner wearproof combined tube are made of different materials; when the wearproof impact-resistant tube is bent, the big bend portion and the small bend portion of the wearproof impact-resistant tube are made of different materials. In conclusion, the inner combined tube of the wearproof impact-resistant tube is divided into at least two portions, and at least two portions are made of different materials. The wearproof impact-resistant tube of the structure has the advantages that service life can be prolonged, abrasive resistance and impact resistance can be enhanced and overall weight of the tube can be reduced.

The invention relates to antibacterial cement concrete and a preparation method thereof. The antibacterial cement concrete is prepared from the following raw materials in parts by weight: 12-18 parts of cement, 0.6-1 part of metakaolin, 32-55 parts of quartz sand, 58-120 parts of coarse aggregate, 0.012-0.04 part of an antibacterial agent and 5.5-10.5 parts of deionized water. Nano photocatalytic material is doped into the cement concrete as an antibacterial agent, so that the durability of the cement concrete is not influenced, and an antibacterial effect can be achieved for a long time; artificial coarse aggregate is adopted to replace part of natural coarse aggregate, so that the light receiving area of the antibacterial agent in the cement concrete can be increased; in addition, an antibacterial agent is adopted to form a lubricating film on the surface of the coarse aggregate, so that the lubricating degree of the surface of the coarse aggregate is improved, and the fluidity of cement concrete and the material mixing uniformity are improved.

The invention relates to a prefabricated concrete pipe piece with an internal light filling body and a prefabricating method. The prefabricated concrete pipe piece with the internal light filling bodyand the prefabricating method are applied to underground engineering constructed by adopting a prefabricating assembling method. The prefabricated concrete pipe piece is characterized by comprising apipe piece framework, the light filling body arranged in the pipe piece framework and a pipe piece body formed by layering pouring of concrete; and the light filling body is arranged in the extendingdirection of the pipe piece framework and is fixed through a hook on the pipe piece framework. Compared with the prior art, the prefabricated concrete pipe piece with the internal light filling bodyand the prefabricating method have the beneficial effects that the weight of the pipe piece is reduced, the single piece size of the prefabricated pipe piece is increased under the condition that theself weight of the pipe piece is not increased, the pipe piece construction convenience is improved, the construction efficiency can be effectively improved, raw materials are saved, the constructioncost is saved, resource losses are reduced, green construction is achieved, and influences to the environment are reduced.

The invention provides a two-layer or multi-layer wear-resistant and impact-resistant tube, the wear-resistant and impact-resistant tube includes: an outer layer protection tube (1) and an inner layer wear-resistant composite tube (2), and the inner layer is resistant to The grinding combined pipe (2) is nested in the outer protective pipe (1), and the inner wear-resistant combined pipe (2) is composed of two or more pieces of pipe walls, and the two or more pieces of pipe walls Spliced ​​together to form a tubular body with a ring-shaped cross section. The wear-resistant and impact-resistant pipe of the present invention can be a straight pipe or a bent pipe. In the case of straight pipes, the upper and lower parts of the inner wear-resistant composite pipe adopt heterogeneous structures; in the case of curved pipes, the large and small bends of the curved pipes adopt heterogeneous structures. In a word, the inner composite pipe of the wear-resistant and impact-resistant pipe of the present invention is divided into at least two parts, and at least the two parts are heterogeneous. Adopting the structure of the pipe body of the present invention can prolong its service life, enhance wear resistance and impact resistance, and reduce the total weight of the pipe body.

The invention relates to a precast pipe ring filled with light filler concrete and a precasting method; and the precast pipe ring is applied to underground engineering constructed by a precasting assembly method. The precast pipe ring comprises a pipe ring skeleton, a light filler arranged in the pipe ring skeleton, and a pipe ring main body molded by casting in a layering mode; the pipe ring skeleton comprises a skeleton main body consisting of multiple annular main ribs, and multiple stirrups for binding the skeleton main body; and the light filler is arranged in an annular cavity surroundedby the skeleton main body and the stirrups, and is fixed on the main ribs through hanging hooks. Compared with the prior art, the precast pipe ring has such advantages as reduction of self weight ofthe pipe ring, increment of the size of the precast pipe ring, improvement of the construction efficiency and saving of raw materials.

A porous water permeable brick having a purifying function and a preparing method thereof are disclosed. The water permeable brick includes, by weight, 40-60 parts of waste glass, 40-60 parts of fly ash, 20-30 parts of cement, 5-10 parts of montmorillonite, 5-10 parts of sisal hemp fibers, 10-15 parts of gypsum, 0.5-1 part of sodium lignosulfonate, 0.5-1 part of triterpenoid saponin, 0-0.5 part ofa microbial liquid, 1-5 parts of aggregate, and 5-10 parts of a binder. Reduction treatment of solid waste and utilization of resources are combined, consumption of traditional building materials with high energy consumption and high emission is reduced, and the brick has better environmental protection benefits and economic benefits.

The invention relates to the technical field of tunnel underground engineering, in particular to a plugging and draining combined treatment method for water leakage at a tunnel secondary lining construction joint. According to the plugging and draining combined treatment method, water plugging is conducted through anchor bolts and a rubber waterstop, then, natural draining is conducted through a draining guiding channel and draining guiding pipes, and the current structure of a tunnel secondary lining is not changed, so that destructiveness is less, lining cracking is effectively avoided, andtunnel safety and use are not affected; and the construction steps are simple, operability is high, a plugging and draining combined system is formed, natural draining is achieved, and economic benefits and social benefits are significant.

The invention discloses a later-period obviously-enhanced cement grinding aid and a preparation method thereof, belonging to the field of cement preparation. The grinding aid comprises the following components in percentage by mass: 10-40% of alkylol amine composition, 5-10% of anhydrous sodium sulfate, 1-3% of acetic acid, 10-30% of sodium gluconate, 5-20% of glycerol, 5-20% of molasses and the balance of water. The preparation method comprises the following steps: proportionally mixing the alkylol amine composition, anhydrous sodium sulfate, acetic acid, sodium gluconate, glycerol, molasses and water, and sufficiently stirring at normal temperature under atmospheric pressure. The cement grinding aid is suitable for Portland cement, composite cement, slag cement and various other cement species, and is especially suitable for cement with insufficient later strength or heavily-doped limestone cement; and the cement grinding aid can obviously enhance the cement grinding efficiency, lower the energy consumption, effectively enhance the 3-day and 28-day compression strength of cement and especially enhance the 28-day compression strength by 5-10 MPa.

The invention discloses a preparation method of a polycarboxylate water reducer for concrete prefabricated components, which comprises the following steps: mixing unsaturated polyoxyethylene ether macromonomers with deionized water, stirring evenly, adding an initiator, and continuing Stir; mix unsaturated carboxylic acid, chain transfer agent, monoethanolamine fumarate, reducing agent and deionized water, and stir evenly to prepare a mixed solution, gradually add the mixed solution to the above steps, and the dropwise addition is completed Finally, react for 2 to 4 hours, then add water to adjust the solid content of the system to obtain the mother liquor of polycarboxylate superplasticizer; dilute the mother liquor of polycarboxylate water reducer with water to a mass concentration of 20%, and then mix it with melamine and antifoaming agent are compounded to obtain a polycarboxylate water reducer for concrete prefabricated components. The water-reducing agent has simple preparation process, high water-reducing rate and excellent slump-preserving performance, can greatly increase the early strength and later strength of concrete, and can improve the surface smoothness of concrete products.

The invention discloses a preparation method of an early-strength polycarboxylate water reducer, comprising the following steps: (1) mixing polyether monomers and deionized water, stirring evenly, heating to 30°C, and then adding an initiator , continue to stir; (2) mix alcohol amine fumarate, acrylic acid, chain transfer agent, reducing agent, and deionized water, stir evenly, make a mixed solution, and add the mixed solution dropwise to step (1) (3) After the dropwise addition is completed, the reaction is carried out at 30°C for 2 to 4 hours, and then water is added to adjust the solid content of the system to obtain an early-strength polycarboxylate superplasticizer. The water-reducing agent obtained according to the preparation method disclosed in the present invention has a high water-reducing rate, good slump retention, can greatly improve the early strength, and has a relatively high later strength, and can be applied to pipe piles and prefabricated components that need to improve the early strength and other concrete products.

The invention discloses a preservative special for pozzuolana concrete. The preservative is prepared from silica fume, coal ash, sodium carboxymethylcellulose, a water reducer, latex powder, polyvinyl alcohol and triethanolamine. The preservative is particularly prepared from the following raw materials in parts by weight: 90-110 parts of silica fume, 5-20 parts of coal ash, 0.6-1.0 part of sodium carboxymethylcellulose, 1.0-2.0 parts of the water reducer, 1.0-2.0 parts of redispersible latex powder, 1.0-2.0 parts of solid polyvinyl alcohol and 0.1-0.5 part of solid triethanolamine; and 10%-20% of the preservative is mixed into mortar or concrete according to the weight of pozzuolana. Compared with the prior art, the preservative has the advantages that a certain amount of triisopropanolamine is doped as a concrete early strength agent, compared with sulfate and chlorine salt early strength agents, triisopropanolamine has the advantages that triisopropanolamine can be well fit with additives and has stable early strength, and the setting time and the durability are not influenced, so that the early strength of the pozzuolana concrete can be effectively improved, and the durability of the concrete can be improved.

The invention discloses a tire tread pattern structure of an all-terrain vehicle pneumatic tire. A tire tread comprises a left circumferential bar-shaped pattern column and a right circumferential pattern column which are symmetrically arranged along a central plane of the tire and are respectively formed by discontinuous left pattern blocks and discontinuous right pattern blocks in circumferential arrangement, and the left pattern blocks and the right pattern blocks are arranged in a staggered manner, wherein distances from the left pattern blocks and the right pattern blocks to the central plane of the tire are 7%~15% of the width of a tire section; the ground surfaces of the left pattern blocks and the right pattern blocks respectively consist of constant altitude parts positioned at a first ground end, and convergent parts which are positioned at later ground ends and are formed by contracting the constant altitude parts to the bottoms of pattern grooves; at the same time, concave arrangement is formed in the side walls of the first ground ends. Through the arrangement, the tire last is not influenced, and at the same time, the control performance of the tire on the sandy land can also be improved.

The invention discloses an embedded device for electrochemically detecting or repairing reinforcing bars in concrete. The embedded device comprises a joint, a positioner, a clamp and a conductive rod, wherein the joint comprises an outer sleeve and a conductive block; the outer sleeve is fixed on the positioner; the positioner is fixedly connected with the clamp; the conductive block is arranged in the outer sleeve and is electrically connected with the conductive rod and the clamp. The embedded device is simple in structure and convenient to install; after the device is installed, during the service of a structure, the conductive rod is inserted to enable the structure to be electrically communicated with the reinforcing bars; by virtue of electrochemical detection equipment, the reinforcing bars in the concrete can be electrochemically tested or dechlorinated and repaired by using various electrochemical testing methods, rich electrochemical parameters are obtained, and a corrosion state of the reinforcing bars is accurately mastered; the whole operation process is simple and quick, a concrete protection layer does not need to be broken in advance, the later-stage detection cost of the structure is saved, and the durability of the reinforcing bars is not influenced.

The invention relates to the technical field of preparation of polycarboxylate water reducers, in particular to a method for preparing an anti-freeze type high-performance polycarboxylate water reducer by utilizing an amino resin waste liquid. The method comprises the following steps: firstly taking methyl allyl polyoxyethylene ether, methacryloxy ethyl trimethylammonium chloride, maleic anhydride, hydrogen peroxide and a proper amount of deionized water as base materials to put in a reaction kettle, stirring till complete dissolution and then increasing the temperature; after the base materials are dissolved, simultaneously dropwise adding a solution A and a solution B and continuously performing stirring reaction after the end of dropwise adding; then regulating a pH value of a mixed solution to obtain a polycarboxylate water reducer and compounding with the amino resin waste liquid in proportion to prepare. The method provided by the invention has the benefits that as methyl propylene oxiranyl trimethyl ammonium chloride as a cationic functional monomer is introduced, a certain complex can be formed, so that the compactness of a structure self can be improved; the added amino resin waste liquid containing methanol can prevent concrete from freezing, so that the compressive strength, the compactness and the durability of the concrete are not affected.