67results about How to "Reduced shrinkage deformation" patented technology

The invention discloses a manufacturing method of masks. The manufacturing method comprises the following steps: (1) measuring an environment temperature T1; (2) tensioning the two ends of a shielding mask, and fixing the shielding mask on a mask frame and calculating the deformation of the shielding mask; (3) fixing masks in the left region and the right region of the mask frame, respectively, wherein the edges of the masks are as long as the overlapping part of the shielding mask; calculating the deformation of the masks; (4) putting the mask frame on which the shielding mask and the masks are fixed into a heating room and heating to a temperature T2 for thermal expansion; (5) welding and fixing the overlapping regions of the masks and the shielding masks in an environment at the temperature T2; and (6) taking out the mask frame from the heating room and cooling to the temperature T1. By the manufacturing method dislcosed by the invention, the shrinking deformation problem due to tension can be effectively reduced and the quality of the mask is improved, and the method is capable of meeting the requirements of manufacturing the masks of high PPI display screen products.

The invention relates to a material which is developed with an aim at the facts that the prior concrete has the characteristics of low water binder ratio and great amount of external addition of minerals, the water contained in the prior concrete hardly satisfies the requirement on the full hydration of gel materials and the effect of external water supply for maintenance is not satisfactory. The aim of the invention is to provide an intelligent shrinkage reducing agent preparation process for concrete; as the concrete shrinkage reducing agent, the material can intelligently provide humidity in the concrete, and the addition of the material accounts for 0.03 to 0.05 wt percent with respect to the gel material in the concrete. The test result shows that the intelligent shrinkage reducing agent can keep the water in the concrete in a certain degree; the addition of the intelligent shrinkage reducing agent with an appropriate amount can remarkably reduce the shrinkage and deformation of the concrete so as to achieve the aim of improving the durability of the concrete.

The invention discloses a polypropylene wire material for 3D printing and a preparation method thereof. The polypropylene wire material is composed of co-polypropylene, low-melting-point homo-polypropylene, inorganic filler, thermoplastic elastomers, a plasticizer and a stabilizer. The polypropylene wire material is low in material crystallinity degree, shrinkage distortion and warping, has good 3D printing effects and printing accuracy, and can reduce cost to a large extent. The preparation method for the polypropylene wire material for 3D printing is simple in technology and lower in production equipment requirement, can achieve large-scale production and popularization, and has a wide market prospect.

The invention discloses a glued groove-and-tongue floor, which comprises a floor body, wherein the floor body is provided with a joint tongue and a joint groove. The glued groove-and-tongue floor is characterized in that: a pressure sensitive glue layer is coated on the joint tongue and/or the joint groove. The glued groove-and-tongue floor has the advantages that: 1, the pressure sensitive glue layer is pre-coated on the joint tongue and/or the joint groove, namely the tongued and grooved positions, of the floor so as to greatly improve a floor gluing mounting process and the mounting efficiency, save time, avoid the surface of the floor being polluted and achieve higher environmental friendliness; 2, adjacent floor blocks can be separated without any damage after being glued and spliced by pressure sensitive glue, so the floor is convenient to disassemble and rearrange after faults are produced in arrangement and pavement, and the after-service cost of the product is reduced; and 3, the adhesive power of the pressure sensitive glue can greatly strengthen an interlocking force between tongues and grooves of the floors and make securer and more stable the splicing of the floor, thereby greatly reducing the problem of contraction joint deformation of the paved floor as well as noises caused by friction between the tongues and grooves of the floors and greatly improving the mounting quality of the floor.

The invention discloses personalizedly customized reticular porous carbon and a preparation method thereof. The reticular porous carbon has a precise personalizedly customized shape and internal micro pores. The porosity of the reticular porous carbon is 70%-99.5%, the diameter of inscribed circles of all faces of micro polyhedrons forming the reticular porous carbon is 0.2-3 mm, and the diameter of inscribed circles of cross sections of polyhedron connecting rods is 0.02-1.5 mm. The preparation method comprises the following steps: designing a shape contour and an internal pore structure of a porous digital model; preparing a reticular porous carbon precursor by using a material-increasing preparation method; filling the interior of the porous carbon precursor with a burying sintering material; placing the porous carbon precursor filled with the burying sintering material in a 500-1000 DEG C vacuum or a protecting atmosphere, and carrying out pyrolysis; and finally, removing the burying sintering material, then carrying out 1100-3000 DEG C graphitization treatment to obtain the graphitized reticular porous carbon. The method overcomes the defects of distortion and shrinkage deformation of a porous polymer in a pyrolysis process, and makes up for the shortcomings that a traditional reticular porous carbon preparation method difficultly realizes precise control of a macroscopic shape and a micro pore structure.

The invention provides a folding mechanism, a folding screen and a mobile terminal. The folding mechanism comprises multiple folding sheets, several guide parts and several pairs of elastic telescopicassemblies, and a circle center shaft of each guide part is located in a corresponding area between the front faces of two corresponding folding sheets. According to the folding mechanism, by arranging the guide parts for guiding every two adjacent folding sheets to slide curvedly along an arc and forming sliding ways for the corresponding ends of the guide parts to be slidably inserted in the side faces of the folding sheets, the multiple folding sheets can be conveniently curved along the arc; by arranging the several pairs of elastic telescopic assemblies for elastically pushing every twoadjacent folding sheets to get away from each other, bending of the multiple folding sheets is facilitated; and as the bending axis of every two adjacent folding sheets is the circle center shaft of the corresponding guide part and the circle center shaft of each guide part is located in the corresponding area between the front faces of the two corresponding folding sheets, the bending axis of every two adjacent folding sheets is close to the corresponding position between the two front faces, and when the front faces of the folding sheets support the flexible screen, the stretching and retracting deformation of the flexible screen can be reduced to better protect the flexible screen.

Disclosed are a super-absorbent-resin-type self-maintenance material for concrete and a preparation method of the self-maintenance material. The method comprises: introducing a super-absorbent-resin-type functional component material for water maintenance into concrete, wherein the material includes deionized water, disodium ethylene diamine tetraacetate, triethanolamine, interpenetrating polymer networks, acrylic acid and a derivative thereof, acrylamide and a derivative thereof, a reducing agent, a cross-linking agent, and an initiator, and carrying out a constant-temperature polymerization reaction, standing, shearing, drying, and pulverizing to prepare the self-maintenance material. Disodium ethylene diamine tetraacetate, triethanolamine, and interpenetrating polymer networks which can highly absorb an alkaline ionic solution are introduced, so that the problem that a conventional super absorbent resin is poor in absorption of a cement hydrated solution is overcome. (Un-neutralized) acrylic acid and the derivative thereof are adopted, and the preparation method and device are simplified. The self-maintenance material has an absorption rate ratio of water to a concrete mixture centrifugate being 0.5-1.2, and a particle size of 0.1-50.0 mum. The risk that a self-maintenance material is liable to cause poor workability and lost mechanical properties of concrete is lowered.

The invention discloses modified repair mortar. The modified repair mortar is prepared by mixing sulphoaluminate cement, ordinary silicate cement, quartz sand, a complex early strength agent, a water-retaining agent, anti-crack fibers, a water reducing agent and water. According to the modified repair mortar, a sulphoaluminate cement and ordinary silicate cement mixed cementing material is adopted, the optimal mix and match proportion is selected, the early strength of the mortar is high, the setting time is proper, and construction is convenient. In addition, the complex early strength agent, the water-retaining agent, the water reducing agent and the like are added, and therefore better strength of the mortar in early stage and later stage is effectively guaranteed. The anti-crack fibers are added in the components, shrinkage deformation of the mortar is greatly reduced, when the mortar is under stress, the anti-crack fibers play an active prevention role in generation and development of cracks, the shrinkage deformation is obviously reduced, and cracks generated in the repair mortar setting and hardening processes and under stress are reduced.

The invention discloses lightweight plastering mortar, which is characterized in that the mortar is formed by mixing the following components in part by weight: 20 to 25 parts of common silicate cement, 2 to 4 parts of slaked lime, 5 to 10 parts of light aggregate, 20 to 30 parts of electromagnetic wave absorption master batch, 30 to 50 parts of heavy aggregate and 1.0 part of composite auxiliaryagent, wherein the light aggregate is an inorganic vitrified hollow micropore material with fineness of less than 100 meshes, and the heavy aggregate is common river sand. The construction method comprises the following steps of: diluting the lightweight plastering mortar by adding water in an amount which is 30 to 50 percent of the weight of the mortar, mechanically or manually stirring the mortar till the mortar is mixed uniformly, and mechanically coating the mortar or manually constructing the mortar when the mortar reaches the viscosity suitable for mechanical coating or manual construction. The lightweight plastering mortar with function of shielding and absorbing electromagnetic wave can shield and absorb the outdoor electromagnetic wave, absorb the indoor electromagnetic wave and reduce the diffuse reflection of the indoor electromagnetic wave, is light and energy-saving, reduces the consumption of unit area material and has low unit area manufacturing cost; and when used for a lightweight wall, the lightweight plastering mortar can prevent hollowing, cracking and dropping, is favorable for mechanized construction, and has simple process.

The invention discloses a method for preparing ceramic microspheres by adopting a direct titration molding technology. The method mainly comprises the following steps: weighing ceramic powder and a water solvent, carrying out ball milling on the ceramic powder and the water solvent to obtain ceramic slurry with a solid content of 75-85%, adding a curing agent into the ceramic slurry, and conducting uniform mixing, wherein forming of the ceramic slurry is carried out on dispensing machine system equipment; preparing a super-hydrophobic film on the surface of an inclined-plane track, controlling the ceramic slurry injected by a titration needle cylinder to form liquid drops with sizes of 0.1-1.5 mm, allowing the liquid drops to drop to the top end of the inclined-plane track, and enabling the liquid drops to freely roll to the bottom end from the top end of the inclined-plane track so as to complete curing to form a ball blank; and drying the ball blank for 5-10 hours at a temperature of 100-120 DEG C, conducting degreasing for 10-20 hours at a temperature of 550-600 DEG C, performing sintering at a temperature of 1400-1550 DEG C, and keeping the ball blank at the temperature for 2-5 hours to obtain the ceramic microspheres. The prepared ceramic microspheres are high in sphericity degree and uniform in internal structure, and have the advantages of being low in process cost, few in procedure, high in efficiency, easy to achieve automatic control and the like.

The invention belongs to the technical field of polymer materials, and particularly relates to a weatherproof glass fiber reinforced PA66 high-speed rail sleeve material and a preparation method thereof. The material comprises, by weight, the following components: 44.0-58.3% of PA66 resin, 5.0-10.0% of PA6T resin, 0.3-0.5% of antioxidant 1000, 0.3-0.5% of antioxidant 1098, 0.3-0.5% of lubricant, 5.0-10.0% of inorganic filler, 0.5-1% of toughening agent and 0.3-0.5% of weatherproof agent, 30-33% of glass fiber. The material has the advantages of low cost, high strength, strong toughness, fatigue resistance, stable size, good aging resistance, good weatherproof performance and the like, and can meet the high standard requirement of a high-speed rail sleeve.

The invention discloses a stainless steel seamless oil pipe for an automobile. A manufacturing method of the stainless steel seamless oil pipe for the automobile comprises the steps that PVC resin with the polymerization degree being about 2500 is selected, buna-N rubber is used as modified resin, a tricarboxymethyl propane triacrylate (TMPA) monomer is used as a cross-linking agent, an electronicbeam is adopted for carrying out irradiation modification on mixed rubber of the PVC resin and the buna-N rubber, and the outer surfaces of the two ends of a straight pipe are coated with the mixed rubber. The inner wall smoothness and inner structure of the steel pipe for the automobile are uniform, the internal smoothness problem is solved through the principle that the outer diameter is matched with the wall thickness, capillary cracks of the inner wall brought by original blank materials of the steel pipe are eliminated, steel pipe internal structure uniformity is achieved, the fine grainstructure is obtained, the outer surface of the straight pipe is evenly coated with the mixed rubber of the PVC resin and the NBR, the oil resistance of the TP304 stainless steel seamless steel pipeis improved, the shrinkage deformation rate is small, and long-term use is facilitated.

The invention discloses an anti-cracking surface-grinded brick and a preparation method thereof. The anti-cracking surface-grinded brick has a raw material formula which comprises the following raw materials in percentages by weight: 20% to 40% of plastic pug, 20% to 30% of full-body brick clinker particles with a particle size of 10 to 15 meshes, 10% to 15% of vitrified brick clinker particles with a particle size of 20 to 30 meshes, 20% to 35% of a feldspar solvent and 1% to 3% of an anti-cracking agent, wherein the anti-cracking agent has a formula composed of the following components in percentages by weight: 20% to 40% of a pure acrylic emulsion, 5% to 20% of alkyl ethenone modified cellulose, 1% to 5% of phosphate, 1% to 5% of polyvinyl alcohol, 10% to 15% of bentonite, 2% to 5% of apolyacrylic emulsion and 15% to 35% of water. According to the invention, on the premise of no damage to green-brick strength and sintering strength, the shrinkage deformability of a green brick is effectively reduced; the usage amount of the plastic pug is greatly reduced in the process of extrusion molding; the usage amount of large waste ceramic particles can be greatly improved; the strengthof the green brick is improved; a drying shrinkage rate and a sintering shrinkage rate are low; plasticity is strong; and drying cracks and sintering cracks are avoided from generation.

The invention discloses an IC card packaging device and method. The IC card packaging device comprises a packaging platform, hot pressing devices, cold pressing devices, negative pressure devices, a transmission device and power devices, wherein the hot pressing devices and the cold pressing devices are sequentially arranged in the IC card transmission direction, the hot pressing devices comprise hot pressing heads, and the hot pressing heads are internally provided with heating devices; the cold pressing devices comprise cold pressing heads, the packaging platform is provided with card grooves adapted to the size of an IC card, the bottom surface of each card groove is provided with adsorption holes, and the negative pressure devices are communicated with the adsorption holes. When the cold pressing heads conduct cold pressing on the IC cards in the card grooves, plastic card bases in the card grooves are absorbed by the adsorption holes through negative pressure, so that the lower surfaces of the plastic card bases in a softening state become regular and flat, and then the beautiful degree of the card surfaces is greatly improved.

Belonging to the technical field of macromolecular materials, the invention in particular relates to a weatherproof glass fiber reinforced PA66 common railway track gauge block material and a preparation method thereof. The weatherproof glass fiber reinforced PA66 common railway track gauge block material provided by the invention includes the following components by weight percentage: 39.0-52.8%of PA66 resin, 5.0-10.0% of PA6T resin, 0.6-1.0% of an antioxidant, 0.3-0.5% of a lubricant, 5.0-10.0% of inorganic filler, 1.0-2.0% of a toughening agent, 0.3-0.5% of a weathering agent, and 35-37% of glass fiber. The weatherproof glass fiber reinforced PA66 common railway track gauge block material provided by the invention has the characteristics of low cost and excellent comprehensive performance, and meets the high standard requirements of track gauge blocks. The weatherproof glass fiber reinforced PA66 common railway track gauge block material provided by the invention has low water absorption, good water resistance and excellent dimensional stability, and improves the product lifetime.

The invention relates to a rolled product processing apparatus. The processing apparatus comprises a roll needle and a shaping mechanism, wherein the shaping mechanism comprises a movable part, a first acting part and a second acting part, wherein the movable part is connected with at least one of the first acting part and the second acting part; the movable part has an effect of enabling the first acting part and the second acting part to generate a stretching stroke to be far from each other relatively; accommodating grooves used for accommodating the first acting part and the second acting part respectively are formed in the outer surface of the roll needle; in the stretching stroke, the first acting part and the second acting part can apply acting forces of opposite directions to the rolled product so as to stretch the rolled product; and at the starting end of the stretching stroke, the first acting part and the second acting part are both positioned in the corresponding accommodating grooves. By virtue of the scheme, shrinkage deformation amount of the rolled product to a hollow part of the rolled product is reduced, so that the processing quality of the rolled product, such as a wound cell, can be improved consequently.

The invention relates to a low-shrinkage shaping high-coaxiality cable cladding production line, and relates to the technical field of cable production. The production line comprises a feeding device, an extrusion molding device, a cooling device, a drying device, a driving device and a receiving device which are arranged in sequence, wherein a pre-shaping device is arranged between the extrusion molding device and the cooling device, the pre-shaping device comprises an L-shaped heating support, a guide plate and a redirecting shaft, the L-shaped heating support comprises a vertical section and a horizontal section which are connected, the vertical section is located below a discharging end of the extrusion molding device, and the horizontal section is located at a feeding end of the cooling device; one end of the guide plate is mounted on the inner side of the vertical section, and the other end of the guide plate extends towards the discharge end of the extrusion molding device; and the redirecting shaft is mounted on the L-shaped heating support and located at the right angle of the L-shaped heating support, and a gap is formed between the peripheral wall of the redirecting shaft and the L-shaped heating support. The production line has the advantages that uniform cladding of a cladding material in the circumferential direction of a cable is facilitated, and the shrinkage deformation is small, so that the coaxiality of the cable and a sheath is improved.