62results about How to "Reduce thermal expansion and contraction" patented technology

The invention relates to a liquid silicon rubber composition which comprises the following components in parts by mass: 100 parts of polydimethylsiloxane with vinyl as an end group, 1-400 parts of inorganic reinforcing agent, 1-20 parts of low-viscosity polydimethylsiloxane with a vinyl-containing side group, 0.01-10 parts of cross-linking agent, 1-30 parts of polydimethylsiloxane with hydroxyl as an end group, and a platinum catalyst capable of curing the liquid silicon rubber composition. The invention further relates to a preparation method of the liquid silicon rubber composition. The liquid silicon rubber composition has low viscosity and good fluidity before being cured and is applicable to injection molding; and the composition has excellent resilience and low compression deformation ratio after being cured. The liquid silicon rubber composition can be applied to an elastomer, a pressure roll and an image heating and fixing device in a copier and a laser printer as well as certain silicon rubber products in need of the properties.

The invention discloses a novel thermal insulation material, and the composition comprises expanded perlite, cement, gypsum powder, fibers, redispersible rubber powder, casein glue, and the like. The thermal insulation material has the advantages of high strength, aging resistance, excellent thermal insulation effect, energy conservation, environmental protection, fire protection, sound insulation, low cost, convenient use, and the like. The novel thermal insulation material can be directly applied on buildings, containers, pipelines, reactors, household appliances and the like through a plurality of construction methods, thereby achieving the effects of thermal insulation and energy conservation.

The invention discloses an ultra-high-performance electronic glass fiber cloth production process which specifically includes the steps: A, slightly splitting electronic glass fiber cloth; B, drying the slightly split electronic glass fiber cloth; C, deeply splitting the dried electronic glass fiber cloth; and D, drying the deeply split electronic glass fiber cloth so that ultra-high-performance electronic glass fiber cloth is obtained. During slight splitting, cloth surfaces are humidified by a water-washing oscillating trough, so that warp and weft yarns are bulked, and fibers are loosened; and during deep splitting, purified water is sprayed from holes of nozzles to be directly jetted to the cloth surfaces, the front and the back of the glass fiber cloth are sprayed by water columns, the warp and weft yarns are broken apart after the cloth surfaces are subjected to impact pressure of the purified water columns, the compactness of the glass fiber cloth is greatly reduced, and gaps among the warp and weft yarns are mostly filled by loose single fibers to be smaller, so that the surfaces of the glass fiber cloth become dense and uniform, and the surfaces of the glass fiber cloth are smoother after splitting.

The invention discloses a steam oxidation well furnace which comprises a furnace shell, a furnace cover, a furnace tank and a heating mechanism, wherein the furnace tank is arranged in the furnace shell; the heating mechanism is used for heating work pieces in the furnace tank; the bottom part of the furnace shell is provided with a steam preheating mechanism which is connected with an external steam source; and the steam preheating mechanism is communicated with the bottom part of the furnace tank through the steam diffusion structure. An individual steam preheating mechanism is added below the furnace tank, steam enters the furnace tank after the steam is heated by the steam preheating mechanism and is diffused uniformly by the steam diffusion structure, the temperature vibration in the furnace tank is reduced greatly, the expansion and contraction phenomenon in the furnace body is reduced, the welding point of the steam pipeline is difficult to drop off, and the steam pipeline is difficult to crack; and simultaneously the steam can be fused with metal work pieces more uniformly, the oxidation effect is improved obviously, the density of oxidizing materials on the surfaces of the metal work pieces is better, and the content of ferroferric oxide can reach more than 90%.

The invention relates to a water-based alkali-resistant seal primer which is composed of the following components in parts by weight: 300 parts of water, 3-5 parts of dispersing agent, 2-3 parts of wetting agent, 1-2 parts of multifunctional assistant, 50-70 parts of talcum powder, 180-200 parts of heavy calcium carbonate powder, 100-120 parts of emulsion for epoxy alkali-resistant primers, 200-250 parts of emulsion for waterproof paints, 1-3 parts of bactericide, 30-50 parts of titanium white, 20-30 parts of film-forming assistant, 1-2 parts of defoaming agent, 2-3 parts of thickener, 0.5-1 part of leveling agent and 20-30 parts of antifreezing agent. The water-based alkali-resistant seal primer has the advantages of favorable water resistance, favorable sealability, favorable alkali resistance, favorable antifreezing property, long service life and the like, and is harmless to the environment and human body.

The invention provides a formula and a preparation method of fire-proof, flame-retardant, ultra-light and high-strength paper pulp foam. The formula comprises the following components in part by weight: 100 parts of natural wood fiber raw material, 0.5-10 parts of fire-proof cross-linking aid, 1-20 parts of inorganic filler, 0-20 parts of chitosan, 0.5-10 parts of foaming agent and a plurality ofparts of water, wherein the natural wood fiber raw material in the water is 0.5-5 wt%. The preparation method comprises the following steps: adding the mechanically-crushed natural wood fiber raw material into a fire-proof cross-linking aid solution and performing cross-linking reaction under heating and stirring conditions; continuously adding the inorganic filler and an appropriate amount of chitosan and continuously stirring till the reaction ends; then adding the foaming agent, mechanically stirring and foaming; removing excessive moisture and foam, drying and forming to obtain the paper pulp foam. By utilizing aid compounding and beneficial interaction among the different components, the prepared paper pulp foam is excellent in performance and has wide industrial prospect and expectedeconomic benefit.

The invention discloses a rice processing technology. The technology comprises the steps of dust removal, dehumidification, shell removal, soaking, drying, wetting, rice grinding and polishing; according to the rice processing technology, soaking treatment is performed by adopting tea water, the obtained rice looks, smells and tastes good, meanwhile, due to the fact that tea water contains abundant tea polyphenol, the tenacity of blood vessels can be enhanced, serum cholesterol can be lowered, atherosclerosis is restrained, the effect of preventing heart cerebrovascular diseases is achieved, tea water contains abundant tannin, the tannin has the effect of restraining generation of lipid peroxidase, and therefore strokes can be effectively prevented, and the good healthcare effect is achieved; a tea water mixing solution soaked with pepper powder is adopted for performing spray wetting, and therefore the surface of the rice is stained with the special flavor of pepper; due to the fact that the pepper is a natural antioxidant, the special flavor has the effect of expelling parasite, rice hemiparasite can be effectively avoided, and the storage life of the rice is prolonged.

The invention relates to an automatic cleaning device for the surface of a disc type solar condenser. The automatic cleaning device is provided with a motor (1), and is characterized in that an input shaft (2), a first gear (3), a second gear (4), an output shaft (5), a travel switch (7), a sliding groove (9) and a temperature sensor (10) are all arranged on a condenser (6); a cleaning brush (8) is formed by two cleaning brushes which are arranged in an angle; one end of the cleaning brush (8) is connected with the output shaft (5) of a rotating center, and the other end of the cleaning brush (8) is connected with the sliding groove (9); the cleaning brush (8) is driven to make intermittent back and forth movement on the surface of the condenser (6) along the sliding groove (9) by a transmission mechanism driven by the motor (1).

The invention discloses a basalt fiber composite novel wall material and a preparation method thereof, wherein the basalt fiber composite novel wall material is prepared from the following raw materials by weight: 0.6-0.8% of basalt fiber yarns, 0.3-0.7% of basalt fiber grid cloth, 24-25% of fast hardening sulphoaluminate cement, 40-45% of river sand, 1-3% of screw thread steel, 5-7% of reinforcing steel bars, 2-5% of channel steel, 0.3-0.4% of flame-retardant foam, 13-15% of water, 0.24-0.3% of expanded perlite, 2.9-3.2% of an adhesive, 0.12-0.15% of an early strength agent or a retarder, 0.6-0.8% of a styrene-acrylic emulsion, 0.24-0.26% of ferrous sulfate, 0.49-0.51% of calcium and magnesium powder, and 0.98-1% of a concrete surface reinforcing agent. According to the invention, the wall material prepared from the components according to the specific ratio according to the architectural conventional method has characteristics of uniform thermal expansion and cold contraction, goodtoughness and breakage resistance, has weak alkality so as not to easily corrode iron, aluminum and other metal materials, further has advantages of light weight, environmental protection, high strength, good toughness and low energy consumption, can be freely modeled according to molds, and is suitable for popularization in the building material field.

The invention discloses a two-component polymer ceramic tile adhesive which is prepared from two groups of mixtures, wherein an A group of mixture comprises hydroxypropyl methylcellulose, calcium formate and epoxy resin; a B group of mixture comprises an acrylate copolymer, benzene rubber powder and epoxy resin; the A group of mixture is prepared from the following components in parts by weight: 250 to 450 parts of cement, 35 to 55 parts of gravel, 5 to 30 parts of redispersible latex powder, 3 to 10 parts of hydroxypropyl methylcellulose, 4 to 10 parts of calcium formate, 10 to 20 parts of epoxy resin, 40 to 50 parts of water, 40 to 60 parts of an emulsion and 5 to 20 parts of cellulose. The invention also discloses a preparation method of the two-component polymer ceramic tile adhesive.According to the preparation method, epoxy resin is adopted to weaken the thermal expansion and cold contraction of the adhesive, so that the tensile cohesiveness of the adhesive is increased, and ceramic tiles are prevented from falling off; gravel is adopted, so that the mechanical occlusion effect between gravels is greater, the bonding strength is increased; and meanwhile, silica fume is doped, the interface compactness is improved, and the interface bonding strength is remarkably improved.

The present invention relates to the connector field, especially to a printed board and radio frequency contact connection structure, a connector, a contact and a printed board. The printed board and radio frequency contact connection structure comprises a printed board, the printed board comprises a body and a signal conducting layer arranged in the body, a radio frequency contact is fixed installed at the front side of the body, the radio frequency contact comprise an inner conductor extending along the front and back direction and an outer conductor sleeved at the outer portion of the inner conductor, the body is provided with a signal post electrically connected with the signal conducting layer, and the rear end of the inner conductor is welded and fixed with the signal post. The inner conductor of the radio frequency contact in the printed board and radio frequency contact connection structure is directly welded and fixed on the signal post of the body of the printer board to ensure the reliable electrical connection between the inner conductor and the signal post, improve the reliability of the electrical connection of the inner conductor and the printed board and solve the problem that the reliability of electrical connection between the inner conductor of the current printed board and radio frequency contact connection structure and the printed board is bad.

The invention relates to the technical field of wafer machining, and discloses a wafer chamfering process based on a wafer chamfering device. The wafer chamfering device comprises a rotating piece, the rotating piece is connected with a chamfering wheel, the chamfering wheel is provided with a chamfering groove, and the opening direction of the chamfering groove is perpendicular to the axial direction of the chamfering wheel; the process comprises the following steps that S1, wafers are fed into the chamfering groove; S2: the radial direction of the wafers is at an acute angle with the openingdirection of the chamfered groove; S3, the rotating piece is started to gradually increase the rotating speed of the chamfering wheel, and after the rotating speed reaches a set driving rotating speed, the rotating speed is no longer increased; S4, when the rotating speed of the chamfering wheel is gradually increased, the rotating speed of the wafers is gradually increased, and after the rotating speed reaches the set wafer rotating speed, the rotating speed is no longer increased; and S5, the wafers rotate the acute angle in a reverse mode, and the radial direction of the wafers is parallelto the opening direction of the chamfering groove; and when the chamfering is conducted, the contact area between the wafers and the inner wall of the chamfering groove is reduced, the volume of theparts affected by the temperature change of the wafers is reduced, and the chamfering effect of the edge of the wafers is improved.

The invention discloses a temperature controlled electric oven, which comprises an electric oven main body and a cooling water tank; the right side on a front panel of the electric oven main body is provided with a control device, a temperature sensor is further arranged on the left wall of the inner part; the temperature sensor is electrically connected with the control device through a lead, andthe outer surface of the electric oven main body is provided with a heat isolating plate; a radiating layer is arranged between the heat isolating plate and the inner wall of the electric oven; ta radiating hole is arranged in the middle of the outer wall of the electric oven main body, two baffles are arranged on the radiating hole; the position of the radiating hole corresponding to the inner wall of the electric oven main body is provided with a driving device, the left side of the inner wall of the front panel of the electric oven main body is further provided with a MCU micro-control unit, and electrically connected with the driving device and the temperature sensor; multiple groups of springs are arranged in the radiating layer and evenly distributed. The temperature controlled electric oven has the beneficial effects of fully improving the problem of easily scalding of oven surface, realizing intelligent cooling, reducing risk of thermal expansion and cold contraction, and prolonging the service life; besides, the safety is high.

The invention discloses an anti-deformation device of an electric oven. The anti-deformation device of the electric oven mainly comprises a heat-insulating plate (1) and an electric oven inner wall (7), and a cavity layer (8) between the heat-insulating plate and the electric oven inner wall. The heat-insulating plate (1) is placed at the outer side of the electric oven. The center position of theheat-insulating plate (1) is provided with a radiating hole (2). The radiating hole (2) is provided with two baffles (4). The baffles (4) are connected with the heat-insulating plate (1) through a hinge (3). The cavity layer (8) is internally provided with a plurality of groups of springs (6) and a cooling water pipe (5). The springs (6) are uniformly distributed in the cavity layer (8), and fixedly connected with the heat-insulating plate (1) and the electric oven inner wall (7). The cooling water pipe (5) is installed between two groups of the springs (6), and does not contact with the heat-insulating plate (1) and the electric oven inner wall (7). The beneficial effect of the anti-deformation device of the electric oven is that the thermal expansion and cold contraction danger of the electric oven cavity wall is reduced, the service life is prolonged, a problem that the scalding is easily caused by the high temperature of the surface of the oven is improved, and the safety is high.

The invention discloses a radar box body for a safe auxiliary driving system, and belongs to the technical field of vehicle auxiliary equipment. The radar box body comprises a box cover and a box body; a mounting plate is arranged at the top end of the box body; connecting holes are uniformly formed in the left side and the right side of the mounting plate; heat dissipation exhaust holes I are uniformly formed in the middle position of the mounting plate; a box cover is arranged at the top end of the mounting plate; water guide grooves are uniformly formed in the outer side of the box cover; apermanent magnet synchronous motor is fixedly arranged in the middle of the bottom end of the mounting plate; glass wool is adhered to the left and right sides of the inner cavity of the box body; heat dissipation exhaust holes II are uniformly formed in the middle of the bottom end of the inner cavity of the box body; and radiating fins are uniformly and fixedly arranged at the middle position of the bottom end of the box body. According to the radar box, the situations that the radar box body is deformed due to expansion and contraction caused by temperature change, and a radar in the box body is prone to being affected with damp due to the fact that water or fog exists outside the radar are reduced, working performance of the radar is guaranteed, and the service life of the box body and the service life of the radar are prolonged.