35results about How to "Reduced linear shrinkage" patented technology

The invention discloses a two-component addition type room temperature vulcanized silicone rubber for manufacturing a handprint mold and a footprint mold, which comprises a basic component and a catalyst component, wherein the volume ratio of the basic component to the catalyst component is 1-3:1; the basic component comprises the following raw materials: 40-80% of vinyl silicone oil, 0.5-10% of methyl hydrogen silicone fluid of cross-linking agent, 0.01-0.5% of inhibitor, 3-15% of releasing agent, 1-10% of plasticizer and 10-60% packing; and the catalyst component comprises the following raw materials: 40-80% of vinyl silicone oil, 3-15% of methyl vinyl siloxane coordination platinum complex, 3-15% of releasing agent, 1-10% of plasticizer and 10-60% of packing. The invention has convenience and safety.

The invention discloses an organosilicon material. The organosilicon material comprises: a component A comprising, by weight, 80-200 parts of organopolysiloxane, 20-60 parts of a reinforcing filler, 0-20 parts of silicon resin, 50-80 parts of a heat conduction filler, 2-20 parts of a structurized control agent, and 0.05-0.8 parts of a reaction catalyst; and a component B comprising, by weight, 80-200 parts of organopolysiloxane, 0.5-10 parts of organic hydrogen-containing polysiloxane, 20-60 parts of the reinforcing filler, 0-20 parts of silicon resin, 50-80 parts of the heat conduction filler, 2-20 parts of the structurized control agent, and 0.05-0.4 parts of a reaction inhibitor, wherein a weight ratio of the component A to the component B is 1:1. The invention also discloses a preparation method of the organosilicon material, and a method for applying the organosilicon material in 3D printing. The organosilicon material has the advantages of superior performances, safety and non-toxicity; the preparation method of the organosilicon material is simple and is easy to carry out; and application of the organosilicon material in 3D printing is maneuverable.

The invention discloses a precisely cast low-temperature modulated wax and a preparation method thereof. The precisely cast low-temperature modulated wax comprises the following raw materials in parts by weight: 44-46 parts of microcrystalline wax, 2.5-3.5 parts of lignite wax, 34-36 parts of rosin resin, 3.5-4.5 parts of an ethylene-vinyl acetate copolymer and 12-14 parts of pure monomer resin. The wax disclosed by the invention is applied to a precision casting industry, has stability, hardly deforms due to high strength and hardly pollutes the metal cast due to low gray scale, is easy to demold, can be melted together with a wax mold to flow out of a shell during demolding; and the production rate can be effectively improved in the precision casting process.

A preparation method of near net-shape of porous silicon nitride/silicon oxynitride ceramic composite material relates to a preparation method of near net-shape of composite material. The invention solves the problem that the shrinkage ratio of ceramic body of Si3N4 in sintering process is bigger. The method is as follows: porous silicon nitride green ware body is prepared; the green ware body is pre-sintered; dipping, gelation and drying are carried out; sintering is carried out so that the porous silicon nitride/silicon oxynitride ceramic composite material is prepared. The porous silicon nitride/silicon oxynitride ceramic composite material prepared by the method in the invention reduces the shrinkage ratio of the body when sintering while reaching the requirement of mechanical property. The method in the invention has simple technology, low cost and good repeatability.

The invention discloses a rolling reduction control method under large liquid core pressure. A roller-type rolling mill is arranged at the position, with a liquid core, of the horizontal segment of a continuous casting machine, wherein a casting blank is not completely solidified at the position. The liquid core rate delta is obtained at the position of the rolling mill, and whether the liquid core rate delta is larger than 0 or not is judged. If the liquid core rate delta is larger than 0, the rolling mill conducts rolling under the large liquid core pressure on the casting blank, wherein the rolling reduction of the rolling under the large liquid core pressure is larger than or equal to the minimum rolling reduction delta H min, and the minimum rolling reduction meets the equation that delta H min=max [H*(epsilon v + epsilon l + delta), mu*S]. According to the rolling reduction control method, center porosity, segregation, internal cracks and the like of the casting blank can be removed, the quality of the casting blank is improved, and internal organization is refined; the internal quality of the rolled casting blank is remarkably improved, the density of the casting blank is improved, the linear shrinkage percentage of cooling from high temperature to room temperature is at least reduced by 1.5%, the model control is easy, and the rolling reduction control method is easy to implement.

The invention discloses a heat insulation mortar and a preparation method thereof, and relates-the technical field of cement mortars. The heat insulation mortar comprises 100-150 parts of ordinary Portland cement, 50-80 parts of glazed hollow beads, 50-70 parts of pre-gelatinized starch, 20-50 parts of coated expanded perlite, 20-30 parts of diatomaceous earth, 10-20 parts of modified attapulgite,10-15 parts of rubber particles, 10-15 parts of plant composite fiber, 2-8 parts of water glass, 2-6 parts of carboxymethylcellulose, 2-6 parts of refractory particles, 1-6 parts of an active admixture, 0.2-1.2 parts of a water repellent, 0.2-0.6 part of a physical foaming agent and 100-200 parts of water. The preparation method comprises the following steps: (1) preparing the coated expanded perlite; (2) preparing straw coated particles; (3) preparing a slurry; and (4) preparing the finished product. The heat insulation mortar has the advantages of excellent crack resistance, high bonding strength and strong adhesion.

The present invention belongs to the field of building energy-saving materials, and relates to white vitrified bead modified insulation masonry mortar and a using method thereof. The white vitrified bead modified insulation masonry mortar uses vitrified beads to partly replace aggregate, and comprises the fowling components by mass: 47.5-70.5% of a gelled material, 10%-35% of the vitrified beads, 3.6-20% of the aggregate, 0.3%-2% of dispersable emulsion powder, 0.1%-0.3% of hydroxypropyl methyl cellulose ether, 0.1%-1.2% of polypropylene fiber, 0.5%-1% of sepiolite fiber, 0.1%-0.5% of a waterproofing agent and 0.08%-0.3% of mortar king. The white vitrified bead modified insulation masonry mortar has excellent construction performance, good wall body bonding performance, and white color, and in the premise of meeting the basic mechanical properties and durability properties of the bonding mortar, effectively reduces the mortar thermal conductivity coefficient, saves building energy consumption, and is very broad in application development prospect.

The invention relates to a numerical control turning center with hydrostatic guide rails and a hydrostatic spindle system. A slant bed body is provided with an upper guide rail and a lower guide rail which are parallel with each other, and each guide rail is provided with a slide block; a static pressure chamber is arranged between each guide rail and each slide block matched with the guide rail, the periphery of the static pressure chamber is provided with sealing element, the static pressure chamber is communicated with an oil inlet and outlet pipe joint, and the oil inlet and outlet pipe joint is in threaded connection with the slide block and is connected with an oil supply device through a pipeline; the slant bed body is fixedly provided with a spindle box bracket, and the upper part of the spindle box bracket is fixedly connected with the hydrostatic spindle system mechanism; and the slant bed body is made of artificial granite materials. An oil film is formed between the slide block and the guide rail in working, the oil film has high rigidity, large bearing capacity and a vibration absorbing function, a coupling surface of the guide rails is not rubbed or abraded, the rigidity of guide rail structures is enhanced with fewer overall parts, the vibration is reduced in operation, and the accuracy is high.

The invention discloses a novel inorganic lightweight mortar and a reinforcing agent product. The novel inorganic lightweight mortar comprises the following components by mass: 75 to 85 parts of mineral fiber, 3.5 to 5.5 parts of magnesium carbonate (calcium carbonate), 2 to 4 parts of cellulose, 6 to 7.5 parts of water-proofing agent, 0.03 to 0.15 part of dispersing agent, and 4.5 to 6.5 parts of fiber. The novel inorganic lightweight mortar and the reinforcing agent product have the advantages that the operability of the inorganic lightweight mortar and the product can be obviously improved, the construction time is saved, the construction efficiency is improved, the construction cost is reduced, the tensile strength, the adhering strength and the softening coefficient of the inorganic lightweight mortar and the product are greatly improved; the linear shrinkage is reduced, the phenomena of hollowing, cracking and separating can be prevented, and the safety of the heat insulation material is improved; the inorganic lightweight mortar and the product with the reinforcing agent adopted are high in fireproofing grade, light in volume weight, low in coefficient of thermal conductivity, and excellent in heat insulation performance; and the reinforcing agent has no pollution in the production and application, and is environment-friendly and beneficial for recycling waste, so as to meet the requirement on energy conservation of a building.

The invention discloses lightweight plastering mortar and a preparation method thereof. The lightweight plastering mortar is prepared from the following components in parts by mass: 68 to 72 parts of anhydrite, 10 to 15 parts of cement, 8 to 10 parts of stone powder, 8 to 12 parts of vitrified micro bubbles of 70 to 90 meshes, 0.5 to 1.5 parts of an accelerator, 0.17 to 0.25 part of a water-retaining agent and 0.03 to 0.08 part of a lubricant. The preparation method of the lightweight plastering mortar comprises the steps of S1, weighing the raw materials in parts by mass; and S2, sieving the anhydrite weighed in the step S1 with a 200-mesh sieve to obtain sieved anhydrite, crushing the stone powder, sieving with a 0.2 mm-sieve to obtain sieved stone powder, uniformly mixing the sieved anhydrite, the sieved stone powder and the other raw materials weighed in the step S1, stirring and mixing for 4-6 minutes, and then sub-packaging to obtain the lightweight plastering mortar. Compared with the traditional cement mortar, the lightweight plastering mortar disclosed by the invention has the advantages of higher strength, higher bonding strength, lower linear shrinkage rate, stronger water-retaining property and the like.

The invention provides a self-flame-retardant organic silicon resin for a PCB, a preparation method of the self-flame-retardant organic silicon resin and a composition containing the self-flame-retardant organic silicon resin, the resin structure takes a cage-shaped structure as a fulcrum, and an organic silicon main chain similar to a ladder-shaped structure is connected to a side chain of the fulcrum through a flexible chain segment, so that the product has high strength and certain toughness; the thermal stability of the cured organic silicon resin is superior to that of common bisphenol Aepoxy resin; by adjusting the numerical values of m and n in the molecular structure, the product has high carbon-forming property, and the synthesized organic silicon resin belongs to a flame-retardant material and has certain flame retardancy; and the synthesized organic silicon resin contains a vinyl group, has high stability, is easy to store for a long time, has a simple curing process, doesnot produce micromolecular byproducts in the curing process, and has low shrinkage rate, good dimensional stability, low product thermal expansion coefficient and good heat conduction property after curing.

The invention provides casting wax and a preparation method thereof, and the casting wax comprises the following raw materials in parts by weight: 70-80 parts of methylene polymer, 15-25 parts of microcrystalline wax, 1.5-5 parts of modified rosin and 1-5 parts of PE oligomer. Through specific compounding of all the raw materials, the prepared casting wax has excellent bending strength, surface hardness and viscosity, small linear shrinkage and ash content and excellent heat stability, the mechanical property, the processing property and the heat stability of the casting wax all meet the requirements, related indexes of the casting wax are close to those of foreign imported products, and the casting wax is suitable for medium-temperature precision casting products and has wide application prospects. In addition, the coating has better coating property, flowability and reusability, and the product competitiveness is strong.