2425results about How to "Small shrinkage" patented technology

A manufacturing method for a sintered body with a buried metallic member comprises forming an alumina sintered body or an alumina presintered body, forming a metallic member by printing a printing paste including a refractory metal on the alumina sintered body or the alumina presintered body, forming an alumina compact on the metallic member, and sintering the alumina compact, the metallic member, and the alumina sintered body or the alumina presintered body.

The invention discloses a mud-proof slump-retaining type polycarboxylate superplasticizer with low shrinkage and high adaptability and a low-temperature preparation method thereof. The polycarboxylatesuperplasticizer is mainly prepared by the following steps: carrying out free radical polymerization on 4-hydroxybutylvinyl polyoxyethylene ether, unsaturated carboxylic acid, an unsaturated amide-type monomer, dipolyethylene glycol maleate, an unsaturated quaternary ammonium cationic monomer, an oxidizing agent, a catalyst, a reducing agent, a chain transfer agent and deionized water at 5-15 DEGC through an aqueous solution, regulating pH value by adding a sodium hydroxide solution, and supplementing water. The preparation method of the invention has advantages of low-temperature production, no heat source, simple equipment, no pollution, short reaction time and high production efficiency. The prepared mud-proof slump-retaining type polycarboxylate superplasticizer endows concrete withgood workability, good adaptability, low shrinkage and high strength, has excellent mud-proof slump-retaining property, and greatly reduces construction difficulty.

The invention relates to a polyurethane resin mortar composition for cement base material repairing, which comprises raw materials A, B and C, wherein the raw material A comprises the following materials in parts by weight: 100 parts of polyalcohol, 5-60 parts of plasticizer, 0.01-3 parts of catalyst, 0-2 parts of defoaming agent, 0-30 parts of chain extender or crosslinking agent, 0-3 parts of coupling agent and 0-10 parts of stabilizer; the raw material B is isocyanate or prepolymer thereof; the raw material C is solid filler; and the mass ratio of the three raw materials A, B and C is 10:(1-30):(10-200). The composition is used as the repairing material for concrete structures of ballastless tracks and cement asphalt mortar, and has the advantages of high curing speed, good low-temperature curing property, high ductility and the like.

The invention discloses polyurethane rigid foam and a preparation method thereof, wherein foam plastic is prepared from the following raw materials by a high pressure foaming machine in parts by weight: 100 parts of combined polyether, 1.5-3 parts of surfactant, 1.5-3 parts of complex catalyst, 1-3 parts of water, 16-26 parts of mixed foaming agent and 140-170 parts of polymerized isocyanate, wherein the mixed foaming agent consists of methyl formate and 1,1,1,3,3-pentafluoropropane (HFC-245fa). The prepared polyurethane foam has low heat conductivity, good dimensional stability and proper cost.

The invention relates to vehicle used high-temperature lead acid battery negative pole lead plaster and a preparation method thereof, belongs to the storage battery technical field and is used for improving the high-temperature service life and the low-temperature starting capacity of the storage battery. The technical proposal is as follows: the lead plaster solid raw material comprises the following materials by the weight unit: 100 units of lead powder, 0.01 to 0.5 units of sodium lignosulfonate, 0.01 to 0.8 units of high-temperature sodium lignosulfonate, 0.01 to 1.0 unit of graphite powder, 0.03 to 0.08 units of fibre, 0.3 to 1.2 units of barium sulfate, 0.2 to 1.0 units of humic acid and 0.1 to 0.4 units of black carbon. The materials, such as the high-temperature sodium lignosulfonate and the graphite powder are added to the compounding recipe of the negative pole lead plaster, thereby the performance of the negative pole active materials is effectively improved at the high temperature by matching with the reasonable compounding recipe ratios of the added materials, the contraction is reduced, thereby the high-temperature service life and the low-temperature starting capacity of the storage battery are enhanced, particularly the high-temperature service life can be above 90 percent higher than the storage battery prepared based on a common compounding recipe.

The invention relates to machine-spraying-type plastering gypsum and a preparation technology thereof and belongs to the technical field of building materials. The machine-spraying-type plastering gypsum is characterized by being prepared from the following raw materials: 200-400 parts of gypsum, 10-60 parts of cement, 520-650 parts of fine aggregate, 80-160 parts of heavy calcium powder, 2-4 parts of redispersible emulsion powder, 2-4 parts of hydroxypropyl methyl cellulose ether, 0.15-0.25 part of an air entraining agent, 5-10 parts of expanded perlite, 0.3-0.8 part of a gypsum retarder and 200-300 parts of water. The machine-spraying-type plastering gypsum is applicable to being directly sprayed to a wall surface by adopting a mortar spraying machine, both time and labour are saved, construction efficiency can be improved, and cost is reduced; bonding performance with the wall surface is good, rebounce is not caused, anti-sagging performance is good, both bonding strength and compressive strength can meet requirements, and cracking of a wall body can be reduced; and usage amount of gypsum is low, and cost can be effectively reduced.

The invention provides a method for welding an anticorrosion steel pipeline with no internal repaired mouth, which is applicable to the anticorrosion treatment of a steel pipeline welding connector with an anticorrosion coating in the petroleum industry and the chemical industry. The method is characterized in that a groove with a certain length and depth is machined on a position which is at a certain distance from the end part of the steel pipe, an anticorrosion alloy material is surfaced on the groove, the end part of the surfaced steel pipe is machined into a V-shaped groove, an anticorrosion coating with sufficient thickness is coated on the inner wall of the steel pipe, the anticorrosion coating covers sufficient length of the anticorrosion alloy surfacing layer, then two steel pipes are in butt connection with each other, layering welding is carried out after the two steel pipes are fixed on one point, an argon tungsten-arc welding method is adopted, the anticorrosion alloy material which is identical to that of the surfacing is selected as the filling material, and argon is filled into the pipe to protect the pipe in the welding process. Due to the adoption of the novel technology for welding the anticorrosion steel pipeline with no internal repaired mouth, the corrosion resistance of the inner wall and a weld mouth of the pipeline can be guaranteed, the internal mouth repairing technology on the spot after the welding can be avoided, characteristics such as simplicity in construction and reliability in performance can be realized, and the method is suitable for the real engineering application of the petroleum and chemical industry fields.

The present invention provides an anisotropic conductive adhesive comprising an insulating adhesive component and a large number of conductive particles dispersed in the insulating adhesive component, wherein the insulating adhesive component contains alternating Linked rubber resin. When connecting circuits, by minimizing the thermal shrinkage of the anisotropic conductive adhesive in the polymerization reaction or curing reaction, it is possible to prevent peeling of the adhesive or a decrease in the bonding strength of the circuit. It prevents short-circuit between adjacent electrodes and is excellent in long-term reliability.