313results about How to "Low gas production" patented technology

The invention relates to a laser sintering sand, a preparation method thereof, a sand core and the preparation method thereof. The laser sintering sand consists of a first component and a second component which are evenly mixed, the first component consists of a first type of raw sand with the coefficient of angularity of less than 1.3, thermosetting resin and additives, wherein the thermosetting resin and the additives are coated on the surface of the first type of the raw sand; and the second component consists of a second type of raw sand with the coefficient of angularity of less than 1.1, a thermoplastic material and the additives, wherein the thermoplastic material and the additives are coated on the surface of the second type of the raw sand. The adoption of the laser sintering sand does not need to add an auxiliary support structure during the laser sintering process, thereby improving the molding efficiency and reducing the manual intervention; and the any complex sand core can be manufactured without using a mold, and the sand core simultaneously has high sintering initial strength and can meet the requirements on the thermal strength and the gas-generating capacity of the sand core during the metal casting process.

The invention relates to a centrifugal casting roller coating and a preparation method thereof. The centrifugal casting roller coating is characterized by comprising the following compositions in percentage by mass: 12 to 15 percent of zircon powder, 8 to 10 percent of quartz powder, 8 to 10 percent of bauxite, 0.3 to 0.6 percent of silica sol, 0.1 to 0.4 percent of sodium carboxymethyl cellulose, 0.15 to 0.35 percent of alkyl benzene sodium sulfonate, 0.15 to 0.35 percent of sodium sulfate, 0 to 0.02 percent of n-butyl alcohol, 0 to 0.02 percent of n-octyl alcohol, 0.10 to 0.18 percent of fatty alcohol polyethenoxy ether, and the balance being water, wherein the mass percentage of the zircon powder + the quartz powder + the bauxite is more than or equal to 30 percent and less than or equal to 35 percent, the mass percentage of the alkyl benzene sodium sulfonate + the sodium sulfate is more than or equal to 0.35 percent and less than or equal to 0.55 percent, and the mass percentage of the n-butyl alcohol + the n-octyl alcohol is more than or equal to 0.02 percent and less than or equal to 0.03 percent. The coating is used for centrifugal casting roller production after stirring, grinding and sieving, and has good use effect.

The invention relates to a sintering-strippable low-cost red water-based cast iron coating, which is prepared by the following raw materials in percent by mass: 20-45 percent of bauxite powder or powder quartz, 0-25 percent of mullite powder, 1-6 percent of talcum powder, 1-5 percent of iron trioxide powder, 1-3 percent of suspending agent, 1.5-4.5 percent of organic binding agent, 1.5-6 percent of inorganic binding agent, 0.01-0.05 percent of wetting agent, 0.02-0.05 percent of preservative, 0.02-0.1 percent of defoaming agent, 0-0.5 percent of water reducing agent and 30-42 percent of tap water. The sintering-strippable low-cost red water-based cast iron coating has the characteristics that the raw materials are cheap and the source is wide; the product is low-cost, safe, environmental-friendly and convenient to transport; the brushing property, the flowing resistance and the leveling property of the product are good, the suspension percentage, the coating strength and the crack resistance are high and the gas evolution is low; and the sintering-stripping performance is excellent, the most part of the coating can be vastly stripped after castings are taken out of a casting box and are cooled, the defects of sand sticking, sand inclusion, sand drop, voids and the like existing the castings can be effectively avoided, and the castings with excellent surface quality can be obtained.

The invention discloses easy-to-fill precoated sand and a preparation method thereof. Raw materials comprise roughing sand, phenolic resin, curing agents, lubricating agents and additives. The preparation method comprises the following steps that the roughing sand is heated to 130 to 170 DEG C, then, the phenolic rein, a half quantity of the lubricating agents, the curing agents and the rest half quantity of lubricating agents are sequentially added, finally, the discharging is carried out, and then, crushing, sieving and package are carried out. Through the improvement on the raw material ingredients and the preparation process, the forming intensity of the precoated sand is high, the high-temperature intensity is high, the deformation quantity is small, the flowability is good, complicated sand cores can be produced, the surface smoothness of the molding sand is good, the collapsibility performance is excellent, castings can be easily subjected to the vibration sand falling treatment, the precoated sand gas producing quantity is reduced, and the high-temperature performance and other casting performance of the precoated sand are improved.

The invention relates to a precoated sand for a casting field, in particular to a 3D printing precoated sand. The 3D printing precoated sand comprises the following components: 5-8 wt% of cashew nut shells, 1-2 wt% of melamino-formaldehyde resins, 1-5 wt% of cashew nut shell liquid modified phenolic resins, 0.6-0.8 wt% of urotropin, 0.1-0.4 wt% of lubricant, 0.1-0.8 wt% of binding agents, 0.1-0.4 wt% of coupling agents, 0.5-1 wt% of dispersing agents, and the balance of crude sands. The prepared 3D printing precoated sand has high strength, high-temperature resistance, low gas generating amount and low expansion rate.

The invention belongs to the field of casting, and particularly relates to high-strength, deformation-resisting and collapsible precoated sand and a preparation technology thereof. The precoated sand and the preparation technology aim to solve the technical problem that a sand core made of precoated sand according to a ratio is low in strength and prone to deformation. The high-strength, deformation-resisting and collapsible precoated sand is composed of crude sand, phenolic resin, curing agents, lubricants and disperser, wherein the crude sand is composed of 20%-30% of nice foundry sand and 70%-80% of quartz sand, the addition quantity of the phenolic resin is 0.9%-1.2% of the mass of the crude sand, the addition quantity of the curing agents is 9%-13% that of the phenolic resin, the addition quantity of the lubricants is 0.1%-0.15% of the mass of the crude sand, and the addition quantity of the disperser is 0.05%-0.4% of the mass of the crude sand. The invention further provides the preparation technology of the precoated sand. The precoated sand has the advantages of high temperature and normal temperature strength, high deformation resistance, good formability, easy collapsibility, good mobility and low gas-forming amount, and completely meets the production technology requirements of an engine with complex structure and high performance.

The invention discloses energy-saving type water group lost mould casting paint, which comprises a fireproof material, an adhesive, a suspension agent, an auxiliary agent and water, wherein the fireproof material is a composite fireproof material and comprises bauxite, zircon flour and pagodastone in parts by weight according to the mixture ratio of 20-40:60-80:5-10. The paint comprises the following components according to the mixture ratio, by weight percent: 60-80% of composite fireproof material, 0.5-3% of adhesive, 1-2% of suspension agent, 0.5-2% of auxiliary agent and the balance of water. The paint adopts the composite fireproof material under a precondition of ensuring the fire resistance of the paint, and the consumption of resource type materials in the lost mould paint is greatly reduced; the mixture ratio of the mixed paint of the invention can induce the high-temperature encrustation of the paint, the paint is easy to strip off from a cast, the energy consumption of sand removal is reduced, and the possibility of the generation of diversified defects at the surface of the cast is also reduced by the flaky stripping of a sintered paint layer during sand removal. Moreover, the pollution action of the components of the paint to the environment is also reduced greatly by adopting the phosphate auxiliary agent.

The invention belongs to the technical field of casting, and in particular, relates to high-temperature resistant precoated sand. The high-temperature resistant precoated sand comprises the following components in parts by weight: 100 parts of crude sand, 12-15 parts of adhesive, 2-5 parts of curing agent, 8-10 parts of coupling, 1-3 parts of lubricating agent, 5-10 parts of zirconium quartz powder and refractory fiber mixture, and 0.2-0.35 part of tantalum oxide. As the zirconium quartz powder and refractory fiber mixture is added in the precoated sand, and tantalum oxide serves as an additive, the total refractory durability and the self structure stability of the precoated sand are collaboratively improved, the tensile strength of the precoated sand is greatly improved above 8 MPa, the gas generating quantity is lower than 15, and the application prospect is broad.

The invention relates to a regeneration method of casting wet type mixed old sand. The regeneration method comprises the following steps: preprocessing casting wet type mixed old sand; wiping with water; drying; preheating; roasting; and post-processing. In the invention, components, such as bentonite, coal dust and ashes, in wet type old sand are effectively removed by a water wiping process, and a residual resin film in mixed old sand is thoroughly decomposed by a roasting process. The regeneration cost is low, and the regeneration effect is great. Actual production and verification show that the performance indexes of regenerated sand reach or surpass those of new sand. The regeneration method is successively applied to the core making production of cold boxes and has remarkable economical and social benefits.

The invention relates to a phosphate binder used for casting, which comprises the components by weight ratio: 45 to 55 percent of phosphoric acid, 33 to 45 percent of aluminium dihydrogen phosphate, 5 to 15 percent of boric acid and 6 to 12 percent of citric acid. The binder can also be mixedly matched with 0.5 to 2 percent of magnesium oxide curing agent by weight ratio. The binder adopts the phosphoric acid and the aluminium dihydrogen phosphate as a binder main body, and is added with the boric acid and citric acid for improving the bonding property, thus being one phosphate binder with good property used for casting. The binder has the advantages of low cost, little environmental pollution, high hot strength, good collapsibility and the like, can improve working environment to the utmost extent, and reduce production cost.

The invention discloses preparation of coated sand by the use of a phosphate inorganic binder and a molding method thereof. Preparation of the coated sand comprises the following steps: uniformly mixing the phosphate inorganic binder and quartz sand; heating and drying to a semi-dry state; adding calcium stearate with the granularity being 600 meshes and uniformly mixing; and drying and cooling so as to obtain the phosphate inorganic binder coated sand which is in a dry arenaceous state. During molding of the coated sand, the coated sand undergoes hydration only by high temperature steam, the binder is dissolved, sand grains are connected, and finally hot-air is blown for drying and curing molding. The hardening speed is fast. During preparation and curing molding of the coated sand, smell or any harmful gas or substance is not generated. The sand mould has low gas-forming property, is harmless to the health of workers, causes no pollution to the environment and is energy-saving and environmentally friendly. The coated sand provided by the invention has characteristics of high strength, high temperature resistance, low gas evolution, no curing agent required for molding and good storage stability.

The invention relates to a mold releasing coating for a centrifugal casting and a painting method of the mold releasing coating, in particular to a mold releasing coating for a nuclear power station main pipe in the centrifugal casting and a painting method of the mold releasing coating. The mold releasing coating comprises a base coating and a surface coating, wherein the base coating is used for coating the surface of a cast mold, and the surface coating is used for coating the base coating layer on the surface of the cast mold. The base coating comprises a component A, a component B, a component C and a component D, wherein the component A is graphite powder, the component B is bauxite or kieselguhr, the component C is talcum powder, and the component D is silica solution or aluminum phosphate. The surface coating comprises a component E, a component F, a component G, a component H and a component I, wherein the component E is quartz powder or high-aluminum powder or zirconium oxide powder, the component F is zirconium silicate powder or zircon powder or emery powder or bauxite, the component G is silica powder or kieselguhr, the component H is boracic slag powder, and the component I is a hydroxymethyl cellulose water solution or polyacrylamide hydroxyl or sodium alginate.

The invention discloses a carbon fiber-based precoated sand material for selective laser sintering and a preparation method thereof. The carbon fiber-based precoated sand material comprises chopped carbon fibers, crude sand, an organic binder, a curing agent, a lubricant, a coupling agent and a dispersant. The preparation method comprises the following steps of carrying out surface modification treatment on the chopped carbon fibers, heating the crude sand, adding resin, adding a part of calcium stearate and a prepared coupling agent aqueous solution, adding a chopped fiber-containing urotropine curing agent, adding the rest of the calcium stearate, carrying out cooling and carrying out screening and sand discharge to obtain the product. The carbon fiber-based precoated sand material has the advantages that 1, the carbon fibers have thermal conduction effects, limit integral shrinkage of a sintered part to a certain degree and reduce warp phenomenon in molding, and 2, through laser sintering, the precoated sand substantially improves resin precoated sand thermostability, promotes curing reaction of phenolic resin at locals in the sintered layer and between the sintered layers and obviously improves laser sintering forming part blank strength.

The invention is directed to a method of making a small crystal SSZ-32 zeolite, known as SSZ-32X. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is dewaxed to produce an isomerized product, with increased yield of isomerized material and decreased production of light ends.

The invention discloses pre-coated sand with high strength and a low gas evolution rate and a preparation method thereof. The pre-coated sand with high strength and low gas evolution rate is prepared from the following raw materials in parts by weight: 60-80 parts of quartz sand, 15-20 parts of celestite, 5-10 parts of wollastonite, 0.4-0.8 parts of ethenyl tri(beta-methoxyethyoxyl) silane, 4-6 parts of pentaerythritol oleate, 3-5 parts of epoxy soybean oil, 2-3 parts of nano magnesium oxide, 0.5-1.5 parts of bisphenol A epoxy resin, 1-2 parts of thermosetting phenol resin, 3-6 parts of diaminodiphenyl methane, 5-10 parts of urotropine, 4-8 parts of calcium stearate and 3-5 parts of composite powder. Compared with the conventional pre-coated sand, the pre-coated sand disclosed by the invention is not only high in strength, good in heat resistance, good in mobility and small in roughness, but also good in gas permeability and low in gas evolution rate, so that a casting piece can be effectively prevented from generating defects such as pin holes, nitrogen gas holes and burnt-on sand, and therefore, the yield of the casting piece is greatly improved.

The invention discloses alcohol-group dry powder sand mould foundry coating, which comprises the following components in percentage by weight: 60-75% of bauxite, 2-10% of amorphous graphite, 3-15% of lamellar graphite, 2-10% of iron oxide red, 1-5% of attapulgite, 0.5-1.5% of sodium bentonite, 1-5% of polyvinyl butyral, 0.1-0.5% of surfactant and 0.1-0.5% of dispersing agent. The dry powder coating has the advantages of simple preparation technology, convenience in use and good high-temperature sand adhesiveness resistance.

The invention discloses a paint formula, particularly discloses a lost foam steel-casting paint formula and a technology method thereof. The lost foam steel-casting paint formula comprises the following components: 40-60% of bauxite, 30-50% of zirconium sand powder, 1-3% of phenolic resin, 1-5% of white emulsion, 1-5% of silica sol, 1-5% of lithium bentonite, 0.1-0.5% of isopropanol, 0.5-2% of CMC and 0.1-0.5% of JFC. The technology method of the lost foam steel-casting paint formula comprises the following steps: 1, in the ratio of paint powder to water of 1:0.7, putting the paint powder and the water into a stirrer for stirring for 1-1.5 hours, then measuring baume degree, and controlling the baume degree between 65 and 70 through dilution with water; 2, according to production requirements, dip-coating for two times or three times; and 3, the thickness of a coating layer being 1-2 mm. White molds of the paint formula have good wettability, good coating and hanging properties, high strength and good air permeability.