3108 results about "Magnesium Hydrate" patented technology

The invention provides a brine purification technical method which comprises that: a first step is that limewater is added into brine so that reaction happens to calcium hydroxide in the limewater and magnesian ion in the brine to generate magnesium hydrate sedimentation, the magnesian ion in the brine is removed, excessive calcium hydroxide is used for causticizing the sodium sulfate in the brine into sodium hydroxide; a second step is that flue gas is put into the brine after the magnesian ion is removed for carrying out reaction between carbon dioxide in the flue gas and the sodium hydroxide causticized in the brine to generate sodium carbonate which reacts with calcium ion in the brine to generate calcium carbonate sedimentation, the calcium ion in the brine is removed; a third step is that slurry produced in the first step and the second step is collected; and a fourth step is that refined brine after being treated by the first step and the second step is recycled. The technical method can reduce the pollution to environment, can save energy, and can reduce the consumption of raw brine and the purification cost of the brine at the same time, thereby conforming to the requirements of the strategy of sustainable development.

The invention discloses a halogen-free cable material which is irradiation cross-linked, has less smoke and can retard the inflaming of polyolefine, and consists of the following components by mass: 30 to 50 percent of ethylene-vinyl acetate copolymer, 0 to 20 percent of high-density polyethylene, 30 to 60 percent of magnesium hydrate, 0 to 10 percent of red phosphorus, 1 to 5 percent of resin acceptor, 0.1 to 1.5 percent of cross linker, 1 to 5 percent of compatilizer, 0.1 to 1.5 percent of antioxidizer and 0.1 to 1.5 percent of lubricating agent. The halogen-free cable material which is irradiation cross-linked, has less smoke and can retard the inflaming of polyolefine overcomes the harm to the environment and the human bodies when retarding the inflaming of polyolefine material by using traditional halogen-containing flame retardants, has less smoke, innoxiousness, green and environment protection, and can ensure good mechanical performance, flame retarding performance and processing performance.

The invention relates to a process for leaching rare earth from ion-adsorption type rare earth ore without using ammonium salt. The process comprises the step of replacing ammonium salt by taking a mixture of calcium, magnesium and sodium salts as a leaching agent and taking non-ammonium salts, such as calcium hydroxide, magnesium hydrate or sodium hydroxide as a precipitator. According to the process disclosed by the invention, the ammonia nitrogen pollution problem in exploitation of ion-adsorption type rare earth is radically solved; environmental-friendly exploitation of the ion-adsorption type rare earth can be realized; the process disclosed by the invention has higher economic benefit and social benefit.

The invention provides an ultraviolet light crosslinking low-smoke zero-halogen flame-retardant cable material. The cable material comprises polyolefin, a compatilizer, an inorganic flame retardant, an organic phosphorus-nitrogen-containing flame retardant, a flame-retardant synergist, a photoinitiator, an assistant crosslinker, a surfactant, an antioxidant and a lubricant, wherein polyolefin contains low-density polyethylene, an ethylene-octylene copolymer and an ethylene-vinyl acetate copolymer in the weight proportion being (10-25):(20-35):(55-65); the compatilizer is polyethylene for grafting of maleic anhydride; the inorganic flame retardant is selected from magnesium hydroxide and aluminum hydroxide; the organic phosphorus-nitrogen-containing flame retardant contains polyphosphoric acid, pentaerythritol and melamine in the weight proportion being (10-20): (4-8): (15-30); the flame-retardant synergist contains zinc borate and/or polydimethylsiloxane. The cable material has good thermal resistance and anti-aging performance, can be used at the temperature of 125 DEG C for a long time and is excellent in comprehensive mechanical performance and better in flame retardance.

Disclosed is an additive for a plastic, comprising fine particles obtained by calcination and slaking of a dolomite which exhibits two endothermic peaks in the differential thermal analysis, said fine particles containing calcium carbonate, magnesium carbonate, magnesium oxide, calcium hydroxide and magnesium hydroxide as main chemical components and also containing an ignition loss component in an amount of 10 to 40% by weight based on the weight of said fine particles. A plastic hating hydrogen chloride scavenging properties and antimicrobial properties imparted by incorporating the additive for a plastic is also disclosed.

The invention discloses a composite intumescent flame retardant which is composed of the following components in percentage by weight: 50-65% of acid source, 10-20% of gas source, 15-20% of carbon source and 10-20% of smoke inhibitor. The acid source is composed of at least one of ammonium polyphosphate, melamine phosphate and melamine polyphosphate, wherein the ammonium polyphosphate is crystal II ammonium polyphosphate with the average degree of polymerization of greater than 1000; the gas source is composed of at least one of melamine and dicyandiamide; the carbon source is composed of at least one of pentaerythritol and bis pentaerythritol; and the smoke inhibitor is composed of at least one of magnesium hydroxide, aluminum hydroxide and zinc borate. The invention also discloses a preparation method of the composite intumescent flame retardant.

The invention relates to an inorganic heat-insulating material and a preparation method thereof. The inorganic heat-insulating material is prepared from the following raw materials in parts by weight: 15-37 parts of basic material, 45-70 percent of pigment and filler and 9-26 parts of auxiliary agent, wherein the basic material comprises the following raw materials in parts by weight: 10-20 partsof phosphoric acid, 3-8 parts of aluminium hydroxide, 2-8 parts of aluminum-silver slurry auxiliary agent, 0.5-5 parts of silicate and 1-5 parts of sodium carboxymethyl cellulose; the pigment and filler is one or a combination of potassium titanate whiskers, expanded perlite, ceramic microspheres, nano-silicon dioxide aerogel, heat-insulating powder, carbon fibers, meerschaum, needle-shaped wollastonite powder and magnesium hydrate; and the auxiliary agent is one or a combination of boron nitride, dichromium trioxide, glass powder, boric acid, nano-zirconia, calcium oxide and calcium-based bentonite. The invention inorganic heat-insulating material has strong insulating capability for solid conductive heat at high temperature (150-500 DEG C) and simultaneously also has strong insulating capability for radiation and flow conductive heat.

The invention provides a 105 DEG C thermoplastic, halogen-free, low-smoke, fire-retardant and ultraviolet-resistant covering material capable of preventing mice and ants and resisting cracking. The covering material comprises the following raw materials: an ethylene vinyl acetate copolymer, linear low density polyethylene, high density polyethylene, ethylene-octene copolymer elastomer, a maleic anhydride grafting material, silicone master batch, aluminium hydroxide, magnesium hydrate, zinc borate, a phosphorus-nitrogen type intumescent flame retardant, a silane coupling agent, a lubricating agent, a complex antioxidant, a light stabilizer, and an environment-friendly mice and ants preventing agent. The preparation method comprises the following steps: uniformly mixing the raw materials above through a high-speed mixer; and then extruding and granulating through a double-step single-screw reciprocating extruding unit to obtain the covering material. The covering material is scientific and reasonable in formula and matching, and advanced in process; the prepared 105 DEG C thermoplastic, halogen-free, low-smoke, fire-retardant and ultraviolet-resistant covering material capable of preventing mice and ants and resisting cracking is applicable to manufacture of cables, and the prepared cable is high in mechanical performance, flame retardant performance, electrical performance and low-temperature performance, outstanding in resistance to mice and ants, resistance to thermo-oxidative aging, and excellent in resistance to high-temperature cracking.

The invention relates to a method for preparing hollow cavity type ZSM-5 modified zeolite molecular sieve, and aims to solve the problems that the microcellular structure diffusion admittance is narrow, the modified zeolite molecular sieve has lower relative degree of crystallinity, and the adjustable range of apertures inside molecular sieve is small, thereby facilitating macromolecule reaction limited by diffusion. The invention adopts at least one 0.1-8.5 mol/L acid solution of hydrochloric acid, nitric acid, sulphuric acid or acetic acid to treat ZSM-5 molecular sieve raw powder with the silica alumina ratio SiO2/Al2O3 being 20-1000 and the particle size being 0.4-10 Mum for 1-8 h; then at least one 0.1-5.0 mol/L aqueous alkali of sodium hydroxide, magnesium hydrate, potassium hydroxide, sodium carbonate or sodium bicarbonate is used for treatment for 1-48 h at 20-90 DEG C; and at least one 0.1-8.5 mol/L acid solution of hydrochloric acid, nitric acid, sulphuric acid or acetic acid is used for treatment for 1-48 h at 20-90 DEG C to obtain the modified ZSM-5 molecular sieve. The problems are well solved, and the invention can be used in industrial production of macromolecule catalysis and transformation catalysts.

The invention relates to a pulp technology of aspen by using a chemical-mechanical method. Aspen sizing agent which is decatized and is extruded and dispersed for a space is infused in peroxide using magnesium hydrate as an alkali source and is mechanically grinded by adopting the enzyme pretreatment technique, then the sizing agent high density storage bleaching is acted, finally, chemical-mechanical pulp with high whiteness and high yield is manufactured through a second stage jordaning production. The method of the invention realizes that the pulp yield and the optical performance are increased, the energy consumption for jordaning is lowered, the load of wastewater pollution is lowered, and the scale formation problem is eliminated.

The invention discloses a halogen-free flame-retardant polyamide 6 composition with high toughness and antistatic property. The composition comprises active magnesium hydrate, organic phosphate oligomer, zinc oxide crystal whisker, a macromolecular compatilizer, a plasticizer and an additive. The active magnesium hydrate and the organic phosphate oligomer are used to improve flame retardance; organic anlistatig and the zinc oxide crystal whisker are used to improve the antistatic property; and the macromolecular compatilizer is used to improve interaction among polyamide, the inorganic magnesium hydrate and the zinc oxide crystal whisker. The flame-retardant polyamide 6 composition has the advantages that compared with a sole magnesium hydrate flame-retardant polyamide 6, the use amount of the magnesium hydrate is reduced to below 50 mass percent; the impact strength of a gap is increased by over 80 percent; the breaking elongation rate is improved by approximately 20 times; the resistivity is reduced by 4 orders of magnitude; the flame retardant performance reaches UL94V-0 level; simultaneously, the toughness is basically maintained at the level of pure polyamide 6; the temperature for thermal deformation is much higher than 65 DEG C of the pure polyamide 6; and the molding shrinkage rate is reduced to 0.6 percent from 1.78 percent of the pure polyamide 6.

The invention discloses a radiation-resistant halogen-free low smoke flame retardant insulating material for cables of nuclear power plants and a preparation method. The radiation-resistant halogen-free low smoke flame retardant insulating material is prepared from the following raw materials: ethylene propylene diene rubber, phenyl siloxane rubber, magnesium hydrate, aluminium hydroxide, zinc borate, white carbon black, cerium dioxide, zinc oxide, Bis(tert-butyldioxyisopropyl)benzene, tri allyl cyanurate, 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline, Aflux A-25, stearic acid, vinyl tris(beta-methoxyethoxy) silane, and paraffin oil by heating and mixing. The formulation and the mixture ratio are scientific and reasonable, and the process is advanced. The prepared insulating material has good radiation resistance, excellent mechanical property, good electrical property and long service life, and is a good radiation-resistant halogen-free low smoke flame retardant insulating material for manufacturing the cables of the nuclear power plants.

The present invention provides a composite flame retardant which can be produced without using any toxic metal such as antimony trioxide or any halogen such as bromine and chlorine and can exhibit excellent flame retardancy compared with magnesium hydroxide when added in a smaller amount; and a flame retardant resin composition having excellent flame retardancy and excellent physical properties. The present invention relates to a flame retardant including: (A) 100 parts by mass of a reaction product of piperazine with one phosphorus compound selected from phosphoric acid, pyrophosphoric acid, and polyphosphoric acid; (B) 10 to 1000 parts by mass of a reaction product of melamine with a polyacid selected from cyanuric acid, phosphoric acid, pyrophosphoric acid, and polyphosphoric acid; and (C) 0.1 to 100 parts by mass of a reaction product of calcium or magnesium with silicic acid.

The present invention relates to a high-effective compound flocculating agent, its preparation method and application. Said flocculating agent is composed of flocculating agent and coagulant aids, in which the flocculating agent mainly is polymeric aluminium iron or polymeric aluminium, and the coagulant aids mainly have two classes, one is inorganic compound, for example sodium silicate, calcium hydroxide, calcium carbonate, magnesium hydroxide and high-molecular coagulant aids, and another is organic substance, for example polyacrylamine, dodecyl dimethyl tertiary amine, dicyandiamide and modified chitosan. It can be used for treating dyeing waste water.

The present invention provides a process for concentrated PUFA oil, characterized in that alcoholysis reaction using lipase is carried out in the presence of a small amount of water and at least one compound as an additive selected from magnesium oxide, magnesium hydroxide, calcium oxide and calcium hydroxide, and then separation is conducted to obtain a glyceride fraction.

The invention discloses a halogen-free flame retardant, high-temperature resisting and rapidly solidified deacetone silicon rubber and a preparation method thereof. Hydroxy-end-capped polydimethylsiloxane is used as the main body and is compounded with a thermal-resisting additive and a flame retardant additive, wherein the halogen-free flame retardant, high-temperature resisting and rapidly solidified deacetone silicon rubber comprises the following ingredients by weight: 100 parts of the hydroxy-end-capped polydimethylsiloxane serving as a main body, 1-50 parts of polydimethylsiloxane, 5-18 parts of silicon oxide, 5-15 parts of thermal-resisting additive, 50-200 parts of flame retardant additive, 0.5-2.5 parts of tackifier, 0.5-1 part of organic guanidine catalyst and 5-8 parts of deacetone siloxane cross-linking agent; the thermal-resisting additive is one or a mixture of several of iron oxide red, cerium oxide of which the purity is not less than 90% and tin oxide of rutile structure; and the flame retardant additive is one or a mixture of several of aluminum hydroxide, magnesium hydrate, zinc borate, phosphate ester, phosphonate, phosphine oxide and organic phosphorus. The deacetone silicon rubber has good thermal resistance, flame retardant effect and mechanical properties at 250-300 DEG C, and is simple in preparation method and high in production efficiency.

The invention discloses a photovoltaic cable and a manufacturing method and application thereof. The photovoltaic cable comprises an insulating layer and a jacket layer; the insulating layer comprises the following components: EVA (ethylene-vinyl acetate copolymer), LLDPE (linear low density polyethylene), EMA (ethylene-methyl acrylate), EVA-g-MAH (ethylene-vinyl acetate copolymer grafted maleic anhydride), magnesium hydrate, organic montmorillonoid, a cross-linked sensitizing agent, a lubricating agent, an antioxidant, a light stabilizer and a copper resisting agent; and the jacket comprisesthe following components: EVA, LLDPE, EMA, EVA-g-MAH, color masterbatch, magnesium hydrate, a phosphor series fire retardant, melamine chlorinated isocyanurates, zinc borate, a cross-linked sensitizing agent, a lubricating agent, an antioxidant, a light stabilizer and a copper resisting agent. According to the invention, the photovoltaic cable is manufactured by extruding insulating layer aggregates and jacket layer aggregates on a cable double-layer co-extrusion machine, wrapping the aggregates on the outer surface of a conductor in sequence and carrying out forming, air cooling, coiling andirradiation. The manufacturing method disclosed by the invention has the advantages of good machining property, favorable machining property and low cost and is suitable for industrial production; and the manufactured photovoltaic cable is environment-friendly and has excellent mechanical property, flame radiation resistance performance, thermal ageing property and weather fastness.

The invention relates to an ion-adsorption-type rare earth extracting method. The method comprises the following steps of: by taking an aqueous solution containing magnesium sulfate or the magnesium sulfate and/or ferric sulfate or the magnesium sulfate and/or aluminum sulfate as main components as an ore leaching agent, leaching ion-adsorption-type rare earth ore; dissolving rare earth ions in the rare earth ore with magnesium, ferric and aluminum ions and the like in an iron exchanging manner, thereby obtaining a leachate; and by taking magnesium hydrate or magnesium oxide or magnesium carbonate as a precipitator, thereby generating a rare earth hydrate or a rare earth carbonate. The method is simple in process and strong in raw material adaptability, and can be used for economically and effectively leaching the rare earth from the ion-adsorption-type rare earth ore, thereby completely avoiding the problem of ammonia nitrogen pollution caused by an existing leaching process. Therefore, the method is a sanitary production process.

The invention discloses PET (polyethylene glycol terephthalate) fiber/aramid fiber composite sound absorbing cotton, which is prepared from the following ingredients in parts by weight: 70 to 80 parts of PET fibers, 40 to 50 parts of aramid fibers, 10 to 15 parts of emulsifying agents OP-50, 5 to 10 parts of peregal O-35, 80 to 100 parts of PP (propene polymer), 30 to 40 parts of MBS (methylmethacrylate butadiene styrene), 15 to 20 parts of nanometer attapulgite, 10 to 15 parts of modified kieselguhr, 2 to 3 parts of stearic acid, 5 to 8 parts of epoxy soybean butyl oleate, 4 to 6 parts of magnesium hydrate, 2 to 3 parts of ethylene bis stearamide, 1 to 2 parts of aniline methyl triethoxysilane, 2 to 3 parts of zinc stearate, 1 to 2 parts of lead sulfate tribasic, 0.5 to 1.5 parts of anti-agents TPPD and 1 to 2 parts of antioxidants 246. The sound absorbing cotton prepared by the invention has the advantages that the appearance evenness is good, the thickness is uniform, the hand feeling is soft, the product bonding degree is good, the tensile performance is high, the sound absorbing performance is excellent, the flame retardant effect is good, and the like.

The invention relates to a formula design for a thermoplastic halogen-free low-smoke flame-retardant cable insulating material and the manufacturing process thereof, concretely, using polyethene copolymer and/or modified ethylene-propylene rubber as a substrate, adding in halogen-free and nontoxic flame-retardant agent (nano magnesium hydroxide or aluminum hydroxide) and inorganic crystal whisker strengthening material as primary components, and adding in proper assistant, proportioning, mixing, plasticizing and making grains to make the insulating material. Its technical characters: not containing halogen, P, Al and other heavy metals; having god mechanical property, machining property and superior flame retardancy and having excellent thermal deforming, thermal ageing and thermal shock properties. The made cables have high safety and reliability. It is applied to the cables operating at 70 deg.C-105 deg.C long time, such as ship cables, cables for nuclear power plants, power and control cables for high-rise buildings, etc.