62results about How to "Strong resistance to moisture absorption" patented technology

The invention discloses a flame retardant of boron polysiloxane, including the following steps: (1)adding acetic acid or hydrochloric acid into water, adjusting pH from 1.8 to 5.0, then adding silane mixture which molar ratio with water is 1:3~20, stirring for hydrolysis at 60~90deg.C for 0.5~5 hours, generating silicon alcohol, adding solvent for extraction to separate the organic phase, (2)adding boric acid into the organic phase for reaction at 70~110deg.C for 2~16 hours, conducting vacuum distillation to remove solvent to obtain the flame retardant of boron polysiloxane, in which, the molar ratio of oxygen in silanol and boric in boric acid is 1:0.3~3.0. Adding 3% to 5% of this fire retardant into polycarbonate can raise the flame retardant level of UL94 to V0, and the flame-retardant polycarbonate has good mechanical properties, high transparency, brushing tolerance, non-corrosive, without harm to the environment.

The invention discloses a composite sound-proof formed foaming automobile carpet and a preparation method thereof. The carpet is made of three layers of materials, namely a fabric layer, a middle multi-layer co-extrusion film layer and a bottom material layer, wherein the fabric layer is made of polyester fiber; the middle multi-layer co-extrusion film layer is made of PE/PE/AD/NYLON/AD/PE/PE multi-layer co-extrusion films; and the bottom material layer is made of polyester fiber. The sound-proof formed foaming automobile carpet provided by the invention has good sound insulation effect, can effectively prevent PU foaming breakdown, and has no toxic odor such as formaldehyde and the like and no penetrating odor; the fabric of the carpet has elegant color and the loop appearance can be adjusted; and the composite sound-proof formed foaming automobile carpet is an environment-friendly carpet with high sound insulation performance. The method for preparing the composite sound-proof formed foaming automobile carpet provided by the invention has simple process, high efficiency, strong operability, high qualification rate of finished products, and can be suitable for mass production.

The invention discloses a high-niobium high-chromium alloy cast ion self-protection flux-cored wire for grinding roller surfacing and a preparation method thereof. The flux-cored wire is composed of a ferrite stainless steel band and flux powder wrapped with the ferrite stainless steel band. The flux powder is prepared from, by weight, 42.0-48.0% of high-carbon chromium iron, 13.0-16.0% of niobium iron, 4.5-5.0% of graphite, 1.5-2.0% of silicon iron, 2.0-3.0% of electrolytic manganese, 1.5-2.0% of medium-carbon ferroboron, 1.0-2.0% of aluminum-magnesium alloy, 0.5-1.0% of cryolite, 0.5-1.0% of fluorite, 1.0-1.5% of lithium carbonate, 0.5-1.0% of zircon sand, 1.0-1.5% of potassium titanate, 1.5-2.0% of sodium titanate and the balance iron powder. The preparation method includes the steps that the flux powder is added into a U-type tank after being preprocessed; and four times of continuous drawing and diameter reducing are sequentially carried out after the opening of the U-type tank is closed, and the flux-cored wire is obtained. The flux-cored wire has the advantages that the hardness of deposited metal of a surfacing layer is stable, welding spatter is little and high-stress abrasive wear resistance is good, and is particularly suitable for surfacing repair and remanufacturing of cement grinding rollers.

The invention provides a modified calcium oxide expansion agent for cement concrete. The modified calcium oxide expansion agent for the cement concrete has the specific surface area of 100-600m<2>/kg and is prepared from a degradable high polymer and calcium oxide expansion clinker. According to the modified calcium oxide expansion agent for the cement concrete, provided by the invention, the invalid hydration of calcium oxide at a plastic stage of concrete is reduced, the hardened expansion quantity is increased, and the shelf life of the product can be further prolonged; the expansion agent can be applied to the crack resisting and seepage prevention of a concrete structure and can be used for greatly improving the durability of the concrete.

A non-TNT high-energy powder explosive is prepared from composite wax (4-6%), additive (0.5-4%) and ammonium nitrate (rest) through changing the oxidant and combustible agent to liquid state, mixing, airflow atomizing for dewatering, granulating, drying and cooling in sealed water cooler. Its advantages are no environmental pollution, and high explosion power.

The invention discloses a seamless submerged arc flux-cored wire for welding a high manganese steel LNG storage tank. The seamless submerged arc flux-cored wire is composed of outer skin and flux-cored powder. The flux-cored powder accounts for 30-40wt% of the total weight of the wire. The flux-cored powder comprises the following components in parts by weight: 75-85 parts of manganese metal, 4-8parts of chromium carbide, 1-3.5 parts of chromium metal, 3-5 parts of molybdenum metal, 0.5-1.5 parts of silicon iron, 1-2 parts of ferrotitanium, 0-8 parts of iron powder, 0.5-1 part of aluminum oxide and 0.5-1 part of fluorite. The flux-cored wire is good in manufacturability, excellent in toughness at 196 DEG C below zero, low in cost and suitable for welding the high manganese steel LNG storage tank.

The invention discloses seamless submerged arc flux-cored wire capable of realizing postweld heat treatment and belongs to the technical field of welding materials. The seamless submerged arc flux-cored wire is composed of an outer skin and flux-cored powder, the flux-cored powder comprises the following components in percentage by mass: 8-12% of nickle powder, 0.5-1.5% of ferromolybdenum, 12-20%of manganese metal, 3-7% of rare earth ferrosilicon, 1-2% of ferrotitanium, 1-3% of ferroboron, 0.5-1% of potassium fluosilicate, 0.5-1% of graphite and the balance of iron powder and unavoidable impurities. After heat treatment, low-alloy high-strength steel welded by adopting the seamless submerged arc flux-cored wire has low diffusible hydrogen content, stable mechanical property and proper strength, and the impact energy at minus 50 DEG C can reach 110 J or above; and in addition, after welding and heat treatment, welding seam metal welded by adopting the seamless submerged arc flux-coredwire has high toughness, so that the seamless submerged arc flux-cored wire is suitable for welding of low-alloy high-strength steel needing postweld heat treatment.

The invention discloses a sterilization and smoke suppression halogen-free wood fire retardant. The sterilization and smoke suppression halogen-free wood fire retardant is composed of, by mass, 40-80 parts of guanyl urea phosphate, 30-50 parts of urea, 10-20 parts of zinc borate, 5-10 parts of ammonium molybdate, 3-10 parts of pentaerythritol, 1-20 parts of ammonium dihydrogen phosphate, 12-25 parts of silica sol, 3-15 parts of decabromodiphenyl ether, 5-10 parts of fatty alcohol-polyoxyethylene ether, 1-20 parts of hexadecyltrimethoxysilane, and 1-20 parts of nanometer titania modified by one of Pt, Ag and Fe<3+>. The sterilization and smoke suppression halogen-free wood fire retardant is good in flame retardant property, high in anti-moisture absorption property and leaching resistance, good in stability, completely non-poisonous and low in cost and has the smoke suppression and sterilization effects.

The invention discloses a potassium titanate welding rod material and a preparation method thereof. The welding rod material is mainly composed of components of, by weight, 50 parts of potassium carbonate, 40-60 parts of titanium dioxide, 1-7 parts of carbon nano tubes, 5-15 parts of kieselguhr, 1-9 parts of tungsten carbide, 2-8 parts of chromium carbide and 0.5-1.5 parts of nano silica. Compared with the prior art, the welding rod material is used as an additive of welding chemicals, the advantages of both good mobility and high anti-moisture absorption property in the prior art are achieved, most importantly, arc voltage can be reduced apparently, arcs are stabilized, spattering is reduced, and the content of sulphur and phosphorus of the welding rod material is reduced apparently.

The invention discloses a nickel-saving high-nitrogen austenitic stainless steel gas-shielded flux-cored wire and a preparation method thereof, and belongs to the technical field of welding materials and welding material manufacturing processes. The technical problem that when high-nitrogen low-nickel austenitic stainless steel is welded at present, the low-temperature impact toughness of a welding joint is not high is solved. The flux-cored wire is prepared from flux core powder and a stainless steel skin wrapping around the flux core powder, the flux core powder is formed by mixing rutile, potassium feldspar, zircon sand, fluorite, cryolite, copper powder, aluminum-iron alloy, electrolytic manganese, atomized ferrosilicon, silicon-calcium alloy, metal nickel, ferromolybdenum, ferrocolumbium, ferrotitanium and nitrided metal chromium. the method comprises the following steps that the mineral powder is dried in batches and mixed with the dried alloy powder, then the outer skin is filled with the mixture, rolling and drawing diameter reducing are conducted, and the flux-cored wire is obtained. According to the nickel-saving high-nitrogen austenitic stainless steel gas-shielded flux-cored wire and the preparation method thereof, the welding wire is excellent in low-temperature mechanical property.

The invention discloses a preparation method of energy-saving moisture-absorption-resisting xylooligosaccharide powder. The preparation method comprises the following steps of: (1) taking an xylooligosaccharide solution, adding active carbon, stirring and decolorizing, filtering after the decolorizing, so as to obtain a decolorizing solution, and adding de-ionized water in the decolorizing solution, so as to obtain the xylooligosaccharide solution after passing through resin for purifying; (2) placing the xylooligosaccharide solution into an evaporator, so as to obtain an xylooligosaccharide concentrated solution; and (3) throwing the xylooligosaccharide concentrated solution into a vacuum belt drier for dry, and then milling, so as to obtain the moisture-absorption-resisting xylooligosaccharide powder. The preparation method provided by the invention comprises the advantages that (1) the process is simple, and the operation and the adjustment are convenient; (2) the moisture absorption resisting capability of the obtained product is high, the storage and the transportation are convenient, and the relatively good flowing property is kept; (3) the intelligent degree of automatization is high, the labour is saved, and the labour intensity is reduced; and (4) the energy consumption is low, and the cost is low.

The invention relates to the technical field of the making of sugar, and particularly discloses a preparation method of high-quality syrup and powdered sugar. According to the preparation method of the high-quality syrup and powdered sugar, raw sugar is used as a raw material. The preparation method is characterized by comprising the following steps of dissolving the raw sugar by using water, so as to obtain raw-sugar syrup, introducing lime milk and the raw-sugar syrup together into a purification system, slowly introducing carbon dioxide into the purification system to carry out carbonation, making carbonated syrup enter a filtration system, and making the carbonated syrup first enter a clarifier and then pass through a hyperfiltration membrane, so as to finally obtain clear juice; subjecting the clear juice to discoloration, desalination and condensation treatment in sequence, so as to obtain target syrup; carrying out spray drying on the desalinated clear juice, so as to obtain the powdered sugar, cooling the powdered sugar, and then compounding the powdered sugar, so as to obtain a final product. The preparation method has the characteristics that the operation is simple (crystallization, evaporation and dissolution are not needed); the energy consumption is low; the cost is low; the product quality is stable and favorable.