44results about How to "Reduce devitrification" patented technology

An apparatus and methods for making a glass ribbon includes a forming wedge with a pair of inclined forming surface portions converging along a downstream direction to form a root. The apparatus further includes an edge director intersecting with at least one of the pair of downwardly inclined forming surface portions, and a replaceable heating cartridge configured to direct heat to the edge director and thermally shield the edge director from heat loss. A replaceable heating cartridge is also provided for directing heat to the edge director and thermally shielding the edge director from heat loss.

The invention discloses a preparation method of a high-imido and high-methoxylation melamine resin capable of being cured at low temperature. According to the method, the high-imido and high-methoxylation melamine resin capable of being cured at low temperature is obtained by reacting melamine, a formaldehyde solution and methanol, paraformaldehyde is not required to be added, the step of synthesis of hydroxymethylation melamine as an intermediate product is omitted, preparation costs are reduced, links of crystallization, drying and the like of the intermediate product are omitted, energy consumption is low, a technological process is simple, the methanol only needs to be added at one step in reaction, and the preparation method is easy to control. In addition, a mixture of hydrochloric acid and formic acid is used as an etherification catalyst, and the effect of the obtained product is better than that of a single acid catalyst.

A refractive index distribution type optical element has a core/cladding structure produced with the ion exchange method. The element includes colorant of metal oxides in cladding glass thereof. The cladding glass consists of base glass and the colorant of the metal oxides comprising: 0.3 to 4.0 wt. % CoO; 1.0 to 12.0 wt. % Fe2O3; 0.0 to 2.0 wt. % NiO; and 0.0 to 0.2 wt. % Cr2O3 when the total amount of the base glass except for the colorants is taken as 100 wt. %. The refractive index distribution type optical element is prevented from deterioration of the optical properties occurring at portions having the refractive index departing the regular parabolic distribution and also is prevented from entrance of the flare light. The element is provided with good resolution even when employed for an optical device using a white light, and a rod lens array formed with the refractive index distribution type optical element is provided.

The invention discloses a purification method for quartz sand. The purification method comprises the following steps: crushing raw quartz ore, adding water, carrying out blending, then adding a grinding aid and successively carrying out ball milling, magnetic separation and drying so as to obtain a material A; subjecting the material A to heating, heat preservation, chlorination water and quenching and then carrying out filtering and drying so as to obtain a material B; and adding the material B into a mixed acid solution, carrying out ultrasonic treatment at 35 to 65 DEG C for 3 to 8 h and then successively carrying out filtering, washing until a pH value is 7, and drying so as to obtain purified quartz sand. The purification method for quartz sand is simple in steps, and the obtained quartz sand is high in purity and good in stability and can be applied to a plurality of fields.

The invention discloses superfine lead-free glass powder for the electrode slurry of a solar battery and a preparation method thereof. Lead-free glass comprises 20% to 30% of SiO2, 40% to 70% of Bi2O3, 2% to 15% of B2O3, 1% to 10% of Sb2O3, 1 to 3% of ZnO and 1 to 3% of ZrO2. The preparation method comprises the following steps: (1) weighing of a mixture according to the above-mentioned proportion and addition of a pore forming agent (C and PVA); (2) melting of the mixture; (3) water quenching; and (4) planetary ball milling (sieving). The superfine glass powder is prepared through ball milling of environment-friendly lead-free porous glass powder by using this method; and compared with conventional products, the prepared lead-free superfine glass powder has the advantages of short ball milling time, low energy consumption, a small particle size and high activity. A high photoelectric conversion rate is obtained when the lead-free superfine glass powder is used for photovoltaic positive electrode slurry; after electrode silver slurry is sintered, low volume resistance is obtained, bonding strength between an electrode silver layer and Si is improved, and sintering temperature of silver slurry is reduced.

The invention discloses a glass microballoon manufacturing device comprising a furnace body (1) and a waste gas treatment device, wherein the furnace body (1) is formed by air-tight connection of an upper part and a lower part, the upper part of the furnace body is of a cubic shape, a waste gas emission port (4) is arranged at the top of the upper part, one or more injection-type burners (2) are horizontally installed on the side of the upper part, a preheating air pipe (14) is arranged in the upper part, the lower part of the furnace body is of a square conical shape, and one or more microballoon collectors (3) are arranged at the bottom of the lower part. According to the glass microballoon manufacturing device and the preparation method thereof provided by the invention, the furnace body which adopts the cubic structure enlarges the cooling space; the horizontally installed injection-type burners and the preheating air pipe arranged in the furnace body can give full play to the heat value of fuel, thus reducing energy source waste, saving energy and reducing emission; TiO2 and Al2O3 with relatively lower costs are adopted, the refractive index of the product is greater than or equal to 1.93; and the glass microballoon manufacturing device and the preparation method thereof have the advantages of reducing devitrification, improving the cooling velocity, having good product quality, improving the utilization ratio of raw material, being capable of large-scale production, and the like.

A glass tube for lamp includes: a tubular glass section having open ends; and a ceramics film that covers at least a portion of an inner surface of the glass section in an area that forms a light emission section of the lamp.

Fluoride glass and a preparing method thereof are disclosed. The fluoride glass includes, in mole percentages, 16-70% of ZrF4, 13-32% of BaF2, 5-18% of MF, 0-14% of MeF2 and 0-28% of MfF3, wherein the M is one or two selected from Na and Li, the Me is one or more selected from Zn, Mg and Ca, and the Mf is one or two selected from Al and La. The fluoride glass has a low cost and is suitable for applications in optical windows of near ultraviolet to middle-infrared wavebands. The cutoff wavelength of the prepared glass is greater than 6 [mu]m. The glass has good glass forming capacity, and is suitable for preparing matrix glass of infrared laser fibers and fiber optic amplifiers and other optical materials. The glass has good glass forming capacity, good chemical stability, and low theoretical loss and is suitable for preparing matrixes of low-loss fluoride fibers and doped fibers.

The invention discloses a system and a method for low-temperature charging management of an electric automobile. The system for low-temperature charging management of the electric vehicle comprises atemperature obtaining module which is used for obtaining the temperature of a battery and the power of a charging pile in real time, a comparison module which is used for comparing the acquired battery temperature with a temperature threshold value, and a distribution module which is used for performing priority distribution on high-voltage accessories according to the comparison result and the battery temperature and the charging pile power. The low-temperature charging speed is increased, and the battery is protected.

The invention provides improved near infrared ray filter glass which comprises a glass substrate with the thickness of 0.19 mm-0.4 mm. The center wavelength of the glass substrate is in a range of 640 nm-650 nm; the glass substrate comprises, by the molar percentage, 35%-45% of Al(PO3)3, 10%-25% of P2O5, 3%-7% of SrO and 6%-15% of CuO. The improved near infrared ray filter glass has excellent chemical stability and high penetration rate, has the molding temperature reduced, and can be resistant to severe high temperature and high humidity environments.

The invention discloses a compound type liquid anti-freezing pumping agent and a preparation method thereof. The compound type liquid anti-freezing pumping agent is prepared from the following components in parts by mass: (30 to 35) parts of a polycarboxylic type high efficiency water-reducing agent, (5 to 6) parts of alkyl succinimide, (2 to 3) parts of dioctyl phthalate, (1.5 to 2) parts of sodium gluconate, (8 to 10) parts of magnesium acetate, (0.3 to 0.4) part of sodium dodecylbenzene sulfonate, (1.3 to 1.5) parts of isopropyl alcohol, (1 to 1.5) parts of fragilaria crotonensis anti-freezing protein, (0.005 to 0.007) part of polyethylene glycol, (0.0025 to 0.003) part of beta-cyclodextrin, (0.0075 to 0.008) part of dimethyl diallyl ammonium chloride and (45 to 50) parts of water. Theanti-freezing pumping agent has small crystallization amount at low temperature, high cohesive force, relatively small slump loss and no pollution and the preparation method is simple.

The invention discloses a low dielectric sealing glass granulation powder and a preparation method thereof, the sealing glass comprises the following components by mole percentage based on oxide: 68.2% to 72.3% of SiO2, 20.7% to 24.8% of B2O3, 1% to 2% of Al2O3, 2% to 3% of Na2O, 0.5% to 1% of K2O, 0.5% to 1% of CaO, and 0.5% to 1% of Bi2O3. The preparation method comprises the following steps: uniformly mixing the raw materials corresponding to the components, melting at 1600-1650 DEG C, quenching to obtain glass slag, carrying out ball milling on the glass slag, pulping, and carrying out spray granulation to obtain granulation powder with certain particle size and sphericity. And preparing the granulated powder into a glass blank with a required shape by compression molding, and placing the glass blank at a certain temperature for glue removal and vitrification to obtain the prefabricated glass bead for sealing. The sealing glass prepared by the method is relatively low in high-temperature viscosity after being melted, and glass residues are easy to recover; and meanwhile, the granulation powder has better sphericity and flowability, and the formed glass blank is transparent and white after glue removal and vitrification. Meanwhile, the dielectric constant and dielectric loss of the sealing glass are small, the dielectric constant is 3.9-4.2 under the frequency of 1 MHz, the dielectric loss is 1 * 10 <-3 >-4 * 10 <-3 >, and the sealing temperature is 840-900 DEG C.

The invention discloses a glass kiln clarification part pool bottom structure convenient for discharging in the technical field of glass kiln pool bottom structures. The glass kiln clarification part pool bottom structure comprises: a pool bottom layer, wherein a discharging opening is formed in the pool bottom layer, and a first slope pavement layer arranged on the pool bottom layer in the length direction of the pool bottom layer, wherein the slope surface of the first slope pavement layer faces the discharging opening, so that the inferior molten glass at the pool bottom of the clarification part flows to the discharging opening. According to the invention, the first slope pavement layer and the discharging opening are arranged on the pool bottom layer of the clarification part, and the inferior molten glass at the pool bottom is drained through the slope surface, facing the discharge port, of the first slope pavement layer, so that the inferior molten glass is gathered at the discharging opening and discharged.

The invention discloses high-refractive-index watch glass for a watch outer cover and a production process of the high-refractive-index watch glass. The high-refractive-index watch glass is prepared from silicon dioxide, aluminum oxide, borax, calcium carbonate, zinc oxide, dolomite, sodium carbonate, a clarifying agent and an initiator. The mass percentage of each component is as follows: 20-30%of silicon dioxide, 15-25% of aluminum oxide, 15-25% of borax, 10-20% of calcium carbonate, 2-4% of zinc oxide, 10-20% of dolomite, 1-3% of sodium carbonate, 5-10% of a clarifying agent and 2-5% of aninitiator. The glass is safe and reliable, silicon dioxide, aluminum oxide, borax, calcium carbonate, zinc oxide and dolomite are adopted as raw materials and subjected to dissolving processing and then compression molding, the glass crystallization phenomenon is reduced, the stability and strength of the watch glass are improved, the glass absorbs short-wavelength rays, the refractive index anddispersion of the watch glass are improved, the process is simple and rigorous, the raw materials are cheap, and the cost is low; machining is convenient, the production cost is greatly saved, and machining and production are facilitated.

The invention discloses lead-free colored glass and its melting process. The glass is composed of the following raw material components: SiO2, B2O3, BaO, MgO, Na2O, Al2O3 and colorant; the melting steps of the glass are as follows: 1), select raw materials, mix raw materials according to the weight percentage, 2), microwave the mixed raw materials, and after heat treatment, obtain luminous glass; Disadvantages of discoloration and darkening under high-energy radiation, reducing ultraviolet radiation, no crystallization during glass production, stable luminous performance, energy saving in microwave melting process, and easy control of melting process parameters.