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994results about How to "Prevent precipitation" patented technology

Solar water evaporation purification and decomposition device

The invention discloses a solar water evaporation purification and decomposition device which comprises a water supply line, a float and heat insulation layer, an evaporation layer and a photothermalconversion and solute barrier layer which are connected in sequence from bottom to top. The water supply line enables water to pass through the float and heat insulation layer, and the water is pumpedinto the evaporation layer by virtue of a capillary action; solar energy absorbed by the photothermal conversion and solute barrier layer is converted into heat, and water is heated to be vaporized into water vapor from the evaporation layer; due to pore channel volatilization of the photothermal conversion and solute barrier layer, partial water vapor is decomposed to produce hydrogen and oxygen; since the photothermal conversion and solute barrier layer contains a hydrophobic part and is not infiltrated by water, the solar energy can directly heat a heat-absorbing material only, but not heat water, so that high photothermal conversion efficiency is realized; and meanwhile, the solute in the water is prevented from being separated out on the membrane, and sea water desalination, sewage purification and water decomposition can be realized. Due to the design of a hydrophilic/hydrophobic double-layer evaporation structure, the solar water evaporation purification and decomposition device with high photothermal conversion efficiency and high stability is obtained.
Owner:XI AN JIAOTONG UNIV

Aqueous dull finishing coat, preparation method and use method thereof

The invention relates to an aqueous dull finishing coat with scratch resistance, a preparation method and a use method thereof. Main varnish is prepared from the following components in parts by weight: 60-80 parts of acrylic acid emulsion, 0.5-3 parts of thickening agent, 0.1-1.0 part of defoaming agent, 5-10 parts of glass powder, 0.1-1.0 part of foam inhibitor, 3-8 parts of filming auxiliary agent, 0.1-1.0 part of dispersant, 0.1-0.5 part of wetting agent, 1.0-3.0 parts of extinction powder, 0.5-3.0 parts of wax pulp and 1-20 parts of water; a curing agent of the aqueous dull finishing coat is mixed by 80 parts by weight of aliphatic polyisocyanate and 20 parts by weight of propylene glycol methyl ether acetate; and the ratio of curing agent NCO to main varnish OH is 2.5. The main varnish is prepared by the steps of adding the acrylic acid emulsion into a container, adding the thickening agent, the defoaming agent, the foam inhibitor and the dispersant under stirring, and dispersing at 500RPM for 5-8 minutes till being uniform; afterwards, after adding the extinction powder, the glass powder and the wax pulp under stirring, dispersing at 1000RPM for 15 minutes till the fineness is not more than 25mum; and then, adding the wetting agent, the filming auxiliary agent and the water, dispersing at 500RPM for 10 minutes till being uniform and filtering by a sieve with 100 meshes so as to obtain the aqueous dull finishing coat. The aqueous dull finishing coat is used by mixing in the weight mixture ratio of the main varnish to the curing agent to tap water being 100:50:20. A varnish film has very good hardness, toughness, scratch resistance, abrasion resistance and weather resistance, can be recoated without blanching and has especially good chemical resistance.
Owner:SHENZHEN GRANDLAND ENVIRONMENTAL COATING CO LTD

Rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel and preparation method thereof

ActiveCN104328353ARefining solidified tissueImprove performanceSolution treatmentMartensitic stainless steel
The invention discloses rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel is characterized by comprising the following chemical components in percentage by weight: less than or equal to 0.07% of C, less than or equal to 1% of Si, less than or equal to 1% of Mn, less than or equal to 0.035% of P, less than or equal to 0.03% of S, 3.00-5.00% of Ni, 15.5-17.5% of Cr, 3.00-5.00% of Cu, 0.15-0.45% of Nb, 0.05-0.25% of Re and the balance of Fe and belongs to the field of alloy steels. The invention also discloses a preparation method of the rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The preparation method comprises the steps of smelting, casting, carrying out electroslag remelting, casting ingots, forging or rolling, carrying out solution treatment and the like. The rare-earth-type 0Cr17Ni4Cu4Nb special steel, which is disclosed by the invention, as one of precipitation-hardening martensitic stainless steel, has the characteristics of high strength, high hardness, corrosion resistance and the like and is suitable for various technical fields, such as chemical machinery, food machinery, papermaking machinery, aerospace and marine.
Owner:什邡新工金属材料有限公司
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