38results about How to "Improve coating appearance" patented technology

The invention belongs to the technical field of surface treatment and particularly relates to a neodymium iron boron rare earth permanent magnet surface anti-corrosion coating and a preparation method thereof. The neodymium iron boron rare earth permanent magnet surface anti-corrosion coating is composed of a bottom coating and a top coating, the thickness of the bottom coating is in a range from 10mum to 25mum, the chemical components of the bottom coating comprise 55% to 65% of one or two types of metals of zinc and aluminum, 0% to 5% of one or a plurality of types of metals of nickel, chromium, molybdenum, neodymium, praseodymium, cobalt and titanium and 34% to 40% of neutral resins, the thickness of the top coating is in a range from 5mum to 15mum, and the chemical components of the top coating comprise 55% to 65% of one or a plurality of types of metals of zinc, aluminum, titanium, molybdenum, nickel, cobalt and chromium and 35% to 45% of phenolic resins or acrylic resins. The preparation method includes that firstly the surface of a permanent magnet is preprocessed, a centrifugal immersion tossing is utilized to prepare the bottom coating, and a rolling spraying process is utilized to prepare the top coating. The neodymium iron boron rare earth permanent magnet surface anti-corrosion coating and the preparation method thereof have the advantages that by means of double layers of coatings, the corrosion resistance is high, the surface binding force is high, the usage temperature is higher than 200 DEG C, the magnetic property of the neodymium iron boron rare earth permanent magnet is improved, the service life is prolonged, and the service environment is widened.

There is provided a hot-dip Al—Zn coated steel sheet that has a steel sheet containing Si and Mn as a base steel sheet and has excellent coating appearance and corrosion resistance. The Al—Zn coating layer has an Al content in the range of 20% to 95% by mass. The Al—Zn coating layer has a Ca content in the range of 0.01% to 10% by mass. Alternatively, the Ca and Mg content is in the range of 0.01% to 10% by mass. A steel sheet surface layer within 100 μm from a surface of the base steel sheet directly under the Al—Zn coating layer contains less than 0.060 g/m² per surface of an oxide of at least one selected from Fe, Si, Mn, Al, P, B, Nb, Ti, Cr, Mo, Cu, and Ni in total.

The present invention relates to a dispersion comprising an acryl-modified cellulose ester derivative (D) dispersed in an aqueous medium, wherein a hydrophobic acrylic resin (B) and a hydrophilic acrylic resin (C) are grafted onto a cellulose ester derivative (A) in the acryl-modified cellulose ester derivative (D). The dispersion has excellent long-term storage stability, and aqueous coating compositions comprising the dispersion can form coating films with excellent coating workability, solvent resistance, chemical resistance, water resistance, and excellent curability.

The present invention provides polyamide curing agent compositions comprising the reaction products of (1) multifunctional amines of structure 1

where R₁ is CH2CH2CH2NH2; R₂, R₃ and R₄ independently are H or CH2CH2CH2NH2, and X is CH2CH2 or CH2CH2CH2 with (2) dimer fatty acids, optionally in combination with monofunctional fatty acids, the reaction product preferably comprising at least 15 wt % tetrahydropyrimidine-containing components. The curing agent compositions are useful for crosslinking epoxy resins to produce coatings, adhesives, floorings, composites and other articles.

The invention discloses a food-grade powder coating as well as a preparation method and application thereof. The powder coating comprises modified phenolic epoxy resin, a phenolic curing agent and anaid. The powder coating has the properties of high corrosion resistance, strong impact resistance, low curing temperature, short curing time, good adhesion force, excellent coating appearance and thelike, can meet the food-grade health and safety requirements and is particularly suitable for the protection of water-related workpieces or containers such as water pipes, valves and water faucets andthe like for drinking water or groundwater.

A method for manufacturing a high strength galvanized steel sheet and a high strength galvanized steel sheet are provided. A base steel sheet having a chemical composition comprising C: 0.03% to 0.35%, Si: 0.01% to 0.50%, Mn: 3.6% to 8.0%, Al: 0.001% to 1.000%, P≦0.10%, S≦0.010%, and the balance comprising Fe and incidental impurities, on a percent by mass basis, is subjected to annealing and galvanization treatment, wherein the maximum steel sheet temperature in an annealing furnace is 600° C. or higher and 700° C. or lower, the steel sheet transit time in a temperature region of the maximum steel sheet temperature of 600° C. or higher and 700° C. or lower is specified to be 30 seconds or more and 10 minutes or less, and the dew point in an atmosphere is specified to be −45° C. or lower.

There is provided a hot-dip Al—Zn coated steel sheet that has a steel sheet containing Si and Mn as a base steel sheet and has excellent coating appearance and corrosion resistance. The Al—Zn coating layer has an Al content in the range of 20% to 95% by mass. The Al—Zn coating layer has a Ca content in the range of 0.01% to 10% by mass. Alternatively, the Ca and Mg content is in the range of 0.01% to 10% by mass. A steel sheet surface layer within 100 μm from a surface of the base steel sheet directly under the Al—Zn coating layer contains 0.06 to 1.0 g/m² per surface of an oxide of at least one selected from Fe, Si, Mn, Al, P, B, Nb, Ti, Cr, Mo, Cu, and Ni in total.

Provided are a method for controlling a dew point in a reducing furnace and a reducing furnace in which, even in the case of galvanizing Si-added steel, coating adhesion can be secured, alloying treatment can be performed without increasing the alloying temperature excessively, and it is possible to obtain a hot-dip galvanized steel sheet having an excellent coating appearance. When a steel sheet is subjected to annealing and hot-dip galvanizing treatment using continuous hot-dip galvanizing equipment including at least a radiant tube-type reducing furnace, a mixed gas of a dry gas and a humidified gas by a humidifying device having a water vapor permeable membrane is used as a gas to be supplied into the reducing furnace. The mixed gas is supplied into the reducing furnace, thereby controlling the dew point in the reducing furnace.

The invention provides an aqueous epoxy zinc-enriched antirust priming paint for railway steel bridges and a preparation method thereof, and relates to the technical field of paints. The priming paintcomprises a component (a) and a component (b) according to a mass ratio of 1:4. The component (a) is prepared from following raw materials: aqueous epoxy resin emulsion, graphene coated glass fibers,nano antimony doped tin dioxide, nano titanium dioxide, an epoxy silane coupling agent, n-butyl alcohol, propylene glycol mono-methyl ether, an antifoaming agent (A), and deionized water; and the component (b) is prepared from following raw materials: a cardanol modified polyamide curing agent, zinc powder, a filling material, a thixotropic agent, an antifoaming agent (B), a dispersant, a flush-rust resistant agent, and a mixed solvent. By adding graphene coated glass fibers and nano antimony doped tin dioxide into the paint, the prepared epoxy zinc-enriched antirust priming paint has an excellent corrosion resistant performance, a strong adhesion force, and good weatherability even if the zinc powder content is low.

The invention discloses acrylic resin with high solid content, weather resistance and appearance, which is characterized in that the acrylic resin comprises monomers, an initiator, a crosslinking accelerator, a catalyst and an organic solvent as raw materials through polymerization reaction in a micro-channel reactor, wherein the monomer comprises styrene, acrylic acid, hydroxymethyl acrylamide, glycidyl methacrylate, 4-tert-butyl benzoic acid glycidyl ester, diethanol amine and at least three of the following acrylate: butyl acrylate, butyl methacrylate, isobutyl methacrylate, isobornyl methacrylate and hydroxyethyl methacrylate. The method has the advantages of high transfer rate, short contact time, few byproducts, higher conversion rate, good operability, high safety, rapid and directamplification and the like, and the obtained acrylic resin has the characteristics of high solid content, high weather resistance and high appearance, and is particularly suitable for production of high-quality coatings.

The present invention provides a modifying agent for resins for paints or resins for inks, containing fatty acids obtained by the enzymatic decomposition of vegetable oils or fats, the resins for paints or resins for inks modified with the modifying agent, and a paint or ink composition containing the resin for the paint or resin for the ink. The paint or ink composition of the present invention has electrodeposition potential or UV curing property and is excellent in the appearance of the paint film, finishing sharpness and adhesion.

The invention relates to powder coating compositions suitable for low temperature powder coating crosslinking typically at curing temperature is between 75 and 140° C. which can be used for powder coating temperature-sensitive substrates like MDF, wood, plastic or temperature sensitive metal alloys.

The invention discloses an expandable type building fireproof coating and a preparation method thereof. The preparation method comprises the following steps: weighting unsaturated polyester resin andthen adding into a stirring reaction kettle; adding styrene, methyl ethyl ketone peroxide, cobalt naphthenate and liquid paraffin into the reaction kettle in turn while stirring, and then reacting while stirring for 20-40min; weighting expandable graphite, ammonium polyphosphate, pentaerythritol and melamine and then adding into a grinding mill for grinding; weighting filler and then adding into the grinding mill for grinding; pouring the filler and the mixture of ammonium polyphosphate, pentaerythritol and melamine into the stirring reaction kettle, and quickly stirring and mixing for 30-60min; adding auxiliaries and solvent, and then stirring and mixing again. According to the invention, different modified resins are stirred and mixed at different ratios, so that the fireproof time of the coating is prolonged, and meanwhile, the fireproof coating has anti-ultraviolet, antibacterial, sterilizing and anticorrosion effects, and the service life of the coating is prolonged.

An object of the present invention relates to provide a method for forming a multi-layered coating film including a step of baking and curing an uncured intermediate coating film, an uncured base coating film and an uncured clear coating film at the same time which can give a multi-layered coating film excellent in gloss and in appearance, and to provide a multi-layered coating film obtained thereof.

The present invention provides to a method for forming a multi-layered coating film in three-coat and one-bake coating method, using a solvent-borne intermediate coating composition containing an urethane-modified polyester resin (a) having a water tolerance value of 4 to 10 ml, a melamine resin (b) having a hexane tolerance value of 8 to 40 ml, a blocked isocyanate compound (c) and a nonaqueous dispersion resin (d), and a water-borne base coating composition containing an emulsion resin and a pigment.