4results about How to "Avoid crack defects" patented technology

The application discloses an inorganic copolymer anticorrosive paint and a preparation method thereof, and relates to the technical field of paints. The inorganic copolymer anticorrosive paint comprises the following raw materials in parts by weight: 20-30 parts of silica sol, 8-15 parts of sodium hydroxide, 30-45 parts of metakaolin, 8-20 parts of quartz sand, 15-25 parts of water, 0.3-2 parts of sodium polyacrylate, 0.2-3 parts of polydimethylsiloxane emulsion, 5-12 parts of modified nanometer titanium dioxide, 6-10 parts of modified epoxy resin, 10-25 parts of hydroxyethyl methacrylate, 5-10 parts of zinc phosphate, 3-8 parts of aluminum tripolyphosphate and 2-6 parts of red iron oxide. The inorganic copolymer anticorrosive paint has scientific raw material proportioning, and the anticorrosive performance is enhanced through the modified nanometer titanium dioxide and the epoxy resin. In the preparation, step-by-step feeding and ultrasonic dispersion are adopted to ensure that the materials are uniform, and vacuum degassing and nitrogen protection are adopted to improve the stability. The silica sol, the zinc phosphate and other components have a synergistic effect, a dense coating is formed, the anticorrosive performance is high, the construction performance is good, and the inorganic copolymer anticorrosive paint is suitable for various scenes.

This invention discloses a method for processing a self-locking nut for a titanium alloy pallet, belonging to the technical field of titanium alloy pallet nuts. The method includes: Step 100, blanking; Step 200, hot upsetting one end of the bar stock multiple times to obtain a pallet disc, yielding semi-finished product A; Step 300, solution heat treatment of semi-finished product A; Step 400, tapping threads on the inner wall of the threaded bottom hole using a spiral flute tap, yielding semi-finished product B; Step 500, machining the outer shape of the nut body section; Step 600, stamping the pallet disc to form two pallets, yielding semi-finished product D; Step 700, machining a closing groove, yielding semi-finished product E; Step 800, aging treatment of semi-finished product E; Step 900, surface treatment of semi-finished product E, yielding the finished product. Multiple hot upsetting of one end of the bar stock effectively avoids folding and cracking defects in the blank. Using a spiral flute tap ensures that the thread processing quality and surface finish meet quality requirements.

The present application relates to polyvinyl chloride pipe manufacturing technology field, disclose a kind of modified PVC power cable protection pipe, including polyvinyl chloride resin, heat stabilizer, pentaerythritol, stearic acid, calcium carbonate, polyolefin alloy ionomer masterbatch and liquid complexing agent.Polyolefin alloy ionomer masterbatch is composed of octene-1 and ethylene copolymer, high-density polyethylene, maleic anhydride grafted polyolefin elastomer and active zinc oxide.Liquid complexing agent is composed of isopropyl tri (dioctyl pyrophosphoric acyloxy) titanate and epoxy soybean oil.Polyvinyl chloride dry mix and polyolefin alloy ionomer masterbatch are melt extruded when preparing, and liquid complexing agent is injected laterally.The present application forms toughening phase by polyolefin alloy ionomer masterbatch to absorb and disperse impact stress, and liquid complexing agent improves compatibility of formula raw materials.Lateral injection process promotes liquid complexing agent to directly act on mixed interface, and improves the compactness of modified PVC power cable protection pipe.

The invention discloses a method for producing H08A semi-killed low-silicon welding rod steel by adopting a small square billet process, and belongs to the technical field of ferrous metallurgy. The method comprises the four procedures of converter smelting, LF refining, continuous casting and rolling, by optimizing the technological parameters of all the procedures, precise control over the silicon content and effective removal of inclusions are achieved, and the product quality stability is improved; the sulfur content and the phosphorus content are both smaller than or equal to 0.030%, the inclusion rating is smaller than or equal to 1.5 grade, and the purity of the welding rod steel is improved; the silicon mass fraction is stabilized at 0.03-0.07%, and the problem that the welding performance is poor due to the fact that the silicon content in a traditional process exceeds the standard is solved.