55results about How to "Reduce flow marks" patented technology

Disclosed is an online auction method and system for establishing a bidding reward mechanism. According to the bidding reward mechanism, a consignor commissions an auctioneer to reward a bidder so that the bidder enjoys part of price differences in bidding steps; meanwhile, during auctions, each time when the bidder bids, an auction platform freezes a margin of same amount or certain proportion of amount, the margin is not unfrozen until that another bidder bids, and flowing steps are alike. The online auction method and system is transparent and strict, safe and reliable, and open and fair, activates the auction market and serves the public and economy.

The invention relates to an appearance-improving spraying-free aesthetic resin and its preparation method. The resin comprises the following components by weight part: 90 of matrix resin, 0.1-2.0 of a lubricant, 0.1-1.0 of an antioxidant, and 10-30 of a magnetic metallic pigment masterbatch, which consists of the following components by weight part: 100 of the matrix resin, 1.0-20 of a magnetic metallic pigment, 1.0-30 of a pearlescent pigment, 0.1-2.0 of the lubricant, 0.1-1.0 of the antioxidant. The preparation method includes: preparing the magnetic metallic pigment masterbatch; and mixingthe above raw materials, then conducting mixing, extrusion, bracing, cooling, and pelletizing, thus obtaining the aesthetic resin. The aesthetic resin of the invention can effectively improve the affinity of an aluminum powder pigment and a plastic substrate, mitigate flow marks and weld lines that appear during injection molding or extrusion of aluminum powder pigment-containing aesthetic resin,and simultaneously strengthens the metal effect a made piece, greatly reduces consumption of the aluminum powder pigment, and saves cost. The present invention is green and environmental aesthetics resin instead of traditional paint scheme provides technical support. The aesthetic resin and the preparation method provided in the invention provide technical support for green and environmentally friendly aesthetic resin to substitute traditional paint spraying schemes.

The invention relates to a water-based paint of lost foam for iron casting. The water-based paint is characterized by comprising the following raw materials: high bauxite, precious peal powder, brown aluminum oxide, sodium bentonite, polyacrylamide, a polyvinyl acetate emulsion, maltodextrin, silica sol, sodium hexametaphosphate, tributyl phosphate, sodium pentachlorophenate, OP-10 active agent and water. A production method of the water-based paint comprises the steps: pretreating the sodium bentonite, pretreating the polyacrylamide and the maltodextrin, adding the water, the sodium pentachlorophenate, the tributyl phosphate and the sodium hexametaphosphate into a high-speed dispersion kettle, stirring and then sequentially adding the sodium bentonite slurry and a polyacrylamide and maltodextrin pretreatment solution into the dispersion kettle, sequentially adding the polyvinyl acetate emulsion and the silica sol into the dispersion kettle, sequentially adding the OP-10, the high bauxite, the precious pearl powder and the brown aluminum oxide to the dispersion kettle under a stirring state, and conducting high-speed dispersion for 30 minutes after completing the feeding. The water-based paint is unique in the raw materials, environment-friendly, high in coating strength, anti-cracking, good in permeability, and free from carbon lack of castings.

A method for preparing a coating-free aesthetic resin with improved appearance comprises the following steps of: (1) blending the matrix resin, an antioxidant, a lubricant and an aluminum powder pigment together in a weight ratio of 100: (0.1-1): (0.5-2): (0.1-2); (2) stirring and mixing the raw materials in a high-speed mixer and then feeding the mixture into a double-screw extruder, melting and compounding the mixture under conveying, shearing and mixing of the screws, and then performing extrusion, bar drawing, cooling and grain-sized dicing through an opening mold assembled with an ultrasonic device, thereby obtaining the coating-free aesthetic resin with improved appearance. Compared with the prior art, the ultrasonic extrusion method is employed so that the compatibility of the polyester matrix resin with the aluminum powder is improved and the processability of the matrix resin is improved; as a result, weld lines and flow marks of the aesthetic resin formed in the injection molding process are greatly reduced. The method provided by the invention provides technical support for replacing the traditional painting proposal by the green environment-friendly aesthetic resin.

The invention relates to a spraying-free aesthetic resin composition with magnetism. The resin comprises the following components in parts by weight: 70-90 parts of matrix resin, 0.1-2.0 parts of lubricant, 0.1-1.0 part of antioxidant and 10-30 parts of magnetic metallic pigment master batch. The magnetic metallic pigment master batch comprises the following components in parts by weight: 100 parts of matrix resin, 1.0-20 parts of magnetic metallic pigment, 1.0-30 parts of pearlescent pigment, 1.0-2.0 parts of lubricant and 0.1-0.3 parts of antioxidant. The preparation method comprises the steps of preparing the magnetic metallic pigment master batch; agitating and mixing the raw materials, extruding, drawing into bars, cooling and cutting into grains to obtain the spraying-free aesthetic resin composition. The spraying-free aesthetic resin composition with magnetism has the advantages that the flow marks and the weld lines occurring in the injection molding or extrusion process of the aesthetic resin containing aluminum powder pigment are effectively reduced, the metal effect of produced parts is enhanced at the same time, the amount of the used aluminum powder pigment is reduced and the cost is saved.

The invention relates to a spray-coating-free scratch-resistant PP alloy material and a preparation method thereof, wherein the spray-coating-free scratch-resistant PP alloy material is prepared from the following raw materials by weight: 100 parts of polypropylene, 5-20 parts of an transparent ionic polymer, 3-6 parts of a compatibilizer, 0.5-3 parts of a metal powder pigment, 0.5-1 part of a dispersant, 0.5-1 part of an infiltrating agent, and 0.2-0.5 part of an antioxidant, the dispersant is formed by compounding polyester grafted modified silicone and polyethylene wax according to a weight ratio of 2:1, and the graft ratio of the polyester grafted modified silicone is 0.8-2%. Compared to the material in the prior art, the material of the present invention has advantages of excellent spray-coating-free metal effect, excellent metal effect powder dispersibility and excellent scratch resistance, can effectively alleviate the flow mark problem of the traditional spray-coating-free metal effect material, is suitable for occasions having high scratch resistance requirements, and can be widely used in vehicles, home appliances, and other fields.