63results about How to "No flow marks" patented technology

The invention discloses a scratch-resistant high-gloss spraying-free polypropylene composition with aesthetic effect. The composition comprises the following components by weight percent: 40-94wt% of polypropylene, 0-15wt% of polyethylene, 0-20wt% of elastomer, 0-30wt% of filler, 1-6wt% of a scratch resistant agent system, 2-6wt% of effect pigment, 0.1-2wt% of brightener, and 0-4wt% of a compatilizer. Due to the synergistic effect of the scratch resistant agent system and the effect pigment, the spraying-free product is endowed with more excellent scratch resistance, thus having broader application prospect; in addition, the fluidity of the polypropylene composition is also affected, so that in injection molding or extruding, the change of the space position of the metal pigment of certain appearance shape along with melt flow is limited, the orientation of the metal pigment along with melt flow is reduced or even avoided, the defect of heterochromia of traditional spraying-free product is overcome, and the polypropylene composition has excellent metal texture, has no flow marks, and weakens and even eliminates dark appearance caused by a weld line.

The invention relates to the technical field of 3D printing sand mold casting and in particular to a water based flow coating for a 3D printing sand mold and a preparation method of the water based flow coating. The water based flow coating is prepared from zircon powder, white corundum, high-aluminum fine powder, ferrochrome mineral powder, pyrophyllite powder, sillimanite powder, cyanite powder, andalusite powder, spodumene powder, sodium bentonite, sea-foam stone powder, polyvinyl alcohol, polyvinyl acetate emulsion, phosphate, silica sol, sulfonated dioctyl succinate sodium salt, preservative, a defoaming agent, fluorite, iron oxide red and water. The water based flow coating for the 3D printing sand mold has the advantages of excellent mobility, appropriate permeability, good leveling property, high-efficiency suspension stability, appropriate coating thickness, super strong anti-burn-on property, environment protection, no pollution and high efficiency.

The invention discloses a spraying-free metallic PMMA (polymethyl methacrylate) modified material and a preparation method thereof. The method comprises the steps that the PMMA is used as a matrix resin raw material, MBS (methyl methacrylate), MABS (methyl methacrylate /acrylonitrile/butadiene/styrene/copolymer) and ACR (acrylate copolymer with core-shell structure) are taken as toughening agents, MS (methyl methacrylate/styrene copolymer) is taken as a processing modifying additive, aluminum powder coated with metals and pearlescent pigments which enable materials to be metallic are added, a certain quantity of dispersing agents, a small quantity of antioxidant agents, a lubricating agent, pigments and the like are supplemented, after the materials are uniformly mixed in the proportion, the materials are milled by a parallel double-screw extrusion machine, and a spraying-free metallic PMMA modified material is formed. The material and PVC (polyvinyl chloride) are subjected to compound co-extrusion, so that the surface of the prepared product has an excellent metallic effect; and compared with traditional spraying products, the spraying-free metallic PMMA modified material has the advantages of low cost, environment friendliness, scratch resistance, recycle and the like, therefore, the spraying-free metallic PMMA modified material is particularly suitable for being processed into lateral trim workpieces of refrigerators.

The invention discloses height-adjustable pipe inner wall spraying equipment and belongs to the field of spraying equipment. The height-adjustable pipe inner wall spraying equipment comprises a spraying head, a spraying pipe, a height adjusting device and a walking device, wherein the spraying head is mounted at one end of the spraying pipe and is communicated with the spraying pipe; the height adjusting device comprises a support rod, a connecting bushing and an adjusting screw; the connecting bushing is hollow inside and the side wall of the connecting bushing is provided with a thread hole; one end of the support rod extends into the connecting bushing; the adjusting screw extends into the connecting bushing via the thread hole for propping the support rod on the inner wall of the connecting bushing, and the other end of the support rod is fixedly connected to the part, near the spraying head, of the spraying pipe, and is perpendicular to the spraying pipe; the walking device is mounted at the bottom of the height adjusting device and can drive the spraying pipe to move in the axial direction of a pipe. The spraying equipment has the advantages of stable and reliable operation, good spraying effect, high efficiency and low cost and is suitable for inner walls of various small-diameter pipes, in particular for the inner walls of ultralong small-diameter pipes.

The invention relates to the technical field of evaporative pattern coatings, and in particular relates to a cast iron evaporative pattern coating and a preparation method thereof. The cast iron evaporative pattern coating comprises the following components in parts by weight: 100 parts of refractory aggregate, 2-4 parts of a suspending agent, 1.2-1.6 parts of an adhesive, 0.4-1 part of a thickening agent, 0.5-1.2 parts of a sintering agent, 0.2-0.6 part of an antioxidant and 0.2-0.5 part of an anti-foaming agent, wherein the thickening agent is one or two of sodium carboxymethyl cellulose and xanthan gum; the sintering agent is sodium tripolyphosphate. The coating is good in coating property, a coated layer is free of flow marks or drain marks and good in thermal property and air permeability and is not infiltrated with a molten metal liquid; a cast piece is smooth in surface and free of sand adhesion defect. The preparation method comprises the following steps: uniformly mixing the powder-like components, pouring water into a stirring bucket, pouring the mixed components into the stirring bucket, and stirring for 30-40 minutes by using a stirring machine, wherein the weight of the water accounts for 80% that of the coating. The coating does not need to be prepared for a second time when be used, thus being convenient to use.

The invention relates to the technical field of polymer materials, in particular to a high-gloss spraying-free ABS (acrylonitrile butadiene styrene) composite material with special effect and a preparation method thereof. The composite material comprises, by weight: 70-90 parts of ABS resin, 4.0-10 parts of a compatilizer, 5.0-10 parts of a toughener, 1.0-3.0 parts of white oil, 0.4-0.6 part of a composite antioxidant, 0.5-1.0 part of a lubricant, and 1.0-5 parts of pearl powder. The preparation method is simple, and the prepared ABS composite material has good mechanical properties, low aid emigration rate, significant pearl effect, smooth surface free of flow marks and scratch resistant, and long service life.

The invention discloses a polypropylene composite for a fender as well as a preparation method of the polypropylene composite. The polypropylene composite is prepared from 42-92wt% of polypropylene, 2-5wt% of an oligomer with few flow marks, 1-5wt% of a polar monomer graft olefin polymer, 0-2wt% of a special nucleating agent for polypropylene, 0-4wt% of a processing aid, 0-2wt% of a light stabilizer and 5-40wt% of talcum powder. The preparation method comprises the following steps: melting, mixing and dispersing the polypropylene, the oligomer with few flow marks, the polar monomer graft olefin polymer, the special nucleating agent for polypropylene, the processing aid and the light stabilizer in a double-screw extruder; feeding the talcum powder into the double-screw extruder from one side by an agravic metering balance; and extruding and granulating, thereby finally obtaining the product, namely the polypropylene composite. The polypropylene composite has the characteristics of high rigidity, high gloss and no flow marks and meets the requirements of large-sized polypropylene parts on appearance, and polypropylene injection molded parts have no flow marks.

The invention provides a WPU (Water-soluble Polyurethane) coating applied to a powder-free PVC (Poly Vinyl Chloride) glove. The WPU coating is prepared from the following components in percentage by weight: 15-30 percent of an aqueous polyurethane emulsion, 2-5 percent of flatting silica, 5-10 percent of a substrate wetting agent, 5-10 percent of a thickener, 2-3 percent of a slipping agent and 50-70 percent of deionized water, wherein the sum of the weight percentage of each component is 100 percent. The invention further provides a method for preparing the WPU coating applied to the powder-free PVC glove.

The invention provides a non-antimony flame-retardant polyamide composite material, which comprises the following raw materials in percentage by weight: 20 to 90 percent of polyamide, 5 to 25 percent of halogen flame retardant, 2 to 10 percent of non-antimony flame-retardant synergist, 0.1 to 3 percent of lubricant, 0.1 to 1 percent of antioxidant, 0.3 to 3 percent of surface modifying agent and 1 to 40 percent of enhancement modifying agent, wherein the non-antimony flame-retardant synergist comprises magnesium oxide, silicon dioxide and tin dioxide in a molar ratio of (2-3):(1-2):1. The invention also provides a preparation method for the non-antimony flame-retardant polyamide composite material and application of the non-antimony flame-retardant polyamide composite material. According to the non-antimony flame-retardant polyamide composite material, a comparative tracking index (CTI) value is improved to more than 400 V under the condition of no antimony sesquioxide and zinc borate, the phenomenon of flow marks is avoided, and the production cost is reduced. The non-antimony flame-retardant polyamide composite material can be prepared by the conventional equipment and the conventional method, manufacturing equipment is not needed to be transformed, and industrial production is easy to realize.

The invention relates to a preparation method of a soft-touch polypropylene composite material. The preparation method comprises the steps of preparation of a foaming composition, preparation of polyurethane master batch, preparation of polypropylene resin master batch, mixing of the polyurethane master batch and the polypropylene resin master batch and the like. The foaming agent foams in polyurethane during injection molding so that more elastic holes are formed in the material, and the polypropylene material is endowed with good soft touch due to the elasticity of the polyurethane elastomer; meanwhile, the surface of the injection molding part made of the polypropylene material prepared by the method has no phenomena such as air marks, flow marks and welding marks.

The invention provides a zinc-based multi-element alloy for hot dipping and a preparation method thereof. The zinc-based multi-element alloy comprises the following components in percentage by mass: 2 to 3 percent of Al, 0.1 to 0.2 percent of RE(LA, Ce and PR mixed rare earth), 0.02 to 0.03 percent of Ni, 0.01 to 0.02 percent of Si, 0.01 to 0.02 percent of Mg, 0.005 to 0.01 percent of Cu and the balance of Zn. The zinc-based multi-element alloy has the advantages that: (1) in the alloy, the Al, Ni, Si, Cu and other elements are reasonably mixed, so the corrosion resistance of a hot-dip coating is obviously improved by over 20 percent than that of a pure zinc coating, meanwhile, the aluminium content is controlled within 3 percent so as to ensure that the alloy has good dip plating performance; and (2) in the alloy, La, Ce, Pr and other rare-earth elements and Mg element are reasonably mixed, so the fluidity and wetting performance of alloy plating solution are further improved, the surface quality of the coating is good, and the metal consumption is reduced by over 20 percent than that of the traditional galvanization. The zinc-based multi-element alloy and the preparation method thereof have obvious advantages in the aspects such as improving performance quality of hot-dip galvanized products, reducing metal consumption and reducing production cost.

A quick heating and quick cooling highlight molding die comprises a fixed die (1) and a movable die (6) matched with the fixed die (1) and positioned above the fixed die (1). The highlight molding die is characterized in that the inside bottom of the fixed die (1) is provided with a cooling block (2) with a cooling liquid passage (3), a floating insert (4) is arranged above the cooling block (2), the inside of the floating insert (4) is provided with a heater (5), and a workpiece die cavity is formed between the floating insert (4) and the movable die (6); an elastic piece for keeping a clearance (14) between the floating insert (4) and the cooling block (2) is arranged between the floating insert (4) and the cooling block (2); and a director is arranged between the floating insert (4) and the cooling block (2). During injection molding, the die has certain temperature so as to ensure that a melting material does not produce melting marks and flowing marks during flowing and butting in the die cavity, and meanwhile ensure the appearance and quality of the product so that the surface luster of the product is even and consistent; and maintaining the pressure after injection, the product can be quickly cooled and timely molded.

The invention discloses a spraying method of a small part. The method comprises the steps of a, clamping the part; b, primary spraying: spraying one side of the part, enabling a tooling to rotate slowly at the speed of 2-3r/ min, adopting a small spray gun, and spraying along the direction of an included angle within the range of 150-450 degrees, at the interval of the straight-line distance of 10-30mm and under the compressed air pressure of 0.35-0.5MPa; c, low-temperature baking: after the spraying, transferring a fixture and the part in parallel into a hot air device with a function of low-temperature baking function, controlling the temperature to be 20-30 DEG C, and pre-baking the fixture and the part for 25-35min until the sprayed surface of the part is dried; d, secondary spraying: after low-temperature baking, overturning the part, spraying the other side of the part which is not sprayed according to the step b, and then carrying out low-temperature baking according to the step c; e, treating by curing. The spraying method of the small part has the characteristics of being high in spraying quality, material-saving, simple and convenient in processing and low in cost.

The invention discloses a rust-removing and spot-removing method for a synchronizer gear ring. The method comprises steps of removing oil; performing rust-removing and spot-removing treatment by using a rust-removing and spot-removing aqueous solution; rinsing the treated synchronizer gear ring in clear water; dipping the rinsed synchronizer gear ring in an aqueous soap solution; passivating the dipped synchronizer gear ring in a passivation solution; dipping the passivated synchronizer gear ring in water having a temperature of 60-80 DEG C; and drying. The method is simple in operation and low in investment. By the method, the synchronizer gear ring can regain a surface coating with high quality. The synchronizer gear ring treated by the steps is uniform and glossy and free from flow marks and environment pollution, and is passivated without the chromate. The synchronizer gear ring treated by the method cannot be corroded again in a storing process.

The invention discloses a free-spraying metallic-luster injection molding process for car interior trim parts and exterior parts. The free-spraying metallic-luster injection molding process comprises the following steps: adding metal powder into a raw material which is a plastic base material, and arranging a random water path close to a mould cavity of an injection mould with the high surface quality and the small thermal deformation to enable the surface temperature of the mould to be uniform; pouring the mould by adopting a hooked pouring gate, a pin-point gate and a side pouring gate; controlling the temperature of the surface of the mould in an injection-molding process; and pouring by adopting one or more pouring gates by adopting a high-pressure low-speed injection molding technique, a low-pressure high-speed injection molding technique or a normal-pressure normal-speed injection molding technique, and a sequential injection molding process, wherein the pouring gates adopt a needle valve type pouring gates. The parts produced by adopting the free-spraying metallic-luster injection molding process have no flow marks and solution marks on surfaces, have the good metallic luster and can be used for car interior trim parts and exterior parts.

The invention discloses a manufacturing method for a seamless ball screen. The manufacturing method includes that needed resin mixture is prepared, the resin mixture is coated and distributed on the surface of a spherical die in a spray coating mode, coating operation is repeated after the resin mixture is totally solidified until the required coating thickness is achieved, then, a flange is sleeved on a ball opening of the spherical die after being coated, demolding process is carried out, a seamless ball is obtained, an imaging layer is coated on the surface of the seamless ball and the seamless ball screen is obtained. The manufacturing method for the seamless ball screen has the advantages that the inner surface and the outer surface of a ball body are smooth, no polishing process is needed, meanwhile, the die can be made very thin, demolding is quite easy, a resin thin film solidifies quickly, efficiency is largely improved, quality of the coated transparent ball is good, qualified rate is extremely high (more than 95%), the coated imaging layer is even, rill marks or other flaws can not occur, and aging effect of ultraviolet rays can be effectively prevented.

The invention discloses a spraying-free metal-texture high-gloss high-weather-resistance PMMA/ASA alloy material and a preparation method thereof. AS resin, PMMA resin, ASA rubber powder, glass powder, a pigment and auxiliary agents are mixed and then added into a screw extruder, and the spraying-free metal-texture high-gloss high-weather-resistance PMMA/ASA alloy material is obtained through extrusion. The metal-texture high-gloss high-weather-resistance PMMA/ASA alloy material provided by the invention is a material which can realize a colorful appearance effect without paint spraying treatment, with direct injection molding and without spraying, so that the cost is reduced, the environment is protected, the production process is simple, the product yield is improved, the application prospect is wide, and the PMMA/ASA alloy material has a good use value.

The invention provides a die for thermoplastic polyurethane elastomer compression molding. The die comprises an upper die body (1), a die core (2), and a lower die body (3), wherein the die core (2) comprises a molding body structure, a rectangle positioning block (13) and a handle (12); the upper die body (1) comprises a first molding cavity (9), a positioning groove (5), and positioning post (4); the lower die body (3) comprises a second molding cavity (10), a positioning groove (5), a positioning hole (6), a sealing groove (7), a sealing joint strip (8) and a positioning clip (14); and whenthe upper die body (1) and the lower die body (3) complete molding closing, the inner surfaces of the first molding cavity (9) and the second molding cavity (10) are in consistence with the outline of the molding body structure, and the positioning grooves (5) of the upper die body (1) and the lower die body (3) are in consistence with the outline of the rectangle positioning block (13). The technical problems of difficulty in demolding and cracking of the mold closing line are solved by means of the die for thermoplastic polyurethane elastomer compression molding; and stripping is easy, andthe die for thermoplastic polyurethane elastomer compression molding is suitable for compression molding of thermoplastic elastomer material.

The invention relates to the technical field of 3D printing sand casting, in particular to a 3D printing sand mold water-based dip coating and a preparation method thereof. The 3D printing sand mold water-based dip coating is prepared from the following components in percentage by weight: 50 to 75% of composite refractory aggregate, 3 to 6% of composite suspending agent, 0.8 to 1.2% of composite binder, 0.1 to 0.5% of penetrant, 0.2 to 0.6% of leveling agent, 0.05 to 0.2% of DL-T201 preservative, 2 to 5% of flux, 0.1 to 0.3% of defoamer, and 25 to 38% of water. The invention also discloses a preparation method of the 3D printing sand mold water-based dip coating. The coating has excellent performance, excellent coating property, proper permeability, good leveling property, high suspensionstability, suitable coating thickness, good sintering peeling property and superior anti-sticking property. Compared with conventional coatings, the coating can be applied only once by dip coating. The penetration depth and coating thickness can meet the requirements. After drying, the coating strength is very high. No flow mark, no dripping, and no accumulation exist.

The invention discloses an injection pressure-boosting and speed-increasing structure of a die casting machine. The injection pressure-boosting and speed-increasing structure comprises an injection punch, wherein an injection part is arranged at one side of the injection punch; an injection oil cylinder, an injection piston rod and a pressure-boosting oil cylinder are sequentially arranged at the other side of the injection punch; a pressure-boosting cavity is formed between the injection piston rod and the pressure-boosting oil cylinder; and a primarily quick oil path block assembly and a secondarily quick oil path block assembly are arranged on the pressure-boosting oil cylinder. According to the injection pressure-boosting and speed-increasing structure, the speed of the primarily quick action and the secondarily quick action is increased by a design method and a control mode which are combined with a practical production process, so that requirements of producing thin-wall parts such as a magnesium alloy mobile phone middle plate and the like are met, and a common horizontal type cold chamber die casting machine is transformed into a special die casting machine for thin-wall parts represented by the die-cast magnesium alloy mobile phone middle plate; the modified die casting machine can realize that cast pieces are full, less in shrinkage cavities, smooth in surface, good in smoothness, free of flow marks, less in flanges, free of air bubbles and flaws and high in practicability, and meet processing requirements.

The invention discloses a multi-station powder coating machine for the inner wall of a spiral lamp tube. The multi-station powder coating machine comprises a turntable and a drying channel which are along the circumference; a plurality of station devices are uniformly distributed on the turntable; the multi-station powder coating machine is characterized in that air collection boxes are arranged on the station devices; the air collection boxes are connected with air inlet pipes; a row of corrugated pipes are arranged on the air collection boxes; a rotating shaft is arranged on each station device; a workpiece seat is arranged on each rotating shaft; and each workpiece seat is aligned with the outlet of each corrugated pipe. By the multi-station powder coating machine, air can be blown to a spiral lamp tube workpiece which is subjected to powder coating by the corrugated pipes which can be bent at random angles; powder is coated on the inner wall of the lamp tube uniformly without accumulated powder or flow mark; the powder coating quality of the inner wall of the lamp tube and the light efficiency of the lamp tube are improved; and the continuous automatic operation of powder coating and drying of the spiral lamp tube can be realized.