48results about How to "Strong covering" patented technology

The invention discloses an auxiliary chemical that can increase the coverage when being used for coating in tanning industry and is a non-yellowing blowing promoter used for leather coating. The blowing promoter comprises the following ingredients (weight percentage): 5-20 percent of acrylic acids microspheres, 10-30 percent of WBPU, 10-30 percent of waterborne acrylic resin, 0-10 percent of octowax, 0-10 percent of fat liquor, 1-5 percent of stabilizer and 20-40 percent of water. The product of the invention adopts foam microspheres, thus having excellent coverage and completely covering certain flaws and spots on inferior leather; the invention adopts acrylic acid / nitrile foam microspheres as a substitute for general polyvinyl chloride, as well as adopts various non-yellowing waterborne polymer resins and various non-yellowing waterborne oil / wax auxiliaries, to compound a non-yellowing leather priming coat auxiliary, which has excellent non-yellowing performance high up to the topmost 5 grade and does not turn yellow within 24 hours after 4 hours of ultraviolet irradiation at the temperature of 120 DEG C. The use of the product of the invention can promote the tanning grade to an extreme extent in tanning industry.

The invention relates to the holographic anti-counterfeiting printing industry, in particular to a manufacturing method for the double-layer holographic anti-counterfeiting film. Printing ink is partially printed between a laser information layer and an aluminum-plated layer, and random anti-counterfeiting holographic color piece carrier dope partially coats the part between the laser information layer and the aluminum-plated layer to form double-layer hologram to prepare a product with the double-layer holographic film; the manufacturing method also can prepare double-layer hologram which is completely coated with the random anti-counterfeiting holographic color piece carrier dope through secondary coating; when identifying, the anti-counterfeiting holographic color piece in the partially anti-counterfeiting holographic color piece carrier dope layer is manually peeled from a product body by an identifying person to server as independent anti-counterfeiting holographic information material; the identifying person inspects the product authenticity in an experience mode, a traditional anti-counterfeiting method is combined with a two-dimensional code, the conversion of the anti-counterfeiting mode provides a lot of product information, different unique anti-counterfeiting methods are used, and the two-dimensional code and the randomly sprayed color piece make up a variety of unique patterns to meet the anti-counterfeiting uniqueness requirement; the double-layer holographic anti-counterfeiting film is a new anti-counterfeiting identifying mode, enables the anti-counterfeiting data information amount to be expanded, is convenient to identify and enables the laser anti-counterfeiting identifying efficiency to be improved.

The invention discloses a non-uniform nucleation coating treatment method of a soft magnetic composite material with high saturation magnetic flux density. A ferrite insulating layer was uniformly coated on the surface of metal magnetic powders by heterogeneous nucleation process, and the soft magnetic composite was prepared by bonding, pressing, high temperature annealing and spraying process. The invention has the advantages that: As that coat layer is ferromagnetic material, the magnetic dilution effect can be effectively reduce, and the soft magnetic composite material with high saturatedmagnetic flux density and high permeability can be easily prepared because of good oxidation resistance and high resistivity; the magnetic powder is uniformly coat by a heterogeneous nucleation process, and the coating layer is compact and controllable in thickness; And the coating method is superior to the existing ferrite coating process, the method is simple and suitable for industrial production.

The invention relates to the technical field of impregnating agents, and discloses a film forming agent suitable for glass fibers, an impregnating agent comprising the same, and a preparation method and applications of the impregnating agent. The film forming agent comprises emulsified bisphenol A type epoxy resin and polyester type polyurethane. Through the emulsification effect of a surfactant, the interfacial energy of a system is reduced, the stability of epoxy resin emulsion is improved, and thus the function of the epoxy resin emulsion can be better exerted. The polyester polyurethane film forming agent has a large molecular weight and a strong yarn-wrapping performance and easily forms a compact film on the surface of glass fibers, thus the glass fibers are isolated from the external environment, water will not enter the cracks of the glass fibers, the elasticity and wear resistant performance of yarns are improved, the anti-fatigue performance of yarns is strengthened, at the same time, the bundling force is high, and the phenomenon of yarns such as natural draping, non-uniform tension force, and the like, is effectively relieved.

The invention discloses a high-adhesion wear-resistant antifouling paint which is prepared from the following raw materials in parts by weight: 32-35 parts of dicyclopentadiene phenol epoxy resin, 25-28 parts of terpene resin, 10-13 parts of phenol formaldehyde resin, 17-20 parts of iron-titanium dioxide composite modified polystyrene microsphere, 10-13 parts of light calcium carbonate, 4-8 parts of nano attapulgite, 1-3 parts of mica powder, 0.8-1.2 parts of silane coupling agent KH-550, 1.2-1.5 parts of curing agent, 0.6-0.9 part of defoaming agent, 1.5-1.8 parts of leveling agent, 1.2-1.5 parts of pigment and 50-53 parts of solvent.

The invention discloses a preparation method of an ultrawhite, easily dispersible and high stability powder special for water-based paint. The method includes the following steps of: (1) breaking: making naturally produced lump ores with a light color into granules with a size smaller than 6mm; (2) screening: screening the granules in step (1) into granules with a size of 1mm-6mm by a screening machine equipped with two-layer screens; (3) color difference sorting; (4) crushing and coating: mixing a dispersing and coating aid with a mass part accounting for 0.3%-1.0% of that of the granules with ultrawhite granules, and simultaneously conducting ultrafine crushing and coating treatment, thus obtaining the ultrawhite, easily dispersible and high stability powder that is special for water-based paint and has whiteness of 96%-98%, a powder particle size d97 of 2 micrometers to 8 micrometers and an Fe2O3 content of 0.06%-0.12%; and (5) carrying out inspection and packaging. The invention, By means of grain size control, electromechanical color sorting, and crushing / modification ''one-step'' treatment, the whole process involved in the invention has the advantages of high efficiency, short procedure, reasonable heat utilization, high yield of fine powder, even surface coating, and lower dissolution performance, etc. Compared with uncoated powder with the same grain size, the prepared powder can substantially replace titanium dioxide in application in paint.

The invention relates to the technical field of bathroom cabinet wood, in particular to a bathroom cabinet wood pre-treatment technology. The bathroom cabinet wood pre-treatment technology comprises the following steps that S1, wood pre-treatment is carried out; S2, cladding pulp is prepared; and S3, the prepared cladding pulp is coated to a board treated in the step S1. In this way, the wood is treated through an acetylene cutting spraying gun at the high temperature, moisture on the surface of the wood evaporates quickly in the process, meanwhile, the internal texture structure of the wood is not damaged, wee cracks hidden on the surface of the wood expand, and the surface of the wood can be subjected to burr removal treatment at the high temperature. In the coating step, the wood is preheated, the water content of the wood is reduced, on one hand, internal and external temperature of the wood can be coincident, and wood surface cracking and wood internal breakage which are caused bysudden temperature rise are avoided; and on the other hand, the water content of the wood can be reduced, and the absorptivity of the cladding pulp is improved.

The invention discloses a preparation method of a tin sulfide / vegetable sponge nanocomposite. The technical key lies in that a target product is obtained by carrying out a reaction at high temperatureby taking natural vegetable sponge as a carrier and petal-shaped tin sulfide as a photocatalyst. The preparation method has the advantages that: (1) the vegetable sponge is natural, green, pollution-free, wide in source, cheap and available; (2) the reaction condition is simple, the equipment requirement is low, and the energy consumption is low; (3) the product is good in catalytic effect, highin catalytic efficiency and strong in circularity; and (4) the preparation method is safe and smooth in reaction, free of naked fire or smoke and easy to realize industrial amplification.

The present invention discloses a chemical foaming polyethylene composition, a preparation method and applications thereof, wherein the chemical foaming polyethylene composition is prepared from the following components by weight: 70-86 parts of high-density polyethylene, 10-20 parts of low-density polyethylene A, 0.05-0.15 part of a coupling agent, and 4-10 parts of composite foaming agent master batch. According to the present invention, the chemical foaming polyethylene composition retains the high foaming degree of the low-density polyethylene foaming material and the good mechanical property of the high-density polyethylene chemical foaming material so as to obtain the foaming insulation layer having the good electrical property. Another purpose of the present invention is to provide the preparation method of the chemical foaming polyethylene composition, wherein the preparation method is simple and is easy to operate. The present invention further provides uses of the chemical foaming polyethylene composition in preparation of communication cables.

The invention belongs to the technical field of coatings, and particularly relates to an antifouling coating as well as a preparation method and application thereof. The antifouling coating provided by the invention comprises the following components in parts by mass: 2-10 parts of octenyl succinic anhydride emulsified and modified cassava starch; 2-10 parts of acrylic resin; 20 to 50 parts of a solvent; 5-15 parts of a slow release agent; 10 to 50 parts of an antifouling agent; 0-3.5 parts of a dispersant and 1-4 parts of a filler. In the invention, the OSA emulsified and modified tapioca starch can be compatible with acrylic resin, so that the cost of the antifouling coating is reduced, and the slow-release degradation performance of the coating is improved. Experimental data shows thatthe antifouling coating provided by the invention has a dry film thickness of 46.45-48.5 [mu] m and a covering rate of 97-98%, has excellent covering capability on a coated surface under the conditionof a low dry film thickness, can efficiently cover the surface of the bottom of a ship and provide an antifouling function, and has excellent use performance and good slow-release degradation performance.

The present invention relates to an anti-corrosion and wear-resistant bridge stand heightening profile, which comprises a profile body. A layer of protective coating is coated onto the profile body. The protective coating comprises the following components in weight part: 50-80 parts of polyacrylate dispersion, 10-20 parts of trimethyl hexamethylene diamine, 15-22 parts of dispersant, 12-20 parts of silicone oil, 25-40 parts of epoxy resin, 5-10 parts of surfactant, 0-8 parts of zinc phosphate, 1-5 parts of silica and 10-15 parts of corrosion inhibitor. The anti-corrosion and wear-resistant bridge stand heightening profile is good in anti-corrosion performance and excellent in wear-resistant performance, and ensures the connection firmness of bridge stands. Meanwhile, the heightening profile is not easy to be damaged, longer in service life, and safer and more reliable to use at the same time.

The invention discloses a special compounded level marking line color master batch for a PP-RCT cold water pipe, and a preparation method thereof. Raw materials of the color master batch comprise, byweight, 75-90 parts of Yanshan Petrochemical PP-RCT3120, 6-16 parts of phthalocyanine blue 7090, 8-18 parts of an antioxidant, 9-20 parts of a processing aid and 6-15 parts of a surfactant. Compared with color master batches in the prior art, the color master batch in the invention has the characteristics of high dispersibility, high color saturation, strong coating property and good heat resistance, and makes a line have a color saturation reaching 91.5% or above; and the oxidation induction time of the line in the production process is prolonged, and reaches about 60min, so the aging resistance of the color master batch is improved, thereby the produced pipe has a long service life.

The embodiment of the invention discloses water-based ink, a preparation method thereof and a plate. The water-based ink comprises a component A, a component B, a component C and a component D, wherein the component A comprises the following components in parts by mass: 15-25 parts of water-based acrylic resin, 15-45 parts of water-based polyurethane resin, 5-10 parts of a coalescing agent, 10-20 parts of water-based black paste, 5-10 parts of matting powder, 0.5-1 part of a defoaming agent, 0.5-1 part of a dispersing agent, 0.5-1 part of a wetting agent and 0.5-2 parts of a thickening agent, and 0-5 parts of a component A diluent; the component B comprises the following components in parts by mass: 5-15 parts of a curing agent; the component C comprises the following components in parts by mass: 1-5 parts of an adhesion promoter; and the component D comprises the following components in parts by mass: 0-25 parts of a mixed component diluent. The water-based ink disclosed by the invention is convenient to coat, is firmly combined with a base material, and has the advantages of high covering power, matte smoothness, small surface tension, good recoatability, boiling resistance, high temperature resistance and strong bending resistance.

The invention discloses a processing preparation method of pigment yellow, and particularly relates to the technical field of pigment preparation, the prepared pigment yellow 151 has greener light than C.I pigment yellow 154 and more red light than pigment yellow 175, the hue angle is 97.4 degrees (1 / 3SD), the specific surface area is 23m < 2 > / g, and the pigment yellow 151 has good covering power; the light fastness is excellent, a sample is colored in alkyd melamine resin, the weather fastness is 5-grade gray scale, the dilution color is still 4 grade, and the heat-resistant stability in HDPE (high-density polyethylene) with 1 / 3 standard depth is 260 DEG C / 5min; the product is suitable for high-grade industrial coatings and automobile primers, can be used together with phthalocyanine and inorganic raw materials, and can also be used for coloring polyester laminated plastic film printing ink.

The invention discloses an ester solvent environment-friendly thermoplastic acrylic coating. The ester solvent environment-friendly thermoplastic acrylic coating is characterized in that the coating is prepared from the following raw materials in parts by weight: 90-150 parts of aromatic hydrocarbon-free thermoplastic acrylic resin emulsion, 10-20 parts of tert-butyl acetate, 20-30 parts of sec-butyl acetate, 20-30 parts of dibasic acid ester, 20-30 parts of dimethyl carbonate, 4-8 parts of 2-ethylhexyl acetate, 25-50 parts of rutile titanium dioxide, 5-10 parts of silicon dioxide filler and 5-8 parts of additives. The coating disclosed by the invention has the advantages of environmental friendliness, strong chemical resistance, high temperature resistance, good weather resistance, good stain resistance, strong self-cleaning property, long service life of coated film, high mechanical strength and elastic strength and scrub resistance; in addition, by adjusting color to decorate and beautify the appearance of a building, the coating can fully play roles in reflection, heat insulation and heat preservation.

The invention relates to the technical field of papermaking, in particular to high-glossiness coated paper and a production process thereof. Long fiber slurry and short fiber slurry are used as raw materials for preparing the coated paper, pigment prepared from calcium hydroxide, barium sulfate, china clay, organic silicon, AKD, corn starch and the like, an adhesion agent and an organic additive are smeared on raw paper, and the raw paper is matched with high beating degree, proper screen mesh number and coating weight of the raw paper, so that the glossiness of the prepared coated paper can be improved to a great extent. Meanwhile, a blade coating mode is selected, an organic additive is added into mixed slurry, and a uniform coating amount and a specific coating tool bit material are matched, so that a coating layer has good covering power, and the glossiness and the smoothness of a product are further improved. Compared with common coated paper, according to the process for preparing the coated paper, the paper also has the advantages of high whiteness, water resistance, printing ink resistance and the like.

The invention discloses a preparation method of a growth-promoting germ-killing pest-killing additive for special fertilizers for greenhouse cultivation, comprising the steps: mixing red chili, green Szechuan pepper, garlic, root of hairy Asiabell, nutmeg and medicinal Indian mulberry root, and performing drying, crushing and screening to obtain a material A; mixing well the material A and ethyl alcohol, performing ultrasonic treatment, and performing filtering to obtain filter residue and a material B; subjecting the filter residue to Soxhlet extraction, performing concentrating to obtain a material C, mixing the material B and the material C, and performing drying to obtain an active material; mixing well the active material and modified bentonite, and performing coating to obtain this additive. The obtained additive is effective in eliminating disease and pest damage of greenhouse cultivation soil.

The invention discloses a preparation method of a high-performance water-based coating special for elevator guide rails. The preparation method comprises the following steps: S1, material preparation; S2, stirring: adding waterborne epoxy ester resin into a stirring kettle, performing stirring, adding a cosolvent, a drier and an amine neutralizer, performing stirring to dilute and neutralize the resin uniformly, adding deionized water, performing stirring to completely emulsify the resin, performing stirring again, and adding the wetting dispersant, the defoaming agent, the pigment, the filler and the anti-settling aid to obtain uniform pigment and filler slurry; S3, grinding; and S4, paint mixing: taking another stirring kettle, adding emulsion, performing stirring at a second rotating speed, adding the ground pigment and filler slurry, sequentially adding a defoaming agent, a base material wetting agent, an anti-flash-rust auxiliary agent and a thickening agent according to the formula, and performing filtering to obtain a coating product. The coating product is high in drying speed, adhesive force and hardness development speed, the film-forming resin is good in water resistance and salt spray resistance, and the product is good in tensile planing resistance by being matched with a proper amount of pigment filler and auxiliaries.

The invention discloses a reflecting plate. The reflecting plate comprises a substrate (1), wherein a titanium dioxide layer (2) is coated on the surface of the substrate (1); a temperature resistant layer (3) is arranged between the substrate (1) and the titanium dioxide layer (2). The reflecting plate disclosed by the invention can provide very strong reflection function by using the titanium dioxide coated on a cold-roll steel sheet or a galvanized plate so as to realize a heating purpose, and furthermore, the cost is saved.

The invention discloses a preparation method of an aqueous dispersion of an aqueous polyurethane-coated sunscreen and a composition of sunscreen cosmetics. By an aqueous polyurethane coating method, an oil-soluble chemical sunscreen can be directly used for preparing oil-in-water sun scream with water repellency and a high SPF value without emulsification. The sunscreen coated with aqueous polyurethane can uniformly form a film on the skin, and greatly relieves the problem of poor water resistance of a conventional oil-in-water sun scream, and the sunscreen coated with aqueous polyurethane canprevent the skin from absorbing the sunscreen, thereby greatly reducing the irritation of the sunscreen and increasing a sun protection factor (SPF value).

The invention relates to the field of concrete auxiliaries, in particular to a concrete aggregate dispersing agent which is composed of a maleic anhydride-pentaerythritol polymer, polyacrylate or polyacrylate microspheres and alkylphenol polyoxyethylene ether. The maleic anhydride-pentaerythritol copolymer, the polyacrylate or the polyacrylate microspheres and the alkylphenol polyoxyethylene ether in the dispersing agent prepared by the invention have high compatibility, after the dispersing agent is added, the mechanical strength and workability of concrete can be effectively improved, and the water consumption of the concrete can be reduced.

The invention relates to alkali-resistant porcelain glaze. The porcelain glaze is prepared from raw materials in parts by weight as follows: 40-50 parts of silicon dioxide, 4-10 parts of diboron trioxide, 3-8 parts of lithium oxide, 2-8 parts of potassium oxide, 2-8 parts of sodium oxide, 10-15 parts of zinc oxide, 7-12 parts of titanium oxide, 1-2 parts of cobalt oxide, 4-7 parts of zirconium oxide, 4-7 parts of aluminum oxide, 3-8 parts of limestone and 3-8 parts of clay. In a word, the porcelain glaze has the advantages of alkali resistance and good glossiness, fineness and elasticity.

The invention discloses a detachable scratch-resistant transparent protective cover for a cross-country vehicle, and the cover comprises a vehicle roof fixing suite, a compartment front door transparent cover, a compartment rear door transparent cover, a vehicle tail door transparent cover, a vehicle front windshield upper transparent cover, a vehicle engine cover transparent cover, a vehicle head front wheel arch bar transparent cover and a vehicle rear fender transparent cover; the vehicle roof fixing suite is connected with the vehicle tail door transparent cover through an arranged zipper, the vehicle roof fixing suite is connected with the vehicle rear fender transparent cover through an arranged zipper, and the vehicle tail door transparent cover is connected with the vehicle rear fender transparent cover through an arranged zipper. According to the invention, all the parts are independently modularized, the installation is very convenient and fast, and the vehicle paint of the vehicle body is effectively protected when the vehicle passes through the jungle outdoors, so a vehicle owner can feel relieved in the cross-country process; meanwhile, the vehicle paint can be installed anytime and anywhere, and when the vehicle paint of the vehicle body does not need to be protected in other cross-country projects, the vehicle paint can be easily disassembled, and the cleaning is easy.

The invention discloses chlorosulfonated ethylene composite anticorrosive paint with organic montmorillonite modified zinc powder. The composite anticorrosive paint is prepared from the following raw materials in parts by weight: 60 to 65 parts of chlorosulfonated polyethylene latex, 35 to 40 parts of neoprene latex, 7 to 8 parts of polyoxyethylene aliphatic alcohol ether, a proper amount of deionized water, 2.5 to 3 parts of silane coupling agents KH560, 2 to 3 parts of lanthanum oxide, 1.5 to 2 parts of cerous oxide, a proper amount of nitric acid solution with the concentration being 65 weight percent, ammonium bicarbonate solution with the concentration being 50 weight percent, 10 to 12 parts of rutile titanium dioxide, 1 to 1.5 parts of methyl acrylate, 0.8 to 1 part of sodium hexametaphosphate, 6 to 7 parts of flake zinc powder, 3 to 4 parts of organic montmorillonite, 8 to 9.5 parts of silica sol and 1 to 1.2 parts of potassium hydroxide. The prepared paint has the advantages that the mechanical property is excellent; the advantages of good surface adhesion force on the surface of metal, high covering capability, high floating capability and high shielding capability are prominent; the anticorrosion performance is excellent; the process is simple; the industrial control is convenient; the paint is worthy of being popularized.

The invention relates to a foam metal carrier with a high specific surface area. The foam metal carrier is characterized in that: the foam metal carrier is subjected to dip coating of mixed liquor before being calcined, wherein the mixed liquor is formed by mixing and continuously stirring 10 to 15 weight percent of industrial asphalt, 5 to 10 weight percent of industrial nano titanium dioxide powder with average particle sizes of 100 nm and 75 to 85 weight percent of kerosene for 10 to 20 min. The foam metal carrier has the advantages of improving bulk density, reducing oxidation on the surface of the foam metal, improving intensity, increasing specific surface area, improving catalytic efficiency, reducing cost, reducing production potential safety and improving heat treatment process of finished products.

The invention discloses a breathable lactation bra which comprises cups, a chest bib and shoulder straps, wherein one end of each shoulder strap is connected with the chest bib; the other ends of theshoulder straps are connected with the cups; a hasp is arranged between the cups to connect the cups together; baffle pieces are arranged inside the cups; the bottom sides of the cups are arranged onthe outer side of the chest bib and are moveably connected with the chest bib; shaping pads are arranged on the inner sides of the cups; the cross sections of the shaping pads take the shapes of inferior arcs; convex sides of the shaping pads are smooth surfaces; and column grooves are formed in the inner sides of the shaping pads. According to the breathable lactation bra disclosed by the invention, the shaping pads on the inner sides of the cups mainly play a role of supporting the cups, the shapes of the cups can be then maintained, the convex sides of the shaping pads are smooth surfaces,then the shapes of the outer sides of the cups can be maintained, and the awkwardness that moulage can be seen from a coat is avoided; meanwhile, due to the column grooves in the shaping pads, the airbreathability can be improved, the stability of the shaping pads is not affected, meanwhile, the shaping pads are kept in a distance from chests because of the column grooves, then the cups have sufficient air breathing spaces, and together with skin-friendly layers of the inner layers of the cups, the air breathability is improved.

The invention relates to a silver paste spraying process of a novel capacitor laminated pole piece. The silver paste spraying process comprises the following steps: S1, zoning treatment: coating a chaff with insulating glue for zoning and then cutting the chaff, S2, fixing treatment: fixing the cut chaff on a handle strip, and S3, spraying treatment process: fixing the handle strip in a bracket of a spraying mechanism; silver paste spraying is conducted on the first surface, the second surface and the side surface of the chaff at the same time; and the silver paste coating with uniform and flat thickness is formed on the surface of the sprayed chaff and is integrated with the chaff. And S4, drying treatment is conducted, specifically, the sprayed chaff silver paste coating is dried, and the silver paste coating with the expected thickness can be obtained. Quantitative spraying is carried out on the surface of the chaff, so that the coating performance of the silver paste coating is higher, the corners are coated, the pole piece with the uniform coating thickness is obtained, the silver-sprayed coating is thin, multiple pole pieces can be stacked, the pole pieces make full contact with one another, the use amount of materials and the stacking thickness are reduced, meanwhile, the ESR performance is more excellent, and the capacity is improved.

The invention relates to an oil-stain-resistant PVC pipe which is used in the fields such as building, water supply, power supply and communication. The inner surface and the outer surface of the PVC pipe are respectively coated with a titanium dioxide thin film. Each titanium dioxide thin film is an anatase type titanium dioxide thin film, and the thickness of each titanium dioxide thin film is 0.02-0.1mm. The oil-stain-resistant PVC pipe has the advantages that under the natural light or sunlight condition, dirt on the outer surface of the PVC pipe can be removed automatically so that the outer surface of the PVC pipe is cleaned, sterilization of the outer surface of the PVC pipe is achieved automatically, no oil can adhere to the surface of the PVC pipe, the mechanical strength and the adhesive force of the thin films are improved, cracks are avoided, ultraviolet light and moisture are prevented from penetrating through the PVC pipe, and the service life of the thin films is prolonged; meanwhile, the titanium dioxide thin films on the surfaces of the PVC pipe have the good covering capacity, the titanium dioxide thin films are similar to white lead, and the white lead can become black but the titanium dioxide thin films do not become black; the PVC pipe also has the durability the same as that of zinc white, the PVC pipe is not prone to chemical changes, the appearance of the PVC pipe is snow-white all the time, and the good visual effect is achieved.