182results about How to "Not prone to scratches" patented technology

The invention discloses an aqueous grinding fluid applied to super precision grinding of hard and brittle materials and an application method thereof. The grinding liquid contains chelant 0.1-5, a pH value regulator 5-15, a suspending agent 0.2-5, a dispersion stabilizer 0.5-10, a lubricant 5-20, an antirusting agent 0.5-5, fungicide 0-2, a defoamer 0-2 and deionized water compensating the balance of total amount of 100 parts. Under an alkali condition, the aqueous grinding fluid applied to super precision grinding of hard and brittle materials is beneficial for grinding materials with various sizes, has good suspension property and dispersion stability; when the aqueous grinding fluid is used for super precision grinding of various different hard and brittle materials, especially high-hardness materials, scratches, etching pits and other defects are not produced easily; and the grinding speed is high, the subsequent cleaning is convenient; and the aqueous grinding fluid has excellent lubricating property and antirusting property when in matched use with the grinding materials, and the mixing liquid is uniform in color and has no sediment in 48 h. When the aqueous grinding fluid is used for grinding a wafer on a grinding machine, the ground wafer is subjected to water-added ultrasonic washing, and the wafer has good surface smooth finish, no scales, etching pits and other defects, and the surface roughness can be within 2 microns.

The invention discloses a demoulding agent. The demoulding agent is prepared from, by weight, 12%-18% of organic dibasic acid, 7%-16% of sodium hydroxide, 2%-6% of sodium polymethacrylate, 0.2%-0.8% of isodecanol polyoxyethylene ether, 0.1%-0.5% of polyacrylamide, 0.5%-4% of polyisobutylene succinic anhydride, 1%-7% of organic silicon resin, 0.1%-0.2% of defoamer and the balance water, wherein the organic dibasic acid adopts phthalandione or isophthalic acid or hexanedioic acid. The demoulding agent does not contain graphite and has excellent high-temperature adhesion property, lubricating property and cooling property, the demoulding effect is good, the compatibility with water is excellent, removing through water washing is facilitated, an extremely strong protective effect is exerted on a mold, and it can be guaranteed that residues of the mold are less, the surface is bright and smooth, and the service life of the mold is greatly prolonged.

The invention discloses roasting type alkyd amino special steel drum paint and a preparation method thereof, and relates to the paint industry; alkyd resin, preformed gel and amino thinner are added into a container to be stirred at high speed; titanium dioxide is added in; the obtained paint paste is ground and dispersed by the pouring tray of the sander with dispersing and grinding grain size of below 15mm, and then poured into the large basin of the container; and then butanol, xylene, epoxy resin, n-butanol etherified melamine resin, adhesion promoting resin, interface activator and agent are added into to be stirred evenly, so as to obtain the qualified product of the invention finally.

The invention relates to a self-lubricating self-sealing graphite gas-floatation electrostatic pressure spindle structure. The spindle structure comprises a spindle, a thrust collar arranged on the end part of the spindle, a sleeve arranged outside the spindle in a sleeving manner, a motor stator and a motor rotor, wherein a front bearing bush and a rear bearing bush which are made of a porous material are arranged between the sleeve and the spindle; the front bearing bush is arranged on the front end of an inner hole of the sleeve; the rear bearing bush is arranged on the rear end of the inner hole of the sleeve; a front end cover and a rear end cover are respectively arranged on both ends of the spindle. Because a porous bearing which has good radial rigidity and thrust rigidity is adopted and a throttler and the bearing are integrated into a whole, the cost of the throttler is saved; the front bearing bush and the rear bearing bush are made of the porous graphite material, and because graphite is a solid lubricant per se and a gas membrane is a gas lubricant per se while floating, the spindle does not easily undergo bearing shoe grinding and has good self-lubricating property when the rotating stability is relatively poor; the spindle structure disclosed by the invention also has the advantages of simple structure, relatively stable sealing property, difficulty in inclination of the spindle, stable swinging operation and the like.

The invention relates to a scratch resistant environmental low-smoke halogen-free flame resistant sheath material for a special optical cable. The sheath material comprises the following components by weight percent: 15-25% of ethylene-vinyl acetate copolymer, 5-10% of polyethylene, 5-10% of polyethylene elastomer, 45-60% of flame retardant, 5-10% of compatilizer, 0.5-2% of antiwear agent, 0.5-1.0% of lubricant and 0.1-0.5% of antioxidant. The material of the invention has no halogen, low pollution to the environment, good flame resistant performance, low smoke caused by burning and low irritation to human. The outer sheath of the cable prepared by the sheath material of the invention has excellent surface abrasion resistance and scratch resistant so that the surface of the outer sheath is not easy to scratch during construction and used processes and can maintain good appearance quality.

The invention belongs to a fast-curing casting resin for bathroom accessories and a preparing method and a using method thereof. In the fast-curing casting resin for the bathroom accessories, o-phenyl type unsaturated polyester resin is used as a matrix resin; and the fast-curing casting resin comprises the following materials in percentage by weight: 18 to 22 percent of o-phenyl type unsaturated polyester resin, 28 to 32 percent of 200-mesh calcium carbonate, 22 to 26 percent of 300-mesh calcium carbonate, 14 to 18 percent of quartz sand and 15 to 10 percent of white micro-bead. A small amount of additive is also added into the formula, and the additive comprises an accelerating agent, a low contraction agent and a curing agent, wherein the addition of the accelerating agent is 0.2 to 0.8 percent of the weight of the o-phenyl type unsaturated polyester resin, the addition of the low contraction agent is 1 to 1.1 percent of the weight of the o-phenyl type unsaturated polyester resin, and the addition of the curing agent is 1.6 to 2.2 percent of the weight of the o-phenyl type unsaturated polyester resin. The demolded semi-finished product of the casting resin does not need the steps of pressing and re-curing, so the energy consumption is greatly reduced. Meanwhile, the surface of the semi-finished product is hardly scratched, and at least 50 percent of labor can be saved.

The invention provides a high-hardness and high-toughness metal ceramic composition and a preparation method thereof. The high-hardness and high-toughness metal ceramic composition comprises the following raw material components in percentage by weight: 40-70 percent of titanium carbide, 10-30 percent of tungsten carbide, 1-5 percent of tantalous carbide, 3-5 percent of chromium carbide, 10-20 percent of nickel and 5-10 percent of molybdenum. The preparation method of the high-hardness and high-toughness metal ceramic composition comprises the following steps of: 1, providing raw materials; 2, performing ball milling and stirring on each raw material component to obtain powder particles; 3, molding under a high pressure; 4, removing an adhesive and degreasing; and 5, sintering in vacuum at a high temperature. The high-hardness and high-toughness metal ceramic composition is prepared by adopting titanium carbide, tungsten carbide, tantalous carbide, chromium carbide, nickel and molybdenum, has high hardness, high toughness and high corrosion resistance, and is prevented from being broken and scratched.

The invention relates to a multi-purpose bone harvesting device, and aims to solve the problems such as poor effect of bone harvesting of the existing bone harvester. The device comprises a cylindrical body, a positioning rod and a bone harvesting shovel body, wherein the end part of the front end of the cylindrical body is provided with a plurality of serrate bodies which are circumferentially distributed; the rear end of the cylindrical body is provided with a torsion mechanism; the cylindrical body is provided with a central passage which axially runs through and in which the positioning rod and the bone harvesting shovel body can be inserted respectively; the front end of the positioning rod is provided with a positioning conical tip which is exposed out of the front end of the cylindrical body when the positioning rod is inserted into the central passage; the rear end of the positioning rod is provided with a stress part for bearing an external acting force; the bone harvesting shovel body comprises a rod body and a shovel head which is arranged at the front end of the rod body and is provided with a bone storage part. The device has the advantages that the sawing effect is good, the bone harvester can be positioned, skidding phenomenon is not caused easily during sawing, the surface of ilium is not scratched easily, the bone harvesting effect is good, the sawed bone can be quickly cut off from the ilium body and taken out, and multiple bone harvesting processes are realized without drawing out the cylindrical body.

The invention relates to the technical field of materials, particularly to a high-toughness and high-hardness composite material and a preparation method thereof, wherein the high-toughness and high-hardness composite material comprises the following raw materials by weight: 80-90 parts of polycarbonate, 20-35 parts of polymethyl methacrylate, 15-20 parts of a reinforcing filler, 15-30 parts of atoughening modifier, 5-8 parts of a lubricant, 5-10 parts of a compatibilizer, and 3-7 parts of a coupling agent, wherein the reinforcing filler is a mixture of hollow glass microspheres and nanometerboron fibers, and the toughening modifier is a mixture of a styrene-butadiene thermoplastic elastomer and high-density polyethylene grafted maleic anhydride, such that the toughness and the hardnessof the PC-PMMA composite material can be simultaneously increased, the impact resistance and the tensile strength of the PC-PMMA composite material can be increased, the wear resistance is good, the scratch is not easily generated on surface of the product, the fluidity is high, and the processing molding is easy.

The invention discloses a halogen-free flame-retardant resin composition, including polyethylene (PE), modified polyphenylene oxide (MPPO), hydrogenated styrene-butadiene block copolymer (SEBS) and a halogen-free flame retardant , a mixture of non-halogenated red phosphorus, nitrogen-based flame retardants and processing aids. During preparation, the mixture of polyethylene, modified polyphenylene ether, hydrogenated styrene-butadiene block copolymer, microencapsulated coated red phosphorus and nitrogen-based flame retardant is put into a high-speed mixer by weight %, dispersed and mixed Finally, it is melted, extruded, cooled, pelletized, dried and packaged by a twin-screw extruder. The mixture of the invention is suitable for the production of various soft and semi-hard products, such as: coverings for electric wires and cables, injection molded plugs for power cords, etc. The processing flow of the invention is simple and continuous, the production efficiency is high, the cost is low, and the product quality is stable. The product made by the composition of the invention has beautiful appearance, smooth surface and no precipitates.

The invention relates to a paint spraying process, in particular to an antique brass paint spraying process and aims to solve the problem that the surface of a product made by using a conventional antique brass paint spraying process is easily wrinkled and peeled. The process comprises the following main steps: I, performing pretreatment on the surface of a workpiece, namely performing oil removal, atomic ash puttying and polishing treatment on the surface of the workpiece; II, spraying a primer, namely uniformly mixing and stirring a primer, a curing agent and a diluent according to a volumeratio of (4-6):1:3, spraying the surface of the workpiece treated in the step I, and curing for later use; III, performing primary polishing, namely polishing and repairing the workpiece cured in thestep II; IV, spraying a brass finishing coat, uniformly mixing and stirring the brass finishing coat, the curing agent and the diluent according to a volume ratio of (1-3):1:1, spraying the surface ofthe workpiece treated in the step III, and curing. A product made by using the process is smooth and flat in surface, good in paint layer adhesion property and long in service life.

The invention provides a high-strength and high-toughness ceramic material, which is prepared from the following raw materials: zirconite, kaoline, a fibrous material, silicon carbide, titanium dioxide, a composite admixture, aluminum nitride, calcium carbonate, a toughening agent, a foam stabilizer, acetate and a cosolvent. The high-strength and high-toughness ceramic material provided by the invention has good bending strength, fracture toughness and impact resistance, and is excellent in thermal stability and corrosion resistance; the high-strength and high-toughness ceramic material also has excellent high temperature resistance and thermal shock resistance, so that alumina titanate ceramics can be used in practical applications; therefore, the high-strength and high-toughness ceramic material can be widely applied to industrial production.

The invention discloses wallpaper containing a porous silicon carbide-polylactic acid porous fiber modified acrylic resin emulsion coating. A cellulose acetate-copolymerized modified waterborne acrylic resin emulsion is adopted as a resin adhesive in coating slurry used for the wallpaper, and is stable in performance and free of toxic compounds slow in volatilization such as formaldehyde. The formed coating is smooth and elastic and has waterproof, antifouling and antibacterial functions and the like. Compared with traditional PVC paste, plasticizing temperature of the coating can be reduced to 120-150 DEG C. Added porous silicon carbide-polylactic acid porous fibers can endow the coating with excellent gas permeability, effectively improved mechanical strength and highly preponderant wear resistance. The surface of the wallpaper is not liable to scratch. The wallpaper is durable.

The invention relates to a polycarbonate composition, in particular to a low-melting-point scratch-resistant polycarbonate composition and a preparing method of the low-melting-point scratch-resistant polycarbonate composition. The low-melting-point scratch-resistant polycarbonate composition comprises the following ingredients in parts by weight: 70 to 90 parts of polycarbonate, 10 to 25 parts of polylactic acid, 12 to 20 parts of polytrimethylene terephthalate, 5 to 15 parts of flame retardants, 5 to 15 parts of erucyl amide, 3 to 8 parts of glass fiber, 3 to 10 parts of organic silicon toughening agents, 0.1 to 5 parts of polyethylene wax and 0.2 to 0.8 part of antioxidants. The polycarbonate composition provided by the invention has the advantages that the processing temperature of products extruded through an extruding machine is lowered in the subsequent processing process, so the cost of the subsequent processing is reduced, and the energy source waste is reduced.

The invention relates to a three-component alloy plating material for coated steel products with high corrosion resistance and the manufacturing method thereof. The three-component alloy is composed of Zn, Al, Si or a rare earth element. The plating material further contains a trace element as additive, wherein the trace element is selected from Fe, B, Pb, Mn, Ca, Cu, Sb, Sn, Ni, Bi, Ti, or a combination thereof; and the total amount of the trace element is below 0.5 percent. The manufacturing method is also disclosed, which comprises compounding the components at the given ratio, smelting in a smelting furnace at a smelting temperature of 750-800 DEG C, stirring in a non-contact manner, refining, slagging off, and casting to obtain an alloy ingot. The inventive coated steel product has high corrosion resistance, excellent fatigue resistance and strong ability of binding with matrix metals; and is widely used in the industries of household electronic appliances, construction materials and automobiles.

The invention relates to a modified material of a color profile material, in particular to an ASA (acrylonitrile-styrene-acrylate) modified material, which solves the problems that: because of the scratches and the strias, the chromatic aberration and matt surface are always generated during the preparation of color profile material by ASA resin. According to the mass ratio, the ASA modified material comprises: 40 to 60 portions ASA resin, 0.15 to 0.25 portions light stabilizer, 0.15 to 0.25 portion ultraviolet adsorbent, 4 to 5 portions dispersing agent, 4 to 5 portions lubricant, 5 to 15 portions reinforcer, 5 to 15 portions upgrading nucleating agent, 0.1 to 0.3 portions coupling agent and 1 to 5 portions color pigment. The modified material of a color profile material has the advantages that: based on the performance of good color pigment, rich colors and favorable weatherability of the prior art, the ASA modified material prepared has higher toughness, rigidity and intensity; meanwhile, ASA modified material can be exposed in the conditions with ultraviolet, wet air, rain, lighting and ozone for long time; furthermore, the color profile material prepared has uniform colors, favorable glossiness of the surface without chromatic aberration.

The invention discloses an LED display screen, which is provided with a lamp face. A protection resin layer and an elastic resin layer are sequentially arranged on the lamp face of the LED display screen, and the protection resin layer is located between the elastic resin layer and the lamp face. According to the LED display screen, the properties such as water prevention, dust prevention and impact prevention of the lamp face of the LED display screen can be improved through the protection resin layer, the properties of scratching resistance and edge breakage resistance of the protection resin layer can further be improved through the elastic resin layer, and thus the lamp face of the LED display screen is not prone to the phenomena of scratching and edge breakage; by arranging the protection resin layer and the elastic resin layer simultaneously and meanwhile retaining an original protection resin layer to protect lamp beads against being damaged by external force, the problems of scratching, edge breakage and the like of the surface of a current glue filling LED display screen can be effectively solved; and meanwhile, the high-toughness elastic resin layer on the outermost layerfurther has certain elasticity, external impact can be effectively buffered, and thus the lamp face of the LED display screen is good in impact-resistance strength.

The making process of rod body for fishing rod includes winding one polymer material layer without superposing outside one compound material layer; spraying one extinction material layer to the surface of the polymer material layer; winding one layer of combining material of smelting point lower than that of the polymer material layer with partial superposing to the extinction material layer; sintering to form rod body core in complex layered structure; removing the rod body core from one mandrel and peeling off the combining material layer to form the rod body for fishing rod.

The invention discloses a digital city vehicle management system, which comprises a parking management server, a vehicle identity recognition assembly, a radio frequency access arranged at an entrance and a radio frequency remote control carport arranged in a parking lot, wherein the parking management server comprises a wireless communication module and a parking information management system; the vehicle identity recognition assembly comprises a Bluetooth access control card and a wireless radio frequency identification card; the radio frequency access comprises a radio frequency reader, a barrier gate controller and a barrier gate; and the radio frequency remote control carport comprises parking space, a geomagnetic sensor, a wireless radio frequency card reader and a carport lock. The digital city vehicle management system has the advantages that the structure is simple; the design is reasonable; through the vehicle identity recognition assembly with stored value which is handled by the user, entering and leaving without getting off the vehicle by the user can be realized, a parking charging rule is optimized, charging and timing are carried out only when the vehicle of the user totally stops; and due to the arrangement of the carport lock, the stopping vehicle of the user can be effectively protected, and vehicle damage accidents such as scratches are not likely to happen.

The invention relates to a roller guide and guard unit for a loop. The unit comprises a bracket; a guide pipe frame is installed above the bracket; an entrance guide pipe is arranged at an entrance of the guide pipe frame while an exit guide pipe is arranged at an exit of the guide pipe frame; two guide roller seats with the same structure are respectively arranged at the left and the right above the guide pipe frame; and the relative distance between the two guide roller seats can be adjusted. The roller guide and guard unit for the loop is suitable for rolling wire products with high added values, the surface of a rolled piece can be protected, no steel scratches and adhesion exist, and the surface of the rolled piece can be protected from being scratched. The abrasion of a guide slot is effectively reduced and the use cost of the guide slot is reduced. The roller guide and guard unit for the loop has the advantages of obvious design effect, strong practicability, improvement on working performance, simple structure, convenience for assembly and disassembly, simplicity and convenience in operation and low production cost.

The invention discloses an automatic glass inspection and film production system and an application method thereof. The system comprises an automatic loading platform and an automatic unloading platform used for automatically loading and unloading the glass, and a horizontal measurement roll-over platform, a film machine and a vertical roll-over platform which are sequentially arranged between theautomatic loading platform and the automatic unloading platform according to operation. The automatic loading platform is used for loading the glass to the horizontal measurement roll-over platform,the horizontal measurement roll-over platform is used for realizing rotation of the glass from a horizontal state to a vertical state, after length of the glass is measured, the glass is sent to the film machine, the output-needing glass in the film machine is conveyed to the vertical roll-over platform, the vertical roll-over platform is used for realizing rotation of the glass from a vertical state into a flat state, and the glass is unloaded through the automatic unloading platform. The system is advantaged in that functions are complete, the automation degree is high, work efficiency is improved, manpower is greatly reduced, length measurement of the glass is efficient and accurate, film matching precision is high, connection performance in the glass conveying process is excellent, andscratch is not easy to occur.

The invention relates to a high-toughness and impact-resistant resin eyeglass and a preparation method thereof; the resin eyeglass comprises the raw materials in parts by weight: 20-25 parts of dimethyl 1,4-benzenedicarboxylate, 20-25 parts of dimethyl 1,3-benzenedicarboxylate, 3-5 parts of allyl alcohol, 12-15 parts of an allyl ether phenolic resin, 12-15 parts of pentaerythritol tetrakis(2-mercaptoacetate), 8-10 parts of hexamethylene-1,6-diisocyanate, 8-10 parts of bismaleimide, 1.5-3 parts of a wear-resisting agent, 0.5-1.5 parts of a catalyst, and 0.5-1.5 parts of an internal mold release agent. While the resin eyeglass is ensured to have excellent refractive index, the chemical resistance is allowed to be greatly improved, the toughness and impact resistance of the prepared resin eyeglass can be greatly improved, scratches and a breaking phenomenon are not easily generated, and the service life is facilitated to be greatly extended.

The invention relates to ABS (Acrylonitrile Butadiene Styrene) modified resin with high hardness, flame retardance and antistatic property. The ABS modified resin comprises the following components of ABS resin, aromatic polyimide fibers, diazo diphenylamine paraformaldehyde condensation product, a polyisocyanate block, silicone-modified polyurethane resin, 6-ethyoxyl-2,2,4-trimethyl-1,2-dihydroquinoline, styryl pyridine dimethyl sulfate salts, isobutyraldehyde, a curing agent, dimethoxy dipropylene glycol, polyvinyl butanol, an antistatic agent, zinc ferrite, 4-tert-Butylcyclohexanone, cyclododecanone, barium sulfate, 1,2,3,4-cyclopentanetetracarboxylic acid and deionized water. The ABS modified resin disclosed by the invention has the characteristics of high hardness, flame retardance and antistatic property.

The invention discloses a nano-material modified thermal insulation interior wall coating and a preparation method thereof. The coating is prepared from the following raw materials in parts by weight: 30-50 parts of acrylic emulsion, 2-4 parts of titanium dioxide, 3-5 parts of an enhancement solution, 0.3-0.5 part of a defoaming agent, 0.5-2 parts of a dispersing agent, 1-3 parts of a film-forming agent and 20-30 parts of water. The enhancement solution is prepared in the preparation process, the enhancement solution can also have a large amount of long-chain alkyl, the long-chain alkyl has a good hydrophobic effect, after the coating forms a coating film, the surface of the coating film has a good hydrophobic effect, meanwhile, the coating film is more convenient to clean, meanwhile, the coating film contains macromolecular chains and has good corrosion resistance, the internal rotation barrier energy of the molecular chain is low, and the molecular chain segment is easy to rotate, so that the toughness of the dried coating film is higher, the coating film is not easy to scratch, and the attractiveness of the coating film is ensured.

The invention discloses a novel environmentally-friendly wood-plastic floor material and a preparation method thereof, and relates to the technical field of coatings. The material comprises, by weight, 15-25 parts of polyacrylic resin, 12-20 parts of polyamide resin, 20-35 parts of vegetable fibers, 8-13 parts of ceramic fibers, 5-12 parts of seashell powder, 7-15 parts of diatomaceous earth, 4-10parts of glass beads, 5-12 parts of expanded perlite, 10-18 parts of silica gel particles, 4-9 parts of nanometer titanium dioxide, 3-7 parts of nanometer magnesium oxide, 2-5 parts of nanometer molybdenum oxide, 2-5 parts of nanometer titanium nitride, 3-7 parts of peppermint essential oil, 4-7 parts of activated carbon, 5-10 parts of a plant regulator, 1.3-2.5 parts of a foaming agent, 2.4-3.8parts of a flame retardant, 1.4-2.6 parts of a plasticizer, 1.8-3.2 parts of an anti-aging agent and 30-45 parts of a 25 wt% ethanol solution. The material has the advantages of good aging resistance,no formaldehyde substances, greenness and environmental protection.

The invention discloses a highly-flame-retardant scratch-resistant frosting TPE sheathing material. The highly-flame-retardant scratch-resistant frosting TPE sheathing material comprises the following components in percentage by weight: 15 to 35 percent of styrene block copolymer, 6 to 15 percent of modified polyphenyl ether, 7 to 15 percent of thermoplastic dynamic vulcanized rubber, 5 to 18 percent of polyolefin, 8 to 15 percent of extending oil, 3 to 10 percent of plasticizer, 20 to 35 percent of flame retardant, 0.8 to 3 percent of lubricant and 0.2 to 0.5 percent of UV stabilizer. As compared with the prior art, reasonable proportions of components are obtained through elaborate design and repetitive tests, finally the highly-flame-retardant scratch-resistant frosting TPE sheathing material is obtained, the surface of the outer sheath produced by using the material disclosed by the invention is wear-resistant, the scratch resistance is excellent, scratches are not easily produced on the surface, the maximum oxygen index can reach to 40, the flame-retardant effect is very good, and the material further has the advantages of good frosting hand feeling, high oil resistance, low surface gloss, high tensile strength, good impact resistance and low temperature resistance, good processing performance and the like.

The invention provides a high-hardness and high-toughness metal ceramic composition and a preparation method thereof. The high-hardness and high-toughness metal ceramic composition comprises the following raw material components in percentage by weight: 40-70 percent of titanium carbide, 10-30 percent of tungsten carbide, 1-5 percent of tantalous carbide, 3-5 percent of chromium carbide, 10-20 percent of cobalt and 5-10 percent of molybdenum. The preparation method of the high-hardness and high-toughness metal ceramic composition comprises the following steps of: 1, providing raw materials; 2, performing ball milling and stirring on each raw material component to obtain powder particles; 3, molding under a high pressure; 4, removing an adhesive and degreasing; and 5, sintering in vacuum at a high temperature. The high-hardness and high-toughness metal ceramic composition is prepared by adopting titanium carbide, tungsten carbide, tantalous carbide, chromium carbide, cobalt and molybdenum, has high hardness, high toughness and high corrosion resistance, is prevented from being broken and scratched, and is non-irritant to human bodies.