CN105111881A - Energy-saving and environment-friendly modified acrylic resin coating for door panel of security door - Google Patents
Energy-saving and environment-friendly modified acrylic resin coating for door panel of security door Download PDFInfo
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Abstract
The invention provides an energy-saving and environment-friendly modified acrylic resin coating for a door panel of a security door. The coating is prepared from polyurethane modified acrylic resin, so that the coating has excellent flame resistance and wear resistance and relatively good mechanical property, ageing resistance and chemical corrosion resistance and is high in curing speed, strong in adhesive force, good in ductility and high temperature resistance and long in service life; the processing process is changed, and the roller coating treatment is intensively finished on a panel blank of the door panel of the security door, so that processing procedures are simplified, and a workshop does not need to be independently sprayed.
Description
Technical field
The present invention relates to the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate.
Background technology
Acrylic resin is the resin be made up of acrylate and methacrylic ester and other olefinic type monomers copolymerization, compared with other synthetic macromolecule resins, acrylic resin has many outstanding advantages, as fast light, the weathering resistance of excellence, open air weather resistance of being exposed to the sun is strong, ultraviolet resistance irradiates and not easily decomposes and turn yellow, original gloss and color and luster can be kept for a long time, good heat resistance, the chemical such as good acid-and base-resisting, salt, grease and washing composition are had to stain and corrosive nature, fabulous snappiness and minimum pigment reactivity.Therefore, have a wide range of applications automobile, household electrical appliances, art metal furniture, coiled material industry, instrument, building, textiles, woodwork, papermaking and plastics etc. are industrial.
But the heat that the linear structure of acrylic resin causes sticks cold short, anti-after-tackiness and thermotolerance is not good etc. that shortcoming has a definite limitation to its range of application.The equal phase structure of acrylic resin makes its cold tolerance and resistance toheat be difficult to take into account, and as increased resistance to low temperature, then can lose resistance to elevated temperatures, vice versa, and thus common acrylic acid or the like coating and decorating material just inevitably exists above-mentioned shortcoming.
Overcome the shortcoming of acrylic resin " hot sticky cold crisp ", widen its weather resistance, best method is the aggregated structure changing material, and the second-order transition temperature of material and flow temperature are no longer interrelated.Wherein adopting polyurethane modified acrylic resin to be a kind of method preferably, is also the method studying more, more deep both at home and abroad at present.
The block macromolecular material that urethane is obtained by stepwise polymerization reaction, be made up of polyester soft segment and the hard section of carbamate, the aggregated structure of its uniqueness imparts the excellent weather resistance of urethane.The two phase structure of urethane is it provide splendid weather resistance.Namely the object adopting polyurethane modified acrylic resin is by corresponding modification technology, polyurethane molecular chain is introduced in acrylic resin, modified material is made to be two-phase or multiphase structure, thus the second-order transition temperature of material and flow temperature are determined, to widen the weather resistance of material by different phase region.
At present, the following polyurethane modified acrylic resin coating of domestic existence:
Chinese patent CN201010269992.X, discloses a kind of acrylic resin-polyurethane resin heat preservation coating, and it is mainly made up according to weight proportion stirring of following raw materials according: 60 parts of acrylic resins, 30 parts of closed perlite, 25 parts of cobalt naphthenates, 10 parts of methylcellulose gum, 75 parts of urethane resins, 12 parts of water-ground limestones, 10 parts of diatomite, 6 parts of mortar kings, 10 parts of lacquer thinner, 65 parts of water, 2 parts of defoamers, 8 parts of thickening materials, 6 parts of film coalescence aid.But it only enumerates acrylic resin and urethane resin, but the two does not organically combine formation polyurethane modified acrylic resin, still cannot realize the performance of polyurethane modified acrylic resin.
In addition, the application mode of existing acrylic resin paint adopts spray-coating mostly, such as Chinese patent CN201310607469.7, disclose a kind of thermosetting acrylic resin used for powder coating, this resin ester is equipped with the thermosetting powder coating(s) that unclassified stores is made, the film formed after spraying, has excellent weathering resistance, good flow leveling, excellent surface hardness and high-luster, weather resistance and decorate properties; Can be used for indoor or outdoors shape or material of construction.TGIC can be substituted to a certain extent, avoid the use of toxic substance.
But wherein, spraying is by spray gun or dish-style spraying gun, by means of pressure or centrifugal force, is dispersed into even and fine droplet, is applied over the coating process on coated article surface.Subject matter in spraying is the coating cloud of high dispersing and the solvent (i.e. volatile organic contaminant, VOCs) evaporated, and both contaminate environment, are unfavorable for HUMAN HEALTH, waste coating again, cause financial loss.Volatilization, the coating be diffused in air, then form volatile organic contaminant, be detrimental to health.At painting workshop, coating, as the main source of volatile organic contaminant, is easy to cause acute poisoning during volatile organic compounds excessive concentration in air in painting workshop, and the lighter there will be headache, dizziness, cough, Nausea and vomiting or is dead drunk liquor-saturated shape; Severe one there will be liver poisoning and even goes into a coma very soon, and what have also may be in peril of one's life.Treat for a long time, in the painting workshop of volatile organic compounds pollution, can chronic poisoning be caused, damage liver and neural system, cause general weakness, drowsiness, skin pruritus etc.What have also may cause endocrine disturbance, affects sexual function; Benzene and dimethylbenzene can also damage system, so that cause leukemia.
Summary of the invention
The object of the present invention is to provide the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate, described coating adopts polyurethane modified acrylic resin, described coating is made to have excellent fire-retardant and wear resisting property, and curing speed is fast, also there is good mechanical property, ageing-resistant performance and resistance to chemical corrosion, strong adhesion, ductility are good, high temperature resistant, long service life, change complete processing, roller coat process concentrated by antitheft door door-plate slab, simplify machining clearance, without the need to arranging painting workshop separately.
For achieving the above object, the technical solution used in the present invention is:
The acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate, in described coating, each composition quality mark is as follows: polyurethane modified acrylic resin: 70 ~ 80 parts, Vltra tears: 3 ~ 5 parts, aminoresin: 5 ~ 10 parts, isophorone diamine: 10 ~ 15 parts, diphenylmethanediamiand: 3 ~ 8 parts, cetyl benzenesulfonic acid sodium: 5 ~ 15 parts, Cetyltrimethylammonium bromide: 1 ~ 5 part, pure aluminium silicate: 10 ~ 20 parts, fluorin modified crylic acid ester: 2 ~ 6 parts, organo-siloxane defoamer: 2 ~ 5 parts, aluminium triphosphate: 5 ~ 8 parts, polyamide wax pulp: 5 ~ 10 parts, 1-Methoxy-2-propyl acetate: 30 ~ 40 parts, water: 90 ~ 100 parts.
Further, in described coating, each composition quality mark is as follows: polyurethane modified acrylic resin: 70 ~ 76 parts, Vltra tears: 3 ~ 5 parts, aminoresin: 5 ~ 7 parts, isophorone diamine: 10 ~ 13 parts, diphenylmethanediamiand: 3 ~ 4 parts, cetyl benzenesulfonic acid sodium: 5 ~ 7 parts, Cetyltrimethylammonium bromide: 1 ~ 4 part, pure aluminium silicate: 10 ~ 14 parts, fluorin modified crylic acid ester: 2 ~ 4 parts, organo-siloxane defoamer: 2 ~ 3 parts, aluminium triphosphate: 5 ~ 6 parts, polyamide wax pulp: 5 ~ 7 parts, 1-Methoxy-2-propyl acetate: 30 ~ 34 parts, water: 90 ~ 93 parts.
Preferably, in described coating, each composition quality mark is as follows: polyurethane modified acrylic resin: 73 parts, Vltra tears: 4 parts, aminoresin: 6 parts, isophorone diamine: 12 parts, diphenylmethanediamiand: 6 parts, cetyl benzenesulfonic acid sodium: 6 parts, Cetyltrimethylammonium bromide: 3 parts, pure aluminium silicate: 12 parts, fluorin modified crylic acid ester: 3 parts, organo-siloxane defoamer: 2 parts, aluminium triphosphate: 6 parts, polyamide wax pulp: 5 parts, 1-Methoxy-2-propyl acetate: 30 parts, water: 90 parts.
Separately, the preparation of described polyurethane modified acrylic resin, comprises the steps:
1) nucleus emulsion is prepared
Get the end NCO base polyurethane prepolymer for use as that 30 ~ 40 quality are divided, join in the water that 60 ~ 80 quality divide, stirring and evenly mixing, obtains nucleus emulsion;
2) shell emulsion is prepared
By the methyl methacrylate that 50 ~ 60 quality are divided, the β-dimethyl-aminoethylmethacrylate that 5 ~ 10 quality are divided, the vinylbenzene that 5 ~ 10 quality are divided, the emulsifying agent that 1 ~ 3 quality is divided and the water that 40 ~ 50 quality are divided mixing, stir, emulsification, obtains shell emulsion;
3) polyurethane modified acrylic resin is prepared
Get reaction flask, the water that 30 ~ 40 quality are divided is added in bottle, the initiator that 1 ~ 5 quality is divided, the emulsifying agent that 1 ~ 3 quality is divided, the buffer reagent that 0.5 ~ 2 quality is divided, stirring and evenly mixing, then described nucleus emulsion is added, add after being warming up to 70 ~ 80 DEG C, insulation 40 ~ 60min, then in described reaction flask, shell emulsion is dripped, at the uniform velocity drip, dropwise in 1.5 ~ 2h, wherein, when shell emulsion surplus is 1/5 ~ 1/3, add the reductive agent that 0.5 ~ 2 quality is divided, after shell emulsion dropwises, at 75 ~ 80 DEG C, insulation 1 ~ 1.5h, be cooled to room temperature, filter to obtain described polyurethane modified acrylic resin.
Separately have, described step 2) and step 3) in emulsifying agent be selected from one in oxyethyl group phenolic ether ammonium sulfate, polyoxyethylene nonylphenol ether, allyl ethers hydroxypropyl azochlorosulfonate acid sodium.
Again, step 3) described in initiator be one in Diisopropyl azodicarboxylate, peroxidation two acyl, persulphate.
Further, step 3) described in buffer reagent be selected from one in sodium hydrogen phosphate, Sodium phosphate dibasic and sodium bicarbonate.
And, step 3) described in reductive agent be sodium sulfate salt or sodium hypophosphite.
Separately, described coating is coated to antitheft door door-plate steel slab surface by roll coating model, roller coat temperature 230 ~ 240 DEG C, and roller coat number of times is 1 ~ 2 time.
Beneficial effect of the present invention is:
Described coating adopts polyurethane modified acrylic resin, there is excellent fire-retardant and wear resisting property, and curing speed is fast, also there is good mechanical property, ageing-resistant performance and resistance to chemical corrosion, strong adhesion, ductility are good, high temperature resistant, long service life, change complete processing, roller coat process concentrated by antitheft door door-plate slab, simplify machining clearance, without the need to arranging painting workshop separately.
In the antitheft door door-plate slab stage namely by roller coat by paint spraying provided by the present invention in antitheft door door-plate steel slab surface, form coating, directly can carry out following process, obtain moulding anti-theft door board, even if baroque security door plate structure, also paint spraying is completed in the slab stage, without the need to follow-up application, to instead of in existing technique " be first processed into desired shape; and then spraying obtains moulding product " technique, coating and antitheft door door-plate slab strong adhesion, can not crack because of complete processing or come off.Owing to being the roller coating technology replacement spraying coating process of the shaping quick-drying of roller coat, during application, the availability of coating can reach more than 90%, decrease the volatilization in air and waste, the VOCs that effective reduction causes coating volatilization to be formed because of spraying, VOCs quantity discharged≤420ppm in roller coat workshop, coating environment protecting is good.The security door slab products that roller coat application completes is processed, the curved performance of antitheft door door-plate T can reach 0T (after the finished product slab after roller coat 180 ° bending, completely seamlessly to close up, coating does not burst and comes off) or 1T (after slab twice 180 ° of bendings, outermost painting charge level does not come off, do not burst), ensure antitheft door door-plate quality.
Described polyurethane modified acrylic resin is prepared from by the mode of core-shell emulsion polymerization, obtain heterogeneous latex particle, after tackiness is shouldered when effectively can promote film formation at low temp performance, the high temperature of coating, and make coating have excellent package stability, after being coated in steel slab surface formation film, at high temperature can keep higher hardness, the wear resisting property of coating is greatly improved.
Embodiment
Below by specific embodiment, the present invention is described further, but embodiment does not limit the scope of the invention.
Table 1 is antitheft door door-plate a kind of described in the embodiment of the present invention acrylic resin modified energy-saving and environment-friendly paint composition quality mark list.Table 2 is for preparing polyurethane modified acrylic resin ingredient lists described in the embodiment of the present invention.Table 3 is antitheft door door-plate acrylic resin modified energy-saving and environment-friendly paint performance perameter list a kind of described in the embodiment of the present invention.Table 4 is antitheft door door-plate a kind of described in the embodiment of the present invention coating performance parameter list of acrylic resin modified energy-saving and environment-friendly paint roller coat after antitheft door door-plate steel slab surface.
Described antitheft door door-plate is as follows by acrylic resin modified energy-saving and environment-friendly paint compound method:
The described antitheft door door-plate each component of acrylic resin modified energy-saving and environment-friendly paint is added in high speed dispersor, after stirring, high speed dispersion 30 ~ 60min, stirring, discharging, filtration, packaging, warehouse-in.
Described polyurethane modified acrylic resin process for preparation is as follows:
Get reaction flask, the water that 30 ~ 40 quality are divided is added in bottle, the initiator that 1 ~ 5 quality is divided, the emulsifying agent that 1 ~ 3 quality is divided, the buffer reagent that 0.5 ~ 2 quality is divided, stirring and evenly mixing, then described nucleus emulsion is added, add after being warming up to 70 ~ 80 DEG C, insulation 40 ~ 60min, then in described reaction flask, shell emulsion is dripped, at the uniform velocity drip, dropwise in 1.5 ~ 2h, wherein, when shell emulsion surplus is 1/5 ~ 1/3, add the reductive agent that 0.5 ~ 2 quality is divided, after shell emulsion dropwises, at 75 ~ 80 DEG C, insulation 1 ~ 1.5h, be cooled to room temperature, filter to obtain described polyurethane modified acrylic resin.
Wherein, described emulsifying agent is selected from the one in oxyethyl group phenolic ether ammonium sulfate, polyoxyethylene nonylphenol ether, allyl ethers hydroxypropyl azochlorosulfonate acid sodium.Described initiator is the one in Diisopropyl azodicarboxylate, peroxidation two acyl, persulphate.Described buffer reagent is selected from the one in sodium hydrogen phosphate, Sodium phosphate dibasic and sodium bicarbonate.Described reductive agent is sodium sulfate salt or sodium hypophosphite.
Table 1 (unit: part)
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| Polyurethane modified acrylic resin | 73 | 80 | 70 | 75 | 78 |
| Vltra tears | 4 | 5 | 3 | 4 | 5 |
| Aminoresin | 6 | 8 | 10 | 9 | 7 |
| Isophorone diamine | 12 | 10 | 13 | 15 | 14 |
| Diphenylmethanediamiand | 6 | 8 | 4 | 3 | 7 |
| Cetyl benzenesulfonic acid sodium | 6 | 10 | 5 | 15 | 12 |
| Cetyltrimethylammonium bromide | 3 | 1 | 4 | 5 | 2 |
| Pure aluminium silicate | 12 | 15 | 10 | 20 | 18 |
| Fluorin modified crylic acid ester | 3 | 2 | 6 | 5 | 4 |
| Organo-siloxane defoamer | 2 | 2 | 5 | 4 | 3 |
| Aluminium triphosphate | 6 | 8 | 6 | 5 | 7 |
| Polyamide wax pulp | 5 | 8 | 9 | 10 | 7 |
| 1-Methoxy-2-propyl acetate | 30 | 35 | 40 | 38 | 32 |
| Water | 90 | 95 | 92 | 100 | 98 |
Table 2 (unit: quality is divided)
Table 3
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| Tensile strength (MPa) | 35 | 33 | 25 | 28 | 30 |
| Elongation at break (%) | 9.0 | 8.5 | 8.8 | 8.0 | 8.3 |
| Shore hardness | 65 | 63 | 55 | 60 | 58 |
The acrylic resin modified energy-saving and environment-friendly paint of antitheft door door-plate a kind of described in the embodiment of the present invention is coated in antitheft door door-plate steel slab surface by roll coating model, at 200 DEG C after solidification, be cooled to room temperature, place 48 hours, measure slab top coat performance as shown in table 4.Wherein, the method of the mensuration paint film impact resistance that impact resistance testing method specifies with reference to standard GB/T/T1732-93, falls within the weight of fixed mass (1kg) maximum height (cm) that test plate (panel) does not cause paint film to destroy and represents paint film impact resistance.
Table 4
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| Impact resistance (cm) | 120 | 110 | 118 | 116 | 114 |
| Salt spray resistance duration (h) | 3150 | 3100 | 2900 | 2950 | 3130 |
| Artificial accelerated aging duration (h) | 3200 | 3250 | 3280 | 3100 | 3190 |
| Resistance toheat | 780 | 740 | 750 | 700 | 760 |
Adopt a kind of antitheft door door-plate provided by the present invention antitheft door door-plate obtained after acrylic resin modified energy-saving and environment-friendly paint application antitheft door door-plate slab, the curved performance of T can reach 0T or 1T.Utilization efficiency of coatings is high, and every 30 kilograms of coating can application 1 ton of slab.Do not ftracture under 230 DEG C of high temperature, nondiscoloration, resistance of aging is strong, is placed on the not yellowing in 10 ~ 15 years of outdoor consecutive sunlight, nondiscoloration.Acidproof corrosion resistance is strong, the product that roller coat is good is put into 85 DEG C of water and boils that 2H is raw is heated to 100 DEG C more gradually, product without variable color, fall paint, bubble.After using the Nad solution soaking 24H of 5% at normal temperatures, product surface non-corroding, variable color and coating come off.Pure cotton cloth is dipped in full 95% alcohol to be wrapped on 500g counterweight, wipes examination 50 circulation with the stroke of speed (20mm) left and right of per minute 40-60 time at product surface, and nothing fades de-oiling.Detect according to the X method of drawing in the U.S. ASTM moulding anti-theft door board goods being coated with coating provided by the present invention, can reach the 0=ASTM grade of ISO grade, notching edge is completely smooth, and what edge had not a particle of peels off.
It should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted.Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not depart from the scope of technical solution of the present invention, it all should be encompassed in right of the present invention.
Claims (9)
1. the acrylic resin modified energy-saving and environment-friendly paint of antitheft door door-plate, is characterized in that, in described coating, each composition quality mark is as follows:
Polyurethane modified acrylic resin: 70 ~ 80 parts, Vltra tears: 3 ~ 5 parts, aminoresin: 5 ~ 10 parts, isophorone diamine: 10 ~ 15 parts, diphenylmethanediamiand: 3 ~ 8 parts, cetyl benzenesulfonic acid sodium: 5 ~ 15 parts, Cetyltrimethylammonium bromide: 1 ~ 5 part, pure aluminium silicate: 10 ~ 20 parts, fluorin modified crylic acid ester: 2 ~ 6 parts, organo-siloxane defoamer: 2 ~ 5 parts, aluminium triphosphate: 5 ~ 8 parts, polyamide wax pulp: 5 ~ 10 parts, 1-Methoxy-2-propyl acetate: 30 ~ 40 parts, water: 90 ~ 100 parts.
2. the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate according to claim 1, it is characterized in that, in described coating, each composition quality mark is as follows: polyurethane modified acrylic resin: 70 ~ 76 parts, Vltra tears: 3 ~ 5 parts, aminoresin: 5 ~ 7 parts, isophorone diamine: 10 ~ 13 parts, diphenylmethanediamiand: 3 ~ 4 parts, cetyl benzenesulfonic acid sodium: 5 ~ 7 parts, Cetyltrimethylammonium bromide: 1 ~ 4 part, pure aluminium silicate: 10 ~ 14 parts, fluorin modified crylic acid ester: 2 ~ 4 parts, organo-siloxane defoamer: 2 ~ 3 parts, aluminium triphosphate: 5 ~ 6 parts, polyamide wax pulp: 5 ~ 7 parts, 1-Methoxy-2-propyl acetate: 30 ~ 34 parts, water: 90 ~ 93 parts.
3. the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate according to claim 1, it is characterized in that, in described coating, each composition quality mark is as follows: polyurethane modified acrylic resin: 73 parts, Vltra tears: 4 parts, aminoresin: 6 parts, isophorone diamine: 12 parts, diphenylmethanediamiand: 6 parts, cetyl benzenesulfonic acid sodium: 6 parts, Cetyltrimethylammonium bromide: 3 parts, pure aluminium silicate: 12 parts, fluorin modified crylic acid ester: 3 parts, organo-siloxane defoamer: 2 parts, aluminium triphosphate: 6 parts, polyamide wax pulp: 5 parts, 1-Methoxy-2-propyl acetate: 30 parts, water: 90 parts.
4. the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate according to claim 1, it is characterized in that, the preparation of described polyurethane modified acrylic resin, comprises the steps:
Preparation nucleus emulsion
Get the end NCO base polyurethane prepolymer for use as that 30 ~ 40 quality are divided, join in the water that 60 ~ 80 quality divide, stirring and evenly mixing, obtains nucleus emulsion;
Preparation shell emulsion
By the methyl methacrylate that 50 ~ 60 quality are divided, the β-dimethyl-aminoethylmethacrylate that 5 ~ 10 quality are divided, the vinylbenzene that 5 ~ 10 quality are divided, the emulsifying agent that 1 ~ 3 quality is divided and the water that 40 ~ 50 quality are divided mixing, stir, emulsification, obtains shell emulsion;
Preparation polyurethane modified acrylic resin
Get reaction flask, the water that 30 ~ 40 quality are divided is added in bottle, the initiator that 1 ~ 5 quality is divided, the emulsifying agent that 1 ~ 3 quality is divided, the buffer reagent that 0.5 ~ 2 quality is divided, stirring and evenly mixing, then described nucleus emulsion is added, add after being warming up to 70 ~ 80 DEG C, insulation 40 ~ 60min, then in described reaction flask, shell emulsion is dripped, at the uniform velocity drip, dropwise in 1.5 ~ 2h, wherein, when shell emulsion surplus is 1/5 ~ 1/3, add the reductive agent that 0.5 ~ 2 quality is divided, after shell emulsion dropwises, at 75 ~ 80 DEG C, insulation 1 ~ 1.5h, be cooled to room temperature, filter to obtain described polyurethane modified acrylic resin.
5. the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate according to claim 4, it is characterized in that, described step 2) and step 3) in emulsifying agent be selected from one in oxyethyl group phenolic ether ammonium sulfate, polyoxyethylene nonylphenol ether, allyl ethers hydroxypropyl azochlorosulfonate acid sodium.
6. the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate according to claim 4, is characterized in that, step 3) described in initiator be one in Diisopropyl azodicarboxylate, peroxidation two acyl, persulphate.
7. the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate according to claim 4, is characterized in that, step 3) described in buffer reagent be selected from one in sodium hydrogen phosphate, Sodium phosphate dibasic and sodium bicarbonate.
8. the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate according to claim 4, is characterized in that, step 3) described in reductive agent be sodium sulfate salt or sodium hypophosphite.
9. the acrylic resin modified energy-saving and environment-friendly paint of a kind of antitheft door door-plate according to any one of claim 1 ~ 8, it is characterized in that, described coating is coated to antitheft door door-plate steel slab surface by roll coating model, roller coat temperature 230 ~ 240 DEG C, and roller coat number of times is 1 ~ 2 time.
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