Coating process: UV curing vacuum coating

Core tips: 1 Introduction The uv-89 UV curing vacuum coating developed in this paper is a technical update of the traditional heating drying vacuum iron film coating It has the characteristics of rapid curing and excellent performance The product quality has reached and surpassed the level of similar products in Japan In recent years, with the development of economy, plastics (ABS, GRP, rim, EPPM, polyurethane, nylon) are widely used in automobile, household appliances, daily packaging, process decoration and other industrial fields as engineering decorative structural materials For the surface decoration of basket lifting plastic products, Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Home of coatings: 1 introduction the uv-89 UV curing vacuum coating developed in this paper is a technical update of the traditional heating drying vacuum iron film coating It has the characteristics of rapid curing and excellent performance The product quality has reached and surpassed the level of similar products in Japan In recent years, with the development of economy, plastics (ABS, GRP, rim, EPPM, polyurethane, nylon) are widely used in automobile, household appliances, daily packaging, process decoration and other industrial fields as engineering decorative structural materials In order to improve the surface decoration of the basket plastic products and make them have the effect of metal feeling like gold, silver, copper, etc., the methods of vacuum evaporation and vacuum sputtering are usually used in industry to produce a layer of shiny metal film on the surface of the plastic substrate However, the vacuum plated metal film must be protected by primer and top coating to improve its gloss, adhesion, wear resistance, weather resistance and other physical and chemical properties For the bottom and surface coating of vacuum coating, solvent volatile coating is often used in industry for decorative protection, such as nitro coating, acrylic resin coating, urethane oil, vinyl resin coating, etc However, these coatings have low luster, poor fullness, long drying time, poor adhesion to plastics, low hardness and poor wear resistance Especially in the mildewy season and when the humidity of construction environment is over 85%, the coating is easy to turn white, with low yield and short service life Thermoplastic plastics have a certain thermal deformation temperature, some plastics such as polystyrene are easy to be eroded by solvents Therefore, the variety of coatings that can be applied is limited In conclusion, we have studied and practiced the coating of vacuum coating Uv-89 vacuum coating is UV curing vacuum coating It has good glossiness, fullness, fast drying, firm adhesion to plastic, and makes the coating smooth and shiny It is an ideal coating for plastic vacuum coating decorative coating 2uv-89a vacuum coating primer according to the characteristics of the vacuum coating of plastics, the following technical requirements should be carried out first: the primer should not only have good adhesion with the plastic substrate, but also with the vacuum coating (aluminum, copper); the primer has good leveling, fullness, high gloss and hardness; the primer can adapt to the temperature and humidity changes of the construction environment The primer can be cured and dried quickly (30s) by domestic UV lamp We have studied uv-89a uv-89a vacuum coating primer based on polyurethane and acrylate 2 Experimental part 2.1.1 composition level; auxiliaries: polymerization inhibitor, catalyst, leveling agent, initiator, antioxidant and other industrial level; 2.1.2 in the synthesis process, the specified amount of toluene diisocyanate, polymerization inhibitor, catalyst and diluent are added into the reactor, and the hydroxypropyl ester and catalyst are placed in the dropper, which is heated slowly and the temperature is controlled at 50 ~ 60t The temperature is stable After lmin, the dropper is opened for dropper, and the temperature is controlled at 60~ 70, dropping time 2 h after dropping, raise the temperature to 90 ± 2 ° C, keep the temperature for 3 h, measure the isocyanate, cool to 65 after passing the test, then add ethanol, keep the temperature at 60, keep the temperature for 3 qmin, then add styrene, active monomers and additives, after mixing, use 400 self filter cloth to filter and put into the packaging container when the temperature is below 50t 2.1.3 technical performance uv-89a vacuum coating primer is a single component acrylic polyurethane coating formed by the reaction of isocyanate and hydroxyl of acrylic monomers It is prepared by reaction under heating conditions with polymerization inhibitor, catalyst, leveling agent and other additives Its active diluents are generally styrene, acrylic monomers, N-vinyl pyrrolidone, vinyl monomers, etc The acrylate with multi-functional group is a cross-linking agent Due to the use of vinyl containing active monomers, the coating has a strong sensitivity to light, and the coating can be quickly crosslinked and solidified into a film after 20 s of UV irradiation The acrylic ester with multi-functional groups is used as crosslinking agent in the primer to enhance the binding force with the plastic substrate and the vacuum coating layer, so that the drying speed and binding force of the uv-89a vacuum coating primer can reach the technical standard of the UV curing coating in Japan 3uv-89b vacuum coating - 4001 surface coating is studied The main content is to solve the binding force between the surface coating and the coating layer (aluminum, copper) With epoxy acrylate as the main film-forming material, the scheme of uv-89b vacuum coating is determined 3.1 the experimental part 3.1.1 is composed of industrial grade butyl methacrylate; auxiliaries (polymerization inhibitor, catalyst, antioxidant, leveling agent, coupling agent, initiator) Comparison of technical indexes between domestic uv-89a primer and Japanese UV primer, domestic uv-89a primer with a daily appearance of yellowish transparent, colorless, transparent, viscosity, solid content, adhesion (cross cut method), pencil hardness, recoating ability, recoating and storage period of half a year table 2 domestic uv-89 primer film Performance item technical index: the appearance of the paint film is smooth, bright and glossy, the adhesion (cross cut method) hardness is more than 4h, and banana water is resistant In Min 3.1.2 synthesis process, the epoxy resin and antioxidant are put into the reactor, and the acrylic acid, polymerization inhibitor and catalyst are placed in the drop feeder When the temperature of the reactor rises to 90t, open the trickling device for trickling The temperature is controlled within 100t, and the trickling time is about 3H During the trickling, pay attention to exothermic reaction After the trickling, the temperature is controlled within the lot Heat preservation for 3 ~ 4h, after the acid value is tested to be qualified, cool the temperature to below 80t, add styrene, butyl methacrylate, active monomer and other additives, stir for 15min, and then filter and pack with 400 mesh filter cloth when it is below 50t 3.1.1 technical performance uv-89b vacuum coating is prepared by the reaction of epoxy group and (meth) acrylic acid The combination, flexibility and chemical resistance of epoxy resin are good, and the cured coating also shows this characteristic Generally, the epoxy resin with medium activity constitutes a rapid curing system In most applications, a considerable amount of active diluent or low viscosity prepolymer must be added to achieve a reasonable construction viscosity Epoxy reacts with acid to form hydroxyl group, which improves the adhesion Acrylate active monomers are used as crosslinking agent in the surface coating, which solves the problems of the adhesion between the surface coating and the coating (aluminum, copper), as well as the hardness and flexibility of the coating The performance of uv-89b vacuum coating can reach that of UV curing coating Domestic UV-89B surface coating and Nissan UV surface coating performance comparison of varieties of Nissan UV surface coating project surface appearance slightly yellow, light brown, light brown, transparent liquid viscosity solid content, lacquer luster and aluminum film binding force qualified hardness, salt spray qualified, resistant to banana water qualified eleven, drunk qualified storage period of half a year 1 annual table 4 daily production UV-89B surface coating film performance project technical indicators appearance smooth, glossy gloss Adhesion (cross cut method), hardness, salt spray (3% NAD), fragrance and thin water, min 4 construction process and precautions 4.1 construction process 4.1.1 plastic surface pretreatment (degreasing cleaning, drying, electrostatic dust removal) 4.1.2 spraying uv-89a vacuum coating primer construction temperature and humidity 1 ~ 30, especially 60 ~ illumination time: 30s 4.1.3 irradiating under ultraviolet light for 30s 4.1.4 vacuum aluminum or copper plating 4.1.5 construction viscosity of spraying uv-89b vacuum coating (25 coating 4): 13 ~ light wavelength: 365nm light irradiation time: 3 light curing power: 80W / cm, distance: 15cm 4.1.6 under ultraviolet light irradiation for 3S 4.1.7 inspection and packaging 4.2 precautions: the viscosity of uv-89 bottom and surface coating must be adjusted and special diluent must be used; before uv-89 bottom and surface coating is illuminated, it is better to level 3-5rnin under infrared light or normal temperature, and then it can be processed under ultraviolet light; according to the amount of coated materials, the ingredients shall be correctly proportioned according to the proportioning requirements, and after mixing evenly, it must be filtered by 3-400 mesh screen; after the material is proportioned, it shall be left standing for 15 minutes~ 30 minutes before use The prepared paint should be used up within 24 hours; 4) the spraying tools and equipment shall not be stained with oil, water and other dirt Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,