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400-667-1898
400-667-1898
Common wood paint in six categories, namely the nitro coating (NC), polyurethane coating (PU), unsaturated polyester coating (UPE), ultraviolet curing coatings (UV), acid curing coating (AC) and aqueous coating (w). Among the top three is based on the film forming matter to name, UV, AC two is the basis of its curing conditions to name, W coating is because of water as a solvent or dilution medium, which is different from all the use of organic solvents "solvent based paint" and was named "water paint".
1 nitro paint (NC)
Overview: nitro paint or nitrocellulose coating or NC coating, the main raw material is the nitro cellulose.
Advantages: nitro coating has a series of excellent physical and chemical properties, one is the surface dry quickly, nitro paint belongs to the volatile drying paint, depending on the solvent evaporation to make coating curing film, NC film coated after solvent, it completely volatile, film is hard work. It is under the condition of normal temperature only needs l0-15min to surface dry, so between the two finishing time is greatly shortened. The two film easy to repair after damage, nitro coating belongs to reversible coating, which coating completely hard work can still be the original solvent, so when the film is damaged easily when repair and the original basic consistent, do not see signs of repair. Three is the coating decorative coating with excellent performance, light color, high transparency, hardness and wear resistance, good mechanical strength and certain water resistance and corrosion resistance, coating is widely used in high-grade furniture, musical instruments, handicrafts and other senior. Four is the construction is very convenient, can brush, can also be sprayed, dipping, roller coating, and the coating can be used for a long time, not easy metamorphism, scrap, sealing preservation can be used repeatedly.
Disadvantages:of course, compared with other paint, nitro coating heat resistance, cold resistance, light resistance, alkali resistance is poor, is easy to damage in the process of using, the paint itself solid and low, after the construction has a large number of harmful gas volatilization pollution of the environment, these adverse factors will restrict the development of. In the field of furniture, nitro paint is currently used mainly for American painting series products, one of the most important varieties are also Jiezhuang paint.
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2 polyurethane coating (PU)
Overview: the polyurethane coating is refers to the paint film after film contains considerable amounts of ammonia ester bond (-NHCOO-) coating, also known as PU coating. The two-component polyurethane coating is at present our country market the main wood paint one species, which is isocyanate and hydroxyl occur chemical reaction film forming mechanism. Commercially available double component polyurethane coatings are generally classified as main agent and curing agent and diluent three components, wherein the main agent is all kinds of resin with Taiwan hydroxyl groups of the compounded curing agent is containing isocyanate prepolymer resin. When in use, the main agent and curing agent in paint manufacturers required mixing ratio, adding diluent construction viscosity adjustment amount, can painting.
Advantages:because the polyurethane coating dry film occurs when a chemical reaction, so it has some common essential hair coating can not compare with excellent performance. One is the mechanical properties, excellent adhesion to the substrate surface, all kinds of wooden tough film, high hardness, have very good flexibility, so it has high resistance to abrasion and impact resistance. Two chemical properties: curing is not easy to be solvent to dissolve, chemical resistance, excellent anti pollution. The film is not easy to soften the paint film is heated, weatherability, lasting good performance. Three is a good decoration performance: the film transparency, fullness and excellent gloss and color retention.
Disadvantages: of course, compared with other coatings, coating quality polyurethane coatings by the construction conditions and environmental impact of large, mainly displays in: the main agent and curing agent ratio have strict requirements, if improper ratio significantly affect the performance of the final film; easy foaming spray in the process of construction; the use of aromatic curing agent, dry film prone to yellow; heavy coated to note the time interval between layers, should be uniform grinding re painted before, otherwise it will affect the adhesion of coating; in addition, free isocyanate trace coating (TDI) is toxic to humans, to a certain extent the construction personnel healthy body, and environment pollution coating.
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3 unsaturated polyester coating (UPE)
Overview: unsaturated polyester paint, also known as UPE coating, refers to the unsaturated polyester resin as the main film-forming material coating, chemical properties of excellent comprehensive material. Because this type of paint used in the reactive diluent is unsaturated monomers (such as styrene), which can be used as a solvent for dissolving unsaturated polyester, as diluent to adjust the consistency of effect, but also can in the painting as active monomer participate in unsaturated polyester reaction, curing film, so UPE is a solvent-free paint, one can become thick film coating, high solid, wood used in coating is particularly suitable for the primer, can make the finish exhibits high fullness. It is because of these advantages, UPE paint in recent years in the wood used in the field of considerable development.
Advantages: unsaturated polyester coating is a kind of multi-component coating, commercially available UPE paint coatings including principal agent (unsaturated polyester resin based), initiator (commonly known as white water), accelerator (commonly known as the blue water) and diluent. The main agent is generally polyester resin containing a certain amount of unsaturated dicarboxylic acid and some special monomers (such as styrene, allyl ether) mixture; white water is usually refers to various kinds of peroxide and hydrogen peroxide compound solution, they can decompose into free radicals participate in chemical reactions; there are also many types of blue water, is usually some naphthenic acid salt. Unsaturated polyester paint curing is the basic principle of initiator and promoter response after the first decomposition generates free radicals, caused the unsaturated resin double bond on free radical reaction, the final cross-linking curing membrane. The role of promoter is accelerated initiator decomposition, accelerating the reaction rate.
Disadvantages: unsaturated polyester paint has many excellent properties, manifested in: UPE coating generally do not contain volatile solvent ordinary, does not release a lot of harmful gas, no pollution to the environment; a construction can get thicker film; but under the condition of normal temperature drying; film fullness, high hardness, gloss of higher. The deficiency is unsaturated polyester paint film shrinkage, after the film coating is generally more brittle, easy to crack; wood substrate processing requirements strictly, otherwise affect adhesion; with a good coating can use time is short, the operation time is short; in particular, blue, white water a large amount of direct contact is very dangerous flammable, explosive, therefore, blue, white water must be stored separately, and according to the requirements of the right to use, otherwise easy to cause explosion and fire.
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4 ultraviolet curing coating (UV)
Overview: the UV curing coating, also known as the UV coating, through the ultraviolet irradiation of wet film, caused by free radical reaction, so a kind of fast dry coatings film. UV paint main film-forming substance with unsaturated polyester resin, acrylic epoxy resin and acrylic polyurethane resin, adding a certain amount of photoinitiator, polymerization inhibitor, additives, low viscosity reactive monomers, pigments and fillers blended.
Advantages: because the UV coating solid nearly 100%, a HISTEP film thickness, containing organic solvent is few, little pollution to the environment; quick drying, convenient mass production, and the coating use Yi fee low loss, reduce the coating operation space; high hardness of paint film, with excellent resistance to dissolution of Jing, drug resistance character, frictional resistance etc..
Disadvantages: of course, UV coating is used, one is in the coloring process to choose a coloring agent, avoid the ultraviolet light irradiation fade and paint yellowing situation; two is the film interlayer recoat needs fully polished, otherwise it will produce adhesion adverse situation; three is the UV coatings have the stimulation to the human body, long-term acceptance of UV irradiation is Tuzhuang will affect the personnel health, to strengthen the safety protection measures. In addition, UV coating is usually adopts roller coating or Lin Tu, more suitable for large flat
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5 acid curing coating (AC)
Overview: acid curing, referred to as AC coating, the general use of mixed amino resin and alkyd resin and into the main paint, used when adding organic acid (such as p-toluene sulfonic acid) as catalyst (catalyst), can make the reaction at room temperature dry film.
Advantages: acid curing coatings has a series of excellent physical and chemical properties, fast drying, the coating film of the finished after full transparency and smooth, high gloss, high hardness, tough, strong adhesion, high mechanical strength, and heat resistance and cold resistance, water resistance, oil resistance, chemical resistance properties of certain goods. Acid curing coatings for wood furniture painting, in northern Europe and Southeast Asia with more common.
Disadvantages: its disadvantage is that the coatings contain free formaldehyde, taste, strongly stimulate the operator eye nose, while the coating with acidic, easy corrosion metal substrate.
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6 aqueous coating (W)
Overview: water-based paint refers to paint with water as the dispersion medium, generally divided into emulsion and water-soluble two categories, which are widely used in water emulsion. The main varieties of emulsion type with polyurethane dispersion (PUD), pure acrylic emulsion (PA), acrylic polyurethane emulsion modified (PUA), packaging is divided into one component, two-component. Water wood paint resin currently used are mainly water soluble alkyd, acrylic emulsions or dispersions, polyurethane aqueous dispersion, aqueous acrylic polyurethane dispersions, two component waterborne polyurethane dispersion, with the resin and paint with water, thickening agent, additives and adjusting system.
Advantages: convenient for waterborne coating paint, construction period is long, easy to repair, basic safety non-toxic, flexibility of paint film, good adhesion. Especially with the national environmental protection laws and regulations to restrict VOC, enhancement of people's environmental protection consciousness and the health consciousness, solvent based coatings have hitherto unknown challenge, waterborne coatings have received increasing attention. Of course, waterborne coating solid content is low, a thick coating can not be high, the film in the solvent resistance and character, heat resistance, film hardness and feel with the traditional NC, PU compared to a certain difference, price is also high, coating. But W and UPE, UV and so on, are the main direction of China coatings development.
Disadvantages: water-based paint film forming mechanism and solvent based coatings are consistent in principle, and is closely related to the connection material resin coating system choice, also has the volatile drying, heating and solidifying, combined curing, UV curing, but because there are special solvent "water-based paint water", make the the curing mechanism becomes more complicated. Such as water soluble polyurethane coatings, in the film forming process including the volatile matter (solvent, water) volatilization, polyol and polyisocyanate particles co condensation, polyisocyanate and water reaction, polyol and isocyanate reaction, these reactions will be accompanied by coating the entire process of drying.
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