The preparation and construction process of high-gloss, high-hard water wood paint

With the pressure of environmental protection policy, consumer awareness of environmental protection continues to rise, especially in various provinces and cities across the country issued VOC emission limits and charging standards, to encourage furniture enterprises to use non-solvent-based coatings, to the development of water-based environmental protection coatings has brought opportunities. Although traditional coatings still occupy a larger market share, but water-based paint is a green industry, is the future direction of lacquer, domestic water-based paint leading enterprises are rising. The development of water-based coatings and the market share is increasing year by year is an indisputable fact, and there is a tendency to speed up. Some enterprises have realized the broad market potential of water-like paint, have developed, entered, expanded the water-like paint market.
Although water-based coatings are superior to traditional paints in terms of environmental performance, water-based coating products have defects such as difficult construction, poor water resistance, easy-to-expose skin, poor plumpness and poor hardness. Oily paint is still the paint of choice when decorating furniture because of its strong hardness, good paint film plumpness and convenient construction. Only when physical performance deficiencies are addressed, even beyond traditional oily paints, will consumers be more proactive in choosing to use water-based coatings. Only in environmental protection performance to meet consumers, in the construction process, decorative effects can not meet consumers, water-based coatings market is still difficult to open. This requires water-based paint manufacturers to do technological innovation in water-based paint performance.
Although water-based wood coatings are recognized as environmentally friendly coatings, but the existing technology of water-based paint there are still many problems, such as low hardness, poor adhesion, water easy to whiten, poor physical performance of the coating, expensive, therefore, ordinary water-based paint and solvent-based paint in the cost-effective there is still a large gap.
the development and production of high-gloss, high-hard water- At present, the production of single-component water-based wood paint on the market, mainly using self-linked water-based acrylic latex synthetic materials, the main advantages of the products produced are good environmental protection, low price, but the fatal disadvantage is low hardness (≤2B), easy scratching, poor water resistance, water-resistant easy to whiten, resistant to water Poor heat, heat easy to stick, can only be used as a general lower requirement, service life does not require low-grade wood furniture decoration use, there are also the use of hydroxypropyl acrylic emulsion and polyurethane cross-linked two-component wood furniture paint and water-based polyurethane as raw materials of the two-component wood furniture paint. With these two resins as raw materials composed of two sets of wood furniture paint in the comprehensive performance than the original single-part lotion type wood paint has a greater improvement, such as hardness can reach HB, heat resistance, water resistance has also improved, but still can not reach solid wood furniture decoration High hardness ≥H, high gloss≥90, high wear resistance, high toughness, high water resistance, boiling water hot not white, non-stick, constant color, high durability and other requirements for lacquer film.
water-based paint to meet the above performance requirements, the use of the current market for film-forming materials, only by adjusting additives to solve the problem can not meet the above-mentioned performance requirements, so it is necessary to break through the technical bottleneck in film-forming materials. Because acrylic resin compared with other resins has excellent weather resistance, yellow denaturation, so it is a wood furniture paint preferred film material, but the current market supply of hydroxypropyl acrylic resin is mostly produced using acrylic latex synthesis process, due to the presence of emulsifiers, the final production of water-based wood paint paint coating film comprehensive performance by emulsifiers, so can not be used as high-grade water Wood paint preferred film material, for this reason, our company uses its own technical strength, the use of intellectual property rights belong to my company's invention patent - hydroxypropyl acrylic acid (no emulsifier) secondary dispersion synthesis process technology production of hydroxypropyl acrylic resin dispersion as a film material of water-based wood paint, because of the resin dispersion liquid it has a lower molecular weight and a narrower molecular weight distribution, appropriate hydroxy content. Curing agent selection is easier to disperse in water, hand stirring good use of polyether modified or amino sulfonate modified hydrothermical isocyanate as a cross-linking agent, the use of hydroxypropyl acrylic resin and isocyanate curing agent cross-linked formation of the mesh structure, to provide excellent physical properties and paint film high permeability. Mesh structures of different densities exhibit different hardness and mechanical strength and chemical resistance, and the final water resistance and other physical properties of the paint film are not the same. Due to the different performance requirements of different wood material furniture on the paint film, flexible selection of different hydroxy content of acrylic resin and with different properties of isocyanate curing agent, to achieve the best cost-effective water-based paint, to meet a variety of wood material decoration requirements.
Our company with the resin dispersion to produce water-based paint, paint film in addition to acrylic resin unique anti-aging, weather resistance, yellowing resistance and good mechanical properties, because there is no emulsizer, paint film with high light (≥90), high hard (≥H), more permeable, good wood-printed occlicity and so on.
products by the National Construction Materials Quality Supervision and Inspection Center testing, to meet and exceed the national GB /T23999-2009 specified technical indicators, of which the hardness index ≥H (with the national inspection and testing report Figure 1).
Tutu-1
Table below shows that Taicang Jinqiang Furniture Co., Ltd. sprayed three pieces of paint on imported white wax wood under the same spraying conditions with the well-known two-part water-based paint comparison data, There is not much difference in the test of dense, bend-resistant, plumpness and other indicators, the most obvious differences are shown in hardness and gloss, the well-famous two-part water-based paint film hardness ≥H, gloss>90.

well-known water painta well-known foreign branda well-known domestic brandoriginal viscosity 100sec 95sec 105secgloss95 85 83HardnessHBHB HB tightness 100% 100% 100%bend resistance< 2mm < 2mm <2mm plumpness▔effect ▔ 0▔ ▔flow-hanging 0▔heat resistance no traces micro-whitemicro-white White repressive pressure no there arethere are five hot and cold cycles throughthroughnotwater-resistant two-part construction process and drying methods
1, white model production process
1.1 model each plate surface painted water-based stereotyped water (water-based closed primer)
1.2 scratched white water-based putty
1.3 sprayed 2 times water-based white primer
1. 4 spray 1 to 2 times water-based white paint
white model production process2, white with gold and silver pattern pattern model production process
2.1 all sides painted water-based stereotyped water (water-based closed primer)
2.2 thin spray water White primer over and over
2.3 thin spray-water white paint over and over again
2.4 painted water-water-water gold, silver Grace
2.5 sprayed 1 to 2 times water-water varnish
white with gold and silver pattern pattern making process
3, open color paint model production process
3.1 all sides painted water-based stereotyped water (water-based closed primer)
3.2 spray water-based color background color again
3.3 spray water-based primer once
3.4 Painted water personality Liz
3.5 sprayed varnish once
3.6 water-based finish
3.7 sprayed water-based paint twice
open-color paint model Production process
4, closed color paint model production process
4.1 all sides painted water-based stereotyped water (water-based closed primer)
4.2 spray water-based color background color again
4.3 sprayed Water-quality varnishes once
4.4 Wipe high-fill water character Liz
4.5 Sprayed water-like varnishes once
4.6 water-color finished
4.7 Sprayed water-quality bottoms Paint twice
4.8 sprayed water-like varnish twice
closed color paint model production process
II, water-like paint drying method and application water-like paint in the application of coating, drying technology is a big bottleneck. There are many drying methods of water-based paint, different drying methods on the drying speed of water-based paint and film quality has obvious differences, water-based paint if the high temperature or humidity of the situation of construction, the coating is prone to whitening and peeling, drying speed is slow. In low temperature construction, drying speed is very slow, especially at 5 degrees C, water-based coatings are more difficult to form a film. These are important reasons to limit the popularization and application of water-based coatings. Here is a brief introduction to several drying methods of water-based coatings:
1, hot air drying
hot air drying is the use of conve current principle, the temperature of 35 to 60 degrees C of hot air as the heat carrier, heat energy to the surface of the workware coating, the coating absorbs energy after curing into a membrane heating and drying method. Commonly used electricity or steam as a heat source, the air is heated first, heat is transmitted by conflowation from the hot air to the surface of the coating, so that the coating is quickly dried. The use of hot air drying process, can obviously speed up the coating drying speed, and has adaptable characteristics, is a more common application of drying methods.
2, microwave drying
microwave refers to the wavelength of 1mm-1m, frequency 300MHz-300GHz, penetrating electromagnetic waves, commonly used microwave frequency of 915-2450MHz.
microwave field with hundreds of millions of times per second of high-speed periodic changes plus the direction of the electric field, so that the water molecules swing rapidly, resulting in a significant thermal effect, so that the temperature inside and outside the coating at the same time rapidly increased, so that the paint coating moisture evaporates rapidly, microwave heating advantage is particularly fast drying speed, the dry object has no shape requirements.
3, UV
water-based UV wood coating, can use UV curing drying.
In water-based UV coatings contain a small amount of photosensitive agents, in the light of ultraviolet light, photosensitive agents absorb a specific wavelength of ultraviolet light, the production of active groups, triggering the polymerization of film-forming substances, forming a mesh structure and so that the coating curing. Ultraviolet curing has the characteristics of fast coating curing speed and good coating quality.
4, infrared drying
the so-called infrared curing actually refers to the coated furniture plate and its coating in infrared exposure, absorbing radiant energy and converted into heat energy, thus completing the curing of the coating. Infrared is an invisible ray between visible light and microwaves with a wavelength of 0.72-1000um. According to the wavelength range, can be divided into "near", "medium" and "far" infrared, commonly used far infrared drying coating, infrared curing has the advantages of fast curing speed, heating speed, curing quality and so on.
a variety of drying methods, the author believes that each has advantages and disadvantages. Ultraviolet drying method can only be used to dry water-based UV coating, infrared heating drying method, heating when the coating has a clear temperature gradient, its drying is extended from the outside to the inside, which makes it not suitable for drying thick coating film. Moreover, UV and infrared drying methods are only suitable for dry flat-panel furniture plates. Microwave drying technology is a technology-leading drying method, fast drying speed, high production efficiency, but large investment, and easy to work mechanical and electrical failures, affecting work efficiency. Although there is no appearance requirement for drying objects, but because the material of drying objects is not the same, thickness and coating area is not the same, so the drying process of all parts of the surface temperature is not the same after heat, so the operation control requirements are higher, control is not good, furniture local paint film overheating easy to appear such as cracking, foaming, peeling, deformation and other problems.
Because the resin of the famous water-based paint is a secondary dispersed hydroxypropyl acrylic dispersion, it has the characteristics of oily resin, so the performance of the same oily paint has many similar characteristics, in addition to high-gloss (≥90), hardness starts fast, after 48 hours of dry hardness Can reach H, paint film after 24 hours of boiling water pouring on the same color, not only suitable for high-gloss high-hard solid wood furniture surface decoration, the same applies to matte and fast-drying industrial wood and furniture coating, and has the same oily paint as easy to construct characteristics, fully comparable with oily paint.
well-famous water-based wood paint in many furniture companies after the application, generally reflects low-temperature construction stability, good film-forming, fast drying speed, in 35 degrees C drying conditions after 40 minutes of good polishing performance. Therefore, in addition to large enterprises with microwave drying conditions, other furniture production enterprises assembly line as long as there is hot air drying heating device, or appropriate in the assembly line equipped with several dehumidifiers or with dehumidification function of the dry room, to dry temperature control 35 to 40 degrees C, it has the construction conditions. The operation and use of the water-based two-part wood coating is as simple and convenient as the oily coating (optimal construction conditions, spraying site operating temperature at 15 to 30 degrees C, humidity <60 degrees C, to-dry temperature 35 to 40 degrees C). Construction personnel do not need to change their construction habits can get started, in the actual construction application, greatly reduce the cost of training.
。