A mother-of-pearl varnish with high resistance to yellowing and high translucency for wood and its application

Abstract

This invention discloses a mother-of-pearl varnish for wood products with high resistance to yellowing and high transparency, and its application. It consists of a main agent, a curing agent, and a diluent in a mass ratio of 100:(40-60):(10-20). The main agent includes: 40%-50% aldehyde-ketone resin, 0.1%-0.5% defoamer, 5%-10% liquid metallic pearlescent pigment, 1%-2% ultraviolet absorber, and 40%-50% diluent. The curing agent includes: 20%-30% HDI trimer isocyanate, 25%-35% isocyanate adduct, 30%-50% n-butyl acetate, 0-15% ethyl acetate and / or propylene glycol methyl ether acetate, and 0.1%-0.5% dehydrating agent. The product of this invention exhibits excellent resistance to yellowing, good film transparency, high brightness, strong shimmer, and a strong three-dimensional effect. It can be widely used for surface coating of wood products such as wardrobes, kitchen cabinets, bathroom cabinets, and display cases.

Description

Technical Field

[0001] This invention relates to a wood coating, specifically a mother-of-pearl coating for wood with high resistance to yellowing and high transparency, and its application. Background Technology

[0002] Mother-of-pearl paint is a high-end artistic paint. Its paint film surface presents a jade-like luster like a seashell and a three-dimensional effect that is highlighted on the seashell surface, like flowers or waves, layer upon layer. At the same time, it has a very smooth and delicate feel, hence the name mother-of-pearl paint. It is also called mother-of-pearl baked paint or crackle paint.

[0003] Mother-of-pearl paint is mainly used for surface coating of furniture products such as wardrobes, kitchen cabinets, and bathroom cabinets. For example, patent document CN105440917A discloses an easy-to-apply mother-of-pearl paint and its preparation method, which is composed of the following by mass fraction: 50-60% synthetic fatty acid resin, 0.1-0.2% leveling agent, 0.7-2% 1% silicone defoamer, 0.1-0.2% drying agent, 5-10% 20% CAB paste, 5-10% butyl acetate, 4-6% propylene glycol butyl ether acetate, 5-10% 125-mesh pearlescent powder, and 1-5% 30% transparent dye. All the above raw materials are added to a dispersion tank in the order of addition and then mixed and dispersed at high speed until uniform. However, current domestic pearl white mother-of-pearl paint products suffer from problems such as easy yellowing and poor translucency, failing to meet customers' demands for higher-end products. Summary of the Invention

[0004] This invention aims to provide a mother-of-pearl paint with high resistance to yellowing and high transparency for wood products and its application. It mainly solves the problems of poor resistance to yellowing and weak transparency of pearl white mother-of-pearl paint, so as to meet customers' needs for personalized and high-end coating effects.

[0005] To solve the above-mentioned technical problems, this invention achieves high resistance to yellowing and high transparency of pearl white mother-of-pearl paint through the selection of superior materials and reasonable formulation design.

[0006] The present invention provides a mother-of-pearl varnish for wood products with high resistance to yellowing and high transparency, characterized in that it is composed of a main agent, a curing agent and a diluent in a mass ratio of 100:(40-60):(10-20);

[0007] The main agent comprises the following components by mass fraction: 40%–50% aldehyde-ketone resin, 0.1%–0.5% defoamer, 5%–10% liquid metallic pearlescent pigment, 1%–2% ultraviolet absorber, and 40%–50% diluent;

[0008] The aldehyde-ketone resin is a neutral, non-saponifiable aliphatic aldehyde-ketone hard resin obtained by polycondensation reaction of aliphatic aldehydes with 7 to 9 carbon atoms with cyclohexanone, toluene, or / and acetone, with a number average molecular weight of 300 to 500 and a softening point of 80 to 95°C; for example, A-81 produced by BASF in Germany and CT-A81 produced by Jinan Changtai Chemical.

[0009] The defoamer is at least one of modified polysiloxane defoamer or modified polyether polymer solution, such as DEFOM 5300 from Hemings Dechen, BYK 141 and BYK 052N from BYK Chemical Company;

[0010] The liquid metal pearlescent pigment is a liquid metal pearlescent paste containing at least one metal element selected from aluminum, vanadium, manganese, tungsten, bismuth, and titanium, preferably bismuth oxychloride pearlescent paste; for example, Merck's L-100 and L-300 liquid metal pearlescent pastes;

[0011] The ultraviolet absorber is a benzotriazole ultraviolet absorber; the diluting solvent is at least one of n-butyl acetate, ethyl acetate, and propylene glycol methyl ether acetate.

[0012] The curing agent comprises the following components in the indicated mass fractions: HDI trimer isocyanate: 20%–30%, isocyanate adduct: 25%–35%, n-butyl acetate: 30%–50%, ethyl acetate and / or propylene glycol methyl ether acetate: 0–15%, and dehydrating agent: 0.1%–0.5%.

[0013] The HDI trimer isocyanate has a viscosity of 1500–3500 mPa·s at 23°C and an NCO content of 20%–30%; for example, WANNATE HT-100 from Wanhua Chemical Company.

[0014] The isocyanate adduct is prepared by addition polymerization of at least one of toluene diisocyanate with hexamethylene diisocyanate-based polyisocyanate, 1,6-diisocyanate hexane, and urethane-modified isocyanurate, followed by removal of free monomers by thin-film evaporation process, resulting in an isocyanate adduct with a solid content of 55%–65%, a viscosity of 200–600 mPa·s, and an NCO content of 10%–15%; for example, WANNATE 6861TH from Wanhua Chemical Company.

[0015] The dehydrating agent is a mixture of 70%–80% trimethyl orthoformate and 20%–30% oxazolidine by mass; for example, Samsung Chemical's FL-180 contains 75% trimethyl orthoformate and 25% oxazolidine.

[0016] The diluent comprises the following components by mass fraction: n-butyl acetate: 5%–30%, ethyl acetate: 60%–80%, and propylene glycol methyl ether acetate: 0%–20%.

[0017] The mother-of-pearl varnish for wood products described in this invention is prepared by conventional physical mixing methods, namely: mixing various materials evenly in proportion, dissolving and dispersing them evenly using a paint disperser, and then filtering.

[0018] The present invention also provides a method for applying a mother-of-pearl varnish with high yellowing resistance and high transparency for wood products, characterized by the following steps: (1) mixing the main agent, curing agent and diluent in a mass ratio of 100:(40-60):(10-20) evenly; (2) applying by spraying, first adjusting the spray gun to spray mode, and evenly spraying 1-2 crosses until the surface is uniform; then adjusting the spray gun to spray the paint in dots, and then evenly dripping 1-2 crosses onto the surface of the workpiece to form a pattern, and letting it dry at room temperature for 20-30 hours to obtain a mother-of-pearl patterned varnish film with high yellowing resistance and high transparency.

[0019] Compared with existing technologies, this invention abandons the use of synthetic fatty acid resin or nitro resin as the main resin material, and instead uses aldehyde-ketone resin as the main resin. The resulting paint film has good resistance to yellowing, high gloss, good transparency, and high fullness. The liquid metal pearlescent pigment with a unique crystal structure and high reflectivity is selected, which can better disperse the pearlescent pattern effect, and the pearlescent effect is bright white and has a strong shimmering effect. A certain amount of ultraviolet light absorber is added to further improve the yellowing resistance of the paint film. The matching curing agent is mainly a mixture of HDI trimer isocyanate and isocyanate adduct, which can better balance the drying and yellowing resistance of the paint film.

[0020] After undergoing a 100-hour QUV ultraviolet aging test, the mother-of-pearl paint of this invention exhibits a color difference ΔE value of <1, demonstrating excellent resistance to yellowing. The paint film exhibits good transparency, high brightness, and a strong shimmering effect, with patterns resembling layers of flowers and waves, creating a strong three-dimensional effect. Compared to existing pearl white mother-of-pearl paints, this invention solves the problems of poor yellowing resistance, weak shimmering effect, and poor three-dimensionality. This paint can be widely used for coating the surfaces of wooden products such as wardrobes, kitchen cabinets, bathroom cabinets, and display cases to meet the dual requirements of decorative and protective effects. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] The raw materials used in this embodiment are all commercially available products.

[0023] The aldehyde-ketone resin was A-81 from BASF, Germany; the defoamer was DEFOM 5300 from Hemings Dechian; the liquid metal pearlescent paste was L-100 from Merck; the ultraviolet absorber was EVERSORB EV-80 from E.K. Ltd., Taiwan; the diluents were butyl acetate, ethyl acetate, and propylene glycol methyl ether acetate from Jiangsu Yida; the HDI trimer isocyanate was WANNATE HT-100 from Wanhua Chemical; and the isocyanate adduct was WANNATE 6861TH from Wanhua Chemical.

[0024] Example 1

[0025] A pearl white mother-of-pearl paint with high resistance to yellowing and high transparency (pattern effect 1) is composed of a main agent, a curing agent and a diluent. (1) The main agent is: aldehyde-ketone resin: 50%, defoamer: 0.2%, liquid metal pearl paste: 10%, ultraviolet light absorber: 2%, diluent: propylene glycol methyl ether acetate: 20%, ethyl acetate: 10%, n-butyl acetate: 7.8%. First, add propylene glycol methyl ether acetate and n-butyl acetate to a clean container. Then, add the aldehyde-ketone resin while stirring at 300-500 rpm. Then, stir and disperse at 500-1000 rpm for 20-30 minutes until completely dissolved. Then, add the defoamer, pearl paste, ultraviolet light absorber and ethyl acetate respectively and stir until uniform.

[0026] (2) The curing agent is: HDI trimer isocyanate: 25%, isocyanate adduct: 30%, n-butyl acetate: 44.8%, and dehydrating agent: 0.2%. Add each component of the curing agent to the container in sequence, disperse at 500 rpm for 10 minutes until uniform, and then filter.

[0027] (3) The diluent comprises the following components by weight percentage: n-butyl acetate: 20%, ethyl acetate: 70%, propylene glycol methyl ether acetate: 10%. Add each component of the diluent to the container in sequence and disperse at 500 rpm for 5 minutes until uniform.

[0028] Construction method: (1) Mix the above main agent, curing agent and diluent in a mass ratio of 100:50:10 and stir evenly; (2) Use manual spraying construction. First, adjust the spray gun to spray mode and spray a cross evenly until the surface is uniform. Then adjust the spray gun to spray the paint into dots and then evenly drip a cross onto the surface of the workpiece to form a pattern. Let it dry at room temperature for 24 hours to obtain a mother-of-pearl pattern paint film with high yellowing resistance and high flash transparency.

[0029] Example 2

[0030] A pearl white mother-of-pearl paint with high resistance to yellowing and high transparency (pattern effect 2) is composed of a main agent, a curing agent and a diluent. (1) The main agent is: aldehyde-ketone resin: 50%, defoamer: 0.2%, liquid metal pearlescent paste: 8%, ultraviolet light absorber: 2%. The diluent is: propylene glycol methyl ether acetate: 20%, ethyl acetate: 12%, and n-butyl acetate: 7.8%. First, add propylene glycol methyl ether acetate and n-butyl acetate to a clean container. Then, add the aldehyde-ketone resin while stirring at 300-500 rpm. Then, stir and disperse at 500-1000 rpm for 20-30 minutes until completely dissolved. Then, add the defoamer, pearlescent paste, ultraviolet light absorber and ethyl acetate respectively and stir until uniform.

[0031] (2) The curing agent is: HDI trimer isocyanate: 25%, isocyanate adduct: 30%, n-butyl acetate: 44.8%, and dehydrating agent: 0.2%. Add each component of the curing agent to the container in sequence, disperse at 500 rpm for 10 minutes until uniform, and then filter.

[0032] (3) The diluent comprises the following components by weight percentage: n-butyl acetate: 20%, ethyl acetate: 70%, propylene glycol methyl ether acetate: 10%. Add each component of the diluent to the container in sequence and disperse at 500 rpm for 5 minutes until uniform.

[0033] Construction method: (1) Mix the above main agent, curing agent and thinner in a mass ratio of 100:50:11 and stir evenly; (2) Use manual spraying construction. First, adjust the spray gun to spray mode and spray two crosses evenly until the surface is uniform. Then adjust the spray gun to spray the paint into dots and then evenly drip two crosses onto the surface of the workpiece to form a pattern. Let it dry at room temperature for 24 hours to obtain a mother-of-pearl pattern paint film with high yellowing resistance and high flash transparency.

[0034] Example 3

[0035] A pearl white mother-of-pearl paint with high resistance to yellowing and high transparency (pattern effect 3) is composed of a main agent, a curing agent and a diluent. (1) The main agent is: aldehyde-ketone resin: 50%, defoamer: 0.2%, liquid metal pearlescent paste: 5%, ultraviolet light absorber: 2%, diluent: propylene glycol methyl ether acetate: 20%, ethyl acetate: 15%, n-butyl acetate: 7.8%. First, add propylene glycol methyl ether acetate and n-butyl acetate to a clean container. Add aldehyde-ketone resin while stirring at 300-500 rpm. Then, stir and disperse at 500-1000 rpm for 20-30 minutes until completely dissolved. Then, add defoamer, pearlescent paste, ultraviolet light absorber and ethyl acetate respectively and stir until uniform.

[0036] (2) The curing agent is: HDI trimer isocyanate: 25%, isocyanate adduct: 30%, n-butyl acetate: 44.8%, and dehydrating agent: 0.2%. Add each component of the curing agent to the container in sequence, disperse at 500 rpm for 10 minutes until uniform, and then filter.

[0037] (3) The diluent comprises the following components by weight percentage: n-butyl acetate: 20%, ethyl acetate: 70%, propylene glycol methyl ether acetate: 10%. Add each component of the diluent to the container in sequence and disperse at 500 rpm for 5 minutes until uniform.

[0038] Construction method: (1) Mix the above main agent, curing agent and diluent in a mass ratio of 100:50:10 and stir evenly; (2) Use manual spraying construction. First, adjust the spray gun to spray mode and spray a cross evenly until the surface is uniform. Then adjust the spray gun to spray the paint into dots and then evenly drip a cross onto the surface of the workpiece to form a pattern. Let it dry at room temperature for 24 hours to obtain a mother-of-pearl pattern paint film with high yellowing resistance and high flash transparency.

[0039] Example 4

[0040] A pearl white mother-of-pearl paint with high resistance to yellowing and high transparency (pattern effect 4) is composed of a main agent, a curing agent and a diluent. (1) The main agent is: aldehyde-ketone resin: 48%, defoamer: 0.2%, liquid metal pearl paste: 10%, ultraviolet light absorber: 2%. The diluent is: propylene glycol methyl ether acetate: 22%, ethyl acetate: 10%, and n-butyl acetate: 7.8%. First, add propylene glycol methyl ether acetate and n-butyl acetate to a clean container. Then, add the aldehyde-ketone resin while stirring at 300-500 rpm. Then, stir and disperse at 500-1000 rpm for 20-30 minutes until completely dissolved. Then, add the defoamer, pearl paste, ultraviolet light absorber and ethyl acetate respectively and stir until uniform.

[0041] (2) The curing agent is: HDI trimer isocyanate: 22%, isocyanate adduct: 35%, n-butyl acetate: 42.8%, and dehydrating agent: 0.2%. Add each component of the curing agent to the container in sequence, disperse at 500 rpm for 10 minutes until uniform, and then filter.

[0042] (3) The diluent comprises the following components by weight percentage: n-butyl acetate: 25%, ethyl acetate: 65%, propylene glycol methyl ether acetate: 10%. Add each component of the diluent to the container in sequence and disperse at 500 rpm for 5 minutes until uniform.

[0043] Construction method: (1) Mix the above main agent, curing agent and thinner in a mass ratio of 100:52:10 and stir evenly; (2) Use manual spraying construction. First, adjust the spray gun to spray mode and spray a cross evenly until the surface is uniform. Then adjust the spray gun to spray the paint into dots and then evenly drip a cross onto the surface of the workpiece to form a pattern. Let it dry at room temperature for 24 hours to obtain a mother-of-pearl pattern paint film with high yellowing resistance and high flash transparency.

[0044] Comparative Example 1

[0045] Comparative Example 1 is the white mother-of-pearl paint product currently used by the customer, brand "Shuxiong"; Comparative Example 2 is the white mother-of-pearl paint product purchased from the market, brand "Tianmai". Examples 1-3 and Comparative Examples 1-2 were sprayed onto panels to form paint films. Tests were conducted according to relevant standards such as GB / T23997-2009 "Solvent-based Polyurethane Wood Coatings for Interior Decoration and Renovation" and GB 18581-2020 "Limits of Hazardous Substances in Solvent-based Wood Coatings for Interior Decoration and Renovation Materials". The test data are listed in Table 1.

[0046] Table 1 Test results of Examples 1-3 and Comparative Examples 1-2

[0047]

[0048] As shown in Table 1, the paint films of Examples 1-4 exhibit excellent resistance to yellowing. After 100 hours of QUV yellowing resistance testing, the ΔE value was less than 1 for all examples, and their transparency, shimmer, and three-dimensional texture were significantly better than the two comparative examples. The amount of pearlescent paste added has a certain impact on the paint film effect. Examples 1-3 showed the following: higher addition resulted in poorer yellowing resistance and shimmer, but slightly better three-dimensional texture; lower addition resulted in slightly better yellowing resistance, slightly worse shimmer, and poorer three-dimensional texture. The pearlescent paste addition in Examples 1-4, at 5%-10%, resulted in paint films with better shimmer and three-dimensional texture than the two comparative examples, which can solve the problems of poor yellowing resistance, weak shimmer, and poor three-dimensional texture in existing general pearl white mother-of-pearl paint products.

Claims

1. A mother-of-pearl lacquer for woodwork with high resistance to yellowing and high translucency, characterized in that, It consists of a main agent, a curing agent, and a diluent in a mass ratio of 100:(40-60):(10-20); The main agent comprises the following components by mass fraction: 40%–50% aldehyde-ketone resin, 0.1%–0.5% defoamer, 5%–10% liquid metallic pearlescent pigment, 1%–2% ultraviolet absorber, and 40%–50% diluent; the aldehyde-ketone resin is A-81 from BASF, Germany; and the ultraviolet absorber is a benzotriazole-based ultraviolet absorber. The curing agent comprises the following components in the indicated mass fractions: HDI trimer isocyanate: 20%–30%, isocyanate adduct: 25%–35%, n-butyl acetate: 30%–50%, ethyl acetate and / or propylene glycol methyl ether acetate: 0–15%, and dehydrating agent: 0.1%–0.5%. The isocyanate adduct is WANNATE 6861TH from Wanhua Chemical Company; the liquid metal pearlescent pigment is bismuth oxychloride pearlescent paste.

2. The mother-of-pearl varnish for woodwork with high resistance to yellowing and high translucency as described in claim 1, characterized in that, The defoamer is at least one of modified polysiloxane defoamer or modified polyether polymer solution; the diluent is at least one of n-butyl acetate, ethyl acetate and propylene glycol methyl ether acetate.

3. The mother-of-pearl varnish for woodwork with high resistance to yellowing and high translucency as described in claim 1, characterized in that, The HDI trimer isocyanate has a viscosity of 1500–3500 mPa·s at 23°C and an NCO content of 20%–30%.

4. The mother-of-pearl varnish for woodwork with high resistance to yellowing and high translucency as described in claim 1, characterized in that, The dehydrating agent is a mixture of 70%–80% trimethyl orthoformate and 20%–30% oxazolidine by mass.

5. The mother-of-pearl varnish for woodwork with high resistance to yellowing and high translucency as described in claim 1, characterized in that, The diluent comprises the following components by mass fraction: n-butyl acetate: 5%–30%, ethyl acetate: 60%–80%, and propylene glycol methyl ether acetate: 0%–20%.

6. The method of applying the mother-of-pearl varnish with high resistance to yellowing and high translucency for woodwork according to any one of claims 1 to 5, characterized in that, The construction method includes the following steps: (1) Mix the main agent, curing agent and diluent at a mass ratio of 100:(40~60):(10~20) evenly; (2) Apply the spray coating by first adjusting the spray gun to the spray state and spraying 1~2 crosses evenly until the surface is uniform; then adjust the spray gun to spray the paint in dots, and then evenly drip 1~2 crosses onto the surface of the workpiece to form a pattern. Let it dry at room temperature for 20~30 hours to obtain a mother-of-pearl pattern paint film with high resistance to yellowing and high transparency.

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