CN113122125A - UV skin-feel wood coating and preparation method and application thereof - Google Patents
UV skin-feel wood coating and preparation method and application thereof Download PDFInfo
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- CN113122125A CN113122125A CN202110471135.6A CN202110471135A CN113122125A CN 113122125 A CN113122125 A CN 113122125A CN 202110471135 A CN202110471135 A CN 202110471135A CN 113122125 A CN113122125 A CN 113122125A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a UV skin-feel wood coating which comprises the following raw materials in parts by weight: 10-40 parts of UV curing resin, 50-80 parts of reactive diluent, 0.1-5 parts of functional additive, 1-10 parts of functional filler and 1-10 parts of photoinitiator; wherein, the UV curing resin is the combination of 2-functionality elastic urethane acrylate, 2-functionality polysiloxane urethane acrylate and 6-functionality urethane acrylate, and the reactive diluent is the combination of polyethylene glycol (200) diacrylate and ethoxy ethyl acrylate. The invention also discloses application of the UV skin-feel wood coating in preparation of wood finish. The UV skin-feel woodware coating is coated on woodware and cured by using an ultraviolet curing machine, so that the coating of the skin-feel paint can be realized, the skin-feel effect is generated, and the paint film has the advantages of good adhesive force, softness, smoothness, fineness, comfort, skin feel, low cost and no pollution.
Description
Technical Field
The invention belongs to the field of UV (ultraviolet curing) coating, relates to a UV (ultraviolet curing) skin-feel wood coating, and a preparation method and application thereof, and particularly relates to a UV skin-feel wood coating based on a composition of 2-functionality elastic polyurethane acrylate, 2-functionality polysiloxane polyurethane acrylate and 6-functionality polyurethane acrylate, and a preparation method and application thereof.
Background
Skin-feel furniture originated in italy and is named after paint films like baby skin feel and is called "blue blood noble in luxury goods". In recent years, skin feel effects have rapidly prevailed in China, and the skin feel effects have become a new trend of furniture coating. Especially in the high-end customization field, the skin-feel effect is rather regarded as a gold partner for light luxury customization of furniture, and the skin-feel paint naturally becomes a fresh air opening of furniture paint. At present, good skin feel paint products can be said to be pastry, but the supply is limited.
The skin-feel paint has the following characteristics: the skin-care product is smooth, has slight elasticity, and feels as smooth, elastic and comfortable as the skin of a newborn; the gloss of the surface of the paint film is mainly matte, and the matte effect below 15 degrees can be realized; the surface is fine and smooth and has texture; the paint can be self-repaired, and the surface of the paint film is slightly scratched, thereby having the self-repairing function.
Skin-feel panels have become a hot spot for applications in the furniture and upholstery industry due to their good tactile and visual effects. Currently, skin feel effects are generally obtained by three processing techniques:
membrane pressure technology
And (3) rolling UV finish on a workpiece with the primer, pressing and flattening the skin-feel finish by using a skin-feel film, and removing the film after the UV light source is cured to obtain a skin-feel product with film pressure. The film pressing technique is only suitable for processing plane products. And due to the microstructure limitation of the skin-feel film, the aging property of the skin feel can be limited under certain conditions. At present, skin feel films are disposable, so that the operation cost is high.
Second, coating technology
At present, the self-drying paint (PU, water-based) can realize the skin feeling effect through the paint formula.
Curing technology of three-quasi-molecule lamp
1. Principle of operation
IOT corporation from Germany created a 172 nm UV curing apparatus (EXCIMER) and has unique properties that can be referred to as the "black technology" of UV curing technology.
Acrylate double bonds in the UV coating formulation can generate free radicals without the need for photoinitiators after absorbing 172 nm UV light. Meanwhile, the penetration depth of 172 nm UV is only 100 to 500 nm, so that only one layer with an extremely thin surface is cured. Polymerization and crosslinking of this thin layer shrinks to form a matte surface and floats on the uncured underlying liquid, providing a matte finish. However, the curing is carried out in a nitrogen environment, so that the oxygen concentration of the operation environment is lower than 100 ppm; and then the whole curing is carried out by adopting the conventional UV or electron beam.
This method of matting is called "physical matting" because it does not require the use of a matting agent. While polymerization and crosslinking of the 172 nm lower surface can provide high surface hardness and high coating density.
2. Process and apparatus
Excimer lamp curing technology is currently only available for flat products. And (3) rolling UV skin-feel finishing paint on a workpiece with the UV primer, and obtaining a skin-feel product through ultra-matte UV equipment and conventional UV curing equipment.
Compared with PU, water-based skin-feel paint and the like, the skin-feel product obtained by the excimer lamp curing technology has the advantages of higher scratch resistance, pollution resistance, fingerprint resistance, repairability and the like.
However, the equipment of the excimer lamp curing technology has high investment cost once and high operation cost, and only plane products can be processed (if the flatness of a large plate is not enough, defective products can occur). And the standard working time of the excimer lamp is 3000 hours, and the excimer lamp is easy to be damaged due to improper maintenance, and the price of one imported light source is 5-7 ten thousand RMB (different brands have difference). When the equipment is operated, a large amount of high-purity nitrogen is needed, the equipment generally works normally, and the purity of the nitrogen is required to be 20 cubic meters per hour, wherein the purity of the nitrogen is 99.999 percent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a UV skin-feel wood coating.
The purpose of the invention is realized by the following technical scheme:
a UV skin-feel woodenware coating comprises UV curing resin, an active diluent, a functional additive, a functional filler and a photoinitiator; the weight parts of the raw materials are as follows: 10-40 parts of UV curing resin, 50-80 parts of reactive diluent, 0.1-5 parts of functional additive, 1-10 parts of functional filler and 1-10 parts of photoinitiator; the UV-curable resin is a combination of 2-functionality elastic polyurethane acrylate, 2-functionality polysiloxane polyurethane acrylate and 6-functionality polyurethane acrylate, and the reactive diluent is a combination of polyethylene glycol (200) diacrylate (PEG (200) DA) and ethoxyethoxyethyl acrylate (EOEOEA).
Preferably, the UV skin-feel wood coating comprises the following raw materials in parts by weight: 20-30 parts of UV curing resin, 60-70 parts of reactive diluent, 1 part of functional additive, 3-6 parts of functional filler and 2.5-5.5 parts of photoinitiator.
The mass ratio of the 2-functionality elastic polyurethane acrylate to the 6-functionality polyurethane acrylate is (2-5) to 1, and preferably 3: 1; the mass ratio of the 2-functionality polysiloxane type polyurethane acrylate to the 6-functionality polyurethane acrylate is (0.5-2): 1, and preferably 1: 1.
The 6-functionality polyurethane acrylate is the 6-functionality polyurethane acrylate disclosed in CN 103224603A. The 6-functionality polyurethane acrylate is prepared by the following method: the preparation method comprises the steps of firstly reacting 2, 2-dimethylolpropionic acid with ethylene oxide or propylene oxide under the action of a catalyst to prepare trihydroxy polyether ester, and then reacting the trihydroxy polyether ester with diisocyanate and trimethylolpropane di (methyl) acrylate to prepare 6-functionality polyurethane acrylate.
Specifically, the preparation of the 6-functionality polyurethane acrylate comprises the following steps:
preparation of trihydroxy polyether ester: placing 2, 2-dimethylolpropionic acid in a high-pressure reaction kettle, dropwise adding ethylene oxide or propylene oxide according to the molar ratio of the 2, 2-dimethylolpropionic acid to the ethylene oxide or the propylene oxide of 1: 4-8, reacting at 155-165 ℃ under the action of a catalyst, controlling the reaction pressure to be 0.2-0.6 MPa, after dropwise adding the ethylene oxide or the propylene oxide, preserving heat at 155-165 ℃ for 1-3 hours, cooling to below 80 ℃, adding activated clay, stirring for 30 minutes, and performing circulating filter pressing until the mixture is clear and transparent to obtain trihydroxy polyether ester. Wherein the catalyst is one or a mixture of two or more of sodium formate, potassium formate, sodium benzoate and potassium benzoate in any proportion, and the dosage of the catalyst is 1 to 5 weight percent of the total mass of the 2, 2-dimethylolpropionic acid and the ethylene oxide or the propylene oxide.
Preparation of 6-functionality urethane acrylate: trihydroxy polyether ester, diisocyanate and trimethylolpropane di (methyl) acrylate are reacted at the temperature of 60-95 ℃ according to the molar ratio of 1: 3-3.5: 3-5 to prepare 6-functionality polyurethane acrylate.
Preferably, the preparation of the 6-functional urethane acrylate comprises: 1mol of trihydroxy polyether ester and 3-3.5 mol of diisocyanate are heated to 60-65 ℃ under the catalysis of dibutyltin dilaurate catalyst, stirred and react for 2-3 hours in a heat preservation way to obtain an intermediate compound, the intermediate compound and 3-5 mol of trimethylolpropane di (methyl) acrylate are slowly heated to 80-85 ℃ for 0.5-1 hour under the action of a polymerization inhibitor and dibutyltin dilaurate catalyst, and react for 4-5 hours in a heat preservation way to obtain 6-functionality polyurethane acrylate. Wherein the polymerization inhibitor can be p-hydroxyanisole or hydroquinone, and the dosage of the polymerization inhibitor is 100-5000 ppm; the dosage of the catalyst dibutyltin dilaurate is 100-3000 ppm each time.
The diisocyanate is selected from one of TDI, HDI, IPDI, HMDI and MDI.
The 2-functionality elastic polyurethane acrylate is 2-functionality polyurethane acrylate disclosed in CN 105801829A.
The 2-functionality elastic polyurethane Acrylate is prepared from Polycaprolactone diol (Polycaprolactone glycol) and isocyanate ethyl Acrylate (2-Isocyanatoethyl Acrylate, AOI for short, CAS number: 13641-96-8, molecular formula: C6H7NO3Molecular weight: 141.12) to obtain 2-functionality polycaprolactone urethane acrylate.
Preferably, the 2-functionality elastic polyurethane acrylate is prepared by stirring polycaprolactone diol and isocyanate ethyl acrylate according to the use ratio of 1mol: 1.9-2 mol at the temperature of 80-95 ℃ under the action of a catalyst and a polymerization inhibitor, and carrying out heat preservation reaction for 3-6 hours; wherein the catalyst is dibutyltin dilaurate, and the dosage of the catalyst is 100-3000 ppm of the total mass of polycaprolactone diol and isocyanate ethyl acrylate; the polymerization inhibitor can be p-hydroxyanisole or hydroquinone, and the dosage of the polymerization inhibitor is 100-5000 ppm of the total mass of polycaprolactone diol and isocyanate ethyl acrylate.
The molecular weight of the polycaprolactone diol is 500-6000, preferably 2000-4000.
Specifically, the polycaprolactone diol is selected from boston polycaprolactone diol (table 1):
TABLE 1 Cytostan polycaprolactone diol
The 2-functionality polysiloxane type polyurethane acrylate is prepared by the following method: the 2-functionality polysiloxane type polyurethane acrylate is prepared by the reaction of polyether modified polysiloxane and isocyanate ethyl acrylate.
Preferably, the 2-functionality polysiloxane type polyurethane acrylate is prepared by the following method: under the action of a catalyst and a polymerization inhibitor, stirring polyether modified polysiloxane and isocyanate ethyl acrylate according to the dosage ratio of 1mol: 1.9-2 mol for reaction for 3-6 hours at 80-95 ℃; wherein the catalyst is dibutyltin dilaurate, and the dosage of the catalyst is 100-3000 ppm of the total mass of the polyether modified polysiloxane and the isocyanate ethyl acrylate; the polymerization inhibitor can be p-hydroxyanisole or hydroquinone, and the dosage of the polymerization inhibitor is 100-5000 ppm of the total mass of the polyether modified polysiloxane and the isocyanate ethyl acrylate.
The structural formula of the polyether modified polysiloxane is as follows:
the molecular weight of the polyether modified polysiloxane is 1000-8000, preferably 2000-3000.
The polyether modified polysiloxane is a polydimethylsiloxane and polyoxyethylene copolymer with primary hydroxyl functional groups, has 100% activity, can be used as a modifier of polyurethane resin, can improve the wear resistance of a paint film prepared from the UV skin-feel wood coating, increases the surface smoothness and luster, improves the heat resistance, hydrophobicity and flexibility of the paint film, and can also improve the low-temperature embrittlement phenomenon of the paint film.
The polyether-modified polysiloxane can be prepared or purchased as a commercially available product with reference to the following documents:
1. synthesis and performance studies of novel silicone surfactants [ D ]. korean rich wuhan university 2004.
2. Synthesis of polyether modified polysiloxane and its Performance study [ D ]. Yaohuotao, university of southeast 2016.
Specifically, the polyether modified polysiloxane is selected from polyether modified polysiloxane products (table 2) of the chemical group ltd of new safety, zhejiang, and has the following physical properties:
TABLE 2 polyether modified polysiloxanes
The mass ratio of the polyethylene glycol (200) diacrylate to the ethoxy ethyl acrylate is 2: 1.
The ethoxy ethyl acrylate (EOEOEA) is the ethoxy ethyl acrylate disclosed in Chinese patent CN102633634A, and has the appearance: clear and transparent mucus, the ester content is more than or equal to 98 percent, the acid value is less than or equal to 1mgKOH, the chroma is less than or equal to 50APHA, and the water content is less than or equal to 0.2 percent.
PEG (200) DA and EOEOEA are active diluents, play a role in diluting resin in UV skin-feel wood coatings and participate in curing reaction, and both PEG (200) DA and EOEOEA have good reactivity and provide excellent flexibility after film forming.
The photoinitiator is a combination of a photoinitiator 184 (1-hydroxycyclohexyl phenyl ketone) and a photoinitiator TPO (2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide) according to a mass ratio of (7-8) to 1. The photoinitiator absorbs ultraviolet light to initiate curing, and is a core material for UV curing, the photoinitiator 184 mainly initiates middle-surface layer curing, the photoinitiator TPO mainly initiates deep layer curing, and the combination of the two materials achieves a good synergistic curing effect.
The functional auxiliary agent is a combination of a defoaming agent, a wetting dispersant and a flatting agent according to a mass ratio of 1:1: 2.
Preferably, the defoaming agent is a defoaming agent BYK055, the wetting and dispersing agent is a wetting and dispersing agent BYK2009, and the leveling agent is a leveling agent BYK-UV 3505.
The functional filler is a combination of elastic powder, matting powder and hand feeling wax emulsion according to a mass ratio of 1:1: 1. The elastic powder improves the elasticity of the paint film and increases the hand feeling, the matting powder is wax-modified matting powder (wax-treated matting powder) and plays a role in matting, and hand feeling wax slurry increases the hand feeling of the surface of the paint film, has the effects of wear resistance and scratch resistance, and also has a matting effect.
Preferably, the elastic powder is DADAHIJING elastic powder RHU-5070D, the matting powder is DONGZAO matting powder E1011, and the handfeel wax slurry is BYK CERAFAK 103 wax dispersoid.
The invention also provides a preparation method of the UV skin-feel wood coating, which comprises the following steps: adding UV curing resin, reactive diluent, functional assistant and initiator into a high-speed dispersion kettle according to a formula, stirring at the rotating speed of 500-1500 rpm for 30-2 hours, adding functional filler after stirring uniformly, continuing stirring for 30-2 hours, and defoaming in vacuum after dispersing uniformly to obtain the UV skin-feel wood coating.
The vacuum defoaming is carried out for 30 minutes under the vacuum degree of more than-0.096 MPa.
The invention also aims to provide application of the UV skin-feel wood coating in preparation of woodware finish paint.
It is another object of the present invention to provide a method of preparing a woodware finish comprising: coating the UV skin-feel wood coating on a wood through a roller coater, wherein the thickness of the film is 20 microns, and curing the UV skin-feel wood coating through an ultraviolet curing machine, wherein the energy during curing is 80W/cm, so that a skin-feel paint film is obtained.
The invention has the beneficial effects that:
the invention provides high-speed curing performance by 6-functionality polyurethane acrylate and good wear resistance after film forming; good flexibility and adhesive force after film forming are provided by the 2-functionality polyurethane acrylate; the 2-functionality polysiloxane type polyurethane acrylate provides good smooth feeling and oily feeling after film forming, improves the handfeel, has an obvious synergistic effect with elastic powder, has extremely excellent lubricating surface and smooth feeling, and endows a paint film with elasticity, a self-repairing function and soft and dense touch (skin feeling). The active diluent is selected from a bifunctional monomer and a monofunctional monomer, the activity is high, the flexibility is good, and the photoinitiator compounded in a specific proportion is matched, so that the energy is saved, the ultraviolet curing can be realized by adopting an ultraviolet cold light source, the curing speed of the UV skin-feel wood coating is obviously improved, and the curing speed can reach 12-18 m/min. The UV skin-feel wood coating is suitable for high-speed automatic production, meets the use requirement of the conventional UV wood finish, and has excellent cured product performance: the paint film has good adhesive force, softness, smoothness, fineness, comfort, skin feel, low cost and no pollution (no volatile organic compound VOC).
The UV skin-feel wood coating is suitable for plane wood products and non-plane wood products, the UV skin-feel wood coating is coated on wood products, and an ultraviolet curing machine is used for curing, so that the coating of the skin-feel paint can be realized, and the skin-feel effect is generated. Compared with a film pressing process route, the production efficiency is high, rapid and continuous production is realized, a pressing die is not needed, and the production cost is reduced; compared with an excimer curing route, the method has the advantages of small investment, simple equipment and no need of inert gas protection, and one set of finish paint equipment is used for one-time curing molding. The coating and curing process is simple, efficient, energy-saving and environment-friendly.
Detailed Description
The technical solution of the present invention is further described with reference to the following embodiments.
Product description of DANIHIJING elastic powder RHU-5070D: appearance: a transparent white powder; average particle size: 7 microns; oil absorption: 48; melting point: more than 250 ℃; specific gravity: 1.20; bulk density: 0.40 g/cc; non-volatile component: is more than 99 percent.
Example 1
750 g of polycaprolactone diol (Cystol CAPA2302, molecular weight of 3000), 70.5 g (0.5mol) of isocyanate ethyl acrylate, 0.12 g of dibutyltin dilaurate serving as a catalyst and 0.8 g of p-hydroxyanisole serving as a polymerization inhibitor are put into a 1000mL four-neck flask, the temperature is slowly raised to 80-85 ℃ for 0.5-4 hours, the temperature is kept, stirring is carried out, reaction is carried out for 3-5 hours, and discharging is carried out, so that the 2-functionality polycaprolactone polyurethane acrylate with the structure shown in the following formula is prepared.
R is: 1, 4-butylene (-CH)2CH2CH2CH2-, i.e. the diol initiator in the polycaprolactone diol is 1, 4-butanediol;
a+b＝(3000-90)/114＝25.5263。
example 2
1340 g of 2, 2-dimethylolpropionic acid (C) was charged in a 6L autoclave5H10O4Molecular weight 134), 40g of sodium formate, heating to 155 deg.C, and beginning to drop ethylene oxide (C)
Molecular weight 44)2200 g for reaction, controlling the temperature to be 155-165 ℃ and the pressure to be 0.10-0.40 MPa, dropwise adding for 3-4 hours, preserving the heat for 2-3 hours at 155-165 ℃ after finishing the dropwise adding, then cooling to be below 80 ℃, and discharging to obtain a crude product; adding 40g of active white clay into the crude product, stirring for 30 minutes, and filtering to obtain clear and transparent trihydroxy polyether ester (C)15H30O9Molecular weight 354)3469.2 g, and the reaction formula and the structure are shown as the following formula, wherein: n is 2, a + b + c is 5.
Into a 3000mL four-necked flask was charged trihydroxy polyether ester (C)15H30O9Molecular weight 354)177 g, IPDI 333 g (1.5mol) and dibutyltin dilaurate as catalyst 0Heating to 60-65 ℃, stirring, carrying out heat preservation reaction for 2-3 hours, adding 1 g of p-hydroxyanisole serving as a polymerization inhibitor, 0.2 g of dibutyltin dilaurate serving as a catalyst and 605 g of trimethylolpropane diacrylate, slowly heating to 80-85 ℃ for 0.5-1 hour, carrying out heat preservation reaction for 4-5 hours, and discharging to obtain 6-functionality-degree polyurethane acrylate, wherein the structure is shown as the following formula:
wherein:
R1comprises the following steps:
n＝2，a+b+c＝5，
R2comprises the following steps:
example 3
1000 g of polyether modified polysiloxane (UV resin modified special organic silicon product, model: 7520, molecular weight 2000), 141 g (1mol) of isocyanate ethyl acrylate, 0.12 g of catalyst dibutyltin dilaurate and 0.9 g of polymerization inhibitor p-hydroxyanisole are put into a 2000mL four-neck flask, the product is prepared by the New Ann chemical group of Zhejiang, the temperature is slowly raised to 80-85 ℃ for 0.5-4 hours, the mixture is kept warm and stirred for reaction for 3-5 hours, and the 2-functionality polysiloxane type polyurethane acrylate is prepared after discharging.
Example 4
585 kilograms of cyclohexane, 923.92 kilograms of diethylene glycol ethyl ether, 546.08 kilograms of acrylic acid, 6 kilograms of p-hydroxyanisole, 3 kilograms of sodium hypophosphite and 30 kilograms of methane sulfonic acid are put into a 3000L reaction kettle; stirring, continuously introducing compressed air into the kettle through a kettle bottom distributor, heating to 80-85 ℃, starting reflux dehydration, carrying out esterification reaction for 10-12 hours at the temperature of 85-92 ℃, detecting the acid value of 10-25 mgKOH/g when the reflux dehydration is carried out till no water is discharged, finishing the reaction, and cooling to 40 ℃; adding 32 kg of caustic soda flakes and 75 kg of water, and stirring for 30 minutes; adding 6.5 kilograms of magnesium silicate hydrate, stirring and adsorbing for 30 minutes; then distilling the water and the solvent under reduced pressure at 50-95 ℃ under the vacuum degree of more than-0.098 MPa; after the recovered water and the solvent are layered, the water can be directly used in the next neutralization without any treatment, and the solvent can be directly used in the next esterification reaction; after distillation, filter pressing; then 60 kg of alkaline calcium bentonite and 25 kg of calcium oxide are added, stirred for 30 minutes and then subjected to circulating filter pressing until the product is clear and transparent to obtain the ethoxy ethyl acrylate product.
Product index detection results: the appearance is clear and transparent, the ester content is 98.4 percent, the acid value is 0.16mgKOH, the chroma is 30APHA, the water content is 0.08 percent, and the viscosity is 8cps @25 ℃. 1271 kg of discharged material and 1296.25 kg of theoretical discharged material, and the yield is 98.05 percent.
Example 5-example 8
Table 3 formula of UV skin-feel wood coating
Examples 5 to 8 were prepared using the 2-functional elastic urethane acrylate prepared in example 1, the 6-functional urethane acrylate prepared in example 2, and the 2-functional polysiloxane urethane acrylate prepared in example 3 in a ratio of 3:1: 1. The uv curable resin in comparative example 1 was 26 parts by weight of 6-functional urethane acrylate, the uv curable resin in comparative example 2 was 26 parts by weight of 2-functional elastic urethane acrylate, and the uv curable resin in comparative example 3 was 26 parts by weight of 2-functional polysiloxane urethane acrylate.
Examples 5-8, comparative examples 1-3 the reactive diluents were all a combination of polyethylene glycol (200) diacrylate and ethoxyethoxyethyl acrylate (EOEOEA) in a mass ratio of 2: 1.
Example 5 the functional additives in example 8 and comparative examples 1 to 3 are all the combination of a defoaming agent BYK055, a wetting dispersant BYK2009 and a leveling agent BYK-UV3505 according to the mass ratio of 1:1:1, and are all products of Bike Germany company.
Examples 5 to 8 and comparative examples 1 to 3 all the functional fillers were a combination of DARI refined RHU-5070D elastic powder, Japan DONGDONGDONGO extinction powder E1011 and hand feeling wax slurry (BYK CERAFAK 103 wax dispersion) in a mass ratio of 1:1: 1.
Examples 5-8, comparative examples 1-3 the photoinitiator was a combination of photoinitiator 184 (1-hydroxycyclohexyl phenyl ketone) and photoinitiator TPO (2,4, 6-trimethylbenzoyl-diphenylphosphine oxide) in a mass ratio of 15: 2.
Adding the reactive diluent, the UV curing resin and the functional assistant photoinitiator into a high-speed dispersion kettle according to a formula shown in Table 1, stirring for 2 hours at a rotating speed of 800 revolutions per minute, adding the functional filler after stirring uniformly, stirring for 1 hour at a rotating speed of 1000 revolutions per minute, dispersing uniformly, and finally defoaming for 30 minutes at a vacuum degree of more than-0.096 MPa to obtain the UV skin-feel wood coating.
Film forming experiment and paint film performance test:
(1) coating and curing
The UV skin-feel wood coating prepared by the method is coated on a treated wood base material through a roller coater, and the thickness of the coating is 20 micrometers. Curing with an Ultraviolet (UV) curing machine at an energy of 80W/cm and recording the curing speed (the speed required for complete curing of the coating, in the range of 12-18 m/min) to obtain a skin-feel paint film.
(2) Performance test method
The test methods are shown in Table 4.
TABLE 4 Performance test method of paint film made of UV skin-feel wood coating
| Item | Index (I) | Test method | Remarks for note |
| Speed of curing | 5-25m/min | HG/T3655-2012 | |
| Skin feel | According to the requirements | Subjective evaluation method | Evaluation of hand feeling |
| Degree of gloss | According to the requirements | GB9754-88 | 60 degree specular reflection |
| Hardness of | According to the requirements | GB/T6739-1996 | Pencil hardness tester |
| Adhesion force | Grade 2 or below | GB/T9286-1998 | Lattice-cutting method |
And (3) evaluating hand feeling: master and slaveObserving and evaluating method, concentrating 10 skilled personnel for blind test, adopting a touch method to the cured paint film under certain environment, selecting a rank method for evaluation and averaging, and dividing results in a group of evaluation data into five grades to "★"means that five of them are the best and one is the worst"★More "means better hand feel and more comfortable touch than other coating films.
(3) The results of the performance tests are shown in Table 5.
TABLE 5 Properties of paint films made from UV skin-feel Wood coatings
The 2-functionality polysiloxane type polyurethane acrylate can endow a paint film with soft and lubricating performance, has obvious synergistic effect with elastic powder, enables a woodware to have extremely excellent lubricating surface and smooth feeling, and endows the paint film with elasticity, self-repairing function and soft, soft and dense touch (skin feeling). According to table 5, after the UV skin-feel wood coatings of examples 5 to 8 are formed into films, the set performance requirements are all met, the softness, elasticity and hand feeling evaluation of the paint films are all good, and the UV skin-feel wood coating is suitable for preparing UV skin-feel wood finish. In the comparative example 1, as the 2-functionality polycaprolactone type polyurethane acrylate and the 2-functionality polysiloxane type polyurethane acrylate are not added, the crosslinking density and the rigidity of the coating film are too high, so that the flexibility and the adhesive force of the coating film can not meet the requirements; comparative examples 2 and 3 have low curing speed, low crosslinking density of the coating, poor film forming property and insufficient strength of the coating because 6-functionality urethane acrylate is not added; comparative examples 1 and 2 had poor hand evaluation due to no addition of silicone urethane acrylate.
Claims (10)
1. The UV skin-feel wood coating is characterized in that: comprises UV curing resin, a reactive diluent, a functional additive, a functional filler and a photoinitiator; the weight parts of the raw materials are as follows: 10-40 parts of UV curing resin, 50-80 parts of reactive diluent, 0.1-5 parts of functional additive, 1-10 parts of functional filler and 1-10 parts of photoinitiator; the UV-curable resin is a combination of 2-functionality elastic polyurethane acrylate, 2-functionality polysiloxane polyurethane acrylate and 6-functionality polyurethane acrylate, and the reactive diluent is a combination of polyethylene glycol (200) diacrylate and ethoxyethoxyethyl acrylate.
2. The UV skin-feel wood coating of claim 1, wherein: the UV skin-feel wood coating comprises the following raw materials in parts by weight: 20-30 parts of UV curing resin, 60-70 parts of reactive diluent, 1 part of functional additive, 3-6 parts of functional filler and 2.5-5.5 parts of photoinitiator.
3. The UV skin-feel wood coating of claim 1 or 2, wherein: the mass ratio of the 2-functionality elastic polyurethane acrylate to the 6-functionality polyurethane acrylate is (2-5) to 1, and preferably 3: 1; the mass ratio of the 2-functionality polysiloxane type polyurethane acrylate to the 6-functionality polyurethane acrylate is (0.5-2): 1, and preferably 1: 1.
4. The UV skin-feel wood coating of claim 1 or 2, wherein: the 6-functionality polyurethane acrylate is the 6-functionality polyurethane acrylate disclosed in CN 103224603A; the 2-functionality elastic polyurethane acrylate is 2-functionality polyurethane acrylate disclosed in CN 105801829A; the 2-functionality polysiloxane type polyurethane acrylate is prepared by the following method: the 2-functionality polysiloxane type polyurethane acrylate is prepared by the reaction of polyether modified polysiloxane and isocyanate ethyl acrylate.
5. The UV skin-feel wood coating of claim 4, wherein: the 6-functionality polyurethane acrylate is prepared by the following method: firstly, 2-dimethylolpropionic acid reacts with ethylene oxide or propylene oxide under the action of a catalyst to prepare trihydroxy polyether ester, and then the trihydroxy polyether ester reacts with diisocyanate and trimethylolpropane di (methyl) acrylate to prepare 6-functionality polyurethane acrylate;
the 2-functionality elastic polyurethane acrylate is prepared by the following method: polycaprolactone urethane acrylate with functionality of 2 is prepared by reacting polycaprolactone diol with isocyanate ethyl acrylate; wherein the molecular weight of the polycaprolactone diol is 500-6000, preferably 2000-4000;
the 2-functionality polysiloxane type polyurethane acrylate is prepared by the following method: polyether modified polysiloxane reacts with isocyanate ethyl acrylate to prepare 2-functionality polysiloxane type polyurethane acrylate; wherein, the structural formula of the polyether modified polysiloxane is as follows:
the molecular weight of the polyether modified polysiloxane is 1000-8000.
6. The UV skin-feel wood coating of claim 1 or 2, wherein: the mass ratio of the polyethylene glycol (200) diacrylate to the ethoxy ethyl acrylate is 2: 1.
7. The UV skin-feel wood coating of claim 1 or 2, wherein: the photoinitiator is a combination of photoinitiator 184 and photoinitiator TPO according to a mass ratio of (7-8): 1; the functional auxiliary agent is a combination of a defoaming agent, a wetting dispersant and a flatting agent according to a mass ratio of 1:1: 2; the functional filler is a combination of elastic powder, matting powder and hand feeling wax emulsion according to a mass ratio of 1:1: 1.
8. The UV skin-feel wood coating of claim 7, wherein: the defoaming agent is a defoaming agent BYK055, the wetting dispersant is a wetting dispersant BYK2009, and the leveling agent is a leveling agent BYK-UV 3505;
the elastic powder is big day refined elastic powder RHU-5070D, the matting powder is cobia matting powder E1011, and the hand feeling wax slurry is a BYK CERAFAK 103 wax dispersoid.
9. A method for preparing the UV skin-feel wood coating of claim 1, characterized in that: the method comprises the following steps: adding UV curing resin, reactive diluent, functional assistant and initiator into a high-speed dispersion kettle according to a formula, stirring at the rotating speed of 500-1500 rpm for 30-2 hours, adding functional filler after stirring uniformly, continuing stirring for 30-2 hours, and defoaming in vacuum after dispersing uniformly to obtain the UV skin-feel wood coating.
10. Use of the UV skin-feel wood coating of claim 1 in the preparation of a wood finish.
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| CN113402968A (en) * | 2021-07-19 | 2021-09-17 | 江门市久冠松高分子材料有限公司 | Development method of novel UV ultraviolet curing skin-feel coating |
| CN114149705A (en) * | 2021-09-07 | 2022-03-08 | 湖州玖丰新材料科技有限公司 | Manufacturing process of environment-friendly skin-feel paint |
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| CN114149705A (en) * | 2021-09-07 | 2022-03-08 | 湖州玖丰新材料科技有限公司 | Manufacturing process of environment-friendly skin-feel paint |
| CN114763451A (en) * | 2021-10-20 | 2022-07-19 | 上海君子兰新材料股份有限公司 | Fast-curing UV (ultraviolet) water-based solid-color finish paint and preparation method thereof |
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| CN114539906A (en) * | 2021-12-31 | 2022-05-27 | 澳达树熊涂料(惠州)有限公司 | Anti-yellowing skin-feel matte top-coat paint and preparation method thereof |
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| CN114921129A (en) * | 2022-05-23 | 2022-08-19 | 武汉工程大学 | Self-repairing high-refractive-index ink and preparation method and application thereof |
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| CN116082950A (en) * | 2022-12-15 | 2023-05-09 | 惠州飞凯新材料有限公司 | Elastic skin photosensitive curing coating and preparation method and application thereof |
| KR102571491B1 (en) * | 2023-01-09 | 2023-08-25 | 조섭 | UV curing paint composition for wood and coating method using the composition |
| CN116063920A (en) * | 2023-02-02 | 2023-05-05 | 广东立邦长润发科技材料有限公司 | Excimer nitrogen protection curing UV coating and curing process thereof |
| CN116063920B (en) * | 2023-02-02 | 2025-02-14 | 广东立邦长润发科技材料有限公司 | A kind of excimer nitrogen protection curing UV coating and its curing process |
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