CN115990928A - Process for coating veneer with digital spraying veneer totally-enclosed effect - Google Patents
Process for coating veneer with digital spraying veneer totally-enclosed effect Download PDFInfo
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- CN115990928A CN115990928A CN202310184806.XA CN202310184806A CN115990928A CN 115990928 A CN115990928 A CN 115990928A CN 202310184806 A CN202310184806 A CN 202310184806A CN 115990928 A CN115990928 A CN 115990928A
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- 238000007592 spray painting technique Methods 0.000 claims abstract description 13
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- 238000002360 preparation method Methods 0.000 claims description 11
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- 239000007787 solid Substances 0.000 claims description 9
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- AOHJOMMDDJHIJH-UHFFFAOYSA-N propylenediamine Chemical compound CC(N)CN AOHJOMMDDJHIJH-UHFFFAOYSA-N 0.000 claims description 8
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 8
- QDRKDTQENPPHOJ-UHFFFAOYSA-N sodium ethoxide Chemical compound [Na+].CC[O-] QDRKDTQENPPHOJ-UHFFFAOYSA-N 0.000 claims description 8
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- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
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- ISKQADXMHQSTHK-UHFFFAOYSA-N [4-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=C(CN)C=C1 ISKQADXMHQSTHK-UHFFFAOYSA-N 0.000 claims description 5
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 5
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 5
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 5
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 4
- RUPBZQFQVRMKDG-UHFFFAOYSA-M Didecyldimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCC[N+](C)(C)CCCCCCCCCC RUPBZQFQVRMKDG-UHFFFAOYSA-M 0.000 claims description 4
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 claims description 4
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 229960004670 didecyldimethylammonium chloride Drugs 0.000 claims description 4
- MQWFLKHKWJMCEN-UHFFFAOYSA-N n'-[3-[dimethoxy(methyl)silyl]propyl]ethane-1,2-diamine Chemical compound CO[Si](C)(OC)CCCNCCN MQWFLKHKWJMCEN-UHFFFAOYSA-N 0.000 claims description 4
- WFUGQJXVXHBTEM-UHFFFAOYSA-N 2-hydroperoxy-2-(2-hydroperoxybutan-2-ylperoxy)butane Chemical compound CCC(C)(OO)OOC(C)(CC)OO WFUGQJXVXHBTEM-UHFFFAOYSA-N 0.000 claims description 3
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 claims description 3
- 239000001038 titanium pigment Substances 0.000 claims description 3
- SZEMGTQCPRNXEG-UHFFFAOYSA-M trimethyl(octadecyl)azanium;bromide Chemical compound [Br-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C SZEMGTQCPRNXEG-UHFFFAOYSA-M 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
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- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a technology for coating veneer with a digital spray-coating veneer totally-enclosed effect, which comprises the following steps: s1: softening treatment; s2: surface treatment: uniformly coating self-repairing shape memory polymer emulsion on two side surfaces of the veneer after S1 softening treatment, wherein the single-sided coating amount is 15-20g/m 2 Then hot pressing and curing for 0.5-1h under the conditions that the pressure is 6-10MPa and the temperature is 85-120 ℃; the self-repairing shape memory polymer emulsion consists of polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate, 2-ureido-4 [1H ]]Pyrimidone, organotin catalyst, etc.; s3: sticking self-adhesive non-woven fabrics; s4: coating a UV transparent elastic primer and a UV white high-coverage primer by roller, and then carrying out digital spray painting; s5: and (3) rolling a UV transparent elastic finishing coat. The invention uses self-repairing shape memory polymer emulsion to coat and heat-press the veneer on the surface, so that part of the veneer is penetrated into the veneer to form a polymer protection layer connected with the inside and the outside, and wood Pi Rou is addedToughness, preventing cracking and breaking of wood veneer and improving mechanical properties of wood veneer.
Description
Technical Field
The invention belongs to the field of veneer surface treatment, and particularly relates to a technology for coating veneer with a digital spraying veneer totally-enclosed effect.
Background
The veneer is a common decorative material, is mainly used in the production fields of furniture, decorative veneer, wooden doors, floor fabrics and the like, and is a wood lamellar material produced by a rotary cutting or sawing method, the thickness of the wood lamellar material is generally between 0.4 and 1.0mm, and the wood lamellar material can be divided into combined veneer, natural veneer, dyed veneer and the like. The wood veneer is coated by the composite wood Pi Youchen, the existing coating process generally adopts PVC, melamine paper and wood Pi Yuan veneer as raw materials, but the PVC and the melamine have the problems of poor visual effect and poor texture of non-solid wood, and the wood Pi Yuan veneer has single color and mostly is sprayed with paint by manual operation, so that industrialization and full sealing effect cannot be realized; and as the wood veneer is fragile and easy to break, the existing wood veneer is generally not subjected to surface treatment and directly enters a coating process, so that the problem of cracking and breaking of the wood veneer is easy to occur in the coating process, the yield is reduced, and the subsequent operation flow is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a process for coating veneer with a digital spraying veneer totally-enclosed effect.
The technical scheme of the invention is summarized as follows:
a digital spray finishing totally-enclosed effect wood veneer coating process comprises the following steps:
s1: softening: soaking veneer with thickness of 15-30mm in softening solution at 55-65deg.C for 0.5-1 hr, washing, and drying;
the softening liquid consists of the following raw materials in parts by mass: 8-15 parts of sodium ethoxide, 10-15 parts of 1, 2-propylene diamine, 6-12 parts of an aminosilane coupling agent, 2-3 parts of a quaternary ammonium salt surfactant and 100 parts of water;
s2: surface treatment: uniformly coating self-repairing shape memory polymer emulsion on two side surfaces of the veneer after S1 softening treatment, wherein the single-sided coating amount is 15-20g/m 2 Then hot pressing and curing for 0.5-1h under the conditions that the pressure is 6-10MPa and the temperature is 85-120 ℃;
the self-repairing shape memory polymer emulsion is prepared from the following raw materials in parts by mass: 30-40 parts of polytetramethylene ether glycol, 20-30 parts of 4,4' -diphenylmethane diisocyanate, 12-18 parts of 2-ureido-4 [1H ] -pyrimidinone, 1-2 parts of an organotin catalyst, 15-20 parts of aqueous epoxy resin, 10-15 parts of silicone-acrylate emulsion, 20-30 parts of tetrahydrofuran and 15-25 parts of deionized water;
s3: sticking self-adhesive non-woven fabrics on one surface of the wood veneer after the S2 surface treatment, and taking the self-adhesive non-woven fabrics as the back surface of the wood veneer;
s4: the front side of the veneer after the S3 treatment is coated with the UV transparent elastic primer and the UV white high coverage primer in a roll coating way, and the roll coating amount of the UV transparent elastic primer is 15-20g/m 2 The roll coating amount of the UV white high coverage primer is 30-50g/m 2 The wood veneer is completely sealed and coated, then the solid wood simulated texture pattern is printed by digital spray painting equipment, and after ultraviolet light curing, the digital spray painting facing with the full sealing effect is formed;
s5: and (3) rolling UV transparent elastic finish paint on the front surface of the wood veneer after the treatment of S4, wherein the roll coating amount is 20-30g/m < 2 >, and the wood veneer is cured by ultraviolet light.
Further, the amount of the softening liquid is preferably less than the bark.
Further, the aminosilane coupling agent comprises one or more of gamma-aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane and N- (beta-aminoethyl) -gamma-aminopropyl methyl dimethoxysilane.
Further, the quaternary ammonium salt surfactant comprises one or more of didecyl dimethyl ammonium chloride, cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium bromide and dodecyl dimethyl benzyl ammonium chloride.
Further, the chemical structural formula of the 2-ureido-4 [1H ] -pyrimidinone is as follows:
further, the organotin catalyst is one or more of dibutyl tin dilaurate, dibutyl tin diacetate and stannous octoate.
Further, the preparation method of the self-repairing shape memory polymer emulsion comprises the following steps:
(1) Heating polytetramethylene ether glycol to 95-115 ℃, and vacuum dehydrating for 1-2h;
(2) Uniformly mixing dehydrated polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate and an organotin catalyst under the protection of nitrogen, and reacting for 2-3 hours at 85-95 ℃ to obtain a polyurethane prepolymer;
(3) Adding 2-ureido-4 [1H ] -pyrimidinone into tetrahydrofuran, stirring and dissolving, uniformly mixing with polyurethane prepolymer, stirring and reacting for 1.5-3 hours at 60-65 ℃, adding aqueous epoxy resin and silicone-acrylate emulsion, uniformly stirring, adding deionized water, and fully stirring to obtain the self-repairing shape memory polymer emulsion.
Further, the UV transparent elastic primer comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester, 20-25 parts of anhydride modified epoxy acrylic ester, 15-20 parts of styrene-acrylic emulsion, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropionic acid and 1-5 parts of defoamer.
Further, the UV white high-coverage primer comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester, 20-25 parts of anhydride modified epoxy acrylic ester, 20-30 parts of styrene-acrylic emulsion, 25-40 parts of rutile type titanium pigment, 4-6 parts of vinyl triethoxysilane, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropionic acid, 1-3 parts of 2-butanone peroxide and 1-5 parts of defoamer.
Further, the UV transparent elastic finishing paint comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester, 20-25 parts of polyester modified epoxy acrylic ester, 15-20 parts of styrene-acrylic emulsion, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropionic acid and 1-5 parts of defoamer.
The invention has the beneficial effects that:
1. according to the invention, polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate and 2-ureido-4 [1H ] -pyrimidinone are reacted to synthesize the self-repairing polyurethane with multiple dynamic hydrogen bonds and shape memory effects for the first time, the dynamic thermal reversible quadruple hydrogen bonds are introduced into polyurethane molecular chains, the shape memory effect is used as auxiliary restoring force, so that the self-repairing polymer emulsion with the shape memory effect is prepared, the inside of the veneer is filled with the self-repairing shape memory polymer under the penetrating action, an integrated self-repairing shape memory polymer protective layer connected with the inside and the outside is formed, when cracks or cracks appear on the veneer, the self-repairing shape memory polymer at the cracks or cracks is subjected to recombination and reversible exchange under the heating action, the rapid and automatic repairing of the cracks or cracks of the veneer is realized, the repairing efficiency is high, and the repeated recycling of the veneer is realized.
2. According to the invention, the wood veneer is pretreated by using the softening liquid, and sodium ethoxide and 1, 2-propylene diamine in the softening liquid dissolve out cellulose and hemicellulose components of the wood veneer, so that the inclination angle of wood Pi Qian wires is increased, and therefore, the wood veneer can be stretched and deformed within a certain angle, and can be restored and recovered, the shaping toughness of the wood veneer is improved, and on the other hand, the softening liquid damages hydrogen bonds and ester bonds in cellulose, hemicellulose and lignin in the wood veneer, and the plasticity and relaxation performance of the wood veneer are further improved. In addition, the wood veneer is pretreated by using softening liquid, so that lignin and cellulose on the surface of the wood veneer are partially hydrolyzed, on one hand, the surface of the wood veneer is roughened, uneven micro-structure or micropore structure appears on the surface of the wood veneer, the surface load of the aminosilane coupling agent is increased, the wood veneer structure is more loose, the quaternary ammonium salt surfactant has the functions of wetting and promoting permeation, the aminosilane coupling agent is synergistically promoted to permeate into the wood veneer, the modification effect of the aminosilane coupling agent is further improved, on the other hand, due to the existence of a large number of micro-structure or micropore structure in the surface of the wood veneer, the coating and hot-pressing treatment of the self-repairing shape memory polymer emulsion are easy, the permeation of the self-repairing shape memory polymer emulsion into the wood veneer is promoted, the bonding strength is improved, and meanwhile, free-NCO, epoxy groups in the self-repairing shape memory polymer emulsion and the exposed active hydroxyl structure of the wood veneer and the aminosilane coupling agent loaded by the active hydroxyl structure are crosslinked, and the self-repairing shape memory polymer emulsion further improves the bonding strength of the self-repairing shape memory polymer emulsion.
3. According to the invention, the surface of the self-repairing shape memory polymer emulsion is used for coating and hot-pressing the veneer, so that part of the veneer is permeated into the veneer to form the polymer protection layer connected with the inside and the outside, the flexibility of the veneer is increased, the veneer is prevented from cracking and breaking, and the mechanical property of the veneer is improved.
4. According to the invention, the roller coating amount of the UV primer and the simulated grain patterns of the digital spray-painted solid wood are reasonably controlled to form the digital spray-painted veneer with a full-closed effect, so that the problems of incapability of industrial mass production, high cost and rare raw materials are overcome compared with natural wood veneer, and the problems of fading and yellowing are avoided compared with dyed wood veneer.
Drawings
FIG. 1 is a flow chart of the process for coating veneer with the full-closed effect of the digital spray finishing.
Detailed Description
The present invention is described in further detail below with reference to examples to enable those skilled in the art to practice the same by referring to the description.
The invention provides a digital spraying veneer totally-enclosed effect cladding veneer process, which comprises the following steps:
s1: softening: immersing wood veneer with the thickness of 15-30mm in softening liquid, preferably with the dosage of the softening liquid being slightly lower than that of the wood veneer, at 55-65 ℃ for 0.5-1h, washing and drying;
the softening liquid consists of the following raw materials in parts by mass: 8-15 parts of sodium ethoxide, 10-15 parts of 1, 2-propylene diamine, 6-12 parts of an aminosilane coupling agent, 2-3 parts of a quaternary ammonium salt surfactant and 100 parts of water; the aminosilane coupling agent comprises one or more of gamma-aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane and N- (beta-aminoethyl) -gamma-aminopropyl methyl dimethoxy silane; the quaternary ammonium salt surfactant comprises one or more of didecyl dimethyl ammonium chloride, cetyl trimethyl ammonium chloride, octadecyl trimethyl ammonium bromide and dodecyl dimethyl benzyl ammonium chloride;
s2: surface treatment: uniformly coating self-repairing shape memory polymer emulsion on two side surfaces of the veneer after S1 softening treatment, wherein the single-sided coating amount is 15-20g/m 2 Then hot pressing and curing for 0.5-1h under the conditions that the pressure is 6-10MPa and the temperature is 85-120 ℃;
the self-repairing shape memory polymer emulsion is prepared from the following raw materials in parts by mass: 30-40 parts of polytetramethylene ether glycol, 20-30 parts of 4,4' -diphenylmethane diisocyanate, 12-18 parts of 2-ureido-4 [1H ] -pyrimidinone, 1-2 parts of an organotin catalyst, 15-20 parts of aqueous epoxy resin, 10-15 parts of silicone-acrylate emulsion, 20-30 parts of tetrahydrofuran and 15-25 parts of deionized water; the chemical structural formula of the 2-ureido-4 [1H ] -pyrimidinone is as follows:
the organic tin catalyst is one or more of dibutyl tin dilaurate, dibutyl tin diacetate and stannous octoate;
the preparation method of the self-repairing shape memory polymer emulsion comprises the following steps:
(1) Heating polytetramethylene ether glycol to 95-115 ℃, and vacuum dehydrating for 1-2h;
(2) Uniformly mixing dehydrated polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate and an organotin catalyst under the protection of nitrogen, and reacting for 2-3 hours at 85-95 ℃ to obtain a polyurethane prepolymer;
(3) Adding 2-ureido-4 [1H ] -pyrimidinone into tetrahydrofuran, stirring and dissolving, uniformly mixing with polyurethane prepolymer, stirring and reacting for 1.5-3 hours at 60-65 ℃, adding aqueous epoxy resin and silicone-acrylate emulsion, uniformly stirring, adding deionized water, and fully stirring to obtain the self-repairing shape memory polymer emulsion;
s3: sticking self-adhesive non-woven fabrics on one surface of the wood veneer after the S2 surface treatment, and taking the self-adhesive non-woven fabrics as the back surface of the wood veneer;
s4: the front side of the veneer after the S3 treatment is coated with the UV transparent elastic primer and the UV white high coverage primer in a roll coating way, and the roll coating amount of the UV transparent elastic primer is 15-20g/m 2 The roll coating amount of the UV white high coverage primer is 30-50g/m 2 The wood veneer is completely sealed and coated, then the solid wood simulated texture pattern is printed by digital spray painting equipment, and after ultraviolet light curing, the digital spray painting facing with the full sealing effect is formed; the UV transparent elastic primer comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester and anhydride modified epoxy acrylic acid20-25 parts of ester, 15-20 parts of styrene-acrylic emulsion, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropion and 1-5 parts of defoamer; the UV white high-coverage primer comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester, 20-25 parts of anhydride modified epoxy acrylic ester, 20-30 parts of styrene-acrylic emulsion, 25-40 parts of rutile type titanium pigment, 4-6 parts of vinyl triethoxysilane, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropion, 1-3 parts of 2-butanone peroxide and 1-5 parts of defoamer;
s5: the front side of the veneer after the S4 treatment is roller coated with UV transparent elastic finish paint, and the roller coating amount is 20-30g/m 2 After ultraviolet curing, the preparation is finished; the UV transparent elastic finishing paint comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester, 20-25 parts of polyester modified epoxy acrylic ester, 15-20 parts of styrene-acrylic emulsion, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropionic acid and 1-5 parts of defoamer.
Example 1
A digital spray finishing totally-enclosed effect wood veneer coating process comprises the following steps:
s1: the preparation method comprises the following steps:
s101: evenly mixing the following raw materials in parts by mass to prepare a softening solution: 8 parts of sodium ethoxide, 10 parts of 1, 2-propylene diamine, 6 parts of gamma-aminopropyl triethoxysilane, 2 parts of didecyl dimethyl ammonium chloride and 100 parts of water;
s102: preparing a self-repairing shape memory polymer emulsion:
(1) The preparation method comprises the following steps of: 30 parts of polytetramethylene ether glycol, 20 parts of 4,4' -diphenylmethane diisocyanate, 12 parts of 2-ureido-4 [1H ] -pyrimidinone, 1 part of dibutyl tin dilaurate, 15 parts of aqueous epoxy resin, 10 parts of silicone-acrylic emulsion, 20 parts of tetrahydrofuran and 15 parts of deionized water; the chemical structural formula of the 2-ureido-4 [1H ] -pyrimidinone is as follows:
(2) Heating polytetramethylene ether glycol to 95 ℃, and vacuum dehydrating for 1.5h;
(3) Uniformly mixing dehydrated polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate and dibutyltin dilaurate under the protection of nitrogen, and reacting at 85 ℃ for 2 hours to obtain a polyurethane prepolymer;
(4) Adding 2-ureido-4 [1H ] -pyrimidinone into tetrahydrofuran, stirring and dissolving, uniformly mixing with polyurethane prepolymer, stirring and reacting for 1.5 hours at 60 ℃, adding aqueous epoxy resin and silicone-acrylate emulsion, uniformly stirring, adding deionized water, and fully stirring to obtain the self-repairing shape memory polymer emulsion;
s103: uniformly mixing the following raw materials in parts by mass to prepare the UV transparent elastic primer: 40 parts of polyurethane acrylic ester, 20 parts of anhydride modified epoxy acrylic ester, 15 parts of styrene-acrylic emulsion, 1 part of 2-hydroxy-2-methyl-1-phenylpropion and 1 part of defoamer;
s104: the following raw materials in parts by mass are uniformly mixed to prepare the UV white high-coverage primer: 40 parts of polyurethane acrylic ester, 20 parts of anhydride modified epoxy acrylic ester, 20 parts of styrene-acrylic emulsion, 25 parts of rutile type titanium dioxide, 4 parts of vinyl triethoxysilane, 1 part of 2-hydroxy-2-methyl-1-phenylpropion, 1 part of 2-butyl ketone peroxide and 1 part of defoamer;
s105: uniformly mixing the following raw materials in parts by mass to prepare the UV transparent elastic finishing paint: 40 parts of polyurethane acrylic ester, 20 parts of polyester modified epoxy acrylic ester, 15 parts of styrene-acrylic emulsion, 1 part of 2-hydroxy-2-methyl-1-phenylpropion and 1 part of defoamer;
s2: softening: immersing veneer with the thickness of 15mm in the softening liquid obtained in the step S101, preferably, the liquid level of the softening liquid is slightly lower than that of the veneer, immersing at 55 ℃ for 0.5h, and washing and drying;
s3: surface treatment: uniformly coating S102 on the two side surfaces of the wood veneer after S2 softening treatment to obtain self-repairing shape memory polymer emulsion, wherein the single-sided coating amount is 15g/m 2 Then hot-pressing and curing for 0.5h under the conditions of 6MPa and 85 ℃;
s4: sticking self-adhesive non-woven fabrics on one surface of the wood veneer after the S3 surface treatment, and taking the self-adhesive non-woven fabrics as the back surface of the wood veneer;
s5: the UV transparent elastic primer obtained in S103 and the UV white high-coverage primer obtained in S104 are coated on the front surface of the veneer after S4 treatmentAnd the roll coating amount of the UV transparent elastic primer is 15g/m 2 The roll coating amount of the UV white high coverage primer is 30g/m 2 The wood veneer is completely sealed and coated, then the solid wood simulated texture pattern is printed by digital spray painting equipment, and after ultraviolet light curing, the digital spray painting facing with the full sealing effect is formed;
s6: the UV transparent elastic finish paint obtained by the front roller coating S105 of the wood veneer after the S5 treatment has the roller coating amount of 20g/m 2 And (3) after ultraviolet curing, obtaining the ultraviolet curing agent.
Example 2
A digital spray finishing totally-enclosed effect wood veneer coating process comprises the following steps:
s1: the preparation method comprises the following steps:
s101: evenly mixing the following raw materials in parts by mass to prepare a softening solution: 12 parts of sodium ethoxide, 13 parts of 1, 2-propylene diamine, 10 parts of N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane, 2.5 parts of cetyl trimethyl ammonium chloride and 100 parts of water;
s102: preparing a self-repairing shape memory polymer emulsion:
(1) The preparation method comprises the following steps of: 35 parts of polytetramethylene ether glycol, 25 parts of 4,4' -diphenylmethane diisocyanate, 15 parts of 2-ureido-4 [1H ] -pyrimidinone, 1.5 parts of dibutyltin diacetate, 18 parts of aqueous epoxy resin, 12 parts of silicone-acrylic emulsion, 25 parts of tetrahydrofuran and 20 parts of deionized water; the chemical structural formula of the 2-ureido-4 [1H ] -pyrimidinone is as follows:
(2) Heating polytetramethylene ether glycol to 105 ℃, and vacuum dehydrating for 1.5h;
(3) Uniformly mixing dehydrated polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate and dibutyltin diacetate under the protection of nitrogen, and reacting at 90 ℃ for 2.5 hours to obtain a polyurethane prepolymer;
(4) Adding 2-ureido-4 [1H ] -pyrimidinone into tetrahydrofuran, stirring and dissolving, uniformly mixing with polyurethane prepolymer, stirring and reacting for 2 hours at 65 ℃, adding water-based epoxy resin and silicone-acrylate emulsion, uniformly stirring, adding deionized water, and fully stirring to obtain the self-repairing shape memory polymer emulsion;
s103: uniformly mixing the following raw materials in parts by mass to prepare the UV transparent elastic primer: 45 parts of polyurethane acrylic ester, 23 parts of anhydride modified epoxy acrylic ester, 18 parts of styrene-acrylic emulsion, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropion and 1-5 parts of defoamer;
s104: the following raw materials in parts by mass are uniformly mixed to prepare the UV white high-coverage primer: 40-50 parts of polyurethane acrylic ester, 23 parts of anhydride modified epoxy acrylic ester, 25 parts of styrene-acrylic emulsion, 32 parts of rutile type titanium dioxide, 5 parts of vinyl triethoxysilane, 3 parts of 2-hydroxy-2-methyl-1-phenylpropion, 2 parts of 2-butyl ketone peroxide and 3 parts of defoamer;
s105: uniformly mixing the following raw materials in parts by mass to prepare the UV transparent elastic finishing paint: 45 parts of polyurethane acrylic ester, 23 parts of polyester modified epoxy acrylic ester, 18 parts of styrene-acrylic emulsion, 3 parts of 2-hydroxy-2-methyl-1-phenylpropion and 3 parts of defoamer;
s2: softening: immersing veneer with the thickness of 15-30mm in the softening liquid obtained in the step S101, preferably with the liquid level slightly lower than that of the veneer, for 1h at 60 ℃, washing and drying;
s3: surface treatment: uniformly coating S102 on the two side surfaces of the veneer after S2 softening treatment to obtain self-repairing shape memory polymer emulsion, wherein the single-sided coating amount is 18g/m 2 Then hot-pressing and curing for 1h under the conditions that the pressure is 8MPa and the temperature is 100 ℃;
s4: sticking self-adhesive non-woven fabrics on one surface of the wood veneer after the S3 surface treatment, and taking the self-adhesive non-woven fabrics as the back surface of the wood veneer;
s5: the front roller coating S103 of the wood veneer after the S4 treatment is carried out to obtain the UV transparent elastic primer and the UV white high-coverage primer obtained by S104, and the roller coating amount of the UV transparent elastic primer is 18g/m 2 The UV white high coverage primer had a roll coating of 40g/m 2 The wood veneer is completely sealed and coated, then the solid wood simulated texture pattern is printed by digital spray painting equipment, and after ultraviolet light curing, the digital spray painting facing with the full sealing effect is formed;
s6: the UV transparent elastic finish paint obtained by the front roller coating S105 of the wood veneer after the S5 treatment has the roller coating amount of 20-30g/m 2 And (3) after ultraviolet curing, obtaining the ultraviolet curing agent.
Example 3
A digital spray finishing totally-enclosed effect wood veneer coating process comprises the following steps:
s1: the preparation method comprises the following steps:
s101: evenly mixing the following raw materials in parts by mass to prepare a softening solution: 15 parts of sodium ethoxide, 15 parts of 1, 2-propylene diamine, 12 parts of N- (beta-aminoethyl) -gamma-aminopropyl methyl dimethoxy silane, 3 parts of dodecyl dimethyl benzyl ammonium chloride and 100 parts of water;
s102: preparing a self-repairing shape memory polymer emulsion:
(1) The preparation method comprises the following steps of: 40 parts of polytetramethylene ether glycol, 30 parts of 4,4' -diphenylmethane diisocyanate, 18 parts of 2-ureido-4 [1H ] -pyrimidinone, 2 parts of stannous octoate, 20 parts of aqueous epoxy resin, 15 parts of silicone-acrylic emulsion, 30 parts of tetrahydrofuran and 25 parts of deionized water; the chemical structural formula of the 2-ureido-4 [1H ] -pyrimidinone is as follows:
(2) Heating polytetramethylene ether glycol to 115 ℃, and dehydrating in vacuum for 2 hours;
(3) Uniformly mixing dehydrated polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate and stannous octoate under the protection of nitrogen, and reacting at 95 ℃ for 3 hours to obtain a polyurethane prepolymer;
(4) Adding 2-ureido-4 [1H ] -pyrimidinone into tetrahydrofuran, stirring and dissolving, uniformly mixing with polyurethane prepolymer, stirring and reacting for 3 hours at 65 ℃, adding water-based epoxy resin and silicone-acrylate emulsion, uniformly stirring, adding deionized water, and fully stirring to obtain the self-repairing shape memory polymer emulsion;
s103: uniformly mixing the following raw materials in parts by mass to prepare the UV transparent elastic primer: 50 parts of polyurethane acrylic ester, 25 parts of anhydride modified epoxy acrylic ester, 20 parts of styrene-acrylic emulsion, 5 parts of 2-hydroxy-2-methyl-1-phenylpropion and 5 parts of defoamer;
s104: the following raw materials in parts by mass are uniformly mixed to prepare the UV white high-coverage primer: 40-50 parts of polyurethane acrylic ester, 25 parts of anhydride modified epoxy acrylic ester, 30 parts of styrene-acrylic emulsion, 40 parts of rutile type titanium white powder, 6 parts of vinyl triethoxysilane, 5 parts of 2-hydroxy-2-methyl-1-phenylpropion, 3 parts of 2-butyl ketone peroxide and 5 parts of defoamer;
s105: uniformly mixing the following raw materials in parts by mass to prepare the UV transparent elastic finishing paint: 50 parts of polyurethane acrylic ester, 25 parts of polyester modified epoxy acrylic ester, 20 parts of styrene-acrylic emulsion, 5 parts of 2-hydroxy-2-methyl-1-phenylpropion and 5 parts of defoamer;
s2: softening: immersing wood veneer with the thickness of 30mm in the softening liquid obtained in the step S101, immersing the wood veneer at the temperature of 65 ℃ for 1 hour with the liquid level slightly lower than that of wood Pi Weiyi, washing and drying;
s3: surface treatment: uniformly coating the S102 self-repairing shape memory polymer emulsion on the two side surfaces of the veneer after S2 softening treatment, wherein the single-sided coating amount is 20g/m 2 Then hot-pressing and curing for 1h under the conditions that the pressure is 10MPa and the temperature is 120 ℃;
s4: sticking self-adhesive non-woven fabrics on one surface of the wood veneer after the S3 surface treatment, and taking the self-adhesive non-woven fabrics as the back surface of the wood veneer;
s5: the front roller coating S103 of the wood veneer after the S4 treatment is carried out to obtain the UV transparent elastic primer and the UV white high-coverage primer obtained by S104, and the roller coating amount of the UV transparent elastic primer is 20g/m 2 The UV white high coverage primer had a roll coating of 50g/m 2 The wood veneer is completely sealed and coated, then the solid wood simulated texture pattern is printed by digital spray painting equipment, and after ultraviolet light curing, the digital spray painting facing with the full sealing effect is formed;
s6: the UV transparent elastic finish paint obtained by the front roller coating S105 of the wood veneer after the S5 treatment has the roller coating amount of 30g/m 2 And (3) after ultraviolet curing, obtaining the ultraviolet curing agent.
The comparative example is the same as example 1: the difference is that: 2-ureido-4 [1H ] -pyrimidinone is not added during the preparation of the S102 self-repairing shape memory polymer emulsion.
The surface paint films of the wooden skin products of examples 1 to 3 and comparative examples, which were subjected to surface treatment by S3 and were not subjected to subsequent treatment by S4 to S6, were rubbed with a 20N scraping assembly to completely scrape the paint films on the surface of the wooden skin products, the paint film areas were used as initial scratch damage areas S1, and after heat treatment at 105 ℃ for 2 hours, the scratch damage areas S2 after the treatment were measured, the self-repairing efficiency was calculated according to the formula of 100% × (S1-S2)/S1, and the toughness and tensile strength were measured, and the test results are shown in the following table:
| example 1 | Example 2 | Example 3 | Comparative example | |
| Self-healing efficiency/% | 92.6 | 94.2 | 95.1 | 68.8 |
| Tensile Strength/MPa | 16.4 | 18.5 | 19.2 | 11.7 |
| toughness/MJ/m 3 | 25.5 | 29.7 | 32.8 | 15.3 |
As can be seen from the above table, compared with comparative example 1, the self-repairing performance, toughness and tensile strength of the veneer after the surface treatment of the self-repairing shape memory polymer emulsion in examples 1 to 3 are all significantly improved.
The self-repairing polyurethane with multiple dynamic hydrogen bonds and shape memory effect is synthesized by using polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate and 2-ureido-4 [1H ] -pyrimidinone for the first time in the embodiment 1-3, the dynamic thermal reversible quadruple hydrogen bonds are introduced into polyurethane molecular chains, the shape memory effect is used as auxiliary restoring force, and then the self-repairing polymer emulsion with the shape memory effect is prepared, under the infiltration effect, the inside of the veneer is filled with the self-repairing shape memory polymer, an integrated self-repairing shape memory polymer protective layer connected with the inside and the outside is formed, when the veneer is cracked or broken, the self-repairing shape memory polymer at the cracked or broken position is subjected to recombination and reversible exchange under the heating effect, so that the rapid and independent repairing of the veneer cracked or broken seam is realized, the repairing efficiency is high, and the repeated recycling of the veneer is realized.
Examples 1-3 pretreated wood veneer with a softening solution, sodium ethoxide and 1, 2-propylene diamine in the softening solution are used for dissolving out cellulose and hemicellulose components of the wood veneer, so that the inclination angle of wood Pi Qian wires is increased, and thus the wood veneer can be stretched and deformed within a certain angle, and can still be recovered and restored, and the shaping toughness of the wood veneer is improved, on the other hand, the softening solution breaks down hydrogen bonds and ester bonds in cellulose, hemicellulose and lignin in the wood veneer, and further improves the plasticity and relaxation performance of the wood veneer. In addition, the wood veneer is pretreated by using softening liquid, so that lignin and cellulose on the surface of the wood veneer are partially hydrolyzed, on one hand, the surface of the wood veneer is roughened, uneven micro-structure or micropore structure appears on the surface of the wood veneer, the surface load of the aminosilane coupling agent is increased, the wood veneer structure is more loose, the quaternary ammonium salt surfactant has the functions of wetting and promoting permeation, the aminosilane coupling agent is synergistically promoted to permeate into the wood veneer, the modification effect of the aminosilane coupling agent is further improved, on the other hand, due to the existence of a large number of micro-structure or micropore structure in the surface of the wood veneer, the coating and hot-pressing treatment of the self-repairing shape memory polymer emulsion are easy, the permeation of the self-repairing shape memory polymer emulsion into the wood veneer is promoted, the bonding strength is improved, and meanwhile, free-NCO, epoxy groups in the self-repairing shape memory polymer emulsion and the exposed active hydroxyl structure of the wood veneer and the aminosilane coupling agent loaded by the active hydroxyl structure are crosslinked, and the self-repairing shape memory polymer emulsion further improves the bonding strength of the self-repairing shape memory polymer emulsion.
Examples 1-3 utilize the self-repairing shape memory polymer emulsion to coat and hot-press the veneer on the surface, so that part of the veneer is permeated into the veneer to form a polymer protection layer connected with the inside and the outside, thereby increasing the flexibility of the veneer, preventing the veneer from cracking and breaking and improving the mechanical property of the veneer.
The embodiment 1-3 forms the digital spraying facing with the full-closed effect by reasonably controlling the roller coating amount of the UV primer and the digital spraying solid wood simulated grain pattern, compared with the natural wood veneer, solves the problems of incapability of industrial mass production, high cost and rare raw materials, and compared with the dyed wood veneer, the method has the advantages of no fading and yellowing.
Although embodiments of the present invention have been disclosed above, it is not limited to the use of the description and embodiments, it is well suited to various fields of use for the invention, and further modifications may be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the particular details without departing from the general concepts defined in the claims and the equivalents thereof.
Claims (10)
1. The process for coating the veneer with the digital spraying veneer totally-enclosed effect is characterized by comprising the following steps of:
s1: softening: soaking veneer with thickness of 15-30mm in softening solution at 55-65deg.C for 0.5-1 hr, washing, and drying;
the softening liquid consists of the following raw materials in parts by mass: 8-15 parts of sodium ethoxide, 10-15 parts of 1, 2-propylene diamine, 6-12 parts of an aminosilane coupling agent, 2-3 parts of a quaternary ammonium salt surfactant and 100 parts of water;
s2: surface treatment: uniformly coating self-repairing shape memory polymer emulsion on two side surfaces of the veneer after S1 softening treatment, wherein the single-sided coating amount is 15-20g/m 2 Then hot pressing and curing for 0.5-1h under the conditions that the pressure is 6-10MPa and the temperature is 85-120 ℃;
the self-repairing shape memory polymer emulsion is prepared from the following raw materials in parts by mass: 30-40 parts of polytetramethylene ether glycol, 20-30 parts of 4,4' -diphenylmethane diisocyanate, 12-18 parts of 2-ureido-4 [1H ] -pyrimidinone, 1-2 parts of an organotin catalyst, 15-20 parts of aqueous epoxy resin, 10-15 parts of silicone-acrylate emulsion, 20-30 parts of tetrahydrofuran and 15-25 parts of deionized water;
s3: sticking self-adhesive non-woven fabrics on one surface of the wood veneer after the S2 surface treatment, and taking the self-adhesive non-woven fabrics as the back surface of the wood veneer;
s4: the front side of the veneer after the S3 treatment is coated with the UV transparent elastic primer and the UV white high coverage primer in a roll coating way, and the roll coating amount of the UV transparent elastic primer is 15-20g/m 2 The roll coating amount of the UV white high coverage primer is 30-50g/m 2 The wood veneer is completely sealed and coated, then the solid wood simulated texture pattern is printed by digital spray painting equipment, and after ultraviolet light curing, the digital spray painting facing with the full sealing effect is formed;
s5: the front side of the veneer after the S4 treatment is roller coated with UV transparent elastic finish paint, and the roller coating amount is 20-30g/m 2 And (3) after ultraviolet curing, obtaining the ultraviolet curing agent.
2. The process for coating wood veneer with full-closed effect by digital spraying decoration according to claim 1, wherein the dosage of the softening liquid is preferably slightly lower than the wood veneer.
3. The digital spray veneer fully-enclosed effect coated veneer according to claim 1, wherein the aminosilane coupling agent comprises one or more of gamma-aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl methyldimethoxysilane.
4. The process for coating veneer with a totally enclosed effect according to claim 1, wherein the quaternary ammonium salt surfactant comprises one or more of didecyl dimethyl ammonium chloride, cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium bromide, and dodecyl dimethyl benzyl ammonium chloride.
5. The process for coating wood veneer with full-closed effect by digital spraying decoration according to claim 1, wherein the chemical structural formula of the 2-ureido-4 [1H ] -pyrimidinone is as follows:
6. the process for coating wood veneer with full-closed effect by digital spraying decoration according to claim 1, wherein the organotin catalyst is one or more of dibutyl tin dilaurate, dibutyl tin diacetate and stannous octoate.
7. The process for coating wood veneer with full-closed effect by digital spraying decoration surface according to claim 1, wherein the preparation method of the self-repairing shape memory polymer emulsion is as follows:
(1) Heating polytetramethylene ether glycol to 95-115 ℃, and vacuum dehydrating for 1-2h;
(2) Uniformly mixing dehydrated polytetramethylene ether glycol, 4' -diphenylmethane diisocyanate and an organotin catalyst under the protection of nitrogen, and reacting for 2-3 hours at 85-95 ℃ to obtain a polyurethane prepolymer;
(3) Adding 2-ureido-4 [1H ] -pyrimidinone into tetrahydrofuran, stirring and dissolving, uniformly mixing with polyurethane prepolymer, stirring and reacting for 1.5-3 hours at 60-65 ℃, adding aqueous epoxy resin and silicone-acrylate emulsion, uniformly stirring, adding deionized water, and fully stirring to obtain the self-repairing shape memory polymer emulsion.
8. The digital spray finishing totally-enclosed effect coated veneer according to claim 1, wherein the UV transparent elastic primer comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester, 20-25 parts of anhydride modified epoxy acrylic ester, 15-20 parts of styrene-acrylic emulsion, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropionic acid and 1-5 parts of defoamer.
9. The digital spray finishing totally-enclosed effect coated veneer according to claim 1, wherein the UV white high coverage primer comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester, 20-25 parts of anhydride modified epoxy acrylic ester, 20-30 parts of styrene-acrylic emulsion, 25-40 parts of rutile type titanium pigment, 4-6 parts of vinyl triethoxysilane, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropionic acid, 1-3 parts of 2-butanone peroxide and 1-5 parts of defoamer.
10. The digital spray finishing totally-enclosed effect coated veneer according to claim 1, wherein the UV transparent elastic finishing paint comprises the following raw materials in parts by mass: 40-50 parts of polyurethane acrylic ester, 20-25 parts of polyester modified epoxy acrylic ester, 15-20 parts of styrene-acrylic emulsion, 1-5 parts of 2-hydroxy-2-methyl-1-phenylpropionic acid and 1-5 parts of defoamer.
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| CN104356338A (en) * | 2014-10-30 | 2015-02-18 | 华南理工大学 | Self-repairing polyurethane coating and preparation method thereof |
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