CN117757347B - Weather-resistant wood grain wood powder coating and preparation method thereof - Google Patents
Weather-resistant wood grain wood powder coating and preparation method thereof Download PDFInfo
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- CN117757347B CN117757347B CN202311712172.7A CN202311712172A CN117757347B CN 117757347 B CN117757347 B CN 117757347B CN 202311712172 A CN202311712172 A CN 202311712172A CN 117757347 B CN117757347 B CN 117757347B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims abstract description 51
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- 239000004814 polyurethane Substances 0.000 claims abstract description 40
- -1 titanium dioxide-toluene diisocyanate Chemical compound 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
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- 239000002994 raw material Substances 0.000 claims abstract description 7
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- 239000004593 Epoxy Substances 0.000 claims description 28
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 28
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 26
- 239000003054 catalyst Substances 0.000 claims description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 239000004408 titanium dioxide Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 125000005442 diisocyanate group Chemical group 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 9
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 9
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
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- 150000002513 isocyanates Chemical class 0.000 claims description 8
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- 229920005862 polyol Polymers 0.000 claims description 8
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- 238000006243 chemical reaction Methods 0.000 claims description 7
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- 150000001335 aliphatic alkanes Chemical group 0.000 claims description 6
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- 238000000034 method Methods 0.000 claims description 6
- 239000001038 titanium pigment Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 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 4
- YSWBFLWKAIRHEI-UHFFFAOYSA-N 4,5-dimethyl-1h-imidazole Chemical compound CC=1N=CNC=1C YSWBFLWKAIRHEI-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
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- 238000000926 separation method Methods 0.000 claims description 4
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical group [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 4
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 claims description 2
- ULKLGIFJWFIQFF-UHFFFAOYSA-N 5K8XI641G3 Chemical compound CCC1=NC=C(C)N1 ULKLGIFJWFIQFF-UHFFFAOYSA-N 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
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- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical group O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 description 6
- 230000009471 action Effects 0.000 description 5
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 5
- 230000003078 antioxidant effect Effects 0.000 description 5
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- 238000005299 abrasion Methods 0.000 description 4
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- 239000002202 Polyethylene glycol Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 3
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
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- DSKYSDCYIODJPC-UHFFFAOYSA-N 2-butyl-2-ethylpropane-1,3-diol Chemical compound CCCCC(CC)(CO)CO DSKYSDCYIODJPC-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
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- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The application relates to the field of coatings, in particular to a weather-resistant wood grain powder coating and a preparation method thereof. A weather-resistant wood grain powder coating comprises the following raw materials in parts by weight: 38-45 parts of titanium dioxide-toluene diisocyanate modified polyurethane; 8-12 parts of acrylic resin; 8-13 parts of curing agent; 3-5 parts of hydroxypropyl cellulose composite sericite powder; 0.7-1.2 parts of curing accelerator; 0.3-0.5 part of ultraviolet absorber; 30-35 parts of pigment and filler; 0.5-1 part of auxiliary agent. The application has the characteristic of improving the weather resistance of the wood grain powder coating.
Description
Technical Field
The application relates to the field of coatings, in particular to a weather-resistant wood grain powder coating and a preparation method thereof.
Background
The powder coating is a novel 100% solid powdery environment-friendly coating without solvent. The powder paint is generally composed of solid resin, pigment, filler, assistant and the like, and has the advantages of high coating efficiency, good protection and decoration properties and the like.
Among them, the application of wood grain powder coating is wider. The appearance effect of the profile processed by the wood grain powder coating is close to that of a wood product, and the wood grain powder coating can form a coating film on the surface of the profile, so that the effects of corrosion resistance and decoration are achieved; therefore, the wood grain powder coating can be widely used in industries such as construction and furniture, so as to reduce the use of natural wood and further achieve the effect of environmental protection.
However, the existing wood grain powder coating has poor weather resistance, and after outdoor sun-drying and rain-spraying for a period of time, the glossiness of a coating film on the surface of the profile is reduced, and cracks appear on the surface of the coating film.
Disclosure of Invention
In order to improve the weather resistance of the wood grain powder coating, the application provides a weather-resistant wood shaving wood grain powder coating and a preparation method thereof.
In a first aspect, the application provides a weather-resistant wood grain powder coating, which adopts the following technical scheme:
a weather-resistant wood grain powder coating comprises the following raw materials in parts by weight:
38-45 parts of titanium dioxide-toluene diisocyanate modified polyurethane;
8-12 parts of acrylic resin;
8-13 parts of curing agent;
3-5 parts of hydroxypropyl cellulose composite sericite powder;
0.7-1.2 parts of curing accelerator;
0.3-0.5 part of ultraviolet absorber;
30-35 parts of pigment and filler;
0.5-1 part of auxiliary agent.
By adopting the technical scheme, the acrylic resin and polyurethane are matched according to a certain proportion, so that the wood grain powder coating with better weather resistance can be prepared; meanwhile, under the modification effect of titanium dioxide-toluene diisocyanate on polyurethane, the toughness and the photo-aging oxidation resistance of the paint film of the wood grain powder paint are improved, so that the phenomenon of cracking of the paint film is reduced; secondly, the internal structure of the wood grain powder coating is consolidated by filling the sericite powder, and under the filling effect of the sericite powder, the structural stability of the wood grain powder coating is improved, and the improvement of the abrasion resistance, the heat resistance and the impermeability of the wood grain powder coating is facilitated, so that the weather resistance of the wood grain powder coating is further improved; then, under the modification effect of the hydroxypropyl cellulose, the compatibility between the sericite powder and the wood grain powder coating is improved, and chemical bonding is formed between the hydroxypropyl cellulose and the titanium dioxide-toluene diisocyanate, so that the internal connection compactness of the wood grain powder coating is further improved, the internal interaction force is improved, the structural stability of the wood grain powder coating is further improved, and the toughness, the photo-aging oxidation resistance and the weather resistance of the wood grain powder coating are further improved.
Preferably, the acrylic resin is selected from the group consisting of acrylic resins BR-116.
Preferably, the preparation raw materials of the titanium dioxide-toluene diisocyanate modified polyurethane comprise titanium dioxide, toluene diisocyanate, polyether polyol, diisocyanate, dihydric alcohol containing side alkane groups and a first catalyst, wherein the weight ratio of the titanium dioxide to the toluene diisocyanate to the polyether polyol to the diisocyanate to the dihydric alcohol containing the side alkane groups to the first catalyst is (1.5-2): (3-3.8): (55-65): (45-50): (3-5): (0.03-0.05).
By adopting the technical scheme, the titanium dioxide-toluene diisocyanate is generated through the reaction and combination of the titanium dioxide and toluene diisocyanate; then, under the catalysis of a first catalyst, promoting the reaction and combination of polyether polyol and diisocyanate, and under the action of dihydric alcohol containing side alkane, polyurethane with better toughness and abrasion resistance can be prepared; finally, the toughness and the photo-aging oxidation resistance of the polyurethane are improved by modifying the polyurethane by the titanium dioxide-toluene diisocyanate, so that the phenomenon of paint film cracking is reduced.
Preferably, the polyether polyol is selected from one or more of polyethylene glycol, polypropylene glycol and polytetramethylene glycol.
Preferably, the diisocyanate is selected from one or two of diphenylmethane diisocyanate and xylylene diisocyanate.
Preferably, the dihydric alcohol containing side alkane is selected from one or two of 1-3 butanediol and 2-butyl-2-ethyl-1, 3-propanediol.
Preferably, the first catalyst is selected from stannous octoate.
Preferably, the preparation raw materials of the hydroxypropyl cellulose composite sericite powder comprise hydroxypropyl cellulose, an epoxy silane coupling agent, sericite powder, a second catalyst and a first solvent, wherein the weight ratio of the hydroxypropyl cellulose to the epoxy silane coupling agent to the sericite powder to the second catalyst to the first solvent is (20-30): (2.5-3.2): (15-25): (0.3-0.5): (60-65).
By adopting the technical scheme, the sericite powder is modified by the epoxy silane coupling agent to obtain the epoxy silane coupling agent modified sericite powder, so that the combination property of the sericite powder and the hydroxypropyl cellulose is improved, and the modification effect of the hydroxypropyl cellulose on the sericite powder is realized stably; and then, under the action of a second catalyst, the hydroxypropyl cellulose and the epoxy silane coupling agent modified sericite powder are compounded, so that the modification effect of the hydroxypropyl cellulose on the sericite powder is realized, the compatibility between the sericite powder and the wood grain powder coating is improved, the internal connection compactness of the wood grain powder coating is enhanced through the hydroxypropyl cellulose, the promotion effect of the sericite powder is more stably exerted, the structural stability of the wood grain powder coating is further improved, the improvement of the wear resistance, the heat resistance and the impermeability of the wood grain powder coating is facilitated, and the weather resistance of the wood grain powder coating is further improved.
Preferably, the epoxy silane coupling agent is selected from KH-560.
Preferably, the first solvent is selected from ethanol.
Preferably, the second catalyst is selected from tertiary ammonium.
Preferably, the curing agent comprises an isocyanate curing agent and a hydroxyalkylamide curing agent, wherein the weight ratio of the isocyanate curing agent to the hydroxyalkylamide curing agent is (9-13): (0.8-1.2).
By adopting the technical scheme, the isocyanate curing agent and the hydroxyalkyl amide curing agent are combined in a certain proportion, so that the isocyanate curing agent and the hydroxyalkyl amide curing agent complement each other, the promotion initiation effect of the curing agent is improved, the curing effect of the wood grain powder coating is further effectively improved, and the toughness and weather resistance of the wood grain powder coating are further improved.
Preferably, the isocyanate curing agent is selected from triglycidyl isocyanurate.
Preferably, the hydroxyalkylamide curing agent is selected from the group consisting of beta-hydroxyalkylamides.
Preferably, the pigment and filler comprises titanium dioxide and silica micropowder, wherein the weight ratio of the titanium dioxide to the silica micropowder is (17-25): (10-18).
Through adopting above-mentioned technical scheme, titanium white powder and silicon micropowder both combine with certain proportion, make both produce synergistic effect, be favorable to increasing the utilization ratio of titanium white powder to increase the compatibility of pigment filler in wood flour powder coating, thereby further strengthen the inner structure of wood grain powder coating, with the improvement that further realizes wood grain powder coating weatherability.
Preferably, the curing accelerator is selected from one or two of dimethyl imidazole and 2-ethyl-4-methyl imidazole.
By adopting the technical scheme, the combination effect of the curing accelerator and the wood grain powder coating is good, the occurrence of curing reaction can be effectively promoted, and the abrasion resistance and weather resistance of the wood grain powder coating can be further improved.
Preferably, the ultraviolet absorber is selected from one or both of UV-531 and UV-326.
By adopting the technical scheme, the ultraviolet absorber has better combination effect with the wood grain powder coating, can effectively absorb ultraviolet radiation, so as to reduce the irradiation and damage of ultraviolet to a paint film, further improve the photo-aging oxidation resistance of the wood grain powder coating, and reduce the phenomena of light loss and cracking of the paint film.
Preferably, the auxiliary agent is selected from one or two of an antioxidant and a leveling agent.
In a second aspect, the application provides a preparation method of weather-resistant wood grain powder coating, which adopts the following preparation scheme: a weather-resistant wood grain wood powder coating comprising the steps of:
Firstly, uniformly mixing titanium dioxide-toluene diisocyanate modified polyurethane, acrylic resin, a curing agent, hydroxypropyl cellulose composite sericite powder, a curing accelerator, an ultraviolet absorber, pigment and filler and an auxiliary agent to obtain a mixed prefabricated product; and then, carrying out melt extrusion, tabletting, crushing, grinding and cyclone separation on the mixed prefabricated product at 180-220 ℃ to obtain the weather-resistant wood grain powder coating.
By adopting the technical scheme, the wood grain powder coating prepared by the preparation method has the characteristic of stable structure, and is beneficial to realizing the improvement of the toughness and weather resistance of the wood grain powder coating.
Preferably, the preparation method of the titanium dioxide-toluene diisocyanate modified polyurethane comprises the following steps: firstly, mixing and stirring titanium dioxide and toluene diisocyanate, heating to 55-60 ℃, and reacting for 0.5-1h to obtain titanium dioxide-toluene diisocyanate; then, uniformly mixing polyether polyol, diisocyanate and a first catalyst, heating to 70-75 ℃ in a water bath, stirring for 1-2h, cooling to 55-60 ℃, adding dihydric alcohol containing side alkyl groups, and stirring for reacting for 15-30min to obtain a polyurethane preform; and then mixing the prepared titanium dioxide-toluene diisocyanate with a polyurethane preformed material, stirring and reacting for 3-4 hours, finally discharging, cooling and crushing to obtain the titanium dioxide-toluene diisocyanate modified polyurethane.
By adopting the technical scheme, the titanium dioxide-toluene diisocyanate modified polyurethane prepared by the preparation method can effectively improve the toughness and the photo-aging oxidation resistance of the polyurethane, thereby being beneficial to reducing the occurrence of the phenomenon of paint film cracking.
Preferably, the preparation method of the hydroxypropyl cellulose composite sericite powder comprises the following steps: firstly, mixing and stirring sericite powder, an epoxy silane coupling agent and a first solvent, heating to 50-60 ℃ and reacting for 1-2 hours to obtain epoxy silane coupling agent modified sericite powder; then adding hydroxypropyl cellulose and a second catalyst, mixing and stirring, heating to 65-70 ℃, and reacting for 2-3h; and after the reaction is finished, filtering, collecting a filter body, and drying the filter body to obtain the hydroxypropyl cellulose composite sericite powder.
By adopting the technical scheme, under the action of the first solvent, the epoxy silane coupling agent is fully contacted with the sericite powder, so that the modified compounding of the epoxy silane coupling agent and the sericite powder is facilitated, and the epoxy silane coupling agent modified sericite powder with better surface activity is prepared; and then, under the action of a second catalyst, catalyzing and promoting the epoxy silane coupling agent to react with the hydroxypropyl cellulose to form chemical bonding, so that the structural stability of the hydroxypropyl cellulose composite sericite powder is improved, and the hydroxypropyl cellulose composite sericite powder with stable structure and strong surface performance is obtained.
In summary, the present application includes at least one of the following beneficial technical effects:
1. The wood grain powder coating with better weather resistance can be prepared by matching acrylic resin with polyurethane according to a certain proportion; meanwhile, under the modification effect of titanium dioxide-toluene diisocyanate on polyurethane, the toughness and the photo-aging oxidation resistance of the paint film of the wood grain powder paint are improved, so that the phenomenon of cracking of the paint film is reduced; secondly, the internal structure of the wood grain powder coating is consolidated by filling the sericite powder, the structural stability of the wood grain powder coating is improved, and the improvement of the abrasion resistance, the heat resistance and the impermeability of the wood grain powder coating is facilitated, so that the weather resistance of the wood grain powder coating is further improved; then, under the modification effect of the hydroxypropyl cellulose, the compatibility between the sericite powder and the wood grain powder coating is improved, and chemical bonding is formed between the hydroxypropyl cellulose and the titanium dioxide-toluene diisocyanate, so that the internal connection compactness of the wood grain powder coating is further improved, the internal interaction force is improved, the structural stability of the wood grain powder coating is further improved, and the toughness, the photo-aging oxidation resistance and the weather resistance of the wood grain powder coating are further improved;
2. The sericite powder is modified by an epoxy silane coupling agent, so that the epoxy silane coupling agent modified sericite powder with better surface activity is prepared, and the combination property of the sericite powder and hydroxypropyl cellulose is improved; then, under the action of a second catalyst, the hydroxypropyl cellulose and the epoxy silane coupling agent modified sericite powder are compounded, so that the modification effect of the hydroxypropyl cellulose on the sericite powder is realized, the compatibility between the sericite powder and the wood grain powder coating is improved, the internal connection compactness of the wood grain powder coating is enhanced through the hydroxypropyl cellulose, the promotion effect of the sericite powder is more stably exerted, the structural stability of the wood grain powder coating is further improved, the improvement of the wear resistance, the heat resistance and the impermeability of the wood grain powder coating is facilitated, and the weather resistance of the wood grain powder coating is further improved;
3. the isocyanate curing agent and the hydroxyalkyl amide curing agent are combined in a certain proportion, so that the isocyanate curing agent and the hydroxyalkyl amide curing agent complement each other, the promotion and initiation effects of the curing agent are improved, the curing effect of the wood grain powder coating is effectively improved, and the toughness and weather resistance of the wood grain powder coating are further improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The leveling agent is selected from a leveling agent STA-3358;
the antioxidant is selected from antioxidant 1035.
Preparation example
Preparation example 1
Preparation of titanium dioxide-toluene diisocyanate modified polyurethane:
firstly, 150g of titanium dioxide and 300g of toluene diisocyanate are mixed and stirred, and react for 0.5h at 55 ℃ to obtain titanium dioxide-toluene diisocyanate; then, 5500g of polyethylene glycol with molecular weight of 1500, 4500g of diphenylmethane diisocyanate and 3g of stannous octoate are uniformly mixed, heated to 70 ℃ in a water bath, stirred and reacted for 1 hour, cooled to 55 ℃, added with 300g of 1-3 butanediol, stirred and reacted for 15 minutes to obtain a polyurethane preform; and then mixing the prepared titanium dioxide-toluene isocyanate with polyurethane preformed material, stirring and reacting for 3 hours, finally discharging, cooling and crushing to obtain the titanium dioxide-toluene diisocyanate modified polyurethane.
Preparation example 2
Preparation of titanium dioxide-toluene diisocyanate modified polyurethane:
Firstly, 200g of titanium dioxide and 380g of toluene diisocyanate are mixed and stirred, and react for 1h at 60 ℃ to obtain titanium dioxide-toluene diisocyanate; then, 6500g of polyethylene glycol with molecular weight of 1500, 5000g of diphenylmethane diisocyanate and 5g of stannous octoate are uniformly mixed, heated to 75 ℃ in water bath, stirred and reacted for 2 hours, cooled to 60 ℃, added with 500g of 1-3 butanediol, stirred and reacted for 30 minutes to obtain polyurethane prefabricate; and then mixing the prepared titanium dioxide-toluene isocyanate with polyurethane preformed material, stirring and reacting for 4 hours, finally discharging, cooling and crushing to obtain the titanium dioxide-toluene diisocyanate modified polyurethane.
Preparation example 3
Preparing hydroxypropyl cellulose composite sericite powder:
Firstly, 1500g of sericite powder, 250gKH-560 and 6000g of ethanol are mixed and stirred and react for 1h at 50 ℃ to obtain epoxy silane coupling agent modified sericite powder; then, 2000g of hydroxypropyl cellulose and 30g of tertiary amine are added, mixed and stirred, and reacted for 2 hours at 65 ℃; after the reaction is finished, filtering to obtain a filter body, and then drying in a drying box at 60 ℃ for 1h to obtain the hydroxypropyl cellulose composite sericite powder.
Preparation example 4
Preparing hydroxypropyl cellulose composite sericite powder:
Firstly, 2500g of sericite powder, 320-gKH-560 and 6500g of ethanol are mixed and stirred, and react for 2 hours at 60 ℃ to obtain epoxy silane coupling agent modified sericite powder; then, 3000g of hydroxypropyl cellulose and 50g of tertiary amine are added, mixed and stirred, and reacted for 3 hours at 70 ℃; after the reaction is finished, filtering to obtain a filter body, and then drying in a drying box at 60 ℃ for 1h to obtain the hydroxypropyl cellulose composite sericite powder.
Examples
Example 1
The preparation of the weather-resistant wood grain powder coating comprises the following steps:
3800g of titanium dioxide-toluene diisocyanate modified polyurethane of preparation example 1, 800g of acrylic resin BR-116, 800g of curing agent, 300g of hydroxypropyl cellulose modified sericite powder of preparation example 3, 70g of dimethyl imidazole, 30g of UV-531, 3000g of pigment and filler, 20g of leveling agent STA-3358 and 30g of antioxidant 1035 are uniformly mixed to obtain a mixed prefabricated product; then, the mixed prefabricated material is subjected to melt extrusion, tabletting, crushing, grinding and cyclone separation at 180 ℃ to prepare weather-resistant wood grain powder coating;
Wherein the curing agent consists of 735g of triglycidyl isocyanurate and 65g of beta-hydroxyalkylamide; the pigment and filler consists of 1889g of titanium dioxide and 1111g of silica micropowder.
Example 2
The preparation of the weather-resistant wood grain powder coating comprises the following steps:
firstly, 4500g of titanium dioxide-toluene diisocyanate modified polyurethane of preparation example 2, 1200g of acrylic resin BR-116, 1300g of curing agent, 500g of hydroxypropyl cellulose modified sericite powder of preparation example 4, 120g of dimethyl imidazole, 50g of UV-531, 3500g of pigment and filler, 40g of flatting agent STA-3358 and 60g of antioxidant 1035 are uniformly mixed to obtain a mixed prefabricated product; then, the mixed prefabricated material is subjected to melt extrusion, tabletting, crushing, grinding and cyclone separation at 220 ℃ to prepare the weather-resistant wood grain powder coating;
wherein the curing agent consists of 1194g of triglycidyl isocyanurate and 106g of beta-hydroxyalkylamide; the pigment and filler consists of 2204g of titanium pigment and 1296g of silicon micropowder.
Example 3
The preparation of the weather-resistant wood grain powder coating comprises the following steps:
This example differs from example 2in that 1300g triglycidyl isocyanurate was specifically used as the curing agent.
Example 4
The preparation of the weather-resistant wood grain powder coating comprises the following steps:
this example differs from example 2 in that 1300g of beta-hydroxyalkylamide is specifically selected as the curing agent.
Example 5
The preparation of the weather-resistant wood grain powder coating comprises the following steps:
The difference between this example and example 2 is that 3500g titanium pigment is specifically selected as the pigment and filler.
Comparative example
Comparative example 1
This comparative example differs from example 2 in that the polyurethane preform prepared in preparation example 2 was added instead of the titanium dioxide-toluene diisocyanate-modified polyurethane, i.e., without adding the titanium dioxide-toluene diisocyanate-modified polyurethane.
Comparative example 2
This comparative example is different from example 2 in that the hydroxypropyl cellulose composite sericite powder was not added.
Comparative example 3
The comparative example is different from example 2 in that the same amount of sericite powder was used instead of the hydroxypropylcellulose composite sericite powder, i.e., the hydroxypropylcellulose composite sericite powder was not added and 500g of sericite powder was added.
Comparative example 4
The comparative example is different from example 2 in that the same amount of the epoxy silane coupling agent modified sericite powder prepared in preparation example 4 was used instead of the hydroxypropyl cellulose composite sericite powder, i.e., the hydroxypropyl cellulose composite sericite powder was not added, and 500g of the epoxy silane coupling agent modified sericite powder prepared in preparation example 4 was added.
Performance test
1. Flexibility: the coating materials of examples 1 to 5 and comparative examples 1 to 4 were sprayed on a substrate with a thickness of 80. Mu.m, and then placed in a medium-wave infrared furnace (TRIAB, sweden) at a curing temperature of 150℃for 1min, and then taken out to obtain a tin plate cured with different coatings, and after standing for 48 hours, the coating layers formed on the tin plate were subjected to a flexibility test with reference to GB/T1731-2020 "paint film, putty film flexibility test", and the minimum shaft bar diameter at which no moire, crack and peeling phenomenon were observed was recorded, and the test results are shown in Table 1.
2. Light aging oxidation resistance: taking an aluminum substrate as a substrate, respectively spraying powder coatings in examples 1-5 and comparative examples 1-4 on the aluminum substrate to a thickness of 80 mu m, then placing the aluminum substrate in a medium-wave infrared furnace (TRIAB in Sweden), setting the curing temperature to 150 ℃, curing for 1min, taking out the aluminum substrate, finally preparing aluminum substrates cured with different coatings, and after standing for 48h, referring to GB/T1865-2009 (color paint and varnish artificial climate ageing and artificial radiation exposure filtered xenon arc radiation), and adopting a method 1 to test the photo-aging oxidation resistance of each sample, wherein the specific operation is as follows: the wavelength is controlled to be 400nm, and the ageing is continuously carried out for 1000 hours, 1500 hours and 2000 hours. And then the rating of the photo-aging oxidation resistance of the coating is carried out by referring to the light loss rating method in GB/T1766-2008 'rating method for ageing of paint and varnish coatings'. Wherein the light-loss level is divided into 6 levels of 0,1, 2, 3, 4 and 5, the lower the level is, the better the weather resistance of the coating is, and the test result is shown in table 1.
3. Weather resistance: the tinplate is taken as a substrate, powder coatings in examples 1-5 and comparative examples 1-4 are respectively sprayed on the substrate, the sprayed thickness is 80 mu m, then the substrate is placed in a medium-wave infrared furnace (TRIAB in Sweden), the curing temperature is set to be 150 ℃, the tinplate is taken out after being cured for 1min, finally the tinplate with different coatings is prepared, after standing for 48h, the test is carried out by referring to GB/T1733-1993 paint film water resistance measuring method, the test is carried out by adopting an ethylene method, and the time when any phenomena such as light loss, color change, foaming, wrinkling, falling and rusting occur on each test is recorded, namely the longest boiling water resistance time, and the test results are shown in Table 1.
TABLE 1
Combining example 2 with comparative example 1 and combining the data in table 1, it is known that the toughness, photo-aging oxidation resistance and weather resistance of the powder paint film are respectively reduced to different degrees by adopting polyurethane preformed material to replace titanium dioxide-toluene diisocyanate modified polyurethane to prepare the wood grain powder paint, wherein the toughness and photo-aging oxidation resistance of the powder paint film of comparative example 1 are greatly reduced compared with those of example 2, and it is proved that the titanium dioxide-toluene diisocyanate is required to modify polyurethane to effectively improve the toughness, photo-aging oxidation resistance and weather resistance of the wood grain powder paint film, and the modification effect of the titanium dioxide-toluene diisocyanate has a great promoting effect on improving the toughness and photo-aging oxidation resistance of the wood grain powder paint.
As can be seen from the combination of example 2 and comparative example 2 and the data in table 1, the minimum shaft diameter and the light loss level of example 2 are smaller, and the longest boiling water time is longer, wherein the difference between the longest boiling water time of comparative example 2 and that of example 2 is more obvious, which indicates that the addition of the hydroxypropyl cellulose composite sericite powder for preparing the wood grain powder coating can effectively improve the toughness, the light-resistant and the aging oxidation resistance and the weather resistance of the powder coating, and the addition of the hydroxypropyl cellulose composite sericite powder has a larger promoting effect on improving the weather resistance of the wood grain powder coating.
As can be seen from the combination of comparative example 2 and comparative examples 3 to 4 and the data in table 1, the weather resistance of comparative example 3 is improved as compared with comparative example 2, but the improvement is smaller as compared with example 2, indicating that the improvement of weather resistance of the wood grain powder coating is not greatly promoted by adding sericite powder alone; according to comparative example 4, the epoxy silane coupling agent is added to modify the sericite powder, however, the epoxy silane coupling agent modifies the sericite powder, and the promotion effect of improving the weather resistance of the wood grain powder coating is not obvious, which indicates that the hydroxypropyl cellulose is required to carry out composite modification on the epoxy silane coupling agent modified sericite powder so as to achieve better effect; therefore, the modified sericite powder is firstly modified by the epoxy silane coupling agent to improve the combination property of the sericite powder and the hydroxypropyl cellulose, and then the hydroxypropyl cellulose is added to be compounded with the modified sericite powder by the epoxy silane coupling agent, so that the weather resistance of the wood grain powder coating can be effectively improved, and the toughness and the photo-aging oxidation resistance of a paint film of the wood grain powder coating are improved to a certain extent.
As can be seen from the combination of examples 2 and 3 to 5 and the data in table 1, when the wood grain powder coating is synthesized by using triglycidyl isocyanurate alone or using β -hydroxyalkylamide alone as the curing agent, the toughness and weather resistance of the paint film of the wood grain powder coating are both reduced, which means that the combination of triglycidyl isocyanurate and β -hydroxyalkylamide in a specific ratio can effectively improve the curing effect of the wood grain powder coating, thereby being beneficial to better improving the toughness and weather resistance of the wood grain powder coating; meanwhile, according to the embodiment 5, when titanium pigment is singly used as pigment and filler to synthesize the wood grain powder coating, the toughness and weather resistance of a paint film of the wood grain powder coating are reduced, which indicates that the combination of the titanium pigment and the silicon micropowder in a specific proportion can effectively strengthen the internal structure of the wood grain powder coating, thereby improving the toughness and weather resistance of the wood grain powder coating.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (6)
1. The weather-resistant wood grain powder coating is characterized by comprising the following raw materials in parts by weight:
38-45 parts of titanium dioxide-toluene diisocyanate modified polyurethane;
8-12 parts of acrylic resin;
8-13 parts of curing agent;
3-5 parts of hydroxypropyl cellulose composite sericite powder;
0.7-1.2 parts of curing accelerator;
0.3-0.5 part of ultraviolet absorber;
30-35 parts of pigment and filler;
0.5-1 part of auxiliary agent;
The preparation raw materials of the titanium dioxide-toluene diisocyanate modified polyurethane comprise titanium dioxide, toluene diisocyanate, polyether polyol, diisocyanate, dihydric alcohol containing side alkane groups and a first catalyst, wherein the weight ratio of the titanium dioxide to the toluene diisocyanate to the polyether polyol to the diisocyanate to the dihydric alcohol containing the side alkane groups to the first catalyst is (1.5-2): (3-3.8): (55-65): (45-50): (3-5): (0.03-0.05);
The preparation method of the titanium dioxide-toluene diisocyanate modified polyurethane comprises the following steps: firstly, mixing and stirring titanium dioxide and toluene diisocyanate, heating to 55-60 ℃, and reacting for 0.5-1h to obtain titanium dioxide-toluene diisocyanate; then, uniformly mixing polyether polyol, diisocyanate and a first catalyst, heating to 70-75 ℃ in a water bath, stirring for 1-2h, cooling to 55-60 ℃, adding dihydric alcohol containing side alkyl groups, and stirring for reacting for 15-30min to obtain a polyurethane preform; then mixing the prepared titanium dioxide-toluene diisocyanate with polyurethane preformed material, stirring and reacting for 3-4 hours, finally discharging, cooling and crushing to obtain titanium dioxide-toluene diisocyanate modified polyurethane;
the diisocyanate is selected from one or two of diphenylmethane diisocyanate and xylylene diisocyanate; the first catalyst is selected from stannous octoate;
The preparation raw materials of the hydroxypropyl cellulose composite sericite powder comprise hydroxypropyl cellulose, an epoxy silane coupling agent, sericite powder, a second catalyst and a first solvent, wherein the weight ratio of the hydroxypropyl cellulose to the epoxy silane coupling agent to the sericite powder to the second catalyst to the first solvent is (20-30): (2.5-3.2): (15-25): (0.3-0.5): (60-65);
The preparation method of the hydroxypropyl cellulose composite sericite powder comprises the following steps: firstly, mixing and stirring sericite powder, an epoxy silane coupling agent and a first solvent, heating to 50-60 ℃ and reacting for 1-2 hours to obtain epoxy silane coupling agent modified sericite powder; then adding hydroxypropyl cellulose and a second catalyst, mixing and stirring, heating to 65-70 ℃, and reacting for 2-3h; filtering after the reaction is finished, collecting a filter body, and drying the filter body to obtain hydroxypropyl cellulose composite sericite powder;
The second catalyst is selected from tertiary ammonium.
2. A weather resistant wood grain powder coating as recited in claim 1, wherein said curing agent comprises an isocyanate curing agent and a hydroxyalkylamide curing agent in a weight ratio of (9-13): (0.8-1.2).
3. The weather-resistant wood grain wood powder coating according to claim 1, wherein the pigment and filler comprises titanium pigment and silica micropowder, and the weight ratio of the titanium pigment to the silica micropowder is (17-25): (10-18).
4. A weather resistant wood grain powder coating as recited in claim 1, wherein said cure accelerator is selected from one or both of dimethyl imidazole and 2-ethyl-4-methyl imidazole.
5. A weather resistant wood grain powder coating as recited in claim 1, wherein said ultraviolet absorber is selected from one or both of UV-531 and UV-326.
6. A method for preparing a weather-resistant wood grain powder coating, characterized by being used for preparing the weather-resistant wood grain powder coating according to any one of claims 1 to 5, comprising the following steps:
Firstly, uniformly mixing titanium dioxide-toluene diisocyanate modified polyurethane, acrylic resin, a curing agent, hydroxypropyl cellulose composite sericite powder, a curing accelerator, an ultraviolet absorber, pigment and filler and an auxiliary agent to obtain a mixed prefabricated product; and then, carrying out melt extrusion, tabletting, crushing, grinding and cyclone separation on the mixed prefabricated product at 180-220 ℃ to obtain the weather-resistant wood grain powder coating.
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| CN104263224A (en) * | 2014-10-29 | 2015-01-07 | 芜湖县双宝建材有限公司 | Cold-resistant and water-proof damping coating |
| CN104974630A (en) * | 2015-07-27 | 2015-10-14 | 华南理工大学 | High-scrubbing-resistant dry powder paint and preparation method thereof |
| JP2017128632A (en) * | 2016-01-19 | 2017-07-27 | 四国化成工業株式会社 | Resin composition and use thereof |
| CN117070135A (en) * | 2023-10-07 | 2023-11-17 | 佛山市南海嘉多彩粉末涂料有限公司 | Weather-resistant powder coating and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104263224A (en) * | 2014-10-29 | 2015-01-07 | 芜湖县双宝建材有限公司 | Cold-resistant and water-proof damping coating |
| CN104974630A (en) * | 2015-07-27 | 2015-10-14 | 华南理工大学 | High-scrubbing-resistant dry powder paint and preparation method thereof |
| JP2017128632A (en) * | 2016-01-19 | 2017-07-27 | 四国化成工業株式会社 | Resin composition and use thereof |
| CN117070135A (en) * | 2023-10-07 | 2023-11-17 | 佛山市南海嘉多彩粉末涂料有限公司 | Weather-resistant powder coating and preparation method thereof |
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