CN114015343A - High-elongation-at-break coating and preparation method and application thereof - Google Patents
High-elongation-at-break coating and preparation method and application thereof Download PDFInfo
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- CN114015343A CN114015343A CN202111547784.6A CN202111547784A CN114015343A CN 114015343 A CN114015343 A CN 114015343A CN 202111547784 A CN202111547784 A CN 202111547784A CN 114015343 A CN114015343 A CN 114015343A
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- 238000000576 coating method Methods 0.000 title claims abstract description 132
- 239000011248 coating agent Substances 0.000 title claims abstract description 129
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 73
- 229920000570 polyether Polymers 0.000 claims abstract description 73
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 66
- 229920005862 polyol Polymers 0.000 claims abstract description 53
- 150000003077 polyols Chemical class 0.000 claims abstract description 53
- 239000003054 catalyst Substances 0.000 claims abstract description 47
- 239000012948 isocyanate Substances 0.000 claims abstract description 39
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 39
- 239000004970 Chain extender Substances 0.000 claims abstract description 37
- 229920005906 polyester polyol Polymers 0.000 claims abstract description 36
- 239000002904 solvent Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 9
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 114
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 claims description 76
- 239000003963 antioxidant agent Substances 0.000 claims description 25
- 230000003078 antioxidant effect Effects 0.000 claims description 25
- 239000012752 auxiliary agent Substances 0.000 claims description 24
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 24
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 23
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 23
- 239000002518 antifoaming agent Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 14
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- 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 11
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 11
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 4
- 229910052797 bismuth Inorganic materials 0.000 claims description 4
- NSPSPMKCKIPQBH-UHFFFAOYSA-K bismuth;7,7-dimethyloctanoate Chemical compound [Bi+3].CC(C)(C)CCCCCC([O-])=O.CC(C)(C)CCCCCC([O-])=O.CC(C)(C)CCCCCC([O-])=O NSPSPMKCKIPQBH-UHFFFAOYSA-K 0.000 claims description 4
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000013557 residual solvent Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 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 2
- 239000002270 dispersing agent Substances 0.000 claims description 2
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 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 2
- 239000002994 raw material Substances 0.000 abstract description 14
- 239000011527 polyurethane coating Substances 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 3
- 239000001257 hydrogen Substances 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 239000004814 polyurethane Substances 0.000 abstract description 3
- 229920002635 polyurethane Polymers 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 30
- 230000000052 comparative effect Effects 0.000 description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
- 239000000126 substance Substances 0.000 description 19
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 16
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 15
- QUAMTGJKVDWJEQ-UHFFFAOYSA-N octabenzone Chemical group OC1=CC(OCCCCCCCC)=CC=C1C(=O)C1=CC=CC=C1 QUAMTGJKVDWJEQ-UHFFFAOYSA-N 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 10
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical group CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 7
- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 7
- 239000013530 defoamer Substances 0.000 description 7
- 239000008096 xylene Substances 0.000 description 6
- 239000003973 paint Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical group CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012974 tin catalyst Substances 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4829—Polyethers containing at least three hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6607—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Paints Or Removers (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention relates to the technical field of coatings, and particularly relates to a high-elongation-at-break coating which comprises the following components in parts by weight: 100 portions of isocyanate and 250 portions of isocyanate; 100-150 parts of hydroxyl polyether polyol; 80-120 parts of hydroxyl polyester polyol; 10-30 parts of a catalyst; 5-65 parts of a chain extender; 700 portions and 1250 portions of solvent. A preparation method of the high elongation at break coating and application of the high elongation at break coating in the top coating of the automobile coat are also designed. The coating designed by the invention has relatively dense hydrogen bonds, and a polyurethane coating formed after drying has a relatively good polyurethane network structure, so that no cross-sectional lines are generated in the installation and stretching process of the car cover, the coating has higher elongation at break, and the process of installing and attaching the car cover is more facilitated; in addition, the raw materials used by the coating are easy to obtain, the synthesis operation is simple, and the coating is suitable for industrial production and application.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a high-elongation-at-break coating and a preparation method and application thereof.
Background
In the current technical means, the common coating material TPU for the car coating film is coating resin; generally comprises the following substances: the mass ratio of the PTFE resin to the solvent to the TPU coating resin to the fluororesin to the solvent is 100-150: 5-20: 500 to 800. The problem of insufficient transverse lines can occur due to insufficient elongation at break of the coating because of the pulled edge wrapping in the installation process of the car cover.
Disclosure of Invention
The invention provides a high elongation at break coating and a preparation method and application thereof, aiming at overcoming the problem that the coating has insufficient cross-sectional lines due to insufficient elongation at break. The invention has higher elongation at break, so that no cross-sectional lines are generated in the process of installing and stretching the car clothes, and the invention is more beneficial to the process of installing and sticking the car clothes.
In order to solve the technical problems, the invention adopts the technical scheme that: the high-elongation-at-break coating comprises the following components in parts by weight:
preferably, the hydroxyl polyether polyol is at least one of trihydroxy polyether polyol with the molecular weight of 900-.
Preferably, the hydroxyl polyester polyol is at least one of trihydroxy polyester polyol with molecular weight of 900-2000 and tetrahydroxy polyester polyol with molecular weight of 8000.
Preferably, the chain extender is at least one selected from 1, 4-butanediol and 1, 6-hexanediol.
Preferably, the isocyanate is at least one selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate.
Preferably, the catalyst is a metal organic catalyst, the metal organic catalyst comprises at least one of an organic tin catalyst and an organic bismuth catalyst, the organic tin catalyst comprises dibutyltin dilaurate, and the organic bismuth catalyst comprises at least one of bismuth neodecanoate and bismuth naphthenate; the solvent is a mixture of butanone, ethyl acetate and butyl acetate.
Further, the high elongation at break coating also comprises an auxiliary agent, wherein the auxiliary agent can be at least one of an antioxidant, an anti-ultraviolet auxiliary agent, a dispersing agent and a defoaming agent, the antioxidant accounts for 5-10 parts by weight, the anti-ultraviolet auxiliary agent accounts for 5-10 parts by weight, and the defoaming agent accounts for 2-10 parts by weight.
Also provides a preparation method of the high elongation at break coating, which comprises the following steps:
s1, under the protection of protective gas, mixing isocyanate, hydroxyl polyester polyol, a catalyst, a chain extender and no more than half of solvent, and then carrying out a first reaction;
s2, adding hydroxyl polyether polyol to carry out a second reaction after the first reaction is finished;
and S3, adding the residual solvent or the residual solvent and the auxiliary agent after the second reaction is finished, and dispersing to obtain the high-elongation-at-break coating.
Preferably, the temperature of the first reaction is 60-70 ℃, and the time is 1-4 h; the temperature for adding the hydroxyl polyether polyol is 45-50 ℃; the temperature of the second reaction is 65-75 ℃, and the time is 2-3 h.
Also provides the application of the high elongation at break coating in preparing the top coating of the automobile coat.
Compared with the prior art, the beneficial effects are:
the coating designed by the invention has relatively dense hydrogen bonds, and a polyurethane coating formed after drying has a relatively good polyurethane network structure, so that no cross-sectional lines are generated in the installation and stretching process of the car cover, the coating has higher elongation at break, and the process of installing and attaching the car cover is more facilitated; in addition, the raw materials used by the coating are easy to obtain, the synthesis operation is simple, and the coating is suitable for industrial production and application.
Drawings
FIG. 1 is a strain-stress plot for example 1.
Fig. 2 is a strain-stress plot for example 2.
Fig. 3 is a strain-stress plot for example 3.
Fig. 4 is a strain-stress plot for example 4.
Fig. 5 is a strain-stress plot for example 5.
Fig. 6 is a strain-stress graph of comparative example 1.
Fig. 7 is a strain-stress graph of comparative example 2.
Fig. 8 is a strain-stress graph of comparative example 3.
Fig. 9 is a strain-stress graph of comparative example 4.
Fig. 10 is a strain-stress graph of comparative example 5.
Fig. 11 is a strain-stress graph of comparative example 6.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1
The embodiment provides a high elongation at break coating, which is prepared from the following raw materials in parts by weight: 100 parts of isocyanate, 92 parts of hydroxyl polyether polyol, 118 parts of hydroxyl polyester polyol, 10 parts of catalyst, 5 parts of chain extender, 5 parts of antioxidant, 8 parts of ultraviolet-resistant auxiliary agent, 735 parts of solvent and 5 parts of defoaming agent, wherein the isocyanate is IPDI (isophorone diisocyanate), the hydroxyl polyether polyol is trihydroxy polyether polyol with the molecular weight of 1000, and the polyether is a polyether for CASE (polyether ester for chemical engineering) from the Dow chemical company; the hydroxyl polyester polyol is trihydroxy polyester polyol, has the molecular weight of 900, and is polyether for CASE from the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; the anti-ultraviolet auxiliary agent is 2-hydroxy-4-n-octoxy benzophenone; the solvent is a mixture of butanone, ethyl acetate and butyl acetate (the weight ratio of butanone to ethyl acetate to tetrahydrofuran is 1:4: 1); the defoamer was BYK-011 from Pico.
The preparation method of the high elongation at break coating of the embodiment comprises the following steps:
(1) under the protection of nitrogen, 100 parts by weight of isocyanate, 118 parts by weight of hydroxyl polyester polyol, 10 parts by weight of catalyst, 5 parts by weight of chain extender, 100 parts by weight of butanone, 200 parts by weight of ethyl acetate and 100 parts by weight of butyl acetate are mixed and then dispersed and reacted for 3 hours at the rotating speed of 800rpm at the temperature of 70 ℃;
(2) then reducing the temperature to 45 ℃, adding 92 parts by weight of hydroxyl polyether polyol, heating to 70 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 17.5 parts by weight of butanone, 300 parts by weight of ethyl acetate and 17.5 parts by weight of butyl acetate, and dispersing at the rotating speed of 500rpm for 15 min;
(4) and adding 5 parts by weight of antioxidant, 8 parts by weight of anti-ultraviolet assistant and 5 parts by weight of defoaming agent, and dispersing at the rotating speed of 500rpm for 15min to obtain the high-elongation-at-break coating.
The high elongation at break coating of the embodiment is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible top coating of the car cover with high elongation at break is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 1.
Example 2
The embodiment provides a high elongation at break coating, which is prepared from the following raw materials in parts by weight: 125 parts of isocyanate, 92 parts of hydroxyl polyether polyol, 118 parts of hydroxyl polyester polyol, 10 parts of catalyst, 15 parts of chain extender, 5 parts of antioxidant, 8 parts of anti-ultraviolet auxiliary agent, 816 parts of solvent and 5 parts of defoaming agent, wherein the isocyanate is IPDI (isophorone diisocyanate); the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 1000, and is purchased from CASE polyether of the Dow chemical company; the hydroxyl polyester polyol is trihydroxy polyester polyol, has the molecular weight of 900, and is polyether for CASE from the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; the anti-ultraviolet auxiliary agent is 2-hydroxy-4-n-octoxy benzophenone; the solvent is a mixture of butanone, ethyl acetate and butyl acetate (the weight ratio of butanone to ethyl acetate to tetrahydrofuran is 1:4: 1); the defoamer was BYK-011 from Pico.
The preparation method of the high elongation at break coating of the embodiment comprises the following steps:
(1) under the protection of nitrogen, 125 parts by weight of isocyanate, 118 parts by weight of hydroxyl polyester polyol, 10 parts by weight of catalyst, 15 parts by weight of chain extender, 108 parts by weight of butanone, 200 parts by weight of ethyl acetate and 108 parts by weight of butyl acetate are mixed and then dispersed and reacted for 3 hours at the rotating speed of 800rpm at the temperature of 70 ℃;
(2) then reducing the temperature to 45 ℃, adding 92 parts by weight of hydroxyl polyether polyol, heating to 70 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 100 parts by weight of butanone, 200 parts by weight of ethyl acetate and 100 parts by weight of butyl acetate, and dispersing at the rotating speed of 500rpm for 15 min;
(4) and adding 5 parts by weight of antioxidant, 8 parts by weight of anti-ultraviolet assistant and 5 parts by weight of defoaming agent, and dispersing at the rotating speed of 500rpm for 15min to obtain the high-elongation-at-break coating.
The high elongation at break coating of the embodiment is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible top coating of the car cover with high elongation at break is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 2.
Example 3
The embodiment provides a high elongation at break coating, which is prepared from the following raw materials in parts by weight: 174 parts of isocyanate, 92 parts of hydroxyl polyether polyol, 118 parts of hydroxyl polyester polyol, 10 parts of catalyst, 35 parts of chain extender, 5 parts of antioxidant, 8 parts of anti-ultraviolet auxiliary agent, 980 parts of solvent and 5 parts of defoaming agent, wherein the isocyanate is IPDI (isophorone diisocyanate); the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 1000, and is purchased from CASE polyether of the Dow chemical company; the hydroxyl polyester polyol is trihydroxy polyester polyol, has the molecular weight of 900, and is polyether for CASE from the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; the anti-ultraviolet auxiliary agent is 2-hydroxy-4-n-octoxy benzophenone; the solvent is a mixture of butanone, ethyl acetate and butyl acetate (the weight ratio of butanone to ethyl acetate to tetrahydrofuran is 1:4: 1); the defoamer was BYK-011 from Pico.
The preparation method of the high elongation at break coating of the embodiment comprises the following steps:
(1) under the protection of nitrogen, 125 parts by weight of isocyanate, 118 parts by weight of hydroxyl polyester polyol, 10 parts by weight of catalyst, 15 parts by weight of chain extender, 100 parts by weight of butanone, 400 parts by weight of ethyl acetate and 100 parts by weight of butyl acetate are mixed and then dispersed and reacted for 3 hours at the rotating speed of 800rpm at the temperature of 70 ℃;
(2) then reducing the temperature to 45 ℃, adding 92 parts by weight of hydroxyl polyether polyol, heating to 70 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 80 parts by weight of butanone, 320 parts by weight of ethyl acetate and 80 parts by weight of butyl acetate, and dispersing for 15min at the rotating speed of 500 rpm;
(4) and adding 5 parts by weight of antioxidant, 8 parts by weight of anti-ultraviolet assistant and 5 parts by weight of defoaming agent, and dispersing at the rotating speed of 500rpm for 15min to obtain the high-elongation-at-break coating.
The high elongation at break coating of the embodiment is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible top coating of the car cover with high elongation at break is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 3.
Example 4
The embodiment provides a high elongation at break coating, which is prepared from the following raw materials in parts by weight: 248 parts of isocyanate, 92 parts of hydroxyl polyether polyol, 118 parts of hydroxyl polyester polyol, 10 parts of catalyst, 65 parts of chain extender, 5 parts of antioxidant, 8 parts of anti-ultraviolet auxiliary agent, 1200 parts of solvent and 5 parts of defoaming agent, wherein the isocyanate is IPDI (isophorone diisocyanate); the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 1000, and is purchased from CASE polyether of the Dow chemical company; the hydroxyl polyester polyol is trihydroxy polyester polyol, has the molecular weight of 900, and is polyether for CASE from the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; the anti-ultraviolet auxiliary agent is 2-hydroxy-4-n-octoxy benzophenone; the solvent is a mixture of butanone, ethyl acetate and butyl acetate (the weight ratio of butanone to ethyl acetate to tetrahydrofuran is 1:4: 1); the defoamer was BYK-011 from Pico.
The preparation method of the high elongation at break coating of the embodiment comprises the following steps:
(1) under the protection of nitrogen, 248 parts by weight of isocyanate, 118 parts by weight of hydroxyl polyester polyol, 10 parts by weight of catalyst, 65 parts by weight of chain extender, 150 parts by weight of butanone, 600 parts by weight of ethyl acetate and 150 parts by weight of butyl acetate are mixed and then dispersed and reacted for 3 hours at the rotating speed of 800rpm at the temperature of 70 ℃;
(2) then reducing the temperature to 45 ℃, adding 92 parts by weight of hydroxyl polyether polyol, heating to 70 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 50 parts by weight of butanone, 200 parts by weight of ethyl acetate and 50 parts by weight of butyl acetate, and dispersing at the rotating speed of 500rpm for 15 min;
(4) and adding 5 parts by weight of antioxidant, 8 parts by weight of anti-ultraviolet assistant and 5 parts by weight of defoaming agent, and dispersing at the rotating speed of 500rpm for 15min to obtain the high-elongation-at-break coating.
The high elongation at break coating of the embodiment is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible top coating of the car cover with high elongation at break is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 4.
Example 5
The embodiment provides a high elongation at break coating, which is prepared from the following raw materials in parts by weight: 76 parts of isocyanate, 92 parts of hydroxyl polyether polyol, 118 parts of hydroxyl polyester polyol, 10 parts of a catalyst, 5 parts of a chain extender, 5 parts of an antioxidant, 8 parts of an anti-ultraviolet auxiliary agent, 700 parts of a solvent and 5 parts of a defoaming agent, wherein the isocyanate is HDI (hexamethylene diisocyanate) with good resistance; the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 1000, and is purchased from CASE polyether of the Dow chemical company; the hydroxyl polyester polyol is trihydroxy polyester polyol, has the molecular weight of 900, and is polyether for CASE from the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; the anti-ultraviolet auxiliary agent is 2-hydroxy-4-n-octoxy benzophenone; the solvent is a mixture of butanone, ethyl acetate and butyl acetate (the weight ratio of butanone to ethyl acetate to tetrahydrofuran is 1:4: 1); the defoamer was BYK-011 from Pico.
The preparation method of the high elongation at break coating of the embodiment comprises the following steps:
(1) under the protection of nitrogen, 76 parts by weight of isocyanate, 118 parts by weight of hydroxyl polyester polyol, 10 parts by weight of catalyst, 5 parts by weight of chain extender, 100 parts by weight of butanone, 400 parts by weight of ethyl acetate and 100 parts by weight of butyl acetate are mixed and then dispersed and reacted for 3 hours at the rotating speed of 800rpm at the temperature of 70 ℃;
(2) then reducing the temperature to 45 ℃, adding 92 parts by weight of hydroxyl polyether polyol, heating to 70 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 50 parts by weight of butanone, 200 parts by weight of ethyl acetate and 50 parts by weight of butyl acetate, and dispersing at the rotating speed of 500rpm for 15 min;
(4) and adding 5 parts by weight of antioxidant, 8 parts by weight of anti-ultraviolet assistant and 5 parts by weight of defoaming agent, and dispersing at the rotating speed of 500rpm for 15min to obtain the high-elongation-at-break coating.
The high elongation at break coating of the embodiment is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible top coating of the car cover with high elongation at break is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 5.
Comparative example 1
The comparative example provides a coating, which is prepared from the following raw materials in parts by weight: 117 parts of isocyanate, 100 parts of hydroxyl polyether polyol, 10 parts of catalyst, 5 parts of chain extender and 260 parts of solvent, wherein the isocyanate is TDI; the hydroxyl polyether polyol is trihydroxy polyether polyol with the molecular weight of 450 and is purchased from CASE polyether of the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is BDO (1, 4-butanediol); the solvent is a mixture of xylene and cyclohexanone (weight ratio xylene: cyclohexanone 1: 1).
The preparation method of the comparative example paint comprises the following steps:
(1) under the protection of nitrogen, mixing 117 parts by weight of isocyanate, 100 parts by weight of hydroxyl polyether polyol, 65 parts by weight of xylene and 65 parts by weight of cyclohexanone, and then carrying out dispersion reaction at 75 ℃ at the rotating speed of 800rpm for 3 hours;
(2) then reducing the temperature to 50 ℃, adding 10 parts by weight of catalyst and 5 parts by weight of chain extender, heating to 75 ℃, and reacting at the constant temperature of 800rpm for 3.5 hours;
(3) reducing the temperature to 40 ℃, adding 65 parts by weight of dimethylbenzene and 65 parts by weight of cyclohexanone, and dispersing at the rotating speed of 800rpm for 5min to obtain the coating.
The comparative coating is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible car cover top coating is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 6.
Comparative example 2
The comparative example provides a coating, which is prepared from the following raw materials in parts by weight: 117 parts of isocyanate, 67 parts of hydroxyl polyether polyol, 10 parts of catalyst, 5 parts of chain extender and 260 parts of solvent, wherein the isocyanate is TDI; the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 300, and is purchased from CASE polyether of the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is BDO (1, 4-butanediol); the solvent is a mixture of xylene and cyclohexanone (weight ratio xylene: cyclohexanone 1: 1).
The preparation method of the comparative example paint comprises the following steps:
(1) under the protection of nitrogen, mixing 117 parts by weight of isocyanate, 67 parts by weight of hydroxyl polyether polyol, 65 parts by weight of xylene and 65 parts by weight of cyclohexanone, and then carrying out dispersion reaction at 75 ℃ at the rotating speed of 800rpm for 3 hours;
(2) then reducing the temperature to 50 ℃, adding 10 parts by weight of catalyst and 5 parts by weight of chain extender, heating to 75 ℃, and reacting at the constant temperature of 800rpm for 3.5 hours;
(3) reducing the temperature to 40 ℃, adding 65 parts by weight of dimethylbenzene and 65 parts by weight of cyclohexanone, and dispersing at the rotating speed of 800rpm for 5min to obtain the coating.
The comparative coating is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible car cover top coating is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 7.
Comparative example 3
The comparative example provides a coating, which is prepared from the following raw materials in parts by weight: 250 parts of isocyanate, 200 parts of hydroxyl polyether polyol, 17 parts of catalyst, 100 parts of chain extender and 600 parts of solvent, wherein the isocyanate is TDI; the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 1000, and is purchased from CASE polyether of the Dow chemical company; the catalyst is bismuth neodecanoate; the chain extender is trimethylolpropane; the solvent is a mixture of butanone, ethyl acetate and tetrahydrofuran (weight ratio of butanone: ethyl acetate: tetrahydrofuran: 1:4: 1).
The preparation method of the comparative example paint comprises the following steps:
(1) under the protection of nitrogen, 250 parts by weight of isocyanate, 17 parts by weight of catalyst, 100 parts by weight of chain extender, 40 parts by weight of butanone, 160 parts by weight of ethyl acetate and 40 parts by weight of tetrahydrofuran are mixed and then dispersed and reacted for 4 hours at the rotating speed of 800rpm at the temperature of 60 ℃;
(2) then reducing the temperature to 45 ℃, adding 200 parts by weight of hydroxyl polyether polyol, heating to 75 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 60 parts by weight of butanone, 240 parts by weight of ethyl acetate and 60 parts by weight of tetrahydrofuran into a reaction kettle, and dispersing for 15min at the rotating speed of 500rpm to obtain the coating with high elongation at break.
The comparative coating is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible car cover top coating is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 8.
Comparative example 4
The comparative example provides a coating, which is prepared from the following raw materials in parts by weight: 250 parts of isocyanate, 200 parts of hydroxyl polyether polyol, 13 parts of acrylate, 17 parts of catalyst, 100 parts of chain extender and 600 parts of solvent, wherein the isocyanate is TDI; the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 1000, and is purchased from CASE polyether of the Dow chemical company; the catalyst is bismuth neodecanoate; the chain extender is trimethylolpropane; the solvent is a mixture of butanone, ethyl acetate and tetrahydrofuran (weight ratio of butanone: ethyl acetate: tetrahydrofuran: 1:4: 1).
The preparation method of the comparative example paint comprises the following steps:
(1) under the protection of nitrogen, 250 parts by weight of isocyanate, 13 parts by weight of acrylate, 17 parts by weight of catalyst, 100 parts by weight of chain extender, 40 parts by weight of butanone, 160 parts by weight of ethyl acetate and 40 parts by weight of tetrahydrofuran are mixed and then dispersed and reacted for 4 hours at the rotating speed of 800rpm at the temperature of 60 ℃;
(2) then reducing the temperature to 45 ℃, adding 200 parts by weight of hydroxyl polyether polyol, heating to 75 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 60 parts by weight of butanone, 240 parts by weight of ethyl acetate and 60 parts by weight of tetrahydrofuran into a reaction kettle, and dispersing for 15min at the rotating speed of 500rpm to obtain the coating with high elongation at break.
The comparative coating is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible car cover top coating is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of the comparison of the elongation at break of the coating were shown in fig. 9.
Comparative example 5
The embodiment provides a high elongation at break coating, which is prepared from the following raw materials in parts by weight: 300 parts of isocyanate, 92 parts of hydroxyl polyether polyol, 118 parts of hydroxyl polyester polyol, 10 parts of catalyst, 85 parts of chain extender, 5 parts of antioxidant, 8 parts of ultraviolet-resistant auxiliary agent, 1380 parts of solvent and 5 parts of defoaming agent, wherein the isocyanate is IPDI (isophorone diisocyanate); the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 1000, and is purchased from CASE polyether of the Dow chemical company; the hydroxyl polyester polyol is trihydroxy polyester polyol, has the molecular weight of 900, and is polyether for CASE from the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; the anti-ultraviolet auxiliary agent is 2-hydroxy-4-n-octoxy benzophenone; the solvent is a mixture of butanone, ethyl acetate and butyl acetate (the weight ratio of butanone to ethyl acetate to tetrahydrofuran is 1:4: 1); the defoamer was BYK-011 from Pico.
The preparation method of the high elongation at break coating of the embodiment comprises the following steps:
(1) under the protection of nitrogen, 300 parts by weight of isocyanate, 118 parts by weight of hydroxyl polyester polyol, 10 parts by weight of catalyst, 85 parts by weight of chain extender, 150 parts by weight of butanone, 600 parts by weight of ethyl acetate and 150 parts by weight of butyl acetate are mixed and then dispersed and reacted for 3 hours at the rotating speed of 800rpm at the temperature of 70 ℃;
(2) then reducing the temperature to 45 ℃, adding 92 parts by weight of hydroxyl polyether polyol, heating to 70 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 80 parts by weight of butanone, 320 parts by weight of ethyl acetate and 80 parts by weight of butyl acetate, and dispersing for 15min at the rotating speed of 500 rpm;
(4) and adding 5 parts by weight of antioxidant, 8 parts by weight of anti-ultraviolet assistant and 5 parts by weight of defoaming agent, and dispersing at the rotating speed of 500rpm for 15min to obtain the high-elongation-at-break coating.
The high elongation at break coating of the embodiment is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible top coating of the car cover with high elongation at break is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of comparison of the elongation at break of the coating were shown in fig. 10.
Comparative example 6
The embodiment provides a high elongation at break coating, which is prepared from the following raw materials in parts by weight: 87.5 parts of isocyanate, 92 parts of hydroxyl polyether polyol, 118 parts of hydroxyl polyester polyol, 10 parts of a catalyst, 85 parts of a chain extender, 5 parts of an antioxidant, 8 parts of an anti-ultraviolet auxiliary agent, 640 parts of a solvent and 5 parts of a defoaming agent, wherein the isocyanate is IPDI (isophorone diisocyanate); the hydroxyl polyether polyol is trihydroxy polyether polyol, has the molecular weight of 1000, and is purchased from CASE polyether of the Dow chemical company; the hydroxyl polyester polyol is trihydroxy polyester polyol, has the molecular weight of 900, and is polyether for CASE from the Dow chemical company; the catalyst is dibutyltin dilaurate; the chain extender is 1, 4-butanediol; the antioxidant is 2, 6-di-tert-butyl-4-methylphenol; the anti-ultraviolet auxiliary agent is 2-hydroxy-4-n-octoxy benzophenone; the solvent is a mixture of butanone, ethyl acetate and butyl acetate (the weight ratio of butanone to ethyl acetate to tetrahydrofuran is 1:4: 1); the defoamer was BYK-011 from Pico.
The preparation method of the high elongation at break coating of the embodiment comprises the following steps:
(1) under the protection of nitrogen, 300 parts by weight of isocyanate, 118 parts by weight of hydroxyl polyester polyol, 10 parts by weight of catalyst, 70 parts by weight of butanone, 280 parts by weight of ethyl acetate and 70 parts by weight of butyl acetate are mixed and then dispersed and reacted for 3 hours at the rotating speed of 800rpm at 70 ℃;
(2) then reducing the temperature to 45 ℃, adding 92 parts by weight of hydroxyl polyether polyol, heating to 70 ℃, and reacting at the constant temperature of 800rpm for 2 hours;
(3) reducing the temperature to 45 ℃, adding 20 parts by weight of butanone, 80 parts by weight of ethyl acetate and 20 parts by weight of butyl acetate, and dispersing at the rotating speed of 500rpm for 15 min;
(4) and adding 5 parts by weight of antioxidant, 8 parts by weight of anti-ultraviolet assistant and 5 parts by weight of defoaming agent, and dispersing at the rotating speed of 500rpm for 15min to obtain the high-elongation-at-break coating.
The high elongation at break coating of the embodiment is coated on a TPU base film through a coating machine, baked for 3 minutes at 100 ℃, and cured to form a film, so that the invisible top coating of the car cover with high elongation at break is formed.
The car clothes were tested by a universal tensile machine, the tensile properties of the car clothes were tested, the elongation at break of the coating was tested, and the results of comparison of the elongation at break of the coating were shown in fig. 11.
As can be seen from the data in the following table 1 and the comparison results in FIGS. 1 to 11, the test results of the comparison experiments all have coating fracture peaks, and the existing coatings on the market all have transverse striations at 100%, so that more problems occur in processing; while examples 1-5, by designing the novel formulation and content according to the present invention, no striations occurred, and a polyurethane coating with no cross-sectional striations was obtained. The coating designed by the invention has relatively dense hydrogen bonds, and a polyurethane coating formed after drying has a relatively good polyurethane network structure, so that no cross-sectional lines are generated in the installation and stretching process of the car cover, the coating has higher elongation at break, and the process of installing and attaching the car cover is more facilitated; in addition, the raw materials used by the coating are easy to obtain, the synthesis operation is simple, and the coating is suitable for industrial production and application.
TABLE 1
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The high-elongation-at-break coating is characterized by comprising the following components in parts by weight:
2. the high elongation at break coating of claim 1, wherein the hydroxyl polyether polyol is at least one of trihydroxy polyether polyol having a molecular weight of 900-.
3. The high elongation at break coating of claim 1, wherein the hydroxyl polyester polyol is at least one of trihydroxy polyester polyol molecular weight 900-.
4. The high elongation at break coating of claim 1, wherein the chain extender is selected from at least one of 1, 4-butanediol, 1, 6-hexanediol.
5. The high elongation at break coating of claim 1, wherein the isocyanate is selected from at least one of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate.
6. The high elongation at break coating of any one of claims 1 to 5, wherein the catalyst is a metal organic catalyst comprising at least one of an organotin catalyst, an organobismuth catalyst, the organotin catalyst comprising dibutyltin dilaurate, and the organobismuth catalyst comprising at least one of bismuth neodecanoate, bismuth naphthenate; the solvent is a mixture of butanone, ethyl acetate and butyl acetate.
7. The high elongation at break coating according to any one of claims 1 to 5, wherein the components of the high elongation at break coating further comprise an auxiliary agent, the auxiliary agent can be at least one of an antioxidant, an anti-ultraviolet auxiliary agent, a dispersing agent and an antifoaming agent, the antioxidant is 5 to 10 parts by weight, the anti-ultraviolet auxiliary agent is 5 to 10 parts by weight, and the antifoaming agent is 2 to 10 parts by weight.
8. A method for preparing the high elongation at break coating material according to any one of claims 1 to 7, comprising the steps of:
s1, under the protection of protective gas, mixing isocyanate, hydroxyl polyester polyol, a catalyst, a chain extender and no more than half of solvent, and then carrying out a first reaction;
s2, adding hydroxyl polyether polyol to carry out a second reaction after the first reaction is finished;
and S3, adding the residual solvent or the residual solvent and the auxiliary agent after the second reaction is finished, and dispersing to obtain the high-elongation-at-break coating.
9. The preparation method according to claim 8, wherein the temperature of the first reaction is 60-70 ℃ and the time is 1-4 h; the temperature for adding the hydroxyl polyether polyol is 45-50 ℃; the temperature of the second reaction is 65-75 ℃, and the time is 2-3 h.
10. Use of a high elongation at break coating according to any one of claims 1 to 7 for the preparation of a top coating for a vehicle cover.
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| CN114752293A (en) * | 2022-03-11 | 2022-07-15 | 中国科学院宁波材料技术与工程研究所 | Coating material for automobile coating film and preparation method thereof |
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| CN111690364A (en) * | 2020-07-22 | 2020-09-22 | 佛山市同骏环保科技有限公司 | Single-component high-temperature curing adhesive |
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| CN111690364A (en) * | 2020-07-22 | 2020-09-22 | 佛山市同骏环保科技有限公司 | Single-component high-temperature curing adhesive |
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| CN114752293A (en) * | 2022-03-11 | 2022-07-15 | 中国科学院宁波材料技术与工程研究所 | Coating material for automobile coating film and preparation method thereof |
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