CN113755087A - High-toughness elastic two-component polyurethane coating and application thereof - Google Patents
High-toughness elastic two-component polyurethane coating and application thereof Download PDFInfo
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- CN113755087A CN113755087A CN202111067087.0A CN202111067087A CN113755087A CN 113755087 A CN113755087 A CN 113755087A CN 202111067087 A CN202111067087 A CN 202111067087A CN 113755087 A CN113755087 A CN 113755087A
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- paint
- component polyurethane
- polyurethane coating
- pigment
- acrylic resin
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- 239000011527 polyurethane coating Substances 0.000 title claims abstract description 31
- 239000003973 paint Substances 0.000 claims abstract description 85
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 50
- 229920001971 elastomer Polymers 0.000 claims abstract description 45
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 43
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 43
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 43
- 239000000049 pigment Substances 0.000 claims abstract description 21
- 239000003960 organic solvent Substances 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 18
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 12
- 239000006254 rheological additive Substances 0.000 claims abstract description 12
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical class CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920000728 polyester Polymers 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 19
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 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 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 6
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 6
- 229910021485 fumed silica Inorganic materials 0.000 claims description 6
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 6
- 239000006229 carbon black Substances 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000007766 curtain coating Methods 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- SVONRAPFKPVNKG-UHFFFAOYSA-N 2-ethoxyethyl acetate Chemical compound CCOCCOC(C)=O SVONRAPFKPVNKG-UHFFFAOYSA-N 0.000 claims description 3
- CGLVZFOCZLHKOH-UHFFFAOYSA-N 8,18-dichloro-5,15-diethyl-5,15-dihydrodiindolo(3,2-b:3',2'-m)triphenodioxazine Chemical compound CCN1C2=CC=CC=C2C2=C1C=C1OC3=C(Cl)C4=NC(C=C5C6=CC=CC=C6N(C5=C5)CC)=C5OC4=C(Cl)C3=NC1=C2 CGLVZFOCZLHKOH-UHFFFAOYSA-N 0.000 claims description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052797 bismuth Inorganic materials 0.000 claims description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 3
- 239000001055 blue pigment Substances 0.000 claims description 3
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 claims description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 239000001053 orange pigment Substances 0.000 claims description 3
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 claims description 3
- 239000001054 red pigment Substances 0.000 claims description 3
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- 239000001052 yellow pigment Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims 3
- NDDLLTAIKYHPOD-ISLYRVAYSA-N (2e)-6-chloro-2-(6-chloro-4-methyl-3-oxo-1-benzothiophen-2-ylidene)-4-methyl-1-benzothiophen-3-one Chemical compound S/1C2=CC(Cl)=CC(C)=C2C(=O)C\1=C1/SC(C=C(Cl)C=C2C)=C2C1=O NDDLLTAIKYHPOD-ISLYRVAYSA-N 0.000 claims 1
- 239000004927 clay Substances 0.000 claims 1
- 239000004408 titanium dioxide Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 45
- 239000011248 coating agent Substances 0.000 description 43
- 239000000758 substrate Substances 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 10
- 239000011159 matrix material Substances 0.000 description 9
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 7
- 238000001035 drying Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 244000043261 Hevea brasiliensis Species 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 6
- 229920003052 natural elastomer Polymers 0.000 description 6
- 229920001194 natural rubber Polymers 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 239000003086 colorant Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 244000144730 Amygdalus persica Species 0.000 description 2
- 229920000805 Polyaspartic acid Polymers 0.000 description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000001514 detection method Methods 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
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 108010064470 polyaspartate Proteins 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical class O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000012974 tin catalyst Substances 0.000 description 1
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
- C08G18/40—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
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
-
- 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
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
- C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
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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)
Abstract
The invention provides a high-toughness elastic two-component polyurethane coating and application thereof, belonging to the field of coatings for rubber. The high-toughness elastic two-component polyurethane coating provided by the invention comprises independently subpackaged paint and a curing agent; the paint comprises the following components in percentage by mass: 40-70% of rigid hydroxyl acrylic resin, 2-8% of flexible hydroxyl acrylic resin, 16-35% of pigment and filler, 10-20% of organic solvent, 0.5-3% of dispersing agent, 0.5-1% of rheological additive, 0.2-1% of organic tin drier, 0.2-0.7% of flatting agent and 0.1-0.5% of defoaming agent; the curing agent comprises flexible polyester modified isophorone diisocyanate; the mass ratio of the paint to the curing agent is (1-1.5): 1. the high-toughness elastic two-component polyurethane coating provided by the invention has high elasticity, high toughness and good weather resistance.
Description
Technical Field
The invention relates to the field of coatings for rubber, in particular to a high-toughness elastic two-component polyurethane coating and application thereof.
Background
Rubber materials are known as one of four major polymer materials, and the use amount is always in short supply. The consumption of natural rubber is the largest in all rubber materials, and almost accounts for more than 80% of the consumption of all rubber, so that the natural rubber trees are increasingly planted in tropical regions such as Hainan, Vietnam, Thailand, southeast Asia and the like in China in recent years. Natural rubber is vulcanized by sulfur and then reinforced by a large amount of carbon black (accounting for about 20 percent of the mass fraction of the rubber) to obtain a high-elasticity and high-toughness polymer material which has high damping property and is widely applied to a buffering packaging material, and a better and more economic material is not used for replacing the material at present.
Since rubber must be reinforced with carbon black, most rubber materials are black, which results in the inability to make other rubber materials of various colors. Therefore, it is necessary to coat the surface of the rubber material with a paint to change the color of the black rubber. However, the rubber material itself has high elasticity, so that the general coating material cannot be adhered thereto, because the general coating material cannot achieve the rubber material having elongation higher than 300% and cracks. Therefore, in order to adhere the coating on the rubber, the coating must have the same high elasticity after being cured, and simultaneously have high toughness, so that the coating cannot crack along with the stretching of the rubber, and can also return to the original state along with the rubber.
At present, Chinese patent application CN201510945984.5 discloses a high-elongation rubber coating and a preparation method thereof, the coating protected by the patent is also a two-component coating, but the film is formed by a two-component cross-linked network formed by polyaspartic acid resin, chlorinated rubber resin and polyether modified hexamethylene diisocyanate. Although the paint has good performance, the reaction speed is fast and uncontrollable because the reaction of the polyaspartic acid resin and isocyanate is the reaction of amino and-NCO group, thereby causing the paint to have too short brushing period and limiting the use of the paint; in addition, the chlorinated rubber used in the coating has poor weather resistance and is not suitable for the aging-resistant protection of rubber materials.
Therefore, it is highly desirable to provide a coating material with high elasticity, high toughness and good weather resistance, so that the coating material can better meet the use requirements of rubber materials.
Disclosure of Invention
The invention aims to provide a high-toughness elastic two-component polyurethane coating and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a high-toughness elastic double-component polyurethane coating, which comprises independently subpackaged paint and a curing agent;
the paint comprises the following components in percentage by mass: 40-70% of rigid hydroxyl acrylic resin, 2-8% of flexible hydroxyl acrylic resin, 16-35% of pigment and filler, 10-20% of organic solvent, 0.5-3% of dispersing agent, 0.5-1% of rheological additive, 0.2-1% of organic tin drier, 0.2-0.7% of flatting agent and 0.1-0.5% of defoaming agent;
the curing agent comprises flexible polyester modified isophorone diisocyanate;
the mass ratio of the paint to the curing agent is (1-1.5): 1.
preferably, the solid content of the rigid hydroxy acrylic resin is 63-66%.
Preferably, the solid content of the flexible hydroxy acrylic resin is 58-62%.
Preferably, the pigment and filler is one or more of rutile titanium dioxide, environment-friendly organic medium yellow pigment, environment-friendly organic orange pigment, environment-friendly organic red pigment, permanent violet pigment, carbon black, permanent peach red, bismuth vanadate yellow, iron oxide red, iron oxide black, iron oxide yellow, phthalocyanine blue pigment, phthalocyanine green, mica powder, talcum powder, silicon micropowder and precipitated barium sulfate.
Preferably, the organic solvent is at least two of xylene, butyl acetate, propylene glycol methyl ether acetate and ethylene glycol ethyl ether acetate.
Preferably, the rheological aid is one or two of fumed silica and organically modified bentonite.
Preferably, the organotin driers include dibutyltin dilaurate and butyl acetate.
Preferably, the mass concentration of the dibutyltin dilaurate in the organic tin drier is 0.8-1.2%.
The invention also provides the application of the high-toughness elastic two-component polyurethane coating in the rubber material.
Preferably, after the paint and the curing agent are mixed, the organic solvent is added to adjust the viscosity to 25-40S for curtain coating.
The invention provides a high-toughness elastic double-component polyurethane coating, which comprises independently subpackaged paint and a curing agent; the paint comprises the following components in percentage by mass: 40-70% of rigid hydroxyl acrylic resin, 2-8% of flexible hydroxyl acrylic resin, 16-35% of pigment and filler, 10-20% of organic solvent, 0.5-3% of dispersing agent, 0.5-1% of rheological additive, 0.2-1% of organic tin drier, 0.2-0.7% of flatting agent and 0.1-0.5% of defoaming agent; the curing agent comprises flexible polyester modified isophorone diisocyanate; the mass ratio of the paint to the curing agent is (1-1.5): 1. according to the invention, two different hydroxyl acrylic resins are used as adhesive resin components of the coating, so that the coating has good toughness and elasticity by synergistically utilizing respective rigidity and flexibility characteristics, and the hydroxyl is a polar group, which is beneficial to improving the adhesive force of the coating on the surface of a rubber matrix; in addition, the pigment, the filler and other auxiliary components are added, so that the paint can have various colors, and the dispersibility of the components, the stability and the rheological property of a system are further improved, so that the toughness and the elasticity of the paint are improved; in addition, the flexible polyester modified isophorone diisocyanate is selected as the curing agent of the hydroxyl acrylic resin, and the cross-linking density of the coating can be effectively improved by regulating and controlling the use ratio of the curing agent to the paint, so that the toughness and elasticity of the coating are further improved.
The results of the examples show that the high-toughness elastic two-component polyurethane coating provided by the invention is foamless, flat and good in leveling property; when a drying experiment is carried out according to the GB/T2707 standard, the surface drying time (23 ℃, 50% RH) of the film layer can be reduced to 18-23 min, and the actual drying time (23 ℃, 50% RH) can be reduced to 6-9 h; the high-toughness elastic two-component polyurethane coating prepared by the embodiment is more than 8 hours; an adhesive force lattice dividing method is 0 grade when the adhesive force detection is carried out on the coating film layer on the surface of the rubber substrate according to the GB/T9286 standard; when the damp-heat resistant experiment (720h) is carried out according to the GB/T1740 standard, the film layer is unchanged; the film layer can resist boiling for 1 hour, the film layer is not changed after boiling, and a water resistance experiment (7d) is carried out according to the GB/T1733 standard, so that the film layer is not changed; when an acid resistance (7d, 5 percent sulfuric acid) experiment is carried out according to the GB/T1734 standard, a paint film is unchanged; when an alkali resistance (7d, 5% NaOH) experiment is carried out according to the GB9274 standard, a paint film is unchanged; the weather resistance is carried out for 1000h according to the GB/T1865 standard, and the weather resistance of a film layer on the surface of a rubber substrate can reach 0 level; the film layer is not changed after being wiped for 50 times by butanone; the elongation at break of the paint film on the surface of the rubber substrate can reach 350-420% by detecting the elongation at break according to JIS 6251-2018 standard, and the film layer can still recover the original appearance after the rubber substrate is stretched by 300%.
Detailed Description
The invention provides a high-toughness elastic double-component polyurethane coating, which comprises independently subpackaged paint and a curing agent;
the paint comprises the following components in percentage by mass: 40-70% of rigid hydroxyl acrylic resin, 2-8% of flexible hydroxyl acrylic resin, 16-35% of pigment and filler, 10-20% of organic solvent, 0.5-3% of dispersing agent, 0.5-1% of rheological additive, 0.2-1% of organic tin drier, 0.2-0.7% of flatting agent and 0.1-0.5% of defoaming agent;
the curing agent comprises flexible polyester modified isophorone diisocyanate;
the mass ratio of the paint to the curing agent is (1-1.5): 1.
the high-toughness elastic two-component polyurethane coating provided by the invention comprises independently subpackaged paint and a curing agent. According to the invention, the paint vehicle and the curing agent are independently packaged, so that the epoxy primer can be prevented from being crosslinked and cured during storage, and meanwhile, the independently packaged two-component paint can be mixed and crosslinked during use, so that a paint film with good toughness and weather resistance of the veneer can be obtained.
The paint comprises 40-70% of rigid hydroxyl acrylic resin, preferably 45-65%, more preferably 50-60%, and most preferably 55% by mass. According to the invention, the rigid hydroxyl acrylic resin is adopted, and the content of the rigid hydroxyl acrylic resin is controlled within the range, so that a paint film with good elastic toughness and weather resistance can be obtained.
In the invention, the solid content of the rigid hydroxy acrylic resin is preferably 63-66%, and more preferably 64-65%. According to the invention, by controlling the solid content of the rigid hydroxy acrylic resin within the range, the rigid hydroxy acrylic resin has proper viscosity and fluidity when being mixed with other components, and is more beneficial to improving the mixing uniformity of the resin component and other components.
In the present invention, the solid hydroxyl group content of the rigid hydroxyacrylic resin is preferably 2 to 3%, and more preferably 2.7%. The solid hydroxyl content of the rigid hydroxyl acrylic resin is controlled within the range, so that the rigid hydroxyl acrylic resin has a proper amount of polar hydroxyl groups, and the adhesive force of the coating on the surface of a rubber substrate is improved.
The paint comprises 2-8% of flexible hydroxyl acrylic resin, preferably 3-7%, more preferably 4-6%, and more preferably 5% by mass. According to the invention, the flexible hydroxy acrylic resin is adopted, and the content of the flexible hydroxy acrylic resin is controlled within the range, so that the flexible hydroxy acrylic resin and the rigid hydroxy acrylic resin can act synergistically, and the elastic toughness and the weather resistance of a paint film are effectively improved.
In the invention, the solid content of the flexible hydroxy acrylic resin is preferably 58-62%, and more preferably 59-60%. According to the invention, by controlling the solid content of the flexible hydroxy acrylic resin within the range, the flexible hydroxy acrylic resin has proper viscosity and fluidity when other components are mixed, and is more beneficial to improving the mixing uniformity of the resin component and other components.
In the invention, the hydroxyl content of the flexible hydroxyl acrylic resin in solid parts is preferably 3-4%, and more preferably 3.6%. The invention can effectively improve the adhesive force of the coating on the surface of the rubber substrate by controlling the hydroxyl content of the solid part of the flexible hydroxyl acrylic resin within the range and the combined action of the hydroxyl in the rigid hydroxyl acrylic resin.
The paint comprises 16-35% of pigment and filler, preferably 18-30%, more preferably 20-28%, and more preferably 22-25% by weight. According to the invention, the pigment and the filler are added, and the content of the pigment and the filler is controlled within the range, so that the coating has richer colors, and the weather resistance and the corrosion resistance of the coating are effectively improved.
In the invention, the pigment and filler is preferably one or more of rutile titanium dioxide, environment-friendly organic medium yellow pigment, environment-friendly organic orange pigment, environment-friendly organic red pigment, permanent violet pigment, carbon black, permanent peach red, bismuth vanadate yellow, iron oxide red, iron oxide black, iron oxide yellow, phthalocyanine blue pigment, phthalocyanine green, mica powder, talcum powder, silicon micropowder and precipitated barium sulfate. The color of the rubber matrix is better covered by the selected pigment and filler, and the pigment and filler has strong corrosion resistance and can improve the protection effect on the rubber matrix.
The paint comprises 10-20% of organic solvent, preferably 12-18%, more preferably 14-16%, and more preferably 15% by mass. According to the invention, the organic solvent is added, and the content of the organic solvent is controlled within the range, so that the viscosity and the fluidity of the coating can be adjusted, and the components in the coating can be more uniformly dispersed.
In the present invention, the organic solvent is preferably at least two of xylene, butyl acetate, propylene glycol methyl ether acetate and ethylene glycol ethyl ether acetate. The organic solvent is selected to be more beneficial to improving the solubility of the organic solvent to resin components, so that the dispersion uniformity of a coating system is improved, and the organic solvent is ensured not to volatilize to cause paint film cracking and wrinkling when the coating is cured.
The paint comprises 0.5-3% of dispersing agent, preferably 0.8-2.8%, more preferably 1-2.5%, and more preferably 1.5-2% by mass. According to the invention, the dispersing agent is added, and the content of the dispersing agent is controlled within the range, so that the dispersion uniformity of each component in the coating can be effectively improved, and the stability of the coating is improved.
In the present invention, the dispersant is preferably an acrylate copolymer, more preferably one of BYK-110, BYK-111, BYK-160, BYK-161, BYK-170, BYK-171, manufactured by BYK, Germany, or EFKA-4010, EFKA-4050, EFKA-4401, and EFKA-4300, manufactured by BASF, Germany.
The paint comprises 0.5-1% of rheological additive, preferably 0.6-0.9%, more preferably 0.7-0.8%, and more preferably 0.75% by mass. According to the invention, the rheological additive is added, and the content of the rheological additive is controlled within the range, so that the rheological property of the coating during coating can be effectively improved, the flatness of a paint film is improved, the porosity is reduced, and the weather resistance and the elastic toughness of the paint film are improved.
In the present invention, the rheological aid preferably includes fumed silica and organically modified bentonite. By selecting the rheological additive, the invention can utilize the good adsorbability and high dispersibility of the fumed silica and the organic modified bentonite, can improve the rheological property and thixotropy of a coating system, has a reinforcing effect on the coating, and effectively improves the adhesive force and the elastic toughness of a paint film on a rubber matrix.
In the invention, the mass ratio of the fumed silica to the organic modified bentonite is preferably (1-5): (4-8), more preferably (2-4): (5-7). According to the invention, the mass ratio of the fumed silica to the organic modified bentonite is controlled within the range, so that the rheological property and thixotropy of a coating system are improved, and the adhesive force and elastic toughness of a paint film on a rubber matrix are improved.
The paint comprises 0.2-1% of organic tin drier, preferably 0.3-0.9%, more preferably 0.4-0.8%, and more preferably 0.5-0.6% by mass. According to the invention, the organic tin drier is added, and the content of the organic tin drier is controlled within the range, so that the volatilization of an organic solvent can be effectively accelerated, the curing and drying speed of a paint film is improved, and the influence on the curing quality of the paint film caused by long-time contact of air and water vapor after the paint is coated is avoided, thereby being more beneficial to improving the weather resistance and the elastic toughness of the paint.
In the present invention, the organotin driers preferably include dibutyltin dilaurate and butyl acetate. In the invention, the mass concentration of the dibutyltin dilaurate in the organotin drier is preferably 0.8-1.2%, more preferably 0.9-1.1%, and most preferably 1%. The invention is more beneficial to accelerating the volatilization of the organic solvent and improving the crosslinking speed of the resin component of the coating by selecting the organic tin catalyst and controlling the component proportion in the range, and is more beneficial to improving the weather resistance and the elastic toughness of the coating.
The paint comprises 0.2-0.7% of leveling agent, preferably 0.3-0.6%, more preferably 0.4-0.5%, and more preferably 0.45% by mass. According to the invention, the leveling agent is added, and the content of the leveling agent is controlled within the range, so that the flatness of the coating after coating is improved, and the coating has better coating performance.
In the present invention, the leveling agent is preferably one of AFCONA-3700, AFCONA-3772 and AFCONA-3777 manufactured by AFCONA of the Netherlands.
The paint comprises 0.1-0.5% of defoaming agent, preferably 0.2-0.45%, more preferably 0.25-0.4%, and more preferably 0.3-0.35% by mass. According to the invention, the defoaming agent is added, and the content of the defoaming agent is controlled within the range, so that the problem of air bubbles in the coating can be effectively avoided, and the cured paint film is more compact, and the weatherability and the elastic toughness of the coating can be improved.
In the invention, the defoaming agent is preferably an organic silicon foam breaking polymer solution, and more preferably is BYK-060, BYK-065, BYK-066N, BYK-067A, BYK-070 and BYK-071 produced by Germany Bick company or one of EFKA-2022, EFKA-2722, EFKA-2048, EFKA-S048, EFKA-2035, EFKA-2028 and EFKA-2025 produced by Germany BASF company.
In the present invention, the preparation method of the paint preferably includes the steps of:
(1) mixing rigid hydroxyl acrylic resin, flexible hydroxyl acrylic resin, a dispersing agent, a rheological additive, pigment and filler, a defoaming agent, a leveling agent and an organic tin drier to obtain a premixed paint vehicle;
(2) and (3) sanding the premixed paint obtained in the step (1) to obtain the paint.
According to the invention, rigid hydroxyl acrylic resin, flexible hydroxyl acrylic resin, a dispersing agent, a rheological additive, a pigment and filler, a defoaming agent, a leveling agent and an organic tin drier are preferably mixed to obtain the premixed paint.
In the present invention, the mixing is preferably performed by stirring; the stirring speed is preferably 1000-2000 rpm, and more preferably 1200-1800 rpm; the stirring time is preferably 15-30 min.
After the ready-mix paint is obtained, the ready-mix paint is preferably sanded to obtain the paint in the present invention. The invention can further refine the granularity of the pigment and filler components in the coating by sanding, so that the components of the coating system are mixed more uniformly and have higher dispersity.
In the present invention, the paint particle size after sanding is preferably 15 μm or less, more preferably 10 μm or less. According to the invention, by controlling the granularity of the paint after sanding within the range, the paint can be ensured to have higher stability, and the paint film is more compact after curing, so that the paint has higher adhesive force, higher elastic toughness and weather resistance on the surface of a substrate.
The sanding operation is not particularly limited in the present invention, and the desired particle size of the paint can be achieved by sanding methods known to those skilled in the art.
In the present invention, the curing agent comprises a flexible polyester-modified isophorone diisocyanate. According to the invention, the flexible polyester modified isophorone diisocyanate is selected as the curing agent of the hydroxyl acrylic resin, so that the crosslinking density of the hydroxyl acrylic resin is improved, and the coating has higher elastic toughness and weather resistance after being cured.
In the invention, the mass ratio of the paint to the curing agent is (1-1.5): 1, preferably (1.1 to 1.4): 1, more preferably (1.2 to 1.3): 1. according to the invention, the mass ratio of the paint and the curing agent is controlled within the range, so that the crosslinking speed can be better regulated and controlled, and the crosslinking density can be effectively improved, thereby further improving the elastic toughness and the weather resistance of the paint.
The preparation method of the curing agent is not specially limited, and all the components are uniformly mixed.
The invention also provides the application of the high-toughness elastic two-component polyurethane coating in the rubber material.
In the present invention, the application preferably includes: and mixing the paint and the curing agent, and then adding an organic solvent to adjust the viscosity to 25-40S for curtain coating.
The application of the high-toughness elastic two-component polyurethane coating in rubber materials provided by the invention can enable a rubber matrix to have richer colors, and enable the rubber matrix in various shapes to be successfully coated with a flat, uniform and pore-free paint film through curtain coating, so that the rubber matrix can be better protected, and the paint film has high elasticity, toughness and weather resistance, can be randomly deformed along with the rubber matrix without being damaged, and has better application prospects.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The high-toughness elastic two-component polyurethane coating disclosed by the embodiments 1-4 of the invention is composed of independently packaged paint and a curing agent, and the components and the proportion of the paint and the curing agent are shown in table 1.
The preparation method of the paint in the high-toughness elastic two-component polyurethane coating disclosed by the embodiment 1-4 of the invention comprises the following steps:
(1) mixing rigid hydroxyl acrylic resin, flexible hydroxyl acrylic resin, a dispersing agent, a rheological additive, pigment and filler, a defoaming agent, a leveling agent and an organic tin drier to obtain a premixed paint vehicle; wherein the mixing mode is stirring, the stirring speed is 1500rpm, and the stirring time is 30 min;
(2) and (2) sanding the premixed paint obtained in the step (1) until the granularity of the paint is less than or equal to 15 mu m to obtain the paint.
The high-toughness elastic two-component polyurethane coating disclosed by the embodiments 1-4 is applied to a rubber packaging container, all the rubber packaging containers used in the embodiments 1-4 are vulcanized natural rubber, the paint and the curing agent in the embodiments 1-4 are uniformly mixed according to the mass ratio of 1.3:1, an organic solvent is added to adjust the viscosity to S, the vulcanized natural rubber is respectively coated by spraying, after the spraying is finished, the mixture is placed in a constant-temperature constant-humidity chamber (23 ℃ and 50%) to be dried, corresponding adjusting time is selected according to the technical indexes shown in the table 2, and the measured technical indexes are shown in the table 2.
Table 1 compositions of independently packed paint and curing agent in the high toughness elastic two-component polyurethane coating of examples 1 to 4 of the present invention and their ratios
Table 2 test results of paint film performance of spray coating and curing on surface of vulcanized natural rubber in embodiments 1 to 4 of the present invention
As can be seen from Table 2, the high-toughness elastic two-component polyurethane coating provided by the invention is foamless, flat and good in leveling property; when a drying experiment is carried out according to the GB/T2707 standard, the surface drying time (23 ℃, 50% RH) of the film layer can be reduced to 18-23 min, and the actual drying time (23 ℃, 50% RH) can be reduced to 6-9 h; the high-toughness elastic two-component polyurethane coating prepared by the embodiment is more than 8 hours; an adhesive force lattice dividing method is 0 grade when the adhesive force detection is carried out on the coating film layer on the surface of the rubber substrate according to the GB/T9286 standard; when the damp-heat resistant experiment (720h) is carried out according to the GB/T1740 standard, the film layer is unchanged; the film layer can resist boiling for 1 hour, the film layer is not changed after boiling, and a water resistance experiment (7d) is carried out according to the GB/T1733 standard, so that the film layer is not changed; when an acid resistance (7d, 5 percent sulfuric acid) experiment is carried out according to the GB/T1734 standard, a paint film is unchanged; when an alkali resistance (7d, 5% NaOH) experiment is carried out according to the GB9274 standard, a paint film is unchanged; the weather resistance is carried out for 1000h according to the GB/T1865 standard, and the weather resistance of a film layer on the surface of a rubber substrate can reach 0 level; the film layer is not changed after being wiped for 50 times by butanone; the elongation at break of the paint film on the surface of the rubber substrate can reach 350-420% by detecting the elongation at break according to JIS 6251-2018 standard, and the film layer can still recover the original appearance after the rubber substrate is stretched by 300%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A high-toughness elastic double-component polyurethane coating comprises independently subpackaged paint and a curing agent;
the paint comprises the following components in percentage by mass: 40-70% of rigid hydroxyl acrylic resin, 2-8% of flexible hydroxyl acrylic resin, 16-35% of pigment and filler, 10-20% of organic solvent, 0.5-3% of dispersing agent, 0.5-1% of rheological additive, 0.2-1% of organic tin drier, 0.2-0.7% of flatting agent and 0.1-0.5% of defoaming agent;
the curing agent comprises flexible polyester modified isophorone diisocyanate;
the mass ratio of the paint to the curing agent is (1-1.5): 1.
2. a high toughness and elastic two-component polyurethane coating according to claim 1, wherein said rigid hydroxy acrylic resin has a solid content of 63 to 66%.
3. A high toughness two-component polyurethane coating according to claim 1, wherein said flexible hydroxy acrylic resin has a solid content of 58-62%.
4. A high toughness and elasticity two-component polyurethane coating according to claim 1, wherein said pigment and filler is one or more of rutile type titanium dioxide, environmental protection organic medium yellow pigment, environmental protection organic orange pigment, environmental protection organic red pigment, permanent violet pigment, carbon black, permanent pink, bismuth vanadate yellow, iron oxide red, iron oxide black, iron oxide yellow, phthalocyanine blue pigment, phthalocyanine green, mica powder, talcum powder, silicon micropowder and precipitated barium sulfate.
5. A high toughness elastic two-component polyurethane coating according to claim 1, wherein said organic solvent is at least two of xylene, butyl acetate, propylene glycol methyl ether acetate and ethylene glycol ethyl ether acetate.
6. A high toughness elastomeric two component polyurethane coating according to claim 1 wherein said rheological aid comprises fumed silica and organically modified bentonite clay.
7. A high toughness elastomeric two component polyurethane coating as claimed in claim 1 wherein said organotin driers include dibutyltin dilaurate and butyl acetate.
8. A high toughness elastic two-component polyurethane coating according to claim 7, wherein the mass concentration of dibutyltin dilaurate in the organotin drier is 0.8-1.2%.
9. Use of a high toughness elastomeric two component polyurethane coating according to any one of claims 1 to 8 in rubber materials.
10. The application of claim 9, wherein after the paint and the curing agent are mixed, an organic solvent is added to adjust the viscosity to 25-40S for curtain coating.
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| CN115286988A (en) * | 2022-08-16 | 2022-11-04 | 中国航发北京航空材料研究院 | Elastic protective coating for flexible substrate and preparation method thereof |
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