CN115286988B - Elastic protective coating for flexible substrate and preparation method thereof - Google Patents
Elastic protective coating for flexible substrate and preparation method thereof Download PDFInfo
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- CN115286988B CN115286988B CN202210980440.2A CN202210980440A CN115286988B CN 115286988 B CN115286988 B CN 115286988B CN 202210980440 A CN202210980440 A CN 202210980440A CN 115286988 B CN115286988 B CN 115286988B
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- 239000000758 substrate Substances 0.000 title claims abstract description 40
- 239000011253 protective coating Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims description 17
- 229920001971 elastomer Polymers 0.000 claims abstract description 56
- 239000005060 rubber Substances 0.000 claims abstract description 56
- 239000002904 solvent Substances 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 24
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 58
- 239000007788 liquid Substances 0.000 claims description 38
- 239000000945 filler Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 17
- 239000004925 Acrylic resin Substances 0.000 claims description 16
- 239000011347 resin Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 16
- 229920000178 Acrylic resin Polymers 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000002270 dispersing agent Substances 0.000 claims description 14
- 238000009775 high-speed stirring Methods 0.000 claims description 13
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000012046 mixed solvent Substances 0.000 claims description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 7
- YXRKNIZYMIXSAD-UHFFFAOYSA-N 1,6-diisocyanatohexane Chemical compound O=C=NCCCCCCN=C=O.O=C=NCCCCCCN=C=O.O=C=NCCCCCCN=C=O YXRKNIZYMIXSAD-UHFFFAOYSA-N 0.000 claims description 6
- -1 polysiloxane Polymers 0.000 claims description 6
- 239000004408 titanium dioxide Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000005062 Polybutadiene Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000010445 mica Substances 0.000 claims description 5
- 229910052618 mica group Inorganic materials 0.000 claims description 5
- 229920002857 polybutadiene Polymers 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 5
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 5
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 5
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 4
- 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 4
- 238000001914 filtration Methods 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 229920000098 polyolefin Polymers 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- GJYCVCVHRSWLNY-UHFFFAOYSA-N 2-butylphenol Chemical compound CCCCC1=CC=CC=C1O GJYCVCVHRSWLNY-UHFFFAOYSA-N 0.000 claims description 3
- NHSSTOSZJANVEV-UHFFFAOYSA-N 2-hydroxybutanenitrile Chemical compound CCC(O)C#N NHSSTOSZJANVEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 239000003759 ester based solvent Substances 0.000 claims 1
- 239000005453 ketone based solvent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 33
- 239000011248 coating agent Substances 0.000 abstract description 32
- 238000007789 sealing Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000030279 gene silencing Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 13
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 7
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 7
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 6
- 239000002987 primer (paints) Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 3
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 3
- 150000002576 ketones Chemical class 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 238000009924 canning Methods 0.000 description 2
- 239000008199 coating composition Substances 0.000 description 2
- 239000012975 dibutyltin dilaurate Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920000909 polytetrahydrofuran Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 239000001038 titanium pigment Substances 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- 239000008096 xylene 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
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/69—Polymers of conjugated dienes
- C08G18/698—Mixtures with compounds of group C08G18/40
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
Abstract
The invention belongs to the technical field of functional coating, and mainly aims at the practical application problem of surface protection of flexible base materials such as rubber sealing plates, rubber silencing tiles, rubber oil tanks and the like; the component B consists of polyisocyanate elastic curing agent and solvent. The coating can adapt to deformation of various flexible substrates without cracking and falling, has good adaptability to deformation of the substrates, and can play a good surface protection role on the flexible substrates in dynamic work. In addition, the protective coating disclosed by the invention is simple in construction process and beneficial to application.
Description
Technical Field
The invention belongs to the technical field of functional coatings, and particularly relates to an elastic protective coating for a flexible substrate and a preparation method thereof.
Background
Such as flexible base materials of aircraft rubber interlayer sealing plates, rubber oil tanks, ship rubber silencing tiles and the like, has the characteristic of large deformation of practical application conditions, and can cause cracking and peeling of the conventional epoxy or ductile coating when the conventional epoxy or ductile coating is applied to the surface of the conventional epoxy or ductile coating.
The Chinese patent document with publication number of CN 112680078A discloses an acrylic flexible anti-corrosion primer and a preparation method thereof, which aims at the problem that a high-thickness coating system can crack under the condition of large deformation of various structures such as vehicles, equipment, facilities, engineering machinery and the like, and an elastic substrate is not matched with a common coating due to the deformation capacity of the elastic substrate, so that the primer coating cracks, and the use requirement of the large deformation condition cannot be met, thereby developing a high-quality novel acrylic flexible anti-corrosion primer. The main resin of the technology of the document consists of flexible acrylic acid and elastic isocyanate resin, can solve the problems of separation and cracking of the matched elastic coating caused by the expansion and contraction deformation of the existing primer, has good matching property with the elastic coating, but the disclosed coating formula has large acrylic acid consumption, and the elasticity of the acrylic acid resin is not high although the flexible acrylic acid resin is adopted, so that the elasticity of the flexible primer is common as the detection result (the elongation at break is only in the range of 100-150%) of the embodiment.
Aiming at the problem, a coating material with good self-protection performance, which is matched with the elastic modulus of a high-deformation flexible substrate, needs to be developed, can meet the surface protection requirement of the flexible substrate under the dynamic/deformation working condition, has good adhesion performance, can synchronously deform along with the expansion/bending deformation of the substrate, does not crack or fall off, and also needs to have excellent performance characteristics of resisting various media and application environments.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the elastic protective coating for the flexible substrate and the preparation method thereof, and the coating provided by the invention has good adhesion with the flexible substrate, does not crack or fall off during protective application, and can meet the surface protection requirements of the flexible substrate under dynamic/deformation working conditions and the like.
The invention provides an elastic protective coating for a flexible substrate, which consists of a component A and a component B, wherein the component A consists of hydroxy acrylic resin, hydroxy liquid rubber, a filler, a dispersing agent, a leveling agent, a drier and a first solvent; the hydroxyl liquid rubber is used as main resin; the mass ratio of the hydroxy acrylic resin in the component A is lower than 20%;
the component B consists of a polyisocyanate elastic curing agent and a second solvent.
In the embodiment of the invention, the formula of the component A comprises the following components in percentage by mass:
the total mass of the components is 100 percent.
In the embodiment of the invention, the formula of the component B comprises the following components in percentage by mass:
30% -50% of polyisocyanate elastic curing agent;
50% -70% of a second solvent;
the total mass of the components is 100 percent.
In an embodiment of the present invention, the hydroxyl value of the hydroxyacrylic resin is 40 to 50mg KOH/g.
In the embodiment of the invention, the hydroxy liquid rubber is one or more of hydroxy polybutadiene liquid rubber, hydroxy butylbenzene liquid rubber, hydroxy butyronitrile liquid rubber and hydroxy polysiloxane liquid rubber; the hydroxyl value of the hydroxyl liquid rubber is 25-60 mg KOH/g.
In the embodiment of the invention, the filler is two or more of titanium dioxide, talcum powder, mica powder, aluminum oxide, aluminum tripolyphosphate, zinc oxide, zinc phosphate, various types of pigments, bentonite and silicon dioxide.
In an embodiment of the present invention, the polyisocyanate elastic curing agent is one or a mixture of several resins selected from HDI trimer, polyether polyisocyanate prepolymer, polyester polyisocyanate prepolymer and polyolefin polyisocyanate prepolymer.
In an embodiment of the present invention, the first solvent and the second solvent are independently a mixed solvent of two or more of an aromatic hydrocarbon solvent, an ester solvent, and a ketone solvent.
The invention provides a preparation method of the elastic protective coating, which comprises the following steps:
weighing raw materials according to a component A formula, adding a first solvent, hydroxy acrylic resin, hydroxy liquid rubber, a drier, a dispersing agent, a leveling agent and a filler under the condition of high-speed stirring, primarily stirring and pre-dispersing the mixed materials, grinding and dispersing until the fineness of the materials is less than 40 mu m, and filtering to obtain a component A;
weighing raw materials according to the formula of the component B, and mixing in a high-speed stirring manner to obtain the component B;
the elastic protective coating is composed of a component A and a component B.
The present invention provides the use of an elastomeric protective coating as hereinbefore described for protecting elastomeric and/or deformable substrates.
Compared with the prior art, aiming at the surface protection of the flexible substrate, the elastic protective coating provided by the invention is a bi-component coating, and the coating mainly uses functionalized liquid rubber as main resin and is matched with components such as a high-elasticity polyisocyanate curing agent and the like. In the invention, the elastic protective coating and the rubber base material have good interlayer adhesive force and high peel strength; the coating formed after the elastic protective coating is solidified on the surface of the substrate has excellent mechanical property, good elasticity and high strength, has good adaptability to deformation of the deformed substrate, can realize dynamic protection on the substrate, and can accurately regulate and control the mechanical property of the coating through the change of a resin formula so as to adapt to the surface protection requirements of the flexible deformed substrate in different application scenes. In addition, the cured coating has good medium tolerance and good protection effect on salt fog and damp-heat environment, and can effectively prevent the corrosion medium from penetrating and damaging the base material.
Experiments show that the elastic protective material of the rubber polyurethane prepared by the embodiment of the invention has the elongation at break of 250% -350%, is remarkably improved in the aspect of elastic performance, has excellent adhesive force and peel strength, and good medium and environment resistance, and can be widely applied to surface protection of base materials with higher deformation requirements, such as rubber sealing plates, rubber silencing tiles, rubber oil tanks and the like. In addition, the protective coating disclosed by the invention is simple in construction process and beneficial to application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The invention provides an elastic protective coating for a flexible substrate, which consists of a component A and a component B, wherein the component A consists of hydroxy acrylic resin, hydroxy liquid rubber, a filler, a dispersing agent, a leveling agent, a drier and a first solvent; the component B consists of a polyisocyanate elastic curing agent and a second solvent;
the hydroxyl liquid rubber is used as main resin; the mass ratio of the hydroxy acrylic resin in the component A is lower than 20 percent.
Based on the background technology, the invention provides the elastic protective coating for the flexible substrate, and the preparation method and application thereof, which can solve the problems that the existing protective coating on the surface of the flexible substrate is easy to crack and fall off.
The elastic protective coating is mainly used for protecting the surface of a flexible substrate, is a two-component coating, and consists of a first component containing main resin and a second component playing a role in curing. In the present invention, the first component comprises a hydroxy acrylic resin and a hydroxy liquid rubber; in embodiments of the present invention, the hydroxyl value of the hydroxyacrylic resin (polymerized from mainly acrylic monomers) may be 40-50 mg KOH/g, which is less than 20% by mass, preferably 10-15% by mass, of the A component.
In the component A, the hydroxyl liquid rubber is a main resin, for example, the mass ratio of the hydroxyl liquid rubber is more than 30%, and particularly can be 30-40%. The hydroxyl liquid rubber is hydroxyl-containing functionalized liquid rubber, preferably one or more of hydroxyl polybutadiene liquid rubber, hydroxyl butylbenzene liquid rubber, hydroxyl butyronitrile liquid rubber, hydroxyl polysiloxane liquid rubber and the like. The hydroxyl value of the hydroxyl liquid rubber is preferably 25-60 mg KOH/g, and further 28-58 mg KOH/g; the molecular weight or degree of polymerization parameters can be calculated indirectly from the hydroxyl number.
In addition to the resin component, the coating composition of the present invention comprises a filler, a dispersant, a leveling agent, a drier, and a first solvent. Wherein, the mass ratio of the filler is preferably 20-30%, and the filler can be two or more of titanium dioxide, talcum powder, mica powder, alumina, aluminum tripolyphosphate, zinc oxide, zinc phosphate, various pigments, bentonite and silicon dioxide, which is beneficial to regulating and controlling the mechanical property and other application properties of the coating. In some embodiments, the filler is composed of titanium dioxide, zinc oxide, and talc; in some embodiments, the filler is comprised of aluminum tripolyphosphate, mica powder, silica; in other embodiments, the filler is comprised of zinc phosphate and titanium dioxide.
In the specific embodiment of the invention, the conventional high molecular block copolymer (organic silicon or organic fluorine block copolymer) is used as a dispersing agent and a leveling agent, and no special requirements or special parameter descriptions are required. In commercial products, the dispersing agent can be BYK-P104S, BYK-110, TEGO-670, and the leveling agent can be BYK-306 and/or BYK-331. The drier can be a common drier for polyurethane, such as organic tin (dibutyl tin dilaurate), tertiary amine and the like, and each additive occupies a small amount. The first solvent is preferably 20% -30%, and specifically is a mixed solvent of two or more of an aromatic hydrocarbon solvent (such as toluene and xylene), an ester solvent (such as butyl acetate and ethyl acetate) and a ketone solvent (such as cyclohexanone and butanone).
In a preferred embodiment of the present invention, the formula of the component a, in mass percent, is:
the sum of the mass of each component is 100%; the preparation process of the coating A component comprises the following steps: weighing the raw materials according to the formula, sequentially adding a first solvent, hydroxy acrylic resin, hydroxy liquid rubber, a drier, a dispersing agent, a leveling agent and a filler into a stirring barrel under the condition of high-speed stirring, primarily stirring and pre-dispersing the mixed materials, grinding and dispersing the materials by using a sand mill, a high-speed vibration dispersing machine or other grinding equipment until the fineness of the materials is less than 40 mu m, filtering and canning to obtain the component A of the coating.
Correspondingly, the coating component B disclosed by the invention consists of a polyisocyanate elastic curing agent and a second solvent. Preferably, the mass ratio of the polyisocyanate elastic curing agent to the second solvent is 30-50%: 50-70%. The preparation process of the component B of the coating comprises the following steps: weighing the raw materials according to the formula, uniformly mixing by adopting a high-speed stirring mode, and filling and sealing for later use to obtain the component B of the coating.
In a specific embodiment of the present invention, the polyisocyanate elastic curing agent is one or a mixture of several resins selected from HDI trimer, polyether polyisocyanate prepolymer, polyester polyisocyanate prepolymer and polyolefin polyisocyanate prepolymer, preferably, the mixture is compounded with HDI (hexamethylene diisocyanate) trimer and other resin prepolymers, the molecular weight of the prepolymer may be 1000-3000, and the mass ratio of HDI is 5% -30%.
For the convenience of distinguishing, the solvents in the two-component coating are sequentially named as a first solvent and a second solvent. The first solvent and the second solvent are independently a mixed solvent of two or more of an aromatic hydrocarbon solvent, an ester solvent and a ketone solvent, preferably the same kind of mixed solvent.
The embodiment of the invention provides a preparation method of the elastic protective coating, which comprises the following steps:
the component A and the component B can be prepared by adopting the raw materials of all the components sold in the market at normal temperature respectively;
the elastic protective coating consists of a component A and a component B, and specifically comprises the following components A and B1: 1 are evenly mixed according to the mass ratio. The bi-component coating disclosed by the invention is used after two components are mixed, and the mass ratio of the component A to the component B is 1:1-1: 1.5. The stirring speed of the high-speed stirring can be 200-1000r/min; the solid content is not particularly required.
Furthermore, the present invention provides the use of an elastomeric protective coating as described hereinbefore for protecting elastomeric and/or deformable substrates. The coating disclosed by the invention is mainly and practically applied to flexible substrates such as rubber sealing plates, rubber oil tanks, rubber noise elimination tiles and the like, and the substrates have certain elasticity.
The coating material for protecting the flexible substrate is composed of specific bi-components, is matched with the elastic modulus of the high-deformation flexible substrate, has excellent self-protection performance, can meet the surface protection requirement of the flexible substrate under the dynamic/deformation working condition, has good adhesion performance, can synchronously deform along with the expansion/bending deformation of the substrate, does not crack or fall off, and has excellent performance characteristics of resisting various media and application environments.
The present invention is not limited by the following examples, and the specific embodiments can be determined according to the technical solutions and practical situations of the present invention described above. The invention will be further illustrated with reference to specific examples.
In the following examples of the present invention, the mass ratios are all as described herein. The dispersing agent is BYK-110, the leveling agent is BYK-306 or BYK-331, and the drier is dibutyl tin dilaurate.
Example 1
(1) Preparation of an elastic protective coating component A: 28.65kg of mixed solvent (dimethylbenzene: butyl acetate: cyclohexanone=4:3:3), 15kg of hydroxy acrylic resin (hydroxyl value: 50mg KOH/g), 10kg of hydroxy polysiloxane liquid rubber (hydroxyl value: 48mg KOH/g), 20kg of hydroxy polybutadiene liquid rubber (hydroxyl value: 60mg KOH/g), 0.2kg of drier, 0.65kg of dispersing agent, 0.5kg of BYK-306 leveling agent and 25kg of filler (titanium dioxide 10kg, zinc oxide 10kg and talcum powder 5 kg) are sequentially added into a stirring barrel under the condition of high-speed stirring (stirring speed: 500 r/min), and after preliminary stirring and pre-dispersing, the mixture is ground and dispersed for 5 times by a sand mill until the fineness of the material is less than 40 mu m, and the mixture is filtered and canned to obtain a coating component A.
(2) Preparation of an elastic protective coating component B: 60kg of mixed solvent (dimethylbenzene: butyl acetate: cyclohexanone=4:3:3), 5kg of HDI trimer (product brand N3390) and 35kg of polyether type polyisocyanate prepolymer (PTMEG type, molecular weight of prepolymer is 1000-3000) are added into a stirring barrel under the condition of high-speed stirring, and the mixture is filled and sealed after being stirred uniformly to prepare the coating component B.
Example 2
(1) Preparation of an elastic protective coating component A: adding 20kg of mixed solvent (dimethylbenzene: butyl acetate=3:2), 10kg of hydroxy acrylic resin (hydroxyl value 40mg KOH/g), 40kg of hydroxy polybutadiene liquid rubber (hydroxyl value 28mg KOH/g), 0.3kg of drier, 0.9kg of dispersing agent, 0.8kg of BYK-306 flatting agent and 28kg of filler (aluminum tripolyphosphate 15kg, mica powder 10kg and silicon dioxide 3 kg) into a stirring barrel in sequence under the condition of high-speed stirring (stirring speed 800 r/min), grinding and dispersing for 5 times by a sand mill until the fineness of the paint is less than 40 mu m, filtering and canning to obtain the paint component A.
(2) Preparation of an elastic protective coating component B: 50kg of mixed solvent (dimethylbenzene: butyl acetate=3:2) and 3kg of HDI trimer (product brand N3390) are added into a stirring barrel under the condition of high-speed stirring, 47kg of polyolefin type polyisocyanate prepolymer (prepolymer molecular weight is 1000-3000), and the mixture is filled and sealed after uniform stirring, so that the coating component B is prepared.
Example 3
(1) Preparation of an elastic protective coating component A: 30kg of mixed solvent (dimethylbenzene: butyl acetate: butanone=3:5:2), 12kg of hydroxy acrylic resin (hydroxyl value: 45mg KOH/g), 20kg of hydroxy poly styrene-butadiene liquid rubber (hydroxyl value: 40mg KOH/g), 25kg of hydroxy nitrile liquid rubber (hydroxyl value: 56mg KOH/g), 0.1kg of drier, 0.5kg of dispersing agent, 0.8kg of BYK-331 flatting agent and 21.6kg of filler (zinc phosphate 15kg and titanium pigment 10 kg) are sequentially added into a stirring barrel under the condition of high-speed stirring (stirring speed: 600 r/min), and after preliminary stirring and pre-dispersing, the mixture is ground and dispersed for 3 times by a sand mill until the fineness of the paint is less than 40 mu m, and the mixture is filtered and canned to obtain a paint component A.
(2) Preparation of an elastic protective coating component B: under the condition of high-speed stirring, 65kg of mixed solvent (dimethylbenzene: butyl acetate: butanone=3:5:2) and 10kg of HDI trimer (product brand N3390) are added into a stirring barrel, 25kg of polyester type polyisocyanate prepolymer (PCL, molecular weight of the prepolymer is 1000-3000) are stirred uniformly, and then the mixture is filled and sealed to prepare the coating component B.
Effect of the invention
The products of the elastic protective coating of the examples 1 to 3 are prepared according to the following components A and B1: 1, preparing test samples according to the corresponding test standard requirements, curing at 80 ℃ for 6 hours, and testing main performances.
The test results were as follows:
TABLE 1 Performance results of the elastomeric protective coatings provided by the examples of the invention
According to the embodiment, the elastic protective material of the rubber polyurethane prepared by the embodiment of the invention has the elongation at break of 250% -350%, is remarkably improved in the aspect of elastic performance, is excellent in adhesive force and peeling strength, is good in medium resistance and environmental performance, and can be widely applied to surface protection of base materials with higher deformation requirements, such as rubber sealing plates, rubber silencing tiles, rubber oil tanks and the like. The coating disclosed by the invention can be suitable for deformation of various flexible substrates without cracking and falling, has good adaptability to deformation of the substrates, and can play a good surface protection role on the flexible substrates in dynamic work. In addition, the protective coating disclosed by the invention is simple in construction process and beneficial to application.
The above examples are given solely for the purpose of illustrating the preferred formulations of the present invention and are not intended to limit the scope of the invention, since various modifications and improvements made by those skilled in the art to which the invention pertains shall fall within the scope of protection defined by the claims of the present invention.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. The foregoing is merely illustrative of the preferred embodiments of this invention, and it is noted that there is objectively no limit to the specific structure disclosed herein, since numerous modifications, adaptations and variations can be made by those skilled in the art without departing from the principles of the invention, and the above-described features can be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present invention.
Claims (5)
1. The elastic protective coating for the flexible substrate is characterized by comprising a first component and a second component, wherein the first component comprises hydroxy acrylic resin, hydroxy liquid rubber, filler, dispersing agent, leveling agent, drier and first solvent; the hydroxyl liquid rubber is used as main resin; the hydroxyl value of the hydroxyl acrylic resin is 40-50 mg KOH/g; the hydroxy liquid rubber is one or more of hydroxy polybutadiene liquid rubber, hydroxy butylbenzene liquid rubber, hydroxy butyronitrile liquid rubber and hydroxy polysiloxane liquid rubber; the filler is two or more of titanium dioxide, talcum powder, mica powder, aluminum oxide, aluminum tripolyphosphate, zinc oxide, zinc phosphate, bentonite and silicon dioxide;
the component B consists of a polyisocyanate elastic curing agent and a second solvent; the polyisocyanate elastic curing agent is one or a mixture of several resins of HDI trimer, polyether type polyisocyanate prepolymer, polyester type polyisocyanate prepolymer and polyolefin type polyisocyanate prepolymer; the first solvent and the second solvent are independently mixed solvents of two or more of aromatic hydrocarbon solvents, ester solvents and ketone solvents;
the elongation at break of the elastic protective coating for the flexible substrate is 250% -350%; the formula of the component A comprises the following components in percentage by mass:
10% -15% of hydroxy acrylic resin;
30% -40% of hydroxyl liquid rubber;
20% -30% of filler;
0.5% -1% of dispersing agent;
0.5% -1% of leveling agent;
0.1% -0.3% of drier;
20% -30% of a first solvent;
the total mass of the components is 100 percent.
2. The elastic protective coating for a flexible substrate according to claim 1, wherein the formula of the component b is as follows in mass percent:
30% -50% of polyisocyanate elastic curing agent;
50% -70% of a second solvent;
the total mass of the components is 100 percent.
3. The elastic protective coating for flexible substrates according to any one of claims 1 to 2, wherein the hydroxyl value of the hydroxyl liquid rubber is 25 to 60mg KOH/g.
4. A process for the preparation of an elastomeric protective coating according to any one of claims 1 to 3, comprising the steps of:
weighing raw materials according to a component A formula, adding a first solvent, hydroxy acrylic resin, hydroxy liquid rubber, a drier, a dispersing agent, a leveling agent and a filler under the condition of high-speed stirring, primarily stirring and pre-dispersing the mixed materials, grinding and dispersing until the fineness of the materials is less than 40 mu m, and filtering to obtain a component A;
weighing raw materials according to the formula of the component B, and mixing in a high-speed stirring manner to obtain the component B;
the elastic protective coating is composed of a component A and a component B.
5. Use of an elastomeric protective coating according to any of claims 1 to 3 for protecting elastomeric and/or deformable substrates.
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