Polysiloxane-based coating compositions

Abstract

The present invention relates to a polysiloxane-based coating composition, comprising: a polysiloxane having the following formula I; a non-aromatic epoxide resin having more than one 1,2-epoxy group / molecule and an epoxy equivalent of 100-5000; a multifunctional (meth)acrylate monomer; and a curing system comprising at least one alkoxy-functional aminosilane; wherein each R1 is a hydroxyl group or an alkyl group, an aryl group, or an alkoxy group having up to 6 carbon atoms, each R2 is independently a hydrogen group or an alkyl group or an aryl group having up to 6 carbon atoms, and wherein n is selected so that the molecular weight of the polysiloxane is 400-10000. In addition, the present invention also relates to a method for coating a surface with the coating composition and a substrate coated therewith.

Description

Field of the Invention

[0001] The present disclosure relates to polysiloxane-based coating compositions useful for protective coatings, particularly anti-corrosion coatings, and the like. Background of the Invention

[0002] The use of polysiloxane resins as coatings for corrosion protection or as ideal resin additives in forming protective coatings is known in the art. The addition of polysiloxane resins helps the wear resistance, corrosion resistance and weather resistance of the resulting cured coating film.

[0003] In practical applications, in order to further improve the various required properties of polysiloxane resin coatings and impart new functions, polysiloxane resins are often modified, such as by epoxy modification or acrylate modification, etc. Such coatings can be used to provide long-term protection for steel, concrete, aluminum and other structures under a wide range of corrosive conditions (extending from atmospheric exposure to complete immersion in highly corrosive solutions).

[0004] Epoxide resins are those having more than one 1,2-epoxy group per molecule and may be saturated or unsaturated, aliphatic, cycloaliphatic, aromatic or heterocyclic. Epoxy resins typically contain glycidyl ester or glycidyl ether groups and have an epoxide equivalent weight of 100-5000.

[0005] The compounds used for acrylate modification are generally a wide range of acrylate-functional compounds, oligomers, polymers or resins.

[0006] For example, CN105073919A discloses an epoxy-polysiloxane coating composition comprising a polysiloxane, a non-aromatic epoxide resin, and a curing system comprising a blend of at least one trialkoxy-functional aminosilane and at least one amino-functional polysiloxane resin.

[0007] In addition, CN101052671A also discloses a fast-curing modified polysiloxane composition, which comprises an alkoxy or silanol functionalized siloxane intermediate, at least one amine reactive component, an epoxy functionalized component, and a curing agent selected from amines, aminosilanes, ketimines, and aldimines. The coating composition has fast curing and improved curing properties, and can form a fully cured protective film in a shortened time.

[0008] Another prior art document CN106675133A provides an acrylate-modified polysiloxane resin, which is compounded from an active polysiloxane intermediate, a cyclohexyl-containing acrylate, a multifunctional (meth)acrylate monomer, and an aminoalkyl alkoxysilane. The cyclohexyl acrylate is prepared by an addition reaction of dicyclohexylmethane diisocyanate and hydroxy acrylate.

[0009] However, although the epoxy-modified polysiloxane coatings of the prior art have a high crosslinking density, they are not flexible enough; while the acrylic-modified polysiloxane coatings of the prior art have a low crosslinking density and have limited abrasion resistance and chemical resistance.

[0010] Thus, the present disclosure provides novel polysiloxane-based coating compositions that are improved in at least one of the following aspects: flexibility, weatherability, corrosion resistance, adhesion, chemical resistance, and abrasion resistance. Summary of the invention

[0011] The present disclosure provides a novel polysiloxane-based coating composition. According to a first embodiment, the present disclosure provides a polysiloxane-based coating composition comprising a polysiloxane having the following formula:

[0012]

[0013] Non-aromatic epoxide resins having greater than one 1,2-epoxy group / molecule and an epoxy equivalent weight of 100-5000;

[0014] Multifunctional (meth)acrylate monomers; and

[0015] A curing system comprising at least one alkoxy-functional aminosilane. According to the polysiloxane formula, each R1 is hydroxyl or an alkyl, aryl, or alkoxy group having up to 6 carbon atoms, each R2 is independently hydrogen or an alkyl or aryl group having up to 6 carbon atoms, and wherein n is selected so that the molecular weight of the polysiloxane is 400-10,000.

[0016] The inventors of the present application have found that the use of a multifunctional (meth)acrylate monomer in a polysiloxane coating composition modified with a non-aromatic epoxy resin can further significantly improve the flexibility of the epoxy-modified polysiloxane coating while at least maintaining or even possibly improving the weather resistance, abrasion resistance, chemical resistance, adhesion and other properties of the epoxy-modified polysiloxane coating.

[0017] In another embodiment, the present disclosure provides a polysiloxane-based coating composition comprising 12-65 wt % of a polysiloxane having the following formula I, based on the total weight of the coating composition:

[0018]

[0019] 8-30 wt% of a non-aromatic epoxide resin having greater than one 1,2-epoxy group / molecule and an epoxy equivalent weight of 100-5000; 1-12 wt% of a multifunctional (meth)acrylate monomer; up to 15 wt% of a cure accelerator; up to 15 wt% of a flexible epoxy resin based on a glycidyl ether of castor oil having an epoxy equivalent weight of 200-1000; and 5-40 wt% of a cure system comprising at least one alkoxy-functional aminosilane added in an amount sufficient to provide a ratio of amine equivalents to the sum of epoxy equivalents and double bond equivalents in the multifunctional (meth)acrylate monomer of 0.7:1.0 to 1.3:1.0 in the coating composition. According to the polysiloxane of formula I, each R1 is hydroxyl or an alkyl, aryl, or alkoxy group having up to 6 carbon atoms, each R2 is hydrogen or an alkyl or aryl group having up to 6 carbon atoms, and wherein n is selected so that the molecular weight of the polysiloxane is 400-10,000.

[0020] In another embodiment, the present disclosure provides a coated substrate, wherein the substrate comprises at least one surface coated with the polysiloxane-based coating composition described herein.

[0021] In another embodiment, the present disclosure provides a method for protecting a substrate surface from the undesirable effects of one or more of chemicals, corrosion, and weathering by coating the surface with a coating composition prepared by a method comprising preparing a binder component, adding a curing system to the binder component to form a fully cured polysiloxane-based coating composition, and applying the coating composition to the substrate surface to be protected before the composition becomes fully cured. The resin composition comprises a polysiloxane having the following formula I:

[0022]

[0023] A non-aromatic epoxy resin containing more than one 1,2-epoxy group / molecule and an epoxy equivalent weight of 100-5000; and a multifunctional (meth)acrylate monomer. According to the polysiloxane formula, each R1 is a hydroxyl group or an alkyl, aryl, or alkoxy group having up to 6 carbon atoms, each R2 is a hydrogen or an alkyl or aryl group having up to 6 carbon atoms, and wherein n is selected so that the molecular weight of the polysiloxane is 400-10000. The curing system comprises at least one alkoxy-functional aminosilane; and an optional curing accelerator. DETAILED DESCRIPTION

[0024] The present disclosure provides a polysiloxane-based coating composition that exhibits improved properties, such as, but not limited to, improved weathering, chemical, corrosion or oxidation resistance, and / or improved flexibility compared to conventional epoxy-modified polysiloxane coating compositions.

[0025] Likewise, it should be understood that any numerical range described herein is intended to include all subranges therein. For example, the range "1-10" is intended to include all subranges between the stated minimum value 1 and the stated maximum value 10 (and including the end values), i.e., having a minimum value equal to or greater than 1 and a maximum value equal to or less than 10.

[0026] In this application, the use of the singular includes the plural and the plural includes the singular, unless otherwise expressly provided. In addition, in this application, the use of "or" means "and / or" unless otherwise expressly provided, but in some cases "and / or" may be expressly used. Including means "including but not limited to".

[0027] As used herein, unless expressly specified otherwise, all numbers such as those expressing values, ranges, amounts or percentages may be read as if preceded by the word "about", even if the term does not expressly appear. Therefore, unless indicated to the contrary, the numerical values ​​and ranges set forth in the following specification and claims may vary depending on the desired properties sought to be obtained by the practice of the present invention. At the very least, and not intending to apply the doctrine of equivalents to limit the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.

[0028] Although the numerical ranges and parameters setting forth the broad scope of various embodiments of the invention are approximate, the numerical values ​​set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0029] According to different embodiments, the present disclosure provides a kind of coating composition based on polysiloxane, which is suitable for coating surface and providing improved flexibility, chemical resistance, corrosion resistance and / or weather resistance. The coating based on polysiloxane can be advantageously formulated as a two-component or multi-component coating system, i.e. comprising a base component A (comprising at least a polysiloxane of formula I and a non-aromatic epoxide resin and a multifunctional (meth) acrylate monomer) and a curing system component B, wherein the composition of the combination reacts to form a crosslinked polysiloxane polymer structure. In certain embodiments, the coating composition may further include a flexible epoxy resin, such as a glycidyl ether based on castor oil. In other embodiments, the coating composition may optionally include a curing accelerator, which includes at least one metal catalyst.

[0030] Regarding the base component A, it may, for example, comprise a blend of a polysiloxane of formula I, a non-aromatic epoxide resin, and an optional organooxysilane. Different embodiments of the base component A include, but are not limited to, those polysiloxanes having formula I:

[0031]

[0032] Wherein each R1 can be selected from hydroxyl and alkyl, aryl, and alkoxy with up to 6 carbon atoms. Each R2 can be selected from hydrogen and alkyl and aryl with up to 6 carbon atoms. In formula I, integer n can be selected so that the molecular weight of polysiloxane is 400-10000 dalton. In a specific embodiment, R1 and R2 can include a group with less than or equal to 6 carbon atoms, for example, to promote the rapid hydrolysis of polysiloxane, and the reaction can be driven by the volatility of the alcohol product of the hydrolysis. In certain embodiments, R1 and R2 groups with more than 6 carbon atoms can weaken the hydrolysis of polysiloxane, which is attributed to the relatively low volatility of each alcohol analog. Methoxy, ethoxy and silanol functional polysiloxane (it has selected n so that the molecular weight is 400-2000) can be used in specific embodiments to prepare the coating composition of the present disclosure.

[0033] According to various embodiments, suitable methoxy functional polysiloxanes may include: DOWSIL 3074, commercially available from Dow Corp.; or Silres IC 232 and IC 235, commercially available from Wacker. Silanol functional polysiloxanes include, but are not limited to, Dow's DC840, Z6018, Q1-2530 and 6-2230 intermediates.

[0034] According to various embodiments, the coating composition may contain 12-65 wt% of the polysiloxane of formula I based on its total weight. In other embodiments, the coating composition may contain 18-55 wt% of the polysiloxane of formula I. In one embodiment, the coating composition may contain about 20-45 wt% of the polysiloxane of formula I. In another preferred embodiment, at least 80 wt%, preferably at least 90 wt%, or more preferably at least 95 or 98 to 100 wt% of all polysiloxane components in the coating composition are composed of polysiloxane of formula I.

[0035] Suitable epoxy resins that can be used to form coatings of embodiments of the present disclosure include at least non-aromatic epoxy resins containing greater than one and in certain embodiments two 1,2-epoxy groups / molecule. As used herein, the terms "epoxide resin" and "epoxy resin" are used interchangeably. In specific embodiments, the epoxy resin can be a liquid, rather than a solid, and the epoxy equivalent weight can be 100-5000, 100-2000 in other embodiments, and 100-500 in still other embodiments, and the reactivity is about 2.

[0036] Preferably, the non-aromatic epoxy resin is a compound having one or more 1,2-epoxy groups at the end or side of a cyclic, linear or branched aliphatic or alicyclic hydrocarbon group. Here, preferred is a non-aromatic hydrogenated epoxy resin, wherein the cyclic, linear or branched aliphatic or alicyclic hydrocarbon group is hydrogenated or saturated. In another preferred embodiment, the cyclic, linear or branched aliphatic or alicyclic hydrocarbon group is composed of C and H and does not contain heteroatoms such as O, N or P. In addition, the cyclic, linear or branched hydrocarbon group can, for example, have 2-500, such as 5-300 or 200 or 100 carbon atoms.

[0037] In certain preferred embodiments, the epoxide resin can be a non-aromatic hydrogenated epoxy resin, such as a non-aromatic hydrogenated cyclohexanedimethanol, a diglycidyl ether of a hydrogenated bisphenol A type epoxide resin, such as Eponex 1510, and Eponex 1513 (hydrogenated bisphenol A-epichlorohydrin epoxy resin), commercially available from Hexion; Santolink LSE-120, commercially available from Monsanto, Springfield, MA.; Epodil 757 (cyclohexanedimethanol diglycidyl ether), commercially available from Pacific Anchor, Allentown, PA; Araldite XUGY 358 and PY 327, commercially available from CibaGeigy, Hawthorne, NY; Epirez 505, commercially available from Rhone-Poulenc, Lousiville, KY; Aroflint 393 and 607, commercially available from Reichold, Pensacola, FL; and ERL4221, commercially available from Union Carbide, Tarrytown, NY. Other suitable non-aromatic epoxy resins may include EP-4080E (cycloaliphatic epoxy resin), commercially available from Adeka, Japan; ST-3000, commercially available from KUKDO CHEMICAL; DER 732 and DER 736. In a specific embodiment, the epoxy resin may be EP-4080E. Such non-aromatic hydrogenated epoxide resins may be desirable due to their limited reactivity of about 2, which promotes the formation of linear epoxy polymers and prevents the formation of crosslinked epoxy polymers. Without intending to be limited to a specific explanation, it is believed that the resulting linear epoxy polymer (which is formed by adding a curing agent to the epoxy resin) is at least partially responsible for the enhanced weatherability of such a composition.

[0038] In the coating composition according to the present invention, it is necessary to use a non-aromatic epoxy resin because, compared with other epoxy resins or epoxy acrylic resins, the non-aromatic epoxy resin exhibits more excellent weather resistance, no yellowing, suitable viscosity and curing speed.

[0039] According to various embodiments, the coating composition may include 8-30 wt %, preferably 10-25 wt %, more preferably 10-22 wt % of a non-aromatic epoxy resin, more preferably a non-aromatic hydrogenated epoxy resin, based on the total weight of the coating composition.

[0040] The coating composition of the present invention must also contain a multifunctional (meth)acrylate monomer. When formulated into a two-component or multi-component composition, the multifunctional (meth)acrylate monomer is contained in the base component A. Here, the multifunctional (meth)acrylate monomer refers to a non-polymeric monomer compound having at least 2, 3 or 4 or more (meth)acrylate groups. Advantageously, the multifunctional (meth)acrylate monomer suitable for the present invention is a monomer compound having at least 2, 3 or 4 or more (meth)acrylate groups at the end or side of the skeleton composed of a cyclic, linear or branched aliphatic or alicyclic hydrocarbon group, wherein the aliphatic or alicyclic hydrocarbon group is composed of C and H atoms and optionally one or more, such as 2 or 3 heteroatoms such as O, preferably without heteroatoms. In some suitable cases, the H atom may also be substituted by, for example, halogen.

[0041] Typically, the multifunctional (meth)acrylate monomers can be formed by esterification of aliphatic or alicyclic alcohols corresponding to aliphatic or alicyclic hydrocarbon groups as defined above with (meth)acrylic acid. In addition, advantageously, the multifunctional (meth)acrylate monomers suitable for the present invention do not have additional functional groups, such as amino, ester, carbonyl, carbamate and epoxy groups, in addition to the (meth)acrylate functional groups. Therefore, it is obvious that, according to such a definition, for example, epoxy (meth)acrylates or polyurethane (meth)acrylates based on aromatic epoxy resins are not multifunctional (meth)acrylate monomers according to the present invention.

[0042] Examples of suitable multifunctional (meth)acrylate monomers include trimethylolpropane tri(meth)acrylate, tripropylene glycol tri(meth)acrylate, dipropylene glycol di(meth)acrylate, butanediol di(meth)acrylate, cyclohexanedimethanol di(meth)acrylate, hexanediol di(meth)acrylate, glycerol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tri(meth)acrylate, neopentyl glycol di(meth)acrylate, neopentyl glycol propoxylate di(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, and propoxylated glycerol tri(meth)acrylate.

[0043] Preferred multifunctional (meth)acrylate monomers include hexanediol diacrylates, such as 1,6HEXANEDIOL DIACRYLATE (available from ALLNEX), AGISYN 2816 (available from DSM), SR238 (available from ARKEMAINC), PHOTOMER 4017 (available from IGM RESINS); trimethylolpropane triacrylate, such as available from Cognis, Exton, Pa. under the trade name Photomer 4006; neopentyl glycol propoxylate diacrylate, such as available from IGM under the trade names Photomer 4126 and 4127; ethoxylated trimethylolpropane triacrylate, such as available from IGMs under the trade name Photomer 4129; and propoxylated glycerol triacrylate, such as available from IGM under the trade name Photomer 4094.

[0044] According to different embodiments, the coating composition comprises 1-12 wt%, preferably 2-8 wt%, for example 4 or 7 wt% of multifunctional (meth)acrylate monomers based on the total weight of the coating composition. Preferably, the coating composition of the present invention does not comprise epoxy (meth)acrylate and polyurethane (meth)acrylate (whose molecules contain acrylic functional groups and urethane bonds).

[0045] Different embodiments of the coating composition also include a curing system. When formulated as a two-component or more component coating composition, the curing system is included in component B. According to the present invention, the curing system includes one or more alkoxy-functional aminosilanes. In certain embodiments, the average alkoxy functionality value of one or more alkoxy-functional aminosilanes can be, for example, 2.0 or more, or 2.2 or more, or 2.5 or more. In a specific embodiment, based on the total weight of the coating composition, the curing system can account for 5-30% by weight of the coating composition, and in other embodiments, 10-20% by weight of the coating composition, for example, about 14% by weight. In certain embodiments, the addition amount of the curing system is sufficient to provide a ratio of 0.7:1.0 to 1.3:1.0 of the sum of the amine equivalents and the double bond equivalents in the epoxy equivalent and the multifunctional (meth) acrylate monomer in the coating composition, and in other embodiments, the ratio is 0.95:1.00 to 1.05:1.00.

[0046] In one embodiment, the alkoxy-functional aminosilane may comprise at least one dialkoxy-functional aminosilane and / or at least one trialkoxy-functional aminosilane, preferably a trialkoxy-functional aminosilane.

[0047] According to these embodiments, the at least one dialkoxy-functional aminosilane may have the following structure:

[0048]

[0049] According to the structure of the dialkoxy functional aminosilane, R5 can be a difunctional organic group independently selected from the following: aryl, alkyl, dialkylaryl, alkoxyalkyl, alkylaminoalkyl and cycloalkyl, each alkyl, aryl, cycloalkyl and alkoxy containing up to 6 carbon atoms, and each R6 and R7 can be independently selected from alkyl, hydroxyalkyl, alkoxyalkyl or hydroxyalkoxyalkyl, wherein each alkyl, aryl, cycloalkyl and alkoxy in the R6 and R7 groups contains up to 6 carbon atoms. According to a specific embodiment, each R6 and R7 group can be independently selected from (C1-C6) alkyl and each R5 is independently selected from (C1-C6) alkyl and (C1-C6) alkylamino (C1-C6) alkyl. For example, suitable dialkoxy-functional aminosilanes may include aminopropylmethyldimethoxysilane, aminopropylethyldimethoxysilane, aminopropylethyldiethoxysilane, N-β-aminoethyl-γ-aminopropylmethyldimethoxysilane, N-2-aminoethyl-3-aminoisobutyl-methyldimethoxysilane and aminoneohexylmethyldimethoxysilane. Examples of suitable commercially available dialkoxy-functional aminosilanes include 1505 (aminopropylmethyldimethoxysilane, whose amine equivalent is 81.57, commercially available from Evonik Corp., USA) and A-2639 (amino neohexylmethyldimethoxysilane, with an amine equivalent of 102.7, commercially available from Momentive performance materials and A-2120 (N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane).

[0050] According to these embodiments, the trialkoxy-functional aminosilane has the general formula

[0051]

[0052] Wherein R5 is selected from following difunctional organic group: aryl, alkyl, dialkyl aryl, alkoxyalkyl, alkylaminoalkyl or cycloalkyl, each R6 is independently alkyl, hydroxyalkyl, alkoxyalkyl or hydroxyalkoxyalkyl containing less than 6 carbon atoms. According to specific embodiments, each R6 group can be independently selected from (C1-C6) alkyl and each R5 is independently selected from (C1-C6) alkyl and (C1-C6) alkylamino (C1-C6) alkyl.

[0053] Suitable trialkoxy-functional aminosilanes may include aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminopropyltripropoxysilane, aminoneohexyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltriethoxysilane, N-phenylaminopropyltrimethoxysilane, trimethoxysilylpropyldiethylenetriamine, 3-(3-aminophenoxy)propyltrimethoxysilane, aminoethylaminomethylphenyltrimethoxysilane, 2-aminoethyl-3-aminopropyl-tri-2-ethylhexyloxysilane, N-aminohexylaminopropyltrimethoxysilane and trisaminopropyltrimethoxyethoxysilane. Examples of suitable commercially available trialkoxy-functional aminosilanes include A-1100, KH--540 (aminopropyltrimethoxysilane, its amine equivalent is 89.7), A-1110, KH-550 (aminopropyltriethoxysilane, its amine equivalent is 111), A-1120 (N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane) and A-1637, commercially available from Momentive performance materials. Other suitable trialkoxy-functional aminosilanes include those described in US Pat. No. 7,459,515 at column 10, lines 38-65, incorporated herein by reference.

[0054] According to those embodiments in which the curing system comprises a blend of at least one dialkoxy-functional aminosilane and at least one trialkoxy-functional aminosilane, the aminosilanes are mixed together in a certain ratio to provide a desired average alkoxy functionality value. The average alkoxy functionality value of the at least one dialkoxy-functional aminosilane can be about 2.0, and the average alkoxy functionality value of the at least one trialkoxy-functional aminosilane can be about 3.0, and the average alkoxy functionality value of the alkoxyaminosilane blend can be about 2.2-2.8. For example, the blend can include 10-90 wt % or 27-73 wt % of dialkoxy-functional aminosilane and 90-10 wt % or 72-28 wt % of trialkoxy-functional aminosilane, based on the total weight of the aminosilanes in the blend.

[0055] However, in a more preferred embodiment, at least 80% by weight, preferably at least 85% by weight, more preferably at least 90% by weight, even more preferably at least 95% by weight or 98% by weight or 100% by weight of the curing system consists of alkoxy-functional aminosilanes as described above, particularly preferably trialkoxy-functional aminosilanes. It has been found that, in particular in the presence of trialkoxy-functional aminosilanes and multifunctional (meth)acrylates, the polysiloxane-based coating composition is able to combine a fast curing reaction rate with improved flexibility very well without adverse effects.

[0056] The specific embodiment of the curing system may further include a curing accelerator. The curing accelerator may be a metal catalyst in the form of an organometallic catalyst comprising the one or more metals. The curing accelerator comprising at least one organometallic catalyst may be used to further accelerate the purpose of curing the coating composition to a protective coating in a wide temperature range. In certain uses of the coating composition requiring ambient temperature to cure, the organometallic catalyst curing accelerator may provide a curing rate that is accelerated at ambient temperature. Suitable curing accelerators may include at least one metal catalyst comprising a metal selected from zinc, manganese, zirconium, titanium, cobalt, iron, lead, bismuth or tin, and having the formula:

[0057]

[0058] Where "Me" is metal, R 10 and R 11 R may be independently selected from acyl, alkyl, aryl or alkoxy, wherein the acyl, alkyl, aryl and alkoxy may each have up to 12 carbon atoms. 12 and R 13 Can be selected from the 10 and R 11 Said groups are either selected from inorganic atoms such as halogen, sulfur or oxygen. In a specific embodiment, R 10 , R 11 , R 12 and R 13The group can be selected from butyl, acetate, laurate, octanoate, neodecanoate or cycloalkanoate. In a specific embodiment, the curing accelerator can be an organic metal tin catalyst or a titanium catalyst, such as dibutyl tin dilaurate, dibutyl tin diacetate, dibutyl tin diacetyl diacetonate, dioctyl tin dilaurate, dioctyl tin diacetate or an organic titanate such as tetrabutyl titanate. Applicable metal catalysts can be commercially available, such as TYZOR TNBTTITANATE (commercially available from DORF KETAL CHEMICALS) and FASCAT 4200 (commercially available from PMC ORGANOMETALLIXINC). In certain embodiments, the curing system can include up to 10 % by weight of a curing accelerator, and in other embodiments 0.02-7 % by weight of a curing accelerator, based on the gross weight of the curing system.

[0059] In the epoxy polysiloxane coating composition of the present disclosure, when formulated into a two-component or higher component coating composition, the weight ratio of the base component A to the curing system component B may advantageously be in the range of 70:30 to 90:10, such as 75:25 to 87:13.

[0060] In a specific embodiment, the coating composition of the present disclosure may further include a flexible epoxy resin, such as a flexible resin based on glycidyl ether of castor oil, CAS No. 74398-71-3. For example, in certain embodiments, the flexible epoxy resin may be a glycidyl ether of castor oil, the epoxy equivalent of which is 200-1000. Examples of suitable glycidyl ethers of castor oil include, but are not limited to, Heloxy TM505, which is a castor oil polyglycidyl ether with an epoxy equivalent weight of 200-500, commercially available from Momentive Specialty Chemicals, Columbus, OH, and other commercially available castor oil polyglycidyl ethers under CAS No. 74398-71-3. Other suitable flexible epoxy resins may include Erisys GE-22 diglycidyl ether of cyclohexanedimethanol, Erisys GE-36 diglycidyl ether of polyoxypropylene glycol, Erisys GE-60 sorbitol glycidyl ether (Erisys series of diglycidyl ethers are commercially available from CVC Specialty Chemicals, Moorestown, NJ) and CoatOSil*2810 diepoxy-functional polydimethylsiloxane (commercially available from Momentive Specialty Chemicals, Columbus, OH). The flexible epoxy resin can be included in the coating composition, wherein the coating composition comprises up to 15 wt % of the flexible epoxy resin based on the total weight of the coating composition. In other embodiments, the coating composition can comprise 2-15 wt % of the flexible epoxy resin, or even 5-11 wt % of the flexible epoxy resin.

[0061] According to certain embodiments, the coating composition may optionally include one or more organooxysilanes. With respect to the optional organooxysilane used in certain embodiments, the organooxysilane may have the following general formula:

[0062]

[0063] Where R 10 R may be selected from an alkyl or cycloalkyl group containing up to 6 carbon atoms or an aryl group containing up to 10 carbon atoms. 11 is independently selected from an alkyl, hydroxyalkyl, alkoxyalkyl or hydroxyalkoxyalkyl group containing up to 6 carbon atoms. 11 Groups having up to 6 carbon atoms may be included, for example, to promote rapid hydrolysis of the organooxysilane, which reaction may be driven by the volatility of the alcohol product of the hydrolysis. Without intending to be limiting, it is believed that R having greater than 6 carbon atoms 11The group can impair the hydrolysis of the organooxysilane, which is attributed to the relatively low volatility of each alcohol analog. In a specific embodiment comprising the organooxysilane, the silane can be a trialkoxysilane, such as A-163 (methyltrimethoxysilane), A-162 and A-137 of UnionCarbide and Z6070 and Z6124 of Dow Corning. According to those embodiments that can include the organooxysilane, the coating composition can include 0.1-10 weight % of the organooxysilane. In one embodiment the coating composition can optionally include 0.7-10 weight % of the organooxysilane or even 1-5 weight % of the organooxysilane.

[0064] According to different embodiments, the coating composition may include one or more other ingredients, including but not limited to, including corrosion inhibitors, dehumidifiers, pigments, fillers, rheology modifiers, plasticizers, defoamers, adhesion promoters, suspending agents, leveling agents, thixotropic agents, catalysts, pigment wetting agents, asphalt and asphalt extenders, anti-settling agents, diluents, UV light stabilizers, defoamers, dispersing aids, solvents, surfactants or any mixture thereof. Those skilled in the art of resin coating compositions will appreciate that other conventional ingredients can be incorporated into the coating composition and are within the scope of different embodiments of the present disclosure described herein. When formulated into a two-component or more-component coating composition, the above-mentioned other ingredients can be selected and included in any one component as needed, for example, can be advantageously included in the base component A. In a specific embodiment, based on the total weight of the coating composition, the polysiloxane coating composition can include up to 80% by weight, for example up to 65% by weight, 50% by weight, 30% by weight, 20% by weight or 10% by weight of such ingredients.

[0065] In certain embodiments, the coating composition may additionally include one or more corrosion inhibitors. Examples of suitable corrosion inhibitors include, but are not limited to, zinc phosphate-based corrosion inhibitors, such as micronized SZP-391, 430 calcium phosphate, ZP zinc phosphate, SW-111 Strontium phosphosilicate, 720 Mixed metal phosphocarbonates and 550 and 650 are all organic corrosion inhibitors commercially available from Halox, Hammond, IN. Other suitable corrosion inhibitors may include ZPA Zinc Aluminum Phosphate ZMP zinc molybdenum phosphate is commercially available from Heucotech Ltd, Fairless Hills, PA. Corrosion inhibitors can be included in the coating composition in an amount of 1-7% by weight. Various embodiments of the coating composition may additionally include one or more light stabilizers, such as liquid hindered amine light stabilizers ("HALS") or UV light stabilizers. Examples of suitable HALS include, for example HALS compounds such as 292, 123, 622, 783, 770, commercially available from BASF, Ludwigshafen, Germany. Examples of suitable UV light stabilizers include, for example Light stabilizers, e.g. UV-1164L (2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-isooctyloxyphenyl)-1,3,5-triazine), commercially available from Cytec Industries, Woodland Park, NJ, and 1130 and 328, commercially available from BASF, Ludwigshafen, Germany. The one or more light stabilizers may be included in the coating composition in an amount of 0.25-4.0 wt%.

[0066] Suitable pigments for certain embodiments of the coating composition can be selected from organic or inorganic coloring pigments, and can include for example titanium dioxide, carbon black, lamp black, zinc oxide, natural and synthetic red, yellow, brown and black iron oxides, toluidine yellow and benzidine yellow, phthalocyanine blue and green, and carbazole violet, and body pigments, including ground and crystallized silica, barium sulfate, magnesium silicate, calcium silicate, mica, mica-containing iron oxide, calcium carbonate, zinc powder, aluminum and aluminum silicate, gypsum, feldspar, etc. It should be understood that the amount of the pigment that can be used to form the composition is variable, depending on the specific composition application, and can be zero when a transparent composition is desired. In different embodiments, the polysiloxane composition can include up to 50% by weight of fine-grained pigments and / or fillers. In some embodiments, using more than 50% by weight of fine-grained pigments and / or filler components will produce a composition that is too sticky and difficult to apply. In certain compositions where it is desirable to have greater than 50% pigment or filler in the final composition, such as zinc-rich primers (which contain up to 90% zinc in the dry film) or flooring compositions (which may contain up to 80% pigment / filler), the pigment or filler may be packaged separately as a third component. Certain embodiments of the coating composition may contain 20-35% by weight of fine particle size filler and / or pigment, depending on the specific end use.

[0067] The pigment and / or filler component can be typically added to Part A comprising the base component, for example by dispersing with a toothed dispersing disk to a maximum grind fineness of 30 μm, or alternatively, can be ball milled or sand milled to the same grind fineness before adding the polysiloxane component. In certain embodiments, the selection of fine particle size pigments or fillers and dispersion or grinding to 30 μm allows the mixed base resin and curing components to be atomized with conventional air, air-assisted airless, airless and electrostatic spray equipment during application, and can provide a smooth uniform surface appearance after application.

[0068] The polysiloxane-based coating compositions of various embodiments of the present disclosure can be formulated to be applied with conventional air, airless, air-assisted airless and electrostatic spray equipment, brushes or rollers. The compositions of certain embodiments can be used as protective coatings for steel, galvanizing, aluminum, concrete and other substrates at dry film thicknesses of 25 microns to 2 millimeters. Thus, the pigment or filler component that can be used to form the compositions of the present disclosure can be selected from fine-grained materials, such as, but not limited to, having at least 90% by weight of a size greater than 1250 mesh.

[0069] Preferably, the formulated coating composition may be free of water, in particular, free of specially added water, but the coating composition requires water during the curing process, and the required moisture may come from air humidity, so it is moisture curing.

[0070] The coating compositions based on polysiloxanes according to various embodiments of the present disclosure are generally low viscosity and can be sprayed without the addition of solvents. However, in certain embodiments, organic solvents can be added to improve atomization and application with electrostatic spraying devices, or when applied by brushes, rollers or conventional air and airless spraying devices, to improve fluidity, leveling and / or appearance. Exemplary solvents that can be used for this purpose include, but are not limited to, esters, ethers, alcohols, ketones, glycols, etc. In certain embodiments, the amount of solvent added to the compositions of the present disclosure may be limited to about 420 g of solvent / liter of composition by government regulations under the Clean Air Act.

[0071] The coating composition of the present disclosure can be provided as a multi-component system comprising at least two components or two packages. The so-called multi-component system is a well-known term in the coating field, which refers to the ingredients of the coating composition being formulated into multiple parts or components, and then each part or component is packaged in different containers, such as moisture-proof containers. In the multi-component system, the first package (i.e., the first component or base material component A) can include the polysiloxane of the formula I, the non-aromatic epoxide resin, the multifunctional (meth) acrylate monomer, any pigment and / or filler component, additive and / or solvent (if desired). The second package (i.e., the second component or curing system component B) includes one or more alkoxy-functional aminosilanes and an optional curing accelerator. The coating composition of some embodiments of the present disclosure can also be supplied as a three-component or three-package system, wherein the pigment and / or filler or other additives are supplied in separate packages or components, such as for flooring materials / concrete protection formulas or zinc-rich primers.

[0072] The coating composition according to the present disclosure can be applied and fully cured under ambient temperature conditions of -6°C to 50°C. Curing is slowed at temperatures below -18°C. However, the coating composition of various embodiments of the present disclosure can be applied at baking or curing temperatures of up to 40°C-120°C.

[0073] The epoxy resin and multifunctional (meth)acrylate monomer in the base component can be cured with a sufficient curing system, wherein the primary amino group on the silane will react with the double bond of the acrylic monomer to open the double bond through Michael addition reaction, and its reaction rate will be faster than the curing rate of hydrogenated epoxy resin; and the amine hydrogen reacts with the epoxy group of the epoxy resin to form an epoxy chain polymer, and reacts with the polysiloxane to form a polysiloxane polymer, wherein the epoxy chain polymer and the polysiloxane polymer can be copolymerized to form a cured cross-linked epoxy-polysiloxane polymer composition.

[0074] In certain embodiments, the epoxy resin and multifunctional (meth)acrylate monomer components can be cured with sufficient curing system to provide 0.7-1.3 amine equivalents, preferably 0.8-1.1 amine equivalents per 1.0 double bond equivalents in the epoxy and multifunctional (meth)acrylate monomers.

[0075] The coating compositions according to various embodiments of the present disclosure can exhibit improved flexibility, excellent corrosion resistance, weather resistance, wear resistance, chemical resistance, one or more performance improvements, allow unlimited recoating, and provide flexibility superior to conventional epoxy-polysiloxane coating compositions. The polysiloxane coating compositions of the present disclosure can exhibit unexpected and surprising improvements in chemical corrosion resistance and weather resistance, as well as high tensile and compressive strength, flexibility, and excellent impact resistance and wear resistance.

[0076] Some embodiments of the present disclosure may also include a coated substrate comprising a substrate having at least one surface coated with a coating composition according to the embodiments described herein. The coating composition of the present disclosure may be applied to the desired substrate surface to protect it from aging, impact and exposure to corrosion and / or chemicals. Exemplary substrates that may be treated with the coating composition described herein include, but are not limited to, wood, plastics, concrete, vitreous surfaces and metal surfaces. The coating composition according to the embodiments described herein may be used as a topcoat coating, which is directly arranged on the substrate surface itself or is arranged on one or more prior or other primers or intermediate paint coatings, such as inorganic or organic primer coatings, which are arranged on the substrate surface to achieve the desired purpose.

[0077] Embodiments of the present disclosure provide a method for protecting a substrate surface from the undesirable effects of one or more chemicals, corrosion and climate, which is coated with a coating composition prepared by the following method, such as at least one surface of a substrate described herein, the method comprising: forming a base component, adding a curing system to the base component to form a fully cured polysiloxane coating composition, and applying the coating composition to at least one surface of the substrate to be protected before the coating composition becomes fully cured. The base component can be formed by combining at least the following ingredients as described above: a polysiloxane having formula I, a non-aromatic epoxide resin and a multifunctional (meth) acrylate monomer. The curing system comprises at least one alkoxy-functional aminosilane as described above and optionally comprises at least one catalyst and / or curing accelerator. In different embodiments, the amine equivalent of the curing system can be 112-250g / NH. In certain embodiments, the base component can further include a flexible epoxy resin based on a glycidyl ether of castor oil, and the epoxy equivalent is 200-1000.

[0078] The coating compositions of the various embodiments described herein can be applied to the surface to be treated by conventional techniques such as spraying or brushing, and are generally applied to a thickness of 25-250 microns, or in some embodiments, a film of up to 1.5 millimeters of thickness. If desired, the multilayer of the coating composition can be applied to the surface to be protected. For example, for wooden substrates such as the furniture industry, the coating can be applied with a dry film thickness of 75-125 microns to provide the desired degree of protection for the surface of the lower layer. On other surface structures, a coating of appropriate thickness can be applied to provide the desired level of protection. Once the coating composition is applied to at least one surface of the substrate, it can be cured at ambient temperature until fully cured, or alternatively, it can be cured at a high temperature of up to 150°C-200°C from ambient temperature, for example, the coated substrate is placed in a drying oven or a curing oven. The substrate can be removed from the oven after the coating composition is fully cured or the coating composition is partially cured, and thereafter the coating composition can continue to cure at ambient temperature on the substrate until fully cured.

[0079] These and other features of the various embodiments of the present disclosure will become more apparent by considering the following examples. The various embodiments of the present disclosure described in the following examples are not to be construed as limiting the present invention to their details. All parts and percentages in the examples and throughout the specification are by weight unless otherwise indicated.

[0080] Example

[0081] The following examples describe the preparation of various embodiments of coating compositions for coating purposes.

[0082] In these examples, exemplary epoxysilicone coating systems according to the present disclosure were formulated and tested for drying, abrasion resistance, flexibility, weathering, corrosion resistance, and chemical resistance and compared to comparative coating systems.

[0083] Example 1 - Preparation of base component A1

[0084] The base component A for the formulation of the present invention was prepared as follows, with the weight ratios of the ingredients shown in Table 1: Hydrogenated bisphenol A epoxy resin (EPONEX 1510, 190 g, commercially available from Hexion) was weighed into a 1-liter stainless steel mixing container and placed under a high-speed disperser equipped with a toothed dispersing disk. A thixotropic agent (MONORAL 8800K, 10 g, commercially available from HS CHEM COLTD) was added to the mixing container while stirring and dispersing at high speed for 10 minutes, followed by the addition of a surfactant (DISPERBYK-182, 5 g, commercially available from BYK). Then, pigment titanium dioxide (BLR-895, 250 g, commercially available from LOMON BILLIONS), a filler (1250 mesh barium sulfate, 120 g) were added and dispersed at high speed, while the temperature of the mixture reached 65°C and was maintained for 30 minutes until a fineness of less than 30 μm was obtained. Then add multifunctional (meth)acrylate monomer (1,6-hexanediol diacrylate, 50 g, commercially available from Allnex), polysiloxane resin (Dowsil 3074, 250 g, commercially available from Dow), defoamer (TEGOFOAMEX N, 3 g, TEGO FOAMEX 840, 2 g, commercially available from EVONIK), leveling agent (Dowsil 57 additive, 5 g, commercially available from Dow), light stabilizer (TINUVIN 292, 15 g, commercially available from BASF), flexible epoxy resin (HELOXY 505, 40 g, commercially available from Hexion) and solvent (xylene, 70 g), while stirring slowly. Until the mixture is uniform. And then pour into an iron can and store as base component A1.

[0085] Example 2 - Preparation of base component A2

[0086] The base component A2 for the formulation of the present invention was prepared as follows, with the weight ratios of the ingredients shown in Table 1: Hydrogenated bisphenol A epoxy resin (EPONEX 1510, 220 g, commercially available from Hexion) was weighed into a 1-liter stainless steel mixing container and placed under a high-speed disperser equipped with a toothed dispersing disk. A thixotropic agent (DISPARLON 6500, 13 g, commercially available from KUSUMOTOCHEMICALS) was added to the mixing container while stirring and dispersing at high speed for 10 minutes, followed by the addition of a surfactant (RHODAFAC RE-610, 5 g, commercially available from SOLVAY). Then, a pigment titanium dioxide (BLR-895, 250 g, commercially available from LOMON BILLIONS) and a filler (1250 mesh barium sulfate, 120 g) were added and dispersed at high speed, while the temperature of the mixture reached 65° C. and was maintained for 30 minutes until a fineness of less than 30 μm was obtained. Then add multifunctional (meth)acrylate monomer (1,6-hexanediol diacrylate, 75 g, commercially available from Allnex), polysiloxane resin (Dowsil 3074, 240 g, commercially available from Dow), defoamer (TEGO FOAMEX N, 3 g, TEGO FOAMEX 840, 2 g, commercially available from EVONIK), leveling agent (Dowsil 57 additive, 5 g, commercially available from Dow), light stabilizer (TINUVIN 292, 15 g, commercially available from BASF) and solvent (xylene, 52 g), while stirring slowly. Until the mixture is uniform. And then pour into an iron can and store as base component A2.

[0087] Example 3 - Preparation of Comparative Example Base Component AR1

[0088] The preparation process and dosage of the base component A2 of the coating composition of the present invention are similar to the above, and the weight ratio of each component is shown in Table 1, except that epoxy acrylic resin (SETALUX-8503-SS-60, 50 g, commercially available from Allnex) is added to the formula.

[0089] Example 4 - Preparation of Comparative Example Base Component AR2

[0090] The preparation process and dosage of the base material component A2 of the coating composition of the present invention are similar to the above, and the weight ratio of each component is shown in Table 1, except that epoxy acrylic resin (SETALUX-8503-SS-60, 100 g, commercially available from Allnex) is added to the formula.

[0091] Example 5 - Preparation of Comparative Example Base Component AR3

[0092] The preparation process and amount of the base material component A2 of the coating composition of the present invention are similar to the above, and the weight ratio of each component is shown in Table 1, except that the formula does not contain a multifunctional (meth)acrylate monomer and uses an equal amount of a polyurethane acrylic resin (Photomer 6008, commercially available from IGM)

[0093] Example 6 - Preparation of Comparative Example Base Component AR4

[0094] The preparation process and dosage of the base material component A2 of the coating composition of the present invention are similar to the above, and the weight ratio of each component is shown in Table 1, except that polyurethane acrylic resin (Photomer 6008, 50 g, commercially available from IGM) is added to the formula.

[0095] Example 7 - Preparation of Comparative Example Base Component AR5

[0096] The preparation process and dosage of the base component A2 of the coating composition of the present invention are similar to those described above, and the weight ratios of the components are shown in Table 1. The difference is that the dosage of 1,6-hexanediol diacrylate is increased in the formula, while the dosage of hydrogenated bisphenol A epoxy resin is reduced.

[0097] Table 1: Base material composition formula

[0098]

[0099]

[0100] Preparation of curing system component B

[0101] Curing system components B1 and B2 according to embodiments of the present disclosure were prepared. The ingredients and amounts of each curing system are given in Table 2. The ingredients were weighed into a 0.5 liter container, sealed and placed on a shaker for 5 minutes under nitrogen protection to provide curing systems 1, 2 and comparative curing system 3.

[0102] Curing system B1 was prepared by mixing trialkoxy functional aminosilane (KH-550, 68 g, KH-540, 27 g, commercially available from Jiangsu Chenguang) with a metal catalyst (TYZOR TNBT TITANATE, 5 g, commercially available from DORF KETAL CHEMICALS).

[0103] Curing system B2 was prepared by mixing trialkoxy functional aminosilane (KH-550, 65.15 g, KH-540, 27.97 g, commercially available from Jiangsu Chenguang) with a metal catalyst (FASCAT 4200, 6.88 g, commercially available from PMC ORGANOMETALLIX INC.).

[0104] Table 2: Curing system formula

[0105]

[0106]

[0107] Coating formulation

[0108] The coating base component and the curing system component as shown in Table 1 and Table 2, respectively, were used, wherein the coating composition was prepared by mixing the two in a weight ratio: the base component and the curing system component were weighed into a container and stirred with a metal spatula until well mixed to provide a coating composition.

[0109] For coating formulation 1, base material A1 (87 g) was combined with curing system B1 (13 g) with a stoichiometric ratio of base material to curing agent of 1:1.03.

[0110] For coating formulation 2, base A2 (86 g) was combined with curing system B1 (14 g) with a stoichiometric ratio of base to curing agent of 1:0.92.

[0111] For coating formulation 3, base AR1 (86 g) was combined with curing system B1 (13 g) with a stoichiometric ratio of base to curing agent of 1:0.90.

[0112] For coating formulation 4, base AR2 (86 g) was combined with curing system B1 (14 g) with a stoichiometric ratio of base to curing agent of 1:0.90.

[0113] For coating formulation 5, base AR3 (91 g) was combined with curing system B1 (9 g) in a stoichiometric ratio of base to curing agent of 1:0.91.

[0114] For coating formulation 6, base AR4 (86.5 g) was combined with curing system B1 (13.5 g) with a stoichiometric ratio of base to curing agent of 1:0.92.

[0115] For coating formulation 7, base A2 (86 g) was combined with curing system B2 (14 g) with a stoichiometric ratio of base to curing agent of 1:0.92.

[0116] For coating formulation 8, base AR5 (83 g) was combined with curing system B1 (17 g) with a stoichiometric ratio of base to curing agent of 1:0.84.

[0117] Performance Testing

[0118] The resulting polysiloxane coating mixture was drawn down onto a glass strip using a drawdown with a 150 μm opening, and the coating was tested for drying (ASTM D1640).

[0119] use The obtained siloxane coating composition was sprayed onto an aluminum plate with a spray gun, and the coating was allowed to fully cure at room temperature. The coating was tested for flexibility (conical mandrel, ASTM D522) and weather resistance (xenon lamp artificial accelerated aging, ISO 4892-2). The specimen was dried at 23.3°C / 50%RH for 14 days when testing flexibility.

[0120] The gloss change at 60 degrees (ISO 2813) was also measured at the beginning, 10 weeks, and 20 weeks of artificial accelerated weathering.

[0121] The obtained polysiloxane coating composition was applied to a glass plate, and the coating was allowed to completely cure at room temperature, and the abrasion resistance of the coating was tested (ASTM D 4060, CS17 wheel, load 1 KG, abrasion resistance 1000 revolutions).

[0122] The obtained polysiloxane coating composition was applied to a sandblasted Sa2.5 steel plate coated with 60 microns of epoxy zinc-rich primer and 140 microns of epoxy intermediate paint, and the coating was completely cured at room temperature (23°C). The 7-day chemical resistance (ISO 2812-4) and 3000-hour salt spray resistance (ASTM B117) of the coating were tested, and the blistering (ASTM D714), rusting (ASTM D1654), and rust spread at the scribe line (ASTM D1654) of the test plate surface were evaluated. In ASTM D 714, the numbers 10, 8, 6, 4, 2, and 0 are used to represent the size of the blistering (10 (or none) means no blistering, and the smaller the number, the larger the blistering), and the letters D, MD, M, and F are used to represent the frequency of blistering (Dense, Medium dense, Medium, Few). The test results are given in Table 3.

[0123] This data demonstrates that silicone coating compositions made in accordance with the present disclosure exhibit improved flexibility as measured by tapered mandrel elongation, and possess excellent weathering, abrasion, and chemical resistance, as compared to comparative prior art compositions.

[0124] Table 3: Coated Panel Test Results

[0125]

[0126]

[0127] In addition, for coating formulation 8, the 60-degree gloss after being drawn down on the glass plate was only 55, which was changed from high gloss to semi-gloss compared with the others, so other performance tests were not continued.

[0128] Although specific embodiments of the present invention have been described above for illustrative purposes, it will be appreciated by those skilled in the art that changes may be made to the various embodiments described herein without departing from the broad inventive concept thereof. Therefore, it should be understood that this specification is not limited to the specific embodiments disclosed, but is intended to cover changes within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A polysiloxane-based coating composition comprising: A polysiloxane having the following formula I: wherein each R1 is hydroxy or an alkyl, aryl, or alkoxy group having up to 6 carbon atoms, each R2 is independently hydrogen or an alkyl or aryl group having up to 6 carbon atoms, and wherein n is selected so that the molecular weight of the polysiloxane is 400-10,000; Non-aromatic epoxide resins having greater than one 1,2-epoxy group / molecule and an epoxy equivalent weight of 100-5000; 2-8 wt % of a multifunctional (meth)acrylate monomer, based on the total weight of the coating composition, which is hexanediol di(meth)acrylate; and A curing system comprising at least one alkoxy-functional aminosilane.

2. The coating composition of claim 1, wherein the non-aromatic epoxide resin is a non-aromatic hydrogenated epoxy resin.

3. The coating composition of claim 2, wherein the non-aromatic epoxide resin is a diglycidyl ether of a non-aromatic hydrogenated cyclohexanedimethanol and a hydrogenated bisphenol A type epoxide resin.

4. The coating composition according to any one of the preceding claims 1 to 3, wherein the at least one alkoxy-functional aminosilane comprises at least one dialkoxy-functional aminosilane and / or at least one trialkoxy-functional aminosilane.

5. The coating composition according to any one of the preceding claims 1 to 3, wherein at least 80% by weight of the curing system consists of alkoxy-functional aminosilanes.

6. The coating composition of claim 5, wherein at least 90% by weight of the cure system consists of alkoxy-functional aminosilanes.

7. The coating composition of claim 5, wherein at least 95% by weight of the cure system consists of alkoxy functional aminosilanes.

8. The coating composition of claim 5, wherein 100% by weight of the cure system consists of alkoxy functional aminosilane.

9. The coating composition of claim 5, wherein the alkoxy-functional aminosilane is a trialkoxy-functional aminosilane.

10. The coating composition of claim 4, wherein the trialkoxy-functional aminosilane comprises aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminopropyltripropoxysilane, aminoneohexyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, N-β-aminoethyl-γ-aminopropyltriethoxysilane, N-phenylaminopropyltrimethoxysilane, trimethoxysilylpropyldiethylenetriamine, 3-(3-aminophenoxy)propyltrimethoxysilane, aminoethylaminomethylphenyltrimethoxysilane, 2-aminoethyl-3-aminopropyl-tri-2-ethylhexyloxysilane, N-aminohexylaminopropyltrimethoxysilane, and / or 3-aminopropyltris(methoxyethoxy)silane.

11. The coating composition of any one of claims 1 to 3, wherein the coating composition comprises, based on the total weight of the coating composition, 12 to 65 wt% of the polysiloxane having Formula I; 8 to 30 wt% of the non-aromatic epoxide resin; 2 to 8 wt% of the multifunctional (meth)acrylate monomer; and 5 to 40 wt% of the curing system in an amount sufficient to provide a ratio of amine equivalents to the sum of epoxy equivalents and double bond equivalents in the multifunctional (meth)acrylate monomer of 0.7:1.0 to 1.3:1.0 in the coating composition.

12. The coating composition according to claim 11, wherein a ratio of amine equivalent to the sum of epoxy equivalent and double bond equivalent in the multifunctional (meth)acrylate monomer of 0.8:1.0 to 1.2:1.0 is provided in the coating composition.

13. The coating composition according to claim 11, wherein a ratio of amine equivalent to the sum of epoxy equivalent and double bond equivalent in the multifunctional (meth)acrylate monomer of 0.9:1.0 to 1.1:1.0 is provided in the coating composition.

14. The coating composition according to any one of claims 1 to 3, further comprising up to 15 wt% of a curing accelerator based on the total weight of the coating composition; and / or up to 15 wt% of a flexible epoxy resin based on glycidyl ether of castor oil having an epoxy equivalent of 200-1000.

15. The coating composition according to any one of the preceding claims 1 to 3, wherein the coating composition does not contain epoxy (meth)acrylate and polyurethane (meth)acrylate.

16. A multi-component coating composition based on polysiloxane, comprising at least a base component A, which comprises a polysiloxane of formula I according to claim 1, a non-aromatic epoxide resin and a multifunctional (meth)acrylate monomer; and a component B, which comprises a curing system according to claim 1.

17. The multi-component coating composition of claim 16, wherein the ratio of the binder component A to the curing system component B is such as to provide a ratio of amine equivalents to the sum of epoxy equivalents and double bond equivalents in the multifunctional (meth)acrylate monomer of 0.7:1.0 to 1.3:1.0 in the coating composition.

18. The multi-component coating composition of claim 16, wherein the ratio of binder component A and curing system component B is such as to provide a ratio of amine equivalents to the sum of epoxy equivalents and double bond equivalents in the multifunctional (meth)acrylate monomer of 0.8:1.0 to 1.2:1.0 in the coating composition.

19. The multi-component coating composition of claim 16, wherein the ratio of binder component A and curing system component B is such as to provide a ratio of amine equivalents to the sum of epoxy equivalents and double bond equivalents in the multifunctional (meth)acrylate monomer of 0.9:1.0 to 1.1:1.0 in the coating composition.

20. A method of coating a surface with a coating composition, the method comprising: Providing a base component, the base component comprising a polysiloxane of formula I according to claim 1, a non-aromatic epoxide resin and a multifunctional (meth)acrylate monomer, adding the curing system according to claim 1 to the binder component to form a fully cured coating composition; and applying the coating composition to the surface of the substrate to be protected before the coating composition becomes fully cured, The method protects the substrate surface from one or more of the undesirable effects of chemicals, corrosion and weathering.

21. A coated substrate, wherein the substrate comprises at least one surface coated with the coating composition according to claim 1 or coated with the method according to claim 20.

22. The substrate of claim 21, wherein the substrate is selected from the group consisting of wood, plastic, concrete, glass and metal.

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