Two-component coating composition and application thereof

Abstract

The invention provides a two-component coating composition and application thereof, and relates to the technical field of coatings. The ketimine resin is adopted as matrix resin in the component A of the two-component coating composition, so that a coating with relatively good comprehensive performance can be obtained, and the coating has moderate mechanical strength and drawing adhesive force. The nano heat-insulating filler is further added into the two-component coating composition, so that the shielding and isolating effects of the coating on ultraviolet rays and infrared rays can be improved. The double-component coating composition disclosed by the invention can be used as a protective coating of automotive glass.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings and relates to a two-component coating composition and application thereof. Background Art

[0002] After the production of automobile glass, it is usually necessary to coat it with a layer of protective film, which can not only protect the glass from being scratched, but also be able to be peeled off relatively smoothly. Therefore, the protective film is required to have good mechanical strength and adhesion, and the peeling strength cannot be too high, otherwise it will be difficult to peel off. The materials of existing automobile glass protective films are mainly polyethylene terephthalate PET, polyurethane elastomer TPU, etc., but the yellowing resistance of PET film is poor, and more organic solvents will remain, so it is generally used as an inner film. TPU film can be used as an outer film, but its transparency is relatively poor and the transmission haze is high, which will affect the vision of people in the car.

[0003] There are two main ways to attach protective films: direct attachment of prefabricated films and coating spraying. For the coating spraying method, water-based polyurethane coatings are now more commonly used, but water-based polyurethane coatings have problems such as slow drying, insufficient mechanical strength, and poor water resistance. Hindered secondary amine aspartame has the characteristics of high solid content and moderate curing speed, but it also has shortcomings such as low mechanical properties such as tensile strength and tear strength or too high peel strength, which makes it impossible to peel off the protective film as a whole, affecting the use effect.

[0004] Chinese patent CN118909525A discloses a sprayable liquid car cover film composition for forming a car cover film on a car body, using a combination of imide resin and polyaspartic acid ester resin as the main resin, and isocyanate curing agent, the formed car cover film has the characteristics of high mechanical strength and moderate adhesion. However, the car cover film is mainly applied to the car body, and the car body is a paint coating, and the surface tension is much lower than that of glass. When the car cover film is applied to the glass, the peeling strength will be significantly increased, resulting in the film layer being difficult to peel off. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a two-component coating composition and application thereof.

[0006] The technical solution of the present invention is as follows:

[0007] A two-component coating composition, consisting of component A and component B;

[0008] The A component comprises a ketimine resin;

[0009] The number of ketimine groups in the structure of the ketimine resin is not less than 2, and the ketimine resin is selected from at least one of aliphatic ketimine, alicyclic ketimine, polyester-modified ketimine, polyether-modified ketimine and polysiloxane-modified ketimine;

[0010] The B component is an isocyanate curing agent.

[0011] Preferably, the structure of the ketimine is as shown in the following formula (1):

[0012] R 1 R 2 C=NR 3 NC=R 1 R 2 (1)

[0013] Among them, R 1 and R 2 independently selected from C1-C6 alkyl, R 3 Selected from C5-C6 cycloalkylene or C6-C20 substituted cycloalkylene;

[0014] or, R 3 Selected from a first polysiloxane structure, a first polyester structure or a first polyether structure.

[0015] More preferably, the structure of the first polysiloxane structure is as shown in the following formula (2):

[0016] -SiMe2 (OSiMe2) a (OSiMeR 4 ) b OSiMe2-(2)

[0017] Among them, R 4 Selected from C1-C24 alkyl, F-substituted C3-C12 alkyl or C6-C12 aromatic organic group, Me is methyl, a≥0, b≥0, 5≤a+b≤50.

[0018] Preferably, the ketimine resin comprises polysiloxane-modified ketimine and further comprises at least one of alicyclic ketimine and polyester-modified ketimine;

[0019] The weight proportion of the ketimine resin in the component A is not less than 80%.

[0020] More preferably, the weight ratio of the polysiloxane-modified ketimine to the alicyclic ketimine is 5:95-50:50.

[0021] Preferably, the component A further comprises at least one of a dispersant, a leveling agent, a wetting agent, a defoaming agent, a UV absorber, a UV stabilizer, an anti-yellowing agent, a solvent and a nano thermal insulation filler.

[0022] More preferably, the weight proportion of the nano thermal insulation filler in the component A is 0.2-2%. Preferably, the surface of the nano thermal insulation coating is modified with organic groups.

[0023] Preferably, the NCO content of the isocyanate curing agent is 10-20wt%, and the isocyanate curing agent is selected from at least one of an isocyanate trimer, a diisocyanate compound and an isocyanate prepolymer;

[0024] The NCO content of the isocyanate prepolymer is 2-10 wt %, and the isocyanate prepolymer contains at least one of a second polysiloxane structure, a second polyester structure and a second polyether structure.

[0025] More preferably, the average number of NCO groups in the isocyanate prepolymer structure is 2-3.

[0026] An application of the two-component coating composition described in any one of the above embodiments is used as a protective coating and / or heat-insulating coating for glass.

[0027] The beneficial effects of the present invention are:

[0028] (1) The coating composition of the present invention uses ketimine resin as the main resin. After the coating composition is sprayed on the glass, it contacts the water vapor in the air, and the ketimine resin is rapidly hydrolyzed to generate primary amino groups. The primary amino groups and the isocyanate curing agent rapidly undergo a cross-linking reaction, so the curing rate of the protective coating is moderate. The polyurea coating obtained by the reaction of the primary amino groups with the isocyanate curing agent has high mechanical strength, moderate adhesion and peel strength and other properties.

[0029] (2) Further adding nano thermal insulation fillers to the coating composition of the present invention can improve the thermal insulation performance of the coating. Further surface modification of the nano thermal insulation fillers can improve the dispersibility of the nano thermal insulation fillers in component A and the stability in the coating, which is beneficial to improving the performance of the thermal insulation coating. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further illustrated and described below through specific implementation methods. On the one hand, the present invention provides a two-component coating composition, consisting of component A and component B;

[0031] Component A comprises a ketimine resin;

[0032] The number of ketimine groups in the structure of the ketimine resin is not less than 2, and the ketimine resin is selected from at least one of aliphatic ketimine, alicyclic ketimine, polyester-modified ketimine, polyether-modified ketimine and polysiloxane-modified ketimine;

[0033] Component B is an isocyanate curing agent.

[0034] In view of the problems existing in the prior art of using polyurethane or aspartame as the main resin of the glass protective coating, the present invention uses ketimine resin as the main resin. In the coating state, the ketimine resin is stable and will not react with the isocyanate curing agent. After the coating composition is sprayed onto the surface of glass or other substrates, it comes into contact with moisture in the air. The reaction rate of ketimine with moisture is faster than the reaction rate of isocyanate with moisture. Ketimine reacts quickly with moisture and releases primary amino groups. The released primary amino groups have very high reactivity with isocyanate groups, can react quickly and cross-link to form a film, and obtain a film layer with high mechanical strength and moderate adhesion and peel strength.

[0035] In some embodiments, the structure of ketimine is shown in Formula (1),

[0036] R 1 R 2 C=NR 3 NC=R 1 R 2 (1)

[0037] Among them, R 1 and R 2 independently selected from C1-C6 alkyl, R 3 Selected from C5-C6 cycloalkylene or C6-C20 substituted cycloalkylene;

[0038] or, R 3 Selected from a first polysiloxane structure, a first polyester structure or a first polyether structure.

[0039] Ketimine can be obtained by reacting a primary amino compound with an organic ketone compound, is sensitive to moisture, and can be rapidly hydrolyzed in moisture to release a primary amino group. In the present invention, the curing rate of the coating composition is moderate through three steps, the first step is that the coating composition absorbs moisture, the second step is that the ketimine reacts with the absorbed moisture to release a primary amino group, and the third step is that the primary amino group reacts with an isocyanate. For example, the alicyclic ketimine shown in the above formula (1) can be obtained by the corresponding ketone R 1 R 2 C=O (such as acetone, methyl ethyl ketone, etc.) and alicyclic diamine NH2R 3 NH2 (such as 1,4-phenylenediamine, 4,4'-diaminodicyclohexylmethane, isophoronediamine, etc.) is reacted to obtain. Similarly, for polyether-modified ketimine, polyester-modified ketimine, and polysiloxane-modified ketimine, they can also be obtained by reacting the corresponding ketones (such as acetone, methyl ethyl ketone, etc.) with double-terminal primary amino polyether, double-terminal primary amino polyester, and double-terminal primary amino polysiloxane.

[0040] In some embodiments, the first polysiloxane structure has a structure as shown in Formula (2),

[0041] -SiMe2 (OSiMe2) a (OSiMeR 4 ) b OSiMe2-(2)

[0042] Among them, R 4 Selected from C1-C24 alkyl, F-substituted C3-C12 alkyl or C6-C12 aromatic organic group, Me is methyl, a≥0, b≥0, 5≤a+b≤50.

[0043] The above polysiloxane-modified ketimine can be prepared from the corresponding ketone R 1 R 2 It is obtained by reacting C=O (such as acetone, methyl ethyl ketone, etc.) with a double-terminal primary amino polysiloxane. The structure of the double-terminal primary amino polysiloxane can be NH2R 5 SiMe2 (OSiMe2) a (OSiMeR 4 ) b OSiMe2R 5 NH2, where R 5 It can be a C2-C6 alkylene or a substituted alkylene. The preparation method of the above-mentioned double-terminal primary amino polysiloxane is well known to those skilled in the art. For example, the double-terminal amino disiloxane NH2R 5 Me2SiOSiMe2R 5 NH2 is used as a capping agent to react with siloxane rings (such as octamethylcyclotetrasiloxane D4, tetramethyltetraphenylcyclotetrasiloxane D4) under alkaline catalysts (such as tetramethylammonium hydroxide siloxane alcohol, commonly known as "ammonium glue"). Ph , Trimethyl tris(trifluoropropyl)cyclotrisiloxane D3 F When the first polysiloxane structure contains F substituted C3-C12 alkyl, such as the structure of F(CF2) y CH2CH2-, where y = 1-9, can provide the coating with lower surface energy and hydrophobic properties.

[0044] In some embodiments, the ketimine resin comprises polysiloxane-modified ketimine, and further comprises at least one of alicyclic ketimine and polyester-modified ketimine, that is, the ketimine resin comprises a combination of polysiloxane-modified ketimine and alicyclic ketimine, a combination of polysiloxane-modified ketimine and polyester-modified ketimine, or a combination of polysiloxane-modified ketimine, alicyclic ketimine and polyester-modified ketimine. Alicyclic ketimine and / or polyester-modified ketimine can provide a higher mechanical strength for the film layer, and polysiloxane-modified ketimine can provide flexibility, high and low temperature resistance, hydrophobicity and other properties for the film layer, and due to its low surface performance characteristics, the peel strength of the film layer can be adjusted, and the higher the content of polysiloxane, the better the flexibility, high and low temperature resistance, hydrophobicity and other properties of the film layer, and the lower the peel strength.

[0045] The weight proportion of the ketimine resin in component A is not less than 80%. For example, the weight proportion may be 80%, 82%, 85%, 86%, 88%, 90%, 92%, 93%, 95%, etc. From the perspective of film-forming performance, it is preferred that the weight proportion of the ketimine resin in component A is not less than 85%, or more preferably, the weight proportion is not less than 90%.

[0046] In some embodiments, the weight ratio of polysiloxane-modified ketimine and alicyclic ketimine is 5:95-50:50. Polysiloxane-modified ketimine has good flexibility and low surface tension. If the usage ratio is high, it may lead to low mechanical strength of the protective film layer and low adhesion to the substrate. For example, the weight ratio of polysiloxane-modified ketimine and alicyclic ketimine can be any value of 5:95, 10:90, 15:85, 20:80, 25:75, 30:70, 35:65, 40:60, 45:55, 50:50, etc., without special restrictions. Further, the weight ratio can be 10:90-30:70.

[0047] In some embodiments, component A further comprises at least one of a dispersant, a leveling agent, a wetting agent, a defoamer, an ultraviolet absorber, an ultraviolet stabilizer, an anti-yellowing agent, a solvent and a nano thermal insulation filler. In the present invention, the dispersant is not particularly limited, and may be at least one of an anionic dispersant, a cationic dispersant, a nonionic dispersant, an amphoteric wetting dispersant, an electrically neutral wetting dispersant, a polymeric superdispersant, and a free radical superdispersant, such as BYK163, and the amount may be 0.1-2% by weight of component A; the leveling agent is not particularly limited, and may be polyacrylates, fluorocarbon-modified polyacrylates, polyether-modified silicones, etc., such as BYK354, BYK399, EFKA3600, etc., and the amount may be 0.1-0.6% by weight of component A; the wetting agent is not particularly limited, and may be polyether-modified silicones, such as Tego 4100, etc., the dosage can be 0.1-0.4% by weight of component A; there is no special restriction on the defoamer, which can be a polyether defoamer, a silicone defoamer, a polyether modified silicone defoamer, etc., such as BYK1790, BYK054, BYK052, etc., the dosage can be 0.3-1% by weight of component A; there is no special restriction on the ultraviolet absorber, such as UV292, the dosage can be 0.1-0.5% by weight of component A; there is no special restriction on the ultraviolet stabilizer, such as UV11 30, the dosage can be 0.1-0.5% of the weight of component A; the solvent is not particularly limited, and can be ethyl acetate, butyl acetate, ethylene glycol diacetate, propylene glycol methyl ether acetate, No. 100 solvent oil, No. 150 solvent oil, toluene, xylene, trimethylbenzene, etc., and the dosage can be selected according to needs, such as 3-10% of the weight of component A; the nano thermal insulation filler is not particularly limited, and can be nano titanium dioxide, nano silicon dioxide, nano ceramic powder, nano tungsten oxide, nano cesium tungsten oxide, etc. The nano thermal insulation filler can be provided in the form of a dispersion, and the concentration of the dispersion can be 10-40wt%, and the dispersion medium used can be an organic solvent such as xylene, ethylene glycol dimethyl ether, propylene glycol dimethyl ether, propylene glycol methyl ether acetate PMA, butyl acetate, etc.

[0048] If the amount of nano thermal insulation filler is too low, the thermal insulation effect will not be achieved or the thermal insulation effect will be poor. If the amount is too high, it will be detrimental to the light transmittance and mechanical strength of the protective film layer. In some embodiments, the weight proportion of nano thermal insulation filler in component A is 0.2-2%. For example, the weight proportion of nano thermal insulation filler in component A can be any value of 0.2%, 0.5%, 0.7%, 0.8%, 1%, 1.2%, 1.5%, 1.7%, 1.8%, 2%, etc., without special restrictions. Preferably, the surface of the nano thermal insulation coating is modified with an organic group.

[0049] In the present invention, in order to improve the compatibility and dispersibility of the nano thermal insulation filler in the coating composition, a surface treatment agent can be used to treat the nano thermal insulation filler and modify the organic group on the surface of the nano thermal insulation coating. Conventional surface treatment agents include silane coupling agents, such as methyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, β-aminoethyl-γ-aminopropyltrimethoxysilane, 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane, and 3-glycidyloxypropyltriethoxysilane. The surface treatment method is well known to those skilled in the art, such as dissolving the silane coupling agent in an organic solvent for hydrolysis, and then adding the nano thermal insulation filler to react. Furthermore, a ketimine-containing silane coupling agent can be used to treat the nano thermal insulation filler. For example, the structure of the ketimine-containing silane coupling agent can be shown in the following formula (3),

[0050] R 6 R 7 C=NR 8 SiMe x (OR 9 ) 3-x (3)

[0051] Among them, R 6 , R 7 and R 9 independently selected from C1-C6 alkyl, R 8 An organic structure selected from C1-C10 alkylene, C2-C16 substituted alkylene or C5-C12 cycloalkylene, Me is methyl, and x=0-1.

[0052] The nano thermal insulation filler is surface treated with a silane coupling agent containing ketimine. In the coating state, the ketimine does not react with the isocyanate group and has good compatibility with the ketimine resin, thereby improving the compatibility and dispersibility of the nano thermal insulation filler in the coating composition. After the coating composition is sprayed onto the glass surface, the ketimine is exposed to moisture to be hydrolyzed and releases primary amino groups, which react quickly with the isocyanate group. Therefore, the nano thermal insulation filler can also participate in the cross-linking reaction, thereby improving the dispersibility and dispersion stability of the nano thermal insulation filler in the coating combination and the cross-linking density of the coating, and further improving the mechanical strength of the coating. Better dispersibility can also improve the light transmittance of the film layer.

[0053] As mentioned above, the ketimine-containing silane coupling agent can be prepared from the corresponding primary amino silane coupling agent (NH2R 8 SiMe x (OR 9 ) 3-x ) and the corresponding ketone R 6 R 7 Obtained by C=O reaction.

[0054] In some embodiments, the NCO content of the isocyanate curing agent is 10-20 wt %, and the isocyanate curing agent is selected from at least one of an isocyanate trimer, a diisocyanate compound, and an isocyanate prepolymer;

[0055] The NCO content of the isocyanate prepolymer is 2-10wt%, and the isocyanate prepolymer contains at least one of a second polysiloxane structure, a second polyester structure, and a second polyether structure. The isocyanate prepolymer with the above structure can further adjust the properties of the film layer, such as mechanical strength, adhesion, peel strength, etc.

[0056] In the present invention, the isocyanate prepolymer can be obtained by reacting the corresponding hydroxyalkyl-terminated polysiloxane, polyester polyol or polyether polyol with a polyisocyanate compound. The number of hydroxyl groups in the structures of hydroxyalkyl-terminated polysiloxane, polyester polyol and polyether polyol can be 2-3, and the number of NCO groups in the polyisocyanate compound can be 2-3, but the number of hydroxyl groups in the structures of hydroxyalkyl-terminated polysiloxane, polyester polyol and polyether polyol and the number of NCO groups in the polyisocyanate compound are preferably not 3 at the same time; for example, when the number of hydroxyl groups in the structures of hydroxyalkyl-terminated polysiloxane, polyester polyol and polyether polyol is 2, the number of NCO groups in the polyisocyanate compound can be 2-3, and when the number of hydroxyl groups in the structures of hydroxyalkyl-terminated polysiloxane, polyester polyol and polyether polyol is 2-3, the number of NCO groups in the polyisocyanate compound is 2. In the present invention, the hydroxyl groups of the hydroxyalkyl-terminated polysiloxane used to prepare the above-mentioned isocyanate prepolymer can be distributed at both ends of the polysiloxane (such as shown in the following formula (4)), or can be distributed at the same end of the polysiloxane (such as shown in the following formula (5)).

[0057] HOR 10 Me2SiO(SiOMe2) m (SiOMeR 11 ) n SiMe2R 10 OH(4)

[0058] Among them, R 10 is selected from C1-C6 alkylene, R 11 Selected from C1-C24 alkyl, m≥0, n≥0, 5≤m+n≤50;

[0059] Me3SiO(SiOMe2) p (SiOMeR 12 ) q SiMe2R 13 (R 14 OH)2 (5)

[0060] Among them, R12 is selected from C1-C24 alkyl, R 13 Selected from C1-C6 trivalent alkyl, R 14 Selected from C1-C6 alkylene, p≥0, q≥0, 5≤p+q≤50.

[0061] In particular, the cross-linked polysiloxane structure is located in the side chain, which has a high degree of freedom and can further improve the hydrophobicity of the film layer. The hydroxyalkyl-terminated polysiloxanes shown in the above formulas (4) and (5) can be directly obtained from the market, such as Silok 8822F2, 8816, 8826, 8814, 8815, etc. of Guangzhou Silok New Materials Co., Ltd.

[0062] There is no particular limitation on the polyester polyol, which may be conventional polyester polyol, polycarbonate polyol, polycaprolactone polyol, etc. The hydroxyl value may be between 55-250 mgKOH / g and it may be liquid or waxy at room temperature.

[0063] In some embodiments, the average number of NCO groups in the isocyanate prepolymer structure is 2-3.

[0064] On the other hand, the present invention also provides an application of the two-component coating composition described in any of the above embodiments, which is used as a protective coating and / or thermal insulation coating for glass. The two-component coating composition of the present invention is particularly suitable for the protection of automobile glass, and has the characteristics of high mechanical strength and moderate peeling strength; when nano thermal insulation fillers are further added to the coating composition, it can be used as a thermal insulation protective coating for automobile glass.

[0065] In the present invention, the weight ratio of component A to component B is not particularly limited, and can be 1:1-2 according to the molar ratio of ketimine groups in component A to NCO groups in component B, or 2-4:1 according to the weight ratio of component A to component B.

[0066] The technical scheme of the present invention is further described and illustrated below according to various preparation examples, embodiments and comparative examples. Unless otherwise specified, the parts described in the following preparation examples, embodiments and comparative examples are parts by weight.

[0067] Preparation Example 1-5 Preparation of Ketimine Resin

[0068] Preparation Example 1

[0069] Add 0.25 mol of double-terminated amino polysiloxane NH2(CH2)3SiMe2(OSiMe2) into the reaction vessel 22.7 OSiMe2(CH2)3NH2 and 0.75 mol of methyl isobutyl ketone were heated to 120°C and refluxed with water for 18 hours, and then low boiling points were removed to obtain ketimine resin 1.

[0070] Preparation Example 2

[0071] Add 0.25 mol of double-terminated amino polysiloxane NH2(CH2)3SiMe2(OSiMe2) into the reaction vessel 45.1 OSiMe2(CH2)3NH2 and 0.8 mol of methyl ethyl ketone were heated to 100°C and refluxed with water for 24 hours, and then low-boiling substances were removed to obtain ketimine resin 2.

[0072] Preparation Example 3

[0073] Add 0.25 mol of double-terminated amino polyfluorosiloxane NH2(CH2)3SiMe2(OSiMe2) into the reaction vessel. 18.6 (OSiMeR f ) 15.3 OSiMe2(CH2)3NH2(R f F(CF2)4CH2CH2-) and 1 mol of methyl ethyl ketone, heated to 100°C and refluxed with water for 24 hours, and then low-boiling substances were removed to obtain ketimine resin 3.

[0074] Preparation Example 4

[0075] 0.25 mol of 4,4'-diaminodicyclohexylmethane and 0.9 mol of methyl ethyl ketone were added to a reaction container, and the temperature was raised to 100° C. and refluxed with water for 15 hours, and then low-boiling substances were removed to obtain ketimine resin 4.

[0076] Preparation Example 5

[0077] 0.25 mol of double-terminated amino polycaprolactone (Mn=850) and 1 mol of methyl ethyl ketone were added to a reaction container, the temperature was raised to 100° C. and refluxed with water for reaction for 22 hours, and then low-boiling substances were removed to obtain ketimine resin 5.

[0078] Preparation Example 6-8 Preparation of isocyanate prepolymer

[0079] Preparation Example 6

[0080] 100.8 g HDI and 175 g Silok 8815 (Mn=1750) were added to a reaction vessel, and the mixture was reacted at 70° C. for 3 hours until the NCO content reached the theoretical value. The mixture was transferred to molecular distillation for de-lightening at a temperature of 130° C. and a vacuum degree of <10 Pa. After de-lightening, isocyanate prepolymer 1 was obtained, and the NCO content was measured to be 6.2 wt%.

[0081] Preparation Example 7

[0082] 100.8 g HDI and 140 g Silok 8822F2 (Mn=1400) were added to the reaction container, and the mixture was reacted at 70° C. for 3 hours until the NCO content reached the theoretical value. The mixture was transferred to molecular distillation for de-lightening at a temperature of 130° C. and a vacuum degree of <10 Pa. After de-lightening, isocyanate prepolymer 2 was obtained, and the NCO content was measured to be 6.7 wt%.

[0083] Preparation Example 8

[0084] 100.8 g HDI and 53 g polycaprolactone polyol (Mn=530) were added to the reaction vessel, and the mixture was reacted at 70° C. for 3 hours until the NCO content reached the theoretical value. The mixture was then transferred to molecular distillation for decarbonization at a temperature of 130° C. and a vacuum degree of <10 pa. After decarbonization, isocyanate prepolymer 3 was obtained, and the NCO content was measured to be 8.6 wt%.

[0085] Example 1

[0086] The two-component coating composition consists of component A and component B in a ratio of the molar number of ketimine in component A to the molar number of NCO in component B of 1:1.5.

[0087] Component A, 100% by weight, consisted of 90.2% of ketimine resin 4 of Preparation Example 4, 0.3% BYK163, 0.5% BYK354, 0.6% BYK054, 0.2% UV292, 0.2% UV1130 and 8% butyl acetate.

[0088] Component B is composed of HDI trimer and isocyanate prepolymer 3 of Preparation Example 8, and the NCO content of component B is 15.7 wt%.

[0089] Example 2

[0090] The difference between this embodiment and embodiment 1 is that in embodiment 1, the ketimine resin 4 of preparation example 4 is replaced by a mixed ketimine resin composed of the ketimine resin 1 of preparation example 1 and the ketimine resin 4 of preparation example 4 in an equal weight percentage and a weight ratio of 1:9. The remaining steps remain unchanged.

[0091] Example 3

[0092] The difference between this embodiment and embodiment 2 is that in embodiment 2, the weight ratio of ketimine resin 1 to ketimine resin 4 is adjusted to 5:95. The remaining steps remain unchanged.

[0093] Example 4

[0094] The difference between this embodiment and embodiment 2 is that in embodiment 2, the weight ratio of ketimine resin 1 to ketimine resin 4 is adjusted to 3:7. The remaining steps remain unchanged.

[0095] Example 5

[0096] The difference between this embodiment and embodiment 2 is that in embodiment 2, the weight ratio of ketimine resin 1 to ketimine resin 4 is adjusted to 5:5. The remaining steps remain unchanged.

[0097] Example 6

[0098] The difference between this example and Example 1 is that in Example 1, the ketimine resin 4 of Preparation Example 4 is replaced by the ketimine resin 1 of Preparation Example 1 with the same weight ratio. The other steps remain unchanged.

[0099] Comparative Example 1

[0100] The difference between this comparative example and Example 1 is that in Example 1, the ketimine resin 4 of Preparation Example 4 is replaced by F420 resin of Feiyang Junyan Company in an equal weight proportion. The remaining steps remain unchanged.

[0101] Comparative Example 2

[0102] The difference between this comparative example and Example 1 is that in Example 1, the ketimine resin 4 of Preparation Example 4 is replaced by a mixed resin composed of F420 resin of Feiyang Junyan Company and the ketimine resin 4 of Preparation Example 4 in a weight ratio of 7:3. The remaining steps remain unchanged.

[0103] Comparative Example 3

[0104] The difference between this comparative example and Example 1 is that in Example 1, the ketimine resin 4 of Preparation Example 4 is replaced by a mixed resin composed of F420 resin of Feiyang Junyan Company and the ketimine resin 1 of Preparation Example 1 in a weight ratio of 7:3. The remaining steps remain unchanged.

[0105] Example 7

[0106] The difference between this example and Example 2 is that in Example 2, the ketimine resin 1 of Preparation Example 1 is replaced by the ketimine resin 2 of Preparation Example 2 in an equal weight ratio. The remaining steps remain unchanged.

[0107] Example 8

[0108] The difference between this embodiment and embodiment 2 is that in embodiment 2, the ketimine resin 1 of preparation example 1 is replaced by the ketimine resin 3 of preparation example 3 with the same weight ratio. The other steps remain unchanged.

[0109] Example 9

[0110] The difference between this embodiment and embodiment 2 is that in embodiment 2, the ketimine resin 4 of preparation example 4 is replaced by the ketimine resin 5 of preparation example 5 with the same weight ratio. The other steps remain unchanged.

[0111] Example 10

[0112] The difference between this example and Example 1 is that in Example 1, the isocyanate prepolymer 3 of Preparation Example 8 is replaced by the isocyanate prepolymer 1 of Preparation Example 6, and the NCO content of component B remains unchanged. The remaining steps remain unchanged.

[0113] Embodiment 11

[0114] The difference between this example and Example 1 is that in Example 1, the isocyanate prepolymer 3 of Preparation Example 8 is replaced by the isocyanate prepolymer 2 of Preparation Example 7, and the NCO content of component B remains unchanged. The remaining steps remain unchanged.

[0115] Performance test: After component A and component B are mixed evenly, the coating is placed in an environment of 25±2℃ and 60-65% humidity for 48 hours before testing.

[0116] The tensile strength and tear strength were tested according to the method of GB / T 16777-2008; the pull-off adhesion was tested according to the method of ISO4624, the substrate was automobile glass, the surface was clean, and the coating thickness was 100 μm; the water contact angle was tested using a contact angle tester. The results are shown in Table 1 below.

[0117] Table 1

[0118]

[0119] Therefore, it can be seen from the data results in Table 1 that the two-component coating composition of the present invention has good comprehensive properties after curing, including moderate tensile strength (tensile strength is basically above 20 MPa, which is relatively high), tear strength and pull-out adhesion (pull-out adhesion is basically between 4 and 5 N / cm 2 , which is relatively moderate), and after the introduction of polysiloxane chain segments, the pull-off adhesion of the coating can be adjusted, and the coating has a higher water contact angle and better waterproof performance. At the same time, the polysiloxane chain segments can also bring better weather resistance, high and low temperature resistance and other properties to the coating.

[0120] Example 12

[0121] The two-component coating composition consists of component A and component B in a ratio of the molar number of ketimine in component A to the molar number of NCO in component B of 1:1.6.

[0122] Component A, based on 100% by weight, consists of 93.6% of a mixed ketimine resin (composed of ketimine resin 1 of Preparation Example 1 and ketimine resin 4 of Preparation Example 4 in a weight ratio of 1:5), 0.2% BYK163, 0.4% BYK354, 0.6% BYK054, 0.1% UV292, 0.1% UV1130 and 5% butyl acetate.

[0123] Component B is composed of HDI trimer and isocyanate prepolymer 3 of Preparation Example 8, and the NCO content of component B is 18.1 wt%.

[0124] Example 13

[0125] The difference between this embodiment and embodiment 12 is that in embodiment 12, 0.8% by weight of nano thermal insulation filler GATO solution (25 wt% PMA solution) of component A is added, and the weight content of the mixed ketimine resin is reduced accordingly. The remaining steps remain unchanged.

[0126] Embodiment 14

[0127] The difference between this embodiment and embodiment 13 is that in embodiment 13, the weight percentage of GATO solution is adjusted from 0.8% to 4%, and the weight content of the mixed ketimine resin is reduced accordingly. The remaining steps remain unchanged.

[0128] Embodiment 15

[0129] The difference between this embodiment and embodiment 13 is that in embodiment 13, the weight percentage of GATO solution is adjusted from 0.8% to 8%, and the weight content of the mixed ketimine resin is reduced accordingly. The remaining steps remain unchanged.

[0130] Example 16

[0131] The difference between this embodiment and embodiment 14 is that in embodiment 14, the GATO solution with a weight percentage of 4% is replaced by the nano thermal insulation filler GATO with a weight percentage of 1% treated with methyltrimethoxysilane. The remaining steps remain unchanged.

[0132] Embodiment 17

[0133] The difference between this embodiment and embodiment 14 is that in embodiment 14, the GATO solution with a weight percentage of 4% is replaced by a nano thermal insulation filler GATO with a weight percentage of 1% surface treated with a ketimine silane coupling agent (CH3)2C=N(CH2)3Si(OCH3)3. The remaining steps remain unchanged.

[0134] Performance test: tensile strength is tested according to the method of GB / T 16777-2008; light transmittance is tested according to the method of GB / T2410-2008; ultraviolet shielding rate and infrared blocking rate are tested according to the method of GA / T 744-2013. The results are shown in Table 2 below.

[0135] Table 2

[0136]

[0137] Therefore, it can be seen from the data results in Table 2 that the addition of nano thermal insulation fillers to the two-component coating composition of the present invention can improve the shielding and barrier properties against ultraviolet and infrared rays, and when the surface of the nano thermal insulation coating is treated, the mechanical strength can be further improved, especially after treatment with a ketimine silane coupling agent, the effect of improving the mechanical strength is more obvious.

[0138] As described above, the basic principles, main features and advantages of the present invention are shown and described. Those skilled in the art should understand that the present invention is not limited by the above embodiments, which are only preferred embodiments of the present invention and cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the scope of the present invention and the content of the specification should still be within the scope of the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents.

Claims

1. A two-component coating composition, characterized in that: It is composed of component A and component B; The A component comprises a ketimine resin; The number of ketimine groups in the structure of the ketimine resin is not less than 2, and the ketimine resin is selected from at least one of aliphatic ketimine, alicyclic ketimine, polyester-modified ketimine, polyether-modified ketimine and polysiloxane-modified ketimine; The B component is an isocyanate curing agent.

2. The two-component coating composition according to claim 1, characterized in that The structure of the ketimine is shown in the following formula (1): R 1 R 2 C=NR 3 NC=R 1 R 2 (1) Among them, R 1 and R 2 independently selected from C1-C6 alkyl, R 3 Selected from C5-C6 cycloalkylene or C6-C20 substituted cycloalkylene; or, R 3 Selected from a first polysiloxane structure, a first polyester structure or a first polyether structure.

3. The two-component coating composition according to claim 2, characterized in that: The structure of the first polysiloxane structure is shown in the following formula (2): -SiMe2(OSiMe2) a (OSiMeR 4 ) b OSiMe2-(2) Among them, R 4 Selected from C1-C24 alkyl, F-substituted C3-C12 alkyl or C6-C12 aromatic organic group, Me is methyl, a≥0, b≥0, 5≤a+b≤50.

4. The two-component coating composition according to claim 1, characterized in that The ketimine resin comprises polysiloxane-modified ketimine and further comprises at least one of alicyclic ketimine and polyester-modified ketimine; The weight proportion of the ketimine resin in the component A is not less than 80%.

5. The two-component coating composition according to claim 4, characterized in that: The weight ratio of the polysiloxane-modified ketimine to the alicyclic ketimine is 5:95-50:

50.

6. The two-component coating composition according to claim 1, characterized in that: The component A further comprises at least one of a dispersant, a leveling agent, a wetting agent, a defoaming agent, an ultraviolet absorber, an ultraviolet stabilizer, an anti-yellowing agent, a solvent and a nano thermal insulation filler.

7. The two-component coating composition according to claim 6, characterized in that: The weight proportion of the nano thermal insulation filler in the component A is 0.2-2%. Preferably, the surface of the nano thermal insulation coating is modified with organic groups.

8. The two-component coating composition according to claim 1, characterized in that: The NCO content of the isocyanate curing agent is 10-20wt%, and the isocyanate curing agent is selected from at least one of an isocyanate trimer, a diisocyanate compound and an isocyanate prepolymer; The NCO content of the isocyanate prepolymer is 2-10 wt %, and the isocyanate prepolymer contains at least one of a second polysiloxane structure, a second polyester structure and a second polyether structure.

9. The two-component coating composition according to claim 8, characterized in that The average number of NCO groups in the isocyanate prepolymer structure is 2-3.

10. Use of the two-component coating composition according to any one of claims 1 to 9, characterized in that: Used as protective coating and / or thermal insulation coating for glass.

Images