TW202000802A - Water repellent coating - Google Patents

Abstract

Provided is an UV-moisture dual-curing, water repellent coating composition comprising an acrylate monomer, an isocyanate (meth) acrylate, a fluorine-containing acrylate additive and a solvent. Further provided are a method of coating a substrate comprising with the UV-moisture dual-curing, water repellent coating composition, and the substrate therewith.

Description

Waterproof coating

The invention relates to a dual-cure waterproof coating composition, in particular to a dual-cure UV and moisture waterproof coating composition. The invention also relates to a method for coating a substrate with the coating composition and a substrate coated with the coating composition.

Electronic products that fall into the water without any protection are usually scrapped, causing losses to users. In order to avoid this loss, it is usually necessary to add IPX6 waterproof function to electronic products, which needs to be achieved through electronic waterproof coating technology.

The existing electronic waterproof coating technology mainly has the following two types:

One is to use vapor deposition technology to form the coating, such as HZO's Parylene and P2i's PECVD technology using fluoroacrylate. The disadvantage of this type of technology is the use of vapor deposition technology, high equipment and process costs, and low output.

The second is to selectively apply a solution-type waterproof coating through masking technology, in which the coating is applied by dipping, spraying, brushing, etc. This type of coating has low cost, high output, and is widely used. However, due to the current trend of miniaturization of electronic equipment, the structure of electronic components is becoming more and more sophisticated. When certain areas or components need to be selectively protected, other areas or components must be shielded. This process of shielding and de-shielding is usually extremely large. Affect production efficiency.

In order to improve production efficiency, when trying to use a coating process that does not use masking, precision selective dispensing is usually selected. When using this process, the viscosity of the coating will greatly affect the construction speed of precision dispensing. If the viscosity is too high, it will affect the dispensing speed, which will limit the speed of the dispensing equipment; if the viscosity is too low, it will cause the coating to continue to flow after being applied to the component, affecting other components.

The purpose of the present invention is to develop a dual-cure waterproof coating composition with suitable viscosity, which is suitable for rapid selective coating using precision dispensing equipment.

Another object of the present invention is to add fluorine-containing additives to the dual-curing waterproof coating formulation to improve the hydrophobic/waterproof performance of the coating.

The present invention provides a coating composition comprising about 20-60 wt% acrylate monomer, 20-60 wt% isocyanate (meth)acrylate, 0.5-5 wt based on the total weight of the coating composition % Fluorine-containing acrylate additives and 10-30 wt% solvent.

The present invention also provides a method of coating a substrate, which includes applying the coating composition to the substrate through a dispensing process. The present invention also provides a coated substrate including a substrate; and a coating layer coated on at least a portion of the substrate, the coating layer comprising 20-60 wt% based on the total weight of the coating composition A coating composition of acrylate monomer, 20-60 wt% isocyanate (meth)acrylate, 0.5-5 wt% fluorine-containing acrylate additive and 10-30 wt% solvent is formed.

For the purposes of the following detailed description, it should be understood that the invention may employ various alternative changes and order of steps unless explicitly stated to the contrary. Furthermore, all numbers expressing the amounts of ingredients used in the specification and claims, for example, except in any operation examples, or where otherwise indicated, should be understood as being modified by the term "about" in all cases. Therefore, unless stated to the contrary, the numerical parameters set forth in the following description and appended claims are approximate values that vary according to the desired performance to be obtained by the present invention. At least it is not an attempt to limit the application of the principle of equivalence to the scope of the claims, and each numerical parameter should be at least interpreted by applying ordinary rounding techniques based on the number of significant digits reported.

Although the numerical ranges and parameters that illustrate the broad range of the invention are approximate values, the numerical values listed in the specific examples are reported as accurately as possible. However, any numerical value inherently contains certain errors necessarily resulting from the standard deviation found in their respective test measurements.

In addition, it should be understood that any numerical ranges described herein are intended to include all subranges subsumed therein. For example, the range of "1 to 10" is intended to include all subranges between (and including) the minimum value 1 and the maximum value 10, that is, having a minimum value equal to or greater than 1 and equal to or less than 10 The maximum value.

In this application, unless expressly stated otherwise, the use of the singular includes the plural and the plural includes the singular. In addition, in this application, unless expressly stated otherwise, the use of "or" means "and/or" even though "and/or" may be explicitly used in some cases. In addition, in this application, unless expressly stated otherwise, the use of "a" or "an" means "at least one". For example, "a" polymer, "a" coating composition, etc. refer to any one or more of any of these articles.

In one aspect of the present invention, an electronic waterproof coating composition dually cured by UV and moisture is provided. The composition includes an acrylate monomer, an isocyanate (meth)acrylate, a fluorine-containing acrylate additive, and a solvent.

The waterproof coating according to the present invention is applied to a substrate of an electronic product (including, for example, metal, plastic, and/or glass, etc.) by means of dispensing. As used herein, the term "dispensing coating" is a method of selectively coating specific areas on a substrate. Adopting the dispensing coating method requires that the composition product has a suitable viscosity, that is, the product will not block the dispensing equipment or limit the running speed of the dispensing equipment, but also enable the product to have a certain fluidity on the substrate but not As for the flow to areas where coating is not desired. The waterproof coating composition according to the present invention may have a viscosity of 15-100 cp, which is measured at 25° C. using a DV-C rotor viscometer manufactured by Brookfield Corporation.

As used herein, the term "dual curing of UV and moisture" refers to curing of the coating composition by UV radiation followed by moisture curing at room temperature. Moisture curing can be used as a supplement to UV curing, so that areas where UV curing is incomplete or lacks UV curing (for example, due to the limitation of the radiation arrangement) can achieve sufficient curing of the coating.

As used herein, the term "waterproof coating" refers to a coating composition that after curing forms a coating with a hydrophobic, impermeable effect. According to the internationally established IEC529 standard, the waterproof grade of the coating can be divided into 10 grades, with the increasing waterproof performance are IPX0, IPX1, IPX2...IPX9. Electronic products generally require a waterproof rating of IPX6 or higher, that is, direct water spray in any direction will not enter the interior. The waterproof coating according to the present invention forms a coating on a substrate (including, for example, metal, plastic, and/or glass, etc.) with a waterproof rating of at least IPX6, such as IPX7.

The waterproof coating according to the present invention is an environmentally friendly low VOC coating. As used herein, the term "VOC (volatile organic compound)" refers to any organic compound having a boiling point less than or equal to 250°C (482°F) at an atmospheric pressure of 101.3 kPa. The "low VOC" means that the VOC content of the coating composition is less than 420 g/L (23°C, normal pressure of 101.3 kPa). The VOC content of the waterproof coating according to the present invention is less than 420 g/L (calculated without water).

The acrylate monomer used in the coating composition of the present invention may include any acrylate monomer suitable for the present invention, provided that the acrylate monomer does not contain isocyanate and/or fluorine groups. Suitably, the number of carbon atoms of the acrylate monomer is between 1 and 20, for example, the number of carbon atoms is 4-10. In some embodiments, the acrylate monomer is a monofunctional (meth)acrylate. The monofunctional (meth)acrylate refers to containing one acrylate group in one monomer. Examples of acrylate monomers that can be used in the coating composition of the present invention include but are not limited to methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, (meth)acrylic acid-2 -Ethylhexyl ester, isobornyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, and any mixtures thereof.

In some embodiments, the acrylate monomer used in the present invention contains a urethane group. Suitably, the average number ratio of urethane groups contained in each monomer to acrylate groups contained is less than about 0.6.

Generally, based on the total weight of the coating composition, the coating composition according to the present invention contains at least about 20 wt%, suitably at least about 30 wt%, such as at least about 35 wt%, and at most about 60 wt%, suitable Up to about 50 wt%, for example up to about 45 wt% of acrylate monomer. For example, based on the total weight of the coating composition, the coating composition according to the invention contains 20-60 wt%, suitably 30-50 wt%, such as 35-45 wt% of acrylate monomers. When the amount of acrylate monomer is less than 20 wt%, the flexibility of the coating layer formed by the coating composition becomes poor. When the amount is higher than 60 wt%, the strength of the coating layer formed by the coating composition is insufficient, thereby affecting the protective performance.

The isocyanate (meth)acrylate used in the coating composition of the present invention may include any isocyanate (meth)acrylate suitable for the present invention. In some embodiments, the isocyanate (meth)acrylate is a monoisocyanate (meth)acrylate prepared from a diisocyanate and a hydroxyalkyl (meth)acrylate monomer at a molar ratio of 1:1. The monoisocyanate (meth)acrylates that can be used in the coating composition of the present invention are commercially available or can be prepared by techniques known in the art. The monoisocyanate (meth)acrylate used in the coating composition of the present invention may not contain a fluorine group.

For example, monoisocyanate (meth)acrylates that can be used in the coating composition of the present invention can be prepared by using diisocyanate and hydroxyalkyl (meth)acrylate monomers. Diisocyanates that can be used include, but are not limited to: toluene diisocyanate (TDI), ethyl diisocyanate, propyl diisocyanate, diphenylmethane diisocyanate (DMI), 1,5-naphthalene diisocyanate (NDI), benzene diisocyanate Methylene diisocyanate (XDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), hydrogenated DMI, hydrogenated XDI, oligomeric HDI (such as dimer, trimer, etc.), Oligomeric IPDI (such as dimers, trimers, etc.), naphthalene diisocyanate, other oligocyanates, and any combination thereof. Hydroxyalkyl (meth)acrylates that can be used include, but are not limited to, 2-hydroxyethyl acrylate, 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl ( Meth)acrylate and any combination thereof.

Examples of monoisocyanate (meth)acrylates that can be used in the coating composition of the present invention may include, for example, but not limited to: isocyanate ethyl acrylate and isocyanate ethyl methacrylate of karenz company.

Generally, based on the total weight of the coating composition, the coating composition according to the present invention contains at least about 20 wt%, suitably at least about 30 wt%, such as at least about 35 wt%, and at most about 60 wt%, suitable Up to about 50 wt%, for example up to about 45 wt% of isocyanate (meth)acrylate. For example, based on the total weight of the coating composition, the coating composition according to the invention contains 20-60 wt%, suitably 30-50 wt%, such as 35-45 wt% of isocyanate (meth)acrylate. When the amount of isocyanate (meth)acrylate is less than 20 wt%, the water resistance of the coating layer formed by the coating composition decreases. When the content is higher than 60 wt%, the flexibility of the coating layer formed by the coating composition becomes poor.

The coating composition of the present invention may further include a photoinitiator. The photoinitiator can be cleaved by light irradiation to generate free radicals, thereby initiating a photopolymerization reaction. Useful photoinitiators include, but are not limited to, benzoin derivatives, benzoyl ketal derivatives, dialkoxyacetophenones, α-hydroxyalkyl ketones, α-aminoalkyl ketones, acetylphosphines Hydrides, esterified oxime ketone compounds, aryl peroxyester compounds, halogenated methyl aryl ketones, organic sulfur compounds, benzoates, etc. According to need, two or more different photoinitiators can be selected. Based on the total weight of the coating composition, the initiator may comprise about 1-10 wt%, such as about 3-6 wt%.

Many commercially available photoinitiators can be used in the present invention. Examples of photoinitiators that can be used in the present invention include, but are not limited to: trade names IRGACURE 184, 127, 2959, 500, TPO, 2100, 819, 907, 369, 1300, 651 and DAROCUR 1173, MBF from BASF , 4265, BP photoinitiator; the photoinitiator of JRCure BP under the trade name of Juri Chemical, and any combination thereof.

The coating composition of the present invention may further include a moisture curing catalyst. The moisture curing catalyst can accelerate the reaction of isocyanate groups with hydroxyl groups and water (in air). Examples of moisture curing catalysts that can be used in the present invention include, but are not limited to: dibutyltin dilaurate, dioctyltin dilaurate, monobutyltin oxide, chloromonobutylstannic acid, dibutyltin acetate, male Dibutyltin acid, stannous octoate, organic bismuth, and any combination thereof. Based on the total weight of the coating composition, the moisture curing catalyst may constitute 0.1-1 wt%, such as 0.2-0.5 wt%.

The acrylate-based fluorine-containing additive used in the coating composition of the present invention can increase the hydrophobicity of the coating. The acrylate-based fluorine-containing additive of the present invention imparts a hydrophobic effect to the substrate coated with the coating composition of the present invention, and can be dissolved in solvents such as esters, ethers, and ketones. The fluorine-containing acrylate additive that can be used in the present invention may include at least one fluorine-containing alkyl alcohol (meth)acrylate, (meth)acrylic acid perfluoropolyether alcohol ester, and any combination thereof. The fluorine-containing acrylate additive used in the coating composition of the present invention may be free of isocyanate groups. Suitably, the fluorine-containing alkyl alcohol (meth)acrylates that can be used in the present invention may include perfluorobutylethyl (meth)acrylate, perfluorohexylethyl (meth)acrylate, perfluorooctyl Ethyl (meth)acrylate and any combination thereof. For example, (meth)acrylic acid perfluoropolyether alcohol esters that can be used in the present invention may include K-type, Y-type, M-type, D-type, and Z-type perfluoropolyether alcohol acrylates.

Examples of commercially available fluorine-containing acrylate additives for the present invention may include, but are not limited to, Daikin Corporation's DCP-HP; Shin-Etsu Corporation's KY-1203; DIC Corporation's KS75, KS95; Solvay Corporation's Fluorolink AD1700, MD700 , And any combination of them.

The fluorine-containing acrylate additive is present in the coating composition in an amount of about 0.1-5 wt%, for example about 0.5-2 wt%, based on the total weight of the coating composition.

The solvent used in the coating composition of the present invention may include a solvent containing no hydroxyl group such as esters and ketones. The fluorine-containing acrylate additives as described above are generally not compatible with the system (UV resin system) in the present invention. Therefore, it is necessary to introduce a solvent while introducing the fluorine-containing acrylate additive to improve the hydrophobic performance of the UV system. The solvent is intended to improve the compatibility of fluorine-containing acrylate additives, and affect the viscosity and application performance of the coating. Suitable solvents include, but are not limited to, methyl acetate, ethyl acetate, butyl acetate, methyl ethyl ketone, and mixtures of any two or more of the above. The solvent is present in the coating composition in an amount of 10-30 wt%, such as 15-25 wt%, based on the weight of the coating composition.

In some embodiments, the weight ratio of solvent to fluorine-containing acrylate additive suitable for the present invention is about 8-30, suitably 10-20, such as 10-15.

The viscosity of the coating composition according to the present invention may be about 15-100 cP, such as 30-80 cP (measured at 25°C with a DV-C rotor viscometer manufactured by Brookfield Corporation). Within this viscosity range, the coating composition can be applied using a sophisticated selective dispensing process without using masking, thereby improving production efficiency.

The coating composition of the present invention can be applied to substrates of various electronic devices and components, and the substrates may include metal or non-metal substrates, for example. Metal substrates include but are not limited to tin, steel (including electrogalvanized steel, cold rolled steel, hot dip galvanized steel, etc.), aluminum, aluminum alloy, zinc-aluminum alloy, zinc-aluminum alloy coated steel, and aluminized steel. Non-metallic substrates include glass, polymers and plastics, such as polyester, polyolefin, polyamide, cellulose, polystyrene, polyacrylic acid, polyethylene naphthalate, polypropylene, polyethylene, nylon, EVOH, polylactic acid, other "green" polymer substrates, polyethylene terephthalate (PET), polycarbonate, polycarbonate propylene butadiene styrene (PC/ABS), polyamide, etc. .

The substrate may also include a metalized plastic substrate. As used herein, "metallized plastic substrate" refers to a substrate formed of both plastic and metal. For example, the metallized plastic substrate may include a plastic material that includes a metal material incorporated into the plastic material and/or coated on at least a portion of the plastic material.

The coating composition is particularly useful when at least partially coated on consumer electronic products. For example, the coating composition of the present invention can be applied to motherboards and other electronic components of smart phones, tablet computers, notebook computers, and provide them with waterproof protection. Based on the above, the present invention also provides an electronic product or electronic component having a surface at least partially coated with the coating composition described herein. It should be understood that consumer electronics can be formed from any of the foregoing materials, such as metalized plastic.

The coating composition of the present invention can be applied by different methods such as spray coating, dip coating, roller coating, brush coating, and dispensing, and suitably, precision dispensing. For example, referring to FIG. 1, the coating composition of the present invention can be accurately (in any shape and area size) dispensed on a 9 cm*6 cm substrate (shaded areas are dispensed areas).

The coating composition of the present invention forms a coating layer after curing. After being completely cured, the coating composition of the present invention can form a coating having a film thickness of 1 micrometer to 100 micrometers, or 5 micrometers to 75 micrometers, or 25 micrometers to 50 micrometers.

The following numbered articles summarize some aspects of the invention:

1. A coating composition comprising about 20-60 wt% acrylate monomer, 20-60 wt% isocyanate (meth)acrylate, 0.5-5 wt% based on the total weight of the coating composition Fluorine-containing acrylate additives and 10-30 wt% solvent.

2. The coating composition according to clause 1, which has a viscosity in the range of 15-100 cP suitable for the dispensing process.

3. The coating composition according to clause 1 or 2, wherein the acrylate monomer comprises a monofunctional (meth)acrylate having 14 to 2010 carbon atoms in the ester chain.

4. The coating composition according to Clause 3, wherein the acrylate monomer includes methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, (meth)acrylic acid- 2-ethylhexyl ester, isobornyl (meth)acrylate, and/or tetrahydrofurfuryl (meth)acrylate and/or any mixture thereof.

5. The coating composition according to any of the preceding clauses, wherein the acrylate monomer contains urethane groups.

6. The coating composition according to any one of the preceding clauses, wherein the isocyanate (meth)acrylate is a monomer prepared from a diisocyanate and a hydroxyalkyl (meth)acrylate monomer in a molar ratio of 1:1 Isocyanate (meth)acrylate.

7. The coating composition according to Clause 6, wherein the diisocyanate includes toluene diisocyanate (TDI), ethyl diisocyanate, propyl diisocyanate, diphenylmethane diisocyanate (DMI), 1,5-naphthalene Diisocyanate (NDI), xylylene diisocyanate (XDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), hydrogenated DMI, hydrogenated XDI, oligomeric HDI, oligomeric IPDI , And/or naphthalene diisocyanate and/or any combination thereof.

8. The coating composition according to Clause 6 or 7, wherein the hydroxyalkyl (meth)acrylate monomer includes 2-hydroxyethyl acrylate, 2-hydroxyethyl (meth)acrylate, 3 -Hydroxypropyl acrylate, and/or 3-hydroxypropyl (meth) acrylate and/or any combination thereof.

9. The coating composition according to any one of the preceding clauses, wherein the fluorine-containing acrylate additive comprises a fluorine-containing alkyl alcohol (meth)acrylate and/or (meth)acrylic acid perfluoropolyether alcohol ester And/or any combination thereof.

10. The coating composition according to any one of the preceding clauses, wherein the solvent includes ester and/or ketone solvents that do not contain hydroxyl groups.

11. The coating composition according to any one of the preceding clauses, wherein the weight ratio of the solvent to the fluorine-containing acrylate additive is about 8-30.

12. The coating composition according to any one of the preceding clauses, further comprising a moisture curing catalyst and a photoinitiator.

13. A method of coating a substrate, comprising applying the coating composition of any of clauses 1 to 12 to the substrate through a dispensing process.

14. The method of clause 13, wherein the substrate comprises a plastic substrate, a metal substrate, and/or glass.

15. A coated substrate, comprising: (a) a substrate; (b) a coating applied on at least a portion of the substrate, the coating comprising 20% based on the total weight of the coating composition A coating composition of -60 wt% acrylate monomer, 20-60 wt% isocyanate (meth)acrylate, 0.5-5 wt% fluorine-containing acrylate additive and 10-30 wt% solvent is formed.

16. The coated substrate of clause 15, wherein the substrate includes a plastic substrate, a metal substrate, and/or glass.

17. The coated substrate of clause 15 or 16, wherein the substrate is coated by the method of clause 13 or 14. Examples

The following examples are provided to further illustrate the invention, but it should not be construed as limiting the invention to the details described in the examples. Unless otherwise stated, all parts and percentages in the following examples and throughout the specification are by weight.

表2. 塗料組合物比較例

A．異氰酸酯丙烯酸乙酯，購自karenz公司 B．甲基丙烯酸正丁酯，購自Sigma-aldrich公司 C. 全氟己基乙基(甲基)丙烯酸酯，購自Chemour公司 D. Fluorolink AD1700，購自Solvay公司 E．α-羥烷基苯酮光引發劑，購自Sigma-aldrich公司 F. 二月桂酸二丁基錫，購自Sigma-aldrich公司 G. 醋酸丁酯，購自Sigma-aldrich公司I. Preparation of coating composition Examples 1-6 and Comparative Examples 1-4 were prepared according to the components listed in Tables 1 and 2 and their contents. Table 1. Examples of coating compositions

Table 2. Comparative examples of coating compositions

A. Isocyanate ethyl acrylate, purchased from karenz company B. N-Butyl methacrylate, purchased from Sigma-aldrich Company C. Perfluorohexyl ethyl (meth) acrylate, purchased from Chemour Company D. Fluorolink AD1700, purchased from Solvay Company E. Alpha-hydroxyalkylphenone photoinitiator, purchased from Sigma-aldrich F. dibutyltin dilaurate, purchased from Sigma-aldrich G. butyl acetate, purchased from Sigma-aldrich

II. Coating preparation process Under the protection of a nitrogen atmosphere, add the different components of A-G to a 1L three-necked flask in sequence, and stir thoroughly to prepare a wet paint sample. The wet sample of the coating is coated on the glass by a dispensing process, and cured by UV for 1 minute (UV wavelength 365 nm, UV energy 800-1200 mJ/cm2). Then placed in the air at room temperature and cured by moisture for 2-3 days to obtain a coated substrate.

III. Performance Test The following performance tests were performed on the coating composition of the present invention and the substrate coated with the coating of the present invention, and the comparative coating composition and the coating formed therefrom. The results are shown in Table 3-4 below.

1. Compatibility test The compatibility of the coating is evaluated by visually inspecting the prepared coating composition for delamination or noticeable droplets. Excellent: Completely clear and transparent Good: Uniform, milky white turbidity, no delamination or droplets Poor: Delamination or obvious droplets -: Not evaluated

2. The viscosity of the viscosity coating is measured with a DV-C rotor viscometer at room temperature (for example, 25°C) (manufactured by Brookfield), and a suitable rotor (such as No. 3 rotor) is selected according to the viscosity of the sample to be measured. The coating composition is poured into the test container until the tapered surface of the rotor is fully inserted into the liquid. Turn on the motor and set the speed to 100 rpm, align the drum with the center, and read the data when the data is stable. Measure 2 times in succession and take the average value (the error does not exceed ±5% of the average value)

3. Flexibility of the coating Place a mandrel with a diameter of 0.3 cm on the iron plate coated with the coating composition, bend it 180 degrees within 1 second, and observe whether there are cracks under a 10x microscope.

4. Hydrophobicity The hydrophobicity of the coating is evaluated by the static contact angle of water. A contact angle measuring device (manufactured by Bioscience) is used for the static contact angle of water. Use 1 microliter of water droplets on the surface of the coating to determine the size of the water droplet angle. The larger the measured angle, the better the hydrophobic performance.

5. Waterproof performance Waterproof performance is evaluated by the water vapor transmission rate of the coating. The coating was prepared into a 20-micron-thick film and tested on a W3-031 water vapor transmission rate tester (manufactured by Labthink) using a weight reduction method. The test conditions were 38°C and 90% relative humidity. The lower the water vapor transmission rate, the better the waterproof performance of the coating.

表4. 比較例性能測試結果

可見本發明實施例1-6的塗料組合物的施工效率、相容性、防水疏水性能和柔韌性均好於對比實例1-4的產品。通過添加適當的含氟丙烯酸酯添加劑和特定的溶劑使得實施例1-6的產品具有良好的相容性以及改善的疏水性。同時，根據本發明的實施例所採用的樹脂體系(即，丙烯酸酯單體和異氰酸酯(甲基)丙烯酸酯)與含氟丙烯酸酯添加劑的特定組合，以及組分之間的用量平衡賦予了塗層適宜的黏度和優異的防水性能等。 儘管已解釋和描述了本發明的特定方面，對本領域技術人員來說很明顯的是可做出多種其它改變和修飾而不會背離本發明的精神和範圍。因此所附權利要求意圖涵蓋落入本發明範圍內的所有這些改變和修飾。6. Dispensing speed The dispensing speed is evaluated by the time it takes to complete dispensing within the set area (shaded part) as shown in Figure 1. Dispensing equipment is manufactured by Nordson, and the valve models are SC-280 and S400. Table 3. Example performance test results

Table 4. Comparative example performance test results

It can be seen that the construction efficiency, compatibility, waterproof and hydrophobic properties and flexibility of the coating compositions of Examples 1-6 of the present invention are better than those of Comparative Examples 1-4. By adding appropriate fluorine-containing acrylate additives and specific solvents, the products of Examples 1-6 have good compatibility and improved hydrophobicity. At the same time, the specific combination of resin systems (ie, acrylate monomers and isocyanate (meth)acrylates) and fluorine-containing acrylate additives used in the examples of the present invention, as well as the balance of amounts between the components, give the coating Suitable viscosity of the layer and excellent waterproof performance. Although specific aspects of the invention have been explained and described, it will be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. The appended claims are therefore intended to cover all such changes and modifications falling within the scope of the invention.

Figure 1 Schematic diagram of the dispensing area on the substrate (shaded part)

Claims (16)

A coating composition comprising about 20-60 wt% acrylate monomer, 20-60 wt% isocyanate (meth)acrylate, 0.5-5 wt% fluorine-containing based on the total weight of the coating composition Acrylate additives and 10-30 wt% solvent. The coating composition as described in item 1 of the patent application range, which has a viscosity in the range of 15-100 cP. The coating composition according to item 1 or item 2 of the patent application range, wherein the acrylate monomer includes a monofunctional (meth)acrylate having 1 to 20 carbon atoms. The coating composition according to item 3 of the patent application scope, wherein the acrylate monomers include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, (meth) 2-ethylhexyl acrylate, isobornyl (meth)acrylate, and/or tetrahydrofurfuryl (meth)acrylate. The coating composition according to item 1 or 2 of the patent application scope, wherein the acrylate monomer contains a urethane group. The coating composition according to item 1 or item 2 of the patent application scope, wherein the isocyanate (meth)acrylate is composed of diisocyanate and hydroxyalkyl (meth)acrylate monomer in a molar ratio of 1:1 The prepared monoisocyanate (meth)acrylate. The coating composition according to item 6 of the patent application scope, wherein the diisocyanate includes toluene diisocyanate (TDI), ethyl diisocyanate, propyl diisocyanate, diphenylmethane diisocyanate (DMI), 1,5 -Naphthalene diisocyanate (NDI), xylylene diisocyanate (XDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), hydrogenated DMI, hydrogenated XDI, oligomeric HDI, low Poly IPDI, and/or naphthalene diisocyanate. The coating composition according to item 6 of the patent application scope, wherein the hydroxyalkyl (meth)acrylate monomers include 2-hydroxyethyl acrylate, 2-hydroxyethyl (meth)acrylate, 3 -Hydroxypropyl acrylate, and/or 3-hydroxypropyl (meth) acrylate. The coating composition according to item 1 or item 2 of the patent application scope, wherein the fluorine-containing acrylate additive includes a fluorine-containing alkyl alcohol (meth)acrylate and/or (meth)acrylic perfluoropolyether Alcohol ester. The coating composition according to item 1 or item 2 of the patent application scope, wherein the solvent includes ester and/or ketone solvents that do not contain hydroxyl groups. The coating composition according to item 1 or item 2 of the patent application range, wherein the weight ratio of the solvent to the fluorine-containing acrylate additive is about 8-30. The coating composition as described in item 1 or 2 of the patent application scope, which further comprises a moisture curing catalyst and a photoinitiator. A method for coating a substrate, comprising applying the coating composition according to any one of claims 1 to 12 to the substrate through a dispensing process. The method according to item 13 of the patent application scope, wherein the substrate includes a plastic substrate, a metal substrate, and/or glass. A coated substrate, comprising: (a) a substrate; (b) a coating applied on at least a portion of the substrate, the coating consisting of 20-60 based on the total weight of the coating composition A coating composition of wt% acrylate monomer, 20-60 wt% isocyanate (meth)acrylate, 0.5-5 wt% fluorine-containing acrylate additive and 10-30 wt% solvent is formed. The coated substrate according to item 15 of the patent application scope, wherein the substrate includes a plastic substrate, a metal substrate, and/or glass.

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