Anti-condensation coating material, and preparation method and application thereof

Abstract

The present application relates to the technical field of paint, and proposes a kind of anti-condensation paint and its preparation method and application, anti-condensation paint includes the following weight parts components: polyurethane acrylate 40~60 parts, methyl MQ silicone resin 20~35 parts, hydroxyl-terminated polydimethylsiloxane 2~10 parts, dolomite powder 20~35 parts, defoaming agent 1~3 parts, dispersing agent 1~3 parts, silane coupling agent 2~6 parts, organic solvent 40~50 parts.Through the above technical scheme, the problem of poor anti-condensation effect and poor mechanical property of anti-condensation paint in related technology is solved.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to an anti-condensation coating, its preparation method, and its application. Background Technology

[0002] When the surface temperature of a building or other object is lower than the dew point temperature of the surrounding air, moisture on the surface easily condenses into dew, resulting in condensation. Prolonged or repeated condensation can lead to bacterial and fungal contamination of buildings and other objects, and can even cause equipment to rust or be damaged. Therefore, preventing or reducing condensation is extremely important for the protection of buildings and easily rusted equipment.

[0003] Anti-condensation coatings are special types of coatings used to prevent condensation from forming on the surfaces of buildings or other objects under conditions of high humidity and large temperature differences. Traditional anti-condensation coatings typically use hydrophilic materials, but long-term, large-scale water absorption can lead to saturation of their adsorption capacity, reducing their anti-condensation performance and affecting their mechanical properties. Therefore, developing an anti-condensation coating with both good anti-condensation effect and good mechanical properties is of great significance for the promotion and application of anti-condensation coatings. Summary of the Invention

[0004] This invention proposes an anti-condensation coating, its preparation method, and its application, which solves the problems of poor anti-condensation effect and poor mechanical properties of anti-condensation coatings in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] This invention provides an anti-condensation coating, comprising the following components in parts by weight:

[0007] 40-60 parts of polyurethane acrylate, 20-35 parts of methyl MQ silicone resin, 2-10 parts of hydroxyl-terminated polydimethylsiloxane, 20-35 parts of dolomite powder, 1-3 parts of defoamer, 1-3 parts of dispersant, 2-6 parts of silane coupling agent, and 40-50 parts of organic solvent.

[0008] As a further technical solution, the weight ratio of the methylMQ silicone resin and the hydroxyl-terminated polydimethylsiloxane is 3~8:1.

[0009] When the weight ratio of methyl MQ silicone resin to hydroxyl-terminated polydimethylsiloxane is 3~8:1, the anti-condensation effect and mechanical properties of the anti-condensation coating can be improved.

[0010] As a further technical solution, the dolomite powder is modified dolomite powder.

[0011] As a further technical solution, the raw materials for the modified dolomite powder include dolomite powder, nano-silica, and hydroxypropyl methylcellulose phthalate.

[0012] Dolomite powder was surface-modified using nano-silica and hydroxypropyl methylcellulose phthalate. Nano-silica not only fills the gaps in the dolomite powder but also interacts with hydroxypropyl methylcellulose phthalate; conversely, hydroxypropyl methylcellulose phthalate also interacts with the dolomite powder. This modification of dolomite powder with these two substances further improves the anti-condensation effect and mechanical properties of anti-condensation coatings.

[0013] As a further technical solution, the preparation method of the modified dolomite powder includes the following steps:

[0014] A1. Mix the dolomite powder and the nano-silica, then grind them to obtain ground dolomite powder.

[0015] A2. Dissolve the hydroxypropyl methylcellulose phthalate in ethanol to obtain a hydroxypropyl methylcellulose phthalate solution;

[0016] A3. Add the ground dolomite powder to the hydroxypropyl methylcellulose phthalate solution, stir, and concentrate to obtain the modified dolomite powder.

[0017] As a further technical solution, the weight ratio of the dolomite powder, nano-silica, and hydroxypropyl methylcellulose phthalate is 8~13:1:1.

[0018] When the weight ratio of dolomite powder, nano-silica, and hydroxypropyl methylcellulose phthalate is 8~13:1:1, the anti-condensation effect and mechanical properties of the anti-condensation coating can be further improved.

[0019] As a further technical solution, in step A3, the temperature during stirring is 55~65℃.

[0020] As a further technical solution, in step A2, the mass fraction of the hydroxypropyl methylcellulose phthalate solution is 5%~12%.

[0021] As a further technical solution, the defoamer is one or more of mineral oil defoamers, fatty acid defoamers, and organosilicon defoamers; the dispersant is one or more of polyvinyl alcohol, fatty acid salts, and alkylphenol salts; the silane coupling agent is one or more of vinyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, and 3-glycidyl etheroxypropylmethyldiethoxysilane; and the organic solvent is one of ethyl acetate, butyl acetate, cyclohexanone, toluene, and xylene.

[0022] This invention also proposes a method for preparing an anti-condensation coating, comprising the following steps:

[0023] S1. Except for the silane coupling agent and dolomite powder, mix the remaining components according to the weight parts, stir, and obtain a mixed solution;

[0024] S2. The silane coupling agent and the dolomite powder are added to the mixed solution in the specified weight proportions and stirred to obtain an anti-condensation coating.

[0025] As a further technical solution, in step S1, the stirring time is 2-3 hours; in step S2, the stirring time is 0.5-1 hour.

[0026] The present invention also proposes the application of the anti-condensation coating or the anti-condensation coating prepared by the preparation method described above in preventing condensation on surfaces.

[0027] The working principle and beneficial effects of this invention are as follows:

[0028] In this invention, the anti-condensation coating comprises methyl MQ silicone resin and hydroxyl-terminated polydimethylsiloxane. Both methyl MQ silicone resin and hydroxyl-terminated polydimethylsiloxane contain siloxane segments and have similar structures. The combined use of methyl MQ silicone resin and hydroxyl-terminated polydimethylsiloxane enhances their interaction and strengthens the bonding between the hydroxyl-terminated polydimethylsiloxane and the polyurethane acrylate, thereby improving the anti-condensation effect and mechanical properties of the anti-condensation coating. Furthermore, the addition of dolomite powder also improves the anti-condensation effect and mechanical properties of the anti-condensation coating. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] In the following examples and comparative examples, the polyurethane acrylate is model PUA901; the methyl MQ silicone resin is model IOTA with an M:Q ratio of 0.7; the hydroxyl-terminated polydimethylsiloxane has a viscosity of 1500; the dolomite powder has a particle size of 325 mesh; the defoamer is propylene glycol fatty acid ester; the dispersant is polyvinyl alcohol, model 2699; the silane coupling agent is γ-methacryloyloxypropyltrimethoxysilane; the nano silica has a particle size of 100 nm; and the hydroxypropyl methylcellulose phthalate is model HPMCP.

[0031] Example 1

[0032] An anti-condensation coating comprises the following components in parts by weight:

[0033] 40 parts polyurethane acrylate, 20 parts methyl MQ silicone resin, 2 parts hydroxyl-terminated polydimethylsiloxane, 20 parts dolomite powder, 1 part propylene glycol fatty acid ester, 1 part polyvinyl alcohol, 2 parts γ-methacryloyloxypropyltrimethoxysilane, 40 parts cyclohexanone.

[0034] Its preparation method includes the following steps:

[0035] S1. Except for the silane coupling agent and dolomite powder, mix the remaining components according to the weight parts and stir for 2 hours to obtain a mixed solution.

[0036] S2. Add the silane coupling agent and dolomite powder to the mixed solution according to the weight ratio and stir for 0.5 h to obtain the anti-condensation coating.

[0037] Example 2

[0038] An anti-condensation coating comprises the following components in parts by weight:

[0039] 50 parts polyurethane acrylate, 33 parts methyl MQ silicone resin, 3 parts hydroxyl-terminated polydimethylsiloxane, 30 parts dolomite powder, 2 parts propylene glycol fatty acid ester, 2 parts polyvinyl alcohol, 4 parts γ-methacryloyloxypropyltrimethoxysilane, 45 parts cyclohexanone.

[0040] Its preparation method includes the following steps:

[0041] S1. Except for the silane coupling agent and dolomite powder, mix the remaining components according to the weight parts and stir for 2.5 hours to obtain a mixed solution.

[0042] S2. Add the silane coupling agent and dolomite powder to the mixed solution according to the weight parts and stir for 0.75 h to obtain the anti-condensation coating.

[0043] Example 3

[0044] An anti-condensation coating comprises the following components in parts by weight:

[0045] 60 parts polyurethane acrylate, 35 parts methyl MQ silicone resin, 10 parts hydroxyl-terminated polydimethylsiloxane, 35 parts dolomite powder, 3 parts propylene glycol fatty acid ester, 3 parts polyvinyl alcohol, 6 parts γ-methacryloyloxypropyltrimethoxysilane, and 50 parts cyclohexanone.

[0046] Its preparation method includes the following steps:

[0047] S1. Except for the silane coupling agent and dolomite powder, mix the remaining components according to the weight parts and stir for 3 hours to obtain a mixed solution.

[0048] S2. Add the silane coupling agent and dolomite powder to the mixed solution according to the weight parts and stir for 1 hour to obtain the anti-condensation coating.

[0049] Example 4

[0050] The only difference between this embodiment and Embodiment 2 is that 24 parts of methyl MQ silicone resin and 12 parts of hydroxyl-terminated polydimethylsiloxane were added.

[0051] Example 5

[0052] The only difference between this embodiment and Embodiment 2 is that 27 parts of methyl MQ silicone resin and 9 parts of hydroxyl-terminated polydimethylsiloxane were added.

[0053] Example 6

[0054] The only difference between this embodiment and Embodiment 2 is that the amount of methyl MQ silicone resin added is 32 parts, and the amount of hydroxyl-terminated polydimethylsiloxane added is 4 parts.

[0055] Example 7

[0056] The only difference between this embodiment and embodiment 6 is that the dolomite powder is nano-silica modified dolomite powder, and its raw materials include 22 parts dolomite powder and 8 parts nano-silica.

[0057] The preparation method of nano-silica modified dolomite powder includes the following steps: 22 parts of dolomite powder and 8 parts of nano-silica are mixed and then ground to obtain nano-silica modified dolomite powder.

[0058] Example 8

[0059] The only difference between this embodiment and Embodiment 6 is that the dolomite powder is hydroxypropyl methylcellulose phthalate modified dolomite powder, and its raw materials include 22 parts dolomite powder and 8 parts hydroxypropyl methylcellulose phthalate.

[0060] The preparation method of hydroxypropyl methylcellulose phthalate modified dolomite powder includes the following steps: dissolving 8 parts of hydroxypropyl methylcellulose phthalate in ethanol to obtain a 6% hydroxypropyl methylcellulose phthalate solution; adding 22 parts of dolomite powder to the 6% hydroxypropyl methylcellulose phthalate solution; stirring at 60°C; concentrating to obtain hydroxypropyl methylcellulose phthalate modified dolomite powder.

[0061] Example 9

[0062] The only difference between this embodiment and embodiment 6 is that the dolomite powder is modified dolomite powder, and its raw materials include 22 parts dolomite powder, 4 parts nano silica and 4 parts hydroxypropyl methylcellulose phthalate.

[0063] The preparation method of modified dolomite powder includes the following steps:

[0064] A1. Mix 22 parts of dolomite powder and 4 parts of nano silica, then grind them to obtain ground dolomite powder.

[0065] A2. Dissolve 4 parts of hydroxypropyl methylcellulose phthalate in ethanol to obtain a 6% (w / w) hydroxypropyl methylcellulose phthalate solution.

[0066] A3. Add the ground dolomite powder to a 6% (w / w) hydroxypropyl methylcellulose phthalate solution, stir at 60°C, and concentrate to obtain modified dolomite powder.

[0067] Example 10

[0068] The only difference between this embodiment and Embodiment 9 is that the raw materials for the modified dolomite powder include 28 parts dolomite powder, 1 part nano silica and 1 part hydroxypropyl methylcellulose phthalate.

[0069] Example 11

[0070] The only difference between this embodiment and Embodiment 9 is that the raw materials for the modified dolomite powder include 24 parts dolomite powder, 3 parts nano silica and 3 parts hydroxypropyl methylcellulose phthalate.

[0071] Example 12

[0072] The only difference between this embodiment and Embodiment 9 is that the raw materials for the modified dolomite powder include 26 parts dolomite powder, 2 parts nano silica and 2 parts hydroxypropyl methylcellulose phthalate.

[0073] Comparative Example 1

[0074] The only difference between this comparative example and Example 1 is that hydroxyl-terminated polydimethylsiloxane was not added, and 22 parts of methyl MQ silicone resin were added.

[0075] Comparative Example 2

[0076] The only difference between this comparative example and Example 1 is that methyl MQ silicone resin was not added, and 22 parts of hydroxyl-terminated polydimethylsiloxane were added.

[0077] Comparative Example 3

[0078] The only difference between this comparative example and Example 1 is that methyl MQ silicone resin and hydroxyl-terminated polydimethylsiloxane were not added, and the amount of polyurethane acrylate added was 62 parts.

[0079] Comparative Example 4

[0080] The only difference between this comparative example and Example 1 is that dolomite powder was not added.

[0081] The anti-condensation coatings prepared by the methods of Examples 1-12 and Comparative Examples 1-4 were coated on the surface of aluminum sheets. The aluminum sheets were placed in an oven at 120°C and heated and cured for 1 hour to form a film. The anti-condensation coating can form an anti-condensation coating on the surface of the aluminum sheets, thereby obtaining aluminum sheets with anti-condensation coatings. The water contact angle of the aluminum sheets with anti-condensation coatings was tested according to GB / T 30693-2014 "Measurement of the contact angle between plastic films and water".

[0082] The anti-condensation coatings prepared by the methods of Examples 1-12 and Comparative Examples 1-4 were prepared into films according to GB / T 19250-2013 "Polyurethane Waterproof Coatings" and subjected to tensile property testing; wherein the tensile speed was 500 mm / min.

[0083] The test results are shown in Table 1 below:

[0084] Table 1 Test Results

[0085]

[0086] Compared to Comparative Examples 1-3, the water contact angle and tensile strength of Example 1 were significantly increased, indicating that when the anti-condensation coating includes methyl MQ silicone resin and hydroxyl-terminated polydimethylsiloxane, the combined use of methyl MQ silicone resin and hydroxyl-terminated polydimethylsiloxane improves the anti-condensation effect and mechanical properties of the anti-condensation coating. Furthermore, compared to Comparative Example 4, the water contact angle and tensile strength of Example 1 were significantly increased, indicating that the addition of dolomite powder also improves the anti-condensation effect and mechanical properties of the anti-condensation coating.

[0087] Compared to Examples 2 and 4, the water contact angle and tensile strength of Examples 5-6 increased, indicating that when the weight ratio of methyl MQ silicone resin to hydroxyl-terminated polydimethylsiloxane is 3-8:1, the anti-condensation effect and mechanical properties of the anti-condensation coating can be improved. Compared to Example 6, the water contact angle and tensile strength of Examples 7-12 increased, indicating that when the dolomite powder is modified dolomite powder, the anti-condensation effect and mechanical properties of the anti-condensation coating can be further improved. Compared to Examples 7-8, the water contact angle and tensile strength of Examples 9-12 increased, indicating that when the raw materials of the modified dolomite powder include dolomite powder, nano-silica, and hydroxypropyl methylcellulose phthalate, the anti-condensation effect and mechanical properties of the anti-condensation coating can be further improved. In addition, compared with Examples 9-10, the water contact angle and tensile strength of Examples 11-12 increased, indicating that when the weight ratio of dolomite powder, nano silica and hydroxypropyl methylcellulose phthalate is 8-13:1:1, the anti-condensation effect and mechanical properties of the anti-condensation coating can be further improved.

[0088] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-condensation coating, characterized in that, Includes the following components in parts by weight: 40-60 parts of polyurethane acrylate, 20-35 parts of methyl MQ silicone resin, 2-10 parts of hydroxyl-terminated polydimethylsiloxane, 20-35 parts of dolomite powder, 1-3 parts of defoamer, 1-3 parts of dispersant, 2-6 parts of silane coupling agent, and 40-50 parts of organic solvent.

2. The anti-condensation coating according to claim 1, characterized in that, The weight ratio of the methylMQ silicone resin to the hydroxyl-terminated polydimethylsiloxane is 3~8:

1.

3. The anti-condensation coating according to claim 1, characterized in that, The dolomite powder is modified dolomite powder; the raw materials of the modified dolomite powder include dolomite powder, nano-silica and hydroxypropyl methylcellulose phthalate.

4. The anti-condensation coating according to claim 3, characterized in that, The preparation method of the modified dolomite powder includes the following steps: A1. Mix the dolomite powder and the nano-silica, then grind them to obtain ground dolomite powder. A2. Dissolve the hydroxypropyl methylcellulose phthalate in ethanol to obtain a hydroxypropyl methylcellulose phthalate solution; A3. Add the ground dolomite powder to the hydroxypropyl methylcellulose phthalate solution, stir, and concentrate to obtain the modified dolomite powder.

5. The anti-condensation coating according to claim 3, characterized in that, The weight ratio of the dolomite powder, nano-silica, and hydroxypropyl methylcellulose phthalate is 8~13:1:

1.

6. The anti-condensation coating according to claim 4, characterized in that, In step A3, the temperature during stirring is 55~65℃.

7. The anti-condensation coating according to claim 4, characterized in that, In step A2, the mass fraction of the hydroxypropyl methylcellulose phthalate solution is 5% to 12%.

8. The anti-condensation coating according to claim 1, characterized in that, The defoamer is one or more of mineral oil defoamers, fatty acid defoamers, and organosilicon defoamers; the dispersant is one or more of polyvinyl alcohol, fatty acid salts, and alkylphenol salts; the silane coupling agent is one or more of vinyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, and 3-glycidyl etheroxypropylmethyldiethoxysilane; and the organic solvent is one of ethyl acetate, butyl acetate, cyclohexanone, toluene, and xylene.

9. The method for preparing an anti-condensation coating according to claim 1, characterized in that, Includes the following steps: S1. Except for the silane coupling agent and dolomite powder, mix the remaining components according to the weight parts, stir, and obtain a mixed solution; S2. The silane coupling agent and the dolomite powder are added to the mixed solution in parts by weight and stirred to obtain an anti-condensation coating.

10. The application of an anti-condensation coating according to any one of claims 1 to 8 or an anti-condensation coating prepared by the preparation method according to claim 9 in preventing condensation on a surface.

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