Catalyst-free room temperature curing silicon resin environment-friendly coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of silicon resin coatings, and particularly relates to a catalyst-free room temperature curing silicon resin environment-friendly coating as well as a preparation method and application thereof. The catalyst-free room-temperature curing silicon resin environment-friendly coating provided by the invention is an environment-friendly coating with high-solid and low-viscosity characteristics, and the trialkoxy silicon resin monomer in the coating can be subjected to hydrolytic condensation reaction under the action of alkalinity provided by the amino silane coupling agent and atmospheric moisture to form a silicon resin coating; a flexible chain segment is introduced into the silicon resin coating, so that the silicon resin coating provided by the invention is good in flexibility, is not easy to crack under extreme temperature difference conditions such as-25 DEG C / 50 DEG C and the like, is excellent in weather resistance, and also has relatively good adhesive force, hardness and impact resistance; the catalyst-free room temperature curing silicon resin environment-friendly coating provided by the invention is low in upstream labor and raw material cost and good in downstream consumer experience; therefore, the technical problem that the performance of the outdoor silicon resin coating in the prior art needs to be improved is solved.

Description

Technical Field

[0001] This application belongs to the technical field of silicone resin coatings, and particularly relates to a catalyst-free room-temperature curing silicone resin environmental protection coating, its preparation method and application. Background Art

[0002] Outdoor facilities are easily affected by climate environmental factors such as ultraviolet rays, temperature, and humidity. Plastic facilities used outdoors are prone to aging phenomena such as yellowing, hardening, and cracking. Metal facilities used outdoors are prone to aging phenomena such as oxidation and rusting. Wooden facilities such as wooden house floors and furniture used outdoors are also prone to aging phenomena such as rough surfaces, fading, mildew, and rot due to the decomposition of lignin; coating the surface of outdoor facilities with a coating can play an anti-aging function.

[0003] Photocurable resin coatings can polymerize resin small molecules by means of ultraviolet rays, and can form a coating on the surface of wooden facilities used outdoors to provide protection for the wood. However, the photocurable resin small molecules will penetrate into the wood fibers, and the ultraviolet rays cannot be completely cured, resulting in the slow release of odors from the residual substances, causing the wood to emit odors for a long time and affecting the consumption experience. In addition, for porous solid woods such as pine, a primer often needs to be used before applying the photocurable resin coating to improve the adhesion, which increases the construction complexity of the operators and is not conducive to saving labor costs; compared with photocurable resin coatings, silicone resin coatings have a silicon chain structure, making them have good anti-aging performance. At the same time, the silicon-oxygen bonds in the silicone resin coating can bond with the hydroxyl groups on the wood surface, and have good adhesion without using a primer. In addition, the silicone resin coating can also use alcohols such as ethanol as solvents, and will not cause burrs, swelling, and deformation of the wood due to water penetration. The silicone resin coating is suitable for the protection of outdoor wooden facilities.

[0004] Existing silicone resin coatings often use catalysts such as organotin to catalyze the dehydration condensation reaction between silicon hydroxyl groups to form a silicone resin coating. However, when the silicone resin coating is used for wooden facilities used outdoors, the catalysts remaining in the silicone resin coating will cause aging problems of the coating. And currently, the silicone resin coating pays too much attention to high hardness, lacks flexible chain segments in the molecular chain, and the coating flexibility is not good. This makes the current silicone resin coating age and crack due to the large temperature difference outdoors when used outdoors, and the weather resistance and other properties of the silicone resin coating need to be improved. Summary of the Invention

[0005] In view of this, this application provides a catalyst-free room-temperature curing silicone resin environmental protection coating, its preparation method and application, to solve the technical problem that the performance of silicone resin coatings used outdoors in the prior art needs to be improved.

[0006] The first aspect of the present application provides a catalyst-free room-temperature curable silicone resin environmental protection coating, the raw materials of which include an amino-silane coupling agent, a dialkoxysilane resin monomer and / or linear polydimethylsiloxane, and a trialkoxysilane resin monomer;

[0007] Both ends of the molecular chain of the linear polydimethylsiloxane respectively include an alkoxy end group.

[0008] Preferably, the amino-silane coupling agent is selected from at least one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltriethoxysilane, N-γ-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-γ-(aminoethyl)-γ-aminopropyltriethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldiethoxysilane, N-γ-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, and N-γ-(aminoethyl)-γ-aminopropylmethyldiethoxysilane.

[0009] Preferably, the dialkoxysilane resin monomer is selected from at least one of dimethyldimethoxysilane, dimethyldiethoxysilane, trimethylmethoxysilane, and trimethylethoxysilane;

[0010] Preferably, the trialkoxysilane resin monomer is selected from at least one of methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, and phenyltriethoxysilane.

[0011] Preferably, the polymerization degree of the linear polydimethylsiloxane is 3 to 5,

[0012] The alkoxy end group of the linear polydimethylsiloxane includes a methoxy end group and / or an ethoxy end group.

[0013] Preferably, the end group of the linear polydimethylsiloxane further includes a methyl group and / or a phenyl group.

[0014] Preferably, calculated by mass, the catalyst-free room-temperature curable silicone resin environmental protection coating includes: 15 to 35 parts by mass of an amino-silane coupling agent, 25 to 35 parts by mass of a dialkoxysilane resin monomer and / or linear polydimethylsiloxane, and 40 to 60 parts by mass of a trialkoxysilane resin monomer.

[0015] The second aspect of the present application provides a preparation method of a catalyst-free room-temperature curable silicone resin environmental protection coating, which can prepare the catalyst-free room-temperature curable silicone resin environmental protection coating described in the first aspect. The method includes the steps of mixing an amino-silane coupling agent, a dialkoxysilane resin monomer and / or linear polydimethylsiloxane, a trialkoxysilane resin monomer and water, and then carrying out a prepolymerization reaction and ethanol dilution in sequence to obtain a catalyst-free room-temperature curable silicone resin environmental protection coating with an NK-2 of 10 to 20 s.

[0016] The third aspect of the present application provides an application of the catalyst-free room-temperature curable silicone resin environmental protection coating described in the first aspect in the field of outdoor facility protection.

[0017] Preferably, the outdoor facilities include metal outdoor facilities, plastic outdoor facilities or wooden outdoor facilities.

[0018] The fourth aspect of the present application provides an outdoor wooden furniture, which includes a wooden furniture and an outdoor protective coating;

[0019] The outdoor protective coating is formed by curing the catalyst-free room-temperature curable silicone resin environmental protection coating described in the first aspect on the surface of the wooden furniture.

[0020] Preferably, the thickness of the outdoor protective coating on the surface of the outdoor wooden furniture is 20 to 100 microns.

[0021] The fifth aspect of the present application provides an outdoor wooden sports equipment, which includes a wooden sports equipment and an outdoor protective coating;

[0022] The outdoor protective coating is formed by curing the catalyst-free room-temperature curable silicone resin environmental protection coating described in the first aspect on the surface of the wooden sports equipment.

[0023] Preferably, the thickness of the outdoor protective coating on the surface of the outdoor wooden sports equipment is 20 to 100 microns.

[0024] Compared with the prior art, the catalyst-free room-temperature curable silicone resin environmental protection coating provided by the present application has at least the following beneficial effects:

[0025] 1. For the catalyst-free room-temperature curable silicone resin environmental protection coating provided by the present application, through the alkalinity provided by the amino group contained in the amino-silane coupling agent and the moisture in the outdoor atmosphere, the silicone resin monomer can undergo hydrolysis and condensation to form a silicone resin coating without using catalysts such as organotin, and a flexible chain segment is introduced into the polysiloxane molecular chain of the three-dimensional network structure of the silicone resin coating; thus, it will not age and crack due to factors such as residual organotin catalysts and high hardness when used outdoors due to large outdoor temperature differences.

[0026] 2. The catalyst-free room-temperature curing silicone resin environmental protection coating provided by the present application does not require the use of a primer and can be directly sprayed onto the surface of substrates such as solid wood to form a coating with good adhesion. Moreover, it can provide good protection effects at both 20μm / 100μm, which is conducive to saving the labor and raw material costs of manufacturers.

[0027] 3. The catalyst-free room-temperature curing silicone resin environmental protection coating provided by the present application has a wide range of applications. In addition to being applicable to outdoor equipment such as plastics and metals, it can also be used on the surfaces of outdoor wooden sports equipment or furniture to provide good protection, and it will not easily emit odors like photocuring resins, which is conducive to improving the user experience of consumers.

[0028] 4. The catalyst-free room-temperature curing silicone resin environmental protection coating provided by the present application has the characteristics of high solid content and low viscosity, and does not require the use of benzene, ketone or their mixed solvents for dilution. It is an environmental protection resin coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic flow chart of a method for preparing a catalyst-free room-temperature curing silicone resin environmental protection coating provided in Embodiment 1 of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present application provides a catalyst-free room-temperature curing silicone resin environmental protection coating, a preparation method and an application thereof, which are used to solve the technical problem that the performance of silicone resin coatings used outdoors in the prior art needs to be improved.

[0032] The following will clearly and completely describe the technical solutions of the present application with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0033] In view of the fact that the silicone resin coatings used outdoors currently will age and crack due to factors such as residual catalysts such as organotin and high hardness when used outdoors because of the large temperature difference outdoors, and the weather resistance and other performances of the silicone resin coatings need to be improved; the present application provides a catalyst-free room-temperature curing silicone resin environmental protection coating, and the present application provides an amino silane coupling agent, a dialkoxy silicone resin monomer and / or a linear polydimethylsiloxane, as well as a trialkoxy silicone resin monomer.

[0034] In the catalyst-free room-temperature curing silicone resin environmental protection coating provided by the present application, the trialkoxysilane resin monomer contains three alkoxy functional groups. After the coating is sprayed on outdoor equipment, by using the alkalinity provided by the amino group in the amino-functional silane coupling agent, the alkoxy functional groups undergo hydrolysis and condensation reactions by absorbing moisture in the atmosphere at room temperature to form a continuous and dense three-dimensional network structure of polysiloxane molecular chains, thereby providing a silicone resin coating protection for outdoor equipment. At the same time, a dialkoxysilane resin monomer and / or linear polydimethylsiloxane are also introduced into the silicone resin coating provided by the present application. The dialkoxysilane resin monomer contains two alkoxy functional groups, and the hydrolytic condensation forms linear polysiloxane molecular chains. This enables a certain proportion of linear polysiloxane molecular chains to exist in the three-dimensional network structure of polysiloxane molecular chains, improving the flexibility of the silicone resin coating. The dialkoxysilane resin monomer plays the role of a flexible chain segment. Similarly, after the linear polydimethylsiloxane is incorporated into the three-dimensional network structure of polysiloxane molecular chains by hydrolytic condensation of the alkoxy end groups, it can also play the role of a flexible chain segment. This makes the catalyst-free room-temperature curing silicone resin environmental protection coating provided by the present application have good flexibility after undergoing hydrolysis and condensation reactions by absorbing moisture in the atmosphere, and it is not easy to crack under extreme temperature differences such as low temperature (-25°C) and high temperature (50°C), and has excellent weather resistance performance. At the same time, the silicone resin coating also has good adhesion, hardness and impact resistance, improving the performance of the silicone resin coating for outdoor use, and is very suitable for protecting outdoor facilities.

[0035] Preferably, in the catalyst-free room-temperature curing silicone resin environmental protection coating provided by the present application, the structural general formula of the amino-functional silane coupling agent is shown in Formula I or Formula II;

[0036] Formula I;

[0037] Formula II;

[0038] In Formula I or Formula II, R 、 is selected from γ-aminopropyl, N-β-(aminoethyl)-γ-aminopropyl, N-γ-(aminoethyl)-γ-aminopropyl;

[0039] R is selected from methyl or ethyl.

[0040] Preferably, in the catalyst-free room-temperature curing silicone resin environmental protection coating provided by the present application, the structural general formulas of the dialkoxysilane resin monomer and linear polydimethylsiloxane are shown in Formula III and Formula IV;

[0041] Formula III;

[0042] Formula IV;

[0043] In formula III, R is selected from methyl or ethyl;

[0044] In formula IV, R is selected from methyl or ethyl, and R 、 is selected from methyl or phenyl.

[0045] Preferably, in the catalyst-free room-temperature curable silicone resin environmental protection coating provided by the present application, the general structural formula of the trialkoxysilane resin monomer is as shown in formula V;

[0046] Formula V;

[0047] In formula V, R is selected from methyl or phenyl, and R 、 is selected from methyl or ethyl.

[0048] Preferably, in the catalyst-free room-temperature curable silicone resin environmental protection coating provided by the present application, calculated by mass, it includes 15-35 parts by mass of an amino silane coupling agent, 25-35 parts by mass of a dialkoxysilane resin monomer and / or linear polydimethylsiloxane, and 40-60 parts by mass of a trialkoxysilane resin monomer.

[0049] Correspondingly, the present application also provides a preparation method of the above-mentioned catalyst-free room-temperature curable silicone resin environmental protection coating. The preparation method includes: mixing an amino silane coupling agent, a dialkoxysilane resin monomer and / or linear polydimethylsiloxane, a trialkoxysilane resin monomer and water, and then carrying out a prepolymerization reaction in sequence to obtain a catalyst-free room-temperature curable silicone resin environmental protection coating; the temperature of the prepolymerization reaction can be controlled at about 60 °C, and the termination of the prepolymerization reaction is determined by viscosity. When the viscosity of the catalyst-free room-temperature curable silicone resin environmental protection coating after prepolymerization is measured to be about 40 seconds by an Iwata #2 cup, the prepolymerization reaction is terminated to obtain a catalyst-free room-temperature curable silicone resin environmental protection coating; then it can be diluted with a small amount of ethanol to obtain a high-solid and low-viscosity silicone resin coating (solid content ≥ 70%, viscosity: Iwata #2 = 9.31 s). Moreover, ordinary carbon-chain oil-based resin coatings usually need to be diluted with a large amount of benzene, ketone or their mixed solvents such as toluene, acetone, and thinners, while the silicone resin coating prepared in the present application does not need to be diluted with benzene, ketone or their mixed solvents, is friendly to the environment and human body, and is an environmental protection resin coating.

[0050] Correspondingly, the present application also provides an application of the above-mentioned catalyst-free room-temperature curable silicone resin environmental protection coating. The application is: for the protection of metal outdoor facilities, plastic outdoor facilities or wooden outdoor facilities.

[0051] Meanwhile, the present application also provides several types of wooden furniture or wooden sports equipment suitable for outdoor use, which are formed by curing the above-mentioned catalyst-free room-temperature curing silicone resin environmental protection coating on the surface of wooden furniture or wooden sports equipment. For example, after curing a silicone resin coating on the surface of some wooden furniture or sports equipment such as wooden tables and chairs, dining tables, cabinets, clothes racks, drying racks, swings, etc. used in courtyards, balconies, and terraces, good protection effects can be achieved, and they can be used for a long time without aging phenomena such as fading, mildew, and rot.

[0052] The following will specifically describe a catalyst-free room-temperature curing silicone resin environmental protection coating provided by the present application in combination with examples and experimental examples.

[0053] Example 1

[0054] This example provides a catalyst-free room-temperature curing silicone resin environmental protection coating, and the preparation method includes steps of raw material preparation, prepolymerization reaction, and dilution.

[0055] The step of raw material preparation includes: weighing 250 g of amino silane coupling agent γ-aminopropyltrimethoxysilane, 300 g of dialkoxy silicone resin monomer dimethyldimethoxysilane, 500 g of trialkoxy silicone resin monomer methyltrimethoxysilane, and 100 g of deionized water.

[0056] The step of prepolymerization reaction includes: mixing γ-aminopropyltrimethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, and deionized water evenly and carrying out a prepolymerization reaction at a temperature of 60 °C. After the prepolymerization reaction is completed, a catalyst-free room-temperature curing silicone resin environmental protection coating is obtained, with a solid content of 42% and a flow time through an Iwata No. 2 cup at room temperature (22 °C) of 40 seconds.

[0057] The step of dilution includes: diluting the catalyst-free room-temperature curing silicone resin environmental protection coating after the prepolymerization reaction with 50% ethanol to a flow time through an Iwata No. 2 cup at room temperature (22 °C) of 9.31 seconds.

[0058] Example 2

[0059] This example provides a catalyst-free room-temperature curing silicone resin environmental protection coating, and the difference in the preparation method from Example 1 lies in adjusting the dosage of raw materials, including steps of raw material preparation, prepolymerization reaction, and dilution.

[0060] The step of raw material preparation includes: weighing 150 g of amino silane coupling agent γ-aminopropyltrimethoxysilane, 250 g of dialkoxy silicone resin monomer dimethyldimethoxysilane, 400 g of trialkoxy silicone resin monomer methyltrimethoxysilane, and 100 g of deionized water.

[0061] The steps of the prepolymerization reaction include: uniformly mixing γ-aminopropyltrimethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane and deionized water, and then conducting a prepolymerization reaction at a temperature of 60°C. After the prepolymerization reaction, a catalyst-free room temperature curing silicone resin environmentally friendly coating is obtained, and the time for it to flow out of the Iwata 2# cup at room temperature (22°C) is 40 seconds.

[0062] The dilution step includes: diluting the catalyst-free room temperature curing silicone resin environmentally friendly coating after the prepolymerization reaction with 50% ethanol until the time it takes to flow out of the Iwata No. 2 cup at room temperature (22° C.) is 9.31 seconds.

[0063] Example 3

[0064] This embodiment provides a catalyst-free, room temperature curing silicone resin environmentally friendly coating. The preparation method is different from that of Example 1 in that the amount of raw materials is adjusted, including the steps of raw material preparation, prepolymerization reaction, and dilution.

[0065] The steps of preparing raw materials include: weighing 350g of aminosilane coupling agent γ-aminopropyltrimethoxysilane, 350g of dialkoxy silicone resin monomer dimethyldimethoxysilane, 600g of trialkoxy silicone resin monomer methyltrimethoxysilane and 100g of deionized water.

[0066] The steps of the prepolymerization reaction include: uniformly mixing γ-aminopropyltrimethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane and deionized water, and then conducting a prepolymerization reaction at a temperature of 60°C. After the prepolymerization reaction, a catalyst-free room temperature curing silicone resin environmentally friendly coating is obtained, and the time for it to flow out of the Iwata 2# cup at room temperature (22°C) is 40 seconds.

[0067] The dilution step includes: diluting the catalyst-free room temperature curing silicone resin environmentally friendly coating after the prepolymerization reaction with 50% ethanol until the time it takes to flow out of the Iwata No. 2 cup at room temperature (22° C.) is 9.31 seconds.

[0068] Experimental Example 1

[0069] Experimental Example 1 of the present application carried out performance testing on the catalyst-free room temperature curing silicone resin environmentally friendly coating prepared in Example 1. The substrates used in the performance test were tinplate and solid wood, including adhesion test, hardness test, impact resistance test, flexibility test and hot and cold cycle test. The test results are shown in Tables 1-2.

[0070] Among them, the adhesion test refers to the national standard GB / T 9286-1998 "Scratch test for paint and varnish films" and adopts the 100-grid test method. First, the catalyst-free room-temperature curing silicone resin environmentally friendly coating is sprayed on the tinplate and solid wood, and the spraying includes thin coating (20μm) and thick coating (100μm); after the coating is cured, 100 small squares are cut on the surface of the silicone resin coating with a sharp knife. The cutting depth must reach the surface of the substrate, and then the square area is scratched with fingernails or a sharp tool; the test results show that the square coating does not fall off, indicating that the adhesion is 100%. The catalyst-free room-temperature curing silicone resin environmentally friendly coating provided in this application has good adhesion after curing, and can be completely cured in three days, and there is little difference between curing in three days and seven days.

[0071] The hardness test refers to the national standard GB / T 6739-2006 "Determination of film hardness of paint and varnish by pencil method". The pencil hardness test method is adopted. First, the catalyst-free room temperature curing silicone resin environmentally friendly coating is sprayed on the tinplate and solid wood. The spraying includes thin coating (20μm) and thick coating (100μm). After the coating is cured, pencils with hardness from low to high are selected, starting from 45 o Apply a certain pressure at an angle to push the pencil on the surface of the silicone coating to observe whether the silicone coating is scratched. The previous level of the pencil hardness that can scratch the silicone coating is the coating hardness. The test results show that after the third and seventh days of curing, the catalyst-free room-temperature curing silicone environmentally friendly coating provided by the present application can be completely cured in three days, and the hardness is 1H.

[0072] The impact resistance performance refers to the national standard GB / T 1732-2020 "Determination of impact resistance of paint film" and adopts a drop hammer impact test. First, the catalyst-free room temperature curing silicone resin environmentally friendly coating is sprayed on the tinplate, and the spraying includes thin coating (20μm) and thick coating (100μm); after the coating is cured, a heavy hammer is used to freely fall from different heights to impact the surface of the silicone resin coating to observe whether the coating has cracking, peeling and other damage phenomena; the test results show that the catalyst-free room temperature curing silicone resin environmentally friendly coating provided in this application can be fully cured in three days and can withstand the impact of a heavy hammer at a height of 50cm.

[0073] The flexibility test refers to the national standard GB / T 1731-2020 "Determination of flexibility of paint film and putty film" and adopts a bending test. First, a catalyst-free room-temperature curing silicone resin environmentally friendly coating is sprayed on the tinplate, and the spraying includes thin coating (20μm) and thick coating (100μm); after the coating is cured, it is bent around a cylindrical shaft whose diameter begins to gradually decrease. When the silicone resin coating cracks, the diameter of the cylindrical shaft is recorded at this time; the test results show that the flexibility of the silicone resin coating after the catalyst-free room-temperature curing silicone resin environmentally friendly coating provided in the application is greater than 12mm, indicating that the silicone resin coating can be bent around a cylindrical shaft with a diameter of 12mm without cracking of the coating or other damage.

[0074] The hot and cold cycle test refers to GB / T 4893.7-2013 "Test for the physical and chemical properties of furniture surface paint films". The hot and cold temperature difference test method is adopted. First, the catalyst-free room temperature curing silicone resin environmentally friendly paint is sprayed on the solid wood. The spraying includes thin coating (20μm) and thick coating (100μm); after the paint is cured, a high and low temperature circulation box is used, and the low temperature is set to -25℃, the high temperature is 50℃, and the number of cycles is 7. Use a magnifying glass to observe whether the coating surface is cracked, bubbling, peeling or discoloration; the test results show that the silicone resin coating of the catalyst-free room temperature curing silicone resin environmentally friendly paint provided in the application does not crack after curing.

[0075] Table 1: Test results of silicone coating on tinplate

[0076]

[0077] Table 2: Test results of silicone coating on solid wood

[0078]

[0079] It can be seen from the test results shown in Tables 1 and 2 that the silicone resin coating formed by spraying the catalyst-free room-temperature curing silicone resin environmentally friendly coating provided by the present application on tinplate or solid wood has excellent adhesion, hardness, impact resistance, flexibility and hot and cold cycle. It can be cured to form a silicone resin coating after absorbing moisture in the atmosphere outdoors for three days, achieving excellent protective performance. The coating performance does not change much after seven days, indicating that the room-temperature curing silicone resin coating with the catalyst provided by the present application has a faster curing speed. At the same time, there is no obvious difference in performance between the coating thickness of 20μm and 100μm, indicating that the catalyst-free room-temperature curing silicone resin environmentally friendly coating provided by the present application only needs to be sprayed with a smaller thickness to achieve good protective effect.

[0080] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An environmentally friendly catalyst-free room-temperature curable silicone resin coating, characterized in that, It includes an amino-silane coupling agent, a dialkoxysiloxane resin monomer and / or linear polydimethylsiloxane, and a trialkoxysiloxane resin monomer; Both ends of the molecular chain of the linear polydimethylsiloxane respectively include an alkoxy end group.

2. The environmentally friendly catalyst-free room-temperature curing silicone resin coating according to claim 1, wherein The amino-silane coupling agent is selected from at least one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltriethoxysilane, N-γ-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-γ-(aminoethyl)-γ-aminopropyltriethoxysilane, γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, N-β-(aminoethyl)-γ-aminopropylmethyldiethoxysilane, N-γ-(aminoethyl)-γ-aminopropylmethyldimethoxysilane, and N-γ-(aminoethyl)-γ-aminopropylmethyldiethoxysilane.

3. An environmentally friendly catalyst-free room-temperature curing silicone resin coating according to claim 1, characterized in that, The dialkoxysiloxane resin monomer is selected from at least one of dimethyldimethoxysilane, dimethyldiethoxysilane, trimethylmethoxysilane, and trimethylethoxysilane.

4. An environmentally friendly catalyst-free room temperature curable silicone resin coating according to claim 1, characterized in that, The trialkoxysiloxane resin monomer is selected from at least one of methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, and phenyltriethoxysilane.

5. An environmentally friendly catalyst-free room-temperature curing silicone resin coating according to claim 1, characterized in that, The polymerization degree of the linear polydimethylsiloxane is 3 to 8. The alkoxy end group of the linear polydimethylsiloxane includes a methoxy end group and / or an ethoxy end group.

6. The room temperature curable silicone resin environmental protection coating without catalyst according to claim 1, characterized in that, Calculated by mass parts, the catalyst-free room-temperature curing silicone resin environmentally friendly coating includes: 15 to 35 mass parts of amino-silane coupling agent, 25 to 35 mass parts of dialkoxysiloxane resin monomer and / or linear polydimethylsiloxane, and 40 to 60 mass parts of trialkoxysiloxane resin monomer.

7. A preparation method of a catalyst-free room-temperature curing silicone resin environmental protection coating, characterized in that, For preparing a catalyst-free room-temperature curing silicone resin environmentally friendly coating according to any one of claims 1-6, it includes the steps of: mixing an amino-silane coupling agent, a dialkoxysiloxane resin monomer and / or linear polydimethylsiloxane, a trialkoxysiloxane resin monomer and water, and then successively carrying out a prepolymerization reaction and ethanol dilution to obtain a catalyst-free room-temperature curing silicone resin environmentally friendly coating with an NK-2 of 10 to 20 s.

8. Application of a catalyst-free room-temperature curing silicone resin environmentally friendly coating according to any one of claims 1-6 in the field of outdoor facility protection.

9. An outdoor wooden furniture, characterized in that, It includes wooden furniture and an outdoor protective coating; the outdoor protective coating is formed by curing a catalyst-free room-temperature curing silicone resin environmentally friendly coating according to any one of claims 1-6 on the surface of the wooden furniture.

10. An outdoor wooden sports equipment, characterized in that, It includes wooden sports equipment and an outdoor protective coating; the outdoor protective coating is formed by curing a catalyst-free room-temperature curing silicone resin environmentally friendly coating according to any one of claims 1-6 on the surface of the wooden sports equipment.

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