Octyl fluorinated silicone resin emulsion and its preparation method and application in concrete surface protection

Abstract

The present invention belongs to the technical field of building materials, and relates to an octyl fluorine-containing silicone resin emulsion, a preparation method thereof, and its application in concrete surface protection. In parts by weight, the following raw materials are included: 3 to 4 parts of emulsifier, 0.5 to 1 part of polyethylene glycol, 0.3 to 0.5 parts of silicone defoamer, 10 to 12 parts of silicone-acrylic emulsion, 25 to 30 parts of water, and 55 to 60 parts of silane; wherein the emulsifier is composed of perchlorate O and Span80 in a mass ratio of 1.22 to 1.71:1; the silane is composed of 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane and isooctyl triethoxysilane in a mass ratio of 2.5 to 3.5:1. The octyl fluorine-containing silicone resin emulsion provided by the present invention can not only effectively prevent emulsion stratification, but also has strong adhesion after being applied to the concrete surface, good impregnation effect, and excellent waterproof performance.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials and relates to an octyl fluorine-containing organic silicon resin emulsion and a preparation method thereof and application thereof in concrete surface protection. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] The pores and cracks on the surface and inside of concrete materials make concrete vulnerable to the invasion of water and water-soluble harmful ions, leading to durability problems such as steel corrosion in reinforced concrete structures and concrete salt freeze damage. Therefore, it is very important to improve the waterproofness of concrete. The methods for improving the waterproofness of concrete can be divided into two categories: overall concrete waterproofing and surface waterproofing. Among them, concrete surface waterproofing can improve the durability of concrete by taking protective measures only on the surface of existing or newly built concrete. It is a widely applicable and cost-effective method.

[0004] Concrete surface waterproofing treatment methods can be divided into three types according to the working principle: surface film-forming type, surface penetration type and hydrophobic impregnation type. The hydrophobic impregnation type can penetrate into the concrete surface within a certain depth range and form a hydrophobic film layer on the concrete surface to prevent external water and water-soluble harmful ions from entering the concrete. While ensuring the breathability of the concrete, it also improves the overall waterproof ability of the concrete, and has obvious advantages in engineering applications.

[0005] Organosilane / siloxane is a commonly used hydrophobic impregnation material for concrete surface in engineering. After acting on the concrete surface, the organosilicon material undergoes hydrolysis reaction with liquid water or water vapor inside the concrete in the alkaline environment provided by Ca(OH)2, NaOH and KOH inside the concrete to expose the silanol group. The silanol groups can undergo dehydration condensation to form stable Si-O-Si bonds, which are cross-linked to form a thin layer of organosilicon resin. At the same time, the silanol groups can further undergo dehydration condensation with active hydroxyl groups provided by concrete hydration products such as hydrated calcium silicate and Ca(OH)2 to form stable Si-O bonds, so that the thin layer of organosilicon resin is fixed inside the concrete matrix. The unhydrolyzed hydrophobic -R groups are arranged on the surface of the concrete and outside the internal pores to form a hydrophobic protective net, thereby achieving a waterproof effect.

[0006] According to the inventor's research, there are three types of hydrophobic impregnated silane waterproof products for engineering applications: silane liquid, silane paste and silane emulsion. The silane content of silane liquid products is ≥98%, and the volatility and fluidity are strong. They are easy to lose during the spraying process of facade construction, and some products need to be diluted by using organic solvents such as gasoline, solvent oil, benzene solvents, etc., which are toxic and not environmentally friendly. The silane content of silane paste products is ≥60%, and the fluidity is low. It is suitable for facade construction, but spraying is inconvenient and the applicable scenarios are limited. Compared with silane liquid and silane paste, silane emulsion has a lower silane content, generally 40% to 60%, and low volatility. It is an environmentally friendly product, so it has the advantages of cost saving and environmental protection, but there are currently common problems such as easy stratification of emulsions, poor adhesion to concrete surfaces, and poor waterproofing effects. Therefore, a silane emulsion waterproof material with strong adhesion and deep impregnation depth is studied, which effectively improves the waterproof performance of the concrete surface and thus improves the overall durability of the concrete. It is an economical method for improving the durability of concrete with broad application prospects. Summary of the invention

[0007] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide an octyl fluorinated organosilicon resin emulsion, a preparation method thereof, and application thereof in concrete surface protection. The octyl fluorinated organosilicon resin emulsion provided by the present invention can not only effectively prevent emulsion stratification, but also has strong adhesion after being applied to the concrete surface, good impregnation effect, and excellent waterproof performance.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] In the first aspect, an octyl fluorine-containing silicone resin emulsion comprises the following raw materials, in parts by weight: 3 to 4 parts of an emulsifier, 0.5 to 1 part of polyethylene glycol, 0.3 to 0.5 parts of an organosilicon defoamer, 10 to 12 parts of a silicone-acrylic emulsion, 25 to 30 parts of water, and 55 to 60 parts of silane;

[0010] The emulsifier is composed of peregrine O and Span80 in a mass ratio of 1.22 to 1.71:1; the silane is composed of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane and isooctyltriethoxysilane in a mass ratio of 2.5 to 3.5:1.

[0011] Emulsion is a heterogeneous system mixture (or dispersion system) formed by dispersing two or more immiscible substances through emulsifiers and / or dispersants. Compared with the solution of the homogeneous system, the stability of the emulsion as a heterogeneous system is poor, and its external manifestation is easy stratification. For the emulsion provided by the present invention, the main purpose is to apply it on the concrete surface for protection to increase the waterproof performance. In general, the waterproof performance of the material can be increased by adding hydrophobic materials, but for emulsions, adding hydrophobic materials usually destroys the dispersion system of the original emulsion, making it difficult for the discontinuous phase to exist stably in the continuous phase, resulting in a decrease in the stability of the emulsion, or even the inability to form an emulsion. At the same time, the adhesion of the concrete surface after the emulsion is applied will also have the problem of emulsion stability by adding functional materials. Therefore, it is extremely difficult to improve the emulsion used for concrete surface protection while ensuring its emulsion performance (especially stability) to improve the waterproof performance and adhesion of the concrete surface.

[0012] For this purpose, in the emulsion of the present invention, Perchlorate O and Span80 are used as composite emulsifiers, polyethylene glycol is used as dispersant, isooctyl triethoxysilane is mixed with 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane as hydrophobic effective ingredients, and silicone defoamer is used to reduce bubbles in the preparation process and after the finished product. Among them, the mass ratio of 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane and isooctyl triethoxysilane is adjusted to 2.5-3.5:1, which can ensure the formation of the emulsion on the basis of ensuring the hydrophobic effective ingredients; the added silicone acrylic emulsion effectively prevents the stratification of the emulsion, and the emulsion can generate silicone resin after being applied to the concrete surface, which reduces fluidity, enhances adhesion, and increases the hydrophobic impregnation depth; at the same time, the silicone resin blocks the pores and microcracks within a certain depth range on the surface, further improving the waterproof ability of the concrete surface.

[0013] In a second aspect, a method for preparing the above-mentioned octyl fluorine-containing silicone resin emulsion comprises the following steps:

[0014] 1H,1H,2H,2H-perfluorooctyltriethoxysilane, isooctyltriethoxysilane and Span80 were uniformly mixed to obtain oil phase A;

[0015] Mixing perchlorate O, polyethylene glycol, silicone defoamer and water to obtain aqueous phase B;

[0016] Under stirring conditions of 35-40° C. and 700-800 r / min, add the oil phase A to the water phase B and emulsify for 5-15 min to obtain emulsion C;

[0017] After adding the silicone acrylic emulsion into emulsion C, emulsify for 4 to 5 hours at 35 to 40° C. and 2000 to 2400 r / min of stirring to obtain the product.

[0018] In order to obtain a more stable and uniform emulsion, the present invention adjusts the order of adding each raw material, the preparation temperature, the stirring rate and the time, so that the oil phase as the discontinuous phase is more stably dispersed in the water phase as the continuous phase, thereby ensuring that the obtained octyl fluorine-containing silicone resin emulsion is more stable and uniform.

[0019] In a third aspect, a use of the above-mentioned octyl fluorinated silicone resin emulsion in concrete surface protection.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides an octyl fluorine-containing silicone resin emulsion for concrete surface protection, which determines the ratio of isooctyl triethoxysilane and 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane in the emulsion, limits the blending range of the composite emulsifiers Peregal O and Span80 and the dispersant PEG2000, thereby realizing the preparation of the emulsion. The silicone acrylic emulsion added to the emulsion increases the stability of the emulsion, solves the problem that the emulsion is easy to stratify due to the addition of 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane, and the silicone defoamer reduces the bubbles in the emulsion preparation and finished product, ensuring the emulsification quality and storage stability of the emulsion.

[0022] The present invention provides an octyl fluorine-containing silicone resin emulsion for concrete surface protection. The fluorine-containing functional groups of 1H,1H,2H,2H-perfluorooctyltriethoxysilane added in the emulsion have lower surface energy than methyl functional groups, and can be combined with isooctyltriethoxysilane to synergistically improve the hydrophobicity of concrete, thereby achieving excellent hydrophobic effect.

[0023] The present invention provides an octyl fluorine-containing organic silicone resin emulsion for concrete surface protection. The silicone acrylic emulsion is added during the preparation process, so that the emulsion of the present invention can generate silicone resin after being applied to the concrete surface, and the fluidity is reduced, and the adhesion is enhanced. As the water in the emulsion evaporates, the emulsion slowly releases hydrophobic silane after demulsification, thereby increasing the hydrophobic impregnation depth of the silane. In addition, the silicone resin can block and repair the pores and micro cracks within a certain depth range on the concrete surface, thereby blocking the path for water to enter the interior of the concrete from the surface, and further improving the waterproof performance of the concrete surface.

[0024] Studies have shown that the hydrophobic layer formed by the octyl fluorine-containing silicone resin emulsion for concrete surface protection provided by the present invention is about 2 to 3 times thicker than the emulsion prepared by the prior art, and the degree of water absorption reduction is increased by 2% to 10%.

[0025] The present invention also provides a method for preparing an octyl fluorine-containing silicone resin emulsion for concrete surface protection. During the preparation process, by controlling the order of adding materials, the preparation temperature, the stirring rate and time, etc., the prepared silicone resin emulsion can be ensured to be more stable and uniform, which is convenient for construction. The preparation process of the emulsion is simple and easy to operate, with low cost, and the protective layer formed after being applied to the concrete meets the requirements. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] In view of the problems of easy stratification, poor adhesion to concrete surface and poor waterproof effect of existing silane emulsions, in order to simultaneously provide the stability of the emulsion, poor adhesion to concrete surface and waterproof effect, the present invention proposes an octyl fluorine-containing silicone resin emulsion, a preparation method thereof and its application in concrete surface protection.

[0029] A typical embodiment of the present invention provides an octyl fluorine-containing silicone resin emulsion, which comprises the following raw materials in parts by weight:

[0030] 3-4 parts of emulsifier, 0.5-1 parts of polyethylene glycol, 0.3-0.5 parts of silicone defoamer, 10-12 parts of silicone-acrylic emulsion, 25-30 parts of water, 55-60 parts of silane;

[0031] The emulsifier is composed of peregrine O and Span80 in a mass ratio of 1.22 to 1.71:1; the silane is composed of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane and isooctyltriethoxysilane in a mass ratio of 2.5 to 3.5:1.

[0032] In some embodiments, the polyethylene glycol is PEG2000.

[0033] The organosilicon defoamer used in the present invention can be any type of organosilicon defoamer. In some embodiments, the organosilicon defoamer is organosilicon defoamer AFE-1410. The verification using organosilicon defoamer AFE-1410 shows that the prepared octyl fluorinated organosilicon resin emulsion can better solve the problems of easy stratification of the emulsion, poor adhesion to the concrete surface and poor waterproofing effect.

[0034] In some embodiments, the silicone-acrylic emulsion is silicone-acrylic emulsion BF-400B. The present invention uses silicone-acrylic emulsion BF-400B for verification and shows that the prepared octyl fluorine-containing silicone resin emulsion can better solve the problems of easy emulsion stratification, poor adhesion to concrete surface and poor waterproof effect.

[0035] Another embodiment of the present invention provides a method for preparing the above-mentioned octyl fluorine-containing silicone resin emulsion, comprising the following steps:

[0036] 1H,1H,2H,2H-perfluorooctyltriethoxysilane, isooctyltriethoxysilane and Span80 were uniformly mixed to obtain oil phase A;

[0037] Mixing perchlorate O, polyethylene glycol, silicone defoamer and water to obtain aqueous phase B;

[0038] Under stirring conditions of 35-40° C. and 700-800 r / min, add the oil phase A to the water phase B and emulsify for 5-15 min to obtain emulsion C;

[0039] Add the silicone acrylic emulsion to emulsion C and mix well, then emulsify for 4 to 5 hours at 35 to 40° C. and 2000 to 2400 r / min of stirring to obtain the product.

[0040] In some embodiments, the oil phase A is prepared at 35-40° C. and 700-800 r / min of stirring. This condition can not only make the materials mix more quickly, but also avoid affecting the preparation of emulsion C. Specifically, the stirring time is 2-5 min.

[0041] In some embodiments, the aqueous phase B is prepared at 35-40° C. and 700-800 r / min of stirring. This condition can not only make the materials mix more quickly, but also avoid affecting the preparation of emulsion C. Specifically, the stirring time is 2-5 min.

[0042] In some embodiments, the water is deionized water. When deionized water is used, it is possible to avoid the introduction of impurity ions into the water, thereby preventing the reduction of emulsion stability.

[0043] In some embodiments, the oil phase A is added to the water phase B at a uniform speed for 5 to 15 minutes. Under this condition, the emulsion C can be obtained better.

[0044] In some embodiments, the silicone-acrylic emulsion is uniformly added to the emulsion C, and the addition time is maintained at 5 to 10 minutes. Under this condition, the emulsion C and the silicone-acrylic emulsion can be mixed evenly, while avoiding the imbalance of the two emulsion states during the addition process, thereby better ensuring the success rate of preparing the octyl fluorinated organic silicone resin emulsion.

[0045] A third embodiment of the present invention provides a use of the above-mentioned octyl fluorine-containing silicone resin emulsion in concrete surface protection.

[0046] In some embodiments, the concrete surface protection is concrete surface waterproofing.

[0047] In some embodiments, the method for protecting the concrete surface is: coating the octyl fluorine-containing silicone resin emulsion on the concrete surface at least twice.

[0048] Specifically, the amount of the octyl fluorine-containing silicone resin emulsion applied in a single application is 250 to 350 g / m 2 , preferably 280 to 320 g / m 2 This coating amount can better exert the protective effect of the octyl fluorinated silicone resin emulsion on the concrete surface.

[0049] Specifically, the interval between two adjacent coatings is 50 to 70 minutes, so that the active ingredients in the octyl fluorinated silicone resin emulsion after the previous coating can be better attached to the concrete surface, thereby achieving a better surface protection effect.

[0050] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in combination with specific embodiments and comparative examples.

[0051] Embodiment 1:

[0052] A method for preparing an octyl fluorine-containing silicone resin emulsion for concrete surface protection comprises the following steps:

[0053] (1) Weigh 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, isooctyltriethoxysilane and Span80 in proportion and add them into a container, heat and maintain the temperature at 40°C, stir at 800 r / min for 5 min, and prepare a uniform oil phase A.

[0054] (2) Take another clean container, add proportional amounts of Perchlorate O, deionized water, PEG2000 and defoaming agent, heat and maintain the temperature at 40°C, stir at 700 r / min for 5 min, and prepare a uniform aqueous phase B.

[0055] (3) Keeping the temperature and stirring speed constant, add the oil phase A to the water phase B at a uniform rate, and keep the addition time at 10 min to obtain emulsion C.

[0056] (4) Keeping the temperature and stirring speed constant, add the silicone-acrylic emulsion into emulsion C at a uniform rate, and maintain the addition time at 8 minutes.

[0057] (5) The temperature was kept constant, and the high-speed stirring emulsification was stopped at 2200 r / min for 4.5 hours to obtain an octyl fluorinated silicone resin emulsion for concrete surface protection.

[0058] (6) Store the emulsion in a clean container and seal it.

[0059] The mass ratio of the materials in each step is as follows: 6 g of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, 18 g of isooctyltriethoxysilane, 0.44 g of Span80, 0.76 g of peregrine O, 10.4 g of deionized water, 0.2 g of PEG2000, 0.2 g of silicone defoamer, and 4 g of silicone-acrylic emulsion.

[0060] Embodiment 2:

[0061] A method for preparing an octyl fluorine-containing silicone resin emulsion for concrete surface protection comprises the following steps:

[0062] (1) Weigh 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, isooctyltriethoxysilane and Span80 in proportion and add them into a container, heat and maintain the temperature at 35°C, stir at 700 r / min for 5 min, and prepare a uniform oil phase A.

[0063] (2) Take another clean container, add proportional amounts of Perchlorate O, deionized water, PEG2000 and defoaming agent, heat and maintain the temperature at 35°C, stir at 700 r / min for 5 min, and prepare a uniform aqueous phase B.

[0064] (3) Keeping the temperature and stirring speed constant, add the oil phase A to the water phase B at a uniform rate, and keep the addition time at 10 min to obtain emulsion C.

[0065] (4) Keeping the temperature and stirring speed constant, add the silicone-acrylic emulsion into emulsion C at a uniform rate, and maintain the addition time at 5 minutes.

[0066] (5) Keeping the temperature constant, stirring the mixture at a high speed of 2000 r / min for 4 hours and then stopping the stirring, thereby obtaining an octyl fluorinated silicone resin emulsion for concrete surface protection.

[0067] (6) Store the emulsion in a clean container and seal it.

[0068] The mass ratio of the materials in each step is as follows: 5.5 g of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, 16.5 g of isooctyltriethoxysilane, 0.5 g of Span80, 0.7 g of peregrine O, 11.48 g of deionized water, 0.4 g of PEG2000, 0.12 g of silicone defoamer, and 4.8 g of silicone acrylic emulsion.

[0069] Embodiment 3:

[0070] A method for preparing an octyl fluorine-containing silicone resin emulsion for concrete surface protection comprises the following steps:

[0071] (1) Weigh 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane and isooctyltriethoxysilane and Span80 in proportion and add them into a container, heat and maintain the temperature at 37°C, stir at 800 r / min for 2 min, and prepare a uniform oil phase A.

[0072] (2) Take another clean container, add proportional amounts of Perchlorate O, deionized water, PEG2000 and defoaming agent, heat and maintain the temperature at 37°C, stir at 800 r / min for 2 min, and prepare a uniform aqueous phase B.

[0073] (3) Keeping the temperature and stirring speed constant, add the oil phase A to the water phase B at a uniform rate, and keep the addition time at 5 min to obtain emulsion C.

[0074] (4) Keeping the temperature and stirring speed constant, add the silicone-acrylic emulsion into emulsion C at a uniform rate, and maintain the addition time at 8 minutes.

[0075] (5) Keeping the temperature constant, stirring the mixture at a high speed of 2200 r / min for emulsification for 5 hours and then stopping to obtain an octyl fluorinated silicone resin emulsion for concrete surface protection.

[0076] (6) Store the emulsion in a clean container and seal it.

[0077] The mass ratio of the materials in each step is as follows: 5.8 g of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, 17.4 g of isooctyltriethoxysilane, 0.64 g of Span80, 0.96 g of peregrine O, 10 g of deionized water, 0.2 g of PEG2000, 0.2 g of silicone defoamer, and 4.8 g of silicone acrylic emulsion.

[0078] Comparative Example 1:

[0079] Provided are an isooctyltriethoxysilane emulsion for concrete surface protection prepared by a prior art method and a preparation method thereof, which is different from Example 1 in that 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, silicone acrylic emulsion and silicone defoamer are omitted, and the material composition is based on the mass ratio of 60g of isooctyltriethoxysilane, 6.4g of Span80, 1.6g of Peregal O, 31g of deionized water, and 1g of PEG2000, and the rest is the same as Example 1.

[0080] Comparative Example 2:

[0081] Provided are an octyl fluorine-containing silicone resin emulsion for concrete surface protection and a preparation method thereof, which differs from Example 1 in that isooctyltriethoxysilane is omitted, and the material composition is 24 g of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane, and the rest is the same as Example 1.

[0082] Comparative Example 3:

[0083] Provided are an octyl fluorine-containing silicone resin emulsion for concrete surface protection and a preparation method thereof, which differs from Example 1 in that the material composition comprises 12 g of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane and 12 g of isooctyltriethoxysilane, and the rest is the same as Example 1.

[0084] Comparative Example 4:

[0085] Provided are an octyl fluorine-containing silicone resin emulsion for concrete surface protection and a preparation method thereof, which differs from Example 1 in that the silicone-acrylic emulsion is omitted, and the rest is the same as Example 1.

[0086] The emulsions prepared in Examples 1-3 and Comparative Example 1 were applied at a single coating of 300 g / m 2 , apply it twice on the concrete surface at an interval of 1h, and test the water absorption and penetration depth according to the provisions of T / CCES12-2020 on the test methods for silane emulsions.

[0087] The test results of various embodiments and comparative examples are shown in Table 1.

[0088] Table 1 Test results of octyl fluorine-containing silicone resin emulsions of Examples 1 to 3 and Comparative Examples 1 to 4

[0089]

[0090] Compared with Examples 1 to 3, Comparative Examples 1 to 4 adjusted the material composition and addition ratio. It can be seen from Table 1 that the emulsion stability of Examples 1 to 3 is better than that of Comparative Examples 2 to 4. Compared with Comparative Example 1, the water absorption rate of Examples 1 to 3 is further reduced by 2% to 10%, and the penetration depth is about 2 to 3 times that of Comparative Example 1.

[0091] Among them, in Examples 1 to 3, octyl fluorinated silicone resin emulsion is used to protect concrete. Compared with the protection of isooctyltriethoxysilane emulsion prepared by prior art in Comparative Example 1, 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane is added to the octyl fluorinated silicone resin emulsion, and the fluorinated functional groups contained in the octyltriethoxysilane have lower surface energy than the methyl functional groups contained in isooctyltriethoxysilane, and the hydrophobic effect is stronger, thereby improving the hydrophobicity of the concrete surface after protection.

[0092] During the preparation process of the emulsion of the present invention, silicone acrylic emulsion is added, so that the octyl fluorine-containing organic silicone resin emulsion can generate silicone resin after acting on the concrete surface, thereby reducing the fluidity of the emulsion, enhancing the adhesion of the emulsion, and achieving a deeper hydrophobic impregnation depth; at the same time, the silicone resin also blocks the pores and micro cracks within a certain depth range on the concrete surface, reducing the path for water to enter the interior of the concrete, making the water absorption rate smaller and the reduction degree greater, and still having a considerable penetration depth and water absorption rate reduction effect for C50 concrete with a higher degree of density.

[0093] Compared with Example 1, in Comparative Examples 2 to 4, after changing the material composition and ratio, the prepared octyl fluorinated silicone resin emulsion becomes unstable and cannot form an emulsion. In Comparative Example 2, since 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane is both hydrophobic and oleophobic, emulsification alone prevents it from combining with Span80 to form a uniform oil phase, and an emulsion cannot be formed in the subsequent emulsion preparation. In Comparative Example 3, isooctyl triethoxysilane allows 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane and Span80 to generate a uniform oil phase, but affected by the ratio of the two silanes, the emulsion agglomerates after the oil phase is added dropwise to the aqueous phase, resulting in the inability to form an emulsion. In Comparative Example 4, the blending ratio of 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane is determined, and an emulsion can be formed, but the stability of the emulsion is extremely poor. Therefore, after adding the silicone acrylic emulsion during the preparation of the emulsion in Example 1, the problem of easy stratification and poor stability of the octyl fluorinated organic silicone resin emulsion for concrete surface protection in Comparative Example 4 was effectively solved.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An octyl fluorine-containing silicone resin emulsion, characterized in that: In parts by weight, the following raw materials are included: 3-4 parts of emulsifier, 0.5-1 parts of polyethylene glycol, 0.3-0.5 parts of silicone defoamer, 10-12 parts of silicone-acrylic emulsion, 25-30 parts of water, 55-60 parts of silane; The emulsifier is composed of peregrine O and Span80 in a mass ratio of 1.22 to 1.71:1; the silane is composed of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane and isooctyltriethoxysilane in a mass ratio of 1:

3.

2. The octyl fluorine-containing silicone resin emulsion according to claim 1, characterized in that: The polyethylene glycol is PEG2000; Or, the organosilicon defoamer is organosilicon defoamer AFE-1410; Or, the silicone-acrylic emulsion is silicone-acrylic emulsion BF-400B.

3. A method for preparing the octyl fluorine-containing silicone resin emulsion according to claim 1 or 2, characterized in that: The steps include: 1H,1H,2H,2H-perfluorooctyltriethoxysilane, isooctyltriethoxysilane and Span80 were uniformly mixed to obtain oil phase A; Mixing perchlorate O, polyethylene glycol, silicone defoamer and water to obtain aqueous phase B; Under stirring conditions of 35-40° C. and 700-800 r / min, add the oil phase A to the water phase B and emulsify for 5-15 min to obtain emulsion C; Add the silicone acrylic emulsion to emulsion C and mix well, then emulsify for 4 to 5 hours at 35 to 40° C. and 2000 to 2400 r / min of stirring to obtain the product.

4. The method for preparing the octyl fluorine-containing silicone resin emulsion according to claim 3, characterized in that: Prepare oil phase A at 35-40°C and 700-800 r / min stirring conditions; Alternatively, the aqueous phase B is prepared at 35-40° C. and 700-800 r / min of stirring.

5. The method for preparing the octyl fluorine-containing silicone resin emulsion according to claim 3, characterized in that: The water is deionized water.

6. The method for preparing the octyl fluorine-containing silicone resin emulsion according to claim 3, characterized in that: Add the oil phase A to the water phase B at a uniform speed, and the addition time is 5 to 15 minutes; Alternatively, add the silicone acrylic emulsion into emulsion C at a uniform speed, and maintain the addition time at 5 to 10 minutes.

7. Use of the octyl fluorine-containing silicone resin emulsion according to claim 1 or 2 in concrete surface protection.

8. The use according to claim 7, characterized in that: The concrete surface protection is concrete surface waterproofing.

9. The use according to claim 7, characterized in that: The method for protecting the concrete surface is: coating the octyl fluorine-containing silicone resin emulsion on the concrete surface at least twice.

10. The use according to claim 9, characterized in that: The amount of the octyl fluorine-containing silicone resin emulsion applied in a single application is 250 to 350 g / m 2 .

11. The use according to claim 9, characterized in that: The amount of the octyl fluorine-containing silicone resin emulsion applied in a single application is 280-320 g / m 2 .

12. The use according to claim 9, characterized in that: The interval between two adjacent coatings is 50 to 70 minutes.

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