CN112080203A

CN112080203A - Waterproof coating for aga soil and preparation method thereof

Info

Publication number: CN112080203A
Application number: CN202010953843.9A
Authority: CN
Inventors: 朱孟轩; 张良培; 张晖; 蒋震宇; 张忠
Original assignee: National Center for Nanosccience and Technology China
Current assignee: National Center for Nanosccience and Technology China
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2020-12-15

Abstract

The invention provides a waterproof coating for aga soil and a preparation method thereof. The waterproof coating for aga soil comprises the following raw materials in percentage by mass: 50-80% of organic silicon, 2-5% of silane coupling agent, 0.1-1% of silane coupling agent modified nano particles, 0.05-0.1% of catalyst and the balance of low-boiling organic solvent. The waterproof coating is coated on the surface of the agaga soil to form a waterproof coating with a micro-nano structure, and the waterproof coating has good long-acting property while meeting the requirements of hydrophobicity and air permeability and has no great influence on the original appearance and texture of the agaga soil.

Description

Waterproof coating for aga soil and preparation method thereof

Technical Field

The invention belongs to the technical field of waterproof coatings, particularly relates to a waterproof coating and a preparation method thereof, and particularly relates to a waterproof coating for aga soil and a preparation method thereof.

Background

Agatu is a unique building material in the Tibet region, and mainly contains calcium carbonate, silicon dioxide and a proper amount of clay-containing siliceous limestone. Tibetan important ancient buildings such as the Bodalla palace, Sakyamu temple, Apocynum venetum, Guge ancient city and the like, roofs, wall surfaces and floors are generally built by using Alga soil. The main manufacturing process is that the aga raw soil with different grain sizes and water are mixed into slurry, and the slurry is rammed repeatedly by a special pestle, and after the slurry is completely concreted, the pebbles are used for polishing and flattening, and then the sheepskin is dipped in butter for repeated polishing to obtain the aga raw soil. The rammed aga soil has smooth and beautiful surface and rich national characteristics, and the manufacturing process is listed in non-material cultural heritage.

The aga soil material has low strength and poor waterproof performance, and the internal viscous material is easy to be washed away by rainwater, becomes rough and cracks under the weather conditions of sunshine, rain, wind erosion and freeze thawing, thereby causing the damage of civil cultural relics. The main diseases of many important cultural relics in Tibet, including ancient buildings and murals, are closely related to aga civil engineering materials. The agatu roof must be maintained frequently, and particularly, the roof and the part of the open-air place must be drained smoothly, and the crack which appears must be repaired or repaired immediately. The aga soil thickness is also increasing due to constant patching. The thickened rammed earth layer further increases the whole load of the original building, so that the building structure is deformed and unevenly settled, the roof is further cracked, and a vicious circle is formed. The agatu roof, wall and ground are generally required to be renovated once every three years, which causes huge waste. Some research has been carried out on the water protection of agata soil, but for various reasons no extensive use has been obtained. The problem that how to carry out waterproof treatment on the aga soil in the existing building on the premise of not changing the appearance of the aga soil is still an urgent need to be solved.

CN102108220A discloses a building material waterproofing agent, in particular to an organosilicon waterproofing agent and a preparation method thereof. An organosilicon waterproofing agent is characterized in that: the composition is obtained by cracking organic silicon resin obtained by hydrogen-containing silicone oil under the action of strong base in an organic solvent and then separating. However, the silicone waterproofing agent of the present invention can be used only in general concrete constructions, and has a limited waterproofing effect against agate soil, which contains calcium carbonate and silica as main components, and it is difficult to form a firm coating film.

Therefore, the development of a waterproof coating material which can not change the appearance of agana soil in the existing buildings and has excellent waterproof effect is the focus of current research in the field.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a waterproof coating and a preparation method thereof, in particular to a waterproof coating for agana and a preparation method thereof. The waterproof coating can ensure that the appearance of the aga soil in the existing building is not changed, and simultaneously has long-acting excellent waterproof effect.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a waterproof coating for agana, which comprises the following raw materials in percentage by mass: 50-80% of organic silicon, 2-5% of silane coupling agent, 0.1-1% of silane coupling agent modified nano particles, 0.05-0.1% of catalyst and the balance of low-boiling organic solvent.

In the waterproof coating material of the present invention, the organosilicon has hydrophobic non-polar group and Si-H group can produce dehydrogenation reaction with hydroxyl on the surface of agana soil to form chemical bond. Meanwhile, the silane coupling agent is used for modifying the nano particles, so that the compatibility of the nano particles and the organic coating is improved on one hand, and the introduction of the silane coupling agent enables the hydrogen-containing silicone oil to react with the agasoil more easily on the other hand. The waterproof coating with the micro-nano structure can be formed on the aga soil surface by brushing. A large number of experiments and field investigation prove that the waterproof coating has good long-acting property while meeting the requirements of hydrophobicity and air permeability, and has no great influence on the original appearance and texture of the agana soil.

The content of the silicone is 50 to 80%, for example, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, etc., based on 100% of the raw material for preparing the waterproof coating material for agata soil.

The silane coupling agent content is 2 to 5% based on 100% of the raw material for preparing the waterproof coating material for agana, and may be, for example, 2%, 2.2%, 2.4%, 2.6%, 2.8%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, or the like.

The content of the silane coupling agent modified nanoparticles is 0.1 to 1%, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc., based on 100% of the raw material for preparing the waterproof coating material for agana.

The content of the catalyst is 0.05 to 0.1%, for example, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.1%, or the like, based on 100% of the raw material for preparing the waterproof coating material for agana.

Preferably, the silicone is a hydrogen-containing silicone oil.

Preferably, the hydrogen content of the hydrogen-containing silicone oil is 1.0 wt% or more, and may be, for example, 1.0 wt%, 1.1 wt%, 1.2 wt%, 1.3 wt%, 1.4 wt%, 1.5 wt%, 1.6 wt%, 1.7 wt%, 1.8 wt%, 1.9 wt%, 2.0 wt%, etc., preferably 1.6 wt%.

Preferably, the silane coupling agent is selected from any one of KH550, KH560 or KH570 or a combination of at least two thereof.

Preferably, the silane coupling agent modified nanoparticles are prepared from the following raw materials: silane coupling agent, nano-particles, alcohol solvent and water.

Preferably, the mass ratio of the silane coupling agent, the nanoparticles, the alcohol solvent and the water is (1-3): (10-30): (10-30): 1-3), and may be, for example, 1:10:10:1, 2:10:1, 3:10:10:1, 1:20:10:1, 2:20:10:1, 3:20:10:1, 1:10:20:1, 2:10:20:1, 3:10:20:1, 1:10:10:3, 2:10:10:3, 3:10:10:3, 1:20:20:1, 2:20:20:1, 3:20:20: 20:1, etc.

Preferably, the nanoparticles are nano-titania.

Preferably, the particle size of the nano titanium dioxide is 1 to 100nm, and may be, for example, 1nm, 5nm, 10nm, 15nm, 20nm, 25nm, 30nm, 35nm, 40nm, 45nm, 50nm, 55nm, 60nm, 65nm, 70nm, 75nm, 80nm, 85nm, 90nm, 95nm, 100nm, or the like.

Preferably, the alcoholic solvent is selected from ethanol and/or isopropanol.

Preferably, the silane coupling agent modified nanoparticles are prepared by the following preparation method:

(a) mixing and stirring a silane coupling agent, an alcohol solvent and water to obtain a silane coupling agent dispersion liquid;

(b) mixing and stirring the silane coupling agent dispersion liquid obtained in the step (a) and the nano particles, filtering and drying to obtain the silane coupling agent modified nano particles.

Preferably, in step (a), the temperature of the mixing and stirring is 10-30 ℃, for example, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃ and the like, and the time of the mixing and stirring is 1-3h, for example, 1h, 1.5h, 2h, 2.5h, 3h and the like.

Preferably, in the step (b), the temperature of the mixing and stirring is 10-30 ℃, for example, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃ and the like, and the time of the mixing and stirring is 1-3h, for example, 1h, 1.5h, 2h, 2.5h, 3h and the like;

preferably, in step (b), the drying temperature is 90-110 ℃, such as 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃ and the like, and the drying time is 5-7h, such as 5h, 5.5h, 6h, 6.5h, 7h and the like.

Preferably, the catalyst is selected from any one of chloroplatinic acid, stannous octoate, dibutyltin dilaurate or dibutyltin diacetate or a combination of at least two of the above.

The boiling point of the low-boiling organic solvent is preferably 100 ℃ or lower, and may be, for example, 20 ℃, 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ or the like.

Preferably, the low-boiling organic solvent is selected from any one of ethanol, isopropanol, ethyl acetate or acetonitrile or a combination of at least two of the above, preferably ethanol.

In a second aspect, the present invention provides a method for preparing a waterproof coating material for agana as described in the first aspect, the method comprising the steps of:

(1) dissolving organic silicon in a low-boiling-point organic solvent, and mixing and stirring the organic silicon, a catalyst and the low-boiling-point organic solvent to obtain a mixed solution;

(2) and (2) mixing and dispersing silane coupling agent modified nano particles and the pre-reaction liquid obtained in the step (1) to obtain the waterproof coating for agasoil.

Preferably, the temperature of the mixing and stirring in the step (1) is 10-30 ℃, for example, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃ and the like, and the time of the mixing and stirring is 5-20min, for example, 5min, 6min, 8min, 10min, 12min, 14min, 16min, 18min, 20min and the like.

Preferably, the dispersion in step (2) is ultrasonic dispersion, the power of the ultrasonic dispersion is 200-400W, such as 200W, 250W, 300W, 350W, 400W and the like, and the time of the ultrasonic dispersion is 20-40min, such as 20min, 22min, 24min, 26min, 28min, 30min, 32min, 34min, 36min, 38min, 40min and the like.

Preferably, the preparation method of the waterproof coating for agana comprises the following steps:

(1) dissolving organic silicon in a low-boiling-point organic solvent, mixing and stirring the organic silicon with a catalyst and the low-boiling-point organic solvent at 10-30 ℃ for 5-20min to obtain a mixed solution;

(2) and (2) mixing the silane coupling agent modified nano particles with the pre-reaction liquid obtained in the step (1), and performing ultrasonic dispersion for 20-40min at the power of 200-400W to obtain the waterproof coating for aga soil.

The coating method used for the waterproof coating material of the present invention is not particularly limited, and specifically includes roll coating, spray coating, brush coating, etc., the drying temperature after coating is controlled to 20 ℃ or higher, for example, 20 ℃, 25 ℃, 30 ℃, 35 ℃, etc., the drying time is controlled to 10 days or longer, for example, 10 days, 12 days, 14 days, 16 days, 18 days, 20 days, etc., and the ambient humidity for drying is controlled to 50% or lower, for example, 10%, 20%, 30%, 40%, 50%, etc. In addition, because the waterproof coating has long drying time, proper protection measures should be taken to prevent the drying process from being polluted by the environment.

Compared with the prior art, the invention has the following beneficial effects:

(1) the waterproof coating is coated on the surface of the aga soil, and the Si-H group and hydroxyl on the surface of the aga soil are subjected to dehydrogenation reaction to form a chemical bond, so that a waterproof coating with a micro-nano structure is formed, and the waterproof coating meets the requirements of hydrophobicity and air permeability, has good long-acting property and has no great influence on the original appearance and texture of the aga soil;

(2) the waterproof coating has excellent super-hydrophobic performance, namely, the contact angle of the waterproof coating with water drops is more than 140 degrees, and the rolling angle is less than 15 degrees; the waterproof coating has excellent permeability in the aga soil, and can permeate to the position which is more than 20mm below the surface of the aga soil; the waterproof coating has good adhesive force with the aga soil, the transparent adhesive tape is pasted on the surface of the coating for many times, the contact angle is still kept at about 140 degrees, and the reduction rate is below 2 percent.

Drawings

FIG. 1 is a graph showing the contact angle of the water-repellent paint according to the present invention on the surface of a coating layer formed on the surface of agana soil;

FIG. 2 is a graph of the surface topography of agatu under an electron microscope.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

FIG. 1 is a contact angle diagram of a coating surface formed on a agana surface by the waterproof coating of the present invention, and as shown in FIG. 1, the waterproof coating of the present invention has excellent superhydrophobic performance. FIG. 2 is the surface topography of agatu under an electron microscope, as shown in FIG. 2, agatu is formed by stacking flaky particle monomers. The gaps in the stacked structure can be regarded as the pores of the aga soil material and are basically through holes, so that the coating disclosed by the invention can permeate in the aga soil, and the surface can be regarded as a micro-nano structure to provide conditions for super-hydrophobicity.

The sources of the raw materials in the following examples are as follows: hydrogen-containing silicone oil (hydrogen content 1.6 wt%, available from jinan xing fei long chemical company, ltd.), nano titanium dioxide (available from jiwan special chemical (shanghai) ltd.), and silane coupling agent (available from beijing blue yi chemical product ltd.).

Preparation example 1

The preparation example provides a silane coupling agent modified nanoparticle I, which is prepared by the following preparation method:

(a) uniformly mixing 200mg of isopropanol and 20mg of deionized water, adding 20mg of silane coupling agent KH570, and fully stirring for 2 hours at 25 ℃ to obtain silane coupling agent dispersion liquid;

(b) adding 200mg of nano TiO into the silane coupling agent dispersion liquid obtained in the step (a)₂Fully stirring the mixture for 2 hours at the temperature of 25 ℃, filtering the mixture, and drying the mixture for 6 hours in a drying oven at the temperature of 100 ℃ to obtain the silane coupling agent modified nano-particles I.

Preparation example 2

The preparation example provides a silane coupling agent modified nanoparticle II, which is prepared by the following preparation method:

(a) uniformly mixing 200mg of isopropanol and 20mg of deionized water, adding 20mg of silane coupling agent KH550, and fully stirring at 25 ℃ for 2 hours to obtain silane coupling agent dispersion liquid;

(b) adding 200mg of nano TiO into the silane coupling agent dispersion liquid obtained in the step (a)₂Fully stirring the mixture for 2 hours at the temperature of 25 ℃, filtering the mixture, and drying the mixture for 6 hours in a drying oven at the temperature of 100 ℃ to obtain the silane coupling agent modified nano-particles II.

Preparation example 3

The preparation example provides a silane coupling agent modified nanoparticle III, which is prepared by the following preparation method:

(a) uniformly mixing 200mg of isopropanol and 20mg of deionized water, adding 20mg of silane coupling agent KH560, and fully stirring at 25 ℃ for 2 hours to obtain silane coupling agent dispersion liquid;

(b) adding 200mg of nano TiO into the silane coupling agent dispersion liquid obtained in the step (a)₂Fully stirring the mixture for 2 hours at the temperature of 25 ℃, filtering the mixture, and drying the mixture for 6 hours in a drying oven at the temperature of 100 ℃ to obtain the silane coupling agent modified nano-particle III.

Preparation example 4

The preparation example provides a silane coupling agent modified nanoparticle IV, which is prepared by the following preparation method:

(a) uniformly mixing 200mg of isopropanol and 20mg of deionized water, adding 5mg of silane coupling agent KH570, and fully stirring at 25 ℃ for 2 hours to obtain silane coupling agent dispersion liquid;

(b) adding 200mg of nano TiO into the silane coupling agent dispersion liquid obtained in the step (a)₂Fully stirring the mixture for 2 hours at the temperature of 25 ℃, filtering the mixture, and drying the mixture for 6 hours in a drying oven at the temperature of 100 ℃ to obtain the silane coupling agent modified nano-particles IV.

Preparation example 5

The preparation example provides a silane coupling agent modified nanoparticle V, which is prepared by the following preparation method:

(a) uniformly mixing 200mg of isopropanol and 20mg of deionized water, adding 40mg of silane coupling agent KH570, and fully stirring for 2 hours at 25 ℃ to obtain silane coupling agent dispersion liquid;

(b) adding 200mg of nano TiO into the silane coupling agent dispersion liquid obtained in the step (a)₂Fully stirring the mixture for 2 hours at the temperature of 25 ℃, filtering the mixture, and drying the mixture for 6 hours in a drying oven at the temperature of 100 ℃ to obtain the silane coupling agent modified nano-particle V.

Example 1

This example provides a waterproof coating for agana prepared by the following preparation method:

(1) weighing 20g of hydrogen-containing silicone oil with the hydrogen content of 1.6 wt%, adding the hydrogen-containing silicone oil into 20g of absolute ethyl alcohol, uniformly mixing, adding 40mg of dibutyltin dilaurate and 0.8g of KH550, and mixing and stirring at 25 ℃ for 10min to obtain a mixed solution;

(2) and (2) adding 50mg of silane coupling agent modified nano particles I into the mixed solution obtained in the step (1), and performing ultrasonic dispersion, wherein the power of the ultrasonic dispersion is 300W, and the time of the ultrasonic dispersion is 30min, so as to obtain the waterproof coating for aga soil.

Example 2

(1) weighing 24g of hydrogen-containing silicone oil with the hydrogen content of 1.6 wt%, adding the hydrogen-containing silicone oil into 16g of absolute ethyl alcohol, uniformly mixing, adding 40mg of dibutyltin dilaurate and 0.8g of KH550, and mixing and stirring at 25 ℃ for 10min to obtain a mixed solution;

Example 3

(1) weighing 20g of hydrogen-containing silicone oil with the hydrogen content of 1.6 wt%, adding the hydrogen-containing silicone oil into 10g of absolute ethyl alcohol, uniformly mixing, adding 40mg of dibutyltin dilaurate and 1.2g of KH550, and mixing and stirring at 25 ℃ for 10min to obtain a mixed solution;

Example 4

This example provides a water-resistant coating for agana, which differs from example 1 only in that the silane coupling agent modified nanoparticle I is replaced with an equal mass of silane coupling agent modified nanoparticle II (KH550 modified), and the contents of other components and preparation method are the same as those of example 1.

Example 5

This example provides a water-resistant coating for agana, which differs from example 1 only in that the silane coupling agent modified nanoparticle I is replaced with an equal mass of silane coupling agent modified nanoparticle III (KH560 modification), and the contents of other components and preparation method are the same as those of example 1.

Example 6

This example provides a waterproof coating material for agana, which is different from example 1 only in that silane coupling agent modified nanoparticles I are replaced with silane coupling agent modified nanoparticles IV of equal mass, and the contents of other components and preparation method are the same as example 1.

Example 7

This example provides a waterproof coating material for agana, which is different from example 1 only in that silane coupling agent modified nanoparticles I are replaced with silane coupling agent modified nanoparticles V of equal mass, and the contents of other components and the preparation method are the same as example 1.

Example 8

This example provides a water-resistant coating material for agana, differing from example 1 only in that the hydrogen content of the hydrogen-containing silicone oil is 0.8 wt%.

Comparative example 1

The present comparative example provides a waterproof coating material for agana prepared by the following preparation method:

(1) weighing 20g of epoxy resin (with a solid content of 45 wt% and purchased from Beijing Lange chemical products, Ltd.), adding the epoxy resin into 20g of absolute ethyl alcohol for uniform mixing, adding 40mg of dibutyltin dilaurate and 0.8g of KH550, and mixing and stirring at 25 ℃ for 10min to obtain a mixed solution;

Comparative example 2

(1) weighing 20g of hydrogen-containing silicone oil with the hydrogen content of 1.6 wt%, adding the hydrogen-containing silicone oil into 20g of absolute ethyl alcohol, uniformly mixing, adding 40mg of dibutyltin dilaurate, and mixing and stirring at 25 ℃ for 10min to obtain a mixed solution;

(2) and (2) adding 50.8mg of silane coupling agent modified nano particles I into the mixed solution obtained in the step (1), and performing ultrasonic dispersion, wherein the ultrasonic dispersion power is 300W, and the ultrasonic dispersion time is 30min to obtain the waterproof coating for aga soil.

Comparative example 3

(1) weighing 20g of hydrogen-containing silicone oil with the hydrogen content of 1.6 wt%, adding the hydrogen-containing silicone oil into 20g of absolute ethyl alcohol, uniformly mixing, adding 40mg of dibutyltin dilaurate and 2g of KH550, and mixing and stirring at 25 ℃ for 10min to obtain a mixed solution;

(2) 50mg of nano TiO is taken₂And (2) adding the mixture into the mixed solution obtained in the step (1), and performing ultrasonic dispersion, wherein the power of the ultrasonic dispersion is 300W, and the time of the ultrasonic dispersion is 30min to obtain the waterproof coating for aga soil.

Performance testing

The waterproof paint for agata soil prepared in the above examples 1 to 8 and the waterproof paint for agata soil prepared in the comparative examples 1 to 3 were uniformly brushed on the outer surface of agata soil by a brush coating method, the brush coating was continued for 2 times after the surface liquid was substantially infiltrated, the paint was dried at 25 ℃ for 10 days, and the waterproof property test was performed on each coat after the drying, and the specific test method was as follows:

(1) contact angle, roll angle: the contact angle and the rolling angle are measured under a DSA100 optical contact angle measuring instrument, the contact angle is measured by 4 mu L of liquid drops, and the rolling angle is measured by 8 mu L of liquid drops;

(2) penetration depth: immersing one surface of aga soil in the coating, splitting after 24 hours to obtain a cross section, taking 10 points on average to measure the penetration depth, and calculating the average value;

(3) adhesion force: the transparent adhesive tape is pasted on the surface of the coating for 100 times, and the contact angle of the pasted coating is tested, so that the smaller the change degree of the contact angle is, the better the adhesive force of the coating is proved;

the specific test results are shown in table 1:

TABLE 1

As shown in the test data in Table 1, the waterproof coating has excellent super-hydrophobic performance, namely, the contact angle of the waterproof coating with water drops is more than 140 degrees, and the rolling angle is less than 15 degrees; the waterproof coating has excellent permeability in the aga soil, and can permeate to the position which is more than 20mm below the surface of the aga soil; the waterproof coating has good adhesive force with the aga soil, the transparent adhesive tape is pasted on the surface of the coating for many times, the contact angle is still kept at about 140 degrees, and the reduction rate is below 2 percent. The waterproof coating is coated on the surface of the agaga soil, and the Si-H group and hydroxyl on the surface of the agaga soil are subjected to dehydrogenation reaction to form a chemical bond, so that the waterproof coating with a micro-nano structure is formed, and the waterproof coating meets the requirements of hydrophobicity and air permeability, has good long-acting property and has no great influence on the original appearance and texture of the agaga soil.

As can be seen from a comparison of example 1 and comparative example 1, the coating prepared by replacing the silicone with the epoxy resin was low in hydrophobic property and permeability because it failed to react with the hydroxyl groups on the agana surface to form a tight chemical bond. As can be seen from the comparison of example 1 and comparative example 2, it is difficult to further increase the hydrophobicity of the waterproof coating layer even if the content of the silane coupling agent-modified nanoparticles is increased without adding a silane coupling agent (i.e., without free silane coupling agent in the coating). From the comparison between example 1 and comparative example 3, it can be seen that unmodified nano TiO was added₂On the one hand, the compatibility of the nano-particles and the organic coating is poor, and on the other hand, the reaction of Si-H group of hydrogen-containing silicone oil and hydroxyl on the surface of aga soil can not be promoted well, so that the nano-particles are formedThe waterproof coating cannot meet the requirement of hydrophobicity.

The applicant states that the present invention is illustrated by the above examples to the waterproof coating material for agana and the preparation method thereof, but the present invention is not limited to the above examples, that is, it does not mean that the present invention must be implemented by the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims

1. The waterproof coating for agata soil is characterized by comprising the following preparation raw materials in percentage by mass: 50-80% of organic silicon, 2-5% of silane coupling agent, 0.1-1% of silane coupling agent modified nano particles, 0.05-0.1% of catalyst and the balance of low-boiling organic solvent.

2. The water-repellent paint for agana according to claim 1, wherein the silicone is a hydrogen-containing silicone oil;

preferably, the hydrogen content of the hydrogen-containing silicone oil is more than 1.0 wt%, and preferably 1.6 wt%.

3. The waterproof coating material for agana according to claim 1 or 2, wherein the silane coupling agent is selected from any one of KH550, KH560 or KH570 or a combination of at least two thereof.

4. The waterproof coating material for agana according to any one of claims 1 to 3, wherein the silane coupling agent-modified nanoparticles are prepared from the following raw materials: silane coupling agent, nano-particles, alcohol solvent and water;

preferably, the mass ratio of the silane coupling agent to the nanoparticles to the alcohol solvent to the water is (1-3) to (10-30) to (1-3);

preferably, the silane coupling agent is selected from any one of KH550, KH560 or KH570 or a combination of at least two thereof;

preferably, the nanoparticles are nano-titania;

preferably, the particle size of the nano titanium dioxide is 1-100 nm;

preferably, the alcoholic solvent is selected from ethanol and/or isopropanol.

5. The waterproof coating material for agana according to any one of claims 1 to 4, wherein the silane coupling agent-modified nanoparticles are prepared by the following preparation method:

(b) mixing and stirring the silane coupling agent dispersion liquid obtained in the step (a) and the nano particles, filtering and drying to obtain silane coupling agent modified nano particles;

preferably, in the step (a), the temperature of the mixing and stirring is 10-30 ℃, and the time of the mixing and stirring is 1-3 h;

preferably, in the step (b), the temperature of the mixing and stirring is 10-30 ℃, and the time of the mixing and stirring is 1-3 h;

preferably, in step (b), the drying temperature is 90-110 ℃, and the drying time is 5-7 h.

6. The water repellent coating for agana according to any one of claims 1 to 5, wherein said catalyst is selected from any one of chloroplatinic acid, stannous octoate, dibutyltin dilaurate or dibutyltin diacetate, or a combination of at least two thereof.

7. The water repellent paint for agana according to any one of claims 1 to 6, wherein the low-boiling organic solvent has a boiling point of 100 ℃ or lower;

8. The method for preparing a waterproof coating material for agana according to any one of claims 1 to 7, characterized by comprising the steps of:

9. The preparation method according to claim 8, wherein the temperature of the mixing and stirring in the step (1) is 10 to 30 ℃, and the time of the mixing and stirring is 5 to 20 min;

preferably, the dispersion in the step (2) is ultrasonic dispersion, the power of the ultrasonic dispersion is 200-400W, and the time of the ultrasonic dispersion is 20-40 min.

10. The production method according to claim 8 or 9, characterized in that the production method of the waterproof coating material for agana comprises the steps of: