Composition for inorganic waterproof material, inorganic waterproof material and preparation method and application thereof

Abstract

The invention relates to the field of waterproof coatings, and discloses a composition for an inorganic waterproof material, an inorganic waterproof material, and a preparation method and application thereof. The composition for an inorganic waterproof material contains a silicate solution, aluminum sulfate, a silica sol aqueous solution, a defoamer, and a preservative, wherein the silicate solution is a combination of a sodium silicate aqueous solution and a lithium silicate aqueous solution in a mass ratio of 1:0.12-0.24. The inorganic waterproof coating provided by the invention can improve the waterproofness and impermeability of concrete.

Description

Technical Field

[0001] The present invention relates to the field of waterproof coatings, and in particular to a composition for inorganic waterproof materials, an inorganic waterproof material, and a preparation method and application thereof. Background Art

[0002] Penetrating crystalline inorganic waterproof material is a water-based product. After being sprayed on the surface of concrete, it will penetrate 20-30mm into the concrete, react chemically with the free alkali in the concrete, and generate stable dendrite-like crystalline substances, which effectively block the pores in the concrete and form an effective waterproof layer inside the concrete. It can also enhance the hardness of the concrete, improve the pressure resistance, wear resistance and toughness of the concrete surface, and improve the concrete's resistance to cracking.

[0003] However, the permeable crystallization type inorganic waterproof material has the disadvantages of poor permeable crystallization degree, poor aging resistance and poor impermeability / anti-water penetration pressure ratio.

[0004] CN 115286429 A discloses an anticorrosive water-based penetrating inorganic waterproofing agent, comprising the following components in parts by weight: 30-40 parts of silicate, 5-8 parts of catalyst, 3-6 parts of organosilicon, 1-3 parts of preservative, 0.5-1 parts of early strength agent, 0.1-0.3 parts of algaecide, 0.05-0.1 parts of surfactant, and 40-50 parts of water; the preservative comprises potassium tripolyphosphate and aluminum sulfate. The silicate is a mixed solution of sodium silicate aqueous solution, potassium silicate aqueous solution and lithium silicate aqueous solution.

[0005] Therefore, it is urgent to develop an inorganic waterproof coating that can improve the waterproofness and impermeability of concrete. Summary of the invention

[0006] The purpose of the present invention is to provide an inorganic waterproof coating that can improve the waterproofness and impermeability of concrete.

[0007] In order to achieve the above object, one aspect of the present invention provides a composition for an inorganic waterproof material, the composition comprising a silicate solution, aluminum sulfate, a silica sol aqueous solution, a defoaming agent, and a preservative;

[0008] The silicate solution is a combination of a sodium silicate aqueous solution and a lithium silicate aqueous solution in a mass ratio of 1:0.12-0.24;

[0009] Based on the total mass of the composition, the content of the silicate solution is 75-92wt%, the content of the aluminum sulfate is 2-6wt%, the content of the silica sol aqueous solution calculated as silicon dioxide is 0.3-5wt%, the content of the defoamer is 0.5-0.8wt%, and the content of the preservative is 1-3wt%;

[0010] The silica sol aqueous solution has a silicon dioxide content of 25-35 wt %, an average particle diameter of 10-50 nm, and a pH value of 8-11;

[0011] The lithium silicate aqueous solution has a solid content of 20-25wt%, a modulus of 4.5-5, and a pH of 11-12;

[0012] The sodium silicate aqueous solution has a solid content of 20-25 wt %, a modulus of 35-40, and a pH value of 9-11.

[0013] The second aspect of the present invention provides a method for preparing an inorganic waterproof coating, comprising contacting and mixing the components in the inorganic waterproof material composition in the presence of water to obtain the inorganic waterproof coating;

[0014] The inorganic waterproof material composition is the inorganic waterproof material composition described in the first aspect.

[0015] The third aspect of the present invention provides an inorganic waterproof coating prepared by the method described in the second aspect.

[0016] The fourth aspect of the present invention provides the use of the inorganic waterproof coating described in the third aspect in concrete.

[0017] Through the above technical solution, the present invention has at least the following advantages:

[0018] (1) The inorganic waterproof coating provided by the present invention uses water as a dispersion medium, is non-toxic, non-irritating, and non-polluting, and can be sprayed on objects and walls using a spraying device (such as a portable, agricultural, electric pump, etc.) or a roller brush. At room temperature, the effect can be seen within 24 hours.

[0019] (2) The surface of an object treated with the inorganic waterproof coating provided by the present invention remains the same as the original surface without adding any gloss or color and without affecting the appearance of the original object. The application range is very wide.

[0020] (3) The inorganic waterproof coating provided by the present invention has excellent chemical corrosion resistance and can improve the pressure resistance, wear resistance and toughness of the concrete surface.

[0021] (4) The inorganic waterproof coating provided by the present invention can improve the waterproofness and impermeability of concrete. DETAILED DESCRIPTION

[0022] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0023] It should be noted that, in this article, room temperature refers to 25±3°C.

[0024] The standard environment refers to a temperature of 23±2℃ and a humidity of 50±10%RH.

[0025] As mentioned above, one aspect of the present invention provides a composition for an inorganic waterproof material, the composition comprising a silicate solution, aluminum sulfate, a silica sol aqueous solution, a defoaming agent, and a preservative;

[0026] The silicate solution is a combination of a sodium silicate aqueous solution and a lithium silicate aqueous solution in a mass ratio of 1:0.12-0.24;

[0027] Based on the total mass of the composition, the content of the silicate solution is 75-92wt%, the content of the aluminum sulfate is 2-6wt%, the content of the silica sol aqueous solution calculated as silicon dioxide is 0.3-5wt%, the content of the defoamer is 0.5-0.8wt%, and the content of the preservative is 1-3wt%;

[0028] The silica sol aqueous solution has a silicon dioxide content of 25-35 wt %, an average particle diameter of 10-50 nm, and a pH value of 8-11;

[0029] The lithium silicate aqueous solution has a solid content of 20-25wt%, a modulus of 4.5-5, and a pH of 11-12;

[0030] The sodium silicate aqueous solution has a solid content of 20-25 wt %, a modulus of 35-40, and a pH value of 9-11.

[0031] It should be noted that the content of the silica sol aqueous solution in terms of silicon dioxide in the present invention refers to the amount of silicon dioxide calculated after removing the water in the silica sol aqueous solution. For example, when the present invention uses a silica sol aqueous solution with a silicon dioxide content of 30wt%, and the amount of the silica sol aqueous solution is 5g, it means that the amount of the silica sol aqueous solution in terms of silicon dioxide is 1.5g.

[0032] Preferably, the content of aluminum sulfate is 2-4wt%. The inventors of the present invention unexpectedly found that in this preferred case, by selecting and compounding the remaining raw materials, the inorganic waterproof coating provided by the present invention can be applied to concrete to further improve the pressure resistance, wear resistance and toughness of the concrete surface.

[0033] More preferably, the effective ingredient content of the aluminum sulfate is ≥99.5wt%.

[0034] Preferably, the silicate solution is a combination of a sodium silicate aqueous solution and a lithium silicate aqueous solution in a weight ratio of 1:0.15-0.2. The inventors of the present invention have found that in this preferred embodiment, the inorganic waterproof coating provided by the present invention has stronger chemical corrosion resistance.

[0035] Preferably, the specific surface area of ​​silicon dioxide in the silica sol aqueous solution is 200-300m 2 The inventors of the present invention have found that, in this preferred case, spraying the inorganic waterproof coating provided by the present invention onto concrete can further improve the pressure resistance of the concrete surface.

[0036] Preferably, the defoaming agent is selected from at least one of a silicone defoaming agent and a mineral oil defoaming agent.

[0037] More preferably, the defoamer is an organosilicon defoamer. Further preferably, the defoamer is DA480, a commercial product of Guangzhou Kefeng Chemical Co., Ltd. The inventors of the present invention have found that in this preferred embodiment, the inorganic waterproof coating provided by the present invention has stronger chemical corrosion resistance.

[0038] Preferably, the bactericidal preservative is isothiazolinone. More preferably, the bactericidal preservative is MERGAL K14, a commercial product of Troy Company, USA.

[0039] As mentioned above, the second aspect of the present invention provides a method for preparing an inorganic waterproof coating, wherein the components in the inorganic waterproof material composition are contacted and mixed in the presence of water to obtain the inorganic waterproof coating;

[0040] The inorganic waterproof material composition is the inorganic waterproof material composition described in the first aspect.

[0041] Preferably, the silicate solution is a combination of a sodium silicate aqueous solution and a lithium silicate aqueous solution in a mass ratio of 1:0.12-0.24.

[0042] Preferably, based on the total mass of the composition, the amount of the silicate solution is 75-92wt%, the amount of the aluminum sulfate is 2-6wt%, the amount of the silica sol aqueous solution calculated as silicon dioxide is 0.3-5wt%, the amount of the defoamer is 0.5-0.8wt%, and the amount of the preservative is 1-3wt%.

[0043] More preferably, based on the total mass of the composition, the amount of the silicate solution is 75-92wt%, the amount of the aluminum sulfate is 2-4wt%, the amount of the silica sol aqueous solution calculated as silicon dioxide is 0.3-5wt%, the amount of the defoaming agent is 0.5-0.8wt%, and the amount of the preservative is 1-3wt%.

[0044] Preferably, based on the total amount of the water and the components in the inorganic waterproof material composition, the amount of the water is 80-90 wt%.

[0045] Preferably, the contact mixing conditions include: temperature of 5-40° C., time of 10-30 min, and rotation speed of 500-800 rpm.

[0046] According to a particularly preferred embodiment, the method further comprises, after the contact mixing, passing the mixture obtained by the contact mixing through a Chinese standard sieve of 80-200 mesh, taking the material under the sieve to obtain the inorganic waterproof coating.

[0047] As mentioned above, the third aspect of the present invention provides an inorganic waterproof coating prepared by the method described in the second aspect.

[0048] As mentioned above, the fourth aspect of the present invention provides the use of the inorganic waterproof coating described in the third aspect in concrete.

[0049] According to a particularly preferred embodiment, the method for applying the inorganic waterproof coating to concrete comprises:

[0050] S1: Clean the surface of the concrete building;

[0051] S2: spraying and / or brushing an inorganic waterproof coating onto the cleaned surface of the concrete building;

[0052] S3: Drying the concrete building that has been sprayed and / or brushed with inorganic waterproof coating.

[0053] The present invention has no special requirements for the cleaning method, and operations known in the art may be adopted. As long as the cleaning makes the surface of the building free of dust and moss, the inventor will not elaborate on this, and those skilled in the art should not understand it as a limitation of the present invention.

[0054] According to a preferred specific implementation manner, before the cleaning, the cracks and / or holes on the surface of the building are firstly filled and compacted with a crack repairing agent, and then the cleaning is performed.

[0055] Preferably, the method further comprises, in step S2, the spraying and / or brushing are performed in an alternating manner vertically and horizontally.

[0056] More preferably, the number of times of spraying and / or brushing is independently at least 2. The number of times of spraying and brushing is such that water marks appear on the cleaned concrete building surface.

[0057] Preferably, the amount of the inorganic waterproof coating sprayed or brushed once is 4-5m 2 / Kg.

[0058] It should be noted that, before the spraying and / or brushing, the cleaned concrete building is first dried. The present invention has no special requirements for the drying process, and the process steps known in the art can be used.

[0059] It should be noted that the application method of the inorganic waterproof coating provided by the present invention in concrete needs to stop construction when the ambient temperature is below 4°C, and spraying and / or brushing outdoor operations are not suitable on rainy days.

[0060] The present invention will be described in detail below by way of examples. In the following examples, unless otherwise specified, the instruments, reagents, materials, etc. involved are conventional instruments, reagents, materials, etc., which can be obtained through regular commercial channels.

[0061] Sodium silicate aqueous solution I: solid content 20wt%, modulus 35, pH value 10.5, purchased from Jinan Zesheng Chemical Co., Ltd.;

[0062] Sodium silicate aqueous solution II: solid content 15wt%, modulus 35, pH 9.8, purchased from Jinan Zesheng Chemical Co., Ltd.;

[0063] Lithium silicate aqueous solution I: solid content 22wt%, modulus 4.8, pH 11.5, purchased from Shandong Xinghai Chemical Co., Ltd.;

[0064] Lithium silicate aqueous solution II: solid content 21.5wt%, modulus 6.5, pH 11, purchased from Shandong Xinghai Chemical Co., Ltd.;

[0065] Potassium silicate aqueous solution, with a solid content of 21.5 wt %, a modulus of 4.8, and a pH of 11.5, was purchased from Shandong Xinghai Chemical Co., Ltd.;

[0066] Aluminum sulfate: active ingredient content 99.9wt%, purchased from Shandong Landing New Energy Technology Co., Ltd.;

[0067] Barium sulfate: active ingredient content 99wt%, purchased from Shanghai Huifan New Material Technology Co., Ltd.;

[0068] Silica sol aqueous solution I: The content of silicon dioxide is 30wt%, the average particle diameter is 10-16nm, the pH value is 10.5, and the specific surface area of ​​silicon dioxide is 250-270m 2 / g, purchased from Wuhan Jiyesheng Chemical Co., Ltd.;

[0069] Silica sol aqueous solution II: The content of silica is 25wt%, the average particle diameter is 10-16nm, the pH value is 9.5, and the specific surface area of ​​silica is 250-270m 2 / g, purchased from Wuhan Jiyesheng Chemical Co., Ltd.;

[0070] Silica sol aqueous solution III: The content of silicon dioxide is 15wt%, the average particle diameter is 10-16nm, the pH value is 9, and the specific surface area of ​​silicon dioxide is 250-270m 2 / g, purchased from Wuhan Jiyesheng Chemical Co., Ltd.;

[0071] Defoaming agent: organic silicon defoaming agent, brand DA480, purchased from Guangzhou Kefeng Chemical Co., Ltd.;

[0072] Preservative: isothiazolinone, brand name MERGAL K14, purchased from Troy Company, USA;

[0073] The silicate solution I is a combination of a sodium silicate aqueous solution I and a lithium silicate aqueous solution I in a mass ratio of 1:0.18;

[0074] Silicate solution II is a combination of sodium silicate aqueous solution I and lithium silicate aqueous solution I in a mass ratio of 1:0.20;

[0075] Silicate solution III is a combination of sodium silicate aqueous solution I and lithium silicate aqueous solution I in a mass ratio of 1:0.14;

[0076] The silicate solution IV is a combination of a sodium silicate aqueous solution I, a lithium silicate aqueous solution I and a potassium silicate aqueous solution in a mass ratio of 1:0.18:0.18;

[0077] The silicate solution V is a combination of a sodium silicate aqueous solution II and a lithium silicate aqueous solution I in a mass ratio of 1:0.18;

[0078] The silicate solution VI is a combination of the sodium silicate aqueous solution I and the lithium silicate aqueous solution II in a mass ratio of 1:0.18.

[0079] Example 1

[0080] Water is added into a stirring kettle, and then sodium silicate aqueous solution, lithium silicate aqueous solution, aluminum sulfate, silica sol aqueous solution, defoaming agent and preservative are added into the stirring kettle for contact mixing under stirring. The mixture obtained by contact mixing is passed through a 100-mesh Chinese standard sieve, and the material under the sieve is taken to obtain an inorganic waterproof coating T1.

[0081] The types, amounts and process parameters of the substances involved in this example are listed in Table 1.

[0082] Unless otherwise specified, the remaining examples are carried out in accordance with the method of Example 1, except that the raw materials and process parameters used in each example are different, and the specific details are shown in Table 1.

[0083] Table 1

[0084]

[0085]

[0086] Comparative Example 1

[0087] This comparative example is carried out in a similar manner to Example 1, except that the silicate solution I in Example 1 is replaced with an equal mass of silicate solution IV to obtain an inorganic waterproof coating DT-1.

[0088] Comparative Example 2

[0089] This comparative example was carried out in a similar manner to Example 1, except that aluminum sulfate was not added in this comparative example, and the amount of silicate solution I was adjusted to 90.5 g to obtain an inorganic waterproof coating DT-2.

[0090] Comparative Example 3

[0091] This comparative example is carried out in a similar manner to Example 1, except that the silica sol aqueous solution I in Example 1 is replaced with an equal mass of silica sol aqueous solution III to obtain an inorganic waterproof coating DT-3.

[0092] Comparative Example 4

[0093] This comparative example was carried out in a similar manner to Example 1, except that the content of aluminum sulfate in this comparative example was adjusted to 7 g, the amount of silicate solution I was 83.5 g, and the inorganic waterproof coating DT-4 was obtained.

[0094] Comparative Example 5

[0095] This comparative example is carried out in a similar manner to Example 1, except that the silicate solution I in Example 1 is replaced with an equal mass of silicate solution V to obtain an inorganic waterproof coating DT-5.

[0096] Comparative Example 6

[0097] This comparative example was carried out in a similar manner to Example 1, except that the aluminum sulfate in Example 1 was replaced with an equal mass of barium sulfate to obtain an inorganic waterproof coating DT-6.

[0098] Comparative Example 7

[0099] This comparative example is carried out in a similar manner to Example 1, except that the silicate solution I in Example 1 is replaced with an equal mass of silicate solution VI to obtain an inorganic waterproof coating DT-7.

[0100] Test Case

[0101] The surface tension, gelation time, storage stability, 10 cycles, impermeability (concrete penetration height ratio), frost resistance, heat resistance and alkali resistance of the inorganic waterproof coating obtained in the above example were tested using JC / T 1018-2020II type "Water-based penetrating inorganic waterproof agent". The specific results are shown in Table 2.

[0102] The impact resistance test method of inorganic waterproof coating is as follows: Apply the inorganic waterproof coating on the concrete surface (4.5m 2 / Kg), cured in a standard environment for 14 days, the cured concrete was placed closely under the standard sand with a thickness of 20mm, and then a spherical code with a diameter of 50mm and a weight of 530g was freely dropped from a height of 300mm onto the standard sand (the above test was repeated 3 times for each piece of cured concrete, and the selected points were at least 50mm apart), and the surface of the cured concrete was observed with the naked eye. The specific results are shown in Table 2.

[0103] In the aforementioned test method, the standard sand is used to act as a buffer, and it can also be understood that the spherical sand falls freely directly onto the cured concrete surface.

[0104] Table 2

[0105]

[0106]

[0107] Table 2

[0108]

[0109] It can be seen from the results in Table 2 that the inorganic waterproof coating provided by the present invention has strong chemical corrosion resistance and can improve the waterproofness, impermeability, pressure resistance, wear resistance and other properties of concrete.

[0110] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A composition for an inorganic waterproof material, It is characterized in that The composition contains silicate solution, aluminum sulfate, silica sol aqueous solution, defoamer and preservative; The silicate solution is a combination of a sodium silicate aqueous solution and a lithium silicate aqueous solution in a mass ratio of 1:0.12-0.24; Based on the total mass of the composition, the content of the silicate solution is 75-92wt%, the content of the aluminum sulfate is 2-6wt%, the content of the silica sol aqueous solution calculated as silicon dioxide is 0.3-5wt%, the content of the defoamer is 0.5-0.8wt%, and the content of the preservative is 1-3wt%; The silica sol aqueous solution has a silicon dioxide content of 25-35 wt %, an average particle diameter of 10-50 nm, and a pH value of 8-11; The lithium silicate aqueous solution has a solid content of 20-25wt%, a modulus of 4.5-5, and a pH of 11-12; The sodium silicate aqueous solution has a solid content of 20-25 wt %, a modulus of 35-40, and a pH value of 9-11.

2. The composition according to claim 1, in, The content of aluminum sulfate is 2-4wt%.

3. The composition according to claim 1 or 2, in, The silicate solution is a combination of a sodium silicate aqueous solution and a lithium silicate aqueous solution in a weight ratio of 1:0.15-0.

2.

4. A composition according to any one of claims 1 to 3, in, The specific surface area of ​​silicon dioxide in the silica sol aqueous solution is 200-300m 2 / g.

5. A composition according to any one of claims 1 to 4, in, The defoamer is an organosilicon defoamer.

6. A composition according to any one of claims 1 to 5, in, The preservative is isothiazolinone.

7. A method for preparing an inorganic waterproof coating, It is characterized in that In the presence of water, the components in the inorganic waterproof material composition are contacted and mixed to obtain the inorganic waterproof coating; The inorganic waterproof material composition is the inorganic waterproof material composition according to any one of claims 1 to 6.

8. The method according to claim 7, in, Based on the total amount of the water and the components in the inorganic waterproof material composition, the amount of the water is 80-90wt%; And / or, the contact mixing conditions include: temperature of 5-40° C., time of 10-30 min, and rotation speed of 500-800 rpm.

9. The inorganic waterproof coating prepared by the method according to claim 7 or 8.

10. Use of the inorganic waterproof coating according to claim 9 in concrete.

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