Self-leveling capillary crystalline waterproof coating and preparation method thereof

Abstract

The invention discloses a self-leveling capillary crystalline waterproof coating and a preparation method thereof, the waterproof coating comprises a component A and a component B, the component A comprises water and polyvinyl alcohol, the component B comprises cement, quartz sand, an active crystalline chemical substance and tartaric acid, and the component A and the component B are respectively prepared during preparation; uniformly mixing the components in the component A to obtain the component A; uniformly mixing the components in the component B to obtain the component B, and mixing the component A and the component B during use; the waterproof coating can independently complete sufficient permeation of active crystalline substances through self-water-locking without a maintenance process, can improve the waterproof performance of a concrete base layer, can form a self-waterproof layer, can seal a ventilation channel between concrete and the outside, prevents construction bubbles of a next waterproof or decorative coating from being generated, and improves the waterproof performance of the concrete base layer. In addition, the leveling agent has excellent self-leveling performance and can easily achieve the leveling function on a concrete foundation, for example, waterproof coiled materials can be directly laid on the leveling agent, and extra operations such as polishing and leveling are not needed.

Description

[0001] This invention is a divisional application of a Chinese invention patent application with an application date of April 28, 2023, application number 2023104737177, and name “A self-leveling penetrating crystalline waterproof coating and its application”. Technical Field

[0002] The invention relates to the technical field of waterproof materials, and in particular to a self-leveling penetrating crystallization waterproof coating and a preparation method thereof. Background Art

[0003] Cement-based penetrating crystalline waterproof coating is a powdered rigid waterproof material made of cement, quartz sand, etc. as base materials and mixed with active chemical substances. When used, it is mixed with water to form a slurry and applied to the base surface of the cement concrete structure. After curing, a rigid adhesion coating is formed on the surface of the concrete structure. Under ideal conditions, the active chemical substances contained in the coating penetrate into the concrete through the penetrating water carrier, catalyzing the silicates in the concrete to produce water-insoluble crystals, filling and blocking the capillary pores and micro cracks, thereby making the concrete dense and achieving the purpose of enhancing the anti-seepage performance and waterproof protection. However, the current penetrating crystalline waterproof coating has at least the following problems after application:

[0004] First, the coating formed by brushing is easy to powderize. On the one hand, the active crystalline substance cannot fully penetrate into the concrete base. The concrete base is not dense and has many pores, which poses a risk of leakage. At the same time, the residual gas in the pores is also easy to cause bubbles during the construction of the next waterproof or decorative coating. On the other hand, the coating after brushing cannot form its own waterproof function and needs to rely on the concrete material in the foundation structure to produce waterproof function.

[0005] Second, after the coating is formed by brushing, additional maintenance is required (usually about a week, the purpose of maintenance is to provide sufficient time and replenish carrier water so that the active crystalline substance can fully penetrate into the concrete base). If maintenance is not performed, the next process, such as laying waterproof membranes, will be carried out directly. After the waterproof membranes are laid, it will be difficult for the lower coating to obtain additional water. The existing coatings themselves are easy to lose water powder. The lack of carriers will also cause the active crystalline substances to be unable to fully penetrate into the concrete base. Therefore, the existing penetrating crystalline waterproof coatings basically need to be maintained, which makes the construction period longer;

[0006] Third, after the coating formed by brushing of existing paints is maintained, when it is necessary to proceed to the next process, such as laying waterproof membranes, it is also necessary to perform leveling treatment. Otherwise, insufficient flatness will easily cause gaps to form between the waterproof membranes and the coating, causing water leakage. Summary of the invention

[0007] The purpose of the present invention is to overcome one or more deficiencies in the prior art and to provide an improved method for preparing a penetrating crystallization waterproof coating and a waterproof coating made therefrom, wherein the waterproof coating can not only achieve sufficient penetration of active crystalline substances by itself without the need for a maintenance process through self-locking water, thereby improving the waterproof performance of the concrete base layer and forming its own waterproof layer, but also can seal the ventilation channel between the concrete and the outside to prevent the generation of bubbles during the construction of the next waterproof or decorative coating, and also has excellent self-leveling performance, and can easily achieve a leveling function for the concrete foundation, facilitating the subsequent application and construction of other materials, such as directly laying waterproof membranes without the need for additional grinding and leveling operations.

[0008] In order to achieve the above object, a technical solution adopted by the present invention is:

[0009] A method for preparing a self-leveling penetrating crystallization waterproof coating, the waterproof coating comprising component A and component B, wherein component A comprises water, and the preparation method comprises:

[0010] Preparation of Component A:

[0011] Calculated by mass percentage, the component A further comprises 10%-20% of polyvinyl alcohol, and the component A does not contain other film-forming resins except polyvinyl alcohol; the degree of polymerization of the polyvinyl alcohol is 400-2000, and the degree of alcoholysis is greater than 70%;

[0012] Mixing the components in the component A to obtain the component A;

[0013] Preparation of component B:

[0014] The component B comprises cement, quartz sand, active crystalline chemical substances and tartaric acid, and the tartaric acid in the component B accounts for 0.1%-0.8% by weight;

[0015] Mixing the components in the component B to obtain the component B;

[0016] Wherein, in the waterproof coating, the mass ratio of the component A to the component B is 1:0.6-1.

[0017] Another technical solution provided by the present invention is a self-leveling penetrating crystalline waterproof coating, which comprises component A and component B, wherein component A comprises water, and component B comprises a base material and an active crystalline chemical substance, wherein: in terms of mass percentage, component A further comprises 10%-20% of polyvinyl alcohol (PVA), and component A does not contain any other film-forming resin except polyvinyl alcohol;

[0018] Calculated by mass percentage, the component B further comprises 0.1%-0.8% of tartaric acid.

[0019] According to some preferred aspects of the present invention, in terms of mass percentage, polyvinyl alcohol accounts for 15%-20% in component A; and in terms of mass percentage, tartaric acid accounts for 0.2%-0.6% in component B.

[0020] According to some preferred aspects of the present invention, the degree of polymerization of the polyvinyl alcohol is 400-2000, and the degree of alcoholysis is greater than 70%.

[0021] According to some preferred aspects of the present invention, the polyvinyl alcohol is composed of a first polyvinyl alcohol and a second polyvinyl alcohol, the feed mass ratio of the first polyvinyl alcohol to the second polyvinyl alcohol is 0.8-2:1, the polymerization degree of the first polyvinyl alcohol is 1500-2000, and the alcoholysis degree is 75%-95%; the polymerization degree of the second polyvinyl alcohol is 500-800, and the alcoholysis degree is 98%-100%.

[0022] According to some preferred aspects of the present invention, the active crystalline chemical substance is composed of 1000-1500 mesh metakaolin, 3500-4500 mesh metakaolin and 600-1000 mesh silica fume, and the mass ratio of the 1000-1500 mesh metakaolin, the 3500-4500 mesh metakaolin and the 600-1000 mesh silica fume is 2.5-3.5:0.6-1.2:1.

[0023] According to some preferred aspects of the present invention, the feed mass ratio of the component A to the component B is 1:0.6-1.

[0024] According to some preferred aspects of the present invention, the component A comprises, by mass percentage, 10%-20% polyvinyl alcohol, 78%-90% water, 0-1% defoaming agent, and 0-1% preservative.

[0025] Furthermore, in terms of mass percentage, the component A comprises 15%-20% polyvinyl alcohol, 78%-84% water, 0.05-1% defoaming agent, and 0.05-1% preservative.

[0026] In some embodiments of the present invention, the defoaming agent includes: one or more of mineral oils, polyethers and polysiloxanes.

[0027] In some embodiments of the present invention, the preservative includes: one or more of isothiazolinones, substituted aromatic hydrocarbons, and organic amines.

[0028] According to some preferred aspects of the present invention, the base material comprises cement and quartz sand;

[0029] In terms of mass percentage, the component B comprises 30%-35% cement, 30%-50% quartz sand, 15%-35% active crystalline chemical substances, 0.1%-0.8% tartaric acid, 0.1%-0.25% polycarboxylate water reducer, and 0.05%-0.2% bentonite.

[0030] In some embodiments of the present invention, the polycarboxylate water reducer includes: one or two of BASF 2651F and Sika 325C.

[0031] Another technical solution provided by the present invention is an application of the self-leveling penetrating crystalline waterproof coating described above to prepare a waterproof coating on a concrete base surface.

[0032] According to some preferred aspects of the present invention, after the self-leveling penetrating crystalline waterproof coating described above is applied to the concrete base surface to form a waterproof coating, the curing process and the leveling process are omitted, and the process of laying the waterproof membrane is directly carried out.

[0033] Another technical solution provided by the present invention is a method for preparing the self-leveling penetrating crystallization waterproof coating described above, the preparation method comprising:

[0034] Preparation of component A: Mix the components in component A to obtain;

[0035] Preparation of component B: Mix the components in component B to obtain;

[0036] The waterproof coating can be obtained by mixing component A and component B according to the formula ratio.

[0037] In some embodiments of the present invention, during the preparation of component A, each component in component A is weighed according to the formula, added into a temperature-controlled stirring kettle, and stirred at 600-1000 rpm for 40-60 minutes at a water temperature of 85-95°C.

[0038] In some embodiments of the present invention, during the preparation of component B, the components in component B are weighed according to the formula, and 40%-60% of cement, 40%-60% of quartz sand, and 40%-60% of 1200 mesh kaolin are sequentially added into a horizontal dry mortar mixer, and then other ingredients except cement, quartz sand and 1200 mesh kaolin are added, and stirring is continued, and the remaining cement, the remaining quartz sand, and the remaining 1200 mesh kaolin are added, and stirred and mixed to obtain the product.

[0039] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0040] Based on the problems existing in existing permeable crystallization waterproof coatings, the inventors of the present invention provide a method that solves the problems of existing permeable crystallization waterproof coatings, such as easy powderization, requiring separate maintenance, and the formed coating requiring additional grinding and leveling treatment. The present invention innovatively uses polyvinyl alcohol as a film-forming resin of component A independently, and controls its addition amount, and simultaneously adds tartaric acid to component B, so that the permeable crystallization waterproof coating of the present invention not only has good self-leveling properties, but also has a self-locking water function, preventing the problem of active crystallization chemicals lacking water channels to penetrate and modify the base concrete after curing without sprinkling water. And polyvinyl alcohol is used as a film-forming substance to form a water-retaining channel, realizing the function of permeable crystallization without maintenance. At the same time, it provides a structural layer with a certain mechanical strength, closes the ventilation channel between the concrete and the outside, and prevents the generation of bubbles during the construction of the next waterproof or decorative coating. The material of the present invention can realize the self-waterproof performance of the modified concrete structure and form a waterproof layer by itself. One material forms two waterproof structures, thereby improving the waterproof quality. In addition, the advantage of good self-leveling performance can also enable the waterproof coating to easily realize the leveling function of the concrete foundation, which is convenient for the subsequent application and construction of other materials. For example, the waterproof membrane can be directly laid without the need for additional grinding and leveling operations. DETAILED DESCRIPTION

[0041] The above scheme is further described below in conjunction with specific embodiments; it should be understood that these embodiments are used to illustrate the basic principles, main features and advantages of the present invention, and the present invention is not limited to the scope of the following embodiments; the implementation conditions adopted in the embodiments can be further adjusted according to specific requirements, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0042] Unless otherwise specified in the following examples, all raw materials are commercially available or prepared by conventional methods in the art.

[0043] Example 1

[0044] This example provides a self-leveling penetrating crystallization waterproof coating, which includes component A and component B. The mass ratio of component A to component B is 1:0.6. The specific raw material formula is shown in Table 1 below.

[0045] Table 1

[0046]

[0047]

[0048] The preparation method of the self-leveling penetrating crystallization waterproof coating comprises:

[0049] Preparation of component A: Weigh each component of component A, add it into a temperature-controlled stirring kettle, and stir it at 1000 rpm for 60 minutes at a water temperature of 90°C;

[0050] Preparation of component B: Weigh each component of component B, and sequentially add 50% of cement, 50% of quartz sand, and 50% of 1200-mesh metakaolin into a horizontal dry mortar mixer, then add other ingredients except cement, quartz sand, and 1200-mesh metakaolin, continue stirring, then add the remaining cement, the remaining quartz sand, and the remaining 1200-mesh metakaolin, stir and mix, and obtain;

[0051] The self-leveling penetrating crystalline waterproof coating can be obtained by mixing component A and component B according to the formula ratio.

[0052] Example 2

[0053] This example provides a self-leveling penetrating crystallization waterproof coating, which includes component A and component B. The mass ratio of component A to component B is 1:0.8. The specific raw material formula is shown in Table 2 below.

[0054] Table 2

[0055]

[0056]

[0057] The preparation method is the same as Example 1.

[0058] Example 3

[0059] This example provides a self-leveling penetrating crystallization waterproof coating, which includes component A and component B, and the mass ratio of component A to component B is 1:1.0. The specific raw material formula is shown in Table 3 below.

[0060] Table 3

[0061]

[0062] The preparation method is the same as Example 1.

[0063] Comparative Example 1

[0064] The method is basically the same as Example 1, except that in component A, all the polyvinyl alcohol is replaced by acrylate with the same mass percentage.

[0065] Comparative Example 2

[0066] The method is basically the same as Example 1, except that: in component A, "4% of polyvinyl alcohol PVA-1788 and 5% of polyvinyl alcohol BP-0599" are replaced with 9% of acrylate, that is, after adjustment, component A contains 4% of polyvinyl alcohol PVA-1788, 5% of polyvinyl alcohol BP-0599, 9% of acrylate, 81.5% of water, 0.3% of defoaming agent, and 0.2% of preservative.

[0067] Comparative Example 3

[0068] The method is basically the same as Example 1, except that: in component A, the amount of "polyvinyl alcohol" is reduced and the mass percentage of polyvinyl alcohol in component A is controlled to be 3%, and the amount of water is increased accordingly; after adjustment, polyvinyl alcohol PVA-1788 1%, polyvinyl alcohol BP-0599 2%, water 96.5%, defoamer 0.3%, and preservative 0.2%.

[0069] Comparative Example 4

[0070] The method is basically the same as Example 1, except that in component B, tartaric acid is replaced by citric acid of the same mass percentage.

[0071] Comparative Example 5

[0072] The process is basically the same as Example 1, except that the entire component A is replaced by water.

[0073] Performance Testing

[0074] 1. The performance tests of Examples 1-3 and Comparative Examples 1-5 were conducted according to the fluidity index of the standard JC / T985-2017 "cement-based self-leveling mortar for floor", and the form of damage was determined according to the performance test method in the standard GB 18445-2012 "cement-based penetrating crystalline waterproof material"; the powdering was determined by gently wiping the coating film with fingers after it was dried for 2-3 days to observe whether there was powdering and falling powder; the water lock was determined by testing the adhesion strength of the dry base surface for 7 days. The specific results are shown in Table 4.

[0075] Table 4

[0076]

[0077]

[0078] From the above, it can be seen that adding acrylic resin to component A has a great influence on secondary impermeability and hinders penetration crystallization. The content of PVA not only has a great influence on water locking performance and impermeability, but also significantly affects the self-leveling performance. Compared with Example 1, Comparative Example 5 replaces the entire A component with water, and a stratification phenomenon occurs.

[0079] 2. The waterproof coating prepared in the above Example 1 with component A and component B in the ratios of 1:0.6, 1:0.8 and 1:1 respectively was subjected to the following performance tests (dry environment preparation and curing). The specific results are shown in Table 5.

[0080] Table 5

[0081]

[0082]

[0083] From the above, it can be seen that as the addition ratio of component B increases, the self-leveling performance is less affected, and the anti-seepage pressure ratio of the coating with penetration crystallization is improved.

[0084] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

[0085] 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.

Claims

1. A method for preparing a self-leveling penetrating crystallization waterproof coating, the waterproof coating comprising component A and component B, wherein component A contains water, characterized in that: The preparation method comprises: Preparation of Component A: Calculated by mass percentage, the component A further comprises 10%-20% of polyvinyl alcohol, and the component A does not contain other film-forming resins except polyvinyl alcohol; the degree of polymerization of the polyvinyl alcohol is 400-2000, and the degree of alcoholysis is greater than 70%; Mixing the components in the component A to obtain the component A; Preparation of component B: The component B comprises cement, quartz sand, active crystalline chemical substances and tartaric acid, and the tartaric acid in the component B accounts for 0.1%-0.8% by weight; Mixing the components in the component B to obtain the component B; Wherein, in the waterproof coating, the mass ratio of the component A to the component B is 1:0.6-1.

2. The method for preparing the self-leveling penetrating crystallization waterproof coating according to claim 1, characterized in that: In the process of preparing the component A, each component in the component A is weighed according to the formula, added into a temperature-controlled stirring kettle, and stirred at 600-1000 rpm for 40-60 minutes at a water temperature of 85-95° C.

3. The method for preparing the self-leveling penetrating crystallization waterproof coating according to claim 1, characterized in that: In terms of mass percentage, the component A comprises 10%-20% polyvinyl alcohol, 78%-90% water, 0-1% defoaming agent, and 0-1% preservative; Furthermore, in terms of mass percentage, the component A comprises 15%-20% polyvinyl alcohol, 78%-84% water, 0.05-1% defoaming agent, and 0.05-1% preservative.

4. The method for preparing the self-leveling penetrating crystallization waterproof coating according to claim 1 or 3, characterized in that: The polyvinyl alcohol is composed of a first polyvinyl alcohol and a second polyvinyl alcohol, the feed mass ratio of the first polyvinyl alcohol to the second polyvinyl alcohol is 0.8-2:1, the polymerization degree of the first polyvinyl alcohol is 1500-2000, and the alcoholysis degree is 75%-95%; the polymerization degree of the second polyvinyl alcohol is 500-800, and the alcoholysis degree is 98%-100%.

5. The method for preparing the self-leveling penetrating crystallization waterproof coating according to claim 1, characterized in that: The active crystalline chemical substance is composed of 1000-1500 mesh metakaolin, 3500-4500 mesh metakaolin, and 600-1000 mesh silica fume, and the mass ratio of the 1000-1500 mesh metakaolin, the 3500-4500 mesh metakaolin, and the 600-1000 mesh silica fume is 2.5-3.5:0.6-1.2:1; In the process of preparing component B, each component in component B is weighed according to the formula, and 40%-60% of cement, 40%-60% of quartz sand, and 40%-60% of metakaolin are sequentially added into a horizontal dry mortar mixer, and then other ingredients except cement, quartz sand and metakaolin are added, and stirring is continued. Then, the remaining cement, the remaining quartz sand, and the remaining metakaolin are added, and stirred and mixed to obtain the product.

6. The method for preparing the self-leveling penetrating crystallization waterproof coating according to claim 1, characterized in that: In terms of mass percentage, the component B comprises 30%-35% cement, 30%-50% quartz sand, 15%-35% active crystalline chemical substances, 0.1%-0.8% tartaric acid, 0.1%-0.25% polycarboxylate water reducer, and 0.05%-0.2% bentonite.

7. The method for preparing the self-leveling penetrating crystallization waterproof coating according to claim 1, characterized in that: In terms of mass percentage, the polyvinyl alcohol in the component A accounts for 15%-20%; in terms of mass percentage, the tartaric acid in the component B accounts for 0.2%-0.6%.

8. The method for preparing the self-leveling penetrating crystallization waterproof coating according to claim 1, characterized in that: When in use, the component A and the component B are mixed according to the formula ratio to obtain a self-leveling penetrating crystalline waterproof coating, and after the self-leveling penetrating crystalline waterproof coating is applied on the concrete base surface to form a waterproof coating, the curing process and the leveling process are omitted, and the process of covering the waterproof membrane is directly carried out.

9. A self-leveling penetrating crystalline waterproof coating made by the preparation method of the self-leveling penetrating crystalline waterproof coating according to any one of claims 1 to 8; the water locking property of the self-leveling penetrating crystalline waterproof coating can reach 1.2MPa and does not powder.

10. A self-leveling penetrating crystallization waterproof coating, characterized in that: The self-leveling penetrating crystallization waterproof coating comprises component A and component B; The component A comprises water and polyvinyl alcohol, and the component A does not contain any other film-forming resin except the polyvinyl alcohol; the polyvinyl alcohol in the component A accounts for 10%-20% by weight; the polyvinyl alcohol is composed of a first polyvinyl alcohol and a second polyvinyl alcohol, the feed mass ratio of the first polyvinyl alcohol to the second polyvinyl alcohol is 0.8-2:1, the first polyvinyl alcohol has a degree of polymerization of 1500-2000, and a degree of alcoholysis of 75%-95%; the second polyvinyl alcohol has a degree of polymerization of 500-800, and a degree of alcoholysis of 98%-100%; The component B comprises cement, quartz sand, active crystalline chemical substances and tartaric acid; in terms of mass percentage, the tartaric acid in the component B accounts for 0.1%-0.8%; The mass ratio of the component A to the component B is 1:0.6-1.

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