Waterproof coating repairing agent, preparation method thereof and waterproof coating

Abstract

The invention discloses a waterproof coating repairing agent, a preparation method thereof and a waterproof coating, and relates to the technical field of waterproof coatings. The waterproof coating repairing agent is prepared from the following components in parts by mass: 65 to 85 parts of acrylic emulsion, 5 to 10 parts of amino silicon oil emulsion, 0.02 to 0.1 part of organic weak acid and 0.5 to 2 parts of defoaming agent, wherein the acrylic emulsion comprises a first acrylic emulsion with the viscosity of 0-500 MPa * s at the temperature of 25 DEG C and a second acrylic emulsion with the viscosity of 1000-3000 MPa * s at the temperature of 25 DEG C. The waterproof coating comprises at least two polymer waterproof coating layers and a repairing agent layer arranged between the polymer waterproof coating layers. According to the waterproof coating designed by using the coating repairing agent, the water channeling phenomenon of the waterproof coating is reduced, and the waterproof service life of the coating is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof coatings, and in particular to a waterproof coating repair agent and a preparation method thereof, and a waterproof coating. Background Art

[0002] At present, a large number of buildings are mainly made of cement, sand and stone and other materials. Due to internal chemical reactions, physical mixing, human operation and other reasons, a large number of bubbles are inevitably introduced, and a large number of pores appear in the concrete base after complete drying. Rainwater or domestic water in the roof, balcony, bathroom, kitchen and other parts can easily penetrate into the base through these pores. After long-term erosion, these parts are prone to cracking, softening and other phenomena, affecting the life of the building.

[0003] Polymer waterproof coatings are used as excellent waterproof materials in these areas to extend the service life of buildings and protect people's property safety. However, this type of coating often has limited effect after one application, and it needs to be applied multiple times to reach a certain thickness to achieve the purpose of efficient waterproofing. Different coats of coating often have stratification due to surface contamination of the bottom coating, differences in surface tension between coatings, material compatibility, etc. Eventually, moisture enters between the coatings, destroying the material properties and affecting the service life. In addition, in order to achieve a certain coating thickness of the waterproof coating, the coating needs to maintain a certain viscosity. However, when the waterproof coating is applied on a relatively dry concrete base, the coating is filled with pores and cracks due to the water absorption of the base, and the waterproof effect of the coating is significantly reduced. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, the first aspect of the present invention provides a waterproof coating repair agent, which comprises, by weight:

[0006] 65-85 parts of acrylic emulsion, 5-10 parts of amino silicone oil emulsion, 0.02-0.1 parts of organic weak acid, 0.5-2 parts of defoaming agent;

[0007] The acrylic emulsion comprises: a first acrylic emulsion with a viscosity of 0 MPa·s to 500 MPa·s at 25°C and a second acrylic emulsion with a viscosity of 1000 MPa·s to 3000 MPa·s at 25°C.

[0008] Furthermore, in the waterproof coating repair agent, the first acrylic emulsion accounts for 55 to 65 parts by mass, and the second acrylic emulsion accounts for 10 to 20 parts by mass.

[0009] Furthermore, the particle size of the first acrylic emulsion is not greater than 0.4 μm, and the particle size of the second acrylic emulsion is not greater than 0.4 μm.

[0010] Furthermore, the mass content of silicone in the amino silicone oil emulsion is 30% to 40%; the organic weak acid is citric acid; and the defoamer is a polyether defoamer.

[0011] The second aspect of the present invention provides a method for preparing the above-mentioned waterproof coating repair agent, comprising:

[0012] According to the mass fraction of the waterproof coating repair agent, the amino silicone oil emulsion is added to the first acrylic emulsion and stirred, then the second acrylic emulsion is slowly added dropwise and stirred continuously, and finally the defoaming agent and the organic weak acid are added and stirred again.

[0013] A third aspect of the present invention provides a waterproof coating, comprising: at least two polymer waterproof coating layers, and a repair agent layer disposed between the polymer waterproof coating layers;

[0014] Wherein, the repair agent layer is obtained by coating the above-mentioned waterproof coating repair agent.

[0015] Furthermore, the polymer waterproof coating layer is selected from at least one of an ethylene-vinyl acetate waterproof coating layer, an acrylic waterproof coating layer, an acrylic ester waterproof coating layer, an acrylic polymer cement waterproof coating layer and an acrylic ester polymer cement waterproof coating layer.

[0016] Furthermore, the dry film thickness of the polymer waterproof coating layer is 0.5 mm to 1 mm, and the dry film thickness of the repair agent layer is 0.05 mm to 0.15 mm.

[0017] Furthermore, the waterproof coating consists of a first polymer waterproof coating layer as a bottom layer, a repair agent layer in the middle, and a second polymer waterproof coating layer as an upper layer; wherein the dry film thickness of the first polymer waterproof coating layer is 0.7mm to 0.9mm, the dry film thickness of the repair agent layer is 0.08mm to 0.12mm, and the dry film thickness of the second polymer waterproof coating layer is 0.6mm to 0.8mm.

[0018] Furthermore, the repair agent layer can improve the compatibility between the first polymer waterproof coating layer and the second polymer waterproof coating layer, so that the bonding strength of the waterproof coating is greater than 1.30MPa, the tensile strength is greater than 2.0MPa, the elongation at break is greater than 60%, and it remains waterproof for 30 minutes under a water pressure of 0.3MPa and passes the water penetration test.

[0019] Compared with the prior art, the waterproof coating repair agent provided by the present invention has at least the following beneficial effects:

[0020] (1) It can effectively improve the compatibility between polymer waterproof coating layers, avoid the influence of dust, oil and other factors, and cause the coating to split and water seepage. (2) It can effectively penetrate into the tiny pores of the polymer waterproof coating layer, block the pores and improve the waterproof effect of the coating. (3) It can effectively remove the influence of dust and oil on the polymer waterproof coating layer and improve the connection performance between the polymer waterproof coating layers. Avoid the occurrence of polymer waterproof coating layer splitting and water seepage problems. (4) The amino silicone oil emulsion in the repair agent, the amino group on the siloxane chain end can chemically react with the ester group in the polymer waterproof coating layer and some hydroxyl groups in cement, to improve the cross-linking between the repair agent and the polymer waterproof coating layer, and improve the adhesion between the polymer waterproof coating layers. At the same time, the use of amino silicone oil emulsion can effectively improve the problem of poor water resistance of the repair agent.

[0021] In summary, the waterproof coating designed using the waterproof coating repair agent provided by the present invention can reduce the occurrence of water seepage in the coating and improve the waterproof life and effect of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a performance diagram of the waterproof coating provided in Example 1 of the present application after a water penetration simulation test.

[0023] Figure 2 This is a performance diagram of the waterproof coating provided in Comparative Example 1 of the present application after a water penetration simulation test. DETAILED DESCRIPTION

[0024] In order to better understand the above technical solution, the technical solution of the present invention is described in detail below through specific embodiments.

[0025] A first aspect of an embodiment of the present invention provides a waterproof coating repair agent, which comprises, in parts by mass:

[0026] 65-85 parts of acrylic emulsion, 5-10 parts of amino silicone oil emulsion, 0.02-0.1 parts of organic weak acid, and 0.5-2 parts of defoaming agent; wherein the acrylic emulsion includes: a first acrylic emulsion with a viscosity of 0MPa·s to 500MPa·s at 25°C and a second acrylic emulsion with a viscosity of 1000MPa·s to 3000MPa·s at 25°C.

[0027] Optionally, in the waterproof coating repair agent, the first acrylic emulsion accounts for 55 to 65 parts by mass, and the second acrylic emulsion accounts for 10 to 20 parts by mass.

[0028] Preferably, the waterproof coating repair agent includes, in parts by mass: 55-65 parts of a first acrylic emulsion, 10-20 parts of a second acrylic emulsion, 5-8 parts of an amino silicone oil emulsion, 0.02-0.05 parts of an organic weak acid, and 0.5-1 parts of a defoaming agent.

[0029] Optionally, since the first acrylic emulsion, the second acrylic emulsion and the amino silicone oil emulsion are all water-based emulsions, a proper amount of water may be added when preparing the waterproof coating repair agent, and the amount of water added is 0 to 20 parts by mass.

[0030] The waterproof coating repair agent provided by the embodiment of the present invention is mainly used between the layers of the polymer waterproof coating to improve the compatibility between the polymer waterproof coatings. The main components are the first acrylic emulsion, the second acrylic emulsion, the amino silicone oil emulsion, the organic weak acid and the defoaming agent. Among them, the first acrylic emulsion, as the main supporting material, can form a cross-linked film when applied on the polymer waterproof coating to improve the compactness of the polymer waterproof coating; on the other hand, it can penetrate into the pores of the polymer waterproof coating, block the pores, and improve the waterproof effect of the polymer waterproof coating. The second acrylic emulsion, due to its high viscosity, can effectively remove the influence of dust and oil on the polymer waterproof coating when it acts on the polymer waterproof coating, and improve the linking performance between the polymer waterproof coatings according to its own viscosity, avoiding the occurrence of the splitting and water leakage problems of the polymer waterproof coating. As a bridging agent and water-resistant agent, the amino group on the siloxane chain end of the amino silicone oil emulsion can react chemically with the ester group in the polymer waterproof coating and some hydroxyl groups in the cement, thereby improving the cross-linking between the repair agent and the coating, as well as the adhesion between the coatings; at the same time, the use of the amino silicone oil emulsion can effectively improve the problem of poor water resistance of the repair agent. As a catalyst, organic weak acid can provide protons to effectively ensure the cross-linking reaction between the amino group on the amino silicone oil and the ester group in the polymer waterproof coating and some hydroxyl groups in the cement. As an auxiliary material, the defoamer is mainly used to eliminate air bubbles in the repair agent to improve the density of the coating.

[0031] In a feasible implementation, the particle size of the first acrylic emulsion is no greater than 0.4 μm, and the particle size of the second acrylic emulsion is no greater than 0.4 μm.

[0032] Specifically, the particle sizes of the first acrylic emulsion and the second acrylic emulsion used are both no greater than 0.4 μm. Due to their smaller particle sizes, they can penetrate into tiny pores and cracks in the coating, repair the coating, improve the water repellent effect of the coating, and reduce the occurrence of water seepage in the coating.

[0033] In a feasible implementation manner, the mass content of silicone in the amino silicone oil emulsion is 30% to 40%; the organic weak acid is citric acid; and the defoaming agent is a polyether defoaming agent.

[0034] It is understandable that amino silicone oil emulsions with different silicone contents have an effect on the self-crosslinking of the coating. Our experiments have found that amino silicone oil emulsions with a silicone mass content of 30%-40% have the best self-crosslinking effect on the coating. The organic weak acid is preferably citric acid. The defoamer is preferably a polyether defoamer, because compared with silicone defoamers or mineral oil defoamers, polyether defoamers are not affected by temperature and pH value and have strong defoaming ability. At the same time, they can enhance the tensile strength and elongation at break of the waterproof coating after film formation to a certain extent.

[0035] A second aspect of an embodiment of the present invention provides a method for preparing the above-mentioned waterproof coating repair agent, comprising:

[0036] According to the mass fraction of the above waterproof coating repair agent, the amino silicone oil emulsion is added to the first acrylic emulsion and stirred, and then the second acrylic emulsion is slowly added dropwise and continued to be stirred, and finally the defoaming agent and organic weak acid are added and stirred again.

[0037] The preparation method of the waterproof coating repair agent provided by the embodiment of the present invention is simple and feasible, and only requires physical mixing without involving a synthetic reaction.

[0038] A third aspect of an embodiment of the present invention provides a waterproof coating, comprising: at least two polymer waterproof coating layers, and a repair agent layer disposed between the polymer waterproof coating layers;

[0039] Wherein, the repair agent layer is obtained by coating with the above-mentioned waterproof coating repair agent.

[0040] Specifically, the polymer waterproof coating layer is obtained by brushing the polymer waterproof coating, and the polymer waterproof coating layer needs to be brushed multiple times. The polymer waterproof coating is brushed onto the base layer, and the dry film thickness of the polymer waterproof coating layer is controlled to be 0.5-1 mm, and then the repair agent layer is brushed, and the dry film thickness of the repair agent layer is controlled to be 0.05-0.15 mm, and then the polymer waterproof coating layer is brushed again on the repair agent layer, and the dry film thickness of the polymer waterproof coating layer is still controlled to be 0.5-1 mm. It can be understood that when the polymer waterproof coating layer is three layers and the repair agent layer is two layers, from bottom to top, it is the base layer, the first polymer waterproof coating layer, the first repair agent layer, the second polymer waterproof coating layer, the second repair agent layer and the third polymer waterproof coating layer. The waterproof coating designed using the coating repair agent of the present invention achieves the effect of reducing the occurrence of water leakage in the coating and improving the waterproof life of the coating. Among them, the polymer waterproof coating layer is selected from at least one of ethylene-vinyl acetate waterproof coating layer, acrylic waterproof coating layer, acrylic ester waterproof coating layer, acrylic polymer cement waterproof coating layer and acrylic ester polymer cement waterproof coating layer.

[0041] As a preferred embodiment, the waterproof coating consists of a first polymer waterproof coating layer as a bottom layer, a repair agent layer in the middle, and a second polymer waterproof coating layer as an upper layer; wherein the dry film thickness of the first polymer waterproof coating layer is 0.7mm to 0.9mm, the dry film thickness of the repair agent layer is 0.08mm to 0.12mm, and the dry film thickness of the second polymer waterproof coating layer is 0.6mm to 0.8mm.

[0042] In summary, the repair agent layer can improve the compatibility between the first polymer waterproof coating layer and the second polymer waterproof coating layer, so that the bonding strength of the waterproof coating is greater than 1.30MPa, the tensile strength is greater than 2.0MPa, the elongation at break is greater than 60%, and it remains waterproof for 30 minutes under a water pressure of 0.3MPa, passes the water penetration test, and remains flat without water leakage after long-term immersion in rainwater.

[0043] Below, the waterproof coating repair agent and waterproof coating of the present application are introduced in detail through examples and comparative examples. The reagents used in the examples and comparative examples are as follows: the first acrylic emulsion is BASF 3002, with a particle size of 0.28-0.32 microns; the second acrylic emulsion is BASF 7260, with a particle size of 0.28-0.32 microns; the amino silicone oil emulsion is Dow Corning DC-949, with a silicone weight percentage content of 35%; the citric acid is a product of Suzhou Zhuosheng Environmental Protection Technology Co., Ltd., with a citric acid content of 99%; the defoamer is Guangdong Zhonglian Fine Chemical Co., Ltd. B-299, a polyether defoamer.

[0044] Example 1

[0045] (1) Waterproof coating repair agent

[0046] The invention comprises: 650g of a first acrylic emulsion, 100g of a second acrylic emulsion, 50g of an amino silicone oil emulsion, 0.5g of citric acid, and 5g of a polyether defoamer. The first acrylic emulsion has a viscosity of 0MPa·s to 500MPa·s at 25°C, and the second acrylic emulsion has a viscosity of 1000MPa·s to 3000MPa·s at 25°C.

[0047] (II) Preparation method of waterproof coating repair agent

[0048] Weigh 650g of the first acrylic emulsion and add it to the liquid material mixing tank, turn on the disperser, and keep the speed at 600r / min-750r / min; then in the first step, add 200g of water and 50g of amino silicone oil emulsion to the emulsion system respectively, and stir for 5min; in the second step, weigh 100g of the second acrylic emulsion, and then slowly drop it into the above system, and stir for 10min; in the third step, slowly drop 5g of polyether defoamer and 0.5g of citric acid into the above system, and stir for 5min. Finally, stir the whole for 5min to obtain the repair agent.

[0049] (III) Waterproof coating

[0050] The waterproof coating consists of three layers: the bottom layer is a polymer waterproof coating layer formed by an acrylic waterproof coating film, the middle layer is a repair agent layer formed by a repair agent film of this embodiment, and the upper layer is a polymer waterproof coating layer formed by an acrylic waterproof coating film. The bottom layer has a thickness of 0.8 mm (dry film thickness), the middle layer has a thickness of 0.1 mm (dry film thickness), the upper layer has a thickness of 0.7 mm (dry film thickness), and the total thickness of the waterproof coating is 1.6 mm.

[0051] (IV) Performance test: The waterproof coating was prepared according to the requirements of the standard GB / T 23445-2009 "Polymer cement waterproof coating", and the waterproofing, mechanical properties, and adhesion properties were tested. In addition, in order to verify the mutual adhesion between the coatings, the water penetration of the waterproof coating was verified, as shown in Table 1. Figure 1 shown.

[0052] Example 2

[0053] (1) Waterproof coating repair agent

[0054] The invention comprises: 650g of a first acrylic emulsion, 150g of a second acrylic emulsion, 80g of an amino silicone oil emulsion, 0.5g of citric acid, and 5g of a polyether defoamer. The first acrylic emulsion has a viscosity of 0MPa·s to 500MPa·s at 25°C, and the second acrylic emulsion has a viscosity of 1000MPa·s to 3000MPa·s at 25°C.

[0055] (II) Preparation method of waterproof coating repair agent

[0056] Weigh 650g of the first acrylic emulsion and add it to the liquid material mixing tank, turn on the disperser, and keep the speed at 600r / min-750r / min; then in the first step, add 200g of water and 80g of amino silicone oil emulsion to the emulsion system respectively, and stir for 5min; in the second step, weigh 150g of the second acrylic emulsion, and then slowly drop it into the above system and stir for 10min; in the third step, slowly drop 5g of polyether defoamer and 0.5g of citric acid into the above system and stir for 5min. Finally, stir the whole for 5min to obtain the repair agent.

[0057] (III) Waterproof coating

[0058] The waterproof coating consists of three layers: the bottom layer is a polymer waterproof coating layer formed by an acrylic waterproof coating film, the middle layer is a repair agent layer formed by a repair agent film of this embodiment, and the upper layer is a polymer waterproof coating layer formed by an acrylic waterproof coating film. The bottom layer has a thickness of 0.8 mm (dry film thickness), the middle layer has a thickness of 0.1 mm (dry film thickness), the upper layer has a thickness of 0.7 mm (dry film thickness), and the total thickness of the waterproof coating is 1.6 mm.

[0059] (IV) Performance test: The waterproof coating was prepared in accordance with the requirements of standard GB / T 23445-2009 “Polymer cement waterproof coating”, and relevant tests were conducted on its impermeability, mechanical properties and adhesion properties; in addition, in order to verify the mutual adhesion between the coatings, the water penetration of the waterproof coating was verified, see Table 1 for details.

[0060] Example 3

[0061] (1) Waterproof coating repair agent

[0062] The invention comprises: 650g of a first acrylic emulsion, 200g of a second acrylic emulsion, 50g of an amino silicone oil emulsion, 0.5g of citric acid, and 5g of a polyether defoamer. The first acrylic emulsion has a viscosity of 0MPa·s to 500MPa·s at 25°C, and the second acrylic emulsion has a viscosity of 1000MPa·s to 3000MPa·s at 25°C.

[0063] (II) Preparation method of waterproof coating repair agent

[0064] Weigh 650g of the first acrylic emulsion and add it to the liquid material mixing tank, turn on the disperser, and keep the speed at 600r / min-750r / min; then in the first step, add 200g of water and 50g of amino silicone oil emulsion to the emulsion system respectively, and stir for 5min; in the second step, weigh 200g of the second acrylic emulsion, and then slowly drop it into the above system, and stir for 10min; in the third step, slowly drop 5g of polyether defoamer and 0.5g of citric acid into the above system, and stir for 5min. Finally, stir the whole for 5min to obtain the repair agent.

[0065] (III) Waterproof coating

[0066] The waterproof coating consists of three layers: the bottom layer is a polymer waterproof coating layer formed by an acrylic waterproof coating film, the middle layer is a repair agent layer formed by a repair agent film of this embodiment, and the upper layer is a polymer waterproof coating layer formed by an acrylic waterproof coating film. The bottom layer has a thickness of 0.8 mm (dry film thickness), the middle layer has a thickness of 0.1 mm (dry film thickness), the upper layer has a thickness of 0.7 mm (dry film thickness), and the total thickness of the waterproof coating is 1.6 mm.

[0067] (IV) Performance test: The waterproof coating was prepared in accordance with the requirements of standard GB / T 23445-2009 “Polymer cement waterproof coating”, and relevant tests were conducted on its impermeability, mechanical properties and adhesion properties; in addition, in order to verify the mutual adhesion between the coatings, the water penetration of the waterproof coating was verified, see Table 1 for details.

[0068] Comparative Example 1

[0069] The difference from Example 1 is that the waterproof coating of Comparative Example 1 does not include a repair agent layer. The waterproof coating of Comparative Example 1 is a polymer waterproof coating layer formed by an acrylic waterproof coating film, and the dry film thickness is 1.6 mm.

[0070] The performance test of the waterproof coating of comparative example 1 is shown in Table 1. The waterproof coating of comparative example 1 is tested for water penetration as follows: Figure 2 shown.

[0071] Comparative Example 2

[0072] The difference from Example 1 is that the amount of the second acrylic emulsion added is changed to 0 g, and the amount of the amino silicone oil emulsion added is changed to 0 g.

[0073] Comparative Example 3

[0074] The difference from Example 1 is that the added amount of the second acrylic emulsion is 50 g.

[0075] Comparative Example 4

[0076] The difference from Example 1 is that the added amount of the second acrylic emulsion is 250 g.

[0077] Comparative Example 5

[0078] The difference from Example 1 is that the added amount of amino silicone oil emulsion is 0 g.

[0079] Comparative Example 6

[0080] The difference from Example 1 is that the added amount of amino silicone oil emulsion is 150 g.

[0081] Table 1 Performance test results of embodiments and comparative examples

[0082]

[0083] Results and Discussion

[0084] Water penetration is a method for evaluating the long-term performance of a coating. In this application, the waterproof coatings of Examples 1-3 and Comparative Examples 1-6 are applied to a concrete base that has been soaked in rainwater for a long time, and the presence of bulging and cracks on the coating surface is observed to judge whether there is separation between the coatings. The water penetration results are shown in Table 1. Among them, the conditions of Example 1 and Comparative Example 1 after the water penetration simulation test are as follows Figure 1 and Figure 2 As shown, it can be seen that the repair agent significantly improves the water penetration performance of the coating, and the bulges on the coating surface are significantly reduced or even disappear. This shows that the use of the repair agent makes the interaction between the coatings stronger and the probability of water entering the coating is significantly reduced.

[0085] As can be seen from Table 1, compared with the pure paint coating (Comparative Example 1), the waterproof coating of Examples 1-3 significantly improves the various properties of the coating. In terms of flexibility, the tensile strength is reduced, but it is still much greater than the 1.8Mpa tensile strength requirement specified in the GB / T 23445-2009 standard, and the elongation at break is significantly improved, which greatly improves the film-forming property, crack resistance and water-proof performance of the coating, making it more adaptable to the base layer, and effectively preventing the cracking problem. In terms of the combination with the base layer, it can be seen that the coating has significantly improved bonding strength due to the penetration and adhesion of the acrylic emulsion and amino silicone oil emulsion in the pores and defects. The waterproof test further confirms the repair effect of the repair agent on the defects and pores of the coating. Even under a water pressure of 0.3MPa, it can still keep the coating from being penetrated by water within 30min. From Comparative Examples 1-3 and Comparative Examples 2-6, it is found that the use of the second acrylic emulsion and amino silicone oil emulsion can significantly improve the adhesion of the coating, but the trend slows down after reaching a certain amount. This shows that under a certain amount, the two materials have limited interaction sites with the coating, and they can no longer act on the coating better when the amount exceeds the limit.

[0086] It can be seen from Comparative Example 2 that when the second acrylic emulsion and the amino silicone oil emulsion are not added to the repair agent, the coating bulges after the water penetration test and fails the water-tightness test.

[0087] It can be seen from Comparative Example 3 that when the content of the second acrylic emulsion in the repair agent is too low, the water penetration test is flat and the impermeability test is qualified. Compared with Comparative Example 1, the performance of the coating is significantly improved, but compared with Examples 1-3, the bonding strength is reduced and the elongation at break is significantly reduced.

[0088] It can be seen from Comparative Example 4 that when the content of the second acrylic emulsion in the repair agent is too high, the water penetration test is smooth and the water impermeability test is qualified. Compared with Comparative Example 1 and Examples 1-3, the tensile strength is significantly reduced.

[0089] It can be seen from Comparative Example 5 that when amino silicone oil emulsion is not added to the repair agent, the water penetration test is flat and the impermeability test is qualified. Compared with Comparative Example 1, the performance of the coating is significantly improved, but compared with Examples 1-3, the bonding strength is reduced and the elongation at break is significantly reduced.

[0090] It can be seen from Comparative Example 6 that when the content of amino silicone oil emulsion in the repair agent is too high, the coating bulges after the water penetration test and fails the water-tightness test.

[0091] In summary, the waterproof coatings of Examples 1-3 of the present application have better comprehensive performance than the waterproof coatings of Comparative Examples 1-6.

[0092] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed. The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application. The above are only preferred implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A waterproof coating repair agent, characterized in that: According to the mass parts include: 65-85 parts of acrylic emulsion, 5-10 parts of amino silicone oil emulsion, 0.02-0.1 parts of organic weak acid, 0.5-2 parts of defoaming agent; The acrylic emulsion comprises: a first acrylic emulsion with a viscosity of 0 MPa·s to 500 MPa·s at 25°C and a second acrylic emulsion with a viscosity of 1000 MPa·s to 3000 MPa·s at 25°C.

2. The waterproof coating repair agent according to claim 1, characterized in that: In the waterproof coating repair agent, the first acrylic emulsion accounts for 55 to 65 parts by mass, and the second acrylic emulsion accounts for 10 to 20 parts by mass.

3. The waterproof coating repair agent according to claim 1 or 2, characterized in that: The particle size of the first acrylic emulsion is no greater than 0.4 μm, and the particle size of the second acrylic emulsion is no greater than 0.4 μm.

4. The waterproof coating repair agent according to claim 3, characterized in that: The mass content of silicone in the amino silicone oil emulsion is 30% to 40%; The organic weak acid is citric acid; The defoamer is a polyether defoamer.

5. A method for preparing a waterproof coating repair agent, characterized in that: include: According to the mass fraction of the waterproof coating repair agent according to any one of claims 1 to 4, the amino silicone oil emulsion is added to the first acrylic emulsion and stirred, and then the second acrylic emulsion is slowly added dropwise and continued to be stirred, and finally the defoaming agent and the organic weak acid are added and stirred again.

6. A waterproof coating, characterized in that: include: At least two polymer waterproof coating layers, and a repair agent layer disposed between the polymer waterproof coating layers; Wherein, the repair agent layer is obtained by using the waterproof coating repair agent coating according to any one of claims 1 to 4.

7. The waterproof coating according to claim 6, characterized in that: The polymer waterproof coating layer is selected from at least one of an ethylene-vinyl acetate waterproof coating layer, an acrylic waterproof coating layer, an acrylic ester waterproof coating layer, an acrylic polymer cement waterproof coating layer and an acrylic ester polymer cement waterproof coating layer.

8. The waterproof coating according to claim 7, characterized in that: The dry film thickness of the polymer waterproof coating layer is 0.5 mm to 1 mm, and the dry film thickness of the repair agent layer is 0.05 mm to 0.15 mm.

9. The waterproof coating according to claim 8, characterized in that: The waterproof coating consists of a first polymer waterproof coating layer as a bottom layer, a repair agent layer in the middle, and a second polymer waterproof coating layer as an upper layer; wherein the dry film thickness of the first polymer waterproof coating layer is 0.7mm to 0.9mm, the dry film thickness of the repair agent layer is 0.08mm to 0.12mm, and the dry film thickness of the second polymer waterproof coating layer is 0.6mm to 0.8mm.

10. The waterproof coating according to claim 9, characterized in that: The repair agent layer can improve the compatibility between the first polymer waterproof coating layer and the second polymer waterproof coating layer, so that the bonding strength of the waterproof coating is greater than 1.30MPa, the tensile strength is greater than 2.0MPa, the elongation at break is greater than 60%, and it remains waterproof for 30 minutes under a water pressure of 0.3MPa and passes the water penetration test.

Images