Spraying quick-setting rubber asphalt waterproof coating and preparation method thereof

Abstract

The present application relates to the technical field of paint, and proposes a kind of spraying quick-setting rubber asphalt waterproof coating and preparation method thereof.A kind of spraying quick-setting rubber asphalt waterproof coating, including component A and component B, component A includes the following weight parts components: base asphalt 40~45 parts, anionic emulsifier 1.5~2 parts, water 20~24 parts, water-based polymer emulsion 30~34 parts, stabilizer 1~1.5 parts, dispersing agent 0.3~0.7 parts, defoaming agent 3~5 parts, nano silicon dioxide 4~8 parts;Component B is the calcium chloride aqueous solution with concentration of 5wt%~10wt%;Water-based polymer emulsion includes water-based carboxyl nitrile latex and water-based hydroxyl acrylic emulsion with mass ratio of 1~3:1.By the above technical scheme, the problem of insufficient tensile property of waterproof membrane formed by the spraying quick-setting rubber asphalt waterproof coating in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a sprayable quick-setting rubber asphalt waterproof coating and its preparation method. Background Technology

[0002] Sprayed quick-setting rubber asphalt waterproof coating, as a high-performance waterproof material, is widely used in various waterproofing projects such as roofs, underground projects, and municipal roads due to its advantages such as high construction efficiency, fast film formation speed, and good adhesion. It has become one of the important materials in the building waterproofing industry.

[0003] However, in practical applications and technological development, existing spray-applied quick-setting rubber asphalt waterproof coatings still have some technical defects, making it difficult to meet the higher performance requirements of current projects for waterproof materials. The waterproof membrane formed by spray-applied quick-setting rubber asphalt waterproof coatings has insufficient tensile strength. The molecular structure characteristics of pure asphalt-based coatings result in high brittleness, easy cracking at low temperatures, and easy softening at high temperatures. When faced with building settlement and base deformation caused by temperature changes, the waterproof membrane is prone to damage and cracking, thus losing its waterproof effect. Summary of the Invention

[0004] This invention proposes a sprayable quick-setting rubber asphalt waterproof coating and its preparation method, which solves the problem of insufficient tensile properties of the waterproof membrane formed by sprayable quick-setting rubber asphalt waterproof coatings in related technologies.

[0005] The technical solution of the present invention is as follows: This invention proposes a sprayable quick-setting rubber asphalt waterproof coating, comprising component A and component B. Component A comprises the following components by weight: 40-45 parts of base asphalt, 1.5-2 parts of anionic emulsifier, 20-24 parts of water, 30-34 parts of water-based polymer emulsion, 1-1.5 parts of stabilizer, 0.3-0.7 parts of dispersant, 3-5 parts of defoamer, and 4-8 parts of nano-silica. Component B is a calcium chloride aqueous solution with a concentration of 5wt%~10wt%; The aqueous polymer emulsion comprises aqueous carboxylated nitrile latex and aqueous hydroxyl acrylic emulsion in a mass ratio of 1 to 3:1.

[0006] As a further technical solution, the aqueous polymer emulsion comprises aqueous carboxylated nitrile latex and aqueous hydroxy acrylic emulsion in a mass ratio of 1~1.5:1.

[0007] As a further technical solution, the nano-silica is cyano-modified nano-silica; the cyano-modified nano-silica is obtained by modifying nano-silica with 2-cyanoethyltriethoxysilane.

[0008] In this invention, the tensile properties of the quick-setting rubber asphalt waterproof membrane are further improved by adding cyano-modified nano-silica. The introduction of cyano polar groups onto the surface not only improves its dispersibility in the rubber asphalt system but also enhances the interfacial bonding between inorganic particles and the polymer emulsion, resulting in a denser coating structure and more uniform stress transmission, thereby further improving the tensile strength of the waterproof membrane.

[0009] As a further technical solution, the method for preparing the cyano-modified nano-silica includes the following steps: Nano-silica was dispersed in a solvent, and 2-cyanoethyltriethoxysilane and a catalyst were added. The mixture was reacted, filtered, washed, and dried to obtain cyano-modified nano-silica.

[0010] As a further technical solution, the mass-to-volume ratio of the nano-silica to 2-cyanoethyltriethoxysilane is 0.5g:1~1.5mL; The volume ratio of the catalyst to 2-cyanoethyltriethoxysilane is 0.05:1~1.5.

[0011] As a further technical solution, the reaction temperature is 60~70℃ and the reaction time is 20~24h.

[0012] As a further technical solution, the catalyst includes dibutyltin dilaurate.

[0013] As a further technical solution, the anionic emulsifier includes one or more of alkylbenzene sulfonates, alkylnaphthalene sulfonates, and petroleum sulfonates.

[0014] As a further technical solution, the stabilizer includes sodium silicate; The dispersant includes polyacrylate; The defoamer includes mineral oil-based defoamers and / or silicone-based defoamers.

[0015] This invention also proposes a method for preparing a spray-applied quick-setting rubber asphalt waterproof coating, comprising the following steps: Anionic emulsifier and stabilizer are dissolved in water to obtain anionic emulsifier solution. The base asphalt is heated to 135~145℃, and anionic emulsifier solution at 60~70℃ is added and ground to obtain anionic emulsified asphalt. The temperature is lowered to 50~70℃ and aqueous polymer emulsion, dispersant, defoamer and nano silica are added and mixed to obtain component A. Calcium chloride is dissolved in water to obtain a calcium chloride aqueous solution with a concentration of 5wt%~10wt%, which is component B.

[0016] The working principle and beneficial effects of this invention are as follows: In this invention, the tensile properties of a quick-setting rubber asphalt waterproof membrane are improved by compounding waterborne carboxylated nitrile butadiene latex and waterborne hydroxyl acrylic emulsion. The carboxylated nitrile butadiene latex has a flexible molecular chain, which imparts excellent flexibility, elongation, and adhesion to the waterproof membrane after film formation, effectively resisting substrate deformation and stress cracking, and compensating for the brittleness and easy breakage defects of pure asphalt coatings. The hydroxyl acrylic emulsion forms a dense film with high cohesive strength, forming a rigid continuous phase in the coating, significantly improving the tensile strength, hardness, and scratch resistance of the waterproof membrane. Simultaneously, its side-chain hydroxyl groups can form hydrogen bonds with polar components in the system, further enhancing interfacial bonding. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] In the following examples and comparative examples, the solid content of the waterborne carboxylated nitrile latex is 45wt%~55wt%, and the viscosity is 30~120mpa·s; the solid content of the waterborne hydroxy acrylic emulsion is 41wt%~45wt%, and the viscosity is 50~200mpa·s; the solid content of the waterborne nitrile latex is 45wt%; the solid content of the waterborne acrylic emulsion is 47wt%~49wt%, and the viscosity is 100~1000mpa·s; and the defoamer is BYK-065.

[0019] Example 1 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of matrix asphalt to 135°C, adding the anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous polymer emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous hydroxyl acrylic emulsion in a mass ratio of 1:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B.

[0020] Example 2 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 2 parts of sodium dodecylbenzenesulfonate and 1.5 parts of sodium silicate in 24 parts of water to obtain an anionic emulsifier solution; heating 45 parts of matrix asphalt to 145°C, adding an anionic emulsifier solution at 70°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 70°C and adding 34 parts of aqueous polymer emulsion, 0.7 parts of sodium polyacrylate, 5 parts of defoamer, and 8 parts of nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous hydroxyl acrylic emulsion in a mass ratio of 3:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 10 wt%, which is component B.

[0021] Example 3 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.8 parts of sodium dodecylbenzenesulfonate and 1.2 parts of sodium silicate in 22 parts of water to obtain an anionic emulsifier solution; heating 42 parts of matrix asphalt to 140°C, adding the anionic emulsifier solution at 65°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 60°C and adding 32 parts of aqueous polymer emulsion, 0.5 parts of sodium polyacrylate, 4 parts of defoamer, and 6 parts of nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous hydroxy acrylic emulsion in a mass ratio of 2:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain an aqueous solution of calcium chloride with a concentration of 8 wt%, which is component B.

[0022] Example 4 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of matrix asphalt to 135°C, adding the anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous polymer emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous hydroxyl acrylic emulsion in a mass ratio of 1.5:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B.

[0023] Example 5 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of matrix asphalt to 135°C, adding the anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous polymer emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous hydroxy acrylic emulsion in a mass ratio of 2:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B.

[0024] Example 6 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of matrix asphalt to 135°C, adding the anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous polymer emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous hydroxyl acrylic emulsion in a mass ratio of 1:2; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B.

[0025] Example 7 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of matrix asphalt to 135°C, adding an anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous polymer emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of cyano-modified nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous hydroxyl acrylic emulsion in a mass ratio of 1.5:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B; The above-mentioned method for preparing cyano-modified nano-silica includes the following steps: Nano-silica was dispersed in a solvent (the mass-to-volume ratio of nano-silica to solvent was 0.5 g: 100 mL), and 2-cyanoethyltriethoxysilane (the mass-to-volume ratio of nano-silica to 2-cyanoethyltriethoxysilane was 0.5 g: 1~1.5 mL) and dibutyltin dilaurate (the volume ratio of dibutyltin dilaurate to 2-cyanoethyltriethoxysilane was 0.05: 1~1.5) were added. The mixture was reacted, filtered, washed, and dried to obtain cyano-modified nano-silica. The solvent consisted of water and anhydrous ethanol in a volume ratio of 1:9.

[0026] Example 8 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of matrix asphalt to 135°C, adding an anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous polymer emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of cyano-modified nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous hydroxyl acrylic emulsion in a mass ratio of 1.5:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B; The above-mentioned method for preparing cyano-modified nano-silica includes the following steps: Nano-silica was dispersed in a solvent (the mass-to-volume ratio of nano-silica to solvent was 0.5 g: 100 mL), and 2-cyanoethyltriethoxysilane (the mass-to-volume ratio of nano-silica to 2-cyanoethyltriethoxysilane was 0.5 g: 1~1.5 mL) and dibutyltin dilaurate (the volume ratio of dibutyltin dilaurate to 2-cyanoethyltriethoxysilane was 0.05: 1~1.5) were added. The mixture was reacted, filtered, washed, and dried to obtain cyano-modified nano-silica. The solvent consisted of water and anhydrous ethanol in a volume ratio of 1:9.

[0027] Comparative Example 1 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of matrix asphalt to 135°C, adding the anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous polymer emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous carboxylated nitrile latex and aqueous acrylic emulsion in a mass ratio of 1:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B.

[0028] Comparative Example 2 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of matrix asphalt to 135°C, adding the anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous polymer emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of nano silica, mixing to obtain component A, wherein the aqueous polymer emulsion includes aqueous nitrile latex and aqueous acrylic emulsion in a mass ratio of 1:1; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B.

[0029] Comparative Example 3 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of base asphalt to 135°C, adding the anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of waterborne carboxylated nitrile latex, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of nano silica, and mixing to obtain component A; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B.

[0030] Comparative Example 4 Sprayed quick-setting rubber asphalt waterproof coating includes component A and component B; The preparation method of component A includes the following steps: dissolving 1.5 parts of sodium dodecylbenzenesulfonate and 1 part of sodium silicate in 20 parts of water to obtain an anionic emulsifier solution; heating 40 parts of base asphalt to 135°C, adding the anionic emulsifier solution at 60°C, and grinding in a colloid mill to obtain anionic emulsified asphalt; cooling to 50°C and adding 30 parts of aqueous hydroxyl acrylic emulsion, 0.3 parts of sodium polyacrylate, 3 parts of defoamer, and 4 parts of nano silica, mixing to obtain component A; The preparation method of component B includes the following steps: dissolving calcium chloride in water to obtain a calcium chloride aqueous solution with a concentration of 5 wt%, which is component B.

[0031] Experimental Example 1 The components A and B obtained in Examples 1-8 and Comparative Examples 1-4 were used to prepare a sprayable quick-setting rubber asphalt waterproof membrane by spraying with a two-component spraying equipment. The mass ratio of component A to component B was 9:1. The tensile properties were tested according to the method specified in JC / T2317-2015 "Sprayed Rubber Asphalt Waterproof Coating". The test results are shown in Table 1. Table 1 Tensile property test results

[0032] By comparing the data of Examples 1-8 and Comparative Examples 1-4, it was found that the tensile strength of the quick-setting rubber asphalt waterproof membrane obtained by using waterborne carboxylated nitrile latex and waterborne hydroxy acrylic emulsion in Examples 1-8 was higher than that in Comparative Examples 1-4. This indicates that the tensile properties of the quick-setting rubber asphalt waterproof membrane were improved by combining waterborne carboxylated nitrile latex and waterborne hydroxy acrylic emulsion. By comparing the data of Examples 1 and Examples 4-6, it was found that the tensile properties of the quick-setting rubber asphalt waterproof membrane in Examples 1 and 4 were further improved by adjusting the mass ratio of waterborne carboxylated nitrile latex and waterborne hydroxy acrylic emulsion to 1-1.5:1.

[0033] By comparing the data of Examples 4 and Examples 7-8, the tensile strength of the quick-setting rubber asphalt waterproof membrane obtained by adding cyano-modified nano silica in Examples 7-8 was higher than that in Example 4. This indicates that the tensile properties of the quick-setting rubber asphalt waterproof membrane can be further improved by adding cyano-modified nano silica.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sprayable, quick-setting rubber asphalt waterproof coating, characterized in that, It includes component A and component B. Component A includes the following components by weight: 40-45 parts of base asphalt, 1.5-2 parts of anionic emulsifier, 20-24 parts of water, 30-34 parts of waterborne polymer emulsion, 1-1.5 parts of stabilizer, 0.3-0.7 parts of dispersant, 3-5 parts of defoamer, and 4-8 parts of nano silica. Component B is a calcium chloride aqueous solution with a concentration of 5wt%~10wt%; The aqueous polymer emulsion comprises aqueous carboxylated nitrile latex and aqueous hydroxyl acrylic emulsion in a mass ratio of 1 to 3:

1.

2. The sprayable quick-setting rubber asphalt waterproof coating according to claim 1, characterized in that, The aqueous polymer emulsion comprises aqueous carboxylated nitrile latex and aqueous hydroxy acrylic emulsion in a mass ratio of 1 to 1.5:

1.

3. The sprayable quick-setting rubber asphalt waterproof coating according to claim 1, characterized in that, The nano-silica is cyano-modified nano-silica; the cyano-modified nano-silica is obtained by modifying nano-silica with 2-cyanoethyltriethoxysilane.

4. The sprayable quick-setting rubber asphalt waterproof coating according to claim 3, characterized in that, The method for preparing the cyano-modified nano-silica includes the following steps: Nano-silica was dispersed in a solvent, and 2-cyanoethyltriethoxysilane and a catalyst were added. The mixture was reacted, filtered, washed, and dried to obtain cyano-modified nano-silica.

5. The sprayable quick-setting rubber asphalt waterproof coating according to claim 4, characterized in that, The mass-to-volume ratio of the nano-silica to 2-cyanoethyltriethoxysilane is 0.5 g: 1~1.5 mL; The volume ratio of the catalyst to 2-cyanoethyltriethoxysilane is 0.05:1~1.

5.

6. The sprayable quick-setting rubber asphalt waterproof coating according to claim 4, characterized in that, The reaction temperature is 60~70℃, and the reaction time is 20~24h.

7. The sprayable quick-setting rubber asphalt waterproof coating according to claim 5, characterized in that, The catalyst includes dibutyltin dilaurate.

8. The sprayable quick-setting rubber asphalt waterproof coating according to claim 1, characterized in that, The anionic emulsifier includes one or more of alkylbenzene sulfonates, alkylnaphthalene sulfonates, and petroleum sulfonates.

9. The sprayable quick-setting rubber asphalt waterproof coating according to claim 1, characterized in that, The stabilizer includes sodium silicate; The dispersant includes polyacrylate; The defoamer includes mineral oil-based defoamers and / or silicone-based defoamers.

10. A method for preparing a sprayable quick-setting rubber asphalt waterproof coating, used to prepare the sprayable quick-setting rubber asphalt waterproof coating according to any one of claims 1 to 9, characterized in that, Includes the following steps: Anionic emulsifier and stabilizer are dissolved in water to obtain anionic emulsifier solution. The base asphalt is heated to 135~145℃, and anionic emulsifier solution at 60~70℃ is added and ground to obtain anionic emulsified asphalt. The temperature is lowered to 50~70℃ and aqueous polymer emulsion, dispersant, defoamer and nano silica are added and mixed to obtain component A. Calcium chloride is dissolved in water to obtain a calcium chloride aqueous solution with a concentration of 5wt%~10wt%, which is component B.

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