Colored waterproof material and preparation method thereof

Abstract

The present invention relates to a colored waterproof material and a preparation method thereof, wherein the colored waterproof material comprises a liquid component and a powder component; the weight ratio of the liquid component to the powder component is 1:2.5-4; wherein the liquid component comprises a color fixing agent, a butadiene-styrene copolymer emulsion, and an aqueous aliphatic polyurethane hybrid-modified epoxy emulsion; wherein the rheological additive in the powder component is a composition of β-type polymerized 6-deoxy-L-pyranose and calcium carbonate. The colored waterproof material prepared by the present invention can improve the problems of easy efflorescence, poor flexibility, and sometimes weakening of color after construction of the colored waterproof material. The present invention not only has the advantages of good adhesion, flexibility, and good color retention effect, but also has the advantages of being environmentally friendly, excellent performance, and not prone to "efflorescence, whitening, and fading" after construction.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and in particular to a colored waterproof material and a preparation method thereof. Background Art

[0002] In recent years, the domestic building materials industry has continued to grow and develop, and the industry's classification of waterproofing has become increasingly detailed. For example, the polymer cement-based waterproofing field can be further subdivided into JS waterproof coatings, waterproof slurries, and mortars. As consumers' understanding of waterproofing materials increases, their requirements for products are also becoming increasingly higher. However, many technical difficulties still exist in the field of waterproof slurries. If they are not promptly and effectively addressed, it will be difficult to meet consumer needs. For example, the problem of alkali efflorescence after construction will cause the colorful appearance to appear "flowery", reducing the color rendering effect of the waterproof material. If the waterproof product lacks flexibility, it will not be able to adapt to slight vibrations and certain degrees of displacement of the building structure. Moreover, for uneven walls, holes, or fine cracks, waterproof materials with high flexibility can better cover them.

[0003] Efflorescence is mainly generated by the hydroxide and metal ions such as Ca generated during the hydration of silicate cement in cement-based waterproof materials. 2+ Mg 2+ etc., combined to form alkali salts such as Ca(OH)2 and Mg(OH)2. Since the waterproof coating film is not dense enough and has some pores, water migrates through the pores and brings alkali salts such as Ca(OH)2 and Mg(OH)2 to the surface of the waterproof coating. They react with carbon dioxide in the air to form crystals, which then accumulate on the surface of the coating, causing a "whitening" phenomenon, which is the "alkaline efflorescence" phenomenon that often occurs after the construction of colored waterproof materials. As a result, when the waterproof material is actually dry, the construction workers find that the color rendering of the waterproof layer has deteriorated through visual inspection.

[0004] CN111117314A discloses a cement waterproof coating, its preparation method, and its application. By adding a film-forming aid, the latex particles' glass transition temperature is lowered, making them more easily deformable at low temperatures. This facilitates the diffusion, entanglement, and fusion of the latex molecular chains into a continuous film. A water-reducing agent releases moisture between the cement particles, reducing pores left by evaporation, improving the coating's density, and reducing Ca(OH)2 precipitation. An accelerator accelerates cement hydration and shortens the Ca(OH)2 precipitation time. While the addition of an accelerator accelerates cement hydration in CN111117314A, this also shortens the usable life of the waterproof coating.

[0005] CN109942258A discloses an alkali-resistant polymer cement waterproof coating and its preparation method. Ammonium oxalate is added to the powder, which reacts with Ca(OH)2 to form calcium oxalate precipitate, achieving alkali inhibition by solidifying Ca and Mg ions. CN11084597A, on the other hand, involves adding ammonium oxalate to react with calcium hydroxide, generating ammonia water. This volatile ammonia water has a pungent odor and is not environmentally friendly. Summary of the Invention

[0006] The technical problem to be solved by this invention is to provide a colored waterproof material and its preparation method, which can improve the problems of alkali efflorescence, poor flexibility, and occasional color fade after application of colored waterproof materials. This material not only has the advantages of good adhesion, flexibility, and excellent color retention, but also is environmentally friendly, has excellent performance, and is less likely to cause efflorescence or whitening after application.

[0007] To solve the above problems, the present invention is implemented through the following technical solutions:

[0008] The first object of the present invention is:

[0009] Provided is a colored waterproof material, comprising: a liquid component and a powder component;

[0010] The weight ratio of the liquid component to the powder component is 1:2.5-4;

[0011] The liquid component includes the following components in parts by weight:

[0012] 20-70 parts of pure water, 0.15-0.25 parts of preservative, 0.5-1.5 parts of water-based pigment, 0.15-0.25 parts of defoaming agent, 2-10 parts of color fixing agent, 25-45 parts of butadiene-styrene copolymer emulsion, 5-20 parts of water-based aliphatic polyurethane hybrid modified epoxy emulsion;

[0013] The water-based aliphatic polyurethane hybrid-modified epoxy emulsion is one or a combination of water-based acrylic hybrid-modified epoxy emulsion, water-based polyurethane-polyacrylate hybrid-modified epoxy emulsion, and water-based aliphatic polyurethane hybrid-modified epoxy emulsion. In the water-based aliphatic polyurethane hybrid-modified epoxy emulsion, there are urethane bonds in the polyurethane molecules, which can form multiple hydrogen bonds between polymer chains, so that the cured film has the advantages of excellent high flexibility and peel strength.

[0014] The color fixative is a silane coupling agent-modified nano-silica color fixative, a glycidyl acrylate-modified nano-silica color fixative, or a combination thereof. The epoxy groups in the glycidyl acrylate-modified nano-silica color fixative are highly reactive with hydroxyl groups under alkaline conditions. They react with hydroxyl groups in pigments, cement, and ordinary white sand to form covalent bonds, thus binding the pigments and powders that would otherwise not react together. This covalent bond maintains the long-term color stability of the coating. The organic groups in the silane coupling agent's molecular chain can chemically react or form hydrogen bonds with macromolecules in organic matter, forming a strong bond with the organic matter. The hydrolyzable groups can react with inorganic substances. Therefore, when the silane coupling agent is positioned between the organic and inorganic matrices, it can effectively bind these two distinct materials, thereby improving the adhesion of the color and enhancing the color rendering properties of the waterproofing material.

[0015] The powder components include the following components in parts by weight:

[0016] 45-65 parts of Portland cement, 35-55 parts of ordinary white sand, 0.5-1.5 parts of rheological additive, 0.1-0.2 parts of water reducer, 0.1-0.2 parts of water repellent;

[0017] The rheological additives include pyranose and calcium carbonate;

[0018] The pyranose mannoside is a β-type polymerized 6-deoxy-L-pyranose mannoside.

[0019] The colored waterproof material of the present invention is further optimized as follows:

[0020] The butadiene-styrene copolymer emulsion has a butadiene content of 30% to 50% by mass and a styrene content of 60% to 80% by mass; the butadiene-styrene copolymer emulsion has a particle size range of 100 to 150 nm and a glass transition temperature range of 5 to 20° C.

[0021] Butadiene-styrene copolymer emulsion has excellent hydrophilicity and good workability with cement. It has good leveling properties during construction and can provide excellent anti-permeability.

[0022] The colored waterproof material of the present invention is further optimized as follows:

[0023] The weight percentage composition of the β-type polymerized 6-deoxy-L-mannopyranose and calcium carbonate is:

[0024] β-type polymerized 6-deoxy-L-mannopyranose 20% to 40%, calcium carbonate 60% to 80%, and the sum of all components is 100%.

[0025] The β-type crystals in 6-deoxy-L-pyranose in the rheological additive can effectively absorb some water molecules and have good compatibility and affinity with cement. In addition, the calcium carbonate contained in the rheological additive can fill the pores in the coating, cutting off the pore channels for water molecules to migrate from the inside of the coating to the surface, making it difficult for water molecules to bring alkaline substances after cement hydration to the coating surface through the pores, effectively improving the alkali-eluting phenomenon that is prone to occur after construction in existing waterproof materials.

[0026] The second object of the present invention is:

[0027] A method for preparing the aforementioned colored waterproof material is provided, which comprises the following preparation steps:

[0028] A. Preparation of liquid material:

[0029] a1. Add pure water into the mixing tank in proportion, turn on the disperser, and stir at a speed of 800-1000 r / min;

[0030] a2. Preservatives, water-based pigments, defoamers, color fixatives, butadiene-styrene copolymer emulsions, and water-based aliphatic polyurethane hybrid modified epoxy emulsions were added to a stirring tank in order. Stir for 5 minutes after each raw material was added, and then the next raw material was added in turn. After the addition was complete, stirring was carried out at 800 to 1000 r / min for 10 minutes. After stirring was complete, the mixture was packaged and set aside.

[0031] B. Preparation of powder:

[0032] Put Portland cement, ordinary white sand, rheological additive, water reducer and water repellent into a stirring kettle in proportion, stir at a speed of 400-500 r / min for 10 minutes; after stirring, pack and set aside;

[0033] C. Preparation of colored waterproof materials:

[0034] The colored waterproof material and preparation method thereof of the present invention have the following technical features:

[0035] (1) Adding rheological additives to the powder component of the colored waterproof material formula inhibits the freeing of strong calcium oxide to the coating surface (water brings alkaline salts such as Ca(OH)2 and Mg(OH)2 to the surface of the waterproof coating through the pore channels of the coating), thereby inhibiting the efflorescence phenomenon;

[0036] (2) By using butadiene-styrene copolymer emulsion in the liquid component, the leveling and impermeability of the product are improved; the flexibility of the product is improved by using water-based aliphatic polyurethane hybrid modified epoxy emulsion; the color fixing agent maintains the color of the colored waterproof. DETAILED DESCRIPTION

[0037] In order to make the application, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail with reference to specific embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. Any simple improvements to the preparation method of the present invention based on the concept of the present invention fall within the scope of protection of the present invention.

[0038] Example 1: A method for preparing a colored waterproof material

[0039] A method for preparing a colored waterproof material, the colored waterproof material comprising: a liquid component and a powder component;

[0040] The weight ratio of the liquid component to the powder component is 1:2.5-4;

[0041] The liquid component includes the following components in parts by weight:

[0042] 20-70 parts of pure water, 0.15-0.25 parts of preservative, 0.5-1.5 parts of water-based pigment, 0.15-0.25 parts of defoaming agent, 2-10 parts of color fixing agent, 25-45 parts of butadiene-styrene copolymer emulsion, 5-20 parts of water-based aliphatic polyurethane hybrid modified epoxy emulsion;

[0043] The water-based aliphatic polyurethane hybrid modified epoxy emulsion is one or a combination of water-based acrylic hybrid modified epoxy emulsion, water-based polyurethane-polyacrylate hybrid modified epoxy emulsion, and water-based aliphatic polyurethane hybrid modified epoxy emulsion;

[0044] The color fixing agent is one or a combination of silane coupling agent modified nano-silica color fixing agent and glycidyl acrylate modified nano-silica color fixing agent;

[0045] The powder components include the following components in parts by weight:

[0046] 45-65 parts of Portland cement, 35-55 parts of ordinary white sand, 0.5-1.5 parts of rheological additive, 0.1-0.2 parts of water reducer, 0.1-0.2 parts of water repellent;

[0047] The rheological additives include pyranose and calcium carbonate;

[0048] The pyranose mannoside is a β-type polymerized 6-deoxy-L-pyranose mannoside.

[0049] The colored waterproof material comprises the following preparation steps:

[0050] A. Preparation of liquid material:

[0051] a1. Add pure water into the mixing tank according to the proportion, turn on the disperser, and stir at a speed of 800-1000r / min

[0052] a2. Preservatives, water-based pigments, defoamers, color fixatives, butadiene-styrene copolymer emulsions (identified as styrene-butadiene emulsions in Table 1), and water-based aliphatic polyurethane hybrid modified epoxy emulsions were sequentially added to a stirring tank, stirred for 5 minutes after each raw material was added, and then the next raw material was added in sequence. After the addition was complete, stirring was performed at 800 to 1000 r / min for 10 minutes; after stirring was completed, the mixture was packaged for use;

[0053] B. Preparation of powder:

[0054] Put Portland cement, ordinary white sand, rheological additive, water reducer and water repellent into a stirring kettle in proportion, stir at a speed of 400-500 r / min for 10 minutes; after stirring, pack and set aside;

[0055] C. Preparation of colored waterproof materials:

[0056] The prepared liquid component and powder component are poured into the container in sequence according to the proportion, and then immediately stirred evenly with an electric stirrer to obtain a colored waterproof material.

[0057] Table 1 Raw material composition table of embodiment and comparative example (weight parts)

[0058]

[0059] 1. Related performance tests of embodiments and comparative examples:

[0060] Testing method: Refer to JC / T 2090-2011 "Polymer Cement Waterproof Slurry" standard for maintenance and related performance testing;

[0061] The specific results are shown in Table 2:

[0062] Table 2: Relevant performance test results of Examples and Comparative Examples

[0063]

[0064] As can be seen from Table 2, the relevant properties of the embodiments and comparative examples all comply with the JC / T 2090-2011 standard. However, based on the test results of the above performance parameters, Example 1 has the best comprehensive performance, that is, Example 1 is the best in comprehensive performance such as anti-permeability, bonding strength, and flexibility.

[0065] The difference between Comparative Example 2 and Comparative Example 1 is that Comparative Example 1 is a styrene acrylic system and Comparative Example 2 is a styrene butadiene system. As can be seen from Table 2, the use of the styrene butadiene system of Comparative Example 2 has significantly improved impermeability, bonding strength, compressive strength and usable time.

[0066] Comparative Example 3 adds "water-based aliphatic polyurethane hybrid modified epoxy emulsion" to the formula of Comparative Example 2. As can be seen from Table 2, the flexibility of Comparative Example 3 is significantly improved compared with that of Comparative Example 2.

[0067] Comparative Example 4 is a color fixing agent added to the formula of Comparative Example 3, wherein "one or a combination of a silane coupling agent modified nano-silica color fixing agent and a glycidyl acrylate modified nano-silica color fixing agent" is added. As can be seen from Table 3, the efflorescence area of ​​Comparative Example 4 is significantly reduced after the addition of the color fixing agent.

[0068] Comparative Example 5 adds a rheological additive of "β-type polymerized 6-deoxy-L-pyranose and calcium carbonate composition" to the formula of Comparative Example 4. As can be seen from Tables 2 and 3, after adding the rheological additive, the impermeability, bonding strength, and compressive strength are improved, and the anti-efflorescence resistance is also improved to a certain extent.

[0069] Example 1 is based on Comparative Example 5, and the weight ratio of "water-based aliphatic polyurethane hybrid modified epoxy emulsion, fixing agent, and rheological additive" in the formula is optimized. As can be seen from Tables 2 and 3, Example 1 has better comprehensive performance in terms of impermeability, bonding strength, and anti-alkali resistance.

[0070] 2. Anti-efflorescence performance test

[0071] Test method: Refer to the standard JG / T 210-2018 "Primer for Interior and Exterior Walls of Buildings", prepare samples for each sample at the same time and cure for 48 hours, then conduct anti-efflorescence performance test;

[0072] The specific results are shown in Table 3:

[0073] Table 3: Test results of anti-efflorescence performance of Examples and Comparative Examples

[0074] raw material Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Efflorescence area / % 27.6 62 61 61 38.8 28.8

[0075] As can be seen from Table 3, according to the test of JG / T 210-2018 "Primer for Interior and Exterior Walls of Buildings", the efflorescence area of ​​Example 1 is the smallest, so its anti-efflorescence performance is the best.

[0076] In summary, the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the disclosed technical content shall be regarded as equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

[0077] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The experimental methods in the present invention where specific conditions are not specified are generally based on conventional conditions or conditions recommended by the manufacturer.

[0079] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0080] Unless otherwise indicated, percentages and parts are by weight.

[0081] Experimental methods without specific conditions specified in the instructions and examples are generally performed under conventional conditions or conditions recommended by the manufacturer.

[0082] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein can be applied to the methods of the present invention.

Claims

1. A colored waterproof material, characterized by: It includes: liquid component and powder component; The weight ratio of the liquid component to the powder component is 1:2.5-4; The liquid component includes the following components in parts by weight: 20-70 parts of pure water, 0.15-0.25 parts of preservative, 0.5-1.5 parts of water-based pigment, 0.15-0.25 parts of defoaming agent, 2-10 parts of color fixing agent, 25-45 parts of butadiene-styrene copolymer emulsion, 5-20 parts of water-based aliphatic polyurethane hybrid modified epoxy emulsion; The color fixing agent is one or a combination of silane coupling agent modified nano-silica color fixing agent and glycidyl acrylate modified nano-silica color fixing agent; The powder components include the following components in parts by weight: 45-65 parts of Portland cement, 35-55 parts of ordinary white sand, 0.5-1.5 parts of rheological additive, 0.1-0.2 parts of water reducer, 0.1-0.2 parts of water repellent; The rheological additives include pyranose and calcium carbonate; The pyranose mannoside is a β-type polymerized 6-deoxy-L-pyranose mannoside.

2. The colored waterproof material according to claim 1, characterized in that: The butadiene-styrene copolymer emulsion has a butadiene content of 30% to 50% by mass and a styrene content of 60% to 80% by mass; the butadiene-styrene copolymer emulsion has a particle size range of 100 to 150 nm and a glass transition temperature range of 5 to 20° C.

3. The colored waterproof material according to claim 1, characterized in that: The weight percentage composition of the β-type polymerized 6-deoxy-L-mannopyranose and calcium carbonate is: β-type polymerized 6-deoxy-L-pyranose 20% to 40%, calcium carbonate 60% to 80%, and the sum of all components is 100%.

4. A method for preparing the colored waterproof material according to claim 1, characterized in that: It includes the following preparation steps: A. Preparation of liquid material: a1. Add pure water into the mixing tank in proportion, turn on the disperser, and stir at a speed of 800-1000 r / min; a2. Preservatives, water-based pigments, defoamers, color fixatives, butadiene-styrene copolymer emulsions, and water-based aliphatic polyurethane hybrid modified epoxy emulsions were added to a stirring tank in order. Stir for 5 minutes after each raw material was added, and then the next raw material was added in turn. After the addition was complete, stirring was carried out at 800 to 1000 r / min for 10 minutes. After stirring was complete, the mixture was packaged and set aside. B. Preparation of powder: Put Portland cement, ordinary white sand, rheological additive, water reducer and water repellent into a stirring kettle in proportion, stir at a speed of 400-500 r / min for 10 minutes; after stirring, pack and set aside; C. Preparation of colored waterproof materials: The prepared liquid component and powder component are poured into the container in sequence according to the proportion, and then immediately stirred evenly with an electric stirrer to obtain a colored waterproof material.

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