Waterproof coating for building and method for manufacturing the same

Abstract

The application relates to the technical field of paint, and discloses a waterproof coating for buildings and a manufacturing method thereof. The waterproof coating is formed by mixing epoxy resin as a film-forming material and palygorskite modified material as an auxiliary material. The palygorskite modified material is prepared by grafting a polymer macromolecule with an ether bond on the surface of palygorskite and the polymer macromolecule has a long fatty chain-benzene fluoride alternating structure. The benzene ring structure in the polymer macromolecule structure can form a pi-pi conjugation effect with the benzene ring in the epoxy resin structure, so that the interface effect between the palygorskite and the epoxy resin can be improved, the palygorskite can efficiently play its own effect, the strength of the coating can be enhanced, the existence of the molecular chain of the polymer macromolecule structure can endow the coating with a super-hydrophobic effect similar to that of a lotus leaf, and thus the permeation of water can be effectively prevented and the waterproof performance of the coating can be improved.

Description

Technical Field

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

[0002] Waterproof coatings for construction are an important component of the field of building materials. They play a vital role in protecting building structures from moisture erosion, extending the service life of buildings, and improving the overall performance of buildings. Existing waterproof coatings mainly include inorganic waterproof coatings and organic waterproof coatings. Among them, inorganic waterproof coatings are generally based on cement coatings. Although this type of coating has strong weather resistance, it is easy to crack and it is difficult to form long-term waterproof protection. Organic waterproof coatings mainly include asphalt waterproof coatings and polymer waterproof coatings. Although asphalt waterproof coatings have good adhesion, they have poor weather resistance. In the natural environment, they are easily affected by natural factors such as ultraviolet rays, rain, and weathering, which causes the coating to age and crack, thereby losing its waterproof function. Among polymer waterproof coatings, epoxy resin coatings have excellent physical and mechanical properties, aging resistance, freeze-thaw resistance, corrosion resistance and other characteristics, so they have great advantages in the field of building coatings.

[0003] However, epoxy resin is relatively brittle after curing, has poor impact toughness, and is prone to impact cracking. In addition, its own bonding and waterproof properties need to be improved. Therefore, the present invention provides an epoxy resin coating that can be directly used for building waterproofing to solve the above problems. Summary of the Invention

[0004] In order to solve the problems mentioned in the background technology, the purpose of the present invention is to provide a waterproof coating for construction and a method for manufacturing the same.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for producing a waterproof coating for construction, the waterproof coating comprising the following raw materials measured in parts by weight:

[0007]

[0008] The preparation method of the waterproof coating comprises the following steps:

[0009] The first step is to mix the epoxy resin and the diluent, stir at a stirring rate of 300-500 r / min for 10-20 minutes, stop stirring, add the modified palygorskite material and heavy calcium carbonate, grind with three rollers 1-2 times, and then add cellulose acetate, stir and disperse for 10-30 minutes to form a precursor;

[0010] The second step is to add defoamer, leveling agent, antioxidant and anti-ultraviolet agent to the precursor, control the stirring rate to 100-300r / min, stir for 5-15min, and grind again with three rollers for 1-2 times to form a mixture;

[0011] The third step is to add the curing agent to the mixture, stir and mix evenly, discharge and package the mixture, and store it at room temperature to obtain the waterproof coating.

[0012] As a further embodiment of the present invention, the epoxy resin is at least one of E44 epoxy resin and E51 epoxy resin.

[0013] As a further embodiment of the present invention, the specific preparation method of the modified palygorskite material comprises the following steps:

[0014] Step 1: Using toluene as a medium, dispersing palygorskite in the medium, then adding anhydride monomer, raising the temperature to 90-100° C., stirring at this temperature for 4-6 hours, then adding p-toluenesulfonic acid and diol monomer, continuing stirring and reacting for 8-12 hours, cooling and discharging, separating the solid material, and obtaining functionalized palygorskite;

[0015] Step 2: Add the functionalized palygorskite to N,N-dimethylformamide, ultrasonically disperse for 20-40 minutes, add a 10-15% mass fraction of sodium hydroxide solution to the formed dispersion, and raise the temperature to 50-60°C. After continuous stirring for 1-2 hours, continue to add the bridge and diol monomers, stir and react for 12-18 hours, stop heating, discharge, collect the solid material, wash, and vacuum dry to obtain the palygorskite modified material.

[0016] As a further embodiment of the present invention, in step 1, the anhydride monomer is any one of maleic anhydride, succinic anhydride or glutaric anhydride.

[0017] As a further embodiment of the present invention, the diol monomer is any one of 1,8-octanediol, 1,10-decanediol or 1,12-dodecanediol.

[0018] In the above technical solution, palygorskite is first modified with anhydride monomers to obtain a palygorskite intermediate with active carboxyl substituents on the surface. Then, under the catalytic action of p-toluenesulfonic acid, the diol monomer is modified on the palygorskite surface by utilizing the principle that the active hydroxyl groups in the diol monomer structure can condense with the carboxyl groups to obtain functionalized palygorskite.

[0019] Then, with the hydroxyl groups on the surface of functionalized palygorskite as active sites, under the action of sodium hydroxide, the bridging body and the diol monomer can undergo continuous substitution reactions on the surface of the palygorskite, thereby grafting polymer macromolecules with long fatty chain-benzene-fluorine alternating structures connected by ether bonds on the surface of the palygorskite, namely, palygorskite modified materials.

[0020] As a further solution of the present invention, in step 2, the specific preparation method of the bridge is as follows:

[0021] Add bis(2-chloroethyl)amine, 3-(trifluoromethyl)phenyl isocyanate and 1,4-dioxane to the reactor, stir and mix evenly after the addition is completed, then add the catalyst to the reactor under nitrogen protection, turn on the heating, when the temperature reaches 70-80°C, keep stirring at this temperature for 3-6 hours, evaporate to remove the solvent, cool and discharge, and purify to obtain the bridged body.

[0022] As a further embodiment of the present invention, the molar ratio of bis(2-chloroethyl)amine to 3-(trifluoromethyl)phenyl isocyanate is 1:1.

[0023] As a further embodiment of the present invention, the catalyst is any one of dibutyltin dilaurate, dibutyltin bisacetylacetonate or dibutyltin diacetate.

[0024] In the above technical solution, a metal catalyst is used to catalyze the reaction of the secondary amine group in the bis(2-chloroethyl)amine structure with the isocyanate group in the 3-(trifluoromethyl)phenylisocyanate structure to obtain a phenylfluorine derivative having an oil-equivalent halogen substituent in the structure, i.e., a bridged body.

[0025] As a further embodiment of the present invention, the diluent is ethylene glycol ethyl ether acetate or propylene glycol methyl ether acetate; the antioxidant is antioxidant 1010 or antioxidant 1076; the anti-ultraviolet agent is ultraviolet absorber UV-327 or ultraviolet absorber UV-120; and the curing agent is an amine curing agent.

[0026] A waterproof coating for construction is prepared by adopting the above-mentioned manufacturing method.

[0027] Beneficial effects of the present invention:

[0028] The present invention obtains a palygorskite modified material by grafting polymer macromolecules having a long fatty chain-benzene-fluorine alternating structure connected by ether bonds on the surface of the palygorskite, and using the polymer macromolecules as an additive to mix with an epoxy resin. Since the polymer macromolecule structure contains a benzene ring structure and can form a π-π conjugation effect with the benzene ring in the epoxy resin structure, the polymer macromolecule chain can form a mutually entangled and interwoven network structure with the epoxy resin molecular chain, thereby greatly improving the interfacial effect between the palygorskite and the epoxy resin, enabling the palygorskite to exist in the form of cross-linking points. When a coating formed by the cured coating is subjected to an external force impact, the palygorskite can achieve stress load transfer and dispersion, thereby effectively improving the mechanical strength of the coating.

[0029] The presence of long fatty chains and alternating benzene-fluorine structures within the polymer macromolecules enables them to exhibit extremely strong hydrophobic properties. These molecular chains significantly enhance the coating's hydrophobicity, imparting a super-hydrophobic effect similar to that of a lotus leaf, making it difficult for water to adhere to the coating surface and effectively preventing water penetration. Furthermore, the ether bonds within the polymer macromolecules can form hydrogen bonds with the adhered object, further enhancing the coating's adhesion. Furthermore, palygorskite itself has a layered chain structure that, when evenly spread, forms a barrier layer, further enhancing the coating's water-repellent properties.

[0030] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is the FT-IR graph of the bridged body. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] Example 1, a waterproof coating for construction, comprising the following raw materials measured in parts by weight:

[0035]

[0036] The preparation method of the waterproof coating comprises the following steps:

[0037] The first step is to mix epoxy resin and ethylene glycol ethyl ether acetate, stir at a stirring rate of 300 r / min for 20 minutes, stop stirring, add palygorskite modified material and heavy calcium carbonate, grind twice with three rollers, and then continue to add cellulose acetate. Stir and disperse for 10 minutes to form a precursor;

[0038] In the second step, defoamer, leveling agent, antioxidant 1010 and ultraviolet absorber UV-327 were added to the precursor, the stirring rate was controlled at 100 r / min, and after stirring for 15 minutes, the mixture was ground by three rollers twice to form a mixture;

[0039] The third step is to add the curing agent to the mixture, stir and mix evenly, discharge and package the mixture, and store it at room temperature to obtain the waterproof coating.

[0040] The epoxy resin used is E51 epoxy resin; the defoaming agent used is BYK-085; the leveling agent used is BYK-310; the following are the same.

[0041] Example 2, a waterproof coating for construction, comprising the following raw materials measured in parts by weight:

[0042]

[0043]

[0044] The preparation method of the waterproof coating comprises the following steps:

[0045] The first step is to mix epoxy resin and propylene glycol methyl ether acetate, stir at a stirring rate of 400 r / min for 15 minutes, stop stirring, add palygorskite modified material and heavy calcium carbonate, grind twice with three rollers, and then continue to add cellulose acetate. Stir and disperse for 20 minutes to form a precursor;

[0046] In the second step, defoamer, leveling agent, antioxidant 1076 and UV absorber UV-120 were added to the precursor, the stirring rate was controlled at 200 r / min, and after stirring for 10 minutes, the mixture was ground by three rollers twice to form a mixture;

[0047] The third step is to add the curing agent to the mixture, stir and mix evenly, discharge and package the mixture, and store it at room temperature to obtain the waterproof coating.

[0048] Example 3, a waterproof coating for construction, comprising the following raw materials measured in parts by weight:

[0049]

[0050]

[0051] The preparation method of the waterproof coating comprises the following steps:

[0052] The first step is to mix epoxy resin and propylene glycol methyl ether acetate, stir at a stirring rate of 500 r / min for 10 minutes, stop stirring, add palygorskite modified material and heavy calcium carbonate, grind twice with three rollers, and then continue to add cellulose acetate. Stir and disperse for 30 minutes to form a precursor;

[0053] In the second step, defoamer, leveling agent, antioxidant 1076 and UV absorber UV-120 were added to the precursor, the stirring rate was controlled at 300 r / min, and after stirring for 5 minutes, the mixture was ground by three rollers twice to form a mixture;

[0054] The third step is to add the curing agent to the mixture, stir and mix evenly, discharge and package the mixture, and store it at room temperature to obtain the waterproof coating.

[0055] The modified palygorskite material in the above embodiment is prepared by the following method:

[0056] Step 1: Using toluene as a medium, 2.6 g of palygorskite is dispersed in the medium, and then 2.5 g of succinic anhydride is added. After the addition is completed, the temperature is raised to 95 ° C. and stirred for 6 hours. Then, 0.1 g of p-toluenesulfonic acid and 3.2 g of 1,8-octanediol are added. After continuous stirring for 9 hours, the temperature is lowered and the solid material is separated to obtain functionalized palygorskite;

[0057] Step 2: 1.8 g of functionalized palygorskite was added to N, N-dimethylformamide, and after ultrasonic dispersion for 30 min, 10 mL of 15% sodium hydroxide solution was added to the formed dispersion, and the temperature was raised to 50 ° C. After continuous stirring for 1 h, 1.5 g of the bridged body and 0.6 g of 1,8-octanediol were added. After stirring for 18 h, the heating was stopped, the material was discharged, and the solid material was collected. After washing and vacuum drying, the palygorskite modified material was obtained.

[0058] The preparation method of the bridge body is as follows:

[0059] 0.3 g of bis(2-chloroethyl)amine, 0.4 g of 3-(trifluoromethyl)phenyl isocyanate and 1,4-dioxane were added to the reactor. After the addition was completed, the mixture was stirred and evenly mixed. Then, 0.01 g of dibutyltin dilaurate was added to the reactor under nitrogen protection. After the addition was completed, heating was turned on. When the temperature reached 75°C, stirring was maintained at this temperature for 4 hours, the solvent was evaporated and removed, the temperature was lowered and the material was discharged. After purification, a bridged body was obtained.

[0060] Figure 1 This is the infrared analysis test image of the bridge body, where 3000cm -1 ~3100cm -1 The characteristic absorption peak of the skeleton belonging to the benzene ring appeared at 1676 cm -1 The characteristic absorption peak of amide C=O generated by the reaction of isocyanate and secondary amino group appeared at 1221 cm -1 The characteristic absorption peak attributed to the CF bond appeared at 748 cm -1 A characteristic absorption peak attributed to the C-Cl bond appeared at

[0061] Comparative Example 1, a building coating, comprising the following raw materials measured in parts by weight:

[0062]

[0063] The preparation method of the waterproof coating comprises the following steps:

[0064] The first step is to mix epoxy resin and propylene glycol methyl ether acetate, stir at a stirring rate of 400 r / min for 15 minutes, stop stirring, add palygorskite and heavy calcium carbonate, grind twice with three rollers, and then continue to add cellulose acetate. Stir and disperse for 20 minutes to form a precursor;

[0065] In the second step, defoamer, leveling agent, antioxidant 1076 and UV absorber UV-120 were added to the precursor, the stirring rate was controlled at 200 r / min, and after stirring for 10 minutes, the mixture was ground by three rollers twice to form a mixture;

[0066] The third step is to add the curing agent to the mixture, stir and mix evenly, discharge the material and package it, and store it at room temperature to obtain the coating.

[0067] Comparative Example 2, a building coating, comprising the following raw materials measured in parts by weight:

[0068]

[0069] The preparation method of the waterproof coating comprises the following steps:

[0070] The first step is to mix epoxy resin and propylene glycol methyl ether acetate, stir at a stirring rate of 400 r / min for 15 minutes, stop stirring, add heavy calcium carbonate, grind twice with three rollers, and then continue to add cellulose acetate. Stir and disperse for 20 minutes to form a precursor;

[0071] In the second step, defoamer, leveling agent, antioxidant 1076 and UV absorber UV-120 were added to the precursor, the stirring rate was controlled at 200 r / min, and after stirring for 10 minutes, the mixture was ground by three rollers twice to form a mixture;

[0072] The third step is to add the curing agent to the mixture, stir and mix evenly, discharge the material and package it, and store it at room temperature to obtain the coating.

[0073] Test Example: The waterproof coatings in the examples and comparative examples were made into coatings, and further cut into test samples that met the specifications. Various performance tests were performed, and the results are shown in the following table:

[0074] Table 1 - Test results

[0075] Impact resistance (500g, 500mm) Water seepage Water contact angle / ° Example 1 No obvious cracks No water seepage 152 Example 2 No obvious cracks No water seepage 153 Example 3 No obvious cracks No water seepage 152 Comparative Example 1 Slight cracks Water seepage 124 Comparative Example 2 Severe cracking Water seepage 124

[0076] The impact resistance is tested in accordance with the GB / T 1732-2020 standard;

[0077] The waterproof performance reference standard is GB / T 16777-2008, the test pressure is set to 0.5MPa, and the test time is 2h;

[0078] The water contact angle was measured using a TC-A3 automatic contact angle meter.

[0079] A reasonable analysis based on the test results shows that when unmodified palygorskite is used as a coating additive, on the one hand, there are interface problems, which make it difficult for the palygorskite to be evenly dispersed in the coating, unable to effectively exert its own stress transfer and dispersion effects, and unable to form a continuous barrier layer. Therefore, the effect of improving the impact resistance and waterproof performance of the coating is limited. Moreover, since it does not contain the strong hydrophobic chains brought by polymer macromolecules, it cannot produce a superhydrophobic effect.

[0080] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enable any technician in the field to practice the present invention, including making and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements similar to the literal description of the claims, or if they include equivalent structural elements that are not substantially different from the literal description of the claims, then these other embodiments should also be included in the scope of the claims.

[0081] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those ordinarily skilled in the art should understand: the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced equivalently; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for producing a waterproof coating for construction, characterized in that: The waterproof coating comprises the following raw materials measured in parts by weight: 50-58 parts of epoxy resin; 1.5-3.5 parts of palygorskite modified material; 4-8 parts of cellulose acetate; 3-6 parts of heavy calcium carbonate; 5-10 parts of diluent; 0.5-1 part of defoaming agent; 0.5-1.5 parts of leveling agent; 0.2-0.6 parts of antioxidant; 0.4-0.8 parts of anti-ultraviolet agent; 15-20 parts of curing agent; The preparation method of the waterproof coating comprises the following steps: The first step is to mix the epoxy resin and the diluent, stir at a stirring rate of 300-500 r / min for 10-20 minutes, stop stirring, add the modified palygorskite material and heavy calcium carbonate, grind with three rollers 1-2 times, and then add cellulose acetate, stir and disperse for 10-30 minutes to form a precursor; The second step is to add defoamer, leveling agent, antioxidant and anti-ultraviolet agent to the precursor, control the stirring rate to 100-300r / min, stir for 5-15min, and grind again with three rollers for 1-2 times to form a mixture; The third step is to add the curing agent to the mixture, stir and mix evenly, discharge and package the mixture, and store it at room temperature to obtain a waterproof coating; The specific preparation method of the palygorskite modified material comprises the following steps: Step 1: Using toluene as a medium, dispersing palygorskite in the medium, then adding anhydride monomer, raising the temperature to 90-100°C, stirring at this temperature for 4-6 hours, then adding p-toluenesulfonic acid and diol monomer, continuing stirring and reacting for 8-12 hours, cooling and discharging, separating the solid material, and obtaining functionalized palygorskite; Step 2: adding the functionalized palygorskite to N,N-dimethylformamide, ultrasonically dispersing for 20-40 minutes, adding a 10-15% mass fraction of sodium hydroxide solution to the formed dispersion, and raising the temperature to 50-60°C. After continuous stirring for 1-2 hours, the bridge and diol monomers are added. After stirring for 12-18 hours, the heating is stopped, the material is discharged, and the solid material is collected. After washing and vacuum drying, the palygorskite modified material is obtained; The specific preparation method of the bridge body is as follows: Add bis(2-chloroethyl)amine, 3-(trifluoromethyl)phenyl isocyanate and 1,4-dioxane to the reactor. After the addition is completed, stir and mix evenly. Then, under nitrogen protection, add the catalyst to the reactor. After the addition is completed, turn on the heating. When the temperature reaches 70-80°C, keep stirring at this temperature for 3-6 hours, evaporate to remove the solvent, cool and discharge the material, and purify it to obtain a bridged product.

2. The method for producing a waterproof coating for construction according to claim 1, wherein: The epoxy resin is at least one of E44 epoxy resin and E51 epoxy resin.

3. The method for producing a waterproof coating for construction according to claim 1, wherein: In step 1, the anhydride monomer is any one of maleic anhydride, succinic anhydride or glutaric anhydride.

4. The method for producing a waterproof coating for construction according to claim 1, wherein: The diol monomer is any one of 1,8-octanediol, 1,10-decanediol or 1,12-dodecanediol.

5. The method for producing a waterproof coating for construction according to claim 1, wherein: The molar ratio of the bis(2-chloroethyl)amine to 3-(trifluoromethyl)phenyl isocyanate is 1:

1.

6. The method for producing a waterproof coating for construction according to claim 1, wherein: The catalyst is any one of dibutyltin dilaurate, dibutyltin bisacetylacetonate or dibutyltin diacetate.

7. The method for producing a waterproof coating for construction according to claim 1, characterized in that: The diluent is ethylene glycol ethyl ether acetate or propylene glycol methyl ether acetate; the antioxidant is antioxidant 1010 or antioxidant 1076; the anti-ultraviolet agent is ultraviolet absorber UV-327 or ultraviolet absorber UV-120; and the curing agent is an amine curing agent.

8. A waterproof coating for construction, characterized in that: The method is as described in any one of claims 1 to 7.

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