Waterproof coating for building and manufacturing method thereof

Abstract

The invention relates to the technical field of coatings, and discloses a waterproof coating for buildings and a manufacturing method thereof.The waterproof coating is formed by mixing epoxy resin serving as a film-forming substance and a palygorskite modified material and the like serving as auxiliary materials, the palygorskite modified material is formed by grafting ether bonds on the surface of palygorskite, and the palygorskite modified material is formed by grafting epoxy resin on the surface of palygorskite. The palygorskite-epoxy resin composite material is prepared from a polymer macromolecule with a long aliphatic chain-phenyl fluorine alternating structure, and a benzene ring structure contained in the polymer macromolecule structure can form a pi-pi conjugation effect with a benzene ring in an epoxy resin structure, so that the interface effect between palygorskite and epoxy resin can be improved, and the palygorskite is promoted to efficiently exert own effects; and due to the existence of a polymer macromolecular structure molecular chain, the coating can be endowed with a lotus leaf-like super-hydrophobic effect, so that the permeation of water can be effectively prevented, and the waterproof performance of the coating is improved.

Description

Technical Field

[0001] The 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 buildings are an important part of the field of building materials. They play a vital role in ensuring that building structures are not eroded by water, 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 and are easily affected by natural factors such as ultraviolet rays, rain, and weathering in the natural environment, causing 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, is prone to impact cracking, and its own bonding and waterproof properties also 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 object 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 300-500r / min for 10-20min, stop stirring, add the modified palygorskite material and heavy calcium carbonate, grind with three rollers for 1-2 times, continue to add cellulose acetate, stir and disperse for 10-30min, and form a precursor;

[0010] Step 2: 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, dispose of the material and package it, 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 solution 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, after the addition, raising the temperature to 90-100° C., stirring for 4-6 hours, then adding p-toluenesulfonic acid and diol monomer, 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, and after ultrasonic dispersion for 20-40 minutes, add a sodium hydroxide solution with a mass fraction of 10-15% to the formed dispersion, and raise the temperature to 50-60°C. After continuous stirring for 1-2 hours, continue to add the bridge body and diol monomer, stir and react for 12-18 hours, stop heating, discharge, collect the solid material, wash and vacuum dry, and 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 scheme, palygorskite is first modified with anhydride monomer to obtain a palygorskite intermediate having active carboxyl substituents on the surface. Then, under the catalytic action of p-toluenesulfonic acid, the active hydroxyl groups in the diol monomer structure can be condensed with the carboxyl groups to modify the diol monomer on the surface of the palygorskite to obtain functionalized palygorskite.

[0019] Next, 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 palygorskite, thereby grafting polymer macromolecules having a long fatty chain-benzene-fluorine alternating structure 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 into a reactor, stir and mix evenly after the addition is completed, then add a catalyst into the reactor under nitrogen protection, turn on the heating after the addition is completed, and when the temperature reaches 70-80°C, keep stirring at this temperature for 3-6 hours, evaporate the solvent, cool and discharge the material, and purify it to obtain a bridged body.

[0022] As a further embodiment of the present invention, the molar ratio of the 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 diacetylacetonate or dibutyltin diacetate.

[0024] In the above technical scheme, 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 solution 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 the above-mentioned preparation method.

[0027] Beneficial effects of the present invention:

[0028] The present invention obtains a palygorskite modified material by grafting a polymer macromolecule having a long fatty chain-benzene-fluorine alternating structure connected by an ether bond on the surface of the palygorskite, and using the polymer macromolecule 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 conjugated effect with the benzene ring in the epoxy resin structure, the polymer macromolecule chain can generate a mutually entangled network structure with the epoxy resin molecular chain, thereby greatly improving the interface effect between the palygorskite and the epoxy resin, enabling the palygorskite to exist in the form of crosslinking points. When a coating formed by curing the coating is impacted by an external force, the palygorskite can achieve the transfer and dispersion of stress loads, thereby effectively improving the mechanical strength of the coating.

[0029] The presence of long fatty chains and alternating benzene-fluorine structures in the polymer macromolecule structure enables it to exhibit extremely strong hydrophobic properties. The presence of these molecular chains can greatly improve the hydrophobic effect of the coating and give the coating a super-hydrophobic effect similar to that of a "lotus leaf", making it difficult for water to adhere to the coating surface, thereby effectively preventing water penetration. In addition, the ether bonds in the polymer macromolecules can also produce hydrogen bonds with the adhered objects, further improving the adhesion of the coating. In addition, palygorskite itself has a layered chain structure, which can form a barrier layer after being evenly spread, further improving the waterproof performance of the coating.

[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 accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

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

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0034] Embodiment 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, continue to add cellulose acetate, stir and disperse for 10 minutes to form a precursor;

[0038] Step 2: Add defoamer, leveling agent, antioxidant 1010 and UV absorber UV-327 to the precursor, control the stirring rate to 100r / min, stir for 15min, and grind again with three rollers twice to form a mixture;

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

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

[0041] Embodiment 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 400r / min for 15min, stop stirring, add palygorskite modified material and heavy calcium carbonate, grind twice with three rollers, continue to add cellulose acetate, stir and disperse for 20min to form a precursor;

[0046] Step 2: Add defoamer, leveling agent, antioxidant 1076 and UV absorber UV-120 to the precursor, control the stirring rate to 200r / min, stir for 10min, and grind twice with three rollers to form a mixture;

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

[0048] Embodiment 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 500r / min for 10min, stop stirring, add palygorskite modified material and heavy calcium carbonate, grind twice with three rollers, continue to add cellulose acetate, stir and disperse for 30min to form a precursor;

[0053] Step 2: Add defoamer, leveling agent, antioxidant 1076 and UV absorber UV-120 to the precursor, control the stirring rate to 300r / min, stir for 5 minutes, and grind twice with three rollers to form a mixture;

[0054] The third step is to add the curing agent to the mixture, stir and mix evenly, dispose of the material and package it, 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, the temperature is raised to 95° C., and the mixture is 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 mixture is cooled and discharged, and the solid material is separated to obtain functionalized palygorskite.

[0057] Step 2: Add 1.8 g of functionalized palygorskite to N,N-dimethylformamide, and after ultrasonic dispersion for 30 minutes, add 10 mL of 15% sodium hydroxide solution to the formed dispersion, and raise the temperature to 50°C. After continuous stirring for 1 hour, continue to add 1.5 g of the bridge body and 0.6 g of 1,8-octanediol. After stirring for 18 hours, stop heating, discharge the material, collect the solid material, wash it, and vacuum dry it to obtain the palygorskite modified material.

[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 are added to the reactor. After the addition is completed, the mixture is stirred and evenly mixed. Then, under the protection of nitrogen, 0.01 g of dibutyltin dilaurate is added to the reactor. After the addition is completed, heating is turned on. When the temperature reaches 75°C, stirring is maintained at this temperature for 4 hours, the solvent is evaporated to remove, the temperature is lowered and the material is discharged. After purification, a bridged body can be 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 1676cm -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, continue to add cellulose acetate, stir and disperse for 20 minutes to form a precursor;

[0065] Step 2: Add defoamer, leveling agent, antioxidant 1076 and UV absorber UV-120 to the precursor, control the stirring rate to 200r / min, stir for 10min, and grind twice with three rollers to form a mixture;

[0066] The third step is to add the curing agent to the mixture, stir and mix evenly, dispose of 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, continue to add cellulose acetate, stir and disperse for 20 minutes to form a precursor;

[0071] Step 2: Add defoamer, leveling agent, antioxidant 1076 and UV absorber UV-120 to the precursor, control the stirring rate to 200r / min, stir for 10min, and grind twice with three rollers to form a mixture;

[0072] The third step is to add the curing agent to the mixture, stir and mix evenly, dispose of 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, and various performance tests were performed. 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 according to the GB / T 1732-2020 standard;

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

[0078] The water contact angle was tested 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 makes it difficult for the palygorskite to be evenly dispersed in the coating, and it cannot effectively exert its own stress transfer and dispersion effects, nor can it 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 the 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 principle of the present invention, the present invention can also be improved and modified, 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 expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in the scope of the claims.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such 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 invention.

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: 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 300-500r / min for 10-20min, stop stirring, add the modified palygorskite material and heavy calcium carbonate, grind with three rollers for 1-2 times, continue to add cellulose acetate, stir and disperse for 10-30min, and form a precursor; Step 2: 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, dispose of the material and package it, and store it at room temperature to obtain the waterproof coating.

2. The method for producing a waterproof coating for construction according to claim 1, characterized in that: 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, characterized in that: 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, after the addition, raising the temperature to 90-100° C., stirring for 4-6 hours, then adding p-toluenesulfonic acid and diol monomer, stirring and reacting for 8-12 hours, cooling and discharging, separating the solid material, and obtaining functionalized palygorskite; Step 2: Add the functionalized palygorskite to N,N-dimethylformamide, and after ultrasonic dispersion for 20-40 minutes, add a sodium hydroxide solution with a mass fraction of 10-15% to the formed dispersion, and raise the temperature to 50-60°C. After continuous stirring for 1-2 hours, continue to add the bridge body and diol monomer, stir and react for 12-18 hours, stop heating, discharge, collect the solid material, wash and vacuum dry, and obtain the palygorskite modified material.

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

5. The method for producing a waterproof coating for construction according to claim 3, characterized in that: The diol monomer is any one of 1,8-octanediol, 1,10-decanediol or 1,12-dodecanediol.

6. The method for manufacturing a waterproof coating for construction according to claim 3, characterized in that: In step 2, the specific preparation method of the bridge is as follows: Add bis(2-chloroethyl)amine, 3-(trifluoromethyl)phenyl isocyanate and 1,4-dioxane into a reactor, stir and mix evenly after the addition is completed, then add a catalyst into the reactor under nitrogen protection, turn on the heating after the addition is completed, and when the temperature reaches 70-80°C, keep stirring at this temperature for 3-6 hours, evaporate the solvent, cool and discharge the material, and purify it to obtain a bridged body.

7. The method for manufacturing a waterproof coating for construction according to claim 6, characterized in that: The molar ratio of the bis(2-chloroethyl)amine to 3-(trifluoromethyl)phenyl isocyanate is 1:

1.

8. The method for manufacturing a waterproof coating for construction according to claim 6, characterized in that: The catalyst is any one of dibutyltin dilaurate, dibutyltin diacetylacetonate or dibutyltin diacetate.

9. 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.

10. A waterproof coating for construction, characterized in that: The method is prepared by the manufacturing method according to any one of claims 1 to 9.

Images