Preparation method of galling waterproof coating based on acrylate polymer
By introducing temperature-sensitive monomers, composite fillers and self-repair microcapsules into acrylate polymer woven waterproof coatings, the problem of degradation of waterproof performance of traditional waterproof materials in complex building structures and long-term water accumulation environments is solved, and efficient waterproofing, heat insulation and self-repairing effects are achieved.
Patent Information
- Application Number
- CN202411977029.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-05-13
AI Technical Summary
Traditional single waterproofing materials are difficult to meet the waterproofing needs of complex building structures and environments. Especially in long-term water accumulation environments, the paint may swell, resulting in a degradation of waterproofing performance.
Using acrylate polymer-based waterproof coating, the polymer with a crosslinking network structure is designed to improve the waterproof, thermal insulation and self-healing properties of the coating by introducing temperature-sensitive monomers into the polymer molecular chain, adding composite fillers and self-healing microcapsules.
It improves the waterproof performance and thermal insulation of the paint, extends the service life, and realizes self-repair when cracks appear on the coating, enhancing the adaptability to different building parts.
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Figure CN119978869A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of waterproof coatings, and in particular to a method for preparing a roughened waterproof coating based on an acrylic ester polymer. Background Art
[0002] With the continuous innovation of modern architectural design, building structures are becoming increasingly complex and diverse, such as high-rise buildings, large commercial complexes, basements, roof gardens, etc. These different types of building parts face various waterproofing problems. For example, the exterior walls of high-rise buildings are exposed to harsh environments such as wind, rain, and ultraviolet rays for a long time, and need to have good waterproof and weather resistance; the basement must withstand the pressure of groundwater to prevent leakage from damaging the building structure and internal facilities. Traditional single waterproof materials are often difficult to meet the requirements of these complex structures and environments. Roughened waterproof coatings came into being. They can not only provide reliable waterproof functions, but also enhance the adhesion with other decorative materials or protective layers through roughening treatment, so as to better adapt to the construction and use requirements of different building parts;
[0003] In some waterproofing projects such as basements or pools with long-term water accumulation, the coating may swell due to long-term contact with water, resulting in a decrease in the waterproof performance of the coating. For this reason, we propose a preparation method for a roughened waterproof coating based on acrylic polymer. Summary of the invention
[0004] The purpose of the present invention is to provide a method for preparing a roughened waterproof coating based on acrylic ester polymer.
[0005] In order to solve the problems raised in the above background technology, the present invention provides the following technical solutions: a method for preparing a roughened waterproof coating based on an acrylic ester polymer, comprising introducing a temperature-sensitive monomer into a molecular chain of a polymer, adding a composite filler and a self-repairing microcapsule, and designing a polymer with a cross-linked network structure. The specific operation steps for preparing the roughened waterproof coating based on an acrylic ester polymer are as follows:
[0006] Step 1: introducing a temperature-sensitive monomer into the molecular chain of the acrylate polymer so that the coating has different physical and chemical properties at different temperatures;
[0007] Step 2: Design a recyclable acrylic polymer, so that the roughened waterproof coating can be decomposed into recyclable monomers under specific conditions after the service life of the roughened waterproof coating ends;
[0008] Step 3: preparing hollow glass microspheres and expanded graphite composite fillers to improve the heat insulation and waterproof properties of the roughened waterproof coating;
[0009] Step 4: Add microcapsules containing active monomers and catalysts to the coating to enable the roughened waterproof coating to self-repair when cracks appear;
[0010] Step 5: Mix the various raw materials obtained with a dispersant, a defoaming agent and a thickener to prepare a roughened waterproof coating, and test the performance of the roughened waterproof coating.
[0011] As a further scheme of the present invention: in the step 1, toluene, methyl acrylate, a temperature-sensitive monomer and dodecanethiol are added to a reactor, N-isopropylacrylamide (NIPAM) is selected as the temperature-sensitive monomer, the amount of methyl acrylate accounts for 60%-90% of the total amount, the amount of NIPAM accounts for 10%-40% of the total amount, the amount of toluene accounts for 1%-5% of the total amount of the polymer, and the amount of dodecanethiol accounts for 0.1%-1% of the total amount of the polymer. The mixture is stirred at a temperature of 20°C-30°C at a rate of 300r / min-500r / min for 20min-30min to form a mixed solution, and then an initiator is added to the reactor, the temperature in the reactor is raised to 60°C-90°C, and the mixture is stirred at a rate of 100r / min-300r / min for 2h-6h under nitrogen protection to form an acrylate polymer containing NIPAM.
[0012] As a further solution of the present invention: in the step 2, an acrylate polymer containing NIPAM, a furfuryl alcohol acrylate diene monomer and an N-phenylmaleimide diene-philic monomer are added to a polymerization reaction vessel, the usage ratio of the furfuryl alcohol acrylate diene monomer and the N-phenylmaleimide diene-philic monomer is 0.8-1.2:1, the total molar number of the furfuryl alcohol acrylate diene monomer and the N-phenylmaleimide diene-philic monomer accounts for 10%-50% of the total amount of the monomers, and at the same time, 0.5%-2% of azobisisobutyronitrile accounting for the total amount of the monomers and 50%-100% of toluene solvent accounting for the total amount of the monomers are added, and under nitrogen protection, the reaction system is heated to 60°C-80°C at a rate of 2°C / min-5°C / min, and stirred at a rate of 50r / min-80r / min for 6h-12h. During the reaction, DiesA l The der reaction proceeds simultaneously, and cross-linking points are formed between the furfuryl alcohol acrylate diene monomer and the N-phenylmaleimide dienophile, thereby constructing a grid structure of the polymer to obtain a recyclable acrylate polymer.
[0013] As a further scheme of the present invention: in the step 3, graphite is placed in a muffle furnace, expanded for 10s-60s at a temperature of 800°C-1000°C to obtain expanded graphite, hollow glass microspheres with a particle size of 10um-100um are selected, the hollow glass microspheres and the expanded graphite are added to an electric stirrer for mixing, and a silane coupling agent KH550 and an ethanol solvent are added, the amount of the hollow glass microspheres accounts for 30%-70% of the total amount of the filler, the amount of the expanded graphite accounts for 30%-70% of the total amount of the filler, the amount of ethanol is in a ratio of 6-12:1 to the total amount of the hollow glass microspheres and the expanded graphite, the amount of KH550 accounts for 1%-5% of the total amount of the filler, and the mixed filler is obtained by stirring at a temperature of 20°C-30°C at a rate of 50r / min-80r / min for 10min-30min.
[0014] As a further scheme of the present invention: in the step three, the mixed filler is added into a drying oven and dried at a temperature of 80°C-100°C for 1h-2h, the dried mixed filler is added into an ethanol solvent containing 0.5%-2% polyvinyl pyrrolidone of the total amount of filler, and dispersed for 15min-30min under the action of ultrasound with a power of 100W-500W to obtain a suspension of the mixed filler, the suspension of the mixed filler is heated to 60°C-80°C at a rate of 2°C / min-5°C / min, and continued to be stirred at a rate of 50r / min-80r / min for 2h-4h, and then filtered and dried to obtain a hollow glass microsphere and expanded graphite composite filler.
[0015] As a further solution of the present invention: in the step 4, methyl methacrylate active monomer and potassium persulfate catalyst are added to the pre-emulsification kettle, the amount of methyl methacrylate accounts for 40%-60% of the total amount of the emulsion, and the amount of potassium persulfate accounts for 0.8%-1.5% of the total amount of the emulsion. Then, one third of deionized water and one quarter of polyvinyl alcohol dispersant are added to the pre-emulsification kettle, the amount of deionized water accounts for 60%-70% of the total amount of the emulsion, and the amount of polyvinyl alcohol accounts for 2%-4% of the amount of deionized water. Stir at a temperature of 20°C-30°C and a speed of 200r / min-300r / min for 20min-30min to form a pre-emulsion.
[0016] As a further solution of the present invention: in the step 4, the remaining deionized water and polyvinyl alcohol dispersant are added to the reactor, the temperature is raised to 75°C-85°C and stirred at a rate of 200r / min-300r / min, and the pre-emulsion is dripped into the reactor at a rate of 1mL / min-2mL / min while stirring. After the addition of the pre-emulsion is completed, the temperature is kept for 1h-2h. After the end, the reaction product is cooled to room temperature, filtered and dried to obtain microcapsules containing active monomers and catalysts.
[0017] As a further scheme of the present invention: in the step five, hollow glass microspheres and expanded graphite composite fillers and microcapsules containing active monomers and catalysts are added to water, and a sodium hexametaphosphate dispersant accounting for 0.5%-2% of the total mass of the coating is added, and the mixture is stirred at a rate of 1000r / min-1500r / min for 20min-30min, and then the acrylate polymer emulsion is added to the stirring kettle, followed by the addition of an organosilicon defoamer and a hydroxyethyl cellulose thickener, the amount of the organosilicon defoamer accounting for 0.1%-0.5% of the total mass of the coating, and the amount of the hydroxyethyl cellulose thickener accounting for 0.5%-3% of the total mass of the coating, and the stirring is continued at a rate of 200r / min-300r / min for 30min-60min to obtain a roughened waterproof coating.
[0018] As a further solution of the present invention: in the step 5, the roughened waterproof coating is coated on a 100mm×100mm mortar board, placed at a temperature of 20℃-25℃ and a humidity of 40%-60% for 7 days, and then the mortar is mixed and installed on a test device of a water-impermeable instrument, and sprayed at a water pressure of 0.3MPa-0.5MPa for 30 minutes, and the water seepage phenomenon on the back of the mortar board is observed. The mortar board also coated with the roughened waterproof coating is weighed and immersed in water, and taken out and weighed after soaking for 24 hours, and the waterproofness of the roughened waterproof coating is verified by the weight twice. Two identical test boxes were used, the inner surface of one test box was completely coated with roughened waterproof coating, and the other was not coated as a control. The outer surfaces of the two test boxes were irradiated with the same heat source to make the outer surface temperature reach 60℃-80℃. A thermometer was used to measure the temperature of the inner surfaces of the two test boxes to verify the thermal insulation of the roughened waterproof coating. A blade was used to make a scratch with a length of 10mm on the surface of the specimen coated with the roughened waterproof coating. The specimen was placed in an environment with a temperature of 20℃-25℃ and a humidity of 40%-60%. After 24 hours, the repair of the scratch was observed.
[0019] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are:
[0020] 1. The present invention adds hollow glass microspheres and expanded graphite composite fillers to fill the polymer matrix of the coating. The hollow glass microspheres have a spherical structure and can form a dense stack in the coating, while the expanded graphite has a flaky or worm-like structure and can be interspersed between the glass microspheres. When water molecules try to penetrate the coating, these fillers are like barriers, increasing the path length of water molecule penetration. The hollow glass microspheres themselves are a hollow structure, and the air or other gases inside them can play a buffering role in preventing water penetration, just like tiny water-proof airbags. Even if there are tiny cracks or pores on the surface of the coating, these hollow structures can temporarily prevent further water penetration, thereby improving the waterproof performance of the coating;
[0021] 2. The present invention adds self-repairing microcapsules. When the coating is slightly damaged (such as scratches, cracks, etc.), the active monomers in the microcapsules undergo polymerization under the action of the catalyst. In the microcapsule system containing methyl methacrylate active monomers and catalysts, cracks appear in the coating, the microcapsules rupture, and the active monomers come into contact with the catalyst to initiate free radical polymerization. The generated polymer can fill the cracks, thereby restoring the integrity of the coating, preventing harmful substances such as moisture from penetrating through the cracks, and extending the service life of the coating. Expanded graphite can be used as a carrier in some self-repairing systems. When combined with self-repairing components such as microcapsules containing active monomers and catalysts, the porous structure of the expanded graphite can adsorb and store microcapsules or active substances;
[0022] 3. The present invention introduces an acrylate polymer of a temperature-sensitive monomer, which can exhibit different properties under different temperature environments, thereby better adapting to various complex and changeable use environments, maintaining good flexibility under low temperature environments, and having certain stability and strength under high temperature environments, so that it can perform well in applications in different seasons and different regions. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 The present invention is a schematic diagram of a method for preparing a roughened waterproof coating based on acrylic polymer in an embodiment of the present invention. DETAILED DESCRIPTION
[0024] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0025] The present invention discloses a method for preparing a roughened waterproof coating based on an acrylic ester polymer, comprising introducing a temperature-sensitive monomer into a molecular chain of the polymer, adding a composite filler and a self-repairing microcapsule, and designing a polymer with a cross-linked network structure. The specific operation steps for preparing the roughened waterproof coating based on the acrylic ester polymer are as follows:
[0026] Step 1: introducing a temperature-sensitive monomer into the molecular chain of the acrylate polymer so that the coating has different physical and chemical properties at different temperatures;
[0027] Step 2: Design a recyclable acrylic polymer, so that the roughened waterproof coating can be decomposed into recyclable monomers under specific conditions after the service life of the roughened waterproof coating ends;
[0028] Step 3: preparing hollow glass microspheres and expanded graphite composite fillers to improve the heat insulation and waterproof properties of the roughened waterproof coating;
[0029] Step 4: Add microcapsules containing active monomers and catalysts to the coating to enable the roughened waterproof coating to self-repair when cracks appear;
[0030] Step 5: Mix the various raw materials obtained with a dispersant, a defoaming agent and a thickener to prepare a roughened waterproof coating, and test the performance of the roughened waterproof coating.
[0031] In one embodiment of the present invention: in step 1, toluene, methyl acrylate, a temperature-sensitive monomer and dodecanethiol are added to a reactor, N-isopropylacrylamide (NIPAM) is selected as the temperature-sensitive monomer, the amount of methyl acrylate accounts for 60%-90% of the total amount, the amount of NIPAM accounts for 10%-40% of the total amount, the amount of toluene accounts for 1%-5% of the total amount of the polymer, and the amount of dodecanethiol accounts for 0.1%-1% of the total amount of the polymer. The mixture is stirred at a temperature of 20°C-30°C at a rate of 300r / min-500r / min for 20min-30min to form a mixed solution, and then an initiator is added to the reactor, the temperature in the reactor is raised to 60°C-90°C, and the mixture is stirred at a rate of 100r / min-300r / min for 2h-6h under nitrogen protection to form an acrylate polymer containing NIPAM.
[0032] In one embodiment of the present invention: in step 2, an acrylate polymer containing NIPAM, a furfuryl alcohol acrylate diene monomer and an N-phenylmaleimide diene-philic monomer are added to a polymerization reaction vessel, the usage ratio of the furfuryl alcohol acrylate diene monomer and the N-phenylmaleimide diene-philic monomer is 0.8-1.2:1, the total molar number of the furfuryl alcohol acrylate diene monomer and the N-phenylmaleimide diene-philic monomer accounts for 10%-50% of the total amount of the monomers, and at the same time, 0.5%-2% of azobisisobutyronitrile accounting for the total amount of the monomers and 50%-100% of toluene solvent accounting for the total amount of the monomers are added, and under nitrogen protection, the reaction system is heated to 60°C-80°C at a rate of 2°C / min-5°C / min, and stirred at a rate of 50r / min-80r / min for 6h-12h. During the reaction, Di elsA l The der reaction proceeds simultaneously, and cross-linking points are formed between the furfuryl alcohol acrylate diene monomer and the N-phenylmaleimide dienophile, thereby constructing a grid structure of the polymer to obtain a recyclable acrylate polymer.
[0033] In one embodiment of the present invention: in step 3, graphite is placed in a muffle furnace, expanded for 10s-60s at a temperature of 800°C-1000°C to obtain expanded graphite, hollow glass microspheres with a particle size of 10um-100um are selected, the hollow glass microspheres and the expanded graphite are added to an electric stirrer for mixing, and a silane coupling agent KH550 and an ethanol solvent are added, the amount of the hollow glass microspheres accounts for 30%-70% of the total amount of the filler, the amount of the expanded graphite accounts for 30%-70% of the total amount of the filler, the amount of ethanol and the total amount of the hollow glass microspheres and the expanded graphite is 6-12:1, the amount of KH550 accounts for 1%-5% of the total amount of the filler, and the mixed filler is obtained by stirring at a temperature of 20°C-30°C at a rate of 50r / min-80r / min for 10min-30min.
[0034] In one embodiment of the present invention: in step three, the mixed filler is added into a drying oven and dried at a temperature of 80°C-100°C for 1h-2h, the dried mixed filler is added into an ethanol solvent containing 0.5%-2% polyvinyl pyrrolidone of the total amount of filler, and dispersed for 15min-30min under ultrasonic action with a power of 100W-500W to obtain a suspension of the mixed filler, the suspension of the mixed filler is heated to 60°C-80°C at a rate of 2°C / min-5°C / min, and continued to be stirred at a rate of 50r / min-80r / min for 2h-4h, and then filtered and dried to obtain a composite filler of hollow glass microspheres and expanded graphite.
[0035] In one embodiment of the present invention: in step 4, methyl methacrylate active monomer and potassium persulfate catalyst are added to a pre-emulsification kettle, the amount of methyl methacrylate accounts for 40%-60% of the total amount of the emulsion, and the amount of potassium persulfate accounts for 0.8%-1.5% of the total amount of the emulsion. Then, one-third of deionized water and one-quarter of polyvinyl alcohol dispersant are added to the pre-emulsification kettle, the amount of deionized water accounts for 60%-70% of the total amount of the emulsion, and the amount of polyvinyl alcohol accounts for 2%-4% of the amount of deionized water. Stir at a temperature of 20°C-30°C and a speed of 200r / min-300r / min for 20min-30min to form a pre-emulsion.
[0036] In one embodiment of the present invention: in step 4, the remaining deionized water and polyvinyl alcohol dispersant are added to the reactor, the temperature is raised to 75°C-85°C and stirred at a rate of 200r / min-300r / min, and the pre-emulsion is added dropwise to the reactor at a rate of 1mL / min-2mL / min while stirring. After the addition of the pre-emulsion is completed, the temperature is kept constant for 1h-2h. After the end, the reaction product is cooled to room temperature, filtered and dried to obtain microcapsules containing active monomers and catalysts.
[0037] In one embodiment of the present invention: in step five, hollow glass microspheres and expanded graphite composite fillers and microcapsules containing active monomers and catalysts are added to water, and 0.5%-2% of the total mass of the coating is added as a sodium hexametaphosphate dispersant, and stirred at a rate of 1000r / min-1500r / min for 20min-30min, and then the acrylate polymer emulsion is added to the stirring kettle, followed by adding an organosilicon defoamer and a hydroxyethyl cellulose thickener, the amount of the organosilicon defoamer accounts for 0.1%-0.5% of the total mass of the coating, and the amount of the hydroxyethyl cellulose thickener accounts for 0.5%-3% of the total mass of the coating, and stirring is continued at a rate of 200r / min-300r / min for 30min-60min to obtain a roughened waterproof coating.
[0038] In one embodiment of the present invention: in step five, the roughened waterproof coating is applied on a 100mm×100mm mortar board, placed at a temperature of 20℃-25℃ and a humidity of 40%-60% for 7 days, and then the mortar is mixed and installed on a test device of a water-impermeable instrument, and sprayed at a water pressure of 0.3MPa-0.5MPa for 30 minutes, and the water seepage phenomenon on the back of the mortar board is observed. The mortar board also coated with the roughened waterproof coating is weighed and immersed in water, and taken out and weighed after soaking for 24 hours. The waterproofness of the roughened waterproof coating is verified by the weight twice. Two identical test boxes were used, the inner surface of one test box was completely coated with roughened waterproof coating, and the other was not coated as a control. The outer surfaces of the two test boxes were irradiated with the same heat source to make the outer surface temperature reach 60℃-80℃. A thermometer was used to measure the temperature of the inner surfaces of the two test boxes to verify the thermal insulation of the roughened waterproof coating. A blade was used to make a scratch with a length of 10mm on the surface of the specimen coated with the roughened waterproof coating. The specimen was placed in an environment with a temperature of 20℃-25℃ and a humidity of 40%-60%. After 24 hours, the repair of the scratch was observed.
[0039] Example 1: Below the minimum critical solution temperature, a large number of hydrogen bonds are formed between the polymer molecular chains in the NIPAM coating and the water molecules, showing good hydrophilicity, the molecular chains are in an extended state, and the coating has good solubility in water. Due to the weak interaction between the molecular chains, the mechanical strength of the coating is relatively low, and it is easy to deform when subjected to a large external force, but this characteristic also makes it advantageous in some specific applications. In the repairable coating, the lower strength is conducive to the self-repair process after damage caused by external force. When the temperature rises above the minimum critical solution temperature, the polymer molecular chains of the NIPAM coating undergo a conformational change, the hydrogen bonding effect is weakened, the molecular chains begin to curl up, the hydrophilicity of the coating drops sharply, and the hydrophobicity increases, thereby causing a phase transition from a swollen state to a contracted state.
[0040] Example 2: When the waste coating needs to be recycled, the coating is placed under specific conditions, that is, heated to the reverse reaction temperature of the DA reaction of 120°C-160°C. At this temperature, a reversible dissociation reaction occurs at the cross-linking point of the DA adduct, the original cross-linking network structure is destroyed, and the polymer segments are disentangled and move freely. At this time, combined with appropriate physical treatment methods (such as shear force or solvent action), the polymer can be further decomposed into smaller recyclable fragments, such as monomers, oligomers, etc. These recycled monomers and oligomers can be reused in the preparation of new polymer materials after separation and purification, thereby realizing the recycling of resources.
[0041] Embodiment 3: during the coating construction, immerse the roughened roller in the coating so that the surface of the roller is fully dipped in the coating. The coating will adhere to the rubber protrusions on the surface of the roller. In the process of rolling the roller onto the surface of the base layer, as the roller rolls, the coating is brought up by the protrusions and smeared on the base layer. Due to the presence of the protrusions, the coating forms an uneven texture on the base layer, thereby achieving a roughened effect. When the roller rolls, the rubber protrusions will form tiny grooves and protrusions in the coating layer. These irregular textures increase the roughness of the coating surface, thereby achieving the purpose of roughening.
[0042] As attached Figure 1 As shown, temperature-sensitive monomers, hollow glass microspheres and expanded graphite composite fillers and self-repairing capsules are added to the roughened waterproof coating to improve the heat insulation, waterproofness and service life of the roughened waterproof coating.
[0043] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.
[0044] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0045] The above contents are merely examples and explanations of the present invention. Various modifications or additions to the specific embodiments described or replacements in similar ways by technicians in the technical field shall fall within the protection scope of the present invention as long as they do not deviate from the invention or exceed the scope defined by the claims.
[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A method for preparing a roughened waterproof coating based on acrylic polymer, comprising introducing a temperature-sensitive monomer into the molecular chain of the polymer, adding a composite filler and a self-repairing microcapsule, and designing a polymer with a cross-linked network structure, characterized in that: The specific steps of preparing the acrylic polymer roughened waterproof coating are as follows: Step 1: introducing a temperature-sensitive monomer into the molecular chain of the acrylate polymer so that the coating has different physical and chemical properties at different temperatures; Step 2: Design a recyclable acrylic polymer, so that the roughened waterproof coating can be decomposed into recyclable monomers under specific conditions after the service life of the roughened waterproof coating ends; Step 3: preparing hollow glass microspheres and expanded graphite composite fillers to improve the heat insulation and waterproof properties of the roughened waterproof coating; Step 4: Add microcapsules containing active monomers and catalysts to the coating to enable the roughened waterproof coating to self-repair when cracks appear; Step 5: Mix the various raw materials obtained with a dispersant, a defoaming agent and a thickener to prepare a roughened waterproof coating, and test the performance of the roughened waterproof coating.
2. The method for preparing a roughened waterproof coating based on acrylic polymer according to claim 1, characterized in that: In the step 1, toluene, methyl acrylate, a temperature-sensitive monomer and dodecanethiol are added to a reactor, N-isopropylacrylamide (NIPAM) is selected as the temperature-sensitive monomer, the amount of methyl acrylate accounts for 60%-90% of the total amount, the amount of NIPAM accounts for 10%-40% of the total amount, the amount of toluene accounts for 1%-5% of the total amount of the polymer, and the amount of dodecanethiol accounts for 0.1%-1% of the total amount of the polymer. The mixture is stirred at a temperature of 20° C. to 30° C. at a rate of 300 r / min to 500 r / min for 20 min to 30 min to form a mixed solution, and then an initiator is added to the reactor, the temperature in the reactor is raised to 60° C. to 90° C., and the mixture is stirred at a rate of 100 r / min to 300 r / min for 2 h to 6 h under nitrogen protection to form an acrylate polymer containing NIPAM.
3. The method for preparing a roughened waterproof coating based on acrylic polymer according to claim 1, characterized in that: In the step 2, an acrylate polymer containing NIPAM, a furfuryl alcohol acrylate diene monomer and an N-phenylmaleimide dienophile monomer are added to a polymerization reaction container, wherein the ratio of the furfuryl alcohol acrylate diene monomer to the N-phenylmaleimide dienophile monomer is 0.8-1.2:1, and the total molar number of the furfuryl alcohol acrylate diene monomer and the N-phenylmaleimide dienophile monomer accounts for 10%-50% of the total amount of the monomers. At the same time, 0.5%-2% of azobisisobutyronitrile is added to the total amount of the monomers. and toluene solvent accounting for 50%-100% of the total monomer volume, under nitrogen protection, the reaction system is heated to 60°C-80°C at a rate of 2°C / min-5°C / min, and stirred at a rate of 50r / min-80r / min for 6h-12h. During the reaction, Diels-Alder reaction is carried out simultaneously, cross-linking points are formed between furfuryl alcohol acrylate diene monomers and N-phenylmaleimide dienophiles, and a grid structure of the polymer is constructed to obtain a recyclable acrylate polymer.
4. The method for preparing a roughened waterproof coating based on acrylic polymer according to claim 1, characterized in that: In the step 3, graphite is placed in a muffle furnace, expanded for 10s-60s at a temperature of 800°C-1000°C to obtain expanded graphite, hollow glass microspheres with a particle size of 10um-100um are selected, the hollow glass microspheres and the expanded graphite are added into an electric stirrer for mixing, and a silane coupling agent KH550 and an ethanol solvent are added, the amount of the hollow glass microspheres accounts for 30%-70% of the total amount of filler, the amount of the expanded graphite accounts for 30%-70% of the total amount of filler, the amount of ethanol and the total amount of the hollow glass microspheres and the expanded graphite are in a ratio of 6-12:1, the amount of KH550 accounts for 1%-5% of the total amount of filler, and the mixed filler is obtained by stirring at a temperature of 20°C-30°C at a rate of 50r / min-80r / min for 10min-30min.
5. The method for preparing a roughened waterproof coating based on acrylic polymer according to claim 4, characterized in that: In the step three, the mixed filler is added into a drying oven and dried at a temperature of 80°C-100°C for 1h-2h, the dried mixed filler is added into an ethanol solvent containing 0.5%-2% polyvinyl pyrrolidone of the total amount of filler, and dispersed for 15min-30min under the action of ultrasound with a power of 100W-500W to obtain a suspension of the mixed filler, the suspension of the mixed filler is heated to 60°C-80°C at a rate of 2°C / min-5°C / min, and continued to be stirred at a rate of 50r / min-80r / min for 2h-4h, and then filtered and dried to obtain a hollow glass microsphere and expanded graphite composite filler.
6. The method for preparing a roughened waterproof coating based on acrylic polymer according to claim 1, characterized in that: In the step 4, methyl methacrylate active monomer and potassium persulfate catalyst are added to the pre-emulsification kettle, the amount of methyl methacrylate accounts for 40%-60% of the total amount of the emulsion, and the amount of potassium persulfate accounts for 0.8%-1.5% of the total amount of the emulsion. Then, one third of deionized water and one quarter of polyvinyl alcohol dispersant are added to the pre-emulsification kettle, the amount of deionized water accounts for 60%-70% of the total amount of the emulsion, and the amount of polyvinyl alcohol accounts for 2%-4% of the amount of deionized water. Stirring is carried out at a temperature of 20° C. to 30° C. at a rate of 200 r / min to 300 r / min for 20 min to 30 min to form a pre-emulsion.
7. The method for preparing a roughened waterproof coating based on acrylic polymer according to claim 6, characterized in that: In the step 4, the remaining deionized water and polyvinyl alcohol dispersant are added to the reactor, the temperature is raised to 75° C.-85° C. and stirred at a rate of 200 r / min-300 r / min, and the pre-emulsion is dripped into the reactor at a rate of 1 mL / min-2 mL / min while stirring. After the pre-emulsion is dripped, the temperature is kept for 1 h-2 h. After the reaction product is cooled to room temperature, filtered and dried to obtain microcapsules containing active monomers and catalysts.
8. The method for preparing a roughened waterproof coating based on acrylic polymer according to claim 1, characterized in that: In the step five, hollow glass microspheres, expanded graphite composite fillers and microcapsules containing active monomers and catalysts are added to water, and a sodium hexametaphosphate dispersant accounting for 0.5%-2% of the total mass of the coating is added, and the mixture is stirred at a rate of 1000r / min-1500r / min for 20min-30min, and then the acrylate polymer emulsion is added to the stirring kettle, followed by the addition of an organosilicon defoamer and a hydroxyethyl cellulose thickener, wherein the amount of the organosilicon defoamer accounts for 0.1%-0.5% of the total mass of the coating, and the amount of the hydroxyethyl cellulose thickener accounts for 0.5%-3% of the total mass of the coating, and stirring is continued at a rate of 200r / min-300r / min for 30min-60min to obtain a roughened waterproof coating.
9. The method for preparing a roughened waterproof coating based on acrylic polymer according to claim 1, characterized in that: In the step 5, the roughened waterproof coating is applied on a 100mm×100mm mortar board, placed at a temperature of 20°C-25°C and a humidity of 40%-60% for 7 days, and then the mortar is mixed and installed on the test device of the impermeability meter, and sprayed at a water pressure of 0.3MPa-0.5MPa for 30 minutes, and the water seepage phenomenon on the back of the mortar board is observed. The mortar board also coated with the roughened waterproof coating is weighed and immersed in water, and taken out and weighed after soaking for 24 hours. The waterproofness of the roughened waterproof coating is verified by the weight twice, and two identical The inner surface of one test box was completely coated with roughened waterproof coating, and the other was not coated as a control. The outer surfaces of the two test boxes were irradiated with the same heat source to make the outer surface temperature reach 60℃-80℃. A thermometer was used to measure the temperature of the inner surfaces of the two test boxes to verify the thermal insulation of the roughened waterproof coating. A blade was used to make a scratch with a length of 10mm on the surface of the specimen coated with the roughened waterproof coating. The specimen was placed in an environment with a temperature of 20℃-25℃ and a humidity of 40%-60%. After 24 hours, the repair of the scratch was observed.