A water-based acrylic resin coating for building and its preparation method

Abstract

This invention relates to the field of coating technology, and discloses a water-based acrylic resin coating for construction and its preparation method. This coating is prepared by mixing water-based acrylic resin as the film-forming substance with modified fiber additives and other auxiliary materials. By modifying the surface of magnesia fibers with the presence of polymeric macromolecules, the compatibility between magnesia fibers and acrylic resin is improved, allowing the magnesia fibers to leverage their advantages as a fiber additive, thereby enhancing the toughness and strength of the coating. Furthermore, the polymeric macromolecules contain a rigid triphenylene heterocyclic structure, which increases the hardness of the coating, reduces the width of scratches on the coating surface, and thus effectively improves the wear resistance of the coating.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to a water-based acrylic resin coating for building and its preparation method. Background Technology

[0002] With the booming development of the construction industry and the increasing demands for environmental protection and building quality, architectural coatings, as important materials for building decoration and protection, are undergoing a transformation from traditional solvent-based coatings to environmentally friendly water-based coatings. Water-based acrylic resin coatings, with their superior performance and environmentally friendly characteristics, have stood out among numerous architectural coatings and become a highly favored product in the modern construction field.

[0003] Waterborne acrylic resin coatings are mainly composed of waterborne acrylic resin, pigments, fillers, additives, and water. Because waterborne acrylic resin coatings use water as the dispersion medium and contain almost no organic solvents, they significantly reduce environmental pollution and harm to human health during production, application, and use, meeting modern environmental protection requirements. Furthermore, waterborne acrylic resin coatings have excellent application properties, allowing for various application methods such as brushing, rolling, and spraying. They dry quickly, have short application cycles, and improve application efficiency.

[0004] However, conventional waterborne acrylic resin coatings suffer from poor toughness, and the film formed after drying is prone to cracking. Furthermore, the coating has low hardness, making it susceptible to wear and tear, leading to a loss of protective effect and a short service life. Current technologies typically improve coating performance by adding additives such as glass fibers, utilizing the fiber's tensile properties. However, these inorganic additives present interfacial problems with the waterborne acrylic resin, hindering their efficient utilization.

[0005] Based on this, the present invention provides a water-based acrylic resin coating with good comprehensive properties such as toughness and wear resistance, which can be directly used in the construction field. Summary of the Invention

[0006] In order to solve the problems mentioned in the background art, the purpose of this invention is to provide a water-based acrylic resin coating for building and a method for preparing the same.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A water-based acrylic resin coating for construction, comprising the following raw materials by weight:

[0009]

[0010] The modified fiber additive is prepared by grafting polymeric macromolecular substances onto the surface of brucite fibers.

[0011] As a further aspect of the present invention, the method for preparing the aqueous acrylic resin emulsion is as follows:

[0012] Step 1: According to the weight parts, add 30-40 parts of methyl methacrylate, 20-30 parts of butyl acrylate, 5-10 parts of glycidyl methacrylate and 1-2 parts of sodium dodecyl sulfate to 100-120 parts of deionized water, and mechanically stir evenly to form a precursor material.

[0013] The second step is to add 0.5-1.5 parts of initiator to the precursor material. After adding, stir well, then raise the temperature to 75-82℃, and continue to maintain the temperature and stir for 6-12 hours. After that, stop heating, cool down and discharge the material.

[0014] As a further aspect of the present invention, the initiator is any one of azobisisobutyronitrile, azobisisoheptanenitrile, or azobisisopropylimidazoline.

[0015] As a further aspect of the present invention, the preparation method of the modified fiber additive includes the following steps:

[0016] Step 1: Add magnesia fiber to tetrahydrofuran and sonicate for 10-30 minutes. Then add halogenating agent and acid-binding agent to the resulting dispersion. After the addition is complete, raise the temperature to 40-50℃ and stir for 4-8 hours. Then discharge the material, wash and vacuum dry it to obtain halo-substituted magnesia fiber.

[0017] Step 2: Add halomagnesia fiber to N,N-dimethylformamide and ultrasonically disperse until a uniform dispersion is formed. Then, add 2,3-dihydroxysuccinic acid and catalyst to the dispersion. After the addition is complete, raise the temperature to 60-70℃ and keep it at that temperature for 2-4 hours. Then, add chain extender 2,7-dibromotriene and carry out chain extension polymerization at 90-100℃ for 12-24 hours. After that, stop heating, cool down and discharge the material. Centrifuge to remove the solid material, and after washing and vacuum drying, the modified fiber additive can be obtained.

[0018] As a further embodiment of the present invention, the halogenating agent is any one of chloroacetyl chloride, bromoacetyl bromide, or 4-bromobutyryl chloride.

[0019] As a further embodiment of the present invention, the acid-binding agent is triethylamine or pyridine.

[0020] As a further aspect of the present invention, the catalyst is an aqueous solution of sodium hydroxide with a mass fraction of 15-30%.

[0021] As a further embodiment of the present invention, the mass ratio of 2,3-dihydroxysuccinic acid, halophyllite fiber and 2,7-dibromotriene is 1-1.5:1:2-3.5.

[0022] In the above technical solution, firstly, under the action of an acid-binding agent, a halogenating reagent is used to modify the surface of magnesia fiber, introducing halogen substituents onto the surface of the magnesia fiber to obtain halogenated magnesia fiber. Then, under the action of a catalyst, the active hydroxyl substituents in the structure of the linker 2,3-dihydroxysuccinic acid can undergo a substitution reaction with the halogen substituents of the halogenated magnesia fiber. Subsequently, the remaining linker 2,3-dihydroxysuccinic acid in the system can undergo a continuous substitution reaction with the chain extender 2,7-dibromotriene, thereby forming a polymeric macromolecule linked by ether bonds on the surface of the magnesia fiber, thus obtaining a modified fiber additive.

[0023] As a further embodiment of the present invention, the pigment is any one of titanium dioxide, carbon black, or calcium carbonate; the defoamer is NYK-065; the leveling agent is BYK-310 or BYK-315N; and the thickener is sodium hydroxyethyl cellulose.

[0024] A method for preparing a water-based acrylic resin coating for building applications includes the following steps:

[0025] Step S1: Weigh and prepare all raw materials according to the weight proportions. Then add water-based acrylic resin emulsion, modified fiber additive, pigment, leveling agent and thickener to deionized water. Mix evenly by mechanical stirring at a speed of 1000-1500 r / min at room temperature to form a premix.

[0026] Step S2: Add the defoamer to the premix, control the speed to 300-500 r / min, stir for 10-20 min, let stand for 1-2 h, collect the material, and it is ready.

[0027] The beneficial effects of this invention are:

[0028] This invention modifies the surface of brucite fibers by modifying it with polymeric macromolecules linked by ether bonds, thus producing a modified fiber additive. Because the polymeric macromolecules can form an organic-inorganic "transition" structure between the brucite fibers and acrylic resin, and because the polymeric macromolecules contain active carboxyl substituents, they can interact with the glycidyl groups in the acrylic resin structure during the subsequent heat curing of the coating. Therefore, this significantly improves the compatibility between the brucite fibers and the acrylic resin, allowing the brucite fibers to fully utilize their advantages as a fiber additive, thereby improving the toughness and strength of the coating. Furthermore, the polymeric macromolecules also contain a rigid triphenylene heterocyclic structure, which increases the hardness of the coating, reduces the width of scratches on the coating surface, and thus effectively improves the wear resistance of the coating.

[0029] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 The images are scanning electron microscope (SEM) images of brucite fiber and modified fiber additives, where (A) is brucite fiber and (B) is modified fiber additive. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1:

[0034] A water-based acrylic resin coating for construction, comprising the following raw materials by weight:

[0035]

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

[0037] Step S1: Weigh and prepare all raw materials according to the weight proportions. Then add water-based acrylic resin emulsion, modified fiber additive, pigment titanium dioxide, leveling agent BYK-310 and thickener to deionized water. Mix evenly by mechanical stirring at 1000 r / min at room temperature to form a premix.

[0038] Step S2: Add defoamer NYK-065 to the premix, control the speed to 300r / min, stir for 20min, let stand for 1h, collect the material, and it is ready.

[0039] Example 2:

[0040] A water-based acrylic resin coating for construction, comprising the following raw materials by weight:

[0041]

[0042]

[0043] The preparation method of the coating includes the following steps:

[0044] Step S1: Weigh and prepare all raw materials according to the weight proportions. Then add water-based acrylic resin emulsion, modified fiber additive, pigment calcium carbonate, leveling agent BYK-315N and thickener to deionized water. Mix evenly by mechanical stirring at 1200r / min at room temperature to form a premix.

[0045] Step S2: Add defoamer NYK-065 to the premix, control the speed to 400 r / min, stir for 15 min, let stand for 1 h, collect the material, and it is ready.

[0046] Example 3:

[0047] A water-based acrylic resin coating for construction, comprising the following raw materials by weight:

[0048]

[0049]

[0050] The preparation method of the coating includes the following steps:

[0051] Step S1: Weigh and prepare all raw materials according to the weight proportions. Then add water-based acrylic resin emulsion, modified fiber additive, pigment calcium carbonate, leveling agent BYK-315N and thickener to deionized water. Mix evenly by mechanical stirring at 1500r / min at room temperature to form a premix.

[0052] Step S2: Add defoamer NYK-065 to the premix, control the speed to 500 r / min, stir for 10 min, let stand for 2 h, collect the material, and it is ready.

[0053] The modified fiber additives in the above embodiments were prepared using the following method:

[0054] Step 1: Add 2.8g of magnesia fiber to tetrahydrofuran and sonicate for 20min. Then add 1.5g of 4-bromobutyryl chloride and 0.1g of pyridine to the resulting dispersion. After the addition is complete, raise the temperature to 45℃ and stir for 6h. Then discharge the material, wash and vacuum dry it to obtain halo-substituted magnesia fiber.

[0055] Step 2: Add 1.6g of halomagnesia fiber to N,N-dimethylformamide and ultrasonically disperse until a uniform dispersion is formed. Then, add 2g of 2,3-dihydroxysuccinic acid as a linker and 5mL of 20% sodium hydroxide aqueous solution to the dispersion. After the addition is complete, raise the temperature to 65℃ and keep it at that temperature for 3 hours. Then, add 5g of chain extender 2,7-dibromotriene and carry out chain extension polymerization at 95℃ for 18 hours. After that, stop heating, cool down and discharge the material. Centrifuge to remove the solid material, and after washing and vacuum drying, the modified fiber additive can be obtained.

[0056] Figure 1 The images show scanning electron microscope (SEM) images of brucite fiber and modified fiber additives. (A) shows brucite fiber and (B) shows modified fiber additive. It can be observed from the images that the surface of brucite fiber is smooth and flat with no obvious special morphology, while the surface of modified fiber additive clearly shows a coating structure. This coating structure is caused by the modification of the surface of brucite fiber with polymer macromolecules.

[0057] Comparative Example 1:

[0058] A water-based acrylic resin coating for construction, comprising the following raw materials by weight:

[0059]

[0060] The preparation method of the coating includes the following steps:

[0061] Step S1: Weigh and prepare all raw materials according to the weight proportions. Then add water-based acrylic resin emulsion, magnesium hydroxide fiber, pigment calcium carbonate, leveling agent BYK-315N and thickener to deionized water. Mix evenly by mechanical stirring at 1200r / min at room temperature to form a premix.

[0062] Step S2: Add defoamer NYK-065 to the premix, control the speed to 400 r / min, stir for 15 min, let stand for 1 h, collect the material, and it is ready.

[0063] Comparative Example 2:

[0064] A water-based acrylic resin coating for construction, comprising the following raw materials by weight:

[0065]

[0066] The preparation method of the coating includes the following steps:

[0067] Step S1: Weigh and prepare all raw materials according to the weight proportions. Then add water-based acrylic resin emulsion, pigment calcium carbonate, leveling agent BYK-315N and thickener to deionized water. Mix evenly by mechanical stirring at 1200r / min at room temperature to form a premix.

[0068] Step S2: Add defoamer NYK-065 to the premix, control the speed to 400 r / min, stir for 15 min, let stand for 1 h, collect the material, and it is ready.

[0069] The aqueous acrylic resin emulsions in the above embodiments and comparative examples were prepared using the following method:

[0070] Step 1: According to the weight proportions, add 35 parts methyl methacrylate, 24 parts butyl acrylate, 6 parts glycidyl methacrylate and 1.5 parts sodium dodecyl sulfate to 120 parts deionized water and stir mechanically until uniform to form a precursor material.

[0071] The second step is to add 1 part of initiator azobisisobutyronitrile to the precursor. After adding the precursor, stir well. Then raise the temperature to 78°C and continue to heat and stir for 9 hours. After that, stop heating, cool down and discharge the material.

[0072] Test example:

[0073] The coatings used in the examples and comparative examples were prepared into coatings that met specifications, and various performance tests were conducted. The results are shown in the table below:

[0074]

[0075] The test methods for flexibility are based on standard GB / T 1731-1993; the test methods for impact performance are based on standard GB / T1732-2020; the test methods for pencil hardness are based on standard GB / T6739-1996; and the test methods for abrasion resistance are based on standard GB / T1768-2006.

[0076] Analysis of the test results shows that when unmodified magnesia fiber is used directly as an additive, the various properties of the material are significantly reduced compared to the example. This is partly due to the compatibility problem between magnesia fiber and acrylic resin, making it difficult to fully exert its advantages. On the other hand, the rigid structure of the polymeric macromolecule is lost, making it difficult to achieve a significant hardness enhancement effect, resulting in a simultaneous decrease in wear resistance.

[0077] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely to aid in understanding the method and core ideas of the present invention, including the best mode, and to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to those expressed in the claims, or if they include equivalent structural elements that are not substantially different from those expressed in the claims, then these other embodiments should also be included within the scope of the claims.

[0078] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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 water-based acrylic resin coating for construction, characterized in that, By weight, it includes the following ingredients: 45-55 parts of water-based acrylic resin emulsion; Modified fiber additives: 2.5-6.5 parts; 5-10 parts pigment; 0.5-1.5 parts of defoamer; Leveling agent 0.5-1 part; Thickener 1-3 parts; 30-40 parts deionized water; The preparation method of the modified fiber additive includes the following steps: Step 1: Under the action of an acid binder, the surface of brucite fiber is modified with a halogenating reagent to obtain halo-substituted brucite fiber. Step 2: Using N,N-dimethylformamide as a medium and 2,3-dihydroxysuccinic acid as a linker, it is linked with halomagnesia fiber under the action of a catalyst. Then, 2,7-dibromotriene is added as a chain extender to carry out chain extension polymerization, thereby obtaining the modified fiber additive. The halogenating agent is any one of chloroacetyl chloride, bromoacetyl bromide, or 4-bromobutyryl chloride.

2. The water-based acrylic resin coating for building construction according to claim 1, characterized in that, The preparation method of the aqueous acrylic resin emulsion is as follows: Step 1: According to the weight parts, add 30-40 parts of methyl methacrylate, 20-30 parts of butyl acrylate, 5-10 parts of glycidyl methacrylate and 1-2 parts of sodium dodecyl sulfate to 100-120 parts of deionized water, and mechanically stir evenly to form a precursor material. The second step is to add 0.5-1.5 parts of initiator to the precursor material. After adding the initiator, stir well. Then raise the temperature to 75-82℃ and continue to maintain the temperature and stir for 6-12 hours before stopping the heating and cooling down to discharge the material.

3. The water-based acrylic resin coating for building construction according to claim 2, characterized in that, The initiator is any one of azobisisobutyronitrile, azobisisoheptanenitrile, or azobisisopropylimidazoline.

4. The water-based acrylic resin coating for building construction according to claim 1, characterized in that, The acid-binding agent is triethylamine or pyridine.

5. A water-based acrylic resin coating for building construction according to claim 1, characterized in that, The catalyst is an aqueous solution of sodium hydroxide with a mass fraction of 15-30%.

6. The water-based acrylic resin coating for building construction according to claim 1, characterized in that, The mass ratio of 2,3-dihydroxysuccinic acid, halophyllite fiber, and 2,7-dibromotriene is 1-1.5:1:2-3.

5.

7. A water-based acrylic resin coating for building construction according to claim 1, characterized in that, The pigment is any one of titanium dioxide, carbon black, or calcium carbonate; the defoamer is BYK-065; the leveling agent is BYK-310 or BYK-315N; and the thickener is sodium hydroxyethyl cellulose.

8. A method for preparing a water-based acrylic resin coating for building as described in claim 1, characterized in that, Includes the following steps: Step S1: Weigh and prepare all raw materials according to the weight proportions. Then add water-based acrylic resin emulsion, modified fiber additive, pigment, leveling agent and thickener to deionized water. Mix evenly by mechanical stirring at a speed of 1000-1500 r / min at room temperature to form a premix. Step S2: Add the defoamer to the premix, control the speed to 300-500 r / min, stir for 10-20 min, let stand for 1-2 h, and collect the material.

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