Acrylic topcoat for floor and preparation method thereof

Abstract

The present invention relates to an acrylic topcoat for ground and a preparation method thereof, belonging to the technical field of topcoats, wherein the topcoat comprises component A and component B; the component A comprises: hydroxy acrylic dispersion, triethoxymethylsilane, [8-(epoxypropyloxy)-n-octyl]trimethoxysilane, 1-benzyl-2-methylimidazole, composite filler, leveling agent, dispersant, defoamer and adhesion promoter; the component B comprises: curing agent and propylene glycol diacetate. The present invention uses modified sericite, bentonite and glass microbeads as composite fillers, synergistically making the prepared topcoat have excellent liquid medium resistance, and at the same time, the present invention uses perfluorododecyl trichlorosilane to graft sericite, thereby strengthening the liquid medium resistance of the topcoat. In addition, triethoxymethylsilane, [8-(epoxypropyloxy)-n-octyl]trimethoxysilane and 1-benzyl-2-methylimidazole are used to effectively increase the wear resistance of the topcoat.

Description

Technical Field

[0001] The invention belongs to the technical field of topcoats, and in particular relates to an acrylic topcoat for ground and a preparation method thereof. Background Art

[0002] With the rapid development of modern industry, commerce, sports facilities and other fields, the performance requirements for floor topcoats are increasing. Especially in environments that need to withstand high-load traffic, frequent use and contact with liquid media, the wear resistance and liquid medium resistance of the floor become key considerations. As a high-performance coating, acrylic topcoat has gradually become the first choice for floor protection materials due to its outstanding physical and mechanical properties and environmental protection. However, the existing acrylic topcoats on the market are often prone to problems such as coating peeling, discoloration or corrosion when exposed to liquid media such as water, acids and alkalis, which seriously affects their service life and aesthetics. At the same time, in high-load pedestrian or traffic wear environments, the wear resistance of ordinary acrylic topcoats cannot meet the needs of long-term use.

[0003] Therefore, it is of great practical significance to provide an acrylic topcoat having excellent liquid medium resistance and abrasion resistance. Summary of the invention

[0004] The purpose of the present invention is to provide an acrylic topcoat for floor and a preparation method thereof, which solves the problem of poor liquid medium resistance and wear resistance of the topcoat in the prior art.

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

[0006] An acrylic topcoat for floor, the topcoat comprising component A and component B in a mass ratio of 4.5-5:1;

[0007] The A component includes the following raw materials in parts by weight:

[0008] Hydroxylated acrylic acid dispersion 70-80 parts by weight

[0009] 4.5-4.8 parts by weight of triethoxymethylsilane

[0010]

[0011] The B component includes the following raw materials in parts by weight:

[0012] Curing agent 7-8 parts by weight

[0013] Propylene glycol diacetate 1-2 parts by weight.

[0014] As a preferred technical solution of the present invention, the topcoat also includes deionized water.

[0015] As a preferred technical solution of the present invention, the leveling agent in component A includes BYK-371, produced by BYK of Germany; the dispersant includes BYK-P220, produced by BYK of Germany; the defoamer includes BYK-028, produced by BYK of Germany; the adhesion promoter includes TEGO AddBond DS1300, produced by Evonik.

[0016] As a preferred technical solution of the present invention, the hydroxylated acrylic acid dispersion model is 5042G, with a hydroxyl content of 4.2%, purchased from Guangdong Huaguoshan Environmental Protection Technology Co., Ltd.

[0017] As a preferred technical solution of the present invention, the curing agent in component B includes hexamethylene diisocyanate.

[0018] As a preferred technical solution of the present invention, the composite filler includes modified sericite, bentonite and glass microspheres.

[0019] Furthermore, the mass ratio of the modified sericite, bentonite and glass microspheres is 2-3:1-2:3-4.

[0020] Furthermore, the glass microspheres have a wall thickness of 1-2 μm and a particle size of 200 μm.

[0021] Furthermore, the preparation method of the modified sericite is: ethanol solution, sericite and ammonia water are mixed and stirred, and then tetraethyl orthosilicate is added and stirred at a controlled speed to obtain a mixture C, and perfluorododecyltrichlorosilane and n-hexane are added to the mixture C after magnetic stirring and then stirred, and the mixture is dried at a controlled temperature, ground, and sieved to obtain the modified sericite.

[0022] Furthermore, the usage ratio of the ethanol solution, sericite, ammonia water, tetraethyl orthosilicate, perfluorododecyltrichlorosilane and n-hexane is 85-90 mL: 1-1.5 g: 4-4.2 mL: 0.6-0.7 mL: 0.3-0.4 g: 15-29 g.

[0023] Furthermore, the mass fraction of the ethanol solution is 85-90%.

[0024] Furthermore, the mixing and stirring time is 8-10 minutes; the speed of the speed-controlled stirring is 1000-1100 rpm, and the time is 30-35 minutes; the time of the magnetic stirring is 30-40 minutes; the time of the re-stirring is 24-26 hours; the temperature of the temperature-controlled drying is 80-85°C; and the screening is through a 200-mesh sieve.

[0025] A method for preparing an acrylic topcoat for floor, the method comprising the following steps:

[0026] S1, mixing the hydroxy acrylic acid dispersion and deionized water and stirring at a controlled speed to obtain a mixture A for standby use; mixing [8-(epoxypropyloxy)-n-octyl]trimethoxysilane and triethoxymethylsilane, adjusting the pH, adding the mixture A and stirring, cooling, and adding 1-benzyl-2-methylimidazole at a controlled speed and stirring to obtain a mixture B;

[0027] S2, adding composite filler, leveling agent, dispersant, defoamer and adhesion promoter to mixed material B in sequence, controlling the speed and stirring evenly, to obtain component A;

[0028] S3, mixing the curing agent and propylene glycol diacetate under a nitrogen environment, stirring at a controlled speed, and filtering to obtain component B;

[0029] S4. Mix component A and component B evenly, then add deionized water and mix evenly to obtain a finished topcoat product.

[0030] As a preferred technical solution of the present invention, the mass ratio of the hydroxylated acrylic acid dispersion to deionized water in step S1 is 7-8:3-4; the mass ratio of component A to deionized water in step S4 is 1:0.1-0.2.

[0031] As a preferred technical solution of the present invention, the speed of the controlled stirring in step S1 is 500-550r / min; the pH is adjusted by using a 10% hydrochloric acid solution to adjust the pH to 2-3; the stirring time is 2-3h; the cooling is cooled to 5-8°C in an ice water bath; the controlled stirring speed of adding 1-benzyl-2-methylimidazole is 1100-1200rmp, and the stirring time is 1-1.5h.

[0032] As a preferred technical solution of the present invention, the speed of the speed control in step S2 is 800-1000 rpm.

[0033] As a preferred technical solution of the present invention, the speed of the speed control in step S3 is 500-600rmp; and the filtering is performed using 160-mesh silk cloth.

[0034] Beneficial effects of the present invention:

[0035] (1) The present invention uses modified sericite, bentonite and glass microspheres together, and the synergistic effect makes the prepared topcoat have excellent resistance to liquid media, so that the surface of the object after using the topcoat is not easy to bubble, wrinkle and fall off. This is because the present invention uses sericite and bentonite, which are layered structures, and have good physical shielding effects to a certain extent, which can effectively extend the penetration path of corrosive media and make it difficult for foreign liquids to penetrate. On this basis, glass microspheres are added, so that after the topcoat containing glass microspheres is dried, the glass microspheres in the topcoat can be arranged to form a hollow air layer to further enhance the ability to prevent foreign substances from penetrating; at the same time, the present invention also uses perfluorododecyl trichlorosilane to graft sericite, and the fluorine element is introduced into the system, which further improves the density of the sericite surface, thereby effectively making the topcoat have higher liquid repellency.

[0036] (2) The present invention uses a hydroxy acrylic dispersion as the main matrix, and adds triethoxymethylsilane and [8-(epoxypropyloxy)-n-octyl]trimethoxysilane. Triethoxymethylsilane can be effectively hydrolyzed to form silanol with a hydroxyl group. At this time, a network structure is formed in the system. On this basis, 1-benzyl-2-methylimidazole is added to [8-(epoxypropyloxy)-n-octyl]trimethoxysilane for a ring-opening reaction, which further strengthens the network structure of the topcoat, thereby improving the topcoat's ability to resist external wear, that is, increasing the wear resistance of the topcoat, and effectively solving the problem that the acrylic court floor generally used for courts is not suitable for parking and that car tires easily leave traces and thus wear the ground after passing by. DETAILED DESCRIPTION

[0037] The following will be combined with 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.

[0038] The hydroxy acrylic dispersion used in the embodiment of the present invention is model 5042G, purchased from Guangdong Huaguoshan Environmental Protection Technology Co., Ltd.; the manufacturers of BYK-371, BYK-P220 and BYK-028 used are all BYK of Germany; the manufacturer of TEGO AddBond DS1300 used is Evonik; no further details will be given later.

[0039] Example 1

[0040] An acrylic topcoat for floor, the topcoat comprising component A and component B in a mass ratio of 4.5:1;

[0041] The A component includes the following raw materials in parts by weight:

[0042]

[0043] The B component includes the following raw materials in parts by weight:

[0044] Hexamethylene diisocyanate 7.5 parts by weight

[0045] 1 part by weight of propylene glycol diacetate;

[0046] The composite filler comprises modified sericite, bentonite and glass microspheres in a mass ratio of 3:1.5:4;

[0047] The glass microspheres have a wall thickness of 1 μm and a particle size of 200 μm;

[0048] The topcoat also includes deionized water.

[0049] The preparation method of the modified sericite comprises: mixing an ethanol solution with a mass fraction of 85%, sericite and ammonia water with a mass fraction of 20% and stirring for 10 minutes, then adding tetraethyl orthosilicate and stirring at a speed of 1050 rpm for 30 minutes to obtain a mixture C, adding perfluorododecyltrichlorosilane and n-hexane to the mixture C after magnetic stirring for 30 minutes and stirring for 25 hours, drying at a temperature of 85° C., grinding, and passing through a 200-mesh sieve to obtain the modified sericite;

[0050] Among them, the usage ratio of the ethanol solution, sericite, ammonia water, tetraethyl orthosilicate, perfluorododecyltrichlorosilane and n-hexane is 87.5mL:1.5g:4.1mL:0.6mL:0.3g:15g.

[0051] A method for preparing an acrylic topcoat for floor, the method comprising the following steps:

[0052] S1. Mix the hydroxy acrylic acid dispersion and deionized water and stir at a controlled speed of 525 r / min to obtain a mixture A for standby use; mix [8-(epoxypropyloxy)-n-octyl]trimethoxysilane, triethoxymethylsilane and to obtain a mixture A, adjust the pH to 3 with a 10% hydrochloric acid solution, add the mixture A and stir for 2 h, cool to 8° C. in an ice water bath after stirring, add 1-benzyl-2-methylimidazole at a controlled speed of 1100 rmp and stir for 1 h to obtain a mixture B;

[0053] The mass ratio of the hydroxylated acrylic acid dispersion to deionized water is 7.5:4;

[0054] S2. Add modified sericite, bentonite, glass beads, BYK-371, BYK-P220, BYK-028 and TEGO AddBond DS1300 to mixed material B in sequence and stir evenly at a controlled speed of 800 rpm to obtain component A.

[0055] S3, under a nitrogen environment, hexamethylene diisocyanate and propylene glycol diacetate were mixed and stirred at a controlled speed of 600 rpm, and filtered through a 160-mesh silk cloth to obtain component B;

[0056] S4, mixing component A and component B evenly, then adding deionized water and mixing evenly to obtain a finished topcoat product;

[0057] The mass ratio of the A component to deionized water is 1:0.15.

[0058] Example 2

[0059] An acrylic topcoat for floor, the topcoat comprising component A and component B in a mass ratio of 4.8:1;

[0060] The A component includes the following raw materials in parts by weight:

[0061]

[0062] The B component includes the following raw materials in parts by weight:

[0063] Hexamethylene diisocyanate 8 parts by weight

[0064] Propylene glycol diacetate 1.5 parts by weight;

[0065] The composite filler comprises modified sericite, bentonite and glass microspheres in a mass ratio of 2:2:3;

[0066] The glass microspheres have a wall thickness of 1 μm and a particle size of 200 μm;

[0067] The topcoat also includes deionized water.

[0068] The preparation method of the modified sericite comprises: mixing an ethanol solution with a mass fraction of 90%, sericite and ammonia water with a mass fraction of 25% and stirring for 8 minutes, then adding tetraethyl orthosilicate and stirring at a speed of 1000 rpm for 33 minutes to obtain a mixture C, adding perfluorododecyltrichlorosilane and n-hexane to the mixture C after magnetic stirring for 35 minutes and stirring for another 24 hours, drying at a temperature of 83° C., grinding, and passing through a 200-mesh sieve to obtain the modified sericite;

[0069] The dosage ratio of the ethanol solution, sericite, ammonia water, tetraethyl orthosilicate, perfluorododecyltrichlorosilane and n-hexane is 85 mL: 1 g: 4 mL: 0.7 mL: 0.35 g: 22 g.

[0070] A method for preparing an acrylic topcoat for floor, the method comprising the following steps:

[0071] S1. Mix the hydroxy acrylic acid dispersion and deionized water and stir them at a controlled speed of 500 r / min to obtain a mixture A for standby use; mix [8-(epoxypropyloxy)-n-octyl]trimethoxysilane, triethoxymethylsilane and mixture to obtain a mixture A, adjust the pH to 2 with a 10% hydrochloric acid solution, add the mixture A and stir for 3 h, cool to 5° C. in an ice water bath after stirring, add 1-benzyl-2-methylimidazole at a controlled speed of 1150 rmp and stir for 1 h to obtain a mixture B;

[0072] The mass ratio of the hydroxylated acrylic acid dispersion to deionized water is 8:3;

[0073] S2. Add modified sericite, bentonite, glass beads, BYK-371, BYK-P220, BYK-028 and TEGO AddBond DS1300 to mixed material B in sequence and stir evenly at a controlled speed of 900 rpm to obtain component A.

[0074] S3, under a nitrogen environment, mix hexamethylene diisocyanate and propylene glycol diacetate and stir evenly at a controlled speed of 500 rpm, and filter with a 160-mesh silk cloth to obtain component B;

[0075] S4, mixing component A and component B evenly, then adding deionized water and mixing evenly to obtain a finished topcoat product;

[0076] The mass ratio of the A component to deionized water is 1:0.2.

[0077] Example 3

[0078] An acrylic topcoat for floor, the topcoat comprising component A and component B in a mass ratio of 5:1;

[0079] The A component includes the following raw materials in parts by weight:

[0080] 80 parts by weight of hydroxylated acrylic dispersion

[0081]

[0082] The B component includes the following raw materials in parts by weight:

[0083] Hexamethylene diisocyanate 7 parts by weight

[0084] 2 parts by weight of propylene glycol diacetate;

[0085] The composite filler comprises modified sericite, bentonite and glass microspheres in a mass ratio of 2.5:1:3.5;

[0086] The glass microspheres have a wall thickness of 2 μm and a particle size of 200 μm;

[0087] The topcoat also includes deionized water.

[0088] The preparation method of the modified sericite comprises: mixing an ethanol solution with a mass fraction of 90%, sericite and ammonia water with a mass fraction of 20% and stirring for 9 minutes, then adding tetraethyl orthosilicate and stirring at a speed of 1100 rpm for 35 minutes to obtain a mixture C, adding perfluorododecyltrichlorosilane and n-hexane to the mixture C after magnetic stirring for 40 minutes and stirring for another 26 hours, drying at a temperature of 80° C., grinding, and passing through a 200-mesh sieve to obtain the modified sericite;

[0089] Among them, the usage ratio of the ethanol solution, sericite, ammonia water, tetraethyl orthosilicate, perfluorododecyltrichlorosilane and n-hexane is 90mL:1.3g:4.2mL:0.65mL:0.4g:29g.

[0090] A method for preparing an acrylic topcoat for floor, the method comprising the following steps:

[0091] S1. Mix the hydroxy acrylic acid dispersion and deionized water and stir at a controlled speed of 550 r / min to obtain a mixture A for standby use; mix [8-(epoxypropyloxy)-n-octyl]trimethoxysilane, triethoxymethylsilane and 1-benzyl-2-methylimidazole at a controlled speed of 1200 rmp to obtain a mixture B; adjust the pH value to 2.5 with a 10% hydrochloric acid solution, add the mixture A and stir for 2.5 hours; after stirring, cool to 6.5° C. in an ice water bath, add 1-benzyl-2-methylimidazole at a controlled speed of 1200 rmp and stir for 1.5 hours to obtain a mixture B;

[0092] The mass ratio of the hydroxylated acrylic acid dispersion to deionized water is 7:3.5;

[0093] S2. Add modified sericite, bentonite, glass beads, BYK-371, BYK-P220, BYK-028 and TEGO AddBond DS1300 to mixed material B in sequence and stir evenly at a controlled speed of 1000 rpm to obtain component A.

[0094] S3, under a nitrogen environment, hexamethylene diisocyanate and propylene glycol diacetate were mixed and stirred at a controlled speed of 550 rpm, and filtered through a 160-mesh silk cloth to obtain component B;

[0095] S4, mixing component A and component B evenly, then adding deionized water and mixing evenly to obtain a finished topcoat product;

[0096] The mass ratio of the A component to deionized water is 1:0.1.

[0097] Comparative Example 1

[0098] Compared with Example 1, the difference is that no modified sericite is added in Example 1, that is, the composite filler includes bentonite and glass microspheres in a mass ratio of 3:5.5; the other operating steps and parameters remain unchanged.

[0099] Comparative Example 2

[0100] Compared with Example 1, the difference is that in Comparative Example 2, no bentonite is added, that is, the composite filler includes modified sericite and glass microspheres in a mass ratio of 3.8:4.7; the other operating steps and parameters remain unchanged.

[0101] Comparative Example 3

[0102] Compared with Example 1, the difference is that in Comparative Example 3, no glass microspheres are added, that is, the composite filler includes modified sericite and bentonite in a mass ratio of 5:3.5; the other operating steps and parameters remain unchanged.

[0103] Comparative Example 4

[0104] Compared with Example 1, the difference is that in the preparation method of the modified sericite in Comparative Example 4, no perfluorododecyltrichlorosilane is added; the other operating steps and parameters remain unchanged.

[0105] Comparative Example 5

[0106] Compared with Example 1, the difference is that no triethoxymethylsilane is added in Comparative Example 5; the other operating steps and parameters remain unchanged.

[0107] Comparative Example 6

[0108] Compared with Example 1, the difference is that in Comparative Example 6, [8-(epoxypropyloxy)-n-octyl]trimethoxysilane is not added; the other operating steps and parameters remain unchanged.

[0109] Comparative Example 7

[0110] Compared with Example 1, the difference is that in Comparative Example 7, 1-benzyl-2-methylimidazole is not added; the other operating steps and parameters remain unchanged.

[0111] Test Example 1

[0112] According to GB / T 9274-1988, the topcoats prepared in Examples 1-3 and Comparative Examples 1-4 were tested for liquid medium resistance; according to GB / T 5209-1985, the topcoats prepared in Examples 1-3 and Comparative Examples 1-4 were tested for water resistance; the results are shown in Table 1.

[0113] Table 1

[0114]

[0115]

[0116] As can be seen from Table 1, the topcoat prepared by the present invention has excellent chemical resistance.

[0117] Test Example 2

[0118] According to GB / T1768-2006, the wear resistance of the topcoats prepared in Examples 1-3 and Comparative Examples 5-7 was tested; the results are shown in Table 2.

[0119] Table 2

[0120]

[0121] As can be seen from Table 2, the topcoat prepared by the present invention has excellent wear resistance.

[0122] 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.

[0123] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. An acrylic topcoat for floor, characterized in that: The topcoat comprises component A and component B in a mass ratio of 4.5-5:1; The component A comprises 70-80 parts by weight of hydroxy acrylic dispersion, 4.5-4.8 parts by weight of triethoxymethylsilane, 2-2.2 parts by weight of [8-(epoxypropyloxy)-n-octyl]trimethoxysilane, 0.025-0.3 parts by weight of 1-benzyl-2-methylimidazole, 15-20 parts by weight of composite filler, 0.4-0.5 parts by weight of leveling agent, 1-1.5 parts by weight of dispersant, 0.3-0.4 parts by weight of defoamer, and 2-3 parts by weight of adhesion promoter; The B component includes 7-8 parts by weight of a curing agent and 1-2 parts by weight of propylene glycol diacetate; The composite filler comprises modified sericite, bentonite and glass microspheres in a mass ratio of 2-3:1-2:3-4; The preparation method of the modified sericite comprises the following steps: mixing and stirring an ethanol solution, sericite and ammonia water, adding tetraethyl orthosilicate and stirring at a controlled speed to obtain a mixture C, adding perfluorododecyltrichlorosilane and n-hexane to the mixture C after magnetic stirring and stirring again, drying at a controlled temperature, grinding and sieving to obtain the modified sericite.

2. The acrylic topcoat for floor use according to claim 1, characterized in that: The topcoat also includes deionized water.

3. The acrylic topcoat for floor according to claim 2, characterized in that: The leveling agent in component A includes BYK-371; the dispersant includes BYK-P220; the defoamer includes BYK-028; the adhesion promoter includes TEGO AddBond DS1300; and the hydroxyl content of the hydroxylated acrylic dispersion is 4.2%.

4. The acrylic topcoat for floor use according to claim 2, characterized in that: The curing agent in component B includes hexamethylene diisocyanate.

5. The acrylic topcoat for floor according to claim 2, characterized in that: The dosage ratio of the ethanol solution, sericite, ammonia water, tetraethyl orthosilicate, perfluorododecyltrichlorosilane and n-hexane is 85-90 mL: 1-1.5 g: 4-4.2 mL: 0.6-0.7 mL: 0.3-0.4 g: 15-29 g.

6. A method for preparing an acrylic topcoat for floor use as claimed in any one of claims 2 to 5, characterized in that: The preparation method specifically comprises the following steps: S1, mixing the hydroxy acrylic acid dispersion and deionized water and stirring at a controlled speed to obtain a mixture A for standby use; mixing [8-(epoxypropyloxy)-n-octyl]trimethoxysilane and triethoxymethylsilane, adjusting the pH, adding the mixture A and stirring, cooling, and adding 1-benzyl-2-methylimidazole at a controlled speed and stirring to obtain a mixture B; S2, adding composite filler, leveling agent, dispersant, defoamer and adhesion promoter to mixed material B in sequence, controlling the speed and stirring evenly, to obtain component A; S3, mixing the curing agent and propylene glycol diacetate under a nitrogen environment, stirring at a controlled speed, and filtering to obtain component B; S4. Mix component A and component B evenly, then add deionized water and mix evenly to obtain a finished topcoat product.

7. The method for preparing an acrylic topcoat for floor use according to claim 6, characterized in that: The mass ratio of the hydroxylated acrylic acid dispersion to deionized water in step S1 is 7-8:3-4; the mass ratio of component A to deionized water in step S4 is 1:0.1-0.

2.

8. The method for preparing an acrylic topcoat for floor use according to claim 6, characterized in that: The pH value in step S1 is adjusted to 2-3 using a 10% by mass hydrochloric acid solution.

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