Low viscosity epoxy terrazzo coating and method of making

Abstract

The application discloses a low-viscosity epoxy resin grinding stone coating and a preparation method thereof. The coating comprises the following raw materials in parts by weight: 40-67 parts of low-viscosity high-performance epoxy resin, 2-5 parts of active diluent, 0.2-0.6 parts of defoaming agent, 0.2-0.6 parts of leveling agent, 0.3-0.6 parts of dispersing agent, 0.2-0.5 parts of surface control agent, 30.5-51 parts of inorganic functional filler, 2-4 parts of coupling agent and 3-7 parts of color paste; the epoxy resin has an epoxy equivalent of 190-220 g / eq and a viscosity of 1000-1200 mPa.s at 25 DEG C. The low-viscosity epoxy resin grinding stone coating has the advantages of low cost, moderate viscosity and good permeability.

Description

Technical Field

[0001] This application relates to the field of building decoration technology, and in particular to a low-viscosity epoxy resin terrazzo coating. Background Technology

[0002] Epoxy resins have high viscosity, and using high-viscosity epoxy resins can affect the performance and cost of coatings. Firstly, high-viscosity epoxy resins increase the viscosity of the coating, thereby reducing its permeability. Secondly, due to the long molecular chains of epoxy resins, the coating's flowability decreases, making it difficult to fully penetrate the substrate surface, thus affecting the coating's adhesion and performance.

[0003] Furthermore, to adjust the viscosity of the coating, high-viscosity epoxy resins require more solvents or diluents. This increases the amount of solvent or diluent used, leading to higher raw material costs, and necessitates additional processes for viscosity adjustment, increasing production and time costs. Moreover, when using high-viscosity epoxy resins in coatings, the amount of aggregate added during coating and aggregate mixing must be relatively reduced to ensure the coating's flowability. However, reduced aggregate usage results in insufficient hardness and abrasion resistance in the coating film, thus affecting coating quality. Additionally, reduced aggregate addition leads to a relatively higher cost for the coating film. Summary of the Invention

[0004] In order to solve at least one of the above-mentioned technical problems and develop a coating with low cost, moderate viscosity and good penetration, this application provides a low viscosity epoxy resin terrazzo coating.

[0005] In a first aspect, this application provides a low-viscosity epoxy resin terrazzo coating, wherein the coating comprises the following raw materials by weight: 40-67 parts of low-viscosity high-performance epoxy resin, 2-5 parts of reactive diluent, 0.2-0.6 parts of defoamer, 0.2-0.6 parts of leveling agent, 0.3-0.6 parts of dispersant, 0.2-0.5 parts of surface control agent, 30.5-51 parts of inorganic functional filler, 2-4 parts of coupling agent, and 3-7 parts of color paste;

[0006] The low-viscosity epoxy resin has an epoxy equivalent of 190–220 g / eq and a viscosity of 1000–1200 mPa·s at 25°C.

[0007] By adopting the above-described technical solution, the low-viscosity epoxy resin terrazzo coating provided by this application has good permeability and optimal viscosity. In the preparation of the coating, the lower viscosity epoxy resin provides optimal viscosity, thereby not only reducing the high cost impact of high-viscosity epoxy resin, but also improving the coating's permeability to aggregates, thus enhancing the compressive and flexural strength of the coating film.

[0008] Optionally, the coating comprises the following raw materials by weight: 50-67 parts of low-viscosity high-performance epoxy resin, 4-5 parts of reactive diluent, 0.4-0.6 parts of defoamer, 0.4-0.6 parts of leveling agent, 0.4-0.6 parts of dispersant, 0.3-0.5 parts of surface control agent, 38-51 parts of inorganic functional filler, 3-4 parts of coupling agent, and 5-7 parts of color paste.

[0009] Optionally, the weight ratio of the low-viscosity high-performance epoxy resin to the inorganic functional filler is (1.25~1.35):1.

[0010] By adopting the above technical solution, the low-viscosity epoxy resin terrazzo coating prepared in this application can have better permeability, thereby improving its compatibility with aggregates, and providing better compressive strength and flexural strength for the coating film.

[0011] Optionally, the low-viscosity epoxy resin has an epoxy equivalent of 190-200 g / eq and a viscosity of 1000-1100 mPa·s at 25°C.

[0012] Optionally, the low-viscosity epoxy resin is prepared from bisphenol F epoxy resin and n-octylamine in a weight ratio of (97-112):(3-18).

[0013] By adopting the above technical solution, this application uses bisphenol F epoxy resin and n-octylamine to prepare low-viscosity epoxy resin, which can reduce the viscosity of bisphenol F epoxy resin, thereby providing better viscosity and flowability for low-viscosity epoxy resin terrazzo coatings.

[0014] Optionally, the inorganic functional filler includes at least one of diatomaceous earth, porous calcium carbonate microspheres, and silica.

[0015] By adopting the above technical solution, the low-viscosity epoxy resin terrazzo coating prepared in this application has better stability, compressive strength and weather resistance.

[0016] Optionally, the inorganic functional filler is composed of diatomaceous earth, porous calcium carbonate microspheres, and silica, wherein the weight ratio of diatomaceous earth, porous calcium carbonate microspheres, and silica is 1:1:1.

[0017] Secondly, this application provides a method for preparing a low-viscosity epoxy resin terrazzo coating, the method comprising the following steps:

[0018] S1. Disperse the low-viscosity high-performance epoxy resin, and add reactive diluent, defoamer, leveling agent, dispersant and surface control agent in sequence to disperse evenly to obtain the first mixture;

[0019] S2. Add inorganic functional filler and coupling agent to the first mixture and disperse until the fineness is ≤65 microns to obtain the second mixture;

[0020] S3. Add color paste to the second mixture and disperse to obtain a low-viscosity epoxy resin terrazzo coating.

[0021] By adopting the above technical solution, this application can prepare a low-viscosity epoxy resin terrazzo coating with good flowability, viscosity and penetration performance.

[0022] Optionally, the dispersion speed in step S1 is 500-600 r / min, and the dispersion time is 7-10 min;

[0023] The dispersion speed in step S2 is 1500-1800 r / min, and the dispersion time is 30-45 min;

[0024] The dispersion speed in step S3 is 800-900 r / min, and the dispersion time is 10-15 min.

[0025] Optionally, the low-viscosity epoxy resin is prepared as follows: epoxy resin and n-octylamine are mixed and reacted in a reactor at a temperature of 60-80°C for 1-3 hours to obtain the low-viscosity epoxy resin.

[0026] By adopting the above technical solution, this application can improve the dispersibility and flowability of low-viscosity epoxy resin grinding coatings by limiting the dispersion speed and dispersion time of each component, and at the same time improve the compatibility between the raw materials.

[0027] In summary, the present invention has at least one of the following beneficial technical effects:

[0028] 1. The low-viscosity epoxy resin terrazzo coating provided in this application has good permeability and optimal viscosity. In the preparation of the coating, the lower viscosity epoxy resin provides optimal viscosity, thereby not only reducing the higher cost caused by high-viscosity epoxy resin, but also improving the coating's permeability to aggregates, thus enhancing the compressive and flexural strength of the coating film.

[0029] 2. This application uses bisphenol F epoxy resin and n-octylamine to prepare low-viscosity epoxy resin, which can reduce the viscosity of bisphenol F epoxy resin, thereby providing better viscosity and flowability for low-viscosity epoxy resin terrazzo coatings.

[0030] 3. This application enables the preparation of a low-viscosity epoxy resin terrazzo coating with good flowability, viscosity and penetration properties. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the embodiments.

[0032] The manufacturers and models of the raw materials used in the embodiments and comparative examples in this application are as follows; unless otherwise specified, they are conventional raw materials.

[0033] Bisphenol F epoxy resin: equivalent to 170 g / eq.

[0034] Reactive diluent: Guangzhou Shanghe New Material Technology Co., Ltd., Model S-7400, Epoxy Reactive Diluent S-7400.

[0035] Defoamer: BASF A10.

[0036] Leveling agent: Carboxymethyl cellulose; Aladdin, CAS No. 9004-32-4.

[0037] Dispersant: Nanjing Baiju Technology Co., Ltd.; Baiju Technology 440 nonionic organic surfactant.

[0038] Surface control agent: 100% active ingredient content. Model: TEGO GLIDE 410.

[0039] Diatomaceous earth: average particle size is 300μm.

[0040] Porous calcium carbonate microspheres: average particle size is 300 μm.

[0041] Silica: average particle size is 300um.

[0042] Pigment paste: Wenling Caiyuan Pigment Co., Ltd.

[0043] Octylamine: Merck, CAS number 111-86-4.

[0044] Coupling agent: KH550, with an active ingredient content of 98%.

[0045] Curing agent: Shandong Pinshang New Materials Co., Ltd., 593 epoxy curing agent. Specific Implementation

[0047] Example 1

[0048] This embodiment provides a low-viscosity epoxy resin terrazzo coating. The coating comprises the following raw materials by weight: 40 parts of low-viscosity high-performance epoxy resin, 2 parts of reactive diluent, 0.2 parts of defoamer, 0.2 parts of leveling agent, 0.3 parts of dispersant, 0.2 parts of surface control agent, 31 parts of inorganic functional filler, 2 parts of coupling agent, and 3 parts of color paste.

[0049] The low-viscosity epoxy resin has an epoxy equivalent of 220 g / eq and a viscosity of 1200 mPa·s at 25°C.

[0050] The defoamer used in this embodiment is BASF A10.

[0051] The leveling agent used in this embodiment is carboxymethyl cellulose.

[0052] The reactive diluent in this embodiment is epoxy reactive diluent S-7400.

[0053] The inorganic functional filler in this embodiment is diatomaceous earth.

[0054] The coupling agent used in this embodiment is KH550.

[0055] The preparation method of low-viscosity epoxy resin is as follows: bisphenol F epoxy resin and n-octylamine are mixed and reacted in a reactor at 60°C for 3 hours to obtain low-viscosity epoxy resin. The weight ratio of bisphenol F epoxy resin to n-octylamine is 112:3. The viscosity of the low-viscosity epoxy resin in this embodiment is 1200 mPa·s.

[0056] The preparation method of the low-viscosity epoxy resin terrazzo coating in this embodiment includes the following steps:

[0057] S1. Disperse the low-viscosity high-performance epoxy resin, and add reactive diluent, defoamer, leveling agent, dispersant and surface control agent in sequence to disperse evenly to obtain the first mixture;

[0058] S2. Add inorganic functional filler and coupling agent to the first mixture and disperse to a fineness of 65 micrometers to obtain the second mixture;

[0059] S3. Add color paste to the second mixture and disperse to obtain a low-viscosity epoxy resin terrazzo coating.

[0060] The dispersion speed in step S1 is 500 r / min, and the dispersion time is 10 min.

[0061] The dispersion speed in step S2 is 1500 r / min, and the dispersion time is 45 min.

[0062] The dispersion speed in step S3 is 800 r / min, and the dispersion time is 15 min.

[0063] Examples 2-5

[0064] The difference between Examples 2-5 and Example 1 is that the weight proportions of the low-viscosity epoxy resin terrazzo coating are different. The differences are shown in Table 1.

[0065] Table 1 - Differences between Examples 2-5 and Example 1 (see Table 1 for details)

[0066]

[0067]

[0068] Comparative Example 1

[0069] The difference between this comparative example and Example 4 is that this comparative example uses bisphenol F epoxy resin instead of low viscosity high performance epoxy resin.

[0070] Comparative Example 2

[0071] The difference between this comparative example and Example 4 is that in this example, the weight ratio of bisphenol F epoxy resin to n-octylamine is 90:25 when preparing the low-viscosity epoxy resin.

[0072] Comparative Example 3

[0073] The difference between this comparative example and Example 4 is that in this example, the weight ratio of bisphenol F epoxy resin to n-octylamine is 114:1 when preparing the low-viscosity epoxy resin.

[0074] Comparative Example 4

[0075] The difference between this comparative example and Example 4 is that no inorganic functional fillers were added when preparing the low-viscosity epoxy resin terrazzo coating in this example.

[0076] Performance testing

[0077] The testing procedures for low-viscosity, high-performance epoxy resins are as follows:

[0078] Viscosity testing: GB / T 12007.4-1989 "Method for determining the viscosity of epoxy resins".

[0079] The testing requirements for low-viscosity epoxy resin terrazzo coatings are as follows:

[0080] The permeability test of coatings is mainly reflected by the compressive strength and flexural strength of the coating film obtained after mixing the coating and aggregate. If the compressive strength and flexural strength of the coating film are large, it indicates that the coating has strong permeability to the material, thus giving the coating film strong compressive strength and flexural strength.

[0081] Compressive strength testing: Coating samples were prepared by adding aggregate to the low-viscosity epoxy resin terrazzo coatings prepared in Examples 1-5 and Comparative Examples 1-2, respectively. The coating samples were then coated onto a clean substrate (coating thickness of 3 mm). The weight ratio of aggregate to low-viscosity epoxy resin terrazzo coating in the coating samples was 4:1. The compressive strength of the coating samples was tested according to ASTM D695.

[0082] Flexural strength testing: Coating samples were prepared by adding aggregate to the low-viscosity epoxy resin terrazzo coatings prepared in Examples 1-5 and Comparative Examples 1-2, respectively. After coating the samples onto a clean substrate (coating thickness 3 mm), the compressive strength and flexural strength of the coating film were tested. The weight ratio of aggregate to low-viscosity epoxy resin terrazzo coating in the coating samples was 4:1. The flexural strength of the coating film was tested according to GB / T1731-1993.

[0083] Workable time test: Test the gelation time (25℃) required when 100g of coating is mixed with 5g of hardener.

[0084] The experimental test results of Examples 1-5 and Comparative Examples 1-3 are shown in Table 2.

[0085] Table 2 - Summary of Experimental Detection Results of Examples 1-5 and Comparative Examples 1-3

[0086] Test items Viscosity / mPa.s Compressive strength / MPa Flexural strength / MPa gelation time / min Example 1 1200 70.3 10.2 50 Example 2 1196 72.4 11.3 48 Example 3 1193 73.5 13.5 47 Example 4 1188 77.6 16.4 40 Example 5 1190 74.5 14.1 45 Comparative Example 1 2000 47.8 3.7 20 Comparative Example 2 1332 64.6 8.2 70 Comparative Example 3 1238 68.4 8.5 53 Comparative Example 4 1203 47.9 3.2 54

[0087] Results Analysis: The difference between Examples 2-5 and Example 1 is that, in the preparation of low-viscosity epoxy resin terrazzo coatings, the weight ratio of low-viscosity high-performance epoxy resin and inorganic functional filler was the same, but the weight parts of the other components were adjusted. According to the test results in Table 2, the low-viscosity epoxy resin terrazzo coating prepared by Example 4 has better compressive strength and flexural strength, and requires less gelation time.

[0088] The difference between Comparative Example 1 and Example 4 is that bisphenol F epoxy resin was used instead of low-viscosity high-performance epoxy resin in this comparative example. According to the experimental data in Table 2, if epoxy resin without reduced viscosity is used, the aggregate and low-viscosity epoxy resin terrazzo coating will not mix evenly. To ensure complete mixing of the coating and aggregate, the amount of aggregate added needs to be reduced. This will decrease the proportion of coating in the coating sample, which will increase the cost of the coating sample. Furthermore, the reduced proportion of aggregate in the coating sample will result in poorer compressive and flexural strength.

[0089] The difference between Comparative Example 2 and Example 4 is that in this example, the weight ratio of bisphenol F epoxy resin to n-octylamine was 90:25 when preparing the low-viscosity epoxy resin. According to the experimental data in Table 2, when the amount of bisphenol F epoxy resin used in preparing the low-viscosity epoxy resin is low, it leads to a longer gelation time and higher viscosity of the coating. This may be because when the amount of n-octylamine increases, the crosslinking density of the mixture of n-octylamine and bisphenol F epoxy resin increases. The increased crosslinking density leads to an increase in the number of crosslinks in the molecular chains, resulting in a higher molecular weight and viscosity in the liquid system.

[0090] The difference between Comparative Example 3 and Example 4 is that in this example, the weight ratio of bisphenol F epoxy resin to n-octylamine in preparing the low-viscosity epoxy resin is 114:1. According to the experimental results in Table 2, when preparing the low-viscosity epoxy resin, a higher amount of bisphenol F epoxy resin results in poorer compressive and flexural strength of the coating film. This may be because a decrease in the amount of n-octylamine reduces the crosslinking density, leading to insufficient crosslinking structure formation and an inability to effectively reduce the viscosity of the epoxy resin. Therefore, reducing the amount of n-octylamine may affect the viscosity of the liquid system, preventing it from achieving the desired low viscosity.

[0091] The difference between Comparative Example 4 and Example 4 is that no inorganic functional filler was added when preparing the low-viscosity epoxy resin terrazzo coating in this example. According to the experimental test results in Table 2, if no inorganic functional filler is added when preparing the low-viscosity epoxy resin terrazzo coating, the coating film prepared after mixing with the aggregate without the addition of inorganic filler cannot have strong compressive strength and flexural strength. The reason for this may be that the inorganic functional filler used in this application can improve the compatibility between the coating and the aggregate and improve the density of the coating film, thereby giving the coating film strong compressive strength and flexural strength.

[0092] Performance testing

[0093] Examples 6-9

[0094] Example 6

[0095] The difference between this embodiment and embodiment 4 is that, in this embodiment, when preparing the low-viscosity epoxy resin terrazzo coating, the total weight of the low-viscosity high-performance epoxy resin and the inorganic functional filler is 102.6, and the weight ratio of the low-viscosity high-performance epoxy resin to the inorganic functional filler is 1.25:1.

[0096] Example 7

[0097] The difference between this embodiment and embodiment 4 is that, in this embodiment, when preparing the low-viscosity epoxy resin terrazzo coating, the total weight of the low-viscosity high-performance epoxy resin and the inorganic functional filler is 102.6, and the weight ratio of the low-viscosity high-performance epoxy resin to the inorganic functional filler is 1.28:1.

[0098] Example 8

[0099] The difference between this embodiment and embodiment 4 is that, in this embodiment, when preparing the low-viscosity epoxy resin terrazzo coating, the total weight of the low-viscosity high-performance epoxy resin and the inorganic functional filler is 102.6, and the weight ratio of the low-viscosity high-performance epoxy resin to the inorganic functional filler is 1.33:1.

[0100] Example 9

[0101] The difference between this embodiment and embodiment 4 is that, in this embodiment, when preparing the low-viscosity epoxy resin terrazzo coating, the total weight of the low-viscosity high-performance epoxy resin and the inorganic functional filler is 102.6, and the weight ratio of the low-viscosity high-performance epoxy resin to the inorganic functional filler is 1.35:1.

[0102] The experimental test results of Examples 6 to 9 are shown in Table 3.

[0103] Table 3 - Experimental Detection Results of Examples 6 to 9

[0104]

[0105] Results Analysis: The difference between Examples 6-9 and Example 4 lies in the different weight ratios of low-viscosity high-performance epoxy resin and inorganic functional fillers in the preparation of the low-viscosity epoxy resin terrazzo coating. Combined with the test results in Table 3, it can be seen that the low-viscosity epoxy resin terrazzo coating prepared in Example 8 has better compressive and flexural strength. This may be because, in the preparation of the low-viscosity epoxy resin terrazzo coating, the low-viscosity high-performance epoxy resin provides better viscosity, while the inorganic functional filler provides better density and flexural strength.

[0106] Examples 10-13

[0107] Example 10

[0108] The difference between this embodiment and Embodiment 8 is that, in this embodiment, the weight ratio of bisphenol F epoxy resin to n-octylamine is 107:8 when preparing the low-viscosity epoxy resin. The equivalent weight of the low-viscosity epoxy resin in this embodiment is 210.

[0109] Example 11

[0110] The difference between this embodiment and Embodiment 8 is that, in this embodiment, the weight ratio of bisphenol F epoxy resin to n-octylamine is 102:13 when preparing the low-viscosity epoxy resin. The equivalent weight of the low-viscosity epoxy resin in this embodiment is 200.

[0111] Example 12

[0112] The difference between this embodiment and Embodiment 8 is that, in this embodiment, the weight ratio of bisphenol F epoxy resin to n-octylamine is 100:15 when preparing the low-viscosity epoxy resin. The equivalent weight of the low-viscosity epoxy resin in this embodiment is 196.

[0113] Example 13

[0114] The difference between this embodiment and Embodiment 8 is that, in this embodiment, the weight ratio of bisphenol F epoxy resin to n-octylamine is 97:18 when preparing the low-viscosity epoxy resin. The equivalent weight of the low-viscosity epoxy resin in this embodiment is 190.

[0115] The experimental test results of Examples 10-13 are shown in Table 4.

[0116] Table 4 - Experimental Detection Results of Examples 10-13

[0117]

[0118]

[0119] Results Analysis: The difference between Examples 10-13 and Example 8 lies in the different weight ratios of bisphenol F epoxy resin and n-octylamine in preparing the low-viscosity epoxy resin. Combined with the experimental results in Table 4, it can be seen that the low-viscosity epoxy resin grinding coating prepared in Example 12 exhibits better compressive and flexural strength. This indicates that a weight ratio of 100:15 for bisphenol F epoxy resin to n-octylamine in the preparation of the low-viscosity epoxy resin results in a lower viscosity, which improves the compatibility between the low-viscosity epoxy resin grinding coating and the aggregate, thus leading to stronger compressive and flexural strength in the resulting coating sample. Increasing or decreasing the amount of n-octylamine affects the viscosity of the prepared low-viscosity epoxy resin. When the amount of n-octylamine increases, the crosslinking density of the mixture of n-octylamine and bisphenol F epoxy resin also increases. Increased crosslinking density leads to an increase in the number of crosslinks in the molecular chains, resulting in a higher molecular weight and viscosity in the liquid system. However, when the amount of n-octylamine is reduced, the crosslinking density decreases, resulting in insufficient crosslinking structure formation and an inability to effectively reduce the viscosity of the epoxy resin. Therefore, reducing the amount of n-octylamine may affect the viscosity of the liquid system, preventing it from achieving the desired low viscosity.

[0120] Example 14

[0121] The difference between this embodiment and Embodiment 12 is that the filler used in preparing the low-viscosity epoxy resin terrazzo coating is different. In this embodiment, the filler used is porous calcium carbonate microspheres.

[0122] Example 15

[0123] The difference between this embodiment and Embodiment 12 is that the filler used in preparing the low-viscosity epoxy resin terrazzo coating is different; the filler used in this embodiment is silica.

[0124] Example 16

[0125] The difference between this embodiment and embodiment 12 is that the inorganic functional filler used in preparing the low-viscosity epoxy resin terrazzo coating is different. The filler in this embodiment is composed of diatomaceous earth, porous calcium carbonate microspheres, and silica, wherein the weight ratio of diatomaceous earth, porous calcium carbonate microspheres, and silica is 1:1:1.

[0126] The experimental test results of Examples 14-16 are shown in Table 5.

[0127] Table 5 - Experimental Detection Results of Examples 14-16

[0128]

[0129] Results Analysis: The difference between Examples 14-16 and Example 11 lies in the selection of fillers used in the preparation of low-viscosity epoxy resin terrazzo coatings. According to the experimental test results in Table 5, the low-viscosity epoxy resin terrazzo coating prepared in Example 16 has better compressive and flexural strength. This shows that when the inorganic functional filler is a combination of diatomaceous earth, porous calcium carbonate microspheres, and silica, it is beneficial to improve the compressive and flexural strength of the coating sample.

[0130] Example 17

[0131] The difference between this embodiment and embodiment 16 is that in this embodiment, when preparing the low-viscosity epoxy resin terrazzo coating, the dispersion speed in step S1 is 550 r / min and the dispersion time is 8 min.

[0132] In step S2, the dispersion speed is 1600 r / min and the dispersion time is 35 min.

[0133] In step S3, the dispersion speed is 860 r / min and the dispersion time is 13 min.

[0134] Example 18

[0135] The difference between this embodiment and embodiment 16 is that in this embodiment, when preparing the low-viscosity epoxy resin terrazzo coating, the dispersion speed in step S1 is 600 r / min and the dispersion time is 7 min.

[0136] In step S2, the dispersion speed is 1800 r / min and the dispersion time is 30 min.

[0137] In step S3, the dispersion speed is 900 r / min and the dispersion time is 10 min.

[0138] The experimental test results of Examples 17 and 18 are shown in Table 6.

[0139] Table 6 - Experimental Detection Results of Examples 17-18

[0140]

[0141]

[0142] Results Analysis: The difference between Examples 17-18 and Example 16 lies in the selection of inorganic functional fillers used in the preparation of low-viscosity epoxy resin terrazzo coatings. According to the experimental test results in Table 6, the composition of low-viscosity epoxy resin terrazzo coating and aggregate prepared in Example 18 has better compressive strength and flexural strength. Therefore, it can be concluded that the low-viscosity epoxy resin terrazzo coating prepared in Example 18 has better permeability.

[0143] Example 19

[0144] The difference between this embodiment and embodiment 17 is that the preparation method of the low viscosity epoxy resin in this embodiment is as follows: epoxy resin and n-octylamine are mixed and reacted in a reaction vessel at a temperature of 70°C for 2 hours to obtain low viscosity epoxy resin.

[0145] Example 20

[0146] The difference between this embodiment and embodiment 17 is that the preparation method of the low viscosity epoxy resin in this embodiment is as follows: epoxy resin and n-octylamine are mixed and reacted in a reaction vessel at a temperature of 80°C for 1 hour to obtain the low viscosity epoxy resin.

[0147] The experimental test results of Examples 19 and 20 are shown in Table 7.

[0148] Table 7 - Experimental Detection Results of Examples 19-20

[0149]

[0150] Results Analysis: The difference between Examples 19-20 and Example 17 is that the preparation methods of the low-viscosity epoxy resin are different. According to the experimental test results in Table 7, the low-viscosity epoxy resin prepared by Example 19 can effectively reduce the viscosity of the prepared low-viscosity epoxy resin terrazzo coating, thereby improving the permeability of the coating.

[0151] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-viscosity epoxy resin terrazzo coating, characterized in that, The coating is composed of the following raw materials by weight: 40-67 parts of low-viscosity high-performance epoxy resin, 2-5 parts of reactive diluent, 0.2-0.6 parts of defoamer, 0.2-0.6 parts of leveling agent, 0.3-0.6 parts of dispersant, 0.2-0.5 parts of surface control agent, 30.5-51 parts of inorganic functional filler, 2-4 parts of coupling agent, and 3-7 parts of color paste; the low-viscosity high-performance epoxy resin has an epoxy equivalent of 190-220 g / eq and a viscosity of 1000-1200 mPa·s at 25°C; The low-viscosity high-performance epoxy resin is prepared by bisphenol F epoxy resin and n-octylamine in a weight ratio of (97~112):(3~18). The preparation method of the low-viscosity high-performance epoxy resin is as follows: epoxy resin and n-octylamine are mixed and reacted in a reaction vessel at a temperature of 60~80℃ for 1~3 hours to obtain the low-viscosity high-performance epoxy resin. The inorganic functional filler includes at least one of diatomaceous earth, porous calcium carbonate microspheres, and silica.

2. The low-viscosity epoxy resin terrazzo coating according to claim 1, characterized in that, The weight ratio of the low-viscosity high-performance epoxy resin to the inorganic functional filler is 1.33:

1.

3. The low-viscosity epoxy resin terrazzo coating according to claim 1, characterized in that, The weight ratio of bisphenol F epoxy resin to n-octylamine is 100:

15. The epoxy equivalent of the low-viscosity high-performance epoxy resin is 196 g / eq, and the viscosity at 25°C is 1000~1100 mPa·s.

4. The low-viscosity epoxy resin terrazzo coating according to claim 1, characterized in that, The inorganic functional filler is composed of diatomaceous earth, porous calcium carbonate microspheres, and silica, wherein the weight ratio of diatomaceous earth, porous calcium carbonate microspheres, and silica is 1:1:

1.

5. A method for preparing a low-viscosity epoxy resin terrazzo coating according to any one of claims 1 to 4, characterized in that, The preparation method of the coating includes the following steps: S1, dispersing low-viscosity high-performance epoxy resin, and sequentially adding reactive diluent, defoamer, leveling agent, dispersant and surface control agent and dispersing evenly to obtain a first mixture; S2, adding inorganic functional filler and coupling agent to the first mixture and dispersing to a fineness ≤65 micrometers to obtain a second mixture; S3, adding color paste to the second mixture and dispersing to obtain a low-viscosity epoxy resin terrazzo coating.

6. The method for preparing a low-viscosity epoxy resin terrazzo coating according to claim 5, characterized in that, The dispersion speed in step S1 is 500~600 r / min, and the dispersion time is 7~10 min; the dispersion speed in step S2 is 1500~1800 r / min, and the dispersion time is 30~45 min; the dispersion speed in step S3 is 800~900 r / min, and the dispersion time is 10~15 min.

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