Super wear-resistant polyurethane floor coating and preparation method thereof

Abstract

The invention provides a super wear-resistant polyurethane floor coating and a preparation method thereof, the super wear-resistant polyurethane floor coating comprises a component A, a component B and a component C. The component A comprises glycidyl ether compound modified polyisocyanate; the component B comprises a latent imine curing agent, a diluent, a functional auxiliary agent and a pigment filler; the component C comprises aggregate; the mass ratio of the component A to the component B to the component C is (4-6): (2-4): (1-3). By optimizing and modifying the components in the super wear-resistant polyurethane coating, the properties such as high hardness, excellent wear resistance and the like of the super wear-resistant polyurethane finish paint are maintained; the interlayer adhesive force between the super-wear-resistant polyurethane floor finish paint material and various epoxy floating coatings can be obviously improved, and the construction matching property in a high-humidity environment and the wear resistance of a whole floor coating system are improved.

Description

Technical Field

[0001] This invention belongs to the field of floor coating technology, specifically relating to an ultra-wear-resistant polyurethane floor coating and its preparation method. Background Technology

[0002] Ultra-wear-resistant polyurethane floor coatings are widely used in indoor flooring systems of various industrial and civil buildings. The cured coating film has high hardness, good scratch resistance, good wear resistance, and fast curing speed. It is often used in combination with various epoxy or polyurethane flooring materials to form ultra-wear-resistant floor coating systems. It can be used for various indoor flooring applications, such as indoor parking garage flooring systems and factory workshop flooring systems.

[0003] Commonly used ultra-wear-resistant polyurethane floor coatings are multi-component, moisture-curing, high-solids polyurethane floor coatings. Their most common application is as a topcoat for various epoxy flooring intermediates. However, the following quality defects frequently occur during their application:

[0004] (1) Existing ultra-wear-resistant polyurethane topcoats have low applicability on different epoxy flooring materials. Different types of organic amine curing agents are used in epoxy flooring materials, resulting in inconsistent interlayer adhesion of ultra-wear-resistant polyurethane topcoats on different epoxy flooring layers. The interlayer adhesion is acceptable on some commonly used epoxy flooring layers, but poor on others, thus affecting the overall wear resistance of the flooring system.

[0005] (2) The performance is unstable in low temperature and high humidity construction environment. Due to the characteristics of different organic amine curing agents used in epoxy floor coatings, the surface of the epoxy coating after curing is prone to moisture absorption in low temperature and high humidity construction environment, resulting in the formation of different degrees of ammonium carbonate salts. This affects the interlayer adhesion of the coating film after the application of ultra-wear-resistant polyurethane topcoat on the epoxy coating, as well as the wear resistance and other properties of the floor system.

[0006] (3) Since common ultra-wear-resistant polyurethane topcoats are moisture-curing polyurethane coatings, in order not to affect their moisture-curing performance, the application rate of a single coat is usually no more than 0.1 kg / m², and the dry film thickness is no more than 60 micrometers. The thicker the dry film of the ultra-wear-resistant polyurethane topcoat, the better the wear resistance of the overall coating system. However, the paint film usually contains anti-slip and wear-resistant aggregates, resulting in a rough textured surface. This makes it impossible to increase the thickness of the ultra-wear-resistant polyurethane topcoat film in the ultra-wear-resistant flooring system through multiple coats, thus restricting the improvement of the overall flooring system's wear resistance.

[0007] Therefore, in order to improve the applicability of ultra-wear-resistant polyurethane floor coatings on different epoxy flooring materials and enhance the wear resistance of the overall flooring system, especially its wear resistance in low-temperature and high-humidity construction environments, it is necessary to develop a new type of ultra-wear-resistant polyurethane floor coating. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, this invention provides an ultra-wear-resistant polyurethane floor coating and its preparation method. By optimizing and modifying the components in the ultra-wear-resistant polyurethane coating, this invention can significantly improve the interlayer adhesion between the ultra-wear-resistant polyurethane floor coating material and various epoxy intermediate coatings, improve the construction compatibility in high humidity environments, and enhance the wear resistance of the overall floor coating system while maintaining the high hardness and excellent wear resistance of the ultra-wear-resistant polyurethane topcoat.

[0009] The technical solution provided by this invention is as follows:

[0010] A super wear-resistant polyurethane floor coating includes component A, component B, and component C, wherein:

[0011] Component A includes a polyisocyanate modified with glycidyl ether compounds;

[0012] Component B includes latent imine curing agent, diluent, functional additives, pigments and fillers;

[0013] Component C includes aggregate.

[0014] The present invention is further configured such that the mass ratio of component A, component B and component C is (4-6):(2-4):(1-3), preferably 5:3:2.

[0015] The present invention is further configured such that the glycidyl ether compound in component A is selected from butyl monoepoxy glycidyl ether and C12-14 alkyl glycidyl ether, preferably butyl monoepoxy glycidyl ether.

[0016] The present invention is further configured such that component A comprises: a glycidyl ether-modified polyisocyanate and a polyisocyanate, wherein the weight parts of each component are:

[0017] 35-45 parts of glycidyl ether-modified polyisocyanate;

[0018] 55-65 parts of polyisocyanate.

[0019] Preferably, 38-42 parts of a polyisocyanate modified with glycidyl ether compounds;

[0020] 58-62 parts of polyisocyanate.

[0021] More preferably, 40 parts of a polyisocyanate modified with glycidyl ether compounds;

[0022] 60 parts of polyisocyanate.

[0023] The present invention is further configured such that the weight fractions of each component in component B are:

[0024] The latent imine curing agent is 10-40 parts, preferably 20-30 parts, and more preferably 25 parts;

[0025] 35-45 parts diluent;

[0026] Functional additives: 1.5–4 parts;

[0027] 25-40 parts of pigments and fillers.

[0028] Furthermore, the weight parts of each component in the functional additives are as follows:

[0029] Dispersant 0.3–0.8 parts;

[0030] Defoamer 0.4-0.6 parts;

[0031] Leveling agent 0.5 to 1 part;

[0032] Catalyst 0.4–0.8 parts;

[0033] The weight percentages of each component in the pigments and fillers are as follows:

[0034] 15-20 parts pigment;

[0035] 13-16 parts of filler.

[0036] The present invention is further configured such that, in component C, the aggregate comprises 220-mesh white corundum, 260-mesh white corundum, and 280-mesh white corundum, and the weight proportions of each component are as follows:

[0037] 20-30 parts of 220-mesh white corundum;

[0038] 30-40 parts of 260-mesh white corundum;

[0039] 35-45 parts of 280 mesh white corundum.

[0040] The present invention is further configured such that the polyisocyanate in component A is obtained by polymerizing an aliphatic diisocyanate monomer, wherein the aliphatic diisocyanate monomer is selected from one or more of tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, and lysine diisocyanate, preferably hexamethylene diisocyanate;

[0041] The polyisocyanate is preferably a trimer of hexamethylene diisocyanate.

[0042] The present invention further specifies that the latent imine curing agent in component B is an aliphatic imine with an amine equivalent of 135-145, preferably 140; a viscosity of 60-80 cps; and a mass percentage of the latent imine curing agent in component B of 20%-30%. Furthermore, the latent imine curing agent comprises the components shown in Formula 1:

[0043]

[0044] The present invention further specifies that the preparation method of the polyisocyanate modified with glycidyl ether compounds in component A includes:

[0045] S1. A modifier is prepared by pre-reacting glycidyl ether with a secondary amine according to a molar ratio of epoxy group to secondary amine group of (1.3-1.6):1;

[0046] S2. Add the modifier prepared in S1 to the polyisocyanate and react to obtain a polyisocyanate modified with glycidyl ether compounds.

[0047] Another aspect of the present invention is to provide a method for preparing an ultra-wear-resistant polyurethane floor coating, comprising the following steps:

[0048] (1) Mix and disperse the specified amount of glycidyl ether-modified polyisocyanate and polyisocyanate evenly as component A;

[0049] (2) Mix and disperse the specified amounts of diluent, functional additives, pigments and fillers, and latent imine curing agent evenly as component B;

[0050] (3) Mix the specified amount of white corundum of different mesh sizes evenly to form component C;

[0051] (4) When ready for use, mix components A, B and C in a mass ratio of (4-6):(2-4):(1-3) and stir evenly before application.

[0052] Steps (1), (2), and (3) are not in any particular order.

[0053] Compared with the prior art, the beneficial effects of the present invention are:

[0054] The ultra-wear-resistant polyurethane floor coating of the present invention, through optimization of components and modification of isocyanate curing agents with glycidyl ether compounds, maintains or even improves the high hardness and excellent wear resistance of ultra-wear-resistant polyurethane topcoat, while significantly improving the interlayer adhesion between ultra-wear-resistant polyurethane floor coating materials and various epoxy intermediate coatings, and improving the construction compatibility in high humidity environments.

[0055] The ultra-abrasion-resistant polyurethane floor coating of the present invention can increase the maximum wet film thickness of a single coat of ultra-abrasion-resistant polyurethane topcoat, achieve a thicker dry film thickness of ultra-abrasion-resistant polyurethane topcoat, and improve the abrasion resistance of the overall floor coating system; it is suitable for various different floor application fields. Detailed Implementation

[0056] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0057] All raw materials used in this invention can be purchased through conventional commercial channels.

[0058] The ultra-wear-resistant polyurethane floor coating of the present invention comprises component A, component B, and component C, wherein:

[0059] Component A includes polyisocyanates modified with glycidyl ether compounds and polyisocyanates not modified with glycidyl ether compounds;

[0060] Component B includes latent imine curing agents, diluents, dispersants, defoamers, leveling agents, catalysts, pigments, and fillers;

[0061] Component C includes 220-mesh white corundum, 260-mesh white corundum, and 280-mesh white corundum.

[0062] The preparation method of the ultra-wear-resistant polyurethane floor coating of the present invention includes the following steps: preparation of component A, preparation of component B, preparation of component C, and mixing of components A, B, and C.

[0063] (1) The preparation of component A includes the following steps:

[0064] Glycidyl ether modified HDI trimer and unmodified HDI trimer were sequentially added to a vacuum mixing tank. The equipment was controlled at a low stirring speed of 300-500 r / min and mixed for 20-40 min to ensure uniform mixing. After mixing, nitrogen gas was purged and metered for packaging to obtain component A of the ultra-wear-resistant polyurethane floor coating.

[0065] (2) The preparation of component B includes the following steps:

[0066] In a vacuum mixing tank, propylene glycol methyl ether acetate (PPE), dispersant, defoamer, and titanium dioxide pigment are added sequentially. The equipment is controlled at high speed (800–1000 rpm). The particles are dispersed and ground to a fineness of less than 40 micrometers using a scraper fineness gauge. Leveling agent and silica powder filler are then added, and the equipment is controlled at high speed (800–1000 rpm) for 20–40 minutes of high-speed dispersion. Finally, latent imide curing agent N1 and dibutyltin dilaurate catalyst are added, and the equipment is controlled at medium-low speed (500–600 rpm) for 3–10 minutes of mixing to ensure uniform mixing. Nitrogen gas is then used for metering and packaging to obtain component B of the ultra-wear-resistant polyurethane floor coating.

[0067] (3) The preparation of component C includes the following steps:

[0068] 220 mesh, 260 mesh, and 280 mesh white corundum were sequentially added to a mortar mixer and mixed for 20–40 minutes. The mixture was then metered and packaged to obtain component C of the ultra-wear-resistant polyurethane floor coating.

[0069] (4) When ready for use, mix components A, B and C in a mass ratio of (4-6): (2-4): (1-3) and stir evenly before application.

[0070] In the above steps (1), (2), and (3), there is no distinction in the order of steps.

[0071] The preparation method of the glycidyl ether modified HDI trimer in component A includes the following steps:

[0072] S1. Preparation of modifier by pre-reaction of glycidyl ether with secondary amine:

[0073] According to the molar ratio of epoxy group to secondary amine group of (1.3-1.6):1, the secondary amine is added to the reaction vessel and the reaction solution is cooled to 0-5°C with a water ice bath; glycidyl ether is slowly added dropwise, and the reaction temperature is controlled to be <30°C during the dropwise addition; after the dropwise addition is completed, the ice bath is removed, the temperature is slowly raised to 50-60°C, and the reaction is continued for 4-6 hours until the secondary amine is completely reacted. Vacuum distillation is performed to distill off and recover the unreacted glycidyl ether. After cooling, the hydroxyl-containing modifier is obtained and ready for use.

[0074] Modification of S2.HDI trimer:

[0075] HDI trimer was added to the reactor, nitrogen protection was activated, and the temperature was raised to 50–60°C. The hydroxyl-containing modifier obtained from reaction S1 was slowly added dropwise to the HDI trimer, controlling the dropping rate and maintaining the reaction temperature at 60–70°C. After the addition was complete, the reaction was continued at this temperature, and samples were taken periodically to titrate the NCO content using the di-n-butylamine method. The reaction was stopped when the measured NCO content reached 17.5%. The temperature was lowered to below 40°C, and the product was discharged to obtain a mixture of modified HDI trimer polyisocyanates.

[0076] The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0077] Example 1

[0078] An ultra-wear-resistant polyurethane floor coating comprises component A, component B, and component C, wherein the mass ratio of component A, component B, and component C is 5:3:2.

[0079] Component A, by mass parts, includes:

[0080] 40 parts of modified HDI trimer

[0081] 60 parts of HDI trimer (Wanhua Chemical, HT-100);

[0082] Component B, by mass parts, includes:

[0083] Dispersant (Byk 163, German chemical company) 0.5 parts,

[0084] Defoamer (Hemings Deqian, De6800) 0.5 parts,

[0085] Leveling agent (Afcona 3777 polymer) 0.8 parts,

[0086] 25 parts of latent imine curing agent (aliphatic imine N1)

[0087] Catalyst (dibutyltin dilaurate) 0.5 parts,

[0088] Diluent (propylene glycol methyl ether acetate, PMA) 40 parts

[0089] Pigment (DuPont, Titanium Dioxide 902) 18 parts

[0090] 15 parts of filler (Sibico, USA, 800 mesh silica powder);

[0091] Component C, by mass parts, includes:

[0092] 25 parts of 220 mesh white corundum

[0093] 35 parts of 260-mesh white corundum

[0094] 40 parts of 280 mesh white corundum.

[0095] The preparation method of the modified HDI trimer in component A includes:

[0096] S1. Preparation of modifier by pre-reaction of glycidyl ether with secondary amine:

[0097] According to the molar ratio of epoxy group to secondary amine group of 1.5:1, 43.15 g of diethylamine was added to the reaction vessel, and the reaction solution was cooled to 0-5°C in a water ice bath. 115.22 g of butyl monoepoxy glycidyl ether (BGE) was slowly added dropwise over 1-2 hours, and the reaction temperature was controlled at 20-25°C during the dropwise addition. After the dropwise addition was completed, the ice bath was removed, the temperature was slowly raised to 55°C, and the reaction was continued for 5 hours until the diethylamine was completely reacted. The reaction was then carried out by vacuum distillation to distill off and recover the unreacted BGE. After cooling, a hydroxyl-containing modifier was obtained. This product is a mixture with N,N-diethyl-3-butoxy-2-hydroxypropylamine ((C2H5)2N-CH2-CH(OH)-CH2-O-C4H9) as the main component, which is ready for use.

[0098] Modification of S2.HDI trimer:

[0099] HDI trimer (Wanhua Chemical, HT-100) was added to the reactor, nitrogen protection was activated, and the temperature was raised to 55°C. The hydroxyl-containing modifier obtained from reaction S1 was slowly added dropwise to the HDI trimer, controlling the dropping rate and maintaining the reaction temperature at 60–70°C. After the addition was complete, the reaction was continued at this temperature, and samples were taken periodically to titrate the NCO content using the di-n-butylamine method. The reaction was stopped when the measured NCO content reached 17.5%. The temperature was lowered to below 40°C, and the product was discharged to obtain a modified HDI trimer polyisocyanate mixture.

[0100] Among them, the latent aliphatic imine curing agent N1 in component B has an amine equivalent of 140 and a viscosity of 60-80 cps. Its main components are those shown in Formula 1.

[0101]

[0102] The preparation method of the above-mentioned ultra-wear-resistant polyurethane floor coating includes the following steps: preparation of component A, preparation of component B, preparation of component C, and mixing of components A, B, and C.

[0103] (1) Preparation of component A:

[0104] Modified HDI trimer and HDI trimer were sequentially added to a vacuum mixing tank. The equipment was controlled at a low stirring speed of 400±25 r / min, and the mixture was stirred for 30 minutes to ensure uniform mixing. After mixing, nitrogen gas was purged, metered, and packaged to obtain component A of the ultra-wear-resistant polyurethane floor coating. The modified HDI trimer and HDI trimer were denoted as H1 and H2, respectively, with a mass ratio of H1 to H2 of 40:60.

[0105] (2) Preparation of component B:

[0106] Diluent, dispersant, defoamer, and pigment were sequentially added to a vacuum mixing tank. The equipment was operated at high speed (900±25 r / min), and the particles were dispersed and ground to a fineness of less than 40 micrometers using a scraper fineness gauge. Leveling agent and filler were then added, and the equipment was operated at high speed (900±25 r / min) for 30 minutes of high-speed dispersion. Finally, latent imide curing agent N1 and catalyst were added, and the equipment was operated at medium-low speed (550±25 r / min) for 5 minutes of mixing to ensure uniform mixing. The mixture was then metered and packaged with nitrogen to obtain component B of the ultra-wear-resistant polyurethane floor coating. The latent imide curing agent comprised 25% by mass.

[0107] (3) Preparation of component C:

[0108] 220-mesh, 260-mesh, and 280-mesh white corundum were sequentially added to a mortar mixer and mixed for 30 minutes. The mixture was then metered and packaged to obtain component C of the ultra-wear-resistant polyurethane floor coating.

[0109] (4) When ready for use, mix components A, B and C in a mass ratio of 5:3:2 and stir evenly before application.

[0110] Example 2

[0111] Similar to Example 1, the selection of each component, the ratio between components, and the preparation method remain unchanged, except that:

[0112] Component A, by mass parts, includes:

[0113] 45 parts of modified HDI trimer

[0114] 55 parts of HDI trimer;

[0115] Component B, by mass parts, includes:

[0116] 0.5 parts dispersant

[0117] 0.5 parts of defoamer

[0118] 0.8 parts leveling agent

[0119] 20 parts of latent imine curing agent

[0120] 0.5 parts catalyst

[0121] 42 parts of diluent

[0122] 20 parts pigment

[0123] 16 parts of packing material.

[0124] All other conditions remained the same as in Example 1. In this example, the mass ratio of H1 to H2 in component A was 45:55; and the mass content of the latent imine curing agent in component B was 20%.

[0125] Example 3

[0126] Similar to Example 1, the selection of each component, the ratio between components, and the preparation method remain unchanged, except that:

[0127] Component A, by mass parts, includes:

[0128] 35 parts of modified HDI trimer

[0129] 65 parts of HDI trimer;

[0130] Component B, by mass parts, includes:

[0131] 0.5 parts dispersant

[0132] 0.5 parts of defoamer

[0133] 0.8 parts leveling agent

[0134] 30 parts of latent imine curing agent

[0135] 0.5 parts catalyst

[0136] 36 parts of diluent

[0137] 18 parts pigment

[0138] 14 parts of filler.

[0139] All other conditions remained the same as in Example 1. In this example, the mass ratio of H1 to H2 in component A was 35:65; and the mass content of the latent imine curing agent in component B was 30%.

[0140] Comparative Example 1

[0141] Same as Example 1, except that: no latent imine curing agent is added to component B, the mass fraction of diluent is 65 parts, and other conditions are consistent with Example 1.

[0142] In this comparative example, the mass ratio of H1 to H2 in component A is 40:60; the mass content of the latent imine curing agent in component B is 0%.

[0143] Comparative Example 2

[0144] Similar to Example 1, except that the mass fraction of the latent imine curing agent in component B is 10 parts and the mass fraction of the diluent is 55 parts, while other conditions remain the same as in Example 1.

[0145] In this comparative example, the mass ratio of H1 to H2 in component A is 40:60; the mass content of the latent imine curing agent in component B is 10%.

[0146] Comparative Example 3

[0147] Similar to Example 1, except that the mass fraction of the latent imine curing agent in component B is 40 parts and the mass fraction of the diluent is 25 parts, while other conditions remain the same as in Example 1.

[0148] In this comparative example, the mass ratio of H1 to H2 in component A is 40:60; the mass content of the latent imine curing agent in component B is 40%.

[0149] Comparative Example 4

[0150] Same as Example 1, except that: Component A, by mass parts, includes:

[0151] 50 parts of modified HDI trimer

[0152] 50 parts of HDI trimer;

[0153] All other conditions remained the same as in Example 1. In this comparative example, the mass ratio of H1 to H2 in component A was 50:50; and the mass content of the latent imine curing agent in component B was 25%.

[0154] Comparative Example 5

[0155] Same as Example 1, except that: Component A, by mass parts, includes:

[0156] 80 parts of modified HDI trimer

[0157] 20 parts of HDI trimer;

[0158] All other conditions remained the same as in Example 1. In this comparative example, the mass ratio of H1 to H2 in component A was 80:20; and the mass content of the latent imine curing agent in component B was 25%.

[0159] Comparative Example 6

[0160] Same as Example 1, except that: Component A, by mass parts, includes:

[0161] 20 parts of modified HDI trimer

[0162] 80 parts of HDI trimer;

[0163] All other conditions remained the same as in Example 1. In this comparative example, the mass ratio of H1 to H2 in component A was 20:80; and the mass content of the latent imine curing agent in component B was 25%.

[0164] Comparative Example 7

[0165] Same as Example 1, except that: Component A, by mass parts, includes:

[0166] 100 parts of modified HDI trimer, without the addition of HDI trimer.

[0167] No latent imine curing agent was added to component B, the mass fraction of the diluent was 65 parts, and all other conditions were the same as in Example 1.

[0168] In this comparative example, the mass ratio of H1 to H2 in component A is 100:0; the mass content of the latent imine curing agent in component B is 0%.

[0169] Comparative Example 8

[0170] Same as Example 1, except that: Component A, by mass parts, includes:

[0171] 100 parts of modified HDI trimer were used, without the addition of HDI trimer. All other conditions remained the same as in Example 1.

[0172] In this comparative example, the mass ratio of H1 to H2 in component A is 100:0; the mass content of the latent imine curing agent in component B is 25%.

[0173] Comparative Example 9

[0174] Same as Example 1, except that: Component A, by mass parts, includes:

[0175] 100 parts of HDI trimer, without added modified HDI trimer.

[0176] No latent imine curing agent was added to component B, the mass fraction of the diluent was 65 parts, and all other conditions were the same as in Example 1.

[0177] In this comparative example, the mass ratio of H1 to H2 in component A is 0:100; the mass content of the latent imine curing agent in component B is 0%.

[0178] Comparative Example 10

[0179] Same as Example 1, except that: Component A, by mass parts, includes:

[0180] 100 parts of HDI trimer, without the addition of modified HDI trimer. All other conditions were kept the same as in Example 1.

[0181] In this comparative example, the mass ratio of H1 to H2 in component A is 0:100; the mass content of the latent imine curing agent in component B is 25%.

[0182] Test case

[0183] Performance testing of ultra-abrasion resistant topcoat

[0184] Abrasion resistance is an important indicator for evaluating ultra-abrasion-resistant polyurethane topcoats. Furthermore, the dry film thickness of ultra-abrasion-resistant topcoats generally does not exceed 150 micrometers, making pencil hardness a suitable criterion for evaluating the strength of such films. Considering that ultra-abrasion-resistant polyurethane topcoats can only be applied in one coat, the performance of the topcoat at higher coverage and thicker single coats is also an important indicator for evaluating its properties. Therefore, the pencil hardness and abrasion resistance of single coats of the ultra-abrasion-resistant polyurethane topcoats in the above examples and comparative examples were tested at different coverage amounts. Curing tests were conducted at standard room temperature (25℃, 50% RH) according to GB / T22374-2018.

[0185] Because the construction environment for floor coatings undergoes changes throughout the four seasons, with significant variations in temperature and humidity, different curing conditions were also employed in tests with varying coating amounts: the pencil hardness and abrasion resistance of the ultra-abrasion-resistant polyurethane topcoat were tested under a low-temperature, high-humidity environment (15℃, 80% RH). The data results are shown in the table below.

[0186]

[0187]

[0188] The data in the table above shows that, at various topcoat application rates, the hardness and abrasion resistance of topcoats cured under low temperature and high humidity conditions are inferior to or equivalent to those of topcoats cured under standard room temperature conditions. Furthermore, as the application rate and thickness increase, the hardness and abrasion resistance of the topcoat also tend to decrease.

[0189] The addition of an appropriate amount of latent imine curing agent to component B helps improve the hardness and abrasion resistance of the topcoat. This is especially true for topcoats cured under low-temperature, high-humidity conditions, and those cured with higher coating weights, where the improvement in hardness and abrasion resistance is more significant. It can significantly narrow the gap in hardness and abrasion resistance between topcoats cured under low-temperature, high-humidity conditions and those cured at standard room temperature, as well as the gap in hardness and abrasion resistance between topcoats cured with high coating weights and those cured with low coating weights. However, excessive addition of latent imine curing agent may lead to a significant decrease in the hardness of the topcoat.

[0190] The modification of the glycidyl ether compounds of HDI trimer in component A will cause a slight decrease in the abrasion resistance of the topcoat; however, the combination of modified HDI trimer (H1) and unmodified HDI trimer (H2) in component A within a specific ratio range can maintain a high level of abrasion resistance of the topcoat.

[0191] In addition, the gloss of the paint film is also one of the evaluation indicators of the film-forming effect. However, considering that the addition of component C aggregate will cause diffuse reflection on the paint film surface, reducing the gloss, and it is not easy to obtain a uniform gloss on the test surface of the coating film, the components A and B of the ultra-wear-resistant polyurethane topcoat were mixed evenly according to the ratios of the examples and comparative examples. Different application amounts (excluding the proportion of component C in the application amount) were cured at a standard room temperature environment (25℃, 50% RH) to prepare coatings of different dry film thicknesses, which were used to evaluate the film-forming effect of different film-forming substance combinations at different thicknesses. The gloss of the paint film at a 60° incident angle was tested according to GB / T9754-2007 standard. The experimental data are as follows.

[0192]

[0193]

[0194] According to the data in the table above, the addition of an appropriate amount of latent imine curing agent in component B helps to improve the gloss of the paint film and enhance the film-forming effect; and the modification of the glycidyl ether compound of HDI trimer in component A also helps to improve the gloss of the paint film and enhance the film-forming effect.

[0195] Intercoating adhesion test

[0196] Interlayer adhesion refers to the ability of different coating layers in a coating system to adhere to each other, and is an important indicator of the overall performance and service life of the coating. The ultra-abrasion-resistant polyurethane topcoat of the ultra-abrasion-resistant polyurethane flooring system, as the most important topcoat (or clear coat) in the entire system, is a crucial source of the coating system's performance, and its interlayer adhesion with the preceding coating is paramount.

[0197] Currently, a common system for floor coatings is to combine epoxy floor intermediate or topcoat with an ultra-abrasion-resistant polyurethane topcoat, forming what is commonly known in the industry as an "ultra-abrasion-resistant polyurethane flooring system." This system typically uses the following epoxy floor coatings as the top coat for the ultra-abrasion-resistant polyurethane topcoat: epoxy floor intermediate with modified aromatic amines as curing agents; epoxy floor intermediate with modified alicyclic amines as curing agents; and epoxy floor intermediate with modified polyether amines as curing agents. The ultra-abrasion-resistant polyurethane topcoat is usually applied within 24-48 hours after the epoxy floor coating has cured. Due to the differences in the performance characteristics of different curing agents, the interlayer adhesion between them and the ultra-abrasion-resistant polyurethane varies significantly. Especially in low-temperature and high-humidity environments, the early curing of the epoxy floor coating is prone to poor, which greatly affects the interlayer adhesion of the subsequently applied ultra-abrasion-resistant polyurethane topcoat.

[0198] The following epoxy coatings cured with different types of organic amine curing agents are used as intermediate coats: epoxy floor intermediate coat 1 (cured with modified aromatic amine as curing agent) uses Suzhou Hengster Industrial Co., Ltd.'s 113 curing agent as curing agent; epoxy floor intermediate coat 2 (cured with modified alicyclic amine as curing agent) uses Air Chemical's ANCAMINE 2883 curing agent as curing agent; and epoxy floor intermediate coat 3 (cured with modified polyether amine as curing agent) uses Suzhou Hengster Industrial Co., Ltd.'s C20 curing agent as curing agent.

[0199] For all the above epoxy intermediate coatings, component A of the solvent-free epoxy intermediate coating RT6021 from Shanghai Canda Building Materials Technology Co., Ltd. was mixed with the aforementioned different organic amine curing agents. The mixing ratio was calculated based on a 1:1 molar ratio of epoxy groups to active hydrogen. After application, the coatings were cured for 24 hours under two different temperature and humidity conditions, and then cured at a rate of 0.1 kg / m². 2 The coating amount was determined by applying an ultra-abrasion-resistant polyurethane topcoat over the existing coating layer, and the interlayer adhesion was tested. The cross-cut adhesion test was used for evaluation, based on ISO 2409:2020-2mm, with a 2mm interval between the cross-cuts. The results were graded from 0 to 5, with 0 indicating the strongest adhesion and 5 indicating the weakest. Two different curing conditions were used: standard room temperature (25℃, 50% RH) and low-temperature, high-humidity (15℃, 80% RH). The experimental data are as follows.

[0200]

[0201]

[0202] According to the data in the table above, the modification of the glycidyl ether compounds of HDI trimer in component A helps to significantly improve the interlayer adhesion between ultra-wear-resistant polyurethane topcoat and different types of epoxy intermediate coats; especially to improve the interlayer adhesion between topcoat cured in low temperature and high humidity environment and epoxy intermediate coat; it can significantly reduce the gap between the interlayer adhesion between topcoat cured in low temperature and high humidity environment and epoxy intermediate coat and the interlayer adhesion performance of topcoat cured in standard room temperature environment.

[0203] By modifying HDI trimer with glycidyl ether compounds, the interlayer adhesion between the topcoat and each epoxy intermediate coat cured under low temperature and high humidity conditions can be improved from grade 3-5 to grade 0-1. Furthermore, the combination of modified HDI trimer (H1) and unmodified HDI trimer (H2) in specific ratios can maintain a high level of interlayer adhesion between the topcoat and each epoxy intermediate coat.

[0204] Abrasion resistance test of ultra-abrasion resistant flooring system

[0205] In the coating structure of ultra-wear-resistant polyurethane flooring systems, the wear resistance and interlayer adhesion of the ultra-wear-resistant polyurethane topcoat are important factors affecting the overall durability and service life of the flooring system.

[0206] In this test example, the abrasion resistance of the following different flooring systems was tested according to the GB / T 1768-2006 test method. A CS-17 grinding wheel was used, and the mass loss (unit: grams) of the test sample after 30,000 revolutions with a 1000-gram load was recorded. For each test, samples were prepared under two different curing conditions for abrasion resistance testing: standard room temperature environment (25℃, 50%RH) and low temperature and high humidity environment (15℃, 80%RH), with a curing time of 168 hours.

[0207] Unlike the abrasion resistance test of the ultra-abrasion-resistant topcoat mentioned earlier, this test example uses a sample of an overall floor coating system with the ultra-abrasion-resistant topcoat applied to an epoxy intermediate layer, forming a dry film thickness of approximately 2mm. Furthermore, considering that conventional product standards typically evaluate the abrasion resistance of a topcoat by measuring the weight loss after 500 revolutions under a 750g compressive force, this only assesses the performance of a single topcoat and cannot represent the abrasion resistance of the entire coating system in real-world applications. Therefore, this test example uses the mass loss after 30,000 revolutions under a 1000g compressive force to evaluate the abrasion resistance of the entire coating system, which more closely reflects the actual evaluation results under real-world usage conditions.

[0208] The test flooring systems are as follows:

[0209] According to 0.1Kg / m 2A 2mm floor coating system was prepared by combining an ultra-wear-resistant polyurethane topcoat with an epoxy intermediate coating (epoxy intermediate coating 1) with modified aromatic amine 113 as the curing agent.

[0210] According to 0.1Kg / m 2 A 2mm floor coating system was prepared by combining an ultra-wear-resistant polyurethane topcoat with an epoxy intermediate coating (epoxy intermediate coating 2) using modified alicyclic amine ANCAMINE 2883 as the curing agent.

[0211] According to 0.1Kg / m 2 0.15Kg / m 2 0.2Kg / m 2 A 2mm floor coating system was prepared by combining an ultra-wear-resistant polyurethane topcoat with an epoxy intermediate coating (epoxy intermediate coating 3) with modified polyetheramine C20 as the curing agent.

[0212] The epoxy intermediate coating used above is the A component of the solvent-free epoxy intermediate coating RT6021 from Shanghai Canda Building Materials Technology Co., Ltd., mixed with different organic amine curing agents. The mixing ratio was calculated based on a 1:1 molar ratio of epoxy groups to active hydrogen. The solvent-free epoxy intermediate coating is applied in one coat to form a 2000-micron wet film. After curing for 24 hours, the ultra-wear-resistant polyurethane topcoat is applied.

[0213] The experimental test data are as follows.

[0214]

[0215]

[0216] According to the data in the table above, in most floor coatings that combine ultra-abrasion-resistant topcoats with various epoxy intermediate coatings, the modification of the glycidyl ether compounds of HDI trimers in component A helps to significantly improve the abrasion resistance of the overall floor coating system. In floor coatings that combine ultra-abrasion-resistant topcoats with epoxy intermediate coatings (epoxy intermediate coating 3) using modified polyetheramine as a curing agent, under normal room temperature curing conditions, the modification of the glycidyl ether compounds of HDI trimers will slightly reduce the abrasion resistance of the overall floor coating system; however, under low temperature and high humidity conditions, the modification of the glycidyl ether compounds of HDI trimers will still significantly improve the abrasion resistance of the overall floor coating system.

[0217] The addition of an appropriate amount of latent imine curing agent to component B can improve the wear resistance of the overall floor coating system, or in floor coatings that are combined with some epoxy intermediate coatings, the change in wear resistance of the overall floor coating system is the same.

[0218] Moreover, it was unexpectedly discovered that the combination of glycidyl ether-modified HDI trimer and unmodified HDI trimer within the preferred range in component A can further improve the wear resistance of flooring systems prepared by combining ultra-wear-resistant polyurethane topcoat with different types of epoxy intermediate coats; it can significantly reduce the gap in wear resistance between flooring systems prepared under low temperature and high humidity conditions and flooring systems prepared under standard room temperature conditions.

[0219] For floor coatings prepared in combination with epoxy intermediate coatings (epoxy intermediate coating 1) using modified aromatic amines as curing agents, the combination of modified HDI trimer and unmodified HDI trimer within the preferred range, and the addition of an appropriate amount of latent imine curing agent, can improve the overall wear resistance of the floor coating by about 30% to 42%.

[0220] For floor coatings prepared in combination with epoxy intermediate coatings (epoxy intermediate coating 2) using modified alicyclic amines as curing agents, the combination of modified HDI trimer and unmodified HDI trimer within the preferred range, and the addition of an appropriate amount of latent imine curing agent, can improve the overall wear resistance of the floor coating by about 30% to 37%.

[0221] For floor coatings prepared in combination with epoxy intermediate coatings (epoxy intermediate coating 3) using modified polyetheramine as a curing agent, under conventional room temperature curing conditions, the combination of modified HDI trimer and unmodified HDI trimer within the preferred range, along with the addition of an appropriate amount of latent imine curing agent, can improve the overall wear resistance of the floor coating by approximately 5% to 8%. Under low temperature and high humidity conditions, the wear resistance of the overall floor coating can be improved by approximately 15% to 20%.

[0222]

[0223] According to the data in the table above, when different coating amounts of ultra-abrasion-resistant topcoat are combined with epoxy intermediate coating (epoxy intermediate coating 3) with modified polyetheramine as curing agent, the abrasion resistance of the overall floor coating system will decrease slightly or remain the same under normal room temperature curing conditions due to the modification of glycidyl ether compounds of HDI trimer in component A; however, when cured under low temperature and high humidity conditions, the modification of glycidyl ether compounds of HDI trimer will significantly improve the abrasion resistance of the overall floor coating system.

[0224] The addition of an appropriate amount of latent imine curing agent to component B can improve the abrasion resistance of the overall floor coating system, or, with the application amount of some ultra-abrasion resistant topcoat, the change in the abrasion resistance of the overall floor coating system is almost the same.

[0225] Moreover, it was unexpectedly discovered that the combination of glycidyl ether-modified HDI trimer and unmodified HDI trimer within the preferred range in component A can further improve the wear resistance of flooring systems prepared by combining ultra-wear-resistant polyurethane topcoat with epoxy intermediate coat at different coating amounts.

[0226] When cured at normal room temperature, the coating amount is 0.1 kg / m². 2 0.15Kg / m 2 0.2Kg / m 2 In the floor coating system with the topcoat, the combination of modified HDI trimer and unmodified HDI trimer within a preferred range, along with the addition of an appropriate amount of latent imine curing agent, can improve the overall abrasion resistance of the floor coating by approximately 6%–8%, 15%–16%, and 27%–29%, respectively. When cured under low-temperature and high-humidity conditions, the overall abrasion resistance of the floor coating can be improved by approximately 16%–20%, 32%–33%, and 40%–41%, respectively. It is evident that with an increase in the amount of topcoat applied, or with extreme low-temperature and high-humidity environments, the improved ultra-abrasion-resistant polyurethane topcoat of this invention can bring about a more significant improvement in abrasion resistance.

[0227] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A super wear-resistant polyurethane floor coating, characterized in that, It includes components A, B, and C, wherein: Component A includes a polyisocyanate modified with glycidyl ether compounds; Component B includes latent imine curing agent, diluent, functional additives, pigments and fillers; Component C includes aggregate.

2. The ultra-wear-resistant polyurethane floor coating according to claim 1, characterized in that, In component A, the glycidyl ether compound is selected from butyl monoepoxy glycidyl ether and C12-14 alkyl glycidyl ether, preferably butyl monoepoxy glycidyl ether.

3. The ultra-wear-resistant polyurethane floor coating according to claim 1, characterized in that, In component A, the polyisocyanate is obtained by polymerizing an aliphatic diisocyanate monomer, wherein the aliphatic diisocyanate monomer is selected from one or more of tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, and lysine diisocyanate, preferably hexamethylene diisocyanate; The polyisocyanate is preferably a trimer of hexamethylene diisocyanate.

4. The ultra-wear-resistant polyurethane floor coating according to claim 1, characterized in that, Component A comprises: glycidyl ether-modified polyisocyanates and polyisocyanates, with the following weight proportions: 35-45 parts of glycidyl ether-modified polyisocyanate, preferably 38-42 parts; The amount of polyisocyanate is 55-65 parts, preferably 58-62 parts.

5. The ultra-wear-resistant polyurethane floor coating according to claim 1, characterized in that, The weight proportions of each component in component B are as follows: 10-40 parts of latent imine curing agent, preferably 20-30 parts; 35-45 parts diluent; Functional additives: 1.5–4 parts; 25-40 parts of pigments and fillers.

6. The ultra-wear-resistant polyurethane floor coating according to claim 1, characterized in that, In component B, the latent imine curing agent is an aliphatic imine with an amine equivalent of 135-145, preferably 140, and a viscosity of 60-80 cps. The latent imine curing agent has a mass percentage of 20% to 30% in component B; The latent imine curing agent comprises the components shown in Formula 1:

7. The ultra-wear-resistant polyurethane floor coating according to claim 5, characterized in that, In component B, the weight proportions of each component in the functional additive are as follows: The weight percentages of each component in the pigments and fillers are as follows: 15-20 parts pigment; 13-16 parts of filler.

8. The ultra-wear-resistant polyurethane floor coating according to claim 1, characterized in that, In component C, the aggregate comprises 220-mesh white corundum, 260-mesh white corundum, and 280-mesh white corundum, with the following weight proportions for each component: 20-30 parts of 220-mesh white corundum; 30-40 parts of 260-mesh white corundum; 35-45 parts of 280 mesh white corundum.

9. The ultra-wear-resistant polyurethane floor coating according to claim 1, characterized in that, The preparation method of the polyisocyanate modified by the glycidyl ether compound includes: S1. A modifier is prepared by pre-reacting glycidyl ether with a secondary amine according to a molar ratio of epoxy group to secondary amine group of (1.3-1.6):1; S2. Add the modifier prepared in S1 to the polyisocyanate and react to obtain a polyisocyanate modified with glycidyl ether compounds.

10. The method for preparing the ultra-wear-resistant polyurethane floor coating according to any one of claims 1-9, characterized in that, Includes the following steps: (1) Mix and disperse the specified amount of glycidyl ether-modified polyisocyanate and polyisocyanate evenly as component A; (2) Mix and disperse the specified amounts of diluent, functional additives, pigments and fillers, and latent imine curing agent evenly as component B; (3) Mix the specified amount of white corundum of different mesh sizes evenly to form component C; (4) When ready for use, mix components A, B and C in a mass ratio of (4-6):(2-4):(1-3) and stir evenly before application. Steps (1), (2), and (3) are not in any particular order.

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