A solvent-free super wear-resistant polyurethane floor coating and a preparation method thereof

Abstract

The present application relates to a kind of solventless super wear-resistant polyurethane floor coating and its preparation method, including A, B, C three components;A component includes: mixture of hexamethylene diisocyanate trimer, isophorone isocyanate trimer and uretdione isocyanate, siloxane coupling agent;B component includes: bio-based polyol resin, contains amino functional group polyisocyanate copolymerization reactant, wear-resistant filler, titanium white, rheological aid, dispersing agent, defoaming agent, leveling agent, catalyst, anti-scratch aid;C component includes: wear-resistant aggregate, dehydrating agent.The solventless super wear-resistant polyurethane floor coating of the present application, paint film has very high hardness (pencil hardness 6H), super strong wear resistance (wear resistance 8mg), excellent weather resistance (resistance to artificial weathering reaches 1000h), safe and reliable high skid resistance (wet friction coefficient ≥0.77) and excellent scratch resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyurethane materials, and in particular relates to a solvent-free super-wear-resistant polyurethane floor coating and a preparation method thereof. Background Art

[0002] The most commonly used floor coating at present is solvent-free epoxy coating. Although it has the advantages of strong adhesion, resistance to corrosion from general chemicals, and low price, the surface scratch resistance of this floor coating is slightly poor. Long-term use may cause more wear and scratches, which not only affects the appearance, but also affects the performance. Summary of the Invention

[0003] The object of the present invention is to solve the problem of poor scratch resistance of the floor coating surface described above, and to provide a solvent-free super-wear-resistant polyurethane floor coating and a preparation method thereof. The prepared polyurethane floor coating is a solvent-free super-wear-resistant polyurethane floor coating with excellent wear resistance, resistance to heavy impact, acid and alkali resistance, and oil resistance. The solvent-free super-wear-resistant polyurethane floor coating of the present invention has a paint film with extremely high hardness (pencil hardness 6H), super strong wear resistance (wear resistance 8mg), excellent weather resistance (resistance to artificial weathering aging reaches 1000h), safe and reliable high anti-slip properties (wet friction coefficient ≥0.77) and excellent scratch resistance.

[0004] To solve the above problems, the present invention is implemented through the following technical solutions:

[0005] The first object of the present invention is:

[0006] Provided is a solvent-free super-wear-resistant polyurethane floor coating, which comprises three components A, B, and C, wherein the mass ratio of component A: component B: component C is 3-5: 1-3: 2-4;

[0007] The A component comprises the following components in parts by weight:

[0008] 80-90 parts of a mixture of hexamethylene diisocyanate trimer, isophorone isocyanate trimer and uretdione isocyanate, and 6-10 parts of a siloxane coupling agent;

[0009] The B component comprises the following components in parts by weight:

[0010] 30-50 parts of bio-based polyol resin, 5-20 parts of polyisocyanate copolymer containing amino functional group, 20-30 parts of wear-resistant filler, 1-15 parts of titanium dioxide, 0.1-2 parts of rheological additive, 0.1-1.5 parts of dispersant, 0.1-1.5 parts of defoaming agent, 0.1-2 parts of leveling agent, 0.1-1 part of catalyst, 0.1-2 parts of anti-scratch additive;

[0011] The wear-resistant filler is one or a combination of quartz powder, barium sulfate and calcium carbonate;

[0012] The titanium dioxide is subjected to surface deposition coating modification treatment, where a layer of aluminum oxide or chromium oxide is coated on the surface of the titanium dioxide to form a protective film; the titanium dioxide content in the titanium dioxide is 94% to 95.5% by mass, the oil absorption is 17 to 20g / 100g, and the whiteness is ≥93%;

[0013] Titanium dioxide's high refractive index (anatase approximately 2.5, rutile approximately 2.7) strongly scatters visible light, providing excellent hiding power for the coating. The rutile titanium dioxide used in this invention is coated with aluminum oxide or chromium oxide, further enhancing its light and chemical resistance, preventing coating failure due to ultraviolet light or environmental corrosion. The titanium dioxide selected undergoes a special surface treatment to improve its dispersibility in the coating, ensuring color consistency and weather resistance of the coating.

[0014] The C component includes the following components in parts by weight:

[0015] 80-100 parts of wear-resistant aggregate, 2-5 parts of dehydrating agent;

[0016] The wear-resistant aggregate comprises aluminum oxide and glass powder, and the weight ratio of aluminum oxide to glass powder is 1 to 4:1.

[0017] The solvent-free super wear-resistant polyurethane floor coating of the present invention is further optimized as follows:

[0018] The weight ratio of the mixture of hexamethylene diisocyanate trimer, isophorone isocyanate trimer and uretdione isocyanate is 1-5:0.1-1:0.1-1.

[0019] The solvent-free super wear-resistant polyurethane floor coating of the present invention is further optimized as follows:

[0020] The alumina in the wear-resistant aggregate is high-strength α-type alumina; its Mohs hardness is ≥9, the appearance is white powder, the whiteness is 90-95, and the density is 3.0-3.2g / cm 3 , oil absorption 23~26g / 100g.

[0021] The solvent-free super wear-resistant polyurethane floor coating of the present invention is further optimized as follows:

[0022] The siloxane coupling agent is one or a combination of a titanate coupling agent and a silane coupling agent.

[0023] In the present invention, siloxane coupling agents (such as silane and titanate coupling agents) improve the coating properties in the solvent-free polyurethane system through the following effects:

[0024] Enhance substrate wettability: The organic end of the siloxane structure organically combines with the coating film, while the inorganic end reacts with the substrate surface (such as concrete or metal), improving the adhesion between the coating and the substrate.

[0025] Improve coating density: Siloxane reduces pores through interfacial cross-linking during film formation, thereby improving the coating's water resistance and chemical corrosion resistance.

[0026] Slipperiness and scratch resistance: The low surface energy of siloxane coupling agent makes the coating surface smoother and improves scratch resistance.

[0027] Some high molecular weight modified siloxane parts can also improve the stain resistance and anti-blocking properties of the coating.

[0028] The solvent-free super wear-resistant polyurethane floor coating of the present invention is further optimized as follows:

[0029] The bio-based polyol resin is a bio-based polyester polyol resin, which appears as a colorless, transparent liquid with a solids content greater than 99%, a viscosity of 1000-5000 cps, a hydroxyl value of 160-180 mgKOH / g, and a moisture content of 0.05% or less. The selected bio-based polyol resin, when combined with an isocyanate adduct, can be used in floor coatings, resulting in coatings with excellent impact and abrasion resistance, strong adhesion to concrete, and excellent chemical resistance.

[0030] The solvent-free super wear-resistant polyurethane floor coating of the present invention is further optimized as follows:

[0031] The polyisocyanate copolymer containing amino functional groups is a colorless transparent liquid with a viscosity of 900-2000 cps, an amine value of 199-203 mgKOH / g, a water content of ≤0.15%, and a density of 1.0-1.1 g / ml.

[0032] The solvent-free super wear-resistant polyurethane floor coating of the present invention is further optimized as follows:

[0033] It includes one or more of the following technical features: the rheological additive is one or a combination of several sheet silicate rheological additives; the combination of different morphological structures in its mineral components requires only extremely low shear force, is easy to disperse, and significantly shortens the processing time; it does not require heating or activator activation, has effective low-shear viscosity, prevents hard precipitation of pigments and fillers, reduces phase separation, and has very good pseudoplastic fluid properties; the selected sheet silicates prevent filler and pigment sedimentation by forming a thixotropic network, while enhancing the workability of the coating.

[0034] The dispersant is one or a combination of a copolymer solution containing an acidic group, an alkylamine salt of a high molecular weight copolymer, an acrylic copolymer solution containing a basic pigment affinity group, and a modified polyacrylate;

[0035] The leveling agent is one or a combination of polyether-modified polydimethylsiloxane and polyether-siloxane copolymer; polyether-modified polydimethylsiloxane or polyether-siloxane copolymer can reduce surface tension, ensure uniform leveling of the coating, and avoid shrinkage holes and fish-eye defects.

[0036] The defoaming agent is one or a combination of an organosilicon defoaming agent and a polymer defoaming agent that does not contain organosilicon. The organosilicon defoaming agent and the polymer defoaming agent that does not contain organosilicon can quickly eliminate bubbles introduced during the construction process by reducing the liquid-gas interfacial tension, thereby ensuring a smooth and flat coating.

[0037] The catalyst is one or a combination of an organic tin catalyst and an organic bismuth catalyst;

[0038] The selected catalyst is a light yellow to brown transparent liquid that is easily soluble in common polyurethane raw materials such as polyether polyol plasticizers; it does not contain regulated heavy metals or toxic phthalates; it significantly increases the curing speed and has significantly higher catalytic activity than dibutyltin dilaurate. It has the following characteristics:

[0039] 1. High catalytic activity. It exhibits excellent catalytic activity towards hexamethylene diisocyanate trimer, isophorone isocyanate trimer and uretdione isocyanate, shortening the tack-free time by one-third (or even shorter, depending on the NCO% of the formula), and significantly improving the post-curing speed.

[0040] 2. It has a fast surface and actual drying effect at low temperatures in winter, especially in the mid-to-late drying stage of coating curing. It overcomes the drawback of slow drying of organotin driers at low temperatures in winter. Tested at low temperatures (5°C) and ambient humidity of 10-30%, it still maintains high drying activity, halving the actual drying time compared to using dibutyltin dilaurate, demonstrating excellent performance.

[0041] 3. Environmentally friendly. Does not contain butyltin and restricted heavy metals that are subject to environmental regulations.

[0042] The anti-scratch additive is one or a combination of an organic silicon slip agent and a wax additive.

[0043] The second object of the present invention is:

[0044] Provided is a method for preparing the aforementioned solvent-free super-wear-resistant polyurethane floor coating, which comprises the following preparation steps:

[0045] Preparation of component A:

[0046] Weigh a mixture of hexamethylene diisocyanate trimer, isophorone isocyanate trimer, and uretdione isocyanate, and a siloxane coupling agent according to the formula ratio, and stir them evenly to obtain component A;

[0047] Preparation of component B:

[0048] Weigh the defoaming agent, dispersant, rheological additive, and polyisocyanate copolymer containing amino functional groups according to the formula ratio and add them to the bio-based polyol resin. After uniform dispersion, add the wear-resistant filler and titanium dioxide and grind to a suitable fineness. Then add the leveling agent, catalyst, and anti-scratch additive and stir evenly to obtain component B.

[0049] Preparation of component C:

[0050] Weigh the wear-resistant aggregate and dehydrating agent according to the formula ratio, mix them evenly, and obtain component C;

[0051] Preparation of solvent-free super wear-resistant polyurethane floor coating:

[0052] The above components A, B and C are stirred and mixed in proportion to obtain a solvent-free super wear-resistant polyurethane floor coating.

[0053] The coating system of the solvent-free super wear-resistant polyurethane floor coating of the present invention is successfully developed by reacting a mixture of hexamethylene diisocyanate trimer, isophorone isocyanate trimer and uretdione isocyanate with a bio-based polyol resin and a polyisocyanate copolymer containing amino functional groups to generate a highly cross-linked high-strength paint film, the interface strengthening effect of the siloxane coupling agent, the synergy of wear-resistant fillers and aggregates, and the functional optimization of the additives. A solvent-free polyurethane floor coating with ultra-high wear resistance, weather resistance and environmental protection has been successfully developed to meet the high performance requirements of modern buildings.

[0054] The solvent-free super-wear-resistant polyurethane floor coating of the present invention itself has a high-strength paint film, and is combined with super-scratch-resistant wear-resistant aggregate and surface anti-scratch additives to effectively improve the surface scratch resistance of the resin coating and extend the service life of the floor; at the same time, it has a frosted surface and a soft reflective effect, therefore, it can meet the requirements of modern architecture.

[0055] The bio-based polyol resin selected in the present invention has good miscibility and dilutability in the polyurethane coating system, as well as good leveling properties, and can enhance the gloss, strength, and adhesion of the paint film. Furthermore, the selected resin is non-toxic, low-odor, and safe to use, and is not classified as a hazardous substance under regulations. Furthermore, the resin has good stability and will not oxidize and decompose during natural storage.

[0056] The bio-based polyol resin selected in the present invention has the following characteristics:

[0057] Cross-linking: The reaction of bio-based polyol resin and aliphatic isocyanate forms the matrix structure of the polyurethane coating. The coating has excellent wear resistance and impact resistance, and has strong adhesion to concrete.

[0058] Environmental protection and stability: Bio-based polyol resin does not contain harmful solvents and has low odor, which meets modern environmental protection needs. It is highly stable and not easily oxidized or degraded. The coating has excellent chemical resistance, which extends the storage life and service life of the coating.

[0059] The amino-functional polyisocyanate copolymers used in the present invention have the following characteristics:

[0060] Cross-linking: Polyisocyanate copolymers containing amino functional groups have amino groups that can react with isocyanates to form polyurethane coatings that are wear-resistant, weather-resistant, chemical-resistant, and water-resistant and have good adhesion.

[0061] In particular, the presence of bio-based polyol resin and polyisocyanate copolymer containing amino functional groups works synergistically to increase the reaction speed, quickly build strength and quickly adhere; at the same time, it effectively increases the cross-linking density, enabling super wear resistance to be achieved.

[0062] In the present invention, the wear-resistant filler and the wear-resistant aggregate have a synergistic effect.

[0063] Wear-resistant fillers include quartz powder, barium sulfate and other fillers:

[0064] Quartz powder has high hardness (about 7 on the Mohs hardness scale);

[0065] The high density of barium sulfate particles further improves the wear and impact resistance of the coating.

[0066] Through the optimization of dispersant treatment, the wear-resistant filler is evenly distributed in the coating film, reducing sedimentation and stratification.

[0067] Wear-resistant aggregates include alumina and glass powder:

[0068] Alumina microparticles form a hard friction layer on the coating surface, enhancing anti-slip properties. The aggregate particle size and ratio (alumina to glass powder 1-4:1) have been optimized to balance leveling and abrasion resistance.

[0069] The present invention selects a mixture of a specific hexamethylene diisocyanate trimer, an isophorone isocyanate trimer and a uretdione isocyanate.

[0070] The hexamethylene diisocyanate trimer undergoes a cross-linking reaction with the bio-based polyol resin and amino-functional polyisocyanate copolymer in component B, forming a highly cross-linked polyurethane network. This increases cross-link density: The multiple -NCO groups in the hexamethylene diisocyanate trimer molecule react completely with the hydroxyl and amino groups, forming a highly cross-linked polyurethane network that imparts high hardness and abrasion resistance to the coating. Furthermore, the hexamethylene diisocyanate trimer structure lacks benzene rings, imparting excellent yellowing and weather resistance to the coating, making it particularly suitable for outdoor use. The saturated bonds in the hexamethylene diisocyanate trimer molecule provide excellent light stability, preventing UV-induced degradation.

[0071] Hexamethylene diisocyanate trimer further increases the cross-linking density of the cured coating and improves the wear resistance through the electron-withdrawing effect of the isocyanurate ring.

[0072] Uretdione isocyanates, a chemical structure containing urea and ketone groups, exhibit excellent reactivity and can form cross-linking networks with bio-based polyol resins and amino-functional polyisocyanate copolymers. The strong structural stability and chemical resistance of uretdione isocyanates result in paint films with high hardness, excellent abrasion resistance, and impact resistance, as well as strong resistance to acids, bases, solvents, and other corrosive substances.

[0073] Isophorone isocyanate trimer can undergo cross-linking reaction with bio-based polyol resin and polyisocyanate copolymer containing amino functional groups to form a network structure, providing the paint film with high hardness and wear resistance as well as good UV resistance. It can effectively prevent the floor coating from yellowing or fading under sunlight, and can enhance the coating's resistance to acids, alkalis, solvents and other chemicals.

[0074] In summary, the solvent-free super wear-resistant polyurethane floor coating and the preparation method thereof of the present invention have the following beneficial effects:

[0075] 1. Select bio-based polyol resin and polyisocyanate copolymer containing amino functional groups, which have good compatibility, safety and environmental protection, and the paint film has good wear resistance, impact resistance and chemical resistance.

[0076] 2. By selecting a mixture of specific hexamethylene diisocyanate trimer, isophorone isocyanate trimer and uretdione isocyanate, the paint film has excellent weather resistance and is not easy to yellow; it also has superb wear resistance and high surface hardness, and good resistance to acids, alkalis, solvents and other chemicals.

[0077] 3. Preferably, high-strength α-alumina with a Mohs hardness of up to 9 is introduced to improve the basic wear resistance of the paint film.

[0078] 4. Preferably, by introducing environmentally friendly high-efficiency organotin catalyst, environmentally friendly organic bismuth catalyst; the catalytic activity is significantly improved than dibutyltin dilaurate. The touch non-stick time is shortened by one third (even shorter, related to the NCO% of the formula); it makes early strength and fast drying possible. The surface drying is fast at low temperature in winter, the high-efficiency catalytic drying activity is maintained at low temperature (5℃), the catalytic drying time is shortened by one time compared with using dibutyltin dilaurate, and it is environmentally friendly. It does not contain environmentally friendly regulated butyl tin, limited heavy metals, etc.

[0079] 5. By adding anti-scratch additives (such as silicone slip agent, wax additive, etc.), the scratch resistance of the paint film surface is further improved.

[0080] 6. The whole system is designed to be solvent-free, with low VOC content, meeting the requirements of modern environmental protection regulations; it does not contain free diisocyanate (such as TDI or HDI monomer), and the construction process is safe and reliable. DETAILED DESCRIPTION

[0081] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is described in detail below with specific examples. It should be understood that the specific examples described here are only for the purpose of explaining the present application, and are not limited to the present application. Any simple improvement of the preparation method of the present application under the concept of the present application is within the scope of protection of the present application.

[0082] The raw materials used in the technical scheme and examples of the present application are as shown in Table 1 below.

[0083] Table 1

[0084]

[0085] Example 1

[0086] A preparation method of a solvent-free super wear-resistant polyurethane floor coating, comprising the following preparation steps:

[0087] Preparation of component A:

[0088] The mixture of 80 parts of hexamethylene diisocyanate trimer, isophorone diisocyanate trimer and uretdione diisocyanate, 6 parts of silane coupling agent, was stirred uniformly to obtain component A;

[0089] The weight ratio of the mixture of hexamethylene diisocyanate trimer, isophorone diisocyanate trimer and uretdione diisocyanate is 4:0.5:0.5;

[0090] Preparation of component B:

[0091] According to the formula ratio, 0.6 parts of defoaming agent, 0.5 parts of dispersant, 0.5 parts of rheological additive, and 10 parts of polyisocyanate copolymer containing amino functional groups were weighed and added to 30 parts of bio-based polyol resin. After uniform dispersion, 30 parts of wear-resistant filler and 10 parts of titanium dioxide were added and ground to a suitable fineness. Then, 0.5 parts of leveling agent, 1 part of catalyst, and 1 part of anti-scratch additive were added and stirred evenly to obtain component B.

[0092] Preparation of component C:

[0093] Weigh 80 parts of wear-resistant aggregate and 4 parts of dehydrating agent according to the formula ratio, mix them evenly to obtain component C;

[0094] Preparation of solvent-free super wear-resistant polyurethane floor coating:

[0095] The above components A, B, and C are stirred and mixed in proportion to obtain a solvent-free super wear-resistant polyurethane floor coating, with the mass ratio of component A: component B: component C being 5:2.4:3.

[0096] Example 2

[0097] A method for preparing a solvent-free super-wear-resistant polyurethane floor coating comprises the following preparation steps:

[0098] Preparation of component A:

[0099] Weigh 90 parts of a mixture of hexamethylene diisocyanate trimer, isophorone isocyanate trimer, and uretdione isocyanate and 10 parts of a siloxane coupling agent according to the formula ratio, stir them evenly, and obtain component A;

[0100] The weight ratio of the mixture of hexamethylene diisocyanate trimer, isophorone isocyanate trimer and uretdione isocyanate is 4:1:0.5;

[0101] Preparation of component B:

[0102] According to the formula ratio, 0.6 parts of defoaming agent, 0.5 parts of dispersant, 0.5 parts of rheological additive, and 15 parts of polyisocyanate copolymer containing amino functional groups were weighed and added to 30 parts of bio-based polyol resin. After uniform dispersion, 30 parts of wear-resistant filler and 10 parts of titanium dioxide were added and ground to a suitable fineness. Then, 0.5 parts of leveling agent, 1.5 parts of catalyst, and 1 part of anti-scratch additive were added and stirred evenly to obtain component B.

[0103] Preparation of component C:

[0104] Weigh 90 parts of wear-resistant aggregate and 5 parts of dehydrating agent according to the formula ratio, mix them evenly to obtain component C;

[0105] Preparation of solvent-free super wear-resistant polyurethane floor coating:

[0106] The above components A, B, and C are stirred and mixed in proportion to obtain a solvent-free super wear-resistant polyurethane floor coating, with the mass ratio of component A: component B: component C being 5:2.4:3.

[0107] Comparative Example 1 and Comparative Example 2 are commercially available solvent-free super wear-resistant polyurethane floor coatings.

[0108] The performance of the solvent-free super wear-resistant polyurethane floor coatings prepared in Examples 1 and 2 was tested in accordance with the national standard GB / T22374-2018. The test results are shown in Table 2.

[0109] Table 2 Performance test results of the coatings of the embodiments and comparative examples

[0110]

[0111]

[0112] It can be seen from Table 2 that the solvent-free super wear-resistant polyurethane floor coating prepared by the present invention has excellent properties such as wear resistance, resistance to heavy impact, acid and alkali resistance, oil resistance, and resistance to artificial aging; while Comparative Examples 1 and 2 have corresponding defects in resistance to artificial aging, VOC, wear resistance, pencil hardness, TVOC, etc.

[0113] In summary, the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the scope of the technical solution of the present invention using the disclosed technical content shall be regarded as equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

[0114] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] The experimental methods in the present invention where specific conditions are not specified are generally based on conventional conditions or conditions recommended by the manufacturer.

[0116] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0117] Unless otherwise indicated, percentages and parts are by weight.

[0118] Experimental methods without specific conditions specified in the instructions and examples are generally performed under conventional conditions or conditions recommended by the manufacturer.

[0119] Unless otherwise specified, the various raw materials, reagents, and components used in the present invention are corresponding raw materials commonly used in the art.

[0120] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein can be applied to the methods of the present invention.

Claims

1. A solvent-free, ultra-wear-resistant polyurethane floor coating, characterized by: It includes three components A, B, and C, with the mass ratio of component A: component B: component C being 3-5: 1-3: 2-4; The A component comprises the following components in parts by weight: 80-90 parts of a mixture of hexamethylene diisocyanate trimer, isophorone diisocyanate trimer and Wanhua Chemical HB-200, and 6-10 parts of a siloxane coupling agent; The B component comprises the following components in parts by weight: 30-50 parts of bio-based polyol resin, 5-20 parts of polyisocyanate copolymer containing amino functional group, 20-30 parts of wear-resistant filler, 1-15 parts of titanium dioxide, 0.1-2 parts of rheological additive, 0.1-1.5 parts of dispersant, 0.1-1.5 parts of defoaming agent, 0.1-2 parts of leveling agent, 0.1-1 part of catalyst, 0.1-2 parts of anti-scratch additive; The wear-resistant filler is one or a combination of quartz powder, barium sulfate and calcium carbonate; The titanium dioxide is subjected to surface deposition coating modification treatment, where a layer of aluminum oxide or chromium oxide is coated on the surface of the titanium dioxide to form a protective film; the titanium dioxide content by mass in the titanium dioxide is 94% to 95.5%, the oil absorption is 17 to 20 g / 100 g, and the whiteness is ≥93%; The C component includes the following components in parts by weight: 80-100 parts of wear-resistant aggregate, 2-5 parts of dehydrating agent; The wear-resistant aggregate comprises aluminum oxide and glass powder, and the weight ratio of aluminum oxide to glass powder is 1 to 4:

1.

2. The solvent-free super wear-resistant polyurethane floor coating according to claim 1, characterized in that: The weight ratio of the mixture of hexamethylene diisocyanate trimer, isophorone diisocyanate trimer and Wanhua Chemical HB-200 is 1-5:0.1-1:0.1-1.

3. The solvent-free super wear-resistant polyurethane floor coating according to claim 1, characterized in that: The alumina in the wear-resistant aggregate is high-strength α-type alumina; its Mohs hardness is ≥9, the appearance is white powder, the whiteness is 90-95, and the density is 3.0-3.2g / cm 3 , oil absorption 23~26g / 100g.

4. The solvent-free super wear-resistant polyurethane floor coating according to claim 1, characterized in that: The bio-based polyol resin is a bio-based polyester polyol resin, which has the appearance of a colorless transparent liquid, a solid content greater than 99%, a viscosity of 1000-5000 cps, a hydroxyl value of 160-180 mgKOH / g, and a water content of ≤0.05%.

5. The solvent-free super wear-resistant polyurethane floor coating according to claim 1, characterized in that: The polyisocyanate copolymer containing amino functional groups is a colorless transparent liquid with a viscosity of 900 to 2000 cps, an amine value of 199 to 203 mgKOH / g, a water content of ≤0.15%, and a density of 1.0 to 1.1 g / ml.

6. The solvent-free super wear-resistant polyurethane floor coating according to claim 1, characterized in that: It includes one or more of the following technical features: The rheological additive is one or a combination of sheet silicate rheological additives; The dispersant is one or a combination of a copolymer solution containing an acidic group, an alkylamine salt of a high molecular weight copolymer, an acrylic copolymer solution containing a basic pigment affinity group, and a modified polyacrylate; The leveling agent is one or a combination of polyether-modified polydimethylsiloxane and polyethersiloxane copolymer; The defoaming agent is one or a combination of an organosilicon defoaming agent and a polymer defoaming agent that does not contain organosilicon; The catalyst is one or a combination of an organic tin catalyst and an organic bismuth catalyst; The anti-scratch additive is one or a combination of an organic silicon slip agent and a wax additive.

7. A method for preparing the solvent-free super-wear-resistant polyurethane floor coating according to claim 1, characterized in that: It includes the following preparation steps: Preparation of component A: Weigh a mixture of hexamethylene diisocyanate trimer, isophorone diisocyanate trimer, Wanhua Chemical HB-200, and a siloxane coupling agent according to the formula ratio, stir well, and obtain component A; Preparation of component B: Weigh the defoaming agent, dispersant, rheological additive, and polyisocyanate copolymer containing amino functional groups according to the formula ratio and add them to the bio-based polyol resin. After uniform dispersion, add the wear-resistant filler and titanium dioxide and grind to a suitable fineness. Then add the leveling agent, catalyst, and anti-scratch additive and stir evenly to obtain component B. Preparation of component C: Weigh the wear-resistant aggregate and dehydrating agent according to the formula ratio, mix them evenly, and obtain component C; Preparation of solvent-free super wear-resistant polyurethane floor coating: The above components A, B and C are stirred and mixed in proportion to obtain a solvent-free super wear-resistant polyurethane floor coating.

Images