A bio-based polyurethane grinding stone coating and its application, a bio-based polyurethane grinding stone floor and its preparation method

Abstract

The present invention belongs to the technical field of building materials, and specifically relates to a bio-based polyurethane grindstone coating and its application, a bio-based polyurethane grindstone floor and its preparation method. The bio-based polyurethane grindstone coating provided by the present invention comprises component A and component B; the component A comprises the following components in percentage by mass: 60-80% of bio-based polyester polyol, 4-5% of defoaming agent, 4-5% of pigment, 7-18% of quartz powder, and 5-12% of coarse aggregate; the component B is a curing agent, and the curing agent is a modified polyisocyanate. The bio-based polyurethane grindstone coating obtained by the present invention has a high solid content, and the formed polyurethane grindstone floor has excellent crack resistance, weather resistance, durability and wear resistance, a long life cycle, high aesthetics, seamless overall, resistant to concrete cracks, and does not require other anti-cracking layers and has a light weight. At the same time, the bio-based polyurethane grindstone coating provided by the present invention meets the national carbon neutrality standards and has the advantages of emission reduction, environmental protection and low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and in particular relates to a bio-based polyurethane grindstone coating and an application thereof, a bio-based polyurethane grindstone floor and a preparation method thereof. Background Art

[0002] Flooring refers to the floor that is constructed using specific materials and processes to treat the original floor and presents a certain decorative and functional floor, such as epoxy self-leveling floor, corundum wear-resistant floor, epoxy terrazzo floor, cement-based terrazzo, epoxy colored sand floor, epoxy anti-static floor, epoxy anti-slip floor, polyurea anti-corrosion floor, polyurethane floor, silicon PU floor, concrete sealing and curing agent floor, etc.

[0003] Terrazzo flooring is a type of flooring. Terrazzo is a product made by mixing aggregates such as crushed stone, glass, quartz stone into cement binder to form a concrete product, and then surface grinding and polishing. Terrazzo made of cement binder is called inorganic terrazzo, and terrazzo made of epoxy binder is also called epoxy terrazzo or organic terrazzo. Terrazzo is divided into on-site cast terrazzo and prefabricated terrazzo floor according to the construction and production process.

[0004] However, the commonly used terrazzo floors mentioned above have the following problems: the base material is generally rigid cement or thermosetting epoxy resin, the material itself is very rigid / brittle, and is prone to cracking due to environmental changes and uneven force; it is hard, and its poor flexibility affects the comfort experience when used in indoor public places, and it is easy to cause noise pollution; it is difficult to construct and non-renewable, and is not suitable for indoor entertainment venues with strong design sense and high update speed.

[0005] Chinese patent CN113549389A discloses a renewable elastic polyurethane grinding stone material and its application, but the raw materials of the polyurethane grinding stone material disclosed in the patent are complex and the cost is high. Summary of the Invention

[0006] The present invention aims to provide a bio-based polyurethane grinding stone coating and its application, a bio-based polyurethane grinding stone floor and its preparation method. The polyurethane grinding stone floor formed by the bio-based polyurethane grinding stone coating provided by the present invention has excellent crack resistance, weather resistance, durability, and wear resistance. It has a long life cycle, high aesthetics, is seamless as a whole, resists concrete cracks, does not require other anti-cracking layers, and has a light weight. At the same time, the bio-based polyurethane grinding stone coating provided by the present invention meets the national carbon neutrality standards and has the advantages of emission reduction, environmental protection, and low cost.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a bio-based polyurethane grinding stone coating, comprising component A and component B;

[0009] The A component includes the following components in percentage by mass:

[0010] Bio-based polyester polyol 60-80%, defoamer 4-5%, pigment 4-5%, quartz powder 7-18%, coarse aggregate 5-12%;

[0011] The B component is a curing agent, and the curing agent is modified polyisocyanate.

[0012] Preferably, the mass ratio of component A to component B is (5-6):1.

[0013] Preferably, the bio-based polyester polyol is Savimo castor oil modified polyol.

[0014] Preferably, the mesh size of the quartz powder is 300-400 mesh; the average particle size of the coarse aggregate is 5-8 mm; the defoaming agent is a silicone defoaming agent; the coarse aggregate includes one or more of marble chips, glass, mine quartz, amethyst, turquoise, white marble, white crystal, colored glass, agate and shells.

[0015] The present invention provides the use of the bio-based polyurethane grindstone coating described in the above technical solution in the preparation of polyurethane grindstone floors.

[0016] The present invention provides a method for preparing a bio-based polyurethane grindstone floor, comprising the following steps:

[0017] Applying the grindstone primer on the surface of the foundation to obtain a primer-treated foundation;

[0018] Component A and component B of the bio-based polyurethane grindstone coating described in the above technical solution are mixed to obtain a grindstone mixture; the grindstone mixture is coated on the surface of the foundation treated with the primer to obtain a bio-based polyurethane grindstone surface layer, thereby obtaining the bio-based polyurethane grindstone floor.

[0019] Preferably, the thickness of the bio-based polyurethane grindstone surface layer is 8 to 10 mm.

[0020] Preferably, after obtaining the primer-treated foundation and before applying the grindstone mixture, the method further comprises: preparing an elastic polyurethane leveling pad on the surface of the primer-treated foundation, wherein the thickness of the elastic polyurethane leveling pad is 3 to 5 mm.

[0021] Preferably, after obtaining the bio-based polyurethane grindstone surface layer, the process further includes sealing the bio-based polyurethane grindstone surface layer with a covering material to obtain a covering layer, thereby obtaining the bio-based polyurethane grindstone floor.

[0022] The present invention provides a bio-based polyurethane grindstone floor prepared by the preparation method described in the above technical solution.

[0023] The present invention provides a bio-based polyurethane grinding stone coating, comprising component A and component B. Component A comprises the following components in percentage by weight: 60-80% bio-based polyester polyol, 4-5% defoamer, 4-5% pigment, 7-18% quartz powder, and 5-12% coarse aggregate. Component B is a curing agent, which is a modified polyisocyanate. The present invention utilizes bio-based polyester polyol as the primary component of the polyurethane grinding stone coating, with auxiliary defoamer, pigment, quartz powder filler, and coarse aggregate as auxiliary components. By strictly controlling the mass ratio of these components, the resulting bio-based polyurethane grinding stone coating has a high solids content. The resulting polyurethane grinding stone floor exhibits excellent crack resistance, weather resistance, durability, and wear resistance. It has a long lifespan, high aesthetics, is seamless, resists concrete cracks, requires no additional anti-cracking layer, and is lightweight.

[0024] At the same time, the present invention uses renewable bio-based polyester polyols as bio-based raw materials to replace traditional fossil raw materials. The bio-based polyester polyols are processed and produced using biomass such as soybean oil or castor oil as raw materials. The bio-based content of the bio-based polyester polyols is as high as 65-100%. Therefore, the bio-based polyurethane grindstone coating provided by the present invention meets the national carbon neutrality standards and has the advantages of emission reduction, environmental protection and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a physical picture of the bio-based polyurethane grindstone floor prepared according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention provides a bio-based polyurethane grinding stone coating, comprising component A and component B;

[0027] The A component includes the following components in percentage by mass:

[0028] Bio-based polyester polyol 60-80%, defoamer 4-5%, pigment 4-5%, quartz powder 7-18%, coarse aggregate 5-12%;

[0029] The B component is a curing agent, and the curing agent is modified polyisocyanate.

[0030] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0031] The bio-based polyurethane grinding stone coating provided by the present invention comprises an A component.

[0032] Component A comprises 60-80% by weight, preferably 65-75% by weight, of a bio-based polyester polyol. In the present invention, the bio-based polyester polyol is a Savimore castor oil-modified polyol. In a specific embodiment of the present invention, the bio-based polyester polyol is specifically a Savimore castor oil-modified polyol produced by BASF.

[0033] In terms of mass percentage, the component A comprises 4-5%, preferably 4.2-4.5% of the defoaming agent. In the present invention, the defoaming agent is preferably an organosilicon defoaming agent.

[0034] In terms of mass percentage, the A component comprises 4-5%, preferably 4.2-4.6% of pigment. In the present invention, the pigment is preferably a polyurethane pigment.

[0035] In terms of mass percentage, the component A comprises 7-18%, preferably 7.5-15% of quartz powder. In the present invention, the mesh size of the quartz powder is 300-400 meshes.

[0036] Component A comprises 5-12% by mass, preferably 5-10% by mass, of coarse aggregate. In the present invention, the coarse aggregate preferably comprises one or more of marble chips, glass, mined quartz, amethyst, turquoise, white marble, white crystal, colored glass, agate, and shell. The average particle size of the coarse aggregate is preferably 5-8 mm.

[0037] The bio-based polyurethane grinding stone coating provided by the present invention includes component B. Component B is a curing agent, and the curing agent is a modified polyisocyanate. In a specific embodiment of the present invention, the modified polyisocyanate is purchased from BASF and is a product model HI100 curing agent.

[0038] In the present invention, the mass ratio of the component A to the component B is preferably (5-6):1, more preferably 5:1.

[0039] The present invention provides the use of the bio-based polyurethane grindstone coating described in the above technical solution in the preparation of polyurethane grindstone floors.

[0040] The bio-based polyurethane grinding stone coating provided by the present invention is lightweight, low-load bearing, has excellent resistance to foundation deformation, and is UV-resistant and non-yellowing. The bio-based polyurethane grinding stone coating provided by the present invention is preferably used in indoor and outdoor flooring in shipbuilding, office, medical, educational, entertainment, residential, exhibition hall, or retail locations, including luxury cruise ships, luxury CBD office spaces, hospitals, schools, hotels, commercial plazas, administrative offices, corporate showrooms, museums, libraries, art galleries, civic centers, research institutes, shops, or private villas. The preferred substrates include cement-based substrates, glass-roofed building substrates, or steel structure substrates.

[0041] The present invention provides a method for preparing a bio-based polyurethane grindstone floor, comprising the following steps:

[0042] Applying the grindstone primer on the surface of the foundation to obtain a primer-treated foundation;

[0043] Component A and component B of the bio-based polyurethane grindstone coating described in the above technical solution are mixed to obtain a grindstone mixture; the grindstone mixture is coated on the surface of the foundation treated with the primer to obtain a bio-based polyurethane grindstone surface layer, thereby obtaining the bio-based polyurethane grindstone floor.

[0044] The present invention applies a grindstone primer (hereinafter referred to as the first coating) to the foundation surface to obtain a primer-treated foundation. In the present invention, the foundation includes a cement foundation, a glass foundation, or a steel structure foundation. Before applying the grindstone primer, the present invention preferably pre-treats the foundation surface. In the present invention, the pre-treatment preferably includes sandblasting, and the sandblasting is preferably performed using a vacuum sandblaster. When there are cracks on the foundation surface, the pre-treatment preferably also includes: repairing the cracks on the foundation surface after sandblasting. The repair is preferably performed when the cracks are 1 to 5 mm. The material used for the repair is preferably a mixture of polyurethane primer and quartz sand. The mass ratio of the polyurethane primer to quartz sand is preferably 3:1. During the repair, the present invention preferably extends at least 600 mm along the length of the crack, or covers the entire foundation surface. In the present invention, the roughness level of the foundation surface after pre-treatment is ≥ CSP-3 level. The moisture content of the foundation surface is ≤8%. The foundation surface is preferably oil-free.

[0045] In the present invention, the grinding stone primer is preferably a polyurethane primer, and the polyurethane primer preferably includes a polyurethane resin primer component and a curing agent. The present invention has no special requirements on the source of the polyurethane resin primer. During the first coating, the coating amount of the grinding stone primer is preferably 0.13 to 0.22 kg / m 2 The first coating preferably includes beach coating and roller coating. The temperature of the first coating is preferably 10-25° C., and the time of the first coating is ≤30 min.

[0046] In the present invention, after obtaining the primer-treated foundation and before applying the grindstone mixture, the present invention further includes: preparing an elastic polyurethane leveling pad on the primer-treated foundation surface. The elastic polyurethane leveling pad preferably has a thickness of 3 to 5 mm. In the present invention, the polyurethane paint used for the elastic polyurethane leveling pad preferably includes a polyurethane resin component and a curing agent. The present invention has no special requirements for the preparation method of the elastic polyurethane leveling pad.

[0047] After obtaining a primer-treated foundation or an elastic polyurethane screed, the present invention mixes Component A and Component B of the bio-based polyurethane screed coating described in the above technical solution to produce a screed mixture. This screed mixture is then applied (hereinafter referred to as a second coating) to the primer-treated foundation or elastic polyurethane screed to produce a bio-based polyurethane screed surface layer, thereby producing the bio-based polyurethane screed floor. In the present invention, the mixing preferably includes the following steps: a first mixing of the bio-based polyester polyol in Component A and Component B to produce a first mixture; a second mixing of the first mixture, a defoamer, a pigment, and quartz powder to produce a second mixture; and a third mixing of the second mixture and the coarse aggregate. The first mixing is preferably performed in a drum blender, preferably with stirring, and the first mixing time is preferably 2 minutes. The second mixing is preferably performed in a drum blender, preferably with stirring, and the second mixing time is preferably 2 minutes. The present invention does not have any specific requirements for the second mixing time, as long as the components are evenly mixed. The third mixing is preferably performed with stirring, and the third mixing time is preferably 3-4 minutes. In the present invention, the temperature of the second coating is preferably 10 to 35°C, and the time of the second coating is preferably ≤50min. The second coating is preferably performed by spreading the grindstone mixture along a straight line, and then using a straight-edged trowel to flatten the aggregate to the maximum particle size as the appropriate thickness, and using a trowel to flatten the aggregate. In the present invention, in order to improve the density of the bio-based polyurethane grindstone surface layer, the present invention preferably uses a mechanical troweling method for the final troweling construction. In the present invention, the initial grindstone surface layer is directly obtained after the second coating is completed. The present invention preferably cures the initial grindstone surface layer to obtain the bio-based polyurethane grindstone surface layer. The curing time is preferably 12 to 16 hours, and the temperature of the foundation during the curing is preferably 20 to 21°C.

[0048] In the present invention, the thickness of the bio-based polyurethane grindstone surface layer is preferably 8 to 10 mm.

[0049] A bio-based polyurethane grindstone surface layer is obtained. The present invention preferably performs post-processing on the bio-based polyurethane grindstone surface layer, and the post-processing preferably includes the following steps: grinding, slurrying and polishing. The grinding preferably includes primary grinding and intermediate grinding. The primary grinding is preferably performed using a 24-56 mesh diamond grinding disc. When the coarse aggregate in the A component is preferably glass, the primary grinding is preferably wet grinding, and the wet grinding is preferably performed using a diamond grinding head for wet grinding and a lightweight grinder for coarse grinding. The intermediate grinding is preferably performed using 80 mesh diamond sand or a diamond grinding disc for intermediate grinding.

[0050] After the polishing is completed, the present invention preferably cleans the polished surface and then performs grouting. The grouting is preferably performed using the aforementioned bio-based polyurethane grinding stone coating. The grouting is preferably performed using a straight-edged trowel to scrape the grinding stone mixture onto the surface and fill the holes with the slurry. After grouting, the present invention preferably polishes the grouting surface 18 to 24 hours later at a foundation temperature of 24°C.

[0051] In the present invention, the polishing is preferably performed using a diamond grinding disc or a resin grinding disc with a mesh size of ≥120.

[0052] In the present invention, after the post-treatment is completed, the present invention preferably further comprises sealing the post-treated bio-based polyurethane grindstone surface layer to obtain a topcoat layer, thereby obtaining the bio-based polyurethane grindstone floor. The sealing is preferably performed using a topcoat material, preferably a polyurethane grindstone topcoat material or wax water. The sealing is preferably performed by roller coating using a short-nap roller. The roller coating is preferably performed ≥2 times.

[0053] The present invention provides a bio-based polyurethane grindstone floor prepared by the preparation method described in the above technical solution. The bio-based polyurethane grindstone floor provided by the present invention includes a bio-based polyurethane grindstone surface layer provided on the surface of the foundation after the primer treatment, and the thickness of the bio-based polyurethane grindstone surface layer is preferably 8 to 10 mm. The bio-based polyurethane grindstone floor provided by the present invention preferably also includes an elastic polyurethane leveling pad layer provided between the foundation after the primer treatment and the bio-based polyurethane grindstone surface layer, and the thickness of the elastic polyurethane leveling pad layer is preferably 3 to 5 mm. The bio-based polyurethane grindstone floor provided by the present invention preferably also includes a topcoat layer provided on the surface of the bio-based polyurethane grindstone surface layer.

[0054] The bio-based polyurethane terrazzo floor provided by the present invention does not crack, is seamless, quiet and noise-reducing, comfortable to the touch, has Class A fire protection, is relatively non-slip, can be recycled and repeatedly renewed, is weather-resistant and aging-resistant, and does not yellow. It can be used in outdoor environments and is applicable to various indoor and outdoor areas, including ships, high-end administrative offices, medical institutions, education and entertainment, and other public or private spaces. For example: luxury cruise ships, hospitals, schools, hotels, commercial plazas, administrative offices (including luxury CBD office spaces), corporate exhibition halls, museums, libraries, art galleries, civic centers, research institutes, shops, private villas, etc. It can withstand heavy pressure and can be used outdoors or on glass-topped building areas, steel structures, and other base surfaces.

[0055] The properties of the bio-based polyurethane grindstone floor provided by the present invention are compared with the epoxy grindstone / inorganic grindstone in the prior art as shown in Table 1.

[0056] Table 1 Comparison of properties of the bio-based polyurethane grindstone floor provided by the present invention and the epoxy grindstone / inorganic grindstone in the prior art

[0057]

[0058] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0059] Example 1

[0060] This embodiment provides a bio-based polyurethane grinding stone coating, including component A and component B; component A includes the following components in percentage by weight:

[0061] The product comprises 80% bio-based polyester polyol (Savymore castor oil-modified polyol produced by BASF), 4% defoamer, 4% pigment, 7% quartz powder (300 mesh), and 5% coarse aggregate (average particle size 5-8mm, marble chips and glass chips). Component B is a curing agent, which is a modified polyisocyanate. The mass ratio of bio-based polyester polyol to modified polyisocyanate is 5:1.

[0062] This embodiment provides a bio-based polyurethane terrazzo floor, the preparation method of which specifically includes:

[0063] 1. Base surface treatment

[0064] 1) All base surfaces must be properly prepared to achieve a surface roughness requirement of at least CSP-3.

[0065] 2) The area where the floor is constructed must be closed and protected to avoid temperature fluctuations, be oil-free, and have a moisture content below 8%, otherwise the floor system may be damaged.

[0066] 3) Check the temperature of the area where the floor system construction is required. The most suitable temperature for polyurethane construction is 10-25℃.

[0067] 2. Moisture meter test method: base moisture content test

[0068] The moisture content of the concrete base layer is determined using a moisture meter test method, and the moisture content cannot exceed 8%.

[0069] 3. Crack repair (if necessary)

[0070] 1) 1mm to 5mm cracks: Use polyurethane primer and add quartz sand for repair (extending at least 600mm along the length of the crack, or covering all base surfaces).

[0071] 4. Separator setting (separation seam)

[0072] 1) Use separators: If you choose to use separators, you need to install the separators. 2) If you need to have no separators, you can use other separation methods and remove the separators after the color separation paving is completed.

[0073] 5. Construction of special primer for grinding stone

[0074] If a water vapor barrier layer is required, it should be installed before the grinding stone special primer is applied.

[0075] 1) Mixing

[0076] The grindstone-specific primer A (polyurethane resin primer) component (resin) and component B (curing agent) are mixed according to the mass ratio and mixed evenly using a low-speed stirrer and a high-speed mixer.

[0077] Pour the mixed primer onto the ground immediately and use it up within 30 minutes (spread and roll back and forth).

[0078] 2) Construction

[0079] Pour the primer onto a properly prepared concrete base.

[0080] Use a straight-edged trowel or rubber scraper to spread evenly, and use a short-haired roller to roll back and forth, making sure not to allow the primer to accumulate.

[0081] 6. Bio-based polyurethane grinding stone construction

[0082] 1) Mixing:

[0083] The bio-based polyester polyol in component A of the bio-based polyurethane grindstone coating and component B (curing agent) of the bio-based polyurethane grindstone coating were mixed according to a mass ratio and stirred at a low speed for 2 minutes in a drum mixer.

[0084] The defoamer, pigment and quartz powder are slowly added to the elastic polyurethane formed by mixing the above-mentioned bio-based polyester polyol and curing agent, and stirred in a mixer until the filler is completely impregnated with the resin.

[0085] Continue stirring and add the coarse aggregate, resin and ground stone aggregate and continue mixing for 3 to 4 minutes until there are no lumps and a uniform mixture is obtained.

[0086] After thorough mixing, transport the material to the construction site using a wheelbarrow or bucket. Note: The elastic polyurethane masterbatch must be mixed mechanically. The mixer must be thoroughly cleaned between mixing sessions or before adjusting the color of the elastic polyurethane resin mortar. Use alcohol to clean the equipment. If the interval between applications exceeds 40-50 minutes, do not over-mix the material. The application temperature of the elastic polyurethane resin mortar should be between 10-35°C.

[0087] 2) Construction:

[0088] Carry out construction on the base surface after primer treatment and spread the material along a straight line.

[0089] Use a straight-edged trowel to level the aggregate, using the maximum aggregate particle size as the appropriate thickness. Use the trowel to flatten the aggregate. To increase the volume and density of the elastic polyurethane resin mortar, a mechanical trowel can be used for the final troweling. Common finishing machines include four trowels with 91 cm wide blades.

[0090] Ensure that the polyurethane resin mortar is cured for at least 12 to 16 hours (base surface temperature is 21°C)

[0091] 8. Sanding and grouting

[0092] 1) Primary grinding: Use a 24-56 mesh diamond grinding disc for grinding. If the aggregate ratio is 100% glass, use a diamond grinding head for wet grinding and a lightweight grinder for coarse grinding.

[0093] 2) Intermediate grinding: Before filling, use 80 mesh diamond sand or diamond grinding disc for intermediate grinding. Note: The machine should always be in motion, moving parallel to the ground at first, and then moving diagonally across the ground.

[0094] 3) Cleaning: Clean the floor after sanding. Before filling, make sure the floor is clean and dry.

[0095] 4) Grouting: When grouting, elastic polyurethane masterbatch of the same color must be used. After grouting, it can be polished after 18 to 24 hours (the base surface temperature is 24°C).

[0096] 5) Mixing of elastic polyurethane masterbatch for slurry filling

[0097] Each component of the elastic polyurethane masterbatch should be thoroughly stirred before mixing.

[0098] Mix the elastic polyurethane masterbatch component A (main agent) and component B (curing agent) in the appropriate mass ratio and use a low-speed electric stirrer to mix for 3 minutes. Add the bio-based polyurethane millstone filler to the mixed bio-based polyurethane millstone slurry to form a paste suitable for slurrying.

[0099] If the usage time exceeds 30 minutes, the materials should not be stirred too much.

[0100] Use a straight-edged trowel to firmly apply the elastic polyurethane masterbatch mortar to the surface and fill any holes. Allow it to cure overnight before polishing. When filling, sprinkle abrasive filler on the filled surface to help absorb any excess resin.

[0101] Finally, polish with a 120-mesh or higher diamond grinding wheel or resin grinding wheel.

[0102] 9. Seal

[0103] Bio-based polyurethane terrazzo floors should be sealed with a polyurethane terrazzo topcoat or wax. Note: If the polished floor already meets the required functionality and aesthetics, sealing is not necessary. If sealing is required, please consult with the floor contractor.

[0104] 1) Mixing and application

[0105] Stir the liquid in the can thoroughly before use.

[0106] Use a short-nap roller for application. Avoid material buildup. To achieve the desired gloss level consistent with the appearance of the approved sample or panel, two or more coats may be required. If multiple coats are required, allow each coat to dry completely before applying the next. Allow to cure for 24 hours (substrate temperature 24°C).

[0107] The properties of the bio-based polyurethane grindstone floor prepared in this embodiment are shown in Table 2. The physical picture of the bio-based polyurethane grindstone floor prepared in this embodiment is shown in Table 2. Figure 1 shown.

[0108] Table 2 Properties of bio-based polyurethane grindstone floor prepared in Example 1

[0109]

[0110] Example 2

[0111] This embodiment provides a bio-based polyurethane grinding stone coating, including component A and component B; component A includes the following components in percentage by weight:

[0112] The composition includes 72% bio-based polyester polyol (Savymore castor oil-modified polyol produced by BASF), 5% defoamer, 5% pigment, 10% quartz powder (300 mesh), and 8% coarse aggregate (average particle size 5-8mm, marble chips and glass chips). Component B is a curing agent, which is a modified polyisocyanate. The mass ratio of bio-based polyester polyol to modified polyisocyanate is 5:1.

[0113] The preparation method of the bio-based polyurethane grindstone floor provided in this embodiment is the same as that in Example 1.

[0114] Example 3

[0115] This embodiment provides a bio-based polyurethane grinding stone coating, including component A and component B; component A includes the following components in percentage by weight:

[0116] The product comprises 70% bio-based polyester polyol (Savymore castor oil-modified polyol produced by BASF), 5% defoamer, 5% pigment, 10% quartz powder (300 mesh), and 10% coarse aggregate (average particle size 5-8mm, marble chips and glass chips). Component B is a curing agent, which is a modified polyisocyanate. The mass ratio of bio-based polyester polyol to modified polyisocyanate is 5:1.

[0117] The preparation method of the bio-based polyurethane grindstone floor provided in this embodiment is the same as that in Example 1.

[0118] Example 4

[0119] This embodiment provides a bio-based polyurethane grinding stone coating, including component A and component B; component A includes the following components in percentage by weight:

[0120] The composition includes 63% bio-based polyester polyol (Savymo castor oil-modified polyol produced by BASF), 5% defoamer, 5% pigment, 15% quartz powder (300 mesh), and 12% coarse aggregate (average particle size 5-8mm, marble chips and glass chips). Component B is a curing agent, which is a modified polyisocyanate. The mass ratio of bio-based polyester polyol to modified polyisocyanate is 5:1.

[0121] The preparation method of the bio-based polyurethane grindstone floor provided in this embodiment is the same as that in Example 1.

[0122] As can be seen from the above examples, the bio-based polyurethane grinding stone coating provided by the present invention includes component A and component B; component A includes the following components in percentage by weight: 60-80% bio-based polyester polyol, 4-5% defoamer, 4-5% pigment, 7-18% quartz powder, and 5-12% coarse aggregate, wherein the coarse aggregate is marble chips and / or glass; component B is a curing agent, which is a modified polyisocyanate. The present invention uses bio-based polyester polyol as the main component of the polyurethane grinding stone coating, and auxiliary defoamer, pigment, quartz powder filler, and coarse aggregate as auxiliary components. By strictly controlling the mass ratio of the above components, the bio-based polyurethane grinding stone coating obtained has a high solid content. The resulting polyurethane grinding stone floor has excellent crack resistance, weather resistance, durability, and wear resistance. It has a long life cycle, high aesthetics, is seamless, resists concrete cracks, does not require other anti-cracking layers, and is lightweight.

[0123] At the same time, the present invention uses renewable bio-based polyester polyols as bio-based raw materials to replace traditional fossil raw materials. The bio-based polyester polyols are processed and produced using biomass such as soybean oil or castor oil as raw materials. The bio-based content of the bio-based polyester polyols is as high as 65-100%. Therefore, the bio-based polyurethane grindstone coating provided by the present invention meets the national carbon neutrality standards and has the advantages of emission reduction, environmental protection and low cost.

[0124] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A bio-based polyurethane grinding stone coating, characterized in that: A component and a component B, wherein the mass ratio of the component A to the component B is (5-6):1; The A component is composed of the following components in percentage by mass: 60-80% of Savimo castor oil-modified polyol, 4-5% of defoamer, 4-5% of pigment, 7-18% of quartz powder, and 5-12% of coarse aggregate; the coarse aggregate is marble chips and glass, and the average particle size of the coarse aggregate is 5-8 mm; the mesh size of the quartz powder is 300-400 mesh; the defoamer is a silicone defoamer; and the pigment is a polyurethane pigment. The B component is a curing agent, and the curing agent is a modified polyisocyanate. The modified polyisocyanate is purchased from BASF, and the product model is HI100 curing agent.

2. Use of the bio-based polyurethane grindstone coating according to claim 1 in the preparation of polyurethane grindstone floors.

3. A method for preparing a bio-based polyurethane grindstone floor, characterized in that: The following steps are involved: Applying the grindstone primer on the surface of the foundation to obtain a primer-treated foundation; Component A and component B of the bio-based polyurethane grindstone coating according to claim 1 are mixed to obtain a grindstone mixture; the grindstone mixture is coated on the surface of the foundation treated with the primer to obtain a bio-based polyurethane grindstone surface layer, thereby obtaining the bio-based polyurethane grindstone floor.

4. The preparation method according to claim 3, characterized in that The thickness of the bio-based polyurethane grindstone surface layer is 8 to 10 mm.

5. The preparation method according to claim 3 or 4, characterized in that After obtaining the primer-treated foundation and before coating the grindstone mixture, the method further comprises: preparing an elastic polyurethane leveling pad on the surface of the primer-treated foundation, wherein the thickness of the elastic polyurethane leveling pad is 3-5 mm.

6. The preparation method according to claim 3 or 4, characterized in that After obtaining the bio-based polyurethane grindstone surface layer, the method further includes sealing the bio-based polyurethane grindstone surface layer with a covering material to obtain a covering layer, thereby obtaining the bio-based polyurethane grindstone floor.

7. The bio-based polyurethane grindstone floor prepared by the preparation method according to any one of claims 3 to 6.

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