Environmentally friendly wear-resistant water-based polyurethane mortar floor and preparation method thereof

Abstract

The present invention discloses an environmentally friendly, wear-resistant water-based polyurethane mortar floor and a preparation method thereof, relating to the technical field of water-based polyurethane mortar floors. The floor comprises a ground base and a water-based polyurethane mortar layer on the surface of the ground base, wherein the ground base is made of concrete; the polyurethane mortar layer has a thickness of 2-5 mm; and the water-based polyurethane mortar layer is obtained by preparing a water-based polyurethane mortar from a water-based polyurethane emulsion, a functional color paste, and concrete mortar. The water-based polyurethane emulsion comprises castor oil, hydroxypropyl-terminated polydimethylsiloxane, calcium phosphate emulsion, isophorone diisocyanate, 2,2-bis(hydroxymethyl)butyric acid, dibutyltin dilaurate, 2-(2-hydroxyphenyl)-2H-benzotriazole, arbutin, sorbitan monooleate, triethylamine, hydrazine hydrate, and γ-aminoethylaminopropyltrimethoxysilane. The concrete mortar comprises cement, standard sand, modified calcium phosphate microspheres, and water.

Description

Technical Field

[0001] The present invention relates to the technical field of waterborne polyurethane mortar flooring, in particular to an environmentally friendly wear-resistant waterborne polyurethane mortar flooring and a preparation method thereof. Background Art

[0002] In recent years, with the increasing global demand for environmental protection and sustainable development, the construction and flooring materials industries have undergone profound changes. Within this field, polyurethane coatings have long been widely used as floor topcoats due to their excellent gloss and color retention, anti-slip properties, abrasion resistance, and chemical resistance. However, traditional solvent-based polyurethane materials, due to their high volatile organic compound (VOC) emissions, not only pollute the environment but also pose a health risk to construction workers. They are gradually failing to meet increasingly stringent environmental regulations and market demands.

[0003] Against this backdrop, waterborne polyurethane materials have emerged as a new generation of environmentally friendly floor coatings. Compared to traditional solvent-based materials, waterborne polyurethane materials offer significant advantages, including low viscosity, lack of solvents, and low or near-zero VOC emissions. They also offer excellent workability and safety, making them a green and environmentally friendly product currently being strongly advocated by the government. Waterborne polyurethane materials demonstrate significant technological potential, particularly in terms of wear resistance, anti-slip properties, and environmental adaptability, making them suitable for widespread application in industrial and commercial flooring, as well as in locations with higher environmental requirements (such as food processing plants and pharmaceutical workshops).

[0004] Currently, the technological development of waterborne polyurethane polymer materials has significantly accelerated. However, due to the harsh conditions that flooring materials often face in actual applications, such as heavy loads and high wear, relying solely on waterborne polyurethane coatings cannot meet the performance requirements of some complex scenarios. Therefore, combining high-performance waterborne polyurethane with mortar materials to develop an environmentally friendly and wear-resistant waterborne polyurethane mortar flooring material has become an important research direction. This material must not only maintain the environmental advantages of waterborne polyurethane, but also further enhance the wear resistance, impact resistance, and load-bearing capacity of the flooring material through the strengthening effect of the mortar to meet the diverse needs of industrial, commercial, and special-purpose sites.

[0005] Waterborne polyurethane mortar flooring materials have significant market potential and promotional value. Their application can significantly reduce environmental pollution, comply with national environmental regulations, and promote the green and sustainable development of the flooring industry. The development and promotion of this new material will not only effectively replace traditional solvent-based flooring materials but also provide important technical support for the green transformation of the construction industry. Summary of the Invention

[0006] The purpose of the present invention is to provide an environmentally friendly wear-resistant water-based polyurethane mortar floor and a preparation method thereof, so as to solve the problems raised in the prior art.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for preparing an environmentally friendly, wear-resistant water-based polyurethane mortar floor, characterized in that it comprises the following steps: S1: adding castor oil, hydroxypropyl-terminated polydimethylsiloxane, and calcium phosphate emulsion into a reaction vessel, heating to 60-65°C and stirring for 1-1.5 hours under a nitrogen atmosphere, adding isophorone diisocyanate, 2,2-bis(hydroxymethyl)butyric acid, and dibutyltin dilaurate, heating to 78-80°C and reacting for 2-2.5 hours, and adding 2-(2-hydroxyphenyl)-2H-benzotriazole , arbutin, keep warm and react for 2-2.5 hours, add acetone to adjust the viscosity of the reaction system, add sorbitan monooleate, keep warm and react for 2-2.5 hours, reduce the temperature of the reaction system to 38-40°C, add triethylamine, keep warm and react for 20-30 minutes, add deionized water, stir and emulsify, add hydrazine hydrate at 40°C, stir for 30-45 minutes, add γ-aminoethylaminopropyltrimethoxysilane, cool to 20-22°C and react for 1-1.5 hours to obtain a waterborne polyurethane emulsion;

[0009] S2: Add water-based polyurethane emulsion, functional color paste and concrete mortar into the batching tank in sequence and mix them evenly to obtain water-based polyurethane mortar; clean and smooth the ground base, and evenly spread the water-based polyurethane mortar on the surface of the ground base to obtain an environmentally friendly and wear-resistant water-based polyurethane mortar floor.

[0010] Furthermore, in the preparation process of the aqueous polyurethane emulsion, the raw materials of each component include, by mass, 18-20 parts of castor oil, 6-8 parts of hydroxypropyl-terminated polydimethylsiloxane, 1-6 parts of calcium phosphate emulsion, 16.9-18 parts of isophorone diisocyanate, 2.4-4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, 0.02-0.03 parts of dibutyltin dilaurate, 1.2-1.4 parts of 2-(2-hydroxyphenyl)-2H-benzotriazole, 1.4-1.6 parts of arbutin, 0.9-3.6 parts of sorbitan monooleate, 1.6-3.2 parts of triethylamine, 1.6-2 parts of hydrazine hydrate, and 2.1-3.2 parts of γ-aminoethylaminopropyltrimethoxysilane.

[0011] Furthermore, the solid content of the aqueous polyurethane emulsion is 20-35wt%.

[0012] Furthermore, the preparation method of the calcium phosphate emulsion comprises the following steps: adding calcium chloride dihydrate to anhydrous ethanol, stirring at room temperature for 30-45 minutes, adding triethylamine, stirring at room temperature for 10-15 minutes, adding an anhydrous ethanol solution of phosphoric acid, reacting at room temperature for 12-14 hours, centrifuging, washing the product with anhydrous ethanol, and dispersing the product in anhydrous ethanol to obtain a calcium phosphate emulsion.

[0013] Furthermore, during the preparation of the calcium carbonate emulsion, the mass ratio of calcium chloride dihydrate to phosphoric acid is (1.48-1.6):(0.98-1.02); and the concentration of the calcium carbonate emulsion is 15-20 mg / mL.

[0014] Furthermore, in the preparation process of the waterborne polyurethane mortar, the mass ratio of the raw materials of each component, waterborne polyurethane emulsion: functional color paste: concrete mortar is (10-12): (1-1.5): (20-30).

[0015] Furthermore, the functional color paste includes any one or more combinations of carbon black, rutile titanium dioxide, iron oxide red, iron oxide yellow, phthalocyanine green, and phthalocyanine blue.

[0016] Furthermore, the raw materials of the concrete mortar include, by mass, 450-500 parts of cement, 1350-1500 parts of standard sand, 0.6075-1.575 parts of modified calcium phosphate microspheres, and 225-250 parts of water.

[0017] Furthermore, the preparation method of the modified calcium phosphate microspheres comprises the following steps:

[0018] Step (1): add anhydrous calcium chloride to deionized water, stir evenly, add diammonium hydrogen phosphate, add to 2 mol / L hydrochloric acid solution, stir until completely dissolved, adjust the pH to 2-2.5, add urea and disodium ethylenediaminetetraacetic acid, seal, stir at room temperature for 30-45 minutes, hydrothermally react in an environment of 100-105°C for 12-12.5 hours, cool, collect the precipitate, wash the precipitate with deionized water and ethanol, and vacuum dry in an environment of 60-65°C to obtain calcium phosphate microspheres;

[0019] Step (2): adding bis[3-(trimethoxysilyl)propyl]amine to an ethanol-water solution in a volume ratio of 1:9 and stirring evenly to obtain a mixed solution; the mixed solution is hydrolyzed for 6-7 hours, and the calcium phosphate microspheres are immersed in the solution for 2-3 minutes. After being removed, the calcium phosphate microspheres are placed in an environment of 100-105°C and dried for 1-1.5 hours. The immersion and removal operation is repeated three times to obtain modified calcium phosphate microspheres.

[0020] Furthermore, during the preparation of the calcium phosphate microspheres, the mass ratio of anhydrous calcium chloride: diammonium hydrogen phosphate: urea: disodium edetate is 0.88:0.64:2.4:0.1; and the concentration of the mixed solution is 6-7% v / v.

[0021] Furthermore, the thickness of the environmentally friendly wear-resistant water-based polyurethane mortar floor is 2-5 mm.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention uses arbutin as a cross-linking agent and benzimidazole as an ultraviolet absorber to prepare a castor oil-based waterborne polyurethane containing a terminal hydroxypropyl polydimethylsiloxane structure through molecular structure design, and introduces a sustainable long aliphatic hydrophobic chain extender sorbitan monooleate. Finally, γ-aminoethylaminopropyltrimethoxysilane is used as a post-chain extender for chain extension to prepare a waterborne polyurethane emulsion with excellent wear resistance. The introduction of sorbitan monooleate can improve the cross-linking density while giving the waterborne polyurethane emulsion good mechanical properties, water resistance and corrosion resistance. Similarly, the methoxy group in the γ-aminoethylaminopropyltrimethoxysilane structure undergoes hydrolysis and condensation, promoting the cross-linking of the waterborne polyurethane molecular chains, further increasing the cross-linking degree, forming a more uniform cross-linked network, and improving the bonding force between latex particles, which is beneficial to the conduction of stress and reduces wear mass loss.

[0024] 2. On the basis of the above-mentioned aqueous polyurethane emulsion, the present invention further adds a calcium phosphate emulsion with a nano-scale particle size to the aqueous polyurethane emulsion, and adds modified calcium phosphate microspheres to the concrete mortar, in order to further improve the wear resistance of the final aqueous polyurethane mortar floor. The calcium phosphate emulsion with a nano-scale particle size undergoes organic-inorganic hybrid cross-linking in the aqueous polyurethane network, and is further combined with micron-sized modified calcium phosphate microspheres to accurately regulate the structure of the macromolecular network at the molecular level. The methoxy groups on the surface of the modified calcium phosphate microspheres can further improve the degree of cross-linking with the aqueous polyurethane chain segments. At the same time, the porous structure of the modified calcium phosphate microspheres is mechanically bonded to the cement mortar and the aqueous polyurethane, and the specific surface area in the cement is increased, thereby improving the mechanical properties of the final aqueous polyurethane mortar floor. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] In the following examples, the specification of hydroxypropyl-terminated polydimethylsiloxane is: Mn=1000 g / mol; the specification of castor oil is: KOH=164 mg / g; and the remaining raw materials are commercially available.

[0027] The preparation method of calcium phosphate emulsion comprises the following steps: adding 1.48 g of calcium chloride dihydrate to anhydrous ethanol, stirring at room temperature for 30 minutes, adding 25 mL of triethylamine, stirring at room temperature for 10 minutes, adding 10 mL of anhydrous ethanol solution containing 0.98 g of phosphoric acid, reacting at room temperature for 12 hours, centrifuging, washing the product with anhydrous ethanol, and dispersing the product in anhydrous ethanol to obtain calcium phosphate emulsion.

[0028] The concentration of the calcium carbonate emulsion is 15 mg / mL.

[0029] In the following examples, the solid content of the aqueous polyurethane emulsion is 35 wt %, and the thickness of the environmentally friendly wear-resistant aqueous polyurethane mortar floor is 5 mm.

[0030] Example 1: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: adding 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 1 part of calcium phosphate emulsion to a reaction vessel, heating to 60°C and stirring for 1 hour under a nitrogen atmosphere, adding 16.9 parts of isophorone diisocyanate, 4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heating to 78°C and reacting for 2-2.5 hours, adding 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole and 1.4 parts of arbutin were heated for 2 hours, acetone was added to adjust the viscosity of the reaction system, 0.9 parts of sorbitan monooleate was added, the reaction was heated for 2-2.5 hours, the temperature of the reaction system was lowered to 38°C, 3.2 parts of triethylamine was added, the reaction was heated for 20-30 minutes, deionized water was added, and the mixture was stirred and emulsified. 1.6 parts of hydrazine hydrate was added at 40°C, the mixture was stirred for 30-45 minutes, 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane was added, the temperature was lowered to 20°C, and the reaction was carried out for 1 hour to obtain a waterborne polyurethane emulsion.

[0031] S2: Add 0.88 g of anhydrous calcium chloride to deionized water and stir evenly. Add 0.64 g of diammonium hydrogen phosphate and add to 2 mol / L hydrochloric acid solution and stir until completely dissolved. Adjust the pH to 2. Add 2.4 g of urea and 0.1 g of disodium ethylenediaminetetraacetate. Seal the container and stir at room temperature for 30 min. Hydrothermal reaction is carried out at 100 °C for 12 h. Cool the container and collect the precipitate. Wash the precipitate with deionized water and ethanol and dry it in vacuum at 60 °C to obtain calcium phosphate microspheres.

[0032] S3: Add bis[3-(trimethoxysilyl)propyl]amine to an ethanol-water solution at a volume ratio of 1:9 and stir evenly to obtain a 6% v / v mixed solution; hydrolyze the mixed solution for 6 hours, immerse the calcium phosphate microspheres in the solution for 2 minutes, remove them, and dry them at 100°C for 1 hour. Repeat the immersion and removal operation three times to obtain modified calcium phosphate microspheres;

[0033] S4: Add 10 parts of water-based polyurethane emulsion, 1 part of functional color paste, and 20 parts of concrete mortar into the batching tank in sequence and mix evenly to obtain water-based polyurethane mortar; clean and flatten the ground base, and evenly spread the water-based polyurethane mortar on the surface of the ground base to obtain an environmentally friendly and wear-resistant water-based polyurethane mortar floor.

[0034] The concrete mortar consists of 450 parts of cement, 1350 parts of standard sand, 0.6075 parts of modified calcium phosphate microspheres, and 225 parts of water.

[0035] Example 2: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: adding 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 6 parts of calcium phosphate emulsion to a reaction vessel, heating to 60°C and stirring for 1 hour under a nitrogen atmosphere, adding 16.9 parts of isophorone diisocyanate, 2.4 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heating to 78°C and reacting for 2-2.5 hours, and adding 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole and 1.4 parts of arbutin were heated for 2 hours, acetone was added to adjust the viscosity of the reaction system, 3.6 parts of sorbitan monooleate were added, the reaction was heated for 2-2.5 hours, the temperature of the reaction system was lowered to 38°C, 1.6 parts of triethylamine were added, the reaction was heated for 20-30 minutes, deionized water was added, and the mixture was stirred and emulsified. 1.6 parts of hydrazine hydrate was added at 40°C, the mixture was stirred for 30-45 minutes, 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane were added, the temperature was lowered to 20°C, and the reaction was carried out for 1 hour to obtain a waterborne polyurethane emulsion;

[0036] The remaining steps are the same as those in Example 1.

[0037] Example 3: A method for preparing an environmentally friendly, wear-resistant water-based polyurethane mortar floor, comprising the following steps: S4: adding 10 parts of water-based polyurethane emulsion, 1 part of functional color paste, and 20 parts of concrete mortar into a batching tank in sequence and stirring evenly to obtain water-based polyurethane mortar; cleaning and flattening the ground base, and evenly spreading the water-based polyurethane mortar on the surface of the ground base to obtain an environmentally friendly, wear-resistant water-based polyurethane mortar floor.

[0038] The concrete mortar consists of 450 parts of cement, 1350 parts of standard sand, 1.4175 parts of modified calcium phosphate microspheres, and 225 parts of water.

[0039] The remaining steps are the same as those in Example 2.

[0040] Comparative Example 1: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: adding 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 10 parts of calcium phosphate emulsion to a reaction vessel, heating to 60°C and stirring for 1 hour under a nitrogen atmosphere, adding 16.9 parts of isophorone diisocyanate, 4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heating to 78°C and reacting for 2-2.5 hours, and adding 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole and 1.4 parts of arbutin were heated for 2 hours, acetone was added to adjust the viscosity of the reaction system, 0.9 parts of sorbitan monooleate was added, the reaction was heated for 2-2.5 hours, the temperature of the reaction system was lowered to 38°C, 3.2 parts of triethylamine was added, the reaction was heated for 20-30 minutes, deionized water was added, and the mixture was stirred and emulsified. 1.6 parts of hydrazine hydrate was added at 40°C, the mixture was stirred for 30-45 minutes, 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane was added, the temperature was lowered to 20°C, and the reaction was carried out for 1 hour to obtain a waterborne polyurethane emulsion.

[0041] The remaining steps are the same as those in Example 1.

[0042] Comparative Example 2: A method for preparing an environmentally friendly, wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: adding 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 1 part of calcium phosphate emulsion to a reaction vessel, heating to 60°C and stirring for 1 hour under a nitrogen atmosphere, adding 16.9 parts of isophorone diisocyanate, 4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heating to 78°C and reacting for 2-2.5 hours, adding 1.2 parts of 2-(2-hydroxyphenyl)-2H-benzotriazole and 1.4 parts of arbutin, keeping the temperature for reaction for 2 hours, adding acetone to adjust the viscosity of the reaction system, adding 0.9 parts of sorbitan monooleate, keeping the temperature for reaction for 2-2.5 hours, lowering the temperature of the reaction system to 38°C, adding 3.2 parts of triethylamine, keeping the temperature for reaction for 20-30 minutes, adding deionized water, stirring and emulsifying to obtain a water-based polyurethane emulsion;

[0043] The remaining steps are the same as those in Example 1.

[0044] Comparative Example 3: A method for preparing an environmentally friendly, wear-resistant, water-based polyurethane mortar floor, comprising the following steps: S2: adding 0.88 g of anhydrous calcium chloride to deionized water, stirring evenly, adding 0.64 g of diammonium hydrogen phosphate, adding to a 2 mol / L hydrochloric acid solution, stirring until completely dissolved, adjusting the pH to 2, adding 2.4 g of urea and 0.1 g of disodium ethylenediaminetetraacetic acid, sealing, stirring at room temperature for 30 min, hydrothermally reacting in an environment of 100° C. for 12 h, cooling, collecting the precipitate, washing the precipitate with deionized water and ethanol, and vacuum drying in an environment of 60° C. to obtain calcium phosphate microspheres;

[0045] S3: Add 10 parts of water-based polyurethane emulsion, 1 part of functional color paste, and 20 parts of concrete mortar into the batching tank in sequence and mix evenly to obtain water-based polyurethane mortar; clean and flatten the ground base, and evenly spread the water-based polyurethane mortar on the surface of the ground base to obtain an environmentally friendly and wear-resistant water-based polyurethane mortar floor.

[0046] The concrete mortar is composed of 450 parts of cement, 1350 parts of standard sand, 0.6075 parts of calcium phosphate microspheres, and 225 parts of water;

[0047] The remaining steps are the same as those in Example 1.

[0048] Comparative Example 4: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: adding 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 1 part of calcium phosphate emulsion to a reaction vessel, heating to 60°C and stirring for 1 hour under a nitrogen atmosphere, adding 16.9 parts of isophorone diisocyanate, 4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heating to 78°C and reacting for 2-2.5 hours, adding 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole and 1.4 parts of arbutin were heated for 2 hours, acetone was added to adjust the viscosity of the reaction system, 0.9 parts of sorbitan monooleate was added, the reaction was heated for 2-2.5 hours, the temperature of the reaction system was lowered to 38°C, 3.2 parts of triethylamine was added, the reaction was heated for 20-30 minutes, deionized water was added, and the mixture was stirred and emulsified. 1.6 parts of hydrazine hydrate was added at 40°C, the mixture was stirred for 30-45 minutes, 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane was added, the temperature was lowered to 20°C, and the reaction was carried out for 1 hour to obtain a waterborne polyurethane emulsion.

[0049] S2: Add 10 parts of water-based polyurethane emulsion, 1 part of functional color paste, and 20 parts of concrete mortar into a batching tank in sequence and mix evenly to obtain water-based polyurethane mortar; clean and flatten the ground base, and evenly spread the water-based polyurethane mortar on the surface of the ground base to obtain an environmentally friendly, wear-resistant water-based polyurethane mortar floor.

[0050] The concrete mortar consists of 450 parts of cement, 1350 parts of standard sand and 225 parts of water.

[0051] Comparative Example 5: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: adding 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 1 part of calcium phosphate emulsion to a reaction vessel, heating to 60°C and stirring for 1 hour under a nitrogen atmosphere, adding 16.9 parts of isophorone diisocyanate, 1.9 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heating to 78°C and reacting for 2-2.5 hours, adding 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole and 1.4 parts of arbutin were reacted at this temperature for 2 hours, acetone was added to adjust the viscosity of the reaction system, 4.8 parts of sorbitan monooleate were added, the reaction was reacted at this temperature for 2-2.5 hours, the temperature of the reaction system was lowered to 38°C, 1.2 parts of triethylamine were added, the reaction was reacted at this temperature for 20-30 minutes, deionized water was added, and the mixture was stirred and emulsified, 1.6 parts of hydrazine hydrate was added at 40°C, the mixture was stirred for 30-45 minutes, 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane were added, the temperature was lowered to 20°C, and the reaction was carried out for 1 hour to obtain a waterborne polyurethane emulsion;

[0052] The remaining steps are the same as those in Example 1.

[0053] Experiment: The environmentally friendly wear-resistant water-based polyurethane mortar floors prepared in Examples 1-3 and Comparative Examples 1-5 were tested in accordance with GB / T 22374-2018 "Floor Coating Materials".

[0054] The experimental results are shown in Table 1 below.

[0055] Table 1 Performance test data of environmentally friendly wear-resistant water-based polyurethane mortar floor

[0056]

[0057] Conclusion: The waterborne polyurethane mortar floor prepared by the present invention has excellent wear resistance.

[0058] In Comparative Example 1, too much calcium phosphate emulsion was added, resulting in reduced fluidity and reduced performance of the waterborne polyurethane mortar floor;

[0059] The waterborne polyurethane in Comparative Example 2 lacks post-chain extension treatment with γ-aminoethylaminopropyltrimethoxysilane, resulting in reduced crosslinking density of the waterborne polyurethane itself, as well as its dispersibility and crosslinking density with concrete mortar, and reduced performance of the waterborne polyurethane mortar flooring;

[0060] In Comparative Example 3, the addition of ordinary calcium phosphate microspheres to the concrete mortar resulted in reduced dispersibility and cross-linking density, and reduced performance of the waterborne polyurethane mortar flooring;

[0061] In Comparative Example 4, no modified calcium phosphate microspheres were added to the concrete mortar, resulting in reduced performance of the waterborne polyurethane mortar floor;

[0062] In Comparative Example 5, too much sorbitan monooleate was added, resulting in reduced cross-linking density and performance of the waterborne polyurethane mortar floor.

[0063] 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 embodied 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 illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. An environmentally friendly, wear-resistant water-based polyurethane mortar floor, characterized by: It includes a ground base and a water-based polyurethane mortar layer on the surface of the ground base, wherein the ground base material is concrete; the thickness of the water-based polyurethane mortar layer is 2-5 mm; The waterborne polyurethane mortar layer is obtained from a waterborne polyurethane mortar prepared from a waterborne polyurethane emulsion, a functional color paste, and concrete mortar. The raw materials in the waterborne polyurethane emulsion include, by mass, 18-20 parts of castor oil, 6-8 parts of hydroxypropyl-terminated polydimethylsiloxane, 1-6 parts of calcium phosphate emulsion, 16.9-18 parts of isophorone diisocyanate, 2.4-4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, 0.02-0.03 parts of dibutyltin dilaurate, 1.2-1.4 parts of 2-(2-hydroxyphenyl)-2H-benzotriazole, 1.4-1.6 parts of arbutin, 0.9-3.6 parts of sorbitan monooleate, 1.6-3.2 parts of triethylamine, 1.6-2 parts of hydrazine hydrate, and 2.1-3.2 parts of γ-aminoethylaminopropyltrimethoxysilane. The raw materials of the concrete mortar include, by weight, 450-500 parts of cement, 1350-1500 parts of standard sand, 0.6075-1.0125 parts of modified calcium phosphate microspheres, and 225-250 parts of water. The preparation method of the calcium phosphate emulsion comprises the following steps: adding calcium chloride dihydrate to anhydrous ethanol, stirring at room temperature for 30-45 minutes, adding triethylamine, stirring at room temperature for 10-15 minutes, adding an anhydrous ethanol solution of phosphoric acid, reacting at room temperature for 12-14 hours, centrifuging, washing the product with anhydrous ethanol, and dispersing the product in anhydrous ethanol to obtain the calcium phosphate emulsion; The preparation method of the modified calcium phosphate microspheres comprises the following steps: Step (1): add anhydrous calcium chloride to deionized water, stir evenly, add diammonium hydrogen phosphate, add to 2 mol / L hydrochloric acid solution, stir until completely dissolved, adjust the pH to 2-2.5, add urea and disodium ethylenediaminetetraacetic acid, seal, stir at room temperature for 30-45 minutes, hydrothermally react in an environment of 100-105°C for 12-12.5 hours, cool, collect the precipitate, wash the precipitate with deionized water and ethanol, and vacuum dry in an environment of 60-65°C to obtain calcium phosphate microspheres; Step (2): Add bis[3-(trimethoxysilyl)propyl]amine to an ethanol aqueous solution and stir evenly to obtain a mixed solution; the mixed solution is hydrolyzed for 6-7 hours, and the calcium phosphate microspheres are immersed in the solution for 2-3 minutes. After being taken out, the microspheres are placed in an environment of 100-105°C and dried for 1-1.5 hours. The immersion and removal operation is repeated three times to obtain modified calcium phosphate microspheres.

2. The environmentally friendly, wear-resistant waterborne polyurethane mortar flooring according to claim 1, characterized in that: The functional color paste includes any one or more combinations of carbon black, rutile titanium dioxide, iron oxide red, iron oxide yellow, phthalocyanine green, and phthalocyanine blue.

3. The environmentally friendly, wear-resistant waterborne polyurethane mortar flooring according to claim 1 is characterized by: In the waterborne polyurethane mortar, the mass ratio of the raw materials of each component, waterborne polyurethane emulsion: functional color paste: concrete mortar, is (10-12): (1-1.5): (20-30).

4. The environmentally friendly, wear-resistant waterborne polyurethane mortar flooring according to claim 1 is characterized by: The preparation method of the water-based polyurethane emulsion comprises the following steps: adding castor oil, hydroxypropyl-terminated polydimethylsiloxane, and calcium phosphate emulsion into a reaction container, heating to 60-65° C. and stirring for 1-1.5 hours under a nitrogen atmosphere, adding isophorone diisocyanate, 2,2-bis(hydroxymethyl)butyric acid, and dibutyltin dilaurate, heating to 78-80° C. and reacting for 2-2.5 hours, adding 2-(2-hydroxyphenyl)-2H-benzotriazole and arbutin, and keeping the temperature for reaction. The reaction mixture was stirred for 2-2.5 hours, acetone was added to adjust the viscosity of the reaction system, sorbitan monooleate was added, and the reaction was kept warm for 2-2.5 hours. The temperature of the reaction system was lowered to 38-40°C, triethylamine was added, and the reaction was kept warm for 20-30 minutes. Deionized water was added and stirred for emulsification. Hydrazine hydrate was added at 40°C and stirred for 30-45 minutes. γ-aminoethylaminopropyltrimethoxysilane was added, the temperature was lowered to 20-22°C and the reaction was carried out for 1-1.5 hours to obtain a waterborne polyurethane emulsion.

5. The environmentally friendly, wear-resistant waterborne polyurethane mortar flooring according to claim 1 is characterized by: During the preparation of the calcium phosphate emulsion, the mass ratio of calcium chloride dihydrate to phosphoric acid is (1.48-1.6):(0.98-1.02); and the concentration of the calcium phosphate emulsion is 15-20 mg / mL.

6. The environmentally friendly, wear-resistant waterborne polyurethane mortar flooring according to claim 1 is characterized by: During the preparation of calcium phosphate microspheres, the mass ratio of anhydrous calcium chloride: diammonium hydrogen phosphate: urea: disodium edetate is 0.88:0.64:2.4:0.1; and the concentration of the mixed solution is 6-7% v / v.

7. A method for preparing an environmentally friendly, wear-resistant waterborne polyurethane mortar floor according to any one of claims 1 to 6, comprising the following steps: Add water-based polyurethane emulsion, functional color paste and concrete mortar into the batching tank in sequence and mix them evenly to obtain water-based polyurethane mortar; clean and smooth the ground base, and evenly spread the water-based polyurethane mortar on the surface of the ground base to obtain an environmentally friendly and wear-resistant water-based polyurethane mortar floor.

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