Environment-friendly wear-resistant waterborne polyurethane mortar terrace and preparation method thereof

Abstract

The invention discloses an environment-friendly wear-resistant waterborne polyurethane mortar terrace and a preparation method thereof, and relates to the technical field of waterborne polyurethane mortar terraces. The floor comprises a ground base layer and further comprises a water-based polyurethane mortar layer on the surface of the ground base layer, and the ground base layer is made of concrete. The thickness of the polyurethane mortar layer ranges from 2 mm to 5 mm. The water-based polyurethane mortar layer is prepared from water-based polyurethane mortar prepared from water-based polyurethane emulsion, functional color paste and concrete mortar. The waterborne polyurethane emulsion is prepared from castor oil, hydroxypropyl-terminated polydimethylsiloxane, a 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 gamma-aminoethyl aminopropyl trimethoxy silane. The preparation method comprises the following steps: preparing a waterborne polyurethane emulsion; the concrete mortar is composed of cement, standard sand, modified calcium phosphate microspheres and water.

Description

Technical Field

[0001] The invention relates to the technical field of waterborne polyurethane mortar flooring, and 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 requirements for environmental protection and sustainable development, the construction and flooring materials industry has ushered in profound changes. In the field of flooring materials, polyurethane coatings have long been widely used in floor topcoats due to their excellent gloss and color retention, anti-slip properties, wear resistance and chemical corrosion resistance. However, traditional solvent-based polyurethane materials have high volatile organic compound (VOC) emissions, which not only pollute the environment, but also endanger the health of construction workers, and have gradually failed to meet increasingly stringent environmental regulations and market demands.

[0003] In this context, waterborne polyurethane materials have emerged as a new generation of environmentally friendly floor coatings. Compared with traditional solvent-based materials, waterborne polyurethane materials have the significant advantages of low viscosity, no solvent, low or even close to zero VOC emissions, and excellent construction operability and safety. They are green and environmentally friendly products that the country is currently advocating. Especially in terms of wear resistance, anti-slip and environmental adaptability, waterborne polyurethane materials show great technical potential and can be widely used in industrial floors, commercial floors and places with higher environmental protection requirements (such as food processing plants, pharmaceutical workshops, etc.).

[0004] At present, the technological development of waterborne polyurethane polymer materials has been significantly accelerated. However, since floor materials often face harsh conditions such as heavy loads and high wear in actual applications, it is difficult to meet the performance requirements of some complex scenarios by relying solely on a single waterborne polyurethane coating. Therefore, combining high-performance waterborne polyurethane with mortar materials to develop an environmentally friendly, wear-resistant waterborne polyurethane mortar floor material has become an important direction of current research. This material not only needs to maintain the environmental advantages of waterborne polyurethane, but also should further enhance the wear resistance, impact resistance and bearing capacity of floor materials through the strengthening effect of mortar to meet the diverse needs of industrial, commercial and special-purpose places.

[0005] Waterborne polyurethane mortar flooring materials have great market potential and promotion value. Its application can significantly reduce environmental pollution, comply with national environmental protection laws and regulations, and promote the flooring industry to develop in a green and sustainable direction. The research and development and promotion of this new material can 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: 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 container, heating to 60-65°C and stirring for 1-1.5h under a nitrogen atmosphere, adding isophorone diisocyanate, 2,2-bis(hydroxymethyl)butyric acid, and dibutyltin dilaurate, heating to 78-80°C and reacting for 2-2.5h, and adding 2-(2-hydroxyphenyl)-2H-benzotriazole , arbutin, keep warm for 2-2.5h, add acetone to adjust the viscosity of the reaction system, add sorbitan monooleate, keep warm for 2-2.5h, reduce the temperature of the reaction system to 38-40℃, add triethylamine, keep warm for 20-30min, add deionized water, stir and emulsify, add hydrazine hydrate at 40℃, stir for 30-45min, add γ-aminoethylaminopropyltrimethoxysilane, cool to 20-22℃, react for 1-1.5h, and obtain a waterborne polyurethane emulsion; S2: Add water-based polyurethane emulsion, functional color paste and concrete mortar into a batching tank in turn and mix them 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.

[0008] 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.

[0009] Furthermore, the solid content of the aqueous polyurethane emulsion is 20-35wt%.

[0010] 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 anhydrous ethanol solution of phosphoric acid, reacting at room temperature for 12-14 hours, centrifuging, washing the product with anhydrous ethanol, dispersing the product in anhydrous ethanol, and obtaining a calcium phosphate emulsion.

[0011] 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.

[0012] 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).

[0013] Furthermore, the functional color paste includes any one or more combinations of carbon black, rutile titanium dioxide, red iron oxide, yellow iron oxide, phthalocyanine green, and phthalocyanine blue.

[0014] Furthermore, the raw materials of the concrete mortar include, by weight, 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.

[0015] Furthermore, the preparation method of the modified calcium phosphate microspheres comprises the following steps: Step (1): adding anhydrous calcium chloride to deionized water, stirring evenly, adding diammonium hydrogen phosphate, adding to a 2 mol / L hydrochloric acid solution, stirring until completely dissolved, adjusting the pH to 2-2.5, adding urea and disodium ethylenediaminetetraacetate, sealing, stirring at room temperature for 30-45 minutes, hydrothermally reacting at 100-105° C. for 12-12.5 hours, cooling, collecting the precipitate, washing the precipitate with deionized water and ethanol, and vacuum drying at 60-65° C. to obtain calcium phosphate microspheres; Step (2): adding bis[3-(trimethoxysilyl)propyl]amine to an ethanol aqueous solution in a volume ratio of 1:9, stirring evenly to obtain a mixed solution; hydrolyzing the mixed solution for 6-7 hours, immersing the calcium phosphate microspheres in the solution for 2-3 minutes, taking them out and drying them in an environment of 100-105° C. for 1-1.5 hours, repeating the immersion and taking out operation three times to obtain modified calcium phosphate microspheres.

[0016] Furthermore, in the preparation process of the calcium phosphate microspheres, the mass ratio of anhydrous calcium chloride: diammonium hydrogen phosphate: urea: disodium ethylenediaminetetraacetic acid is 0.88:0.64:2.4:0.1; and the concentration of the mixed solution is 6-7% v / v.

[0017] Furthermore, the thickness of the environmentally friendly wear-resistant water-based polyurethane mortar floor is 2-5 mm.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses arbutin as a crosslinking 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, and finally uses γ-aminoethylaminopropyltrimethoxysilane as a post-chain extender to extend the chain to prepare a waterborne polyurethane emulsion with excellent wear resistance; the introduction of sorbitan monooleate can improve the crosslinking density while giving the waterborne polyurethane emulsion good mechanical properties, water resistance and corrosion resistance, and similarly, the methoxy group in the γ-aminoethylaminopropyltrimethoxysilane structure undergoes hydrolysis and condensation, which promotes the crosslinking of the waterborne polyurethane molecular chain, further improves the crosslinking degree, forms a more uniform crosslinking network, improves the binding force between latex particles, is conducive to the conduction of stress, and reduces the wear quality loss.

[0019] 2. On the basis of the above-mentioned aqueous polyurethane emulsion, the present invention further adds a calcium phosphate emulsion with a nanometer 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 nanometer particle size undergoes organic-inorganic hybrid crosslinking in the aqueous polyurethane network, and is further matched with micrometer-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 crosslinking with the aqueous polyurethane chain segments. At the same time, the porous structure of the modified calcium phosphate microspheres is mechanically engaged with 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

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] 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 other raw materials are commercially available.

[0022] The preparation method of calcium phosphate emulsion comprises the following steps: adding 1.48 g of calcium chloride dihydrate into 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, dispersing the product in anhydrous ethanol, and obtaining calcium phosphate emulsion.

[0023] The concentration of the calcium carbonate emulsion is 15 mg / mL.

[0024] In the following examples, the solid content of the waterborne polyurethane emulsion is 35 wt %, and the thickness of the environmentally friendly wear-resistant waterborne polyurethane mortar floor is 5 mm.

[0025] Example 1: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 1 part of calcium phosphate emulsion are added to a reaction container, heated to 60°C and stirred for 1 hour under a nitrogen atmosphere, 16.9 parts of isophorone diisocyanate, 4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate are added, heated to 78°C for reaction for 2-2.5 hours, and 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole, 1.4 parts of arbutin, keep warm for 2 hours, add acetone to adjust the viscosity of the reaction system, add 0.9 parts of sorbitan monooleate, keep warm for 2-2.5 hours, reduce the temperature of the reaction system to 38°C, add 3.2 parts of triethylamine, keep warm for 20-30 minutes, add deionized water, stir and emulsify, add 1.6 parts of hydrazine hydrate at 40°C, stir for 30-45 minutes, add 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane, cool to 20°C and react for 1 hour to obtain a waterborne polyurethane emulsion; S2: Add 0.88g of anhydrous calcium chloride to deionized water, stir evenly, add 0.64g of diammonium hydrogen phosphate, add to 2mol / L hydrochloric acid solution, stir until completely dissolved, adjust the pH to 2, add 2.4g of urea and 0.1g of disodium ethylenediaminetetraacetate, seal, stir at room temperature for 30min, hydrothermally react at 100℃ for 12h, cool, collect the precipitate, wash the precipitate with deionized water and ethanol, and vacuum dry at 60℃ to obtain calcium phosphate microspheres; S3: Add bis[3-(trimethoxysilyl)propyl]amine to an ethanol-water solution with a volume ratio of 1:9, stir evenly, and obtain a 6% v / v mixed solution; after the mixed solution is hydrolyzed for 6 hours, the calcium phosphate microspheres are immersed in the solution for 2 minutes, taken out and dried in an environment of 100°C for 1 hour, and the immersion and removal operation is repeated three times to obtain modified calcium phosphate microspheres; S4: 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.

[0026] 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.

[0027] Example 2: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 6 parts of calcium phosphate emulsion are added to a reaction container, heated to 60°C and stirred for 1 hour under a nitrogen atmosphere, 16.9 parts of isophorone diisocyanate, 2.4 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate are added, heated to 78°C for reaction for 2-2.5 hours, and 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole, 1.4 parts of arbutin, keep warm for 2 hours, add acetone to adjust the viscosity of the reaction system, add 3.6 parts of sorbitan monooleate, keep warm for 2-2.5 hours, reduce the temperature of the reaction system to 38°C, add 1.6 parts of triethylamine, keep warm for 20-30 minutes, add deionized water, stir and emulsify, add 1.6 parts of hydrazine hydrate at 40°C, stir for 30-45 minutes, add 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane, cool to 20°C and react for 1 hour to obtain a waterborne polyurethane emulsion; The remaining steps are the same as those in Example 1.

[0028] Example 3: A method for preparing an environmentally friendly, wear-resistant water-based polyurethane mortar floor, comprising the following steps: S4: sequentially add 10 parts of water-based polyurethane emulsion, 1 part of functional color paste, and 20 parts of concrete mortar into a batching tank and stir 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.

[0029] 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.

[0030] The remaining steps are the same as those in Example 2.

[0031] Comparative Example 1: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: Add 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 10 parts of calcium phosphate emulsion into a reaction container, heat to 60°C and stir for 1h under a nitrogen atmosphere, add 16.9 parts of isophorone diisocyanate, 4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heat to 78°C and react for 2-2.5h, add 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole, 1.4 parts of arbutin, keep warm for 2 hours, add acetone to adjust the viscosity of the reaction system, add 0.9 parts of sorbitan monooleate, keep warm for 2-2.5 hours, reduce the temperature of the reaction system to 38°C, add 3.2 parts of triethylamine, keep warm for 20-30 minutes, add deionized water, stir and emulsify, add 1.6 parts of hydrazine hydrate at 40°C, stir for 30-45 minutes, add 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane, cool to 20°C and react for 1 hour to obtain a waterborne polyurethane emulsion; The remaining steps are the same as those in Example 1.

[0032] 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 into a reaction container, 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, and obtaining a water-based polyurethane emulsion; The remaining steps are the same as those in Example 1.

[0033] Comparative Example 3: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S2: adding 0.88g of anhydrous calcium chloride to deionized water, stirring evenly, adding 0.64g of diammonium hydrogen phosphate, adding to a 2mol / L hydrochloric acid solution, stirring until completely dissolved, adjusting the pH to 2, adding 2.4g of urea and 0.1g of disodium ethylenediaminetetraacetate, sealing, stirring at room temperature for 30min, hydrothermally reacting in an environment of 100°C for 12h, 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; S3: 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.

[0034] 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; The remaining steps are the same as those in Example 1.

[0035] Comparative Example 4: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: Add 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 1 part of calcium phosphate emulsion into a reaction container, heat to 60°C and stir for 1 hour under a nitrogen atmosphere, add 16.9 parts of isophorone diisocyanate, 4.7 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heat to 78°C and react for 2-2.5 hours, add 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole, 1.4 parts of arbutin, keep warm for 2 hours, add acetone to adjust the viscosity of the reaction system, add 0.9 parts of sorbitan monooleate, keep warm for 2-2.5 hours, reduce the temperature of the reaction system to 38°C, add 3.2 parts of triethylamine, keep warm for 20-30 minutes, add deionized water, stir and emulsify, add 1.6 parts of hydrazine hydrate at 40°C, stir for 30-45 minutes, add 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane, cool to 20°C and react for 1 hour to obtain a waterborne polyurethane emulsion; 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.

[0036] The concrete mortar consists of 450 parts of cement, 1350 parts of standard sand and 225 parts of water.

[0037] Comparative Example 5: A method for preparing an environmentally friendly wear-resistant water-based polyurethane mortar floor, comprising the following steps: S1: Add 20 parts of castor oil, 6 parts of hydroxypropyl-terminated polydimethylsiloxane, and 1 part of calcium phosphate emulsion into a reaction container, heat to 60°C and stir for 1h under a nitrogen atmosphere, add 16.9 parts of isophorone diisocyanate, 1.9 parts of 2,2-bis(hydroxymethyl)butyric acid, and 0.02 parts of dibutyltin dilaurate, heat to 78°C and react for 2-2.5h, add 1.2 parts of 2-(2-hydroxyphenyl)-2H- Benzotriazole, 1.4 parts of arbutin, keep warm for 2 hours, add acetone to adjust the viscosity of the reaction system, add 4.8 parts of sorbitan monooleate, keep warm for 2-2.5 hours, reduce the temperature of the reaction system to 38°C, add 1.2 parts of triethylamine, keep warm for 20-30 minutes, add deionized water, stir and emulsify, add 1.6 parts of hydrazine hydrate at 40°C, stir for 30-45 minutes, add 2.6 parts of γ-aminoethylaminopropyltrimethoxysilane, cool to 20°C and react for 1 hour to obtain a waterborne polyurethane emulsion; The remaining steps are the same as those in Example 1.

[0038] 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".

[0039] The experimental results are shown in Table 1 below.

[0040] Table 1 Environmentally friendly wear-resistant water-based polyurethane mortar floor performance test data table

[0041] Conclusion: The waterborne polyurethane mortar floor prepared by the present invention has excellent wear resistance.

[0042] In Comparative Example 1, too much calcium phosphate emulsion was added, resulting in reduced fluidity and reduced performance of the waterborne polyurethane mortar floor; The waterborne polyurethane in Comparative Example 2 lacks post-chain extension treatment with γ-aminoethylaminopropyltrimethoxysilane, resulting in a decrease in the crosslinking density of the waterborne polyurethane itself, as well as the dispersibility and crosslinking density with the concrete mortar, and a decrease in the performance of the waterborne polyurethane mortar flooring; In Comparative Example 3, ordinary calcium phosphate microspheres were added to the concrete mortar, resulting in reduced dispersibility and cross-linking density, and reduced performance of the waterborne polyurethane mortar floor; 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; In Comparative Example 5, too much sorbitan monooleate was added, resulting in reduced crosslinking density and performance of the waterborne polyurethane mortar floor.

[0043] 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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

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. The ground base material is concrete; the thickness of the 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 of each component in the waterborne polyurethane emulsion include, by weight, 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.

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

3. The environmentally friendly wear-resistant waterborne polyurethane mortar floor according to claim 1 is characterized by: 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.

4. The environmentally friendly wear-resistant waterborne polyurethane mortar floor 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).

5. The environmentally friendly wear-resistant waterborne polyurethane mortar floor according to claim 1 is characterized by: The preparation method of the aqueous 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 should be 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.

6. The environmentally friendly wear-resistant waterborne polyurethane mortar floor according to claim 5 is characterized by: 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 anhydrous ethanol solution of phosphoric acid, reacting at room temperature for 12-14 hours, centrifuging, washing the product with anhydrous ethanol, dispersing the product in anhydrous ethanol, and obtaining the calcium phosphate emulsion.

7. The environmentally friendly wear-resistant waterborne polyurethane mortar floor according to claim 6 is characterized by: In the preparation process of the calcium carbonate emulsion, the mass ratio of calcium chloride dihydrate to phosphoric acid is (1.48-1.6):(0.98-1.02); the concentration of the calcium carbonate emulsion is 15-20 mg / mL.

8. The environmentally friendly wear-resistant waterborne polyurethane mortar floor according to claim 3 is characterized by: The preparation method of the modified calcium phosphate microspheres comprises the following steps: Step (1): adding anhydrous calcium chloride to deionized water, stirring evenly, adding diammonium hydrogen phosphate, adding to a 2 mol / L hydrochloric acid solution, stirring until completely dissolved, adjusting the pH to 2-2.5, adding urea and disodium ethylenediaminetetraacetate, sealing, stirring at room temperature for 30-45 minutes, hydrothermally reacting at 100-105° C. for 12-12.5 hours, cooling, collecting the precipitate, washing the precipitate with deionized water and ethanol, and vacuum drying at 60-65° C. to obtain calcium phosphate microspheres; Step (2): adding bis[3-(trimethoxysilyl)propyl]amine to an ethanol aqueous solution and stirring evenly to obtain a mixed solution; hydrolyzing the mixed solution for 6-7 hours, immersing the calcium phosphate microspheres in the solution for 2-3 minutes, taking them out and drying them in an environment of 100-105° C. for 1-1.5 hours, repeating the immersion and taking out operation three times to obtain modified calcium phosphate microspheres.

9. The environmentally friendly wear-resistant waterborne polyurethane mortar floor according to claim 8 is characterized by: In the preparation process of calcium phosphate microspheres, the mass ratio of anhydrous calcium chloride: diammonium hydrogen phosphate: urea: disodium ethylenediaminetetraacetic acid is 0.88:0.64:2.4:0.1; and the concentration of the mixed solution is 6-7% v / v.

10. A method for preparing an environmentally friendly wear-resistant waterborne polyurethane mortar floor according to any one of claims 1 to 9, comprising the following steps: Add water-based polyurethane emulsion, functional color paste and concrete mortar into a batching tank in turn and mix them evenly to obtain water-based polyurethane mortar; clean and flatten the ground base, 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.

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