Anti-cracking floor paint with hyperbranched structure and preparation method of anti-cracking floor paint

Abstract

The invention provides anti-cracking floor paint with a hyperbranched structure and a preparation method of the anti-cracking floor paint, and belongs to the technical field of floor paint. According to the invention, polytetrahydrofuran ether glycol reacts with 4, 4 '-methylene bis (phenyl isocyanate) to generate a polyurethane prepolymer, so that the material is endowed with excellent elasticity, strength and chemical stability; the phosphorus-nitrogen co-modified hyperbranched polyol and a matrix form a high cross-linked network through a polyfunctional group and a hyperbranched structure, so that the crack resistance and the flame retardance are improved; sulfydryl-terminated functional polyether participates in crosslinking through high reaction activity of sulfydryl, network uniformity is optimized, and flexibility is enhanced; the modified calcium carbonate filler improves interface bonding, improves mechanical properties and inhibits crack propagation; the glass fiber provides high-strength enhancement, the polypropylene fiber is toughened and relieves stress concentration, and the glass fiber and the polypropylene fiber cooperate to realize a rigid-flexible complementary anti-cracking effect; all the components form a synergistic effect, so that the floor paint is excellent in mechanical property, crack resistance and durability.

Description

Technical Field

[0001] This invention belongs to the field of floor coating technology, and relates to a hyperbranched anti-cracking floor coating and its preparation method. Background Technology

[0002] Epoxy floor coatings, as an important type of architectural coating, are widely used in industrial plants, parking lots, commercial spaces, and residences, and their importance cannot be underestimated. This type of coating not only provides decorative effects, adding aesthetic appeal and personalization to various locations, but also offers essential protection against wear, chemical corrosion, and other environmental factors. The main functions of epoxy floor coatings include improving the wear resistance, slip resistance, and stain resistance of the floor, ensuring safety and durability during use. Therefore, epoxy floor coatings occupy an important position in modern architecture and have become an indispensable part of the building materials field.

[0003] While existing floor coatings perform well in various applications, they still have some shortcomings in terms of performance. First, many traditional floor coatings use linear polymers as their main component. This design makes them prone to cracking and peeling when subjected to external forces or temperature changes, affecting the overall aesthetics of the floor and reducing its lifespan, while increasing maintenance and repair costs. Second, in industrial environments, floors often need to withstand the impact and pressure of heavy machinery; however, the impact resistance of existing floor coatings is often insufficient, making them prone to damage under high-load conditions. This deficiency directly limits the application of floor coatings in heavy-duty environments, resulting in a double loss of functionality and economic benefits. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a hyperbranched, crack-resistant floor coating and its preparation method. This application utilizes the reaction of polytetrahydrofuran ether diol with 4,4'-methylene bis(phenyl isocyanate) to generate a polyurethane prepolymer. Its flexible backbone and rigid aromatic rings endow the material with excellent elasticity, low-temperature resistance, mechanical strength, and chemical stability, providing a solid performance foundation for the system. Phosphorus and nitrogen co-modified hyperbranched polyols, through their multifunctional groups and hyperbranched structure, form a highly crosslinked three-dimensional network with the matrix, significantly improving crack resistance. Simultaneously, the introduced phosphorus and nitrogen elements impart excellent flame retardancy and heat resistance to the system. Thiol-terminated functionalized polyethers utilize the high reactivity of thiol groups to undergo crosslinking reactions with the matrix, forming structures such as thiourea bonds, and their flexible segments optimize the uniformity and flexibility of the crosslinked network. Titanate coupling agents modify calcium carbonate fillers, enhancing the mechanical properties of the material and effectively inhibiting crack propagation by improving the inorganic-organic interface bonding. After surface modification, the interfacial bonding strength between glass fiber and polypropylene fiber is significantly improved. Glass fiber provides high-strength reinforcement, while polypropylene fiber alleviates stress concentration through flexibility and toughening. The two achieve a complementary crack-resistant effect. The components in the system work synergistically, giving the floor coating excellent overall performance in terms of mechanical properties, durability, and crack resistance.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a method for preparing a hyperbranched, crack-resistant floor coating, the method comprising:

[0007] S1: Polytetrahydrofuran ether diol and 4,4'-methylene bis(phenyl isocyanate) are reacted at a constant temperature to obtain reaction solution A. After filtering out impurities, a polyurethane prepolymer is obtained.

[0008] S2: Pentaerythritol, di(methacryloyloxyethyl) hydrogen phosphate, and trimethylolpropane are mixed, and tetrabutyl titanate is added to react with p-methoxyphenol to obtain reaction solution C. After cooling, diethanolamine is added to react to obtain reaction solution D. n-Butanol is added, and after cooling to room temperature, the mixture is filtered to obtain phosphorus and nitrogen co-modified hyperbranched polyol.

[0009] S3: Methyl mercaptoacetate, diethylazodicarboxylate, and triphenylphosphine are dispersed in tetrahydrofuran to obtain solution E; polypropylene glycol and 2,6-di-tert-butyl-p-cresol are mixed and then added dropwise to solution E to obtain reaction solution F. The reaction is carried out at room temperature and post-treatment is performed to obtain thiol-terminated functionalized polyether.

[0010] S4: Calcium carbonate is dispersed in anhydrous ethanol to obtain the first slurry; an ethanol solution of titanate coupling agent KR-TTS is added to obtain a mixed slurry, which is then stirred, rotary evaporated, dried, and sieved to obtain the modified filler.

[0011] S5: Glass fiber is immersed in an ethanol solution of 3-aminopropyltriethoxysilane, filtered, and dried to obtain pretreated glass fiber; polypropylene fiber is subjected to plasma treatment to obtain pretreated polypropylene fiber.

[0012] S6: The polyurethane prepolymer is mixed with phosphorus and nitrogen co-modified hyperbranched polyol and end-thiol functionalized polyether to obtain the first mixed paint. After adding the modified filler, the mixture is stirred to obtain the second mixed paint. The pretreated glass fiber and pretreated polypropylene fiber are mixed with the polyurethane prepolymer to obtain the premixed fiber. The fiber is added to the second mixed paint and stirred to obtain the third mixed paint. 1,4-diazabicyclo[2.2.2]octane, defoamer and leveling agent are added and dispersed evenly. After vacuum defoaming, the hyperbranched anti-cracking floor paint is obtained.

[0013] Specifically, S1: Under a nitrogen atmosphere, polytetrahydrofuran ether diol is heated and 4,4'-methylene bis(phenyl isocyanate) is added in batches. The reaction is maintained at the temperature to obtain reaction solution A. After filtering out impurities, a polyurethane prepolymer is obtained.

[0014] S2: Pentaerythritol, di(methacryloyloxyethyl) hydrogen phosphate, and trimethylolpropane were mixed and heated under a nitrogen atmosphere. Tetrabutyl titanate and p-methoxyphenol were added to obtain reaction solution B. The reaction was carried out to obtain reaction solution C. After cooling, diethanolamine was added dropwise and the reaction was continued to obtain reaction solution D. n-Butanol was added, and after cooling to room temperature, the mixture was filtered to obtain phosphorus and nitrogen co-modified hyperbranched polyol.

[0015] S3: Methyl mercaptoacetate, diethylazodicarboxylate, and triphenylphosphine are dispersed in tetrahydrofuran to obtain solution E; polypropylene glycol (Mn=1000) and 2,6-di-tert-butyl-p-cresol are mixed under a nitrogen atmosphere, and solution E is added dropwise to obtain reaction solution F. The reaction is carried out at room temperature, filtered, and distilled under reduced pressure to obtain thiol-terminated functionalized polyether.

[0016] S4: Calcium carbonate is dispersed in anhydrous ethanol to obtain the first slurry; an ethanol solution of titanate coupling agent KR-TTS is added to obtain a mixed slurry, which is then stirred, rotary evaporated, dried, and sieved to obtain the modified filler.

[0017] S5: Glass fiber is immersed in an ethanol solution of 3-aminopropyltriethoxysilane, filtered, and dried to obtain pretreated glass fiber; polypropylene fiber is subjected to plasma treatment to obtain pretreated polypropylene fiber.

[0018] S6: The polyurethane prepolymer is mixed with phosphorus and nitrogen co-modified hyperbranched polyol and end-thiol functionalized polyether to obtain the first mixed paint. Modified filler is added in batches and stirred to obtain the second mixed paint. Pretreated glass fiber and pretreated polypropylene fiber are mixed with polyurethane prepolymer to obtain premixed fiber. This fiber is added to the second mixed paint and stirred to obtain the third mixed paint. 1,4-diazabicyclo[2.2.2]octane, defoamer and leveling agent are added and dispersed evenly. Vacuum defoaming is then performed to obtain the hyperbranched anti-cracking floor paint.

[0019] As a preferred technical solution of the present invention, in step S1, the polytetrahydrofuran ether diol is heated to 80-85°C, for example, it can be 80°C, 80.5°C, 81°C, 81.5°C, 82°C, 82.5°C, 83°C, 83.5°C, 84°C, 84.5°C or 85°C, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0020] In some alternative embodiments, the mass ratio of the polytetrahydrofuran ether diol to 4,4'-methylene bis(phenyl isocyanate) is 1:(0.35-0.4), for example, it can be 1:0.35, 1:0.36, 1:0.37, 1:0.38, 1:0.39 or 1:0.4, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0021] In some optional embodiments, after the polytetrahydrofuran ether diol is heated, 4,4'-methylenebis(phenyl isocyanate) is added and the reaction is maintained at this temperature for 2-4 hours, for example, 2 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours, 3 hours, 3.2 hours, 3.4 hours, 3.6 hours, 3.8 hours, or 4 hours, but not limited to such values. Values ​​not mentioned within this range are also applicable.

[0022] As a preferred technical solution of the present invention, in step S2, the mass ratio of pentaerythritol, di(methacryloyloxyethyl) hydrogen phosphate, and trimethylolpropane is (80-85):(200-210):(10-15);

[0023] In some optional embodiments, the pentaerythritol, di(methacryloyloxyethyl) hydrogen phosphate, and trimethylolpropane are mixed and heated to 80-100°C, for example, 80°C, 82°C, 84°C, 86°C, 88°C, 90°C, 92°C, 94°C, 96°C, 98°C, or 100°C, but are not limited to such values, and values ​​not mentioned in this range are also applicable.

[0024] The mass ratio of pentaerythritol, tetrabutyl titanate, and p-methoxyphenol is (80-85):(2-3):(0.1-0.3).

[0025] In some alternative embodiments, reaction solution B reacts for 4-6 hours to obtain reaction solution C, for example, 4 hours, 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours, 5 hours, 5.2 hours, 5.4 hours, 5.6 hours, 5.8 hours, or 6 hours, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0026] In some optional embodiments, diethanolamine is added after the reaction solution C is cooled to 40-50°C, for example, 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C or 50°C, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0027] The mass ratio of pentaerythritol to diethanolamine is (80-85):(100-110);

[0028] In some optional embodiments, after the reaction solution C is cooled, diethanolamine is added and the reaction continues for 2-3 hours to obtain reaction solution D. For example, it can be 2 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours, or 3 hours, but it is not limited to such values. Values ​​not mentioned in this range are also applicable.

[0029] The mass ratio of pentaerythritol to n-butanol is (80-85):(30-40);

[0030] As a preferred technical solution of the present invention, in step S3, the mass ratio of polypropylene glycol, methyl mercaptoacetate, diethylazodicarboxylate, and triphenylphosphine is (60-65):(7-8):(10-11):(15-16).

[0031] The mass ratio of polypropylene glycol to tetrahydrofuran and 2,6-di-tert-butyl-p-cresol is (60-65):(200-220):(0.1-0.2);

[0032] In some optional embodiments, the reaction time of the reaction solution F at room temperature is 5-6 hours, for example, 5 hours, 5.1 hours, 5.2 hours, 5.3 hours, 5.4 hours, 5.5 hours, 5.6 hours, 5.7 hours, 5.8 hours, 5.9 hours or 6 hours, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0033] As a preferred technical solution of the present invention, in step S4, the amount of titanate coupling agent KR-TTS added is 1-2% of the mass of calcium carbonate, for example, it can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9% or 2%, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0034] In some alternative embodiments, the mixing temperature of the slurry is 40-50°C, for example, 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C or 50°C, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0035] In some alternative embodiments, the mixing time of the slurry is 40-60 min, for example, 40 min, 42 min, 44 min, 46 min, 48 min, 50 min, 52 min, 54 min, 56 min, 58 min or 60 min, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0036] In some alternative embodiments, the particle size of the modified filler is 8-12 μm, for example, it can be 8 μm, 8.4 μm, 8.8 μm, 9.2 μm, 9.6 μm, 10 μm, 10.4 μm, 10.8 μm, 11.2 μm, 11.6 μm or 12 μm, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0037] As a preferred embodiment of the present invention, in step S5, the mass fraction of the ethanol solution of 3-aminopropyltriethoxysilane is 1-2 wt.%, for example, it can be 1 wt.%, 1.1 wt.%, 1.2 wt.%, 1.3 wt.%, 1.4 wt.%, 1.5 wt.%, 1.6 wt.%, 1.7 wt.%, 1.8 wt.%, 1.9 wt.%, or 2 wt.%, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0038] In some alternative embodiments, the amount of 3-aminopropyltriethoxysilane fed is 4-5% of the glass fiber mass, for example, it can be 4%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9% or 5%, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0039] In some alternative embodiments, the power of the polypropylene fiber plasma treatment is 300-400W, for example, 300W, 320W, 340W, 360W, 380W or 400W, but is not limited to such values, and values ​​not mentioned in this range also apply.

[0040] In some optional embodiments, the plasma treatment time of the polypropylene fibers is 80-90s, for example, 80s, 81s, 82s, 83s, 84s, 85s, 86s, 87s, 88s, 89s or 90s, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0041] As a preferred technical solution of the present invention, in step S6, the mass ratio of polyurethane prepolymer to phosphorus-nitrogen co-modified hyperbranched polyol and end-thiol functionalized polyether in the first mixed paint is (80-85):(8-12):(3-6).

[0042] In some optional embodiments, the polyurethane prepolymer in the first mixed paint is mixed and stirred with phosphorus and nitrogen co-modified hyperbranched polyol and terminal thiol functionalized polyether for 5-10 min, for example, 5 min, 5.5 min, 6 min, 6.5 min, 7 min, 7.5 min, 8 min, 8.5 min, 9 min, 9.5 min or 10 min, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0043] The mass ratio of polyurethane prepolymer to modified filler in the second mixed paint is (80-85):(10-20);

[0044] In some optional embodiments, the stirring speed after adding the modified filler to the first mixed paint is 400-600 rpm, for example, 400 rpm, 420 rpm, 440 rpm, 460 rpm, 480 rpm, 500 rpm, 520 rpm, 540 rpm, 560 rpm, 580 rpm or 600 rpm, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0045] In some optional embodiments, the stirring time after adding the modified filler to the first mixed paint is 5-10 min, for example, it can be 5 min, 5.5 min, 6 min, 6.5 min, 7 min, 7.5 min, 8 min, 8.5 min, 9 min, 9.5 min or 10 min, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0046] The mass ratio of pretreated glass fiber, pretreated polypropylene fiber, and polyurethane prepolymer in the premixed fiber is (1-2):(1-2):20;

[0047] In some optional embodiments, the premixed fiber is added to the second mixed paint and stirred at a speed of 100-200 rpm, for example, 100 rpm, 110 rpm, 120 rpm, 130 rpm, 140 rpm, 150 rpm, 160 rpm, 170 rpm, 180 rpm, 190 rpm or 200 rpm, but is not limited to such values, and values ​​not mentioned in this range are also applicable.

[0048] The mass ratio of the phosphorus-nitrogen co-modified hyperbranched polyol to 1,4-diazabicyclo[2.2.2]octane, defoamer, and leveling agent is (8-12):(0.3-0.4):(0.1-0.3):(0.1-0.3);

[0049] The defoamer is either BYK-066N or BYK-A530;

[0050] The leveling agent is either BYK-358N or BYK-331;

[0051] Secondly, the present invention provides a crack-resistant floor coating with a hyperbranched structure.

[0052] This application uses polytetrahydrofuran ether diol (PTFE) and 4,4'-methylenebis(phenyl isocyanate) to prepare a polyurethane prepolymer. In the reaction, the isocyanate groups of 4,4'-methylenebis(phenyl isocyanate) undergo a nucleophilic addition reaction with the terminal hydroxyl groups of PTFE to form urethane bonds. The flexible backbone structure of PTFE endows the system with excellent elasticity and low-temperature resistance, while the rigid aromatic ring structure of 4,4'-methylenebis(phenyl isocyanate) enhances the mechanical properties and chemical resistance of the polyurethane. The resulting polyurethane prepolymer, as the base resin for floor coatings, provides mechanical strength and chemical stability. Furthermore, due to the high reactivity of its terminal isocyanate groups, it can further participate in subsequent crosslinking reactions to form a three-dimensional crosslinked network, which is a key foundation for optimizing the overall system performance.

[0053] In this application, the phosphorus-nitrogen co-modified hyperbranched polyol is prepared by reacting pentaerythritol, trimethylolpropane, and di(methacryloyloxyethyl) hydrogen phosphate. Pentaerythritol and trimethylolpropane, as polyhydroxy compounds, undergo esterification with the hydroxyl groups in the phosphate ester structure to generate a phosphorus-containing hyperbranched framework. The introduction of diethanolamine further provides amino and hydroxyl groups, participating in crosslinking to form a hyperbranched network. Simultaneously, the introduction of amino groups also enhances the flame retardant properties of the material. The phosphorus-nitrogen co-modified hyperbranched polyol prepared in this way, through its multifunctional characteristics and high crosslinking density of the hyperbranched structure, not only improves the flame retardancy and crack resistance of the material but also significantly disperses stress in the system through the multidimensional crosslinking effect of the network structure.

[0054] The thiol-terminated functionalized polyether is prepared by reacting methyl mercaptoacetate with triphenylphosphine and diethylazodicarboxylate in tetrahydrofuran. In the reaction, diethylazodicarboxylate reacts with triphenylphosphine to generate a phosphite intermediate, simultaneously releasing an active intermediate. This active intermediate further reacts with methyl mercaptoacetate, fixing its thiol moiety at the end of the polyether molecule's main chain, completing the end-group conversion. Polypropylene glycol also undergoes an end-group conversion reaction, replacing its hydroxyl terminus with a thiol group, generating the thiol-terminated functionalized polyether. Since thiol groups are readily oxidized to disulfide bonds, this application uses the antioxidant 2,6-di-tert-butyl-p-cresol to capture oxidative free radicals, inhibiting the oxidation reaction of thiol groups and ensuring their stability. In subsequent reactions, the thiol-terminated functionalized polyether utilizes the high reactivity of the thiol group to form thiourea bonds or other cross-linked structures, further optimizing the uniformity and flexibility of the cross-linked network.

[0055] This application uses calcium carbonate as a filler and modifies it with a titanate coupling agent. The titanate coupling agent reacts with the hydroxyl groups on the surface of calcium carbonate to form titanium-oxygen bonds and introduces organic groups on the surface of calcium carbonate, improving the interfacial compatibility between the filler and the polyurethane matrix. The modified filler not only improves the mechanical properties of the composite material, but also significantly reduces the risk of crack propagation caused by uneven filler dispersion by improving interfacial bonding. At the same time, the introduction of glass fiber and polypropylene fiber further enhances the crack resistance of the material. After modification with 3-aminopropyltriethoxysilane, the ethoxy groups on the surface of the glass fiber react with the hydroxyl groups of the glass fiber to form silicon-oxygen bonds, while the amino groups enhance the chemical bonding with the matrix; while the polypropylene fiber, after plasma treatment, introduces polar groups on its surface, which significantly improves its compatibility with the matrix. The combination of the two fibers provides a complementary reinforcement effect, with glass fiber providing high strength reinforcement and polypropylene fiber effectively mitigating stress concentration during material deformation through toughening.

[0056] Meanwhile, significant synergistic effects exist within the system of this application. The phosphorus-nitrogen co-modified hyperbranched polyol, through its multifunctional groups and hyperbranched structure, forms a highly cross-linked three-dimensional network with the polyurethane prepolymer, enhancing the material's mechanical properties and crack resistance through a combination of rigidity and flexibility. The modified filler, combined with the flexible matrix, optimizes the distribution of the material's mechanical properties, further improving crack resistance. Glass fiber and polypropylene fiber, through surface modification, achieve a stronger bond with the matrix interface, synergistically improving crack resistance and forming a complementary rigid-flexible reinforcement mechanism. The thiol-terminated functionalized polyether, through its flexible adjustment effect, synergizes with the highly cross-linked structure to further optimize the uniformity of the cross-linked network and the overall performance of the material. Overall, the synergistic effect of multiple components jointly constructs a floor coating system with excellent mechanical properties and outstanding crack resistance.

[0057] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0058] The polyurethane prepolymer prepared by polytetrahydrofuran ether diol and 4,4'-methylene bis(phenyl isocyanate) in this application combines the characteristics of a flexible main chain and a rigid aromatic ring, giving the material excellent elasticity, low temperature resistance and mechanical strength. At the same time, the formed urethane bonds provide good chemical stability, providing a solid mechanical performance foundation for floor coatings.

[0059] In this application, phosphorus and nitrogen co-modified hyperbranched polyols react with polyurethane prepolymers through multifunctional groups and hyperbranched network structures to form a three-dimensional network with high crosslinking density, significantly improving the crack resistance of the material. The introduction of phosphorus and nitrogen elements also endows the system with excellent flame retardancy and heat resistance.

[0060] The mid-thiol functionalized polyether in this application participates in the formation of structures such as thiourea bonds during the crosslinking process due to the high reactivity of the thiol group. At the same time, its flexible segments optimize the uniformity of the crosslinking network and improve the flexibility and crack resistance of the system.

[0061] In this application, calcium carbonate filler is modified by titanate coupling agent to improve the interfacial bonding between inorganic filler and organic matrix, thereby enhancing the mechanical properties of composite material and effectively inhibiting crack propagation caused by uneven filler dispersion.

[0062] This application incorporates glass fiber and polypropylene fiber, and improves the interfacial bonding strength with the matrix through surface modification. Glass fiber provides high-strength reinforcement, while polypropylene fiber, through its flexibility and toughening effect, alleviates stress concentration during deformation. The synergistic effect of both enhances the crack resistance of the material.

[0063] The components in the system form a significant synergistic effect. The combination of hyperbranched structure, end-thiol functionalized polyether, modified filler and fiber gives the floor coating excellent comprehensive performance in terms of mechanical properties, durability and crack resistance. Detailed Implementation

[0064] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The embodiments described herein are specific implementations of the present invention and are used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary and should not be construed as limiting the implementation of the present invention or the scope of protection of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the content disclosed in the claims and the specification of this application. These technical solutions include technical solutions that employ any obvious substitutions and modifications made to the embodiments described herein.

[0065] The chemical reagents used in the embodiments and comparative examples of this invention are all commercially available products and have not undergone further purification or processing.

[0066] The number-average molecular weight of the polypropylene glycol is Mn = 1000.

[0067] Example 1

[0068] This embodiment provides a hyperbranched anti-cracking floor coating and its preparation method. The preparation method of the hyperbranched anti-cracking floor coating specifically includes the following steps:

[0069] S1: Under a nitrogen atmosphere, polytetrahydrofuran ether diol was heated to 83°C, and 4,4'-methylene bis(phenyl isocyanate) was added in batches, wherein the mass ratio of polytetrahydrofuran ether diol to 4,4'-methylene bis(phenyl isocyanate) was 1:0.38. The reaction was maintained at this temperature for 2 hours to obtain reaction solution A. After filtering out impurities, a polyurethane prepolymer was obtained.

[0070] S2: 82g pentaerythritol, 205g di(methacryloyloxyethyl) hydrogen phosphate and 13g trimethylolpropane were mixed and heated to 90°C under a nitrogen atmosphere. 2.5g tetrabutyl titanate and 0.2g p-methoxyphenol were added to obtain reaction solution B. After reacting for 5h, reaction solution C was obtained. After cooling to 48°C, 105g diethanolamine was added dropwise and the reaction was continued for 2.7h to obtain reaction solution D. 37g n-butanol was added, and after cooling to room temperature, the mixture was filtered to obtain phosphorus and nitrogen co-modified hyperbranched polyol.

[0071] S3: 7.7g methyl mercaptoacetate, 10.8g diethylazodicarboxylate, and 15g triphenylphosphine were dispersed in 210g tetrahydrofuran to obtain solution E; 62g polypropylene glycol and 0.15g 2,6-di-tert-butyl-p-cresol were mixed under a nitrogen atmosphere, and solution E was added dropwise to obtain reaction solution F. The reaction was carried out at room temperature for 5h, filtered, and distilled under reduced pressure to obtain thiol-terminated functionalized polyether.

[0072] S4: Calcium carbonate is dispersed in anhydrous ethanol to obtain a first slurry; an ethanol solution of titanate coupling agent KR-TTS is added to obtain a mixed slurry, wherein the amount of titanate coupling agent KR-TTS added is 1.5% of the mass of calcium carbonate. After stirring at 40℃ for 40 min, the mixture is rotary evaporated, dried, and sieved to obtain a modified filler with a particle size of 10 μm.

[0073] S5: Immerse glass fibers in an ethanol solution of 1.8 wt.% 3-aminopropyltriethoxysilane for 50 min, wherein the amount of 3-aminopropyltriethoxysilane is 4.8% of the glass fiber mass. After filtration and drying, pretreated glass fibers are obtained. Polypropylene fibers are subjected to plasma treatment to obtain pretreated polypropylene fibers, wherein the plasma treatment power is 300W and the time is 80s.

[0074] S6: Mix 82g of polyurethane prepolymer with 10g of phosphorus-nitrogen co-modified hyperbranched polyol and 5g of end-thiol functionalized polyether for 8 minutes to obtain the first mixed paint. Add 10g of modified filler in batches and stir at 400rpm for 8 minutes to obtain the second mixed paint. Mix 1g of pretreated glass fiber and 1.8g of pretreated polypropylene fiber with 20g of polyurethane prepolymer to obtain premixed fiber. Add it to the second mixed paint and stir at 100rpm to obtain the third mixed paint. Add 0.35g of 1,4-diazabicyclo[2.2.2]octane, 0.1g of defoamer BYK-A530 and 0.2g of leveling agent BYK-358N. After uniform dispersion, vacuum defoaming is performed to obtain a hyperbranched anti-cracking floor paint.

[0075] Example 2

[0076] This embodiment provides a hyperbranched anti-cracking floor coating and its preparation method. The preparation method of the hyperbranched anti-cracking floor coating specifically includes the following steps:

[0077] S1: Under a nitrogen atmosphere, polytetrahydrofuran ether diol is heated to 80°C, and 4,4'-methylene bis(phenyl isocyanate) is added in batches, wherein the mass ratio of polytetrahydrofuran ether diol to 4,4'-methylene bis(phenyl isocyanate) is 1:0.35. The reaction is maintained at this temperature for 3 hours to obtain reaction solution A. After filtering out impurities, a polyurethane prepolymer is obtained.

[0078] S2: 84g pentaerythritol, 208g di(methacryloyloxyethyl) hydrogen phosphate and 14g trimethylolpropane were mixed and heated to 95°C under a nitrogen atmosphere. 2.8g tetrabutyl titanate and 0.26g p-methoxyphenol were added to obtain reaction solution B. After reacting for 4h, reaction solution C was obtained. After cooling to 45°C, 107g diethanolamine was added dropwise and the reaction was continued for 2.4h to obtain reaction solution D. 34g n-butanol was added, and after cooling to room temperature, the mixture was filtered to obtain phosphorus and nitrogen co-modified hyperbranched polyol.

[0079] S3: 7.4 g of methyl mercaptoacetate, 10.3 g of diethylazodicarboxylate, and 15.5 g of triphenylphosphine were dispersed in 215 g of tetrahydrofuran to obtain solution E; 65 g of polypropylene glycol and 0.18 g of 2,6-di-tert-butyl-p-cresol were mixed under a nitrogen atmosphere, and solution E was added dropwise to obtain reaction solution F. The reaction was carried out at room temperature for 5.5 h, filtered, and distilled under reduced pressure to obtain thiol-terminated functionalized polyether.

[0080] S4: Calcium carbonate is dispersed in anhydrous ethanol to obtain a first slurry; an ethanol solution of titanate coupling agent KR-TTS is added to obtain a mixed slurry, wherein the amount of titanate coupling agent KR-TTS added is 1% of the mass of calcium carbonate. After stirring at 45℃ for 50 min, the mixture is rotary evaporated, dried, and sieved to obtain a modified filler with a particle size of 9 μm.

[0081] S5: Immerse glass fibers in an ethanol solution of 1 wt.% 3-aminopropyltriethoxysilane for 55 min, wherein the amount of 3-aminopropyltriethoxysilane is 4% of the mass of the glass fibers. After filtration and drying, pretreated glass fibers are obtained. Polypropylene fibers are subjected to plasma treatment to obtain pretreated polypropylene fibers, wherein the plasma treatment power is 350W and the time is 85s.

[0082] S6: Mix 83g of polyurethane prepolymer with 11g of phosphorus-nitrogen co-modified hyperbranched polyol and 4g of end-thiol functionalized polyether for 7 minutes to obtain the first mixed paint. Add 12g of modified filler in batches and stir at 500rpm for 5 minutes to obtain the second mixed paint. Mix 1.5g of pretreated glass fiber and 1.4g of pretreated polypropylene fiber with 20g of polyurethane prepolymer to obtain premixed fiber. Add it to the second mixed paint and stir at 150rpm to obtain the third mixed paint. Add 0.38g of 1,4-diazabicyclo[2.2.2]octane, 0.3g of defoamer BYK-066N and 0.25g of leveling agent BYK-331. After uniform dispersion, vacuum defoaming is performed to obtain a hyperbranched anti-cracking floor paint.

[0083] Example 3

[0084] This embodiment provides a hyperbranched anti-cracking floor coating and its preparation method. The preparation method of the hyperbranched anti-cracking floor coating specifically includes the following steps:

[0085] S1: Under a nitrogen atmosphere, polytetrahydrofuran ether diol was heated to 85°C, and 4,4'-methylene bis(phenyl isocyanate) was added in batches, wherein the mass ratio of polytetrahydrofuran ether diol to 4,4'-methylene bis(phenyl isocyanate) was 1:0.37. The reaction was maintained at this temperature for 3.5 h to obtain reaction solution A. After filtering out impurities, a polyurethane prepolymer was obtained.

[0086] S2: Mix 80g pentaerythritol, 200g di(methacryloyloxyethyl) hydrogen phosphate and 10g trimethylolpropane, heat to 80℃ under nitrogen atmosphere, add 2g tetrabutyl titanate and 0.1g p-methoxyphenol to obtain reaction solution B, react for 6h to obtain reaction solution C, cool to 40℃ and add 100g diethanolamine dropwise and continue to react for 2h to obtain reaction solution D, add 30g n-butanol, cool to room temperature and filter to obtain phosphorus and nitrogen co-modified hyperbranched polyol;

[0087] S3: Disperse 7g of methyl mercaptoacetate, 10g of diethylazodicarboxylate, and 15.8g of triphenylphosphine in 200g of tetrahydrofuran to obtain solution E; mix 64g of polypropylene glycol with 0.1g of 2,6-di-tert-butyl-p-cresol under a nitrogen atmosphere, add solution E dropwise to obtain reaction solution F, react at room temperature for 6h, filter, and distill under reduced pressure to obtain thiol-terminated functionalized polyether;

[0088] S4: Calcium carbonate is dispersed in anhydrous ethanol to obtain a first slurry; an ethanol solution of titanate coupling agent KR-TTS is added to obtain a mixed slurry, wherein the amount of titanate coupling agent KR-TTS added is 1.7% of the mass of calcium carbonate. After stirring at 48℃ for 55 min, the mixture is rotary evaporated, dried, and sieved to obtain a modified filler with a particle size of 8 μm.

[0089] S5: Immerse glass fibers in an ethanol solution of 2 wt.% 3-aminopropyltriethoxysilane for 58 min, wherein the amount of 3-aminopropyltriethoxysilane is 4.5% of the mass of the glass fibers. After filtration and drying, pretreated glass fibers are obtained. Polypropylene fibers are subjected to plasma treatment to obtain pretreated polypropylene fibers, wherein the plasma treatment power is 380W and the time is 87s.

[0090] S6: Mix 80g of polyurethane prepolymer with 8g of phosphorus-nitrogen co-modified hyperbranched polyol and 3g of end-thiol functionalized polyether for 5min to obtain the first mixed paint. Add 15g of modified filler in batches and stir at 560rpm for 10min to obtain the second mixed paint. Mix 2g of pretreated glass fiber and 1g of pretreated polypropylene fiber with 20g of polyurethane prepolymer to obtain premixed fiber. Add it to the second mixed paint and stir at 180rpm to obtain the third mixed paint. Add 0.3g of 1,4-diazabicyclo[2.2.2]octane, 0.2g of defoamer BYK-A530 and 0.1g of leveling agent BYK-331. After uniform dispersion, vacuum defoaming is performed to obtain the hyperbranched anti-cracking floor paint.

[0091] Example 4

[0092] This embodiment provides a hyperbranched anti-cracking floor coating and its preparation method. The preparation method of the hyperbranched anti-cracking floor coating specifically includes the following steps:

[0093] S1: Under a nitrogen atmosphere, polytetrahydrofuran ether diol was heated to 82°C, and 4,4'-methylene bis(phenyl isocyanate) was added in batches, wherein the mass ratio of polytetrahydrofuran ether diol to 4,4'-methylene bis(phenyl isocyanate) was 1:0.4. The reaction was maintained at this temperature for 4 hours to obtain reaction solution A. After filtering out impurities, a polyurethane prepolymer was obtained.

[0094] S2: Mix 85g pentaerythritol, 210g di(methacryloyloxyethyl) hydrogen phosphate and 15g trimethylolpropane, heat to 100℃ under nitrogen atmosphere, add 3g tetrabutyl titanate and 0.3g p-methoxyphenol to obtain reaction solution B, react for 5.5h to obtain reaction solution C, cool to 50℃ and add 110g diethanolamine dropwise and continue to react for 3h to obtain reaction solution D, add 40g n-butanol, cool to room temperature and filter to obtain phosphorus and nitrogen co-modified hyperbranched polyol;

[0095] S3: Disperse 8g of methyl mercaptoacetate, 11g of diethylazodicarboxylate, and 16g of triphenylphosphine in 220g of tetrahydrofuran to obtain solution E; mix 60g of polypropylene glycol with 0.2g of 2,6-di-tert-butyl-p-cresol under a nitrogen atmosphere, add solution E dropwise to obtain reaction solution F, react at room temperature for 5.7h, filter, and distill under reduced pressure to obtain thiol-terminated functionalized polyether;

[0096] S4: Calcium carbonate is dispersed in anhydrous ethanol to obtain a first slurry; an ethanol solution of titanate coupling agent KR-TTS is added to obtain a mixed slurry, wherein the amount of titanate coupling agent KR-TTS added is 2% of the mass of calcium carbonate. After stirring at 50℃ for 60 min, the mixture is rotary evaporated, dried, and sieved to obtain a modified filler with a particle size of 12 μm.

[0097] S5: Immerse glass fibers in an ethanol solution of 1.5 wt.% 3-aminopropyltriethoxysilane for 60 min, wherein the amount of 3-aminopropyltriethoxysilane is 5% of the mass of the glass fibers. After filtration and drying, pretreated glass fibers are obtained. Polypropylene fibers are subjected to plasma treatment to obtain pretreated polypropylene fibers, wherein the plasma treatment power is 400W and the time is 90s.

[0098] S6: Mix 85g of polyurethane prepolymer with 12g of phosphorus-nitrogen co-modified hyperbranched polyol and 6g of end-thiol functionalized polyether for 10min to obtain the first mixed paint. Add 20g of modified filler in batches and stir at 600rpm for 7min to obtain the second mixed paint. Mix 1.8g of pretreated glass fiber and 2g of pretreated polypropylene fiber with 20g of polyurethane prepolymer to obtain premixed fiber. Add it to the second mixed paint and stir at 200rpm to obtain the third mixed paint. Add 0.4g of 1,4-diazabicyclo[2.2.2]octane, 0.25g of defoamer BYK-066N and 0.3g of leveling agent BYK-358N. After uniform dispersion, vacuum defoaming is performed to obtain the hyperbranched anti-cracking floor paint.

[0099] Comparative Example 1

[0100] This comparative example provides a crack-resistant floor coating with a hyperbranched structure. The difference from Example 1 is that phosphorus-nitrogen co-modified hyperbranched polyol is not prepared. In S6, linear polyester polyol polyethylene adipate is used instead of phosphorus-nitrogen co-modified hyperbranched polyol. Other operating steps and process parameters are exactly the same as in Example 1.

[0101] Comparative Example 2

[0102] This comparative example provides a hyperbranched anti-cracking floor coating. The difference from Example 1 is that trimethylolpropane is omitted in S2, and only pentaerythritol is used to react with di(methacryloyloxyethyl) hydrogen phosphate. Other operating steps and process parameters are exactly the same as in Example 1.

[0103] Comparative Example 3

[0104] This comparative example provides a hyperbranched anti-cracking floor coating. The difference from Example 1 is that no end-thiol functionalized polyether is prepared. In S6, polyethylene glycol-2000 is used instead of end-thiol functionalized polyether. Other operating steps and process parameters are exactly the same as in Example 1.

[0105] Comparative Example 4

[0106] This comparative example provides a crack-resistant floor coating with a hyperbranched structure. The difference from Example 1 is that only pretreated glass fiber is added in S6, and polypropylene fiber is omitted. Other operating steps and process parameters are exactly the same as in Example 1.

[0107] Comparative Example 5

[0108] This comparative example provides a hyperbranched anti-cracking floor coating. The difference from Example 1 is that no pretreated glass fiber and pretreated polypropylene fiber are added in S6. Only a single filler modified filler is added. Other operating steps and process parameters are exactly the same as in Example 1.

[0109] The performance of the crack-resistant floor coatings with hyperbranched structures in Examples 1-4 and Comparative Examples 1-5 was tested, and the specific process is as follows:

[0110] The adhesion, impact resistance, hardness, and acid and alkali resistance of floor coatings were determined according to GB / T 22374-2018 "Floor Coating Materials".

[0111] The prepared floor paint was poured into a mold, cured, and cut into strips for oxygen index testing.

[0112] The test results are shown in Table 1.

[0113] Table 1: Test results of crack-resistant floor coatings with hyperbranched structures in Examples 1-4 and Comparative Examples 1-5

[0114]

[0115]

[0116] The test results of Example 1 and Comparative Example 1 show that replacing the phosphorus-nitrogen co-modified hyperbranched polyol with linear polyester polyethylene adipate results in the following: the linear structure cannot form a three-dimensional interpenetrating network, the crosslinking density is reduced, and the adhesion is decreased; the branching point stress dispersion effect of the hyperbranched polyol is lacking, the dynamic bonding ability is lost, and the impact energy absorption efficiency is reduced; the linear molecular chains are loosely packed, the uniformity of rigid filler dispersion is poor, and the overall rigidity of the coating is reduced; the ester bonds of the linear polyester are easily hydrolyzed by acids and alkalis, and the insufficient density leads to increased penetration of corrosive media; the lack of phosphorus and nitrogen flame retardant elements reduces the flame retardant performance.

[0117] The test results from Example 1 and Comparative Example 2 show that when trimethylolpropane is removed and only pentaerythritol is used to react with di(methacryloyloxyethyl) hydrogen phosphate, insufficient branching leads to an incomplete crosslinking network, reduced coating cohesion, and weakened bonding strength with the substrate. The low-branched structure cannot effectively transfer stress, increasing brittleness and causing rapid crack propagation. The crosslinking density decreases, the degree of freedom of molecular chain movement increases, and the rigidity is weakened. The distribution of phosphorus and nitrogen flame retardant elements is uneven, local corrosion resistance barriers fail, and acid and alkali corrosion is aggravated. Insufficient branching results in a loose char layer and a decrease in flame retardant efficiency.

[0118] Based on the test results of Example 1 and Comparative Example 3, it can be seen that when polyethylene glycol-2000 is used instead of terminal thiol-functionalized polyether in S6 without preparing terminal thiol-functionalized polyether, the hydrophilicity of polyethylene glycol leads to hygroscopic expansion at the interface, stress concentration during curing shrinkage, and local debonding; the dynamic bonding of thiol groups disappears, the coating cannot dissipate energy through reversible bond breaking, and brittleness increases; the crystallinity of polyethylene glycol segments improves short-term rigidity, but long-term performance decreases; polyethylene glycol segments are easily hydrolyzed in alkaline environments, resulting in loss of coating-substrate interfacial bonding and decreased acid and alkali resistance; the reduced crosslinking density leads to a decrease in the integrity of the char layer, but still retains some phosphorus and nitrogen flame retardant effect.

[0119] Based on the test results of Example 1 and Comparative Example 4, it can be seen that when only pretreated glass fiber is added in S6 and polypropylene fiber is removed, the rigid support of glass fiber maintains the interfacial bonding, but local stress concentration leads to potential microcracks; lacking the plastic deformation capacity of polypropylene fiber, the impact energy is only borne by the rigidity of glass fiber, and crack propagation is accelerated; the high modulus of glass fiber dominates the rigidity of the coating, but toughness is sacrificed; a single fiber cannot release interfacial stress through deformation, and alkaline medium penetrates along the fiber-resin interface; the effect on flame retardant performance is relatively small.

[0120] Based on the test results of Example 1 and Comparative Example 5, it can be seen that when no pretreated glass fiber and pretreated polypropylene fiber are added in S6, and only a single filler is added to modify the filler, the bridging effect of the fiber is lacking. The curing shrinkage stress directly causes microcracks and deteriorates the interface bonding. The filler only provides short-range reinforcement and does not provide long-range toughening with fiber, so the impact energy cannot be effectively dissipated. The rigidity contribution of the filler is retained, but the synergistic reinforcement effect of the fiber is lacking. Corrosive media preferentially penetrate through the filler-resin interface, and the overall protective properties of the coating decrease. Without fiber reinforcement, the carbon layer is prone to cracking, and the flame retardant performance decreases.

[0121] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for preparing a hyperbranched, crack-resistant floor coating, characterized in that, The preparation method includes: S1: Polytetrahydrofuran ether diol and 4,4'-methylene bis(phenyl isocyanate) are reacted at a constant temperature to obtain reaction solution A. After filtering out impurities, a polyurethane prepolymer is obtained. S2: Pentaerythritol, di(methacryloyloxyethyl) hydrogen phosphate, and trimethylolpropane are mixed, and tetrabutyl titanate is added to react with p-methoxyphenol to obtain reaction solution C. After cooling, diethanolamine is added to react to obtain reaction solution D. n-Butanol is added, and after cooling to room temperature, the mixture is filtered to obtain phosphorus and nitrogen co-modified hyperbranched polyol. S3: Methyl mercaptoacetate, diethylazodicarboxylate, and triphenylphosphine are dispersed in tetrahydrofuran to obtain solution E; polypropylene glycol and 2,6-di-tert-butyl-p-cresol are mixed and then added dropwise to solution E to obtain reaction solution F. The reaction is carried out at room temperature and post-treatment is performed to obtain thiol-terminated functionalized polyether. S4: Calcium carbonate is dispersed in anhydrous ethanol to obtain the first slurry; an ethanol solution of titanate coupling agent KR-TTS is added to obtain a mixed slurry, which is then stirred, rotary evaporated, dried, and sieved to obtain the modified filler. S5: Glass fiber is immersed in an ethanol solution of 3-aminopropyltriethoxysilane, filtered, and dried to obtain pretreated glass fiber; polypropylene fiber is subjected to plasma treatment to obtain pretreated polypropylene fiber. S6: The polyurethane prepolymer is mixed with phosphorus and nitrogen co-modified hyperbranched polyol and end-thiol functionalized polyether to obtain the first mixed paint. After adding the modified filler, the mixture is stirred to obtain the second mixed paint. The pretreated glass fiber and pretreated polypropylene fiber are mixed with the polyurethane prepolymer to obtain the premixed fiber. The fiber is added to the second mixed paint and stirred to obtain the third mixed paint. 1,4-diazabicyclo[2.2.2]octane, defoamer and leveling agent are added and dispersed evenly. After vacuum defoaming, the hyperbranched anti-cracking floor paint is obtained.

2. The method for preparing a hyperbranched, crack-resistant floor coating according to claim 1, characterized in that, In S1: the mass ratio of the polytetrahydrofuran ether diol to 4,4'-methylene bis(phenyl isocyanate) is 1:(0.35-0.4).

3. The method for preparing a hyperbranched, crack-resistant floor coating according to claim 1, characterized in that, In S2: The mass ratio of pentaerythritol, di(methacryloyloxyethyl) hydrogen phosphate, and trimethylolpropane is (80-85):(200-210):(10-15); The mass ratio of pentaerythritol, tetrabutyl titanate, and p-methoxyphenol is (80-85):(2-3):(0.1-0.3). The mass ratio of pentaerythritol to diethanolamine is (80-85):(100-110); The mass ratio of pentaerythritol to n-butanol is (80-85):(30-40).

4. The method for preparing a hyperbranched, crack-resistant floor coating according to claim 1, characterized in that, In S3: The mass ratio of polypropylene glycol, methyl mercaptoacetate, diethylazodicarboxylate, and triphenylphosphine is (60-65):(7-8):(10-11):(15-16); The mass ratio of polypropylene glycol to tetrahydrofuran and 2,6-di-tert-butyl-p-cresol is (60-65):(200-220):(0.1-0.2).

5. The method for preparing a hyperbranched, crack-resistant floor coating according to claim 1, characterized in that, In S4: The amount of the titanate coupling agent KR-TTS added is 1-2% of the mass of calcium carbonate; The modified filler has a particle size of 8-12 μm.

6. The method for preparing a hyperbranched, crack-resistant floor coating according to claim 1, characterized in that, In S5: The amount of 3-aminopropyltriethoxysilane fed is 4-5% of the mass of the glass fiber; The power of the plasma treatment of the polypropylene fiber is 300-400W; The plasma treatment time for the polypropylene fibers is 80-90 seconds.

7. The method for preparing a hyperbranched, crack-resistant floor coating according to claim 1, characterized in that, In S6: The mass ratio of polyurethane prepolymer to phosphorus-nitrogen co-modified hyperbranched polyol and end-thiol functionalized polyether in the first mixed paint is (80-85):(8-12):(3-6); The mass ratio of polyurethane prepolymer to modified filler in the second mixed paint is (80-85):(10-20).

8. The method for preparing a hyperbranched, crack-resistant floor coating according to claim 1, characterized in that, In S6: The mass ratio of pretreated glass fiber, pretreated polypropylene fiber, and polyurethane prepolymer in the premixed fiber is (1-2):(1-2):20; The mass ratio of the phosphorus-nitrogen co-modified hyperbranched polyol to 1,4-diazabicyclo[2.2.2]octane, defoamer, and leveling agent is (8-12):(0.3-0.4):(0.1-0.3):(0.1-0.3).

9. The method for preparing a hyperbranched, crack-resistant floor coating according to claim 1, characterized in that, In S6: The defoamer is either BYK-066N or BYK-A530; The leveling agent is either BYK-358N or BYK-331.

10. A hyperbranched, crack-resistant floor coating, characterized in that, It is prepared according to any one of claims 1-9.

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