Elastic polyaspartate polyurea floor coating and preparation method thereof

Abstract

The application provides a flexible polyaspartic polyurea floor paint and a preparation method thereof. The floor paint comprises a main agent and a curing agent, wherein the main agent comprises a first polyaspartic resin, a second polyaspartic resin, a functional additive and a pigment filler; the curing agent comprises a first isocyanate and a second isocyanate; the first polyaspartic resin is selected from PAE0760, and the second polyaspartic resin is selected from F520; the first isocyanate is selected from a glycidyl ether compound modified HDI trimer; and the second isocyanate is selected from an HDI uretdione. The aspartic polyurea paint of the application can obviously improve the tensile strength and scratch resistance while keeping good elasticity, and improve the leveling performance, and is a solvent-free polyaspartic polyurea floor paint with excellent comprehensive performance.

Description

Technical Field

[0001] This invention belongs to the field of floor coating technology, specifically relating to an elastic polyaspartic acid ester polyurea floor coating and its preparation method. Background Technology

[0002] With the increasing application of floor coatings in the interior and exterior decoration of buildings, the defects of common floor system materials are becoming more and more obvious. For example, epoxy coating systems have poor impact resistance and crack resistance, and are prone to yellowing outdoors; elastic polyurethane systems have poor fatigue tear strength, strict construction environment restrictions, high sensitivity to air humidity and water vapor, and are difficult to deliver; various thin-film coatings, although they have high strength and are easy to apply, generally cannot compensate for floor defects due to their low film thickness.

[0003] Polyaspartic acid ester polyurea coating (aspartic polyurea coating) is a coating made by mixing and reacting polyaspartic acid ester (aspartic resin) with isocyanate and other components. Compared with other materials, aspartic polyurea coating has excellent construction characteristics such as rapid curing and low moisture sensitivity. The cured paint film has good abrasion resistance, weather resistance, and elasticity, and can be used for a long time indoors or directly exposed outdoors.

[0004] However, although commercially available elastic aspartic polyurea flooring materials have characteristics such as fast drying and good elasticity, their leveling properties are relatively weak, making it difficult to achieve solvent-free thick coating. Moreover, they cannot achieve good tensile strength and scratch resistance while maintaining high elasticity.

[0005] Therefore, in order to effectively address the application defects of this type of floor coating, it is necessary to develop a floor coating with good elasticity, tensile strength, and scratch resistance, as well as improved leveling properties, so that it can be suitable for more application scenarios. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention provides an elastic polyaspartic ester polyurea floor coating and its preparation method. By optimizing and modifying the raw material components in the elastic aspartic polyurea coating, and designing the formulation combination, this invention enables the aspartic polyurea coating to maintain good elastic properties while significantly improving its tensile strength and scratch resistance, as well as its leveling properties, resulting in a solvent-free polyaspartic ester polyurea floor coating with excellent comprehensive performance.

[0007] The technical solution provided by this invention is as follows: An elastic polyaspartic acid ester polyurea floor coating includes a main agent and a curing agent, wherein: the main agent includes a first polyaspartic acid ester resin, a second polyaspartic acid ester resin, functional additives, pigments and fillers; the curing agent includes a first isocyanate and a second isocyanate. The first polyaspartic acid ester resin is selected from PAE0760 and includes at least the components shown in Formula 1 and Formula 2: (Equation 1) (Equation 2); The second polyaspartic acid ester resin is selected from F520 and includes the components shown in Formula 1; The first isocyanate is selected from HDI trimer modified with glycidyl ether compounds; The second isocyanate is selected from HDI diureidone.

[0008] According to a preferred embodiment of the present invention, the weight parts of each component in the main agent are as follows: 40-55 parts of the first polyaspartic ester resin; 25-40 parts of the second polyaspartic ester resin; Functional additives, 1-5 parts; 15-22 parts of pigments and fillers; The weight parts of each component in the curing agent are as follows: 20-30 parts of the first isocyanate; 70-80 parts of the second isocyanate.

[0009] According to a preferred embodiment of the present invention, the weight parts of each component in the main agent are as follows: 45-50 parts of the first polyaspartic ester resin; 30-35 parts of the second polyaspartic acid ester resin; Functional additives, 2-4 parts; 15-20 parts of pigments and fillers; The weight parts of each component in the curing agent are as follows: 23-28 parts of the first isocyanate; 72-77 parts of the second isocyanate.

[0010] According to a preferred embodiment of the present invention, the weight parts of each component in the functional adjuvant in the main agent are as follows: Dispersant 0.1~0.5 parts; Defoamer 0.2~1 part; Leveling agent 0.1~0.5 parts; 0.5-1.5 parts of absorbent; 0.5 to 1.5 parts of coupling agent.

[0011] The weight percentages of each component in the pigments and fillers are as follows: 3-7 parts pigment; 12-15 parts of filler.

[0012] According to a preferred embodiment of the present invention, the preparation method of the first polyaspartic ester resin includes: 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane and polyetheramine were mixed and stirred at a molar ratio of 1:(7~10) and heated to 50~70℃ to homogenize the system. Diethyl maleate was added dropwise, with a molar ratio of diethyl maleate to 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane of (5~7):1. The mixture was then reacted at 50~70℃ for 20~30 hours to prepare polyaspartic acid ester resin PAE0760.

[0013] According to a preferred embodiment of the present invention, in the first isocyanate, the glycidyl ether compound is selected from butyl monoepoxy glycidyl ether and C12-14 alkyl glycidyl ether, preferably butyl monoepoxy glycidyl ether.

[0014] According to a preferred embodiment of the present invention, the method for preparing the first isocyanate includes: S1. A modifier is prepared by pre-reacting glycidyl ether with a secondary amine; S2. Add the modifier prepared in S1 to the HDI trimer, and react to obtain HDI trimer modified with glycidyl ether compounds.

[0015] According to a preferred embodiment of the present invention, in step S1, glycidyl ether and secondary amine are mixed and reacted at a molar ratio of epoxy group to secondary amine group of (1.3~1.6):1.

[0016] According to a preferred embodiment of the present invention, the mass ratio of the main agent to the curing agent is 1:0.6~0.8; the molar ratio of -NCO in the curing agent to -NH in the main agent, -NCO / -NH, is 1~1.5, preferably 1.2~1.4.

[0017] Another aspect of the present invention is to provide a method for preparing an elastic polyaspartic acid ester polyurea floor coating, comprising the following steps: (1) Mix and disperse the specified amounts of first polyaspartic acid ester resin, second polyaspartic acid ester resin, functional additives, pigments and fillers evenly as the main agent; (2) Mix and disperse the specified amounts of the first isocyanate and the second isocyanate evenly as a curing agent; (3) When ready for use, mix the main agent and the curing agent in a mass ratio of 5:(3~4) and stir evenly before application; Steps (1) and (2) are not in any particular order.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The elastic polyaspartic acid ester polyurea floor coating of the present invention, through the optimization and combination of components, enables the aspartic polyurea coating to maintain good elastic properties while significantly improving the tensile strength of the aspartic polyurea coating, overcoming the shortcomings of existing aspartic polyurea coatings that cannot simultaneously take into account both elastic properties and tensile strength.

[0019] The elastic polyaspartic acid ester polyurea floor coating of the present invention, through the optimization and combination of components, enables the aspartic polyurea coating to maintain good elasticity while significantly improving the scratch resistance of the aspartic polyurea coating, overcoming the shortcomings of existing aspartic polyurea coatings that cannot simultaneously achieve both elasticity and scratch resistance.

[0020] The elastic polyaspartic acid ester polyurea floor coating of the present invention can improve the scratch resistance and tensile strength of the floor coating while maintaining good elasticity. The improvement of its comprehensive performance makes it widely applicable to many application scenarios, such as warehousing and logistics, industrial production and manufacturing, and can also be applied to targeted application scenarios such as the flooring of mobile robots such as AGV and AMR.

[0021] The elastic polyaspartic ester polyurea floor coating of the present invention, through the optimization and combination of components, can improve the leveling performance of aspartic polyurea coating, eliminating the need to add diluent to prolong the leveling time, which is beneficial for achieving solvent-free thick coating, and has the advantage of low VOC. Detailed Implementation

[0022] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0023] All raw materials used in this invention can be purchased through conventional commercial channels.

[0024] The elastic polyaspartic acid ester polyurea floor coating of the present invention comprises a main agent (component A) and a curing agent (component B), wherein: Component A includes a first polyaspartic ester resin, a second polyaspartic ester resin, a dispersant, a defoamer, a leveling agent, a water absorbent, a coupling agent, pigments, and fillers; Component B includes a first isocyanate and a second isocyanate.

[0025] The first polyaspartic acid ester resin is selected from PAE0760, which contains a variety of active ingredients with secondary amine functional groups (-NH-), including at least the components shown in Formula 1 and Formula 2, with an equivalent of 260±10 (equivalent is secondary amine equivalent) and a viscosity of 100~200 mPa.s.

[0026] (Equation 1) (Equation 2).

[0027] The second polyaspartic acid ester resin is selected from F520, including the components shown in Formula 1, with an equivalent of 290±10 and a viscosity of 900~1300 mPa.s.

[0028] The first isocyanate is selected from HDI trimer modified with glycidyl ether compounds.

[0029] The second isocyanate is selected from HDI diureidone, i.e., HDI dimer.

[0030] The elastic polyaspartic acid ester polyurea floor coating of the present invention includes the steps of preparing component A, preparing component B, and mixing components A and B: (1) The preparation of component A includes the following steps: In a vacuum mixing tank, polyaspartic acid ester resin PAE0760, polyaspartic acid ester resin F520, dispersant, defoamer, and pigment were added sequentially. The equipment was stirred at a high speed of 800-1000 rpm, dispersing and grinding until the fineness was less than 50 micrometers, preferably less than 40 micrometers (detected by a scraper fineness gauge). Leveling agent and filler were then added, and the equipment was stirred at a high speed of 800-1000 rpm for 20-40 minutes. Water-absorbing agent and coupling agent were then added, and the equipment was stirred at a medium-low speed of 500-600 rpm for 3-10 minutes. After uniform mixing, nitrogen gas was used for metering and packaging. Component A of the elastic polyaspartic acid ester polyurea floor coating was obtained.

[0031] (2) The preparation of component B includes the following steps: HDI trimer modified with glycidyl ether compounds and HDI diurea were sequentially added to a vacuum mixing kettle. The equipment was controlled at a low speed of 300-500 r / min, and the mixture was stirred for 20-40 minutes. After uniform mixing, nitrogen gas was purged and the mixture was metered and packaged. Component B of the elastic polyaspartic acid ester polyurea floor coating was obtained.

[0032] (3) When ready for use, mix components A and B in a mass ratio of 5:(3~4) and stir evenly before application.

[0033] In the above steps (1) and (2), there is no distinction in the order of steps.

[0034] The preparation method of polyaspartic acid ester resin PAE0760 in component A includes the following steps: 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane (DMDC) and polyetheramine JEFFAMINE EDR-148 were added sequentially at a molar ratio of 1:(7~10). The mixture was stirred and heated to 50~70℃ and maintained for at least 20 minutes to homogenize the system. Diethyl maleate (DEM) was then added dropwise at a molar ratio of (5~7):1 to 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane (DMDC). The reaction was then carried out at 50~70℃ for 20~30 hours, with nitrogen gas purging to prevent side reactions. After the reaction was completed, the mixture was cooled to room temperature to obtain the prepared polyaspartic acid ester resin. The solid content of this polyaspartic acid ester resin was approximately 97%, the equivalent weight was 260±10, and the viscosity was 100~200 mPa·s.

[0035] The preparation method of HDI trimer modified with glycidyl ether compounds in component B includes the following steps: S1. Preparation of modifiers by pre-reaction of glycidyl ethers with secondary amines: According to the molar ratio of epoxy group to secondary amine group of (1.3~1.6):1, glycidyl ether is added to the reaction vessel and the temperature is maintained at 20~30℃; the secondary amine is slowly added dropwise, and the addition is completed in 1~2 hours; the temperature is raised to 50~60℃ and the reaction is continued for 4~6 hours until the secondary amine is completely reacted. The unreacted glycidyl ether is distilled off and recovered under reduced pressure, and the hydroxyl-containing modifier is obtained after cooling and is ready for use.

[0036] S2. Modification of HDI trimer: Add HDI trimer to the reactor, turn on nitrogen protection, and heat to 50-60℃. Slowly add the hydroxyl-containing modifier obtained from reaction S1 to the HDI trimer, controlling the adding rate and maintaining the reaction temperature at 60-70℃. After the addition is complete, continue the reaction at this temperature, taking samples periodically to titrate the NCO content using the di-n-butylamine method. Stop the reaction when the measured NCO content reaches 17.5%. Cool down to below 40℃, discharge the material, and obtain a mixture of modified HDI trimer polyisocyanates.

[0037] The technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0038] Example 1

[0039] An elastic polyaspartic acid ester polyurea floor coating includes component A and component B, with a mass ratio of component A to component B of 1:0.8, and a molar ratio of -NCO in component B to -NH in component A of 1.3.

[0040] Component A, by mass parts, includes: Polyaspartic acid ester resin PAE0760 (self-made) 48 parts 32 parts of polyaspartic acid ester resin (Feiyang New Materials, F520) Dispersant (Afcona polymer, Afcona 4080) 0.5 parts, Defoamer (TEGO 900) 0.1 parts, Defoamer (Hemings Deqian, De6800) 0.1 parts, Leveling agent (Afcona polymer, Afcona 3034) 0.3 parts, 1 part of absorbent (Suzhou Xiangyuan, IPHEO) 1 part of coupling agent (Wacker Chemicals, KH550) Pigment (Shandong Dongjia, titanium dioxide SR-2377) 5 parts, 12 parts of filler (Sibico, USA, 800 mesh silica powder); Component B, by mass parts, includes: 25 parts of HDI trimer modified with glycidyl ether compounds (self-made); 75 parts of HDI diureta (Wanhua Chemical, HT400).

[0041] In component A, polyaspartic acid ester resin PAE0760 is labeled R1, and polyaspartic acid ester resin F520 is labeled R2. The mass ratio of R1 to R2 is 60:40. In component B, glycidyl ether-modified HDI trimer is labeled H1, and HDI urea diketone is labeled H2. The mass ratio of H1 to H2 is 25:75.

[0042] The preparation method of polyaspartic acid ester resin PAE0760 in component A includes the following steps: 83.41 g of 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane (DMDC) (a complexed high-tech material, 0.35 mol) and 103.60 g of polyetheramine (Huntsman, USA, JEFFAMINE EDR-148, 2.79 mol) were added sequentially. The initial stirring speed was set to 100 rpm, and the temperature was raised to 60℃ and maintained for 30 minutes to homogenize the system.

[0043] 361.58 g of diethyl maleate (DEM) (Shenzhen Feiyang Specialty Materials, 2.10 mol) was added dropwise at a flow rate of 1.5 mL / min. After the addition was complete, the reaction was continued at 60℃ for 24 hours, with nitrogen gas purging to prevent side reactions. After the reaction was completed, the mixture was cooled to room temperature to obtain the prepared polyaspartic acid ester resin. PAE0760 had a solid content of 97±2%, an equivalent of 260±10 (secondary amine equivalent), and a viscosity of 100~200 mPa·s.

[0044] The preparation methods of the modified HDI trimer in component B include: S1. Preparation of modifiers by pre-reaction of glycidyl ethers with secondary amines: According to the molar ratio of epoxy group to secondary amine group of 1.5:1, 115.2g of butyl monoepoxy glycidyl ether (BGE) (Anhui Xinyuan Technology, CAS: 2426-08-6) was added to the reaction vessel and the temperature was maintained at 25℃. Diethylamine (Shanghai Maclean Reagent, CAS: 109-89-7) was slowly added dropwise under stirring, and the addition was completed in 1.5~2 hours. The temperature was raised to 55℃ and the reaction was continued for 5 hours until the diethylamine reacted completely. The reaction was carried out under reduced pressure to distill off and recover the unreacted BGE. After cooling, a hydroxyl-containing modifier was obtained. The product is a mixture with N,N-diethyl-3-butoxy-2-hydroxypropylamine ((C2H5)2N-CH2-CH(OH)-CH2-O-C4H9) as the main component, which is ready for use.

[0045] S2. Modification of HDI trimer: 1000g of HDI trimer (Wanhua Chemical, HT-100) was added to the reactor, nitrogen protection was activated, and the temperature was raised to 55℃. 118.3g of the hydroxyl-containing modifier obtained from reaction S1 was slowly added dropwise to the HDI trimer, controlling the dropping rate and maintaining the reaction temperature at 60-70℃. After the addition was complete, the reaction was continued at this temperature, and samples were taken periodically to titrate the NCO content using the di-n-butylamine method. The reaction was stopped when the measured NCO content reached 17.5%. The temperature was lowered to below 40℃, and the product was discharged to obtain a modified HDI trimer polyisocyanate mixture.

[0046] The preparation method of the above-mentioned elastic polyaspartic acid ester polyurea floor coating includes the steps of preparing component A, preparing component B, and mixing components A and B: (1) Preparation of component A: Polyaspartic acid ester resin PAE0760, polyaspartic acid ester resin F520, dispersant, defoamer, and pigment were sequentially added to a vacuum mixing tank. The equipment was stirred at a high speed of 900±25 r / min, and the mixture was dispersed and ground until the fineness was less than 40 microns (detected by a scraper fineness gauge). Leveling agent and filler were then added, and the equipment was stirred at a high speed of 900±25 r / min for 30 minutes. Water absorbent and coupling agent were then added, and the equipment was stirred at a medium-low speed of 550±25 r / min for 5 minutes. After thorough mixing, nitrogen gas was used for metering and packaging. Component A of the elastic polyaspartic acid ester polyurea floor coating was obtained.

[0047] (2) Preparation of component B: HDI trimer modified with glycidyl ether compounds and HDI diurea were sequentially added to a vacuum mixing kettle. The equipment was controlled at a low speed of 400±25 r / min, and the mixture was stirred for 30 min. After uniform mixing, nitrogen gas was purged and the mixture was metered and packaged. Component B of the elastic polyaspartic acid ester polyurea floor coating was obtained.

[0048] (3) When ready for use, mix components A and B in a mass ratio of 5:4 and stir evenly before application.

[0049] Example 2

[0050] Similar to Example 1, the selection and preparation methods of each component remain unchanged, with the only difference being: Component A, by mass parts, includes: 50 parts of polyaspartic acid ester resin PAE0760 30 parts of polyaspartic acid ester resin 0.5 parts dispersant 0.1 parts of defoamer 0.1 parts of defoamer 0.3 parts leveling agent 1 part absorbent 1 part of coupling agent 5 parts pigment 12 parts of filler; Component B, by mass parts, includes: 23 parts of HDI trimer modified with glycidyl ether compounds; 77 parts of HDI ureadione.

[0051] All other conditions remained the same as in Example 1. The mass ratio of component A to component B was 1:0.8, and the molar ratio of -NCO / -NH in components B and A remained at 1.3.

[0052] In component A, the mass ratio of R1 to R2 is 62:38. In component B, the mass ratio of H1 to H2 is 23:77.

[0053] Example 3

[0054] Similar to Example 1, the selection and preparation methods of each component remain unchanged, with the only difference being: Component A, by mass parts, includes: 45 parts of polyaspartic acid ester resin PAE0760 35 parts of polyaspartic acid ester resin 0.5 parts dispersant 0.1 parts of defoamer 0.1 parts of defoamer 0.3 parts leveling agent 1 part absorbent 1 part of coupling agent 5 parts pigment 12 parts of filler; Component B, by mass parts, includes: 28 parts of HDI trimer modified with glycidyl ether compounds; 72 parts of HDI diurea.

[0055] All other conditions remained the same as in Example 1. The mass ratio of component A to component B was 1:0.8, and the molar ratio of -NCO / -NH in components B and A remained at 1.3.

[0056] In component A, the mass ratio of R1 to R2 is 56:44. In component B, the mass ratio of H1 to H2 is 28:72.

[0057] Example 4

[0058] Same as Example 1, except that: the amount of glycidyl ether-modified HDI trimer in component B is 15 parts, and the amount of HDI diurene is 85 parts. The molar ratio of -NCO / -NH in the coating remains 1.3. Other parameters and conditions remain unchanged.

[0059] In component A, the mass ratio of R1 to R2 is 60:40. In component B, the mass ratio of H1 to H2 is 15:85.

[0060] Example 5

[0061] Same as Example 1, except that: the amount of glycidyl ether-modified HDI trimer in component B is 70 parts, and the amount of HDI diuretane is 30 parts. The molar ratio of -NCO / -NH in the coating remains 1.3. Other parameters and conditions remain unchanged.

[0062] In component A, the mass ratio of R1 to R2 is 60:40. In component B, the mass ratio of H1 to H2 is 70:30.

[0063] Example 6

[0064] Similar to Example 1, except that the glycidyl ether-modified HDI trimer in component B is replaced with unmodified HDI trimer (Wanhua Chemical, HT-100) at a ratio of 25 parts, and HDI diurene at a ratio of 75 parts. To maintain the -NCO / -NH molar ratio in the coating at 1.3, the mass ratio of component A to component B is 1:0.7. All other parameters remain unchanged.

[0065] In component A, the mass ratio of R1 to R2 is 60:40. In component B, the HDI trimer is labeled H3, and the mass ratio of H3 to H2 is 25:75.

[0066] Example 7

[0067] Similar to Example 1, except that: 100 parts of the HDI trimer modified with glycidyl ether compounds were used in component B, and no HDI diurea was added. To maintain the -NCO / -NH molar ratio in the coating at 1.3, the mass ratio of component A to component B was 1:0.9. All other parameters remained unchanged.

[0068] In component A, the mass ratio of R1 to R2 is 60:40. The isocyanate in component B consists only of H1.

[0069] Example 8

[0070] Similar to Example 1, except that: 100 parts of HDI diurene were added to component B, and no HDI trimer modified with glycidyl ether compounds was added. To maintain the -NCO / -NH molar ratio in the coating at 1.3, the mass ratio of component A to component B was 1:0.7. All other parameters remained unchanged.

[0071] In component A, the mass ratio of R1 to R2 is 60:40. The isocyanate in component B consists only of H2.

[0072] Example 9

[0073] Similar to Example 1, except that component B includes 100 parts of unmodified HDI trimer (Wanhua Chemical, HT-100), without the addition of HDI trimer modified with glycidyl ether compounds or HDI diurea. To maintain the -NCO / -NH molar ratio in the coating at 1.3, the mass ratio of component A to component B is 1:0.7. Other parameters remain unchanged.

[0074] In component A, the mass ratio of R1 to R2 is 60:40. The isocyanate in component B consists only of H3.

[0075] Example 10

[0076] Same as Example 1, except that: the amount of polyaspartic ester resin PAE0760 in component A is 64 parts, and the amount of polyaspartic ester resin F520 is 16 parts. The molar ratio of -NCO / -NH in the coating remains 1.3. Other parameters and conditions remain unchanged.

[0077] In component A, the mass ratio of R1 to R2 is 80:20. In component B, the mass ratio of H1 to H2 is 25:75.

[0078] Example 11

[0079] Similar to Example 1, except that: component A contains 20 parts of polyaspartic acid ester resin PAE0760 and 60 parts of polyaspartic acid ester resin F520. To maintain the -NCO / -NH molar ratio in the coating at 1.3, the mass ratio of component A to component B is 1:0.7. All other parameters remain unchanged.

[0080] In component A, the mass ratio of R1 to R2 is 25:75. In component B, the mass ratio of H1 to H2 is 25:75.

[0081] Example 12

[0082] Same as Example 1, except that the polyaspartic ester resin F520 in component A is replaced with F2850 (Feiyang New Materials). The molar ratio of -NCO / -NH in the coating remains at 1.3. Other parameters and conditions remain unchanged. F2850 is a polyaspartic ester resin containing flexible aliphatic chains.

[0083] In component A, polyaspartic acid ester resin F2850 is designated as R3, and the mass ratio of R1 to R3 is 60:40. In component B, the mass ratio of H1 to H2 is 25:75.

[0084] Example 13

[0085] Same as Example 1, except that: 80 parts of polyaspartic ester resin PAE0760 are added to component A, and polyaspartic ester resin F520 is not added. The molar ratio of -NCO / -NH in the coating remains at 1.3. Other parameters and conditions remain unchanged.

[0086] In component A, the polyaspartic ester resin consists only of R1. In component B, the mass ratio of H1 to H2 is 25:75.

[0087] Example 14

[0088] Similar to Example 1, except that: 80 parts of polyaspartic acid ester resin F520 were added to component A, and polyaspartic acid ester resin PAE0760 was not added. To maintain the -NCO / -NH molar ratio in the coating at 1.3, the mass ratio of component A to component B was 1:0.7. All other parameters remained unchanged.

[0089] In component A, the polyaspartic ester resin consists only of R2. In component B, the mass ratio of H1 to H2 is 25:75.

[0090] Comparative Example 1

[0091] Similar to Example 1, except that: component A contains 80 parts of polyaspartic acid ester resin F520, without the addition of polyaspartic acid ester resin PAE0760; component B contains 100 parts of HDI urea diketone, without the addition of HDI trimer modified with glycidyl ether compounds. To maintain the -NCO / -NH molar ratio in the coating at 1.3, the mass ratio of component A to component B is 1:0.7. Other parameters remain unchanged.

[0092] In component A, the polyaspartic ester resin contains only R2. In component B, the isocyanate contains only H2.

[0093] Test case

[0094] Tensile strength is the ability to resist fracture and is an important indicator for evaluating the mechanical properties of materials. Elongation at break is an important indicator for measuring the toughness and ductility of materials. In accordance with the provisions of GB / T22374-2018 "Floor Coating Materials", the elongation at break and tensile strength data of the floor coating films prepared by various resin combinations and curing agents in the above examples and comparative examples were tested.

[0095] While highly elastic paint films offer good abrasion resistance, their scratch resistance is generally not ideal. Aspartic polyurea coatings used as the final topcoat for flooring are particularly susceptible to scratches from embedded hard sand particles or other metallic or non-metallic particles, such as those found in the textures of pedestrian shoes or vehicle tires. This scratching can lead to deterioration of the paint film's performance and surface finish. The scratch resistance test was conducted using the methods outlined in GB / T22374-2018 "Flooring Coating Materials". Because this test was specifically designed for elastic flooring coatings, the abrasive used in section 6.3.25.2 of the scratch test was modified to a 400# industrial scouring pad. A smaller difference between the initial gloss and the gloss after scratching indicates stronger scratch resistance.

[0096] Flowability is a crucial indicator for evaluating the leveling properties of floor coatings, especially solvent-free floor coating topcoats. According to Table 4 of GB / T22374-2018 "Floor Coating Materials," the initial flowability of floor coating topcoats must be ≥140 mm. Currently, aspartic polyurea floor coatings are mainly high-solids solvent-based products. This is primarily because the flowability of conventional aspartic polyurea floor coatings often fails to meet the required standards. Typically, adding a suitable amount of diluent (usually 10-30%) can extend the leveling time to achieve the required flowability. However, considering the current market demand for new floor renovations and environmental requirements, there is a strong demand for solvent-free aspartic polyurea floor coatings. The aspartic polyurea floor coatings involved in this invention are all solvent-free formulations. The initial flowability of the floor coatings prepared in the above examples and comparative examples was tested.

[0097] The test results are shown below:

[0098] As shown in Comparative Example 1, R2 and H2 were used as components A and B, respectively, to create a conventional commercially available elastic aspartic polyurea flooring material. Although it has properties such as fast drying and good elasticity, it cannot simultaneously possess high elasticity and good tensile strength and scratch resistance. Furthermore, its leveling properties are weak, making it difficult to achieve solvent-free thick coatings.

[0099] Based on conventional commercially available formulations, this invention optimizes and blends key components in a two-component system. In the examples, the polyaspartic ester resin in component A is blended with R1 and R2, and the isocyanate in component B is blended with H1 and H2. Both achieve improvements in tensile strength and scratch resistance compared to Comparative Example 1. Under preferred blending ratios, as shown in Examples 1-3, the elastic aspartic polyurea coating maintains good elasticity (i.e., elongation at break is approximately 70%) while also exhibiting good tensile strength and scratch resistance, and achieving good leveling properties. Based on Comparative Example 1, the improvements in the preferred embodiments of this invention, while maintaining a high elongation at break, achieve an increase in tensile strength of approximately 138%, an increase in scratch resistance of approximately 45%, and an initial flowability of over 140 mm.

[0100] As shown in Example 6, when isocyanate in component B is compounded with unmodified HDI trimer H3 using H2, the elongation at break decreases by more than 40%, the tensile strength increases by approximately 79%, and the scratch resistance increases by approximately 26%. As shown in Example 12, when polyaspartic acid ester resin in component A is compounded with R3 using R1, the elongation at break decreases by more than 32%, the tensile strength increases by approximately 61%, and the scratch resistance increases by approximately 8%.

[0101] 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 implemented 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 exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. An elastic polyaspartic acid ester polyurea floor coating for improving scratch resistance, characterized in that, Includes the main agent and the curing agent, wherein: The main agent includes a first polyaspartic acid ester resin, a second polyaspartic acid ester resin, functional additives, and pigments and fillers; The curing agent includes a first isocyanate and a second isocyanate; The first polyaspartic acid ester resin includes at least the components shown in Formula 1 and Formula 2: (Equation 1) (Equation 2); The second polyaspartic acid ester resin comprises the components shown in Formula 1; The first isocyanate is selected from HDI trimer modified with glycidyl ether compounds; The second isocyanate is selected from HDI ureadione; The weight proportions of each component in the main agent are as follows: 45-50 parts of the first polyaspartic ester resin; 30-35 parts of the second polyaspartic acid ester resin; Functional additives, 2-4 parts; 15-20 parts of pigments and fillers; The weight parts of each component in the curing agent are as follows: 23-28 parts of the first isocyanate; 72-77 parts of the second isocyanate.

2. The floor coating according to claim 1, characterized in that, In the main agent The weight proportions of each component in the functional additive are as follows: Dispersant 0.1~0.5 parts; Defoamer 0.2~1 part; Leveling agent 0.1~0.5 parts; 0.5-1.5 parts of absorbent; 0.5-1.5 parts of coupling agent; The weight percentages of each component in the pigments and fillers are as follows: 3-7 parts pigment; 12-15 parts of filler.

3. The floor coating according to claim 1, characterized in that, The preparation method of the first polyaspartic acid ester resin includes: 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane and polyetheramine were mixed and stirred at a molar ratio of 1:(7~10) and heated to 50~70℃ to homogenize the system. Diethyl maleate was added dropwise, with a molar ratio of diethyl maleate to 3,3'-dimethyl-4,4'-diaminodicyclohexylmethane of (5~7):

1. The mixture was then reacted at 50~70℃ for 20~30 hours to prepare the first polyaspartic acid ester resin.

4. The floor coating according to claim 1, characterized in that, In the first isocyanate, the glycidyl ether compound is selected from butyl monoepoxy glycidyl ether and C12-14 alkyl glycidyl ether.

5. The floor coating according to claim 1, characterized in that, The method for preparing the first isocyanate includes: S1. A modifier is prepared by pre-reacting glycidyl ether with a secondary amine; S2. Add the modifier prepared in S1 to the HDI trimer, and react to obtain an HDI trimer modified with glycidyl ether compounds.

6. The floor coating according to claim 5, characterized in that, In step S1, glycidyl ether and secondary amine are mixed and reacted in a molar ratio of epoxy group to secondary amine group of (1.3~1.6):

1.

7. The floor coating according to claim 1, characterized in that, The mass ratio of the main agent to the curing agent is 1:0.6~0.8; the molar ratio of -NCO in the curing agent to -NH in the main agent, -NCO / -NH, is 1~1.

5.

8. The method for preparing the floor coating according to any one of claims 1-7, characterized in that, Includes the following steps: (1) Mix and disperse the specified amounts of first polyaspartic acid ester resin, second polyaspartic acid ester resin, functional additives, pigments and fillers evenly as the main agent; (2) Mix and disperse the specified amounts of the first isocyanate and the second isocyanate evenly as a curing agent; (3) When ready for use, mix the main agent and the curing agent in a mass ratio of 5:(3~4) and stir evenly before application; Steps (1) and (2) are not in any particular order.

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