Composite coating based on modified polyaspartic acid ester, floor system and construction method of floor system

Abstract

The invention relates to a composite coating based on modified polyaspartic acid ester, a terrace system and a construction method of the terrace system, and belongs to the technical field of terrace coatings. The composite coating provided by the invention comprises a bottom layer coating, a middle layer coating and a surface layer coating, the prime paint comprises the following components: specific organic silicon modified polyaspartic acid ester prime coat resin; the component of the middle-layer coating comprises specific polyaspartic acid ester floating coat resin; and the component of the surface layer coating comprises specific imide modified polyaspartic acid ester surface coating resin. The invention also provides a terrace system formed after construction of the composite coating, the terrace system has the advantages of crack resistance, compression resistance, moisture resistance, skid resistance, high adhesion, high strength, high wear resistance, yellowing resistance, long service life and the like, does not contain a solvent, avoids environmental pollution caused by volatilization, can keep excellent performance for a long time when being used for outdoor pavements, and has a wide application prospect. The problems of poor applicability, bubbling cracking, yellowing and the like of the existing floor coating in an outdoor severe environment are solved, the application range is wide, and the application value is high.

Description

Technical Field

[0001] The present invention relates to the technical field of floor coatings, and in particular to a combined coating based on modified polyaspartic acid ester, a floor system and a construction method thereof. Background Art

[0002] Floor construction services are widely used in people's daily lives, such as parking lot floors, garage floors, hospital floors, sports field floors, laboratory floors, warehouse floors, factory workshop floors, and other application scenarios; and paint floors are a development direction that is deeply loved by users in the field of floor construction services. As a structure where the ground base and the ground building are in contact with each other, the paint floor needs to have high strength and hardness to be able to withstand the load. At the same time, it must also have performance characteristics such as wear resistance, moisture resistance, anti-slip, corrosion resistance, and decorative beauty. In terms of weather resistance, chemical safety, construction efficiency, and floor service life, there will also be corresponding regulations based on user needs.

[0003] At present, the traditional floor coatings on the market are gradually facing elimination from the market due to their common deficiencies and disadvantages. In order to improve their leveling and operability, traditional coatings will add a large amount of volatile and toxic organic solvents, containing a large number of toxic carcinogens, such as formaldehyde and benzene substances, which will greatly increase the emission of volatile organic compounds, seriously pollute the environment, reduce air quality, and cause long-term and continuous harm to the health of users. After the traditional coatings are cured into films, the properties of the paint film coating itself, such as strength, hardness, impact resistance, adhesion, yellowing resistance, weather resistance, etc., often fail to meet the use requirements, and often have poor adaptability, bubbling, hollowing, shrinkage, powdering, sun yellowing and other undesirable phenomena, requiring frequent maintenance and renovation, wasting a lot of manpower, money and time.

[0004] In order to solve the pain points and difficulties faced by traditional coatings and to open up a new development path in the coatings market, a new, environmentally friendly, high-quality coating system is needed to add new vitality to the coatings market. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a combined coating, floor system and construction method based on modified polyaspartic acid ester. The floor system coating obtained by the combined coating provided by the present invention has excellent strength, hardness, weather resistance, etc., has a long service life, can withstand harsh outdoor environments, and has high practical value.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, the present invention provides a composite coating based on modified polyaspartic acid ester, comprising a primer, a middle layer and a top layer; the primer, the middle layer and the top layer all comprise a component A and a component B, wherein the component B is an isocyanate curing agent;

[0008] The component A of the bottom coating is an organosilicon-modified polyaspartic acid ester primer resin, and the organosilicon-modified polyaspartic acid ester primer resin conforms to the following general formula (I):

[0009]

[0010] wherein R and R1 are each independently selected from one of an alkyl group and an ether group, R2 is one of a C2-C4 alkyl group, and R3 is a methyl group or an ethyl group;

[0011] The A component of the middle layer coating comprises a polyaspartic acid ester middle coating resin, and the polyaspartic acid ester middle coating resin conforms to the following general formula (II):

[0012]

[0013] wherein R4, R5, R6, and R7 are each independently selected from a methyl group, a dimethyl group, a hydrogen group, a C2-C4 alkyl group, and a cycloalkyl group; and R8 is a cycloalkyl group, an ether group, an ester group, a polyether group, a polyethylene glycol group, a C2-C 10 One of the alkyl groups;

[0014] The A component of the surface coating comprises an imide-modified polyaspartic acid ester surface coating resin, and the imide-modified polyaspartic acid ester surface coating resin conforms to the following general formula (III):

[0015]

[0016] Wherein R9 is a long-chain alkyl or phenyl group, R 10 It is one of cyclohexyl, isophorone and phenyl.

[0017] The present invention aims at the problems existing in the existing traditional floor coatings. By selecting suitable modified polyaspartic acid ester resin as the main component of the coating, a composite coating is provided: comprising a base coating, a middle coating and a surface coating. The structure of the modified polyaspartic acid ester resin in the coatings selected for the coatings of different coatings is different according to the purpose of the coatings. All of them are solvent-free coatings. After curing, a solvent-free, high-solid content, environmentally friendly coating system can be formed. The system is safe and non-toxic, does not contain harmful substances such as fluorine, formaldehyde, benzene, etc., has high solid content and contains very low organic volatility, which has little harm to human health and has a wide range of applications.

[0018] During construction and use, the cured coating can form a unique modified polyaspartic acid ester resin system. Based on the chemical reaction between the secondary amine group of the polyaspartic acid ester resin and the isocyanate group of the isocyanate curing agent and utilizing the steric hindrance effect between molecules, it can obtain better performance than traditional coatings, such as strength and hardness, impact resistance, weather resistance, wear resistance, yellowing resistance, corrosion resistance, etc., thereby significantly improving the poor weather resistance, bubbling and cracking, shrinkage craters, yellowing, powdering and other undesirable phenomena of traditional coatings when used in harsh environments after curing.

[0019] Among them, the base coating selected by the present invention, including the silicone-modified polyaspartic acid ester primer resin, is applied to the ground substrate to form a high-adhesion, high-permeability, moisture-proof base coating, which has good penetration, sealing and moisture-proof effects, and specifically solves the problems of cracking, moisture, dusting and other problems of the coated ground base; the coating has a lower viscosity, which can enhance the adhesion of the coating to the ground base after curing; and the base coating can play a role in preliminary protection of the ground and strengthening the floor foundation, creating a better adhesion interface for the subsequent coating structure, improving the bonding strength with the upper coating structure, and reducing the adverse factors that may occur in the subsequent construction.

[0020] The present invention selects a middle-layer coating containing a specific polyaspartic acid ester middle-coating resin, and solidifies to form a high-compression, high-elasticity, solvent-free middle-coating on the basis of a base coating formed by a base coating: the middle-layer coating has a high elongation at break and compressive strength, and exhibits good crack resistance and impact resistance. It can not only firmly adhere to the surface of the base coating, but also be easily combined with the top coating on its upper surface, without affecting the recoatability, and plays an important supporting role; and it also plays the role of leveling the upper layer structure, providing a flat adhesion base surface for the coating of the top coating, and can eliminate holes and lines on the surface of the coated object, so that the structure of the subsequent coating layer is flatter, and the image clarity and fullness of the entire coating system are improved.

[0021] The present invention adopts a surface coating containing an imide-modified polyaspartic acid ester topcoat resin, which can further form a highly wear-resistant solvent-free topcoat on the middle coating, and has excellent properties such as transparency, matte, anti-slip, high wear resistance, UV resistance, and long-lasting antibacterial properties. At the same time, it has a good protective effect on the middle coating, and greatly improves the service life of the floor system constructed based on the combined coating of the modified polyaspartic acid ester of the present invention.

[0022] The combined coating based on modified polyaspartic acid ester provided by the present invention can form a high-performance floor coating layer system, which has the advantages of crack resistance and compression resistance, moisture resistance and anti-slip, high adhesion, high strength, high wear resistance, yellowing resistance, fast construction, long service life, etc., and does not require organic solvents, will not cause organic volatilization, and will not pollute the environment or harm human health; it can be applied to outdoor pavements and maintain excellent performance for a long time, and solves the problems of poor applicability of most floor coatings in harsh outdoor environments, frequent occurrence of undesirable phenomena such as bubbling and cracking, shrinkage cavities, yellowing, and powdering, and has high practical value.

[0023] Preferably, the bottom coating comprises the following components in parts by weight: 50-55 parts of organosilicon-modified polyaspartic acid ester primer resin, 30-40 parts of isocyanate curing agent, 1-2 parts of defoaming agent, 1-2 parts of leveling agent, 1-2 parts of wetting agent, and 1-2 parts of coupling agent; the middle coating comprises the following components in parts by weight: 50-55 parts of polyaspartic acid ester middle coating resin, 30-45 parts of isocyanate curing agent, 15-25 parts of hydroxide Aluminum, 10-15 parts of hollow glass microspheres, 5-8 parts of fumed silica, 10-15 parts of color paste, 1-2 parts of defoaming agent, 1-2 parts of dispersing agent, 1-2 parts of leveling agent, 1-2 parts of anti-settling agent; the surface coating includes the following components in parts by weight: 50-65 parts of imide modified polyaspartic acid ester top coating resin, 10-15 parts of isocyanate curing agent, 20-30 parts of spherical alumina, 1-2 parts of defoaming agent, 1-2 parts of dispersing agent.

[0024] Preferably, the isocyanate curing agent is at least one of TAL100, TUL100, ETP9011, HT300, and HT100; the defoaming agent is one of LD-2033, AT-99, QM-2030B, HF-3019, and G-8600; the leveling agent is one of BESM-6001, BESM-6131, QM-3348, SA-795, BYK333, and BYK354; the wetting agent is LD- The coupling agent is one of KH550, KH560 and KH602; the dispersant is one of QR-100, HP2019, CDI-187, NEO-1101, LD-124 and BESM-9101; the anti-settling agent is one of LD-1411, HR7022, MONENG-ASAS and ANJEKA4320-20X.

[0025] Further preferably, the bottom coating comprises the following components in parts by weight: 50 parts of organosilicon-modified polyaspartic acid ester primer resin, 32 parts of isocyanate curing agent, 1 part of defoamer, 1 part of leveling agent, 1 part of wetting agent, and 1 part of coupling agent; the middle coating comprises the following components in parts by weight: 50 parts of polyaspartic acid ester middle coating resin, 38 parts of isocyanate curing agent, 15 parts of aluminum hydroxide, 10 parts of hollow glass microspheres, 5 parts of fumed silica, 10 parts of color paste, 1 part of defoamer, 1 part of dispersant, 1 part of leveling agent, and 1 part of anti-settling agent; the surface coating comprises the following components in parts by weight: 50 parts of imide-modified polyaspartic acid ester top coating resin, 10 parts of isocyanate curing agent, 22 parts of spherical alumina, 1 part of defoamer, and 1 part of dispersant. The comprehensive performance of the coating formed after the combined coating under this ratio is better after construction and curing.

[0026] Further preferably, the isocyanate curing agent is at least one of ETP9011 and HT300; the defoaming agent is LD-2033; the leveling agent is QM-3348; the wetting agent is LD-8270; the coupling agent is KH550; the dispersant is LD-124; and the anti-settling agent is LD-1411.

[0027] As a preferred embodiment, the primer coating comprises the following components in parts by weight: 50 parts of silicone modified polyaspartic acid ester primer resin, 32 parts of isocyanate curing agent ETP9011, 1 part of defoaming agent LD-2033, 1 part of leveling agent QM-3348, 1 part of wetting agent LD-8270, and 1 part of coupling agent KH550; the middle layer coating comprises the following components in parts by weight: 50 parts of polyaspartic acid ester middle coating resin, 38 parts of isocyanate curing agent HT300, 15 parts of hydroxide Alumina, 10 parts of hollow glass microspheres, 5 parts of fumed silica, 10 parts of color paste, 1 part of defoamer LD-2033, 1 part of dispersant LD-124, 1 part of leveling agent QM-3348, 1 part of anti-settling agent LD-1411; the surface coating includes the following components in parts by weight: 50 parts of imide modified polyaspartic acid ester top coating resin, 10 parts of isocyanate curing agent HT300, 22 parts of spherical alumina, 1 part of defoamer LD-2033, and 1 part of dispersant LD-124.

[0028] Further preferably, in the general formula (I) of the organosilicon-modified polyaspartic acid ester primer resin, R is ethyl, R1 is ethyl, R2 is n-propyl, and R3 is ethyl;

[0029] In the general formula (II) of the polyaspartic acid ester mid-coat resin, R4 is methyl, R5 is methyl, R6 is methyl, R7 is methyl, and R8 is n-hexyl;

[0030] In the imide-modified polyaspartic acid ester top coating resin general formula (III), R9 is ethyl, R10 It is isophorone group.

[0031] Under the preferred scheme, the coating formed after the combined coating is constructed and cured has high hardness, high bonding strength, excellent water resistance, wear resistance and yellowing resistance, and has high tensile strength, compressive strength and elongation at break, with the best comprehensive performance.

[0032] Preferably, the preparation method of the organosilicon-modified polyaspartic acid ester primer resin is:

[0033] The maleic anhydride and R-based diol are mixed for esterification reaction, R1-based monoalcohol is added for end-capping, and then aminosilane is added for catalytic reaction to obtain the organosilicon-modified polyaspartic acid ester primer resin.

[0034] Further preferably, the molar ratio of maleic anhydride to R-based diol is (1.9-2.2):1; the specific steps of the esterification reaction are: mixing maleic anhydride, inhibitor and R-based diol, reacting at 130-140°C under nitrogen protection for 4-5 hours until the acid value does not change; the mass of the inhibitor is 0.1-0.2% of the total mass of the reactants.

[0035] More preferably, the molar ratio of the R1-based monohydric alcohol to the maleic anhydride is 1:(1.0-1.2); the end-capping is specifically: adding the R1-based monohydric alcohol, reacting until the acid value is less than 6 mg KOH / g, and then terminating the reaction.

[0036] Further preferably, the molar ratio of the amino group in the aminosilane to the maleic anhydride is (0.1-1):2, and the catalytic reaction is specifically: adding aminosilane and a catalyst, reacting at 55-65°C under nitrogen protection for 11-15h, the catalyst is sodium methoxide, and the mass of the catalyst is 0.03-0.06% of the total mass of the reactants.

[0037] Preferably, the preparation method of the polyaspartic acid ester mid-coat resin is:

[0038] Maleic anhydride and a monocyclic epoxy monomer are mixed for catalytic reaction to obtain maleic acid diol ester; the maleic acid diol ester is added to a divalent primary amine for reaction to obtain the polyaspartic acid ester mid-coat resin.

[0039] Further preferably, the monocyclic epoxy monomer is at least one of methyl propylene oxide, ethylene oxide, propylene oxide, butylene oxide, and pentane oxide; the dicyclic primary amine is one of 1,6-hexanediamine, 4,4-diaminodicyclohexylmethane, polyetheramine, polyethylene glycolamine, and isophoronediamine.

[0040] Further preferably, the molar ratio of the maleic anhydride to the mono-epoxy monomer is 1:(2.1-2.5); the catalytic reaction of the maleic anhydride and the mono-epoxy monomer is specifically as follows: the maleic anhydride and the mono-epoxy monomer are mixed, a catalyst is added, and the reaction is carried out at 70-100° C. for 3-5 hours to obtain the maleic acid diol ester; the catalyst is triphenylphosphine, and the mass of the catalyst is 0.02-0.08% of the total mass of the reactants.

[0041] Further preferably, the molar ratio of the maleic acid diol ester to the diprimary amine is (2.1-2.5):1; the reaction of adding the maleic acid diol ester to the diprimary amine is specifically as follows: the diprimary amine and sodium methoxide are mixed, and the maleic acid diol ester is added dropwise to the mixture under nitrogen protection at 44-48°C for 50-70 minutes, and then the temperature is raised to 70-90°C under nitrogen protection for 18-26 hours to obtain the polyaspartic acid ester mid-coat resin; the mass of the sodium methoxide is 0.04-0.12% of the total mass of the reactants.

[0042] Preferably, the preparation method of the imide-modified polyaspartic acid ester top coating resin is:

[0043] The diamine and the antioxidant are mixed evenly, and maleimide compounds and methyl methacrylate are added in sequence for catalytic reaction to obtain the imide-modified polyaspartic acid ester top coating resin.

[0044] Further preferably, the preparation method of the imide-modified polyaspartic acid ester top coating resin is: mix the diamine, catalyst and antioxidant, add the maleimide compound under nitrogen protection, and react at 60-70°C for 14-18h; then add methyl methacrylate, and react at 45-60°C for 3-5h to obtain the imide-modified polyaspartic acid ester top coating resin.

[0045] Further preferably, the diamine is one of cyclohexyldimethylamine, isophoronediamine, and phenyldimethylamine; the maleimide compound is N-alkylmaleimide or N-phenylmaleimide; the ratio of the amount of the diamine to the total amount of the maleimide compound and methyl methacrylate is 1:(2.1-2.6); the ratio of the amount of the maleimide compound to the amount of methyl methacrylate is 10:(0.6-2.2).

[0046] Further preferably, the catalyst is sodium ethoxide, and the mass of the catalyst is 0.02-0.08% of the total mass of the reactants; the antioxidant is antioxidant BHT, and the mass of the antioxidant is 0.02-0.08% of the total mass of the reactants.

[0047] It should be noted that the preparation method of the organosilicon-modified polyaspartic acid primer resin, polyaspartic acid middle coating resin and imide-modified polyaspartic acid top coating resin of the present invention is not limited to the above-mentioned types. Those skilled in the art may adopt other preparation processes for synthesis according to actual needs, as long as the structural composition of the organosilicon-modified polyaspartic acid primer resin, polyaspartic acid middle coating resin and imide-modified polyaspartic acid top coating resin is not affected.

[0048] In a second aspect, the present invention provides a floor system obtained by construction using the above-mentioned modified polyaspartic acid ester-based composite coating.

[0049] Preferably, the floor system comprises a ground base layer, a primer layer, a mid-coat layer and a top-coat layer in sequence.

[0050] In a third aspect, the present invention provides a construction method of the above-mentioned floor system, comprising the following steps:

[0051] S1, applying the primer on the ground base, and curing for 2.5-3.5h to obtain a base coating;

[0052] S2, coating the middle layer coating on the upper surface of the base coating, and curing for 3.5-4.5 hours to obtain a middle coating;

[0053] S3, polishing the upper surface of the middle coating, applying the surface coating, curing for 2.5-3.5h, obtaining the surface coating, and completing the construction of the floor system.

[0054] Preferably, the ground base is a pre-treated ground base, and the pre-treatment includes caulking, grinding, leveling and cleaning. The pre-treatment obtains a better ground foundation, making the ground base easier and more suitable for construction, thereby improving construction efficiency.

[0055] Preferably, the thickness of the primer layer is 0.2-0.4 mm, the thickness of the middle layer is 1.0-1.2 mm, and the thickness of the top layer is 0.3-0.6 mm.

[0056] The above-mentioned construction scheme is adopted to construct on the ground base layer, and the base coating provided by the present invention is applied to the ground substrate, and cured to form a high-adhesion, high-permeability, and moisture-proof base coating; then, a middle-layer coating is applied and cured on the basis of the base coating to form a high-compression, high-elasticity, and solvent-free middle coating, and the surface of the cured middle coating is polished to obtain a better adhesion of the surface layer; finally, the above-mentioned surface coating is used to further form a highly wear-resistant solvent-free top coating on the middle coating, and the floor system of the present invention that combines the excellent performance of the modified polyaspartic acid ester system is comprehensively obtained.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] The present invention provides a combined coating based on modified polyaspartic acid ester, which can form a floor system with a solvent-free modified polyaspartic acid ester resin coating after construction on the ground base, and provides an environmentally friendly coating system with 100% solid content: it does not contain organic solvents and harmful substances such as fluorine, formaldehyde, toluene, etc., and will not cause environmental hazards caused by the volatilization of organic solvents, while ensuring the health of users. In addition, the floor system formed by the coating after construction has many characteristics such as crack resistance, moisture resistance, yellowing resistance, high wear resistance, high strength, impact resistance, high stability, long service life, and beautiful decoration, which can well meet the user's demand for floor quality effects. At the same time, the construction method provided by the present invention adjusts and improves the operable time, controls the construction period of the floor system within a relatively short time range, achieves efficient construction, and the floor system is quickly put into use, which has high practical value and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of the structure of a floor system obtained by construction of a combined coating based on modified polyaspartic acid ester according to the present invention;

[0060] The meanings of the symbols in the accompanying drawings are as follows:

[0061] 1 - ground base, 2 - base coating, 3 - middle coating, 4 - top coating. DETAILED DESCRIPTION

[0062] In order to better illustrate the purpose, technical scheme and advantages of the present invention, the present invention will be further described below in conjunction with specific examples. The test methods used in the following examples are conventional methods unless otherwise specified; the materials and reagents used are reagents and materials that can be obtained from commercial channels unless otherwise specified.

[0063] The specific structures of the silicone-modified polyaspartic acid ester primer resin, polyaspartic acid ester mid-coat resin, and imide-modified polyaspartic acid ester top-coat resin of component A in the following examples and comparative examples are shown in Table 1.

[0064] Table 1 Structural composition of modified polyaspartic acid esters in Examples and Comparative Examples

[0065]

[0066] Examples 1-2 and Comparative Examples 1-4

[0067] Examples 1-2 are examples of the combined coatings based on modified polyaspartic acid esters of the present invention, wherein Example 1 includes a primer 1, a middle layer 1 and a top layer 1; Example 2 includes a primer 2, a middle layer 2 and a top layer 2.

[0068] The difference between the combined coatings of Comparative Examples 1, 2 and 3 and Example 1 is that:

[0069] Comparative Example 1: The base coating 1 in Example 1 is replaced by base coating 3;

[0070] Comparative Example 2: The middle layer coating 1 in Example 1 is replaced by the middle layer coating 3;

[0071] In comparative example 3, the surface coating 1 in example 1 is replaced by surface coating 3.

[0072] The combined coating of Comparative Example 4 includes a primer 3, a middle layer 3 and a top layer 3.

[0073] The specific combination of the coatings of Examples 1-2 and Comparative Examples 1-4 is shown in Table 2.

[0074] Wherein, the components of the primer 1-3 are as follows:

[0075] Primer 1: 50 parts of silicone modified polyaspartic acid ester primer resin A1, 32 parts of isocyanate curing agent ETP9011, 1 part of defoaming agent LD-2033, 1 part of leveling agent QM-3348, 1 part of wetting agent LD-8270, 1 part of coupling agent KH550;

[0076] Primer 2: 50 parts of silicone modified polyaspartic acid ester primer resin A1, 38 parts of isocyanate curing agent HT300, 1 part of defoaming agent LD-2033, 1 part of leveling agent QM-3348, 1 part of wetting agent LD-8270, 1 part of coupling agent KH550;

[0077] Primer 3: 50 parts of polyaspartic acid ester resin F330, 32 parts of isocyanate curing agent HT300, 1 part of defoaming agent LD-2033, 1 part of leveling agent QM-3348, 1 part of wetting agent LD-8270, and 1 part of coupling agent KH550.

[0078] The components of the middle layer coating 1-3 are as follows:

[0079] Middle layer coating 1: 50 parts of polyaspartic acid ester middle coating resin A2, 38 parts of isocyanate curing agent HT300, 15 parts of high-purity aluminum hydroxide, 10 parts of high-purity hollow glass microspheres, 5 parts of fumed silica, 10 parts of color paste, 1 part of defoaming agent LD-2033, 1 part of dispersant LD-124, 1 part of leveling agent QM-3348, 1 part of anti-settling agent LD-1411;

[0080] Middle layer coating 2: 50 parts of polyaspartic acid ester middle coating resin A2, 32 parts of isocyanate curing agent ETP9011, 15 parts of high-purity aluminum hydroxide, 10 parts of high-purity hollow glass microspheres, 5 parts of fumed silica, 10 parts of color paste, 1 part of defoaming agent LD-2033, 1 part of dispersant LD-124, 1 part of leveling agent QM-3348, 1 part of anti-settling agent LD-1411.

[0081] Middle layer coating 3: 50 parts of polyaspartic acid ester F420, 32 parts of isocyanate curing agent ETP9011, 15 parts of high-purity aluminum hydroxide, 10 parts of high-purity hollow glass microspheres, 5 parts of fumed silica, 10 parts of color paste, 1 part of defoaming agent LD-2033, 1 part of dispersant LD-124, 1 part of leveling agent QM-3348, 1 part of anti-settling agent LD-1411.

[0082] The components of the surface coating 1-3 are as follows:

[0083] Surface coating 1: 50 parts of imide-modified polyaspartic acid ester surface coating resin A3, 10 parts of isocyanate curing agent HT300, 22 parts of spherical alumina wear-resistant rigid particles, 1 part of defoamer LD-2033, 1 part of dispersant LD-124;

[0084] Surface coating 2: 65 parts of imide-modified polyaspartic acid ester surface coating resin A3, 15 parts of isocyanate curing agent HT300, 26 parts of spherical alumina wear-resistant rigid particles, 2 parts of defoaming agent LD-2033, and 2 parts of dispersant LD-124;

[0085] Surface coating 3: 50 parts of polyaspartic acid ester F5245, 25 parts of isocyanate curing agent HT300, 30 parts of spherical alumina wear-resistant rigid particles, 1 part of defoaming agent LD-2033, and 1 part of dispersant LD-124.

[0086] Table 2 Combination of coatings in Examples 1-2 and Comparative Examples 1-4

[0087] Primer Middle layer coating Surface coating Example 1 Base coating 1 Middle layer coating 1 Surface coating 1 Example 2 Basecoat 2 Middle layer coating 2 Surface coating 2 Comparative Example 1 Base coating 3 Middle layer coating 1 Surface coating 1 Comparative Example 2 Base coating 1 Middle layer coating 3 Surface coating 1 Comparative Example 3 Base coating 1 Middle layer coating 1 Surface coating 3 Comparative Example 4 Base coating 3 Middle layer coating 3 Surface coating 3

[0088] Effect Example 1

[0089] In order to explore the application performance of the floor system obtained by constructing the combined coating on the ground base in the embodiments of the present invention and the comparative examples, the following construction steps and performance tests were performed:

[0090] The floor system is constructed using the following method:

[0091] S1. Pre-treat the ground base by caulking, grinding, leveling and cleaning, then apply the primer in the combined coating on the ground base and cure for 3 hours to obtain a primer, with the coating thickness controlled at 0.3±0.1 mm;

[0092] S2, coating the middle layer coating in the combined coating on the upper surface of the cured base coating, curing for 4 hours to obtain a middle coating, and the coating thickness is controlled at 1.1±0.1mm;

[0093] S3. Grind the upper surface of the cured middle coating to a certain extent, then apply the topcoat in the combined coating and cure for 3 hours to obtain the topcoat. The coating thickness is controlled at 0.4±0.1mm to complete the construction of the floor system.

[0094] The structural schematic diagram of the floor system obtained by using the combined coating of modified polyaspartic acid ester in the embodiment is as follows: Figure 1 As shown, the meanings of the symbols in the accompanying drawings are as follows:

[0095] 1 - ground base, 2 - base coating, 3 - middle coating, 4 - top coating.

[0096] The completed floor system was tested for pencil hardness, tensile bond strength, waterproofness, wear resistance, elongation at break, tensile strength, compressive strength and yellowing resistance. The evaluation requirements and test results are shown in Table 3. The test methods for pencil hardness, tensile bond strength, waterproofness, wear resistance, elongation at break, tensile strength and compressive strength refer to GB / T22374-2018.

[0097] As can be seen from Table 3, the floor system obtained by using the combined coating based on modified polyaspartic acid ester provided by the present invention in Examples 1-2 has better comprehensive strength, hardness, impact resistance, weather resistance, wear resistance, yellowing resistance, and water resistance, and the combined coating scheme based on modified polyaspartic acid ester in Example 1 has the best relative effect;

[0098] The base coating of Comparative Example 1 uses polyaspartic acid resin F330 outside the specified range, the pencil hardness rating of the floor system coating decreases, the tensile bonding strength decreases significantly, the strength and bonding performance of the system deteriorate significantly, the coating is easier to fall off, and the overall performance is poor;

[0099] The middle layer coating of Comparative Example 2 uses polyaspartic acid ester F420 outside the limited range, the pencil hardness rating of the floor system coating decreases, the wear resistance deteriorates, the compressive strength and tensile strength are significantly reduced, and the elongation at break and yellowing resistance fail to meet the requirements. The comprehensive performance deteriorates significantly and cannot meet the requirements for long-term use in outdoor environments;

[0100] The surface coating of Comparative Example 3 uses polyaspartic acid ester F5245 outside the specified range. The pencil hardness rating of the floor system coating drops to HB, and the wear resistance is significantly deteriorated, and the yellowing resistance performance cannot meet the requirements. The comprehensive performance is significantly affected, the tolerance to the outdoor environment is deteriorated, and the service life is significantly shortened;

[0101] In Comparative Example 4, a polyaspartic acid ester-based coating combination outside the scope defined by the present invention is completely adopted. The hardness, adhesion, wear resistance, tensile strength and compressive strength of the floor system coating are significantly deteriorated, and the waterproofness, elongation at break and yellowing resistance all fail to meet the requirements. The overall performance is poor, the weather resistance is poor, the requirements for floor use in outdoor environments cannot be met, and the service life is short.

[0102] From the above, it can be seen that the combined coating based on modified polyaspartic acid ester provided by the present invention can form a solvent-free modified polyaspartic acid ester resin coating system after construction, which is highly safe and environmentally friendly, and has many excellent properties such as crack resistance, moisture resistance, yellowing resistance, high wear resistance, high strength, impact resistance, high stability, and long service life. It has high practical value and wide applicability.

[0103] Table 3 Coating properties of floor systems obtained by combined coating construction in the embodiments and comparative examples

[0104]

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A composite coating based on modified polyaspartic acid ester, characterized in that: It comprises a base coating, a middle coating and a surface coating; the base coating, the middle coating and the surface coating all comprise a component A and a component B, and the component B is an isocyanate curing agent; The component A of the bottom coating is an organosilicon-modified polyaspartic acid ester primer resin, and the organosilicon-modified polyaspartic acid ester primer resin conforms to the following general formula (I): wherein R and R1 are each independently selected from one of an alkyl group and an ether group, R2 is one of a C2-C4 alkyl group, and R3 is a methyl group or an ethyl group; The A component of the middle layer coating comprises a polyaspartic acid ester middle coating resin, and the polyaspartic acid ester middle coating resin conforms to the following general formula (II): wherein R4, R5, R6, and R7 are each independently selected from a methyl group, a dimethyl group, a hydrogen group, a C2-C4 alkyl group, and a cycloalkyl group; and R8 is a cycloalkyl group, an ether group, an ester group, a polyether group, a polyethylene glycol group, a C2-C 10 One of the alkyl groups; The A component of the surface coating comprises an imide-modified polyaspartic acid ester surface coating resin, and the imide-modified polyaspartic acid ester surface coating resin conforms to the following general formula (III): Wherein R9 is a long-chain alkyl or phenyl group, R 10 It is one of cyclohexyl, isophorone and phenyl.

2. The composite coating based on modified polyaspartic acid ester according to claim 1, characterized in that: The primer comprises the following components in parts by weight: 50-55 parts of silicone-modified polyaspartic acid ester primer resin, 30-40 parts of isocyanate curing agent, 1-2 parts of defoaming agent, 1-2 parts of leveling agent, 1-2 parts of wetting agent, and 1-2 parts of coupling agent; The middle layer coating comprises the following components in parts by weight: 50-55 parts of polyaspartic acid ester middle coating resin, 30-45 parts of isocyanate curing agent, 15-25 parts of aluminum hydroxide, 10-15 parts of hollow glass microspheres, 5-8 parts of fumed silica, 10-15 parts of color paste, 1-2 parts of defoaming agent, 1-2 parts of dispersant, 1-2 parts of leveling agent, and 1-2 parts of anti-settling agent; The surface coating comprises the following components in parts by weight: 50-65 parts of imide-modified polyaspartic acid ester surface coating resin, 10-15 parts of isocyanate curing agent, 20-30 parts of spherical aluminum oxide, 1-2 parts of defoaming agent, and 1-2 parts of dispersant.

3. The composite coating based on modified polyaspartic acid ester according to claim 2, characterized in that: The isocyanate curing agent is at least one of TAL100, TUL100, ETP9011, HT300, and HT100; The defoamer is one of LD-2033, AT-99, QM-2030B, HF-3019, and G-8600; The leveling agent is one of BESM-6001, BESM-6131, QM-3348, SA-795, BYK333, and BYK354; The wetting agent is one of LD-8270, Wet-8320, PW-336, and LP-380; The coupling agent is one of KH550, KH560 and KH602; The dispersant is one of QR-100, HP2019, CDI-187, NEO-1101, LD-124, and BESM-9101; The anti-settling agent is one of LD-1411, HR7022, MONENG-ASAS, and ANJEKA4320-20X.

4. The composite coating based on modified polyaspartic acid ester according to claim 3, characterized in that: The primer includes the following components in parts by weight: 50 parts of organosilicon-modified polyaspartic acid ester primer resin, 32 parts of isocyanate curing agent ETP9011, 1 part of defoaming agent LD-2033, 1 part of leveling agent QM-3348, 1 part of wetting agent LD-8270, and 1 part of coupling agent KH550; The middle layer coating comprises the following components in parts by weight: 50 parts of polyaspartic acid ester middle coating resin, 38 parts of isocyanate curing agent HT300, 15 parts of aluminum hydroxide, 10 parts of hollow glass microspheres, 5 parts of fumed silica, 10 parts of color paste, 1 part of defoaming agent LD-2033, 1 part of dispersant LD-124, 1 part of leveling agent QM-3348, and 1 part of anti-settling agent LD-1411; The surface coating comprises the following components in parts by weight: 50 parts of imide-modified polyaspartic acid ester surface coating resin, 10 parts of isocyanate curing agent HT300, 22 parts of spherical aluminum oxide, 1 part of defoaming agent LD-2033, and 1 part of dispersant LD-124.

5. The composite coating based on modified polyaspartic acid ester according to claim 1, characterized in that: The preparation method of the organosilicon-modified polyaspartic acid ester primer resin is as follows: The maleic anhydride and R-based diol are mixed for esterification reaction, R1-based monoalcohol is added for end-capping, and then aminosilane is added for catalytic reaction to obtain the organosilicon-modified polyaspartic acid ester primer resin.

6. The composite coating based on modified polyaspartic acid ester according to claim 1, characterized in that: The preparation method of the polyaspartic acid ester mid-coat resin is: Maleic anhydride and a monocyclic epoxy monomer are mixed for catalytic reaction to obtain maleic acid diol ester; the maleic acid diol ester is added to a divalent primary amine for reaction to obtain the polyaspartic acid ester mid-coat resin.

7. The composite coating based on modified polyaspartic acid ester according to claim 1, characterized in that: The preparation method of the imide-modified polyaspartic acid ester top coating resin is: The diamine and the antioxidant are mixed evenly, and maleimide compounds and methyl methacrylate are added in sequence for catalytic reaction to obtain the imide-modified polyaspartic acid ester top coating resin.

8. A floor system, characterized in that: The obtained product is obtained by applying the modified polyaspartic acid ester-based composite coating as described in any one of claims 1 to 7.

9. The construction method of the floor system according to claim 8, characterized in that: The following steps are involved: S1, applying the primer on the ground base, and curing for 2.5-3.5h to obtain a base coating; S2, coating the middle layer coating on the upper surface of the base coating, and curing for 3.5-4.5 hours to obtain a middle coating; S3, polishing the upper surface of the middle coating, applying the surface coating, curing for 2.5-3.5h, obtaining the surface coating, and completing the construction of the floor system.

10. The construction method of the floor system according to claim 9, characterized in that: The thickness of the primer layer is 0.2-0.4 mm, the thickness of the middle layer is 1.0-1.2 mm, and the thickness of the top layer is 0.3-0.6 mm.

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