A super wear-resistant polyurethane floor coating suitable for low temperature environments

Abstract

The present invention relates to a super wear-resistant polyurethane floor coating suitable for low temperature environment, belonging to the technical field of floor coating. It includes component A, component B and component C, and the weight ratio of the above three components is (4-6): (1.7-2.5): (2.5-3.5); component A is a low-viscosity aliphatic polyisocyanate curing agent; component B includes highly active modified castor oil polyol with high primary hydroxyl content, environmentally friendly solvent, leveling agent, substrate wetting agent, catalyst, defoaming agent; component C is a wear-resistant filler. After mixing components A, B and C in the above proportion, a floor coating with suitable surface drying time and curing time in a low temperature environment of 0°C or above can be obtained. At the same time, the coating has the characteristics of environmental protection, yellowing resistance, wear resistance, chemical resistance and anti-slip, which can meet various needs.

Description

Technical Field

[0001] The invention relates to a super wear-resistant polyurethane floor coating suitable for low-temperature environments, belonging to the technical field of floor coatings. Background Art

[0002] With the development of modern industrial production, all walks of life have higher and higher requirements for flooring, including cleanliness, wear resistance, heavy load resistance, chemical resistance, etc. Traditional inorganic cement flooring has been gradually eliminated due to its defects such as easy dusting and sanding, and organic floor coatings have become the mainstream. Epoxy floor coatings, as an early developed organic floor coating, can meet the high cleanliness required for use. At the same time, it occupies a large market share due to its long construction operation period and low cost. However, it has problems such as poor aging resistance, discoloration after long-term use, cannot be used outdoors, and is not resistant to high temperatures.

[0003] Polyurethane floor is a new generation of floor that replaces epoxy floor. It can make up for the above problems of epoxy floor coating. Thin-coated polyurethane floor paint can also be used as a topcoat for epoxy floor, reducing the maintenance and renovation costs of epoxy floor. Polyurethane floor coating is an organic polymer material containing urethane bonds or urea bonds synthesized by isocyanate and polyol or amino compound through gradual addition polymerization. The presence of polar groups such as urethane bonds / urea bonds can form a large number of reversible hydrogen bonds inside. This physical cross-linking structure will provide a dense network structure, so that the material has excellent mechanical strength and chemical resistance. At the same time, due to the unique microphase separation structure of polyurethane, it has excellent wear resistance. In addition, by selecting aliphatic isocyanates, yellowing-resistant floor materials that can be used outdoors can be obtained. Due to the strong advantages brought by the structural characteristics of polyurethane itself, it is particularly suitable for use in industrial environments with food hygiene, chemical corrosion, high temperature and humidity, water immersion and slippery, low temperature freezing, and heavy load and strong impact.

[0004] At present, polyurethane floor coatings are prone to high construction viscosity, prolonged surface drying and curing time or even non-curing when applied under low temperature conditions, especially below 10°C, which will greatly delay the construction progress; even if a catalyst is added below 5°C, it will not have much effect on accelerating the surface drying and curing of the material. Instead, it will accelerate the early gel time and shorten the construction operation period. Therefore, it is of great significance to develop a polyurethane floor coating suitable for low temperature conditions.

[0005] The invention application with publication number CN105273602A discloses a two-component low-temperature quick-drying floor material. The material is prepared by compounding mixed polyether polyols with different reaction rates as a film-forming substance, dispersing it with pigments, fillers, additives and solvents, and then mixing it with a curing agent in a ratio of 2:1. The product provided by the invention can be constructed at zero degrees and the surface is dry in 4 hours. However, toxic and hazardous chemicals such as xylene are used in the material, and the ether polyol structure is relatively soft, so the strength of the obtained floor material is relatively low.

[0006] The invention patent with announcement number CN102492360B discloses a solvent-free polyurethane wear-resistant floor coating and its preparation method, which consists of component A and component B. The main raw material of component A is solvent-free hydroxyl-terminated epoxy resin, and component B is solvent-free isocyanate-terminated prepolymer; its low-temperature curing property is mainly achieved by modifying solvent-free low-molecular liquid epoxy resin and diglycidyl ether with monoamine secondary amine to obtain solvent-free hydroxyl-terminated epoxy resin with viscosity of 300-500mPa·s, and the tertiary nitrogen atom on it has a catalytic effect on NCO group and OH group, thereby improving the low-temperature activity of the coating. However, the isocyanate used in component B in this method is a diphenylmethane diisocyanate polymer. The material synthesized by this type of isocyanate has poor color stability and is easy to yellow, which affects the appearance.

[0007] Therefore, it is urgent to design a polyurethane floor coating that can solve the above-mentioned technical problems Summary of the invention

[0008] The purpose of the present invention is to solve the shortcomings of the above-mentioned prior art and to provide a super wear-resistant polyurethane floor coating suitable for low-temperature environments, which can be constructed at zero degrees or above, and at the same time has the characteristics of being green and environmentally friendly, non-yellowing, wear-resistant, chemical-resistant, and non-slip, and can meet the application of various scenarios.

[0009] The invention discloses a super wear-resistant polyurethane floor coating suitable for low temperature environment, which is special in that it comprises component A, component B and component C, and the weight ratio of the three components is (4-6): (1.7-2.5): (2.5-3.5);

[0010] The component A is a low-viscosity aliphatic polyisocyanate curing agent;

[0011] The B component includes a highly active modified castor oil polyol with a high primary hydroxyl content, an environmentally friendly solvent, a leveling agent, a substrate wetting agent, a catalyst, and a defoaming agent;

[0012] The C component is a wear-resistant filler;

[0013] Preferably, the molar ratio of isocyanate in component A to hydroxyl group of polyol in component B is 2-3;

[0014] Preferably, the low-viscosity aliphatic polyisocyanate curing agent in component A is a hexamethylene diisocyanate trimer with an asymmetric structure, a viscosity of 200-700 mPa·s at 25° C., and an isocyanate mass fraction of 19.5%-20.5%;

[0015] Preferably, the high-activity modified castor oil polyol in the B component has a functionality of 3, a hydroxyl value of 370-410 mgKOH / g, and a viscosity of 700-1500 mPa·s at 25°C;

[0016] Preferably, the low-viscosity aliphatic isocyanate curing agent is hexamethylene diisocyanate trimer with a brand name of HT-300 produced by Wanhua Chemical Group Co., Ltd.; the high-activity modified castor oil polyol is a modified castor oil polyol with a primary hydroxyl content of ≥70%, and is a modified castor oil polyol with a brand name of A30 produced by Shanghai Jingri New Materials Technology Co., Ltd.;

[0017] Preferably, the environmentally friendly solvent is dibasic acid ester MDBE;

[0018] Preferably, the leveling agent is TEGO450 or TEGO370, which are polyether siloxane and polyacrylate leveling agents, respectively, and the weight ratio of TEGO370 to TEGO450 is 4:1;

[0019] Preferably, the substrate wetting agent is TEGO270;

[0020] Preferably, the catalyst is an organotin catalyst, which is Evonik Dabco T-12;

[0021] Preferably, the defoaming agent is AF-30 produced by Foshan Jieerjin New Materials;

[0022] Preferably, the wear-resistant filler of component C is 120-400 mesh white corundum with Mohs hardness>9;

[0023] Preferably, the weight proportion of the component A is (40-60) parts; the weight proportions of the components in the component B are: modified castor oil polyol (15-17) parts, MDBE (2-4) parts, leveling agent TEGO450, TEGO370 (0.1-0.5) parts, substrate wetting agent TEGO270 (0.1-0.5) parts, catalyst Dabco T-12 (0.01-0.03) parts, defoaming agent AF30 (0.4-0.6) parts;

[0024] The weight proportion of the C component is (25-35) parts.

[0025] The invention discloses a super wear-resistant polyurethane floor coating suitable for low temperature environment, and the beneficial effects are analyzed as follows:

[0026] The polyurethane floor coating of the present invention is designed to have an R value of 2-3. The final film-forming material is a mixture of polyurethane and polyurea generated by moisture curing of unreacted isocyanate trimer and moisture in the air. The two together form a paint film through physical cross-linking. The cross-linking structure and the presence of polyurea provide the paint film with better mechanical strength and wear resistance. The wear resistance is 0.0004g, which is much less than 0.03g required by the national standard GB / T22374-2018.

[0027] The polyurethane floor coating of the present invention uses an aliphatic isocyanate curing agent, which solves the problem of easy yellowing caused by the selection of a highly active aromatic isocyanate curing agent in the formula, and the selected aliphatic isocyanate curing agent is HT-300 with a low viscosity, which directly reduces the viscosity of the finished paint and solves the problem of increased viscosity during winter construction. Since the reactivity of aliphatic curing agents is low compared to aromatic curing agents, in order to solve the most important problems of reactivity and curing speed of materials at low temperatures, the present invention uses a modified castor oil polyol with a primary hydroxyl content of more than 70%. It is found in experiments that HT-300 has the most suitable operating time and curing speed when used with such highly active modified castor oil polyols, and can achieve normal curing of polyurethane coatings at 0°C and above. Therefore, the present invention uses such modified castor oil polyols directly with HT-300 to simultaneously solve the problems of curing speed at low temperatures and viscosity during construction, and the purpose can be achieved without compounding a variety of polyols with different activities. In addition, the selected modified castor oil polyol is a bio-based material, and the raw materials are easily renewable and meet the requirements of sustainable development. It has better water resistance than polyester polyols and higher strength than polyether polyols, and even has the advantages of both types of polyols, and has a very high cost performance. In order to improve the leveling of the paint film, the long-wave leveling agent TEGO370 and the short-wave leveling agent TEGO450 are used in combination, and the present invention finds that the best leveling effect is achieved when the ratio of the long-wave leveling agent to the short-wave leveling agent is 4:1. The function of the C component with high Mohs hardness is mainly to improve the scratch resistance of the paint film, and the C components of different mesh sizes can be used to control the thickness of the paint film, the amount of paint used, and the surface roughness of the paint film, so as to meet different needs.

[0028] In addition, the polyurethane floor coating of the present invention also has the following characteristics: the coating can achieve good adhesion when used in combination with a variety of systems, and the bonding strength can be above 4Mpa; the overall raw materials of the formula are green and environmentally friendly; and there are no structures such as benzene rings that are prone to yellowing in the raw materials. The final coating also has the characteristic of not changing color after long-term use, and can be used outdoors and in other scenes with high requirements for color difference and color retention. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] The ultra-wear-resistant polyurethane floor coating suitable for low-temperature environments of this embodiment includes the following raw materials in parts by weight:

[0032] Component A: HT-300: 50 parts

[0033] The composition of component B is shown in the following table:

[0034] Raw material ingredients Number of copies Modified castor oil polyol A30 15 MDBE 4 TEGO370 0.2 TEGO450 0.05 TEGO270 0.25 T-12 0.02 AF-30 0.48

[0035] Mix component B evenly by mechanical stirring and then put it into barrel for later use.

[0036] Component C: 30 parts of 220 mesh white corundum

[0037] When used, components A, B, and C are uniformly stirred mechanically in a mass ratio of 5:2:3, and are uniformly coated on glass sheets and non-asbestos fiber cement boards by scraping first and then rolling to obtain the product. The product performance indicators are shown in Table 1.

[0038] Example 2

[0039] The ultra-wear-resistant polyurethane floor coating suitable for low-temperature environments of this embodiment includes the following raw materials in parts by weight:

[0040] Component A: HT-300: 60 parts

[0041] The composition of component B is shown in the following table:

[0042] Raw material ingredients Number of copies Modified castor oil polyol A30 15 MDBE 4 TEGO370 0.2 TEGO450 0.05 TEGO270 0.25 T-12 0.02 AF-30 0.48

[0043] Mix component B evenly by mechanical stirring and then put it into barrel for later use.

[0044] Component C: 30 parts of 220 mesh white corundum

[0045] When used, components A, B, and C are uniformly stirred mechanically in a mass ratio of 6:2:3, and are uniformly coated on glass sheets and non-asbestos fiber cement boards by scraping first and then rolling to obtain the product. The product performance indicators are shown in Table 1.

[0046] Example 3

[0047] The ultra-wear-resistant polyurethane floor coating suitable for low-temperature environments of this embodiment includes the following raw materials in parts by weight:

[0048] Component A: HT-300: 60 parts

[0049] The composition of component B is shown in the following table:

[0050]

[0051]

[0052] Mix component B evenly by mechanical stirring and then put it into barrel for later use.

[0053] Component C: 30 parts of 220 mesh white corundum.

[0054] When used, components A, B, and C are uniformly stirred mechanically in a mass ratio of 6:2:3, and are uniformly coated on glass sheets and non-asbestos fiber cement boards by scraping first and then rolling to obtain the product. The product performance indicators are shown in Table 1.

[0055] Example 4

[0056] The ultra-wear-resistant polyurethane floor coating suitable for low-temperature environments of this embodiment includes the following raw materials in parts by weight:

[0057] Component A: HT-300: 60 parts

[0058] The composition of component B is shown in the following table:

[0059]

[0060]

[0061] Mix component B evenly by mechanical stirring and then put it into barrel for later use.

[0062] Component C: 30 parts of 400 mesh white corundum.

[0063] When used, components A, B, and C are uniformly stirred mechanically in a mass ratio of 6:2:3, and are uniformly coated on glass sheets and non-asbestos fiber cement boards by scraping first and then rolling to obtain the product. The product performance indicators are shown in Table 1.

[0064] Example 5

[0065] The ultra-wear-resistant polyurethane floor coating suitable for low-temperature environments of this embodiment includes the following raw materials in parts by weight:

[0066] Component A: HT-300: 50 parts

[0067] The composition of component B is shown in the following table:

[0068] Raw material ingredients Number of copies Modified castor oil polyol A30 15 MDBE 4 TEGO370 0.2 TEGO450 0.05 TEGO270 0.25 T-12 0.02 AF-30 0.48

[0069] Mix component B evenly by mechanical stirring and then put it into barrel for later use.

[0070] Component C: 35 parts of 220 mesh white corundum.

[0071] When used, components A, B, and C are uniformly stirred mechanically in a mass ratio of 5:2:3.5, and are uniformly coated on glass sheets and non-asbestos fiber cement boards by scraping first and then rolling to obtain the product. The product performance indicators are shown in Table 1.

[0072] Comparative Example 1

[0073] This comparative example includes the following raw materials in parts by weight:

[0074] Component A: HT-300: 50 parts

[0075] The composition of component B is shown in the following table:

[0076] Raw material ingredients Number of copies Modified castor oil polyol A4105 15 MDBE 4 TEGO370 0.2 TEGO450 0.05 TEGO270 0.25 T-12 0.02 AF-30 0.48

[0077] Mix component B evenly by mechanical stirring and then put it into barrel for later use.

[0078] Component C: 30 parts of 220 mesh white corundum

[0079] When used, components A, B, and C are uniformly stirred mechanically in a mass ratio of 6:2:3, and are uniformly coated on glass sheets and non-asbestos fiber cement boards by scraping first and then rolling to obtain the product. The product performance indicators are shown in Table 1.

[0080] Table 1: Basic performance index table of products obtained in Examples 1-4

[0081]

[0082]

[0083] Examples 1-5 are all floor paints using HT-300 and modified castor oil polyol A30 with high primary hydroxyl content. The main differences are the amount of component A (Examples 1 and 2), the amount of modified castor oil polyol (Examples 2 and 3), the mesh size of white corundum (Examples 2 and 4), and the amount of white corundum (Examples 1 and 5). From the test results, the examples of each ratio can achieve good curing at 0°C and above, and have a shorter surface drying time than the comparative example; the pencil hardness test can reflect the degree of curing to a certain extent. When A30 is used as a polyol, the strength is faster, and it can reach 6H in 3 days at around zero degrees. At this time, it can be used normally, and it can reach 7H in seven days, while the test result of comparative example 1 after seven days is still 4H. Therefore, the examples are far better than the comparative example in terms of curing speed and self-strength after curing. In addition, the wear resistance of the examples is also better than that of the comparative example.

[0084] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiment, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiment, or to replace part of them with equivalents. Although the above describes the specific implementation of the present invention, it is not intended to limit the protection scope of the present invention. A person skilled in the art should understand that, based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the protection scope of the present invention.

Claims

1. A super wear-resistant polyurethane floor coating suitable for low temperature environment, characterized in that It comprises component A, component B and component C, wherein the weight ratio of the three components is (4-6): (1.7-2.5): (2.5-3.5); The component A is a low-viscosity aliphatic polyisocyanate curing agent; The B component includes a highly active modified castor oil polyol with a high primary hydroxyl content, an environmentally friendly solvent, a leveling agent, a substrate wetting agent, a catalyst, and a defoaming agent; The C component is a wear-resistant filler; The high-activity modified castor oil polyol in the B component has a functionality of 3, a hydroxyl value of 370-410 mgKOH / g, and a viscosity of 700-1500 mPa·s at 25° C.; The environmentally friendly solvent is dibasic acid ester MDBE; The leveling agents are TEGO450 and TEGO370, which are polyether siloxane and polyacrylate leveling agents, respectively, and the weight ratio of TEGO370 to TEGO450 is 4:1; The substrate wetting agent is TEGO270; The catalyst is an organotin catalyst, which is Evonik Dabco T-12; The defoamer is AF-30 produced by Foshan Jieerjin New Materials; The wear-resistant filler of component C is 120-400 mesh white corundum with Mohs hardness>9; The molar ratio of isocyanate in component A to hydroxyl group of polyol in component B is 2-3; The low-viscosity aliphatic polyisocyanate curing agent in component A is a hexamethylene diisocyanate trimer with an asymmetric structure, a viscosity of 200-700 mPa·s at 25° C., and an isocyanate mass fraction of 19.5%-20.5%.

2. A super wear-resistant polyurethane floor coating suitable for low temperature environment according to claim 1, characterized in that The low-viscosity aliphatic isocyanate curing agent adopts hexamethylene diisocyanate trimer with the brand name HT-300 produced by Wanhua Chemical Group Co., Ltd.; the high-activity modified castor oil polyol adopts modified castor oil polyol with a primary hydroxyl content of ≥70%, and adopts modified castor oil polyol with the brand name A30 produced by Shanghai Jingri New Materials Technology Co., Ltd.

3. The ultra-wear-resistant polyurethane floor coating suitable for low-temperature environments according to claim 1, characterized in that The weight proportion of the component A is (40-60) parts; the weight proportions of the components in the component B are: modified castor oil polyol (15-17) parts, MDBE (2-4) parts, leveling agent TEGO450, TEGO370 (0.1-0.5) parts, substrate wetting agent TEGO270 (0.1-0.5) parts, catalyst Dabco T-12 (0.01-0.03) parts, defoaming agent AF30 (0.4-0.6) parts; The weight proportion of the C component is (25-35) parts.

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