High-strength impact-resistant and weather-resistant polyurethane floor coating and preparation method thereof

Abstract

This invention belongs to the technical field of polyurethane coatings, specifically relating to a high-strength, impact-resistant, and weather-resistant polyurethane floor coating and its preparation method. It is prepared from component A and component B in a mass ratio of (2.5-3):1. Component A comprises the following raw materials: soybean oil-based polyester polyol, modified castor oil polyol, plasticizer, inorganic filler, color paste, additives, and a catalyst. Component B comprises the following raw materials: an aliphatic diisocyanate, polytetramethylene ether glycol, and an isocyanate trimer. The additives are a mixture of a dispersant, a defoamer, a rheological additive, a light stabilizer, a UV absorber, and a leveling agent. The resulting floor coating exhibits excellent weather resistance, combining high strength and hardness while maintaining a certain degree of flexibility, making it particularly suitable for tile renovation and floor construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyurethane coatings, and in particular relates to a high-strength, impact-resistant and weather-resistant polyurethane floor coating and a preparation method thereof. Background Art

[0002] Currently, polyurethane floor coatings used for flooring or tile renovation suffer from poor yellowing resistance and are prone to oxidation, which degrades performance. Sunlight accelerates yellowing, requiring a second layer of weathering coating, which increases both the process and costs. Furthermore, the material has a short service life and high maintenance costs.

[0003] Polyurethane floor coatings are also widely used in industrial flooring, but existing polyurethane floor coatings still have many shortcomings. In terms of physical properties, they struggle to achieve a perfect balance of strength, hardness, and toughness. In areas such as machining and heavy-load transportation, floors are susceptible to damage from the impact of heavy objects falling from the air due to insufficient toughness. Alternatively, they can crack under the pressure of heavy vehicles due to insufficient strength and hardness.

[0004] Therefore, developing a polyurethane floor coating with excellent weather resistance, high strength, high hardness and a certain flexibility is of great practical significance for solving the problems of existing floor coatings and meeting the actual needs of tile renovation and floor construction. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a high-strength, impact-resistant and weather-resistant polyurethane floor coating. The floor coating has excellent weather resistance properties. While having high strength and high hardness, it can still maintain a certain flexibility and is particularly suitable for tile renovation and floor construction scenarios.

[0006] Another object of the present invention is to provide a method for preparing a high-strength, impact-resistant and weather-resistant polyurethane floor coating, which is scientific, reasonable, simple and easy to implement.

[0007] The technical solutions adopted by the present invention are as follows:

[0008] The high-strength, impact-resistant and weather-resistant polyurethane floor coating is made of component A and component B in a mass ratio of (2.5-3):1, wherein:

[0009] Component A includes the following raw materials in parts by weight:

[0010] Soybean oil-based polyester polyol: 15-25 parts;

[0011] Modified castor oil polyol: 20-30 parts;

[0012] Plasticizer: 3~5 parts;

[0013] Inorganic filler: 44-47 parts;

[0014] Color paste: 2~5 parts;

[0015] Additives: 2~3 parts;

[0016] Catalyst: 0.1~0.2 parts;

[0017] Component B includes the following raw materials in parts by weight:

[0018] Aliphatic diisocyanate: 57-65 parts;

[0019] Polytetramethylene ether glycol: 18-28 parts;

[0020] Isocyanate trimer: 15-18 parts;

[0021] The soybean oil-based polyester polyol has a functionality of 2.0 and a hydroxyl value of 225-235 mgKOH / g;

[0022] The modified castor oil polyol has a functionality of 3.5 and a hydroxyl value of 245-275 mgKOH / g;

[0023] The functionality of the polytetramethylene ether glycol is 2.0, and the hydroxyl value is 109.5-115.1 mgKOH / g.

[0024] The soybean oil-based polyester polyol is Naxipol-SA2152, purchased from Zhuochuang Na New Materials (Cangzhou) Co., Ltd., and an isocyanurate ring structure is introduced into its molecular structure as a hard segment, and is copolymerized with a dimer acid flexible chain segment, which significantly improves the hardness of the material while maintaining the toughness of the material; the modified castor oil polyol is CF-260T, purchased from Qingdao Ruinuo Chemical Co., Ltd., which introduces high-density hydroxyl groups into the castor oil molecular structure through polyhydroxy functionalization modification technology, realizes three-dimensional reconstruction of the molecular structure, and can promote the formation of a denser cross-linked network between the material molecules.

[0025] The plasticizer is chlorinated paraffin; and the inorganic filler is one or more of silicon micropowder, barium sulfate or glass powder.

[0026] The auxiliary agent is a mixture of a dispersant, a defoamer, a rheological auxiliary agent, a light stabilizer, an ultraviolet absorber and a leveling agent.

[0027] The defoaming agent is preferably Defom 6800, purchased from Deqian (Shanghai) Chemical Co., Ltd.

[0028] The dispersant is preferably TEGO Dispers 655, purchased from German Digo Chemical.

[0029] The light stabilizer is preferably UNIQLIGHT 992, purchased from UNIQLIGHT Chemical (Shanghai) Co., Ltd.

[0030] The ultraviolet absorber is preferably UNIQLIGHT 930, purchased from UNIQLIGHT (Shanghai) Co., Ltd.

[0031] The leveling agent is preferably DISPARLON L-1983N, which is purchased from Kusumoto Chemicals Co., Ltd.

[0032] The rheological additive is preferably BYK-410, purchased from BYK Chemie, Germany.

[0033] The color paste is an oily color paste purchased from Mingguang Kedina Micro New Materials Co., Ltd.

[0034] The catalyst is an organotin catalyst, preferably dibutyltin dilaurate produced by Evonik Specialty Chemicals (Shanghai) Co., Ltd.

[0035] The aliphatic diisocyanate is isophorone diisocyanate.

[0036] The polytetrahydrofuran ether glycol is PolyTHF 1000 produced by BASF Group of Germany.

[0037] The isocyanate trimer is hexamethylene diisocyanate trimer.

[0038] The preparation method of the high-strength impact-resistant and weather-resistant polyurethane floor coating comprises the following steps:

[0039] (1) Mixing soybean oil-based polyester polyol, modified castor oil polyol, plasticizer, inorganic filler and dispersant, vacuum dehydrating and cooling, adding color paste, defoaming agent, rheological additive, light stabilizer, ultraviolet absorber, leveling agent and catalyst to prepare component A;

[0040] (2) vacuum dehydrating the polytetramethylene glycol and cooling the mixture, adding an aliphatic diisocyanate to carry out a first-stage reaction until the -NCO content is 19-23.8 wt.%, adding an isocyanate trimer to carry out a second-stage reaction until the -NCO content is 22.3-27.5 wt.%, and obtaining component B;

[0041] (3) When using, mix component A and component B in a mass ratio of (2.5~3):1, apply it on the base layer, and after curing, you will get a high-strength, impact-resistant and weather-resistant polyurethane floor coating.

[0042] In the step (1), the temperature after cooling is 50-60°C; in the step (2), the temperature of the first stage reaction is 100-110°C, and the temperature of the second stage reaction is 70-80°C.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] (1) The present invention significantly improves the material's resistance to UV oxidation and yellowing by selecting raw materials that do not contain yellowing-prone groups and compounding them with light stabilizers and UV absorbers. It is less likely to powder or discolor under sunlight, thus extending its outdoor service life. Furthermore, the present invention uses bio-based raw materials, which is more environmentally friendly and suitable for indoor or enclosed spaces.

[0045] (2) The present invention promotes the formation of a dense cross-linked network by adopting a high-functionality modified polyol and an isocyanurate ring structure. Combined with the introduction of an isocyanate trimer, the material achieves high strength and hardness while maintaining good toughness through the rational adjustment of the flexible chain segments. This excellent balance of strength, hardness, and toughness significantly improves the floor's impact resistance and resistance to rolling cracking, significantly extending its service life and reducing maintenance costs.

[0046] (3) The present invention optimizes the design of a specific polyol combination and a curing agent system to achieve a two-component system with moderate viscosity and convenient mixing and construction operations. This system has a wide adaptability to construction temperatures and effectively solves the problems of difficult construction and poor curing of water-based and epoxy floors in low-temperature environments. DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to the following examples, but they do not limit the implementation of the present invention.

[0048] Unless otherwise specified, the raw materials used in the examples and comparative examples are conventional commercially available raw materials, and the process methods used in the examples and comparative examples are conventional methods in the art unless otherwise specified.

[0049] Example 1

[0050] The high-strength, impact-resistant and weather-resistant polyurethane floor coating is made of component A and component B in a mass ratio of 2.5:1, wherein:

[0051] Component A includes the following raw materials in parts by weight:

[0052] Soybean oil-based polyester polyol Naxipol-SA2152: 15 parts;

[0053] Modified castor oil polyol CF-260T: 30 parts;

[0054] Chlorinated paraffin: 5 parts;

[0055] Inorganic filler: 44.9 parts;

[0056] Oil-based color paste: 2.6 parts;

[0057] Additives: 2.4 parts;

[0058] Dibutyltin dilaurate: 0.1 part;

[0059] Component B includes the following raw materials in parts by weight:

[0060] Isophorone diisocyanate: 57 parts;

[0061] Polytetramethylene glycol PolyTHF 1000: 28 parts;

[0062] Hexamethylene diisocyanate trimer: 15 parts;

[0063] The inorganic filler is a mixture of 30 parts of silicon micropowder and 14.9 parts of barium sulfate; the additive is a mixture of 0.5 parts of dispersant TEGO Dispers 655, 0.5 parts of defoamer Defom 6800, 0.2 parts of rheological additive BYK-410, 0.3 parts of light stabilizer UNIQLIGHT 992, 0.3 parts of ultraviolet absorber UNIQLIGHT 930 and 0.6 parts of leveling agent DISPARLON L-1983N.

[0064] The preparation method of the high-strength, impact-resistant and weather-resistant polyurethane floor coating comprises the following steps:

[0065] (1) Soybean oil-based polyester polyol Naxipol-SA2152, modified castor oil polyol CF-260T, plasticizer, inorganic filler and dispersant were mixed, heated to 95±5°C, vacuum dehydrated, cooled to 55±5°C, and color paste, defoamer, rheological additive, light stabilizer, ultraviolet absorber, leveling agent and catalyst were added and mixed uniformly to prepare component A;

[0066] (2) Polytetrahydrofuran ether diol PolyTHF 1000 was vacuum dehydrated at 82.5±2.5℃ for 2h, then cooled to 67.5±2.5℃, and aliphatic diisocyanate was added. The first stage reaction was carried out at 105℃ for 5h until the -NCO content reached 19.5wt.%. Isocyanate trimer was added and the second stage reaction was carried out at 80℃ for 0.5h until the -NCO content reached 22.8wt.%, thereby obtaining component B.

[0067] (3) When using, mix component A and component B in a mass ratio of 2.5:1, apply it on the base layer with a thickness of 1.5 mm, and cure it at 25°C for 24 hours to obtain a high-strength, impact-resistant and weather-resistant polyurethane floor coating.

[0068] Example 2

[0069] The high-strength, impact-resistant and weather-resistant polyurethane floor coating is made of component A and component B in a mass ratio of 3:1, wherein:

[0070] Component A includes the following raw materials in parts by weight:

[0071] Soybean oil-based polyester polyol Naxipol-SA2152: 20 parts;

[0072] Modified castor oil polyol CF-260T: 25 parts;

[0073] Chlorinated paraffin: 3 parts;

[0074] Inorganic filler: 44.5 parts;

[0075] Oil-based color paste: 5 parts;

[0076] Additives: 2.3 parts;

[0077] Dibutyltin dilaurate: 0.2 parts;

[0078] Component B includes the following raw materials in parts by weight:

[0079] Isophorone diisocyanate: 65 parts;

[0080] Polytetramethylene glycol PolyTHF 1000: 18 parts;

[0081] Hexamethylene diisocyanate trimer: 17 parts;

[0082] The inorganic filler is a mixture of 30 parts of silicon micropowder and 14.5 parts of barium sulfate; the additive is a mixture of 0.5 parts of dispersant TEGO Dispers 655, 0.4 parts of defoamer Defom 6800, 0.2 parts of rheological additive BYK-410, 0.3 parts of light stabilizer UNIQLIGHT 992, 0.3 parts of ultraviolet absorber UNIQLIGHT 930 and 0.6 parts of leveling agent DISPARLON L-1983N.

[0083] The preparation method of the high-strength, impact-resistant and weather-resistant polyurethane floor coating comprises the following steps:

[0084] (1) Soybean oil-based polyester polyol Naxipol-SA2152, modified castor oil polyol CF-260T, plasticizer, inorganic filler and dispersant were mixed, heated to 95±5°C, vacuum dehydrated, cooled to 55±5°C, and color paste, defoamer, rheological additive, light stabilizer, ultraviolet absorber, leveling agent and catalyst were added and mixed uniformly to prepare component A;

[0085] (2) Polytetrahydrofuran ether diol PolyTHF 1000 was vacuum dehydrated at 82.5±2.5℃ for 2h, then cooled to 67.5±2.5℃, and aliphatic diisocyanate was added. The first stage reaction was carried out at 105℃ for 5h until the -NCO content reached 23.3wt.%. Isocyanate trimer was added and the second stage reaction was carried out at 80℃ for 0.5h until the -NCO content reached 27wt.%, thereby obtaining component B.

[0086] (3) When using, mix component A and component B in a mass ratio of 3:1, apply it on the base layer with a thickness of 1.5 mm, and cure it at 25°C for 24 hours to obtain a high-strength, impact-resistant and weather-resistant polyurethane floor coating.

[0087] Example 3

[0088] The high-strength, impact-resistant and weather-resistant polyurethane floor coating is made of component A and component B in a mass ratio of 2.7:1, wherein:

[0089] Component A includes the following raw materials in parts by weight:

[0090] Soybean oil-based polyester polyol Naxipol-SA2152: 25 parts;

[0091] Modified castor oil polyol CF-260T: 20 parts;

[0092] Chlorinated paraffin: 3 parts;

[0093] Inorganic filler: 46.7 parts;

[0094] Oil-based color paste: 3 parts;

[0095] Additives: 2.1 parts;

[0096] Dibutyltin dilaurate: 0.2 parts;

[0097] Component B includes the following raw materials in parts by weight:

[0098] Isophorone diisocyanate: 59 parts;

[0099] Polytetramethylene glycol PolyTHF 1000: 23 parts;

[0100] Hexamethylene diisocyanate trimer: 18 parts;

[0101] The inorganic filler is a mixture of 31.7 parts of silicon micropowder and 15 parts of barium sulfate; the additive is a mixture of 0.5 parts of dispersant TEGO Dispers 655, 0.5 parts of defoamer Defom 6800, 0.2 parts of rheological additive BYK-410, 0.2 parts of light stabilizer UNIQLIGHT 992, 0.2 parts of UV absorber UNIQLIGHT 930 and 0.5 parts of leveling agent DISPARLON L-1983N.

[0102] The preparation method of the high-strength impact-resistant and weather-resistant polyurethane floor coating comprises the following steps:

[0103] (1) Soybean oil-based polyester polyol Naxipol-SA2152, modified castor oil polyol CF-260T, plasticizer, inorganic filler and dispersant were mixed, heated to 95±5°C, vacuum dehydrated, cooled to 55±5°C, and color paste, defoamer, rheological additive, light stabilizer, ultraviolet absorber, leveling agent and catalyst were added and mixed uniformly to prepare component A;

[0104] (2) Polytetrahydrofuran ether diol PolyTHF 1000 was vacuum dehydrated at 82.5±2.5℃ for 2h, then cooled to 67.5±2.5℃, and aliphatic diisocyanate was added. The first stage reaction was carried out at 105℃ for 5h until the -NCO content reached 20.7wt.%. Isocyanate trimer was added and the second stage reaction was carried out at 80℃ for 0.5h until the -NCO content reached 24.5wt.%, thereby obtaining component B.

[0105] (3) When using, mix component A and component B in a mass ratio of 2.7:1, apply it on the base layer with a thickness of 1.5 mm, and cure it at 25°C for 24 hours to obtain a high-strength, impact-resistant and weather-resistant polyurethane floor coating.

[0106] Comparative Example 1

[0107] The difference from Example 3 is that in component A, SOVERMOL produced by BASF Group of Germany is used in equal weight. ® 908 replaces soybean oil-based polyester polyol Naxipol-SA2152, and the rest is the same as in Example 3.

[0108] Comparative Example 2

[0109] The difference from Example 3 is that in component A, SOVERMOL produced by BASF Group of Germany is used in equal weight. ® 1102 replaces the modified castor oil polyol CF-260T, and the rest are the same as in Example 3.

[0110] Comparative Example 3

[0111] The difference from Example 3 is that in component B, PM-200 produced by Wanhua Chemical Group Co., Ltd. is used in an equal weight to replace hexamethylene diisocyanate trimer, and the rest is the same as Example 3.

[0112] With reference to GB / T 22374-2018, the performance tests of the floor coatings prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were respectively carried out, wherein the impact resistance (1000g steel ball, cm) is expressed as: when a steel ball with a mass of 1000g is freely dropped from a certain height to impact the polyurethane floor coating, the maximum height that the material surface can withstand without damage, cracks, peeling, etc., and the unit is cm.

[0113] The test results are shown in Table 1:

[0114] Table 1 Performance test results

[0115]

[0116] It can be seen from the data in Table 1 that the floor coatings prepared in Examples 1 to 3 have high strength, toughness, good crack resistance and impact resistance, and exhibit excellent weather resistance and aging resistance.

[0117] In Comparative Example 1, since soybean oil-based polyester polyol containing an isocyanurate ring structure is not used, its molecular structure lacks sufficient rigid segments; this leads to a decrease in the overall hard segment content of the material, which in turn causes a significant decrease in tensile strength and hardness.

[0118] In Comparative Example 2, since high-functionality modified castor oil polyol was not used, the molecular structure lacked high-density hydroxyl groups, and effective molecular stereo reconstruction could not be achieved; this resulted in insufficient density of the material's cross-linked network, which in turn caused a decrease in tensile strength and significantly low hardness.

[0119] In Comparative Example 3, due to the use of aromatic isocyanate, the surface color of the prepared floor coating faded severely in the artificial weathering aging resistance test, showing the characteristics of not being resistant to weathering and aging. This shows that the application of hexamethylene diisocyanate trimer in the present invention can significantly improve the weather resistance and aging resistance of the floor coating.

Claims

1. A high-strength, impact-resistant and weather-resistant polyurethane floor coating, characterized in that: It is made of component A and component B in a mass ratio of (2.5~3):1, wherein, Component A includes the following raw materials in parts by weight: Soybean oil-based polyester polyol: 15-25 parts; Modified castor oil polyol: 20-30 parts; Plasticizer: 3~5 parts; Inorganic filler: 44-47 parts; Color paste: 2~5 parts; Additives: 2~3 parts; Catalyst: 0.1~0.2 parts; Component B includes the following raw materials in parts by weight: Aliphatic diisocyanate: 57-65 parts; Polytetramethylene ether glycol: 18-28 parts; Isocyanate trimer: 15-18 parts; The soybean oil-based polyester polyol is Naxipol-SA2152, with a functionality of 2.0 and a hydroxyl value of 225-235 mgKOH / g; The modified castor oil polyol is CF-260T, with a functionality of 3.5 and a hydroxyl value of 245-275 mgKOH / g; The functionality of the polytetramethylene ether glycol is 2.0, and the hydroxyl value is 109.5-115.1 mgKOH / g.

2. The high-strength, impact-resistant and weather-resistant polyurethane floor coating according to claim 1, characterized in that: The plasticizer is chlorinated paraffin; and the inorganic filler is one or more of silicon micropowder, barium sulfate or glass powder.

3. The high-strength, impact-resistant and weather-resistant polyurethane floor coating according to claim 1, characterized in that: The auxiliary agent is a mixture of a dispersant, a defoamer, a rheological auxiliary agent, a light stabilizer, an ultraviolet absorber and a leveling agent.

4. The high-strength, impact-resistant and weather-resistant polyurethane floor coating according to claim 1, characterized in that: The color paste is an oily color paste; and the catalyst is an organic tin catalyst.

5. The high-strength, impact-resistant and weather-resistant polyurethane floor coating according to claim 1, characterized in that: The aliphatic diisocyanate is isophorone diisocyanate.

6. The high-strength, impact-resistant and weather-resistant polyurethane floor coating according to claim 1, characterized in that: Described polytetrahydrofuran ether glycol is PolyTHF 1000.

7. The high-strength, impact-resistant and weather-resistant polyurethane floor coating according to claim 1, characterized in that: The isocyanate trimer is hexamethylene diisocyanate trimer.

8. A method for preparing the high-strength, impact-resistant and weather-resistant polyurethane floor coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Mixing soybean oil-based polyester polyol, modified castor oil polyol, plasticizer, inorganic filler and dispersant, vacuum dehydrating and cooling, adding color paste, defoaming agent, rheological additive, light stabilizer, ultraviolet absorber, leveling agent and catalyst to prepare component A; (2) vacuum dehydrating the polytetramethylene glycol and cooling the mixture, adding an aliphatic diisocyanate to carry out a first-stage reaction until the -NCO content is 19-23.8 wt.%, adding an isocyanate trimer to carry out a second-stage reaction until the -NCO content is 22.3-27.5 wt.%, and obtaining component B; (3) When using, mix component A and component B, apply them on the base layer, and after curing, you will get a high-strength, impact-resistant and weather-resistant polyurethane floor coating.

9. The method for preparing the high-strength, impact-resistant and weather-resistant polyurethane floor coating according to claim 8, characterized in that: In the step (1), the temperature after cooling is 50-60°C; in the step (2), the temperature of the first stage reaction is 100-110°C, and the temperature of the second stage reaction is 70-80°C.

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