Wear-resistant epoxy modified polyurethane floor coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, in particular to a wear-resistant epoxy modified polyurethane floor coating and a preparation method thereof. The invention relates to a wear-resistant epoxy modified polyurethane floor coating, which comprises a component A and a component B. The component A is prepared from polyether polyol and hexamethylene diisocyanate polyisocyanate through a reaction. The component B is prepared from epoxy resin, polyaspartic acid resin, dipolyglycerol sesquioctoate, a silane coupling agent, ethylene glycol monobutyl ether acetate, a polysiloxane compound, organic polymer modified dimethyl siloxane, triethylene glycol di-2-ethylhexoate, pigment, filler, silicon dioxide, an ultraviolet absorbent and color paste. According to the application, the epoxy resin is introduced, and the hexamethylene diisocyanate polyisocyanate and the polyaspartic acid resin are used, so that the weather resistance of the polyurethane floor coating is remarkably enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a wear-resistant epoxy-modified polyurethane floor coating and a preparation method thereof. Background Art

[0002] Floor coatings are widely used in industrial and commercial places, such as factory workshops, warehouses, parking lots, shopping malls, etc., to provide a wear-resistant, corrosion-resistant, easy-to-clean and maintain floor. However, with the continuous improvement of floor performance requirements in modern production and life, traditional solvent-based epoxy coatings have gradually failed to meet market demand. In recent years, polyurethane materials have been widely used in the field of floor coatings due to their excellent physical and chemical properties. Polyurethane floor coatings have good mechanical properties. However, due to the presence of more ester bonds in the polyurethane molecular chain, these ester bonds are easily hydrolyzed and degraded under the action of water and ultraviolet rays. Therefore, the weather resistance and hydrolysis resistance of polyurethane floor coatings are relatively poor.

[0003] Therefore, developing an epoxy-modified polyurethane floor coating with stronger weather resistance has become an important research direction in the coatings industry. Summary of the invention

[0004] In order to develop an epoxy-modified polyurethane floor coating with stronger weather resistance, the present application proposes an epoxy-modified polyurethane floor coating. The present application introduces epoxy resin and significantly enhances the weather resistance of the polyurethane floor coating by using hexamethylene diisocyanate-based polyisocyanate and polyaspartic acid resin.

[0005] In the first aspect, the present application provides a wear-resistant epoxy-modified polyurethane floor coating adopts the following technical scheme: a wear-resistant epoxy-modified polyurethane floor coating, comprising component A and component B, wherein component A is prepared from polyether polyol and hexamethylene diisocyanate-based polyisocyanate in a mass ratio of (18-22): (78-82), wherein component B comprises the following raw materials in mass parts: 14-16 parts of epoxy resin, 22-24 parts of polyaspartic ammonia resin, 6 ~8 parts of diglycerol sesquioctanoate, 0.25~0.32 parts of silane coupling agent, 0.03~0.05 parts of ethylene glycol monobutyl ether acetate, 0.03~0.05 parts of polysiloxane compound, 0.03~0.04 parts of organic polymer modified dimethyl siloxane, 0.04~0.05 parts of triethylene glycol diisooctanoate, 10~11 parts of pigment, 35~41 parts of filler, 2~3 parts of silicon dioxide, 0.05~0.1 parts of ultraviolet absorber, and 3~3.5 parts of color paste.

[0006] In the above technical scheme, the present application optimizes component A and component B of the epoxy-modified polyurethane floor coating, generates a polyurethane prepolymer by the reaction of the polyether polyol in component A with hexamethylene diisocyanate-based polyisocyanate, selects hexamethylene diisocyanate-based polyisocyanate with good reactivity and room temperature curing ability, so that the generated polyurethane prepolymer gives the coating excellent gloss and fullness. At the same time, the hexamethylene diisocyanate-based polyisocyanate has good weather resistance, which meets the requirements of long-term outdoor exposure, and achieves a perfect combination of chemical stability and physical properties of the coating. By selecting epoxy resin and polyaspartic acid resin as the main ingredients in component B, the polyaspartic acid resin has low viscosity, low temperature resistance and good adhesion, provides good adhesion and chemical stability, and gives the epoxy-modified polyurethane floor coating better fullness and gloss. By adding dipolyglycerol sesquioctanoate , triethylene glycol diisooctanoate and ethylene glycol monobutyl ether acetate can reduce the viscosity of epoxy modified polyurethane floor coatings while maintaining the excellent mechanical properties of the cured product, effectively increase the active points of the cross-linking reaction, which is beneficial to the density of the cross-linking network, giving the epoxy modified polyurethane floor coatings better ductility and adhesion, and enhancing the bonding between the epoxy modified polyurethane floor coatings and the substrate. The addition of silica improves the stability of the epoxy modified polyurethane floor coatings and prevents stratification. The introduction of silane coupling agents, polysiloxane compounds and organic polymer modified dimethylsiloxanes further improves the flexibility and chemical resistance of the coating, and further extends the service life of the floor coating. The addition of ultraviolet absorbers gives the epoxy modified polyurethane floor coatings better light stability and delays the yellowing of the coating. The introduction of pigments and fillers gives the coating better smoothness and wear resistance.

[0007] Preferably, the component A is prepared from polyether polyol and hexamethylene diisocyanate-based polyisocyanate in a mass ratio of 20:80.

[0008] In the above technical solution, the present application controls the reaction ratio of polyether polyol and hexamethylene diisocyanate-based polyisocyanate in component A to 20:80. Such a ratio can ensure the formation of polyurethane prepolymer while ensuring the flexibility and chemical resistance of the coating.

[0009] Preferably, the B component includes the following raw materials in parts by mass: 15.1 parts of epoxy resin, 23.3 parts of polyaspartic acid resin, 7.3 parts of diglycerol sesquioctanoate, 0.28 parts of silane coupling agent, 0.04 parts of ethylene glycol monobutyl ether acetate, 0.04 parts of polysiloxane compound, 0.035 parts of organic polymer modified dimethyl siloxane, 0.045 parts of triethylene glycol diisooctanoate, 10.55 parts of pigment, 37.82 parts of filler, 2.2 parts of silicon dioxide, 0.08 parts of ultraviolet absorber, and 3.21 parts of color paste.

[0010] Preferably, the filler is composed of wet-process sericite powder, precipitated barium sulfate and white corundum powder.

[0011] Preferably, the B component includes 10 to 11 parts of wet-process sericite powder, 11 to 14 parts of precipitated barium sulfate, and 14 to 16 parts of white corundum powder.

[0012] In the above technical scheme, by selecting wet-process sericite powder, precipitated barium sulfate and white corundum powder to form fillers, the wet-process sericite powder has good dispersibility and stability, which can not only further improve the smoothness of the coating, but also reduce the penetration of ultraviolet rays to improve the friction of the coating and improve the cracking phenomenon. The precipitated barium sulfate provides good hiding power and weather resistance, while the white corundum powder has a narrow particle size distribution range, good particle morphology, high grinding efficiency, and good polishing effect, which can further improve the wear resistance and smoothness of the coating. Through the reasonable combination of these three fillers, the coating of the present invention significantly improves the physical properties of the coating while maintaining good construction performance.

[0013] Preferably, the mass ratio of component A to component B is 4:1.

[0014] In the above technical scheme, the present application controls the ratio of component A and component B, and controls the mass ratio of component A and component B to 4:1, so as to ensure that the coating has good mechanical properties and chemical resistance after curing, while maintaining good construction operability.

[0015] In the second aspect, the present application provides a method for preparing a wear-resistant epoxy-modified polyurethane floor coating using the following technical solution: A method for preparing a wear-resistant epoxy-modified polyurethane floor coating, wherein the method for preparing component A comprises the following steps: Step 1: Add polyether polyol into the reactor and stir at a speed of 500-800 r / min, and start heating at the same time, raise the temperature to 110-120°C, and start the vacuum pump, control the vacuum degree between -0.095MPa and -0.01MPa, and vacuum dehydration for 2-2.5h; Step 2: Cool the material obtained in step 1 to 80-82°C, then slowly add hexamethylene diisocyanate-based polyisocyanate in portions. After the addition, keep the temperature at 80-85°C for 2-2.2 hours. After the reaction is completed, cool to 55-60°C to obtain component A.

[0016] Preferably, the preparation method of the B component comprises the following steps: Step s1: adding epoxy resin, polyaspartic acid resin, diglycerol sesquioctanoate, silane coupling agent, polysiloxane compound, organic polymer modified dimethylsiloxane, triethylene glycol diisooctanoate, ethylene glycol monobutyl ether acetate to a reaction kettle in sequence, and stirring at a speed of 800 to 1000 r / min for 15 to 20 minutes; Step s2: adjust the stirring speed to 1000-1500 r / min, then add the remaining materials in sequence, and homogenize for 60-65 minutes to obtain component B.

[0017] In the above technical scheme, the present application ensures the uniform mixing of the coating components and the full reaction through specific process steps, thereby preparing an epoxy-modified polyurethane floor coating with excellent performance and ensuring the uniformity and stability of the coating.

[0018] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application generates a polyurethane prepolymer by reacting hexamethylene diisocyanate-based polyisocyanate and polyether polyol. This isocyanate has good reactivity and weather resistance, which not only gives the coating good gloss and fullness, but also enables the coating to meet the requirements of long-term outdoor exposure.

[0019] 2. This application selects polyaspartic acid resin as the main material of component B. Polyaspartic acid resin has the characteristics of low viscosity, low temperature resistance and good adhesion. It can provide good adhesion and chemical stability, and give the epoxy modified polyurethane floor coating better fullness and gloss.

[0020] 3. In the present application, diglycerol sesquioctanoate, triethylene glycol diisooctanoate and ethylene glycol monobutyl ether acetate are added as auxiliary agents of component B. The combination of the three can reduce the viscosity of the slurry as much as possible while maintaining good mechanical properties of the cured product. It can not only give the coating good smoothness, but also further improve the ductility and adhesion of the coating, and enhance the bonding strength between the coating and the substrate. DETAILED DESCRIPTION

[0021] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0022] The sources of some raw materials in the following specific implementation methods are shown in Table 1.

[0023] Table 1: Example 1 A wear-resistant epoxy-modified polyurethane floor coating comprises an A component and a B component.

[0024] Among them, the mass ratio of component A to component B is 4:1.

[0025] Wherein, component A is prepared by reacting polyether polyol and hexamethylene diisocyanate-based polyisocyanate.

[0026] Among them, component B includes epoxy resin, polyaspartic acid resin, diglycerol sesquioctanoate, silane coupling agent, ethylene glycol monobutyl ether acetate, polysiloxane compound, organic polymer modified dimethyl siloxane, triethylene glycol diisooctanoate, pigment, filler, silica, ultraviolet absorber, and color paste.

[0027] Among them, the pigment is titanium dioxide.

[0028] The filler is composed of wet-process sericite powder, precipitated barium sulfate and white corundum powder.

[0029] The preparation method of the wear-resistant epoxy-modified polyurethane floor coating includes the preparation of component A and the preparation of component B.

[0030] The preparation method of component A comprises the following steps: Step 1: Add polyether polyol into the reactor and stir at a speed of 600r / min. At the same time, turn on the temperature to 115°C, turn on the vacuum pump, control the vacuum degree between -0.095MPa and -0.01MPa, and vacuum dehydrate for 2.2h.

[0031] Step 2: Cool the material obtained in step 1 to 82°C, then slowly add hexamethylene diisocyanate-based polyisocyanate in portions. After the addition, keep the temperature at 85°C for 2 hours. After the reaction is completed, cool to 58°C to obtain component A.

[0032] The preparation method of component B comprises the following steps: Step s1: add epoxy resin, polyaspartic acid resin, diglycerol sesquioctanoate, silane coupling agent, polysiloxane compound, organic polymer modified dimethylsiloxane, triethylene glycol diisooctanoate, ethylene glycol monobutyl ether acetate into the reaction kettle in sequence, and stir at a speed of 900 r / min for 18 minutes.

[0033] Step s2: adjust the stirring speed to 1200 r / min, then add the remaining materials in sequence and homogenize for 62 minutes to obtain component B.

[0034] Example 2 A wear-resistant epoxy-modified polyurethane floor coating, which is different from Example 1 in that it includes component A and component B.

[0035] Wherein, component A is prepared by reacting polyether polyol and hexamethylene diisocyanate-based polyisocyanate.

[0036] Among them, component B includes epoxy resin, polyaspartic acid resin, diglycerol sesquioctanoate, silane coupling agent, ethylene glycol monobutyl ether acetate, polysiloxane compound, organic polymer modified dimethyl siloxane, triethylene glycol diisooctanoate, pigment, filler, silica, ultraviolet absorber, and color paste.

[0037] The preparation method of the wear-resistant epoxy-modified polyurethane floor coating includes the preparation of component A and the preparation of component B.

[0038] The preparation method of component A comprises the following steps: Step 1: Add polyether polyol into the reactor and stir at 800r / min. At the same time, turn on the temperature to 110°C, turn on the vacuum pump, control the vacuum degree between -0.095MPa and -0.01MPa, and perform vacuum dehydration for 2h.

[0039] Step 2: Cool the material obtained in step 1 to 82°C, then slowly add hexamethylene diisocyanate-based polyisocyanate in portions. After the addition, keep the temperature at 85°C for 2 hours. After the reaction is completed, cool to 60°C to obtain component A.

[0040] The preparation method of component B comprises the following steps: Step s1: add epoxy resin, polyaspartic acid resin, diglycerol sesquioctanoate, silane coupling agent, polysiloxane compound, organic polymer modified dimethylsiloxane, triethylene glycol diisooctanoate, ethylene glycol monobutyl ether acetate into the reaction kettle in sequence, and stir at a speed of 1000 r / min for 15 minutes.

[0041] Step s2: adjust the stirring speed to 1500 r / min, then add the remaining materials in sequence and homogenize for 60 minutes to obtain component B.

[0042] Example 3 A wear-resistant epoxy-modified polyurethane floor coating, which is different from Example 1 in that it includes component A and component B.

[0043] Wherein, component A is prepared by reacting polyether polyol and hexamethylene diisocyanate-based polyisocyanate.

[0044] Among them, component B includes epoxy resin, polyaspartic acid resin, diglycerol sesquioctanoate, silane coupling agent, ethylene glycol monobutyl ether acetate, polysiloxane compound, organic polymer modified dimethyl siloxane, triethylene glycol diisooctanoate, pigment, filler, silica, ultraviolet absorber, and color paste.

[0045] The preparation method of the wear-resistant epoxy-modified polyurethane floor coating includes the preparation of component A and the preparation of component B.

[0046] The preparation method of component A comprises the following steps: Step 1: Add polyether polyol into the reactor and stir at a speed of 500r / min. At the same time, turn on the temperature to 120°C, turn on the vacuum pump, control the vacuum degree between -0.095MPa and -0.01MPa, and perform vacuum dehydration for 2.5h.

[0047] Step 2: Cool the material obtained in step 1 to 80°C, then slowly add hexamethylene diisocyanate-based polyisocyanate in portions. After the addition, keep the temperature at 82°C for 2.2 hours. After the reaction is completed, cool to 55°C to obtain component A.

[0048] The preparation method of component B comprises the following steps: Step s1: add epoxy resin, polyaspartic acid resin, diglycerol sesquioctanoate, silane coupling agent, polysiloxane compound, organic polymer modified dimethylsiloxane, triethylene glycol diisooctanoate, ethylene glycol monobutyl ether acetate into the reaction kettle in sequence, and stir at a speed of 800 r / min for 20 minutes.

[0049] Step s2: adjust the stirring speed to 1000 r / min, then add the remaining materials in sequence and homogenize for 65 minutes to obtain component B.

[0050] The amounts of raw materials used in Examples 1 to 3 (g) are shown in Table 2.

[0051] Table 2: Comparative Example 1 An epoxy-modified polyurethane floor coating, which is different from Example 1 in that an equal amount of hexamethylene diisocyanate-based polyisocyanate is replaced by hexamethylene diisocyanate HDI, and is purchased from Wanhua Chemical.

[0052] Comparative Example 2 An epoxy-modified polyurethane floor coating, which is different from Example 1 in that an equal amount of polyaspartic ammonia resin is replaced by epoxy resin GELR128.

[0053] Comparative Example 3 An epoxy-modified polyurethane floor coating, which is different from Example 1 in that diglycerol sesquioctanoate is replaced by an equal amount of carbon 12-14 alkyl glycidyl ether, model: XY748, purchased from Anhui Xinyuan Technology Co., Ltd.

[0054] Comparative Example 4 An epoxy-modified polyurethane floor coating, which is different from Example 1 in that triethylene glycol diisooctanoate is replaced with an equal amount of carbon 12-14 alkyl glycidyl ether, model: XY748, purchased from Anhui Xinyuan Technology Co., Ltd.

[0055] Comparative Example 5 An epoxy-modified polyurethane floor coating, which is different from Example 1 in that ethylene glycol monobutyl ether acetate is replaced by an equal amount of a polymerized phosphate solution, model: DISPERBYK-110, purchased from BYK Chemical Co., Ltd. of Germany.

[0056] Performance Testing The epoxy-modified polyurethane floor coatings of the above-mentioned embodiments and comparative examples were tested for the items shown in Table 3, and the test results are shown in Tables 4 and 5.

[0057] Table 3: Table 4: Table 5: It can be seen from the test results of Tables 4 and 5 that the epoxy modified polyurethane floor coatings of Examples 1 to 3 perform well in terms of performance indicators of adhesion, wear resistance and elongation at break, which indicates that the epoxy modified polyurethane floor coating formula of the embodiment of the present application can significantly improve the comprehensive performance of the coating, especially can significantly improve the adhesion, wear resistance and ductility of the epoxy modified polyurethane floor coating.

[0058] Specifically combining the analysis of Example 1 and Comparative Examples 1-2, it can be seen that the difference between Comparative Examples 1-2 and Example 1 is that hexamethylene diisocyanate-based polyisocyanate and polyaspartic acid resin are replaced respectively, and Example 1 has good salt water resistance. It can be seen that adding hexamethylene diisocyanate-based polyisocyanate and polyaspartic acid resin to epoxy-modified polyurethane floor coatings is of great significance for improving the weather resistance of epoxy-modified polyurethane floor coatings. Hexamethylene diisocyanate-based polyisocyanate and polyaspartic acid resin can well improve the weather resistance of epoxy-modified polyurethane floor coatings.

[0059] Specifically combining Example 1 and Comparative Examples 3 to 5, it can be seen that the difference between Comparative Examples 3 to 4 and Example 1 is that dipolyglycerol sesquioctanoate, triethylene glycol diisooctanoate and ethylene glycol monobutyl ether acetate are replaced respectively, and Example 1 has good adhesion and wear resistance. It can be seen that dipolyglycerol sesquioctanoate, triethylene glycol diisooctanoate and ethylene glycol monobutyl ether acetate have a synergistic effect, and the combination of the three can further improve the ductility and adhesion of the coating, and enhance the bonding strength between the coating and the substrate.

[0060] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A wear-resistant epoxy-modified polyurethane floor coating, characterized in that: The invention comprises a component A and a component B, wherein the component A is prepared from polyether polyol and hexamethylene diisocyanate-based polyisocyanate in a mass ratio of (18-22): (78-82). Among them, component B includes the following raw materials in parts by mass: 14 to 16 parts of epoxy resin, 22 to 24 parts of polyaspartic acid resin, 6 to 8 parts of diglycerol sesquioctanoate, 0.25 to 0.32 parts of silane coupling agent, 0.03 to 0.05 parts of ethylene glycol monobutyl ether acetate, 0.03 to 0.05 parts of polysiloxane compound, 0.03 to 0.04 parts of organic polymer modified dimethyl siloxane, 0.04 to 0.05 parts of triethylene glycol diisooctanoate, 10 to 11 parts of pigment, 35 to 41 parts of filler, 2 to 3 parts of silicon dioxide, 0.05 to 0.1 parts of ultraviolet absorber, and 3 to 3.5 parts of color paste.

2. The wear-resistant epoxy-modified polyurethane floor coating according to claim 1, characterized in that: The component A is prepared from polyether polyol and hexamethylene diisocyanate-based polyisocyanate in a mass ratio of 20:

80.

3. The wear-resistant epoxy-modified polyurethane floor coating according to claim 1, characterized in that: The B component includes the following raw materials in parts by mass: 15.1 parts of epoxy resin, 23.3 parts of polyaspartic acid resin, 7.3 parts of diglycerol sesquioctanoate, 0.28 parts of silane coupling agent, 0.04 parts of ethylene glycol monobutyl ether acetate, 0.04 parts of polysiloxane compound, 0.035 parts of organic polymer modified dimethyl siloxane, 0.045 parts of triethylene glycol diisooctanoate, 10.55 parts of pigment, 37.82 parts of filler, 2.2 parts of silicon dioxide, 0.08 parts of ultraviolet absorber, and 3.21 parts of color paste.

4. The wear-resistant epoxy-modified polyurethane floor coating according to claim 1, characterized in that: The filler is composed of wet-process sericite powder, precipitated barium sulfate and white corundum micropowder.

5. The wear-resistant epoxy-modified polyurethane floor coating according to claim 4, characterized in that: The B component includes 10-11 parts of wet-process sericite powder, 11-14 parts of precipitated barium sulfate, and 14-16 parts of white corundum powder.

6. The wear-resistant epoxy-modified polyurethane floor coating according to claim 1, characterized in that: The mass ratio of the component A to the component B is 4:

1.

7. A method for preparing a wear-resistant epoxy-modified polyurethane floor coating, characterized in that: The preparation method of the component A comprises the following steps: Step 1: Add polyether polyol into the reactor and stir at a speed of 500-800 r / min. At the same time, turn on the temperature to raise the temperature to 110-120°C, and turn on the vacuum pump to control the vacuum degree between -0.095MPa and -0.01MPa, and vacuum dehydration for 2-2.5h; Step 2: Cool the material obtained in step 1 to 80-82°C, then slowly add hexamethylene diisocyanate-based polyisocyanate in portions. After the addition, keep the temperature at 80-85°C for 2-2.2 hours. After the reaction is completed, cool to 55-60°C to obtain component A.

8. The method for preparing a wear-resistant epoxy-modified polyurethane floor coating according to claim 7, characterized in that: The preparation method of the B component comprises the following steps: Step s1: adding epoxy resin, polyaspartic acid resin, diglycerol sesquioctanoate, silane coupling agent, polysiloxane compound, organic polymer modified dimethylsiloxane, triethylene glycol diisooctanoate, ethylene glycol monobutyl ether acetate to a reaction kettle in sequence, and stirring at a speed of 800-1000 r / min for 15-20 min; Step s2: adjust the stirring speed to 1000-1500 r / min, then add the remaining materials in sequence, and homogenize for 60-65 minutes to obtain component B.

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