Water-based soft paint and preparation method thereof

Abstract

The invention relates to the field of water-based paint, in particular to water-based soft paint and a preparation method thereof. The water-based soft paint is prepared from the following components in percentage by mass: 50 to 60 percent of water-based polyurethane dispersion, 1 to 5 percent of wetting flatting agent, 5 to 10 percent of coalescing agent, 0.1 to 2 percent of drier, 1 to 10 percent of matting filler, 0.1 to 1 percent of thickening agent and water, the preparation method comprises the following steps: mixing the wetting leveling agent with the waterborne polyurethane dispersion; adding the coalescing agent and the drier and mixing; adding the matting filler and mixing; adding water and mixing; and adding a thickening agent and mixing to obtain the water-based soft paint. The method has the advantages that the coating is soft, the sticky phenomenon is improved and the like.

Description

Technical Field

[0001] The present application relates to the field of water-based coatings, and more specifically, to a water-based soft-touch paint and a preparation method thereof. Background Art

[0002] As the coatings industry continues to develop, consumers have higher requirements for the performance and quality of coatings. Traditional coatings are often insufficient in terms of touch and durability, mainly manifested in two major problems: rough feel and easy stickiness. These problems not only affect the overall aesthetics of the coating, but also bring many inconveniences to users in actual applications.

[0003] Rough touch is an unavoidable defect of many traditional coatings. Its causes are complex and involve multiple links such as formula design, material selection and production process. This rough touch not only reduces the quality of the decorative effect, but also makes users feel uncomfortable when in contact with the coating, especially in the home environment, this discomfort is particularly obvious.

[0004] At the same time, the stickiness problem is also one of the common problems of traditional coatings. The surface of some coatings tends to become sticky during the drying process or for a period of time after drying, which not only affects the cleaning and maintenance of the coating, but may also further deteriorate the appearance of the coating due to the adhesion of dust, stains, etc. This stickiness phenomenon not only increases the difficulty of use for users, but also reduces the practicality and durability of the coating.

[0005] So there is a little improvement. Summary of the invention

[0006] In order to give the coating a soft feel and improve the stickiness, the present application provides a water-based soft-touch paint and a preparation method thereof.

[0007] In the first aspect, the present application provides a water-based soft-touch paint, which adopts the following technical solution: A water-based soft-touch paint comprises the following components by mass percentage: 50-60% water-based polyurethane dispersion, 1-5% wetting and leveling agent, 5-10% film-forming aid, 0.1-2% drying agent, 1-10% matting filler, 0.1-1% thickener, and water; the water-based polyurethane dispersion is NeoRez R4000, and the drying agent is CYCAT 4045.

[0008] By adopting the above technical solution and selecting a specific water-based polyurethane dispersion and a drying agent for compounding, under special coordination, the coating formed by the water-based soft-touch paint has a flexible feel, is non-sticky, and does not burn the base.

[0009] As the main film-forming substance of the coating, the specially selected waterborne polyurethane dispersion has excellent flexibility and adhesion. The hydrophilic groups in its molecular structure enable the polyurethane molecules to be stably dispersed in water to form a uniform emulsion and provide a good system. The main components of the drier include metal acid hydroxy salts and propylene glycol. The metal acid hydroxy salts can react with certain groups in the waterborne polyurethane system to promote the drying process of the coating, thereby accelerating the volatilization of water from the coating film, which is beneficial to speed up the curing speed of the coating film. As an auxiliary component of the drier, propylene glycol can increase the solubility and stability of the drier and ensure its uniform distribution in the coating system. In addition, propylene glycol may also have a positive effect on the wettability and leveling properties of the coating, which helps to improve the appearance quality of the coating film.

[0010] During the coating process, the compounded coating gradually solidifies as the water evaporates and the solvent evaporates. In this process, cross-linking reactions occur between the molecular chains and ionic groups of the waterborne polyurethane to form a network structure. This structure gives the coating good mechanical properties and chemical resistance. At the same time, the special system can ensure that the curing process is faster and more uniform, avoiding defects caused by uneven curing.

[0011] The bottom burning phenomenon is usually caused by excessively strong paint solvents or improper use of diluents. In a special compound system, the selection of suitable waterborne polyurethane dispersions and driers, and the good compatibility and synergy between the components can effectively avoid the bottom burning phenomenon. In a special system, the driers have low solubility and reactivity, and will not cause excessive dissolution or damage to the substrate, further reducing the risk of bottom burning.

[0012] The specially selected waterborne polyurethane dispersion itself has good flexibility, and the addition of the drying agent does not destroy this property. The present application can make the coating film still maintain a soft feel after drying through reasonable compounding ratio and process conditions.

[0013] Preferably, the water-based soft-touch paint comprises the following components in terms of mass percentage: 50-60% water-based polyurethane dispersion, 1-2% wetting and leveling agent, 6-8% film-forming aid, 0.5-1% drying agent, 3-5% matting filler, 0.5-1% thickener, and water.

[0014] By adopting the above technical solution, the dosage relationship of each raw material in the system is further limited, so that the specific water-based polyurethane dispersion and drying agent can more fully exert their synergistic effect.

[0015] Preferably, the matting filler includes at least one of tourmaline, boron nitride, feldspar powder and silicon dioxide.

[0016] Preferably, the matting filler is tourmaline, boron nitride and feldspar powder, and the mass ratio of tourmaline, boron nitride and feldspar powder is (0.8-1.2):(0.8-1.2):(0.8-1.2).

[0017] By adopting the above technical solution, special tourmaline, boron nitride and feldspar powder are selected to provide good matte and extinction effects for water-based soft-touch paint. With the cooperation of the three, they can be more evenly dispersed in the system, and can also play a good role in physical filling, improve the fluidity of the paint and the smoothness of the coating, and further enhance the soft feel of the coating. The special water-based polyurethane dispersion and drying agent system can cooperate more fully with tourmaline, boron nitride and feldspar powder, so that tourmaline, boron nitride and feldspar powder are well suspended and evenly dispersed in the system, and play a better role.

[0018] Preferably, the matte filler is processed in the following manner: Step a: ultrasonically mixing the borate coupling agent, acid solution and ethanol solution; Step b: Add matting filler and stir magnetically for 1-2 hours; Step c: After suction filtration, washing and drying to constant weight, a modified matte filler is obtained.

[0019] Preferably, in the preparation of the modified matte filler, the mass ratio of the matte filler, the borate coupling agent, the acid solution, and the ethanol solution is 1: (0.01-0.03): (2-4): (90-95), based on the mass of the matte filler.

[0020] Tourmaline, boron nitride, and feldspar powder have specific crystal structures and surface properties. After specific treatment, they can produce a certain interfacial slip effect when interacting with water-based polyurethane resin, better reduce stress concentration, and prevent the coating from becoming brittle or cracking during long-term use, thereby maintaining its good flexible feel.

[0021] The surface energy of the specially treated matting filler is reduced, making the coating surface smoother and flatter, and less prone to adhesion. In addition, the interaction between the modified matting filler and the waterborne polyurethane dispersion is enhanced, and it also shows better compatibility with the system, which can effectively increase the cross-linking density of the coating. The formation of this cross-linking structure limits the movement of the molecular chain, making the coating more stable and less sticky after drying, and can maintain excellent performance for a long time.

[0022] Preferably, the film-forming aid includes at least one of ethylene glycol butyl ether (BCS) and dipropylene glycol butyl ether (DPNB).

[0023] Preferably, the film-forming aid is ethylene glycol butyl ether (BCS) or dipropylene glycol butyl ether (DPNB).

[0024] BCS has good solubility and volatility. It can be quickly distributed and volatilized in the coating system, taking away some solvent molecules with high surface tension. The hydroxyl and ether bonds in its molecular structure help to interact with other components in the coating. Dipropylene glycol butyl ether (DPNB) has a unique structure of two hydrophilic groups and two hydrophobic groups. The hydrophilic groups form hydrogen bonds with water molecules to increase wettability and colloidal dispersibility; the hydrophobic groups interact with organic components such as resins to improve the coating's coating and leveling properties. The complementarity of ethylene glycol butyl ether and dipropylene glycol butyl ether in molecular structure enables them to work together in the coating system to reduce surface tension from different angles.

[0025] When BCS and DPNB are present in the coating at the same time, they will work synergistically, making it easier for the solvent molecules on the coating surface to be volatilized away, reducing stickiness. At the same time, the low surface tension film formed by DPNB can exist stably, and together achieve a significant reduction in surface tension, so that the coating has better fluidity and leveling during construction, reduces the generation of bubbles and pinholes, improves the uniformity and smoothness of the coating, and enhances the softness.

[0026] In a second aspect, the present application provides a method for preparing a water-based soft-touch paint, using the following technical solution: A method for preparing a water-based soft-touch paint comprises the following steps: Step 1: Mix the wetting and leveling agent with the waterborne polyurethane dispersion at 300-500r / min for 3-5min; Step 2: Add film-forming aid and drying agent, and mix at 400-500r / min for 5-8min; Step 3: Add matting filler and mix for 10-15 minutes; Step 4: Add water and mix for 3-5 minutes; Step 5: Add thickener and mix at 500-600 r / min for 10-15 minutes to obtain water-based soft-touch paint.

[0027] By adopting the above technical solution, the order and mixing conditions of mixing the raw materials are further limited, so that the various raw materials can be fully mixed and thus play a synergistic role.

[0028] In summary, this application has the following beneficial effects: 1. Since the present application adopts a specific water-based polyurethane dispersion and a drying agent, under special matching, the coating formed by the water-based soft-touch paint has a flexible feel, is non-sticky, and does not burn the base.

[0029] 2. Special tourmaline, boron nitride and feldspar powder are selected to provide good matte and extinction effects for water-based soft-touch paint. With the cooperation of the three, they can be more evenly dispersed in the system, and can also play a good role in physical filling, improve the fluidity of the paint and the smoothness of the coating, and further enhance the soft feel of the coating.

[0030] 3. The interaction between the modified matting filler and the waterborne polyurethane dispersion is enhanced, and it also shows better compatibility with the system, which can effectively increase the cross-linking density of the coating. The formation of this cross-linking structure limits the movement of the molecular chain, making the coating more stable and less sticky after drying, and can maintain excellent performance for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the appearance diagram of the test sample of Example 1.

[0032] Figure 2 This is the appearance of the test sample of Example 1 after UV treatment (Test 3).

[0033] Figure 3 This is the appearance of the test sample of comparative example 1 after UV treatment (test three).

[0034] Figure 4 This is the appearance of the test sample of Comparative Example 2 after UV treatment (Test 3). DETAILED DESCRIPTION

[0035] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0036] The raw materials used in the following examples and comparative examples are all commercially available products. Example

[0037] Example 1 A water-based soft-touch paint comprises the following components: a water-based polyurethane dispersion, a wetting and leveling agent, a film-forming aid, a drying agent, a matting filler, a thickener and water.

[0038] The content of each component is shown in Table 1.

[0039] The waterborne polyurethane dispersion was NeoRez R4000, purchased from DSM of the Netherlands.

[0040] The wetting and leveling agent is polyether modified silicone, and the specific model is BYK306 leveling agent.

[0041] The film-forming aids are ethylene glycol butyl ether and dipropylene glycol butyl ether.

[0042] The drying agent was CYCAT 4045, purchased from Allnex, USA.

[0043] The matting fillers are tourmaline, boron nitride, and feldspar powder, which are processed in the following ways: Step a: prepare raw materials according to the mass ratio of matting filler, borate coupling agent LD-100P, acid solution (5 mol / L hydrochloric acid solution) and 75% ethanol solution of 1:0.02:3:95.

[0044] Step b: Ultrasonically mix the borate coupling agent, acid solution and ethanol solution until they are uniform.

[0045] Step c: Add matte filler and stir magnetically for 1.5 h.

[0046] Step d: Filter by suction, wash with deionized water until neutral, and dry with hot air at 60° C. until constant weight, to obtain a modified matte filler.

[0047] The thickener is a polyurethane thickener, specifically RHOELATE 299 purchased from Hemmings, USA.

[0048] The present application also provides a method for preparing a water-based soft-touch paint, comprising the following steps: Step 1: Mix the wetting and leveling agent with the waterborne polyurethane dispersion at 400 r / min for 4 minutes.

[0049] Step 2: Add film-forming aid and drying agent, and mix at 450r / min for 6 minutes.

[0050] Step 3: Maintaining 450r / min, add matting filler and mix for 12 minutes.

[0051] Step 4: Maintain 450r / min, add water and mix for 4 minutes.

[0052] Step 5: Add thickener and mix at 550 r / min for 12 minutes to obtain a water-based soft-touch paint.

[0053] Example 2 A water-based soft-touch paint, which is different from Example 1 in that the content of each component is different, see Table 1 for details.

[0054] Matting fillers are processed in the following ways: Step a: prepare raw materials according to the mass ratio of matting filler, borate coupling agent LD-100P, acid solution (5 mol / L hydrochloric acid solution) and 75% ethanol solution of 1:0.01:2:95.

[0055] Step b: Ultrasonically mix the borate coupling agent, acid solution and ethanol solution until they are uniform.

[0056] Step c: Add matte filler and stir magnetically for 1 hour.

[0057] Step d: Filter by suction, wash with deionized water until neutral, and dry with hot air at 60° C. until constant weight, to obtain a modified matte filler.

[0058] A method for preparing a water-based soft-touch paint, which is different from Example 1 in that it comprises the following steps: Step 1: Mix the wetting and leveling agent with the waterborne polyurethane dispersion at 300 r / min for 5 minutes.

[0059] Step 2: Add film-forming aid and drying agent, and mix at 400r / min for 8min.

[0060] Step 3: Maintaining 400r / min, add matting filler and mix for 15 minutes.

[0061] Step 4: Maintain 400r / min, add water and mix for 5 minutes.

[0062] Step 5: Add thickener and mix at 500 r / min for 15 minutes to obtain water-based soft-touch paint.

[0063] Example 3 A water-based soft-touch paint, which is different from Example 1 in that the content of each component is different, see Table 1 for details.

[0064] Matting fillers are processed in the following ways: Step a: prepare raw materials according to the mass ratio of 1:0.03:4:90 of matting filler, borate coupling agent LD-100P, acid solution (5 mol / L hydrochloric acid solution) and 75% ethanol solution.

[0065] Step b: Ultrasonically mix the borate coupling agent, acid solution and ethanol solution until they are uniform.

[0066] Step c: Add matte filler and stir magnetically for 2 h.

[0067] Step d: Filter by suction, wash with deionized water until neutral, and dry with hot air at 60° C. until constant weight, to obtain a modified matte filler.

[0068] A method for preparing a water-based soft-touch paint, which is different from Example 1 in that it comprises the following steps: Step 1: Mix the wetting and leveling agent with the waterborne polyurethane dispersion at 500 r / min for 3 minutes.

[0069] Step 2: Add film-forming aid and drying agent, and mix at 500r / min for 5 minutes.

[0070] Step 3: Maintain 500r / min, add matting filler and mix for 10 minutes.

[0071] Step 4: Maintain 500r / min, add water and mix for 3 minutes.

[0072] Step 5: Add thickener and mix at 600 r / min for 10 min to obtain water-based soft-touch paint.

[0073] Example 4 A water-based soft-touch paint, which is different from Example 1 in that the content of each component is different, see Table 1 for details.

[0074] Table 1 Example 5 A water-based soft-touch paint, which is different from Example 1 in that the matting fillers are tourmaline, boron nitride, and feldspar powder, which are purchased from the market without being modified.

[0075] Example 6 A water-based soft-touch paint, which is different from Example 1 in that the matte filler is boron nitride, which is purchased from the market without being modified.

[0076] Example 7 A water-based soft-touch paint, which is different from Example 1 in that the matting filler is boron nitride. That is, after being purchased from the market, it is processed in the following manner: Step a: prepare raw materials according to the mass ratio of matting filler, borate coupling agent LD-100P, acid solution (5 mol / L hydrochloric acid solution) and 75% ethanol solution of 1:0.02:3:95.

[0077] Step b: Ultrasonically mix the borate coupling agent, acid solution and ethanol solution until they are uniform.

[0078] Step c: Add matte filler and stir magnetically for 1.5 h.

[0079] Step d: Filter by suction, wash with deionized water until neutral, and dry with hot air at 60° C. until constant weight, to obtain a modified matte filler.

[0080] Comparative Example Comparative Example 1 A water-based soft-touch paint, which is different from Example 1 in that the model of the drying agent is J2502, purchased from Green Union (Jining) Chemical Technology Co., Ltd.

[0081] Comparative Example 2 A water-based soft-touch paint, which is different from Example 1 in that the drying agent is cobalt isooctanoate. This comparative example was purchased from Hanpin Paint Industry (Shandong) Co., Ltd.

[0082] Performance testing Preparation of test samples: Stir the water-based soft-touch paint of Examples 1-7 and Comparative Examples 1-2 thoroughly before application. Place about 2 mL of the water-based soft-touch paint on one end of the degreased glass plate, spread it horizontally into a line, and use a paint film applicator to scrape at a fixed pressure and a speed of about 100 mm / s to form a smooth coating. Dry it at 23° C. and a relative humidity of 50% for 48 hours to obtain a test sample.

[0083] Test 1: Softness Touch the surface of the test sample with your hands and rate its softness from 0 to 10. The closer to 10, the better the softness, the closer to 0, the rougher the feel, and more than 6 points can be considered as qualified softness.

[0084] Eight experienced masters were selected for evaluation, and the average scores are recorded in Table 2.

[0085] Test 2: Stickiness Touch the surface of the test sample with your hands and rate its stickiness from 0 to 10. The closer to 10, the less sticky it is, the closer to 0, the more sticky it is, and more than 6 points can be considered as a qualified non-sticky effect.

[0086] Eight experienced masters were selected for evaluation, and the average scores are recorded in Table 2.

[0087] Test 3: UV aging resistance The test sample was placed in QUV for ultraviolet irradiation for 30 days, with the ultraviolet wavelength set to 320nm and the irradiation intensity set to 200W / m 2 , temperature is 40℃, and humidity is 75%.

[0088] After taking out the test sample after UV irradiation, test 1 and test 2 were performed again, and the obtained scores were recorded in Table 2.

[0089] The coating surface was visually inspected for cracks and other defects, and the results were recorded in Table 2.

[0090] Table 2 According to the test data in Table 2, the water-based soft-touch paint of Examples 1-7 showed good performance in both Test 1 and Test 2, with qualified softness and non-stickiness, which was significantly better than the water-based soft-touch paint of Comparative Examples 1-2. After being treated with ultraviolet light, the water-based soft-touch paint of Examples 1-7 can still show excellent softness and non-stickiness, and there is no cracking. In contrast, Comparative Examples 1-2 not only have poor performance in Tests 1 and 2, but also have a significant decline in performance after ultraviolet treatment. This shows that the specific water-based polyurethane dispersion and drying agent compound can indeed give the water-based soft-touch paint good performance.

[0091] Examples 5 and 7 are based on Example 1, but the matte filler is not modified; Example 6 is based on Example 1, but the special combination of matte fillers is destroyed. According to the test data in Table 2, although Examples 5-7 show qualified performance in Tests 1, 2, and 3, there is still a certain gap in performance compared with Examples 1-4. This shows that if a specific matte filler can be selected and modified, the water-based soft-touch paint can be given better performance in terms of softness, non-stickiness, weather resistance, etc.

[0092] Figure 1 This is the appearance diagram of the test sample of Example 1, Figure 2 This is the appearance of the test sample of Example 1 after UV treatment (Test 3). Figure 3 This is the appearance of the test sample of comparative example 1 after UV treatment (test three). Figure 4 This is the appearance of the test sample of Comparative Example 2 after UV treatment (Test 3).

[0093] 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 water-based soft-touch paint, It is characterized in that According to the mass percentage, it includes the following components: 50-60% waterborne polyurethane dispersion, 1-5% wetting and leveling agent, 5-10% film-forming aid, 0.1-2% drying agent, 1-10% matting filler, 0.1-1% thickener, and water; The waterborne polyurethane dispersion is NeoRez R4000 and the drying agent is CYCAT 4045.

2. The water-based soft-touch paint according to claim 1, Features: The water-based soft-touch paint includes the following components in percentage by mass: 50-60% water-based polyurethane dispersion, 1-2% wetting and leveling agent, 6-8% film-forming aid, 0.5-1% drying agent, 3-5% matting filler, 0.5-1% thickener, and water.

3. The water-based soft-touch paint according to claim 1, Features: The matting filler includes at least one of tourmaline, boron nitride, feldspar powder and silicon dioxide.

4. The water-based soft-touch paint according to claim 3, Features: The matting filler is tourmaline, boron nitride and feldspar powder, and the mass ratio of tourmaline, boron nitride and feldspar powder is (0.8-1.2): (0.8-1.2): (0.8-1.2).

5. The water-based soft-touch paint according to claim 4, Features: The matting filler is processed in the following manner: Step a: ultrasonically mixing the borate coupling agent, the acid solution and the ethanol solution; Step b: Add matting filler and stir magnetically for 1-2 hours; Step c: After suction filtration, washing and drying to constant weight, a modified matte filler is obtained.

6. The water-based soft-touch paint according to claim 5, Features: In the preparation of the modified matting filler, the mass ratio of the matting filler, the borate coupling agent, the acid solution and the ethanol solution is 1: (0.01-0.03): (2-4): (90-95), with the mass of the matting filler as the basis.

7. The water-based soft-touch paint according to claim 1, Features: The film-forming aid includes at least one of ethylene glycol butyl ether and dipropylene glycol butyl ether.

8. The water-based soft-touch paint according to claim 7, Features: The film-forming aids are ethylene glycol butyl ether and dipropylene glycol butyl ether.

9. A method for preparing a water-based soft-touch paint according to any one of claims 1 to 8, It is characterized in that The following steps are involved: Step 1: Mix the wetting and leveling agent with the waterborne polyurethane dispersion at 300-500r / min for 3-5min; Step 2: Add film-forming aid and drying agent, and mix at 400-500r / min for 5-8min; Step 3: Add matting filler and mix for 10-15 minutes; Step 4: Add water and mix for 3-5 minutes; Step 5: Add thickener and mix at 500-600 r / min for 10-15 minutes to obtain water-based soft-touch paint.

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