A stretchable solid slip coating and a method of making the same

Abstract

The present application belongs to the technical field of coating preparation, and provides a stretchable solid-state sliding coating and a preparation method thereof. The preparation method comprises the following steps: spreading lubricating powder on a substrate, performing first heating and first cooling to obtain a lubricating solid layer; and coating a liquid flexible material on the lubricating solid layer, performing second heating and second cooling to obtain the stretchable solid-state sliding coating. In the process of second heating, the lubricating solid layer is melted, the lubricating particles in the lubricating solid layer penetrate into the liquid flexible material layer, and are uniformly dispersed in the form of crystalline microspheres on the surface layer of the liquid flexible material to achieve the sliding effect. Meanwhile, the use of the liquid flexible material enables the coating to have good stretchability, and the coating can still guarantee excellent sliding effect when the stretchability is 0-500%. The preparation method of the present application has the advantages of simple operation, low cost, green environmental protection, and wide application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of coating preparation, and in particular to a stretchable solid-state slip coating and a preparation method thereof. Background Art

[0002] The sliding surface has waterproof, anti-icing and anti-stick properties, and has broad application scenarios in production and life, aerospace, biomedicine, flexible electronics and other aspects. The main ways to achieve the sliding surface are liquid grease lubrication and solid grease lubrication. Liquid grease lubrication mainly uses liquid grease (such as silicone oil) to apply to the surface of the base material to achieve the sliding effect. Liquid grease lubrication has strong adaptability and a wide range of applications, but it has problems such as volatility and detachment during use, resulting in sliding failure, and environmental pollution. Solid grease lubrication is to apply a solid lubricant (such as paraffin, polyurethane) to the base material in liquid form through spraying, spin coating and immersion processes, and achieve a sliding effect after it solidifies. However, the sliding surface prepared by this process has problems such as poor flexibility and low adaptability. Summary of the Invention

[0003] In view of this, the object of the present invention is to provide a stretchable solid-state slip coating and a preparation method thereof. The stretchable solid-state slip coating prepared by the present invention has both excellent slip effect and flexibility.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The present invention provides a method for preparing a stretchable solid-state slip coating, comprising the following steps:

[0006] Spreading lubricating powder on a substrate, performing a first heating and a first cooling to obtain a lubricating solid layer;

[0007] After coating the liquid flexible material on the lubricating solid layer, performing a second heating and a second cooling to obtain the stretchable solid slip coating;

[0008] Preferably, the lubricating powder is applied in an amount of 3 to 5 mg / cm 2 .

[0009] Preferably, the substrate is sandpaper, polyimide (PI) film or polyethylene terephthalate (PET) film.

[0010] Preferably, the first heating temperature is 80-100°C.

[0011] Preferably, the liquid flexible material includes liquid silicone.

[0012] Preferably, the liquid silicone comprises one or more of Ecoflex 00-10, Ecoflex 00-30 or Ecoflex 00-50 and polydimethylsiloxane.

[0013] Preferably, the coating thickness of the liquid flexible material is 600-800 μm.

[0014] Preferably, the second heating temperature is 80-100° C. and the time is 3.5-4.5 hours.

[0015] The present invention also provides a stretchable solid-state slip coating prepared by the preparation method described in the above technical solution.

[0016] The present invention provides a method for preparing a stretchable solid-state slip coating, comprising the following steps: spreading a lubricating powder on a substrate, performing a first heating and a first cooling to obtain a lubricating solid layer; coating the lubricating solid layer with a liquid flexible material, and then performing a second heating and a second cooling to obtain the stretchable solid-state slip coating; the lubricating powder comprises erucamide powder and / or paraffin powder.

[0017] During the second heating process, the lubricating solid layer melts, and the lubricating particles within penetrate into the liquid flexible material layer and evenly disperse across the surface of the liquid flexible material in the form of crystalline microspheres, achieving a slip effect. Furthermore, the use of the liquid flexible material imparts excellent tensile properties to the coating, maintaining excellent slip performance at stretch rates of 0-500%. The preparation method proposed in this invention is simple to operate, low-cost, and environmentally friendly, possessing broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A flow chart for preparing the stretchable solid-state slip coating provided by the present invention;

[0019] Figure 2 Optical microscope images of the surface (a, b) and cross-section (c) of the stretchable solid-state slip coating obtained in Example 1;

[0020] Figure 3 This is an optical microscope image of the surface of the stretchable solid-state slip coating obtained in Example 2;

[0021] Figure 4 This is an optical microscope image of the surface of the stretchable solid-state slip coating obtained in Example 3;

[0022] Figure 5 1 is a comparison diagram of the slip angles of the stretchable solid-state slip coatings obtained in Examples 1 to 3;

[0023] Figure 6 This is a diagram showing the droplet sliding effect of the stretchable solid-state slip coating obtained in Example 1;

[0024] Figure 7 Surface comparison of the stretchable solid-state slip coating obtained in Example 1 before and after stretching;

[0025] Figure 8 Graph showing the test results of the slip angle of the stretchable solid-state slip coating obtained in Example 1 under tension;

[0026] Figure 9 Graph showing the elongation at break test results of the stretchable solid-state slip coating obtained in Example 1;

[0027] Figure 10 This is an optical microscope image of the surface of the stretchable solid-state slip coating obtained in Example 4;

[0028] Figure 11 This is an optical microscope image of the surface of the stretchable solid-state slip coating obtained in Example 5;

[0029] Figure 12 This is a comparison diagram of the slip angles of the stretchable solid-state slip coatings obtained in Examples 4 and 5. DETAILED DESCRIPTION

[0030] Figure 1 The preparation flow chart of the stretchable solid-state slip coating provided by the present invention is as follows: Figure 1 The preparation method provided by the present invention is described.

[0031] The present invention provides a method for preparing a stretchable solid-state slip coating, comprising the following steps:

[0032] Spreading lubricating powder on a substrate, performing a first heating and a first cooling to obtain a lubricating solid layer;

[0033] After coating the liquid flexible material on the lubricating solid layer, performing a second heating and a second cooling to obtain the stretchable solid slip coating;

[0034] The lubricating powder includes erucamide powder and / or paraffin powder.

[0035] In the present invention, unless otherwise specified, the raw materials used in the present invention are preferably commercially available products.

[0036] The present invention spreads lubricating powder on a substrate, performs first heating and first cooling, and obtains a lubricating solid layer.

[0037] In the present invention, the lubricating powder comprises erucamide powder and / or paraffin powder, and is more preferably erucamide powder. In the present invention, the amount of the lubricating powder to be applied is preferably 3 to 5 mg / cm 2 , more preferably 3.2 to 3.8 mg / cm 2, more preferably 3.5 mg / cm 2 .

[0038] In the present invention, the substrate is preferably sandpaper, polyimide (PI) film or polyethylene terephthalate (PET) film, and more preferably sandpaper.

[0039] In the present invention, the first heating temperature is preferably 80-100°C, and the time is preferably 5 minutes. In the present invention, when the lubricating powder is paraffin, the first heating temperature is more preferably 80-90°C, and when the lubricating powder is erucamide, the first heating temperature is more preferably 90-100°C.

[0040] In the present invention, the first cooling method is preferably natural cooling.

[0041] After obtaining the lubricating solid layer, the present invention coats the liquid flexible material on the lubricating solid layer, and then performs a second heating and a second cooling to obtain the stretchable solid slip coating.

[0042] In the present invention, the liquid flexible material preferably comprises liquid silicone. In the present invention, the liquid silicone preferably comprises one or more of Ecoflex 00-10, Ecoflex 00-30, Ecoflex 00-50 and polydimethylsiloxane, and more preferably Ecoflex 00-30.

[0043] In the present invention, the coating thickness of the liquid flexible material is preferably 600-800 μm.

[0044] In the present invention, the second heating temperature is preferably 80-100° C., the second heating time is preferably 3.5-4.5 h, and more preferably 4 h.

[0045] During the second heating process, the lubricating solid layer melts and penetrates the surface of the liquid flexible material layer; at the same time, the liquid flexible material layer solidifies. For example, in the case of erucamide and Ecoflex 00-30, during the second heating process, the erucamide solid layer melts, and the erucamide molecules become active, penetrating the surface of the liquid silicone film. Closely spaced erucamide molecules aggregate to form micro-nano liquid spheres of a certain size (approximately 50 μm in diameter). During this process, the liquid silicone film completely solidifies.

[0046] In the present invention, the second cooling method is preferably natural cooling.

[0047] After the second cooling, the present invention preferably further comprises peeling the composite coating from the substrate. The present invention does not specifically limit the method of peeling.

[0048] The present invention also provides a stretchable solid-state slip coating prepared by the preparation method described in the above technical solution.

[0049] The stretchable solid-state slip coating and the preparation method thereof provided by the present invention are described in detail below with reference to the embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0050] Materials used: Erucamide (purchased from MacLean, chemically pure, C 22 H 43 NO), paraffin (purchased from McLean, section paraffin, pathological grade, melting point 52-54°C), Ecoflex 00-30 (Smooth On), PDMS (Dow Corning SYLGARD 184), and 3M plastic-based sandpaper (400 mesh).

[0051] Example

[0052] Examples 1 to 3

[0053] The lubricating powder and the amount of flattening used in Examples 1 to 3, the liquid flexible material and its coating thickness are shown in Table 1. In Examples 1 to 3, the first heating temperature is 90° C. and the time is 5 minutes, and the second heating temperature is 90° C. and the time is 4 hours.

[0054] Table 1 Preparation parameters of Examples 1 to 3

[0055] Lubricating powder <![CDATA[Flat usage (mg / cm 2 )]]> Liquid flexible material Coating thickness (μm) Example 1 Erucamide 3.5 Ecoflex00-30 800 Example 2 Erucamide 3.5 Ecoflex00-30 600 Example 3 Erucamide 5.0 Ecoflex00-30 800

[0056] It can be seen from Table 1 that compared with Example 1, the coating thickness of the liquid flexible material in Example 2 is 600 μm; compared with Example 1, the flattening amount of erucamide powder in Example 3 is 5.0 mg / cm 2 .

[0057] Figure 2 Optical microscope images of the surface (a, b) and cross section (c) of the stretchable solid slip coating obtained in Example 1; Figure 2 From a and b, we can see that the diameter of the cured erucamide microspheres is about 50 μm. Figure 2 It can be seen from c that the thickness of the obtained stretchable solid-state slip coating is about 800 μm, and erucamide microspheres are embedded in the surface layer of the obtained stretchable solid-state slip coating.

[0058] Figure 3 This is an optical microscope image of the surface of the stretchable solid-state slip coating obtained in Example 2. Figure 3 It can be seen that the diameter of the cured erucamide microspheres is about 50 μm.

[0059] Figure 4 This is an optical microscope image of the surface of the stretchable solid-state slip coating obtained in Example 3. Figure 4 It can be seen that the diameter of the cured erucamide microspheres is about 45 μm.

[0060] Figure 5 The comparison diagram of the slip angles of the stretchable solid-state slip coatings obtained in Examples 1 to 3 is shown in FIG. Figure 5 It can be seen that the slip angles of the stretchable solid-state slip coatings obtained in Examples 1 to 3 are 24.9°, 24.5° and 24.2°, respectively.

[0061] Figure 6 The droplet sliding effect diagram of the stretchable solid slip coating obtained in Example 1 is shown in FIG. Figure 6 It can be seen that at an inclination angle of 25°, the prepared stretchable slip film has a good slip effect.

[0062] Figure 7 The surface comparison of the stretchable solid-state slip coating obtained in Example 1 before and after stretching is shown in FIG. Figure 7 It can be seen that the surface structure of the stretchable solid-state slip coating obtained in Example 1 does not change significantly before and after stretching.

[0063] Figure 8 The graph of the test results of the tensile state slip angle of the stretchable solid-state slip coating obtained in Example 1 is shown in FIG. Figure 8 It can be seen that the stretchable solid-state slip coating obtained in Example 1 still has a good slip effect in the stretched state.

[0064] Figure 9 The elongation at break test result of the stretchable solid-state slip coating obtained in Example 1 is shown in FIG. Figure 9 It can be seen that the elongation at break of the stretchable solid-state slip coating obtained in Example 1 can reach 630%, reflecting excellent tensile properties.

[0065] Examples 4-5

[0066] The lubricating powder used in Examples 4-5 and its spreading amount, the liquid flexible material and its coating thickness are shown in Table 2. The first heating temperature is 90° C. and the time is 5 minutes; the second heating temperature is 90° C. and the time is 4 hours.

[0067] Table 2 Preparation parameters of Examples 4 to 5

[0068] Lubricating powder <![CDATA[Flat usage (mg / cm 2 )]]> Liquid flexible material Coating thickness (μm) Example 4 paraffin 3.5 Ecoflex00-30 800 Example 5 Erucamide 3.5 PDMS 800

[0069] Figure 10 The optical microscope image of the surface of the stretchable solid-state slip coating obtained in Example 4 is shown in FIG. Figure 10 It can be seen that the solidified paraffin wax forms a solid paraffin wax film on the surface of the stretchable solid slip coating.

[0070] Figure 11The optical microscope image of the surface of the stretchable solid-state slip coating obtained in Example 5 is shown in FIG. Figure 11 It can be seen that the diameter of the cured erucamide microspheres is about 20 μm.

[0071] Figure 12 The comparison diagram of the slip angles of the stretchable solid-state slip coatings obtained in Examples 4 and 5 is shown in FIG. Figure 12 It can be seen that the slip angles of the stretchable solid-state slip coatings obtained in Examples 4 and 5 are 26.6° and 27.5°, respectively.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a stretchable solid-state slip coating, characterized in that: The following steps are involved: Spreading lubricating powder on a substrate, performing a first heating and a first cooling to obtain a lubricating solid layer; After coating the liquid flexible material on the lubricating solid layer, performing a second heating and a second cooling, and after the second cooling, further comprising peeling the composite coating from the substrate to obtain the stretchable solid slip coating; The lubricating powder includes erucamide powder and / or paraffin powder; The first heating temperature is 80-100° C.; The liquid flexible material includes liquid silicone; The second heating temperature is 80-100° C. and the time is 3.5-4.5 hours; The substrate is sandpaper.

2. The preparation method according to claim 1, characterized in that The amount of lubricating powder used is 3-5 mg / cm 2 .

3. The preparation method according to claim 1, characterized in that The liquid silicone comprises one or more of Ecoflex 00-10, Ecoflex 00-30 or Ecoflex 00-50 and polydimethylsiloxane.

4. The preparation method according to claim 1 or 3, characterized in that The coating thickness of the liquid flexible material is 600-800 μm.

5. A stretchable solid-state slip coating obtained by the preparation method according to any one of claims 1 to 4.

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