An interface water quality detection device and method

Abstract

The present invention discloses an interface water quality detection device and method. The interface water quality detection device includes a test plate, a weight sensing unit, an interface water holding unit, a lifting unit, and a weight calculation unit. The test plate is used to be connected to the weight sensing unit, and the weight sensing unit weighs it. The interface water holding unit holds the interface water to be tested and is located below the weight sensing unit. The lifting unit is connected to the weight sensing unit and drives the weight sensing unit to drive the test plate to immerse in the interface water to be tested or separate from the interface water to be tested. The weight calculation unit is connected to the weight sensing unit, records the mass data output by the weight sensing unit, and calculates the paint solubility of the interface water. The present invention can be used as a means for interface water application units to evaluate the quality of interface water and a quality stability control method, ensure the paint film repair effect, and provide support for high-quality paint film quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of interface water quality detection, and particularly relates to an interface water quality detection device and method. Background Art

[0002] Interface water, also known as blending water, is an organic solvent mainly used to eliminate the traces of repair interfaces during paint film repair. After the product is painted, whether it is the paint film bump during transportation or the paint film defects caused during the painting process, the paint film needs to be polished and then repaired. During the repair process, interface traces will inevitably be formed at the position of the interface between the new and old paint films, and the splashed paint mist will fall on the positions around the repaired paint, resulting in a decrease in the gloss of the paint film. At this time, it is necessary to spray interface water to eliminate the repair interface traces and the gloss reduction caused by the fog paint and other phenomena.

[0003] In the Chinese patent application with the publication number CN 111234622 A, an interface water for repairing waterborne industrial coating topcoats and its application are disclosed. An interface water for repairing waterborne industrial coating topcoats is proposed, which mainly includes the composition and components of the interface water and the forming process, and can eliminate problems such as shrinkage holes, whitening, and loss of gloss during the repair process. The repaired paint surface is uniform, bright, and has no repair traces.

[0004] In the Chinese patent application with the publication number CN 1608744 A, a method for repairing local paint film damage on the metal surface is disclosed, including cleaning and polishing the damaged part; spraying a primer on the damaged part, and polishing the area within 4 - 5 times the area of the sprayed primer area; spraying color paint in the area within 2 - 3 times the area of the sprayed primer area with the damaged part as the center; spraying clear coat in the area within 100% - 120% of the area of the sprayed color paint area; spraying interface water at the edge of the sprayed clear coat area, and the interface water is prepared by uniformly mixing chemical thinning water and paint thinner in a ratio of 1:1 - 1:3, and finally performing a polishing treatment.

[0005] In the Chinese patent application with the publication number CN 110238008 A, a workpiece coating repair method is disclosed. The workpiece surface is provided with an original coating and a damaged area. The workpiece coating repair method includes: Step 1, polishing the damaged area and the extended area, where the extended area is divided into n areas; Step 2, spraying a repair paint of the same material as the original coating on the damaged area; Step 3, sequentially spraying a mixture of different repair paints and interface water in the n - 1 areas inside the extended area; Step 4, spraying interface water in the outermost area of the extended area. After the interface water dries, areas of a mixture of repair paint and interface water and areas of sprayed interface water with sequentially decreasing spraying ratios of repair paint between the repair paint and the original coating are formed, achieving multiple levels of color transition between the repair paint and the original coating, making the color transition smoother and more easily acceptable to the visual sense.

[0006] It can be seen that there is no method in the prior art for directly detecting the quality of the interface water itself. In addition, the current evaluation method for the quality of the interface water can only be based on the appearance of the paint film repair after trial use, including requirements such as shrinkage hole defects, gloss, and color difference. Although this evaluation method can judge whether the interface water is applicable within a certain range, the appearance of the paint film is affected by multiple factors such as the paint repair process, the quality of the interface water, and the quality of the paint, and it is impossible to correctly evaluate the quality of the interface water, which is not conducive to selecting a suitable interface water product when purchasing interface water. Therefore, there is an urgent need for a detection device and method that can evaluate the quality of the interface water. Summary of the Invention

[0007] In view of the above problems, the present invention proposes a device and method for detecting the quality of interface water, which can be used as a means for interface water application units to evaluate the quality of interface water and a control method for quality stability, ensuring the paint film repair effect and providing support for high-quality paint film quality.

[0008] In order to achieve the above technical objectives and achieve the above technical effects, the present invention is realized through the following technical solutions:

[0009] In a first aspect, the present invention provides a device for detecting the quality of interface water, including a test panel, a weight sensing unit, an interface water holding unit, a lifting unit, and a weight calculation unit;

[0010] The test panel is used to be connected to the weight sensing unit, and the weight sensing unit weighs it;

[0011] The interface water holding unit holds the interface water to be tested and is located below the weight sensing unit;

[0012] The lifting unit is connected to the weight sensing unit and drives the weight sensing unit to drive the test panel to immerse in the interface water to be tested or separate from the interface water to be tested;

[0013] The weight calculation unit is connected to the weight sensing unit, records the mass data output by the weight sensing unit, and calculates the paint dissolution power of the interface water.

[0014] Optionally, the lifting unit includes a time control module, a power module, and a lifting module;

[0015] The time control module is connected to the control end of the power module;

[0016] The power module is connected to the lifting module;

[0017] The control power module drives the lifting module to adjust the descending distance, the staying time after descending, the ascending distance, the staying time after ascending, and the number of reciprocating cycles of the test panel under the control of the time control module.

[0018] Optionally, the residence time after descending is set to 5 s to 50 s; the descending distance is set on the condition that the paint film of the test panel is completely immersed in the interface water in the interface water containing unit, and the ascending distance is set to be the same as the descending distance.

[0019] Optionally, the lifting module is a screw lifting rod, and the lifting is realized by forward rotation and reverse rotation.

[0020] Optionally, before the test panel undergoes the test, it is first suspended on the weight sensing unit, and the weight m0 is recorded by the weight calculation unit; after the test panel is removed from the weight sensing unit and coated with the paint, after the paint film reaches the surface dry state, it is suspended on the weight sensing unit again, and the weight m1 is recorded by the weight calculation unit; after the lifting unit drives the weight sensing unit to drive the test panel to be immersed in the interface water to be tested in a cycle, the weight of the test panel when the paint film reaches the surface dry state after immersion is weighed by the weight sensing unit, and the weight at this time is recorded as m2 by the weight calculation unit.

[0021] Optionally, the calculation formula for the paint solubility is:

[0022]

[0023] where R is the paint solubility.

[0024] In a second aspect, the present invention provides an interface water quality detection method, including:

[0025] Suspending an empty test panel on the weight sensing unit, and recording the weight m0 by the weight calculation unit;

[0026] Coating the empty test panel with the paint to be repaired for the interface water, and after the paint film on the test panel reaches the surface dry state, suspending the test panel on the weight sensing unit again, and recording the weight m1 by the weight calculation unit;

[0027] After the lifting unit drives the weight sensing unit to drive the test panel to be immersed in the interface water to be tested in a cycle, weighing the weight of the test panel when the paint film reaches the surface dry state after immersion by the weight sensing unit, and recording the weight at this time as m2 by the weight calculation unit;

[0028] Using the weight calculation unit to calculate the paint solubility of the interface water to be tested based on a preset formula.

[0029] Optionally, the calculation formula for the paint solubility is:

[0030]

[0031] where R is the paint solubility.

[0032] Optionally, the lifting unit includes a time control module, a power module, and a lifting module;

[0033] The time control module is connected to the control end of the power module;

[0034] The power module is connected to the lifting module;

[0035] Under the control of the time control module, the control power module drives the lifting module to adjust the descending distance, the staying time after descending, the ascending distance, the staying time after ascending, and the number of reciprocating cycles of the test plate.

[0036] Optionally, driving the weight sensing unit by the lifting unit to drive the test plate to be immersed in the interface water to be tested in a cycle includes the following steps:

[0037] (1) Start the power module, and adjust the descending distance of the test plate and the staying time after descending through the time control module. The descending distance is set on the condition that the entire paint film of the test plate can be immersed in the interface water;

[0038] (2) When the immersion time of the test plate reaches, adjust the ascending distance of the test plate and the staying time after ascending through the time control module. The ascending distance is set to be the same as the descending distance;

[0039] Repeat steps (1)-(2) until the preset soaking times and time requirements are met.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] The present invention provides an interface water quality detection device and method, which can directly calculate the paint dissolution power of the interface water, can be used as an evaluation means for the interface water quality of the interface water application unit, ensure the interface water quality, ensure the compatibility between the interface water and the repair paint, provide support for high-quality manufacturing, and provide support for the consistency of the appearance quality of the product paint film. Description of the Drawings

[0042] In order to make the content of the present invention be more clearly understood, the following further details the present invention according to specific embodiments in conjunction with the drawings, wherein:

[0043] Figure 1 is a schematic structural diagram of an interface water quality detection device according to an embodiment of the present invention;

[0044] Wherein:

[0045] 1. Time control module, 2. Weight calculation unit, 3. Power module, 4. Weight sensing unit, 5. Test plate, 6. Interface water holding unit, 7. Lifting module. Detailed Embodiment

[0046] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the protection scope of the present invention.

[0047] In the description of the present invention for a patent, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention for a patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention for a patent.

[0048] In the description of the present invention for a patent, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0049] The application principle of the present invention will be described in detail below with reference to the drawings.

[0050] Embodiment 1

[0051] In an embodiment of the present invention, an interface water quality detection device is provided. As Figure 1 shown, it includes a test plate 5, a weight sensing unit 4, an interface water containing unit 6, a lifting unit, and a weight calculation unit 2;

[0052] The test plate 5 is used to be connected to the weight sensing unit 4, and the weight sensing unit 4 weighs it;

[0053] The interface water containing unit 6 contains the interface water to be measured and is located below the weight sensing unit 4;

[0054] The lifting unit is connected to the weight sensing unit 4 and drives the weight sensing unit 4 to drive the test plate 5 to immerse in the interface water to be measured or separate from the interface water to be measured;

[0055] The weight calculation unit 2 is connected to the weight sensing unit 4, records the mass data output by the weight sensing unit 4, and calculates the paint solubility of the interface water.

[0056] It can be seen that based on the interface water quality detection device proposed in the embodiments of the present invention, the paint solubility of the interface water can be directly calculated, which can be used as an evaluation means for the quality of the interface water of the interface water application unit, ensure the quality of the interface water, ensure the compatibility between the interface water and the repair paint, provide support for high-quality manufacturing, and provide support for the consistency of the appearance quality of the product paint film.

[0057] In a specific implementation manner of the embodiments of the present invention, as Figure 1 shown, the lifting unit includes a time control module 1, a power module 3, and a lifting module 7;

[0058] The time control module 1 is connected to the control end of the power module 3;

[0059] The power module 3 is connected to the lifting module 7;

[0060] The control power module 3 drives the lifting module 7 to adjust the descending distance, the staying time after descending, the ascending distance, the staying time after ascending, and the number of reciprocating cycles of the test panel 5 under the control of the time control module 1.

[0061] In the specific implementation process, the staying time after descending can be set to 5 s to 50 s, and other values can also be set according to actual detection needs. There is no excessive limitation in the present invention as long as the detection effect can be ensured; the descending distance is set on the condition that the paint film of the test panel 5 is fully immersed in the interface water in the interface water containing unit 6, and the ascending distance is set to be the same as the descending distance; the staying time after ascending is adaptively set according to the agreed time.

[0062] In a specific implementation manner of the embodiments of the present invention, the lifting module 7 is a screw lifting rod, which realizes lifting through forward rotation and reverse rotation. The implementation principle is simple and the operation is convenient. The power module 3 can select an engine, and the output shaft of the engine is snap-connected to the screw lifting rod to drive the test panel 5 to lift.

[0063] In a specific implementation manner of the embodiments of the present invention, the test panel 5 is a test panel with appropriate size that can be painted, generally with a lifting hole for convenient picking and placing.

[0064] In a specific implementation manner of the embodiments of the present invention, the interface water containing unit 6 is a container that can store interface water, which can be a beaker or other containers that do not react with the interface water.

[0065] The following details the specific working process of the interface water quality detection device in the embodiments of the present invention.

[0066] Before the test board 5 undergoes the test, it is first suspended on the weight sensing unit 4, and the weight m0 is recorded by the weight calculation unit 2;

[0067] After the test board 5 is removed from the weight sensing unit 4, it is coated with paint. After the paint film reaches the surface-dry state, it is suspended on the weight sensing unit 4 again, and the weight m1 is recorded by the weight calculation unit 2;

[0068] The lifting unit is used to drive the weight sensing unit 4 to drive the test board 5 to be immersed in the interface water to be tested in a cycle. After immersion, the weight of the test board 5 when the paint film reaches the surface-dry state (surface dryness can be detected by the finger-touch method) is weighed by the weight sensing unit 4, and the weight at this time is recorded by the weight calculation unit 2 as m2. In a specific implementation manner of the embodiment of the present invention, the weight calculation unit 2 can be implemented by a computer. The calculation formula for the paint solubility is:

[0069]

[0070] where R is the paint solubility.

[0071] Among them, using the lifting unit to drive the weight sensing unit 4 to drive the test board 5 to be immersed in the interface water to be tested in a cycle includes the following steps:

[0072] (1) Start the power module 3, and adjust the descending distance and the staying time after descending of the test board 5 through the time control module 1. The descending distance is set on the condition that the entire paint film of the test board 5 can be immersed in the interface water;

[0073] (2) When the immersion time of the test board 5 reaches, adjust the ascending distance and the staying time after ascending of the test board 5 through the time control module 1. The ascending distance is set to be the same as the descending distance;

[0074] Repeat steps (1)-(2) until the preset immersion times and time requirements are met.

[0075] Next, the detection effect of the interface water quality detection device in the embodiment of the present invention will be described in combination with a specific implementation manner.

[0076] Step 1: Select tinplate as the test board 5, degrease, wash, and dry the tinplate, and record the weight as m0 after drying;

[0077] Step 2: Immerse the washed and dried tinplate in the paint stock solution (the prepared paint to be repaired) for 2 minutes, take it out and dry it to the surface-dry state, and record the weight as m1;

[0078] Step 3: Immerse the coated tinplate in the interface water for 10 s, then lift it up and keep it stationary for 30 s. This is one cycle. Repeat this cycle three times, and then let the film dry to the surface-dry state. Weigh it and record the weight as m2.

[0079] Step 4: Calculate the coating solubility R of the interface water according to the following formula:

[0080]

[0081] Step 5: Conduct more than three parallel tests and take the average value, which is the coating solubility of the interface water for this type of coating.

[0082] This detection method can distinguish the quality of interface water from different brands. The test results are shown in Table 1, and the following conclusions can be obtained:

[0083] Ranking of interface water quality: Brand 5 > Brand 1 > Brand 3 > Brand 2 > Brand 4

[0084] Table 1 Test results of coating solubility of interface water from different brands

[0085]

[0086]

[0087] Example 2

[0088] A method for detecting the quality of interface water is provided in an embodiment of the present invention, including the following steps:

[0089] Step 1: Hang the empty test plate 5 on the weight sensing unit 4, and record the weight m0 through the weight calculation unit 2; the empty test plate 5 refers to the test plate 5 that has been degreased, washed, and dried.

[0090] Step 2: Coat the empty test plate 5 with the coating to be repaired by the interface water. After the film on the test plate 5 reaches the surface-dry state, hang the test plate 5 on the weight sensing unit 4 again, and record the weight m1 through the weight calculation unit 2.

[0091] Step 3: Use the lifting unit to drive the weight sensing unit 4 to drive the test plate 5 to be immersed in the interface water to be tested in a cycle, and then weigh the test plate 5 when the film reaches the surface-dry state after immersion through the weight sensing unit 4. Record the weight at this time as m2 through the weight calculation unit 2.

[0092] Step 4: Use the weight calculation unit 2 to calculate the coating solubility of the interface water to be tested based on a preset formula.

[0093] The interface water quality detection method in the embodiments of the present invention can be set based on the interface water quality detection device. Based on the interface water quality detection method in the embodiments of the present invention, the paint solubility of the interface water can be directly calculated, which can be used as an evaluation means for the interface water quality of the interface water application unit, ensuring the interface water quality, ensuring the compatibility between the interface water and the repair paint, providing support for high-quality manufacturing, and providing support for the consistency of the appearance quality of the product paint film.

[0094] In a specific implementation manner of the embodiments of the present invention, the calculation formula for the paint solubility is:

[0095]

[0096] Wherein, R is the paint solubility.

[0097] In a specific implementation manner of the embodiments of the present invention, the lifting unit includes a time control module 1, a power module 3, and a lifting module 7;

[0098] The time control module 1 is connected to the control end of the power module 3;

[0099] The power module 3 is connected to the lifting module 7;

[0100] The control power module 3 drives the lifting module 7 to adjust the descending distance, the staying time after descending, the ascending distance, the staying time after ascending, and the number of cycles of the test panel 5 under the control of the time control module 1.

[0101] In the specific implementation process, the staying time after descending can be set to 5 s to 50 s, and can also be set to other values according to the actual detection needs. There is no excessive limitation in the present invention, as long as the detection effect can be ensured; the descending distance is set on the condition that the paint film of the test panel 5 is completely immersed in the interface water in the interface water containing unit 6, and the ascending distance is set to be the same as the descending distance; the staying time after ascending is adaptively set according to the agreed time.

[0102] In a specific implementation manner of the embodiments of the present invention, the lifting module 7 is a screw lifting rod, which realizes lifting through forward rotation and reverse rotation, with a simple implementation principle and convenient operation. The power module 3 can select an engine, and the output shaft of the engine is snap-connected to the screw lifting rod to drive the test panel 5 to lift.

[0103] In a specific implementation manner of the embodiments of the present invention, the test panel 5 is a test panel with a suitable size that can be painted, generally with a lifting hole for convenient picking and placing.

[0104] In a specific embodiment of the present invention, the interface water to be tested is placed in the interface water containing unit 6, and the interface water containing unit 6 is a container that can store the interface water, which can be a beaker or other containers that do not react with the interface water.

[0105] Driving the weight sensing unit 4 by the lifting unit to drive the test plate 5 to circulate and soak in the interface water to be tested includes the following steps:

[0106] (1) Start the power module 3, and adjust the descending distance and the staying time after descending of the test plate 5 through the time control module 1. The descending distance is set on the condition that the entire paint film of the test plate 5 can be soaked in the interface water.

[0107] (2) When the soaking time of the test plate 5 reaches, adjust the ascending distance and the staying time after ascending of the test plate 5 through the time control module 1. The ascending distance is set to be the same as the descending distance.

[0108] Repeat steps (1)-(2) until the preset soaking times and time requirements are met.

[0109] Next, the detection effect of the interface water quality detection method in the embodiments of the present invention will be described in combination with a specific embodiment.

[0110] Step 1: Select tinplate as the test plate 5, degrease, wash, and dry the tinplate, and record the weight as m0 after drying.

[0111] Step 2: Immerse the washed and dried tinplate in the paint stock solution (the prepared paint to be repaired) for 2 minutes, take it out and dry it until it is surface dry, and record the weight as m1.

[0112] Step 3: Immerse the tinplate coated with the coating in the interface water for 10 seconds, rise and stay for 30 seconds. This is one cycle. After repeating 3 times, let the paint film dry to surface dry and weigh it as m2.

[0113] Step 4: Calculate the paint dissolution power R of the interface water according to the following formula:

[0114]

[0115] Step 5: Conduct more than three parallel tests and take the average value, which is the paint dissolution power of the interface water for this kind of paint.

[0116] This detection method can distinguish the quality of interface water of different brands. The detection results are shown in Table 1, and the following conclusions can be obtained:

[0117] Interface water quality ranking: Brand 5 > Brand 1 > Brand 3 > Brand 2 > Brand 4.

[0118] Table 1 Test Results of Solubility of Interface Water Coatings of Different Brands

[0119]

[0120]

[0121] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An interface water quality detection device, characterized in that: it includes a test plate, a weight sensing unit, an interface water containing unit, a lifting unit and a weight calculation unit; the test plate is used to be connected to the weight sensing unit, and the weight sensing unit weighs it; the interface water containing unit contains the interface water to be tested, and is located below the weight sensing unit; the lifting unit is connected to the weight sensing unit, and drives the weight sensing unit to drive the test plate to immerse in the interface water to be tested or separate from the interface water to be tested; the weight calculation unit is connected to the weight sensing unit, records the mass data output by the weight sensing unit, and calculates the coating solubility of the interface water; the lifting unit includes a time control module, a power module and a lifting module; the time control module is connected to the control end of the power module; the power module is connected to the lifting module; the control power module drives the lifting module to adjust the descending distance, the staying time after descending, the ascending distance, the staying time after ascending, and the number of reciprocating cycles of the test plate under the control of the time control module; the staying time after descending is set to 5s to 50s; the descending distance is set on the condition that the paint film of the test plate is completely immersed in the interface water in the interface water containing unit, and the ascending distance is set to be the same as the descending distance; before the test plate undergoes the test, it is first suspended on the weight sensing unit, and the weight m0 is recorded by the weight calculation unit; after the test plate is removed from the weight sensing unit, it is coated with paint. After the paint film reaches the surface dry state, it is suspended on the weight sensing unit again, and the weight m1 is recorded by the weight calculation unit. After the weight sensing unit drives the test plate to cycle and immerse in the interface water to be tested by the lifting unit, the weight of the test plate when the paint film reaches the surface dry state after soaking is weighed by the weight sensing unit, and the weight at this time is recorded as m2 by the weight calculation unit.

2. An interface water quality detection device according to claim 1, characterized in that: the lifting module is a screw lifting rod, and the lifting is realized by forward rotation and reverse rotation.

3. An interface water quality detection device according to claim 1, characterized in that: the calculation formula for the coating solubility is: wherein, R is the coating solubility.

4. An interface water quality detection method, characterized in that, it includes: suspending an empty test plate on the weight sensing unit, and recording the weight m0 by the weight calculation unit; coating the empty test plate with the paint to be repaired for the interface water. After the paint film on the test plate reaches the surface dry state, suspend the test plate on the weight sensing unit again, and record the weight m1 by the weight calculation unit; after the weight sensing unit drives the test plate to cycle and immerse in the interface water to be tested by the lifting unit, the weight of the test plate when the paint film reaches the surface dry state after soaking is weighed by the weight sensing unit, and the weight at this time is recorded as m2 by the weight calculation unit; using the weight calculation unit to calculate the coating solubility of the interface water to be tested based on a preset formula; the lifting unit includes a time control module, a power module and a lifting module; The time control module is connected to the control end of the power module; The power module is connected to the lifting module; The control power module drives the lifting module to adjust the descending distance, the staying time after descending, the ascending distance, the staying time after ascending, and the number of reciprocating cycles of the test board under the control of the time control module; Driving the weight sensing unit by the lifting unit to drive the test board to be immersed in the water of the interface to be tested in a cycle, including the following steps: (1) Start the power module, and adjust the descending distance and the staying time after descending of the test board through the time control module. The descending distance is set on the condition that the entire paint film of the test board can be immersed in the interface water; (2) When the immersion time of the test board is up, adjust the ascending distance and the staying time after ascending of the test board through the time control module. The ascending distance is set to be the same as the descending distance; Repeat steps (1)-(2) until the preset immersion times and time requirements are met.

5. According to an interface water quality detection method as described in claim 4, characterized in that: The calculation formula for the paint solubility is: wherein, R is the paint solubility.

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