Special tool for rapidly testing covering power of coating wet film

Abstract

The utility model relates to a special tool for rapidly testing the covering power of a coating wet film. The special tool comprises a scraper plate and a scraper, the scraping plate comprises a long-strip-shaped base material and transparent long-strip-shaped quartz glass. The upper surface of the long-strip-shaped base material is provided with a long-strip-shaped groove parallel to the long edge of the base material. The long-strip-shaped quartz glass corresponds to the long-strip-shaped groove and is embedded, sealed and pasted in the long-strip-shaped groove, the groove embedded with the long-strip-shaped quartz glass is designed to be an inclined groove, the depth of one end of the inclined groove meets the set maximum depth requirement, and the depth of the other end of the inclined groove is zero; black and white checkered patterns are printed on the back surface of the long-strip-shaped quartz glass; and one side or two sides of the chute are provided with scales corresponding to the depths of the corresponding positions of the chute. The special tool is used for testing the covering power of the coating wet film, the detection result is more parallel, and the stability is higher. Meanwhile, the detection time can be greatly shortened, and the production detection efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a device for testing the hiding power of a wet film of a coating, in particular to a special tool for quickly testing the hiding power of a wet film of a coating. Background Art

[0002] Paint hiding power is a crucial performance indicator. It indicates the minimum amount of paint required to evenly distribute the paint on a surface without revealing the underlying color. In other words, it represents the ability of the coating to conceal the underlying color of the surface being painted. Excellent hiding power is essential for a high-quality coating, and this is particularly crucial when applied in thin layers. Currently, the most commonly used method for testing wet-film hiding power is to use the standard GB / T 23981.2-2023, Determination of Hiding Power of Paints and Varnishes - Part 2: Black-and-White Checkered Panel Method. This method involves manual application of the paint onto a glass panel with alternating black and white checkered panels. Visual inspection is performed, and the end point of the test is used to calculate the hiding power. Manual application inevitably results in uneven film thickness, which can affect test results and necessitate multiple, time-consuming tests, impacting production efficiency. Therefore, a rapid and accurate method for testing wet-film hiding power is needed. Utility Model Content

[0003] The purpose of this utility model is to solve the aforementioned problems and provide a special tool for quickly testing the hiding power of wet film coatings. This tool can quickly test the hiding power of wet film coatings and ensure that the test results can be stably reproduced, with more parallel and more stable test results. At the same time, it can also greatly shorten the test time and greatly improve production testing efficiency.

[0004] In order to solve the above problems, the present invention is implemented through the following technical solutions:

[0005] The utility model discloses a special tool for quickly testing the hiding power of a wet film of a coating, which comprises: a scraper and a scraper;

[0006] The scraper comprises a long strip substrate and a transparent long strip of quartz glass;

[0007] The upper surface of the elongated substrate is provided with an elongated groove parallel to the long side of the substrate;

[0008] The elongated quartz glass corresponds to the elongated groove and is inlaid and sealed in the elongated groove. The groove after the elongated quartz glass is inlaid is designed as an inclined groove. The depth of one end of the inclined groove meets the set maximum depth requirement (such as 30μm, 60μm...240μm), and the depth of the other end is zero.

[0009] Epoxy adhesive is preferably used for the inlay and sealing of long strips of quartz glass to prevent the paint from penetrating during testing.

[0010] The back of the long strip of quartz glass is printed with a black and white checkered pattern;

[0011] A scale is provided on one side or both sides of the chute, corresponding to the depth of the chute at the corresponding position.

[0012] The chute is formed by inlaying and sealing a long strip of quartz glass with a long strip of quartz glass. The chute can be formed by combining an inclined long strip of quartz glass with a flat long strip of quartz glass, or a flat long strip of quartz glass with an inclined long strip of quartz glass. The combination of an inclined long strip of quartz glass with a flat long strip of quartz glass is preferred.

[0013] The special tool for quickly testing the hiding power of wet film of coatings of the utility model is further optimized as follows:

[0014] The number of the inclined slots is at least one, preferably one or two.

[0015] The long strip substrate is made of non-magnetic stainless steel; preferably, the non-magnetic stainless steel has a hardness of not less than 56HRC;

[0016] The scraper is a single-edged or double-edged non-magnetic stainless steel scraper.

[0017] The special tool for quickly testing the hiding power of wet film of coatings of the utility model is further optimized as follows:

[0018] The scraper blade is straight and round, and has an arc shape with a radius of 0.25±0.05mm.

[0019] The scraper is designed with reference to the scraper in the "JB / T 9385-2017" standard, and is preferably made of non-magnetic stainless steel with a hardness of not less than 56HRC.

[0020] If the blade is deformed or worn during use, a new scraper should be replaced.

[0021] The special tool for quickly testing the hiding power of wet film of coatings of the utility model is further optimized as follows:

[0022] The scraper includes five specifications, namely, the depth gradient variation length range of the inclined groove is: 0-30μm, 0-60μm, 0-120μm, 0-180μm, and 0-240μm.

[0023] The special tool for quickly testing the hiding power of wet film of coatings of the utility model is further optimized as follows:

[0024] The dimensions of the long strip groove are: 150 mm long × 15 mm wide;

[0025] The size of each black and white square on the back of the long strip of quartz glass is 5 mm×5 mm.

[0026] The special tool for quickly testing the hiding power of wet film of coatings of the utility model is further optimized as follows:

[0027] The strip-shaped substrate of the scraper has a flat upper surface with a flatness error of no more than 3 μm, a lateral straightness error of no more than 1 μm, and a parallelism error of no more than 25 μm between the upper surface of the strip-shaped substrate and the lower surface.

[0028] The special tool for quickly testing the hiding power of wet film of coatings of the utility model is further optimized as follows:

[0029] The upper surface of the long strip substrate of the scraper and the surface roughness Ra of the long strip quartz glass are not greater than 0.2 μm.

[0030] The special tool for quickly testing the hiding power of wet film of coatings of the utility model is further optimized as follows:

[0031] The deviation between the groove depth at any position of the inclined groove and the standard value on the corresponding scale at that position does not exceed 1 μm.

[0032] This utility model is a specialized tool for rapidly testing the wet film hiding power of paint. It provides more consistent and stable test results. Furthermore, the test can be completed in under one minute, significantly improving production testing efficiency. Traditional methods require manual brushing, which is time-consuming and labor-intensive, and is significantly affected by human factors. Test results are prone to fluctuations, making accurate results difficult to obtain. Therefore, this utility model not only accurately measures the wet film hiding power of a product, but also significantly shortens testing time and improves testing efficiency.

[0033] Compared with GB / T 23981.2-2023 Paints and varnishes - Determination of hiding power - Part 2: Black and white grid method, the method of the present invention has two obvious advantages:

[0034] 1. The test is fast and can determine the minimum coating thickness within 1 minute. However, using the method in GB / T23981.2-2023, it takes about 5 minutes to apply once under skilled operation. Multiple tests will take more time and affect the detection efficiency.

[0035] 2. The results are highly reproducible. The use of detection tools in the coating preparation process completely avoids the uneven thickness of the coating caused by manual brushing. Even if different people operate, basically consistent test results can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1This is a front structural diagram of the scraper in the special tool for quickly testing the hiding power of wet coating films of the utility model (the left picture shows one inclined groove, and the right picture shows two inclined grooves);

[0037] Figure 2 This is a schematic cross-sectional structure diagram of a long side of a scraper in a special tool for quickly testing the hiding power of a wet film of a coating according to the present invention.

[0038] Description of the accompanying drawings:

[0039] 1-scraper, 2-long substrate, 3-long quartz glass, 4-long groove, 5-black and white checkered pattern, 6-ruler DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. Any simple improvements to the present invention based on the concepts of the present invention fall within the scope of protection of the present invention.

[0041] Example 1

[0042] A special tool for quickly testing the hiding power of a coating wet film, comprising: a scraper 1 and a scraper;

[0043] The scraper 1 includes a long strip substrate 2 and a transparent long strip quartz glass 3;

[0044] The upper surface of the long strip substrate 2 is provided with a long strip groove 4 parallel to the long side of the substrate;

[0045] The elongated quartz glass 3 corresponds to the elongated groove 4 and is embedded and sealed in the elongated groove 4. The groove after the elongated quartz glass 3 is embedded is designed as an inclined groove. The depth of one end of the inclined groove meets the set maximum depth requirement (such as 30 μm, 60 μm...240 μm), and the depth of the other end is zero.

[0046] The back of the long strip of quartz glass 3 is printed with a black and white checkered pattern 5;

[0047] A scale 6 is provided on one or both sides of the chute, corresponding to the depth of the chute at the corresponding position.

[0048] The number of the inclined slots is at least one.

[0049] The long strip substrate 2 is made of non-magnetic stainless steel;

[0050] The scraper is a single-edged non-magnetic stainless steel scraper.

[0051] The scraper blade is straight and round, and has an arc shape with a radius of 0.25 mm.

[0052] The scraper 1 has five specifications, i.e., the depth gradient of the inclined groove varies in the range of 0-30 μm, 0-60 μm, 0-120 μm, 0-180 μm, and 0-240 μm. Specific parameters of the inclined grooves of different specifications are shown in Table 1.

[0053] Table 1 (Unit: μm)

[0054]

[0055] The dimensions of the elongated groove 4 are: 150 mm long x 15 mm wide;

[0056] The size of each black and white square on the back of the long strip of quartz glass 3 is 5 mm×5 mm.

[0057] The strip-shaped substrate 2 of the scraper 1 has a flat upper surface with a flatness error of no more than 3 μm, a lateral straightness error of no more than 1 μm, and a parallelism error of no more than 25 μm between the upper surface and the lower surface of the strip-shaped substrate 2.

[0058] The surface roughness Ra of the upper surface of the long strip substrate 2 of the scraper 1 and the long strip quartz glass 3 is not greater than 0.2 μm.

[0059] The deviation between the groove depth at any position of the inclined groove and the standard value on the scale 6 corresponding to the position does not exceed 1 μm.

[0060] The method for testing the hiding power of a wet film of a coating using the special tool of the utility model comprises the following testing steps:

[0061] 1. Scraper selection: Under standard conditions, take sample 1 (Shishili high flash point alkyd paint white) and sample 2 (Shishili high flash point alkyd paint black) for testing.

[0062] Sample 1, hiding power requirement ≤ 200g / ㎡, standard density 1.32g / mL, estimated minimum film thickness approximately 150μm, select a scraper with a maximum groove depth of 180μm for testing;

[0063] Sample 2, hiding power requirement ≤45g / ㎡, standard density 1.22g / mL, estimated minimum film thickness about 40μm, select a scraper with a maximum groove depth of 60μm for testing.

[0064] 2. Minimum coating thickness test:

[0065] Place a clean and dry scraper on a horizontal, non-slip surface. Pour a sufficient amount of sample into the deep end of the groove. Holding the scraper with both hands, place the blade at the deep end of the groove, perpendicular to the scale surface, and keep the long side of the scraper parallel to the short side of the scraper. Scrape the scraper at a constant speed over the entire scraper surface within 1-2 seconds, until the groove depth reaches zero. Immediately place the scraper in a darkroom for observation. Read the minimum coating thickness at which no black or white grid is visible according to the scraper's accuracy requirements. Complete this operation within 10 seconds and perform three parallel measurements.

[0066] 3. Paint density test: Test the sample density according to GB-T 6750-2007 Paints and varnishes - Determination of density - Pycnometer method.

[0067] 4. Hiding power calculation:

[0068] The hiding power X (unit: g / ㎡) is calculated according to the following formula (based on wet paint film), and the result is accurate to the integer.

[0069] X=h×ρ

[0070] Where: h——minimum coating covering thickness, μm;

[0071] ρ——sample density, g / mL.

[0072] Comparative Example 1

[0073] The hiding power of Sample 1 and Sample 2 was measured using GB / T 23981.2-2023 Determination of hiding power of paints and varnishes - Part 2: Black and white grid method, and the measurement was repeated three times.

[0074] The test results are shown in Table 2:

[0075] Table 2 Test results

[0076]

[0077] Comparing the data in Table 2, we can see that using the special tool presented in this utility model to test the wet film hiding power of coatings yields more consistent and stable test results. Furthermore, the test can be completed within one minute, significantly improving production testing efficiency. Traditional methods, however, require manual brushing, which is time-consuming and labor-intensive, and is significantly affected by human factors. Test results are prone to fluctuations, making accurate results difficult to obtain. Therefore, the special tool presented in this utility model not only accurately measures the wet film hiding power of a product, but also significantly shortens testing time and improves testing efficiency.

[0078] In summary, the above are only preferred examples of the present invention and do not limit the present invention in any way. Any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the disclosed technical content shall be regarded as equivalent examples of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

[0079] The expressions of the positions involved in the technical solution of the present invention, such as up, down, upward and downward, etc., are only for clearly describing the corresponding structural connection methods, and are not intended to limit the specific actual positions of the technical solution. When the structures, connection methods and principles are the same or similar, they still fall within the scope of protection of the technical solution of the present invention.

[0080] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0082] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein can be applied to this technical solution.

Claims

1. A special tool for quickly testing the hiding power of wet film coatings, characterized by: It includes: scraper and scraper; The scraper comprises a long strip substrate and a transparent long strip of quartz glass; The upper surface of the elongated substrate is provided with an elongated groove parallel to the long side of the substrate; The long strip of quartz glass corresponds to the long strip of groove and is inlaid and sealed in the long strip of groove. The groove after the long strip of quartz glass is inlaid is designed as an inclined groove. The depth of one end of the inclined groove meets the set maximum depth requirement, and the depth of the other end is zero. The back of the long strip of quartz glass is printed with a black and white checkered pattern; A scale is provided on one side or both sides of the chute, corresponding to the depth of the chute at the corresponding position.

2. The special tool for quickly testing the hiding power of a coating wet film according to claim 1, characterized in that: The number of the inclined slots is at least 1 or 2.

3. The special tool for quickly testing the hiding power of a coating wet film according to claim 1, characterized in that: The long strip substrate is made of non-magnetic stainless steel; The scraper is a single-edged or double-edged non-magnetic stainless steel scraper.

4. The special tool for quickly testing the hiding power of a coating wet film according to claim 1, characterized in that: The scraper blade is straight and round, and has an arc shape with a radius of 0.25±0.05mm.

5. The special tool for quickly testing the hiding power of a coating wet film according to claim 1, characterized in that: The scraper includes five specifications, namely, the depth gradient variation length range of the inclined groove is: 0-30μm, 0-60μm, 0-120μm, 0-180μm, and 0-240μm.

6. The special tool for quickly testing the hiding power of a coating wet film according to claim 1, characterized in that: The dimensions of the long strip groove are: 150 mm long × 15 mm wide; The size of each black and white square on the back of the long strip of quartz glass is 5 mm×5 mm.

7. The special tool for quickly testing the hiding power of a coating wet film according to claim 1, characterized in that: The strip-shaped substrate of the scraper has a flat upper surface with a flatness error of no more than 3 μm, a lateral straightness error of no more than 1 μm, and a parallelism error of no more than 25 μm between the upper surface of the strip-shaped substrate and the lower surface.

8. The special tool for quickly testing the hiding power of a coating wet film according to claim 1, characterized in that: The upper surface of the long strip substrate of the scraper and the surface roughness Ra of the long strip quartz glass are not greater than 0.2 μm.

9. The special tool for quickly testing the hiding power of a coating wet film according to claim 1, characterized in that: The deviation between the groove depth at any position of the inclined groove and the standard value on the corresponding scale at that position does not exceed 1 μm.

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