A coating wet film hiding power testing device

Abstract

This utility model discloses a coating wet film hiding power testing device, relating to the field of coating performance testing technology. It includes a black and white grid plate and a dedicated scraper. The black and white grid plate has a black and white grid groove area in the middle for coating application. A pair of guide rails are symmetrically arranged on the top surface of the black and white grid plate, with the black and white grid groove area located between the two guide rails. Guide grooves are provided on the inner side of the guide rails. The dedicated scraper slides along the guide rails through the guide grooves, and the bottom surface of the dedicated scraper is flush with the top surface of the black and white grid plate. This utility model can prepare wet film samples of various thicknesses at once, reducing human and light interference, and can achieve rapid determination of wet film hiding power when used with a reflectometer.

Description

Technical Field

[0001] This utility model relates to the field of coating performance testing technology, specifically a coating wet film hiding power testing device. Background Technology

[0002] During on-site coating application, color variations can occur in different areas due to factors such as substrate shape, flatness, application equipment, coating formulation, and external environment. This is especially true for coatings with low hiding power, which are more prone to color differences and showing through the base color. Therefore, hiding power is a crucial technical indicator in coating development. Better hiding power results in better color uniformity and a lower likelihood of base color showing through; conversely, poorer color uniformity increases the likelihood of base color showing through.

[0003] As an important indicator, the hiding power of a coating is directly related to the reflectivity and transmittance of the paint film. In terms of evaluating the hiding power of coatings, most companies currently use GB1726-79(89) (unit area weight method - black and white grid method) and GB / T5211.17-1988 "Comparison of contrast ratio (hiding power) of white pigments".

[0004] The specific test method for GB1726-79(89) (Unit Area Weight Method - Black and White Grid Method) is as follows: Apply paint evenly to the surface of a black and white grid board of a specific size. Then place the black and white grid board into a dark box and observe it under fluorescent light. The endpoint is reached when the black and white grids are just no longer visible; at this point, the background color is no longer visible and is completely covered by the paint. Record the amount of paint used at this point. The minimum amount of paint used per unit area (g / m²) is the standard test method. 2 This method describes the hiding power. The endpoint determination relies on human visual observation, which is easily affected by individual visual differences and lighting conditions, resulting in poor consistency. Most existing black and white grid boards are difficult to test in a wet film state, while the wet film state is closer to actual construction. However, due to its easy flow and damage, it cannot be stably prepared and tested; moreover, only a single thickness can be tested at a time, and the multiple coating and drying processes are time-consuming, and it is impossible to simultaneously compare the hiding performance at different thicknesses; it is also prone to light leakage and interference, affecting accuracy. Utility Model Content

[0005] This invention addresses the aforementioned problems in the existing technology by providing a coating wet film hiding power testing device that can prepare wet films of various thicknesses, has a stable structure, and is easy to test with a reflectivity meter, thereby achieving efficient evaluation of wet film hiding power.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] This utility model provides a coating wet film hiding power testing device, including a black and white grid plate and a special scraper. The black and white grid plate has a black and white grid groove area in the middle for coating. A pair of guide rails are symmetrically arranged on the top surface of the black and white grid plate. The black and white grid groove area is located between the two guide rails. A guide groove is provided on the inner side of the guide rails. The special scraper is slidably arranged with the guide rails through the guide groove. The bottom surface of the special scraper is flush with the top surface of the black and white grid plate.

[0008] Furthermore, the black and white grid groove area includes a first groove, a second groove, a third groove, and a fourth groove. The first groove, the second groove, the third groove, and the fourth groove have the same width but different depths. The groove surfaces of the first groove, the second groove, the third groove, and the fourth groove all have alternating black and white rectangular grids.

[0009] Furthermore, the special scraper is provided with four through holes, each corresponding to the first groove, the second groove, the third groove, and the fourth groove, respectively. The diameter of the through holes is smaller than the width of the black and white grid in each groove.

[0010] Furthermore, the special scraper is also provided with protrusions to facilitate the push and pull of the scraper by the experimenter.

[0011] Furthermore, waste bins are provided at both the front and rear ends of the black and white grid board.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows: 1. This utility model was specially designed and developed based on consideration of some characteristics of coatings (wet film wetting state, short duration, easy to be damaged, etc.) and the shape of reflectometer probe. The special scraper, together with the reflectometer, conveniently realizes the evaluation and comparison of the hiding power of coating wet film. It not only ensures that the stable state of coating wet film is not destroyed during the test, but also avoids the influence of light leakage on the test results, making it easy to successfully evaluate the hiding power of coating wet film.

[0013] 2. This invention can prepare multiple sets of wet coating films of different thicknesses at one time. When used with a reflectance measuring instrument, multiple sets of reflectance data can be measured simultaneously, reducing errors and facilitating comparison of the hiding power of coatings at different thicknesses. Attached Figure Description

[0014] Figure 1 This is a perspective view of a coating wet film hiding power testing device according to the present invention; Figure 2 This is a top view of a coating wet film hiding power testing device according to the present invention; Figure 3 for Figure 2 Sectional view along the middle AA direction; Reference numerals: 1-Black and white grid plate, 101-First groove, 102-Second groove, 103-Third groove, 104-Fourth groove, 2-Guide rail, 3-Special scraper, 301-Through hole, 302-Protrusion, 4-Waste box. Detailed Implementation

[0015] To more clearly illustrate the technical solution and effects of this utility model, the present utility model will be clearly and completely described below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely some embodiments of this utility model, not all embodiments, and the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0016] It should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] It should be noted that, unless otherwise explicitly specified and limited, the terms “installation,” “connection,” “linking,” and “setting” should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting; they can refer to direct connection or indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

[0018] Example 1 Please see Figure 1-3 As shown, this embodiment provides a coating wet film hiding power testing device, including a black and white grid plate 1 and a special scraper 3. The black and white grid plate 1 has a black and white grid groove area for coating in the middle. A pair of guide rails 2 are symmetrically arranged on the top surface of the black and white grid plate 1. The black and white grid groove area is located between the two guide rails 2. A guide groove is provided on the inner side of the guide rails 2. The special scraper 3 is slidably arranged with the guide rails 2 through the guide groove. The bottom surface of the special scraper 3 is flush with the top surface of the black and white grid plate 1.

[0019] Specifically, the black and white grid groove area includes a first groove 101, a second groove 102, a third groove 103, and a fourth groove 104. The first groove 101, the second groove 102, the third groove 103, and the fourth groove 104 have the same width but different depths. The groove surfaces of the first groove 101, the second groove 102, the third groove 103, and the fourth groove 104 all have alternating black and white rectangular grids. The special scraper 3 is provided with four through holes 301, each of which corresponds to the first groove 101, the second groove 102, the third groove 103, and the fourth groove 104. The diameter of the through hole 301 is smaller than the width of the black and white grids in each groove.

[0020] In this embodiment, the length of the black square in the black and white grid is 5cm and the width is 2.5cm; the length of the white square is 5cm and the width is 2.5cm; the width of the first groove 101 is 5cm and the depth (i.e., the distance between the bottom surface of the first groove 101 and the top surface of the black and white grid plate 1) is 50μm; the width of the second groove 102 is 5cm and the depth is 80μm; the width of the third groove 103 is 5cm and the depth is 120μm; the width of the fourth groove 104 is 5cm and the depth is 200μm; the length of the special scraper 3 is 25cm, the width is 2.5cm, the height is 0.5cm, and the diameter of the through hole 301 is 1.5cm; the guide groove on the inner side of the guide rail 2 is "<" shaped with an included angle of 90°, and the shape of the left and right ends of the special scraper 3 matches the guide groove.

[0021] Optionally, the special scraper 3 is also provided with a protrusion 302 to facilitate the push and pull of the scraper by the experimenter.

[0022] Optionally, waste boxes 4 are provided at both the front and rear ends of the black and white grid board 1 to collect excess paint scraped off the black and white grid groove area on the black and white grid board 1 by a special scraper 3.

[0023] In this invention, the special scraper 3 can slide out of the guide groove, so that the special scraper 3 and the black and white grid plate 1 can be separated, and the special scraper 3 and the black and white grid plate 1 can be placed or cleaned independently.

[0024] How to use the coating wet film hiding power testing device of this utility model: S1. Slide the special scraper 3 into one end of the guide groove, take an appropriate amount of the coating to be tested and add it to the black and white grid groove area. By pushing or pulling the special scraper 3, the coating is evenly applied to the black and white grid groove area, and a variety of wet films with different thicknesses of 50μm, 80μm, 120μm and 200μm are prepared at one time. S2. By observing the black and white grid pattern, determine the hiding power of the paint under different wet film conditions; S3. Move the special scraper 3 to the black and white square to be measured, and measure the reflectance of the black and white squares under the required wet film using a reflectance meter through the through hole 301 on the special scraper 3. S4. For each thickness of wet film, four sets of black square reflectance data and four sets of white square reflectance data can be measured at one time, and the average value of multiple sets of data is calculated. S5. The total area of ​​the black and white grid for each thickness of wet film is 100 cm². 2 Based on the coating density, the theoretical coverage ratio at the required wet film thickness is calculated to be 100 (cm). 2 x Wet film thickness (μm) x Coating density (g / cm³) 3 ) / 10 3 .

[0025] The above description is a preferred embodiment of the present utility model, used to explain the technical solution of the present utility model, and is not intended to limit the present utility model. Those skilled in the art can make conventional modifications, equivalent substitutions and improvements within the spirit and principles of the present utility model, all of which are still included within the protection scope of the present utility model.

Claims

1. A device for testing the hiding power of a coating wet film, characterized in that: The device includes a black and white grid board and a special scraper. The black and white grid board has a black and white grid groove area in the middle for coating. A pair of guide rails are symmetrically arranged on the top surface of the black and white grid board. The black and white grid groove area is located between the two guide rails. A guide groove is provided on the inner side of the guide rails. The special scraper is slidably arranged with the guide rails through the guide groove. The bottom surface of the special scraper is flush with the top surface of the black and white grid board.

2. The coating wet film hiding power testing device according to claim 1, characterized in that: The black and white grid groove area includes a first groove, a second groove, a third groove, and a fourth groove. The first groove, the second groove, the third groove, and the fourth groove have the same width but different depths. The groove surfaces of the first groove, the second groove, the third groove, and the fourth groove all have alternating black and white rectangular grids.

3. The coating wet film hiding power testing device according to claim 1, characterized in that: The special scraper is provided with four through holes, each corresponding to the first groove, the second groove, the third groove, and the fourth groove, respectively. The diameter of the through hole is smaller than the width of the black and white grid in each groove.

4. The coating wet film hiding power testing device according to claim 1, characterized in that: The special scraper is also provided with protrusions.

5. The coating wet film hiding power testing device according to claim 1, characterized in that: Waste boxes are provided at both the front and rear ends of the black and white checkered board.

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