CN114112930A - Testing device and testing method for contrast ratio of paint wet film - Google Patents
Testing device and testing method for contrast ratio of paint wet film Download PDFInfo
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- CN114112930A CN114112930A CN202011009180.1A CN202011009180A CN114112930A CN 114112930 A CN114112930 A CN 114112930A CN 202011009180 A CN202011009180 A CN 202011009180A CN 114112930 A CN114112930 A CN 114112930A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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- G—PHYSICS
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
- G01B5/066—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness of coating
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/251—Colorimeters; Construction thereof
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Abstract
The invention relates to a testing device and a testing method for contrast ratio of a wet coating, which comprise a cuboid module a with a wedge-shaped groove and a template with two groups of observation round holes. The invention can not only measure the wet film contrast ratio of the coating with different film thicknesses, but also evaluate the wet covering power of the coating. The device and the method for testing the contrast ratio of the wet coating have the advantages of simplicity in operation, accurate numerical value, time saving, high efficiency and the like, and avoid the defects that the existing method for evaluating the wet covering power of the coating highly depends on visual judgment, and the visual judgment has certain limitations and subjectivity.
Description
Technical Field
The invention belongs to the field of performance test in the field of coatings, and particularly relates to a device and a method for testing the contrast ratio of a wet film of a coating.
Background
Wet hiding is widely noted in paint applications and construction because it is related to the amount of coating applied in actual construction, and thus wet hiding is the first impression of paint quality. Wet hiding refers to the ability to uniformly apply a colored opaque paint to the surface of an object to hide the background color of the surface of the object in a wet film.
There are many tests for hiding power, but most are used to characterize dry hiding of a paint film, while the wet hiding test method is less. A few test methods for wet hiding are also based on visual observations to determine the final result, and are therefore subject to subjective influences and environmental light sources. For example, national coating hiding power measurements GB 1726-79(89) are standards for coating hiding power that can be used to characterize wet film hiding power. The method is to measure the covering power of the paint by measuring the minimum amount of paint used when the paint is uniformly coated on the surface of an object and the bottom color is not presented any more, and when the difference between the two test results is more than 5 percent of the average value, the test needs to be carried out again. Therefore, the main disadvantages of this method are that it is time consuming and is not accurate enough to rely on the human eye for judgment.
In addition, a wedge-shaped wet film covering power instrument is available in the market for testing the coating weight of the coating when the wet film of the coating is completely covered, namely: hiding power. The instrument consists of a black and white bottom plate and a transparent glass plate. And scales of 0-50 are engraved along the edge of the half of the bottom plate occupied by the black and white. Two small protruding nails are arranged on one side of the transparent glass plate, the side of the transparent glass plate with the nails is placed in a black or white area of the bottom plate, and a wedge-shaped space supported by the small nails is formed between the panel and the glass plate. By moving the position of the transparent glass plate, the height of the glass plate to the black-and-white boundary is changed. Proper amount of paint is dripped on the black and white bottom plate, the transparent glass plate is covered, and the thickness of the coating film at the black and white boundary in the wedge-shaped space is changed along with the movement of the glass plate. The reading corresponding to the glass plate when the black and white limit just disappears or just appears is recorded, and the corresponding optimal coating weight can be found according to the reading. The judgment of the test result of the method needs to be carried out through a plurality of times of repeated tests, and the judgment of the black and white boundary still needs to be carried out by means of visual judgment, so that the method is greatly influenced by the visual sensitivity and the environment. The refraction and reflection of light can be easily influenced due to the existence of the glass cover plate, so that certain deviation exists between the result measured by final visual judgment and the actual result.
Although the above two methods can be used to digitize the wet coverage, they all need to rely on the human eye to determine the degree of full coverage. Due to the presence of two types of photoreceptor cells on the retina: rod cells and cone cells. The cone cells can identify color, and the rod cells can sense light. The eyes of the same person are not exactly the same. Some people have large difference in the number and proportion of cone cells or are particularly sensitive to color, so that the difference in color when the left and right eyes look away from each other can be sensed. Moreover, researchers in the united states have found that there are differences in vision between men and women-the vision of men is more sensitive to small details and moving objects and women find color changes more easily. Thus, different people are sensitive to different colors and light. Therefore, the visual judgment has certain subjectivity and uncertainty, and the evaluation result is not objective enough.
The contrast ratio is the ratio of the reflectance of the dry film on a standard blackboard and a standard whiteboard measured with a reflectance meter at a given wet film thickness. The contrast ratio is used for measuring the covering power, and the higher the contrast ratio is, the better the dry film covering effect is. Currently, contrast ratio is one of the fastest and simple methods to evaluate paint dry-out. For example, the GB/T23981-. In addition to the reflectance meter, the contrast ratio can also be measured by a spectrocolorimeter. The accuracy of the spectrocolorimeter is higher than that of the reflectivity, because the spectrocolorimeter is composed of a highly-precise optical structure, the spectrocolorimeter has the advantages of higher accuracy and better consistency, light sources under different scenes can be simulated through parameter setting, and the spectrocolorimeter has better correlation with practical application scenes. However, if the contrast ratio of the wet film is directly tested by adopting a spectrocolorimeter, the following defects exist:
(1) if the wet film is directly attached to the test aperture for testing, the thickness of the periphery of the film is changed by the extrusion of the periphery of the test aperture, which causes test deviation. Meanwhile, the coating film is squeezed to contaminate the inside of the test aperture, which also causes a difference in actual reflectance, thereby causing a test deviation. In addition, repeated cleaning wipes can also present significant challenges to the accuracy and maintenance of the instrument due to contamination of the test wells by the coating.
(2) If the wet film is close to the testing light hole and is not attached to the testing light hole, the light leakage phenomenon can occur, namely: after the incident light irradiated on the surface of the coating film is irradiated to the surface of the coating film, the reflected light cannot be completely received by the receiver, and the light leakage phenomenon causes a phenomenon of large test error.
Disclosure of Invention
The present invention is directed to solving the foregoing problems and providing an apparatus and method for testing the wet film contrast ratio of a coating material that allows for objective and accurate measurement of the wet film contrast ratio. The invention can not only measure the contrast ratio of the wet film corresponding to different coatings and different film thicknesses, but also obtain the covering power of the wet film of the coating through testing and calculation, namely: minimum coating weight and minimum coating weight (g/m) when wet film is completely covered (wet film contrast ratio is more than or equal to 99.5 percent)2) Thickness of film (. mu.m). times.density of coating material (g/cm) at the time of full wet film coverage3). The method has the advantages of simple operation, accurate numerical value, time saving, high efficiency and the like, and avoids the defects that the existing method for evaluating the wet covering power of the coating highly depends on visual judgment, and the visual judgment has certain limitations and subjectivity; meanwhile, the contrast ratio results of the wet films with different film thicknesses can be more comprehensively covered.
The invention not only realizes the control of product quality, but also has very important significance for paint development and practical application construction.
In order to solve the problems, the invention is realized by the following technical scheme:
the device for testing the contrast ratio of the wet coating comprises a cuboid module a with a wedge-shaped groove and a template with two groups of observation round holes;
the cuboid module a with the wedge-shaped groove is half black and half white at the same depth of the bottom of the wedge-shaped groove, and two holes A are respectively arranged outside two end parts of the groove; the measuring range of the thickness of the film suitable for the cuboid module a with the wedge-shaped groove is 50-400 mu m;
the template with two groups of observation round holes is characterized in that two ends of the template are respectively provided with two positioning nails corresponding to the positions and the inner diameters of the holes A, and the lengths of the positioning nails are less than or equal to the depth of the holes A; the two groups of observation round holes respectively correspond to the black part and the white part at the bottom of the wedge-shaped groove. The number of the observation round holes can be set according to actual needs and precision requirements.
The cuboid module with the wedge-shaped groove and the template with the observation round hole are combined with each other, so that the light leakage phenomenon caused when a wet film is close to a test light hole and is not attached to the test light hole for testing can be avoided, the contrast ratio of the paint wet film is tested under different light source conditions by matching with the setting of light source parameters of the spectrocolorimeter, and the contrast ratio test method has relevance to the difference of actual application environments, so that the applicability of the spectrocolorimeter to the paint wet film contrast ratio test is effectively expanded.
The testing device based on the cuboid module a with the wedge-shaped groove and the template with the two groups of observation round holes can simply and quickly measure the contrast ratio of a wet film of the paint with the film thickness within 50-400 mu m, preliminarily determine the film thickness corresponding to the specified wet film contrast ratio, preliminarily evaluate the covering power of the wet film under the relevant condition according to the film thickness (when the specified wet film contrast ratio is more than or equal to 99.5 percent, which is equivalent to the situation of full covering), and simultaneously can quickly and conveniently compare the contrast ratios of the wet films of different paints with the same film thickness, and preliminarily evaluate the quality of the paint.
The testing device for the contrast ratio of the wet coating film of the invention is further optimized as follows:
it still includes the rectangular module group of wedge recess of the meticulous measurement of a plurality of different membrane thickness measurement ranges, is respectively: the cuboid modules b, c, d, e and f of the wedge-shaped groove have corresponding film thickness measurement ranges of 55-82 microns, 80-120 microns, 120-180 microns, 180-270 microns and 270-410 microns.
The optimized testing device for the cuboid module group of the wedge-shaped groove for fine measurement of a plurality of different film thickness measuring ranges is added on the basic testing device, and the cuboid module of the wedge-shaped groove for fine measurement with a suitable film thickness range can be selected according to the result obtained by the basic testing device, so that the measuring precision is improved.
The testing device for the contrast ratio of the wet coating film of the invention is further optimized as follows:
the cuboid module with the wedge-shaped groove is provided with two holes B close to two ends of the wedge-shaped groove respectively, the holes B are correspondingly arranged on the right sides of the holes A, and the distance between the circle center of the corresponding hole B and the circle center of the hole A in the length direction of the template is equal to the radius of the observation round hole in the template.
Wedge recess cuboid module still sets up two holes B respectively near wedge recess both ends except hole A, and the location nail of the template that will observe the round hole moves hole B from hole A, and A is to the radius of B's displacement for observing the round hole, and this equals to remedy the test vacancy of the intermediate position of arbitrary two adjacent observation round holes just, and promotion test accuracy that like this can be further makes the result that corresponds more accurate and comprehensive.
The testing device for the contrast ratio of the wet coating film of the invention is further optimized as follows:
the template is provided with two groups of observation round holes, the round holes in each group of observation round holes are arranged at equal intervals or staggered at equal intervals, and the two groups of observation round holes are same or symmetrical up and down and respectively correspond to the black part and the white part at the bottom of the wedge-shaped groove.
The film thickness of the coating film corresponding to each testing round hole can be found more conveniently by equal-interval arrangement or equal-interval staggered arrangement and the two groups of observing round holes are the same or symmetrical up and down, and the relation between the film thickness and the wet film contrast ratio is conveniently tested and recorded.
The testing device for the contrast ratio of the wet coating film of the invention is further optimized as follows:
the distance between the circle centers of two adjacent observation round holes in each group of observation round holes in the length direction of the template is equal to the diameter of the observation round hole; the diameter of the round hole is equal to that of the color measuring light hole of the color spectrometer; the aperture range is 1-3 cm.
The distance between the circle centers of the two adjacent observation round holes in the length direction of the template is equal to the diameter of the observation round hole so as to cover the result of the contrast ratio of the wet film of each film thickness in the film thickness range; the diameter of the round hole is equal to that of the color measuring light hole of the color measuring spectrometer, so that incident light of the color measuring spectrometer can be more effectively and completely irradiated to the surface of a tested object, and reflected light completely returns to the receiver to reduce test errors; therefore, the aperture range of the observation round hole is consistent with that of the spectrocolorimeter and is about 1-3 cm.
The testing device for the contrast ratio of the wet coating film of the invention is further optimized as follows:
the frame of the cuboid module with the wedge-shaped groove is marked with reading and scale marks corresponding to the depth of the wedge-shaped groove; an indicating line with one end pointing to the circle center of the observation round hole is carved on the template, the other end of the indicating line is perpendicular to a scale mark corresponding to the depth of the wedge-shaped groove in the length direction of the template, and the number of scales pointed by the indicating line is the thickness of the film correspondingly observed by the observation round hole.
The indication lines on the template and the scale marks on the module are used for conveniently finding the film thickness of the coating film corresponding to the observation round hole.
The testing device for the contrast ratio of the wet coating film of the invention is further optimized as follows:
the template is made of stainless steel, glass or hard plastic.
The testing device for the contrast ratio of the wet coating film of the invention is further optimized as follows:
the roughness of the contact surface of the template and the coating is 10-200 mu m.
The template is made of stainless steel, glass or hard plastic, so that the deformation of the surface of the template due to pressure application can be effectively avoided, and the thickness of the membrane is influenced. In order to prevent the contact between the stencil and the paint from affecting the film thickness near the color measurement holes, the test conditions are more preferable when the roughness of the contact surface between the stencil and the paint is 10 to 200 μm.
The invention also relates to a testing method of the testing device based on the paint wet film contrast ratio, which comprises the following steps:
the method comprises the following testing steps:
A. starting a color spectrometer, preheating, setting test parameters and calibrating;
B. adding a proper amount of coating into the deep groove of the cuboid module a with the wedge-shaped groove, and erecting the coating on the frame of the wedge-shaped groove by using a coating scraper plate to scrape the coating from the deepest part to the shallowest part;
C. respectively fixing four positioning nails of a template with two groups of observation round holes in a hole A of a cuboid module a with a wedge-shaped groove;
D. aligning a color measuring unthreaded hole of a light splitting color measuring instrument with an observation round hole on a template, and respectively testing a Y value on a black bottom and a Y value on a white bottom of a coating film in the corresponding observation round hole along the direction from light to deep of a wedge-shaped groove, wherein the Y values are respectively recorded as Yb and Yw;
E. calculating and recording the wet film contrast ratio corresponding to the film thickness of the wet film pointed by different observation round holes,
the testing method is combined with the basic testing device and the spectrocolorimeter, so that the contrast ratio of the wet coating with the film thickness within 50-400 mu m can be simply and quickly measured, the film thickness corresponding to the specified wet film contrast ratio is preliminarily determined, and meanwhile, the contrast ratios of the wet coatings with different thicknesses can be quickly, simply and conveniently compared. The whole process does not need visual judgment, eliminates subjective influence and enables a test result to be more objective.
The test method of the test device based on the paint wet film contrast ratio is further optimized as follows:
after all the steps (A-E) are completed, the method also comprises the following testing steps:
F. finding the film thickness corresponding to the specified wet film contrast ratio, and then finding the cuboid module of the most suitable wedge-shaped groove in the cuboid module group of the wedge-shaped groove for fine measurement in the film thickness measurement range;
G. adding a proper amount of coating into the depth of the wedge-shaped groove of the selected wedge-shaped groove cuboid module which is most suitable for fine measurement, and erecting the coating on the frame of the wedge-shaped groove by using a coating scraper to scrape the coating from the deepest position to the shallowest position;
H. respectively fixing four positioning nails of a template with two groups of observation round holes in the holes A of the cuboid module of the selected wedge-shaped groove which is most suitable for fine measurement;
I. aligning a color measuring light hole of a color spectrometer with the wet film thickness and the observation round holes corresponding to the black bottom and the white bottom of the wet film in the step F on the template, and respectively testing the Y value on the black bottom and the Y value on the white bottom of the coating film in the corresponding observation round holes, and respectively recording the Y values as Yb and Yw;
J. calculating and recording the contrast ratio of the wet film corresponding to different observation round holes,
K. and according to the accurate film thickness corresponding to the film thickness specified by the film thickness corresponding to the observation round hole, the wet film contrast ratio is specified.
The testing method is further optimized after being combined with the optimized testing device, the optimized testing device is provided with a plurality of optimized testing devices for the rectangular module groups of the wedge-shaped grooves for fine measurement in different film thickness measuring ranges, and meanwhile, the optimized testing device is combined with the spectrocolorimeter with excellent testing precision. According to the optimized test method, the wedge-shaped groove cuboid module with the film thickness range more suitable for fine measurement can be selected according to the result obtained by the basic test device, so that the measurement precision is improved, and meanwhile, the requirements that the test result is subject to elimination and subjective judgment and the test result is more objective are met. The theoretical test median error is reduced from 15% for the base test unit to 4% for the optimized unit.
The test method of the test device based on the paint wet film contrast ratio is further optimized as follows:
after all the steps (A-K) are completed, the method also comprises the following testing steps:
repeating steps G to K, wherein the holes A in the step H are changed into holes B, and calculating to obtain more accurate film thickness of the specified wet film contrast ratio.
The testing method is further optimized after being combined with a more optimized testing device, and two holes B are respectively arranged at two ends of the wedge-shaped groove cuboid module close to the wedge-shaped groove except for the hole A. After the optimized test method is completed, the step of moving the positioning nail of the template for observing the round hole from the hole A to the hole B and the subsequent test step are added, so that the film thickness range can be more comprehensively covered, and the test precision can be further improved. The error of the theoretical test intermediate value is further reduced to 2 percent. Meanwhile, the combination of the spectrocolorimeter can avoid the influence of subjective judgments such as different degrees of visual sensitivity and the like on visual judgments.
The test method of the test device based on the paint wet film contrast ratio is further optimized as follows:
when the specified wet film contrast ratio is calculated to be more than or equal to 99.5%, the corresponding wet film thickness can be used for evaluating the wet film covering power, namely: minimum coating weight and minimum coating weight (g/m) when wet film is completely covered (wet film contrast ratio is more than or equal to 99.5 percent)2) Thickness of film (. mu.m). times.density of coating material (g/cm) at the time of full wet film coverage3)。
By adopting the testing device, different testing devices can be selected according to different requirements on the precision of the testing result. By adopting the basic testing device, the wet covering condition of one or more coatings can be evaluated quickly, simply and conveniently and accurately. And if further requirements on precision are required, the coating wet film contrast ratio corresponding to the coating wet film within the film thickness test range can be found by combining an optimization test device of a cuboid module group of the wedge-shaped groove containing a plurality of finely measured film thickness measurement ranges. The precision is further required, the test result corresponding to the hole B in the test module can be supplemented, and the wet film contrast ratio results corresponding to different film thicknesses can be more comprehensively covered. By adopting the optimized testing device, the wet covering condition of one or more coatings can be evaluated more quickly, simply and accurately in numerical value and efficiently in a time-saving manner.
By adopting the testing device and the testing method for the contrast ratio of the wet coating of the coating, the wet covering condition of one or more coatings is evaluated according to the testing result and the accurate film thickness corresponding to the specified contrast ratio of the wet coating obtained by calculation; when the contrast ratio of the specified wet film is more than or equal to 99.5 percent (equivalent to the condition of full coverage), the method can replace the existing standard visual method, and can avoid the defects that the existing evaluation method of the wet coverage of the coating highly depends on visual judgment, and the visual judgment has certain limitations and subjectivity; meanwhile, the contrast ratio results of the wet films with different film thicknesses can be more comprehensively covered.
The testing device can effectively improve the testing precision by combining with a high-precision optical instrument spectrocolorimeter, and avoids errors caused by visual judgment in the testing method GB 1726-79(89) of the coating covering power and the judgment of the wet covering testing result of the wedge-shaped wet film covering power instrument. Meanwhile, the problem that the spectrocolorimeter is not suitable for directly testing the contrast ratio of the coating wet film is solved. The invention can also select the contrast ratio of the wet coating under different light source conditions by selecting the setting of the light source parameters of the spectrocolorimeter, for example, the change of wet covering under sunlight, fluorescent lamps, tungsten lamps and other light sources, which has more relevance with the difference of actual application environments, thereby effectively expanding the applicability of the spectrocolorimeter to the test of the contrast ratio of the wet coating.
Drawings
FIG. 1 is a schematic structural diagram of a rectangular parallelepiped block group (rectangular parallelepiped blocks a to f) of a wedge-shaped groove of a device for testing the contrast ratio of a wet paint film according to the present invention.
Fig. 2 is a schematic structural view of another viewing angle of the rectangular parallelepiped block groups (rectangular parallelepiped blocks a to f) of the wedge-shaped grooves of the apparatus for testing the contrast ratio of a wet paint film according to the present invention.
FIG. 3 is a schematic structural diagram of a template with two sets of observation round holes of the device for testing the contrast ratio of a wet coating film.
Fig. 4 is a schematic structural diagram of another viewing angle of a template with two groups of observation round holes of the testing device for the contrast ratio of the wet coating film.
Description of the figure numbers:
1-cuboid module 2-wedge-shaped groove 3-hole A4-hole B
5-template 6-observation round hole 7-positioning nail 8-indicating line
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. The simple improvement of the preparation method of the invention on the premise of the conception of the invention belongs to the protection scope of the invention.
Example 1
The wet film contrast ratios corresponding to the different film thicknesses of product sample a paint were tested and the film thickness of product sample a paint was found at a wet film contrast ratio of about 98%.
The specific test steps are as follows:
A. starting a color spectrometer, preheating, setting test parameters and calibrating;
B. adding a proper amount of coating into the deep groove of the cuboid module a with the wedge-shaped groove 2, and erecting the coating on the frame of the wedge-shaped groove 2 by using a coating scraper to scrape the coating from the deepest part to the shallowest part;
C. respectively fixing four positioning nails 7 of a template 5 with two groups of observation round holes 6 in holes A3 of a cuboid module a with a wedge-shaped groove 2;
D. aligning a color measuring unthreaded hole of a light splitting color measuring instrument with an observation round hole 6 on a template 5, and respectively testing a Y value on a black bottom and a Y value on a white bottom of a coating film in the corresponding observation round hole 6 along the direction from light to deep of the wedge-shaped groove 2, wherein the Y values are respectively recorded as Yb and Yw;
E. calculating and recording the wet film contrast ratio corresponding to the wet film thickness pointed by different observation round holes 6,
examples 2 and 3 the test apparatus and method of example 1 was operated with specific reference to the parameters of table 1 and the data recorded while finding the corresponding wet film thickness near 98%.
Table 1: EXAMPLES 1 to 3 parameter description
| Examples | Coating material | Hole(s) | Wedge-shaped groove module |
| Example 1 | Product A | A | a |
| Example 2 | Product B | A | a |
| Example 3 | Product C | A | a |
Example 4
Product a was tested for accurate film thickness at a wet film contrast ratio of about 98.0%.
The specific test steps are as follows:
it also included the following test steps after completion of all steps (a-E) in example 1:
F. when the contrast ratio of the found film thickness wet film is about 98%, correspondingly observing the suitable film thickness corresponding to the round hole 6, and then finding the cuboid module 1 of the most suitable wedge-shaped groove in the cuboid module group of the wedge-shaped groove for fine measurement in the film thickness measurement range;
G. adding a proper amount of coating into the depth of the wedge-shaped groove of the selected wedge-shaped groove cuboid module 1 which is most suitable for fine measurement, and erecting the coating on the frame of the wedge-shaped groove by using a coating scraper to scrape the coating from the deepest position to the shallowest position;
H. respectively fixing four positioning nails 7 of the template 5 with two groups of observation round holes 6 in holes A3 of the cuboid module 1 of the wedge-shaped groove which is selected to be most suitable for fine measurement;
I. aligning a color measuring unthreaded hole of a light splitting color measuring instrument to an observation round hole 6 corresponding to a template 5 with the contrast ratio of about 98 percent and a black bottom and a white bottom, and respectively testing a Y value on the black bottom and a Y value on the white bottom of a coating film in the corresponding observation round hole 6 and respectively recording the Y values as Yb and Yw;
J. calculating and recording the contrast ratio of the wet film corresponding to different observation round holes 6,
K. and finding out the accurate film thickness corresponding to the contrast ratio of the wet film of about 98.0% according to the film thickness corresponding to the observation round hole 6.
Examples 5 and 6 the test apparatus and method of example 4 were operated in accordance with the parameters set forth in Table 2 and reported as accurate film thickness corresponding to a wet film contrast ratio of about 98.0%.
Table 2: EXAMPLES 4 to 6 parameter description
Example 7
Further refinement tests more accurate film thickness of product a at a wet film contrast ratio of 98.0%. The specific test steps are as follows:
after all the steps (A-K) in example 4 were completed, the following test steps were also included:
repeating steps G to K, wherein the holes A3 in step H are changed to holes B4, and calculating to obtain more accurate film thickness when the wet film contrast ratio is 98.0%.
Examples 8 and 9 the test apparatus and method of example 7 were operated in accordance with the parameters set forth in Table 3 and the more accurate film thickness was recorded at a wet film contrast ratio of 98.0%.
Table 3: EXAMPLES 7-9 parameter description
| Examples | Coating material | Wet film contrast ratio requirement | Hole(s) | Refined wedge-shaped groove module |
| Example 7 | Product A | 98.0％ | B | b or c or d or e or f |
| Example 8 | Product B | 98.0％ | B | b or c or d or e or f |
| Example 9 | Product C | 98.0％ | B | b or c or d or e or f |
Example 10
Test product a wet film hiding power, i.e.: minimum coating weight and minimum coating weight (g/m) of product A when wet film is completely covered (the contrast ratio of the wet film is more than or equal to 99.5 percent)2) Thickness of film (. mu.m). times.density of coating material (g/cm) at the time of full wet film coverage3). Specific test procedure referring to example 7, the specified wet film contrast ratio was adjusted from 98.0% to 99.5%, and the corresponding wet film thickness was found. And then according to the minimum coating weight formula, corresponding wet film covering power data can be obtained through calculation.
Examples 11 and 12 the test apparatus and method of example 9 was followed with specific reference to the parameters of table 4 and the wet hiding power results for the different products were calculated.
Table 4: EXAMPLES 10 to 12 parameter description
Comparative example 1
The comparative example was carried out according to the method A (brush coating) in GB 1726-79 (89). Namely: the total weight of the paint cup and paint brush containing product a was weighed on a 0.01 gram scale. And uniformly brushing the coating of the product A on a glass black and white board by using a coating brush, placing the glass black and white board in a dark box at a distance of 15-20 cm from a ground glass sheet, enabling one end of the black and white grid board to incline to form a 30-45-degree intersection angle with a plane, observing under 1 and 2 fluorescent lamps, and taking the end point that the black and white grid can not be seen right now. The cup and brush with the remaining paint were then weighed to determine the weight of the paint on the black and white grid.
In the formula: w1-total weight of cup and paint brush with paint before brushing, g;
w2-total weight of cup and paint brush with residual paint after painting, g;
s-area of painted black and white grid, cm2
The results are measured in duplicate and the difference is no greater than 5% of the average, the average is taken, otherwise the test must be repeated.
Comparative examples 2 and 3
The test apparatus and method of comparative example 1 were operated with specific reference to the parameters of table 5, and the results were recorded and compared.
Table 5: comparative examples 1 to 3 parameter description
Comparative example 4
The comparative example adopts a wedge-shaped wet covering tester for testing, and the specific operation steps are as follows:
the black matrix of the black and white substrate was placed on the left side of the viewer, the spiked side of the wedge of glass was placed at the white matrix, and the light source was on the left side. An appropriate amount of coating product a was dropped at the black and white boundary, the amount of product a being sufficient to spread without overflowing. The wedge-shaped glass plate was lightly pressed by hand and moved back and forth over a black and white substrate to spread the coating evenly. The wedge-shaped glass piece is slowly moved to the left until the black and white margin disappears. The reading on the corresponding black matrix scale line on the left side of the wedge-shaped glass sheet at that time is read and recorded as the vanishing point. And moving the wedge-shaped glass sheet 4-5mm to the left, moving the wedge-shaped glass sheet to the right in a reverse direction until a black-white boundary appears again, reading the reading on the scale line of the black bottom corresponding to the left side of the wedge-shaped glass sheet at the moment, and recording the reading as an appearance point. Cleaning the black and white bottom plate and the glass sheet. Repeating the above operations at least three times, exchanging the left and right positions of the black and white bottom plate, and testing for three times. The above six data were obtained and the average was obtained. The minimum paint usage of the coating corresponding to this average is found from a calibration and paint usage comparison table provided by the instrument supplier.
Comparative examples 5 and 6
The test apparatus and method of comparative example 4 was operated with specific reference to the parameters of Table 6.
Table 6: comparative examples 4 to 6 parameter description
Test example 1
This test example examines examples 1 to 9, namely: the results are shown in table 7, where the relationship between the wet film contrast ratio and the paint wet film thickness and the film thickness corresponding to the specified contrast ratio are obtained by combining different testing devices and methods according to different requirements on the accuracy of the test results.
Table 7: examples 1 to 9 test results
From the above test results, it can be seen that the accuracy results of the corresponding relationship between the contrast ratio of the wet coating film and the film thickness of the wet coating film measured in examples 1 to 9 of the present invention vary with the adjustment of the test parameters.
Examples 1-3 used block a, and the corresponding hole of the test template 5 was a, and the corresponding test range was wider, and the film thickness of the wet film corresponding to the specified wet film contrast ratio could be preliminarily determined.
Examples 4-6 refined measurements were performed based on the preliminary conclusions obtained in examples 1-3, and wedge-shaped modules with more suitable film thickness ranges were selected to obtain accurate wet film thicknesses corresponding to the specified wet film contrast ratios.
In examples 7 to 9, based on examples 4 to 6, the position of the movable template 5 is shifted from a to B, and the displacement from a to B is exactly equal to the test gap which makes up the middle position of any two adjacent observation circular holes 6, so that the measurement result can be further refined, and the accurate wet film thickness corresponding to the specified contrast ratio can be obtained.
Test example 2
This test example examines the correlation of the wet hiding power of examples 10 to 12 and comparative examples 1 to 3 and comparative examples 4 to 6 and the convenience of the test method.
Table 8: test results of examples 1-9 and comparative examples 1-3 and comparative examples 4-6, wet coverage quantification results calculation, and time consumption recording:
examples 10-12 of the above data are the apparatus and method for testing the wet film contrast ratio employed in the present invention. When the contrast ratio of the wet film of the tested product A, B, C is more than or equal to 99.5%, the corresponding film thickness of the wet film is calculated to obtain the minimum coating weight corresponding to the film thickness, namely: wet masking. Compared with the test method GB 1726-79(89) for wet coating coverage adopted in comparative examples 1-3 and the wedge-shaped wet film coverage instrument adopted in comparative examples 4-6, the method has the characteristics of more time saving and more convenience, saves the test time by 50%, and avoids errors possibly caused by visual judgment in the result judgment of the test method GB 1726-79(89) for wet coating coverage and the wedge-shaped wet film coverage instrument.
Table 9: pearson correlations for the test methods of examples 1-9 and comparative examples 1-3 and comparative examples 4-6
The above data evaluate the correlation of the wet hiding of the coatings measured in examples 10-12 with the wet hiding test measured in comparative examples 1-3 and comparative examples 4-6, and the results show that the pearson correlation is strong. The coating hiding power test result obtained by the invention has strong correlation with the wet hiding power measured by the coating wet hiding test method GB 1726-79(89) and a wedge-shaped wet film hiding power instrument, and can be used for replacing the wet hiding test.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; those skilled in the art should also realize that such equivalent variations, modifications, and alterations are possible in light of the above teachings without departing from the spirit and scope of the present invention; meanwhile, any equivalent changes, modifications and evolution made to the above embodiments according to the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The experimental method of the present invention, in which the specific conditions are not specified, is generally carried out under the conventional conditions or the conditions recommended by the manufacturers.
The various optimized technical schemes in the invention can be combined with each other unless otherwise stated.
Unless otherwise indicated, percentages and parts are percentages and parts by weight.
The experimental procedures described in the specification and examples, which do not specify specific conditions, are generally carried out under the conditions which are customary or recommended by the manufacturers.
The various starting materials, reagents, components used in the present invention are, unless otherwise indicated, the corresponding starting materials commonly used in the art.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention.
Claims (10)
1. A testing device for the contrast ratio of a wet coating film is characterized in that:
the device comprises a cuboid module a with a wedge-shaped groove and a template with two groups of observation round holes;
the cuboid module a with the wedge-shaped groove is half black and half white at the same depth of the bottom of the wedge-shaped groove, and two holes A are respectively arranged outside two end parts of the groove; the measuring range of the thickness of the film suitable for the cuboid module a with the wedge-shaped groove is 50-400 mu m;
the template with two groups of observation round holes is characterized in that two ends of the template are respectively provided with two positioning nails corresponding to the positions and the inner diameters of the holes A, and the lengths of the positioning nails are less than or equal to the depth of the holes A; the two groups of observation round holes respectively correspond to the black part and the white part at the bottom of the wedge-shaped groove.
2. The device for testing the contrast ratio of a wet coating according to claim 1, wherein:
it still includes the rectangular module group of wedge recess of the meticulous measurement of a plurality of different membrane thickness measurement ranges, is respectively: the cuboid modules b, c, d, e and f of the wedge-shaped groove have corresponding film thickness measurement ranges of 55-82 microns, 80-120 microns, 120-180 microns, 180-270 microns and 270-410 microns.
3. The device for testing the contrast ratio of a wet coating according to claim 2, wherein:
the cuboid module with the wedge-shaped groove is provided with two holes B close to two ends of the wedge-shaped groove respectively, the holes B are correspondingly arranged on the right sides of the holes A, and the distance between the circle center of the corresponding hole B and the circle center of the hole A in the length direction of the template is equal to the radius of the observation round hole in the template.
4. The device for testing the contrast ratio of a wet coating according to claim 1, wherein:
the template is provided with two groups of observation round holes, the round holes in each group of observation round holes are arranged at equal intervals or staggered at equal intervals, and the two groups of observation round holes are same or symmetrical up and down and respectively correspond to the black part and the white part at the bottom of the wedge-shaped groove.
5. The device for testing the contrast ratio of a wet coating according to claim 4, wherein:
the distance between the circle centers of two adjacent observation round holes in each group of observation round holes in the length direction of the template is equal to the diameter of the observation round hole; the diameter of the round hole is equal to that of the color measuring light hole of the color spectrometer; the aperture range is 1-3 cm.
6. The device for testing the contrast ratio of a wet coating according to claim 1, wherein:
the frame of the cuboid module with the wedge-shaped groove is marked with reading and scale marks corresponding to the depth of the wedge-shaped groove; an indicating line with one end pointing to the circle center of the observation round hole is carved on the template, the other end of the indicating line is perpendicular to a scale mark corresponding to the depth of the wedge-shaped groove in the length direction of the template, and the number of scales pointed by the indicating line is the thickness of the film correspondingly observed by the observation round hole.
7. The device for testing the contrast ratio of a wet coating according to claim 1, wherein: the template is made of stainless steel, glass or hard plastic.
8. A test method based on the test device for the paint wet film contrast ratio of any one of claims 1, 4 to 7, which is characterized by comprising the following steps:
the method comprises the following testing steps:
A. starting a color spectrometer, preheating, setting test parameters and calibrating;
B. adding a proper amount of coating into the deep groove of the cuboid module a with the wedge-shaped groove, and erecting the coating on the frame of the wedge-shaped groove by using a coating scraper plate to scrape the coating from the deepest part to the shallowest part;
C. respectively fixing four positioning nails of a template with two groups of observation round holes in a hole A of a cuboid module a with a wedge-shaped groove;
D. aligning a color measuring unthreaded hole of a light splitting color measuring instrument with an observation round hole on a template, and respectively testing a Y value on a black bottom and a Y value on a white bottom of a coating film in the corresponding observation round hole along the direction from light to deep of a wedge-shaped groove, wherein the Y values are respectively recorded as Yb and Yw;
E. calculating and recording the wet film contrast ratio corresponding to the film thickness of the wet film pointed by different observation round holes,
9. a test method based on the test device for the paint wet film contrast ratio of any one of claims 2, 4 to 7, characterized in that:
which, after completing all the steps of claim 8, further comprises the following test steps:
F. finding the film thickness corresponding to the specified wet film contrast ratio, and then finding the cuboid module of the most suitable wedge-shaped groove in the cuboid module group of the wedge-shaped groove for fine measurement in the film thickness measurement range;
G. adding a proper amount of coating into the depth of the wedge-shaped groove of the selected wedge-shaped groove cuboid module which is most suitable for fine measurement, and erecting the coating on the frame of the wedge-shaped groove by using a coating scraper to scrape the coating from the deepest position to the shallowest position;
H. respectively fixing four positioning nails of a template with two groups of observation round holes in the holes A of the cuboid module of the selected wedge-shaped groove which is most suitable for fine measurement;
I. aligning a color measuring light hole of a color spectrometer with the wet film thickness and the observation round holes corresponding to the black bottom and the white bottom of the wet film in the step F on the template, and respectively testing the Y value on the black bottom and the Y value on the white bottom of the coating film in the corresponding observation round holes, and respectively recording the Y values as Yb and Yw;
J. calculating and recording the contrast ratio of the wet film corresponding to different observation round holes,
K. and finding out the accurate film thickness corresponding to the specified wet film contrast ratio according to the film thickness corresponding to the observation round hole.
10. A testing method based on the testing device for the paint wet film contrast ratio of any one of claims 3 to 7, characterized in that:
which, after completing all the steps of claim 9, further comprises the following testing steps:
and D, repeating the steps G to K, wherein the holes A in the step H are changed into the holes B, and calculating to obtain more accurate wet film thickness corresponding to the specified wet film contrast ratio.
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