An apparatus and method for testing the volume solids content of a coating and the density of a dried coating

Abstract

The application relates to a device and a method for testing the volume solid content of paint and the density of a dry coating layer, the volume of the dry coating layer is obtained by using the Archimedes principle, and the volume solid content of the paint and the density of the dry coating layer are further obtained by calculation; the device is simple, easy to operate, and simple in steps, and the testing of the volume solid content of the paint and the density of the dry coating layer can be completed in a short time; in addition, the experimental data obtained in the application is obtained through a plurality of scientific calculations on the basis of less test data, the influence of human factors on the accuracy of the experimental data is avoided, the experimental error can be effectively reduced, and the data accuracy is increased.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of paint detection equipment, and particularly relates to a device and method for testing the volume solid content of paint and the density of a dry coating. BACKGROUND

[0002] The method commonly used in the paint industry for testing the volume solid content of paint and the density of a coating is the method recorded in GB / T9272-2007. However, through long-term practice, it has been found that this method has many shortcomings, such as complicated operation. The tester needs to first weigh the mass of a painted object in air, then test the mass of the painted object in an immersion liquid, and then perform dipping and film throwing after the painted object is dried to obtain a uniform coating. After drying under specified drying conditions, the mass of the painted object in air and the immersion liquid needs to be weighed again, and finally calculation is performed. The entire process has many operation links and complicated steps, and requires extremely high skills of the operator. SUMMARY

[0003] The present application solves the technical problem of providing a device and method for testing the volume solid content of paint and the density of a dry coating, which is easy to operate, simple in steps, can effectively reduce experimental errors, and further increase the accuracy of data.

[0004] The technical solution adopted by the present application to solve the technical problem is a device for testing the volume solid content of paint and the density of a dry coating, comprising a weighing device, a container placed on the weighing device, and a hanging assembly arranged above the container. The hanging assembly comprises a receiving member for placing a dry coating. When the dry coating is placed in the receiving member for weighing, the dry coating can be suspended in the liquid in the container.

[0005] Further, the device for testing the volume solid content of paint and the density of a dry coating further comprises a support table and a cantilever matched with the support table.

[0006] Further, the support table comprises a base and a support column arranged on the base.

[0007] Further, the cantilever is provided with a sleeve matched with the support column and used for controlling the lifting of the cantilever, and the sleeve is further provided with a locking member used for fixing the cantilever.

[0008] Further, the hanging assembly further comprises a connecting member connected with the receiving member.

[0009] Further, the device for testing the volume solid content of paint and the density of a dry coating further comprises a wind shield arranged around the weighing device and the container.

[0010] Further, the wind shield comprises a first wind shield plate and a second wind shield plate.

[0011] Further, the receiving member comprises a mesh basket, a connecting ring and a cover installed on the mesh basket, and a counterweight ring placed in the mesh basket.

[0012] A method for testing the volume solid content of a coating and the density of a dry coating,

[0013] The specific steps are as follows:

[0014] 1) Test the volume V of the wet coating 湿 ;

[0015] 2) Test the volume V of the dry coating 干 ;

[0016] First, immerse the receiving member completely into the liquid in the container, zero the reading of the scale after stabilization, then take out the receiving member and add the dry coating into the receiving member, then immerse the receiving member loaded with the dry coating completely into the liquid in the container, record the reading of the scale after stabilization, which is the mass of the volume of the dry coating displacing the liquid, according to the density of the liquid, the volume of the dry coating displacing the liquid can be obtained, which is the volume V of the dry coating 干 ;

[0017] 3) Calculate the volume solid content NV of the dry coating;

[0018] According to the formula

[0019]

[0020] Substitute V 湿 obtained in step 1) and V 干 obtained in step 2) into the above formula, and NV can be obtained.

[0021] Further, the steps for obtaining the density of the dry coating are as follows:

[0022] Weigh the dry coating with the scale and obtain the mass of the dry coating;

[0023] and obtain the density of the dry coating through V 干 measured in step 2).

[0024] The beneficial effects of the present application are:

[0025] The device and method for testing the volume solid content of paint and the density of dry coating layer of the present application utilize the Archimedes principle to obtain the volume of dry coating layer, and further obtain the volume solid content of paint and the density of dry coating layer through calculation, which is simple in device, easy in operation, simple in steps, and can complete the test of the volume solid content of paint and the density of paint coating layer in less time. In addition, the experimental data obtained in the present application is obtained through multi-step scientific calculation on the basis of less test data, which avoids the influence of human factors on the accuracy of experimental data, effectively reduces experimental error, and further increases the accuracy of data. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in combination with the drawings and examples.

[0027] Figure 1 is a schematic diagram of the device for testing the volume solid content of paint and the density of paint coating layer;

[0028] Figure 2 is Figure 1 a schematic diagram of the cover in the present application;

[0029] Figure 3 is Figure 1 a schematic diagram of the counterweight ring in the present application;

[0030] Figure 4 is Figure 1 a schematic diagram of the first wind shield in the present application;

[0031] Figure 5 is Figure 1 a schematic diagram of the second wind shield in the present application.

[0032] In the drawings:

[0033] supporting table 1, supporting column 11, base 12, cantilever 2, sleeve 21, locking part 22, suspension assembly 3, connecting part 31, receiving part 32, net basket 321, connecting ring 322, cover 323, counterweight ring 324, weighing device 4, container 5, wind shield 6, supporting frame 61, first wind shield 62, second wind shield 63, round hole 631. DETAILED DESCRIPTION

[0034] The present application will now be described in detail in combination with the drawings. The drawing is a simplified schematic diagram, which only schematically illustrates the basic structure of the present application, and therefore only shows the components related to the present application.

[0035] An apparatus for testing the volume solids content and dry coating density of a coating according to the present invention includes a support platform 1, a cantilever 2 disposed on the support platform 1, a suspension assembly 3 connected to the cantilever 2, a weighing device 4 disposed below the suspension assembly 3, a container 5 placed on the weighing device 4, and a windproof cover 6 disposed around the weighing device 4 and the container 5, wherein the container 5 is used to hold a liquid of known density.

[0036] like Figure 1 As shown, the support platform 1 includes a base 12 and a support column 11 disposed on the base 12, wherein the support column 11 is detachably mounted on the base 12.

[0037] like Figure 1 As shown, one end of the cantilever 2 is provided with a sleeve 21 that cooperates with the support column 11 to control the lifting and lowering of the cantilever 2, and a locking member 22 for fixing the cantilever 2 is provided on the sleeve 21.

[0038] like Figures 1-3 As shown, the suspension assembly 3 includes a connector 31 and a receiving member 32 disposed at one end of the connector 31. The other end of the connector 31 is connected to the cantilever 2. The receiving member 32 includes a basket 321, a connecting ring 322 mounted on the basket 321 and fixedly connected to the connector 31, a cover 323 for sealing objects placed inside the basket 321, and a counterweight ring 324 placed inside the basket 321. The basket 321 is generally cylindrical, and water holes for water supply are evenly provided on the side walls and bottom walls of the basket 321. In this embodiment, the connector 31 is a flexible thread and is waterproof.

[0039] like Figure 1 , Figure 4 , Figure 5 As shown, the windproof cover 6 is roughly a rectangular cover-like body, including a support frame 61, a first windproof plate 62 installed on the side of the support frame, and a second windproof plate 63 installed on the top of the support frame 61. The first windproof plate 62 and the second windproof plate 63 are both made of transparent material and are slidably connected to the support frame 61. The first windproof plate 62 is integral and can slide in one direction, while the second windproof plate 63 is separate and can slide in both directions to facilitate the passage of the receiving member 32. A circular hole 631 for the connecting member 31 to pass through is also provided in the middle of the second windproof plate 63.

[0040] The specific steps for testing the volume solids content and coating density of a coating using the aforementioned apparatus are as follows:

[0041] 1) Test the volume V of the wet coating 湿 ;

[0042] First, the paint to be tested is stirred evenly, and then its density is tested with a density cup, and is recorded as p; then a polytetrafluoroethylene sample disc with a bottom area of 6 cm x 6 cm is weighed with the weighing device 4, and the mass is recorded as m1; then an appropriate amount of sample is evenly spread on the sample disc, and the mass is weighed with the weighing device 4, and the total mass of the sample disc and the sample is recorded as m2; the volume V of the wet coating is calculated according to the formula 湿 ;

[0043]

[0044] 2) Test the volume V of the dry coating 干 ;

[0045] First, the sample disc coated with paint in step 1) is cured under specified curing conditions for a period of time, and after the paint is dry, the mass is weighed with the weighing device 4, and is recorded as m3;

[0046] Then, the first wind shield 62 of the wind shield 6 is opened, the container 5 with an appropriate amount of water is placed on the weighing device 4, then the second wind shield 63 is opened and the height of the cantilever 2 is adjusted, the mesh basket 321 with the counterweight ring 324 is completely immersed in the water in the container 5, and it is ensured that the mesh basket 321 does not contact the side wall and bottom wall of the container 5, in this state, the weighing device 4 is zeroed; then the second wind shield 63 is opened again and the height of the cantilever 2 is adjusted, the mesh basket 321 is lifted and a mark is made at the boundary of the water connection piece 31;

[0047] Finally, the dry coating on the sample disc is peeled off and cut into small pieces and placed in the mesh basket 3, and the height of the cantilever 2 is adjusted so that the mesh basket 3 is immersed in water until the mark of the connection piece 31, then the second wind shield 63 is closed, and after the weighing device 4 is stable, the reading m4 of the weighing device 4 at this time is recorded;

[0048] According to the Archimedes principle

[0049]

[0050] The volume V of the dry coating can be calculated 干

[0051]

[0052] 3) Calculate the volume solid content of the paint and the density of the dry coating

[0053] According to the above data, the volume solid content NV of the paint and the density of the dry coating can be calculated p 0

[0054]

[0055]

[0056] In addition, if the above coating is a uniformly distributed dry coating, a portion of the dry coating can be tested. First, weigh the portion of the dry coating in the air and record the reading of the weighing device 4 as m5. Then weigh the portion of the dry coating in water and record the reading of the weighing device 4 as m6.

[0057] Based on the above data, the mass m5 of the aforementioned dry coating in the wet coating state can be calculated. 湿

[0058] Depend on

[0059]

[0060] have to

[0061]

[0062] The volume V5 of the aforementioned dry coating in the wet coating state 湿

[0063] Depend on

[0064]

[0065] have to

[0066]

[0067] The above-mentioned dry coating volume V5 干

[0068]

[0069] From this, the volume solids content (NV) of the coating and the density of the dry coating can be calculated. p 0

[0070]

[0071]

[0072] This invention provides an apparatus and method for testing the volume solids content and density of a coating. It utilizes Archimedes' principle to obtain the volume of the dry coating and further calculates the volume solids content and density of the dry coating. The apparatus is simple, easy to operate, and the steps are straightforward. It can complete the testing of the volume solids content and density of the coating in a relatively short time. Furthermore, the experimental data obtained in this invention are derived from multiple scientific calculations based on a limited amount of test data, avoiding the influence of human factors on the accuracy of the experimental data, effectively reducing experimental errors, and thus increasing the accuracy of the data.

[0073] The above is the ideal embodiment of the present application, and the above description can be changed and modified without departing from the scope of the present application. The technical scope of the present application is not limited to the above description, and should be determined by the scope of the claims.

Claims

1. A method for testing the volume solid content of a coating and the density of a dry coating, characterized in that, The specific steps are as follows: (1) Test the volume of the wet coating V 湿 : First, stir the coating to be tested evenly, then test its density with a density cup, denoted as p; then take a polytetrafluoroethylene sample plate with a bottom area of 6 cm x 6 cm, weigh it with a scale, denoted as m1; then evenly spread an appropriate amount of sample on the sample plate and weigh it with a scale, the total mass of the sample plate and the sample is denoted as m2; The volume V of the wet coating is obtained according to the formula 湿 ; ； (2) testing the volume V of the dry coating 干 : First, the sample plate coated with the coating in step (1) is cured under specified curing conditions for a period of time, and after the coating is dry, the mass is weighed with a scale, denoted as m3; Then, open the first wind shield of the wind shield, place the container with appropriate amount of water on the scale, then open the second wind shield and adjust the height of the cantilever, immerse the net basket with counterweight ring into the water in the container completely, and ensure that the net basket does not contact the side wall and bottom wall of the container, in this state, return the scale to zero; then open the second wind shield and adjust the height of the cantilever, lift the net basket and make a mark at the limit of the connecting piece into the water; Finally, peel off the dry coating on the sample plate and cut it into small pieces and place it in the net basket, adjust the height of the cantilever so that the net basket is immersed in water until the mark of the connecting piece, then close the second wind shield, after the scale is stable, record the reading of the scale at this time m4; According to the Archimedes principle ， i.e. the volume V of the dry coating is calculated 干 ； 3) Calculate the volume solid content of the coating and the density of the dry coating: From the above data the paint volume solids content NV and the density of the dry coating can be calculated p 0 。

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