Non-volatile Matter Accumulation Volume Fraction Measuring Device and Measuring Method

Abstract

The present invention discloses a device and a method for measuring the stacking volume fraction of non-volatile matter. The measuring device includes a scraper body, a coating box, and a sealing component. A receiving blind groove is provided on the upper surface of the scraper body; the coating box is adapted to be fitted on the upper surface of the scraper body. A surrounding cavity is provided in the coating box. The coating box has a placement position on the scraper body. When the coating box is in the placement position on the scraper body, the surrounding cavity and the receiving blind groove are communicated with each other and are adapted to be filled with the material to be measured; the sealing component is installed on the coating box and is adapted to compact and seal the surrounding cavity and the receiving blind groove filled with the material to be measured when the coating box is in the placement position; wherein, the coating box is adapted to be slid on the scraper body to scrape off the material to be measured located outside the receiving blind groove after the surrounding cavity and the receiving blind groove filled with the material to be measured are sealed. The present invention can measure without diluting the coating stock solution, is particularly suitable for measuring the stacking volume fraction of non-volatile matter of the material to be measured with medium to high viscosity, and is convenient to use.

Description

Technical Field

[0001] The present invention relates to a device and a method for measuring the stacking volume fraction of non-volatile substances. Background Art

[0002] At present, solvents and some volatile additives in coatings will continuously volatilize during the film-forming process of the coatings. After the volatiles have completely volatilized, a dry film layer with certain strength and having decorative, protective and other functions composed of stacked non-volatile substances such as resins, pigments, and fillers is formed on the surface of the coated object. The stacking volume fraction of non-volatile substances in the coatings directly affects the coating consumption cost, the coating production efficiency, the thickness of the dry film layer, and the protective performance of the protective layer. Chinese Patent with Publication No. CN110824149B discloses a method for measuring the volume solids content of non-volatile substances in coatings, in which it is disclosed that a wet film is made in the open cavity of a carrier plate with a square cross-section, and then the excess coating is scraped off. After drying the wet film to form a dry film, the volume solids content of non-volatile substances in the coatings is measured. This method is applicable to the measurement of low-viscosity coatings (viscosity is 20-30 Pa·s), and cannot be directly applied to medium- and high-viscosity liquid coatings, inks, liquid resins, and liquid-solid mixtures. When encountering medium- and high-viscosity liquid coatings or inks or liquid resins or homogeneous liquid-solid mixtures, if directly scraped, due to the action of internal shear force of the liquid, the thickness of the wet film formed by scraping is lower than the set thickness, affecting the accuracy of the measurement result. It is only possible to obtain relatively accurate results by diluting the sample with a suitable solvent to 20-30 Pa·s by volume ratio. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a device for measuring the stacking volume fraction of non-volatile substances, which can be measured without dilution of the stock solution, is particularly suitable for measuring the stacking volume fraction of non-volatile substances in medium- and high-viscosity liquid coatings, inks, liquid resins, and homogeneous liquid-solid mixtures, and is convenient to use.

[0004] To solve the above technical problem, the technical solution of the present invention is: a device for measuring the stacking volume fraction of non-volatile substances, comprising:

[0005] A scraper body, on the upper surface of which there is a receiving blind groove;

[0006] A coating box, which is adapted to be fitted on the upper surface of the scraper body. There is a surrounding cavity in the coating box. The coating box has a placement position on the scraper body. When the coating box is in the placement position on the scraper body, the surrounding cavity and the receiving blind groove are communicated and adapted to be filled with the material to be measured;

[0007] A sealing assembly, which is installed on the coating box and is adapted to compact and seal the enclosure cavity filled with the material to be measured and the receiving blind groove when the coating box is in the placement position; wherein, the coating box is adapted to be slid on the blade body to scrape off the material to be measured located outside the receiving blind groove after the enclosure cavity filled with the material to be measured and the receiving blind groove are sealed.

[0008] Furthermore, in order to scrape the material to be measured outside the receiving blind groove, a coating blade edge is provided on the coating box, which is adapted to be slid on the blade body to scrape off the material to be measured located outside the receiving blind groove after the enclosure cavity filled with the material to be measured and the receiving blind groove are sealed.

[0009] Furthermore, the lower surface of the coating box is adapted to fit with the upper surface of the blade body.

[0010] Furthermore, a lower opening communicating with the enclosure cavity is provided on the lower surface of the coating box, and a coating blade edge is provided on one side of the lower opening, which is adapted to be slid on the blade body to scrape off the material to be measured located outside the receiving blind groove after the enclosure cavity filled with the material to be measured and the receiving blind groove are sealed.

[0011] Furthermore, an upper opening communicating with the enclosure cavity is provided on the upper surface of the coating box, and the material to be measured is adapted to enter the enclosure cavity and the receiving blind groove from the upper opening when the coating box is in the placement position.

[0012] Furthermore, the sealing assembly is adapted to cooperate with the upper opening to seal the enclosure cavity filled with the material to be measured and the receiving blind groove when the coating box is in the placement position.

[0013] Furthermore, the sealing assembly includes an upper cover plate, and the upper cover plate covers the upper opening.

[0014] Furthermore, a pressure relief overflow hole is provided on the upper cover plate, and a sealing plug is provided on the pressure relief overflow hole.

[0015] Furthermore, a surrounding plate is provided on the periphery of the upper part of the coating box, and a stepped surface for cooperating with the upper cover plate is formed by the inner side surface of the surrounding plate and the upper surface of the coating box.

[0016] Furthermore, a guiding mechanism for cooperating with the blade body is provided at the lower part of the coating box to facilitate the sliding guidance of the coating box on the blade body.

[0017] Furthermore, in order to improve the measurement accuracy, the non-volatile matter accumulation volume fraction in different film thickness states can be measured, and the receiving blind groove is a single blind groove or at least two serially connected blind grooves with different depths.

[0018] The present invention also provides a method for measuring the stacking volume fraction of non-volatile matter in a material to be measured, which is implemented based on the above-mentioned device for measuring the stacking volume fraction of non-volatile matter. The steps of the method include:

[0019] Fit the coating box on the upper surface of the scraper body and place it in the placement position;

[0020] Pour the material to be measured to fill the surrounding cavity and the accommodating blind groove;

[0021] Compact and seal the surrounding cavity and the accommodating blind groove filled with the material to be measured through the sealing assembly;

[0022] Slide the coating box to scrape off the material to be measured outside the accommodating blind groove. The material to be measured remaining in the accommodating blind groove is the wet film; dry and cure the material to be measured remaining in the accommodating blind groove after scraping to form a dry film, and measure the thickness h of the middle part of the dry film;

[0023] Calculate the stacking volume fraction NV of the material to be measured through the following formula (1) and formula (2);

[0024] ρ = h / H (1)

[0025] NV = [h + 0.5ρ(H - h)] / H × 100% (2); where,

[0026] ρ is the shrinkage rate of the wet film in its length, width, and thickness directions, and the influence of the edge effect caused by the shrinkage of the wet film in the length direction is ignored;

[0027] H is the depth of the blind groove in the accommodating blind groove, that is, the depth of the wet film.

[0028] After adopting the above technical solution, the present invention sets a coating box and a surrounding cavity in the coating box. The surrounding cavity covers the accommodating blind groove, and before scraping, the volume of the accommodating blind groove and the surrounding cavity above it is locked and sealed through the sealing assembly. In this way, when scraping the material to be measured outside the upper surface of the scraper body through the coating box, since the volume of the surrounding cavity is locked, the volume in the accommodating blind groove is also locked, and the material to be measured in the accommodating blind groove will not move significantly. This avoids the phenomenon that directly scraping the material to be measured outside the accommodating blind groove affects the thickness of the wet film, and is particularly suitable for measuring materials to be measured with medium to high viscosity (greater than 200 Pa·s). Brief Description of the Drawings

[0029] Figure 1 is an exploded assembly view of the device for measuring the stacking volume fraction of non-volatile matter of the present invention;

[0030] Figure 2 is a schematic structural view of the scraper body with another structure of the present invention;

[0031] Figure 3This is a schematic cross-sectional view of the squeegee body of the present invention after the wet film dries and shrinks. Detailed implementation manners

[0032] To make the content of the present invention more clearly understood, the present invention will be further described in detail below according to specific embodiments in conjunction with the drawings.

[0033] Embodiment 1

[0034] As Figures 1 to 3 shown, a device for measuring the stacking volume fraction of non-volatile substances includes:

[0035] A squeegee body 1, on the upper surface of which there is a receiving blind groove 11;

[0036] A coating box 2, which is adapted to cooperate with the upper surface 12 of the squeegee body 1. There is an enclosing cavity 21 in the coating box 2. The coating box 2 has a placement position on the squeegee body 1. When the coating box 2 is in the placement position on the squeegee body 1, the enclosing cavity 21 and the receiving blind groove 11 are communicated and adapted to be filled with the material to be measured;

[0037] A sealing assembly, which is installed on the coating box 2 and is adapted to compact and seal the enclosing cavity 21 filled with the material to be measured and the receiving blind groove 11 when the coating box 2 is in the placement position; wherein,

[0038] The coating box 2 is adapted to be slid on the squeegee body 1 to scrape off the material to be measured outside the receiving blind groove 11 after the enclosing cavity 21 filled with the material to be measured and the receiving blind groove 11 are sealed.

[0039] In this embodiment, as Figure 1 shown, the receiving blind groove 11 is a blind groove, and the cross-section of the blind groove is a square structure with an open upper end.

[0040] Specifically, the lower surface of the coating box 2 is adapted to fit with the upper surface 12 of the squeegee body 1.

[0041] In this embodiment, as Figure 1 shown, the lower surface of the coating box 2 is provided with a lower opening communicating with the enclosing cavity 21, and on one side of the lower opening there is a coating blade 22 adapted to be slid on the squeegee body 1 to scrape off the material to be measured outside the receiving blind groove 11 after the enclosing cavity 21 filled with the material to be measured and the receiving blind groove 11 are sealed.

[0042] As Figure 1 shown, the upper surface of the coating box 2 is provided with an upper opening communicating with the enclosing cavity 21, and the material to be measured is adapted to enter the enclosing cavity 21 and the receiving blind groove 11 from the upper opening when the coating box 2 is in the placement position.

[0043] As Figure 1As shown, the sealing assembly is adapted to cooperate with the upper opening to seal the enclosure 21 filled with the material to be measured and the accommodating blind groove 11 when the coating box 2 is in the placement position.

[0044] As Figure 1 shown, the sealing assembly includes an upper cover plate 3, and the upper cover plate 3 covers the upper opening. The upper cover plate 3 is provided with two handles 7, and the periphery of the upper cover plate 3 is a cover plate step surface.

[0045] As Figure 1 shown, a pressure relief and overflow hole 31 is formed in the upper cover plate 3, and a sealing plug 4 is provided on the pressure relief and overflow hole 31.

[0046] As Figure 1 shown, a peripheral plate 5 is provided on the periphery of the upper part of the coating box 2, and a step surface that cooperates with the cover plate step surface of the upper cover plate 3 is formed by the inner side surface of the peripheral plate 5 and the upper surface of the coating box 2.

[0047] As Figure 1 shown, a guiding mechanism for cooperating with the squeegee body 1 to facilitate the sliding and guiding of the coating box 2 on the squeegee body 1 is provided at the lower part of the coating box 2; specifically, the guiding mechanism can be a guiding peripheral plate 6, and the guiding peripheral plate 6 cooperates with the side surface of the squeegee body 1 to conduct guiding when the coating box 2 slides.

[0048] Embodiment 2

[0049] In this embodiment, as Figure 2 shown, the accommodating blind groove 11 is at least two series-connected blind grooves with different depths, and the cross-section of the blind groove is a square structure. In this embodiment, the accumulated volume fractions of non-volatile substances in different film thickness states can be measured separately through multiple blind grooves at one time.

[0050] Embodiment 3

[0051] A method for measuring the accumulated volume fraction of non-volatile substances, which is implemented based on the non-volatile substance accumulated volume fraction measuring device in Embodiment 1 or Embodiment 2, and the steps of the method include:

[0052] The coating box 2 is fitted on the upper surface 12 of the squeegee body 1 and placed in the placement position, and the accommodating blind groove 11 is completely covered by the enclosure 21;

[0053] The material to be measured is poured to fill the enclosure 21 and the accommodating blind groove 11;

[0054] Compress and seal the enclosure cavity 21 filled with the material to be measured and the accommodating blind groove 11; specifically, place the upper cover plate 3 into the upper opening, press down the upper cover plate 3 to ensure that the periphery of the lower plane of the upper cover plate 3 is completely fitted with the step surface of the coating box 2, and there is obvious sample overflow from the pressure relief overflow hole 31. Let it stand for a moment until the pressure in the material to be measured in the coating box 2 is released to atmospheric pressure, and then tightly plug the pressure relief overflow hole 31 with the sealing plug 4 to lock the total volume of the material to be measured in the coating box 2 and the accommodating blind groove 11;

[0055] Slide the coating box 2 to scrape off the material to be measured outside the accommodating blind groove 11, and the remaining material to be measured in the accommodating blind groove 11 is the wet film; specifically: hold the end face of the scraping plate body 1 without the accommodating groove with the index finger or middle finger of the left hand, and use the thumb, index finger and middle finger of the right hand to press the middle parts of the two side plates 5 of the coating box 2 respectively and gently push and slide the coating box 2 quickly towards the end face without the accommodating groove on the scraping plate body 1 until the coating blade 22 on the coating box 2 completely passes over the accommodating blind groove 11. The total volume V of the material to be measured enclosed in the coating box 2 is precisely divided into two parts: the volume V1 remaining in the accommodating blind groove 11 and the volume V2 of the material to be measured remaining in the coating box 2, and V = V1 + V2;

[0056] Continue to push the coating box 2 in the same direction until the coating box 2 is completely separated from the scraping plate body 1. Clean the coating box 2 with a suitable solvent. After standing until the material to be measured in the accommodating blind groove 11 loses fluidity, dry and cure the remaining material to be measured in the accommodating blind groove 11 after scraping to form a dry film, and measure the thickness h of the middle part of the dry film;

[0057] Calculate the non-volatile matter accumulation volume fraction NV of the material to be measured through the following formula (1) and formula (2);

[0058] ρ = h / H (1)

[0059] NV = [h + 0.5ρ(H - h)] / H × 100% (2); where,

[0060] ρ is the shrinkage rate of the wet film in its length, width and thickness directions, and the influence of the edge effect caused by the shrinkage in the length direction of the wet film is ignored;

[0061] H is the depth of the blind groove in the accommodating blind groove 11, that is, the depth of the wet film.

[0062] In this embodiment, the specific derivation process of formula (1) and formula (2) can refer to the derivation process in a method for measuring the volume solid content of non-volatile matter of a coating disclosed in a Chinese patent with the publication number CN110824149B. Specifically, it can be as follows:

[0063] In this embodiment, the made wet film has a length of X, a width of L, and a thickness of H. The influence of the edge effect (or frame effect) caused by the shrinkage in the length direction is ignored.

[0064] Frame effect: The difference in film thickness between the edge and the middle part of the dry film after the paint film dries.

[0065] In this embodiment, the specific shape of the dry film after it is formed is as Figure 3 shown. The maximum unilateral shrinkage amount A in the width direction of the dry film coating = ρ×L / 2, and each point in the thickness direction of the wet film shrinks outward in the same proportion according to this shrinkage rate. On both sides of the dry film formed by the edge composite shrinkage, a right-angled triangular coating area B is formed on each side, and the height of the right-angled triangular coating area B > h;

[0066] From this, it can be known that the cross-sectional area S of the dry film = L×h+(H - h)×A;

[0067] The volume V of the dry film 干 = S×X = [L×h+(H - h)×A]×X = [L×h + 0.5ρ(H - h)L]×X = L×X×[h + 0.5ρ(H - h)];

[0068] The volume at the moment when the wet film is formed: V 温 = L×H×X;

[0069] Then the non-volatile matter accumulation volume fraction NV of the material to be measured is:

[0070] NV = V 干 / V 湿 ×100% = [h + 0.5ρ(H - h)] / H×100%.

[0071] In the above specific embodiments, the technical problems solved, technical solutions and beneficial effects of the present invention are further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An apparatus for measuring the stacking volume fraction of non-volatile substances, characterized in that, Comprising: A squeegee body (1), on the upper surface of which there is a receiving blind groove (11); A coating box (2), which is adapted to be fitted on the upper surface (12) of the squeegee body (1). There is an enclosing cavity (21) inside the coating box (2). The coating box (2) has a placement position on the squeegee body (1). When the coating box (2) is in the placement position on the squeegee body (1), the enclosing cavity (21) and the receiving blind groove (11) are in communication and are adapted to be filled with the material to be tested; A sealing assembly, which is installed on the coating box (2) and is adapted to compact and seal the enclosing cavity (21) and the receiving blind groove (11) filled with the material to be tested when the coating box (2) is in the placement position; wherein, The coating box (2) is adapted to be slid on the squeegee body (1) to scrape off the material to be tested outside the receiving blind groove (11) after the enclosing cavity (21) and the receiving blind groove (11) filled with the material to be tested are sealed; The upper surface of the coating box (2) is provided with an upper opening communicating with the enclosing cavity (21). The material to be tested is adapted to enter the enclosing cavity (21) and the receiving blind groove (11) from the upper opening when the coating box (2) is in the placement position; The sealing assembly is adapted to cooperate with the upper opening to seal the enclosing cavity (21) and the receiving blind groove (11) filled with the material to be tested when the coating box (2) is in the placement position. The sealing assembly includes an upper cover plate (3), and the upper cover plate (3) covers the upper opening; A pressure relief and overflow hole (31) is formed in the upper cover plate (3), and a sealing plug (4) is provided on the pressure relief and overflow hole (31).

2. The non-volatile matter bulk volume fraction measuring device according to claim 1, characterized in that The coating box (2) is provided with a coating blade edge (22) adapted to be slid on the squeegee body (1) to scrape off the material to be tested outside the receiving blind groove (11) after the enclosing cavity (21) and the receiving blind groove (11) filled with the material to be tested are sealed.

3. The non-volatile matter bulk volume fraction measuring device according to claim 1, characterized in that The lower surface of the coating box (2) is adapted to be in contact with the upper surface (12) of the squeegee body (1).

4. The non-volatile matter bulk volume fraction measuring device according to claim 3, characterized in that The lower surface of the coating box (2) is provided with a lower opening communicating with the enclosing cavity (21). On one side of the lower opening, there is a coating blade edge (22) adapted to be slid on the squeegee body (1) to scrape off the material to be tested outside the receiving blind groove (11) after the enclosing cavity (21) and the receiving blind groove (11) filled with the material to be tested are sealed.

5. The non-volatile matter bulk volume fraction measuring device according to claim 1, characterized in that A peripheral plate (5) is provided around the upper part of the coating box (2). The inner side surface of the peripheral plate (5) and the upper surface of the coating box (2) form a step surface for cooperating with the upper cover plate.

6. The non-volatile matter accumulation volume fraction measuring device according to claim 1, characterized in that a guiding mechanism for cooperating with the blade body (1) is provided at the lower part of the coating box (2) to facilitate the sliding and guiding of the coating box (2) on the blade body (1).

7. The non-volatile matter accumulation volume fraction measuring device according to claim 1, characterized in that the accommodation blind groove (11) is one blind groove or at least two series-connected blind grooves with different depths.

8. A method for measuring the stacking volume fraction of non-volatile substances, characterized in that, Based on the implementation of the non-volatile matter accumulation volume fraction measuring device according to any one of claims 1 to 7, the steps of the method include: matching the coating box (2) on the upper surface (12) of the blade body (1) and placing it in the placement position; filling the surrounding cavity (21) and the accommodation blind groove (11) with the material to be measured; compacting and sealing the surrounding cavity (21) and the accommodation blind groove (11) filled with the material to be measured through the sealing assembly; sliding the coating box (2) to scrape off the material to be measured outside the accommodation blind groove (11), and the material to be measured remaining in the accommodation blind groove (11) is the wet film; drying and curing the material to be measured remaining in the accommodation blind groove (11) after scraping to form a dry film, and measuring the thickness h of the middle part of the dry film; calculating the non-volatile matter accumulation volume fraction NV of the material to be measured through the following formula (1) and formula (2); ρ = h / H (1) NV = [h + 0.5ρ(H - h)] / H × 100% (2); where ρ is the shrinkage rate of the wet film in its length, width, and thickness directions, and the influence of the edge effect caused by the shrinkage of the wet film in the length direction is ignored; H is the depth of the blind groove in the accommodation blind groove (11), that is, the depth of the wet film.

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