Testing method for evaluating dissolving power of cleaning solvent and diluent

Abstract

The invention relates to a test method for evaluating the dissolving power of a cleaning solvent and a diluent, which comprises the following steps of: 1, selecting a base material plate, smearing paint to be cleaned onto the base material plate through a winding bar to form a uniform paint film with a fixed thickness, and naturally airing for a certain time according to an actual use state to form a test sample plate; step 2, adding a cleaning solvent or diluent to be tested into the burette, and testing the outflow effect of the cleaning solvent or diluent dripped out of the burette ball valve; 3, the paint film of the test sample plate faces upwards and is obliquely placed, so that an included angle of 20-30 degrees is formed between the test sample plate and the horizontal plane; the burette is vertically placed above the sample plate to be tested; step 4, extruding a ball valve of the burette to enable the cleaning solvent or diluent in the burette to drop on the base material plate coated with the paint film, and recording the number of titration drops when the color of the base material of the base material plate is exposed; the method can quickly and efficiently analyze whether the solvent product has applicability to the to-be-cleaned material.

Description

Technical Field

[0001] The invention belongs to the field of coating lines and relates to a cleaning solvent product test, in particular to a testing method for evaluating the dissolving power of a cleaning solvent and a diluent. Background Art

[0002] When testing and testing the existing cleaning solvent products of the coating line, at least 200kg of the cleaning solvent system needs to be invested. The test volume is huge, time-consuming and labor-intensive, and there is a possibility that the test fails as expected, resulting in the system being re-discharged and the waste of materials. At present, the main reasons why cleaning solvents or diluents cannot be quantitatively evaluated are: it is impossible to quantify the solubility and dilution of solvent products for the materials to be cleaned or diluted; the evaluation of the coating workshop can only be based on the verification of the cleaning effect after the solvent materials are put into the system and the parts are sprayed in normal production, which takes a long time and consumes more production resources. These reasons are likely to cause unsuitable cleaning solvents or diluents to be used as supporting products in the daily production of the coating workshop. The consequences include that the paint mist adsorbed by the spraying equipment cannot be rinsed clean, and more paint particles are generated when it is used again; at the same time, the blind end of the front-end spray atomizer system accumulates a lot of unwashed residual paint due to the efficiency problem of the cleaning solvent, and after a long time, it forms pipeline pollutants that are difficult to remove, which has a negative impact on the subsequent color, appearance and accuracy of the spray flow. Summary of the invention

[0003] In view of the above-mentioned technical problems and defects, the object of the present invention is to provide a test method for evaluating the solubility of cleaning solvents and diluents. This method records the number of drops dropped when the color of the base material of the substrate is exposed on the sample with a coating film, so as to evaluate the solvent power or dilution capacity of the solvent-based cleaning solvent / aqueous cleaning solvent or dilution solvent used in the paint shop, and quickly and efficiently analyze whether the solvent product is suitable for the material to be cleaned.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A test method for evaluating the solvency of cleaning solvents and diluents, the method comprising the following steps:

[0006] Step 1. Select a substrate board, apply the paint to be cleaned to the substrate board by scraping through a wire rod to form a uniform paint film with a fixed thickness, and then dry it naturally for a certain period of time according to the actual use status according to the on-site spraying construction conditions to form a test sample;

[0007] Step 2. Add the cleaning solvent or diluent to be tested into the burette, and test the outflow effect of the cleaning solvent or diluent dripping out of the burette ball valve;

[0008] Step 3. Place the test sample with the paint film facing upward and tilted so that the test sample forms an angle of 20 to 30 degrees with the horizontal plane; and place the burette vertically above the test sample;

[0009] Step 4. Squeeze the ball valve of the burette to drip the cleaning solvent or diluent in the burette onto the substrate plate coated with the paint film, and record the number of drops until the base color of the substrate plate is exposed;

[0010] Step 5. Replace the cleaning solvent or diluent to be compared and repeat the above operation; when repeating the above operation, it is necessary to ensure that the titration speed of the burette is consistent, the angle between the test sample and the horizontal plane is consistent, and the positional relationship between the burette and the test sample is consistent;

[0011] Step 6. Record the number of drops of different types of cleaning solvents or diluents until the color of the base material is exposed, compare the cleaning effects or dilution effects of different types of cleaning solvents or diluents based on the number of drops, and find out the type of cleaning solvent or diluent with suitable dissolving power.

[0012] As a preferred embodiment of the present invention, the substrate plate used in step 1 is a tinplate plate or a transparent glass plate or a sample plate with a smooth surface.

[0013] As a preferred embodiment of the present invention, the test sample in step 3 is arranged in a test box, a test inclined block with a fixed angle is arranged in the test box, and the bottom surface of the test sample is arranged on the inclined surface of the test inclined block.

[0014] Advantages and beneficial effects of the present invention:

[0015] (1) The test method provided by the present invention uses a titration method to simulate the cleaning solvent or diluent to titrate and dilute the paint coating reused in the paint shop, simulating the gravity flushing effect under a non-pressurized state in the on-site pipeline. By recording the number of titration drops, this method can evaluate the solubility or dilution capacity of the solvent-based cleaning solvent / aqueous cleaning solvent or dilution solvent used in the paint shop, and quickly and efficiently analyze whether the solvent product is suitable for the material to be cleaned.

[0016] (2) The testing method of the present invention can provide the cleaning or dissolving ability of different solvent products for the paint to be cleaned / diluted based on the comparison results. This method can screen out suitable cleaning solvent products or diluent products in parallel, thereby improving the quality stability of the cleaning solvent products or diluent products.

[0017] (3) The test method provided by the present invention has a short test evaluation time, can quickly screen out suitable products and compare the solubility of different products, can quantify the solubility of the products, and judge the solubility according to the number of titration drops (based on the color of the substrate leaked after titration). This method can be used as a monitoring method for factory inspection or flight inspection, and can pre-determine the solubility status of the product to be used, ensure the solubility stability of the cleaning solvent product or the diluent product, and avoid quality defects during on-site spraying production due to fluctuations in the stability of the product batches produced by the supplier.

[0018] (4) The use of the test method of the present invention can greatly reduce the time for comparative testing of solvent solubility, avoid the test waste caused by investing too much in the cleaning solvent system, and facilitate engineers or technicians to compare different cleaning solvent brands in parallel and select suitable products to solve the problem of inadequate cleaning of paint materials during on-site construction, resulting in particles, paint spots or other surface defects on the surface of sprayed parts. In addition, it provides clear and definite evidence for determining the batch fluctuations in the cleaning ability of varnish solvent products, which is conducive to the subsequent rapid rectification of the responsible party to solve the cleaning ability problem, ensure the stable supply of mass-produced products, and reduce the probability of defects on the surface of sprayed parts.

[0019] (5) After using the test method of the present invention, a parallel comparison of the solubility of newly introduced cleaning solvents or diluent products can be made, and a comparative result that can be quantified and analyzed can be quickly obtained, which provides a feasible and effective method for solving the problems of spray surface particles caused by poor cleaning ability, solvent point defects and other appearance defects caused by low solubility of cleaning solvents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the dissolving power test process of the present invention; DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution and advantages of the present invention, the present application is described in detail below in conjunction with the accompanying drawings, but it is not intended to limit the protection scope of the present invention.

[0022] like Figure 1 As shown, this embodiment provides a test method for evaluating the dissolving power of a cleaning solvent and a diluent, the method comprising the following steps:

[0023] Step 1. Select a substrate plate, apply the paint to be cleaned to the substrate plate by a wire rod and scraping to form a uniform paint film with a fixed thickness, and then dry it naturally for a certain time according to the actual use state according to the on-site spraying construction conditions to form a test sample 1; wherein the substrate plate used is a tinplate plate or a transparent glass plate or a sample with a flat surface;

[0024] Step 2. Add the cleaning solvent or diluent to be tested into the acid-base burette 2, and test the outflow effect of the cleaning solvent or diluent dripping out of the ball valve of the acid-base burette 2;

[0025] Step 3. Place the test sample 1 with the paint film facing upward and tilted so that the test sample 1 forms an angle of 20 to 30 degrees with the horizontal plane; and place the acid-base burette 2 vertically above the test sample 1;

[0026] Step 4. squeeze the ball valve of the acid-base burette 2 to drip the cleaning solvent or diluent in the acid-base burette 2 onto the substrate plate coated with the paint film, and record the number of drops until the color of the base material of the substrate plate is exposed;

[0027] Step 5. Replace the cleaning solvent or diluent to be compared and repeat the above operation; when repeating the above operation, it is necessary to ensure that the titration speed of the acid-base burette 2 is consistent, the angle between the test sample 1 and the horizontal plane is consistent, and the positional relationship between the acid-base burette 2 and the test sample 1 is consistent during each operation;

[0028] Step 6. Record the number of drops of different types of cleaning solvents or diluents until the color of the base material is exposed, compare the cleaning effects or dilution effects of different types of cleaning solvents or diluents based on the number of drops, and find out the type of cleaning solvent or diluent with suitable dissolving power.

[0029] Furthermore, in this embodiment, the test sample 1 in step 3 is arranged in a test box 3 , a test inclined block 4 with a fixed angle is arranged in the test box 3 , and the bottom surface of the test sample 1 is arranged on the inclined surface of the test inclined block 4 .

[0030] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art of the present invention, according to the idea of ​​the present invention, some simple deductions, deformations or substitutions can be made. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A test method for evaluating the solubility of cleaning solvents and diluents, characterized in that: The method comprises the following steps: Step 1. Select a substrate board, apply the paint to be cleaned to the substrate board by scraping through a wire rod to form a uniform paint film with a fixed thickness, and then dry it naturally for a certain period of time according to the actual use status according to the on-site spraying construction conditions to form a test sample; Step 2. Add the cleaning solvent or diluent to be tested into the burette, and test the outflow effect of the cleaning solvent or diluent dripping out of the burette ball valve; Step 3. Place the test sample with the paint film facing upward and tilted so that the test sample forms an angle of 20 to 30 degrees with the horizontal plane; and place the burette vertically above the test sample; Step 4. Squeeze the ball valve of the burette to drip the cleaning solvent or diluent in the burette onto the substrate plate coated with the paint film, and record the number of drops until the base color of the substrate plate is exposed; Step 5. Replace the cleaning solvent or diluent to be compared and repeat the above operation; when repeating the above operation, it is necessary to ensure that the titration speed of the burette is consistent, the angle between the test sample and the horizontal plane is consistent, and the positional relationship between the burette and the test sample is consistent; Step 6. Record the number of drops of different types of cleaning solvents or diluents until the color of the base material is exposed, compare the cleaning effects or dilution effects of different types of cleaning solvents or diluents based on the number of drops, and find out the type of cleaning solvent or diluent with suitable dissolving power.

2. A testing method for evaluating the dissolving power of cleaning solvents and diluents according to claim 1, characterized in that: The substrate plate used in step 1 is a tinplate plate or a transparent glass plate or a sample plate with a flat surface.

3. A testing method for evaluating the dissolving power of cleaning solvents and diluents according to claim 1, characterized in that: In step 3, the test sample is arranged in a test box, a test inclined block with a fixed angle is arranged in the test box, and the bottom surface of the test sample is arranged on the inclined surface of the test inclined block.

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