CN109540914B - Paint film tolerance test indicator and preparation method and application thereof - Google Patents
Paint film tolerance test indicator and preparation method and application thereof Download PDFInfo
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- CN109540914B CN109540914B CN201811475632.8A CN201811475632A CN109540914B CN 109540914 B CN109540914 B CN 109540914B CN 201811475632 A CN201811475632 A CN 201811475632A CN 109540914 B CN109540914 B CN 109540914B
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Abstract
The invention discloses a paint film resistance test indicator, and a preparation method and application thereof. The paint film resistance test indicator comprises, by weight, 73.2-82.3 parts of deionized water, 0.6-1.5 parts of buffering agent, 0.05-0.25 part of defoaming agent, 4.0-10.0 parts of anionic surfactant, 8.0-10.0 parts of nonionic surfactant, 2.5-4.0 parts of cosolvent, 0.5-2.0 parts of fluorescent whitening agent, 0.025 parts of preservative and 0.025 parts of mildew preventive. The invention makes the judgment grading in the paint film resistance test more standard and objective, amplifies the change of the tested paint film with only slight trace, and solves the problems that the test liquid trace existing on the paint film surface is not obvious and is not easy to grade and evaluate by direct visual observation of a detection specialist after the resistance test, and the sensitivity of the test trace is different and a consistent conclusion is not easy to obtain.
Description
Technical Field
The invention relates to a paint film resistance test indicator, in particular to a paint film resistance test indicator, a preparation method and an application thereof, and belongs to the technical field of coatings.
Background
The paint film is a solid continuous film formed by coating one or more coatings on an object, and mainly has the functions of protection and decoration, such as a water-based bi-component polyurethane paint film on the surface of an office table. Since workpieces are in contact with some liquid in daily use, in order to ensure that the paint film does not change significantly after the workpieces are in contact with the liquid in daily life for a certain period of time, the requirement for the resistance of the paint film to the specific liquid is raised. Resistance tests for paint films often include water resistance, alcohol resistance, coffee resistance, vinegar resistance, alkali resistance, and the like.
When a coating is selected, a tolerance requirement for the coating is necessarily required by any enterprises using the coating, such as furniture enterprises, toy enterprises or automobile enterprises, and when a coating is developed, target parameters of the coating in the tolerance aspect are necessarily required to be set by the coating enterprises. Therefore, a set of standardized method can improve the communication efficiency of production activities and can also define the target of research and development work. Therefore, the standard test method and the grading evaluation standard of the paint film resistance become important assistance for promoting Chinese paint enterprises to catch up with international paint huge heads.
The requirements for the resistance of different workpieces at home and abroad are different, for example, GB/T23999-2009 waterborne wood coatings for interior decoration and the requirement for the resistance of a pleasant surface, and the corresponding test methods are GB/T4893.1-2005 Furniture surface cold liquid resistance measurement method and BS EN 12720:2009 Furniture-Assessment of surface resistance to cold liquids.
The surface resistance requirement of the water-based wood coating for indoor decoration and finishing of GB/T23999-2009 is shown in Table 1:
TABLE 1 GB/T23999-2009 surface resistance requirement table for waterborne wood coatings for interior decoration
Remarking: the normal temperature water resistance is carried out according to the GB/T4893.1-2005 regulations, the test solution is distilled water, the middle part of each plate is taken in the test solution area, 5 layers of paper sheets are respectively placed on each test solution area, the filter paper is kept wet in the test process, and vaseline is coated on the contact part of the glass cover and the test plate for sealing when necessary. And removing the filter paper after 24h, sucking the filter paper, standing the filter paper for 2h, and observing the filter paper under scattered sunlight visually, wherein if 2 test plates in the 3 test plates have no coating ill-conditions such as air bubbles, cracks, peeling and the like, but slight gloss change is allowed to appear, the test plates are judged to be 'abnormal-free'. The occurrence of the above film-coating ill-condition phenomenon is described in GB/T1766.
The boiling water resistance is measured and evaluated according to the normal temperature water resistance test, the test solution is boiling water, the test process is allowed to cool naturally, the test time is 15min, and the test is observed after being placed for 15 min.
The method for testing alkali resistance and evaluating results is the same as normal temperature water resistance, and the test solution is NaHCO of 50g/L3The test time is 1h, and the test is observed after the test is placed for 1 h.
The method for testing alcohol resistance and evaluating results is the same as the method for water resistance at normal temperature, the test solution is 50 percent (volume fraction) ethanol solution, the test time is 1h, and the test is observed after the test is placed for 1 h.
The method for testing and evaluating the results of the pollution resistance is the same as the normal-temperature water resistance, the testing time is 1h, and the observation is carried out after the test is carried out for 1 h.
The vinegar-resistant test solution is brewed vinegar.
The tea-resistant test solution is green tea water, 250mL of boiling water is added into 2g of green tea, and the test is carried out by using the tea water immediately after the green tea is placed for 5min at room temperature.
Test solutions for testing the GB/T4893.1-2005 furniture surface cold-resistant liquid are shown in the following table 2:
TABLE 2 GB/T4893.1-2005 Table for testing the cold-resistant liquid on furniture surface
Remarking: preparation of standard dish washing detergent in GB 9985-2000: weighing 14 parts (by 100%) of sodium alkyl benzene sulfonate, 1 part (by 100%) of ethoxylated alkyl sodium sulfate, 5 parts of absolute ethyl alcohol and 5 parts of urea, adding water to 100 parts, uniformly mixing, and adjusting the pH value to 7-8 with hydrochloric acid or sodium hydroxide for later use.
The test procedure for measuring the cold-resistant liquid on the surface of the GB/T4893.1-2005 furniture is as follows:
immediately after the preparation treatment, the test piece was placed in an environment at a temperature of (23. + -. 2 ℃ C.) to conduct the test.
The test surface should be placed horizontally and the selected test solution applied to the test sites with the centers of the two sites spaced no less than 60mm apart. The center of the test site should be no less than 40mm from the edge of the test surface, if possible. Two identical tests should be run simultaneously if it is reasonable to assume that the test surface properties may change.
The type, amount and test time of the test solution are clarified in the specification, or agreed according to the supplier and the supplier or the related parties.
Placing the round paper sheet into the selected appropriate test solution, soaking for 30s, clamping with tweezers, wiping off the flowing liquid along the edge of a container containing the test solution, quickly placing on a test area, immediately covering with an inverted toughened glass cover, wherein the round paper sheet should not contact the glass cover. The position of each applied test solution is recorded.
After the specified test time was reached, the glass cover was removed and the round piece of paper was removed with tweezers without tearing off the piece of paper adhering to the test area. And (3) sucking the residual liquid (without wiping) by using absorbent paper, exposing the test surface in the test environment and standing for 16-24 h, wherein the test area needs to take enough protection measures to prevent air dust from invading.
After 16-24 h, the test surface is lightly scrubbed by dipping specified cleaning liquid with a water-absorbing cloth, then the test surface is scrubbed by absorbing water with the cloth, and finally the test surface is carefully scrubbed with a dry cloth.
At the same time, one location (the control area) on the test surface where no test solution was applied was scrubbed and wiped off.
The test surface was left to stand for 30min in the test environment.
Test piece inspection of cold liquid resistance measurement of GB/T4893.1-2005 furniture surface:
the test area was carefully examined for damage such as discoloration, tarnishing, blistering and other defects. Either diffuse or direct light sources are used for this purpose, illuminating the test surface alone and reflecting it into the eye of the observer, and inspecting it from different angles, including the inter-angular regions. The observation distance is 0.25 m-1.0 m.
The test area and the peripheral untested area were compared at each position with light parallel or perpendicular to the test surface texture direction (if any).
If allowed, the examination is again performed after a longer test time.
And evaluating the results of GB/T4893.1-2005 furniture surface cold-resistant liquid measurement.
The test areas were ranked by comparison with the control areas, the ranking criteria are shown in table 3:
table 3 grading evaluation chart
Remarking: it is recommended that the evaluation of the results for each test area be undertaken by more than one person with experience in this type of evaluation. The rating of the test area should be taken to be the same maximum or the maximum of the number of observers. For example: the grades rated by each inspector were: 1. 2, 3, the rank of the test area is: 3; the grades rated by each inspector were: 5. 4, 3, the rank of the test area is: 4.
the assessment of the results obtained with which light source (diffuse, direct) should be recorded.
The two test areas should be assessed and reported separately.
The acclimation surface resistance requirements are as in table 4:
TABLE 4 table of surface resistance requirements at home
No difference exists between the GB/T4893.1-2005 and the BS EN 12720:2009 in test methods, but due to cultural differences, the order of grading assessment in the two standards is reversed, with no visibility change in GB/T4893.1-2005 and no visibility change in BS EN 12720:2009 in grade 1.
When the skilled person performs the tolerance test according to the above method, when the trace of the test solution after wiping off the test solution is not obvious, the judgment classification is difficult to be accurately performed by direct human eye observation, namely, the judgment is difficult to be performed among the grades 1, 2 and 3 (the grades 3, 4 and 5 in the BS EN 12720: 2009) in GB/T4893.1-2005. When a plurality of testers carry out testing, different conditions are easily judged by different testers due to different sensitivity degrees of each tester to the testing impression.
Currently, there is no more accurate or standard method in this field, which is very likely to cause the communication between the inspection institution and the inspection enterprise to be poor. And when a high-resistance coating product is developed by adopting a comparison experiment, the quality of the high-resistance coating product and the high-resistance coating product can not be accurately judged by the conventional observation method, and the comparison experiment has no comparison effect and is not beneficial to the research and development of the high-resistance coating product. Therefore, there is an urgent need for an indicator that makes the slight traces of a paint film after resistance testing more noticeable, and thus helps the tester to judge the rating.
Disclosure of Invention
The invention aims to solve the problem that after a resistance test, a detection specialist directly observes the test solution trace existing on the surface of a paint film by naked eyes and is not obvious and difficult to evaluate in a grading way, and provides a paint film resistance test indicator and a preparation method thereof, so that whether the test solution trace exists in the paint film after the resistance test and the obvious degree of the trace are easier to judge, and a test method completely depending on experience and subjectivity is more standard and objective.
The invention also aims to provide an application method of the paint film resistance test indicator.
The invention makes use of the adsorption principle. After the resistance test, there may be non-visible changes in the test area of the paint film, i.e., test marks, such as slight swelling and surface damage, which may increase the surface roughness of the paint film, and when the surface of the paint film after the test is wiped with a paper towel dipping the paint film resistance test indicator, the indicator is more easily adsorbed in the area where there is a change after the test, and thus the area where there is a change after the wiping will adsorb more indicator than the area where there is no change.
The indicator formulation for resistance testing of paint films according to the invention contains a fluorescent whitening agent, since the areas with variations after wiping adsorb more indicator than the areas without variations, the fluorescence observed for the areas with variations will be stronger than the areas without variations, the phenomenon observed with the naked eye being that the areas with variations will be brighter or darker than the surrounding areas without variations. After the indicator disclosed by the invention is used for wiping, a non-visible test impression is obvious, an originally visible test impression is more obvious, and a consistent conclusion can be obtained more easily when multiple detection specialists carry out paint film resistance tests. The invention solves the problem that when a plurality of inspectors carry out paint film resistance test, each test specialist has different sensitivity degrees to test marks, so that consistent conclusion is difficult to obtain.
The purpose of the invention is realized by the following technical scheme:
the paint film resistance test indicator comprises the following raw materials in parts by weight: 73.2-82.3 parts of deionized water, 0.6-1.5 parts of buffering agent, 0.05-0.25 part of defoaming agent, 4.0-10.0 parts of anionic surfactant, 8.0-10.0 parts of nonionic surfactant, 2.5-4.0 parts of cosolvent, 0.5-2.0 parts of fluorescent whitening agent, 0.025 part of preservative and 0.025 part of mildew preventive;
the anionic surfactant is sodium dodecyl benzene sulfonate, sodium dodecyl sulfate or AS-801 of Dow chemical;
the nonionic surfactant is one of EH-9 of Dow chemical, AEO-7 of Pasteur and CO-630 of Solvay;
the fluorescent whitening agent is one of JADEWIN CBS-X of Jidaojia new material science and technology Limited in Qingdao, 33 of fluorescent whitening agent in Shandong Yousio chemical industry and JD-3 of Jining Huaka corporation.
To further achieve the object of the present invention, preferably, the buffer is one of sodium carbonate, sodium bicarbonate and sodium dihydrogen phosphate.
Preferably, the defoamer is TEGO-902W, TEGO-904W from winning companies, BYK-028 from Bick companies.
Preferably, the cosolvent is one of glycerol, sorbitol and polyethylene glycol PEG-200.
Preferably, the preservative is Bioban586 from dow chemical.
Preferably, the mildew preventive is Skane M8 of dow chemical.
The preparation method of the paint film resistance test indicator comprises the following steps: mixing deionized water, a buffering agent, a defoaming agent, an anionic surfactant, a nonionic surfactant, a cosolvent, a fluorescent brightener, a preservative and a mildew preventive, uniformly stirring, filtering and discharging to obtain the paint film resistance test indicator.
Preferably, the stirring is carried out at a medium speed for 15-30min at the temperature of 60-70 ℃, and the filtering is carried out by 300-mesh filter cloth.
Application of the indicator for paint film resistance test: dipping a paper towel or cotton cloth into the paint film resistance test indicator, squeezing the paper towel or cotton cloth to remove the redundant indicator, wiping the test area with the paper towel or cotton cloth dipped with the paint film resistance test indicator in a one-way gradual mode, observing whether a test trace exists in the test area on the surface of the paint film in the volatilization process after the indicator is wiped, and judging the resistance grade by contrasting a grading evaluation table in GB/T4893.1-2005.
Compared with the prior art, the invention has the following advantages:
the invention solves the problem that after the resistance test, a detection specialist directly observes the test solution trace on the surface of the paint film by naked eyes and is not easy to evaluate in grades, and solves the problem that when a plurality of detection specialists carry out the paint film resistance test, each detection specialist has different sensitivity degrees to the test trace and is not easy to obtain a consistent conclusion. The invention makes the judgment grading in the paint film resistance test more standard and objective and amplifies the change when the paint film has only slight traces after the test. The invention facilitates the comparative experiment in the development of high-resistance paint, thereby promoting the development of the paint industry.
Drawings
FIG. 1 is a photograph of the two-component waterborne polyurethane topcoat H2M0125 maintained after dropping water and before wiping water in the water resistance test of example 1.
FIG. 2 is a schematic representation of a comparative situation of the two-component waterborne polyurethane topcoat H2M0125 of example 1 after water removal by the Water resistance test, without any treatment, and after wiping with an indicator.
FIG. 3 is a photograph of the waterborne UV topcoat H4M0125 maintained after dropping water and before wiping water in the water resistance test of example 2.
FIG. 4 is a schematic representation of the comparative condition of the waterborne UV topcoat H4M0125 of example 2 after wiping out the test solution without any treatment and after wiping with an indicator.
FIG. 5 is a photograph of the waterborne UV topcoat H4M0127 maintained after dropping water and before wiping water in the water resistance test of example 3.
FIG. 6 is a schematic representation of the comparative condition of the waterborne UV topcoat H4M0127 of example 3 after wiping out the test solution without any treatment and after wiping with an indicator.
Detailed Description
The present invention will be further described with reference to specific examples, but the embodiments of the present invention are not limited thereto, and may be carried out with reference to conventional techniques for process parameters not particularly noted.
Example 1
The formulation of one of the paint film resistance test indicators is shown in table 5.
TABLE 5 paint film resistance test indicator formulation
A preparation method of a paint film resistance test indicator comprises the following steps: according to the weight parts, 82.3 parts of deionized water, 0.6 part of sodium carbonate, 0.05 part of TEGO-902W, 5.0 parts of sodium dodecyl benzene sulfonate, 8.0 parts of EH-9, 3.0 parts of glycerol, 1.0 part of CBS-X, 0.025 part of Bioban586 and 0.025 part of Skane M8 are sequentially added, stirred at a medium speed of 70 ℃ for 15min, filtered by 300-mesh filter cloth and discharged, and the indicator for the paint film resistance test is obtained.
A double-component waterborne polyurethane finish H2M0125 from Jia Bao Li chemical group Limited company is selected to be used for preparing a film on a black base plate, and a water resistance test is carried out according to GB/T4893.1-2005. Selecting two areas 1A and 1B of the surface of a double-component waterborne polyurethane finish H2M0125 paint film, and dripping a certain amount of test water into the areas 1A and 1B simultaneously, wherein the figure 1 is a photograph schematic diagram of the state maintained after dripping water from the areas 1A and 1B in the water resistance test until the water is wiped off.
After the test solution on the surface of the double-component waterborne polyurethane finish paint film H2M0125 is wiped off for 24 hours, the area 1A is wiped by an indicator, the area 1B is not treated, and the photographing schematic diagram of the comparison result is shown in FIG. 2 (in the actual detection process, an inspector directly observes the surface of the paint film, but not observes a picture, and the diagram is only schematic).
After the test solution on the surface of the paint film of the double-component waterborne polyurethane finish paint H2M0125 is wiped off for 24 hours, the area 1B is not treated, and the surface of the paint film is directly observed by naked eyes. The area 1B in FIG. 2 failed to show traces of the water resistance test due to photographing, but traces were observed by direct visual observation of the paint film surface by 5 inspection specialists. Among the 5 panelists, 3 looked at a discontinuous slight impression from one direction and 2 looked at a nearly complete circle from each direction. And 5 detection specialists respectively judge the water resistance of the water-resistant rubber into 2 grades, 3 grades and 3 grades according to a grading evaluation table in GB/T4893.1-2005. And (5) integrating the judgment results of 5 detection specialists, and judging the water resistance of the H2M0125 to be 2 grade.
After wiping off the test solution for 24 hours, the 1A site was wiped with an indicator while visually observing the paint film surface. Dipping a paper towel or cotton cloth into the indicator for testing the resistance of the paint film, extruding the paper towel or the cotton cloth to remove the redundant indicator, one-way gradually wiping the water resistance test area of the double-component waterborne polyurethane finish H2M0125 by the wet paper towel or cotton cloth, namely covering the whole area covered by the toughened glass cover with the outer edge extending outwards by 2cm, and observing the test area in the process of indicator volatilization after wiping and wiping. The wet trace seen in the area 1A of fig. 2 is the trace of the indicator wiping, and a darker and completely circular area is seen in the middle of the trace, which is the water resistance test trace. Almost complete round marks can be seen by 5 detection specialists from all directions through direct visual observation of the surface of the paint film, such as the round marks in the area 1A in the graph 2, and the water resistance of the H2M0125 is judged to be 3 grades by contrasting with a grading evaluation table in GB/T4893.1-2005.
The paint film in this example was subjected to a resistance test and then directly observed to have a resistance rating of 2, while the paint film after wiping with the indicator of this example was observed to have a resistance rating of 3. Such differences are caused by the presence of non-visible changes in the test area of the paint film, such as slight swelling and surface damage, which increase the surface roughness of the paint film and thus the indicator is more readily adsorbed in the changed position after the test. When the test area is wiped with the indicator, the indicator is adsorbed more at the position where there is a change than at the position where there is no change, and the fluorescence is stronger at the position where there is a change than at the position where there is no change because the indicator contains a fluorescent substance. Thus, non-visible changes will be apparent, and originally visible changes will be more apparent, after wiping with the indicator of the present invention.
The paint film resistance test indicator in the embodiment functions like a magnifying glass for observing the change of the paint film after the resistance test, and is beneficial to the judgment and classification of the paint film resistance test and the development of a contrast experiment in the research and development of high-resistance paint, so that the development of the paint industry is promoted.
Example 2
The formulation of one of the paint film resistance test indicators is shown in table 6.
TABLE 6 paint film resistance test indicator formulation
Method for preparing indicator for paint film resistance test: 81 parts of deionized water, 1.0 part of sodium bicarbonate, 0.05 part of TEGO-904W, 4.0 parts of sodium dodecyl sulfate, 10.0 parts of AEO-7, 2.5 parts of sorbitol, 1.4 parts of fluorescent whitening agent 33, 0.025 part of Bioban586 and 0.025 part of Skane M8 are sequentially added in parts by weight, stirred at a medium speed for 25min at a temperature of 65 ℃, filtered through 300-mesh filter cloth and discharged, and the indicator for the paint film resistance test is obtained.
A water-based UV finish H4M0125 from Jia Bao Li chemical group Limited company is selected to be used for preparing a film on a black base plate, and a water resistance test is carried out according to GB/T4893.1-2005. Selecting two areas 2A and 2B of the surface of a water-based UV finish paint H4M0125 paint film, and dripping a certain amount of test water into the areas 2A and 2B simultaneously, wherein a picture 3 is a photograph schematic diagram of a state maintained after water drops from the areas 2A and 2B in the water resistance test until the water is wiped off.
After the test solution on the surface of the paint film of the double-component waterborne polyurethane finish paint H4M0125 is wiped off for 24 hours, the area 2B is wiped by an indicator, the area 2A is not treated at all, and the photographing schematic diagram of the comparison result is shown in FIG. 4 (the actual detection process is that an inspector directly observes the surface of the paint film, and the diagram is not an observation picture, but only schematic).
After wiping off the test solution for 24h, the 2A area is directly observed on the paint film surface by naked eyes without any treatment. The area 2A in FIG. 4 failed to show the trace of the water resistance test due to photographing, but some trace was observed by the 5 inspection specialists directly observing the surface of the paint film with naked eyes. No visual change of the paint film surface is seen from all directions in 4 of 5 detection specialists, and discontinuous slight mark is seen from the paint film surface from a certain direction in 1. And 5 detection specialists respectively judge the water resistance of the water-resistant rubber into 1 grade, 1 grade and 2 grade according to the grading evaluation table in GB/T4893.1-2005. And (5) integrating the judgment results of 5 detection specialists, and judging the water resistance of the H4M0125 to be level 1.
After wiping off the test solution for 24 hours, the 2B site was wiped with an indicator while visually observing the paint film surface. Dipping a paper towel or cotton cloth into the indicator for testing the resistance of the paint film, extruding the paper towel or the cotton cloth to remove the redundant indicator, one-way gradually wiping the water resistance test area of the water-based UV finish H4M0125 by the wet paper towel or cotton cloth, namely covering the whole area covered by the toughened glass cover with the outer edge extending outwards by 2cm, and observing the test area in the process of indicator volatilization after wiping and wiping. The wet trace seen in the area 2B of fig. 4 is the trace of the indicator wipe, and a dark and discontinuous area is partially seen in the middle of the trace, which is the discontinuous light trace of the water resistance test. The 5 detection specialists visually and directly observe the surface of the paint film from a certain direction to see discontinuous slight marks, such as the discontinuous slight marks of the 2B area in FIG. 4, and judge the water resistance of the H4M0125 to be 2 grade by contrasting with the grading evaluation table in GB/T4893.1-2005.
Therefore, the presence or absence of a mark after the water resistance test of the paint film is more easily seen using the indicator of this example.
Example 3
The formulation of an indicator for paint film resistance testing is shown in Table 7
TABLE 7 paint film resistance test indicator formulation
Method for preparing indicator for paint film resistance test: according to the weight portion, 73.2 portions of deionized water, 1.5 portions of sodium dihydrogen phosphate, 0.25 portion of BYK-028, 10.0 portions of AS-801, 9.0 portions of CO-603, 4.0 portions of PEG-200, 2.0 portions of JD-3, 0.025 portion of Bioban586 and 0.025 portion of Skane M8 are added in sequence, stirred at a medium speed for 25min at the temperature of 60 ℃, filtered by 300 meshes of filter cloth and discharged, and the indicator for the paint film resistance test is obtained.
A water-based UV finish paint H4M0127 of Jia Bao Li chemical group Limited company is selected to be used for preparing a film on a black base plate, and a water resistance test is carried out according to GB/T4893.1-2005. Selecting two areas 3A and 3B of the surface of a water-based UV finish paint H4M0127 paint film, and dripping a certain amount of test water into the areas 3A and 3B simultaneously, wherein a picture 5 is a photograph schematic diagram of a state maintained after water drops from the areas 3A and 3B in the water resistance test until the water is wiped off.
After the test solution on the surface of the paint film of the double-component waterborne polyurethane finish paint H4M0127 is wiped off for 24 hours, the area 3A is wiped by using an indicator, the area 3B is not treated at all, and the photographing schematic diagram of the comparison result is shown in FIG. 6 (the actual detection process is that an inspector directly observes the surface of the paint film, and the diagram is not an observation picture, but only schematic).
After the test solution is wiped off for 24h, the 3B area is directly observed on the paint film surface by naked eyes without any treatment. The 3B area in FIG. 6 failed to show a water resistance test trace due to photographing, and no visible change was seen by 5 inspection specialists directly observing the paint film surface with naked eyes from all directions. And judging the water resistance of the H4M0127 to be 1 grade by comparing with a grading evaluation table in GB/T4893.1-2005.
After wiping off the test solution for 24h, the 3A site was wiped with an indicator while visually observing. Dipping a paint film resistance test indicator by using a paper towel or cotton cloth, extruding the paper towel or cotton cloth to remove redundant indicator, one-way gradually wiping the water resistance test area of the water-based UV finish paint H4M0127 by using the wet paper towel or cotton cloth, namely covering the whole area covered by the toughened glass cover with the outer edge extending outwards for 2cm, and observing the test area in the process of indicator volatilization after wiping and wiping. The wet trace seen in area 3A of fig. 6 is the trace of the indicator wipe, and no darker colored area, i.e., no water resistance test trace, is visible in the middle area of the trace. No visible change can be seen by 5 detection specialists directly observing the surface of the paint film by naked eyes from all directions, and the water resistance of H4M0127 is judged to be grade 1 by contrasting with a grading evaluation table in GB/T4893.1-2005.
Therefore, the water resistance of H4M0127 really reaches grade 1 in GB/T4893.1-2005.
Example 4
The formulation of an indicator for paint film resistance testing is shown in Table 8
TABLE 8 paint film resistance test indicator formulation
Method for preparing indicator for paint film resistance test: 81.8 parts of deionized water, 1.0 part of sodium bicarbonate, 0.15 part of BYK-028, 4.0 parts of sodium dodecyl benzene sulfonate, 9.0 parts of EH-9, 3.5 parts of sorbitol, 0.5 part of CBS-X, 0.025 part of Bioban586 and 0.025 part of Skane M8 are sequentially added in parts by weight, stirred at a medium speed of 70 ℃ for 30min and filtered by 300-mesh filter cloth to discharge, thus obtaining the indicator for the paint film resistance test.
A double-component waterborne polyurethane finish H2M0125 from Jia Bao Li chemical group Limited company is selected to be used for preparing a film on a black base plate, and a water resistance test is carried out according to GB/T4893.1-2005. After wiping off the test solution for 24 hours, the surface of the paint film is observed by naked eyes, and 5 detection specialists respectively judge that the water resistance is 2 grade, 3 grade and 3 grade according to a grading evaluation table in GB/T4893.1-2005. Where level 2 is a discontinuous slight impression seen from a certain direction and level 3 is a nearly complete circle seen from each direction. Dipping a paper towel or cotton cloth into a paint film resistance test indicator, extruding the paper towel or cotton cloth to remove redundant indicator, wiping a water resistance test area of the double-component waterborne polyurethane finish H2M0125 by the wet paper towel or cotton cloth in a one-way gradual mode, namely covering the whole area covered by the outer edge of the toughened glass cover extending outwards by 2cm, observing the test area of the paint film surface in the process of indicator volatilization after wiping and wiping, viewing nearly complete rings by 5 detection specialists from all directions, and judging the water resistance of the paint film to be 3 grades by contrasting a grading evaluation table in GB/T4893.1-2005. Thus, non-visible changes will be apparent, and originally visible changes will be more apparent, after wiping with the indicator of the present invention.
Example 5
The formulation of an indicator for paint film resistance testing is shown in Table 9
TABLE 9 paint film resistance test indicator formulation
Method for preparing indicator for paint film resistance test: 78.55 parts of deionized water, 1.5 parts of sodium dihydrogen phosphate, 0.1 part of TEGO-904W, 8.0 parts of AS-801, 8.0 parts of EH-9, 3.0 parts of glycerol, 0.8 part of JD-3, 0.025 part of Bioban586 and 0.025 part of Skane M8 are sequentially added in parts by weight, stirred at a medium speed for 20min at 70 ℃, filtered through 300-mesh filter cloth and discharged, and the indicator for the paint film resistance test is obtained.
A water-based UV finish H4M0125 from Jia Bao Li chemical group Limited company is selected to be used for preparing a film on a black base plate, and a water resistance test is carried out according to GB/T4893.1-2005. After wiping off the test solution for 24h, the surface of the paint film is observed by naked eyes, and 5 detection specialists respectively judge that the water resistance is 1 grade, 1 grade and 2 grade according to a grading evaluation table in GB/T4893.1-2005. Wherein level 1 is no visible change and level 2 is discontinuous slight impressions visible from a certain direction. Dipping a paint film resistance test indicator by using a paper towel or cotton cloth, extruding the paper towel or cotton cloth to remove redundant indicators, wiping a water resistance test area of the water-based UV finish paint H4M0125 by using the wet paper towel or cotton cloth in a one-way gradual mode, namely covering all areas covered by the outer edge of a toughened glass cover extending for 2cm outwards, observing the test area of the paint film surface in the process of indicator volatilization after wiping and wiping, viewing discontinuous slight impressions by 5 detection specialists from a certain direction, and judging the water resistance of the paint film to be 2 grade by contrasting a grading evaluation table in GB/T4893.1-2005. Therefore, the presence or absence of a mark after the water resistance test of the paint film is more easily seen using the indicator of this example.
It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. The paint film resistance test indicator is characterized by comprising the following raw materials in parts by weight: 73.2-82.3 parts of deionized water, 0.6-1.5 parts of buffering agent, 0.05-0.25 part of defoaming agent, 4.0-10.0 parts of anionic surfactant, 8.0-10.0 parts of nonionic surfactant, 2.5-4.0 parts of cosolvent, 0.5-2.0 parts of fluorescent whitening agent, 0.025 part of preservative and 0.025 part of mildew preventive;
the anionic surfactant is sodium dodecyl benzene sulfonate, sodium dodecyl sulfate or Dow chemical AS-801;
the nonionic surfactant is one of EH-9 of Dow chemical, AEO-7 of Pasteur and CO-630 of Solvay;
the fluorescent whitening agent is one of JADEWIN CBS-X, fluorescent whitening agent 33 and fluorescent whitening agent JD-3.
2. The paint film resistance test indicator according to claim 1, wherein the buffer is one of sodium carbonate, sodium bicarbonate, and sodium dihydrogen phosphate.
3. The paint film resistance test indicator according to claim 1, wherein the antifoaming agent is one of TEGO-902W, TEGO-904W and BYK-028.
4. The paint film resistance test indicator according to claim 1, wherein the co-solvent is one of glycerin, sorbitol, and polyethylene glycol PEG-200.
5. Paint film resistance test indicator according to claim 1, characterized in that the preservative is Bioban586 from dow chemical.
6. The paint film resistance test indicator according to claim 1, characterized in that the mildewcide is Skane M8 of Dow chemistry.
7. A method of producing a paint film resistance test indicator according to any one of claims 1 to 6, characterized in that deionized water, a buffer, a defoaming agent, an anionic surfactant, a nonionic surfactant, a cosolvent, a fluorescent whitening agent, a preservative, and a mildewproof agent are mixed, stirred uniformly, and the discharge is filtered to obtain the paint film resistance test indicator.
8. The method for preparing the paint film resistance test indicator according to claim 7, wherein the stirring uniformly means stirring at a medium speed for 15-30min at 60-70 ℃, and the filtering is performed through a 300-mesh filter cloth.
9. Use of a paint film resistance test indicator according to any one of claims 1 to 6, characterized in that the paint film resistance test indicator is dipped in paper towel or cotton cloth, excess indicator is removed by squeezing the paper towel or cotton cloth, the test area is wiped with the paper towel or cotton cloth dipped in the paint film resistance test indicator in a stepwise unidirectional manner, the test area is observed for the presence of test traces during volatilization after wiping the indicator, and the resistance rating is determined by comparison with the rating table in GB/T4893.1-2005.
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