CN113063799B - Stain resistance test method suitable for hydrophobic coating - Google Patents
Stain resistance test method suitable for hydrophobic coating Download PDFInfo
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- CN113063799B CN113063799B CN202110292698.9A CN202110292698A CN113063799B CN 113063799 B CN113063799 B CN 113063799B CN 202110292698 A CN202110292698 A CN 202110292698A CN 113063799 B CN113063799 B CN 113063799B
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- 238000000576 coating method Methods 0.000 title claims abstract description 70
- 239000011248 coating agent Substances 0.000 title claims abstract description 59
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 21
- 238000010998 test method Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 185
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000011010 flushing procedure Methods 0.000 claims abstract description 31
- 238000005507 spraying Methods 0.000 claims abstract description 26
- 239000003973 paint Substances 0.000 claims abstract description 16
- 238000002310 reflectometry Methods 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 13
- 239000010881 fly ash Substances 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000007921 spray Substances 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 15
- 239000003595 mist Substances 0.000 claims description 12
- 239000002956 ash Substances 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000010009 beating Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000009736 wetting Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000004753 textile Substances 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 238000010410 dusting Methods 0.000 claims 1
- 230000001680 brushing effect Effects 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 10
- 238000003618 dip coating Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 4
- 239000000725 suspension Substances 0.000 description 8
- 238000007598 dipping method Methods 0.000 description 6
- 238000011109 contamination Methods 0.000 description 5
- 125000004122 cyclic group Chemical group 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000005661 hydrophobic surface Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 241000132023 Bellis perennis Species 0.000 description 1
- 235000005633 Chrysanthemum balsamita Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/94—Investigating contamination, e.g. dust
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a stain resistance test method suitable for a hydrophobic coating, which specifically comprises the following steps: preparing and curing a test plate, measuring initial reflectivity, spraying for the first time, spraying ash, spraying for the second time, drying, flushing, circulating for the second time and measuring final reflectivity; the invention provides a stain-resistant test pollution source application method which has wider universality, more uniform application Tu Ban effect, more stable test result and less consumption, the process is controllable, the error brought by people is greatly reduced, the error of the method is reduced, the defect that the industry standard cannot effectively and uniformly apply the surface of a hydrophobic paint film is overcome, the problem that the consumption of a brushing method, particularly a dip-coating method, is large is solved, the problem that the effect of a test board is uneven is solved, the problem that the brushing method and the dip-coating method cannot simultaneously perform a large-batch test board test with controllable conditions is solved, and the defect in the original stain-resistant test method is greatly improved.
Description
Technical Field
The invention particularly relates to the field of emulsion performance test for building coatings, in particular to a stain resistance test method suitable for a hydrophobic coating.
Background
The exterior wall building coating can be influenced by dust in the air, turbid water flowing downwards from a roof or a windowsill and the like in the long-term application process, so that the attractiveness of the exterior wall coating is greatly reduced, and a testing method for accurately evaluating the stain resistance of the exterior wall coating is particularly important.
GB/T9780-2013 "stain resistance test method for architectural coating" discloses a method for testing stain resistance of a paint film: brushing method: the pollution source (fly ash: water=1:1) suspension is uniformly coated on the surface of a coated test plate in a transverse direction and a vertical direction, wherein the coating amount of the pollution source suspension is 0.7+/-0.1 g per test piece. Dipping method: the pollution source (fly ash: water=1:1) suspension was poured into a flat bottom tray, the cured test panel was placed with the coating side facing downward, immersed horizontally in the tray for 5s, and then removed with the coating side facing upward.
However, the brush coating method and the dipping method have the following problems:
(1) Brushing method: the consumption of the fly ash is large, the universality of brushing is poor, the method cannot be suitable for a stain-resistant test of a paint film with strong hydrophobicity, brushing is uneven, the influence of brushing force is high, the influence of the result is high, the reproducibility of test results of different people is poor, meanwhile, the difference of results can be caused by different materials of the brush and the hardness degree before application, the problem of stagnation of brushing exists in brushing, the brushing quality is difficult to accurately control, the quality is required to be adjusted by brushing frequently and many times, the original surface physical property of the paint film can be damaged, the adsorbed fly ash in the first cycle test process can be damaged, in addition, in a large number of tests, the problem of sinking of a pollution source exists, the concentration of the fly ash is higher and higher along with the increase of brushing test boards, and the content of the fly ash in the pollution source applied before and after being difficult to achieve is consistent.
(2) Dipping method: the consumption of the fly ash is extremely large, the universality is poor, the method is also not suitable for the stain resistance test of a paint film with strong hydrophobicity, the plate effect is not very good when the test plate is applied, uneven flow of a pollution source is caused when the test plate is overturned after the dip-coating is finished, the non-test part of the test plate is also easy to be polluted and dirty, the aesthetic property of the test plate is greatly influenced, the test environment is also easy to be polluted, in addition, the influence of the fly ash sinking in the pollution source is also avoided, and the consistency of the concentration of the fly ash applied before and after the batch test cannot be ensured.
In summary, the above problems seriously affect the accuracy and reproducibility of the stain resistance test results of paint films. Therefore, there is a need to develop a contamination resistant source application method that is more versatile, more uniformly effective in application Tu Ban, and more stable in test results.
Disclosure of Invention
The invention aims to provide a stain resistance test method suitable for a hydrophobic coating, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a stain resistance test method suitable for a hydrophobic coating specifically comprises the following steps: .
(1) Preparing and curing a test panel: preparing and maintaining a test board by the paint to be tested according to the specification in GB/T9780-2013;
(2) Initial reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the initial reflection coefficient of the test board, and taking an average value A;
(3) Spraying: putting the test plate on a scale pan, clearing, then spraying mist water to the upper space of the test plate by using a high-pressure spray bottle to enable the mist water to freely fall on the surface of the test plate to moisten the test plate, and spraying 0.4g-0.5g;
(4) And (5) ash scattering: inverting the national standard fly ash sample tank sleeved with the filter screen to enable the filling opening to face downwards, lightly beating the edge of the filling opening by using a bar-shaped object to enable the fly ash to be uniformly scattered on the surface of the test board, adsorbing and wetting small water drops on the surface of the test board, and enabling the mass of the fly ash to be 0.5g-0.6g;
(5) Second spraying: spraying mist water to the upper part of the test board by using a high-pressure spray bottle to enable the mist water to freely drop on the surface of the test board so as to completely wet the fly ash on the surface of the test board, and spraying 0.4g-0.5g;
(6) And (3) drying: drying in a 60+ -2 oven for 0.5h, taking out, and standing under standard test conditions (23+ -2deg.C, relative humidity 50% + -5%) for 2h; the method comprises the steps of carrying out a first treatment on the surface of the
(7) Flushing: placing the test plate on a test plate frame of a flushing device, opening a valve of the flushing device filled with 15L of water to the maximum, flushing the coating test plate, continuously moving the coating test plate during flushing to enable water flow to flush all parts uniformly, closing the valve after flushing for 1min, and placing the coating test plate for the next day under standard test conditions;
the steps (3) to (7) are first circulation, and the whole circulation is 24 hours;
(8) Second cycle: repeating the steps (3) -7);
(9) Final reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the final reflection coefficient of the test board, and taking an average value B;
(10) And (3) calculating: the stain resistance of the outer wall coating is as follows: x= |A-B|/A is 100%, the result is an arithmetic average value of three test plates, 2-bit effective values are reserved, and the relative error of parallel measurement of the three test plates is not more than 15%.
Further aspects; the coating to be tested in step (1) may be a coating having a specific hydrophobic function.
Still further aspects are as follows: the precision of the electronic balance in the step (3), the step (4) and the step (5) is 0.01g, and the support area of the scale pan is smaller than or equal to the area of the test panel, so that the test panel can cover the scale pan completely, and the evenly scattered fly ash can be collected quantitatively.
Still further aspects are as follows: the high-pressure spray bottle in the step (3) and the step (5) has the capacity of 200 ml-400 ml, and can be pressed for more than 3 seconds continuously and uniformly to form the superfine atomization high-pressure spray bottle, so that atomization is good, spraying is uniform, a large number of fine water drops are uniformly distributed on the hydrophobic surface, and meanwhile, the small water drops cannot be excessively condensed into large water drops, so that the area of the hydrophobic surface can be wetted by water to the greatest extent, and the uniformity of test results is greatly improved.
Still further aspects are as follows: the spraying direction of the high-pressure spray bottle in the step (3) and the step (5) is required to form an upward included angle of 0-45 degrees with the surface of the test plate, the horizontal distance between the spray head and the test plate is suitable for most of atomized water drops to drop on the surface of the test plate, the horizontal height of the spray head is required to be higher than the height of the surface of the test plate, so that the spray can show parabolic tracks to freely drop on the surface of the test plate, and the spray pot can be moved left and right in the long-side direction of the test plate to better ensure uniform spraying during spraying.
Still further aspects are as follows: the fly ash tank mouth in the step (4) is sleeved with a layer of filter screen which needs to be kept dry before use, the filter screen is any one or a combination of a textile fiber filter screen or a hardware filter screen, the mesh number of the filter screen is 100-180 meshes, and the gap size of the filter screen can be evenly, finely and slowly scattered when the tank mouth is lightly knocked.
Still further aspects are as follows: the filter screen at the fly ash tank opening in the step (4) is fixed by a strip or a ring-mounted hollow cover, the fixed object can be any one of a rubber strip, a metal wire, a rope or the hollow cover, and the fixed object can enable the filter screen to be in a tight state and not loose and fall off when being knocked.
Still further aspects are as follows: the rod-shaped object in the step (4) is any one of a glass rod, a wood rod and an iron rod.
Still further aspects are as follows: in the step (4), the fly ash is scattered transversely along the long side and then vertically along the short side so as to uniformly spread the fly ash on the surface of the paint film.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a contamination resistance test pollution source application method which has wider universality, more uniform application Tu Ban effect, more stable test result and less consumption, the process is controllable, the error caused by manpower is reduced to the greatest extent, and the error of the method is reduced. Compared with the test standard GB/T9780-2013 of the industry, the invention can also make up the defect that the industry standard cannot effectively and uniformly apply the surface of the hydrophobic paint film, solves the problems of high consumption of the brush coating method, particularly the fly ash of the dip coating method, and uneven effect of the test board surface of the brush coating method and the dip coating method, and solves the problem that the brush coating method and the dip coating method cannot simultaneously perform a large number of test board tests with controllable conditions (the concentration of the front fly ash and the rear fly ash), thereby greatly improving the defects in the original test method of stain resistance.
Drawings
Fig. 1 is a drawing of a first cyclic application Tu Xiaoguo (example 1).
Fig. 2 is a drawing of a first cyclic application Tu Xiaoguo (example 2).
Fig. 3 is a drawing of first cyclic application Tu Xiaoguo (example 3).
Fig. 4 is the final board effect drawing (example 1).
Fig. 5 is the final board effect drawing (example 2).
Fig. 6 is the final board effect drawing (example 3).
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The test emulsion is a common commercial product meeting the building coating standard, and the choice in this example is a hydrophobic finish emulsion.
The fly ash is a national standard sample conforming to GSB 08-2992-2019 ash standard sample for pollution resistance test of building coating, and the high-pressure spray bottle, the electrothermal blowing drying box, the paint mixing knife, the electronic balance and the filter screen can be all commonly sold in the market, wherein the high-pressure spray bottle has the capacity of a Daisy leaf brand SUSA-014W type 200ml white spray bottle distributed by Shanghai Cheng Co., ltd, and the electronic balance is produced by De Ante sensing technology Co., ltd., tianjin, and the electrothermal blowing drying box is 101-2A type.
The electronic balance is obtained by refitting, namely replacing a tray with a supporting area smaller than the area of the test board, or combining a flat plate with an area smaller than the area of the test board and a bracket.
The stain resistance test method in the examples is carried out according to the method B of the stain resistance test method of the exterior wall coating in GB/T9780-2013, the stain resistance test method of the building coating, namely a brushing method, a dipping method and a patent application method, wherein the brushing method and the dipping method are applied according to standard methods, and the final result is characterized by the reflectivity reduction rate.
Example 1
(1) Preparing and curing a test panel: preparing and maintaining a test board by the paint to be tested according to the specification in GB/T9780-2013;
(2) Initial reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the initial reflection coefficient of the test board, and taking an average value A;
(3) Spraying: putting the test plate on a scale pan, clearing, then spraying mist water to the upper space of the test plate by using a high-pressure spray bottle to enable the mist water to freely fall on the surface of the test plate to moisten the test plate, and spraying 0.4g-0.5g;
(4) And (5) ash scattering: inverting the national standard fly ash sample tank sleeved with the filter screen to enable the filling opening to face downwards, lightly beating the edge of the filling opening by using a paint adjusting knife to enable the fly ash to be uniformly scattered on the surface of the test board, adsorbing and wetting small water drops on the surface of the test board (figure 5), and enabling the mass of the fly ash to be 0.5g-0.6g;
(5) Second spraying: spraying mist water to the upper part of the test board by using a high-pressure spray bottle to enable the mist water to freely drop on the surface of the test board so as to completely wet the fly ash on the surface of the test board, and spraying 0.4g-0.5g;
(6) And (3) drying: drying in oven at 60+ -2deg.C for 0.5 hr, taking out, and standing under standard test conditions for 2 hr;
(7) Flushing: placing the test plate on a test plate frame of a flushing device, opening a valve of the flushing device filled with 15L of water to the maximum, flushing the coating test plate, continuously moving the coating test plate during flushing to enable water flow to flush all parts uniformly, closing the valve after flushing for 1min, and placing the coating test plate for the next day under standard test conditions;
the steps (3) to (7) are first circulation, and the whole circulation is 24 hours;
(8) Second cycle: repeating the steps (3) -7);
(9) Final reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the final reflection coefficient of the test board, and taking an average value B;
(10) And (3) calculating: the stain resistance of the outer wall coating is as follows: x= |A-B|/A is 100%, the result is an arithmetic average value of three test plates, 2-bit effective values are reserved, and the relative error of parallel measurement of the three test plates is not more than 15%.
Example 2
(1) Preparing and curing a test panel: preparing and maintaining test boards of the paint to be tested according to the specification in GB/T9780-2013, and preparing 3 test boards for each sample;
(2) Initial reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the initial reflection coefficient of the test board, and taking an average value A;
(3) Preparing a pollution source: weighing a proper amount of ash standard sample for test, wherein the mass ratio of the ash standard sample for test to water is 1:1, and fully and uniformly stirring to prepare suspension;
(4) Brushing: uniformly brushing a pollution source suspension liquid on the surface of a coating test plate by using a soft brush according to the transverse direction and the vertical direction, wherein the brushing amount of the pollution source suspension liquid is 0.7+/-0.1 g of each test piece;
(5) And (3) drying: putting the mixture into a baking oven at the temperature of (60+/-2) ℃ for drying for 0.5h, and taking out;
(6) Flushing: placing the test plate on a test plate frame of a flushing device, opening a flushing device valve filled with 15L of water to the maximum, flushing the coating test plate, continuously moving the coating test plate during flushing to enable water flow to flush all parts uniformly, closing the valve after flushing for 1min, placing the coating test plate on the second day under standard test conditions, wherein the steps (3) to (7) are first circulation, and the whole circulation is 24h;
(7) Second cycle: repeating the steps (3) -7);
(8) Final reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the final reflection coefficient of the test board, and taking an average value B;
(9) And (3) calculating: the stain resistance of the outer wall coating is as follows: x= |A-B|/A is 100%, the result is an arithmetic average value of three test plates, 2-bit effective values are reserved, and the relative error of parallel measurement of the three test plates is not more than 15%.
Example 3
(1) Preparing and curing a test panel: preparing and maintaining a test board by the paint to be tested according to the specification in GB/T9780-2013;
(2) Initial reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the initial reflection coefficient of the test board, and taking an average value A;
(3) Preparing a pollution source: weighing a proper amount of ash standard sample for test, wherein the mass ratio of the ash standard sample for test to water is 1:1, and fully and uniformly stirring to prepare suspension;
(4) Dip coating: the contamination source suspension is poured into a flat bottom tray. The coated surface was placed face down, horizontally in a tray, immersed for 5 seconds, and then taken out with the coated surface facing up.
(5) And (3) drying: putting the mixture into a baking oven at the temperature of (60+/-2) ℃ for drying for 0.5h, and taking out;
(6) Flushing: placing the test plate on a test plate frame of a flushing device, opening a flushing device valve filled with 15L of water to the maximum, flushing the coating test plate, continuously moving the coating test plate during flushing to enable water flow to flush all parts uniformly, closing the valve after flushing for 1min, placing the coating test plate on the second day under standard test conditions, wherein the steps (3) to (7) are first circulation, and the whole circulation is 24h;
(7) Second cycle: repeating steps (3) - (7);
(8) Final reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the final reflection coefficient of the test board, and taking an average value B;
(9) And (3) calculating: the stain resistance of the outer wall coating is as follows: x= |A-B|/A is 100%, the result is an arithmetic average value of three test plates, 2-bit effective values are reserved, and the relative error of parallel measurement of the three test plates is not more than 15%.
The data comparison results are shown in tables 1, 2 and 3:
table 1: comparative stain resistance results for example 1, example 2, example 3;
table 2: reflectance test value ranges for the coatings of example 1, example 2, example 3 after contamination test;
table 3: example 1, example 2, example 3 test procedure data comparison.
Note that: A. b, X (V),The initial average reflectance of the coating, the average reflectance of the coating after contamination test, the reflectance reduction rate of the coating and the average reduction rate of the reflectance of the coating are respectively represented in percent. Bmax and Bmin represent the maximum reflection coefficient and the minimum reflection coefficient which appear in the final reflection coefficient point taking test process respectively, and the unit is%.
Examples 1-3 during the stain resistance test, as can be seen from Table 3, the level of ease of application of the stain source was, in order (from easy to difficult): example 1 > example 2 > example 3, and the uniformity of the overall test panel effect was: example 1 > example 3. Apprxeq. Example 2, the method is well applicable to the stain resistance test of a hydrophobic paint film, the application is easier, the effect of the tested plate surface is very uniform, and the range of the test result of the reflectivity coefficient is shown in Table 2: example 2 is approximately equal to example 3 > example 1, which means that the method of the invention has smaller numerical fluctuation and smaller error in the reflectivity coefficient sampling test process, and can give accurate and stable judgment results.
In the process of implementing the 1-3 stain resistance test, as can be seen from table 3, the consumption of fly ash is as follows: example 3 > example 2 > example 1, the method of the invention can greatly reduce the consumption of the fly ash and reduce the waste.
As can be seen from comparison of the stain resistance test results (Table 1) of the architectural coating obtained in examples 1-3, the reflectance of the coating in the stain source application method of the present invention is similar to that of the dip coating method, and is inferior to that of the brush coating method, because both the two coating methods rely on the adsorption force of the coating itself to the fly ash to produce natural adsorption, rather than forced coating, and the fly ash falling off caused by the second cycle brush coating is avoided, so that the reflectance of the coating obtained by the test method of the present invention is similar to that of the dipping method in the test method for stain resistance of architectural coating using GB/T9780-2013, and the feasibility and scientificity of the method are well illustrated.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (9)
1. The stain resistance test method suitable for the hydrophobic coating is characterized by comprising the following steps of:
(1) Preparing and curing a test panel: preparing and maintaining a test board by the paint to be tested according to the specification in GB/T9780-2013;
(2) Initial reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the initial reflection coefficient of the test board, and taking an average value A;
(3) Spraying: putting the test plate on a scale pan, clearing, then spraying mist water to the upper space of the test plate by using a high-pressure spray bottle to enable the mist water to freely fall on the surface of the test plate to moisten the test plate, and spraying 0.4g-0.5g;
(4) And (5) ash scattering: inverting the national standard fly ash sample tank sleeved with the filter screen to enable the filling opening to face downwards, lightly beating the edge of the filling opening by using a bar-shaped object to enable the fly ash to be uniformly scattered on the surface of the test board, adsorbing and wetting small water drops on the surface of the test board, and enabling the mass of the fly ash to be 0.5g-0.6g;
(5) Second spraying: spraying mist water to the upper part of the test board by using a high-pressure spray bottle to enable the mist water to freely drop on the surface of the test board so as to completely wet the fly ash on the surface of the test board, and spraying 0.4g-0.5g;
(6) And (3) drying: drying in a 60+ -2 oven for 0.5h, taking out, and standing at 23+ -2deg.C with relative humidity of 50% + -5% for 2h;
(7) Flushing: placing the test plate on a test plate frame of a flushing device, opening a valve of the flushing device filled with 15L of water to the maximum, flushing the coating test plate, continuously moving the coating test plate during flushing to enable water flow to flush all parts uniformly, closing the valve after flushing for 1min, and placing the coating test plate for the next day under standard test conditions;
the steps (3) to (7) are first circulation, and the whole circulation is 24 hours;
(8) Second cycle: repeating the steps (3) -7);
(9) Final reflectance measurement: taking a plurality of points at the upper, middle and lower positions of the test board by using a reflectivity meter to test the final reflection coefficient of the test board, and taking an average value B;
(10) And (3) calculating: the stain resistance of the outer wall coating is as follows: x= |A-B|/A is 100%, the result is an arithmetic average value of three test plates, 2-bit effective values are reserved, and the relative error of parallel measurement of the three test plates is not more than 15%.
2. The method for stain resistance testing of hydrophobic coatings according to claim 1, wherein the coating to be tested in step (1) is a coating having a hydrophobic function.
3. The method for testing the stain resistance of the hydrophobic coating according to claim 1, wherein the electronic balance in the step (3), the step (4) and the step (5) has an accuracy of 0.01g, and the scale support area is smaller than or equal to the test panel area.
4. The method for testing the stain resistance of the hydrophobic coating according to claim 1, wherein the high-pressure spray bottle in the step (3) and the step (5) has a capacity of 200ml to 400ml, and can be pressed for more than 3 seconds after being continuously and uniformly discharged.
5. The method for testing the stain resistance of the hydrophobic coating according to claim 1, wherein the spraying direction of the high-pressure spray bottle in the step (3) and the step (5) is required to have an upward included angle of 0-45 degrees with the surface of the test plate, the horizontal height of the spray head is required to be higher than the surface of the test plate, and the horizontal distance of the spray head from the test plate is required to enable most of atomized water drops to drop on the surface of the test plate.
6. The method for testing the stain resistance of the hydrophobic coating according to claim 1, wherein the fly ash tank opening in the step (4) is sleeved with one or more layers of filter screens, the filter screens are kept dry before use, the filter screens are any one or a combination of a textile fiber filter screen or a hardware filter screen, and the mesh number of the filter screens is 100-180 meshes.
7. The method for testing the stain resistance of the hydrophobic coating according to claim 1, wherein the filter screen at the mouth of the fly ash tank in the step (4) is fixed by a strip-shaped object or a ring-mounted hollow cover, the fixed object is any one of a rubber strip, a metal wire, a rope or a hollow cover, and the fixed object can enable the filter screen to be in a tight state, and the filter screen is not loosened and falls off when being knocked.
8. The method for stain resistance testing of hydrophobic coatings of claim 1, wherein the stick in step (4) is any one of a glass stick, a wood stick, and an iron stick.
9. The method for stain resistance testing of hydrophobic coatings of claim 1, wherein the dusting direction in step (4) is: the liquid is firstly spread transversely along the long side direction and then spread vertically along the short side direction.
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