CN113063799A - Stain resistance test method suitable for hydrophobic coating - Google Patents
Stain resistance test method suitable for hydrophobic coating Download PDFInfo
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- CN113063799A CN113063799A CN202110292698.9A CN202110292698A CN113063799A CN 113063799 A CN113063799 A CN 113063799A CN 202110292698 A CN202110292698 A CN 202110292698A CN 113063799 A CN113063799 A CN 113063799A
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- 238000000576 coating method Methods 0.000 title claims abstract description 76
- 239000011248 coating agent Substances 0.000 title claims abstract description 62
- 238000010998 test method Methods 0.000 title claims abstract description 22
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 171
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000010881 fly ash Substances 0.000 claims abstract description 27
- 238000005507 spraying Methods 0.000 claims abstract description 26
- 238000002310 reflectometry Methods 0.000 claims abstract description 13
- 239000002956 ash Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000011010 flushing procedure Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000007921 spray Substances 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 13
- 239000003665 fog water Substances 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 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
- 239000000203 mixture Substances 0.000 claims 1
- 230000001680 brushing effect Effects 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 14
- 239000003973 paint Substances 0.000 abstract description 11
- 238000011109 contamination Methods 0.000 abstract description 9
- 238000003618 dip coating Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 4
- 239000010883 coal ash Substances 0.000 description 8
- 239000000725 suspension Substances 0.000 description 8
- 238000007598 dipping method Methods 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 239000007788 liquid 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 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
- 239000000843 powder Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
Abstract
The invention discloses a stain resistance test method suitable for a hydrophobic coating, which specifically comprises the following steps: preparing and maintaining a test plate, measuring initial reflectivity, spraying for the first time, scattering ash, spraying for the second time, drying, flushing, circulating for the second time and measuring final reflectivity; the invention provides a contamination-resistant test pollution source coating method which has wider universality, more uniform coating plate coating effect, more stable test result and less consumption, the process is controllable, the error caused by human factors is greatly reduced, the method error is reduced, the defect that the industrial standard cannot effectively and uniformly coat the surface of a hydrophobic paint film is overcome, the problem that the brushing method, especially the dip-coating method has high fly ash consumption is solved, the problem that the two methods can not test the plate surface effect uniformly is solved, the problem that the brushing method and the dip-coating method can not simultaneously carry out large-batch test plate tests with controllable conditions is solved, and the defects in the original contamination-resistant test method are greatly improved.
Description
Technical Field
The invention particularly relates to the field of performance test of emulsion for building coatings, and particularly relates to a stain resistance test method suitable for a hydrophobic coating.
Background
The exterior wall building coating is influenced by dust in the air, muddy water flowing downwards from a roof or a windowsill and the like in the long-term application process, and the attractiveness of the exterior wall coating is greatly reduced, so that the test method for accurately evaluating the contamination resistance of the exterior wall coating is very important.
GB/T9780 and 2013, building coating stain resistance test method, disclose a test method of stain resistance of a paint film: brushing: and (3) uniformly brushing the suspension of the pollution source (coal ash: water: 1) on the surface of the coating test plate transversely and vertically by using a soft brush, wherein the brushing amount of the suspension of the pollution source is 0.7 +/-0.1 g of each test piece. The dipping method comprises the following steps: and (3) pouring the suspension of the pollution source (coal ash: water: 1) into a flat-bottom tray, putting the maintained test board with the coating surface facing downwards, horizontally putting the test board into the tray, soaking for 5 seconds, and taking out the test board with the coating surface facing upwards.
However, the brush coating method and the dipping method have the following problems:
(1) brushing: the fly ash consumption is large, the brushing universality is poor, the paint powder coating is not suitable for a stain resistance test of a paint film with strong hydrophobicity, the brushing is uneven, the result is greatly influenced due to the influence of brushing force, the test result reproducibility of different people is poor, the difference of the result can be caused by different brush materials and different hardness degrees before being coated, the brushing is difficult to control accurately, the quality can be adjusted by frequent and multiple brushing, the original surface physical property of the paint film can be damaged, the fly ash adsorbed in the first cycle test process can be damaged, in addition, in a large-batch test, the pollution source has the problem of sinking, the fly ash concentration can be higher and higher along with the increase of the brushing test plates, and the consistent content of the fly ash in the pollution source applied before and after the brushing can be difficult to realize.
(2) The dipping method comprises the following steps: the fly ash consumption is very high, the universality is poor, the method cannot be suitable for a stain resistance test of a paint film with strong hydrophobicity, the effect of coating the board is not very good, a pollution source flows unevenly when the board is turned over after dip-coating is finished, so that the unevenness of the board surface is aggravated, non-test parts of the board are easily polluted and dirty, the attractiveness of the board is greatly influenced, the test environment is easily polluted, in addition, the influence of the deposition of the fly ash in the pollution source is also received, and the consistency of the fly ash concentration coated before and after mass test cannot be ensured.
In summary, the above problems can seriously affect the accuracy and reproducibility of the stain resistance test results of paint films. Therefore, it is necessary to develop a contamination source resistant coating method which has wider universality, more uniform coating effect and more stable test result.
Disclosure of Invention
The object of the present invention is to provide a stain resistance test method suitable for hydrophobic coatings to solve the problems set forth in the background art described above.
In order to achieve the purpose, the invention provides the following technical scheme:
a stain resistance test method suitable for a hydrophobic coating specifically comprises the following steps: .
(1) Preparing and maintaining a test plate: preparing and maintaining a test board for the coating to be tested according to the regulations in GB/T9780-;
(2) initial reflectance measurement: using a reflectivity meter to take a plurality of points from the middle-lower three positions on a test plate to test the initial reflection coefficient, and taking an average value A;
(3) first spraying: placing the test plate on a scale pan, resetting, spraying fog water to the upper space of the test plate by using a high-pressure spray bottle, enabling the fog water to freely fall on the surface of the test plate to moisten the test plate, and spraying 0.4g-0.5 g;
(4) ash spreading: the national standard coal ash sample tank sleeved with the filter screen is inverted, a filling opening faces downwards, the edge of the filling opening is lightly knocked by a rod-shaped object, so that the coal ash is uniformly sprinkled on the surface of a test board and is adsorbed and wetted by small water drops on the surface of the test board, and the mass of the coal ash is 0.5g-0.6 g;
(5) and (3) second spraying: spraying fog water to the upper space of the test board by using a high-pressure spray bottle, so that the fog water freely falls on the surface of the test board to completely wet the fly ash on the surface of the test board, and spraying 0.4g-0.5 g;
(6) and (3) drying: drying in 60 + -2 oven for 0.5h, taking out, and standing under standard test conditions (23 + -2 deg.C, relative humidity 50% + -5%) for 2 h; (ii) a
(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 coated test plate, continuously moving the coated test plate during flushing to enable water flow to flush all parts uniformly, closing the valve after flushing for 1min, and placing the coated test plate under standard test conditions for the next day, wherein the cycle is one cycle, and the whole cycle is 24 hours;
(8) and a second circulation: repeating the step (3) to the step (7);
(9) final reflectance measurement: using a reflectivity meter to take a plurality of points from the middle-lower three positions on the test plate to test the final reflection coefficient, and taking an average value B;
(10) and (3) calculating: the stain resistance of the outer wall coating is as follows: and X is | A-B |/A100%, the arithmetic mean value of three test plates is obtained, 2-bit effective value is reserved, and the relative error of the parallel measurement of the three test plates is not more than 15%.
Further, the scheme is as follows; the coating to be tested in the step (1) may be a coating having a special hydrophobic function.
Further scheme: the precision of the electronic balance in the step (3), the step (4) and the step (5) is 0.01g, and the area of the scale pan supporting area is smaller than or equal to the area of the test plate, so that the test plate can completely cover the scale pan, and the uniformly scattered fly ash can be quantitatively collected.
Further scheme: the capacity of the high-pressure spray bottle in the step (3) and the step (5) is 200 ml-400 ml, the superfine atomization high-pressure spray bottle capable of continuously and uniformly discharging water for more than 3 seconds can be pressed once, atomization is good, spraying is dense and uniform, a large number of fine water drops can be uniformly distributed on the water drainage surface, meanwhile, the small water drops cannot be excessively condensed into large water drops, the area of the water drainage surface can be wetted by water to the maximum extent, and the uniformity of test results is greatly improved.
Further scheme: the spraying direction of the high-pressure spray bottle in the step (3) and the step (5) needs to be 0-45 degrees of an upward included angle with the surface, the horizontal distance between the spray head and the test board is suitable for most atomized water drops to fall on the surface of the test board, the horizontal height of the spray head needs to be higher than the surface height of the test board, so that the spraying can be guaranteed to freely fall on the surface of the test board along the trajectory of a parabola, and when the spraying is carried out, the spraying can be better guaranteed to be uniformly sprayed in the left-right movement direction of the long edge of the test board.
Further scheme: the fly ash tank opening in the step (4) is sleeved with a layer of filter screen, the filter screen needs to be kept dry before use, the filter screen is one or a combination of a textile fiber filter screen and a hardware filter screen, the mesh number of the filter screen is 100-180 meshes, and the size of the gap can be just small and uniform when the tank opening is lightly knocked.
Further scheme: the filter screen at the opening of the fly ash tank in the step (4) needs to be fixed by a strip-shaped object or a hollow cover arranged in a ring mode, the fixed object can be 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 not to loosen and fall off when being knocked.
Further scheme: the rod-shaped object in the step (4) is any one of a glass rod, a wood rod and an iron rod.
Further scheme: when the ash is scattered in the step (4), the ash is firstly scattered transversely along the long edge and then scattered vertically along the short edge, so that the fly ash is uniformly scattered on the surface of the paint film.
Compared with the prior art, the invention has the beneficial effects that: the contamination-resistant test pollution source coating method provided by the invention has the advantages of wider universality, more uniform coating plate effect, more stable test result and less consumption, the process is controllable, the errors caused by human factors are greatly reduced, and the errors of the method are reduced. Compared with the industry test standard GB/T9780-2013 building coating stain resistance test method, the invention can make up the defect that the industry standard can not effectively and uniformly apply the hydrophobic paint film surface, simultaneously solves the problems of large fly ash consumption of the brushing method, especially the dip coating method, and uneven plate surface test effect of the brushing method and the dip coating method, and also solves the problem that the brushing method and the dip coating method can not simultaneously carry out condition-controllable large-batch test on the test plate (the problem of the concentration of the fly ash before and after the test plate), thereby greatly improving the defects of the original stain resistance test method.
Drawings
FIG. 1 is a graph showing the effect of the first cycle application (example 1).
Figure 2 is a graph of the first cycle application effect (example 2).
FIG. 3 is a graph showing the effect of the first cycle application (example 3).
FIG. 4 shows the final plate effect (example 1).
FIG. 5 shows the final plate effect (example 2).
FIG. 6 shows the final plate effect (example 3).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of the present invention.
The test emulsion is a common commercial product that can meet architectural coating standards, and the choice in this example is a hydrophobic finish emulsion.
The fly ash is a national standard sample which accords with GSB 08-2992-.
The electronic balance is obtained by modifying, namely replacing a tray with a supporting area smaller than the area of the test plate, or combining a flat plate with an area smaller than the area of the test plate and a bracket.
In the embodiment, the stain resistance test method is a test according to a method B of a stain resistance test method of an outer wall coating in GB/T9780 and 2013, namely a stain resistance test method of an architectural coating, and only the application method of a pollution source, namely a brushing method, a dipping method and a coating method in the patent, is changed, wherein the brushing method and the dipping method are applied according to a standard method, and the final result is characterized by a reflectivity reduction rate.
Example 1
(1) Preparing and maintaining a test plate: preparing and maintaining a test board for the coating to be tested according to the regulations in GB/T9780-;
(2) initial reflectance measurement: using a reflectivity meter to take a plurality of points from the middle-lower three positions on a test plate to test the initial reflection coefficient, and taking an average value A;
(3) first spraying: placing the test plate on a scale pan, resetting, spraying fog water to the upper space of the test plate by using a high-pressure spray bottle, enabling the fog water to freely fall on the surface of the test plate to moisten the test plate, and spraying 0.4g-0.5 g;
(4) ash spreading: the national standard coal ash sample tank sleeved with the filter screen is inverted, a filling opening faces downwards, the edge of the filling opening is slightly knocked by a paint mixing knife, so that the coal ash is uniformly scattered on the surface of a test board, small water drops on the surface of the test board are adsorbed and wetted (figure 5), and the mass of the coal ash is 0.5g-0.6 g;
(5) and (3) second spraying: spraying fog water to the upper space of the test board by using a high-pressure spray bottle, so that the fog water freely falls on the surface of the test board to completely wet the fly ash on the surface of the test board, and spraying 0.4g-0.5 g;
(6) and (3) drying: drying in a (60 +/-2) DEG C oven for 0.5h, taking out, and standing for 2h under standard test conditions;
(7) flushing: the test plate was placed on the test plate rack of the washing apparatus, and the valve of the washing apparatus filled with 15L of water was opened to the maximum to wash the coated test plate. Continuously moving the coating test plate during washing to enable water flow to uniformly wash each part, closing a valve after washing for 1min, and placing the coating test plate under standard test conditions until the next day, wherein the cycle is one cycle, and the whole cycle is 24 hours;
(8) and a second circulation: repeating the step (3) to the step (7);
(9) final reflectance measurement: using a reflectivity meter to take a plurality of points from the middle-lower three positions on the test plate to test the final reflection coefficient, and taking an average value B;
(10) and (3) calculating: the stain resistance of the outer wall coating is as follows: and X is | A-B |/A100%, the arithmetic mean value of three test plates is obtained, 2-bit effective value is reserved, and the relative error of the parallel measurement of the three test plates is not more than 15%.
Example 2
(1) Preparing and maintaining a test plate: preparing and maintaining test plates for the coating to be tested according to the regulations in GB/T9780-;
(2) initial reflectance measurement: using a reflectivity meter to take a plurality of points from the middle-lower three positions on a test plate to test the initial reflection coefficient, and taking an average value A;
(3) preparing a pollution source: weighing a proper amount of test ash standard sample, wherein the mass ratio of the test ash standard sample to water is 1:1, and fully and uniformly stirring to prepare a suspension;
(4) brushing: uniformly brushing the pollution source suspension liquid on the surface of the coating test plate by using a soft brush in 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: drying in an oven at 60 + -2 deg.C for 0.5 hr, and taking out;
(6) flushing: the test plate was placed on the test plate rack of the washing apparatus, and the valve of the washing apparatus filled with 15L of water was opened to the maximum to wash the coated test plate. Continuously moving the coating test plate during washing to enable water flow to uniformly wash each part, closing a valve after washing for 1min, and placing the coating test plate under standard test conditions until the next day, wherein the cycle is one cycle, and the whole cycle is 24 hours;
(7) and a second circulation: repeating the step (3) to the step (7);
(8) final reflectance measurement: using a reflectivity meter to take a plurality of points from the middle-lower three positions on the test plate to test the final reflection coefficient, and taking an average value B;
(9) and (3) calculating: the stain resistance of the outer wall coating is as follows: x is | A-B |/A100%, the result is the arithmetic mean value of three test plates, 2-bit effective value is kept, and the relative error of the parallel determination of the three test plates is not more than 15%.
Example 3
(1) Preparing and maintaining a test plate: preparing and maintaining a test board for the coating to be tested according to the regulations in GB/T9780-;
(2) initial reflectance measurement: using a reflectivity meter to take a plurality of points from the middle-lower three positions on a test plate to test the initial reflection coefficient, and taking an average value A;
(3) preparing a pollution source: weighing a proper amount of test ash standard sample, wherein the mass ratio of the test ash standard sample to water is 1:1, and fully and uniformly stirring to prepare a suspension;
(4) dip coating: the contamination source suspension was poured into a flat bottom tray. The coating was placed face down, horizontally in a pan and immersed for 5s and then removed with the coating face up.
(5) And (3) drying: drying in an oven at 60 + -2 deg.C for 0.5 hr, and taking out;
(6) flushing: the test plate was placed on the test plate rack of the washing apparatus, and the valve of the washing apparatus filled with 15L of water was opened to the maximum to wash the coated test plate. Continuously moving the coating test plate during washing to enable water flow to uniformly wash each part, closing a valve after washing for 1min, and placing the coating test plate under standard test conditions until the next day, wherein the cycle is one cycle, and the whole cycle is 24 hours;
(7) and a second circulation: repeating steps (3) - (7);
(8) final reflectance measurement: using a reflectivity meter to take a plurality of points from the middle-lower three positions on the test plate to test the final reflection coefficient, and taking an average value B;
(9) and (3) calculating: the stain resistance of the outer wall coating is as follows: x is | A-B |/A100%, the result is the arithmetic mean value of three test plates, 2-bit effective value is kept, and the relative error of the parallel determination of the three test plates is not more than 15%.
The data comparison results are shown in tables 1, 2 and 3:
table 1: example 1, example 2, example 3 the results of stain resistance performance were compared;
table 2: the reflection coefficient test value ranges of the coatings of example 1, example 2 and example 3 after the contamination test;
table 3: example 1, example 2, example 3 test procedure data comparison.
Note: A. b, X,
Respectively represents the initial average reflection coefficient of the coating, the average reflection coefficient of the coating after contamination test, the reduction rate of the reflection coefficient of the coating and the average reduction rate of the reflection coefficient of the coating, and the unit is percent. Bmax and Bmin represent the maximum reflection coefficient and the minimum reflection coefficient respectively occurring in the final reflection coefficient point-taking test process, and the unit is%.
Examples 1-3 stain resistance during the test, it can be seen from Table 3 that the degree of uniformity of the stain source application is (from easy → difficult): example 1 > example 2 > example 3, and the uniformity of the panel effect after the whole test is in turn: example 1 > example 3 ≈ example 2, which shows that the process is well suited for the stain resistance test of hydrophobic paint films, easier application, and very uniform plate surface effect of the test, the size of the range of the reflectance coefficient test results is known from table 2: example 2 ≈ example 3 > example 1, which means that the method of the present invention has smaller numerical value fluctuation and smaller error in the reflectance coefficient point-taking test process, and can give an accurate and stable determination result.
In the process of implementing the contamination resistance test of 1 to 3, as can be seen from table 3, the consumption of fly ash is in turn: example 3 > example 2 > example 1, demonstrating that the method of the present invention can greatly reduce the consumption of fly ash and waste.
It can be seen from the comparison of the results of the stain resistance tests (table 1) of the architectural coating obtained in examples 1-3 that the reduction rate of the reflection coefficient of the coating obtained by the method for applying the pollution source of the present invention is similar to the results of the dip coating test, and is inferior to the results of the brush coating test, because the two coating methods rely on the adsorption force of the coating itself to the fly ash to generate natural adsorption, rather than forced coating, and avoid the fly ash falling off caused by the second cycle of brush coating, so that the reduction rate of the reflection coefficient obtained by the method for detecting the present invention is similar to the results of the dip coating test in GB/T9780-2013 "the method for testing the stain resistance of architectural coating", and the feasibility and the scientificity of the method are well demonstrated.
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 attributes 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (9)
1. A stain resistance test method suitable for a hydrophobic coating is characterized by comprising the following steps:
(1) preparing and maintaining a test plate: preparing and maintaining a test plate for the coating to be tested according to the regulations in GB/T9780-;
(2) initial reflectance measurement: using a reflectivity meter to take a plurality of points from the middle position to the lower position on a test plate to test the initial reflection coefficient, and taking an average value A;
(3) first spraying: placing the test plate on a scale pan, resetting, spraying fog water to the upper space of the test plate by using a high-pressure spray bottle, enabling the fog water to freely fall on the surface of the test plate to moisten the test plate, and spraying 0.4g-0.5 g;
(4) ash spreading: the national standard fly ash sample tank sleeved with the filter screen is inverted, a filling opening is made to face downwards, the edge of the filling opening is lightly knocked by a rod-shaped object, so that the fly ash is uniformly sprinkled on the surface of a test board and is adsorbed and wetted by small water drops on the surface of the test board, and the mass of the fly ash is 0.5g-0.6 g;
(5) and (3) second spraying: spraying fog water to the upper space of the test board by using a high-pressure spray bottle, so that the fog water freely falls on the surface of the test board to completely wet the fly ash on the surface of the test board, and spraying 0.4g-0.5 g;
(6) and (3) drying: drying in 60 + -2 oven for 0.5h, taking out, and standing under standard test conditions (23 + -2 deg.C, relative humidity 50% + -5%) for 2 h; (ii) a
(7) Flushing: the test panel was placed on the test panel rack of the washing apparatus, and the valve of the washing apparatus filled with 15L of water was opened to the maximum to wash the coated test panel. Continuously moving the coating test plate during washing to enable water flow to uniformly wash each part, closing a valve after washing for 1min, and placing the coating test plate under standard test conditions until the next day, wherein the cycle is one cycle, and the whole cycle is 24 hours;
(8) and a second circulation: repeating the step (3) to the step (7);
(9) final reflectance measurement: using a reflectivity meter to take a plurality of points from the middle position to the lower position on the test plate to test the final reflection coefficient, and taking an average value B;
(10) and (3) calculating: the stain resistance of the outer wall coating is as follows: and X is | A-B |/A100%, the arithmetic mean value of three test plates is obtained, 2-bit effective value is kept, and the relative error of the parallel measurement of the three test plates is not more than 15%.
2. The stain resistance test method for hydrophobic coatings according to claim 1, characterized in that the coating to be tested in step (1) can be a coating having a specific hydrophobic function.
3. The stain resistance test method for hydrophobic coatings according to claim 1, wherein the precision of the electronic balance in step (3), (4) and (5) is 0.01g, and the area of the scale pan support area is less than or equal to the area of the test panel.
4. The stain resistance test method for hydrophobic coatings according to claim 1, wherein the high pressure spray bottle in step (3) and step (5) has a capacity of 200ml to 400ml, and can press the ultrafine atomized high pressure spray bottle which can continuously and uniformly discharge water for more than 3 seconds.
5. The method for testing stain resistance of a hydrophobic coating according to claim 1, wherein the spraying direction of the high pressure spray bottle in the steps (3) and (5) is 0-45 degrees from the upward direction of the test board, the horizontal height of the spray head is higher than the surface height of the test board, and the horizontal distance from the spray head to the test board is that most of the atomized water drops can drop on the surface of the test board.
6. The method for testing stain resistance of hydrophobic coating as claimed in claim 1, wherein the fly ash tank opening in step (4) is covered with one or more layers of filter screens, the filter screens are kept dry before use, the filter screens are any one or more of textile fiber filter screens or hardware filter screens, and the mesh number of the filter screens is 100-180 meshes.
7. The method for testing stain resistance of the hydrophobic coating according to claim 1, wherein the filter screen at the opening of the fly ash tank in the step (4) is fixed by a strip-shaped object or a hollow cover which is arranged around the filter screen, the fixed object can be 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 not to be loosened and fall off when being knocked.
8. The stain resistance test method for hydrophobic coatings according to claim 1, wherein the rod in step (4) is any one of a glass rod, a wood rod and an iron rod.
9. The stain resistance test method for hydrophobic coatings according to claim 1, wherein the ash scattering direction in step (4) is: firstly, the mixture is transversely scattered along the long edge direction and then is vertically scattered along the short edge direction.
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