A test method for rain marks on exterior wall real stone paint

Abstract

The present invention relates to the technical field of quality detection of real stone paint, and specifically to a method for testing rain marks of real stone paint for exterior walls. It comprises the following steps: applying a putty layer on the wall, after curing the putty, rolling a primer, and fixing the primer layer laterally with 8-12mm dividing strips at intervals of 23-27cm in the longitudinal direction, so that the test area is divided into several horizontal grids; spraying the real stone paint sample to be tested on the primer of the horizontal grid to obtain the real stone paint film sample; wetting the real stone paint film sample to ensure that its surface is moist; a drain pipe is provided on the upper side of the wall, and a drain hole is provided on the drain pipe, so that the water in the drain pipe flows down from the top of the wall through the drain hole; after the surface water of the real stone paint film sample evaporates, the grade is determined. The present invention can arbitrarily perform low-cost and scientific detection on any kind of exterior wall real stone paint as needed, and quickly evaluate the rain mark resistance performance of the exterior wall real stone paint.

Description

Technical Field

[0001] The invention relates to the technical field of real stone paint quality detection, and in particular to a method for testing rain marks on exterior wall real stone paint. Background Art

[0002] Real stone paint is a kind of imitation stone paint made of various natural colored sands, emulsions for architectural paints and a variety of additives. Its decorative effect is very similar to marble and granite. It has the characteristics of acid and alkali resistance, pollution resistance, fire resistance, waterproofness, environmental protection, strong adhesion, and light fading. It is also easy to construct, easy to dry and time-saving. It has been rapidly developed and applied in my country and has become one of the leading coating materials in the exterior wall painting and decoration of my country's buildings.

[0003] There are many problems with real stone paint during its use. Rain marks are a common paint problem during exterior wall decoration. It has become a typical industry difficulty. In the early stage of real stone paint construction, the paint film is not fully formed. When encountering light rain or showers, the local wall surface is subjected to long-term rain showers. The hydrophilic emulsifier, wetting dispersant, and water-soluble organic matter in the paint film migrate and precipitate with the water flow, destroying or changing the color of the water-sprayed area of ​​the paint film, forming water-like marks. This phenomenon is called rain marks.

[0004] Rain marks are an essential testing indicator in the development of exterior wall real stone paint, but there is currently no unified method or standard at home and abroad to specify the performance of rain marks on exterior wall real stone paint. Even if the exterior wall real stone paint passes the national standard or industry standard test, if the rain marks are more serious in the early stage of construction, it will also cause customer complaints, affect the company's reputation, and cause losses to the company; the company cannot conduct rapid testing according to feasible methods or standards.

[0005] The patent with publication number CN202011088053.5 discloses a method for testing bright spots and rain marks on exterior wall flat paint, but there are large differences between topcoat and real stone paint in terms of hardness, so this method cannot be universal. It uses a baking method, which produces a large error in the test results. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a simple testing method for rain marks of exterior wall real stone paint, which can perform low-cost and scientific testing on any exterior wall real stone paint as needed, and quickly evaluate the rain mark resistance performance of the exterior wall real stone paint.

[0008] (II) Technical solution

[0009] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0010] The present invention provides a method for testing rain marks on exterior wall real stone paint, which comprises the following steps:

[0011] S1: Apply a putty layer on the wall, roll a primer after curing the putty layer, and after the primer is dry, use 8-12 mm dividing strips to fix the primer layer horizontally at intervals of 23-27 cm in the longitudinal direction, so that the primer is divided into several horizontal grids; spray the real stone paint sample to be tested on the primer in the horizontal grids to obtain the real stone paint film sample;

[0012] S2 wet the real stone paint film sample to ensure that its surface is moist;

[0013] S3: a drain pipe is arranged on the upper side of the wall, and a drain hole is arranged on the drain pipe, so that water in the drain pipe flows down from the top of the wall through the drain hole;

[0014] S4 After the surface moisture of the real stone paint film sample evaporates, determine the grade.

[0015] In the scheme of the present invention, the paint film formed by the real stone paint film sample is divided into several horizontal grids, and the paint film is divided into several discontinuous paint films. When the water flows from top to bottom, the hydrophilic substances inside the paint film can be concentrated to the edge of the paint film dividing line under the action of the water flow, and under the action of the liquid-solid interfacial tension, the hydrophilic substances are separated from the water flow at the edge of the dividing line, and adsorbed and gathered on the paint film in the dividing line area. This method can facilitate the observation of the changes in rain marks produced by water flowing down the paint film formed by the real stone paint to be tested at different distances where the water flows. Among them, the dividing strip can be a transparent wide tape. Preferably, a guide is provided at the drainage hole so that water can flow evenly from the top of the wall to each horizontal grid. Drain holes are preferably provided on the drainage pipe at intervals of 25 to 35 cm.

[0016] The height of the wall is preferably above 150 cm.

[0017] In order to better achieve grade evaluation, in the optional scheme of the test method for rain marks of exterior wall real stone paint of the present invention, the grade evaluation criteria include 5 levels, namely:

[0018] Level 0: Visually judged rain mark level is no visible rain mark level, color difference change level is 0≤ΔE<0.2;

[0019] Level 1: Visually judged rain marks are only very slight and visible, and the color difference change level is 0.2≤ΔE<0.5;

[0020] Level 2: Visually judged rain marks are slightly visible; color difference change level is 0.5≤ΔE<1.0;

[0021] Level 3: Visually judged rain marks are relatively obvious; color difference change level is 1.0≤ΔE<3.0;

[0022] Level 4: Visually judged rain marks are visible and obvious; color difference change level is 3.0≤ΔE;

[0023] Among them, levels 0 to 2 are qualified, and levels 3 to 4 are unqualified.

[0024] The color difference change level is determined by visual judgment of color change and instrument testing, and the instrument testing is preferably NH310 portable colorimeter.

[0025] Among them, in the scheme of the present invention, the rain mark level is judged by combining visual judgment of the rain mark level and the color difference change level, wherein both the visual judgment of the rain mark level and the color difference change level judgment are necessary.

[0026] In order to better complete the test, in an optional scheme of the test method for rain marks of exterior wall real stone paint of the present invention, the putty layer includes a fine sub-layer and a coarse putty layer from bottom to top.

[0027] Preferably, the thickness of the coarse putty layer is 1 to 2 mm, and the thickness of the fine putty layer is 0.5 to 1.5 mm.

[0028] In an optional scheme of the test method for rain marks of exterior wall real stone paint of the present invention, after applying the putty layer, drying and curing for 7 to 11 days;

[0029] or / and

[0030] Primer coating rate is controlled at 0.12~0.15kg / m 2 , after applying the primer, dry and cure for 4 to 7 hours under rainless conditions;

[0031] or / and

[0032] After applying the real stone paint sample to be tested, dry and cure for 1 to 5 days.

[0033] Among them, after applying the real stone paint sample to be tested, it is dried and cured for 1 to 5 days; this can meet the quality requirements of the real stone paint for being resistant to rain marks, which are easy to be produced in the initial stage of construction.

[0034] In the optional scheme of the test method for rain marks of exterior wall real stone paint of the present invention, the coating rate of the real stone paint sample to be tested is controlled at 3.0-4.0 kg / m 2 The higher the coating rate, the easier it is to produce rain marks. The present invention preferably uses the highest coating rate of real stone paint during construction, or preferably uses a coating rate slightly higher than the highest coating rate during construction.

[0035] In the optional scheme of the test method for rain marks of exterior stone paint of the present invention, the air pressure of the tested stone paint sample is 4-6kpa, the spray gun muzzle is 30-50cm away from the construction wall, and the surface is evenly sprayed according to the cross-gun method. The spraying air pressure and distance will affect the adhesion of the stone paint, thereby affecting

[0036] In the optional scheme of the test method for rain marks of real stone paint on exterior walls of the present invention, the water flow rate of the drainage hole is 4-5L / h, and the water flow time is 4-6h. The flow rate of the drainage hole is one of the key points for generating rain marks. If the water flow rate is too fast or too slow, it is not easy to generate rain marks on the surface of the real stone paint film. In this application, the water volume is preferably 4-5L / h as the standard water flow volume for evaluating the paint film.

[0037] In an optional scheme of the test method for rain marks of exterior wall real stone paint of the present invention, in steps S1-S7, the air humidity is controlled at 65% to 85%, the temperature is 10 to 20°C, and the moisture content of the wall is above 10%. The accuracy of the test results can be guaranteed only when the environment of the test method of the present invention is controlled within the above parameter range.

[0038] In the optional scheme of the test method for rain marks of real stone paint on exterior walls of the present invention, the area of ​​the wall is 1 to 6 m 2 .

[0039] (III) Beneficial effects

[0040] The beneficial effects of the present invention are:

[0041] The test method for rain marks on exterior wall real stone paint of the present invention is simple and convenient to operate, can efficiently evaluate the rain mark performance of real stone paint products, improve the comprehensiveness of product testing, and more easily provide guidance to technicians to optimize formulas and predict product performance, thereby reducing the risk of product customer complaints and reducing company losses. The method of the present invention can be directly used for laboratory and outdoor wall testing, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of rain mark test of real stone paint film samples of Examples 1-6 of the present invention;

[0043] Reference numerals:

[0044] 1-drain pipe; 2-small hole; 3-sealed pipe mouth; 4-wide tape; 5-horizontal grid; 6-water flow area; 7-wall. DETAILED DESCRIPTION

[0045] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods.

[0046] The test method for bright spot rain marks of exterior wall flat coating proposed in the embodiment of the present invention divides the wall into several horizontal grids, which is convenient for evaluating the different degrees of rain marks caused by rainwater flowing on the wall, thereby better evaluating the rain mark resistance quality of real stone paint.

[0047] The specific method is:

[0048] S1: Apply a putty layer on the wall, roll a primer after curing the putty, and after the primer is dry, use 8-12 mm dividing strips to fix the primer layer horizontally at intervals of 23-27 cm in the longitudinal direction, so that the primer is divided into several horizontal grids; spray the real stone paint sample to be tested on the primer in the horizontal grids to obtain the real stone paint film sample;

[0049] S2 wet the real stone paint film sample to ensure that its surface is moist;

[0050] S3: a drain pipe is arranged on the upper side of the wall, and a drain hole is arranged on the drain pipe, so that water in the drain pipe flows down from the top of the wall through the drain hole;

[0051] S4 After the surface moisture of the real stone paint film sample evaporates, determine the grade.

[0052] In order to better understand the above technical scheme, exemplary embodiments of the present invention will be described in more detail below. Although exemplary embodiments of the present invention are shown below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a clearer and thorough understanding of the present invention, and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0053] Example 1

[0054] like Figure 1 Shown: The test method for testing rain marks on real stone paint, the specific steps are:

[0055] S1 putty layer: select 2m 2 External wall 7 (180cm×111cm), a layer of external wall anti-cracking rough base putty is applied on the external wall 7 to obtain a rough putty layer, the thickness of the rough putty layer is 2mm, and it is dried and cured for 2 days; then a layer of external wall engineering fine base putty is applied to obtain a fine sub-layer, the thickness of the fine sub-layer is 1mm, and it is dried and cured for 7 days;

[0056] S2 wall segmentation: Roll and apply a layer of textured stone paint primer evenly on the delicate sub-layer, with a coating rate of 0.12kg / m 2 , after rolling, dry and cure for 6 hours under rainless conditions; after the primer is dry, use 10mm wide tape 4 to fix the primer horizontally on the wall 7 at every 25cm interval to obtain several horizontal grids 5, where the primer rolling construction tool is a 4-inch short wool little finger roller core roller, and bubbles must be prevented during the primer rolling process to ensure the accuracy of the test;

[0057] S3 spraying the real stone paint sample to be tested: Use a special spray gun for architectural paint with a muzzle diameter of 6mm to spray on the primer, control the spraying air pressure to 6kpa, keep the muzzle of the spray gun 50cm away from the construction wall, and spray the real stone paint sample to be tested evenly using the cross-gun method, and control the coating amount to 3.5kg / m 2 , dried and cured for 2 days to obtain a real stone paint film sample;

[0058] S4 wets the real stone paint film sample over a large area to ensure that the surface of the real stone paint film sample is moist;

[0059] S5 test: Take a PVC drainage pipe 1 longer than 2 meters and hang it on the upper end of the real stone paint film sample wall 7. One end of the PVC drainage pipe 1 is connected to the faucet, and the other end is a sealed pipe mouth 3. Small holes 2 are opened every 30 cm in the water pipe, and the small holes 2 are close to the surface of the real stone paint film sample to be tested. The water flow rate of the small holes 2 is adjusted to ensure 5L / h, so that the water flows from the top of the wall 7 in the form of penetration, through each horizontal grid 5 to the lower end of the outer wall (water flow area 6). The water flow test time is 4h; after the moisture on the surface of the real stone paint film sample evaporates and dries, visually judge the rain mark level and the color change level at the rain mark, and use a colorimeter for numerical testing. The colorimeter is the NH310 portable colorimeter of 3nh Company;

[0060] In steps S1-S5, the air humidity is controlled at 65% to 85%, the temperature range is 15 to 20°C, and the moisture content of the wall 7 is 10%.

[0061] The evaluation criteria for grades include 5 levels, namely:

[0062] Level 0: Visually judged rain mark level is no visible rain mark level, color difference change level is 0≤ΔE<0.2;

[0063] Level 1: Visually judged rain marks are only very slight and visible, and the color difference change level is 0.2≤ΔE<0.5;

[0064] Level 2: Visually judged rain marks are slightly visible; color difference change level is 0.5≤ΔE<1.0;

[0065] Level 3: Visually judged rain marks are relatively obvious; color difference change level is 1.0≤ΔE<3.0;

[0066] Level 4: Visually judged rain marks are visible and obvious; color difference change level is 3.0≤ΔE;

[0067] Among them, levels 0 to 2 are qualified, and levels 3 to 4 are unqualified.

[0068] Among them, the color difference change level is tested by visual inspection and NH310 portable colorimeter.

[0069] Example 2

[0070] like Figure 1 Shown: The test method for testing rain marks on real stone paint, the specific steps are:

[0071] S1 putty layer: select 4m 2 External wall 7 (250cm×160cm), a layer of external wall anti-cracking rough base putty is applied on the external wall 7 to obtain a rough putty layer, the thickness of the rough putty layer is 1mm, and it is dried and cured for 3 days; then a layer of external wall engineering fine base putty is applied to obtain a fine sub-layer, the thickness of the fine sub-layer is 1.5mm, and it is dried and cured for 6 days;

[0072] S2 wall segmentation: Roll and apply a layer of textured stone paint primer evenly on the delicate sub-layer, with a coating rate of 0.15kg / m 2 After rolling, dry and cure for 7 hours under rainless conditions. After the primer is dry, use 12mm wide tape 4 to fix the primer horizontally on the wall 7 at every 27cm interval to obtain several horizontal grids 5. The primer rolling construction tool is a 4-inch short wool little finger roller. During the primer rolling process, bubbles must be prevented from being generated to ensure the accuracy of the test.

[0073] S3 spraying the real stone paint sample to be tested: Use a special spray gun for architectural paint with a muzzle diameter of 6mm to spray on the primer, control the spraying air pressure to 4kpa, keep the muzzle of the spray gun 40cm away from the construction wall, and spray the light yellow real stone paint sample to be tested evenly using the cross-gun method, and control the coating amount to 3.0kg / m 2 , dried and cured for 3 days to obtain a real stone paint film sample;

[0074] S4 wets the real stone paint film sample over a large area to ensure that the surface of the real stone paint film sample is moist;

[0075] S5 test: take a PVC drainage pipe 1 longer than 2 meters and hang it on the upper end of the real stone paint film sample wall 7. One end of the PVC drainage pipe 1 is connected to the faucet, and the other end is a sealed pipe mouth 3. Small holes 2 are opened in the water pipe every 25 cm, and the small holes 2 are close to the surface of the real stone paint film sample to be tested. The water flow rate of the small holes 2 is adjusted to ensure that it is 4L / h, so that the water flows down from the top of the wall 7 in the form of infiltration, passes through each horizontal grid 5 to the lower end of the outer wall (water flow area 6), and the water flow test time is 5h; after the moisture on the surface of the real stone paint film sample evaporates and dries, the rain mark level and the color change level at the rain mark are visually judged, and a colorimeter is used for numerical testing. The colorimeter is the NH310 portable colorimeter of 3nh.

[0076] In steps S1-S5, the air humidity is controlled at 65% to 85%, the temperature range is 10 to 15°C, and the moisture content of the wall 7 is 20%.

[0077] The evaluation criteria for grades include 5 levels, namely:

[0078] Level 0: Visually judged rain mark level is no visible rain mark level, color difference change level is 0≤ΔE<0.2;

[0079] Level 1: Visually judged rain marks are only very slight and visible, and the color difference change level is 0.2≤ΔE<0.5;

[0080] Level 2: Visually judged rain marks are slightly visible; color difference change level is 0.5≤ΔE<1.0;

[0081] Level 3: Visually judged rain marks are relatively obvious; color difference change level is 1.0≤ΔE<3.0;

[0082] Level 4: Visually judged rain marks are visible and obvious; color difference change level is 3.0≤ΔE;

[0083] Among them, levels 0 to 2 are qualified, and levels 3 to 4 are unqualified.

[0084] Among them, the color difference change level is tested by visual inspection and NH310 portable colorimeter.

[0085] Example 3

[0086] like Figure 1 Shown: The test method for testing rain marks on real stone paint, the specific steps are:

[0087] S1 putty layer: select 6m 2 External wall 7 (300cm×201cm), a layer of external wall anti-cracking rough base putty is applied on the external wall 7 to obtain a rough putty layer, the thickness of the rough putty layer is 1mm, and it is dried and cured for 1 day; then a layer of external wall engineering fine base putty is applied to obtain a fine sub-layer, the thickness of the fine sub-layer is 0.5mm, and it is dried and cured for 8 days;

[0088] S2 wall segmentation: Roll and apply a layer of textured stone paint primer evenly on the delicate sub-layer, with a coating rate of 0.12kg / m 2 , after rolling, dry and cure for 4 hours under rainless conditions; after the primer is dry, use 8mm wide tape 4 to fix the primer horizontally on the wall 7 at intervals of 23cm in the longitudinal direction to obtain several horizontal grids 5, where the primer rolling construction tool is a 4-inch short wool little finger roller core roller. During the primer rolling process, bubbles must be prevented from being generated to ensure the accuracy of the test;

[0089] S3 spraying the real stone paint sample to be tested: use a 6mm muzzle caliber spray gun for architectural coatings to spray on the primer, control the spraying air pressure to 5kpa, keep the spray gun muzzle 40cm away from the construction wall, and spray the real stone paint sample to be tested evenly using the cross-gun method, and control the coating amount to 4.0kg / m2 , dried and cured for 4 days to obtain a real stone paint film sample;

[0090] S4 wets the real stone paint film sample over a large area to ensure that the surface of the real stone paint film sample is moist;

[0091] S5 test: take a PVC drainage pipe 1 longer than 2 meters and hang it on the upper end of the real stone paint film sample wall 7. One end of the PVC drainage pipe 1 is connected to the faucet, and the other end is a sealed pipe mouth 3. Small holes 2 are opened in the water pipe every 35 cm, and the small holes 2 are close to the surface of the real stone paint film sample to be tested. The water flow rate of the small holes 2 is adjusted to ensure that it is 4.5L / h, so that the water flows down from the top of the wall 7 in the form of infiltration, passes through each horizontal grid 5 to the lower end of the outer wall (water flow area 6), and the water flow test time is 6h; after the moisture on the surface of the real stone paint film sample evaporates and dries, visually judge the rain mark level and the color change level at the rain mark, and use a colorimeter for numerical testing. The colorimeter is the NH310 portable colorimeter from 3nh.

[0092] In steps S1-S5, the air humidity is controlled at 65% to 85%, the temperature range is 10 to 20°C, and the moisture content of the wall 7 is 25%.

[0093] The evaluation criteria for grades include 5 levels, namely:

[0094] Level 0: Visually judged rain mark level is no visible rain mark level, color difference change level is 0≤ΔE<0.2;

[0095] Level 1: Visually judged rain marks are only very slight and visible, and the color difference change level is 0.2≤ΔE<0.5;

[0096] Level 2: Visually judged rain marks are slightly visible; color difference change level is 0.5≤ΔE<1.0;

[0097] Level 3: Visually judged rain marks are relatively obvious; color difference change level is 1.0≤ΔE<3.0;

[0098] Level 4: Visually judged rain marks are visible and obvious; color difference change level is 3.0≤ΔE;

[0099] Among them, levels 0 to 2 are qualified, and levels 3 to 4 are unqualified.

[0100] Among them, the color difference change level is tested by visual inspection and NH310 portable colorimeter.

[0101] Example 4

[0102] like Figure 1 Shown: The test method for testing rain marks on real stone paint, the specific steps are:

[0103] S1 putty layer: select 3m 2 External wall 7 (200cm×150cm), a layer of external wall anti-cracking rough base putty is applied on the external wall 7 to obtain a rough putty layer, the thickness of the rough putty layer is 2mm, and it is dried and cured for 3 days; then a layer of external wall engineering fine base putty is applied to obtain a fine sub-layer, the thickness of the fine sub-layer is 1.5mm, and it is dried and cured for 6 to 8 days;

[0104] S2 wall segmentation: Roll and apply a layer of textured stone paint primer evenly on the delicate sub-layer, with a coating rate of 0.13kg / m 2 , after rolling, dry and cure for 5 hours under rainless conditions; after the primer is dry, use 11mm wide tape 4 to fix the primer horizontally on the wall 7 at intervals of 24cm in the longitudinal direction to obtain several horizontal grids 5, where the primer rolling construction tool is a 4-inch short wool little finger roller core roller. During the primer rolling process, bubbles must be prevented from being generated to ensure the accuracy of the test;

[0105] S3 spraying the real stone paint sample to be tested: Use a special spray gun for architectural paint with a muzzle diameter of 6mm to spray on the primer, control the spraying air pressure to 6kpa, keep the muzzle of the spray gun 30cm away from the construction wall, and spray the light yellow real stone paint sample to be tested evenly using the cross-gun method, and control the coating amount to 3.0kg / m 2 , drying and curing for 1 day to obtain a real stone paint film sample;

[0106] S4 wets the real stone paint film sample over a large area to ensure that the surface of the real stone paint film sample is moist;

[0107] S5 test: take a PVC drainage pipe 1 longer than 2 meters and hang it on the upper end of the real stone paint film sample wall 7. One end of the PVC drainage pipe 1 is connected to the faucet, and the other end is a sealed pipe mouth 3. Small holes 2 are opened in the water pipe every 29 cm, and the small holes 2 are close to the surface of the real stone paint film sample to be tested. The water flow rate of the small holes 2 is adjusted to ensure that it is 5L / h, so that the water flows down from the top of the wall 7 in the form of infiltration, passes through each horizontal grid 5 to the lower end of the outer wall (water flow area 6), and the water flow test time is 4h; after the moisture on the surface of the real stone paint film sample evaporates and dries, visually judge the rain mark level and the color change level at the rain mark, and use a colorimeter for numerical testing. The colorimeter is the NH310 portable colorimeter of 3nh.

[0108] In steps S1-S5, the air humidity is controlled at 65% to 85%, the temperature range is 10 to 20°C, and the moisture content of the wall 7 is 10%.

[0109] The evaluation criteria for grades include 5 levels, namely:

[0110] Level 0: Visually judged rain mark level is no visible rain mark level, color difference change level is 0≤ΔE<0.2;

[0111] Level 1: Visually judged rain marks are only very slight and visible, and the color difference change level is 0.2≤ΔE<0.5;

[0112] Level 2: Visually judged rain marks are slightly visible; color difference change level is 0.5≤ΔE<1.0;

[0113] Level 3: Visually judged rain marks are relatively obvious; color difference change level is 1.0≤ΔE<3.0;

[0114] Level 4: Visually judged rain marks are visible and obvious; color difference change level is 3.0≤ΔE;

[0115] Among them, levels 0 to 2 are qualified, and levels 3 to 4 are unqualified.

[0116] Among them, the color difference change level is tested by visual inspection and NH310 portable colorimeter.

[0117] Example 5

[0118] like Figure 1 Shown: The test method for testing rain marks on real stone paint, the specific steps are:

[0119] S1 putty layer: select 5m 2 External wall 7 (260cm×192cm), a layer of external wall anti-cracking rough base putty is applied on the external wall 7 to obtain a rough putty layer, the thickness of the rough putty layer is 2mm, and it is dried and cured for 1 day; then a layer of external wall engineering fine base putty is applied to obtain a fine sub-layer, the thickness of the fine sub-layer is 1mm, and it is dried and cured for 7 days;

[0120] S2 wall segmentation: Roll and apply a layer of textured stone paint primer evenly on the delicate sub-layer, with a coating rate of 0.12kg / m 2 , after rolling, dry and cure for 4 hours under rainless conditions; after the primer is dry, use 9mm wide tape 4 to fix the primer horizontally on the wall 7 at intervals of 26cm in the longitudinal direction to obtain several horizontal grids 5, where the primer rolling construction tool is a 4-inch short wool little finger roller core roller. During the primer rolling process, bubbles must be prevented from being generated to ensure the accuracy of the test;

[0121] S3 spraying the real stone paint sample to be tested: Use a 6mm muzzle caliber spray gun for architectural coatings to spray on the primer, control the spraying air pressure to 4kpa, keep the spray gun muzzle 50cm away from the construction wall, and spray the real stone paint sample to be tested evenly using the cross-gun method, with the coating amount controlled at 3.8kg / m 2 , drying and curing for 5 days to obtain a real stone paint film sample;

[0122] S4 wets the real stone paint film sample over a large area to ensure that the surface of the real stone paint film sample is moist;

[0123] S5 test: take a PVC drainage pipe 1 longer than 2 meters and hang it on the upper end of the real stone paint film sample wall 7. One end of the PVC drainage pipe 1 is connected to the faucet, and the other end is a sealed pipe mouth 3. Small holes 2 are opened in the water pipe every 33 cm, and the small holes 2 are made close to the surface of the real stone paint film sample to be tested. The water flow rate of the small holes 2 is adjusted to ensure that it is 4L / h, so that the water flows down from the top of the wall 7 in the form of infiltration, passes through each horizontal grid 5 to the lower end of the outer wall (water flow area 6), and the water flow test time is 5h; after the moisture on the surface of the real stone paint film sample evaporates and dries, visually judge the rain mark level and the color change level at the rain mark, and use a colorimeter for numerical testing. The colorimeter is the NH310 portable colorimeter from 3nh.

[0124] In steps S1-S5, the air humidity is controlled at 65% to 85%, the temperature range is 10 to 20°C, and the moisture content of the wall is 15%.

[0125] The evaluation criteria for grades include 5 levels, namely:

[0126] Level 0: Visually judged rain mark level is no visible rain mark level, color difference change level is 0≤ΔE<0.2;

[0127] Level 1: Visually judged rain marks are only very slight and visible, and the color difference change level is 0.2≤ΔE<0.5;

[0128] Level 2: Visually judged rain marks are slightly visible; color difference change level is 0.5≤ΔE<1.0;

[0129] Level 3: Visually judged rain marks are relatively obvious; color difference change level is 1.0≤ΔE<3.0;

[0130] Level 4: Visually judged rain marks are visible and obvious; color difference change level is 3.0≤ΔE;

[0131] Among them, levels 0 to 2 are qualified, and levels 3 to 4 are unqualified.

[0132] Among them, the color difference change level is tested by visual inspection and NH310 portable colorimeter.

[0133] Example 6

[0134] like Figure 1 Shown: The test method for testing rain marks on real stone paint, the specific steps are:

[0135] S1 putty layer: select 4m 2External wall 7 (200cm×200cm), a layer of external wall anti-cracking rough base putty is applied on the external wall 7 to obtain a rough putty layer, the thickness of the rough putty layer is 1.5mm, and it is dried and cured for 2 days; then a layer of external wall engineering fine base putty is applied to obtain a fine sub-layer, the thickness of the fine sub-layer is 1.5mm, and it is dried and cured for 8 days;

[0136] S2 wall segmentation: Roll and apply a layer of textured stone paint primer evenly on the delicate sub-layer, with a coating rate of 0.14kg / m 2 After rolling, dry and cure for 7 hours under rainless conditions. After the primer is dry, use 11mm wide tape 4 to fix the primer horizontally on the wall 7 at intervals of 27cm in the longitudinal direction to obtain several horizontal grids 5. The primer rolling construction tool is a 4-inch short wool little finger roller. During the primer rolling process, bubbles must be prevented from being generated to ensure the accuracy of the test.

[0137] S3 spraying the real stone paint sample to be tested: Use a special spray gun for architectural paint with a muzzle diameter of 6mm to spray on the primer, control the spraying air pressure to 6kpa, keep the muzzle of the spray gun 35cm away from the construction wall, and spray the light yellow real stone paint sample to be tested evenly using the cross-gun method, and control the coating amount to 4.0kg / m 2 , dried and cured for 3 days to obtain a real stone paint film sample;

[0138] S4 wets the real stone paint film sample over a large area to ensure that the surface of the real stone paint film sample is moist;

[0139] S5 test: take a PVC drainage pipe 1 longer than 2 meters and hang it on the upper end of the real stone paint film sample wall 7. One end of the PVC drainage pipe 1 is connected to the faucet, and the other end is a sealed pipe mouth 3. Small holes 2 are opened in the water pipe every 28 cm, and the small holes 2 are close to the surface of the real stone paint film sample to be tested. The water flow rate of the small holes 2 is adjusted to ensure that it is 4.3L / h, so that the water flows down from the top of the wall 7 in the form of infiltration, through each horizontal grid 5 to the lower end of the outer wall (water flow area 6). The water flow test time is 4.5h; after the moisture on the surface of the real stone paint film sample evaporates and dries, the rain mark level and the color change level at the rain mark are visually judged, and numerical tests are performed using a colorimeter and a gloss meter. The colorimeter is the NH310 portable colorimeter from 3nh.

[0140] In steps S1-S5, the air humidity is controlled at 65% to 85%, the temperature range is 12 to 18°C, and the moisture content of the wall 7 is 10%.

[0141] The evaluation criteria for grades include 5 levels, namely:

[0142] Level 0: Visually judged rain mark level is no visible rain mark level, color difference change level is 0≤ΔE<0.2;

[0143] Level 1: Visually judged rain marks are only very slight and visible, and the color difference change level is 0.2≤ΔE<0.5;

[0144] Level 2: Visually judged rain marks are slightly visible; color difference change level is 0.5≤ΔE<1.0;

[0145] Level 3: Visually judged rain marks are relatively obvious; color difference change level is 1.0≤ΔE<3.0;

[0146] Level 4: Visually judged rain marks are visible and obvious; color difference change level is 3.0≤ΔE;

[0147] Among them, levels 0 to 2 are qualified, and levels 3 to 4 are unqualified.

[0148] Among them, the color difference change level is tested by visual inspection and NH310 portable colorimeter.

[0149] The results of the rain mark performance test of different colors of real stone paint samples on different exterior walls according to Example 1 of the present invention are as follows:

[0150] Example 7: The results of the rain mark performance test of the dark red real stone paint sample on the fine sand exterior wall according to the method of Example 1 are shown in Table 1:

[0151] Table 1: Test results of Example 7

[0152]

[0153] Example 8: The results of the rain mark performance test of the light yellow real stone paint sample on the fine sand exterior wall according to the method of Example 1 are shown in Table 2:

[0154] Table 2: Test results of Example 8

[0155]

[0156] Example 9: The results of the rain mark performance test of the dark red real stone paint sample on the medium sand mold exterior wall according to the method of Example 1 are shown in Table 3:

[0157] Table 3: Test results of Example 9

[0158]

[0159] Example 10: The results of the rain mark performance test of the light yellow real stone paint sample on the medium sand exterior wall according to the method of Example 1 are shown in Table 4:

[0160] Table 4: Test results of Example 10

[0161]

[0162] Example 11: The results of the rain mark performance test of the dark red real stone paint sample on the medium sand exterior wall according to the method of Example 1 are shown in Table 5:

[0163] Table 5: Test results of Example 11

[0164]

[0165] Example 12: The results of the rain mark performance test of the light yellow real stone paint sample on the medium sand exterior wall according to the method of Example 1 are shown in Table 6:

[0166] Table 6: Test results of Example 12

[0167]

[0168] The real stone paint samples of the same color in Example 7 to Example 12 are the same kind of real stone paint samples, and the exterior walls of the same material are the same kind of exterior walls.

[0169] It can be seen from the test results of Examples 7 to 12 that the present invention can sensitively measure rain marks for real stone paint samples of various colors and different exterior walls, and the rain mark performance of real stone paint samples of the same color on different exterior walls will be different.

[0170] The selected dark red real stone paint sample has the highest grade of grade 3 on the fine sand type exterior wall, and the color difference change is only 2.02; the grade on the coarse sand type and medium sand type exterior wall is grade 4, and the color difference changes are 5.02 and 6.02 respectively. The selected light yellow real stone paint sample has the highest grade of grade 1 on the coarse sand type exterior wall, and the color difference change is only 0.60; the grade on the fine sand type and medium sand type exterior wall is grade 2, and the color difference changes are 0.51 and 0.88 respectively. By comparing the real stone paint samples of the same color on the exterior walls of different materials, they can be distinguished from the color difference change, visual color grade and visual judgment of color change grade, which improves the sensitivity and accuracy of the test results.

[0171] Among the fine sand type, medium sand type and coarse sand type exterior walls, the light yellow real stone paint sample has a higher grade and a color difference change, and the color difference change value is significantly smaller than that of the dark red real stone paint sample.

[0172] By comparing the detection of Examples 7 to 12 of the present invention with the international standard result values ​​of the adopted real stone paint samples, it can be explained that the method of Example 1 of the present invention has high sensitivity and feasibility for detecting real stone paint samples.

[0173] In addition, the results of rain mark performance tests of different colors of real stone paint samples of the present invention on different exterior walls according to the methods of Examples 2-6 are consistent with those of Examples 7-12.

[0174] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing rain marks on exterior wall real stone paint, characterized in that: It includes the following steps: S1: Apply a putty layer on the wall, roll a primer after curing the putty layer, and after the primer is dry, use 8-12 mm dividing strips to fix the primer layer horizontally at intervals of 23-27 cm in the longitudinal direction, so that the primer is divided into several horizontal grids; spray the real stone paint sample to be tested on the primer of the horizontal grid to obtain the real stone paint film sample; S2 wet the real stone paint film sample to ensure that its surface is moist; S3: a drain pipe is arranged on the upper side of the wall, and a drain hole is arranged on the drain pipe, so that water in the drain pipe flows down from the top of the wall through the drain hole; S4 After the surface moisture of the real stone paint film sample evaporates, determine the grade.

2. The method for testing rain marks on exterior wall real stone paint according to claim 1, characterized in that: The evaluation criteria for the grade include 5 levels, namely: Level 0: Visually judged rain mark level is no visible rain mark level, color difference change level is 0≤ΔE<0.2; Level 1: Visually judged rain marks are only very slight and visible, and the color difference change level is 0.2≤ΔE<0.5; Level 2: Visually judged rain marks are slightly visible; color difference change level is 0.5≤ΔE<1.0; Level 3: Visually judged rain marks are relatively obvious; color difference change level is 1.0≤ΔE<3.0; Level 4: Visually judged rain marks are visible and obvious; color difference change level is 3.0≤ΔE; Among them, levels 0 to 2 are qualified, and levels 3 to 4 are unqualified.

3. The method for testing rain marks on exterior wall real stone paint according to claim 1, characterized in that: The putty layer includes a fine sub-layer and a coarse putty layer from bottom to top.

4. The method for testing rain marks on exterior wall real stone paint as claimed in claim 3, characterized in that: The thickness of the coarse putty layer is 1 to 2 mm, and the thickness of the fine putty layer is 0.5 to 1.5 mm.

5. The method for testing rain marks on exterior wall real stone paint according to claim 1, characterized in that: After applying the putty layer, dry and cure for 7 to 11 days; or / and Primer coating rate is controlled at 0.12~0.15kg / m 2 , after applying the primer, dry and cure for 4 to 7 hours under rainless conditions; or / and After applying the real stone paint sample to be tested, dry and cure for 1 to 5 days.

6. The method for testing rain marks on exterior wall real stone paint according to claim 1, characterized in that: The coating rate of the real stone paint sample to be tested is controlled at 3.0~4.0kg / m 2 .

7. The method for testing rain marks on exterior wall real stone paint according to claim 1, characterized in that: The air pressure for spraying the real stone paint sample to be tested is 4-6kpa, the muzzle of the spray gun is 30-50cm away from the construction wall, and the surface is sprayed evenly using the cross-gun method.

8. The method for testing rain marks on exterior wall real stone paint according to claim 1, characterized in that: The water flow rate of the drainage hole is 4 to 5 L / h, and the water flow time is 4 to 6 hours.

9. The method for testing rain marks on exterior wall real stone paint according to claim 1, characterized in that: In steps S1-S7, the air humidity is controlled at 65% to 85%, the temperature is 10 to 20°C, and the moisture content of the wall is above 10%.

10. The method for testing rain marks on exterior wall real stone paint according to any one of claims 1 to 9, characterized in that: The area of ​​the wall is 1 to 6 m 2 .

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