CN111157674A - Rapid testing method for plane thick coating cracking resistance of water-based polymer wall coating material - Google Patents
Rapid testing method for plane thick coating cracking resistance of water-based polymer wall coating material Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 112
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to a rapid test method for the plane thick coating cracking resistance of a water-based polymer wall coating material. Specifically, the method can realize accurate measurement of the plane thick coating cracking resistance of the aqueous polymer wall coating material with less coating material consumption, shorter test time and lower cost without large-scale field construction, and is beneficial to research, development and screening of the aqueous polymer wall coating material.
Description
Technical Field
The invention relates to the field of coatings, in particular to a quick test method for the crack resistance of a plane thick coating of a water-based polymer wall coating material.
Background
With the development of economy and the improvement of environmental protection requirements, the water-based polymer wall coating material is used more and more. In practical use, the cracking phenomenon of the aqueous polymer wall coating material due to thick coating is also rare. In addition to external factors such as deformation and displacement of wall or substrate structure, the thick coating cracking resistance of the water-based polymer wall coating material itself becomes very important. If the water-based polymer wall coating material has good thick coating anti-cracking performance, the cracking phenomenon can be avoided to the maximum extent in use, and the risk of other paint diseases is further reduced.
At present, no detection method for the thick coating anti-cracking performance of the water-based polymer wall coating material exists in the relevant standards, and generally the test is carried out on site construction. In view of the above analysis, there is a need in the industry for a method for testing the cracking resistance of a planar thick coating of an aqueous polymer wall coating material, which is effective and fast, so as to reduce the risk of cracking.
Disclosure of Invention
The invention aims to provide a detection method capable of quickly and effectively detecting the thick-coating cracking resistance of a water-based polymer wall coating material.
In a first aspect of the present invention, there is provided a method for testing the planar thick-coat cracking resistance of an aqueous coating, comprising the steps of:
1) providing a fiber cement flat plate, an oven, a water-based paint to be detected, optional putty and optional primer matched with the water-based paint to be detected;
2) setting the temperature of the oven to a first temperature and the humidity of the oven to a first humidity;
3) coating the water-based paint to be detected on the fiber cement flat plate to obtain the fiber cement flat plate coated with the water-based paint layer;
4) placing the fiber cement flat plate coated with the water-based coating layer obtained in the step 3) in the oven of the step 2) for treatment for the first time, then taking out and observing the cracking condition of the water-based coating layer on the surface of the fiber cement flat plate, and judging the plane thick coating anti-cracking performance of the water-based coating based on the cracking condition.
In another preferred embodiment, the aqueous coating to be tested is selected from the group consisting of: water-based paint for interior walls and water-based paint for exterior walls; and/or
The putty is selected from the following groups: normal putty and loose putty.
In another preferred embodiment, the normal putty comprises the following components: talcum powder, cooked rubber powder, glue and water.
In another preferred example, the normal putty comprises the following components in parts by weight of 80-110: 0.5-2: 5-20: 15-50.
In another preferred embodiment, the bulk putty comprises the following components: talcum powder, cooked rubber powder and water.
In another preferred example, the weight ratio of the talcum powder to the cooked adhesive powder to the water in the loose putty is 80-110: 0.5-2: 35-65.
In another preferred example, when the aqueous coating to be tested is an interior wall aqueous coating, the method further comprises the following steps before the step 3):
3-1) batch-coating the putty on the fiber cement flat plate.
In another preferred embodiment, when the test method tests for flat thick-coat crack resistance at ambient temperature (20-26 ℃), the method has one or more characteristics selected from the group consisting of:
1) the water-based paint to be detected is respectively coated on 3 fiber cement flat plates, and the coating amount of the water-based paint layer is respectively a first dosage, a second dosage and a third dosage;
2) the first temperature is 15-30 ℃, preferably 20-25 ℃;
3) the first humidity is 30-70%, preferably 40-60%;
4) the first time is 12-36h, preferably 18-30 h.
In another preferred embodiment, when the test method tests for flat thick-coat crack resistance at low temperatures (0-10 ℃), the method has one or more characteristics selected from the group consisting of:
i) the first temperature is 0-10 ℃, preferably 3-8 ℃;
ii) said first humidity is between 30 and 70%, preferably between 40 and 60%;
iii) after step 3-1) and before step 3) further comprising the steps of:
3-2) placing the product obtained in the step 3-1) in the oven for a second time;
iv) in step 3), the coating treatment is carried out in an oven at the first temperature and the first humidity;
v) respectively coating the water-based paint to be detected on 3 fiber cement flat plates, wherein the coating amount of the water-based paint layer is respectively a first dosage, a second dosage and a third dosage;
vi) said first time is from 12 to 36 hours, preferably from 18 to 30 hours.
In another preferred embodiment, the second time is 0.5-4h, preferably 1-3 h.
In another preferred example, when the water-based paint to be tested is a water-based paint for an external wall, the step 3) is preceded by the following steps:
a) brushing the primer on the fiber cement flat plate to obtain a fiber cement flat plate coated with a primer layer;
b) the fiber cement slab coated with the primer layer is placed in an environment with a temperature of 15-30 ℃ (preferably 20-25 ℃) and a humidity of 30-70% (preferably 40-60%) until the primer layer is dried for 12-36h (preferably 18-30 h).
In another preferred embodiment, the brushing amount of the primer is 100-150g/m2。
In another preferred embodiment, when the test method tests for flat thick-coat crack resistance at ambient temperature (20-26 ℃), the method has one or more characteristics selected from the group consisting of:
1) the water-based paint to be detected is respectively coated on 3 fiber cement flat plates, and the coating amount of the water-based paint layer is respectively a first dosage, a second dosage and a third dosage;
2) the first temperature is 15-30 ℃, preferably 20-25 ℃;
3) the first humidity is 30-70%, preferably 40-60%;
4) the first time is 12-36h, preferably 18-30 h.
In another preferred embodiment, when the test method tests for flat thick-coat crack resistance at low temperatures (0-10 ℃), the method has one or more characteristics selected from the group consisting of:
i) the first temperature is 0-10 ℃, preferably 3-8 ℃;
ii) said first humidity is between 30 and 70%, preferably between 40 and 60%;
iii) step b) is followed by the further step of:
c) placing the product obtained in the step b) in the oven for a second time;
iv) in step 3), the coating treatment is carried out in an oven at the first temperature and the first humidity;
v) respectively coating the water-based paint to be detected on 3 fiber cement flat plates, wherein the coating amount of the water-based paint layer is respectively a first dosage, a second dosage and a third dosage;
vi) said first time is from 12 to 36 hours, preferably from 18 to 30 hours.
In another preferred embodiment, the first dosage is 350-380g/m2；
The second dosage is 450-2(ii) a And
the third dosage is 650-710g/m2。
In another preferred embodiment, the first dosage is 210-260g/m2；
The second dosage is 320-380g/m2(ii) a And
the third dosage is 450-2。
In another preferred example, the judging means:
i) when the water-based coating layer cracks under the conditions of the first amount, the second amount and the third amount, judging the water-based coating to be an unqualified product;
ii) when the water-based paint layer does not crack under the condition of the first amount and cracks under the conditions of the second amount and the third amount, judging the water-based paint to be a tertiary product;
iii) when the water-based paint layer does not crack under the conditions of the first amount and the second amount and cracks under the condition of a third amount, judging the water-based paint as a secondary product;
iv) judging the water-based paint to be a first-grade product when the water-based paint layer does not crack under the conditions of the first amount, the second amount and the third amount.
It is to be understood that within the scope of the present invention, the above-described features of the present invention and those specifically described below (e.g., in the examples) may be combined with each other to form new or preferred embodiments. Not to be reiterated herein, but to the extent of space.
Drawings
FIG. 1 is a schematic representation of a fiber cement slab.
Fig. 2 is a schematic diagram of the test method of the present invention, wherein ① fiber cement slabs, ② putty layers, ③ paint layers.
FIG. 3 is a paint film obtained by applying product A of example 1 according to the test method of the invention under the following conditions: and (5) loosening putty at normal temperature and brushing 40 g.
FIG. 4 is a paint film obtained by applying product B of example 1 according to the test method of the invention under the following conditions: and (3) loosening putty and brushing at normal temperature, wherein 40 g of brushing is adopted for A, 30 g of brushing is adopted for B, and 20 g of brushing is adopted for C.
FIG. 5 shows a paint film of product A and product B of example 1, which is formed by large-area field application, wherein the left image is product A and the right image is product B.
FIG. 6 is a paint film obtained by applying product C of example 2 according to the test method of the invention under the following conditions: 40 g and normal temperature.
FIG. 7 is a paint film obtained by applying product D of example 2 according to the test method of the invention under the following conditions: and (3) brushing at normal temperature, wherein A is 40 g, B is 30 g, and C is 20 g.
FIG. 8 is a paint film of example 2, product C and product D, applied in large areas on the spot, with product C on the left and product D on the right.
Detailed Description
The inventor of the invention has long and intensive research, and the thick coating anti-cracking performance of the water-based polymer wall coating material can be rapidly and effectively detected by simulating the coating of the water-based polymer wall coating material with a small amount and combining with environmental simulation. On this basis, the inventors have completed the present invention.
Term(s) for
As used herein, the terms "aqueous polymeric wall covering", "coating material", "water-based paint", or "wall covering" are used interchangeably.
Detection method
The invention provides a method for testing the cracking resistance of a plane thick coating of a water-based paint, which is characterized by comprising the following steps of:
1) providing a fiber cement flat plate, an oven, a water-based paint to be detected, optional putty and optional primer matched with the water-based paint to be detected;
2) setting the temperature of the oven to a first temperature and the humidity of the oven to a first humidity;
3) coating the water-based paint to be detected on the fiber cement flat plate to obtain the fiber cement flat plate coated with the water-based paint layer;
4) placing the fiber cement flat plate coated with the water-based coating layer obtained in the step 3) in the oven of the step 2) for treatment for the first time, then taking out and observing the cracking condition of the water-based coating layer on the surface of the fiber cement flat plate, and judging the plane thick coating anti-cracking performance of the water-based coating based on the cracking condition.
Compared with the prior art, the invention has the following main advantages:
(1) the method can quickly and effectively detect the thick coating anti-cracking performance of the wall coating material without field construction;
(2) the method has the characteristic of wide application range, and common wall coating materials can be detected by the method;
(3) the method has the characteristics of high accuracy, low cost, short time and less material consumption.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers. Unless otherwise indicated, percentages and parts are by weight.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred embodiments and materials described herein are intended to be exemplary only.
Raw material information
Fiber cement flat plate (30cm 20cm), self-made putty, goat hair brush (4 inches), a baking oven with temperature and humidity regulation.
The self-made putty is divided into normal putty and loose putty, and the mixture ratio is as follows:
normal putty: talc powder, cooked rubber powder, glue and water are 100: 1: 10: 34;
loosening the putty: talc powder, cooked rubber powder and water, 95: 1: 50
Test method
1. Test of crack resistance of normal-temperature thick coating of interior wall water-based polymer wall coating material
1.1 preparing 6 cement fiber flat plates, cleaning the cement fiber flat plates, and ensuring the surfaces to be dry and clean for later use;
1.2 scraping normal putty on 3 cement fiber flat plates twice, drying, and polishing for later use;
1.3, scraping loose putty on another 3 cement fiber flat plates twice, drying, and polishing for later use;
1.4 brushing 20 g, 30 g and 40 g of products to be detected on the prepared normal putty cement fiber flat plate at one time respectively;
1.5 brushing 20 g, 30 g and 40 g of products to be detected on the prepared loose putty cement fiber flat plate at one time respectively;
1.6 setting the temperature of the oven to 23 +/-2 ℃ and the relative humidity to be 50 +/-5%, putting the cement fiber flat plate which is coated with the cement fiber flat plate, maintaining for 24 hours, taking out, and observing the cracking condition of a paint film on the surface of the cement fiber flat plate by naked eyes;
2. low-temperature thick-coating anti-cracking performance test of interior wall water-based polymer wall coating material
2.1 preparing 6 cement fiber flat plates, cleaning the cement fiber flat plates to ensure that the surfaces are dry and clean for later use;
2.2 scraping normal putty on 3 cement fiber flat plates twice, drying, and polishing for later use;
2.3, scraping loose putty on another 3 cement fiber flat plates twice, drying, and polishing for later use;
2.4 setting the temperature of the oven to be 5 +/-1 ℃ and the humidity to be 50 +/-5%, putting all the polished cement fiber flat plates into the oven, and at least standing for 2 hours;
2.5 respectively brushing 15 g, 20 g and 30 g of products to be detected on a normal putty cement fiber flat plate in a low-temperature environment at one time;
2.6 brushing 15 g, 20 g and 30 g of products to be detected on the loose putty cement fiber flat plate in the low-temperature environment at one time respectively;
2.7 taking out the film after 24 hours of maintenance in a low-temperature environment, and observing the cracking condition of the surface paint film by naked eyes.
3. Test of crack resistance of normal-temperature thick coating of water-based polymer wall coating material of outer wall
3.1 preparing 3 cement fiber flat plates, cleaning the cement fiber flat plates to ensure that the surfaces are dry and clean, and keeping the cement fiber flat plates for later use without batch putty scraping;
3.2 brush-coating 7 g of primer matched with a product to be tested on a cement fiber flat plate, and putting the cement fiber flat plate into an environment with the temperature of 23 +/-2 ℃ and the relative humidity of 50 +/-5% for maintenance till drying;
3.3 brushing 20 g, 30 g and 40 g of products to be detected on the cement fiber flat plate at one time respectively;
and 3.4, taking out the film after 24-hour maintenance in a normal temperature environment, and observing the cracking condition of the surface paint film by naked eyes.
4. Low-temperature thick-coating anti-cracking performance test of water-based polymer wall coating material for exterior wall
4.1 preparing 3 cement fiber flat plates, cleaning the cement fiber flat plates to ensure that the surfaces are dry and clean, and keeping the cement fiber flat plates for later use without batch putty scraping;
4.2 brush-coating 7 g of primer matched with a product to be tested on a cement fiber flat plate, and putting the cement fiber flat plate into an environment with the temperature of 23 +/-2 ℃ and the relative humidity of 50 +/-5% for maintenance till drying;
4.3 setting the temperature of the oven to be 5 +/-1 ℃ and the humidity to be 50 +/-5%, putting all cement fiber flat plates with the ready-made primer into the oven, and at least standing for 2 hours;
4.4 brushing 20 g, 30 g and 40 g of products to be detected on the cement fiber flat plate at one time respectively in a low-temperature environment;
4.5 taking out the film after 24 hours of maintenance in a low-temperature environment, and observing the cracking condition of the surface paint film by naked eyes.
And (4) evaluating the result:
1. taking the coating gram number of the cracking phenomenon on the surface of the paint film as a judgment standard, the more the coating gram number, the better;
2. and (4) integrating the test results under different conditions, and taking the result with the worst performance as the judgment basis of the grade and the evaluation result.
3. The same product must be tested at least 3 times in parallel, 2 times or more than 2 times are qualified, and the product is judged to be qualified.
Rating of grade
Description of the test methods:
1. in the method, the common use environment of the water-based polymer wall coating material is referred, and two variables of different putty bottom layers and different temperature maintenance are set. Normal putty simulates the common bottom condition, and loose putty simulates the bottom condition under the extreme condition; because the temperature difference in different areas of China is large, two temperature variables of normal temperature (23 +/-2 ℃) and low temperature (5 +/-1 ℃) are selected and introduced in the temperature range applicable to the water-based polymer wall coating material.
2. In the method, the gram number for coating the surface layer refers to the amount of the water-based polymer wall coating material used in actual large-area construction. The amount of the water-based polymer wall coating material used was about 120 g/m, and the number of coating grams was calculated to be 7.2 g/m by converting the area of a cement fiber plate (30cm × 20cm) used for the test. In actual construction, the wall surface is generally painted 2 times, and repeated painting may occur on the wall edge of the boundary of two walls or the corner of the boundary of three walls, so that the painting may occur 3 times, 4 times or even 6 times. We calculate the brush gram for 2-6 times to round. Under the normal temperature environment, a certain elastic room is left on the basis of the lowest requirement of the coating gram number, and the test coating gram numbers of 20 g, 30 g and 40 g are determined; under a low-temperature environment, the water-based polymer wall surface coating material for the inner wall takes the minimum requirement as a limit due to the more limited conditions, and the coating gram requirements of 15 g, 20 g and 30 g are determined; the water-based polymer wall surface coating material for the outer wall has the same requirements as the normal temperature, namely 20 g, 30 g and 40 g, because the use environment is more variable than that of the inner wall.
Example 1 comparison test of thick coating anti-cracking performance of aqueous polymer wall coating material for interior wall and large-area field construction test
Randomly selecting a high-grade inner wall water-based high-molecular wall coating material product A (the price is more than or equal to 100 yuan/liter) and a low-grade inner wall water-based high-molecular wall coating material product B (the price is less than or equal to 10 yuan/liter) in the market, and testing according to the methods 1 and 2 in the above testing methods to obtain the following results:
remarking: check mark indicates no cracking of the paint film, and x indicates cracking of the paint film
FIG. 3 is a paint film obtained by applying product A of example 1 according to the test method of the invention under the following conditions: and (5) loosening putty at normal temperature, and brushing 40 g to show no abnormity.
FIG. 4 is a paint film obtained by applying product B of example 1 according to the test method of the invention under the following conditions: and (3) loosening putty and brushing at normal temperature, wherein 40 g of brushing is adopted to show severe cracking, 30 g of brushing is adopted to show slight cracking, and 20 g of brushing is adopted to show no abnormity.
And (5) judging a result:
① As can be seen by comparing FIG. 3 with FIG. 4, the thick coating cracking resistance of product A is significantly better than that of product B, and is positively correlated with the grade;
② comparison of A, B, C in fig. 4 shows that the more grams of paint are applied to the same product, the more severe the cracking phenomenon occurs, and the more logical it is.
Further, the product A and the product B are subjected to large-area field construction (the air temperature is 15-20 ℃, and the air humidity is 50-60 percent), and comparison is carried out, and the results are as follows:
| name (R) | Cracking condition |
| Product A | No surface abnormality of the water-based polymer coating material |
| Product B | The surface of the water-based polymer coating material of the wall surface is not abnormal, and the wall corner slightly cracks |
FIG. 5 is a paint film obtained by large-area on-site construction of a product A and a product B in example 1, wherein the left picture is the product A, the right picture is the product B, and it can be seen that the product A has no abnormality and the corner of the product B is slightly cracked.
And (4) judging a result:
as can be seen from the right picture of fig. 5, the cracking phenomenon occurs at the corner where repeated brushing occurs, but the wall surface has no abnormality. The test results were consistent with the results of the previous cement fiberboard test.
Example 2 comparative test of thick coating anti-cracking performance of water-based polymer wall coating material for exterior wall and large-area field construction test
An outer wall water-based polymer wall coating material product C (national standard superior) and an outer wall water-based polymer wall coating material product D (product description does not meet the content of relevant standards) are randomly selected in the market, and the test is carried out according to the methods 3 and 4 in the test methods, and the results are as follows:
remarking: check mark indicates no cracking of the paint film, and x indicates cracking of the paint film
FIG. 6 is a paint film obtained by applying product C of example 2 according to the test method of the invention under the following conditions: 40 g, normal temperature, no abnormity is shown.
FIG. 7 is a paint film obtained by applying product D of example 2 according to the test method of the invention under the following conditions: and (3) brushing at normal temperature, wherein 40 g of brushing shows severe cracking, 30 g of brushing shows severe cracking, and 20 g of brushing shows slight cracking.
And (5) judging a result:
① As can be seen by comparing FIG. 6 with FIG. 7, the thick coating cracking resistance of product C is significantly better than that of product D, which may be a counterfeit product;
② comparison of A, B, C in fig. 7 shows that the more grams of paint are applied to the same product, the more severe the cracking phenomenon occurs, and the more logical it is.
Further, the product C and the product D are subjected to outdoor large-area field construction (the air temperature is 15-20 ℃, and the air humidity is 50-60 percent), and comparison is carried out, and the results are as follows:
| name (R) | Cracking condition |
| Product C | No surface abnormality of the water-based polymer coating material |
| Product D | Cracking phenomenon appears on the surface of the water-based polymer coating material |
FIG. 8 is a paint film of product C and product D of example 2 applied in large areas in the field, wherein the left panel shows no abnormality in product C and the right panel shows cracking of the paint film in product D.
And (4) judging a result: as can be seen in fig. 8, the large area field work situation remained consistent with the results of the previous cement fiberboard test.
Through the test, the test method can quickly and conveniently test the plane thick coating anti-cracking performance of the water-based polymer wall coating material. By the method, the crack resistance of the plane thick coating of the water-based polymer wall coating material can be tested under the condition of simulating actual construction and maintenance environment to the greatest extent, more, faster and more practical data and parameters are provided for research, development and improvement of water-based polymer wall coating material products, and the original purpose of the invention is realized.
All documents referred to herein are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes and modifications of the present invention can be made by those skilled in the art after reading the above teachings of the present invention, and these equivalents also fall within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A method for testing the plane thick coating cracking resistance of a water-based coating is characterized by comprising the following steps:
1) providing a fiber cement flat plate, an oven, a water-based paint to be detected, optional putty and optional primer matched with the water-based paint to be detected;
2) setting the temperature of the oven to a first temperature and the humidity of the oven to a first humidity;
3) coating the water-based paint to be detected on the fiber cement flat plate to obtain the fiber cement flat plate coated with the water-based paint layer;
4) placing the fiber cement flat plate coated with the water-based coating layer obtained in the step 3) in the oven of the step 2) for treatment for the first time, then taking out and observing the cracking condition of the water-based coating layer on the surface of the fiber cement flat plate, and judging the plane thick coating anti-cracking performance of the water-based coating based on the cracking condition.
2. The method as claimed in claim 1, wherein when the aqueous paint to be tested is an interior wall water paint, before step 3), the method further comprises the following steps:
3-1) batch-coating the putty on the fiber cement flat plate.
3. The method of claim 2, wherein the method has one or more characteristics selected from the group consisting of:
1) the water-based paint to be detected is respectively coated on 3 fiber cement flat plates, and the coating amount of the water-based paint layer is respectively a first dosage, a second dosage and a third dosage;
2) the first temperature is 15-30 ℃;
3) the first humidity is 30-70%;
4) the first time is 12-36 h.
4. The method of claim 2, wherein the method has one or more characteristics selected from the group consisting of:
i) the first temperature is 0-10 ℃;
ii) the first humidity is 30-70%;
iii) after step 3-1) and before step 3) further comprising the steps of:
3-2) placing the product obtained in the step 3-1) in the oven for a second time;
iv) in step 3), the coating treatment is carried out in an oven at the first temperature and the first humidity;
v) respectively coating the water-based paint to be detected on 3 fiber cement flat plates, wherein the coating amount of the water-based paint layer is respectively a first dosage, a second dosage and a third dosage;
vi) the first time is 12-36 h.
5. The method as claimed in claim 1, wherein when the water-based paint to be tested is a water-based paint for exterior walls, the step 3) is preceded by the following steps:
a) brushing the primer on the fiber cement flat plate to obtain a fiber cement flat plate coated with a primer layer;
b) placing the fiber cement flat plate coated with the primer layer in an environment with the temperature of 15-30 ℃ and the humidity of 30-70% until the primer layer is dried.
6. The method of claim 5, wherein the method has one or more characteristics selected from the group consisting of:
1) the water-based paint to be detected is respectively coated on 3 fiber cement flat plates, and the coating amount of the water-based paint layer is respectively a first dosage, a second dosage and a third dosage;
2) the first temperature is 15-30 ℃;
3) the first humidity is 30-70%;
4) the first time is 12-36 h.
7. The method of claim 5, wherein the method has one or more characteristics selected from the group consisting of:
i) the first temperature is 0-10 ℃;
ii) the first humidity is 30-70%;
iii) step b) is followed by the further step of:
c) placing the product obtained in the step b) in the oven for a second time;
iv) in step 3), the coating treatment is carried out in an oven at the first temperature and the first humidity;
v) respectively coating the water-based paint to be detected on 3 fiber cement flat plates, wherein the coating amount of the water-based paint layer is respectively a first dosage, a second dosage and a third dosage;
vi) the first time is 12-36 h.
8. The method as claimed in claim 3, 6 or 7, wherein the first amount is 350-380g/m2；
The second dosage is 450-2(ii) a And
the third dosage is 650-710g/m2。
9. The method as claimed in claim 4, wherein the first amount is 210-260g/m2；
The second dosage is 320-380g/m2(ii) a And
the third dosage is 450-2。
10. The method of claim 3, 4, 6 or 7, wherein said determining is:
i) when the water-based coating layer cracks under the conditions of the first amount, the second amount and the third amount, judging the water-based coating to be an unqualified product;
ii) when the water-based paint layer does not crack under the condition of the first amount and cracks under the conditions of the second amount and the third amount, judging the water-based paint to be a tertiary product;
iii) when the water-based paint layer does not crack under the conditions of the first amount and the second amount and cracks under the condition of a third amount, judging the water-based paint as a secondary product;
iv) judging the water-based paint to be a first-grade product when the water-based paint layer does not crack under the conditions of the first amount, the second amount and the third amount.
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