CN115060854A - Method for testing cracking resistance of low-temperature thick coating of architectural coating - Google Patents
Method for testing cracking resistance of low-temperature thick coating of architectural coating Download PDFInfo
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- CN115060854A CN115060854A CN202210910409.1A CN202210910409A CN115060854A CN 115060854 A CN115060854 A CN 115060854A CN 202210910409 A CN202210910409 A CN 202210910409A CN 115060854 A CN115060854 A CN 115060854A
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- 238000000576 coating method Methods 0.000 title claims abstract description 130
- 239000011248 coating agent Substances 0.000 title claims abstract description 123
- 238000005336 cracking Methods 0.000 title claims abstract description 39
- 238000012360 testing method Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003973 paint Substances 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 230000009974 thixotropic effect Effects 0.000 claims abstract description 8
- 238000007865 diluting Methods 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 10
- 238000001035 drying Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 238000010998 test method Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000002987 primer (paints) Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0096—Testing material properties on thin layers or coatings
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention relates to the technical field of coatings, in particular to a method for testing the cracking resistance of a low-temperature thick coating of an architectural coating, which comprises the following steps executed in sequence: s1, preparing building paint to be tested, a refrigerator and a putty plate for later use; s2, diluting the architectural coating to be tested, and testing the thixotropic coefficient of the architectural coating; s3, performing primary thick spraying on the diluted building paint to be tested on the putty plate; s4, placing the putty plate sprayed with the building paint to be detected into a refrigerator, and observing the cracking condition of the surface coating film of the putty plate. The building coating reaching the standard after being tested by the method can be directly used for outdoor construction, the phenomenon of low-temperature thick coating cracking can not occur, and the labor cost, the raw material cost and the time cost are greatly saved.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a method for testing the cracking resistance of a low-temperature thick coating of an architectural coating.
Background
In recent years, architectural coatings have been developed rapidly and annual yields have increased, but with an increase in low quality, inexpensive coatings. Whether the inferior coatings meet the construction requirements or not is not judged for each characteristic, and the characteristics without the judgment standards have great influence on the aspects of construction, decoration, protection and the like of the coatings. For example, the low-temperature thick coating cracking resistance of the coating is not a clear judgment standard, and the national standard GB/T9756 only has the requirement on low-temperature film formation, but the low-temperature film formation is to scrape the coating on a glass plate or other non-permeable substrates for one time to form a 400-micron thick film and observe the film forming effect at low temperature, and the low-temperature thick coating cracking resistance is to test whether the coating cracks under the conditions of low temperature and thick coating, particularly at the coating corner in the construction process, and the low-temperature thick coating cracking resistance of the coating is completely different from the low-temperature film formation standard in the national standard GB/T9756, so the low-temperature thick coating cracking resistance of the coating cannot be judged.
The low-temperature thick coating anti-cracking performance of the coating film is particularly important, particularly, in coastal areas in winter, the corner can be recoated when the temperature is lower, the coating film at the recoated position is thicker and is easy to crack under a low-temperature environment, once the coating film is cracked, the coating film can be removed and then constructed again, and the labor cost, the raw material cost and the time cost are greatly improved. Therefore, it is important to provide a method for testing the cracking resistance of the low-temperature thick coating of the architectural coating.
Disclosure of Invention
The invention aims to provide a method for testing the cracking resistance of a low-temperature thick coating of an architectural coating, aiming at the defects of the prior art, the architectural coating which reaches the standard after being tested by the method can be directly used for outdoor construction, the phenomenon of cracking of the low-temperature thick coating can not occur, and the labor cost, the raw material cost and the time cost are greatly saved.
Based on the above, the invention provides a method for testing the cracking resistance of a low-temperature thick coating of an architectural coating, which comprises the following steps performed in sequence:
s1, preparing building paint to be tested, a refrigerator and a putty plate for later use;
s2, diluting the architectural coating to be tested, and testing the thixotropic coefficient of the architectural coating;
s3, performing primary thick spraying on the diluted building paint to be tested on the putty plate;
s4, placing the putty plate sprayed with the building paint to be detected into a refrigerator, and observing the cracking condition of the surface coating film of the putty plate.
Preferably, the mass content of rubber powder in the putty on the putty plate is not more than 1.5%, and the mass content of cement is not more than 3%.
Preferably, in the step S2, the dilution ratio of the architectural coating to be tested is not more than 20%, and the thixotropic coefficient is 3.3-3.8.
Preferably, in the step S3, the one-time thick spraying amount is 450- 2 。
More preferably, in the step S3, the one-time thick spraying amount is 500g/cm 2 。
Preferably, in the step S4, the putty plate sprayed with the architectural paint to be tested is placed into a refrigerator, dried at 3-5 ℃ for 20-26h, and the cracking condition of the coating film on the surface of the putty plate is observed.
The invention has the beneficial effects that:
according to the method for testing the low-temperature thick coating cracking resistance of the architectural coating, disclosed by the invention, the dilution ratio, the thixotropic coefficient, the one-time thick coating amount and the components of the putty plate are limited, so that the standard architectural coating tested by using the method can be directly used for outdoor construction, the phenomenon of low-temperature thick coating cracking is avoided, and the labor cost, the raw material cost and the time cost are greatly saved.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood, however, that the description herein of specific embodiments is only for the purpose of illustrating the invention and is not to be taken as a limitation on the invention.
The method for testing the cracking resistance of the low-temperature thick coating of the architectural coating comprises the following steps which are sequentially executed:
s1, preparing building paint to be tested, a refrigerator and a putty plate for later use;
s2, diluting the architectural coating to be tested, and testing the thixotropic coefficient of the architectural coating;
s3, performing primary thick spraying on the diluted building paint to be tested on the putty plate;
s4, placing the putty plate sprayed with the building paint to be detected into a refrigerator, and observing the cracking condition of the surface coating film of the putty plate.
The testing method of the embodiment is used for testing the low-temperature thick-coating anti-cracking performance of the architectural coating, and the architectural coating can be directly applied to outdoor construction if the architectural coating does not crack by testing the architectural coating in a laboratory or other testing points, and the phenomenon of cracking of the low-temperature thick coating can not occur, so that the labor cost, the raw material cost and the time cost are greatly saved. Therefore, the test method of this embodiment must satisfy the test conditions of low temperature, thick coating, and poor quality substrate, and is described in detail as follows:
(1) and (4) testing the environment at low temperature, specifically in step S4, putting the putty plate sprayed with the building coating to be tested into a refrigerator, drying at 3-5 ℃ for 20-26h, and observing the cracking condition of the coating film on the surface of the putty plate. Specifically, the drying time can be selected to be 24h at 4 ℃.
The low temperature device of the embodiment can be selected from a refrigerator, and can also be selected from any other equipment which can reach 3-5 ℃, for example, an oven with the temperature set to 3-5 ℃. The main differences between the refrigerator and the oven are: the humidity in the refrigerator is high, and the humidity in the oven is low. However, the environmental humidity is not limited in the range of the test method of the present embodiment, the environmental humidity only affects the drying time of the coating film, and the cracking resistance of the coating film is determined by the substrate and is independent of the humidity. In addition, the test method of the embodiment is to test the building coating which can resist cracking under any environment, so the test method of the embodiment is universal regardless of low humidity or high humidity.
(2) Regarding thick coating, since a coating film generates shrinkage stress during drying, cracking of the coating film occurs when the shrinkage stress is greater than its own strength. One of the key factors affecting the shrinkage stress of the coating film is the thickness of the coating film, and therefore the test method of this example requires thick coating. Thick coating is generally achieved by two means, most commonly by multiple recoating, which has the following disadvantages: on one hand, the coating film is thin after the first coating, the shrinkage stress of the coating film is smaller than the strength of the putty plate, and certainly, the putty plate can not crack. Therefore, the cracking resistance of the coating film under thick coating cannot be effectively tested by adopting a mode of realizing thick coating by repeated recoating. On the other hand, in the multiple coating method, the drying time of each coating film is difficult to determine, if the primer coating film is not completely dried, another coating film is coated, defects such as bubbling and the like occur, and the volatilization of the moisture of the primer coating film is influenced, so that the coating film is difficult to completely dry.
Therefore, the embodiment adopts a one-time thick coating mode, the one-time coating reaches the required thick coating, the moisture volatilization degree or the absorption degree of the base material at each position of the coating film is different, larger shrinkage stress is easy to generate, and the anti-cracking performance is effectively tested.
The first thick coating amount is less than 450g/cm 2 When it is, for example, 300g/cm 2 And 400g/cm 2 40% of the coating film was cracked, and therefore, the primary thick coating amount of this example was selected to be 450- 2 . Wherein, when the once thick coating amount is 450g/cm 2 In the meantime, 10% of the coating film is still cracked; when the one-time thick coating amount is 500g/cm 2 No cracking phenomenon exists; when the once thick coating amount exceeds 500g/cm 2 When it is, for example, 550g/cm 2 The raw material cost will increase by 10%. Therefore, the amount of the coating is preferably 500g/cm at a time 2 。
In order to meet the requirement of one-time thick coating, the dilution ratio of the building material to be measured cannot exceed 20%, and meanwhile, the thixotropic coefficient of the diluted building coating is controlled to be 3.3-3.8, so that the problems that the viscosity of the building coating to be measured is too low, the building coating is sagging after coating, and thick coating is difficult to realize are solved.
(3) Regarding the base material, the mass content of the rubber powder in the putty plate of the embodiment is not more than 1.5%, and the mass content of the cement is not more than 3%. The putty plate is a loose base material by limiting the content of the rubber powder and the cement, and the looseness of the base material is another key factor influencing the shrinkage stress of a coating film. The looser the base material is, the stronger the water absorption is, the faster the coating film is dried, the more likely the coating film is cracked if the shrinkage stress of the coating film cannot be released, and the base material putty is also easily pulled up to be cracked if the shrinkage stress is larger than the strength of the base material putty. Therefore, the mass content of the rubber powder in the putty on the putty plate is limited to be not more than 1.5%, and the mass content of the cement is not more than 3%, so that the base material is loose, namely, the poor base material, and the test condition is ensured to be more rigorous, so that the building coating passing the test can be directly used for construction.
On the contrary, if a putty plate with 2-2.5% of rubber powder content and 5-15% of cement content which is common in the market is adopted, the putty plate is compact and is generally difficult to crack. Even if glass is used as the substrate, it does not absorb water substantially, water does not permeate into the substrate, and the drying of the entire coating film is uniformly synchronized and does not crack. These substrates were not tested for crack resistance.
Therefore, the three conditions of low temperature, thick coating and poor base material are combined and have synergistic effect, so that the building coating qualified in the test can be directly used for construction, and the cracking phenomenon can not occur.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The method for testing the cracking resistance of the low-temperature thick coating of the architectural coating is characterized by comprising the following steps of:
s1, preparing building paint, refrigerator and putty board to be tested for later use;
s2, diluting the architectural coating to be tested, and testing the thixotropic coefficient of the architectural coating;
s3, performing primary thick spraying on the diluted building paint to be tested on the putty plate;
s4, placing the putty plate sprayed with the building paint to be detected into a refrigerator, and observing the cracking condition of the surface coating film of the putty plate.
2. The method for testing the cracking resistance of the low-temperature thick coating of the architectural coating according to claim 1, wherein the method comprises the following steps: the mass content of the rubber powder in the putty on the putty plate is not more than 1.5 percent, and the mass content of the cement is not more than 3 percent.
3. The method for testing the cracking resistance of the low-temperature thick coating of the architectural coating according to claim 1, wherein the method comprises the following steps: in the step S2, the dilution ratio of the architectural coating to be tested is not more than 20%, and the thixotropic coefficient is 3.3-3.8.
4. The method for testing the cracking resistance of the low-temperature thick coating of the architectural coating according to claim 1, wherein the method comprises the following steps: in the step S3, the primary thick spraying amount is 450- 2 。
5. The method for testing the cracking resistance of the low-temperature thick coating of the architectural coating according to claim 4, wherein the method comprises the following steps: in the step S3, the one-time thick spraying amount is 500g/cm 2 。
6. The method for testing the cracking resistance of the low-temperature thick coating of the architectural coating according to claim 1, wherein the method comprises the following steps: and in the step S4, the putty plate sprayed with the building paint to be tested is placed into a refrigerator, dried for 20-26 hours at the temperature of 3-5 ℃, and the cracking condition of the surface coating film of the putty plate is observed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210910409.1A CN115060854A (en) | 2022-07-29 | 2022-07-29 | Method for testing cracking resistance of low-temperature thick coating of architectural coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210910409.1A CN115060854A (en) | 2022-07-29 | 2022-07-29 | Method for testing cracking resistance of low-temperature thick coating of architectural coating |
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| CN115060854A true CN115060854A (en) | 2022-09-16 |
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| CN202210910409.1A Pending CN115060854A (en) | 2022-07-29 | 2022-07-29 | Method for testing cracking resistance of low-temperature thick coating of architectural coating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116697904A (en) * | 2023-07-27 | 2023-09-05 | 烟台建正建设工程检测有限公司 | Dynamic cracking resistance detection device for building exterior wall putty |
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2022
- 2022-07-29 CN CN202210910409.1A patent/CN115060854A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116697904A (en) * | 2023-07-27 | 2023-09-05 | 烟台建正建设工程检测有限公司 | Dynamic cracking resistance detection device for building exterior wall putty |
| CN116697904B (en) * | 2023-07-27 | 2024-03-12 | 烟台建正建设工程检测有限公司 | Dynamic cracking resistance detection device for building exterior wall putty |
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