Wall alkali efflorescence simulation experiment system and experiment method

Abstract

The invention provides a wall alkali efflorescence simulation experiment system which comprises a test room, a plurality of alkali efflorescence experiment walls arranged in the test room and a temperature and humidity adjusting device used for controlling the temperature and humidity in the test room, alkali materials are mixed in the alkali efflorescence experiment walls, the alkalinity of the alkali efflorescence experiment walls is different, and the alkalinity of the alkali efflorescence experiment walls is different from that of the temperature and humidity adjusting device. A plurality of water seepage pipes, wall body humidity sensors and PH value sensors are embedded in each alkali efflorescence experiment wall, water seepage micropores are formed in the surfaces of the water seepage pipes, the wall body humidity sensors are used for monitoring the humidity of the alkali efflorescence experiment walls, and the PH value sensors are used for monitoring the alkalinity of the alkali efflorescence experiment walls; the invention further provides a wall alkali efflorescence simulation experiment method. The wall alkali efflorescence simulation experiment system and the wall alkali efflorescence simulation experiment method have the advantages of scientific design, short experiment period and high practicability, and experiment results are close to practical application.

Description

Technical Field

[0001] The invention relates to the technical field of coating research and development, and in particular to a wall alkali return simulation experimental system and an experimental method. Background Art

[0002] Alkali reversion on the wall is usually caused by the alkaline substances inside the wall dissolving in water. As the water migrates to the wall surface, the alkaline substances crystallize and precipitate after the water evaporates, causing white crystals to appear on the wall surface. In severe cases, it can also cause peeling and shedding of the paint on the wall surface. When some raw materials with high alkali content are used in the wall, coupled with factors such as humid environment, alkali reversion is very likely to occur.

[0003] In order to develop a coating with the ability to resist alkali reversion, it is necessary to test its actual ability to resist alkali reversion; although the national standard has clear provisions on the experimental method for the alkali resistance of coatings, which is to place the sample coated with paint in a saturated calcium hydroxide solution, and check the appearance of the coating film after soaking for a certain period of time, in actual application, alkali will continuously migrate from the wall to the surface with water, and after the water evaporates, it will gradually precipitate from the wall surface. During the precipitation process, the volume will expand, thus causing great damage to the coating.

[0004] Since the above two situations are very different, the existing paint alkali resistance test method cannot determine the actual performance of the paint in restraining alkali reversion. In actual applications, for the wall to revert to alkali, the wall must first be exposed to moisture for a long time, and then slowly turn to dryness, and the alkali will slowly precipitate from the wall. This cycle takes at least one year, which cannot meet the requirements of efficient experiments.

[0005] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0006] The purpose of the present invention is to provide a wall alkali return simulation experimental system and experimental method with scientific design, experimental results close to actual application, short experimental cycle and strong practicality in view of the deficiencies in the prior art.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a wall alkali return simulation experiment system, including a test room, a plurality of alkali return experiment walls arranged in the test room, and a temperature and humidity regulating device for controlling the temperature and humidity in the test room, the alkali return experiment wall is mixed with alkaline materials, and the alkalinity of each of the alkali return experiment walls is different, each of the alkali return experiment walls is embedded with a plurality of seepage pipes, wall humidity sensors and pH sensors, the surface of the seepage pipes is provided with seepage micropores, the wall humidity sensor is used to monitor the humidity of the alkali return experiment wall, and the pH sensor is used to monitor the alkalinity of the alkali return experiment wall.

[0008] Based on the above, the alkali return experiment wall includes a concrete wall and a vertical plug board, a vertical slot is opened in the middle of the concrete wall, the vertical plug board is inserted in the vertical slot, the surface of the vertical plug board is coated with alkaline material, and a plurality of water-permeable holes are opened on the board surface of the vertical plug board; a plurality of seepage pipes are located on one side of the vertical slot, and the wall humidity sensor and the pH value sensor are located on the other side of the vertical slot.

[0009] Based on the above, a moisture-proof layer is laid on the floor of the test room, and a heat-insulating layer is arranged outside the wall of the test room.

[0010] Based on the above, each of the alkali return test walls has a height of 1 m, a length of 2 m, and a thickness of 15 cm.

[0011] Based on the above, the temperature and humidity adjustment device includes an air conditioner and a humidifier.

[0012] Based on the above, it also includes a microprocessor, a water supply pipeline and a booster pump arranged on the water supply pipeline. Each of the seepage pipes is supplied with water by the water supply pipeline, and each of the seepage pipes is provided with a seepage solenoid valve; the wall humidity sensor transmits the monitored wall humidity information to the microprocessor, and the microprocessor controls the opening and closing of the booster pump and the seepage solenoid valve according to whether the wall humidity information reaches the set value.

[0013] Based on the above, the plurality of seepage pipes in each of the alkali return test walls are arranged vertically and at equal intervals.

[0014] The present invention also provides a wall alkali return simulation test method, which uses the wall alkali return simulation test system as described above to conduct the test, and comprises the following steps: (1) Apply the coating to be tested on the surface of each wall of the alkali reversion test; (2) water is seeped into the alkali return test wall through a plurality of the seepage pipes, and the humidity of the alkali return test wall is monitored by the wall humidity sensor, so that the humidity of the alkali return test wall is maintained at 100%; (3) Setting the test room to a first indoor temperature and a first indoor humidity by means of the temperature and humidity adjustment device, and operating the test room in a humid and warm environment for 10-15 days; (4) Stop water seepage to the alkali return test wall, set the test room to a second indoor temperature and a second indoor humidity by the temperature and humidity adjustment device, and operate in a dry and cool environment for 5-7 days, wherein the second indoor temperature is lower than the first indoor temperature, and the second indoor humidity is lower than the first indoor humidity; (5) Observe the alkali return of the coating under different alkalinity conditions; (6) Adjust the indoor temperature and indoor humidity parameters and repeat steps (1) to (5) to obtain multiple sets of experimental data.

[0015] Compared with the prior art, the present invention has outstanding substantial features and significant progress. Specifically, the present invention mixes alkaline materials into the alkali return test wall and infiltrates water into the wall, which can simulate the process of alkaline substances dissolving in water and migrating to the wall surface along with water. The temperature and humidity in the test room can be controlled by the temperature and humidity regulating device, and the external alkali return environment can be quickly simulated to make the alkaline substances precipitate from the wall surface, shortening the experimental period. Multiple alkali return test walls with different alkalinity can be tested at the same time, which is convenient for comparing and observing the actual alkali return performance of the coating. The present invention has the advantages of scientific design, experimental results close to actual applications, short experimental period and strong practicality.

[0016] Furthermore, during the alkali return experiment, alkaline substances gradually migrate outward, which will cause the alkalinity of the wall to decrease. By coating the alkaline material on the surface of the vertical plug plate, the alkaline material can be easily replaced and replenished to repeat the test; the setting of the moisture-proof layer and the thermal insulation layer can prevent the external environment from interfering with the internal environment of the test room; the setting of the microprocessor, the booster pump and the water seepage solenoid valve facilitates automatic control of the wall humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the wall alkali return simulation experimental system in the present invention.

[0018] Figure 2 It is a cross-sectional schematic diagram of the alkali return experiment wall in the present invention.

[0019] Figure 3 It is a control principle block diagram of the microprocessor in the present invention.

[0020] In the figure: 1. Test room; 2. Alkali return test wall; 3. Seepage pipe; 4. Wall humidity sensor; 5. PH value sensor; 6. Air conditioner; 7. Humidifier; 8. Water supply pipeline; 9. Booster pump; 10. Seepage solenoid valve; 11. Moisture-proof layer; 12. Insulation layer; 21. Concrete wall; 22. Vertical plug board; 23. Vertical slot. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described in detail below through specific implementation methods. Example 1

[0022] like Figure 1-3As shown, a wall alkali return simulation experiment system includes a test room 1, four alkali return experiment walls 2 arranged in the test room 1, and a temperature and humidity regulating device for controlling the temperature and humidity in the test room 1. Each of the alkali return experiment walls 2 is mixed with alkaline materials, and the alkalinity of each of the alkali return experiment walls 2 is different, which is used for comparative experiments; each of the alkali return experiment walls 2 is embedded with a number of seepage pipes 3, a wall humidity sensor 4 and a pH value sensor 5, and the surface of the seepage pipe 3 is provided with seepage micropores, which can simulate the process of alkaline substances dissolving in water and migrating to the wall surface with water by seeping water into the wall; the wall humidity sensor 4 is used to monitor the humidity of the alkali return experiment wall 2, and the pH value sensor 5 is used to monitor the alkalinity of the alkali return experiment wall 2, so as to record experimental data.

[0023] The alkali return experiment wall 2 specifically includes a concrete wall 21 and a vertical plug board 22. A vertical slot 23 is provided in the middle of the concrete wall 21. The vertical plug board 22 is inserted in the vertical slot 23. The surface of the vertical plug board 22 is coated with an alkaline material. The alkaline material can specifically be a mixture of sodium hydroxide, potassium hydroxide, sodium silicate and on cotton cloth. The setting of the cotton cloth can ensure that the alkaline material is in close contact with the wall of the vertical slot 23 so that water can penetrate and dissolve. A plurality of water-permeable holes are provided on the board surface of the vertical plug board 22. A plurality of seepage pipes 3 are located on one side of the vertical slot 23 (the side is used for water to penetrate), and the wall humidity sensor 4 and the pH value sensor 5 are located on the other side of the vertical slot 23 (the side is used for painting). During the experiment, water enters the wall from one side, dissolves the alkaline substance, and gradually migrates to the other side. The wall humidity sensor 4 and the pH value sensor 5 are both located on one side of the paint, and the extracted data is more accurate. During the alkali return experiment, as the alkaline substances gradually migrate outward, the alkalinity of the wall will decrease, and the cotton cloth and the wall of the vertical slot 23 will gradually loosen. At this time, after the vertical plug board 22 is taken out, the alkaline material can be replaced and supplemented for reuse. In other embodiments, the alkali return experiment wall 2 can also directly mix alkaline substances such as sodium hydroxide, potassium hydroxide, sodium silicate, etc. in concrete.

[0024] Among them, each of the alkali return test walls 2 has a height of 1m, a length of 2m, and a thickness of 15cm. The actual alkali return position of the wall is generally concentrated below 1m, which can save masonry materials and facilitate operation, and is consistent with the actual wall thickness. The plurality of seepage pipes 3 in each of the alkali return test walls 2 are arranged vertically and at equal intervals to ensure uniform water seepage.

[0025] The temperature and humidity regulating device specifically includes an air conditioner 6 and a humidifier 7, which can control the temperature and humidity in the test room 1 and quickly simulate the external alkali return environment; in order to prevent the external environment from interfering with the internal environment of the test room 1, the floor of the test room 1 is paved with a moisture-proof layer 11, and the wall of the test room 1 is provided with an insulation layer 12, and windows may not be provided.

[0026] In order to facilitate the control of wall humidity, the wall alkali return simulation experiment system also includes a microprocessor, a water supply pipeline 8 and a booster pump 9 arranged on the water supply pipeline 8. Each of the seepage pipes 3 is supplied with water by the water supply pipeline 8, and each of the seepage pipes 3 is provided with a seepage solenoid valve 10; the wall humidity sensor 4 transmits the monitored wall humidity information to the microprocessor, and the microprocessor controls the opening and closing of the booster pump 9 and the seepage solenoid valve 10 according to whether the wall humidity information reaches the set value.

[0027] Working principle: The paint to be tested is applied on the surface of each of the alkali return test walls 2. By seeping water into the wall, the process of alkaline substances dissolving in water and migrating to the wall surface along with the water can be simulated; by adjusting the indoor temperature and humidity by the temperature and humidity regulating device, the external alkali return environment can be quickly simulated, so that the alkaline substances are precipitated from the wall surface, shortening the experimental period, and multiple alkali return test walls 2 with different alkalinity can be tested at the same time, which is convenient for comparison and observation of the actual alkali return restraining performance of the paint. Example 2

[0028] A wall alkali return simulation experiment method is conducted using the wall alkali return simulation experiment system in Example 1, comprising the following steps: (1) applying the coating to be tested on the surface of each of the alkali reversion test walls 2; (2) water is seeped into the alkali return experiment wall 2 through a plurality of the seepage pipes 3, and the humidity of the alkali return experiment wall 2 is monitored by the wall humidity sensor 4, so that the humidity of the alkali return experiment wall 2 is maintained at 100%; (3) The test room 1 is set to a first indoor temperature (selectable between 35-40°C) and a first indoor humidity (selectable between 80%-100%) by the temperature and humidity adjustment device, and operated in a humid and warm environment for 10-15 days; (4) Stop water seepage to the alkali return test wall 2, set the test room to the second indoor temperature (22-25°C) and the second indoor humidity (35%-40%) through the temperature and humidity adjustment device, and operate in a dry and cool environment for 5-7 days; (5) Observe the alkali return of the coating under different alkalinity conditions; (6) Adjust the indoor temperature and indoor humidity parameters and repeat steps (1) to (5) to obtain multiple sets of experimental data.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A wall alkali return simulation experimental system, characterized in that: The invention comprises a test room, a plurality of alkali return test walls arranged in the test room, and a temperature and humidity regulating device for controlling the temperature and humidity in the test room. The alkali return test walls are mixed with alkaline materials, and the alkalinity of each of the alkali return test walls is different. Each of the alkali return test walls is embedded with a plurality of seepage pipes, a wall humidity sensor and a pH value sensor. The surface of the seepage pipe is provided with seepage micropores. The wall humidity sensor is used to monitor the humidity of the alkali return test wall, and the pH value sensor is used to monitor the alkalinity of the alkali return test wall.

2. The wall alkali return simulation experimental system according to claim 1 is characterized in that: The alkali return experiment wall includes a concrete wall and a vertical plug board. A vertical slot is opened in the middle of the concrete wall. The vertical plug board is inserted into the vertical slot. The surface of the vertical plug board is coated with alkaline material. A plurality of water-permeable holes are opened on the board surface of the vertical plug board; a plurality of seepage pipes are located on one side of the vertical slot, and the wall humidity sensor and the pH value sensor are located on the other side of the vertical slot.

3. The wall alkali return simulation experimental system according to claim 2 is characterized in that: The floor of the test room is paved with a moisture-proof layer, and the outside of the wall of the test room is provided with a heat insulation layer.

4. The wall alkali return simulation experimental system according to claim 3 is characterized in that: Each of the alkali return test walls has a height of 1 m, a length of 2 m, and a thickness of 15 cm.

5. The wall alkali return simulation experimental system according to any one of claims 1 to 4, characterized in that: The temperature and humidity adjustment device includes an air conditioner and a humidifier.

6. The wall alkali return simulation experimental system according to claim 5 is characterized in that: It also includes a microprocessor, a water supply pipeline and a booster pump arranged on the water supply pipeline. Each of the seepage pipes is supplied with water by the water supply pipeline, and each of the seepage pipes is provided with a seepage solenoid valve. The wall humidity sensor transmits the monitored wall humidity information to the microprocessor, and the microprocessor controls the opening and closing of the booster pump and the seepage solenoid valve according to whether the wall humidity information reaches a set value.

7. The wall alkali return simulation experimental system according to claim 6 is characterized in that: The plurality of seepage pipes in each of the alkali return test walls are arranged vertically and at equal intervals.

8. A wall alkali return simulation test method, characterized in that: The wall alkali return simulation experimental system according to any one of claims 1 to 7 is used for the experiment. The following steps are involved: (1) Apply the coating to be tested on the surface of each wall of the alkali reversion test; (2) water is seeped into the alkali return test wall through a plurality of the seepage pipes, and the humidity of the alkali return test wall is monitored by the wall humidity sensor, so that the humidity of the alkali return test wall is maintained at 100%; (3) Setting the test room to a first indoor temperature and a first indoor humidity by means of the temperature and humidity adjustment device, and operating the test room in a humid and warm environment for 10-15 days; (4) Stop water seepage to the alkali return test wall, set the test room to a second indoor temperature and a second indoor humidity by the temperature and humidity adjustment device, and operate in a dry and cool environment for 5-7 days, wherein the second indoor temperature is lower than the first indoor temperature, and the second indoor humidity is lower than the first indoor humidity; (5) Observe the alkali return of the coating under different alkalinity conditions; (6) Adjust the indoor temperature and indoor humidity parameters and repeat steps (1) to (5) to obtain multiple sets of experimental data.

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