A calculation method for the actual drying time of a guangqi paint film

Abstract

A calculation method for the dry-to-touch time of a guangqi paint film of the present invention relates to the field of painting construction technology for ancient building wooden structures. Aiming at the problem of low efficiency and high cost in the current method of measuring the dry-to-touch time of a guangqi paint film by relying on instrument equipment, the steps are as follows: According to the test data obtained from the paint film drying tests of three ratios of guangqi paint film under different temperature and relative humidity conditions, the fitting function between the surface dry time and the dry-to-touch time of the guangqi paint film is calculated as follows: t 实干 = 14.27t 表干 - 2.34t 表干 2 + 0.61t 表干 3 - 6.84, where: t 实干 represents the dry-to-touch time, with the unit of h; t 表干 represents the surface dry time, with the unit of h; The three ratios of the guangqi paint film are the mass ratios of raw lacquer to tung oil of 4:6, 5:5, or 6:4 respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of finishing construction of ancient building wooden structures, and particularly relates to a calculation method for the actual dry time of a guangqi paint film. Background Technique

[0002] Guangqi paint is a coating made by mixing raw lacquer and cooked tung oil in a specific ratio. It can not only reduce the usage amount of raw lacquer, but also the dried guangqi paint film has a bright color, good fullness, and strong water resistance, and is widely used in the decorative construction of wooden structures.

[0003] The drying performance of the guangqi paint film is expressed by the drying time. The drying time refers to the time when a paint film with a certain thickness reaches the dry state from the liquid state under certain conditions, and is divided into the surface dry time and the actual dry time. The surface dry time refers to the time when the surface forms a film, and the actual dry time refers to the time when a solid paint film is completely formed. The surface dry time of the guangqi paint film is short and is easily measured by the finger-touch method, while the actual dry time is long and is difficult to accurately measure. Since the actual dry time of the guangqi paint film has an important influence on the subsequent process arrangement and construction quality of the wooden structure building construction, therefore, predicting in advance the actual dry time of the guangqi paint film can effectively help the on-site construction personnel to reasonably arrange the construction process and improve the construction quality.

[0004] At present, the literature that has been published records the measurement methods for the surface dry time and the actual dry time of the guangqi paint film, and there is still a lack of relevant research on the relationship between the surface dry time and the actual dry time of the guangqi paint film. Summary of the Invention

[0005] Aiming at the problems of low efficiency and high cost existing in the current measurement method for the actual dry time of the guangqi paint film relying on instrument equipment, the purpose of the present invention is to provide a calculation method for the actual dry time of the guangqi paint film.

[0006] The technical solution adopted by the present invention to solve its technical problems is that the calculation method for the actual dry time of the guangqi paint film is as follows: Step S1: According to the test data obtained from the paint film drying test of the guangqi paint film with three ratios under different temperature and relative humidity conditions, calculate the fitting function between the surface dry time and the actual dry time of the guangqi paint film, that is, the following formula (1):

[0007] t 实干 = 14.27t 表干 - 2.34t 表干 2 + 0.61t 表干 3 - 6.84 (1)

[0008] In the formula: t 实干 represents the actual dry time, and the unit is h;

[0009] t 表干Indicates the surface drying time, in h;

[0010] The three ratios of Guangqi paint film are raw lacquer and tung oil, with a mass ratio of 4:6, 5:5 or 6:4 respectively.

[0011] The method for calculating the actual drying time of the Guang lacquer film of the present invention calculates a fitting function between the surface drying time and the actual drying time based on test data obtained from paint film drying tests of three commonly used ratios of Guang lacquer under different temperature and relative humidity conditions. Then, the ratio of Guang lacquer is selected in the actual coating project, and the actual drying time of the Guang lacquer film is calculated by combining the surface drying time of the Guang lacquer film with the corresponding fitting function, thereby accurately, efficiently and low-costly determining the actual drying time of the Guang lacquer film without the intervention of test equipment, which is convenient for construction personnel to predict the actual drying time of the paint film, and can more efficiently arrange subsequent construction procedures according to the actual drying time, thereby improving the construction quality and overall construction efficiency of the ancient building wooden structure coating project. In addition, since the above-mentioned fitting function is calculated based on the test data of three commonly used ratios of Guang lacquer in the ancient building wooden structure coating construction, it has strong applicability and practical guiding significance for coating construction.

[0012] Furthermore, the method for calculating the actual drying time of the Guangqi paint film also includes step S2: determining the surface drying time of the Guangqi paint film, and calculating the actual drying time of the Guangqi paint film according to formula (1).

[0013] Furthermore, the surface drying time of the Guang paint film is measured by finger touch method.

[0014] Furthermore, the steps for calculating the surface drying time of the Guangqi paint film are as follows:

[0015] S11: Conduct paint film drying tests on three kinds of Guang lacquer films at different temperatures and relative humidity conditions, and record the test data under different ratios, different temperatures and relative humidity conditions;

[0016] S12: Based on the surface drying time data of the three ratios of Guang paint films under different temperature and relative humidity conditions, a fitting diagram of the experimental data of surface drying time, temperature and relative humidity is drawn, and the relationship between surface drying time, temperature and relative humidity is obtained, namely, formula (2);

[0017]

[0018] Where: t 表干1 Indicates the surface drying time when the mass ratio of raw lacquer to tung oil is 4:6, t 表干2 Indicates the surface drying time when the mass ratio of raw lacquer to tung oil is 5:5, t 表干3 It indicates the surface drying time when the mass ratio of raw lacquer to tung oil is 6:4, in hours;

[0019] T represents temperature, in °C;

[0020] Indicates relative humidity, with the unit of %RH. Brief Description of the Drawings

[0021] Figure 1 It is a function fitting graph of the surface drying time and through drying time of guangqi in an embodiment of the present invention;

[0022] Figure 2 It is a fitting graph of the test data of the surface drying time of guangqi with temperature and relative humidity in an embodiment of the present invention. Detailed Embodiments

[0023] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0024] The core idea of the technical solution of the present invention is: to establish a fitting function between the surface drying time and the through drying time of guangqi, and use the fitting function to deduce and calculate the through drying time of guangqi from the surface drying time.

[0025] Embodiment 1

[0026] Combined with Figure 1 and Figure 2 to illustrate the calculation method of the through drying time of the guangqi paint film of the present invention, the steps are as follows:

[0027] Select three common ratios of guangqi in the actual painting project of wooden structure buildings, that is, the mass ratios of raw lacquer to tung oil are 4:6, 5:5, or 6:4 respectively. Conduct paint film drying tests under different temperature and relative humidity conditions, and record the test data under different ratios, different temperatures, and relative humidity conditions; as Figure 1 shown, taking the surface drying time and through drying time of the guangqi paint film as the x and y axes, establish a function fitting graph of the surface drying time and through drying time, and the fitting accuracy R 2 = 0.884, and calculate the fitting function between the surface drying time and the through drying time, that is, formula (1) is as follows:

[0028] t 实干 = 14.27t 表干 - 2.34t 表干 2 + 0.61t 表干 3 - 6.84 (1)

[0029] In the formula: t 实干 Indicates the through drying time, with the unit of h;

[0030] t 表干 Indicates the surface drying time, with the unit of h.

[0031] An application example is as follows: In a certain antique building finishing project, after the Guangqi application was completed, it was found that the Guangqi surface drying time was 2.5h. According to formula (1), the actual drying time of Guangqi is calculated as follows:

[0032] It is determined that the surface drying time of Guang paint is 2.5h;

[0033] According to formula (1), the actual drying time of Guang lacquer is calculated as follows:

[0034] t 实干 =14.27t 表干 -2.34t 表干 2 +0.61t 表干 3 -6.84

[0035] Substituting the surface drying time of Guangqi 2.5h, the actual drying time is obtained to be 23.74125 hours.

[0036] The method for calculating the actual drying time of the Guang lacquer film of the present invention calculates a fitting function between the surface drying time and the actual drying time based on test data obtained from paint film drying tests of three commonly used ratios of Guang lacquer under different temperature and relative humidity conditions. Then, the ratio of Guang lacquer is selected in the actual coating project, and the actual drying time of the Guang lacquer film is calculated by combining the surface drying time of the Guang lacquer film with the corresponding fitting function, thereby accurately, efficiently and low-costly determining the actual drying time of the Guang lacquer film without the intervention of test equipment, which is convenient for construction personnel to predict the actual drying time of the paint film, and can more efficiently arrange subsequent construction procedures according to the actual drying time, thereby improving the construction quality and overall construction efficiency of the ancient building wooden structure coating project. In addition, since the above-mentioned fitting function is calculated based on the test data of three commonly used ratios of Guang lacquer in the ancient building wooden structure coating construction, it has strong applicability and practical guiding significance for coating construction.

[0037] In this embodiment, the surface drying time of the Guang lacquer film can be measured by the finger touch method in GB / T 1728-2020. The surface drying time of the Guang lacquer film is measured by the finger touch method, and the actual drying time corresponding to the Guang lacquer film is calculated by the fitting function, so as to accurately, efficiently and low-costly determine the actual drying time of the Guang lacquer film.

[0038] Example 2

[0039] Different from Example 1, this example uses the relationship between the surface drying time of the Guang paint film and the temperature and relative humidity to calculate the surface drying time of the Guang paint, and the steps are as follows:

[0040] S11: Conduct film drying tests on three formulations of guangqi paint under different temperature and relative humidity conditions, and record the test data under different formulations, temperatures, and relative humidity conditions respectively;

[0041] S12: As Figure 2 shown, based on the surface drying time data of the three formulations of guangqi paint films under different temperature and relative humidity conditions, with temperature and relative humidity as the x-axis and y-axis, and surface drying time as the z-axis, plot the fitting graph of the test data of surface drying time versus temperature and relative humidity, and obtain the relationship formula between surface drying time and temperature and relative humidity, that is, formula (2);

[0042]

[0043] In the formula: t 表干1 represents the surface drying time when the mass ratio of raw lacquer to tung oil is 4:6, t 表干2 represents the surface drying time when the mass ratio of raw lacquer to tung oil is 5:5, t 表干3 represents the surface drying time when the mass ratio of raw lacquer to tung oil is 6:4, with the unit of h;

[0044] T represents temperature, with the unit of °C;

[0045] represents relative humidity, with the unit of %RH.

[0046] Taking a certain ancient architecture painting project as an example, determine the ingredient ratio of guangqi paint according to the on-site construction requirements. The natural drying temperature of the guangqi paint after painting is 25 °C, and the relative humidity is 50%. Calculate the surface drying time of the guangqi paint as follows:

[0047] Determine that the mass ratio of raw lacquer to tung oil in the guangqi paint is 6:4;

[0048] Record that the actual temperature during the drying of the guangqi paint is 25 °C, and the relative humidity is 50%;

[0049] According to the ingredient ratio of the guangqi paint and the above formula (2), select the corresponding surface drying time calculation formula;

[0050]

[0051] Substitute the actual temperature and relative humidity to obtain the surface drying time of the guangqi paint film:

[0052] t 表干3 =-0.050×25 - 0.105×50 + 8.667 = 2.167 h

[0053] That is, directly calculate that the surface drying time of the guangqi paint film is 2.167 hours.

[0054] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure fall within the scope of the claims.

Claims

1. A calculation method for the actual drying time of a guangqi paint film, characterized in that, the steps are as follows: S1: According to the test data obtained from the paint film drying tests of three ratios of guangqi paint film under different temperature and relative humidity conditions, calculate the fitting function between the surface drying time and the actual drying time of the guangqi paint film, that is, formula (1) is as follows: t 实干 = 14.27t 表干 -2.34t 表干 2 +0.61t 表干 3 -6.84 (1) Where: t 实干 Indicates the actual working time, in h; t 表干 Indicates the surface drying time, with the unit of h; The three ratios of the guangqi paint film are that the mass ratios of raw lacquer to tung oil are 4:6, 5:5, or 6:4 respectively.

2. The calculation method for the actual drying time of a guangqi paint film according to claim 1, characterized in that, it further includes step S2: Determine the surface drying time of the guangqi paint film, and calculate the actual drying time of the guangqi paint film according to formula (1).

3. The calculation method for the actual drying time of a guangqi paint film according to claim 1, characterized in that: The surface drying time of the guangqi paint film is measured by the finger-touch method.

4. The calculation method for the actual drying time of a guangqi paint film according to claim 1, characterized in that, the calculation steps of the surface drying time of the guangqi paint film are as follows: S11: Conduct paint film drying tests on the guangqi paint films with three ratios under different temperature and relative humidity conditions, and record the test data under different ratios, different temperatures, and relative humidity conditions respectively; S12: According to the surface drying time data of the guangqi paint films with three ratios under different temperature and relative humidity conditions, draw a fitting graph of the surface drying time and the test data of temperature and relative humidity, and obtain the relationship formula between the surface drying time and temperature and relative humidity, that is, formula (2); where: t 表干1 represents the surface drying time when the mass ratio of raw lacquer to tung oil is 4:6, and t 表干2 represents the surface drying time when the mass ratio of raw lacquer to tung oil is 5:5, and t 表干3 represents the surface drying time when the mass ratio of raw lacquer to tung oil is 6:4, with the unit of h; T represents temperature, and the unit is °C; Indicates relative humidity, with the unit of %RH.

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