Method for testing performance of water-soluble paper

Abstract

The invention discloses a water-soluble paper performance testing method which comprises the following steps: (1) preparing a water-soluble paper sample, and setting water temperature, pressure and water flow speed in an experimental environment; (2) determining the dissolution rate, the complete dissolution time and the residue form of the sample under static water flow; (3) simulating an internal flow field of a pipeline under dynamic water flow, and measuring the dissolving performance of the sample at different flow speeds; and (4) calculating a diffusion coefficient D (T, P) and a reaction rate constant k (T, P) according to experimental data in combination with a diffusion reaction coupling model. The invention aims to provide a test method for quantitatively evaluating the solubility of the water-soluble paper through a diffusion reaction coupling model by combining a static soaking experiment and dynamic flow field simulation.

Description

Technical Field

[0001] The present invention relates to the technical field of water-soluble paper performance testing, and in particular to a method for testing water-soluble paper performance. Background Art

[0002] As an environmentally friendly material, water-soluble paper is widely used in welding isolation, agricultural applications and special packaging. However, there is still a lack of systematic research on the effects of water temperature, pressure and flow rate in different environments on its solubility performance. Existing test methods are difficult to comprehensively evaluate the performance of water-soluble paper in complex environments. Therefore, there is an urgent need for a test method that can combine static immersion experiments and dynamic flow field simulations to achieve quantitative evaluation of the solubility performance of water-soluble paper through a diffusion-reaction coupling model. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a test method that can combine static immersion experiments and dynamic flow field simulations to achieve quantitative evaluation of the dissolution performance of water-soluble paper through a diffusion-reaction coupling model.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A method for testing the performance of water-soluble paper, characterized in that the steps are as follows:

[0006] (1) Prepare water-soluble paper samples and set the water temperature, pressure and water flow rate in the experimental environment;

[0007] (2) Determine the dissolution rate, complete dissolution time and residual morphology of the sample under static water flow;

[0008] (3) Simulate the flow field inside the pipeline under dynamic water flow and measure the solubility performance of the sample at different flow rates;

[0009] (4) Based on the experimental data and the diffusion-reaction coupling model, the diffusion coefficient D(T, P) and the reaction rate constant k(T, P) are calculated.

[0010] Furthermore, the mass change and morphological evolution during sample dissolution were monitored in real time using a high-precision mass balance and image acquisition system.

[0011] Furthermore, in step (1), the water temperature conditions are 15°C, 25°C and 40°C, the pressure conditions are 1 atmosphere and 3 atmospheres, and the water flow velocity conditions are 0 m / s, 0.5 m / s and 1 m / s.

[0012] Furthermore, in step (3), the dynamic water flow experimental environment is a closed-loop circulating water tank, and the flow rate error is controlled within ±0.05 m / s.

[0013] Furthermore, the diffusion-reaction coupling model in step (4) is:

[0014]

[0015] Among them, D(T,P) is the diffusion coefficient, k(T,P) is the reaction rate constant, T is the temperature, P is the pressure, and C(x,t) is the concentration, which represents the concentration distribution of the substance in space x and time t.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The test method of the present invention is based on the diffusion-reaction coupling model, combined with static and dynamic experimental conditions, and can accurately evaluate the influence of water-soluble paper at different water temperatures, pressures and flow rates on the dissolution rate and kinetic parameters of water-soluble paper, with high applicability and accuracy. It can be widely used in welding isolation, agricultural irrigation, environmentally friendly packaging and other scenarios, and supports the design optimization and performance evaluation of water-soluble paper materials. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to embodiments.

[0019] Example 1

[0020] A method for testing the performance of water-soluble paper, characterized in that the steps are as follows:

[0021] (1) Prepare water-soluble paper samples and set the water temperature, pressure and water flow rate in the experimental environment. The water temperature conditions are 15°C, 25°C and 40°C, respectively simulating the effects of low temperature, medium temperature and high temperature environments on the dissolution behavior of water-soluble paper. The pressure conditions are 1 atmosphere and 3 atmospheres to evaluate the comprehensive effect of high pressure environment on diffusion rate and reaction rate. The water flow rate conditions are 0m / s, 0.5m / s and 1m / s, respectively simulating the effects of static environment and dynamic water flow on dissolution performance.

[0022] (2) Determine the dissolution rate, complete dissolution time and residual morphology of the sample under static water flow.

[0023] (3) Simulate the internal flow field of the pipeline under dynamic water flow and measure the solubility performance of the sample at different flow rates. The dynamic water flow experimental environment is a closed-loop circulating water tank. The closed-loop circulating water tank in this embodiment is a water tank device that can dynamically adjust the flow rate disclosed in the invention patent with application number CN202121185221.2. The flow rate error is controlled within ±0.05m / s to ensure the test accuracy.

[0024] (4) Based on the experimental data and the diffusion-reaction coupling model, the diffusion coefficient D(T, P) and the reaction rate constant k(T, P) are calculated. The diffusion-reaction coupling model is:

[0025]

[0026] Among them, D(T,P) is the diffusion coefficient, k(T,P) is the reaction rate constant, T is the temperature, P is the pressure, and C(x,t) is the concentration, which represents the concentration distribution of the substance in space x and time t.

[0027] In the present invention, the mass change and morphological evolution during the sample dissolution process are monitored in real time by a high-precision mass balance and an image acquisition system. Conventional water-soluble paper testing methods are usually carried out under a single environmental parameter, and only the dissolution time is recorded, which fails to reveal the dissolution mechanism of water-soluble paper in a complex environment. The present invention combines the diffusion-reaction coupling model to accurately fit the experimental data and obtain the diffusion coefficient D(T, P) and the reaction rate constant k(T, P). Compared with conventional methods, the present invention can not only comprehensively analyze the influence of environmental parameters on dissolution behavior, but also provide a theoretical basis for the selection and optimization of water-soluble paper in different scenarios.

[0028] Assume that the water-soluble paper is uniformly dissolved in water, and assume that the water-soluble paper is uniformly distributed in a certain area at the beginning of the experiment. In this embodiment, it is assumed that the water temperature is 15° C., the pressure is 1 atmosphere, and the flow rate is 0.

[0029] Initial concentration C o The initial mass of the water-soluble paper divided by the volume of water, which is 1 g / L in this embodiment; the final concentration C t is the concentration of the water-soluble paper after 40 minutes, which is 0.1 g / L in this embodiment. Dissolution complete time t: the time required from the start of the experiment to the complete dissolution of the water-soluble paper, which is 40 min in Example 1. Diffusion distance x is the length of the water tank, which is 10 cm in this embodiment. The diffusion coefficient D is determined by analyzing the diffusion of a substance from a high concentration area to a low concentration area. Under static conditions, the diffusion coefficient can be calculated using the following simplified formula:

[0030]

[0031] After obtaining the two parameters D and k, the concentration at any time and location can be calculated by combining the diffusion-reaction coupling model. After calculation, it was found that the diffusion coefficient D and the reaction rate constant k were significantly reduced under low temperature conditions, indicating that the dissolution behavior is mainly limited by temperature.

[0032] Example 2

[0033] The water temperature was set to 25°C, the pressure to 3 atmospheres, and the flow rate to 1m / s. The high pressure and high-speed flow field significantly accelerated the dissolution process. The experiment showed that the complete dissolution time of the water-soluble paper was shortened to 8 minutes, and the residue almost disappeared. Model analysis showed that the reaction rate constant k increased under high pressure conditions, while the high flow rate promoted the convection-diffusion effect and improved the overall dissolution efficiency.

[0034] Example 3

[0035] The water temperature was set to 40°C, the pressure to 1 atm, and the flow rate to 0.5 m / s. High temperature significantly increased the dissolution rate, and the solution was completely dissolved within 10 minutes with extremely low residual mass. The optimization model showed that the diffusion coefficient D increased significantly under high temperature conditions, and the reaction rate constant k reached a peak.

[0036] Example 4

[0037] The water temperature was set to 25°C, the pressure to 1 atm, and the flow rate to 0 m / s. Under moderate temperature and pressure, the dissolution time of the water-soluble paper was about 20 minutes, and there was less residue. Model analysis showed that the diffusion and reaction rates were relatively balanced under these conditions, which was suitable for conventional industrial applications.

[0038] Example 5

[0039] The water temperature was set to 15°C, the pressure to 3 atmospheres, and the flow rate to 0.5 m / s. Under high pressure and dynamic flow conditions, the dissolution time was about 15 minutes. The model fitting results showed that high pressure significantly increased the reaction rate, while the dynamic flow field enhanced the diffusion effect, making the dissolution rate better than that under static conditions.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing the performance of water-soluble paper, characterized in that: Here are the steps: (1) Prepare water-soluble paper samples and set the water temperature, pressure and water flow rate in the experimental environment; (2) Determine the dissolution rate, complete dissolution time and residual morphology of the sample under static water flow; (3) Simulate the flow field inside the pipeline under dynamic water flow and measure the solubility performance of the sample at different flow rates; (4) Based on the experimental data and the diffusion-reaction coupling model, the diffusion coefficient D(T, P) and the reaction rate constant k(T, P) are calculated.

2. A method for testing the performance of water-soluble paper according to claim 1, characterized in that: The mass change and morphology evolution during sample dissolution were monitored in real time using a high-precision mass balance and image acquisition system.

3. A method for testing the performance of water-soluble paper according to claim 1, characterized in that: In step (1), the water temperature conditions are 15° C., 25° C. and 40° C., the pressure conditions are 1 atmosphere and 3 atmospheres, and the water flow velocity conditions are 0 m / s, 0.5 m / s and 1 m / s.

4. A method for testing the performance of water-soluble paper according to claim 1, characterized in that: The dynamic water flow experimental environment in step (3) is a closed-loop circulating water tank, and the flow rate error is controlled within ±0.05m / s.

5. A method for testing the performance of water-soluble paper according to claim 1, characterized in that: The diffusion-reaction coupling model in step (4) is: Among them, D(T, P) is the diffusion coefficient, k(T, P) is the reaction rate constant, T is the temperature, P is the pressure, and C(x, t) is the concentration, which represents the concentration distribution of the substance in space x and time t.

Images