A method for measuring the dissolution rate of polyvinyl alcohol

Abstract

The present invention discloses a method for measuring the dissolution rate of polyvinyl alcohol, and relates to the technical field of dissolution rate calculation. The method comprises the following steps: obtaining an ambient temperature; obtaining a polyvinyl alcohol solid according to the ambient temperature and a solubility temperature model; dissolving the polyvinyl alcohol solid in water to form a polyvinyl alcohol aqueous solution; obtaining a dissolution image of the polyvinyl alcohol aqueous solution at a fixed time frequency; calculating the fractal dimension of the dissolution image; and calculating the dissolution rate of polyvinyl alcohol according to the fractal dimension. The present invention obtains the solubility of polyvinyl alcohol at the ambient temperature and the solubility temperature model, thereby obtaining a corresponding amount of polyvinyl alcohol solid, obtains an image of the dissolution process of the polyvinyl alcohol solid, processes the dissolution image, and calculates the dissolution rate of polyvinyl alcohol, thereby improving the accuracy of the measurement of the dissolution rate of polyvinyl alcohol.

Description

Technical Field

[0001] The invention relates to the technical field of dissolution rate calculation, and in particular to a method for measuring the dissolution rate of polyvinyl alcohol. Background Art

[0002] Polyvinyl alcohol is a synthetic water-soluble polymer produced by base-catalyzed hydrolysis of polyvinyl acetate. Polyvinyl alcohol has a variety of unique properties that make it widely used in many industries. Dissolution rate is a key parameter in the production process of polyvinyl alcohol, which can be used to control the quality control of polyvinyl alcohol products, process optimization of product production, and cost-effectiveness of product preparation.

[0003] At present, the commonly used methods for measuring the solubility rate of polyvinyl alcohol have the problem of inaccurate measurement, such as gravimetric analysis and conductivity method. The more accurate fluorescence method has limitations in application and cost, such as fluorescence selection, scene selection, and data processing. Therefore, there is an urgent need for an accurate and widely used method for measuring the solubility rate of polyvinyl alcohol. Summary of the invention

[0004] The purpose of the present invention is to provide a method for measuring the solubility rate of polyvinyl alcohol. The present invention obtains the solubility of polyvinyl alcohol at the temperature according to the ambient temperature and the solubility temperature model, thereby obtaining the corresponding amount of polyvinyl alcohol solid, and obtains the image of the dissolution process of the polyvinyl alcohol solid, processes the dissolution image, calculates the solubility rate of the polyvinyl alcohol, and improves the accuracy of the measurement of the solubility rate of the polyvinyl alcohol.

[0005] The purpose of the present invention is achieved by the following technical means:

[0006] In a first aspect, the present invention provides a method for measuring the solubility rate of polyvinyl alcohol, comprising the following steps:

[0007] Get the ambient temperature;

[0008] According to the ambient temperature and the solubility temperature model, obtaining polyvinyl alcohol solid;

[0009] dissolving the polyvinyl alcohol solid in water to form a polyvinyl alcohol aqueous solution;

[0010] Acquiring a dissolution image of the polyvinyl alcohol aqueous solution at a fixed time frequency;

[0011] calculating the fractal dimension of the dissolution image;

[0012] Calculating the dissolution rate of polyvinyl alcohol according to the fractal dimension;

[0013] The solubility temperature model is expressed as follows:

[0014] ,

[0015] in, is the solubility of polyvinyl alcohol, is the molar mass of polyvinyl alcohol, is the first fitting parameter, is the second fitting parameter, For temperature.

[0016] Preferably, before obtaining the polyvinyl alcohol solid according to the ambient temperature and the solubility temperature model, the method further includes: fitting the solubility temperature model; specifically, the following steps:

[0017] Obtaining a quantity of polyvinyl alcohol;

[0018] Dissolve the polyvinyl alcohol in water and wait for several hours in a constant temperature environment;

[0019] measuring the solubility of the polyvinyl alcohol;

[0020] Acquiring several sets of solubility and temperature data of the polyvinyl alcohol;

[0021] The parameters of the solubility temperature model are determined according to the solubility of the polyvinyl alcohol and the temperature.

[0022] Preferably, the measuring the solubility of the polyvinyl alcohol comprises the following steps:

[0023] obtaining an upper aqueous solution;

[0024] filtering the upper aqueous solution to obtain a sample solution;

[0025] The sample solution is analyzed by high performance liquid chromatography to obtain the solubility of the polyvinyl alcohol.

[0026] Preferably, the calculating the fractal dimension of the dissolution image comprises the following steps:

[0027] Performing gray value processing on the dissolution image to obtain a gray value image;

[0028] Acquire histogram data of the grayscale value image;

[0029] The grayscale image is preprocessed according to the histogram data.

[0030] Preferably, the preprocessing of the grayscale value image according to the histogram data comprises the following steps:

[0031] Sorting the grayscale images according to the acquisition time of the grayscale images to obtain a grayscale image sequence;

[0032] Comparing the adjacent grayscale value images in the grayscale value image sequence;

[0033] The grayscale value images having the same histogram data are removed.

[0034] Preferably, the calculating the fractal dimension of the dissolution image comprises the following steps:

[0035] Binarizing the grayscale image to obtain a binary image;

[0036] The fractal dimension is calculated based on the binary image using a box counting method.

[0037] Preferably, the step of calculating the dissolution rate of polyvinyl alcohol according to the fractal dimension comprises the following steps:

[0038] Obtaining a sequence value of the dissolve image;

[0039] According to the sequence value, the dissolution time is calculated;

[0040] Summing the fractal dimensions to obtain a fractal dimension sum;

[0041] Calculating the dissolution rate of the polyvinyl alcohol according to the dissolution time and the sum of the fractal dimensions;

[0042] The calculation formula of the dissolution rate of polyvinyl alcohol is as follows:

[0043] ,

[0044] in, is the dissolution rate of polyvinyl alcohol, is the sum of fractal dimensions, is the dissolution time.

[0045] In a second aspect, the present invention provides a polyvinyl alcohol dissolution rate measurement system, which applies the above-mentioned polyvinyl alcohol dissolution rate measurement method, and includes: a temperature acquisition module, a solid acquisition module, a solution formation module, an image acquisition module, an image processing module and a data processing module;

[0046] The temperature acquisition module is used to acquire the ambient temperature;

[0047] The solid acquisition module is used to acquire polyvinyl alcohol solid according to the ambient temperature and the solubility temperature model;

[0048] The solution forming module is used to dissolve the polyvinyl alcohol solid in water to form a polyvinyl alcohol aqueous solution;

[0049] The image acquisition module is used to acquire the dissolution image of the polyvinyl alcohol aqueous solution at a fixed time frequency;

[0050] The image processing module is used to calculate the fractal dimension of the dissolution image;

[0051] The data processing module is used to calculate the dissolution rate of polyvinyl alcohol according to the fractal dimension.

[0052] In a third aspect, the present invention provides an electronic device comprising a processor and a memory, wherein the memory is used to store computer program code, and the computer program code comprises computer instructions. When the processor executes the computer instructions, the electronic device executes the above-mentioned method for measuring the solubility rate of polyvinyl alcohol.

[0053] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by a processor of an electronic device, the processor executes the above-mentioned method for measuring the solubility rate of polyvinyl alcohol.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] The present invention obtains the solubility of polyvinyl alcohol at the temperature according to the ambient temperature and the solubility temperature model, thereby obtaining a corresponding amount of polyvinyl alcohol solid, and obtains an image of the polyvinyl alcohol solid dissolution process, processes the dissolution image, calculates the dissolution rate of polyvinyl alcohol, and improves the accuracy of polyvinyl alcohol dissolution rate measurement;

[0056] The present invention obtains multiple sets of polyvinyl alcohol solubility and temperature data to determine a solubility temperature model, which is beneficial to the selection of the amount of polyvinyl alcohol in the process of measuring the solubility rate of polyvinyl alcohol and improves the accuracy of the measurement of the solubility rate of polyvinyl alcohol.

[0057] The present invention calculates the solubility of polyvinyl alcohol by high performance liquid chromatography, thereby improving the accuracy of the solubility calculation of polyvinyl alcohol and providing a data basis for determining the solubility temperature model parameters;

[0058] The invention performs gray value and binarization processing on the dissolution image and adopts the box counting method to calculate the fractal dimension, thereby reducing the complexity of the fractal dimension calculation and providing a data basis for the measurement of the solubility of polyvinyl alcohol.

[0059] The present invention compares the histogram data of the gray value images and removes the gray value images with the same histogram data, which is beneficial to the processing of the dissolution image and the calculation of the fractal dimension, and improves the accuracy of the measurement of the dissolution rate of polyvinyl alcohol.

[0060] The present invention processes the dissolution image and calculates the dissolution rate of polyvinyl alcohol according to the time when the dissolution image occurs and the change of the edge of polyvinyl alcohol, thereby improving the accuracy of the measurement of the dissolution rate of polyvinyl alcohol. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0062] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0063] Figure 1 A schematic diagram of a process for measuring the solubility rate of polyvinyl alcohol provided in this embodiment;

[0064] Figure 2 A schematic diagram of a process for obtaining polyvinyl alcohol solids according to the ambient temperature and solubility temperature model provided in this embodiment;

[0065] Figure 3 A schematic diagram of a process for measuring the solubility of polyvinyl alcohol provided in this embodiment;

[0066] Figure 4 A schematic diagram of a process for calculating the fractal dimension of a dissolution image provided in this embodiment;

[0067] Figure 5 A schematic diagram of a process for preprocessing a grayscale image according to histogram data provided in this embodiment;

[0068] Figure 6 A schematic diagram of a process for calculating the dissolution rate of polyvinyl alcohol based on fractal dimension provided in this embodiment;

[0069] Figure 7 A schematic diagram of the structure of a polyvinyl alcohol solubility rate measurement system provided in this embodiment;

[0070] Figure 8 A schematic diagram of the structure of an electronic device provided in this embodiment. DETAILED DESCRIPTION

[0071] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0073] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0074] This embodiment provides a method for measuring the solubility rate of polyvinyl alcohol. Figure 1 As shown, the following steps are included:

[0075] S1, obtain the ambient temperature;

[0076] S2, obtaining polyvinyl alcohol solid according to the ambient temperature and solubility temperature model;

[0077] S3, dissolving the polyvinyl alcohol solid in water to form a polyvinyl alcohol aqueous solution;

[0078] S4, acquiring a dissolution image of the polyvinyl alcohol aqueous solution at a fixed time frequency;

[0079] S5, calculating the fractal dimension of the dissolution image;

[0080] S6. Calculate the dissolution rate of polyvinyl alcohol based on the fractal dimension.

[0081] It should be noted that the ambient temperature of step S1 is the temperature of the polyvinyl alcohol dissolution process, and the solubility temperature model of step S2 can calculate the solubility at this temperature according to the input temperature. The ambient temperature can be obtained by setting a temperature sensor inside the container, so as to calculate the solubility of polyvinyl alcohol at ambient temperature according to the solubility temperature model. This is to take into account that in the preparation process of polyvinyl alcohol products, it is necessary to control the uniform dissolution of polyvinyl alcohol. At the same time, in the process of calculating the dissolution rate by the dissolution image of polyvinyl alcohol, when the mass of polyvinyl alcohol exceeds the solubility, polyvinyl alcohol cannot be completely dissolved, affecting the subsequent image processing, and also reducing the actual calculated overall dissolution rate. Therefore, in order to improve the accuracy of the measurement of the dissolution rate of polyvinyl alcohol, the solubility of polyvinyl alcohol is determined using the solubility temperature model, so as to obtain the corresponding amount of polyvinyl alcohol solids. Step S4 obtains the dissolution image of the polyethylene aqueous solution at a fixed time frequency to obtain a dissolution image sequence. In some embodiments, the video data of the dissolution process can be obtained by a high-definition camera, and the video data is segmented to obtain a dissolution image sequence. The fractal dimension of step S5 reflects the change of the edge of the polyvinyl alcohol solid, which is used for the subsequent calculation of the dissolution rate of polyvinyl alcohol.

[0082] In this embodiment, the solubility of polyvinyl alcohol at the ambient temperature and the solubility temperature model is obtained to obtain the corresponding amount of polyvinyl alcohol solid. By obtaining an image of the dissolution process of the polyvinyl alcohol solid, the dissolution image is processed and the dissolution rate of the polyvinyl alcohol is calculated, thereby improving the accuracy of the measurement of the polyvinyl alcohol solubility rate.

[0083] In some embodiments, before obtaining the polyvinyl alcohol solid according to the ambient temperature and the solubility temperature model, step S2 further includes: step S0, fitting the solubility temperature model; Figure 2 As shown, the specific steps include:

[0084] S01, obtaining a certain amount of polyvinyl alcohol;

[0085] S02, dissolving polyvinyl alcohol in water and waiting for several hours in a constant temperature environment;

[0086] S03, measuring the solubility of polyvinyl alcohol;

[0087] S04, obtaining solubility and temperature data of several groups of polyvinyl alcohol;

[0088] S05. Determine parameters of a solubility temperature model according to the solubility and temperature of the polyvinyl alcohol.

[0089] The formula of the solubility temperature model is as follows:

[0090] ,

[0091] in, is the solubility of polyvinyl alcohol, is the molar mass of polyvinyl alcohol, is the first fitting parameter, is the second fitting parameter, For temperature.

[0092] It should be noted that the solubility temperature model includes the first fitting parameter and the second fitting parameter , for the first fitting parameter and the second fitting parameter The determination is made by fitting multiple sets of solubility and temperature data. Specifically, a certain amount of polyvinyl alcohol is obtained, and the polyvinyl alcohol aqueous solution is placed in a constant temperature environment and waits for a period of time until the polyvinyl alcohol stops dissolving, and the solubility of the polyvinyl alcohol is measured while the temperature controlled by the constant temperature is obtained, so as to obtain a set of solubility and temperature data. Repeat the above measurement steps, and obtain multiple sets of polyvinyl alcohol solubility and temperature data by controlling different temperatures. The parameters of the solubility temperature model are determined by multiple sets of polyvinyl alcohol solubility and temperature data.

[0093] In this embodiment, by acquiring multiple sets of polyvinyl alcohol solubility and temperature data and determining a solubility-temperature model, it is beneficial to select the amount of polyvinyl alcohol in the process of measuring the solubility rate of polyvinyl alcohol and improve the accuracy of the solubility rate measurement of polyvinyl alcohol.

[0094] In some embodiments, step S03, measuring the solubility of polyvinyl alcohol, such as Figure 3 As shown, the following steps are included:

[0095] S031, obtaining the upper aqueous solution;

[0096] S032, filtering the upper aqueous solution to obtain a sample solution;

[0097] S033, analyzing the sample solution by high performance liquid chromatography to obtain the solubility of polyvinyl alcohol.

[0098] It should be noted that high performance liquid chromatography can separate, identify and quantify the various components in the solution, and is used to assist in determining the solubility of polyvinyl alcohol in water. Specifically, taking into account the situation where it is not completely dissolved, the upper aqueous solution is used and the upper aqueous solution is filtered to remove the undissolved polyvinyl alcohol solid particles. When performing solubility analysis, it is necessary to obtain a standard solution of known concentration, and by comparing the response values ​​of the sample solution and the standard solution, the dissolved amount of polyvinyl alcohol is obtained, thereby calculating the solubility of polyvinyl alcohol.

[0099] In this embodiment, the solubility of polyvinyl alcohol is calculated by high performance liquid chromatography, which improves the accuracy of the solubility calculation of polyvinyl alcohol and provides a data basis for determining the solubility temperature model parameters.

[0100] In some embodiments, step S5, the fractal dimension of the dissolution image is calculated, such as Figure 4 As shown, the following steps are included:

[0101] S51, performing gray value processing on the dissolution image to obtain a gray value image;

[0102] S52, obtaining histogram data of the gray value image;

[0103] S53, preprocessing the gray value image according to the histogram data;

[0104] S54, performing binarization processing on the gray value image to obtain a binarized image;

[0105] S55, calculating the fractal dimension using a box counting method based on the binarized image.

[0106] It should be noted that the box counting method is used to calculate the fractal dimension of the dissolution image, and the dissolution image can be processed by grayscale value and binarization. The box counting method is relatively more intuitive and easy to calculate the fractal dimension of the binary image. Specifically, an initial size is selected, and a box of this size is placed at the image position where the polyvinyl alcohol solid is located, and the number of boxes is counted. The size of the box is reduced, and the above steps are repeated to obtain multiple sets of box quantity and box size data. The corresponding curve is drawn with the logarithm of the number of boxes as the vertical axis and the logarithm of the box size as the horizontal axis. The slope of the curve obtained by fitting is the fractal dimension of the binary image.

[0107] In this embodiment, the fractal dimension is calculated by grayscale and binarization processing of the dissolution image using a box counting method, thereby reducing the complexity of the fractal dimension calculation and providing a data basis for the measurement of the solubility of polyvinyl alcohol.

[0108] In some embodiments, step S53 pre-processes the grayscale image according to the histogram data, such as Figure 5 As shown, the following steps are included:

[0109] S531, sorting the gray value images according to the acquisition time of the gray value images to obtain a gray value image sequence;

[0110] S532, comparing adjacent grayscale value images in the grayscale value image sequence;

[0111] S533, removing grayscale value images with the same histogram data.

[0112] It should be noted that the gray value image is preprocessed to remove the dissolution image without adding polyvinyl alcohol and the dissolution image after the dissolution is stopped. Specifically, the gray value images are sorted according to the acquisition time of the gray value images, and when the histogram data of adjacent gray value images are the same, the redundant gray value images are removed.

[0113] In this embodiment, by comparing the histogram data of the gray value images and removing the gray value images with the same histogram data, it is beneficial to the processing of the dissolution image and the calculation of the fractal dimension, thereby improving the accuracy of the measurement of the dissolution rate of polyvinyl alcohol.

[0114] In some embodiments, step S6, the dissolution rate of polyvinyl alcohol is calculated according to the fractal dimension, such as Figure 6 As shown, the following steps are included:

[0115] S61, obtaining a sequence value of a dissolution image;

[0116] S62, calculating the dissolution time according to the sequence value;

[0117] S63, summing the fractal dimensions to obtain a total fractal dimension;

[0118] S64, calculating the dissolution rate of polyvinyl alcohol according to the sum of the dissolution time and the fractal dimension;

[0119] The calculation formula of the dissolution rate of polyvinyl alcohol is as follows:

[0120] ,

[0121] in, is the dissolution rate of polyvinyl alcohol, is the sum of fractal dimensions, is the dissolution time.

[0122] It should be noted that the sequence value is an element in a series of image data arranged in a certain order, and the dissolution time is the time from the first dissolution image to the dissolution image, which can be calculated based on the sequence value of the dissolution image. Specifically, the sequence value is sorted according to the acquisition time, so the dissolution time is obtained by multiplying the sequence value according to the pre-set fixed time frequency. Summing the fractal dimension is to sum the fractal dimensions of the image corresponding to the sequence value and the image before the sequence value.

[0123] In this embodiment, the dissolution image is processed, and the dissolution rate of the polyvinyl alcohol is calculated according to the time when the dissolution image occurs and the change of the edge of the polyvinyl alcohol, thereby improving the accuracy of the measurement of the dissolution rate of the polyvinyl alcohol.

[0124] This embodiment provides a polyvinyl alcohol solubility rate measurement system, which applies the above-mentioned polyvinyl alcohol solubility rate measurement method, such as Figure 7 As shown, it includes: a temperature acquisition module, a solid acquisition module, a solution formation module, an image acquisition module, an image processing module and a data processing module;

[0125] Temperature acquisition module, used to obtain ambient temperature;

[0126] A solid acquisition module, used for acquiring polyvinyl alcohol solid according to the ambient temperature and the solubility temperature model;

[0127] A solution forming module, used for dissolving polyvinyl alcohol solid in water to form a polyvinyl alcohol aqueous solution;

[0128] An image acquisition module, used for acquiring a dissolution image of the polyvinyl alcohol aqueous solution at a fixed time frequency;

[0129] An image processing module for calculating the fractal dimension of the dissolution image;

[0130] The data processing module is used to calculate the dissolution rate of polyvinyl alcohol according to the fractal dimension.

[0131] In this embodiment, the solubility of polyvinyl alcohol at the ambient temperature and the solubility temperature model is obtained to obtain the corresponding amount of polyvinyl alcohol solid. By obtaining an image of the dissolution process of the polyvinyl alcohol solid, the dissolution image is processed and the dissolution rate of the polyvinyl alcohol is calculated, thereby improving the accuracy of the measurement of the polyvinyl alcohol solubility rate.

[0132] It should be understood that the disclosed system can be implemented in other ways. For example, the system embodiments described above are merely schematic. For example, the division of the above modules is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, each functional module can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0133] This embodiment provides an electronic device 2, such as Figure 8 As shown, a processor 21 and a memory 22, the memory 22 is used to store computer program codes, the computer program codes include computer instructions, when the processor 21 executes the computer instructions, the electronic device executes the above-mentioned polyvinyl alcohol solubility rate measurement method.

[0134] The electronic device 2 includes a processor 21, a memory 22, an output device 23, and an input device 24. The processor 21, the memory 22, the output device 23, and the input device 24 are coupled via a connector, and the connector includes various interfaces, transmission lines, or buses, etc., which are not limited in the embodiments of the present invention. It should be understood that in various embodiments of the present invention, coupling refers to mutual connection in a specific manner, including direct connection or indirect connection through other devices, for example, through various interfaces, transmission lines, buses, etc.

[0135] The processor 21 may be one or more graphics processing units (GPUs). When the processor 21 is a GPU, the GPU may be a single-core GPU or a multi-core GPU. Optionally, the processor 21 may be a processor group consisting of multiple GPUs, and the multiple processors are coupled to each other via one or more buses. Optionally, the processor 21 may also be other types of processors, etc., which are not limited in the embodiments of the present invention.

[0136] The memory 22 can be used to store computer program instructions and various computer program codes including program codes for executing the scheme of the present invention. Optionally, the memory 22 includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable read only memory (EPROM), or portable read only memory (CD-ROM), and the memory 22 is used for related instructions and data.

[0137] The input device 24 is used to input data and / or signals, and the output device 23 is used to output data and / or signals. The output device 23 and the input device 24 can be independent devices or an integrated device.

[0138] This embodiment provides a computer-readable storage medium, in which a computer program is stored. The computer program includes program instructions. When the program instructions are executed by a processor of an electronic device, the processor executes the above-mentioned method for measuring the solubility rate of polyvinyl alcohol.

[0139] The above are only specific embodiments of the present invention, which enable those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for measuring the solubility rate of polyvinyl alcohol, comprising the following steps: Get the ambient temperature; According to the ambient temperature and the solubility temperature model, obtaining polyvinyl alcohol solid; dissolving the polyvinyl alcohol solid in water to form a polyvinyl alcohol aqueous solution; Acquiring a dissolution image of the polyvinyl alcohol aqueous solution at a fixed time frequency; calculating the fractal dimension of the dissolution image; Calculating the dissolution rate of polyvinyl alcohol according to the fractal dimension; The solubility temperature model is expressed as follows: ， in, is the solubility of polyvinyl alcohol, is the molar mass of polyvinyl alcohol, is the first fitting parameter, is the second fitting parameter, is temperature; The step of calculating the fractal dimension of the dissolution image comprises the following steps: Performing gray value processing on the dissolution image to obtain a gray value image; Acquire histogram data of the grayscale value image; Preprocessing the grayscale image according to the histogram data; Binarizing the preprocessed grayscale image to obtain a binary image; Calculating the fractal dimension using a box counting method according to the binary image; The preprocessing of the grayscale image according to the histogram data comprises the following steps: Sorting the grayscale images according to the acquisition time of the grayscale images to obtain a grayscale image sequence; Comparing the adjacent grayscale value images in the grayscale value image sequence; The grayscale value images having the same histogram data are removed.

2. A method for measuring the solubility rate of polyvinyl alcohol according to claim 1, characterized in that: Before obtaining the polyvinyl alcohol solid according to the ambient temperature and the solubility temperature model, the method further includes: fitting the solubility temperature model; specifically, the following steps: Obtaining a quantity of polyvinyl alcohol; Dissolve the polyvinyl alcohol in water and wait for several hours in a constant temperature environment; measuring the solubility of the polyvinyl alcohol; Acquiring several sets of solubility and temperature data of the polyvinyl alcohol; The parameters of the solubility temperature model are determined according to the solubility of the polyvinyl alcohol and the temperature.

3. A method for measuring the solubility rate of polyvinyl alcohol according to claim 2, characterized in that: The solubility measurement of the polyvinyl alcohol comprises the following steps: obtaining an upper aqueous solution; filtering the upper aqueous solution to obtain a sample solution; The sample solution is analyzed by high performance liquid chromatography to obtain the solubility of the polyvinyl alcohol.

4. A method for measuring the solubility rate of polyvinyl alcohol according to claim 1, characterized in that: The method of calculating the dissolution rate of polyvinyl alcohol according to the fractal dimension comprises the following steps: Obtaining a sequence value of the dissolve image; According to the sequence value, the dissolution time is calculated; Summing the fractal dimensions to obtain a fractal dimension sum; Calculating the dissolution rate of the polyvinyl alcohol according to the dissolution time and the sum of the fractal dimensions; The calculation formula of the dissolution rate of polyvinyl alcohol is as follows: ， in, is the dissolution rate of polyvinyl alcohol, is the sum of fractal dimensions, is the dissolution time.

5. A polyvinyl alcohol solubility rate measurement system, using a polyvinyl alcohol solubility rate measurement method as claimed in any one of claims 1 to 4, characterized in that: include: A temperature acquisition module, a solid acquisition module, a solution formation module, an image acquisition module, an image processing module and a data processing module; The temperature acquisition module is used to acquire the ambient temperature; The solid acquisition module is used to acquire polyvinyl alcohol solid according to the ambient temperature and the solubility temperature model; The solution forming module is used to dissolve the polyvinyl alcohol solid in water to form a polyvinyl alcohol aqueous solution; The image acquisition module is used to acquire the dissolution image of the polyvinyl alcohol aqueous solution at a fixed time frequency; The image processing module is used to calculate the fractal dimension of the dissolution image; The data processing module is used to calculate the dissolution rate of polyvinyl alcohol according to the fractal dimension; The solubility temperature model is expressed as follows: ， in, is the solubility of polyvinyl alcohol, is the molar mass of polyvinyl alcohol, is the first fitting parameter, is the second fitting parameter, is temperature; The step of calculating the fractal dimension of the dissolution image comprises the following steps: Performing gray value processing on the dissolution image to obtain a gray value image; Acquire histogram data of the grayscale value image; Preprocessing the grayscale image according to the histogram data; Binarizing the preprocessed grayscale image to obtain a binary image; Calculating the fractal dimension using a box counting method according to the binary image; The preprocessing of the grayscale image according to the histogram data comprises the following steps: Sorting the grayscale images according to the acquisition time of the grayscale images to obtain a grayscale image sequence; Comparing the adjacent grayscale value images in the grayscale value image sequence; The grayscale value images having the same histogram data are removed.

6. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein the memory is used to store computer program codes, and the computer program codes include computer instructions. When the processor executes the computer instructions, the electronic device executes a polyvinyl alcohol solubility rate measurement method as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor of an electronic device, the processor executes a polyvinyl alcohol solubility rate measurement method as described in any one of claims 1 to 4.

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