Device for detecting hydrophilicity

Abstract

The utility model discloses equipment for detecting the hydrophilicity of an auxiliary agent, which comprises a balance with the precision of one ten thousandth, and the balance can be used for accurately detecting the weight of a sample; the stirring paddle is arranged in the balance scale tray and is in a cross shape; the heater is arranged at the bottom of the weighing tray of the balance scale and can accurately control the heating temperature and duration; the sealing tank is vertically and hermetically arranged above the balance scale, and a discharge port and a water inlet are formed in the upper part of the sealing tank; the pure water tank is arranged at the edge of the balance and is connected with the water inlet of the tank body through a sealing water pipe; the curve display instrument can be used for setting the stirring duration, the pure water proportion, the heating duration and a weight change curve during sample detection; the utility model has the following advantages and effects: by arranging the curve display instrument, the optimum dehydration temperature of the assistant can be quickly expressed, the operation is simple and accurate, and multiple equipment and multiple operations are not needed; compared with conventional contact angle detection of hydrophilic performance, the method is more efficient, accurate, convenient and rapid.

Description

Technical Field

[0001] This utility model belongs to the field of hydrophilicity detection technology, specifically relating to a device for detecting hydrophilicity and its usage method. Background Technology

[0002] Polymer materials are widely used in industry and agriculture. However, some polymer material additives contain hydrophilic molecules such as ROH (alcohols), RCOOH (carboxylic acids), R2C=O (ketones), and RCONH2 (amides). Based on the principle of similarity and compatibility of hydrophilic groups in light stabilizers, water molecules have strong hydrogen bonds. Water molecules can both provide hydrogen atoms to form hydrogen bonds and accept hydrogen atoms from other molecules due to the lone pair electrons on their oxygen atoms. Hydrogen bonds are the main binding force between water molecules. Therefore, any solute molecule that can provide or accept hydrogen for hydrogen bonding is structurally similar to water.

[0003] This can lead to many unnecessary process errors during processing. Compared to the traditional method of measuring the contact angle to determine hydrophilicity, there are many uncontrollable factors involved, such as the water droplet mass, the droplet drop height, and the steps involved in determining the contact angle curve. Summary of the Invention

[0004] To address the aforementioned problems, this utility model discloses a novel device for detecting hydrophilicity and its method of use.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] This utility model provides a device for detecting hydrophilicity, comprising:

[0007] The support frame is placed horizontally on the table. A hydrophilicity detection unit is set on one side of the upper surface of the support frame, and a pure water tank is set on the other side. The height of the support frame at the bottom of the pure water tank is higher than the height of the support frame at the bottom of the hydrophilicity detection unit. Placing the pure water tank (9) at a high position makes it easier to remove air bubbles in the pipe and avoid the disadvantage of not being able to inject water in case of malfunction.

[0008] The hydrophilicity testing unit includes a sealed container, a heater, and a balance.

[0009] The balance scale is placed inside the support frame, and the weighing tray of the balance scale protrudes from the surface of the support frame;

[0010] The sealed container is vertically and sealed outside the weighing tray of the balance scale. The top of the sealed container is equipped with a discharge port and a water inlet. The bottom of the sealed container is equipped with an internal thread groove, and the support frame is equipped with an annular groove. The inner wall of the annular groove is equipped with an external thread that matches the internal thread. The sealed container is threadedly connected to the support frame, and a rubber ring is provided at the connection between the sealed container and the support frame. The rubber ring is placed inside the internal thread groove.

[0011] The tank fixing bracket is placed outside the tank and bolted to the bottom of the support frame.

[0012] An electric heater is installed below the weighing tray;

[0013] The stirring paddle is set on the upper surface of the weighing tray in a cross shape. The stirring paddle is placed on top of the stirring shaft, which runs through the weighing tray. The bottom of the stirring shaft is connected to the motor, which is placed inside the support frame.

[0014] A pure water tank is connected to its inlet by a sealed water pipe.

[0015] The curve display instrument is connected to the balance, motor, quantitative water addition device, and electric heater via wires. The curve display instrument can set the stirring time, pure water ratio, heating time, and the weight change curve of the sample during testing. The curve is plotted with time on the horizontal axis and mass on the vertical axis.

[0016] The motor is located below the weighing tray and uses a small electric drive motor, which is fixed inside the machine body to reduce internal space usage, facilitates installation, and will not affect the use of the heater.

[0017] Furthermore, a metering device is connected between the sealed water pipe and the pure water tank, which can accurately add pure water according to the specified ratio.

[0018] Furthermore, the rubber ring is a rubber ring or a silicone ring.

[0019] Furthermore, the sealed container is made of transparent glass, allowing clear observation of the contents and the state of the sample mixed with water. During use, experimental errors and malfunctions of internal parts are inevitable; the transparent glass material facilitates timely detection and handling.

[0020] Furthermore, a drip pipe is installed at the top of the sealed container. One end of the drip pipe is connected to the water inlet, and the other end is placed inside the sealed container. The water flow is precisely controlled according to the drip pipe and the metering water addition device to control the required amount of water. This not only avoids the error of manual operation but also controls the amount of water more accurately, greatly reducing the experimental cycle.

[0021] Furthermore, the distance between the cross-shaped stirring paddle and the upper surface of the weighing tray is 3-5 mm.

[0022] Furthermore, an annular baffle is provided at the edge of the upper surface of the weighing tray.

[0023] The method of using the hydrophilicity detection device of this invention includes: uniformly grinding the test sample into powder, ensuring that the test sample is dry and free of moisture, thus ensuring the accuracy of the test. The expected weight is within the range of 1-3g.

[0024] Place the sample into the weighing pan, ensuring the container is sealed. Add water in small amounts several times while stirring slowly. The moisture content is expected to be between 50% and 12% of the sample weight.

[0025] The balance contains a cross-shaped automatic stirrer, which effectively spreads the sample evenly, allowing the water droplets on top to fully mix and blend with the sample. The bottom of the weighing pan has an automatic heater. The temperature is set to a suitable drying temperature (far below the sample's melting point) for heating treatment. The change in the sample's water loss curve is observed from the graph. The experiment ends 15 minutes after the curve stabilizes, effectively avoiding unnecessary sample loss during transfer using weighing instruments and allowing for more accurate experiments. Preferably, the drying temperature is set at 35℃.

[0026] The beneficial effects of this utility model are as follows:

[0027] The balance described in this invention has a cross-shaped automatic stirrer inside, which can effectively spread the sample evenly and allow the water droplets on top to fully mix with the sample. Its weighing pan has an automatic heater at the bottom, effectively avoiding unnecessary sample loss during transfer using weighing instruments, allowing for more accurate experiments.

[0028] The sealing tank described in this utility model has a detachable tank body with a threaded connection for easy disassembly. The connection between the sealing tank and the support frame is sealed with a rubber ring in the middle, which facilitates disassembly and maintenance and also helps to clean internal stains. There is a metering water dispenser device at the top center of the sealing tank, which can accurately add pure water in proportion.

[0029] The curve display instrument described in this invention can display the changes in the weight of the sample inside the test sample in real time and show them in the form of a curve. It can also control the steps such as test time, test temperature, and water addition ratio, so as to express the hydrophilic properties of the sample more intuitively and accurately.

[0030] The detection method of this utility model's hydrophilicity detection device is based on the principle of "like dissolves like," which means that the sample adsorbs water based on its hydrophilicity. Then, a modified method of thermogravimetric analysis is used to determine the hydrophilicity of the sample. This utility model's hydrophilicity detection device can quickly and qualitatively determine the hydrophilicity of a sample. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the device for detecting hydrophilicity according to this utility model;

[0032] Figure 2 This is a partial internal structural diagram of the device for detecting hydrophilicity according to this utility model;

[0033] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0034] Figure 4This is a contact angle diagram of the sample in Embodiment 2 of the present invention;

[0035] Figure 5 This is a contact angle diagram of the sample in Embodiment 3 of the present invention.

[0036] List of identifiers in attached diagrams:

[0037] 1. Balance scale; 2. Cross-shaped agitator; 3. Weighing pan; 4. Tank mounting bracket; 5. Sealed water pipe; 6. Sealed tank; 7. Electric heater; 8. Rubber ring; 9. Pure water tank. Detailed Implementation

[0038] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. Example 1

[0039] like Figure 1-3 As shown, a novel hydrophilicity testing device includes a support frame 1, an electric heater 7, a pure water tank 9, a sealed tank 6, a motor, a stirring paddle 2, and a curve display instrument 12.

[0040] Support frame 1 is placed horizontally on a table. A hydrophilicity testing unit is set on one side of the upper surface of support frame 1, and a pure water tank 9 is set on the other side. The height of the support frame at the bottom of the pure water tank 9 is higher than the height of the support frame at the bottom of the hydrophilicity testing unit. Placing the pure water tank 9 at a high position makes it easier to remove air bubbles in the tube and avoid the disadvantage of not being able to fill water in case of malfunction. The hydrophilicity testing unit includes a sealed tank 6, a heater 7, and a balance.

[0041] The balance scale is placed inside the support frame 1, and the weighing tray 3 of the balance scale protrudes from the surface of the support frame 1.

[0042] The sealed container 6 is vertically sealed outside the weighing tray 3 of the balance scale. The top of the sealed container 6 is provided with a discharge port and a water inlet. The bottom of the sealed container 6 is provided with a threaded groove. The support frame 1 is provided with an annular groove. The inner wall of the annular groove is provided with an external thread that matches the internal thread. The sealed container 6 is threadedly connected to the support frame 1, and a rubber ring 8 is provided at the connection between the sealed container 6 and the support frame 1.

[0043] The tank fixing frame 4 is placed outside the sealed tank 6 and its bottom is bolted to the support frame 1;

[0044] Electric heater 7 is located below weighing tray 3;

[0045] The stirring paddle 2 is set on the upper surface of the weighing tray 3 in a cross shape. The stirring paddle 2 is placed on top of the stirring shaft, which passes through the weighing tray 3. The bottom of the stirring shaft is connected to the motor, which is placed inside the support frame 1.

[0046] Pure water tank 9 is connected to the inlet of sealed tank 6 by sealed water pipe 5;

[0047] The curve display instrument is connected to the balance, motor, quantitative water addition device, and electric heater via wires. The curve display instrument can set the stirring time, pure water ratio, heating time, and the weight change curve of the sample during testing. The curve is plotted with time on the horizontal axis and mass on the vertical axis.

[0048] The motor is located below the weighing tray 3 and uses a small electric drive motor, which is fixed inside the machine body to reduce the use of internal space, facilitates installation, and will not affect the use of the heater.

[0049] As a specific embodiment of this utility model, a metering water adding device is connected between the sealed water pipe 5 and the pure water tank 9.

[0050] In one specific embodiment of this utility model, the rubber ring 8 is a rubber ring or a silicone ring.

[0051] In one specific embodiment of this utility model, the sealed container 6 is made of transparent glass.

[0052] As a specific embodiment of this utility model, a drip pipe is provided at the top of the inside of the sealed container 6. One end of the drip pipe is connected to the water inlet, and the other end is placed inside the sealed container 6.

[0053] In one specific embodiment of this utility model, the distance between the bottom end of the cross-shaped stirring paddle 2 and the upper surface of the weighing tray 3 is 3-5 mm.

[0054] The sealed tank 6 is a detachable tank body. The connection between the sealed tank 6 and the support frame 1 is sealed with a rubber ring 8 in the middle. The sealed tank 6 and the support frame 1 are connected by threads, which facilitates disassembly and maintenance and is also conducive to cleaning internal stains. There is a metering water dispenser device at the top center of the sealed tank 6, which can accurately add pure water according to the ratio.

[0055] The curve display instrument can display the changes in the internal weight of the sample in real time and show them as a curve. It can also control the steps such as detection time, detection temperature, and water addition ratio, so as to express the hydrophilic properties of the sample more intuitively and accurately.

[0056] Working principle:

[0057] This device primarily utilizes thermogravimetric analysis (TGA). Based on the sample's melting point, a suitable drying temperature is set, but significantly lower than the sample's melting point. Due to the principle of "like dissolves like," the sample is ensured to be in full contact with pure water before heating. This equipment facilitates accurate determination of the sample's hydrophilicity, precisely determining the volume of pure water to add, preventing errors from manual operation. Later, the fluctuations in the curve displayed on the instrument allow for precise assessment of water loss during heating. By setting a specific timeframe and allowing the sample to stabilize internally, the weight of the remaining water can be used to determine the sample's hydrophilicity. Example 2

[0058] The specific steps in this embodiment are as follows:

[0059] Weigh 1-3g of HALS770 and grind it to ensure the sample appears as a white, fine powder. Place it in a vacuum drying oven and pre-treat it at 30℃ for 2 hours to ensure the sample is dry and free of moisture. Then, at room temperature, place it evenly in the hydrophilicity testing device, weigh it, and record the weight. Next, start the device and add pure water at half the weight of the sample, adding a small amount slowly every 5 seconds while simultaneously stirring at low speed to ensure uniform mixing. After all the pure water has been added, continue stirring for 10 minutes to ensure homogeneous mixing. Then, heat the sample at 35℃ and observe the change in the water loss curve. The experiment ends 15 minutes after the curve stabilizes.

[0060] Simultaneously, weigh 0.5 parts of HALS770, 0.2 parts of antioxidant B215, and 99.3 parts of resin PE-1820, and add them to a mixing tank for mixing. Then, granulate the mixture using a Koya 36 extruder. After obtaining the finished masterbatch, hand-mix it evenly and let it stand for 24 hours to ensure the masterbatch is stable. Then, use a Haitian injection molding machine to make samples, ensuring the sample surface is flat and free of impurities. After storing for 48 hours to ensure the sample is stable, perform a contact angle test. Figure 4 As shown in the figure. The experimental data from both methods are also compared (see Table 1). Example 3

[0061] The specific steps in this embodiment are as follows:

[0062] Weigh 1-3g of UV326 and grind it to ensure the sample appears as a white, fine powder. Place it in a vacuum drying oven and pre-treat it at 30℃ for 2 hours to ensure the sample is dry and free of moisture. Then, at room temperature, place it evenly in the hydrophilicity testing apparatus, weigh it, and record the weight. Next, start the apparatus and add pure water at half the sample weight, adding a small amount slowly every 5 seconds while simultaneously stirring at low speed to ensure uniform mixing. After all the pure water has been added, continue stirring for 10 minutes to ensure homogeneous mixing. Then, heat the sample at 35℃ and observe the change in water loss curve. After the curve stabilizes, end the experiment 15 minutes later and record the sample weight.

[0063] Simultaneously, weigh 0.5 parts of UV326, 0.2 parts of antioxidant B215, and 99.3 parts of resin PE-1820, and add them to a mixing tank for mixing. Then, granulate the mixture using a Koya 36 extruder. After obtaining the finished masterbatch, hand-mix it evenly and let it stand for 24 hours to ensure the masterbatch is stable. Then, use a Haitian injection molding machine to make samples, ensuring the sample surface is flat and free of impurities. After storing for 48 hours to ensure the sample is stable, perform a contact angle test. Figure 5 As shown in the figure. The experimental data from both methods are also compared (see Table 1).

[0064] The hydrophilicity was tested according to GB / T 30693-2014 and ASTM D7490-13, and the test results are shown in Table 1:

[0065] Table 1:

[0066] sample Contact angle Increase in sample weight (%) Example 2 45.586° 35.33% Example 3 96.633° 0.62%

[0067] The data results from Examples 1 and 2 in Table 1 are largely consistent with the contact angle experiment results: a significant increase in sample weight indicates that the sample is compatible with pure water and does not easily lose moisture, thus exhibiting strong hydrophilicity; a slight increase or no increase in sample weight indicates that the sample is incompatible with pure water and easily loses moisture, thus exhibiting weak hydrophilicity. In practical applications, this significantly shortens the time required for contact data collection and reduces the amount of experimental equipment needed, thereby lowering the actual cost of hydrophilicity testing.

[0068] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. A device for detecting hydrophilicity, characterized in that, include: A support frame (1) is placed horizontally on a table. A hydrophilicity testing unit is provided on one side of the upper surface of the support frame (1), and a pure water tank (9) is provided on the other side. The hydrophilicity testing unit includes a sealed tank (6), an electric heater (7), and a balance. The balance scale is placed inside the support frame, and the weighing tray (3) of the balance scale protrudes from the surface of the support frame (1); The sealed container (6) is vertically sealed outside the weighing tray (3) of the balance scale. The top of the sealed container (6) is provided with a discharge port and a water inlet. The bottom of the sealed container (6) is provided with an internal thread groove. The support frame (1) is provided with an annular groove. The inner wall of the annular groove is provided with an external thread that matches the internal thread. The sealed container (6) is threadedly connected to the support frame (1), and a rubber ring (8) is provided at the connection between the sealed container (6) and the support frame (1). The tank fixing frame (4) is placed outside the sealed tank (6) and its bottom is bolted to the support frame (1); An electric heater (7) is installed below the weighing tray (3); The stirring paddle (2) is set on the upper surface of the weighing tray (3) in a cross shape. The stirring paddle (2) is placed on the top of the stirring shaft, which passes through the weighing tray (3). The bottom of the stirring shaft is connected to the motor, which is placed inside the support frame (1). Pure water tank (9) is connected to the inlet of sealed tank (6) by sealed water pipe (5).

2. The device for detecting hydrophilicity according to claim 1, characterized in that, A metering water supply device is connected between the sealed water pipe (5) and the pure water tank (9).

3. The device for detecting hydrophilicity according to claim 1, characterized in that, The rubber ring (8) is a rubber ring or a silicone ring.

4. The device for detecting hydrophilicity according to claim 1, characterized in that, The sealed container (6) is made of transparent glass.

5. The device for detecting hydrophilicity according to claim 1, characterized in that, A drip pipe is provided at the top of the inside of the sealed container (6), and the drip pipe is connected to the water inlet placed inside the sealed container (6).

6. The device for detecting hydrophilicity according to claim 1, characterized in that, The distance between the bottom of the stirring paddle (2) and the upper surface of the weighing tray (3) is 3mm~5mm.

7. The device for detecting hydrophilicity according to claim 1, characterized in that, An annular baffle is provided at the edge of the upper surface of the weighing tray (3).

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