Phase change fabric bidirectional temperature regulation performance test method

Abstract

The invention provides a phase change fabric two-way temperature adjustment performance testing method, and belongs to the technical field of fabric temperature adjustment performance testing, and the method comprises the following steps: S1, equipment and instrument preparation; s2, fabric enthalpy value determination and fabric preparation; S3, two-way temperature adjustment testing; and S4, evaluating the temperature regulation performance. The temperature adjusting capability of the fabric is measured through temperature changes, the method is more visual and easier to understand, and consumers can conveniently distinguish the temperature adjusting performance of the fabric.

Description

Technical Field

[0001] The invention relates to the technical field of fabric temperature regulation performance testing, and in particular to a method for testing the bidirectional temperature regulation performance of a phase change fabric. Background Art

[0002] As the most traditional material for human clothing, textile materials have the basic function of ensuring the health and comfort of the wearer. However, with the influence of the wearer's activities and environmental changes, clothing has an additional positive role in adapting to changes in physiological needs. This function is called "active comfort regulation". Among the textiles that can intelligently adjust the temperature according to changes in the external environment, phase change thermoregulating textiles are undoubtedly the most effective and economical. Thermoregulating fabrics can freely adjust the temperature within a certain temperature range when the external environment temperature rises. When the temperature of the external environment rises, it can store energy and slow down the temperature increase; when the temperature drops, it can release energy and slow down the temperature drop, thereby improving the comfort of the textile. It has a significant effect on improving thermal comfort and wearability.

[0003] However, the current testing of phase-change temperature-regulating fabrics is limited to the testing of fabric enthalpy values, and there is no testing of the temperature regulation ability of the product. The temperature regulation ability of fabrics is related to the enthalpy value on the one hand, and also to the fabric indicators, such as the fabric weight, fabric structure, etc. At the same time, most people who are not engaged in phase-change related fields have no concept of enthalpy values, but the general public has a certain concept of temperature. Therefore, it has become very urgent to define the temperature regulation performance of fabrics by testing the change in temperature.

[0004] Therefore, it is urgent to develop a test method that can measure the temperature regulation performance of fabrics. It is beneficial to the product development and marketing of enterprises, and it can also establish the concept and trust of fabric temperature regulation among consumers. Summary of the invention

[0005] The purpose of the invention is to provide a method for testing the bidirectional temperature regulating performance of phase change fabrics.

[0006] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0007] A method for testing the bidirectional temperature regulation performance of phase change fabrics, comprising the following steps:

[0008] S1. Equipment and instrument preparation;

[0009] S2. Fabric enthalpy determination and fabric preparation:

[0010] S3, two-way temperature adjustment test;

[0011] S4, temperature control performance evaluation;

[0012] The step S1 comprises:

[0013] The equipment includes a phase change material high and low temperature characteristics tester and two constant temperature water tanks; the phase change material high and low temperature characteristics tester includes a test position, a first water level tank body, a second water level tank body and a temperature sensor; the first water level tank body and the second water level tank body can be moved to the test position; the temperature sensor is arranged below the test position; the two constant temperature water tanks are connected to the first water level tank body and the second water level tank body respectively through water pipes;

[0014] Equipment and instrument preparation includes: ① Ensure that the test environment is a constant temperature and humidity environment; ② Control the temperature of the liquid in the constant temperature water tank A connected to the first water level bin to be set to the first temperature, and input the liquid in the constant temperature water tank A into the first water level bin, and maintain a constant temperature cycle; Control the temperature of the liquid in the constant temperature water tank B connected to the second water level bin to be set to the second temperature, and input the liquid in the constant temperature water tank B into the second water level bin, and maintain a constant temperature cycle; ③ Turn on the phase change material high and low temperature characteristics tester, and move the first water level bin to the test bin;

[0015] The temperature of the constant temperature and humidity environment is 20±2°C, and the humidity is 65±5%; the first temperature is 32-45°C; the second temperature is -10-0°C;

[0016] The step S2 comprises:

[0017] Cut the fabric to be tested into a rectangle. If the weight of the fabric to be tested is greater than 180g / ㎡, take one layer for single-layer test. If the weight of the fabric to be tested is less than 180g / ㎡, take two layers and combine them for double-layer test. Place the cut rectangular fabric in a constant temperature and humidity test environment for at least one hour to balance it so that its initial temperature is the same as that of the test environment.

[0018] The fabric to be tested is evenly attached to the outside of the test bin along the periphery of the test bin, and the fabric is fixed by a sample clamp arranged on the test bin; the temperature sensor located under the test bin is raised to monitor the temperature of the fabric to be tested;

[0019] The step S3 comprises:

[0020] When the temperature of the fabric to be tested reaches the starting temperature, the test starts. The fabric to be tested is gradually heated up to the first conversion temperature under the action of the first water level bin. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time.

[0021] When the temperature of the fabric to be tested reaches the first conversion temperature, the telescopic mechanism starts to drive the first water level bin to move out of the test bin, and at the same time drives the second water level bin to move into the test bin. At this time, the second water level bin cools down the fabric to be tested through heat conduction, gradually decreasing from the first conversion temperature to the second conversion temperature. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time.

[0022] When the temperature of the fabric to be tested drops to the second conversion temperature, the telescopic mechanism starts to drive the second water level bin to move out of the test bin, and at the same time drives the first water level bin to move into the test bin. At this time, the first water level bin heats up the fabric to be tested through heat conduction, gradually dropping from the second conversion temperature to the first conversion temperature. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time.

[0023] Repeat the heating and cooling tests several times until at least three temperature-time curves are consistent, and then end the test;

[0024] The starting temperature is 30°C; the first conversion temperature is at most 35°C; the second conversion temperature is at most 5°C;

[0025] The step S4 comprises:

[0026] ① According to the temperature starting point and ending point of the DSC curve of the enthalpy value of the fabric to be tested, a temperature change curve with time of the fabric to be tested without phase change temperature regulation ability is drawn; ② The temperature change curves with time with at least three shapes consistent with each other obtained in step S3 are compared with the drawn temperature change curve with time, and data analysis is performed; ③ The closed interval formed between the temperature change curves with at least three shapes consistent with each other and the drawn temperature change curve with time is set as the temperature control interval, and the temperature control performance of the fabric to be tested is defined by the maximum temperature difference and duration.

[0027] On the basis of the above scheme and as a preferred scheme of the above scheme, the phase change material high and low temperature characteristics tester includes: a base frame; a bin body is arranged on the base frame; the first end of the bin body is open, and four bin split sealing plates are slidably arranged inside; the bin split sealing plates are in close contact with the inner wall of the bin body to achieve the sealing of the inner cavity of the bin body; the four bin split sealing plates are connected into one by a connecting rod, and a first water level bin body is formed between the two bin split sealing plates close to the first end of the bin body, and a second water level bin body is formed between the two bin split sealing plates away from the first end of the bin body; the first water level bin body and the second water level bin body are arranged at intervals;

[0028] A water inlet and a water outlet are provided on the compartment split sealing plate at the first end of the first water level compartment body; a water inlet and a water outlet are provided on the compartment split sealing plate at the second end of the second water level compartment body; the water inlet and the water outlet are connected to the constant temperature water tank through a water pipe;

[0029] A telescopic mechanism is provided at one side of the first end of the bin body; the movable end of the telescopic mechanism extends into the interior of the bin body and is fixedly connected to the bin split sealing plate closest to the first end of the bin body to drive the four bin split sealing plates connected as one to move along the bin body;

[0030] The middle part of the bin body is a test bin; the length of the test bin is equal to that of the first water level bin body and the second water level bin body, and a sample clamp is arranged on the test bin, and a temperature sensor is arranged below through a lifting mechanism.

[0031] On the basis of the above scheme and as a preferred scheme of the above scheme, the bin body is fixed on the base frame through a support frame; there are a plurality of support frames, which are evenly distributed on both sides of the test bin.

[0032] On the basis of the above scheme and as a preferred scheme of the above scheme, the sample clamp includes a sample clamp bracket, a lower clamp and an upper clamp; the number of the sample clamp brackets is two, which are arranged on the top of the support frame; the lower clamp is arranged on the sample clamp bracket; the upper clamp is slidably arranged on the sample clamp bracket, located above the lower clamp, and a groove adapted to the lower clamp is opened at the bottom.

[0033] On the basis of the above scheme and as a preferred scheme of the above scheme, the telescopic mechanism is a cylinder fixed on the base frame, and its piston rod extends into the warehouse body and is connected with the warehouse split sealing plate.

[0034] On the basis of the above solution and as a preferred solution of the above solution, a protective cover body is arranged outside the telescopic mechanism.

[0035] On the basis of the above solution and as a preferred solution of the above solution, the number of the temperature sensors is two.

[0036] On the basis of the above solution and as a preferred solution of the above solution, the outer cover of the test bin is provided with an isolation cover.

[0037] On the basis of the above scheme and as a preferred scheme of the above scheme, the temperature change curve with time for the fabric to be tested without phase change temperature regulation ability includes the following steps: ① Determination of the starting point and the ending point: According to the DSC enthalpy value test curve of the phase change fabric, the starting temperature and the ending temperature of the phase change time period are obtained, and the starting temperature is used as the starting point and the ending temperature is used as the ending point; ② Determination of the curve trend: Taking at least three temperature change curves with consistent shapes over time as a reference, the curve segment from the starting point to the point 3°C ​​away from the temperature control interval to the starting point is selected as the starting reference curve, and the curve segment from the end point to the point 2°C away from the temperature control interval is selected as the ending reference curve, and the temperature change curve drawn is obtained by extending the starting reference curve and the ending reference curve in opposite directions.

[0038] The beneficial effect of the present invention is that the temperature regulation ability of the fabric is measured by temperature change, which is more intuitive and easier to understand, and is convenient for consumers to distinguish the strength of the temperature regulation performance of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the phase change material high and low temperature characteristics tester of the present invention.

[0040] Figure 2 This is a schematic structural diagram of the phase change material high and low temperature characteristics tester from another perspective of the present invention.

[0041] Figure 3 The figure is a schematic diagram of the structure of the hidden protective cover and the casing of the phase change material high and low temperature characteristics tester of the present invention.

[0042] Figure 4 This is a front view of the chamber body and internal structure of the phase change material high and low temperature characteristics tester of the present invention.

[0043] Figure 5 It is a schematic diagram of the telescopic mechanism and the bin split sealing plate structure of the phase change material high and low temperature characteristics tester of the present invention.

[0044] Figure 6 It is a schematic diagram of the chamber body and internal structure of the phase change material high and low temperature characteristics tester of the present invention.

[0045] Figure 7 It is a schematic diagram of the test position and temperature sensor structure of the phase change material high and low temperature characteristics tester of the present invention.

[0046] Figure 8 It is a schematic diagram of the connection between the phase change material high and low temperature characteristics tester of the present invention and the constant temperature water tank.

[0047] Fig. 9 This is a schematic diagram of a fabric covering test position of the present invention.

[0048] Fig.10It is a schematic diagram of the structure of the tester of the present invention in combination with the isolation cover.

[0049] Fig.11 This is a temperature variation curve diagram with time with at least three consistent shapes in Example 1 of the present invention.

[0050] Fig.12 This is a DSC curve diagram of the enthalpy value test of the phase change temperature regulating fabric to be tested in Example 1 of the present invention.

[0051] In the figure: 1. base frame; 2. bin body; 3. bin split sealing plate; 4. connecting rod; 5. first water level bin body; 6. second water level bin body; 7. water inlet; 8. drain outlet; 9. telescopic mechanism; 10. test bin; 11. sample clamp; 111. sample clamp bracket; 112. lower clamp; 113. upper clamp; 12. temperature sensor; 13. support frame; 14. protective cover body; 16. isolation cover. DETAILED DESCRIPTION

[0052] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0053] A method for testing the bidirectional temperature regulation performance of phase change fabrics, comprising the following steps:

[0054] S1. Equipment and instrument preparation;

[0055] S2. Fabric enthalpy determination and fabric preparation:

[0056] S3, two-way temperature adjustment test;

[0057] S4, temperature control performance evaluation;

[0058] The step S1 comprises:

[0059] The equipment includes a phase change material high and low temperature characteristics tester and two constant temperature water tanks; the phase change material high and low temperature characteristics tester includes a test position, a first water level tank body, a second water level tank body and a temperature sensor; the first water level tank body and the second water level tank body can be moved to the test position; the temperature sensor is arranged below the test position; the two constant temperature water tanks are connected to the first water level tank body and the second water level tank body respectively through water pipes;

[0060] Equipment and instrument preparation includes: ① Ensure that the test environment is a constant temperature and humidity environment; ② Control the temperature of the liquid in the constant temperature water tank A connected to the first water level bin to be set to the first temperature, and input the liquid in the constant temperature water tank A into the first water level bin, and maintain a constant temperature cycle; Control the temperature of the liquid in the constant temperature water tank B connected to the second water level bin to be set to the second temperature, and input the liquid in the constant temperature water tank B into the second water level bin, and maintain a constant temperature cycle; ③ Turn on the phase change material high and low temperature characteristics tester, and move the first water level bin to the test bin;

[0061] The temperature of the constant temperature and humidity environment is 20±2°C, and the humidity is 65±5%; the first temperature is 32-45°C; the second temperature is -10-0°C;

[0062] The step S2 comprises:

[0063] Cut the fabric to be tested into a rectangle. If the weight of the fabric to be tested is greater than 180g / ㎡, take one layer for single-layer test. If the weight of the fabric to be tested is less than 180g / ㎡, take two layers and combine them for double-layer test. Place the cut rectangular fabric in a constant temperature and humidity test environment for at least one hour to balance it so that its initial temperature is the same as that of the test environment.

[0064] The fabric to be tested is evenly attached to the outside of the test bin along the periphery of the test bin, and the fabric is fixed by a sample clamp arranged on the test bin; the temperature sensor located under the test bin is raised to monitor the temperature of the fabric to be tested;

[0065] The step S3 comprises:

[0066] When the temperature of the fabric to be tested reaches the starting temperature, the test starts. The fabric to be tested is gradually heated up to the first conversion temperature under the action of the first water level bin. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time.

[0067] When the temperature of the fabric to be tested reaches the first conversion temperature, the telescopic mechanism starts to drive the first water level bin to move out of the test bin, and at the same time drives the second water level bin to move into the test bin. At this time, the second water level bin cools down the fabric to be tested through heat conduction, gradually decreasing from the first conversion temperature to the second conversion temperature. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time.

[0068] When the temperature of the fabric to be tested drops to the second conversion temperature, the telescopic mechanism starts to drive the second water level bin to move out of the test bin, and at the same time drives the first water level bin to move into the test bin. At this time, the first water level bin heats up the fabric to be tested through heat conduction, gradually dropping from the second conversion temperature to the first conversion temperature. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time.

[0069] Repeat the heating and cooling tests several times until at least three temperature-time curves are consistent, and then end the test;

[0070] The starting temperature is 30°C; the first conversion temperature is at most 35°C; the second conversion temperature is at most 5°C;

[0071] The step S4 comprises:

[0072] ① According to the temperature starting point and ending point of the DSC curve of the enthalpy value of the fabric to be tested, draw a temperature change curve (blank curve) of the fabric to be tested without phase change temperature regulation ability; ② Compare at least three temperature change curves with time (test curves) with the same shape obtained in step S3 with the drawn temperature change curve with time (blank curve), and perform data analysis; ③ Set the closed interval formed between at least three temperature change curves with the same shape and the drawn temperature change curve with time as the temperature control interval, and define the temperature control performance of the fabric to be tested by the maximum temperature difference and duration.

[0073] Among them, drawing the temperature change curve (blank curve) of the fabric to be tested without phase change and temperature regulation ability includes the following steps: ① Determination of the starting point and the ending point: According to the DSC enthalpy value test curve of the phase change fabric, the starting temperature and the ending temperature of the phase change time period are obtained, and the starting temperature is used as the starting point and the ending temperature is used as the ending point; ② Determination of the curve trend: Taking at least three temperature change curves with the same shape as the time as the reference, the curve segment from the starting point to the point 3°C ​​away from the temperature control interval to the starting point is selected as the starting reference curve, and the curve segment from the point 2°C away from the temperature control interval to the ending point is selected as the ending reference curve, and the starting reference curve and the ending reference curve are extended in opposite directions to obtain the temperature change curve drawn with time. The curve drawing is automatically completed by a computer, and the computer analyzes and calculates the starting reference curve and the ending reference curve to obtain the change function of the two curves, and the curve is extended with the change function of the two curves, and finally the temperature change curve (blank curve) of the fabric to be tested without phase change and temperature regulation ability is obtained.

[0074] Embodiment 1:

[0075] 1) Instrument preparation:

[0076] Turn on the air compressor in advance. Connect the thermostatic water tank B to the second bin (cold water bin), and set the temperature to -5°C (use antifreeze as the refrigerant); connect the thermostatic water tank A to the first bin (hot water bin), and set the temperature to 40°C (use water as the heat medium). Turn on the phase change material high and low temperature characteristics tester, and move the hot water bin to the test bin (to avoid the cold water bin being in the test position for a long time, causing condensation water). The maximum conversion temperature of the equipment is 35°C (that is, when the test is in progress, when the temperature of the fabric rises to 35°C, the test bin switches from the hot water bin to the cold water bin to perform a cooling test on the fabric), and the minimum conversion temperature is 5°C (that is, when the test is in progress, when the temperature of the fabric drops to 5°C, the test bin switches from the cold water bin to the hot water bin to perform a heating test on the fabric).

[0077] 2) Fabric preparation;

[0078] Size: 45cm*15cm in length and 180g / m2 in weight 2, take a single layer for testing, less than 180g / m 2 , then prepare two copies and overlap them to test the double layer. After the prepared fabric is positively balanced in a constant temperature and humidity laboratory (temperature 20℃±2℃, humidity 65%±5%) for 1 hour, the test is arranged. Positive balance makes the humidity and temperature of the fabric the same as the environment to ensure the accuracy of the test.

[0079] 3) Testing:

[0080] Wrap the prepared fabric around the test position for a week to ensure that the fabric in the test position fits the cylindrical test position smoothly. Note that during the wrapping process, wear cotton gloves on both hands to reduce the impact of body temperature on the temperature of the fabric.

[0081] After wrapping the test fabric, cover it with an isolation cover (to prevent air flow and light changes from affecting infrared temperature sensing during the test). Observe the instrument (the fabric should be in a heated state at this time), and start the test when the temperature reaches above 30°C.

[0082] The computer software connected to the instrument will record the temperature change of the fabric surface in real time and generate a temperature change curve. By analyzing the fabric curve, the temperature difference of the temperature-controlled fabric during heating and cooling can be obtained, and the temperature control performance can be evaluated based on this.

[0083] The temperature rise and fall test cycles are repeated several times until at least three of the temperature rise and fall curves have the same shape.

[0084] Among them, Figure 1 and Figure 2 As shown, the phase change material high and low temperature characteristics tester includes: a base frame 1, a bin body 2 is arranged on the top of the base frame 1, and supporting feet are arranged at the bottom.

[0085] like Figure 3 and Figure 4 As shown, the bin body 2 is preferably a cylindrical structure, which is arranged along the length direction of the base frame 1. The first end of the bin body 2 is open, the second end is closed, and four bin split sealing plates 3 are slidably arranged inside. Preferably, the bin body 2 is fixed to the base frame 1 through a support frame 13. There are several support frames 13, which are evenly distributed on both sides of the test bin 10 located in the middle of the bin body 2, and the bottom thereof is fixedly connected to the top of the base frame 1, and the top surrounds the outside of the bin body 2 of the cylindrical structure. The bin body 2 has a good heat preservation function, which can reduce the influence of heat loss on the test. At the same time, the test bin 10 in the middle of the bin body 2 is made of stainless steel to improve the heat conduction effect.

[0086] like Figure 4 and Figure 6As shown, the bin splitting sealing plate 3 is in close contact with the inner wall of the bin body 2 to achieve sealing of the inner cavity of the bin body 2 to prevent liquid leakage. Preferably, the bin splitting sealing plate 3 is a circular structure adapted to the cylindrical bin body 2, and is in close contact with the inner wall of the bin body 2 to achieve bin splitting. The close contact ensures that liquid will not leak when it enters the bin.

[0087] like Figure 5 and Figure 6 As shown, the four bin split sealing plates 3 are connected as a whole by a connecting rod 4, and the two bin split sealing plates 3 near the first end of the bin body 2 form a first water level bin body 5, and the two bin split sealing plates 3 away from the first end of the bin body 2 form a second water level bin body 6. The first water level bin body 5 and the second water level bin body 6 have the same length and are arranged at intervals.

[0088] like Figure 5 and Figure 6 As shown, the first end of the first water level bin 5 is provided with a water inlet 7 and a water outlet 8 on the bin split sealing plate 3; the second end of the second water level bin 6 is provided with a water inlet 7 and a water outlet 8 on the bin split sealing plate 3. The water inlet 7 is used for water inlet to the water level bin, and the water outlet 8 is used for water outlet to the water level bin.

[0089] For example, Figure 2 and Figure 3 As shown, in this embodiment, the water inlet 7 and the drain outlet 8 of the first water level tank body 5 are connected to the water inlet fixed on the protective cover body 14 described below through a water delivery pipe; the water inlet 7 and the drain outlet 8 of the second water level tank body 6 are connected to the water inlet fixed at the second end of the tank body 2 through a water delivery pipe. The water inlet can be connected to a constant temperature water tank through a water delivery pipe.

[0090] A telescopic mechanism 9 is provided at one side of the first end of the bin body 2, and the movable end of the telescopic mechanism 9 extends into the interior of the bin body 2 and is fixedly connected to the bin split sealing plate 3 closest to the first end of the bin body 2, so as to drive the four bin split sealing plates 3 connected together to move along the bin body 2. Preferably, as Figure 5 As shown, the telescopic mechanism 9 is a cylinder fixed on the base frame 1, and its piston rod extends into the warehouse body 2 and is connected to the warehouse split sealing plate 3. In addition, a protective cover body 14 is provided outside the telescopic mechanism 9 to play an isolation and protection role. The protective cover body 14 is fixed on the base frame 1, and one end is connected to the first end of the warehouse body 2.

[0091] like Figure 1 and Figure 2 As shown, the middle of the tank body 2 is the test tank 10, and the wall thickness of the tank body 2 can be appropriately reduced to improve the heat conduction efficiency. The length of the test tank 10 is equal to the first water level tank body 5 and the second water level tank body 6, so that the first water level tank body 5 or the second water level tank body 6 is adapted to the test tank 10 when it moves to the test tank 10.

[0092] like Figure 7As shown, a sample clamp 11 is provided on the test position 10 to clamp the phase change temperature regulating fabric covering the outside of the test position 10 .

[0093] A temperature sensor 12 is provided below the test bin 10, and the temperature sensor 12 is used to monitor in real time the change in the surface temperature of the phase change fabric outside the test bin 10. Preferably, there are two temperature sensors 12, which are symmetrically distributed in the middle of the test bin 10.

[0094] Optionally, the temperature sensor 12 is moved closer to or farther from the test position 10 through a lifting mechanism, so as to measure the temperature of the fabric wrapped outside the test position 10. The lifting mechanism is preferably a lifting cylinder, which is arranged in the base frame 1, and the top of its piston rod is connected to the temperature sensor 12 to drive the temperature sensor 12 to rise and fall; or, the temperature sensor 12 is an infrared temperature sensor, which can realize long-distance testing, and no lifting mechanism is required.

[0095] like Figure 7 As shown, the sample clamp 11 includes a sample clamp support 111, a lower clamp 112 and an upper clamp 113. There are two sample clamp supports 111, which are arranged on the top of two support frames 13 on both sides of the test position 10. The lower clamp 112 is arranged on the sample clamp support 111. The upper clamp 113 is slidably arranged on the sample clamp support 111, located above the lower clamp 112, and the distance between the upper and lower clamps can be changed. A groove matching the lower clamp 112 is provided at the bottom of the upper clamp 113 to achieve stable clamping of the phase change fabric.

[0096] Optional, such as Figure 1 and Figure 2 As shown, a protective housing is provided at the second end of the bin body 2. The protective housing is fixed on the base frame 1, and covers the second end of the bin body 2 inside for protection. At the same time, the protective housing can be used as a supporting component for the display and control buttons. After receiving the temperature signal transmitted by the temperature sensor 12, the controller displays the temperature change curve of the fabric through the display. The fabric pre-balance curve graph, the coolness test curve graph, the warmth test curve graph and the two-way temperature adjustment test curve graph of this embodiment are displayed respectively.

[0097] In addition, if Fig.10 As shown, an isolation cover 16 is provided outside the test position 10 to improve the isolation effect and reduce the influence of temperature changes caused by external light sources irradiating the tested fabric on the test.

[0098] The bottom frame 1 is hollow inside, which is convenient for laying gas pipes and water pipes.

[0099] Except for the test bin 10, the rest of the bin body 2 is a two-layer metal structure with a cavity between the two metal walls to ensure temperature stability and to ensure that the outside of the cold water bin will not be overcooled and condensed.

[0100] Working process: Figure 8 and Fig. 9 As shown, liquids of different temperatures are input into the first water level bin 5 and the second water level bin 6 through the water inlet 7; the phase change temperature regulating fabric is covered around the test bin 10 on the outside of the test bin 10, and the phase change temperature regulating fabric is fixed by the sample clamp 11; then the telescopic mechanism 9 works to drive the first water level bin 5 and the second water level bin 6 to stay at the test bin 10 respectively, so that the liquid inside the first water level bin 5 or the second water level bin 6 is heat-conducted, and the temperature of the phase change temperature regulating fabric is changed, and then the temperature of the phase change temperature regulating fabric is detected in real time by the temperature sensor 12, and the temperature regulating performance of the phase change temperature regulating fabric is judged by the law of temperature change.

[0101] Phase change performance evaluation:

[0102] Under normal circumstances, fabrics will change with the temperature of the natural environment or living environment. For example, if a fabric with a surface temperature of 0°C suddenly enters a temperature environment of 40°C, the surface temperature of the fabric will gradually rise, and the temperature rise will be fast at first and then slow. Similarly, if a fabric with a surface temperature of 40°C suddenly enters a temperature environment of 0°C, the surface temperature of the fabric will gradually drop, and the temperature drop will also be fast at first and then slow. Fig.10 shown.

[0103] For fabrics with added phase change temperature control materials, assuming that the phase change point of the fabric is at 28°C, when the temperature of the fabric changes with the natural environment or living environment, when the temperature reaches near the phase change point, the heat absorbed by the phase change material in the fabric is converted into the energy required for the solid to liquid. Therefore, near the 28°C phase change point, the temperature rise of the fabric will suddenly slow down, and the temperature rise will show a trend of slow at first and fast later. Compared with the original temperature rise change of conventional fabrics, a very obvious platform range appears. There will be a significant temperature difference between the temperature rise of the temperature control fabric near the 28°C phase change point and the temperature rise of the conventional fabric in this range. Similarly, this phenomenon will also occur when the temperature drops. Therefore, we define this interval as the temperature control interval, and use the temperature difference and duration of the temperature control interval to define the temperature control performance of the fabric.

[0104] When the temperature of the phase change temperature control fabric rises, the temperature is lower than that of the conventional fabric in the temperature control range on the left, and the maximum temperature difference is reached near the center. The stronger the temperature control ability of the fabric, the greater the maximum temperature difference and the longer the temperature range. Therefore, this application uses the maximum temperature difference value and time to define the strength of the temperature control performance of the temperature control fabric.

[0105] Similarly, when the temperature of the phase change temperature control fabric drops, the temperature in the temperature control range on the right is higher than that of the conventional fabric, and the maximum temperature difference is reached near the center. The stronger the temperature control ability of the fabric, the greater the maximum temperature difference and the longer the temperature interval. Therefore, this application uses the maximum temperature difference value and time to define the strength of the temperature control performance of the temperature control fabric.

[0106] By quickly switching between high and low temperatures, and continuously testing the temperature difference and temperature control duration of the sample at different temperatures, the temperature control ability of the sample under temperature changes can be evaluated.

[0107] After several sets of tests, at least three temperature-time curves with the same shape are obtained, such as Fig.11 As shown in curve ②, the curve includes the process of heating and cooling. The temperature-time change curve (blank curve) of the tested fabric without phase change temperature regulation ability is obtained through at least three temperature-time change curves (test curves) with the same shape. To obtain the blank curve corresponding to the phase change temperature range, several indicators must be determined first: the starting point of the blank curve (coinciding with the test curve in the past) to the end point (coinciding with the test curve in the future), and the changing trend of the curve.

[0108] The starting point and ending point of the blank curve are obtained through the DSC enthalpy value test of the phase change thermostatic fabric. Therefore, the phase change enthalpy value of the phase change thermostatic fabric to be tested must be tested first. The test method is based on the national standard GB / T43820-2024 to obtain the phase change enthalpy (melting enthalpy and crystallization enthalpy) of the fabric, as well as the phase change temperature range (extrapolated starting temperature, peak temperature, and extrapolated ending temperature). Fig.12 As shown, the extrapolated starting temperature and the extrapolated ending temperature correspond to the temperature section where the fabric undergoes phase change, and can be used as the starting point and ending point of the blank curve.

[0109] Determine the specific change trend of the blank curve, take the starting point temperature forward 3℃ away from the temperature control interval to the starting point as the starting reference curve, and the end point to the end point temperature backward 2℃ away from the temperature control interval as the end point reference curve. Through the analysis and calculation of the starting reference curve and the end point reference curve, the change functions of the two curves are obtained respectively. The curve is extended with the change functions of the two curves to finally obtain the blank curve, such as Fig.11 As shown in the middle curve ①.

[0110] Through the blank curve ( Fig.11 Curve ①) and test curve ( Fig.11 Curve ②) is compared to obtain two specific temperature control ranges, such as Fig.11 As shown in the figure, the temperature difference and duration of the temperature control interval are used to define the temperature control performance of the fabric. The larger the maximum temperature difference between the two curves in the temperature control interval, the better the phase change temperature control ability, and the longer the temperature control interval, the better the phase change temperature control ability.

[0111] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for testing the bidirectional temperature regulation performance of phase change fabrics, characterized in that: The following steps are involved: S1. Equipment and instrument preparation; S2. Fabric enthalpy determination and fabric preparation: S3, two-way temperature adjustment test; S4, temperature control performance evaluation; The step S1 comprises: The equipment includes a phase change material high and low temperature characteristics tester and two constant temperature water tanks; the phase change material high and low temperature characteristics tester includes a test position, a first water level tank body, a second water level tank body and a temperature sensor; the first water level tank body and the second water level tank body can be moved to the test position; the temperature sensor is arranged below the test position; the two constant temperature water tanks are connected to the first water level tank body and the second water level tank body respectively through water pipes; Equipment and instrument preparation includes: ① Ensure that the test environment is a constant temperature and humidity environment; ② Control the temperature of the liquid in the constant temperature water tank A connected to the first water level bin to be set to the first temperature, and input the liquid in the constant temperature water tank A into the first water level bin, and maintain a constant temperature cycle; Control the temperature of the liquid in the constant temperature water tank B connected to the second water level bin to be set to the second temperature, and input the liquid in the constant temperature water tank B into the second water level bin, and maintain a constant temperature cycle; ③ Turn on the phase change material high and low temperature characteristics tester, and move the first water level bin to the test bin; The temperature of the constant temperature and humidity environment is 20±2°C, and the humidity is 65±5%; the first temperature is 32-45°C; the second temperature is -10-0°C; The step S2 comprises: Cut the fabric to be tested into a rectangle. If the weight of the fabric to be tested is greater than 180g / ㎡, take one layer for single-layer test. If the weight of the fabric to be tested is less than 180g / ㎡, take two layers and combine them for double-layer test. Place the cut rectangular fabric in a constant temperature and humidity test environment for at least one hour to balance it so that its initial temperature is the same as that of the test environment. The fabric to be tested is evenly attached to the outside of the test bin along the periphery of the test bin, and the fabric is fixed by a sample clamp arranged on the test bin; the temperature sensor located under the test bin is raised to monitor the temperature of the fabric to be tested; The step S3 comprises: When the temperature of the fabric to be tested reaches the starting temperature, the test starts. The fabric to be tested is gradually heated up to the first conversion temperature under the action of the first water level bin. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time. When the temperature of the fabric to be tested reaches the first conversion temperature, the telescopic mechanism starts to drive the first water level bin to move out of the test bin, and at the same time drives the second water level bin to move into the test bin. At this time, the second water level bin cools down the fabric to be tested through heat conduction, gradually decreasing from the first conversion temperature to the second conversion temperature. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time. When the temperature of the fabric to be tested drops to the second conversion temperature, the telescopic mechanism starts to drive the second water level bin to move out of the test bin, and at the same time drives the first water level bin to move into the test bin. At this time, the first water level bin heats up the fabric to be tested through heat conduction, gradually dropping from the second conversion temperature to the first conversion temperature. The temperature sensor monitors the fabric temperature in real time and transmits it to the controller, which generates a temperature change curve over time. Repeat the heating and cooling tests several times until at least three temperature-time curves are consistent, and then end the test; The starting temperature is 30°C; the first conversion temperature is at most 35°C; the second conversion temperature is at most 5°C; The step S4 comprises: ① According to the temperature starting point and ending point of the DSC curve of the enthalpy value of the fabric to be tested, a temperature change curve with time of the fabric to be tested without phase change temperature regulation ability is drawn; ② The temperature change curves with time with at least three shapes consistent with each other obtained in step S3 are compared with the drawn temperature change curve with time, and data analysis is performed; ③ The closed interval formed between the temperature change curves with at least three shapes consistent with each other and the drawn temperature change curve with time is set as the temperature control interval, and the temperature control performance of the fabric to be tested is defined by the maximum temperature difference and duration.

2. A method for testing the bidirectional temperature regulation performance of phase change fabrics according to claim 1, characterized in that: The phase change material high and low temperature characteristics tester comprises: a base frame (1); a bin body (2) is arranged on the base frame (1); the first end of the bin body (2) is open, and four bin split sealing plates (3) are slidably arranged inside; the bin split sealing plates (3) are in close contact with the inner wall of the bin body (2) to achieve sealing of the inner cavity of the bin body (2); the four bin split sealing plates (3) are connected into one by a connecting rod (4), and a first water level bin body (5) is formed between two bin split sealing plates (3) close to the first end of the bin body (2), and a second water level bin body (6) is formed between two bin split sealing plates (3) away from the first end of the bin body (2); the first water level bin body (5) and the second water level bin body (6) are arranged at intervals; The first end of the first water level bin body (5) is provided with a water inlet (7) and a water outlet (8) on the bin split sealing plate (3); the second end of the second water level bin body (6) is provided with a water inlet (7) and a water outlet (8); the water inlet (7) and the water outlet (8) are connected to the constant temperature water tank via a water pipe; A telescopic mechanism (9) is provided on one side of the first end of the bin body (2); the movable end of the telescopic mechanism (9) extends into the interior of the bin body (2) and is fixedly connected to the bin split sealing plate (3) closest to the first end of the bin body (2) so as to drive the four bin split sealing plates (3) connected as one to move along the bin body (2); The middle part of the chamber (2) is a test chamber (10); the length of the test chamber (10) is equal to that of the first water level chamber (5) and the second water level chamber (6), and a sample clamp (11) is arranged on the test chamber (10), and a temperature sensor (12) is arranged below.

3. A method for testing the bidirectional temperature regulation performance of phase change fabrics according to claim 2, characterized in that: The bin body (2) is fixed on the base frame (1) via a support frame (13); there are a plurality of support frames (13) which are evenly distributed on both sides of the test bin (2).

4. A method for testing the bidirectional temperature regulation performance of phase change fabrics according to claim 2, characterized in that: The sample clamp (11) comprises a sample clamp support (111), a lower clamp (112) and an upper clamp (113); the sample clamp support (111) is two in number and is arranged on the top of the support frame (13); the lower clamp (112) is arranged on the sample clamp support (111); the upper clamp (113) is slidably arranged on the sample clamp support (111), is located above the lower clamp (112), and has a groove at the bottom thereof adapted to the lower clamp (112).

5. A method for testing the bidirectional temperature regulation performance of phase change fabrics according to claim 2, characterized in that: The telescopic mechanism (9) is a cylinder fixed on the base frame (1), and its piston rod extends into the warehouse body (2) and is connected to the warehouse split sealing plate (3).

6. A method for testing the bidirectional temperature regulation performance of phase change fabrics according to claim 5, characterized in that: A protective cover body (14) is arranged outside the telescopic mechanism (9).

7. A method for testing the bidirectional temperature regulation performance of phase change fabrics according to claim 2, characterized in that: The number of the temperature sensors (12) is two.

8. A method for testing the bidirectional temperature regulation performance of phase change fabrics according to claim 2, characterized in that: The outer cover of the test bin (10) is provided with an isolation cover (16).

9. A method for testing the bidirectional temperature regulation performance of phase change fabrics according to claim 1, characterized in that: The method for drawing a temperature variation curve of the tested fabric without phase change temperature regulation ability over time includes the following steps: ① determining the starting point and the ending point: obtaining the starting temperature and the ending temperature of the phase change time period according to the DSC enthalpy value test curve of the phase change fabric, with the starting temperature as the starting point and the ending temperature as the ending point; ② determining the curve trend: taking at least three temperature variation curves with the same shape over time as a reference, selecting the curve segment from the starting point to the point 3°C ​​away from the temperature control interval to the starting point as the starting reference curve, selecting the curve segment from the end point to the point 2°C away from the temperature control interval as the ending reference curve, and extending the starting reference curve and the ending reference curve in opposite directions to obtain the drawn temperature variation curve over time.

Images