Nanofiber thermal insulation cotton and testing device thereof

Abstract

The present application relates to the technical field of new thermal insulation material testing, in particular to a kind of nanofiber thermal insulation cotton and its testing device, thermal insulation cotton includes the following components: polypropylene, polyethylene terephthalate, EVA hot melt adhesive and decalin;Thermal insulation cotton testing device includes rack and transposition disc installed on the top of rack, the top middle part of rack is fixedly arranged with U-shaped support, detection drive assembly is arranged on both sides of U-shaped support, the position of two detection drive assemblies on the top of transposition disc is respectively provided with heat conductivity test component and pressure test component, linkage is carried out between two detection drive assemblies, heat conductivity test component and pressure test component are respectively with the detection drive assembly of corresponding position constitute heat conductivity detection mechanism and pressure detection mechanism;The present application can carry out pressure test and heat conductivity test simultaneously, and the prepared thermal insulation cotton has the characteristics of low density, special structure and high resilience.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of testing new thermal insulation materials, in particular to a nanofiber thermal insulation cotton and a testing device thereof. BACKGROUND

[0002] So far, PP, PET, polyurethane and other porous fibers and foaming materials are the most representative and widely used non-high-temperature-resistant thermal insulation materials. The principle of thermal insulation materials is the density of the material and how much air layer can be preserved. Since air is the best medium for thermal insulation in nature (thermal conductivity coefficient is about 0.0267 W / m-K), the material needs to have very low density, special internal structure and can maintain its fixed shape to maintain the density, which is the key to high-performance thermal insulation materials. Generally speaking, materials with very low density are very difficult to have elasticity and softness while maintaining shape because there is very little internal material, and very special structure is needed to achieve this.

[0003] Most of the existing chemical fiber thermal clothing is filled with relatively thick fibers, which can maintain elasticity and shape, but the density is large and the internal structure does not conform to the scientific thermal structure. In addition, although the down in the down jacket has very good thermal performance, it has the disadvantage of not being washable, which greatly limits its range of use for outdoor and military purposes.

[0004] The prior art discloses a thermal insulation cotton and a preparation method thereof. The thermal insulation cotton is composed of 90.2-94.5% of regenerated polylactic acid fibers and 5.5-9.8% of a binder. The preparation method of the thermal insulation cotton comprises the following steps: melting and regenerating polylactic acid corner waste to obtain regenerated polylactic acid granules; feeding the regenerated polylactic acid granules into a melt spinning machine after drying to perform spinning, and obtaining regenerated polylactic acid fibers through heat setting, crimping and cutting, wherein the heat setting is divided into three zones, and the heat setting time of the three zones is 8-12 min in total; and pretreating the regenerated polylactic acid fibers through the processes of opening, mixing, carding, cross-laying, reinforcing, solidifying, setting, slitting and winding to prepare the thermal insulation cotton.

[0005] The prior art discloses a Chinese patent with publication number CN 209624239 U (IPC classification number G01N3 / 08) discloses a kind of thermal insulation cotton compression testing machine, and discloses bed, controller, support seat, lower pressing seat and drive mechanism;The bed has a workbench and is set on the column of workbench, the lower end front side of column forms has accommodating space, a plurality of guide posts are arranged on the workbench, and the plurality of guide posts are located in accommodating space;The support seat is set on the workbench and is located in accommodating space, the top surface of support seat has a placement thermal insulation cotton installation site, and the bottom of support seat is provided with pressure sensor, the pressure sensor is connected with controller, displacement sensor is arranged on the side of installation site, the displacement sensor is connected with controller, and displacement sensor protrudes the surface of installation site.

[0006] However, the prior art still has certain defects, such as high density of thermal insulation cotton, without high resilience characteristics, and the internal thermal insulation structure is easily damaged by external environment;

[0007] For example, the testing machine can only test the pressure, and when the thermal conductivity needs to be tested, another testing equipment needs to be used for detection, the production testing procedure is complex, the actual production process is troublesome to operate, inconvenient to use, and the production detection cost is high. SUMMARY

[0008] The present application aims to provide a kind of nanofiber thermal insulation cotton and its testing device to solve the problems raised in the above background art.

[0009] The object of the present application can be achieved by the following technical solutions:

[0010] A kind of nanofiber thermal insulation cotton, the thermal insulation cotton includes the following components: polypropylene, polyethylene terephthalate, EVA hot melt adhesive and decalin;

[0011] EVA hot melt adhesive is added to polypropylene to prepare first spinning solution, the viscosity of the prepared first spinning solution is adjusted to less than 50Pa·s in the range of 1000-100001 / s shear rate, and first polymer fiber is obtained by melt blowing equipment on the first spinning solution;

[0012] Dekalin is added to polyethylene terephthalate to prepare second spinning solution, the viscosity of the prepared second spinning solution is adjusted to less than 150mPa·s in the range of 1000-100001 / s shear rate, and second polymer fiber is obtained by flash evaporation equipment on the second spinning solution;

[0013] Under the traction of a fan, the first polymer fiber and the second polymer fiber are mixed uniformly by a plurality of air nozzles, and are sprayed out through a spinneret to obtain fibers with a normal fiber diameter distribution and an average fiber diameter of 0.8-1 mu m, and then the prepared fibers are subjected to opening, vibration feeding, carding, web laying, glue spraying, drying and calendering operations to obtain the nanofiber thermal insulation cotton.

[0014] The application further provides a testing device for the nanofiber thermal insulation cotton, which is used for testing the nanofiber thermal insulation cotton and comprises a rack, a U-shaped support fixedly arranged at the top middle portion of the rack, and a circular groove formed in the top end surface of the rack, wherein a transposition disc is movably arranged in the circular groove, a driving motor one is fixedly installed at the bottom of the rack, the output shaft end of the driving motor one movably penetrates through the rack, and the output shaft end of the driving motor one is fixedly connected with the transposition disc, and two groups of film temperature sensors are fixedly embedded in the top portion of the transposition disc.

[0015] The two sides of the U-shaped support are provided with detection driving assemblies, and the two detection driving assemblies are centrally symmetrically arranged about the axis of the transposition disc, the top portion of the transposition disc is provided with a thermal conductivity testing assembly and a pressure testing assembly at positions corresponding to the two detection driving assemblies, the two detection driving assemblies are linked, and the thermal conductivity testing assembly and the pressure testing assembly respectively form a thermal conductivity detection mechanism and a pressure detection mechanism with the detection driving assemblies at the corresponding positions, and wireless signal transmitters are installed on the thermal conductivity testing assembly and the pressure testing assembly.

[0016] In a preferred embodiment, the detection driving assembly comprises a horizontal plate fixed to the side surface of the U-shaped support and two vertical plates fixed to the top end surface of the inner side of the U-shaped support, a vertical shaft is movably arranged at the end of the horizontal plate away from the U-shaped support, two limiting flaps are fixedly arranged on the outer circumferential surface of the top end of the vertical shaft and are respectively fitted with the upper surface and the lower surface of the horizontal plate, and a linkage part is arranged between the vertical shafts of the two detection driving assemblies.

[0017] In a preferred embodiment, the linkage part comprises a driving motor two fixedly installed at the top central position of the U-shaped support, the output shaft end of the driving motor two movably penetrates through the U-shaped support, and the output shaft end of the driving motor two is fixedly connected with a driving wheel, a driven wheel is fixedly arranged on the outer circumferential surface of each of the vertical shafts at a position corresponding to the driving wheel, and the two driven wheels are connected with the driving wheel through a belt transmission.

[0018] In a preferred embodiment, the bottom end of the vertical shaft is fixedly connected with a rotating disc, an arc-shaped convex plate is fixedly arranged at the edge position of the bottom end surface of the rotating disc, and a film pressure sensor one is installed at the bottom middle portion of the arc-shaped convex plate and the end of the bottom end surface of the rotating disc away from the arc-shaped convex plate.

[0019] In a preferred embodiment, a deflection part is arranged between the vertical plates on the detection driving assembly and the rack, the deflection part comprises a side plate fixed on the top of the rack and a deflection rod rotatably installed between the two vertical plates in a through type by bearings, and the outer circumferential surface of the deflection rod is fixedly sleeved with a deflection block at the position between the two vertical plates.

[0020] The middle part of the two sides of the deflection block is fixedly connected with a swing rod and a ball seat rod respectively, the end of the ball seat rod is fixedly connected with a ball, the outer circumferential surface of one end of the deflection rod close to the side plate is fixedly provided with a U-shaped rod, the middle part of the U-shaped rod is movably sleeved with a sleeve ring, and the sleeve ring is fixedly connected with the side plate through a spring one.

[0021] In a preferred embodiment, the heat conduction test assembly comprises an isolation cover fixedly connected to the end of the swing rod on the detection driving assembly, a gas cylinder is fixedly installed at the center position of the inner cavity of the isolation cover, and an electric heating plate is fixedly connected to the end of the telescopic end of the gas cylinder.

[0022] In a preferred embodiment, the pressure test assembly comprises a top plate fixedly connected to the end of the swing rod on the detection driving assembly, a limiting frame is fixedly sleeved on the side of the top plate, a pressing plate is arranged in the cavity between the top plate and the limiting frame, an angle plate is fixedly arranged at the top of each corner of the limiting frame, and a guide column is fixedly arranged at the top of each corner of the pressing plate.

[0023] The top end of the guide column is movably penetrated through the top plate and the angle plate at the corresponding position in sequence, a circular plate is fixedly arranged on the top end surface of the guide column, a spring two is fixedly connected to the position between the angle plate and the circular plate on the side surface of the guide column, a pressing part is arranged between the top plate and the pressing plate, and a thin film pressure sensor two is installed on the bottom of the pressing plate.

[0024] In a preferred embodiment, the pressing part comprises a mandrel rotatably installed on the limiting frame in a horizontal type by bearings, two groups of cams are fixedly sleeved on the circumferential surface of the mandrel, the cams are arranged in an axial symmetry with respect to the vertical axial section of the pressing plate, there are three cams in each group, and the three cams in each group are sequentially arranged in a decreasing manner along the axial direction of the mandrel, a driving motor three is fixedly installed on one side of the limiting frame, and the output shaft end of the driving motor three is fixedly connected with one end of the mandrel.

[0025] In a preferred embodiment, a cooling mechanism is arranged between the heat conduction test assembly and the pressure test assembly, the cooling mechanism comprises an L-shaped support fixed on the top of the rack, a hollow fan ring plate is fixedly connected to the inner top end surface of the L-shaped support, a plurality of air outlet grooves are formed in the bottom end surface of the fan ring plate, and a gas pump and a pressing switch are installed on the top of the L-shaped support.

[0026] The beneficial effects of the present application are as follows:

[0027] 1. The application drives the sample to be detected on the transposition disc to move between the heat conductivity test assembly and the pressure test assembly by using the driving motor, and cooperates with the intermittent driving of the heat conductivity test assembly and the pressure test assembly by the detection driving assembly to complete the pressure test of the sample and the heat conductivity test before and after the sample is pressed, so as to judge the quality of the target thermal insulation cotton.

[0028] 2. The cooling mechanism is arranged between the heat conductivity test assembly and the pressure test assembly, the horizontal surface area of the arc-shaped convex plate at the position where the ball on the pressure detection mechanism enters can be used to press the pressing switch on the L-shaped support, so that the air pump is started to inject air into the inner cavity of the fan ring plate, and then the air is blown out from the air outlet groove on the bottom end surface of the fan ring plate, so that the sample after the heat conductivity test is air-cooled during the transposition process, and the influence of the sample with residual temperature on the test result is avoided.

[0029] 3. The average diameter of the fiber in the production process and the proportion of the thick and thin fibers in the aggregate are controlled, and a series of fiber shaping methods are used to make the prepared nanofiber thermal insulation cotton have the characteristics of low density, special structure and high resilience. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor;

[0031] Figure 1 is the first perspective view of the overall structure of the test device of the application;

[0032] Figure 2 is the second perspective view of the overall structure of the test device of the application;

[0033] Figure 3 is the first perspective view of the detection driving assembly of the test device of the application;

[0034] Figure 4 is the second perspective view of the detection driving assembly of the test device of the application;

[0035] Figure 5 is the structure schematic view of the heat conductivity detection mechanism of the test device of the application;

[0036] Figure 6 is the top view of the heat conductivity detection mechanism of the test device of the application;

[0037] Figure 7 is theFigure 6 Fig. 2 is a schematic view of the cross-sectional structure along A-A direction in Fig. 1;

[0038] Figure 8 Fig. 3 is a schematic view of the pressure detection mechanism of the testing device of the present application;

[0039] Figure 9 Fig. 4 is a top view of the pressure detection mechanism of the testing device of the present application;

[0040] Figure 10 Fig. 5 is a schematic view of the pressure testing assembly of the testing device of the present application; Figure 9 Fig. 6 is a schematic view of the cross-sectional structure along B-B direction in Fig. 5;

[0041] Figure 11 Fig. 7 is a top view of the pressure testing assembly of the testing device of the present application;

[0042] Figure 12 Fig. 8 is a schematic view of the cooling mechanism of the testing device of the present application; Figure 11 Fig. 9 is a schematic view of the cross-sectional structure along C-C direction in Fig. 8;

[0043] Figure 13 Fig. 10 is a schematic view of the cooling mechanism of the testing device of the present application from the first perspective;

[0044] Figure 14 Fig. 11 is a schematic view of the cooling mechanism of the testing device of the present application from the second perspective;

[0045] Figure 15 Fig. 12 is a schematic view of the rack and the transposition disc of the testing device of the present application;

[0046] Figure 16 Fig. 13 is a flow chart of the production and arrangement process of the nanofiber thermal insulation cotton of the present application;

[0047] Figure 17 Fig. 14 is a schematic view of the preparation of the nanofiber by the flash evaporation method of the present application;

[0048] Figure 18 Fig. 15 is a SEM microscope photo of the fiber prepared by the optimal embodiment of the present application;

[0049] Figure 19 Fig. 16 is a degree distribution graph of the fiber prepared by the optimal embodiment of the present application;

[0050] Figure 20 Fig. 17 is a thermal conductivity graph of the fiber assembly of the fiber prepared by the optimal embodiment of the present application;

[0051] Figure 21 Fig. 18 is a thermal resistance graph of the fiber assembly of the fiber prepared by the optimal embodiment of the present application.

[0052] The figure marks are as follows: 1, rack; 2, U-shaped support; 3, round groove; 4, transposition disc; 5, thin film temperature sensor; 6, detection driving assembly; 61, horizontal plate; 62, vertical plate; 63, vertical shaft; 64, limiting baffle disc; 65, rotating disc; 66, arc-shaped convex plate; 67, driving wheel; 68, driven wheel; 69, deflection lever; 610, deflection block; 611, swing lever; 612, ball; 613, U-shaped lever; 614, collar; 615, side plate; 616, spring I; 617, thin film pressure sensor I; 7, thermal conductivity testing assembly; 71, electric heating plate; 72, air cylinder; 73, isolation cover; 8, pressure testing assembly; 81, top plate; 82, limiting frame; 83, pressing plate; 84, guide column; 85, angle plate; 86, round plate; 87, spring II; 88, mandrel; 89, cam; 810, thin film pressure sensor II; 9, cooling mechanism; 91, L-shaped support; 92, fan ring plate; 93, air outlet groove; 94, air pump; 95, press switch; 10, wireless signal transmitter; 11, melt-blowing equipment; 111, flash evaporation equipment; 112, air nozzle; 113, scrim; 114, air fan. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0054] A testing device for nanofiber thermal insulation cotton is characterized by testing the performance of energy-saving thermal insulation new materials under stable pressure, and the IPC classification number is G01N3 / 08.

[0055] Embodiment 1

[0056] Referring to the drawings attached Figures 1-2 and Figure 15 The testing device for nanofiber thermal insulation cotton of an embodiment of the present application is used for testing the above-mentioned nanofiber thermal insulation cotton, comprising a rack 1, a U-shaped support 2 is fixedly arranged on the top middle part of the rack 1, and a round groove 3 is formed on the top end surface of the rack 1, a transposition disc 4 is movably sleeved in the round groove 3, a driving motor I is fixedly installed at the bottom of the rack 1, the output shaft end of the driving motor I movably penetrates the rack 1, and the output shaft end of the driving motor I is fixedly connected with the transposition disc 4, two groups of thin film temperature sensors 5 are fixedly embedded on the top of the transposition disc 4;

[0057] The U-shaped support 2 is provided with a detection driving assembly 6 on both sides, and the two detection driving assemblies 6 are centrally symmetrically arranged about the axis of the transposition disc 4. The top of the transposition disc 4 is provided with a thermal conductivity test assembly 7 and a pressure test assembly 8 at positions corresponding to the two detection driving assemblies 6, respectively. The two detection driving assemblies 6 are linked. The thermal conductivity test assembly 7 and the pressure test assembly 8 form a thermal conductivity detection mechanism and a pressure detection mechanism with the corresponding detection driving assembly 6, respectively. The thermal conductivity test assembly 7 and the pressure test assembly 8 are both provided with a wireless signal transmitter 10.

[0058] It should be noted that the present application drives the sample to be detected on the transposition disc 4 between the thermal conductivity test assembly 7 and the pressure test assembly 8 by using the driving motor, and synchronously drives the thermal conductivity test assembly 7 and the pressure test assembly 8 to press down intermittently by cooperating with the detection driving assembly 6, so as to complete the pressure test of the sample and the thermal conductivity test before and after the sample is pressed, thereby determining the use performance of the target thermal insulation cotton.

[0059] Specifically, as shown in Figures 1-4 The detection driving assembly 6 includes a horizontal plate 61 fixed on the side surface of the U-shaped support 2 and two vertical plates 62 fixed on the top end surface of the inner side of the U-shaped support 2. A vertical shaft 63 is movably penetrated through one end of the horizontal plate 61 away from the U-shaped support 2. Two limiting flaps 64 are fixedly sleeved on the outer circumferential surface of the top end of the vertical shaft 63 and are respectively fitted with the upper surface and the lower surface of the horizontal plate 61. A linkage part is arranged between the vertical shafts 63 of the two detection driving assemblies 6.

[0060] The linkage part includes a driving motor two fixedly installed at the central position of the top of the U-shaped support 2. The output shaft end of the driving motor two is movably penetrated through the U-shaped support 2, and the output shaft end of the driving motor two is fixedly connected with a driving wheel 67. The outer circumferential surface of the vertical shaft 63 is fixedly sleeved with a driven wheel 68 at a position corresponding to the driving wheel 67. The two driven wheels 68 and the driving wheel 67 are connected through a belt transmission.

[0061] The bottom end of the vertical shaft 63 is fixedly connected with a rotating disc 65. An arc-shaped convex plate 66 is fixedly arranged at the edge position of the bottom surface of the rotating disc 65. A thin film pressure sensor one 617 is installed at the bottom middle part of the arc-shaped convex plate 66 and the end of the bottom surface of the rotating disc 65 away from the arc-shaped convex plate 66.

[0062] A deflection part is arranged between the vertical plate 62 of the detection driving assembly 6 and the rack 1. The deflection part includes a side plate 615 fixedly arranged at the top of the rack 1 and a deflection rod 69 movably penetrated and rotatably installed between the two vertical plates 62 through bearings. The outer circumferential surface of the deflection rod 69 is fixedly sleeved with a deflection block 610 at a position between the two vertical plates 62.

[0063] A swing rod 611 and a ball seat rod are fixedly connected to the middle of both sides of the deflection block 610, respectively. A ball 612 is fixedly connected to the end of the ball seat rod. A U-shaped rod 613 is fixedly provided on the outer circumference of one end of the deflection rod 69 near the side plate 615. A collar 614 is movably sleeved in the middle of the U-shaped rod 613. A spring 616 is fixedly connected between the collar 614 and the side plate 615.

[0064] It should be noted that, in order to ensure smooth switching between the sphere 612 and the arc-shaped convex plate 66, the arc-shaped convex plate 66 should be designed as an isosceles trapezoid, and, when the U-shaped rod 613 is in Figure 3 In the indicated state, spring 616 is in a stretched state, while the thermal conductivity testing component 7 and the pressure testing component 8 are installed at the end of the swing arm 611 away from the deflection block 610. When the intermittently driven thermal conductivity testing component 7 and pressure testing component 8 are synchronously pressed down on the sample by the detection drive component 6, the drive motor 2 drives the active wheel 67 to rotate, thereby causing the two vertical shafts 63 to rotate synchronously with the driven wheel 68, which in turn causes the turntable 65 to rotate. The rotation process of the turntable 65 can be composed of the following two parts:

[0065] In process one, when the turntable 65 rotates to the point where its bottom edge is far from the arc-shaped convex plate 66 and contacts the sphere 612, the deflecting block 610 deflects under the tensile restoring force of the spring 616 to the position shown in the diagram. Figure 3 In the state shown, the thermal conductivity testing component 7 and the pressure testing component 8 at the ends of the two pendulum rods 611 are respectively attached to the sample at the corresponding position. The sphere 612 in this state will press against the thin film pressure sensor 617 in the area where the bottom surface of the turntable 65 is located. The thin film pressure sensor 617 that detects the pressure signal will transmit the signal to the control terminal. The control terminal will issue a command to control the thermal conductivity testing component 7 and the pressure testing component 8 to simultaneously perform thermal conductivity detection and pressure detection on the sample at the current position. This testing state will continue until the sphere 612 completely detaches from the pressing contact state with the thin film pressure sensor 617 in the current area.

[0066] Process two, when the ball 612 off the area of the rotating disc 65 into contact with the arc-shaped convex plate 66 state, the ball 612 will be through the arc-shaped convex plate 66 on the slope area into the horizontal plane area, in this process, with the rotation of the rotating disc 65, will gradually down the ball 612, to drive the deflection block 610 with the deflection rod 69 as the center axis to the side plate 615 of the location of the direction of movement away from, thus driving the U-shaped rod 613 of the location of the deflection rod 69 end synchronous deflection, and stretch spring 616, while the thermal conductivity test assembly 7 and the pressure test assembly 8 will gradually away from the clamping state of the sample with the location of the swing rod 611 upward deflection, when the ball 612 completely into the arc-shaped convex plate 66 on the horizontal plane area, thermal conductivity test assembly 7 and the pressure test assembly 8 completely away from the clamping state of the sample in the location;

[0067] And when the rotating disc 65 rotates to the ball 612 and the film pressure sensor 617 on the arc-shaped convex plate 66 pressure contact, the film pressure sensor 617 detecting the pressure signal will be transmitted to the control end, the control end will issue an instruction to start the drive motor to drive the displacement disc 4 to rotate 180°, realize the sample of thermal conductivity test station and pressure test station to change position, and then with the ball 612 off the arc-shaped convex plate 66 area repeat the above process.

[0068] Further, in the above process, the horizontal plane area on both ends of the arc-shaped convex plate 66 is empty (i.e. the location of the film pressure sensor 617 is not covered by the area), if the same sample in the thermal conductivity test station and the pressure test station are completed two rounds of test, will be replaced by a new sample after completing the second round of pressure detection, before the station switching, in this way, the sample can be tested for pressure and the thermal conductivity of the sample before and after the pressure test, so as to judge the quality of the target insulation cotton.

[0069] Specifically, as shown in Figure 2 and Figures 5-7 The thermal conductivity test assembly 7 includes a swing rod 611 end fixedly connected to the corresponding position detection driving assembly 6 on the isolation cover 73, the isolation cover 73 inner cavity top center position fixedly installed with a gas cylinder 72, the telescopic end of the gas cylinder 72 is fixedly connected with an electric heating plate 71.

[0070] It should be noted that, in the process of testing the heat conductivity of the sample, when the position turntable 65 rotates to the contact of the spherical ball 612 with the film pressure sensor one 617 in the area of the bottom end face, the film pressure sensor one 617 detecting the pressure signal will transmit the signal to the control end, and the control end will issue an instruction to control the air cylinder 72 to push the electric heating plate 71 to contact the upper surface of the sample, heat the upper surface of the test sample, at the same time, start the film temperature sensor 5 in the position to detect the temperature of the lower surface of the test sample, so as to judge the heat conductivity of the sample, and in the process of heat conductivity detection, the sample is also covered by the isolation cover 73 to avoid affecting the test results in the open environment.

[0071] Specifically, as shown in Figure 1 and Figures 8-12 The pressure test assembly 8 comprises a top plate 81 fixedly connected to the end of the swing rod 611 of the corresponding position detection driving assembly 6, a limiting frame 82 fixedly sleeved on the side surface of the top plate 81, and a pressing plate 83 arranged in the cavity between the top plate 81 and the limiting frame 82, and an angle plate 85 is fixedly arranged at the top four corner positions of the limiting frame 82, and a guide column 84 is fixedly arranged at the top four corner positions of the pressing plate 83.

[0072] The top end of the guide column 84 successively penetrates the top plate 81 and the corresponding angle plate 85, a circular plate 86 is fixedly arranged on the top end surface of the guide column 84, a spring two 87 is fixedly connected to the position between the angle plate 85 and the circular plate 86 on the side surface of the guide column 84, a pressing part is arranged between the top plate 81 and the pressing plate 83, and a film pressure sensor two 810 is mounted on the bottom of the pressing plate 83.

[0073] The pressing part comprises a mandrel 88 horizontally rotatably mounted on the limiting frame 82 through a bearing, two groups of cams 89 are fixedly sleeved on the circumferential surface of the mandrel 88, the cams 89 are arranged in axial symmetry about the pressing plate 83, there are three in each group, and the three cams 89 in each group are successively arranged in the axial direction of the mandrel 88, a driving motor three is fixedly installed on one side of the limiting frame 82, and the output shaft end of the driving motor three is fixedly connected with one end of the mandrel 88.

[0074] Need to explain, in the process of pressure test on the sample, when the position turntable 65 rotates to the ball 612 with its bottom end face area of film pressure sensor one 617 pressure contact, the film pressure sensor one 617 that detects the pressure signal will transmit the signal to the control end, and the control end sends instructions, control drive motor three drive shaft 88 rotation, thereby driving the cam 89 intermittently pressed down the platen 83, let the platen 83 drive the guide column 84 synchronous downward movement, and compress the spring two 87 of corresponding position, realize the vibration type pressure detection on the sample, and, in the process of pressure detection, also use the limiting frame 82 to cover the sample, avoid the uneven stress on the sample when testing in the open environment and affect the test results.

[0075] Embodiment 2

[0076] Refer to the description attached Figures 1-2 And Figures 13-14 , an embodiment of the application, a kind of nanofiber thermal insulation cotton testing device, the thermal conductivity test component and pressure test component 8 between setting cooling mechanism 9, cooling mechanism 9 includes fixed in the top of rack 1 L-shaped support 91, L-shaped support 91 inner side top end surface is fixedly connected with the hollow fan ring plate 92, fan ring plate 92 bottom end surface is provided with a plurality of air outlet grooves 93, L-shaped support 91 top is equipped with air pump 94 and press switch 95.

[0077] Need to explain, press switch 95 and the ball 612 on the pressure detection mechanism are opposite, and when the ball 612 on the pressure detection mechanism begins to enter the horizontal plane area on the arc-shaped convex plate 66 of the position, the ball 612 presses the press switch 95 on the L-shaped support 91, so as to start the air pump 94 to inject air into the inner cavity of the fan ring plate 92, and then blow out through the air outlet grooves 93 on the bottom end surface of the fan ring plate 92, to cool the sample during the indexing process after completing the thermal conductivity test, to avoid the sample with residual heat directly entering the pressure test station for testing and affecting the result, on the contrary, when the ball 612 on the pressure detection mechanism is separated from the horizontal plane area on the arc-shaped convex plate 66 of the position, the ball 612 is separated from the press switch 95, at this time, the air pump 94 stops gas transmission, and the next round of press switch 95 is pressed by the ball 612 in the position, the cooling mechanism 9 is started again to cool the sample during the indexing process.

[0078] In the above technical solution, in order to better control the drive motor, a unified kinematics and electrical model is established for the drive motor one, the drive motor two and the drive motor three, and the expression is as follows:

[0079]

[0080] In the formula, M represents the mass of the mover of the driving motor, F represents the thrust of the driving motor, v represents the moving speed of the mover, B represents the viscous damping coefficient, i q represents the q-axis current, F f represents the thrust constant of the driving motor, R a represents the primary winding resistance of the driving motor, L q represents the primary inductance of the driving motor, tau represents the pole pitch, and Phi f represents the magnetic flux.

[0081] The PID controller is used to control the driving motor, a control deviation e(t) is formed according to a motor input value r(t) and an actual output value y(t), the control deviation e(t) is operated in proportion, integration and differentiation and is linearly superposed to form a control value u(t) output, and in a continuous time domain, the control model of the PID is as follows:

[0082]

[0083] In the formula, k p represents a proportional coefficient, T i represents an integral time constant, and T d represents a differential time constant.

[0084] In order to overcome the time lag caused by the filter and the inverter in the controller of the driving motor in the driving process of the driving motor, the current loop is equivalent to an inertia link, and the transfer function is as follows:

[0085]

[0086] In the formula, T rg represents the thrust coefficient of the driving motor, T fil represents the filter time constant, and T i represents the inverter time constant.

[0087] It should be noted that the present application can accurately control the operation rhythm of the driving motor by establishing the kinematic and electrical models of the driving motor, and simultaneously effectively controls the driving motor by using the PID controller, so as to ensure the effectiveness of the driving motor in the operation process.

[0088] In the above technical solution, the circuit, electronic components and control module involved are all prior art, and a person skilled in the art can realize them without further description, and the content to be protected by the present application does not involve improvement of software and methods.

[0089] A kind of nanofiber heat preservation and thermal insulation cotton, the heat preservation and thermal insulation cotton includes the following components: polypropylene, polyethylene terephthalate, EVA hot melt adhesive and decalin.

[0090] As Figures 16-17As shown, the system for preparing the nanofiber thermal insulation cotton comprises a melt-blowing device 11, a flash device 111, a plurality of air nozzles 112, a screen cloth 113, and a fan 114, wherein the melt-blowing device 11 is used for melt-blowing treatment of a first spinning solution to obtain first polymer fibers; the flash device 111 is used for flash treatment of a second spinning solution to obtain second polymer fibers; the plurality of air nozzles 112 are used for mixing the first polymer fibers and the second polymer fibers; at least one air nozzle 112 is arranged at an outlet of the melt-blowing device 11; at least one air nozzle 112 is arranged at an outlet of the flash device 111; the fan 114 is used for drawing the first polymer fibers and the second polymer fibers to the screen cloth 113, and the first polymer fibers and the second polymer fibers are sprayed through the spinneret to obtain fibers with a normal fiber diameter distribution, and then the prepared fibers are subjected to opening, vibration feeding, carding, web laying, glue spraying, drying, and polishing operations to obtain the nanofiber thermal insulation cotton.

[0091] The fibers with a normal fiber diameter distribution and an average fiber diameter of 0.8-1 μm prepared by the flash-blowing method are adjusted to have an apparent density of 0.001-0.003 g / cm 3 When the fibers have the following performance parameters:

[0092] Average fiber diameter: 0.8-1 μm;

[0093] Fiber diameter distribution: normal distribution;

[0094] Standard deviation: 0.3-0.4;

[0095] Fiber apparent density: 0.001-0.003 g / cm 3 Left and right;

[0096] Instantaneous rebound rate: > 85%.

[0097] It should be noted that the present application also optimizes the die and the spinneret by using 3D-CFD fluid analysis and a large number of experiments, so that the average fiber diameter of a plurality of high molecular materials can be controlled, and fibers with a certain ratio can be sprayed at one time to realize the control of the distribution and ratio of the fiber diameter.

[0098] The preparation method of the nanofiber thermal insulation cotton is as follows:

[0099] S1: EVA hot melt adhesive is added to polypropylene to prepare a first spinning solution, the viscosity of the prepared first spinning solution is adjusted to be less than 50 Pa·s in the range of a shear rate of 1000-100001 / s, and the melt-blowing device 11 is used for melt-blowing treatment of the first spinning solution to obtain first polymer fibers;

[0100] S2: adding decaline in polyethylene terephthalate to prepare a second spinning solution, adjusting the viscosity of the prepared second spinning solution to be less than 150 mPa·s in the range of 1000-100001 / s of shear rate, and performing flash evaporation treatment on the second spinning solution by using a flash evaporation device 111 to obtain a second polymer fiber;

[0101] S3: under the traction of the fan 114, mixing the first polymer fiber and the second polymer fiber by using multiple air nozzles 112 to obtain fibers with a normal fiber diameter distribution and an average fiber diameter of 0.8-1 μm, and then performing opening, vibration, carding, laying, glue spraying, drying, and polishing operations on the prepared fibers to obtain the nanofiber thermal insulation cotton.

[0102] In this embodiment, the material ratio of the first polymer fiber and the second polymer fiber when mixed uniformly by using multiple air nozzles 112 is (4-6):(4-6), and the total amount is 10.

[0103] Example 1

[0104] adding EVA hot melt adhesive in polypropylene to prepare a first spinning solution, adjusting the viscosity of the prepared first spinning solution to be less than 50 Pa·s in the range of 1000-100001 / s of shear rate, and performing melt blowing treatment on the first spinning solution by using a melt blowing device 11 to obtain a first polymer fiber;

[0105] adding decaline in polyethylene terephthalate to prepare a second spinning solution, adjusting the viscosity of the prepared second spinning solution to be less than 150 mPa·s in the range of 1000-100001 / s of shear rate, and performing flash evaporation treatment on the second spinning solution by using a flash evaporation device 111 to obtain a second polymer fiber;

[0106] under the traction of the fan 114, mixing the first polymer fiber and the second polymer fiber by using multiple air nozzles 112, and controlling the amount ratio of the first polymer fiber and the second polymer fiber to be 4:6, to obtain fibers with a normal fiber diameter distribution and an average fiber diameter of 0.8 μm, and then performing opening, vibration, carding, laying, glue spraying, drying, and polishing operations on the prepared fibers to obtain the nanofiber thermal insulation cotton.

[0107] Example 2

[0108] adding EVA hot melt adhesive in polypropylene to prepare a first spinning solution, adjusting the viscosity of the prepared first spinning solution to be less than 50 Pa·s in the range of 1000-100001 / s of shear rate, and performing melt blowing treatment on the first spinning solution by using a melt blowing device 11 to obtain a first polymer fiber;

[0109] A second polymer solution was prepared by adding decaline to polyethylene terephthalate, and the viscosity of the prepared second polymer solution was adjusted to less than 150 mPa s in the range of a shear rate of 1000-100001 / s, and the second polymer solution was subjected to flash treatment by using a flash device 111 to obtain a second polymer fiber;

[0110] Under the traction of the fan 114, the first polymer fiber and the second polymer fiber were uniformly mixed by using a plurality of air nozzles 112, and the use amount ratio of the first polymer fiber to the second polymer fiber was controlled to be 5:5, and the fibers with a normal fiber diameter distribution and an average fiber diameter of 1 μm were obtained by being sprayed through a spinneret, and then the prepared fibers were subjected to opening, vibration, carding, laying, glue spraying, drying and calendering operations to obtain the nanofiber thermal insulation cotton.

[0111] Example 3

[0112] A first polymer solution was prepared by adding EVA hot melt adhesive to polypropylene, and the viscosity of the prepared first polymer solution was adjusted to less than 50 Pa s in the range of a shear rate of 1000-100001 / s, and the first polymer solution was subjected to melt blowing treatment by using a melt blowing device 11 to obtain a first polymer fiber;

[0113] A second polymer solution was prepared by adding decaline to polyethylene terephthalate, and the viscosity of the prepared second polymer solution was adjusted to less than 150 mPa s in the range of a shear rate of 1000-100001 / s, and the second polymer solution was subjected to flash treatment by using a flash device 111 to obtain a second polymer fiber;

[0114] Under the traction of the fan 114, the first polymer fiber and the second polymer fiber were uniformly mixed by using a plurality of air nozzles 112, and the use amount ratio of the first polymer fiber to the second polymer fiber was controlled to be 6:4, and the fibers with a normal fiber diameter distribution and an average fiber diameter of 0.9 μm were obtained by being sprayed through a spinneret, and then the prepared fibers were subjected to opening, vibration, carding, laying, glue spraying, drying and calendering operations to obtain the nanofiber thermal insulation cotton.

[0115] The nanofiber thermal insulation cotton prepared in Comparative Examples 1-3 was sampled for 100 fibers, and the performance parameters of the fiber assembly were measured as follows:

[0116] Example 1 Example 2 Example 3 Average fiber diameter (pm) 0.8 1 0.9 Standard deviation 0.3 0.3 0.4 Fiber apparent density (g / cm 3 ) 0.001 0.002 0.003 Instantaneous resilience (%) 87 88 86

[0117] In summary, the average diameter of the prepared nanofiber is greater than 0.8 μm, the standard deviation is less than 0.4, the instantaneous resilience of the fiber is higher than 86%, the resilience effect is good, and the apparent density of the fiber is less than 0.003 g / cm 3, the ratio adopted in Example 2 is the optimal ratio, and the nanofiber thermal insulation cotton prepared by using the material ratio of Example 2 is detected, and the specific detection results are as shown in Table 2. Figures 18-21

[0118] In addition, the prepared nanofiber thermal insulation cotton of the present application is mainly used for outdoor cold-weather clothing, gloves, bedding, etc., and has a military-grade warming effect, and of course, can also be used as a building insulation material.

[0119] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application.​

Claims

1. A testing device for nanofiber thermal insulation cotton, characterized in that: The testing device is used for testing nanofiber thermal insulation cotton, and the testing device comprises: The rack (1) is provided with a U-shaped support (2) fixedly arranged on the top middle part of the rack (1), and a circular groove (3) is formed in the top end surface of the rack (1), the transposition disc (4) is movably sleeved in the circular groove (3), the driving motor one is fixedly installed at the bottom of the rack (1), the output shaft end of the driving motor one movably penetrates the rack (1), and the output shaft end of the driving motor one is fixedly connected with the transposition disc (4), and the two groups of film temperature sensors (5) are fixedly embedded on the top of the transposition disc (4); The U-shaped support (2) is provided with the detection driving assembly (6) on both sides, and the two detection driving assemblies (6) are centrally symmetrically arranged about the axis of the transposition disc (4), the transposition disc (4) is provided with the heat conductivity testing assembly (7) and the pressure testing assembly (8) at positions corresponding to the two detection driving assemblies (6) on the top, the cooling mechanism (9) is arranged between the heat conductivity testing assembly (7) and the pressure testing assembly (8), the two detection driving assemblies (6) are linked, the heat conductivity testing assembly (7) and the pressure testing assembly (8) respectively constitute the heat conductivity detection mechanism and the pressure detection mechanism with the detection driving assembly (6) at the corresponding position, and the wireless signal transmitter (10) is installed on the heat conductivity testing assembly (7) and the pressure testing assembly (8); The pressure testing assembly (8) comprises the top plate (81) fixedly connected to the detection driving assembly (6) at the corresponding position, the side surface of the top plate (81) is fixedly sleeved with the limiting frame (82), the cavity between the top plate (81) and the limiting frame (82) is provided with the pressing plate (83), the limiting frame (82) is provided with the angle plate (85) at the top corner position, and the pressing plate (83) is provided with the guide column (84) at the top corner position. The guide column (84) top end movably penetrates the top plate (81) and the corresponding position angle plate (85) in sequence, the guide column (84) top end surface is fixedly provided with a circular plate (86), the guide column (84) side surface is fixedly connected with the spring two (87) at the position between the angle plate (85) and the circular plate (86) at the position, the top plate (81) and the pressing plate (83) are provided with the pressure applying part, and the pressing plate (83) bottom is provided with the film pressure sensor two (810); The pressure applying part comprises the mandrel (88) rotatably installed on the limiting frame (82) through bearings, the mandrel (88) is fixedly sleeved with two groups of cams (89), each group has three cams (89), and the three cams (89) in each group are sequentially arranged in the axial direction of the mandrel (88) and sequentially reduced, and the limiting frame (82) is fixedly provided with the driving motor three on one side, and the output shaft end of the driving motor three is fixedly connected with one end of the mandrel (88). 2.The testing device of the nanofiber thermal insulation cotton according to claim 1, characterized in that: The thermal insulation cotton comprises the following components: polypropylene, polyethylene terephthalate, EVA hot melt adhesive and decalin. The EVA hot melt adhesive is added into the polypropylene to prepare a first spinning solution, the viscosity of the prepared first spinning solution is adjusted to be less than 50 Pa・s in the range of 1000-10000 1 / s, and the first polymer fiber is obtained by melt blowing the first spinning solution through a melt blowing device (11); The decalin is added into the polyethylene terephthalate to prepare a second spinning solution, the viscosity of the prepared second spinning solution is adjusted to be less than 150 mPa・s in the range of 1000-10000 1 / s, and the second polymer fiber is obtained by flash evaporation of the second spinning solution through a flash evaporation device (111); The first polymer fiber and the second polymer fiber are mixed uniformly by a plurality of air nozzles (112) under the traction of a fan (114), and the fiber with a normal fiber diameter distribution and an average fiber diameter of 0.8-1 μm is obtained by jetting through a spinneret, and then the prepared fiber is subjected to opening, vibration feeding, carding, web laying, glue spraying, drying and calendering to obtain the nanofiber thermal insulation cotton. 3.The testing device of the nanofiber thermal insulation cotton according to claim 1, characterized in that: The detection driving assembly (6) comprises a horizontal plate (61) fixed on the side of the U-shaped support (2) and two vertical plates (62) fixed on the inner top surface of the U-shaped support (2), one end of the horizontal plate (61) away from the U-shaped support (2) is movably penetrated by a vertical shaft (63), the outer circumferential surface of the top end of the vertical shaft (63) is fixedly sleeved with two limiting flanges (64) respectively abutting with the upper surface and the lower surface of the horizontal plate (61), and a linkage part is arranged between the vertical shafts (63) of the two detection driving assemblies (6); A deflection part is arranged between the vertical plate (62) of the detection driving assembly (6) and the rack (1), the deflection part comprises a side plate (615) fixed on the top of the rack (1) and a deflection rod (69) rotatably installed between the two vertical plates (62) in a penetrating mode through bearings, and the outer circumferential surface of the deflection rod (69) is fixedly sleeved with a deflection block (610) at the position between the two vertical plates (62); The deflection block (610) is fixedly connected with a swing rod (611) and a ball seat rod at the middle part of the two sides, respectively, the end of the ball seat rod is fixedly connected with a ball (612), the outer circumferential surface of one end of the deflection rod (69) close to the position of the side plate (615) is fixedly provided with a U-shaped rod (613), the middle part of the U-shaped rod (613) is movably sleeved with a sleeve ring (614), and the sleeve ring (614) is fixedly connected with the side plate (615) through a spring (616).

4. The testing device of the nanofiber thermal insulation cotton according to claim 3, characterized in that: The linkage part comprises a driving motor two fixedly installed at the center position of the top of the U-shaped support (2), the output shaft end of the driving motor two is movably penetrated through the U-shaped support (2), and the output shaft end of the driving motor two is fixedly connected with a driving wheel (67), the outer circumferential surface of each of the two vertical shafts (63) is fixedly sleeved with a driven wheel (68) at the position corresponding to the driving wheel (67), and the two driven wheels (68) and the driving wheel (67) are connected through a belt transmission.

5. The testing device of the nanofiber thermal insulation cotton according to claim 3, characterized in that: The vertical shaft (63) bottom end fixedly connected with a rotating disc (65), the rotating disc (65) bottom end face edge position is fixedly provided with an arc convex plate (66), the arc convex plate (66) bottom middle part and the rotating disc (65) bottom end face edge far away from the arc convex plate (66) one end are all installed with a film pressure sensor one (617).

6. The testing device of nanofiber thermal insulation cotton according to claim 3, characterized in that: The heat conduction test assembly (7) includes an isolation cover (73) fixedly connected to the end of the swing rod (611) of the corresponding position detection driving assembly (6), a gas cylinder (72) is fixedly installed at the top center of the inner cavity of the isolation cover (73), and the telescopic end of the gas cylinder (72) is fixedly connected with an electric heating plate (71). 7.The testing device of the nanofiber thermal insulation cotton according to claim 1, characterized in that: The cooling mechanism (9) comprises an L-shaped support (91) fixed to the top of the rack (1), an annular fan plate (92) in a hollow structure is fixedly connected to the inner top end face of the L-shaped support (91), a plurality of air outlet grooves (93) are formed in the bottom end face of the annular fan plate (92), and the L-shaped support (91) is provided with an air pump (94) and a press switch (95).

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