A method for producing a high temperature resistant film of a quasi-cyclic block copolymer

Abstract

The present invention belongs to the technical field of functional polymer materials, and in particular, relates to a method for producing a high temperature resistant film of a quasi-cyclic block copolymer, comprising: S1. mixing the quasi-cyclic block copolymer and polypropylene in proportion by melt mixing or mechanical mixing; S2. selecting an extrusion, cast film or blown film process to form the mixed material into a film; S3. conducting a comprehensive performance test on the film produced in S2. The present invention designs and synthesizes a block copolymer with a unique cyclic structure, which can significantly improve the thermal stability and mechanical properties of the material, while enhancing the compatibility of the quasi-cyclic block copolymer with a polypropylene substrate, and by setting a multi-position testing mechanism, the tensile strength of the film can be tested from multiple positions without affecting the previous test position of the film.

Description

Technical Field

[0001] The invention belongs to the technical field of functional polymer materials, and in particular relates to a method for producing a high temperature resistant film of a quasi-cyclic block copolymer. Background Art

[0002] Copolymer film is a polymer film synthesized by copolymerization of two or more different monomers. Generally, copolymers are composed of polymer chains synthesized by copolymerization of different monomer units. The structure and properties of these monomer units determine the performance of the copolymer. Copolymer film has a wide range of applications because it can combine the advantages of different monomers, especially in the fields of electronics, optics, packaging, etc.

[0003] Many existing copolymer films have lower thermal stability than homopolymers and are easily degraded or deformed under high temperature conditions. In addition, the compatibility between different monomers is poor, especially for copolymers composed of multiple monomers, which leads to the separation of copolymers and affects the mechanical and chemical properties of the film.

[0004] At the same time, existing copolymer films often need to be tested for tensile strength after processing. However, the elastic modulus of the copolymer film may vary in different regions, resulting in different elongations in different regions during the stretching process, affecting the overall tensile strength test. Summary of the invention

[0005] The purpose of the present invention is to provide a block copolymer with a unique cyclic structure to address the problems raised in the above background technology, significantly improve the thermal stability and mechanical properties of the material, and at the same time enhance the compatibility of the quasi-cyclic block copolymer with a polypropylene substrate to produce a high-temperature resistant film of the quasi-cyclic block copolymer.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for producing a high temperature resistant film of a quasi-cyclic block copolymer, comprising:

[0008] S1. The cyclic block copolymer and polypropylene are mixed in proportion by melt mixing or mechanical mixing;

[0009] S2. Select extrusion, casting or blown film process to form the mixed material into a film;

[0010] S3. Conducting a comprehensive performance test on the film produced in S2;

[0011] Wherein, the ratio of the quasi-cyclic block copolymer to polypropylene in S1 is 0%-20%:100%-80%;

[0012] The quasi-cyclic block copolymer high temperature resistant film produced by the above method comprises a quasi-cyclic block copolymer, polypropylene, a toughening agent and an antioxidant;

[0013] Wherein, the quasi-cyclic block copolymer is synthesized by block polymerization of at least one polypropylene-based monomer and at least one quasi-cyclic monomer;

[0014] Wherein, the polypropylene-based monomer is a monomer containing a propylene group, and the quasi-cyclic monomer is a quasi-cyclic structure monomer of a polyolefin;

[0015] Among them, the comprehensive performance test of S3 includes a tensile strength test of the film by a testing device, and the testing device includes:

[0016] Test box;

[0017] A multi-position testing mechanism, the multi-position testing mechanism is provided with two groups and symmetrically arranged inside the test box, and is used to test the tensile strength of the film from multiple positions. The multi-position testing mechanism includes a U-shaped plate slidably connected to the inner wall of the test box in the vertical direction, and two movable plates are airtightly and symmetrically slidably connected inside the U-shaped plate in the horizontal direction. The lower ends of the two movable plates are symmetrically provided with a first pull plate, a second pull plate and a third pull plate, and the third pull plate is arranged outside. The first pull plate, the second pull plate and the third pull plate are all airtightly slidably connected to the inner wall of the U-shaped plate, the upper end of the first pull plate is provided with a first clamping plate, and the upper ends of the second and third pull plates are provided with a second clamping plate. The lower wall of the movable plate is provided with a clamping groove that is airtightly engaged with the first clamping plate and the second pull plate. The first and second pull plates are both provided with a disengagement component inside, which is used to fix the film from this position after the first and second pull plates are stretched, and the second and third pull plates are provided with a stretching component, which is used to stretch the film from the next station after the first and second pull plates are fixed.

[0018] Preferably, the disengagement assembly includes a guide groove opened inside the first pull plate and the second pull plate, the guide groove is slidably connected with a push plate in the horizontal direction, and the guide groove is slidably connected with a trapezoidal push block in the vertical direction, the push plate is rotatably connected with a guide wheel at one end close to the trapezoidal push block, the guide wheel is in rolling contact with the trapezoidal push block, the upper end of the trapezoidal push block is fixedly connected with an extension rod, the upper end of the extension rod is fixedly connected with the first clamping plate and the second clamping plate at corresponding positions, a first spring is provided between the trapezoidal push block and the bottom wall of the guide groove, two sliding grooves are provided on the side wall of the U-shaped plate, a wedge block is slidably connected in the sliding groove, a second spring is provided between the wedge block and the inner wall of the sliding groove, and a side wall of the wedge block close to the center position of the test box is inclined.

[0019] Preferably, the stretching assembly includes rollers rotatably connected to the side walls of the second pull plate and the third pull plate, and the side walls of the U-shaped plate are provided with a first roller groove and a second roller groove, and the rollers on the second pull plate and the third pull plate roll along the first roller groove and the second roller groove respectively, and the first roller groove is divided into two first straight sections staggered up and down and a second inclined section connecting the two first straight sections, and the second roller groove is divided into two second straight sections staggered up and down and a second inclined section connecting the two second straight sections, and the length of the second straight section of the second roller groove close to the first roller groove is greater than the length of the first straight section on the first roller groove.

[0020] Preferably, the lengths of the second pull plate and the third pull plate are shorter than the length of the first pull plate, and the lengths of the second clamping plates on the second pull plate and the third pull plate are longer than the length of the first clamping plate on the first pull plate.

[0021] Compared with the existing technology, the production method of this type of cyclic block copolymer high temperature resistant film has the following advantages:

[0022] 1. The present invention can evaluate the compatibility of the copolymer with polypropylene according to the chemical structure of polypropylene through solubility parameters and interfacial tension, test the melting point and thermal stability of the material through differential scanning calorimetry and thermogravimetric analysis, mix the cyclic block copolymer with the polypropylene resin in different proportions, and select a suitable molding process, so as to design and synthesize a block copolymer with a unique cyclic structure, significantly improve the thermal stability and mechanical properties of the material, and enhance the compatibility of the quasi-cyclic block copolymer with the polypropylene substrate.

[0023] 2. The present invention sets a multi-position testing mechanism. When the tensile strength of the film is tested, the first pulling plates on both sides move away from each other, and the tensile strength test of the film is performed from the initial position. Then, the first pulling plate is fixed at the wedge block, and the continued movement of the moving plate will drive the second pulling plates on both sides to continue to move away from each other. The second pulling plate first squeezes the film, and then the squeezing of the film is maintained to perform the tensile strength test from the next position. Then, the second pulling plate is fixed, and the continued movement of the moving plate will drive the third pulling plates on both sides to continue to move away from each other, and the tensile strength test of the film is performed at the next position. The tensile strength test of the film is performed from multiple positions without affecting the last test position of the film, thereby achieving the effect of multi-position tensile strength detection and improving the accuracy of the overall tensile strength test.

[0024] 3. The present invention sets an air detection mechanism. During the tensile strength test of each position of the film, the two movable plates at the top move away from each other, causing the piston plate to move in the exhaust chamber, and then discharge the air in the exhaust chamber through the exhaust port to the space above the film. Through the change of air pressure in the space below the film, it is detected whether the surface of the film at the test position is intact during the test, thereby reducing the error of the tensile test of the film.

[0025] 4. The present invention provides an air detection mechanism. After the air is discharged into the space above the film, if there are defects on the surface of the film, the air can enter the space below the film and further enter the air pressure channel, causing the piston block in the air pressure channel to move, and further causing the indicator needle to move. The position indicated by the indicator needle on the scale can detect the degree of defects on the film surface, and based on the degree of defects on the film surface, it can be detected whether the copolymer film meets the specified standards, thereby ensuring the quality of the produced copolymer film. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the testing device in the present invention;

[0027] Figure 2 It is a schematic diagram of the partial structure inside the test box of the present invention;

[0028] Figure 3 It is a schematic diagram of the cross-sectional structure of the U-shaped plate in the present invention;

[0029] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0030] Figure 5 It is a schematic diagram of the cross-sectional structure of the movable plate in the present invention;

[0031] Figure 6 It is a schematic cross-sectional structure diagram of the second pull plate in the present invention;

[0032] Figure 7 It is a partial structural schematic diagram of the feedback mechanism in the present invention.

[0033] In the figure: 1, test box; 2, multi-position test mechanism; 21, U-shaped plate; 22, moving plate; 23, first pull plate; 24, second pull plate; 25, third pull plate; 26, first clamping plate; 27, clamping groove; 28, disengagement assembly; 281, guide groove; 282, push plate; 283, guide wheel; 284, extension rod; 285, first spring; 286, slide groove; 287, wedge block; 288, trapezoidal push block; 29, stretching assembly; 291, roller; 292, first roller groove; 293, second roller groove; 294, first straight section; 295, first inclined section; 296, second straight Segment; 297, second inclined segment; 210, second clamping plate; 3, driving mechanism; 31, cylinder; 32, L-shaped rod; 33, guide rail; 34, threaded rod; 35, motor; 36, lifting block; 37, first hinge seat; 38, second hinge seat; 39, connecting rod; 4, air detection mechanism; 41, mounting plate; 42, push rod; 43, exhaust chamber; 44, moving block; 45, piston plate; 46, third spring; 47, exhaust port; 48, baffle; 5, feedback mechanism; 51, air pressure channel; 52, piston block; 53, fixing rod; 54, indicator needle; 55, scale ruler; 56, reset spring. DETAILED DESCRIPTION

[0034] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0035] Example:

[0036] A method for producing a high temperature resistant film of a cyclic block copolymer, comprising:

[0037] S1. The cyclic block copolymer and polypropylene are mixed in proportion by melt mixing or mechanical mixing;

[0038] S2. Select extrusion, casting or blown film process to form the mixed material into a film;

[0039] S3. Conducting a comprehensive performance test on the film produced in S2;

[0040] Wherein, the ratio of the quasi-cyclic block copolymer to polypropylene in S1 is 0%-20%:100%-80%;

[0041] Specifically, the cyclic block copolymer and the polypropylene resin are mixed in different proportions. The higher the proportion of the cyclic block copolymer, the smaller the corresponding heat shrinkage rate, as shown in the following table:

[0042]

[0043] The quasi-cyclic block copolymer high temperature resistant film produced by the above method comprises a quasi-cyclic block copolymer, polypropylene, a toughening agent and an antioxidant;

[0044] Wherein, the quasi-cyclic block copolymer is synthesized by block polymerization of at least one polypropylene-based monomer and at least one quasi-cyclic monomer;

[0045] Wherein, the polypropylene-based monomer is a monomer containing a propylene group, and the quasi-cyclic monomer is a quasi-cyclic structure monomer of a polyolefin;

[0046] Aiming at the problem that many copolymer films in the prior art have lower thermal stability than homopolymers, are easily degraded or deformed in high temperature environments, and have poor compatibility between different monomers, especially for copolymers composed of multiple monomers, which leads to separation of the copolymers and affects the mechanical and chemical properties of the film, the present invention can evaluate the compatibility of the copolymer with polypropylene according to the chemical structure of polypropylene through solubility parameters and interfacial tension, test the melting point and thermal stability of the material through differential scanning calorimetry and thermogravimetric analysis, mix the cyclic block copolymer with the polypropylene resin in different proportions, select a suitable molding process, and thus design and synthesize a block copolymer with a unique cyclic structure, significantly improve the thermal stability and mechanical properties of the material, and enhance the compatibility of the quasi-cyclic block copolymer with a polypropylene substrate.

[0047] Reference Figures 1 to 7 The comprehensive performance testing of S3 includes tensile strength testing of the film using a test rig that includes:

[0048] Test box 1;

[0049] A multi-position testing mechanism 2, the multi-position testing mechanism 2 is provided with two groups and symmetrically arranged inside the test box 1, and is used to test the tensile strength of the film from multiple positions. The multi-position testing mechanism 2 includes a U-shaped plate 21 slidably connected to the inner wall of the test box 1 in the vertical direction, and two movable plates 22 are symmetrically slidably connected in the horizontal direction in the U-shaped plate 21. The lower ends of the two movable plates 22 are symmetrically provided with a first pull plate 23, a second pull plate 24 and a third pull plate 25, and the third pull plate 25 is arranged outside. The first pull plate 23, the second pull plate 24 and the third pull plate 25 are all slidably connected to the inner wall of the U-shaped plate 21 in an airtight manner. The first pull plate 23 is connected with a first clamping plate 26 at the upper end, and the second pull plate 24 and the third pull plate 25 are provided with a second clamping plate 210 at the upper ends. The lower wall of the movable plate 22 is provided with a clamping groove 27 which is airtightly engaged with the first clamping plate 26 and the second clamping plate 210. The first pull plate 23 and the second pull plate 24 are both provided with a disengagement assembly 28 inside, which is used to fix the film from this position after the first pull plate 23 and the second pull plate 24 are stretched. The second pull plate 24 and the third pull plate 25 are provided with a stretching assembly 29, which is used to stretch the film from the next station after the first pull plate 23 and the second pull plate 24 are fixed.

[0050] Specifically, opening and closing doors are provided on both side outer walls of the test box 1 for conveying the film into the test box 1 before testing.

[0051] Specifically, the disengagement assembly 28 includes a guide groove 281 provided inside the first pull plate 23 and the second pull plate 24, a push plate 282 is slidably connected in the guide groove 281 along the horizontal direction, a trapezoidal push block 288 is slidably connected in the guide groove 281 along the vertical direction, the push plate 282 is rotatably connected to one end of the trapezoidal push block 288 close to the trapezoidal push block 288, the guide wheel 283 is in rolling contact with the trapezoidal push block 288, an extension rod 284 is fixedly connected to the upper end of the trapezoidal push block 288, the upper end of the extension rod 284 is fixedly connected to the first clamping plate 26 and the second clamping plate 210 at the corresponding positions, a first spring 285 is provided between the trapezoidal push block 288 and the inner bottom wall of the guide groove 281, two slide grooves 286 are provided on the side wall of the U-shaped plate 21, a wedge block 287 is slidably connected in the slide groove 286, a second spring is provided between the wedge block 287 and the inner wall of the slide groove 286, and a side wall of the wedge block 287 close to the center position of the test box 1 is inclined.

[0052] Specifically, the stretching assembly 29 includes a roller 291 rotatably connected to the side walls of the second pull plate 24 and the third pull plate 25. The side walls of the U-shaped plate 21 are provided with a first roller groove 292 and a second roller groove 293. The rollers 291 on the second pull plate 24 and the third pull plate 25 roll along the first roller groove 292 and the second roller groove 293 respectively. The first roller groove 292 is divided into two first straight sections 294 staggered up and down and a first inclined section 295 connecting the two first straight sections 294. The second roller groove 293 is divided into two second straight sections staggered up and down. 296 and a second inclined section 297 connecting the two second straight sections 296, the length of the second straight section 296 of the second roller groove 293 close to the first roller groove 292 is greater than the length of the first straight section 294 on the first roller groove 292, so that when the second pull plate 24 and the third pull plate 25 are rolling and the film is stretched, they will first roll along the first inclined section 295 and the second inclined section 297 to approach the film to achieve clamping of the film, and then the film will be stretched under the action of the first straight section 294 and the second straight section 296.

[0053] Specifically, the length of the second pull plate 24 and the third pull plate 25 is smaller than that of the first pull plate 23, and the length of the second clamping plate 210 on the second pull plate 24 and the third pull plate 25 is larger than the length of the first clamping plate 26 on the first pull plate 23, so that when the roller 291 rolls along the first roller groove 292 and the second roller groove 293, the second pull plate 24 and the third pull plate 25 will not immediately fall off from the clamping groove 27, and the second pull plate 24 and the third pull plate 25 will not separate from the movable plate 22 during stretching of the film, thereby ensuring the stretching test of the film.

[0054] In view of the problem that the copolymer film in the prior art often needs to be tested for tensile strength after processing, the elastic modulus of the copolymer film may be different in different regions, resulting in different elongations in different regions during the stretching process, which affects the overall tensile strength test, the present invention solves the above problem by setting a multi-position testing mechanism 2:

[0055] When the tensile strength test of the film is performed, the two U-shaped plates 21 are first driven to approach each other, so that the upper and lower first pull plates 23 are approached to each other to squeeze and fix the film, and then the movable plates 22 on both sides are driven to move away from each other, driving the first pull plates 23 on both sides to move away from each other, and the tensile strength test of the film is performed from the initial position. When the first pull plate 23 moves to contact the wedge block 287, it pushes the wedge block 287 into the slide groove 286, and then the wedge block 287 automatically pops out into the guide groove 281 under the elastic force of the second spring, pushing the push plate 282 in the guide groove 281, and further pushing the trapezoidal push block 288 downward through the guide wheel 283, so that the first clamping plate 26 on the first pull plate 23 is retracted from the clamping groove 27 into the first pull plate 23, so that the first pull plate 23 is fixed at the wedge block 287;

[0056] Then the movable plate 22 continues to drive the second pull plates 24 on both sides to continue to move away from each other, and the roller 291 on the second pull plate 24 moves along the first roller groove 292, so that the second pull plate 24 can first move downward along the first inclined section 295 of the first roller groove 292 by a distance of a station. When the second pull plate 24 moves to the bottom end and is level with the bottom end of the first pull plate 23, the second pull plate 24 squeezes the film. At this time, the second clamping plate 210 on the second pull plate 24 is not completely retracted from the movable plate 22, so that the second pull plate 24 moves along the first straight section 294 away from one end of the two first roller grooves 292, maintaining the squeezing of the film to perform a tensile strength test on the film at the next position. When the roller 291 on the second pull plate 24 moves to the end of the first straight section 294, another wedge block 287 enters the guide groove 281, and the operation is the same as the first pull plate 23 to fix the second pull plate 24.

[0057] Then, the continued movement of the movable plate 22 will drive the third pull plates 25 on both sides to continue to move away from each other. Similar to the operation of the second pull plate 24, the movable plate 22 will continue to drive the third pull plates 25 on both sides to continue to move away from each other. The roller 291 on the third pull plate 25 moves along the second roller groove 293, so that the third pull plate 25 can first move downward along the second inclined section 297 of the second roller groove 293 by a distance of one station. When the third pull plate 25 moves to the bottom end and is level with the bottom ends of the first pull plate 23 and the second pull plate 24, the third pull plate 25 squeezes the film. The third pull plate 25 moves along the second straight section 296 of the two second roller grooves 293 away from one end, and keeps squeezing the film to perform a tensile strength test on the film at the next position.

[0058] In summary, the tensile strength of the film can be tested from multiple positions without affecting the last test position of the film, thereby achieving the effect of multi-position tensile strength testing and improving the accuracy of the overall tensile strength test.

[0059] The test box 1 is provided with a driving mechanism 3, which has two groups and is symmetrically arranged inside the test box 1, and is used to drive the two U-shaped plates 21 to approach each other and then drive the two moving plates 22 on the U-shaped plates to move away from each other. The driving mechanism 3 includes a cylinder 31 fixedly connected to the inner wall of the test box 1, and the output end of the cylinder 31 is fixedly connected to the U-shaped plate 21. Two L-shaped rods 32 are fixedly connected to the U-shaped plate 21. The two L-shaped rods 32 extend outside the test box 1 and are fixedly connected to a guide rail 33. A threaded rod 34 is rotatably connected inside the guide rail 33, a motor 35 for driving the threaded rod 34 is fixedly connected to the upper end of the guide rail 33, a lifting block 36 threadedly engaged with the threaded rod 34 is slidably connected to the inner side wall of the guide rail 33 in the vertical direction, the two movable plates 22 on the U-shaped plate 21 are extended to the outside of the test box 1, and are fixedly connected to a first hinge seat 37, and second hinge seats 38 are provided on both side walls of the lifting block 36, and connecting rods 39 are provided between the first hinge seat 37 and the corresponding second hinge seat 38.

[0060] During the actual test, the two cylinders 31 are driven to work at the same time, so that the two U-shaped plates 21 are close to each other, and the two first pulling plates 23 are squeezed onto the film. Then, the two motors 35 are driven to work at the same time, so that the two lifting blocks 36 move towards each other synchronously, and further the two moving plates 22 are driven away from each other through the first hinge seat 37, the second hinge seat 38 and the connecting rod 39, thereby realizing the film surface tensile strength test and the subsequent film surface integrity test.

[0061] The test box 1 is provided with two air detection mechanisms 4 controlled by the movable plate 22, which are used to detect the surface of the film test position during the tensile strength test. The air detection mechanism 4 includes a mounting plate 41 fixedly connected to the top wall of the test box 1, and a push rod 42 is fixedly connected to one end of the mounting plate 41 close to the movable plate 22. An exhaust chamber 43 is provided inside the movable plate 22, and a moving block 44 fixedly connected to the push rod 42 is slidably connected inside the exhaust chamber 43. A piston plate 45 is airtightly slidably connected inside the exhaust chamber 43, and a third spring 46 is provided between the piston plate 45 and the moving block 44. An air inlet connected to the outside is provided on one side of the exhaust chamber 43 close to the mounting plate 41, and an exhaust port 47 is provided on the bottom wall of the exhaust chamber 43. Both the air inlet and the exhaust port 47 are provided with a one-way valve. A plurality of baffles 48 are airtightly slidably connected to the U-shaped plate 21 for sealing the pull plate at the corresponding position after fixing.

[0062] Specifically, the third spring 46 between the moving block 44 and the piston plate 45 has a buffering effect, and is used to properly buffer the air when the air cannot be discharged from the exhaust port 47 and the card slot 27 .

[0063] Specifically, a tension spring is provided between the plurality of baffles 48 and the U-shaped plate 21. When any of the pull plates (including the first pull plate 23, the second pull plate 24 and the third pull plate 25) falls off the movable plate 22, the baffles 48 can automatically approach each other under the elastic force of the tension spring, and timely contact the pull plates at the corresponding positions to close the previous tensile test position, so as to avoid affecting the detection effect of the film surface at the next tensile test position.

[0064] Specifically, a limiting groove is provided on the outer wall of the test box 1 , and when the U-shaped plates 21 are close to each other, the air pressure channel 51 can be driven to slide in the limiting groove to avoid motion interference.

[0065] Specifically, two sealing plates are fixedly connected to the center of the inner wall of the test box 1, and the upper and lower ends of the sealing plates are elastically connected to abutment plates, which are in sealing contact with the side walls of the U-shaped plate 21 at corresponding positions to ensure the sealing effect in each test space.

[0066] It is worth mentioning that the present invention sets an air detection mechanism 4. During the tensile strength test of each position of the film, the two movable plates 22 at the top move away from each other, which will cause the piston plate 45 to move in the exhaust chamber 43, and then discharge the air in the exhaust chamber 43 through the exhaust port 47 to the space above the film. Through the change of air pressure in the space below the film, it is detected whether the surface of the film at the test position is intact during the test. When the film surface is intact, the air pressure in the space below the film will not change, and the film tensile test result at this position is of reference value. When there are defects on the film surface, the air pressure in the space below the film changes, and the film tensile test result at this position is not of reference value, thereby reducing the error of the film tensile test.

[0067] The test box 1 is also provided with a plurality of feedback mechanisms 5 distributed in a linear array, which are used to provide feedback on the surface of each position of the tested film. The feedback mechanism 5 includes an air pressure channel 51 fixedly connected to the side wall of the U-shaped plate 21 and connected to the outside of the test box 1. A piston block 52 is air-tightly slidably connected to the inside of the air pressure channel 51 in a horizontal direction. A fixing rod 53 is fixedly connected to the piston block 52. An indicator needle 54 is fixedly connected to the portion of the fixing rod 53 extending outside the air pressure channel 51. A scale 55 used in conjunction with the indicator needle 54 is provided on the outer wall of the test box 1. A fixing block is provided on the outer wall of the air pressure channel 51. A reset spring 56 is provided between the indicator needle 54 and the fixing block.

[0068] It should also be noted that the present invention provides an air detection mechanism 4. When the air is discharged into the space above the film, if there are defects on the surface of the film, the air can enter the space below the film and further enter the air pressure channel 51, causing the piston block 52 in the air pressure channel 51 to move, and further causing the indicator needle 54 to move. The position indicated by the indicator needle 54 on the scale 55 can detect the degree of defects on the film surface, and based on the degree of defects on the film surface, it can be detected whether the copolymer film meets the specified standards, thereby ensuring the quality of the produced copolymer film.

[0069] The present invention can be explained by the following operation mode:

[0070] During the test, the two cylinders 31 are driven to work at the same time, so that the two U-shaped plates 21 are moved closer to each other, and the two first pulling plates 23 are pressed against the film. Then, the two motors 35 are driven to work at the same time, so that the two lifting blocks 36 move closer to each other synchronously, and further the two moving plates 22 are driven to move away from each other through the first hinge seat 37, the second hinge seat 38 and the connecting rod 39.

[0071] The moving plates 22 move away from each other, which will drive the first pull plates 23 on both sides to move away from each other, and the tensile strength test of the film will be performed from the initial position. When the first pull plate 23 moves to the position of the wedge block 287, the wedge block 287 fixes the first pull plate 23; then the moving plate 22 continues to drive the second pull plates 24 on both sides to continue to move away from each other, and the second pull plates 24 first squeeze the film, and then keep squeezing the film to perform the tensile strength test of the film at the next position, and then fix the second pull plate 24 in the same way as the first pull plate 23; finally, the moving plate 22 continues to move, which will drive the third pull plates 25 on both sides to continue to move away from each other, and the operation is the same as the second pull plate 24, and the squeezing of the film is maintained to perform the tensile strength test of the film at the next position;

[0072] The two movable plates 22 move away from each other, causing the piston plate 45 to move in the exhaust chamber 43, thereby exhausting the air in the exhaust chamber 43 through the exhaust port 47 to the space above the film. The change in air pressure in the space below the film can be used to detect whether the film surface at the test position is intact during the test.

[0073] If there are defects on the surface of the film, air can enter the space below the film and further enter the air pressure channel 51, causing the piston block 52 in the air pressure channel 51 to move, and further causing the indicator needle 54 to move. The degree of defects on the surface of the film can be detected by the position indicated by the indicator needle 54 on the scale 55.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A test device for high temperature resistant film of quasi-cyclic block copolymer, characterized in that: include: Test box (1); A multi-position testing mechanism (2), wherein the multi-position testing mechanism (2) is provided with two groups and symmetrically arranged inside a testing box (1), and is used to perform a tensile strength test on a film from multiple positions, wherein the multi-position testing mechanism (2) comprises a U-shaped plate (21) slidably connected to the inner wall of the testing box (1) in a vertical direction, wherein two movable plates (22) are symmetrically slidably connected in an airtight manner in a horizontal direction inside the U-shaped plate (21), and a first pulling plate (23), a second pulling plate (24) and a first pulling plate (25) are symmetrically arranged at the lower ends of the two movable plates (22). Three pull plates (25), with the third pull plate (25) being arranged outside, the first pull plate (23), the second pull plate (24) and the third pull plate (25) being all airtightly slidably connected to the inner wall of the U-shaped plate (21), a first clamping plate (26) being provided at the upper end of the first pull plate (23), a second clamping plate (210) being provided at the upper ends of the second pull plate (24) and the third pull plate (25), and a clamping groove (27) being airtightly engaged with the first clamping plate (26) and the second clamping plate (210) being provided on the lower wall of the movable plate (22); The disengagement assembly (28) comprises a guide groove (281) provided inside the first pull plate (23) and the second pull plate (24), a push plate (282) being slidably connected in the horizontal direction in the guide groove (281), a trapezoidal push block (288) being slidably connected in the vertical direction in the guide groove (281), a guide wheel (283) being rotatably connected to one end of the push plate (282) close to the trapezoidal push block (288), the guide wheel (283) being in rolling contact with the trapezoidal push block (288), and an extension rod (284) being fixedly connected to the upper end of the trapezoidal push block (288) ), the upper end of the extension rod (284) is fixedly connected to the first clamping plate (26) and the second clamping plate (210) at corresponding positions, a first spring (285) is provided between the trapezoidal push block (288) and the inner bottom wall of the guide groove (281), two slide grooves (286) are provided on the side wall of the U-shaped plate (21), a wedge block (287) is slidably connected in the slide groove (286), a second spring is provided between the wedge block (287) and the inner wall of the slide groove (286), and a side wall of the wedge block (287) close to the center position of the test box (1) is inclined. The stretching assembly (29) comprises a roller (291) rotatably connected to the side walls of the second pull plate (24) and the third pull plate (25), and a first roller groove (292) and a second roller groove (293) formed on the side wall of the U-shaped plate (21), the first roller groove (292) and the second roller groove (293) comprising a straight section and an inclined section. The first roller groove (292) and the second roller groove (293) cooperate with the roller (291), so that when the second pull plate (24) and the third pull plate (25) are subjected to a stretching test on the film, they first approach the film along the inclined section to clamp the film, and then stretch the film under the action of the straight section.

2. The testing device for the high temperature resistant film of the quasi-cyclic block copolymer according to claim 1, characterized in that: The lengths of the second pull plate (24) and the third pull plate (25) are shorter than the length of the first pull plate (23), and the lengths of the second clamping plates (210) on the second pull plate (24) and the third pull plate (25) are longer than the length of the first clamping plate (26) on the first pull plate (23).

3. The testing device for the high temperature resistant film of the quasi-cyclic block copolymer according to claim 2, characterized in that: The test box (1) is provided with a driving mechanism (3), the driving mechanism (3) comprising two groups which are symmetrically arranged in the test box (1) and are used to drive the two U-shaped plates (21) to approach each other and then drive the two movable plates (22) on the U-shaped plates to move away from each other, the driving mechanism (3) comprising a cylinder (31) fixedly connected to the inner wall of the test box (1), the output end of the cylinder (31) being fixedly connected to the U-shaped plate (21), the U-shaped plate (21) being fixedly connected to two L-shaped rods (32), the two L-shaped rods (32) extending outside the test box (1) and being fixedly connected to guide rails (33), the A threaded rod (34) is rotatably connected inside the guide rail (33), a motor (35) for driving the threaded rod (34) is fixedly connected to the upper end of the guide rail (33), a lifting block (36) threadedly engaged with the threaded rod (34) is slidably connected to the inner side wall of the guide rail (33) in a vertical direction, the two movable plates (22) on the U-shaped plate (21) both extend outside the test box (1) and are symmetrically fixedly connected to a first hinge seat (37), second hinge seats (38) are symmetrically provided on both side walls of the lifting block (36), and a connecting rod (39) is hingedly connected between the first hinge seat (37) and the second hinge seat (38) at a corresponding position.

4. The testing device for the high temperature resistant film of the quasi-cyclic block copolymer according to claim 3, characterized in that: The test box (1) is provided with two air detection mechanisms (4) controlled by a movable plate (22) for detecting the surface of a film test position during a tensile strength test. The air detection mechanism (4) comprises a mounting plate (41) fixedly connected to the top wall of the test box (1), a push rod (42) fixedly connected to one end of the mounting plate (41) close to the movable plate (22), an exhaust cavity (43) is provided inside the movable plate (22), and a push rod (42) is slidably connected to the exhaust cavity (43). A movable block (44) is fixedly connected, a piston plate (45) is airtightly slidably connected inside the exhaust chamber (43), a third spring (46) is provided between the piston plate (45) and the movable block (44), an air inlet connected to the outside is provided on a side of the exhaust chamber (43) close to the mounting plate (41), an exhaust port (47) is provided on the bottom wall of the exhaust chamber (43), both the air inlet and the exhaust port (47) are provided with a one-way valve, and a plurality of baffles (48) are airtightly slidably connected to the U-shaped plate (21).

5. The testing device for the high temperature resistant film of the quasi-cyclic block copolymer according to claim 4, characterized in that: The test box (1) is further provided with a plurality of feedback mechanisms (5) distributed in a linear array for providing feedback on the surface of each position of the tested film. The feedback mechanism (5) comprises an air pressure channel (51) fixedly connected to the side wall of the U-shaped plate (21) and communicating with the outside of the test box (1). A piston block (52) is airtightly slidably connected to the inside of the air pressure channel (51) in a horizontal direction. A fixing rod (53) is fixedly connected to the piston block (52). An indicator needle (54) is fixedly connected to the portion of the fixing rod (53) extending outside the air pressure channel (51). A scale (55) for use with the indicator needle (54) is provided on the outer wall of the test box (1). A fixing block is provided on the outer wall of the air pressure channel (51). A reset spring (56) is provided between the indicator needle (54) and the fixing block.

6. A method for producing a high temperature resistant film of a quasi-cyclic block copolymer, characterized in that: include: S1. The cyclic block copolymer and polypropylene are mixed in proportion by melt mixing or mechanical mixing; S2. Select extrusion, casting or blown film process to form the mixed material into a film; S3. Conducting a comprehensive performance test on the film produced in S2; Wherein, the ratio of the quasi-cyclic block copolymer to polypropylene in S1 is 0%-20%:100%-80%; The quasi-cyclic block copolymer high temperature resistant film produced by the above method comprises a quasi-cyclic block copolymer, polypropylene, a toughening agent and an antioxidant; Wherein, the quasi-cyclic block copolymer is synthesized by block polymerization of at least one polypropylene-based monomer and at least one quasi-cyclic monomer; Wherein, the polypropylene-based monomer is a monomer containing a propylene group, and the quasi-cyclic monomer is a quasi-cyclic structure monomer of a polyolefin; The comprehensive performance test of S3 includes performing a tensile strength test on the film by using a testing device as described in any one of claims 1 to 5.

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