A waterproof polyurethane composite film and its preparation method

Abstract

The present invention provides a waterproof polyurethane composite membrane and a preparation method thereof. The membrane comprises a first non-woven fabric, a first polyurethane coating layer, a second polyurethane coating layer, and a second non-woven fabric. The first polyurethane coating layer is disposed on one side of the first non-woven fabric, the second polyurethane coating layer is disposed on one side of the second non-woven fabric, a decorative layer is disposed on the side of the first non-woven fabric away from the first polyurethane coating layer, and a protective layer is disposed on the side of the second non-woven fabric away from the second polyurethane coating layer. The present invention can improve the waterproof performance and processing quality of the composite membrane, thereby resolving the problems of waterproof membranes prepared by existing processing methods having insufficient waterproofness and being easily damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof membranes, and in particular to a waterproof polyurethane composite membrane and a preparation method thereof. Background Art

[0002] In the design process of existing waterproof packaging bags, in order to achieve a waterproof effect, the packaging bags are usually set to a double-layer polyethylene film structure. The double-layer design structure can prolong the time for water to pass through the membrane, achieving the purpose of waterproofing within a certain period of time. However, it is not applicable to some fields that require long-term waterproofing. For example, in the field of dehumidification bags, dehumidification bags are generally used for at least ten days, so the maintenance time requirements for the waterproof performance of dehumidification bags are very strict. Similarly, the existing waterproof membrane materials are prone to uneven processing quality during the processing process, and the produced waterproof membrane has low tensile strength. It can only guarantee a certain tensile strength in one of the horizontal and vertical directions, and it is easy to be torn when stretched in the other direction. It is easy to cause local damage and leakage in actual applications. It is difficult to improve the strength and quality of waterproof membrane materials using existing processing methods. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a waterproof polyurethane composite membrane and a preparation method thereof, which can improve the waterproof performance and processing quality of the composite membrane, so as to solve the problem that the waterproof membrane prepared by the existing processing method is not waterproof enough and is easily damaged.

[0004] To achieve the above-mentioned object, the present invention is implemented through the following technical solution: a waterproof polyurethane composite membrane, comprising a first non-woven fabric, a first polyurethane coating layer, a second polyurethane coating layer, and a second non-woven fabric, wherein the first polyurethane coating layer is arranged on one side of the first non-woven fabric, the second polyurethane coating layer is arranged on one side of the second non-woven fabric, a decorative layer is provided on the side of the first non-woven fabric away from the first polyurethane coating layer, and a protective layer is provided on the side of the second non-woven fabric away from the second polyurethane coating layer;

[0005] The first polyurethane coating layer is provided with a plurality of mutually parallel first lines along its length direction, and a first spacing is provided between the plurality of first lines. The second polyurethane coating layer is provided with a plurality of mutually parallel second lines along its length direction, and a first spacing is provided between the plurality of second lines. The width of the first line, the width of the second line and the width of the first spacing are all the same, and the thickness of the first line and the thickness of the second line are the same.

[0006] Furthermore, the thickness of the first polyurethane coating layer and the second polyurethane coating layer is 30um-100um.

[0007] Furthermore, the thickness of the first lines and the second lines is 10um-50um, and the width of the first lines, the second lines and the first interval is 0.2mm-0.5mm.

[0008] Furthermore, the decorative layer is printed with a decorative pattern, and the protective layer is printed with a waterproof coating.

[0009] Furthermore, the first non-woven fabric and the second non-woven fabric respectively include a plurality of mutually perpendicular transverse thread bundles and longitudinal thread bundles, the static friction coefficient of the first non-woven fabric is 0.3-0.4, and the static friction coefficient of the second non-woven fabric is 0.1-0.3.

[0010] A method for preparing the waterproof polyurethane composite film, characterized in that a laminating processing system is provided, the laminating processing system comprising a laminating device, a feeding device, an identification device, a pressing device and a receiving device, the laminating device comprising a first laminating mechanism and a second laminating mechanism arranged opposite to each other, the feeding device comprising a first feeding mechanism and a second feeding mechanism, the first feeding mechanism comprising a first discharge port and a second discharge port, the second feeding mechanism comprising a third discharge port and a fourth discharge port, the identification device comprising a first identification mechanism, a second identification mechanism, a third identification mechanism and a fourth identification mechanism, the first identification mechanism comprising a plurality of first ultrasonic sensors, the second identification mechanism comprising a first camera and a plurality of second ultrasonic sensors, the third identification mechanism comprising a plurality of third ultrasonic sensors, the fourth identification mechanism comprising a second camera and a plurality of fourth ultrasonic sensors, the pressing device comprising a steering roller, a first pressing assembly and a second pressing assembly;

[0011] The method comprises:

[0012] Step A, adding the pre-modulated polyurethane slurry into the first laminating mechanism and the second laminating mechanism respectively, setting the heating temperature of the first laminating mechanism and the second laminating mechanism to 80-160° C., and preheating the polyurethane slurry for 10-15 minutes;

[0013] Step B: feeding the first non-woven fabric into the first laminating mechanism through the first feeding mechanism, and feeding the second non-woven fabric into the second laminating mechanism through the second feeding mechanism, setting the feeding speed of the first feeding mechanism and the second feeding mechanism to 20m / min-50m / min;

[0014] Step C includes a laminating step, wherein the laminating step includes setting the discharge speed of the first discharge port of the first laminating mechanism to 30-100g / ㎡, setting the discharge speed of the second discharge port of the first laminating mechanism to 10-50g / ㎡, setting the discharge speed of the third discharge port of the second laminating mechanism to 30-100g / ㎡, setting the discharge speed of the fourth discharge port of the second laminating mechanism to 10-50g / ㎡, controlling the first discharge port, the second discharge port, the third discharge port and the fourth discharge port to operate simultaneously, the first non-woven fabric is laminated through the first discharge port and the second discharge port in turn, a first polyurethane laminating layer is formed on the first non-woven fabric after laminating through the first discharge port, a first texture is formed on the first polyurethane laminating layer after laminating through the second discharge port, the second non-woven fabric is laminated through the third discharge port and the fourth discharge port in turn, a second polyurethane laminating layer is formed on the second non-woven fabric after laminating through the third discharge port, and a second texture is formed on the second polyurethane laminating layer after laminating through the fourth discharge port;

[0015] The step C further includes a coating thickness detection step, which includes controlling a plurality of first ultrasonic sensors in the first identification mechanism to detect the thickness of the coating at the first discharge port, and respectively obtaining a plurality of first coating thicknesses, calculating the plurality of first coating thicknesses using a first algorithm to obtain a first coating thickness difference, and controlling the coating processing system to stop operating when the first coating thickness difference is greater than a preset first threshold value;

[0016] controlling a plurality of third ultrasonic sensors within the third identification mechanism to detect the thickness of the second discharge port after lamination, and obtaining a plurality of second lamination thicknesses respectively, calculating the plurality of second lamination thicknesses using a fourth algorithm to obtain a second lamination thickness difference, and controlling the lamination processing system to stop operating when the second lamination thickness difference is greater than a preset third threshold value;

[0017] The step C further includes a path detection step, which includes a first path contour recognition strategy and a first path thickness recognition strategy. The first path contour recognition strategy includes controlling a first camera in a second recognition mechanism to capture a first image of the second discharge port after lamination at a first interval, and transmitting the first image to a controller for processing. The controller captures a plurality of first contour images of a plurality of first patterns in the first image, defines two sides where the first contour image overlaps with the first image as first short sides, and defines two sides along the length of the first contour image as first long sides. Furthermore, a plurality of first center points equidistantly located at the same distance from the two first long sides are obtained, and a plurality of first widths between the plurality of first center points and the two first long sides are obtained. A first calibration line is obtained by connecting the midpoints of the two first short sides, a plurality of first distances between the plurality of first center points and the first calibration line are obtained, and a first angle between the first calibration line and a side edge of the first non-woven fabric is obtained. The plurality of first widths, the plurality of first distances, and the first angle are calculated using a second algorithm to obtain a first path contour deviation value. When the first path contour deviation value is greater than a preset second threshold value, the lamination processing system is controlled to stop operation.

[0018] The first path thickness identification strategy includes controlling a plurality of second ultrasonic sensors within a second identification mechanism to detect the thicknesses of a plurality of first lines, obtaining a plurality of first path thicknesses of the plurality of first lines, calculating the plurality of first path thicknesses using a third algorithm to obtain a first path thickness deviation value, and controlling the laminating processing system to stop operating when the first path thickness deviation value is greater than a preset third threshold value;

[0019] The path detection step also includes a second path contour recognition strategy and a second path thickness recognition strategy. The second path contour recognition strategy includes controlling a second camera in a fourth recognition mechanism to obtain a second image of the third discharge port after lamination at a first interval, and transmitting the second image to a controller for processing. The controller obtains a plurality of second contour images of a plurality of second patterns in the second image, defines two sides where the second contour image overlaps with the second image as second short sides, and defines two sides in the length direction of the second contour image as second long sides. Then, a plurality of second center points with the same distance as the two second long sides are obtained at equal intervals, and a plurality of second widths between the plurality of second center points and the two second long sides are obtained. The midpoints of the two second short sides are connected to obtain a second calibration line, a plurality of second distances between the plurality of second center points and the second calibration line, and a second angle between the second calibration line and the side edge of the second non-woven fabric are obtained. The plurality of second widths, the plurality of second distances, and the second angle are calculated using a fifth algorithm to obtain a second path contour deviation value. When the second path contour deviation value is greater than a preset fifth threshold value, the lamination processing system is controlled to stop operation.

[0020] The second path thickness identification strategy includes controlling a plurality of fourth ultrasonic sensors within a fourth identification mechanism to detect the thicknesses of a plurality of second lines, obtaining a plurality of second path thicknesses of the plurality of second lines, calculating the plurality of second path thicknesses using a sixth algorithm to obtain a second path thickness deviation value, and controlling the laminating system to stop operating when the second path thickness deviation value is greater than a preset fourth threshold value;

[0021] Step D: passing the coated first non-woven fabric through a first turning roller to turn it so that one side of the coated first non-woven fabric is opposite to the other side of the coated second non-woven fabric, maintaining the same transmission direction of the turned first non-woven fabric and the second non-woven fabric, passing the first non-woven fabric and the second non-woven fabric through a first pressing assembly of a pressing mechanism to form a polyurethane composite film, setting the pressing temperature of the first pressing assembly at 130-160° C., and then passing the pressed polyurethane composite film through a second pressing assembly for shaping, setting the pressing temperature of the second pressing assembly at 5-15° C.;

[0022] Step E: The shaped polyurethane composite film is rolled up by a material receiving device, and the rolling speed of the material receiving device is set to be the same as the feeding speed of the first feeding mechanism and the second feeding mechanism.

[0023] Furthermore, the first algorithm is configured as The fourth algorithm is configured as Among them, Pa1 is the first coating thickness difference, Ha is the first coating thickness, Pb1 is the second coating thickness difference, Hb is the second coating thickness, A1 is the first preset value, A5 is the fifth preset value, and n is the number of first coating thicknesses and second coating thicknesses.

[0024] Furthermore, the second algorithm is configured as Pa2=[(W a1 -A2)+...+(W am -A2)] 2 +[(S a1 -A3)+...+(S am -A3)] 2 +K1(R a1 -R1), the fifth algorithm configuration is Pb2=[(W b1 -A6)+...+(W bm -A6)] 2 +[(S b1 -A7)+...+(S bm -A7)] 2 +K1(R b1-R1), wherein Pa2 is the first path profile deviation value, Wa is the first width, Sa is the first distance, Ra is the first angle, Pb2 is the second path profile deviation value, Wb is the second width, Sb is the second distance, Rb is the second angle, A2 is the second preset value, A3 is the third preset value, A6 is the sixth preset value, A7 is the seventh preset value, A8 is the eighth preset value, R1 is the first preset angle, m is the number of the first center points and the second center points, and K1 is the first preset coefficient.

[0025] Furthermore, the third algorithm is configured as The sixth algorithm is configured as follows: Among them, Pa3 is the first path thickness deviation value, Ia is the first path thickness, Pb3 is the second path thickness deviation value, Ib is the second path thickness, A4 is the fourth preset value, A8 is the eighth preset value, and x is the number of several first path thicknesses and several second path thicknesses.

[0026] Furthermore, the laminating processing system further includes a first adjustment component and a second adjustment component, wherein the first adjustment component is used to drive a plurality of first ultrasonic sensors to perform reciprocating adjustment along the width direction of the first non-woven fabric, and the second adjustment component is used to drive a plurality of third ultrasonic sensors to perform reciprocating adjustment along the width direction of the second non-woven fabric;

[0027] The path detection step further includes controlling the first adjustment component to drive the plurality of first ultrasonic sensors to move back and forth laterally by a first spacing distance at a third time interval;

[0028] The second adjustment component is controlled to drive the plurality of third ultrasonic sensors to move back and forth laterally by a distance of the first spacing at every fourth time interval.

[0029] Furthermore, the coating processing system further includes a prefabricated material mechanism;

[0030] The step A also includes a polyurethane slurry preparation sub-step, which includes adding 60-100 parts of polyurethane and 80-100 parts of solvent in parts by weight to a mixing component of a prefabricated mechanism for mixing, setting a stirring speed of 50-90 r / min and a temperature of 50-80° C., stirring for 10-30 minutes to obtain a first mixture, adding 10-15 parts of a stabilizer and 3-5 parts of a dispersant and continuing to stir for 6-9 minutes to obtain a second mixture, and then sending the second mixture to a drying component of the prefabricated mechanism for drying and dehydration to obtain a polyurethane slurry.

[0031] Furthermore, the stabilizer is set to be one of dimethyl silicone oil or phosphite, and the dispersant is set to be one of triethylhexyl phosphate or sodium lauryl sulfate.

[0032] Beneficial effects of the present invention: The present invention provides a first polyurethane coating layer with a first texture, and a second polyurethane coating layer with a second texture, and during lamination, the first texture and the second texture are alternately laminated, thereby increasing the bonding contact area of the first polyurethane coating layer and the second polyurethane coating layer, and improving the bonding strength of the double-layer film, thereby effectively preventing water from penetrating between the first polyurethane coating layer and the second polyurethane coating layer during waterproofing, and improving the combined waterproofing effect of the first polyurethane coating layer and the second polyurethane coating layer. At the same time, the provision of the first texture and the second texture can increase the transverse bonding strength during lamination, thereby increasing the tensile strength of the first polyurethane coating layer and the second polyurethane coating layer in the transverse and longitudinal directions as a whole, and can further improve the tensile strength of the composite film as a whole when combined with the first non-woven fabric and the second non-woven fabric.

[0033] During the processing of the present invention, by respectively detecting the coating thickness of the first polyurethane coating layer and the second polyurethane coating layer, the problem of uneven coating thickness can be avoided, and the problem of low waterproof effect caused by uneven quality of the produced composite film can be prevented. At the same time, the detection of the thickness and contour of the first and second lines is increased, and the path deviation of the first and second lines and the deviation of the width and thickness of the coating can be detected in time, thereby avoiding the processing of defective products, improving the overall processing quality of the film, and further ensuring the waterproof performance of the waterproof membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0035] Figure 1 This is the process flow diagram of the laminating processing system;

[0036] Figure 2 Schematic diagram of the structure of the polyurethane composite film;

[0037] Figure 3 Schematic diagram of the structure of the first polyurethane coating layer;

[0038] Figure 4 Schematic diagram of the connection between the first polyurethane coating layer and the second polyurethane coating layer.

[0039] In the figure: 1. first non-woven fabric; 11. first polyurethane coating layer; 111. first texture; 2. second non-woven fabric; 21. second polyurethane coating layer; 211. second texture; 31. first coating mechanism; 311. first discharge port; 312. second discharge port; 32. second coating mechanism; 321. third discharge port; 322. fourth discharge port; 41. first identification mechanism; 42. second identification mechanism; 43. third identification mechanism; 44. fourth identification mechanism; 51. first feeding mechanism; 52. second feeding mechanism; 6. pressing device; 61. steering roller; 7. material collecting device. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0041] See also Figure 2-Figure 4 A waterproof polyurethane composite membrane comprises a first non-woven fabric 1, a first polyurethane coating layer 11, a second polyurethane coating layer 21 and a second non-woven fabric 2. The first polyurethane coating layer 11 is arranged on one side of the first non-woven fabric 1, and the second polyurethane coating layer 21 is arranged on one side of the second non-woven fabric 2. A decorative layer is provided on the side of the first non-woven fabric 1 away from the first polyurethane coating layer 11, and a protective layer is provided on the side of the second non-woven fabric 2 away from the second polyurethane coating layer 21.

[0042] The first polyurethane coating layer 11 is provided with a plurality of mutually parallel first lines 111 along its length direction, and a first spacing is provided between the plurality of first lines 111. The second polyurethane coating layer 21 is provided with a plurality of mutually parallel second lines 211 along its length direction, and a first spacing is provided between the plurality of second lines 211. The width of the first lines 111, the width of the second lines 211 and the width of the first spacing are all the same, and the thickness of the first lines 111 and the thickness of the second lines 211 are the same.

[0043] By providing a first texture 111 on one side of the first polyurethane coating layer 11 and a second texture 211 on one side of the second polyurethane coating layer 21, the bonding area of the first polyurethane coating layer 11 and the second polyurethane coating layer 21 can be increased, thereby improving the bonding strength between the two, and integrating the first polyurethane coating layer 11 and the second polyurethane coating layer 21 as much as possible, effectively preventing water from penetrating between the first polyurethane coating layer 11 and the second polyurethane coating layer 21. At the same time, the first texture 111 and the second texture 211 can improve the tensile strength of the first polyurethane coating layer 11 and the second polyurethane coating layer 21, and prevent damage due to external force during application. By respectively coating the first polyurethane coating layer 11 and the second polyurethane coating layer 21 on the first non-woven fabric 1 and the second non-woven fabric 2, the bonding strength between the middle coating layer and the non-woven fabrics on both sides can be improved, and the non-woven fabrics on both sides can further improve the tensile strength.

[0044] The thickness of the first polyurethane coating layer 11 and the second polyurethane coating layer 21 is 30 μm-100 μm.

[0045] Using a polyurethane film with a thickness of 30um-100um can ensure that the film layer is not too thick while ensuring tensile strength and waterproof performance.

[0046] The thickness of the first lines 111 and the second lines 211 is 10 μm-50 μm, and the width of the first lines 111, the second lines 211 and the first interval is 0.2 mm-0.5 mm.

[0047] The use of 10um-50um first lines 111 and second lines 211 can improve the strength of mutual adhesion between the two, and can avoid the appearance of gaps caused by the first lines 111 and second lines 211 being too thick. The setting of the width of the first lines 111 and second lines 211 can further improve the tightness of the fit between the two, and also reduce the difficulty of lamination.

[0048] The decorative layer is printed with decorative patterns, and the protective layer is printed with waterproof coating.

[0049] This design can be better applied to usage scenarios and improve the use effect of the composite membrane.

[0050] The first non-woven fabric 1 and the second non-woven fabric 2 respectively include a plurality of mutually perpendicular transverse thread bundles and longitudinal thread bundles. The static friction coefficient of the first non-woven fabric 1 is 0.3-0.4, and the static friction coefficient of the second non-woven fabric 2 is 0.1-0.3.

[0051] This design can improve the tensile strength of the first non-woven fabric 1 and the second non-woven fabric 2. The first non-woven fabric 1 has a larger static friction coefficient, which can improve the stability of the printed decorative pattern and thus improve the wear resistance of the decorative pattern.

[0052] See also Figures 1-4 A method for preparing a waterproof polyurethane composite film, characterized in that a laminating processing system is provided, the laminating processing system including a laminating device, a feeding device, an identification device, a pressing device 6 and a receiving device 7, the laminating device including a first laminating mechanism 31 and a second laminating mechanism 32 arranged opposite to each other, the feeding device including a first feeding mechanism 51 and a second feeding mechanism 52, the first feeding mechanism 51 including a first discharge port 311 and a second discharge port 312, the second feeding mechanism 52 including a third discharge port 321 and a fourth discharge port 322, the identification device including a first identification mechanism 41, a second identification mechanism 42, a third identification mechanism 43 and a fourth identification mechanism 44, the first identification mechanism 41 including a plurality of first ultrasonic sensors, the second identification mechanism 42 including a first camera and a plurality of second ultrasonic sensors, the third identification mechanism 43 including a plurality of third ultrasonic sensors, the fourth identification mechanism 44 including a second camera and a plurality of fourth ultrasonic sensors, the pressing device 6 including a steering roller 61, a first pressing assembly and a second pressing assembly;

[0053] Methods include:

[0054] Step A: Add the pre-modulated polyurethane slurry into the first laminating mechanism 31 and the second laminating mechanism 32 respectively, set the heating temperature of the first laminating mechanism 31 and the second laminating mechanism 32 to 80-160° C., and preheat the polyurethane slurry for 10-15 minutes;

[0055] Step B: feeding the first non-woven fabric 1 into the first laminating mechanism 31 through the first feeding mechanism 51, and feeding the second non-woven fabric 2 into the second laminating mechanism 32 through the second feeding mechanism 52. The feeding speeds of the first feeding mechanism 51 and the second feeding mechanism 52 are set to 20m / min-50m / min.

[0056] Step C includes a coating step, which includes setting the discharge speed of the first discharge port 311 of the first coating mechanism 31 to 30-100 g / ㎡, setting the discharge speed of the second discharge port 312 of the first coating mechanism 31 to 10-50 g / ㎡, setting the discharge speed of the third discharge port 321 of the second coating mechanism 32 to 30-100 g / ㎡, setting the discharge speed of the fourth discharge port 322 of the second coating mechanism 32 to 10-50 g / ㎡, and controlling the first discharge port 311, the second discharge port 312, the third discharge port 321 and the fourth discharge port 322 to operate simultaneously. The first non-woven fabric 1 is sequentially laminated through the first discharge port 311 and the second discharge port 312. After the first discharge port 311 is laminated, a first polyurethane laminated layer 11 is formed on the first non-woven fabric 1. After the second discharge port 312 is laminated, a first grain 111 is formed on the first polyurethane laminated layer 11. The second non-woven fabric 2 is sequentially laminated through the third discharge port 321 and the fourth discharge port 322. After the third discharge port 321 is laminated, a second polyurethane laminated layer 21 is formed on the second non-woven fabric 2. After the fourth discharge port 322 is laminated, a second grain 211 is formed on the second polyurethane laminated layer 21.

[0057] Step C also includes a coating thickness detection step. The first coating thickness detection step includes controlling a plurality of first ultrasonic sensors within the first identification mechanism 41 to detect the thickness of the first discharge port 311 after coating, and obtaining a plurality of first coating thicknesses respectively. The plurality of first coating thicknesses are calculated using a first algorithm to obtain a first coating thickness difference. When the first coating thickness difference is greater than a preset first threshold value, the coating processing system is controlled to stop operating.

[0058] Controlling the plurality of third ultrasonic sensors within the third identification mechanism 43 to detect the thickness of the second discharge port 312 after coating, and obtaining a plurality of second coating thicknesses respectively, calculating the plurality of second coating thicknesses using a fourth algorithm to obtain a second coating thickness difference, and controlling the coating processing system to stop operating when the second coating thickness difference is greater than a preset third threshold value;

[0059] Step C also includes a path detection step, which includes a first path contour recognition strategy and a first path thickness recognition strategy. The first path contour recognition strategy includes controlling the first camera in the second recognition mechanism 42 to capture a first image of the second discharge port 312 after lamination at a first interval, and transmitting the first image to the controller for processing. The controller obtains a plurality of first contour images of the plurality of first lines 111 in the first image, defines two sides where the first contour image overlaps with the first image as first short sides, and defines two sides in the length direction of the first contour image as first long sides. Then, a plurality of first center points with the same distance as the two first long sides are obtained at equal intervals, and a plurality of first widths between the plurality of first center points and the two first long sides are obtained. The midpoints of the two first short sides are connected to obtain a first calibration line, a plurality of first distances between the plurality of first center points and the first calibration line, and a first angle between the first calibration line and the side edge of the first non-woven fabric 1 are obtained. The plurality of first widths, the plurality of first distances, and the first angle are calculated using a second algorithm to obtain a first path contour deviation value. When the first path contour deviation value is greater than a preset second threshold value, the lamination processing system is controlled to stop operation.

[0060] The first path thickness recognition strategy includes controlling the plurality of second ultrasonic sensors within the second recognition mechanism 42 to detect the thickness of the plurality of first lines 111, obtaining the plurality of first path thicknesses of the plurality of first lines 111, calculating the plurality of first path thicknesses using a third algorithm to obtain a first path thickness deviation value, and controlling the laminating system to stop operating when the first path thickness deviation value is greater than a preset third threshold value;

[0061] The path detection step also includes a second path contour recognition strategy and a second path thickness recognition strategy. The second path contour recognition strategy includes controlling the second camera in the fourth recognition mechanism 44 to obtain a second image of the third discharge port 321 after lamination at a first interval, and transmitting the second image to the controller for processing. The controller obtains a plurality of second contour images of the plurality of second lines 211 in the second image, defines two sides where the second contour image overlaps with the second image as second short sides, and defines two sides in the length direction of the second contour image as second long sides. Then, a plurality of second center points with the same distance as the two second long sides are obtained at equal intervals, and a plurality of second widths between the plurality of second center points and the two second long sides are obtained. The midpoints of the two second short sides are connected to obtain a second calibration line, a plurality of second distances between the plurality of second center points and the second calibration line, and a second angle between the second calibration line and the side edge of the second non-woven fabric 2 are obtained. The plurality of second widths, the plurality of second distances, and the second angle are calculated using a fifth algorithm to obtain a second path contour deviation value. When the second path contour deviation value is greater than a preset fifth threshold value, the lamination processing system is controlled to stop operation.

[0062] The second path thickness recognition strategy includes controlling the plurality of fourth ultrasonic sensors within the fourth recognition mechanism 44 to detect the thickness of the plurality of second lines 211, obtaining the plurality of second path thicknesses of the plurality of second lines 211, calculating the plurality of second path thicknesses using a sixth algorithm to obtain a second path thickness deviation value, and controlling the laminating system to stop operating when the second path thickness deviation value is greater than a preset fourth threshold value;

[0063] Step D: The first non-woven fabric 1 after lamination is deflected by the first deflection roller 61 so that the laminating side of the first non-woven fabric 1 is opposite to the laminating side of the second non-woven fabric 2, and the transport directions of the deflected first non-woven fabric 1 and the second non-woven fabric 2 are kept the same. The first non-woven fabric 1 and the second non-woven fabric 2 are passed through the first laminating assembly of the laminating mechanism to form a polyurethane composite film, and the laminating temperature of the first laminating assembly is set at 130-160° C. The laminated polyurethane composite film is then passed through the second laminating assembly for shaping, and the laminating temperature of the second laminating assembly is set at 5-15° C.

[0064] In step E, the shaped polyurethane composite film is rolled up by the material receiving device 7 , and the rolling speed of the material receiving device 7 is set to be the same as the feeding speed of the first feeding mechanism 51 and the second feeding mechanism 52 .

[0065] Through the above steps, the problem of uneven thickness of the first polyurethane coating layer 11 and the second polyurethane coating layer 21 can be detected in time during coating. By timely stopping the machine for maintenance, defective products can be avoided during the processing process, thereby ensuring the production quality of the product. At the same time, by detecting the paths of the first lines 111 and the second lines 211, the problems of path deviation, uneven width and thickness of the first lines 111 and the second lines 211 during coating can be discovered in time, further ensuring the quality of coating, thereby ensuring the processing quality of the composite film.

[0066] The first algorithm is configured as The fourth algorithm is configured as Among them, Pa1 is the first coating thickness difference, Ha is the first coating thickness, Pb1 is the second coating thickness difference, Hb is the second coating thickness, A1 is the first preset value, A5 is the fifth preset value, and n is the number of first coating thicknesses and second coating thicknesses.

[0067] Through the first algorithm and the fourth algorithm, the thickness deviation of the first polyurethane coating layer 11 and the second polyurethane coating layer 21 during coating can be accurately obtained, thereby improving the timeliness of the coating thickness detection of the first polyurethane coating layer 11 and the second polyurethane coating layer 21. In the first algorithm, the differences between the obtained several first coating thicknesses and the first preset value are calculated, and the corresponding differences are squared respectively to avoid the influence of positive and negative values. The squared values are added and then squared, and the difference fluctuations between the several first coating thicknesses and the first preset value can be obtained. The first preset value is the thickness value that the first coating thickness should theoretically have. Similarly, the fourth algorithm can calculate the difference fluctuations between the several second coating thicknesses and the fifth preset value. The fifth preset value is the thickness value that the second coating thickness should theoretically have.

[0068] The second algorithm is configured as Pa2=[(W a1 -A2)+...+(W am -A2)] 2 +[(S a1 -A3)+...+(S am -A3)] 2 +K1(R a1 -R1), the fifth algorithm configuration is Pb2=[(W b1 -A6)+...+(W bm -A6)] 2 +[(S b1 -A7)+...+(S bm -A7)] 2 +K1(R b1 -R1), wherein Pa2 is the first path profile deviation value, Wa is the first width, Sa is the first distance, Ra is the first angle, Pb2 is the second path profile deviation value, Wb is the second width, Sb is the second distance, Rb is the second angle, A2 is the second preset value, A3 is the third preset value, A6 is the sixth preset value, A7 is the seventh preset value, A8 is the eighth preset value, R1 is the first preset angle, m is the number of the first center points and the second center points, and K1 is the first preset coefficient.

[0069] The second algorithm and the fifth algorithm can be used to calculate whether there is a deviation in the lamination path of the first pattern 111 and the second pattern 211, thereby improving the timeliness of the detection of the lamination path of the first pattern 111 and the second pattern 211. In the second algorithm, the difference fluctuations between several first widths and the second preset values and the difference fluctuations between several first distances and the third preset values are calculated respectively, and then the difference between the first angle and the first preset angle is calculated and assigned a first preset coefficient for conversion. By performing difference calculation on these three parameters and then adding them together, the difference between the three parameters obtained and the preset values can be obtained, and the calculated value can be used to analyze the deviation of the first path profile. Similarly, the value calculated by the fifth algorithm can be used to analyze the deviation of the second path profile.

[0070] The third algorithm is configured as The sixth algorithm is configured as Among them, Pa3 is the first path thickness deviation value, Ia is the first path thickness, Pb3 is the second path thickness deviation value, Ib is the second path thickness, A4 is the fourth preset value, A8 is the eighth preset value, and x is the number of several first path thicknesses and several second path thicknesses.

[0071] The third and sixth algorithms can calculate the thickness of the first and second lines 111, 211 after coating, enabling timely detection of the coating thickness of the first and second lines 111, 211. These algorithms can improve monitoring of the overall coating quality, thereby ensuring the quality of the composite film coating process. The third algorithm calculates the difference between the thickness of several first paths and a fourth preset value to determine the thickness difference at different locations on the first path. Similarly, the sixth algorithm can calculate the deviation in the thickness of the second path.

[0072] The laminating processing system also includes a first adjustment component and a second adjustment component. The first adjustment component is used to drive a plurality of first ultrasonic sensors to reciprocate along the width direction of the first non-woven fabric 1, and the second adjustment component is used to drive a plurality of third ultrasonic sensors to reciprocate along the width direction of the second non-woven fabric 2.

[0073] The path detection step further includes controlling the first adjustment component to drive the plurality of first ultrasonic sensors to move back and forth laterally by a first spacing distance at a third time interval;

[0074] The second adjustment component is controlled to drive the plurality of third ultrasonic sensors to move back and forth laterally by a distance of the first spacing at every fourth time interval.

[0075] By changing the lateral positions of several first ultrasonic sensors and several second ultrasonic sensors within a specific time, the lamination areas of the first discharge port 311 and the third discharge port 321 in the lamination width direction can be comprehensively detected, avoiding the problem of missing detection areas.

[0076] The coating processing system also includes a prefabricated material mechanism;

[0077] Step A also includes a polyurethane slurry preparation sub-step, which includes adding 60-100 parts of polyurethane and 80-100 parts of solvent in parts by weight to the mixing component of the prefabricated mechanism for mixing, setting the stirring speed to 50-90r / min and the temperature to 50-80°C, stirring for 10-30min to obtain a first mixture, adding 10-15 parts of a stabilizer and 3-5 parts of a dispersant and continuing to stir for 6-9min to obtain a second mixture, and then sending the second mixture to the drying component of the prefabricated mechanism for drying and dehydration to obtain polyurethane slurry.

[0078] This design can obtain the polyurethane slurry required for lamination by drying the stirred mixture after mixing. The quality of the prepared polyurethane slurry can be improved through the polyurethane slurry preparation sub-step.

[0079] The stabilizer is set to be one of dimethyl silicone oil or phosphite, and the dispersant is set to be one of triethylhexyl phosphate or sodium lauryl sulfate.

[0080] Adding a stabilizer can slow down the reaction, maintain chemical equilibrium, reduce surface tension, and prevent light, heat, or oxidative decomposition, thereby improving the sustained performance of the polyurethane coating layer. Adding a dispersant can evenly disperse inorganic substances that are difficult to dissolve in liquids, while also preventing particle sedimentation and agglomeration, thereby improving the uniformity of the mixture and helping to improve the waterproof performance of the polyurethane coating layer.

[0081] Working principle: In the process of processing the polyurethane composite film, the processing is carried out in sequence according to step A, step B, step C, step D and step E in the preparation method. The first polyurethane coating layer 11 and the second polyurethane coating layer 21 can be respectively coated on the adjacent two sides of the first non-woven fabric 1 and the second non-woven fabric 2, and the first and second polyurethane coating layers 111 and 211 are respectively coated on the two sides where the first polyurethane coating layer 11 and the second polyurethane coating layer 21 are bonded. By staggered pressing of the first and second coating layers 111 and 211, the bonding strength and tensile strength of the polyurethane composite film can be improved.

[0082] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for preparing a waterproof polyurethane composite film, characterized in that: A laminating processing system is provided, the laminating processing system comprising a laminating device, a feeding device, an identification device, a pressing device (6) and a receiving device (7), the laminating device comprising a first laminating mechanism (31) and a second laminating mechanism (32) arranged opposite to each other, the feeding device comprising a first feeding mechanism (51) and a second feeding mechanism (52), the first feeding mechanism (51) comprising a first discharge port (311) and a second discharge port (312), the second feeding mechanism (52) comprising a third discharge port (321) and a fourth discharge port (322), the identification device The device comprises a first recognition mechanism (41), a second recognition mechanism (42), a third recognition mechanism (43) and a fourth recognition mechanism (44); the first recognition mechanism (41) comprises a plurality of first ultrasonic sensors; the second recognition mechanism (42) comprises a first camera and a plurality of second ultrasonic sensors; the third recognition mechanism (43) comprises a plurality of third ultrasonic sensors; the fourth recognition mechanism (44) comprises a second camera and a plurality of fourth ultrasonic sensors; the laminating device (6) comprises a steering roller (61), a first laminating assembly and a second laminating assembly; The preparation method comprises: Step A, adding the pre-modulated polyurethane slurry into the first laminating mechanism (31) and the second laminating mechanism (32), respectively, setting the heating temperature of the first laminating mechanism (31) and the second laminating mechanism (32) to 80-160° C., and preheating the polyurethane slurry for 10-15 minutes; Step B, feeding the first non-woven fabric (1) into the first laminating mechanism (31) through the first feeding mechanism (51), and feeding the second non-woven fabric (2) into the second laminating mechanism (32) through the second feeding mechanism (52), and setting the feeding speed of the first feeding mechanism (51) and the second feeding mechanism (52) to 20m / min-50m / min; Characterized in that, the preparation method further comprises: Step C, wherein step C includes a coating step, wherein the coating step includes setting the discharge speed of the first discharge port (311) of the first coating mechanism (31) to 30-100 g / m2, setting the discharge speed of the second discharge port (312) of the first coating mechanism (31) to 10-50 g / m2, setting the discharge speed of the third discharge port (321) of the second coating mechanism (32) to 30-100 g / m2, setting the discharge speed of the fourth discharge port (322) of the second coating mechanism (32) to 10-50 g / m2, controlling the first discharge port (311), the second discharge port (312), the third discharge port (321) and the fourth discharge port (322) to operate simultaneously, and the first non-woven fabric The cloth (1) is sequentially coated through a first discharge port (311) and a second discharge port (312); after coating through the first discharge port (311), a first polyurethane coating layer (11) is formed on the first non-woven fabric (1); after coating through the second discharge port (312), a first grain (111) is formed on the first polyurethane coating layer (11); the second non-woven fabric (2) is sequentially coated through a third discharge port (321) and a fourth discharge port (322); after coating through the third discharge port (321), a second polyurethane coating layer (21) is formed on the second non-woven fabric (2); after coating through the fourth discharge port (322), a second grain (211) is formed on the second polyurethane coating layer (21); The step C also includes a path detection step, the path detection step includes a first path contour recognition strategy and a first path thickness recognition strategy, the first path contour recognition strategy includes controlling a first camera in a second recognition mechanism (42) to obtain a first image of the second discharge port (312) after coating at a first interval, and transmitting the first image to a controller for processing, the controller obtaining a plurality of first contour images of a plurality of first lines (111) in the first image, defining two sides where the first contour image overlaps with the first image as first short sides, and defining two sides in the length direction of the first contour image as a first long side, then obtaining a number of first center points at the same distance from the two first long sides, and obtaining a number of first widths between the first center points and the two first long sides, connecting the midpoints of the two first short sides to obtain a first calibration line, obtaining a number of first distances between the first center points and the first calibration line, and obtaining a first angle between the first calibration line and the side of the first non-woven fabric (1), calculating the first widths, the first distances, and the first angle using a second algorithm to obtain a first path profile deviation value, and when the first path profile deviation value is greater than a preset second threshold value, controlling the laminating processing system to stop operating; The path detection step also includes a second path contour recognition strategy and a second path thickness recognition strategy, wherein the second path contour recognition strategy includes controlling the second camera in the fourth recognition mechanism (44) to obtain a second image of the third discharge port (321) after lamination at a first interval, and transmitting the second image to the controller for processing, wherein the controller obtains a plurality of second contour images of a plurality of second lines (211) in the second image, defines two sides where the second contour image overlaps with the second image as second short sides, and defines two sides in the length direction of the second contour image as second long sides, then obtains a plurality of second center points at the same distance as the two second long sides, obtains a plurality of second widths between the plurality of second center points and the two second long sides, connects the midpoints of the two second short sides to obtain a second calibration line, obtains a plurality of second distances between the plurality of second center points and the second calibration line, and obtains a second angle between the second calibration line and the side of the second non-woven fabric (2), calculates the plurality of second widths, the plurality of second distances and the second angle by a fifth algorithm to obtain a second path contour deviation value, and controls the lamination processing system to stop operating when the second path contour deviation value is greater than a preset fifth threshold value; Step D, passing the coated first non-woven fabric (1) through a first turning roller (61) to turn the coated side of the first non-woven fabric (1) to face the coated side of the second non-woven fabric (2), keeping the transmission directions of the turned first non-woven fabric (1) and the second non-woven fabric (2) the same, passing the first non-woven fabric (1) and the second non-woven fabric (2) through a first pressing assembly of a pressing mechanism to form a polyurethane composite film, setting the pressing temperature of the first pressing assembly at 130-160° C., and then passing the pressed polyurethane composite film through a second pressing assembly for shaping, setting the pressing temperature of the second pressing assembly at 5-15° C.; Step E, winding the shaped polyurethane composite film through a receiving device (7), and setting the winding speed of the receiving device (7) to be the same as the feeding speed of the first feeding mechanism (51) and the second feeding mechanism (52); The second algorithm is configured as Pa2=[(W a1 -A2)+...+(W am -A2)] 2 +[(S a1 -A3)+...+(S am -A3)] 2 +K1(R a1 -R1), the fifth algorithm configuration is Pb2=[(W b1 -A6)+...+(W bm -A6)] 2 +[(S b1 -A7)+...+(S bm -A7)] 2 +K1(R b1 -R1), wherein Pa2 is the first path profile deviation value, Wa is the first width, Sa is the first distance, Ra is the first angle, Pb2 is the second path profile deviation value, Wb is the second width, Sb is the second distance, Rb is the second angle, A2 is the second preset value, A3 is the third preset value, A6 is the sixth preset value, A7 is the seventh preset value, A8 is the eighth preset value, R1 is the first preset angle, m is the number of the first center points and the second center points, and K1 is the first preset coefficient.

2. The preparation method according to claim 1, characterized in that Said step C also includes a coating thickness detection step, wherein said first coating thickness detection step includes controlling a plurality of first ultrasonic sensors in a first identification mechanism (41) to detect the thickness of the first discharge port (311) after coating, and obtaining a plurality of first coating thicknesses respectively, calculating the plurality of first coating thicknesses by a first algorithm to obtain a first coating thickness difference, and when the first coating thickness difference is greater than a preset first threshold value, controlling the coating processing system to stop operating; Controlling a plurality of third ultrasonic sensors in the third identification mechanism (43) to detect the thickness of the second discharge port (312) after coating, and respectively obtaining a plurality of second coating thicknesses, calculating the plurality of second coating thicknesses using a fourth algorithm to obtain a second coating thickness difference, and controlling the coating processing system to stop operating when the second coating thickness difference is greater than a preset third threshold value; The first path thickness recognition strategy includes controlling a plurality of second ultrasonic sensors in a second recognition mechanism (42) to detect the thickness of a plurality of first lines (111), obtaining a plurality of first path thicknesses of the plurality of first lines (111), calculating the plurality of first path thicknesses using a third algorithm to obtain a first path thickness deviation value, and controlling the laminating processing system to stop operating when the first path thickness deviation value is greater than a preset third threshold value; The second path thickness identification strategy includes controlling a plurality of fourth ultrasonic sensors in a fourth identification mechanism (44) to detect the thickness of a plurality of second lines (211), obtaining a plurality of second path thicknesses of the plurality of second lines (211), calculating the plurality of second path thicknesses through a sixth algorithm to obtain a second path thickness deviation value, and controlling the laminating processing system to stop operating when the second path thickness deviation value is greater than a preset fourth threshold value.

3. The preparation method according to claim 2, characterized in that The first algorithm is configured as The fourth algorithm is configured as Among them, Pa1 is the first coating thickness difference, Ha is the first coating thickness, Pb1 is the second coating thickness difference, Hb is the second coating thickness, A1 is the first preset value, A5 is the fifth preset value, and n is the number of first coating thicknesses and second coating thicknesses.

4. The preparation method according to claim 2, characterized in that The third algorithm is configured as The sixth algorithm is configured as follows: Among them, Pa3 is the first path thickness deviation value, Ia is the first path thickness, Pb3 is the second path thickness deviation value, Ib is the second path thickness, A4 is the fourth preset value, A8 is the eighth preset value, and x is the number of several first path thicknesses and several second path thicknesses.

5. The method according to claim 1, wherein The laminating processing system further includes a first adjusting component and a second adjusting component, wherein the first adjusting component is used to drive a plurality of first ultrasonic sensors to perform reciprocating adjustment along the width direction of the first non-woven fabric (1), and the second adjusting component is used to drive a plurality of third ultrasonic sensors to perform reciprocating adjustment along the width direction of the second non-woven fabric (2); The path detection step further includes controlling the first adjustment component to drive the plurality of first ultrasonic sensors to move back and forth laterally by a first spacing distance at a third time interval; The second adjustment component is controlled to drive the plurality of third ultrasonic sensors to move back and forth laterally by a distance of the first spacing at every fourth time interval.

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