A preparation method of a novel durable polyurethane water-based coating fabric

Abstract

The invention discloses a method for preparing a novel durable polyurethane water-based coating fabric, wherein water-based polyurethane modified by (2-hydroxyethyl) triphenylphosphine chloride, a flame retardant, a dispersant, a wetting agent, a high concentration of carbodiimide crosslinking agent, etc. are mixed to obtain a water-based coating slurry; the water-based coating slurry is applied to the surface of a fabric substrate, and a water-based coating is formed on the surface of the fabric substrate after drying. The invention develops a water-based coating formula mainly based on water-based polyurethane modified by (2-hydroxyethyl) triphenylphosphine chloride and a high concentration of carbodiimide crosslinking agent, replacing the traditional oil-based coating formula using toluene, butanone, etc. as solvents, overcoming the problems of poor fastness and poor adhesion of the existing water-based coating body; and the water-based coating is applied to the surface of the fabric by mechanical coating to form a special coating film, which greatly improves the adhesion, wear resistance and durability of the water-based coating.

Description

Technical Field

[0001] The invention belongs to the field of coating preparation, and specifically relates to a preparation method of a novel durable polyurethane water-based coating fabric. Background Art

[0002] Coated fabric is a functional textile fabric with a special coating on the surface of fabric or non-woven fabric, which is in the finishing stage of textile fabric. That is, using organic solvents or water to dissolve the coating particles into a fluid state, forming a special coating film on the surface of the fabric body, giving it special functions such as water resistance, flame retardancy, wear resistance, antibacterial, and UV resistance.

[0003] At present, there are two types of coated fabrics on the market. Oily coated fabrics use oily materials such as toluene methyl ketone as solvents, accounting for about 80% of the market. They are very environmentally unfriendly and easily release volatile organic compounds, which are harmful to the human body and the environment. Water-based coated fabrics use water as a solvent, but due to high cost and immature technology, they have not yet been popularized. The water-based coatings developed in the existing technology have problems such as poor body fastness, poor adhesion, poor shielding, and easy penetration of water-based coatings into fibers, which seriously restricts the application of water-based coatings in the textile industry. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a novel durable polyurethane water-based coating fabric. In view of the defects in the prior art, a water-based coating formula mainly based on water-based polyurethane modified by (2-hydroxyethyl) triphenylphosphine chloride and a high-concentration carbodiimide crosslinking agent is developed to replace the traditional oil-based coating formula using toluene, butanone and the like as solvents, thereby overcoming the problems of poor body fastness and poor adhesion of the existing water-based coating; and the water-based coating is applied to the surface of the fabric by mechanical coating to form a special coating film, thereby greatly improving the adhesion, wear resistance and durability of the water-based coating.

[0005] In order to solve the above technical problems, the following technical solutions are adopted:

[0006] A method for preparing a novel durable polyurethane water-based coating fabric, characterized by comprising the following steps:

[0007] Mix 90-110 parts of (2-hydroxyethyl) triphenylphosphine chloride modified waterborne polyurethane, 75-90 parts of flame retardant, 0.1-0.5 parts of dispersant, 0.1-0.5 parts of wetting agent, 8-12 parts of high concentration carbodiimide crosslinking agent, 1-3 parts of brightener, 14-18 parts of titanium dioxide, and 0.1-0.5 parts of defoamer to obtain a waterborne coating slurry;

[0008] The aqueous coating slurry is applied to the surface of the fabric substrate and dried at 90-120° C. After being completely dried, an aqueous coating is formed on the surface of the fabric substrate.

[0009] Preferably, the flame retardant is one or more combinations of magnesium hydroxide, aluminum hydroxide, and nano-layered silicate.

[0010] Preferably, the dispersant is one or more of sodium dodecylbenzene sulfonate, polymethacrylic acid, lauryl alcohol ether phosphate, sodium citrate, polyvinylpyrrolidone, and fatty alcohol polyoxyethylene ether.

[0011] Preferably, the wetting agent is one of polyether-modified silicone, modified polysiloxane or organosiloxane copolymer.

[0012] After optimization, the defoamer is one of defoamer 204, silicone defoamer PLX-4060 or polyurethane defoamer DE-0389; the brightener is one of stilbene type, pyrazoline type and phthalimide type.

[0013] After optimization, a mechanical coating device is used to coat the water-based coating slurry on the surface of the fabric substrate. The mechanical coating device includes a body and a cloth feeding mechanism, a coating mechanism and a feeding mechanism installed on the body. The cloth feeding mechanism is used to transport the fabric and give the fabric tension to put it in a tensioned state. The coating mechanism is used to cooperate with the cloth feeding mechanism to coat the water-based coating slurry on the surface of the fabric being transported. The feeding mechanism is used to provide the water-based coating slurry to the coating mechanism.

[0014] Preferably, the coating mechanism includes a first coating component on the left and a second coating component on the right, and the fabric passes between the first coating component and the second coating component, and the two cooperate with each other to coat the water-based coating slurry on both sides of the fabric; the first coating component includes a first telescopic cylinder, a first bracket and a first coating plate, the first telescopic cylinder is connected to and controls the telescopic movement of the first bracket, the first bracket is used to install the first coating plate, the two sides of the first coating plate are enclosed by the first bracket, and the first coating plate is tilted, during the coating process, the water-based coating slurry accumulates on the first coating plate; the second coating component includes a second telescopic cylinder, a second bracket and a second coating plate, the second telescopic cylinder is connected to and controls the telescopic movement of the second bracket, the second bracket is used to install the second coating plate, the two sides of the second coating plate are enclosed by the second bracket, and the second coating plate is tilted, during the coating process, the water-based coating slurry accumulates on the second coating plate.

[0015] Preferably, during the coating process, the first bracket and the second bracket are assembled with each other to enclose the first coating plate and the second coating plate; a first adjustment plate is detachably provided at the assembly point of the first bracket, and a second adjustment plate is detachably provided at the assembly point of the second bracket, and the first adjustment plate is provided with a contact sensor, and the first telescopic cylinder and the second telescopic cylinder are controlled by the contact sensor; the first adjustment plate includes different widths, and the second adjustment plate includes different widths. By replacing the first adjustment plate and the second adjustment plate of different widths, the distance between the first coating plate and the second coating plate is adjusted, thereby adjusting the distance between the first coating plate and the fabric and the distance between the second coating plate and the fabric.

[0016] Preferably, the first coating component also includes a first slurry recoverer, which includes a first material receiving box and a first recovery tube. The first material receiving box is connected to the first bracket and is provided with a first drainage nozzle. The first drainage nozzle is arranged below the first coating plate for receiving the leaked aqueous coating slurry and draining it into the first material receiving box. The first recovery tube is detachably installed at the lower end of the first material receiving box. The aqueous coating slurry flows from the first material receiving box into the first recovery tube. The first recovery tube collects the leaked aqueous coating slurry and reuses it; the second coating component also includes a second slurry recoverer, which includes a second material receiving box and a second recovery tube. The second material receiving box is connected to the second bracket and is provided with a second drainage nozzle. The second drainage nozzle is arranged below the second coating plate for receiving the leaked aqueous coating slurry and draining it into the second material receiving box. The second recovery tube is detachably installed at the lower end of the second material receiving box. The aqueous coating slurry flows from the second material receiving box into the second recovery tube. The second recovery tube collects the leaked aqueous coating slurry and reuses it.

[0017] After optimization, the feeding mechanism is arranged on both sides of the left and right sides of the machine body, corresponding to the first coating component and the second coating component respectively, and installed above the first coating component and the second coating component. The feeding mechanism includes a mounting frame and a slurry box connected to the mounting frame. The slurry box is used to store water-based coating slurry and provide water-based coating slurry to the first coating plate and the second coating plate; an automatic switch is installed at the bottom opening of the feeding mechanism, and the automatic switch includes a switch cylinder and a cover. The switch cylinder is connected to and controls the movement of the cover, and the cover is used to block or open the bottom opening; an infrared receiver is provided at the lower end of the cover, and an infrared transmitter is provided on the first coating plate and the second coating plate. The infrared transmitter and the infrared receiver match each other, and the automatic switch is controlled to open or close the feeding with the help of the infrared receiver and the infrared transmitter.

[0018] Preferably, the cloth feeding mechanism includes a cloth feed roller, an upper guide roller, a lower guide roller, a tension roller and a cloth outlet roller. The upper guide roller and the lower guide roller are used to adjust the top-to-bottom conveying direction and conveying position of the fabric so that it passes between the first coating component and the second coating component; the tension roller is connected to a lifting cylinder, and the height position of the tension roller is adjusted by the lifting cylinder, thereby adjusting the tension of the fabric.

[0019] The above technical solution has the following beneficial effects:

[0020] The present invention develops a water-based coating formula mainly composed of (2-hydroxyethyl) triphenylphosphine chloride modified water-based polyurethane and a high-concentration carbodiimide cross-linking agent, which replaces the traditional oil-based coating formula using toluene, butanone, etc. as solvents, overcomes the problems of poor body fastness and poor adhesion of existing water-based coatings, fills the gap in the market of water-based coating composite materials that take into account functionality, environmental protection, and weather resistance, and is suitable for the fields of field tents, outdoor equipment, airbags, etc.

[0021] The present invention adopts a mechanical coating method to apply the water-based coating on the surface of the fabric to form a special coating film, which greatly improves the adhesion, wear resistance and durability of the water-based coating. In addition, the mechanical coating method can continuously coat the fabric, greatly improve production efficiency and improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings:

[0023] Figure 1 is a schematic diagram of a mechanical coating device;

[0024] Figure 2 It is a schematic diagram of the internal structure of the mechanical coating device;

[0025] Figure 3 It is a structural schematic diagram of the feeding mechanism;

[0026] Figure 4 It is a structural diagram of an automatic switch;

[0027] Figure 5 is a schematic structural diagram of a first coating assembly;

[0028] Figure 6 is a schematic structural diagram of a second coating assembly;

[0029] Figure 7 It is a schematic diagram of the structure of the first slurry recovery device.

[0030] The accompanying drawings are marked as follows: body 1, cloth inlet 11, cloth outlet 12, door 13, cloth inlet roller 21, upper guide roller 22, lower guide roller 23, tension roller 24, cloth outlet roller 25, lifting cylinder 241, feeding mechanism 3, mounting frame 31, mounting frame 31, slurry box 32, automatic switch 33, switch cylinder 331, sealing cover 332, first coating component 4, first telescopic cylinder 41, first bracket 42, first coating plate 43, infrared emitter 431, first slurry recoverer 44, first material receiving box 441, first recovery cylinder 442, first drainage nozzle 443, first adjustment plate 45, contact sensor 451, second coating component 5, second telescopic cylinder 51, second bracket 52, second coating plate 53, second slurry recoverer 54, second adjustment plate 55, pre-drying mechanism 6. DETAILED DESCRIPTION

[0031] The present invention aims at a preparation method of a novel durable polyurethane water-based coating fabric. A water-based coating formula mainly based on water-based polyurethane modified by (2-hydroxyethyl) triphenylphosphine chloride and a high-concentration carbodiimide cross-linking agent is developed to replace the traditional oil-based coating formula with toluene, butanone and the like as solvents, thereby overcoming the problems of poor body fastness and poor adhesion of the existing water-based coating. The water-based coating is applied to the surface of the fabric by mechanical coating to form a special coating film, thereby greatly improving the adhesion, wear resistance and durability of the water-based coating.

[0032] The technical solution of the present invention is described in detail below in conjunction with specific embodiments:

[0033] Example 1

[0034] 110 parts of (2-hydroxyethyl) triphenylphosphine chloride modified waterborne polyurethane, 80 parts of magnesium hydroxide, 0.5 parts of sodium dodecylbenzene sulfonate, 0.5 parts of polyether modified silicone, 12 parts of high concentration carbodiimide crosslinking agent, 3 parts of distyrene type brightener, 18 parts of titanium dioxide, and 0.5 parts of silicone defoamer PLX-4060 are mixed to obtain a waterborne coating slurry; the waterborne coating slurry is applied to the surface of a fabric substrate and dried at 120° C. After being completely dried, a waterborne coating is formed on the surface of the fabric substrate.

[0035] The fabric has been tested to have a color fastness to sunlight of 8, a UPF (ultraviolet protection factor) value of 60, and a temperature resistance range of -50°C to 90°C.

[0036] Example 2

[0037] 110 parts of (2-hydroxyethyl) triphenylphosphine chloride modified waterborne polyurethane, 90 parts of magnesium hydroxide, 0.5 parts of sodium dodecylbenzene sulfonate, 0.1 parts of polyether modified silicone, 8 parts of high concentration carbodiimide crosslinking agent, 1 part of pyrazoline type brightener, 14 parts of titanium dioxide, and 0.5 parts of defoamer 204 are mixed to obtain a waterborne coating slurry; the waterborne coating slurry is applied to the surface of a fabric substrate and dried at 120° C. After being completely dried, a waterborne coating is formed on the surface of the fabric substrate.

[0038] The fabric has been tested to have a color fastness to sunlight of 7, a UPF (ultraviolet protection factor) value of 50, and a temperature resistance range of -50°C to 90°C.

[0039] Example 3

[0040] 100 parts of (2-hydroxyethyl) triphenylphosphine chloride modified waterborne polyurethane, 90 parts of nano-layered silicate, 0.5 parts of polymethacrylic acid, 0.5 parts of modified polysiloxane, 12 parts of high-concentration carbodiimide crosslinking agent, 2 parts of pyrazoline-type brightener, 17 parts of titanium dioxide, and 0.5 parts of silicone defoamer PLX-4060 are mixed to obtain a waterborne coating slurry; the waterborne coating slurry is applied to the surface of a fabric substrate and dried at 120° C. After being completely dried, a waterborne coating is formed on the surface of the fabric substrate.

[0041] The fabric has been tested to have a color fastness to sunlight of 8, a UPF (ultraviolet protection factor) value of 50, and a temperature resistance range of -50°C to 90°C.

[0042] In Examples 1 to 3, a mechanical coating device is used to coat the water-based coating slurry on the surface of the fabric substrate. The mechanical coating device includes a body 1 and a cloth feeding mechanism, a coating mechanism and a feeding mechanism 3 installed on the body 1. The surface of the body 1 is provided with a cloth inlet 11, a cloth outlet 12 and a door 13. The fabric enters the body 1 from the cloth inlet 11, is transported by the cloth feeding mechanism, and is sent out from the cloth outlet 12. The door 13 can be opened or closed to facilitate operation by the staff.

[0043] like Figure 2As shown, the cloth feeding mechanism is used to convey the fabric and give the fabric tension to make it in a tensioned state; the cloth feeding mechanism includes a cloth feeding roller 21, an upper guide roller 22, a lower guide roller 23, a tension roller 24 and a cloth discharging roller 25. The cloth feeding roller 21 is located near the cloth inlet 11 above. After the fabric enters the cloth inlet 11, it is conveyed to the upper guide roller 22 through the cloth feeding roller 21. The upper guide roller 22 is provided with two rollers arranged side by side, and a gap is formed in the middle for conveying the fabric downward, and the fabric is ensured to be in the middle position of the machine body 1. During the downward conveying process of the fabric, the coating mechanism sequentially coats the water-based coating slurry on the surface of the fabric; after coating, the fabric is further conveyed downward to the lower guide roller 23. The lower guide roller 23 is provided with two rollers arranged side by side, and a gap is formed in the middle for conveying the fabric to the tension roller 24. The tension roller 24 is connected to a lifting cylinder 241. The height of the tension roller 24 can be adjusted by the lifting cylinder 241, and then the tension of the fabric is adjusted, so that the fabric is conveyed in a tensioned state, which is beneficial to improving the coating effect of the coating mechanism. At the same time, the height-adjustable feature of the tension roller 24 also facilitates the initial installation of the fabric through the mechanical coating device.

[0044] The coating mechanism includes a first coating assembly 4 disposed on the left side of the machine body 1 and a second coating assembly 5 disposed on the right side of the machine body 1. The fabric is conveyed downward from between the first coating assembly 4 and the second coating assembly 5. During the conveying process, the first coating assembly 4 and the second coating assembly 5 cooperate to perform the coating operation, and the water-based coating slurry is applied to both sides of the fabric. Specifically:

[0045] like Figure 5 As shown, the first coating assembly 4 includes a first telescopic cylinder 41, a first bracket 42 and a first coating plate 43. The first telescopic cylinder 41 is installed through the bracket structure, and it connects and controls the telescopic movement of the first bracket 42. In order to ensure the stable installation of the first bracket 42, it is connected to the bracket structure with a guide rod, which plays a guiding role and improves the stability of the installation. The first bracket 42 is used to install the first coating plate 43. The two sides of the first coating plate 43 are enclosed by the first bracket 42, so that the left side, the right side and the rear end of the first coating plate 43 are all enclosed, and only the front end is open, so that the fabric passing through the front end can be coated. The first coating plate 43 is tilted downward from the rear end to the front end. During the coating process, the first coating plate 43 contacts the fabric, and the water-based coating slurry can accumulate on the first coating plate 43, providing sufficient water-based coating slurry to the first coating plate 43, so as to achieve the purpose of continuously coating the water-based coating slurry to one side of the fabric.

[0046] like Figure 6As shown, the second coating assembly 5 includes a second telescopic cylinder 51, a second bracket 52 and a second coating plate 53. The second telescopic cylinder 51 is installed through the bracket structure, and is connected to and controls the extension and retraction of the second bracket 52. In order to ensure the stable installation of the second bracket 52, it is connected to the bracket structure with a guide rod, which plays a guiding role and improves the stability of the installation. The second bracket 52 is used to install the second coating plate 53. The two sides of the second coating plate 53 are enclosed by the second bracket 52, so that the left side, the right side and the rear end of the second coating plate 53 are all enclosed, and only the front end is open, so that the fabric passing through the front end can be coated. The second coating plate 53 is tilted downward from the rear end to the front end. During the coating process, the second coating plate 53 contacts the fabric, and the water-based coating slurry can accumulate on the second coating plate 53, providing sufficient water-based coating slurry to the second coating plate 53, so as to achieve the purpose of continuously coating the water-based coating slurry to the other side of the fabric.

[0047] With the cooperation of the first coating component 4 and the second coating component 5, the aqueous coating slurry can be continuously coated on both sides of the fabric.

[0048] During the coating operation, the first bracket 42 and the second bracket 52 are controlled in advance by the first telescopic cylinder 41 and the second telescopic cylinder 51 to extend forward. The extended first bracket 42 and the second bracket 52 are assembled with each other to enclose the first coating plate 43 and the second coating plate 53, and the fabric passes through them at the same time. Such an arrangement can not only limit the conveying position of the fabric, so that the first coating component 4 and the second coating component 5 can apply the water-based coating slurry to the surface of the fabric, but also form an enclosed space to accumulate the water-based coating slurry on the first coating plate 43 and the second coating plate 53 to avoid slurry loss.

[0049] In the actual coating operation, it is found that different fabrics have different thicknesses, and different coating processes have different requirements for the distance between the coating plate and the fabric. In order to achieve the purpose of adjusting the position of the coating plate, the following designs are made, such as Figure 5 and Figure 6As shown: the first bracket 42 is detachably provided with a first adjustment plate 45 at the joint, and the second bracket 52 is detachably provided with a second adjustment plate 55 at the joint. The above-mentioned detachable connection method can be a snap-on method, a magnetic attraction method or a bolt connection method. The first adjustment plate 45 is provided with a contact sensor 451, and the first telescopic cylinder 41 and the second telescopic cylinder 51 are controlled by the contact sensor 451, that is, when the contact sensor 451 of the first adjustment plate 45 contacts the corresponding second adjustment plate 55, the telescopic in-place signal is recognized, and the first telescopic cylinder 41 and the second telescopic cylinder 51 are controlled to stop, and the first bracket 42 and the second bracket 52 are spliced ​​with each other. The first adjustment plate 45 includes types with different widths, and the second adjustment plate 55 includes types with different widths. By replacing the first adjustment plate 45 and the second adjustment plate 55 with different widths, the distance between the first coating plate 43 and the second coating plate 53 can be adjusted, thereby adjusting the distance between the first coating plate 43 and the fabric and the distance between the second coating plate 53 and the fabric. The mechanical coating device of the present invention is suitable for fabrics of different thicknesses and meets the requirements of different coating processes, and has an ingenious design and a practical structure.

[0050] like Figure 7 As shown, the first coating component 4 also includes a first slurry recoverer 44, which includes a first material receiving box 441 and a first recovery tube 442. The first material receiving box 441 is connected to the first bracket 42 through connectors on both sides, and is provided with a first drainage nozzle 443. The first drainage nozzle 443 is arranged below the first coating plate 43 and is arch-shaped, for receiving the leaked aqueous coating slurry and draining it into the first material receiving box 441. The interior of the first material receiving box 441 is funnel-shaped and can drain downward into the first recovery tube 442. The first recovery tube 442 is detachably mounted on the lower end of the first material receiving box 441, and the detachable method can be a threaded connection method, a snap connection method, or a magnetic connection method, etc. The aqueous coating slurry flows from the first material receiving box 441 into the first recovery tube 442, and the first recovery tube 442 collects the leaked aqueous coating slurry and reuses it, so as to achieve the purpose of fully utilizing the aqueous coating slurry;

[0051] The second coating assembly 5 also includes a second slurry recovery device 54. The structure of the second slurry recovery device 54 is the same as that of the first slurry recovery device 44. Figure 7The second slurry recovery device 54 includes a second material receiving box and a second recovery tube. The second material receiving box is connected to the second bracket 52 through the connecting pieces on both sides. It is provided with a second drainage nozzle. The second drainage nozzle is arranged below the second coating plate 53 and is in an arch shape. It is used to receive the leaked aqueous coating slurry and drain it into the second material receiving box. The interior of the second material receiving box is funnel-shaped and can drain downward into the second recovery tube. The second recovery tube is detachably installed at the lower end of the second material receiving box. The detachable method can be a threaded connection method, a snap connection method, or a magnetic connection method. The aqueous coating slurry flows from the second material receiving box into the second recovery tube. The second recovery tube collects the leaked aqueous coating slurry and reuses it, so as to achieve the purpose of fully utilizing the aqueous coating slurry.

[0052] like Figures 2 to 4 As shown, the feeding mechanism 3 is arranged on both sides of the left and right sides of the body 1, corresponding to the first coating component 4 and the second coating component 5 respectively, and installed above the first coating component 4 and the second coating component 5 respectively. The feeding mechanism 3 includes a mounting frame 31 and a slurry box 32 connected to the mounting frame 31. The slurry box 32 is used to store water-based coating slurry and provide water-based coating slurry to the first coating plate 43 and the second coating plate 53; automatic switches 33 are installed at the bottom openings of the feeding mechanisms 3 on the left and right sides, and the automatic switches 33 include a switch cylinder 331 and a cover 332. The switch cylinder 331 is connected to and controls the movement of the cover 332. When the switch cylinder 331 is extended, the cover 332 is driven to separate from the bottom opening, thereby opening the bottom opening. When the switch cylinder 331 is retracted, the cover 332 is driven to approach the bottom opening, thereby closing the bottom opening, thereby achieving the purpose of blocking or opening the bottom opening;

[0053] An infrared receiver (not shown) is provided at the lower end of the cover 332, and infrared transmitters 431 are provided at corresponding positions of the first coating plate 43 and the second coating plate 53. The infrared transmitter 431 and the infrared receiver match each other. With the help of the infrared receiver and the infrared transmitter 431, the automatic switch 33 is controlled to open or close the feeding. Specifically: when the water-based coating slurry on the first coating plate 43 or the second coating plate 53 is less than the specified amount, the infrared transmitter 431 is exposed and transmits an infrared signal to the corresponding infrared receiver. After receiving the infrared signal, the infrared receiver controls the automatic switch 33 to start and feed the material to the coating plate, thereby achieving the purpose of automatic detection and automatic feeding.

[0054] The mechanical coating device has a pre-drying mechanism 6. After coating, the fabric enters the pre-drying mechanism 6 for pre-drying. After pre-drying, the water-based coating slurry on the surface of the fabric is not easily contaminated on the roller.

[0055] The coating process of the mechanical coating device is as follows:

[0056] 1. Introduce the fabric into the mechanical coating device and control the tension roller 24 to adjust the tension of the fabric to the optimum.

[0057] 2. The first telescopic cylinder 41 and the second telescopic cylinder 51 control the first bracket 42 and the second bracket 52 to be assembled.

[0058] 3. The feeding mechanism 3 feeds materials to the first coating plate 43 and the second coating plate 53 .

[0059] 4. The fabric begins to be conveyed. During the conveying process, the first coating assembly 4 and the second coating assembly 5 continuously coat the fabric.

[0060] 5. During the coating process, the feeding mechanism 3 automatically feeds materials to the first coating plate 43 and the second coating plate 53 to ensure that the water-based coating slurry is sufficient.

[0061] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A method for preparing a novel durable polyurethane water-based coating fabric, characterized in that The steps include: 90-110 parts of (2-hydroxyethyl) triphenylphosphine chloride modified waterborne polyurethane and 75-90 parts of flame retardant, 0.1-0.5 parts of dispersant, 0.1-0.5 parts of wetting agent, 8-12 parts of high concentration carbodiimide crosslinking agent, 1-3 parts of brightener, 14-18 parts of titanium dioxide, and 0.1-0.5 parts of defoamer are mixed to obtain a water-based coating slurry; The aqueous coating slurry is applied to the surface of the fabric substrate and dried at 90-120° C. After being completely dried, an aqueous coating is formed on the surface of the fabric substrate.

2. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 1, characterized in that: The flame retardant is one or more combinations of magnesium hydroxide, aluminum hydroxide, and nano-layered silicate; the wetting agent is one of polyether-modified organic silicon, modified polysiloxane, or organic siloxane copolymer.

3. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 1, characterized in that: The dispersant is one or more of sodium dodecylbenzene sulfonate, polymethacrylic acid, lauryl alcohol ether phosphate, sodium citrate, polyvinylpyrrolidone, and fatty alcohol polyoxyethylene ether.

4. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 1, characterized in that: The defoamer is one of defoamer 204, organosilicon defoamer PLX-4060 or polyurethane defoamer DE-0389; the brightener is one of diphenylethylene type, pyrazoline type and phthalimide type.

5. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 1, characterized in that: A mechanical coating device is used to coat the water-based coating slurry on the surface of a fabric substrate. The mechanical coating device includes a body and a cloth feeding mechanism, a coating mechanism and a feeding mechanism installed on the body. The cloth feeding mechanism is used to transport the fabric and give the fabric tension to put it in a tensioned state. The coating mechanism is used to cooperate with the cloth feeding mechanism to coat the water-based coating slurry on the surface of the fabric being transported. The feeding mechanism is used to provide the water-based coating slurry to the coating mechanism.

6. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 5, characterized in that: The coating mechanism includes a first coating assembly on the left and a second coating assembly on the right. The fabric passes between the first coating component and the second coating component, and the two cooperate with each other to coat the water-based coating slurry on both sides of the fabric; the first coating component includes a first telescopic cylinder, a first bracket and a first coating plate, the first telescopic cylinder is connected to and controls the telescopic movement of the first bracket, the first bracket is used to install the first coating plate, the two sides of the first coating plate are surrounded by the first bracket, and the first coating plate is tilted, during the coating process, the water-based coating slurry accumulates on the first coating plate; the second coating component includes a second telescopic cylinder, a second bracket and a second coating plate, the second telescopic cylinder is connected to and controls the telescopic movement of the second bracket, the second bracket is used to install the second coating plate, the two sides of the second coating plate are surrounded by the second bracket, and the second coating plate is tilted, during the coating process, the water-based coating slurry accumulates on the second coating plate.

7. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 6, characterized in that: During the coating process, the first bracket and the second bracket are assembled with each other to enclose the first coating plate and the second coating plate; a first adjustment plate is detachably provided at the assembly point of the first bracket, and a second adjustment plate is detachably provided at the assembly point of the second bracket, and the first adjustment plate is provided with a contact sensor, and the first telescopic cylinder and the second telescopic cylinder are controlled by the contact sensor; the first adjustment plate includes types with different widths, and the second adjustment plate includes types with different widths. By replacing the first adjustment plate and the second adjustment plate of different widths, the distance between the first coating plate and the second coating plate is adjusted, thereby adjusting the distance between the first coating plate and the fabric and the distance between the second coating plate and the fabric.

8. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 6, characterized in that: The first coating component also includes a first slurry recoverer, which includes a first material receiving box and a first recovery tube. The first material receiving box is connected to the first bracket and is provided with a first drainage nozzle. The first drainage nozzle is arranged below the first coating plate and is used to receive the leaked aqueous coating slurry and drain it into the first material receiving box. The first recovery tube is detachably installed at the lower end of the first material receiving box. The aqueous coating slurry flows from the first material receiving box into the first recovery tube. The first recovery tube collects the leaked aqueous coating slurry and reuses it. The second coating component also includes a second slurry recoverer, which includes a second material receiving box and a second recovery tube. The second material receiving box is connected to the second bracket and is provided with a second drainage nozzle. The second drainage nozzle is arranged below the second coating plate and is used to receive the leaked aqueous coating slurry and drain it into the second material receiving box. The second recovery tube is detachably installed at the lower end of the second material receiving box. The aqueous coating slurry flows from the second material receiving box into the second recovery tube. The second recovery tube collects the leaked aqueous coating slurry and reuses it.

9. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 6, characterized in that: The feeding mechanism is arranged on both sides of the left and right sides of the body, corresponding to the first coating component and the second coating component respectively, and installed above the first coating component and the second coating component. The feeding mechanism includes a mounting frame and a slurry box connected to the mounting frame, and the slurry box is used to store water-based coating slurry and provide water-based coating slurry to the first coating plate and the second coating plate; an automatic switch is installed at the bottom opening of the feeding mechanism, and the automatic switch includes a switch cylinder and a cover, and the switch cylinder is connected to and controls the movement of the cover, and the cover is used to block or open the bottom opening; an infrared receiver is provided at the lower end of the cover, and an infrared transmitter is provided on the first coating plate and the second coating plate, and the infrared transmitter and the infrared receiver match each other, and the automatic switch is controlled to open or close the feeding with the help of the infrared receiver and the infrared transmitter.

10. The method for preparing a novel durable polyurethane water-based coating fabric according to claim 6, characterized in that: The cloth feeding mechanism includes a cloth feed roller, an upper guide roller, a lower guide roller, a tension roller and a cloth discharge roller. The upper guide roller and the lower guide roller are used to adjust the top-to-bottom conveying direction and conveying position of the fabric so that it passes between the first coating assembly and the second coating assembly. The tension roller is connected to a lifting cylinder, and the height position of the tension roller is adjusted by the lifting cylinder, thereby adjusting the tension of the fabric.

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