CN115491908B - Preparation method of coating based on waste silk nylon fibers - Google Patents

Abstract

The invention discloses a coating preparation method based on waste silk nylon fiber, which includes the following steps: (1) Preparing a base layer: taking a non-woven fabric as the base layer, the non-woven fabric is punctured with a needle and then reinforced; (2) ) Prepare the coating slurry: prepare the nylon solution of the coating layer and the silk solution of the coating layer respectively, and mix the two to obtain the coating slurry; (3) Prepare the coating layer: apply the coating slurry on the non-woven fabric The base layer forms the coating layer. The coating slurry of the present invention is not prepared from a single raw material. Two materials with different properties are mixed in proportion to increase functionality. The invention has a non-woven fabric layer and a silk/nylon mixed coating. The silk coating has good skin-friendly properties and breathability. It can be used close to the body and has antibacterial effects. Nylon coating has the advantages of high mechanical strength, good toughness, and corrosion resistance. Use the mixed liquid as coating slurry for coating. A combination of the two will produce a better product effect.

Description

A coating preparation method based on waste silk nylon fiber

Technical field

The invention belongs to the technical field of recycling waste silk and nylon, and specifically relates to a coating preparation method based on waste silk nylon fiber.

Background technique

Silk feels very delicate and smooth, has no pollution or irritation, has good skin-friendly effect, has good moisture absorption and moisture release properties, has a constant temperature effect on human skin, and can quickly absorb human sweat and evaporate, effectively preventing the spread of mites and bacteria. Breeding is usually done on textiles that are in direct contact with the human body.

As the demand for textiles increases, the amount of discarded textiles is also increasing. The treatment methods are to incinerate or bury them. This method will pollute the environment, harm the soil, and cause a waste of resources. If waste textiles are recycled and reused, the supply of raw materials to the textile industry can be increased, costs can be saved, and environmental pollution can be reduced. Silk recycling methods include heat energy recovery, silk protein degradation and utilization, physical transformation and chemical transformation of waste silk for reuse. The recycling of nylon generally uses degradation under acidic conditions to recover oxalic acid and ethylenediamine.

In actual production applications, it was found that if silk is dissolved and used as a coating agent alone, the coating effect will be poor. However, after the nylon waste wire is dissolved, it can be coated on the surface of the substrate. Therefore, in order to make better use of silk, silk and waste nylon are blended. Since the waste nylon dissolving system cannot dissolve silk, it is necessary to dissolve the silk separately and then blend it with nylon pulp. However, the two dissolving systems are incompatible with each other. When mixed, nylon is easy to precipitate. It can be seen that researching a suitable blending method is an urgent problem that needs to be solved.

Digital jet printing technology is one of the main production processes in the printing and dyeing industry. The ink required in digital jet printing is water-soluble, so the fabric must be sized before printing so that the dye after printing can be fixed on the surface of the fabric.

Contents of the invention

The purpose of the present invention is to provide a coating preparation method based on waste silk nylon fiber, using non-woven fabric as the base layer, and using silk/nylon mixed coating slurry for coating finishing, combining the advantages of the two, and product effect better.

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

A coating preparation method based on waste silk nylon fiber, which is characterized by including the following steps:

(1) Prepare the base layer: take a non-woven fabric as the base layer, and puncture the non-woven fabric with a needle and then reinforce it;

(2) Prepare coating slurry: Prepare the nylon solution for the coating layer and the silk solution for the coating layer respectively, and mix the two to obtain the coating slurry;

(3) Preparing the coating layer: Coat the coating slurry on the non-woven fabric base layer to form a coating layer.

After optimization, the nylon solution of the coating layer is dissolved with methanol/calcium chloride to obtain a nylon solution.

After optimization, take 10 to 14 parts of nylon waste silk raw materials, cut them into pieces, mix 90 to 110 parts of methanol and 30 to 45 parts of calcium chloride and stir evenly, raise the temperature to 65 to 75°C, connect the condenser tube, and start the reaction. Add nylon waste silk, the reaction will be complete after 40 to 60 minutes, and a nylon solution will be obtained.

After optimization, the coating layer silk solution is dissolved in the silk with a ternary solvent of calcium chloride, water, and ethanol to obtain the silk solution.

After optimization, weigh 50 to 70 parts of calcium chloride, 72 to 100 parts of water: 40 to 60 parts of ethanol, mix the three and stir evenly, raise the temperature to 65 to 75°C, connect the condenser tube, and weigh 7 to 12 A portion of silk cloth was cut into pieces and added to the ternary solvent. The reaction was completed for 3 to 5 hours to obtain a silk solution; the molar ratio of calcium chloride, water and ethanol was 1:8:2, and the bath ratio was 1:20.

After optimization, the ratio of the silk solution to the nylon solution is (1 to 5): 5. After the two solutions are mixed, the filler calcium carbonate is added. The mass ratio of the mixed solution to the added calcium carbonate is 1: (3 to 5). Stir. Mix the solution until the calcium carbonate is completely dissolved to obtain a coating slurry.

After optimization, the step (3) uses dry coating or wet coating to apply the coating slurry to the non-woven fabric base layer:

The dry coating: the finished non-woven fabric is laid flat and fixed, the coating slurry is extruded onto the non-woven fabric along the width direction of the non-woven fabric, scraped evenly along the length direction with a scraper, and dried at 120°C;

The wet coating: Pour the prepared coating slurry into a tray. The size of the tray can allow the non-woven fabric to be laid flat. The non-woven fabric is immersed in the coating slurry so that both front and back sides are fully immersed. Use lifting Take out the non-woven fabric, remove excess slurry on the surface, put it into 9% methanol solution to solidify the surface slurry, and then put it into an oven at 120°C to dry to obtain the finished product.

After optimization, the dry coating is completed on a coating machine. The coating machine includes an organic table, a sizing mechanism and a scraping mechanism. The machine table includes frames on both sides and a conveyor belt in the middle. The conveyor belt There is guide tape on the surface; the scraping mechanism includes a bracket and a scraper assembly. The supports on both sides of the bracket are fixed on the frames on both sides. The scraper assembly includes a shaft, a pressure plate, a scraper and a motor unit. The shaft and pressure plate fix the Scraper, both sides of the shaft are connected to the brackets on both sides, and one side is connected to the motor unit. The motor unit controls the rotation of the shaft, and the angle of rotation is controlled between 0-90°; the sizing mechanism includes a sliding table mold Set, sizing head, screw extruder, extrusion head and slurry hopper. The sliding table module is installed on the bracket. The sizing head is installed on the slide block of the sliding table module. The sizing head is used to install the screw extruder. The screw extruder is equipped with a screw for extrusion and adopts a twin-screw structure. The lower end of the screw extruder is connected to the extrusion head, and a feed port is provided on the side. The feed port is connected to a discharge pipe. , the upper end of the unloading pipe fitting is connected to the slurry hopper, and the slurry hopper is filled with coating slurry;

Dry coating processes include:

a. Distribution: The rolled non-woven fabric is installed on the discharging mechanism of the coating machine. After adjusting the tension, flatly fix the front end of the non-woven fabric to the conveyor guide belt; restart the conveyor guide belt; The belt moves forward L and then stops;

b. Sizing: At this time, the sizing machine head is started. It first moves from the right side of the bracket to the left side to prepare for sizing. After sizing starts, the sizing machine head moves linearly from left to right. During the movement, the screw extruder moves on the non-woven fabric. Extrude uniform slurry in the width direction. After the extrusion is completed, the sizing machine head is reset to the right bracket;

c. Squeegee: Then rotate the shaft 90° in the forward direction with the scraper facing downwards. At the same time, start the conveyor belt again. The conveyor belt will move forward again and then stop. During the advancement, the scraper will evenly apply the coating slurry on the surface. On the non-woven fabric of the current L length section;

d. Repeat the above sizing and scraping steps until the dry coating process of the entire non-woven fabric is completed; and reversely rotate the shaft 90° and place the scraper horizontally.

The invention is designed with a coating machine. The coating machine realizes the automatic sizing function through the sizing mechanism. The scraping mechanism cooperates with the conveying action of the conveyor belt to realize the function of automatically scraping the pulp onto the non-woven fabric, thereby achieving continuous and automatic mechanization. The purpose of dry coating is to significantly improve the efficiency of dry coating without manual operation, avoid errors and omissions that are inevitable in manual operation, and improve the effect of dry coating.

The sizing mechanism uses a screw mechanism to extrude the viscous slurry and delivers it to the extrusion head in a directional manner, so that it can be extruded evenly and orderly onto the non-woven fabric; the sizing head achieves left and right linear motion at a constant speed through the slide module. The structure is simple and the design is clever.

The scraper assembly of the scraping structure is connected to a motor unit. The motor in the motor unit is a bidirectional asynchronous motor that can rotate forward and reverse, and is connected to a reducer to adjust the speed. Based on this motor unit, the scraper assembly is rotatable, and the rotation The range is limited to 0-90°, allowing the scraper assembly to switch between working and non-working states. The structure is cleverly designed to protect the scraper when the scraper assembly is not working.

The surface of the conveyor guide belt is provided with guide tape glue, which makes it have a certain stickiness and can adhere to the non-woven fabric, so that it can be laid flat on the conveyor guide belt to prevent the non-woven fabric from wrinkles during the slurry coating process.

After optimization, the coating machine is also equipped with a cloth pressing mechanism on the machine table. The cloth pressing mechanism is closer to the cloth discharging mechanism than the sizing mechanism. The cloth pressing mechanism includes a cloth pressing frame, a cloth pressing cylinder, a cloth pressing plate and a pressing machine. Cloth guide rod, the cloth pressing cylinder is installed on the cloth pressing frame, and the lower end of the cloth pressing cylinder is connected to the cloth pressing plate. The cloth pressing guide rod has a telescopic structure, with one end fixed to the cloth pressing plate and the other end fixed to the cloth pressing frame;

During the sizing process in step b of dry coating, the cloth pressing cylinder is started synchronously, and the cloth pressing plate is controlled to press down so that it squeezes the non-woven fabric for 3 seconds. After 3 seconds, the cloth pressing cylinder and the cloth pressing plate are reset; each time Repeat the above pressing process during the sizing process.

The cloth pressing mechanism realizes automatic cloth pressing operation, making the non-woven fabric close to the conveyor guide belt, and the cloth press mechanism works synchronously with the sizing process to achieve the purpose of intermittent cloth pressing, so that the non-woven fabric always remains on the conveyor guide belt. Smooth conveying improves the uniformity of squeegee.

After optimization, the coating machine is also equipped with a dryer. The scraped non-woven fabric is peeled off from the conveyor belt, and a guide cloth is connected to the front-end non-woven fabric. Through the guide cloth, the non-woven fabric is removed from the The cloth is fed into the dryer, and the temperature inside the dryer is maintained at 120°C; with the continuous scraping operation, the non-woven fabric moves on the coating machine, and the non-woven fabric in the dryer moves forward accordingly and Finally, it is sent out from the cloth outlet of the dryer, and the sent non-woven fabric is wound on the roll, thus forming a continuous operation of sizing-scraping-drying. The dryer of the present invention is used in conjunction with the coating machine. After the coating is completed, it is sent into the dryer through the cloth inlet, and follows the marching rhythm of the sizing to perform traveling drying, thereby realizing sizing-scraping-drying. The dry integrated continuous operation can be dried directly after the scraping is completed, without moving and waiting for drying, which significantly improves the efficiency and effect of dry coating.

Due to the adoption of the above technical solution, the following beneficial effects are achieved:

The coating slurry of the present invention is not prepared from a single raw material. Two materials with different properties are mixed in proportion to increase functionality. The invention has a non-woven fabric layer and a silk/nylon mixed coating. The silk coating has good skin-friendly properties and breathability. It can be used close to the body and has antibacterial effects. Nylon coating has the advantages of high mechanical strength, good toughness, and corrosion resistance. Use the mixed liquid as coating slurry for coating. A combination of the two will produce a better product effect.

The invention is designed with a coating machine. The coating machine realizes the automatic sizing function through the sizing mechanism. The scraping mechanism cooperates with the conveying action of the conveyor belt to realize the function of automatically scraping the pulp onto the non-woven fabric, thereby achieving continuous and automatic mechanization. The purpose of dry coating is to significantly improve the efficiency of dry coating without manual operation, avoid errors and omissions that are inevitable in manual operation, and improve the effect of dry coating.

The dryer of the present invention is used in conjunction with the coating machine. After the coating is completed, it is sent into the dryer through the cloth inlet, and follows the marching rhythm of the sizing to perform traveling drying, thereby realizing sizing-scraping-drying. The dry integrated continuous operation can be dried directly after the scraping is completed, without moving and waiting for drying, which significantly improves the efficiency and effect of dry coating.

Description of the drawings

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

Figure 1 is a schematic structural diagram of the coating machine of the present invention;

Figure 2 is a schematic structural diagram of the sizing mechanism and scraping mechanism;

Figure 3 is a schematic structural diagram of the scraping mechanism;

Figure 4 is a schematic structural diagram of the sizing mechanism;

Figure 5 is a schematic structural diagram of the cloth pressing mechanism;

Figure 6 is a schematic structural diagram of the dryer.

Detailed ways

The present invention aims to provide a coating preparation method based on waste silk nylon fiber, using non-woven fabric as the base layer, and using silk/nylon mixed coating slurry for coating finishing, combining the advantages of the two, and the product effect is better good.

The present invention will be further described below in conjunction with specific examples:

Example 1

Step 1: Dissolve nylon waste silk to prepare a nylon waste silk solution, including:

Take 12 parts of nylon waste silk raw materials, cut them into pieces, mix 100 parts of methanol and 35 parts of calcium chloride, stir evenly, raise the water bath temperature to 70°C, connect the condenser tube, start the reaction for a period of time, put the nylon waste silk in, 45 minutes After the reaction is complete, the solution is taken out as solution A.

Step 2: Use silk cloth to prepare silk solution, including:

Prepare calcium chloride aqueous solution. Weigh 55.5 parts of calcium chloride. Weigh 82 parts of water and 46 parts of ethanol according to the molar ratio of calcium chloride: water: ethanol of 1:8:2. Mix the three and stir evenly. Raise the temperature of the water bath to 70°C, connect the condenser tube, weigh 9 parts of silk cloth according to the bath ratio of 1:20, cut it into pieces, add it to the mixed solution for reaction, after 4 hours the reaction is complete, take out the solution and use it as solution B.

Step 3: Prepare coating slurry, mix solution A and solution B in different proportions and then add fillers, including:

Mix 100 parts of mixed solution A and 100 parts of solution B. After mixing the two solutions, add 50 parts of filler calcium carbonate. Stir the mixed solution for 1 hour until the calcium carbonate is completely dissolved to obtain a coating slurry.

Step 4: Use dry coating to apply the coating slurry to the non-woven fabric base layer:

The dry coating: the finished non-woven fabric is laid flat and fixed, the coating slurry is extruded onto the non-woven fabric along the width direction of the non-woven fabric, scraped evenly along the length direction with a scraper, and dried at 120°C to obtain finished product;

Example 2

Step 1: Dissolve nylon waste silk to prepare a nylon waste silk solution, including:

Take 12 parts of nylon waste silk raw materials, cut them into pieces, mix 100 parts of methanol and 35 parts of calcium chloride, stir evenly, raise the water bath temperature to 70°C, connect the condenser tube, start the reaction for a period of time, put the nylon waste silk in, 45 minutes After the reaction is complete, the solution is taken out as solution A.

Step 2: Use silk cloth to prepare silk solution, including:

Prepare calcium chloride aqueous solution. Weigh 55.5 parts of calcium chloride. Weigh 82 parts of water and 46 parts of ethanol according to the molar ratio of calcium chloride: water: ethanol of 1:8:2. Mix the three and stir evenly. Raise the temperature of the water bath to 70°C, connect the condenser tube, weigh 9 parts of silk cloth according to the bath ratio of 1:20, cut it into pieces, add it to the mixed solution for reaction, after 4 hours the reaction is complete, take out the solution and use it as solution B.

Step 3. Prepare coating slurry: Mix 100 parts of mixed solution A and 80 parts of solution B. After mixing the two solutions, add 50 parts of filler calcium carbonate. Stir the mixed solution for 1 hour until the calcium carbonate is completely dissolved to obtain a coating slurry.

Step 4. Use wet coating to apply the coating slurry to the non-woven fabric base layer:

The wet coating: Pour the prepared coating slurry into a tray. The size of the tray can allow the non-woven fabric to be laid flat. The non-woven fabric is immersed in the coating slurry so that both front and back sides are fully immersed. Use lifting Take out the non-woven fabric, remove excess slurry on the surface, put it into 9% methanol solution to solidify the surface slurry, and then put it into an oven at 120°C to dry to obtain the finished product.

Example 3

The dry coating in Example 1 is completed on the coating machine;

The coating machine includes an organic table 1, a sizing mechanism 3 and a scraping mechanism 2. The machine 1 includes frames 11 on both sides and a conveyor guide 13 in the middle. The frames 11 on both sides are used to be installed on the conveyor guide. Belt 13, the surface of the conveying guide belt 13 is provided with guide tape glue, so that its surface has a certain viscosity. The front end of the frame 11 is provided with a cloth discharging mechanism 14. The cloth discharging mechanism 14 is used to install the rolled non-woven fabric, and is provided with corresponding tension rollers to adjust the tension. In addition, a cleaning mechanism and a drying mechanism can be installed below the conveying guide belt 13 to wash away the residual slurry on the surface of the conveying guide belt 13 and quickly dry it for the next sizing and scraping process. The surface of the conveyor guide belt 13 is provided with guide tape glue, which makes it have a certain viscosity and can adhere to the non-woven fabric, so that it can be laid flat on the conveyor guide belt 13 to prevent the non-woven fabric from wrinkles during the slurry coating process.

The scraping mechanism 2 includes a bracket 21 and a scraper assembly 22. The supports 211 on both sides of the bracket 21 are fixed on the frames 11 on both sides. A horizontal axis rod 212 is connected between the supports 211 on both sides. Below the horizontal axis rod 212 A space is formed for installing the scraper assembly 22; the scraper assembly 22 includes a shaft 221, a pressure plate 223, a scraper 222 and a motor unit. The shaft 221 and the pressure plate 223 fix the scraper 222. Both sides of the shaft 221 are connected to the brackets 21 on both sides. , and one side is connected to the motor unit, and the motor unit controls the rotation of the shaft 221, and the rotation angle is controlled between 0-90°;

The scraper assembly 22 is connected to a motor unit. The motor in the motor unit is a bidirectional asynchronous motor that can rotate forward and reverse, and is connected to a reducer for adjusting the speed. Based on this motor unit, the scraper assembly 22 is rotatable, and the rotation range is limited. Within the range of 0-90°, the scraper assembly 22 can switch between working and non-working states. The structure is cleverly designed to protect the scraper 222 when the scraper assembly 22 is not working.

The sizing mechanism 3 includes a slide module 31, a sizing head 32, a screw extruder 35, an extrusion head 36 and a slurry hopper 33. The slide module 31 is installed on the bracket 21, and the sizing head 32 is installed on the slide. On the slider of the module 31; a screw extruder 35 is installed on the front side of the sizing head 32. The screw extruder 35 is equipped with a screw for extrusion and adopts a twin-screw structure. The lower end of the screw extruder 35 The extrusion head 36 is connected, and a feed port is provided on the side. The feed port is connected to a blanking pipe fitting 34, and the upper end of the blanking pipe fitting 34 is connected to a slurry hopper 33, and the slurry hopper 33 is filled with coating slurry.

The sizing mechanism 3 uses a screw mechanism to extrude the viscous slurry, and delivers it to the extrusion head 36 in a directional manner, so that it can be extruded evenly and orderly onto the non-woven fabric; the sizing head 32 realizes left and right movement through the slide module 31 Uniform linear motion, simple structure and clever design. The extrusion head 36 adopts a curved structure, and its extrusion end is inclined toward the scraper assembly 22 so that the extrusion position of the slurry is located near the scraper 222 to avoid uncoated areas of the slurry on the non-woven fabric.

The dry coating process based on this coating machine includes:

a. Cloth discharging: The rolled non-woven fabric is installed on the discharging mechanism 14 of the coating machine. After adjusting the tension, flatly fix the front end of the non-woven fabric to the conveying guide belt 13; restart the conveying guide belt 13. ;The conveying guide belt 13 moves forward L and then stops;

b. Sizing: At this time, the sizing head 32 starts, and first moves from the right side of the bracket 21 to the left side to prepare for sizing; after the sizing starts, the sizing head 32 moves linearly from left to right. During the movement, the screw extruder 35 Extrude uniform slurry in the width direction of the non-woven fabric. After the extrusion is completed, the sizing head 32 is reset to the right bracket 21;

c. Squeegee: Then rotate the shaft 221 90° in the forward direction, with the scraper 222 facing downwards. At the same time, start the conveying guide belt 13 again. The conveying guide belt 13 will move forward again and then stop. During the advancement, the scraper 222 will spread the coating evenly. The lamination slurry is coated on the non-woven fabric of the current L length section;

d. Repeat the above sizing and scraping steps until the dry coating process of the entire non-woven fabric is completed; and reversely rotate the shaft 221 90° and place the scraper 222 horizontally.

The present invention is designed with a coating machine that realizes automatic sizing function through the sizing mechanism 3. The squeegee mechanism cooperates with the conveying action of the conveyor belt 13 to realize the function of automatically squeezing the slurry onto the non-woven fabric, thereby achieving continuous, automatic The purpose of mechanized dry coating is to significantly improve the efficiency of dry coating without manual operation, avoid errors and omissions that are inevitable in manual operation, and improve the effect of dry coating.

The machine table 1 of the coating machine is also provided with a cloth pressing mechanism 4. The cloth pressing mechanism 4 is closer to the cloth discharging mechanism 14 than the sizing mechanism 3. The cloth pressing mechanism 4 includes a cloth pressing frame 41, a cloth pressing cylinder 42, The cloth pressing plate 43 and the cloth pressing guide rod 44. The cloth pressing cylinder 42 is installed on the cloth pressing frame 41. The cloth pressing plate 43 is connected to the lower end of the cloth pressing cylinder 42. The cloth pressing guide rod 44 has a telescopic structure, and one end thereof is fixed on The other end of the cloth pressing plate 43 is fixed to the cloth pressing frame 41;

During the sizing process in step b of the dry coating, the cloth pressing cylinder 42 is started synchronously, and the cloth pressing plate 43 is controlled to press down so that it squeezes the non-woven fabric for 3 seconds. After 3 seconds, the cloth pressing cylinder 42 and the cloth pressing plate 43 are reset. ;Repeat the above pressing process during each sizing process.

The cloth pressing mechanism 4 realizes the automatic cloth pressing operation, so that the non-woven fabric is close to the conveying guide belt 13, and the cloth pressing mechanism 4 cooperates with the sizing process to operate synchronously to achieve the purpose of intermittent cloth pressing, so that the non-woven fabric can be pressed on the conveying guide belt 13 13 always maintains smooth conveying to improve the uniformity of the squeegee.

The coating machine is also equipped with a dryer 5. The non-woven fabric after scraping is peeled off from the conveyor belt 13, and a guide cloth is connected to the non-woven fabric at the front end. Through the guide cloth, the non-woven fabric is removed from the dryer. The cloth is fed into the inlet 51 of the dryer 5, and the temperature in the dryer 5 is maintained at 120°C; with the continuous scraping operation, the non-woven fabric travels on the coating machine, and the non-woven fabric in the dryer 5 moves accordingly. It travels forward and is finally sent out from the cloth outlet of the dryer 5, and the sent non-woven fabric is wound on the roll, thus forming a continuous operation of sizing-scraping-drying. The dryer 5 of the present invention is used in conjunction with the coating machine. After the coating is completed, the cloth is fed into the dryer 5 through the cloth inlet 51 and follows the marching rhythm of the sizing to perform traveling drying, thereby realizing sizing-scraping. The integrated continuous operation of slurry-drying allows the slurry to be dried directly after the squeegee is completed, eliminating the need to move and wait for drying, which significantly improves the efficiency and effect of dry coating.

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 substitutions or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present invention.

Claims (5)

1. A coating preparation method based on waste silk nylon fiber, which is characterized by comprising the following steps: (1) Prepare the base layer: take non-woven fabric as the base layer; (2) Preparation of coating slurry: a. Take 10 to 14 parts of nylon waste silk raw materials, cut them into pieces, mix 90 to 110 parts of methanol and 30 to 45 parts of calcium chloride and stir evenly, raise the temperature to 65 to 75°C, connect the condenser tube, and add after starting the reaction Nylon waste silk, the reaction is complete after 40 to 60 minutes, and a nylon solution is obtained; b. Weigh 50 to 70 parts of calcium chloride, 72 to 100 parts of water: 40 to 60 parts of ethanol, mix the three and stir evenly, raise the temperature to 65 to 75°C, connect the condenser tube, and weigh 7 to 12 parts Cut the silk cloth into pieces and add it to the ternary solvent, react for 3 to 5 hours until it is complete, and obtain a silk solution; among them, the molar ratio of calcium chloride, water and ethanol is 1:8:2, and the bath ratio is 1:20; c. Mix the nylon solution of the coating layer and the silk solution of the coating layer to obtain the coating slurry; the mass ratio of the silk solution and the nylon solution is (1 to 5): 5. After mixing the two solutions, add the filler calcium carbonate , the mass ratio of the mixed solution to the added calcium carbonate is 1: (3-5), stir the mixed solution until the calcium carbonate is completely dissolved to obtain the coating slurry; (3) Preparing the coating layer: Coat the coating slurry on the non-woven fabric base layer to form a coating layer. 2. A coating preparation method based on waste silk nylon fiber according to claim 1, characterized in that: the step (3) adopts dry coating or wet coating to apply the coating slurry to Textile base layer: The dry coating: the finished non-woven fabric is laid flat and fixed, the coating slurry is extruded onto the non-woven fabric along the width direction of the non-woven fabric, scraped evenly along the length direction with a scraper, and dried at 120°C; The wet coating: Pour the prepared coating slurry into a tray. The size of the tray can allow the non-woven fabric to be laid flat. The non-woven fabric is immersed in the coating slurry so that both front and back sides are fully immersed. Use lifting Take out the non-woven fabric, remove excess slurry on the surface, put it into 9% methanol solution to solidify the surface slurry, and then put it into an oven at 120°C to dry to obtain the finished product. 3. A coating preparation method based on waste silk nylon fiber according to claim 2, characterized in that: the dry coating is completed on a coating machine, which includes an organic table, a sizing mechanism and a scraper. The coating mechanism includes frames on both sides and a conveying guide belt in the middle. The surface of the conveying guide belt is provided with guide tape; the scraping mechanism includes a bracket and a scraper assembly, and the supports on both sides of the bracket are fixed on both sides. On the frame, the scraper assembly includes a shaft, a pressure plate, a scraper and a motor unit. The shaft and pressure plate fix the scraper. Both sides of the shaft are connected to the brackets on both sides, and one side is connected to the motor unit. The motor unit The shaft rotates, and the angle of rotation is controlled between 0-90°; the sizing mechanism includes a slide module, a sizing head, a screw extruder, an extrusion head and a slurry hopper. The slide module is installed on the bracket. The sizing head is installed on the slide block of the slide module; the sizing head is used to install a screw extruder. The screw extruder is equipped with a screw for extrusion and adopts a twin-screw structure. The lower end of the screw extruder Connect the extrusion head and have a feed port on the side. The feed port is connected to the blanking pipe fitting. The upper end of the blanking pipe fitting is connected to the slurry hopper, and the slurry hopper is filled with coating slurry; Dry coating processes include: a. Cloth discharging: The rolled non-woven fabric is installed on the cloth discharging mechanism of the coating machine. After adjusting the tension, the front end of the non-woven fabric is flatly fixed to the conveying guide belt; restart the conveying guide belt; The belt moves forward L and then stops; b. Sizing: At this time, the sizing machine head is started. It first moves from the right side of the bracket to the left side to prepare for sizing. After sizing starts, the sizing machine head moves linearly from left to right. During the movement, the screw extruder moves on the non-woven fabric. Extrude uniform slurry in the width direction. After the extrusion is completed, the sizing machine head is reset to the right bracket; c. Squeegee: Then rotate the shaft 90° in the forward direction with the scraper facing downwards. At the same time, start the conveyor belt again. The conveyor belt will move forward again and then stop. During the advancement, the scraper will evenly apply the coating slurry on the surface. On the non-woven fabric of the current L length section; d. Repeat the above sizing and scraping steps until the dry coating process of the entire non-woven fabric is completed; and reversely rotate the shaft 90° and place the scraper horizontally. 4. A coating preparation method based on waste silk nylon fiber according to claim 3, characterized in that: the coating machine is also provided with a cloth pressing mechanism on the machine table, and the cloth pressing mechanism is more precise than the sizing mechanism. Close to the cloth discharging mechanism, the cloth pressing mechanism includes a cloth pressing frame, a cloth pressing cylinder, a cloth pressing plate and a cloth pressing guide rod. The cloth pressing cylinder is installed on the cloth pressing frame. The lower end of the cloth pressing cylinder is connected to a cloth pressing plate. The cloth guide rod has a telescopic structure, with one end fixed to the cloth pressing plate and the other end fixed to the cloth pressing frame; During the sizing process in step b of dry coating, the cloth pressing cylinder is started synchronously, and the cloth pressing plate is controlled to press down so that it squeezes the non-woven fabric for 3 seconds. After 3 seconds, the cloth pressing cylinder and the cloth pressing plate are reset; each time Repeat the above pressing process during the sizing process. 5. A coating preparation method based on waste silk nylon fiber according to claim 3, characterized in that: the coating machine is also equipped with a dryer, and the non-woven fabric after scraping is peeled off from the conveyor belt , and connect the leading cloth to the front-end non-woven fabric. Through the leading cloth, the non-woven fabric is fed from the cloth inlet of the dryer. The temperature inside the dryer is maintained at 120°C; with the continuous scraping operation, The non-woven fabric travels on the coating machine, and the non-woven fabric in the dryer moves forward accordingly and is finally sent out from the outlet of the dryer. The sent non-woven fabric is wound on the roll, thereby forming a sizing- Squeegee-drying is a continuous operation.