CN115491908A - Preparation method of coating based on waste silk nylon fibers - Google Patents

Abstract

The invention discloses a method for preparing a coating based on waste silk nylon fibers, which comprises the following steps: (1) preparing a base layer: taking a non-woven fabric as the base layer, and the non-woven fabric is formed by puncturing with a needle and then reinforced; (2) ) Prepare the coating slurry: prepare the coating layer nylon solution and the coating layer silk solution respectively, and obtain the coating slurry after mixing the two; (3) prepare the coating layer: coat 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 by using a single raw material, but two materials with different properties are mixed according to the proportion, so that the functionality is increased. The invention has a non-woven fabric layer and a silk/nylon mixed coating. The silk coating has good skin-friendly properties and air permeability, and can be used next to the skin when used, and has an antibacterial effect. Nylon coating has the advantages of high mechanical strength, good toughness and corrosion resistance. Use the mixed liquid as the coating slurry for coating, and the combination of the two will make the product more effective.

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 in particular relates to a coating preparation method based on waste silk nylon fibers.

Background technique

Silk feels very delicate and smooth, non-polluting and irritating, 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 volatilize, effectively preventing mites and bacteria. Breeding, usually as textiles that come into direct contact with the human body.

Due to the increasing demand for textiles, the amount of discarded textiles is also increasing. The way to deal with this is to incinerate or bury it. This method will pollute the environment, harm the soil, and cause waste of resources. If the waste textiles are recycled and reused, it can increase the supply of raw materials to the textile industry, save costs and reduce environmental pollution. Silk recovery methods include heat energy recovery, silk protein degradation and utilization, waste silk physical transformation, chemical transformation and reuse. The recovery of nylon is generally carried out under acidic conditions to recover oxalic acid and ethylenediamine.

In actual production and application, it is found that if the silk is dissolved and used as a coating agent alone, the coating effect is not good. However, after the nylon waste silk 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 for use. Since the waste nylon dissolving system cannot dissolve silk, it is necessary to dissolve silk separately and then blend it with nylon pulp. When blending, nylon is easy to precipitate, so it can be seen that researching a suitable blending method is an urgent problem to be solved at present.

Digital printing technology is one of the main production processes in the printing and dyeing industry. The ink required in digital printing is water-soluble, so the fabric must be sized before printing so that the dyes 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 fibers, using non-woven fabric as the base layer, and adopting silk/nylon mixed coating slurry for coating finishing, combining the advantages of the two, the product effect better.

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

A kind of coating preparation method based on waste silk nylon fiber is characterized in that comprising the steps:

(1) Prepare matrix layer: take non-woven fabric as matrix layer, and this non-woven fabric is reinforced after being punctured with needle;

(2) Prepare the coating slurry: prepare the coating layer nylon solution and the coating layer silk solution respectively, and obtain the coating slurry after the two are intermixed;

(3) Preparing the coating layer: coating 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 in methanol/calcium chloride to obtain a nylon solution.

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

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

After optimization, weigh 50-70 parts of calcium chloride, 72-100 parts of water: 40-60 parts of ethanol, mix the three and stir evenly, raise the temperature to 65-75°C, connect the condenser, and weigh 7-12 Parts of silk cloth, shredded and added to the ternary solvent, reacted for 3 to 5 hours until complete to obtain a silk solution; wherein, 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 (1-5):5, and after the two solutions are mixed, filler calcium carbonate is added, and the mass ratio of the mixed solution to the addition of calcium carbonate is 1:(3-5), and the mixture is stirred The solution was mixed until the calcium carbonate was completely dissolved to obtain a coating slurry.

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

The dry coating method: flatten and fix the finished non-woven fabric, extrude the coating slurry onto the non-woven fabric along the width direction of the non-woven fabric, scrape and coat evenly along the length direction with a scraper, and dry at 120°C;

The wet coating: Pour the prepared coating slurry into the tray, the size of the tray can make the non-woven fabric be laid flat, the non-woven fabric is immersed in the coating slurry, so that the front and back sides are fully immersed, and the lifting method is adopted. The non-woven fabric is taken out by the method, and the excess slurry on the surface is removed at the same time, and the surface slurry is solidified in 9% methanol solution, and then dried in an oven at 120° C. to obtain a finished product.

After optimization, the dry coating is completed on a coating machine, which includes an organic platform, a sizing mechanism and a scraping mechanism, and the machine platform includes frames on both sides and a conveying guide belt in the middle, and the conveying guide belt The surface is provided with conductive tape; the scraping mechanism includes a bracket and a scraper assembly, and the supports on both sides of the bracket are fixed on the frames on both sides. Scraper, the two 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 rotation angle is controlled between 0-90°; the sizing mechanism includes a sliding table mold group, sizing head, screw extruder, extrusion head and slurry hopper, the sliding table module is installed on the bracket, and the sizing head is installed on the slider of the sliding table module; the sizing head is used to install the screw extruder 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, and the feed port is connected to the discharge pipe. , the upper end of the feeding pipe is connected to the slurry hopper, and the slurry hopper is filled with coating slurry;

Dry coating processes include:

a. Cloth output: Install the non-woven fabric in the roll on the cloth output mechanism of the coating machine. After adjusting the tension, fix the front end of the non-woven fabric flatly on the conveying guide belt; then start the conveying guide belt; the conveying guide The belt moves forward and stops after L;

b. Sizing: At this time, the sizing machine head starts, and moves from the right side of the bracket to the left side to prepare for sizing; after the sizing starts, the sizing machine head moves linearly from left to right. Extrude uniform slurry in the width direction. After the extrusion is completed, the sizing head is reset to the right bracket;

c. Squeegee: Then rotate the shaft 90° forward, with the scraper facing down, and start the conveyor belt again, and the conveyor belt will move forward again and then stop. During the process, the scraper will evenly coat the coating slurry on the 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 by 90°, and place the scraper horizontally.

The present invention is designed with a coating machine, the coating machine realizes the automatic sizing function through the sizing mechanism, and the squeegee mechanism cooperates with the conveying action of the conveying guide belt to realize the function of automatically squeegeeing the sizing to 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 must exist in human operation, and improve the effect of dry coating.

The sizing mechanism uses a screw mechanism to extrude viscous slurry, which is delivered to the extrusion head in a directional manner, so that it can be uniformly and orderly extruded onto the non-woven fabric; the sizing head realizes the left and right uniform linear motion through the sliding table module, Simple structure and ingenious design.

The scraper assembly of the scraping structure is connected with a motor unit. The motor in the motor unit is a bidirectional asynchronous motor, which can be rotated forward and reverse, and is connected with a reducer for adjusting the speed; The range is limited within the range of 0-90°, so that the scraper assembly can switch between working and non-working states. The structural design is ingenious, and the scraper is protected when the scraper assembly is not working.

The surface of the conveying guide belt is equipped with a guide belt 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 conveying guide belt to prevent the non-woven fabric from wrinkling during the grouting process.

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

During the sizing process of step b of the dry coating, start the cloth press cylinder synchronously, control the cloth press plate to press down, make it squeeze the non-woven fabric for 3 seconds, and reset the cloth press cylinder and the cloth press plate after 3 seconds; Repeat the above cloth pressing process during the sizing process.

The cloth pressing mechanism realizes the automatic cloth pressing operation, so that the non-woven fabric is close to the conveyor belt, and the cloth pressing mechanism works synchronously with the sizing process to achieve the purpose of interval pressing, so that the non-woven fabric is always kept on the conveyor belt Smooth conveying, improve the uniformity of scraping.

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

Owing to adopting above-mentioned technical scheme, have following beneficial effect:

The coating slurry of the present invention is not prepared by using a single raw material, but two materials with different properties are mixed according to the proportion, so that the functionality is increased. The invention has a non-woven fabric layer and a silk/nylon mixed coating. The silk coating has good skin-friendly properties and air permeability, can be used next to the skin, and has an antibacterial effect. Nylon coating has the advantages of high mechanical strength, good toughness and corrosion resistance. Use the mixed liquid as the coating slurry for coating, and the combination of the two will make the product more effective.

The present invention is designed with a coating machine, the coating machine realizes the automatic sizing function through the sizing mechanism, and the squeegee mechanism cooperates with the conveying action of the conveying guide belt to realize the function of automatically squeegeeing the sizing to 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 must exist in human operation, and improve the effect of dry coating.

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

Description of drawings

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

Fig. 1 is the structural representation of coating machine of the present invention;

Fig. 2 is the structural representation of sizing mechanism and scraping mechanism;

Fig. 3 is the structural representation of scraping mechanism;

Fig. 4 is the structural representation of sizing mechanism;

Fig. 5 is a structural schematic diagram of a cloth pressing mechanism;

Figure 6 is a schematic structural view of the dryer.

detailed description

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

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

Example 1

Step 1, using nylon waste silk to dissolve 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 and stir evenly, raise the temperature of the water bath to 70°C, connect the condenser, and put the nylon waste silk in after a period of reaction, 45min After the reaction is complete, the solution is taken out as solution A.

Step 2, using 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, The temperature of the water bath was raised to 70°C, and a condenser was connected. According to the bath ratio of 1:20, 9 parts of silk cloth were weighed, cut into pieces, and added to the mixed solution for reaction. After 4 hours, the reaction was complete, and the solution was taken out as solution B.

Step 3, prepare coating slurry, mix solution A and solution B according to different proportions and add fillers, including:

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

Step 4. Apply the coating slurry to the non-woven fabric substrate layer by dry coating:

The dry coating method: flatten and fix the finished non-woven fabric, extrude the coating slurry onto the non-woven fabric along the width direction of the non-woven fabric, apply it evenly along the length direction with a scraper, and dry it at 120°C to obtain finished product;

Example 2

Step 1, using nylon waste silk to dissolve 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 and stir evenly, raise the temperature of the water bath to 70°C, connect the condenser, and put the nylon waste silk in after a period of reaction, 45min After the reaction is complete, the solution is taken out as solution A.

Step 2, using 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, The temperature of the water bath was raised to 70°C, and a condenser was connected. According to the bath ratio of 1:20, 9 parts of silk cloth were weighed, cut into pieces, and added to the mixed solution for reaction. After 4 hours, the reaction was complete, and the solution was taken out as solution B.

Step 3. Preparation of coating slurry: Mix 100 parts of mixed solution A with 80 parts of solution B, add 50 parts of filler calcium carbonate after the two solutions are mixed, and stir the mixed solution for 1 hour until the calcium carbonate is completely dissolved to obtain a coating slurry.

Step 4. Apply the coating slurry to the non-woven fabric substrate layer by wet coating:

The wet coating: Pour the prepared coating slurry into the tray, the size of the tray can make the non-woven fabric be laid flat, the non-woven fabric is immersed in the coating slurry, so that the front and back sides are fully immersed, and the lifting method is adopted. The non-woven fabric is taken out by the method, and the excess slurry on the surface is removed at the same time, and the surface slurry is solidified in 9% methanol solution, and then dried in an oven at 120° C. to obtain a finished product.

Example 3

The dry coating in embodiment 1 is finished on coating machine;

The coating machine includes an organic platform 1, a sizing mechanism 3 and a scraping mechanism 2. The machine platform 1 includes a frame 11 on both sides and a conveyor belt 13 in the middle. The frames 11 on both sides are used to be installed on the conveyor belt. Belt 13, the surface of conveying guide belt 13 is provided with guide belt glue, makes its surface have certain stickiness. The front end of the frame 11 is provided with a cloth outlet mechanism 14, which is used to install the non-woven fabric in the package, and is provided with a corresponding tension roller to adjust the tension. In addition, a cleaning mechanism and a drying mechanism can also be installed under the conveying guide belt 13 to wash off the residual slurry on the conveying guide belt 13 and quickly dry it to put it into the next sizing and scraping process. The surface of the conveying guide belt 13 is provided with a guide belt glue, which makes it have a certain viscosity and can adhere to the non-woven fabric so that it can be tiled on the conveying guide belt 13 to prevent the non-woven fabric from wrinkling during the grouting process.

The scraping mechanism 2 includes a support 21 and a scraper assembly 22, the supports 211 on both sides of the support 21 are fixed on the frame 11 on both sides, and the support 211 on both sides is connected with a horizontal shaft rod 212, below the horizontal shaft rod 212 Form a space for installing the scraper assembly 22; the scraper assembly 22 includes a shaft 221, a pressing plate 223, a scraper 222 and a motor unit, the shaft 221 and the pressing plate 223 fix the scraper 222, and the two sides of the shaft 221 are connected to the brackets 21 on both sides , and one side thereof is connected to the motor unit, and the shaft rod 221 is controlled by the motor unit to rotate, and the rotation angle is controlled between 0-90°;

The scraper assembly 22 is connected with a motor unit, the motor in the motor unit is a bidirectional asynchronous motor, which can be reversed, and is connected with a reducer for adjusting the speed; based on the motor unit, the scraper assembly 22 is given a rotatable feature, and the rotation range is limited In the range of 0-90°, the scraper assembly 22 can be switched between working and non-working states, and the structure is cleverly designed to protect the scraper 222 when the scraper assembly 22 is not working.

The sizing mechanism 3 includes a sliding table module 31, a sizing head 32, a screw extruder 35, an extrusion head 36 and a slurry hopper 33, the sliding table module 31 is installed on the bracket 21, and the sizing head 32 is installed on the sliding table On the slider of the module 31; the front side of the sizing machine head 32 is equipped with a screw extruder 35, 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 Connect the extrusion head 36, and be provided with feed inlet on the side, connect the feed pipe fitting 34 at the feed inlet place, the upper end of the feed pipe fitting 34 connects the slurry hopper 33, fills coating slurry in the slurry hopper 33.

The sizing mechanism 3 uses a screw mechanism to extrude the viscous slurry, which is delivered to the extrusion head 36 in a directional manner, so as to be uniformly and orderly extruded onto the non-woven fabric; Uniform linear motion, simple structure, ingenious design. The extrusion head 36 adopts a curved structure, and its extrusion end is inclined to the scraper assembly 22, so that the extrusion position of the slurry is located near the scraper 222, so as to avoid uncoated areas of the slurry on the non-woven fabric.

The dry coating process based on this coating machine includes:

a. Cloth output: Install the non-woven fabric in the roll on the cloth output mechanism 14 of the coating machine. After adjusting the tension, fix the front end of the non-woven fabric to the conveying guide belt 13 flatly; then start the conveying guide belt 13 ; Conveyor guide belt 13 moves forward and stops after L;

b. Sizing: At this time, the sizing head 32 starts, and moves from the right side of the support 21 to the left side to prepare for sizing; after the sizing starts, the sizing head 32 moves linearly from left to right. 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 side bracket 21;

c. Squeegee: Then rotate the shaft 221 90° in the forward direction, and the scraper 222 faces down, and at the same time start the conveying guide belt 13 again, and the conveying guide belt 13 moves forward again L and then stops. The layer 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 by 90°, and place the scraper 222 horizontally.

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

The machine platform 1 of the coating machine is also provided with a cloth pressing mechanism 4, which 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 are installed on the cloth pressing frame 41, the lower end of the cloth pressing cylinder 42 is connected with the cloth pressing plate 43, the cloth pressing guide rod 44 is a telescopic structure, and one end thereof is fixed on the Cloth pressing plate 43, the other end is fixed on cloth pressing frame 41;

During the sizing process of step b of the dry coating, start the cloth press cylinder 42 synchronously, control the cloth press plate 43 to press down, make it press the non-woven fabric for 3 seconds, after 3 seconds, the cloth press cylinder 42 and the cloth press plate 43 reset ; Repeat the above cloth 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 works synchronously with the sizing process to achieve the purpose of interval pressing cloth, so that the non-woven fabric is on the conveying guide belt 13. 13. Always maintain smooth conveying to improve the uniformity of squeegee.

This coating machine is also equipped with a dryer 5, the non-woven fabric after the squeegee is peeled off from the conveying guide belt 13, and the leading cloth is connected on the non-woven fabric at the front end, and the non-woven fabric is taken from the drying machine through the leading cloth. The cloth inlet 51 of the dryer 5 is fed in, and the temperature in the dryer 5 is maintained at 120° C.; along with the continuous scraping operation, the nonwoven fabric advances on the coating machine, and the nonwoven fabric in the dryer 5 moves correspondingly. It advances 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-squeegee-drying. The drying machine 5 of the present invention is used in conjunction with the coating machine. After the coating is completed, it is fed into the drying machine 5 through the cloth inlet 51, and it follows the advancing rhythm of sizing to carry out advancing drying, thereby realizing sizing-scraping Slurry-drying integrated continuous operation, can be dried directly after scraping, no 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 replacements or modifications based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are covered by the protection scope of the present invention.

Claims (10)

1. A preparation method of a coating based on waste silk nylon fibers is characterized by comprising the following steps:

(1) Preparing a substrate layer: taking non-woven fabric as a substrate layer;

(2) Preparing coating slurry: respectively preparing a coating layer nylon solution and a coating layer silk solution, and mixing the coating layer nylon solution and the coating layer silk solution to obtain coating slurry;

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

2. The method for preparing the coating based on the waste silk nylon fibers according to claim 1, characterized in that: and dissolving nylon by using the coating layer nylon solution through methanol/calcium chloride to obtain the nylon solution.

3. The preparation method of the coating based on the waste silk nylon fiber according to claim 2, characterized in that: taking 10-14 parts of nylon waste silk raw material, shearing, mixing and uniformly stirring 90-110 parts of methanol and 30-45 parts of calcium chloride, heating to 65-75 ℃, connecting a condenser pipe, adding the nylon waste silk after starting reaction, and reacting completely after 40-60 min to obtain a nylon solution.

4. The preparation method of the coating based on the waste silk nylon fiber according to claim 1, characterized in that: and dissolving the silk in the coating layer with a ternary solvent of calcium chloride, water and ethanol to obtain the silk solution.

5. The preparation method of the coating based on the waste silk nylon fibers according to claim 3, characterized by comprising the following steps: weighing 50-70 parts of calcium chloride and 72-100 parts of water: 40-60 parts of ethanol, mixing and stirring the three, heating to 65-75 ℃, connecting a condenser pipe, weighing 7-12 parts of silk cloth, shearing the silk cloth, adding the silk cloth into a ternary solvent, and reacting for 3-5 hours till the silk solution is completely obtained; wherein, the molar ratio of calcium chloride, water and ethanol is 1.

6. The preparation method of the coating based on the waste silk nylon fiber according to claim 1, characterized in that: the mass ratio of the silk solution to the nylon solution is (1-5): and 5, mixing the two solutions, adding calcium carbonate as a filler, wherein the mass ratio of the mixed solution to the added calcium carbonate is 1 (3-5), and stirring the mixed solution until the calcium carbonate is completely dissolved to obtain the coating slurry.

7. The preparation method of the coating based on the waste silk nylon fiber according to claim 1, characterized in that: and (3) coating the coating slurry on the non-woven fabric substrate layer by adopting a dry coating or a wet coating:

the dry coating method comprises the following steps: spreading and fixing the finished non-woven fabric, extruding the coating slurry onto the non-woven fabric along the width direction of the non-woven fabric, uniformly coating the coating slurry along the length direction by using a scraper, and drying at 120 ℃;

the wet coating comprises the following steps: pouring the prepared coating slurry into a tray, wherein the size of the tray enables the non-woven fabric to be tiled and placed in, the non-woven fabric is immersed into the coating slurry, so that the front side and the back side are fully immersed, taking out the non-woven fabric by adopting a pulling method, removing redundant slurry on the surface, placing the non-woven fabric into 9% methanol solution to solidify the surface slurry, and then placing the non-woven fabric into a 120 ℃ oven for drying to obtain a finished product.

8. The method for preparing a coating based on waste silk nylon fibers according to claim 7, characterized in that: the dry coating is completed on a coating machine, the coating machine comprises a machine table, a sizing mechanism and a blade coating mechanism, the machine table comprises machine frames on two sides and a conveying guide belt in the middle, and guide belt glue is arranged on the surface of the conveying guide belt; the scraping and coating mechanism comprises a support and a scraper component, supports on two sides of the support are fixed on racks on two sides, the scraper component comprises a shaft lever, a pressing plate, a scraper and a motor set, the scraper is fixed by the shaft lever and the pressing plate, two sides of the shaft lever are connected into the supports on two sides, one side of the shaft lever is connected with the motor set, the shaft lever of the motor set rotates, and the rotating angle is controlled between 0 and 90 degrees; the sizing mechanism comprises a sliding table module, a sizing machine head, a screw extruder, an extrusion head and a sizing hopper, wherein the sliding table module is arranged on the bracket, and the sizing machine head is arranged on a sliding block of the sliding table module; the upper pulp machine head is used for mounting a screw extruder, an extrusion screw is mounted in the screw extruder, a double-screw structure is adopted, the lower end of the screw extruder is connected with the extrusion head, a feed port is arranged on the side surface of the screw extruder, the feed port is connected with a blanking pipe fitting, the upper end of the blanking pipe fitting is connected with a pulp hopper, and coating pulp is filled in the pulp hopper;

the dry coating process comprises the following steps:

a. discharging cloth: the rolled non-woven fabric is arranged on a fabric outlet mechanism of a coating machine, and after the tension is adjusted, the front end of the non-woven fabric is flatly fixed on a conveying guide belt; then starting the conveying guide belt; the conveying guide belt stops after advancing forwards by L;

b. sizing: at the moment, the starching machine head is started and moves from the right side to the left side of the bracket to prepare starching; after starching is started, the starching head moves linearly from left to right, in the moving process, the screw extruder extrudes uniform slurry in the width direction of the non-woven fabric, and after the extrusion is finished, the starching head resets to the bracket on the right side;

c. slurry scraping: then the shaft lever is rotated forward by 90 degrees, the scraper faces downwards, the conveying conduction band is started again at the same time, the conveying conduction band stops after advancing forward for L again, and the scraper uniformly coats the coating slurry on the non-woven fabric in the length section of the current L in the advancing process;

d. repeating the steps of sizing and scraping until the dry coating process of the whole section of non-woven fabric is finished; and the shaft lever is rotated reversely by 90 degrees, and the scraper is transversely placed.

9. The method for preparing the coating based on the waste silk nylon fiber according to claim 8, is characterized in that: the machine table of the coating machine is also provided with a cloth pressing mechanism, the cloth pressing mechanism is closer to the cloth discharging mechanism than the sizing mechanism, the cloth pressing mechanism comprises 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 with the cloth pressing plate, the cloth pressing guide rod is of a telescopic structure, one end of the cloth pressing guide rod is fixed on the cloth pressing plate, and the other end of the cloth pressing guide rod is fixed on the cloth pressing frame;

in the sizing process of the step b of dry coating, synchronously starting the cloth pressing cylinder, controlling the cloth pressing plate to press downwards, and enabling the cloth pressing cylinder and the cloth pressing plate to reset after the cloth pressing plate extrudes non-woven fabrics for 3s and 3 s; the cloth pressing process is repeated in each sizing process.

10. The method for preparing a coating based on waste silk nylon fibers according to claim 8, characterized in that: the coating machine is also provided with a dryer, the non-woven fabric subjected to pulp scraping is peeled off from the conveying conduction band, the non-woven fabric at the forefront end is connected with a draw fabric, the non-woven fabric is fed from a fabric inlet of the dryer through the draw fabric, and the temperature in the dryer is kept at 120 ℃; the non-woven fabric advances on the coating machine along with the continuous pulp scraping operation, the non-woven fabric in the dryer correspondingly advances forwards and is finally sent out from a fabric outlet of the dryer, and the sent non-woven fabric is wound on a winding roller, so that the continuous pulp sizing-pulp scraping-drying operation is formed.

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