A method for preparing light-cured coated fabric based on waste polyvinyl butyral

Abstract

The present invention discloses a method for preparing a photocurable coating fabric based on waste polyvinyl butyral, comprising: (1) preparing a maleic anhydride-modified rPVB graft; (2) preparing a maleic anhydride-modified rPVB photocurable coating slurry; and (3) preparing a coated fabric. The method comprises grafting and modifying rPVB with maleic anhydride (MA) containing double bonds, compounding the obtained modified rPVB with hydroxyethyl acrylate (HEA), adding a photoinitiator system to prepare a photocurable coating slurry, and then applying the slurry to fabric to prepare the coated fabric. By recycling, modifying, and reusing the rPVB as a raw material for production, waste materials can be utilized to the maximum extent, truly achieving resource recycling and sustainable economic development.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer modification, and particularly relates to a method for preparing a light-cured coating fabric based on waste polyvinyl butyral. Background Art

[0002] Polyvinyl butyral (PVB) resin is a polymer formed by the aldol condensation of polyvinyl alcohol (PVA) and n-butyraldehyde under acidic conditions to form an acetal group. It exhibits excellent lightfastness, water resistance, film-forming properties, and impact resistance. The PVB molecular structure contains hydroxyl and acetal groups. The hydroxyl groups make PVB soluble in polar or highly polar solvents and provide PVB with strong tear resistance and adhesion. The six-membered ring structure of the acetal group increases the strength and amorphous nature of the PVB molecular chain.

[0003] PVB's excellent properties lend it to a wide range of applications, including interlayer films for safety glass, porcelain decals, insulating varnishes, fiber treatment agents, manufactured parts, printing inks, dyes, and artificial sponges. Among these applications, automotive safety glass interlayer film materials are the most widely used and most important, accounting for over 65% of PVB resin production. With the rapid development of my country's automotive and construction industries, demand for safety glass is increasing year by year. As safety glass interlayer applications become more widespread, market demand and production are growing, leading to a mountain of discarded PVB.

[0004] At present, the main methods of handling plastics in my country are landfill, incineration and recycled granule manufacturing. Landfilling of waste recycled PVB (rPVB) is difficult to corrode and decompose underground, seriously changing the geological structure, and occupies a large area, adding great pressure on land resources. Although incinerating rPVB for power generation can be effectively utilized at a low cost, it will cause serious air pollution. Regenerating granules of rPVB resin is one of the methods with the highest utilization rate and the best recovery rate. By recycling, modifying and reusing rPVB as raw material for production, waste materials can be maximized, truly achieving resource recycling and sustainable economic development. Summary of the Invention

[0005] The present invention aims to provide a method for preparing a photocurable coated fabric based on waste polyvinyl butyral. This method addresses the shortcomings of the prior art by grafting rPVB with double-bond-containing maleic anhydride (MA). The resulting modified rPVB is compounded with hydroxyethyl acrylate (HEA), and a photoinitiator system is added to prepare a photocurable coating slurry. The slurry is then applied to fabric to produce the coated fabric. By recycling, modifying, and reusing the rPVB as raw material for production, the waste material can be maximized, truly achieving resource recycling and sustainable economic development.

[0006] In order to solve the above technical problems, the following technical solutions are adopted:

[0007] A method for preparing a photocurable coated fabric based on waste polyvinyl butyral, characterized by comprising the following steps:

[0008] (1) Preparation of maleic anhydride-modified rPVB grafts: maleic anhydride and rPVB were dissolved in N,N-dimethylformamide (DMF), p-toluenesulfonic acid was used as a catalyst, and the mixture was heated to react for several hours. The mixture was dispersed in distilled water, filtered, and dried to obtain a filter cake, which was the rPVB graft rPVB-M.

[0009] (2) Preparation of maleic anhydride modified rPVB photocurable coating slurry: The modified rPVB grafted product rPVB-M was dissolved in ethanol, and the solvent was evaporated to obtain rPVB-M fluid. The rPVB-M fluid was mixed with HEA solution, and a photoinitiator system was added, and the coating slurry was obtained by ultrasonic dispersion;

[0010] (3) Preparation of coated fabric: The coating slurry is scraped onto the base fabric using a dry coating scraper and irradiated with blue light for a period of time to obtain the coated fabric.

[0011] After optimization, the step (1) is as follows: 1.5 to 6 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid are taken.

[0012] After optimization, the step (1): heating to 40-80° C. and reacting for 2-8 hours.

[0013] Preferably, in step (2), the mixing ratio of the rPVB-M fluid and the HEA solution is 1:(0.5-3).

[0014] After optimization, the step (2): the photoinitiator system includes a photoinitiator camphorquinone (CQ) and a co-initiator ethyl 4-dimethylaminobenzoate (EDB), and the addition amount of the two is 0.5-2.5%.

[0015] After optimization, the step (3): the dry coating is to flatten and fix the base cloth, drip the coating slurry on the base cloth along the width direction, and use a scraper to evenly scrape along the length direction, and the blue light irradiation time is 0 to 120s.

[0016] After optimization, the dry coating of step (3) is completed on a scraping device, and the scraping device includes a lower fixed platform, an upper movable frame and a scraping assembly, the lower fixed platform is used to lay the base cloth, the lower fixed platform is connected to the upper movable frame through a first guide rod, the upper movable frame is connected to a cylinder, and its up and down movement is controlled by the cylinder, the lower end of the upper movable frame is connected to a cloth pressing frame, and the cloth pressing frame cooperates with the lower fixed platform to press the base cloth; the scraping assembly includes a transverse support and a scraping knife provided on the transverse support, transverse sliders are provided on both sides of the transverse support, the upper movable frame is provided with a slide groove, a transverse slide rail is provided in the slide groove, and the transverse slider and the transverse slide rail match each other; the scraping step includes:

[0017] a. First, lay the base fabric flat on the lower fixed platform, start the cylinder to control the upper movable frame and the cloth pressing frame to move downward until the base fabric is pressed tightly, and after the coating slurry is fed to the base fabric, the lateral movement bracket drives the scraper to move horizontally to complete the coating slurry scraping on the base fabric;

[0018] b. After the scraping of the current section is completed, the upper movable frame and the transverse moving bracket are reset, and the base cloth is moved forward until the next section to be scraped enters the lower fixed platform, and the above step a is repeated to complete the scraping operation of the section to be scraped; and the continuous scraping operation is completed by continuously repeating step b.

[0019] Preferably, a sizing assembly is provided on the transverse moving bracket, and the sizing assembly includes a sizing box and an auxiliary sizing module, the sizing box is provided with a back sizing port and a sizing port, the back sizing port is opened on the outside of the sizing box, the sizing port passes through the sizing box up and down, the back sizing port and the sizing port are connected to each other, a cover plate is provided at the lower end port of the sizing port, one side of the cover plate is connected to the lower end port by an elastic hinge, and the other side of the cover plate is magnetically connected to the lower end port by a magnet; the auxiliary sizing module pushes the coating slurry in the sizing port to sizing the base cloth from the lower end port.

[0020] After optimization, the sizing assist module includes a push plate, a push plate bracket, a second guide rod and a control handle. The push plate moves at the sizing port. The push plate is connected to the push plate bracket. The second guide rod is connected between the push plates. The second guide rod passes through the transverse bracket and is connected to the control handle at the other end. The control handle is used to control the push plate to push down the slurry or move up to reset.

[0021] The lifting of the lifting mechanism is to be further increased by 2.0%.The extension socket structure of the present invention is further improved by the expansion joint of the wheelbase and the extension socket structure, and the extension socket structure is further improved by the expansion joint of the wheelbase and the extension socket.

[0022] The above technical solution has the following beneficial effects:

[0023] The invention makes full use of the performance of maleic anhydride structure and performs water-based grafting modification on water-insoluble PVB, which not only improves the hydrophilicity of the grafted product but also introduces double bonds, which can be cured under light irradiation, thereby increasing the hardness of the coated fabric and stabilizing the performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 is the polymerization rate curve of maleic anhydride modified rPVB coating slurry at different modification times;

[0026] Figure 2 This is the heat release curve of maleic anhydride modified rPVB coating slurry at different modification times;

[0027] Figure 3 is the polymerization rate curve of maleic anhydride modified rPVB coating slurry at different modification temperatures;

[0028] Figure 4 The heat release curves of maleic anhydride modified rPVB coating slurry at different modification temperatures;

[0029] Figure 5 The polymerization rate curves of maleic anhydride modified rPVB coating slurry at different mass ratios of rPVB-M to HEA;

[0030] Figure 6 This is the heat release curve of maleic anhydride modified rPVB coating slurry at different mass ratios of rPVB-M to HEA;

[0031] Figure 7 This is the polymerization rate curve of maleic anhydride modified rPVB coating slurry at different initiator contents;

[0032] Figure 8 This is the heat release curve of maleic anhydride modified rPVB coating slurry at different initiator contents;

[0033] Figure 9 It is a structural schematic diagram of the scraping device;

[0034] Figure 10 Schematic diagram of the structure of the lower fixed platform;

[0035] Figure 11 Schematic diagram of the structure of the upper movable frame;

[0036] Figure 12 It is a structural schematic diagram of the scraping assembly;

[0037] Figure 13 It is a structural diagram of the sizing component;

[0038] Figure 14 This is a structural diagram of the sizing aid module;

[0039] Figure 15 is a cross-sectional view of the sizing box;

[0040] Figure 16 It is a structural diagram of the card position component;

[0041] Figure 17 It is a structural diagram of the bracket connected to the locking component part.

[0042] The accompanying drawings are numerals as follows: lower fixed platform 1, base 11, table top 12, first guide rod 13, upper movable frame 2, cloth pressing frame 21, connecting rod 211, pressing plate 212, slide 22, transverse slide rail 221, cylinder 3, transverse support 4, support 41, positioning slide 411, connecting frame 42, sizing assembly 43, sizing box 431, auxiliary sizing module 432, pouring port 4311, sizing port 4312, cover plate 4313, control handle 4321, second guide rod 4322, push plate support 4323, push plate 4324, positioning assembly 44, positioning plate 441, handle 442, limiting protrusion 443, positioning slider 444, spring rod 445, spring 446, transverse slider 45, connecting seat 46, bayonet 461, limiting groove 462. DETAILED DESCRIPTION

[0043] The present invention provides a method for preparing a photocurable coated fabric based on waste polyvinyl butyral. The method involves grafting rPVB with double-bond-containing maleic anhydride (MA). The resulting modified rPVB is then compounded with hydroxyethyl acrylate (HEA), and a photoinitiator system is added to prepare a photocurable coating slurry. The slurry is then applied to fabric to produce the coated fabric. By recycling, modifying, and reusing the rPVB as raw material for production, the waste material can be maximized, truly achieving resource recycling and sustainable economic development.

[0044] The technical solution of the present invention is described in detail below with reference to specific embodiments:

[0045] Example 1

[0046] Step 1: Preparation of maleic anhydride-modified rPVB grafts, comprising:

[0047] Take 3 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid, put them into a three-necked flask and stir evenly, heat to 60°C, connect a condenser, react for 4 hours until the color turns yellow and the reaction is complete, disperse it in distilled water, filter and dry it to obtain the grafted product rPVB-M.

[0048] Step 2: Preparation of maleic anhydride modified rPVB light-curing coating slurry, comprising:

[0049] Take 5 parts of maleic anhydride grafted product, dissolve it in 100 parts of ethanol, and rotary evaporate to obtain rPVB-M fluid. The mixing ratio of the rPVB-M fluid and the HEA solution is 1:2. After the mixed solution is ultrasonically dispersed evenly, a photoinitiator system is added. The amount of photoinitiator CQ and co-initiator EDB added is 1.5%, and ultrasonic dispersion is performed again to obtain a coating slurry.

[0050] Step 3: Preparation of coated fabric, including:

[0051] Lay the base fabric flat and fix it, drop the coating slurry on the base fabric along the width direction, and use a scraper to apply it evenly along the length direction. The blue light irradiation time is 60s.

[0052] Example 2

[0053] Step 1: Preparation of maleic anhydride-modified rPVB grafts, comprising:

[0054] Take 3 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid, put them into a three-necked flask and stir evenly, heat to 60°C, connect a condenser, react for 6 hours until the color turns yellow and the reaction is complete, disperse it in distilled water, filter and dry it to obtain the grafted product rPVB-M.

[0055] Step 2: Preparation of maleic anhydride modified rPVB light-curing coating slurry, comprising:

[0056] Take 5 parts of maleic anhydride grafted product, dissolve it in 100 parts of ethanol, and rotary evaporate to obtain rPVB-M fluid. The mixing ratio of the rPVB-M fluid and the HEA solution is 1:2. After the mixed solution is ultrasonically dispersed evenly, a photoinitiator system is added. The amount of photoinitiator CQ and co-initiator EDB added is 1.5%, and ultrasonic dispersion is performed again to obtain a coating slurry.

[0057] Step 3: Preparation of coated fabric, including:

[0058] Lay the base fabric flat and fix it, drop the coating slurry on the base fabric along the width direction, and use a scraper to apply it evenly along the length direction. The blue light irradiation time is 60s.

[0059] Example 3

[0060] Step 1: Preparation of maleic anhydride-modified rPVB grafts, comprising:

[0061] Take 3 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid, put them into a three-necked flask and stir evenly, heat to 70°C, connect a condenser, react for 6 hours until the color turns yellow and the reaction is complete, disperse it in distilled water, filter and dry it to obtain the grafted product rPVB-M.

[0062] Step 2: Preparation of maleic anhydride modified rPVB light-curing coating slurry, comprising:

[0063] Take 5 parts of maleic anhydride grafted product, dissolve it in 100 parts of ethanol, and rotary evaporate to obtain rPVB-M fluid. The mixing ratio of the rPVB-M fluid and the HEA solution is 1:2. After the mixed solution is ultrasonically dispersed evenly, a photoinitiator system is added. The amount of photoinitiator CQ and co-initiator EDB added is 1.5%, and ultrasonic dispersion is performed again to obtain a coating slurry.

[0064] Step 3: Preparation of coated fabric, including:

[0065] Lay the base fabric flat and fix it, drop the coating slurry on the base fabric along the width direction, and use a scraper to apply it evenly along the length direction. The blue light irradiation time is 60s.

[0066] Example 4

[0067] Step 1: Preparation of maleic anhydride-modified rPVB grafts, comprising:

[0068] Take 4.5 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid, put them into a three-necked flask and stir evenly, heat to 60°C, connect a condenser, react for 6 hours until the color turns yellow and the reaction is complete, disperse it in distilled water, filter and dry it to obtain the grafted product rPVB-M.

[0069] Step 2: Preparation of maleic anhydride modified rPVB light-curing coating slurry, comprising:

[0070] Take 5 parts of maleic anhydride grafted product, dissolve it in 100 parts of ethanol, and rotary evaporate to obtain rPVB-M fluid. The mixing ratio of the rPVB-M fluid and the HEA solution is 1:2. After the mixed solution is ultrasonically dispersed evenly, a photoinitiator system is added. The amount of photoinitiator CQ and co-initiator EDB added is 1.5%, and ultrasonic dispersion is performed again to obtain a coating slurry.

[0071] Step 3: Preparation of coated fabric, including:

[0072] Lay the base fabric flat and fix it, drop the coating slurry on the base fabric along the width direction, and use a scraper to apply it evenly along the length direction. The blue light irradiation time is 60s.

[0073] Example 5

[0074] Step 1: Preparation of maleic anhydride-modified rPVB grafts, comprising:

[0075] Take 3 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid, put them into a three-necked flask and stir evenly, heat to 60°C, connect a condenser, react for 6 hours until the color turns yellow and the reaction is complete, disperse it in distilled water, filter and dry it to obtain the grafted product rPVB-M.

[0076] Step 2: Preparation of maleic anhydride modified rPVB light-curing coating slurry, comprising:

[0077] Take 5 parts of maleic anhydride grafted product, dissolve it in 100 parts of ethanol, and rotary evaporate to obtain rPVB-M fluid. The mixing ratio of the rPVB-M fluid and the HEA solution is 1:1. After the mixed solution is ultrasonically dispersed evenly, a photoinitiator system is added. The amount of photoinitiator CQ and co-initiator EDB added is 1.5%, and ultrasonic dispersion is performed again to obtain a coating slurry.

[0078] Step 3: Preparation of coated fabric, including:

[0079] Lay the base fabric flat and fix it, drop the coating slurry on the base fabric along the width direction, and use a scraper to apply it evenly along the length direction. The blue light irradiation time is 60s.

[0080] Example 6

[0081] Step 1: Preparation of maleic anhydride-modified rPVB grafts, comprising:

[0082] Take 3 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid, put them into a three-necked flask and stir evenly, heat to 60°C, connect a condenser, react for 6 hours until the color turns yellow and the reaction is complete, disperse it in distilled water, filter and dry it to obtain the grafted product rPVB-M.

[0083] Step 2: Preparation of maleic anhydride modified rPVB light-curing coating slurry, comprising:

[0084] Take 5 parts of maleic anhydride grafted product, dissolve it in 100 parts of ethanol, and rotary evaporate to obtain rPVB-M fluid. The mixing ratio of the rPVB-M fluid and the HEA solution is 1:2. After the mixed solution is ultrasonically dispersed evenly, a photoinitiator system is added. The amount of photoinitiator CQ and co-initiator EDB added is 1%, and ultrasonic dispersion is performed again to obtain a coating slurry.

[0085] Step 3: Preparation of coated fabric, including:

[0086] Lay the base fabric flat and fix it, drop the coating slurry on the base fabric along the width direction, and use a scraper to apply it evenly along the length direction. The blue light irradiation time is 60s.

[0087] Example 7

[0088] Step 1: Preparation of maleic anhydride-modified rPVB grafts, comprising:

[0089] Take 3 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid, put them into a three-necked flask and stir evenly, heat to 60°C, connect a condenser, react for 6 hours until the color turns yellow and the reaction is complete, disperse it in distilled water, filter and dry it to obtain the grafted product rPVB-M.

[0090] Step 2: Preparation of maleic anhydride modified rPVB light-curing coating slurry, comprising:

[0091] Take 5 parts of maleic anhydride grafted product, dissolve it in 100 parts of ethanol, and rotary evaporate to obtain rPVB-M fluid. The mixing ratio of the rPVB-M fluid and the HEA solution is 1:2. After the mixed solution is ultrasonically dispersed evenly, a photoinitiator system is added. The amount of photoinitiator CQ and co-initiator EDB added is 1.5%, and ultrasonic dispersion is performed again to obtain a coating slurry.

[0092] Step 3: Preparation of coated fabric, including:

[0093] Lay the base fabric flat and fix it, drop the coating slurry on the base fabric along the width direction, and use a scraper to apply it evenly along the length direction. The blue light irradiation time is 90s.

[0094] Example 8

[0095] The dry coating in step (3) of Examples 1 to 7 is completed on a scraping device, which includes a lower fixed platform 1, an upper movable frame 2 and a scraping assembly, which are combined to form the scraping device.

[0096] The lower fixed table 1 is used for laying the base cloth, and includes a base 11 and a table top 12. The upper end of the base 11 is connected to the table top 12, and the base cloth can be spread on the table top 12. After spreading the base cloth, it is necessary to fix the base cloth, otherwise it will shift, fold or fall during the coating process. Therefore, first guide rods 13 are set at the four corners of the base 11, which are connected to the upper movable frame 2 through the first guide rods 13. The upper movable frame 2 is movably connected to the first guide rods 13 and can move up and down along the first guide rods 13; cylinders 3 are installed on the outward extending portions on both sides of the base 11, and the cylinders 3 are arranged upward, and their piston rods are connected to the outward extending portions on both sides of the upper movable frame 2. The upper movable frame 2 is controlled to move up and down by the cylinders 3 to adjust the spacing between the upper movable frame 2 and the lower fixed table 1; a cloth pressing frame 21 is connected to the lower part of the front and rear ends of the upper movable frame 2, and the cloth pressing frame 21 moves up and down with the upper movable frame 2. The cloth pressing frame 21 includes connecting rods 211 on both sides and a pressing plate 212 connected between the connecting rods 211. The pressing plate 212 is in a U-shape with a downward opening, which matches the shape of the table top 12 and can completely press the base cloth spread on the table top 12.

[0097] The scraping assembly includes a transverse bracket 4 and a scraping knife 5 arranged on the transverse bracket 4. The transverse bracket 4 further includes a bracket 41 and a connecting bracket 42. The bracket 41 is arranged at the upper end, and the connecting bracket 42 is arranged at the lower end. The scraping knife 5 is connected to the lower end of the connecting bracket 42. After the above-mentioned cloth pressing bracket 21 is pressed, the scraping knife 5 is placed on the fabric, and the purpose of scraping the coating slurry to the base cloth can be achieved by moving the transverse bracket 4; the specific transverse structure is: transverse sliders 45 are provided on both sides of the bracket 41, and the left and right side rods of the upper movable frame 2 are provided with inward sliding grooves 22, and a transverse slide rail 221 is provided in the slide groove 22. The transverse slider 45 extends into the slide groove 22 and is connected to the transverse slide rail 221, so as to achieve the purpose of the transverse bracket 4 being able to slide back and forth.

[0098] A sizing assembly 43 is provided on the connecting frame 42. The sizing assembly 43 is used for sizing the base cloth and includes a sizing box 431 and an auxiliary sizing module 432. The sizing box 431 includes a vertical section and a pot mouth section extending outward. A sizing port 4311 is provided in the pot mouth section, and a sizing port 4312 is provided in the vertical section. The sizing port 4312 is passed through from top to bottom and is communicated with the sizing port 4311. The sizing port 4311 is connected to the middle section of the sizing port 4312, not to the upper end; a cover plate 4313 is provided at the lower end port of the sizing port 4312, one side of the cover plate 4313 is connected to the lower end port by an elastic hinge, and the other side of the cover plate 4313 is magnetically connected to the lower end port by a magnet. The auxiliary sizing module 432 pushes the coating slurry in the sizing port 4312 to sizing the base cloth from the lower end port. The sizing process of the sizing component 43 is as follows: the coating slurry is poured into the slurry pouring port 4311, and the coating slurry gradually flows into the slurry port 4312, while the cover plate 4313 at the lower end port position of the slurry port 4312 is tightly closed under the action of magnetic attraction, and the coating slurry cannot be slurried onto the base cloth; after the coating slurry is evenly mixed by itself, the auxiliary sizing module 432 is controlled to press down to apply a certain force to the cover plate 4313 through the coating slurry, and the cover plate 4313 is opened under the force, and the coating slurry is slurried onto the base cloth, and finally the auxiliary sizing module 432 is reset; repeat the above steps to slurry the base cloth multiple times.

[0099] The sizing auxiliary module 432 includes a push plate 4324, a push plate bracket 4323, a second guide rod 4322 and a control handle 4321. The push plate 4324 moves on the sizing port 4312, and matches with the sizing port 4312 to press down the coating slurry in the sizing port 4312; the upper end of the push plate 4324 is connected to the push plate bracket 4323, and the upper end of the push plate bracket 4323 is connected to the second guide rod 4322. The second guide rod 4322 passes upward through the connecting frame 42 and the bracket 41 and is connected to the control handle 4321, so that the researcher can push the slurry to the base cloth by controlling the control handle 4321.

[0100] In order to achieve the purpose of temporarily lifting the scraper 5, a locking assembly 44 is provided at both ends of the bracket 41. The locking assembly 44 includes a locking plate 441 and a handle 442. The locking plate 441 is movably connected to the bracket 41, and the handle 442 can pull the locking plate 441; and the specific movable connection structure of the locking plate 441 includes: the lower end of the locking plate 441 is connected to a locking slider 444, and the corresponding position of the bracket 41 is provided with a locking groove 411, and the locking slider 444 can slide in the locking groove 411, and the two match, and the locking slider 444 is connected to a spring rod 445, and the spring rod 445 is sleeved with a spring 446, and the corresponding position of the locking groove 411 A guide hole (not marked in the figure) is provided, and the spring rod 445 can be extended into the guide hole; the transverse slider 45 includes a connecting seat 46, which is connected to the bracket 41 through the connecting seat 46, and the connecting seat 46 is provided with a bayonet 461, and the bayonet 461 is for the end of the bracket 41 to be connected, and the height of the bayonet 461 is greater than the height of the bracket 41, so that the bracket 41 can move up and down a certain distance relative to the bayonet 461; the height of the greater part is consistent with the height of the locking plate 441, and the connecting seat 46 is provided with a limiting groove 462 inside and above the bayonet 461, and the locking plate 441 is provided with a limiting protrusion 443, and the limiting groove 462 and the limiting protrusion 443 match each other. The locking assembly 44 allows the bracket 41 to have two states: the first is the working state, in which the lower end of the bracket 41 is flush with the lower end of the latch 461, the locking plate 441 is inserted into the gap between the upper ends of the bracket 41 and the latch 461, and the limiting protrusion 443 is inserted into the limiting groove 462 in the latch 461; the second is the temporary lifting state, in which the locking plate 441 is pulled inward by the handle 442, and the bracket 41 is lifted at the same time, so that the upper end of the bracket 41 is flush with the upper end of the latch 461. The locking plate 441 is released, and the limiting protrusion 443 of the locking plate 441 is inserted into the limiting groove 462 above the latch 461, maintaining the temporary lifting state. In the temporary lifting state, scraping problems can be checked or corrected to improve scraping quality.

[0101] The scraping steps based on the upper scraping device include:

[0102] a. First, lay the base fabric flat on the lower fixed platform 1, start the cylinder 3 to control the upper movable frame 2 and the cloth pressing frame 21 to move downward until the base fabric is pressed tightly, and place the scraper 5 on the fabric;

[0103] b. The coating slurry is poured into the pouring port 4311 and gradually flows into the slurry application port 4312. However, the cover plate 4313 at the lower end of the slurry application port 4312 is tightly closed by magnetic attraction, and the coating slurry cannot be applied to the base fabric. After the coating slurry is evenly mixed, the auxiliary slurry application module 432 is controlled to press down and apply a certain force to the cover plate 4313 through the coating slurry. Under this force, the cover plate 4313 opens, and the coating slurry is applied to the base fabric. After the coating slurry is applied, the auxiliary slurry application module 432 is reset, and the cover plate 4313 re-seals the lower end port under the action of the rebound force.

[0104] c. The traverse bracket 4 drives the scraper 5 to move transversely to complete the scraping of the coating slurry on the base fabric;

[0105] d. After the current section is scraped and coated, the upper movable frame 2 and the transverse bracket 4 are reset, and the base cloth is moved forward until the next section to be scraped and coated enters the lower fixed platform 1, and the above steps ac are repeated to complete the scraping operation of the section to be scraped and coated; and the continuous scraping operation is completed by continuously repeating step b.

[0106] 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 based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are included within the scope of protection of the present invention.

Claims

1. A method for preparing a light-cured coated fabric based on waste polyvinyl butyral, characterized in that The method comprises the following steps: (1) preparation of maleic anhydride-modified rPVB grafted product: maleic anhydride and rPVB are dissolved in N,N-dimethylformamide, p-toluenesulfonic acid is used as a catalyst, the temperature is raised to fully react for several hours, the mixture is dispersed in distilled water, filtered and dried to obtain a filter cake, which is the rPVB grafted product rPVB-M; (2) Preparation of maleic anhydride modified rPVB photocurable coating slurry: the modified rPVB graft rPVB-M was dissolved in ethanol, and the solvent was evaporated to obtain rPVB-M fluid, the rPVB-M fluid was mixed with HEA solution, a photoinitiator system was added, and ultrasonic dispersion was performed to obtain a coating slurry; the mixing ratio of the rPVB-M fluid to the HEA solution was 1:(2~3); the photoinitiator system included a photoinitiator camphorquinone and a co-initiator 4-dimethylaminobenzoic acid ethyl ester, and the addition amount of both was 0.5~2.5%; (3) Preparation of coated fabric: Use a dry coating scraper to scrape the coating slurry onto the base fabric, and irradiate it with blue light for a period of time to obtain the coated fabric.

2. The method for preparing a light-cured coated fabric based on waste polyvinyl butyral according to claim 1, characterized in that: The step (1) comprises taking 1.5 to 6 parts of maleic anhydride, 6 parts of rPVB, 100 parts of DMF, and 0.6 parts of p-toluenesulfonic acid.

3. The method for preparing a light-cured coated fabric based on waste polyvinyl butyral according to claim 1, characterized in that: Step (1): heating to 40-80°C and reacting for 2-8 hours.

4. The method for preparing a light-cured coated fabric based on waste polyvinyl butyral according to claim 1, characterized in that: Said step (3): said dry coating is to lay the base fabric flat and fixed, drip the coating slurry onto the base fabric along the width direction, and use a scraper to evenly scrape along the length direction, and the blue light irradiation time is 60~120s.

5. The method for preparing a light-cured coated fabric based on waste polyvinyl butyral according to claim 1, characterized in that: The dry coating in step (3) is completed on a scraping device, which includes a lower fixed platform, an upper movable frame and a scraping assembly, the lower fixed platform is used to lay the base cloth, the lower fixed platform is connected to the upper movable frame through a first guide rod, the upper movable frame is connected to a cylinder, and its up and down movement is controlled by the cylinder, the lower end of the upper movable frame is connected to a cloth pressing frame, and the cloth pressing frame cooperates with the lower fixed platform to press the base cloth; the scraping assembly includes a transverse bracket and a scraping knife arranged on the transverse bracket, transverse sliders are provided on both sides of the transverse bracket, the upper movable frame is provided with a slide groove, a transverse slide rail is provided in the slide groove, and the transverse slider and the transverse slide rail match each other; the scraping step includes: a. First, lay the base fabric flat on the lower fixed platform, start the cylinder to control the upper movable frame and the cloth pressing frame to move downward until the base fabric is pressed tightly, and after the coating slurry is fed to the base fabric, the lateral movement bracket drives the scraper to move horizontally to complete the coating slurry scraping on the base fabric; b. After the scraping of the current section is completed, the upper movable frame and the transverse moving bracket are reset, and the base cloth is moved forward until the next section to be scraped enters the lower fixed platform, and the above step a is repeated to complete the scraping operation of the section to be scraped; and the continuous scraping operation is completed by continuously repeating step b.

6. The method for preparing a light-cured coated fabric based on waste polyvinyl butyral according to claim 5, characterized in that: The transverse moving bracket is provided with a sizing assembly, and the sizing assembly includes a sizing box and an auxiliary sizing module. The sizing box is provided with a back-sizing port and a sizing port. The back-sizing port is opened on the outside of the sizing box, and the sizing port passes through the sizing box up and down. The back-sizing port and the sizing port are connected to each other. A cover plate is provided at the lower end port of the sizing port, one side of the cover plate is connected to the lower end port by an elastic hinge, and the other side of the cover plate is magnetically connected to the lower end port by a magnet; the auxiliary sizing module pushes the slurry in the sizing port to sizing the base cloth from the lower end port.

7. The method for preparing a light-cured coated fabric based on waste polyvinyl butyral according to claim 6, characterized in that: The sizing assist module includes a push plate, a push plate bracket, a second guide rod and a control handle. The push plate moves at the sizing port. The push plate is connected to the push plate bracket. The second guide rod is connected between the push plates. The second guide rod passes through the transverse bracket and is connected to the control handle at the other end. The control handle is used to control the push plate to push down or move up to reset.

8. The method for preparing a light-cured coated fabric based on waste polyvinyl butyral according to claim 5, characterized in that: The cam is secured to the chassis and has a spring which allows the chassis to slide into the chassis, and the cam has a spring which allows the chassis to slide into the chassis, and the cam has a spring which allows the chassis to slide into the chassis, and the cam has a spring which allows the chassis to slide into the chassis, and the cam has a spring which allows the chassis to slide into the chassis, and the cam has a spring which allows the chassis to slide into the chassis, and the cam has a spring which allows the chassis to slide into the chassis, and the cam has a spring which allows the chassis to slide into the chassis, and the

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