Composite material textile packaging bag and composite process

Abstract

This invention relates to the technical field of textile packaging products, and in particular to a composite textile packaging bag and a composite process, comprising the following steps: S1, slurry preparation and homogenization: a bio-based polymer, plasticizer, modified nanofiller and solvent are mixed in proportion and placed in a stirring device for mixing and stirring to form a homogeneous functional composite slurry; S2, substrate pretreatment: a biodegradable textile substrate is provided and its surface is activated; S3, slurry coating; S4, gradient curing and composite: the substrate coated with slurry is sequentially passed through a first heating zone, a second heating zone and a third heating zone with gradient temperatures for stepwise drying, cross-linking curing and cooling, so that the functional composite slurry forms a dense barrier layer on the surface of the substrate, thereby obtaining the multifunctional biodegradable composite material; the substrate and slurry components used are biodegradable, improving environmental friendliness.

Description

Technical Field

[0001] This invention relates to the technical field of textile packaging products, and in particular to a composite material textile packaging bag and a composite process. Background Technology

[0002] Textile packaging bags are widely used in food, daily necessities, industrial auxiliary material packaging, and consumer products such as home storage and backpack manufacturing due to their lightweight, good toughness, foldability, and excellent portability. With the deepening of global environmental protection concepts and the upgrading of market demand for functional packaging, composite textile packaging bags with biodegradable, moisture-proof, and high-temperature resistant properties have become a key focus of industry research and development. Existing technologies have included research on the preparation of nanofiller-reinforced composite materials, such as the invention patent with authorization announcement number CN109808201B, which discloses a wear-resistant composite material reinforced with nano-gradient fibers. The preparation and molding method improves the wear resistance of composite materials through the gradient distribution of nanoparticles, providing a technical approach for the application of nanofillers in composite materials. However, this technology uses non-degradable rigid substrates such as glass fiber and carbon fiber, and is only suitable for the preparation of industrial wear-resistant parts. Its composite process is resin film melting and infiltration + vacuum hot pressing curing, which is complex and requires high-end equipment. Moreover, it only focuses on a single wear-resistant function and lacks a moisture-proof and high-temperature resistant barrier layer design. It cannot adapt to the processing requirements of flexible and degradable textile substrates, nor can it meet the environmental protection and multi-functional use requirements of textile packaging bags.

[0003] Currently, most biodegradable textile composite packaging bags developed in the industry are made by combining biodegradable textile substrates such as polylactic acid and hemp fiber with bio-based polymer coatings. While these methods achieve basic biodegradability, existing composite processes still have several technical shortcomings: First, the interfacial bonding between the bio-based polymer slurry and the biodegradable textile substrate is weak, making the coating prone to peeling and flaking, leading to a rapid decline in the moisture-proof barrier performance of the packaging bag. Second, the curing method is mostly single-temperature drying and curing, resulting in insufficient cross-linking of bio-based polymer segments and uneven dispersion of functional fillers in the slurry, making it difficult to form a dense barrier layer. This results in poor moisture resistance and high-temperature resistance of the composite material; thirdly, the process design does not take into account the thermal characteristics of biodegradable bio-based polymers, and improper control of curing temperature can easily lead to thermal deformation of the biodegradable substrate, damaging the mechanical properties of the substrate and affecting the overall strength of the textile packaging bag. At the same time, the existing manufacturing processes for biodegradable textile packaging bags mostly copy the traditional plastic composite film processing technology, without adapting to the flexibility and porosity of biodegradable textile substrates. The resulting products are difficult to balance biodegradability, moisture resistance, high-temperature resistance and the flexibility of the textile substrate itself, which limits their promotion and application in various fields.

[0004] In summary, in view of the deficiencies of the prior art, it has become an urgent technical problem in the field to develop a textile composite process with reasonable process design and adaptable to the characteristics of degradable textile substrates, which can synergistically improve degradability, moisture resistance, and high-temperature resistance, and the prepared composite material has a strong interfacial bonding force and a dense and stable barrier layer, as well as a high-performance composite material textile packaging bag prepared by using this process. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a composite material textile packaging bag and a composite process.

[0006] A textile composite process for a composite material of the present invention includes the following steps: S1. Slurry preparation and homogenization: Mix a bio-based polymer, a plasticizer, a modified nano filler, and a solvent in proportion, and place them in a stirring device for mixing and stirring to form a homogeneous functional composite slurry; S2. Substrate pretreatment: Provide a degradable textile substrate and perform surface activation treatment on it; S3. Slurry coating: Uniformly coat the functional composite slurry prepared in step S1 on the surface of the degradable textile substrate treated in step S2 with a predetermined coating amount; S4. Gradient curing and compounding: Make the substrate coated with the slurry sequentially pass through a first heating zone, a second heating zone, and a third heating zone with gradient temperatures for step-by-step drying, crosslinking curing, and cooling and shaping, so that the functional composite slurry forms a dense barrier layer on the surface of the substrate, thereby obtaining the multifunctional degradable composite material; through nano filler modification and slurry homogenization, a dense barrier layer is formed on the surface of the substrate, realizing the integration of multiple functions such as barrier and reinforcement. The gradient curing process enables the slurry to be dried and crosslinked step by step, has a high bonding strength with the substrate, a stable layer structure, and good durability; The used substrate and slurry components are degradable, improving environmental protection and being applicable to a variety of bio-based polymers and textile substrates, providing a general path for the development of diverse functional degradable materials.

[0007] Preferably, in step S4, the temperature of the first heating zone is T1 °C, so that the solvent slowly volatilizes to form a primary film; the temperature of the second heating zone is T2 °C, T2 > T1, so that the bio-based polymer chain segments move and undergo a crosslinking reaction, and at the same time, the modified nano filler is arranged in a direction in the barrier layer; the third heating zone is a cooling zone, and the temperature rapidly drops to T3 °C, T3 < T2, so that the barrier layer is shaped. The temperature T2 of the second heating zone is higher than the glass transition temperature of the bio-based polymer but lower than its heat deformation temperature; through the precise control of the gradient temperature field in this process, the step-by-step optimization of the composite slurry from film formation, crosslinking to shaping is realized, thereby efficiently preparing a degradable multifunctional composite material with a dense structure and excellent performance.

[0008] Preferably, the mixing device includes a support frame, a mixing tank, a controller, a feed pipe, a feed hopper, a feed valve, and a top cover. The support frame is installed on the outer wall of the mixing tank, the top cover is installed on the top of the mixing tank, the controller is installed on the outer wall of the mixing tank, the top of the top cover is connected to the output end of the feed pipe, the feed hopper is installed at the input end of the feed pipe, and the feed valve is installed on the feed pipe. It also includes: Vacuum assembly, which is mounted on the top cover, is used to evacuate the inside of the mixing tank. A stirring assembly, which is mounted on a vacuum assembly, is used to mix and stir materials. A pressure monitoring component, mounted on the top cover, is used to detect the negative pressure inside the mixing tank; The discharge assembly is installed at the bottom of the mixing tank for discharging the slurry. The vacuuming component, pressure monitoring component, and discharge component are all electrically connected to the controller. In use, the feed valve is opened, allowing the bio-based polymer, plasticizer, modified nanofiller, and solvent to be injected into the mixing tank in proportion through the feed hopper and feed pipe. The feed valve is then closed, and the vacuuming component is activated to create a vacuum inside the mixing tank. Simultaneously, the vacuuming component drives the mixing component to rotate forward, achieving mixing of the slurry. When a negative pressure is established inside the mixing tank, the pressure monitoring component detects that the negative pressure has reached a set threshold. At this point, the pressure monitoring component sends an electrical signal to the controller, which then controls the vacuuming component to stop mixing. The negative pressure extraction of the tank simultaneously drives the stirring component to stir in the opposite direction, achieving rapid mixing of the slurry. The vacuum component evacuates the inside of the mixing tank, achieving vacuum degassing of the slurry and creating a low-oxygen and bubble-free mixing environment inside the mixing tank. This eliminates gas in the slurry, prevents the formation of penetrating micropores after curing, improves the density of the composite barrier layer, reduces water vapor permeability, and enhances the product's moisture-proof performance. The vacuum environment isolates oxygen, preventing the thermo-oxidative degradation of bio-based polymers under high-speed mixing and stirring, maintaining the integrity of the molecular chain and controllable degradation characteristics. It also enhances the wetting and penetration of the slurry into the textile substrate, significantly strengthens the interlayer bonding force, and prevents the coating from peeling off.

[0009] Preferably, the vacuum assembly includes a support base, a reciprocating motor, an output shaft, a first coupling, a reciprocating screw, a threaded connecting block, a one-way bearing, a piston, a vertical rod, an inlet pipe, an inlet one-way valve, an outlet pipe, an outlet one-way valve, and a sealing cylinder. The support base is located at the top of the top cover, and the reciprocating motor is located at the top of the support base. An output shaft is located at the output end of the reciprocating motor. The bottom end of the output shaft is connected to the top end of the reciprocating screw via the first coupling. A sealing cylinder is located at the bottom of the top cover, and the bottom end of the reciprocating screw extends to the bottom end of the sealing cylinder. The reciprocating screw is rotatably connected to the top cover and the sealing cylinder. The threaded connecting block is threadedly connected to the reciprocating screw, and the outer wall of the threaded connecting block is fitted with... It features a one-way bearing with a piston fitted onto its outer wall. A vertical rod is mounted at the bottom of the top cover, with its bottom fixedly connected to the bottom of the inner part of the sealing cylinder. The rod and piston are slidably connected, and the outer wall of the piston is slidably sealed to the inner wall of the sealing cylinder. An air inlet pipe with a one-way valve is located on the outer wall of the sealing cylinder, and an air outlet pipe extending to the top cover. A one-way valve is also mounted on the outlet pipe. A stirring assembly is located at the bottom of the reciprocating screw. In operation, the controller starts the forward and reverse motors, causing them to rotate in the forward direction. This, in conjunction with the first coupling, drives the reciprocating screw to rotate in the forward direction. The one-way bearing is in a braking state, which keeps the threaded connecting block stationary due to the cooperation of the one-way bearing. Because the reciprocating screw is threadedly connected to the threaded connecting block, the threaded connecting block drives the one-way bearing and the piston to reciprocate up and down inside the sealed cylinder. When the piston moves from bottom to top inside the sealed cylinder, air from inside the mixing tank passes through the inlet one-way valve and the inlet pipe inside the sealed cylinder. When the piston moves from top to bottom inside the sealed cylinder, it forces the air inside the sealed cylinder to the outside through the outlet pipe. This cycle continues, thus causing the piston... The mixing tank is subjected to negative pressure, while the mixing component mixes the slurry in the forward direction. When the negative pressure inside the mixing tank is the same as that inside the sealing cylinder, the pressure monitoring component detects the negative pressure value and the controller operates the forward and reverse motors to rotate in the opposite direction. At this time, the threaded connecting block rotates relative to the piston with the cooperation of the one-way bearing, while the piston remains at a fixed height. Meanwhile, the reciprocating screw drives the mixing component to mix the slurry in the reverse direction. This achieves the effect of continuing to mix the slurry after the negative pressure inside the mixing tank is drawn, while avoiding frictional wear of the piston.

[0010] Preferably, the mixing assembly includes a second coupling, a mixing shaft, a first mixing blade, connecting rods, a bushing, and a second mixing blade. The top end of the mixing shaft is fixedly connected to the bottom end of the reciprocating screw via the second coupling. Multiple sets of first mixing blades are installed on the mixing shaft inside the mixing tank. Two sets of connecting rods are provided at the bottom end of the piston. The bottom ends of both sets of connecting rods extend to the bottom of the sealing cylinder and are fixedly connected to the top end of the bushing, respectively. The bushing is movably fitted on the outside of the mixing shaft. Multiple sets of second mixing blades are symmetrically arranged on the outer wall of the bushing. When the forward and reverse motors rotate in the forward direction, the reciprocating screw drives the mixing shaft to rotate in the forward direction via the second coupling, thereby causing the mixing shaft to drive the multiple sets of first mixing blades to rotate in the forward direction. This allows the multiple sets of first mixing blades to stir the slurry. At the same time, the piston drives the bushing and the second mixing blades to reciprocate up and down via the two sets of connecting rods. The dynamic and static combination of the second mixing blade and the first mixing blade achieves multi-directional mixing of the slurry, improving the uniformity of mixing.

[0011] Preferably, the pressure monitoring component includes a sealing cover, a first housing, a second housing, a photoelectric signal transmitter, a photoelectric signal receiver, and an airbag. The bottom end of the sealing cover is connected to the top end of the top cover. An airbag is installed at the top inside the sealing cover. A set of first housings and a set of second housings are symmetrically arranged on the outer wall of the sealing cover. The photoelectric signal transmitter is installed inside the first housing, and the photoelectric signal receiver is installed inside the second housing. Under normal pressure, the airbag is in a contracted state. The photoelectric signal receiver receives the photoelectric signal emitted by the photoelectric signal transmitter. The controller controls the forward and reverse motors to rotate in the forward direction. When the piston performs a negative pressure operation on the inside of the mixing tank, as the negative pressure value inside the mixing tank increases, the volume of the airbag increases. When the negative pressure inside the mixing tank reaches its maximum value, the volume of the airbag expands and blocks the photoelectric signal between the photoelectric signal transmitter and the photoelectric signal receiver, thereby causing the controller to control the forward and reverse motors to rotate in the reverse direction, improving the ease of operation.

[0012] Preferably, the discharge assembly includes a discharge pipe, a discharge valve, a discharge pump, and a conveying pipe. The discharge pump input end is provided with a discharge pipe, which is connected to the bottom end of the mixing tank. The discharge pipe is provided with a discharge valve, and the discharge pump output end is provided with a conveying pipe. After the slurry is mixed, the discharge valve is opened and the discharge pump is started, so that the mixed slurry is discharged and conveyed through the discharge pipe and the conveying pipe.

[0013] Preferably, it also includes a filter screen, and the output end of the air outlet pipe is provided with a filter screen; the filter screen provides safety protection for the output end of the air outlet pipe, preventing external impurities from entering the interior of the air outlet pipe through the output end of the air outlet pipe, thereby improving safety protection.

[0014] Preferably, it also includes a reinforcing frame, with reinforcing frames provided between the support frames; the reinforcing frame increases the strength of the support structure of the support frame and improves the stability of the support frame in supporting the mixing tank.

[0015] A composite material textile packaging bag is made using any of the composite processes described above.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: through the modification of nanofillers and the homogenization of slurry, a dense barrier layer is formed on the surface of the substrate, realizing the integration of multiple functions such as barrier and reinforcement. The gradient curing process enables the slurry to be dried and cross-linked step by step, resulting in high bonding strength with the substrate, stable interlayer structure, and good durability. The substrate and slurry components used are degradable, improving environmental protection. It is applicable to a variety of bio-based polymers and textile substrates, providing a general path for the development of diversified functional degradable materials. Attached Figure Description

[0017] Figure 1 This is a flowchart of the method of the present invention; Figure 2 This is an isometric structural diagram of the stirring device of the present invention; Figure 3 This is a cross-sectional structural schematic diagram of the stirring device of the present invention; Figure 4 yes Figure 3 A partially enlarged structural diagram of section A in the middle; Figure 5 This is an exploded structural diagram of the stirring device of the present invention; Figure 6 This is an enlarged structural diagram of the discharge pump and discharge valve, etc. Figure 7 This is an enlarged structural diagram of the forward and reverse motors and the second stirring blade, etc. Figure 8 yes Figure 7 A partially enlarged structural diagram of section B in the middle; Figure 9 This is an enlarged structural diagram of the sealing cylinder and connecting rod, etc. Figure 10 It is a cross-sectional structural diagram of the sealing cylinder and reciprocating lead screw, etc. Figure 11 This is an enlarged structural diagram of threaded connecting blocks and pistons.

[0018] In the attached diagram, the following components are labeled: 101, support frame; 102, mixing tank; 103, controller; 104, feed pipe; 105, feed hopper; 106, feed valve; 107, top cover; 108, reinforcing frame; 201, support base; 202, forward and reverse motor; 203, output shaft; 204, No. 1 coupling; 205, reciprocating screw; 206, threaded connecting block; 207, one-way bearing; 208, piston; 209, upright; 210, air inlet pipe; 211, air inlet check valve; 212, outlet... 213. Air pipe; 214. Air outlet check valve; 215. Sealing cylinder; 216. Filter screen; 301. No. 2 coupling; 302. Stirring shaft; 303. No. 1 stirring blade; 304. Connecting rod; 305. Shaft sleeve; 306. No. 2 stirring blade; 401. Sealing cover; 402. No. 1 housing; 403. No. 2 housing; 404. Photoelectric signal transmitter; 405. Photoelectric signal receiver; 406. Airbag; 501. Discharge pipe; 502. Discharge valve; 503. Discharge pump; 504. Conveying pipe. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0020] Example 1 like Figures 1 to 11 As shown, a composite material textile composite process of the present invention includes the following steps: S1. Slurry preparation and homogenization: Bio-based polymers, plasticizers, modified nanofillers and solvents are mixed in proportion and placed in a stirring device for mixing and stirring to form a homogeneous functional composite slurry; S2. Substrate pretreatment: Provide a biodegradable textile substrate and activate its surface; S3. Slurry coating: The functional composite slurry obtained in step S1 is uniformly coated onto the surface of the biodegradable textile substrate after step S2 with a predetermined coating amount. S4. Gradient curing and composite: The substrate coated with slurry is sequentially passed through a first heating zone, a second heating zone, and a third heating zone with gradient temperatures for stepwise drying, cross-linking curing, and cooling and shaping, so that the functional composite slurry forms a dense barrier layer on the surface of the substrate, thereby obtaining the multifunctional biodegradable composite material. In step S4, the temperature of the first heating zone is T1 °C, which causes the solvent to slowly volatilize, forming a primary film; the temperature of the second heating zone is T2 °C, where T2 > T1, which causes the bio-based polymer chain segments to move and undergo a cross-linking reaction. At the same time, the modified nano-fillers are arranged in an oriented manner in the barrier layer; the third heating zone is a cooling zone, and the temperature rapidly drops to T3 °C, where T3 < T2, to shape the barrier layer. The temperature T2 of the second heating zone is higher than the glass transition temperature of the bio-based polymer but lower than its heat deformation temperature; The stirring device includes a support frame 101, a stirring tank 102, a controller 103, a feed pipe 104, a feed hopper 105, a feed valve 106, and a top cover 107. The outer side wall of the stirring tank 102 is provided with the support frame 101, the top of the stirring tank 102 is provided with the top cover 107, the outer side wall of the stirring tank 102 is provided with the controller 103. The top end of the top cover 107 is connected to the output end of the feed pipe 104. The input end of the feed pipe 104 is provided with the feed hopper 105, and the feed valve 106 is arranged on the feed pipe 104. It further includes: A vacuum pumping component, which is installed on the top cover 107 and is used for performing a vacuum pumping operation on the interior of the stirring tank 102; A stirring component, which is installed on the vacuum pumping component and is used for mixing and stirring the materials; A pressure monitoring component, which is installed on the top cover 107 and is used for detecting the negative pressure condition inside the stirring tank 102; A discharging component, which is installed at the bottom end of the stirring tank 102 and is used for discharging the slurry; Among them, the vacuum pumping component, the pressure monitoring component, and the discharging component are all electrically connected to the controller 103; The vacuum assembly includes a support base 201, a reciprocating motor 202, an output shaft 203, a first coupling 204, a reciprocating lead screw 205, a threaded connecting block 206, a one-way bearing 207, a piston 208, a vertical rod 209, an inlet pipe 210, an inlet one-way valve 211, an outlet pipe 212, an outlet one-way valve 213, and a sealing cylinder 214. The support base 201 is located at the top of the top cover 107, and the reciprocating motor 202 is located at the top of the support base 201. An output shaft 203 is located at the output end of the reciprocating motor 202. The bottom end of the output shaft 203 is connected to the top end of the reciprocating lead screw 205 via the first coupling 204. The sealing cylinder 214 is located at the bottom end of the top cover 107. The end extends to the bottom of the sealing cylinder 214. The reciprocating screw 205 is rotatably connected to the top cover 107 and the sealing cylinder 214. The threaded connecting block 206 is threadedly connected to the reciprocating screw 205. A one-way bearing 207 is fitted on the outer wall of the threaded connecting block 206. A piston 208 is fitted on the outer wall of the one-way bearing 207. A vertical rod 209 is provided at the bottom of the top cover 107. The bottom of the vertical rod 209 is fixedly connected to the bottom of the inner end of the sealing cylinder 214. The vertical rod 209 is slidably connected to the piston 208. The outer wall of the piston 208 is slidably sealed to the inner wall of the sealing cylinder 214. An air inlet pipe 210 is provided on the outer wall of the sealing cylinder 214. An air inlet one-way valve 211 is provided on the air inlet pipe 210. The outer wall of the sealing cylinder 214; The stirring assembly includes a second coupling 301, a stirring shaft 302, a first stirring blade 303, a connecting rod 304, a bushing 305, and a second stirring blade 306. The top end of the stirring shaft 302 is fixedly connected to the bottom end of the reciprocating screw 205 via the second coupling 301. Multiple sets of first stirring blades 303 are installed on the stirring shaft 302 inside the stirring tank 102. Two sets of connecting rods 304 are provided at the bottom end of the piston 208. The bottom ends of both sets of connecting rods 304 extend to below the sealing cylinder 214 and are respectively fixedly connected to the top end of the bushing 305. The 05 movable set is located outside the stirring shaft 302, and multiple sets of second stirring blades 306 are symmetrically arranged on the outer wall of the shaft sleeve 305; the bio-based polymer is selected from at least one of polylactic acid, polyhydroxyalkanoate, and polybutylene succinate; the modified nanofiller is nano-silica or nano-montmorillonite modified with silane coupling agent; in step S2, the activation treatment is low-temperature plasma treatment or ultraviolet grafting treatment; the biodegradable textile substrate is polylactic acid nonwoven fabric, hemp fiber woven fabric, or a blend of Tencel fiber and cotton.

[0021] In this embodiment, the controller 103 starts the forward and reverse motor 202 to rotate in the forward direction, thereby causing the output shaft 203 to drive the reciprocating screw 205 to rotate in the forward direction with the cooperation of the coupling 204. One-way bearing 207 is in a braking state, which keeps piston 208 stationary with the cooperation of one-way bearing 207 and threaded connecting block 206. Since reciprocating screw 205 is threadedly connected to threaded connecting block 206, threaded connecting block 206 drives one-way bearing 207 and piston 208 to reciprocate up and down inside sealing cylinder 214. When piston 208 moves from bottom to top inside sealing cylinder 214, air inside mixing tank 102 passes through air inlet one-way valve 211 and through air inlet pipe 210 inside sealing cylinder 214. When piston 208 moves from top to bottom inside sealing cylinder 214, piston 208 squeezes the air inside sealing cylinder 214 to the outside through air outlet pipe 212. This cycle continues, so that piston 208 performs negative pressure operation inside mixing tank 102, while multiple sets of No. 1 stirring blades 303 perform positive mixing of slurry. When mixing tank 102 When the internal negative pressure is the same as the negative pressure inside the sealing cylinder 214, the pressure monitoring component detects the negative pressure value and the controller 103 operates the forward and reverse motor 202 to rotate in the opposite direction. At this time, the threaded connecting block 206 rotates relative to the piston 208 with the cooperation of the one-way bearing 207. Meanwhile, the piston 208 maintains a fixed height, and the reciprocating screw 205 drives multiple sets of first stirring blades 303 to mix and stir the slurry in the opposite direction. This achieves the goal of drawing negative pressure from the inside of the mixing tank 102 and continuing to mix and stir the slurry while avoiding frictional wear of the piston 208. Through nanofiller modification and slurry homogenization, a dense barrier layer is formed on the surface of the substrate, realizing the integration of multiple functions such as barrier and reinforcement. The gradient curing process allows the slurry to dry and crosslink step by step, resulting in high bonding strength with the substrate, stable interlayer structure, and good durability. The substrate and slurry components used are biodegradable, improving environmental protection and making it suitable for various bio-based polymers and textile substrates.

[0022] Example 2 like Figures 1 to 11 As shown, based on Example 1, the present invention provides a composite material textile composite process. The pressure monitoring component includes a sealing cover 401, a first housing 402, a second housing 403, a photoelectric signal transmitter 404, a photoelectric signal transmitter and receiver 405, and an airbag 406. The bottom end of the sealing cover 401 is connected to the top end of the top cover 107. An airbag 406 is provided at the top inside the sealing cover 401. A set of first housings 402 and a set of second housings 403 are symmetrically arranged on the outer wall of the sealing cover 401. The photoelectric signal transmitter 404 is provided inside the first housing 402, and the photoelectric signal transmitter and receiver 405 is provided inside the second housing 403. The discharge assembly includes a discharge pipe 501, a discharge valve 502, a discharge pump 503, and a conveying pipe 504. The discharge pump 503 is equipped with a discharge pipe 501 at its input end, and the input end of the discharge pipe 501 is connected to the bottom end of the mixing tank 102. The discharge pipe 501 is equipped with a discharge valve 502, and the discharge pump 503 is equipped with a conveying pipe 504 at its output end. It also includes a filter screen 215, and the output end of the air outlet pipe 212 is provided with a filter screen 215; It also includes a reinforcing frame 108, which is provided between the support frames 101.

[0023] In this embodiment, under normal pressure, the airbag 406 is in a contracted state. The photoelectric signal transmitter / receiver 405 receives the photoelectric signal emitted by the photoelectric signal transmitter 404. The controller 103 controls the forward and reverse motor 202 to rotate in the forward direction. When the piston 208 performs a negative pressure extraction operation on the inside of the mixing tank 102, as the negative pressure value inside the mixing tank 102 increases, the volume of the airbag 406 increases. When the negative pressure inside the mixing tank 102 reaches its maximum value, the volume of the airbag 406 expands and transmits photoelectric signals between the photoelectric signal transmitter 404 and the photoelectric signal transmitter / receiver 405. The shielding causes the controller 103 to control the forward and reverse motors 202 to rotate in opposite directions. After the slurry is stirred, the discharge valve 502 is opened and the discharge pump 503 is started, so that the stirred slurry is discharged and transported through the discharge pipe 501 and the conveying pipe 504. The filter screen 215 provides safety protection for the output end of the air outlet pipe 212, preventing external impurities from entering the interior of the air outlet pipe 212 through the output end of the air outlet pipe 212, thereby improving safety protection. The reinforcing frame 108 increases the strength of the support structure of the support frame 101 and improves the stability of the support frame 101 in supporting the mixing tank 102.

[0024] Example 3 like Figures 1 to 11 As shown, a composite textile packaging bag of the present invention is manufactured using the above-described composite process, comprising at least two composite structural layers, from the outside to the inside: a biodegradable textile outer layer; a bio-based barrier middle layer; and a contactable inner layer; the biodegradable textile outer layer is made of polylactic acid fiber, hemp fiber, cotton fiber, or a blend thereof; the bio-based barrier middle layer comprises a bio-based polymer matrix and modified nanofillers uniformly dispersed therein, wherein the bio-based polymer is selected from at least one of polylactic acid, polyhydroxyalkanoates, and polybutylene succinate; the packaging bag simultaneously meets the following performance indicators: according to ISO 14855-1:2012 standard, its biodegradability under controlled composting conditions within 180 days is not less than 90%; according to GB / T 1037-2021 standard, its water vapor transmission rate is not higher than 10 g / (m²). 2 •24h); According to GB / T 17391-1998 standard, its Vicat softening temperature is not lower than 80℃.

[0025] The main functions achieved by this invention are: 1. The innovative "gradient curing" technique uses a temperature (T2) positioned between the glass transition temperature and heat distortion temperature of the bio-based polymer, achieving three benefits in one go: it allows for full cross-linking of molecular chains, drives the directional arrangement of nanofillers to improve performance, and strictly prevents the heat-sensitive substrate from being damaged by heat. This is not a routine operation; it is a precise design targeting the weaknesses of the material. 2. The two usually separate tasks of "stirring" and "vacuuming" are combined into one "liftable hollow spindle with one-way bearing 207"; Forward rotation: the spindle rotates and rises, and the piston 208 draws a vacuum; Reverse rotation: the piston is "suspended" by the mechanical structure to maintain pressure (zero friction), and the spindle reverses alone to enhance stirring; 3. Using an "airbag optical switch" as an automatic trigger, when the set negative pressure is reached in the mixing tank 102, the airbag 406 is squeezed by atmospheric pressure, blocking the light path, and the signal automatically commands the motor to reverse. It is a purely physical control, which is more reliable and cheaper than electronic sensors.

[0026] The composite material textile packaging bag and composite process of the present invention are all common mechanical methods in terms of installation, connection or setting. Any method that can achieve its beneficial effect can be implemented. The reciprocating screw 205 is sealed to the top cover 107 and the sealing cylinder 214 by mechanical seals. The controller 103, forward and reverse motor 202, reciprocating screw 205, piston 208, one-way bearing 207, photoelectric signal transmitter 404, photoelectric signal receiver 405 and discharge pump 503 of the composite material textile packaging bag and composite process of the present invention are commercially available. Technical personnel in the industry only need to install and operate them according to the accompanying instruction manual, without requiring creative labor from those skilled in the art.

[0027] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A composite material textile composite process, characterized in that, It includes the following steps: S1. Slurry preparation and homogenization: Mix a biobased polymer, a plasticizer, a modified nano filler, and a solvent in proportion, and place them in a stirring device for mixing and stirring to form a homogeneous functional composite slurry; S2. Substrate pretreatment: Provide a degradable textile substrate and perform surface activation treatment on it; S3. Slurry coating: Uniformly coat the functional composite slurry obtained in step S1 on the surface of the degradable textile substrate treated in step S2 at a predetermined coating amount; S4. Gradient curing and compounding: Make the substrate coated with the slurry sequentially pass through a first heating zone, a second heating zone, and a third heating zone with gradient temperatures for step-by-step drying, crosslinking curing, and cooling shaping, so that the functional composite slurry forms a dense barrier layer on the surface of the substrate, thereby obtaining the multifunctional degradable composite material.

2. The composite material textile composite process as described in claim 1, characterized in that, In step S4, the temperature of the first heating zone is T1 °C to slowly volatilize the solvent to form a primary film; the temperature of the second heating zone is T2 °C, T2 > T1, to make the biobased polymer chain segments move and undergo a crosslinking reaction, and at the same time, the modified nano filler is arranged directionally in the barrier layer; the third heating zone is a cooling zone, and the temperature rapidly drops to T3 °C, T3 < T2, to shape the barrier layer. The temperature T2 of the second heating zone is higher than the glass transition temperature of the biobased polymer but lower than its heat distortion temperature.

3. The composite material textile composite process as described in claim 1, characterized in that, The stirring device includes a support frame (101), a stirring tank (102), a controller (103), a feed pipe (104), a feed hopper (105), a feed valve (106), and a top cover (107). A support frame (101) is arranged on the outer side wall of the stirring tank (102), a top cover (107) is arranged at the top of the stirring tank (102), a controller (103) is arranged on the outer side wall of the stirring tank (102), the output end of the feed pipe (104) is connected to the top of the top cover (107), a feed hopper (105) is arranged at the input end of the feed pipe (104), a feed valve (106) is arranged on the feed pipe (104), and it further includes: A vacuum pumping component, which is installed on the top cover (107) and is used for performing a vacuum pumping operation on the inside of the stirring tank (102); A stirring component, which is installed on the vacuum pumping component and is used for mixing and stirring the materials; A pressure monitoring component, which is installed on the top cover (107) and is used for detecting the negative pressure condition inside the stirring tank (102); A discharging component, which is installed at the bottom end of the stirring tank (102) and is used for discharging the slurry; Among them, the vacuum pumping component, the pressure monitoring component, and the discharging component are all electrically connected to the controller (103).

4. The composite material textile composite process as described in claim 3, characterized in that, The vacuum assembly includes a support base (201), a forward and reverse motor (202), an output shaft (203), a first coupling (204), a reciprocating lead screw (205), a threaded connecting block (206), a one-way bearing (207), a piston (208), a vertical rod (209), an inlet pipe (210), an inlet one-way valve (211), an outlet pipe (212), an outlet one-way valve (213), and a sealing cylinder (214). A support base is provided at the top of the top cover (107). 201), a forward and reverse motor (202) is provided at the top of the support base (201), and an output shaft (203) is provided at the output end of the forward and reverse motor (202). The bottom end of the output shaft (203) is connected to the top end of the reciprocating screw (205) through a No. 1 coupling (204). A sealing cylinder (214) is provided at the bottom end of the top cover (107). The bottom end of the reciprocating screw (205) extends to the bottom end of the sealing cylinder (214). The reciprocating screw (205) is connected to the top cover (107) and the sealing cylinder. (214) Rotary connection, threaded connecting block (206) is threadedly connected to reciprocating screw (205), one-way bearing (207) is fitted on the outer wall of threaded connecting block (206), piston (208) is fitted on the outer wall of one-way bearing (207), upright rod (209) is provided at the bottom of top cover (107), the bottom of upright rod (209) is fixedly connected to the bottom of the inner part of sealing cylinder (214), upright rod (209) is slidably connected to piston (208), piston (208) The outer wall is slidably sealed to the inner wall of the sealing cylinder (214). An air inlet pipe (210) is provided on the outer wall of the sealing cylinder (214). An air inlet check valve (211) is provided on the air inlet pipe (210). An air outlet pipe (212) is provided on the outer wall of the sealing cylinder (214). The output end of the air outlet pipe (212) extends to the top cover (107). An air outlet check valve (213) is provided on the air outlet pipe (212). A stirring assembly is provided at the bottom of the reciprocating screw (205).

5. The composite material textile composite process as described in claim 4, characterized in that, The stirring assembly includes a second coupling (301), a stirring shaft (302), a first stirring blade (303), a connecting rod (304), a bushing (305), and a second stirring blade (306). The top end of the stirring shaft (302) is fixedly connected to the bottom end of the reciprocating screw (205) through the second coupling (301). Multiple sets of first stirring blades (303) are installed on the stirring shaft (302) inside the stirring tank (102). Two sets of connecting rods (304) are provided at the bottom end of the piston (208). The bottom ends of the two sets of connecting rods (304) extend to the bottom of the sealing cylinder (214) and are fixedly connected to the top end of the bushing (305). The bushing (305) is movably fitted on the outside of the stirring shaft (302). Multiple sets of second stirring blades (306) are symmetrically arranged on the outer wall of the bushing (305).

6. The composite material textile composite process as described in claim 3, characterized in that, The pressure monitoring assembly includes a sealing cover (401), a first housing (402), a second housing (403), a photoelectric signal transmitter (404), a photoelectric signal transmitter and receiver (405), and an airbag (406). The bottom of the sealing cover (401) is connected to the top of the top cover (107). An airbag (406) is provided at the top inside the sealing cover (401). A set of first housings (402) and a set of second housings (403) are symmetrically arranged on the outer side wall of the sealing cover (401). A photoelectric signal transmitter (404) is provided inside the first housing (402), and a photoelectric signal transmitter and receiver (405) is provided inside the second housing (403).

7. The composite material textile composite process as described in claim 3, characterized in that, The discharge assembly includes a discharge pipe (501), a discharge valve (502), a discharge pump (503), and a conveying pipe (504). The discharge pump (503) has a discharge pipe (501) at its input end, which is connected to the bottom of the mixing tank (102). The discharge pipe (501) has a discharge valve (502) on it, and the discharge pump (503) has a conveying pipe (504) at its output end.

8. The composite material textile composite process as described in claim 4, characterized in that, It also includes a filter screen (215), and the output end of the air outlet pipe (212) is provided with a filter screen (215).

9. The composite material textile composite process as described in claim 3, characterized in that, It also includes a reinforcing frame (108), and the reinforcing frame (108) is provided between the support frames (101).

10. A composite material textile packaging bag, characterized in that, It is manufactured using the composite process described in any one of claims 1-9.

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