Flax fiber supercritical carbon dioxide anti-ultraviolet finishing device and finishing method

Abstract

The present application relates to a kind of flax fiber supercritical carbon dioxide anti-ultraviolet finishing device, comprising: carbon dioxide gas cylinder, filter, refrigerator, high-pressure pump, preheater, mixer, circulating pump, separation kettle and control system;It is also provided with anti-ultraviolet finishing kettle.The beneficial effects of the present application are: in the finishing process, anti-ultraviolet finishing agent enters finishing kettle from the spray hole on the inner cylinder of finishing kettle, and the flax fiber is subjected to anti-ultraviolet finishing, the penetration of anti-ultraviolet finishing agent is enhanced by the action of bottom agitator, and the uniformity of anti-ultraviolet finishing is improved.Anti-ultraviolet finishing whole process energy saving and emission reduction, zero pollution to the environment;The flax fiber supercritical carbon dioxide anti-ultraviolet finishing device and finishing method designed by the present application can actively promote the anti-ultraviolet finishing of flax fiber;The protective coefficient of flax fiber after anti-ultraviolet finishing by the method of the present application can reach more than 50.

Description

Technical Field

[0001] This invention belongs to the field of UV-resistant finishing technology for flax fiber fabrics, and particularly relates to a supercritical carbon dioxide UV-resistant finishing device and method for flax fibers. Background Technology

[0002] Flax (scientific name: *Linum usitatissimum*) is one of the earliest high-quality plant fibers used by humankind, accounting for 1.5% of the total natural fiber. The chemical composition of flax fiber mainly includes cellulose, hemicellulose, lignin, pectin, and waxes. Specifically, it contains 70%–80% cellulose, 12%–15% hemicellulose, 2.5%–5% lignin, 1.4%–5.7% pectin, 1.2%–1.8% waxes, and 0.3%–0.6% nitrogenous substances. With the gradual depletion of petroleum resources, flax, with its excellent moisture absorption and quick-drying properties, breathability and smoothness, antibacterial and health-promoting effects, acid and alkali resistance, and corrosion resistance, along with its unique style characterized by good hygiene and health benefits, breathability, smoothness, ruggedness, boldness, natural texture, soft colors, and crispness, is increasingly valued and widely used in textiles, clothing, home decoration, aerospace, medical and health fields, and many other areas.

[0003] Traditional UV-resistant finishing methods for flax fibers often involve using UV absorbers or UV shielders to finish the fabric. After finishing, the UV absorbers on the fabric can reflect or absorb UV rays and exchange energy, releasing or consuming the energy as heat or other harmless low-energy radiation. This reduces the absorption of UV rays by the dyes on the fabric and avoids photochemical reactions.

[0004] However, traditional UV-resistant finishing methods have problems such as long process flow and complex process, which affect the breathability, hand feel, whiteness and washability of fiber fabrics. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device and method for supercritical carbon dioxide anti-ultraviolet finishing of flax fibers.

[0006] This supercritical carbon dioxide UV-resistant finishing device for flax fibers includes: a carbon dioxide cylinder, a filter, a cooler, a high-pressure pump, a preheater, a mixer, a circulating pump, a separator, and a control system; it also includes a UV-resistant finishing vessel.

[0007] The carbon dioxide cylinder is connected to the filter, cooler, high-pressure pump, preheater, mixer, UV-resistant finishing vessel, circulating pump, and separator; the control system is electrically connected to the carbon dioxide cylinder, filter, cooler, high-pressure pump, preheater, mixer, circulating pump, and separator; the agitator and rotating device are both electrically connected to the control system; the control system is used to control the start and stop of the carbon dioxide cylinder, filter, cooler, high-pressure pump, preheater, mixer, UV-resistant finishing vessel, circulating pump, separator, agitator, and rotating device.

[0008] The UV-resistant finishing autoclave contains an inner cylinder, a stirrer, a hollow base, and a rotating device. The rotating device is mounted on the hollow base, and the inner cylinder is fixedly mounted on the rotating device. The rotating device drives the inner cylinder to rotate. The stirrer is located at the bottom of the inner cylinder, agitating the flax fibers and UV-resistant finishing agent within the cylinder. This enhances the permeability of the UV-resistant finishing agent and improves the uniformity of the UV-resistant finishing process. The stirrer has several holes with a diameter of 0.5–10 mm to facilitate the flow of the finishing agent into the channels, forming an internal circulation. Multiple spray holes are evenly distributed on the side wall of the inner cylinder for spraying the UV-resistant finishing agent into the cylinder. There is a certain distance between the bottom of the UV-resistant finishing autoclave and the bottom of the inner cylinder. The space between the bottom of the UV-resistant finishing autoclave, the hollow base, and the inner cylinder forms a channel for the UV-resistant finishing agent, which connects to the finishing agent inlet.

[0009] Preferably, the base is a hollow ring, with one end connected to the bottom of the inner cylinder of the finishing vessel and the other end connected to the bottom of the UV-resistant finishing vessel.

[0010] As a preferred option, the number of spray holes on the side wall of the inner cylinder of the finishing vessel is 10 to 100, and the hole diameter is 1 to 10 mm.

[0011] Preferably, a hollow lifting spray bar is also provided in the space between the bottom of the UV-resistant finishing vessel, the hollow base, and the inner cylinder of the finishing vessel. The spray outlet of the hollow lifting spray bar is directly opposite the spray hole of the inner cylinder of the finishing vessel, and the liquid inlet end of the hollow lifting spray bar is connected to the finishing agent inlet.

[0012] This method for treating flax fiber fabrics with UV protection using a supercritical carbon dioxide UV-resistant finishing device includes the following steps:

[0013] 0.5–100 g of UV absorber nano-TiO2 was mixed with 1–100 g / L ethanol to obtain a dispersion solution; then 1–100 g / L glyoxal, 1–100 g / L polyethylene glycol, 1–50 g / L sodium dodecyl sulfate and 1–50 g / L organosilicon were added to the dispersion solution to obtain a UV-resistant finishing mixture.

[0014] The obtained UV-resistant finishing mixture is placed into the finishing agent reactor. The refrigerator is turned on, the carbon dioxide cylinder is opened, and the high-pressure pump and preheater are turned on. Carbon dioxide is introduced into the finishing agent reactor at a flow rate of 5-10 g / min. The UV-resistant finishing mixture and carbon dioxide are mixed at a temperature of 35-60℃ and a pressure of 8-18 MPa for 5-30 min. The UV-resistant finishing mixture reaches the supercritical state under the action of supercritical carbon dioxide, and a supercritical mixed fluid is obtained.

[0015] 2–10 kg of flax fiber is placed in an anti-UV finishing vessel. A supercritical mixed fluid is added to the vessel. Carbon dioxide is introduced at a flow rate of 5–30 g / min under a temperature of 35–120℃ and a pressure of 8–30 MPa. Part of the fluid enters the hollow lifting spray bar and is sprayed out through the spray outlet. It then enters the finishing vessel through the spray holes on the inner cylinder surface. A rotating device drives the finishing vessel to rotate, performing multi-directional anti-UV finishing on the flax fiber for 20–150 minutes. Simultaneously, part of the anti-UV finishing mixture enters the channel through the holes on the agitator and mixes with another part of the fluid. It then re-enters the finishing vessel through the spray holes on the inner cylinder surface, completing the internal circulation finishing process. Part of the anti-UV finishing mixture flows out from the anti-UV finishing mixture outlet, passes through a separation vessel, an external circulation pipeline, a high-pressure pump, a preheater mixer, and then enters the finishing vessel, completing the external circulation finishing process.

[0016] After the flax fibers have undergone UV-resistant treatment in the UV-resistant finishing autoclave, they are washed for 10-30 minutes at a temperature of 35-40°C and a pressure of 8-10 MPa under a carbon dioxide atmosphere to remove excess UV-resistant finishing agent and improve the UV resistance of the treated flax fibers.

[0017] After the UV-resistant finishing process is completed, the UV-resistant finishing mixture is separated and recovered.

[0018] The beneficial effects of this invention are as follows: In the finishing process, the UV-resistant finishing agent enters the finishing kettle through a spray hole on the inner cylinder of the finishing kettle to perform UV-resistant finishing on the flax fibers. The bottom stirrer enhances the penetration of the UV-resistant finishing agent and improves the uniformity of the UV-resistant finishing. The entire UV-resistant finishing process is energy-saving and emission-reducing, with zero environmental pollution. The supercritical carbon dioxide UV-resistant finishing device and method for flax fibers designed in this invention can play a positive role in promoting UV-resistant finishing of flax fibers. The UV protection factor (UPF) of flax fibers treated with the method of this invention can reach over 50. Attached Figure Description

[0019] Figure 1 Schematic diagram of the structure of the UV-resistant finishing vessel;

[0020] Figure 2 Flowchart of the supercritical carbon dioxide UV-resistant finishing method for flax fibers.

[0021] Explanation of reference numerals in the attached drawings: 1. Finishing agent inlet; 2. Rotating device; 3. Base; 4. Stirrer; 5. Spray nozzle; 6. Inner cylinder of finishing vessel; 7. UV-resistant finishing vessel; 8. Carbon dioxide cylinder; 9. Filter; 10. Refrigerator; 11. High-pressure pump; 12. Preheater; 13. Finishing agent vessel; 14. Mixer; 15. Circulating pump; 16. Separator; 17. Hollow lifting spray bar. Detailed Implementation

[0022] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0023] Example 1

[0024] like Figure 1 As shown, a supercritical carbon dioxide UV-resistant finishing device for flax fibers includes: a carbon dioxide cylinder, a filter, a cooler, a high-pressure pump, a preheater, a mixer, a circulating pump, a separator, and a control system; it also includes a UV-resistant finishing vessel 7; the carbon dioxide cylinder is connected to the filter, cooler, high-pressure pump, preheater, mixer, UV-resistant finishing vessel, circulating pump, and separator; the control system is electrically connected to the carbon dioxide cylinder, filter, cooler, high-pressure pump, preheater, mixer, circulating pump, and separator; the stirrer 4 and the rotating device 2 are both electrically connected to the control system; the control system is used to control the start and stop of the carbon dioxide cylinder, filter, cooler, high-pressure pump, preheater, mixer, UV-resistant finishing vessel, circulating pump, separator, stirrer 4, and rotating device 2;

[0025] The UV-resistant finishing autoclave 7 contains an inner cylinder 6, a stirrer 4, a hollow annular base 3, and a rotating device 2. The rotating device 2 is mounted on the hollow annular base 3, and the inner cylinder 6 is fixedly mounted on the rotating device 2. The rotating device 2 drives the inner cylinder 6 to rotate. The bottom of the inner cylinder 6 is equipped with the stirrer 4, which agitates the flax fibers and UV-resistant finishing agent within the inner cylinder, enhancing the permeability of the UV-resistant finishing agent and improving the uniformity of the UV-resistant finishing process. The stirrer has several holes with a diameter of 0.5–10 mm to facilitate the flow of the finishing agent into the channels, forming an internal circulation. Multiple spray nozzles are evenly distributed on the side wall of the inner cylinder 6. Hole 5 is used to spray the UV-resistant finishing agent into the inner cylinder of the finishing kettle. There are 10 to 100 holes 5, and the diameter of the holes is 1 to 10 mm. The holes 5 are also equipped with corresponding hollow lifting spray rods. The outlet of the hollow lifting spray rods is directly opposite the inlet of the holes 5 on the side wall of the inner cylinder of the finishing kettle. There is a certain distance between the bottom of the UV-resistant finishing kettle 7 and the bottom of the inner cylinder 6 of the finishing kettle. The space between the bottom of the UV-resistant finishing kettle 7, the hollow annular base 3 and the inner cylinder 6 of the finishing kettle forms a channel for the UV-resistant finishing agent. The channel for the UV-resistant finishing agent is connected to the finishing agent inlet 1. One end of the hollow annular base 3 is connected to the bottom of the inner cylinder 6 of the finishing kettle, and the other end is connected to the bottom of the UV-resistant finishing kettle 7.

[0026] A hollow lifting spray bar 17 is also provided in the space between the bottom of the UV-resistant finishing vessel 7, the hollow base 3, and the inner cylinder 6 of the finishing vessel. The spray outlet of the hollow lifting spray bar 17 is directly opposite the spray hole 5 of the inner cylinder of the finishing vessel, and the liquid inlet end of the hollow lifting spray bar 17 is connected to the finishing agent inlet 1.

[0027] Example 2

[0028] 2g of nano-TiO2, an anti-UV absorber, was mixed with 10g / L of ethanol to obtain a certain amount of dispersion solution. Then, 10g / L of glyoxal, 20g / L of polyethylene glycol, 5g / L of sodium dodecyl sulfate, and 5g / L of organosilicon were added to obtain a mixture of anti-UV finishing agents.

[0029] 5 kg of flax fiber was placed in an anti-UV finishing vessel, and 100 ml of anti-UV agent mixture was added to the vessel. The refrigerator, carbon dioxide cylinder, high-pressure pump, and preheater were turned on. The carbon dioxide and anti-UV finishing agent mixture were uniformly mixed in the mixer. After pressurization and heating, it reached a supercritical state at a pressure of 15 MPa and a temperature of 50°C. The supercritical mixed fluid entered the anti-UV finishing vessel through the nozzles on the inner cylinder surface. Part of the fluid entered the hollow lifting spray bar and was sprayed out from the nozzle outlet. At the same time, part of the anti-UV finishing mixture entered the channel through the holes on the stirrer and mixed with another part of the fluid. It then entered the finishing vessel again through the nozzles on the inner cylinder surface, completing the internal circulation finishing process. Part of the anti-UV finishing mixture flowed out from the anti-UV finishing mixture outlet, passed through the separator, external circulation pipeline, high-pressure pump, preheater mixer, and then entered the finishing vessel to complete the external circulation finishing process. The flax fiber underwent multi-directional anti-UV finishing for 60 minutes.

[0030] After finishing, the flax fibers that have undergone UV-resistant finishing in the UV-resistant finishing kettle are taken out, and the excess UV-resistant finishing agent is washed off the flax fibers under a carbon dioxide atmosphere; after the UV-resistant finishing is completed, the UV-resistant finishing mixture is separated and recovered; the UV protection factor (UPF) of the flax fibers reaches 55.

[0031] Example 3

[0032] A certain amount of dispersion solution was obtained by uniformly mixing 5g of nano-TiO2, an anti-ultraviolet absorber, with 20g / L of ethanol. Then, 80g / L of glyoxal, 10g / L of polyethylene glycol, 8g / L of sodium dodecyl sulfate, and 2g / L of organosilicon were added to obtain a mixture of anti-ultraviolet finishing agents.

[0033] Two kilograms of flax fiber were placed in an anti-UV finishing vessel, and 80 ml of anti-UV agent mixture was added to the vessel. The refrigerator, carbon dioxide cylinder, high-pressure pump, and preheater were turned on. The carbon dioxide and anti-UV finishing agent mixture were mixed evenly in the mixer. After pressurization and heating, the mixture reached a supercritical state at a pressure of 20 MPa and a temperature of 60°C. The supercritical mixed fluid entered the anti-UV finishing vessel through the nozzles on the inner cylinder surface. Part of the fluid entered the hollow lifting spray bar and was sprayed out from the nozzle outlet. At the same time, part of the anti-UV finishing mixture entered the channel through the holes on the stirrer and mixed with another part of the fluid. It then entered the finishing vessel again through the nozzles on the inner cylinder surface, completing the internal circulation finishing process. Part of the anti-UV finishing mixture flowed out from the anti-UV finishing mixture outlet, passed through the separator, external circulation pipeline, high-pressure pump, preheater mixer, and then entered the finishing vessel to complete the external circulation finishing process. The flax fiber underwent multi-directional anti-UV finishing for 80 minutes. After finishing, the flax fibers that have undergone UV-resistant finishing in the UV-resistant finishing kettle are taken out, and the excess UV-resistant finishing agent is washed off the flax fibers under a carbon dioxide atmosphere; after the UV-resistant finishing is completed, the UV-resistant finishing mixture is separated and recovered; the UV protection factor (UPF) of the flax fibers reaches 58.

[0034] Example 4

[0035] 8g of nano-TiO2, an anti-UV absorber, was mixed with 15g / L of ethanol to obtain a certain amount of dispersion solution. Then, 12g / L of glyoxal, 15g / L of polyethylene glycol, 8g / L of sodium dodecyl sulfate, and 6g / L of organosilicon were added to obtain a mixture of anti-UV finishing agents.

[0036] 10 kg of flax fiber was placed in an anti-UV finishing vessel, and 150 ml of anti-UV agent mixture was added to the vessel. The refrigerator, carbon dioxide cylinder, high-pressure pump, and preheater were turned on. The carbon dioxide and anti-UV finishing agent mixture were uniformly mixed in the mixer. After pressurization and heating, it reached a supercritical state with a pressure of 18 MPa and a temperature of 55°C. The supercritical mixed fluid entered the anti-UV finishing vessel through the nozzles on the inner cylinder surface. Part of the fluid entered the hollow lifting spray bar and was sprayed out from the nozzle outlet. At the same time, part of the anti-UV finishing mixture entered the channel through the holes on the stirrer and mixed with another part of the fluid. It then entered the finishing vessel again through the nozzles on the inner cylinder surface, completing the internal circulation finishing process. Part of the anti-UV finishing mixture flowed out from the anti-UV finishing mixture outlet, passed through the separator, external circulation pipeline, high-pressure pump, preheater mixer, and then entered the finishing vessel to complete the external circulation finishing process. The flax fiber underwent multi-directional anti-UV finishing for 90 minutes. After finishing, the flax fibers that have undergone UV-resistant finishing in the UV-resistant finishing kettle are taken out, and the excess UV-resistant finishing agent is washed off the flax fibers under a carbon dioxide atmosphere; after the UV-resistant finishing is completed, the UV-resistant finishing mixture is separated and recovered; the UV protection factor (UPF) of the flax fibers reaches 60.

Claims

1. A supercritical carbon dioxide UV-resistant finishing device for flax fibers, comprising: Carbon dioxide cylinder, filter, cooler, high-pressure pump, preheater, mixer, circulating pump, separator and control system; characterized in that it is also equipped with an anti-ultraviolet finishing tank (7). The carbon dioxide cylinder is connected to the filter, cooler, high-pressure pump, preheater, mixer, UV-resistant finishing vessel, circulating pump and separator; the control system is electrically connected to the carbon dioxide cylinder, filter, cooler, high-pressure pump, preheater, mixer, circulating pump and separator; the stirrer (4) and the rotating device (2) are both electrically connected to the control system; the control system is used to control the start and stop of the carbon dioxide cylinder, filter, cooler, high-pressure pump, preheater, mixer, UV-resistant finishing vessel, circulating pump, separator, stirrer (4) and rotating device (2); The UV-resistant finishing kettle (7) is equipped with a finishing kettle inner cylinder (6), a stirrer (4), a hollow base (3), and a rotating device (2). The rotating device (2) is installed on the hollow base (3), and the finishing kettle inner cylinder (6) is fixedly installed on the rotating device (2). The rotating device (2) is used to drive the finishing kettle inner cylinder (6) to rotate. The bottom of the finishing kettle inner cylinder (6) is equipped with a stirrer (4), which has several holes with a diameter of 0.5 to 10 mm. Multiple spray holes (5) are evenly distributed on the side wall of the finishing kettle inner cylinder (6). The number of spray holes (5) on the side wall of the finishing kettle inner cylinder (6) is 10 to 100, and the diameter is 1 to 10 mm. There is a certain distance between the bottom of the UV-resistant finishing kettle (7) and the bottom of the finishing kettle inner cylinder (6). A channel for the UV-resistant finishing agent is formed in the accommodating space between the bottom of the UV-resistant finishing kettle (7), the hollow base (3), and the finishing kettle inner cylinder (6). The channel for the UV-resistant finishing agent is connected to the finishing agent inlet (1). The base (3) is hollow ring-shaped. One end of the hollow ring-shaped base (3) is connected to the bottom of the inner cylinder (6) of the finishing kettle, and the other end is connected to the bottom of the UV-resistant finishing kettle (7). A hollow lifting spray bar (17) is also provided in the space between the bottom of the UV-resistant finishing vessel (7), the hollow base (3), and the inner cylinder (6) of the finishing vessel. The spray outlet of the hollow lifting spray bar (17) is directly opposite the spray hole (5) of the inner cylinder of the finishing vessel, and the liquid inlet end of the hollow lifting spray bar (17) is connected to the finishing agent inlet (1).

2. A method for UV-resistant finishing of flax fiber fabrics using the supercritical carbon dioxide UV-resistant finishing device for flax fibers as described in claim 1, characterized in that, Includes the following steps: 0.5–100 g of UV absorber nano-TiO2 was mixed with 1–100 g / L ethanol to obtain a dispersion solution; then 1–100 g / L glyoxal, 1–100 g / L polyethylene glycol, 1–50 g / L sodium dodecyl sulfate and 1–50 g / L organosilicon were added to the dispersion solution to obtain a UV-resistant finishing mixture. The obtained UV-resistant finishing mixture is placed into the finishing agent reactor. The refrigerator is turned on, the carbon dioxide cylinder is opened, and the high-pressure pump and preheater are turned on. Carbon dioxide is introduced into the finishing agent reactor at a flow rate of 5-10 g / min. The UV-resistant finishing mixture and carbon dioxide are mixed at a temperature of 35-60℃ and a pressure of 8-18 MPa for 5-30 min. The UV-resistant finishing mixture reaches the supercritical state under the action of supercritical carbon dioxide, and a supercritical mixed fluid is obtained. 2–10 kg of flax fiber is placed in an anti-UV finishing vessel. A supercritical mixed fluid is added to the vessel. Carbon dioxide is introduced at a flow rate of 5–30 g / min under a temperature of 35–120℃ and a pressure of 8–30 MPa. Part of the fluid enters the hollow lifting spray bar and is sprayed out through the spray outlet. It then enters the finishing vessel through the spray holes on the inner cylinder surface. A rotating device drives the finishing vessel to rotate, performing multi-directional anti-UV finishing on the flax fiber for 20–150 minutes. Simultaneously, part of the anti-UV finishing mixture enters the channel through the holes on the agitator and mixes with another part of the fluid. It then re-enters the finishing vessel through the spray holes on the inner cylinder surface, completing the internal circulation finishing process. Part of the anti-UV finishing mixture flows out from the anti-UV finishing mixture outlet, passes through a separation vessel, an external circulation pipeline, a high-pressure pump, a preheater mixer, and then enters the finishing vessel, completing the external circulation finishing process. Take out the flax fibers that have undergone UV-resistant treatment in the UV-resistant finishing autoclave, and wash the flax fibers for 10 to 30 minutes at a temperature of 35 to 40°C and a pressure of 8 to 10 MPa under a carbon dioxide atmosphere to remove excess UV-resistant finishing agent. After the UV-resistant finishing process is completed, the UV-resistant finishing mixture is separated and recovered.

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