阅读说明：本技术 一种基于超临界二氧化碳的染整方法 (Dyeing and finishing method based on supercritical carbon dioxide ) 是由 杨文芳 吴仪 于梦瑶 张城铭 李怡涵 于 2021-10-27 设计创作，主要内容包括：本发明提供了一种基于超临界二氧化碳的染整方法,其包括步骤：拒水剂预处理；对染料进行研磨,研磨后染料颗粒粒径小于1.5μm；将研磨后的拒水剂和染料置于处理釜底部；将聚酯织物置于处理釜中以及拒水剂和染料上方,自处理釜底部通入超临界二氧化碳；超临界二氧化碳经过、吸收和溶解拒水剂和染料后对聚酯织物进行染整处理；染整完成后,降低压力,取出聚酯织物。本发明为以超临界二氧化碳做介质的一浴一步染-整工艺技术方法,可用于在聚酯纤维染色及功能整理,缩短了加工流程,省时、提效、节能、没有水的消耗与无水排放,染料可回收,凸显了绿色染整理念。(The invention provides a dyeing and finishing method based on supercritical carbon dioxide, which comprises the following steps: pretreating a water repellent agent; grinding the dye, wherein the particle size of the ground dye particles is less than 1.5 mu m; placing the ground water repellent agent and the dye at the bottom of a treatment kettle; placing the polyester fabric in a treatment kettle and above a water repellent agent and a dye, and introducing supercritical carbon dioxide from the bottom of the treatment kettle; carrying out dyeing and finishing treatment on the polyester fabric after supercritical carbon dioxide passes through, absorbs and dissolves the water repellent agent and the dye; and after finishing, reducing the pressure and taking out the polyester fabric. The invention is a one-bath one-step dyeing-finishing process technical method taking supercritical carbon dioxide as a medium, can be used for dyeing and function finishing of polyester fibers, shortens the processing flow, saves time, improves efficiency, saves energy, has no water consumption and no water discharge, can recover dye, and highlights the concept of green dyeing and finishing.)

1. A dyeing and finishing method based on supercritical carbon dioxide is characterized by mainly comprising the following steps:

s10, pretreatment of the water repellent agent

Removing water in the water repellent agent to solidify the water repellent agent, and then grinding the solidified water repellent agent at the temperature of 100-105 ℃, wherein the particle size of the grinded water repellent agent is less than 2 mu m;

s20, grinding the dye, wherein the particle size of the ground dye particles is less than 1.5 mu m;

s30, placing the ground water repellent agent and the dye at the bottom of a treatment kettle;

s40, placing the polyester fabric in a treatment kettle and above a water repellent agent and a dye, and introducing supercritical carbon dioxide from the bottom of the treatment kettle; carrying out dyeing and finishing treatment on the polyester fabric after supercritical carbon dioxide passes through, absorbs and dissolves the water repellent agent and the dye;

the working temperature in the treatment kettle is 110-115 ℃, and the treatment time is 10-30 min; then, continuously heating to 125-135 ℃, and treating for 20-60 min; the pressure in the treatment kettle is maintained at 150-300 bar;

s50, after finishing dyeing and finishing, reducing the pressure and taking out the polyester fabric.

2. The supercritical carbon dioxide-based dyeing and finishing method according to claim 1, characterized in that in step S40, the flow rate of the supercritical carbon dioxide is 10-30 g/min.

3. The supercritical carbon dioxide based dyeing and finishing method according to claim 1, characterized by further comprising step S60: and (4) carrying out reduction cleaning on the polyester fabric after dyeing and finishing treatment.

4. The supercritical carbon dioxide-based dyeing and finishing method according to claim 3, characterized in that the reducing solution comprises 2-10 g/l sodium hydrosulfite, 2-10 g/l sodium hydroxide or sodium carbonate;

during reduction treatment, the treatment temperature is 50-60 ℃; the treatment time is 10-20 min.

5. The supercritical carbon dioxide based dyeing and finishing method according to claim 1, characterized by further comprising step S70: and recovering the residual dye, the water repellent and the supercritical carbon dioxide.

6. The supercritical carbon dioxide based dyeing and finishing method according to claim 1, characterized by further comprising step S11: pretreating the polyester fabric;

the polyester fabric is pretreated by using a refining agent and one or two of sodium carbonate, sodium hydroxide, trisodium phosphate and other alkaline agents, the pretreatment temperature is 40-60 ℃, the treatment time is 10-30 min, and the polyester fabric is fully washed and dried.

7. The supercritical carbon dioxide-based dyeing and finishing method according to claim 1, characterized in that the fabric is wound on a fabric holder and extends spirally outwards from the inside, and a space is left between two adjacent fabric layers; the fabric is placed in the treatment kettle through a fabric rack.

8. The supercritical carbon dioxide-based dyeing and finishing method according to claim 7, characterized in that the fabric rack comprises a middle sleeve, and connecting frames are symmetrically arranged at both ends of the middle sleeve; each connecting frame is provided with a plurality of connecting pieces which are fixedly connected with the edges of two sides of the fabric, and the connecting pieces are arranged at intervals on a spiral involute track taking the middle sleeve as the center.

9. The supercritical carbon dioxide based dyeing and finishing process of claim 8 wherein the connecting means is a hook or a clip.

10. The supercritical carbon dioxide-based dyeing and finishing method according to claim 8, characterized in that the connecting frame is of a spoke type and comprises an outer ring and spokes, one end of each spoke is connected with the outer ring, the other end of each spoke is fixedly connected with the middle sleeve, and the connecting pieces are arranged on the spokes.

Technical Field

The invention relates to the technical field of dyeing and functional finishing of textile materials, in particular to a dyeing and finishing method based on supercritical carbon dioxide.

Background

At present, two basic processing procedures of dyeing and functional finishing are usually needed for textile materials, and most of the existing dyeing and finishing technologies adopt water as a medium to carry out dyeing or functional finishing, and particularly for fabrics such as polyester fabrics and the like which are required to have a water-repellent function or other multiple functions, the dyeing and finishing technologies utilize the water medium to carry out dyeing and finishing treatment, and have the defects of large water consumption, large sewage discharge capacity, high energy consumption, low efficiency and the like.

Disclosure of Invention

The invention aims to provide a dyeing and finishing method based on supercritical carbon dioxide, which aims to solve at least one technical problem in the prior art.

In order to solve the technical problems, the dyeing and finishing method based on supercritical carbon dioxide provided by the invention mainly comprises the following steps:

s10, pretreatment of the water repellent agent

Removing water in the water repellent agent to solidify the water repellent agent, and then grinding the solidified water repellent agent at the temperature of 100-105 ℃, wherein the particle size of the grinded water repellent agent is less than 2 mu m;

s20, grinding the dye, wherein the particle size of the ground dye particles is less than 1.5 mu m;

s30, placing the ground water repellent agent and the dye at the bottom of a treatment kettle;

s40, placing the polyester fabric in a treatment kettle and above a water repellent agent and a dye, and introducing supercritical carbon dioxide from the bottom of the treatment kettle; carrying out dyeing and finishing treatment on the polyester fabric after supercritical carbon dioxide passes through, absorbs and dissolves the water repellent agent and the dye;

the working temperature in the treatment kettle is 110-115 ℃, and the treatment time is 10-30 min; then, continuously heating to 125-135 ℃, and treating for 20-60 min; the pressure in the treatment kettle is maintained at 150-300 bar;

s50, after finishing dyeing and finishing, reducing the pressure and taking out the polyester fabric.

The water repellent agent can be selected from water repellent finishing agents containing fluorine and organic silicon, is suitable for supercritical carbon dioxide environment, and is required to have good compatibility with dyes, such as FK, FK-582C, FWO-990 and the like, but not limited to the water repellent agents.

The dye may be a commercial disperse dye or a pure dye which is not commercially available. Purifying the commercial disperse dye according to a conventional process, and grinding the commercial disperse dye to be less than 1.5 mu m; pure dyes that are not commercially available after synthesis are also ground to below 1.5 μm, examples include but are not limited to: disperse red 73, disperse blue 79, disperse yellow 114.

Further, in step S40, the flow rate of the supercritical carbon dioxide is 10-30 g/min.

Further, the method also includes step S60: and (4) carrying out reduction cleaning on the polyester fabric after dyeing and finishing treatment.

Furthermore, the reducing solution comprises 2-10 g/l of sodium hydrosulfite and 2-10 g/l of sodium hydroxide or sodium carbonate.

Further, during reduction treatment, the treatment temperature is 50-60 ℃; the treatment time is 10-20 min.

Further, the method also includes step S70: and recovering the residual dye, the water repellent and the supercritical carbon dioxide.

Further, the method also includes step S11: the polyester fabric is pretreated.

Preferably, the polyester fabric is pretreated by using 0.5-5 g/l of refining agent and one or two of alkali agents such as sodium carbonate, sodium hydroxide, trisodium phosphate and the like, the pretreatment temperature is 40-60 ℃, the treatment time is 10-30 min, and the polyester fabric is fully washed and dried.

In general, the pretreatment of polyester fabric can be carried out on other dyeing and finishing devices, and the washing and drying are carried out and then the polyester fabric is placed in the treatment kettle for dyeing and finishing.

More preferably, the fabric is wound on the fabric rack, and the fabric spirally extends outwards from the inside, and a space is reserved between every two adjacent fabric layers; the fabric is placed in the treatment kettle through a fabric rack.

Furthermore, the fabric frame comprises a middle sleeve, and connecting frames are symmetrically arranged at two ends of the middle sleeve; each connecting frame is provided with a plurality of connecting pieces which are fixedly connected with two side edges (two side edges in the length direction) of the fabric, and the connecting pieces are arranged at intervals on a spiral involute track taking the middle sleeve as the center.

Further, the connecting piece is a hook or a clip.

Further, the link is the spoke type, including outer lane and spoke, spoke one end is connected with the outer lane, the other end and middle sleeve pipe fixed connection, the connecting piece sets up on the spoke.

Further, the intermediate sleeve is arranged along the flow direction of the supercritical carbon dioxide. I.e. the axial direction of the intermediate sleeve is substantially in the same direction as the flow of said supercritical carbon dioxide.

Furthermore, one end of the middle sleeve is closed, and the other end of the middle sleeve is provided with a liquid inlet; the wall of the middle sleeve is provided with a liquid outlet hole; part of the supercritical carbon dioxide which absorbs and dissolves the water repellent and the dye enters the middle sleeve through the liquid inlet through the pipeline and is sprayed out from the liquid outlet.

Preferably, the flow rate of the supercritical carbon dioxide ejected from the liquid outlet is 1/6-1/4 of the total flow rate of the supercritical carbon dioxide flowing through the treatment kettle.

Further, the liquid outlet holes are obliquely arranged, and the supercritical carbon dioxide sprayed out of the liquid outlet holes is forced to flow along the spiral interlayer among the fabric layers.

Through set up out the liquid hole on the middle sleeve pipe, thereby can effectively stir supercritical carbon dioxide flows between each layer of fabric, thereby effectively improve each layer of fabric and each layer positive and negative on dye molecule and water repellent agent molecule even adhesion, avoid the colour difference of fabric between each layer and in the direction of flow.

By adopting the technical scheme, the invention has the following beneficial effects:

the invention provides a one-bath one-step dyeing-finishing process technology method taking supercritical carbon dioxide as a medium, which can be used for dyeing and function finishing of polyester fibers, shortens the processing flow, saves time, improves efficiency, saves energy, has no water consumption and no water discharge, can recover dye, and highlights the concept of green dyeing and finishing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural view of a fabric rack and a treating kettle according to embodiment 6 of the present invention;

FIG. 2 is a top view of a fabric on a fabric support according to example 6 of the present invention;

FIG. 3 is a schematic structural view of a fabric holder and a treating kettle according to embodiment 7 of the present invention;

FIG. 4 is a schematic structural view of a fabric holder and a treating kettle according to embodiment 8 of the present invention;

fig. 5 is a schematic view of the middle tube filled with dye and water repellent in example 8 of the present invention.

Reference numerals:

10-a treatment kettle; 11-a middle partition plate; 12-a gas-permeable through hole; 20-a fabric rack; 21-an intermediate sleeve; 22-an outer ring; 23-spokes; 24-a connector; 30-a fabric; 40-a mixed particle layer; 41-a mixture of particles; 50-containing box.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

The present invention will be further explained with reference to specific embodiments.

Example 1

The embodiment discloses a dyeing and finishing method based on supercritical carbon dioxide, which mainly comprises the following steps:

s10, pretreatment of the water repellent agent

Removing water in the water repellent agent to solidify the water repellent agent, and then grinding the solidified water repellent agent at the temperature of 100-105 ℃, wherein the particle size of the grinded water repellent agent is less than 2 mu m;

s20, grinding the dye, wherein the particle size of the ground dye particles is less than 1.5 mu m;

s30, placing the ground water repellent agent and the dye at the bottom of a treatment kettle;

s40, placing the polyester fabric in a treatment kettle and above a water repellent agent and a dye, and introducing supercritical carbon dioxide from the bottom of the treatment kettle; carrying out dyeing and finishing treatment on the polyester fabric after supercritical carbon dioxide passes through, absorbs and dissolves the water repellent agent and the dye;

the working temperature in the treatment kettle is 110-115 ℃, and the treatment time is 10-30 min; then, continuously heating to 125-135 ℃, and treating for 20-60 min; the pressure in the treatment kettle is maintained at 150-300 bar; the flow rate of the supercritical carbon dioxide is 10-30 g/min.

Wherein, the dye dosage is 0.1-6% (o.w.f) and the water repellent dosage is 2-15% (o.w.f) according to the required dyeing depth.

S50, after finishing dyeing and finishing, reducing the pressure and taking out the polyester fabric.

And S60, carrying out reduction cleaning on the polyester fabric subjected to dyeing and finishing treatment. The reducing solution comprises 2-10 g/l of sodium hydrosulfite and 2-10 g/l of sodium hydroxide or sodium carbonate. During reduction treatment, the treatment temperature is 50-60 ℃; the treatment time is 10-20 min.

S70, recovering the residual dye, the water repellent and the supercritical carbon dioxide.

And more preferably, before step 10, step S11 is provided: the polyester fabric is pretreated. Preferably, the polyester fabric is pretreated by using a refining agent (0.5-5 g/l) and one or two of alkali agents such as sodium carbonate, sodium hydroxide and trisodium phosphate, the pretreatment temperature is 40-60 ℃, the treatment time is 10-30 min, and the polyester fabric is fully washed and dried.

The present invention relates to a supercritical carbon dioxide (SC-CO)₂) The one-bath one-step dyeing-water repellent finishing process is a medium, supercritical carbon dioxide is a nonpolar linear molecule, and has the characteristics of stable property, low price, easy obtainment, no toxicity, no harm, moderate critical temperature and pressure, good diffusion performance and the like, the treatment time can be effectively shortened in the dyeing process, no chemical auxiliary agent is required to be added, the energy consumption and the wastewater discharge are reduced, and the method is a better choice for replacing the traditional aqueous medium dyeing at present.

SC-CO₂The fluid has good swelling and plasticizing effects on hydrophobic polyester fibers, so that the glass transition temperature (Tg) of the fibers is reduced, the inter-macromolecular pores are increased, the dye is favorably diffused and entered, and the permeation and level dyeing degree are improved. The disperse dye is slightly soluble in water, and can be well and uniformly dissolved in SC-CO according to the principle of similarity and intermiscibility₂In the fluid, the obstacle that the traditional water bath method is difficult to dye the polyester fabric is overcome, and the dyed fabric has uniform color and bright color.

And the supercritical carbon dioxide is a nonpolar linear molecule, has low surface energy when being used as a nonpolar fluorine-containing water repellent finishing agent and an organic silicon water repellent agent, and has good solubility in a supercritical carbon dioxide medium, thereby realizing the possibility of water repellent finishing in the supercritical carbon dioxide medium. Because the water repellent finishing agent is liquid, the water repellent finishing agent is limited by the preparation process and is difficult to be used for supercritical CO₂The research on the one-bath one-step dyeing-finishing process of fabric finishing in a medium has not seen relevant reports. The invention realizes the designed one-bath one-step dyeing-water repellent finishing by curing and grinding the finishing agent.

The invention can be used for dyeing and function finishing of polyester fiber, shortens the processing flow, saves time, improves efficiency, saves energy, has no water consumption and no water discharge, can recover dye, and highlights the concept of green dyeing and finishing.

Example 2

This embodiment is substantially the same as embodiment 1 except that:

the embodiment is a polyester knitted fabric dyeing-water repellent finishing experiment, and the process flow is as follows: pretreating polyester fabric → dyeing-finishing → reduction cleaning;

the method mainly comprises the following steps:

1) pretreatment of dye and water repellent agent: the dye is selected from disperse red 73, and the grinding particle size is less than 1 μm; solidifying and grinding the fluorine-containing water repellent FK-582C to a particle size of less than 1.5 μm.

2) Pretreatment of polyester fabric: the polyester fabric is pretreated by 2g/l of refining agent and 5g/l of sodium carbonate at the treatment temperature of 50 ℃ for 20min, and then is fully washed and dried.

3) Dyeing-finishing treatment

Mixing a dye (disperse red 73) and a water repellent agent into a supercritical carbon dioxide medium, wherein the dosage of the disperse red 73 is 2 percent (o.w.f), and the dosage of the water repellent agent is 10 percent (o.w.f); then placing the fabric in a treatment kettle, and introducing a supercritical carbon dioxide medium (supercritical carbon dioxide), wherein the temperature of the treatment kettle is 110 ℃, the dyeing and finishing treatment time of the fabric is 20min, then continuously heating to 130 ℃, and continuously treating for 30min, the pressure of the treatment kettle is 300bar, and the flow of the carbon dioxide is 30 g/min.

4) Reduction cleaning

The fabric is reduced and cleaned by using a reducing solution containing 5g/l of sodium hydrosulfite and 3g/l of sodium hydroxide, the treatment temperature is 60 ℃, and the cleaning treatment time is 10 min.

Polyester fabric test results: the contact angle is 134.0 degrees, the washing color fastness is 4-5 grades, the dyeing is uniform, and the color meets the requirements.

Example 3

The present embodiment is substantially the same as embodiment 2, except that the dyeing and finishing temperature rise and the heat preservation parameters are different.

The process flow comprises the following steps: dye and water repellent agent pretreatment → polyester fabric pretreatment → dyeing-finishing → reduction cleaning.

Wherein, when the polyester fabric is pretreated: the polyester fabric is pretreated by using 2g/l of refining agent and 5g/l of sodium carbonate at the treatment temperature of 50 ℃ for 15min, and then is fully washed and dried.

During dyeing-finishing treatment, the dye (disperse red 73) and the water repellent are mixed into a supercritical carbon dioxide medium, wherein the dosage of the disperse red 73 is 2 percent (o.w.f), and the dosage of the water repellent is 10 percent (o.w.f); then placing the fabric in a treatment kettle, introducing a supercritical carbon dioxide medium (supercritical carbon dioxide), wherein the temperature of the treatment kettle is 115 ℃, the dyeing and finishing treatment time of the fabric is 20min, then continuously heating to 130 ℃, and continuously treating for 30min, the pressure of the treatment kettle is 300bar, and the flow of the carbon dioxide is 30 g/min.

The fabric test results were: the contact angle is 125.6 degrees, the color fastness to washing is 4-5 grades, the dyeing is uniform, and the color meets the requirements.

Example 4

This embodiment is substantially the same as embodiment 2 except that:

and (3) during pretreatment of the dye and the water repellent agent: grinding disperse red 73 to particle size of less than 1 μm, and solidifying fluorine-containing water repellent FK-582C to particle size of less than 3 μm;

the pretreatment time of the polyester fabric is 15min, and the polyester fabric is dried after being fully washed.

During dyeing-finishing treatment, the dosage of disperse red 73 is 2 percent (o.w.f), the dosage of water repellent is 10 percent (o.w.f), the treatment temperature is 110 ℃, the treatment time is 20min, the temperature is continuously raised to 130 ℃ for treatment for 30min, the pressure of a treatment kettle is 300bar, and the flow of the treatment liquid is 30 g/min.

And (3) testing results: the contact angle is 123.0 degrees, the color fastness to washing is 4-5 grades, the dyeing is uniform, and the color meets the requirements.

Example 5

This embodiment is substantially the same as embodiment 2 except that:

this example is a polyester woven fabric dyeing-water repellent finish; the process flow comprises the following steps: dye and water repellent agent pretreatment → polyester fabric pretreatment → dyeing-finishing → reduction cleaning.

And (3) during pretreatment of the dye and the water repellent agent: the dye is disperse yellow 114, and the grinding particle size is less than 1.5 mu m; solidifying and grinding the fluorine-containing water repellent agent FWO-990 to a particle size of less than 1 mu m;

pretreatment of polyester fabric: the polyester fabric is pretreated by using 2g/l of refining agent and 5g/l of sodium carbonate at the treatment temperature of 50 ℃ for 10min, and then is fully washed and dried.

During dyeing-finishing, the dye (disperse yellow 114) and the water repellent agent are mixed into a supercritical carbon dioxide medium, the dosage of disperse red 73 is 2 percent (o.w.f), and the dosage of the water repellent agent is 12 percent (o.w.f); then placing the fabric in a treatment kettle, and introducing a supercritical carbon dioxide medium (supercritical carbon dioxide), wherein the temperature of the treatment kettle is 110 ℃, the dyeing and finishing treatment time of the fabric is 30min, then continuously heating to 130 ℃, and continuously treating for 30min, the pressure of the treatment kettle is 300bar, and the flow of the carbon dioxide is 30 g/min.

And (3) testing results: the contact angle is 133.8 degrees, the color fastness to washing is 4-5 grades, the dyeing is uniform, and the color meets the requirements.

Example 6

The embodiment discloses a processing kettle structure for dyeing and finishing, wherein a fabric is wound on a fabric rack 20, as shown in fig. 1, a middle partition plate 11 is arranged at the bottom of a processing kettle 10, a plurality of air through holes 12 are arranged on the middle partition plate 11, and a mixture of ground dye and water repellent agent particles is uniformly spread on the middle partition plate 11 to form a mixed particle layer 40;

an interlayer structure is formed between the middle partition plate 11 and the bottom plate of the treatment kettle 10, the supercritical carbon dioxide enters the interlayer from an inlet at the bottom of the treatment kettle 10, then is discharged through the air through holes 12 and then passes through the mixed particle layer 40, and the polyester fabric is dyed and finished after the supercritical carbon dioxide absorbs and dissolves partial water repellent agents and dyes.

The fabric is placed in the treatment tank 10 through the fabric holder 20, and as shown in fig. 2, the fabric 30 extends spirally outward from the inside, and a space is left between two adjacent fabric layers.

The fabric rack 20 comprises a middle sleeve 21, and connecting frames are symmetrically arranged at two ends of the middle sleeve 21; each of the links is provided with a plurality of links 24 for fixedly connecting with both side edges (both side edges in the length direction) of the fabric, and the plurality of links 24 are arranged at intervals on a spiral involute trajectory centering on the middle sleeve 21. The connector 24 is a hook or a clip. The connecting frame is of a spoke type and comprises an outer ring 22 and spokes 23, one end of each spoke 23 is connected with the outer ring 22, the other end of each spoke is fixedly connected with the middle sleeve 21, and the connecting pieces 24 are arranged on the spokes 23.

The intermediate sleeve 21 is arranged in the flow direction of the supercritical carbon dioxide. I.e. the axial direction of the intermediate sleeve 21 is substantially the same as the flow direction of said supercritical carbon dioxide. The supercritical carbon dioxide flows from bottom to top, flows in from the inlet at the bottom of the treatment kettle and flows out from the outlet at the top.

The dyeing and finishing process shortens the processing flow, saves time, improves efficiency, saves energy, has no water consumption and no water discharge, can recover the dye, and highlights the green dyeing and finishing concept.

Example 7

This embodiment is substantially the same as embodiment 6 except that:

referring to fig. 3, the present embodiment includes a containing box 50, the containing box 50 is similar to a bottom clamping structure of a processing kettle, a sandwich cavity is arranged at the bottom of the containing box 50, an inlet is arranged at the bottom of the sandwich cavity, a plurality of air holes are arranged on the top surface of the sandwich cavity, the containing box 50 is filled with ground dye and water repellent agent particle mixture, a part of the supercritical carbon dioxide enters the sandwich cavity from the inlet at the bottom of the sandwich cavity through a pipeline, and is discharged through the dye and water repellent agent particle mixture layer after being discharged through the air holes, and the supercritical carbon dioxide absorbs and dissolves part of the water repellent agent and dye and then is discharged through an outlet at the top of the containing box 50.

The upper end of the middle sleeve 21 is closed, the lower end is provided with a liquid inlet, and the wall of the middle sleeve 21 is provided with a liquid outlet hole; the outlet at the top of the containing box 50 is connected with the liquid inlet of the middle sleeve 21 through a pipeline.

The supercritical carbon dioxide discharged from the containing box 50 enters the intermediate sleeve 21 through the liquid inlet and is sprayed out from the liquid outlet. Preferably, the flow rate of the supercritical carbon dioxide ejected from the liquid outlet is 1/6 to 1/4 of the total flow rate of the supercritical carbon dioxide flowing through the treatment kettle 10. And the liquid outlet holes are obliquely arranged and used for forcing the supercritical carbon dioxide sprayed out from the liquid outlet holes to tend to flow along the spiral interlayer between the fabric layers.

Through arranging the liquid outlet holes on the middle sleeve 21, the supercritical carbon dioxide can be effectively stirred to flow between each layer of the fabric, so that the uniform adhesion of dye molecules and water repellent molecules on each layer of the fabric and the front and back surfaces of each layer is effectively improved, and the color difference of the fabric between each layer and in the flowing direction is avoided.

Example 8

This example is substantially the same as example 7 except that:

referring to fig. 4, in this embodiment, the container is not provided, and part of the supercritical carbon dioxide which does not absorb and dissolve the dye and the water repellent enters the intermediate sleeve 21 through the liquid inlet and is ejected from the liquid outlet. Referring to fig. 5, the middle lower portion of the middle sleeve 21 is filled with the ground dye and water repellent agent particle mixture 41, and the filling height of the dye and water repellent agent particle mixture 41 can be adjusted or set according to the concentration of the supercritical carbon dioxide discharged through the liquid inlet.

The liquid inlet opening rate on the middle and lower pipe walls of the middle sleeve 21 filled with the ground dye and water repellent agent particle mixture 41 is gradually increased from bottom to top until the liquid inlet opening rate is consistent with the middle and upper parts. The aperture ratio of the liquid inlet can be adjusted and set according to the flow of the supercritical carbon dioxide sprayed from the liquid outlet, namely the total flow of the supercritical carbon dioxide flowing through the treatment kettle 10.

The structure of the embodiment is simpler, the implementation and the popularization are convenient, and the cost is lower.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.