Auxiliary tool for wool ready-made clothing bamboo knot pattern tie-dyeing and wool ready-made clothing bamboo knot pattern tie-dyeing method

Abstract

The present application relates to the technical field of textile printing and dyeing, and more specifically, it relates to an auxiliary tool for tie-dyeing wool garments with bamboo knot patterns and a tie-dyeing method for wool garments with bamboo knot patterns. The auxiliary tool for tie-dyeing wool garments with bamboo knot patterns includes an outer tube, an inner tube and an elastic mesh bag. The inner tube is inserted into the outer tube and slidably cooperates with the outer tube. The elastic mesh bag is sleeved outside the outer tube and fits with the outer side wall of the outer tube. The elastic mesh bag is used to maintain the wool garment in a predetermined tie-dyeing state for dyeing. The tie-dyeing method for wool garments with bamboo knot patterns includes pre-dyeing preparation, dyeing and cleaning. The above-mentioned auxiliary tool is used in the pre-dyeing preparation step. On the one hand, the initial tie-dyeing state of each wool garment can be kept as consistent as possible. On the other hand, the tie-dyeing state of the wool garment during the dyeing process can be kept stable, thereby improving the problem of unstable and inconsistent patterns between wool garment pieces.

Description

Technical Field

[0001] The present application relates to the technical field of textile printing and dyeing, and more specifically, to an auxiliary tool for wool garment bamboo knot pattern tie-dyeing and a wool garment bamboo knot pattern tie-dyeing method. Background Art

[0002] Tie-dyeing is technically divided into two parts: tying and dyeing. The pattern of tie-dye products depends on the tying stage. Tying means folding and hiding part of the fabric before dyeing, and then tying, twisting or sewing it to make it uncolored or less colored, so that the final product presents a visual effect of varying shades and rich color levels. It has more than one hundred variation techniques, and the patterns formed are also unique, including the bamboo pattern.

[0003] Tie-dyeing technology can be used to dye a variety of fabrics, including wool garments. When dyeing, the tied wool garments are put into a dye vat filled with dye. The wool garments will change in shape after they come into contact with water and during the dyeing process. During the operation of the dye vat, the wool garments will collide and squeeze with each other and with the vat wall with different forces. The tied state of the wool garments can easily change, which ultimately leads to unstable and inconsistent patterns between pieces of wool garments, making them unsuitable for large-scale and industrialized production. Summary of the invention

[0004] In order to improve the problem of unstable and inconsistent patterns between wool garment pieces, the present application provides an auxiliary tool for tie-dyeing wool garments with bamboo-knot patterns and a method for tie-dyeing wool garments with bamboo-knot patterns.

[0005] In the first aspect, the present application provides an auxiliary tool for bamboo knot pattern tie-dyeing of wool garments, which adopts the following technical solution:

[0006] An auxiliary tool for bamboo knot flower tie-dyeing of wool garments, comprising an outer tube, an inner tube and an elastic net bag for maintaining the wool garments in a predetermined tie-dye state for dyeing;

[0007] The inner tube is inserted into the outer tube and slidably matched with the outer tube;

[0008] The elastic mesh bag is sleeved on the outer tube and fits with the outer side wall of the outer tube.

[0009] By adopting the above technical solution, the elastic mesh bag is set outside the outer tube during use, and the folded wool garment is pinched and slowly sent into the outer tube with steady gestures and uniform force, so that the initial pattern state of each wool garment is as consistent as possible; when the wool garment is completely in the outer tube, the inner tube is used to support the wool garment and it is completely pushed into the elastic mesh bag with uniform force, which can effectively maintain the stability of the pattern. At the same time, the outer tube is moved in a direction away from the elastic mesh bag until the outer tube is separated from the elastic mesh bag, and then the open end of the elastic mesh bag is tied tightly.

[0010] Through the coordinated use of the outer tube and the inner tube, the wool garment to be dyed can be evenly and stably put into the elastic mesh bag, and the tension of the elastic mesh bag can effectively fix the initial pattern state of the wool garment, so that during the dyeing process, whether the wool garment is deformed by water and high temperature, or collides with the dye vat or other wool garments, it can maintain a fixed posture and appropriate tightness as much as possible in the elastic mesh bag, and maintain the initial pattern state to a large extent, thereby improving the problem of unstable and inconsistent patterns between wool garment pieces.

[0011] In a second aspect, the present application provides a wool garment slub pattern tie-dyeing method, which adopts the following technical solution: a wool garment slub pattern tie-dyeing method, comprising pre-dyeing preparation, dyeing and cleaning steps, wherein the pre-dyeing preparation step uses the aforementioned auxiliary tool for wool garment slub pattern tie-dyeing, including:

[0012] Steps of putting on the net, folding and plugging the pipe, removing the pipe and entering the net, and closing the net;

[0013] In the netting step, the elastic net bag is put on the outer tube;

[0014] In the folding and plugging tube step, the woolen garment is folded in a bamboo flower pattern and then fed into the outer tube;

[0015] In the step of removing the tube and entering the net, the wool garment is completely pushed into the elastic net bag by the inner tube, and the outer tube is separated from the elastic net bag;

[0016] In the net sealing step, the open end of the elastic net bag is tightly sealed.

[0017] By adopting the above technical solution and using this auxiliary tool for pattern tying, on the one hand, the initial pattern tying state of each wool garment can be kept as consistent as possible, and on the other hand, the pattern tying state of the wool garment can be kept stable during the dyeing process, thereby improving the problem of unstable and inconsistent pattern between wool garment pieces.

[0018] Preferably, before the net closing step, the method further includes the steps of measuring the length of the wool garment after entering the net and adjusting the tightness of the wool garment.

[0019] By adopting the above technical solution, the length of the wool garment after entering the net is measured, and then the tightness is adjusted according to the size of the wool garment, so that wool garments of different sizes can maintain the same tightness as much as possible, further improving the stability of the pattern.

[0020] Preferably, the wool garment is subjected to shrinkage prevention treatment before folding.

[0021] By adopting the above technical scheme, the wool garment can maintain its dimensional stability after shrinkage-proof treatment, avoiding the influence of different degrees of shrinkage of different parts of the wool garment on the stability of the pattern; the wool garment can be directly subjected to shrinkage-proof treatment, or the wool fabric can be subjected to shrinkage-proof treatment and then made into wool garment.

[0022] Preferably, the shrink-proof liquid used in the shrink-proof treatment is composed of raw materials with the following concentrations: the shrink-proof liquid used in the shrink-proof treatment contains the following components: 10-18 g / L polyacrylic acid; 3-7 g / L polyethylene glycol diglycidyl ether.

[0023] By adopting the above technical scheme, polyethylene glycol diglycidyl ether contains epoxy groups, polyacrylic acid contains carboxyl groups, and wool fibers contain amino groups and hydroxyl groups. These active groups react with each other through cross-linking to form a protective film with a network cross-linking structure on the surface of the wool fibers, which wraps the scale layer on the surface of the wool fibers, reduces the directional friction effect of the wool fibers, and thus reduces the possibility of felting. Polyethylene glycol diglycidyl ether contains flexible long chains, which can form flexible cross-linking with wool fibers. After flexible cross-linking, the activity of the wool fibers is enhanced. When subjected to external forces, the molecular chain segments can compensate and balance the stress distribution on each molecular chain through displacement, disperse the stress, and improve the breaking strength of the wool fibers.

[0024] Preferably, the concentration of the polyacrylic acid is 14-15 g / L.

[0025] Preferably, the shrink-proof liquid further comprises 2-6 g / L of cationically hydrophilically modified cellulose nanocrystals.

[0026] By adopting the above technical scheme, cellulose nanocrystals have the characteristics of high elastic modulus and high strength. The cellulose nanocrystals after cationic hydrophilic modification are positively charged, and there is an electrostatic effect between them and the negatively charged polyacrylic acid. They are filled into the network structure as reinforcing fillers, which improves the strength of the protective film and thus improves the breaking strength of the wool fibers.

[0027] Preferably, the cationic hydrophilically modified cellulose nanoparticles are prepared by reacting 2,3-epoxypropyltrimethylammonium chloride and cellulose nanocrystals in a mass ratio of (0.8-1.5):10.

[0028] Preferably, the shrink-proof liquid further comprises 2-5 g / L of ethyl 2-hydroxypropionate.

[0029] By adopting the above technical solution, the small molecule 2-hydroxyethyl propionate can diffuse into the gaps between the polyacrylic acid macromolecules, weakening the interaction between the polyacrylic acid macromolecules, providing the space required for the movement of the molecular chain segments, increasing the free volume, and synergizing with polyethylene glycol diglycidyl ether to further enhance the flexibility of the wool fiber and improve the breaking strength of the wool fiber.

[0030] In summary, this application has the following beneficial effects:

[0031] 1. The auxiliary tool of the present application is used for tie-dyeing bamboo knot patterns of wool garments. The auxiliary tool comprises an outer tube, an inner tube and an elastic mesh bag. The outer tube and the inner tube are used in combination so that the wool garments to be dyed are evenly and stably put into the elastic mesh bag, so that the initial tie-dyeing state of each wool garment is kept as consistent as possible; the tension of the elastic mesh bag can effectively fix the initial tie-dyeing state of the wool garments, so that during the dyeing process, the wool garments can maintain a fixed posture and appropriate tightness in the elastic mesh bag as much as possible, whether they are deformed by water and high temperature, or collide with the dye vat or other wool garments, and maintain the initial tie-dyeing state to a large extent, thereby improving the problem of unstable and inconsistent patterns between wool garment pieces.

[0032] 2. The method of the present application performs shrinkage-proof treatment on wool garments, which can maintain the stability of their dimensions and avoid the influence of different degrees of shrinkage on different parts of the wool garments, which may affect the stability of the pattern.

[0033] 3. In the method of the present application, in the shrinkage-proof treatment, polyethylene glycol diglycidyl ether, polyacrylic acid and water are prepared into an anti-shrinkage liquid, and then the wool garment is immersed in the anti-shrinkage liquid. Polyethylene glycol diglycidyl ether and polyacrylic acid form a film layer on the surface of the wool fiber, which wraps the scale layer on the surface of the wool fiber and reduces the possibility of felting. Polyethylene glycol diglycidyl ether contains ether bonds and has flexibility. It can form flexible cross-links with the wool fiber, and the breaking strength of the wool fiber is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram showing the steps of removing wool garments from tubes and feeding them into the net in the application example of the present application.

[0035] Figure 2 It is a schematic diagram showing that the wool garment is completely put into the elastic mesh bag and the mesh is sealed in the application example of the present application.

[0036] Figure 3 This is a diagram showing the tie-dyeing effect of wool garments in Application Example 1 of the present application.

[0037] Explanation of the accompanying drawings: 1. inner tube; 2. outer tube; 3. elastic mesh bag; 4. wool garment; 5. sealing tie. DETAILED DESCRIPTION

[0038] Preparation example of cellulose nanocrystals modified by cationic hydrophilicity

[0039] Preparation Example 1

[0040] The cellulose nanocrystals modified by cationic hydrophilicity are prepared according to the following steps:

[0041] Take 2.5 kg of cellulose nanocrystals and mix them with 180 L of distilled water, ultrasonically disperse them for 10 minutes, add 17.5 kg of sodium hydroxide and stir them at 25°C for 30 minutes, add 200 g of 2,3-epoxypropyltrimethylammonium chloride, heat to 65°C, keep the reaction for 5 hours, dialyze and freeze-dry to obtain cationic hydrophilic-modified cellulose nanocrystals.

[0042] Preparation Example 2

[0043] The difference between the cellulose nanocrystals modified by cationic hydrophilicity and Preparation Example 1 is that the mass of 2,3-epoxypropyltrimethylammonium chloride is different. The mass of 2,3-epoxypropyltrimethylammonium chloride in this Preparation Example is 375 g.

[0044] Preparation Example 3

[0045] The difference between the cellulose nanocrystals modified by cationic hydrophilicity and Preparation Example 1 is that the mass of 2,3-epoxypropyltrimethylammonium chloride is different. The mass of 2,3-epoxypropyltrimethylammonium chloride in this Preparation Example is 288 g.

[0046] Example

[0047] Example 1

[0048] The following is combined with Figure 1-2 This application is described in further detail.

[0049] The present application embodiment discloses an auxiliary tool for bamboo knot pattern tie-dyeing of wool garments. Figure 1 and Figure 2The auxiliary tool for wool garment bamboo flower pattern tie-dyeing includes an outer tube 2, an inner tube 1, an elastic mesh bag 3 and a sealing tie 5. The inner tube 1 is inserted into the outer tube 2 and slidably matched with the outer tube 2. The elastic mesh bag 3 includes an open end and a sealing end. The elastic mesh bag 3 is sleeved outside the outer tube 2 and fits the outer wall of the outer tube 2. The sealing tie 5 is used to tighten the sealing end of the elastic mesh bag 3. The elastic mesh bag 3 is used to maintain the wool garment 4 in a predetermined tie-dyeing state for dyeing. The length of the outer tube 2 is 30-35 cm. In this embodiment, the length of the outer tube 2 is 30 cm. The length of the inner tube 1 is 35-40 cm. In this embodiment, the length of the inner tube 1 is 35 cm. The length of the elastic mesh bag 3 is 60-70 cm. In this embodiment, the length of the elastic mesh bag 3 is 60 cm.

[0050] The present application is further described in detail below in conjunction with application examples.

[0051] Unless otherwise specified, the raw material specifications used in the following application examples and comparative examples are detailed in Table 1.

[0052] Table 1. Raw material specifications

[0053]

[0054] The wool garment felt used in the application example and the comparative example has a shrinkage rate of 15.5%. The wool garment felt is cut into samples of 5 cm×40 cm in size, and its warp breaking strength is measured to be 435N.

[0055] Application Examples

[0056] Application Example 1

[0057] The method for tie-dyeing wool garment bamboo knot pattern, using the auxiliary tool in Example 1, is as follows:

[0058] Preparation before staining:

[0059] S1, taking polyethylene glycol diglycidyl ether, polyacrylic acid and water to mix to prepare an anti-shrinkage liquid, the concentration of polyethylene glycol diglycidyl ether in the anti-shrinkage liquid is 3g / L, and the concentration of polyacrylic acid is 10g / L; putting 20kg of woolen garments into the anti-shrinkage liquid with a bath ratio of 1:15, heating to 45°C, double dipping and double rolling, the first dipping is 15min, the second dipping is 10min, taking out, and drying at 85°C.

[0060] S2, immerse the shrink-proof wool garment in S1 in water with a bath ratio of 1:2, treat at 40°C for 10 minutes, take out the wool garment, and dehydrate for 100 seconds.

[0061] S3, the elastic mesh bag in Example 1 is set on the outer side wall of the outer tube, so that the sealed end of the elastic mesh bag is tightened and the open end is piled up; the wool garment dehydrated in S2 is laid flat on the table, ready for tying flowers, and the wool garment is evenly folded up and down longitudinally, with a folding height of 2 cm; starting from the collar, the folded wool garment is pinched and fed into the outer tube with an average of 5 cm with a steady hand gesture and uniform force, so that the initial tying state of each wool garment is as consistent as possible, and is a bamboo flower shape.

[0062] When all the wool garments have entered the outer tube, the inner tube is used to support the wool garments and slowly pushed in the direction close to the sealing end of the elastic mesh bag with a steady force. At the same time, the outer tube is moved in the direction away from the elastic mesh bag. The wrinkles accumulated at the opening end of the elastic mesh bag are gradually stretched in this process until the wool garments are completely entered into the elastic mesh bag and the outer tube is separated from the elastic mesh bag. Through the coordinated use of the outer tube and the inner tube, the wool garments to be dyed can be evenly and steadily put into the elastic mesh bag.

[0063] Measure the length of the wool garment after entering the net, adjust its tightness according to the size of the wool garment, so that wool garments of different sizes can maintain the same tightness as much as possible. After adjusting the tightness, use a sealing tie to tighten the open end of the elastic mesh bag to maintain its original tied state, thereby improving the stability of the pattern.

[0064] dyeing:

[0065] S4, add 2% owf gallnut dye, 4g / L ferrous sulfate, 1g / L glacial acetic acid and 5g / L wool fixing agent into 50℃ water, fully dissolve to obtain dye, put the wool garment after being put into the dye solution, the bath ratio is 1:15, the pH value is 5, heat up to 85℃ at a speed of 1℃ / min, keep warm for 30min, and then cool down to 25℃ at a speed of 1℃ / min.

[0066] The tension of the elastic mesh bag can be used to effectively fix the initial pattern state of the wool garment, so that during the dyeing process, whether the wool garment is deformed by water and high temperature, or collides with the dye vat or other wool garments, it can maintain a fixed posture and appropriate tightness as much as possible in the elastic mesh bag, and maintain the initial pattern state to a large extent, thereby improving the problem of unstable and inconsistent patterns between wool garment pieces.

[0067] Cleaning:

[0068] S5, wash the wool garment dyed in S4 at 25°C, take out the washed wool garment from the elastic mesh bag, and soap wash the garment. The soap wash liquid contains 2g / L of soaping agent KFS, the bath ratio is 1:15, heat up to 80°C, keep warm for 20min, then cool down to 60°C, keep warm for 10min, take out, and dry at 80°C.

[0069] Application Example 2-5

[0070] The tie-dyeing method of wool garment bamboo pattern is different from that of application example 1 in that the composition of the anti-shrinkage liquid raw material is different, and the specific composition is shown in the following Table 2:

[0071] Table 2. Raw material composition of shrink-proof liquid

[0072]

[0073] Application Example 6

[0074] The tie-dyeing method of wool garment bamboo pattern is different from that of Application Example 1 in that: the cellulose nanocrystals modified by cationic hydrophilicity prepared in Preparation Example 1 are newly added to the shrink-proof liquid, and the concentration of the cellulose nanocrystals modified by cationic hydrophilicity is 2 g / L.

[0075] Application Example 7

[0076] The tie-dyeing method of wool garment bamboo pattern is different from that of Application Example 1 in that: the cellulose nanocrystals modified by cationic hydrophilicity prepared in Preparation Example 1 are newly added to the shrink-proof liquid, and the concentration of the cellulose nanocrystals modified by cationic hydrophilicity is 6 g / L.

[0077] Application Example 8

[0078] The tie-dyeing method of wool garment bamboo pattern is different from that of Application Example 1 in that: the cellulose nanocrystals modified by cationic hydrophilicity prepared in Preparation Example 1 are newly added to the shrink-proof liquid, and the concentration of the cellulose nanocrystals modified by cationic hydrophilicity is 4 g / L.

[0079] Application Example 9

[0080] The tie-dyeing method of wool garment bamboo pattern is different from that of Application Example 1 in that: the cellulose nanocrystals modified by cationic hydrophilicity prepared in Preparation Example 2 are newly added to the shrink-proof liquid, and the concentration of the cellulose nanocrystals modified by cationic hydrophilicity is 4 g / L.

[0081] Application Example 10

[0082] The tie-dyeing method of wool garment bamboo pattern is different from that of Application Example 1 in that: the cellulose nanocrystals modified by cationic hydrophilicity prepared in Preparation Example 3 are newly added to the shrink-proof liquid, and the concentration of the cellulose nanocrystals modified by cationic hydrophilicity is 4 g / L.

[0083] Application Example 11

[0084] The tie-dyeing method of bamboo knot pattern of wool garments is different from that of Application Example 1 in that ethyl 2-hydroxypropionate is added to the shrink-proof liquid, and the concentration of ethyl 2-hydroxypropionate is 2 g / L.

[0085] Application Example 12

[0086] The tie-dyeing method of bamboo knot pattern of wool garments is different from that of Application Example 1 in that ethyl 2-hydroxypropionate is added to the shrink-proof liquid, and the concentration of ethyl 2-hydroxypropionate is 5 g / L.

[0087] Application Example 13

[0088] The tie-dyeing method of wool garment bamboo pattern is different from that of application example 1 in that ethyl 2-hydroxypropionate is added to the shrink-proof liquid, and the concentration of ethyl 2-hydroxypropionate is 3.5 g / L.

[0089] Application comparison

[0090] Application Comparative Example 1

[0091] The tie-dyeing method of the bamboo-knot flower pattern of wool garments is different from that of Application Example 1 in that the tying step in S3 is different. In this application comparative example, the traditional bundling method is used to manually tie the wool garments in the bamboo-knot flower pattern.

[0092] Detection Methods

[0093] Referring to the method of GB 8628-1988, the wool garments prepared in Examples 1-10 and Comparative Example 1 were tested for shrinkage rate, and the shrinkage rate of the wool garments after tie-dyeing was calculated. The shrinkage rate was tested using the area shrinkage rate as the characterization method according to formula (1).

[0094] A=(S0-S1) / S0×100% (1)

[0095] In the formula: A is the area shrinkage rate; S0 is the area of ​​the wool garment before tie-dyeing; S1 is the area of ​​the wool garment after tie-dyeing. The lower the shrinkage rate, the better the shrinkage resistance of the wool garment. The specific test results are shown in Table 3 below:

[0096] Referring to the method of GB / T 3923.1-2013, the wool garments prepared in Application Examples 1-10 and Comparative Example 1 were cut into samples of 5 cm×40 cm in size. According to the method of GB / T 3923.1-2013, the samples were tested for the warp breaking strength to obtain the breaking strength retention rate of the wool garment after tie-dyeing (breaking strength retention rate=breaking strength after tie-dyeing / 435N×100%). The specific test results are shown in Table 3 below:

[0097] Wool garments were prepared according to the tie-dyeing method of application examples 1-10 and application comparison example 1. 100 pieces were prepared for each application example / application comparison example. Experienced technicians judged the stability of the pattern. The shape, position, size, and clarity of the pattern were close to the designed pattern, and the qualified product was calculated for each application example / application comparison example to characterize the stability of the wool garment pattern. The qualified rate = the number of qualified products / 100 × 100%. The higher the qualified rate, the better the stability of the wool garment pattern. The specific test results are shown in Table 3 below:

[0098] Table 3. Performance test of wool garments after tie-dyeing

[0099]

[0100] It can be seen from Table 3 that the shrinkage rate of the wool garments in the application example of this application is ≤3.6%, and the qualified rate is ≥92%. The shrinkage rate is low and the qualified rate is high, indicating that the pattern of the wool garments after tie-dying is stable and uniform, and is suitable for large-scale and industrialized production.

[0101] Combining Application Example 1 and Application Comparative Example 1 and Table 3, it can be seen that the qualified rate of wool garments prepared in Application Example 1 is much higher than that in Application Comparative Example 1, which indicates that the auxiliary tool of Example 1 is used in the flower-tying step of S3 in Application Example 1, and the auxiliary tool includes an outer tube, an inner tube, an elastic mesh bag and a sealing tie, and the inner tube and the outer tube are used together so that the wool garment can be evenly and stably put into the elastic mesh bag. On the one hand, the initial flower-tying state of each wool garment is kept as consistent as possible, and on the other hand, the tension of the elastic mesh bag can effectively fix the initial flower-tying state of the wool garment, so that the wool garment can maintain a fixed posture and appropriate tightness in the elastic mesh bag as much as possible during the dyeing process, whether it is deformed by water and high temperature, or collides with the dyeing vat or other wool garments, and the initial flower-tying state is maintained to a large extent, thereby obtaining a wool garment with stable and uniform flower pattern.

[0102] Combining Application Example 1, Application Example 5, and Table 3, it can be seen that the breaking strength retention rate of Application Example 1 is much higher than that of Application Example 5. This may be because: the shrink-proof liquid of Application Example 5 only contains polyacrylic acid, and polyacrylic acid is rigidly cross-linked with the active groups on the surface of the wool fiber to form a network structure film layer covering the surface of the wool fiber. The relative movement of the molecular segments in the wool fiber is restricted and constrained, and the freedom of movement is reduced. Therefore, when subjected to external force, it is difficult for the molecular segments to compensate and balance the stress distribution on each molecular segment through displacement, and the weak points on some segments will form stress concentration and break, resulting in a decrease in the breaking strength of the wool fiber.

[0103] The shrink-proof liquid of Application Example 1 contains polyethylene glycol diglycidyl ether, which contains soft long chains and forms flexible cross-links with wool fibers. After cross-linking, the activity of the wool fibers is enhanced. When subjected to external forces, the molecular chain segments can compensate and balance the stress distribution on each molecular chain through displacement, thereby dispersing the stress and reducing the uneven force on the fibers, thereby improving the breaking strength of the wool fibers.

[0104] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A method for tie-dyeing wool garments with bamboo knot patterns, comprising the steps of pre-dyeing preparation, dyeing and washing, characterized in that: The auxiliary tool used in the pre-dyeing preparation process comprises an outer tube (2), an inner tube (1) and an elastic mesh bag (3) for maintaining the wool garment (4) in a predetermined patterned state for dyeing, wherein the inner tube (1) is inserted into the outer tube (2) and slidably matched with the outer tube (2), and the elastic mesh bag (3) is sleeved on the outer tube (2) and fits with the outer side wall of the outer tube (2); The pre-dyeing preparation process includes the steps of putting on the net, folding and plugging the tube, removing the tube and putting the net in, and sealing the net; In the netting step, the elastic net bag is put on the outer tube; In the folding and plugging tube step, the wool garment is folded in a bamboo flower-shaped pattern and then fed into the outer tube. The wool garment is subjected to shrinkage-proof treatment before folding. The shrinkage-proof liquid used in the shrinkage-proof treatment contains the following components: 10-18 g / L polyacrylic acid; 3-7 g / L polyethylene glycol diglycidyl ether; 2-5 g / L ethyl 2-hydroxypropionate, and the shrinkage-proof liquid also includes 2-6 g / L cellulose nanocrystals modified by cationic hydrophilicity; In the step of removing the tube and entering the net, the wool garment is completely pushed into the elastic net bag by the inner tube, and the outer tube is separated from the elastic net bag; In the net sealing step, the open end of the elastic net bag is tightly sealed.

2. The method for tie-dyeing wool garment bamboo knot pattern according to claim 1, characterized in that: Before the net closing step, the method also includes the steps of measuring the length of the wool garment after entering the net and adjusting the tightness of the wool garment.

3. The method for tie-dyeing wool garment bamboo pattern according to claim 1, characterized in that: The concentration of the polyacrylic acid is 14-15 g / L.

4. The method for tie-dyeing wool garment bamboo knot pattern according to claim 1, characterized in that: The cationic hydrophilic modified cellulose nanoparticles are prepared by reacting 2,3-epoxypropyltrimethylammonium chloride and cellulose nanocrystals in a mass ratio of (0.8-1.5):10.

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