Anti-fake adhesive composite sewing thread and preparation method thereof

Abstract

The present application relates to a kind of anti-fake viscose composite sewing thread and preparation method thereof, belong to sewing thread technical field.The present application is first to the cationization pretreatment of viscose fiber to improve its binding force with anionic dye, then four different dyeing viscose fibers are prepared using natural fluorescent dye turmeric, madder and protein fluorescent dye phycocyanin, phycoerythrin respectively;Natural dyeing fiber is designed as relatively thick fineness and relatively long cut length, protein fluorescent dyeing fiber is designed as relatively thin fineness and relatively short cut length, mixed into base fiber according to equal proportion, is spun into anti-fake viscose composite sewing thread by clearing and combing, drawing, roving, spinning, winding and doubling twisting process, the sewing thread can present corresponding characteristic fluorescent color under specific wavelength excitation, and fluorescent hue and fiber fineness, cut length form fixed matching relationship, thus construct " fluorescent characteristic + fineness + length " multiscale composite anti-fake system, form difficult to imitate anti-fake password.

Description

Technical Field

[0001] This invention belongs to the field of sewing thread technology, and particularly relates to an anti-counterfeiting adhesive composite sewing thread and its preparation method. Background Technology

[0002] With the continuous upgrading of the demand for textile security and brand protection, anti-counterfeiting technology has become a core supporting technology in the fields of clothing and bags. Traditional anti-counterfeiting methods, such as anti-counterfeiting labels, barcodes, QR codes, and RFID tags, are widely used in product traceability and authenticity verification, but they are generally easy to copy, tamper with, or forge. Some external labels can also affect the appearance, feel, and wearing comfort of textiles, making it difficult to meet the long-term, stable, and concealed anti-counterfeiting requirements of high-end textiles.

[0003] As a key accessory in textiles, sewing thread is tightly bonded to the finished product and cannot be peeled off. Integrating anti-counterfeiting functions into the sewing thread itself enables full-process traceability and rapid, non-destructive authentication, becoming an important development direction in the textile anti-counterfeiting field. Currently, anti-counterfeiting sewing threads mostly achieve anti-counterfeiting through fiber material modification, structural design, or the addition of functional components. For example, fluorescent agents, metal chelates, and photochromic dyes are introduced into the fibers, or multi-layer composites, special twist and twist direction structures are used to improve the complexity and durability of anti-counterfeiting measures. Related technologies have been gradually applied in high-end apparel, luxury packaging, and specialty textiles.

[0004] Existing patents related to anti-counterfeiting yarns and sewing threads still have many limitations. CN112501739A discloses an anti-counterfeiting yarn using a composite structure of core thread and soluble outer thread. This requires dissolving the outer thread to expose the anti-counterfeiting area, resulting in a complex production process that relies on organic solvents, poor eco-friendliness, and limited application scenarios. CN115074883A discloses a photothermal anti-counterfeiting yarn and its preparation method and application, achieving anti-counterfeiting through the in-situ reaction of cesium salts and tungsten salts. While it has good stability, identification requires specialized and complex testing equipment, hindering rapid on-site verification. CN105908513A discloses an anti-counterfeiting yarn and its manufacturing method, which utilizes… Crosslinking and fixing the anti-counterfeiting material onto the yarn surface using resin and fixing agent poses potential health risks and does not meet the requirements of green textiles. CN107916464A discloses an anti-counterfeiting yarn and its preparation method, which blends upconversion fluorescent material with polymer for spinning. The fluorescent component easily interferes with spinning and reduces the yarn's mechanical and performance properties. CN217324465U discloses an anti-counterfeiting fiber sewing thread that uses a surface coating for anti-counterfeiting. However, the coating is easily scraped off physically or chemically, resulting in insufficient reliability of the anti-counterfeiting measures.

[0005] Existing technologies have significant shortcomings in the selection of anti-counterfeiting components and the combination of multi-dimensional features. Most solutions use natural dyes or synthetic fluorescent agents alone. Natural dyes have relatively weak fluorescence intensity, while synthetic fluorescent agents have poor safety and environmental friendliness, and the two do not complement each other. Although protein fluorescent dyes have strong specific fluorescence, there are few technical solutions for combining them with natural fluorescent dyes for sewing threads, making it difficult to construct multi-band, multi-tone composite fluorescent features. At the same time, fiber fineness and length are mostly used only as spinning process parameters and are not precisely matched and combined with fluorescent features, resulting in a single anti-counterfeiting dimension, low code complexity, and vulnerability to reverse engineering.

[0006] In addition, existing anti-counterfeiting sewing threads generally use post-coating, spraying, or surface coating methods to load anti-counterfeiting information. The anti-counterfeiting components have weak bonding with the fiber body, and are prone to fluorescence decay and information loss after use such as washing and friction, resulting in low fluorescence brightness retention and anti-counterfeiting failure. Moreover, the process adaptability is poor, and anti-counterfeiting modification can easily interfere with conventional spinning processes such as carding, drawing, roving, spinning, and twisting, affecting production efficiency and finished product quality stability.

[0007] In summary, current anti-counterfeiting sewing thread technologies generally suffer from problems such as limited anti-counterfeiting dimensions, ease of counterfeiting, poor fluorescence stability, insufficient process compatibility, inadequate environmental protection and safety, and difficulty in rapid on-site identification. There is an urgent need to develop a new type of anti-counterfeiting sewing thread that deeply embeds anti-counterfeiting information into the fiber body, possesses multi-scale composite features, is process-friendly, and is green and safe, in order to meet the market demand of high-end textiles for highly reliable, highly concealed, and highly durable anti-counterfeiting measures. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention provides an anti-counterfeiting adhesive composite sewing thread and its preparation method. It employs a combination of natural fluorescent dyes (turmeric, madder) and protein fluorescent dyes (phycocyanin, phycoerythrin) to dye viscose fibers. By designing differentiated fineness and length of the dyed viscose fibers, the resulting fibers can exhibit characteristic colors with varying intensities and hues under different colored light excitations. Furthermore, by combining fluorescence characteristics, fiber length, and fiber fineness as multiple detection dimensions, a multi-scale composite anti-counterfeiting system is constructed.

[0009] The first objective of this invention is to provide a method for preparing anti-counterfeiting adhesive composite sewing thread, comprising the following steps:

[0010] S1. The first viscose fiber was dyed with turmeric dyeing solution to obtain turmeric-dyed viscose fiber;

[0011] The second viscose fiber was dyed with madder dye to obtain madder-dyed viscose fiber;

[0012] First, the third viscose fiber was pre-treated with a tannic acid solution with a mass fraction of 5%-10%, and then stained with phycocyanin dye solution to obtain phycocyanin-dyed viscose fiber.

[0013] First, the fourth viscose fiber was pre-treated with a tannic acid solution with a mass fraction of 5%-10%, and then dyed with phycoerythrin dye solution to obtain phycoerythrin-dyed viscose fiber.

[0014] S2. Cut the turmeric-dyed viscose fiber, madder-dyed viscose fiber, phycocyanin-dyed viscose fiber, and phycoerythrin-dyed viscose fiber described in S1 into equal lengths, and then mix them into the base fiber in equal proportions. Subsequently, process them through cleaning and combing, drawing, roving, spinning, winding and twisting processes to obtain the anti-counterfeiting viscose composite sewing thread.

[0015] In one embodiment of the present invention, before S1, a pretreatment step is further included, wherein the pretreatment is as follows: the viscose fiber is first immersed in a soda ash solution, heated to 60°C-80°C and kept at that temperature for 30-60 minutes, and then immersed in a chitosan solution, heated to 40°C-50°C and kept at that temperature for 30-60 minutes.

[0016] In one embodiment of the present invention, the mass fraction of the soda ash solution is 5%-10%;

[0017] And / or, the chitosan solution has a mass fraction of 2%-5% and a pH value of 5-6.

[0018] In one embodiment of the present invention, in S1, the mass fraction of curcumin in the turmeric dye solution is 2%-5%, and the mass fraction of lanthanum chloride is 5%-8%.

[0019] And / or, the fineness of the first viscose fiber is 2.22 dtex-3.33 dtex;

[0020] And / or, the dyeing process of the first viscose fiber is as follows: the liquor ratio is 1:(30-50), the pH value of the dye bath is 5-7, the dyeing temperature is 50℃-80℃, and the dyeing time is 30min-60min.

[0021] In one embodiment of the present invention, in S1, the mass fraction of madder pigment in the madder dye solution is 2%-5%, and the mass fraction of alum is 5%-8%;

[0022] And / or, the fineness of the second viscose fiber is 2.22 dtex-3.33 dtex;

[0023] And / or, the dyeing process of the second viscose fiber is as follows: the liquor ratio is 1:(30-50), the pH value of the dye bath is 5-7, the dyeing temperature is 50℃-80℃, and the dyeing time is 30min-60min.

[0024] In one embodiment of the present invention, in S1, the temperature of the pre-media treatment is 38°C-42°C and the time is 30 min-40 min;

[0025] And / or, the fineness of the third viscose fiber is 1.11 dtex-1.67 dtex;

[0026] And / or, the concentration of phycocyanin in the phycocyanin staining solution is 0.1 mg / mL to 0.5 mg / mL;

[0027] And / or, the dyeing process of the third viscose fiber is as follows: liquor ratio of 1:(30-50), dye bath pH value of 7-7.5, dyeing temperature of 30℃-45℃, and dyeing time of 40min-80min.

[0028] In one embodiment of the present invention, in S1, the temperature of the pre-media treatment is 38°C-42°C and the time is 30 min-40 min;

[0029] And / or, the fineness of the fourth viscose fiber is 1.11 dtex-1.67 dtex;

[0030] And / or, the concentration of phycoerythrin in the phycoerythrin staining solution is 0.1 mg / mL to 0.5 mg / mL;

[0031] And / or, the dyeing process of the fourth viscose fiber is as follows: the liquor ratio is 1:(30-50), the pH value of the dye bath is 7-7.5, the dyeing temperature is 30℃-45℃, and the dyeing time is 40min-80min.

[0032] In one embodiment of the present invention, in S2, the lengths of the turmeric-dyed viscose fibers and madder-dyed viscose fibers cut to the same length are independently 38mm-51mm; the lengths of the phycocyanin-dyed viscose fibers and phycoerythrin-dyed viscose fibers cut to the same length are independently 30mm-38mm.

[0033] And / or, the base fiber is selected from cotton and / or polyester fiber;

[0034] And / or, the total mass percentage of the turmeric-dyed viscose fiber, madder-dyed viscose fiber, phycocyanin-dyed viscose fiber, and phycoerythrin-dyed viscose fiber is 1.25%-6.25%.

[0035] In one embodiment of the present invention, in S2, the speed of the carding roller in the combing process of the combing and cleaning process is 600rpm-800rpm, and the carding gap is 0.35mm-0.4mm.

[0036] And / or, the back draw ratio of the drawing process is 1.5-1.6;

[0037] And / or, the draft ratio for roving is 5.5-6.5;

[0038] And / or, the draft ratio of the fine spinning process is 30-35, the twist is (70-85)T / 10cm, and the twist direction is S twist;

[0039] And / or, the twist of the twisting process is (50-60)T / 10cm, and the twist direction is Z twist.

[0040] A second objective of this invention is to provide an anti-counterfeiting adhesive composite sewing thread prepared by the method described.

[0041] The technical solution of the present invention has the following advantages compared with the prior art:

[0042] (1) The preparation method of the present invention first pre-treats the viscose fiber with cationization to enhance its binding force with anionic dyes, and then uses natural fluorescent dyes turmeric and madder and protein fluorescent dyes phycocyanin and phycoerythrin to prepare four different dyed viscose fibers through an appropriate dyeing process; the natural dye dyed fiber is designed with a coarser fineness and a longer cutting length, and the protein fluorescent dye dyed fiber is designed with a finer fineness and a shorter cutting length. They are mixed into the base fiber in equal proportions and spun into anti-counterfeiting viscose composite sewing thread through cleaning and combing, drawing, roving, spinning, winding and twisting processes. The sewing thread can exhibit corresponding characteristic fluorescent colors under specific wavelength excitation, and the fluorescent color tone forms a fixed matching relationship with the fiber fineness and cutting length. Thus, a multi-scale composite anti-counterfeiting system of "fluorescent feature + fineness + length" is constructed to form an anti-counterfeiting code that is difficult to imitate.

[0043] (2) The preparation method described in this invention uses a dual system of natural fluorescent dye and protein fluorescent dye to complement each other, taking into account the eco-friendly characteristics of natural fluorescent dye and the strong fluorescence characteristics of protein fluorescent dye, thus making up for the deficiency of insufficient fluorescence intensity of single dye. At the same time, a neutral buffer system and mild temperature conditions are used to carry out dyeing in response to the characteristics of protein fluorescent dye, avoiding protein denaturation and precipitation, improving dyeing rate and color fastness. Moreover, the anti-counterfeiting information is deeply integrated with the fiber body in the entire process of dyeing, cutting and spinning, and cannot be removed by simple processing. This breaks through the limitations of existing single anti-counterfeiting methods, and while improving the reliability and difficulty of cracking anti-counterfeiting, it is in line with the application concept of eco-friendly and healthy. Detailed Implementation

[0044] The present invention will be further described below with reference to specific embodiments, so that those skilled in the art can better understand and implement the present invention, but the embodiments are not intended to limit the present invention.

[0045] In this invention, unless otherwise stated, the curcumin used in the examples was purchased from Shanghai Maclean Biochemical Technology Co., Ltd. and was of analytical grade.

[0046] In this invention, unless otherwise stated, the madder pigment used in the embodiments was purchased from Jinke Plant Dyeing (Shanghai) Textile Technology Co., Ltd., and is an industrial product.

[0047] In this invention, unless otherwise stated, the phycocyanin used in the examples was purchased from Zhejiang Binmei Biotechnology Co., Ltd., and is reagent grade.

[0048] In this invention, unless otherwise stated, the phycoerythrin used in the examples was purchased from Zhejiang Binmei Biotechnology Co., Ltd., and is reagent grade.

[0049] In this invention, unless otherwise stated, the solvents for the dyes and solutions involved in the embodiments are all water.

[0050] Example 1

[0051] The anti-counterfeiting adhesive composite sewing thread and its preparation method in this embodiment specifically include the following steps:

[0052] S1. Pretreatment of viscose fibers: First, viscose fibers with a fineness of 1.44 dtex and 2.78 dtex are immersed in an 8% (w / w) soda ash solution, heated to 70℃ and kept at that temperature for 45 min, and then rinsed with clean water; then, they are immersed in a 3.5% (w / w) chitosan solution with a pH of 5.5, heated to 45℃ and kept at that temperature for 45 min, and finally rinsed with clean water to obtain pretreated viscose fibers;

[0053] S2. Dyeing of viscose fibers: Pretreated viscose fibers with a fineness of 2.78 dtex were dyed using turmeric dye and madder dye, respectively, with a liquor ratio of 1:30. The pH of the dye bath was first adjusted to 6 using acetic acid, then the temperature was raised to 65℃ and maintained for dyeing for 45 minutes, with gentle shaking and stirring during the process. After dyeing, the fibers were rinsed with water and soaped to remove excess dye. After a second water wash, the fibers were dried at low temperature to obtain turmeric-dyed viscose fibers and madder-dyed viscose fibers, respectively. The turmeric dye contained 3.5% curcumin and 6.5% lanthanum chloride; the madder dye contained 3.5% madder pigment and 6.5% alum.

[0054] Pretreated viscose fibers with a fineness of 1.44 dtex were first pre-treated with a 7.5% tannic acid solution at 40℃ for 35 min. Then, they were stained with phycocyanin and phycoerythrin solutions respectively, with a liquor ratio of 1:30. The pH of the staining bath was adjusted to 7 using 0.01 mol / L PBS buffer. The temperature was then slowly increased to 40℃ and maintained for 60 min with gentle stirring. After staining, the fibers were rinsed with warm water and then dried at 40℃ to obtain phycocyanin-stained and phycoerythrin-stained viscose fibers, respectively. The concentration of phycocyanin in the phycocyanin staining solution was 0.3 mg / mL; the concentration of phycoerythrin in the phycoerythrin staining solution was 0.3 mg / mL.

[0055] S3. Preparation of anti-counterfeiting viscose composite sewing thread: Turmeric-dyed viscose fiber, madder-dyed viscose fiber, phycocyanin-dyed viscose fiber, and phycoerythrin-dyed viscose fiber are cut into equal lengths of 40mm, 45mm, 32mm, and 35mm respectively. The above-mentioned dyed viscose fibers are then mixed into cotton fibers in equal proportions, with a total mixing mass ratio of 3.75%. Subsequently, the fibers are processed through cleaning and carding, drawing, roving, spinning, winding, and twisting processes to obtain 40s / 2 anti-counterfeiting viscose composite sewing thread. Among them, in the cleaning and carding process, the carding roller speed is 600rpm and the carding gap is 0.4mm; the back zone draft ratio of the drawing process is 1.5; the draft ratio of the roving process is 6; the draft ratio of the spinning process is 30, the twist is 70T / 10cm, and the twist direction is S twist; the twist of the twisting process is 50T / 10cm, and the twist direction is Z twist.

[0056] Example 2

[0057] The process is basically the same as in Example 1, except that the preparation of the anti-counterfeiting adhesive composite sewing thread includes the following steps:

[0058] Turmeric-dyed viscose fiber, madder-dyed viscose fiber, phycocyanin-dyed viscose fiber, and phycoerythrin-dyed viscose fiber were cut into equal lengths of 40mm, 45mm, 32mm, and 35mm, respectively. These dyed viscose fibers were then mixed into polyester fiber (1.4dtex×38mm) in equal proportions, with a total blending mass percentage of 3.75%. The fiber was then processed sequentially through cleaning and carding, drawing, roving, spinning, winding, and twisting processes to produce 60s / 2 anti-counterfeiting viscose composite sewing thread. Specifically, in the cleaning and carding process, the carding roller speed was 800rpm and the carding gap was 0.35mm; the back zone draft ratio in the drawing process was 1.6; the draft ratio in the roving process was 6; the draft ratio in the spinning process was 35, the twist was 80T / 10cm, and the twist direction was S-twist; and the twist ratio in the twisting process was 56T / 10cm, and the twist direction was Z-twist.

[0059] Example 3

[0060] The process is basically the same as in Example 1, except that the preparation of the anti-counterfeiting adhesive composite sewing thread includes the following steps:

[0061] Turmeric-dyed viscose fiber, madder-dyed viscose fiber, phycocyanin-dyed viscose fiber, and phycoerythrin-dyed viscose fiber were cut into equal lengths of 40mm, 45mm, 32mm, and 35mm, respectively. These dyed viscose fibers were then mixed in equal proportions with cotton and polyester fibers (1.4 dtex × 38mm), with a total blending mass percentage of 3.75%, cotton fiber accounting for 35%, and polyester fiber accounting for 61.25%. Subsequently, the fibers were processed sequentially... The 50s / 2 anti-counterfeiting adhesive composite sewing thread is produced through a series of processes including carding, drawing, roving, spinning, winding, and twisting. Specifically, in the carding process, the carding roller speed is 750 rpm and the carding gap is 0.35 mm; the back zone draft ratio in the drawing process is 1.6; the draft ratio in the roving process is 6; the draft ratio in the spinning process is 35, the twist is 85T / 10cm, and the twist direction is S-twist; and the twist ratio in the twisting process is 60T / 10cm, and the twist direction is Z-twist.

[0062] Comparative Example 1

[0063] It is basically the same as Example 1, except that dyed viscose fibers were not mixed in.

[0064] Comparative Example 2

[0065] The basic structure is the same as in Example 2, except that: no phycocyanin-dyed viscose fibers or phycoerythrin-dyed viscose fibers were mixed in.

[0066] Comparative Example 3

[0067] The results are basically the same as in Example 3, except that the cut lengths of the turmeric-dyed viscose fiber and the madder-dyed viscose fiber are 30 mm and 35 mm, respectively, and the fineness is 1.44 dtex.

[0068] Test Example 1

[0069] Performance tests were conducted on the composite sewing threads prepared in the examples and comparative examples:

[0070] (1) Anti-counterfeiting code: Place the composite sewing thread under a fluorescence microscope, switch between ultraviolet light excitation filter and blue-green filter respectively, observe and record the fluorescence color of different characteristic fibers under corresponding excitation conditions; use the instrument's built-in software ranging function, use an automated stage and image stitching technology to measure the fiber length, specifically, mark the fiber start and end points in the software, the system automatically moves block by block to capture high-resolution images to ensure that adjacent images overlap, after acquisition, use the image stitching algorithm to fuse into a panoramic image, and then use a ranging tool to accurately measure the total fiber length; at the same time, use the software ranging function to measure the diameter of a specific color fiber, according to the formula D=100πd 2 ρ×10000 / 4 (D is fineness, unit dtex; d is diameter, unit cm; ρ is fiber density, unit g / cm³) converts the diameter to fineness, records the complete combination data of fiber fluorescence color, length, and fineness, compares it with the genuine standard data, and determines whether the sample is genuine.

[0071] (2) Breaking strength: In accordance with the standard GB / T3916-2013, the breaking strength of the anti-counterfeiting adhesive composite sewing thread to be tested was tested before washing and after five cycles of washing. The washing process was consistent with the fluorescence brightness retention rate test. That is, the Midea MD100V11D drum washing machine was used to complete five cycles of main washing, rinsing and dehydration according to the specified parameters. After natural drying, the breaking strength test was carried out, and the breaking strength data before and after washing was recorded.

[0072] (3) Fluorescence brightness retention rate: In accordance with the standard GB / T37074-2018, the fluorescence brightness values ​​of the anti-counterfeiting adhesive composite sewing thread before and after washing were tested using a fluorescence spectrophotometer. The washing operation was carried out using a Midea MD100V11D drum washing machine, in the order of one main wash, three rinses, and one spin-dry. The main wash temperature was 30℃, the water level was 100mm, and the time was 15min. The water level for the three rinses was 130mm, and the time was 3min, 2min, and 2min respectively. The spin-dry time was 2min. After washing, the yarn was hung to dry under natural conditions. The above washing process was repeated five times. Finally, the fluorescence brightness retention rate was calculated based on the fluorescence brightness values ​​before and after washing.

[0073] Table 1 shows the final measured parameters:

[0074] Table 1

[0075]

[0076] Note: Taking 1.44R32OY35 as an example, 1.44 represents the fineness, 32 and 35 represent the length, R and OY represent the color of viscose fiber under a fluorescence microscope, O is orange, R is red, Y is yellow, B is blue, and G is green.

[0077] As can be seen from Table 1, the composite sewing threads prepared in the examples all have dual-set composite anti-counterfeiting codes. They can exhibit differentiated fluorescence characteristics under ultraviolet light and blue-green light excitation, and the fluorescence brightness retention rate is higher than 70%. After multiple cycles of washing, the breaking strength retention rate is high and the strength loss rate is less than 15%, showing excellent anti-counterfeiting stability and durability.

[0078] Comparing Example 1 and Comparative Example 1, it can be seen that Comparative Example 1 did not add any anti-counterfeiting dyed viscose fiber, had no fluorescent anti-counterfeiting features, and did not have anti-counterfeiting identification capabilities. It only retained the basic mechanical properties of conventional sewing thread, which fully proves that anti-counterfeiting dyed viscose fiber is the core element for constructing the multi-scale composite anti-counterfeiting system of the present invention.

[0079] Comparing Example 2 and Comparative Example 2, it can be seen that Comparative Example 2 only added natural fluorescent dyes to dye the fibers, without compounding phycocyanin and phycoerythrin fluorescent components. It could only form a single set of anti-counterfeiting codes, and the fluorescence brightness retention rate was only 50.2%. This result is due to inherent defects such as incomplete conjugated system of natural dyes, insufficient molecular rigidity, and interference from raw material impurities, resulting in low fluorescence intensity and a single anti-counterfeiting dimension. This confirms that compounding natural fluorescent dyes with protein fluorescent dyes can significantly improve the anti-counterfeiting performance and fluorescence stability of sewing thread.

[0080] Comparing Example 3 and Comparative Example 3, it can be seen that Comparative Example 3 did not design the fineness and length matching of the naturally dyed fibers according to the scheme of the present invention. The fiber fineness was too fine and the cutting length was too short. Combined with the problem of weak fluorescence characteristics of natural dyes, the anti-counterfeiting code features were weakened and the fluorescence brightness retention rate was only 59.6%. It is clear that the accurate matching of fiber fineness, cutting length and fluorescence characteristics is the key technical condition to ensure the anti-counterfeiting effect and fluorescence durability of sewing thread.

[0081] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing an anti-counterfeiting adhesive composite sewing thread, characterized in that, Includes the following steps: S1. The first viscose fiber is dyed with turmeric dye to obtain turmeric-dyed viscose fiber; the fineness of the first viscose fiber is 2.22 dtex-3.33 dtex; The second viscose fiber was dyed with madder dye to obtain madder-dyed viscose fiber; the fineness of the second viscose fiber was 2.22 dtex-3.33 dtex; First, the third viscose fiber is pre-mordanted with a tannic acid solution with a mass fraction of 5%-10%, and then stained with phycocyanin dye to obtain phycocyanin-dyed viscose fiber; the fineness of the third viscose fiber is 1.11 dtex-1.67 dtex. First, the fourth viscose fiber is pre-mordanted with a tannic acid solution with a mass fraction of 5%-10%, and then dyed with phycoerythrin dyeing solution to obtain phycoerythrin-dyed viscose fiber; the fineness of the fourth viscose fiber is 1.11 dtex-1.67 dtex; S2. Cut the turmeric-dyed viscose fiber, madder-dyed viscose fiber, phycocyanin-dyed viscose fiber, and phycoerythrin-dyed viscose fiber described in S1 into equal lengths, and then mix them into the base fiber in equal proportions. Subsequently, process them sequentially through cleaning and combing, drawing, roving, spinning, winding, and twisting processes to obtain the anti-counterfeiting viscose composite sewing thread. The lengths of the turmeric-dyed viscose fiber and madder-dyed viscose fiber after being cut into equal lengths are independently 38mm-51mm; the lengths of the phycocyanin-dyed viscose fiber and phycoerythrin-dyed viscose fiber after being cut into equal lengths are independently 30mm-38mm.

2. The method for preparing anti-counterfeiting adhesive composite sewing thread according to claim 1, characterized in that, Before S1, the process also includes a pretreatment step for the viscose fiber, wherein the pretreatment involves immersing the viscose fiber in a soda ash solution, heating it to 60℃-80℃ and holding it at that temperature for 30min-60min, and then immersing it in a chitosan solution, heating it to 40℃-50℃ and holding it at that temperature for 30min-60min.

3. The method for preparing anti-counterfeiting adhesive composite sewing thread according to claim 2, characterized in that, The mass fraction of the soda ash solution is 5%-10%; And / or, the chitosan solution has a mass fraction of 2%-5% and a pH value of 5-6.

4. The method for preparing anti-counterfeiting adhesive composite sewing thread according to claim 1, characterized in that, In S1, the curcumin in the turmeric dye solution has a mass fraction of 2%-5% and a mass fraction of lanthanum chloride of 5%-8%. And / or, the dyeing process of the first viscose fiber is as follows: the liquor ratio is 1:(30-50), the pH value of the dye bath is 5-7, the dyeing temperature is 50℃-80℃, and the dyeing time is 30min-60min.

5. The method for preparing anti-counterfeiting adhesive composite sewing thread according to claim 1, characterized in that, In S1, the madder dye solution contains 2%-5% madder pigment by mass and 5%-8% alum by mass. And / or, the dyeing process of the second viscose fiber is as follows: the liquor ratio is 1:(30-50), the pH value of the dye bath is 5-7, the dyeing temperature is 50℃-80℃, and the dyeing time is 30min-60min.

6. The method for preparing anti-counterfeiting adhesive composite sewing thread according to claim 1, characterized in that, In S1, the temperature of the pre-media treatment is 38℃-42℃, and the time is 30min-40min; And / or, the concentration of phycocyanin in the phycocyanin staining solution is 0.1 mg / mL to 0.5 mg / mL; And / or, the dyeing process of the third viscose fiber is as follows: liquor ratio of 1:(30-50), dye bath pH value of 7-7.5, dyeing temperature of 30℃-45℃, and dyeing time of 40min-80min.

7. The method for preparing anti-counterfeiting adhesive composite sewing thread according to claim 1, characterized in that, In S1, the temperature of the pre-media treatment is 38℃-42℃, and the time is 30min-40min; And / or, the concentration of phycoerythrin in the phycoerythrin staining solution is 0.1 mg / mL to 0.5 mg / mL; And / or, the dyeing process of the fourth viscose fiber is as follows: the liquor ratio is 1:(30-50), the pH value of the dye bath is 7-7.5, the dyeing temperature is 30℃-45℃, and the dyeing time is 40min-80min.

8. The method for preparing anti-counterfeiting adhesive composite sewing thread according to claim 1, characterized in that, In S2, the base fiber is selected from cotton and / or polyester fiber; And / or, the total mass percentage of the turmeric-dyed viscose fiber, madder-dyed viscose fiber, phycocyanin-dyed viscose fiber, and phycoerythrin-dyed viscose fiber is 1.25%-6.25%.

9. The method for preparing anti-counterfeiting adhesive composite sewing thread according to claim 1, characterized in that, In S2, the carding roller speed in the combing process is 600rpm-800rpm, and the carding gap is 0.35mm-0.4mm. And / or, the back draw ratio of the drawing process is 1.5-1.6; And / or, the draft ratio for roving is 5.5-6.5; And / or, the draft ratio of the fine spinning process is 30-35, the twist is (70-85)T / 10cm, and the twist direction is S twist; And / or, the twist of the twisting process is (50-60)T / 10cm, and the twist direction is Z twist.

10. Anti-counterfeiting adhesive composite sewing thread prepared by the method of any one of claims 1-9.

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