Anti-fake silk composite sewing thread and preparation method thereof

Abstract

The present application relates to a kind of anti-fake silk composite sewing thread and preparation method thereof, belong to sewing thread technical field.The present application uses natural fluorescent dye (sanguinarine, berberine) and protein fluorescent dye (red fluorescent protein, enhanced yellow fluorescent protein) to carry out combination dyeing to silk, through the differentiation of the fineness and length design to dyed silk, natural fluorescent dye dyed silk uses relatively thick fineness and relatively long cut length, protein fluorescent dye dyed silk uses relatively thin fineness and relatively short cut length, so that the obtained fiber can present the characteristic color light of intensity, hue different under different color light excitation, and then combine fluorescence characteristics, silk length, silk fineness multiple detection dimension constructs multiscale composite anti-fake system.

Description

Technical Field

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

[0002] As competition intensifies in the high-end textile market and brand anti-counterfeiting demands become increasingly stringent, textile anti-counterfeiting technology has evolved from a supplementary safeguard to a core competitive advantage. Traditional anti-counterfeiting methods such as external labels, QR codes, and RFID chips generally suffer from problems such as easy removal and replacement, damage to the overall aesthetics of the product, and impact on wearing comfort. They are also ill-equipped to address the counterfeiting risks associated with multi-level distribution in the supply chain and fail to meet the core demands of high-end apparel and bags for discreet and durable anti-counterfeiting measures. Sewing thread, as a core accessory in textiles, runs throughout the entire product structure and is an ideal anti-counterfeiting carrier. By embedding anti-counterfeiting information within the fibers, "sewing itself is anti-counterfeiting" can be achieved without altering the appearance and is inseparable from the textile, covering the entire chain of traceability and authentication needs, with a wide range of applications.

[0003] Currently, anti-counterfeiting sewing threads for textiles are mainly developing along three technological paths: first, material composite anti-counterfeiting, which adds fluorescent materials, metal compounds, photochromic dyes, etc., to the fibers to achieve feature identification; second, process-embedded anti-counterfeiting, which combines anti-counterfeiting materials with fibers through special dyeing, cross-linking fixation, and surface modification; and third, structural differentiation anti-counterfeiting, which enhances the complexity of anti-counterfeiting through multi-layer composites, special twists, or segmented designs. Although these technologies have a certain anti-counterfeiting effect, they still have significant limitations in terms of anti-counterfeiting dimensions, bonding strength, ease of detection, and environmental safety, making it difficult to simultaneously achieve high barriers to entry, easy detection, low cost, and large-scale production.

[0004] Existing related patent technologies still have many shortcomings: CN107527549A discloses an anti-counterfeiting fiber and its preparation method, which prepares anti-counterfeiting fiber segments by ink printing. The anti-counterfeiting information is only attached to the surface and is easily rubbed off by friction and washing. Moreover, the anti-counterfeiting dimension of a single printed pattern is shallow and easily copied; CN117026620A discloses a plant-based upconversion and downconversion material dual fluorescent anti-counterfeiting fiber and its preparation method and application. It uses plant-based dual fluorescent anti-counterfeiting fiber. The process of combining fluorescent materials with fibers is complicated and costly. Detection requires special excitation equipment, and the feasibility of rapid on-site detection is low; CN217324465U discloses an anti-counterfeiting fiber sewing thread, which uses an amino acid metal chelate coating for bonding. Anti-counterfeiting agents are used, but adhesives can cause skin irritation and biotoxicity, and the single metal chelation feature is easily imitated, resulting in insufficient anti-counterfeiting strength. CN112853509A discloses a production method for anti-counterfeiting silk with anti-counterfeiting function, as well as its application and detection method. It prepares anti-counterfeiting silk by adding metal oxides to silkworm feed. The detection requires complex and destructive steps such as digestion and inductively coupled plasma spectroscopy, which cannot meet the requirements for rapid identification of finished products. CN104794512A discloses a coded fiber anti-counterfeiting agent and its preparation method. It uses electrospinning and laser cutting to prepare coded fibers. The process is complex, the equipment is highly specialized, and the use of organic solvents poses environmental risks, making it difficult to adapt to the large-scale production of sewing thread.

[0005] In summary, existing anti-counterfeiting sewing thread technologies suffer from four major pain points: First, the anti-counterfeiting features are limited in scope, often relying on single fluorescence, metallic elements, or surface patterns, making them easily imitated and cracked. Second, the anti-counterfeiting information is not firmly integrated with the fiber; surface coatings or post-treatments are prone to peeling and failure, and the embedding process is overly complex. Third, the detection threshold is high, often requiring specialized large instruments or destructive testing, making rapid, non-destructive on-site identification impossible. Fourth, the synergistic advantages of natural dyes and functional protein dyes have not been fully explored; natural dyes are environmentally friendly but have weak fluorescence signals, while protein dyes have strong fluorescence specificity but do not complement each other, failing to build a multi-dimensional, high-barrier anti-counterfeiting system.

[0006] Therefore, 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, has multi-scale composite features, is process-friendly, and is green and safe, in order to meet the urgent needs of high-end textiles for concealed, stable, efficient, and low-cost anti-counterfeiting technology. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides an anti-counterfeiting silk composite sewing thread and its preparation method. It employs a combination of natural fluorescent dyes (sanguisorbine and berberine) and protein fluorescent dyes (red fluorescent protein and enhanced yellow fluorescent protein) to dye silk. By designing differentiated fineness and length of the dyed silk, the resulting fibers can exhibit characteristic colors with varying intensities and hues under different colored light excitations. Furthermore, by combining fluorescence characteristics, silk length, and silk fineness as multiple detection dimensions, a multi-scale composite anti-counterfeiting system is constructed.

[0008] The first objective of this invention is to provide a method for preparing anti-counterfeiting silk composite sewing thread, comprising the following steps: S1. The first silkworm silk was dyed with sanguisorbin dye to obtain sanguisorbin-dyed silk. The second silkworm silk was dyed with berberine dye solution to obtain berberine-dyed silk. First, the third type of silk was dyed with red fluorescent protein dye solution, and then fixed with 0.1%-0.2% glutaraldehyde solution to obtain red fluorescent protein dyed silk. First, the fourth type of silk was dyed with an enhanced yellow fluorescent protein dye solution, and then the color was fixed with a 0.1%-0.2% glutaraldehyde solution to obtain silk dyed with enhanced yellow fluorescent protein. S2. Cut the sanguisorbin-dyed silk, berberine-dyed silk, red fluorescent protein-dyed silk, and enhanced yellow fluorescent protein-dyed silk described in S1 into equal lengths, and then mix them into the base fiber in equal proportions. Subsequently, the silk is processed through cleaning and combing, drawing, roving, spinning, winding, and twisting processes to obtain the anti-counterfeiting silk composite sewing thread.

[0009] In one embodiment of the present invention, before S1, a pretreatment step of the silk is included, wherein the pretreatment is as follows: the silk is first immersed in a soda ash solution, heated to 90℃-95℃ and kept at that temperature for 30min-60min, and then immersed in an acetic acid solution, heated to 30℃-40℃ and kept at that temperature for 15min-30min.

[0010] In one embodiment of the present invention, the mass fraction of the soda ash solution is 2%-3%; And / or, the acetic acid solution has a mass fraction of 0.5%-1% and a pH value of 5-6.

[0011] In one embodiment of the present invention, in S1, the concentration of sanguisorbin in the sanguisorbin dye solution is 1g / L-2g / L, and the concentration of tannic acid is 9g / L-11g / L. And / or, the single filament fineness of the first silk is 2.5D-3.5D; And / or, the dyeing process of the first silk is as follows: the bath ratio is 1:(30-40), the pH value of the dye bath is 5-7, the dyeing temperature is 60℃-75℃, and the dyeing time is 40min-60min.

[0012] In one embodiment of the present invention, in S1, the concentration of berberine in the berberine dye solution is 1 g / L-2 g / L; And / or, the monofilament fineness of the second silk is 2.5D-3.5D; And / or, the dyeing process of the second silk is as follows: the liquor ratio is 1:(30-40), the dyeing temperature is 60℃-75℃, and the dyeing time is 40min-60min.

[0013] In one embodiment of the present invention, in S1, the concentration of red fluorescent protein in the red fluorescent protein dye solution is 0.1 g / L-0.2 g / L; And / or, the monofilament fineness of the third silk is 1.1D-1.3D; And / or, the dyeing process of the third silk is as follows: the liquor ratio is 1:(30-40), the pH value of the dye bath is 7-7.5, the temperature is first raised to 32℃-38℃ and kept at that temperature for 22min-28min, then the temperature is raised to 40℃-42℃ and dyed for 50min-70min; And / or, during the dyeing process of the third silk, bovine serum albumin at a mass ratio of 0.08%-0.12% is also required; And / or, the temperature of the color-fixing treatment is 28℃-32℃, and the time is 20min-30min.

[0014] In one embodiment of the present invention, in S1, the concentration of enhanced yellow fluorescent protein in the enhanced yellow fluorescent protein dye solution is 0.1 g / L-0.2 g / L; And / or, the monofilament fineness of the fourth silk is 1.1D-1.3D; And / or, the dyeing process of the fourth silk is as follows: the liquor ratio is 1:(30-40), the pH value of the dye bath is 7-7.5, the temperature is first raised to 32℃-38℃ and kept at that temperature for 22min-28min, then the temperature is raised to 40℃-42℃ and dyed for 50min-70min; And / or, during the dyeing process of the fourth type of silk, bovine serum albumin at a mass ratio of 0.08%-0.12% is also required; And / or, the color-fixing treatment is performed at a temperature of 28℃-32℃ for a time of 20min-30min.

[0015] In one embodiment of the present invention, in S2, the lengths of the sanguisorbin-stained silk and berberine-stained silk after being cut to the same length are independently 30mm-51mm; the lengths of the red fluorescent protein-stained silk and enhanced yellow fluorescent protein-stained silk after being cut to the same length are independently 25mm-30mm. And / or, the base fiber is selected from cotton and / or polyester fiber; And / or, the total mass percentage of the silk stained with sanguisorbin, berberine, red fluorescent protein, and enhanced yellow fluorescent protein is 1.25%-6.25%.

[0016] 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. 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.

[0017] The second objective of this invention is to provide an anti-counterfeiting silk composite sewing thread prepared by the method described above.

[0018] The technical solution of the present invention has the following advantages compared with the prior art: (1) The preparation method of the present invention uses natural fluorescent dye and protein fluorescent dye to dye silk in a dual system. After dyeing, the silk is cut into equal lengths according to different specifications and mixed with basic fibers. Then, it is spun to obtain anti-counterfeiting silk composite sewing thread. The natural fluorescent dye has weak fluorescence intensity due to its own molecular structure and impurities, while the protein fluorescent dye has stronger fluorescence characteristics due to its unique molecular structure and excellent optical properties. The combination of the two can effectively make up for the deficiency of fluorescence of natural dye. It can present the corresponding fluorescent color by excitation with a specific wavelength, and the fluorescent color is precisely matched with the silk fineness and length. Then, a high-complexity anti-counterfeiting code is constructed with the combination data of fluorescence characteristics, fineness and length, which greatly improves the difficulty of anti-counterfeiting cracking.

[0019] (2) The preparation method described in this invention strengthens the ionic bond between silk and anionic fluorescent dye by protonating the amino group of silk. Under specific dyeing conditions, protein denaturation and precipitation can be avoided. Combined with glutaraldehyde fixation treatment, the color fastness can be significantly improved. After the protein fluorescent dye is combined with silk, the microenvironment, electron cloud distribution and energy level structure of the dye molecule are optimized. At the same time, the dye conformation is positively changed and non-radiative transitions are reduced, thereby further enhancing the fluorescence effect.

[0020] (3) The preparation method described in this invention implements differentiated specification design for dyed silk. Silk dyed with natural fluorescent dye adopts a coarser fiber and a longer cutting length, while silk dyed with protein fluorescent dye adopts a finer fiber and a shorter cutting length. This can significantly enhance the anti-counterfeiting detection features and improve the complexity and reliability of the anti-counterfeiting code. By matching the three features of fluorescence, silk fiber, and silk length, a multi-layer anti-counterfeiting verification system is constructed, which greatly increases the difficulty of counterfeiting. Moreover, the anti-counterfeiting information is embedded in the entire process of dyeing, cutting, and spinning and is closely combined with the fiber body, making it difficult to remove through conventional processing. This achieves a deep integration of dye characteristics, fiber physical parameters, and textile technology, effectively breaking through the limitations of existing single anti-counterfeiting methods. Detailed Implementation

[0021] 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.

[0022] In this invention, unless otherwise stated, the sanguisorbine used in the examples was purchased from Shanghai E-En Chemical Technology Co., Ltd., with a purity of 98%.

[0023] In this invention, unless otherwise stated, the berberine used in the examples was purchased from Shanghai Bailingwei Chemical Technology Co., Ltd., with a purity of 98%.

[0024] In this invention, unless otherwise stated, the red fluorescent protein used in the examples was purchased from Xi'an Qiyue Biotechnology Co., Ltd., and its purity is greater than 95%.

[0025] In this invention, unless otherwise stated, the enhanced yellow fluorescent protein used in the examples was purchased from Xi'an Qiyue Biotechnology Co., Ltd., with a purity greater than 95%.

[0026] In this invention, unless otherwise stated, the solvents for the dyes and solutions involved in the embodiments are all water.

[0027] Example 1

[0028] The anti-counterfeiting silk composite sewing thread and its preparation method in this embodiment specifically include the following steps: S1. Pretreatment of silk: First, immerse silk with a single filament fineness of 1.2D and 3D in a 2.5% (w / w) soda ash solution, heat to 92℃ and keep warm for 45 minutes, then rinse clean with water; then immerse it in a 0.8% (w / w) acetic acid solution with a pH of 5.5, heat to 35℃ and keep warm for 25 minutes, drain the water, and obtain pretreated silk. S2. Dyeing of silk: Pretreated silk with a single filament fineness of 3D was used for dyeing with sanguisorbin dye solution and berberine dye solution respectively, with a liquor ratio of 1:35. Then, the temperature was raised to 70℃ and kept at this temperature for 50 minutes, with gentle shaking and stirring during the process. After dyeing, the silk was rinsed with warm water and then dried at low temperature to obtain sanguisorbin-dyed silk and berberine-dyed silk respectively. The concentration of sanguisorbin in the sanguisorbin dye solution was 1.5 g / L, and the concentration of tannic acid was 10 g / L; the concentration of berberine in the berberine dye solution was 1.5 g / L. Pretreated silk with a single filament fineness of 1.2D was stained with red fluorescent protein (RFP) and enhanced yellow fluorescent protein (EFP) dyes at a liquor ratio of 1:35. The pH of the dye bath was adjusted to 7 using 0.01 mol / L PBS buffer, and 0.1% bovine serum albumin (BSA) was added to protect the protein structure. The temperature was then raised to 35°C and held for 25 min, followed by a further increase to 41°C and staining for 60 min, with gentle stirring during the process. After staining, the silk was immersed in a 0.15% glutaraldehyde solution with a pH of 7.2, heated to 30°C, and fixed for 25 min. After fixing, the silk was rinsed with PBS buffer and then dried at 40°C to obtain red fluorescent protein-stained silk and enhanced yellow fluorescent protein-stained silk, respectively. The concentration of red fluorescent protein in the red fluorescent protein dye solution was 0.15 g / L, and the concentration of enhanced yellow fluorescent protein in the enhanced yellow fluorescent protein dye solution was 0.15 g / L. S3. Preparation of Anti-counterfeiting Silk Composite Sewing Thread: Seraphine-dyed silk, berberine-dyed silk, red fluorescent protein-dyed silk, and enhanced yellow fluorescent protein-dyed silk were cut into equal lengths of 38mm, 46mm, 26mm, and 30mm respectively. These dyed silks were then mixed into cotton fibers in equal proportions, with a total mixing mass percentage of 3.75%. The thread was then processed sequentially through cleaning and carding, drawing, roving, spinning, winding, and twisting processes to obtain 40s / 2 anti-counterfeiting silk composite sewing thread. Specifically, in the cleaning and carding process, the carding roller speed was 600rpm, and the carding gap was 0.4mm; the back zone draft ratio in the drawing process was 1.5; the draft ratio in the roving process was 6; the draft ratio in the spinning process was 30, with a twist of 70T / 10cm and an S-twist direction; and the twist ratio in the twisting process was 50T / 10cm and a Z-twist direction.

[0029] Example 2

[0030] The process is basically the same as in Example 1, except that the anti-counterfeiting silk composite sewing thread is prepared by the following steps: Silk dyed with sanguisorbin, berberine, red fluorescent protein, and enhanced yellow fluorescent protein were cut into equal lengths of 38mm, 46mm, 28mm, and 30mm, respectively. These dyed silks were then mixed into polyester fibers (1.4dtex × 38mm) in equal proportions, with a total blending mass percentage of 3.75%. The yarn was then processed sequentially through cleaning and carding, drawing, roving, spinning, winding, and twisting processes to produce 60s / 2 anti-counterfeiting silk 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, with a twist of 80T / 10cm and an S-twist direction; and the twist ratio in the twisting process was 56T / 10cm and a Z-twist direction.

[0031] Example 3

[0032] The process is basically the same as in Example 1, except that the anti-counterfeiting silk composite sewing thread is prepared by the following steps: Silk dyed with sanguisorbin, berberine, red fluorescent protein, and enhanced yellow fluorescent protein were cut into equal lengths of 35mm, 45mm, 25mm, and 28mm, respectively. These dyed silks 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%. The mixture was subsequently cleaned... The 50s / 2 anti-counterfeiting silk 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.

[0033] Comparative Example 1

[0034] It is basically the same as Example 1, except that no dyed silk is mixed in.

[0035] Comparative Example 2

[0036] The process is basically the same as in Example 2, except that no silk dyed with sanguisorbin or berberine was mixed in.

[0037] Comparative Example 3

[0038] The process is basically the same as in Example 3, except that the cutting lengths of the sanguisorbin-dyed silk and berberine-dyed silk are 25 mm and 28 mm, respectively, and the single filament fineness is 1.2D.

[0039] Test Example 1

[0040] Performance tests were conducted on the composite sewing threads prepared in the examples and comparative examples: (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×9000 / 4 (D is fineness, unit D; d is diameter, unit cm; ρ is fiber density, unit g / cm³) 3 Convert the diameter to fineness, record the complete combination data of fiber fluorescence color, length, and fineness, compare it with the genuine standard data, and determine whether the sample is genuine. (2) Breaking strength: In accordance with the standard GB / T3916-2013, the breaking strength of the anti-counterfeiting silk 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.

[0041] (3) Fluorescence brightness retention rate: In accordance with the standard GB / T37074-2018, the fluorescence brightness values ​​of the anti-counterfeiting silk composite sewing thread to be tested were measured before and after washing 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.

[0042] Table 1 shows the final measured parameters: Table 1

[0043] Note: Taking 3OR38BG46 as an example, 3 represents fineness, 38 and 46 represent fiber length, OR and BG represent the color of silk under a fluorescence microscope, O is orange, R is red, Y is yellow, B is blue, and G is green.

[0044] As can be seen from Table 1, the anti-counterfeiting silk composite sewing threads prepared in the examples can all exhibit two complete anti-counterfeiting codes under ultraviolet light and blue-green light excitation, with fluorescence brightness retention rates all above 75%, and breaking strength loss rates before and after washing all below 15%, demonstrating excellent comprehensive anti-counterfeiting performance and stability in use. This is because the examples use a dual-system dyeing approach combining natural fluorescent dyes and protein fluorescent dyes, and implement differentiated fineness and length matching design for the silk, achieving coupling of triple anti-counterfeiting information in terms of fluorescence characteristics, fineness, and length. At the same time, the optimization of color-fixing process and spinning parameters ensures color fastness and mechanical properties.

[0045] Comparing Example 1 and Comparative Example 1, it can be seen that Comparative Example 1, because it did not add any anti-counterfeiting dyed silk, could not form an anti-counterfeiting code and did not have anti-counterfeiting function. This is because Comparative Example 1 is only ordinary basic fiber sewing thread, lacking the optical anti-counterfeiting features and fiber physical parameter anti-counterfeiting marks brought by fluorescent dye dyed silk, and does not have the multi-scale composite anti-counterfeiting effect described in this invention.

[0046] Comparing Example 2 and Comparative Example 2, it can be seen that Comparative Example 2, which only added natural fluorescent dye to dye silk and did not add protein fluorescent dye to dye silk, can only present one set of anti-counterfeiting codes, and the fluorescence brightness retention rate is only 51.1%. The anti-counterfeiting dimension and fluorescence stability are greatly reduced. This is because the fluorescence intensity of natural fluorescent dye itself is weak, lacking the strong fluorescence characteristics and complementary effect of protein fluorescent dye, and it is impossible to construct a dual-code system. In addition, the fluorescence is easy to decay, and the color fastness and durability are insufficient.

[0047] Comparing Example 3 and Comparative Example 3, it can be seen that although Comparative Example 3, due to the use of fine fibers and short cut specifications for the silk dyed with natural dyes, can identify two sets of codes, the fluorescence brightness is low, and the fluorescence brightness retention rate is only 64.7%, resulting in poor identification and stability of the anti-counterfeiting features. This is because the differentiated specification design of the present invention was not followed, and the natural fluorescent silk did not use coarse fibers and long cuts to enhance the basic fluorescence signal, resulting in insufficient overall fluorescence output and reduced reliability and durability of the anti-counterfeiting codes.

[0048] 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 anti-counterfeiting silk composite sewing thread, characterized in that, Includes the following steps: S1. The first silkworm silk was dyed with sanguisorbin dye to obtain sanguisorbin-dyed silk. The second silkworm silk was dyed with berberine dye solution to obtain berberine-dyed silk. First, the third type of silk was dyed with red fluorescent protein dye solution, and then fixed with 0.1%-0.2% glutaraldehyde solution to obtain red fluorescent protein dyed silk. First, the fourth type of silk was dyed with an enhanced yellow fluorescent protein dye solution, and then fixed with a 0.1%-0.2% glutaraldehyde solution to obtain silk dyed with enhanced yellow fluorescent protein. S2. The sanguisorbin-dyed silk, berberine-dyed silk, red fluorescent protein-dyed silk, and enhanced yellow fluorescent protein-dyed silk described in S1 are cut to equal lengths and then mixed into the base fiber in equal proportions. Subsequently, they are processed through cleaning and combing, drawing, roving, spinning, winding, and twisting processes to obtain the anti-counterfeiting silk composite sewing thread. The lengths of the sanguisorbin-dyed silk and berberine-dyed silk after being cut to equal lengths are independently 30mm-51mm; the lengths of the red fluorescent protein-dyed silk and enhanced yellow fluorescent protein-dyed silk after being cut to equal lengths are independently 25mm-30mm.

2. The method for preparing anti-counterfeiting silk composite sewing thread according to claim 1, characterized in that, Before S1, the process also includes a pretreatment step for the silk, wherein the pretreatment involves immersing the silk in a soda ash solution, heating it to 90℃-95℃ and holding it at that temperature for 30min-60min, and then immersing it in an acetic acid solution, heating it to 30℃-40℃ and holding it at that temperature for 15min-30min.

3. The method for preparing anti-counterfeiting silk composite sewing thread according to claim 2, characterized in that, The mass fraction of the soda ash solution is 2%-3%; And / or, the acetic acid solution has a mass fraction of 0.5%-1% and a pH value of 5-6.

4. The method for preparing anti-counterfeiting silk composite sewing thread according to claim 1, characterized in that, In S1, the concentration of sanguinarine in the sanguinarine staining solution is 1 g / L-2 g / L, and the concentration of tannic acid is 9 g / L-11 g / L. And / or, the single filament fineness of the first silk is 2.5D-3.5D; And / or, the dyeing process of the first silk is as follows: the bath ratio is 1:(30-40), the pH value of the dye bath is 5-7, the dyeing temperature is 60℃-75℃, and the dyeing time is 40min-60min.

5. The method for preparing anti-counterfeiting silk composite sewing thread according to claim 1, characterized in that, In S1, the concentration of berberine in the berberine dye solution is 1 g / L-2 g / L; And / or, the monofilament fineness of the second silk is 2.5D-3.5D; And / or, the dyeing process of the second silk is as follows: the liquor ratio is 1:(30-40), the dyeing temperature is 60℃-75℃, and the dyeing time is 40min-60min.

6. The method for preparing anti-counterfeiting silk composite sewing thread according to claim 1, characterized in that, In S1, the concentration of red fluorescent protein in the red fluorescent protein staining solution is 0.1 g / L-0.2 g / L; And / or, the third silk has a single filament fineness of 1.1D-1.3D; And / or, the dyeing process of the third silk is as follows: the liquor ratio is 1:(30-40), the pH value of the dye bath is 7-7.5, the temperature is first raised to 32℃-38℃ and kept at that temperature for 22min-28min, then the temperature is raised to 40℃-42℃ and dyed for 50min-70min; And / or, during the dyeing process of the third silk, bovine serum albumin at a mass ratio of 0.08%-0.12% is also required; And / or, the temperature of the color-fixing treatment is 28℃-32℃, and the time is 20min-30min.

7. The method for preparing anti-counterfeiting silk composite sewing thread according to claim 1, characterized in that, In S1, the concentration of enhanced yellow fluorescent protein in the enhanced yellow fluorescent protein dye solution is 0.1 g / L-0.2 g / L; And / or, the monofilament fineness of the fourth silk is 1.1D-1.3D; And / or, the dyeing process of the fourth silk is as follows: the liquor ratio is 1:(30-40), the pH value of the dye bath is 7-7.5, the temperature is first raised to 32℃-38℃ and kept at that temperature for 22min-28min, then the temperature is raised to 40℃-42℃ and dyed for 50min-70min; And / or, during the dyeing process of the fourth type of silk, bovine serum albumin at a mass ratio of 0.08%-0.12% is also required; And / or, the color-fixing treatment is performed at a temperature of 28℃-32℃ for a time of 20min-30min.

8. The method for preparing anti-counterfeiting silk 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 silk stained with sanguisorbin, berberine, red fluorescent protein, and enhanced yellow fluorescent protein is 1.25%-6.25%.

9. The method for preparing anti-counterfeiting silk 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 silk composite sewing thread prepared by the method of any one of claims 1-9.

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