Photosensitive thread and preparation method thereof

Abstract

The present application relates to the technical field of photosensitive threads, and more specifically, to a photosensitive thread and a preparation method thereof, wherein the photosensitive thread is prepared by the following raw materials in parts by weight: 5-15 parts of a photosensitive resin matrix, 10-20 parts of PET slices, 1-2 parts of a compatibilizer, 10-15 parts of acetate fiber, and 0-1 parts of other additives; each part of the photosensitive resin matrix is ​​prepared by melting a photosensitive material, a polyester polyol, and a polyester resin in a weight ratio of 3: (10-15): (20-35). The photosensitive thread prepared by the above raw materials can present different colors as the intensity of light changes, so that the color changes dynamically, lasts for a long time, and is not easy to fade. The fabric prepared using the photosensitive thread has good softness, good air permeability, uniform photochromic change, and long photochromic retention time.

Description

Technical Field

[0001] The present application relates to the technical field of photosensitive threads, and more specifically, to a photosensitive thread and a preparation method thereof. Background Art

[0002] As people's living standards improve, they have higher and higher requirements for the comfort, functionality and personalization of clothing fabrics, especially the color of fabrics. Previously, people only required a rich variety of colors, but with the development of technology, people want the color to change from static to dynamic, and people have explored light-sensitive color-changing textile fabrics.

[0003] Photochromic textile fabrics refer to fabrics that change color under the irradiation of light sources such as sunlight or ultraviolet light, and reversibly change back to the original color when the light disappears. However, the process for preparing photochromic fabrics in the prior art generally involves directly coating the fabric with photochromic coating (such as printing ink, paint printing) or dipping the textile silk thread with photochromic coating. The fabric coating method has the disadvantages of weak photochromic durability and poor air permeability, while the silk thread dipping method has the disadvantages of the silk thread being completely covered by the color-changing slurry, affecting its own properties (such as softness and air permeability), and also causing waste of the color-changing slurry. Summary of the invention

[0004] In order to improve the problems of poor photosensitive color durability and air permeability of fabrics, the present application provides a photosensitive thread and a preparation method thereof.

[0005] In a first aspect, the present application provides a photosensitive thread, which adopts the following technical solution:

[0006] A photosensitive thread, which is prepared by including the following raw materials in parts by weight:

[0007] 5-15 parts of photosensitive resin matrix

[0008] PET slices 10-20 pieces

[0009] 1-2 parts of compatibilizer

[0010] 10-15 parts of acetate

[0011] Other additives 0-1 part

[0012] Each portion of the photosensitive resin matrix is ​​prepared by melting a photosensitive material, polyester polyol and polyester resin in a weight ratio of 3: (10-15): (20-35).

[0013] By adopting the above technical solution, the prepared photosensitive thread can present different colors as the intensity of light changes, so that the color changes dynamically, lasts for a long time, and is not easy to fade. The fabric prepared by using the photosensitive thread has good softness, good air permeability, uniform light-sensitive color change, and long light-sensitive color retention time.

[0014] Among them, the photosensitive resin matrix has a strong photosensitive color change property. The photosensitive resin matrix is ​​added to the photosensitive silk thread by the method of blending melt spinning. Under different lighting conditions, the photosensitive silk thread will change color, so that the prepared fabric has dynamic color change and can be maintained for a long time. The photosensitive material, polyester polyol and polyester resin are melted to prepare the photosensitive resin matrix by reasonable proportion, which is conducive to the uniform distribution of the photosensitive material and long-term retention in the photosensitive silk thread. Polyester resin has good transparency and high brightness. As a carrier of photosensitive material, it will not affect the color change of the photosensitive material. However, the adhesion between polyester resin and photosensitive material is poor, which easily makes the photosensitive material unevenly distributed in the photosensitive resin matrix, resulting in uneven color distribution of the photosensitive silk thread and poor color effect. Therefore, polyester polyol is involved in the preparation of the photosensitive resin matrix. Polyester polyol has good adhesion, can improve the adhesion between ester resin and photosensitive material, so that the photosensitive material can be evenly distributed in the photosensitive resin matrix, thereby improving the color effect of the photosensitive silk thread.

[0015] PET slices can improve the softness of the photosensitive thread, and acetate fiber can improve the air permeability of the photosensitive thread. However, the physical properties of the photosensitive resin matrix, PET slices and acetate fiber are very different, and the compatibility is poor. The preparation of the photosensitive thread easily leads to the occurrence of lumps, breakage and other phenomena in the photosensitive thread. In this regard, in the present application, a compatibilizer is added to improve the compatibility of the photosensitive resin matrix, PET slices and acetate fiber, so that the surface of the prepared photosensitive thread is smooth and not easy to break.

[0016] Preferably, the acetate fiber is modified acetate fiber, which is prepared by the following method:

[0017] A: Dissolve cellulose acetate in glacial acetic acid to obtain cellulose acetate solution;

[0018] B: dissolving lignin in a sulfite solution to obtain a lignin-sulfite solution, then adding acrylic acid to the lignin-sulfite solution, raising the temperature to 50-60°C, adding hydrogen peroxide-ferrous sulfate dropwise to react, precipitating, filtering, and obtaining modified lignin;

[0019] C: Add the modified lignin to the acetate fiber solution, stir, heat to 70-80°C, then add 3-phenylpropionyl chloride and epichlorohydrin, react for 4-5h, cool to 20-30°C, add triethylamine dropwise to adjust the pH to 6.5-7.5, filter, and dry to obtain modified acetate fiber.

[0020] The use of acetate fiber to prepare photosensitive silk threads for the preparation of fabrics can improve the gloss of the fabrics and make them smooth and comfortable to the skin, with good air permeability. However, acetate fiber is not resistant to acid and alkali, and is not resistant to organic matter. It is not easy to use cleaning agents containing acid, alkali, and organic matter. Therefore, it is more troublesome to take care of fabrics containing acetate fiber. In contrast, the present application improves the acid and alkali resistance and organic resistance of acetate fiber by modifying the acetate fiber, which is beneficial to the care of fabrics containing acetate.

[0021] In the present application, lignin is modified so that the modified lignin reacts with acetate fiber to obtain modified acetate fiber, and the modified acetate fiber has good acid and alkali resistance and organic resistance. It is used to prepare photosensitive yarns, and the fabrics prepared using the photosensitive yarns have good acid and alkali resistance and organic resistance and are easy to care for. Preferably, the weight parts of the materials used for the modified acetate fiber are as follows:

[0022] 30-40 parts of acetate

[0023] 200-300 parts of glacial acetic acid

[0024] Lignin 10-15 parts

[0025] Sulfite solution 40-60 parts

[0026] Acrylic acid 15-20 parts

[0027] Hydrogen peroxide-ferrous sulfate 1-2 parts

[0028] 3-5 parts of 3-phenylpropionyl chloride

[0029] Epichlorohydrin 4-8 parts

[0030] 50-100 parts of triethylamine.

[0031] By using the above materials in a certain amount, the acid and alkali resistance and organic resistance of the modified acetate fiber are further improved. The modified acetate fiber is used to prepare photosensitive yarns, and the fabrics prepared by using the photosensitive yarns have good acid and alkali resistance and organic resistance, and are easy to take care of.

[0032] Preferably, the polyester resin has an acid ester of 30-36 mgKOH / g, a softening point (ring and ball method) of 103-113° C., a glass transition temperature of -60° C., and a melt viscosity (ICI, mPa.s / 200° C.) of 5000-8000 mPa.s.

[0033] By adopting the above technical scheme, the performance of the polyester resin is optimized so that the polyester resin can be fully mixed with the photosensitive material. At the same time, the flowability of the polyester resin is further optimized, which makes it easier for the polyester resin to carry the photosensitive material, and is beneficial for the photosensitive material to be evenly distributed in the photosensitive thread system, further improving the uniformity of the color change of the photosensitive thread, thereby improving the uniformity of the photosensitive color change of the fabric.

[0034] Preferably, the functionality of the polyester polyol is 2-3 and the average molecular weight is 2000-4000.

[0035] By adopting the above technical solution, the performance of polyester polyol is optimized, and the bonding force of polyester polyol is further improved, so that the photosensitive material and polyester resin can be stably bonded, which is conducive to promoting the uniform distribution of the photosensitive material in the photosensitive wire system.

[0036] Preferably, the compatibilizer is one of maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer, glycidyl methacrylate grafted acrylonitrile-butadiene-styrene copolymer or glycidyl methacrylate grafted styrene acrylonitrile copolymer.

[0037] By using the above compatibilizer, the compatibility of the photosensitive resin matrix, PET slices and acetate fiber is further improved to obtain a uniformly mixed system, thereby improving the smoothness, softness and air permeability of the photosensitive yarn. Preferably, the other auxiliary agent is at least one of an antioxidant, an anti-aging agent and an antistatic agent.

[0038] By adopting the above technical scheme, antioxidants are added to improve the antioxidant properties of the photosensitive thread, thereby reducing the damage to the structure of the photosensitive thread due to oxidation; anti-aging agents are added to improve the weather resistance of the photosensitive thread and extend the service life of the photosensitive thread; and antistatic agents are added to reduce the possibility of static electricity in the photosensitive thread.

[0039] Preferably, the photosensitive material is at least one of indoline spiropyran, 1,4-dihydroxyanthraquinone, 2-(2,4-dinitrobenzyl)pyridine and salicylanilide.

[0040] By adopting the above-mentioned photosensitive materials, the uniformity of the photosensitivity color change of the photosensitive thread can be further improved. The melting points of indoline spiropyran, 1,4-dihydroxyanthraquinone, 2-(2,4-dinitrobenzyl)pyridine and salicylanilide are 135°C, and the above-mentioned photosensitive materials are used to prepare the photosensitive resin matrix without destroying the structure of the original photosensitive material, thereby improving the photosensitivity color change stability of the photosensitive resin matrix.

[0041] In a second aspect, the present application provides a method for preparing a photosensitive thread, which adopts the following technical solution:

[0042] A method for preparing a photosensitive thread comprises the following steps:

[0043] S1. According to parts by weight, PTE slices, compatibilizer, photosensitive resin matrix, cellulose acetate and other additives are mixed, extruded and granulated to obtain photosensitive masterbatch;

[0044] S2. Under nitrogen protection, the photosensitive masterbatch is placed in a twin-screw extruder for extrusion spinning, the total supply of the spinning metering pump is controlled to be 450-500g / min, the spinning temperature is 240-250℃, the spinning speed is 800-1000m / min, and the drafting multiple is 2-2.5 times to obtain the photosensitive yarn.

[0045] By adopting the above technical solution, the prepared photosensitive silk thread has a smooth surface, good softness and uniform photosensitive color.

[0046] Preferably, the temperature of the extrusion step in S1 is: 210-220°C in zone I, 220-230°C in zone II, 230-240°C in zone III, 220-230°C in zone IV, and 210-220°C in zone V.

[0047] By adopting the above technical solution, the PTE slices, compatibilizer, photosensitive resin matrix, acetate fiber and other additives can be fully and evenly mixed, so that the photosensitive silk thread has uniform light color, smooth surface and good flexibility.

[0048] In summary, this application has the following beneficial effects:

[0049] 1. The present application is a photosensitive thread prepared by the joint action of PET slices, photosensitive resin matrix, acetate fiber, compatibilizer and other additives, wherein the photosensitive material, polyester polyol and polyester resin are melted to prepare the photosensitive resin matrix by reasonable proportion, so that the prepared photosensitive thread can show different colors as the intensity of light changes, which is conducive to the uniform distribution of the photosensitive material and its long-term retention in the photosensitive thread, so that the color of the photosensitive thread changes dynamically, and the duration is long, and it is not easy to fade. And the fabric prepared by using the photosensitive thread has good softness, good air permeability, uniform photosensitive color change and long photosensitive color change time. 2. The present application further improves the acid and alkali resistance and organic resistance of the modified acetate fiber by preparing modified acetate fiber with acetate fiber, glacial acetic acid, power index, sulfite solution, acrylic acid, hydrogen peroxide-ferrous sulfate, 3-phenylpropionyl chloride, epichlorohydrin and triethylamine. It is used to prepare photosensitive threads, and the fabric prepared by using the photosensitive threads has good acid and alkali resistance and organic resistance, and is easy to take care of the fabric. DETAILED DESCRIPTION

[0050] Preparation Examples 1 to 3

[0051] Preparation Example 1

[0052] A modified acetate fiber is prepared by the following preparation method:

[0053] A: Dissolve 0.3 kg of cellulose acetate in 2 kg of glacial acetic acid to obtain a cellulose acetate solution;

[0054] B: 0.1 kg of lignin was dissolved in 0.4 kg of sulfite solution to obtain a lignin-sulfite solution, and 0.15 kg of acrylic acid was added to the lignin-sulfite solution, the temperature was raised to 50°C, and 0.01 kg of hydrogen peroxide-ferrous sulfate was added dropwise to react, precipitate, and filter to obtain modified lignin;

[0055] C: Add the modified lignin to the acetate fiber solution, stir, heat to 70°C, then add 0.03 kg of 3-phenylpropionyl chloride and 0.04 kg of epichlorohydrin, react for 4 hours, cool to 20°C, add 0.5 kg of triethylamine dropwise to adjust the pH to 6.5-7.5, filter, and dry to obtain modified acetate fiber.

[0056] The sulfite solution used in the preparation example is a sodium sulfite solution with a mass fraction of 26%.

[0057] The hydrogen peroxide-ferrous sulfate used in the preparation example is obtained by mixing hydrogen peroxide and ferrous sulfate in a molar ratio of 1:2. The difference between Preparation Example 2 and Preparation Example 3 and Preparation Example 1 is that the materials and experimental parameters of some raw materials are different, and the rest of the experimental steps are consistent with Preparation Example 1.

[0058] The materials and amounts used in Preparation Examples 1-3 are shown in Table 1:

[0059] Table 1 Materials and amounts used in Preparation Examples 1-3

[0060]

[0061]

[0062] Example

[0063] The PET chips used in the present application have an intrinsic viscosity of 0.85 dL / g, a hardness of 4H, an abrasion resistance of 148 times / 1Kg, and a light transmittance of 88% under the condition of 380-780nm.

[0064] The glass transition temperature of commercially available acetate fiber is 185°C, the melting termination temperature is 310°C, and at the end of the heating, the fiber weight loss rate is 90.78%, the breaking strength of acetate fiber is 1.29 cN / dtex, and the strain is 31.44%.

[0065] Example 1

[0066] A photosensitive thread is prepared by the following preparation method:

[0067] S1, 1 kg of PTE slices, 0.1 kg of compatibilizer, 0.5 kg of photosensitive resin matrix, and 1 kg of commercially available acetate fiber are mixed, extruded, and granulated to obtain a photosensitive masterbatch;

[0068] S2. Under nitrogen protection, the photosensitive masterbatch was placed in a twin-screw extruder for extrusion spinning. The total supply of the spinning metering pump was controlled to be 450 g / min, the spinning temperature was 240°C, the spinning speed was 800 m / min, and the drafting multiple was 2 times to obtain the photosensitive yarn.

[0069] The photosensitive resin matrix is ​​prepared by melting a photosensitive material, polyester polyol and polyester resin in a weight ratio of 3:10:20.

[0070] The extrusion step temperatures in step S1 are: 210°C in zone I, 220°C in zone II, 230°C in zone III, 220°C in zone IV, and 210°C in zone V.

[0071] The photosensitive material is indoline spiropyran.

[0072] The acid ester of the polyester resin is 30 mgKOH / g, the softening point (ring and ball method) is 103°C, the glass transition temperature is -60°C, and the melt viscosity (ICI, mPa.s / 200°C) is 5000 mPa.s.

[0073] The functionality of the polyester polyol is 2 and the average molecular weight is 2000.

[0074] The compatibilizer is maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer, the melt index (200° C., 5 kg) of the maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer is 4 g / 10 min, and the grafting rate is 8%.

[0075] The difference between Examples 2-4 and Example 1 is that the types and amounts of some raw materials and the experimental descriptions are different, and the remaining experimental steps are consistent with the example.

[0076] The raw materials and amounts used in Examples 1-4 are shown in Table 2:

[0077] Table 2 Materials and dosages used in Examples 1-4

[0078]

[0079] The difference between Example 1 and Example 2 is that the acetate fiber in Example 2 comes from Preparation Example 1, and the other raw material types, amounts and test parameters are consistent with those in Example 1.

[0080] The acid ester of the polyester resin in Example 3 is 34 mgKOH / g, the softening point (ring and ball method) is 1.6°C, the glass transition temperature is -60°C, and the melt viscosity (ICI, mPa.s / 200°C) is 6500 mPa.s.

[0081] The photosensitive material is 1,4-dihydroxyanthraquinone.

[0082] The functionality of the polyester polyol is 2 and the average molecular weight is 2500.

[0083] The compatibilizer is glycidyl methacrylate grafted acrylonitrile-butadiene-styrene copolymer, the melt index (200° C., 5 kg) is 3 g / 10 min, and the grafting rate is 10%.

[0084] Other additives are antioxidants

[0085] The acid ester of the polyester resin in Example 4 is 36 mgKOH / g, the softening point (ring and ball method) is 113°C, the glass transition temperature is -60°C, and the melt viscosity (ICI, mPa.s / 200°C) is 8000 mPa.s.

[0086] The photosensitive material is 2-(2,4-dinitrobenzyl)pyridine.

[0087] The functionality of the polyester polyol is 3 and the average molecular weight is 4000.

[0088] Other additives are UV inhibitors.

[0089] The compatibilizer is glycidyl methacrylate grafted with styrene acrylonitrile, and has a number average molar mass of 7100000 g / mol and a dispersion degree of 2163.

[0090] Example 5

[0091] The difference between this embodiment and embodiment 2 is that polyether polyol is used in the photosensitive resin matrix to replace an equal amount of polyester polyol, and the other raw material types, amounts and test parameters are consistent with those in embodiment 1.

[0092] The functionality of the polyether polyol is 2 and the average molecular weight is 2000.

[0093] Example 6

[0094] The difference between this embodiment and embodiment 2 is that an equal amount of polypropylene is used in the photosensitive resin matrix instead of polyester resin, and the other raw material types, amounts and test parameters are consistent with those in embodiment 1.

[0095] The weight average molecular weight of polypropylene is 700,000 and the melting point is 174°C.

[0096] Comparative Example

[0097] Comparative Example 1

[0098] A photosensitive thread. The difference between this comparative example and Example 1 is that PET slices are replaced with an equal amount of polybutylene terephthalate, and the remaining raw material types, amounts and test parameters are consistent with those in Example 1.

[0099] The melting point of polybutylene terephthalate is 225°C, the crystallinity is 30%, the glass transition temperature is 42°C, and the tensile strength is 50 MPa.

[0100] Comparative Example 2

[0101] A photosensitive thread. The difference between this comparative example and Example 1 is that the acetate fiber is replaced by an equal amount of polyamide fiber, and the remaining raw material types, amounts and test parameters are consistent with those in Example 1.

[0102] The relative molecular weight of polyamide fiber is 18000.

[0103] Comparative Example 3

[0104] A photosensitive thread. The difference between this comparative example and Example 1 is that the maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer is replaced by an equal amount of methyl vinyl ether-maleic anhydride copolymer, and the remaining raw material types, amounts and test parameters are consistent with Example 1.

[0105] The boiling point of methyl vinyl ether-maleic anhydride copolymer is 202°C and the average molecular weight is 216,000.

[0106] Performance testing

[0107] The photosensitive yarns prepared in Examples 1-6 and Comparative Examples 1-3 were woven into a 250 g / m 3 The photosensitive fabrics were tested for photosensitivity uniformity, photosensitivity change, air permeability and softness.

[0108] Detection method / test method

[0109] Observation of photosensitivity uniformity: Place the photosensitive fabrics prepared from the photosensitive threads of Examples 1-6 and Comparative Examples 1-3 under light to observe whether the photosensitive fabrics have color unevenness or lumps.

[0110] Photosensitivity change test: The photosensitive fabrics prepared from the photosensitive threads in Example 1 are divided into four groups: A, B, C, and D. The photosensitive fabrics of groups B, C, and D are placed in a washing machine respectively. Glacial acetic acid (pH value of the washing machine is 4) is added to group B, 5% NaOH solution (pH value of the washing machine is 10) is added to group C, and 100 ml of acetone is added to group D. The fabrics are washed repeatedly for 100 times to compare whether the photosensitivity effects of groups A and B, groups A and C, and groups A and D have changed, and whether breakage occurs. The same method is used in Examples 2-7 and Comparative Examples 1-4.

[0111] Air permeability test: refer to GB / T 5453-1997 standard to conduct air permeability test on photosensitive fabrics.

[0112] Softness test: The softness of photosensitive fabrics was tested according to the test method of EDA NAWSP 90.3.(05).

[0113] The test data are shown in Table 3:

[0114] Table 3 Performance test data

[0115]

[0116]

[0117] The smaller the softness value, the better the softness.

[0118] It can be seen from Examples 1-7 and Comparative Examples 1-4 in combination with Table 3 that the photosensitive thread prepared by the formula and preparation method of the present application is used to prepare photosensitive fabrics, and the photosensitive color change is uniform and long-lasting, and is not easily damaged. At the same time, the photosensitive fabrics prepared with the photosensitive thread have good air permeability and softness, and are more suitable for clothing worn by people.

[0119] Compared with Example 1 and Comparative Example 1, Example 1 has no change in the photosensitive color after repeated washing in a washing machine, and has good air permeability and good softness; while in Comparative Example 1, the photosensitive uniformity observation shows uneven color, and the photosensitive color changes and has cracks after repeated washing in a washing machine, and has poor air permeability and poor softness, indicating that the use of PET slices can play a good synergistic role with the photosensitive resin matrix, acetate fiber and compatibilizer, and further improve the smoothness, strength, air permeability and softness of the photosensitive thread, so that the photosensitive fabric prepared with the photosensitive thread has a uniform photosensitive color, can be maintained for a long time, and has good air permeability and good softness.

[0120] Compared with Example 1 and Comparative Example 2, Example 1 has no change in the photosensitive color after repeated washing in a washing machine, and has good air permeability and good softness; while in Comparative Example 2, the photosensitive uniformity observation shows uneven color, and the photosensitive color changes and has cracks after repeated washing in a washing machine, and has poor air permeability and poor softness, indicating that the use of acetate fiber can play a good synergistic role with the photosensitive resin matrix, acetate fiber, PET slices and compatibilizer, and further improve the smoothness, strength, air permeability and softness of the photosensitive thread, so that the photosensitive fabric prepared with the photosensitive thread has a uniform photosensitive color, can be maintained for a long time, and has good air permeability and good softness.

[0121] Compared with Example 1 and Comparative Example 3, Example 1 has no change in the photosensitive color after repeated washing in the washing machine, and has good air permeability and good softness; while in Comparative Example 2, the photosensitive uniformity observation shows uneven color and lumps, and the photosensitive color changes and has cracks after repeated washing in the washing machine, and has poor air permeability and poor softness, indicating that the use of a compatibilizer can improve the compatibility of the photosensitive resin matrix, acetate fiber and PET slices, and further improve the smoothness, strength, air permeability and softness of the photosensitive thread, so that the photosensitive fabric prepared with the photosensitive thread has a uniform photosensitive color, can be maintained for a long time, and has good air permeability and softness.

[0122] Compared with Example 1 and Example 2-4, groups B, C, and D in Example 1 all have cracks, while groups B, C, and D in Example 2-4 have no cracks. The air permeability and softness of Example 2-4 are better than those of Example 1, indicating that the modified acetate fiber prepared by the present application is used to prepare photosensitive threads, and the photosensitive threads are then used to prepare photosensitive fabrics, which can improve the acid and alkali resistance, organic resistance, softness and air permeability of the photosensitive fabrics and facilitate the care of the fabrics.

[0123] Compared with Example 2 and Example 5, the photosensitive color in Example 5 is uneven, which shows that the effect of polyester polyol can improve the adhesion between ester resin and photosensitive material, so that the photosensitive material can be evenly distributed in the photosensitive resin matrix, thereby improving the color effect of the photosensitive thread.

[0124] Compared with Example 2 and Example 6, the photosensitive color in Example 6 is uneven, which means that preparing the photosensitive resin matrix by melting the photosensitive material, polyester polyol and polyester resin in a reasonable ratio is beneficial to the uniform distribution of the photosensitive material and its long-term retention in the photosensitive thread.

[0125] 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, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A photosensitive thread, characterized in that: The photosensitive thread is prepared by including the following raw materials in parts by weight: 5-15 parts of photosensitive resin matrix PET slices 10-20 pieces 1-2 parts of compatibilizer 10-15 parts of acetate Other additives 0-1 part Each portion of the photosensitive resin matrix is ​​prepared by melting a photosensitive material, a polyester polyol and a polyester resin in a weight ratio of 3: (10-15): (20-35); The acetate fiber is modified acetate fiber, which is prepared by the following method: A: Dissolve cellulose acetate in glacial acetic acid to obtain cellulose acetate solution; B: dissolving lignin in a sulfite solution to obtain a lignin-sulfite solution, then adding acrylic acid to the lignin-sulfite solution, raising the temperature to 50-60°C, adding hydrogen peroxide-ferrous sulfate dropwise to react, precipitating, filtering, and obtaining modified lignin; C: Add the modified lignin to the acetate fiber solution, stir, heat to 70-80°C, then add 3-phenylpropionyl chloride and epichlorohydrin, react for 4-5h, cool to 20-30°C, add triethylamine dropwise to adjust the pH to 6.5-7.5, filter, and dry to obtain modified acetate fiber; The weight parts of materials used in the modified acetate fiber are as follows: 30-40 parts of acetate 200-300 parts of glacial acetic acid Lignin 10-15 parts Sulfite solution 40-60 parts Acrylic acid 15-20 parts Hydrogen peroxide-ferrous sulfate 1-2 parts 3-5 parts of 3-phenylpropionyl chloride Epichlorohydrin 4-8 parts 50-100 parts of triethylamine; The other auxiliary agent is at least one of an antioxidant, an anti-aging agent and an antistatic agent; The polyester resin has an acid value of 30-36 mgKOH / g, a softening point of 103-113° C., the softening point is measured by the ring and ball method, a glass transition temperature of 60° C., and a melt viscosity of 5000-8000 mPa•s, the melt viscosity is measured at 200° C. using the ICI standard; The functionality of the polyester polyol is 2-3 and the average molecular weight is 2000-4000; The compatibilizer is one of a copolymer of maleic anhydride grafted acrylonitrile-butadiene-styrene, a copolymer of glycidyl methacrylate grafted acrylonitrile-butadiene-styrene, or a copolymer of glycidyl methacrylate grafted styrene acrylonitrile.

2. A photosensitive thread according to claim 1, characterized in that: The photosensitive material is at least one of indoline spiropyran, 1,4-dihydroxyanthraquinone, 2-(2,4-dinitrobenzyl)pyridine and salicylanilide.

3. A method for preparing the photosensitive thread according to any one of claims 1 to 2, characterized in that: The method comprises the following preparation steps: S1. Mix, extrude and granulate PET slices, compatibilizer, photosensitive resin matrix, cellulose acetate and other additives according to parts by weight to obtain photosensitive masterbatch; S2. Under nitrogen protection, the photosensitive masterbatch is extruded and spun, the total supply of the spinning metering pump is controlled to be 450-500g / min, the spinning temperature is 240-250℃, the spinning speed is 800-1000m / min, and the drafting multiple is 2-2.5 times to obtain the photosensitive silk thread.

4. The method for preparing the photosensitive thread according to claim 3, characterized in that: The temperatures in the extrusion step in S1 are: 210-220°C in zone I, 220-230°C in zone II, 230-240°C in zone III, 220-230°C in zone IV, and 210-220°C in zone V.

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