Digital jet printing ink for degradable fiber material and preparation method thereof

Abstract

The invention provides digital jet printing ink for a degradable fiber material and a preparation method thereof, and relates to the technical field of digital jet printing ink, the digital jet printing ink comprises a disperse dye compound, a composite additive system and water; the compound additive system comprises at least one of a dispersing agent, a humectant and a wetting agent; the disperse dye compound is selected from specific disperse dye compounds with moderate molecular weight and strong low-temperature mobility. The digital jet printing ink is specially used for jet printing of degradable fiber materials, can fix color at the low temperature of 150-160 DEG C or below, has excellent color expression, fastness and environmental protection characteristics, and is very suitable for digital jet printing of green materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of digital inkjet ink, in particular to a digital inkjet ink for degradable fiber materials and a preparation method thereof. BACKGROUND

[0002] With the increasing strictness of global environmental protection regulations (such as the EU REACH and OEKO-TEX standards), the demand for degradable, low-carbon circular fiber materials (such as polylactic acid PLA, polyether-modified polyester, etc.) in the textile industry is rapidly growing. However, digital inkjet printing of such fiber materials still faces key technical bottlenecks: (1) Compatibility problem of degradable fiber material fabric and traditional ink The glass transition temperature (Tg) of PLA (polylactic acid) fiber is relatively low (about 60-65℃), and it has poor heat resistance. High-temperature fixing (≥180℃) of traditional dispersion ink can easily cause the cooled hardening, deformation or even degradation after reshaping; Although polyether-modified polyester zero-carbon fabrics (such as NEDDP, etc.) have good elasticity and high hydrophilicity, high-temperature fixing can damage their molecular structure and affect their mechanical properties; (2) Limitations of existing dispersion ink High-temperature dependence: Commercially available dispersion inks (such as Huntsman, DyStar, DuPont, etc.) usually require 180-210℃ heat fixing, which is far beyond the tolerance limit of degradable fiber materials / fabrics; Insufficient fastness: At low-temperature fixing (<150℃~160℃), traditional dispersion dyes are difficult to penetrate fully, resulting in a general water washing fastness (ISO 105-C06) of ≤3 grade, which cannot meet commercial requirements; Poor environmental compatibility: Although the fastness is improved by adding cross-linking agents, the biodegradability of the fabric is damaged by the formaldehyde or heavy metal-containing additives; (3) Analysis of existing technologies Low-temperature fixing ink attempt: Existing technology CN113293548A proposes to use modified dispersion dyes to reduce the fixing temperature, but it is only suitable for polyester and has poor color strength for PLA; existing technology CN114457536A uses a low-temperature adhesive to assist fixing, but it can block the inkjet head and affect the fabric hand; Development of environmentally friendly ink: Existing technology CN115261853B reports the application of bio-based dispersants, but does not solve the fastness problem at low-temperature fixing; existing technology CN116003945A uses microcapsule dye release technology, but the process is complex and the cost is high.

[0003] Currently, there are no low-temperature curing dispersion inks specifically designed for biodegradable fiber materials on the market. Existing products require a compromise in application: lowering the curing temperature at the expense of colorfastness (washing / rubbing fastness ≤ 2-3). Reactive / acidic inks are used, but they are only suitable for some natural fibers and cannot be matched with synthetic biodegradable fabrics (such as PLA). In view of this, the present invention is hereby proposed. Summary of the Invention

[0004] One of the objectives of this invention is to provide a digital inkjet printing ink for biodegradable fiber materials that can be fixed at low temperatures of ≤150℃~160℃ and has excellent color performance, fastness and environmental protection characteristics, making it very suitable for digital printing of green textile fiber materials.

[0005] The second objective of this invention is to provide a method for preparing digital inkjet printing ink for biodegradable fiber materials, which is simple, efficient, has a high success rate, and is suitable for industrial production.

[0006] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted: In a first aspect, a digital inkjet printing ink for biodegradable fibrous materials comprises the following components: Disperse dye compounds, composite auxiliary agent systems, and water; The composite additive system includes at least one of a dispersant, a humectant, and a wetting agent.

[0007] The disperse dye compound is selected from at least one of the following compounds: (Formula 1) (Formula 2) (Formula 3) (Formula 4) (Formula 5) (Formula 6) (Formula 7) (Equation 8) (Formula 9) (Formula 10) (Formula 11) (Equation 12) (Equation 13).

[0008] Furthermore, the dispersant includes at least one of the following: polycarboxylate ammonium salt polymeric dispersant, polycarboxylate sulfonate polymeric dispersant, lignin sulfonate, naphthalene sulfonic acid formaldehyde condensate, polystyrene-maleic acid copolymer dispersant, acrylic acid-maleic acid copolymer, and styrene-phenol polyoxyethylene ether. Preferably, the mass ratio of the dispersant to the disperse dye compound is 0.3 to 2:1.

[0009] Furthermore, the humectant includes at least one of ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, pentaerythritol, glycerol, sorbitol, and polyethylene glycol.

[0010] Furthermore, the wetting agent includes at least one of Surfynol 104E, Surfynol 465, BYK-348, TS-5060, and TS-5100.

[0011] Furthermore, the components of the digital inkjet ink also include bactericides and preservatives; Preferably, the bactericidal preservative includes at least one selected from 2-benzisothiazolin-3-one, methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, 2-methyl-4,5-propylidene-4-isothiazolin-3-one, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, and 2-methyl-5-chloro-4-isothiazolin-3-one.

[0012] Furthermore, the digital inkjet ink comprises the following components by weight percentage: The composition includes 0.1%-15% disperse dye compound, 0.1%-30% dispersant, 10%-60% humectant, 0.05%-5% wetting agent, 0.01%-0.5% bactericide and preservative, and 25%-85% water.

[0013] Furthermore, the particle size D50 of the digital inkjet ink is 40nm-200nm, the particle size D90 is 100nm-300nm, and the particle size distribution coefficient DPI ≤ 0.3.

[0014] Furthermore, the biodegradable fiber material includes at least one of polyether-modified hydrophilic polyester (NEDDP) fiber, polylactic acid (PLA) fiber, polybutylene succinate (PBS) fiber, polyhydroxyalkanoate (PHA) fiber, and polybutylene adipate / terephthalate (PBAT) fiber.

[0015] Secondly, a method for preparing the digital inkjet printing ink described in any of the above claims includes the following steps: The components are mixed in proportion to obtain the digital inkjet printing ink.

[0016] Furthermore, the preparation method includes the following steps: The disperse dye compound, dispersant, and some water are mixed and ground, and then the remaining water, humectant, wetting agent, and bactericide and preservative are added and mixed to obtain the digital inkjet printing ink.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: The digital inkjet printing ink for biodegradable fiber materials provided by this invention ensures deep penetration into biodegradable fiber materials (such as PLA / NEDDP) through the careful selection of specific disperse dye compounds with moderate molecular weight and strong low-temperature migration. The composite auxiliary agent system used can avoid high-temperature damage to the fabric structure because biodegradable fiber materials have a looser structure and a lower glass transition temperature. With the synergistic effect of each component, the digital inkjet printing ink of this invention can be heat-fused and fixed at a low temperature of ≤150℃~160℃, and has excellent color performance, fastness and environmental protection characteristics, making it very suitable for digital printing of green textiles.

[0018] The method for preparing digital inkjet printing ink for biodegradable fiber materials provided by this invention is simple, efficient, and has a high success rate, making it suitable for industrial production. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] According to a first aspect of the present invention, a digital inkjet printing ink for biodegradable fibrous materials is provided, comprising the following components: Disperse dye compounds, composite auxiliary agent systems, and water; The composite additive system includes at least one of dispersants, humectants, and wetting agents; Disperse dye compounds are selected from at least one of the following compounds: (Formula 1) (Formula 2) (Formula 3) (Formula 4) (Formula 5) (Formula 6) (Formula 7) (Equation 8) (Formula 9) (Formula 10) (Formula 11) (Equation 12) (Equation 13).

[0021] This invention ensures deep penetration into biodegradable fiber materials (such as PLA / NEDDP) by using specific disperse dye compounds with moderate molecular weight and strong low-temperature migration; the composite auxiliary system used can avoid high-temperature damage to the fabric structure.

[0022] With the synergistic effect of its components, the digital inkjet printing ink of this invention can be fixed at low temperatures of ≤150℃~160℃, and has excellent color performance, fastness and environmental protection characteristics, making it very suitable for digital printing of green textiles.

[0023] In a preferred embodiment, the dispersant includes, but is not limited to, at least one of polycarboxylate ammonium salt polymeric dispersants, polycarboxylate sulfonate polymeric dispersants, lignin sulfonate, naphthalene sulfonic acid formaldehyde condensate, polystyrene-maleic acid copolymer dispersants, acrylic acid-maleic acid copolymers, and styrene-phenol polyoxyethylene ether.

[0024] In this invention, the mass ratio of dispersant to disperse dye compound can be 0.3 to 2:1, and typical but non-limiting mass ratios are, for example, 0.3:1, 0.5:1, 0.7:1, 0.9:1, 1.1:1, 1.3:1, 1.5:1, 1.7:1, and 2:1.

[0025] In a preferred embodiment, the humectant includes, but is not limited to, at least one of ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, pentaerythritol, glycerol, sorbitol, and polyethylene glycol.

[0026] In a preferred embodiment, the wetting agent includes, but is not limited to, at least one of Surfynol 104E, Surfynol 465, BYK-348, TS-5060, and TS-5100.

[0027] The composite auxiliary agent system uses biodegradable dispersants (such as polyglycerol esters) and low-temperature dyeing accelerators, which helps to avoid high-temperature damage to the fabric structure.

[0028] In a preferred embodiment, the components of the digital inkjet ink also include, but are not limited to, bactericides and preservatives.

[0029] The bactericidal preservatives include, but are not limited to, at least one of 2-benzisothiazolin-3-one (BIT), methyl-4-isothiazolin-3-one (MIT), 5-chloro-2-methyl-4-isothiazolin-3-one (CIT), 2-n-octyl-4-isothiazolin-3-one (OIT), 2-methyl-4,5-propylidene-4-isothiazolin-3-one (MTI), 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT), 2-methyl-4-isothiazolin-3-one (MI), and 2-methyl-5-chloro-4-isothiazolin-3-one (CMI).

[0030] In a preferred embodiment, the digital inkjet ink comprises the following components by weight percentage: The composition includes 0.1%-15% disperse dye compound, 0.1%-30% dispersant, 10%-60% humectant, 0.05%-5% wetting agent, 0.01%-0.5% bactericide and preservative, and 25%-85% water.

[0031] Typical, but not limiting, mass percentages of disperse dye compounds are, for example, 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, and 15%; typical, but not limiting, mass percentages of dispersants are, for example, 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, and 27%. 28%, 29%, 30%; typical but non-limiting mass percentages of humectants, such as 10%, 20%, 30%, 40%, 50%, 60%; typical but non-limiting mass percentages of wetting agents, such as 0.05%, 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%; typical but non-limiting mass percentages of bactericides and preservatives, such as 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%; typical but non-limiting mass percentages of water, such as 25%, 35%, 45%, 55%, 65%, 75%, 85%.

[0032] In summary, this invention, through the synergistic combination of its components and their proportions, overcomes the technical barrier of low-temperature color fixing while taking into account the physical properties of biodegradable fiber materials. It can fix colors at low temperatures of ≤150℃~160℃, exhibiting excellent color performance, fastness, and environmental protection characteristics, and is suitable for digital printing of green textiles.

[0033] In a preferred embodiment, the biodegradable fiber material includes, but is not limited to, at least one of polyether-modified hydrophilic polyester (NEDDP) fiber, polylactic acid (PLA) fiber, polybutylene succinate (PBS) fiber, polyhydroxyalkanoate (PHA) fiber, and polybutylene adipate / terephthalate (PBAT) fiber.

[0034] According to a second aspect of the present invention, a method for preparing the digital inkjet printing ink described in any of the preceding claims is provided, comprising the following steps: The components are mixed in proportion to obtain digital inkjet printing ink.

[0035] The present invention provides a method for preparing digital inkjet printing ink for biodegradable fiber materials. The process is simple, efficient, and has a high success rate, making it suitable for industrial production.

[0036] In a preferred embodiment, the preparation method of the present invention includes the following steps: The disperse dye compound, dispersant, and some water are mixed and ground together. Then, the remaining water, humectant, wetting agent, and bactericide / preservative are added and mixed to obtain digital inkjet printing ink.

[0037] The disperse dye compound, dispersant, and a portion of deionized water are mixed and ground (grinding is performed sequentially by stirring and dispersing, coarse grinding, and fine grinding) to the required particle size. Then, the remaining proportion of deionized water, humectant, wetting agent, bactericide, and preservative are added and thoroughly mixed to obtain digital inkjet printing ink.

[0038] The present invention will be further illustrated by the following examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or purchased directly from the market.

[0039] Examples 1-6 Examples 1-6 provide a digital inkjet printing ink for biodegradable fiber materials, and the components and their proportions are shown in Table 1.

[0040] Table 1

[0041] The disperse dye compounds used in Examples 1-6 are: (Equation 4), (Equation 10), (Equation 11), 5% (Equation 1) + 1% (Equation 4) + 4% (Equation 13), (Equation 2), (Equation 9); (Equation 1); (Equation 2); (Equation 4); (Equation 9); (Equation 10); (Equation 11); (Equation 13); The dispersant is a polycarboxylic acid ammonium salt polymeric dispersant, the humectant is ethylene glycol, the wetting agent is Surfynol 104E, and the bactericide and preservative is 2-benzisothiazolin-3-one (BIT).

[0042] In Examples 1-6, the particle size D50 of the digital inkjet ink is <100nm, the particle size D90 is <180nm, and the particle size distribution coefficient DPI is ≤0.3.

[0043] Example 7 This embodiment provides a digital inkjet printing ink for biodegradable fabrics, differing from Embodiment 4 only in that the disperse dye compound used is... (Equation 3); Meanwhile, the printing material uses NEDDP fiber zero-carbon fabric; Everything else is the same as in Example 4.

[0044] Example 8 This embodiment provides a digital inkjet printing ink for biodegradable fabrics, differing from Embodiment 4 only in that the disperse dye compound used is... (Equation 8); Meanwhile, the printing material uses PBS fiber fabric; Everything else is the same as in Example 4.

[0045] Example 9 This embodiment provides a digital inkjet printing ink for biodegradable fabrics. The only difference from Embodiment 4 is that the disperse dye compound used is 5% (Formula 5) + 1% (Formula 6) + 4% (Formula 7). (Equation 5); (Formula 6); (Equation 7); Meanwhile, the printing material uses PBAT fiber fabric; Everything else is the same as in Example 4.

[0046] Example 10 This embodiment provides a digital inkjet printing ink for biodegradable fabrics. The only difference from Embodiment 4 is that the mass percentage of the disperse dye compound is 17%, and the amount of deionized water used is reduced accordingly. Everything else is the same as in Example 4.

[0047] Example 11 This embodiment provides a digital inkjet printing ink for biodegradable fabrics. The only difference from Embodiment 4 is that the mass percentage of the dispersant is 32%, the amount of deionized water is reduced accordingly, and the printing material is PHA fiber fabric. Everything else is the same as in Example 4.

[0048] Example 12 This embodiment provides a digital inkjet printing ink for biodegradable fabrics. The only difference from Embodiment 4 is that the mass percentage of the humectant is 8%, and the amount of deionized water is increased accordingly. Everything else is the same as in Example 4.

[0049] Example 13 This embodiment provides a digital inkjet printing ink for biodegradable fabrics. The only difference from Embodiment 4 is that the mass percentage of the humectant is 65%, and the amount of deionized water used is reduced accordingly. Everything else is the same as in Example 4.

[0050] Example 14 This embodiment provides a digital inkjet printing ink for biodegradable fabrics. The only difference from Embodiment 4 is that the wetting agent has a mass percentage of 7%, and the amount of deionized water used is reduced accordingly. Everything else is the same as in Example 4.

[0051] Example 15 This embodiment describes the preparation method of the digital inkjet printing ink of Embodiments 1-14, including the following steps: The disperse dye compound, dispersant, and a portion of deionized water are mixed and ground to the required particle size. Then, the remaining proportion of deionized water, humectant, wetting agent, bactericide, and preservative are added to obtain a digital inkjet printing ink for biodegradable fabrics.

[0052] Comparative Example 1 This comparative example provides a digital inkjet printing ink, which differs from Example 4 only in that the disperse dye compound used is 4% CI Disperse Blue 291:1 + 4% CI Disperse Orange 288 + 2% CI Disperse Violet 93. Everything else is the same as in Example 4; The preparation method is described in Example 15.

[0053] Comparative Example 2 This comparative example provides a digital inkjet printing ink, which differs from Example 4 only in that the disperse dye compound used is 4% CI Disperse Blue 79 + 4% CI Disperse Orange 44 + 2% CI Disperse Violet 93. Everything else is the same as in Example 4; The preparation method is described in Example 15.

[0054] Comparative Example 3 This comparative example provides a digital inkjet printing ink, which differs from Example 4 only in that no dispersant is added and the ink is made up with an equal amount of water. Everything else is the same as in Example 4; The preparation method is described in Example 15.

[0055] Comparative Example 4 This comparative example provides a digital inkjet printing ink, which differs from Example 4 only in that no humectant is added and the ink is made up with an equal amount of water. Everything else is the same as in Example 4; The preparation method is described in Example 15.

[0056] Comparative Example 5 This comparative example provides a digital inkjet printing ink, which differs from Example 4 only in that no wetting agent is added, and the ink is made up with an equal amount of water. Everything else is the same as in Example 4; The preparation method is described in Example 15.

[0057] Test case The performance of the digital inkjet inks of Examples 1-14 and Comparative Examples 1-5 was tested, and the results are shown in Tables 2 and 3.

[0058] Performance testing methods: Ink stability test and printing smoothness test: The prepared ink was placed in low temperature (0-4℃) and high temperature (60℃) environments for 7 days respectively. If the change rate of particle size and viscosity was less than 20%, it was considered stable. The ink printing smoothness evaluation method is as follows: the prepared ink is continuously inkjet printed through the printer for 50㎡ without ink breaks and for 90㎡ with ink breaks <5 pins, which is considered to be excellent continuity; ink breaks start to appear at 50㎡ but are less than 5 pins, which is considered to be good continuity; ink breaks start to appear at 50㎡ but are more than 5 pins, which is considered to be ink breakage; ink breaks >10 pins at 50㎡ are considered to be severe ink breakage.

[0059] Performance evaluation of printing materials: The prepared ink was used to directly print color blocks onto PLA polylactic acid fabric using a digital printer, with full ink volume selected for all printing. After printing, the resulting color block sample is heated at 150℃ for 2 minutes, then the fabric is soaped and washed, and finally the fabric is tested for rubbing fastness, washing stain fastness, and fabric hand feel. The test method for color fastness to rubbing shall be performed in accordance with ISO-105-X12 standard, and the test method for color fastness to washing shall be performed in accordance with ISO-105-C10 standard. The method for evaluating fabric hand feel is as follows: After inkjet printing, color development, and thorough washing and drying, the fabric is subjected to a drape test. The test method is in accordance with the national standard GB / T 23329-2009. The standard is compared with the initial unprinted fabric. A drape coefficient change rate ≤5% is defined as no change, a drape coefficient change rate >5% and ≤10% is defined as small change, and a change rate >10% is defined as stiffening.

[0060] Table 2

[0061] Table 3

[0062] In summary, the digital inkjet printing ink of this invention not only has a uniform particle size distribution, excellent printing smoothness, and good stability, but also produces vibrant colors and exhibits superior fabric fastness properties such as rubbing fastness and washing fastness when applied to digital inkjet printing or dyeing of recyclable and biodegradable environmentally friendly fabrics such as polyether modified hydrophilic polyester (NEDDP) fiber, polylactic acid (PLA) fiber, polybutylene succinate (PBS) fiber, polyhydroxyalkanoate (PHA) fiber, and polybutylene adipate / terephthalate (PBAT) fiber.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A digital inkjet printing ink for biodegradable fiber materials, characterized in that, Includes the following components: Disperse dye compounds, composite auxiliary agent systems, and water; The composite additive system includes at least one of dispersant, humectant and wetting agent; The disperse dye compound is selected from at least one of the following compounds: (Formula 1) (Formula 2) (Formula 3) (Formula 4) (Formula 5) (Formula 6) (Formula 7) (Equation 8) (Formula 9) (Formula 10) (Formula 11) (Equation 12) (Equation 13).

2. The digital inkjet printing ink according to claim 1, characterized in that, The dispersant includes at least one of the following: polycarboxylate ammonium salt polymeric dispersant, polycarboxylate sulfonate polymeric dispersant, lignin sulfonate, naphthalene sulfonic acid formaldehyde condensate, polystyrene-maleic acid copolymer dispersant, acrylic acid-maleic acid copolymer, and styrene-phenol polyoxyethylene ether. Preferably, the mass ratio of the dispersant to the disperse dye compound is 0.3 to 2:

1.

3. The digital inkjet printing ink according to claim 2, characterized in that, The humectant includes at least one of ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, pentaerythritol, glycerol, sorbitol, and polyethylene glycol.

4. The digital inkjet printing ink according to claim 3, characterized in that, The wetting agent includes at least one of Surfynol 104E, Surfynol 465, BYK-348, TS-5060, and TS-5100.

5. The digital inkjet printing ink according to any one of claims 1-4, characterized in that, The components of the digital inkjet ink also include bactericides and preservatives; Preferably, the bactericidal preservative includes at least one selected from 2-benzisothiazolin-3-one, methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, 2-methyl-4,5-propylidene-4-isothiazolin-3-one, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, and 2-methyl-5-chloro-4-isothiazolin-3-one.

6. The digital inkjet printing ink according to claim 5, characterized in that, The digital inkjet ink comprises the following components by weight percentage: The composition includes 0.1%-15% disperse dye compound, 0.1%-30% dispersant, 10%-60% humectant, 0.05%-5% wetting agent, 0.01%-0.5% bactericide and preservative, and 25%-85% water.

7. The digital inkjet printing ink according to claim 6, characterized in that, The digital inkjet ink has a particle size D50 of 40nm-200nm, a particle size D90 of 100nm-300nm, and a particle size distribution coefficient DPI ≤ 0.

3.

8. The digital inkjet printing ink according to claim 1, characterized in that, The biodegradable fiber material includes at least one of polyether-modified hydrophilic polyester fiber, polylactic acid fiber, polybutylene succinate fiber, polyhydroxyalkanoate fiber, and polybutylene adipate / terephthalate fiber.

9. A method for preparing the digital inkjet printing ink according to any one of claims 1-8, characterized in that, Includes the following steps: The components are mixed in proportion to obtain the digital inkjet printing ink.

10. The preparation method according to claim 9, characterized in that, The preparation method includes the following steps: The disperse dye compound, dispersant, and some water are mixed and ground, and then the remaining water, humectant, wetting agent, and bactericide and preservative are added and mixed to obtain the digital inkjet printing ink.

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