Tencel digital printing process

Abstract

According to the tencel digital printing technology, light irradiation is adopted for curing, coating ink is selected, the technological process is shortened, water consumption, energy consumption and pollution discharge are greatly reduced, and the tencel digital printing technology has good industrialization prospects. According to the preparation method, firstly, the surface of the tencel fabric is pretreated, so that the surface of the tencel fabric is functionalized, the tencel fabric can be chemically bonded with active substances in ink, including urethane acrylate oligomer and free radical reactive diluent, a sandwich structure is formed, pigment is embedded between the fabric and a polymer film, and the adhesion stability of the pigment is greatly improved; the color fastness is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of digital fabric printing, and in particular relates to a Tencel digital printing process. Background Art

[0002] Tencel is a pure natural regenerated fiber. It is developed by Acordis Company of the United Kingdom with 100% natural wood pulp extracted from trees as raw materials and is called "the fiber dream of the 21st century". It is softer than silk, more hygroscopic than cotton, thin, easy to wash and dry. However, the cortical structure of Tencel fiber is very thin, close to the whole core structure, and water molecules can be quickly absorbed by the holes between nanofibrils. Therefore, when using reactive dye inkjet printing, the ink droplets will be seriously infiltrated, affecting the outline clarity of the print. Although surface modification of Tencel fabric before reactive dye inkjet printing can control the distribution of ink droplets on the fabric surface and improve the inkjet printing effect, reactive dye inkjet printing also includes a series of high-energy, high-water consumption, and high-pollution post-processing sections such as steaming, washing, and soaping. Therefore, it is of great significance to improve the inkjet printing process of Tencel fabric, improve printing efficiency, printing effect, and reduce energy consumption.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The invention provides a Tencel digital printing process, which has the advantages of short process flow, high production efficiency, low energy consumption and low pollution, and high printing clarity, high apparent color depth and high color fastness.

[0005] The present invention is achieved through the following technical solutions:

[0006] A Tencel digital printing process comprises the following steps:

[0007] (1) dissolving an acryloyl chloride compound in a solvent to obtain a pretreatment solution;

[0008] (2) applying the pretreatment liquid to the surface of the Tencel fabric;

[0009] (3) drying;

[0010] (4) preparing a pigment printing ink, wherein the pigment printing ink comprises a polyurethane acrylate oligomer, a free radical active diluent, a photoinitiator, and a pigment;

[0011] (5) digital inkjet printing to obtain digital inkjet printed fabric;

[0012] (6) Photocuring

[0013] In some embodiments of the present invention, the acryloyl chloride compound includes at least one of methacryloyl chloride, 3-methylcrotonoyl chloride, or crotonoyl chloride.

[0014] In some embodiments of the present invention, the boiling point of the solvent is lower than 120° C.; preferably, the solvent is acetonitrile, dichloromethane, ethyl acetate or acetone.

[0015] In some embodiments of the present invention, the mass percentage of the acryloyl chloride compound in the pretreatment liquid is 2% to 8%.

[0016] In some embodiments of the present invention, the fabric pretreatment is performed by dipping, padding, spraying or coating.

[0017] In some embodiments of the present invention, the drying temperature is 90-150° C. and the drying time is 3-6 hours.

[0018] In some embodiments of the present invention, the pigment printing ink comprises, calculated by mass percentage, 30% to 50% of polyurethane acrylate oligomer, 47% to 68% of free radical active diluent, 0.5% to 1% of photoinitiator, and 1% to 2% of pigment.

[0019] In some embodiments of the present invention, the polyurethane acrylate oligomer includes a polysiloxane segment; further, the preparation method of the polyurethane acrylate oligomer is as follows: a double-terminal alcohol hydroxyl silicone oil is subjected to a prepolymerization reaction with a difunctional isocyanate, and then 1,4-diamino-2-butene is added for chain extension reaction, and finally hydroxyethyl methacrylate is added for end-capping to obtain a polyurethane acrylate oligomer.

[0020] In some embodiments of the present invention, the polyurethane acrylate oligomer includes a polysiloxane segment and a polyether segment; further, the preparation method of the polyurethane acrylate oligomer is as follows: a double-terminal hydroxy silicone oil, a polyether polyol and a difunctional isocyanate are prepolymerized to obtain a silicone oil prepolymer and a polyether polyol prepolymer, 1,4-diamino-2-butene is added to the silicone oil prepolymer for chain extension reaction, and then a polyethylene glycol prepolymer is added to continue the reaction, and finally hydroxyethyl methacrylate is added for end-capping to obtain a polyurethane acrylate oligomer.

[0021] In some embodiments of the present invention, the difunctional isocyanate is at least one of isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate or hexamethylene diisocyanate.

[0022] In some embodiments of the present invention, the viscosity of the polyurethane acrylate oligomer is ≤2.5 Pa·s.

[0023] In some embodiments of the present invention, the pigment is a vinyl silane coupling agent surface-modified pigment; preferably, the vinyl silane coupling agent is at least one of vinyl trimethoxy silane, vinyl triethoxy silane and γ-methacryloxypropyl trimethoxy silane.

[0024] In some embodiments of the present invention, the method for preparing a vinyl silane coupling agent surface-modified pigment is as follows: dispersing the pigment in an aqueous solution of a vinyl silane coupling agent, adding an acid or a base and stirring the reaction, performing solid-liquid separation, washing, and drying to obtain a vinyl silane coupling agent surface-modified pigment.

[0025] In some embodiments of the present invention, the free radical active diluent is at least one of ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, isooctyl (meth)acrylate, hydroxyethyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentenyl acrylate, and hydroxypropyl (meth)acrylate.

[0026] In some embodiments of the present invention, the photoinitiator is at least one of an aromatic ketone initiator, an α-hydroxyalkyl phenone initiator, a thioxanthone derivative and an organic metallocene initiator; preferably, the photoinitiator is one of camphorquinone, benzoin dimethyl ether, α-hydroxycyclohexyl benzophenone, and isopropyl thioxanthone.

[0027] In some embodiments of the present invention, light curing refers to radiation curing of digital inkjet printed fabrics using light with a wavelength of 200 to 480 nm.

[0028] The present invention has the following advantages and beneficial effects:

[0029] (1) The present invention provides a Tencel digital printing process, which uses light irradiation for curing and selects coating ink, shortens the process flow, and greatly reduces water and energy consumption and pollution discharge, and has good industrial prospects.

[0030] (2) The present invention provides a Tencel digital printing process, first pre-treating the surface of the Tencel fabric to functionalize the surface, so that it can be chemically bonded with the active substances in the ink including polyurethane acrylate oligomers and free radical active diluents, forming a sandwich structure to embed the pigment between the fabric and the polymer film, greatly improving the adhesion stability of the pigment and improving the color fastness. Furthermore, the same functional group is used to modify the surface of the pigment, so that the pigment participates in the chemical bonding, improving the compatibility between the pigment and the polymer film, and can further improve the color fastness of the printing.

[0031] (3) The polyurethane acrylate oligomer contained in the digital inkjet printing ink provided by the present invention contains silicone oil segments and / or polyether segments, has good softness, and by adjusting the relative content of the soft and hard segments of the polyurethane acrylate oligomer in the ink, as well as its content ratio with the free radical active diluent, the viscosity of the ink, the elasticity and feel of the printed pattern after curing can be regulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the infrared spectrum of sample 3 polyurethane acrylate oligomer.

[0033] Figure 2 The Tencel fabric printing picture of Example 7. DETAILED DESCRIPTION

[0034] In the present invention, unless otherwise specified, the raw materials used are commercially available products known to those skilled in the art. The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0035] The polyurethane acrylate oligomer used in some embodiments of the present invention is prepared by the following method: weighing a difunctional isocyanate and putting it into a reactor, turning on a nitrogen protection device, heating to 80°C and then starting to drip an alcohol hydroxy silicone oil solution, and continuing to keep the temperature for reaction for 2 hours after the dripping is completed to obtain a silicone oil prepolymer; in parallel, a polyether prepolymer is prepared by the same method; a chain extender 1,4-diamino-2-butene solution is dripped into the reactor containing the silicone oil prepolymer, and after the dripping is completed, the temperature is continued to be kept for reaction for 2 hours, and then the polyether prepolymer is optionally added, and the temperature is kept and stirred for 2 hours; finally, a capping agent hydroxyethyl methacrylate (HEA) is added, and the mixture is removed from the pot after being stirred for 4 hours, and the polyurethane acrylate oligomer is obtained after the solvent is evaporated.

[0036] Illustratively, polyurethane acrylate oligomers were prepared according to the above method, and the process parameters and viscosity were shown in Table 1.

[0037] Table 1

[0038]

[0039] a The mass of the difunctional isocyanate is the total amount used to prepare the polyurethane acrylate oligomer sample, and is allocated according to the molar ratio of alcohol hydroxy silicone oil and polyether polyol when preparing silicone oil prepolymer and polyether prepolymer respectively.

[0040] The infrared spectrum of sample 3 is shown in the attached manual. Figure 2 As shown in the figure, 1100cm -1 and 1080cm -1 The characteristic absorption peaks of Si-O and Si-C appeared at 1600-1680cm -1 There are two characteristic absorption peaks of C=C, corresponding to C=C in different chemical environments, 1720cm -1 The characteristic absorption peak of C=O appeared, indicating that the polyurethane acrylate oligomer containing silicone oil segment was successfully synthesized.

[0041] It is worth noting that the types of polyether polyols include polytetrahydrofuran diol, polybutylene glycol, etc., not limited to polypropylene glycol and polyethylene glycol, and the number average molecular weight of polyether polyols includes any value between 200 and 2000 g / mol, not limited to 400 g / mol or 1000 g / mol; those skilled in the art can select the type and molecular weight of polyether polyols according to the target feel, elasticity and hydrophilicity of the printing, and the viscosity of the ink, and it is also feasible to invest more than two polyether polyols with different molecular weights or types. The polyether polyols used in Table 1 above are only exemplary and not intended to limit the scope of protection of the present invention. In addition, the number average molecular weight of the alcohol hydroxy silicone oil is preferably 800 to 1500 g / mol. The alcohol hydroxy silicone oil within this range is not only easy to obtain raw materials, but also the prepared polyurethane acrylate oligomer meets the viscosity requirements. In addition, hydroxyethyl acrylate can also be replaced by hydroxypropyl acrylate or hydroxybutyl acrylate.

[0042] Alcohol hydroxy silicone oil was purchased from Anhui Aiyota Silicone Oil Co., Ltd.

[0043] The vinyl silane coupling agent surface modified pigment used in some embodiments of the present invention is prepared by the following method: preparing an aqueous solution with a pH of 2 to 6 or a pH of 8 to 12, adding a vinyl silane coupling agent and stirring to dissolve, adding a pigment powder and dispersing it evenly by stirring and / or ultrasound, heating to 40 to 80° C. and stirring evenly for 1 hour, then centrifuging to separate the solid, washing the solid with water for multiple times, and drying to obtain a vinyl silane coupling agent surface modified pigment.

[0044] The pigment is selected according to the color of the printed pattern, including but not limited to titanium dioxide, red iron oxide, yellow iron oxide, and blue iron oxide.

[0045] Illustratively, vinyl silane coupling agent surface-modified red iron oxide is prepared according to the above method, the vinyl silane coupling agent is γ-methacryloxypropyltrimethoxysilane, the pH of the aqueous solution is 4, the feeding ratio of the aqueous solution, γ-methacryloxypropyltrimethoxysilane, and red iron oxide is 100mL:0.1g:1g, and the reaction temperature is 60°C.

[0046] Titanium dioxide, iron oxide red, iron oxide yellow and iron oxide blue were purchased from Tianjin Jifa Pigment Co., Ltd.

[0047] Some embodiments are provided below to illustrate the technical solution of the present invention.

[0048] Example 1

[0049] A Tencel digital printing process comprises the following steps:

[0050] Tencel satin fabric (20 tex × 28 tex, 132 strands / 10 cm × 62 strands / 10 cm) was purchased from Hangzhou Runyan Textile Technology Co., Ltd.

[0051] (1) preparing a pretreatment solution: dissolving methacryloyl chloride in dichloromethane to obtain a pretreatment solution having a methacryloyl chloride content of 2 wt %;

[0052] (2) Fabric pretreatment: The pretreatment liquid was applied to the surface of the Tencel fabric by spraying and left to stand for 3 h. The amount of pretreatment liquid applied was 200 mL / m 2 ;

[0053] (3) Drying: Place the Tencel plain weave fabric in a 90°C forced air oven and dry it for 1 h.

[0054] (4) Preparation of pigment printing ink: The polyurethane acrylate oligomer, free radical active diluent and pigment were pre-dispersed by shearing at 5000 rpm for 15 min in a high-speed shearing machine; then transferred to a ball mill for further grinding and dispersion using 0.1 mm agate beads until the solid particle size was less than 800 nm, and finally a photoinitiator was added and ultrasonically dispersed for 10 min under light-proof conditions to prepare a pigment printing ink.

[0055] Among them, the polyurethane acrylate oligomer is sample 3 in Table 1, the free radical active diluent is a mixture of butyl acrylate, hydroxyethyl methacrylate and isobornyl acrylate in a mass ratio of 1:1:2; the photoinitiator is benzoin dimethyl ether; the pigment is purchased red iron oxide; the percentage content of each component is: 30% sample 3, 68% free radical active diluent, 0.5% benzoin dimethyl ether, and 1.5% red iron oxide.

[0056] (5) Digital inkjet printing: Add pigment printing ink to the digital printing equipment, and use digital control to print on the fabric surface as needed to obtain the desired pattern (needle inner diameter 0.15mm (30G), air pressure 80kPa, moving speed 10mm / s).

[0057] (6) Photocuring: The printed fabric was placed in a nitrogen atmosphere and irradiated with ultraviolet light for 10 min using a 250 W, 365 nm main wavelength high pressure mercury lamp.

[0058] Example 2

[0059] A Tencel digital printing process comprises the following steps:

[0060] Tencel satin fabric (20 tex × 28 tex, 132 strands / 10 cm × 62 strands / 10 cm) was purchased from Hangzhou Runyan Textile Technology Co., Ltd.

[0061] (1) preparing a pretreatment solution: dissolving crotonyl chloride in acetonitrile to obtain a pretreatment solution having a crotonyl chloride content of 5 wt %;

[0062] (2) Fabric pretreatment: The pretreatment solution was applied to the surface of the Tencel fabric through multiple coatings and left to stand for 3 h. The amount of pretreatment solution applied was 80 mL / m 2 ;

[0063] (3) Drying: Dry the Tencel plain fabric in a 130°C forced air oven for 3 h.

[0064] (4) Preparation of pigment printing ink: The polyurethane acrylate oligomer, free radical active diluent and pigment were pre-dispersed by shearing at 5000 rpm for 15 min in a high-speed shearing machine; then transferred to a ball mill for further grinding and dispersion using 0.1 mm agate beads until the solid particle size was less than 800 nm, and finally a photoinitiator was added and ultrasonically dispersed for 10 min under light-proof conditions to prepare a pigment printing ink.

[0065] The polyurethane acrylate oligomer is sample 1 in Table 1, and the free radical active diluent is a mixture of ethyl acrylate, dicyclopentenyl acrylate, and hydroxypropyl methacrylate in a mass ratio of 1:1:2;

[0066] The photoinitiator is isopropyl thioxanthone; the pigment is purchased red iron oxide; the percentage content of each component is: 40% sample 1, 58% free radical active diluent, 1% isopropyl thioxanthone, and 1% red iron oxide.

[0067] Steps (5) to (6) are the same as in Example 1.

[0068] Example 3

[0069] A Tencel digital printing process comprises the following steps:

[0070] (1) preparing a pretreatment solution: dissolving 3-methyl crotonyl chloride in ethyl acetate to obtain a pretreatment solution having a 3-methyl crotonyl chloride content of 8 wt %;

[0071] (2) Fabric pretreatment: The pretreatment solution was applied to the surface of the Tencel fabric by two dipping and two rolling, with a liquid rate of 60%, and allowed to stand for 3 hours;

[0072] (3) Drying: Dry the Tencel plain fabric in a 90°C forced air oven for 3 h.

[0073] (4) Preparation of pigment printing ink: The polyurethane acrylate oligomer, free radical active diluent and pigment were pre-dispersed by shearing at 5000 rpm for 15 min in a high-speed shearing machine; then transferred to a ball mill for further grinding and dispersion using 0.1 mm agate beads until the solid particle size was less than 800 nm, and finally a photoinitiator was added and ultrasonically dispersed for 10 min under light-proof conditions to prepare a pigment printing ink.

[0074] The polyurethane acrylate oligomer is sample 2 in Table 1, and the free radical active diluent is a mixture of isooctyl methacrylate and hydroxyethyl methacrylate in a mass ratio of 3:2;

[0075] The photoinitiator is camphorquinone; the pigment is purchased titanium dioxide; the percentage content of each component is: 50% sample 2, 47% free radical active diluent, 1% camphorquinone, and 2% titanium dioxide.

[0076] Step (5) is the same as in Example 1.

[0077] (6) Photocuring: The printed fabric was placed in a nitrogen atmosphere and irradiated with a 50 W, 465 nm main wavelength blue light LED for 10 min for curing.

[0078] Example 4

[0079] The difference from Example 1 is that red iron oxide surface-modified with a vinyl silane coupling agent is used instead of red iron oxide as the pigment.

[0080] Example 5

[0081] The difference from Example 1 is that Sample 1 in Table 1 is used instead of Sample 3 as the polyurethane acrylate oligomer.

[0082] Example 6

[0083] The difference from Example 1 is that Sample 2 in Table 1 is used instead of Sample 3 as the polyurethane acrylate oligomer.

[0084] Example 7

[0085] The difference from Example 1 is that iron oxide blue surface-modified with a vinyl silane coupling agent is used as the pigment instead of iron oxide red.

[0086] The printed pictures of Tencel fabric in this embodiment are as shown in the attached manual. Figure 2As shown in the figure, it can be seen that the printed pattern has a clear outline and a deep apparent color.

[0087] Comparative Example 1

[0088] The difference from Example 1 is that the Tencel fabric is not pretreated, that is, the Tencel fabric is directly subjected to step (5) digital inkjet printing with the ink of step (4).

[0089] Comparative Example 2

[0090] The difference from Example 1 is that no polyurethane acrylate oligomer is added to the pigment printing ink in step (4), that is, the percentage content of each component of the pigment printing ink is: 98% free radical active diluent, 0.5% benzoin dimethyl ether, and 1.5% red iron oxide.

[0091] Comparative Example 3

[0092] The difference from Example 2 is that the pigment printing ink is prepared by using vinyl silicone oil with Mn=1000 g / mol instead of polyurethane acrylate oligomer.

[0093] Vinyl silicone oil was purchased from Anhui Aiyota Silicone Oil Co., Ltd.

[0094] Comparative Example 4

[0095] The difference from Example 3 is that N-methyldiethanolamine is used instead of 1,4-diamino-2-butene as the chain extender to prepare the polyurethane acrylate oligomer. The preparation method is the same as that of Sample 2 in Table 1.

[0096] The mass ratio of polypropylene alcohol (Mn=1000 g / mol), 4,4'-dicyclohexylmethane diisocyanate, N-methyldiethanolamine, and hydroxyethyl methacrylate is 10:5.78:0.6:1.82.

[0097] The pigment printing inks prepared in the examples and comparative examples and the printed Tencel fabrics were tested.

[0098] Test Example 1 Viscosity of Pigment Printing Ink

[0099] It is measured using a rotational viscometer.

[0100] Test Example 2: Paint film mechanical properties test

[0101] The paint printing ink is poured onto a tetrafluoroethylene mold and then cured under the same light curing conditions to obtain a paint film, and the thickness of the obtained paint film is controlled at 0.1-0.2 mm; the tensile strength and elongation at break of the film are tested using a universal material testing machine Instron 3367 in accordance with GB / T1040.3-2006 "Determination of tensile properties of plastic films", and the stretching speed is 10 mm / min.

[0102] Test Example 3: Paint film flexibility test

[0103] The flexibility of the paint film was tested using a paint film flexibility tester in accordance with GB / T 1731-2020 "Determination of flexibility of paint films and putty films".

[0104] Test Example 4: Apparent Color Depth K / S Value Test

[0105] The apparent color depth K / S value was measured using a Datacolor 650 colorimeter with a D65 light source and a 10° viewing angle. The K / S value at the maximum absorption wavelength of the printed pattern was measured. Each sample was measured 4 times at different positions and the average value was taken.

[0106] Test Example 5: Color fastness test

[0107] The color fastness to rubbing is determined in accordance with GB / T 3920-2008 “Textiles—Tests for Color Fastness—Colour Fastness to Rubbing”.

[0108] The color fastness to yellowing from light is determined in accordance with GB / T 30669-2014 “Textiles—Tests for Color Fastness—Color Fastness to Yellowing from Light”, and the irradiation time is 6 hours.

[0109] The test results are shown in Tables 2 and 3.

[0110] Table 2

[0111]

[0112]

[0113] As can be seen from Table 3, the viscosity of the paint printing ink provided by the present invention is low after heating, which meets the application requirements of digital inkjet printing, and the paint film has good tensile strength and elongation at break, so it has good flexibility. When applied to the printed pattern on the surface of the fabric, it has good softness and elasticity, which is conducive to improving durability. From the paint film performance of Examples 1 to 6, it can be seen that the paint film performance can be regulated by regulating the type and proportion of the chain segments in the polyurethane acrylate oligomer in the ink and the proportion of each component in the ink. In addition, from Examples 1 and 3, the ink formula provided by the present invention can be applied to ultraviolet light curing and blue light curing, and the effect of the paint film after curing is not much different, and the corresponding photoinitiator can be selected according to the process requirements. From Examples 1 and 4, it can be seen that surface modification of the pigment is beneficial to improving the tensile strength of the paint film; from Example 1 and Comparative Example 2, without adding polyurethane acrylate oligomer, the tensile strength and elongation at break of the paint film are reduced; from Example 2 and Comparative Example 3, when vinyl silicone oil is used instead of polyurethane acrylate oligomer, the elongation at break of the paint film is significantly reduced. The reason is that the polyurethane acrylate oligomer contains substituted urea groups (R2N-(C=O)-NR2), which as hard segments, form ordered micro-regions by aggregation. These regions provide physical cross-linking points and enhance the mechanical strength of the material; while the silicone oil segment as a soft segment constitutes an amorphous continuous phase, ensuring the flexibility of the material, thereby improving the strength and elongation at break of the paint film at the same time. Compared with Example 3 and Comparative Example 4, N-methyldiethanolamine is used instead of 1,4-diamino-2-butene as a chain extender, which reduces the number of vinyl active groups, so the tensile strength is reduced.

[0114] Table 3

[0115]

[0116]

[0117] From the data in Table 3, it can be seen that the present invention uses coating ink to print Tencel fabric, and the obtained printed pattern has good apparent color depth and color fastness. Specifically, compared with Example 1, Example 4 has higher color fastness, indicating that the participation of surface modified pigments in light curing is beneficial to improving the color fastness of the pigment; compared with Example 4, Example 3 uses 1,4-diamino-2-butene as a chain extender to prepare polyurethane acrylate oligomers, and compared with N-methyldiethanolamine, the obtained printed pattern has greatly improved light yellowing color fastness, because the amino group is easy to yellow under high temperature or ultraviolet conditions. Compared with Example 1, Comparative Example 1 has poor apparent color depth and color fastness because the fabric is not surface treated, indicating that allowing the fabric to participate in curing is beneficial to improving the color fastness of the printing.

[0118] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A Tencel digital printing process, characterized in that: The following steps are involved: (1) dissolving an acryloyl chloride compound in a solvent to obtain a pretreatment solution; (2) applying the pretreatment liquid to the surface of the Tencel fabric; (3) Drying; (4) preparing a pigment printing ink, wherein the pigment printing ink comprises a polyurethane acrylate oligomer, a free radical active diluent, a photoinitiator, and a pigment; (5) digital inkjet printing to obtain digital inkjet printed fabric; (6) Photocuring 2. A Tencel digital printing process according to claim 1, characterized in that: The acryloyl chloride compound includes at least one of methacryloyl chloride, 3-methylcrotonoyl chloride or crotonoyl chloride.

3. A Tencel digital printing process according to claim 1 or 2, characterized in that: The pigment is a vinyl silane coupling agent surface modified pigment; the vinyl silane coupling agent is at least one of vinyl trimethoxy silane, vinyl triethoxy silane and gamma-methacryloxypropyl trimethoxy silane.

4. A Tencel digital printing process according to claim 3, characterized in that: The polyurethane acrylate oligomer includes a polysiloxane segment, and the preparation method is as follows: a double-terminal alcohol hydroxy silicone oil is prepolymerized with a difunctional isocyanate, and then 1,4-diamino-2-butene is added for chain extension reaction, and finally hydroxyethyl methacrylate or hydroxypropyl methacrylate is added for end-capping to obtain the polyurethane acrylate oligomer; And / or, the polyurethane acrylate oligomer includes a polysiloxane segment and a polyether segment, and the preparation method is as follows: a double-terminal hydroxy silicone oil, a polyether polyol and a difunctional isocyanate are prepolymerized to obtain a silicone oil prepolymer and a polyether polyol prepolymer, 1,4-diamino-2-butene is added to the silicone oil prepolymer for chain extension reaction, and then a polyethylene glycol prepolymer is added to continue the reaction, and finally hydroxyethyl methacrylate or hydroxypropyl methacrylate is added for end-capping to obtain the polyurethane acrylate oligomer.

5. A Tencel digital printing process according to claim 3, characterized in that: The difunctional isocyanate is at least one of isophorone diisocyanate, 4,4'-dicyclohexylmethane diisocyanate or hexamethylene diisocyanate; And / or, the viscosity of the polyurethane acrylate oligomer at 25° C. is ≤2.5 Pa·s.

6. A Tencel digital printing process according to claim 3, characterized in that: The method for preparing the vinyl silane coupling agent surface modified pigment is as follows: dispersing the pigment in an aqueous solution of the vinyl silane coupling agent, adding an acid or a base and stirring the mixture for reaction, performing solid-liquid separation, washing, and drying to obtain the vinyl silane coupling agent surface modified pigment.

7. A Tencel digital printing process according to claim 1, characterized in that: The boiling point of the solvent is lower than 120°C; And / or, the mass percentage of the acryloyl chloride compound in the pretreatment liquid is 2% to 8%; And / or, the fabric pretreatment adopts one of the following methods: dipping, padding, spraying or coating; And / or, the drying temperature is 90-150° C. and the drying time is 3-6 hours; And / or, 30% to 50% of polyurethane acrylate oligomer, 47% to 68% of free radical active diluent, 0.5% to 1% of photoinitiator, and 1% to 2% of pigment.

8. The Tencel digital printing process according to claim 1, characterized in that: The free radical active diluent is at least one of ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, isooctyl (meth)acrylate, hydroxyethyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentenyl acrylate or hydroxypropyl (meth)acrylate; And / or, the photoinitiator is at least one of an aromatic ketone initiator, an α-hydroxyalkyl phenone initiator, a thioxanthone derivative and an organic metallocene initiator; preferably, the photoinitiator is one of camphorquinone, benzoin dimethyl ether, α-hydroxycyclohexyl benzophenone and isopropyl thioxanthone.

9. A Tencel digital printing process according to claim 1, characterized in that: The photocuring refers to the radiation curing of the digital inkjet printed fabric using light with a wavelength of 200 to 480 nm.

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