TWI874729B - Water-repellent antibacterial ink - Google Patents

Abstract

A water-repellent antibacterial ink used for digital printing on fabrics includes 25 parts by weight to 35 parts by weight of a water repellent and 5 parts by weight to 15 parts by weight of an ammonium salt antibacterial agent, in which an average molecular weight of the ammonium salt antibacterial agent is between 1000 Da and 5000 Da.

Description

Water-repellent antibacterial ink

The present disclosure relates to a water-repellent antibacterial ink, and more particularly to a water-repellent antibacterial ink for digitally printing textiles by inkjet coating.

With the improvement of living standards in today's society, people's demand for functional textiles is getting higher and higher. With the continuous emergence of various functional textiles, the development of functional textiles with specific purposes is also becoming more and more perfect.

In the field of water-repellent textiles, most of the water-repellent textiles on the market currently do not have good antibacterial effects. The reason is that the current method of giving textiles multiple functions is usually to use a single functional ink to spray the textile multiple times, and this method often has problems such as low compatibility of the agent, poor dispersion uniformity of the agent, and mutual interference of functions, and it is impossible to make the textile have multiple functions. In addition, even if a complex and time-consuming process is chosen to achieve the water-repellent and antibacterial requirements of the textile, as the number of times it is worn increases, its water-repellent function will gradually deteriorate and cannot meet the needs of users. Therefore, how to make textiles have both good water repellent and antibacterial properties and maintain their functions for a long time is still an important topic that textile industry is actively researching.

The present disclosure provides a water-repellent antibacterial ink for digital printing inkjet coating of fabrics, which can be firmly arranged on the fabric and stably exert its water-repellent antibacterial effect.

According to some embodiments of the present disclosure, a hydrophobic antibacterial ink for digitally printing inkjet coating of fabrics includes 25 to 35 parts by weight of a hydrophobic agent and 5 to 15 parts by weight of an ammonium salt antibacterial agent, wherein the weight average molecular weight of the ammonium salt antibacterial agent is between 1000 Da and 5000 Da.

In some embodiments of the present disclosure, the ammonium salt antimicrobial agent has a blocked isocyanate group.

In some embodiments of the present disclosure, the hydrophobic antibacterial ink further includes 1 to 3 parts by weight of a surfactant, and the surfactant includes a silicone-based surfactant, an epoxy-based surfactant, or a combination thereof.

In some embodiments of the present disclosure, the epoxyalkyl surfactant includes ethylene oxide-propylene oxide copolymer.

In some embodiments of the present disclosure, the hydrophobic agent is a fluorine-free hydrophobic agent, and the surfactant is an epoxyalkyl surfactant.

In some embodiments of the present disclosure, the hydrophobic agent is a fluorine-containing hydrophobic agent.

In some embodiments of the present disclosure, the hydrophobic antibacterial ink further includes 15 to 25 parts by weight of a humectant and 0.001 to 1 part by weight of a defoaming agent.

In some embodiments of the present disclosure, the surface tension of the hydrophobic antibacterial ink is between 25 mN/m and 32 mN/m.

In some embodiments of the present disclosure, the particle size (D90) of the dispersed matter in the hydrophobic antibacterial ink is between 4.5 nm and 800 nm.

In some embodiments of the present disclosure, the viscosity of the hydrophobic antibacterial ink is between 1.5 cP and 10.0 cP.

According to the above-mentioned embodiments of the present disclosure, since the hydrophobic antibacterial ink of the present disclosure includes an appropriate amount of a hydrophobic agent and an appropriate amount of an ammonium salt antibacterial agent, and the weight average molecular weight of the ammonium salt antibacterial agent falls within an appropriate range, the hydrophobic hydrophobic agent and the hydrophilic ammonium salt antibacterial agent can be avoided from interfering with each other, thereby improving the compatibility between the hydrophobic hydrophobic agent and the ammonium salt antibacterial agent. In this way, when the water-repellent antibacterial ink is disposed on the fabric by digital printing inkjet coating, the water-repellent and the ammonium salt antibacterial agent can co-exist stably in the water-repellent antibacterial coating formed by the water-repellent antibacterial ink, so that the water-repellent antibacterial fabric disposed with the water-repellent antibacterial coating can still have good water-repellency and antibacterial properties after multiple washings.

The following will disclose multiple embodiments of the present disclosure with drawings. For the purpose of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present disclosure. In other words, in some embodiments of the present disclosure, these practical details are not necessary and therefore should not be used to limit the present disclosure.

In this article, the structure of a polymer or group is sometimes expressed as a skeleton formula. This representation may omit carbon atoms, hydrogen atoms, and carbon-hydrogen bonds. Of course, if the atoms or atomic groups are explicitly drawn in the structural formula, the drawn atoms or atomic groups shall prevail.

The present disclosure provides a hydrophobic antibacterial ink for digital printing inkjet coating of fabrics, which includes an appropriate amount of a hydrophobic agent and an appropriate amount of an ammonium salt antibacterial agent. By making the weight average molecular weight of the ammonium salt antibacterial agent fall within an appropriate range, the hydrophobic hydrophobic agent and the hydrophilic ammonium salt antibacterial agent can be prevented from interfering with each other, thereby improving the compatibility between the hydrophobic hydrophobic agent and the ammonium salt antibacterial agent. Thus, when the water-repellent antibacterial ink is disposed on the fabric by digital printing inkjet coating (abbreviated as inkjet coating), the water-repellent and the ammonium salt antibacterial agent can co-exist stably in the water-repellent antibacterial coating layer formed by the water-repellent antibacterial ink, so that the water-repellent antibacterial fabric disposed with the water-repellent antibacterial coating layer can still have good water repellency and antibacterial properties after multiple washings. On the other hand, since the water-repellent antibacterial ink can be directly formed on the fabric by inkjet coating, the cumbersome pre-treatment, high temperature drying treatment and washing treatment steps can be omitted, so that it is widely applicable to a variety of materials and types of fabrics, and the convenience of the process can be improved.

The hydrophobic antibacterial ink disclosed herein comprises 25 to 35 parts by weight of a hydrophobic agent and 5 to 15 parts by weight of an ammonium salt antibacterial agent. The hydrophobic agent and the ammonium salt antibacterial agent falling within the above ratio range can ensure that the hydrophobic antibacterial ink has good hydrophobicity and antibacterial properties. In addition, the weight average molecular weight of the ammonium salt antibacterial agent is between 1000Da and 5000Da, thereby ensuring that when the water-repellent antibacterial ink is disposed on the fabric by inkjet coating, the water-repellent agent and the ammonium salt antibacterial agent can co-exist stably in the water-repellent antibacterial coating formed by the water-repellent antibacterial ink, so that the water-repellent antibacterial fabric disposed with the water-repellent antibacterial coating can still have good water repellency and antibacterial properties after multiple washings. Specifically, if the weight average molecular weight of the ammonium salt antibacterial agent is greater than 5000Da, the directional arrangement of the hydrophobic agent on the fabric will be disturbed by the ammonium salt antibacterial agent, resulting in the hydrophobic agent being unable to be firmly arranged on the fabric, thereby affecting the hydrophobicity that the hydrophobic antibacterial ink can provide; if the weight average molecular weight of the ammonium salt antibacterial agent is less than 1000Da, the ammonium salt antibacterial agent may not be firmly arranged on the fabric.

In some embodiments, the water repellent may be a fluorine-containing water repellent, such as TG-5546 (model, purchased from Taiwan Daikin Advanced Chemical Co., Ltd.) in the UNIDYNE C6 fluorocarbon series containing a fluorocarbon-acrylic copolymer. The fluorine-containing water repellent may have high stability immediately after film formation (i.e., after forming a water-repellent antibacterial coating) to avoid interference from other additives (e.g., surfactants, defoaming agents, etc.) in the water-repellent antibacterial ink, thereby providing stable water repellency. In other embodiments, the water repellent may be a fluorine-free water repellent, such as an acrylic water repellent or a water-based polyurethane (PU) water repellent. Specifically, the acrylic water repellent may be, for example, CT-207 (model, purchased from Chenglong Enterprise Co., Ltd.), the main component of which is ethyl acrylate copolymer. Fluorine-free water repellent may provide environmental friendliness.

In some embodiments, the ammonium salt antimicrobial agent may include an isocyanate trimer. Specifically, the ammonium salt antimicrobial agent may include a structural unit as shown in formula (1), Formula (1), wherein at least one of _R1 and _R2 comprises an isocyanate group. For example, the ammonium salt antimicrobial agent can be derived from an aliphatic isocyanate, such as hexamethylene diisocyanate (HDI), xylylene diisocyanate (XDI), hydrogenated tolylene diisocyanate (HTDI), trimethyl hexamethylene diisocyanate (TMHDI), dicyclohexylmethane-4,4'-diisocyanate (HMDI) or isophorone diisocyanate (IPDI) trimer or a combination thereof. For another example, the ammonium salt antimicrobial agent may be derived from an aromatic isocyanate, such as tolylene diisocyanate (TDI) or diphenyl methane diisocyanate (MDI) trimer or a combination thereof. By including the above isocyanate trimer in the ammonium salt antimicrobial agent, the ammonium salt antimicrobial agent may be reactive, so that after being disposed on a fabric, the ammonium salt antimicrobial agent may be cross-linked to form a film on the surface of the fabric through a high temperature curing process.

In some embodiments, the ammonium salt antimicrobial agent may have a closed isocyanate group, thereby maintaining good stability before the high temperature curing process to avoid self-polymerization before film formation, which results in failure to form a film. Specifically, in the isocyanate trimer (i.e., the structural unit represented by formula (1)) included in the ammonium salt antimicrobial agent, at least one of _R1 and _R2 may include a functional group of 3,5-dimethylpyrazole, that is, including a structural unit as shown in formula (2), Formula (2). In some embodiments, when one of _R1 or _R2 includes the aforementioned isocyanate group, the other may include the aforementioned isocyanate group or a blocked isocyanate group represented by formula (2). In some embodiments, the ammonium salt antibacterial agent may further include an isocyanate pentamer, which differs from the aforementioned isocyanate trimer only in the number of terminal groups (e.g., _R1 and _R2 groups). In detail, the isocyanate pentamer has five ends, and four of the ends may each include an isocyanate group or a blocked isocyanate group. When the ammonium salt antimicrobial agent includes isocyanate pentamer, the film-forming property of the ammonium salt antimicrobial agent can be further improved, thereby ensuring that the ammonium salt antimicrobial agent is firmly disposed on the fabric.

In some embodiments, the hydrophobic antibacterial ink may further include 1 to 3 parts by weight of a surfactant. The surfactant falling within the above ratio range can make the surface tension of the hydrophobic agent close to the surface tension of the ammonium salt antibacterial agent, so as to improve the compatibility of the hydrophobic agent with the ammonium salt antibacterial agent, thereby making the hydrophobic antibacterial ink have good dynamic stability. In some embodiments, the surfactant may include a silicone-based surfactant, an epoxy-based surfactant, or a combination thereof. When the hydrophobic agent is a fluorine-free hydrophobic agent, the surfactant may preferably be an epoxy-based surfactant, thereby ensuring that the fluorine-free hydrophobic agent can exert its hydrophobic effect well. In some embodiments, the epoxyalkyl surfactant may be, for example, ethylene oxide-propylene oxide copolymer.

In some embodiments, the hydrophobic antibacterial ink may further include 15 to 25 parts by weight of a humectant. The humectant falling within the above ratio range can ensure that the hydrophobic antibacterial ink will not condense and settle or block the printhead during the printing process. Specifically, if the content of the humectant is less than 15 parts by weight, the condensation of the hydrophobic antibacterial ink may not be effectively avoided; and if the content of the humectant is greater than 25 parts by weight, it is easy to cause the hydrophobic antibacterial ink to dry too slowly on the fabric, thereby reducing the overall production speed of the digital printing process. In some embodiments, the humectant may be, for example, glycerol, diethylene glycol, propylene glycol methyl ether, or a combination thereof.

In some embodiments, the hydrophobic antibacterial ink may further include 0.001 to 1 parts by weight of a defoaming agent. The defoaming agent falling within the above-mentioned ratio range can ensure that there is no foam in the hydrophobic antibacterial ink. Specifically, if the content of the defoaming agent is less than 0.001 parts by weight, the hydrophobic antibacterial ink is prone to foaming due to the high hydrophilicity of the ammonium salt antibacterial agent therein, thereby affecting the stability of the hydrophobic antibacterial ink and the smoothness during printing; if the content of the defoaming agent is greater than 1 part by weight, it is easy to cause the viscosity and surface tension of the hydrophobic antibacterial ink to be too low, thereby affecting the overall properties of the ink. In some embodiments, the defoaming agent may be, for example, polyether-modified polydimethylsiloxane, cell-breaking polysiloxane, a mixture of cell-breaking polysiloxane dissolved in polyethylene glycol and hydrophobic particles, or a combination thereof.

By uniformly mixing a water repellent, an ammonium salt antibacterial agent and other additives (added as appropriate) to form a water repellent antibacterial ink, and spraying the water repellent antibacterial ink on a fabric by inkjet coating to form a water repellent antibacterial fabric, not only can the fabric be accurately endowed with local or full water repellent antibacterial properties to avoid excessive use of chemical agents, thereby reducing waste and effectively reducing costs, but also can solve the time-consuming and energy-consuming problems caused by multiple processing of traditional textiles and the mutual interference of functional agents (for example, water repellent agents and antibacterial agents), so as to simultaneously endow the fabric with good water repellency and antibacterial properties. On the other hand, applying water-repellent antibacterial ink to fabrics by printing rather than dipping can save cumbersome pre-treatment, high-temperature drying and washing steps, making it widely applicable to a variety of materials and types of fabrics and improving process convenience.

The viscosity, surface tension and particle size of the water-repellent antibacterial ink can be adjusted to fall within a suitable range, so as to facilitate the disposition of the water-repellent antibacterial ink on the fabric through the digital printing inkjet coating process. In some embodiments, the viscosity of the water-repellent antibacterial ink can be between 1.5 cP and 10.0 cP, so that the ink droplets printed can have a suitable size and the water-repellent antibacterial ink can have a suitable fluidity to facilitate the digital printing inkjet coating process. In some embodiments, the surface tension of the water-repellent antibacterial ink can be between 25 mN/m and 32 mN/m, so as to facilitate the formation of ink droplets at the nozzle and make the water-repellent antibacterial ink have good permeability. In some embodiments, the particle size (D90) of the dispersoid in the water-repellent antibacterial ink may be between 4.5 nm and 800 nm, thereby avoiding the problem of nozzle blockage during the digital printing inkjet coating process and making the water-repellent antibacterial ink have good stability. The particle size (D90) of the dispersoid also affects the viscosity of the water-repellent antibacterial ink. For example, a smaller particle size of the dispersoid in the water-repellent antibacterial ink can make the water-repellent antibacterial ink have a lower viscosity. In a preferred embodiment, the viscosity of the hydrophobic antibacterial ink may be between 2.0 cP and 6.0 cP, the surface tension may be between 27 mN/m and 30 mN/m, and the particle size (D90) of the dispersed substance may be between 400 nm and 700 nm, so as to prevent the ink droplets from settling at the nozzle and causing clogging.

In the following description, various evaluations will be conducted on the water-repellent antibacterial ink disclosed herein and the water-repellent antibacterial fabric made with the water-repellent antibacterial ink. It should be understood that the materials used, their amounts and proportions, processing details, and processing procedures, etc. may be appropriately changed without exceeding the scope of the present disclosure. Therefore, the present disclosure should not be construed restrictively by the various embodiments described below. <Experimental Example 1: Evaluation of the dispersibility of water-repellent and ammonium salt antibacterial agent>

In this experimental example, 30 parts by weight of an acrylic fluorine-free water repellent CT-207 (model, purchased from Chenglong Enterprise Co., Ltd.) was mixed with 10 parts by weight of an ammonium salt antibacterial agent with a weight average molecular weight of approximately 3000Da to form the water-repellent antibacterial ink of Example 1; and 30 parts by weight of an acrylic fluorine-free water repellent CT-207 was mixed with 10 parts by weight of a chitin antibacterial agent with a weight average molecular weight of approximately 200000-300000Da to form the water-repellent antibacterial ink of Comparative Example 1. Next, the water-repellent antibacterial inks of Example 1 and Comparative Example 1 were respectively disposed on polyester fabrics through a digital printing inkjet coating process to form water-repellent antibacterial fabrics, and the water repellency of the water-repellent antibacterial fabrics was tested according to the standard method AATCC 22. The test results show that the water repellency of the water-repellent antibacterial fabric formed by the water-repellent antibacterial ink of Comparative Example 1 is only level 1 (ISO 1), while the water repellency of the water-repellent antibacterial fabric formed by the water-repellent antibacterial ink of Example 1 is as high as level 5 (ISO 5). It can be seen that because the weight average molecular weight of chitosan is too large, it will interfere with the directional arrangement of the water repellent on the fabric, resulting in the water repellent being unable to be stably and firmly arranged on the surface of the fabric. <Experimental Example 2: Evaluation of the basic formula of water-repellent antibacterial ink>

In this experimental example, the viscosity, surface tension and spraying condition of the hydrophobic antibacterial ink of the comparative example and the embodiment are measured. The components and contents of the hydrophobic antibacterial ink of each comparative example and each embodiment and the measurement results are shown in Table 1.

Table 1 water Water repellent Antibacterial agents Moisturizer Surfactant Defoaming agent Viscosity(cP) Surface tension (mN/cm) Spraying condition Comparison Example 2 43.00 30 (TG-5546) 7.0 (A) 20 2+1 (D+E) without N/A N/A Sedimentation Comparison Example 3 43.00 7.0 (A) 20 2+1 (D+E) without 4.03 28.86 △ Comparison Example 4 46.67 5.0 (A) 15 2+1 (D+E) without N/A 26.19 X Comparison Example 5 42.50 7.5 (B) 20 2+1 (D+E) without 3.40 24.04 △ Comparative Example 6 43.00 7.0 (C) 20 2+1 (D+E) without N/A N/A Sedimentation Embodiment 2 42.50 7.5 (B) 20 2+1 (D+E) 0.2 3.49 27.38 O Comparison Example 7 43.00 30 (CT-207) 7.0 (A) 20 2+1 (D+E) without 3.28 26.36 △ Embodiment 3 47.50 7.5 (B) 15 1 (E) 0.2 2.44 25.09 O Embodiment 4 47.50 7.5 (B) 15 2 (D) 0.2 2.09 31.64 O Note 1: The unmarked units are parts by weight. Note 2: (A) represents chitosan; (B) represents the ammonium salt antibacterial agent disclosed herein, whose weight average molecular weight is between 1000Da and 5000Da; (C) represents the quaternary ammonium salt antibacterial agent, whose weight average molecular weight is between 150Da and 170Da; (D) represents an epoxy-based surfactant; (E) represents a silicone-based surfactant. Note 3: Comparative Example 4 further adds 3.33 parts by weight of a crosslinker, which is an isocyanate crosslinker. Note 4: The defoamer is a non-silicone defoamer. Note 5: The symbol "X" means that the area cannot be sprayed; the symbol "△" means that the area can be sprayed within 7 days; the symbol "O" means that the area can be sprayed for more than 7 days.

It can be seen from Comparative Examples 2 to 4 and 7 that when chitosan is used as the material of the antibacterial agent, the weight average molecular weight of chitosan is too large, which causes the dispersoid in the ink to precipitate or causes the ink to be unable to be stably sprayed; it can be seen from Comparative Example 2 and Comparative Example 5 that when the surface tension of the ink does not fall within the appropriate range, the ink cannot be stably sprayed, and adding an appropriate amount of defoaming agent can improve the surface tension and sprayability of the ink; it can be seen from Comparative Example 6 that when a quaternary ammonium salt antibacterial agent with a weight average molecular weight that is too small is used as the material of the antibacterial agent, the emulsification balance of the ink will be destroyed to produce precipitation, resulting in the ink being unable to be stably sprayed. In contrast, in Examples 2 to 4, the types and proportions of the components in the hydrophobic antibacterial ink and the ink properties (e.g., viscosity and surface tension) are all within the appropriate range, so the hydrophobic antibacterial ink of each example has appropriate fluidity, is conducive to the formation of ink droplets, and has good permeability. In addition, the hydrophobic antibacterial ink of each example is not prone to ink deposition and nozzle clogging. <Experimental Example 3: Storage Stability Evaluation of Hydrophobic Antibacterial Ink>

In this experimental example, the water-repellent antibacterial ink of Examples 2 and 4 was subjected to high-temperature and room-temperature storage stability tests. Specifically, the high-temperature storage stability test was to place the water-repellent antibacterial ink in an oven at 60°C for 7 days and then test it after it returned to room temperature; while the room-temperature storage stability test was to place the water-repellent antibacterial ink in an environment at room temperature (25°C) for 30 days and then test it. The test content included measuring the solid content, particle size D90, average particle size, viscosity and surface tension of the water-repellent antibacterial ink relative to before the test. The test results are shown in Table 2.

Table 2 Embodiment 2 Embodiment 4 Solid content (%) Original (before test) 29.00 25.00 After high temperature test 29.29 25.00 After normal temperature test 29.14 25.08 Particle size D90 (nm) Original (before test) 417 4.66 After high temperature test 432 4.51 After normal temperature test 472 4.81 Average particle size (nm) Original (before test) 185.9 1.806 After high temperature test 174.1 1.714 After normal temperature test 183.6 1.794 Viscosity(cP) Original (before test) 2.80 2.09 After high temperature test 3.04 2.27 After normal temperature test 3.16 2.41 Surface tension (mN/cm) Original (before test) 27.07 31.64 After high temperature test 27.98 31.99 After normal temperature test 27.73 31.94 Note: The solid content of the water-repellent antibacterial ink is based on the total weight of the water-repellent antibacterial ink.

As shown in Table 2, the solid content, particle size D90, average particle size, viscosity and surface tension of the hydrophobic antibacterial inks of Examples 2 and 4 change very little in either high or normal temperature environments, and remain sprayable. In other words, the hydrophobic antibacterial inks of Examples 2 and 4 can be stored for at least 7 days at high temperatures without deterioration, and can be stored for at least 30 days at normal temperatures without deterioration, showing good storage stability. It should be understood that if the time during which the above-mentioned water-repellent antibacterial ink can be stably stored in a high temperature environment is converted into the time during which the water-repellent antibacterial ink can be stably stored at room temperature, the water-repellent antibacterial ink of each embodiment can be stably stored at room temperature for about 6 months to 2 years. <Experimental Example 4: Evaluation of the water-repellent antibacterial effect of water-repellent antibacterial fabric>

In this experimental example, the water-repellent antibacterial ink of Examples 2 and 4 was sprayed on the surface of a polyester woven fabric (basic weight of 73.0 gsm, warp and weft yarn specifications of 25D/75F, warp density and weft density of ≧400 strands/inch), and a high temperature curing process (heat setting process) was performed to form a water-repellent antibacterial fabric. The water-repellent antibacterial fabric was tested for water repellency according to the standard method AATCC, and the water-repellent antibacterial fabric was tested for sterilization rate according to the standard method AATCC100. Furthermore, each water-repellent antibacterial fabric was tested again after 20 washes according to the standard method AATCC135. The test results are shown in Table 3.

Table 3 Water repellency (level) Sterilization rate (Staphylococcus aureus) (%) Before washing After washing Before washing After washing Embodiment 2 5 5 ＞99.9 ＞99.9 Embodiment 4 5 5 ＞99.9 ＞99.9

As shown in Table 3, all water-repellent antibacterial fabrics have excellent water repellency and sterilization rate before and after washing, indicating that the water-repellent and ammonium salt antibacterial agent can co-exist stably in the water-repellent antibacterial coating formed by the water-repellent antibacterial ink, successfully overcoming the problem of poor washing fastness caused by the use of conventional processing aids.

Through the verification of the above experimental examples, the water-repellent antibacterial ink disclosed in the present invention not only has suitable fluidity and good permeability, but also has a certain degree of stability in both high temperature and normal temperature environments. In addition, the water-repellent antibacterial ink disclosed in the present invention can provide good water-repellent antibacterial properties, and can be accurately sprayed on fabrics by printing inkjet coating to form water-repellent antibacterial fabrics, thereby providing the water-repellent antibacterial fabrics prepared therefrom with good water-repellent antibacterial properties. In addition, the water-repellent antibacterial ink disclosed in the present invention can be firmly arranged on the fabric, which is conducive to improving the water-repellent antibacterial fabric The washing fastness.

Although the present disclosure has been disclosed in the above implementation form, it is not intended to limit the present disclosure. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the definition of the attached patent application scope.

without

without

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

Claims (9)

A water-repellent antibacterial ink is used for digital printing inkjet coating of fabrics. The water-repellent antibacterial ink comprises: 25 to 35 parts by weight of a water-repellent; and 5 to 15 parts by weight of an ammonium salt antibacterial agent, wherein the weight average molecular weight of the ammonium salt antibacterial agent is between 1000 Da and 5000 Da, and the ammonium salt antibacterial agent has a closed isocyanate group. The water-repellent antibacterial ink as described in claim 1 further comprises 1 to 3 parts by weight of a surfactant, wherein the surfactant comprises a silicone-based surfactant, an epoxy-based surfactant or a combination thereof. The water-repellent antibacterial ink as described in claim 2, wherein the epoxy-based surfactant comprises an ethylene oxide-propylene oxide copolymer. The water-repellent antibacterial ink as described in claim 1, wherein the water-repellent is a fluorine-free water-repellent and the surfactant is an epoxyalkyl surfactant. The water-repellent antibacterial ink as described in claim 1, wherein the water-repellent is a fluorine-containing water-repellent. The water-repellent antibacterial ink as described in claim 1 further comprises: 15 to 25 parts by weight of a humectant; and 0.001 to 1 parts by weight of a defoaming agent. The hydrophobic antibacterial ink as described in claim 1, wherein the surface tension of the hydrophobic antibacterial ink is between 25mN/m and 32mN/m. The water-repellent antibacterial ink as described in claim 1, wherein the particle size (D90) of the dispersed substance in the water-repellent antibacterial ink is between 4.5nm and 800nm. The hydrophobic antibacterial ink as described in claim 1, wherein the viscosity of the hydrophobic antibacterial ink is between 1.5 cP and 10.0 cP.