TW202001034A - Fabric pre-treatment agent, digital jet printer, and digital jet printing method using same - Google Patents

Abstract

Provided in the present invention are a fabric pre-treatment agent, a digital jet printer, and a digital jet printing method using same. The technical means of the present invention can enhance the jet printing quality of the fabric so that there are no defects such as uneven colour blocks or pitting and noise, and can greatly decrease the time required for jet printing, to better meet the fabric quality demands of the market and reduce time costs.

Description

Fabric pretreatment agent, digital printing machine, and digital printing method using the same

This creation provides a processing agent, a digital printing machine and a digital printing method using the same, especially a fabric pre-treatment agent, a digital printing machine and a digital printing method using the same.

Traditional fabric dyeing usually uses wet dyeing. In the process, due to multiple processes such as sizing, washing and printing, a large amount of organic and inorganic substances such as dyes, detergents, sulfides or various salts are dissolved in water, so It produces a lot of sewage and destroys the ecological environment; not only that, traditional fabric dyeing has many restrictions such as high labor cost requirements, long time consumption, limited printing colors and patterns, and large equipment footprint. It can no longer cope with the current society's textile products demand.

With the development of technology, digital printing technology has gradually emerged and replaced traditional fabric dyeing. Compared with traditional fabric dyeing, digital printing technology has many advantages such as fast proofing speed, low sewage volume, low labor cost, and rich colors. Makes the fabric products made by digital printing become the mainstream of today's society.

However, the existing printing technology process still has the following shortcomings: the production speed does not meet the market demand, the color is uneven, the occurrence of spots or pits, and the appearance of dew, etc., especially when printing pure color blocks or light color blocks, Obviously, the existing digital printing technology still cannot meet the quality requirements on the market, so further improvement and development are needed.

In view of the shortcomings of the existing digital printing technology, the purpose of this creation is to provide a fabric pretreatment agent. By pre-immersing a fabric in the fabric pretreatment agent for fabric pretreatment, the ink during subsequent digital printing of the fabric can be improved Poor permeability causes problems such as ink accumulation and uneven color blocks.

To achieve the foregoing purpose, the present invention provides a fabric pretreatment agent, wherein based on 1 liter of the fabric pretreatment agent, the fabric pretreatment agent includes: 0.1 g to 10 g of surfactant; 0.1 g to 100 g Penetrating agent; 20 grams to 200 grams of urea; 10 grams to 50 grams of paste; and 10 grams to 60 grams of acid-base regulator.

The fabric pretreatment agent provided in this creation contains a specific content of the aforementioned components. After immersing a fabric in the fabric pretreatment agent for pretreatment, the permeability of the fabric can be improved, so that the pretreated fabric can be digitally processed in the subsequent When printing, because the permeability of the fabric is good, the ink can be evenly distributed on the fabric, and then a color block with a uniform color distribution is obtained.

According to the present creation, the paste includes natural paste and synthetic paste; the natural paste may include sodium alginate, carboxymethyl cellulose, starch hydrolysate, gum arabic, or a combination thereof, but is not limited thereto; The synthetic paste may include etherified starch, etherified cellulose, etherified seed gum, polyvinyl alcohol, polyacrylic acid, or a combination thereof, but is not limited thereto.

Preferably, the surfactant is a nonionic surfactant, an anionic surfactant or a cationic surfactant. More preferably, the surfactant is a nonionic surfactant, wherein the nonionic surfactant is an organosilicon surfactant, a fluorine surfactant, or an acetylene glycol surfactant, but is not limited to this. Even better, the surfactant is an organosilicon surfactant.

Preferably, the penetrating agent is 1,2-Hexanediol (1,2-Hexanediol), 2-Pyrrolidone (2-Pyrrolidinone), ε-caprolactam (ε-Caprolactam) or a combination thereof, but not only Limited to this. More preferably, the penetrant is 1,2-hexanediol.

Preferably, the acid-base regulator is selected from the group consisting of sodium carbonate, sodium bicarbonate, ammonium sulfate, tartaric acid, citric acid, and ammonium tartrate (Ammonium tartrate) and its combination, but not limited to this.

This creation also provides a digital printing machine, which includes: a working table, which includes a conveying table and a nozzle frame, the conveying table is provided with a conveyor belt that can be selectively conveyed in the X direction, and the nozzle frame is It is arranged on the conveying table, and the nozzle frame can selectively slide back and forth along the Y direction, the Y direction intersects the X direction; and a nozzle group, the nozzle group is arranged on the nozzle frame, and the nozzle group has Plural nozzles, which are arranged along the X direction. Preferably, the Y direction is perpendicular to the X direction.

By arranging the plurality of nozzles along the X direction (that is, the same direction as the fabric is transported, also known as a longitudinal arrangement), the nozzle group composed of the plurality of nozzles is moved back and forth along the Y direction intersecting the X direction to spray When printing, compared with the conventional nozzles arranged along the Y direction (that is, perpendicular to the direction of fabric transportation, also known as horizontal arrangement), the machine of the nozzle group has a larger printing area, which further makes the overall printing efficiency Improve and shorten the time required to complete digital printing; not only that, because the nozzles in the digital printing machine of this creation use monochromatic ink composition liquid, it can avoid the miscellaneous generated by the multi-color printing machine when printing pure color blocks Point and pockmarks.

According to this creation, the nozzle can use any commercially available nozzle. For example, the nozzle brand can include Kyocera, Ricoh, Fujifilm, etc., but it is not limited thereto.

Preferably, a plurality of nozzles in the digital printing machine of the present invention can be arranged along the X direction and the Y direction at the same time to form a matrix arrangement of nozzle combinations.

This creation also provides a digital printing method, which includes the following steps: step (a): immersing a fabric in the fabric pretreatment agent of this creation to perform fabric pretreatment to obtain a pretreated fabric; and step (b) : Place the pre-treated fabric on a digital printing machine for digital printing to obtain a printed fabric.

According to this creation, the fabric may be a textile made of natural fibers or synthetic fibers. For example, the material of the fabric may include cotton, cotton, nylon, polyester, etc., but it is not limited to this.

According to this creation, the step of immersing the fabric in the pre-treatment agent for fabric pre-treatment may include any known sizing method, for example, the sizing method may include pressure suction, coating, spraying or printing, etc. Way, but not limited to this. The pre-treated fabric can be wet or dry fabric before digital printing.

Preferably, the digital printing machine in the step (b) uses the digital printing machine created in this step to perform digital printing.

This creation also provides a digital printing method, which includes the following steps: step (a): immersing a fabric in a fabric pre-treatment agent for fabric pre-treatment to obtain a pre-treated fabric; and step (b): The pre-treated fabric is placed on the digital printing machine of the present invention for digital printing to obtain a printed fabric.

Preferably, as step (b) of the aforementioned digital printing method further includes the step of pouring a monochromatic ink composition into the digital printing machine. Preferably, the monochromatic ink composition liquid includes an ink main liquid and an ink diluent.

According to this creation, the ink main liquid may be any ink suitable for digital printing, for example, the ink may include acid ink, reactive ink, dispersing ink or pigment ink, etc., but is not limited thereto.

Preferably, the ink diluent contains a humectant, a surfactant, an acid-base buffer and a preservative; wherein, based on the total weight of the ink diluent, the humectant is between 5 weight percent Up to 70% by weight; the surfactant is between 0.01% and 1% by weight; the acid-base buffer is between 0.1% and 1% by weight; and the preservative is between 0.01% and 1% by weight.

Preferably, the humectant is selected from ethylene glycol (Ethylene glycol), diethylene glycol (Dithylene glycol), triethylene glycol (Trithylene glycol), propylene glycol (Propylene glycol), glycerol (Glycerol), 1 ,6-Hexanediol (1,6-Hexanediol), Ethylene glycol monobutyl ether, Diethylene glycol monobutyl ether, 2-pyrrolidone, N-methylpyrrolidone (N-Methyl pyrrolidone) and its combination, but not limited to this.

Preferably, the surfactant is an alkynediol-based surfactant, an alkoxy surfactant, or a fluorine-containing nonionic surfactant, but it is not limited thereto.

Preferably, the acid-base buffer is sodium hydroxide, triethanolamine, tris(hydroxymethyl)aminomethane, 3-(N-morphine)ethanesulfonic acid ( 3-(N-Morpholino)ethanesulfonic acid), 4-(2-Hydroxyethyl)-1-piperazine-1-ethanesulfonic acid hemisodium salt or The combination, but not limited to this.

Preferably, the preservative is 1,2-benzisothiazol-3-one (1,2-benzisothiazol-3-one), 2,6-dimethyl-1,3-dioxane-4- Alcohol acetate (2,6-dimethyl-1,3-dioxan-4-yl acetate) or a combination thereof, but not limited thereto.

In the description book, the range indicated by "small value to large value", unless otherwise specified, means that the range is greater than or equal to the small value to less than or equal to the large value. For example: 0.1g to 10g means that the range is "greater than or equal to 0.1g to less than or equal to 10g".

The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand the advantages and effects achieved by the present invention through the content of this specification, and make various modifications and changes without departing from the spirit of the present invention. To implement or apply the content of the present invention.

Fabric pretreatment agent

Examples 1A to 1C

Examples 1A to 1C are fabric pretreatment agents with different compositions and contents. The ingredients and contents are listed in Table 1 below. Table 1: Composition and content of fabric pretreatment agents of Examples 1A to 1C

Comparative example 1A to 1C

Comparative Examples 1A to 1C are prior art fabric pretreatment agents, and their composition and content are listed in Table 2 below. Table 2: Composition and content of fabric pretreatment agents of Comparative Examples 1A to 1C

Digital printing machine

As shown in FIGS. 1 and 2, the digital printing machine 1 of the first embodiment includes a working table 10 and a head group 20. The aforementioned working table 10 includes a conveying table 11 and a spray head frame 12, the conveying table 11 is provided with a conveyor belt 111 which can be selectively conveyed in the X direction, the spray head frame 12 is provided on the conveying table 11, and the The nozzle holder 12 can selectively slide back and forth in the Y direction. The aforementioned nozzle group 20 is disposed on the nozzle frame 12 of the workbench 10, and the nozzle group 20 has a plurality of nozzles 21, the nozzles 21 are arranged along the X direction, and each nozzle 21 is provided with a plurality of nozzles 211. In this embodiment, the Y direction is perpendicular to the X direction.

During the printing process, a fabric F can be placed on the conveyor belt 111 so that the fabric F is transported along the X direction on the conveyor belt 111, and at the same time, the nozzle group 20 moves back and forth along the Y direction, thereby passing through the nozzle group 20 The plurality of nozzles 211 sprays the monochromatic ink composition liquid on the fabric F.

In addition, the head group of the digital printing machine of the second embodiment may include a plurality of heads arranged in the Y direction in addition to the plurality of heads arranged in the X direction.

As shown in FIG. 3, the digital printing machine 1 of the second embodiment includes a working table 10 and a head group 20 as described above. The working table 10 includes a conveying table 11 and a head frame 12. The conveying table 11 is provided with a conveying belt 111 that can be selectively conveyed in the X direction. The head frame 12 is disposed on the conveying table 11, and the head frame 12 can selectively slide back and forth in the Y direction. The aforementioned nozzle group 20 is disposed on the nozzle frame 12 of the worktable 10, and the nozzle group 20 has a plurality of nozzles 21, 21A, wherein a plurality of nozzles 21 are arranged along the X direction, and each nozzle 21 is provided with a plurality of nozzles 211, Another group of plural nozzles 21A are also arranged along the X direction, and each nozzle 21A is also equipped with a plurality of nozzles 211A, one group of plural nozzles 21 (4 nozzles 21) and another group of plural nozzles 21A (4 nozzles 21A ) Is arranged along the Y direction. As shown in FIG. 3, a group of plural nozzles 21 and another group of plural nozzles 21A together form a 2×4 matrix arrangement of nozzles.

In this embodiment, the Y direction is perpendicular to the X direction. Similarly, in the printing process, a fabric F can be placed on the conveyor belt 111, so that the fabric F is conveyed along the X direction on the conveyor belt 111, and at the same time, the plurality of nozzles 21, 21A in the nozzle group 20 can be simultaneously along By moving back and forth in the Y direction, a plurality of nozzles 211 and 211A of the head group 20 simultaneously sprays and prints the monochromatic ink composition on the fabric F.

The following describes the implementation of the digital printing method of the present invention, and the part about placing the fabric on the digital printing machine for digital printing is the same as the embodiment of the digital printing machine described above.

Digital printing method

Examples 1 : Digital spraying method of Indonesian dragon fabric

First, a fabric composed of nylon 6 (Nylon 6) is immersed in the fabric pretreatment agent of Example 1A to make the fabric pressure-up rate (pick-up) reach about 60% to 80%. Dry at 80℃ to 100℃ to obtain the fabric after pretreatment.

In addition, a single-color ink composition liquid suitable for nylon fabrics is prepared, and the composition components are listed in Table 3 below. Here, the black acid ink is purchased from Double Bond Chemical Co., Ltd., and its commercial model is Acid Black KA1, and the blue acid ink is purchased from Double Bond Chemical Co., Ltd., and its commercial model is Acid Blue KA1. Table 3: Composition of the monochromatic ink composition liquid of Example 1

Then, the aforementioned pre-treated fabric is placed on the digital printing machine table of the first embodiment, and the aforementioned monochromatic ink composition liquid is poured into 8 Kyocera KJ4B series print heads of the digital printing machine table to start digital printing Printing, where the printing conditions are single-row head, 2PASS, two-way printing of pure color blocks with a size of 1.6 square meters, and finally the printed fabric is colored at 102°C for 30 minutes at the steaming place, and then washed and dried. The fabric of Example 1 was obtained by drying.

Examples 2 ：Method of digitally printing cotton fabric

First, a fabric composed of cotton is immersed in the fabric pretreatment agent of Example 1B, so that the pressure absorption rate of the fabric reaches about 60% to 80%, and the fabric is dried at 80 ℃ to 100 ℃ to obtain The fabric after pretreatment.

In addition, a single-color ink composition liquid suitable for cotton fabrics is prepared. Its composition is listed in Table 4 below. Here, the blue reactive ink is purchased from Double Bond Chemical Co., Ltd., and its commercial model is Reactive Blue K01, and the yellow reactive ink is purchased from Double Bond Chemical Co., Ltd., and its commercial model is Reactive Yellow K01. Table 4: Composition of the monochromatic ink composition liquid of Example 2

Then, the aforementioned pre-treated fabric is placed on the digital printing machine table, and the aforementioned monochromatic ink composition is poured into the 8 Kyocera KJ4B series nozzles of the digital printing machine table to start digital printing. The printing conditions are single-row head, 2PASS, two-way printing of pure color blocks with a size of 1.6 square meters, and finally the printed fabric is colored after being steamed at 102°C for 10 to 15 minutes, and then washed and dried. The fabric of Example 2.

Examples 3 : Digital printing method of polyester fiber fabric

First, a fabric composed of polyester fibers is immersed in the fabric pretreatment agent of Example 1C, so that the pressure absorption rate of the fabric reaches about 60% to 80%, and the fabric is dried at 80 ℃ to 100 ℃ To obtain the fabric after pretreatment.

In addition, prepare a single-color ink composition liquid suitable for polyester fiber fabrics, the composition of which is listed in Table 5 below. Here, the blue dispersible ink is purchased from Double Bond Chemical Co., Ltd., and its commercial model is Disperse Blue KD1, and the yellow dispersible ink is purchased from Double Bond Chemical Co., Ltd., and its commercial model is Disperse Yellow KD1. Table 5: Composition of the monochromatic ink composition liquid of Example 3

Then, the aforementioned pre-treated fabric is placed on the digital printing machine table, and the aforementioned monochromatic ink composition is poured into the 8 Kyocera KJ4B series nozzles of the digital printing machine table to start digital printing. The printing conditions are single-row head, 2PASS, two-way printing of pure color blocks with a size of 1.6 square meters. Finally, the printed fabric is colored at 170 ℃ and steamed for 6 to 8 minutes, then washed and dried. The fabric of Example 3.

Comparative example 1

A fabric composed of nylon 6 was immersed in the fabric pretreatment agent of Comparative Example 1A to make the pressure absorption rate of the fabric reach about 70% to 80%, and the fabric was dried at 80°C to 100°C to obtain The fabric after pretreatment.

Then, the above-mentioned pre-treated fabric is placed on the prior art 8-color digital printing machine table, and it is arranged in a horizontal manner (that is, parallel to the Y direction of the back and forth of the aforementioned nozzle holder) with 8 Kyocera KJ4B series nozzles, and then Filled with 8-color acid inks of emerald blue, magenta, yellow, black, scarlet, orange, blue and light black (Acid KA1 series of single-color inks sold by Double Bond Chemical Co., Ltd., among which blue and black inks The source is the same as in Example 1), then digital printing begins, in which the printing conditions are single-row head, 2PASS, two-way printing of pure color blocks or mixed color blocks with a size of 1.6 square meters, and finally print After the fabric was colored by steaming at 102°C for 30 minutes, and then washed and dried, the fabric of Comparative Example 1 was obtained.

Comparative example 2

After immersing a fabric composed of cotton in the fabric pretreatment agent of Comparative Example 1B to achieve a pressure absorption rate of about 75% to 85%, the fabric was dried at 80°C to 100°C to obtain a The fabric after pretreatment.

Then, the above-mentioned pre-treated fabric is placed on the prior art 8-color digital printing machine table, and it is arranged in a horizontal manner (that is, parallel to the Y direction of the back and forth of the aforementioned nozzle holder) with 8 Kyocera KJ4B series nozzles, and then Filled with turquoise blue, magenta, yellow, black, scarlet, orange, blue and light black 8-color reactive inks (reactive K01 series monochromatic inks sold by Double Bond Chemical Co., Ltd., among which blue and yellow inks) The source is the same as in Example 2), then digital printing starts, in which the printing conditions are single-row head, 2PASS, two-way printing of pure color blocks or mixed color blocks with a size of 1.6 square meters, and finally print After the fabric was colored at 102°C for 10 to 15 minutes, it was washed and dried to obtain the fabric of Comparative Example 2.

Comparative example 3

After immersing a fabric composed of polyester fibers into the fabric pretreatment agent of Comparative Example 1C to achieve a pressure absorption rate of about 50% to 80%, the fabric was dried at 80°C to 100°C. Obtain the fabric after pretreatment.

Then, the above-mentioned pre-treated fabric is placed on the prior art 8-color digital printing machine table, and it is arranged in a horizontal manner (that is, parallel to the Y direction of the back and forth of the aforementioned nozzle holder) with 8 Kyocera KJ4B series nozzles, and then Filled with emerald blue, magenta, yellow, black, scarlet, orange, blue and light black 8-color dispersible inks (disperse KD1 series of single-color inks sold by Double Bond Chemical Co., Ltd., among which blue and yellow After the ink source is the same as in Example 3), digital printing begins. The printing conditions are single-row head, 2PASS, and two-way printing of solid color blocks or mixed color blocks with a size of 1.6 square meters. After the fabric was colored at 170°C for 6 to 8 minutes, it was washed and dried to obtain the fabric of Comparative Example 3.

Fabric quality determination

Observe the printed fabric obtained by the digital printing methods of Examples 1 to 3 and Comparative Examples 1 to 3 through the naked eye, and check whether the printed area on the fabric has pits, noise, uneven color, etc. Defects; In addition, the digital printing rate is also measured and listed in Table 6 below. Table 6: Quality measurement of the fabrics of Examples 1 to 3 and Comparative Examples 1 to 3

According to the measurement results of the fabric quality in Table 6 above, the fabrics of Examples 1 to 3 are pre-treated with a fabric pre-treatment agent of specific composition and content, which can improve the ink quality of the fabric during subsequent digital printing. Permeability, reduce the occurrence of ink accumulation and color unevenness; In addition, the arrangement of the nozzles of the digital printing machine of Examples 1 to 3 is different from the horizontal arrangement of the prior art, and the longitudinal arrangement of the nozzles can increase about 8 times Print rate.

In summary, by pre-treating a fabric with the fabric pre-treatment agent of this creation, and then digitally printing with the digital printing machine of this creation, whether it is printing on nylon fabric, cotton fabric or poly Ester fiber fabrics can improve the printing quality of the fabrics, which can effectively avoid the defects of uneven color of the color blocks or pits and noises on the fabrics; in addition, the use of the technical method of this creative disclosure can also greatly shorten the digital spray The time required for printing makes it more in line with the quality requirements of the fabric on the market and reduces the time cost and enhances the commercial value.

1‧‧‧Digital printing machine 10‧‧‧Workbench 11‧‧‧Conveyor 111‧‧‧Conveyor belt 12‧‧‧ nozzle holder 20‧‧‧ nozzle group 21、21A‧‧‧Sprinkler 211, 211A‧‧‧ nozzle F‧‧‧ fabric

Figure 1 is a three-dimensional schematic diagram of the digital printing machine created in this book; 2 is a schematic plan view of the digital printing process using the digital printing machine of the first embodiment; FIG. 3 is a schematic top view of a digital printing process using the digital printing machine of the second embodiment.

no

1‧‧‧Digital printing machine

10‧‧‧Workbench

11‧‧‧Conveyor

111‧‧‧Conveyor belt

12‧‧‧ nozzle holder

20‧‧‧ nozzle group

21‧‧‧Sprinkler

Claims (13)

A fabric pretreatment agent, wherein based on 1 liter of the fabric pretreatment agent, the fabric pretreatment agent comprises: Surfactant from 0.1g to 10g; 0.1 g to 100 g penetrant; 20 grams to 200 grams of urea; 10 to 50 grams of paste; and 10 to 60 grams of acid-base regulator. The fabric pretreatment agent according to claim 1, wherein the surfactant is a nonionic surfactant, an anionic surfactant or a cationic surfactant. The fabric pretreatment agent according to claim 2, wherein the nonionic surfactant is a silicone-based surfactant, a fluorine-based surfactant, or an acetylene glycol-based surfactant. The fabric pretreatment agent according to claim 1, wherein the penetrant is 1,2-hexanediol, 2-pyrrolidone, ε-caprolactam, or a combination thereof. The fabric pretreatment agent according to claim 1, wherein the acid-base adjusting agent is selected from the group consisting of sodium carbonate, sodium bicarbonate, ammonium sulfate, tartaric acid, citric acid, ammonium tartrate, and combinations thereof. A digital printing machine including: A working table, which includes a conveying table and a spray head frame, the conveying table is provided with a conveyor belt that can be selectively transported in the X direction, the spray head frame is provided on the conveying table, and the spray head frame is optional The ground slides back and forth in the Y direction, which intersects the X direction; and A spray head group is arranged on the spray head frame, and the spray head group has a plurality of spray heads, and the spray heads are arranged along the X direction. The digital printing machine according to claim 6, wherein the printing heads are arranged along the X direction and the Y direction. A digital printing method, which includes the following steps: Step (a): immersing a fabric in the fabric pre-treatment agent as described in any one of claims 1 to 5 to obtain a pre-treated fabric; and Step (b): Place the pre-treated fabric on a digital printing machine for digital printing, to obtain a printed fabric. The digital printing method according to claim 8, wherein the digital printing machine in step (b) uses the digital printing machine described in claim 6. A digital printing method, which includes the following steps: Step (a): immersing a fabric in a fabric pretreatment agent for fabric pretreatment to obtain a pretreated fabric; and Step (b): Place the pre-treated fabric on the digital printing machine table as described in claim 6 to perform printing, to obtain a printed fabric. The digital printing method according to claim 10, wherein step (b) further comprises the step of pouring a single-color ink composition into the digital printing machine. The digital printing method according to claim 11, wherein the monochromatic ink composition liquid includes an ink main liquid and an ink diluent, the ink diluent includes a humectant, a surfactant, and an acid-base buffer And a preservative; wherein, based on the total weight of the ink diluent, the humectant is 5 to 70 weight percent, the surfactant is 0.01 to 1 weight percent, and the acid-base buffer is 0.1 Weight percent to 1 weight percent, the preservative is 0.01 weight percent to 1 weight percent. The digital printing method according to claim 12, wherein the humectant is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, glycerin, 1,6-hexanediol, and ethylene glycol Alcohol monobutyl ether, diethylene glycol monobutyl ether, 2-pyrrolidone, N-methylpyrrolidone, and combinations thereof; the surfactant is an alkynediol-based surfactant, an alkoxy surfactant Or fluorine-containing nonionic surfactant: the acid-base buffer is sodium hydroxide, triethanolamine, trishydroxymethylaminomethane, 3-(N-morpholino)ethanesulfonic acid, 4-(2-hydroxyethyl Base)-1-piperazine ethanesulfonic acid semi-sodium salt or a combination thereof; the preservative is 1,2-benzisothiazol-3-one, 2,6-dimethyl-1,3-dioxane -4-ol acetate or a combination thereof.

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