CH714518A1 - Pretreatment solution for inkjet printing on textile goods. - Google Patents

Abstract

The present application is directed to a pretreatment solution for inkjet printing on textile fabrics using a reactive dye. The pretreatment solution comprises from 0.1 to 30% by weight of at least one surfactant, from 0.005 to 15% by weight of at least one thickener, from 30 to 99.9% by weight of water and from 0.0001 to 50 Wt .-% of at least one polyamine. The pH of the pretreatment solution is adjusted to a pH of 5 to 11, preferably to a pH of 8 to 10. The present application is further directed to a process for inkjet printing on textile fabrics using reactive dyes. The method comprises the steps of applying a pretreatment composition to a fabric, printing the fabric with an ink jet printer using an aqueous ink composition comprising at least one reactive dye, and heat treating the printed fabric at a temperature of 40 ° C to 140 ° C. The pretreatment solution comprises from 30 to 99.9% by weight of water, from 0.1 to 10% by weight of at least one surfactant, from 0.005 to 15% by weight of at least one thickener and from 0.0001 to 50 % By weight of at least one polyamine, the pH of the pretreatment solution being adjusted to a pH of from 5 to 11, preferably to a pH of from 8 to 10.

Description

description

Technical Field The invention relates to a pretreatment solution for ink jet printing on textile goods with an aqueous ink composition comprising at least one reaction dye and a method for ink jet printing on textile goods with a pretreatment solution and an aqueous ink composition comprising at least one reaction dye. The pretreatment solution and the process can be used for high-resolution, sharp, multi-color direct inkjet printing on textile surfaces.

Background Art Ink jet technology has been expanded to high speed printing as well as commercial and industrial printing. The digital printing of textile goods began in the late 1980s as a possible replacement for analog screen printing. With the development of a dye sublimation printer in the early 1990s, it became possible to print directly onto textile media using low-energy sublimation and high-energy dispersion inks, in contrast to printing dye-sublimation inks on transfer paper and transferring them to the fabric in a separate one Process using a hot press. Reaction dyes are the youngest and most important class of dyes for cellulose-like materials. The global consumption of reaction dyes for cellulose-like materials was around 10-12% in the mid-1980s, while in Japan alone it accounted for around 40% of the total dye consumption. The reaction dyes offer a wide range of dyes with different shades, saturation (fatness), costs with high brilliance, ease of use and reproducibility. However, a good preparation of the material is a prerequisite.

In contrast to other classes of dyes, up to 50% of the total cost of a process with reaction dyes must be attributed to the washing-up stages in order to remove unfixed or hydrolyzed dye, and the treatment of the wastewater produced. This aspect of the process should be viewed as an essential limitation that prevents reactive dyes from achieving the level of success predicted for them at the time of discovery (Textile Preparation and Dyeing, A.K. Ray Choudhury, Science Publishers). Awareness of the planet's ecology and the energy flows of production and recycling associated with the textile industry is changing consumers' attitudes towards culture and technology, with new demands on environmentally friendly products (Woodhead's range of textiles, textiles and fashion) , Material, design and technology, edited by Rose Sinclair, ISBN 978-1-84569-931-4).

[0004] US 2012/0 225 803 A1 describes polymeric shading dyes and their use in applications or applications on laundry. The polymers are polyethyleneimines that are bound to reaction dyes. WO 2006/055 787 discloses formulations for laundry which contain a cellulose ether polymer which is covalently bound to a reaction dye for lightening cellulose tissue. Such polymers provide poor performance in polyester fabrics. The synthesized polymers cannot be irradiated and cannot be selectively applied to the textile goods. They are used for laundry applications to color entire surfaces. The working solutions are then discharged into the wastewater, which has a considerable relevance for the environment.

Traditional dyeing uses large amounts of urea and inorganic salts to prepare the textile goods before dyeing. After washing, these chemicals are also released into the environment. There is therefore a real need for innovative systems that make it possible to reduce the amount of waste water that is released into the environment.

Summary of the Invention It is the object of the invention to design a pretreatment solution which enables an increased fixation of reaction dyes on textile goods and thus a reduction in the amount of reaction dye which is washed out into the waste water. Furthermore, it is also the object of the present invention to provide a pretreatment solution which enables the use of ink compositions comprising a reactive dye for more types of textile goods, in particular for polyester fabrics.

The solution of the invention is specified by the features of claim 1. According to the invention, the pretreatment solution for inkjet printing on textile goods using a reaction dye comprises from 0.1 to 30% by weight of at least one surfactant, from 0.005 to 15% by weight of at least one thickener, from 30 to 99.9%. -% water and from 0.0001 to 50 wt .-% of at least one polyamine. The pH of the pretreatment solution is adjusted to a pH of 5 to 11, preferably to a pH of 8 to 10.

The present application also relates to a method for inkjet printing on textile goods using reactive dyes. The method is specified by the features of claim 7. The method according to the present invention includes the steps of applying a pretreatment composition to a fabric, printing the fabric with an ink jet printer using an aqueous ink composition comprising at least one reaction dye, and heat treating the printed fabric at a temperature from 40 ° C to 140 ° C. The pretreatment solution comprises from 0.1 to 10% by weight of at least one Sur2 factor, from 0.005 to 15% by weight of at least one thickener, from 30 to 99.9% by weight of water and from 0.0001 to 50 % By weight of at least one polyamine. The pH of the pretreatment solution is adjusted to a pH of 5 to 11, preferably to a pH of 8 to 10.

Surprisingly, it was found that the use of a polyamine in the pretreatment solution increases the rate of fixation of the reaction dye in various types of textiles. Specifically, the fixation rate could be increased for cellulose containing fabrics, but rather unexpectedly also for polyamide and polyester fabrics, where only poor fixation rates are achieved with reactive dye printing processes, as is known in the art. It is believed that the amino function of the at least one polyamine can deprotonate hydroxyl groups in the fabric, particularly cellulose-like fabrics, the deprotonated hydroxyl groups then being available to covalently bond with the reaction dye. Furthermore, it is believed that the amino groups of the at least one polyamine will also be protonated and will form ionic bonds with the reactive groups of the reaction dye, thereby shielding the reactive groups from being hydrolyzed in the aqueous environment. Since hydrolyzed active groups are no longer able to bind to the textile material, any dye molecule with a hydrolyzed reactive group is no longer able to bind to the textile product and is therefore lost.

Furthermore, the polyamine will also react with the reactive groups of the reaction dyes, which leads to the crosslinking of several molecules of the reaction dyes in and around the fibers of the textile material. In addition, the polyamine can also act as a counterion to any sulfone groups that are present in the reaction dyes as solubilizing groups.

There is still a washing process that is needed to remove unfixed or hydrolyzed dye. However, the wastewater is much less colored compared to printing systems known in the art. Aqueous hydrolysis of reactive groups is a problem in that hydrolyzed dyes no longer react with the substrate and are rendered unusable if their functional groups are too reactive. Finally, the stability of the dye-fiber linkage, which determines the washfastness of reaction dyes, depends on their thermal and, in particular, chemical resistance to alkaline or acidic hydrolysis. Therefore, in order for a reaction dye to be useful, the rate of hydrolysis of the dye-fiber bonds must be negligible compared to the rate of fixation. The addition of a polyamine to the fabric with the pretreatment solution is believed to reduce the rate of hydrolysis and increase the rate of fixation of a reaction dye applied to the fabric.

The use of reaction dyes is usually limited to cotton and polyamide printing. However, the use of the pretreatment solution according to the invention before ink jet printing with a reaction dye enables the printing of reaction dyes on more types of textile goods.

In addition, no steam step is required. The fixation is achieved by a thermal heat treatment, in particular at temperatures from 40 to 140 ° C., preferably from 60 to 100 ° C.

In the present application, a reaction dye is to be understood as consisting of a chromophore residue which is linked to a reactive group. Reaction dyes undergo addition or substitution reactions with -OH, -SH and -NH groups, so that covalent bonds are formed. The chromophore residue can be linked directly to the reactive group or via a bridging group. The chromophore residue serves to provide a color and the reactive group covalently binds to a substrate, i.e. to a textile product.

Reaction dyes are described in "Industrial Dyes" (K. Hunger ed., Wiley VCH 2003). Many reaction dyes are listed in the color index of the "Society of Dyers and Colorists" and the "American Association of Textile Chemists and Colorists".

Preferably, the reactive group of the at least one reaction dye is chosen from dichlorotriazinyl, difluorochloropyrimidine, monochlorotriazyl, dichloroquinoxaline, vinyl sulfone, difluorotriazine, monochlorotrizinyl, bromoacrylamide and trichloropyrimidine.

Most preferred is the reactive group of the at least one reaction dye from monochlorotriazinyl; dichlorotriazinyl; and vinyl sulfonyl selected.

The chromophore residue of the at least one reaction dye is preferably selected from an azo compound, an anthraquinone, phthalocyanine, formazan and triphendioaxazine.

Examples of red reaction dyes are reactive red or reactive red 21, reactive red 23, reactive red 29, reactive red 45, reactive red 58, reactive red 65, reactive red 66, reactive red 84, reactive red 116, reactive red 136, reactive red 180, reactive red 194, reactive red 196, reactive red 198, reactive red 218, reactive red 223, reactive red 228, reactive red 238, reactive red 239, reactive red 245, reactive red 264, reactive red 267, Reactive Red 268, Reactive Red 269, Reactive Red 270, Reactive Red 271, Reactive Red 272, Reactive Red 274, Reactive Red 275, Reactive Red 277, Reactive Red 278, Reactive Red 280, Reactive Red 281, Reactive Red 282.

Examples of black reaction dyes are reactive black or reactive black 5, reactive black 31, reactive black 47, reactive black 49.

Examples of blue reaction dyes are reactive blue or reactive blue 59, reactive blue 140, reactive blue 160, reactive blue 238, reactive blue 260, reactive blue 265, reactive blue 267, reactive blue 270, reactive blue 271, reactive blue 275, Reactive Blue 266, Reactive Blue 268, Reactive Blue 269, Reactive Blue 220 and Reactive Blue 235, Reactive Blue 7, Reactive Blue 11, Reactive Blue 14, Reactive Blue 15, Reactive Blue 17, Reactive Blue 18, Reactive Blue 21, Reactive Blue 23, Reactive Blue 25, Reactive Blue 30, Reactive Blue 35, Reactive Blue 38, Reactive Blue 41, Reactive Blue 71, Reactive Blue 72.

Examples of yellow and orange reaction dyes are reactive yellow or reactive yellow 17, reactive yellow 37, reactive yellow 42, reactive yellow 77, reactive yellow 86, reactive yellow 15, reactive yellow 2, reactive yellow 1, reactive yellow 145, Reactive Yellow 81, Reactive Yellow 84, Reactive Yellow 22, Reactive Yellow 145, Reactive Yellow 160, Reactive Yellow 135, Reactive Orange 4, Reactive Orange 7, Reactive Orange 14, Reactive Orange 16, Reactive Orange 78, Reactive Orange 84, Reactive Orange 94, Reactive Orange 107, Reactive Orange 122.

Examples of violet reaction dyes are reactive violet or reactive violet 13, reactive violet 14, reactive violet 19, reactive violet 26.

An example of a green reaction dye is reactive green 19.

Neutralizers and buffers can be used to achieve the desired pH of the pretreatment composition. Sodium hydroxide, sodium acetate, potassium acetate, potassium hydroxide, lithium acetate and lithium hydroxide can be used as neutralizing agents.

The polyamine is preferably present in a concentration of 5 to 50% by weight, preferably 10 to 20% by weight. It was found that the rate of fixation of the reaction dye was particularly increased when this polyamine concentration was used in the pretreatment solution.

The at least one polyamine is preferably a polyethyleneimine. The polyethyleneimine can be linear, branched, dendrimeric, or a mixture thereof.

Examples of polyethyleneimine which can be used in the present invention are Lupasol® FG, Lupasol® G20, Lupasol® PR8515, Lupasol® WF, Lupasol® G35, Lupasol® G100, Lupasol® HF, Lupasol® P, Lupasol ® PS, Lupasol® PN50, Lupasol® PN60, Lupasol® PN70, Lupasol® PN80, as manufactured and sold by BASF. Alkoxylated polyetherimine, such as manufactured and sold by BASF as Sokalan® HP20 or Lupasol® P0100, can also be used. Other examples of polyethyleneimine that can be used in the present invention are Epomin® P-1050, Epomin® SP-012, Epomin® SP-018 as manufactured and sold by Nippon Shokubai.

The polyethyleneimine preferably has an average molecular weight MW of up to 30,000 daltons, more preferably from 2,000 daltons to 20,000 daltons.

The use of polyethyleneimine in this size range makes it possible to apply the pretreatment solution to the textile goods with the aid of an inkjet printing head, this considerably simplifying the use of the pretreatment solution according to the present invention.

The at least one surfactant is preferably at least one nonionic surfactant or at least one cationic surfactant, or it is a mixture thereof.

Any nonionic surfactant known in the art for use in ink jet inks can be used. More preferably the pretreatment composition comprises from 0.5 to 15%, most preferably from 1 to 5% by weight of the at least one nonionic surfactant, the at least one cationic surfactant or a mixture thereof.

If a mixture of at least one non-ionic surfactant and at least one cationic surfactant is used, the ratio of the cationic surfactant to the non-ionic surfactant is preferably equal to or greater than 1. Examples of non-ionic surfactants described herein useful are long chain alkyl poly (ethoxylates) such as Ci ₂ -Ci ₆ (EO) _x H, where EO represents ethylene oxide and x can range from 1 to 8.

[0034] Other examples of nonionic surfactants useful herein include ethoxylated nonionic surfactants. These materials are described, for example, in U.S. Pat. No. 4,285,841 (Barrat et al.).

In one embodiment, the nonionic surfactant is selected from the ethoxylated alcohols and ethoxylated alkylphenols of the formula R (OC ₂ H4) _n OH, where R is selected from the group consisting of aliphatic hydrocarbon radicals having about 8 to about 15 carbon atoms and alkylphenyl radicals in which the alkyl groups contain from about 8 to about 12 carbon atoms and the average value of n is from 5 to 15. These surfactants are more complete in U.S. Pat. No. 4,284,532 (Leikhim et al.).

In one embodiment, the nonionic surfactant is selected from ethoxylated alcohols with an average of about 10 to about 15 carbon atoms and an average degree of ethoxylation of 6 to 12 moles of ethylene oxide per mole of alcohol.

Examples of cationic surfactants are Servamine ™ KAC 458, Servo ™ Q8010, Servo ™ Q8040, Servamine ™ KW100, Servamine ™ KZB 402, Servosoft ™ XW690, available from Elementis Specialties, Codaquat ™ 1207, Edunine® ECWS, Forestill®, which are available from Croda International PLC.

[0038] Preferably the cationic surfactant is a compound selected from the group of esterquat compositions. Esterquat compositions are quaternary ammonium compounds based on ester and amide with a polar and a nonpolar radical. Esterquats correspond to the European detergent regulations and can be used in these applications.

The thickener is preferably at least one non-ionic thickener. The thickener is more preferably at least one nonionic polyurethane dispersion or at least one polyacrylate dispersion.

Preferably, the aqueous ink composition comprises from 0.1 to 40% by weight of at least one reaction dye, from 0.0001 to 30% by weight of at least one surfactant, from 0.001 to 10% by weight of at least one thickener , from 0.05 to 20% by weight of at least one humectant, from 1 to 95% by weight of water, the pH being adjusted to a pH of 4 to 7, preferably from 5 to 6.

[0041] A list of suitable reaction dyes can be found above.

Preferably the surfactant and thickener of the aqueous ink composition are selected from the same surfactants and thickeners used for the pretreatment solution.

The at least one humectant is preferably selected from the group of 2-pyrrolidone, glycol ethers, glycol esters, including diethylene glycol ethers, diethylene glycol monoethyl ethers, butyl ethers, hexyl ethers, propylene glycol ether, dipropylene glycol ether and triethylene glycol ether, acetylene, acetylene Polyethylene, polypropylene oxides and a glycol compound such as ethylene glycol or propylene glycol.

Preferably, the pretreatment solution and the aqueous ink composition are both applied to the fabric using ink jet printing, the pretreatment solution being applied to the fabric by a first ink jet printing step and the aqueous ink composition being applied to the fabric by a subsequent second ink jet printing step.

Preferably, the application of the pretreatment solution and the aqueous ink composition is carried out using two ink jet printheads which are arranged one after the other over an aid for linearly moving a textile product under these ink jet printheads. The aid for moving the textile goods is preferably a conveyor belt or the like. Such an arrangement enables continuous printing on the textile goods.

[0046] The pretreatment solution is preferably applied only to a part of the textile product on which the aqueous ink composition is later printed. This makes it possible to limit the application of the pretreatment solution only to parts of the textile goods on which it will be needed in order to increase the rate of fixation. This allows the amount of the pretreatment solution to be kept to a minimum, thereby reducing the cost and environmental impact of rinsing the pretreatment solution from the fabric into the waste water when the fabric is washed.

The heat treatment is preferably carried out using microwaves or radio frequencies in the range of 10-40 MHz. This enables a short heat treatment time, since the required heat treatment temperature is reached quickly. Furthermore, it is believed that the use of microwaves or radio frequencies in the set range increases the reaction speed, which leads to an increased efficiency of the heat treatment. To use microwaves, a microwave oven or the like can be used. A suitable radio frequency generator is used for heat treatment with radio frequencies.

The present application further relates to the use of a pretreatment solution, as described above, in a method for inkjet printing on a textile product with an aqueous ink composition comprising at least one reaction dye. The method for ink jet printing is preferably a method as described above.

[0049] Further advantageous embodiments and combinations of features result from the detailed description below and the entirety of the claims.

Brief Description of the Drawings The drawings used to explain the embodiments show:

Fig. 1 UV-VIS absorption curves of the waste water of UMSCB13NL soft tissue banner textile with the application of pretreatment solution and without application of pretreatment solution;

Fig. 2 UV-VIS absorption curves of the waste water of cotton ultra-textile goods with the application of pretreatment solution and without application of pretreatment solution;

The same components are given the same reference symbols in the figures.

Examples

Example 1 100 g of pretreatment solution was prepared by mixing the following ingredients:

79,15g water 1.72 g Surfynol® 465 0.40 g Surfynol® 440 5.00 g Dottisol® 10.20 g Lupasol® HF 1.20 g acetic acid 0.13 g Agitan®150 2.20 g Tegoviscoplus® 3010

[0052] Furthermore, 100 g of a black aqueous ink composition was prepared by mixing the following ingredients:

80.00 g a 20% solution of Reactive Black 5 in water 1.60 g Surfynol® 465 0.40 g Surfynol® 440 3.00 g urea 3.50 g 2-pyrrolidone 0.11 g triethanolamine 2.65 g Tegoviscoplus® 3060 8.74 g water

The pretreatment solution and the aqueous ink composition were then printed on various textiles using an Epson® 3000 inkjet piezoprinter. The textile goods were:

- UMSCB13NL soft tissue banner

- Cotton Ultra The pretreatment solution was printed on the textile goods using 12 g / m ² pretreatment solution. The aqueous ink composition was then printed onto the pretreated surfaces of the textile goods using 12 g / m ² aqueous ink composition. As a comparison, an identical print was printed using 12 g / m ² on surfaces of the textile goods to which no pretreatment solution had been applied.

10 cm ^{2 of} the printed textile goods were cut out and soaked in a sample of 50 ml of deionized water for 5 minutes at room temperature. The water soak test is used as a measure to quantify the amount of reaction dye that would be released into the waste water during a washing step. After removal of the textile goods, the UV-VIS spectrum of each water sample was recorded using a 1 cm quartz cuvette and a UV-VIS spectrometer CARY 100 Bio from Varian®.

Table 1 shows the comparison of the absorption spectra of the samples of the textile goods with pretreatment solution and without pretreatment solution:

UMSCB13NL Ultra Cotton

Treated Untreated Treated Untreated

λ max [nm] 597 597.5 600 602 absorption 0.13 0.73 0.64 1.28

Table 1: UV-VIS measurement of water samples from Example 1 /.max represents the wavelength at which the highest absorption value for the sample was measured. A higher absorption value indicates a higher concentration of the reaction dye which was released into the water and was therefore not fixed on the textile goods. As can be seen from the measurements, less of the reaction dye is released into the water if the textile fabric has been pretreated with the pretreatment solution according to the present invention.

The corresponding UV-VIS spectra of the textile goods UMSCB13NL can be found in FIG. 1 and those of the cotton Ultra in FIG. 2. Spectrum A shows the absorption curve of the sample with pretreatment, while spectrum B shows the absorption curve of the sample without pretreatment. As can be seen, the absorption values of the sample without pretreatment (curve B) in the entire spectrum between the wavelengths from 350 nm to 750 nm are significantly higher in comparison with the absorption values of the sample with pretreatment (curve A) for both textile products. This illustrates that the binding efficiency is significantly increased when using a pretreatment solution according to the present invention. Note the maximum absorption at the wavelengths of 597 nm and 597.5 nm for the textile fabric UMSCB13NL in FIG. 1 and at the wavelengths of 600 nm and 602 nm for the textile fabric Cotton Ultra in FIG. 2.

Example 2 100 g pretreatment solution was prepared by mixing the following ingredients:

80.50 g water 1.72 g Surfynol® 465 0.40 g Surfynol® 440 10.11 g Lupasol® HF 4.25 g 2-pyrrolidone 0.19 g triethanolamine 0.13 g Agitan®150 2.70 g Tegoviscoplus® 3010

[0060] Furthermore, 100 g of a magenta aqueous ink composition was prepared by mixing the following ingredients:

58.00 g a 20% solution of Jettex R Red 4b from Dystar® in water 1.72 g Surfynol® 465 U6g Rheolat 150 3.00 g 2-pyrrolidone 0.60 g triethanolamine 82.52 g water

In addition, 100 g of a cyan aqueous ink composition was prepared by mixing the following ingredients:

58.00 g of a 20% solution of Reactive Base Blue 102 liq from Solunaris® in water

1.72 g Surfynol® 465 3.00 g urea 1.28 g Rheolat 150 3.00 g 2-pyrrolidone 0.60 g triethanolamine 33.00 g water

The pretreatment solution and the aqueous ink composition were then printed on a polyester textile using an Epson® 3000 inkjet piezoprinter. The textile goods were:

- Polyester Tertise 130 g / m ² The pretreatment solution was printed on the textile fabric using 12 g / m2 pretreatment solution. The aqueous ink compositions were then printed onto the pretreated surfaces of the fabric using 12 g / m ² aqueous ink composition. As a comparison, an identical print was printed using 12 g / m ² on surfaces of the fabric to which no pretreatment solution had been applied.

10 cm ^{2 of} the printed textile fabric were cut out and soaked in a sample of 50 ml of deionized water for 5 minutes at room temperature. The water soak test is used as a measure to quantify the amount of reaction dye that would be released into the waste water during a washing step. After the textile goods had been removed, the UV-VIS spectrum of each water sample was recorded using a 1 cm quartz cuvette and a UV-VIS spectrometer CARY 100 Bio from Varian®.

Table 2 shows the comparison of the absorption spectra of the samples of the textile goods with pretreatment solution and without pretreatment solution:

Polyester tertise cyan magenta treated untreated treated untreated λ max [nm] 569 548 668 667.5 absorption 0.26 0.94 1.31 2.26

Table 2: UV-VIS measurement of water samples from Example 2 X.max represents the wavelength at which the highest absorption value for the sample was measured. A higher absorption value indicates a higher concentration of the reaction dye which was released into the water and was therefore not fixed on the textile goods. As can be seen from the measurements, less reaction dye is released into the water if the textile fabric has been pretreated with the pretreatment solution according to the present invention. Therefore, this shows that the use of the pretreatment solution according to the present invention makes it possible to increase the binding efficiency of reaction dyes on polyester fabrics.

Claims (16)

claims 1. A pretreatment solution for ink jet printing on textile goods using a reactive dye, the pretreatment solution comprising: a) from 0.1 to 30% by weight of at least one surfactant; b) from 0.005 to 15% by weight of at least one thickener; c) from 30 to 99.9% by weight water; and d) from 0.0001 to 50% by weight of at least one polyamine; wherein the pH of the pretreatment solution is adjusted to a pH of 5 to 11, preferably to a pH of 8 to 10. 2. pretreatment solution according to claim 1, characterized in that the polyamine is present in a concentration of 5 to 50 wt .-%, preferably from 10 to 20 wt .-%. 3. pretreatment solution according to claim 1 or 2, characterized in that the at least one polyamine is a polyethyleneimine. 4. pretreatment solution according to claim 1, characterized in that the polyethyleneimine has an average molecular weight MW of up to 30,000 daltons, preferably from 2000 daltons to 20,000 daltons. 5. pretreatment solution according to any one of claims 1 to 4, characterized in that the at least one surfactant is at least one non-ionic surfactant or at least one cationic surfactant or a mixture thereof. 6. pretreatment solution according to any one of claims 1 to 5, characterized in that the thickener is at least one non-ionic thickener, preferably at least one non-ionic polyurethane dispersion or at least one polyacrylate dispersion. 7. A method for ink jet printing on fabric using reactive dyes comprising the steps of applying a pretreatment composition to a fabric, printing the fabric with an ink jet printer using an aqueous ink composition comprising at least one reactive dye, and heat treating the printed fabric at a temperature of 40 ° C to 140 ° C, characterized in that the pretreatment composition from 30 to 99.9% by weight of water, from 0.1 to 10% by weight of at least one surfactant, from 0.005 to 15% by weight on at least one thickener and from 0.0001 to 50% by weight of at least one polyamine, the pH of the pretreatment solution being adjusted to a pH of 5 to 11, preferably to a pH of 8 to 10 , 8. The method according to claim 7, characterized in that the polyamine is present in a concentration of 5 to 50 wt .-%, preferably from 10 to 20 wt .-%. 9. The method according to any one of claims 7 or 8, characterized in that the at least one polyamine is a polyethyleneimine. 10. The method according to claim 9, characterized in that the polyethyleneimine has an average molecular weight MW of up to 30,000 daltons, preferably from 2,000 daltons to 20,000 daltons. 11. The method according to any one of claims 7 to 10, characterized in that the at least one surfactant is at least one non-ionic surfactant or at least one cationic surfactant or a mixture thereof. 12. The method according to any one of claims 7 to 11, characterized in that the thickener is at least one non-ionic thickener, preferably at least one non-ionic polyurethane dispersion or at least one acrylate polymer dispersion. 13. The method according to any one of claims 7 to 12, characterized in that the aqueous ink composition from 0.1 to 40 wt .-% of at least one reaction dye, from 0.0001 to 30 wt .-% of at least one surfactant, from 0.001 to Comprises 10% by weight of at least one thickener, from 0.05 to 20% by weight of at least one humectant, from 1 to 95% by weight of water, the pH being from 4 to 9, preferably from 5 to 7, is set. 14. The method according to any one of claims 7 to 13, characterized in that the pretreatment solution and the aqueous ink composition are both applied to the textile product by means of ink jet printing, the pretreatment solution being applied to the textile product by a first ink jet printing step and the aqueous ink composition to the textile product are applied by a subsequent second ink jet printing step. 15. The method according to any one of claims 7 to 14, characterized in that the heat treatment is carried out using microwaves or using radio frequencies in the range of 10-40 MHz. 16. Use of a pretreatment solution according to any one of claims 1 to 6 in a method for ink jet printing on a textile product with an aqueous ink composition which comprises at least one reaction dye. Wavelength (nm)