Polyester fabric and method for inkjet printing thereof without reduction cleaning

Abstract

The application provides a polyester fabric and an inkjet printing method without reduction cleaning, relates to the field of textile inkjet printing and also relates to the field of manufacturing textiles. The method is used for directly inkjet printing the polyester fabric by using high-temperature type dispersion dye ink, and the specific method is that a pretreatment agent containing guanidine salt as a main component is used to pretreat the polyester fabric. The guanidine salt can significantly reduce the mobility of the dispersion dye in the dispersion ink, and the ink droplets printed on the fabric cannot be penetrated along the fabric capillary, so that the printed pattern is clear. Meanwhile, after the polyester fabric treated by the pretreatment agent containing guanidine salt as the main component is directly inkjet printed by using the high-temperature type dispersion dye ink and is baked to develop color, the printed polyester fabric does not need reduction cleaning and washing, the fastness meets the national standard, and water saving and emission reduction are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of textile inkjet printing, and also relates to the field of manufacturing textiles, in particular to a polyester fabric and a method for inkjet printing of the polyester fabric without reduction cleaning. BACKGROUND

[0002] At present, the digital inkjet printing of polyester fabric mostly adopts the method of first inkjet printing transfer printing paper, and then transferring the pattern on the transfer printing paper to the polyester fabric by using the sublimation performance of disperse dyes under heat and pressure. The disperse dye ink used in the transfer printing method is low-temperature or medium-temperature ink, and the color sublimation fastness of the obtained pattern is not high. In addition, since a certain pressure is required in the process of thermal transfer printing, the fabric containing a hollow layer is prone to be flattened, thereby losing the three-dimensional effect unique to the fabric itself.

[0003] The digital direct inkjet printing in inkjet printing is to directly inkjet the ink to the polyester fabric, and the ink used is high-temperature disperse dye ink, and the thermal sublimation fastness of the printed product is high. At the same time, the direct inkjet printing only requires high-temperature baking to develop color, and has no pressure effect on the fabric, so the three-dimensional effect of the fabric is still retained; however, the high-temperature disperse dye is not soluble in water, and its dispersion effect is derived from the added dispersant, and the dispersant generally adopts an anionic dispersant. The polyester fiber is hydrophobic, and the ink droplets inkjetted to the fabric will spread along the capillary channel, resulting in the penetration of the inkjet printing pattern.

[0004] The existing conventional method needs to be pretreated before inkjet printing; the substances generally used in the pretreatment include sodium alginate, hydroxymethyl cellulose and the like, which can prevent the ink from spreading and ensure the clarity of the direct inkjet printing; however, these substances must be washed away after dyeing, otherwise they will affect the hand feeling and color fastness of the product, and also produce printing wastewater. SUMMARY

[0005] One of the purposes of the present application is to provide a method for inkjet printing without reduction cleaning; another purpose is to provide a polyester fabric; the inkjet printing method can save the traditional reduction cleaning process, and the obtained polyester fabric not only has clear printing and three-dimensional effect, but also has good hand feeling and color fastness.

[0006] In a first aspect, the present application provides a method for inkjet printing without reduction cleaning:

[0007] 1. A method for inkjet printing without reduction cleaning, comprising the following preparation process:

[0008] 1) The polyester gray fabric is immersed in a pretreatment agent, and the liquid retention rate is 50-90%;

[0009] 2) Drying and setting at 170-190 DEG C;

[0010] 3) Inkjet printing of high-temperature disperse ink containing an anionic dispersant;

[0011] 4) drying;

[0012] 5) baking at 170-190℃ to obtain polyester fabric without reduction cleaning;

[0013] The pretreatment agent comprises 0.5-3 parts of guanidine salt, 0.03-1 part of β-cyclodextrin, 1-3 parts of pH regulator, 0.5-1 part of non-ionic thickening agent and 88-98 parts of water.

[0014] After the polyester fabric is immersed in the pretreatment agent, the positively charged guanidine salt is attached to the polyester fabric. After the high-temperature dispersion ink is jet printed, the guanidine salt combines with the anionic dispersant through electrostatic interaction to neutralize the negative charge and destroy the electrostatic stable layer of the pigment particles. The pigment particles in the high-temperature dispersion ink are aggregated due to the loss of charge repulsion, which reduces the diffusion of the ink and makes it easier to fix on the fiber at high temperature, thereby improving the pattern definition and color fastness.

[0015] The hydrophobic cavity of the cyclodextrin selectively includes the hydrophobic groups (such as carbon chains) in the dispersant, which destroys the steric hindrance effect and makes the dispersant unable to effectively adsorb on the surface of the pigment. Due to the large space of the disperse dye, the inclusion effect of the cyclodextrin on the disperse dye is poor compared with the anionic dispersant. At high temperature, the adsorption between the pigment and the substrate is enhanced, the destroyed pigment is quickly deposited and fixed on the surface of the substrate, forming a pattern with high definition and high color fastness. In this application, the content of guanidine salt, β-cyclodextrin, non-ionic thickening agent and other substances is appropriate and the proportion is small, so there is no need for an additional water washing step to remove residual dispersant. The pretreatment agent formed on the polyester fabric and / or the adhesion has a strong force on the dye, and the β-cyclodextrin has a certain binding effect on the un-fixed dye. Therefore, the dye is fully combined with the fabric, and the traditional reduction cleaning step is omitted.

[0016] Further, the content of the β-cyclodextrin is 0.05-0.5 parts of β-cyclodextrin.

[0017] Further, the high-temperature dispersion ink contains 20-40wt% disperse dye and 0.3-5wt% anionic dispersant.

[0018] Further, the anionic dispersant includes one of sodium lignosulfonate, sodium dodecyl benzene sulfonate SDBS, dispersant CNF, NNO.

[0019] Further, the preferred anionic dispersant is SDBS, sodium lignosulfonate. It may be because the β-cyclodextrin has a good inclusion effect on SDBS and sodium lignosulfonate, and SDBS and sodium lignosulfonate have good dispersion performance, so the definition and color fastness are better. The effect of CNF is poor, which may be because the inclusion ability of β-cyclodextrin on NNO and CNF is weak.

[0020] Further, the anionic dispersant is NNO, and the β-cyclodextrin is β-cyclodextrin with a content of 0.05-0.5 parts.

[0021] Further, the β-cyclodextrin is hydroxypropyl β-cyclodextrin. Further, the guanidine salt includes one or a combination of polyhexamethylene guanidine hydrochloride, polyhexamethylene biguanide hydrochloride, polyhexamethylene guanidine phosphate, polyhexamethylene guanidine sulfate, polyhexamethylene guanidine p-hydroxybenzoate, polyhexamethylene guanidine stearate, polytetramethylene guanidine hydrochloride, and polyoctamethylene guanidine hydrochloride; the pH regulator includes citric acid and / or oxalic acid; and the non-ionic thickening agent includes one or a combination of polyethylene glycol, polyethylene oxide, hydroxyethyl cellulose, polyacrylamide, natural polysaccharide thickening agent, and polyurethane thickening agent.

[0022] Further, the pretreatment agent further includes 0.01-0.1 parts of an antioxidant, and the antioxidant includes Irganox 1010, Irganox 1330, Cyanox 1790, and BASF Irganox 1076.

[0023] Further, the preferred antioxidant is Irganox 1010 and / or Irganox 1330.

[0024] Irganox 1010 has a tetra-substituted hindered phenol structure, a large molecular volume, and significant steric hindrance, and is difficult to enter the β-cyclodextrin cavity and has poor polarity adaptation with the hydrophobic cavity of the β-cyclodextrin; Irganox 1330 has a tri-substituted phenol structure and still has a large steric hindrance, and the inclusion effect is also low, so that the shielding degree of the β-cyclodextrin to the active site of the antioxidant is low, thereby improving the anti-yellowing property of the polyester fabric; the anti-yellowing property of the antioxidants BASF Irganox 1076 and Cyanox 1790 is poor, which may be due to the structure of the mono-substituted phenol structure or the small steric hindrance and the better adaptation of the B-cyclodextrin cavity, the shielding of the inclusion to the active site of the antioxidant is more, resulting in poor antioxidant performance.

[0025] In a second aspect, the application provides a polyester fabric:

[0026] The polyester fabric is obtained by the inkjet printing method of the application without reduction cleaning.

[0027] Beneficial effects: 1. The method of the present application is used for direct jet printing of polyester fabric with high-temperature type disperse dye ink. Specifically, the method is to pretreat the polyester fabric with a pretreatment agent containing guanidine salt as the main component. The guanidine salt can significantly reduce the mobility of disperse dyes in the disperse ink, and the ink droplets jet printed thereon will not seep along the fabric capillary, so that the jet printed pattern is clear. At the same time, after the polyester fabric treated by the pretreatment agent with guanidine salt as the main component is baked and developed color by high-temperature type disperse dye ink direct jet printing, the printed polyester fabric does not need to be reduced and washed, and the fastness meets the national standard, achieving water saving and emission reduction.

[0028] 2. Further, the amount of β-cyclodextrin and the anionic dispersant NNO in the high-temperature disperse ink are optimized, so that the β-cyclodextrin better includes the anionic dispersant, further improving the pattern clarity and color fastness.

[0029] 3. Further, an antioxidant is used in the pretreatment agent, and the type of antioxidant is optimized to reduce the possibility of yellowing of the raw materials in the pretreatment agent under the action of high temperature during preparation, resulting in yellowing of the polyester fabric. Further, the type of antioxidant is optimized to improve the yellowing resistance of the polyester fabric. DETAILED DESCRIPTION

[0030] In order to make the technical scheme of the present application clearer, the present application will be further described in detail below in combination with specific examples.

[0031] Example 1, a reduction-free jet printing method, comprising the following preparation steps:

[0032] 1) The polyester gray fabric (gram weight 85 g / m², full polyester four-way stretch) is treated with a dip-nip pretreatment agent by a mangle, with a liquid retention rate of 50%;

[0033] 2) Then, it is dried and set by a hot air stenter at 180℃;

[0034] 3) Direct jet printing of high-temperature disperse ink containing anionic dispersant, the amount of high-temperature disperse ink is 15 mL / m² (the amount of ink can be selected in the range of 1-20 mL / m² according to actual demand);

[0035] 4) Drying (150℃, 1 min);

[0036] 5) Baking and developing color by a hot air baking machine (180℃, 6 min) to obtain a reduction-free polyester fabric;

[0037] The pretreatment agent, by mass fraction, comprises 0.5-3 parts of guanidine salt, 0.03-1 part of β-cyclodextrin, 1-3 parts of pH adjuster, 0.5-1 part of non-ionic thickening agent, and 88-98 parts of water.

[0038] High temperature dispersion dye includes 10 wt% of dispersion dye (particle size 100 nm, dispersion blue 79), 2 wt% of anionic dispersant (specifically sodium dodecyl benzene sulfonate), 20 wt% of organic solvent (specifically ethylene glycol), 1.5 wt% of non-ionic surfactant (specifically X-100), 0.3 wt% of Dow Corning silicone defoaming agent ACP-0544 (0.05-0.3%), pH regulator citric acid (adjusting pH to 8), 0.1 wt% of antioxidant Irganox 1010, and the balance of water.

[0039] The dispersion dye, the anionic dispersant, and part of the organic solvent / water are mixed, and are treated by zirconium bead grinding or a circulating sand mill to a dye particle size ≤ 150 nm and a PDI ≤ 0.3; the remaining solvent, the surfactant, and the additives are added, and are homogenized by low-speed stirring; and filtration is performed through a 0.45 μm microporous filter membrane to ensure ink cleanliness and nozzle applicability.

[0040] Examples 2 to 5, a reduction cleaning-free inkjet printing method, differ from Example 1 in that the preparation process parameters and the types and weight settings of the raw materials used in the pretreatment agent are different, as shown in Table 1.

[0041] Table 1, list of process parameters used in the inkjet printing method of Examples 1 to 5, and types and weight settings of raw materials used in the pretreatment agent

[0042]

[0043] Among them, the average molecular weight of hydroxyethyl cellulose is 200,000, and the average molecular weight of sodium lignosulfonate is 10,000.

[0044] Example 6, a reduction cleaning-free inkjet printing method, differs from Example 1 in that the dispersant NNO is used instead of an equal amount of sodium dodecyl benzene sulfonate in the high-temperature dispersion ink.

[0045] Example 7, a reduction cleaning-free inkjet printing method, differs from Example 1 in that the dispersant CNF is used instead of an equal amount of sodium dodecyl benzene sulfonate in the high-temperature dispersion ink.

[0046] Example 8, a reduction cleaning-free inkjet printing method, differs from Example 1 in that 1 part by mass of β-cyclodextrin is used in the pretreatment agent.

[0047] Example 9, a reduction cleaning-free inkjet printing method, differs from Example 1 in that 0.5 parts by mass of β-cyclodextrin are used in the pretreatment agent.

[0048] Example 10, a reduction cleaning-free inkjet printing method, differs from Example 1 in that 0.03 parts by mass of β-cyclodextrin are used in the pretreatment agent.

[0049] Example 11, an inkjet printing method without reduction cleaning, differs from Example 1 in that the pretreatment agent also includes 0.1 parts by weight of the antioxidant Irganox 1010.

[0050] Example 12, an inkjet printing method that does not require reduction cleaning, differs from Example 1 in that the pretreatment agent also includes 0.1 parts by weight of the antioxidant BASF Irganox 1076.

[0051] Comparative Example 1, an inkjet printing method that does not require reduction cleaning, differs from Example 1 in that polyhexamethylene guanidine hydrochloride is not used in the pretreatment agent.

[0052] Comparative Example 2, an inkjet printing method that does not require reduction cleaning, differs from Example 1 in that hydroxypropyl β-cyclodextrin is not used in the pretreatment agent.

[0053] Comparative Example 3, an inkjet printing method that does not require reduction cleaning, differs from Example 1 in that the pretreatment agent includes 2 parts by mass of sodium alginate, 1 part by mass of citric acid, and 97 parts by mass of deionized water.

[0054] Comparative Example 4, an inkjet printing method that does not require reduction cleaning, differs from Example 1 in that the pretreatment agent includes 2 parts by weight of sodium alginate, 1 part by weight of citric acid, and 97 parts by weight of deionized water; and a reduction cleaning step is used after baking and color development.

[0055] The reducing cleaning solution contains 2 g / L sodium hydrosulfite and 1 g / L caustic soda.

[0056] Restoration cleaning process: Place the baked and dyed polyester in an overflow dyeing machine, heat it to 70~80℃ at 2℃ / min, keep it warm for 20 minutes, then wash it with 60℃ hot water for 10 minutes, and finally wash it with room temperature water until neutral.

[0057] Performance testing:

[0058] The color fastness to washing with soap was tested according to GB / T 3921-2008, the color fastness to dry cleaning was tested according to GB / T 5711-2015, the color fastness to rubbing was tested according to GB / T 3920-2008, the color fastness to light was tested according to Method 3 of GB / T 8427-2019, the color fastness to perspiration was tested according to GB / T 3922-2013, and the color fastness to water was tested according to GB / T 5713-2013. The test results are shown in Table 2.

[0059] Table 2. List of test data for polyester fabrics obtained using the methods of Examples 1 to 12 and Comparative Examples 1 to 4

[0060]

[0061] The test results of rubbing fastness and sweat resistance of Example 1 are better than those of Example 6 and Example 7. The test results of rubbing fastness and sweat resistance of Example 6 are better than those of Example 7. This may be because the hydrophobic cavity of cyclodextrin selectively includes the hydrophobic groups (such as carbon chains) in the dispersant. The inclusion effect of sodium dodecylbenzenesulfonate > dispersant NNO, dispersant NNO > dispersant CNF. The inclusion effect of cyclodextrin on the dispersant is worse, which affects the interaction force between the disperse dye and the substrate, resulting in poorer adhesion, clarity and color fastness.

[0062] The experimental results of washing performance, rubbing fastness and sweat resistance of Examples 1 and 9 are better than those of Examples 8 and 10, indicating that the optimal amount of β-cyclodextrin further improves the clarity of the pattern and color fastness. It is possible that because the content of β-cyclodextrin is higher, it affects the bonding between the disperse dye and the base fabric, while the content of β-cyclodextrin is lower, resulting in a poorer encapsulation effect on the anionic dispersant.

[0063] Anti-yellowing performance test: Using a colorimeter, under whiteness measurement conditions, randomly measure different parts (8 points) of the sample, calculate the average value, and record it as the initial whiteness. In a UV aging apparatus using a D65 light source, aging for 10 hours each time, repeated 10 times. After aging, use a colorimeter to randomly measure 8 points in the same manner, calculate the average value, and record it as the test whiteness. Calculate the color difference value between the test whiteness and the initial whiteness to evaluate the anti-yellowing performance. The lower the color difference value, the stronger the anti-yellowing ability.

[0064]

[0065] The anti-yellowing performance of Example 11 is better than that of Example 12, possibly because the molecular volume of Irganox 1010 is larger and its steric hindrance is significant, making it difficult to be completely encapsulated by β-cyclodextrin, resulting in a lower degree of shielding of its active sites (such as phenolic hydroxyl groups). In contrast, the Irganox 1076 used in Example 12 has a smaller molecular steric hindrance, better compatibility with the β-cyclodextrin cavity, and a higher encapsulation rate. However, its active sites are excessively shielded, which reduces the effective role of the antioxidant in polyester.

[0066] This indicates that the use of antioxidants in the pretreatment agent results in better anti-yellowing properties of the obtained polyester fabrics during the preparation and use processes.

[0067] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method of inkjet printing without a reduction cleaning, characterized by, The method comprises the following steps: 1) impregnating the polyester fabric with a pretreatment agent at a wet pick-up of 50-90%; 2) drying and setting at 170-190 DEG C; 3) printing a high-temperature dispersion ink containing an anionic dispersant; 4) drying; 5) baking at 170-190 DEG C to develop the color, obtaining a polyester fabric free of reduction cleaning; the pretreatment agent comprises, in parts by mass, 0.5-3 parts of guanidine salt, 0.05-0.5 parts of beta-cyclodextrin, 1-3 parts of pH regulator, 0.5-1 parts of non-ionic thickening agent, and 88-98 parts of water; the high-temperature dispersion ink contains 20-40 wt% of dispersion dye and 0.3-5 wt% of anionic dispersant; the anionic dispersant is sodium lignosulfonate or dispersant NNO.

2. A method of reductant-free cleaning of inkjet printing according to claim 1, characterized in that, The beta-cyclodextrin is hydroxypropyl beta-cyclodextrin.

3. A method of reductant-free inkjet printing according to claim 1, wherein The guanidine salt comprises one or a combination of polyhexamethylene guanidine hydrochloride, polyhexamethylene biguanide hydrochloride, polyhexamethylene guanidine phosphate, polyhexamethylene guanidine sulfate, polyhexamethylene guanidine p-hydroxybenzoate, polyhexamethylene guanidine stearate, polytetramethylene guanidine hydrochloride, and polyoctamethylene guanidine hydrochloride.

4. A process for reductant-free cleaning of inkjet printing according to claim 3, characterized in that, The pH regulator comprises citric acid and / or oxalic acid; the non-ionic thickening agent comprises one or a combination of polyethylene glycol, polyethylene oxide, hydroxyethyl cellulose, polyacrylamide, natural polysaccharide thickening agent, and polyurethane thickening agent.

5. A process for reductant-free cleaning of inkjet printed fabric according to any one of claims 1, 2, 4, characterized in that, The pretreatment agent further comprises 0.01-0.1 parts of antioxidant, which is Irganox 1010 and / or Irganox 1330.

6. A polyester fabric obtained by the method of claim 5.

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