Local deepening printed fabric and preparation method thereof

Abstract

The invention relates to a locally deepened printed fabric and a preparation method thereof, and relates to the field of textile printing. The preparation method comprises the following steps: printing on color cloth by using deepening printing paste containing a deepening agent, an adhesive and a thickening agent, and baking and post-processing to obtain the local deepening printed fabric. According to the invention, the color cloth is printed by using the darkening agent printing paste which does not contain dye or paint, so that the apparent color depth of the fabric is improved, patterns with different depths are presented on the color cloth, and the printed fabric with a characteristic style is obtained; no dye or coating is needed, the production process is short, and the method has the advantages of low production cost, simplicity in operation, low wastewater chromaticity, less wastewater discharge and the like; the device is suitable for various fiber fabrics, and is suitable for various printing machines such as rotary screens, flat screens and the like.

Description

Technical Field

[0001] The present invention relates to a locally deepened printed fabric and a preparation method thereof, and relates to the field of textile printing. Background Art

[0002] Fabric printing is a process of forming patterns on fabrics by using dyes or paints through specific processing methods. The common printing methods include direct printing, resist printing, and discharge printing. Direct printing is to directly print dyes or pigments on white or light-colored fabrics first, and then obtain patterns through post-treatments such as steaming, and it is the most widely used.

[0003] The slurry of the direct printing method contains auxiliaries such as moisturizers, fixing agents, anti-dyeing salts, adhesives, etc., and also contains dyes or paints for coloring. Colored wastewater will reduce the light transmittance of water bodies, resulting in the obstruction of photosynthesis of aquatic plants. Dyes and paints are the main sources of chromaticity in printing wastewater. Usually, they have stable chemical structures such as conjugated double bonds, making them have high chemical stability. It is difficult to destroy their chromophore groups through conventional physical or chemical methods, so as to effectively remove chromaticity. The chemical structures of many dyes and paints are complex, containing aromatic compounds such as benzene rings and naphthalene rings, as well as heterocyclic structures. These structures are difficult to be decomposed and metabolized by microorganisms, resulting in poor biodegradability of the wastewater and difficult biodegradation. Some dyes may also be toxic and will cause harm to aquatic organisms and the ecological environment. In textile production, in order to print multi-color fabrics, usually multiple dyes or paints are required, and sometimes a treatment method is difficult to effectively remove multiple different types of dyes and paints, which increases the production cost and the burden of wastewater treatment. It is necessary to develop a preparation method for multi-color printed fabrics that does not require multiple dyes or paints, reduce the chromaticity of wastewater, and reduce the cost of wastewater treatment. Summary of the Invention

[0004]

Technical Problem

[0005] When formulating colored printing paste, it is necessary to consider the compatibility between dyes or pigments and the accuracy of color matching. It is easy to cause color deviation due to differences in dye batches. Multi-color fabric printing and dyeing wastewater usually contains multiple dyes or paints, and sometimes a treatment method is difficult to effectively remove multiple different types of dyes and paints, resulting in high wastewater treatment costs. It is necessary to develop a preparation method for multi-color printed fabrics that does not require multiple dyes or paints, simplify the color matching process, reduce the chromaticity of wastewater, and reduce the cost of wastewater treatment.

[0006]

Technical Solution

[0007] Aiming at the deficiencies of the prior art, the present invention prints on colored fabrics with a deepening agent slurry without dyes and paints, so that the colored fabrics are locally deepened, presenting a pattern effect of flower shapes, thereby producing multi-color printed fabrics. It has the advantages of wide application range, low production cost, simple operation, and less wastewater discharge.

[0008] The first object of the present invention is to provide a method for preparing a locally deepened printed fabric, comprising the following steps:

[0009] Print the colored fabric with a deepening printing paste containing a deepening agent, a binder and a thickener, and obtain the locally deepened printed fabric through baking and post-treatment.

[0010] In one embodiment of the present invention, the colored fabric is a gray-dyed fabric or a yarn-dyed fabric.

[0011] In one embodiment of the present invention, the water absorption performance of the colored fabric is such that, when tested by Method A of the AATCC TM79-2010e2 (2018)e3 drop method, the water absorption time ≤ 10 seconds.

[0012] If the colored fabric has good water absorption performance, the deepening printing paste can be transferred to the fabric surface more quickly and evenly and be evenly distributed, avoiding the situation of printing paste accumulation or too fast local drying, thereby ensuring the clarity and uniformity of the pattern; it is beneficial to make the deepening printing paste penetrate and absorb into the fabric interior, enabling the deepening agent to fully act with the fabric, enhancing the absorption of light, and achieving a better deepening effect.

[0013] In one embodiment of the present invention, the deepening printing paste is prepared by uniformly mixing a deepening paste, a binder and a thickener; the content of the deepening paste is 90-95 wt%, the content of the binder is 3-5 wt%, and the content of the thickener is 1.5-3.5 wt%.

[0014] In one embodiment of the present invention, the deepening paste is a printing paste containing a deepening silicone oil-based deepening agent.

[0015] In one embodiment of the present invention, the deepening silicone oil-based deepening agent is a weakly cationic type.

[0016] In one embodiment of the present invention, the binder is a cationic or non-ionic binder for pigment printing.

[0017] In one embodiment of the present invention, the main component of the binder is an acrylate polymer.

[0018] In one embodiment of the present invention, the thickener is a non-ionic thickener.

[0019] In one embodiment of the present invention, the thickener is a non-ionic polyurethane thixotropic thickener.

[0020] In one embodiment of the present invention, the viscosity of the thickener / mPa·S (25 °C) < 5000; the active ingredient / %: 40 ± 1%.

[0021] The thickener may form chemical bonds such as hydrogen bonds with the deepening agent molecules, changing the dispersion state and stability of the deepening agent in the printing paste. If the interaction between the thickener and the deepening agent is too strong, it will inhibit the penetration of the deepening agent into the fabric interior and reduce the deepening effect; conversely, if the interaction is too weak, the deepening agent may be unevenly dispersed in the printing paste, affecting the printing quality.

[0022] In one embodiment of the present invention, the colored cloth is printed by a printing machine; the printing machine is selected from a rotary screen printing machine or a flat screen printing machine.

[0023] In one embodiment of the present invention, the baking temperature is 150 - 180 °C and the baking time is 120 - 180 s.

[0024] In one embodiment of the present invention, the post-treatment is water washing → setting → pre-shrinking. Excess deepening printing paste is removed by water washing; the fabric is made flat, soft and dimensionally stable through setting; through the pre-shrinking process, the shrinkage, width and warp and weft density of the fabric are further stabilized, improving the hand feeling of the fabric.

[0025] In one embodiment of the present invention, flat-width water washing is adopted for water washing, with 5 - 8 g / L of soap washing agent and a water washing temperature of 90 - 95 °C.

[0026] In one embodiment of the present invention, the setting speed: 50 - 60 m / min; softening agent: 20 - 30 g / L; pick-up rate: 50% - 60%; pH value: 5.0 - 6.0. The drying room temperature: 130 °C - 150 °C.

[0027] In one embodiment of the present invention, the pre-shrinking process: speed: 70 m / min; cloth shrinking rate: 2.0% - 4.0%; blanket temperature: 120 °C - 130 °C; blanket pressure: 0 - 25 cm; felt steam pressure: 0.1 - 0.3 mbar.

[0028] The second object of the present invention is to provide a locally deepened printed fabric prepared by the above preparation method.

[0029] The third object of the present invention is to provide the application of the above locally deepened printed fabric in the textile field.

[0030] Beneficial effects:

[0031] (1) In the present invention, a deepening agent printing paste without dyes or coatings is used to print on the colored cloth. By utilizing the deepening effect of the silicone oil-based deepening agent, a uniform low refractive index film is formed on the surface of the dyed fabric, correspondingly reducing the refractive index of the dyed fabric to improve the apparent color depth of the fabric, so that a flower pattern with different shades appears on the colored cloth, obtaining a characteristic style printed fabric.

[0032] (2) The deepening printing fabric and its preparation method of the present invention do not require dyes or coatings, do not need to consider the compatibility between dyes or pigments and the accuracy of color matching, reduce the steps and time of preparing printing paste, improve production efficiency, have a short production process, low production cost, and simple operation; dyes may cause color differences due to different batches, but the performance of the deepening agent is relatively stable. Deepening agent printing can make the quality of printed products more stable and reduce the defective rate caused by problems such as color deviation.

[0033] (3) Many dyes will produce a large amount of pollutants such as waste water and waste gas during production and use, causing great pressure on the environment. Using a deepening agent to prepare printing paste reduces the use of dyes, thereby reducing the generation of pollutants and colored waste water during the printing and dyeing process, which is beneficial to environmental protection.

[0034] (4) The deepening printing fabric and its preparation method of the present invention have a wide range of applicability. It is applicable to fabrics made of various fibers such as cotton, wool, silk, linen, polyester, and nylon; it is applicable to various printing machines such as rotary screen printers and flat screen printers. Description of the Drawings

[0035] Figure 1 Photograph of the fabric prepared in Example 1.

[0036] Figure 2 Photograph of the fabric prepared in Example 2.

[0037] Figure 3 Photograph of the fabric prepared in Comparative Example 1.

[0038] Figure 4 Photograph of the fabric prepared in Example 3 after 10 washes.

[0039] Figure 5 Photograph of the fabric prepared in Comparative Example 2 after 10 washes. Detailed Description of the Invention

[0040] In the following examples and comparative examples, the binder used is the non-ionic binder TF-321N from Transfar Chemical, the thickener is the polyurethane thixotropic thickener OS-6060 produced by Guangzhou Guanzhi New Material Technology Co., Ltd., and the deepening paste comes from Guangzhou Sainike High-Tech Materials Co., Ltd.

[0041] Example 1

[0042] Cotton woven grey-dyed and deepening printed fabric, specification: 40 S *40 S *144 threads per inch * 72 threads per inch, plain weave, color is black. Its preparation method includes the steps:

[0043] (1) Preparation of grey-dyed black cloth

[0044] The pure cotton woven fabric is made into grey-dyed black cloth through the following processes:

[0045] Singeing → Alkali oxygen cold stacking → Bleaching (stacking) → Mercerizing → Dyeing → Setting

[0046] Water absorption performance of grey-dyed black cloth: according to AATCCTM79-2010e2(2018)e drip method (Method A), the water absorption time is 6 seconds.

[0047] (2) Deepen printing

[0048] Darkening printing paste is prepared with darkening paste, adhesive and thickener, and the darkening printing paste is used to print and bake on the blank-dyed black cloth through a rotary screen printing machine.

[0049] Darkening printing paste formula: darkening paste 95%, adhesive 3%; thickener 2%.

[0050] The darkening paste used is special effect printing darkening paste FREETEX-YH13 (reddish light).

[0051] The baking temperature is 170°C and the baking time is 150s.

[0052] (3) Post-processing

[0053] The fabric obtained in step (2) is washed, shaped and pre-shrunk to obtain a pure cotton woven grey-dyed darkened printed fabric, such as Figure 1 shown.

[0054] Washing process: long-machine flat-width washing, using 11-section washing box; washing aids: 5#~7# washing box, soap washing. Soaping agent: 5g / L; washing temperature: 1#~4# washing box, washing temperature 50℃; 5#~9# washing box, washing temperature 92℃; 10#~11# washing box, washing temperature 50℃. Vehicle speed: 55m / min; 10#~11# washing box PH value: 4.0-4.5.

[0055] Forming process: speed: 50m / min; softener: 30g / L; rolling rate: 50%-55%; PH value: 5.0-6.0. Drying room temperature: 145℃.

[0056] Pre-shrinking process: machine speed: 70m / min; cloth shrinkage rate: 3.5%; rubber blanket temperature: 120℃-125℃; rubber blanket pressure: 20cm; blanket steam pressure: 0.1mbar.

[0057] Example 2

[0058] Polyester bamboo fiber blended woven grey dyed darkening printed fabric, 50 S Polyester 50% bamboo pulp fiber 50%*50 SPolyester 50% bamboo pulp fiber 50%*154*80, plain weave, green color. The preparation method includes the following steps:

[0059] (1) Preparation of green cloth for dyeing

[0060] The polyester bamboo fiber blended woven fabric is made into green dyed fabric through the following processes:

[0061] Singeing → light alkaline oxygen pile → bleaching (compact type) → long car dispersed active one-bath dyeing → setting

[0062] Water absorption performance of grey-dyed green cloth: according to AATCCTM79-2010e2(2018)e drip method (Method A), the water absorption time is 5 seconds.

[0063] (2) Deepen printing

[0064] Darkening printing paste is prepared with darkening paste, adhesive and thickener, and the darkening printing paste is used for printing and baking on green cloth dyed with green color through a rotary screen printing machine.

[0065] Darkening printing paste formula: darkening paste 93.5%, adhesive 4%; thickener 2.5%.

[0066] The darkening paste used is special effect printing darkening paste FREETEX-YH13 (reddish light).

[0067] The baking temperature is 170°C and the baking time is 120s.

[0068] (3) Post-processing

[0069] The fabric obtained in step (2) is washed, shaped and pre-shrunk to obtain a polyester-bamboo pulp fiber blended woven blank-dyed darkened printed fabric, such as Figure 2 shown.

[0070] Washing process: long-machine flat-width washing, using 11-section washing box; washing aids: 5#~7# washing box, soap washing. Soaping agent: 5g / L; washing temperature: 1#~4# washing box, washing temperature 50℃; 5#~9# washing box, washing temperature 92℃; 10#~11# washing box, washing temperature 50℃. Vehicle speed: 55m / min; 10#~11# washing box PH value: 4.0-4.5.

[0071] Forming process: speed: 50 m / min; softener: 25 g / L; rolling rate: 55%-60%; PH value: 5.0-6.0. Drying room temperature: 135℃.

[0072] Pre-shrinking process: machine speed: 70m / min; cloth shrinkage rate: 3%; rubber blanket temperature: 125℃-130℃; rubber blanket pressure: 20cm; blanket pressure: 0.1mbar.

[0073] Comparative Example 1

[0074] The difference in the preparation method from Example 2 is that step (2) is carried out first and then step (1), and the green dye is replaced with a pink dye.

[0075] The fabric prepared is as Figure 3 shown. When deepening printing is carried out first and then dyeing, the color at the printed pattern becomes lighter, showing a resist dyeing effect. In contrast, the process flow of dyeing first and then deepening printing is shorter and the production operation is simpler.

[0076] Example 3

[0077] The difference in the preparation method from Example 2 is that the green dye is replaced with a blue dye.

[0078] Comparative Example 2

[0079] The difference in the preparation method from Example 3 is that the formulation of the deepening printing paste is changed to: 98% deepening agent and 2% thickening agent.

[0080] The fabrics prepared in Example 3 and Comparative Example 2 were washed 10 times, and the obtained fabrics are as Figure 4 、 5 shown. After the fabric prepared in Comparative Example 2 was washed 10 times, the color of the locally deepened part of the deepening agent printing became significantly lighter. Example 3 has better washing resistance.

[0081] Example 4

[0082] The difference in the preparation method from Example 1 is that the grey-dyed cloth is replaced with a yarn-dyed cloth.

[0083] The color of the locally deepened yarn-dyed cloth prepared is rich. The deepening printing paste reduces the refractive index on the surface of the multi-color yarn-dyed cloth, and the printed pattern shows deepened multi-colors. There is no need for complex color matching and multi-step multi-color printing, and there is no need to consider the compatibility and color matching accuracy between dyes. A fabric with rich colors is prepared by a simple method and raw materials, reducing the production cost and wastewater treatment cost, and having high production efficiency.

[0084] Comparative Example 3

[0085] The difference in the preparation method from Example 1 is that the water absorption performance of the grey-dyed black cloth used is measured by the drop method (Method A) according to AATCCTM79 - 2010e2(2018)e, and the water absorption time is 20 seconds.

[0086] The printed pattern color of the printed fabric prepared is uneven, and the shape edge is not clear.

[0087] Comparative Example 4

[0088] The difference in the preparation method from Example 1 is that an anionic binder and thickening agent are used.

[0089] The cationic deepening paste in the deepening printing paste has an ionic conflict with the anionic binder and thickener, and accumulates to produce precipitation or gel, so printing production cannot be carried out.

[0090] The embodiments provided above are not intended to limit the scope covered by the present invention, nor are the described steps intended to limit the order of their execution. Obvious improvements made by those skilled in the art to the present invention in combination with the existing well-known common sense also fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for preparing a locally deepened printed fabric, characterized in that It includes the following steps: Print the dyed fabric with a darkening printing paste containing a darkening agent, a binder and a thickener, and obtain a locally darkened printed fabric after baking and post-treatment.

2. The preparation method according to claim 1, characterized in that, The dyed fabric is a grey-dyed fabric or a yarn-dyed fabric.

3. The preparation method according to claim 1, characterized in that, The water absorption performance of the dyed fabric is: tested by Method A of the drop method of AATCCTM79 - 2010e2(2018)e3, the water absorption time ≤ 10 s.

4. The preparation method according to claim 1, wherein, The darkening printing paste is prepared by uniformly mixing a darkening paste, a binder and a thickener; the content of the darkening paste is 90 - 95 wt%, the content of the binder is 3 - 9 wt%, and the content of the thickener is 0.5 - 3 wt%.

5. The preparation method according to claim 1, characterized in that, The darkening paste is a printing paste containing a darkening silicone oil-based darkening agent; the binder is a cationic or non-ionic binder for pigment printing; the thickener is a non-ionic thickener.

6. The preparation method according to claim 5, wherein, The darkening silicone oil-based darkening agent is weakly cationic.

7. The preparation method according to claim 1, characterized in that, The baking temperature is 150 - 180 °C, and the baking time is 120 - 180 s.

8. The preparation method according to claim 1, wherein The post-treatment is water washing → setting → pre-shrinking.

9. The locally darkened printed fabric prepared by the preparation method according to any one of claims 1 - 8.

10. The application of the locally darkened printed fabric according to claim 9 in the textile field.

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