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CN-122013563-A - No-wash slurry formula and processing technology thereof

CN122013563ACN 122013563 ACN122013563 ACN 122013563ACN-122013563-A

Abstract

The invention relates to the technical field of textile printing, and particularly discloses a washing-free slurry formula and a processing technology thereof, wherein the washing-free slurry formula comprises 20% of Pu2835 aqueous polyurethane emulsion, 3-5% of nano color paste, 75% of water and a proper amount of thickener, wherein after the Pu2835 aqueous polyurethane emulsion is formed into a film, the dry friction fastness is more than or equal to 4 levels, the wet friction fastness is more than or equal to 4 levels, the film forming hardness is less than or equal to 50Shore A, the nano color paste consists of 40% of toner, 2% of polycarboxylate dispersant, 1% of thickener, 54% of water and 3% of anti-settling agent according to mass percent, no obvious settlement exists in the nano color paste after being stored for 12 months, the thickener enables the viscosity of the slurry to be controlled within 5000-800Pa, the problems of unbalanced color paste fastness and hand feeling, excessive VOC (volatile organic compound) and improper viscosity of the conventional washing-free slurry are solved, the dry/wet friction fastness is more than or equal to 4 levels, the hand feeling is soft, the VOC (volatile organic compound) content is low, the nano color paste is stored for 12 months and the viscosity is suitable for the rotary screen printing process, and the subsequent efficient processing basis is laid for the environment protection of a full-aqueous system to meet the standard national requirements.

Inventors

  • JIN WENYAN
  • Li Hongshuan

Assignees

  • 绍兴智仁纺织品有限公司

Dates

Publication Date
20260512
Application Date
20260112

Claims (10)

  1. 1. A no-wash slurry formulation, comprising the following components in mass percent: 20% of Pu2835 aqueous polyurethane emulsion, 3-5% of nano color paste, 75% of water and a proper amount of thickener; the dry rubbing fastness is more than or equal to 4 levels, the wet rubbing fastness is more than or equal to 4 levels, and the film forming hardness is less than or equal to 50Shore A after the Pu2835 aqueous polyurethane emulsion is formed into a film; The nanometer color paste consists of 40% of toner, 2% of polycarboxylate dispersant, 1% of thickener, 54% of water and 3% of anti-settling agent according to mass percentage, and no obvious sediment exists when the nanometer color paste is stored for 12 months; The thickener controls the viscosity of the slurry to 5000-8000Pa and seed.
  2. 2. The no-wash slurry formulation of claim 1, wherein the process for preparing the nano-color paste comprises the steps of: s1, mixing toner, polycarboxylate dispersant, thickener, water and anti-settling agent according to the mass percent defined in claim 1, and stirring until the dispersion uniformity is more than or equal to 95%; s2, introducing the mixed material into a sand mill for high-energy grinding, wherein the sand mill adopts a zirconium bead medium with the diameter of 0.1-0.3 mm, the grinding speed is 1500-2500 r/min, the grinding time is 2-4 hours, and the particle size D50 of the ground material is 30-80 nm; S3, filtering the milled material by a nano filter with the precision of 10-100 nm, wherein the monodispersity variation coefficient of the color paste particles after filtering is less than or equal to 15%; and S4, packaging the filtered material to obtain a nano color paste finished product.
  3. 3. A process for processing a no-wash slurry, comprising the steps of: a1, printing the washing-free slurry on the surface of the fabric by using rotary screen printing equipment, wherein the printing speed of the rotary screen printing equipment is 60-80 m/min, and the utilization rate of the slurry is more than or equal to 95%; a2, drying the printed fabric at 80-100 ℃ for 3-5 minutes, wherein the dry rubbing fastness of the printed layer of the dried fabric is more than or equal to level 4; a3, directly rolling after drying to obtain a finished product, wherein the whole process does not need the procedures of washing, steaming and soaping.
  4. 4. The no-wash slurry formulation according to claim 2, wherein the thickener is one or more of hydroxyethyl cellulose, sodium polyacrylate or xanthan gum, and the thickener is added to make the slurry free of bleeding and blocking during rotary screen printing.
  5. 5. The no-wash slurry formulation of claim 2, wherein the anti-settling agent is one of fumed silica and organobentonite, the 3% anti-settling agent is capable of setting a settling rate of the toner in the nano-color paste to less than or equal to 0.5%/month, and the 2% polycarboxylate dispersant is capable of setting a dispersion particle size deviation of the toner in water to less than or equal to 10nm.
  6. 6. The no-wash slurry formulation according to claim 2, wherein the temperature of the grinding chamber of the sand mill in step S2 is controlled to be 30-50 ℃, so as to avoid dispersant failure caused by grinding temperature rise.
  7. 7. The no-wash slurry formulation according to claim 2, wherein the nano filter in step S3 is a ceramic membrane filter, the filtration pressure is controlled to be 0.2-0.4 mpa, and the filtration efficiency is ensured to be more than or equal to 90%.
  8. 8. The process of claim 3, wherein the screen mesh number of the rotary screen printing device in the step A1 is 80-120 meshes, and the definition of printing lines of the wash-free slurry under the screen is more than or equal to 98%.
  9. 9. The process of claim 3, wherein the fabric is cotton, hemp, silk, wool, chemical fiber or blended fabric thereof, and the retention rate of breaking strength of the fabric after printing and drying is more than or equal to 90%, and the retention rate of tearing strength of the fabric is more than or equal to 85%.
  10. 10. The processing technology of the no-clean slurry according to claim 3, wherein the VOC content of the no-clean slurry is less than 10g/L, the color fastness attenuation rate after the conventional washing is less than or equal to 10 percent after 50 times, the water saving resource is more than or equal to 40 tons per 1000 m of fabric produced, and the hand feeling hardness after the fabric printing is less than or equal to 50Shore A.

Description

No-wash slurry formula and processing technology thereof Technical Field The invention relates to the technical field of textile printing, in particular to a washing-free slurry formula and a processing technology thereof. Background The textile printing is a core process for endowing the fabric with colors and patterns, the market has increasingly urgent requirements on high-efficiency, environment-friendly and high-cost performance wash-free printing technology, wash-free sizing agent is used as a core material and simultaneously meets the requirements of no-water washing fixation, stable colors, soft handfeel and low carbon environmental protection, but has three challenges of difficult performance balance, difficult process simplification and environment-friendly standard reaching difficulty for a long time, the main flow wash-free sizing agent and the process are concentrated in two types of digital direct injection and solvent type, the circular screen printing is high in productivity and wide in adaptability and still has large-scale production main force, but the conventional circular screen printing wash-free sizing agent and the process have various bottlenecks of formula level, the binder mostly adopts common resin or styrene-acrylic ester emulsion, the handfeel is hard when pursued with the fastness, the wet friction fastness is less than or equal to 3 levels of unbalance, the textile color paste is mostly in micron level, a few nano color pastes have the problems of poor dispersing agent consumption, poor anti-settling synergetic property, large particle size deviation and the like, meanwhile the solvent type sizing agent VOC is generally more than 50g/L, and the full-aqueous sizing agent is only suitable for low-mesh screen blocking due to the uncontrolled viscosity; in the aspects of preparation and processing technology, a common ball mill is adopted for mill grinding, the grain diameter D50 is more than 100nm and no precise nano filtration is adopted, part of sand mill is not controlled to cause the failure of dispersing agent, the printing process is more required to be subjected to 7-9 procedures such as printing, steaming, washing, soaping, secondary drying, fixation and the like, the single batch production takes 4-6 hours, the water consumption is 30-50 tons/kilo-square meter fabric, the slurry utilization rate is only 8.5% -15%, the environmental protection and suitability is in the aspect of low VOC slurry always sacrificing fastness, the high-fastness slurry depends on high organic solvent, the attenuation rate of the color fastness of most of slurry washing for 10-15 times is more than 30%, meanwhile, the suitability for fibers is poor, cotton and hemp are easy to bleed, the chemical fiber fastness is low, and part of technologies are only suitable for single fabrics, so that one-machine multi-material production cannot be realized. The existing washing-free sizing agent for textile printing and the processing technology have the technical defects that the formula cooperativity, the process simplicity, the environment protection and the performance are balanced, and the fabric adaptability is outstanding in four dimensions, so that the industry faces the dilemma that the environment protection is not up to standard, the compliance is difficult, the performance is not up to standard, the practicability is difficult, the technology is complicated, the cost is high, and the comprehensive requirements of the fashionable industry on the efficiency, the quality and the environment protection are difficult to meet. The application aims to solve the technical problems of unbalanced performance, low efficiency and high consumption of preparation and printing processes, difficult compromise of environmental protection and usability and narrow fabric adaptability caused by poor formula cooperativity of washing-free sizing agent in the textile field. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide a no-wash slurry formula and a no-wash slurry processing technology, which are suitable for a multi-surface material without pretreatment, so as to meet the high-efficiency green requirement of textile printing. The invention adopts the technical scheme that the washing-free slurry formula comprises, by mass, 20% of Pu2835 aqueous polyurethane emulsion, 3-5% of nano color paste, 75% of water and a proper amount of thickener, wherein after the Pu2835 aqueous polyurethane emulsion is formed into a film, the dry friction fastness is more than or equal to 4 levels, the wet friction fastness is more than or equal to 4 levels, the film forming hardness is less than or equal to 50Shore A, the nano color paste consists of, by mass, 40% of toner, 2% of polycarboxylate dispersant, 1% of thickener, 54% of water and 3% of anti-settling agent, no obvious sediment is generated after the nano color paste is stored for 12 months, and the thickener enables the