Auxiliary for improving color fastness of textile printing and dyeing and preparation method thereof

Abstract

The application discloses a kind of auxiliary agents for improving textile printing and dyeing color fastness, it relates to textile auxiliary technical field, including the following components by mass fraction: phenoxy resin 20.5-21.0 parts;Silane coupling agent 1.0-1.5 parts;2-butanone 34.5-35.0 parts;3-ethoxy ethyl propionate 11.0-12.0 parts;Mixed xylene 21.5-22.0 parts;Propylene glycol methyl ether acetate 9.5-10.0 parts.The application also discloses a kind of preparation method of the auxiliary agents for improving textile printing and dyeing color fastness as described above.Compared with prior art, the application solves the problem of poor textile printing and dyeing color fastness caused by the fast volatilization speed of existing textile auxiliary, poor film quality.

Description

Technical Field

[0001] This invention relates to the field of textile auxiliaries technology, and in particular to an auxiliary agent for improving the color fastness of textile printing and dyeing, and its preparation method. Background Technology

[0002] Dyes used for textile dyeing typically contain soluble groups, which can easily lead to poor wet rubbing fastness of dyed textiles. During later processing and use, the dye on the fabric can dissociate from the fibers and dissolve in water, causing color changes in the fabric. At the same time, the dissociated dye can stain other fiber fabrics. Even if reactive dyes can form covalent bonds with cellulose fibers, these bonds may break under acidic or alkaline conditions.

[0003] Therefore, when textiles are dyed, textile auxiliaries are typically used to form a protective film on the fiber surface to seal dye molecules and improve printing and color fastness. However, existing textile auxiliaries are prone to poor film uniformity due to their rapid evaporation rate, which in turn leads to poor printing and color fastness of the protective film layer. Summary of the Invention

[0004] The purpose of this invention is to provide an auxiliary agent for improving the printing and dyeing fastness of textiles and its preparation method, so as to solve the problem of poor printing and dyeing fastness of textiles caused by the rapid volatilization rate and poor film-forming quality of existing textile auxiliaries.

[0005] To achieve the above objectives, in one respect, the present invention discloses an auxiliary agent for improving the color fastness of textile printing, comprising the following components in parts by weight:

[0006] 20.5-21.0 parts of phenoxy resin;

[0007] 1.0-1.5 parts of silane coupling agent;

[0008] 34.5-35.0 parts of 2-butanone;

[0009] 11.0-12.0 parts of ethyl 3-ethoxypropionate;

[0010] Mixed xylenes, 21.5-22.0 parts;

[0011] Propylene glycol methyl ether acetate 9.5-10.0 parts.

[0012] On the other hand, the present invention also discloses a method for preparing an auxiliary agent for improving the dyeing fastness of textiles as described above, comprising the following steps:

[0013] S1. Raw material preparation: Prepare the raw materials for the additives according to the above proportions;

[0014] S2, Solvent premixing: Add 60-70% of 2-butanone and 30-40% of mixed xylenes sequentially to the reactor and stir homogenously for 8-12 minutes;

[0015] S3. Preliminary dispersion: Slowly add the solid phenoxy resin to the reactor and stir at room temperature for 5-8 minutes at a stirring speed of 180-200 rpm;

[0016] S4. Heating and dissolving: Turn on the jacket heating of the reactor to heat the internal solution to 60°C in stages, and stir at 300-600 rpm until the solution is transparent and clear;

[0017] S5. Dilution of remaining solvent: Add the remaining 2-butanone, the remaining mixed xylene, propylene glycol methyl ether acetate and ethyl 3-ethoxypropionate to the reaction vessel and stir for 10-30 minutes at a stirring speed of 600-800 rpm.

[0018] S6. Stirring at room temperature: After the temperature of the solution in the reactor is reduced to room temperature, the silane coupling agent is added to the reactor while stirring. The stirring speed is 600-800 rpm, and the stirring is carried out for 15-25 minutes to obtain the auxiliary agent.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] 1. In this invention, the auxiliary agent is a colorless, transparent liquid fixing agent. The auxiliary agent utilizes phenoxy resin to form a continuous polymer protective film on the fiber surface, sealing the dye molecules. The protective film has excellent acid and alkali resistance and is not easily broken, protecting the dye from the acidity or alkalinity of the washing solution, thereby improving the dyeing fastness of textile printing. Furthermore, the auxiliary agent utilizes the chemical bonding of silane coupling agent to promote the formation of covalent bonds between "dye-fiber-resin", solving the problem of resin-fiber interface adhesion and enhancing the durability of the protective layer.

[0021] 2. In this invention, an organic solvent ladder composed of 2-butanone, ethyl 3-ethoxypropionate, mixed xylene, and propylene glycol methyl ether acetate is used to dissolve solid / high viscosity components such as phenoxy resin and silane coupling agent into a uniform colorless and transparent solution. By utilizing the combination of solvents with different boiling points, the volatilization rate of textile auxiliaries is controlled, promoting the penetration of auxiliaries into textile fibers and achieving the effect of "penetration before film formation". The penetration depth of auxiliaries in fibers is adjusted, improving the uniformity, density, and adhesion of the final protective film layer. Color fastness is improved through the synergistic effect of multiple components. Detailed Implementation

[0022] The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] Example 1

[0024] This invention provides a technical solution: an auxiliary agent for improving the color fastness of textile printing, comprising the following components in parts by weight:

[0025] 20.5-21.0 parts of phenoxy resin;

[0026] 1.0-1.5 parts of silane coupling agent;

[0027] 34.5-35.0 parts of 2-butanone;

[0028] 11.0-12.0 parts of ethyl 3-ethoxypropionate;

[0029] Mixed xylenes, 21.5-22.0 parts;

[0030] Propylene glycol methyl ether acetate 9.5-10.0 parts.

[0031] The preparation method of the above-mentioned auxiliary agent for improving the dyeing fastness of textiles includes the following steps:

[0032] S1. Raw material preparation: Prepare the raw materials for the additives according to the above proportions. The solid raw material components are vacuum dried to remove water, with a moisture content of ≤0.1%. The solvent is dehydrated by molecular sieve treatment.

[0033] S2, Solvent premixing: 60-70% of 2-butanone and 30-40% of mixed xylene are added to the reactor in sequence and stirred homogenously for 8-12 minutes to build a stable initial dissolution environment. The strong dissolving power and low viscosity of 2-butanone are used to quickly wet the resin, and xylene is used to help adjust the polarity.

[0034] S3. Preliminary dispersion: Slowly add the solid phenoxy resin to the reactor and stir at room temperature for 5-8 minutes at a stirring speed of 180-200 rpm;

[0035] S4. Heating and dissolving: Turn on the jacket heating of the reactor to heat the internal solution in stages to 60°C. Stir at 300-600 rpm until the solution is transparent and clear, and no undissolved resin particles are visible to the naked eye.

[0036] S5. Dilution of remaining solvent: Add the remaining 2-butanone, the remaining mixed xylene, propylene glycol methyl ether acetate (PMA), and ethyl 3-ethoxypropionate (EEP) to the reactor. First, add ketones to ensure solubility stability, then add high-boiling-point esters to adjust the final volatilization curve. Stir for 10-30 minutes at a stirring speed of 600-800 rpm to ensure that all components are homogeneous.

[0037] S6. Stirring at room temperature: After the solution temperature in the reactor is reduced to room temperature, add the silane coupling agent to the reactor while stirring. The stirring speed is 600-800 rpm, and the stirring time is 15-25 minutes. Control the stirring speed and time of the silane coupling agent to avoid it reacting with the resin hydroxyl groups, which would cause a sharp increase in viscosity or even gelation. Maintain its monomer activity and obtain the additive.

[0038] In step S5, it is preferable to add the remaining mixed xylene, the remaining 2-butanone, propylene glycol methyl ether acetate and ethyl 3-ethoxypropionate to the reactor in sequence according to the polarity gradient, so that the polarity of the system transitions smoothly without sudden changes, avoiding precipitation, clumping and incomplete dissolution of phenoxy resin, and more thorough miscibility of multiple solvents.

[0039] 2-Butanone (MEK) is a ketone solvent that rapidly dissolves resin and promotes the penetration of additives into fibers, but it evaporates quickly. Therefore, the evaporation rate is adjusted using the ester solvent ethyl 3-ethoxypropionate (EEP), which has a strong dissolving power for phenoxy resins. Aromatic solvents mixed with xylene are used to dissolve phenoxy resins and improve film-forming properties. The high boiling point of the ether ester solvent propylene glycol methyl ether acetate (PMA) delays evaporation, allowing for full penetration and leveling of additives.

[0040] The silane coupling agent specifically used is 3-(2,3-epoxypropoxy)propyltrimethoxysilane. 3-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560) has excellent chemical compatibility with phenoxy resin, is not prone to phase separation, and as a silane coupling agent, it is uniformly dispersed in the resin matrix without easily migrating or precipitating. The epoxy groups of KH-560 can undergo ring-opening reactions with the secondary hydroxyl groups on the phenoxy resin molecular chain to form stable chemical bonds. The interfacial bonds formed by the epoxy silane are more stable in humid environments, allowing the additive to significantly improve the adhesion between the coating and textile fibers, making it suitable for textiles that require frequent washing.

[0041] Working Principle: The auxiliary agent is a colorless and transparent liquid fixing agent. It utilizes phenoxy resin to form a continuous polymeric protective film on the fiber surface, sealing dye molecules. This protective film has excellent acid and alkali resistance and is not easily broken, protecting the dye from the acidity or alkalinity of the washing solution, thereby improving the color fastness of textile printing and dyeing. The auxiliary agent utilizes the chemical bonding of silane coupling agents to promote the formation of covalent bonds between the dye, fiber, and resin, solving the problem of resin-fiber interface adhesion and enhancing the durability of the protective layer. An organic solvent ladder composed of 2-butanone, ethyl 3-ethoxypropionate, mixed xylene, and propylene glycol methyl ether acetate is used to dissolve the solid / high viscosity components such as phenoxy resin and silane coupling agents into a uniform colorless and transparent solution. The combination of solvents with different boiling points promotes the penetration of the auxiliary agent into the textile fibers, controls the evaporation rate of the textile auxiliary agent, achieving a "penetration before film formation" effect. This adjusts the penetration depth of the auxiliary agent in the fiber, improving the uniformity, density, and adhesion of the final protective film layer, and enhancing color fastness through the synergistic effect of multiple components.

[0042] Example 2

[0043] Based on the above embodiments, this embodiment further improves upon the following technical solution: In step S1, the phenoxy resin solid is subjected to low-temperature freezing and pre-pulverized to a fineness of 325-400 mesh, and the particle size distribution of the phenoxy resin powder is controlled by airflow sieving.

[0044] To improve the dispersion and dissolution rate of phenoxy resin, the phenoxy resin is pre-crushed. To prevent the polymer phenoxy resin from being difficult to crush to a sufficient fineness at room temperature, it is frozen at low temperature to make the phenoxy resin brittle and hard, thereby preparing an ultrafine powder with a fineness of 325-400 mesh. The coarse and fine particles of the ultrafine powder are separated by blowing high-speed air through a precision sieve, so that the particle size range is concentrated. This not only improves the resin dissolution rate, but also keeps the dissolution rate and viscosity of the phenoxy resin powder stable, avoiding fluctuations in the quality of the additives.

[0045] In addition, when the phenoxy resin powder is subsequently added to the reactor, it is sprinkled in a "rain-like" manner to improve the dissolution rate of the phenoxy resin and to ensure more uniform dispersion in the solvent.

[0046] Example 3

[0047] Based on the above embodiments, this embodiment further improves upon the following technical solution: In step S4, the reaction vessel is first stirred and dispersed at a stirring speed of 300 rpm for 8-10 minutes. During the stirring process, the internal solution is heated to 40°C to achieve swelling of the phenoxy resin, penetration of the solvent into the resin, and softening of the particles. The mildly swollen resin is prevented from structural damage by stirring at a medium speed. Then, the reaction vessel is stirred and dispersed at a stirring speed of 600 rpm, and the internal solution is heated from 40°C to 60°C in steps, with each heating increment being 10°C and held for 5-6 minutes. Undissolved particles are sheared and broken up, and the solution is stirred until it is transparent and clear, and undissolved resin particles are not visible to the naked eye.

[0048] In step S3, the phenoxy resin solid is stirred at low speed at room temperature to achieve wetting and initial dispersion. Then, in step S4, the dissolution temperature and stirring speed are increased simultaneously, so that the softened and dissolved resin is sheared and dispersed by the increased stirring speed, thereby increasing the dissolution rate. The temperature is uniformly conducted through a step-by-step heating method to avoid a sudden temperature rise.

[0049] Example 4

[0050] Based on the above embodiments, this embodiment further improves upon the following technical solution: In step S6, when the silane coupling agent is added to the reactor, it is gradually added dropwise over 10-15 minutes, with the stirring speed of the solution being 600-800 rpm during the dropwise addition. After all the silane coupling agent has been added, the stirring speed is reduced to 200-300 rpm, and the mixture is stirred at low speed for 5-10 minutes to obtain the additive.

[0051] The silane coupling agent is added slowly dropwise, and then rapidly dispersed by high-speed stirring at 600-800 rpm to prevent excessively high local concentrations. After all the silane coupling agent has been added, the stirring speed is reduced to stop strong shearing, and the low-speed curing time is controlled to not exceed 10 minutes to avoid over-reaction. This allows the silane coupling agent to slowly and evenly form a small number of stable chemical bonds with the phenoxy resin, maintaining the activity of the coupling agent without premature gelation. This results in a stronger covalent bond between the dye, fiber, and resin during the use of the additive, and improved color fastness to washing and rubbing.

[0052] Example 5

[0053] Based on the above embodiments, this embodiment further improves upon the following technical solution: In step S6, the prepared additive is subjected to multi-stage precision filtration and vacuum degassing in sequence. The multi-stage precision filtration includes sequential 10μm bag coarse filtration, 1μm PP core filtration and 0.2μm PTFE fine filtration. The vacuum degree during vacuum degassing is -0.08~-0.09MPa, and the degassing time is 10-15 minutes.

[0054] The prepared additive is first subjected to primary coarse filtration at room temperature, using a 10μm bag filter to intercept large particulate impurities, uncrushed resin clumps, and equipment debris. Then, it undergoes preliminary fine filtration using a 1μm PP melt-blown filter cartridge to remove micron-sized resin microgels and fine solid particles. Finally, it undergoes terminal fine filtration using a 0.2μm polytetrafluoroethylene (PTFE) filter cartridge to remove trace amounts of gel, silane hydrolysate polymers, and submicron-sized impurities, resulting in a colorless, transparent, and particle-free additive.

[0055] In addition, during the multi-stage precision filtration process, the operating pressure is controlled to exceed a set threshold to prevent filtration failure.

[0056] The filtered additives are degassed under vacuum to eliminate visible bubbles. After the degassed time is reached, nitrogen is slowly introduced to break the vacuum and prevent resin oxidation and silane hydrolysis. Finally, the finished product is filled into the container.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An auxiliary agent for improving color fastness of textile printing and dyeing, characterized in that, Includes the following components in parts by weight: 20.5-21.0 parts of phenoxy resin; 1.0-1.5 parts of silane coupling agent; 34.5-35.0 parts of 2-butanone; 11.0-12.0 parts of ethyl 3-ethoxypropionate; Mixed xylenes, 21.5-22.0 parts; Propylene glycol methyl ether acetate 9.5-10.0 parts.

2. The auxiliary agent for improving color fastness of textile printing and dyeing according to claim 1, characterized in that, The silane coupling agent is 3-(2,3-epoxypropoxy)propyltrimethoxysilane.

3. A method for preparing an auxiliary agent for improving the dyeing fastness of textiles as described in claim 1 or 2, characterized in that, Includes the following steps: S1. Raw material preparation: Prepare the raw materials for the additives according to the above proportions; S2, Solvent premixing: Add 60-70% of 2-butanone and 30-40% of mixed xylenes sequentially to the reactor and stir homogenously for 8-12 minutes; S3. Preliminary dispersion: Slowly add the solid phenoxy resin to the reactor and stir at room temperature for 5-8 minutes at a stirring speed of 180-200 rpm; S4. Heating and dissolving: Turn on the jacket heating of the reactor to heat the internal solution to 60°C in stages, and stir at 300-600 rpm until the solution is transparent and clear; S5. Dilution of remaining solvent: Add the remaining 2-butanone, the remaining mixed xylene, propylene glycol methyl ether acetate and ethyl 3-ethoxypropionate to the reaction vessel and stir for 10-30 minutes at a stirring speed of 600-800 rpm. S6. Stirring at room temperature: After the temperature of the solution in the reactor is reduced to room temperature, the silane coupling agent is added to the reactor while stirring. The stirring speed is 600-800 rpm, and the stirring is carried out for 15-25 minutes to obtain the auxiliary agent.

4. The method of claim 3, wherein the auxiliary agent for improving color fastness of textile printing and dyeing is prepared by adding 0.1 to 5 wt% of the compound of formula (I) to a textile printing and dyeing auxiliary agent. In step S1, the phenoxy resin solid is subjected to low-temperature freezing and pre-pulverized to a fineness of 325-400 mesh, and the particle size distribution of the phenoxy resin powder is controlled by airflow sieving.

5. The method of claim 3, wherein the auxiliary agent for improving color fastness of textile printing and dyeing is prepared by mixing the above-mentioned components. In step S4, the solution is first stirred and dispersed in the reactor at a stirring speed of 300 rpm for 8-10 minutes. During the stirring process, the internal solution is heated to 40°C to achieve swelling of the phenoxy resin. Then, the solution is stirred and dispersed in the reactor at a stirring speed of 600 rpm, and the internal solution is heated from 40°C to 60°C in steps, with each heating increment being 10°C and held for 5-6 minutes, until the solution becomes transparent and clear.

6. The method of claim 3, wherein the auxiliary agent for improving color fastness of textile printing and dyeing is prepared by mixing the above-mentioned components. In step S5, the remaining mixed xylene, the remaining 2-butanone, propylene glycol methyl ether acetate and ethyl 3-ethoxypropionate are added to the reaction vessel in sequence according to the polarity gradient.

7. The method of claim 3, wherein the auxiliary agent for improving color fastness of textile printing and dyeing is prepared by mixing the above-mentioned components. In step S6, when the silane coupling agent is added to the reactor, it is gradually added dropwise over 10-15 minutes, and the stirring speed of the solution during the dropwise addition is 600-800 rpm. After all the silane coupling agent has been added, the stirring speed is reduced to 200-300 rpm and stirred for 5-10 minutes to obtain the additive.

8. The method of claim 3, wherein the auxiliary agent for improving color fastness of textile printing and dyeing is prepared by mixing the above-mentioned components. In step S6, the prepared additive is subjected to multi-stage precision filtration and vacuum degassing in sequence. The multi-stage precision filtration includes sequential 10μm bag coarse filtration, 1μm PP core filtration and 0.2μm PTFE fine filtration. The vacuum degree during vacuum degassing is -0.08~-0.09MPa, and the degassing time is 10-15 minutes.