A multifunctional reducing cleaning agent and preparation method thereof

Abstract

The invention discloses a multifunctional reducing cleaning agent and a preparation method thereof, and relates to the technical field of textile printing and dyeing auxiliaries. The invention prepares a multifunctional reducing cleaning agent by using a chelating agent, a nonionic surfactant and an anionic surfactant in combination, and then supplemented with other auxiliaries. The multifunctional reducing cleaning agent has an excellent cleaning effect on disperse dyes and can significantly improve the fastness of polyester; has an excellent dispersing effect and can effectively prevent the dyes washed from returning; can achieve a cleaning level similar to that of insurance powder, and is a non-hazardous product; has no effect on active color light, depth, fastness, and fabric strength; is suitable for dispersed active one-bath dyeing and cleaning processes, shortens the process flow, and saves production costs.

Description

Technical Field

[0001] The invention belongs to the technical field of textile printing and dyeing auxiliaries, relates to a reducing cleaning agent, and specifically relates to a multifunctional reducing cleaning agent and a preparation method thereof. Background Art

[0002] After polyester fabrics are dyed with disperse dyes in medium or dark colors, they must be reduced and cleaned. Otherwise, it is difficult to meet various fastness requirements. Through reduction cleaning, not only can the floating color on the fabric surface be removed, but also the oligomers on the fabric surface can be removed to a certain extent. At present, most factories still use insurance powder for reduction cleaning, but insurance powder reduction cleaning has problems such as low utilization rate, poor reduction cleaning effect, strong odor, and unsafe storage. At the same time, it cannot be used after dyeing active on polyester-cotton interwoven or blended fabrics, otherwise it will have a greater impact on the depth and color of the active, and seriously damage the strength of cotton fibers.

[0003] At the same time, the conventional dyeing process for polyester / cotton interwoven or blended fabrics is disperse-active two-bath dyeing: the specific process is disperse dyeing polyester → reduction cleaning → water washing → active dyeing → neutralization → soap washing → water washing. It has the following disadvantages: (1) The processing process is long and has many links, resulting in low production efficiency; (2) There are many production links, the consumption of auxiliaries is large during the processing, the consumption of water, electricity and gas is also high, the labor cost is high, and the overall production cost is high; (3) At the same time, there is a lot of wastewater discharge, which also brings great pressure to wastewater treatment; (4) Insurance powder is a hazardous chemical and has high management and control requirements. With the improvement of environmental protection requirements, the intensification of industry competition and the emergence of new active dyes, in order to shorten the polyester / cotton fabric dyeing process, save energy and reduce emissions, a polyester / cotton fabric disperse / active one-bath dyeing and one-bath washing process has been developed based on the two-bath process. Compared with the conventional two-bath process, the one-bath dyeing and one-bath washing process omits all processes except baking in the dyeing and washing part, greatly shortens the process flow, reduces the consumption of water, electricity and steam, reduces sewage discharge, and improves economic and social benefits.

[0004] The patent (CN111424447A) discloses a one-bath dyeing and finishing process, including a one-bath scouring and dyeing process: at room temperature, according to a bath ratio of 1:8, the polyester fabric is placed in a dyeing vat containing dyeing liquid, heated to 125-135°C, kept warm for dyeing for 30-45 minutes, cooled, drained, washed with water → reduction cleaning: according to a bath ratio of 1:8, the dyed polyester fabric is placed in 2g / l hydrosulfite and 2g / l sodium hydroxide water, reduced and cleaned at 85°C for 10 minutes, drained, and washed with clean water; soft finishing: the polyester fabric after reduction cleaning is immersed in a finishing liquid containing 40g / l silicone oil emulsion, immersed twice and rolled twice, and dried at 210°C. This process adopts a one-bath scouring and dyeing method, but it needs to be washed under alkaline conditions after dyeing.

[0005] The journal literature (Polyester-cotton disperse / active dyeing without reduction cleaning, Cao Wanli et al., Printing and Dyeing, Issue 22) uses the special detergent Span-RT for disperse / active dyeing of polyester-cotton fabrics, which can eliminate the reduction cleaning process after dyeing with disperse dyes and reduce the production time by 2 hours compared with the traditional process; based on a bath ratio of 1:10, the cost of water, electricity, steam and additives can be reduced by 940 yuan per ton of cloth, and the wastewater discharge load can also be reduced, which plays an important role in the development of ecological dyeing technology for polyester-cotton fabrics.

[0006] Patent (CN106048932A) discloses a dyeing method for recycled polyester knitted fabric, comprising the following steps: A. pretreatment; B. dyeing-reduction washing; C. finalizing the finished product. The present invention can make the dyed recycled polyester have a color fastness similar to that of ordinary polyester. The dyeing-reduction one-bath method requires the additional addition of a large amount of caustic soda to be washed under alkaline conditions, which will cause certain damage to the recycled polyester.

[0007] Patent (112593423) discloses a one-bath dyeing-cleaning method for recycled polyester, which comprises the following steps: (1) immersing the recycled polyester knitted fabric in a dyeing solution and dyeing it at a constant temperature; (2) cooling it at a constant temperature after dyeing and performing reduction cleaning, wherein a reduction cleaning agent is added during the reduction cleaning process. The method greatly shortens the total dyeing-cleaning time and total water consumption through the one-bath process of recycled polyester dyeing and reduction cleaning, and the color stability and fastness of the obtained recycled polyester fabric are comparable to those of the traditional two-bath method.

[0008] The patent (CN114438804A) discloses a liquid reducing cleaning agent and its preparation method, which makes full use of the stability of thiourea dioxide, the washing property of the surface or active agent, the dispersibility and adsorption of macromolecular substances, and adopts a synergistic way to return the dyes remaining on the fiber surface to the medium water by washing, reducing, wrapping and adsorbing, and then does not get back on the fiber, so as to achieve the purpose of improving color fastness.

[0009] However, conventional dispersed active one-bath cleaning agents have the disadvantages of either severely damaging active dyes, causing large color changes in fabrics, or having poor cleaning effects. The reducing cleaning agents provided in the above patents and documents still do not solve these drawbacks well. Therefore, it is necessary to provide a multifunctional reducing cleaning agent, which has a good cleaning effect on disperse dyes, and after treatment, the washing fastness and rubbing fastness of fabrics can reach the level of the traditional two-bath process, without any effect on active color light, depth, fastness, and fabric strength, and can save costs and improve production efficiency while maintaining production quality. Summary of the invention

[0010] The present invention aims at the problems existing in the prior art and provides a multifunctional reducing cleaning agent and a preparation method thereof. The present invention prepares a multifunctional reducing cleaning agent by using a chelating agent, a nonionic surfactant and an anionic surfactant in combination, and then supplemented with other auxiliaries. The multifunctional reducing cleaning agent has an excellent cleaning effect on disperse dyes and can significantly improve the fastness of polyester; it has an excellent dispersing effect and can effectively prevent the dyes washed from returning; it can achieve a cleaning level similar to that of insurance powder and is a non-hazardous product; it has no effect on active color light, depth, fastness, and fabric strength; it is suitable for dispersed active one-bath dyeing and cleaning processes, shortens the process flow, and saves production costs.

[0011] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0012] In a first aspect, the present invention provides a multifunctional reducing cleaning agent, comprising the following components in parts by mass:

[0013]

[0014]

[0015] Wherein, the chelating agent is selected from maleic anhydride derivatives, preferably a terpolymer of maleic anhydride, and more preferably a maleic anhydride-acrylic acid-polyoxyethylene ether copolymer.

[0016] Chelating agents can adsorb unreacted hydrolyzed dyes on the fiber surface and can 2+ Mg 2+ The metal ions and impurities are chelated in a three-dimensional multi-ring structure, making the combination formed by these metal ions and impurities appear loose, so the floating color becomes easy to fall off. Therefore, the chelating agent has the function of making the floating color fall off the surface of the fabric. In addition, the chelating agent has a certain chelating ability, which can combine with the floating color dye on the fiber surface to form micelles and then fall off and enter the solution. In addition, the electrostatic force between the chelating agents repel each other and the mechanical force can better remove the floating color, thereby improving the fastness of the dyed product. Maleic anhydride derivatives have excellent chelating and dispersing abilities, and the polymer also has excellent solubilizing properties and colloidal properties. In the chelated water Ca 2+ Mg 2+ At the same time, it can disperse the complex evenly and stably, and can be suitable for various fabric dyeing, printing and washing. It has excellent dispersing and suspending effects. It can make the fabric color uniform when used in dyeing. It is an environmentally friendly and efficient chelating dispersant.

[0017] Among them, the nonionic surfactant is a polyoxyethylene ether surfactant, preferably a fatty alcohol polyoxyethylene ether.

[0018] Wherein, the anionic surfactant is selected from SDS and / or sodium of higher fatty acid.

[0019] Among them, the amount of maleic anhydride derivatives does not exceed 30% of the total amount of maleic anhydride derivatives, nonionic surfactants and anionic surfactants, and the amount of anionic surfactants is not less than 40% of the total amount of maleic anhydride derivatives, nonionic surfactants and anionic surfactants.

[0020] The main function of surfactants in color stripping is to increase the solubility of dyes reduced by reducing agents and dyes hydrolyzed under alkaline conditions in water. Secondly, it can prevent dyes dispersed in water from staining back. In short, it plays an emulsifying and dispersing role on dyes. Specifically, anionic surfactants have strong surface adsorption, strong detergency, and are relatively cheap. The fabric feels good after washing, but they are easily affected by calcium and magnesium ions in water to form insoluble calcium soaps and magnesium soaps. Nonionic surfactants do not dissociate in water, are less sensitive to hard water and electrolytes, have strong detergency, have strong detergency at low concentrations, have low critical micelle concentrations, and have good solubilization ability.

[0021] The dispersant may be any common dispersant in the art, preferably an acrylic dispersant.

[0022] The antibacterial agent is selected from one or more of inorganic antibacterial agents, organic antibacterial agents or natural antibacterial agents, preferably organic antibacterial agents.

[0023] The pH adjuster may be any common pH adjuster in the art, preferably one of glacial acetic acid, ammonium sulfate, an acetic acid buffer system and an ammonium sulfate buffer system.

[0024] By adopting the above scheme, on the one hand, non-ionic surfactants are limited by the cloud point, and the compound compatibility is poor. The compound soaping agent is easy to stratify, which affects the use effect. The compounding of anionic surfactants and non-ionic surfactants can not only make up for the defect of anionic surfactants being sensitive to water quality, but also overcome the difficulty of compound soaping agent stratification caused by the low cloud point of non-ionic surfactants; on the other hand, the difference in structure between traditional chelating agent maleic anhydride-acrylic acid polymers and surfactants (especially polyoxyethylene ethers) makes it difficult to compound them or the compound content is very low, which greatly restricts the use conditions and application scope of chelating dispersants, and polyoxyethylene ether modified Finally, due to the presence of polyoxyethylene ether hydrophilic chain segments, good compounding compatibility with polyoxyethylene ether nonionic surfactants can be achieved, and the addition of anionic surfactants further improves the compounding compatibility between maleic anhydride derivatives and nonionic surfactants, which is more conducive to exerting and combining the respective advantages of the above raw materials. The obtained cleaning agent has a very good cleaning effect on both disperse dyes and reactive dyes, and can be used for disperse-reactive one-bath dyeing and cleaning processes. After treatment, the washing fastness and rubbing fastness of the fabric can reach the level of the traditional two-bath process, and it has no effect on the reactive color light, depth, fastness, and fabric strength. While maintaining production quality, it saves costs and improves production efficiency.

[0025] In a second aspect, the present invention also provides a method for preparing the multifunctional reducing cleaning agent, which specifically comprises the following steps:

[0026] Weigh all raw materials according to the formula, add water into the blender, turn on the blender, then add the raw materials except the pH adjuster in sequence, after stirring evenly, finally add the pH adjuster, when the pH value, sugar content and other physical and chemical indicators meet the standards, you can add the materials.

[0027] Finally, the present invention also provides the use of the multifunctional reducing cleaning agent in a dispersed active one-bath cleaning process.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention adopts a chelating agent, a nonionic surfactant and an anionic surfactant for use in combination, which can improve the compound compatibility of the nonionic surfactant and the chelating agent, and is more conducive to exerting and combining the advantages of the above raw materials. The obtained cleaning agent has a good cleaning effect on both disperse dyes and reactive dyes, among which, it has an excellent cleaning effect on disperse dyes and can significantly improve the fastness of polyester; it has an excellent dispersing effect and can effectively prevent the dyes washed from being stained again; it can achieve a cleaning level similar to that of insurance powder and is a non-hazardous product; it has no effect on the reactive color light, depth, fastness, and fabric strength; it is suitable for dispersed reactive one-bath dyeing and cleaning processes, shortens the process flow, and saves production costs.

[0030] 2. Used in dispersed reactive one-bath dyeing and cleaning processes. The fabric fastness after cleaning is excellent and can reach a level similar to that of the two-bath method. Dispersed reactive one-bath dyeing and one-bath cleaning shorten the process and improve production efficiency compared to the conventional two-bath method. Dispersed reactive one-bath dyeing and one-bath cleaning significantly save production costs in terms of water, electricity, gas, labor, etc. DETAILED DESCRIPTION

[0031] It is worth noting that the raw materials used in the present invention are all common commercially available products, and their sources are not specifically limited.

[0032] The following sources of raw materials are provided for illustrative purposes:

[0033] Maleic anhydride derivatives: maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, commercially available;

[0034] Nonionic surfactants: AEO-3, AEO-9, and peregal-0, commercially available;

[0035] Anionic surfactant: SDS, commercially available;

[0036] Dispersant: acrylic dispersant, commercially available;

[0037] Antimicrobial agent: polyhexamethylene biguanide hydrochloride, commercially available;

[0038] pH adjuster: glacial acetic acid, commercially available.

[0039] Example 1

[0040] The raw materials were weighed according to the following mass parts: 10 parts of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, 20 parts of AEO-3, 20 parts of SDS, 7 parts of dispersant, 0.5 parts of antibacterial agent, 10 parts of pH adjuster, and 15 parts of water to prepare a multifunctional reducing cleaning agent.

[0041] Example 2

[0042] The raw materials were weighed according to the following mass parts: 10 parts of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, 17 parts of AEO-9, 20 parts of SDS, 9 parts of dispersant, 0.5 parts of antibacterial agent, 12 parts of pH adjuster, and 15 parts of water to prepare a multifunctional reducing cleaning agent.

[0043] Example 3

[0044] The raw materials were weighed according to the following mass parts: 20 parts of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer, 8 parts of peregal-03, 40 parts of SDS, 6 parts of dispersant, 0.5 parts of antibacterial agent, 11 parts of pH adjuster, and 15 parts of water to prepare a multifunctional reducing cleaning agent.

[0045] Comparative Example 1

[0046] Except that the amount of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer used is 20 parts, the rest is the same as Example 1.

[0047] Comparative Example 2

[0048] Except that the amount of SDS was 10 parts, the rest was the same as in Example 1.

[0049] Comparative Example 3

[0050] Except that maleic anhydride-acrylic acid-polyoxyethylene ether copolymer is used instead of AEO-3, the rest is the same as Example 1.

[0051] Comparative Example 4

[0052] Except that maleic anhydride-acrylic acid-polyoxyethylene ether copolymer is used instead of SDS, the rest is the same as Example 1.

[0053] Comparative Example 5

[0054] Except that maleic anhydride-acrylic acid-polyoxyethylene ether copolymer is used instead of AEO-3 and SDS, the rest is the same as Example 1.

[0055] Comparative Example 6

[0056] The same procedures as in Example 1 are followed except that maleic anhydride-acrylic acid copolymer is used instead of maleic anhydride-acrylic acid-polyoxyethylene ether copolymer.

[0057] Comparative Example 7

[0058] Except for using PVP to replace AEO-3, the rest is the same as Example 1.

[0059] Comparative Example 8

[0060] The same procedures as in Example 1 are followed except that the maleic anhydride-acrylic acid-PVP copolymer is used instead of the maleic anhydride-acrylic acid-polyoxyethylene ether copolymer.

[0061] Test example

[0062] Experiment 1: Test on the cleaning effect of different detergents on polyester fabrics:

[0063] Formula: different detergents Xg / L; fabric: bright red polyester cloth (GS bright red 3%) 5g; bath ratio 1:20;

[0064] Process: 80℃×20min immersion treatment → washing → drying → testing washing fastness (AATCC 61-2A) and perspiration fastness (alkaline).

[0065] Table 1: Test results of fabric washing fastness after cleaning with different detergents:

[0066]

[0067] It can be seen from the above table that the multifunctional reducing cleaning agents of Examples 1-3 of the present invention have an excellent cleaning effect on polyester fabrics, and can significantly improve the water fastness of the fabrics after cleaning;

[0068] Table 2: Test results of fabric perspiration fastness after cleaning with different detergents:

[0069]

[0070] It can be seen from the above table that the multifunctional reducing cleaning agents of Examples 1-3 of the present invention can significantly improve the sweat fastness of fabrics after cleaning;

[0071] Experiment 2: Test of the effect of different cleaning agents on the color of reactive dyes and the strength of cotton fabrics:

[0072] Recipe: different detergents Xg / L; fabric: gray cotton cloth (40×40 / 133×72); bath ratio 1:20; steel balls: 10 balls / cup;

[0073] Process: 80×20min dipping treatment → washing → drying → testing color difference and strength

[0074] Table 3: Effects of different detergents on the color tone of cotton fabrics:

[0075]

[0076]

[0077] It can be seen from the above table that the multifunctional reducing cleaning agents of Examples 1-3 of the present invention have no effect on the color shade and depth of reactive dyeing.

[0078] Table 4: Effects of different cleaning agents on the strength of cotton fabrics

[0079]

[0080] It can be seen from the above table that the multifunctional reducing cleaning agents of Examples 1-3 of the present invention do not cause severe damage to cotton fabrics.

[0081] Experiment 3: Dispersion force test

[0082] Formula: 10g / L of different cleaning agents + 2.5% calcium carbonate powder; the working solution is prepared in a 100ml stoppered measuring cylinder, shaken and allowed to stand for 30 minutes, 20ml of the working solution is transferred from the 50ml scale, excess hydrochloric acid is added and titrated with NaOH, and finally the calcium carbonate content is calculated.

[0083] Table 5: Dispersibility of different cleaning agents

[0084] sample <![CDATA[Dispersing power (mgCaCO3 / L)]]> Example 1 252 Example 2 239 Example 3 267 Comparative Example 1 200 Comparative Example 2 198 Comparative Example 3 189 Comparative Example 4 178 Comparative Example 5 150 Comparative Example 6 135 Comparative Example 7 180 Comparative Example 8 190 Market Sample 105 Market Sample 2 72

[0085] It can be seen from the above table that the multifunctional reducing cleaning agents of Examples 1-3 of the present invention have excellent dispersibility.

[0086] Experiment 4: Fastness and depth test of T / C fabric after dyeing with different processes

[0087] Recipe sheet:

[0088]

[0089] Note: Cleaning agent RC-L is a reducing cleaning agent made by the applicant, and WRL NEW is an active soaping agent made by the applicant.

[0090] Two-bath process: Padding disperse dyes → drying → baking (205℃×120S) → reduction cleaning → setting drying → padding activity → drying → padding steam solid liquid → steam fixing (saturated steam 90S) → water washing → soap washing → water washing

[0091] One-bath process: rolling disperse and reactive dyes → drying → baking (205℃×120S) → rolling steam solid-liquid → steam fixation (saturated steam 90S) → water washing → soap washing → water washing

[0092] Table 6: Depth and fastness test of fabrics after dyeing with different processes Note: K / S value represents color depth. The larger the K / S value, the darker it is, and the smaller the K / S value, the lighter it is.

[0093]

[0094] It can be seen from the above table that after the multifunctional reducing cleaning agents of Examples 1-3 of the present invention are used for dispersed active one-bath dyeing and one-bath cleaning, the fabric fastness and depth can reach a level similar to that of the normal two-bath method.

[0095] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A multifunctional reducing cleaning agent, characterized in that: The components include the following by mass: Chelating agent 10-20 parts; 20-30 parts of nonionic surfactant; 20-30 parts of anionic surfactant; Dispersant 5-20 parts; Antibacterial agent 0.2-1 part; 10-20 parts of pH regulator; 10-20 parts water; The chelating agent is a maleic anhydride derivative, and the maleic anhydride derivative is a maleic anhydride-acrylic acid-polyoxyethylene ether copolymer; The nonionic surfactant is fatty alcohol polyoxyethylene ether; The anionic surfactant is selected from SDS and / or sodium of higher fatty acids; The amount of chelating agent used shall not exceed 30% of the total amount of chelating agent, nonionic surfactant and anionic surfactant, and the amount of anionic surfactant used shall not be less than 40% of the total amount of chelating agent, nonionic surfactant and anionic surfactant.

2. The multifunctional reducing cleaning agent according to claim 1, characterized in that: The dispersant is an acrylic dispersant; the antibacterial agent is selected from one or more of inorganic antibacterial agents, organic antibacterial agents or natural antibacterial agents; the pH regulator is selected from one of glacial acetic acid, ammonium sulfate, acetic acid buffer system and ammonium sulfate buffer system.

3. The multifunctional reducing cleaning agent according to claim 2, characterized in that: The antibacterial agent is an organic antibacterial agent.

4. A method for preparing the multifunctional reducing cleaning agent according to any one of claims 1 to 3, characterized in that: The method comprises the following steps: weighing various raw materials according to the formula, adding a pH adjuster into water and stirring until the mixture is uniform, and adding other raw materials and stirring until the mixture is uniform.

5. Use of the multifunctional reducing cleaning agent according to any one of claims 1 to 3 or the multifunctional reducing cleaning agent prepared by the preparation method according to claim 4 in a dispersed active one-bath dyeing and cleaning process, characterized in that: The dosage of the multifunctional reducing cleaning agent is 0.5-8 g / L.

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