A refining agent for pretreatment of dyeing and finishing, its preparation method and application

Abstract

This invention belongs to the field of dyeing and finishing auxiliaries technology, and relates to a refining agent for pretreatment of dyeing and finishing, its preparation method, and its application. It employs a compound of two surfactants and two chelating dispersants for synergistic effect, with isotridecyl alcohol polyoxyethylene polyoxypropylene ether and C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether as the core detergency components, combined with sodium polyacrylate and ethoxypropoxysiloxane chelating dispersants, and formulated with deionized water, resulting in overall stability. The product prepared using this method is stable, environmentally friendly, and has wide process adaptability, suitable for various fabrics and pretreatment processes. It exhibits excellent compatibility with anionic dyes and auxiliaries, and possesses superior wetting and emulsifying, dewaxing and desizing, chelating and softening, dispersing, and anti-staining properties. It can significantly improve the whiteness, wicking effect, and processing quality of dyed and finished fabrics, and has good prospects for industrial application and economic value.

Description

Technical Field

[0001] This invention belongs to the field of dyeing and finishing auxiliaries, specifically relating to a pretreatment refining agent for dyeing and finishing, its preparation method, and its application. This refining agent, as a pretreatment auxiliary, is suitable for integrated pretreatment processes of scouring, desizing, and refining of cotton, linen, and polyester-cotton blended fabrics. It can effectively remove surface contaminants such as sizing agents, cotton wax, pectin, grease, and natural impurities from fabrics, improving fabric absorbency, whiteness, and evenness. Background Technology

[0002] Pretreatment is a fundamental step in textile dyeing and finishing processes. Refining agents, as core auxiliaries, primarily function to remove natural and processing residues from fabrics, improve their absorbency and permeability, and provide qualified greige fabric for subsequent dyeing and printing processes. Currently, most mainstream refining agents on the market are single surfactant systems, which have limited functionality and numerous drawbacks. For example, existing pretreatment refining agents suffer from poor hard water resistance; calcium and magnesium ions in the water easily cause them to deactivate, precipitate, and result in fabric stains and a rough feel. They also have weak dispersion and chelation properties; when using existing refining agents for pretreatment, impurities generated can easily re-adhere onto the fabric, reducing its whiteness and cleanliness.

[0003] Since most existing refining agents only focus on emulsification and decontamination functions and do not achieve the integration of multiple functions such as dispersion, chelation, and anti-re-staining, they are difficult to meet the high-efficiency, low-consumption, and high-quality pretreatment requirements of high-end textiles. Therefore, developing a composite refining agent with good compatibility, hard water resistance, strong chelation, strong penetration, and excellent anti-re-staining effect has important production and application value. Summary of the Invention

[0004] The purpose of this invention is to solve the aforementioned problems in the prior art, and to propose a refining agent for pretreatment in dyeing and finishing, its preparation method, and its application. This invention employs a compound system of two surfactants and two chelating dispersants. Through the scientific compounding and synergistic effect of the components, it solves the technical problems of traditional refining agents, such as incomplete cleaning, poor hard water resistance, easy re-adhesion of impurities, and weak compatibility. Simultaneously, it possesses excellent wetting and emulsification, cleaning and dewaxing, chelating and softening, and dispersing and anti-re-adhesion properties. The refining agent is anionic, the product system is stable, environmentally friendly, and has wide process adaptability, suitable for various fabrics and pretreatment processes. It exhibits excellent compatibility with mainstream anionic dyes and auxiliaries in the dyeing and finishing industry, and can significantly improve the whiteness, wicking effect, and processing quality of dyed and finished fabrics, possessing good prospects for industrial application and economic value.

[0005] The technical solution of this invention is: This invention provides a refining agent for pretreatment before dyeing and finishing. Its core lies in the synergistic effect of the raw material compound system. The compound system consists of two surfactants: isotridecyl alcohol polyoxyethylene polyoxypropylene ether + C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, and two chelating dispersants: sodium polyacrylate (sodium salt) + ethoxypropoxysiloxane. The system comprises the following components by mass percentage: Isotridecyl alcohol polyoxyethylene polyoxypropylene ether 5%–15%; C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether 10%~30%; Sodium polyacrylate 3%–12%; 1%–10% ethoxypropoxysiloxane; The remainder is water.

[0006] Among the above components, isotridecyl alcohol polyoxyethylene polyoxypropylene ether has an excellent branched structure, stronger penetration, and can penetrate deep into fiber gaps and yarn interiors to remove stubborn oil stains and cottonseed hulls. It has good permeability, good emulsification ability for grease, and extremely high washing and cleaning power.

[0007] C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether is a primary emulsifier and detergent, with strong emulsifying power for waxes, pectins, slurries, and machine oils.

[0008] The combination of isotridecyl alcohol polyoxyethylene polyoxypropylene ether and C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether as a diisomeric alcohol ether has super penetrating power and can efficiently remove impurities.

[0009] Ethoxypropoxysiloxane exhibits excellent chelating and dispersing properties for alkaline earth ions and heavy metal ions, serving as a chelating agent and deposit inhibitor. Siloxane, in synergy with isotridecyl alcohol polyoxyethylene polyoxypropylene ether and C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, provides a strong wetting effect. Siloxane reduces surface tension, rapidly wetting cotton / linen / viscose / blended fabrics, with permeability far exceeding that of ordinary fatty alcohol polyoxyethylene ether (AEO) scouring agents, achieving ultimate wetting and spreading.

[0010] The above components work synergistically, resulting in a lower critical micelle concentration and lower interfacial tension after compounding, which significantly improves the impurity removal efficiency compared to single components.

[0011] Sodium polyacrylate has the properties of resisting hard water and preventing redeposition. It complexes calcium, magnesium and iron ions in water to improve the cleaning effect. It has excellent polymer dispersion and anti-re-adhesion properties. It can stably disperse and suspend impurities such as wax, pectin and dye dust from stripped fibers in the working solution, preventing impurities from being re-adsorbed onto the fabric surface, eliminating secondary contamination, and making the whiteness and wicking effect more uniform.

[0012] The above refining agent system is stable as a whole, without stratification or precipitation.

[0013] Furthermore, by weight percentage, it includes the following components: 6%–10% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 12%–20% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 5%–7% sodium polyacrylate, 1%–5% ethoxypropoxysiloxane, and water to make up to 100%.

[0014] Furthermore, by mass percentage, its components are: 7% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 13% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 6% sodium polyacrylate, 1% ethoxypropoxysiloxane, and 73% deionized water.

[0015] This invention also provides a method for preparing any of the above-mentioned dyeing and finishing pretreatment refining agents, comprising the following steps: (1) Set the stirring speed to 50~500 r / min, add the two surfactants to the water in sequence while stirring, and continue stirring at room temperature for 15~20 min until the surfactants are completely dissolved; (2) Continue to add the two chelating dispersants, heat to 45~55℃, and stir continuously for 30~90 min until the system is homogeneous; (3) Let stand for 20-40 minutes to defoam, then filter to obtain the product.

[0016] Furthermore, in step (1), deionized water is first added to the reactor, and stirring is started at a speed of 200-400 r / min; then isotridecyl alcohol polyoxyethylene polyoxypropylene ether and C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether are added to the reactor in sequence, and stirring is continued at room temperature for 15-20 min until the two surfactants are completely dissolved.

[0017] Furthermore, in step (2), sodium polyacrylate and ethoxypropoxysiloxane are added to the reactor, the temperature is raised to 50°C, and the mixture is stirred continuously for 60-80 minutes until the system is uniform and transparent.

[0018] This invention provides an application of the dyeing and finishing pretreatment refining agent as described in any one of the above claims or the preparation method described in any one of the above claims in the dyeing and finishing pretreatment process.

[0019] Furthermore, the refining agent is used in the integrated pretreatment process of scouring, desizing, and refining of fabrics, including cotton, linen, cotton-polyester blends, viscose, polyester blends, and viscose blends.

[0020] The beneficial effects of this invention are: (1) Synergistic effect of composite system: The system is composed of two anionic surfactants and two chelating dispersants. The two surfactants complement each other in terms of wetting, emulsification and decontamination properties, breaking through the functional limitations of single surfactants and greatly improving the removal rate of cotton wax, slurry and oil impurities. The two chelating dispersants work synergistically to take into account the dual effects of metal ion chelation and impurity dispersion to prevent re-adhesion.

[0021] (2) Excellent hard water resistance: It can be adapted to industrial water with different hardness. It does not precipitate, become turbid, or separate in high hardness water. The additives are stable and avoid water stains and color defects on fabrics. At the same time, it can prevent redeposition, reduce scaling, and protect equipment.

[0022] (3) Excellent compatibility: The whole system is an anionic system, which is fully compatible with all anionic auxiliaries and dyes in the dyeing and finishing process, without producing flocculation or precipitation, and without affecting the subsequent processing technology.

[0023] (4) Wide process adaptability: The preparation process provided by this invention is simple, without high temperature and high pressure, energy-saving and environmentally friendly, and is suitable for room temperature and high temperature scouring, intermittent and continuous pretreatment processes. It is applicable to a variety of fabrics such as cotton, linen, polyester-cotton, viscose, polyester and viscose blends. It can be used in one bath / two baths for annealing, scouring and bleaching, and has a wide range of applications.

[0024] (5) Green, environmentally friendly and low-irritant: The formula is free of phosphorus, formaldehyde, heavy metals, APEO, and VOC. It is easy to biodegrade, has a mild odor, meets the environmental protection production standards of the textile industry, is environmentally friendly and degradable, does not damage the fabric, and the treated fabric is soft, has uniform whiteness and stable wool effect. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] To further understand the present invention, the present invention will be further described in conjunction with embodiments.

[0027] In all the following embodiments, unless otherwise specified, the techniques or conditions described in literature, books, papers, etc. in this field can be followed, or the product instructions can be followed. Unless otherwise stated, the raw materials and reagents used in the following embodiments are all industrial-grade textile auxiliaries or other commonly used reagents, which can be purchased from legitimate channels or prepared by known methods; instruments whose manufacturers are not specified are all conventional products, which can be purchased from legitimate channels.

[0028] Example 1 This embodiment provides a refining agent for pretreatment before dyeing and finishing, the components of which, by mass percentage, are: 7% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 13% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 6% sodium polyacrylate, 1% ethoxypropoxysiloxane, and 73% deionized water.

[0029] Weigh the components according to the above mass percentages and use them to prepare a refining agent. The preparation method includes the following steps: (1) Under normal temperature conditions, add a measured amount of deionized water to the reaction vessel and start stirring at a speed of 300 r / min. While stirring, add isotridecyl alcohol polyoxyethylene polyoxypropylene ether and C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether to the water in sequence. Continue stirring at room temperature for 18 min until the two surfactants are completely dissolved. (2) Continue to add sodium polyacrylate and ethoxypropoxysiloxane to the reactor, raise the temperature to 50°C, and stir continuously for 60 min until the system is uniform and transparent; (4) Let stand for 30 minutes to defoam, filter and discharge to obtain the dyeing and finishing pretreatment refining agent.

[0030] The refining agent prepared is a transparent and homogeneous liquid with a stable system that does not separate or precipitate during long-term storage. This integrated pretreatment process is suitable for scouring, desizing, and refining of fabrics such as cotton, linen, polyester-cotton blends, and viscose.

[0031] Example 2 This embodiment provides a refining agent for pretreatment before dyeing and finishing, the components of which, by mass percentage, are: 5% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 20% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 12% sodium polyacrylate, 5% ethoxypropoxysiloxane, and 58% deionized water.

[0032] Weigh the components according to the above mass percentages and use them to prepare a refining agent. The preparation method includes the following steps: (1) At room temperature, add a measured amount of deionized water to the reaction vessel and start stirring at a speed of 100 r / min. While stirring, add isotridecyl alcohol polyoxyethylene polyoxypropylene ether and C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether to the water in sequence. Continue stirring at room temperature for 20 min until the two surfactants are completely dissolved. (2) Continue to add sodium polyacrylate and ethoxypropoxysiloxane to the reactor, raise the temperature to 55°C, and stir continuously for 30 min until the system is uniform and transparent; (4) Let stand for 30 minutes to defoam, filter and discharge to obtain the dyeing and finishing pretreatment refining agent.

[0033] Example 3 This embodiment provides a refining agent for pretreatment before dyeing and finishing, the components of which, by mass percentage, are: 15% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 10% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 3% sodium polyacrylate, 10% ethoxypropoxysiloxane, and 62% deionized water.

[0034] Weigh the components according to the above mass percentages and use them to prepare a refining agent. The preparation method includes the following steps: (1) Under normal temperature conditions, add a measured amount of deionized water to the reaction vessel and start stirring at a speed of 500 r / min. While stirring, add isotridecyl alcohol polyoxyethylene polyoxypropylene ether and C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether to the water in sequence. Continue stirring at room temperature for 15 min until the two surfactants are completely dissolved. (2) Continue to add sodium polyacrylate and ethoxypropoxysiloxane to the reactor, raise the temperature to 45°C, and stir continuously for 90 min until the system is uniform and transparent; (4) Let stand for 30 minutes to defoam, filter and discharge to obtain the dyeing and finishing pretreatment refining agent.

[0035] Example 4 This embodiment provides a refining agent for pretreatment before dyeing and finishing, the components of which, by mass percentage, are: 10% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 30% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 8% sodium polyacrylate, 2% ethoxypropoxysiloxane, and 50% deionized water.

[0036] Weigh the components according to the above mass percentages and use them to prepare the refining agent. The preparation steps are the same as in Example 1.

[0037] Example 5 This embodiment provides a refining agent for pretreatment before dyeing and finishing, the components of which, by mass percentage, are: 10% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 10% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 4% sodium polyacrylate, 3% ethoxypropoxysiloxane, and 73% deionized water.

[0038] Weigh the components according to the above mass percentages and use them to prepare the refining agent. The preparation steps are the same as in Example 1.

[0039] Comparative Example 1 A commercially available, conventional single surfactant refining agent was selected, which does not contain complex chelating and dispersing components.

[0040] Experiment 1 Performance Testing The refining agent prepared in Example 1 of this invention and the commercially available single refining agent in Comparative Example 1 were used to pretreat pure cotton fabric using the same process, and the fabric whiteness, wicking effect and hard water resistance were tested.

[0041] Additives used: refining agent 1g / l, H2O2 (27.5%) 4.4 g / l, NaOH (32%) 4 g / l.

[0042] Process steps: Select the same batch of raw cotton fabric and use tap water (hard water) in a bath ratio of 1:10.

[0043] Group 1: The refining agent prepared in Example 1 of this invention is added; Group 2: Add commercially available single surfactant refining agents.

[0044] In the overflow dyeing machine, the same conditions are used. The raw cotton fabric is added at room temperature. When the temperature is raised to 50°C, one or two groups of auxiliaries are added respectively. Then, H2O2 (27.5%) and NaOH (32%) are added in sequence. The temperature is then raised to 95°C at a rate of 1.5°C / min and kept at that temperature for 40 minutes. The temperature is then lowered to 80°C and the wastewater is drained.

[0045] Sampling and comparison were performed separately.

[0046] The instrument used for whiteness testing was a Datacolor 600 colorimeter.

[0047] Test method: GB / T 8424.2-2001 "Instrumental evaluation method for relative whiteness in color fastness test of textiles".

[0048] The whiteness test results are shown in Table 1.

[0049] Table 1 Whiteness Test Data

[0050] The whiteness of Group 1 was increased by 5.4% compared to Group 2, based on the test data in Table 1.

[0051] The results show that the product of Example 1 of this invention has significantly better performance than the commercially available comparative examples in all aspects. The fabric whiteness is improved by more than 5%, the wicking effect is significantly improved, there is no precipitation under hard water conditions, no impurity re-adhesion, the fabric sample has a soft hand feel, and the overall performance is excellent. After comparison, the second group (Comparative Example 1) products have a stiffer hand feel.

[0052] In addition to its conventional refining function, the refining agent of this invention exhibits exceptionally strong chelating and dispersing properties and hard water resistance, effectively improving fabric whiteness during pretreatment. Ordinary refining agents do not match the effectiveness of this invention. Therefore, in actual production, some manufacturers add chelating and dispersing agents separately to soften the water during pretreatment. Using this invention eliminates the need for a separate chelating and dispersing agent, saving costs.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, alterations, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A refining agent for pretreatment before dyeing and finishing, characterized in that, The system comprises two surfactants and two chelating dispersants, and includes the following components by mass percentage: Isotridecyl alcohol polyoxyethylene polyoxypropylene ether 5%–15%; C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether 10%~30%; Sodium polyacrylate 3%–12%; 1%–10% ethoxypropoxysiloxane; The remainder is water.

2. The refining agent for pretreatment of dyeing and finishing according to claim 1, characterized in that, By weight percentage, it includes the following components: 6%–10% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 12%–20% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 5%–7% sodium polyacrylate, 1%–5% ethoxypropoxysiloxane, and water to make up to 100%.

3. The refining agent for pretreatment of dyeing and finishing according to claim 1, characterized in that, By mass percentage, its components are: 7% isotridecyl alcohol polyoxyethylene polyoxypropylene ether, 13% C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether, 6% sodium polyacrylate, 1% ethoxypropoxysiloxane, and 73% deionized water.

4. The method for preparing the dyeing and finishing pretreatment refining agent according to any one of claims 1-3, characterized in that, Includes the following steps: (1) Set the stirring speed to 50~500 r / min, add the two surfactants to the water in sequence while stirring, and continue stirring at room temperature for 15~20 min until the surfactants are completely dissolved; (2) Continue to add the two chelating dispersants, heat to 45~55℃, and stir continuously for 30~90 min until the system is homogeneous; (3) Let stand for 20-40 minutes to defoam, then filter to obtain the product.

5. The preparation method according to claim 4, characterized in that, In step (1), deionized water is first added to the reactor, and stirring is started at a speed of 200-400 r / min. Then, isotridecyl alcohol polyoxyethylene polyoxypropylene ether and C12-14 alkyl alcohol polyoxyethylene polyoxypropylene ether are added to the reactor in sequence, and stirring is continued at room temperature for 15-20 min until the two surfactants are completely dissolved.

6. The preparation method according to claim 4, characterized in that, In step (2), sodium polyacrylate and ethoxypropoxysiloxane are added to the reactor, the temperature is raised to 50°C, and the mixture is stirred for 60-80 minutes until the system is uniform and transparent.

7. The application of a pre-treatment refining agent for dyeing and finishing as described in any one of claims 1-3 or a pre-treatment refining agent for dyeing and finishing prepared by the preparation method described in any one of claims 4-6 in the pre-treatment process for dyeing and finishing.

8. The application according to claim 7, characterized in that, The refining agent is used in the integrated pretreatment process of scouring, desizing, and refining of fabrics, and the fabrics include cotton, linen, cotton-polyester blends, viscose, polyester blends, and viscose blends.

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