A method for coating and dyeing a polyester-cotton blended fabric
The continuous pad-dyeing process using POSS-based polyurethane acrylate core-shell emulsion solves the problems of high water and energy consumption in the dyeing of polyester-cotton blended fabrics, achieving energy saving, emission reduction, and improved color fastness, and providing an efficient dyeing method for polyester-cotton blended fabrics.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG GIMARAS NEW MATERIAL CO LTD
- Filing Date
- 2024-12-31
- Publication Date
- 2026-06-30
AI Technical Summary
Existing dyeing processes for polyester-cotton blended fabrics suffer from high water consumption, high energy consumption, and environmental pollution. In particular, high-temperature, high-pressure, and continuous pad dyeing processes result in high chemical oxygen demand in the washing residue, making it difficult to achieve energy conservation, emission reduction, and improve the color performance and color fastness of dyed fabrics.
Using POSS-based polyurethane acrylate core-shell emulsion as a binder, combined with a continuous pad-dyeing process using reactive and disperse dyes, color pastes are prepared and used to dye polyester-cotton blended fabrics, omitting the washing process. The use of POSS-based polyurethane acrylate core-shell emulsion as a binder improves the evenness of dye application.
It enables short-process dyeing and finishing of polyester-cotton blended fabrics, reduces water and energy consumption, improves the color performance and color fastness of dyed fabrics, and reduces environmental pollution.
Smart Images
Figure CN122304210A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of textile dyeing technology, specifically to a method for dyeing polyester-cotton blended fabrics with coatings. Background Technology
[0002] Polyester-cotton blended fabrics combine the excellent properties of both polyester and cotton, such as breathability and comfort, dimensional stability, smoothness and crispness, and easy washing and quick drying, making them widely used in clothing and furniture decoration.
[0003] There are many dyeing methods for polyester and its blended fabrics. Among them, high-temperature high-pressure dyeing and carrier dyeing are intermittent dyeing methods. Because each step of the dyeing process needs to be completed under high temperature conditions, it results in high water and energy consumption, and generates a large amount of water. In continuous pad dyeing of cotton, the dyed fabrics usually need to be reduced and washed, resulting in high chemical oxygen demand (COD) of the soaping residue, causing environmental problems. To address these issues, it is necessary to find a waterless continuous pad dyeing process that eliminates the downstream washing step, achieving energy conservation and emission reduction while improving the color performance and color fastness of the dyed fabrics. Summary of the Invention
[0004] The purpose of this invention is to provide a method for dyeing polyester-cotton blended fabrics with coatings, thereby achieving a short-process dyeing and finishing process for polyester-cotton blended fabrics.
[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:
[0006] A method for dyeing polyester-cotton blended fabrics with coatings, comprising the following steps:
[0007] Prepare color paste;
[0008] Fabric impregnated with color paste;
[0009] Drying, baking;
[0010] The color paste is composed of dye, POSS-based polyurethane acrylate core-shell emulsion, sodium carbonate, sodium alginate, and water.
[0011] The method for preparing the POSS-based polyurethane acrylate core-shell emulsion is as follows:
[0012] 20.0 g of polytetrahydrofuran, 13.0 g of isophorone diisocyanate, and 2.8 g of 2,2-dimethylolpropionic acid were weighed sequentially and added to a three-necked flask equipped with a magnetic stirrer and a condenser. The mixture was heated under nitrogen until the polytetrahydrofuran dissolved. After the system was mixed evenly, 0.05 mL of dibutyltin dilaurate catalyst was added, and the temperature was raised to 80 °C. The reaction was carried out for 1.5 h, and 0.2 g of trimethylolpropane was added. The reaction was continued for 2 h. During this period, the viscosity of the reaction system continued to increase. It was necessary to observe the system regularly and add a small amount of acetone to adjust the viscosity to ensure smooth stirring. After the reaction was completed, the temperature was quickly lowered to 40 °C, and the system was sheared with a paddle. During the stirring process, a mixed solution of 65 mL of distilled water and 1.9 g of triethylamine was added. The system rapidly precipitated and the viscosity decreased. The stirring speed was adjusted to 1200 r / min for 30 min to obtain an aqueous polyurethane emulsion.
[0013] 5g of methyl methacrylate, 11.8g of butyl acrylate, 0.084g of OvPOSS, 0.66g of sodium dodecyl sulfate, 1.98g of dodecylphenol polyoxyethylene ether, and an appropriate amount of distilled water were added to an aqueous polyurethane emulsion. The mixture was sheared and stirred for 30 min, and allowed to swell at room temperature for 24 h. Then, the mixture was stirred under nitrogen atmosphere. 0.168g of azobisisobutyronitrile was weighed as an initiator. 1 / 4 of the initiator was added first, and the temperature was raised to 75℃ after 10 min. After reacting for half an hour, 1 / 2 of the initiator was added, and the reaction was allowed to continue for 1 h. The remaining 1 / 4 of the initiator was then added, and the reaction was continued for 4.5 h to obtain a POSS-based polyurethane acrylate core-shell emulsion.
[0014] The OvPOSS mentioned above is prepared by the following method:
[0015] 7.4 g of vinyltrimethoxysilane, 75 mL of acetone, 12.5 mL of concentrated hydrochloric acid, and 14.8 g of distilled water were weighed sequentially and added to a three-necked flask equipped with a magnetic stir bar and a condenser. The mixture was reacted at 40 °C for 24 h, during which a white precipitate was observed to gradually precipitate. After the reaction was completed, the mixture was filtered and washed several times with acetone. The solid product was then transferred to a glass dish and dried in a vacuum oven for 12 h to obtain the OvPOSS product. The yield was calculated to be 20.48%.
[0016] This invention relates to a method for dyeing polyester-cotton blended fabrics with a coating. The method uses a mixed color paste of adhesive, reactive dyes, and disperse dyes, and employs a continuous pad dyeing process. This method results in a short process flow, energy saving and reduced consumption, and good dye uniformity in the dyeing process. Attached Figure Description
[0017] Figure 1 Example 1: 5K magnification electron microscope image of the dyed fabric.
[0018] Figure 2 Infrared spectrum of POSS-based polyurethane acrylate core-shell emulsion
[0019] Figure 3 Differential scanning calorimetry curve of POSS-based polyurethane acrylate core-shell emulsion film Detailed Implementation
[0020] The present invention will be further illustrated below by way of examples. These examples are only used to explain the present invention and do not constitute any limitation on the claims of the present invention.
[0021] This invention discloses a method for dyeing polyester-cotton blended fabrics with coatings, the specific steps of which are as follows:
[0022] 1) Prepare color paste;
[0023] The color paste is composed of dye, POSS-based polyurethane acrylate core-shell emulsion, sodium carbonate, sodium alginate, and water. The color paste contains 3% dye, 10 g / L of binder core-shell emulsion, and 2 g / L of sodium alginate, with water added to a final volume of 50 g. The pH of the color paste is adjusted to 10-11 with sodium carbonate.
[0024] 2) Fabric is dipped in color paste; two dips and two nips, with a nip-to-liquid ratio of 70%-80%;
[0025] 3) Pre-baking (90℃, 5min) → Baking (150℃, 3min).
[0026] The method for preparing the POSS-based polyurethane acrylate core-shell emulsion is as follows:
[0027] 20.0 g of polytetrahydrofuran, 13.0 g of isophorone diisocyanate, and 2.8 g of 2,2-dimethylolpropionic acid were weighed sequentially and added to a three-necked flask equipped with a magnetic stirrer and a condenser. The mixture was heated under nitrogen until the polytetrahydrofuran dissolved. After the system was mixed evenly, 0.05 mL of dibutyltin dilaurate catalyst was added, and the temperature was raised to 80 °C. The reaction was carried out for 1.5 h, and 0.2 g of trimethylolpropane was added. The reaction was continued for 2 h. During this period, the viscosity of the reaction system continued to increase. It was necessary to observe the system regularly and add a small amount of acetone to adjust the viscosity to ensure smooth stirring. After the reaction was completed, the temperature was quickly lowered to 40 °C, and the system was sheared with a paddle. During the stirring process, a mixed solution of 65 mL of distilled water and 1.9 g of triethylamine was added. The system rapidly precipitated and the viscosity decreased. The stirring speed was adjusted to 1200 r / min for 30 min to obtain an aqueous polyurethane emulsion.
[0028] 5g of methyl methacrylate, 11.8g of butyl acrylate, 0.084g of OvPOSS, 0.66g of sodium dodecyl sulfate, 1.98g of dodecylphenol polyoxyethylene ether, and an appropriate amount of distilled water were added to an aqueous polyurethane emulsion. The mixture was sheared and stirred for 30 min, and allowed to swell at room temperature for 24 h. Then, the mixture was stirred under nitrogen atmosphere. 0.168g of azobisisobutyronitrile was weighed as an initiator. 1 / 4 of the initiator was added first, and the temperature was raised to 75℃ after 10 min. After reacting for half an hour, 1 / 2 of the initiator was added, and the reaction was allowed to continue for 1 h. The remaining 1 / 4 of the initiator was then added, and the reaction was continued for 4.5 h to obtain a POSS-based polyurethane acrylate core-shell emulsion.
[0029] From the appendix Figure 2 It can be seen that at 1556cm -1 1730cm -1 The absorption peaks at 2260 cm⁻¹ correspond to the characteristic peaks of NH₃ and C=O, respectively, while the characteristic peak of -N=C=O (2260 cm⁻¹) is not observed. -1 This indicates that the reaction of the raw material isophorone diisocyanate was relatively complete, with -N=C=O and -OH reacting fully to generate NH-CO; secondly, 841cm -1 The absorption peak at 1110 cm⁻¹ is the characteristic absorption peak of the polyacrylate group -OC₄H₉; the last peak at 1110 cm⁻¹ is the characteristic absorption peak of the polyacrylate group -OC₄H₉; -1 The characteristic peak is the absorption peak of the stretching vibration of the Si-O-Si framework, indicating the presence of POSS component in the emulsion.
[0030] From the appendix Figure 3 It can be seen that as the temperature increases, the glass transition temperature (Tg) of the POSS-based polyurethane acrylate core-shell emulsion film is around 64℃. This indicates that the soft component butyl acrylate in polyacrylate reduces the glass transition temperature of the composite film, while the crosslinking agent OvPOSS improves the flexibility of the film.
[0031] The OvPOSS mentioned above is prepared by the following method:
[0032] 7.4 g of vinyltrimethoxysilane, 75 mL of acetone, 12.5 mL of concentrated hydrochloric acid, and 14.8 g of distilled water were weighed sequentially and added to a three-necked flask equipped with a magnetic stir bar and a condenser. The mixture was reacted at 40 °C for 24 h, during which a white precipitate was observed to gradually precipitate. After the reaction was completed, the mixture was filtered and washed several times with acetone. The solid product was then transferred to a glass dish and dried in a vacuum oven for 12 h to obtain the OvPOSS product. The yield was calculated to be 20.48%.
[0033] Example 1
[0034] A method for dyeing polyester-cotton blended fabrics with coatings, comprising the following steps:
[0035] 1) Prepare color paste;
[0036] The color paste is composed of dye, POSS-based polyurethane acrylate core-shell emulsion, sodium carbonate, sodium alginate, and water. The dye (3%), binder core-shell emulsion (10 g / L), and sodium alginate (2 g / L) are added to a final volume of 50 g of water and stirred until homogeneous. The pH of the color paste is adjusted to 10-11 with sodium carbonate. The dye is reactive fluorescent yellow or disperse fluorescent yellow.
[0037] 2) Fabric is dipped in color paste; two dips and two nips, with a nip-to-liquid ratio of 70%-80%;
[0038] 3) Pre-dry (90℃, 5min) → bake (150℃, 3min) to obtain dyed polyester-cotton blended fabric.
[0039] The aforementioned polyester-cotton blended fabric contains 32% polyester and 68% cotton, with a weight of 280 g / m². 2 .
[0040] From the appendix Figure 1 It can be seen that the film of color paste on the surface of fabric fibers is smooth and has good film-forming properties.
[0041] Example Performance Testing:
[0042] Table 1 Color fastness of dyed fabrics
[0043]
[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A method for dyeing polyester-cotton blended fabric with a coating, comprising the following steps: Prepare color paste; Fabric impregnated with color paste; Drying, baking; The color paste is composed of dye, POSS-based polyurethane acrylate core-shell emulsion, sodium carbonate, sodium alginate, and water.
2. The method for dyeing polyester-cotton blended fabric with coating according to claim 1, characterized in that: The method for preparing the POSS-based polyurethane acrylate core-shell emulsion is as follows: 20.0 g of polytetrahydrofuran, 13.0 g of isophorone diisocyanate, and 2.8 g of 2,2-dimethylolpropionic acid were weighed sequentially and added to a three-necked flask equipped with a magnetic stirrer and a condenser. The mixture was heated under nitrogen until the polytetrahydrofuran dissolved. After the system was mixed evenly, 0.05 mL of dibutyltin dilaurate catalyst was added, and the temperature was raised to 80 °C. The reaction was carried out for 1.5 h, and 0.2 g of trimethylolpropane was added. The reaction was continued for 2 h. During this period, the viscosity of the reaction system continued to increase. It was necessary to observe the system regularly and add a small amount of acetone to adjust the viscosity to ensure smooth stirring. After the reaction was completed, the temperature was quickly lowered to 40 °C, and the system was sheared with a paddle. During the stirring process, a mixed solution of 65 mL of distilled water and 1.9 g of triethylamine was added. The system rapidly precipitated and the viscosity decreased. The stirring speed was adjusted to 1200 r / min for 30 min to obtain an aqueous polyurethane emulsion. 5g of methyl methacrylate, 11.8g of butyl acrylate, 0.084g of OvPOSS, 0.66g of sodium dodecyl sulfate, 1.98g of dodecylphenol polyoxyethylene ether, and an appropriate amount of distilled water were added to an aqueous polyurethane emulsion. The mixture was sheared and stirred for 30 min, and allowed to swell at room temperature for 24 h. Then, the mixture was stirred under nitrogen atmosphere. 0.168g of azobisisobutyronitrile was weighed as an initiator. 1 / 4 of the initiator was added first, and the temperature was raised to 75℃ after 10 min. After reacting for half an hour, 1 / 2 of the initiator was added, and the reaction was allowed to continue for 1 h. The remaining 1 / 4 of the initiator was then added, and the reaction was continued for 4.5 h to obtain a POSS-based polyurethane acrylate core-shell emulsion.
3. The method for dyeing a polyester-cotton blended fabric with a coating according to claim 1, characterized in that: The OvPOSS mentioned above is prepared by the following method: 7.4 g of vinyltrimethoxysilane, 75 mL of acetone, 12.5 mL of concentrated hydrochloric acid, and 14.8 g of distilled water were weighed sequentially and added to a three-necked flask equipped with a magnetic stir bar and a condenser. The mixture was reacted at 40 °C for 24 h, during which a white precipitate was observed to gradually precipitate. After the reaction was completed, the mixture was filtered and washed several times with acetone. The solid product was then transferred to a glass dish and dried in a vacuum oven for 12 h to obtain the OvPOSS product. The yield was calculated to be 20.48%.
4. A coating-dyed polyester-cotton blended fabric, characterized in that: It is made by the paint dyeing method according to any one of claims 1 to 3.