Preparation method of microfiber base cloth with high rubbing fastness

Abstract

The application relates to a preparation method of polyester microfiber base cloth with high rubbing fastness, which adopts low-temperature overflow dyeing of blank cloth with low-temperature disperse dyes, the blank cloth is polyester microfiber base cloth, and the polyester microfiber base cloth is subjected to pre-dyeing treatment before the low-temperature overflow dyeing; the pre-dyeing treatment is that the polyester microfiber base cloth is first immersed in a polyethylene glycol aqueous solution, then washed in water and dried (water is removed from the pore channel after drying, a channel is left for subsequent dyeing), so as to keep the connected pores and fill the unconnected pores; the temperature of the low-temperature overflow dyeing is 80-100 DEG C. The application can realize dyeing at low temperature and normal pressure, avoids the damage of high-pressure dyeing to the organizational form of the polyester microfiber base cloth, is beneficial to improving the color fastness of the polyester microfiber base cloth, and prepares the polyester microfiber base cloth with high rubbing fastness.

Description

Technical Field

[0001] This invention relates to a method for preparing microfiber base fabric, specifically to a dyeing method for obtaining microfiber base fabric with high rubbing color fastness. Background Technology

[0002] Among automotive interior trim materials, headliner fabrics have the largest application area, and the types and performance characteristics of automotive headliner fabrics are of great concern to automakers and R&D personnel. Currently, automotive headliner fabrics mainly fall into three categories: PVC (polyvinyl chloride) fabrics, knitted fabrics, and imitation suede fabrics. Imitation suede fabrics have seen rapid growth in the automotive industry due to their excellent hand feel and plush effect. However, imitation suede materials have a drawback in headliner applications: poor colorfastness to rubbing on dark and brightly colored products.

[0003] Disperse dyeing of polyester typically requires high-temperature, high-pressure dyeing, with temperatures exceeding 120°C. Since water boils at normal pressure (100°C), high pressure is necessary to achieve the required dyeing temperature. When using high-temperature, high-pressure methods to dye microfiber fabrics, the polyester microfibers in the fabric can easily become brittle, even breaking or becoming damaged. This leads to a decrease in the fabric's colorfastness to rubbing (due to severe fiber damage and shedding during rubbing, resulting in uneven color staining).

[0004] To address the aforementioned issues, patent CN116556087A discloses a method for producing biodegradable diacetate fiber fabric. This patent reveals that overflow dyeing of the greige fabric with low-temperature disperse dyes can improve the rubbing fastness of the product. Since the dyeing target is biodegradable diacetate fiber fabric, which is not resistant to low temperatures, it requires the use of low-temperature dyes to achieve high color fastness. However, when the disclosed low-temperature disperse dyes are used to dye polyester microfiber base fabric under overflow dyeing conditions of 95°C and 30 minutes, it is difficult to obtain a base fabric with high rubbing fastness.

[0005] Low-temperature dyeing processes result in base fabrics with poor rubbing fastness, requiring impregnation with fixing agents to achieve excellent rubbing fastness. However, surface fixing agent treatment severely affects the surface feel and hand texture of the base fabric. Therefore, developing polyester microfiber base fabrics with high rubbing fastness using a low-temperature overflow dyeing method is of great significance. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a new method for preparing microfiber base fabric with improved rubbing fastness when using low temperature overflow dyeing in the prior art. The microfiber base fabric prepared by the present invention has high rubbing fastness and high extensibility.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing a microfiber base fabric with high rubbing fastness involves using low-temperature disperse dyes to perform low-temperature overflow dyeing on the fabric. The fabric is a polyester microfiber base fabric. Before low-temperature overflow dyeing, the polyester microfiber base fabric is also subjected to pre-dyeing treatment. The pre-dyeing treatment involves first immersing the polyester microfiber base fabric in a polyethylene glycol aqueous solution, then washing it in water and drying it (after drying, the water leaves the pores, leaving channels for subsequent dyeing) to retain connected pores and fill non-connected pores. The temperature for low-temperature overflow dyeing is 80-100℃.

[0009] As a preferred technical solution:

[0010] The method for preparing a microfiber base fabric with high rubbing color fastness as described above involves a polyethylene glycol number-average molecular weight of 1000-5000, a polyethylene glycol aqueous solution mass concentration of 12-19 wt%, an impregnation temperature of not less than 90℃, an impregnation time of not less than 40 min, and washing in a washing tank with a water circulation rate of 8-12 m³ / min. 3 The washing time is 5-10 minutes per hour. Excessively high number-average molecular weight and concentration of polyethylene glycol (PEG) will lead to excessively high solution viscosity and poor fluidity, which is detrimental to impregnating and filling non-connected pores and makes subsequent channel cleaning difficult, resulting in a worse dyeing effect. Conversely, excessively low PEG molecular weight and concentration will cause the impregnated non-connected pores to be easily washed away, resulting in insignificant color fastness optimization. The impregnation temperature should be at least 90℃ to promote molecular chain movement, allowing the PEG aqueous solution to fully penetrate the interstitial spaces of the microfiber base fabric. The impregnation time should be at least 40 minutes to ensure the pre-dyeing treatment effect and improve the color fastness of subsequent dyeing. After impregnation, the PEG aqueous solution in the channels should be flushed out through a washing tank. Since non-connected pores are tissue dead zones, the PEG aqueous solution is difficult to flush out, resulting in significant residual filling dead zones. The water circulation rate in the washing tank is 8-12 m³ / h. 3 The washing time is 5-10 minutes per hour. Under these conditions, the polyethylene glycol aqueous solution in the microfiber base fabric is not excessively flushed out, nor is insufficient rinsing leading to a large amount of polyethylene glycol residue in the channel, making it difficult to dye.

[0011] The preparation method of the microfiber base fabric with high rubbing color fastness as described above involves a low-temperature overflow dyeing time of 40-60 min and a liquor ratio of 1:10-15.

[0012] To avoid damaging the microstructure of the polyester microfiber base fabric during high-pressure dyeing, this invention limits the low-temperature overflow dyeing temperature to 80-100℃, thus enabling low-temperature overflow dyeing under normal pressure. Because the internal gaps between the polyurethane and polyester fibers are reduced to some extent after special pre-dyeing treatment (due to the filling of some interconnected pores), a relatively longer dyeing time is required compared to traditional low-temperature dyeing processes.

[0013] The preparation method of the microfiber base fabric with high rubbing color fastness described above also includes a surfactant in the dyeing solution used for low-temperature overflow dyeing.

[0014] In the preparation method of the microfiber base fabric with high rubbing fastness as described above, the concentration of low-temperature disperse dye in the dye bath used for low-temperature overflow dyeing is 0.2-1 g / L, and the concentration of surfactant is 0.1-0.5 g / L.

[0015] Low-temperature disperse dyes and surfactants are conventional dyes and dyeing auxiliaries. Low-temperature disperse dyes are a class of dyes that can achieve dyeing at low temperatures of ≤100℃. The low-temperature disperse dyes can be commercially available conventional dyes such as Disperse Yellow Brown XF2, Disperse Yellow E-3G, Disperse Red W-EL, Disperse Red FB, Disperse Deep Blue SWD, and Disperse Blue 2BLN (a tricolor of red, yellow, and blue). Surfactants are a class of conventional dyeing auxiliaries that can help inhibit the aggregation of low-temperature disperse dye particles to form large dispersed phases, thereby obtaining a stable low-temperature disperse dye dispersion paste. The concentrations of the low-temperature disperse dyes and surfactants can be adjusted as needed, which is a conventional adjustment process.

[0016] The preparation method of the microfiber base fabric with high rubbing fastness described above also includes an aromatic organic acid ester in the dyeing solution used for low-temperature overflow dyeing.

[0017] Aromatic organic esters can easily penetrate the amorphous region of polyester fibers. Both aromatic organic esters and PET have aromatic rings and ester groups, which can form hydrogen bonds and van der Waals forces with polyester fibers, weakening the interaction forces between polyester fibers. This has a swelling and plasticizing effect on polyester fibers, reducing the activation energy and increasing the diffusion rate of disperse dyes during dyeing. This makes it easier for dye molecules to enter the polyester fiber molecules, thereby improving the binding of disperse dyes to polyester fibers and promoting the binding of more disperse dyes to the fiber skeleton inside the polyester microfiber base fabric, which is beneficial to improving color fastness.

[0018] In the preparation method of the microfiber base fabric with high rubbing fastness as described above, the concentration of aromatic organic acid esters in the dyeing solution used for low-temperature overflow dyeing is 10-15 g / L.

[0019] In the preparation method of the microfiber base fabric with high rubbing fastness as described above, the aromatic organic acid ester is diisooctyl phthalate.

[0020] The method for preparing a microfiber base fabric with high rubbing fastness as described above involves further color-fixing and cleaning of the polyester microfiber base fabric after low-temperature overflow dyeing. Color-fixing and cleaning is a conventional process, typically using a sodium dithionite cleaning solution with sodium hydroxide as the medium, for example, an aqueous solution containing 8-15 g / L sodium dithionite and 5-10 g / L sodium hydroxide. The color-fixing and cleaning temperature is 70-80℃, the color-fixing and cleaning time is 15-30 min, and the bath ratio is 1:15-30. The color-fixing and cleaning process can be adjusted as needed depending on the actual scheme.

[0021] The method for preparing a microfiber base fabric with high rubbing fastness as described above results in a dry rubbing fastness of the polyester microfiber base fabric reaching grade 3 or higher after color fixing and cleaning.

[0022] Invention Mechanism:

[0023] Microfibers, due to their extremely high specific surface area, can be dyed quickly. The inventors discovered that lowering the dyeing temperature during the dyeing process is beneficial for improving colorfastness. However, the colorfastness of polyester microfiber base fabrics dyed at low temperatures is very low. The reason is speculated to be that most dyes do not actually penetrate the internal fiber structure and are absorbed by the microfibers. The polyurethane in the microfiber base fabric has a porous structure, giving it a unique feel. However, not all the pores in the polyurethane are interconnected; some are non-connected. During dyeing, the walls of these non-connected pores hinder the dye liquor from penetrating into the microfibers, affecting the microfibers' adsorption of dye. These non-connected pores act as dead zones for flow. As the dye liquor is continuously absorbed by the walls of these non-connected pores, the internal microfibers cannot absorb the dye for dyeing. Later, the dye stored in the pore walls of these non-connected pores is easily removed, resulting in poor colorfastness of the microfiber base fabric.

[0024] This invention employs a polyethylene glycol (PEG) aqueous solution for pre-dyeing treatment of microfiber fabric. After the microfiber fabric is impregnated with low molecular weight PEG, the PEG enters the fabric along the gaps between the fibers and the polyurethane, filling both connected and non-connected pores. During subsequent rinsing for a certain period, most of the PEG in the connected pores is removed during the short rinsing process, as the non-connected pores represent a dead zone for flow. However, it is difficult to remove most of the PEG from the non-connected pores, as the PEG effectively fills the non-connected pores. In the subsequent overflow dyeing process, the PEG, with its relatively low molecular weight, has limited dye adsorption capacity, hindering the dye solution from entering the non-connected pores and helping the dye flow along the connected pores into the fiber gaps, thus promoting dye adsorption by the microfibers.

[0025] Beneficial effects:

[0026] (1) The dyeing solution used in this invention contains low-temperature disperse dyes and aromatic organic acid esters, which can be used for dyeing at low temperature and normal pressure, avoiding damage to the structure of polyester microfiber base fabric by high-pressure dyeing, and at the same time improving the color fastness of polyester microfiber base fabric.

[0027] (2) In this invention, polyethylene glycol is first used to pre-dye the polyester microfiber base fabric, and then the polyester microfiber base fabric is subjected to low-temperature overflow dyeing, which improves the rubbing fastness of the polyester microfiber base fabric. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0029] The liquor ratio data in this invention refers to the mass ratio of the prepared pretreatment solution, dyeing solution, color-fixing cleaning solution, and other treatment solutions to the microfiber base fabric.

[0030] The following are the performance testing methods described in the examples:

[0031] Dry rubbing fastness: The rubbing fastness test 6.2 was conducted according to the method in GB / T 3920-2008 "Textiles - Tests for color fastness - Color fastness to rubbing". The pressure was 9N, and a total of 10 cycles of rubbing were performed. The instrument used for the test was a dry and wet rubbing fastness tester. The staining rating was then determined according to GB / T251-2008 "Textiles - Tests for color fastness - Assessment - Gray scale for staining".

[0032] Touch feel: Compare the difference in feel of the polyester microfiber base fabric before and after dyeing. If there is basically no difference, it is marked as ○; if it becomes obviously harder, it is marked as ×.

[0033] K / S value: Tested using an X-Rite Color-Eye 7000A spectrophotometer with a D65 light source and a 10° viewing angle. The dyed fabric was folded twice, and three points were measured. The average value was taken. The K / S value was finally calculated using the Kubela-Munk function: K / S = (1-R) 2 / 2R, where K is the absorption coefficient of the object being measured, S is the scattering coefficient of the object being measured, and R is the reflectivity of the object being measured when it is infinitely thick; the larger the K / S value, the better the staining performance.

[0034] Example 1

[0035] A method for preparing a microfiber base fabric with high rubbing color fastness, comprising the following steps:

[0036] (1) Preparation of raw materials;

[0037] Polyester microfiber base fabric: Manufacturer is Shanghai Huafeng Microfiber Technology Co., Ltd., brand name is DE;

[0038] Polyethylene glycol aqueous solution: concentration of 12wt%, solute is polyethylene glycol (number average molecular weight of 5000);

[0039] Low-temperature disperse dyes: Manufacturer: DyStar, Brand: DyStar Yellow Brown XF2;

[0040] Aromatic organic esters: The organic ester is diisooctyl phthalate;

[0041] water;

[0042] Sodium dithionite cleaning solution with sodium hydroxide medium: a mixture of sodium dithionite, sodium hydroxide and water, wherein the concentration of sodium dithionite is 8 g / L and the concentration of sodium hydroxide is 5 g / L;

[0043] (2) First, at a temperature of 90℃, the polyester microfiber base fabric is immersed in a polyethylene glycol aqueous solution at a bath ratio of 1:10 for 60 minutes. Then, the polyester microfiber base fabric is immersed in a water circulation system with a flow rate of 8m³ / min. 3 Clean in a cleaning tank at 20℃ for 10 minutes per hour, and finally dry at 110℃ for 2 hours.

[0044] (3) Prepare the dye solution;

[0045] The dye solution is obtained by mixing low-temperature disperse dye, aromatic organic acid ester and water evenly; wherein the concentration of low-temperature disperse dye is 0.2 g / L and the concentration of aromatic organic acid ester is 10 g / L.

[0046] (4) First, under the condition of 100℃, use the dyeing solution prepared in step (3) to dye the polyester microfiber base fabric after treatment in step (2) at a bath ratio of 1:10 for 60 minutes. Then, at a temperature of 70℃, use sodium dithionite cleaning solution with sodium hydroxide medium at a bath ratio of 1:15 to clean the polyester microfiber base fabric for 15 minutes to obtain microfiber base fabric with high rubbing fastness.

[0047] All of the above steps are performed at normal pressure (i.e., standard atmospheric pressure).

[0048] The resulting microfiber base fabric with high rubbing color fastness has a K / S value of 7, a dry rubbing color fastness of grade 4, and a touch feel of ○.

[0049] Comparative Example 1

[0050] A method for preparing a colored microfiber base fabric is basically the same as in Example 1, except that the number average molecular weight of the polyethylene glycol in the polyethylene glycol aqueous solution prepared in step (1) is 6000 and the mass concentration of the polyethylene glycol aqueous solution is 20wt%.

[0051] The final colored microfiber base fabric has a K / S value of 3.6, a dry rubbing color fastness of less than grade 1, and a touch feel of 0.

[0052] Comparing Comparative Example 1 and Example 1, it can be seen that the polyethylene glycol in Comparative Example 1 has a high number-average molecular weight and high mass concentration, which leads to a high viscosity and poor fluidity of the polyethylene glycol aqueous solution. This is not conducive to impregnating and filling non-connected cells, and makes subsequent channel cleaning difficult, resulting in a worse dyeing effect.

[0053] Comparative Example 2

[0054] A method for preparing a colored microfiber base fabric is basically the same as in Example 1, except that the number average molecular weight of the polyethylene glycol in the polyethylene glycol aqueous solution prepared in step (1) is 800 and the mass concentration of the polyethylene glycol aqueous solution is 8wt%.

[0055] The final colored microfiber base fabric has a K / S value of 6.5, a dry rubbing color fastness of 2.5, and a touch feel of 0.

[0056] Comparing Comparative Example 2 and Example 1, it can be seen that the dry rubbing color fastness of the colored microfiber base fabric is reduced because the molecular weight of polyethylene glycol used in Comparative Example 2 is too small and the mass concentration of polyethylene glycol aqueous solution is too low. This is because the concentration of polyethylene glycol aqueous solution is too low and the number average molecular weight of polyethylene glycol is too small, so the non-connected pores filled during impregnation are easily washed away, resulting in an insignificant effect on color fastness optimization.

[0057] Comparative Example 3

[0058] A method for preparing a colored microfiber base fabric is basically the same as in Example 1, except that the impregnation temperature of the polyester microfiber base fabric in step (2) is 80°C and the impregnation time is 30 min.

[0059] The final colored microfiber base fabric has a K / S value of 6.3, a dry rubbing color fastness of 2.5, and a touch feel of 0.

[0060] Comparing Comparative Example 3 and Example 1, it can be seen that the impregnation of the polyester microfiber base fabric in Comparative Example 3 was insufficient because the impregnation temperature was too low and the impregnation time was too short. This is because polyethylene glycol with a certain molecular weight requires more heat energy and time to move. The impregnation temperature should be at least 90°C and the impregnation time should be at least 40 minutes to promote the movement of molecular chains and allow the polyethylene glycol aqueous solution to fully enter the gaps in the microfiber base fabric structure and fill the pores.

[0061] Comparative Example 4

[0062] A method for preparing a colored microfiber base fabric is basically the same as in Example 1, except that the cleaning time of the polyester microfiber base fabric in step (2) is 4 min.

[0063] The final colored microfiber base fabric has a K / S value of 4, a dry rubbing color fastness of less than 1, and a touch feel of 0.

[0064] Comparing Comparative Example 4 and Example 1, it can be seen that the dry rubbing color fastness of the colored microfiber base fabric decreased because the cleaning time of the polyester microfiber base fabric in Comparative Example 4 was too short. This is because the cleaning time of the polyester microfiber base fabric was too short, and a large amount of polyethylene glycol remained in the interconnecting channels after drying, which affected the coloring effect of subsequent overflow dyeing.

[0065] Comparative Example 5

[0066] A method for preparing a colored microfiber base fabric is basically the same as in Example 1, except that the cleaning time of the polyester microfiber base fabric in step (2) is 15 min.

[0067] The final colored microfiber base fabric has a K / S value of 6.5, a dry rubbing color fastness of grade 2, and a touch feel of 0.

[0068] Comparing Comparative Example 5 and Example 1, it can be seen that the dry rubbing color fastness performance of the colored microfiber base fabric decreased because the cleaning time of the polyester microfiber base fabric in Comparative Example 5 was too long. This is because the cleaning time of the polyester microfiber base fabric was too long, and more of the polyethylene glycol that filled the non-connected cells during impregnation was washed away, resulting in an insignificant effect on color fastness optimization.

[0069] Comparative Example 6

[0070] A method for preparing a colored microfiber base fabric, comprising the following steps:

[0071] (1) Preparation of raw materials;

[0072] Polyester microfiber base fabric: Manufacturer is Shanghai Huafeng Microfiber Technology Co., Ltd., brand name is DE;

[0073] Low-temperature disperse dyes: Manufacturer: DyStar, Brand: DyStar Yellow Brown XF2;

[0074] Aromatic organic esters: The organic ester is diisooctyl phthalate;

[0075] water;

[0076] Sodium dithionite cleaning solution with sodium hydroxide medium: a mixture of sodium dithionite, sodium hydroxide and water, wherein the concentration of sodium dithionite is 8 g / L and the concentration of sodium hydroxide is 5 g / L;

[0077] (2) Prepare the dye solution;

[0078] The dye solution is obtained by mixing low-temperature disperse dye, aromatic organic acid ester and water evenly; wherein the concentration of low-temperature disperse dye is 0.2 g / L and the concentration of aromatic organic acid ester is 10 g / L.

[0079] (3) First, under the condition of 100℃, use the polyester microfiber base fabric from step (1) and the dyeing solution prepared in step (2) at a bath ratio of 1:10 to perform low-temperature overflow dyeing for 60 minutes. Then, at a temperature of 70℃, use sodium dithionite cleaning solution with sodium hydroxide medium at a bath ratio of 1:15 to clean the polyester microfiber base fabric for 15 minutes to obtain colored microfiber base fabric.

[0080] All of the above steps are performed at normal pressure (i.e., standard atmospheric pressure).

[0081] The final colored microfiber base fabric has a K / S value of 5.8, a dry rubbing color fastness of 1.5, and a touch feel of 0.

[0082] Comparing Comparative Example 6 and Example 1, it can be seen that since the non-connected pores inside the polyester microfiber base fabric of Comparative Example 6 are not filled with polyethylene glycol aqueous solution, it will hinder the dye solution from penetrating into the microfiber and affect the adsorption of dye by the microfiber. At the same time, the dye stored in the pore walls of the non-connected pores is easy to be removed, resulting in the microfiber base fabric exhibiting poor color fastness.

[0083] Example 2

[0084] A method for preparing a microfiber base fabric with high rubbing color fastness, comprising the following steps:

[0085] (1) Preparation of raw materials;

[0086] Polyester microfiber base fabric: Manufacturer is Shanghai Huafeng Microfiber Technology Co., Ltd., brand name is DE;

[0087] Polyethylene glycol aqueous solution: concentration of 13wt%, solute is polyethylene glycol (number average molecular weight of 4000);

[0088] Low-temperature disperse dye: Manufacturer: Archroma, Brand: Torres Disperse Red W-EL;

[0089] Surfactant: Manufacturer is Shanghai Yayun Company, brand name is Yakeyun CV-70;

[0090] Aromatic organic esters: The organic ester is diisooctyl phthalate;

[0091] water;

[0092] Sodium dithionite cleaning solution with sodium hydroxide medium: a mixture of sodium dithionite, sodium hydroxide and water, wherein the concentration of sodium dithionite is 10 g / L and the concentration of sodium hydroxide is 7 g / L;

[0093] (2) First, at a temperature of 90℃, the polyester microfiber base fabric is immersed in a polyethylene glycol aqueous solution at a bath ratio of 1:20 for 40 minutes. Then, the polyester microfiber base fabric is immersed in a water circulation system with a flow rate of 9m³ / min. 3 Clean in a cleaning tank at 30℃ for 8 minutes per hour, and finally dry at 110℃ for 2 hours.

[0094] (3) Prepare the dye solution;

[0095] The dye solution is obtained by mixing low-temperature disperse dye, surfactant, aromatic organic acid ester and water evenly; wherein the concentration of low-temperature disperse dye is 0.4 g / L, the concentration of surfactant is 0.1 g / L and the concentration of aromatic organic acid ester is 12 g / L.

[0096] (4) First, under the condition of 90°C, use the dyeing solution prepared in step (3) to dye the polyester microfiber base fabric after treatment in step (2) at a bath ratio of 1:10 for 55 minutes. Then, at a temperature of 75°C, use sodium dithionite cleaning solution with sodium hydroxide medium at a bath ratio of 1:15 to clean the polyester microfiber base fabric for 30 minutes to obtain microfiber base fabric with high rubbing fastness.

[0097] All of the above steps are performed at normal pressure (i.e., standard atmospheric pressure).

[0098] The resulting high-rubbing color fastness microfiber base fabric has a K / S value of 8.5, a dry rubbing color fastness of 4.5, and a touch feel of ○.

[0099] Example 3

[0100] A method for preparing a microfiber base fabric with high rubbing color fastness, comprising the following steps:

[0101] (1) Preparation of raw materials;

[0102] Polyester microfiber base fabric: Manufacturer is Shanghai Huafeng Microfiber Technology Co., Ltd., brand name is DE;

[0103] Polyethylene glycol aqueous solution: concentration of 15 wt%, solute is polyethylene glycol (number average molecular weight of 3000);

[0104] Low-temperature disperse dyes: Manufacturer: Shanghai Yayun Company, Brand: Deep Blue SWD;

[0105] Aromatic organic esters: The organic ester is diisooctyl phthalate;

[0106] water;

[0107] Sodium dithionite cleaning solution with sodium hydroxide medium: a mixture of sodium dithionite, sodium hydroxide and water, wherein the concentration of sodium dithionite is 12 g / L and the concentration of sodium hydroxide is 8 g / L;

[0108] (2) First, at a temperature of 95℃, the polyester microfiber base fabric is immersed in a polyethylene glycol aqueous solution at a bath ratio of 1:30 for 50 minutes. Then, the polyester microfiber base fabric is immersed in a water circulation system with a flow rate of 10m³ / min. 3 Clean in a cleaning tank at 40℃ for 8 minutes per hour, and finally dry at 110℃ for 2 hours.

[0109] (3) Prepare the dye solution;

[0110] The dye solution is obtained by mixing low-temperature disperse dye, aromatic organic acid ester and water evenly; wherein the concentration of low-temperature disperse dye is 0.5 g / L and the concentration of aromatic organic acid ester is 12 g / L.

[0111] (4) First, under the condition of 80°C, use the dyeing solution prepared in step (3) to dye the polyester microfiber base fabric after treatment in step (2) at a bath ratio of 1:12 for 50 minutes at low temperature overflow. Then, at the temperature of 80°C, use sodium dithionite cleaning solution with sodium hydroxide medium at a bath ratio of 1:20 to clean the polyester microfiber base fabric for 15 minutes to obtain microfiber base fabric with high rubbing fastness.

[0112] All of the above steps are performed at normal pressure (i.e., standard atmospheric pressure).

[0113] The resulting microfiber base fabric with high rubbing color fastness has a K / S value of 8.7, a dry rubbing color fastness of 4.5, and a touch feel of ○.

[0114] Example 4

[0115] A method for preparing a microfiber base fabric with high rubbing color fastness, comprising the following steps:

[0116] (1) Preparation of raw materials;

[0117] Polyester microfiber base fabric: Manufacturer is Shanghai Huafeng Microfiber Technology Co., Ltd., brand name is TW;

[0118] Polyethylene glycol aqueous solution: concentration of 18 wt%, solute is polyethylene glycol (number average molecular weight of 2000);

[0119] Low-temperature disperse dyes: Manufacturer: DyStar, Brand: DyStar Yellow Brown XF2;

[0120] Surfactant: Manufacturer is Shanghai Yayun Company, brand name is Yakeyun CV-70;

[0121] Aromatic organic esters: The organic ester is diisooctyl phthalate;

[0122] water;

[0123] Sodium dithionite cleaning solution with sodium hydroxide medium: a mixture of sodium dithionite, sodium hydroxide and water, wherein the concentration of sodium dithionite is 15 g / L and the concentration of sodium hydroxide is 10 g / L;

[0124] (2) First, at a temperature of 95℃, the polyester microfiber base fabric is immersed in a polyethylene glycol aqueous solution at a bath ratio of 1:40 for 50 minutes. Then, the polyester microfiber base fabric is immersed in a water circulation system with a flow rate of 11m³ / min. 3 Clean in a cleaning tank at 25℃ for 10 minutes per hour, and finally dry at 110℃ for 2 hours.

[0125] (3) Prepare the dye solution;

[0126] The dye solution is obtained by mixing low-temperature disperse dye, surfactant, aromatic organic acid ester and water evenly; wherein the concentration of low-temperature disperse dye is 0.8 g / L, the concentration of surfactant is 0.3 g / L and the concentration of aromatic organic acid ester is 15 g / L.

[0127] (4) First, under the condition of 90°C, use the dyeing solution prepared in step (3) to dye the polyester microfiber base fabric after treatment in step (2) at a bath ratio of 1:15 for 45 minutes. Then, at the temperature of 80°C, use sodium dithionite cleaning solution with sodium hydroxide medium at a bath ratio of 1:25 to clean the polyester microfiber base fabric for 25 minutes to obtain microfiber base fabric with high rubbing fastness.

[0128] All of the above steps are performed at normal pressure (i.e., standard atmospheric pressure).

[0129] The final microfiber base fabric with high rubbing color fastness has a K / S value of 9.6, a dry rubbing color fastness of grade 4, and a touch feel of ○.

[0130] Example 5

[0131] A method for preparing a microfiber base fabric with high rubbing color fastness, comprising the following steps:

[0132] (1) Preparation of raw materials;

[0133] Polyester microfiber base fabric: Manufacturer is Shanghai Huafeng Microfiber Technology Co., Ltd., brand name is TW;

[0134] Polyethylene glycol aqueous solution: concentration of 19 wt%, solute is polyethylene glycol (number average molecular weight of 1000);

[0135] Low-temperature disperse dyes: Manufacturers include Archroma and Torres Disperse Red W-EL;

[0136] Surfactant: Manufacturer is Shanghai Yayun Company, brand name is Yakeyun CV-70;

[0137] Aromatic organic esters: The organic ester is diisooctyl phthalate;

[0138] water;

[0139] Sodium dithionite cleaning solution with sodium hydroxide medium: a mixture of sodium dithionite, sodium hydroxide and water, wherein the concentration of sodium dithionite is 8 g / L and the concentration of sodium hydroxide is 10 g / L;

[0140] (2) First, at a temperature of 100℃, the polyester microfiber base fabric is immersed in a polyethylene glycol aqueous solution at a bath ratio of 1:50 for 40 minutes. Then, the polyester microfiber base fabric is immersed in a water circulation system with a flow rate of 12m³ / min. 3 Clean in a cleaning tank at 35℃ for 5 minutes per hour, and finally dry at 110℃ for 2 hours.

[0141] (3) Prepare the dye solution;

[0142] The dye solution is obtained by mixing low-temperature disperse dye, surfactant, aromatic organic acid ester and water evenly; wherein the concentration of low-temperature disperse dye is 1 g / L, the concentration of surfactant is 0.5 g / L and the concentration of aromatic organic acid ester is 15 g / L.

[0143] (4) First, under the condition of 90°C, use the dyeing solution prepared in step (3) to dye the polyester microfiber base fabric after treatment in step (2) at a bath ratio of 1:15 for 40 minutes. Then, at a temperature of 70°C, use sodium dithionite cleaning solution with sodium hydroxide medium at a bath ratio of 1:30 to clean the polyester microfiber base fabric for 20 minutes to obtain microfiber base fabric with high rubbing fastness.

[0144] All of the above steps are performed at normal pressure (i.e., standard atmospheric pressure).

[0145] The final microfiber base fabric with high rubbing color fastness has a K / S value of 10.2, a dry rubbing color fastness of grade 4, and a touch feel of ○.

[0146] Example 6

[0147] A method for preparing a microfiber base fabric with high rubbing color fastness is basically the same as in Example 1, except that: in step (1), aromatic organic acid esters are not prepared, and in step (3), the aromatic organic acid esters are replaced with an equal mass of water.

[0148] The resulting microfiber base fabric with high rubbing color fastness has a K / S value of 6.2, a dry rubbing color fastness of 3.5, and a touch feel of ○.

[0149] Comparing Examples 6 and 5, it can be seen that the absence of aromatic organic acid esters in Example 6 leads to a decrease in the dry rubbing color fastness of the prepared microfiber base fabric with high rubbing color fastness. This is because aromatic organic acid esters increase the diffusion rate of disperse dyes during dyeing, making it easier for dye molecules to enter the polyester fiber molecules, thereby improving the binding affinity between disperse dyes and polyester fibers and promoting the more disperse dyes are bound to the fiber skeleton inside the polyester microfiber base fabric, which is beneficial to the improvement of color fastness. However, since no aromatic organic acid esters were added in Example 6, the diffusion rate of disperse dyes decreased, affecting the binding affinity between disperse dyes and the fiber skeleton inside the polyester microfiber base fabric, thus leading to a decrease in the dry rubbing color fastness of the microfiber base fabric.

Claims

1. A method for preparing a microfiber base fabric with high rubbing fastness, comprising low-temperature overflow dyeing of the fabric with low-temperature disperse dye, characterized in that, The fabric is a polyester microfiber base fabric, in which the polyurethane has a cellular structure, consisting of interconnected and non-interconnected cellular structures. Before low-temperature overflow dyeing, the polyester microfiber base fabric undergoes a pre-dyeing treatment, which involves immersing the fabric in a polyethylene glycol aqueous solution, washing it in water, and then drying it to retain interconnected cellular structures and fill the non-interconnected cellular structures. The low-temperature overflow dyeing temperature is 80-100℃, and washing is carried out in a washing tank with a water circulation rate of 8-12 m³ / h. 3 / h; The number average molecular weight of polyethylene glycol is 1000-5000, the mass concentration of polyethylene glycol aqueous solution is 12-19wt%, the immersion temperature is not lower than 90℃, the immersion time is not lower than 40min, and the cleaning time is 5-10min. The low-temperature overflow staining time is 40-60 min, and the bath ratio is 1:10-15; The dye solution used in low-temperature overflow staining also contains aromatic organic acid esters; the concentration of aromatic organic acid esters in the dye solution used in low-temperature overflow staining is 10-15 g / L.

2. The method for preparing a microfiber base fabric with high rubbing fastness according to claim 1, characterized in that, Low-temperature overflow staining uses dye solutions that also contain surfactants.

3. The method for preparing a microfiber base fabric with high rubbing fastness according to claim 2, characterized in that, The concentration of low-temperature disperse dye in the dye solution used for low-temperature overflow dyeing is 0.2-1 g / L, and the concentration of surfactant is 0.1-0.5 g / L.

4. The method for preparing a microfiber base fabric with high rubbing fastness according to claim 1, characterized in that, The aromatic organic acid ester is diisooctyl phthalate.

5. The method for preparing a microfiber base fabric with high rubbing fastness according to claim 1, characterized in that, After low-temperature overflow dyeing, the polyester microfiber base fabric is also subjected to color-fixing cleaning.

6. The method for preparing a microfiber base fabric with high rubbing fastness according to claim 5, characterized in that, After color fixing and cleaning, the dry rubbing color fastness of the polyester microfiber base fabric reaches level 3 or above.