Production process of low-color-migration polyester water-based microfiber suede leather

Abstract

The invention belongs to the technical field of manufacturing of microfiber suede leather, and relates to a production process of low-color-migration polyester water-based microfiber suede leather, which comprises the following steps: firstly, preparing polyester water-based microfiber suede leather by adopting a temperature-controlled hydrophobic polyurethane impregnated material, and controlling the impregnation temperature at 20-30 DEG C; then dyeing the polyester water-based microfiber suede leather with a disperse dye at 120-140 DEG C, and carrying out reduction cleaning at 80-90 DEG C after dyeing; and finally, carrying out odor-resistant and antibacterial finishing on the dyed and reductively cleaned polyester water-based microfiber suede leather, and controlling the temperature of the finishing liquid to be 20-30 DEG C to prepare the low-color-migration polyester water-based microfiber suede leather. The temperature-control hydrophobic polyurethane impregnated material comprises polyurethane slurry and PNIPAM resin, and the polyurethane slurry is an aqueous solution of waterborne polyurethane resin. According to the process, the dye liquor is effectively prevented from entering the polyurethane, the dyeing condition of the polyurethane is remarkably reduced, and color migration is not prone to occurring.

Description

Technical Field

[0001] This invention belongs to the field of microfiber suede manufacturing technology, and relates to a production process for low-color-migration polyester water-based microfiber suede. Background Technology

[0002] Microfiber suede, as an important branch of microfiber synthetic leather, possesses excellent physical properties and good breathability, and is widely used in sofa leather, automotive interiors, bags, shoe leather, and clothing. It consists of a microfiber skeleton structure filled with porous polyurethane resin, giving it properties closer to genuine leather. However, some problems still exist with current polyester water-based microfiber suede on the market, especially during the dyeing process. Traditional polyester water-based microfiber suede is prone to color migration during use, affecting the user experience.

[0003] Polyester water-based microfiber suede is mainly composed of polyester and polyurethane. Polyester and polyurethane have different material properties. During the dyeing process, disperse dyes simultaneously color the polyurethane. Due to the poor compatibility between the disperse dyes and polyurethane in terms of molecular structure, the suede is prone to fading during subsequent use, leading to color migration issues.

[0004] Although methods such as reduction cleaning exist to address color migration, removing adsorbed dyes from waterborne polyurethane is difficult, requiring multiple reduction cleaning cycles, significantly increasing costs and reducing production efficiency. For example, CN108360187A relates to a dyeing method for polyester microfiber synthetic leather. The method involves squeezing the dyed microfiber synthetic leather base fabric and then soaping it 1-2 times at a liquor ratio of 1:12-1:20 and a temperature of 70-80℃ for 20-30 minutes each time. Then, it is washed 1-2 times with water at a liquor ratio of 1:12-1:20 and a temperature of 70-80℃ for 20-30 minutes each time. Finally, it is washed 1-2 times with water at a liquor ratio of 1:12-1:20 and a temperature of 30-40℃ for 20-30 minutes each time, followed by a selective color-fixing process.

[0005] Therefore, it is of great significance to study a production process for low-color-migration polyester water-based microfiber suede to solve the problems existing in the current technology. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art and provide a production process for low color migration polyester water-based microfiber suede.

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

[0008] A production process for low-color-migration polyester waterborne microfiber suede involves first preparing the polyester waterborne microfiber suede using a temperature-controlled hydrophobic polyurethane impregnating material. The impregnation temperature is controlled at 20-30℃. During this stage, the waterborne polyurethane impregnating material is kept in a hydrophilic state; excessively high temperatures would cause PNIPAM to transform into a hydrophobic state and precipitate from the impregnation solution. Next, the polyester waterborne microfiber suede is dyed with disperse dyes at 120-140℃. After dyeing, a reduction cleaning is performed at 80-90℃. Too low a reduction cleaning temperature would hinder the removal of dye (floating dye) adhering to the fiber surface. Finally, the dyed and reduced-cleaned polyester waterborne microfiber suede undergoes an anti-odor and antibacterial finishing process, with the finishing solution temperature controlled at 20-30℃, resulting in low-color-migration polyester waterborne microfiber suede. During this stage, the waterborne polyurethane impregnating material is kept in a hydrophilic state.

[0009] The temperature-controlled hydrophobic polyurethane impregnating material comprises polyurethane slurry and PNIPAM resin, wherein the polyurethane slurry is an aqueous solution of water-based polyurethane resin.

[0010] The content of waterborne polyurethane resin in the temperature-controlled hydrophobic polyurethane impregnating material is 20-30 wt%, and the mass ratio of PNIPAM resin to waterborne polyurethane resin is 5:95-30:70. The color migration is grade 2 for both materials without PNIPAM resin and with 4% PNIPAM resin. The color migration of waterborne microfiber suede produced with 5% PNIPAM resin after dyeing and reduction is grade 2.5, and the color migration of waterborne microfiber suede produced with 30% PNIPAM resin after dyeing and reduction is grade 3.5. Further increasing the PNIPAM content does not improve the color migration.

[0011] As a preferred technical solution:

[0012] The production process of a low-color-migration polyester water-based microfiber suede, as described above, involves the preparation of a temperature-controlled hydrophobic polyurethane impregnating material as follows: PNIPAM resin is added to the polyurethane slurry and mixed evenly at 20~30℃ to obtain the temperature-controlled hydrophobic polyurethane impregnating material.

[0013] The production process of the low-color-migration polyester water-based microfiber suede described above uses PNIPAM resin with a number-average molecular weight Mn of 5000~30000.

[0014] The production process of a low-color-migration polyester water-based microfiber suede, as described above, uses a temperature-controlled hydrophobic polyurethane impregnating material to prepare the polyester water-based microfiber suede. The specific process is as follows: polyester microfiber nonwoven fabric is impregnated with the temperature-controlled hydrophobic polyurethane impregnating material at 20~30℃, with a liquid content of 100~150%, and then successively cured, split, and napped to obtain the polyester water-based microfiber suede.

[0015] The production process of the low-color-migration polyester water-based microfiber suede described above uses a polyester microfiber nonwoven fabric with a basis weight of 1150±50 g / m². 2 ;

[0016] The PET component in polyester microfiber accounts for 60-80 wt%, and the COPET (alkali-soluble polyester) component accounts for 20-40 wt%.

[0017] The production process of a low-color-migration polyester water-based microfiber suede, as described above, involves a mass ratio of polyester to water-based polyurethane resin of 6:4 to 8:2.

[0018] The production process of a low-color-migration polyester water-based microfiber suede, as described above, involves a dyeing bath ratio of 1:10~20 and a dyeing time of 15~20 minutes.

[0019] The production process of a low-color-migration polyester water-based microfiber suede, as described above, involves using an acidic reducing cleaning agent for reduction cleaning, which is performed once and takes 30-40 minutes.

[0020] The production process of low-color-migration polyester water-based microfiber suede described above results in a color migration level of 2.5 to 3.5 after one reduction cleaning, with a kill rate of >99% against Klebsiella pneumoniae and >99% against Staphylococcus aureus.

[0021] Invention principle:

[0022] Traditional polyester water-based microfiber suede is prone to color migration during the dyeing process, which affects the user experience. This color migration problem is mainly due to the different material properties of polyester and polyurethane, resulting in the dye's binding fastness in polyurethane being much lower than in polyester.

[0023] When dyeing polyester, disperse dyes are typically used. Disperse dyes exist as a suspension in solution, with a very small amount dissolved in water. When the dye bath temperature rises above the glass transition temperature of polyester, the fiber molecular chains begin to move, creating numerous transient pores on the fiber surface. The dye dissolved in water is adsorbed from the dye bath onto the fiber surface and diffuses into the fiber. As the dyeing process ends and the temperature drops below the glass transition temperature, the polyester molecular chains are "frozen," the fiber structure shrinks, and the diffused dye is completely sealed, resulting in excellent color migration and color fastness. In contrast, waterborne polyurethane, due to its hydrophilicity, swells during the dyeing process, absorbing a significant amount of dye bath. Only a small portion of the dye binds to the polyurethane molecular chains through intermolecular forces, and because the coplanarity of polyurethane molecules is relatively lower than that of polyester molecules, the interaction between polyurethane and disperse dye molecules is also much weaker. More dyes enter the polyurethane interior as suspensions along with the dye solution, without interacting with the polyurethane molecules in any way. They ultimately exist as aggregates in the pores of the polyurethane. This portion of dyes severely affects the color migration and color fastness of polyester water-based microfiber suede.

[0024] Polyurethane dyeing is prone to fading during subsequent use, causing color migration problems in suede. This invention addresses this issue by inhibiting the adsorption of disperse dye suspensions by waterborne polyurethane during the dyeing process, thus preventing color migration in polyester waterborne microfiber suede at its source. As mentioned earlier, due to the hydrophilicity of waterborne polyurethane, it swells during dyeing, absorbing a significant amount of dye solution. Only a small portion of the dye binds to the polyurethane molecular chains through intermolecular forces; the majority of the dye enters the polyurethane interior as a suspension, without interacting with the polyurethane molecules, ultimately existing as aggregates in the polyurethane pores. Therefore, the hydrophilic and hydrophobic properties of waterborne polyurethane affect the ability of disperse dyes to penetrate the polyurethane interior. Further optimization of the hydrophilic and hydrophobic properties of polyurethane is needed to weaken the absorption capacity of waterborne polyurethane for dye solution, ultimately reducing the amount of disperse dye entering the waterborne polyurethane.

[0025] This invention regulates the hydrophilic and hydrophobic properties of polyurethane. During dyeing, hydrophobicity of the PU is desirable to prevent dyes from entering the PU and reduce the absorption capacity of the waterborne polyurethane by the dye solution. However, choosing a hydrophobically modified PU would affect subsequent functional finishing processes (such as antibacterial and deodorizing finishing). Therefore, this invention introduces poly(N-isopropylacrylamide) (PNIPAM) into the polyurethane. The PNIPAM polymer chain simultaneously possesses hydrophilic amide groups (-CONH-) and hydrophobic isopropyl groups (-CH(CH3)2). The competition between these two groups determines the overall hydrophilic / hydrophobic state of the polymer. At low temperatures, hydrogen bonding between the polymer chain and water molecules dominates. Water molecules tightly bind around the amide groups, while the polymer chain itself adopts an extended conformation to maximize contact with water. As the temperature rises, molecular thermal motion intensifies, disrupting the fragile hydrogen bonds between the polymer chain and water molecules. Simultaneously, the interaction between the hydrophobic groups (isopropyl groups) (hydrophobic interaction) significantly increases, becoming the dominant force. To reduce contact with water, the polymer chain collapses and aggregates. The inventors utilized the relationship between the hydrophilicity / hydrophobicity of such substances and temperature to control the dyeing temperature to a suitable hydrophobic state in PU, and to select a suitable hydrophilic state in PU at the antibacterial and deodorizing finishing temperature, thus solving the aforementioned problems.

[0026] Microfiber suede was prepared using a temperature-controlled waterborne polyurethane impregnating agent, with precise control over both dyeing and finishing temperatures. During high-temperature dyeing, the hydrophobic nature of the waterborne polyurethane reduced its adsorption of the dye liquor, minimizing the entry of disperse dye suspensions into the polyurethane. This method significantly reduced the adsorption of disperse dyes in the polyurethane, improving dye stability in the suede and overcoming the color migration issue common in traditional microfiber suede during dyeing. The antibacterial and deodorizing finishing process involved padding with an antibacterial agent at 20-30°C. At this temperature, the waterborne polyurethane was hydrophilic, allowing it to absorb the antibacterial finishing solution effectively, thus resolving the aforementioned problems.

[0027] Beneficial effects:

[0028] (1) The production process of low-color migration polyester waterborne microfiber suede of the present invention introduces poly N-isopropylacrylamide (PNIPAM) into polyurethane impregnation material and controls the dyeing temperature and finishing temperature, which effectively prevents the dye liquor from entering the polyurethane and significantly reduces the dyeing condition of polyurethane; at the same time, it reduces the number of reduction cleaning times of traditional microfiber suede, improves production efficiency and reduces energy consumption.

[0029] (2) The production process of a low-color migration polyester water-based microfiber suede of the present invention, in the antibacterial and deodorizing process, by controlling the temperature of the finishing liquid at 20~30℃, PNIPAM is made to be in a hydrophilic state, which does not affect the antibacterial and deodorizing finishing effect.

[0030] (3) The production process of a low-color-migration polyester water-based microfiber suede of the present invention is simple and feasible, easy to operate, easy to industrialize, and does not require the use of harmful substances, which meets the environmental protection requirements. Detailed Implementation

[0031] 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.

[0032] The test methods involved in the performance indicators in the embodiments and comparative examples of this invention are as follows:

[0033] Color migration: The color migration effect was determined according to ISO 15701, and the test results were rated according to the GB / T 251-2008 standard color card.

[0034] Contact angle: The thixotropic temperature of the PNIPAM used in this embodiment of the invention is around 32°C (measured by DSC). Therefore, temperature points below 32°C and above 32°C were selected to evaluate the contact angle of the material. The contact angle of water at room temperature of 25°C and water at 50°C on the resin film was measured using an SDC-200S scientific contact angle measuring instrument. The specific process of resin film preparation is as follows: a temperature-controlled hydrophobic polyurethane impregnating material is coated on the surface of a PTEE board with a coating thickness of 2mm, and then dried at 120°C to form a resin film.

[0035] Antibacterial properties: Tested according to ASTM E 2149-13a, test bacteria: Klebsiella pneumoniae ATCC 4352, Staphylococcus aureus ATCC 6538. Optimal antibacterial treatment effect is achieved when the contact angle is ≤55°.

[0036] The sources of some of the materials in this invention are as follows:

[0037] Polyurethane slurry: AH-1704-3 waterborne polyurethane resin, purchased from Anhui Anda Huatai New Materials Co., Ltd.

[0038] Nonwoven fabric: Produced by Huafeng Microfiber, brand name C1QW0680-DE00B.

[0039] Disperse Yellow AM-2R, Disperse Red AM-SLR, and Disperse Blue AM-SLR dyes: purchased from Shanghai Shuangkang Industrial Co., Ltd.

[0040] Dyeing auxiliaries: dispersant M-IS and leveling agent P-BM, purchased from Shanghai Shuangkang Industrial Co., Ltd.

[0041] Acidic reducing cleaning agent: DY-TX acidic reducing cleaning agent, purchased from Qingdao Dayin Chemical Co., Ltd.

[0042] Antibacterial and deodorizing finishing agent: HeiQ Pure TAG, Swiss brand.

[0043] To facilitate comparative testing, a uniform anti-odor and antibacterial padding treatment was performed in the examples, with a finishing solution concentration of 1 wt% and a liquid carry-over rate of 45%, but the specific post-finishing process was not limited.

[0044] Example 1

[0045] A production process for low-color-migration polyester water-based microfiber suede, the specific steps of which are as follows:

[0046] (1) Preparation of temperature-controlled hydrophobic polyurethane impregnating material:

[0047] PNIPAM resin with a number average molecular weight Mn of 5000 was added to an aqueous solution of waterborne polyurethane resin and mixed evenly at 20°C to obtain a temperature-controlled hydrophobic polyurethane impregnating material.

[0048] The content of waterborne polyurethane resin in the temperature-controlled hydrophobic polyurethane impregnating material is 20wt%, and the mass ratio of PNIPAM resin to waterborne polyurethane resin is 5:95.

[0049] The contact angle of water at 25°C on the resin membrane is 50°, and the contact angle of water at 50°C on the resin membrane is 62°.

[0050] (2) Preparation of polyester water-based microfiber suede using temperature-controlled hydrophobic polyurethane impregnating material:

[0051] The weight is 1100g / m 2 Polyester microfiber nonwoven fabric is impregnated with temperature-controlled hydrophobic polyurethane impregnating material at 20°C with a liquid content of 100%. It is then subjected to curing, alkali reduction fiber opening, and napping to obtain polyester water-based microfiber suede.

[0052] Among them, the PET component in polyester microfiber accounts for 60wt%, and the COPET component accounts for 40wt%; the mass ratio of polyester to waterborne polyurethane resin in polyester waterborne microfiber suede is 6:4; the concentration of NaOH solution used in alkali reduction fiber opening is 2g / L, the alkali reduction bath ratio is 1:20, the alkali reduction temperature is 80℃, and the alkali reduction time is 30min.

[0053] (3) At a liquor ratio of 1:10, polyester water-based microfiber suede was dyed with disperse dye at 140℃ for 15 min. After dyeing, it was reduced and cleaned at 90℃ with acidic reducing cleaning agent DY-TX for 30 min.

[0054] The dyeing process used 1% owf of Disperse Yellow AM-2R, 1% owf of Disperse Red AM-SLR, 1% owf of Disperse Blue AM-SLR, 0.5% owf of Dispersant M-IS and 1% owf of Leveling Agent P-BMO; the acid reducing cleaning agent DY-TX was used at a dosage of 5 g / L.

[0055] (4) The polyester water-based microfiber suede that has been dyed and reduced and cleaned is subjected to deodorizing and antibacterial finishing. The temperature of the finishing solution is controlled at 20°C to obtain polyester water-based microfiber suede with low color migration.

[0056] The resulting low-color-migration polyester water-based microfiber suede had a color migration grade of 2.5 after one reduction wash, and exhibited a kill rate of >99% against Klebsiella pneumoniae ATCC 4352 and >99% against Staphylococcus aureus ATCC6538.

[0057] Comparative Example 1

[0058] A polyester water-based microfiber suede is basically the same as in Example 1, except that the addition of PNIPAM resin is omitted in step (1).

[0059] The contact angle of water at 25°C on the resin membrane is 55°, and the contact angle of water at 50°C on the resin membrane is also 55°.

[0060] The final polyester water-based microfiber suede had a color migration grade of 2, and a kill rate of >99% against Klebsiella pneumoniae ATCC 4352 and Staphylococcus aureus ATCC 6538.

[0061] Comparing Comparative Example 1 and Example 1, it can be found that the color migration level of Comparative Example 1 is reduced. This is because Comparative Example 1 did not add PNIPAM resin, and therefore did not undergo either hydrophilic or hydrophobic modification.

[0062] Example 2

[0063] A production process for low-color-migration polyester water-based microfiber suede, the specific steps of which are as follows:

[0064] (1) Preparation of temperature-controlled hydrophobic polyurethane impregnating material:

[0065] PNIPAM resin with a number average molecular weight Mn of 10000 was added to an aqueous solution of waterborne polyurethane resin and mixed evenly at 25°C to obtain a temperature-controlled hydrophobic polyurethane impregnating material.

[0066] The content of waterborne polyurethane resin in the temperature-controlled hydrophobic polyurethane impregnating material is 22wt%, and the mass ratio of PNIPAM resin to waterborne polyurethane resin is 10:90.

[0067] The contact angle of water on the resin membrane at 25°C is 47°, and the contact angle of water on the resin membrane at 50°C is 71°.

[0068] (2) Preparation of polyester water-based microfiber suede using temperature-controlled hydrophobic polyurethane impregnating material:

[0069] The weight is 1125g / m 2 Polyester microfiber nonwoven fabric is impregnated with temperature-controlled hydrophobic polyurethane impregnating material at 25°C with a liquid content of 110%. It is then subjected to curing, alkali reduction fiber opening, and napping to obtain polyester water-based microfiber suede.

[0070] Among them, the PET component accounts for 65wt% and the COPET component accounts for 35wt% in the polyester microfiber; the mass ratio of polyester to waterborne polyurethane resin in the polyester waterborne microfiber suede is 7:3; the concentration of NaOH solution used in the alkali reduction fiber opening is 2g / L, the alkali reduction bath ratio is 1:20, the alkali reduction temperature is 80℃, and the alkali reduction time is 32min.

[0071] (3) At a liquor ratio of 1:12, polyester water-based microfiber suede was dyed with disperse dye at 135℃ for 16 min. After dyeing, it was reduced and cleaned at 88℃ with acidic reducing cleaning agent DY-TX for 35 min.

[0072] The dyeing process used 1% owf of Disperse Yellow AM-2R, 1% owf of Disperse Red AM-SLR, 1% owf of Disperse Blue AM-SLR, 0.5% owf of Dispersant M-IS and 1% owf of Leveling Agent P-BMO; the acid reducing cleaning agent DY-TX was used at a dosage of 5 g / L.

[0073] (4) The polyester water-based microfiber suede that has been dyed and reduced and cleaned is subjected to deodorizing and antibacterial finishing. The temperature of the finishing solution is controlled at 23°C to obtain polyester water-based microfiber suede with low color migration.

[0074] The resulting low-color-migration polyester water-based microfiber suede had a color migration level of 3 after one reduction wash, and exhibited a kill rate of >99% against Klebsiella pneumoniae ATCC 4352 and >99% against Staphylococcus aureus ATCC6538.

[0075] Example 3

[0076] A production process for low-color-migration polyester water-based microfiber suede, the specific steps of which are as follows:

[0077] (1) Preparation of temperature-controlled hydrophobic polyurethane impregnating material:

[0078] PNIPAM resin with a number average molecular weight Mn of 20000 was added to an aqueous solution of waterborne polyurethane resin and mixed evenly at 30°C to obtain a temperature-controlled hydrophobic polyurethane impregnating material.

[0079] The content of waterborne polyurethane resin in the temperature-controlled hydrophobic polyurethane impregnating material is 25wt%, and the mass ratio of PNIPAM resin to waterborne polyurethane resin is 15:85.

[0080] The contact angle of water at 25°C on the resin membrane is 43°, and the contact angle of water at 50°C on the resin membrane is 83°.

[0081] (2) Preparation of polyester water-based microfiber suede using temperature-controlled hydrophobic polyurethane impregnating material:

[0082] The weight is 1150g / m 2 Polyester microfiber nonwoven fabric is impregnated with temperature-controlled hydrophobic polyurethane impregnating material at 30°C with a liquid content of 120%. It is then subjected to curing, alkali reduction fiber opening, and napping to obtain polyester water-based microfiber suede.

[0083] Among them, the PET component accounts for 70wt% and the COPET component accounts for 30wt% in the polyester microfiber; the mass ratio of polyester to waterborne polyurethane resin in the polyester waterborne microfiber suede is 8:2; the concentration of NaOH solution used in the alkali reduction fiber opening is 2g / L, the alkali reduction bath ratio is 1:20, the alkali reduction temperature is 80℃, and the alkali reduction time is 35min.

[0084] (3) At a liquor ratio of 1:15, polyester water-based microfiber suede was dyed with disperse dye at 125℃ for 17 min. After dyeing, it was reduced and cleaned at 85℃ with acidic reducing cleaning agent DY-TX for 40 min.

[0085] The dyeing process used 1% owf of Disperse Yellow AM-2R, 1% owf of Disperse Red AM-SLR, 1% owf of Disperse Blue AM-SLR, 0.5% owf of Dispersant M-IS and 1% owf of Leveling Agent P-BMO; the acid reducing cleaning agent DY-TX was used at a dosage of 5 g / L.

[0086] (4) The polyester water-based microfiber suede that has been dyed and reduced and cleaned is subjected to deodorizing and antibacterial finishing. The temperature of the finishing solution is controlled at 30℃ to obtain polyester water-based microfiber suede with low color migration.

[0087] The resulting low-color-migration polyester water-based microfiber suede had a color migration level of 3 after one reduction wash, and exhibited a kill rate of >99% against Klebsiella pneumoniae ATCC 4352 and >99% against Staphylococcus aureus ATCC6538.

[0088] Example 4

[0089] A production process for low-color-migration polyester water-based microfiber suede, the specific steps of which are as follows:

[0090] (1) Preparation of temperature-controlled hydrophobic polyurethane impregnating material:

[0091] PNIPAM resin with a number average molecular weight Mn of 30000 was added to an aqueous solution of waterborne polyurethane resin and mixed evenly at 28°C to obtain a temperature-controlled hydrophobic polyurethane impregnating material.

[0092] The content of waterborne polyurethane resin in the temperature-controlled hydrophobic polyurethane impregnating material is 30wt%, and the mass ratio of PNIPAM resin to waterborne polyurethane resin is 30:70.

[0093] The contact angle of water at 25°C on the resin membrane is 38°, and the contact angle of water at 50°C on the resin membrane is 100°.

[0094] (2) Preparation of polyester water-based microfiber suede using temperature-controlled hydrophobic polyurethane impregnating material:

[0095] The weight is 1200g / m 2 Polyester microfiber nonwoven fabric is impregnated with temperature-controlled hydrophobic polyurethane impregnating material at 28°C with a liquid content of 150%. It is then subjected to curing, alkali reduction fiber opening, and napping to obtain polyester water-based microfiber suede.

[0096] Among them, the PET component accounts for 80wt% and the COPET component accounts for 20wt% in the polyester microfiber; the mass ratio of polyester to waterborne polyurethane resin in the polyester waterborne microfiber suede is 8:2; the concentration of NaOH solution used in the alkali reduction fiber opening is 2g / L, the alkali reduction bath ratio is 1:20, the alkali reduction temperature is 80℃, and the alkali reduction time is 40min.

[0097] (3) At a liquor ratio of 1:20, polyester water-based microfiber suede was dyed with disperse dye at 120℃ for 20 min. After dyeing, it was reduced and cleaned at 80℃ with acidic reducing cleaning agent DY-TX for 35 min.

[0098] The dyeing process used 1% owf of Disperse Yellow AM-2R, 1% owf of Disperse Red AM-SLR, 1% owf of Disperse Blue AM-SLR, 0.5% owf of Dispersant M-IS and 1% owf of Leveling Agent P-BMO; the acid reducing cleaning agent DY-TX was used at a dosage of 5 g / L.

[0099] (4) The polyester water-based microfiber suede that has been dyed and reduced and cleaned is subjected to deodorizing and antibacterial finishing. The temperature of the finishing solution is controlled at 28℃ to obtain polyester water-based microfiber suede with low color migration.

[0100] The resulting low-color-migration polyester water-based microfiber suede had a color migration grade of 3.5 after one reduction wash, and exhibited a kill rate of >99% against Klebsiella pneumoniae ATCC 4352 and >99% against Staphylococcus aureus ATCC6538.

[0101] Comparative Example 2

[0102] A polyester water-based microfiber suede, basically the same as in Example 4, except that in step (1), the mixture is uniformly mixed at 50°C;

[0103] The contact angle of water on the resin membrane at 25°C is 46°, and the contact angle of water on the resin membrane at 50°C is 82°.

[0104] The final polyester water-based microfiber suede had a color migration grade of 2, and a kill rate of >99% against Klebsiella pneumoniae ATCC 4352 and Staphylococcus aureus ATCC 6538.

[0105] Comparing Comparative Example 2 and Example 4, it can be found that the color migration rate of Comparative Example 2 decreased. This is because the mixing temperature of Comparative Example 2 was too high, which caused PNIPAM to precipitate and disperse in the impregnating material in the form of suspended particles. As a result, the distribution in the final product was uneven. Although it still has the properties of being hydrophilic at low temperature and hydrophobic at high temperature, its contribution to improving color migration fastness was greatly reduced.

[0106] Comparative Example 3

[0107] A polyester water-based microfiber suede is basically the same as in Example 4, except that the temperature of the finishing solution in step (4) is 50°C.

[0108] The final low-color-migration polyester waterborne microfiber suede had a color migration grade of 3.5, a kill rate of 95.5% (<99%) against Klebsiella pneumoniae ATCC 4352, and a kill rate of 96.2% (<99%) against Staphylococcus aureus ATCC6538.

[0109] Comparing Comparative Example 3 and Example 4, it can be found that the antibacterial properties of Comparative Example 3 decreased. This is because the temperature of the finishing solution in Comparative Example 3 was too high, resulting in insufficient hydrophilicity and thus poor antibacterial and deodorizing finishing effect.

Claims

1. A production process of low color migration polyester water-based microfiber suede leather, characterized by: The polyester water-based microfiber suede is prepared by using the temperature-controllable hydrophobic polyurethane impregnating agent, the impregnating temperature is controlled at 20-30 DEG C, then the polyester water-based microfiber suede is dyed by using disperse dyes at 120-140 DEG C, and then the polyester water-based microfiber suede is subjected to reduction cleaning at 80-90 DEG C, and finally the polyester water-based microfiber suede is subjected to deodorization and antibacterial finishing, the temperature of the finishing solution is controlled at 20-30 DEG C, thereby the polyester water-based microfiber suede with low color migration is prepared; The temperature-controllable hydrophobic polyurethane impregnating agent comprises a polyurethane slurry and a PNIPAM resin, and the polyurethane slurry is an aqueous solution of a water-based polyurethane resin; The content of the water-based polyurethane resin in the temperature-controllable hydrophobic polyurethane impregnating agent is 20-30 wt%, and the mass ratio of the PNIPAM resin to the water-based polyurethane resin is 5:95-30:

70.

2. The production process of low color transfer polyester water-based microfiber suede leather according to claim 1, characterized in that, The preparation process of the temperature-controllable hydrophobic polyurethane impregnating agent is as follows: the PNIPAM resin is added into the polyurethane slurry, and then the mixture is uniformly mixed at 20-30 DEG C to obtain the temperature-controllable hydrophobic polyurethane impregnating agent.

3. The production process of low color transfer polyester water-based microfiber suede leather according to claim 2, characterized in that, The number average molecular weight Mn of the PNIPAM resin is 5000-30000.

4. The production process of low color transfer polyester water-based microfiber suede leather according to claim 1, characterized in that, The polyester water-based microfiber suede is prepared by using the temperature-controllable hydrophobic polyurethane impregnating agent, the polyester microfiber non-woven fabric is impregnated with the temperature-controllable hydrophobic polyurethane impregnating agent at 20-30 DEG C, the liquid retention rate is 100-150%, and then the polyester water-based microfiber suede is obtained by sequentially performing curing, opening and raising.

5. The production process of low color transfer polyester water-based microfiber suede leather according to claim 4, characterized in that, The grammage of the polyester ultrafine fiber nonwoven fabric is 1150±50 g / m 2 ; The content of the PET component in the polyester microfiber is 60-80 wt%, and the content of the COPET component is 20-40 wt%.

6. The production process of low color transfer polyester water-based microfiber suede leather according to claim 1, characterized in that, The mass ratio of the polyester to the water-based polyurethane resin in the polyester water-based microfiber suede is 6:4-8:

2.

7. The production process of low color transfer polyester water-based microfiber suede leather according to claim 1, characterized in that, The bath ratio of the dyeing is 1:10-20, and the dyeing time is 15-20 min.

8. The production process of low color transfer polyester water-based microfiber suede leather according to claim 1, characterized in that, The reduction cleaning is performed by using an acidic reduction cleaning agent, the reduction cleaning is performed once, and the reduction cleaning time is 30-40 min.