Soft absorbent polyester fabric and method of making same

Abstract

The application relates to the technical field of fabrics, and discloses a soft and moisture-absorbing polyester fabric and a preparation method thereof. An organic silicon finishing agent is added into water, stirred to obtain a finishing agent solution, then a polyester fabric is subjected to two-dip-two-roll, pre-drying, baking, washing, soaping, and drying to obtain the soft and moisture-absorbing polyester fabric. The organic silicon finishing agent contains flexible polysiloxane molecular chains, and can improve the softness and wrinkle resistance of the polyester fabric after finishing. Moreover, the organic silicon finishing agent contains a large number of hydrophilic hydroxyl groups and carboxyl groups, can improve the moisture regain of the polyester, and is beneficial to improving the moisture absorption and moisture permeability of the polyester. The finishing agent is tightly and firmly attached to the surface of the polyester fabric, and the polyester fabric still has good softness, wrinkle resistance and moisture regain after washing, so that the application range of the polyester fabric is widened, and the polyester fabric can be used for manufacturing clothes.

Description

Technical Field

[0001] This invention relates to the field of fabric technology, specifically to a soft, moisture-wicking polyester fabric and its preparation method. Background Technology

[0002] Finishing agents are common textile auxiliaries that impart properties such as softness, wrinkle resistance, hydrophilicity, and antistatic properties to fabrics. Common finishing agents include polyester finishing agents, silicone finishing agents, and polyurethane finishing agents. Among them, silicone finishing agents can significantly improve the hand feel, flame retardancy, and stain resistance of fabrics, and are widely used in polyester, nylon, and cotton fabrics.

[0003] Polyester fabrics have low hydrophobicity, resulting in low moisture regain and breathability. Furthermore, traditional silicone finishing agents have significant hydrophobicity, which further reduces the moisture regain and hydrophilicity of polyester fabrics after finishing, affecting their moisture absorption and breathability. Patent CN112921647B discloses an anti-drip finishing method for polyester, using aminosilane, p-hydroxybenzaldehyde, phytic acid, and other raw materials to prepare a finishing agent that can achieve flame-retardant finishing of polyester. However, this finishing agent does not improve the moisture regain of polyester, thus failing to improve its moisture absorption and breathability. Summary of the Invention

[0004] The technical problem solved by this invention is to address the issues of poor wrinkle resistance, softness, and moisture absorption properties in polyester fabrics.

[0005] The technical solution of this invention is: a method for preparing a soft and moisture-absorbing polyester fabric.

[0006] (1) Add diaminopropyl polydimethylsiloxane and 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine to ethanol, stir and react, cool, filter, wash the precipitate with ethanol, and dry to obtain the finishing agent precursor.

[0007] (2) Add the finishing agent precursor, succinic anhydride, and 4-dimethylaminopyridine to N,N-dimethylformamide. After stirring and reacting, pour the solution into ethanol, filter, wash the precipitate with ethanol, and dry to obtain the organosilicon finishing agent. The reaction formula is:

[0008]

[0009] (3) Add organosilicon finishing agent to water, stir to obtain finishing agent solution, and then perform two dips and two nips, pre-drying, baking, water washing, soap washing and drying on polyester fabric to obtain soft and moisture-absorbing polyester fabric.

[0010] Preferably, in (1), the mass ratio of diaminopropyl polydimethylsiloxane and 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine is 100:(10-14).

[0011] Preferably, the reaction temperature in (1) is 50-70℃ and the reaction time is 7-12h.

[0012] Preferably, in (2), the mass ratio of finishing agent precursor, succinic anhydride and 4-dimethylaminopyridine is 100:(4-14):(2.6-9).

[0013] Preferably, the reaction temperature in (2) is 20-35℃ and the reaction time is 12-18h.

[0014] Preferably, the concentration of the finishing agent solution in (3) is 20-60 g / L.

[0015] Preferably, in (3), the bath ratio is controlled to be 1:(30-50) during the two dips and two rolls.

[0016] Preferably, in (3), the rolling residue during the two dips and two rolls is 85-90%.

[0017] Preferably, the pre-baking temperature in (3) is 90-100℃ and the time is 2-3 min.

[0018] Preferably, the baking temperature in (3) is 170-180℃ and the baking time is 1.5-2min.

[0019] Preferably, the drying temperature in (3) is 100-130℃ and the drying time is 20-40min.

[0020] (III) Beneficial technical effects: The present invention involves Schiff base polymerization of diaminopropyl polydimethylsiloxane and 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine, and then esterification of some of the hydroxyl groups with succinic anhydride to obtain an organosilicon finishing agent, which is used to finish polyester fabrics. The organosilicon finishing agent contains flexible polysiloxane molecular chains, which can improve the softness and wrinkle resistance of polyester fabrics after finishing.

[0021] The organosilicon finishing agent of the present invention contains a large number of hydrophilic hydroxyl groups, carboxyl groups, etc., which can improve the moisture regain of polyester and improve the moisture absorption and permeability of polyester.

[0022] The silicone finishing agent of the present invention contains ester groups, which have good affinity with the polyester molecular chain of polyester, so that the finishing agent can be tightly and firmly attached to the surface of polyester fabric, making it difficult to wash off. After washing, the polyester fabric still has good softness, wrinkle resistance and moisture regain. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] 1,4-Diformyl-2,3,5,6-Tetrahydroxypiperazine was prepared according to the method described in the journal Synlett 2016; 27(15):2246-2250, entitled "A Convenient Method for the Preparation of 4,10-Dinitro-2,6,8,12-tetraoxa-4,10-diazatetracyclo[5.5.0.05,903,11]dodecane via Nitration of 1,4-Diformyl-2,3,5,6-tetrahydroxypiperazine Using [Msim]NO3". The structural formula is as follows:

[0025] Example 1:

[0026] (1) Add 50g of diaminopropyl polydimethylsiloxane (molecular weight about 2000, the same below) and 5.6g of 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine to 0.8L of ethanol, heat to 50℃, stir and react for 12h, cool and filter, wash the precipitate with ethanol, dry and obtain the finishing agent precursor.

[0027] (2) Add 50g of finishing agent precursor, 2g of succinic anhydride and 1.3g of 4-dimethylaminopyridine to 0.6L N,N-dimethylformamide, stir and react at 25℃ for 12h, pour the solution into ethanol, filter and wash the precipitate with ethanol, dry and obtain organosilicon finishing agent.

[0028] (3) Add organosilicon finishing agent to water, stir to obtain a finishing agent solution with a concentration of 20g / L, and then perform two dips and two nips on the polyester fabric with a bath ratio of 1:40 and a nip rate of 85%. Pre-dry at 100℃ for 2min, bake at 170℃ for 2min, wash with water, soap wash, and dry at 120℃ for 20min to obtain a soft and moisture-absorbing polyester fabric.

[0029] Example 2:

[0030] (1) Add 50g of diaminopropyl polydimethylsiloxane and 7g of 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine to 1L of ethanol, heat to 70℃, stir and reflux for 7h, filter after cooling, wash the precipitate with ethanol, dry and obtain the finishing agent precursor.

[0031] (2) Add 50g of finishing agent precursor, 3.5g of succinic anhydride and 2.4g of 4-dimethylaminopyridine to 0.6L N,N-dimethylformamide, stir and react at 35℃ for 12h, pour the solution into ethanol, filter and wash the precipitate with ethanol, dry and obtain organosilicon finishing agent.

[0032] (3) Add organosilicon finishing agent to water, stir to obtain a finishing agent solution with a concentration of 30g / L, and then perform two dips and two nips on the polyester fabric with a bath ratio of 1:50 and a nip rate of 90%. Pre-dry at 90℃ for 3min, bake at 170℃ for 1.5min, wash with water, soap wash, and dry at 130℃ for 20min to obtain a soft and moisture-absorbing polyester fabric.

[0033] Example 3:

[0034] (1) Add 50g of diaminopropyl polydimethylsiloxane and 5g of 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine to 0.8L of ethanol, heat to 70℃, stir and reflux for 8h, filter after cooling, wash the precipitate with ethanol, dry and obtain the finishing agent precursor.

[0035] (2) Add 50g of finishing agent precursor, 5.2g of succinic anhydride and 3.5g of 4-dimethylaminopyridine to 0.7L N,N-dimethylformamide, stir and react at 20℃ for 18h, pour the solution into ethanol, filter and wash the precipitate with ethanol, dry and obtain organosilicon finishing agent.

[0036] (3) Add organosilicon finishing agent to water and stir to obtain a finishing agent solution with a concentration of 45g / L. Then, dip and rub the polyester fabric twice with a bath ratio of 1:40 and a pick-up rate of 85%. Pre-dry at 90℃ for 3min, bake at 180℃ for 1.5min, wash with water, soap wash, and dry at 100℃ for 40min to obtain a soft and moisture-absorbing polyester fabric.

[0037] Example 4:

[0038] (1) Add 50g of diaminopropyl polydimethylsiloxane and 6.2g of 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine to 1L of ethanol, heat to 60℃, stir and reflux for 12h, filter after cooling, wash the precipitate with ethanol, dry and obtain the finishing agent precursor.

[0039] (2) Add 50g of finishing agent precursor, 7g of succinic anhydride and 4.5g of 4-dimethylaminopyridine to 0.7L N,N-dimethylformamide, stir and react at 25℃ for 18h, pour the solution into ethanol, filter and wash the precipitate with ethanol, dry and obtain organosilicon finishing agent.

[0040] (3) Add organosilicon finishing agent to water and stir to obtain a finishing agent solution with a concentration of 60g / L. Then, dip and rub the polyester fabric twice with a bath ratio of 1:40 and a roll-off rate of 90%. Pre-dry at 90℃ for 3min, bake at 180℃ for 1.5min, wash with water, soap wash, and dry at 130℃ for 20min to obtain a soft and moisture-absorbing polyester fabric.

[0041] Comparative Example 1 differs from Example 1 in that it uses diaminopropyl polydimethylsiloxane instead of the organosilicon finishing agent.

[0042] (1) Add diaminopropyl polydimethylsiloxane to water and stir to obtain a finishing agent solution with a concentration of 20 g / L. Then, dip and nibble the polyester fabric twice with a bath ratio of 1:40 and a pick-up rate of 85%. Pre-dry at 100°C for 2 min, bake at 170°C for 2 min, wash with water, soap wash, and dry at 120°C for 20 min to obtain a soft and moisture-absorbing polyester fabric.

[0043] Comparative Example 2 differs from Example 1 in that a finishing agent precursor is used instead of an organosilicon finishing agent.

[0044] (1) Add the finishing agent precursor to the water and stir to obtain a finishing agent solution with a concentration of 20 g / L. Then, the polyester fabric is subjected to two dips and two nips with a bath ratio of 1:40 and a nip rate of 85%. The fabric is pre-dried at 100℃ for 2 min, baked at 170℃ for 2 min, washed with water, soaped, and dried at 120℃ for 20 min to obtain a soft and moisture-absorbing polyester fabric.

[0045] Comparative Example 3 differs from Example 1 in that glutaraldehyde is used instead of the organosilicon finishing agent.

[0046] (1) Add 50g of diaminopropyl polydimethylsiloxane and 5.6g of glutaraldehyde to 0.8L of ethanol, heat to 50℃, stir and react for 12h, cool and filter, wash the precipitate with ethanol, dry and obtain the finishing agent precursor.

[0047] (2) Add 50g of finishing agent precursor, 2g of succinic anhydride and 1.3g of 4-dimethylaminopyridine to 0.6L N,N-dimethylformamide, stir at 25℃ for 12h, pour the solution into ethanol, filter, wash the precipitate with ethanol, dry and obtain organosilicon finishing agent.

[0048] (3) Add organosilicon finishing agent to water, stir to obtain a finishing agent solution with a concentration of 20g / L, and then perform two dips and two nips on the polyester fabric with a bath ratio of 1:40 and a nip rate of 85%. Pre-dry at 100℃ for 2min, bake at 170℃ for 2min, wash with water, soap wash, and dry at 120℃ for 20min to obtain a soft and moisture-absorbing polyester fabric.

[0049] The wrinkle recovery angle of polyester fabrics is tested according to GB / T 3819-1997 standard.

[0050] The moisture regain of polyester fabrics was tested according to GB / T 9994-2018 standard.

[0051] Wash polyester fabrics 30 times according to GB / T 8629-2017 standard, and then test the wrinkle recovery angle and moisture regain.

[0052] Table 1 Properties of polyester fabrics

[0053]

[0054] The polyester fabrics in Examples 1-4, after being treated with silicone finishing agents, exhibit higher wrinkle recovery angles, improved wrinkle resistance and softness, increased moisture regain, and better hydrophilicity. Furthermore, they maintain high wrinkle recovery angles and moisture regain even after washing, demonstrating excellent washability. This is primarily because the silicone finishing agents contain flexible polysiloxane molecular chains, which enhance the softness and wrinkle resistance of the polyester fabrics. They also contain a large number of hydrophilic hydroxyl and carboxyl groups, further increasing the moisture regain and hydrophilicity of the polyester. Additionally, the silicone finishing agents contain ester groups, which have good affinity with the polyester molecular chains, allowing the finishing agent to adhere tightly and firmly to the surface of the polyester fabric, making it difficult to wash off.

[0055] Comparative Example 1 used diaminopropyl polydimethylsiloxane as a finishing agent. Its poor hydrophilicity resulted in low moisture regain of the polyester fabric. Furthermore, lacking ester groups, it had low affinity for polyester, making it prone to detachment after washing, leading to a significant decrease in the wrinkle recovery angle. The increased moisture regain after washing was mainly due to the removal of the highly hydrophobic polydimethylsiloxane, reducing the hydrophobicity of the polyester fabric.

[0056] The finishing agent precursor in Comparative Example 2 does not contain ester groups and has low affinity for polyester. After washing, the finishing agent is easily detached, resulting in a significant decrease in wrinkle recovery angle and moisture regain.

[0057] Comparative Example 3 involved polymerizing diaminopropyl polydimethylsiloxane and glutaraldehyde. The resulting finishing agent precursor lacked hydroxyl groups and could not undergo esterification with succinic anhydride. The resulting silicone finishing agent contained neither hydroxyl nor carboxyl hydrophilic groups, resulting in lower moisture regain in the polyester fabric. Furthermore, the finishing agent lacked ester groups, leading to lower affinity with polyester. After washing, the finishing agent easily detached, resulting in a significant decrease in the wrinkle recovery angle. The moisture regain after washing tended to increase, mainly because the strongly hydrophobic polydimethylsiloxane finishing agent was washed away, reducing the hydrophobicity of the polyester fabric.

[0058] 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 preparing a soft, moisture-absorbing polyester fabric, characterized in that, The preparation method includes the following steps: adding an organosilicon finishing agent to water, stirring to obtain a finishing agent solution with a concentration of 20-60 g / L, then subjecting the polyester fabric to two dips and two nips, controlling the bath ratio to 1:(30-50), the nips rate to 85-90%, pre-drying, baking, washing, soaping, and drying to obtain a soft and moisture-absorbing polyester fabric. The preparation method of the organosilicon finishing agent includes the following steps: (1) Add diaminopropyl polydimethylsiloxane and 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine to ethanol, stir and react, cool, filter, wash the precipitate, dry, and obtain the finishing agent precursor. (2) Add finishing agent precursor, succinic anhydride and 4-dimethylaminopyridine to N,N-dimethylformamide, stir the reaction and pour the solution into ethanol, filter, wash the precipitate and dry to obtain organosilicon finishing agent.

2. The method for preparing the soft, moisture-absorbing polyester fabric according to claim 1, characterized in that, The pre-baking temperature is 90-100℃ and the time is 2-3 minutes.

3. The method for preparing the soft, moisture-absorbing polyester fabric according to claim 1, characterized in that, The baking temperature is 170-180℃ and the time is 1.5-2 minutes.

4. The method for preparing the soft, moisture-absorbing polyester fabric according to claim 1, characterized in that, The drying temperature is 100-130℃ and the time is 20-40 minutes.

5. The method for preparing the soft, moisture-absorbing polyester fabric according to claim 1, characterized in that, The mass ratio of diaminopropyl polydimethylsiloxane and 1,4-dicarboxyloyl 2,3,5,6-tetrahydroxypiperazine in (1) is 100:(10-14).

6. The method for preparing the soft, moisture-absorbing polyester fabric according to claim 1, characterized in that, The reaction temperature in (1) is 50-70℃ and the reaction time is 7-12h.

7. The method for preparing the soft, moisture-absorbing polyester fabric according to claim 1, characterized in that, In step (2), the mass ratio of the finishing agent precursor, succinic anhydride, and 4-dimethylaminopyridine is 100:(4-14):(2.6-9).

8. The method for preparing the soft, moisture-absorbing polyester fabric according to claim 1, characterized in that, The reaction temperature in (2) is 20-35℃ and the reaction time is 12-18h.

9. A soft, moisture-wicking polyester fabric obtained by the preparation method according to any one of claims 1-8.

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