Wear-resistant and anti-pilling composite fabric and preparation method thereof

Abstract

The invention relates to the technical field of fabrics, and discloses a wear-resistant and anti-pilling composite fabric and a preparation method thereof.The wear-resistant and anti-pilling composite fabric is prepared by adding a betaine aromatic polyamide finishing agent and an emulsifier into water, stirring, adding a cotton fabric composite fabric for finishing, dipping and rolling twice, pre-drying and baking, and obtaining the wear-resistant and anti-pilling composite fabric. The side chain of betaine aromatic polyamide contains active hydroxyl, the active hydroxyl and hydroxyl on the surface of the cotton fabric are subjected to hydrogen bond and other interaction, the binding force between betaine aromatic polyamide and hydroxyl is improved, the aromatic polyamide finishing agent is more firmly attached to the surface of the fabric and is not prone to falling off after washing, the breaking strength, anti-pilling performance and wear resistance of the finished cotton fabric are obviously improved, and the service life of the fabric is prolonged. And after being washed for multiple times, the fabric still has good breaking strength and wear resistance, so that the fabric damage caused by wear is reduced, the anti-pilling effect is enhanced, the flatness and attractiveness of the fabric are ensured, and the overall service life of a product made of the fabric is remarkably prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of fabrics, in particular to a wear-resistant and anti-pilling composite fabric and a preparation method thereof. Background Art

[0002] Cotton fabrics have good moisture absorption, air permeability and wearing comfort, and are widely used in clothing and home textile products. With the continuous improvement of people's living standards, the market demand for high-end clothing and home textile products is growing. Therefore, further improving the comprehensive performance of cotton fabrics has become a current research hotspot.

[0003] The surface of traditional cotton fabrics is relatively soft, and they are prone to curling and pilling after friction. Using finishing agents to finish cotton fabrics can solve the problems of poor mechanical properties and wear resistance, as well as easy pilling. Among them, polyamide finishing agents have the advantages of simple preparation methods and good hydrophilicity, making them an ideal choice for improving the performance of cotton fabrics.

[0004] Patent CN109137526B discloses a method for preparing a formaldehyde-free anti-wrinkle finishing agent and its application. The formaldehyde-free anti-wrinkle finishing agent is prepared by using ethylenediamine, methyl acrylate, polyethylene polyamine, glyoxal and the like as reactants. After two-immersion and two-rolling finishing of cotton fabric, the anti-wrinkle and other properties of cotton fabric are improved. Polyaramid is a high molecular polymer with high mechanical strength and good wear resistance. Compared with the patent, the present invention uses betaine polyaramid finishing agent to solve the problem of poor wear resistance and anti-pilling properties of cotton fabric. Summary of the invention

[0005] (I) Technical problems to be solved: In view of the deficiencies in the prior art, the present invention provides a cotton fabric with high hydrophilicity, good wear resistance and anti-pilling and a composite fabric thereof.

[0006] (II) Technical solution: A method for preparing a wear-resistant and anti-pilling composite fabric:

[0007] S1. Add 5-[2-(dimethylamino)acetylamino]isophthalic acid, p-phenylenediamine, pyridine and triphenyl phosphite in a molar ratio of (1-1.05):1:(2.8-3.4):(2.5-3) to N-methylpyrrolidone, heat to the reaction temperature in a nitrogen atmosphere, cool after the reaction, add ethanol and water, filter, wash with ethanol, and dry to obtain polyaromatic amide.

[0008] S2. Add polyaromatic amide and 3-chloro-2-hydroxypropionic acid (CAS registration number 1713-85-5) in a mass ratio of 100:(12-35) to N,N-dimethylformamide, heat to the reaction temperature, cool after the reaction, add ethanol, filter, wash with ethanol, and dry to obtain a betaine polyaromatic amide finishing agent.

[0009]

[0010] S3. Add betaine polyaramid finishing agent and emulsifier to water in a mass ratio of 1000:(20-60):(0.3-1), stir and add cotton fabric composite fabric for finishing, double dipping and double rolling, pre-baking and baking to obtain wear-resistant and anti-pilling composite fabric.

[0011] Preferably, the reaction temperature in (1) is 90-110° C. and the reaction time is 6-10 h.

[0012] Preferably, the preparation method of 5-[2-(dimethylamino)acetylamino]isophthalic acid is as follows: in an ice bath, add dichloromethane in a molar ratio of 1:(1.1-1.4):(1.1-

[0013] 1.6) 5-aminoisophthalic acid (CAS registration number 99-31-0), (dimethylamino) acetyl chloride (CAS registration number 51552-16-0), and a catalyst, after the reaction, the product is distilled under reduced pressure, added to water, concentrated hydrochloric acid is added dropwise to adjust the pH to 4-5, a precipitate is precipitated, the product is filtered and recrystallized in dichloromethane to obtain 5-[2-(dimethylamino) acetylamino]isophthalic acid. The reaction formula is:

[0014]

[0015] Preferably, the catalyst is triethylamine or N,N-diisopropylethylamine.

[0016] Preferably, the reaction temperature in (2) is 90-120° C. and the reaction time is 24-36 h.

[0017] Preferably, the emulsifier is OP-10.

[0018] Preferably, the rolling rate of the double dipping and double rolling in (3) is 80-90%, the temperature during pre-baking is 80-85°C, the time is 3-5 minutes, and the temperature during baking is 150-170°C, the time is 3-4 minutes.

[0019] Preferably, the cotton fabric composite fabric is cotton fabric, polyester-cotton fabric, nylon / cotton fabric, polypropylene / cotton fabric or spandex / cotton fabric.

[0020] (III) Beneficial technical effects:

[0021] The present invention carries out an amidation condensation reaction on 5-[2-(dimethylamino)acetylamino]isophthalic acid and p-phenylenediamine, and then carries out a quaternization reaction on the tertiary amine group of the side chain and 3-chloro-2-hydroxypropionic acid to obtain betaine polyaromatic amide, and finishes the cotton fabric composite fabric. The polyaromatic amide has excellent mechanical strength and wear resistance, and is tightly attached to the surface of the cotton fabric. The breaking strength, anti-pilling performance and wear resistance of the finished cotton fabric are significantly improved, and the side chain of the betaine polyaromatic amide contains active hydroxyl groups, which interact with the hydroxyl groups on the surface of the cotton fabric by hydrogen bonding, etc., thereby improving the bonding force between the two, so that the polyaromatic amide finishing agent is more firmly attached to the fabric surface and is not easy to fall off after washing. After multiple washings, the fabric still has good breaking strength and wear resistance.

[0022] The polyaromatic amide finishing agent of the invention contains a hydrophilic betaine hydrophilic group formed by a hydrophilic hydroxyl group, a quaternary ammonium salt cation and a carboxylic acid anion in the side chain, so that the cotton fiber still maintains a high water absorption rate and hydrophilicity.

[0023] Through the above-mentioned improvements, fabric damage caused by wear is reduced, the anti-pilling effect is enhanced, the smoothness and beauty of the fabric are ensured, thereby significantly extending the overall service life of the products made of the fabric. When the fabric is used to support clothing, it helps to ensure that the clothing can maintain a good shape and texture after frequent use and washing, thereby enhancing the durability and practicality of the clothing. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present disclosure clearer, the technical solution of the present disclosure will be clearly and completely described in combination with the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other without conflict.

[0025] Embodiment 1:

[0026] S1. In an ice bath, 50 mmol 5-aminoisophthalic acid, 70 mmol (dimethylamino)acetyl chloride and 80 mmol N,N-diisopropylethylamine were added to 140 mL dichloromethane. After the reaction, the mixture was distilled under reduced pressure. The product was added to water, and concentrated hydrochloric acid was added dropwise to adjust the pH to 5. The precipitate was filtered and the product was recrystallized from dichloromethane to obtain 5-[2-(dimethylamino)acetylamino]isophthalic acid.

[0027] S2. Add 40 mmol 5-[2-(dimethylamino)acetylamino]isophthalic acid, 40 mmol p-phenylenediamine, 122 mmol pyridine and 116 mmol triphenyl phosphite to 60 mL N-methylpyrrolidone, heat to 90°C in a nitrogen atmosphere, react for 10 h, cool, add ethanol and water, filter, wash with ethanol, and dry to obtain polyaromatic amide.

[0028] S3. Add 20 g of polyaromatic amide and 2.4 g of 3-chloro-2-hydroxypropionic acid to 250 mL of N,N-dimethylformamide, heat to 90°C, react for 30 hours, cool, add ethanol, filter, wash with ethanol, and dry to obtain a betaine polyaromatic amide finishing agent.

[0029] S4. Add 20g of betaine polyaramid finishing agent and 0.3g of emulsifier OP-10 to 1L of water, stir and then add cotton fabric composite fabric for finishing, the bath ratio is 1:25, double immersion and double rolling, the rolling rate is 80%, pre-baking at 80℃ for 4min, baking at 160℃ for 4min, to obtain wear-resistant and anti-pilling composite fabric.

[0030] Embodiment 2:

[0031] S1. In an ice bath, 50 mmol 5-aminoisophthalic acid, 55 mmol (dimethylamino)acetyl chloride and 55 mmol triethylamine were added to 120 mL dichloromethane. After the reaction, the mixture was distilled under reduced pressure. The product was added to water, and concentrated hydrochloric acid was added dropwise to adjust the pH to 4. A precipitate was precipitated. After filtering, the product was recrystallized from dichloromethane to obtain 5-[2-(dimethylamino)acetylamino]isophthalic acid.

[0032] S2. Add 42 mmol 5-[2-(dimethylamino)acetylamino]isophthalic acid, 40 mmol p-phenylenediamine, 136 mmol pyridine and 120 mmol triphenyl phosphite to 70 mL N-methylpyrrolidone, heat to 90°C in a nitrogen atmosphere, react for 10 h, cool, add ethanol and water, filter, wash with ethanol, and dry to obtain polyaromatic amide.

[0033] S3. Add 20 g of polyaromatic amide and 4 g of 3-chloro-2-hydroxypropionic acid to 250 mL of N,N-dimethylformamide, heat to 110°C, react for 36 hours, cool, add ethanol, filter, wash with ethanol, and dry to obtain a betaine polyaromatic amide finishing agent.

[0034] S4. Add 30g of betaine polyaramid finishing agent and 0.5g of emulsifier OP-10 to 1L of water, stir and then add cotton fabric composite fabric for finishing, the bath ratio is 1:25, double immersion and double rolling, the rolling rate is 90%, pre-baking at 80°C for 5min, baking at 170°C for 3min, to obtain wear-resistant and anti-pilling composite fabric.

[0035] Embodiment 3:

[0036] S1. Add 40 mmol 5-[2-(dimethylamino)acetylamino]isophthalic acid (prepared in the same manner as in Example 1), 40 mmol p-phenylenediamine, 112 mmol pyridine, and 100 mmol triphenyl phosphite to 50 mL N-methylpyrrolidone, heat to 100° C. in a nitrogen atmosphere, react for 10 h, cool, add ethanol and water, filter, wash with ethanol, and dry to obtain polyaromatic amide.

[0037] S2. Add 20 g of polyaromatic amide and 5.5 g of 3-chloro-2-hydroxypropionic acid to 300 mL of N,N-dimethylformamide, heat to 120°C, react for 24 hours, cool, add ethanol, filter, wash with ethanol, and dry to obtain a betaine polyaromatic amide finishing agent.

[0038] S3. Add 45g of betaine polyaramid finishing agent and 0.7g of emulsifier OP-10 to 1L of water, stir and then add cotton fabric composite fabric for finishing, the bath ratio is 1:25, double immersion and double rolling, the rolling rate is 90%, pre-baking at 85℃ for 4min, baking at 160℃ for 4min, to obtain wear-resistant and anti-pilling composite fabric.

[0039] Embodiment 4:

[0040] S1. Add 40 mmol 5-[2-(dimethylamino)acetylamino]isophthalic acid (prepared in the same manner as in Example 1), 40 mmol p-phenylenediamine, 112 mmol pyridine, and 108 mmol triphenyl phosphite to 60 mL N-methylpyrrolidone, heat to 110° C. in a nitrogen atmosphere, react for 6 h, cool, add ethanol and water, filter, wash with ethanol, and dry to obtain polyaromatic amide.

[0041] S2. Add 20 g of polyaromatic amide and 7 g of 3-chloro-2-hydroxypropionic acid to 300 mL of N,N-dimethylformamide, heat to 110°C, react for 36 hours, cool, add ethanol, filter, wash with ethanol, and dry to obtain a betaine polyaromatic amide finishing agent.

[0042] S3. Add 60g of betaine polyaramid finishing agent and 1g of emulsifier OP-10 to 1L of water, stir and then add cotton fabric composite fabric for finishing, the bath ratio is 1:25, double immersion and double rolling, the rolling rate is 85%, pre-baking at 85℃ for 3min, baking at 150℃ for 4min, to obtain wear-resistant and anti-pilling composite fabric.

[0043] Comparative Example 1 is an unfinished cotton fabric.

[0044] Comparative Example 2:

[0045] S1. Add 20g of polyaromatic amide (prepared by Example 1) and 0.3g of emulsifier OP-10 to 1L of water, stir and then add cotton fabric composite fabric for finishing, the bath ratio is 1:25, double immersion and double rolling, the rolling rate is 80%, pre-baking at 80℃ for 4min, baking at 160℃ for 4min, to obtain wear-resistant and anti-pilling composite fabric.

[0046] Comparative Example 3:

[0047] S1. Add 20 g of polyaromatic amide (prepared in Example 1) and 2.4 g of chloroacetic acid to 250 mL of N,N-dimethylformamide, heat to 90° C., react for 30 h, cool, add ethanol, filter, wash with ethanol, and dry to obtain a betaine polyaromatic amide finishing agent.

[0048] S2. Add 20g of betaine polyaramid finishing agent and 0.3g of emulsifier OP-10 to 1L of water, stir and then add the cotton fabric composite fabric for finishing, the bath ratio is 1:25, and two dips and two rolls are performed, the roll residue rate is 80%, pre-baked at 80°C for 4min, and baked at 160°C for 4min to obtain a wear-resistant and anti-pilling composite fabric.

[0049] Test the anti-pilling grade of fabrics according to GB / T 4802.2-2008 standard. The test result is the average value of all testers, rounded to the nearest 0.5 grade. The larger the grade, the better the anti-pilling performance. Wash and dry the fabrics according to GB / T 8629-2017 standard, repeat 30 times. Test the anti-pilling grade again.

[0050] Table 1

[0051]

[0052] Test the breaking strength of fabrics according to GB / T 3923.1-2013. Test each set of samples 5 times and take the average value. Wash and dry the fabrics according to GB / T 8629-2017, repeat 30 times. Test the breaking strength again.

[0053] Table 2

[0054]

[0055]

[0056] According to GB / T 21196.2-2007 standard, the abrasion resistance of fabrics was tested 5 times for each group of samples, and the average value was taken. The greater the abrasion resistance, the better the abrasion resistance.

[0057] Dry the fabric sample, weigh it, soak it in water for 1 hour, take it out and hang it in the air for 20 minutes until no obvious water drops fall, weigh it, and calculate the water absorption rate.

[0058] Water absorption rate = (mass after water absorption - mass before absorption) / mass before absorption × 100%.

[0059] Table 3

[0060]

[0061]

[0062] After testing, compared with Comparative Example 1, Examples 1-4 used betaine polyaramid to perform surface finishing on cotton fabrics, and the breaking strength, anti-pilling performance and wear resistance of the finished cotton fabrics were significantly improved, and after multiple washings, the fabrics still had good breaking strength and wear resistance, mainly because the side chains of betaine polyaramid contained active hydroxyl groups, which interacted with the hydroxyl groups on the surface of the cotton fabric by hydrogen bonds, etc., and improved the binding force between the two, so that the polyaramid finishing agent was more firmly attached to the fabric surface and was not easy to fall off after washing. In addition, the side chains of the polyaramid finishing agent contained hydrophilic hydroxyl groups, quaternary ammonium salt cations and carboxylic acid anions, which made the cotton fiber still have high water absorption and hydrophilicity.

[0063] The polyaramid in Comparative Example 2 does not contain hydroxyl groups, and has low binding force with cotton fabric. After multiple washings, the polyaramid falls off, resulting in a significant decrease in the anti-pilling grade and breaking strength of the fabric. It also does not contain hydrophilic betaine groups, resulting in low water absorption of cotton fabric and poor hydrophilicity.

[0064] In Comparative Example 3, chloroacetic acid is reacted with polyaramid to obtain betaine polyaramid that does not contain hydroxyl groups and has low binding force with cotton fabrics. After multiple washings, the polyaramid falls off during washing, resulting in a significant decrease in the anti-pilling grade and breaking strength of the fabric.

[0065] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A method for preparing a wear-resistant and anti-pilling composite fabric, characterized in that: The preparation method comprises the following steps: S1. Add 5-[2-(dimethylamino)acetylamino]isophthalic acid, p-phenylenediamine, pyridine and triphenyl phosphite to N-methylpyrrolidone, heat to the reaction temperature in a nitrogen atmosphere, cool after the reaction, add ethanol and water, filter, wash and dry to obtain polyaromatic amide; S2. Add polyaromatic amide and 3-chloro-2-hydroxypropionic acid to N,N-dimethylformamide, heat to the reaction temperature, cool after the reaction, add ethanol, filter, wash, and dry to obtain a betaine polyaromatic amide finishing agent; S3. Add betaine polyaramid finishing agent and emulsifier to water, stir and add cotton fabric composite fabric for finishing, double dipping and double rolling, pre-baking and baking to obtain wear-resistant and anti-pilling composite fabric.

2. The method for preparing the wear-resistant and anti-pilling composite fabric according to claim 1, characterized in that: The reaction temperature in (1) is 90-110° C. and the reaction time is 6-10 h.

3. The method for preparing the wear-resistant and anti-pilling composite fabric according to claim 1, characterized in that: The molar ratio of 5-[2-(dimethylamino)acetylamino]isophthalic acid, p-phenylenediamine, pyridine and triphenyl phosphite in (1) is (1-1.05): 1: (2.8-3.4):(2.5-3)。 4. The method for preparing the wear-resistant and anti-pilling composite fabric according to claim 3, characterized in that: The preparation method of 5-[2-(dimethylamino)acetylamino]isophthalic acid is as follows: in an ice bath, add dichloromethane in a molar ratio of 1:(1.1-1.4): (1.1-1.6) 5-aminoisophthalic acid, (dimethylamino)acetyl chloride, and a catalyst, and distill under reduced pressure after the reaction. The product is added to water, and concentrated hydrochloric acid is added dropwise to adjust the pH to 4-5. A precipitate is precipitated, and the product is filtered and recrystallized in dichloromethane to obtain 5-[2-(dimethylamino)acetylamino]isophthalic acid.

5. The method for preparing the wear-resistant and anti-pilling composite fabric according to claim 4, characterized in that: The catalyst is triethylamine or N,N-diisopropylethylamine.

6. The method for preparing the wear-resistant and anti-pilling composite fabric according to claim 1, characterized in that: The mass ratio of polyaromatic amide to 3-chloro-2-hydroxypropionic acid in (2) is 100:(12-35).

7. The method for preparing the wear-resistant and anti-pilling composite fabric according to claim 1, characterized in that: The reaction temperature in (2) is 90-120°C and the reaction time is 24-36h.

8. The method for preparing the wear-resistant and anti-pilling composite fabric according to claim 1, characterized in that: The mass ratio of water, betaine polyaramid finishing agent and emulsifier in (3) is 1000:(20-60):(0.3-1); the emulsifier is OP-10.

9. The method for preparing the wear-resistant and anti-pilling composite fabric according to claim 1, characterized in that: In the above-mentioned step (3), the rolling rate of the double dipping and double rolling is 80-90%, the temperature of the pre-baking is 80-85°C, the time is 3-5 minutes, and the temperature of the baking is 150-170°C, the time is 3-4 minutes.

10. A wear-resistant and anti-pilling composite fabric obtained by the preparation method according to any one of claims 1 to 9.

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