Anti-pilling thermal insulation fiber fabric and preparation method thereof

Abstract

The present invention relates to the technical field of fabrics, specifically to an anti-pilling thermal insulation fiber fabric and a preparation method thereof. The anti-pilling thermal insulation fiber fabric comprises an inner fabric, an outer fabric and a filling layer filled between the inner fabric and the outer fabric, wherein the inner fabric is made by knitting a blended yarn of acrylic fiber and cotton fiber, wherein the acrylic fiber is modified, and the acrylic fiber is sequentially reacted with a sodium hydroxide aqueous solution, dichlorothionyl, polyaminopropyl biguanide and methyl iodide, and the prepared modified acrylic fiber contains biguanide groups and quaternary ammonium salts, so that the acrylic fiber not only has excellent antibacterial properties, but also has good antistatic properties. The fabric prepared by the present invention not only has excellent warmth retention and anti-pilling properties, but also has good antibacterial and antistatic properties, and can be made into close-fitting clothing, which has both warmth retention, comfort, aesthetics and safety.

Description

Technical Field

[0001] The invention relates to the technical field of fabrics, in particular to an anti-pilling warm-keeping fiber fabric and a preparation method thereof. Background Art

[0002] In modern society, people have higher and higher requirements for clothing, including the comfort and aesthetic functions of clothing. Acrylic fiber has good warmth retention, fluffy and soft properties, and is known as artificial wool, and is widely used in the field of knitted clothing. However, acrylic fabrics are prone to pilling, and the fiber pellets formed are not easy to fall off, and will remain on the surface of the fabric for a long time, seriously affecting the aesthetics and wearing comfort of the fabric. In addition, acrylic has poor electrical conductivity, and acrylic fabrics are prone to accumulate static electricity, affecting wearing comfort.

[0003] Therefore, it is necessary to improve the anti-pilling and antistatic properties of acrylic fabrics by blending acrylic fibers with other fibers or modifying acrylic fibers. Chinese patent application CN104631108A discloses an antistatic acrylic fabric, in which a metal oxide with antistatic effect is prepared into a finishing liquid by a nano-agent metal oxide powder dispersion method, and the acrylic fabric is subjected to padding finishing, so that the acrylic fabric obtains antistatic properties. However, as the use time increases, the antistatic layer falls off the fabric, causing the antistatic property of the fabric to gradually decrease or be lost. Chinese patent CN103741461B discloses an acrylic fabric finishing agent and a preparation method thereof, wherein the finishing agent is composed of the following components: sodium hexadecyl sulfate, sodium alkyl diphenyl ether disulfonate, sodium dodecyl carboxylate, calcium chloride, tributyl phosphate, tryptophan, glycerol, and water. After finishing, the fabric has good anti-pilling and flame retardant effects, but the anti-pilling and flame retardant properties of the finished fabric will also gradually decrease or be lost as the use time increases. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an anti-pilling thermal insulation fiber fabric and a preparation method thereof, so as to solve the problem that the acrylic fiber fabric in the prior art has poor anti-pilling and antistatic properties.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0007] Step 1, heating the sodium hydroxide aqueous solution to a set temperature, adding acrylic fiber, reacting, purifying, and drying after the reaction to obtain hydrolyzed acrylic fiber;

[0008] Step 2: adding the hydrolyzed acrylic fiber into N,N-dimethylformamide, and after dissolving, adding thionyl chloride dropwise, reacting after the addition is complete, purifying, and drying to obtain chlorinated acrylic fiber;

[0009] Step 3: adding chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, adding polyaminopropyl biguanide and triethylamine to react, and after the reaction is completed, purifying and drying to obtain polyaminopropyl biguanide grafted modified acrylic fiber;

[0010] Step 4: adding polyaminopropyl biguanide grafted modified acrylic fiber into N,N-dimethylformamide, and after dissolving, adding methyl iodide to react, and after the reaction is completed, purifying and drying to obtain modified acrylic fiber;

[0011] Step 5: blending the modified acrylic fiber with the cotton fiber to obtain a blended yarn, and spinning the blended yarn into a fabric through a knitting process to obtain an inner layer fabric;

[0012] Step 6: Use pure cotton fiber knitted fabric as the outer fabric, lay filling fiber between the inner fabric and the outer fabric, and sew them to obtain anti-pilling warm fiber fabric.

[0013] Preferably, in the step 1, the mass ratio of acrylic fiber to sodium hydroxide aqueous solution is 20:(175-195), and the reaction condition is to react at a set temperature for 4-8 minutes, and the set temperature is 70-90°C.

[0014] Preferably, the sodium hydroxide aqueous solution is a 3wt%-5wt% sodium hydroxide aqueous solution.

[0015] Preferably, the purification comprises leaching and washing.

[0016] Preferably, in the step 2, the mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide and dichlorothionyl is 100:(400-500):(10-15), and the reaction is carried out at a temperature of 40-60° C. for 1-3 hours.

[0017] Preferably, the dropping time of the thionyl chloride is 30-60 min.

[0018] Preferably, the purification comprises precipitation, filtration and washing.

[0019] Preferably, in step three, the mass ratio of chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine and N,N-dimethylformamide is (105-110):(10-15):(5-10):(450-550), and the reaction conditions are in an inert gas atmosphere at a temperature of 50-70°C for 20-30h.

[0020] Preferably, the purification comprises precipitation, filtration and washing.

[0021] Preferably, in step 4, the mass ratio of polyaminopropyl biguanide grafted modified acrylic fiber, methyl iodide and N,N-dimethylformamide is (115-125):(5-10):(400-500), and the reaction conditions are 75-85°C for 8-12h.

[0022] Preferably, the purification comprises precipitation, filtration and washing.

[0023] Preferably, in step 5, the mass ratio of modified acrylic fiber to cotton fiber is 1:1, the count of the blended yarn is 30-40S (English count), and the gram weight of the inner layer fabric is 80-100g / m 2 .

[0024] Preferably, in step 6, the pure cotton fiber knitted fabric is spun from pure cotton yarn through a knitting process, and the weight of the pure cotton fiber knitted fabric is 100-120 g / m 2 .

[0025] Preferably, in step 6, the filling amount of the filling fiber is 60-80 g / m 2 , the filling fiber includes polyester fiber.

[0026] Preferably, pure cotton sewing thread is used for sewing.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present invention, the anti-pilling thermal insulation fiber fabric comprises an inner fabric, an outer fabric and a filling layer filled between the inner fabric and the outer fabric, and an air barrier is formed between the inner fabric and the outer fabric to reduce air convection inside and outside the fabric, so that the thermal insulation performance of the fabric is good;

[0029] The inner layer fabric of the anti-pilling warm fiber fabric of the present invention is prepared by knitting a blended yarn of acrylic fiber and cotton fiber. The acrylic fiber is fluffy and soft and has good warmth retention, and the cotton fiber has the characteristics of good warmth retention, hygroscopicity and antistatic properties. The blending of cotton fiber and acrylic fiber can not only improve the hygroscopicity and antistatic properties of the fabric, but also improve the anti-pilling performance of the fabric because the cotton fiber has a large cohesive force and the fiber is not easy to slip out of the fabric surface.

[0030] The acrylic fiber of the present invention is subjected to modification treatment. First, a cyano group in the acrylic fiber is converted into a carboxyl group through a hydrolysis reaction in an alkali solution. Then, the carboxyl group reacts with thionyl chloride to form an acyl chloride group. Then, the acyl chloride group reacts with an amino group in a polyaminopropyl biguanide molecule to connect the acrylic fiber with the polyaminopropyl biguanide through an amide bond, and a biguanide group is introduced into the acrylic fiber molecule to give the acrylic fiber antibacterial properties. Finally, the amide bond reacts with iodomethane to generate a quaternary ammonium salt. The presence of the quaternary ammonium salt not only further improves the antibacterial properties of the acrylic fiber, but also has good antistatic properties. In addition, under the etching action of the alkali solution, the acrylic fiber can form a microporous structure and a surface roughening, so that the cohesion between the fibers is increased and the anti-pilling performance is improved.

[0031] The fabric prepared by the invention not only has excellent warmth retention and anti-pilling properties, but also has good antibacterial and antistatic properties, and can be made into close-fitting clothing with warmth retention, comfort, aesthetics and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a process flow chart for preparing the modified acrylic fiber;

[0033] Figure 2 This is the infrared spectrum of the polyaminopropyl biguanide grafted modified acrylic fiber obtained in step 3 of Example 1 of the present invention;

[0034] Figure 3 It is a bar graph of the anti-pilling performance test results of the anti-pilling thermal insulation fiber fabrics prepared in Examples 1-6 and Comparative Examples 1-3 of the present invention;

[0035] Figure 4 It is a bar graph of the antistatic performance test results of the anti-pilling thermal insulation fiber fabrics prepared in Examples 1-6 and Comparative Examples 1-3 of the present invention;

[0036] Figure 5 It is a bar graph showing the test results of the antibacterial properties of the anti-pilling thermal insulation fiber fabrics prepared in Examples 1-6 and Comparative Examples 1-3 of the present invention. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0040] Step 1, heating a 3wt% sodium hydroxide aqueous solution to 70°C, adding acrylic fiber, the mass ratio of acrylic fiber to 3wt% sodium hydroxide aqueous solution is 20:175, reacting at 70°C for 8min, after the reaction, draining, washing with deionized water for 3 times, and drying in a 60°C vacuum drying oven for 10h to obtain hydrolyzed acrylic fiber;

[0041] Step 2, adding the hydrolyzed acrylic fiber to N,N-dimethylformamide, and after dissolving, adding dithionyl chloride dropwise, the mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide, and dithionyl chloride is 100:400:10, and the dithionyl chloride addition time is 30 minutes. After the addition is completed, react at 40°C for 3 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a 60°C vacuum drying oven for 10 hours to obtain chlorinated acrylic fiber;

[0042] Step 3: Add the chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, add polyaminopropyl biguanide and triethylamine, the mass ratio of the chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine, and N,N-dimethylformamide is 105:10:5:450, and react for 30 hours at 50°C in an argon atmosphere. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain polyaminopropyl biguanide grafted modified acrylic fiber;

[0043] The polyaminopropyl biguanide grafted modified acrylic fiber was analyzed by Varian 640 infrared spectrometer. Figure 2 As shown, 3480cm -1 The NH bond stretching vibration peak is 2860cm -1 The peak at 1720 cm is the stretching vibration peak of the C=N bond. −1 is the stretching vibration peak of C=O, 2243cm -1 The characteristic peak of nitrile group (-CN) is shown, which shows that polyaminopropyl biguanide is successfully grafted onto the acyl chloride acrylic fiber molecules;

[0044] Step 4: Add the polyaminopropyl biguanide grafted modified acrylic fiber to N,N-dimethylformamide, and after dissolving, add iodomethane, the mass ratio of the polyaminopropyl biguanide grafted modified acrylic fiber, iodomethane, and N,N-dimethylformamide is 115:5:400, and react at 75°C for 12 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain modified acrylic fiber;

[0045] Step 5: Blend the modified acrylic fiber and the cotton fiber in a mass ratio of 1:1 to obtain a blended yarn, the count of the blended yarn is 30S, and the blended yarn is spun into a fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 80g / m 2 ;

[0046] Step 6: Use pure cotton fiber knitted fabric as the outer fabric, and fill it with 60g / m between the inner and outer fabrics. 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0047] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 100g / m 2 .

[0048] Example 2

[0049] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0050] Step 1, heating a 5wt% sodium hydroxide aqueous solution to 90°C, adding acrylic fiber, the mass ratio of acrylic fiber to 5wt% sodium hydroxide aqueous solution is 20:195, reacting at 90°C for 4 minutes, after the reaction, draining, washing with deionized water for 3 times, and drying in a 60°C vacuum drying oven for 10 hours to obtain hydrolyzed acrylic fiber;

[0051] Step 2: adding the hydrolyzed acrylic fiber to N,N-dimethylformamide, and after dissolving, adding dithionyl chloride dropwise, the mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide, and dithionyl chloride is 100:500:15, and the dithionyl chloride addition time is 60 minutes. After the addition is completed, react at 60° C. for 1 hour. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a 60° C. vacuum drying oven for 10 hours to obtain chlorinated acrylic fiber;

[0052] Step 3: Add the chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, add polyaminopropyl biguanide and triethylamine, the mass ratio of the chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine, and N,N-dimethylformamide is 110:15:10:550, and react at 70°C in an argon atmosphere for 20 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain polyaminopropyl biguanide grafted modified acrylic fiber;

[0053] Step 4: Add the polyaminopropyl biguanide grafted modified acrylic fiber to N,N-dimethylformamide, and after dissolving, add iodomethane, the mass ratio of the polyaminopropyl biguanide grafted modified acrylic fiber, iodomethane, and N,N-dimethylformamide is 125:10:500, and react at 85°C for 8h. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10h to obtain modified acrylic fiber;

[0054] Step 5: Blend the modified acrylic fiber and the cotton fiber in a mass ratio of 1:1 to obtain a blended yarn, the count of the blended yarn is 40S, and the blended yarn is spun into a fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 100g / m 2 ;

[0055] Step 6: Use pure cotton fiber knitted fabric as the outer fabric, and fill it with 80g / m2 between the inner and outer fabrics. 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0056] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 120g / m 2 .

[0057] Example 3

[0058] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0059] Step 1, heating a 4wt% sodium hydroxide aqueous solution to 80°C, adding acrylic fiber, the mass ratio of acrylic fiber to 4wt% sodium hydroxide aqueous solution is 20:179, reacting at 80°C for 6 minutes, after the reaction, draining, washing with deionized water for 3 times, and drying in a 60°C vacuum drying oven for 10 hours to obtain hydrolyzed acrylic fiber;

[0060] Step 2: adding the hydrolyzed acrylic fiber to N,N-dimethylformamide, and after dissolving, adding dithionyl chloride dropwise, the mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide, and dithionyl chloride is 100:420:11, and the dithionyl chloride addition time is 45 minutes. After the addition is completed, react at 50° C. for 2 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a 60° C. vacuum drying oven for 10 hours to obtain chlorinated acrylic fiber;

[0061] Step 3: Add the chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, add polyaminopropyl biguanide and triethylamine, the mass ratio of the chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine, and N,N-dimethylformamide is 106:11:6:470, and react at 60°C in an argon atmosphere for 25 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain polyaminopropyl biguanide grafted modified acrylic fiber;

[0062] Step 4: Add the polyaminopropyl biguanide grafted modified acrylic fiber to N,N-dimethylformamide, and after dissolving, add iodomethane, the mass ratio of the polyaminopropyl biguanide grafted modified acrylic fiber, iodomethane, and N,N-dimethylformamide is 117:6:420, and react at 80°C for 10 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain modified acrylic fiber;

[0063] Step 5: Blend the modified acrylic fiber and the cotton fiber in a mass ratio of 1:1 to obtain a blended yarn, the count of the blended yarn is 35S, and the blended yarn is spun into a fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 90g / m 2 ;

[0064] Step 6: Use pure cotton fiber knitted fabric as the outer fabric, and fill the inner and outer fabrics with 70g / m 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0065] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 110g / m 2 .

[0066] Example 4

[0067] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0068] Step 1, heating a 4wt% sodium hydroxide aqueous solution to 80°C, adding acrylic fiber, the mass ratio of acrylic fiber to 4wt% sodium hydroxide aqueous solution is 20:183, reacting at 80°C for 6 minutes, after the reaction, draining, washing with deionized water for 3 times, and drying in a 60°C vacuum drying oven for 10 hours to obtain hydrolyzed acrylic fiber;

[0069] Step 2: adding the hydrolyzed acrylic fiber to N,N-dimethylformamide, and after dissolving, adding dithionyl chloride dropwise, the mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide, and dithionyl chloride is 100:440:12, and the dithionyl chloride addition time is 45 minutes. After the addition is completed, react at 50°C for 2 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a 60°C vacuum drying oven for 10 hours to obtain chlorinated acrylic fiber;

[0070] Step 3: Add the chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, add polyaminopropyl biguanide and triethylamine, the mass ratio of the chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine, and N,N-dimethylformamide is 107:12:7:490, and react for 25 hours at 60°C in an argon atmosphere. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain polyaminopropyl biguanide grafted modified acrylic fiber;

[0071] Step 4: Add the polyaminopropyl biguanide grafted modified acrylic fiber to N,N-dimethylformamide, and after dissolving, add iodomethane, the mass ratio of the polyaminopropyl biguanide grafted modified acrylic fiber, iodomethane, and N,N-dimethylformamide is 119:7:440, and react at 80°C for 10 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain modified acrylic fiber;

[0072] Step 5: Blend the modified acrylic fiber and the cotton fiber in a mass ratio of 1:1 to obtain a blended yarn, the count of the blended yarn is 35S, and the blended yarn is spun into a fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 90g / m 2 ;

[0073] Step 6: Use pure cotton fiber knitted fabric as the outer fabric, and fill the inner and outer fabrics with 70g / m 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0074] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 110g / m 2 .

[0075] Example 5

[0076] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0077] Step 1, heating a 4wt% sodium hydroxide aqueous solution to 80°C, adding acrylic fiber, the mass ratio of acrylic fiber to 4wt% sodium hydroxide aqueous solution is 20:187, reacting at 80°C for 6 minutes, after the reaction, draining, washing with deionized water for 3 times, and drying in a 60°C vacuum drying oven for 10 hours to obtain hydrolyzed acrylic fiber;

[0078] Step 2: adding the hydrolyzed acrylic fiber to N,N-dimethylformamide, and after dissolving, adding dithionyl chloride dropwise, the mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide, and dithionyl chloride is 100:460:13, and the dithionyl chloride addition time is 45 minutes. After the addition is completed, react at 50°C for 2 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a 60°C vacuum drying oven for 10 hours to obtain chlorinated acrylic fiber;

[0079] Step 3: Add the chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, add polyaminopropyl biguanide and triethylamine, the mass ratio of chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine, and N,N-dimethylformamide is 108:13:8:510, and react at 60°C in an argon atmosphere for 25 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain polyaminopropyl biguanide grafted modified acrylic fiber;

[0080] Step 4: Add the polyaminopropyl biguanide grafted modified acrylic fiber to N,N-dimethylformamide, and after dissolving, add iodomethane, the mass ratio of the polyaminopropyl biguanide grafted modified acrylic fiber, iodomethane, and N,N-dimethylformamide is 121:8:460, and react at 80°C for 10 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain modified acrylic fiber;

[0081] Step 5: Blend the modified acrylic fiber and the cotton fiber in a mass ratio of 1:1 to obtain a blended yarn, the count of the blended yarn is 35S, and the blended yarn is spun into a fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 90g / m 2 ;

[0082] Step 6: Use pure cotton fiber knitted fabric as the outer fabric, and fill the inner and outer fabrics with 70g / m 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0083] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 110g / m 2 .

[0084] Example 6

[0085] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0086] Step 1, heating a 4wt% sodium hydroxide aqueous solution to 80°C, adding acrylic fiber, the mass ratio of acrylic fiber to 4wt% sodium hydroxide aqueous solution is 20:191, reacting at 80°C for 6 minutes, after the reaction, draining, washing with deionized water for 3 times, and drying in a 60°C vacuum drying oven for 10 hours to obtain hydrolyzed acrylic fiber;

[0087] Step 2: adding the hydrolyzed acrylic fiber to N,N-dimethylformamide, and after dissolving, adding dithionyl chloride dropwise, the mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide, and dithionyl chloride is 100:480:14, and the dithionyl chloride addition time is 45 minutes. After the addition is completed, react at 50° C. for 2 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a 60° C. vacuum drying oven for 10 hours to obtain chlorinated acrylic fiber;

[0088] Step 3: Add the chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, add polyaminopropyl biguanide and triethylamine, the mass ratio of the chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine, and N,N-dimethylformamide is 109:14:9:530, and react for 25 hours at 60°C in an argon atmosphere. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain polyaminopropyl biguanide grafted modified acrylic fiber;

[0089] Step 4: Add the polyaminopropyl biguanide grafted modified acrylic fiber to N,N-dimethylformamide, and after dissolving, add iodomethane, the mass ratio of the polyaminopropyl biguanide grafted modified acrylic fiber, iodomethane, and N,N-dimethylformamide is 123:9:480, and react at 80°C for 10 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain modified acrylic fiber;

[0090] Step 5: Blend the modified acrylic fiber and the cotton fiber in a mass ratio of 1:1 to obtain a blended yarn, the count of the blended yarn is 35S, and the blended yarn is spun into a fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 90g / m2 ;

[0091] Step 6: Use pure cotton fiber knitted fabric as the outer fabric, and fill the inner and outer fabrics with 70g / m 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0092] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 110g / m 2 .

[0093] Comparative Example 1

[0094] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0095] Step 1: blending acrylic fiber and cotton fiber in a mass ratio of 1:1 to obtain blended yarn, the count of the blended yarn is 40S, and the blended yarn is spun into fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 100g / m 2 ;

[0096] Step 2: Use pure cotton fiber knitted fabric as the outer fabric, and fill it with 80g / m2 between the inner and outer fabrics. 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0097] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 120g / m 2 .

[0098] Comparative Example 2

[0099] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0100] Step 1, heating a 5wt% sodium hydroxide aqueous solution to 90°C, adding acrylic fiber, the mass ratio of acrylic fiber to 5wt% sodium hydroxide aqueous solution is 20:195, reacting at 90°C for 4 minutes, after the reaction, draining, washing with deionized water for 3 times, and drying in a 60°C vacuum drying oven for 10 hours to obtain hydrolyzed acrylic fiber;

[0101] Step 2: adding the hydrolyzed acrylic fiber to N,N-dimethylformamide, and after dissolving, adding dithionyl chloride dropwise, the mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide, and dithionyl chloride is 100:500:15, and the dithionyl chloride addition time is 60 minutes. After the addition is completed, react at 60° C. for 1 hour. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a 60° C. vacuum drying oven for 10 hours to obtain chlorinated acrylic fiber;

[0102] Step 3: Add the chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, add polyaminopropyl biguanide and triethylamine, the mass ratio of the chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine, and N,N-dimethylformamide is 110:15:10:550, and react at 70°C in an argon atmosphere for 20 hours. After the reaction is completed, add ethanol for precipitation until the precipitate no longer increases, filter, wash with deionized water 3 times, and place in a vacuum drying oven at 60°C for 10 hours to obtain polyaminopropyl biguanide grafted modified acrylic fiber;

[0103] Step 4: Blend the polyaminopropyl biguanide grafted modified acrylic fiber and cotton fiber in a mass ratio of 1:1 to obtain a blended yarn, the count of the blended yarn is 40S, and the blended yarn is spun into a fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 100g / m 2 ;

[0104] Step 5: Use pure cotton fiber knitted fabric as the outer fabric, and fill it with 80g / m2 between the inner and outer fabrics. 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0105] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 120g / m 2 .

[0106] Comparative Example 3

[0107] A method for preparing an anti-pilling thermal insulation fiber fabric comprises the following steps:

[0108] Step 1, heating a 5wt% sodium hydroxide aqueous solution to 90°C, adding acrylic fiber, the mass ratio of acrylic fiber to 5wt% sodium hydroxide aqueous solution is 20:195, reacting at 90°C for 4 minutes, after the reaction, draining, washing with deionized water for 3 times, and drying in a 60°C vacuum drying oven for 10 hours to obtain hydrolyzed acrylic fiber;

[0109] Step 2: Blend the hydrolyzed acrylic fiber with the cotton fiber in a mass ratio of 1:1 to obtain a blended yarn, the count of the blended yarn is 40S, and the blended yarn is spun into a fabric through a knitting process to obtain an inner layer fabric, the gram weight of the inner layer fabric is 100g / m 2 ;

[0110] Step 3: Use pure cotton fiber knitted fabric as the outer fabric, and fill it with 80g / m2 between the inner and outer fabrics. 2 After laying the polyester fiber, it is sewn with pure cotton sewing thread to obtain the anti-pilling and warm fiber fabric;

[0111] Among them, pure cotton fiber knitted fabric is made of pure cotton yarn through knitting technology, and the weight of pure cotton fiber knitted fabric is 120g / m 2 .

[0112] In the above embodiments and comparative examples: acrylic fiber is chopped polyacrylonitrile filament purchased from Zhangjiagang Free Trade Zone Rimei Fiber Trading Co., Ltd., with an average length of 38 mm and an average particle size of 1 μm; polyaminopropyl biguanide is purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd., model: ER4354; cotton fiber is long-staple cotton produced in Xinjiang with a length of 38-39.7 mm; polyester fiber is purchased from Nantong Luolai Chemical Fiber Co., Ltd., product specification: 7D*64MMRHCS; pure cotton sewing thread is purchased from Taizhou Yidu Clothing Co., Ltd., product specification: 40S / 2.

[0113] Test example

[0114] The performance tests were conducted on the anti-pilling thermal insulation fiber fabrics prepared in Examples 1-6 and Comparative Examples 1-3:

[0115] (1) Anti-pilling performance test: The anti-pilling thermal insulation fiber fabrics prepared in Examples 1-6 and Comparative Examples 1-3 were cut into square specimens of 150 mm × 150 mm, and the inner fabrics of the specimens were tested on a YG401L Martindale abrasion tester. The selected weight was 395 g, and the friction circles were recorded as 100 cm after 3000 revolutions. 2 The number of hair balls in the test is shown in Table 1:

[0116] Table 1

[0117]

[0118] As shown in Table 1, the fabric prepared by the present invention has good anti-pilling properties. Under the etching action of alkali solution, acrylic fiber can form a microporous structure and roughen the surface, so that the cohesion between fibers is increased and the anti-pilling performance is improved. In Comparative Example 1, because the acrylic fiber has not been etched by sodium hydroxide aqueous solution, the cohesion between fibers is small and the anti-pilling performance is poor.

[0119] (2) Antistatic performance test: The volume resistivity of the anti-pilling thermal insulation fiber fabrics prepared in Examples 1-6 and Comparative Examples 1-3 was tested respectively. The test method was based on the standard GB / T12703.4-2010 "Evaluation of electrostatic properties of textiles Part 4: Resistivity". The test results are shown in Table 2:

[0120] Table 2

[0121]

[0122] As shown in Table 2, the fabric prepared by the present invention has good antistatic properties. The quaternary ammonium salt formed during the modification of acrylic fiber is a cationic antistatic agent, which can effectively improve the antistatic properties of acrylic fiber. In Comparative Examples 1, 2 and 3, since no quaternary ammonium salt is introduced into the acrylic fiber, the antistatic properties are poor.

[0123] (3) Antibacterial performance test: The antibacterial properties of the anti-pilling thermal insulation fiber fabrics prepared in Examples 1-6 and Comparative Examples 1-3 were tested respectively. The test method was based on the standard GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method". The test results are shown in Table 3:

[0124] Table 3

[0125]

[0126] As shown in Table 3, the fabric prepared by the present invention has good antibacterial properties. In the modification process of acrylic fiber, not only biguanidine groups are introduced into the acrylic fiber molecules to give the acrylic fiber antibacterial properties, but also quaternary ammonium salts are generated, which can further enhance the antibacterial properties of the acrylic fiber. In Comparative Example 1 and Comparative Example 3, no antibacterial groups are introduced into the acrylic fiber, and the antibacterial properties of the fabric are poor. In Comparative Example 2, biguanidine groups are introduced into the acrylic fiber molecules, but no quaternary ammonium salts are introduced, and the antibacterial properties are reduced.

[0127] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing an anti-pilling thermal insulation fiber fabric, characterized in that: The following steps are involved: Step 1, heating the sodium hydroxide aqueous solution to a set temperature, adding acrylic fiber, reacting, purifying, and drying after the reaction to obtain hydrolyzed acrylic fiber; The mass ratio of acrylic fiber to sodium hydroxide aqueous solution is 20:(175-195), and the reaction conditions are to react for 4-8 minutes at a set temperature, wherein the set temperature is 70-90° C.; Step 2: adding the hydrolyzed acrylic fiber into N,N-dimethylformamide, and after dissolving, adding thionyl chloride dropwise, reacting after the addition is complete, purifying, and drying to obtain chlorinated acrylic fiber; The mass ratio of the hydrolyzed acrylic fiber, N,N-dimethylformamide, and thionyl chloride is 100:(400-500):(10-15), and the reaction conditions are 40-60° C. for 1-3 hours; Step 3: adding chlorinated acrylic fiber to N,N-dimethylformamide, and after dissolving, adding polyaminopropyl biguanide and triethylamine to react, and after the reaction is completed, purifying and drying to obtain polyaminopropyl biguanide grafted modified acrylic fiber; The mass ratio of chlorinated acrylic fiber, polyaminopropyl biguanide, triethylamine and N,N-dimethylformamide is (105-110):(10-15):(5-10):(450-550), and the reaction conditions are in an inert gas atmosphere at a temperature of 50-70° C. for 20-30 hours; Step 4: adding polyaminopropyl biguanide grafted modified acrylic fiber into N,N-dimethylformamide, and after dissolving, adding methyl iodide to react, and after the reaction is completed, purifying and drying to obtain modified acrylic fiber; The mass ratio of polyaminopropyl biguanide grafted modified acrylic fiber, methyl iodide, and N,N-dimethylformamide is (115-125):(5-10):(400-500), and the reaction conditions are 75-85° C. for 8-12 hours; Step 5: blending the modified acrylic fiber with the cotton fiber to obtain a blended yarn, and spinning the blended yarn into a fabric through a knitting process to obtain an inner layer fabric; Step 6: Use pure cotton fiber knitted fabric as the outer fabric, lay filling fiber between the inner fabric and the outer fabric, and sew them to obtain anti-pilling warm fiber fabric.

2. The method for preparing an anti-pilling thermal insulation fiber fabric according to claim 1, characterized in that: In the step 5, the mass ratio of modified acrylic fiber to cotton fiber is 1:1, the yarn count is 30-40S, and the weight of the inner layer fabric is 80-100g / m 2 .

3. The method for preparing the anti-pilling thermal insulation fiber fabric according to claim 1, characterized in that: In step 6, the pure cotton fiber knitted fabric is spun from pure cotton yarn through a knitting process, and the weight of the pure cotton fiber knitted fabric is 100-120 g / m 2 .

4. The method for preparing the anti-pilling thermal insulation fiber fabric according to claim 1, characterized in that: In step 6, the filling amount of the filling fiber is 60-80g / m 2 , the filling fiber includes polyester fiber.

5. The method for preparing the anti-pilling thermal insulation fiber fabric according to claim 1, characterized in that: In the step six, pure cotton sewing thread is used for sewing.

6. An anti-pilling thermal insulation fiber fabric prepared by the method for preparing an anti-pilling thermal insulation fiber fabric as claimed in any one of claims 1 to 5.

Images