High-elasticity wrinkled fabric resistant to high-temperature ironing and preparation process of high-elasticity wrinkled fabric

Abstract

The invention discloses a high-temperature-ironing-resistant high-elasticity wrinkled fabric and a preparation process thereof, belongs to the technical field of wrinkled fabric processing, and aims to solve the technical problem that the ironing resistance and the elasticity recovery performance of the wrinkled fabric need to be further improved in the prior art. The fabric comprises two sub-fabric layers and a bonding layer which is located between the two sub-fabric layers and is formed by bonding sheets, and modified polyamide is prepared by using modified polyether amine as a modification reinforcing agent to reinforce and modify polyamide. Modified polypropylene and isocyanate propyl triethoxy silane which are cross-linked and embedded by modified polysiloxane are matched with each other to reinforce modified polyamide, and a bonding sheet is prepared to bond the sub-fabric layer, so that the elastic recovery performance and the ironing-resistant size stability of the wrinkled fabric are effectively enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of wrinkle fabric processing, and in particular to a high-elasticity wrinkle fabric resistant to high-temperature ironing and a preparation process thereof. Background Art

[0002] In the field of clothing manufacturing, pleated fabrics are favored by consumers for their unique visual effects and comfortable wearing experience. By splicing pleated fabrics with plain fabrics, it is possible to design clothing that has a three-dimensional and layered feel, as well as comfort and fashion.

[0003] Prior art, the invention patent with publication number CN115972744A discloses a preparation process of elastic wrinkled fabric, which comprises preparing a prefabricated shrink film, a porous foam shrink film and a heat shrink fabric in sequence, adding the heat shrink fabric to an oven at a temperature of 70-90°C for heat preservation, then adding the heat shrink fabric to a wrinkling machine for wrinkling by kneading and wrinkling, washing with water to retain a moisture content of 8-15wt%, sending the wrinkled fabric to a setting machine preheated to 120-160°C for shaping, clamping the shaped fabric in a mold, preheating the wrinkling machine to a temperature of 180-200°C, adding the wrinkled fabric to a roller coating printing machine, and printing on the surface of the treated fabric by roller transfer printing to obtain the elastic wrinkled fabric, wherein the wrinkled effect is produced on the fabric by heat shrinking treatment, not only the surface will form a fancy wrinkled texture, but also the wrinkled fabric has a strong water washing resistance, and the wrinkled style is still maintained after washing, thereby improving the quality of the wrinkled fabric.

[0004] However, when pleated fabrics are combined with plain fabrics in a spliced ​​form to design clothing, the clothing usually needs to be ironed in order to deal with the wrinkles in the non-designed parts of the clothing during use. The joints between pleated fabrics and plain fabrics are often narrow. During the ironing process, the iron will inevitably come into contact with the pleated fabric part. Traditional pleated fabrics shrink or deform in a high temperature environment, causing the clothing to lose its original design sense. The pleated fabric has poor ironing resistance. In addition, the elastic recovery performance of traditional pleated fabrics is poor. After being pulled, the pleated parts are easily deformed, and the pleated fabrics are difficult to restore to their original wrinkled state.

[0005] In view of the technical defects in this aspect, a solution is now proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a high-elastic pleated fabric resistant to high-temperature ironing and a preparation process thereof, so as to solve the technical problem in the prior art that the ironing resistance and elastic recovery performance of the pleated fabric need to be further improved.

[0007] The object of the present invention can be achieved by the following technical scheme: A high-elastic wrinkle fabric resistant to high-temperature ironing, comprising two sub-fabric layers and an adhesive layer constructed by an adhesive sheet located between the two sub-fabric layers;

[0008] The adhesive sheet is obtained by the following steps:

[0009] A1. Add modified polyetheramine, caprolactam and deionized water into a nitrogen-protected autoclave and stir. Raise the autoclave temperature to 240-250°C, raise the autoclave pressure to 0.3-0.5MPa, and keep the reaction for 3-5h. Reduce the autoclave pressure to normal pressure, and continue to keep the reaction for 6-8h. Discharge, cool, and grind to obtain modified polyamide.

[0010] The synthetic reaction mechanism of modified polyamide is:

[0011] Under high temperature and high pressure conditions, caprolactam undergoes ring-opening polymerization to form polycaprolactam chain segments, and the amino functional groups on the modified polyetheramine molecules react with the carbonyl groups on the polycaprolactam chain segments to form amide bonds, thereby introducing the polyetheramine chain segments into the polyamide molecules to prepare modified polyamides having modified polyetheramine block-modified polycaprolactam.

[0012] A2, adding the modified polyamide and the additive to the torque rheometer for internal kneading, and after melting, adding the modified polypropylene and isocyanatepropyltriethoxysilane to the torque rheometer in sequence, kneading for 20-30 minutes, taking out, and pressing into a composite polyamide sheet with a thickness of 0.8-1.0 mm;

[0013] A3. The composite polyamide sheet is subjected to heat stretching to obtain a bonding sheet.

[0014] Furthermore, the sub-fabric is selected from any one of Lycra fabric and stretch cotton fabric.

[0015] Furthermore, in step A1, the weight ratio of the modified polyetheramine, caprolactam and deionized water is 10-15:40-50:2-3; in step A2, the weight ratio of the modified polyamide, modified polypropylene, isocyanatepropyltriethoxysilane and additive is 20:7-9:1.2-1.6:0.5-0.8, the additive is composed of a dispersant, an antioxidant and a plasticizer in a weight ratio of 2:1:5, the dispersant is a stearate, the antioxidant is one or more of antioxidant 1010, antioxidant 1076 and antioxidant 168, the plasticizer is a phthalate, the temperature of the torque rheometer is 270-280°C, and the rotation speed is 60-70r / min; in step A3, the hot stretching temperature is 220-240°C, the transverse stretching ratio is 4-6 times, and the longitudinal stretching ratio is 5-7 times.

[0016] Furthermore, the preparation method of the modified polyetheramine is as follows: polyetheramine, aminoethylaminopropyl polydimethylsiloxane, itaconic acid and 1,4-hydroquinone are added to a nitrogen-protected reactor and stirred, the temperature of the reactor is increased to 180-200°C, the reaction is kept warm for 3-5 hours, and the modified polyetheramine is obtained by cooling and discharging.

[0017] The synthetic reaction formula of modified polyetheramine is:

[0018]

[0019] Where:

[0020] The synthetic reaction mechanism of modified polyetheramine is:

[0021] In the reaction system, 1,4-hydroquinone is used as a free radical scavenger to prevent itaconic acid from self-polymerization. During the reaction, the lone pair of electrons on the amino group on the polyetheramine or aminoethylaminopropyl polydimethylsiloxane molecule attacks the double bond carbon atom on the itaconic acid molecule with nucleophilicity to generate an enolate intermediate. The itaconic acid is protonated to generate a new saturated carbonyl compound, and then an amide condensation reaction occurs under high temperature. The amides are chain extended through the condensation reaction, and finally a modified polyetheramine with itaconic acid and polysiloxane blocks having a pyrrolidone five-membered ring structure is formed.

[0022] Furthermore, the weight ratio of the polyetheramine, aminoethylaminopropyl polydimethylsiloxane, itaconic acid and 1,4-hydroquinone is 20-25:10-12:10-13:2.

[0023] Furthermore, the preparation method of modified polypropylene is: adding polypropylene powder and xylene into a reactor and stirring, raising the temperature of the reactor to 60-70°C, stirring for 2-3 hours, adding a modifier and an initiator into the reactor, raising the temperature of the reactor to 80-90°C, keeping the reaction temperature for 6-8 hours, and post-treating to obtain modified polypropylene.

[0024] The synthetic reaction mechanism of modified polypropylene is:

[0025] The surface activity of polypropylene is improved by soaking it in a xylene solution to make it swell. The initiator is decomposed under the action of high temperature to generate free radicals. The active sites on the polypropylene molecular chain and the unsaturated double bonds on the modifier molecules form free radicals on the modifier molecules and the polypropylene molecular chains. Under high temperature environment, the free radicals copolymerize and the modifier is intercalated with the polypropylene molecular chain in the form of molecular chain cross-linking to prepare modified polypropylene.

[0026] Furthermore, the amount ratio of the polypropylene powder, xylene, modifier modified polysiloxane, 1,2-epoxy-5-hexene and initiator is 20g:200mL:3-4g:0.1g, the modifier is composed of modified polysiloxane and 1,2-epoxy-5-hexene in a weight ratio of 2:1, the initiator is benzoyl peroxide, and the post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, filtered, and the filter cake is extracted with ethyl acetate for 20 hours to obtain modified polypropylene.

[0027] Further, the modified polysiloxane is processed by the following steps:

[0028] B1, aminopropylmethyldiethoxysilane, octamethylsilicone oil and tetrahydrofuran are added to a reaction kettle and stirred, the temperature of the reaction kettle is increased to 55-65° C., potassium hydroxide solution is added to the reaction kettle, and the reaction is kept warm for 10-12 hours, and post-processed to obtain polysiloxane;

[0029] B2. Add polysiloxane and toluene into a nitrogen-protected reactor and stir. The temperature of the reactor is raised to 60-70° C. 3-isocyanate propylene solution is added dropwise into the reactor. After the addition is complete, the mixture is stirred at the temperature for 4-6 hours and post-processed to obtain modified polysiloxane.

[0030] The synthetic reaction formula of modified polysiloxane is:

[0031]

[0032] The synthetic reaction mechanism of modified polysiloxane is:

[0033] After aminopropylmethyldiethoxysilane and octamethylsilicone oil are uniformly mixed in tetrahydrofuran, potassium hydroxide is used as an alkaline catalyst to promote the hydrolysis and condensation reaction of the ethoxy groups of silane to generate polysiloxane with an amino-modified polysiloxane skeleton structure;

[0034] Under nitrogen protection, the amino group on the polysiloxane molecule undergoes a condensation reaction with the isocyanate group on the 3-isocyanate propylene molecule to generate a urea bond, and a large number of olefin double bonds are modified on the polysiloxane molecular chain to prepare a modified polysiloxane.

[0035] Further, in step B1, the amount ratio of aminopropylmethyldiethoxysilane, octamethylsilicone oil, tetrahydrofuran and potassium hydroxide solution is 1g:5-8g:40mL:8mL, the concentration of potassium hydroxide is 0.6-1.2mol / L, and the post-treatment includes: after the reaction is completed, the reactor is kept at 55-65°C, the solvent is evaporated, the temperature of the reactor is lowered to room temperature, purified water and chloroform are added to the reactor, stirred at room temperature for 10-15min, allowed to stand for separation, and the organic The phase was washed three times with purified water and then transferred to a rotary evaporator with a water bath temperature of 40-50°C, and the solvent was distilled off under reduced pressure to obtain polysiloxane; in step B2, the amount ratio of the polysiloxane, toluene and 3-isocyanate propylene solution was 7g:40mL:1g, and the 3-isocyanate propylene solution was composed of 3-isocyanate propylene and toluene in a weight ratio of 2:3. The post-treatment included: after the reaction was completed, the temperature of the reactor was increased to 80°C, and the low-boiling liquid was distilled off under reduced pressure to obtain modified polysiloxane.

[0036] The present invention also provides a preparation process of a high-elastic wrinkled fabric resistant to high-temperature ironing, comprising the following steps:

[0037] S1. After wetting the sub-fabric layers, an adhesive sheet is placed between the two sub-fabric layers, and then heat-treated at a temperature of 270-280° C. for 60-100 seconds to obtain a composite fabric;

[0038] S2, placing the composite fabric into a wrinkling machine at a temperature of 190-210° C. to wrinkle the composite fabric by kneading and pressing to obtain a rough wrinkled fabric product;

[0039] S3. Place the rough wrinkled fabric in a setting machine at a temperature of 170-190° C. and heat-set for 8-12 minutes to obtain the wrinkled fabric.

[0040] The present invention has the following beneficial effects:

[0041] 1. The high-elasticity wrinkled fabric resistant to high-temperature ironing of the present invention is prepared by reinforcing and modifying polyamide with modified polyetheramine as a modifying and reinforcing agent to prepare modified polyamide, reinforcing and modifying polypropylene with modified polysiloxane to prepare modified polypropylene, and then reinforcing the modified polyamide with modified polypropylene and isocyanatepropyltriethoxysilane to prepare an adhesive sheet. The modified polypropylene and modified polyamide have high elastic recovery ability, which helps to reduce the sudden elastic deformation rate and slow elastic deformation rate of the fabric. By modifying polyamide and polypropylene, the thermal stability of the molecular chain segments of the modified polyamide and modified polypropylene is improved, which helps to improve the heat resistance of the material and reduce the dimensional change after ironing. In addition, isocyanatepropyltriethoxysilane is introduced into the material as a cross-linking agent, which can increase the cross-linking degree between molecules, further restrict the movement of molecular chains, and improve the ironing resistance of the fabric.

[0042] 2. The high-elasticity wrinkled fabric resistant to high-temperature ironing of the present invention uses polyetheramine with good flexibility and elasticity and aminoethylaminopropyl polydimethylsiloxane with good flexibility as raw materials, and uses itaconic acid as a dibasic acid to promote the reaction of polyetheramine and aminoethylaminopropyl polydimethylsiloxane to form amide bonds, thereby increasing the crosslinking degree and cohesive force of the molecular chain. The flexibility of the polyetheramine and polysiloxane chain segments makes the modified polyamide molecular chain more likely to deform when subjected to force, and can quickly restore the original shape after the external force is removed, thereby improving the elastic recovery performance of the fabric. The pyrrolidone five-membered ring structure formed by the itaconic acid unit increases the crosslinking degree and cohesive force of the molecular chain, which helps the fabric to maintain a stable shape when subjected to force and reduce permanent deformation. The polycaprolactam segment has good heat resistance and provides the material with good thermal stability, thereby making the modified polyamide less likely to be thermally degraded or deformed during ironing. At the same time, the amide bonds and crosslinking structures formed by the itaconic acid unit help to increase the rigidity of the molecular chain and reduce thermal motion during ironing, thereby further improving the ironing resistance of the fabric.

[0043] 3. The high-elastic wrinkle fabric resistant to high-temperature ironing of the present invention is prepared by preparing a modified polysiloxane containing a polyolefin double bond to strengthen the polypropylene, so that the modified polysiloxane molecular chain segment and the polypropylene molecular chain segment form a cross-linked structure, which enhances the interaction force between the molecular chains, so that the material maintains a stable shape after deformation and improves the elastic recovery rate. In addition, the polysiloxane segment has high thermal stability and can maintain a stable structure during the ironing process, so that the fabric can better resist deformation under high temperature during ironing, thereby improving the ironing resistance. When preparing the adhesive sheet, the epoxy group on the modified polypropylene molecular chain can react with isocyanate propylene to form a cross-linked structure. The isocyanate group on the triethoxysilane molecule can form a cross-linking bond with the imine group on the modified polyamide molecular chain, thereby increasing the intermolecular cross-linking degree of the adhesive sheet. At the same time, triethoxysilane is introduced into the adhesive sheet molecule, and the modified polypropylene and the modified polyamide are bonded to form a more complex cross-linking network, which further improves the elastic recovery performance of the fabric. With the adhesive sheet as the bonding layer, in a high temperature and high humidity environment, the siloxane bonds in the adhesive sheet are hydrolyzed and condensed, and after heat setting, the intermolecular cross-linking degree is further increased, while the bonding strength between the sub-fabric layers is increased, thereby improving the elastic recovery performance of the material and the dimensional stability after ironing. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1It is the infrared spectrum of the modified polyetheramine in the present invention. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. 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 creative work are within the scope of protection of the present invention.

[0047] The aminoethylaminopropyl polydimethylsiloxane in this application is selected from Guangzhou Qixu Chemical Co., Ltd., product name: bis-amino-terminated propyl silicone oil CM-226, density: 0.98g / mLat25°C;

[0048] The polyetheramine in this application is selected from Jinan Linyan Mandy New Materials Co., Ltd., product name: polyetheramine model D400, density: 32kg / m 3 ;

[0049] The polypropylene powder in this application is selected from Dongguan Taotao Plastic Raw Materials Co., Ltd., model PP-T108.

[0050] Example 1

[0051] This embodiment provides a preparation process of an adhesive sheet for high-elastic wrinkled fabrics resistant to high temperature ironing, comprising the following steps:

[0052] S1. Preparation of modified polyamide

[0053] Weigh: 200 g of polyetheramine, 100 g of aminoethylaminopropyl polydimethylsiloxane, 100 g of itaconic acid and 20 g of 1,4-hydroquinone, add into a nitrogen-protected reactor and stir, raise the temperature of the reactor to 180°C, keep the temperature for 3 hours, cool and discharge to obtain modified polyetheramine;

[0054] Weigh: 100 g of modified polyether amine, 400 g of caprolactam, and 20 g of deionized water, add into a nitrogen-protected autoclave and stir, raise the temperature of the autoclave to 240°C, raise the pressure of the autoclave to 0.3 MPa, keep warm for 3 hours, reduce the pressure of the autoclave to normal pressure, continue to keep warm for 6 hours, discharge, cool, and grind to obtain modified polyamide.

[0055] S2. Preparation of modified polysiloxane

[0056] Weigh: 100 g of aminopropylmethyldiethoxysilane, 500 g of octamethylsilicone oil, and 4000 mL of tetrahydrofuran, add them to a reactor and stir, raise the temperature of the reactor to 55° C., add 800 mL of 0.6 mol / L potassium hydroxide solution to the reactor, keep the reaction for 10 h, keep the reactor at 55° C., evaporate the solvent, lower the temperature of the reactor to room temperature, add 1000 mL of purified water and 3000 mL of chloroform to the reactor, stir at room temperature for 10 min, stand and separate, wash the organic phase with purified water 3 times, transfer it to a rotary evaporator with a water bath temperature of 40° C., evaporate the solvent under reduced pressure to obtain polysiloxane;

[0057] Mix 3-isocyanate propylene and toluene in a weight ratio of 2:3 to obtain a 3-isocyanate propylene solution;

[0058] Weigh: 700 g of polysiloxane and 4000 mL of toluene are added to a nitrogen-protected reactor and stirred. The temperature of the reactor is raised to 60°C. 100 g of 3-isocyanate propylene solution is added dropwise to the reactor. After the addition is complete, the mixture is stirred for 4 hours at the temperature maintained. The temperature of the reactor is raised to 80°C. The low-boiling liquid is evaporated under reduced pressure to obtain modified polysiloxane.

[0059] S3. Preparation of modified polypropylene

[0060] The modified polysiloxane and 1,2-epoxy-5-hexene are uniformly mixed in a weight ratio of 2:1 to obtain a modifier;

[0061] Weigh: 200 g of polypropylene powder and 2 L of xylene, add into the reactor and stir, raise the temperature of the reactor to 60°C, stir for 2 h, add 30 g of modifier and 1 g of benzoyl peroxide into the reactor, raise the temperature of the reactor to 80°C, keep warm for 6 h, lower the temperature of the reactor to room temperature, filter, extract the filter cake with ethyl acetate for 20 h to obtain modified polypropylene.

[0062] S4. Preparation of bonding sheet

[0063] Calcium stearate, antioxidant 1010 and diisobutyl phthalate are uniformly mixed in a weight ratio of 2:1:5 to obtain an additive;

[0064] Weigh: 200g of modified polyamide and 5g of additive are added to a torque rheometer at a temperature of 270°C and a rotation speed of 60r / min for internal kneading. After melting, 70g of modified polypropylene and 12g of triethoxypropyl isocyanate silane are added to the torque rheometer in sequence, and the mixture is internally kneaded for 20min. The mixture is taken out and pressed into a composite polyamide sheet with a thickness of 0.8mm.

[0065] The composite polyamide sheet was firstly longitudinally stretched at a stretching ratio of 5 times and then transversely stretched at a stretching ratio of 4 times at a temperature of 220° C., and then cut to obtain a bonding sheet.

[0066] Example 2

[0067] This embodiment provides a preparation process of an adhesive sheet for high-elastic wrinkled fabrics resistant to high temperature ironing, comprising the following steps:

[0068] S1. Preparation of modified polyamide

[0069] Weigh: 225 g of polyetheramine, 110 g of aminoethylaminopropyl polydimethylsiloxane, 115 g of itaconic acid and 20 g of 1,4-hydroquinone, add into a nitrogen-protected reactor and stir, raise the temperature of the reactor to 190°C, keep the temperature for 4 hours, cool and discharge to obtain modified polyetheramine;

[0070] Weigh: 125g of modified polyetheramine, 450g of caprolactam, and 25g of deionized water, add into a nitrogen-protected autoclave and stir, raise the temperature of the autoclave to 245°C, raise the pressure of the autoclave to 0.4MPa, keep warm for 4h, reduce the pressure of the autoclave to normal pressure, continue to keep warm for 7h, discharge, cool, and grind to obtain modified polyamide.

[0071] S2. Preparation of modified polysiloxane

[0072] Weigh: 100 g of aminopropylmethyldiethoxysilane, 650 g of octamethylsilicone oil, and 4000 mL of tetrahydrofuran, add them to a reactor and stir, raise the temperature of the reactor to 60° C., add 800 mL of 1.0 mol / L potassium hydroxide solution to the reactor, keep the reaction for 11 h, keep the reactor at 60° C., evaporate the solvent, lower the temperature of the reactor to room temperature, add 1000 mL of purified water and 3000 mL of chloroform to the reactor, stir at room temperature for 13 min, stand and separate, wash the organic phase with purified water 3 times, transfer it to a rotary evaporator with a water bath temperature of 45° C., evaporate the solvent under reduced pressure to obtain polysiloxane;

[0073] Mix 3-isocyanate propylene and toluene in a weight ratio of 2:3 to obtain a 3-isocyanate propylene solution;

[0074] Weigh: 700 g of polysiloxane and 4000 mL of toluene are added to a nitrogen-protected reactor and stirred. The temperature of the reactor is raised to 65°C. 100 g of 3-isocyanate propylene solution is added dropwise to the reactor. After the addition is complete, the mixture is stirred for 5 hours at a temperature of 80°C. The low-boiling liquid is evaporated under reduced pressure to obtain modified polysiloxane.

[0075] S3. Preparation of modified polypropylene

[0076] The modified polysiloxane and 1,2-epoxy-5-hexene are uniformly mixed in a weight ratio of 2:1 to obtain a modifier;

[0077] Weigh: 200 g of polypropylene powder and 2 L of xylene, add into the reactor and stir, raise the temperature of the reactor to 65°C, stir for 2.5 h, add 35 g of modifier and 1 g of benzoyl peroxide into the reactor, raise the temperature of the reactor to 85°C, keep warm for 7 h, lower the temperature of the reactor to room temperature, filter, extract the filter cake with ethyl acetate for 20 h to obtain modified polypropylene.

[0078] S4. Preparation of bonding sheet

[0079] Mix zinc stearate, antioxidant 1076 and dimethyl phthalate in a weight ratio of 2:1:5 to obtain an additive;

[0080] Weigh: 200g of modified polyamide and 7g of additive are added to a torque rheometer at a temperature of 275°C and a speed of 65r / min for internal kneading. After melting, 80g of modified polypropylene and 14g of triethoxypropyl isocyanate silane are added to the torque rheometer in sequence, and internal kneaded for 25min. The resultant is taken out and pressed into a composite polyamide sheet with a thickness of 0.9mm.

[0081] The composite polyamide sheet was firstly longitudinally stretched at a stretching ratio of 6 times and then transversely stretched at a stretching ratio of 5 times at a temperature of 230° C., and then cut to obtain an adhesive sheet.

[0082] Example 3

[0083] This embodiment provides a preparation process of an adhesive sheet for high-elastic wrinkled fabrics resistant to high temperature ironing, comprising the following steps:

[0084] S1. Preparation of modified polyamide

[0085] Weigh: 250 g of polyetheramine, 120 g of aminoethylaminopropyl polydimethylsiloxane, 130 g of itaconic acid and 20 g of 1,4-hydroquinone, add into a nitrogen-protected reactor and stir, raise the temperature of the reactor to 200°C, keep the temperature for 5 hours, cool and discharge to obtain modified polyetheramine;

[0086] Weigh: 150g of modified polyetheramine, 500g of caprolactam, and 30g of deionized water, add into a nitrogen-protected autoclave and stir, increase the temperature of the autoclave to 250°C, increase the pressure of the autoclave to 0.5MPa, keep warm for 5h, reduce the pressure of the autoclave to normal pressure, continue to keep warm for 8h, discharge, cool, and grind to obtain modified polyamide.

[0087] S2. Preparation of modified polysiloxane

[0088] Weigh: 100 g of aminopropylmethyldiethoxysilane, 800 g of octamethylsilicone oil, and 4000 mL of tetrahydrofuran, add them to a reactor and stir, raise the temperature of the reactor to 65° C., add 800 mL of 1.2 mol / L potassium hydroxide solution to the reactor, keep the reaction for 12 h, keep the reactor at 65° C., evaporate the solvent, lower the temperature of the reactor to room temperature, add 1000 mL of purified water and 3000 mL of chloroform to the reactor, stir at room temperature for 15 min, stand and separate, wash the organic phase with purified water 3 times, transfer it to a rotary evaporator with a water bath temperature of 50° C., evaporate the solvent under reduced pressure to obtain polysiloxane;

[0089] Mix 3-isocyanate propylene and toluene in a weight ratio of 2:3 to obtain a 3-isocyanate propylene solution;

[0090] Weigh: 700 g of polysiloxane and 4000 mL of toluene are added to a nitrogen-protected reactor and stirred. The temperature of the reactor is raised to 70°C. 100 g of 3-isocyanate propylene solution is added dropwise to the reactor. After the addition is complete, the mixture is stirred for 6 hours at a constant temperature. The temperature of the reactor is raised to 80°C. The low-boiling liquid is evaporated under reduced pressure to obtain modified polysiloxane.

[0091] S3. Preparation of modified polypropylene

[0092] The modified polysiloxane and 1,2-epoxy-5-hexene are uniformly mixed in a weight ratio of 2:1 to obtain a modifier;

[0093] Weigh: 200 g of polypropylene powder and 2 L of xylene, add into the reactor and stir, raise the temperature of the reactor to 70°C, stir for 3 h, add 40 g of modifier and 1 g of benzoyl peroxide into the reactor, raise the temperature of the reactor to 90°C, keep warm for 8 h, lower the temperature of the reactor to room temperature, filter, extract the filter cake with ethyl acetate for 20 h to obtain modified polypropylene.

[0094] S4. Preparation of bonding sheet

[0095] Mix barium stearate, antioxidant 168 and dibutyl phthalate in a weight ratio of 2:1:5 to obtain an additive;

[0096] Weigh: 200g of modified polyamide and 8g of additive are added to a torque rheometer at a temperature of 280°C and a rotation speed of 70r / min for internal kneading. After melting, 90g of modified polypropylene and 16g of triethoxypropyl isocyanate silane are added to the torque rheometer in sequence, and the mixture is internally kneaded for 30min. The mixture is taken out and pressed into a composite polyamide sheet with a thickness of 1.0mm.

[0097] The composite polyamide sheet was firstly longitudinally stretched at a stretching ratio of 7 times and then transversely stretched at a stretching ratio of 6 times at a temperature of 240° C., and then cut to obtain a bonding sheet.

[0098] Example 4

[0099] This embodiment provides a preparation process of a high-elastic wrinkled fabric that is resistant to high-temperature ironing, comprising the following steps:

[0100] Step 1: Select Lycra fabric as the sub-fabric, wet the sub-fabric layer, place the adhesive sheet prepared in Example 1 between the two sub-fabric layers, and then hot-press them at a temperature of 270° C. and a pressure of 0.5 MPa for 60 seconds to obtain a composite fabric;

[0101] Step 2: placing the composite fabric into a wrinkling machine at a temperature of 190° C. to wrinkle the composite fabric by kneading and pressing to obtain a rough wrinkled fabric product;

[0102] Step 3: Place the rough pleated fabric into a setting machine at a temperature of 170° C. and heat-set it for 8 minutes to obtain the pleated fabric.

[0103] Example 5

[0104] This embodiment provides a preparation process of a high-elastic wrinkled fabric that is resistant to high-temperature ironing, comprising the following steps:

[0105] Step 1: Select stretch cotton fabric as sub-fabric, wet the sub-fabric layer, place the adhesive sheet prepared in Example 2 between the two sub-fabric layers, and then hot-press them at a temperature of 275° C. and a pressure of 0.65 MPa for 80 seconds to obtain a composite fabric;

[0106] Step 2: placing the composite fabric into a wrinkling machine at a temperature of 200° C. to wrinkle the composite fabric by kneading and pressing to obtain a rough wrinkled fabric product;

[0107] Step 3: Place the rough pleated fabric into a setting machine at a temperature of 180° C. and heat-set it for 10 minutes to obtain the pleated fabric.

[0108] Example 6

[0109] This embodiment provides a preparation process of a high-elastic wrinkled fabric that is resistant to high-temperature ironing, comprising the following steps:

[0110] Step 1: Select Lycra fabric as the sub-fabric, wet the sub-fabric layer, place the adhesive sheet prepared in Example 3 between the two sub-fabric layers, and then hot-press them at a temperature of 280° C. and a pressure of 0.8 MPa for 100 seconds to obtain a composite fabric;

[0111] Step 2: placing the composite fabric into a wrinkling machine at a temperature of 210° C. to wrinkle the composite fabric by kneading and pressing to obtain a rough wrinkled fabric product;

[0112] Step 3: Place the rough pleated fabric into a setting machine at a temperature of 190° C. and heat-set it for 12 minutes to obtain the pleated fabric.

[0113] Comparative Example 1

[0114] The difference between this comparative example and Example 6 is that the adhesive sheet prepared in Example 3 is used, aminoethylaminopropyl polydimethylsiloxane is not added in the process of preparing the modified polyetheramine in step S1, and the amount of itaconic acid is reduced simultaneously.

[0115] Comparative Example 2

[0116] The difference between this comparative example and Example 6 is that the adhesive sheet prepared in Example 3 is used, and in step S2, hydroxy silicone oil is used instead of polysiloxane in the process of preparing modified polysiloxane.

[0117] Comparative Example 3

[0118] The difference between this comparative example and Example 6 is that the adhesive sheet prepared in Example 3 is used, and in step S4, no isocyanatepropyltriethoxysilane is added during the preparation of the composite polyamide sheet.

[0119] Performance Test:

[0120] The rapid elastic deformation rate and slow elastic deformation rate of the wrinkled fabrics prepared in Examples 4-6 and Comparative Examples 1-3 were measured with reference to the standard GB / T 28188-2011 "Determination of the resilience of horsetail lining fabrics for textiles - Ring hanging weight method";

[0121] The dimensional change rate of the wrinkled fabrics prepared in Examples 4-6 and Comparative Examples 1-3 after ironing was tested with reference to the standard GB / T 38006-2019 "Test method for dimensional change of textile fabrics after steam ironing". The specific test results are shown in Table 1 below:

[0122] Table 1-Performance test data of samples

[0123]

[0124] Data Analysis:

[0125] A comparative analysis of the data in Table 1 above shows that the sudden elastic deformation rate of the wrinkled fabric sample prepared by the present invention reaches 96.3%, and the slow elastic deformation rate reaches 98.8%. After ironing, the dimensional change rate of the sample in the width direction is reduced to 0.7%, and the dimensional change rate in the length direction is reduced to 1.1%. All performance parameters are better than those of the comparative example, indicating that the present invention uses modified polyether amine as a modifying and reinforcing agent to enhance and modify polyamide to prepare modified polyamide, and uses modified polypropylene cross-linked with modified polysiloxane and isocyanatepropyltriethoxysilane to cooperate with each other to enhance the modified polyamide, and prepares an adhesive sheet to bond the sub-fabric layer, thereby effectively enhancing the elastic recovery performance and ironing-resistant dimensional stability of the wrinkled fabric.

[0126] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0127] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0128] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-elastic pleated fabric resistant to high-temperature ironing, characterized in that: It comprises two sub-fabric layers and an adhesive layer constructed by an adhesive sheet and located between the two sub-fabric layers; The adhesive sheet is obtained by the following steps: A1. Add modified polyetheramine, caprolactam and deionized water into a nitrogen-protected autoclave and stir. Raise the autoclave temperature to 240-250°C, raise the autoclave pressure to 0.3-0.5MPa, and keep the reaction for 3-5h. Reduce the autoclave pressure to normal pressure, and continue to keep the reaction for 6-8h. Discharge, cool, and grind to obtain modified polyamide. A2, adding the modified polyamide and the additive to the torque rheometer for internal kneading, and after melting, adding the modified polypropylene and isocyanatepropyltriethoxysilane to the torque rheometer in sequence, kneading for 20-30 minutes, taking out, and pressing into a composite polyamide sheet with a thickness of 0.8-1.0 mm; A3. The composite polyamide sheet is subjected to heat stretching to obtain a bonding sheet.

2. The high-elastic pleated fabric resistant to high temperature ironing according to claim 1, characterized in that: The sub-fabric is selected from any one of Lycra fabric and stretch cotton fabric.

3. The high-elastic pleated fabric resistant to high temperature ironing according to claim 1, characterized in that: In step A1, the weight ratio of the modified polyetheramine, caprolactam and deionized water is 10-15:40-50:2-3; in step A2, the weight ratio of the modified polyamide, modified polypropylene, isocyanatepropyl triethoxysilane and additive is 20:7-9:1.2-1.6:0.5-0.8, the additive consists of a dispersant, an antioxidant and a plasticizer in a weight ratio of 2:1:5, the dispersant is a stearate, the antioxidant is one or more of antioxidant 1010, antioxidant 1076 and antioxidant 168, the plasticizer is a phthalate, the temperature of the torque rheometer is 270-280°C, and the rotation speed is 60-70r / min; in step A3, the hot stretching temperature is 220-240°C, the transverse stretching ratio is 4-6 times, and the longitudinal stretching ratio is 5-7 times.

4. The high-elastic pleated fabric resistant to high temperature ironing according to claim 1, characterized in that: The preparation method of the modified polyetheramine is as follows: polyetheramine, aminoethylaminopropyl polydimethylsiloxane, itaconic acid and 1,4-hydroquinone are added into a nitrogen-protected reactor and stirred, the temperature of the reactor is increased to 180-200°C, the reaction is kept warm for 3-5 hours, and the modified polyetheramine is obtained by cooling and discharging.

5. The high-elastic pleated fabric resistant to high temperature ironing according to claim 4, characterized in that: The weight ratio of the polyetheramine, aminoethylaminopropyl polydimethylsiloxane, itaconic acid and 1,4-hydroquinone is 20-25:10-12:10-13:

2.

6. The high-elastic pleated fabric resistant to high temperature ironing according to claim 1, characterized in that: The preparation method of modified polypropylene is as follows: polypropylene powder and xylene are added into a reactor and stirred, the temperature of the reactor is increased to 60-70°C, stirred for 2-3 hours, a modifier and an initiator are added into the reactor, the temperature of the reactor is increased to 80-90°C, the reaction is kept warm for 6-8 hours, and modified polypropylene is obtained by post-treatment.

7. The high-elastic pleated fabric resistant to high temperature ironing according to claim 6, characterized in that: The amount ratio of the polypropylene powder, xylene, modifier modified polysiloxane, 1,2-epoxy-5-hexene and initiator is 20g:200mL:3-4g:0.1g, the modifier is composed of modified polysiloxane and 1,2-epoxy-5-hexene in a weight ratio of 2:1, the initiator is benzoyl peroxide, and the post-treatment includes: after the reaction is completed, the temperature of the reactor is lowered to room temperature, the filter is filtered, and the filter cake is extracted with ethyl acetate for 20 hours to obtain modified polypropylene.

8. The high-elastic pleated fabric resistant to high temperature ironing according to claim 1, characterized in that: The modified polysiloxane is processed by the following steps: B1, aminopropylmethyldiethoxysilane, octamethylsilicone oil and tetrahydrofuran are added to a reaction kettle and stirred, the temperature of the reaction kettle is increased to 55-65° C., potassium hydroxide solution is added to the reaction kettle, and the reaction is kept warm for 10-12 hours, and post-processed to obtain polysiloxane; B2. Add polysiloxane and toluene into a nitrogen-protected reactor and stir. The temperature of the reactor is raised to 60-70° C. 3-isocyanate propylene solution is added dropwise into the reactor. After the addition is complete, the mixture is stirred at the temperature for 4-6 hours and post-processed to obtain modified polysiloxane.

9. The high-elastic pleated fabric resistant to high temperature ironing according to claim 8, characterized in that: In step B1, the amount ratio of aminopropylmethyldiethoxysilane, octamethylsilicone oil, tetrahydrofuran and potassium hydroxide solution is 1g:5-8g:40mL:8mL, the concentration of potassium hydroxide is 0.6-1.2mol / L, and the post-treatment comprises: after the reaction is completed, the reactor is kept at 55-65°C, the solvent is evaporated, the temperature of the reactor is lowered to room temperature, purified water and chloroform are added to the reactor, stirred at room temperature for 10-15min, allowed to stand for separation, and the organic phase is separated by filtration. After washing with purified water three times, the mixture is transferred to a rotary evaporator with a water bath temperature of 40-50°C, and the solvent is evaporated under reduced pressure to obtain polysiloxane; in step B2, the amount ratio of the polysiloxane, toluene and 3-isocyanate propylene solution is 7g:40mL:1g, and the 3-isocyanate propylene solution is composed of 3-isocyanate propylene and toluene in a weight ratio of 2:

3. The post-treatment includes: after the reaction is completed, the temperature of the reactor is increased to 80°C, and the low-boiling liquid is evaporated under reduced pressure to obtain modified polysiloxane.

10. The process for preparing a high-elastic wrinkled fabric resistant to high temperature ironing according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. After wetting the sub-fabric layers, an adhesive sheet is placed between the two sub-fabric layers, and then heat-treated at a temperature of 270-280° C. for 60-100 seconds to obtain a composite fabric; S2, placing the composite fabric into a wrinkling machine at a temperature of 190-210° C. to wrinkle the composite fabric by kneading and pressing to obtain a rough wrinkled fabric product; S3. Place the rough wrinkled fabric in a setting machine at a temperature of 170-190° C. and heat-set for 8-12 minutes to obtain the wrinkled fabric.

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