Anti-wrinkle polyamide fabric and production process thereof

Abstract

The invention discloses an anti-wrinkle polyamide fabric and a production process thereof, and belongs to the technical field of textile fabrics, and the production process comprises the following steps: S1, preparation of a padding finishing emulsion: adding deionized water into a modified anti-wrinkle finishing agent while stirring to form an emulsion, then adding a penetrant JFC, and continuously stirring and mixing to obtain the padding finishing emulsion; s2, preparation of an anti-wrinkle polyamide fabric: adding a polyamide fabric into the padding finishing emulsion, carrying out padding treatment, pre-drying at 80 DEG C for 3 min, baking at 120-130 DEG C for 3 min, washing with water, and drying to obtain the anti-wrinkle polyamide fabric, according to the invention, the padding finishing emulsion with good stability is introduced, so that the reaction inactivation of isocyanate groups and water is effectively avoided, the anti-wrinkle activity of the modified anti-wrinkle finishing agent is improved, and meanwhile, the polyamide fabric is endowed with good flexibility by introducing the modified organic silicon resin, so that the modified polyamide fabric can better maintain the original strength.

Description

Technical Field

[0001] The invention belongs to the technical field of textile fabrics, and in particular relates to an anti-wrinkle polyamide fabric and a production process thereof. Background Art

[0002] Polyamide fabrics are widely used in clothing, home textiles and other fields due to their excellent wear resistance and moisture absorption. However, polyamide fabric molecules contain a large number of amino groups, which are mainly connected by weak hydrogen bonds and van der Waals forces. When subjected to external forces, relative slippage is likely to occur between fiber molecules. This relative slippage causes the polar group amino groups to reconnect at a new position. After the external force is removed, there is not enough force between the molecules to restore them to their original positions, making polyamide fabrics prone to wrinkles.

[0003] In the prior art, when anti-wrinkle finishing is performed on polyamide fabrics, isocyanate anti-wrinkle finishing agents containing active groups are usually used to chemically covalently cross-link the polyamide fabrics to increase the interaction force between fiber molecules and improve the anti-wrinkle performance. However, the isocyanate group has a high activity and will react with water molecules to lose its activity when preparing the finishing liquid. In addition, multiple covalent cross-linking will also cause severe damage to the polyamide fabric due to stress concentration, limiting its application in the anti-wrinkle performance of polyamide fabrics. Therefore, how to effectively avoid the inactivation of isocyanate anti-wrinkle finishing agents by reaction with water and reduce the strength loss caused by cross-linking is a technical problem that needs to be solved at present. Summary of the invention

[0004] The object of the present invention is to provide a wrinkle-resistant polyamide fabric and a production process thereof to solve the problems in the background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A production process for wrinkle-resistant polyamide fabrics, comprising the following steps:

[0007] S1. Preparation of padding finishing emulsion:

[0008] Add deionized water to the modified anti-wrinkle finishing agent while stirring to form an emulsion, then add the penetrant JFC and continue stirring and mixing to obtain a padding finishing emulsion;

[0009] S2. Preparation of wrinkle-resistant polyamide fabric:

[0010] Add polyamide fabric to the padding finishing emulsion, perform double dipping and double padding, the liquid carrying rate is 80-90%, pre-bake at 80°C for 3 minutes, bake at 120-130°C for 3 minutes, and then wash and dry to obtain the wrinkle-resistant polyamide fabric.

[0011] Furthermore, in step S1, the volume ratio of the modified anti-wrinkle finishing agent, deionized water, and penetrant JFC is 50-60:500:2-3; and in step S2, the amount ratio of the padding finishing emulsion and the polyamide fabric is 400 mL:10-12 g.

[0012] Furthermore, the modified anti-wrinkle finishing agent is prepared by the following steps:

[0013] Under nitrogen protection, the modified silicone resin acetone solution is added dropwise to the 40-45° C. acetone solution of isophorone diisocyanate while stirring, and the dropping time is controlled to be 5-10 minutes. After the dropping is completed, the mixture is reacted at 50-55° C. for 2-3 hours, and then methyl ethyl ketone oxime is added to continue the reaction for 1-1.5 hours. After vacuum rotary evaporation, a modified anti-wrinkle finishing agent is obtained;

[0014] The modified silicone resin molecule contains epoxy groups. Isophorone diisocyanate is grafted onto the modified silicone resin molecule through a ring-opening reaction, and a highly active isocyanate group is introduced into the modified silicone resin molecule. Methyl ethyl ketone oxime is then used as a capping agent, and an oxime group reacts with an isocyanate group to form an oxime-carbamate bond. The oxime-carbamate bond, as a dynamic covalent bond, can cap the isophorone diisocyanate group at room temperature, and can dissociate under heating conditions to release the isocyanate group, thereby effectively avoiding the modified anti-wrinkle finishing agent from reacting with water molecules during the emulsification process and causing deactivation, thereby obtaining a reactive modified anti-wrinkle finishing agent capped with isocyanate groups that can be thermally deblocked.

[0015] Furthermore, the volume ratio of the acetone solution of isophorone diisocyanate, the acetone solution of the modified silicone resin, and methyl ethyl ketone oxime is 20:23:0.5-1; the concentration of the acetone solution of isophorone diisocyanate is 10.57-12.32wt%; the concentration of the acetone solution of the modified silicone resin is 8.92-13.4wt%;

[0016] Furthermore, the modified silicone resin is prepared by the following steps:

[0017] A1. Add tetramethyldisiloxane to the cyclotetrasiloxane mixture in a nitrogen atmosphere, stir evenly at 40-45° C., add concentrated sulfuric acid and stir at 50-60° C. for 4-5 hours, cool to room temperature, adjust the pH value to neutral with anhydrous sodium carbonate, remove excess concentrated sulfuric acid, filter and retain the liquid, and then distill under reduced pressure to obtain an intermediate;

[0018] A2. Add the intermediate and allyl glycidyl ether to toluene, mix well, add isopropyl chloroplatinic acid solution in isopropyl ketone, pre-react at 45-50°C for 30 minutes, then heat to 80-90°C, continue stirring to react for 1-3 hours, and then obtain modified silicone resin after rotary evaporation.

[0019] The invention uses a cyclotetrasiloxane mixture as a reaction raw material and tetramethyldisiloxane as a capping agent, performs ring-opening copolymerization under the catalytic action of concentrated sulfuric acid to obtain an organic silicone resin intermediate containing hydrogen at both ends and a side chain, and then performs addition reaction with the carbon-carbon double bond of allyl glycidyl ether through a silicon-hydrogen bond under the catalytic action of chloroplatinic acid to obtain a modified organic silicone resin containing epoxy ether bonds at both ends and a side chain.

[0020] Furthermore, the volume ratio of the cyclotetrasiloxane mixture, tetramethyldisiloxane and concentrated sulfuric acid is 10-15:1-2:0.5.

[0021] Furthermore, the cyclotetrasiloxane mixture is composed of octamethylcyclotetrasiloxane and tetramethylcyclotetrasiloxane mixed in a volume ratio of 1-2:1.

[0022] Furthermore, the volume ratio of the toluene, the intermediate, allyl glycidyl ether, and the isopropyl ketone solution of chloroplatinic acid is 80:8.3-10.4:7.6-11.4:0.8; wherein the concentration of the isopropyl ketone solution of chloroplatinic acid is 2-3%.

[0023] A wrinkle-resistant polyamide fabric is produced by the above production process.

[0024] Beneficial effects of the present invention:

[0025] The modified anti-wrinkle finishing agent of the present invention contains epoxy groups in its molecules. When it is blended with polyamide fabric, the modified anti-wrinkle finishing agent can be firmly bonded to the polyamide fabric molecules through a ring-opening reaction, and a network covalent cross-linking structure is formed on the polyamide molecules, thereby improving the interfacial compatibility and interfacial bonding strength between the polyamide fabric and the modified anti-wrinkle finishing agent. At the same time, the modified anti-wrinkle finishing agent molecules also have thermally dissociable oxime-carbamate bonds. When the polyamide fabric is baked, the oxime-carbamate bonds are decomposed to release active isocyanate groups, and the isocyanate groups can also form covalent bonds with amino groups in the polyamide fabric molecules. Cross-linking, under the action of multiple covalent bonds with strong binding force, connects adjacent molecular chains in the fabric fibers to each other, hinders the relative slippage between fiber molecules, makes the polyamide fiber not easy to deform, and even if it is deformed, it can recover to its original state under the strong force of covalent bonds, giving the polyamide fabric good wrinkle and deformation resistance. In addition, the modified anti-wrinkle finishing agent of the present invention has soft and smooth silicone segments and flexible group ether bonds in the molecules, which can give the polyamide fabric good softness and effectively disperse stress, avoiding strong damage caused by stress concentration caused by covalent cross-linking.

[0026] The present invention introduces a padding finishing emulsion with good stability, thereby effectively avoiding the inactivation of isocyanate groups in the padding finishing emulsion by reaction with water, thereby improving the anti-wrinkle activity of the modified anti-wrinkle finishing agent, and at the same time, by introducing a modified silicone resin, the polyamide fabric is given good flexibility, so that the modified polyamide fabric can better maintain its original strength. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0028] Example 1

[0029] This embodiment provides a modified silicone resin, which is prepared by the following steps:

[0030] A1. Add 5 mL of tetramethylcyclotetrasiloxane to 5 mL of octamethylcyclotetrasiloxane, mix well, and obtain a cyclotetrasiloxane mixture;

[0031] A2. Add 1 mL of tetramethyldisiloxane to 10 mL of the cyclotetrasiloxane mixture in a nitrogen atmosphere, stir evenly at 40 ° C, add 0.5 mL of concentrated sulfuric acid and stir at 50 ° C for 4 h, cool to room temperature, adjust the pH value to neutral with anhydrous sodium carbonate, filter and retain the liquid, and then distill under reduced pressure to obtain an intermediate;

[0032] A3. Add 8.3 mL of the intermediate and 7.6 mL of allyl glycidyl ether to 80 mL of toluene, mix well, add 0.8 mL of a 2% solution of chloroplatinic acid in isopropyl ketone, pre-react at 45 ° C for 30 min, then heat to 80 ° C, continue stirring to react for 1 h, and then obtain a modified silicone resin after rotary evaporation.

[0033] Example 2

[0034] This embodiment provides a modified silicone resin, which is prepared by the following steps:

[0035] A1. Add 5 mL of tetramethylcyclotetrasiloxane to 10 mL of octamethylcyclotetrasiloxane and mix well to obtain a cyclotetrasiloxane mixture;

[0036] A2. Add 1.5 mL of tetramethyldisiloxane to 12 mL of the cyclotetrasiloxane mixture in a nitrogen atmosphere, stir evenly at 43 ° C, add 0.5 mL of concentrated sulfuric acid and stir at 55 ° C for 4.5 h. After cooling to room temperature, adjust the pH value to neutral with anhydrous sodium carbonate, filter and retain the liquid, and then distill under reduced pressure to obtain an intermediate;

[0037] A3. Add 9.4 mL of the intermediate and 9.4 mL of allyl glycidyl ether to 80 mL of toluene, mix well, add 0.8 mL of 2.5% chloroplatinic acid in isopropyl ketone solution, pre-react at 48 ° C for 30 min, then heat to 85 ° C, continue stirring and react for 2 h, and then obtain a modified silicone resin after rotary evaporation.

[0038] Example 3

[0039] This embodiment provides a modified silicone resin, which is prepared by the following steps:

[0040] A1. Add 5 mL of tetramethylcyclotetrasiloxane to 10 mL of octamethylcyclotetrasiloxane and mix well to obtain a cyclotetrasiloxane mixture;

[0041] A2. Add 2 mL of tetramethyldisiloxane to 15 mL of the cyclotetrasiloxane mixture in a nitrogen atmosphere, stir evenly at 45 °C, add 0.5 mL of concentrated sulfuric acid and stir at 60 °C for 5 h, cool to room temperature, adjust the pH value to neutral with anhydrous sodium carbonate, filter and retain the liquid, and then distill under reduced pressure to obtain an intermediate;

[0042] A3. Add 10.4 mL of the intermediate and 11.4 mL of allyl glycidyl ether to 80 mL of toluene, mix well, add 0.8 mL of a 3% solution of chloroplatinic acid in isopropyl ketone, pre-react at 50°C for 30 min, then heat to 90°C, continue stirring and reacting for 3 h, and then obtain a modified silicone resin after rotary evaporation.

[0043] Comparative Example 1

[0044] Compared with Example 3, the difference is that allyl glycidyl ether is replaced by allyl polyoxyethylene ether in an equal amount, and the other raw materials and steps are the same.

[0045] Example 4

[0046] This embodiment provides a modified anti-wrinkle finishing agent, which is prepared by the following steps:

[0047] Under nitrogen protection, 23 mL of 8.92 wt% acetone solution of the modified silicone resin obtained in Example 1 was added dropwise to 20 mL of 10.57 wt% acetone solution of isophorone diisocyanate at 40° C. while stirring. The addition time was controlled to be 5 min. After the addition was completed, the mixture was reacted at 50° C. for 2 h, and then 0.5 mL of methyl ethyl ketone oxime was added to continue the reaction for 1 h. After vacuum rotary evaporation, a modified anti-wrinkle finishing agent was obtained.

[0048] Example 5

[0049] This embodiment provides a modified anti-wrinkle finishing agent, which is prepared by the following steps:

[0050] Under nitrogen protection, 23 mL of 10.8 wt % acetone solution of the modified silicone resin obtained in Example 2 was added dropwise to 20 mL of 11.62 wt % acetone solution of isophorone diisocyanate at 48° C. while stirring. The addition time was controlled to be 8 min. After the addition was completed, the mixture was reacted at 53° C. for 2.5 h, and then 0.8 mL of methyl ethyl ketone oxime was added to continue the reaction for 1 h. After vacuum rotary evaporation, a modified anti-wrinkle finishing agent was obtained.

[0051] Example 6

[0052] This embodiment provides a modified anti-wrinkle finishing agent, which is prepared by the following steps:

[0053] Under nitrogen protection, 23 mL of 13.4 wt% acetone solution of the modified silicone resin obtained in Example 3 was added dropwise to 20 mL of 12.32 wt% acetone solution of isophorone diisocyanate at 45° C. while stirring. The addition time was controlled to be 10 min. After the addition was completed, the mixture was reacted at 55° C. for 3 h, and 1 mL of methyl ethyl ketone oxime was added to continue the reaction for 1.5 h. After vacuum rotary evaporation, a modified anti-wrinkle finishing agent was obtained.

[0054] Comparative Example 2

[0055] Compared with Example 6, the difference is that the modified silicone resin prepared in Comparative Example 1 is used, and the other raw materials and steps are the same

[0056] Comparative Example 3

[0057] Compared with Example 6, the difference is that the modified silicone resin prepared in Example 3 is replaced by an equal amount of commercially available silicone resin, and the other raw materials and steps are the same.

[0058] Example 7

[0059] This embodiment provides a production process for wrinkle-resistant polyamide fabrics, comprising the following steps:

[0060] S1. Preparation of padding finishing emulsion:

[0061] 500 mL of deionized water was added to 50 mL of the modified anti-wrinkle finishing agent prepared in Example 6 while stirring to form an emulsion, and then 2 mL of penetrant JFC was added and continued to stir and mix to obtain a padding finishing emulsion;

[0062] S2. Preparation of wrinkle-resistant polyamide fabric:

[0063] Add 10g of polyamide fabric to 400mL of padding finishing emulsion, perform double dipping and double padding, with a liquid rate of 80%, pre-bake at 80℃ for 3min, bake at 120℃ for 3min, and then wash and dry to obtain the wrinkle-resistant polyamide fabric.

[0064] Example 8

[0065] This embodiment provides a production process for wrinkle-resistant polyamide fabrics, comprising the following steps:

[0066] S1. Preparation of padding finishing emulsion:

[0067] 500 mL of deionized water was added to 55 mL of the modified anti-wrinkle finishing agent prepared in Example 5 while stirring to form an emulsion, and 2.5 mL of penetrant JFC was added and continued to stir and mix to obtain a padding finishing emulsion;

[0068] S2. Preparation of wrinkle-resistant polyamide fabric:

[0069] 11 g of polyamide fabric was added to 400 mL of padding finishing emulsion, and double dipping and double padding were performed with a liquid rate of 85%. The fabric was pre-baked at 80°C for 3 min, then baked at 125°C for 3 min, and then washed and dried to obtain the wrinkle-resistant polyamide fabric.

[0070] Example 9

[0071] This embodiment provides a production process for wrinkle-resistant polyamide fabrics, comprising the following steps:

[0072] S1. Preparation of padding finishing emulsion:

[0073] 500 mL of deionized water was added to 60 mL of the modified anti-wrinkle finishing agent prepared in Example 4 while stirring to form an emulsion, and 3 mL of penetrant JFC was added and continued to stir and mix to obtain a padding finishing emulsion;

[0074] S2. Preparation of wrinkle-resistant polyamide fabric:

[0075] 12 g of polyamide fabric was added to 400 mL of padding finishing emulsion, and double dipping and double padding were performed with a liquid rate of 90%. The fabric was pre-baked at 80°C for 3 min, then baked at 130°C for 3 min, and then washed and dried to obtain the wrinkle-resistant polyamide fabric.

[0076] Comparative Example 4

[0077] Compared with Example 7, the difference is that the modified anti-wrinkle finishing agent prepared in Comparative Example 2 is used, and the other raw materials and steps are the same.

[0078] Comparative Example 5

[0079] Compared with Example 7, the difference is that the modified anti-wrinkle finishing agent prepared in Comparative Example 3 is used, and the other raw materials and steps are the same.

[0080] Comparative Example 6

[0081] Compared with Example 7, the difference is that the modified anti-wrinkle finishing agent prepared in Example 6 is replaced by an equal amount of a commercially available citric acid anti-wrinkle finishing agent, and the remaining raw materials and steps are the same.

[0082] Performance tests were performed on Examples 7 to 9 and Comparative Examples 4 to 6. Washing resistance test: referring to GB / T 3921-2008, the wrinkle recovery angle before and after washing 10 times was tested; wrinkle recovery angle test: referring to AATCC66-2008, the sample was made into a specimen with a specification of 40 mm×15 mm, and the sample was tested and the sum of the warp and weft wrinkle recovery angles was calculated using a wrinkle recovery angle tester at a temperature of (21±1)°C and a relative humidity of (65±2)%. Determination of breaking strength retention rate: referring to GB / T3923.1-1997, a universal tensile testing machine was used to test the radial breaking strength of the sample before and after finishing and calculate the breaking strength retention rate. The results are shown in Table 1:

[0083] Table 1

[0084]

[0085] It can be seen from Table 1 that the sum of the wrinkle recovery angles of the polyamide fabrics prepared by impregnation with the modified anti-wrinkle finishing agent in Examples 7-9 is significantly greater than that in Comparative Examples 4-6, and has good anti-wrinkle performance. At the same time, the breaking strength retention rate can reach up to 94.5%, indicating that the strength damage caused by the modified anti-wrinkle finishing agent is less, and the original strength of the polyamide fabric can be well maintained; in addition, compared with Comparative Examples 4 and 6, the sum of the wrinkle recovery angles of Example 7 after washing is greater than that of Comparative Examples 4 and 6, indicating that the polyamide fabric prepared by the modified anti-wrinkle finishing agent has higher wrinkle resistance and water washability.

[0086] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0087] 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 production process for wrinkle-resistant polyamide fabric, characterized in that: The following steps are involved: S1: adding deionized water to the modified anti-wrinkle finishing agent while stirring to form an emulsion, and then adding the penetrant JFC and continuing to stir and mix to obtain a padding finishing emulsion; S2: Add polyamide fabric to the padding finishing emulsion, perform double dipping and double padding, the liquid carrying rate is 80-90%, pre-bake at 80°C for 3 minutes, bake at 120-130°C for 3 minutes, and then wash and dry to obtain the wrinkle-resistant polyamide fabric.

2. The production process of a wrinkle-resistant polyamide fabric according to claim 1, characterized in that: In step S1, the volume ratio of the modified anti-wrinkle finishing agent, deionized water, and penetrant JFC is 50-60:500:2-3; and in step S2, the amount ratio of the padding finishing emulsion and the polyamide fabric is 400 mL:10-12 g.

3. The production process of a wrinkle-resistant polyamide fabric according to claim 1, characterized in that: The modified anti-wrinkle finishing agent is prepared by the following steps: Under nitrogen protection, add the modified silicone resin acetone solution to the 40-45°C isophorone diisocyanate acetone solution while stirring, and control the dropping time to be 5-10min. After the addition is completed, react at 50-55°C for 2-3h, then add methyl ethyl ketone oxime and continue to react for 1-1.5h. After vacuum rotary evaporation, a modified anti-wrinkle finishing agent is obtained.

4. The production process of a wrinkle-resistant polyamide fabric according to claim 3, characterized in that: The volume ratio of the isophorone diisocyanate acetone solution, the modified silicone resin acetone solution and methyl ethyl ketone oxime is 20:23:0.5-1; the concentration of the isophorone diisocyanate acetone solution is 10.57-12.32wt%; the concentration of the modified silicone resin acetone solution is 8.92-13.4wt%.

5. The production process of a wrinkle-resistant polyamide fabric according to claim 4, characterized in that: The modified silicone resin is prepared by the following steps: A1. Add tetramethyldisiloxane to the cyclotetrasiloxane mixture in a nitrogen atmosphere, stir evenly at 40-45° C., add concentrated sulfuric acid and stir at 50-60° C. for 4-5 hours, cool to room temperature, adjust the pH value to neutral with anhydrous sodium carbonate, filter and retain the liquid, and then distill under reduced pressure to obtain an intermediate; A2. Add the intermediate and allyl glycidyl ether to toluene, mix well, add isopropyl chloroplatinic acid solution in isopropyl ketone, pre-react at 45-50°C for 30 minutes, then heat to 80-90°C, continue stirring to react for 1-3 hours, and then obtain modified silicone resin after rotary evaporation.

6. The production process of a wrinkle-resistant polyamide fabric according to claim 5, characterized in that: The volume ratio of the cyclotetrasiloxane mixture, tetramethyldisiloxane and concentrated sulfuric acid is 10-15:1-2:0.

5.

7. The production process of a wrinkle-resistant polyamide fabric according to claim 5, characterized in that: The cyclotetrasiloxane mixture is composed of octamethylcyclotetrasiloxane and tetramethylcyclotetrasiloxane mixed in a volume ratio of 1-2:

1.

8. The production process of a wrinkle-resistant polyamide fabric according to claim 5, characterized in that: The volume ratio of the toluene, the intermediate, allyl glycidyl ether and the isopropyl ketone solution of chloroplatinic acid is 80:8.3-10.4:7.6-11.4:0.8; wherein the concentration of the isopropyl ketone solution of chloroplatinic acid is 2-3%.

9. A wrinkle-resistant polyamide fabric, characterized in that: Prepared according to the production process according to any one of claims 1 to 8.

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