CN-122013532-A - After-finishing process for improving stiffness of fabric

Abstract

The invention discloses a post-finishing process for improving fabric stiffness, which comprises the following steps of S1, adding polyester fabric into sodium hydroxide solution, carrying out dipping treatment to obtain pretreated fabric, S2, adding epoxy modified aqueous polyurethane emulsion, modified silicon dioxide, 2-ethyl-4-methylimidazole and fatty alcohol polyoxyethylene ether into deionized water, uniformly stirring to obtain finishing liquid, S3, carrying out padding treatment on the pretreated fabric in the finishing liquid, and carrying out post-treatment on the padded fabric. According to the invention, the alkali liquor impregnation process is adopted to pretreat the polyester fabric, a micro-coarse structure is formed on the surface of the fiber, and modified silicon dioxide introduced into the finishing liquor is used as a functional filler.

Inventors

• ZHU YANFENG
• HONG DAN

Assignees

• 浙江正达纺织科技有限公司

Dates

Publication Date

20260512

Application Date

20260228

Claims (10)

1. 1. The after-finishing process for improving the stiffness of the fabric is characterized by comprising the following steps of: s1, adding polyester fabric into a sodium hydroxide solution, carrying out dipping treatment, and filtering and washing after the treatment is finished to obtain a pretreated fabric; S2, adding the epoxy modified waterborne polyurethane emulsion, modified silicon dioxide, 2-ethyl-4-methylimidazole and fatty alcohol polyoxyethylene ether into deionized water, and uniformly stirring to obtain finishing liquid; And S3, padding the pretreated fabric in finishing liquid, and performing post-treatment on the padded fabric.
2. 2. The finishing process according to claim 1, wherein the mass concentration of the sodium hydroxide solution in the step S1 is 1.5-2%, the feed liquid ratio of the polyester fabric to the sodium hydroxide is 1:20-30, the temperature of the soaking treatment is 70-80 ℃ and the time is 20-30min.
3. 3. The post-finishing process according to claim 1, wherein in the step S2, the raw materials in the finishing liquid are 50-60 parts by weight of epoxy modified waterborne polyurethane emulsion, 5-8 parts by weight of modified silicon dioxide, 0.5-0.8 part by weight of 2-ethyl-4-methylimidazole, 1-2 parts by weight of fatty alcohol polyoxyethylene ether and 200 parts by weight of deionized water.
4. 4. The finishing process of claim 1, wherein the modified silica in step S2 is prepared by the following steps: (a) Adding silicon dioxide into ethanol water solution, then adding gamma-aminopropyl triethoxysilane, performing heating reaction, filtering, washing and drying after the reaction is completed to obtain aminated silicon dioxide; (b) Adding aminated silicon dioxide into acetone, then adding cyanuric chloride, stirring and reacting, adding triethylamine in the reaction process, keeping the pH of the system at 7-8, reacting for a preset time, and filtering, washing and drying to obtain the organic silicon dioxide; (c) Adding the organic silicon dioxide into DMF, then adding p-phenylenediamine and potassium carbonate, carrying out constant temperature reaction, and filtering, washing and drying after the reaction is finished to obtain the modified silicon dioxide.
5. 5. The finishing process according to claim 4, wherein the volume ratio of ethanol to water in the step (a) is 4-5:1, the mass ratio of silica and gamma-aminopropyl triethoxysilane is 100:5-8, the temperature of the heating reaction is 70-75 ℃ and the time is 4-6h.
6. 6. The finishing process according to claim 4, wherein the mass ratio of the aminated silica to the cyanuric chloride in the step (b) is 100:4.2-6.7, and the temperature of the stirring reaction is 0-5 ℃ for 2-3 hours.
7. 7. The finishing process according to claim 4, wherein the mass ratio of the organic silicon dioxide, the p-phenylenediamine and the potassium carbonate in the step (C) is 100:6-10:15-25, the temperature of the constant temperature reaction is 70-80 ℃ and the time is 8-10h.
8. 8. The finishing process according to claim 1, wherein the padding treatment in step S3 is performed by two padding and the padding residual ratio is 70-85%.
9. 9. The finishing process according to claim 1, wherein the post-treatment in step S3 is drying and baking, the temperature of drying is 90-110 ℃, the temperature of baking is 160-170 ℃ and the time is 2-3min.
10. 10. A fabric produced by the finishing process of any one of claims 1-9.

Description

After-finishing process for improving stiffness of fabric Technical Field The invention belongs to the technical field of fabric finishing, and particularly relates to a post-finishing process for improving fabric stiffness. Background The hand and style of a fabric is one of the key attributes that determine its end use and added value. Among the many styles, stiff, flat, and good conformality appearances are in wide demand in the fields of apparel (e.g., shirts, jackets), home textiles (e.g., curtains, tablecloths), and industrial textiles. Many fabrics in a natural state, particularly synthetic fiber fabrics such as polyester, are soft in texture and easy to deform, and are difficult to meet the requirements of the specific application scene. Therefore, the method for improving the stiffness and the dimensional stability of the fabric through the after-finishing mode is a conventional and important technical means in textile processing. At present, the traditional method for realizing the stiffening finishing of the fabric mainly comprises the following categories, wherein the first category is the principle of film formation by utilizing high molecular polymers. In the method, polymer emulsion such as polyvinyl acetate (PVA), polyacrylate (PA), polyurethane (PU) and the like is generally applied to the surface of a fabric in a padding mode, and after the polymer emulsion is dried to form a film, the polymer film fills gaps among fibers and bonds the fibers, so that the relative movement of the fibers is limited, and the aim of improving the stiffness of the fabric is fulfilled. However, such methods have inherent disadvantages in that firstly, the finishing agent is combined with the fibers (particularly, chemically stable polyester fibers) mainly by virtue of physical effects such as van der Waals force, the combination fastness is poor, the finishing effect is not durable, the stiffening effect after washing for many times is remarkably reduced, and secondly, in order to achieve the desired stiffness, a higher amount of the finishing agent is often required, which leads to excessively stiff and brittle fabric feel, poor air permeability and even influences the original gloss and color of the fabric. The second type is to add inorganic rigid particles such as ordinary silica, calcium carbonate, kaolin, etc. to the polymer emulsion to form an organic/inorganic composite finish. The introduction of inorganic particles can improve the modulus of the finishing film to a certain extent, and enhance the stiffening effect. However, unmodified inorganic particles have poor compatibility with an organic polymer matrix, are easy to agglomerate and settle in finishing liquid, lead to uneven dyeing, and form defects such as white spots, powder marks and the like on the surface of the fabric. Meanwhile, since the interfacial bonding force is weak, the inorganic particles are easily detached from the polymer film when subjected to external force or washing action, resulting in poor durability of the stiffening effect. The third category is to use self-crosslinking or external crosslinking type finishes. For example, resin finishing agents containing functional groups such as N-methylolacrylamide are used, and can undergo a crosslinking reaction under the action of a catalyst at high temperature to form a network structure, so that a better stiffening effect is given to the fabric. However, such formaldehyde-based resin finishes release free formaldehyde during processing and use, pose a potential threat to human health and the ecological environment, and their use has been limited by increasingly stringent regulations. The development of formaldehyde-free or low formaldehyde environment-friendly crosslinking finishing technology has become a necessary trend in industry development. Therefore, the development of the after-finishing technology which can not only endow the fabric with excellent and washable stiffening effect, but also keep good hand feeling, has environment-friendly and efficient process and has important practical application value and market prospect. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a post-finishing process for improving the stiffness of fabric. In order to achieve the above purpose, the present invention provides the following technical solutions: an after-finishing process for improving fabric stiffness comprises the following steps: S1, preprocessing the fabric, namely adding the polyester fabric into a sodium hydroxide solution for dipping treatment, and filtering and washing after finishing the treatment to obtain the preprocessed fabric; S2, preparing a finishing liquid, namely adding epoxy modified waterborne polyurethane emulsion, modified silicon dioxide, 2-ethyl-4-methylimidazole and fatty alcohol-polyoxyethylene ether into deionized water, and uniformly stirring to obtain the finishing liquid; S3, finishing the fabric, namely pa