阅读说明：本技术 织物后整理液的制备方法及使用方法 (Preparation method and use method of fabric after-finishing liquid ) 是由 高卫东 王雪纯 罗雄方 傅佳佳 张建祥 耿彩花 刘德铭 张凯 于 2019-11-18 设计创作，主要内容包括：本发明涉及到一种织物后整理液的制备方法及使用方法,其中制备方法包括在氮气保护下,在四口烧瓶中加入多元醇、催化剂、二异氰酸酯、扩链剂反应生成聚氨酯预聚物,再加入中和剂中和,再加入有机硅改性,最后加入去离子水乳化,制到阳离子有机硅改性水性聚氨酯；将阳离子有机硅改性水性聚氨酯和抗皱整理剂复配得到织物后整理液。使用方法包括将织物浸入织物后整理液中,经二浸二轧后依次进行烘干,焙烘。本发明将阳离子有机硅改性水性聚氨酯和抗皱整理剂进行复配,使得织后整理过程中,在棉纤维内部形成交联的同时在纤维表面或织物组织间隙中沉积,内部交联与表面沉积成膜两者协同作用使得织物折皱回复性提高,同时保持较低的强力损失。(The invention relates to a preparation method and a use method of fabric after-finishing liquid, wherein the preparation method comprises the steps of adding polyol, a catalyst, diisocyanate and a chain extender into a four-neck flask under the protection of nitrogen to react to generate polyurethane prepolymer, adding a neutralizer to neutralize, adding organosilicon for modification, and finally adding deionized water for emulsification to prepare cationic organosilicon modified waterborne polyurethane; and compounding the cationic organic silicon modified waterborne polyurethane and the crease-resistant finishing agent to obtain the fabric after-finishing liquid. The application method comprises the steps of immersing the fabric into the fabric after-finishing liquid, sequentially drying after two immersion and two rolling, and baking. According to the invention, the cationic organic silicon modified waterborne polyurethane and the crease-resistant finishing agent are compounded, so that crosslinking is formed in cotton fibers and simultaneously the crosslinking is deposited on the fiber surfaces or in fabric tissue gaps in the finishing process after weaving, and the synergistic effect of the internal crosslinking and surface deposition film forming enables the crease recovery of the fabric to be improved and lower strength loss to be maintained.)

1. The preparation method of the fabric after-finishing liquid is characterized by comprising the following specific steps of:

a. under the protection of nitrogen, adding 15-20 parts by mass of polyol and 0.1-0.2 part by mass of catalyst into a four-neck flask, heating to 80 ℃, fully mixing, then adding 8-10 parts by mass of diisocyanate for reaction, after the reaction is carried out for 1.5h, adding 1.64-2.28 parts by mass of chain extender, reacting for 3h again to generate polyurethane prepolymer, cooling the polyurethane prepolymer to 40 ℃, adding 0.88-1.58 parts by mass of neutralizer for neutralization reaction, wherein the neutralization degree is 80-130%, then adding 3.7-4.9 parts by mass of organic silicon for modification, heating to 45 ℃, reacting for 45min, and finally adding 90 parts by mass of deionized water for high-speed stirring and emulsifying to prepare the cationic organic silicon modified waterborne polyurethane;

b. and (b) compounding the cationic organic silicon modified waterborne polyurethane prepared in the step (a) with an anti-crease finishing agent to obtain a fabric after-finishing liquid, wherein the concentration of the cationic organic silicon modified waterborne polyurethane in the fabric after-finishing liquid is 20-120 g/L, and the concentration of the anti-crease finishing agent is 60-100 g/L.

2. The method of claim 1, wherein the diisocyanate is an aromatic or (cyclo) aliphatic diisocyanate.

3. The method of claim 1, wherein the polyol is one or more of a long chain polyester, polyether, or polycarbonate polyol.

4. The method of claim 1, wherein the catalyst is dibutyltin dilaurate.

5. The method of claim 1, wherein the chain extender is N-methyldiethanolamine.

6. The method of claim 1, wherein the neutralizing agent is acetic acid.

7. The method of claim 1, wherein the silicone has reactive groups that react with the reactive functional group isocyanate to form covalent bonds.

8. The use method of the fabric after-finishing liquid as claimed in any one of claims 1 to 7, characterized by comprising the following specific steps:

1) firstly, soaking the fabric into the finishing liquid after the fabric is soaked for two times, drying and baking the fabric in sequence after the fabric is soaked for two times, and finally obtaining the finished cotton fabric.

9. The use method of the fabric after-finishing liquid according to claim 8, characterized in that the rolling residual rate of the two-dipping and two-rolling is 75-80%, the drying temperature is 50-80 ℃, and the time duration is 1-10 min; the baking temperature is 100-180 ℃, and the baking time is 1-10 min.

The technical field is as follows:

the invention belongs to the technical field of fabric after-finishing, and particularly relates to a preparation method and a use method of fabric after-finishing liquid.

Background art:

the crease-resistant finishing of cotton fabrics is an important processing procedure for improving the clothes taking function of the fabrics and increasing the added value of the fabrics. The traditional crease-resistant finishing of cotton fabrics mostly uses N-hydroxy finishing agents, but the finished textiles have the defects of generating free formaldehyde in the process of taking, reducing the strength of the finished fabrics and the like.

The invention content is as follows:

the invention firstly solves the technical problems that: provides a preparation method of the fabric after-finishing liquid which can enable the finished cotton fabric to have double effects of low strength loss and crease resistance and does not generate free formaldehyde.

In order to solve the technical problems, the invention adopts the technical scheme that: the preparation method of the fabric after-finishing liquid comprises the following specific steps:

a. under the protection of nitrogen, adding 15-20 parts by mass of polyol and 0.1-0.2 part by mass of catalyst into a four-neck flask, heating to 80 ℃, fully mixing, then adding 8-10 parts by mass of diisocyanate for reaction, after the reaction is carried out for 1.5h, adding 1.64-2.28 parts by mass of chain extender, reacting for 3h again to generate polyurethane prepolymer, cooling the polyurethane prepolymer to 40 ℃, adding 0.88-1.58 parts by mass of neutralizer for neutralization reaction, wherein the neutralization degree is 80-130%, then adding 3.7-4.9 parts by mass of organic silicon for modification, heating to 45 ℃, reacting for 45min, and finally adding 90 parts by mass of deionized water for high-speed stirring and emulsifying to prepare the cationic organic silicon modified waterborne polyurethane;

b. and (b) compounding the cationic organic silicon modified waterborne polyurethane prepared in the step (a) with an anti-crease finishing agent to obtain a fabric after-finishing liquid, wherein the concentration of the cationic organic silicon modified waterborne polyurethane in the fabric after-finishing liquid is 20-120 g/L, and the concentration of the anti-crease finishing agent is 60-100 g/L.

As a preferred embodiment, the diisocyanate is an aromatic or (cyclo) aliphatic diisocyanate.

As a preferred embodiment, the polyol is one or more of a long-chain polyester, polyether or polycarbonate polyol.

As a preferred embodiment, the catalyst is dibutyltin dilaurate. As a preferable scheme, the chain extender is N-methyldiethanolamine.

Preferably, the neutralizing agent is acetic acid.

Preferably, the silicone has reactive groups capable of reacting with the reactive functional group isocyanate to form covalent bonds.

The invention further aims to solve the technical problems that: the application method of the fabric after-finishing liquid prepared by the preparation method is provided, and the fabric after-finishing liquid is used according to the application method, so that the crease recovery performance of the finished cotton fabric can be improved, and meanwhile, the lower strength loss is kept.

In order to solve the technical problems, the invention adopts the technical scheme that: the application method of the fabric after-finishing liquid comprises the following specific steps: 1) firstly, soaking the fabric into the finishing liquid after the fabric is soaked for two times, drying and baking the fabric in sequence after the fabric is soaked for two times, and finally obtaining the finished cotton fabric.

As a preferable scheme, the rolling residual rate of the second soaking and the second rolling is 75-80%, the drying temperature is 50-80 ℃, and the time is 1-10 min; the baking temperature is 100-180 ℃, and the baking time is 1-10 min.

The invention has the beneficial effects that: according to the invention, the cationic organic silicon modified waterborne polyurethane and the crease-resistant finishing agent are compounded to obtain the fabric after-finishing liquid, so that the fabric after-finishing liquid is deposited on the surface of the fiber or in the gaps of fabric tissue while forming cross-links in cotton fibers during the after-finishing of cotton fabrics, and the recovery performance of the creases of the cotton fabrics is further improved under the synergistic effect of the internal cross-links and the surface deposition film forming, and meanwhile, the low strength loss is kept, and formaldehyde is not released.

Meanwhile, the invention provides a using method of the fabric after-finishing liquid, so that the effect of the fabric after-finishing liquid is realized maximally.

The specific implementation mode is as follows:

the present invention will be described in detail below with reference to specific examples.