CN105256554B - A method to improve the color durability of electrostatic self-assembled biomimetic structure chromogenic textiles - Google Patents

Abstract

The present invention relates to textile dyeing and finishing technical field, more particularly to a kind of electrostatic self-assembled biomimetic features that improve add lustre to the method for textile color fastness.This method comprises the following steps：Silane coupler is configured to 0.3 3.0 g/L dispersion liquid with deionized water, it is ultrasonically treated 10 60 min, it is placed in the electrostatic self-assembled biomimetic features textile that adds lustre to completed is prepared in silane coupler aqueous dispersions, the h of water-bath oscillation treatment 0.5 3.0 under the conditions of 40 85 DEG C.Compared with existing fixation technology, the invention has the advantages that：The present invention is added lustre to textile using silane coupler processing biomimetic features, electrostatic self-assembled structure can be effectively improved to add lustre to the structural stability of film in itself and its binding strength with fabric, and then improve the durability of schemochrome, preparation technology is simple, without high temperature preliminary drying, bake water-washing process with the later stage, it is easy to implement, it is easy to industrialized production.

Description

A method to improve the color durability of electrostatic self-assembled biomimetic structure chromogenic textiles

technical field

The invention relates to the technical field of textile dyeing and finishing, in particular to a method for improving the color durability of a color-producing textile with an electrostatic self-assembly bionic structure.

Background technique

At present, the main way to make textiles produce color is by applying colored substances (dyes or pigments) on textiles. It is the result of selective absorption of light by colored substances, which is called pigment color. The blue sky, rainbow, butterfly wings, peacock feathers, shells and all kinds of dazzling gemstones in nature produce colors through the scattering, dispersion, interference or diffraction of light by the physical structure of a specific organization. for the structural color. Structural color usually has the advantages of high brightness, high saturation, iridescent phenomenon, and never fades. As long as the structure of the material is stable, its color will not diminish. By simulating the microstructure in nature and applying it to the bionic structure of textiles to produce color, new ecological textiles with iridescent effect (the effect that the color changes with the viewing angle) and lively like life can be prepared, which will have a very broad future. market prospects.

Regarding the preparation of bionic structural color-producing textiles, the Chinese invention patent CN 102991048 A applied by Donghua University discloses a method for preparing fabric structural color by electrostatic self-assembly method. The patent proposes to use electrostatic self-assembly technology to prepare composite films composed of polymers and inorganic nano-colloidal particles on PET (polyethylene terephthalate) films and fabrics, realizing the bionic structural coloration of textiles. Although the composite film mentioned in this patent has good stability, there is no detailed description and objective test evaluation of the color durability of the bionic structure color-producing fabric.

Using the electrostatic self-assembly method, our research group successfully prepared colorful SiO2 on polyester fabrics by alternately impregnating positively charged polyethyleneimine (PEI) aqueous solution and negatively charged _SiO2 nanoparticle sol solution. ₂ / PEI structural color film, by analyzing the morphology and optical properties of the film, the coloring mechanism of the structural color film is determined, and the self-assembly process model of the film is established, which provides certain theory and practice for the development of ecological coloring technology for textiles However, the color durability of this structural chromogenic textile has not yet met the requirements for industrial applications.

For pigment-colored textiles, the color durability is generally evaluated by color fastness indicators, including color fastness to rubbing, color fastness to washing, color fastness to sunlight, color fastness to perspiration, etc., among which color fastness to rubbing Fastness and color fastness to washing are important indicators for evaluating the color fastness of textiles. Electrostatic self-assembly bionic structure color-producing textiles mainly use the electrostatic force between nanoparticles and polymers to form a composite film on the surface of the fabric to make the textile appear colored. The structural stability of the composite film itself and the bonding fastness to the fabric are directly related. Affects the color fastness to rubbing and washing of structurally colored textiles. The color-fixing agents used to improve pigment color-producing textiles can be divided into three categories: cationic polymer-type color-fixing agents, resin-type color-fixing agents, and reactive crosslinking-type color-fixing agents. The main mechanism of action is: 1) Cationic color-fixing agents The water-soluble group of the anionic dye is blocked by the agent; 2) The polymer color fixing agent forms a film and coats the dye; 3) The reactive color fixing agent reacts with the dye. The above principles are based on the properties of dyes, so they are suitable for pigment-colored textiles, but not for structural color-producing textiles. At present, there are few studies and reports on improving the color durability of chromogenic textiles with electrostatic self-assembled biomimetic structures.

Silane coupling agent is a kind of organosilicon compound that contains two groups with different chemical properties in the molecule, which can not only react with inorganic substances, but also interact with organic molecules. The bridging effect of the silane coupling agent can improve the compatibility between inorganic and organic substances, thereby greatly improving the application performance of materials. SiO ₂ /PEI structural color film is a composite film composed of oppositely charged inorganic nanoparticles SiO ₂ and organic polymer PEI. When the silane coupling agent acts on the inorganic/organic composite film formed by electrostatic self-assembly, one end of the molecule can react with the _SiO2 nanoparticles in the film to form a silicon-oxygen bond, and the other end can interact with the PEI polymer, thereby A stronger inorganic/organic hybrid system is formed inside the composite film, and the coupling agent can also form a film by itself. The use of silane coupling agent to treat electrostatic self-assembled biomimetic structural color-producing textiles can effectively improve the structural stability of the composite film and its bonding fastness with the fabric, thereby improving its color fastness to rubbing and washing, and finally realizing its color. durability.

Contents of the invention

The invention provides a method for improving the color durability of electrostatic self-assembled bionic structure color-producing textiles. The method is simple to operate and easy to implement. The bionic structure color-producing fabric treated by the method has good friction resistance and color fastness to washing.

The technical solution adopted by the present invention to solve its technical problems is:

A method for improving the color durability of electrostatic self-assembled bionic structure color-producing textiles, comprising the following steps: using deionized water to prepare a silane coupling agent into a dispersion of 0.3-3.0 g/L, ultrasonically treating it for 10-60 minutes, and preparing The completed electrostatic self-assembled biomimetic structure color-producing textile is placed in a silane coupling agent aqueous dispersion, and is shaken in a water bath at 40-85°C for 0.5-3.0h. Silane coupling agent is a kind of substance, one end of which can react with inorganic substances, and the other end can interact with organic molecules. This invention uses silane coupling agent KH570 as an example to illustrate the improvement of the color durability of electrostatic self-assembled bionic structure color-producing textiles. In the permanent method, KH570 is a typical coupling agent, and those with similar structures are also available.

The silane coupling agent used in the present invention acts on the composite film formed by _SiO2 nanoparticles and macromolecule PEI, and can react with the hydroxyl groups on the surface of _SiO2 nanoparticles to generate Si-O bonds, and can react with macromolecule PEI simultaneously to form SiO ₂ nanoparticles-silane coupling agent-PEI hybrid material, and the dehydration condensation between the excess coupling agent forms a self-phase film, forming a flexible organic three-dimensional network structure, thereby improving the stability of the composite film structure and the film and fabric. Combining the fastness, and then improving the color fastness to rubbing and washing of the biomimetic structural chromogenic textiles, and finally realizing the durability of its color. The preparation process of the method is simple and easy to implement.

Preferably, the concentration of the aqueous dispersion of the silane coupling agent is 0.5-2.0 g/L. If the concentration is too high, the effect will not be improved significantly; if the concentration is too low, the bridging effect of the coupling agent will not be enough, and the improvement of the color fastness of the structure will not be enough.

Preferably, the aqueous dispersion of the silane coupling agent is ultrasonically treated for 15-40 minutes. The function of ultrasonic treatment is to disperse the silane coupling agent evenly in water.

Preferably, the shaking temperature of the water bath is 45-80°C. If the temperature is too high, the structure formed by self-assembly will be damaged, and if the temperature is too low, the area where the coupling agent can enter is limited.

Preferably, the shaking treatment in water bath is 0.5-1.5h.

As a preference, the preparation method of electrostatic self-assembled bionic structure color-producing textiles is as follows:

Use 0.3-0.5wt.% PEI aqueous solution as assembly solution 1, use 0.2-0.4wt.% SiO ₂ nanoparticle sol as assembly solution 2, process the fabric to be assembled according to the following procedures, first fully soak in assembly solution 1 Finally, take it out, wash it with deionized water for 3-5 times, then immerse it in the assembly solution 2, and then wash it with deionized water for 3-5 times after fully immersing, so as to complete the assembly of a cycle of SiO ₂ /PEI composite film, repeat the above process The assembly of the n-period composite film is completed on the polyester fabric for n times, where n is a positive integer. The number of assembly cycles (n) is different, and the structural color is different. Assembly fluids of similar principle are also suitable.

The invention uses the silane coupling agent to treat the color-producing textiles with electrostatic self-assembly bionic structure, which can effectively improve the color fastness to friction and washing, and basically has no effect on the hand feeling of the fabrics, and the structural color of the textiles basically does not change before and after the treatment. In addition, the composite film treated with silane coupling agent is universal, that is, it has good reactivity and fixation effect on different kinds of inorganic nanoparticles/polymer composite films.

Silane coupling agents with structures similar to those in the present invention all belong to the protection scope of the present invention.

Compared with the prior art, the present invention has the following advantages: the present invention uses the silane coupling agent to treat the biomimetic structure color-producing textiles, which can effectively improve the structural stability of the composite film itself and its bonding fastness with the fabric, and the preparation process is simple. It does not need high-temperature pre-baking, baking and later water washing process, and is easy to implement and industrialized production.

detailed description

The technical solution of the present invention will be further specifically described below through specific examples. It should be understood that the implementation of the present invention is not limited to the following examples, and any modifications and/or changes made to the present invention will fall within the protection scope of the present invention.

In the present invention, unless otherwise specified, all parts and percentages are in weight units, and the equipment and raw materials used can be purchased from the market or commonly used in the field. The methods in the following examples, unless otherwise specified, are conventional methods in the art.

For the preparation and definition of electrostatic self-assembled biomimetic structural color-producing textiles, please refer to:

①Structural coloration of polyester fabrics with electrostatic self-assembly of(SiO2/PEI)n, Text.Res.J.2015,85(8):785-794;

② Electrostatic Self-Assembly Structure of Structural Chromogenic SiO2 Multilayers, Printing and Dyeing, 2012, (17): 1-4.

Example 1

(1) Preparation of electrostatic self-assembled biomimetic structure color-producing textiles

Use 0.3-0.5wt.% PEI aqueous solution as assembly solution 1, use 0.2-0.4wt.% SiO ₂ nanoparticle sol as assembly solution 2, and treat the black polyester fabric according to the following procedure, first fully soak in assembly solution 1 Take it out, wash it with deionized water for 3-5 times, then immerse it in the assembly solution 2, and then wash it with deionized water for 3-5 times after fully immersing, so as to complete the assembly of a cycle of SiO ₂ /PEI composite film, repeat the above process 8 An 8-cycle composite film assembly was completed on polyester fabric for the first time.

(2) Color durability treatment of biomimetic structural chromogenic textiles

The silane coupling agent (KH570) was formulated into a 2.0g/L dispersion with deionized water, treated ultrasonically for 40 minutes, and the prepared electrostatic self-assembled biomimetic structure color-producing textile was placed in the silane coupling agent aqueous dispersion. Shake in a water bath for 1.0 h at 55°C.

(3) Tests on the color fastness to rubbing and washing of bionic structural color-generated textiles are detailed as follows:

(a) Test of color fastness to rubbing:

According to the ISO105×16 standard, it is tested with a rotary rubbing color fastness tester. Electrostatic self-assembly bionic structure color-producing textiles cannot be evaluated by evaluating the color fastness to dry/wet rubbing of ordinary textiles. The present invention compares textiles that have not been treated with a silane coupling agent and have been treated with a silane coupling agent after dry/wet rubbing. The change of structural color and the damage of the composite film on the surface of the textile were used to evaluate the rubbing fastness of the bionic structural color-generated textile. In the present invention, the color fastness to rubbing is set to 5 grades, grade 1: poor, grade 2: poor, grade 3: average, grade 4: good, grade 5: good.

(b) Test of color fastness to washing:

Tested according to GB3921-83 Test method for color fastness to washing of textiles. Electrostatic self-assembly bionic structure color-producing textiles cannot be evaluated by evaluating the color fastness to washing of ordinary textiles. The present invention compares the changes in the structural color of textiles that have not been treated with silane coupling agents and those that have been treated with silane coupling agents after washing, and the textiles that have been treated with silane coupling agents. The damage of the composite film on the surface was used to evaluate the washing fastness of the biomimetic structural chromogenic textiles. In the present invention, the color fastness to washing is set to 5 grades, grade 1: poor, grade 2: poor, grade 3: general, grade 4: good, grade 5: good.

Example 2

(1) The preparation of the electrostatic self-assembled biomimetic structure color-producing textile is the same as that in Example 1.

(2) Color durability treatment of biomimetic structural chromogenic textiles

Prepare the silane coupling agent into a 0.8g/L dispersion with deionized water, ultrasonically treat it for 15 minutes, and place the prepared electrostatic self-assembled biomimetic structure color-producing textile in the silane coupling agent aqueous dispersion, at 45°C Shake in a water bath for 0.8h.

(3) The test of the color fastness to rubbing and washing resistance of the biomimetic structure color-producing textile is the same as that in Example 1.

Example 3

(1) The preparation of the electrostatic self-assembled biomimetic structure color-producing textile is the same as that in Example 1.

(2) Color durability treatment of biomimetic structural chromogenic textiles

Prepare the silane coupling agent into a 1.5g/L dispersion with deionized water, ultrasonically treat it for 30 minutes, and place the prepared electrostatic self-assembled biomimetic structure color-producing textile in the silane coupling agent aqueous dispersion, at 80°C Shake in a water bath for 1.5 hours.

(3) The test of the color fastness to rubbing and washing resistance of the biomimetic structure color-producing textile is the same as that in Example 1.

Example 4

(1) The preparation of the electrostatic self-assembled biomimetic structure color-producing textile is the same as that in Example 1.

(2) Color durability treatment of biomimetic structural chromogenic textiles

Prepare the silane coupling agent into a 0.5g/L dispersion with deionized water, ultrasonically treat it for 20 minutes, put the prepared electrostatic self-assembled biomimetic structure color-producing textile in the silane coupling agent water dispersion, and heat it at 70°C Shake in a water bath for 0.5h.

(3) The test of the color fastness to rubbing and washing resistance of the biomimetic structure color-producing textile is the same as that in Example 1.

The untreated sample number in above-mentioned embodiment 1-4 is 0, and the processing sample number is 1,2,3,4, and test result is as shown in the table below, can find out from table 1 that the dry/ The color fastness to wet rubbing and color fastness to washing were significantly higher than that of the untreated sample.

Table 1 Dry/wet rubbing color fastness and washing color fastness of treated and untreated fabrics

sample Color fastness to dry/wet rubbing Color fastness to washing 0 1-2 1-2 1 4 3-4 2 3-4 3-4 3 4 3-4 4 3 3

The embodiment described above is only a preferred solution of the present invention, and does not limit the present invention in any form. There are other variations and modifications on the premise of not exceeding the technical solution described in the claims.

Claims (5)

1. A method for improving the color durability of electrostatic self-assembled bionic structure color-producing textiles, characterized in that it may further comprise the steps: Prepare the silane coupling agent into a 0.3-3.0 g/L dispersion with deionized water, ultrasonically treat it for 10-60 min, and place the prepared electrostatic self-assembled biomimetic structure color-producing textile in the silane coupling agent aqueous dispersion , shaking in a water bath at 40-85°C for 0.5-3.0 h; The preparation method of the electrostatic self-assembled bionic structure color-producing textile is as follows: 0.3-0.5 wt.% PEI aqueous solution is used as assembly solution 1, and 0.2-0.4 wt.% SiO ₂ nanoparticle sol solution is used as assembly solution 2. The assembled fabric is processed according to the following procedures. First, it is fully immersed in assembly solution 1, then taken out, washed with deionized water for 3-5 times, then immersed in assembly solution 2, fully immersed, and then washed with deionized water for 3-5 times. In this way, one cycle of SiO ₂ /PEI composite film assembly is completed, and the above process is repeated n times to complete n cycle composite film assembly on the polyester fabric, where n is a positive integer. 2. The method for improving the color durability of electrostatic self-assembled bionic structure color-producing textiles according to claim 1, wherein the silane coupling agent is configured into a water-dispersed solution with a concentration of 0.5-2.0 g/L with deionized water liquid. 3. The method for improving the color durability of electrostatic self-assembled bionic structure color-producing textiles according to claim 1, characterized in that the aqueous dispersion of silane coupling agent is ultrasonically treated for 15-40 min. 4. The method for improving the color durability of electrostatically self-assembled bionic structure color-producing textiles according to claim 1, characterized in that the oscillation temperature of the water bath is 45-80°C. 5. The method for improving the color durability of electrostatic self-assembled bionic structure color-producing textiles according to claim 1, characterized in that, the water-bath oscillation treatment is 0.5-1.5 h.