Method for rapidly depositing dopamine or derivative thereof on surfaces of natural fibers in non-aqueous medium environment

Abstract

The invention relates to the field of surface modification of natural fibers and discloses a method for rapidly depositing dopamine or a derivative thereof on the surfaces of natural fibers in a non-aqueous medium environment. The method comprises the following steps: (1) soaking and preprocessing a natural fiber fabric in an alkali solution for later use; (2) adding dopamine or the derivative of dopamine into a non-aqueous medium, and adequately stirring so as to uniformly scatter dopamine or the derivative of dopamine in the medium; and (3) soaking the natural fiber fabric processed in the step (1) into the non-aqueous medium of the step (2), stirring, taking out the fabric, and flushing and drying the fabric. By utilizing the non-aqueous medium environment, a brand-new method for the modifying surfaces of the natural fibers by virtue of dopamine or the derivative of dopamine is provided. By utilizing the method, the uniform deposition of dopamine or the derivative of dopamine on the natural fibers can be realized in a short time, and the utilization rate of dopamine or the derivative of dopamine is high.

Description

technical field

[0001] The invention relates to the field of surface modification of natural fibers, in particular to a method for rapidly depositing dopamine or its derivatives on the surface of natural fibers in a non-aqueous medium environment. Background technique

[0002] In order to endow natural fibers with more properties, their surface often needs to be modified. However, most of the current modification methods are to introduce active functional groups on fibers through long-term reactions in harsh environments. For example, the hydroxyl groups on cellulose fibers are used to carry out heterogeneous chemical reactions with modifiers containing carboxyl groups and acid chloride groups in organic solvents to introduce active functional groups. However, the reaction time of this method is long, and the utilization rate of the modifier is low, the uniformity of the fiber surface is poor, and a large amount of resources are wasted.

[0003] Dopamine is a kind of subst...

Examples

Embodiment 1

[0027] 1) Treat 1g of pure cotton fabric with a mixed solution of 6g / L tris(hydroxymethyl)aminomethane and 10g / L ammonium persulfate, and perform one dipping and one rolling treatment after the fibers are fully swollen, and the liquid retention rate is controlled to 200% left and right, spare;

[0028] 2) Add 0.1g of dopamine into 10mL of n-hexane, stir, and the suspension is ready for use;

[0029] 3) Immerse the pure cotton fabric treated in step (1) in the non-aqueous medium (30 times the weight of the fabric) in step (2), and stir at room temperature for 30 minutes; the suspension becomes clear, take out the fabric, and rinse it with water for 3 times , and dried to obtain the modified cotton fabric.

Embodiment 2

[0031] 1) Treat 1g of silk fabric with a mixed solution of 6g / L tris(hydroxymethyl)aminomethane and 10g / L ammonium persulfate. After the fibers are fully swollen, perform one-dipping and one-rolling treatment to control the liquid retention rate to about 150%. ,spare;

[0032] 2) Add 0.1g of dopamine into 10mL of cyclohexane, stir, and keep the suspension for use;

[0033] 3) Immerse the silk fabric treated in step (1) in the non-aqueous medium (50 times the weight of the fabric) of step (2), and stir at room temperature for 45 minutes; the suspension becomes clear, take out the fabric, and rinse it 3 times with clear water, After drying, the modified silk fabric is obtained.

Embodiment 3

[0035] 1) Treat 1g of pure cotton fabric with a mixed solution of 2g / L tris(hydroxymethyl)aminomethane and 10g / L ammonium persulfate, and perform one dipping and one rolling treatment after the fibers are fully swollen, and the liquid retention rate is controlled to 200% left and right, spare;

[0036] 2) Add 0.1g of dopamine into 20mL of decamethylcyclopentasiloxane, stir, and the suspension is ready for use;

[0037] 3) Put the pure cotton fabric treated in step (1) into the non-aqueous medium (40 times the weight of the fabric) of (2), and stir at room temperature for 60 minutes; the suspension becomes clear, take out the fabric, and rinse it 3 times with clear water, After drying, the modified cotton fabric is obtained.

technical field

[0001] The invention relates to the field of surface modification of natural fibers, in particular to a method for rapidly depositing dopamine or its derivatives on the surface of natural fibers in a non-aqueous medium environment. Background technique

[0002] In order to endow natural fibers with more properties, their surface often needs to be modified. However, most of the current modification methods are to introduce active functional groups on fibers through long-term reactions in harsh environments. For example, the hydroxyl groups on cellulose fibers are used to carry out heterogeneous chemical reactions with modifiers containing carboxyl groups and acid chloride groups in organic solvents to introduce active functional groups. However, the reaction time of this method is long, and the utilization rate of the modifier is low, the uniformity of the fiber surface is poor, and a large amount of resources are wasted.

[0003] Dopamine is a kind of subst...

Examples

Embodiment 1

[0027] 1) Treat 1g of pure cotton fabric with a mixed solution of 6g / L tris(hydroxymethyl)aminomethane and 10g / L ammonium persulfate, and perform one dipping and one rolling treatment after the fibers are fully swollen, and the liquid retention rate is controlled to 200% left and right, spare;

[0028] 2) Add 0.1g of dopamine into 10mL of n-hexane, stir, and the suspension is ready for use;

[0029] 3) Immerse the pure cotton fabric treated in step (1) in the non-aqueous medium (30 times the weight of the fabric) in step (2), and stir at room temperature for 30 minutes; the suspension becomes clear, take out the fabric, and rinse it with water for 3 times , and dried to obtain the modified cotton fabric.

Embodiment 2

[0031] 1) Treat 1g of silk fabric with a mixed solution of 6g / L tris(hydroxymethyl)aminomethane and 10g / L ammonium persulfate. After the fibers are fully swollen, perform one-dipping and one-rolling treatment to control the liquid retention rate to about 150%. ,spare;

[0032] 2) Add 0.1g of dopamine into 10mL of cyclohexane, stir, and keep the suspension for use;

[0033] 3) Immerse the silk fabric treated in step (1) in the non-aqueous medium (50 times the weight of the fabric) of step (2), and stir at room temperature for 45 minutes; the suspension becomes clear, take out the fabric, and rinse it 3 times with clear water, After drying, the modified silk fabric is obtained.

Embodiment 3

[0035] 1) Treat 1g of pure cotton fabric with a mixed solution of 2g / L tris(hydroxymethyl)aminomethane and 10g / L ammonium persulfate, and perform one dipping and one rolling treatment after the fibers are fully swollen, and the liquid retention rate is controlled to 200% left and right, spare;

[0036] 2) Add 0.1g of dopamine into 20mL of decamethylcyclopentasiloxane, stir, and the suspension is ready for use;

[0037] 3) Put the pure cotton fabric treated in step (1) into the non-aqueous medium (40 times the weight of the fabric) of (2), and stir at room temperature for 60 minutes; the suspension becomes clear, take out the fabric, and rinse it 3 times with clear water, After drying, the modified cotton fabric is obtained.