CN-119751978-B - Preparation method of surface hydrophobic modified nano inorganic powder and functional fiber

CN119751978BCN 119751978 BCN119751978 BCN 119751978BCN-119751978-B

Abstract

The invention relates to a preparation method of surface hydrophobic modified nano inorganic powder and functional fiber, which comprises the steps of firstly, heating and reacting the nano inorganic powder with boric acid to obtain hydroxyl activated nano inorganic powder; and then reacting the hydroxyl activated nano inorganic powder with long carbon chain alkanol to obtain the surface hydrophobic modified nano inorganic powder. The preparation method of the functional fiber comprises the steps of carrying out melt blending extrusion on surface hydrophobic modified nano inorganic powder, polymer slices, dispersing agents and antioxidants to obtain functional master batches, and carrying out melt spinning to obtain the functional fiber. Compared with the prior art, the invention can solve the problems of uneven dispersion and easy agglomeration of nano inorganic powder in organic polymer, so that the nano inorganic powder is uniformly dispersed in the fiber to improve the comprehensive performance of the composite fiber.

Inventors

LI FAXUE
ZHANG LONGFENG
YUAN RUCHAO
YU JIANYONG

Assignees

东华大学

Dates

Publication Date: 20260512
Application Date: 20250114

Claims (7)

1. The preparation method of the surface hydrophobic modified nano inorganic powder is characterized by comprising the following steps of: S1, heating nano inorganic powder and boric acid at 400-600 ℃ for 2-5 hours to obtain hydroxyl activated nano inorganic powder, wherein the nano inorganic powder is selected from one or more of nano silicon dioxide, nano titanium dioxide, nano tourmaline, nano zirconium carbide or nano zinc oxide, the particle size of the nano inorganic powder is 10-500 nm, and the mass ratio of the nano inorganic powder to the boric acid is 5-15:1; S2, reacting the hydroxyl activated nano inorganic powder with long-carbon chain alkanol to obtain the surface hydrophobic modified nano inorganic powder, wherein the molecular formula of the long-carbon chain alkanol is CH 3 (CH 2 ) n OH, n=8-14, and the mass ratio of the nano inorganic powder to the long-carbon chain alkanol is 1:4-8.
2. The method for preparing surface hydrophobically modified nano inorganic powder according to claim 1, wherein in step S2, the catalyst is one or more of concentrated sulfuric acid, dodecylbenzenesulfonic acid, benzenesulfonic acid, and p-toluenesulfonic acid.
3. The method for preparing surface hydrophobically modified nano inorganic powder according to claim 1, wherein in step S2, the reaction temperature is 70-150 ℃ and the reaction time is 2-7 h.
4. The preparation method of the functional fiber is characterized by comprising the steps of carrying out melt blending extrusion on surface hydrophobic modified nano inorganic powder, polymer slices, dispersing agents and antioxidants to obtain functional master batches, and carrying out melt spinning to obtain the functional fiber; The surface hydrophobically modified nano inorganic powder is prepared by the method of any one of claims 1 to 3.
5. The method of producing a functional fiber according to claim 4, wherein the polymer chip is one selected from the group consisting of polyethylene terephthalate chip, polyamide chip, and polypropylene chip; The dispersing agent is vinyl bis-stearamide or zinc stearate, and the mass content of the dispersing agent in the functional master batch is 0.3-3%; the antioxidant is antioxidant 1010 or antioxidant 1076, and the mass content of the antioxidant in the functional master batch is 0.01-0.5%; the mass content of the surface hydrophobic modified nano inorganic powder in the functional master batch is 1-30%.
6. The method for preparing functional fibers according to claim 4, wherein the mass content of the surface hydrophobically modified nano inorganic powder in the functional fibers is 1-10%.
7. The method of producing functional fiber according to claim 4, wherein the melt spinning comprises directly melt spinning the functional master batch or mixing the functional master batch with the polymer chips added additionally, and then adding the functional master batch into a melt spinning machine for spinning.

Description

Preparation method of surface hydrophobic modified nano inorganic powder and functional fiber Technical Field The invention belongs to the technical field of materials, and relates to a preparation method of surface hydrophobic modified nano inorganic powder and functional fiber. Background The nano inorganic powder is used as an important functional material and plays a key role in a plurality of fields. In the fiber field, the application of the nano inorganic powder brings a plurality of excellent performances for fiber materials. For example, the nano inorganic powder can improve the strength, wear resistance and corrosion resistance of the fiber, and can endow the fiber with special functions of antibiosis, ultraviolet resistance, heat insulation, warmth retention and the like. In addition, the nano inorganic powder can also improve the dyeing property and the hand feeling of the fiber, so that the fiber is more comfortable and attractive. However, nano-inorganic powders also have some problems in application, the most prominent of which is easy agglomeration. This is mainly due to the extremely high specific surface area and surface energy of the nano-inorganic powder, which causes the particles to attract each other, thereby forming agglomerates. The agglomeration of the nano inorganic powder not only can reduce the dispersibility and stability of the nano inorganic powder, but also can influence the application effect of the nano inorganic powder in materials such as fibers and the like, so that the problem that spinning cannot be performed or the produced fibers have insufficient strength is solved. In order to solve the agglomeration problem of nano inorganic powder and improve the dispersibility and stability of the nano inorganic powder, a great deal of research work is carried out, and various surface modification methods are developed. At present, the common surface modification methods of the nano inorganic powder mainly comprise surface active agent modification, coupling agent modification, polymer coating modification and the like. Although these methods can improve the performance of nano-inorganic powders to some extent, there are also some disadvantages. For example, the surface active agent is easy to be modified to generate desorption phenomenon, so that the modification effect is unstable, the cost of the coupling agent modification is high, the process is complex, the side reaction is difficult to control in the modification process, the surface property of the modified nano inorganic powder is greatly influenced by the modification condition, the surface modification is not uniform, and the original performance of the nano inorganic powder can be influenced by the polymer coating modification. Disclosure of Invention The invention aims to provide a preparation method of surface hydrophobic modified nano inorganic powder and functional fiber, which is used for solving the agglomeration problem caused by the large specific surface area and the multiple surface hydroxyl groups of the nano inorganic powder, so as to solve the problems of uneven dispersion and easy agglomeration of the nano inorganic powder in an organic polymer, and ensure that the nano inorganic powder is uniformly dispersed in the fiber, thereby improving the comprehensive performance of the composite fiber. The aim of the invention can be achieved by the following technical scheme: the first aspect of the invention provides a preparation method of surface hydrophobic modified nano inorganic powder, comprising the following steps: S1, heating and reacting nano inorganic powder with boric acid to obtain hydroxyl activated nano inorganic powder; S2, reacting the hydroxyl activated nano inorganic powder with long carbon chain alkanol to obtain the surface hydrophobic modified nano inorganic powder. In step S1, the nano inorganic powder is selected from one or more of nano silicon dioxide, nano titanium dioxide, nano tourmaline, nano zirconium carbide or nano zinc oxide, the particle size of the nano inorganic powder is 10-500 nm, and the mass ratio of the nano inorganic powder to boric acid is 5-15:1. Further, in the step S1, in the heating reaction, the reaction temperature is 400-600 ℃, and the reaction time is 2-5 hours. Further, in step S2, the molecular formula of the long-carbon alkanol is CH 3(CH2)n OH, where n=8-14, and the mass ratio of the nano inorganic powder to the long-carbon alkanol is 1:4-8. Further, in the step S2, the catalyst is one or more of concentrated sulfuric acid, dodecylbenzene sulfonic acid, benzene sulfonic acid and p-toluene sulfonic acid. Further, in the step S2, in the reaction, the reaction temperature is 70-150 ℃ and the reaction time is 2-7 h. The second aspect of the invention provides a preparation method of functional fiber, comprising the steps of carrying out melt blending extrusion on surface hydrophobic modified nano inorganic powder, polymer slices, dispersing agent and antioxi