CN-116120635-B - Functionalized surface modifier, modified material and modification method thereof

Abstract

The invention belongs to the field of material surface modification, and relates to a novel functional surface modifier, a modified material prepared by modification of the novel functional surface modifier and a modification method. The present invention indicates that liquid metal-containing materials can be used as surface modifiers. That is, it is pointed out that the liquid metal-containing substances can be used as surface modifiers for materials (including fillers) to improve the dispersibility of the relevant materials in composite materials while improving the functionality of the materials, such as electrical conductivity, dielectric conductivity, magnetic conductivity, thermal conductivity, photo-thermal conductivity, medical use and the like. The invention realizes the functional modification of materials (including fillers) through a simple one-step method, has no solvent or byproducts, does not need post treatment, is a novel technology with simple production and strong universality, solves the problem that the traditional surface modification mode can not provide functional gain, and can improve the dispersion of the fillers.

Inventors

• FU QIANG
• XIE ZILONG
• WU KAI
• ZHANG QIN
• CHEN FENG
• WU DIE

Assignees

• 四川大学

Dates

Publication Date

20260505

Application Date

20221225

Claims (1)

1. 1. A method for improving dielectric constant and/or hydrophilicity and lipophilicity of a filler is characterized by comprising the steps of modifying the filler by using a liquid metal-containing substance, and preparing a corresponding modified filler by adopting a mechanical mixing processing method of the filler and the liquid metal-containing substance, wherein the volume ratio of the liquid metal-containing substance to the filler is 0.5-vol% to 6.00vol% and 99.50-vol% -94.00 vol%, and the mechanical mixing processing method is that the liquid metal is modified by utilizing physical and chemical effects induced by shearing force and pressure during mixing; the filler is selected from barium titanate, the liquid metal-containing substance is gallium indium tin liquid metal, and the sum of the volume ratio of the gallium indium tin liquid metal to the filler is 100%.

Description

Functionalized surface modifier, modified material and modification method thereof Technical Field The invention belongs to the field of material surface modification, and relates to a novel functional surface modifier, a modified material prepared by modification of the novel functional surface modifier and a modification method. Background The composite material is widely used in the fields of traffic, construction, electronic power and energy. In applications, it is often desirable to surface modify filler particles in a composite in order to obtain good filler dispersion and interfacial bonding to improve the properties of the composite. However, conventional surface modification methods such as plasma treatment, surface oxidation, phosphate modification, silane coupling agent treatment, dopamine treatment, surface grafting, etc., although enhancement of mechanical properties (strength and modulus) of the composite material can be achieved. However, these methods have very limited gains in electrical, magnetic, thermal, acoustic, and optical functions of the composite material. This cannot meet the increasingly abundant demands of functional materials in the fields of electronics, power, energy and environment. This is mainly due to the intrinsic functionality (electrical, magnetic, thermal, acoustic and optical) of the traditional organically modified layers (organic molecules and groups), the transfer of functions across the interface between the filler/matrix being hindered or even passivated, so that the functionality of the composite material is hardly changed after modification and sometimes also reduced (e.g. conductivity and dielectric constant in polymer composites). Modification of the second component (such as metallic materials and inorganic ceramic materials) with outstanding functionality to the filler surface holds promise to solve this problem. This generally requires the use of techniques such as deposition and electrostatic assembly which, although addressing the problem of functional enhancement, are not ideal for the versatility and modification of the filler and do not improve the dispersion of the filler. In summary, currently, there is a few surface modification methods that can solve both the problems of filler function and dispersion, and have good universality and scalability. Disclosure of Invention Aiming at the problems in the field of surface modification of the existing filler, the invention aims to provide a more universal functional surface modifier, a modification method thereof and a prepared modified material; the invention uses the substance containing liquid metal (the liquid metal refers to a wide class of low-melting-point metal materials which are liquid at normal temperature or lower temperature, has the functions of intrinsic conduction, dielectric, heat conduction, photo-thermal and the like, and has weak interaction with fillers such as metal, inorganic ceramic and the like) to carry out surface modification on the materials (such as the fillers), the modification method is a mechanical forced mixing method, and the solid phase forced mechanical mixing induced strong shearing force and strong pressure are used for generating strong mechanochemical action to generate strong interface interaction between the liquid metal and the materials (initial fillers), thereby realizing the fixation of the liquid metal on the materials. The obtained liquid metal modified material can improve the dispersibility of materials such as fillers while improving the functionality (such as electric conduction, dielectric conduction, magnetic conduction, heat conduction, photo-thermal treatment, medical use and the like) of the materials (such as the fillers), is a mode which is obviously different from the traditional surface modification, is finished by using a one-step method, has no solvent or byproducts, does not need post-treatment, and is a novel technology with simple production and strong universality. The technical scheme of the invention is as follows: the first technical problem to be solved by the present invention is to indicate the use of liquid metal-containing substances as surface modifiers. That is, it is pointed out that the liquid metal-containing substances can be used as surface modifiers for materials (including fillers) and can improve the dispersibility of the relevant materials in composite materials while improving the functionality (electrical conductivity, dielectric conductivity, magnetic conductivity, thermal conductivity, photo-thermal conductivity, medical use, etc.). Further, the liquid metal-containing substance is used as a surface modifier for the filler. When the liquid metal-containing substance is used for the surface modifier of the filler, the specific method is that the liquid metal-containing substance is added into the filler, and then the corresponding modified filler is obtained by adopting a mechanical mixing processing method, wherei