Filler modifying method and application thereof

A modified and thermally conductive filler technology, which is applied in the field of filler modification, can solve the problems of unstable quality of modified filler, complicated modification process, and low production efficiency, and achieve uniform modification effect, simple process, and low cost Effect

Active Publication Date: 2018-07-27
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the liquid-phase method modification process has a complicated modification process and high cost; although the dry method modification process has the advantages of flexibility, simple process, and low cost, it is difficult to modify the filler during the modification process. Achieve uniform treatment; gas-phase modification treatment process is characterized by the modifier dispersed in the gas phase can be evenly adsorbed on the surface of the filler, the filler modification effect is stable, compared with liquid-phase treatment equipment, the modified powder does not need Drying treatment, but traditional gas phase treatment equipment is difficult to modify the surface of sub-micron or nano-scale fillers; for mechanochemical treatment process, due to the continuous pulverization of fillers during the modification process, new surfaces are generated, and the filler surface It is difficult to completely adsorb the modifier; the quality of the modified filler prepared by the high-energy radiation modification process is unstable, the production efficiency is low, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 5.0g of polydimethylsiloxane to a 25mL crucible; then place the above crucible in a stainless steel reaction kettle with a diameter of 4cm and a height of 8cm; then, place a crucible with an area of ​​3×3cm 2 1. A stainless steel mesh with a mesh number of 1000, spread 1g of graphene evenly on the stainless steel mesh; cover the lid of the stainless steel reaction kettle, put the reaction kettle in a muffle furnace at 300°C for 5 hours, and wait for the reaction system to cool to room temperature The organosilicon-modified graphene powder can be obtained.

[0025] Experiments further show that the organosilicon-modified graphene prepared by this method is basically consistent with the appearance of unmodified graphene, and has good hydrophobicity. Compared with pure graphene, modified graphene can be more stable. Dispersed in ethanol, isopropanol, acetone, 1,2-dichlorotoluene, N-methylpyrrolidone, dimethyl sulfoxide, N,N-dimethylformamide and other organic solvents,...

Embodiment 2

[0027] In the vacuum evaporation equipment, 100g of poly-p-phenylene imide ester is heated to 370°C for sublimation to form p-hydroxyisocyanate gas. Ceramics, reacted for 12 hours, during the process of cooling the reaction system to room temperature, part of the p-hydroxyisocyanate adsorbed on the surface of aluminum nitride and then polymerized to form poly-p-phenylene imide ester, thus obtaining poly-p-phenylene imide ester Modified aluminum nitride powder.

[0028] The experiment further shows that: the poly-p-phenylene imide modified aluminum nitride prepared by this method has good hydrolysis resistance; the composite material prepared by mixing 50vol.% modified aluminum nitride in the epoxy resin has the thermal conductivity The coefficient is as high as 2.03W / (m K), which is slightly smaller than the aluminum nitride / epoxy resin composite material (2.26W / (m K)) prepared under the same conditions. It can be seen that the thermal conductivity of boron nitride modified by...

Embodiment 3

[0030] Dissolve 10wt.% polyoxymethylene in dimethyl sulfoxide at 150°C, and spray the polyoxymethylene solution evenly on the porous alumina loaded with 1g of montmorillonite in a vacuum spraying device, and wait for the dimethyl sulfoxide to After the evaporation is complete, heat the polyoxymethylene to 280°C to depolymerize and form high-concentration formaldehyde gas. React for 30 minutes. When the reaction system is cooled to room temperature, part of the formaldehyde gas is adsorbed to the surface of the montmorillonite powder and polymerized to form polyoxymethylene, namely Polyoxymethylene modified montmorillonite powder can be obtained.

[0031] The experiment further shows that the water permeability of the composite material prepared by mixing 1wt.% modified montmorillonite in the epoxy resin is 1.72g m -2 the day -1 , the waterproof performance is better than that of the montmorillonite / epoxy resin composite prepared under the same conditions (2.91g m -2 the day ...

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Abstract

The invention discloses a filler modifying method and application thereof. The method comprises the following steps that (A) powdery fillers are uniformly unfolded and laid on the porous material surface; the powdery fillers are selected from carbon materials, metal materials, conductive polymers, and coating materials, nitrides, oxides, sulfide, hydrotalcite and silicate thereof; (B) a polymer orpolymer solution is added into an evaporation container; the polymer is selected from self heated polymers capable of being decomposed into free radicals, and polymers capable of being evaporated orsublimated after being heated or can be evaporated along with solvents; (C) on the basis of chemical vapor deposition, an vacuum evaporation method or a vacuum spray method, the materials in the evaporation container are heated; film formation molecules escape or extremely fine steam mist is formed; the formed steam is incident to the filter surface to form an ultrathin insulation thin film; the modified filter is obtained. The method has the advantages of high flexibility, simple process, low cost, uniform medication effect, stable filter performance and the like, and has wide application prospects in the fields of heat conduction composite materials and anti-corrosive paint.

Description

technical field [0001] The invention relates to a method for modifying fillers, which belongs to the technical field of particle surface modification. Background technique [0002] The surface modification treatment technology of fillers is a hot research field gradually developed with the rise of new composite materials. Although the development history is relatively short, the surface modification of fillers plays an important role in improving the dispersion of fillers and their compatibility with matrix materials. application is of great importance. Therefore, by controlling or changing the properties of the filler surface, it has an important effect on the preparation and application of composite materials. [0003] There are many surface modification treatments for fillers, mainly including liquid phase treatment, dry modification treatment, gas phase treatment, mechanochemical treatment, high energy radiation treatment, etc. Among them, the liquid-phase method modi...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K3/04C08K3/28C08K3/34
CPCC08K3/042C08K3/28C08K3/346C08K9/10C08K2003/282
Inventor 孙文刘贵昌王立达武婷婷杨政清
Owner DALIAN UNIV OF TECH
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