Surface modification method of inorganic nanoparticles as well as polytetrafluoroethylene/inorganic nanoparticle composite material

An inorganic nanoparticle, polytetrafluoroethylene technology, applied in inorganic pigment processing, chemical instruments and methods, dyeing organosilicon compound processing, etc., can solve the mechanical properties decline of composite materials, the problem of dispersion is difficult to solve, and the interface bonding force is weak. and other problems, to achieve the effect of improving mechanical properties, good macro-mechanical properties, and strong interfacial bonding force

Inactive Publication Date: 2015-04-01
TIANJIN BINPU PRODIVITY PROMOTION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polytetrafluoroethylene has good corrosion resistance and is widely used in various occasions that require resistance to acids, alkalis and organic solvents. However, polytetrafluoroethylene also has many performance shortcomings, such as poor rigidity and low elasticity. In order to improve these shortcomings, improve polytetrafluoroethylene The comprehensive mechanical properties of vinyl fluoride require adding inorganic fillers to the PTFE matrix to prepare PTFE-based composite materials. Inorganic nanomaterials are the best inorganic fillers suitable for filling PTFE
There are two key problems in filling PTFE with inorganic nanoparticles: one is that the dispersion of inorganic nanoparticles in the PTFE matrix is ​​difficult to solve; the other is that the interface binding force between inorganic nanoparticles and PTFE matrix is ​​weak, lead to a serious decline in the mechanical properties of composite materials

Method used

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  • Surface modification method of inorganic nanoparticles as well as polytetrafluoroethylene/inorganic nanoparticle composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, add 5g of nano zinc oxide and 0.2g of polyethylene glycol 400 to 100mL of deionized water, ultrasonically disperse for 1 hour to form a suspension, and then add 0.05g of lanthanum nitrate and 0.05g of disodium edetate to the suspension , sonicate at room temperature for 10 minutes, let stand for 30 minutes, then add mercaptopropyltrimethoxysilane with a mass percentage of 1 g, stir for 10 minutes, let stand for 30 minutes, centrifuge, dry, grind to obtain modified inorganic nanoparticles, and finally Blend 5g of modified inorganic nanoparticles with 95g of polytetrafluoroethylene powder, put the blended material into a stainless steel mold, and mold it with a press to obtain a green body. The molding pressure is 28MPa, and the molding time is 20min. The molded body was placed in a muffle furnace for sintering at a temperature of 350° C. and a sintering time of 2 hours. After sintering, a polytetrafluoroethylene / inorganic nanoparticle composite material was obtaine...

Embodiment 2

[0023] First, add 5 g of nano-zinc oxide and 0.2 g of polyethylene glycol 400 in 100 mL of deionized water, ultrasonically disperse for 1 h to form a suspension, and then add 0.05 g of cerium nitrate and 0.05 g of ethylenediaminetetra Disodium acetate, ultrasonic at room temperature for 10 minutes, let stand for 30 minutes, then add mercaptopropyltrimethoxysilane with a mass percentage of 1g, stir for 10 minutes, let stand for 30 minutes, centrifuge, dry, and grind to obtain modified inorganic nano Particles, finally blend 2g modified inorganic nanoparticles with 98g polytetrafluoroethylene powder, put the blended material into a stainless steel mold, and mold it with a press to obtain a green body. The molding pressure is 28MPa, and the molding time is 20min , the molded green body is placed in a muffle furnace for sintering, the sintering temperature is 350 ° C, the sintering time is 2h, and the PTFE / inorganic nanoparticle composite material is obtained after sintering.

Embodiment 3

[0025] First, add 10 g of nano-zinc oxide and 0.5 g of polyethylene glycol 400 in 100 mL of deionized water, ultrasonically disperse for 1 hour to form a suspension, and then add 0.1 g of neodymium nitrate and 0.05 g of ethylenediaminetetra Disodium acetate, sonicate for 20 minutes at room temperature, let stand for 30 minutes, then add mercaptopropyltrimethoxysilane with a mass percentage of 1.3 g, stir for 10 minutes, let stand for 30 minutes, centrifuge, dry, and grind to obtain the modified inorganic Nanoparticles, finally blend 10g modified inorganic nanoparticles with 90g polytetrafluoroethylene powder, put the blended material into a stainless steel mold, and mold it with a press to obtain a green body. The molding pressure is 28MPa, and the molding time is After 20 minutes, the molded green body was placed in a muffle furnace for sintering, the sintering temperature was 350° C., and the sintering time was 2 hours. After sintering, the polytetrafluoroethylene / inorganic n...

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Abstract

The invention provides a surface modification method of inorganic nanoparticles as well as a polytetrafluoroethylene / inorganic nanoparticle composite material. The method comprises steps as follows: firstly, adding the inorganic nanoparticles and polyethylene glycol 400 to deionized water, and performing ultrasonic dispersion to form a suspension; then adding rare earth nitrate and ethylenediaminetetraacetic acid disodium to the suspension, leaving the solution to stand after ultrasonic treatment at the room temperature, then adding trimethoxysilylpropanethiol, leaving the solution to stand after stirring, and performing centrifugal separation, drying and grinding to obtain the modified inorganic nanoparticles; finally, mixing the modified inorganic nanoparticles with polytetrafluoroethylene powder, preparing a blank through compression molding, and sintering the blank to prepare the polytetrafluoroethylene / inorganic nanoparticle composite material. The surface modification method is simple in process, wide in application range and good in modification effect. The interface binding force of the modified inorganic nanoparticles to polytetrafluoroethylene is enhanced, and the comprehensive mechanical property of the composite material is excellent.

Description

technical field [0001] The invention belongs to the field of composite materials, and relates to a method for modifying the surface of inorganic nanoparticles and a polytetrafluoroethylene-based composite material thereof. Background technique [0002] Polytetrafluoroethylene has good corrosion resistance and is widely used in various occasions that require resistance to acids, alkalis and organic solvents. However, polytetrafluoroethylene also has many performance shortcomings, such as poor rigidity and low elasticity. In order to improve these shortcomings, improve polytetrafluoroethylene The comprehensive mechanical properties of vinyl fluoride require adding inorganic fillers to the PTFE matrix to prepare PTFE-based composite materials. Inorganic nanomaterials are the best inorganic fillers suitable for filling PTFE. There are two key problems in filling PTFE with inorganic nanoparticles: one is that the dispersion of inorganic nanoparticles in the PTFE matrix is ​​diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K9/04C08K9/06C08K9/02C08K3/22C08K3/36C08K7/24C09C3/12C09C3/10C09C3/08C09C3/06C09C3/04
CPCC08K9/08C08K3/22C08K3/36C08K7/24C08K9/02C08K9/04C08K9/06C08K2003/2227C08K2003/2241C08K2003/2296C08K2201/011C09C1/043C09C3/006C08L27/18
Inventor 孟庆昌刘延生
Owner TIANJIN BINPU PRODIVITY PROMOTION
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