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Compact inorganic micro powder membrane, its preparing method and products produced therefrom

A technology of inorganic micropowder and inorganic powder material, which is applied in electrode manufacturing, layered products, alkaline battery electrodes, etc., can solve the problem of difficulty in forming a uniform and dense structure, unfavorable for large-scale continuous preparation, and the impact of electrochemical response performance, etc. problems, to achieve the effect of convenient and easy processing, flexible use, and improved part performance

Inactive Publication Date: 2003-06-25
BEIJING MEILIYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the patent only uses dry mixing and dry pressing, it is difficult to mix evenly and form a uniform and dense structure
Simple dry mixing is also difficult to give full play to the bonding effect of PTFE, so a higher content of PTFE must be used to achieve a better bonding effect, and this will inevitably affect the electrochemical response performance of the material
In addition, there are many meshes and pores in the membrane prepared according to the patented method, and the density is too small (see Figure 2 and Figure 3), and the method of the patent is not conducive to large-scale continuous production, the adsorption capacity per unit volume is small, and the application is limited , not suitable for use as adsorption materials, such as hydrogen absorption membrane, liquefied petroleum gas adsorption membrane and natural gas adsorption membrane, etc.

Method used

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  • Compact inorganic micro powder membrane, its preparing method and products produced therefrom
  • Compact inorganic micro powder membrane, its preparing method and products produced therefrom
  • Compact inorganic micro powder membrane, its preparing method and products produced therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh 20 grams of activated carbon powder, the average particle size is 100 microns, the bulk density is 0.4 g / cm3, and the specific surface area of ​​the powder is 1200 m 2 / g, the average pore diameter is 2.86nm; Weigh 0.2 grams of polytetrafluoroethylene dispersed resin powder, particle diameter 450 microns. Add the above materials together into a high-speed mixing mixer, the reamer speed of the mixer is 1200 rpm, and stir for 10 minutes to form a fully mixed powder. The quality of the binder used at this moment is less than 1% of the total mass of the mixture.

[0041] Fill 150 ml of boiled deionized water, and pour the mixed powder into a high-torque low-speed mixing noodle machine at a speed of 200 rpm, and mix for 5 minutes. After mixing, it becomes cement. One can see the mesh situation (see Figure 4).

[0042] Put the cement-like mixture in the double-roller of a double-roller mill with a temperature of 80 degrees Celsius, and keep kneading for 5 minutes. Dur...

Embodiment 2

[0045] Weigh 20 grams of high specific surface activated carbon powder, with an average particle size of 50 microns, a bulk density of 0.4 g / cm3, and a specific surface area of ​​3050 m 2 / g; Weigh 0.2 grams of polytetrafluoroethylene dispersed resin powder, particle size 450 microns. Add the above materials together into a high-speed mixing mixer, the reamer speed of the mixer is 1200 rpm, and stir for 10 minutes to form a fully mixed powder. The quality of PTFE used at this time is less than 1% of the total mass of the mixture.

[0046] Perform the same operation as in Example 1 to obtain a strip, which is pressed to a thickness of 0.3 mm. The strip has a silky texture, no wet feeling, good self-sustaining force, and a compact structure.

[0047] The average pore diameter of the powder before processing is 2.37nm, and the hydrogen adsorption capacity is 7% by weight, that is, 100 grams of the adsorbent can absorb 7 grams of hydrogen. The prepared membrane has an average po...

Embodiment 3

[0050] The particle size is 30 nanometers and the bulk density is 0.0625g / cm 3 10 grams of nano-carbon powder and 0.2 grams of polytetrafluoroethylene dispersed resin powder with an average particle size of 450 μm. Add the above materials together into a high-speed mixing mixer, the reamer speed of the mixer is 1200 rpm, and stir for 10 minutes to form a fully mixed powder.

[0051] Perform the same operation as in Example 1 to obtain a strip, which is pressed to a thickness of 0.3 mm. The strip has a silk-like texture and a dense structure. Most of the water evaporates.

[0052] Experimentally measured, tensile strength: 4.2 grab sample breaking strength (N), density: 0.49g / cm 3 , is about 8 times the density of inorganic powder. The permeability of the membrane is 1.22×10 -6 L / (min.cm 2 Pa), the permeability coefficient is 1.80×10 -16 m 2 , the permeability is about 10,000 times smaller than that of general sintered metal materials.

[0053] As shown in Figure 9, bot...

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Abstract

The composite fine powder film consists of inorganic powdered material in 95-99.9 wt% and PTFE in 0.1-5 wt%. The composite film is prepared through dry mixing, wet mixing, pugging and other steps. The composite film may be used electrode material, adsorbing material, catalyst material, dielectric material and other material.

Description

technical field [0001] The invention relates to a dense inorganic micropowder film, its preparation method and the products obtained therefrom. In particular, the present invention relates to a dense inorganic micro-powder membrane bonded with a small amount of polytetrafluoroethylene, its preparation method and the products obtained therefrom. These articles can be used as electrode materials, dielectric materials, adsorption materials and catalyst materials, etc. Background technique [0002] As we all know, due to the low price and easy availability of raw materials, inorganic filled membranes containing inorganic substances such as carbon powder and silicon dioxide can be used in many fields. And it is known that a binder such as polytetrafluoroethylene (PTFE) or the like can be added to bind the inorganic powder together. PTFE has excellent properties such as chemical stability, high temperature stability, physical and mechanical properties, electrical insulation prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/04B32B5/16C08K3/04C08K3/18C08K3/22C08K3/26C08K3/34C08K3/40H01M4/04H01M4/24H01M4/36H01M4/38H01M4/48H01M4/485H01M4/62
CPCY02E60/122H01M4/38H01M4/485H01M4/364H01M4/623H01M4/04Y02E60/10
Inventor 李晓龙叶丽宁张永祥
Owner BEIJING MEILIYUAN TECH