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Granular powder of modified polytetrafluoroethylene

A polytetrafluoroethylene and granular powder technology, which is applied in the field of modified polytetrafluoroethylene granular powder, can solve the problems of low dielectric breakdown voltage, tensile strength of PTFE granular powder and other physical properties of molded products that cannot fully meet the requirements, etc.

Inactive Publication Date: 2000-04-05
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, even if the method described in this patent publication is adopted, the physical properties of the molded product such as the tensile strength of the obtained PTFE granular powder cannot fully meet the requirements, and in order to obtain the final product, subsequent processes such as gelation and pulverization must be carried out.
In addition, the dielectric breakdown voltage of the molded product obtained by molding the granular powder is relatively low, and it cannot be used for applications requiring a dielectric breakdown voltage.
Also, as mentioned above, this method requires a crushing mechanism

Method used

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  • Granular powder of modified polytetrafluoroethylene
  • Granular powder of modified polytetrafluoroethylene
  • Granular powder of modified polytetrafluoroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0158] Put 120-150 liters of ion-exchanged water into a 200-liter granulation tank equipped with conical blades, and adjust the temperature to 20-28°C. The modified PTFE powder (polychlorofluorocarbon (Polyflon) M-111 produced by Daikin Co., Ltd. manufactured by suspension polymerization method) which is pulverized into an average particle diameter of 25 μm was added with 0.1% (mole) perfluoropropylene ethylene Base ether modification) 30kg is packed in the granulation tank. Then, while rotating the conical blade at a rotation speed of 400 rpm, 0.100% of a specific nonionic surfactant (Pronon #104 manufactured by NOF Co., Ltd.) was added. ), add 19.1kg of organic liquid CH after 2-3 minutes 2 Cl 2 . Continue stirring at a speed of 400rpm for 5 minutes to dissolve the organic liquid and PTFE powder, then pass the material in the granulation tank into the pipeline mixer outside the tank, and perform external circulation for 20 minutes. It takes 15 minutes to raise the tempe...

Embodiment 2-10

[0162] Change the amount and type of surfactant in Example 1 and the amount of the organic liquid forming the liquid-liquid interface with water to the amount shown in Table 1, and operate in the same way as Example 1 to obtain the improvement of the present invention Proprietary PTFE granular powder was tested in the same manner as in Example 1, and the results are shown in Table 1.

Embodiment 4

[0163] The nonionic surfactants used in Example 4 are as follows.

[0164] Puronen #208: Manufactured by NOF Co., Ltd.

[0165] With regard to the modified PTFE granular powder obtained in Example 3, a photograph of the particles in the powder was carried out in the following manner.

[0166] Particle shape: A photo was taken at 100 times or 200 times magnification using an optical microscope "TV microscope" manufactured by Sony Corporation.

[0167] The results are shown in figure 2 with image 3 middle.

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Abstract

A granular powder of a modified PTFE, which has a high apparent density, a small average particle diameter, a narrow particle size distribution, a charge amount of substantially zero, and a small angle of repose and is excellent in powder flowability and especially powder stability. A powder of a modified PTFE is granulated by stirring the PTFE in water in the presence of both an organic fluid forming a liquid-liquid interface with water and a nonionic surfactant comprising a segmental polyalkylene glycol having at least one hydrophobic segment and at least one hydrophilic segment. The granular powder can give molded articles having excellent tensile strength and elongation, a reduced surface roughness, and a high breakdown voltage and a high whiteness (Z value).

Description

technical field [0001] The present invention relates to a modified polytetrafluoroethylene (PTFE) granular powder with good powder properties, especially particle stability, and low charge. Background of the invention [0002] In the past, many proposals have been made regarding the production method of pulverizing PTFE powder obtained by suspension polymerization to an average particle diameter of 100 μm or less and then granulating it to obtain granular powder. For example, Japanese Patent Publication No. 44-22619 discloses a method of stirring and granulating PTFE powder in an aqueous medium at 30-150° C. containing a water-insoluble organic liquid with a boiling point of 30-150° C. [0003] In addition, in order to improve the method described in the above-mentioned patent publication, Japanese Patent Publication No. 57-15128 discloses a method using a device equipped with a crushing mechanism for PTFE powder. [0004] In addition, as a method of u...

Claims

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Application Information

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IPC IPC(8): C08F214/24C08J3/12C08J3/16C08L27/18
CPCB01J20/2805C08J3/12C08J2327/18B01J20/18
Inventor 浅野道男辻雅之
Owner DAIKIN IND LTD
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