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Sealing material

A sealing material and polymer technology, applied in structural parts, battery pack parts, lithium batteries, etc., can solve the problems of easy creep and unsuitable use.

Active Publication Date: 2014-07-23
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, fluororesins such as PTFE also have disadvantages such as easy creep phenomenon in the material, and are not suitable for use on parts to which a large load is applied. Various attempts have been made to use fluororesins as sealing materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0097] 26.6 parts of decarbonated and demineralized water was put into a jacketed autoclave equipped with a stirrer and capable of holding 174 parts of water. The space inside the autoclave was sufficiently replaced with pure nitrogen gas and evacuated, and 30.4 parts of perfluorocyclobutane (hereinafter referred to as "C-318"), 0.6 parts of methanol as a chain transfer agent, and 0.5 parts of PPVE were introduced. Next, while stirring, the inside of the autoclave was maintained at 35°C, and TFE was press-fitted so that the internal pressure was 0.58 MPaG. 0.010 part of di-n-propyl peroxydicarbonate (hereinafter referred to as "NPP") as a polymerization initiator was added to initiate polymerization. As the polymerization progressed, the pressure in the autoclave dropped, so TFE was pressed in to maintain the internal pressure at 0.58 MPaG. In addition, PPVE was added appropriately to make the polymerization composition uniform.

[0098] After 7.1 hours from the start of the po...

Synthetic example 2～11

[0106] Except that the amount of reactants and the reaction time were changed as shown in Table 1, pellets of the polymer product were produced in the same manner as in Synthesis Example 1.

[0107] For the obtained particles, the copolymer composition (PPVE ratio), melting point, MFR and weight average molecular weight were measured. The results are shown in Table 1.

[0108]

Embodiment 1

[0110] The pellets of the polymer product obtained in Synthesis Example 1 were preheated at 350°C for 1 hour, then pressed at 1 MPaG for 1 minute to form a sheet with a thickness of 20 mm, and cooled to room temperature naturally to obtain a sample sheet.

[0111] Cutting the above sample pieces into Use this as a test piece.

[0112] The resilience rate of the above test piece was measured according to the above method. The results are shown in Table 2.

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Abstract

The objective of the present invention is to provide a sealing material that can retain superior compression recovery properties even in harsh environments and that can maintain the airtightness and fluid-tightness of a vessel. The sealing material, which comprises a fluorine-containing polymer having a polymerization unit that is on the basis of tetrafluoroethylene and at least one type of polymerization unit that is on the basis of perfluoro(alkyl vinyl ether), is characterized by the fluorine-containing polymer having no greater than 4.0 mass% of the polymerization unit that is on the basis of perfluoro(alkyl vinyl ether) with respect to all the polymerization units, and having a melt flow rate of 0.1-100 g / 10 minutes.

Description

Technical field [0001] The present invention relates to sealing materials. More specifically, the present invention relates to an electrolyte sealing material that can be suitably used for secondary batteries such as lithium ion secondary batteries. Background technique [0002] Non-aqueous power storage devices (non-aqueous electrolyte secondary batteries such as lithium ion secondary batteries, non-aqueous electric double layer capacitors, etc.) usually adopt a sealing material to seal the opening of the battery can containing the positive electrode, the negative electrode, and the electrolyte. Form a closed structure. From the viewpoint of preventing short circuit between the positive electrode and the negative electrode, the battery can and the sealing member need to be electrically insulated. In addition, in order to prevent leakage of electrolyte and other contents, and to prevent the intrusion of air and moisture from the outside, the non-aqueous electrolyte secondary ba...

Claims

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Application Information

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IPC IPC(8): C08F214/26H01M2/08H01M50/193H01M50/198
CPCC08F214/262H01M10/052Y02E60/10H01M50/193H01M50/198C08F214/26C08L27/18
Inventor 青山高久河野英树今村均泽木恭平助川胜通
Owner DAIKIN IND LTD
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