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Sealing material

A technology of sealing materials and polymers, applied in structural parts, battery pack parts, lithium batteries, etc., can solve problems such as easy creep and unsuitable use

Active Publication Date: 2016-08-24
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 were charged into a jacketed autoclave equipped with a stirrer and capable of holding 174 parts of water. The space inside the autoclave was fully replaced with pure nitrogen and then 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 charged. Next, the inside of the autoclave was kept at 35° C. while stirring, and TFE was injected so that the internal pressure was 0.58 MPaG. 0.010 parts of di-n-propyl peroxydicarbonate (hereinafter referred to as "NPP") was added as a polymerization initiator to initiate polymerization. As the polymerization progressed, the pressure in the autoclave decreased, so TFE was injected to maintain the internal pressure at 0.58 MPaG. In addition, PPVE was appropriately added in order to make the polymerization composition uniform.

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

Synthetic example 2～11

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

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

[0108]

Embodiment 1

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

[0111] The above samples were cut into This was used as a test piece.

[0112] The rebound rate of the above-mentioned test piece was measured according to the above-mentioned method. The results are listed in Table 2.

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Abstract

An object of the present invention is to provide a sealing material capable of maintaining excellent compression resilience and maintaining airtightness and liquid-tightness of a container even in harsh environments. The present invention is a sealing material composed of a fluoropolymer having tetrafluoroethylene-based polymerized units and one or more perfluoro(alkyl vinyl ether)-based polymerized units, characterized in that , the perfluoro(alkyl vinyl ether)-based polymerized units in the fluoropolymer are 4.0 mass % or less with respect to the total polymerized units, and the melt flow rate of the fluoropolymer is 0.1 g / 10 minutes to 100g / 10 minutes.

Description

technical field [0001] The present invention relates to sealing materials. More specifically, the present invention relates to an electrolyte solution sealing material that can be suitably used for secondary batteries such as lithium ion secondary batteries. Background technique [0002] Non-aqueous electrical storage devices (non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries, non-aqueous electric double-layer capacitors, etc.) are usually sealed by sealing the opening of the battery tank that contains the positive electrode, negative electrode, and electrolyte solution. form a closed structure. From the viewpoint of preventing a short circuit between the positive electrode and the negative electrode, it is necessary to electrically insulate the battery can body and the sealing material. In addition, non-aqueous electrolyte secondary batteries are required to have high air-tightness and liquid-tightness in order to prevent leakage of conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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