Blend of fluorine-containing elastomers

A technology of elastomers and blends, applied in the field of fluoroelastomer blends, to achieve excellent processability, low modulus, and low hardness

Inactive Publication Date: 2017-10-17
UNIMATEC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in these patent documents, the improvement of extrudability is the subject, but as for specific applications, only fuel hoses for automobiles are described as typical applications.

Method used

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  • Blend of fluorine-containing elastomers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) After substituting and degassing the inside of a stainless steel autoclave with a capacity of 10 L with nitrogen, the following reaction medium was added.

[0058] Surfactant C. 3 f 7 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 8.5g

[0059] Na 2 HPO 4 ・12H 2 O 5.0g

[0060] Ion exchanged water 5000ml

[0061] After the inside of the autoclave was substituted with nitrogen again to degas it, the following reaction raw materials were added.

[0062] Vinylidene fluoride [VdF] 380g (56.0 mol%)

[0063] Hexafluoropropylene [HFP] 700g (44.0mol%)

[0064] Isopropyl alcohol [IPA] 2.0 g (0.065% by weight).

[0065] Next, the temperature in the autoclave was set to 80°C. At this time, it is 32 relative bars (32×10 5 Relative Pa) pressure. Ammonium persulfate [APS] 0.5 g (0.016% by weight) was added thereto as a 0.3% by weight aqueous solution to initiate a polymerization reaction. Keep the pressure at 31-32 relative bar (31-32×10 5 To the state of Pa), the followi...

Embodiment 2

[0081] (1) After substituting and degassing the inside of a stainless steel autoclave with a capacity of 10 L with nitrogen, the following reaction medium was added.

[0082] Surfactant C 3 f 7 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 19.3g

[0083] Na 2 HPO 4 ・12H 2 O 10.0g

[0084] Ion exchanged water 5200ml

[0085] After the inside of the autoclave was substituted with nitrogen again to degas it, the following reaction raw materials were added.

[0086] Vinylidene fluoride [VdF] 101g (34.3 mol%)

[0087] Tetrafluoroethylene [TFE] 49g (10.6 mol%)

[0088] Hexafluoropropylene [HFP] 380g (55.1mol%)

[0089] Isopropyl alcohol [IPA] 2.0 g (0.074% by weight).

[0090] Next, the temperature in the autoclave was set to 80°C. At this time, it is 30 relative bar (30×10 5 Relative Pa) pressure. Ammonium persulfate [APS] 0.8 g (0.030% by weight) was added thereto as a 0.3% by weight aqueous solution to initiate a polymerization reaction. Keep the pressure at 29-30 relati...

Embodiment 3

[0099] (1) After substituting and degassing the inside of a stainless steel autoclave with a capacity of 10 L with nitrogen, the following reaction medium was added.

[0100] Surfactant C 3 f 7 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 19.3g

[0101] Na 2 HPO 4 ・12H 2 O 10.0g

[0102] Ion exchanged water 5200ml

[0103] After the inside of the autoclave was substituted with nitrogen again to degas it, the following reaction raw materials were added.

[0104] Vinylidene fluoride [VdF] 101g (34.3 mol%)

[0105] Tetrafluoroethylene [TFE] 49g (10.6 mol%)

[0106] Hexafluoropropylene [HFP] 380g (55.1mol%)

[0107] 2-Bromo-1,1-difluoroethylene [BDFE] 8.3g

[0108] Octafluoro-1,4-diiodobutane [DIOFB] 3.0 g (0.111% by weight).

[0109] Next, the temperature in the autoclave was set to 80°C. At this time, it is 30 relative bar (30×10 5 Relative Pa) pressure. 1.0 g (0.037% by weight) of ammonium persulfate [APS] was added thereto as a 0.3% by weight aqueous solution to init...

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PUM

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Abstract

Provided is a fluorine-containing elastomer blend comprising 5 to 60 wt.% of a high-molecular-weight, fluorine-containing elastomer having a number average molecular weight of 3,000,000 or more, 20 to 80 wt.% of a medium-molecular-weight, fluorine-containing elastomer having a number average molecular weight of 100,000 to 1,000,000, and 10 to 50 wt.% of a low-molecular-weight, fluorine-containing elastomer having a number average molecular weight of 7,000 to 13,000; the number average molecular weight Mn of each tluorine-containing elastomer being measured by liquid chromatography using tetrahydrofuran as a developing solvent at a polymer concentration of 0.5 wt.% at a measurement temperature of 35 DEG C. The fluorine-containing elastomer blend can achieve low hardness and low modulus while improving roll processability.

Description

[0001] This application is a divisional application submitted based on the application dated October 19, 2011, the application number 201180052611.5, and the invention name "Fluoroelastomer Blend". technical field [0002] This invention relates to fluoroelastomer blends. More specifically, it relates to a fluoroelastomer blend suitable for sealing material molding applications due to the low hardness imparted to the vulcanized compound. Background technique [0003] In Patent Document 1, a compound having a specific multimodal molecular weight distribution and a specific molecular weight is described which contains a vinylidene fluoride unit [VdF], a hexafluoropropylene unit [HFP] and, if necessary, a tetrafluoroethylene unit [TFE]. Fluorine-containing elastomers are excellent in heat resistance, oil resistance, and chemical resistance, have little change in physical properties due to roll kneading, and are excellent in extrusion processability. [0004] Among them, in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08L27/16C08F14/22C08F214/22C08F214/28C08F214/26C08F2/26
CPCC08F14/22C08F214/22C08F214/222C08L27/12C08L27/16C08L2205/02C08L2205/025C08L2205/03C08F214/28C08F214/26C08F2/26C08L27/18C09K3/10C08L27/22
Inventor 林秀树前田满池田昭彦
Owner UNIMATEC CO LTD
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