Blend of fluorine-containing elastomers

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

Active Publication Date: 2013-06-26
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

[0056] (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.

[0057] Surfactant C. 3 f 7 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 8.5g

[0058] Na 2 HPO 4 ?12H 2 O 5.0g

[0059] Ion exchanged water 5000ml

[0060] After the inside of the autoclave was substituted with nitrogen again to degas it, the following reaction raw materials were added.

[0061] Vinylidene fluoride [VdF] 380g (56.0 mol%)

[0062] Hexafluoropropylene [HFP] 700g (44.0mol%)

[0063] Isopropyl alcohol [IPA] 2.0 g (0.065% by weight).

[0064] 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

[0080] (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.

[0081] Surfactant C 3 f 7 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 19.3g

[0082] Na 2 HPO 4 ?12H 2 O 10.0g

[0083] Ion exchanged water 5200ml

[0084] After the inside of the autoclave was substituted with nitrogen again to degas it, the following reaction raw materials were added.

[0085] Vinylidene fluoride [VdF] 101g (34.3 mol%)

[0086] Tetrafluoroethylene [TFE] 49g (10.6 mol%)

[0087] Hexafluoropropylene [HFP] 380g (55.1mol%)

[0088] Isopropyl alcohol [IPA] 2.0 g (0.074% by weight).

[0089] 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

[0098] (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.

[0099] Surfactant C 3 f 7 OCF (CF 3 ) CF 2 OCF (CF 3 )COONH 4 19.3g

[0100] Na 2 HPO 4 ?12H 2 O 10.0g

[0101] Ion exchanged water 5200ml

[0102] After the inside of the autoclave was substituted with nitrogen again to degas it, the following reaction raw materials were added.

[0103] Vinylidene fluoride [VdF] 101g (34.3 mol%)

[0104] Tetrafluoroethylene [TFE] 49g (10.6 mol%)

[0105] Hexafluoropropylene [HFP] 380g (55.1mol%)

[0106] 2-Bromo-1,1-difluoroethylene [BDFE] 8.3g

[0107] Octafluoro-1,4-diiodobutane [DIOFB] 3.0 g (0.111% by weight).

[0108] 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 blend of fluorine-containing elastomers comprising 5-60 wt% of a high-molecular-weight fluorine-containing elastomer having a number average molecular weight Mn (liquid chromatography, a tetrahydrofuran developing solvent, a polymer concentration of 0.5 wt%, a measurement temperature of 35 DEG C) of 3,000,000 or more, 20-80 wt% of a middle-molecular-weight fluorine-containing elastomer having an Mn of 100,000-1,000,000, and 10-50 wt% of a low-molecular-weight fluorine-containing elastomer having a Mn of 7,000-13,000. The blend of fluorine-containing elastomers achieves low hardness and low modulus, as well as an improved rolling processability.

Description

technical field [0001] 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 [0002] 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. [0003] Among them, in the method of making the molecular weight distribution into a multimodal type consisting of two or more peaks to achieve both physical properties and extrusion processability described in Patent Document...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/12C08L27/16C08L27/18C08L27/20
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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