Crosslinkable polytetrafluoroethylene composition, cross-linked polytetrafluoroethylene powder, polytetrafluoro-ethylene moldings, resin blend compositions, and resin blend moldings

A technology of polytetrafluoroethylene and composition, which is applied in the field of polytetrafluoroethylene resin and polytetrafluoroethylene composition, can solve problems such as wrinkles, lack of improved performance, difficult compression molding, etc., and achieve the effect of not being easily deformed

Inactive Publication Date: 2008-04-30
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the method of "mixing additives or carbon fibers", not only may anisotropy appear in various physical properties of the molded article of PTFE resin, but also may adversely affect the surface properties (low friction, etc.) of PTFE resin
And, it is reported that according to the method of "irradiating ionizing radiation to PTFE resin to make it cross-linked", a PTFE resin with low abrasion properties can be obtained, but the problem in the PTFE resin molded body obtained by this method is that due to PTFE The main chain is cut by ionizing radiation to cause a decrease in strength and a decrease in crystallinity, and there are also problems such as non-uniformity of crosslinking due to crosslinking of the non-crystalline part first, which is a problem originating from the radiation crosslinked product itself
Therefore, there is a problem that expensive equipment must be used in order to adopt this method
Moreover, in this method, in terms of the structure of the device, it is difficult to uniformly irradiate the PTFE molded body with ionizing radiation. In the case of powder, there will be a problem that the cross-linked structure is introduced unevenly. There will be problems such as wrinkles
In addition, in the case of crosslinking by heat, the effect of improving properties is lacking
[0009] Also, in the method of "crosslinking PTFE with fluorinated pitch", there are toxic HF gas and F in the crosslinking reaction. 2 gas etc.
And, as shown in JP-A-2001-240682, JP-A-2002-114883, etc., in the compression molding of the crosslinked PTFE powder (hereinafter referred to as crosslinked PTFE powder) obtained above, only the crosslinked Compression molding of PTFE powder is difficult, so there are problems that it needs to be mixed with uncrosslinked PTFE before compression molding, if the content of crosslinked PTFE is increased, it is difficult to compression Problems such as poor productivity caused by the hot sizing method of pressing and cooling at a temperature above

Method used

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  • Crosslinkable polytetrafluoroethylene composition, cross-linked polytetrafluoroethylene powder, polytetrafluoro-ethylene moldings, resin blend compositions, and resin blend moldings
  • Crosslinkable polytetrafluoroethylene composition, cross-linked polytetrafluoroethylene powder, polytetrafluoro-ethylene moldings, resin blend compositions, and resin blend moldings
  • Crosslinkable polytetrafluoroethylene composition, cross-linked polytetrafluoroethylene powder, polytetrafluoro-ethylene moldings, resin blend compositions, and resin blend moldings

Examples

Experimental program
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Effect test

preparation example Construction

[0215] [Preparation method of PTFE cross-linked powder]

[0216] The powder of the PTFE cross-linked body of the present invention can be obtained by treating under suitable and appropriate conditions. For example, in the case of oxazole cross-linking, the powder of the cross-linkable PTFE composition or cross-linked PTFE is put into an air circulation furnace and kept at 120-320° C. for 1-300 minutes to obtain a cross-linked PTFE. Furthermore, in the case of imidazole crosslinking, a crosslinked PTFE body with good physical properties can be obtained at a relatively low crosslinking temperature (for example, 120 to 280° C., preferably 120 to 250° C.). In addition, the heating temperature may be changed stepwise without being fixed. For example, a method may be considered in which the crosslinking agent is kept at a temperature near the melting point of the crosslinking agent, the crosslinking agent is sufficiently impregnated with PTFE, and then the temperature is raised to ...

Embodiment

[0258] (1) Manufacturing method of PTFE having reactive functional groups

Synthetic example 1

[0260] 3560 g of deionized water, 94 g of paraffin wax and 5.4 g of perfluorooctanoic acid ammonium dispersant were added to a stainless steel reactor with an internal capacity of 6 L and a stirrer. Next, while heating the contents of the reactor to 70° C., while evacuating, purging with TFE monomer was performed to remove oxygen in the reactor. Then, 0.17 g of ethane gas and 16.6 g of perfluorobutenoic acid (PFBA) were added to the reactor, and the contents were stirred at a speed of 280 rpm. TFE monomer was added to the reactor until the pressure was 0.73 MPa. 0.36 g of ammonium persulfate (APS) initiator dissolved in 20 g of deionized water was injected into the reactor so that the pressure of the reactor was 0.83 MPa. After injection of the initiator, a drop in pressure was observed and polymerization started. Add TFE monomer into the reactor, and keep the pressure to continue polymerization until about 1.1Kg of TFE monomer has reacted completely. Then, the reactor was ...

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Abstract

The invention aims at providing a PTFE resin which can be molded by a conventional process such as compression molding without expensive equipment or hot-coining of low productivity and little generates toxic substance during the molding and which retains the strength, crystallinity and surface characteristics inherent in conventional PTFE resins and exhibits isotropy, uniformity, and less deformation than those of conventional PTFE resins. The crosslinkable polytetrafluoroethylene composition comprises a polytetrafluoroethylene and a crosslinking agent. The polytetrafluoroethylene has at least one reactive functional group selected from the group consisting of cyano (-CN), carboxyl (-COOH), alkoxycarbonyl (-COOR (wherein R is a monovalent organic group)), and acid halide groups (-COX (wherein X is halogen)) at the end of at least either of the backbone chain and the side chain. The crosslinking agent can react with one or more of the reactive functional groups to form a ring structure.

Description

technical field [0001] The present invention relates to a polytetrafluoroethylene composition capable of forming a crosslinked structure and a polytetrafluoroethylene resin having a crosslinked structure. Furthermore, the present invention relates to a resin mixture composition containing a polytetrafluoroethylene composition or a polytetrafluoroethylene resin having a crosslinked structure. Furthermore, the present invention also relates to a resin mixture molded article obtained from the resin mixture composition. Background technique [0002] Polytetrafluoroethylene (hereinafter referred to as PTFE) resin has excellent performance in chemical resistance, friction resistance, weather resistance, electrical insulation, flame retardancy, etc. It is used as a sliding material, flame retardant additive, low dielectric constant film materials are widely used. However, PTFE resin has a problem of large wear and creep in a sliding environment or a high-temperature compression e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K5/16
Inventor 难波义典高明天泽田又彦
Owner DAIKIN IND LTD
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