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Polymer material and seals formed thereof for high pressure pump applications

A technology of seals and high-pressure pumps, applied in the parts of pumping devices for elastic fluids, engine seals, pump components, etc., can solve the problem of shortening pump life, affecting the separation of chemical components, blocking liquid chromatography columns, etc. question

Inactive Publication Date: 2011-11-16
SAINT GOBAIN PERFORMANCE PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, conventional seal materials can scratch the pump shaft, damage expensive pump components and shorten the life of the pump
In another example, conventional sealing materials may release particulate material into the liquid carrier medium, clogging the LC column and reducing the effectiveness of the HPLC system
In specific instances, the particulate material may act as an additional adsorption surface, thereby detrimentally affecting the separation of chemical components

Method used

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  • Polymer material and seals formed thereof for high pressure pump applications
  • Polymer material and seals formed thereof for high pressure pump applications
  • Polymer material and seals formed thereof for high pressure pump applications

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Blends were made with modified PTFE and cross-linkable PTFE powder in ratios of approximately 80-20, 70-30 and 50-50. These blends can be filled with one or more of boron nitride, carbon fibers, bronze, graphite fibers in addition to other fillers. These blends were compared to non-crosslinked modified PTFE (without crosslinkable PTFE powder).

[0031] Abrasion testing is performed according to ASTM D3702. For wear tests done using this method, the 50-50 (modified PTFE plus crosslinkable PTFE powder) blend showed substantially better results than non-crosslinked PTFE or modified PTFE. The wear rate of a 50-50 blend of modified PTFE plus cross-linkable PTFE powder appears to be orders of magnitude better than these virgin grades. High-speed spin tests also confirmed this finding.

[0032] Creep resistance was tested at higher temperatures according to ASTM-2990. Creep in compression was improved by a factor of 2 for a 50-50 blend of modified PTFE plus cross-linkable ...

example 2

[0034] For the following materials, wear and friction properties were tested.

[0035] Samples 1 and 2 = cross-linked PTFE and blends thereof

[0036] Sample 3 = glass filled PTFE / modified PTFE

[0037] Sample 4 = polymer filled PTFE / modified PTFE

[0038] Sample 5 = Mineral filled PTFE / modified PTFE

[0039] Sample 6 = carbon filled PTFE / modified PTFE

[0040] Sample 7 = standard material found in the market

[0041] These materials were tested using an ASTM D3072 thrust washer test. The test conditions for these materials are 100fpm and 0.7MPa (such as figure 2 Seen in ) and 100fpm and 2.8MPa (such as image 3 as seen in ). These results demonstrate that cross-linked PTFE (Sample 1) is able to achieve a low K-factor (wear) without increasing the coefficient of friction (COF). Typically, fillers in a material such as PTFE increase the coefficient of friction.

[0042] The results for the mechanical / physical tests can be found in Table 1. The test standard is determ...

example 3

[0046] In a simulated laboratory-level HPLC-like application, three samples were tested for leak rate. The leak rate was tested around a seal and a reciprocating shaft (1 Hz reciprocating rate) in a pressure chamber at a pressure of 100 MPa over a period of approximately 2 weeks. These samples and averaged results can be found at Figure 4 middle.

[0047] as in Figure 4 As shown in , cross-linked PTFE has a leak rate comparable to pigmented ultra-high molecular weight polyethylene (UHMWPE). However, PTFE has improved chemical resistance compared to polyethylene, which is limited by its solvent compatibility. In addition, the crosslinked PTFE has an improved leakage rate compared to carbon filled PTFE.

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Abstract

A seal is formed of a material including a crosslinked fluoropolymer. The seal substantially prevents leaks in a high pressure pump.

Description

technical field [0001] The present disclosure generally relates to polymeric materials and seals formed therefrom. Background technique [0002] Seals have traditionally been used to prevent fluid flow between the joints of rigid components. In particular examples, seals are used in the pump and between flanges to restrict fluid flow out of the contained area. For example, seals along the pump shaft may limit the escape of lubricating fluid or pressurized working fluid along an annulus defined by the shaft and a housing. Traditionally, these seals have been formed from malleable materials such as graphite or metal strips in the case of flange seals or elastomeric materials in the case of shaft seals. However, traditional materials have proven unsuitable for new applications, such as high-pressure liquid chromatography systems. [0003] High pressure rod driven pumps such as high pressure liquid chromatography use a high pressure liquid carrier medium to separate chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/32F16J15/18F16J15/16F04B53/18
CPCF04D29/10F16J15/3236G01N2030/326F16J15/3268F16J15/3276F04B53/144F16J15/3212F16J15/3284F04B39/041F05C2225/04
Inventor R·T·拉可克特J·M·勒恩赫特K·韦德斯沃兰C·克麦奥克斯
Owner SAINT GOBAIN PERFORMANCE PLASTICS CORP
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