US3875021A - Method and means of sensing characteristics of a bath - Google Patents
Method and means of sensing characteristics of a bath Download PDFInfo
- Publication number
- US3875021A US3875021A US312198A US31219872A US3875021A US 3875021 A US3875021 A US 3875021A US 312198 A US312198 A US 312198A US 31219872 A US31219872 A US 31219872A US 3875021 A US3875021 A US 3875021A
- Authority
- US
- United States
- Prior art keywords
- bath
- immersed
- latex
- electrode
- nylon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/38—Cleaning of electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S528/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S528/931—Physical treatment of natural rubber or natural rubber containing material or chemical treatment of non-rubber portion thereof, e.g. extraction of rubber from milk weed
- Y10S528/934—Latex
- Y10S528/936—Coagulating
Definitions
- the invention is herein illustrated in connection with the coagulation bath in a synthetic rubber process.
- An electrode or electrodes for sensing the pH of the bath, electrode protecting tubes, and a support therefor are immersed in the bath. While many materials have been tried for this purpose we have found that certain materials, specifically, nylon 6, nylon 7, nylon 66, nylon 6/10, glass and porcelain exhibit exceptional resistance to accumulation of suspended substance when used in various types of aqueous baths. All of these materials are surface wettable or hydrophilic, that is, receive a protective coating of water in the bath either by absorptive, adsorptive, or electrostatic action, such coating or wetting protecting the support and protective structures from adhesion of the suspended substance. Other wettable or hygroscopic nylons may be used in constructing the self-cleaning probe, protective sleeve, and support body.
- FIG. 1 is a schematic, partially exploded representation of a portion of an industrial process illustrating the invention.
- FIG. 2 is a side view of one form of the novel sensing electrode device, part being in longitudinal center section and part being in elevational and in exploded relationship.
- FIG. 1 illustrates schematically a coagulation tank 5 and associated parts constituting a part of the apparatus for manufacturing butadiene-styrene synthetic polymers by the emulsion process.
- the tank is charged through a line 6 with latex, that is, a colloidal dispersion of synthetic polymer particles as a soap stabilized em ulsion.
- latex that is, a colloidal dispersion of synthetic polymer particles as a soap stabilized em ulsion.
- Sodium chloride is added to line 6 through line 7, and dilute sulphuric acid is added as a lto lO-percent solution to the tank through line 8 having a control valve 9 therein.
- Valve 9 is automatically actuated by means of a fluid or other type of motor 10 driven from a control instrumentality ll.
- the pH sensing device 12 Suspended from instrumentality 11, or a suitable support, is the pH sensing device, generally designated 12, which is normally submerged in the rubber crumb slurry in the tank and is electrically connected to control instrumentality II by wiring and conduit structure 13.
- An agitating impeller 14 is suspended in the tank at a distance of from l0 to 14 inches below sensor I2 and is driven by motor means 15.
- the novel pH sensor device I2 is illustrated in detail in FIG. 2.
- the device comprises a base or body part 18, a pair of commercial pH sensing probes (electrodes) 19 and 20, protector tubes 21 and 22, and packing and securing bushings 23 and 24.
- Body 18 has a threaded socket 26 at its upper end for attachment to a support and is continued downwardly in branched passages 27 and 28 with cental restrictions 29 and 30 and enlarged lower portions 31 and 32 terminating in threaded sockets 33 and 34.
- a threaded socket 26 at its upper end for attachment to a support and is continued downwardly in branched passages 27 and 28 with cental restrictions 29 and 30 and enlarged lower portions 31 and 32 terminating in threaded sockets 33 and 34.
- Snugly but slidably received in passage portions 31 and 32, in the assembly, are the insulating upper extremities 35 and 36 of sensor probes I9 and 20 having basal flanges 37 and 38 and from which project the wires 39 and 40. These wires extend through passages 27, 28, and 26 and support 13 to control instrumentality 11.
- this wiring extends to conductor means exposed at the bottom extremities 41, 42 of the glass bodies of the probes for passing an electrical current through the ambient fluid, while instrumentality II senses and displays the resistance in the circuit, including the fluid intervening between conductor means 41, 42 as an indicator of the pH rating of such fluid.
- instrumentality II senses and displays the resistance in the circuit, including the fluid intervening between conductor means 41, 42 as an indicator of the pH rating of such fluid.
- lnstrumentality II controls valve 9 for adjusting the feed of the concentrated acid so as to maintain the pH of the colloidal dispersion in the tank substantially uniform as is necessary for optimum coagulation of the rubber particles therein.
- Probes 19 and 20 depend from sockets 33 and 34 and are surrounded by protector tubes 21 and 22 having top flanges 43 and 44 which seat upon electrode flanges 37 and 38.
- the electrode flanges are urged against shoulders 45 and 46 at the upper ends of sockets 33 and 34 by means of packing nuts or bushings 23 and 24 bearing against protector flanges 37 and 38 with the intervention of O-ring seals 47 and 48.
- the bushings are externally threaded for firm securement in sockets 33 and 34 and have polygonal lower extremities 49 and 50 for engagement by a tool if necessary in threading the bushings in place.
- probes l9 and as commercially available are glass encased, glass as a material for constructing body 18 is generally impractical and has not been used.
- there have been operational periods of buildups of latex on the electrodes and support and of decreasing pH sensitivity so that it has been necessary to withdraw the sensing device from the coagulation tank at intervals to permit removal of the latex adherent.
- nylons are wettable, i.e., hygroscopic.
- Other wettable or hygroscopic nylons may be used in constructing the support body and/or sensing electrode and its protective sleeve.
- Protector tubes and attchment bushings also may be constructed ofthis material. However, we have found Pyrex glass as supplied by Corning Glass Works to be particularly ef fective as protector material.
- the most desirable materials found for construction ofthe body are the nylon 6, nylon 7, nylon 66,
- the method of resisting buildup of latex and coagulum on and about said electrode comprising the step of constructing at least the surface portions of both said immersed electrode and said immersed body entirely of one or more of the selfcleaning materials of porcelain, glass, and wettable nylon.
- the method of resisting buildup of latex and coagulum on and about said electrode comprising the step of constructing at least the surface portions of said immersed electrode and said immersed body entirely of one or more of the self-cleaning materials of the class consisting of nylon 6, nylon 6/6, nylon 6/10, porcelain, and glass.
- the method of sensing the pH of the aqueous latex coagulation bath in a synthetic rubber process comprising the step of immersing in the bath a pH sensing probe and a support body therefor both having their surfaces exposed to the bath constructed of one or more of the self-cleaning materials of the class consisting of porcelain, glass, and wettable nylon to resist the adherence of latex and coagulum thereto.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US312198A US3875021A (en) | 1970-10-29 | 1972-12-04 | Method and means of sensing characteristics of a bath |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8499370A | 1970-10-29 | 1970-10-29 | |
US312198A US3875021A (en) | 1970-10-29 | 1972-12-04 | Method and means of sensing characteristics of a bath |
Publications (1)
Publication Number | Publication Date |
---|---|
US3875021A true US3875021A (en) | 1975-04-01 |
Family
ID=26771652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US312198A Expired - Lifetime US3875021A (en) | 1970-10-29 | 1972-12-04 | Method and means of sensing characteristics of a bath |
Country Status (1)
Country | Link |
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US (1) | US3875021A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US886650A (en) * | 1905-05-29 | 1908-05-05 | Charles B Schoenmehl | Battery cover and element support. |
US973645A (en) * | 1909-02-10 | 1910-10-25 | Gen Electric | Lightning-arrester. |
US2986511A (en) * | 1957-08-27 | 1961-05-30 | Cambridge Instr Company Inc | Apparatus for measuring the ph of solutions |
-
1972
- 1972-12-04 US US312198A patent/US3875021A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US886650A (en) * | 1905-05-29 | 1908-05-05 | Charles B Schoenmehl | Battery cover and element support. |
US973645A (en) * | 1909-02-10 | 1910-10-25 | Gen Electric | Lightning-arrester. |
US2986511A (en) * | 1957-08-27 | 1961-05-30 | Cambridge Instr Company Inc | Apparatus for measuring the ph of solutions |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: UNIROYAL TIRE COMPANY, INC., WORLD HEADQUARTERS, M Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SYNPOL INC. A DE. CORP.;REEL/FRAME:004585/0084 Effective date: 19860730 Owner name: UNIROYAL TIRE COMPANY, INC.,CONNECTICUT Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SYNPOL INC. A DE. CORP.;REEL/FRAME:004585/0084 Effective date: 19860730 |
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Owner name: UNIROYAL GOODRICH TIRE COMPANY THE, 600 SOUTH MAIN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNIROYAL TIRE COMPANY, INC., A CORP OF NJ.;REEL/FRAME:004665/0643 Effective date: 19860801 |
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Owner name: FIRST NATIONAL BANK OF CHICAGO, THE Free format text: SECURITY INTEREST;ASSIGNOR:UNIROYAL GOODRICH TIRE COMPANY, THE;REEL/FRAME:005004/0169 Effective date: 19880623 |
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Owner name: UGTC, INC., 600 SOUTH MAIN STREET, AKRON, OH 44397 Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNIROYAL GOODRICH TIRE COMPANY, THE;REEL/FRAME:005617/0501 Effective date: 19901031 |
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Owner name: UNIROYAL GOODRICH TIRE COMPANY, THE Free format text: CHANGE OF NAME;ASSIGNOR:UGTC, INC.;REEL/FRAME:006002/0042 Effective date: 19901101 |
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Owner name: MICHELIN FINANCE (PAYS-BAS) Free format text: SECURITY INTEREST;ASSIGNOR:FIRST NATIONAL BANK OF CHICAGO, THE;REEL/FRAME:006169/0591 Effective date: 19911209 |
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Owner name: UNIROYAL GOODRICH TIRE COMPANY, THE, OHIO Free format text: PARTIAL RELEASE;ASSIGNOR:MICHELIN FINANCE (PAYS-BAS) B.V.;REEL/FRAME:006401/0055 Effective date: 19911231 |
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Owner name: UNIROYAL GOODRICH INTELLECTUAL PROPERTY, INC., DEL Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNIROYAL GOODRICH TIRE COMPANY, THE;REEL/FRAME:006539/0805 Effective date: 19911231 |
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AS | Assignment |
Owner name: UNIROYAL GOODRICH LICENSING SERVICES, INC., DELAWA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNIROYAL GOODRICH INTELLECTUAL PROPERTY, INC.;REEL/FRAME:006674/0487 Effective date: 19920102 |