GB748696A - Process of making abrasive phenolic resin mixes - Google Patents

Process of making abrasive phenolic resin mixes

Info

Publication number
GB748696A
GB748696A GB2309552A GB2309552A GB748696A GB 748696 A GB748696 A GB 748696A GB 2309552 A GB2309552 A GB 2309552A GB 2309552 A GB2309552 A GB 2309552A GB 748696 A GB748696 A GB 748696A
Authority
GB
United Kingdom
Prior art keywords
fluidizing
pressure
chamber
phenolic resin
passes
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
Application number
GB2309552A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Norton Grinding Wheel Co Ltd
Original Assignee
Norton Grinding Wheel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US252391A priority Critical patent/US2708622A/en
Priority to DED13101A priority patent/DE937730C/en
Application filed by Norton Grinding Wheel Co Ltd filed Critical Norton Grinding Wheel Co Ltd
Priority to GB2309552A priority patent/GB748696A/en
Priority to FR1068950D priority patent/FR1068950A/en
Publication of GB748696A publication Critical patent/GB748696A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24DTOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/28Resins or natural or synthetic macromolecular compounds
    • B24D3/285Reaction products obtained from aldehydes or ketones

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Moulding powders for making shell moulds or abrasive articles, e.g. grinding-wheels, and comprising granules of sand &c. wetted with a plasticizer and coated with a partially cured phenolic resin are prvented from sticking together by fluidizing the granules in a current of air or other gas at temperatures from 40-200 DEG C. In making the mixture sufficient plasticizer, e.g. furfural or liquid reactive phenolic resin is added to pick up nearly all the abrasive powder leaving 1 per cent free powder and the powdered phenolic resin is then added. In examples mixtures comprising 22.4 lbs. 24-grit size alumina, 0.52 lb. liquid resin and 1.78 lbs. solid resin are specified. This mixture is fed successively through hoppers 1, 9 and thence, by means of pressure supplied by air fed through line 21, through glass tube 12 and heater 13 to the upper chamber 31 of the fluidizing apparatus comprising a steel cylinder 35 divided into upper and lower chambers 31, 39 by a porous plate 41 and provided with electric heating coils 36. The lower chamber is cone-shaped and has an inlet pipe for the fluidizing gas while above the chamber 31 is provided a glass tube 73 in which the extent of the fluidizing action may be observed and from which passes a pipe 89 to a centrifugal separator 93 in which any powder carried over by the fluidizing gas is separated, the gas being vented through a receiver 98 containing water. Fluidizing gas is supplied under pressure from the mains 29, the pressure being sufficient to give the required differential pressure for the feed at points 14 and 43 respectively. The air <PICT:0748696/IV(a)/1> is first dried by passage through a glass wool filled trap 26 and then passes to the T-piece 22 where the supply is divided to feed the lines 21 and 68. The latter supply passes through a cylinder 61 containing a dehydrator, e.g. calcium sulphate, and thence through a ceramic pipe 48 fitted with resistance heating wires into the base of a cylinder 47 from the top of which the dried air passes through an electrically heated tubular heater 55, 56 into the base of the cone-shaped chamber 39. A mercury pressure gauge 103 connected on the one side through pipes 105, 106 to the upper chamber 35 and on the other side through pipes 102, 101 and T-union 100 to the lower chamber 39 enables the pressure differential to be controlled in conjunction with the temperature limit specified read off at thermometers 111 and thermocouple 109 that the level of the fluidized mixture is controlled to rise to the level of the outlet 77 from which catalyst is continually withdrawn through line 78 to receiver 80.
GB2309552A 1951-10-20 1952-09-15 Process of making abrasive phenolic resin mixes Expired GB748696A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US252391A US2708622A (en) 1951-10-20 1951-10-20 Process of making abrasive phenolic resin mixes
DED13101A DE937730C (en) 1951-10-20 1952-09-09 Process for producing a free-flowing, grainy abrasive mass
GB2309552A GB748696A (en) 1952-09-15 1952-09-15 Process of making abrasive phenolic resin mixes
FR1068950D FR1068950A (en) 1951-10-20 1952-10-06 Process for manufacturing abrasive mixtures based on phenolic resins

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2309552A GB748696A (en) 1952-09-15 1952-09-15 Process of making abrasive phenolic resin mixes

Publications (1)

Publication Number Publication Date
GB748696A true GB748696A (en) 1956-05-09

Family

ID=10190027

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2309552A Expired GB748696A (en) 1951-10-20 1952-09-15 Process of making abrasive phenolic resin mixes

Country Status (1)

Country Link
GB (1) GB748696A (en)

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