Method for preparing mixtures for abrasive articles

Abrasive tool making process – material – or composition – With synthetic resin

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51295, B24D 328

Patent

active

056118279

ABSTRACT:
An improved method for preparing a molding material for abrasive articles has been developed. The method includes the step of continuously blending an abrasive material with a curing agent and measured portions of two phenol-novolac resins, one of which has a phenol-formaldehyde molar ratio in the range of about 1:0.2 to 1:0.35. The blending composition can also include various other materials, such as fillers. The resulting product is a flowable, granular material homogeneously coated with the phenol-novolac resins. The product can be directly molded, i.e., without an aging step, into various abrasive articles, such as grinding wheels.
In another embodiment, either a continuous or discontinuous technique can be used to blend the phenol-novolac resins, and the molded product is then cold pressed or warm pressed at a pressing temperature less than about 140.degree. C.

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patent: 4099934 (1978-07-01), Suzuki et al.
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patent: 5399606 (1995-03-01), Konig et al.
J.F. Monk; Thermosetting Plastics, Chapter 3; "Compression Moulding of Thermosetting Materials"; pp. 41/71 (no date).
Kirk-Othmer Encyclopedia of Chemical Technology, Third Edition, vol. 17; "Phenolic Resins"; pp. 384/416 (no date).
Bakelite.sup.R publication; "Rutaphen.sup.R -Resins for Grinding Wheels-Technical Information" (KN 50E-09.92-G&S-BA) (no date).
Bakelite.sup.R publication: "Rutaphen.sup.R Phenolic Resins--Guide/Product Ranges/Application" (KN107/e-10.89 GS-BG) pp. 80/81 (no date).

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