Патент USA US2071523код для вставки
Patented Feb. 23, 1937 I 2,071,523 UNITED ‘STATES OFFICE PATENT 2,071,523 PREPARATION OF ARTIFICIAL RESm COM PRESSION LIIXTURES Richard Hessen, Bautzen, Germany ‘No Drawing. Application March 25, 1931, Serial ' No. 525,332. In Germany March 27, 1930 2 Claims. v(o1. 106-22) example, becarried out by spreading out the mix It is known to prepare arti?cial resin com pression mixtures, i. e. intimate mixtures of ture in a thin layer on a‘ plate, thereafter sub jecting the mixture to a high pressure with the aid of a second plate, heating for a short time arti?cial resins, particularly soluble and fusible condensation products of phenols and formalde 6 hyde, capable of being hardened, and ?lling sub and then rapidly cooling down the mixture, whilst releasing the pressure. The process may also be advantageously carried out by forcing the above described mixture through nozzles stances, particularly wood powder, by intimately mixing or kneading resols, either in liquid or ?nely powdered condition, or in the form of an heated to high temperatures. Uniform mixing and impregnation of the resin and the ?lling 10 substance thereby takes place in the nozzle. alcoholic solution, with ?lling substances. 10 In the solvent-process the solvents are removed by heating and the solid mass compressed in a granulated or powdered form in known manner. The conditions, according to which this treat ment takes place, must be so chosen that fusion of the resin takes place in the entire layer whilst Working with solvents has the disadvantage that these solvents adhere‘extremely fast to the mix-' 15 ture and can only be, expelled by long heating. This long heating, however, reduces the ?owing ‘the outer layers, by employing suitable tempera tures, are prevented from passing over into the ?nal condition, so that the material after im properties of the ?nished compression mixtures to an extraordinary degree. On the other hand ' pregnation can still be compressed in any desired if this long heating is omitted the material, ow As ?lling materials there may be employed 20 20 ing to'tho retention of the solvent in the com _ pression mixture, can only be compressed with wood powder, ?brous substances of every kind, great di?iculty, since vapours are given off and mineral ?lling substances, such as asbestos, talc, manner. , consequently blisters form and it is therefore im- ' lithopone, magnesia, etc. possible to obtain high value compressed articles. The mixing process on rollers, on the other 25 hand, has the disadvantage that, on mixing the ‘ . ' Parts by weight powdered) _________________________ __‘._. 45 resin also takes place at the same time, whereby Wood powder ________ _-- ________________ .._ 50 it becomes extremely di?icult to hit the ex Lacquer black __________________________ __ 1.3 Talc _____________ _'_ ______________ __,__..__ 3 mixed and su?icient condensation has taken place. In this case also it is extremely di?icult to obtain uniform compression mixtures having 'the' desired ?owing properties and permanence of compression. , Stearin so v0.’! are intimately mixed ina mill and the mixture desired shape and of suitable length heated to 35 about 200° C. After cooling the mixture may, if ‘ desired, be powdered. densed to any desired degree and are also com pletely homogeneously mixed, can be prepared What I claim is:— y ‘ _ ' - 1. A process for preparing a consolidated com-' pression mixture which is capable of press 40 mouldinginto shapes and hardening, and is of without difficulty by bringing together ?nely powdered, suitably precondensed resin and suit, able quantities of ?nely powdered ?lling mate rial, if desired with the addition of pigments and agents for preventing'adhesion- to the matrices, _______ __' ______________________ __ rapidly forced through narrow nozzles of any According to this invention it has been found that compression mixtures, which are precon v uniform quality and comprises an arti?cial resin in resol form homogeneously mixed with and im ' pregnating a porous solid ?lling material, which intimately mixing the ingredients together in a comprises bringing together ?nely powdered pre suitable apparatusfor example a mill, ‘and there condensed resin in resol form with ?nely powdered after subjecting the mixture for a short time at a high temperature to a high compression pres- _ sure, after which the pressure is rapidly released 50 and the temperature lowered. This treatment has the purpose and effect of bringing the resin, owing to the high temperature, into a liquidform and at the same time forcing the resin into the ‘ 45 porous ?lling materialin the absence of resin solvent and thereby forming an intimate dry powdery mixture, subjecting the‘ mixture for a short'time to a high compression pressure at a 50 high temperature andthereby uniformly liquefy ing the rennin the presence of the ?lling ma‘ terial so that the lique?ed resin under saidv pres ?nest pores of the ?lling material owing to the . sure permeates and impregnates the pores of the 55 high pressure produced. This treatment can, for 25 ' Resol (suitably precondensed and very ?nely _ 30 act point when the product is homogeneously 40 I Example material together, a further condensation of the 35 . ?ller, and rapidly cooling and releasing the pres 65 2 2,071,523 sure from the material before a substantial con yersion and hardening of the resol has occurred. dry powdery mixture, forcing the mixture uni formly and rapidly under high pressure through 2. A process for preparing» a consolidated com a restricted ori?ce while subjecting it to an ele pression mixture which is capable of press mouldlng into shapes and hardening, and is of vated temperature for uniformly liquefying the uniform quality and comprises an arti?cial resin in resol form homogeneously mixed with and im pregnating a porous solid ?lling material, which comprises bringing together ?nely powdered pre condensed resin in resol form with ?nely pow tiered-porous ?lling material in the absence of resin solvent and. thereby forming an intimate resin in the presence of the ?lling material so that the lique?ed resin under said pressure per meates and impregnates the pores of the ?ller, and rapidly cooling and effecting the escape of the mixture from the pressure and temperature ex isting at the ori?ce before a substantial conver- 19 sion and hardening of the resol has occurred. ' RICHARD HESSEN.