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Патент USA US2071523

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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.
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