COMPOSITION DURCISSABLE, MATERIAU DUR, ET ARTICLE COMPOSITE QUI RENFERME LEDIT MATERIAU

HARDSETTING COMPOSITION, HARD MATERIAL AND COMPOSITE ARTICLE USING THE SAID MATERIAL

Abrégé anglais

ABSTRACT OF THE DISCLOSURE
Hardsetting composition, of the type
including a hydraulic binder containing silicate and
calcium aluminate, a filler material and water.
The filler material contains cellulose
powder and the said hardsetting composition further
comprises a latex, lime, and calcium chloride (Cl2Ca).
The invention finds a particular
application in the production of insulating panels.

Revendications

The embodiments of the invention in which an exclusive
property or privilege is claimed are defined as follows:
1. A hardsetting composition of the type comprising
a hydraulic binder in the divided state and containing silicate
and calcium aluminate, such as white cement, a filler material
and water, wherein the said filler material contains
cellulose powder and wherein the said hardsetting composition
further comprises a latex, lime, and calcium chloride
(Cl2Ca).
2. The composition of claim 1, wherein the filler
material further contains silica in fine powder form, the
mean diameter of the particles being preferably at the most
equal to 50 µm, with preferably, a weight content varying
between 30% and 200% of the weight of the cellulose powder.
3. The composition of claim 1, wherein the mean
diameter of the particles of cellulose powder is at the
most equal to 250 µm.
4. The composition of claim 1, wherein the latex is
of the acrylic type or of the natural or synthetic rubber
type.
5. The composition of claim 1, wherein the latex contents
by weight of dry extract may vary between 10% and 50% of
the weight of cellulose powder in the dry state.
6. The composition of claim 1, wherein the cellulose
powder contents by weight may vary between 5% and 150% of
the complex lime + hydraulic binder.
7. The composition of claim 1, wherein the filler
material further contains talc with, preferably, a weight
content varying between 10% and 250% of the weight of the
cellulose powder.
8. The hard material obtained from the hardsetting
composition of claim 1.
9. The solid composite article comprising a support
made of expanded plastic, coated over at least one face,

with the hard material obtained from the composition of
claim 1.
10. Application of the article of claim 9 to the
production of insulating panels.

Description

1142185
.
The present invention relates to a hard-
settinS composition containing cement such as white
cement, Portland cement, slag cement or special cementO
The invention relates more particularly
to a hardsetting composition of the type comprising
a hydraulic binder containing silicate and calcium
aluminate, water and a filler material.
The invention further relates to the
hard substance obtained from the said hardsetting
composition, as well as to a solid composite article
obtained by depositing a layer of the said material
on a support.
Mortars are known which are made with
lime, with sand, and a cement o~ the type containing
silicates and càlcium aluminates.
Said mortars, once set, ~ive a material
which has a tendency to crack with time, so that the
material disi~te~ratas rapidly due to the freezing up
of any water penetrating the empty spaces thus created.
In addition, said known mortars adhere hadly to supports
such as wood, metal or plastic materials. And further-
more, the said materials are not suitable for fine works.
It is precisely the object of the invention
to remedy these disadvantages and to propose a hard-
setting composition which is easy to use, which has no
tendency to crack, and is hard and resistant enough to
adhere to any type of support.
This object is reached, according to the
in~ention, due to the fact that the filler material
contains cellulose powder, and that the hardsetting
material urther contains lime, calcium chloride
~C12Ca) and a latex.
The lime contains quicklime (CaO) and/or
slacked lime (calcium hydroxide Ca~OH)2).
~y cellulose powder is meant a substance
:

1142~85
containing more than 50% and preferably more than
65~/o of pure cellulose; this is quite a di-fferent
product from ordinary wood chips or flour which contains
no more than 35/0 cellulose.
S Contrary to ordinary wood flour, said
cellulose powder mixes very closely with all the other
constituents of the composition according to the
invention to give a fine and unctuous paste.
Due to the said cellulose powder, the
material dries right through and more homogeneously,
so that the cracks obtained with the known compositions
are avoidedO Moreover the latex constitutes a water-
proof barrier preventing humidity to set into the
material, once this is hard.
Ordinarily, the cellulose powder does not
present a good affinity for its mixing with the latex.
The calcium chloride (C12Ca) improvesthe affinity of
the cellulose powder to the latex.
Advantageously, the filler material
further contains silica in fine powder form, the diamet~
er of the particles being at the most equal to 50 ,um
with preferably, a content by weight varying between 30
and 200% of the weight of cellulose powder; due to the
presence of silica, the material obtained is hard
and fire-resistant despite the presence of the
cellulose powder.
Advantageously, the msan diameter of the
cellulose powder particles is at the most equal to
250 ,um. This fineness of the cellulose particles makes
3 it possible to obtain a greater molding fineness of the
composition.
Advantageously, the latex is of the
acrylic type or of the synthetic or natural rubber type.
Advantageously, the latex content by weight
of dry extract is between 10 and 50% of the weight

ll~Zl~S
of cellulose powder in the dry stateO
Thus, owin~ to the latex, the material
obtained is less brittle whilst retaining its
hardness, and it is made non porous, so as to be
completely waterproof, this allowing the material
to be used for making-up roofs, ship hulls and other
items needing to be, right through their mass,
resistant to water or to any other liquids.
Advantageously, the cellulose powder
content by weight can vary between 5 and 150% of the
weight of the complex, lime ~ cement.
Advantageously, the filler material also
contains talc, with preferably, a content by weight
varying between 10 and 250% of the weight of cellulose
powder.
The invention also relates to a composite
object comprising a support in expanded plastic such
as polystyrene or expanded polyurethane, coated with
at least one layer of hard material such as defined
hereinabove.
The cellulose powder helps the said
material to adhere to the expanded plastic constituting
the support.
Due to the presence of silica in fine
powder form and in adequate quantity, and of the talc,
the layer of hard material constitutes a really hard
and non-brittle shell.
As a result, the said composite article
is especially applicable to produce insulating and/or
supporting panels, beams, p~nels molded into various
shapes for the b~ilding industry, public works and works
of art.
The invention will be more readily
understood on reading the following deqcription
of three examples of embodiment.

~14Z1~5
.
The accompanying table gives~ by wei~ht,
the pcrcentages of the different constituen-ts included
in the composition of the hardsetting mixture accord-
ing to three examples of embodiment~ This table also
gives the sources, and where applicable, the
commercial reference of these constituents.
Examples 1, 2 and 3 are suitable for the
production of sound-, heat- and fire-insulating panels,
as will be explained hereafter.
Example 2 gives a lighter material which
can also be used to repair furniture.
Example 3 gives a composition which
is suitable for repairing or building walls, stairs
or floors.
One method for producing insulating
panels consists:
- In mixing the constituents in the
proportions indicated in the table, for Example
1 or 2, in order to obtain a liquid or pa3ty material
which is coated over all the external faces of an
expanded polystyrene panel, then in applying on
the said coating a glas~-fibre cloth; a second
coati~g of another liquid or pasty material, obtained
by mixing up the constituents in the proportions of
Example 3, is then applied over said cloth. The
whole is then left to dry.

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