GB2108977A - Water resistant and thermally insulating silicate articles and compositions and method for the production thereof - Google Patents
Water resistant and thermally insulating silicate articles and compositions and method for the production thereof Download PDFInfo
- Publication number
- GB2108977A GB2108977A GB08219669A GB8219669A GB2108977A GB 2108977 A GB2108977 A GB 2108977A GB 08219669 A GB08219669 A GB 08219669A GB 8219669 A GB8219669 A GB 8219669A GB 2108977 A GB2108977 A GB 2108977A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- composition
- thermally insulating
- waterproof
- production
- 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.)
- Granted
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Building Environments (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Fireproofing Substances (AREA)
Abstract
A water resistant and thermally insulating silicate article is produced using a starting mixture having the oxidic composition: from 62 to 68% SiO2; from 1.5 to 5% Al2O3; from 5 to 10% B2O3; from 0.1 to 0.5% CaO+MgO and from 21 to 26% by weight Na2O, all percentages being expressed on a weight basis, and subjecting the mixture to baking at a temperature of 600 to 700 DEG C. The oxidic composition is suitably provided by a mixture of liquid and solid sodium silicate, borax and perlite.
Description
SPECIFICATION
Water resistant and thermally insulating silicate articles and compositions and method for the production thereof
This invention relates to water resistant and thermally insulating silicate articles and compositions and method for the production thereof.
Bulgarian Authorship Certificate No. 23622 describes porous silicate articles and a method for the production thereof. These articles are formed of a mixture of sodium hydropolysilicate and finely particulate siliceous fillers such as sand chalcedonolite slag, steryl or perlite in a ratio by weight of from 1:1 up to 1:10. To produce the articles, sodium hydropolysilicate is obtained in a preliminary step by heating a mixture of liquid sodium silicate and solid sodium silicate in a weight ratio of from 5:1 up to 1:1 on a water bath and drying the material so obtained at a temperature of 300C to a dry material content of from 45 to 55%. This product is admixed with silicate filler in a weight ratio of from 1:1 up to
1:10, and the mixture is ground in a ball mill to not more than 10% fraction left on a sieve of 900 screen holes/cm2.The material so milled is subjected to granulation after addition of from 7 to 20% by volume water. The granules obtained are placed in metal moulds (usually steel moulds) of different sizes and the granulate is compressed under a pressure of from 0.2 to 0.5 MPa. The moulds are placed in an electric furnace heated to a temperature of 2000C and baked at a temperature of from 550 to 6000C for 2 hours.
Disadvantages of this procedure are that the final product sticks to the metal mould, and indeed the overall procedure for producing the final product is too complicated. A disadvantage of the thermally insulating articles so prepared are their high bulk density and relatively low heat insulating capacity. When no silicate fillers are used with the sodium hydropolysilicate, the articles possess low bulk density (i.e. from 60 to 200 mg/m3) and low thermal conductivity, i.e.
0.05-0.1 W/m. deg., but their water resistance is so poor that they disintegrate when subject to atmospheric moisture.
According to one aspect of this invention, there is provided a composition for use in the production of a waterproof and thermally insulating silicate material having an oxidic composition comprising from 62 to 68% by weight SiO2; from 1.5 to 5% by weight Al2O3; from 5 to 10% by weight B2O from 0.1 to 0.5% by weight in total of CaO and MgO and from 21 to 26% by weight of Na2O.
This composition can be used to produce a water resistant and thermally insulating material, possessing a low bulk density (from 100 to 300 kg/m3) and improved heat insulating capacity (A=0.04--0.01 W/m.deg.) when it has been used to form an article having a compressive strength of from 0.3 to 1 MPa.
According to a second aspect of this invention, there is provided a method for the production of a waterproof and thermally insulating silicate article, which comprises baking a shaped mixture having the oxidic composition of the first aspect of the invention at a temperature of from 600 to 7000 C.
In carrying out the method of the second aspect of this invention, it is preferred to use, as a source of the oxidic composition, a mixture of from 55 to 65% by weight of liquid sodium silicate having a modulus in the range of from 2.5 to 3.2; from 11 to 22% by weight of solid, particulate sodium silicate; from 7.4 to 14% by weight borax and from 6 to 17% by weight perlite. Green perlite as well as the residual fine fraction obtained when swelling perlite can both be used in the composition of this invention.
When producing shaped articles by the method of this invention, using the preferred starting mixture, in a preferred procedure, the liquid sodium silicate may be placed in a vessel provided with a stirrer of variable speed and is heated on a water bath. Milled solid sodium silicate is added thereto. After heating the mixture to a temperature of about 700C, a boiling 30% by weight solution of borax is added while stirring the mixture at high speed. A homogeneous mixture is produced to which the perlite is added.
The mixture is then heated to a temperature of about 950C after which it is poured onto a polyethylene foil and is cooled to ambient temperature. The homogeneous mixture is then placed in a metal mould previously lubricated with superphosphate and preheated and heated therein to a temperature of 600-7000C in a furnace. Owing to the high temperature, the mixture expands and fills up the metal mould. The heating may last for from 1 to 4 hours, depending on the size of the articles being produced. Then, the mould with the shaped article therein is cooled slowly to ambient temperature and the article is removed. The process of baking can also be accomplished in a conveyor type furnace, with the material to be heated being provided as a continuous strip which when the baking is completed is cut to size.
As will be appreciated from the foregoing, the present invention offers the following advantages:
The raw materials are easily available nonmanufactured substances;
the overall procedure for producing the shaped articles is simple;
the thermally insulating material is prepared at a relatively low temperature, but still possesses properties similar to those of foamed glass;
the thermally insulating material is water resistant, fire proof and rot proof and can be employed at temperatures of from -500C to 5500C.
The following Examples illustrate this invention:
Example 1
A mixture was prepared consisting of:
64.4% by weight of a 32% by weight solution
of sodium silicate having a modulus of 2.96
21.4% by weight of solid sodium silicate
7.7% by weight of borax; and
6.5% by weight of swelled perlite (residual fine
fraction).
The mixture obtained was baked at a temperature of 6500C. The article so prepared possessed a bulk density of 200 kg/m3; compressive strength of 0.4 MPa and a coefficient of thermal conductivity A=0.06 W/m.deg.
Example 2
A mixture was prepared consisting of:
64% by weight of a 33% by weight solution of
sodium silicate having a modulus of 2.9 1 19/0 by weight of milled solid sodium silicate
8% by weight of borax
17% by weight of swelled perlite (residual fine
fraction).
The mixture was baked at a temperature of 6500C. The articles produced possessed a bulk density of 300 kg/m3; compressive strength of 1
MPa and a coefficient of thermal conductivity
A=0.08 W/m.deg.
Example 3
A mixture was prepared consisting of:
60% by weight of a 30% by weight solution of
sodium silicate having a modulus of 3
20% by weight of milled solid sodium silicate
14% by weight of borax
6% by weight of swelled perlite (residual fine
fraction)
The mixture was baked at a temperature of 6500C. The articles produced possessed a bulk density of 1 80 kg/m3; compressive strength of 0.5 MPa and a coefficient of thermal conductivity A=0.05 W/m.deg.
Example 4
A mixture was prepared consisting of:
57% by weight of a 30% by weight solution of
sodium silicate
19% by weight of milled solid sodium silicate
7.7% by weight of green perlite (milled)
13.3% by weight of borax
3% by weight of swelled perlite (residual fine
fraction)
The mixture was baked at a temperature of 6800 C. The articles produced possessed a bulk density of 1 50 kg/m3 and a compressive strength of 0.3 MPa. The coefficient of thermal conductivity A=0.06 W/m.deg.
Example 5
A mixture was prepared consisting of:
61.7% by weight of a 35% by weight solution
of sodium silicate having a modulus of 2.8
20.6% by weight of solid sodium silicate
(milled)
7.4% by weight of borax
10.3% by weight of milled green perlite
The mixture was baked at a temperature of 6000C. The articles produced possessed a bulk density of 240 kg/m3, a compressive strength of 0.6 MPa and a coefficient of thermal conductivity
A=0.07 W/m.deg.
The water resistance of the articles prepared by the procedures of the foregoing Examples 1 to 5 was tested by boiling the articles in water having a temperature 100-1 050C for a time of 42 hours. After the completion of the test the test samples possessed the same dimensions as initially. No surface cracks and no volume changes were observed after the test and the hardness of the porous silicate structure was preserved. In contrast, test samples, prepared using the sample composition No. 5 disclosed in
Bulgarian Authorship Certification No. 23622 and tested under the same conditions, underwent disintegration when in boiling water for a period of 10 to 30 min. yielding pieces of gel composition. This is believed to be evidence that during the respective heat treatments, the presence of perlite (both green and baked one) and of borax in the indicated amounts, promote the progress of favourable chemical reactions which take place after the completion of the expansion process and result in the formation of a waterproof, finely porous silicate structure.
Claims (9)
1. A composition for use in the production of a waterproof and thermally insulating silicate
material having an oxidic composition comprising from 62 to 68% by weight SiO2; from 1.5 to 5%
by weight Al2O3; from 5 to 10% by weight B203; from 0.1 to 0.5% by weight in total of CaO and
MgO and from 21 to 26% by weight of Na2O.
2. A composition as claimed in claim 1, wherein the oxidic composition is provided by a
mixture of from 55 to 65% by weight liquid
sodium silicate having a modulus of from 2.5 to
3.5; from 11 to 22% by weight of solid sodium
silicate; from 7.4 to 14% by weight of borax and 6 to 17% by weight of perlite.
3. A composition as claimed in claim 2,
wherein the perlite is green perlite or the residual fine fraction obtained when swelling perlite.
4. A composition for use in the production of a waterproof and thermally insulating material
substantially as described in any one of the
foregoing Examples 1 to 5.
5. A method for the production of a water
proof and thermally insulating silicate article
which comprises baking a shaped mixture having the oxidic composition set out in claim 1 at a
temperature of from 600 to 7000 C.
6. A method as claimed in claim 5, wherein
there is used a composition as set forth in claim 2
which is first heated to a dry matter content of
from 55 to 60% by weight.
7. A method as claimed in claim 5 or 6,
wherein the mixture is baked in a metal mould
which has been preheated and lubricated with
superphosphate.
8. A method for the production of a waterproof and thermally insulating article substantially as described in any one of the foregoing Examples 1 to 5.
9. A waterproof and thermally insulating article which has a bulk density of from 100 to 300 kg/m3, a heat insulating capacity, A of 0.04 to 0.1
W/m.deg. and a compressive strength of from 0.3 to 1 MPa, which article has been produced from a composition as claimed in anyone of claims 1 to 3.
9. A waterproof and thermally insulating composition whenever produced by the process claimed in any one of claims 5 to 8.
Superseded Claims 1-9
New or Amended Claims
1. A composition for use in the production of a waterproof and thermally insulating silicate material having an oxidic composition comprising from 62 to 68% by weight SiO2; from 1.5 to 5% by weight Al2O3; from 5 to 10% by weight B203; from 0.1 to 5% by weight in total of CaO and MgO and from 21 to 26% by weight of No 20, which oxidic composition is provided by a mixture of from 55 to 65% by weight liquid sodium silicate having a modulus of from 2.5 to 3.5; from 11 to 22% by weight of solid sodium silicate; from 7.4 to 14% by weight of borax and 6 to 17% by weight of perlite.
2. A composition as claimed in claim 1, wherein the perlite is green perlite or the residual fine fraction obtained when swelling perlite.
3. A composition for use in the production of a waterproof and thermally insulating material substantially as described in any one of the foregoing Examples 1 to 5.
4. A method for the production of a waterproof and thermally insulating silicate article which comprises baking a shaped mass formed from the composition claimed in any one of claims 1 to 2, at a temperature of from 600 to 700"C.
5. A method as claimed in claim 4, wherein the said composition is first heated to a dry matter content of from 55 to 60% by weight prior to undergoing shaping.
6. A method as claimed in claim 4 or 5, wherein the said composition is baked in a metal mould which has been preheated and lubricated with superphosphate.
7. A method for the production of a waterproof and thermally insulating article substantially as described in any one of the foregoing Examples 1 to 5.
8. A waterproof and thermally insulating article whenever produced by the process claimed in any one of claims 4 to 7.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BG8152808A BG34662A1 (en) | 1981-07-07 | 1981-07-07 | Composition of a water-proof insulating material and method of its manufacture |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2108977A true GB2108977A (en) | 1983-05-25 |
GB2108977B GB2108977B (en) | 1985-04-24 |
Family
ID=3909410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08219669A Expired GB2108977B (en) | 1981-07-07 | 1982-07-07 | Water resistant and thermally insulating silicate articles and compositions and method for the production thereof |
Country Status (5)
Country | Link |
---|---|
BG (1) | BG34662A1 (en) |
DE (1) | DE3217260A1 (en) |
FR (1) | FR2509286B1 (en) |
GB (1) | GB2108977B (en) |
IT (1) | IT1189309B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1002806C2 (en) * | 1996-04-05 | 1997-10-07 | Nicolaas Dirk Brouwer | Fire resistant sheet material. |
DE19712835C3 (en) * | 1997-03-26 | 2002-05-08 | Fraunhofer Ges Forschung | Moldings made of a light material, process for their production and their use |
US6805737B2 (en) | 1997-03-26 | 2004-10-19 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Lightweight substance molded body, method for the production and use thereof |
DE19713156A1 (en) * | 1997-03-27 | 1998-10-01 | Basf Ag | Elongated fire protection material |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2059801A (en) * | 1934-11-24 | 1936-11-03 | Harvey B Lindsay | Insulating structure and method of manufacturing same |
GB500575A (en) * | 1937-08-12 | 1939-02-13 | Ernst Rosenthal | Repairing cement for ceramic objects |
DE1244640B (en) * | 1964-06-03 | 1967-07-13 | Basf Ag | Process for the production of insulating materials with a low specific weight |
DE1671266B1 (en) * | 1967-04-26 | 1971-06-09 | Wasagchemie Ag | Process for the production of glass-like porous moldings |
CA936880A (en) * | 1968-07-12 | 1973-11-13 | C. Yates Paul | Silica bound particulate material |
DE2037937C3 (en) * | 1970-07-30 | 1980-01-03 | Hans Joachim Dr. 6640 Merzig Poegel | Process for the production of lightweight ceramic moldings |
US3743601A (en) * | 1970-11-04 | 1973-07-03 | Fiberglas Canada Ltd | Process for making silicate foams from alkali metal silicates |
US3744984A (en) * | 1971-04-05 | 1973-07-10 | O Sato | Process for the manufacture of foamed porcelain-like shaped articles |
US3741898A (en) * | 1971-07-09 | 1973-06-26 | Southwest Res Inst | Foamed product from sodium silicate and process of manufacture thereof |
HU165195B (en) * | 1972-05-12 | 1974-07-27 | ||
DE2323659C3 (en) * | 1973-05-10 | 1979-08-16 | Kubota Ltd., Osaka (Japan) | Process for the production of sound absorption boards, boards, panels or other shaped bodies |
US4072533A (en) * | 1976-10-14 | 1978-02-07 | Armstrong Cork Company | Lightweight, non-cementitious building material |
US4192664A (en) * | 1976-11-19 | 1980-03-11 | Pittsburgh Corning Corporation | Method of making a cellular body from a high silica borosilicate composition |
CA1104593A (en) * | 1977-03-30 | 1981-07-07 | Edward G. Vogel | Coherent rigid solid material |
DE2817268A1 (en) * | 1978-04-20 | 1979-10-31 | Basf Ag | PROCESS FOR THE PRODUCTION OF FIRE PROTECTION MATERIAL BASED ON ALKALINE SILICATES |
DE2827828A1 (en) * | 1978-06-24 | 1980-01-10 | Basf Ag | AGING-RESISTANT FIRE PROTECTION MATERIAL |
-
1981
- 1981-07-07 BG BG8152808A patent/BG34662A1/en unknown
-
1982
- 1982-05-07 DE DE19823217260 patent/DE3217260A1/en not_active Withdrawn
- 1982-07-07 IT IT48765/82A patent/IT1189309B/en active
- 1982-07-07 GB GB08219669A patent/GB2108977B/en not_active Expired
- 1982-07-07 FR FR828211934A patent/FR2509286B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE3217260A1 (en) | 1983-02-10 |
FR2509286A1 (en) | 1983-01-14 |
IT1189309B (en) | 1988-02-04 |
BG34662A1 (en) | 1983-11-15 |
GB2108977B (en) | 1985-04-24 |
FR2509286B1 (en) | 1990-11-16 |
IT8248765A0 (en) | 1982-07-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |