GB2068403A - Pre-mix for forming a self- hardening composition - Google Patents
Pre-mix for forming a self- hardening composition Download PDFInfo
- Publication number
- GB2068403A GB2068403A GB8003827A GB8003827A GB2068403A GB 2068403 A GB2068403 A GB 2068403A GB 8003827 A GB8003827 A GB 8003827A GB 8003827 A GB8003827 A GB 8003827A GB 2068403 A GB2068403 A GB 2068403A
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- GB
- United Kingdom
- Prior art keywords
- composition
- mix
- sodium silicate
- self
- weight
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Classifications
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- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J1/00—Adhesives based on inorganic constituents
- C09J1/02—Adhesives based on inorganic constituents containing water-soluble alkali silicates
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A self-hardening composition may be made by mixing an alkaline earth metal halide, preferably calcium or magnesium chloride or mixture thereof, calcium metasilicate, sodium fluorosilicate, an aluminum silicate clay such as kaolin, sodium silicate and water. A pre-mix for use in the formation of such a composition can be made up by omitting the sodium silicate and water or by incorporating dry sodium silicate with the other ingredients. The self-hardening composition formed in accordance with the invention may be used as a bonding composition which will provide insulation against temperature extremes whilst retaining bond strength and avoiding the emission of toxic fumes when subjected to extreme heat or fires. Composite materials may be made up by mixing expanded aggregate materials and/or reinforcing fibers with such self-hardening compositions. These composite materials may be employed in the production of laminates by adhering layers thereof to facing sheets or may be employed as such in the formation of insulating structures by pressing or extruding such composite materials to produce a desired shape.
Description
SPECIFICATION
Pre-mix for forming a self-hardening composition, self-hardening composition and composite comprising the same, laminate and insulating structure made from the composite and ingredient for use in any of the aforesaid
This invention relates to a pre-mix composition which, upon admixture with sodium silicate and water, can produce a self-hardening composition having a number of advantageous features.
Many adhesives and bonding compounds in present use are derived from petro-chemical or organic sources. These materials can emit toxic products or ignite in a fire, often resulting in ignition or degradation of particles bonded therewith to form further toxic products, exposure to which can be fatal in confined spaces.
Other bonding compounds adapted for compositions which will withstand extreme temperatures are kiln dried, fired or otherwise subjected to external heating to achieve satisfactory bonding, e.g., fired bricks, tiles, etc.
Utilising the present invention, a composition for insulating materials may be made by cold mixing various components to make a bonding compound that can be intermixed with particulate fillers such as expanded perlite, fiber glass, mineral fibers or wools or diatomite to form a paste. The paste can be molded, pressed or otherwise formed into structured products using conventional machines. The bonded products formed therefrom insulate against extremes of temperature but lose no bond strength and emit no toxic fumes when subjected to extreme heat or fires.
Subject to the disclaimer contained hereinafter before the claims, according to the present invention there is provided a pre-mix for the formation of a self-hardening composition by the addition to said pre-mix of sodium silicate and water comprising an alkaline earth metal halide, calcium metasilicate, sodium fluorosilicate and an aluminum silicate clay (e.g. kaolin). Another pre-mix of the invention may comprise, in addition to previously-mentioned ingredients, dry sodium silicate.
The invention further provides a self-hardening composition comprising an alkaline earth metal halide, calcium metasilicate, sodium fluorosilicate, sodium silicate, an aluminum silicate clay and water.
The alkaline earth metal halide is preferably a chloride (see later).
In a preferred compositional aspect, this invention provides a self-hardening composition consisting of 35% by weight of an alkaline earth metal chloride, 0.51.5% by weight of calcium metasilicate, 0,5-1.5% by weight of sodium fluorosilicate, 3040% by weight of sodium silicate, 0.020.04% by weight of an aluminum silicate clay, and water.
A further aspect of this invention is a self-hardening composite material comprising 1035% by weight the ingredients of the foregoing self-hardening composition, admixed with an expanded aggregate material and/or reinforcing fibers.
The present invention is ideally suited to the fire proofing of building or other structures either by providing an integral part of such structures or by providing an insulating coating.
The expression "alkaline earth metal chloride" is used herein and means MgCI2 or CaCI2 or a mixture thereof, preferably a 1:1 mixture thereof represented by the formula CaCl2. MgCI2.
Calcium metasilicate is represented by the formula CaSiO3, whether in the cr-(pseudowollastonite) or P-(wollastonite) form.
Sodium fluorosilicate, silicofluoride or hexafluorosiiicate is represented by the formula Na2SiF6.
The term "aluminum silicate clay" as used herein includes non-expanding clays, of which kaolinite, halloysite, illite and attapulgite are exemplary. However, kaolin is preferred.
"Sodium silicate" as used in the specification and claims is generally represented by the formula
Na2SiO3 and is also known as water glass (a concentrated solution) or sodium metasilicate. Sodium silicate includes products expressed as having various ratios of Na2O: SiO2. Typically, in the practice of this invention, sodium silicate is used in the form of a solution in which the SiO2 : Na2O molar ratio is 1.65:3.9. A preferred sodium silicate has a specific gravity of 1.387 at 499.3 per litre. Solutions of sodium silicate used in the practice of this invention usually contain about 3040% of solids, i.e., solutions of above about 340 Barm6 will be used.Most preferably, the bonding compositions of this invention will contain 3539% by weight of sodium silicates. Therefore, sodium silicate solutions above about 390 Baumé are usually used.
The self-hardening compositions of this invention may be made by combining the solid ingredients, for example, with paddles or mechanicaily opposed rotating arms. To this pre-mix can be added sodium silicate solution or dry sodium silicate (to produce another type of pre-mix). Mixing is continued until the product has an acceptable viscosity, preferably of the order of 26 centipoise at 68.40F. If the bonding composition is being used without fillers, the material is fabricated into the desired shape and permitted to set under ambient conditions. The time required for setting is dependent upon ambient temperature and open time required. Rule of thumb is 30 minutes at 6O0F ambient at which point the product has the following characteristics: Conductivity is subject to fillers used and end product needs.As a rough guide 25 mm at 18 Ib/ft3 will come out at 0.04-0.06 W/m deg. C. (or better). Low temperatures ranges down to minus 1000C. (or better) dependent upon known prior specifics.
The bonded product has a hard rigid set and face. Natural colour is pearl white. Crushing strength ... (without any additions apart from perlite and bonding compound) ... 40 kg/in2.
At the end of 1/3 hours curing is complete, as indicated by surface hardness.
Because the compositions of the invention are self-hardening, it will be understood that the ingredients are mixed just prior to use. If desired, the solid ingredients can be premixed and shipped dry.
At the point of use, the solid ingredients can then be combined with sodium silicate solution.
It will be appreciated that the use of the self-hardening compositions of the invention per se in forming insulating structures or laminated materials (including facing sheets) is envisaged. However, socalled "composite" materials are highly preferred for such uses. Accordingly, in preferred embodiments, 10-35% by weight of the present bonding (self-hardening) composition is extended with an expanded aggregate material and/or reinforcing fiber material to provide fire-retardant light-weight air-curable composites.
"Expanded aggregate material" as used herein includes, but is not limited to, cellular perlite, vermiculite, cellular glass, expanded slag, cellular diatomite and cellular pumice. However, the foregoing are preferred, most preferably expanded or cellular perlite and cellular diatomite.
The expanded aggregate material used in the practice of this invention usually has a particle size of from 150 microns to 4750 microns depending upon the specifications of structured end product
requirement However, material mesh of 2400 < 750 microns is generally preferred. The density of the expanded aggregate materials can be from 221 11 2 Ib/ft3 (40-180 kg/m3), although aggregates having densities of 5r112 Ib/ft3 (90-1 80 kg/m3) are preferred. Preferred sieve size of expanded perlite particles is 3000-6000 microns, with particle size (expanded) running from 3 mm to 7 mm.
"Reinforcing fibers" include, but are not limited to, organic fibers and fiber glass. Fiber glass is preferred owing to resistance to combustion. Organic fibers include natural fibers such as cellulose and wood fibers and synthetic fibers, e.g., from E to 1 2 inches in length.
In the practice of the invention, the filler being bonded may be mixed with the cold self-hardening bonding composition to form a paste which may be shaped by extrusion or pressing at 7-40 psi or higher pressures to the required shape, and predetermined product strength required.
Structured end products with densities of 10 to 39 Ib/ft3 may be obtained in this fashion.
Addition of inorganic viscosity increasing agents, e.g., Sodium Silicate in solution at S : G 1.387-4.864 pounds per U.S. gallon to the basic bonding compound up to a level of up to 10% by weight will extend curing time. The curing time can be decreased by the addition of up to 8% by weight of inorganic filler, e.g., Kaolin, Diatomaceous Earth, Fine Mica, Vermiculite, Talc etc. to the selfhardening composition of composites made therefrom.
The process of mixing of the basic self-hardening bonding compound and curing the products through stacking and shipping of structured end products is therefore carried out without application of external heat for drying or curing.
It will be understood that the composite materials containing the self-hardening composition of this invention can, while the composites are in the form of a paste of the required density, be formed, pressed or molded under varying pressures between sheets to form double or single faced laminates.
Either facing sheet of the thus-formed laminate is of metal, cardboard, plastic, fiber glass, paper or any other material which will adhere to the composite material, which will dry and cure at ambient temperature. Preferred laminates are those wherein the filler is fiberglass and the facing sheet is metal or fiber glass.
With respect to the self-hardening composition of this invention, the most preferred embodiment is that wherein the alkaline earth metal chloride is CaCI2 MgCI2, the aluminum silicate clay is kaolin, the amount of sodium silicate is 3539% by weight and the molar ratio Na2O :SiO2 is 1:1.65-3.9.
Of the composites prepared in accordance with the invention, one which is particularly preferred is that wherein the expanded aggregate material is cellular perlite, vermiculite, cellular glass, expanded slag, cellular diatomite or cellular pumice. Another particularly preferred composite contains both one of the foregoing types of aggregate and a reinforcing filler selected from fiber glass or mineral fiber.
Naturally, the present invention embraces methods of making the present pre-mix, composition composite or laminate.
The invention also provides an insulating structure (and a method of making the same) comprising a composite of the invention pressed or extruded to the desired shape.
Further provided by the invention is any ingredient for any of the above-specified uses (i.e. when intended or particularly suitable for such uses, whether associated with instructions or not).
In the following Examples, which are to be construed as merely illustrative and not limiting upon the scope of the invention, the temperatures are set forth uncorrected in degrees Celsius; unless otherwise indicated, all parts and percentages are by weight.
EXAMPLE 1
Preparation of Self-Hardening Composition
The following dry ingredients were mixed together by a rotary mixer:
% by weight
Magnesium Calcium Chloride CaCI2:MgCl2 4
Calcium Metasilicate CaSiO3 2
Sodium Fluorosilicate 1
Kaolin 1/32
To the resulting dry mix was added 93 31/32% by weight of commercial sodium silicate solution (40.5 Barm6, Na2O : SiO2 ratio 1:1.65-3.9). The mixture was stirred to a viscosity of 26 centipoise.
EXAMPLE 2
% by weight
Expanded Perlite Particles 63-90 Bonding Compound of Example 1 10-37
The particles to be bonded were first dry mixed together by mechanically opposed rotating arms and then mixed with the bonding compound in the cold state. The resulting mass was stirred to a paste, which was shaped by application of pressure from 1 5-38 psi into structural products.
EXAMPLE 3
% by weight
Fibers (Organic) 68-84 Diatomite 5-17 Bonding Compound of Example 1 23-35 The composite was mixed as in Example 2 and pressed at 1 7 psi to obtain structural products, which cured at ambient conditions within 1-3 hours to a product having the following characteristics:
Pearl white coloured rigid board with perlite particles shape clearly visible. Capable to be handled and used and when tapped with the finger, gives a resonant solid sound.
EXAMPLE 4
% by weight
Expanded Perlite Particles 25-56 Organic Fibers 32 45 Bonding Compound of Example 1 18-29 A composite material was obtained as in Example 2.
EXAMPLE 5
% by weight
Expanded Perlite Particles 60-85 Fiber Glass 5-12 Bonding Compound of Example 1 10-34
Composite material obtained as in Example 2 had the following characteristics:
A rigid light weight (17-22 Ib/ft3) dry faced core material that had high thermal insulation qualities. Non hygroscopic with free moisture content maximum 0.5%. Appearance pearl white.
Softening point 9000--1 1000C. (1600--20000F.).
Fusion point 12800 13500C. (2300-24500F.).
Products structured from examples 1, 2, 3, 5, 6, 7, were inert. Some unlaminated core material (made from Example 5) in accordance with the present invention in the form of dry panels with a specific density of 27 Ib/ft3 (432 kg/m3) in 1.0 metre lengths as cold mixed formed and cured panels.
These panels were used to form a dry board encasement fire protection cover for a structural steel column and was submitted to a time and temperature test curve of:
British Standard 476: part 8 (1972) in the following categories:
Dry panels encasement at 50 mm (2 inches) thick with no laminates either side
Stability: 120 mins.
Re-load: Satisfied
Fire resistance: 120 mins.
Dry panels encasement at 25 mm (1 inch) thick with no laminates either side
Stability: 60 mins.
Re-load: Satisfied
Fire resistance: 60 mins.
Further tests showed that the foregoing panels were completely incombustible and non-toxic when submitted to furnace temperatures of 20000F. for extended periods and not subject to loss of bond when direct flame in the same temperature range, was applied to any face of the material for extended periods.
The foregoing Examples relate to a rigid dry formed panel, but by the very nature of complete compounds and aggregates, and by the very low psi pressures required to form a desired end product, it is possible to press and mold to any shape that it is capable to be so produced from existing plant and equipment with a modification being made to the feed, and pressure applied in order to retain the known and natural insulation qualities and geodedic strengths that is found in pre-examined perlite particles of all grade sizes.
EXAMPLE 6
Composites containing up to 55% of fiber glass (see Example 4) had better load bearing characteristics and higher shear strength than those of Example 2.
EXAMPLE 7
Composites of the following compositions are prepared as in Example 2:
% by weight
Expanded Perlite Particles: Large Grade 63-74 Kaolin
Glass Fibers: One Inch Long 1-5
Bonding Compound of Example 1 10-28
The products were structured as core materials having a nominal density of 15 to 28 Ib/ft3, and laminated on each face with aluminum foil, air-laid fiber glass sheeting, etc.
The preceding Examples can be repeated with similar success by substituting the generically or specifically described reactants and/or operating conditions of this invention for those used in the preceding Examples.
From the foregoing description, one skilled in the art can easily, without departing from the spirit and scope of the invention, make various changes and modifications of the invention to adapt it to various usages and conditions. It should, however, be understood that no claim is made herein to a chemically setting bonding "compound" obtained as a result of cold mixing magnesium chloride, calcium metasilicate, sodium fluorosilicate, kaolin and sodium silicate in the fluid state (i.e. solution); or to a composition comprising said "compound" and one or more of pre-expanded perlite particles, organic fibers, fiber glass, mineral fibers and diatomaceous earth; or to a product formed by setting such a composition into a desired shape (e.g. insulation products such as panels); or to a method of producing said "compound" or composition by mixing the ingredients together; or to the use of said composition in forming said product; or to a pre-mix comprising magnesium chloride sodium fluorosilicate, calcium metasilicate and kaolin for use in forming said "compound", said pre-mix, "compound", composition and product are all disclosed in the documents filed in pursuance of Patent
Application No. 30830/78 (2026531).
Subject to the foregoing disclaimer, the following are the claims.
Claims (14)
1. A pre-mix for the formation of a self-hardening composition by the addition to said pre-mix of sodium silicate and water comprising an alkaline earth metal halide, calcium metasilicate, sodium fluorosilicate and an aluminum silicate clay (e.g. Kaolin).
2. A pre-mix as claimed in claim 1, wherein the alkaline earth metal halide is magnesium chtoride, calcium chloride or a mixture thereof.
3. A pre-mix as claimed in claim 1 or claim 2 mixed with dry sodium silicate.
4. A self-hardening composition comprising an alkaline earth metal halide, calcium metasilicate, sodium fluorosilicate, sodium silicate, an aluminum silicate clay and water.
5. A composition as claimed in claim 4 containing 35% by weight of the alkaline earth metal halide, 0.5-1.5% by weight of calcium metasilicate, 0.5-1.5% by weight of sodium fluorosilicate, 3040% by weight of sodium silicate, and 0.020.04% by weight of the aluminum silicate clay.
6. A composition as claimed in claim 4 or claim 5, wherein the sodium silicate and at least part of the water is provided in the form of a sodium silicate solution.
7. A composition as claimed in any one of claims 4 to 6, wherein the alkaline earth metal halide is magnesium chloride, calcium chloride or a mixture thereof, preferably CaCI2. MgCI2.
8. A composition as claimed in any one of claims 4 to 7, wherein the aluminum silicate clay is kaolin.
9. A composition as claimed in any one of claims 4 to 8, wherein the amount of sodium silicate is 3539% by weight.
10. A composition as claimed in any one of claims 4 to 9, wherein the sodium silicate has a Na2O:Si02 ratio of 1:1.65-3.9.
11. A self-hardening composite material comprising an expanded aggregate material and/or reinforcing fibers, mixed with from 1035% by weight of the material of the ingredients of a composition as claimed in any one of claims 4 to 10.
12. A laminate comprising a composite material as claimed in claim 11 hardened and firmly adhered to a facing sheet.
13. An insulating structure which has been made by pressing or extruding a composite material as claimed in claim 11 to a desired shape and allowing the composite material to harden.
14. Any one of the ingredients as referred to in the definition of a pre-mix in any one of claims 1 to 3, of a composition in any one of claims 4 to 10 or of a composite material in claim 11 intended for use in the formation of such pre-mix, composition or composite material or for use in the formation of a laminate as claimed in claim 12 or an insulating structure as claimed in claim 13, said ingredient optionally being associated with instructions for such use.
14. Any one of the ingredients as refereed to in the definition of a pre-mix in any one of claims 1 to 3, of a composition in any one of claims 4 to 10 or of a composite material in claim 11 for use in the formation of such pre-mix, composition or composite material or for use in the formation of a laminate as claimed in claim 12 or an insulating structure as claimed in claim 13, said ingredient optionally being associated with instructions for such use.
New claims or amendments to claims filed on 28th April 1981.
Superseded claims 14.
New or amended claims:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8003827A GB2068403B (en) | 1980-02-05 | 1980-02-05 | Pre-mix for forming a self-hardening composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8003827A GB2068403B (en) | 1980-02-05 | 1980-02-05 | Pre-mix for forming a self-hardening composition |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2068403A true GB2068403A (en) | 1981-08-12 |
GB2068403B GB2068403B (en) | 1984-11-14 |
Family
ID=10511132
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8003827A Expired GB2068403B (en) | 1980-02-05 | 1980-02-05 | Pre-mix for forming a self-hardening composition |
Country Status (1)
Country | Link |
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GB (1) | GB2068403B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991003438A1 (en) * | 1989-09-05 | 1991-03-21 | Dennis Jon Hacker | Material and method to manufacture light weight roof tiles |
US10370624B2 (en) | 2015-12-28 | 2019-08-06 | Colgate-Palmolive Company | Dishwashing pastes |
CN115305016A (en) * | 2022-08-17 | 2022-11-08 | 科顺民用建材有限公司 | Bi-component waterproof tile glue composition, bi-component waterproof tile glue, and preparation method and application thereof |
-
1980
- 1980-02-05 GB GB8003827A patent/GB2068403B/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991003438A1 (en) * | 1989-09-05 | 1991-03-21 | Dennis Jon Hacker | Material and method to manufacture light weight roof tiles |
US10370624B2 (en) | 2015-12-28 | 2019-08-06 | Colgate-Palmolive Company | Dishwashing pastes |
US10745652B2 (en) | 2015-12-28 | 2020-08-18 | Colgate-Palmolive Company | Dishwashing pastes |
CN115305016A (en) * | 2022-08-17 | 2022-11-08 | 科顺民用建材有限公司 | Bi-component waterproof tile glue composition, bi-component waterproof tile glue, and preparation method and application thereof |
CN115305016B (en) * | 2022-08-17 | 2023-03-10 | 科顺民用建材有限公司 | Bi-component waterproof tile glue composition, bi-component waterproof tile glue, and preparation method and application thereof |
Also Published As
Publication number | Publication date |
---|---|
GB2068403B (en) | 1984-11-14 |
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---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |