GB1581396A - Waterproofing plaster materials - Google Patents
Waterproofing plaster materials Download PDFInfo
- Publication number
- GB1581396A GB1581396A GB37259/77A GB3725977A GB1581396A GB 1581396 A GB1581396 A GB 1581396A GB 37259/77 A GB37259/77 A GB 37259/77A GB 3725977 A GB3725977 A GB 3725977A GB 1581396 A GB1581396 A GB 1581396A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polyhydrogenomethylsiloxane
- plaster
- parts
- water
- weight
- 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.)
- Expired
Links
- 239000011505 plaster Substances 0.000 title claims abstract description 31
- 239000000463 material Substances 0.000 title claims abstract description 20
- 238000004078 waterproofing Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 20
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 10
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 32
- 239000012254 powdered material Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 8
- 239000002671 adjuvant Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 235000011132 calcium sulphate Nutrition 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000003054 catalyst Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 239000001175 calcium sulphate Substances 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 229910052602 gypsum Inorganic materials 0.000 claims description 2
- 239000010440 gypsum Substances 0.000 claims description 2
- 230000036571 hydration Effects 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000002562 thickening agent Substances 0.000 claims description 2
- 229910052925 anhydrite Inorganic materials 0.000 abstract description 3
- 239000005871 repellent Substances 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Abstract
Water repellency of plaster structures is obtained by mixing less than 0.5 parts of a liquid polyhydromethylsiloxane consisting of units of formula <IMAGE> itself not sufficiently water-repellent but being converted into a water-repellent material in the course of the process, with 100 parts of plaster powder which comprises CaSO4 semihydrate, anhydrite III and overburnt plaster, mixing water is then added and the structure is coated with this mixture.
Description
(54) WATERPROOFING PLASTER MATERIALS
(71) We, LAMBERT INDUSTRIES, a French body corporate, of 105 Route d'Argenteuil, 95240 Cormeilles-en-parisis, France, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
Plaster is naturally hydrophilic. Liquid water can impregnate material made from plaster and can migrate to the core of the material. It would be very desirable to waterproof such material but hitherto it has only been possible to do this at high cost.
Various products used for waterproofing powders are known. One of them is a polyhydrogenomethylsiloxane having monomeric units of the formula -SiHCH-O-. This product is marketed in France as Dow Corning Fluid 1107 at a cost of about 28,000 French francs per tonne and the directions for its use are to distribute it in a proportion of 0.5 to 1.5 parts by weight of product to 100 parts by weight of powder, by mixing it into the powder to be waterproofed in the presence of a suitable catalyst. Fol!owing these directions for use with plaster powder means relatively high waterproofing costs and renders the plaster powder unfit for the uses for which it is usually intended; mixing the waterproofed plaster powder with water is difficult and the paste which is obtained expands very greatly, thereby deleteriously affecting the strength of the product.
British Patent Specification No. 952,522 describes a plaster bandage in which calcium sulphate hemihydrate is intimately admixed with from 0.1 to about 10% by weight of a hydroxide of an alkali metal or of an oxide or hydroxide of an alkaline earth metal and from 0.1 to about 10% by weight of a finely-divided water-repellent solid which may be a solid organopolysilooxaneor a liquid organopolysiloxane coated on an inert material.
According to the present invention, a composition which is substantially free of water has been formed by mixing powdered calcium sulphate hemihydrate, powdered insoluble anhydrite (obtained by baking plaster at more than 300"C), polyhydrogenomethylsiloxane and, optionally, soluble anhydrite (anhydrite III: obtained by baking plaster at about 200"C), in which the polyhydrogenomethylsiloxane has been added in liquid form, without any solid adjuvants, the amount of the polyhydrogenomethylsiloxane being less than 0.5 parts by weight per 100 parts by weight of the said powdered materials. Such a composition is satisfactorily hydrophobic.
The composition of the invention can be mixed with water to form a plaster material.
Alternatively, a plaster material may be formed directly by mixing powered calcium sulphate hemihydrate, powdered insoluble anhydrite, a polyhydrogenomethylsiloxane and, optionally, soluble anhydrite, the polyhydrogenomethylsiloxane being added in liquid form, without any solid adjuvants, and in an amount which is less than 0.5 parts by weight per 100 parts of the said powdered materials.
It is preferred that from 0.05 to 0.4, e.g. about 0.15 parts, by weight of the polyhydrogenomethylsiloxane should be used per 100 parts by weight of the powdered materials. The anhydrous compositions of the invention are preferably, but not necessarily, formed by mixing the polyhydrogenomethylsiloxane with calcium sulphate hemihydrate and subsequently mixing in insoluble anhydrite and any soluble anhydrite. In any of the embodiments of the invention, it may be appropriate to dilute the polyhydrogenomethylsiloxane in a compatible liquid before mixing.
It is preferred that soluble anhydrite should be present in the compositions and methods of this invention. It has been observed that good preservation of the plaster powder containing the waterproofing agent requires the presence of soluble anhydrite, which is the variety of calcium sulphate obtained by dehydration of gypsum at moderate temperature beyond the hemihydrate and which is converted spontaneously into the hemihydrate on contact with air, by absorption of water vapour contained in air. This is why, if it is desired to ensure the preservation of the waterproofing capacity, it is also necessary to protect the powder containing the waterproofing agent against the action of water vapour in the air.
Plaster materials made in accordance with the invention are especially sultable for use in buildings or other external surfaces. Their strength is not effected in the manner described in relation to the prior art where the proportion of the polyhydrogenomethylsiloxane is too high. Plaster materials can be formed in accordance with the invention without the need for a catalyst, and there is no difficulty in forming the material either by hand or by using known casting machines. The paste which is obtained in the presence of water does not expand to any great extent, and because of the low proportion of polyhydrogenomethylsiloxane, the waterproofing cost is kept relatively low.
It is to be understood that the present invention is not limited to particular forms of plaster powders, but the following Examples illustrates how the invention can be used.
Example
To a plaster powder containing 94.5% of calcium sulphates (comprising calcium sulphate hemihydrate, insoluble anhydrite and about 20% of soluble anhydrite), 5% of impurities, and about 0.5% of delaying products and thickener, 1.5 kg of waterproofing polymer per tonne of plaster powder was mixed in. A paste was obtained from the powder mixture by mixing in water mechanically in a casting machine. After 7 days of hydration, drying and moulding, prisms (4 x 4 x 16 cm) gave the following results:
Bending strength 56 bars
Compressive strength 212 bars
BRINELL hardness 335 bars
Dynamic modules of elasticity 91,900 bars
Weight per unit volume 1,260 kg per m3
Water absorption
(24 hrs total immersion) 1.75 %
WHAT WE CLAIM IS:
1.A composition which is substantially free of water and which has been formed by mixing powdered calcium sulphate hemihydrate, powdered insoluble anhydrite, a polyhydrogenomethylsiloxane and, optionally, soluble anhydrite, in which the polyhydrogenomethylsiloxane has been added in liquid form, without any solid adjuvants, and in which the amount of the polyhydrogenomethylsiloxane is less than 0.5 parts by weight per
100 parts by weight of the said powdered materials.
2. A composition according to claim 1 which comprises soluble anhydrite.
3. A composition according to claim 1 or claim 2 which comprises 0.05 to 0.4 parts by weight of the polyhydrogenomethylsiloxane per 100 parts by weight of the said powdered materials.
4. A composition according to any preceding claim which has been formed by mixing the polyhydrogenomethylsiloxane with the calcium sulphate hemihydrate and subsequently mixing in the soluble anhydrite and any soluble anhydrite.
5. A composition according to claim 1 substantially as herein described with reference to the Example.
6. A method for forming a plaster material which comprises adding water to a composition according to any preceding claim
7. A method for forming a plaster material which comprises mixing water, powdered calcium sulphate hemihydrate, powdered insoluble anhydrite, a polyhydrogenomethylsiloxane and, optionally, soluble anhydrite, in which the polyhydrogenomethylsiloxane is added in liquid form, without any solid adjuvants, and in which the amount of the polyhydrogenomethylsiloxane is less than 0.5 parts by weight per 100 parts by weight of the said powdered materials.
8. A method according to claim 7 in which soluble anhydrite is used.
9. A method according to claim 7 or claim 8 in which the amount of the polyhydrogenomethylsiloxane is from 0.05 to 0.4 parts by weight per 100 parts by weight of the said powdered materials.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
- **WARNING** start of CLMS field may overlap end of DESC **.containing the waterproofing agent requires the presence of soluble anhydrite, which is the variety of calcium sulphate obtained by dehydration of gypsum at moderate temperature beyond the hemihydrate and which is converted spontaneously into the hemihydrate on contact with air, by absorption of water vapour contained in air. This is why, if it is desired to ensure the preservation of the waterproofing capacity, it is also necessary to protect the powder containing the waterproofing agent against the action of water vapour in the air.Plaster materials made in accordance with the invention are especially sultable for use in buildings or other external surfaces. Their strength is not effected in the manner described in relation to the prior art where the proportion of the polyhydrogenomethylsiloxane is too high. Plaster materials can be formed in accordance with the invention without the need for a catalyst, and there is no difficulty in forming the material either by hand or by using known casting machines. The paste which is obtained in the presence of water does not expand to any great extent, and because of the low proportion of polyhydrogenomethylsiloxane, the waterproofing cost is kept relatively low.It is to be understood that the present invention is not limited to particular forms of plaster powders, but the following Examples illustrates how the invention can be used.Example To a plaster powder containing 94.5% of calcium sulphates (comprising calcium sulphate hemihydrate, insoluble anhydrite and about 20% of soluble anhydrite), 5% of impurities, and about 0.5% of delaying products and thickener, 1.5 kg of waterproofing polymer per tonne of plaster powder was mixed in. A paste was obtained from the powder mixture by mixing in water mechanically in a casting machine. After 7 days of hydration, drying and moulding, prisms (4 x 4 x 16 cm) gave the following results: Bending strength 56 bars Compressive strength 212 bars BRINELL hardness 335 bars Dynamic modules of elasticity 91,900 bars Weight per unit volume 1,260 kg per m3 Water absorption (24 hrs total immersion) 1.75 % WHAT WE CLAIM IS: 1.A composition which is substantially free of water and which has been formed by mixing powdered calcium sulphate hemihydrate, powdered insoluble anhydrite, a polyhydrogenomethylsiloxane and, optionally, soluble anhydrite, in which the polyhydrogenomethylsiloxane has been added in liquid form, without any solid adjuvants, and in which the amount of the polyhydrogenomethylsiloxane is less than 0.5 parts by weight per100 parts by weight of the said powdered materials.
- 2. A composition according to claim 1 which comprises soluble anhydrite.
- 3. A composition according to claim 1 or claim 2 which comprises 0.05 to 0.4 parts by weight of the polyhydrogenomethylsiloxane per 100 parts by weight of the said powdered materials.
- 4. A composition according to any preceding claim which has been formed by mixing the polyhydrogenomethylsiloxane with the calcium sulphate hemihydrate and subsequently mixing in the soluble anhydrite and any soluble anhydrite.
- 5. A composition according to claim 1 substantially as herein described with reference to the Example.
- 6. A method for forming a plaster material which comprises adding water to a composition according to any preceding claim
- 7. A method for forming a plaster material which comprises mixing water, powdered calcium sulphate hemihydrate, powdered insoluble anhydrite, a polyhydrogenomethylsiloxane and, optionally, soluble anhydrite, in which the polyhydrogenomethylsiloxane is added in liquid form, without any solid adjuvants, and in which the amount of the polyhydrogenomethylsiloxane is less than 0.5 parts by weight per 100 parts by weight of the said powdered materials.
- 8. A method according to claim 7 in which soluble anhydrite is used.
- 9. A method according to claim 7 or claim 8 in which the amount of the polyhydrogenomethylsiloxane is from 0.05 to 0.4 parts by weight per 100 parts by weight of the said powdered materials.
- 10. A plaster material when formed by a method according to any of claims 6 to 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7626882A FR2363532A1 (en) | 1976-09-07 | 1976-09-07 | PROCESS FOR HYDROFUGATION OF PLASTER ARTICLES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1581396A true GB1581396A (en) | 1980-12-10 |
Family
ID=9177437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37259/77A Expired GB1581396A (en) | 1976-09-07 | 1977-09-07 | Waterproofing plaster materials |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS5363431A (en) |
| AR (1) | AR217445A1 (en) |
| AU (1) | AU512195B2 (en) |
| BE (1) | BE858468A (en) |
| BR (1) | BR7705937A (en) |
| CH (1) | CH624651A5 (en) |
| DE (1) | DE2740049A1 (en) |
| EG (1) | EG12807A (en) |
| FR (1) | FR2363532A1 (en) |
| GB (1) | GB1581396A (en) |
| GR (1) | GR63625B (en) |
| IL (1) | IL52829A (en) |
| IT (1) | IT1085699B (en) |
| PT (1) | PT66896B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1120384A1 (en) | 2000-01-27 | 2001-08-01 | Wacker Polymer Systems GmbH & Co. KG | Water repellant agent for hydrophobing building materials with gypsum binder |
| US8070895B2 (en) | 2007-02-12 | 2011-12-06 | United States Gypsum Company | Water resistant cementitious article and method for preparing same |
| US8329308B2 (en) | 2009-03-31 | 2012-12-11 | United States Gypsum Company | Cementitious article and method for preparing the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5654263A (en) * | 1979-10-02 | 1981-05-14 | Kurashiki Boseki Kk | Waterrresistant gypsum formed body |
| DE3429311C1 (en) | 1984-08-09 | 1985-12-05 | Bayer Ag, 5090 Leverkusen | Process for the production of water-repellent porous molded body from plaster |
| DE3704439A1 (en) * | 1987-02-12 | 1988-08-25 | Wacker Chemie Gmbh | METHOD FOR PRODUCING WATER-REPELLENT OBJECTS FROM PLASTER AND HYDROPHOBIC AGENTS CONTAINING PLASTER POWDER |
-
1976
- 1976-09-07 FR FR7626882A patent/FR2363532A1/en active Granted
-
1977
- 1977-08-05 IT IT26555/77A patent/IT1085699B/en active
- 1977-08-05 PT PT66896A patent/PT66896B/en unknown
- 1977-08-26 IL IL52829A patent/IL52829A/en unknown
- 1977-09-05 GR GR54300A patent/GR63625B/en unknown
- 1977-09-05 EG EG513/77A patent/EG12807A/en active
- 1977-09-06 AU AU28592/77A patent/AU512195B2/en not_active Expired
- 1977-09-06 AR AR269110A patent/AR217445A1/en active
- 1977-09-06 CH CH1088377A patent/CH624651A5/en not_active IP Right Cessation
- 1977-09-06 DE DE19772740049 patent/DE2740049A1/en not_active Withdrawn
- 1977-09-07 JP JP10687177A patent/JPS5363431A/en active Pending
- 1977-09-07 BE BE180721A patent/BE858468A/en unknown
- 1977-09-07 GB GB37259/77A patent/GB1581396A/en not_active Expired
- 1977-09-08 BR BR7705937A patent/BR7705937A/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1120384A1 (en) | 2000-01-27 | 2001-08-01 | Wacker Polymer Systems GmbH & Co. KG | Water repellant agent for hydrophobing building materials with gypsum binder |
| US6547874B2 (en) | 2000-01-27 | 2003-04-15 | Wacker Polymer Systems Gmbh & Co. Kg | Hydrophobicizing agents for hydrophobicizing gypsum-plaster-bound construction materials |
| US8070895B2 (en) | 2007-02-12 | 2011-12-06 | United States Gypsum Company | Water resistant cementitious article and method for preparing same |
| US8568544B2 (en) | 2007-02-12 | 2013-10-29 | United States Gypsum Company | Water resistant cementitious article and method for preparing same |
| US8329308B2 (en) | 2009-03-31 | 2012-12-11 | United States Gypsum Company | Cementitious article and method for preparing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| PT66896A (en) | 1977-09-01 |
| AR217445A1 (en) | 1980-03-31 |
| IT1085699B (en) | 1985-05-28 |
| BR7705937A (en) | 1978-07-18 |
| EG12807A (en) | 1979-12-31 |
| BE858468A (en) | 1978-03-07 |
| GR63625B (en) | 1979-11-27 |
| PT66896B (en) | 1979-01-26 |
| IL52829A (en) | 1981-11-30 |
| CH624651A5 (en) | 1981-08-14 |
| IL52829A0 (en) | 1977-10-31 |
| AU2859277A (en) | 1979-05-03 |
| FR2363532B1 (en) | 1982-08-27 |
| JPS5363431A (en) | 1978-06-06 |
| DE2740049A1 (en) | 1978-03-09 |
| FR2363532A1 (en) | 1978-03-31 |
| AU512195B2 (en) | 1980-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |