GB2048235A - Improved Joint Cement - Google Patents

Improved Joint Cement Download PDF

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Publication number
GB2048235A
GB2048235A GB8013420A GB8013420A GB2048235A GB 2048235 A GB2048235 A GB 2048235A GB 8013420 A GB8013420 A GB 8013420A GB 8013420 A GB8013420 A GB 8013420A GB 2048235 A GB2048235 A GB 2048235A
Authority
GB
United Kingdom
Prior art keywords
joint
cement
cement according
joint cement
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.)
Withdrawn
Application number
GB8013420A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bpb Industries Ltd
Original Assignee
Bpb Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to GB7914464 priority Critical
Application filed by Bpb Industries Ltd filed Critical Bpb Industries Ltd
Priority to GB8013420A priority patent/GB2048235A/en
Publication of GB2048235A publication Critical patent/GB2048235A/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions 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 calcium sulfate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • C04B2111/00672Pointing or jointing materials

Abstract

A joint cement for filling gaps or joints in building structures comprises by weight from 35 to 95% gypsum plaster haying a particle size less than 150 mu m, from 0 to 64% inert mineral filler having a particle size less than 100 mu m, and from 1 to 10% organic polymeric binder. The preferred plaster is hemihydrate plaster and inert fillers may be calcium carbonate talc or clay. The polymeric binder may be polyvinyl alcohol or starch.

Description

SPECIFICATION Improved Joint Cement The present invention relates to joint cements suitable for filling gaps in the surfaces of building structures, and -more especially for filling the joints between adjacent wall boards in a wall or ceiling structure and providing a smooth finished surface.

Conventional joint compositions are composed of mineral filler, for example ground limestone, and binder, usually an organic polymer, together with additives intended to improve or adjust the working properties of the composition, and are mixed with the quantity of water necessary to achieve the desired working consistency. They may be sold dry or in a ready mixed condition, but in any event, after application, they dry by evaporation of the added water. In a wet or humid environment, the drying time can be excessively long, for example as much as six weeks, and completion of the building concerned will be correspondingly delayed.

It is an object of this invention to provide a joint composition which hardens relatively rapidly anc with less dependence on weather conditions than conventional compositions, but which at least maintains the working and smooth finishing properties of conventional compositions.

In accordance with this invention there is provided a joint cement for mixing with water and comprising by weight from 35 to 95% gypsum plaster having a particle size less than 1 50 Mm, from 0 to 64% inert mineral filler having a particle size of less than 100 Mm, and from 1 to 10% organic polymeric binder.

Additives such as additional filler, setting retarder for the gypsum plaster, colour and defoaming agent can be included.

By reason of the incorporation of such a rapid setting hydraulic material as gypsum plaster, the cement of this invention does not rely on evaporation of water for hardening, and gaps or joints filled with this cement can accordingly be ready for further finishing operations in a predictably short time; regardless of atmospheric conditions. Setting times can be adjusted by the use of conventional setting rate adjusters for the cementitious material concerned. Suitable setting times for these cements may be in the range 30 minutes to 6 hours, depending on the preference of the user. For example, with a cement having a setting time of 2 hours, a joint can be filled, including the application of tape, in 4 hours.

The preferred gypsum plaster for the purposes of this invention are hemihydrate plasters with a particle size below 1 50 ym, produced by standard processes. Such plasters naturally have setting times of the order of a few minutes and must be retarded to give the user of the cement sufficient time for application and smoothing. Conventional retarders, for example citric acid, can be used for this purpose.

Inert fillers in the context of the invention should be chemically inert and selected to provide desirable wetting and working characteristics. Calcium carbonate, for example in the form of ground limestone, is well known as a filler in conventional joint compositions, as also talc. Gypsum plaster itself fulfils a filling function, and the quantity of inert fillers can be reduced accordingly. The preferred particle size range for ground limestone is less than 100 ,um. That for talc is less than 40 ,t4m. A clay such as kaolinite or montmorillonite can be added if desired, preferably from 0 to 2% by weight.

The polymeric binder serves to strengthen the set cement, but also contributes to the working properties of the cement.

The binder should be water soluble or dispersible and the preferred polymer is polyvinyl alcohol.

Starch can also be added and contributes to the working properties of the cement.

Other additions may be included such as a defoamer to avoid the formation of bubbles and colour to give the desired shade to the set cement, for example to match the ivory colour of the facing paper of gypsum board.

Preferred formulations according to the invention may be tabulated as follows: Percentage by Weight . Material Minimum Maximum Hemihydrate plaster 35 95 Ground limestone 0 64 Talc 0 10 Clay 0 2 Polyvinyl alcohol 1 10 Starch 0 5 Defoamer 0 3 Colour O 1 Setting retarder as required The dry cement composition according to this invention, formulated as above, has outstanding storage qualities if kept in a sealed container. For the best shelf life, it should be sealed in a bag of substantially impermeable plastics material, such as polyethylene. It can be readily mixed with the prescribed amount of water immediately before use.

The invention enables joint cements to be prepared which, apart from the advantage of predictable and rapid setting already mentioned, possess the qualities of easy mixing with water to a smooth creamy paste, a good "wet edge", good feathering properties, good adhesion and excellent gap filling properties with minimal shrinkage. The hardened cement layer can be sanded if desired. On account of these outstanding qualities, the cements of this invention are of interest for a variety of purposes, including application by hand tools or machine, but especially were joints are to be filled, more particularly in the surfaces of building structures and in wall board structures as already discussed.

Accordingly, the invention also provides a method of filling gaps or joints in structures which comprises applying to the gap or joint a cement as defined above in admixture with water, smoothing the surface of the cement as may be necessary, and thereafter allowing the cement to set or harden in the gap or joint.

Example The following is an example of the practice of the invention.

A dry cement formulation is made up as follows: Material Weight % Hemihydrate plaster (see below) 43.48 Ground limestone (100% less than 100 ym) 48.30 Talc (99.9% less than 40 ym) 4.83 Bentonite (montmorillonite) 0.97 Polyvinyl alcohol (see below) 1.93 Starch (100% less than 150 m) 0.14 Citric acid 0.06 Defoamer 0.19 Colour 0.10 The hemihydrate plaster had a particle size analysis such that 100% was less than 150 m, 84% less than 75,um and 40% less than 45 ym, and had an unadjusted setting time of 8 minutes. The polyvinyl alcohol had a hydrolysis value of 8789% and a viscosity of 27-33 cp in 4% aqueous solution at 200 C.

The above formulation exhibited excellent storage properties when sealed in polyethylene bags.

For use, 1 00 g of the dry formulation was mixed with 47 g water to a creamy paste. The resulting cement had all the desirable working properties mentioned above and exhibited a setting time of about 2 hours.

Claims (7)

Claims
1. A joint cement for mixing with water and comprising by weight from 35 to 95% gypsum plaster having a particle size less than 150 Mm, from 0 to 64% inert mineral filler having a particle size less than 100 ym, and from 1 to 10% organic polymeric binder.
2. A joint cement according to Claim 1 comprising by weight 3595% hemihydrate plaster, 064% calcium carbonate, 0-10% talc, 1-10% hydrnphilic organic polymeric binder and 0--5% starch.
3. A joint cement according to Claim 2 in which the binder is polyvinyl alcohol.
4. A joint cement according to Claim 2 or 3 additionally containing 0--2% montmorillonite clay.
5. A joint cement according to Claim 2 or 3 additionally containing 0--2% kaolinite clay.
6. A joint cement according to Claim 2 or 3 additionally containing by weight 0--3% defoamer and 0-1% colour together with a setting retarder giving a setting time in the range 30 minutes to 6 hours.
7. A method of filling gaps or joints in structures which comprises applying to the gap or joint a cement according to any preceding claim in admixture with water, and thereafter allowing the cement to set or harden in the gap or joint.
GB8013420A 1979-04-25 1980-04-23 Improved Joint Cement Withdrawn GB2048235A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB7914464 1979-04-25
GB8013420A GB2048235A (en) 1979-04-25 1980-04-23 Improved Joint Cement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8013420A GB2048235A (en) 1979-04-25 1980-04-23 Improved Joint Cement

Publications (1)

Publication Number Publication Date
GB2048235A true GB2048235A (en) 1980-12-10

Family

ID=26271327

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8013420A Withdrawn GB2048235A (en) 1979-04-25 1980-04-23 Improved Joint Cement

Country Status (1)

Country Link
GB (1) GB2048235A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227876A1 (en) * 1985-11-29 1987-07-08 Rigips GmbH Adjacent building structures and composition for filling the joint between two adjacent elements of the structures
WO1989010906A1 (en) * 1988-05-04 1989-11-16 Ole Jensen Plaster, a method of preparing said plaster and a device for the application thereof
US5366550A (en) * 1993-04-02 1994-11-22 Tec Incorporated Latex modified cement-based thin set adhesive
WO1996029293A1 (en) * 1995-03-20 1996-09-26 United States Gypsum Company Machinable plaster
WO1999054265A1 (en) * 1998-04-20 1999-10-28 Bpb Plc Gypsum plaster
FR2833982A1 (en) 2001-12-21 2003-06-27 Placoplatre Sa Plasterboard is surfaced with lining paper that is printed on one face with ink containing binder and particulate solid material and opacifying pigment
US6743830B2 (en) 2001-03-07 2004-06-01 Innovative Construction And Building Materials Construction board materials with engineered microstructures
US6841232B2 (en) 2002-11-12 2005-01-11 Innovative Construction And Building Materials Reinforced wallboard
US6902797B2 (en) 2002-11-12 2005-06-07 Innovative Construction And Building Materials Gypsum-based composite materials reinforced by cellulose ethers
US7105587B2 (en) 2001-03-07 2006-09-12 Innovative Construction And Building Materials Method and composition for polymer-reinforced composite cementitious construction material
US7332537B2 (en) * 1996-09-04 2008-02-19 Z Corporation Three dimensional printing material system and method
US7795349B2 (en) 1999-11-05 2010-09-14 Z Corporation Material systems and methods of three-dimensional printing
US7905951B2 (en) 2006-12-08 2011-03-15 Z Corporation Three dimensional printing material system and method using peroxide cure
US7968626B2 (en) 2007-02-22 2011-06-28 Z Corporation Three dimensional printing material system and method using plasticizer-assisted sintering
US8167999B2 (en) 2007-01-10 2012-05-01 3D Systems, Inc. Three-dimensional printing material system with improved color, article performance, and ease of use
US8529691B2 (en) 2011-05-09 2013-09-10 Yoshino Gypsum Co., Ltd. Joint filler composition
WO2015197984A1 (en) 2014-06-26 2015-12-30 Saint-Gobain Placo Composition for joints
EP3370962A4 (en) * 2015-11-04 2019-06-12 Imerys Filtration Minerals Inc Compositions and methods for additive manufacturing

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0227876A1 (en) * 1985-11-29 1987-07-08 Rigips GmbH Adjacent building structures and composition for filling the joint between two adjacent elements of the structures
WO1989010906A1 (en) * 1988-05-04 1989-11-16 Ole Jensen Plaster, a method of preparing said plaster and a device for the application thereof
US5366550A (en) * 1993-04-02 1994-11-22 Tec Incorporated Latex modified cement-based thin set adhesive
WO1996029293A1 (en) * 1995-03-20 1996-09-26 United States Gypsum Company Machinable plaster
US7332537B2 (en) * 1996-09-04 2008-02-19 Z Corporation Three dimensional printing material system and method
WO1999054265A1 (en) * 1998-04-20 1999-10-28 Bpb Plc Gypsum plaster
US7795349B2 (en) 1999-11-05 2010-09-14 Z Corporation Material systems and methods of three-dimensional printing
US6743830B2 (en) 2001-03-07 2004-06-01 Innovative Construction And Building Materials Construction board materials with engineered microstructures
US7105587B2 (en) 2001-03-07 2006-09-12 Innovative Construction And Building Materials Method and composition for polymer-reinforced composite cementitious construction material
WO2003054320A1 (en) 2001-12-21 2003-07-03 Placoplatre Plasterboard
US7591113B2 (en) 2001-12-21 2009-09-22 Placoplatre Plasterboard
FR2833982A1 (en) 2001-12-21 2003-06-27 Placoplatre Sa Plasterboard is surfaced with lining paper that is printed on one face with ink containing binder and particulate solid material and opacifying pigment
US6902797B2 (en) 2002-11-12 2005-06-07 Innovative Construction And Building Materials Gypsum-based composite materials reinforced by cellulose ethers
US6841232B2 (en) 2002-11-12 2005-01-11 Innovative Construction And Building Materials Reinforced wallboard
US7905951B2 (en) 2006-12-08 2011-03-15 Z Corporation Three dimensional printing material system and method using peroxide cure
US8157908B2 (en) 2006-12-08 2012-04-17 3D Systems, Inc. Three dimensional printing material system and method using peroxide cure
US8167999B2 (en) 2007-01-10 2012-05-01 3D Systems, Inc. Three-dimensional printing material system with improved color, article performance, and ease of use
US7968626B2 (en) 2007-02-22 2011-06-28 Z Corporation Three dimensional printing material system and method using plasticizer-assisted sintering
US8506862B2 (en) 2007-02-22 2013-08-13 3D Systems, Inc. Three dimensional printing material system and method using plasticizer-assisted sintering
US8529691B2 (en) 2011-05-09 2013-09-10 Yoshino Gypsum Co., Ltd. Joint filler composition
WO2015197984A1 (en) 2014-06-26 2015-12-30 Saint-Gobain Placo Composition for joints
EP3370962A4 (en) * 2015-11-04 2019-06-12 Imerys Filtration Minerals Inc Compositions and methods for additive manufacturing

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