GB2055857A - Asbestos-free heat-settable sealant material - Google Patents

Asbestos-free heat-settable sealant material Download PDF

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Publication number
GB2055857A
GB2055857A GB8022534A GB8022534A GB2055857A GB 2055857 A GB2055857 A GB 2055857A GB 8022534 A GB8022534 A GB 8022534A GB 8022534 A GB8022534 A GB 8022534A GB 2055857 A GB2055857 A GB 2055857A
Authority
GB
United Kingdom
Prior art keywords
asbestos
sealant material
heat
material according
free heat
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
Application number
GB8022534A
Other versions
GB2055857B (en
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.)
Turner and Newall Ltd
Original Assignee
Turner and Newall 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
Application filed by Turner and Newall Ltd filed Critical Turner and Newall Ltd
Priority to GB8022534A priority Critical patent/GB2055857B/en
Publication of GB2055857A publication Critical patent/GB2055857A/en
Application granted granted Critical
Publication of GB2055857B publication Critical patent/GB2055857B/en
Expired legal-status Critical Current

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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
    • C04B28/34—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 cold phosphate binders
    • C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
    • 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
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/46—Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
    • C04B2111/12—Absence of mineral fibres, e.g. asbestos
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72—Repairing or restoring existing buildings or building materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/08—Repairing the housing or pipe-joints
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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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)
  • Sealing Material Composition (AREA)

Abstract

Asbestos-free heat-settable sealant material suitable for application to pipework for the conveyance of hot gas, comprising a plastic matrix of heat-resistant inorganic particles admixed with an aqueous solution or dispersion of binder substance which is essentially organic, said aqueous solution or dispersion containing a humectant to reduce the rate of water loss from the matrix during storage at ambient temperature and thus to preserve plasticity therein, said plastic matrix enclosing cellulose fibres which act as reinforcement for the matrix during heat-setting of the material. The cellulosic fibres may be in the form of a felt, or they may be used as discrete fibres. The binder may be sodium silicate or aluminium orthophosphate. The humectant may be ethylene glycol. The compositions may be used for the temporary repair and/or patching of pipework containing hot gases, e.g. exhaust systems.

Description

SPECIFICATION Heat-settable sealant material This invention relates to heat-settable sealant material suitable for application to pipework for the conveyance of hot gas. Such pipework may for example form part of the exhaust system of the internal combustion engine of a vehicle.
One known form of heat-settable sealant material suitable for the stated purpose comprises discrete fibres of asbestos admixed with an aqueous solution of an alkali metal silicate (sodium silicate) so as to form a plastic paste with which holes formed by corrosion of the pipework can be stopped up.
Another form comprises a felt of asbestos fibres, the felt being impregnated with an aqueous alkali metal silicate to form a bandage ('silencer repair bandage') which can be wrapped round, and moulded by hand round, the pipework to seal the holes. In either case, it is desirable to include the sealant material a humectant, such as ethylene glycol, propylene glycol, glycerol or like polyhydroxy organic compound, to reduce the rate of water loss during storage of the material at ambient temperature and so keep it plastic. The material sets on heating (as when heated by hot exhaust gases) and forms an effective seal for several months.
The present invention is concerned with the provision of an asbestos-free sealant material, and is in part based on our discovery that fibres of cellulose, even though they are not heat-resistant in the sense that asbestos fibres are, can usefully be employed to reinforce heat-settable sealant material (and so keep it intact) during heat-setting on the substrate which it is to seal.
According to the invention, asbestos-free heat-settable sealant material suitable for appliation to pipework for the conveyance of hot gas comprises a plastic matrix of heat-resistant inorganic particles admixed with an aqueous solution or dispersion of binder substance which is essentially inorganic, said aqueous solution or dispersion containing a humectant to reduce the rate of water loss from the matrix during storage at ambient temperature and thus to preserve plasticity therein, said plastic matrix enclosing cellulose fibres which act as reinforcement for the matrix during heat-setting of the material.
By the term 'binder substance which is essentially inorganic' we intend to include not only such inorganic binders as sodium silicate, potassium silicate and aluminium orthophosphate, but also such binders as ethyl silicate, whose organic content (the hydrolysable ethoxy radical) does not make any substantial contribution to the binder function. Such substances are to be contrasted with phenol formaldehyde resins and like organic binders.
Preferably, the cellulose fibres are bast fibres (cellulose fibres derived from the inner bark or the leaves of plants), such as jute and sisal.
The preferred heat-resistant inorganic particles are particles of ball clay.
Preferred proportions by dry weight of the predominant ingredients are: Heat resistant inorganic particles 3050% Binder substance 30-50% Cellulose fibre 225% The invention is further described with reference to the following Examples.
EXAMPLE 1 Silencer repair material is made by impregnating a commercially available felt of reclaimed jute fibre with a fluid composition as set out below, and drying the impregnated felt to a moisture content of about 30% by weight. For storage, the impregnated felt is sandwiched between two moisture impervious plastic foils. On removal from storage for sale, the foils are stripped off and the felt is slit into a number of bandages 30 mm wide.
The jute fibre felt employed for impregnation is suitably in the form of needled jute fibres (length range 2-1 00 mm) on a reinforcing scrim of woven jute yarns, of total weight 400 gram/m2.
The fluid composition for impregnating the felt is: % by weight A. Sodium silicate solution 71.4 = 28.5 solids (40% solids by weight; molar ratio SiO2: Na2O = 3:1) B. Ball clay 28.5 28.5 (bulk density, 900 kg/m3; particle size 83% < 1 ,um) C. Ethylene glycol 0.1 0.1 D. Water (from ingredient A) 42.9 100 100 The fluid composition just described is used in an amount such as to produce a silencer repair bandage containing 12.5% by weight of cellulose fibres (in the form of jute) at bandage moisture content 30%. This is equivalent to about 18% cellulose by weight of total solids, the corresponding proportion of the sodium silicate (binder substance) and ball clay (heat-resistant inorganic particles) being each about 40%.
The bandage is used in the conventional way; that is, it is moistened with water to make it more flexible, and tightly wrapped around, and moulded by hand round, the leaking section of an exhaust pipe or silencer.
EXAMPLE 2 Sisal fibres are chopped to a length of about 2 mm and mixed with aqueous sodium silicate solution, ball clay and ethylene glycol, to give a paste of this composition: % by weight sisal fibres 6.0 sodium silicate (solids) 1 7.5 ball clay 26.8 ethylene glycol 0.1 water 49.6 The paste is packed in an air-tight container. In use, it is applied by hand to patch defective exhaust piping or silencer on a vehicle. It can be used alone, or under the bandage of Example 1. It can also be used as flange sealant.

Claims (11)

1. Asbestos-free heat-settable sealant material suitable for application to pipework for the conveyance of hot gas, comprising a plastic matrix of heat-resistant inorganic particles admixed with an aqueous solution ar dispersion of binder substances which is essentially inorganic, said aqueous solution or dispersion containing a humectant to reduce the rate of water loss from the matrix during storage at ambient temperature and thus to preserve plasticity therein, said plastic matrix enclosing cellulose fibres which act as reinforcement for the matrix during heat-setting of the material.
2. Asbestos-free heat-settable sealant material according to claim 1, in which the heat-resistant inorganic particles are of ball clay.
3. Asbestos-free heat-settable sealant material according to claim 1 or 2, in which the cellulose fibres are bast fibres.
4. Asbestos-free heat-settable sealant material according to claim 3, in which the bast fibres are jute.
5. Asbestos-free heat-settable sealant material according to claim 3, in which the bast fibres are sisal.
6. Asbestos-free heat-settable sealant material according to any one of claims 1 to 5, in which the binder substance is an alkali metal silicate.
7. Asbestos-free heat-settable sealant material according to claim 6, in which the binder substance is sodium silicate.
8. Asbestos-free heat-settable sealant material according to any one of claims 1 to 7, having the following proportions by dry weight of the predominant ingredients.
Heat-resistant inorganic particles 3050% Binder substance 3050% Cellulose fibres 225%
9. Asbestos-free heat-settable sealant material according to any preceding claim, in the form of a flexible sheet or bandage.
10. Asbestos-free heat-settable sealant material according to claim 1, substantially as illustrated in Example 1.
11. Asbestos-free heat-settable sealant material according to claim 1, substantially as illustrated in Example 2.
GB8022534A 1979-07-14 1980-07-09 Asbestos-free heat-settable sealant material Expired GB2055857B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8022534A GB2055857B (en) 1979-07-14 1980-07-09 Asbestos-free heat-settable sealant material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7924625 1979-07-14
GB8022534A GB2055857B (en) 1979-07-14 1980-07-09 Asbestos-free heat-settable sealant material

Publications (2)

Publication Number Publication Date
GB2055857A true GB2055857A (en) 1981-03-11
GB2055857B GB2055857B (en) 1983-04-13

Family

ID=26272190

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8022534A Expired GB2055857B (en) 1979-07-14 1980-07-09 Asbestos-free heat-settable sealant material

Country Status (1)

Country Link
GB (1) GB2055857B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164071A (en) * 1984-09-05 1986-03-12 Tba Industrial Products Ltd Heat settable fibrous sealant material
GB2164070A (en) * 1984-09-05 1986-03-12 Tba Industrial Products Ltd Heat settable sealant material
FR3055133A1 (en) * 2016-08-19 2018-02-23 Akta Sas BINDER COMPOSITION FOR LOW DENSITY CONCRETE, SUCH AS HEMP CONCRETE, AND CORRESPONDING CONCRETE

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164071A (en) * 1984-09-05 1986-03-12 Tba Industrial Products Ltd Heat settable fibrous sealant material
GB2164070A (en) * 1984-09-05 1986-03-12 Tba Industrial Products Ltd Heat settable sealant material
US4664968A (en) * 1984-09-05 1987-05-12 Tba Industrial Products Limited Heat-settable sealant material
FR3055133A1 (en) * 2016-08-19 2018-02-23 Akta Sas BINDER COMPOSITION FOR LOW DENSITY CONCRETE, SUCH AS HEMP CONCRETE, AND CORRESPONDING CONCRETE

Also Published As

Publication number Publication date
GB2055857B (en) 1983-04-13

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PCNP Patent ceased through non-payment of renewal fee