GB2097416A - Heat-insulating sleeves for conducting tubes or pipes - Google Patents
Heat-insulating sleeves for conducting tubes or pipes Download PDFInfo
- Publication number
- GB2097416A GB2097416A GB8212146A GB8212146A GB2097416A GB 2097416 A GB2097416 A GB 2097416A GB 8212146 A GB8212146 A GB 8212146A GB 8212146 A GB8212146 A GB 8212146A GB 2097416 A GB2097416 A GB 2097416A
- Authority
- GB
- United Kingdom
- Prior art keywords
- weight
- heat
- insulating sleeve
- hose
- mixture
- 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
Links
- 239000000203 mixture Substances 0.000 claims abstract description 25
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004014 plasticizer Substances 0.000 claims abstract description 12
- 239000000945 filler Substances 0.000 claims abstract description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000000314 lubricant Substances 0.000 claims abstract description 9
- 239000003381 stabilizer Substances 0.000 claims abstract description 9
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 8
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 8
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 8
- 239000008117 stearic acid Substances 0.000 claims abstract description 8
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 5
- HHSPVTKDOHQBKF-UHFFFAOYSA-J calcium;magnesium;dicarbonate Chemical compound [Mg+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HHSPVTKDOHQBKF-UHFFFAOYSA-J 0.000 claims abstract description 4
- 238000004040 coloring Methods 0.000 claims abstract description 4
- XNGIFLGASWRNHJ-UHFFFAOYSA-N o-dicarboxybenzene Natural products OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- -1 phthalic acid ester Chemical class 0.000 claims abstract description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 5
- 239000000057 synthetic resin Substances 0.000 claims description 5
- UQLDLKMNUJERMK-UHFFFAOYSA-L di(octadecanoyloxy)lead Chemical compound [Pb+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O UQLDLKMNUJERMK-UHFFFAOYSA-L 0.000 claims description 4
- KEQXNNJHMWSZHK-UHFFFAOYSA-L 1,3,2,4$l^{2}-dioxathiaplumbetane 2,2-dioxide Chemical compound [Pb+2].[O-]S([O-])(=O)=O KEQXNNJHMWSZHK-UHFFFAOYSA-L 0.000 claims description 3
- 239000004135 Bone phosphate Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- ZVFDTKUVRCTHQE-UHFFFAOYSA-N Diisodecyl phthalate Chemical group CC(C)CCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC(C)C ZVFDTKUVRCTHQE-UHFFFAOYSA-N 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000001050 lubricating effect Effects 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 125000005498 phthalate group Chemical class 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/075—Arrangements using an air layer or vacuum the air layer or the vacuum being delimited by longitudinal channels distributed around the circumference of a tube
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Multicomponent Fibers (AREA)
Abstract
A heat-insulating sleeve for a conducting tube or pipe, e.g. a flexible metal tube in the form of a hose preferably having inwardly-projecting ribs running in the longitudinal direction of the hose and of tapering cross-section, the hose being made of a mixture comprising 35 to 60% by weight of polyvinyl chloride, 10 to 45% by weight of pure white, very finely particulate filler in the form of crystalline calcium carbonate and/or calcium magnesium carbonate, 20 to 30% by weight of at least one long- chain branched phthalic acid ester as plasticiser, 1 to 3% by weight of a lead-containing stabiliser, 0.25 to 0.6% by weight of a stearic acid-based lubricant, and optionally 0.2 to 0.3% by weight of titanium dioxide and traces of colouring matter. The particular materials used are cheaper and have other advantages over those previously used to produce heat- insulating sleeves.
Description
SPECIFICATION
Heat insulating sleeves for conducting tubes or pipes
The present invention relates to heat insulating sleeves for conducting tubes or pipes, in particular for flexible copper tubes.
It is known to provide a heat insulating sleeve for this purpose in the form of a synthetic resin hose having internally projecting ribs by means of which it is supported against the surface of the tube or pipe to be insulated, the ribs having a cross-section which tapers in the direction from the hose towards the tube or pipe and which are arranged sufficiently close to one another to form arched cavities with the inner surface of the hose, the synthetic resin hose comprising a mixture of polyvinyl chloride, filler, plasticiser, stabiliser and lubricant.
German Patent Specification No. 2,310,898 discloses such heat insulating sleeves for conducting tubes or pipes in which the synthetic resin hose consists of 40 to 60% by weight of polyvinyl chloride, 1 5 to 30% by weight of chalk as filler, 20 to 30% by weight of phthalic acid ester as softener, 2 to 5% by weight of leadcontaining stabilisers, and up to 1% by weight of lubricant. In this example, the filler is a surfacetreated amorphous chalk. This type of chalk is not pure white in colour (degree of whiteness determined by Elrepho green filter < 86).
Consequently, more than 1 per cent of a pigment in the form of titanium dioxide needs to be added to this known mixture as a "whitener". Titanium dioxide is, however, a very expensive raw material.
As plasticiser, a mixture of branched and mixed-straight chain phthalates is recommended.
These plasticisers have the disadvantage, however, that they vaporise under the influence of heat and consequently must be added to the mixture in large amounts; otherwise premature embrittlement occurs. A very long chain esterhard wax is preferred as lubricant. These lubricating waxes are also very expensive.
It is an object of the present invention to provide a heat-insulating sleeve made of a mixture which is substantially cheaper than the mixtures previously known for this purpose, but without any fall in quality. Since the heat-insulating sleeve is a mass-produced product, economising in the use of expensive raw materials is of great significance.
According to the invention, there is provided a heat-insulating sleeve for a conducting tube or pipe comprising a synthetic resin hose, adapted in use to surround a conducting tube or pipe in spaced relationship therewith, said hose being made of a mixture comprising 35 to 60% by weight of polyvinyl chloride; 10 to 45% by weight of a pure white, very finely particulate filler in the form of crystalline calcium carbonate, or crystalline calcium-magnesium carbonate or a mixture thereof; 20 to 30% by weight of a plasticiser consisting of at least one long-chain branched phthalic acid ester; 1 to 3% by weight of a lead-containing stabiliser; and 0.25 to 0.6% by weight of a stearic acid-based lubricant.
Preferably, the hose is provided with a plurality of longitudinally-extending internally-projecting ribs which in use abut against the outer surface of the tube or pipe to be insulated, so as to support the hose on the pipe, the ribs having a crosssection which tapers in the direction from the hose to the tube or pipe and spaced sufficiently closely to one another as to provide a plurality of arched recesses in the inner surface of the sleeve.
The amount of polyvinyl chloride is preferably from 40 to 45% by weight. The amount of the filler is preferably 30 to 35% by weight. The degree of whiteness of the filler as measured by using Elrepho green filter is preferably above 93.
The amount of plasticiser is preferably 20 to 25% by weight, and the plasticiser used is preferably diiso-decyl phthalate. The amount of leadcontaining stabiliser is preferably 2 to 2.5% by weight, and the stabiliser used is preferably tribasic lead sulphate. The lubricant is preferably a mixture of 0.2 to 0.4% by weight of lead stearate and 0.05 to 0.2% by weight of stearic acid. (All percentages are by weight of the total mixture.)
As a result of the use of a pure white filler in the form of crystalline calcium carbonate or calciummagnesium carbonate or a mixture of the two, a large amount of the expensive "whitener" titanium dioxide can be dispensed with.The average particle size of the filler used is expediently 3 ,um, with an upper cut of 10 ym and a portion of 35 per cent having a particle size of less than 2 ym. A long-chain branched phthalate used as plasticiser has a particularly low volatility under the influence of heat and also good resistance to cold. The low volatility means that the use of an excess of plasticiser in the mixture is unnecessary. The good resistance to cold means that the flexibility of the heat-insulating sleeve is not substantially impaired at low temperatures.
Lubricants having a stearic acid basis are considerably cheaper than the very expensive ester-hard wax and do not reduce the internal and external lubricating action of the mixture. Whilst the lead stearate increases both the internal and external lubricating effects, the stearic acid basically acts to increase the external lubricating effect. An increase in both the internal and external lubricating effects allows higher extrusion speeds to be used, and provides the heatinsulating sleeve with a smooth outer appearance.
In a particularly favourable form of the invention, 0.2 to 0.3% by weight of titanium dioxide and possibly traces of colouring matters are added to the mixture. The addition of titanium dioxide renders the mixture non-transparent, i.e.
an opaque appearance is produced. Colouring matters are added if the sleeve is required to have a colour other than white.
The invention is illustrated by the following example.
In a mixer, 42% by weight of S-polyvinyl chloride, 32% by weight of calcite (calcium carbonate), 25% by weight of di-iso-decyl phthalate, 2.3% by weight of tribasic lead sulphate, 0.3% by weight of lead stearate, 0.1 5% by weight of stearic acid, and 0.25% by weight of titanium dioxide are mixed together, and are introduced into an extruder in the form of a saturated mass ("wet snow") and plasticised therein at 1800 At Atthe end of the extruder screw, the plastic mass is pressed against a perforated plate and granulated by means of a cutting device known per se. The granulate formed in this way is cooled, introduced into the funnel of an extruder, and extruded through a transverse extrusion head onto a continuously moving copper tube. The extrusion speed is 50 m/min, and the outer surface of the extruded sleeve is extremely smooth.
Claims (14)
1. A heat-insulating sleeve for a conducting tube or pipe comprising a synthetic resin hose, adapted in use to surround a conducting tube or pipe in spaced relationship therewith, said hose being made of a mixture comprising 35 to 60% by weight of polyvinyl chloride; 10 to 45% by weight of a pure white, very finely particulate filler in the form of crystalline calcium carbonate, or crystalline calcium-magnesium carbonate or a mixture thereof; 20 to 30% by weight of a plasticiser consisting of at least one long-chain branched phthalic acid ester; 1 to 3% by weight of a lead-containing stabiliser; and 0.25 to 0.6% by weight of a stearic acid-based lubricant.
2. A heat-insulating sleeve as claimed in
Claim 1, wherein said hose is provided with a plurality of internally-projecting ribs adapted in use to abut against the outer surface of a tube or pipe to be insulated so as to support said hose on said tube or pipe, said ribs having a cross-section which tapers in the direction from the hose to the tube or pipe to be insulated and being so closely spaced as to provide a plurality of arched recesses in the inner surface of the hose.
3. A heat-insulating sleeve as claimed in
Claim 1 or Claim 2, wherein said mixture contains from 40 to 45% by weight of polyvinyl chloride.
4. A heat-insulating sleeve as claimed in any one of Claims 1 to 3, wherein said mixture contains 30 to 35% by weight of filler.
5. A heat-insulating sleeve as claimed in any one of the preceding Claims, wherein said mixture contains 20 to 25% by weight of plasticiser.
6. A heat-insulating sleeve as claimed in any one of the preceding Claims, wherein said plasticiser is di-iso-decyl phthalate.
7. A heat-insulating sleeve as claimed in any one of the preceding Claims, wherein said mixture
contains 2 to 2.5% by weight of stabiliser.
8. A heat-insulating sleeve as claimed in any one of the preceding Claims, wherein said stabiliser is tribasic lead sulphate.
9. A heat-insulating sleeve as claimed in any one of the preceding Claims, wherein said lubricant is a mixture of 0.2 to 0.4% by weight of lead stearate and 0.05 to 0.2% by weight of stearic acid.
10. A heat-insulating sleeve as claimed in any one of the preceding Claims, wherein said mixture additionally contains from 0.2 to 0.3% by weight of titanium dioxide.
11. A heat-insulating sleeve as claimed in any one of the preceding Claims, wherein said mixture additionally contains a trace or traces of one or more colouring matters.
12. A heat-insulating sleeve for a conducting tube or pipe, substantially as hereinbefore described with reference to the example.
13. A conducting tube or pipe, provided with a heat-insulating sleeve as claimed in any one of
Claims 1 to 12.
14. A flexible copper tube provided with a heatinsulating sleeve as claimed in any one of Claims 1 to 12.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813116784 DE3116784A1 (en) | 1981-04-28 | 1981-04-28 | "HEAT-INSULATING COVER FOR PIPES" |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2097416A true GB2097416A (en) | 1982-11-03 |
| GB2097416B GB2097416B (en) | 1984-09-26 |
Family
ID=6130977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8212146A Expired GB2097416B (en) | 1981-04-28 | 1982-04-27 | Heat insulating sleeves for conducting tubes or pipes |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE892982A (en) |
| DE (1) | DE3116784A1 (en) |
| FR (1) | FR2504646B1 (en) |
| GB (1) | GB2097416B (en) |
| IT (1) | IT1150775B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0693355B1 (en) * | 1994-07-22 | 2000-11-15 | The Geon Company | High output twin screw extrusion process |
| EP0732533B2 (en) † | 1995-03-16 | 2003-05-21 | KM Europa Metal Aktiengesellschaft | Conduit having a thermally and/or acoustically insulating sleeve |
| US8739835B2 (en) | 2009-09-22 | 2014-06-03 | Great Lakes Copper Inc. | Fluid transfer device having leak indication and method of making same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1036975A1 (en) * | 1999-03-18 | 2000-09-20 | Boliden Cuivre & Zinc S.A. | Copper pipe sheathed with a stabilised resin |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB716087A (en) * | 1951-10-30 | 1954-09-29 | Gen Electric | Improvements in and relating to insulation for electrical conductors |
| BE562069A (en) * | 1957-10-24 | 1960-05-20 | ||
| FR1240034A (en) * | 1959-07-22 | 1960-09-02 | Sheathed and thermally insulated tube, especially for domestic water pipes | |
| DE1769343B2 (en) * | 1968-05-11 | 1979-06-21 | Kabel- Und Metallwerke Gutehoffnungshuette Ag, 3000 Hannover | Fire-proof covering for electrical cables and lines |
| DE2310898C3 (en) * | 1973-03-05 | 1983-01-05 | Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover | Thermally insulating sheath for conduit pipes |
| IT1007803B (en) * | 1974-04-09 | 1976-10-30 | Montedison Spa | POLYMERIC COMPOSITIONS PLASTIFI CATE BASED ON VINYL CHLORINE POLYMERS WITH GOOD PHYSICAL-MECHANICAL CHARACTERISTICS AND WITH EC CELLENT ELECTRICAL INSULATION CHARACTERISTICS EVEN AT HIGH TEMPERATURE |
| DE2461013C3 (en) * | 1974-12-21 | 1982-01-07 | Wieland-Werke Ag, 7900 Ulm | Thermally insulated composite pipe consisting of a metal pipe and a plastic jacket |
-
1981
- 1981-04-28 DE DE19813116784 patent/DE3116784A1/en not_active Withdrawn
-
1982
- 1982-03-11 FR FR8204115A patent/FR2504646B1/en not_active Expired
- 1982-04-06 IT IT20601/82A patent/IT1150775B/en active
- 1982-04-27 GB GB8212146A patent/GB2097416B/en not_active Expired
- 1982-04-27 BE BE0/207931A patent/BE892982A/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0693355B1 (en) * | 1994-07-22 | 2000-11-15 | The Geon Company | High output twin screw extrusion process |
| EP0732533B2 (en) † | 1995-03-16 | 2003-05-21 | KM Europa Metal Aktiengesellschaft | Conduit having a thermally and/or acoustically insulating sleeve |
| US8739835B2 (en) | 2009-09-22 | 2014-06-03 | Great Lakes Copper Inc. | Fluid transfer device having leak indication and method of making same |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8220601A0 (en) | 1982-04-06 |
| IT1150775B (en) | 1986-12-17 |
| GB2097416B (en) | 1984-09-26 |
| FR2504646A1 (en) | 1982-10-29 |
| DE3116784A1 (en) | 1982-11-11 |
| BE892982A (en) | 1982-10-27 |
| FR2504646B1 (en) | 1985-09-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |