EP1007196A1 - A composition comprising a fine powder - Google Patents

A composition comprising a fine powder

Info

Publication number
EP1007196A1
EP1007196A1 EP98904278A EP98904278A EP1007196A1 EP 1007196 A1 EP1007196 A1 EP 1007196A1 EP 98904278 A EP98904278 A EP 98904278A EP 98904278 A EP98904278 A EP 98904278A EP 1007196 A1 EP1007196 A1 EP 1007196A1
Authority
EP
European Patent Office
Prior art keywords
composition
fine powder
particulate material
coating agent
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Withdrawn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
EP98904278A
Other languages
German (de)
French (fr)
Inventor
Richard Tanton
Brent Swaisland
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.)
Saitron Ltd
Original Assignee
Saitron 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 Saitron Ltd filed Critical Saitron Ltd
Publication of EP1007196A1 publication Critical patent/EP1007196A1/en
Withdrawn legal-status Critical Current

Links

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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/12—Multiple coating or impregnating
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation

Definitions

  • the present invention relates to a composition comprising a fine powder and more particularly, though not exclusively, to a composition in which the fine powder is a colorant.
  • Such compositions have particular use in the construction industry for colouring building materials, particularly cementitious products, mortar, asphalt and tarmac.
  • GB2291600 discloses a mix comprising a colourant powder and a particulate material, for example, sand, which mix has improved flowability
  • Airborne powder can give rise to health problems, losses and cause cross contamination thereby affecting the quality of coloured products.
  • Granular versions of pigments have also been produced and are typically made by a process involving pre-dispersion followed by spray drying. This process is very expensive and is suitable only for long runs and large
  • the granules are often not of a particularly resilient nature and tend to break down easily on handling, conveying and metering. This has the effect of re-creating the dust and handling problems associated with 'powders' .
  • fine powder is releasably bound to the particulate material with a
  • the coating agent is a liquid, more preferably a wetting-agent and more preferably still a non-drying wetting agent.
  • the coating agent functions by displacing the air from about the particle, maximising the amount
  • the preferred coating agents comprise hydrophilic groups the fine powder can be easily displaced from the particle by the addition of water.
  • the fine powder will typically have a particle size (diameter) of from O.Ol ⁇ to 10 ⁇ .
  • the fine powder is preferably a colourant and may comprise one or more pigments such as, for example, red iron oxide, yellow iron oxide, black iron oxide, carbon and phthalocyanine blues-greens etc.
  • the particulate material will typically have a particle size (diameter) of greater than 20 ⁇ . More preferably it will have a particle size (diameter) ranging from 20 ⁇ - 500 ⁇ with a mean particle size (diameter) of about lOO ⁇ .
  • the particulate material is preferably an ingredient of the end product to be produced.
  • Preferred particulate materials for use in a composition for use in the building industry include sand and limestone, although other particulate materials, such as microsphere, which have little or no effect on the properties of the end product can be used.
  • the end products to be produced for use in the building industry include, for example, paving blocks, roof tiles or bricks, and will typically contain 0.5 to 5 % by weight of a colorant.
  • the coating agent is added in an amount of 0.1 to 15 % by weight based on the weight of the composition.
  • the coating agent allows the particulate material to be wholly or partially coated by the fine powder, alleviating many of the problems associated with the use of fine powders.
  • the preferred coating agents are wetting agents, more particularly non- drying wetting agents and more particularly still surfactants.
  • Preferred coating agents are carboxylated surfactants, sorbitan esters, alcohol ethoxylates, alkylphenol ethoxylates and sulphonates.
  • a method of preparing a composition of the invention comprising wetting the particulate material with a coating agent and releasably binding the fine powder to the coated particulate material.
  • the fine powder is coated to the particulate material using a coating agent in an amount of 0.1 to 15% by weight based on the weight of the composition.
  • the coating agent is an ethoxylated surfactant.
  • a method of producing a product for use in the building industry, comprising from 1-5 % by weight of a fine powder and one or more other ingredients characterised in that the fine powder is added to the other ingredients as a composition of the invention.
  • the particulate material (sand) was placed in a low intensity mixing chamber, the coating agent (ethoxylated surfactant) added, mixed and the fine powder (colourant) gradually added.
  • the components were subjected to further mixing and then packaged. Mixing was by way of a tumbling action and at a circumferential speed of between 0.2 - 1.2 metres per second, more preferably at 0.7 m sec "1 .
  • Samples of each composition were placed in a clear plastic vial, shaken and the degree of "dusting" determined visually.
  • the samples were characterised on a scale of 1 to 5. 1 was used if the vial wall remained clear on shaking, indicating a lack of dusting (good coating of fine powder (colorant) to particulate (sand)) and 5 was used if a dense layer of fine powder formed on the vial wall on shaking (poor coating of fine powder (colorant) to particulate (sand)).
  • the bulk density was also determined and is given as the amount in Kgs occupied by 1 litre volume.
  • single coating agent could be replaced by a number of components so long as the fine powder is releasably bound to the particulate material such that the fine powder can be readily dissolved or dispensed in water.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Cosmetics (AREA)

Abstract

The present invention relates to a composition comprising a fine powder and more particularly, though not exlusively, to a composition in which the fine powder is a colorant. Such compositions have particular use in the construction industry for colouring building materials, particularly cementitious products, mortar, asphalt and tarmac. The composition comprises a fine powder and a particulate material, the fine powder being releasably bound to the particulate material with a coating agent. The invention also discloses a method of making the composition and a method of making an end product with the composition.

Description

DESCRIPTION A COMPOSITION COMPRISING A FINE POWDER
The present invention relates to a composition comprising a fine powder and more particularly, though not exclusively, to a composition in which the fine powder is a colorant. Such compositions have particular use in the construction industry for colouring building materials, particularly cementitious products, mortar, asphalt and tarmac.
It will, however, be appreciated that the invention disclosed, whilst exemplified with reference to colorants as the fine powders, could be applied to other situations where the handling of a fine power is subject to the problems outlined below with reference to colorants.
GB2291600 discloses a mix comprising a colourant powder and a particulate material, for example, sand, which mix has improved flowability
and is less likely to block, for example pneumatic and mechanical conveying lines than a colourant powder per se.
Whilst the mix is a considerable improvement over the use of a colourant powder it is not ideal as the fine powder in the mixture can still
cause blockage and can become airborne. Pigment loadings are also restricted.
Airborne powder can give rise to health problems, losses and cause cross contamination thereby affecting the quality of coloured products.
Because of these problems, the industry has tried using liquid colourants. These are considerably more expensive than powders and suffer a
number of drawbacks including settlement. They are also prone to freeze in winter, are messy if spilt and can't be used with wet aggregates in concrete
block pavings.
Granular versions of pigments have also been produced and are typically made by a process involving pre-dispersion followed by spray drying. This process is very expensive and is suitable only for long runs and large
batches of single colours. The granules are often not of a particularly resilient nature and tend to break down easily on handling, conveying and metering. This has the effect of re-creating the dust and handling problems associated with 'powders' .
It is an aim of the present invention to provide a composition which overcomes one or more of the problems associated with fine powder products
of the art.
According to one aspect of the present invention there is provided a
composition comprising a fine powder and a particulate material characterised
in that the fine powder is releasably bound to the particulate material with a
coating agent.
Preferably the coating agent is a liquid, more preferably a wetting-agent and more preferably still a non-drying wetting agent. The coating agent functions by displacing the air from about the particle, maximising the amount
of fine powder that can be bound thereto.
Since the preferred coating agents comprise hydrophilic groups the fine powder can be easily displaced from the particle by the addition of water.
The fine powder will typically have a particle size (diameter) of from O.Olμ to 10μ.
The fine powder is preferably a colourant and may comprise one or more pigments such as, for example, red iron oxide, yellow iron oxide, black iron oxide, carbon and phthalocyanine blues-greens etc.
The particulate material will typically have a particle size (diameter) of greater than 20μ. More preferably it will have a particle size (diameter) ranging from 20μ - 500μ with a mean particle size (diameter) of about lOOμ.
The particulate material is preferably an ingredient of the end product to be produced. Preferred particulate materials for use in a composition for use in the building industry include sand and limestone, although other particulate materials, such as microsphere, which have little or no effect on the properties of the end product can be used. In this regard the end products to be produced for use in the building industry include, for example, paving blocks, roof tiles or bricks, and will typically contain 0.5 to 5 % by weight of a colorant.
It is preferred to maximise the amount of fine powder relative to the particulate material to reduce transport costs ie. attain greater than 1: 1 by weight loadings of fine powder: particulate. To achieve this aim, the coating agent is added in an amount of 0.1 to 15 % by weight based on the weight of the composition.
The coating agent allows the particulate material to be wholly or partially coated by the fine powder, alleviating many of the problems associated with the use of fine powders.
Because of the nature of the colourants used in producing cementicious products and their manufacturing processes it has been found that a coating agent which enables the fine powder to be releasably bound to the particulate material such that the fine powder can be released in an aqueous environment is preferred.
The preferred coating agents are wetting agents, more particularly non- drying wetting agents and more particularly still surfactants. Preferred coating agents are carboxylated surfactants, sorbitan esters, alcohol ethoxylates, alkylphenol ethoxylates and sulphonates.
Of these ethoxylated sorbitan esters with a high degree of ethoxylation i.e. those with an ethylene oxide content of 10-20 have been found to be particularly good.
According to a further aspect of the present invention there is provided a method of preparing a composition of the invention comprising wetting the particulate material with a coating agent and releasably binding the fine powder to the coated particulate material.
The fine powder is coated to the particulate material using a coating agent in an amount of 0.1 to 15% by weight based on the weight of the composition.
Preferably the coating agent is an ethoxylated surfactant.
According to a further aspect of the present invention there is provided a method of producing a product, for use in the building industry, comprising from 1-5 % by weight of a fine powder and one or more other ingredients characterised in that the fine powder is added to the other ingredients as a composition of the invention.
The invention will be further described, by way of example only, with reference to the following methods of manufacture, compositions and test data.
Method of Production
The particulate material (sand) was placed in a low intensity mixing chamber, the coating agent (ethoxylated surfactant) added, mixed and the fine powder (colourant) gradually added. The components were subjected to further mixing and then packaged. Mixing was by way of a tumbling action and at a circumferential speed of between 0.2 - 1.2 metres per second, more preferably at 0.7 m sec"1.
Composition 1
% by weight
Fine Powder red iron oxide 45 natural ion oxide 5
Particulate sand 49
Coating agent
Sorbitan ester 1
Composition 2
% by weight Red Iron Oxide 85 Sand 7.5 Sorbitan Ester 7.5
Composition 3
% by weight
Yellow Iron Oxide 66
Sand 28
Sorbitan Ester 6
Composition 4
% by weight
Phthalocyanine Green 9.1
Sand 86.9
Sorbitan Ester 4.0
Composition 5
% by weight
Chrome Green 48 Sand 48 Sorbitan Ester 4
Composition 6
% by weight
Red Iron Oxide 80
Sand 17
Alcohol Ethoxylate 8
Composition 7
% by weight Black Iron Oxide 80
Sand 11
Alcohol Ethoxylate 9
Comparative Example 1
% by weight
Red Iron Oxide 40 Sand 60
Comparative Example 2
% by weight
Red Iron Oxide 50 Sand 50
Comparative Example 3
% by weight
Red Iron Oxide 60 Sand 40
Test
Samples of each composition were placed in a clear plastic vial, shaken and the degree of "dusting" determined visually. The samples were characterised on a scale of 1 to 5. 1 was used if the vial wall remained clear on shaking, indicating a lack of dusting (good coating of fine powder (colorant) to particulate (sand)) and 5 was used if a dense layer of fine powder formed on the vial wall on shaking (poor coating of fine powder (colorant) to particulate (sand)).
The bulk density was also determined and is given as the amount in Kgs occupied by 1 litre volume.
The results are shown in the table below.
Composition No Dust Factor Bulk :
1 1 1.4
2 2 1.2
3 2 1.2
4 1 1.3
5 1 1.2
6 1 1.3
7 2 1.4
Comparative 1 3/4 1.2
Comparative 2 4/5 1.2
Comparative 3 5 + 1.2
Of course it will be apparent to the man skilled in the art that a
single coating agent could be replaced by a number of components so long as the fine powder is releasably bound to the particulate material such that the fine powder can be readily dissolved or dispensed in water.

Claims

1. A composition comprising a fine powder and a particulate material characterised in that the fine powder is releasably bound to the particulate material with a coating agent.
2. A composition as claimed in claim 1 wherein the coating agent is a liquid.
3. A composition as claimed in claim 1 or 2 wherein the coating agent
is a wetting agent.
4. A composition as claimed in claim 3 wherein the wetting agent is
non-drying.
5. A composition as claimed in any of the preceding claims wherein
the coating agent is a surfactant.
6. A composition as claimed in any of the preceding claims wherein the coating agent is an ethoxylated sorbitan ester.
7. A composition as claimed in claim 6 wherein the ethoxylated
sorbitan ester has an ethylene oxide content of 10 - 20.
8. A composition as claimed in any of the preceding claims in which
the particulate material is partially coated with the fine powder.
9. A composition as claimed in any of claims 1 to 7 wherein the
particulate material is wholly coated with the fine powder.
10. A composition as claimed in any of the preceding claims wherein the fine powder is a colourant.
11. A composition as claimed in claim 10 wherein the colourant comprises one or more pigments selected from the group consisting of: red iron oxide, yellow iron oxide, black iron oxide, carbon and phthalocyanine blue-green.
12. A composition as claimed in any of the preceding claims wherein the fine powder has an average diameter of from O.Ol╬╝ to 10╬╝.
13. A composition as claimed in any of the preceding claims wherein the particulate material has an average diameter greater than 20╬╝.
14. A composition as claimed in any of the preceding claims wherein the particulate material has an average diameter of from 20╬╝ to 500╬╝.
15. A composition as claimed in any of the preceding claims wherein the particulate material has an average diameter of about lOO╬╝.
16. A composition as claimed in any of the preceding claims wherein the particulate material is selected from the group consisting of sand, limestone
and microspheres.
17. A composition as claimed in any of the preceding claims wherein the ratio (weight: weight) of fine powder to particulate material is greater than 1 part fine powder to 1 part particulate material.
18. A composition as claimed in any of the preceding claims wherein the coating agent is present in an amount of from 0.1 to 15 % by weight based on the total weight of the composition.
19. A method of preparing a composition as claimed in any of claims 1 to 18 comprising wetting the particulate material with a coating agent and releasably binding the fine powder to the coated particulate material.
20. A method as claimed in claim 19 comprising sequentially adding, with mixing, to the particulate material first the coating agent and then the fine powder.
21. A method as claimed in claim 19 or 20 wherein the mixing step is conducted in a slow speed mixer at a circumferential speed of from 0.2 to 1.2
m sec"1.
22. A method of producing a product, for use in the building industry,
comprising from 0.5 - 5 % by weight of a fine powder and one or more other ingredients characterised in that the fine powder is added to the other
ingredients as a composition as claimed in any of claims 1 to 18.
23. A method as claimed in claim 22 wherein the product is a concrete
product, mortar, asphalt or tarmac.
24. A method as claimed in claim 23 wherein the concrete product is a paving block, roof tile or brick.
EP98904278A 1997-02-15 1998-02-13 A composition comprising a fine powder Withdrawn EP1007196A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9703195.9A GB9703195D0 (en) 1997-02-15 1997-02-15 A composition comprising a fine powder
GB9703195 1997-02-15
PCT/GB1998/000457 WO1998035750A1 (en) 1997-02-15 1998-02-13 A composition comprising a fine powder

Publications (1)

Publication Number Publication Date
EP1007196A1 true EP1007196A1 (en) 2000-06-14

Family

ID=10807759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98904278A Withdrawn EP1007196A1 (en) 1997-02-15 1998-02-13 A composition comprising a fine powder

Country Status (6)

Country Link
EP (1) EP1007196A1 (en)
CN (1) CN1116101C (en)
AU (1) AU737286B2 (en)
GB (2) GB9703195D0 (en)
HK (1) HK1026382A1 (en)
WO (1) WO1998035750A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007095187A2 (en) 2006-02-13 2007-08-23 Trustees Of Boston University Compositions and methods for antibiotic potentiation and drug discovery
WO2010105165A1 (en) * 2009-03-12 2010-09-16 Sun Chemical Corporation Polymer bound organic pigment and substrate composites and process for making

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835602A (en) * 1957-11-22 1958-05-20 Roland G Benner Cementitious mixes
GB2095227B (en) * 1981-03-24 1985-05-01 Cempol Sales Making lightweight concrete
JPS63139039A (en) * 1986-12-01 1988-06-10 ホソカワミクロン株式会社 Method of coloring gypsum
DD254336A1 (en) * 1986-12-09 1988-02-24 Akad Wissenschaften Ddr METHOD FOR PRODUCING A TRANSPORTABLE POWDER MIXTURE
CH681541A5 (en) * 1990-03-03 1993-04-15 Sandoz Ag
FR2662155B1 (en) * 1990-05-18 1993-12-24 Fibrasa Holding Sa LIGHT AGGREGATES FOR LIGHTWEIGHT CONCRETE, THEIR PROCESS FOR OBTAINING AS WELL AS A MIXER FOR THE IMPLEMENTATION OF THIS PROCESS.
WO1996001175A1 (en) * 1994-07-05 1996-01-18 Mass Measuring Systems Limited Method for preparing a mix

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9835750A1 *

Also Published As

Publication number Publication date
HK1026382A1 (en) 2000-12-15
GB2337052A (en) 1999-11-10
GB9703195D0 (en) 1997-04-02
WO1998035750A1 (en) 1998-08-20
AU737286B2 (en) 2001-08-16
GB9919043D0 (en) 1999-10-13
CN1247484A (en) 2000-03-15
CN1116101C (en) 2003-07-30
GB2337052B (en) 2001-01-17
AU6222498A (en) 1998-09-08

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