GB2049429A - Process for preparing composite granules - Google Patents
Process for preparing composite granules Download PDFInfo
- Publication number
- GB2049429A GB2049429A GB8012924A GB8012924A GB2049429A GB 2049429 A GB2049429 A GB 2049429A GB 8012924 A GB8012924 A GB 8012924A GB 8012924 A GB8012924 A GB 8012924A GB 2049429 A GB2049429 A GB 2049429A
- Authority
- GB
- United Kingdom
- Prior art keywords
- process according
- pulverulent material
- granular substrate
- granules
- composite granules
- 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
- 239000008187 granular material Substances 0.000 title claims abstract description 34
- 239000002131 composite material Substances 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000000758 substrate Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 23
- 150000003839 salts Chemical class 0.000 claims abstract description 14
- 229910017053 inorganic salt Inorganic materials 0.000 claims abstract description 13
- 239000004009 herbicide Substances 0.000 claims abstract description 9
- 239000000575 pesticide Substances 0.000 claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 7
- 230000002363 herbicidal effect Effects 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 5
- -1 alkali metal borates Chemical class 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- RDMZIKMKSGCBKK-UHFFFAOYSA-N disodium;(9,11-dioxido-5-oxoboranyloxy-2,4,6,8,10,12,13-heptaoxa-1,3,5,7,9,11-hexaborabicyclo[5.5.1]tridecan-3-yl)oxy-oxoborane;tetrahydrate Chemical group O.O.O.O.[Na+].[Na+].O1B(OB=O)OB(OB=O)OB2OB([O-])OB([O-])OB1O2 RDMZIKMKSGCBKK-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 229910021532 Calcite Inorganic materials 0.000 claims description 2
- 239000003337 fertilizer Substances 0.000 claims description 2
- 239000004579 marble Substances 0.000 claims description 2
- 239000000417 fungicide Substances 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000004480 active ingredient Substances 0.000 description 9
- 238000010410 dusting Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005507 spraying Methods 0.000 description 4
- MXWJVTOOROXGIU-UHFFFAOYSA-N atrazine Chemical compound CCNC1=NC(Cl)=NC(NC(C)C)=N1 MXWJVTOOROXGIU-UHFFFAOYSA-N 0.000 description 3
- 239000003085 diluting agent Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000012254 powdered material Substances 0.000 description 3
- 239000012266 salt solution Substances 0.000 description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000003701 inert diluent Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- CTSLUCNDVMMDHG-UHFFFAOYSA-N 5-bromo-3-(butan-2-yl)-6-methylpyrimidine-2,4(1H,3H)-dione Chemical compound CCC(C)N1C(=O)NC(C)=C(Br)C1=O CTSLUCNDVMMDHG-UHFFFAOYSA-N 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000000855 fungicidal effect Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- NVIFVTYDZMXWGX-UHFFFAOYSA-N sodium metaborate Chemical compound [Na+].[O-]B=O NVIFVTYDZMXWGX-UHFFFAOYSA-N 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/26—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests in coated particulate form
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/40—Fertilisers incorporated into a matrix
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Pest Control & Pesticides (AREA)
- General Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Chemical & Material Sciences (AREA)
- Plant Pathology (AREA)
- Toxicology (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
A process for preparing composite granules is disclosed which comprises mixing a granular substrate and a pulverulent material with an aqueous solution of an inorganic salt which forms a non-hygroscopic hydrated salt in the presence of the pulverulent material. The pulverulent material is thereby firmly attached to the hydrated salt crystallised on the surface of the granular substrate, and the resulting composite granules are dried. A particular application of the process is for the preparation of fertilisers, herbicides, fungicides and pesticides.
Description
SPECIFICATION
Process for preparing composite granules
This invention relates to a process for preparing composite granules. More particularly, this invention relates to a process for preparing composite granules whereby the adherence of a pulverulent material to granular substrates is improved. A particular application of the process of the invention is in the agricultural field and in particular in connection with fertilisers, herbicides, fungicides and pesticides. Such materials are often compounded with solid diluents such as talc or chalk in a finely divided state for the purpose of spraying on crops or on ground which has been sown.A problem which arises with the spraying or other distribution of such materials in finely divided form is that the resulting dust particles readily become airborne and hazardous to the operator and also thatthey may settle in unwanted locations, e.g. on growing crops.
Various proposals have therefore been made for the compounding of such pulverulent materials in a granular as opposed to finely divided form. Thus, granules have been made by the compacting of powdered material with or without additional inert diluents. Alternatively, the active ingredients in finely divided form have been mixed with an inert filler and water and the product has thereafter been extruded and granulated to the desired granular size.
One problem which has, however, arisen in practice with such proposals is that the granular materials have often fractured either during manufacture or during subsequent handling, thereby creating again the problem of dusting.
Accordingly, there have been alternative proposals which have involved the use of a so-called strong or fracture-resistant substrate upon which the desired active ingredient or ingredients have been coated with or without additional inert diluents also in finely divided form. Thus, coating processes have been proposed which use so-called "strong" substrates on which glues, oils or waxes had been either absorbed or adsorbed thereby producing surfaces on which the powdered active ingredient optionally together with a powdered diluent would adhere. It has, however, been found in practice that granules made by using aqueous glues need considerable periods of time for drying before they become free flowing and the use of non-aqueous adherents involved the risk of a delay in the release of active ingredient from the granule.Furthermore dusting problems have not been overcome.
We have found what we believe to be both a novel and an effective way of forming composite granules from finely divided or powdered materials. The method of the invention has been evolved from our discovery that such a pulverulent material can be firmly attached to the surface of a granular substrate by the crystallisation on the surface of certain non-hygroscopic hydrated salts which entrap the powdered material.
Thus, the present invention provides a process for preparing composite granules comprising a granular substrate and a pulverulent material which compris
es contacting the granular substrate and the pulveru
lent material with an aqueous solution of at least one
inorganic salt which forms a non-hygroscopic hydrated salt in the presence of the pulverulent
material whereby the pulverulent material is
attached to the hydrated salt crystallised on the surface of the granular substrate, and drying the
resulting composite granules.
According, in the process of this invention the surface of a granular substrate is coated with an.
inorganic salt or salts from an aqueous solution which form thereon such non-hygroscopic hydrated salt or salts in the presence of the pulveru lent material. The pulverulent material is thereby firmly attached to the hydrated salt or salts crystallised on the surface of the substrate granules to form the desired composite granules which are then dried.
We preferthatthe granular substrate and in particular the composite granules should have physical characteristics which enable them to be resistantto dusting and to fracturing during normal packing and storage procedures.
A preferred substrate material is for example a naturally occurring mineral such as limestone, calcite or marble; these are commercially available and economic to use in comparison with materials which have to be prepared by manufacturing techniques such as extrusion.
The substrate granules may be prepared for example by crushing and sieving the mineral and retaining the desired size fraction. The preferred particle size of the granules used in the process of the invention may range from 4,000 microns (4 BS mesh) to 250 microns (60 BS mesh). A particularly preferred size is substantially 1000 microns (16 BS mesh).
Preferred inorganic salts are alkali metal borates and mixtures thereof. In particular, those alkali metal borates which are most soluble in water are suitable for use in the process according to the invention. For example, Polybor (Trade Mark) which is disodium octaborate tetrahydrate is particularly suitable for use as the inorganic salt. The alkali metal borates are preferably heated to above 60"C in order to ensure good solubility.
According to one aspect of the present invention an inorganic salt or mixture of salts in finely divided form may be added to the other components in dry form before spraying with the inorganic salt solution.
The amount of inorganic salt used in the process of the invention depends on the particle size of the granules employed but is usually in the range of 1-20% by weight of the granules. Typically, for granules of above 1000 microns in size, an amount of inorganic salt representing substantially 2% of the weight of granules is used.
One advantage of the method of the invention is that the products are dry and suitable for packaging in a short period of time as compared with various prior proposals. A second advantage is that the active ingredient used is immediately available to the environment on which it is sited.
The process of the invention is preferably carried out in a rotating drum type of mixer, although it will be apparent that any type of conventional mixer which is capable of effecting the overall distribution of the pulverulent material on the surface of the granules may be used. We have found that a mixing time of substantially 15 minutes in a rotating drum mixer may be sufficient to prepare the product of the invention. Pulverulent material is dry mixed with the granules prior to adding the inorganic salt solution.
In order to ensure even distribution, the inorganic salt solution must be added slowly to the components preferably by spraying directly on to the materials being mixed.
it has been found to be beneficial to add a surface-active agent. The addition of up to 5% of surface-active agent based on the weight of water employed is preferred.
Any pulverulent material which is not affected by the chemicals used in the process of the invention may be caused to adhere to the granular substrate which we have defined above. In particular, as stated above, we have found that the method of the invention is particularly suited to the development of composite granules for use as herbicides fertilisers and pesticides. The active ingredient in powdered form either alone or together with one or more similar powdered solid diluents may be for example a fertiliser in finely divided form or a powdered herbicide, fungicide or pesticide. Typically, the substrate granules may be coated with an active ingredient which represents up to 10% of the weight of the substrate. In the case of a herbicide for example, the active ingredient may be present in any proportion from 1-8% of the weight of the composite granule as a whole.
The invention described in general terms above is
now further described and illustrated by the follow
ing examples of specific embodiments of the processes of the invention.
Example 1
150 kg of limestone granules having a particle size
of about 1000 microns were mixed with 6.96 kg of
Atrazine herbicide having a particle size of less than
about 90 microns and 0.15 kg EMPICOL (Trade Mark) for an anionic surface active agent in a rotating drum
mixer. A solution comprising 2.7 kg of POLYBOR
(Trade Mark for disodium octaborate tetrahydrate) in
4.051 water at 75-80 C was sprayed on to the well
mixed ingredients over a period often minutes.
Mixing was continued for 15 minutes. The resulting
product comprised free flowing, non-dusting gra
nules suitable for packing. No caking of the packed
product was observed after storage for one week.
Example 2
The procedure followed was similar to that de
scribed in Example 1 except 6.96 kg Atrazine was
replaced by 6.96 kg Bromacil herbicide. A similar
product to that described in Example 1 was
obtained.
Example 3
1 kg of fine grade limestone granules as described
in Example 1 was mixed with 36g of sodium
metaborate of less than 250 microns in size, 40g of finely divided Atrazine and 1g of EMPICOL in a rotating drum mixer. A solution at750C comprising 48.29 of POLYBOR in 60g water was sprayed on to the mixed ingredients over a period of 10 minutes.
Stirring was continued for 1 hour.
The resulting product comprised discrete granules with an evenly distributed coating of herbicide, was free flowing and non-dusting.
Claims (10)
1. A process for preparing composite granules comprising a granular substrate and a pulverulent material which comprises contacting the granular substrate and the pulverulent material with an aqueous solution of at least one inorganic salt which forms a non-hygroscopic hydrated salt in the presence of the pulverulent material whereby the pulverulent material is attached to the hydrated salt crystallised on the surface of the granular substrate, and drying the resulting composite granules.
2. A process according to claim 1, wherein the inorganic salt is one or more alkali metal borates.
3. A process according to claim 2, wherein the alkali metal borate is disodium octaborate tetrahydrate.
4. A process according to any of claims 1 to 3, wherein the contacting is effected in the presence of a surface active agent.
5. A process according to any of claims 1 to 4, wherein the inorganic salt is used in a proportion of 1-20% by weight based on the weight of the granular substrate.
6. A process according to any of claims 1 to 5, wherein the granular substrate is limestone, calcite or marble.
7. A process according to any of claims 1 to 6, wherein the particle size of the granular substrate is within the range from 4,000 microns to 250 microns.
8. A process according to claim 7, wherein the particle size of the granular substrate is substantially 1000 microns.
9. A process according to any of claims 1 to 8, wherein the pulverulent material is a herbicide, fertiliser or pesticide.
10. A process for preparing composite granules substantially as herein described with reference to the specific Example.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8012924A GB2049429B (en) | 1979-04-23 | 1980-04-18 | Process for preparing composite granules |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7914110 | 1979-04-23 | ||
| GB8012924A GB2049429B (en) | 1979-04-23 | 1980-04-18 | Process for preparing composite granules |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2049429A true GB2049429A (en) | 1980-12-31 |
| GB2049429B GB2049429B (en) | 1983-01-12 |
Family
ID=26271307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8012924A Expired GB2049429B (en) | 1979-04-23 | 1980-04-18 | Process for preparing composite granules |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2049429B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0184663A1 (en) * | 1984-11-21 | 1986-06-18 | Bio-Kil Chemicals Limited | The production of shaped bodies of boron compounds |
-
1980
- 1980-04-18 GB GB8012924A patent/GB2049429B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0184663A1 (en) * | 1984-11-21 | 1986-06-18 | Bio-Kil Chemicals Limited | The production of shaped bodies of boron compounds |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2049429B (en) | 1983-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |