CN112574647A - Novel heat-dissipating powder coating and preparation process thereof - Google Patents
Novel heat-dissipating powder coating and preparation process thereof Download PDFInfo
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- CN112574647A CN112574647A CN202011432303.2A CN202011432303A CN112574647A CN 112574647 A CN112574647 A CN 112574647A CN 202011432303 A CN202011432303 A CN 202011432303A CN 112574647 A CN112574647 A CN 112574647A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/10—Epoxy resins modified by unsaturated compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D123/04—Homopolymers or copolymers of ethene
- C09D123/08—Copolymers of ethene
- C09D123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C09D123/0853—Vinylacetate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/26—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment
- C09D123/28—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
- C09D123/286—Chlorinated polyethylene
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/04—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C09D127/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
- C09D5/038—Anticorrosion agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2275—Ferroso-ferric oxide (Fe3O4)
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a novel heat-dissipating powder coating, which comprises 10-17 parts of vinyl ester; 21-26 parts of weather-resistant resin; 15-25 parts of composite iron-titanium powder; 3-6 parts of graphene; 9-12 parts of a curing agent; 10-16 parts of a filler; 4-8 parts of pigment, the novel heat-dissipating powder coating improves the heat-dissipating function of the powder coating and the spraying effect on metal, the anticorrosion and antirust mechanism of the composite ferrotitanium powder lies in the inherent performance of the nano material, the active points of the nano material are increased, the surface bonding energy is also increased rapidly, the chemical activity is very high, the composite ferrotitanium powder can be combined with other media easily and stabilized, meanwhile, the shielding degree of the coating is increased due to the introduction of the nano material, and when the composite ferrotitanium powder is constructed on the surface of steel, the composite ferrotitanium powder has certain affinity with the steel.
Description
Technical Field
The invention relates to the field of related products of powder coatings, in particular to a novel heat-dissipating powder coating and a preparation process thereof.
Background
The heat dissipation anticorrosive paint is one of important branches of the paint, and is certainly widely applied in future industrial production. Due to the rapid development of modern scientific technology of materials and metals at present, the design and production of instruments, equipment and parts are developed towards miniaturization, lightweight, compactness and high efficiency, and the development of ultra-large scale integrated circuits makes the high power density characteristic of electronic devices more and more obvious, so that a large amount of generated heat directly influences the working stability and complete reliability of the electronic devices.
However, the existing powder coating has the defects that the combination of the coating and the metal texture is not as clear as that of paint, and the powder coating has poor heat dissipation performance and has defects.
Disclosure of Invention
The invention aims to provide a novel heat-dissipating powder coating and a preparation process thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a novel heat-dissipating powder coating comprises 10-17 parts of vinyl ester; 21-26 parts of weather-resistant resin; 15-25 parts of composite iron-titanium powder; 3-6 parts of graphene; 9-12 parts of a curing agent; 10-16 parts of a filler; 4-8 parts of pigment.
Preferably, the vinyl ester is one of a flame retardant epoxy vinyl ester resin or a flexible vinyl ester resin.
Preferably, the weather-resistant resin is formed by combining polyvinyl chloride resin, EVA resin, chlorinated polyethylene and polydimethylsiloxane.
Preferably, the composite ferrotitanium powder is prepared by taking ferroferric oxide as a carrier and adding nano-scale titanium dioxide and calcium carbonate filler.
Preferably, the curing agent is dodecanedioic acid.
Preferably, the pigment is a brightener.
A preparation process of a novel heat-dissipating powder coating comprises the following steps:
step 1, weighing vinyl ester, weather-resistant resin, graphene, a curing agent, a filler and a pigment in parts by weight, putting the vinyl ester, the weather-resistant resin, the graphene, the curing agent, the filler and the pigment into a vertical mixing tank device, and stirring to fully and uniformly mix the raw materials;
step 2, adding the composite ferrotitanium powder, and stirring and scattering;
step 3, putting the raw materials into a double-screw mixing extruder, and performing melt extrusion;
step 4, cooling, crushing and tabletting the melted and extruded raw materials;
and 5, grinding the tabletted coating into powder, sieving the powder by a 250-mesh sieve, and discharging.
Preferably, the stirring and scattering time in the step 2 is 4 min.
Preferably, the melting in step 3 is performed at 150 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the novel heat-dissipating powder coating improves the heat-dissipating function of the powder coating and the spraying effect on metal, the anticorrosion and antirust mechanism of the composite ferrotitanium powder lies in the inherent performance of the nano material, the active points of the nano material are increased, the surface bonding energy is also increased rapidly, the chemical activity is high, the composite ferrotitanium powder can be easily combined with other media to be stabilized, meanwhile, the shielding degree of the coating is increased due to the introduction of the nano material, when the composite ferrotitanium powder is constructed on the surface of steel, the adhesion of the coating is improved due to the fact that the ferrotitanium powder has certain affinity with the steel, the corrosion resistance is also improved, the formula is simple, the operation is convenient, and the composite ferrotitanium powder is beneficial to production, so that the production efficiency is improved, the production cost is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The embodiment provided by the invention comprises the following steps:
example 1
A novel heat-dissipating powder coating comprises 10 parts of vinyl ester; 21 parts of weather-resistant resin; 15 parts of composite ferrotitanium powder; 3 parts of graphene; 9 parts of a curing agent; 10 parts of a filler; 4 parts of pigment.
Further, the vinyl ester is one of flame retardant epoxy vinyl ester resin or flexible vinyl ester resin.
Furthermore, the weather-resistant resin is formed by combining polyvinyl chloride resin, EVA resin, chlorinated polyethylene and polydimethylsiloxane.
Further, the composite ferrotitanium powder is compounded by taking ferroferric oxide as a carrier and adding nano-scale titanium dioxide and calcium carbonate filler.
Further, the curing agent is dodecanedioic acid.
Further, the pigment is a brightener.
A preparation process of a novel heat-dissipating powder coating comprises the following steps:
step 1, weighing vinyl ester, weather-resistant resin, graphene, a curing agent, a filler and a pigment in parts by weight, putting the vinyl ester, the weather-resistant resin, the graphene, the curing agent, the filler and the pigment into a vertical mixing tank device, and stirring to fully and uniformly mix the raw materials;
step 2, adding the composite ferrotitanium powder, and stirring and scattering;
step 3, putting the raw materials into a double-screw mixing extruder, and performing melt extrusion;
step 4, cooling, crushing and tabletting the melted and extruded raw materials;
and 5, grinding the tabletted coating into powder, sieving the powder by a 250-mesh sieve, and discharging.
Further, the stirring and scattering time in the step 2 is 4 min.
Further, the melting in step 3 is carried out at 150 ℃.
Example 2
A novel heat-dissipating powder coating comprises 17 parts of vinyl ester; 26 parts of weather-resistant resin; 25 parts of composite ferrotitanium powder; 6 parts of graphene; 12 parts of a curing agent; 16 parts of a filler; and 8 parts of pigment.
Further, the vinyl ester is one of flame retardant epoxy vinyl ester resin or flexible vinyl ester resin.
Furthermore, the weather-resistant resin is formed by combining polyvinyl chloride resin, EVA resin, chlorinated polyethylene and polydimethylsiloxane.
Further, the composite ferrotitanium powder is compounded by taking ferroferric oxide as a carrier and adding nano-scale titanium dioxide and calcium carbonate filler.
Further, the curing agent is dodecanedioic acid.
Further, the pigment is a brightener.
A preparation process of a novel heat-dissipating powder coating comprises the following steps:
step 1, weighing vinyl ester, weather-resistant resin, graphene, a curing agent, a filler and a pigment in parts by weight, putting the vinyl ester, the weather-resistant resin, the graphene, the curing agent, the filler and the pigment into a vertical mixing tank device, and stirring to fully and uniformly mix the raw materials;
step 2, adding the composite ferrotitanium powder, and stirring and scattering;
step 3, putting the raw materials into a double-screw mixing extruder, and performing melt extrusion;
step 4, cooling, crushing and tabletting the melted and extruded raw materials;
and 5, grinding the tabletted coating into powder, sieving the powder by a 250-mesh sieve, and discharging.
Further, the stirring and scattering time in the step 2 is 4 min.
Further, the melting in step 3 is carried out at 150 ℃.
Example 3
A novel heat-dissipating powder coating comprises 14 parts of vinyl ester; 24 parts of weather-resistant resin; 16 parts of composite iron-titanium powder; 5 parts of graphene; 11 parts of a curing agent; 14 parts of a filler; 6 parts of pigment.
Further, the vinyl ester is one of flame retardant epoxy vinyl ester resin or flexible vinyl ester resin.
Furthermore, the weather-resistant resin is formed by combining polyvinyl chloride resin, EVA resin, chlorinated polyethylene and polydimethylsiloxane.
Further, the composite ferrotitanium powder is compounded by taking ferroferric oxide as a carrier and adding nano-scale titanium dioxide and calcium carbonate filler.
Further, the curing agent is dodecanedioic acid.
Further, the pigment is a brightener.
A preparation process of a novel heat-dissipating powder coating comprises the following steps:
step 1, weighing vinyl ester, weather-resistant resin, graphene, a curing agent, a filler and a pigment in parts by weight, putting the vinyl ester, the weather-resistant resin, the graphene, the curing agent, the filler and the pigment into a vertical mixing tank device, and stirring to fully and uniformly mix the raw materials;
step 2, adding the composite ferrotitanium powder, and stirring and scattering;
step 3, putting the raw materials into a double-screw mixing extruder, and performing melt extrusion;
step 4, cooling, crushing and tabletting the melted and extruded raw materials;
and 5, grinding the tabletted coating into powder, sieving the powder by a 250-mesh sieve, and discharging.
Further, the stirring and scattering time in the step 2 is 4 min.
Further, the melting in step 3 is carried out at 150 ℃.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. A novel heat-dissipating powder coating comprises 10-17 parts of vinyl ester; 21-26 parts of weather-resistant resin; 15-25 parts of composite iron-titanium powder; 3-6 parts of graphene; 9-12 parts of a curing agent; 10-16 parts of a filler; 4-8 parts of pigment.
2. The novel heat-dissipating powder coating as claimed in claim 1, wherein: the vinyl ester is one of flame-retardant epoxy vinyl ester resin or flexible vinyl ester resin.
3. The novel heat-dissipating powder coating as claimed in claim 1, wherein: the weather-resistant resin is formed by combining polyvinyl chloride resin, EVA resin, chlorinated polyethylene and polydimethylsiloxane.
4. The novel heat-dissipating powder coating as claimed in claim 1, wherein: the composite ferrotitanium powder is compounded by taking ferroferric oxide as a carrier and adding nano-scale titanium dioxide and calcium carbonate filler.
5. The novel heat-dissipating powder coating as claimed in claim 1, wherein: the curing agent is dodecanedioic acid.
6. The novel heat-dissipating powder coating as claimed in claim 1, wherein: the pigment is a brightening agent.
7. A preparation process of a novel heat-dissipating powder coating is characterized by comprising the following steps: the method comprises the following steps:
step 1, weighing vinyl ester, weather-resistant resin, graphene, a curing agent, a filler and a pigment in parts by weight, putting the vinyl ester, the weather-resistant resin, the graphene, the curing agent, the filler and the pigment into a vertical mixing tank device, and stirring to fully and uniformly mix the raw materials;
step 2, adding the composite ferrotitanium powder, and stirring and scattering;
step 3, putting the raw materials into a double-screw mixing extruder, and performing melt extrusion;
step 4, cooling, crushing and tabletting the melted and extruded raw materials;
and 5, grinding the tabletted coating into powder, sieving the powder by a 250-mesh sieve, and discharging.
8. A preparation process of a novel heat-dissipating powder coating is characterized by comprising the following steps: the stirring and scattering time in the step 2 is 4 min.
9. A preparation process of a novel heat-dissipating powder coating is characterized by comprising the following steps: the melting in step 3 is carried out at 150 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011432303.2A CN112574647A (en) | 2020-12-10 | 2020-12-10 | Novel heat-dissipating powder coating and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011432303.2A CN112574647A (en) | 2020-12-10 | 2020-12-10 | Novel heat-dissipating powder coating and preparation process thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107474698A (en) * | 2017-09-19 | 2017-12-15 | 江南载福粉末涂料（张家港）有限公司 | Anticorrosion heat-dissipation powder paint and preparation method thereof |
| CN108948558A (en) * | 2017-05-17 | 2018-12-07 | 无锡市银杏塑业科技有限公司 | A kind of weather-proof resin |
| CN109627928A (en) * | 2018-12-24 | 2019-04-16 | 张至柔 | A kind of powdery paints and its preparation process |
-
2020
- 2020-12-10 CN CN202011432303.2A patent/CN112574647A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108948558A (en) * | 2017-05-17 | 2018-12-07 | 无锡市银杏塑业科技有限公司 | A kind of weather-proof resin |
| CN107474698A (en) * | 2017-09-19 | 2017-12-15 | 江南载福粉末涂料（张家港）有限公司 | Anticorrosion heat-dissipation powder paint and preparation method thereof |
| CN109627928A (en) * | 2018-12-24 | 2019-04-16 | 张至柔 | A kind of powdery paints and its preparation process |
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