CN108189269A - The prilling process of melamine formaldehyde molding compound and moulding compound particle obtained - Google Patents
The prilling process of melamine formaldehyde molding compound and moulding compound particle obtained Download PDFInfo
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- CN108189269A CN108189269A CN201711469618.2A CN201711469618A CN108189269A CN 108189269 A CN108189269 A CN 108189269A CN 201711469618 A CN201711469618 A CN 201711469618A CN 108189269 A CN108189269 A CN 108189269A
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- melamine formaldehyde
- molding compound
- formaldehyde molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/08—Making granules by agglomerating smaller particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
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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
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08L61/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08L61/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The present invention relates to field of plastics processing, prilling process and moulding compound particle obtained, the prilling process of the melamine formaldehyde molding compound in particular to a kind of melamine formaldehyde molding compound include the following steps：To the powder spray binding agent of melamine formaldehyde molding compound, centrifugal granulating is carried out after moisture absorption, obtains wet grain；Whole grain, sub-sieve, combination cooling after wet grain is dried, obtain melamine formaldehyde molding compound particle.The prilling process of the melamine formaldehyde molding compound of the present invention by way of centrifuging wet granulation, forms the particle of 12 mesh to 60 mesh using centrifugal action, particle is securely non-breakable, it overcomes in the prior art, since the molecular weight of melamine formaldehyde molding compound is big, is granulated the problem of difficulty is big.
Description
Technical field
The present invention relates to field of plastics processing, in particular to a kind of prilling process of melamine formaldehyde molding compound
And moulding compound particle obtained.
Background technology
Amino film plastics mainly include urea-formaldehyde plastics and melamine plastic, and the base material that the two uses is respectively to urinate
Element, formaldehyde and melamine, formaldehyde contain there are two amino and three amino, therefore are referred to as amino film plastics respectively.Melamine
Amine formaldehyde moulding compound is that melamine is combined into melamine resin with formaldehyde addition and polycondensation, in addition filler, pigment, curing
No matter a kind of thermosetting plastics of the auxiliary materials such as agent, releasing agent synthesis, machining feature are required to using which kind of forming method
Processing mold, because of referred to herein as moulding compound.Melamine formaldehyde molding compound is more excellent in heat resistance, water resistance and electric property etc.
It is the upgrade version of urea moulding material development in urea moulding material.
However, the Nature comparison of melamine formaldehyde molding compound is active, after manufacture actually when temperature is higher molecular weight
Also slowly rising, therefore, it is necessary to store under cryogenic, the high activity of melamine formaldehyde molding compound is first to powdery mould
The stability of plastics proposes challenge.Along with the unstability of curing agent, to accelerate machine-shaping speed, it will usually which adding in will
The curing agent of distillation, in temperature higher summer, it is difficult to ensure that melamine formaldehyde molding compound did not lost flowing in three months
Property.Also, since the average molecular weight of melamine formaldehyde molding compound is more than urea moulding material, melamine formaldehyde molding compound
Difficulty is granulated to increase.
There are two types of techniques in the world for the granulation of melamine formaldehyde molding compound, the first technique is Panasonic Japan electrician
Cold-rolling process：Powder is extruded into piece by chilling roller pressure, then crushes granulating again, obtained melamine formaldehyde molding compound
Extra-granular is crude, and since above-mentioned cold-rolling process is that simple depended on pressure squeezes, particle is insecure, can be generated in transportational process broken.
Second of technique is rolling into sheets after Screw Extrusion, then crushes whole grain again and obtains full pelletized product, this technique is mainly intentional
Big Li Kai meter, Britain BIP etc., the pelletized product both sides that this technique obtains are flat, and surrounding is rounded or oval.But melamine
The average molecular weight of amine formaldehyde moulding compound is larger, and viscosity is larger, certain difficulty is caused to Screw Extrusion, and high temperature extrusion can influence
The performances such as the mobility of melamine formaldehyde molding compound.
In view of this, it is special to propose the present invention.
Invention content
The first object of the present invention is to provide a kind of prilling process of melamine formaldehyde molding compound, by centrifuging wet method
The mode of granulation forms 12 mesh to the circular granular of 60 mesh using centrifugal action, and particle is securely non-breakable, and can keep original
Melamine formaldehyde molding compound quality and processing performance, and the small particle of grain size can mutually be filled as filling in application
Between the relatively large particle of grain size, the comprehensive performance of plastics is improved；And the method can form productivity on a large scale.
The second object of the present invention is to provide a kind of of melamine formaldehyde molding compound made from prilling process
Grain, the particle surface is smooth, granularity between 12 mesh between 60 mesh, the performance of the particle of small particle and relatively large grain size
It is mutually reinforcing supplement so that the performance that the shelf life can guarantee material up to six months, it will not lost flowability etc..
In order to realize the above-mentioned purpose of the present invention, spy uses following technical scheme：
The prilling process of melamine formaldehyde molding compound, includes the following steps：
A) to the powder spray binding agent of melamine formaldehyde molding compound, centrifugal granulating is carried out, obtains wet grain；
B) by wet grain drying, whole grain, sub-sieve, combination cooling, melamine formaldehyde molding compound particle is obtained.
Preferably, powdery melamine formaldehyde molding compound is subjected to gas solid separation, collects solid phase powder.Collect solid phase powder
After carry out centrifugal granulating, gas solid separation can also avoid dust.
The prilling process of the melamine formaldehyde molding compound of the present invention, by way of centrifuging wet granulation, utilizes centrifugation
Effect forms the particle of 12 mesh to 60 mesh, and particle is securely non-breakable.In the prior art, due to melamine formaldehyde molding compound
Molecular weight is big, and granulation difficulty is big, and the present invention uses wet granulation under the premise of melamine formaldehyde molding compound stability is ensured
Manufacture obtains granular melamine formaldehyde molding compound.
Melamine formaldehyde molding compound is being far longer than urea moulding material by the viscosity after wet, and urea moulding material can be
Progress polycondensation, mixing, vacuum dehydration in Buss kneaders, for example unhulled paddy size of obtained drying particulate, and melamine
Amine formaldehyde moulding compound can not be manufactured in Buss kneaders, form agglomerate since viscosity is excessive, be filled again without chopping therebetween
It puts, mixing can be caused to fail.
Preferably, the centrifugal rotational speed of centrifugal granulating is 250-350rpm/min in the step a).
According to the centrifugal rotational speed of above-mentioned centrifugal granulating, the operating current of centrifugal granulator can ensured in 120A-
In the zone of reasonableness of 180A, and under the premise of not making a noise, make the particle size that centrifugal granulating obtains between 0.2-1.4mm；
Also, between the small particle of grain size mutually can be filled in the relatively large particle of grain size as filling in application, improve plastics
Comprehensive performance.
Preferably, the binding agent and the mass ratio of solid phase powder are 1 ﹕ (40-60).It is furthermore preferred that the binding agent with
The mass ratio of solid phase powder is 1 ﹕ 50.
Preferably, the binding agent includes Arabic gum, sodium carboxymethylcellulose, alkyl phenol polyoxyethylene ether and polyethylene
It is one or more in alcohol.Preferably, the binding agent is one kind in sodium carboxymethylcellulose and alkyl phenol polyoxyethylene ether
Or two kinds of mixing.Preferably, binder making is sprayed on to the surface of solid phase powder into aqueous solution.
Preferably, the molecular weight of the polyvinyl alcohol is no more than 1000.It is furthermore preferred that the molecular weight of the polyvinyl alcohol is
400-1000。
Arabic gum is a kind of safe and harmless thickener, is the natural gum that natural coagulation in air forms, and is molecular weight
It is odorless, tasteless, inflammable for the polyelectrolyte of 22-30 ten thousand, it can gradually dissolve in water and be in acid viscous liquid,
Solubility about 50%.
Sodium carboxymethylcellulose belongs to anionic cellulose ethers, and appearance is white or yellowish wadding fibrous sprills
Or white powder, it is odorless, tasteless, nontoxic, it is soluble easily in water, form the clear solution with certain viscosity.Solution is neutral or micro-
Alkalinity has hygroscopicity, and photo-thermal is stablized.Sodium carboxymethylcellulose can form highly viscous colloid, solution, there is adhesion, thickening, stream
The characteristics such as dynamic, emulsion dispersion, suspended.
Alkyl phenol polyoxyethylene ether is a kind of polyoxyethylene non-ionic surfactant, and property is stablized, acid and alkali-resistance and into
This is cheap.Alkyl phenol polyoxyethylene ether has the function of good wetting, infiltration, emulsification, dispersion, solubilising and washing.
Polyvinyl alcohol is soluble easily in water, insoluble in organic solvent, has higher viscosity after being dissolved in water, has adhesion, thickening
Etc. characteristics.
Preferably, a concentration of 3%-6% of the aqueous solution of the binding agent.
Preferably, the binding agent is alkyl phenol polyoxyethylene ether.It is furthermore preferred that the quality of the aqueous solution of the binding agent
A concentration of 3%-4%.It is further preferred that the mass concentration of the aqueous solution of the binding agent is 3%.
According to the concentration of above-mentioned binding agent, the viscosity of the aqueous solution of binding agent is suitable, the particle for obtaining centrifugal granulating
Size improves the comprehensive performance of plastics between 0.2-1.4mm.
Preferably, wet grain is dried by way of tablet drying in the step b).It is furthermore preferred that the tablet drying
Walking speed for 20-60cm/min, the hot blast temperature of the tablet drying is 70-80 DEG C.
Wet grain is delivered to pendulum distributing device by auger by granulation motor spindle, is then homogeneously added into tablet drier
In loading hopper, tablet drier advances according to above-mentioned walking speed, and hot wind is reached the temperature of above-mentioned setting by steam heating air, by wet
The top of grain, which is blown into, to be dried, and is finally cooled down, and completes the drying of particle, and above-mentioned drying temperature is ensureing dry base
On plinth, particle will not be impacted.Production capacity can reach 1000-1500kg/h.
Preferably, sub-sieve collects the particle combination cooling that size is 10 mesh to 80 mesh after whole grain in the step b), obtains
Melamine formaldehyde molding compound particle.It is furthermore preferred that collecting the particle combination cooling of 12-60 mesh, melamino-formaldehyde mould is obtained
Plastic grain.
Preferably, sub-sieve after whole grain in the step b), size is more than the particles of 10 mesh, and whole grain, size are less than 80 mesh again
Particle centrifugal granulating again.It is furthermore preferred that size is more than the particle whole grain again of 12 mesh, size is less than the particle of 60 mesh again
Centrifugal granulating.
The present invention also provides melamino-formaldehydes made from a kind of prilling process of the melamine formaldehyde molding compound
Moulding compound particle.
Preferably, the granularity of the moulding compound particle is 12 mesh to 60 mesh.
The particle of the melamine formaldehyde molding compound of the present invention, surface is smooth, granularity between 12 mesh between 60 mesh, granule
The performance of the particle of diameter and relatively large grain size is mutually reinforcing supplement, improves the comprehensive performance of melamine formaldehyde molding compound.
The full granular materials that the prilling process obtains, suitable for being used for two kinds of form processings of compression forming and injection moulding both at home and abroad,
Product surface orange peel is clearly fine and smooth, and glossiness is high, and all parameters reach GB/T13454.3-2013 powdery melamine first
The Part III of aldehyde moulding compound selectes the requirement in moulding compound.Also, compared to powdery melamine formaldehyde molding compound, the present invention
The particle storge quality and processing performance for the melamine formaldehyde molding compound being prepared are stablized, and non-breakable, the shelf life can
The performance that can ensure material up to six months, will not lost flowability etc..
Compared with prior art, beneficial effects of the present invention are：
(1) prilling process of melamine formaldehyde molding compound of the invention, one is provided for melamine formaldehyde molding compound
The new prilling process of kind by way of centrifuging wet granulation, forms the particle of 12 mesh to 60 mesh, and particle using centrifugal action
It is securely non-breakable；
(2) present invention obtains graininess under the premise of melamine formaldehyde molding compound stability is ensured with wet granulation
Melamine formaldehyde molding compound, overcome in the prior art since the molecular weight of melamine formaldehyde molding compound is big, be granulated difficulty
The problem of big；
(3) present invention is by the restriction of the condition of centrifugal granulating and the type of binding agent and concentration, obtain granularity between
Melamine moulding compound particle between 0.2-1.4mm, and meet in standard to the various requirement of moulding compound；
(4) particle of melamine formaldehyde molding compound of the invention, surface is smooth, suitable for being used for compression forming both at home and abroad
With two kinds of form processings of injection moulding, product surface orange peel is clearly fine and smooth, and glossiness is high, and all parameters reach GB/
The Part III of T13454.3-2013 powdery melamine formaldehyde molding compounds selectes the requirement in moulding compound；
(5) compared to powdery melamine formaldehyde molding compound, melamine formaldehyde molding compound that the present invention is prepared
Particle storge quality and processing performance are stablized, and non-breakable, the performance that the shelf life can ensure material up to six months will not lose
Lose mobility etc..
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described.
Fig. 1 is the flow diagram of the prilling process of the melamine formaldehyde molding compound of the present invention；
Fig. 2 is the structure diagram of the cyclone dust removal all-in-one machine of the embodiment of the present invention.
Reference numeral：
1- housings；2- cloth bags；3- cloth pkt. flaps；
4- substrate support seats；5- measures electronic component；6- mixing paddle axles；
7- agitating paddles；11- granular material imports；12- powders export；
21- gaseous phase outlets.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person, the condition suggested according to normal condition or manufacturer carry out.Reagents or instruments used without specified manufacturer is
The conventional products that can be obtained by commercially available purchase.
In the description of the present invention, it should be noted that term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instructions such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Convenient for the description present invention and simplify description rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is only used for description purpose, and it is not intended that instruction or hint relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Referring to Fig. 1, it is the flow diagram of the prilling process of the melamine formaldehyde molding compound of the present invention, the present invention
The prilling process of melamine formaldehyde molding compound described in embodiment, includes the following steps：
A) powdery melamine formaldehyde molding compound is subjected to gas solid separation, collects solid phase powder；It sprays and bonds to solid phase powder
Agent carries out centrifugal granulating after solid phase powder moisture absorption, obtains wet grain；
B) by wet grain drying, whole grain, sub-sieve, combination cooling, melamine formaldehyde molding compound particle is obtained.
Specifically, powdery melamine formaldehyde molding compound is subjected to gas solid separation by cyclone dust removal all-in-one machine.It please refers to
Fig. 2 is the structure diagram of the cyclone dust removal all-in-one machine described in the embodiment of the present invention.The cyclone dust removal all-in-one machine includes shell
Body 1, cloth bag 2, cloth pkt. flap 3, substrate support seat 4, metering electronic component 5, mixing paddle axle 6, agitating paddle 7.The cloth bag 2 is used as cloth
Bag dedusting area is set to 1 top of housing, and cloth pkt. flap 3 is covered on 2 top of cloth bag, dust is avoided to escape.1 side of the housing setting
There is granular material import 11, bottom is provided with powder outlet 12, and 2 side top of cloth bag is provided with gaseous phase outlet 21.Powdery
Melamine formaldehyde molding compound enters cyclone dust removal all-in-one machine by granular material import 11, and gas phase fine powder enters cloth through all-in-one machine
Bag 2, then detached by cloth bag 2, fine powder drops back into housing 1 through cloth bag 2, and gas phase is discharged by gaseous phase outlet 21.It falls into housing 1
Powder by being set to 5 sense weight of metering electronic component of the lower section of substrate support seat 4, to after preset weight, stop from powdery
Material inlet 11 is fed, and opens powder outlet 12, and powder is made to fall into comminutor and is granulated.
After entering comminutor by the solid phase powder of preset weight, granulation cover is covered, gradually the solid phase powder into comminutor
The aqueous solution of the advance prepared binding agent of body spray, gradually starts conglomeration after the solid phase powder moisture absorption in comminutor, opens at this time
Open the cutter blank of comminutor, powder is constantly cut small, and the constantly upper new powder of cladding, and constantly cut it is small, due to being granulated
The centrifugal force of machine makes little particle form solid wet grain not of uniform size, and grain densityization homogenizes.The batch of comminutor is
200kg-300kg is, it can be achieved that mass production.
Wet grain by granulation motor spindle is discharged, can pendulum distributing device be delivered to by auger, it will by pendulum distributing device
Wet grain is homogeneously added into the loading hopper of tablet drier, and tablet drier advances according to the walking speed of 20-60cm/min, and hot wind is
Reach 70-80 DEG C by steam heating air, wet feed is dried by blowing to wet feed at the top of tablet drier, makes its water content
It is 3.7 ± 0.2%, is cooled down after drying, completes the drying to wet grain.The life of the tablet drier of the embodiment of the present invention
Production capacity power can reach 1000-1500kg/h.
It is added in pelletizing machine after wet grain is dried and carries out whole grain, the operating current of the pelletizing machine is 18A-32A, by particle
The crude profile in surface wears into smooth round shape particle not of uniform size, and particle size can be reduced further after whole grain.
Particle after whole grain is three parts through vibrosieve, small part coarse grain, and the particle as particle size is more than 12 mesh is sent into pelletizing machine
In carry out sub-sieve again after whole grain again；Small part fine powder, the particle as particle size is less than 60 mesh pass through cyclone dust removal all-in-one machine
Into comminutor again centrifugal granulating；And most particle, particle size enter mixer for the particle of 12 mesh to 60 mesh and mix
Conjunction is handled.The particle of particle size not of uniform size for 12 mesh to 60 mesh is sent into mixer, is sufficiently mixed on one side, on one side will
The heat that mixed film friction generates leads to cooling water by the chuck of mixer and moves away, after mixing discharging packaging.Packaging can adopt
With packing automatically, the particle of the melamine formaldehyde molding compound obtained through the prilling is inhaled by mixer lower end outlet vacuum
Go out, be packed into bag after being counted weight into 25kg/ bags by automatic packaging machine, manipulator is focused on by conveyer belt after sealing and is in supporting plate
Upper code piles frame, can one ton of one frame, then by fork truck transport to warehouse formulate place.
Wherein, further experiment has been carried out to the rotating speed of the centrifugation of the type of binding agent and concentration, comminutor.The bonding
Agent is one or more in Arabic gum, sodium carboxymethylcellulose, alkyl phenol polyoxyethylene ether and polyvinyl alcohol.The bonding
The mass ratio of agent and solid phase powder is 1 ﹕ (40-60), preferably 1 ﹕ 50.
First, by Arabic gum, sodium carboxymethylcellulose, Polyethylene Octylphenol Ether and polyvinyl alcohol (PVA-800)
Mass concentration is respectively configured to as 9%, 8% and the aqueous solution of 7% 3 kind of concentration, (is not included in aqueous solution according to binding agent
Water amount) with the mass ratio of solid phase powder be 1 ﹕ 50, made under conditions of the centrifugal rotational speed of identical 250rpm/min
Grain compares particle maximum particle diameter and minimum grain size after being granulated, obtains the test result of table 1.
Influence of the aqueous solution of the different binding agents of 1 various concentration of table to grain size
By in upper table 1 it is found that the viscosity of Arabic gum and polyvinyl alcohol is relatively higher, as binding agent in melamine first
Not as good as trimerization that sodium carboxymethylcellulose and alkyl phenol polyoxyethylene ether are obtained as binding agent in the prilling of aldehyde moulding compound
The particle size of cyanamide formaldehyde molding compound is good.Due to mass concentration be 9%, 8% and 7% sodium carboxymethyl cellulose solution and
Alkyl phenol polyoxyethylene ether aqueous solution, the particle produced by the prilling process is bigger than normal, right to obtain grain size more preferably particle
The concentration of sodium carboxymethylcellulose and the aqueous solution of alkyl phenol polyoxyethylene ether is further improved, respectively 6%, 5%, 4% and
3%, it is granulated under conditions of the centrifugal rotational speed of identical 250rpm/min, compares the particle maximum particle diameter and most after being granulated
Small particle obtains the test result of table 2.
Influence of the aqueous solution of the different binding agents of 2 various concentration of table to grain size
By in upper table it is found that alkyl phenol polyoxyethylene ether is as binding agent, when the mass concentration of aqueous solution is 3%,
Particle size has excellent comprehensive performance between 0.3-1.2mm.And when concentration further reduces, since binding agent is dense
Spend low, granulating ratio is low during granulation, can not meet production requirement.
Thus, by above-mentioned experiment, binding agent is optimal with alkyl phenol polyoxyethylene ether, and the mass concentration of aqueous solution is
It is optimal when 3%.
The embodiment of the present invention tests the rotating speed of the centrifugation of comminutor.Theoretically, rotating speed is higher, and grain size is smaller,
Density is relatively high, but the operating current of motor will also improve or even increase power of motor and could realize simultaneously, while revolves at a high speed
Turn also generate noise.According to the type of above-mentioned binding agent and the condition of concentration, binding agent uses alkyl phenol polyoxyethylene ether,
When the mass concentration of its aqueous solution is 3%, the centrifugal rotational speed of comminutor is tested, so that item of the comminutor in rational operating current
Under part, and under the premise of not making a noise, the particle size that centrifugal granulating obtains is made to meet condition.By the centrifugal rotational speed of comminutor
It is set as tetra- rotating speeds of 200rpm/min, 250rpm/min, 300rpm/min and 350rpm/min to be tested, test result is shown in
The following table 3.
Influence of the different centrifugal rotational speed of 3 comminutor of table to particle size
| Rotating speed (rpm/min) | Maximum particle diameter (mm) | Minimum grain size (mm) | Peak load (A) |
| 200 | 1.6 | 0.5 | 105 |
| 250 | 1.4 | 0.4 | 120 |
| 300 | 1.2 | 0.3 | 150 |
| 350 | 1.1 | 0.2 | 180 |
It is learnt by table 3, the centrifugal rotational speed of 200rpm/min is too low, and granulation grain size is bigger than normal, and 250-350rpm/min's
The particle size that rotating speed is granulated can be met the requirements, and comminutor can work, and do not send out and make an uproar under rational electric current
Sound.
Relative to the prior art, the prilling process of melamine formaldehyde molding compound of the invention, by centrifuging wet granulation
Mode, using centrifugal action formed 12 mesh to the particle of 60 mesh, particle is securely non-breakable, and can keep original melamine
The quality and processing performance of amine formaldehyde moulding compound, and the small particle of grain size mutually can be filled in grain size phase as filling in application
Between larger particle, the comprehensive performance of plastics is improved；And the method can form productivity on a large scale.
The particle of the melamine formaldehyde molding compound of the present invention, surface is smooth, granularity between 12 mesh between 60 mesh, granule
The performance of the particle of diameter and relatively large grain size is mutually reinforcing supplement, improves the comprehensive performance of melamine formaldehyde molding compound.
The full granular materials that the prilling process obtains, suitable for being used for two kinds of form processings of compression forming and injection moulding both at home and abroad,
Product surface orange peel is clearly fine and smooth, and glossiness is high, and all parameters reach GB/T13454.3-2013 powdery melamine first
The Part III of aldehyde moulding compound selectes the requirement in moulding compound.Also, compared to powdery melamine formaldehyde molding compound, the present invention
The particle storge quality and processing performance for the melamine formaldehyde molding compound being prepared are stablized, and non-breakable, the shelf life can
The performance that can ensure material up to six months, will not lost flowability etc..
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
1. the prilling process of melamine formaldehyde molding compound, which is characterized in that include the following steps：
A) to the powder spray binding agent of melamine formaldehyde molding compound, centrifugal granulating is carried out, obtains wet grain；
B) by wet grain drying, whole grain, sub-sieve, combination cooling, melamine formaldehyde molding compound particle is obtained.
2. the prilling process of melamine formaldehyde molding compound according to claim 1, which is characterized in that in the step a)
The centrifugal rotational speed of centrifugal granulating is 250-350rpm/min.
3. the prilling process of melamine formaldehyde molding compound according to claim 1, which is characterized in that the binding agent with
The mass ratio of solid phase powder is 1 ﹕ (40-60).
4. according to the prilling process of claim 1-3 any one of them melamine formaldehyde molding compounds, which is characterized in that described
Binding agent includes one or more in Arabic gum, sodium carboxymethylcellulose, alkyl phenol polyoxyethylene ether and polyvinyl alcohol；
Preferably, the binding agent is the mixing of one or both of sodium carboxymethylcellulose and alkyl phenol polyoxyethylene ether；
Preferably, binder making is sprayed on to the surface of solid phase powder into aqueous solution.
5. the prilling process of melamine formaldehyde molding compound according to claim 4, which is characterized in that the binding agent
The mass concentration of aqueous solution is 3%-6%.
6. the prilling process of melamine formaldehyde molding compound according to claim 1, which is characterized in that the binding agent is
Alkyl phenol polyoxyethylene ether；
Preferably, the mass concentration of the aqueous solution of the binding agent is 3%-4%.
7. the prilling process of melamine formaldehyde molding compound according to claim 1, which is characterized in that in the step b)
Wet grain is dried by way of tablet drying；
Preferably, the walking speed of the tablet drying is 20-60cm/min, and the hot blast temperature of the tablet drying is 70-80 DEG C.
8. the prilling process of melamine formaldehyde molding compound according to claim 1, which is characterized in that in the step b)
Sub-sieve collects the particle combination cooling that size is 10 mesh to 80 mesh after whole grain, obtains melamine formaldehyde molding compound particle；
Preferably, the particle combination cooling of 12-60 mesh is collected, obtains melamine formaldehyde molding compound particle.
9. the prilling process of melamine formaldehyde molding compound according to claim 1, which is characterized in that in the step b)
Sub-sieve after whole grain, size are more than the particle whole grain again of 10 mesh, and size is less than the particles of 80 mesh centrifugal granulating again；
Preferably, size is more than the particle whole grain again of 12 mesh, and size is less than the particles of 60 mesh centrifugal granulating again.
10. melamino-formaldehyde made from the prilling process of claim 1-9 any one of them melamine formaldehyde molding compounds
Moulding compound particle.
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| CN201711469618.2A CN108189269A (en) | 2017-12-29 | 2017-12-29 | The prilling process of melamine formaldehyde molding compound and moulding compound particle obtained |
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| CN201711469618.2A CN108189269A (en) | 2017-12-29 | 2017-12-29 | The prilling process of melamine formaldehyde molding compound and moulding compound particle obtained |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110164287A (en) * | 2019-06-13 | 2019-08-23 | 苏州育龙科教设备有限公司 | A kind of emulation sandstone resin particle for teaching |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157846A (en) * | 2007-09-20 | 2008-04-09 | 北京联合大学 | Centrifugal granulating method for producing sealing material and product and uses thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157846A (en) * | 2007-09-20 | 2008-04-09 | 北京联合大学 | Centrifugal granulating method for producing sealing material and product and uses thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110164287A (en) * | 2019-06-13 | 2019-08-23 | 苏州育龙科教设备有限公司 | A kind of emulation sandstone resin particle for teaching |
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