CN108247990A - A kind of coating on inner surface bucket and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of coating on inner surface bucket bucket body internal surfaces to be coated with thermoplastic resin, the coating thickness is 0.001 10mm, by will heating thermoplastic material to melt after, gas is blown into it to be expanded it and extends to be melted completely in bucket body internal surface, make thermoplastic material and the bucket body internal surface strong binding, the heating temperature of thermoplastic material is more than or equal to glass transition temperature, it can be more convenient, more effectively solving the problems, such as the bucket inner surface of manufacture has bubble or stomata.

Description

A kind of coating on inner surface bucket and preparation method thereof

Technical field

The present invention relates to technical field of surface coating, it particularly relates to a kind of coating on inner surface bucket and preparation method thereof.

Background technology

Fill food, beverage, industrial chemicals, monomer, surfactant, coating, edible oil, mineral oil, resin, highly acid The as with a girdle of iron method using resin coating metal bucket inner surface of the various materials such as substance, strong alkaline substance, to prevent long-term Pollutant is moved to from metal bucket container on material during storage or metal bucket is corroded by material.

For example, polyethylene coated method is usually by ladle body, bottom plate or top plate circle circle and is processed into tubular（Cupuliform）Afterwards, holding The inner surface electrostatic spraying polyethylene powder coating of device, and melted in heating furnace.Also a kind of method is to apply polyethylene powders Advance electrostatic applications are expected in ladle body, bottom plate or top plate, melting is heated in heating furnace, and the polyethylene being consequently formed is applied into membrane material Material volume is honored as a queen, and is heated and is melted so as to partially fused with seaming again.In addition, still an alternative is that, use advance layer The steel plate of polyethylene film is pressed with, be heated and is melted, to be formed and seaming is into after ladle body, bottom plate or top plate, with volume It seals partially fused.

But, in the above prior art, although polyethylene powders or laminated film are implemented heat fusing processing so as to Seaming part is in close contact, but in this hot melt engagement, bubble may be generated between the slight void of seaming part.This A little bubbles be the polyethylene powder coating on seaming part is applied to particle between existing minimum gas or when by molten Close laminated film covering seaming portion timesharing, the air infiltrated between laminated film and the inner surface of metal bucket.In addition, when such gas is broken When splitting, the stomata opened to outside can be formed.There are the machineries that bubble or stomata can cause film in the inner surface coating of metal bucket The reduction of intensity or barrier property, therefore it is desirable that the generation of bubble and stomata can be inhibited.

Solution to the problems described above is disclosed in existing patent, is exactly in the toner coating progress to electrostatic coating It is hot-melted after process, by making a return journey bubble removing to carrying out trepanning there are the part of gas in resin coating film.However, it to remove completely The fine gas entered in resin is gone to be not easy to, and we also worry to remove bubble and trepanning may make film Barrier property reduces.It would therefore be desirable to by a kind of more easily method, it is made without the inner surface coating iron of bubble or stomata Bucket.

For the problems in the relevant technologies, currently no effective solution has been proposed.

Invention content

For the above-mentioned technical problem in the relevant technologies, the present invention proposes a kind of coating on inner surface bucket and preparation method thereof, It can solve above-mentioned technical problem.

To realize the above-mentioned technical purpose, the technical proposal of the invention is realized in this way：

A kind of coating on inner surface bucket, including bucket ontology, the bucket body internal surface is coated with thermoplastic resin, the coating thickness For 0.001-10mm.

Further, the thermoplastic resin selects one kind in polyethylene, polypropylene, polyester, polyamide, fluoride resin It is or several.

Further, the bucket ontology uses metal material.

Further, added with antioxidant, stabilizer, fire retardant, pigment, inorganic fill in the thermoplastic resin One or more of agent, softening agent.

Further, the thermoplastic resin and the adhesive strength of the bucket body internal surface are not less than 0.1kg/25mm.

Further, the coating thickness is 0.005-5mm.

A kind of preparation method of coating on inner surface bucket, by heating thermoplastic material to after melting, into it being blown into gas makes It expands and extends to and is melted completely in bucket body internal surface, makes thermoplastic material and the bucket body internal surface strong binding.

Further, the gas selects one kind in air, oxygen, nitrogen, argon gas.

Further, thermoplastic material is with using reduced pressure treatment while the bucket body internal surface strong binding.

Further, the heating temperature of thermoplastic material is more than or equal to glass transition temperature.

Beneficial effects of the present invention：By the way that by heating thermoplastic material, to after melting, gas is blown into it makes its expansion And extend to and melted completely in bucket body internal surface, make thermoplastic material and the bucket body internal surface strong binding, Neng Gougeng Convenient, more effectively solving the problems, such as the bucket inner surface of manufacture has bubble or stomata.

Description of the drawings

It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.

Fig. 1 is the processing unit (plant) figure for preparing coating on inner surface bucket described according to embodiments of the present invention 1.

Fig. 2 is the processing unit (plant) figure for preparing coating on inner surface bucket described according to embodiments of the present invention 2.

Fig. 3 is the processing unit (plant) figure for preparing coating on inner surface bucket described according to embodiments of the present invention 3.

Fig. 4 is the processing unit (plant) figure for preparing coating on inner surface bucket described according to embodiments of the present invention 5.

Fig. 5 is the processing unit (plant) figure for preparing coating on inner surface bucket described according to embodiments of the present invention 6.

In figure：1. barrel ontology；2. melting tank；3a. ring pipes；3b. nozzle leading portions portion；4. blowing plant；It is 5. movable Portion；6. Expansion bar；7. rubber packing department；8. pressure-reduction outlet；10. Viton air bag of 9.PTFE pieces

Specific embodiment

Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art's all other embodiments obtained belong to what the present invention protected Range.

A kind of coating on inner surface bucket according to embodiments of the present invention, including bucket ontology, the bucket body internal surface applies Thermoplastic resin is furnished with, the coating thickness is 0.001-10mm.

The thermoplastic resin selects one or more of polyethylene, polypropylene, polyester, polyamide, fluoride resin.

The bucket ontology uses metal material.

Added in antioxidant, stabilizer, fire retardant, pigment, inorganic filler, softening agent in the thermoplastic resin One or more.

The thermoplastic resin and the adhesive strength of the bucket body internal surface are not less than 0.1kg/25mm.

The coating thickness is 0.005-5mm.

A kind of preparation method of coating on inner surface bucket, by heating thermoplastic material to after melting, into it being blown into gas makes It expands and extends to and is melted completely in bucket body internal surface, makes thermoplastic material and the bucket body internal surface strong binding.

The gas selects one kind in air, oxygen, nitrogen, argon gas.

Thermoplastic material is with using reduced pressure treatment while the bucket body internal surface strong binding.

The heating temperature of thermoplastic material is more than or equal to glass transition temperature.

When specifically used, bucket ontology according to the present invention is that less than 18 liters or more 400 liters of made of metal is cylindric Container, shape are not particularly limited, and including known shape, such as opened type and head compact bucket.Furthermore, it is possible to Ladle body is welded and reinforcement, the various processing such as be embossed to top plate and bottom plate, and this processing can be in the present invention Inner surface coating process after carry out.Metal material used in bucket ontology, is not particularly limited, and can use steel, horse Various metals and its alloys such as mouth iron, tin ferroalloy, stainless steel, aluminium, copper, titanium.

Preferably, before being coated with resin, bucket ontology can carry out knownization in its inner surface and the outer surface Learn conversion processing or primary coat.Processing in this way can improve the durability of bucket and the adaptation of resin.

The inner surface coating that thermoplastic material carries out can be not only the bucket having been processed into, and can also be the rolling in processing Cylinder.That is, in the cup-shaped stage that body portion and bottom plate engage, after carrying out inner surface coating using the present invention, by with being separately laminated Processed top plate engagement, can manufacture coating on inner surface metal bucket, can be used for the part film of barrel inner surface.

As long as thermoplastic material can use known thermoplastic resin or thermoplasticity with the adhesiveness with metal Elastomer, for thermoplastic resin, can suitably use as polyethylene, polypropylene, polybutene, ethylene/alpha-olefin copolymer, Ethylene/vinyl acetate（EVA）Wait vistanexes, as polyvinyl chloride, polyvinyl acetate, polyvinylidene chloride, The polyvinyl resins such as polyvinyl alcohol, polyvinyl acetal, polyethylene terephthalate, poly terephthalic acid propylene glycol The polyester resin such as ester, polybutylene terephthalate (PBT), polyethylene naphthalate, polybutylene naphthalate such as gather Styrene resins, nylon-6, the Buddhist nuns such as styrene, styrene/acrylonitrile copolymer, styrene/acrylonitrile/butadiene copolymer Dragon -11, Nylon-12, nylon -66, nylon-610, nylon-6 12, nylon-6 T, nylon-6 I, nylon-9 T, nylon-M5T, polyamides The polyamide-based resins such as amine/polyether elastomer, polytetrafluoroethylene (PTFE)（PTFE）, polychlorotrifluoroethylene（PCTFE）, polyvinylidene fluoride （PVDF）, polyvinyl fluoride（PVF）, perfluoro alkoxy fluorocarbon resin（PFA）, tetrafluoraoethylene-hexafluoropropylene copolymer（FEP）, second Alkene-TFE copolymer（ETFE）, ethylene-chlorotrifluoro-ethylene copolymer（ECTFE）Fluoride resins are waited, such as makrolon gathers Acetal, polyphenylene oxide, polyarylate, polysulfones, polyether sulfone, polyphenylene sulfide, polyether-ether-ketone, polyimides, polyetherimide and upper State the type that polar group has been imported in the thermoplastic resin for having fine adhesiveness with metal or ionomer resin etc..With regard to thermoplasticity It, can be with preferred polyolefm class, polyurethanes, polyvinyl chloride-base, polystyrene type, polyesters, polyamide-based, poly- fourth for elastomer The thermoplastic elastomer (TPE) of dienes and substance of importing polar group etc. in above-mentioned thermoplastic elastomer (TPE).Above-mentioned thermoplasticity Material can be used alone, and can also mix two or more materials'use.

In above-mentioned thermoplastic material, come in terms of processability, resistance to material pollution, resistance to metal protection and economy It sees, particularly preferred polyethylene, polypropylene, polyester, polyamide and fluoride resin.

Thermoplastic material can contain known additive（Antioxidant, stabilizer, fire retardant, pigment, inorganic fill Agent, softening agent etc..

A kind of preparation method of coating on inner surface bucket, by heating thermoplastic material to after melting, into it being blown into gas makes It expands and extends to and is melted completely in bucket body internal surface, makes thermoplastic material and the bucket body internal surface strong binding.

For making the type of thermoplastic material expanding gas from the point of view of economy and safety, air, oxygen, nitrogen, Argon gas is preferred.The cylindrical thermoplastic resin that lower part is closed is melted by the method that gas expands thermoplastic material Body directly can make its expansion by gas from inside or flaked thermoplastic's material can also be set around rubber pneumatic bag Material, expands rubber pneumatic bag by gas, thus expands the thermoplastic sheets on the outside of it.

When carrying out strong binding to thermoplastic material and bucket body internal surface, can to the space segment between them into Row reduced pressure treatment.Due to by carrying out reduced pressure treatment, the bubble that with thermoplastic material-coated metal bucket inner surface when is formed will subtract It is few, make the stomata of bubble formation can also reduce.

The thermoplastic material in glass transition temperature or higher temperature is expanded by gas.Make at thermoplastic material In glass transition temperature or higher temperature, cracking or hair check can be inhibited when it is expanded.The vitrifying of thermoplastic material Transition temperature for example, using the test film of long 20mm × 3 millimeters wide × thickness 0.7mm, in 10 hertz of sinusoidal vibration frequency, measures - 50-200 DEG C of temperature, when Measurement of Dynamic Viscoelasticity is carried out under conditions of 3 DEG C/min of heating rate, it can be as the damage of main dispersion Consume angle tangent value（tanδ）Peak temperature be obtained.The glass transition temperature of Typical thermoplastic's material is as follows.（Polyethylene：- 125 DEG C, polypropylene：0 DEG C, polyvinyl chloride：87 DEG C, polystyrene：100 DEG C, nylon-6：50 DEG C, makrolon：150 DEG C, polyphenyl Thioether：126 DEG C, polyurethane：- 20 DEG C, polyethylene terephthalate：69 DEG C, polybutylene terephthalate (PBT)：50 DEG C, PTFE： 130℃）

Thermoplastic material is by the moment of strong binding, in terms of the adhesiveness with thermoplastic material, preferably above-mentioned glass Change transition temperature or higher temperature, from the point of view of adhesiveness this aspect with bucket body internal surface, more preferably not less than heat The temperature of plastic material fusing point.For temperature range, preferably 0 DEG C -500 DEG C, more preferable 25 DEG C -400 DEG C, still further preferably 50 DEG C -300 DEG C of temperature.By set temperature range, thermoplastic material can be made readily permeable to gold when being contacted with metal bucket The irregularity of metal surface, and high adhesion can be obtained.

The fusing point of thermoplastic material, from the point of view of processability, operability etc., 60 DEG C -500 DEG C of preferably fusing point, more preferably 80 DEG C -400 DEG C, still further preferably 100-300 DEG C of material.

The adhesive strength of bucket body internal surface is not particularly limited in thermoplastic resin layer, but at least between them must Attractive interaction must be applied.According to JISK6854, in T shape disbonded tests, adhesive strength is preferably not less than 0.1kg/25mm, more preferably no less than 1.0kg/25mm, the still further preferably adhesive strength not less than 2.0kg/25mm.Pass through By adhesive strength setting within the above range, it can obtain long-term durable, there is good material protective value and resistance to metal Corrosive bucket.

It is coated with known coating or powdex that primary bucket or inner surface have been applied for inner surface Bucket, can be coated with above-mentioned thermoplastic material repeatedly on the film of barrel inner surface is already present on.It is applied by forming multilayer inner surface Layer, can effectively inhibit caused by material to the metal erosion of bucket.

Thickness preferred 0.001-10.0mm, the more preferable 0.01-3.0mm of the thermoplastic coating of inner surface, then into one Walk the thickness of preferred 0.02-1.0mm.By the thickness setting of coating on inner surface within the above range, the corrosion of metal bucket can be inhibited Or the pollution of material.

When use be not easy the thermoplastic material with metal adhesive when, known adhesiveness improving environment can be used.Bonding Property improving environment example include sided corona treatment, flame treatment, corona treatment, excimer laser processing, ultraviolet light irradiation Processing, prime treatment etc..It is this thermoplastic material to be implemented for improving the processing of adhesiveness, bucket can also be implemented. When being carried out on thermoplastic material, it can melt and it is unfused under the conditions of be processed.On the other hand, to bucket into In the case of row processing, when having been coated with priming coat on the inner surface of bucket, film can be handled.Further, it is also possible to thermoplastic Property both material and metal bucket are handled.For above-mentioned prime treatment, adhesive, the anchoring of usual vehicle type can be used The non-solvent adhesives such as agent, hotmelt.By using above-mentioned adhesiveness improving environment, though when metal bucket inner surface with Temperature during thermoplastic material binds is low, is also preferably as high adhesion can be obtained from the point of view of production control aspect.

Embodiment 1：

The inner surface of open Tie Tong is coated with device shown in FIG. 1.First, bucket ontology 1 is set into processing unit (plant) In, polyethylene heating is melted to 135 DEG C in the melting tank 2 of thermoplastic material, and via ring pipe 3a by the poly- second of the melting Alkene is sent to the nozzle leading portion portion 3b positioned inside of iron drum depths.On the other hand, from blowing plant 4 via in loop pipe 3a Portion's compressed-air blows expand the polyethylene of melting at nozzle leading portion portion 3b.While the polyethylene expansion for making melting, By extending movable part 5 upward, nozzle leading portion portion 3b's rises in inside of iron drum, and the polyethylene of melting is made to melt in metal bucket The top on surface, so as to produce the metal bucket that inner surface is coated with polyethylene.The polyethylene film of obtained coating on inner surface metal bucket In without finding bubble or stomata.

Embodiment 2：

As shown in Fig. 2, the open bucket ontology 1 in addition to not having to embodiment 1, and with head tight type metal bucket 1a by spray nozzle front end portion 3b is inserted into, and be arranged on metal bucket 1a deep insides and thermoplastic material is become polypropylene from polyethylene from the bayonet of top plate, The heating temperature of molten thermoplastic material slot 2 is made to reach other than 180 DEG C, other are implemented in the same way with embodiment 1.It obtains Without finding bubble or stomata in the polypropylene film of coating on inner surface bucket.

Embodiment 3：

The inner surface of open metal bucket is coated with the processing unit (plant) described in Fig. 3.First, by polyethylene terephthalate Ester is heated to 280 DEG C in melting tank 2, is sent via loop pipe 3a to the spray nozzle front end portion 3b positioned at metal bucket internal upper part.The opposing party Face is blown into compressed nitrogen from blowing plant 4, and polyethylene terephthalate is made to be expanded into spray nozzle front end portion 3b on one side It is spherical, Expansion bar 6 is made to decline downwards on one side, and the polyethylene terephthalate for being expanded into sacculus shape is pushed to from inside Lower part thus melts it while the direction of control expansion and speed and arrives metal bucket inner surface.Obtained coating on inner surface Without finding bubble or stomata in the polyethylene terephthalate film of metal bucket.

Embodiment 4：

Pet film is coated in a manner of same as Example 3 open metal bucket inner surface it Afterwards, by by pet film laminating on the top plate with bayonet part, it is tight to manufacture head Close sections bucket.

Embodiment 5：

Processing unit (plant) is coated the inner surface of open metal bucket shown in Fig. 4.First, metal bucket is arranged on processing unit (plant) In, make rubber packing department 7 and metal bucket intimate contact with one another to form sealing system.Later, by polybutylene terephthalate (PBT) 250 DEG C are heated in melting tank 2, is sent via loop pipe 3a to spray nozzle front end portion 3b.On the other hand, from blowing plant 4 Compressed air is blown into, polybutylene terephthalate (PBT) is made to be expanded at spray nozzle front end portion 3b on one side, will be present in poly- pair on one side The gas of space segment between benzene dicarboxylic acid butanediol ester and metal bucket inner wall surface is discharged from pressure-reduction outlet 8, then in metal bucket Portion keeps strong binding under decompression state, so as to produce coating on inner surface metal bucket.Poly- pair of obtained coating on inner surface metal bucket Without finding bubble or stomata in benzene dicarboxylic acid butanediol ester film.

Embodiment 6：

The inner surface of open metal bucket is coated with processing unit (plant) shown in fig. 5.First, metal bucket is arranged on processing unit (plant) In, make rubber packing department 7 and metal bucket intimate contact with one another to form sealing system.Later, sheet of PTFE 9 is arranged on Viton Around air bag 10,170 DEG C are heated in inside of iron drum.After sheet of PTFE 9 is heated to 150 DEG C or more, removed from pressure-reduction outlet 8 The gas for the space segment being present between sheet of PTFE 9 and metal bucket inner wall is removed, internal pressure is reduced on one side, on one side from compressed air Device 4 is blown into compressed air, expands Viton air bag 10, so as to which the sheet of PTFE 9 being arranged on air bag periphery be stretched, and Metal bucket strong binding with being heated to 250 DEG C, is thus just made the metal bucket that inner surface is coated with PTFE.Obtained coating on inner surface iron Without finding bubble or stomata in the PTFE films of bucket.

Comparative example 1：

It, from other than 170 DEG C are changed into 110 DEG C, is used in a manner of in the same manner as in Example 6 in addition to by the environment temperature in metal bucket PTFE is coated with metal bucket inner surface.Many crackles and stomata are found on obtained coating on inner surface metal bucket.

Comparative example 2：

The inner surface of open metal bucket is coated with processing unit (plant) shown in fig. 5.Later, by polybutylene terephthalate Ester film is arranged on the periphery of Viton air bag 10, and 40 DEG C are heated in inside of iron drum.It is present in from the removing of pressure-reduction outlet 8 poly- to benzene The gas of space segment between dioctyl phthalate butanediol ester and metal bucket inner wall reduces internal pressure, on one side from compressed air on one side Device 4 is blown into compressed air, expands Viton air bag 10, poly- on 10 periphery of Viton air bag so as to be arranged on Mutual-phenenyl two acid bromide two alcohol ester's film stretching, and with being heated to 250 DEG C of metal bucket strong binding.In obtained coating on inner surface metal bucket It is upper to find many stomatas and bubble.

In conclusion by means of the above-mentioned technical proposal of the present invention, after heating thermoplastic material is extremely melted, Xiang Qi Inside being blown into gas expands it and extends to be melted completely in bucket body internal surface, makes thermoplastic material and table in the bucket ontology Face strong binding can be more convenient, and more effectively solve the problems, such as the bucket inner surface of manufacture and have bubble or stomata.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.

Claims (10)

1. a kind of coating on inner surface bucket, which is characterized in that including bucket ontology, the bucket body internal surface is coated with thermoplastic resin Fat, the coating thickness are 0.001-10mm.

2. a kind of coating on inner surface bucket according to claim 1, which is characterized in that the thermoplastic resin selection polyethylene, One or more of polypropylene, polyester, polyamide, fluoride resin.

3. a kind of coating on inner surface bucket according to claim 1, which is characterized in that the bucket ontology uses metal material.

4. a kind of coating on inner surface bucket according to claim 1, which is characterized in that antioxygen is added in the thermoplastic resin One or more of agent, stabilizer, fire retardant, pigment, inorganic filler, softening agent.

5. a kind of coating on inner surface bucket according to claim 1, which is characterized in that the thermoplastic resin and the bucket ontology The adhesive strength of inner surface is not less than 0.1kg/25mm.

6. a kind of coating on inner surface bucket according to claim 1, which is characterized in that the coating thickness is 0.005-5mm.

7. a kind of preparation method of coating on inner surface bucket, which is characterized in that by heating thermoplastic material to after melting, blown into it Entering gas expands it and extends to be melted completely in bucket body internal surface, makes thermoplastic material and the bucket body internal surface strong Power bonds.

8. a kind of coating on inner surface bucket preparation method according to claim 7, which is characterized in that the gas selection air, One kind in oxygen, nitrogen, argon gas.

9. a kind of coating on inner surface bucket preparation method according to claim 7, which is characterized in that thermoplastic material and the bucket Reduced pressure treatment is used while body internal surface strong binding.

A kind of 10. coating on inner surface bucket preparation method according to claim 7, which is characterized in that the heating of thermoplastic material Temperature is more than or equal to glass transition temperature.