CN108728784A - Non-sticking lining and preparation method thereof and cookware and equipment of cooking - Google Patents

Non-sticking lining and preparation method thereof and cookware and equipment of cooking Download PDF

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Publication number
CN108728784A
CN108728784A CN201710278205.XA CN201710278205A CN108728784A CN 108728784 A CN108728784 A CN 108728784A CN 201710278205 A CN201710278205 A CN 201710278205A CN 108728784 A CN108728784 A CN 108728784A
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China
Prior art keywords
powder
sticking lining
pfa
matrix
weight
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CN201710278205.XA
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CN108728784B (en
Inventor
李兴航
曹达华
李康
杨玲
李洪伟
屈雪平
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Priority to CN201710278205.XA priority Critical patent/CN108728784B/en
Priority to KR1020180046009A priority patent/KR102090639B1/en
Priority to JP2018083976A priority patent/JP6641411B2/en
Publication of CN108728784A publication Critical patent/CN108728784A/en
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    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/08Pressure-cookers; Lids or locking devices specially adapted therefor
    • A47J27/086Pressure-cookers; Lids or locking devices specially adapted therefor with built-in heating means
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00Parts, details or accessories of cooking-vessels
    • A47J36/02Selection of specific materials, e.g. heavy bottoms with copper inlay or with insulating inlay
    • A47J36/025Vessels with non-stick features, e.g. coatings
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00Baking; Roasting; Grilling; Frying
    • A47J37/06Roasters; Grills; Sandwich grills
    • A47J37/08Bread-toasters

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cookers (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

The present invention relates to electric heating appliance technical field, a kind of non-sticking lining and preparation method thereof and cookware and equipment of cooking are disclosed.This method includes:(1) matrix is pre-processed;(2) matrix surface for obtaining step (1) carries out the pre-heat treatment;(3) ceramic powders and modified PFA powder are mixed, obtains mixture of powders, mixture of powders is subjected to plasma spraying processing, to form non-sticking lining in matrix surface;Wherein, the sphericity of 80% or more the modified PFA powder is not less than 70%.The non-sticking lining of the present invention has many advantages, such as that case hardness is high, coating binding force is high, scraping and wiping resistance performance is good, corrosion resistance and good, wetability is good, service life is long.

Description

Non-sticking lining and preparation method thereof and cookware and equipment of cooking
Technical field
The present invention relates to electric heating appliance technical fields, and in particular to a kind of non-sticking lining and preparation method thereof and cookware and It cooks equipment.
Background technology
Existing non-sticking lining is mainly Teflon class PTFE non-sticking linings or ceramic non-stick coating, and these types of coating is normal The molding mode of rule is all and this coating life using air pressure spraying, high temperature sintering cures again after electrostatic spraying Generally only half a year arrives one-year age, and coating hardness is low that (Vickers hardness of PTFE non-sticking linings is 100-200HV, ceramic The Vickers hardness of non-sticking lining is 200-350HV), coating adhesion is small, and (binding force of PTFE non-sticking linings is 2-10MPa, pottery The binding force of porcelain non-sticking lining is 2-5MPa), smaller (thickness of PTFE non-sticking linings is 20-50 μm to coating layer thickness, ceramic non-stick The thickness of coating be 20-40 μm), acid and alkali-resistance and salt resistant character it is also general, in the long-term use inevitably scrape, grind Damage corrodes and leads to coating shedding, failure, and after face coat fails, this non-sticking lining will not have non-stick, this Service life and application to coating cause and significantly limit.
Existing cooking apparatus, including frying pan, electric cooker, inner tub of pressure cooker etc. use non-sticking lining on a large scale, and carry The critical issue of cooker industry is had become for a kind of coating for persistently not gluing, and haveing excellent performance.
Invention content
The purpose of the invention is to overcome the above problem of the existing technology, a kind of non-sticking lining and its preparation are provided Method and cookware and equipment of cooking, the non-sticking lining have high case hardness, coating binding force height, scraping and wiping resistance performance good, resistance to The advantages that corrosive nature is good, wetability is good, service life is long.
The present inventor is creative under study for action to be found, existing PFA powder, and grain size D50 is 5-30 μm, 90% with On sphericity be 10-30%, mobility 30-100s/50g, purity 90%-95%, fusing point be 300-400 DEG C, surface Roughness Ra is 0.5-0.8 μm, and using the existing PFA powder of aforementioned properties, (its microscopic appearance figure is as shown in Fig. 2, the powder Grain regularity is low, sphericity is low, size distribution is relatively also inhomogenous), it is difficult to meeting thermal spraying (such as plasma spraying) technique Manufacture requires, and it is high, resistance to that case hardness height, coating binding force can not be prepared by thermal spraying (such as plasma spraying) technique Scratch performance is good, corrosion resistance and good, wetability are good, non-sticking lining with long service life, and by existing PFA powder by special After processing, modification PFA powder of the sphericity of 80% or more powder not less than 70% is obtained (according to a kind of preferred implementation The grain size D50 of mode, modified PFA powder is 20-100 μm, and the sphericity of 80% or more modification PFA powder is 70-99%, is changed Property PFA powder mobility be less than 30s/50g), modification PFA powder disclosure satisfy that thermal spraying (such as plasma spraying) technique Construction, the non-sticking lining that can be had excellent performance using the material including modification PFA powder, and obtained non-sticking lining tool There are good high case hardness, coating binding force height, scraping and wiping resistance performance, corrosion resistance and good, good, the service life length of wetability etc. excellent Point.
Therefore, to achieve the goals above, one aspect of the present invention provides a kind of method preparing non-sticking lining, this method Including:
(1) matrix is pre-processed;
(2) matrix surface for obtaining step (1) carries out the pre-heat treatment;
(3) ceramic powders and modified PFA powder are mixed, obtains mixture of powders, mixture of powders is subjected to plasma Spray treatment, to form non-sticking lining in matrix surface;
Wherein, the sphericity of 80% or more the modified PFA powder is not less than 70%.
Second aspect of the present invention provides the non-sticking lining that the method for the invention is prepared.
Third aspect present invention provides a kind of cookware, which includes matrix and the non-sticking lining that is formed on matrix, The non-sticking lining includes ceramics and the mixed layer of PFA;Preferably, the non-sticking lining is non-sticking lining of the present invention.
Fourth aspect present invention provides one kind and cooks equipment, which includes cookware of the present invention.
The non-sticking lining of the present invention is by ceramic powders (preferably alumina powder and/or titanium dioxide powder) and specific ginseng Several modification PFA powder after evenly mixing, are deposited to using plasma spray coating process, by high speed and molten state on matrix, The process is passed through high-temperature fusion, is quickly cooled down, and high velocity impact arrives after so that ceramic powders and modified PFA powder is formed spheroidal fused state On matrix, using flattening, and numerous ceramic particle and modified PFA uniform particle mixing stackings form.The present invention's Non-sticking lining has high rigidity, high bond strength, high scratch resistance, highly corrosion resistant and good non-stick.
Wherein, the arrangement mode structural schematic diagram of the particle of the non-sticking lining of the present invention is formed as shown in figure 4, ceramic particle Intermesh distribution with modified PFA particles, ensure that the non-stick of coating surface and coat inside, scratch resistance, corrosion resistance, The performances such as wetability are evenly distributed, i.e., coating has good hydrophobicity, good scraping and wiping resistance performance, good corrosion resistance And high coating adhesion.In addition, the preparation method of the coating compared to conventional preparation method have the period it is short, it is efficient, The advantages that energy saving:The coating is only needed once to spray and can be completed, and thickness maximum up to 0.4mm, i.e., curing molding is heavy Product is completed on matrix;And the spraying method of electrostatic spraying or air pressure is used, spraying need to be first passed through, then carry out high temperature burning Knot, and if the too thick need point of prepares coating thickness are completed several times, to repeat spraying, sintering process.
Specifically, in the method for the invention that non-sticking lining is prepared using plasma spraying technology, using specific modified PFA powder, wherein according to a kind of preferred embodiment, the grain size D50 of modified PFA powder is 20-100 μm (further preferred It is 40-100 μm, is still more preferably 45-60 μm), the sphericity of the modification PFA powder of 80% or more (preferably 90% or more) For 70-99% (further preferably 90-99%), mobility be less than 30s/50g (further preferably 10-25s/50g, more into One step is preferably 10-20s/50g), the mixed-powder of modification PFA powder and ceramic powders sprays one layer in matrix surface and does not glue Coating, the non-sticking lining that can be had excellent performance, and obtained non-sticking lining with good hydrophobic self-cleaning property, with table Surface hardness height (Vickers hardness 300-550HV, preferably 450-550HV), coating binding force it is high (binding force 30-50MPa, it is excellent Select 40-50MPa), scraping and wiping resistance performance good (tablet is 6000-14000 times wear-resisting, preferably 11500-14000 times), spray efficiency it is high (25-70s/pcs, preferably 30-40s/pcs), coating porosity low (1-4.5%, preferably 1-2%), service life length, coating Thickness big (can be 30-400 μm), acid resistance good (phenomena such as no albefaction, blistering), alkali resistance good (phenomena such as no albefaction, blistering), The salt tolerance 13-21 periods, (preferably 20-21 periods, 1 period be:5 weight % brine laser heatings boiling 8h, 80 ° of lasting heat preservations 16h) the advantages that.In addition, the non-sticking lining is internal after surface abrasion still to have good wetability, as long as and not exposing base Body, wetability are always maintained at good (to PTFE non-sticking linings, ceramic non-stick coating and the non-sticking lining of the present invention these three samples Product carry out friction-wear test, it can be found that:It is de- that the non-sticking lining of the present invention only has part powdery in process of friction and wear It falls, does not influence performance, and PTFE non-sticking linings and ceramic non-stick coating are sheet intermediate peeling, are differed greatly), and should Non-sticking lining can be in direct contact with food, meet food hygiene certification.
Description of the drawings
Fig. 1 is the microscopic appearance figure for the modification PFA powder that preparation example 1 of the present invention obtains.
Fig. 2 is the microscopic appearance figure of existing PFA powder.
Fig. 3 is the structural schematic diagram of the cookware of the present invention.
Fig. 4 is the arrangement mode structural schematic diagram for the particle for forming the non-sticking lining of the present invention, wherein grey parts are pottery Porcelain particle (such as alumina particle and/or titan oxide particles), white portion are PFA particles.
Reference sign
1 is non-sticking lining, and 2 be matrix.
Specific implementation mode
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more New numberical range, these numberical ranges should be considered as specific open herein.
In a first aspect, the present invention provides a kind of method preparing non-sticking lining, this method includes:
(1) matrix is pre-processed;
(2) matrix surface for obtaining step (1) carries out the pre-heat treatment;
(3) ceramic powders and modified PFA powder are mixed, obtains mixture of powders, mixture of powders is subjected to plasma Spray treatment, to form non-sticking lining in matrix surface;
Wherein, the sphericity of 80% or more preferably 90% or more the modified PFA powder is not less than 70%.
In the method for the present invention, it will be understood by those skilled in the art that sphericity is the ball with particle same volume The sphericity of the ratio of the surface area of body and the surface area of the particle, ball is equal to 1, and other convex body sphericities are less than 1.80% or more The modified PFA powder sphericity be not less than 70%, refer to arbitrary sampling modification PFA powder in, sphericity is not less than The number or probability of the particle of 70% modification PFA powder account in the sampling number ratio for the particle for being all modified PFA powder Or probability proportion is 80% or more.
Under preferable case, the sphericity of 90% or more the modified PFA powder is not less than 70%.
Under preferable case, the grain size D50 of the modified PFA powder is 20-100 μm, further preferably 40-100 μm, more Further preferably 45-60 μm.
Under preferable case, the sphericity of 80% or more further preferred 90% or more the modified PFA powder is 70- 99%, further preferably 90-99%.
Under preferable case, the mobility of the modified PFA powder is less than 30s/50g, further preferably 10-25s/50g, Still more preferably it is 10-20s/50g.
Under preferable case, the purity of the modified PFA powder is 95.5%-99.99%, further preferably 99- 99.99%.
Under preferable case, the fusing point of the modified PFA powder is 350-420 DEG C, further preferably 400-420 DEG C.
Under preferable case, the surface roughness Ra of the modified PFA powder is 0.1-0.45 μm, further preferably Ra 0.1-0.3μm。
In the case of process of the present invention it is preferred, meet the modification PFA powder of aforementioned parameters condition by including the following steps Method be prepared:
(a) PFA powder, binder, lubricant and water are mixed, prepares slurry;
(b) slurry is subjected to spray drying treatment.
Preferably, in step (a), on the basis of the weight of slurry, the content of PFA powder is 30-60 weight %, further Preferably 38-55 weight %;The content of binder is 0.2-2 weight %, further preferably 0.2-0.5 weight %;Lubricant Content be 0.5-3 weight %, further preferably 1-3 weight %;The content of water is 35-68 weight %, further preferably 42-60 weight %.
Preferably, in step (a), the binder is at least one in polyvinyl alcohol, polyvinyl chloride and polyacrylate Kind.
Preferably, in step (a), the lubricant is at least one of glycerine, paraffin and graphite.
Preferably, in step (b), the mode of the spray drying treatment is dried for aerodynamic atomization, and the aerodynamic atomization is dry Dry condition includes:Atomizing pressure is 0.3-0.6MPa, further preferably 0.3-0.5MPa;Atomization air flow flow is 1-4m3/ H, further preferably 1-3m3/h;Inlet temperature is 200-400 DEG C, further preferably 300-350 DEG C;Air outlet temperature is 50-200 DEG C, further preferably 50-150 DEG C.
In the method for the present invention, matrix can be the gold such as stainless steel base, aluminum substrate, alloy matrix aluminum, titanium alloy substrate Belong to matrix or multilayer (including bilayer and three layers or more) metal clad substrates.Wherein, multilayer metal compound matrix can be not Become rusty steel/aluminum substrate, stainless steel/copper matrix, stainless steel/aluminium/Copper substrate etc..Preferably, the thickness of matrix is 0.5-6mm.
In the method for the present invention, the pretreated method of step (1) may include blasting treatment and ungrease treatment, for spray There is no particular limitation for sand processing and the method for ungrease treatment, can be respectively various methods commonly used in the art.For example, sandblasting The method of processing includes:Using the sand grains (such as glass sand, brown steel sand, black brown jade, white fused alumina, diamond dust) of 60-150 mesh, control Jet Stream pressure processed is 0.2-0.9MPa, and obtained roughness is about Ra 2-8 μm.It, need to be by matrix after blasting treatment The removings such as the remaining fine powder particles of inner surface, for the method for removing, there is no particular limitation, can be blown with high pressure draught It can also totally be removed by washing, this is well known to the skilled person, and details are not described herein.For example, ungrease treatment Method can include alkali cleaning, pickling, washing and high temperature drying (such as 200-450 DEG C drying 10-15min) successively.
In the case of process of the present invention it is preferred, in step (2), the matrix surface that step (1) obtains is preheated to 100- 150℃。
In the case of process of the present invention it is preferred, in step (3), in mixture of powders, modified PFA powder and ceramic powder The weight ratio at end is 1:(2-6), further preferably 1:(3-5).
Preferably, ceramic powders are alumina powder and/or titanium dioxide powder, further preferably alumina powder and oxygen Change titanium powder, it is further preferred that the weight ratio of alumina powder and titanium dioxide powder is 1:(0.05-0.4), further Preferably 1:(0.2-0.3).
Preferably, the grain size D50 of the alumina powder is 5-80 μm (further preferably 5-30 μm), 90% or more The sphericity of alumina powder is 70-100%, mobility 10-30s/50g.
Preferably, the grain size D50 of the titanium dioxide powder is 5-80 μm (further preferably 5-25 μm), 90% or more The sphericity of titanium dioxide powder is 70-100%, mobility 10-30s/50g.
Preferably, in step (3), the condition of the plasma spraying processing includes:Spray power is 25-60kW, into one Step is preferably 35-45kW, is still more preferably 38-42kW;Spray distance is 60-100mm, further preferably 75-85mm; Spray angle is 70-90 °, further preferably 75-85 °;Powder powder sending quantity is 3.5-10g/min, further preferably 5-7g/ min;PFA spraying temperatures are 300-350 DEG C, further preferably 315-335 DEG C;The spraying temperature of aluminium oxide and titanium oxide is 2800-3200 DEG C, further preferably 2900-3100 DEG C;Spray voltage is 50-70V, further preferably 55-65V;Spraying Electric current is 600-650A, further preferably 620-630A;Coating thickness is 30-400 μm, further preferably 150-300 μm; Main gas is hydrogen, auxiliary gas is argon gas, hydrogen flowing quantity 2-6L/min, further preferably 3-5L/min;Argon flow amount is 25- 35L/min, further preferably 28-32L/min.Wherein, before carrying out plasma spraying processing, each powder can be mixed 1-2h is first stirred afterwards, and 1-1.5h is then dried at 100-120 DEG C.
Second aspect, the present invention provides the non-sticking linings that the above method is prepared.
The third aspect, as shown in figure 3, the present invention provides a kind of cookware, which includes matrix 2 and is formed in matrix 2 On non-sticking lining 1, the non-sticking lining 1 include ceramics and PFA mixed layer.Wherein, the mixed layer of the ceramics and PFA are served as reasons The coating that the mixed-powder of ceramic powders and PFA powder is formed, i.e. ceramics/PFA coatings.
Preferably, as shown in figure 4, in the non-sticking lining, ceramic particle and PFA particles are arranged in a manner of being interspersed Row.
Preferably, in non-sticking lining, the weight ratio of PFA and ceramics is 1:(2-6), further preferably 1:(3-5).
Preferably, the ceramics are aluminium oxide and/or titanium oxide, further preferably aluminium oxide and titanium oxide, more into one Preferably, the weight ratio of aluminium oxide and titanium oxide is 1 to step:(0.05-0.4), much further preferably from 1:(0.2-0.3).
Wherein, matrix can be the metallic matrixes such as stainless steel base, aluminum substrate, alloy matrix aluminum, titanium alloy substrate or Multilayer (including bilayer and three layers or more) metal clad substrates.Wherein, multilayer metal compound matrix can be stainless steel/aluminium base Body, stainless steel/copper matrix, stainless steel/aluminium/Copper substrate etc..
Preferably, the thickness of matrix is 0.5-6mm.
Preferably, the thickness of the non-sticking lining be 30-400 μm, further preferably 50-300 μm, still more preferably It is 150-300 μm.
Preferably, the non-sticking lining is non-sticking lining of the present invention.
Fourth aspect is cooked equipment the present invention provides one kind, which includes cookware of the present invention.It is preferred that Ground, the equipment of cooking is frying pan, frying pan, air fryer, baking machine, bread producing machine, electric cooker, electric pressure cooking saucepan or soy bean milk making machine.
It below will the present invention will be described in detail by preparation example and embodiment.In following preparation example and embodiment, such as Without special instruction, each material used is commercially available, and each method used is the common method of this field.
PFA powder is measured using laser particle size analyzer (being purchased from Xiamen Ke Wang Electronics Co., Ltd.s, model KW510) Grain size D50.
PFA powder is measured (purchased from the American-European gram Instrument Ltd. in Zhuhai, model PIP8.1) using particle image analyzer The sphericity of last particle.
The mobility of PFA powder is measured using Hall flowmeter according to GB1482-84.
The purity of PFA powder is measured using automatic polarimeter (opening up China, model AP-300 purchased from love).
PFA is measured using micro melting point apparatus (being purchased from Jinan Hanon Instruments Co., Ltd., model MP-300) The fusing point of powder.
PFA is measured using surface roughometer (being purchased from Beijing Time Zhifeng Science Co., Ltd, model TIME3201) The surface roughness Ra of powder.
It is measured using contact angle measurement (being purchased from Xin Hengsen trade Co., Ltds of Shenzhen, model XHSCAZ-2) original Contact angle after contact angle and friction, measurement range are 0-180 °.
Common PFA powder is purchased from Dajin Fluorine Coating (Shanghai) Co., Ltd., and grain size D50 is 15 μm, the ball of 95% powder Shape degree is 18%, mobility 78s/50g, purity 94%, and fusing point is 345 DEG C, and surface roughness is 0.6 μm of Ra.
Polyvinyl alcohol is purchased from Shanghai Fu Sichun Chemical Industry Science Co., Ltd, model PVA1788.
Polyvinyl chloride is purchased from Shanghai Ji Ning Industrial Co., Ltd.s, model K55-59.
Polyacrylate has company, model SL325 purchased from Changzhou spring Jiang Huaxue.
Alumina powder is purchased from Beijing Sang Yao Science and Technology Development Co., Ltd.s, and grain size D50 is 25 μm, the spherical shape of 95% powder Degree is 95%, mobility 12s/50g.
Titanium dioxide powder is purchased from Beijing Sang Yao Science and Technology Development Co., Ltd.s, and grain size D50 is 22 μm, the spherical shape of 95% powder Degree is 92%, mobility 18s/50g.
Preparation example 1
(1) the common PFA powder of 47.6kg, 0.4kg polyvinyl alcohol, 2kg glycerine and 50kg water are mixed, prepares slurry;
(2) by slurry carry out aerodynamic atomization drying process, wherein aerodynamic atomization drying condition include:Atomizing pressure is 0.4MPa, atomization air flow flow are 2m3/ h, inlet temperature are 320 DEG C, and air outlet temperature is 100 DEG C, obtain modified PFA powder S1。
After measured, the grain size D50 of modified PFA powder is 52 μm, and the sphericity of 96% powder is 95%, and mobility is 15s/50g, purity 99.9%, fusing point are 410 DEG C, and surface roughness is 0.2 μm of Ra.The microscopic appearance of modification PFA powder Figure is as shown in Figure 1.
Preparation example 2
(1) the common PFA powder of 54.8kg, 0.2kg polyvinyl chloride, 3kg paraffin and 42kg water are mixed, prepares slurry;
(2) by slurry carry out aerodynamic atomization drying process, wherein aerodynamic atomization drying condition include:Atomizing pressure is 0.3MPa, atomization air flow flow are 1m3/ h, inlet temperature are 300 DEG C, and air outlet temperature is 60 DEG C, obtain modified PFA powder S2。
After measured, the grain size D50 of modified PFA powder is 46 μm, and the sphericity of 95% powder is 93%, and mobility is 13s/50g, purity 99.5%, fusing point are 405 DEG C, and surface roughness is 0.15 μm of Ra.
Preparation example 3
(1) the common PFA powder of 38.5kg, 0.5kg polyacrylates, 1kg graphite and 60kg water are mixed, prepares slurry;
(2) by slurry carry out aerodynamic atomization drying process, wherein aerodynamic atomization drying condition include:Atomizing pressure is 0.5MPa, atomization air flow flow are 3m3/ h, inlet temperature are 350 DEG C, and air outlet temperature is 140 DEG C, obtain modified PFA powder S3。
After measured, the grain size D50 of modified PFA powder is 59 μm, and the sphericity of 95% powder is 98%, and mobility is 18s/50g, purity 99.9%, fusing point are 418 DEG C, and surface roughness is 0.28 μm of Ra.
Preparation example 4
(1) the common PFA powder of 32.2kg, 1kg polyvinyl alcohol, 1.8kg glycerine and 65kg water are mixed, prepares slurry;
(2) by slurry carry out aerodynamic atomization drying process, wherein aerodynamic atomization drying condition include:Atomizing pressure is 0.58MPa, atomization air flow flow are 3.9m3/ h, inlet temperature are 210 DEG C, and air outlet temperature is 52 DEG C, obtain modified PFA powder Last S4.
After measured, the grain size D50 of modified PFA powder is 42 μm, and the sphericity of 90% powder is 75%, and mobility is 12s/50g, purity 96%, fusing point are 352 DEG C, and surface roughness is 0.12 μm of Ra.
Preparation example 5
(1) the common PFA powder of 58kg, 1.8kg polyvinyl alcohol, 0.6kg glycerine and 39.6kg water are mixed, prepares slurry;
(2) by slurry carry out aerodynamic atomization drying process, wherein aerodynamic atomization drying condition include:Atomizing pressure is 0.32MPa, atomization air flow flow are 3.2m3/ h, inlet temperature are 390 DEG C, and air outlet temperature is 195 DEG C, obtain modified PFA powder Last S5.
After measured, the grain size D50 of modified PFA powder is 98 μm, and the sphericity of 88% powder is 90%, and mobility is 24s/50g, purity 99.7%, fusing point are 415 DEG C, and surface roughness is 0.42 μm of Ra.
Embodiment 1
The method that the present embodiment is used to illustrate to prepare non-sticking lining using plasma spraying method.
(1) aluminum pot matrix is pre-processed, wherein pretreated method includes:A) oil removing 8 minutes at a temperature of 55 DEG C; B) it is cleaned with deionized water;C) 100 DEG C of drying 5min;D) the brown steel sand for using 60-80 mesh, in the Jet Stream pressure of 0.6MPa Under blasting treatment is carried out to aluminum pot base inner surface its surface roughness is made to be 3 μm of Ra, then with air-flow by table in pot body matrix The remaining powder particle in face is blown clean;E) with the NaOH solution of 40 weight % at 80 DEG C alkali cleaning 1 minute;F) with 20 weight %'s In salpeter solution and 3 minutes;G) it after being cleaned with deionized water, is dried 12 minutes at 300 DEG C;
(2) matrix surface that step (1) obtains is preheated to 120 DEG C;
(3) 160kg alumina powders, 40kg titanium dioxide powders and 50kg are modified PFA powder S1 to mix, are dried at 110 DEG C Dry 1h, obtains mixture of powders, and mixture of powders is carried out plasma spraying processing, to form non-sticking lining in matrix surface Q1;Wherein, the condition of plasma spraying processing includes:Spray power is 40kW, and spray distance 80mm, spray angle is 80 ° ± 1 °, powder powder sending quantity is 6g/min, and PFA spraying temperatures are 330 DEG C, and aluminium oxide and titanium oxide spraying temperature are 3000 DEG C, spray Painting voltage is 60V, and spraying current 625A, coating thickness is 180 μm, and main gas is hydrogen, auxiliary gas is argon gas, and hydrogen flowing quantity is 4L/min, argon flow amount 30L/min.
Embodiment 2
The method that the present embodiment is used to illustrate to prepare non-sticking lining using plasma spraying method.
(1) stainless-steel pan matrix is pre-processed, wherein pretreated method includes:A) oil removing 8 at a temperature of 55 DEG C Minute;B) it is cleaned with deionized water;C) 100 DEG C of drying 5min;D) the brown steel sand for using 60-80 mesh, in the jet gas of 0.8MPa Carrying out blasting treatment to stainless-steel pan base inner surface under flowing pressure makes its surface roughness be 3 μm of Ra, then with air-flow by pot The remaining powder particle of body base inner surface is blown clean;E) with the NaOH solution of 40 weight % at 80 DEG C alkali cleaning 1 minute;F) it uses In the salpeter solution of 20 weight % and 3 minutes;G) it after being cleaned with deionized water, is dried 11 minutes at 375 DEG C;
(2) matrix surface that step (1) obtains is preheated to 100 DEG C;
(3) 125kg alumina powders, 25kg titanium dioxide powders and 50kg are modified PFA powder S2 to mix, are dried at 100 DEG C Dry 1.5h, obtains mixture of powders, and mixture of powders is carried out plasma spraying processing, to form non-sticking lining in matrix surface Q2;Wherein, the condition of plasma spraying processing includes:Spray power is 35kW, and spray distance 75mm, spray angle is 76 ° ± 1 °, powder powder sending quantity is 7g/min, and PFA spraying temperatures are 315 DEG C, and aluminium oxide and titanium oxide spraying temperature are 2900 DEG C, spray Painting voltage is 55V, and spraying current 630A, coating thickness is 150 μm, and main gas is hydrogen, auxiliary gas is argon gas, and hydrogen flowing quantity is 3L/min, argon flow amount 28L/min.
Embodiment 3
The method that the present embodiment is used to illustrate to prepare non-sticking lining using plasma spraying method.
(1) stainless-steel pan matrix is pre-processed, wherein pretreated method includes:A) oil removing 8 at a temperature of 55 DEG C Minute;B) it is cleaned with deionized water;C) 100 DEG C of drying 5min;D) the brown steel sand for using 60-80 mesh, in the jet gas of 0.8MPa Carrying out blasting treatment to stainless-steel pan base inner surface under flowing pressure makes its surface roughness be 4 μm of Ra, then with air-flow by pot The remaining powder particle of body base inner surface is blown clean;E) with the NaOH solution of 40 weight % at 80 DEG C alkali cleaning 1 minute;F) it uses In the salpeter solution of 20 weight % and 3 minutes;G) it after being cleaned with deionized water, is dried 10 minutes at 450 DEG C;
(2) matrix surface that step (1) obtains is preheated to 150 DEG C;
(3) 192kg alumina powders, 58kg titanium dioxide powders and 50kg are modified PFA powder S3 to mix, are dried at 100 DEG C Dry 1.5h, obtains mixture of powders, and mixture of powders is carried out plasma spraying processing, to form non-sticking lining in matrix surface Q3;Wherein, the condition of plasma spraying processing includes:Spray power is 45kW, and spray distance 85mm, spray angle is 84 ° ± 1 °, powder powder sending quantity is 5g/min, and PFA spraying temperatures are 335 DEG C, and aluminium oxide and titanium oxide spraying temperature are 3100 DEG C, spray Painting voltage is 65V, and spraying current 620A, coating thickness is 250 μm, and main gas is hydrogen, auxiliary gas is argon gas, and hydrogen flowing quantity is 5L/min, argon flow amount 32L/min.
Embodiment 4
According to the method for embodiment 1, the difference is that, the modified PFA powder of plasma spraying processing modification PFA powder used Last S4 is replaced.
Embodiment 5
According to the method for embodiment 1, the difference is that, the modified PFA powder of plasma spraying processing modification PFA powder used Last S5 is replaced.
Embodiment 6
According to the method for embodiment 1, the difference is that, in step (3), mixture of powders is 80kg alumina powders, 20kg Titanium dioxide powder and 50kg are modified the mixture of PFA powder S1.
Embodiment 7
According to the method for embodiment 1, the difference is that, in step (3), mixture of powders is 240kg alumina powders, 60kg Titanium dioxide powder and 50kg are modified the mixture of PFA powder S1.
Embodiment 8
According to the method for embodiment 1, unlike, in step (3), mixture of powders be 200kg alumina powders and 50kg is modified the mixture of PFA powder S1.
Embodiment 9
According to the method for embodiment 1, unlike, in step (3), mixture of powders be 200kg titanium dioxide powders and 50kg is modified the mixture of PFA powder S1.
Embodiment 10
According to the method for embodiment 1, the difference is that, in step (3), the condition of plasma spraying processing includes:Spray work( Rate is 25kW, and spray distance 60mm, spray angle is 71 ° ± 1 °, and powder powder sending quantity is 3.5g/min, and PFA spraying temperatures are 300 DEG C, aluminium oxide and titanium oxide spraying temperature are 2800 DEG C, spray voltage 50V, spraying current 600A, and coating thickness is 100 μm, main gas is hydrogen, auxiliary gas is argon gas, hydrogen flowing quantity 2L/min, argon flow amount 25L/min.
Comparative example 1
According to the method for embodiment 1, the difference is that, the PFA powder used is common PFA powder, coated in plasma spray Cheng Zhong, common PFA powder can block spray gun, cause powder that cannot send out, and can not form coating.
Comparative example 2
According to the method for embodiment 1, the difference is that, the method that non-sticking lining is formed in step (3)-(4) is:Using common PFA powder carries out electrostatic spraying processing, to form PFA non-sticking linings D1 in matrix surface, wherein the condition of electrostatic spraying processing Including:Powder spray, voltage 35kV are carried out using electrostatic gun, electrostatic induced current is 15 μ A, velocity pressure 0.45MPa, mist Change pressure is 0.4MPa, and spray-on coating thickness is 40 μm, dry in infra-red furnace after the completion of spraying, is dried in 120 DEG C of low-temperature zones 10min keeps the temperature 20min in 400 DEG C of high temperature sections.
Comparative example 3
PTFE non-sticking linings are sprayed using air pressure spraying method, which includes bottom knead dough layer;Base oil includes fluorine Resin, binder, pigment and auxiliary agent, face oil include fluororesin, abrasion resistant particles and coalescents.Specific steps include:
(1) aluminum pot matrix is pre-processed according to (1) the step of embodiment 1;
(2) matrix surface that step (1) obtains is preheated to 85 DEG C;
(3) base oil sprays:Spray pressure is 0.3MPa, and spray angle is 70 °, spray distance 30cm, and thicknesses of layers is 20 μm, drying temperature is 130 DEG C, keeps the temperature 12min;
(4) face oil sprays:Spray pressure is 0.4MPa, and spray angle is 70 °, and spray distance is 35 μm, and film thickness is 30 μm, Baking and curing temperature is 420 DEG C, keeps the temperature 15min.
Comparative example 4
Using the ceramic coated non-sticking lining of air pressure spraying method, which includes bottom knead dough layer;Base oil includes viscous It includes silica and aluminium oxide to tie agent, pigment and auxiliary agent, face oil.Specific steps include:
(1) aluminum pot matrix is pre-processed according to (1) the step of embodiment 1;
(2) matrix surface that step (1) obtains is preheated to 60 DEG C;
(3) base oil sprays:Spray pressure is 0.3MPa, and spray angle is 70 °, spray distance 25cm, and thicknesses of layers is 25 μm, predrying temperature is 70 DEG C, keeps the temperature 10min;
(4) face oil sprays:Spray pressure is 0.3MPa, and spray distance 25cm, spray angle is 70 °, and thicknesses of layers is 10 μm, 280 DEG C of sintering after the completion of spraying keep the temperature 15min.
Test example
1, coating surface hardness:The rectangular optical instrument in Shanghai (is purchased from using Vickers according to GB/T 9790-1988 Co., Ltd, model HX-1000) measure the Vickers hardness of each coating.It the results are shown in Table 1.
2, coating binding force:Coating binding force is measured according to G9 8642-88.It the results are shown in Table 1.
3, coating porosity:Coating porosity is measured according to People's Republic of China (PRC) machinery industry standard JB/T7509-94. It the results are shown in Table 1.
4, coating spraying efficiency:According to formula:Spray efficiency=(workpiece weight before workpiece weight-spraying after spraying)/(powder Last powder sending quantity deposition) it calculates, wherein deposition is fixed as 70%.Result of calculation is shown in Table 1.
5, coating scratch resistance:With the washings that liquid detergent compound concentration is 5 weight %, 3M (7447C) scouring pad bears a heavy burden 2.5kgf, the one way that swings be 1 time, it is every 250 times replacement scouring pad, check every time scrape after coating whether fall off or whether Expose base material (to expose >=10 lines as termination test), and records abrasion resistance.It the results are shown in Table 1.
6, acid and alkali resistance, salt:
It is acidproof:The acetum of a concentration of 5 weight % is added into interior pot at interior pot inner wall maximum scale water level, Interior pot is put into energization closing lid laser heating in corresponding stew and boils (holding fluidized state) 10 minutes, then 100 DEG C of heat-insulation soakings 24 hours, interior pot is cleaned up after the test, visually inspects coating surface changing condition, the results are shown in Table 2.
It is alkaline-resisting:The sodium hydroxide solution of a concentration of 0.5 weight % is added into interior pot until interior pot inner wall maximum scale At water level, interior pot is put into energization closing lid laser heating in corresponding stew and boils and (keeps fluidized state) 10 minutes, is then protected for 100 DEG C Temperature is impregnated 24 hours, after the test cleans up interior pot, is visually inspected coating surface changing condition, be the results are shown in Table 2.
Salt tolerant:The sodium chloride solution of a concentration of 5 weight % is added into interior pot until interior pot inner wall maximum scale water level Interior pot is put into energization closing lid laser heating in corresponding stew and boils 8 hours (every 2 hours amount of makeup water 1 time, liquid level is kept by place Position in on-test), it is a cycle that 80 DEG C, which keep the temperature 16 hours, visual inspection coating surface variation after each cycle experiment There is the periodicity of the bad phenomenons such as blistering, salient point, the results are shown in Table 2 in situation, record coating.
7, wear resistance and wetability:Friction-wear test is carried out according to GB/T 1768-79 (89), measures and weighing rubs Contact angle (being respectively contact angle after original contact angle and friction) before and after wiping wear test and weight, weightlessness is calculated according to formula Than, wherein weight before weightless ratio=(weight after weight-friction before friction)/friction the results are shown in Table 3.Wherein, test result is aobvious Show:The non-sticking lining of the present invention is internal after surface abrasion still to have good wetability, as long as and do not expose matrix, moisten It is moist to be always maintained at well, to PTFE non-sticking linings, ceramic non-stick coating and these three samples progress of the non-sticking lining of the present invention Friction-wear test, it can be found that:The non-sticking lining of the present invention only has part powdery in process of friction and wear and falls off, not shadow Performance is rung, and PTFE non-sticking linings and ceramic non-stick coating are sheet intermediate peeling, are differed greatly.
Table 1
Note:-- expression does not measure, similarly hereinafter.
Table 2
Table 3
Rubbing number Weightlessness is than (%) Original contact angle (°) Contact angle (°) after friction
Embodiment 1 1000 1.2 105 100
Embodiment 1 2000 2.2 105 98
Embodiment 1 3000 3.1 105 95
Embodiment 2 1000 1.3 110 105
Embodiment 3 1000 1.15 100 96
Embodiment 4 1000 2.1 98 82
Embodiment 5 1000 2.5 95 80
Embodiment 6 1000 1.4 113 107
Embodiment 7 1000 1.0 99 90
Embodiment 8 1000 1.8 103 95
Embodiment 9 1000 1.5 101 91
Embodiment 10 1000 2.5 100 91
Comparative example 1 -- -- -- --
Comparative example 2 1000 6.0 125 90
Comparative example 3 1000 8.9 121 87
Comparative example 4 1000 4.8 110 78
It can be seen that the method that non-sticking lining is prepared using plasma spraying technology of the present invention by the result of table 1-3 In, one layer of non-sticking lining can be sprayed in matrix surface using the mixture of specific modified PFA powder and ceramic powders, it can The non-sticking lining being had excellent performance, and obtained non-sticking lining has high case hardness, coating binding force height, scraping and wiping resistance performance Well, the advantages that corrosion resistance and good, wetability are good, service life is long.
Wherein, by the results contrast of embodiment 1 and embodiment 4-5 it is found that when the grain size D50 of modified PFA powder is 45-60 μm, the sphericity of the powder of 80 or more % is 90-99% can further increase not snearing when mobility is 10-20s/50g Case hardness, coating binding force, scraping and wiping resistance performance, corrosion resistance, wetability and the service life of layer.
Wherein, by the results contrast of embodiment 1 and embodiment 10 it is found that under specific plasma spraying treatment conditions (i.e. spray power is 35-45kW, and spray distance 75-85mm, spray angle is 75-85 °, and powder powder sending quantity is 5-7g/min, PFA spraying temperatures are 315-335 DEG C, and the spraying temperature of aluminium oxide and titanium oxide is 2900-3100 DEG C, spray voltage 55- 65V, spraying current 620-630A, coating thickness are 150-300 μm, and main gas is hydrogen, auxiliary gas is argon gas, hydrogen flowing quantity 3- 5L/min, argon flow amount 28-32L/min), the case hardness of non-sticking lining, coating binding force, scratch resistance can be further increased Wipe performance, corrosion resistance, wetability and service life.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In the skill of the present invention In art conception range, technical scheme of the present invention can be carried out a variety of simple variants, including each technical characteristic with it is any its Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, belongs to Protection scope of the present invention.

Claims (10)

1. a kind of method preparing non-sticking lining, which is characterized in that this method includes:
(1) matrix is pre-processed;
(2) matrix surface for obtaining step (1) carries out the pre-heat treatment;
(3) ceramic powders and modified PFA powder are mixed, obtains mixture of powders, mixture of powders is subjected to plasma spraying Processing, to form non-sticking lining in matrix surface;
Wherein, the sphericity of 80% or more preferably 90% or more the modified PFA powder is not less than 70%.
2. according to the method described in claim 1, wherein, the grain size D50 of the modified PFA powder is 20-100 μm, preferably 40-100 μm, further preferably 45-60 μm;And/or
The sphericity of 80% or more preferably 90% or more the modified PFA powder is 70-99%, preferably 90-99%;With/ Or
The mobility of the modified PFA powder is less than 30s/50g, preferably 10-25s/50g, further preferably 10-20s/ 50g。
3. method according to claim 1 or 2, wherein the purity of the modified PFA powder is 95.5%-99.99%, Preferably 99-99.99%;And/or
The fusing point of the modified PFA powder is 350-420 DEG C, preferably 400-420 DEG C;And/or
The surface roughness of the modified PFA powder is Ra 0.1-0.45 μm, preferably Ra 0.1-0.3 μm.
4. according to the method described in any one of claim 1-3, wherein the modified PFA powder is by including the following steps Method be prepared:
(a) PFA powder, binder, lubricant and water are mixed, prepares slurry;
(b) slurry is subjected to spray drying treatment;
Preferably, in step (a), on the basis of the weight of slurry, the content of PFA powder is 30-60 weight %, further preferably For 38-55 weight %;The content of binder is 0.2-2 weight %, further preferably 0.2-0.5 weight %;Lubricant contains Amount is 0.5-3 weight %, further preferably 1-3 weight %;The content of water is 35-68 weight %, further preferably 42-60 Weight %;
Preferably, in step (b), the mode of the spray drying treatment is dried for aerodynamic atomization, the aerodynamic atomization drying Condition includes:Atomizing pressure is 0.3-0.6MPa, further preferably 0.3-0.5MPa;Atomization air flow flow is 1-4m3/ h, into One step is preferably 1-3m3/h;Inlet temperature is 200-400 DEG C, further preferably 300-350 DEG C;Air outlet temperature is 50- 200 DEG C, further preferably 50-150 DEG C.
5. according to the method described in any one of claim 1-4, wherein in step (2), matrix that step (1) is obtained Surface is preheated to 100-150 DEG C.
6. according to the method described in any one of claim 1-5, wherein in step (3), in mixture of powders, modified PFA The weight ratio of powder and ceramic powders is 1:2-6, preferably 1:3-5;
Preferably, the ceramic powders are alumina powder and/or titanium dioxide powder, further preferably alumina powder and oxygen Change titanium powder, it is further preferred that the weight ratio of alumina powder and titanium dioxide powder is 1:0.05-0.4;
Preferably, the grain size D50 of the alumina powder is 5-80 μm, and the sphericity of 90% or more alumina powder is 70- 100%, mobility 10-30s/50g;
Preferably, the grain size D50 of the titanium dioxide powder is 5-80 μm, and the sphericity of 90% or more titanium dioxide powder is 70- 100%, mobility 10-30s/50g.
7. according to the method described in any one of claim 1-6, wherein in step (3), the plasma spraying processing Condition includes:Spray power is 25-60kW, preferably 35-45kW;Spray distance is 60-100mm, preferably 75-85mm;Spray It is 70-90 °, preferably 75-85 ° to apply angle;Powder powder sending quantity is 3.5-10g/min, preferably 5-7g/min;PFA spraying temperature Degree is 300-350 DEG C, preferably 315-335 DEG C;The spraying temperature of aluminium oxide and titanium oxide is 2800-3200 DEG C, preferably 2900-3100℃;Spray voltage is 50-70V, preferably 55-65V;Spraying current is 600-650A, preferably 620-630A; Coating thickness is 30-400 μm, preferably 150-300 μm;Main gas is hydrogen, auxiliary gas is argon gas, hydrogen flowing quantity 2-6L/min, Preferably 3-5L/min;Argon flow amount is 25-35L/min, preferably 28-32L/min.
8. the non-sticking lining that any one of claim 1-7 the methods are prepared.
9. a kind of cookware, which is characterized in that the cookware includes matrix and the non-sticking lining that is formed on matrix, the non-sticking lining Mixed layer including ceramics and PFA;
Preferably, in the non-sticking lining, ceramic particle and PFA particles are arranged in a manner of being interspersed;
Preferably, in non-sticking lining, the weight ratio of PFA and ceramics is 1:2-6, further preferably 1:3-5;
Preferably, the ceramics are aluminium oxide and/or titanium oxide, further preferably aluminium oxide and titanium oxide;
Preferably, the thickness of described matrix is 0.5-6mm;
Preferably, the non-sticking lining is 30-400 μm, and further preferably 50-300 μm, be still more preferably 150-300 μ m;
Preferably, the non-sticking lining is non-sticking lining according to any one of claims 8.
The equipment 10. one kind is cooked, which is characterized in that the equipment of cooking includes the cookware described in claim 9;
Preferably, the equipment of cooking is frying pan, frying pan, air fryer, baking machine, bread producing machine, electric cooker, electric pressure cooking saucepan or beans Pulp grinder.
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