CN108912936A - A kind of modified polyether ether ketone water based paint and preparation method thereof - Google Patents
A kind of modified polyether ether ketone water based paint and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D161/00—Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
- C09D161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09D161/16—Condensation polymers of aldehydes or ketones with phenols only of ketones with phenols
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The present invention discloses a kind of modified polyether ether ketone water based paint and preparation method thereof, is prepared by weight by following components：Polyether-ether-ketone resin 20-30%, solid lubricant 2-10%, solvent 20-35%, adhesion promoter 0.5-5%, aqueous dispersion 0.1-0.3%, aqueous defoamer 0.1-0.3%, surplus are deionized water.Water based paint of the invention is modified by the way that polyether-ether-ketone powder is added solid lubricant, then dispersion liquid is made, and being formed has the excellent self-lubricating coating for reducing coefficient of friction, increasing wear-resistant strength；Modified polyether ether ketone water based paint prepared by the present invention has excellent high temperature resistant, antifriction, wear-resisting property, long service life, it is a kind of environmental protection, the water paint that has a wide range of application, compared with traditional polyether-ether-ketone powder electrostatic coating, have the characteristics that stock utilization is high, easy for construction, performance is more excellent.
Description
Technical field
The invention belongs to technical field of polymer composite materials, and in particular to a kind of modified polyether ether ketone water based paint and its
Preparation method.
Background technique
Polyether-ether-ketone (PEEK) resin is a kind of high performance aromatic series semi-crystalline thermoplastic special engineering plastics, fusing point
334 DEG C, 168 DEG C of softening point, 132~148MPa of tensile strength.Due to containing a large amount of phenyl ring and ketone group on its main chain, so that poly-
Closing object has the performances such as excellent physics, chemistry, mechanics, heat, and can be formed with the processing method of traditional thermoplastic,
Matrix as high-performance composite materials is used widely in engineering.PEEK is rigidly larger, and dimensionally stable is preferable, and line is swollen
Swollen coefficient is smaller, and PEEK chemistry thermal stability is good, has strong corrosion resistance to acid, alkali and almost all of organic solvent,
Itself has anti-flammability simultaneously, discharges cigarette under flame condition and toxic gas is few, capability of resistance to radiation is strong.PEEK material has prominent
Tribological property out, resistance to skimming wear and fretting wear resistance property are excellent, can especially keep high resistance under 250 DEG C of high temperature
Mill property and low coefficient of friction.
Polyether-ether-ketone processing and forming is mainly electrostatic powder spraying, injection molding and extrusion molding at present, but these methods
Material and equipment, technique there are certain requirements, wherein electrostatic spraying can not obtain the polyethers ether of very thin thickness in metal surface
Ketone coating has limitation, and external advanced developed country has now been developed aqueous polyether-ether-ketone dispersive paint, but price is high
It is expensive, it is domestic relatively slow to the research of polyether-ether-ketone liquid coating and application development, therefore develop a water base painting of modified polyether ether ketone
Material is of great significance, and can widen the performance and its application field of polyetheretherketonematerials materials, also comply with the demand for development of coating industry.
Summary of the invention
It is an object of the invention to overcome defect of the existing technology, provide a kind of easy for construction, spraying effect uniformly,
Aqueous, environmental protective, the modified polyether ether ketone water based paint haveing excellent performance and preparation method thereof.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of modified polyether ether ketone water based paint is prepared by weight by following components：
Further scheme, the polyether-ether-ketone resin are mixed by 10-14 μm, 16-22 μm of partial size polyether-ether-ketone resin,
And its weight ratio is 1:9-9:1, preferably 2:5-5:2.
The first polyether-ether-ketone resin partial size is 10-14 μm, and second of polyether-ether-ketone resin partial size is 16-22 μm；When
When PEEK resin partial size is too big, PEEK resin melting is not thorough, and coating roughness is too big, and coating is rough, when PEEK partial size too
Hour, small particle processing difficulties, cost is very high, and being easy levelling causes coating layer thickness excessively thin.
Further scheme, the solid lubricant are graphite, molybdenum disulfide, polytetrafluoroethylene (PTFE), at least two in calcirm-fluoride
Kind, partial size is not more than 20 μm.
Further scheme, the solvent are made of dimethyl ether with selected from least one of ethyl alcohol, isopropanol；
Dimethyl ether boiling point is higher, excellent solubility property, aqueous, environmental protective, to people's safety with higher；Ethyl alcohol and different
Propyl alcohol boiling point is lower, it is easy to volatilize, the levelability that can be effectively improved coating is mixed with high boiling solvent.
Further scheme, the adhesion promoter are polyvinyl alcohol, polyethylene glycol, hydroxypropyl methyl cellulose, epoxy
Any one in base silane.
Polyether-ether-ketone
Polyether-ether-ketone (PEEK) resin is a kind of special engineering plastics haveing excellent performance.PEEK resin not only heat resistance than it
His high-temperature resistance plastice is excellent, and has high intensity, high-modulus, high-fracture toughness and excellent dimensional stability；PEEK tree
Rouge bending strength and compressive strength at 250 DEG C still have 12~13MPa；The rigidity of PEEK resin is larger, and dimensional stability is preferable,
Linear expansion coefficient is smaller；With excellent chemical resistance, in common chemicals, only the concentrated sulfuric acid can be dissolved or be broken
It is gone bad, its corrosion resistance is close with nickel steel；The good toughness of PEEK resin, the excellent fatigue durability to alternate stress are all modelings
It is most outstanding in material, it can match in excellence or beauty with alloy material；PEEK resin has tribological property outstanding, resistance to skimming wear and fine motion mill
Damage is had excellent performance, and high wearability and low coefficient of friction can be especially kept at 250 DEG C；In addition, PEEK also has from profit
The excellent properties such as slip is good, easy processing, insulating properties stabilization, hydrolysis so that its aerospace, automobile manufacture, it is electric,
The fields such as medical treatment and food processing have a wide range of applications.
Adhesion promoter
The polymer of adhesive effect is formed a film and had when adhesion promoter component of the present invention is melted by heating
Composition, makes PEEK resin good can be bonded in metal surface before melting, and under 380-400 DEG C of high temperature, PEEK resin is molten
Melt completion, which decomposes completely or remain on a small quantity but do not influence coating property.In addition, one kind as paint development becomes
Gesture, environment protecting water-based paint is to continue to develop, so using water as primary solvent, as the preferred of inventive formulation system.
Another goal of the invention of the invention is to provide the preparation method of above-mentioned modified polyether ether ketone water based paint, including with
Lower step：
(1) polyether-ether-ketone resin and solid lubricant are added in powder blender according to the ratio, under 1500r/min revolving speed
5min is mixed, uniform powder mixture is obtained；
(2) by step (1) powder mixture and solvent, deionized water, adhesion promoter, aqueous dispersion, aqueous disappear
Infusion mixing is placed in dispersion machine, is stirred 1h under 2000r/min revolving speed, is obtained mixed solution；
(3) step (2) mixed solution is transferred in colloid mill, 240-300s is ground under 3000r/min revolving speed and is made equal
Even stable modified polyether ether ketone water based paint.
Compared with prior art, the present invention has beneficial effect below：
(1) present invention is added aqueous point by several solvent collective effects such as dimethyl ether, ethyl alcohol, isopropanols
Powder substantially increases the concentration of polyether-ether-ketone resin in a solvent, solves polyethers by the method for " first dispersing to grind again "
Dispersion of the ether ketone resin in water paint and stable problem, have expanded polyetheretherketonematerials materials in the application of paint field.
(2) be added in modified polyether ether ketone water borne coating formulation of the invention graphite, the solid lubricants such as molybdenum disulfide into
Row is modified, and the coefficient of friction of material is greatly reduced while playing polyether-ether-ketone good abrasion resistance.
(3) modified polyether ether ketone water based paint of the invention has the performances such as excellent high temperature resistant, antifriction, wear-resisting, uses
Service life is long, is a kind of environmental protection, the water paint that has a wide range of application.
Detailed description of the invention
Fig. 1 is for testing coating friction and wear behavior testing machine schematic illustration of the invention.
The reference numerals are as follows：
1- oil box；Sample under 2-；The upper sample of 3-.
Specific embodiment
Present invention is further described in detail in the following with reference to the drawings and specific embodiments.
All raw materials are commercially available in the present invention.
Aqueous dispersion is Germany BYK-190.
Aqueous defoamer is Germany BYK-024.
Embodiment 1
A kind of modified polyether ether ketone water based paint, each component content is as follows in the coating：Polyether-ether-ketone resin 24% is consolidated
Body lubricant 5%, solvent 30%, adhesion promoter 2%, aqueous dispersion 0.2%, aqueous defoamer 0.1%, deionized water
Surplus.
It is polyethers that the polyether-ether-ketone resin of two kinds of different-grain diameters, which accounts for the mass percent of coating, in above-mentioned polyether-ether-ketone resin
Ether ketone (10-14um) 16%, polyether-ether-ketone (16-22um) 8%.Each component and the quality hundred of coating is accounted in above-mentioned solid lubricant
Divide than being graphite 1%, molybdenum disulfide 4%.In above-mentioned solvent each component and account for coating mass percent be dipropylene glycol diformazan
Ether 10%, ethyl alcohol 10%, isopropanol 10%.Above-mentioned adhesion promoter is the polyvinyl alcohol water solution that mass fraction is 5%.
A kind of preparation method of above-mentioned modified polyether ether ketone water based paint, includes the following steps：
(1) it is added in powder blender after polyether-ether-ketone resin and solid lubricant being weighed by a certain percentage,
It is mixed 5 minutes under 1500r/min revolving speed, obtains uniform powder mixture；
(2) formula composition for pressing raw material, by powder mixture and solvent, deionized water, adhesion promoter, aqueous dispersion
Agent, aqueous defoamer mixing are placed in dispersion machine, are stirred 1h under 2000r/min revolving speed, are obtained mixed solution；
(3) mixed solution is transferred in colloid mill, in the case where revolving speed is 3000r/min, grinding 240-300s is made uniform and stable
Modified polyether ether ketone water based paint.
Embodiment 2
A kind of modified polyether ether ketone water based paint, each component content is as follows in the coating：Polyether-ether-ketone resin 30% is consolidated
Body lubricant 8%, solvent 35%, adhesion promoter 0.5%, aqueous dispersion 0.3%, aqueous defoamer 0.2%, deionization
Water surplus.
It is polyethers that the polyether-ether-ketone resin of two kinds of different-grain diameters, which accounts for the mass percent of coating, in above-mentioned polyether-ether-ketone resin
Ether ketone (10-14um) 12%, polyether-ether-ketone (16-22um) 18%.Each component and the quality of coating is accounted in above-mentioned solid lubricant
Percentage is graphite 2%, molybdenum disulfide 3%, polytetrafluoroethylene (PTFE) 3%.Each component and the quality percentage of coating is accounted in above-mentioned solvent
Than for dimethyl ether 25%, isopropanol 10%.Above-mentioned adhesion promoter is the hydroxypropyl first that mass fraction is 10%
Base cellulose aqueous solution.
The preparation method is the same as that of Example 1 for a kind of above-mentioned modified polyether ether ketone water based paint.
Embodiment 3
A kind of modified polyether ether ketone water based paint, each component content is as follows in the coating：Polyether-ether-ketone resin 20% is consolidated
Body lubricant 10%, solvent 20%, adhesion promoter 5%, aqueous dispersion 0.1%, aqueous defoamer 0.1%, deionization
Water surplus.
It is polyethers that the polyether-ether-ketone resin of two kinds of different-grain diameters, which accounts for the mass percent of coating, in above-mentioned polyether-ether-ketone resin
Ether ketone (10-14um) 14%, polyether-ether-ketone (16-22um) 6%.Each component and the quality hundred of coating is accounted in above-mentioned solid lubricant
Divide than being graphite 4%, molybdenum disulfide 2%, calcirm-fluoride 4%.In above-mentioned solvent each component and account for coating mass percent be two
Propylene Glycol Dimethyl Ether 10%, ethyl alcohol 5%, isopropanol 5%.Above-mentioned adhesion promoter is epoxy radicals silicone hydride.
The preparation method is the same as that of Example 1 for a kind of above-mentioned modified polyether ether ketone water based paint.
Embodiment 4
A kind of modified polyether ether ketone water based paint, each component content is as follows in the coating：Polyether-ether-ketone resin 26% is consolidated
Body lubricant 2%, solvent 28%, adhesion promoter 4%, aqueous dispersion 0.1%, aqueous defoamer 0.3%, deionized water
Surplus.
It is polyethers that the polyether-ether-ketone resin of two kinds of different-grain diameters, which accounts for the mass percent of coating, in above-mentioned polyether-ether-ketone resin
Ether ketone (10-14um) 22%, polyether-ether-ketone (16-22um) 4%.Each component and the quality hundred of coating is accounted in above-mentioned solid lubricant
Divide than being graphite 2%, polytetrafluoroethylene (PTFE) 4%, calcirm-fluoride 2%.It each component and accounts for the mass percent of coating in above-mentioned solvent and is
Dimethyl ether 10%, ethyl alcohol 3%, isopropanol 15%.Above-mentioned adhesion promoter is the poly- second that mass fraction is 20%
Two alcohol solutions.
The preparation method is the same as that of Example 1 for a kind of above-mentioned modified polyether ether ketone water based paint.
Modified polyether ether ketone water based paint obtained by embodiment 1-4 is tested for the property, testing result such as 1 institute of table
Show：
Table 1
Experimental method
Experimental method of the present invention is that 38mm × 38mm × 1.5mmA3 steel plate is carried out blasting treatment using 60 mesh ores in sand form, will
It prepares coating and surface of steel plate is sprayed on using spraying method, drying sinters the coating of 0.02-0.03mm thickness into baking oven, uses
Tribology research institute of HeFei University of Technology end face frictional wear tester is tested, using upper sample 3 (annulus, outer diameterInternal diameter) rotation, the static end face contact slide friction type of lower sample 2 (coating template), glossy
Under the conditions of sliding and oil-free lubrication, detection can be carried out to the friction and abrasion of sample, be oil box 1 below lower sample 2.The test present invention
Coating friction and wear behavior testing machine schematic illustration it is as shown in Figure 1.
Instrument
Upper sample：45# steel annulus, outer diameterInternal diameter40-45HRC, roughness Ra 0.4；
Lower sample：38mm × 38mm × 1.5mmA3 steel plate, surface coatings, thickness 0.02-0.03mm；
Experiment condition
Oil lubrication, N32 machinery oil, 0.6m/s linear velocity, multistage loadings, first section load are 4Mpa, running-in 5min, two sections of loads
Lotus 8MPa, running-in 10min, every 10min loads a 4Mpa later, and alarm temperature is arranged 180 DEG C, alarm friction torque setting
10Nm。
Dry friction, 0.6m/s linear velocity, multistage loadings, first section load are 2Mpa, running-in 5min, two sections of load 4MPa, are run
10min is closed, every 10min loads a 2Mpa later, and alarm temperature is arranged 180 DEG C, and 10Nm is arranged in alarm friction torque.
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to case study on implementation, and described herein one
As principle be applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to implementation cases here
Example, those skilled in the art's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be
Within protection scope of the present invention.
Claims (6)
1. a kind of modified polyether ether ketone water based paint, which is characterized in that be prepared by weight by following components：
Polyether-ether-ketone resin 20-30%
Solid lubricant 2-10%
Solvent 20-35%
Adhesion promoter 0.5-5%
Aqueous dispersion 0.1-0.3%
Aqueous defoamer 0.1-0.3%
Deionized water surplus.
2. modified polyether ether ketone water based paint according to claim 1, which is characterized in that the polyether-ether-ketone resin by
10-14 μm, 16-22 μm of partial size polyether-ether-ketone resin mix, and its weight ratio be 1:9-9:1, preferably 2:5-5:2.
3. modified polyether ether ketone water based paint according to claim 1, which is characterized in that the solid lubricant is stone
Ink, molybdenum disulfide, polytetrafluoroethylene (PTFE), at least two compositions in calcirm-fluoride.
4. modified polyether ether ketone water based paint according to claim 1, which is characterized in that the solvent is by dipropylene glycol two
Methyl ether is formed with selected from least one of ethyl alcohol, isopropanol.
5. modified polyether ether ketone water based paint according to claim 1, which is characterized in that the adhesion promoter is poly-
Vinyl alcohol, polyethylene glycol, hydroxypropyl methyl cellulose, any one in epoxy radicals silicone hydride.
6. a kind of method for preparing modified polyether ether ketone water based paint as described in any one in claim 1-5, which is characterized in that
Include the following steps：
（1）Polyether-ether-ketone resin and solid lubricant are added in powder blender according to the ratio, mixed under 1500r/min revolving speed
5min obtains uniform powder mixture；
（2）By step（1）Powder mixture and solvent, deionized water, adhesion promoter, aqueous dispersion, aqueous defoamer
Mixing is placed in dispersion machine, is stirred 1h under 2000r/min revolving speed, is obtained mixed solution；
（3）By step（2）Mixed solution is transferred in colloid mill, and 240-300s is ground under 3000r/min revolving speed and is made uniformly steady
Fixed modified polyether ether ketone water based paint.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113457480A (en) * | 2021-07-14 | 2021-10-01 | 上海枫满新材料科技有限公司 | Preparation method of ultrafine powder water-based slurry |
| CN113980545A (en) * | 2021-10-29 | 2022-01-28 | 西安建筑科技大学 | Polyether-ether-ketone/black-phosphorus self-lubricating composite coating, composite material and preparation method of composite material |
| CN114805895A (en) * | 2022-05-05 | 2022-07-29 | 江苏谢氏陆禧科技股份有限公司 | PVC decorative film and preparation process thereof |
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Application publication date: 20181130 |