CN111760777A - Polytetrafluoroethylene coating process for bottom spraying - Google Patents
Polytetrafluoroethylene coating process for bottom spraying Download PDFInfo
- Publication number
- CN111760777A CN111760777A CN202010527250.6A CN202010527250A CN111760777A CN 111760777 A CN111760777 A CN 111760777A CN 202010527250 A CN202010527250 A CN 202010527250A CN 111760777 A CN111760777 A CN 111760777A
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- CN
- China
- Prior art keywords
- polytetrafluoroethylene
- coating
- bottom spraying
- coating process
- spraying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
- B05D7/26—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials synthetic lacquers or varnishes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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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
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2301/00—Inorganic additives or organic salts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
- B05D2506/15—Polytetrafluoroethylene [PTFE]
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2231—Oxides; Hydroxides of metals of tin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention discloses a polytetrafluoroethylene coating process for bottom spraying, which comprises the following steps: preparing polytetrafluoroethylene, dispersing nano mica sheets in water according to a certain ratio to form mica sheet suspension, adjusting the pH to 1-3 by using nitric acid, adding anhydrous stannic chloride, heating and stirring to generate light yellow powder, washing and drying, and calcining at 650-750 ℃ for 1-3 hours to obtain a polytetrafluoroethylene material loaded with stannic oxide; according to the polytetrafluoroethylene coating process for bottom spraying, polytetrafluoroethylene is added, fluorocarbon chemical with excellent chemical resistance and high and low temperature resistance is achieved, the fluorocarbon chemical cannot deteriorate even being exposed in air, the polytetrafluoroethylene can be used for a long time within the range of-200 and 250 ℃, and when the polytetrafluoroethylene coating process is used for spraying, a pretreated coated workpiece is higher in corrosion resistance, the processing flow is simple, energy is saved, and the environment is protected.
Description
Technical Field
The invention belongs to the field of coating, and particularly relates to a polytetrafluoroethylene coating process for bottom spraying.
Background
Polytetrafluoroethylene, commonly known as "plastic king", is a polymer made by polymerization of tetrafluoroethylene as a monomer. White wax, translucency, heat resistance and cold resistance are excellent, and the glass can be used for a long time at minus 180-260 ℃. The material has the characteristics of acid resistance, alkali resistance and various organic solvents resistance, and is almost insoluble in all solvents. Meanwhile, the polytetrafluoroethylene has the characteristic of high temperature resistance, has extremely low friction coefficient, can be used for lubricating and becomes an ideal coating for easily cleaning the inner layer of the water pipe;
painting is an important step in modern product manufacturing processes. The quality of antirust and anticorrosive coatings is one of the important aspects of the overall quality of products. The appearance quality of the product not only reflects the protection and decoration performance of the product, but also is an important factor forming the value of the product.
The coating process is a systematic engineering, and comprises three basic procedures of treatment, coating process and drying of the surface of the coated object before coating, a reasonably designed coating system, selection of proper coating, determination of good working environment conditions, important links of quality, process management, technical economy and the like
The traditional coating process is complex in processing flow, and workpieces are easy to corrode after being used for a long time, so that a polytetrafluoroethylene coating process for bottom spraying is provided.
Disclosure of Invention
The invention mainly aims to provide a polytetrafluoroethylene coating process for bottom spraying, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a polytetrafluoroethylene coating process for bottom spraying comprises the following steps:
step one, preparing polytetrafluoroethylene, dispersing nano mica sheets in water according to a certain proportion to form mica sheet suspension, adjusting the pH to 1-3 by using nitric acid, adding anhydrous stannic chloride, heating and stirring to generate light yellow powder, washing and drying, calcining for 1-3 hours at the temperature of 650 plus 750 ℃ to obtain a polytetrafluoroethylene material loaded with stannic oxide, putting the polytetrafluoroethylene material into distilled water according to a certain proportion, stirring for 10-20min, and standing for later use;
and secondly, performing primer pretreatment on the substrate layer of the pretreated coating workpiece, performing electrostatic powder spraying on the pretreated coating workpiece, coating a transparent coating layer on the upper layer of the coating, spraying polytetrafluoroethylene on the surface of the transparent coating layer, and then sequentially drying, curing and polishing to finally finish the coating process of the polytetrafluoroethylene.
Preferably, the mass fraction of mica sheets in the mica sheet suspension is 7-11 wt%, and the mass ratio of the added anhydrous stannic chloride to the mica sheets is 0.3-0.6: 1.
Preferably, the temperature in the curing process is 180-220 ℃, and the curing time is 0.6-1.2 h.
Preferably, the anhydrous tin tetrachloride is a gas having a regular tetrahedral configuration with a bond length of Sn-Cl 228 pm. Melting point-33 deg.C, boiling point 114.1 deg.C, and density 2.226g/cm3It is miscible with carbon tetrachloride, ethanol and benzene, is soluble in water, is soluble in most organic solvents such as gasoline, carbon disulfide and turpentine, and can hydrolyze in humid air to generate stannic acid and hydrogen chloride, which can generate white smoke and is corrosive.
Preferably, the mica powder comprises 43.13-49.04% of SiO2, 27.93-37.44% of Al2O3, 9-11% of K2O + Na2O and 4.13-6.12% of H2O by weight percentage.
Preferably, the concentration of nitric acid is 6 mol/L.
Preferably, the resistivity of the distilled water is more than or equal to 10x104 omega cm.
Compared with the prior art, the invention has the following beneficial effects: according to the polytetrafluoroethylene coating process for bottom spraying, polytetrafluoroethylene is added, fluorocarbon chemical with excellent chemical resistance and high and low temperature resistance is achieved, the fluorocarbon chemical does not deteriorate even when the polytetrafluoroethylene is exposed in air, the polytetrafluoroethylene can be used for a long time within the range of-200 and 250 ℃, and when the polytetrafluoroethylene coating process is used for spraying, a pretreated coating workpiece is enabled to be stronger in corrosion resistance, the processing flow is simple, and energy conservation and environmental protection are achieved.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The polytetrafluoroethylene coating process for bottom spraying comprises the following steps:
step one, preparing polytetrafluoroethylene, dispersing nano mica sheets in water according to a certain proportion to form mica sheet suspension, adjusting the pH to 1-3 by using nitric acid, adding anhydrous stannic chloride, heating and stirring to generate light yellow powder, washing and drying, calcining for 1-3 hours at the temperature of 650 plus 750 ℃ to obtain a polytetrafluoroethylene material loaded with stannic oxide, putting the polytetrafluoroethylene material into distilled water according to a certain proportion, stirring for 10-20min, and standing for later use;
and secondly, performing primer pretreatment on the substrate layer of the pretreated coating workpiece, performing electrostatic powder spraying on the pretreated coating workpiece, coating a transparent coating layer on the upper layer of the coating, spraying polytetrafluoroethylene on the surface of the transparent coating layer, and then sequentially drying, curing and polishing to finally finish the coating process of the polytetrafluoroethylene.
The mass fraction of mica sheets in the mica sheet suspension is 7-11 wt%, and the mass ratio of the added anhydrous stannic chloride to the mica sheets is 0.3-0.6: 1; the temperature in the curing process is 180-220 ℃, and the curing time is 0.6-1.2 h; the anhydrous stannic chloride is gas with a regular tetrahedron configuration and a bond length Sn-Cl 228 pm. Melting point-33 deg.C, boiling point 114.1 deg.C, and density 2.226g/cm3The alcohol soluble organic acid can be mixed with carbon tetrachloride, ethanol and benzene, is easily soluble in water, is dissolved in most organic solvents such as gasoline, carbon disulfide and turpentine, and can hydrolyze to generate stannic acid and hydrogen chloride when meeting humid air, and white smoke and corrosiveness can be generated; the mica powder comprises 43.13-49.04% of SiO2, 27.93-37.44% of Al2O3, 9-11% of K2O + Na2O and 4.13-6.12% of H2O; the concentration of the nitric acid is 6 mol/L; the resistivity of the distilled water is more than or equal to 10x104 omega cm.
Example 1
Dispersing nano mica sheets in water according to a certain ratio to form mica sheet suspension, adjusting the pH to 2 by using nitric acid, adding anhydrous stannic chloride, heating and stirring to generate faint yellow powder, washing and drying, calcining at 650 ℃ for 2 hours to obtain a polytetrafluoroethylene material loaded with stannic oxide, putting the polytetrafluoroethylene material into distilled water according to a certain ratio, stirring for 20min, and standing for later use; the method comprises the steps of performing primer pretreatment on a substrate layer of a pretreated coating workpiece, performing electrostatic powder spraying on the pretreated coating workpiece, coating a transparent coating layer on the coating, spraying polytetrafluoroethylene on the surface of the coating, and then sequentially drying, curing and polishing to finally complete the polytetrafluoroethylene coating process.
By observation, the corrosion resistance of the pretreated coated workpiece is improved by 20 percent by using the spraying method
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The polytetrafluoroethylene coating process for bottom spraying is characterized by comprising the following steps of:
step one, preparing polytetrafluoroethylene, dispersing nano mica sheets in water according to a certain proportion to form mica sheet suspension, adjusting the pH to 1-3 by using nitric acid, adding anhydrous stannic chloride, heating and stirring to generate light yellow powder, washing and drying, calcining for 1-3 hours at the temperature of 650 plus 750 ℃ to obtain a polytetrafluoroethylene material loaded with stannic oxide, putting the polytetrafluoroethylene material into distilled water according to a certain proportion, stirring for 10-20min, and standing for later use;
and secondly, performing primer pretreatment on the substrate layer of the pretreated coating workpiece, performing electrostatic powder spraying on the pretreated coating workpiece, coating a transparent coating layer on the upper layer of the coating, spraying polytetrafluoroethylene on the surface of the transparent coating layer, and then sequentially drying, curing and polishing to finally finish the coating process of the polytetrafluoroethylene.
2. A teflon painting process for bottom spraying according to claim 1, characterized in that: the mass fraction of mica sheets in the mica sheet suspension is 7-11 wt%, and the mass ratio of the added anhydrous stannic chloride to the mica sheets is 0.3-0.6: 1.
3. A teflon painting process for bottom spraying according to claim 1, characterized in that: the temperature in the curing process is 180-220 ℃, and the curing time is 0.6-1.2 h.
4. A teflon painting process for bottom spraying according to claim 1, characterized in that: the anhydrous stannic chloride is gas with a regular tetrahedron configuration and a bond length Sn-Cl 228 pm. Melting point-33 deg.C, boiling point 114.1 deg.C, and density 2.226g/cm3It is miscible with carbon tetrachloride, ethanol and benzene, is soluble in water, is soluble in most organic solvents such as gasoline, carbon disulfide and turpentine, and can hydrolyze in humid air to generate stannic acid and hydrogen chloride, which can generate white smoke and is corrosive.
5. A teflon painting process for bottom spraying according to claim 1, characterized in that: the mica powder comprises 43.13-49.04% of SiO2, 27.93-37.44% of Al2O3, 9-11% of K2O + Na2O and 4.13-6.12% of H2O by weight percentage.
6. A teflon painting process for bottom spraying according to claim 1, characterized in that: the concentration of nitric acid is 6 mol/L.
7. A teflon painting process for bottom spraying according to claim 1, characterized in that: the resistivity of the distilled water is more than or equal to 10x104 omega cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010527250.6A CN111760777A (en) | 2020-06-11 | 2020-06-11 | Polytetrafluoroethylene coating process for bottom spraying |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010527250.6A CN111760777A (en) | 2020-06-11 | 2020-06-11 | Polytetrafluoroethylene coating process for bottom spraying |
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| Publication Number | Publication Date |
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| CN111760777A true CN111760777A (en) | 2020-10-13 |
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| CN202010527250.6A Pending CN111760777A (en) | 2020-06-11 | 2020-06-11 | Polytetrafluoroethylene coating process for bottom spraying |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114950912A (en) * | 2021-12-17 | 2022-08-30 | 黄山创想科技股份有限公司 | Method for spraying scale inhibition winding drum for aluminum-clad steel wire drawing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109749537A (en) * | 2017-11-01 | 2019-05-14 | 中国石油天然气股份有限公司 | Teflon long paint and its application |
-
2020
- 2020-06-11 CN CN202010527250.6A patent/CN111760777A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109749537A (en) * | 2017-11-01 | 2019-05-14 | 中国石油天然气股份有限公司 | Teflon long paint and its application |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114950912A (en) * | 2021-12-17 | 2022-08-30 | 黄山创想科技股份有限公司 | Method for spraying scale inhibition winding drum for aluminum-clad steel wire drawing |
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Application publication date: 20201013 |