CN117483215A - Method for coating inner part of measuring cavity by ultraviolet fluorescence method - Google Patents
Method for coating inner part of measuring cavity by ultraviolet fluorescence method Download PDFInfo
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- CN117483215A CN117483215A CN202311424523.4A CN202311424523A CN117483215A CN 117483215 A CN117483215 A CN 117483215A CN 202311424523 A CN202311424523 A CN 202311424523A CN 117483215 A CN117483215 A CN 117483215A
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- coating
- measuring cavity
- inner part
- cavity
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- 239000011248 coating agent Substances 0.000 title claims abstract description 64
- 238000000576 coating method Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002795 fluorescence method Methods 0.000 title description 3
- 239000000839 emulsion Substances 0.000 claims abstract description 26
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 18
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 18
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 16
- 238000001917 fluorescence detection Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 10
- 239000003960 organic solvent Substances 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 239000002904 solvent Substances 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 238000004381 surface treatment Methods 0.000 claims abstract description 8
- 230000001680 brushing effect Effects 0.000 claims abstract description 3
- 239000004519 grease Substances 0.000 claims description 14
- 229910000838 Al alloy Inorganic materials 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 7
- QUAMTGJKVDWJEQ-UHFFFAOYSA-N octabenzone Chemical compound OC1=CC(OCCCCCCCC)=CC=C1C(=O)C1=CC=CC=C1 QUAMTGJKVDWJEQ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- ZXDDPOHVAMWLBH-UHFFFAOYSA-N 2,4-Dihydroxybenzophenone Chemical compound OC1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 ZXDDPOHVAMWLBH-UHFFFAOYSA-N 0.000 claims description 3
- MCPKSFINULVDNX-UHFFFAOYSA-N drometrizole Chemical compound CC1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 MCPKSFINULVDNX-UHFFFAOYSA-N 0.000 claims description 3
- DXGLGDHPHMLXJC-UHFFFAOYSA-N oxybenzone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1 DXGLGDHPHMLXJC-UHFFFAOYSA-N 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 2
- 150000001565 benzotriazoles Chemical class 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000002844 melting Methods 0.000 abstract description 7
- 230000008018 melting Effects 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 5
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000004809 Teflon Substances 0.000 description 4
- 229920006362 Teflon® Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007888 film coating Substances 0.000 description 3
- 238000009501 film coating Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000005281 excited state Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- B05D3/002—Pretreatement
-
- 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
-
- 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
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- 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
- B05D7/22—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 to internal surfaces, e.g. of tubes
-
- 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]
-
- 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
- B05D2602/00—Organic fillers
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a method for coating an inner part of a measuring cavity for ultraviolet fluorescence detection, which comprises the following steps: the first step: preparing a measuring cavity; and a second step of: cleaning the measuring cavity; and a third step of: preparing a coating, and adding an organic solvent for absorbing wavelength into polytetrafluoroethylene emulsion; fourth step: spraying or brushing the mixed emulsion on the inner surface of the measuring cavity, putting the sprayed or brushed measuring cavity into a baking oven for baking until the solvent is completely volatilized, and forming a coating; fifth step: sintering at high temperature, sintering in a baking oven at 380-420 ℃, melting the coating material, and forming a net structure with the bonding auxiliary agent; sixth step: and (5) rough surface treatment. The invention is used for inhibiting and absorbing stray light in the cavity, absorbing light with specific wavelength by using chemical substances in the coating, reducing the intensity of non-signal light, thereby reducing background signals, improving the detection limit and detection sensitivity of the whole instrument, and simultaneously the coating film has high temperature resistance, corrosion resistance and adsorption resistance.
Description
Technical Field
The invention particularly relates to a method for coating an inner part of a measuring cavity by ultraviolet fluorescence.
Background
Typically SO 2 The measuring cavity used by the instrument can be plated with a layer of black substance in the cavity, so that the effect of inhibiting and absorbing stray light to a certain extent is achieved. The technical scheme is that a layer of black Teflon material is plated on an aluminum alloy, the inner surface of a measuring cavity sprayed by Teflon coating is relatively smooth, specular reflection is easy to generate, light source signal light can enter a detector, the surface of the blackened aluminum alloy has certain roughness, light entering the cavity generates diffuse reflection, and stray light can also be generated.
The other is that the aluminum alloy material is oxidized and blackened, and the specific treatment method is as follows: the anodic oxidation is carried out on aluminum in sulfuric acid electrolyte under the action of current, so that a thin layer of about 10 microns of oxide film is formed on the surface of the aluminum, and then dyeing treatment is carried out by using dyeing liquid prepared from black organic dye.
Use of Teflon coating treated cavities and oxidized blackening treated measurement cavities in SO 2 On an analyzer, SO is detected 2 Signal intensity at zero gas concentration, i.e. background signal of stray light.
When the light source emits 214nm excitation light to irradiate the interior of the measuring cavity, the photodetector detects the light signal reflected by the inner surface of the measuring cavity irradiated by the light source, and the signal is called as a background noise signal, and is free of SO 2 When the gas enters the measuring cavity, the detected background noise signal intensity is equivalent to the fluorescence signal intensity radiated by excited SO2 gas with the concentration of 200-300 ppb, and the fluctuation range of the background noise signal amplitude is about 10 percent (20 ppb-30 ppb) of the signal intensity, thereby the signal intensity is measured in SO 2 The measurement of the concentration of the gas interferes with the measurement of the emitted fluorescent signal. In advanceTrace or ultra trace SO 2 When the concentration is measured, the real fluorescent signal is often submerged in the background noise signal, SO that SO of 10ppb or less can not be stably measured 2 Fluorescence signal of gas concentration. Cavities treated with teflon coating alone or with oxidative blackening do not meet SO on the ppb level 2 And detecting a gas concentration signal.
Disclosure of Invention
The invention aims to provide a method for coating an inner part of a measuring cavity by ultraviolet fluorescence.
The aim of the invention is achieved by the following technical scheme:
a method for coating an inner part of a measuring cavity for ultraviolet fluorescence detection, comprising the following steps:
the first step: preparing a measuring cavity;
and a second step of: cleaning the measuring cavity;
and a third step of: preparing a coating, and adding an organic solvent for absorbing wavelength into polytetrafluoroethylene emulsion;
fourth step: spraying or brushing the mixed emulsion on the inner surface of the measuring cavity, repeatedly coating and drying according to the requirement until the required thickness is reached, putting the sprayed or brushed measuring cavity into a drying oven for drying until the solvent is completely volatilized, and forming a coating;
fifth step: sintering at high temperature, sintering in a baking oven at 380-420 ℃, melting the coating material, and forming a net structure with the bonding auxiliary agent;
sixth step: rough surface treatment reduces specular reflection.
Further, in a first step, a measuring cavity of the aluminum alloy is manufactured by machining.
Further, in the second step, the grease in the measuring cavity is dissolved by using an organic solvent, then the temperature is increased by 400 ℃ to volatilize the grease, and the bonding capability of the coating and the surface layer of the measuring cavity is improved by using an adhesive additive.
Preferably, in the third step, 0.5 to 1.5% of yellow powder of 2-hydroxy-4-n-octoxybenzophenone is added into the polytetrafluoroethylene emulsion, so that the ultraviolet rays with the wavelength of 240 to 340nm can be absorbed strongly.
Preferably, in the third step, 0.5 to 1.5% of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole is added to the polytetrafluoroethylene emulsion, so that light with a wavelength of 270 to 380nm can be strongly absorbed.
Preferably, in the third step, 0.5 to 1.5% of 2, 4-dihydroxybenzophenone is added to the polytetrafluoroethylene emulsion, so that the light with the wavelength of 280 to 340nm can be strongly absorbed.
Preferably, in the third step, 0.5 to 1.5% of 2-hydroxy-4-methoxybenzophenone is added into polytetrafluoroethylene emulsion, so that light with the wavelength of 280 to 340nm can be absorbed strongly.
Preferably, in the third step, 0.5 to 1.5% of 2- (2 ' -hydroxy-3 ',5' -di-t-phenyl) -5-chlorobenzotriazole is added to the polytetrafluoroethylene emulsion, so that light with the wavelength of 270 to 380nm can be absorbed strongly.
Preferably, in the fourth step, the drying temperature is 75-85 ℃.
Further, in the fifth step, sintering is carried out in an oven at 350-450 ℃, and after the coating material is melted, a net structure is formed by the coating material and the bonding auxiliary agent.
The beneficial technical effects are as follows:
the invention is used for inhibiting and absorbing stray light in the cavity, absorbing light with specific wavelength by using chemical substances in the coating, reducing the intensity of non-signal light, thereby reducing background signal, improving the detection limit and detection sensitivity of the whole instrument, and simultaneously, the coating has the characteristics of high temperature resistance, corrosion resistance, adsorption resistance and the like, is favorable for being used under various severe working conditions.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a graph showing the effect of the coating layer of the measuring cavity according to example 1 of the present invention.
FIG. 2 is a graph showing the detection result of the background signal in example 1 of the present invention.
FIG. 3 is the SO in example 1 of the present invention 2 And (3) a graph of the detection result of the gas low concentration condition.
FIG. 4 is a flow chart of a method of the present invention for coating the interior of a measurement chamber for UV fluorescence detection.
Detailed Description
The ultraviolet fluorescence method is a fluorescence measurement technology which uses the fact that certain substances are in an excited state after being irradiated by ultraviolet light, excited state molecules undergo a collision and emission de-excitation process, the characteristics of the substances can be reflected, and the detection sensitivity is limited by the stray light intensity in a fluorescence measurement cavity. Stray light is generated by reflection of light from the light source through the optical element and the inner surface of the measurement cavity.
The film coating of the invention is mainly applied to ultraviolet fluorescence SO 2 An analyzer using a zinc lamp light source with a center wavelength of 214nm as excitation light, SO 2 The fluorescence wavelength generated by the molecules under the laser is around 330 nm. The film coating in the cavity mainly inhibits and reduces the stray light formed by the light source, and the wavelength range of the stray light to be inhibited in the process is 210 nm-300 nm. Fig. 1 shows the effect of the invention after coating the film.
Then, SO is used as 2 The analyzer illustrates the invention.
Example 1
Referring to fig. 4, a method for coating the interior of a measurement chamber for ultraviolet fluorescence detection, comprising the steps of:
the first step: manufacturing a reaction cavity of the aluminum alloy through machining;
and a second step of: cleaning a reaction cavity, dissolving grease in an organic solvent, volatilizing the grease at a high temperature of 400 ℃, and improving the bonding capability of a coating and the surface layer of the measurement cavity by using an adhesive auxiliary agent;
and a third step of: preparing a coating, namely adding 1% of 2-hydroxy-4-n-octoxybenzophenone yellow powder into polytetrafluoroethylene emulsion, and strongly absorbing ultraviolet rays with the wavelength of 240-340 nm;
fourth step: spraying the mixed emulsion on the inner surface of a measuring cavity, putting the sprayed measuring cavity into a baking oven for baking until the solvent is completely volatilized to form a coating, wherein the baking temperature is 80 ℃;
fifth step: sintering at high temperature, sintering in a baking oven at 400 ℃, melting the coating material, and forming a net structure with the bonding auxiliary agent;
sixth step: rough surface treatment reduces specular reflection.
Referring to FIG. 2, S1 is a reaction chamber for oxidizing and blackening an aluminum alloy material in the background art, S2 is a reaction chamber subjected to the treatment of the embodiment, and SO with the same concentration is introduced into the reaction chamber 2 The indication of the instrument after the gas, the concentration on the graph is that of the introduced SO 2 From the graph, the curve of S2 represents the detection of SO 2 The meter reading, i.e., the background signal at zero gas concentration, is less than 10ppb with a noise of about 2ppb.
Referring to FIG. 3, in SO 2 Under the condition of low concentration of gas, [ SO ] 2 ]The x-axis represents time of operation under this condition, which is still clearly distinguishable =5 ppb.
Therefore, after the film coating provided by the invention is used, stray light is obviously reduced, the background signal of the instrument is obviously reduced, and a signal with lower concentration can be detected.
Meanwhile, the working temperature of the reaction cavity is set to be 45 ℃, and the observation shows that the coating of the reaction cavity has no influence, thus the invention has the advantages of applicability to the temperature and SO resistance 2 And (3) corroding.
Example 2
A method for coating an inner part of a measuring cavity for ultraviolet fluorescence detection, comprising the following steps:
the first step: preparing a measuring cavity, and manufacturing the measuring cavity of the aluminum alloy through machining;
and a second step of: cleaning a measuring cavity, dissolving grease in an organic solvent, volatilizing the grease at a high temperature of 380 ℃, and improving the bonding capability of a coating and the surface layer of the measuring cavity by using an adhesive additive;
and a third step of: preparing a coating, namely adding 0.5% of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole into polytetrafluoroethylene emulsion, so that light with the wavelength of 270-380 nm can be strongly absorbed;
fourth step: spraying the mixed emulsion on the inner surface of a measuring cavity, putting the sprayed measuring cavity into a baking oven for baking until the solvent is completely volatilized to form a coating, wherein the baking temperature is 75 ℃;
fifth step: sintering at high temperature, sintering in a baking oven at 350 ℃, melting the coating material, and forming a net structure with the bonding auxiliary agent;
sixth step: rough surface treatment reduces specular reflection.
Example 3
The first step: preparing a measuring cavity, and manufacturing the measuring cavity of the aluminum alloy through machining;
and a second step of: cleaning a measuring cavity, dissolving grease in an organic solvent, volatilizing the grease at a high temperature of 420 ℃, and improving the bonding capability of a coating and the surface layer of the measuring cavity by using an adhesive additive;
and a third step of: preparing a coating, namely adding 1.5% of 2, 4-dihydroxybenzophenone into polytetrafluoroethylene emulsion, and strongly absorbing light with the wavelength of 280-340 nm;
fourth step: spraying the mixed emulsion on the inner surface of a measuring cavity, putting the sprayed measuring cavity into a baking oven for baking until the solvent is completely volatilized to form a coating, wherein the baking temperature is 85 ℃;
fifth step: sintering at high temperature, sintering in an oven at 450 ℃, melting the coating material, and forming a net structure with the bonding auxiliary agent;
sixth step: rough surface treatment reduces specular reflection.
Example 4
A method for coating an inner part of a measuring cavity for ultraviolet fluorescence detection, comprising the following steps:
the first step: preparing a measuring cavity, and manufacturing the measuring cavity of the aluminum alloy through machining;
and a second step of: cleaning a measuring cavity, dissolving grease in an organic solvent, volatilizing the grease at a high temperature of 400 ℃, and improving the bonding capability of a coating and the surface layer of the measuring cavity by using an adhesive additive;
and a third step of: preparing a coating, namely adding 1% of 2-hydroxy-4-methoxybenzophenone into polytetrafluoroethylene emulsion, and strongly absorbing light with the wavelength of 280-340 nm;
fourth step: spraying the mixed emulsion on the inner surface of a measuring cavity, putting the sprayed measuring cavity into a baking oven for baking until the solvent is completely volatilized to form a coating, wherein the baking temperature is 80 ℃;
fifth step: sintering at high temperature, sintering in a baking oven at 400 ℃, melting the coating material, and forming a net structure with the bonding auxiliary agent;
sixth step: rough surface treatment reduces specular reflection.
Example 5
A method for coating an inner part of a measuring cavity for ultraviolet fluorescence detection, comprising the following steps:
the first step: preparing a measuring cavity, and manufacturing the measuring cavity of the aluminum alloy through machining;
and a second step of: cleaning a measuring cavity, dissolving grease in an organic solvent, volatilizing the grease at a high temperature of 400 ℃, and improving the bonding capability of a coating and the surface layer of the measuring cavity by using an adhesive additive;
and a third step of: preparing a coating, namely adding 1% of 2- (2 ' -hydroxy-3 ',5' -di-tertiary phenyl) -5-chloridized benzotriazole into polytetrafluoroethylene emulsion, so as to strongly absorb light with the wavelength of 270-380 nm;
fourth step: spraying the mixed emulsion on the inner surface of a measuring cavity, putting the sprayed measuring cavity into a baking oven for baking until the solvent is completely volatilized to form a coating, wherein the baking temperature is 80 ℃;
fifth step: sintering at high temperature, sintering in a baking oven at 400 ℃, melting the coating material, and forming a net structure with the bonding auxiliary agent;
sixth step: rough surface treatment reduces specular reflection.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A method for coating an inner part of a measuring cavity for ultraviolet fluorescence detection, comprising the following steps:
the first step: preparing a measuring cavity;
and a second step of: cleaning the measuring cavity;
and a third step of: preparing a coating, and adding an organic solvent for absorbing wavelength into polytetrafluoroethylene emulsion;
fourth step: spraying or brushing the mixed emulsion on the inner surface of the measuring cavity, putting the sprayed or brushed measuring cavity into a baking oven for baking until the solvent is completely volatilized, and forming a coating;
fifth step: sintering at high temperature;
sixth step: and (5) rough surface treatment.
2. The method of claim 1, wherein in the first step, the measuring chamber of the aluminum alloy is produced by machining.
3. The method for coating the inner part of a measuring cavity for ultraviolet fluorescence detection according to claim 1, wherein in the second step, the grease of the measuring cavity is dissolved by using an organic solvent, then the grease is volatilized by increasing the temperature to 380-420 ℃, and the bonding capability of the coating to the surface layer of the measuring cavity is improved by using an adhesive auxiliary agent.
4. The method for coating the inner part of a measuring cavity for ultraviolet fluorescence detection according to claim 1, wherein in the third step, 0.5-1.5% of 2-hydroxy-4-n-octoxybenzophenone yellow powder is added into polytetrafluoroethylene emulsion to absorb ultraviolet rays with the wavelength of 240-340 nm.
5. The method for coating the inner part of a measuring cavity for ultraviolet fluorescence detection according to claim 1, wherein in the third step, 0.5-1.5% of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole is added into polytetrafluoroethylene emulsion to absorb light with a wavelength of 270-380 nm.
6. The method for coating the inner part of a measuring cavity for ultraviolet fluorescence detection according to claim 1, wherein in the third step, 0.5-1.5% of 2, 4-dihydroxybenzophenone is added into polytetrafluoroethylene emulsion to absorb light with a wavelength of 280-340 nm.
7. The method for coating the inner part of a measuring cavity for ultraviolet fluorescence detection according to claim 1, wherein in the third step, 0.5-1.5% of 2-hydroxy-4-methoxybenzophenone is added into polytetrafluoroethylene emulsion to absorb light with a wavelength of 280-340 nm.
8. The method for coating the inner part of a measuring cavity for ultraviolet fluorescence detection according to claim 1, wherein in the third step, 0.5-1.5% of 2- (2 ' -hydroxy-3 ',5' -di-tertiary phenyl) -5-chlorinated benzotriazole is added into polytetrafluoroethylene emulsion to absorb light with a wavelength of 270-380 nm.
9. The method for coating the inner part of a measuring chamber for ultraviolet fluorescence detection according to claim 1, wherein in the fourth step, the drying temperature is 75-85 ℃.
10. The method of claim 1, wherein in the fifth step, the coating is sintered in an oven at 350-450 ℃ and after the coating material is melted, the coating and the bonding aid form a network structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311424523.4A CN117483215A (en) | 2023-10-30 | 2023-10-30 | Method for coating inner part of measuring cavity by ultraviolet fluorescence method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311424523.4A CN117483215A (en) | 2023-10-30 | 2023-10-30 | Method for coating inner part of measuring cavity by ultraviolet fluorescence method |
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| Publication Number | Publication Date |
|---|---|
| CN117483215A true CN117483215A (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311424523.4A Pending CN117483215A (en) | 2023-10-30 | 2023-10-30 | Method for coating inner part of measuring cavity by ultraviolet fluorescence method |
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| Country | Link |
|---|---|
| CN (1) | CN117483215A (en) |
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2023
- 2023-10-30 CN CN202311424523.4A patent/CN117483215A/en active Pending
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