CN111299112A - Method for coating film on surface of microwave shielding module of microwave digestion instrument temperature detector - Google Patents
Method for coating film on surface of microwave shielding module of microwave digestion instrument temperature detector Download PDFInfo
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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
- B05D7/14—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 metal, e.g. car bodies
-
- 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
- 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
- B05D3/10—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 other chemical means
- B05D3/102—Pretreatment of metallic substrates
-
- 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
- B05D3/12—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 mechanical means
-
- 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
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/584—No clear coat specified at least some layers being let to dry, at least partially, before applying the next layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING 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
- C23C—COATING 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
Abstract
The invention discloses a method for coating a film on the surface of a microwave shielding module of a temperature detector of a microwave digestion instrument, wherein the microwave shielding module is a hollow cylinder, and the cylinder consists of a cylinder body and a cover body; a convex pipe is arranged on the outer side of the bottom of the cylinder body, the top end of the convex pipe is closed and is integrally formed with the cylinder body, and the microwave shielding module is made of 304 stainless steel; the method for coating the microwave shielding module specifically comprises the following steps: after degreasing, derusting, neutralizing, washing, surface conditioning and phosphating treatment are carried out on the microwave shielding module, polytetrafluoroethylene coating is sprayed on the barrel, the cover body and the convex pipe of the microwave shielding module in sequence to serve as primer, then the putty is sprayed on the barrel, the cover body and the convex pipe of the microwave shielding module in sequence, and finally the microwave shielding module with the polytetrafluoroethylene coating coated on the surface is obtained after drying and curing. The method can effectively spray the polytetrafluoroethylene coating on the surface of the microwave shielding module, thereby improving the corrosion resistance and the high temperature resistance of the temperature detector of the microwave digestion instrument.
Description
Technical Field
The invention belongs to the technical field of film coating, and particularly relates to a method for coating a film on the surface of a microwave shielding module of a microwave digestion instrument temperature detector.
Background
Microwave digestion is a sample pretreatment means which is emerging in recent years, has the advantages of high speed, small reagent dosage, difficult contamination of samples, energy conservation and the like, and is widely applied in the fields of biology, geology, metallurgy, coal, medicine, food and the like. The temperature is a key index of the microwave digestion instrument, and the digestion completeness and safety can be influenced by the influence of temperature factors such as microwave heating, overheating phenomenon generated by high pressure, reaction heat release, container heat dissipation effect and the like in the microwave digestion process. If the temperature does not reach the set temperature, the sample can be decomposed incompletely, the pressure in the digestion tank can be too large due to too high temperature, the service life of the digestion tank is influenced, and even the safety problem is caused. However, the real-time detection of the temperature and the temperature field of the sample participating in the thermodynamic reaction is always one of the key technologies and difficulties of the microwave digestion instrument. Because of the particularity of the microwave environment, in order to avoid the occurrence of dangers such as explosion of the tank and the like, the temperature detection of the microwave digestion instrument still mainly stops at the temperature of the tank wall of the microwave digestion tank, and the dynamic temperature field in the microwave digestion tank cannot be detected. Meanwhile, as the microwave digestion is in a high-temperature and high-pressure environment, the temperature sensing device on the market at present cannot work stably and reliably under the environment condition. Further, under the working condition of the microwave digestion device, the environmental parameters in the closed space are as follows: the microwave digestion instrument produced according to the prior art is structurally not suitable for implementing internal detection under the environmental conditions, and has the internal microwave frequency (2450 +/-50) Hz, the temperature (0-170) DEG C and the pressure (0.8-1.1) Mpa, which have more rigorous technical requirements on a temperature sensing device.
Chinese patent 201811025735.4 discloses a wireless microwave digestion instrument temperature field calibration device and a wireless microwave digestion instrument, wherein the wireless microwave digestion instrument temperature field calibration device comprises a temperature acquisition module, a temperature recording and transmission module, a power supply module and a microwave shielding device; the temperature acquisition module and the temperature recording and transmitting module are respectively and electrically connected with the power supply module; the temperature acquisition module is in signal connection with the temperature recording and transmission module; the temperature acquisition module, the temperature recording and transmission module and the power supply module are fixedly sealed in the microwave shielding device. Although this appearance temperature field calibrating device is cleared up to wireless microwave can effectively detect the internal temperature field of microwave appearance jar, but the microwave shielding module is made by 304 stainless steel, and this appearance temperature field calibrating device is cleared up to wireless microwave can be corroded by long-term the use, and simultaneously under the high temperature condition, appearance temperature field calibrating device is cleared up to wireless microwave very easily melts and chaps to can't reach the effect of shielding the microwave, and then make its testing result and microwave clear up the internal actual temperature field of appearance jar and have the deviation.
How to improve the corrosion resistance and the high temperature resistance of a temperature field calibration device of a microwave digestion instrument and prolong the service life of the temperature field calibration device is a technical problem to be solved by technical personnel in the field. Polytetrafluoroethylene has excellent chemical stability, corrosion resistance and high temperature resistance, but it has high lubricating non-tackiness. The existing process for coating polytetrafluoroethylene coating on the surface of 304 stainless steel mostly adopts a coating mode, generally adopts three modes of airless spraying, air spraying and electrostatic spraying, and the three modes are easy to cause the phenomena of foaming, film falling and the like, and particularly how to coat the polytetrafluoroethylene on the surface of a microwave shielding module of a microwave digestion instrument temperature field calibration device with a small volume is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, the present invention aims to provide a method for effectively coating polytetrafluoroethylene on the surface of a microwave shielding module so as to improve the corrosion resistance and high temperature resistance of the microwave shielding module.
The method for coating the surface of a microwave shielding module of a temperature detector of a microwave digestion instrument comprises the following steps that the microwave shielding module is a hollow cylinder, and the cylinder consists of a cylinder body and a cover body; a convex pipe is arranged on the outer side of the bottom of the cylinder body, the top end of the convex pipe is closed and is integrally formed with the cylinder body, and the microwave shielding module is made of 304 stainless steel; the method for coating the microwave shielding module specifically comprises the following steps:
(1) pretreatment: sequentially carrying out degreasing, derusting, neutralizing and washing on the microwave shielding module;
(2) surface conditioning and phosphorization: after the microwave shielding module after pretreatment is subjected to surface conditioning treatment by adopting a surface conditioner, removing surface moisture after twice water washing, then carrying out phosphating treatment by adopting PC21 phosphating solution, and finally washing twice and drying;
(3) spraying a primer: shielding the convex pipe part of the microwave shielding module processed in the step (2), placing the microwave shielding module in a paint spraying device, spraying polytetrafluoroethylene paint on the surfaces of the barrel body and the cover body, and setting spraying parameters: the thickness of the coating film is 15-25 mu m, the viscosity of the coating film is 25-30 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 35cm, then the microwave shielding module is taken out and dried at low temperature, the barrel body and the cover body are shielded, then the microwave shielding module is placed in a paint spraying device, polytetrafluoroethylene paint is sprayed on the surface of the convex tube, and the spraying parameters are set: the thickness of the coating is 4-8 μm, the viscosity of the coating is 25-30 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 35 cm; finally, taking out the microwave shielding module and drying at a low temperature;
(4) putty scraping: mixing the atomic ash main agent and the curing agent in a mass ratio of 50: 1.5-2.5 to obtain putty, coating the putty on the microwave shielding module treated in the step (3), and then drying, polishing, cleaning and drying water;
(5) spraying finish paint: shielding the convex pipe part of the microwave shielding module treated in the step (4), placing the microwave shielding module in a paint spraying device, spraying polytetrafluoroethylene paint on the surfaces of the barrel body and the cover body, and setting spraying parameters: the thickness of a coating film is 22-24 mu m, the fineness of the coating film is less than or equal to 9 mu m, the viscosity of the coating film is 21-29 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 51cm, then the microwave shielding module D is taken out and dried at low temperature, the barrel body and the cover body are shielded, then the microwave shielding module is placed in a paint spraying device, and polytetrafluoroethylene paint is sprayed on the surface: the thickness of the coating is 8-12 mu m, the fineness of the coating is less than or equal to 9 mu m, the viscosity of the coating is 21-29 mPa.s, the surface drying time is less than or equal to 9min, the full drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 51 cm; finally, taking out the microwave shielding module and drying at a low temperature;
(6) and (3) post-treatment: and drying and curing the microwave shielding module to obtain the microwave shielding module with the polytetrafluoroethylene coating coated on the surface.
Further, in the step (1), pre-scrubbing and hot water washing are carried out before degreasing, wherein the water temperature of water adopted in hot water washing is 50 +/-5 ℃, the water washing time is 1min, and the pressure difference of a filter is less than or equal to 0.05 MPa.
Further, when degreasing in the step (1), firstly adding degreasing liquid into a degreasing tank, heating to 55-65 ℃, and then placing the microwave shielding module into the degreasing liquid for degreasing for 3 min.
Further, the degreasing fluid is a heavy oil pollution cleaning agent with a standard of ZJ-822B.
Further, during neutralization in the step (1), the microwave shielding module is placed in a neutralization solution at 25-30 ℃ for neutralization for 1.5 min.
Further, in the step (2), the surface conditioner adopted is LP-306 manganese surface conditioner.
Further, during the phosphating treatment in the step (2), the total acidity of the phosphating solution is 50-59, and the free acid is 4.1-5.8; the phosphating temperature is 61-69 ℃, the treatment time is 4-8 min, so that the concentration of ferrous ions in the microwave shielding module is 0.4-2.1 g/L.
Further, in the step (4), when the microwave shielding module is polished, water sand paper with the model number of 600# is soaked in water for polishing or soapy water for polishing.
Further, the drying and curing in the step (6) comprises two steps of drying and curing, wherein the drying is carried out at the temperature of 140 ℃ for 30 min; wherein the curing step comprises three steps of surface drying at 140 deg.C for 24 hr, semi-drying at 80 deg.C for 12 hr, and completely drying at 30 deg.C for 9 hr.
Further, the barrel comprises a bottom barrel and a middle pipe, first threads are arranged on the outer surfaces of the upper end and the lower end of the middle pipe, second threads connected with the upper end of the middle pipe in a matched mode are arranged on the inner surface of the cover body, third threads connected with the lower end of the middle pipe in a matched mode are arranged on the outer surface of the upper end of the bottom barrel, and the cover body and the bottom barrel are detachably connected with the middle pipe through the threads respectively.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention improves the adhesive force of the polytetrafluoroethylene coating on the surface of the microwave shielding module through surface adjustment and coagulation treatment, and simultaneously solves the problem of coating the polytetrafluoroethylene coating on a workpiece with small volume by controlling the thickness and viscosity of a coating film.
2. According to the microwave digestion instrument temperature detector, the polytetrafluoroethylene coating is sprayed on the surface of the microwave shielding module twice, so that the polytetrafluoroethylene with an extremely low friction coefficient is effectively coated on the microwave shielding module while the microwave shielding module is not damaged, the corrosion resistance and the high temperature resistance of the microwave shielding module are improved, the corrosion resistance and the high temperature resistance of the microwave digestion instrument temperature detector are further improved, and the service life of the microwave digestion instrument temperature detector is prolonged.
3. The friction coefficient of the polytetrafluoroethylene is extremely low, so that the microwave shielding module sprayed with the polytetrafluoroethylene is extremely easy to clean, the cleaning state can be kept for a long time, the attachment of fine attached crops on the surface of the microwave shielding module is reduced, and the detection accuracy of the temperature detector of the microwave digestion instrument is further ensured.
4. Compared with 304 stainless steel, the microwave shielding device coated with polytetrafluoroethylene has the advantages that the heat dissipation is fast, and after the temperature detector is taken out after the detection is finished, the temperature detector can be rapidly cooled, so that the protection effect on workers is realized, and the working efficiency is improved.
Drawings
Fig. 1-schematic structural view of a microwave shielding module.
Fig. 2-schematic structural diagram of the microwave shielding module after spraying polytetrafluoroethylene coating.
Wherein: 1-a cylinder body; 2-a cover body; 3-a convex pipe; 4-polytetrafluoroethylene coating.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, a method for coating a film on the surface of a microwave shielding module of a temperature detector of a microwave digestion instrument, wherein the microwave shielding module is a hollow cylinder, and the cylinder consists of a cylinder body 1 and a cover body 2; a convex tube 3 is arranged on the outer side of the bottom of the cylinder body 1, the top end of the convex tube 3 is closed and is integrally formed with the cylinder body 1, and the microwave shielding module is made of 304 stainless steel; the method for coating the microwave shielding module specifically comprises the following steps:
(1) pretreatment: sequentially carrying out degreasing, derusting, neutralizing and washing on the microwave shielding module;
(2) surface conditioning and phosphorization: after the microwave shielding module after pretreatment is subjected to surface conditioning treatment by adopting a surface conditioner, removing surface moisture after twice water washing, then carrying out phosphating treatment by adopting PC21 phosphating solution, and finally washing twice and drying;
(3) spraying a primer: shielding the convex pipe part of the microwave shielding module processed in the step (2), placing the microwave shielding module in a paint spraying device, spraying polytetrafluoroethylene paint on the surfaces of the barrel body and the cover body, and setting spraying parameters: the thickness of the coating film is 15-25 mu m, the viscosity of the coating film is 25-30 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 35cm, then the microwave shielding module is taken out and dried at low temperature, the barrel body and the cover body are shielded, then the microwave shielding module is placed in a paint spraying device, polytetrafluoroethylene paint is sprayed on the surface of the convex tube, and the spraying parameters are set: the thickness of the coating is 4-8 μm, the viscosity of the coating is 25-30 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 35 cm; finally, taking out the microwave shielding module and drying at a low temperature;
(4) putty scraping: mixing the atomic ash main agent and the curing agent in a mass ratio of 50: 1.5-2.5 to obtain putty, coating the putty on the microwave shielding module treated in the step (3), and then drying, polishing, cleaning and drying water;
(5) spraying finish paint: shielding the convex pipe part of the microwave shielding module treated in the step (4), placing the microwave shielding module in a paint spraying device, spraying polytetrafluoroethylene paint on the surfaces of the barrel body and the cover body, and setting spraying parameters: the thickness of a coating film is 22-24 mu m, the fineness of the coating film is less than or equal to 9 mu m, the viscosity of the coating film is 21-29 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 51cm, then the microwave shielding module is taken out and dried at low temperature, the barrel body and the cover body are shielded, then the microwave shielding module is placed in a paint spraying device, and polytetrafluoroethylene paint is sprayed on the surface: the thickness of the coating is 8-12 mu m, the fineness of the coating is less than or equal to 9 mu m, the viscosity of the coating is 21-29 mPa.s, the surface drying time is less than or equal to 9min, the full drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 51 cm; finally, taking out the microwave shielding module and drying at a low temperature;
(6) and (3) post-treatment: and drying and curing the microwave shielding module to obtain the microwave shielding module with the polytetrafluoroethylene coating coated on the surface.
After each spraying, the microwave shielding module needs to be placed in a low-temperature drying tunnel (less than or equal to 39 ℃) for a certain time to ensure the full volatilization of the organic solvent in the paint and the effective leveling of the paint, for example, when primer is sprayed, after the polytetrafluoroethylene paint is sprayed on the surfaces of the cylinder body and the cover body, the microwave shielding module needs to be placed in the low-temperature drying tunnel for a certain time, and then the polytetrafluoroethylene paint is sprayed on the surface of the convex pipe.
After the polytetrafluoroethylene coating is sprayed on the surface of the microwave shielding module, the polytetrafluoroethylene has the characteristics of excellent chemical stability, corrosion resistance and sealing property and high temperature resistance, so that the microwave shielding module has good corrosion resistance and high temperature resistance. In addition, polytetrafluoroethylene's coefficient of friction is low, is changeed the washing than 304 stainless steel, simultaneously with 304 stainless steel than the heat dissipation fast, after the detection, take out thermodetector and can rapid cooling like this, it is easier to wash simultaneously, has further improved the corrosion resistance of microwave shielding module.
Simultaneously for more accurate temperature to in the microwave digestion appearance detects, the polytetrafluoroethylene thickness of the protruding pipe surface spraying that corresponds at temperature probe is obviously less than the thickness of barrel and lid, and like this, the thickness of barrel and lid coating polytetrafluoroethylene is relatively thicker, can guarantee like this to change the washing in the cleaning process.
The multiple spraying mode is mainly used for ensuring that the paint is completely dried, avoiding the occurrence of foaming phenomenon and preventing the paint from falling off due to the reasons of incomplete drying and the like. The two-time spraying is because the thickness of the coating is small according to the small and exquisite equipment, and the problem of multiple spraying cost is considered, so the best spraying effect can be achieved by comprehensively considering the two-time spraying.
In the specific implementation, in the step (1), pre-scrubbing and hot water washing are carried out before degreasing, wherein the water temperature of water adopted in hot water washing is 50 +/-5 ℃, the water washing time is 1min, and the pressure difference of a filter is less than or equal to 0.05 MPa.
The pre-scrubbing can scrub dust and the like on the surface of the microwave shielding module completely, the hot water washing can clean pollutants in oil stains on the surface, and meanwhile, the deformation of the microwave shielding module caused by overlarge washing pressure is avoided by controlling the hot water spraying pressure.
When the degreasing in the step (1) is carried out, firstly, degreasing liquid is added into a degreasing tank, the temperature is raised to 55-65 ℃, then, the microwave shielding module is placed in the degreasing liquid for degreasing, and the degreasing time is 3 min.
The oil content of the degreasing liquid in the degreasing tank after degreasing is less than or equal to 5g/L, so that the grease on the surface of the microwave shielding module is removed.
In specific implementation, the degreasing fluid is a heavy oil pollution cleaning agent of a stop-limit brand, and the model of the degreasing fluid is ZJ-822B.
The pH value of the product is more than 7, so that the surface of the microwave shielding module is alkaline.
In the specific implementation, during the neutralization in the step (1), the microwave shielding module is placed in a neutralization solution at the temperature of 25-30 ℃ for neutralization for 1.5 min.
Because metal parts are easily affected by water and oxygen in the production and transportation process and have the problem of rusting and corrosion, the rust on the surface needs to be removed before spraying, the rust removing method selects acid materials such as sulfuric acid, hydrochloric acid and the like to prepare a chemical rust remover, and the surface of the microwave shielding module after degreasing and rust removing is possibly alkaline and also possibly acidic, so the surface of the microwave shielding module needs to be neutralized, and the surface of the microwave shielding module is neutral, so that the adhesion of the polytetrafluoroethylene coating on the surface of the microwave shielding module is favorably improved. The neutral paint is in a stable state and does not react with acid and alkali in contact, so that the paint is neutral and is a normal coating standard.
In the specific implementation, the surface conditioner adopted in the step (2) is an LP-306 manganese surface conditioner.
In the specific implementation, during the phosphating treatment in the step (2), the total acidity of the phosphating solution is 50-59, and the free acid is 4.1-5.8; the phosphating temperature is 61-69 ℃, the treatment time is 4-8 min, so that the concentration of ferrous ions in the microwave shielding module is 0.4-2.1 g/L.
After the surface conditioning treatment is carried out by using the surface conditioner, a compact manganese phosphate coating can be generated by the surface conditioner, so that the effect of improving the compactness of the phosphating coating is achieved, and the service life of the phosphating solution is prolonged. The surface conditioning is mainly to treat chemical substances remained on the metal surface due to the oil and rust removing process, so that the phosphating effect is better after the treatment. Fe in the phosphating solution2+Is used to assist the anodic reaction, and is usually pretreated with a certain amount of ferrous ions or with a clean iron plate before the bath is put into operation. However, in the continuous process of the reaction, the further generation of the phosphating film is hindered along with the increase of the content of the ferrous ions, and experiments prove that the concentration of the ferrous ions needs to be controlled within the range of 0.4-2.1 g/L, the reaction is insufficient due to the low concentration of the ferrous ions, and the phenomenon of excessive reaction can occur due to the high concentration of the ferrous ions, so that the ferrous ion phosphating agent in the range is preferably selected for 304 stainless steel, and the ferrous ions in the selected PC21 phosphating solution are in the range.
When the method is specifically implemented, in the step (4), when the microwave shielding module is polished, water sand paper with the model number of 600# is soaked in water for polishing or soapy water for polishing.
After polishing, finish paint can be sprayed only after a wet-grinding layer is completely dried, otherwise, the surface of the microwave shielding module is whitened.
In specific implementation, the drying and curing in the step (6) comprises two steps of drying and curing, wherein the drying is carried out at the temperature of 140 ℃ for 30 min; wherein the curing step comprises three steps of surface drying at 140 deg.C for 24 hr, semi-drying at 80 deg.C for 12 hr, and completely drying at 30 deg.C for 9 hr.
Here, the stoving curing has a key influence on the surface quality, adhesion and colour of the paint film. The drying degree of the paint film can directly influence the painting effect, the undried paint film can generate foaming, falling and the like at high temperature, and the temperature detector of the microwave digestion instrument is equipment for detecting at high temperature, so the drying effect is very important.
When the novel multifunctional screw cap is specifically implemented, the barrel body is composed of a bottom barrel and a middle pipe, first threads are arranged on the outer surfaces of the upper end and the lower end of the middle pipe, second threads connected with the upper end of the middle pipe in a matched mode are arranged on the inner surface of the cap body, third threads connected with the lower end of the middle pipe in a matched mode are arranged on the outer surface of the upper end of the bottom barrel, and the cap body and the bottom barrel are detachably connected with the middle.
The cylinder body is divided into two parts, and the temperature detector is relatively small in size and is easier to mount by adopting split charging.
The schematic structural diagram of the microwave shielding module obtained by spraying the polytetrafluoroethylene coating on the surface of the microwave shielding module by adopting the method is shown in fig. 2, wherein 4 is the polytetrafluoroethylene coating, and the thickness of the polytetrafluoroethylene coating on the surfaces of the cylinder body, the cover body and the convex pipe is not distinguished in the drawing because the polytetrafluoroethylene coating sprayed on the surface of the microwave shielding module is thinner. Then the cover body is unscrewed, the temperature acquisition module, the temperature recording and transmission module, the power supply module and the like are installed in the microwave shielding module, and the cover body is screwed down.
Example 1
(1) Pretreatment: firstly, pre-cleaning a microwave shielding module, and then cleaning for 1min by using hot water at 55 ℃, wherein the pressure difference of a filter is less than or equal to 0.05 MPa; then adding degreasing liquid of a stop brand heavy oil stain cleaning agent, namely ZJ-822B, into a degreasing tank, heating to 55 ℃, and then placing a microwave shielding module into the degreasing liquid for degreasing for 3 min; then, derusting is carried out after primary washing and secondary washing, and then, after tertiary washing, the microwave shielding module is placed in neutralization solution at 30 ℃ for neutralization for 1.5 min; then washing with water for the fourth time;
(2) surface conditioning and phosphorization: performing surface adjustment on the microwave shielding module by adopting an LP-306 manganese surface adjusting agent, performing primary water washing, secondary water washing and water blowing, and then performing phosphating treatment on the microwave shielding module by adopting a PC21 phosphating solution, wherein during phosphating treatment, the total acidity of the phosphating solution is 50 and the free acid is 4.1; phosphating temperature is 65 ℃, treating time is 8min, and finally washing twice and drying are carried out;
(3) spraying a primer: sheltering from the protruding pipe part with the newspaper, arrange the microwave shielding module in paint spraying apparatus and at barrel and lid surface spraying polytetrafluoroethylene coating, set up the spraying parameter: the thickness of a coating film is 25 mu m, the viscosity of the coating film is 30mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 35cm, then the microwave shielding module is taken out and dried in a drying tunnel at 38 ℃, the barrel body and the cover body are shielded by newspaper, then the microwave shielding module B is placed in a paint spraying device, polytetrafluoroethylene paint is sprayed on the surface of a convex pipe, and the spraying parameters are set: the thickness of the coating film is 8 mu m, the viscosity of the coating film is 30mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 35 cm; finally, taking out the microwave shielding module and drying in a drying tunnel at 38 ℃;
(4) putty scraping: mixing an atomic ash main agent and a curing agent in a mass ratio of 50: 1.5-2.5 to obtain putty, coating the putty on a microwave shielding module, and then drying, polishing, cleaning and drying;
(5) shelter from protruding pipe part, arrange the microwave shielding module in paint spraying apparatus and at barrel and lid surface spraying polytetrafluoroethylene coating, set up the spraying parameter: the thickness of a coating film is 22 mu m, the fineness of the coating film is less than or equal to 9 mu m, the viscosity of the coating film is 21 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 51cm, then the microwave shielding module D is taken out and dried in a drying tunnel at 38 ℃, the barrel body and the cover body are shielded, then the microwave shielding module D is placed in a paint spraying device to spray polytetrafluoroethylene paint on the surface of a convex pipe, and: the thickness of the coating is 12 mu m, the fineness of the coating is less than or equal to 9 mu m, the viscosity of the coating is 21 mPa.s, the surface drying time is less than or equal to 9min, the full drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 51 cm; finally, taking out the microwave shielding module and drying in a drying tunnel at 38 ℃;
(6) and (3) post-treatment: baking the microwave shielding module at 140 ℃ for 30 min; then, curing was performed, which was divided into three steps of surface drying at 140 ℃ for 24 hours, semi-drying at 80 ℃ for 12 hours, and complete drying at 30 ℃ for 9 hours, to obtain a microwave shielding module coated with a teflon coating on the surface.
After the experiment is finished, the adhesion force of the coated microwave shielding module is tested in the modes of alcohol wiping, ultrasonic washing and the like, and the coating is not affected at all, so that the fact that the coating covers the metal surface layer and a compact polytetrafluoroethylene protective layer is formed can be proved.
Example 2
(1) Pretreatment: firstly, pre-cleaning a microwave shielding module, and then cleaning for 1min by using hot water at 50 ℃, wherein the pressure difference of a filter is less than or equal to 0.05 MPa; then adding degreasing liquid of a stop brand heavy oil stain cleaning agent, namely ZJ-822B, into a degreasing tank, heating to 55 ℃, and then placing a microwave shielding module into the degreasing liquid for degreasing for 3 min; then, derusting is carried out after primary washing and secondary washing, and then, after tertiary washing, the microwave shielding module is placed in neutralization solution at 30 ℃ for neutralization for 1.5 min; then washing with water for the fourth time;
(2) surface conditioning and phosphorization: performing surface adjustment on the microwave shielding module by adopting an LP-306 manganese surface adjusting agent, performing primary water washing, secondary water washing and water blowing, and then performing phosphating treatment on the microwave shielding module by adopting a PC21 phosphating solution, wherein during phosphating treatment, the total acidity of the phosphating solution is 59, and the free acid is 5.8; phosphating temperature is 69 ℃, treating time is 5min, and finally washing twice and drying are carried out;
(3) spraying a primer: sheltering from the protruding pipe part with the newspaper, arrange the microwave shielding module in paint spraying apparatus and at barrel and lid surface spraying polytetrafluoroethylene coating, set up the spraying parameter: the thickness of a coating film is 15 mu m, the viscosity of the coating film is 25mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 35cm, then the microwave shielding module is taken out and dried in a drying tunnel at 35 ℃, the barrel body and the cover body are shielded by newspaper, then the microwave shielding module B is placed in a paint spraying device, polytetrafluoroethylene paint is sprayed on the surface of a convex pipe, and the spraying parameters are set: the thickness of the coating is 12 mu m, the viscosity of the coating is 25mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 35 cm; finally, taking out the microwave shielding module and drying in a drying tunnel at 37 ℃;
(4) putty scraping: mixing an atomic ash main agent and a curing agent in a mass ratio of 50: 1.5-2.5 to obtain putty, coating the putty on a microwave shielding module, and then drying, polishing, cleaning and drying;
(5) shelter from protruding pipe part, arrange the microwave shielding module in paint spraying apparatus and at barrel and lid surface spraying polytetrafluoroethylene coating, set up the spraying parameter: the thickness of a coating film is 24 micrometers, the fineness of the coating film is less than or equal to 9 micrometers, the viscosity of the coating film is 29 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 51cm, then the microwave shielding module D is taken out and dried in a drying tunnel at 38 ℃, the barrel body and the cover body are shielded, then the microwave shielding module D is placed in a paint spraying device, polytetrafluoroethylene paint is sprayed on the surface of a convex pipe, and spraying: the thickness of the coating is 8 mu m, the fineness of the coating is less than or equal to 9 mu m, the viscosity of the coating is 29 mPa.s, the surface drying time is less than or equal to 9min, the full drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 51 cm; finally, taking out the microwave shielding module and drying in a drying tunnel at 32 ℃;
(6) and (3) post-treatment: baking the microwave shielding module at 140 ℃ for 30 min; then, curing was performed, which was divided into three steps of surface drying at 140 ℃ for 24 hours, semi-drying at 80 ℃ for 12 hours, and complete drying at 30 ℃ for 9 hours, to obtain a microwave shielding module coated with a teflon coating on the surface.
Assembling a microwave digestion instrument temperature detector: and unscrewing a plurality of cover bodies of the microwave shielding modules coated with the polytetrafluoroethylene coatings obtained in the embodiments 1 and 2, then installing the temperature acquisition module, the temperature recording and transmission module, the power supply module and the like in the microwave shielding modules, and screwing the cover bodies, thereby forming the microwave digestion instrument temperature detector. Then the temperature field of the same microwave digestion instrument is detected by a microwave digestion instrument detector of a microwave shielding module which is not coated with a polytetrafluoroethylene coating, the temperature of the device is overhigh after the device is used by the coating and the device which is not coated with the coating in a trial run when the microwave digestion instrument is put into the microwave digestion instrument and is adjusted to be 100 ℃, but the device which is not coated with the coating can be touched by hands after being cooled for ten minutes, and the device which is coated with the coating can be touched by hands after 7 minutes, thereby greatly reducing the cooling time after high temperature. And repeating the process at 100 ℃ in a clean environment at only high temperature. The reaction time is 30 minutes each time, the reaction time is 30 minutes after the reaction time is cooled to the room temperature, the temperature data and the surface condition of two devices are repeatedly recorded for 100 times, the test result is obtained, the deviation of the temperature measured value of the coated device after 100 times of tests is within the range of +/-0.2, and the deviation of the uncoated device from the beginning to the last is within the range of +/-0.5, so that the coated device is more resistant to high temperature and better in stability than the uncoated device in a high-temperature environment. Then two completely new coatings are placed on one of the two uncoated devices, one uncoated device is placed at room temperature, the uncoated device is taken out after 72 hours in a solution containing weak hydrochloric acid, the surface of the coated device is intact, black corroded spots can be seen on the uncoated device surface, and therefore the coating has a corrosion resistance effect and can effectively protect the metal shell from being influenced by chemical reagents.
Finally, it should be noted that the above-mentioned examples of the present invention are only examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Variations and modifications in other variations will occur to those skilled in the art upon reading the foregoing description. Not all embodiments are exhaustive. All obvious changes and modifications of the present invention are within the scope of the present invention.
Claims (10)
1. The method for coating the surface of a microwave shielding module of a temperature detector of a microwave digestion instrument comprises the following steps that the microwave shielding module is a hollow cylinder, and the cylinder consists of a cylinder body and a cover body; a convex pipe is arranged on the outer side of the bottom of the cylinder body, the top end of the convex pipe is closed and is integrally formed with the cylinder body, and the microwave shielding module is made of 304 stainless steel; the method is characterized in that the microwave shielding module is coated, and the method specifically comprises the following steps:
(1) pretreatment: sequentially carrying out degreasing, derusting, neutralizing and washing on the microwave shielding module;
(2) surface conditioning and phosphorization: after the microwave shielding module after pretreatment is subjected to surface conditioning treatment by adopting a surface conditioner, removing surface moisture after twice water washing, then carrying out phosphating treatment by adopting PC21 phosphating solution, and finally washing twice and drying;
(3) spraying a primer: shielding the convex pipe part of the microwave shielding module processed in the step (2), placing the microwave shielding module in a paint spraying device, spraying polytetrafluoroethylene paint on the surfaces of the barrel body and the cover body, and setting spraying parameters: the thickness of the coating film is 15-25 mu m, the viscosity of the coating film is 25-30 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 35cm, then the microwave shielding module is taken out and dried at low temperature, the barrel body and the cover body are shielded, then the microwave shielding module is placed in a paint spraying device, polytetrafluoroethylene paint is sprayed on the surface of the convex tube, and the spraying parameters are set: the thickness of the coating is 4-8 μm, the viscosity of the coating is 25-30 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 35 cm; finally, taking out the microwave shielding module and drying at a low temperature;
(4) putty scraping: mixing the atomic ash main agent and the curing agent in a mass ratio of 50: 1.5-2.5 to obtain putty, coating the putty on the microwave shielding module treated in the step (3), and then drying, polishing, cleaning and drying water;
(5) spraying finish paint: shielding the convex pipe part of the microwave shielding module treated in the step (4), placing the microwave shielding module in a paint spraying device, spraying polytetrafluoroethylene paint on the surfaces of the barrel body and the cover body, and setting spraying parameters: the thickness of a coating film is 22-24 mu m, the fineness of the coating film is less than or equal to 9 mu m, the viscosity of the coating film is 21-29 mPa.s, the surface drying time is less than or equal to 9min, the actual drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is greater than or equal to 51cm, then the microwave shielding module D is taken out and dried at low temperature, the barrel body and the cover body are shielded, then the microwave shielding module is placed in a paint spraying device, and polytetrafluoroethylene paint is sprayed on the surface: the thickness of the coating is 8-12 mu m, the fineness of the coating is less than or equal to 9 mu m, the viscosity of the coating is 21-29 mPa.s, the surface drying time is less than or equal to 9min, the full drying time is less than or equal to 24h, the flexibility is less than or equal to 0.9mm, and the impact toughness is more than or equal to 51 cm; finally, taking out the microwave shielding module and drying at a low temperature;
(6) and (3) post-treatment: and drying and curing the microwave shielding module to obtain the microwave shielding module with the polytetrafluoroethylene coating coated on the surface.
2. The method for coating the surface of the microwave shielding module of the temperature detector of the microwave digestion instrument as claimed in claim 1, wherein in the step (1), the degreasing is performed by pre-scrubbing and hot water washing, the water temperature of the water adopted in the hot water washing is 50 +/-5 ℃, the water washing time is 1min, and the differential pressure of the filter is less than or equal to 0.05 MPa.
3. The method for coating the surface of the microwave shielding module of the microwave digestion instrument temperature detector is characterized in that in the degreasing step (1), degreasing liquid is firstly added into a degreasing tank, the temperature is raised to 55-65 ℃, then the microwave shielding module is placed in the degreasing liquid for degreasing, and the degreasing time is 3 min.
4. The method for coating the surface of the microwave shielding module of the microwave digestion instrument temperature detector is characterized in that the degreasing fluid is an environment-friendly heavy oil stain cleaning agent with the model ZJ-822B.
5. The method for coating the surface of the microwave shielding module of the microwave digestion instrument temperature detector is characterized in that in the neutralization in the step (1), the microwave shielding module is placed in a neutralization solution at 25-30 ℃ for neutralization for 1.5 min.
6. The method for coating the surface of the microwave shielding module of the microwave digestion instrument temperature detector is characterized in that in the step (2), the adopted surface conditioner is LP-306 manganese series surface conditioner.
7. The method for coating the surface of the microwave shielding module of the microwave digestion instrument temperature detector is characterized in that during the phosphating treatment in the step (2), the total acidity of the phosphating solution is 50-59, and the free acid is 4.1-5.8; the phosphating temperature is 61-69 ℃, the treatment time is 4-8 min, so that the concentration of ferrous ions in the microwave shielding module is 0.4-2.1 g/L.
8. The method for coating the surface of the microwave shielding module of the microwave digestion instrument temperature detector is characterized in that in the step (4), when the microwave shielding module is polished, water sand paper with the model number of 600# is used for soaking and polishing or soapy water is used for polishing.
9. The method for coating the surface of the microwave shielding module of the microwave digestion instrument temperature detector is characterized in that the drying and curing in the step (6) comprises two steps of drying and curing, wherein the drying is carried out at the temperature of 140 ℃ for 30 min; wherein the curing step comprises three steps of surface drying at 140 deg.C for 24 hr, semi-drying at 80 deg.C for 12 hr, and completely drying at 30 deg.C for 9 hr.
10. The method for coating the surface of the microwave shielding module of the temperature detector of the microwave digestion instrument as claimed in claim 1, wherein the barrel body is composed of a bottom barrel and a middle pipe, first threads are arranged on the outer surfaces of the upper end and the lower end of the middle pipe, second threads matched and connected with the upper end of the middle pipe are arranged on the inner surface of the cover body, third threads matched and connected with the lower end of the middle pipe are arranged on the outer surface of the upper end of the bottom barrel, and the cover body and the bottom barrel are detachably connected with the middle pipe through threads respectively.
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