CN113755072A - Corrosion-resistant gate valve and machining process thereof - Google Patents
Corrosion-resistant gate valve and machining process thereof Download PDFInfo
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- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- 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
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- 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
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Abstract
The application relates to a corrosion-resistant gate valve and a processing technology thereof, and the corrosion-resistant gate valve comprises a valve body, wherein the surface of the valve body is coated with corrosion-resistant coating and comprises the following components: polytetrafluoroethylene, diaminomaleonitrile, 1, 5-hexadienol, N- (2, 3-epoxypropyl) phthalimide, 1-octene, a catalyst, zinc powder and a solvent; a processing technology of a corrosion-resistant gate valve comprises the steps of preparing corrosion-resistant paint, preprocessing a valve body and coating the valve body with the corrosion-resistant paint. The application has the following advantages and effects: the polytetrafluoroethylene has excellent corrosion resistance; the cyano compound obtained by the reaction of diaminomaleonitrile, 1, 5-hexadiene alcohol and N- (2, 3-epoxypropyl) phthalimide can better improve the adhesive force and the corrosion resistance of the paint; the catalyst catalyzes the ternary polymerization of polytetrafluoroethylene, 1-octene and alkenyl contained in a cyano compound obtained by reaction, which is beneficial to improving the density after film formation, reducing the occurrence of electrochemical corrosion and prolonging the service life of the gate valve.
Description
Technical Field
The application relates to the technical field of gate valves, in particular to a corrosion-resistant gate valve and a machining process thereof.
Background
The gate valve is an opening and closing member gate plate, the movement direction of the gate plate is vertical to the fluid direction, and the gate valve can only be fully opened and fully closed and cannot be adjusted and throttled; the gate valve is sealed by the contact of a valve seat and a gate plate, and usually a sealing surface is subjected to surfacing welding of metal materials to increase the wear resistance, such as surfacing welding of 1Cr13, STL6, stainless steel and the like; the gate plate is divided into a rigid gate plate and an elastic gate plate according to the difference of the gate plate.
The chinese patent publication No. CN109667943A discloses a gate valve, which includes a valve body, a gate installed in the valve body, a valve rod installed above the gate, a valve cover fixed on the valve body, and a driving device driving the valve rod to move up and down.
In view of the above related technologies, the existing gate valve made of carbon steel is susceptible to corrosion caused by the external environment during use, and the service life of the gate valve is affected, so that improvement is still needed.
Disclosure of Invention
In order to improve the corrosion resistance of the gate valve, the application provides a corrosion-resistant gate valve and a machining process thereof.
In a first aspect, the application provides a corrosion-resistant gate valve, which adopts the following technical scheme:
the corrosion-resistant gate valve comprises a valve body, wherein the surface of the valve body is coated with a corrosion-resistant coating, and the corrosion-resistant coating comprises the following components in parts by weight:
30-40 parts of polytetrafluoroethylene;
12-15 parts of diaminomaleonitrile;
4-5 parts of 1, 5-hexadienol;
2-3 parts of N- (2, 3-epoxypropyl) phthalimide;
6-8 parts of 1-octene;
1-2 parts of a catalyst;
6-10 parts of zinc powder;
15-20 parts of solvent.
By adopting the technical scheme, the polytetrafluoroethylene has excellent corrosion resistance; the diaminomaleonitrile, 1, 5-hexadiene alcohol and N- (2, 3-epoxypropyl) phthalimide react to obtain a cyano compound which can better improve the corrosion resistance of the coating and simultaneously introduce more active functional groups, thus being beneficial to better combining with other components such as polytetrafluoroethylene and the like; introducing double-bond-containing 1-octene, catalyzing the ternary polymerization of polytetrafluoroethylene, 1-octene and alkenyl contained in a cyano compound obtained by reaction by a catalyst, and contributing to improving the density after film formation, so that the obtained coating has a more compact structure, and cutting off the electrical connection between the surface of the valve body and a corrosive medium to make the corrosion current close to zero; meanwhile, the penetration of corrosive media is reduced, the resistance of the diffusion of negative ions in the media is increased, and the negative ions in the media are not easy to combine with iron ions of the valve body, so that the occurrence of electrochemical corrosion is reduced, and the corrosion process is slowed down.
Preferably, the corrosion-resistant coating also comprises 3-4 parts of hydrotalcite powder by weight.
By adopting the technical scheme, the hydrotalcite powder with the layered structure is added, the hydrotalcite powder also has a certain adsorption effect, and the ordered layered structure of the hydrotalcite powder adsorbs the zinc powder and is combined with each component of the coating, so that the contact area of the zinc powder and the coating is increased, the ordered structure is integrally formed, the defects and holes of the coating are reduced, the structure is compact and ordered, the compactness and the impermeability of the coating are improved, and the purpose of improving the corrosion resistance effect is achieved.
Preferably, the corrosion-resistant coating also comprises 4-5 parts by weight of 2-butenoic acid.
By adopting the technical scheme, 2-butenoic acid is utilized to carry out functional modification on the hydrotalcite powder, organic functional groups are introduced, the conditions that the hydrotalcite powder is easy to agglomerate and has poor mechanical strength are improved, and anionic anchoring groups such as carboxyl and the like can be adsorbed on the surfaces of the hydrotalcite powder and the zinc powder, so that the compatibility among the hydrotalcite powder, the zinc powder and other components of the coating is improved, and the overall performance of the coating is improved.
Preferably, the solvent is dioctyl phthalate, and the corrosion-resistant coating further comprises 6-8 parts by weight of prenyl polyoxyethylene ether.
By adopting the technical scheme, the integral wettability of the components can be improved by taking dioctyl phthalate as a solvent; meanwhile, the prenol polyoxyethylene ether is further added to generate a synergistic effect with dioctyl phthalate, and the introduced long side chain of the polyoxyethylene ether extends into the coating to form a space barrier, so that high dispersibility and high dispersion retention capacity are realized, the coating can be mixed more uniformly, and a coating with higher durability is obtained after the coating is cured; in addition, the prenyl polyoxyethylene ether can also react with carboxyl adsorbed on the surfaces of the hydrotalcite powder and the zinc powder, so that the blending stability of the hydrotalcite powder, the zinc powder and other organic components is further improved, and the integral performance of the coating is favorably improved.
Preferably, the catalyst is osmium tetroxide.
In a second aspect, the present application provides a process for manufacturing a corrosion-resistant gate valve, which adopts the following technical scheme:
a processing technology of a corrosion-resistant gate valve comprises the following steps:
s1, preparing corrosion-resistant paint; mixing diaminomaleonitrile, 1, 5-hexadienol and N- (2, 3-epoxypropyl) phthalimide, and stirring to react at 30-40 ℃ for 50-60min to obtain a cyano compound;
stirring the mixture of the zinc powder and the solvent at the rotating speed of 200-250r/min for 8-12min to obtain a dispersed zinc solution;
mixing polytetrafluoroethylene with a catalyst, then adding 1-octene and a cyano compound, heating to 70-80 ℃, and stirring for reacting for 2-3 h; finally, adding the dispersed zinc solution, and continuously stirring for 15-20min to obtain the corrosion-resistant coating;
s2, preprocessing a valve body; carrying out sand blasting treatment on the surface of the valve body;
s3, coating the valve body with corrosion-resistant paint; coating the corrosion-resistant coating at room temperature to a coating thickness of 8-10 μm, and drying for 2-3 h.
Preferably, the S1 further includes the following steps:
mixing 12-15 parts of diaminomaleonitrile, 4-5 parts of 1, 5-hexadiene alcohol and 2-3 parts of N- (2, 3-epoxypropyl) phthalimide, and stirring for reacting for 50-60min at 30-40 ℃ to obtain a cyano compound;
mixing 6-10 parts of zinc powder and 15-20 parts of solvent dioctyl phthalate, and stirring at the rotation speed of 200-250r/min for 8-12 min; mixing with 6-8 parts of isopentenol polyoxyethylene ether, and stirring for 5-6 min; then adding 4-5 parts of 2-butenoic acid and 3-4 parts of hydrotalcite powder, and carrying out ultrasonic treatment for 5-8min at the ultrasonic power of 100-120W and the frequency of 20-30kHz to obtain a dispersed mixture;
mixing 30-40 parts of polytetrafluoroethylene and 1-2 parts of catalyst, then adding 6-8 parts of 1-octene and cyano compound, heating to 70-80 ℃, and stirring for reacting for 2-3 hours; and finally, adding the dispersed mixture, and continuously stirring for 15-20min to obtain the corrosion-resistant coating.
Preferably, the S3 further includes the following steps:
primary coating; heating to 50-60 ℃, coating the corrosion-resistant coating on the surface of the valve body, wherein the coating thickness is 1-2 mu m, cooling to room temperature, and drying for 1-2 h;
repeating the coating; coating the corrosion-resistant coating for the second time at room temperature, wherein the coating thickness is 8-10 mu m, and drying for 2-3 h;
curing; coating again to a coating thickness of 2-3 μm, and curing at 15-20 deg.C for 1-2 h.
By adopting the technical scheme, the corrosion-resistant coating is coated and cured by adopting three temperature gradients from high temperature to room temperature and then to low temperature, and the coating is in a fluid state and is coated in a small amount at the high temperature for the first time, so that the coating can be filled in the pores of the valve body, and the surface of the valve body is smoother; the coating is normally coated at room temperature, then a small amount of coating is carried out again, the coating is cured at low temperature, and the next layer is coated after the previous layer is dried, so that the layers are criss-cross, the curing effect and the durability of the coating are improved, and the corrosion resistance is improved.
Preferably, in the step S2, 40-60 mesh quartz sand is used for the sand blasting treatment, and the cleanliness reaches Sa2.5 grade.
By adopting the technical scheme, the surface of the valve body can be subjected to comprehensive sand blasting treatment by adopting 40-60-mesh quartz sand, so that the problem that the adhesive force of coatings at different positions on the valve body is different due to uneven sand blasting treatment is avoided; when the cleanliness reaches Sa2.5 grade, no obvious impurities such as rust, oxide skin and the like exist, the adhesive force of the coating can be effectively improved, and the corrosion-resistant service life is prolonged.
To sum up, the application comprises the following beneficial technical effects:
1. the polytetrafluoroethylene has excellent corrosion resistance; the cyano compound obtained by the reaction of diaminomaleonitrile, 1, 5-hexadiene alcohol and N- (2, 3-epoxypropyl) phthalimide can better improve the adhesive force and the corrosion resistance of the paint; the catalyst catalyzes the ternary polymerization of polytetrafluoroethylene, 1-octene and alkenyl contained in the cyano compound obtained by the reaction, which is beneficial to improving the density after film formation and reducing the permeation of corrosive medium; the addition of zinc powder also has the effects of reducing the occurrence of electrochemical corrosion and prolonging the service life of the gate valve;
2. the ordered layered structure of the hydrotalcite powder adsorbs the zinc powder and is combined with each component of the coating, so that the contact area of the zinc powder and the coating is increased, the ordered structure is integrally formed, the purposes of reducing the defects and holes of the coating, enabling the structure to be compact and ordered are achieved, and the compactness and the impermeability of the coating are improved, so that the corrosion resistance is improved; 2-butenoic acid is used for carrying out functional modification on the hydrotalcite powder, and introduced carboxyl and other anion anchoring groups can be adsorbed on the surfaces of the hydrotalcite powder and the zinc powder, so that the compatibility between the hydrotalcite powder and the zinc powder as well as other components of the coating is improved, and the overall performance of the coating is improved;
3. the dioctyl phthalate is used as a solvent, so that the overall wettability of the components can be improved; the added prenol polyoxyethylene ether can generate a synergistic effect with dioctyl phthalate, and the introduced long side chain of the polyoxyethylene ether extends into the coating to form a space barrier, so that high dispersibility is realized, the mixing uniformity of the coating is higher, and the durability is improved; in addition, the prenyl polyoxyethylene ether can also react with carboxyl adsorbed on the surfaces of the hydrotalcite powder and the zinc powder, so that the blending stability of the hydrotalcite powder, the zinc powder and other organic components is further improved, and the integral performance of the coating is improved;
4. in the processing technology, firstly, the sand blasting treatment is adopted to improve the binding force between the workpiece and the corrosion-resistant coating and prolong the durability of the corrosion-resistant coating; secondly, coating and curing the corrosion-resistant coating by adopting three temperature gradients from high temperature to room temperature and then to low temperature, and coating for the first time at the high temperature to ensure that the coating is fluid and coated in a small amount, so that the coating can be filled in the pores of the valve body, and the surface of the valve body is smoother; coating the paint normally at room temperature, then coating a small amount of paint again, curing at low temperature, coating the next layer after the previous layer is dried during brushing, and enabling the layers to be criss-cross, thereby being beneficial to improving the curing effect and the durability of the coating and improving the corrosion resistance.
Detailed Description
The present application is described in further detail below.
In the present application, polytetrafluoroethylene is manufactured by Kapler Biotechnology, Inc., Shandong, model number kpl-56410; diaminomaleonitrile is manufactured by Beijing carbofuran technologies, Inc.; n- (2, 3-epoxypropyl) phthalimide was purchased from mobeth, brand: xi, cat number: SJ 01937875170; the zinc powder is special zinc powder for coating produced by the new nonferrous metal material company Limited in Jiangsu department; hydrotalcite powder was supplied by tai an Son hao chemical ltd; the prenyl polyoxyethylene ether is provided by a Haian petrochemical plant in Jiangsu province, and has the molecular weight of 2160-2640; in the sand blasting treatment, the quartz sand of 40-60 meshes is provided by Taizhenxianghuxing quartz powder factory in Engde city.
The raw materials used in the following embodiments may be those conventionally commercially available unless otherwise specified.
Examples
Example 1
The embodiment discloses a corrosion-resistant gate valve and a processing technology thereof; the utility model provides a corrosion-resistant gate valve, includes the valve body, and valve body surface coating has corrosion-resistant coating, and corrosion-resistant coating includes following component: polytetrafluoroethylene, diaminomaleonitrile, 1, 5-hexadienol, N- (2, 3-epoxypropyl) phthalimide, 1-octene, a catalyst, zinc powder and a solvent; wherein the catalyst is osmium tetroxide and the solvent is dioctyl phthalate.
A processing technology of a corrosion-resistant gate valve comprises the following steps:
s1, preparing corrosion-resistant paint; mixing diaminomaleonitrile, 1, 5-hexadienol and N- (2, 3-epoxypropyl) phthalimide, and stirring at 30 ℃ for reaction for 50min to obtain a cyano compound;
stirring the mixture of the zinc powder and the solvent at the rotating speed of 200r/min for 8min to obtain a dispersed zinc solution;
mixing polytetrafluoroethylene with a catalyst, then adding 1-octene and a cyano compound, heating to 70 ℃, and stirring for reacting for 2 hours; finally, adding a dispersed zinc solution, and continuously stirring for 15min to obtain the corrosion-resistant coating;
s2, preprocessing a valve body; carrying out sand blasting treatment on the surface of the valve body; the cleanliness reaches Sa2.5 grade by adopting 40-mesh quartz sand;
s3, coating the valve body with corrosion-resistant paint; and (3) coating the corrosion-resistant coating at room temperature to a coating thickness of 8 mu m, and drying for 2 h.
The contents of the components are shown in table 1 below.
Example 2
The embodiment discloses a corrosion-resistant gate valve and a processing technology thereof; the utility model provides a corrosion-resistant gate valve, includes the valve body, and valve body surface coating has corrosion-resistant coating, and corrosion-resistant coating includes following component: polytetrafluoroethylene, diaminomaleonitrile, 1, 5-hexadienol, N- (2, 3-epoxypropyl) phthalimide, 1-octene, a catalyst, zinc powder and a solvent; wherein the catalyst is osmium tetroxide and the solvent is dioctyl phthalate.
A processing technology of a corrosion-resistant gate valve comprises the following steps:
s1, preparing corrosion-resistant paint; mixing diaminomaleonitrile, 1, 5-hexadienol and N- (2, 3-epoxypropyl) phthalimide, and stirring to react for 60min at 40 ℃ to obtain a cyano compound;
stirring the mixture of the zinc powder and the solvent at the rotating speed of 250r/min for 12min to obtain a dispersed zinc solution;
mixing polytetrafluoroethylene with a catalyst, then adding 1-octene and a cyano compound, heating to 80 ℃, and stirring for reacting for 3 hours; finally, adding a dispersed zinc solution, and continuously stirring for 20min to obtain the corrosion-resistant coating;
s2, preprocessing a valve body; carrying out sand blasting treatment on the surface of the valve body; the cleanliness reaches Sa2.5 grade by adopting 60-mesh quartz sand;
s3, coating the valve body with corrosion-resistant paint; and (3) coating the corrosion-resistant coating at room temperature to a coating thickness of 10 mu m, and drying for 3 h.
The contents of the components are shown in table 1 below.
Example 3
The embodiment discloses a corrosion-resistant gate valve and a processing technology thereof; the utility model provides a corrosion-resistant gate valve, includes the valve body, and valve body surface coating has corrosion-resistant coating, and corrosion-resistant coating includes following component: polytetrafluoroethylene, diaminomaleonitrile, 1, 5-hexadienol, N- (2, 3-epoxypropyl) phthalimide, 1-octene, a catalyst, zinc powder and a solvent; wherein the catalyst is osmium tetroxide and the solvent is dioctyl phthalate.
A processing technology of a corrosion-resistant gate valve comprises the following steps:
s1, preparing corrosion-resistant paint; mixing diaminomaleonitrile, 1, 5-hexadienol and N- (2, 3-epoxypropyl) phthalimide, and stirring at 35 ℃ for reaction for 55min to obtain a cyano compound;
stirring the mixture of the zinc powder and the solvent at the rotating speed of 230r/min for 10min to obtain a dispersed zinc solution;
mixing polytetrafluoroethylene with a catalyst, then adding 1-octene and a cyano compound, heating to 75 ℃, and stirring for reacting for 2.5 hours; finally, adding a dispersed zinc solution, and continuously stirring for 18min to obtain the corrosion-resistant coating;
s2, preprocessing a valve body; carrying out sand blasting treatment on the surface of the valve body; the cleanliness reaches Sa2.5 grade by adopting 50-mesh quartz sand;
s3, coating the valve body with corrosion-resistant paint; and (3) coating the corrosion-resistant coating at room temperature to a coating thickness of 9 mu m, and drying for 2.5 h.
The contents of the components are shown in table 1 below.
Example 4
The embodiment discloses a corrosion-resistant gate valve and a processing technology thereof; the utility model provides a corrosion-resistant gate valve, includes the valve body, and valve body surface coating has corrosion-resistant coating, and corrosion-resistant coating includes following component: polytetrafluoroethylene, diaminomaleonitrile, 1, 5-hexadienol, N- (2, 3-epoxypropyl) phthalimide, 1-octene, catalyst, zinc powder, solvent, hydrotalcite powder, 2-butenoic acid and prenol polyoxyethylene ether; wherein the catalyst is osmium tetroxide and the solvent is dioctyl phthalate.
A processing technology of a corrosion-resistant gate valve comprises the following steps:
s1, preparing corrosion-resistant paint; mixing diaminomaleonitrile, 1, 5-hexadienol and N- (2, 3-epoxypropyl) phthalimide, and stirring at 30 ℃ for reaction for 50min to obtain a cyano compound;
mixing zinc powder and solvent dioctyl phthalate, and stirring at the rotation speed of 200r/min for 8 min; mixing with isoamylol polyoxyethylene ether, and stirring for 5 min; then adding 2-butenoic acid and hydrotalcite powder, mixing, and carrying out ultrasonic treatment for 5min at the ultrasonic power of 100W and the frequency of 20kHz to obtain a dispersed mixture;
mixing polytetrafluoroethylene with a catalyst, then adding 1-octene and a cyano compound, heating to 70 ℃, and stirring for reacting for 2 hours; finally, adding the dispersed mixture, and continuously stirring for 15min to obtain the corrosion-resistant coating;
s2, preprocessing a valve body; carrying out sand blasting treatment on the surface of the valve body; the cleanliness reaches Sa2.5 grade by adopting 40-mesh quartz sand;
s3, coating the valve body with corrosion-resistant paint; primary coating; heating to 50 ℃, coating the corrosion-resistant coating on the surface of the valve body, wherein the coating thickness is 1 mu m, cooling to room temperature, and drying for 1 h;
repeating the coating; coating the corrosion-resistant coating for the second time at room temperature, wherein the coating thickness is 8 mu m, and drying for 2 h;
curing; coating was carried out again, with a coating thickness of 2 μm, and curing was carried out at 15 ℃ for 1 h.
The contents of the components are shown in table 1 below.
Example 5
The embodiment discloses a corrosion-resistant gate valve and a processing technology thereof; the utility model provides a corrosion-resistant gate valve, includes the valve body, and valve body surface coating has corrosion-resistant coating, and corrosion-resistant coating includes following component: polytetrafluoroethylene, diaminomaleonitrile, 1, 5-hexadienol, N- (2, 3-epoxypropyl) phthalimide, 1-octene, catalyst, zinc powder, solvent, hydrotalcite powder, 2-butenoic acid and prenol polyoxyethylene ether; wherein the catalyst is osmium tetroxide and the solvent is dioctyl phthalate.
A processing technology of a corrosion-resistant gate valve comprises the following steps:
s1, preparing corrosion-resistant paint; mixing diaminomaleonitrile, 1, 5-hexadienol and N- (2, 3-epoxypropyl) phthalimide, and stirring to react for 60min at 40 ℃ to obtain a cyano compound;
mixing zinc powder and solvent dioctyl phthalate, and stirring at 250r/min for 12 min; mixing with isoamylol polyoxyethylene ether, and stirring for 6 min; then adding 2-butenoic acid and hydrotalcite powder, mixing, and carrying out ultrasonic treatment for 8min at the ultrasonic power of 120W and the frequency of 30kHz to obtain a dispersed mixture;
mixing polytetrafluoroethylene with a catalyst, then adding 1-octene and a cyano compound, heating to 80 ℃, and stirring for reacting for 3 hours; finally, adding the dispersed mixture, and continuously stirring for 20min to obtain the corrosion-resistant coating;
s2, preprocessing a valve body; carrying out sand blasting treatment on the surface of the valve body; the cleanliness reaches Sa2.5 grade by adopting 60-mesh quartz sand;
s3, coating the valve body with corrosion-resistant paint; primary coating; heating to 60 ℃, coating the corrosion-resistant coating on the surface of the valve body, wherein the coating thickness is 2 mu m, cooling to room temperature, and drying for 2 hours;
repeating the coating; coating the corrosion-resistant coating for the second time at room temperature, wherein the coating thickness is 10 mu m, and drying for 3 h;
curing; coating was carried out again to a coating thickness of 3 μm and cured at 20 ℃ for 2 h.
The contents of the components are shown in table 1 below.
Example 6
The embodiment discloses a corrosion-resistant gate valve and a processing technology thereof; the utility model provides a corrosion-resistant gate valve, includes the valve body, and valve body surface coating has corrosion-resistant coating, and corrosion-resistant coating includes following component: polytetrafluoroethylene, diaminomaleonitrile, 1, 5-hexadienol, N- (2, 3-epoxypropyl) phthalimide, 1-octene, catalyst, zinc powder, solvent, hydrotalcite powder, 2-butenoic acid and prenol polyoxyethylene ether; wherein the catalyst is osmium tetroxide and the solvent is dioctyl phthalate.
A processing technology of a corrosion-resistant gate valve comprises the following steps:
s1, preparing corrosion-resistant paint; mixing diaminomaleonitrile, 1, 5-hexadienol and N- (2, 3-epoxypropyl) phthalimide, and stirring at 35 ℃ for reaction for 55min to obtain a cyano compound;
mixing the zinc powder and a solvent dioctyl phthalate, and stirring at the rotating speed of 230r/min for 10 min; mixing with isoamylol polyoxyethylene ether, and stirring for 6 min; then adding 2-butenoic acid and hydrotalcite powder, mixing, and treating for 6min by ultrasonic waves with the ultrasonic power of 110W and the frequency of 25kHz to obtain a dispersed mixture;
mixing polytetrafluoroethylene with a catalyst, then adding 1-octene and a cyano compound, heating to 75 ℃, and stirring for reacting for 2.5 hours; finally, adding the dispersed mixture, and continuously stirring for 18min to obtain the corrosion-resistant coating;
s2, preprocessing a valve body; carrying out sand blasting treatment on the surface of the valve body; the cleanliness reaches Sa2.5 grade by adopting 50-mesh quartz sand;
s3, coating the valve body with corrosion-resistant paint; primary coating; heating to 55 ℃, coating the corrosion-resistant coating on the surface of the valve body, wherein the coating thickness is 2 mu m, cooling to room temperature, and drying for 1.5 h;
repeating the coating; coating the corrosion-resistant coating for the second time at room temperature, wherein the coating thickness is 9 mu m, and drying for 2.5 h;
curing; coating was carried out again, with a coating thickness of 2 μm, and curing was carried out at 16 ℃ for 1.5 h.
The contents of the components are shown in table 1 below.
Example 7
The difference from example 1 is that the corrosion-resistant coating further includes hydrotalcite powder, and the contents of the components are shown in table 2 below.
Example 8
The difference from example 7 is that the corrosion-resistant coating further comprises 2-butenoic acid, and the content of each component is shown in the following table 2.
Example 9
The difference from example 8 is that the hydrotalcite powder was replaced with montmorillonite, and the contents of the respective components are shown in table 2 below.
Example 10
The difference from example 8 is that 2-butenoic acid was replaced with butenol, and the contents of the components are shown in Table 2 below.
Example 11
The corrosion-resistant coating is different from the corrosion-resistant coating in example 1 in that the corrosion-resistant coating further comprises prenyl polyoxyethylene ether, and the content of each component is shown in the following table 2.
Example 12
The difference from example 11 is that the solvent dioctyl phthalate was replaced with toluene, and the contents of the respective components are shown in table 2 below.
Example 13
The difference from example 12 is that prenyl polyoxyethylene ether was replaced with diethyl ether, and the contents of the respective components are shown in Table 2 below.
Example 14
The catalyst osmium tetroxide was replaced with palladium dichloride.
Comparative example
Comparative example 1
A gate valve not coated with the corrosion resistant coating was used as comparative example 1.
Comparative example 2
The difference from example 1 is that the components of the corrosion-resistant coating are only polytetrafluoroethylene, and the contents of the components are shown in table 1 below.
Comparative example 3
The difference from example 1 is that diaminomaleonitrile was replaced by malononitrile, and the contents of the components are shown in table 3 below.
Comparative example 4
The difference from comparative example 3 is that 1, 5-hexadienol was replaced with glycerol, and the contents of the respective components are shown in Table 3 below.
Comparative example 5
The difference from comparative example 4 is that N- (2, 3-epoxypropyl) phthalimide was replaced with propylene oxide, and the contents of the respective components are shown in Table 3 below.
Comparative example 6
The difference from comparative example 5 is that 1-octene was replaced with isooctane and the contents of the components are shown in table 3 below.
Comparative example 7
The difference from example 1 is that, without adding zinc powder, the contents of the components are shown in Table 3 below.
Comparative example 8
The difference from example 1 is that in the process for processing the corrosion-resistant gate valve, S3 includes the following steps:
primary coating; heating to 50 ℃, coating the corrosion-resistant coating on the surface of the valve body, wherein the coating thickness is 1 mu m, cooling to room temperature, and drying for 1 h;
repeating the coating; coating the corrosion-resistant coating for the second time at room temperature, wherein the coating thickness is 8 mu m, and drying for 2 h;
curing; coating was carried out again, with a coating thickness of 2 μm, and curing was carried out at 15 ℃ for 1 h.
Comparative example 9
The difference from example 1 is that 30-mesh quartz sand was used for blasting.
TABLE 1 ingredient content tables for examples 1-6
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Polytetrafluoroethylene | 30 | 40 | 35 | 30 | 40 | 35 |
| Diaminomaleonitrile | 12 | 15 | 14 | 12 | 15 | 14 |
| 1, 5-hexadienol | 4 | 5 | 4 | 4 | 5 | 4 |
| N- (2, 3-epoxypropyl) phthalimide | 2 | 3 | 3 | 2 | 3 | 3 |
| 1-octene | 6 | 8 | 7 | 6 | 8 | 7 |
| Catalyst and process for preparing same | 1 | 2 | 1 | 1 | 2 | 1 |
| Zinc powder | 6 | 10 | 8 | 6 | 10 | 8 |
| Solvent(s) | 15 | 20 | 18 | 15 | 20 | 18 |
| Hydrotalcite powder | / | / | / | 3 | 4 | 3 |
| 2-butenoic acid | / | / | / | 4 | 5 | 5 |
| Isopentenol polyoxyethylene ether | / | / | / | 6 | 8 | 7 |
TABLE 2 ingredient content tables for examples 7-13
| Example 7 | Example 8 | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 | |
| Polytetrafluoroethylene | 30 | 30 | 30 | 30 | 30 | 30 | 30 |
| Diaminomaleonitrile | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| 1, 5-hexadienol | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| N- (2, 3-epoxypropyl) phthalimide | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 1-octene | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Catalyst and process for preparing same | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Zinc powder | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Solvent(s) | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Hydrotalcite powder/montmorillonite | 3 | 3 | 3 | 3 | / | / | / |
| 2-butenoic acid/butenol | / | 4 | 4 | 4 | / | / | / |
| Isopentenol polyoxyethylene ether/ethyl ether | / | / | / | / | 6 | 6 | 6 |
TABLE 3 ingredient content of comparative examples 3 to 7
| Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 | |
| Polytetrafluoroethylene | 30 | 30 | 30 | 30 | 30 |
| Diaminomaleonitrile/malononitrile | 12 | 12 | 12 | 12 | 12 |
| 1, 5-hexadienol/glycerol | 4 | 4 | 4 | 4 | 4 |
| N- (2, 3-epoxypropyl) phthalimide/propylene oxide | 2 | 2 | 2 | 2 | 2 |
| 1-octene/isooctane | 6 | 6 | 6 | 6 | 6 |
| Catalyst and process for preparing same | 1 | 1 | 1 | 1 | 1 |
| Zinc powder | 6 | 6 | 6 | 6 | / |
| Solvent(s) | 15 | 15 | 15 | 15 | 15 |
Performance test
(1) And (3) corrosion resistance test: according to the processing technology of each embodiment and comparative example, a metal sample with the same material as a gate valve and the thickness of 50mm multiplied by 30mm is prepared; carrying out a corrosion test, wherein the corrosion rate is as follows: the corrosion speed is expressed by the corrosion depth in unit time, NaCl with the solution concentration of (5 +/-0.1)% is adopted, the temperature is 35 +/-2 ℃, the humidity is 95%, continuous spraying is adopted, and the test time is 168h (7 days); the corrosion resistance is characterized by the corrosion rate, the smaller the corrosion rate, the better the corrosion resistance, and the test results are shown in table 4 below.
TABLE 4 Corrosion resistance test results of examples and comparative examples
| Corrosion rate (V/mm. a)-1） | |
| Example 1 | 0.9407 |
| Example 2 | 0.8543 |
| Example 3 | 0.9026 |
| Example 4 | 0.7072 |
| Example 5 | 0.6248 |
| Example 6 | 0.6733 |
| Example 7 | 0.8294 |
| Example 8 | 0.7982 |
| Example 9 | 0.8531 |
| Example 10 | 0.8870 |
| Example 11 | 0.8429 |
| Example 12 | 0.8505 |
| Example 13 | 0.8781 |
| Example 14 | 0.9540 |
| Comparative example 1 | 1.4037 |
| Comparative example 2 | 1.1462 |
| Comparative example 3 | 0.9873 |
| Comparative example 4 | 0.9980 |
| Comparative example 5 | 1.0349 |
| Comparative example 6 | 1.0623 |
| Comparative example 7 | 0.9794 |
| Comparative example 8 | 0.9148 |
| Comparative example 9 | 0.9496 |
In summary, the following conclusions can be drawn:
the mixing of the hydrotalcite powder and the 2-butenoic acid, the synergism of the diaminomaleonitrile, the 1, 5-hexadiene alcohol and the N- (2, 3-epoxypropyl) phthalimide, and the compounding of the prenol polyoxyethylene ether and the dioctyl phthalate have good synergistic effect on improving the corrosion resistance of the corrosion-resistant coating, and are beneficial to improving the corrosion resistance of a gate valve.
In addition, adopt the processing technology of this application to carry out the coating of sand blasting and corrosion-resistant coating, can further promote the corrosion-resistant effect of gate valve.
The present embodiment is only for explaining the present application, and the protection scope of the present application is not limited thereby, and those skilled in the art can make modifications to the present embodiment without inventive contribution as needed after reading the present specification, but all are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The utility model provides a corrosion-resistant gate valve, includes the valve body, its characterized in that: the valve body surface is coated with a corrosion-resistant coating, and the corrosion-resistant coating comprises the following components in parts by weight:
30-40 parts of polytetrafluoroethylene;
12-15 parts of diaminomaleonitrile;
4-5 parts of 1, 5-hexadienol;
2-3 parts of N- (2, 3-epoxypropyl) phthalimide;
6-8 parts of 1-octene;
1-2 parts of a catalyst;
6-10 parts of zinc powder;
15-20 parts of solvent.
2. A corrosion resistant gate valve according to claim 1, wherein: the corrosion-resistant coating also comprises 3-4 parts of hydrotalcite powder by weight.
3. A corrosion resistant gate valve according to claim 2, wherein: the corrosion-resistant coating also comprises 4-5 parts of 2-butenoic acid by weight.
4. A corrosion resistant gate valve according to claim 3, wherein: the solvent is dioctyl phthalate, and the corrosion-resistant coating further comprises 6-8 parts of isopentenol polyoxyethylene ether in parts by weight.
5. A corrosion resistant gate valve according to claim 1, wherein: the catalyst is osmium tetroxide.
6. The process for manufacturing a corrosion-resistant gate valve as claimed in claim 1, comprising the steps of:
s1, preparing corrosion-resistant paint; mixing diaminomaleonitrile, 1, 5-hexadienol and N- (2, 3-epoxypropyl) phthalimide, and stirring to react at 30-40 ℃ for 50-60min to obtain a cyano compound;
stirring the mixture of the zinc powder and the solvent at the rotating speed of 200-250r/min for 8-12min to obtain a dispersed zinc solution;
mixing polytetrafluoroethylene with a catalyst, then adding 1-octene and a cyano compound, heating to 70-80 ℃, and stirring for reacting for 2-3 h; finally, adding the dispersed zinc solution, and continuously stirring for 15-20min to obtain the corrosion-resistant coating;
s2, preprocessing a valve body; carrying out sand blasting treatment on the surface of the valve body;
s3, coating the valve body with corrosion-resistant paint; coating the corrosion-resistant coating at room temperature to a coating thickness of 8-10 μm, and drying for 2-3 h.
7. The process of claim 6, wherein the step of machining the corrosion-resistant gate valve comprises the following steps: the S1 further includes the steps of:
mixing 12-15 parts of diaminomaleonitrile, 4-5 parts of 1, 5-hexadiene alcohol and 2-3 parts of N- (2, 3-epoxypropyl) phthalimide, and stirring for reacting for 50-60min at 30-40 ℃ to obtain a cyano compound;
mixing 6-10 parts of zinc powder and 15-20 parts of solvent dioctyl phthalate, and stirring at the rotation speed of 200-250r/min for 8-12 min; mixing with 6-8 parts of isopentenol polyoxyethylene ether, and stirring for 5-6 min; then adding 4-5 parts of 2-butenoic acid and 3-4 parts of hydrotalcite powder, and carrying out ultrasonic treatment for 5-8min at the ultrasonic power of 100-120W and the frequency of 20-30kHz to obtain a dispersed mixture;
mixing 30-40 parts of polytetrafluoroethylene and 1-2 parts of catalyst, then adding 6-8 parts of 1-octene and cyano compound, heating to 70-80 ℃, and stirring for reacting for 2-3 hours; and finally, adding the dispersed mixture, and continuously stirring for 15-20min to obtain the corrosion-resistant coating.
8. The process of claim 7, wherein the gate valve is a corrosion-resistant gate valve, comprising the following steps: the S3 further includes the steps of:
primary coating; heating to 50-60 ℃, coating the corrosion-resistant coating on the surface of the valve body, wherein the coating thickness is 1-2 mu m, cooling to room temperature, and drying for 1-2 h;
repeating the coating; coating the corrosion-resistant coating for the second time at room temperature, wherein the coating thickness is 8-10 mu m, and drying for 2-3 h;
curing; coating again to a coating thickness of 2-3 μm, and curing at 15-20 deg.C for 1-2 h.
9. A corrosion resistant gate valve according to claim 6, wherein: in the S2, 40-60-mesh quartz sand is adopted for sand blasting treatment, and the cleanliness reaches Sa2.5 grade.
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| DE3920917A1 (en) * | 1989-06-26 | 1991-01-03 | Hoechst Ag | OXIDIC HETEROGEN CATALYSTS OF OSMIUM, METHOD FOR THE PRODUCTION THEREOF, AND THEIR USE OF OLEFINIC COMPOUNDS IN GLYCLE |
| CN1579618A (en) * | 2003-08-06 | 2005-02-16 | 中国科学院大连化学物理研究所 | Carrying-type metal catalyst and its preparation method |
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