CN113150683A - Environment-friendly underwater special anticorrosive coating and preparation method thereof - Google Patents
Environment-friendly underwater special anticorrosive coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an environment-friendly underwater special anticorrosive coating and a preparation method thereof, wherein the environment-friendly underwater special anticorrosive coating comprises the following components in parts by mass: 35-50 parts of silicone resin; 7-10 parts of nano polytetrafluoroethylene; coating a powder material by 30-35; others are pigments and curing agents. The environment-friendly underwater special anticorrosive coating and the preparation method thereof have the characteristics of environmental protection, no toxicity, no odor and no release, simultaneously have excellent physical and mechanical properties and chemical medium resistance, are combined with advanced construction technology and equipment, can quickly and effectively improve the construction progress, and have higher social benefit.
Description
Technical Field
The invention relates to the technical field of anticorrosive coatings, in particular to an environment-friendly underwater special anticorrosive coating and a preparation method thereof.
Background
With the accelerated advance of industrial modernization in China, the nation advocates the accelerated development of marine economy, a great deal of maritime works are called for, and particularly the construction of a cross-sea bridge and a submarine tunnel greatly promotes the development of coastal area economy. However, in the process of constructing a great infrastructure such as a cross-sea bridge, a lot of technical challenges are faced, so that the technological progress can be promoted only by continuous innovation and practice.
In the case of a steel column of a sea-crossing bridge, the steel column needs to bear the weight of the bridge body of the bridge with huge load, and is also subjected to tests such as seawater scouring and abrasion for a long time. At present, a plastic spraying process is adopted domestically for corrosion prevention of a steel column of a sea-crossing bridge, but the effect is not ideal. When the use condition of the steel column with the surface adopting the plastic spraying process is tracked, the effect is worse than the imagination, the coating after the plastic spraying is basically not available for one year, and even the coating is basically abraded and remains a few. According to the analysis, the flow velocity of the seawater is 1-3 m/s, the sand content is high, and the corrosion effect of chloride ions in the seawater can generate an abrasion effect on the steel column. In conclusion, the plastic-sprayed material cannot bear the heavy burden of being soaked in seawater for a long time, and the service life of the plastic-sprayed material is greatly shortened due to the fact that a coating is softened and poor in adhesion when the plastic-sprayed material is used in seawater soaking and the sand-containing flow rate of the seawater is used for scouring.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problems in the background art, the environment-friendly underwater special anticorrosive coating and the preparation method thereof are provided, the coating can resist seawater immersion for a long time, has strong adhesive force, high density, high gloss, high hardness and high wear resistance, enhances the aging resistance by combining with silicone resin, and has good construction performance.
The technical scheme adopted by the invention for solving the technical problems is as follows: an environment-friendly underwater special anticorrosive coating comprises the following components in parts by weight:
35-50 parts of silicone resin;
7-10 parts of nano polytetrafluoroethylene;
coating a powder material by 30-35;
others are pigments and curing agents.
Further specifically, in the above technical solution, the ratio of the silicone resin to the nano polytetrafluoroethylene is 1: 0.2.
Further specifically, in the technical scheme, the PH values of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent are all 7-8.
Further specifically, in the above technical solution, the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment are mixed to form a component a, and the curing agent is a component b, so that the component a: the component B is 100: 30.
In the above technical solution, the silicone resin is any one of a solvent-free pure silicone resin and a solvent-free silicone epoxy resin.
More specifically, in the above technical solution, the nano-polytetrafluoroethylene is any one of nano-silicon modified polytetrafluoroethylene and nano-vermiculite modified polytetrafluoroethylene.
Further specifically, in the technical scheme, the pigment is any one of graphene, nano carbon black, inorganic black and copper-chromium black, and the parts of the pigment are 5-6 by mass.
In the technical scheme, the pigment is any one of nano iron oxide red, permanent red and inorganic molybdenum chrome red, and the parts of the pigment are 7-9 in parts by mass.
More specifically, in the above technical solution, the curing agent is any one of a polyamide curing agent, cardanol 3115 and fatty amine.
A preparation method of an environment-friendly underwater special anticorrosive coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 35-50 parts of silicone resin, 7-10 parts of nano polytetrafluoroethylene, 30-35 parts of coating powder material, pigment and curing agent;
step 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1;
step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30;
step 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain a component A which is uniformly mixed and has qualified grinding fineness;
and 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 1-3 minutes, and curing for 8-10 minutes to obtain the environment-friendly underwater special anticorrosive coating.
The invention has the beneficial effects that: the invention relates to an environment-friendly underwater special anticorrosive coating and a preparation method thereof, which have the advantages of environmental protection, no toxicity, no odor, no release, high solid content, high density, high gloss, good barrier property, excellent anticorrosive property, and good acid, alkali, salt and heat resistance, can be widely applied to corrosion protection of equipment or facilities which operate in water for a long time, such as various bridges, ships, offshore oil drilling platforms, submarine pipelines, tunnels, immersed tubes, wharf steel columns, water conservancy facilities and the like, has great innovation that the coating can be directly operated in water, can well realize solidification without polluting the water, can be applied to roller coating and brush coating during construction, breaks through the bottleneck that the traditional coating cannot be really used in high humidity or underwater, and creatively realizes an underwater spraying technology on the basis of underwater operation and use, improves the efficiency, therefore, the high cost of the diver in underwater operation is greatly saved, the progress of engineering construction is accelerated, and the social benefit is improved.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An environment-friendly underwater special anticorrosive coating comprises a surface coating and a bottom coating.
The surface coating comprises the following components in parts by weight: 35 parts of silicone resin, 7 parts of nano polytetrafluoroethylene, 30 parts of coating powder material, 5 parts of pigment and 23.1 parts of curing agent. The ratio of the silicone resin to the nano polytetrafluoroethylene is 1: 0.2. The PH values of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent are all 7. The silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment are mixed into a component A, and the curing agent is a component B, so that the component A is as follows: the component B is 100: 30. The silicone resin is solvent-free pure silicone resin. The nano polytetrafluoroethylene is nano silicon modified polytetrafluoroethylene. The pigment adopts graphene. The coating powder material adopts silane coupling agent. The curing agent is a special curing agent with high solid content under water, and if the curing agent is at the normal temperature of 5-35 ℃, a polyamide curing agent is usually selected; if the temperature is lower than 5 ℃, a curing agent for winter, namely cardanol 3115, is usually selected, and because the curing agent is used for marine underwater corrosion prevention, the curing agent can be cured underwater only by being insoluble in water and having a hydrophobic function, and the curing agent is non-volatile, non-floating, strong in adhesive force, excellent in flexibility and high in hardness, fatty amine is selected as the curing agent.
The preparation method of the surface coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 35 silicone resin, 7 nano polytetrafluoroethylene, 30 coating powder, 5 pigment and 23.1 curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
The coating process of the silicone resin is as follows: pouring silicone resin (solvent-free pure silicone resin) and a coating powder material (silane coupling agent) into a reaction kettle, heating for reaction, so that a coating film is formed on the surface of the silicone resin (solvent-free pure silicone resin), and drying, dispersing and packaging the reacted material.
The coating process of the pigment is as follows: the pigment (graphene) and the coating powder material (silane coupling agent) are poured into a reaction kettle and are heated to react, so that a coating film is formed on the surface of the pigment (graphene), and the reacted material is dried, dispersed and packaged.
Step 3, mixing the silicon resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2, electrically stirring to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100:30, and the pH value of the mixed liquid slurry of the component A is 7.
And 4, feeding the component A obtained in the step 3 into a stainless kettle for high-speed grinding dispersion and synthesis to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 1 minute, and curing for 8 minutes to obtain the surface coating of the environment-friendly underwater special anticorrosive coating.
The bottom coating comprises the following components in parts by mass: silicone resin 35, nano polytetrafluoroethylene 7, coating powder material 30, pigment 7 and curing agent 23.7. The ratio of the silicone resin to the nano polytetrafluoroethylene is 1: 0.2. The PH values of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent are all 7. The silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment are mixed into a component A, and the curing agent is a component B, so that the component A is as follows: the component B is 100: 30. The silicone resin is solvent-free pure silicone resin. The nano polytetrafluoroethylene is nano silicon modified polytetrafluoroethylene. The pigment is nano iron oxide red. The coating powder material adopts silane coupling agent. The curing agent is a special curing agent with high solid content under water, and if the curing agent is at the normal temperature of 5-35 ℃, a polyamide curing agent is usually selected; if the temperature is lower than 5 ℃, a curing agent for winter, namely cardanol 3115, is usually selected, and because the curing agent is used for marine underwater corrosion prevention, the curing agent can be cured underwater only by being insoluble in water and having a hydrophobic function, and the curing agent is non-volatile, non-floating, strong in adhesive force, excellent in flexibility and high in hardness, fatty amine is selected as the curing agent.
The preparation method of the bottom coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 35 of silicone resin, 7 of nano polytetrafluoroethylene, 30 of coating powder material, 7 of pigment and 23.7 of curing agent;
and 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
The coating process of the silicone resin is as follows: pouring silicone resin (solvent-free pure silicone resin) and a coating powder material (silane coupling agent) into a reaction kettle, heating for reaction, so that a coating film is formed on the surface of the silicone resin (solvent-free pure silicone resin), and drying, dispersing and packaging the reacted material.
The coating process of the pigment is as follows: the pigment (nano iron oxide red) and the coating powder material (silane coupling agent) are poured into a reaction kettle and heated to react, so that a coating film is formed on the surface of the pigment (nano iron oxide red), and the reacted material is dried, dispersed and packaged.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 1 minute, and curing for 8 minutes to obtain the bottom coating of the environment-friendly underwater special anticorrosive coating.
It should be noted that:
(1) the solvent-free pure silicone resin does not contain solvent, and has excellent hydrophobic function.
(2) The nano silicon modified polytetrafluoroethylene has excellent comprehensive corrosion resistance, and can protect corrosion of various acids, alkalis and salts.
(3) The graphene has the advantages of cathode protection, good stability and strong tinting strength, is used for surface coating, and has an excellent hydrophobic function.
(4) The nano iron oxide red has high specific gravity and resistance to cathodic protection, is used for a bottom coating and has an excellent hydrophobic function.
(5) The color of the pigment is determined at the user's choice, typically red or gray.
(6) The coating powder material has excellent hydrophobic function.
The composition of example 1 is shown in table 1 below:
the obtained environment-friendly underwater special anticorrosive coating is roll-coated or sprayed on the surface of roll-hardened soil and a bridge steel column underwater, and the surface is dried at normal temperature for 3 hours and is dried in real time for 24 hours, and the coating can be used in a week. After the coating is completely cured, the coating is tough and plump, forms a ceramic-like structure, and has good adhesive force to metal or concrete foundation. The surface of the base material is polished by a pneumatic grinder under water until loose corrosion of oyster is removed and basic essence is exposed. The coating was sprayed or roll coated twice under water to a dry film thickness of 1.2 mm.
Example 2
The difference between example 2 and example 1 is that: an environment-friendly underwater special anticorrosive coating comprises a surface coating and a bottom coating.
The surface coating comprises the following components in parts by weight: 40 parts of silicone resin, 8 parts of nano polytetrafluoroethylene, 32 parts of coating powder materials, 5 parts of pigment and 25.5 parts of curing agent. The silicone resin is solvent-free pure silicone resin. The nano polytetrafluoroethylene is nano silicon modified polytetrafluoroethylene. The pigment adopts nano carbon black. The coating powder material adopts silane coupling agent. The curing agent is selected from fatty amine.
The preparation method of the surface coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 40 of silicone resin, 8 of nano polytetrafluoroethylene, 32 of coating powder material, 5 of pigment and 25.5 of curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 2 minutes, and curing for 9 minutes to obtain the surface coating of the environment-friendly underwater special anticorrosive coating.
The bottom coating comprises the following components in parts by mass: 40 parts of silicone resin, 8 parts of nano polytetrafluoroethylene, 32 parts of coating powder materials, 7 parts of pigment and 26.1 parts of curing agent. The silicone resin is solvent-free pure silicone resin. The nano polytetrafluoroethylene is nano silicon modified polytetrafluoroethylene. The pigment is permanent red. The coating powder material adopts silane coupling agent. The curing agent is selected from fatty amine.
The preparation method of the bottom coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 40 of silicone resin, 8 of nano polytetrafluoroethylene, 32 of coating powder, 7 of pigment and 26.1 of curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 2 minutes, and curing for 9 minutes to obtain the bottom coating of the environment-friendly underwater special anticorrosive coating.
The components of example 2 are shown in table 2 below:
example 3
Example 3 differs from example 1 in that:
an environment-friendly underwater special anticorrosive coating comprises a surface coating and a bottom coating.
The surface coating comprises the following components in parts by weight: 42.5 parts of silicone resin, 8.5 parts of nano polytetrafluoroethylene, 34 parts of coating powder materials, 6 parts of pigment and 27.3 parts of curing agent. The PH of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent is 8. The silicone resin is solvent-free silicone epoxy resin. The nano polytetrafluoroethylene is nano silicon modified polytetrafluoroethylene. The pigment adopts graphene. The coating powder material adopts silane coupling agent. The curing agent is selected from fatty amine.
The preparation method of the surface coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 42.5 of silicone resin, 8.5 of nano polytetrafluoroethylene, 34 of coating powder material, 6 of pigment and 27.3 of curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 2 minutes, and curing for 9 minutes to obtain the surface coating of the environment-friendly underwater special anticorrosive coating.
The bottom coating comprises the following components in parts by mass: 42.5 parts of silicone resin, 8.5 parts of nano polytetrafluoroethylene, 34 parts of coating powder materials, 8 parts of pigment and 27.9 parts of curing agent. The PH of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent is 8. The silicone resin is solvent-free silicone epoxy resin. The nano polytetrafluoroethylene is nano silicon modified polytetrafluoroethylene. The pigment is nano iron oxide red. The coating powder material adopts silane coupling agent. The curing agent is selected from fatty amine.
The preparation method of the bottom coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 42.5 of silicone resin, 8.5 of nano polytetrafluoroethylene, 34 of coating powder material, 8 of pigment and 27.9 of curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 2 minutes, and curing for 9 minutes to obtain the bottom coating of the environment-friendly underwater special anticorrosive coating.
It should be noted that:
(1) the solvent-free organic silicon epoxy resin does not contain a solvent and has high viscosity, and although the solvent-free organic silicon epoxy resin is synthesized by an organic silicon resin technology, the solvent-free organic silicon epoxy resin still does not contain the solvent, but increases the flexibility, the aging resistance and the oxidation resistance, and plays a leading comprehensive performance in a coating.
(2) The preparation process of the solvent-free organic silicon epoxy resin comprises the following steps: adding silicon resin, starting a stirrer, adding bisphenol F resin, heating at 120 ℃ for 3 hours without adding any auxiliary agent, and finally stirring at normal temperature for 1.5-2 hours to obtain the modified high-solid-content resin, thereby obtaining the solvent-free organic silicon epoxy resin with high density and flexibility, wherein the mass component ratio of silicon is 10%, and the mass component ratio of the epoxy resin is 90%.
The composition of example 3 is shown in table 3 below:
example 4
Example 4 differs from example 1 in that:
an environment-friendly underwater special anticorrosive coating comprises a surface coating and a bottom coating.
The surface coating comprises the following components in parts by weight: 45 parts of silicone resin, 9 parts of nano polytetrafluoroethylene, 34 parts of coating powder materials, 6 parts of pigment and 28.2 parts of curing agent. The PH of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent is 8. The silicone resin is solvent-free silicone epoxy resin. The nano polytetrafluoroethylene is modified by nano vermiculite. The pigment is inorganic black. The coating powder material adopts silane coupling agent. The curing agent is selected from fatty amine.
The preparation method of the surface coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 45 of silicone resin, 9 of nano polytetrafluoroethylene, 34 of coating powder, 6 of pigment and 28.2 of curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 2 minutes, and curing for 9 minutes to obtain the surface coating of the environment-friendly underwater special anticorrosive coating.
The bottom coating comprises the following components in parts by mass: 45 parts of silicone resin, 9 parts of nano polytetrafluoroethylene, 34 parts of coating powder materials, 8 parts of pigment and 28.8 parts of curing agent. The PH of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent is 8. The silicone resin is solvent-free silicone epoxy resin. The nano polytetrafluoroethylene is modified by nano vermiculite. The pigment is permanent red. The coating powder material adopts silane coupling agent. The curing agent is selected from fatty amine.
The preparation method of the bottom coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 45 of silicone resin, 9 of nano polytetrafluoroethylene, 34 of coating powder, 8 of pigment and 28.8 of curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 2 minutes, and curing for 9 minutes to obtain the bottom coating of the environment-friendly underwater special anticorrosive coating.
The composition of example 4 is shown in table 4 below:
example 5
Example 5 differs from example 1 in that:
an environment-friendly underwater special anticorrosive coating comprises a surface coating and a bottom coating.
The surface coating comprises the following components in parts by weight: 50 parts of silicone resin, 10 parts of nano polytetrafluoroethylene, 35 parts of coating powder materials, 6 parts of pigment and 30.3 parts of curing agent. The PH of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent is 8. The silicone resin is solvent-free silicone epoxy resin. The nano polytetrafluoroethylene is modified by nano vermiculite. The pigment is copper-chromium black. The coating powder material adopts silane coupling agent. The curing agent is selected from fatty amine.
The preparation method of the surface coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 50 of silicon resin, 10 of nano polytetrafluoroethylene, 35 of coating powder material, 6 of pigment and 30.3 of curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 3 minutes, and curing for 10 minutes to obtain the surface coating of the environment-friendly underwater special anticorrosive coating.
The bottom coating comprises the following components in parts by mass: 50 parts of silicone resin, 10 parts of nano polytetrafluoroethylene, 35 parts of coating powder materials, 9 parts of pigment and 31.2 parts of curing agent. The PH of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent is 8. The silicone resin is solvent-free silicone epoxy resin. The nano polytetrafluoroethylene is modified by nano vermiculite. The pigment is inorganic molybdenum chrome red. The coating powder material adopts silane coupling agent. The curing agent is selected from fatty amine.
The preparation method of the bottom coating comprises the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 50 of silicon resin, 10 of nano polytetrafluoroethylene, 35 of coating powder material, 9 of pigment and 31.2 of curing agent.
And 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1.
Step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30.
And 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain the component A which is uniformly mixed and has qualified grinding fineness.
And 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 3 minutes, and curing for 10 minutes to obtain the bottom coating of the environment-friendly underwater special anticorrosive coating.
The components of example 5 are shown in table 5 below:
the performance test data of the environment-friendly underwater special anticorrosive coating of the invention is shown in the following table 6:
the environment-friendly underwater special anticorrosive coatings obtained in the embodiments 1, 2, 3, 4 and 5 are tested, and the test results are as follows:
the coating is made on a glass sample plate or a sand-blasting steel plate, and is soaked in 60 percent of sulfuric acid solution, 20 percent of hydrofluoric acid solution, 30 percent of sodium carbonate and 30 percent of salt water respectively after seven days, and is taken out after 15 days or 20 days, and the coating is not foamed, cracked and discolored; after boiling for 6 hours, the coating has no bubbling, cracking and discoloration and exceeds the standard test of seawater resistance. The specific test results of the environment-friendly underwater special anti-corrosion coating are shown in the following table 8:
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. The environment-friendly underwater special anticorrosive coating is characterized by comprising the following components in parts by mass:
35-50 parts of silicone resin;
7-10 parts of nano polytetrafluoroethylene;
coating a powder material by 30-35;
others are pigments and curing agents.
2. The environment-friendly underwater special anticorrosive coating according to claim 1, characterized in that: the ratio of the silicone resin to the nano polytetrafluoroethylene is 1: 0.2.
3. The environment-friendly underwater special anticorrosive coating according to claim 1, characterized in that: the PH values of the silicone resin, the nano polytetrafluoroethylene, the coating powder material, the pigment and the curing agent are all 7-8.
4. The environment-friendly underwater special anticorrosive coating according to claim 1, characterized in that: the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment are mixed into a component A, and the curing agent is a component B, so that the component A is as follows: the component B is 100: 30.
5. The environment-friendly underwater special anticorrosive coating according to claim 1, characterized in that: the silicone resin is any one of solvent-free pure silicone resin and solvent-free organic silicon epoxy resin.
6. The environment-friendly underwater special anticorrosive coating according to claim 1, characterized in that: the nano polytetrafluoroethylene adopts any one of nano silicon modified polytetrafluoroethylene and nano vermiculite modified polytetrafluoroethylene.
7. The environment-friendly underwater special anticorrosive coating according to claim 1, characterized in that: the pigment is any one of graphene, nano carbon black, inorganic black and copper-chromium black, and the parts of the pigment are 5-6 parts by mass.
8. The environment-friendly underwater special anticorrosive coating according to claim 1, characterized in that: the pigment is any one of nano iron oxide red, permanent red and inorganic molybdenum chromium red, and the parts of the pigment are 7-9 by mass.
9. The environment-friendly underwater special anticorrosive coating according to claim 1, characterized in that: the curing agent is any one of polyamide curing agent, cardanol 3115 and fatty amine.
10. The preparation method of the environment-friendly underwater special anticorrosive coating as claimed in claim 1, characterized by comprising the following specific preparation steps:
step 1, preparing all components of a coating according to parts by mass: 35-50 parts of silicone resin, 7-10 parts of nano polytetrafluoroethylene, 30-35 parts of coating powder material, pigment and curing agent;
step 2, independently coating the silicone resin and the pigment in the step 1 by using the coating powder material in the step 1;
step 3, mixing and stirring the silicone resin, the nano polytetrafluoroethylene, the coating powder material and the pigment in the step 2 to form a component A, stirring the curing agent to form a component B, wherein the component A comprises the following components: the component B is 100: 30;
step 4, grinding and dispersing the component A in the step 3 at a high speed and synthesizing to obtain a component A which is uniformly mixed and has qualified grinding fineness;
and 5, slowly pouring the component B in the step 3 into the component A in the step 4, stirring for 1-3 minutes, and curing for 8-10 minutes to obtain the environment-friendly underwater special anticorrosive coating.
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