CN111621182A - Connecting coating matched with fouling release type antifouling paint and preparation method thereof - Google Patents
Connecting coating matched with fouling release type antifouling paint and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1693—Antifouling paints; Underwater paints as part of a multilayer system
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
- C09D5/1675—Polyorganosiloxane-containing compositions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1687—Use of special additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
Abstract
The invention has introduced a fouling release type antifouling paint and used the connection coating and its preparation method, the connection coating takes place the curing reaction with top coat, bottom coat separately and connects; the connecting coating matched with the fouling release type antifouling paint comprises a component A, a component B and a component C, wherein the component A comprises amino silicone oil and hydroxyl silicone oil; the component B comprises a silane coupling agent; the third component is isocyanate; the preparation method of the connecting paint is prepared by adopting a high-speed dispersion method. The connecting coating is used for improving the interlayer adhesion between an antirust base coating and a low-surface-energy antifouling coating, and the design of the connecting coating is based on a substrate coating and an antifouling material curing mechanism, and the interface of a matched connecting layer is reversely introduced to connect active groups, so that the matched coatings are connected together by an interface chemical bonding method, the interface adhesion is improved, and the service life of an anticorrosive antifouling coating system is prolonged.
Description
Technical Field
The invention belongs to the technical field of chemical materials, and particularly relates to antifouling matching connecting paint taking amino silicone oil as a main base material and a preparation method thereof.
Background
The traditional antifouling paint mainly utilizes release of an antifouling agent to inhibit attachment of fouling organisms, but the antifouling agent has a certain destructive effect on marine ecology, and with the enhancement of environmental awareness of countries in the world, development of low-toxicity or nontoxic antifouling paint becomes a development trend of future antifouling paint, wherein novel environment-friendly antifouling paint represented by fouling release type antifouling paint is widely applied due to excellent antifouling performance. The fouling release type antifouling paint mainly uses organic silicon resin as a base material, and a matched primer coat of the fouling release type antifouling paint is an antirust primer taking epoxy resin as the base material, but because the structural and performance of resin used by the primer coat and the resin used by the top coat are greatly different, the matching connection performance between the two materials is poor, and the antifouling paint is easy to fall off. Therefore, a connecting coating needs to be coated between the base coating and the surface coating, so that the antifouling and anticorrosive coatings can be connected, and the adhesion between the coatings can be enhanced.
The different antifouling coatings are matched with different connecting coating systems, for example, the connecting paint of the chlorinated rubber antifouling paint used at present takes chlorinated rubber as a base material, and the connecting paint of the zinc acrylate self-polishing antifouling paint takes epoxy acrylate resin as a base material. At present, commercial fouling release type antifouling paints on the market are few in types, the product technology is mostly mastered by several foreign manufacturers, and SeaLion Topulse series organosilicon low-surface-energy antifouling paints developed by Jotun coating company in Norway are composed of three components. The matched connecting paint SeaLion Tiecoat is also composed of three components, wherein the component A is a base material, the component B is a curing agent, the component C is an accelerator, the curing volume ratio of the three components is 16.7:0.6:0.9, but the information does not show which resin is adopted by the connecting paint.
Through retrieval, a patent application with the Chinese patent application number of 201410177662.6 and the application publication date of 2014, 8 and 6 discloses an epoxy connecting paint used for an antirust and antifouling transition layer at a part below a ship waterline. The resin base material of the patent is compounded by epoxy resin and epichlorohydrin or vinyl chloride-vinyl acetate resin. The applicant discloses a patent with application number 201711238666.0 in 2018, 5, 15 and a preparation method thereof, wherein the application number is 201711238666.0, the name is an epoxy acrylic acid connecting paint for ships and a preparation method thereof, but antifouling paints applicable to the connecting paint disclosed by the two patents are mainly abrasion type or self-polishing type antifouling paints, the matching performance of the antifouling paints with organic silicon fluorine resin as a base material is poor, and phenomena such as paint film foaming and the like are easy to occur after soaking.
The applicant applies for 5, 15 and 2018 to disclose a patent with application number 201610730129.7, namely an epoxy acrylic acid connecting paint for ships and a preparation method thereof, wherein the connecting paint of the patent is an organic silicon epoxy connecting paint matched with a fouling release type antifouling paint, the strength of a connecting layer is high after curing, the matching adhesion of the connecting layer and a primer is good, but the matching adhesion of the connecting paint and the fouling release type antifouling paint is poor, and the connecting paint is easy to foam after being soaked in seawater.
Therefore, the development of a connection coating of a fouling release type antifouling paint which is matched with an organic silicon fluororesin as a base material is a problem which needs to be solved at present.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem of poor connection performance between the existing connection coating and the bottom coating and the top coating, in particular to the problem of poor connection performance between the existing connection coating and the fouling release type antifouling coating and the epoxy antirust bottom coating and the phenomenon of serious foaming after soaking, the invention improves the interlayer adhesion between the antirust bottom coating and the fouling release type antifouling coating, simultaneously improves the soaking resistance of the matched coating and ensures the effective exertion of the performance of the antifouling coating by optimizing the formula composition of the connection paint.
The invention also provides a preparation method of the connecting coating matched with the fouling release type antifouling paint, and aims to prepare the connecting coating.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the connecting coating is applied between the top coating and the bottom coating, and the connecting coating respectively generates interfacial curing reaction with the top coating and the bottom coating, wherein the interfacial curing reaction is the reaction of isocyanate with hydroxyl and amino, and/or the reaction of alkoxy with silicon hydroxyl, namely the interfacial curing reaction between the connecting coating and the top coating is the reaction of isocyanate with hydroxyl and amino, and/or the reaction of alkoxy with silicon hydroxyl, the direct interfacial curing reaction between the connecting coating and the bottom coating is also the reaction of isocyanate with hydroxyl and amino, and/or the reaction of alkoxy with silicon hydroxyl, so that the interface bonding between the connecting coating and the top coating, and between the connecting coating and the bottom coating are respectively realized, and the good connection between the connecting coating and the bottom coating and the top coating is realized. Preferably, the curing reaction between the linking paint and the top coat is the reaction of alkoxy in the linking paint and silicon hydroxyl in the antifouling coat, and the curing reaction between the linking paint and the base coat is the reaction of isocyanate in the linking paint and hydroxyl and amino in the base coat.
Preferably, a connecting coating matched with the fouling release type antifouling paint is applied between a fouling release type antifouling top coating and an epoxy antirust bottom coating, and the connecting coating is respectively subjected to curing reaction with the top coating and the bottom coating, wherein the curing reaction between the connecting coating and the bottom coating is the reaction of isocyanate in the connecting coating and hydroxyl and amino in the bottom coating, and the curing reaction between the connecting coating and the antifouling top coating is the reaction of alkoxy in the connecting coating and silicon hydroxyl in the antifouling coating, so that the interface bonding between the connecting coating and the top coating and the interface bonding between the connecting coating and the bottom coating are respectively realized, and the good connection between the connecting coating and the bottom coating and the top coating is realized.
A connecting coating matched with fouling release type antifouling paint comprises a component A, a component B and a component C, wherein the component A comprises amino silicone oil and hydroxyl silicone oil; the component B comprises a silane coupling agent; the component C is isocyanate.
Furthermore, the mass ratio of the component A to the component B to the component C is (4-10): 1-3): 1.
Further, the mass ratio of the component A, the component B and the component C is preferably 8:2: 1.
Further, the component A also comprises a pigment, a filler, a thixotropic agent and a solvent, and the component A comprises the following components in parts by weight:
10-40 parts of amino silicone oil;
5-15 parts of hydroxyl silicone oil;
14-23 parts of pigment and filler;
1-2 parts of a thixotropic agent;
10-20 parts of a solvent;
the component B also comprises a catalyst and a solvent, and the component B comprises the following components in parts by mass:
5-10 parts of a silane coupling agent;
1-2 parts of a catalyst;
4-18 parts of a solvent.
Further, the amino silicone oil is polymethyl siloxane containing amino at two ends, and the molecular structural formula is as follows:
the hydroxyl silicone oil is polymethyl siloxane containing hydroxyl at two ends, and the molecular structural formula is as follows:
the viscosity of the amino silicone oil and the viscosity of the hydroxyl silicone oil are both 1000-10000 cP.
Further, the pigment and filler is one or more of mica powder, talcum powder, light calcium carbonate, titanium dioxide, precipitated barium sulfate, carbon black and iron black; the thixotropic agent is one or more of polyamide wax, organic bentonite and fumed silica.
Further, the silane coupling agent is one or more of ethyl silicate 28, ethyl silicate 32, ethyl silicate 40 and gamma-glycidyl ether oxypropyltrimethylsilane (KH560), wherein the ethyl silicate 28 accounts for 28-30% of the content of silicon dioxide, the ethyl silicate 32 accounts for 32-34% of the content of silicon dioxide, and the ethyl silicate 40 accounts for 40-42% of the content of silicon dioxide; the catalyst is one or more of stannous octoate and dibutyltin dilaurate; the solvent is one or more of dimethylbenzene, butyl acetate, cyclohexanone and ethyl acetate.
Further, the isocyanate is one or more of N3390, N75, Hexamethylene Diisocyanate (HDI), Toluene Diisocyanate (TDI) and diphenylmethane diisocyanate (MDI).
Furthermore, the mass ratio of the component A to the component B to the component C is (4-10): 1-3): 1.
Further, the mass ratio of the component A, the component B and the component C is preferably 8:2: 1.
A preparation method of a connecting coating matched with fouling release type antifouling paint comprises the following steps:
(1) preparation of the component A: dispersing amino silicone oil, hydroxyl silicone oil and a solvent at a high speed, adding a pigment and filler for continuous dispersion, and finally adding a thixotropic agent for dispersion until the fineness is reduced to below 80 mu m to obtain a component A;
(2) preparation of the component B: dispersing the silane coupling agent, the catalyst and the solvent uniformly at a high speed to obtain a component B:
(3) preparation of the connecting coating: uniformly stirring the component A, the component B and the component C isocyanate according to the mass ratio of (4-10) to (1-3) to 1 to obtain the connecting coating.
Specifically, the method comprises the following steps:
(1) preparation of the component A: the high-speed dispersion method is adopted to produce and prepare the component A and the component B, and the preparation process comprises the following steps: according to the mass parts, 10-40 parts of amino silicone oil, 5-15 parts of hydroxyl silicone oil and 10-20 parts of solvent are added into a dispersion pulling cylinder, high-speed dispersion is carried out for 10min at the rotating speed of 1000-2000 r/min, 14-23 parts of pigment and filler are added, high-speed dispersion is carried out for 4h at the rotating speed of 1000-2000 rpm, 1-2 parts of thixotropic agent is added, high-speed dispersion is carried out for 2h at the rotating speed of 1000-2000 rpm, and when the fineness of the coating is reduced to be below 80 mu m, the material can be filtered and discharged to obtain a component A;
(2) preparation of the component B: adding 5-10 parts of silane coupling agent, 1-2 parts of catalyst and 4-18 parts of solvent into a dispersion pulling cylinder, dispersing at a high speed of 500-2000 rpm for 5min, and discharging after the materials are uniformly dispersed to obtain a component B;
(3) preparation of the connecting coating: when the connecting paint is used, the component A, the component B and the component C are blended according to the mass ratio of (4-10) to (1-3) to 1, construction can be carried out after uniform stirring, and the connecting paint can be constructed by adopting construction processes such as brushing, roller coating, high-pressure airless spraying, air spraying and the like.
Further, in the step (3), a preferable ratio of the mass ratio of the component A, the component B and the component C is 8:2: 1.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the connecting coating of the invention has curing reaction with the surface coating and the bottom coating to obtain the surface coating and the bottom coating which are respectively connected in an interface bonding mode, so that the connecting performance of the surface coating and the bottom coating is enhanced, and the problems of foaming, falling off and the like of the coating caused by poor compatibility of the bottom coating and the surface coating can be effectively reduced;
(2) the connecting coating matched with the fouling release type antifouling paint is a connecting coating matched with an organic silicon low-surface-energy antifouling coating, the connecting performance with a bottom coating material and a top coating material is improved through an interface chemical bonding design, and the problems of foaming, falling off and the like of the coating caused by poor compatibility of the bottom coating and the top coating can be effectively reduced; the connecting coating adopts amino silicone oil as a main base material to be compounded with hydroxyl silicone oil, the compound is used as the base material, the isocyanate and the silane coupling agent are simultaneously used for curing, the compound curing agent is used for curing the connecting coating, good connection is realized in a mode of interfacial chemical bonding between the connecting paint and the primer as well as between the connecting paint and the antifouling paint, the adhesive force between the connecting paint and the antifouling coating with the epoxy primer and the antifouling coating with the fouling release type can be greatly improved, the used raw materials are rich in source, the synthesis process is simple and controllable, and the product has better market competitiveness, so that the connecting coating has better potential application value;
(3) the invention develops the antifouling matching connecting coating taking amino silicone oil as a main base material, which is used for improving the interlayer adhesion between an antirust priming coat and a low-surface-energy antifouling coating; the connecting coating adopts the compound resin of amino silicone oil and hydroxyl silicone oil as a base material and isocyanate and a silane coupling agent as a curing agent, so that matched coatings are connected together by an interface chemical bonding method, the interface adhesive force is improved, and the service life of an anticorrosion and antifouling coating system is prolonged;
(4) the organic silicon connecting paint is based on a base coating and an antifouling material curing mechanism, a compound of amino silicone oil and hydroxyl silicone oil is used as a resin base material, a silane coupling agent and isocyanate are used as curing agents, and the compound is reversely introduced into the interface of a matched connecting layer to connect active groups, so that the matched coatings are connected together by an interface chemical bonding method, the interface adhesive force is improved, and the service life of an anticorrosion antifouling coating system is prolonged;
(5) the interface bonding process of the connecting coating formed by the connecting coating matched with the fouling release type antifouling paint, the epoxy coating and the antifouling coating material is as follows: amino silicone oil and hydroxyl silicone oil in the component A react with isocyanate under the action of a catalyst to perform a curing reaction, and simultaneously the isocyanate can also react with hydroxyl and amino in the resin of the primer layer (the primer layer is antirust paint taking epoxy resin as a base material, an amine compound is a curing agent, the epoxy resin contains hydroxyl, and the cured resin contains amino), so that the interface bonding of the connecting coating and the primer layer is realized; the hydroxyl silicone oil and the amino silicone oil in the component A have a curing reaction with the silane coupling agent under the action of the catalyst, and meanwhile, the silane coupling agent can react with the hydroxyl silicone resin in the antifouling surface coating (the fouling release type antifouling paint mainly takes the hydroxyl silicone resin as a base material), so that the interface bonding of the connecting coating and the antifouling coating is realized, and the good connection between the connecting coating and the primer coating and the surface coating is realized.
Drawings
FIG. 1 is a sample plate of a matching coating of a comparative example epoxy silicone jointing paint soaked in fresh water for 3 months;
FIG. 2 is a sample of a mating coating of a silicone tie coat of example 4 of the present invention soaked in fresh water for 3 months.
Detailed Description
The invention is further described with reference to specific examples.
The connecting coating is coated between the top coating and the bottom coating, and the connecting coating respectively generates curing reaction with the top coating and the bottom coating, so that interface bonding is respectively generated between the connecting coating and the top coating and between the connecting coating and the bottom coating, and good connection between the connecting coating and the bottom coating and the top coating is realized.
In order to better describe the formula of the connection coating, the invention provides a connection coating matched with fouling release type antifouling paint, which only aims at the matched coating between the fouling release type antifouling coating taking organic silicon resin as a base material and an antirust coating taking epoxy resin as a base material, wherein the connection coating comprises a component A, a component B and a component C, and the component A comprises amino silicone oil and hydroxyl silicone oil; the component B comprises a silane coupling agent; the third component is isocyanate; the mass ratio of the component A to the component B to the component C is (4-10): 1-3): 1, and preferably the mass ratio of the component A to the component B to the component C is 8:2: 1.
In order to prepare the connecting coating matched with the fouling release type antifouling paint with more excellent performance, additives are added into each component to adapt to each use condition of the coating, particularly the use in marine environment, and the specific formula of the connecting coating is as follows: the component A comprises amino silicone oil, hydroxyl silicone oil, pigment and filler, a thixotropic agent and a solvent; the mixture ratio is shown in table 1;
TABLE 1 Material proportions of the first component of the jointing varnish of the present invention
| Raw materials | Parts by mass |
| Amino silicone oil | 10～40 |
| Hydroxy silicone oil | 5-15 |
| Pigment and filler | 14～23 |
| Thixotropic agent | 1～2 |
| Solvent(s) | 10～20 |
The component B comprises a silane coupling agent, a catalyst and a solvent, and the proportion of the components is shown in Table 2;
TABLE 2 Material proportions of the B component of the tie coats of the invention
| Raw materials | Parts by mass |
| Silane coupling agent | 5～10 |
| Catalyst and process for preparing same | 1～2 |
| Solvent(s) | 4～18 |
The third component is isocyanate; the mass ratio of the component A to the component B to the component C is (4-10): 1-3): 1, and preferably the mass ratio of the component A to the component B to the component C is 8:2: 1.
A preparation method of a connecting coating matched with fouling release type antifouling paint comprises the following steps:
(1) preparation of the component A: the high-speed dispersion method is adopted to produce and prepare the component A and the component B, and the preparation process comprises the following steps: according to the mass parts, 10-40 parts of amino silicone oil, 5-15 parts of hydroxyl silicone oil and 10-20 parts of solvent are added into a dispersion pulling cylinder, high-speed dispersion is carried out for 10min at the rotating speed of 1000-2000 r/min, 14-23 parts of pigment and filler are added, high-speed dispersion is carried out for 4h at the rotating speed of 1000-2000 rpm, 1-2 parts of thixotropic agent is added, high-speed dispersion is carried out for 2h at the rotating speed of 1000-2000 rpm, and when the fineness of the coating is reduced to be below 80 mu m, the material can be filtered and discharged to obtain a component A;
(2) preparation of the component B: adding 5-10 parts of silane coupling agent, 1-2 parts of catalyst and 4-18 parts of solvent into a dispersion pulling cylinder, dispersing at a high speed of 500-2000 rpm for 5min, and discharging after the materials are uniformly dispersed to obtain a component B;
(3) preparation of the connecting coating: when the connecting paint is used, the component A, the component B and the component C are blended according to the mass ratio of (4-10) to (1-3) to 1, construction can be carried out after uniform stirring, and the connecting paint can be constructed by adopting construction processes such as brushing, roller coating, high-pressure airless spraying, air spraying and the like.
The invention is further illustrated by the following examples and comparative examples, the formulations of which are given in Table 3, wherein the amounts of substances added are in parts by mass.
TABLE 3 examples 1-4 and comparative example tie coat formulations
It is worth to be noted that the above examples are all lists of the optimal effect formula of the coating, and in the actual production process, the pigment and filler is one or more of mica powder, talcum powder, light calcium carbonate, titanium dioxide, precipitated barium sulfate, carbon black and iron black; the thixotropic agent is one or more of polyamide wax, organic bentonite and gas-phase silicon dioxide; the silane coupling agent is one or more of ethyl silicate 28, ethyl silicate 32, ethyl silicate 40 and gamma-glycidyl ether oxypropyltrimethylsilane, and particularly the ethyl silicate 32 and the ethyl silicate 28 have similar structures, so the effect is similar in the invention; the catalyst is one or more of stannous octoate and dibutyltin dilaurate; the solvent is one or more of dimethylbenzene, butyl acetate, cyclohexanone and ethyl acetate; the isocyanate is one or more of N3390, N75, hexamethylene diisocyanate, toluene diisocyanate and diphenylmethane diisocyanate; the effects are similar and all belong to the technical solutions and effects predictable by those skilled in the art according to the above embodiments, and are not listed here to avoid redundancy.
Performance testing
After the connecting coating matched with the fouling release type antifouling paint is obtained, the coating process between the connecting coatings of the embodiments 1 to 4 and the comparative examples and the antifouling top coating and the antirust bottom coating is as follows:
the steel substrate is used as a substrate, an air-spraying coating method is adopted to carry out spraying preparation of the epoxy anti-rust primer, the thickness of a primer coating dry film is about 200 mu m, and the primer is cured for 1 day and then is dried; preparing a connecting coating by adopting an air-jet coating method, wherein the thickness of a dry film of the connecting coating is about 50 mu m, and the connecting coating is cured for 1 day and then is dried; the antifouling coating is prepared by adopting an air-jet coating method, the dry film thickness of the antifouling coating is about 100 mu m, and the correlation performance test is carried out after the antifouling coating is cured for one week.
The steel sheet obtained by the above coating process was subjected to the following performance tests.
(1) Adhesion of matched coating
Examples 1-4 silicone jointing paints and comparative jointing paints based on epoxy silicone resins, see the corresponding formulations in table 3. The matched adhesion with epoxy primer and fouling release type low-surface-energy antifouling paint is inspected, the epoxy primer adopts H44-61 epoxy antirust primer (red) of Xiamen Shuangrui paint company, the antifouling paint adopts self-made FG-009 fouling release type antifouling paint (red), the coating interval of matched coatings is 1 day, GB/T5210-:
TABLE 4 adhesion of the mating coatings
In the table, 100% C indicates 100% cohesive failure of the tie coat; 80% C indicates 80% cohesive failure, 20% interfacial failure of the tie coat; 100% D represents 100% cohesive failure of the antifouling paint; 10% D indicates 10% cohesive failure and 90% interfacial failure of the antifouling paint.
As can be seen from the data in the table, the adhesion between the organosilicon connecting paint and the primer in the embodiments 1-4 of the invention is basically between 2.5 MPa and 3.0MPa and is basically the cohesive failure of the connecting paint, and the adhesion between the connecting paint and the antifouling paint is basically between 1 MPa and 2MPa and is basically the cohesive failure of the antifouling paint, which shows that the interface adhesion between the connecting paint and the primer and the antifouling paint is good. And interface fracture of a larger area occurs between the epoxy organosilicon connecting paint and the antifouling paint serving as a comparison group, which shows that the interface connecting performance between the epoxy organosilicon connecting paint and the antifouling paint of the comparison group is poor.
(2) Fresh water soaking resistance of matched coating
The fresh water soaking resistance of the organic silicon connecting paints in the examples 1-4 and the epoxy organic silicon connecting paint in the comparative example and the matched coating are respectively inspected, the primer adopts epoxy antirust primer, the antifouling paint adopts fouling release type antifouling paint, the matched coating is soaked in fresh water for 3 months, and whether the surface of the matched coating foams, cracks or falls off is observed. All the steel plates obtained by coating in the embodiments 1 to 4 have good fresh water soaking resistance, and by taking the steel plate in the embodiment 4 as an example, and taking the photographs of fresh water soaking for 3 months in the comparative example and the embodiment 4 as figures 1 and 2 respectively, it can be found that the epoxy organic silicon connecting paint is used as a matched coating, a large-area foaming phenomenon occurs on the surface of a sample plate after the sample plate is soaked for 3 months, and the matched connecting performance is poor; the organosilicon jointing paint of the embodiment 4 of the invention is used as a matching coating, and the obtained sample plate has a perfect surface after being soaked for 3 months, has no foaming, cracking or shedding phenomena, has good matching performance and has good fresh water soaking resistance.
It is worth noting that if the osmotic pressure of fresh water is higher than that of brine, and if the fresh water soaking resistance test can be passed, the brine resistance performance can also be passed, and the brine resistance test is not performed here.
Claims (10)
1. A jointing coating applied between a top coat and a base coat, characterized in that: the connecting coating respectively generates interface curing reaction with the top coating and the bottom coating, wherein the interface curing reaction is the reaction of isocyanate and hydroxyl, amino, and/or the reaction of alkoxy and silicon hydroxyl.
2. A connecting coating matched with fouling release type antifouling paint is characterized in that: the high-temperature-resistant polyurethane coating comprises a component A, a component B and a component C, wherein the component A comprises amino silicone oil and hydroxyl silicone oil; the component B comprises a silane coupling agent; the component C is isocyanate.
3. The antifouling paint as set forth in claim 2, wherein: the mass ratio of the component A to the component B to the component C is (4-10): 1-3): 1.
4. The antifouling paint as set forth in claim 2, wherein: the mass ratio of the component A to the component B to the component C is 8:2: 1.
5. The antifouling paint as set forth in claim 2, wherein: the component A also comprises a pigment, a filler, a thixotropic agent and a solvent, and the component A comprises the following components in parts by weight:
10-40 parts of amino silicone oil;
5-15 parts of hydroxyl silicone oil;
14-23 parts of pigment and filler;
1-2 parts of a thixotropic agent;
10-20 parts of a solvent;
the component B also comprises a catalyst and a solvent, and the component B comprises the following components in parts by mass:
5-10 parts of a silane coupling agent;
1-2 parts of a catalyst;
4-18 parts of a solvent.
6. The antifouling paint as set forth in claim 5, wherein: the amino silicone oil is polymethyl siloxane with amino groups at two ends, the hydroxyl silicone oil is polymethyl siloxane with hydroxyl groups at two ends, and the viscosity of the amino silicone oil and the viscosity of the hydroxyl silicone oil are both 1000-10000 cP.
7. The antifouling paint as set forth in claim 5, wherein: the pigment and filler is one or more of mica powder, talcum powder, light calcium carbonate, titanium dioxide, precipitated barium sulfate, carbon black and iron black; the thixotropic agent is one or more of polyamide wax, organic bentonite and fumed silica.
8. The antifouling paint as set forth in claim 5, wherein: the silane coupling agent is one or more of ethyl silicate 28, ethyl silicate 32, ethyl silicate 40 and gamma-glycidyl ether oxypropyltrimethylsilane; the catalyst is one or more of stannous octoate and dibutyltin dilaurate; the solvent is one or more of dimethylbenzene, butyl acetate, cyclohexanone and ethyl acetate.
9. The connection coating for fouling release type antifouling paint according to any one of claims 2 to 8, wherein: the isocyanate is one or more of N3390, N75, hexamethylene diisocyanate, toluene diisocyanate and diphenylmethane diisocyanate.
10. A preparation method of a connecting coating matched with fouling release type antifouling paint is characterized by comprising the following steps: the method comprises the following steps:
(1) preparation of the component A: dispersing amino silicone oil, hydroxyl silicone oil and a solvent at a high speed, adding a pigment and filler for continuous dispersion, and finally adding a thixotropic agent for dispersion until the fineness is reduced to below 80 mu m to obtain a component A;
(2) preparation of the component B: dispersing the silane coupling agent, the catalyst and the solvent uniformly at a high speed to obtain a component B:
(3) preparation of the connecting coating: uniformly stirring the component A, the component B and the component C isocyanate according to the mass ratio of (4-10) to (1-3) to 1 to obtain the connecting coating.
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| CN117045872A (en) * | 2023-10-13 | 2023-11-14 | 四川大学 | Corrosion-resistant composite coating, magnesium-based bracket containing corrosion-resistant composite coating and preparation method of magnesium-based bracket |
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