CN-118755349-B - Temporary anti-fouling paint capable of automatically falling off and stripping and preparation method thereof

Abstract

The invention belongs to the technical field of chemical materials, and particularly relates to a temporary anti-fouling paint capable of automatically falling off and stripping and a preparation method thereof. The epoxy resin and the zinc acrylate resin are matched in proportion in the paint formula, so that the paint has good matching adhesion performance with the acrylic anti-fouling paint in a dry state. Meanwhile, when the coating is immersed in water to absorb water and dried in a secondary upper row, the coating is cracked by itself due to higher brittleness and is peeled off from the surface of the lower main antifouling coating. Or after normal cleaning operation of normal pressure fresh water flushing and other normal ship outer plates, the ship outer plates can be completely peeled off. The anti-fouling paint disclosed by the invention is applied to the field of ship construction or maintenance, so that the cost expenditure during paint construction can be reduced, the actual service life and anti-fouling effect of the anti-fouling paint can be prolonged, and better economic benefits are achieved.

Inventors

• Liu Dielong
• LIN JIANCONG
• ZHAO JIANNAN
• SU JINGYANG
• YANG ZHIQIANG

Assignees

• 厦门双瑞船舶涂料有限公司

Dates

Publication Date

20260508

Application Date

20240723

Claims (9)

1. 1. A temporary anti-fouling paint capable of automatically falling off and stripping is characterized by comprising the following components of zinc acrylate resin, bisphenol A epoxy resin, acrylic resin, anti-fouling agent, filler, pigment, auxiliary agent and solvent; The weight ratio of the bisphenol A type epoxy resin to the acrylic resin is 2-3:1 , , and the weight ratio of the sum of the masses of the acrylic resin and the acrylic resin to the bisphenol A type epoxy resin is 1:1-1.5 ; The bisphenol A type epoxy resin has a number average molecular weight of 5000-6000g/mol and an epoxy equivalent of 180-250g/eq, the zinc content of the zinc acrylate resin accounts for 8-12% of the weight of the resin, the number average molecular weight of the acrylic resin is 2000-4000g/mol, and the acid value of the acrylic resin is 3-5 mgKOH/g.
2. 2. The self-peeling temporary antifouling paint according to claim 1, which is characterized by comprising, by weight, 5-15 parts of zinc acrylate resin, 15-25 parts of bisphenol A type epoxy resin, 7-13 parts of acrylic resin, 15-40 parts of an antifouling agent, 5-30 parts of a filler and pigment, 1-3 parts of an auxiliary agent and 10-25 parts of a solvent.
3. 3. The temporary antifouling paint capable of self-peeling according to claim 1, wherein said antifouling agent is one or two of cuprous oxide, cuprous thiocyanate, copper pyrithione, zinc pyrithione, zineb, bromopyrrole, isothiazolinone.
4. 4. The self-releasing strippable temporary antifouling paint according to claim 1, wherein said pigment comprises at least one of extender pigment and coloring pigment.
5. 5. The temporary stain repellent according to claim 4, wherein the coloring pigment is one or more of titanium dioxide, red iron oxide, black iron oxide, yellow iron oxide, ultramarine, carbon black, red scarlet powder, toluidine red, chrome yellow, phthalocyanine blue and phthalocyanine green.
6. 6. The temporary stain repellent according to claim 4, characterized in that the extender pigment is one or more of talc, precipitated barium sulfate, mica powder, wollastonite powder, light calcium carbonate, kaolin, zinc oxide, quartz powder and feldspar powder.
7. 7. The self-peeling temporary antifouling paint according to claim 1, wherein the auxiliary agent is one or two of hydrogenated castor oil, polyamide wax, organobentonite, fumed silica, polyethylene wax and aluminum stearate.
8. 8. The temporary stain repellent according to claim 7, characterized in that the solvent is one or more of xylene, toluene, ethylbenzene, hexane, heptane, cyclohexane, butanol, isopropanol, ethylene glycol monomethyl ether, butyl acetate, and ethylene glycol monomethyl ether acetate.
9. 9. A method for preparing the temporary antifouling paint capable of self-peeling according to any one of claims 1 to 8, comprising the steps of: Step a, zinc acrylate resin, bisphenol A epoxy resin and acrylic resin are put into a drawing cylinder, and are dispersed uniformly at a high speed, and the rotating speed is 1000-1500 r/min; Step b, adding an antifouling agent, pigment, an auxiliary agent and a solvent except cuprous oxide for sanding; And c, sanding for 1h until the fineness is smaller than 80 mu m, adding cuprous oxide, dispersing uniformly at high speed, rotating at 1000-1500 r/min r/min, and discharging to obtain the temporary anti-fouling paint capable of self-falling and stripping.

Description

Temporary anti-fouling paint capable of automatically falling off and stripping and preparation method thereof Technical Field The invention belongs to the technical field of chemical materials, and particularly relates to a temporary anti-fouling paint capable of automatically falling off and stripping and a preparation method thereof. Background Marine fouling organisms are a class of biological species that grow attached to artificial structures such as ships, mainly including barnacles, oysters, mussels, seaweeds, marine bacteria, and the like, and have a great harm to the artificial structures. Taking a large ocean vessel as an example, once the fouling organisms attach, the attachment amount in half a year can reach 150kg/m2, and the total amount of the fouling attached to the surface of about 4 ten thousand square meters underwater can reach 6 kilotons. The huge fouling adhesion quantity not only increases the dead weight of the ship body, but also changes the streamline structure of the ship body, increases the sailing resistance of the ship body, and greatly increases the fuel consumption. In addition, fouling organisms can cause the deterioration of the maneuvering performance of the ship, the reduction of the propulsion efficiency of the propeller, the increase of noise and the interference of sonar, force the ship to be docked in advance for cleaning, and have great expense on maintenance and repair, thereby seriously affecting the service and fight of the ship. At present, methods for preventing fouling organisms from adhering mainly comprise a mechanical cleaning method, an electrolytic seawater method and an anti-fouling coating method, wherein the anti-fouling coating method is the most convenient and widely applied method. Therefore, the marine antifouling material becomes a research hotspot of research institutions at home and abroad. At present, in the mainstream ship repairing and building process of various large shipyards in China, the conditions of ship undocking and water entering, berthing and quay outfitting are all existed. The outfitting time span is larger, and varies from a few days to a few months, and even reaches more than 6 months. After the ship outfitting is finished, part of ships can reenter the dock or the slipway for construction operation of repairing and building the ship due to various problems. The practical performance of the antifouling coating can be affected in the construction process of secondary upper discharge of ships, and the aspects of shortened antifouling period, poor interlayer adhesion between the final system spray coating and the original coating and the like are reflected. In the secondary upper discharge process, the coated antifouling coating is adversely affected. The main aspects are as follows: The first antifouling coating can generate ion exchange process in water to release antifouling agent, the surface coating which has generated ion exchange to release the antifouling agent can not be dissolved in water through self-polishing effect because of no water flow scouring process when the ship is outfitted in water, so that the antifouling paint on the surface layer can not be dissolved in water, after the water is re-filled, the antifouling capability is reduced, the probability of fouling organism adhesion is obviously improved, and when fouling organism adhesion occurs, the attached fouling organism can obviously influence the antifouling agent release effect of the subsequent coating, thereby influencing the integral antifouling effect. And the second upper discharge antifouling coatings have a large amount of dirt on the surfaces, if the ship plans to carry out the uniform spraying work of the antifouling coatings under the waterline again, the surfaces of the coatings need to be cleaned, a normal-pressure fresh water flushing mode is generally adopted, and after the flushing is finished, the first antifouling paint is sprayed again. However, even if the coating is flushed by normal-pressure fresh water, the adhesion between the coating and the coating sprayed by a new system cannot achieve the effect of original drying of the coating in an environment without soaking in water. It is often found that after the ship is discharged on the site of ship building, the surface anti-fouling coating falls off in a large area, and most of the fallen coating is a first-degree anti-fouling paint sprayed again on the ship after the ship is discharged for the second time, as shown in fig. 1. Patent CN201810439493.7 provides an environment-friendly water paint for temporary protection of copper-containing anti-fouling coating surface, which can be dissolved in water to prolong the overall anti-fouling effect of the anti-fouling coating, but the product of the patent achieves the purpose of prolonging the overall anti-fouling effect of the anti-fouling coating only by inhibiting the release of the anti-fouling agent of the main anti-fouling coating. Th