A kind of preservative for producing marine anticorrosive coating

Abstract

The present invention belongs to the technical field of marine anticorrosive coatings, and specifically relates to a preservative for producing marine anticorrosive coatings. A preservative for producing marine anticorrosive coatings, wherein the active ingredients of the preservative are compounded by geraniol and polyhexamethylene biguanide hydrochloride. The active ingredients of the preservative of the present invention are compounded by geraniol and polyhexamethylene biguanide hydrochloride in a certain mass ratio, which can improve the inhibitory effect on a variety of molds, and then effectively prevent the invasion of microorganisms, and ensure that no corruption or deterioration occurs during the production and storage of the coating; secondly, the amount of anticorrosive components used and the anticorrosive cost can be reduced, which can provide support for the production of marine anticorrosive coatings.

Description

Technical Field

[0001] The invention belongs to the technical field of marine anticorrosion coatings, and in particular relates to a preservative for producing marine anticorrosion coatings. Background Art

[0002] The ocean occupies about 70% of the earth's surface area, and it contains extremely rich seabed resources, such as oil, natural gas and various minerals. Marine anti-corrosion is one of the key technologies of marine engineering. Stress corrosion cracking, corrosion fatigue and intergranular corrosion caused by metal corrosion in the ocean can cause sudden fractures of marine steel structures, leading to ecological disasters in the marine environment and causing huge losses. Marine anti-corrosion coatings refer to anti-corrosion coatings used in marine environments. They are generally required to have the following properties: good physical properties, good impermeability to corrosive media, and good adhesion to steel surfaces; good mechanical properties, and resistance to seawater erosion, seawater, salt spray, oil, chemicals and ultraviolet rays.

[0003] There are also many marine anti-corrosion coatings disclosed in the prior art. However, marine anti-corrosion coatings, like other existing types of coatings, contain organic substances in their components. These organic substances provide basic conditions for the growth and reproduction of microorganisms. Under suitable conditions, the growth and reproduction of microorganisms will be promoted. In this process, the metabolites such as enzymes and organic acids produced by microorganisms will cause changes in the smell, color and viscosity of the coating, causing the product to deteriorate. Preservatives can inhibit the growth of microorganisms. Adding an appropriate amount of preservatives to the product can effectively prevent the invasion of microorganisms and ensure that the coating does not deteriorate during production and storage.

[0004] There are many kinds of preservatives on the market, such as BCM, OIT, IPBC, IPN (CLT) and DCOIT, etc. However, with the long-term use of single active ingredient of preservatives, many microorganisms have developed resistance to them, resulting in a gradual decrease in the inhibitory effect on various molds.

[0005] Different antiseptic components can be combined and compounded in different proportions. Those with synergistic effects can improve the inhibitory effect on mold, reduce dosage and reduce costs. CMIT / MIT+FR is a very commonly used combination compound, which has a high-efficiency and broad-spectrum bactericidal effect, but not any combination of two or more antiseptic components can achieve a synergistic effect.

[0006] The inventors found through indoor synergistic tests that the combination of geraniol and polyhexamethylene biguanide hydrochloride in a certain mass ratio can improve the inhibitory effect on a variety of molds, thereby effectively preventing the invasion of microorganisms and ensuring that the paint does not spoil during production and storage.

[0007] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0008] The purpose of the present invention is to provide a preservative for producing marine anticorrosive coatings, wherein the geraniol and polyhexamethylene biguanide hydrochloride in the active ingredients can improve the inhibitory effect on various molds when combined and compounded in a certain mass ratio, thereby effectively preventing the invasion of microorganisms and ensuring that the coating does not spoil during production and storage.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A preservative, wherein the effective ingredients of the preservative are compounded with geraniol and polyhexamethylene biguanide hydrochloride.

[0011] Preferably, the mass ratio of geraniol to polyhexamethylene biguanide hydrochloride is 1-5:19-1.

[0012] The invention also provides application of the preservative in producing marine anticorrosive coatings.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The effective ingredients of the preservative of the present invention are prepared by combining geraniol and polyhexamethylene biguanide hydrochloride in a certain mass ratio, which can improve the inhibitory effect on various molds, thereby effectively preventing the invasion of microorganisms and ensuring that no corruption or deterioration occurs during the production and storage of the coating; secondly, the amount of antiseptic components used and the antiseptic cost can be reduced, thereby providing support for the production of marine antiseptic coatings. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the technical solution of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Example :Efficacy test of geraniol and polyhexamethylene biguanide hydrochloride

[0017] 1. Test mold

[0018] Aspergillus niger

[0019] Aspergillus flavus

[0020] Paecilomyces variotii

[0021] Store in PDA medium for later use.

[0022] 2. Test agents: 98% geraniol technical (Shanghai Yuanye Biotechnology Co., Ltd.) and 95% polyhexamethylene biguanide hydrochloride technical (Shanghai Yuanye Biotechnology Co., Ltd.)

[0023] First, each original drug was dissolved in dimethyl sulfoxide, and then prepared into a single-dose stock solution with a 0.1% Tween-80 aqueous solution. Multiple groups of ratios were set up, and each single dose and each group of ratios were diluted with a 0.1% Tween-80 aqueous solution in an isotropic manner into 5 mass concentration gradients for use.

[0024] 3. Test method: Mycelium growth rate method (Mu Liyi 1994)

[0025] Mix 1 mL of the test agent with 9 mL of melted PDA medium and pour into a sterile culture dish to make a drug-containing plate. After the medium solidifies, place a mold cake (5 mm in diameter) in the center of the drug-containing plate, and use 0.1% Tween-80 aqueous solution as a control. Set up 3 replicates for each treatment. Place in an incubator and culture at 28±1℃ for 3 days. Measure the diameter of the mold colony growth using the cross method and calculate the inhibition rate.

[0026]

[0027] 4. Data Analysis

[0028] DPS software was used to perform regression analysis on the logarithmic value of the test agent concentration and the probability value of mycelium growth inhibition rate to calculate the EC of each treatment agent. 50 , and the co-toxicity coefficient (CTC value) of the mixture was calculated according to Sun Yunpei's method.

[0029] The synergistic effect of mixed drugs was evaluated according to the co-toxicity coefficient (CTC), that is, CTC≤80 was antagonistic, 80<CTC<120 was additive, and CTC≥120 was synergistic. The experimental results are shown in Table 1-3.

[0030] Table 1 Toxicity of the combination of geraniol (A) and polyhexamethylene biguanide hydrochloride (B) to Aspergillus niger

[0031]

[0032] As can be seen from Table 1, when the mass ratio of geraniol to polyhexamethylene biguanide hydrochloride is 1:19, it exhibits an additive effect on Aspergillus niger, and when it is in the range of 1-5:15-1, it exhibits a synergistic effect on Aspergillus niger.

[0033] Table 2 Toxicity of geraniol (A) and polyhexamethylene biguanide hydrochloride (B) to Aspergillus flavus

[0034]

[0035] As can be seen from Table 2, when the mass ratio of geraniol to polyhexamethylene biguanide hydrochloride is 1:1, it exhibits an additive effect on Aspergillus flavus, and when it is in the range of 1:19-5 and 5:1, it exhibits a synergistic effect on Aspergillus niger.

[0036] Table 3 Toxicity of the combination of geraniol (A) and polyhexamethylene biguanide hydrochloride (B) to Paecilomyces variotii

[0037]

[0038] As can be seen from Table 3, geraniol and polyhexamethylene biguanide hydrochloride showed synergistic effects on Paecilomyces variotii in the mass ratio range of 1-5:19-1.

[0039] In summary, the combination of geraniol and polyhexamethylene biguanide hydrochloride shows a synergistic effect on various molds such as Aspergillus niger, Aspergillus flavus and Paecilomyces variotii. Compared with a single anti-mold component, it can improve the inhibitory effect on various molds, thereby effectively preventing the invasion of microorganisms and ensuring that no corruption or deterioration occurs during the production and storage of the coating; secondly, it can reduce the amount of anti-corrosion components used and reduce the anti-corrosion cost, which can provide support for the production of marine anti-corrosion coatings.

[0040] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. An application of a preservative in inhibiting the growth of mold in marine anti-corrosion coatings, wherein the active ingredients of the preservative are compounded with geraniol and polyhexamethylene biguanide hydrochloride, wherein: The mass ratio of geraniol to polyhexamethylene biguanide hydrochloride is 1-5:19-1; the molds are Aspergillus niger, Aspergillus flavus, and Paecilomyces variotii.

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