Preservative as well as preparation method and application thereof

Abstract

The invention provides a preservative as well as a preparation method and application thereof, and belongs to the technical field of preservatives. The 8-hydroxyquinoline in the preservative provided by the invention has strong coordination and chelation capabilities, and is adsorbed on the surface of a matrix through physical and chemical actions to form a protective film, so that permeation of a corrosion medium is blocked; acetylsalicylic acid can form a layer of protective film in the coating, so that the corrosion process is inhibited; carboxyglyceride can improve the flexibility and durability of the coating, and also has a certain antibacterial property, so that the corrosion resistance of the coating is enhanced; bronopol is used as a broad-spectrum preservative, can kill microorganisms by releasing active oxygen in the coating, and also can improve the antibacterial and anticorrosive properties of the coating through the synergistic effect with other preservatives; the alcohol solvent is an excellent solvent and stabilizer, and when the alcohol solvent is combined with other preservative components for use, the preservative with excellent corrosion resistance can be formed.

Description

Technical Field

[0001] The invention belongs to the technical field of preservatives, and specifically relates to a preservative and a preparation method and application thereof. Background Art

[0002] When polyurethane resin is used as a surface coating for steel structures, wood and other substrates, the coating film formed has good mechanical properties, good wear resistance, high hardness, water resistance, chemical resistance, and excellent aging resistance, and is a high-performance coating. In order to improve the bactericidal properties of the coating, it is generally necessary to add a preservative. However, the existing preservative mainly uses acetylsalicylic acid, which has a relatively general bactericidal effect and stability, and has no benefit on the adhesion of the coating.

[0003] Therefore, there is an urgent need for a preservative that has good bactericidal effect and stability and can improve the adhesion performance of the coating. Summary of the invention

[0004] The object of the present invention is to provide a preservative and a preparation method and application thereof. The preservative provided by the present invention has good bactericidal effect and stability and can improve the adhesion performance of the coating.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The invention provides a preservative, which comprises the following components by mass percentage: 20-30% of 8-hydroxyquinoline, 10-15% of acetylsalicylic acid, 15-25% of carboxylic acid glyceride, 5-10% of Bropol and the remainder of an alcohol solvent.

[0007] Preferably, the following components are included by mass percentage: 20-28% of 8-hydroxyquinoline, 10-15% of acetylsalicylic acid, 15-25% of carboxylic acid glyceride, 5-10% of Bropol and the balance of alcohol solvent.

[0008] Preferably, the alcohol solvent includes at least one of methanol, ethylene glycol, propylene glycol and polyethylene glycol.

[0009] Preferably, the alcohol solvent is polyethylene glycol.

[0010] The present invention also provides a method for preparing the preservative described in the above technical solution, comprising the following steps:

[0011] (1) mixing 8-hydroxyquinoline, acetylsalicylic acid and an alcohol solvent to obtain a mixed solution;

[0012] (2) The mixed solution obtained in step (1) is mixed with carboxylic acid glyceride and Bropol to obtain a preservative.

[0013] Preferably, the mixing in step (1) is stirring.

[0014] Preferably, the stirring rate is 1000-1200 rpm.

[0015] Preferably, the mixing in step (2) is stirring.

[0016] Preferably, the stirring rate is 1300-1500 rpm.

[0017] The present invention also provides the use of the preservative described in the above technical solution or the preservative prepared according to the preparation method described in the above technical solution in coatings.

[0018] The invention provides a preservative, which comprises the following components by mass percentage: 20-30% of 8-hydroxyquinoline, 10-15% of acetylsalicylic acid, 15-25% of carboxylic acid glyceride, 5-10% of Bropol and the remainder of an alcohol solvent. The 8-hydroxyquinoline in the preservative provided by the invention has strong coordination and chelating ability, and forms a protective film on the surface of a substrate through physical and chemical adsorption to block the penetration of corrosive media; acetylsalicylic acid may form a protective film in the coating through the action on the surface of the substrate, thereby inhibiting the corrosion process; carboxylic acid glyceride may be used as a plasticizer, stabilizer or emulsifier to improve the flexibility and durability of the coating, and also has certain antibacterial properties, and can inhibit the growth of microorganisms to a certain extent, thereby enhancing the anticorrosive performance of the coating; Bropol, as a broad-spectrum preservative, can kill microorganisms in the coating by releasing active oxygen, and may also improve the antibacterial and anticorrosive performance of the coating through synergistic action with other preservatives; the alcohol solvent itself is an excellent solvent and stabilizer, and can be used as a thickener, dispersant or lubricant in the coating, and when the alcohol solvent is used in combination with other preservative components, a preservative with excellent anticorrosive performance can be formed. The results of the examples show that after the preservative provided by the present invention is added to the polyurethane coating, the sterilization rate of Staphylococcus aureus reaches 100%, and no flocculation, precipitation or demulsification occurs. The preservative has excellent stability and can improve the adhesion performance of the polyurethane coating. DETAILED DESCRIPTION

[0019] The invention provides a preservative, which comprises the following components by mass percentage: 20-30% of 8-hydroxyquinoline, 10-15% of acetylsalicylic acid, 15-25% of carboxylic acid glyceride, 5-10% of Bropol and the remainder of an alcohol solvent.

[0020] Unless otherwise specified, the present invention has no particular limitation on the sources of the components, and commercially available products known to those skilled in the art may be used.

[0021] By mass percentage, the preservative provided by the present invention includes 20-30% of 8-hydroxyquinoline. In an embodiment of the present invention, the amount of the 8-hydroxyquinoline can be specifically 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29% or 30%. In the present invention, the 8-hydroxyquinoline has a strong coordination and chelating ability, and forms a protective film on the surface of the substrate through physical and chemical adsorption to block the penetration of corrosive media. The present invention controls the amount of 8-hydroxyquinoline within the above range, which can further improve the anti-corrosion performance of the preservative.

[0022] In terms of mass percentage, the preservative provided by the present invention includes 10-15% of acetylsalicylic acid. In an embodiment of the present invention, the amount of the acetylsalicylic acid may be specifically 10%, 11%, 12%, 13%, 14% or 15%. In the present invention, the acetylsalicylic acid may form a protective film in the coating by acting on the surface of the substrate, thereby inhibiting the corrosion process. The present invention controls the amount of acetylsalicylic acid within the above range, which can further improve the anti-corrosion performance of the preservative.

[0023] By mass percentage, the preservative provided by the present invention includes 15-25% of carboxylic acid glyceride. In an embodiment of the present invention, the amount of the carboxylic acid glyceride can be specifically 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24% or 25%. In the present invention, the carboxylic acid glyceride can be used as a plasticizer, stabilizer or emulsifier to improve the flexibility and durability of the coating, and also has certain antibacterial properties, which can inhibit the growth of microorganisms to a certain extent, thereby enhancing the anticorrosive properties of the coating. The present invention controls the amount of carboxylic acid glyceride within the above range, which can further improve the anticorrosive properties of the preservative.

[0024] By mass percentage, the preservative provided by the present invention includes 5-10% of Brobol. In an embodiment of the present invention, the amount of Brobol can be specifically 5%, 6%, 7%, 8%, 9% or 10%. In the present invention, Brobol, as a broad-spectrum preservative, can kill microorganisms in the coating by releasing active oxygen, and can also improve the antibacterial and anticorrosive properties of the coating through synergistic effects with other preservatives. The present invention controls the amount of Brobol within the above range, which can further improve the anticorrosive properties of the preservative.

[0025] The preservative provided by the present invention includes the remainder of an alcohol solvent by mass percentage. In the present invention, the alcohol solvent itself is an excellent solvent and stabilizer, and can be used as a thickener, dispersant or lubricant in the coating. When the alcohol solvent is used in combination with other preservative ingredients, a preservative with excellent antiseptic performance can be formed.

[0026] In the present invention, the alcohol solvent preferably includes at least one of methanol, ethylene glycol, propylene glycol and polyethylene glycol, and more preferably polyethylene glycol.

[0027] The present invention controls the type and amount of the alcohol solvent within the above range, which can further improve the anti-corrosion properties of the coating.

[0028] The present invention controls the composition of the preservative and the dosage of each component, and the components have a synergistic effect to enhance the anti-corrosion effect of the coating. 8-Hydroxyquinoline, carboxylic acid glyceride and alcohol solvent can effectively improve the internal cross-linking structure of the coating, enhance its water resistance and acid and alkali resistance, improve the adhesion performance and corrosion resistance of the coating, and increase the service life of the coating.

[0029] The present invention also provides a method for preparing the preservative described in the above technical solution, comprising the following steps:

[0030] (1) mixing 8-hydroxyquinoline, acetylsalicylic acid and an alcohol solvent to obtain a mixed solution;

[0031] (2) The mixed solution obtained in step (1) is mixed with carboxylic acid glyceride and Bropol to obtain a preservative.

[0032] The invention mixes 8-hydroxyquinoline, acetylsalicylic acid and an alcohol solvent to obtain a mixed solution.

[0033] In the present invention, the mixing is preferably stirring; the stirring rate is preferably 1000-1200 rpm; the stirring temperature is preferably 20-30° C. The present invention has no particular limitation on the stirring time, as long as the components are mixed evenly.

[0034] After the mixed solution is obtained, the present invention mixes the mixed solution with carboxylic acid glyceride and Bropol to obtain a preservative.

[0035] In the present invention, the mixing is preferably stirring; the stirring rate is preferably 1300-1500 rpm; the stirring temperature is preferably 20-30° C. The present invention has no particular limitation on the stirring time, as long as the components are mixed uniformly.

[0036] The present invention adopts the method of first slow stirring and then fast stirring to ensure uniform mixing and dispersion of various components in the preservative; slow stirring helps to preliminarily mix the coating without destroying certain fragile components in the preservative or components that need to be gently handled, and the subsequent fast stirring can more strongly shear and disperse the solid particles in the preservative, so that they are fully dispersed in the solvent, thereby improving the uniformity and stability of the preservative; slow stirring is used in the initial mixing stage to avoid bubbles and particle breakage that may be generated under high-speed stirring, while fast stirring further ensures the uniformity of the preservative on the basis of slow stirring, improves the dispersion efficiency for easy construction and use; this stirring method helps to reduce physical damage during the stirring process, while ensuring the final performance of the preservative.

[0037] The present invention also provides the use of the preservative described in the above technical solution or the preservative prepared according to the preparation method described in the above technical solution in coatings.

[0038] The present invention has no special limitation on the operation of the application, and the technical solutions of the application well known to those skilled in the art may be adopted.

[0039] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example 1

[0041] A preservative, which consists of the following components by mass percentage: 25% of 8-hydroxyquinoline, 12% of acetylsalicylic acid, 20% of carboxylic acid glyceride, 8% of Bropol and the balance of polyethylene glycol;

[0042] The preparation method of the preservative is as follows: (1) 8-hydroxyquinoline, acetylsalicylic acid and polyethylene glycol are mixed, and stirred at a rate of 1100 rpm at room temperature to obtain a mixed solution;

[0043] (2) The mixed solution obtained in step (1) is mixed with carboxylic acid glyceride and Bropol, and stirred at room temperature at a rate of 1300 rpm to obtain a preservative.

[0044] Example 2

[0045] A preservative, which consists of the following components by mass percentage: 20% of 8-hydroxyquinoline, 10% of acetylsalicylic acid, 15% of carboxylic acid glyceride, 5% of Bropol and the balance of ethylene glycol;

[0046] The preparation method of the preservative is as follows: (1) 8-hydroxyquinoline, acetylsalicylic acid and ethylene glycol are mixed, and stirred at a rate of 1000 rpm at room temperature to obtain a mixed solution;

[0047] (2) The mixed solution obtained in step (1) is mixed with carboxylic acid glyceride and Bropol, and stirred at room temperature at a rate of 1300 rpm to obtain a preservative.

[0048] Example 3

[0049] A preservative, which consists of the following components by mass percentage: 30% of 8-hydroxyquinoline, 15% of acetylsalicylic acid, 15% of carboxylic acid glyceride, 5% of Bropol and the balance of methanol;

[0050] The preparation method of the preservative is as follows: (1) 8-hydroxyquinoline, acetylsalicylic acid and methanol are mixed, and stirred at a rate of 1200 rpm at room temperature to obtain a mixed solution;

[0051] (2) The mixed solution obtained in step (1) is mixed with carboxylic acid glyceride and Bropol, and stirred at room temperature at a rate of 1500 rpm to obtain a preservative.

[0052] Example 4

[0053] A preservative, which consists of the following components by mass percentage: 22% of 8-hydroxyquinoline, 12% of acetylsalicylic acid, 25% of carboxylic acid glyceride, 10% of Bropol and the balance of propylene glycol;

[0054] The preparation method of the preservative is as follows: (1) 8-hydroxyquinoline, acetylsalicylic acid and propylene glycol are mixed, and stirred at a rate of 1100 rpm at room temperature to obtain a mixed solution;

[0055] (2) The mixed solution obtained in step (1) is mixed with carboxylic acid glyceride and Bropol, and stirred at room temperature at a rate of 1300 rpm to obtain a preservative.

[0056] Example 5

[0057] A preservative, which consists of the following components by mass percentage: 28% of 8-hydroxyquinoline, 15% of acetylsalicylic acid, 20% of carboxylic acid glyceride, 6% of Bropol and the balance of polyethylene glycol;

[0058] The preparation method of the preservative is as follows: (1) 8-hydroxyquinoline, acetylsalicylic acid and polyethylene glycol are mixed, and stirred at a rate of 1200 rpm at room temperature to obtain a mixed solution;

[0059] (2) The mixed solution obtained in step (1) is mixed with carboxylic acid glyceride and Bropol, and stirred at room temperature at a rate of 1500 rpm to obtain a preservative.

[0060] Comparative Example 1

[0061] 8-Hydroxyquinoline in Example 1 was omitted, and other parameters and preparation methods were the same as those in Example 1.

[0062] Comparative Example 2

[0063] The carboxylic acid glyceride in Example 1 was omitted, and other parameters and preparation methods were the same as those in Example 1.

[0064] Application Example 1

[0065] The water-based polyurethane 951 waterproof coating (without bactericidal preservative) produced by Shouguang Lufeng Waterproof Material Co., Ltd. was selected as the blank coating, and 1000ppm and 2000ppm of the preservatives in Examples 1 to 5 and Comparative Examples 1 to 2 were added respectively. The bactericidal rate against Staphylococcus aureus was tested according to the GB15979-2002 method. The results are shown in Table 1.

[0066] Table 1 Bactericidal effect of preservatives in Examples 1 to 5 and Comparative Examples 1 to 2

[0067]

[0068] It can be seen from Table 1 that the preservative provided by the present invention has an excellent bactericidal effect when used in polyurethane coatings.

[0069] Application Example 2

[0070] The water-based polyurethane 951 waterproof coating (not containing bactericidal preservatives) of Shouguang Lufeng Waterproof Material Co., Ltd. was selected as a blank coating, and 0.3% of the mass of the blank coating was added to Examples 1 to 5, Comparative Examples 1 to 2, and commercially available preservatives LD05, M530, Huake 981 and KF-92, to observe whether flocculation, demulsification or precipitation occurred, and to detect the compatibility of the preservatives with the coating. The results are shown in Table 2.

[0071] Table 2 Compatibility results of Examples 1-5, Comparative Examples 1-2, commercially available preservatives LD05, M530, Huake 981 and KF-92 with polyurethane coatings

[0072] preservative Whether flocculation / precipitation occurs Whether the emulsion is broken / stratified Example 1 no no Example 2 no no Example 3 no no Example 4 no no Example 5 no no Comparative Example 1 Flocculation Demulsification Comparative Example 2 no no LD05 Flocculation Demulsification M530 Flocculation Demulsification Huake 981 Flocculation no KF-92 Flocculation Demulsification

[0073] It can be seen from Table 2 that the preservatives of Examples 1 to 5 of the present invention have good compatibility with the polyurethane coating. After being added to the coating, no flocculation or precipitation occurs, no demulsification or stratification occurs, and the leveling property is good, and the original leveling property can be maintained. After the preservatives LD05, M530, Huake 981, and KF-92 are added to the coating, different degrees of flocculation, demulsification, and precipitation occur.

[0074] Application Example 3

[0075] The preservatives in Examples 1 to 5 were sealed and stored at room temperature (25±2° C.) for 6 months to observe whether they had stratification or turbidity; and were placed in an oven at 40° C. for 2 months to observe whether they had stratification or turbidity.

[0076] The results show that the preservatives in each embodiment have no stratification or turbidity, which shows that the preservatives provided by the present invention have good stability.

[0077] Application Example 4

[0078] The water-based polyurethane 951 waterproof coating (containing no bactericidal preservative) of Shouguang Lufeng Waterproof Material Co., Ltd. was selected as a blank coating, and 0.3% of the preservatives in Examples 1 to 5 and Comparative Examples 1 to 2 by mass of the blank coating were added respectively, and coated on the surface of a metal substrate (316 stainless steel). Performance tests were performed (referring to GB / T9286-1998 "Scratching test for paint and varnish films", GB / T 1766-2008 "Evaluation of aging of paint and varnish coatings by neutral salt spray test"), and the results are shown in Table 3.

[0079] Table 3 Properties of the paint films after adding the preservatives of Examples 1 to 5 and Comparative Examples 1 to 2 to the polyurethane coatings

[0080]

[0081] It can be seen from the data in Table 3 that after the preservative of the present invention is added to the polyurethane coating, the coating surface is flat and smooth, with good water resistance, good corrosion resistance and strong adhesion.

[0082] In summary, the preservative provided by the present invention has excellent bactericidal performance and good stability. After being added to the polyurethane coating, it has good compatibility with the polyurethane coating and can improve the adhesion performance of the coating.

[0083] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A preservative, comprising the following components by mass percentage: 20-30% of 8-hydroxyquinoline, 10-15% of acetylsalicylic acid, 15-25% of carboxylic acid glyceride, 5-10% of Bropol and the remainder of an alcohol solvent.

2. The preservative according to claim 1, characterized in that The invention comprises the following components by mass percentage: 20-28% of 8-hydroxyquinoline, 10-15% of acetylsalicylic acid, 15-25% of carboxylic acid glyceride, 5-10% of Bropol and the balance of alcohol solvent.

3. The preservative according to claim 1, characterized in that The alcohol solvent includes at least one of methanol, ethylene glycol, propylene glycol and polyethylene glycol.

4. The preservative according to claim 3, characterized in that The alcohol solvent is polyethylene glycol.

5. The method for preparing the preservative according to any one of claims 1 to 4, comprising the following steps: (1) mixing 8-hydroxyquinoline, acetylsalicylic acid and an alcohol solvent to obtain a mixed solution; (2) The mixed solution obtained in step (1) is mixed with carboxylic acid glyceride and Bropol to obtain a preservative.

6. The preparation method according to claim 5, characterized in that: The mixing in step (1) is stirring.

7. The preparation method according to claim 6, characterized in that: The stirring speed is 1000-1200 rpm.

8. The preparation method according to claim 5, characterized in that: The mixing in step (2) is stirring.

9. The preparation method according to claim 8, characterized in that: The stirring speed is 1300-1500 rpm.

10. Use of the preservative according to any one of claims 1 to 4 or the preservative prepared by the preparation method according to any one of claims 5 to 9 in coatings.

Images