A composition for an eco-friendly coating material and a method of preparing the same

Abstract

The present application relates to the technical field of paint, and disclose a kind of composition for environmental protection coating material and preparation method thereof, including 55-75 weight parts of mixed raw materials and 25-45 weight parts of functional masterbatch;The mixed raw material is composed of the following weight components: 40-45 weight parts of epoxy resin E51, 2-4 weight parts of biphenyl modified double triazole, 1-3 weight parts of epoxidized cardanol, 0.1-0.3 weight parts of defoaming agent BYK-024, 0.2-0.4 weight parts of levelling agent BIK BYK-333, 1-1.2 weight parts of 2,4,6-tri (dimethylaminomethyl) phenol, 6-8 weight parts of ethyl acetate;The functional masterbatch is composed of bixie powder and nano silver powder, and the weight ratio is 99:1.The composition for environmental protection coating material of the present application has good sterilization, water resistance, adhesion, impact resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a kind of composition for environment-friendly coating material and preparation method thereof. BACKGROUND

[0002] Traditional coating materials often face problems such as poor water resistance, poor adhesion to metal substrates, and lack of impact resistance during use. For example, in a wet environment, the coating is prone to blistering and peeling due to water absorption; when subjected to external impact, the coating is prone to cracking and even peeling, resulting in loss of protection for the substrate; at the same time, some traditional coating materials may also have poor environmental performance due to unreasonable composition design, which does not meet the demand for green and environmentally friendly materials in modern industry. With the development of industry, higher requirements are placed on the performance of coating materials, which not only need to have excellent physical and mechanical properties, but also need to have good water resistance and environmental performance. The patent application CN118791924A discloses an environmentally friendly acrylic paper cup barrier coating composition, preparation method and application. The invention has good high temperature resistance, but its water resistance has not been improved. Therefore, developing a coating material composition that has sterilization, water resistance, strong adhesion, and environmental protection has become an important research direction in the field of coating technology. SUMMARY

[0003] (I) Technical problems to be solved

[0004] In view of the deficiencies of the prior art, the present application provides a kind of composition for environment-friendly coating material and preparation method thereof, with good sterilization, water resistance, adhesion, impact resistance and induced anion effect.

[0005] (II) Technical solutions

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a kind of composition for environment-friendly coating material, characterized in that it comprises 55-75 parts by weight of mixed raw materials and 25-45 parts by weight of functional masterbatch;

[0007] The mixed raw materials consist of the following components by weight: 40-45 parts by weight of epoxy resin E51, 2-4 parts by weight of biphenyl-modified bistrizole, 1-3 parts by weight of epoxidized cardanol, 0.1-0.3 parts by weight of defoamer BYK-024, 0.2-0.4 parts by weight of leveling agent BYK-333, 1-1.2 parts by weight of 2,4,6-tris(dimethylaminomethyl)phenol, and 6-8 parts by weight of ethyl acetate.

[0008] The functional masterbatch is composed of bixbite powder and nano-silver powder, and the weight ratio is 99:1.

[0009] Further, the preparation method of the biphenyl-modified bistrizole is:

[0010] S1. Dehydroabietic acid, thioformyl dihydrazine are added to the reactor, stirred and mixed uniformly, heated to 165-170℃ for 40-48min, after the end of the reaction, cooled to room temperature, the product is ground into powder, washed with boiling water, 0.01mol / L sodium hydroxide solution in turn, filtered, dried, to obtain dehydroabietyl 1,2,4-triazole;

[0011] S2. 4,4'-Biphenyl dicarboxaldehyde, dehydroabietyl 1,2,4-triazole are added to the reactor, stirred and mixed, continue to add glacial acetic acid, stir to dissolve, Schiff base reaction, heated to 105-110℃ reflux reaction, after the end of the column chromatography purification, to obtain biphenyl modified bistriazole.

[0012] Further, the molar ratio of dehydroabietic acid, thioformyl dihydrazine in S1 is 17-20mmol:22-24mmol.

[0013] Further, the amount ratio of 4,4'-biphenyl dicarboxaldehyde, dehydroabietyl 1,2,4-triazole, glacial acetic acid in S2 is 5-6mmol:10-12mmol:45-55mL.

[0014] Further, the reflux reaction time in S2 is 5-7h.

[0015] Further, the preparation method of epoxidized cardanol is: a mixed solution of cardanol glycidyl ether, dichloromethane and ethanol is added to the reactor, stirred and mixed, continue to add meta-chloroperoxybenzoic acid, react at 26-30℃ for 1-1.5h, after the end of the reaction, water washing with saturated sodium sulfite solution, saturated sodium bicarbonate solution, saturated sodium chloride solution, after water washing to neutral, rotary evaporation with a rotary evaporator, to obtain epoxidized cardanol.

[0016] Further, the amount ratio of cardanol glycidyl ether, dichloromethane, ethanol, meta-chloroperoxybenzoic acid is 1mmol:28-35mL:7-8mL:1.3-1.4mmol.

[0017] Further, the functional masterbatch is composed of commercially available bixie powder and commercially available nano-silver powder, the weight ratio is 99:1, the above two powders are put into a three-dimensional mixer and stirred at slow speed for 10-30 minutes to obtain a functional masterbatch.

[0018] Further, the preparation method of the environmentally friendly coating material composition is as follows: epoxy resin E51, biphenyl modified binitrile, epoxidized cardanol, 2,4,6-tris(dimethylaminomethyl) phenol, defoaming agent BYK-024, leveling agent BYK-333 are added into ethyl acetate, stirred and mixed for 25-30 min to obtain a mixed raw material, and then the functional masterbatch is mixed with the mixed raw material by a mixer at a slow speed for 10-30 min to obtain the environmentally friendly coating material composition.

[0019] (Three) beneficial technical effects

[0020] The epoxy resin E51 is used as the main film-forming substance of the coating, and contains a large number of epoxy groups in the molecular chain and epoxy groups in the epoxidized cardanol, forming an epoxy system, which is cured under the action of 2,4,6-tris(dimethylaminomethyl) phenol, and the double mercapto groups (-HS) contained in the biphenyl modified binitrile can also promote the curing process, so that a dense network structure is formed between each other, the biphenyl group maintains the rigidity of the overall structure, avoids cracking of the coating caused by excessive deformation, and improves the hydrophobicity and impact resistance; and the biphenyl group in the biphenyl modified binitrile, the long-chain alkane in the cardanol, and the dehydrogenated longitudinal group structure itself also have good hydrophobic effect. The binitrile structure in the biphenyl modified binitrile can be used as a ligand to combine with metal ions through a coordination bond to form a stable complex, thereby improving the adhesion between the metal and the coating, and preventing the coating from peeling off. The long chain in the epoxidized cardanol can also enhance the bonding strength through physical adsorption, so that the coating is not easy to peel off. The functional masterbatch takes bixie powder as the basic material, superimposes nano silver powder material, and is scientifically proportioned to form a mixture. The mixture can continuously induce negative ions and release far infrared, can efficiently kill bacteria, deodorize and remove odors, improve air quality, and promote skin health. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the reaction formula of the biphenyl modified binitrile.

[0022] Figure 2 is the infrared spectrum of the biphenyl modified binitrile. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] For better understanding of the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings and specific embodiments of the specification.

[0025] 2,4,6-tris (dimethylaminomethyl) phenol, analytical pure, Shanghai Maikelin Biochemical Technology Co., Ltd.

[0026] Example 1

[0027] An environmental protection coating material composition, characterized in that it comprises 75 parts by weight of mixed raw materials and 25 parts by weight of functional masterbatch;

[0028] The mixed raw materials consist of the following components by weight: 40 parts by weight of epoxy resin E51, 2 parts by weight of biphenyl-modified bistriazole, 1 part by weight of epoxidized cardanol, 0.1 part by weight of defoamer BYK-024, 0.2 part by weight of leveling agent BYK-333, 1 part by weight of 2,4,6-tris (dimethylaminomethyl) phenol, 6 parts by weight of ethyl acetate;

[0029] The functional masterbatch consists of bixbite powder and nano-silver powder, and the weight ratio is 99:1.

[0030] The preparation method of the biphenyl-modified bistriazole is as follows:

[0031] S1. Add 17 mmol of dehydroabietic acid and 22 mmol of thioformyl dihydrazine into a reactor, stir and mix uniformly, heat to 165℃ and react for 40 min, then cool to room temperature, grind the product into powder, wash with boiling water and 0.01 mol / L sodium hydroxide solution in turn, filter and dry to obtain dehydroabietyl 1,2,4-triazole;

[0032] S2. Add 5 mmol of 4,4'-biphenyl dicarboxaldehyde and 10 mmol of dehydroabietyl 1,2,4-triazole into a reactor, stir and mix, continue to add 45 mL of glacial acetic acid, stir to dissolve, perform Schiff base reaction, heat to 105℃ and reflux for 5 h, then purify by column chromatography to obtain biphenyl-modified bistriazole. Figure 1 The characteristic absorption peak of -HS is 2550 cm -1 The absorption peak of C=N bond is 1625 cm -1 The absorption peak of C=N bond is 1625 cm -1 The absorption peak of benzene ring is 1580 cm

[0033] The preparation method of the epoxidized cardanol is that: a mixed solution of 1 mmol of cardanol glycidyl ether, 28 mL of dichloromethane and 7 mL of ethanol is added into a reactor, the mixture is stirred, 1.3 mmol of meta-chloroperoxybenzoic acid is continuously added, and the reaction is carried out at 26℃ for 1 h; after the reaction is completed, water washing is carried out with saturated sodium sulfite solution, saturated sodium bicarbonate solution and saturated sodium chloride solution in sequence until neutral; and then rotary evaporation is carried out to obtain the epoxidized cardanol.

[0034] The functional masterbatch is composed of commercially available bixbite powder and commercially available nano-silver powder, and the weight ratio is 99:1; the two kinds of powders are placed into a three-dimensional mixer according to the weight ratio, and slow stirring is carried out for 10 minutes to obtain the functional masterbatch.

[0035] The preparation method of the environmentally-friendly coating material composition is that: epoxy resin E51, biphenyl-modified binitriazole, epoxidized cardanol, 2,4,6-tris(dimethylaminomethyl)phenol, defoaming agent BYK-024 and leveling agent BYK-333 are added into ethyl acetate, and stirring and mixing are carried out for 25 min to obtain a mixed raw material; and then the functional masterbatch and the mixed raw material are mixed and stirred slowly for 10 min by a mixer to obtain the environmentally-friendly coating material composition.

[0036] Example 2

[0037] An environmentally-friendly coating material composition, characterized in that it comprises 55 parts by weight of a mixed raw material and 45 parts by weight of a functional masterbatch.

[0038] The mixed raw material is composed of the following components by weight: 45 parts by weight of epoxy resin E51, 4 parts by weight of biphenyl-modified binitriazole, 3 parts by weight of epoxidized cardanol, 0.3 parts by weight of defoaming agent BYK-024, 0.4 parts by weight of leveling agent BYK-333, 1.2 parts by weight of 2,4,6-tris(dimethylaminomethyl)phenol and 8 parts by weight of ethyl acetate.

[0039] The functional masterbatch is composed of bixbite powder and nano-silver powder, and the weight ratio is 99:1.

[0040] The preparation method of the biphenyl-modified binitriazole is as follows:

[0041] S1. 20 mmol of dehydroabietic acid and 24 mmol of thioformyl dihydrazine are added into a reactor, and stirring and mixing are carried out until uniform; the temperature is raised to 170℃, and the reaction is carried out for 48 min; after the reaction is completed, the temperature is cooled to room temperature; the product is ground into powder, and then washed with boiling water and 0.01 mol / L sodium hydroxide solution in sequence; and then filtration and drying are carried out to obtain dehydroabietyl 1,2,4-triazole.

[0042] S2. 6 mmol of 4,4'-biphenyldicarboxaldehyde and 12 mmol of dehydroabscisyl-1,2,4-triazole were added to the reactor and stirred. 55 mL of glacial acetic acid was added and stirred until dissolved. Schiff base reaction was carried out, and the mixture was heated to 110 °C and refluxed for 7 h. After the reaction was completed, the product was purified by column chromatography to obtain biphenyl-modified bis(triazole).

[0043] The method for preparing epoxidized cashew phenol is as follows: a mixed solution of 1 mmol cashew phenol glycidyl ether, 35 mL dichloromethane and 8 mL ethanol is added to a reactor and stirred. Then, 1.4 mmol m-chloroperoxybenzoic acid is added and the mixture is reacted at 30 °C for 1.5 h. After the reaction is completed, the mixture is washed with water in sequence with saturated sodium sulfite solution, saturated sodium bicarbonate solution and saturated sodium chloride solution. After washing with water until neutral, the mixture is evaporated by rotary evaporation to obtain epoxidized cashew phenol.

[0044] The functional masterbatch is composed of commercially available tourmaline powder and commercially available nano silver powder in a weight ratio of 99:1. The two powders are mixed in the specified weight ratio in a three-dimensional mixer and stirred slowly for 30 minutes to obtain the functional masterbatch.

[0045] The preparation method of the environmentally friendly coating material composition is as follows: epoxy resin E51, biphenyl-modified bis(triazole), epoxidized cashew phenol, 2,4,6-tris(dimethylaminomethyl)phenol, defoamer BYK-024, and leveling agent BYK-333 are added to ethyl acetate and stirred for 30 minutes to obtain a mixed raw material. Then, the functional masterbatch and the mixed raw material are mixed and stirred slowly for 30 minutes in a mixer to obtain the environmentally friendly coating material composition.

[0046] Example 3

[0047] An environmentally friendly coating material composition, characterized in that it comprises 70 parts by weight of mixed raw materials and 30 parts by weight of functional masterbatch;

[0048] The mixed raw materials consist of the following components by weight: 42 parts by weight of epoxy resin E51, 3 parts by weight of biphenyl-modified bis(triazole), 2 parts by weight of epoxidized cashew nut shell powder, 0.2 parts by weight of defoamer BYK-024, 0.3 parts by weight of leveling agent BYK-333, 1.1 parts by weight of 2,4,6-tris(dimethylaminomethyl)phenol, and 7 parts by weight of ethyl acetate;

[0049] The functional masterbatch is composed of tourmaline powder and nano silver powder in a weight ratio of 99:1.

[0050] The preparation method of the biphenyl-modified bistriazole is as follows:

[0051] S1. 18 mmol of dehydroabietic acid, 23 mmol of thioformohydrazide were added into a reactor, stirred and mixed uniformly, heated to 167℃ for 45 min, after the reaction was completed, it was cooled to room temperature, the product was ground into powder, washed with boiling water, 0.01 mol / L sodium hydroxide solution in turn, filtered and dried, to obtain dehydroabietyl 1,2,4-triazole;

[0052] S2. 5.5 mmol of 4,4'-biphenyl dicarboxaldehyde, 11 mmol of dehydroabietyl 1,2,4-triazole were added into a reactor, stirred and mixed, 50 mL of glacial acetic acid was continuously added, stirred until dissolved, Schiff base reaction was carried out, heated to 107℃ for reflux reaction for 6 h, after the reaction was completed, column chromatography was used for purification, to obtain biphenyl modified bis-triazole.

[0053] The preparation method of the epoxidized cardanol is: a mixed solution of 1 mmol of cardanol glycidyl ether, 32 mL of dichloromethane and 7.5 mL of ethanol was added into a reactor, stirred and mixed, 1.35 mmol of meta-chloroperbenzoic acid was continuously added, reacted at 28℃ for 1.2 h, after the reaction was completed, it was washed with saturated sodium sulfite solution, saturated sodium bicarbonate solution and saturated sodium chloride solution in turn, after water washing to neutral, rotary evaporation was carried out to obtain epoxidized cardanol.

[0054] The functional masterbatch is composed of commercially available bixbite powder and commercially available nano-silver powder, and the weight ratio is 99:1, the two powders are placed in a three-dimensional mixer according to the weight ratio, stirred at a slow speed for 15 minutes to obtain the functional masterbatch.

[0055] The preparation method of the environmentally friendly coating material composition is: epoxy resin E51, biphenyl modified bis-triazole, epoxidized cardanol, 2,4,6-tris (dimethylaminomethyl) phenol, defoaming agent BYK-024, leveling agent BYK-333 were added into ethyl acetate, stirred and mixed for 27 min to obtain a mixed raw material, then the functional masterbatch was mixed with the mixed raw material by a mixer at a slow speed for 20 min to obtain the environmentally friendly coating material composition.

[0056] Comparative Example 1

[0057] An environmentally friendly coating material composition, characterized in that it comprises 70 parts by weight of a mixed raw material and 30 parts by weight of a functional masterbatch.

[0058] The mixed raw material is composed of the following components by weight: 42 parts by weight of epoxy resin E51, 3 parts by weight of dehydroabietic acid, 2 parts by weight of epoxidized cardanol (the same as in Preparation Method and Example 3), 0.2 parts by weight of defoaming agent BYK-024, 0.3 parts by weight of leveling agent BYK-333, 1.1 parts by weight of 2,4,6-tris (dimethylaminomethyl) phenol, 7 parts by weight of ethyl acetate.

[0059] The functional masterbatch is composed of bixbite powder and nano-silver powder, and the weight ratio is 99:1.

[0060] The epoxy resin E51, dehydroabietic acid, epoxidized cardanol, 2,4,6-tris(dimethylaminomethyl)phenol, defoaming agent BYK-024, and leveling agent BYK-333 are added into ethyl acetate, stirred and mixed for 27 min to obtain a mixed raw material, and then the functional masterbatch is mixed with the mixed raw material by a mixer at a slow stirring speed for 20 min to obtain the composition for the environmentally friendly coating material.

[0061] The difference between the comparative example and example 3 is that dehydroabietic acid is used instead of biphenyl-modified bistrizole.

[0062] Comparative example 2

[0063] A composition for an environmentally friendly coating material, characterized in that it comprises 70 parts by weight of a mixed raw material and 30 parts by weight of a functional masterbatch.

[0064] The mixed raw material is composed of the following components by weight: 42 parts by weight of epoxy resin E51, 3 parts by weight of biphenyl-modified bistrizole (the same preparation method and example 3), 0.2 parts by weight of defoaming agent BYK-024, 0.3 parts by weight of leveling agent BYK-333, 1.1 parts by weight of 2,4,6-tris(dimethylaminomethyl)phenol, and 7 parts by weight of ethyl acetate.

[0065] The functional masterbatch is composed of bixbite powder and nano-silver powder, and the weight ratio is 99:1.

[0066] The epoxy resin E51, dehydroabietic acid, epoxidized cardanol, 2,4,6-tris(dimethylaminomethyl)phenol, defoaming agent BYK-024, and leveling agent BYK-333 are added into ethyl acetate, stirred and mixed for 27 min to obtain a mixed raw material, and then the functional masterbatch is mixed with the mixed raw material by a mixer at a slow stirring speed for 20 min to obtain the composition for the environmentally friendly coating material.

[0067] The difference between the comparative example and example 3 is that no epoxidized cardanol is added.

[0068] The static water contact angle test is performed according to GB / T 23764-2009; the impact resistance is tested according to GB / T 1732-2020, the test method is that the maximum height that the material surface can withstand without damage, crack, peeling, etc. when a steel ball with a mass of 1000g is freely dropped from a certain height, unit: cm; the adhesion grade of the coating to the metal is tested according to GB / T9286-2021 standard. The antibacterial test is performed according to GB / T21866-2008 Antibacterial Coatings (Paint Film) Antibacterial Property Determination Method and Antibacterial Effect.

[0069] Table 1: Performance test of the composition for environmentally friendly coating material

[0070]

[0071] From Table 1, it can be seen that the composition for environmentally friendly coating material prepared by the present application has good impact resistance, water resistance and adhesion. In Comparative Example 1, dehydroabietyl acid is used instead of biphenyl modified bistrizole, which lacks sulfydryl, trizole group and biphenyl structure, resulting in a decrease in performance. In Comparative Example 2, no epoxidized cardanol is added, resulting in a decrease in performance.

[0072] The present application has been described above in detail with specific reference to exemplary embodiments. It is understood, however, that variations and modifications can be effected within the scope of the application as defined in the attached claims. The detailed description is to be considered merely as illustrative of the described technology and is not to be taken in a limiting sense. If there is any conflict between what is described in the detailed description and what is depicted in the figures or examples, the detailed description is deemed to be controlling. Moreover, the background section is to be understood as a discussion of the technological background of the present technology and is not to be taken as an admission that the present application is not entitled to antedate such discussion or that the present application or the application does not relate to the technological field of the background art.

[0073] More specifically, although illustrative embodiments of the application have been described herein, the present application is not limited to these embodiments, but includes any and all embodiments having modifications, omissions, combinations (e.g., of aspects across various embodiments), adaptations and / or alterations as would be appreciated by those skilled in the art, in light of the foregoing detailed description. The limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the foregoing detailed description or during the course of the application. Any steps listed in any method or process claim are to be considered in the same scope as if the steps were repeated in any combination. Accordingly, the scope of the application should be determined by the following claims and their legal equivalents rather than by the foregoing description and examples. The foregoing detailed description has set forth various embodiments of the application via the use of specific exemplary embodiments. However, these embodiments are offered by way of example only and are not intended to be exhaustive or limiting in any way. Thus, it should be apparent that there are many variations that can be made in form, detail, and / or implementation of each embodiment of the application without departing from the spirit and intent of the application. The application as described herein is intended to be broadly applicable to all embodiments falling within the scope of the appended claims and their legal equivalents.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. If there is a contradiction between what is in the specification and what is in the definitions, the definition shall control. Where the term "comprising" is used in the specification and claims, it is intended to mean that the processes or compositions include not only the recited steps or components, but also other steps or components that are not recited. Where the term "comprising" is used in the specification and claims, it is intended to mean that the processes or compositions include not only the recited steps or components, but also other steps or components that are not recited. Unless otherwise specified, the flow rate, power, refractive index, time, or other value or parameter herein is intended to represent a range of values that is specifically disclosed, and that is not intended to be limited to a single value or a range of values. For example, a range of 1-50 should be interpreted to include any number, combination of numbers, or sub-range between the upper and lower limits of the range, e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, as well as all decimal values between the integers, e.g., 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and 1.9. With respect to sub-ranges, "nested sub-ranges" extending from either end of the range are specifically contemplated. For example, exemplary nested sub-ranges of the range 1-50 can include 1-10, 1-20, 1-30, and 1-40 in one direction, or 50-40, 50-30, 50-20, and 50-10 in the other direction.

Claims

1. A composition for an environmentally friendly coating material, characterized by comprising: The functional masterbatch comprises 55-75 parts by weight of mixed raw materials and 25-45 parts by weight of functional masterbatch; The mixed raw materials are composed of 40-45 parts by weight of epoxy resin E51, 2-4 parts by weight of biphenyl-modified bistrizole, 1-3 parts by weight of epoxidized cardanol, 0.1-0.3 parts by weight of defoaming agent BYK-024, 0.2-0.4 parts by weight of leveling agent BYK-333, 1-1.2 parts by weight of 2,4,6-tris(dimethylaminomethyl)phenol, and 6-8 parts by weight of ethyl acetate. The functional masterbatch is composed of bixite powder and nano-silver powder, and the weight ratio is 99:

1. The preparation method of the biphenyl-modified bistrizole is as follows: S1. Dehydroabietic acid and thioformohydrazide are added into a reactor, stirred and uniformly mixed, heated to 165-170 DEG C and reacted for 40-48 min, then cooled to room temperature, and the product is ground into powder, washed with boiling water and 0.01 mol / L sodium hydroxide solution in sequence, filtered and dried to obtain dehydroabietyl 1,2,4-triazole; S2. 4,4'-Biphenyldicarboxaldehyde and dehydroabietyl 1,2,4-triazole are added into a reactor, stirred and mixed, and glacial acetic acid is continuously added, stirred to dissolve, and subjected to Schiff base reaction, heated to 105-110 DEG C and refluxed for reaction, then purified by column chromatography to obtain biphenyl-modified bistrizole; The preparation method of the epoxidized cardanol is as follows: a mixed solution of cardanol glycidyl ether, dichloromethane and ethanol is added into a reactor, stirred and mixed, and meta-chloroperoxybenzoic acid is continuously added, reacted at 26-30 DEG C for 1-1.5 h, then washed with saturated sodium sulfite solution, saturated sodium bicarbonate solution and saturated sodium chloride solution in sequence, washed to neutral, and rotary evaporated to obtain epoxidized cardanol.

2. The composition for an eco-friendly coating material according to claim 1, wherein The molar ratio of dehydroabietic acid to thioformohydrazide in S1 is 17-20 mmol:22-24 mmol.

3. The composition for an eco-friendly coating material according to claim 1, wherein The ratio of the amounts of 4,4'-biphenyldicarboxaldehyde, dehydroabietyl 1,2,4-triazole and glacial acetic acid in S2 is 5-6 mmol:10-12 mmol:45-55 mL.

4. The composition for an eco-friendly coating material according to claim 1, wherein The reflux reaction time in S2 is 5-7 h.

5. The composition for an eco-friendly coating material according to claim 1, wherein The ratio of the amounts of cardanol glycidyl ether, dichloromethane, ethanol and meta-chloroperoxybenzoic acid is 1 mmol:28-35 mL:7-8 mL:1.3-1.4 mmol.

6. The composition for an eco-friendly coating material according to claim 1, wherein The functional masterbatch is composed of commercially available bixite powder and commercially available nano-silver powder, and the weight ratio is 99:

1. The two powders are placed into a three-dimensional mixer and stirred at a low speed for 10-30 min to obtain the functional masterbatch.

7. A process for the preparation of a composition for an environmentally friendly coating material as claimed in any one of claims 1 to 6, characterized in that The preparation method of the environment-friendly coating material composition is as follows: epoxy resin E51, biphenyl modified b-triazole, epoxidized cardanol, 2,4,6-tris (dimethylaminomethyl) phenol, defoaming agent BYK-024, leveling agent BYK-333 are added into ethyl acetate, and stirring and mixing are carried out for 25-30 min to obtain a mixed raw material, then the functional master batch is mixed with the mixed raw material through a mixing machine and slow stirring is carried out for 10-30 min to obtain the environment-friendly coating material composition.

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