阅读说明：本技术 一种耐海水耐油有弹性环氧压载舱涂料及制备方法 (Seawater-resistant oil-resistant elastic epoxy ballast tank coating and preparation method thereof ) 是由 陆腾飞 张刚 阳区 李著初 徐常利 于 2021-06-24 设计创作，主要内容包括：本发明提供的一种耐海水耐油有弹性环氧压载舱涂料,它是在以双酚A树脂结构为主的环氧涂料中引入二聚酸环氧树脂,并利用固化剂的协同固化作用来获得综合性能优异的环氧压载舱涂料。该涂料包括A组分和B组分；其中A组分按由质量百分比的如下组分组成：二聚酸改性环氧树脂10.5～15％；环氧树脂15～24％；自制铝银浆5～15％；长石粉30～50％；滑石粉5～10％；消泡剂0.1～1.0％；防流挂剂0.5～1.5％；防沉剂0.3～1.5％；二甲苯溶剂5～12％；苯甲醇0.5～1.5％。B组分由以下质量分数的原料组成：固化剂90～95％；二甲苯溶剂5～10％。A组分和B组分在使用时按照质量比A:B＝(8-10)：1的比例配比。(The invention provides a seawater-resistant oil-resistant elastic epoxy ballast tank coating, which is obtained by introducing dimer acid epoxy resin into an epoxy coating mainly with a bisphenol A resin structure and utilizing the synergistic curing effect of a curing agent to obtain the epoxy ballast tank coating with excellent comprehensive performance. The coating comprises a component A and a component B; wherein the component A comprises the following components in percentage by mass: 10.5-15% of dimer acid modified epoxy resin; 15-24% of epoxy resin; 5-15% of self-made aluminum paste; 30-50% of feldspar powder; 5-10% of talcum powder; 0.1-1.0% of defoaming agent; 0.5-1.5% of anti-sagging agent; 0.3-1.5% of anti-settling agent; 5-12% of a xylene solvent; 0.5-1.5% of benzyl alcohol. The component B comprises the following raw materials in parts by mass: 90-95% of a curing agent; 5-10% of a xylene solvent. When the component A and the component B are used, the mass ratio of A to B is (8-10):1 in proportion.)

1. The seawater-resistant oil-resistant elastic epoxy ballast tank coating is characterized by consisting of a component A and a component B; the component A comprises the following raw materials in parts by mass:

the component B comprises the following raw materials in parts by mass:

90 to 95 percent of curing agent

5-10% of a xylene solvent;

when the component A and the component B are used, the mass ratio of A to B is (8-10):1 in proportion.

The curing agent of the component B is one of polyamide curing agent, polyamide adduct, amidoamine and modified amine.

2. The seawater-resistant oil-resistant elastic epoxy ballast tank coating material of claim 1, wherein: the dimer acid modified epoxy resin has a viscosity of 900-1500 mPa.s (25 ℃), and an epoxy equivalent of 280-600.

3. The seawater-resistant oil-resistant elastic epoxy ballast tank coating material as claimed in claim 1, wherein the epoxy resin is selected from resins with an epoxy equivalent of 100-500.

4. The seawater-resistant oil-resistant elastic epoxy ballast tank coating material as claimed in claim 1, which is characterized in that the self-made aluminum silver paste comprises the following components:

40-75% of aluminum paste

15-30% of n-butyl alcohol

10-20% of benzyl alcohol.

5. The seawater-resistant, oil-resistant and elastic epoxy ballast tank coating material of claim 1, wherein the defoaming agent is one of higher alcohols, fatty acids and salts thereof, phosphates, hydrocarbon oils, polyethers, silicone polymers and amides.

6. The dimer acid-modified epoxy ballast tank coating according to claim 1, wherein the anti-sagging agent is one of amide wax and amide wax-modified castor oil derivatives.

7. The dimer acid-modified epoxy ballast tank coating according to claim 1, wherein the anti-settling agent is one of organobentonite, polyolefin wax, silica aerogel, aluminum stearate, and hydrogenated castor oil.

8. The dimer acid-modified epoxy ballast tank coating according to claim 1, wherein the curing agent is one of a polyamide-based curing agent, a polyamide adduct, an amidoamine, and a modified amine.

9. The method for preparing the dimer acid-modified epoxy ballast tank coating according to any one of claims 1 to 8, which comprises the steps of preparing the component A, preparing the component B and spraying the component A and the component B after mixing, wherein the step of spraying the component A and the component B

The preparation of the component A comprises the following steps:

s1, preparation of aluminum paste: sequentially adding aluminum paste, n-butyl alcohol and benzyl alcohol which meet the formula requirements into a reaction kettle according to the percentage, after soaking for 30-60min, controlling the rotating speed at 200-600r/min, and controlling the dispersion time to be 15-40min, wherein the dispersion liquid is uniform and does not have the phenomena of bottom-sinking agglomeration, particles and the like, so that the self-made aluminum paste is obtained, and the aluminum paste is used as it is when being prepared;

s2, adding the dimer acid modified epoxy resin, the epoxy resin and the xylene which meet the formula requirements into a reaction kettle according to the formula proportion, stirring at a low speed, controlling the rotating speed at 500r/min, adding the anti-sagging agent in the state, and increasing the rotating speed to 1200-1500r/min after the addition is finished, and dispersing at a high speed for 15-20 min;

s3, adding feldspar powder, talcum powder, defoamer, anti-settling agent and benzyl alcohol at one time, continuously stirring, heating to 50-70 ℃, keeping the temperature for 20-40min, adding self-made silver-aluminum paste, continuously dispersing for 5-10min, checking the fineness to be less than or equal to 70, stopping stirring, and discharging to obtain the component A.

The preparation of the component B comprises the following steps:

adding one of Q1, a polyamide curing agent, a polyamide adduct, amidoamine and modified amine and a xylene solvent into a reaction kettle according to a mass ratio, and dispersing at a high speed;

q2, and then standing for stabilization;

q3, filtering again, and packaging to obtain a finished product;

the spraying after the component A and the component B are mixed comprises the following steps:

w1, and the prepared A, B component is uniformly mixed according to the mass ratio of A to B (8-10) to 1;

w2, diluted with 7-15% xylene solvent;

w3, and spraying the paint on the surface of the object to be sprayed.

10. The method for preparing the dimer acid-modified epoxy ballast tank coating according to claim 9, wherein the mixing ratio of the component A to the component B is preferably 9: 1; preferably, the mass of the xylene solvent added in the mixing stage of the A component and the B component is 8 percent of the mass of the A component.

Technical Field

The invention relates to the field of chemical coatings, in particular to a seawater-resistant oil-resistant elastic epoxy ballast tank coating and a preparation method thereof.

Background

Under the wet alternation's condition of doing that marine vessel ballast tank is in for a long time, seawater corrosivity is extremely strong, and is in the load pressure state for a long time, and actual operational environment is very abominable, and simultaneously at the boats and ships operation in-process, cleaning and maintenance work are difficult to go on, therefore the corrosion protection of ballast tank is very important to guaranteeing boats and ships safety. At present, the coating of the anticorrosive paint is the most main means for preventing the corrosion of the ballast tank.

Epoxy resins are widely used in various fields, particularly in the field of coatings, because of their excellent properties. However, the commercially available epoxy resin is mainly of a bisphenol a resin structure, and the bisphenol a epoxy resin has the characteristics of good comprehensive mechanical properties, high-strength adhesive force, small shrinkage, good thermal stability, excellent electrical insulation and the like, and is widely applied to the fields of ships, machinery, electronics, electricity, aerospace and the like as a resin matrix of a coating material. However, the cured epoxy resin has high crosslinking density and large internal stress, so that the cured epoxy resin has the defects of poor toughness, fatigue resistance, heat resistance, impact resistance and the like, and the performance requirements of many practical engineering technologies are difficult to meet, so that the application of the cured epoxy resin is limited to a certain extent.

Particularly in the application scene of the ballast tank, the coating of the epoxy resin paint used by the ballast tank needs to solve the problem that the elasticity is needed for seawater resistance, salt mist resistance and oil resistance.

Disclosure of Invention

The invention aims to provide a seawater-resistant oil-resistant elastic epoxy ballast tank coating, which is obtained by introducing dimer acid epoxy resin into an epoxy coating taking a bisphenol A resin structure as a main component and utilizing the synergistic curing effect of a curing agent to obtain the epoxy ballast tank coating with excellent comprehensive performance. The coating comprises a component A and a component B;

wherein the component A comprises the following components in percentage by mass:

the component B comprises the following raw materials in parts by mass:

90 to 95 percent of curing agent

5-10% of xylene solvent

When the component A and the component B are used, the mass ratio of A to B is (8-10):1 in proportion;

the curing agent of the component B is one of polyamide curing agent, polyamide adduct, amidoamine and modified amine.

Further, the dimer acid modified resin has a viscosity of 900 to 1500mPa.s (25 ℃), and an epoxy equivalent of 280 to 600.

Further, the epoxy resin is selected from resins with an epoxy equivalent of 100-500.

Further, the self-made aluminum paste comprises the following components:

40-75% of aluminum paste

15-30% of n-butyl alcohol

10-20% of benzyl alcohol.

Further, the defoaming agent is one of higher alcohols, fatty acids and salts thereof, phosphates, hydrocarbon oils, polyethers, organic silicon polymers and amides.

Further, the anti-sagging agent is one of amide wax and amide wax modified castor oil derivatives.

Further, the anti-settling agent is one of organic bentonite, polyolefin wax, silica aerogel, aluminum stearate and hydrogenated castor oil.

The curing agent is one of a polyamide curing agent, a polyamide adduct, an amidoamine, and a modified amine.

The invention also provides a preparation method of the seawater-resistant oil-resistant elastic epoxy ballast tank coating, which comprises the following steps: comprises the preparation of component A, the preparation of component B and the spraying after the mixing of the component A and the component B, wherein

The preparation of the component A comprises the following steps:

s1, preparation of aluminum paste: sequentially adding aluminum paste, n-butyl alcohol and benzyl alcohol which meet the formula requirements into a reaction kettle according to the percentage, after soaking for 30-60min, controlling the rotating speed at 200-600r/min, and controlling the dispersion time to be 15-40min, wherein the dispersion liquid is uniform and does not have the phenomena of bottom-sinking agglomeration, particles and the like, so that the self-made aluminum paste is obtained, and the aluminum paste is used as it is when being prepared;

s2, adding the dimer acid modified epoxy resin, the epoxy resin and the xylene which meet the formula requirements into a reaction kettle according to the formula proportion, stirring at a low speed, controlling the rotating speed at 500r/min, adding the anti-sagging agent in the state, and increasing the rotating speed to 1200-1500r/min after the addition is finished, and dispersing at a high speed for 15-20 min;

s3, adding feldspar powder, talcum powder, defoamer, anti-settling agent and benzyl alcohol at one time, continuously stirring, heating to 50-70 ℃, keeping the temperature for 20-40min, adding self-made silver-aluminum paste, continuously dispersing for 5-10min, checking the fineness to be less than or equal to 70, stopping stirring, and discharging to obtain the component A.

The preparation of the component B comprises the following steps:

adding one of Q1, a polyamide curing agent, a polyamide adduct, amidoamine and modified amine and a xylene solvent into a reaction kettle according to a mass ratio, and dispersing at a high speed;

q2, standing for stabilization after dispersion;

q3, filtering and packaging to obtain the finished product.

The spraying after the component A and the component B are mixed comprises the following steps:

w1, and the prepared A, B component is uniformly mixed according to the mass ratio of A to B (8-10) to 1;

w2, diluted with 7-15% xylene solvent;

w3, and spraying the paint on the surface of the object to be sprayed.

Preferably, the mixing ratio of the component A to the component B is 9: 1; preferably, the mass of the xylene solvent added in the mixing and diluting stage of the A component and the B component is 8 percent of the mass of the A component.

The seawater-resistant oil-resistant elastic epoxy ballast tank coating provided by the invention has the following advantages:

(1) in the component A of the technical scheme, the viscosity of the used dimer acid modified epoxy resin is similar to that of the traditional E-44 epoxy resin, but the epoxy value is lower, and the dimer acid structure is introduced into the molecular structure, so that the resin has good compatibility with a polyamide curing agent, and meanwhile, the benzene ring structure of the original epoxy resin is reserved in the molecular structure, so that the dimer acid modified epoxy resin has good compatibility with phenol-aldehyde amine, and the state is more stable in the preparation process of a paint film;

(2) the glass transition temperature of a paint film cured by the dimer acid modified epoxy resin is lower, the dimer acid epoxy resin can introduce a flexible chain segment into a chain segment of the epoxy resin, the density of methyl and benzene rings in a resin molecular structure is reduced, the influence of steric hindrance of the methyl and the benzene rings is reduced, the chain segment movement capacity of the resin is increased, the brittleness of a cured product of the resin is improved, and the paint film has more excellent flexibility, so that the paint film has certain elasticity;

(3) compared with the traditional epoxy coating system, the addition of a certain amount of dimer acid modified epoxy resin has lower viscosity and excellent physical and mechanical properties; particularly, when the phenolic aldehyde amine is used as a curing agent, the physical and mechanical properties of the epoxy resin are obviously superior to those of the traditional epoxy system;

(4) through analysis of the corrosion resistance and the chemical resistance, the epoxy resin coating modified by adding a certain amount of dimer acid has good corrosion resistance and chemical resistance;

(5) tests show that the epoxy coating developed by the dimer acid modified epoxy resin has good compatibility with shop primers, and the matching system can meet the matching requirements issued by maritime organization (IMO).

Drawings

FIG. 1 is a flow chart for preparing component A;

FIG. 2 is a flow chart of the preparation of component B;

FIG. 3 is a comparison graph of the salt spray resistance test effect, wherein 1-shows the effect of the common coating spraying sample plate after the salt spray test, and the surface paint film falls off; 2-the effect of the coating spraying sample plate is tested by salt spray resistance, and a paint film does not fall off;

FIG. 4 is a diagram showing the effect of an artificial seawater resistance experiment, wherein 3-shows the effect of the coating spraying sample plate of the present invention after being soaked in artificial seawater, and the conditions of no generation of bubbles, rusting, falling off, etc. are presented.

Detailed Description

The dimer acid modified epoxy ballast tank coating is obtained by introducing dimer acid epoxy resin into epoxy coating taking a bisphenol A resin structure as a main component and utilizing the synergistic curing effect of a curing agent to obtain the epoxy ballast tank coating with excellent comprehensive performance. The coating comprises a component A and a component B;

wherein the component A comprises the following components in percentage by mass:

the component B comprises the following raw materials in parts by mass:

90 to 95 percent of curing agent

5-10% of a xylene solvent;

when the component A and the component B are used, the mass ratio of A to B is (8-10):1 in proportion;

the curing agent of the component B is one of polyamide curing agent, polyamide adduct, amidoamine and modified amine.

The viscosity of the dimer acid modified resin is 900-1500 mPa.s (at 25 ℃), and the epoxy equivalent is 280-600;

the epoxy resin is selected from resins with the epoxy equivalent of 100-500;

the self-made aluminum paste comprises the following components:

40-75% of aluminum paste

15-30% of n-butyl alcohol

10-20% of benzyl alcohol.

The defoaming agent is one of higher alcohols, fatty acid and salts thereof, phosphate esters, hydrocarbon oils, polyethers, organic silicon polymers and amides.

The anti-sagging agent is one of amide wax and amide wax modified castor oil derivatives.

The anti-settling agent is one of organic bentonite, polyolefin wax, silicon dioxide aerogel, aluminum stearate and hydrogenated castor oil.

The curing agent is one of polyamide curing agent, polyamide adduct, amidoamine and modified amine.

The dimer acid modified epoxy ballast tank coating of the invention was tested according to the main technical specifications of table 1.

TABLE 1 Main technical indices of the national standard epoxy ballast tank coating

The invention relates to an A, B type bi-component crosslinking reaction seawater-resistant oil-resistant elastic epoxy ballast tank coating, the spraying mode of the coating mainly comprises paint spraying and high-pressure airless spraying, the thickness of each dry film of the airless spraying is 25-30 mu m, and 4 spraying is recommended; the dry film thickness of each high-pressure airless spraying is 50-80 μm, 2 spraying is recommended, the implementation case of the patent is mainly to prepare various detection templates through airless spraying, the invention is further described in detail by combining 5 examples, but is not limited to the description, and the formulas of examples 1-5 are shown in table 2.

Table 2 formulations of examples 1-5

Example 1

The preparation of the component A comprises the following steps:

s1, preparation of aluminum paste: sequentially adding aluminum paste, n-butyl alcohol and benzyl alcohol which meet the formula requirements into a reaction kettle according to the percentage, soaking for 30min, controlling the rotating speed at 200r/min, and dispersing for 40min, wherein the dispersion liquid is uniform and has no phenomena of bottom sedimentation agglomeration, particles and the like, so that the self-made aluminum paste is obtained, and the aluminum paste is used in situ;

s2, adding the dimer acid modified epoxy resin, the epoxy resin and the xylene which meet the formula requirements into a reaction kettle according to the formula proportion, stirring at a low speed, controlling the rotating speed at 300r/min, adding the anti-sagging agent in the state, and after the addition is finished, increasing the rotating speed to 1200r/min and dispersing at a high speed for 20 min;

s3, adding feldspar powder, talcum powder, defoamer, anti-settling agent and benzyl alcohol at one time, continuously stirring, heating to 50 ℃, keeping the temperature for 40min, adding self-made silver-aluminum paste, continuously dispersing for 5min, checking the fineness to be less than or equal to 70, stopping stirring, and discharging to obtain the component A.

The preparation of the component B comprises the following steps:

adding one of Q1, a polyamide curing agent, a polyamide adduct, amidoamine and modified amine and a xylene solvent into a reaction kettle according to a mass ratio, and dispersing at a high speed;

q2, standing for stabilization after dispersion;

q3, filtering and packaging to obtain the finished product.

A, B prepared according to the formulation of example 1 were mixed uniformly in a mass ratio of A: B: 9:1, diluted with 8% xylene solvent, and subjected to a performance test using a coating sample prepared by air-blasting, the test results of which are shown in Table 3

Table 3 example 1 prototype performance test results

Example 2

The preparation of the component A comprises the following steps:

s1, preparation of aluminum paste: sequentially adding aluminum paste, n-butyl alcohol and benzyl alcohol which meet the formula requirements into a reaction kettle according to the percentage, after soaking for 40min, controlling the rotating speed at 300r/min, and controlling the dispersion time to be 20min, wherein the dispersion liquid is uniform and has no phenomena of bottom settlement agglomeration, particles and the like, so that the self-made aluminum paste is obtained, and the aluminum paste is used in situ;

s2, adding the dimer acid modified epoxy resin, the epoxy resin and the xylene which meet the formula requirements into a reaction kettle according to the formula proportion, stirring at a low speed, controlling the rotating speed at 400r/min, adding the anti-sagging agent in the state, and after the addition is finished, increasing the rotating speed to 1300r/min and dispersing at a high speed for 17 min;

s3, adding feldspar powder, talcum powder, defoamer, anti-settling agent and benzyl alcohol at one time, continuously stirring, heating to 60 ℃, keeping the temperature for 30min, adding self-made silver-aluminum paste, continuously dispersing for 7min, checking the fineness to be less than or equal to 70, stopping stirring, and discharging to obtain the component A.

The preparation of the component B comprises the following steps:

adding one of Q1, a polyamide curing agent, a polyamide adduct, amidoamine and modified amine and a xylene solvent into a reaction kettle according to a mass ratio, and dispersing at a high speed;

q2, standing for stabilization after dispersion;

q3, filtering and packaging to obtain the finished product.

A, B prepared according to the formulation of example 2 were mixed uniformly in a mass ratio of A: B-9: 1, diluted with 10% xylene solvent, and subjected to a performance test using a sample prepared by air-blasting, the test results of which are shown in Table 4

Table 4 example 2 prototype performance test results

Example 3

The preparation of the component A comprises the following steps:

s1, preparation of aluminum paste: sequentially adding aluminum paste, n-butyl alcohol and benzyl alcohol which meet the formula requirements into a reaction kettle according to the percentage, soaking for 50min, controlling the rotating speed at 400r/min, and dispersing for 25min, wherein the dispersion liquid is uniform and has no phenomena of bottom sedimentation agglomeration, particles and the like, so that the self-made aluminum paste is obtained, and the aluminum paste is used in situ;

s2, adding the dimer acid modified epoxy resin, the epoxy resin and the xylene which meet the formula requirements into a reaction kettle according to the formula proportion, stirring at a low speed, controlling the rotating speed at 500r/min, adding the anti-sagging agent in the state, and after the addition is finished, increasing the rotating speed to 1400r/min and dispersing at a high speed for 15 min;

s3, adding feldspar powder, talcum powder, defoamer, anti-settling agent and benzyl alcohol at one time, continuously stirring, heating to 70 ℃, keeping the temperature for 20min, adding self-made silver-aluminum paste, continuously dispersing for 8min, checking the fineness to be less than or equal to 70, stopping stirring, and discharging to obtain the component A.

The preparation of the component B comprises the following steps:

adding one of Q1, a polyamide curing agent, a polyamide adduct, amidoamine and modified amine and a xylene solvent into a reaction kettle according to a mass ratio, and dispersing at a high speed;

q2, standing for stabilization after dispersion;

q3, filtering and packaging to obtain the finished product.

A, B prepared according to the formulation of example 3 were mixed uniformly in a mass ratio of A: B: 9:1, diluted with 10% xylene solvent, and subjected to a performance test using a sample prepared by air-blasting, the test results of which are shown in Table 5

Table 5 example 3 sample performance test results

Example 4

The preparation of the component A comprises the following steps:

s1, preparation of aluminum paste: sequentially adding aluminum paste, n-butyl alcohol and benzyl alcohol which meet the formula requirements into a reaction kettle according to the percentage, soaking for 60min, controlling the rotating speed at 200r/min, and dispersing for 30min, wherein the dispersion liquid is uniform and free of bottom sedimentation agglomeration, particles and the like, so that the self-made aluminum paste is obtained, and the aluminum paste is used in situ;

s2, adding dimer acid modified epoxy resin, epoxy resin and xylene which meet the formula requirements into a reaction kettle according to the formula proportion, stirring at a low speed, controlling the rotating speed at 350r/min, adding an anti-sagging agent in the state, and after the addition is finished, increasing the rotating speed to 1450r/min and dispersing at a high speed for 19 min;

s3, adding feldspar powder, talcum powder, defoamer, anti-settling agent and benzyl alcohol at one time, continuously stirring, heating to 65 ℃, keeping the temperature for 25min, adding self-made silver-aluminum paste, continuously dispersing for 10min, checking the fineness to be less than or equal to 70, stopping stirring, and discharging to obtain the component A.

The preparation of the component B comprises the following steps:

adding one of Q1, a polyamide curing agent, a polyamide adduct, amidoamine and modified amine and a xylene solvent into a reaction kettle according to a mass ratio, and dispersing at a high speed;

q2, standing for stabilization after dispersion;

q3, filtering and packaging to obtain the finished product.

The A, B components prepared according to the formulation of example 4 were mixed uniformly in a mass ratio of a: B to 9:1, diluted with 10% xylene solvent, and then subjected to a test using a sample prepared by air-blasting, and the test results are shown in table 6.

Table 6 example 4 sample performance test results

Example 5

The preparation of the component A comprises the following steps:

s1, preparation of aluminum paste: sequentially adding aluminum paste, n-butyl alcohol and benzyl alcohol which meet the formula requirements into a reaction kettle according to the percentage, soaking for 60min, controlling the rotating speed at 600r/min, and dispersing for 40min, wherein the dispersion liquid is uniform and free of bottom sedimentation agglomeration, particles and the like, so that the self-made aluminum paste is obtained, and the aluminum paste is used in situ;

s2, adding the dimer acid modified epoxy resin, the epoxy resin and the xylene which meet the formula requirements into a reaction kettle according to the formula proportion, stirring at a low speed, controlling the rotating speed at 350r/min, adding the anti-sagging agent in the state, and increasing the rotating speed to 1250r/min after the addition is finished, and dispersing at a high speed for 18 min;

s3, adding feldspar powder, talcum powder, defoamer, anti-settling agent and benzyl alcohol at one time, continuously stirring, heating to 70 ℃, keeping the temperature for 35min, adding self-made silver-aluminum paste, continuously dispersing for 7min, checking the fineness to be less than or equal to 70, stopping stirring, and discharging to obtain the component A.

The preparation of the component B comprises the following steps:

adding one of Q1, a polyamide curing agent, a polyamide adduct, amidoamine and modified amine and a xylene solvent into a reaction kettle according to a mass ratio, and dispersing at a high speed;

q2, standing for stabilization after dispersion;

q3, filtering and packaging to obtain the finished product.

The A, B components prepared according to the formulation of example 5 were mixed uniformly in a mass ratio of a: B to 9:1, diluted with 10% xylene solvent, and then subjected to a test using a sample prepared by air-blasting, and the test results are shown in table 7.

Table 7 results of performance testing of samples of example 5

To summarize: through comprehensive analysis of the above 5 examples, the example 1 is most ideal in comprehensive performance test, and other examples far exceed the standard requirements, wherein the increase of the amount of the dimer acid-modified epoxy resin obviously improves each performance of the paint film, but the performance is not obviously improved when the ratio exceeds a certain ratio (example 5), and the adhesion is reduced. According to the analysis of practical experiments, when the component A: B is more than 9:1, the paint film has good flexibility, but the adhesive force is reduced, and the ratio of A to B is less than 9:1, the paint film adhesion is improved but the flexibility is reduced, so that the formula has the following components in percentage by weight, wherein B is 9:1 is the best implementation ratio.