A coating prepared using modified carbon black

Abstract

This invention relates to the field of coating preparation technology, specifically disclosing a coating prepared using modified carbon black. The process involves adding zinc or aluminum compounds during carbon black manufacturing to prepare aluminum / carbon black composites and zinc / carbon black composites. These composites are then formulated in different proportions to obtain modified carbon black, which is then combined with epoxy resin, dispersant, solvent, mica powder, barium sulfate, fumed silica, leveling agent, defoamer, and polyamide to prepare coatings with different properties. The coatings prepared using modified carbon black exhibit enhanced corrosion resistance, anti-aging properties, insulation properties, hardness, and abrasion resistance.

Description

Technical Field

[0001] This invention relates to the field of coating preparation technology, and specifically to a coating prepared using modified carbon black. Background Technology

[0002] With the high-quality development of the industrial and construction sectors, the coatings industry has put forward higher requirements for coating performance, such as mechanical properties, adhesion, elasticity, and hydrophobicity / hydrophobicity. This can protect the substrate from damage, improve the service life of the substrate, and reduce costs.

[0003] Currently, the main types of coatings used in the market include acrylic coatings, polyurethane coatings, and epoxy coatings. Acrylic coatings have high hardness and strong impact resistance, but their viscosity is too high, resulting in a lower decorative effect. Polyurethane coatings are highly adaptable to substrate expansion and contraction or cracking, and have high tensile strength, but their hardness is relatively low, requiring strict application conditions and are expensive. Epoxy coatings have strong corrosion resistance and good mechanical properties, but their weather resistance is poor, they are prone to discoloration and chalking, and they also have high requirements for the application environment and poor decorative properties. Each type of coating has its own advantages and disadvantages. Downstream users have increasingly higher requirements for the application performance of coatings, such as breathability, mechanical strength, hydrophobicity, adhesion between the coating and the substrate, and UV resistance. Therefore, to meet the needs of downstream customers, it is necessary to develop coatings with corresponding functions. For example, adding carbon black to epoxy resin coatings can improve the strength, hardness, conductivity, and antistatic properties of the coating, but it cannot meet the needs of applications requiring insulation. Therefore, to meet user needs, the development of new coatings with specific properties has become a research focus. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a coating prepared using modified carbon black, which replaces the unmodified carbon black material in the prior art. The prepared coating has stronger anti-corrosion performance, anti-aging performance, insulation performance, hardness and wear resistance.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A coating prepared using modified carbon black is obtained by the following method:

[0007] a. Accurately weigh 100 parts by weight of epoxy resin, 0.8 to 1.2 parts by weight of dispersant, 4 to 8 parts by weight of modified carbon black and 10 to 15 parts by weight of solvent, add them to a mixing tank, and pre-disperse at 2000 rpm for 10 minutes.

[0008] b. Transfer the pre-dispersed slurry to a sand mill, add grinding media, and grind at 1500-2000 rpm for 2-3 hours to obtain modified carbon black-epoxy resin mother liquor;

[0009] c. Transfer the modified carbon black-epoxy resin mother liquor obtained in step b to a planetary mixer. While stirring at 500 rpm, add 10 parts by weight of mica powder and 15 parts by weight of barium sulfate in sequence. Increase the speed to 1000-1200 rpm and continue stirring for 20-30 minutes until homogeneous. Then reduce the speed to 400 rpm and slowly add 1.5 parts by weight of fumed silica. After the addition is complete, immediately disperse at 1200 rpm for 10 minutes. Then add 0.2 parts by weight of leveling agent, 0.3 parts by weight of defoamer, and 10-15 parts by weight of solvent in sequence. Stir at 800 rpm for 10-15 minutes to mix thoroughly.

[0010] d. Transfer the slurry obtained in step c to a vacuum degassing machine, evacuate to -0.095 MPa at 50 rpm, and maintain for 20 to 30 minutes until no bubbles overflow, to obtain component A coating;

[0011] e. While preparing component A coating, prepare component B coating. Dilute the polyamide with a small amount of solvent (the total amount is controlled during the preparation of component A and component B, so that the total amount of all solvents in components A and B does not exceed 30 parts by weight) to obtain component B coating (the weight ratio of component A coating to component B coating is 100:40 when used); thus, the coating prepared from modified carbon black is obtained.

[0012] The modified carbon black is prepared by adding aluminum compounds and zinc compounds during the carbon black preparation process, respectively, to obtain aluminum / carbon black composites and zinc / carbon black composites, and the aluminum / carbon black composites and zinc / carbon black composites are prepared in a weight ratio of 0-100:100-0.

[0013] Preferably, in step a, the epoxy resin is epoxy resin E-51, the dispersant is dispersant BYK-163, and the solvent is a mixed solvent of xylene and n-butanol in a volume ratio of 7:3; the dispersant is 1.0 parts by weight, the modified carbon black is 6 parts by weight, and the solvent is 12 parts by weight; the modified carbon black is a zinc / carbon black composite.

[0014] Preferably, the method for preparing the modified carbon black in step a is as follows:

[0015] Step 1: Carbon Black Generation: Similar to conventional furnace carbon black production, feedstock oil (coal tar) and preheated oxygen-enriched air are injected from the head of the reactor, with an air / oil ratio of 3.5 Nm. 3 / kg of oil undergoes incomplete combustion and thermal decomposition at high temperatures of 1400–1600 ℃, with a residence time of tens of milliseconds, producing carbon black.

[0016] Step 2: Metal Precursor Injection: Downstream of the reaction section of the reactor, in the region where the temperature drops to approximately 1000 ℃, a prepared 0.5 mol / L zinc acetate aqueous solution or a 0.5 mol / L aluminum nitrate (Al(NO3)3·9H2O) ethanol solution is uniformly and stably injected into the flue gas / carbon black gas stream through a dual-fluid atomizing nozzle. Atomization pressure: 0.5 MPa; Injection rate: precisely controlled; the amount of zinc acetate or aluminum nitrate added is 5 wt% of the carbon black.

[0017] Step 3: Reaction and Composite: The atomized droplets rapidly evaporate and decompose at high temperature, and the resulting oxide nanoparticles collide, adsorb, and encapsulate with the high-speed moving carbon black particles to form a composite.

[0018] Step 4: Rapid cooling and collection: Same as the standard process, rapid cooling water is sprayed into the set position, and the rapid cooling temperature is 650℃ to terminate the reaction; then the zinc / carbon black composite or aluminum / carbon black composite is collected through a cyclone separator and bag filter.

[0019] Step 5: Post-processing: The collected zinc / carbon black composite or aluminum / carbon black composite is calcined at 500℃ under an inert atmosphere to remove residual solvent and incompletely decomposed precursors, thereby obtaining a stable zinc / carbon black composite or aluminum / carbon black composite; the zinc / carbon black composite or aluminum / carbon black composite is prepared by mixing the zinc / carbon black composite or aluminum / carbon black composite at a weight ratio of 0~100:100~0 to obtain modified carbon black.

[0020] Preferably, in step b, the sand mill is a vertical sand mill, the grinding media is zirconia beads with a diameter of 0.6 to 0.8 mm, and the filling amount is 60 to 70%; the material temperature is controlled below 50°C during grinding, the grinding speed is 1800 rpm, and the grinding time is 2.5 hours.

[0021] Preferably, in step c, the leveling agent is leveling agent BYK-331, the defoamer is defoamer BYK-066N, and the solvent is a mixed solvent of xylene and n-butanol with a volume ratio of 7:3; the stirring speed is increased to 1100 rpm and then stirred for 25 minutes until uniform; the amount of solvent added is 12 parts by weight, and the stirring is carried out at 800 rpm for 13 minutes.

[0022] Preferably, the defoaming maintenance time in step d is 25 minutes.

[0023] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] This invention prepares aluminum / carbon black composites and zinc / carbon black composites by adding zinc and aluminum compounds during the carbon black preparation process. Because the metal ions are simultaneously embedded during carbon black growth, they can be uniformly distributed in the carbon black particles. Compared with other metal-carbon black composites prepared by surface adsorption, these composites exhibit stronger stability and dispersibility. Furthermore, by utilizing the different effects of aluminum (hardness, wear resistance, corrosion resistance, etc.) and zinc (corrosion resistance, UV shielding, etc.), different ratios of the two metal compounds can be used to prepare coating products with varying performance requirements, thus meeting user needs. Detailed Implementation

[0025] The technical solution of the present invention will be further described below with reference to embodiments:

[0026] Example 1: Preparation of Modified Carbon Black

[0027] Step 1: Carbon Black Generation: Similar to conventional furnace carbon black production, feedstock oil (coal tar) and preheated oxygen-enriched air are injected from the head of the reactor, with an air / oil ratio of 3.5 Nm. 3 / kg of oil undergoes incomplete combustion and thermal decomposition at high temperatures of 1400–1600 ℃, with a residence time of tens of milliseconds, producing carbon black.

[0028] Step 2: Metal Precursor Injection: Downstream of the reaction section of the reactor, in the region where the temperature drops to approximately 1000 ℃, a prepared 0.5 mol / L zinc acetate aqueous solution or a 0.5 mol / L aluminum nitrate (Al(NO3)3·9H2O) ethanol solution is uniformly and stably injected into the flue gas / carbon black gas stream through a dual-fluid atomizing nozzle. Atomization pressure: 0.5 MPa; Injection rate: precisely controlled; the amount of zinc acetate or aluminum nitrate added is 5 wt% of the carbon black.

[0029] Step 3: Reaction and Composite: The atomized droplets rapidly evaporate and decompose at high temperature, and the resulting oxide nanoparticles collide, adsorb, and encapsulate with the high-speed moving carbon black particles to form a composite.

[0030] Step 4: Rapid cooling and collection: Same as the standard process, spray rapid cooling water at the set position, the rapid cooling temperature is 650℃, and the reaction is terminated; then collect the zinc / carbon black compound or aluminum / carbon black compound through a cyclone separator and bag filter.

[0031] Step 5: Post-processing: The collected zinc / carbon black composite or aluminum / carbon black composite is calcined at 500°C under an inert atmosphere to remove residual solvents and incompletely decomposed precursors, thereby obtaining a stable zinc / carbon black composite or aluminum / carbon black composite; the zinc / carbon black composite and aluminum / carbon black composite are prepared by mixing them in a weight ratio of 0-100:100-0.

[0032] Example 2: Preparation of Coatings

[0033] a. Accurately weigh 100 parts by weight of epoxy resin, 0.8 parts by weight of dispersant, 4 parts by weight of modified carbon black (zinc / carbon black composite and aluminum / carbon black composite in a weight ratio of 50:50) and 15 parts by weight of solvent (a mixed solvent of xylene and n-butanol in a volume ratio of 7:3), add them to a mixing tank, and pre-disperse at 2000 rpm for 10 minutes;

[0034] b. Transfer the pre-dispersed slurry to a sand mill, add grinding media, and grind at 1500 rpm for 3 hours to obtain modified carbon black-epoxy resin mother liquor;

[0035] c. Transfer the modified carbon black-epoxy resin mother liquor obtained in step b to a planetary mixer. While stirring at 500 rpm, add 10 parts by weight of mica powder and 15 parts by weight of barium sulfate in sequence. Increase the speed to 1000 rpm and continue stirring for 30 minutes until homogeneous. Then reduce the speed to 400 rpm and slowly add 1.5 parts by weight of fumed silica. Immediately after the addition, disperse at 1200 rpm for 10 minutes. Then add 0.2 parts by weight of leveling agent, 0.3 parts by weight of defoamer, and 10 parts by weight of solvent (a mixed solvent of xylene and n-butanol with a volume ratio of 7:3). Stir at 800 rpm for 10 minutes to mix thoroughly.

[0036] d. Transfer the slurry obtained in step c to a vacuum degassing machine, evacuate to -0.095 MPa at 50 rpm, maintain for 20 minutes until no bubbles overflow, and obtain component A coating;

[0037] e. While preparing component A coating, component B coating is also prepared. 57 parts by weight of polyamide are diluted with 5 parts by weight of the solvent used to prepare component A coating to obtain component B coating (the weight ratio of component A coating to component B coating is approximately 100:40 when used); thus, the coating prepared from modified carbon black is obtained.

[0038] Example 3: Preparation of Coating II

[0039] a. Accurately weigh 100 parts by weight of epoxy resin, 1.2 parts by weight of dispersant, 8 parts by weight of modified carbon black (zinc / carbon black composite and aluminum / carbon black composite in a weight ratio of 50:50) and 10 parts by weight of solvent (same as in Example 2), add them to a mixing tank, and pre-disperse them at 2000 rpm for 10 minutes.

[0040] b. Transfer the pre-dispersed slurry to a sand mill, add grinding media, and grind at 2000 rpm for 2 hours to obtain modified carbon black-epoxy resin mother liquor;

[0041] c. Transfer the modified carbon black-epoxy resin mother liquor obtained in step b to a planetary mixer. While stirring at 500 rpm, add 10 parts by weight of mica powder and 15 parts by weight of barium sulfate in sequence. Increase the speed to 1200 rpm and continue stirring for 20 minutes until homogeneous. Then reduce the speed to 400 rpm and slowly add 1.5 parts by weight of fumed silica. After the addition is complete, immediately disperse at 1200 rpm for 10 minutes. Then add 0.2 parts by weight of leveling agent, 0.3 parts by weight of defoamer and 15 parts by weight of solvent (same as in Example 2) in sequence. Stir at 800 rpm for 15 minutes to mix thoroughly.

[0042] d. Transfer the slurry obtained in step c to a vacuum degassing machine, evacuate to -0.095 MPa at 50 rpm, maintain for 30 minutes until no bubbles overflow, and obtain component A coating;

[0043] e. While preparing component A coating, component B coating is also prepared. 59 parts by weight of polyamide are diluted with 5 parts by weight of the solvent used to prepare component A coating to obtain component B coating (the weight ratio of component A coating to component B coating is approximately 100:40 when used); thus, the coating prepared from modified carbon black is obtained.

[0044] Example 4: Preparation of Coatings (Part 3)

[0045] a. Accurately weigh 100 parts by weight of epoxy resin, 1.0 parts by weight of dispersant, 6 parts by weight of modified carbon black (zinc / carbon black composite and aluminum / carbon black composite in a weight ratio of 50:50) and 12 parts by weight of solvent (same as in Example 2), add them to a mixing tank, and pre-disperse them at 2000 rpm for 10 minutes.

[0046] b. Transfer the pre-dispersed slurry to a sand mill, add grinding media, and grind at 1800 rpm for 2.5 hours to obtain modified carbon black-epoxy resin mother liquor;

[0047] c. Transfer the modified carbon black-epoxy resin mother liquor obtained in step b to a planetary mixer. Add 10 parts by weight of mica powder and 15 parts by weight of barium sulfate sequentially while stirring at 500 rpm. Increase the speed to 1100 rpm and continue stirring for 25 minutes until homogeneous. Then reduce the speed to 400 rpm and slowly add 1.5 parts by weight of fumed silica. Immediately after the addition, disperse at 1200 rpm for 10 minutes. Then add 0.2 parts by weight of leveling agent, 0.3 parts by weight of defoamer, and 12 parts by weight of solvent (same as in Example 2) sequentially. Stir at 800 rpm for 13 minutes to mix thoroughly.

[0048] d. Transfer the slurry obtained in step c to a vacuum degassing machine, evacuate to -0.095 MPa at 50 rpm, maintain for 25 minutes until no bubbles overflow, and obtain component A coating;

[0049] e. While preparing component A coating, component B coating is also prepared. 57 parts by weight of polyamide are diluted with 5 parts by weight of the solvent used to prepare component A coating to obtain component B coating (the weight ratio of component A coating to component B coating is approximately 100:40 when used); thus, the coating prepared from modified carbon black is obtained.

[0050] Example 5: Preparation of Coating (Part 4)

[0051] In Example 4, the modified carbon black was replaced with a zinc / carbon black composite, while other conditions remained unchanged.

[0052] Example 6: Preparation of Coating (Part 5)

[0053] In Example 4, the modified carbon black was replaced with an aluminum / carbon black composite, while other conditions remained unchanged.

[0054] Example 7: Preparation of Coatings (Part 6)

[0055] The weight ratio of the modified carbon black zinc / carbon black composite to the aluminum / carbon black composite in Example 4 was changed to 30:70, while other conditions remained unchanged.

[0056] Example 8: Preparation of Coatings (Part 7)

[0057] The weight ratio of the modified carbon black zinc / carbon black composite to the aluminum / carbon black composite in Example 4 was changed to 70:30, while other conditions remained unchanged.

[0058] Comparative Example 1

[0059] The modified carbon black in Example 4 was replaced with ordinary carbon black prepared in Example 1 without the injection of metal precursors (metallic aluminum or metallic zinc) during the carbon black preparation process, while other conditions remained unchanged.

[0060] Product testing results and analysis:

[0061] The products obtained in Examples 2-8 and Comparative Example 1 were subjected to neutral salt spray test (ASTM B117), electrochemical impedance spectroscopy test (ASTM G106, impedance modulus value tested on a scratch-free coating at 0.01 Hz), potentiodynamic polarization test (ASTM G5 / G59, tested on a scratched sample), ultraviolet aging test (ASTM G154 (UVA-340 lamp)), surface resistivity test (ASTM D257), volume resistivity test (ASTM D257), pencil hardness test (ASTM D3363), and abrasion resistance test (ASTM D4060 (Tybean abrasion) CS-10 wheel, 1 kg load). The test results are shown in Table 1.

[0062] Table 1 Performance test results of products from Examples 2-8 and Comparative Example 1

[0063]

[0064] The results in Table 1 show that the corrosion resistance of the coatings was significantly improved after the modified carbon black replaced ordinary carbon black, with Example 5, which used only the zinc / carbon black composite, showing the best results. Electrochemical impedance spectroscopy data indicates that the modified carbon black provides better shielding, with higher zinc / carbon black composite content resulting in better shielding. UV aging tests also show that the modified carbon black has better anti-aging effects, with higher zinc / carbon black composite content leading to better anti-aging. Surface resistivity and volume resistivity tests indicate that the modified carbon black resulted in the loss of conductivity and good insulation properties. Pencil hardness and abrasion resistance tests show that the modified carbon black improved the hardness and abrasion resistance of the coatings, with the hardness and abrasion resistance increasing accordingly with increasing aluminum / carbon black composite content.

[0065] Therefore, through the above experiments, it is possible to prepare coating products with corresponding functional requirements by adjusting the weight ratio of zinc / carbon black composite to aluminum / carbon black composite in modified carbon black, according to the different performance requirements of users.

[0066] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A coating prepared using a modified carbon black, characterized by: Preparation method: a. accurately weighed 100 parts by weight of epoxy resin, 0.8-1.2 parts by weight of dispersant, 4-8 parts by weight of modified carbon black and 10-15 parts by weight of solvent, and then added into the stirring tank, pre-dispersed for 10 minutes at 2000 rpm; b. the pre-dispersed slurry was transferred to a sand mill, grinding media was added, 1500-2000 rpm, grinding for 2-3 hours, to obtain modified carbon black-epoxy resin mother liquor; c. the modified carbon black-epoxy resin mother liquor obtained in step b was transferred to a planetary mixer, 500 rpm stirring, 10 parts by weight of mica powder and 15 parts by weight of barium sulfate were added in turn, the stirring speed was increased to 1000-1200 rpm for 20-30 minutes until uniform; then the stirring speed was reduced to 400 rpm, 1.5 parts by weight of fumed silica was slowly added, and then immediately dispersed at 1200 rpm for 10 minutes; then 0.2 parts by weight of leveling agent, 0.3 parts by weight of defoaming agent and 10-15 parts by weight of solvent were added in turn, and stirred at 800 rpm for 10-15 minutes to fully mix; d. the slurry obtained in step c was transferred to a vacuum degassing machine, 50 rpm, vacuum to-0.095 MPa, maintained for 20-30 minutes until no bubbles overflowed, to obtain component A coating; e. while preparing component A coating, component B coating was prepared, a small amount of solvent was used to dilute polyamide to obtain component B coating; The modified carbon black prepared coating is obtained. The modified carbon black is an aluminum / carbon black composite and a zinc / carbon black composite prepared by adding aluminum compound and zinc compound respectively during the preparation of carbon black, and the aluminum / carbon black composite and the zinc / carbon black composite are prepared in a weight ratio of 0-100:100-0. The preparation method of the modified carbon black is as follows: Step one: carbon black generation: the same as ordinary furnace carbon black production, raw oil and preheated oxygen-rich air are sprayed from the head of the reaction furnace, the air / oil ratio is 3.5 Nm³ / kg oil, and incomplete combustion and thermal cracking occur at high temperature of 1400-1600 ℃, the residence time is tens of milliseconds, and carbon black is generated; Step two: metal precursor injection: in the downstream of the reaction section of the reaction furnace, when the temperature drops to about 1000 ℃, the prepared 0.5 mol / L zinc acetate aqueous solution or 0.5 mol / L aluminum nitrate ethanol solution is uniformly and stably sprayed into the flue gas / carbon black gas stream through a double-fluid atomizing nozzle, the atomizing pressure is 0.5 MPa; the injection rate is accurately controlled, and the addition amount of zinc acetate or aluminum nitrate is 5 wt% of carbon black; Step three: reaction and compounding: the atomized droplets rapidly evaporate and decompose at high temperature, and the generated oxide nanoparticles collide with, adsorb and wrap the high-speed moving carbon black particles to form a composite; Step four: quenching and collection: the same as the standard process, quenching water is sprayed at the set position to stop the reaction at a quenching temperature of 650 ℃; then the zinc / carbon black composite or aluminum / carbon black composite is collected through a cyclone separator and a bag filter; Step five: post-treatment: the collected zinc / carbon black composite or aluminum / carbon black composite is calcined at 500 DEG C under the protection of inert atmosphere to remove residual solvent and incomplete decomposition of the precursor, and a stable zinc / carbon black composite or aluminum / carbon black composite is obtained; the zinc / carbon black composite or aluminum / carbon black composite is prepared into modified carbon black at a weight ratio of 0-100:100-0.

2. The paint prepared using modified carbon black according to claim 1, characterized by: The epoxy resin in step a is epoxy resin E-51, the dispersant is dispersant BYK-163, and the solvent is a mixed solvent of dimethylbenzene:n-butanol at a volume ratio of 7:3; the dispersant is 1.0 parts by weight, the modified carbon black is 6 parts by weight, and the solvent is 12 parts by weight; the modified carbon black is a zinc / carbon black composite.

3. The paint prepared using modified carbon black according to claim 1, characterized by: The sand mill in step b is a vertical sand mill, the grinding medium is zirconia bead with a diameter of 0.6-0.8 mm, and the filling amount is 60-70%; the material temperature is controlled below 50 DEG C during grinding, the grinding speed is 1800 rpm, and the grinding time is 2.5 hours.

4. The paint prepared using modified carbon black according to claim 1, characterized by: The leveling agent in step c is leveling agent BYK-331, the defoaming agent is defoaming agent BYK-066N, and the solvent is a mixed solvent of dimethylbenzene:n-butanol at a volume ratio of 7:3; the stirring speed is increased to 1100 rpm and continuously stirred for 25 minutes until uniform, and the solvent is added at 12 parts by weight and stirred at 800 rpm for 13 minutes.

5. The paint prepared using modified carbon black according to claim 1, characterized by: The defoaming time in step d is 25 minutes.

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