Coating prepared from modified carbon black

Abstract

The invention relates to the technical field of coating preparation, and particularly discloses a coating prepared from modified carbon black, which is prepared by adding a zinc or aluminum compound in a carbon black manufacturing process to prepare an aluminum / carbon black compound and a zinc / carbon black compound, and then preparing the aluminum / carbon black compound and the zinc / carbon black compound according to different proportions to obtain modified carbon black. And preparing coatings with different properties from the epoxy resin, a dispersing agent, a solvent, mica powder, barium sulfate, fumed silica, a flatting agent, a defoaming agent and polyamide. The coating prepared from the modified carbon black has higher corrosion resistance, ageing resistance, insulating property, hardness and wear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paint preparation, in particular to a paint prepared by using modified carbon black. BACKGROUND

[0002] With the high-quality development of the industrial and construction fields, the paint industry has put forward higher requirements on the performance of the paint, such as mechanical properties, adhesion, elasticity, and hydrophilic and hydrophobic properties, which can protect the substrate from damage, improve the service life of the substrate, and reduce the cost.

[0003] The paint currently used in the market mainly includes acrylate paint, polyurethane paint, and epoxy paint. The acrylate paint has high hardness and strong impact resistance, but has too large viscosity and low decoration effect; the polyurethane paint has strong adaptability to the expansion or cracking of the substrate and high tensile strength, but has low hardness, strict construction conditions, and high price; the epoxy paint has strong corrosion resistance and good mechanical properties, but has poor weather resistance, is easy to discolor and powder, has high requirements on the construction environment, and has poor decoration. Each type of paint has its own advantages and disadvantages, and the downstream users have increasingly high requirements on the application performance of the paint, such as air permeability, mechanical strength, hydrophobicity, adhesion between the paint and the substrate, and ultraviolet resistance. Therefore, in order to meet the needs of downstream customers, it is necessary to develop corresponding functional paints, such as adding carbon black to the epoxy resin paint, which can improve the strength, hardness, and other properties of the paint, and improve the conductive performance and anti-static performance of the paint, but cannot meet the requirements of the application scenarios that require insulation. Therefore, developing new paints with specific properties has become a research focus to meet the needs of users. SUMMARY

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

[0005] To solve the above technical problems, the present application provides the following technical solutions:

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

[0007] a. Accurately weigh 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 add them to a stirring tank for pre-dispersion at a speed of 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 a modified carbon black-epoxy resin mother liquor;

[0009] c. The modified carbon black-epoxy resin mother liquor obtained in step b is transferred to a planetary mixer, 10 parts by weight of mica powder and 15 parts by weight of barium sulfate are added in turn under stirring at 500 rpm, the stirring speed is increased to 1000-1200 rpm for 20-30 minutes until uniform; then the stirring speed is reduced to 400 rpm, 1.5 parts by weight of fumed silica is slowly added, and immediately after the addition is completed, 1200 rpm is dispersed for 10 minutes; then 0.2 parts by weight of a leveling agent, 0.3 parts by weight of a defoaming agent, and 10-15 parts by weight of a solvent are added in turn, and stirred at 800 rpm for 10-15 minutes, and fully mixed;

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

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

[0012] The modified carbon black is an aluminum / carbon black composite and a zinc / carbon black composite prepared by adding aluminum compounds and zinc compounds 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.

[0013] Preferably, 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 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 preparation method of the modified carbon black in step a is:

[0015] Step one: carbon black generation: the same as ordinary furnace carbon black production, raw oil (coal tar) and preheated oxygen-rich air are sprayed from the head of the reaction furnace, the air / oil ratio is 3.5 Nm 3 / kg oil, incomplete combustion and thermal cracking occur at high temperature 1400-1600 ℃, the residence time is tens of milliseconds, and carbon black is generated;

[0016] Step two: metal precursor injection: in the area downstream of the reaction section of the reaction furnace, where the temperature drops to about 1000 DEG C, the prepared 0.5 mol / L zinc acetate aqueous solution or 0.5 mol / L aluminum nitrate (Al(NO3)3.9H2O) ethanol solution is uniformly and stably injected into the flue gas / carbon black 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 the carbon black;

[0017] Step three: reaction and compounding: the atomized droplets rapidly evaporate at high temperature, decompose, and the generated oxide nanoparticles collide with, adsorb, and wrap the high-speed moving carbon black particles to form a composite;

[0018] Step four: quenching and collection: the same as the standard process, quenching water is injected at a set position, the quenching temperature is 650 DEG C, and the reaction is terminated; then the zinc / carbon black composite or aluminum / carbon black composite is collected through a cyclone separator and a bag filter;

[0019] 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 an inert atmosphere to remove residual solvents 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 according to a weight ratio of 0-100:100-0 to obtain modified carbon black.

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

[0021] Preferably, 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 with a volume ratio of 7:3; the stirring speed is increased to 1100 rpm and uniform stirring is continued for 25 minutes, the solvent addition amount is 12 parts by weight, and the stirring speed is 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 solutions, the application has the following beneficial effects:

[0024] The application adds zinc compound and aluminum compound in the process of preparing carbon black, and aluminum / carbon black composite and zinc / carbon black composite are prepared. Because metal ions are embedded in carbon black simultaneously when carbon black grows, the metal ions can be uniformly distributed in carbon black particles. Compared with other metal / carbon black composites prepared by surface adsorption, the application has stronger stability, dispersibility and other performances. Meanwhile, different effects of aluminum (hardness, wear resistance, corrosion resistance, etc.) and zinc (corrosion resistance, ultraviolet shielding, etc.) are used, and coating products with different performance requirements can be prepared by different content ratios of the two metal compounds, so as to meet the needs of users. DETAILED DESCRIPTION

[0025] The technical solutions of the application are further described below in combination with examples:

[0026] Example 1: Preparation of modified carbon black

[0027] Step one: carbon black generation: the same as the production of ordinary furnace carbon black, raw material oil (coal tar) and preheated oxygen-rich air are sprayed from the head of the reaction furnace, the air / oil ratio is 3.5 Nm 3 / kg oil, and incomplete combustion and thermal cracking occur at high temperature 1400-1600 ℃, the residence time is tens of milliseconds, and carbon black is generated;

[0028] 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 (Al (NO3) 3·9H2O) ethanol solution is uniformly and stably sprayed into the flue gas / carbon black gas flow 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;

[0029] 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;

[0030] Step four: quenching and collection: the same as the standard process, quenching water is sprayed at the set position, the quenching temperature is 650 ℃, and the reaction is terminated; then the zinc / carbon black composite or aluminum / carbon black composite is collected through a cyclone separator and a bag filter;

[0031] Step five: post-treatment: the collected zinc / carbon black composite or aluminum / carbon black composite is calcined at 500 ℃ under the protection of an inert atmosphere to remove residual solvents 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 and the aluminum / carbon black composite are prepared according to the weight ratio of 0-100:100-0.

[0032] Example 2 Preparation of coating 1

[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 complex and aluminum / carbon black complex weight ratio of 50:50) and 15 parts by weight of solvent (mixed solvent of dimethylbenzene:n-butanol volume ratio of 7:3), add them to the stirring tank, pre-disperse for 10 minutes at a speed of 2000 rpm;

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

[0035] c. Transfer the modified carbon black-epoxy resin mother liquor obtained in step b to the planetary mixer, add 10 parts by weight of mica powder and 15 parts by weight of barium sulfate successively under stirring at 500 rpm, increase the speed to 1000 rpm and continue stirring for 30 minutes until uniform; then reduce the speed to 400 rpm, slowly add 1.5 parts by weight of fumed silica, immediately disperse for 10 minutes at 1200 rpm after adding; then add 0.2 parts by weight of leveling agent, 0.3 parts by weight of defoaming agent and 10 parts by weight of solvent (mixed solvent of dimethylbenzene:n-butanol volume ratio of 7:3) successively, stir for 10 minutes at 800 rpm and mix thoroughly;

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

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

[0038] Example 3 Preparation of coating 2

[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 complex and aluminum / carbon black complex weight ratio of 50:50) and 10 parts by weight of solvent (same as in Example 2), add them to the stirring tank, pre-disperse for 10 minutes at a speed of 2000 rpm;

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

[0041] 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 1200 rpm and stirred for 20 minutes until uniform; then the stirring speed was reduced to 400 rpm, 1.5 parts by weight of fumed silica was slowly added, and immediately after adding, 1200 rpm was dispersed for 10 minutes; then 0.2 parts by weight of leveling agent, 0.3 parts by weight of defoaming agent and 15 parts by weight of solvent (same as Example 2) were added in turn, stirred at 800 rpm for 15 minutes, and fully mixed;

[0042] d. The slurry obtained in step c was transferred to a vacuum degassing machine, 50 rpm, vacuum to -0.095 MPa, maintained for 30 minutes until no bubbles overflowed, to obtain the A component coating;

[0043] e. At the same time of preparing the A component coating, the B component coating was prepared, 59 parts by weight of polyamide was diluted with 5 parts by weight of the solvent used for preparing the A component coating to obtain the B component coating (the weight ratio of the A component coating to the B component coating was about 100:40 when used); thus the coating prepared by the modified carbon black was obtained.

[0044] Example 4 Preparation of the coating three

[0045] a. 100 parts by weight of epoxy resin, 1.0 parts by weight of dispersant, 6 parts by weight of modified carbon black (the weight ratio of zinc / carbon black composite to aluminum / carbon black composite was 50:50) and 12 parts by weight of solvent (same as Example 2) were accurately weighed and added to a stirring tank, and pre-dispersed at a stirring speed of 2000 rpm for 10 minutes;

[0046] b. The pre-dispersed slurry was transferred to a sand mill, grinding media was added, and 1800 rpm was used for grinding for 2.5 hours to obtain a modified carbon black-epoxy resin mother liquor;

[0047] 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 1200 rpm and stirred for 20 minutes until uniform; then the stirring speed was reduced to 400 rpm, 1.5 parts by weight of fumed silica was slowly added, and immediately after adding, 1200 rpm was dispersed for 10 minutes; then 0.2 parts by weight of leveling agent, 0.3 parts by weight of defoaming agent and 15 parts by weight of solvent (same as Example 2) were added in turn, stirred at 800 rpm for 15 minutes, and fully mixed;

[0048] d. The slurry obtained in step c was transferred to a vacuum degassing machine, 50 rpm, vacuum to -0.095 MPa, maintained for 30 minutes until no bubbles overflowed, to obtain the A component coating;

[0049] e. At the same time of preparing the A component coating, the B component coating is prepared by diluting 57 parts by weight of the polyamide with 5 parts by weight of the solvent of the A component coating (the weight ratio of the A component coating and the B component coating is about 100:40 when used); the modified carbon black prepared coating is obtained.

[0050] Example 5 Preparation of the coating five

[0051] The modified carbon black in Example 4 is replaced by using zinc / carbon black composite entirely, and other conditions are unchanged.

[0052] Example 6 Preparation of the coating six

[0053] The modified carbon black in Example 4 is replaced by using aluminum / carbon black composite entirely, and other conditions are unchanged.

[0054] Example 7 Preparation of the coating seven

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

[0056] Example 8 Preparation of the coating eight

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

[0058] Comparative Example 1

[0059] The modified carbon black in Example 4 is replaced by the ordinary carbon black prepared without spraying the metal precursor (metal aluminum or metal zinc) in the preparation process of the carbon black in Example 1, and other conditions are unchanged.

[0060] Product testing results and analysis:

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

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

[0063]

[0064] From the results of Table 1, it can be seen that after the modified carbon black replaces the ordinary carbon black, the corrosion resistance of the paint is significantly improved, among which the result of Example 5 using zinc / carbon black composite is the best; from the electrochemical impedance spectrum data, it can be seen that the use of modified carbon black has better shielding effect, among which the higher the content of zinc / carbon black composite, the better the shielding effect; the results of ultraviolet aging test also show that the modified carbon black has better anti-aging effect, among which the higher the content of zinc / carbon black composite, the better the anti-aging effect; from the test results of surface resistivity and volume resistivity, it can be seen that the use of modified carbon black loses the conductivity and has good insulation performance; from the results of pencil hardness test and wear resistance, it can be seen that the use of modified carbon black improves the hardness and wear resistance of the paint, and with the increase of the content of aluminum / carbon black composite, the hardness and wear resistance of the paint also increase accordingly.

[0065] Therefore, through the above tests, according to the different requirements of users for the performance of the paint, by adjusting the weight ratio of zinc / carbon black composite and aluminum / carbon black composite in the modified carbon black, the paint products with corresponding functional requirements can be prepared.

[0066] It should be understood that the above examples are only used to illustrate the present application and not to limit the scope of the present application. Furthermore, it should be understood that after reading the content of the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

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 added to the stirring tank, pre-dispersed at 2000 rpm for 10 minutes; b. the pre-dispersed slurry was transferred to a sand mill, and grinding medium 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 immediately dispersed at 1200 rpm for 10 minutes after adding; 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, maintain for 20-30 minutes until no bubbles overflow, 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 was obtained. The modified carbon black is an aluminum / carbon black composite and a zinc / carbon black composite prepared by adding metal aluminum compound and metal 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 epoxy resin in step a is epoxy resin E-51, the dispersant is dispersant BYK-163, and the solvent is a mixed solvent with a volume ratio of dimethylbenzene to n-butanol 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. The preparation method of the modified carbon black in step a is: 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 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 ℃, a prepared 0.5 mol / L zinc acetate aqueous solution or a 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 the carbon black; ​ ​ 2. The paint prepared using modified carbon black according to claim 1, characterized by: ​ 3. The paint prepared using modified carbon black according to claim 1, characterized by: ​ ​ ​ Step three: reaction and complexation: the atomized droplets rapidly evaporate at high temperature, decompose, and the generated oxide nanoparticles collide with, adsorb, and wrap the high-speed moving carbon black particles to form a complex; Step four: quenching and collection: the same as the standard process, quenching water is sprayed at a set position to terminate the reaction at a quenching temperature of 650 ℃; then a zinc / carbon black complex or an aluminum / carbon black complex is collected through a cyclone separator and a bag filter; Step five: post-treatment: the collected zinc / carbon black complex or aluminum / carbon black complex is calcined at 500 ℃ under the protection of an inert atmosphere to remove residual solvents and incomplete decomposition of the precursor, and a stable zinc / carbon black complex or aluminum / carbon black complex is obtained; the zinc / carbon black complex or aluminum / carbon black complex is prepared into modified carbon black at a weight ratio of 0-100:100-0.

4. 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 beads with a diameter of 0.6-0.8 mm, and the filling amount is 60-70%; the material temperature is controlled to be lower than 50 ℃ during grinding, the grinding speed is 1800 rpm, and the grinding time is 2.5 hours.

5. 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 uniform stirring is continued for 25 minutes; the solvent is added at an amount of 12 parts by weight, and stirring is performed at 800 rpm for 13 minutes.

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

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