A dry asphalt pigment and its production process

Abstract

The present invention belongs to the field of pigments and their production technology, and provides a dry asphalt pigment and its production process. The raw materials include a bulk material, titanium dioxide, an auxiliary agent and a colorant. The bulk material includes talcum powder, which can effectively increase the fluidity of other raw materials during stirring, mixing and ball milling and kneading, so that the raw materials are mixed more fully. The wetting agent, dispersant and emulsifier in the auxiliary agent can be used to coat the particles of each raw material during the ball milling process, improve the dispersibility between inorganic raw materials and organic raw materials, and thus enhance the weather resistance, color and tinting power of the pigment. In the production process, a two-step mixing step of premixing with a double-shaft cone mixer and ball milling and kneading is used to increase the uniformity of mixing between the raw materials. The modification with the auxiliary agent can solve the dispersibility problem between the inorganic raw materials and the organic raw materials, and can further reduce the particle size of the pigment. The particle size of the obtained finished product is above 800 mesh, and it has good hydrophilicity, dispersibility, weather resistance, color and tinting power.

Description

Technical Field

[0001] The invention belongs to the technical field of pigments and their production, and in particular relates to a dry asphalt pigment and its production process. Background Art

[0002] Pigments refer to substances that can dye objects with color. There are soluble pigments and insoluble pigments, inorganic pigments and organic pigments. Inorganic pigments are generally mineral substances, and organic pigments are generally taken from plants and marine animals, such as madder indigo, gamboge, and purple extracted from shellfish.

[0003] Asphalt pigment is used to color asphalt roads. Existing asphalt pigments are mostly produced using two processes: wet and dry processes. The wet process involves dispersing the raw material powder in a solvent such as ethanol and producing it through repeated rinsing, filtering, and drying steps. The overall process is time-consuming and requires a large amount of solvent, resulting in high production costs. The dry process involves directly mechanically mixing the raw material powder through a high-speed blender. However, the pigment produced by the mixing process has a large particle size, and its dispersibility and weather resistance are poor in actual use, which affects the coloring effect. Summary of the Invention

[0004] The present invention provides a dry-process asphalt pigment and a production process thereof, aiming to solve the above-mentioned technical problems.

[0005] The present invention is achieved as follows: a dry asphalt pigment and its production process are made by dry compounding, and include the following raw materials by weight percentage: 66-69% of bulk material, 14-21% of titanium dioxide, 2-3% of additives, and 8-17% of colorant. The bulk material includes calcium carbonate and talc powder, and the additives include a wetting agent, a dispersant, and an emulsifier.

[0006] Furthermore, the weight ratio of the calcium carbonate to the talc is 2:1, the wetting agent is one of fatty alcohol polyoxyethylene ether, coconut oil diethanolamide, octylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, and alkylphenol polyoxyethylene ester, the dispersant is trimethylolpropane, and the emulsifier is dodecylphenol polyoxyethylene ether or nonylphenol polyoxyethylene ether. The weight ratio of the wetting agent, dispersant, and emulsifier is 1:1:1.

[0007] Furthermore, the colorant is one or a combination of phthalocyanine blue, phthalocyanine green, iron yellow, brown chrome yellow, lemon yellow, and iron oxide black.

[0008] Furthermore, the following raw materials are included by weight percentage: 69% of bulk material, 17% of titanium dioxide, 2% of auxiliary agent, and 12% of phthalocyanine blue.

[0009] Furthermore, the following raw materials are included by weight percentage: 66% of bulk material, 14% of titanium dioxide, 3% of auxiliary agent, and 17% of phthalocyanine green.

[0010] Furthermore, the following raw materials are included by weight percentage: 66% of bulk material, 14% of titanium dioxide, 3% of auxiliary agent, 15% of phthalocyanine green, and 2% of iron yellow.

[0011] Furthermore, the following raw materials are included by weight percentage: 66% of bulk material, 14% of titanium dioxide, 3% of additives, 15% of phthalocyanine green, 1% of brown chrome yellow, and 1% of lemon yellow.

[0012] Furthermore, the following raw materials are included by weight percentage: 69% of bulk material, 17% of titanium dioxide, 2% of auxiliary agent, and 12% of black iron oxide.

[0013] Furthermore, the following raw materials are included by weight percentage: 69% of bulk material, 21% of titanium dioxide, 2% of auxiliary agent, and 8% of black iron oxide.

[0014] The present invention also provides a production process of dry asphalt pigment, comprising the following steps:

[0015] Weigh each raw material according to weight percentage;

[0016] Put all raw materials except the additives into a double-shaft cone mixer and mix for 3 to 5 minutes to obtain a premix;

[0017] The premix is ​​put into a ball mill and kneaded for 5 to 7 hours, with the temperature controlled at 55 to 60°C and the pressure lower than 1.5 atmospheres to obtain raw powder;

[0018] Adding additives to the raw powder mixture and continuing to knead in a ball mill for 2 to 3 hours, controlling the temperature at 55 to 60°C and the pressure below 1.5 atmospheres to obtain cooked powder;

[0019] The mixed powder is screened through a vibrating screen and then put into a grinder for grinding to obtain dry asphalt pigment.

[0020] Beneficial effects

[0021] In the dry asphalt pigment and its production process provided by the present invention, the body material in the pigment includes talcum powder, which can effectively increase the fluidity of other raw materials during stirring and mixing and ball milling and kneading, so that the raw materials are mixed more fully. The wetting agent, dispersant and emulsifier in the auxiliary agent can peritoneum the particles of each raw material during the ball milling process, improve the dispersibility between inorganic raw materials and organic raw materials, thereby improving the weather resistance, color and tinting power of the pigment. In the production process, a two-step mixing step of premixing with a double-shaft cone mixer and ball milling and kneading is used to increase the uniformity of mixing between the raw materials. The modification with auxiliary agents can solve the dispersibility problem between inorganic raw materials and organic raw materials, and can further reduce the particle size of the pigment. The particle size of the obtained finished product is above 800 mesh, and it has good hydrophilicity, dispersibility, weather resistance, color and tinting power. DETAILED DESCRIPTION

[0022] The raw materials of the dry asphalt pigment provided by the present invention include bulk material, titanium dioxide, additives and colorant. The bulk material includes calcium carbonate and talc, which are the base materials. The talc is used to improve the fluidity of the system during the ball milling process and improve the mixing effect of the raw materials. The additives include a wetting agent, a dispersant and an emulsifier. The wetting agent is one of fatty alcohol polyoxyethylene ether, coconut oil diethanolamide, octylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, and alkylphenol polyoxyethylene ester. The dispersant is trimethylolpropane. The wetting agent and dispersant are coated on the particle surface of calcium carbonate, talc, titanium dioxide and colorant, which can improve the degree of mechanical mixing between the raw materials, make the raw materials more uniform, and avoid agglomeration. The emulsifier is dodecylphenol polyoxyethylene ether or nonylphenol polyoxyethylene ether, which can improve the dispersion effect between the inorganic raw materials and the organic raw materials, so that they are kneaded into multiple wholes with smaller particle sizes during the ball milling process, which is conducive to improving color uniformity. The wetting agents, dispersants and emulsifiers in the additives work together to improve the dispersion and weather resistance of pigments, thereby improving color, brightness and tinting strength.

[0023] The present invention provides asphalt pigments in six colors, wherein the colorant of the blue asphalt pigment is phthalocyanine blue, the colorant of the green asphalt pigment is phthalocyanine green, the colorant of the yellow-green asphalt pigment is a combination of phthalocyanine green and iron yellow, the colorant of the dark green asphalt pigment is a combination of phthalocyanine green, brown chrome yellow and lemon yellow, and the colorant of the medium gray and light gray asphalt pigments is iron oxide black, and the color depth is adjusted according to different proportions.

[0024] The present invention also provides a production process for the above-mentioned dry asphalt pigment, comprising weighing raw materials according to weight percentage, putting all raw materials except the additives into a double-shaft cone mixer for mixing to obtain a premix, putting the premix into a ball mill for kneading to obtain a raw mixed powder, adding additives to the raw mixed powder and continuing to knead in the ball mill to obtain a cooked mixed powder, screening the cooked mixed powder through a vibrating screen and then putting it into a grinder for crushing to obtain a dry asphalt pigment.

[0025] Each powder raw material is first pre-mixed in a double-shaft cone mixer, the rotational speed of the double-shaft cone mixer is 26-30r / min, and the rotational speed is 2.5r / min. The particle size of the mixed raw materials is substantially unchanged from the initial particle size. Generally, the particle size of the initial raw materials is 315-325 mesh. It can be predicted that the smaller the particle size of the powder raw materials, the higher the density of the mutual mixing of the raw materials, the tighter the fit between the raw material particles, the stronger the integrity of the finished pigment, the pigment is not easy to delaminate, and can be closely combined with the colored object during coloring, thereby improving dispersibility and tinting power. Therefore, after pre-mixing, the present invention utilizes a ball mill to further process the premix, reducing the particle size of the mixed raw materials to more than 800 mesh, and adding an auxiliary agent during the process, so that the particle size of the raw materials can be reduced and the auxiliary agent can be used to uniformly coat the surface of the raw material particles, thereby improving the weather resistance and color of the pigment.

[0026] In addition, the production process of the dry asphalt pigment of the present invention further includes the steps of variable speed ball milling and kneading in the process of adding the premix into the ball mill and kneading for 5 to 7 hours and adding the additive to the raw powder of the mixture and continuing to knead in the ball mill for 2 to 3 hours. Taking the ball milling for 7 hours before adding the additive and the ball milling for 3 hours after adding the additive as an example, the speed is controlled at 10 to 15 r / min in the first 0.5 hour so that the premix is ​​fully filled into the grinding medium; the speed is controlled at 15 to 20 r / min in the 0.5 to 2 hours. , to reduce the particle size of the mixed raw materials; control the speed to 20-23r / min within 2-4h to further reduce the particle size of the mixed raw materials; control the speed to 25-26r / min within 4-7h to reduce the particle size of the mixed raw materials again, stop the machine after the time is reached, add additives, control the speed to 10r / min for the first 0.5h to allow the additives to fill the grinding medium, and control the speed to 26-28r / min for 0.5-3h to fully mix the raw powder and additives.

[0027] The obtained mixed powder is crushed to obtain dry asphalt pigment. If there are multiple ball mills for production, the dry asphalt pigments produced by multiple ball mills need to be mixed and crushed again to make the color of the same batch of products uniform.

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The raw materials of the dry asphalt pigment provided by the present invention include body material, titanium dioxide, additives and colorant.

[0030] Example 1

[0031] The embodiment of the present invention provides a dry-process asphalt pigment, which is blue in color and includes the following raw materials:

[0032] 460kg calcium carbonate, 230kg talc, 170kg titanium dioxide, 20kg additives, 120kg phthalocyanine blue. The additives are composed of wetting agent, trimethylolpropane and dodecylphenol polyoxyethylene ether in a weight ratio of 1:1:1. The particle size of calcium carbonate, talc, titanium dioxide and phthalocyanine blue is 325 mesh.

[0033] The preparation process of the dry asphalt pigment comprises the following steps:

[0034] Calcium carbonate, talc, titanium dioxide, phthalocyanine blue and additives were weighed separately, and calcium carbonate, talc, titanium dioxide and phthalocyanine blue were put into a double-shaft cone mixer and mixed for 5 minutes to obtain a premix. The premix was put into a ball mill and kneaded for 7 hours. During this period, the speed was controlled at 10r / min in the first 0.5h, 15r / min in 0.5-2h, 20r / min in 2-4h, and 25r / min in 4-7h. The temperature was controlled at 55-60°C. The pressure is lower than 1.5 atmospheres. The machine is stopped after the time is reached to obtain mixed raw powder. Additives are added to the mixed raw powder and continue to knead in the ball mill for 3 hours. During this period, the speed is controlled at 10r / min for the first 0.5h, and the speed is controlled at 26r / min for 0.5-3h. The temperature is controlled at 55-60℃, and the pressure is lower than 1.5 atmospheres. The machine is stopped after the time is reached to obtain mixed cooked powder. The mixed cooked powder is screened through a vibrating screen and then put into a grinder for crushing to obtain dry asphalt pigment with a particle size greater than 800 mesh.

[0035] Example 2

[0036] The embodiment of the present invention provides a dry-process asphalt pigment, which is green in color and includes the following raw materials:

[0037] 440kg calcium carbonate, 220kg talc, 140kg titanium dioxide, 30kg additives, 170kg phthalocyanine green. The additives are composed of wetting agent, trimethylolpropane and dodecylphenol polyoxyethylene ether in a weight ratio of 1:1:1. The particle size of calcium carbonate, talc, titanium dioxide and phthalocyanine green is 325 mesh.

[0038] The preparation process of the dry asphalt pigment comprises the following steps:

[0039] Calcium carbonate, talc, titanium dioxide, phthalocyanine green and additives were weighed separately, and calcium carbonate, talc, titanium dioxide and phthalocyanine green blue were put into a double-shaft cone mixer and mixed for 3 minutes to obtain a premix. The premix was put into a ball mill and kneaded for 7 hours. During this period, the speed was controlled at 12r / min in the first 0.5h, 17r / min in 0.5-2h, 22r / min in 2-4h, and 26r / min in 4-7h. The temperature was controlled at 55-60℃. , the pressure is lower than 1.5 atmospheres, and the machine is stopped after the time is reached to obtain mixed raw powder. Add additives to the mixed raw powder and continue to knead in the ball mill for 2 hours. During this period, the speed is controlled at 10r / min for the first 0.5h, and the speed is controlled at 27r / min for 0.5-2h. The temperature is controlled at 55-60℃, and the pressure is lower than 1.5 atmospheres. The machine is stopped after the time is reached to obtain mixed cooked powder. The mixed cooked powder is screened through a vibrating screen and then put into a grinder for crushing to obtain dry asphalt pigment with a particle size greater than 800 mesh.

[0040] Example 3

[0041] The embodiment of the present invention provides a dry-process asphalt pigment having a yellow-green color, comprising the following raw materials:

[0042] 440kg of calcium carbonate, 220kg of talc, 140kg of titanium dioxide, 30kg of additives, 150kg of phthalocyanine green, and 20kg of iron yellow. The additives are composed of alkylphenol polyoxyethylene ester, trimethylolpropane, and dodecylphenol polyoxyethylene ether in a weight ratio of 1:1:1. The particle size of calcium carbonate, talc, titanium dioxide, phthalocyanine green, and iron yellow is 325 mesh.

[0043] The preparation process of the dry asphalt pigment comprises the following steps:

[0044] Calcium carbonate, talc, titanium dioxide, phthalocyanine green, iron yellow and additives were weighed respectively, and calcium carbonate, talc, titanium dioxide, phthalocyanine green and iron yellow were put into a double-shaft cone mixer and mixed for 5 minutes to obtain a premix. The premix was put into a ball mill and kneaded for 5 hours. During this period, the speed was controlled at 13r / min in the first 0.5h, 18r / min in 0.5-1h, 23r / min in 1-3h, 26r / min in 3-5h, and the temperature was controlled at 55-6 0℃, pressure lower than 1.5 atmospheres, stop the machine after the time is reached, get mixed raw powder, add additives to the mixed raw powder and continue to knead in the ball mill for 3 hours. During this period, the speed is controlled at 10r / min for the first 0.5h, and the speed is controlled at 28r / min for 0.5-3h. The temperature is controlled at 55-60℃, the pressure is lower than 1.5 atmospheres, stop the machine after the time is reached, get mixed cooked powder, screen the mixed cooked powder through a vibrating screen, and put it into a grinder for crushing to get dry asphalt pigment with a particle size greater than 800 mesh.

[0045] Example 4

[0046] The embodiment of the present invention provides a dry-process asphalt pigment having a dark green color, comprising the following raw materials:

[0047] 440kg of calcium carbonate, 220kg of talc, 140kg of titanium dioxide, 30kg of additives, 150kg of phthalocyanine green, 10kg of brown chrome yellow, and 10kg of lemon yellow. The additives are composed of fatty alcohol polyoxyethylene ether, trimethylolpropane, and nonylphenol polyoxyethylene ether in a weight ratio of 1:1:1. The particle size of calcium carbonate, talc, titanium dioxide, phthalocyanine green, brown chrome yellow, and lemon yellow is 325 mesh.

[0048] The preparation process of the dry asphalt pigment comprises the following steps:

[0049] Calcium carbonate, talc, titanium dioxide, phthalocyanine green, brown chrome yellow, lemon yellow and additives were weighed respectively, and calcium carbonate, talc, titanium dioxide, phthalocyanine green, brown chrome yellow and lemon yellow were put into a double-shaft cone mixer and mixed for 5 minutes to obtain a premix. The premix was put into a ball mill and kneaded for 7 hours. During this period, the speed was controlled at 10r / min in the first 0.5h, 15r / min in 0.5-2h, 20r / min in 2-4h, and 25r / min in 4-7h. The temperature was controlled. At 55-60°C and the pressure is lower than 1.5 atmospheres, the machine is stopped after the time is reached to obtain mixed raw powder, and additives are added to the mixed raw powder and continue to knead in the ball mill for 3 hours. During this period, the speed is controlled at 10r / min for the first 0.5h, and the speed is controlled at 26r / min for 0.5-3h. The temperature is controlled at 55-60°C and the pressure is lower than 1.5 atmospheres. The machine is stopped after the time is reached to obtain mixed cooked powder, and the mixed cooked powder is screened through a vibrating screen and then put into a grinder for crushing to obtain dry asphalt pigment with a particle size greater than 800 mesh.

[0050] Example 5

[0051] The embodiment of the present invention provides a dry-process asphalt pigment having a medium gray color, comprising the following raw materials:

[0052] 460kg of calcium carbonate, 230kg of talc, 170kg of titanium dioxide, 20kg of additives, and 120kg of black iron oxide. The additives are composed of coconut oil diethanolamide, trimethylolpropane, and nonylphenol polyoxyethylene ether in a weight ratio of 1:1:1. The particle size of calcium carbonate, talc, titanium dioxide, and black iron oxide is 325 mesh.

[0053] The preparation process of the dry asphalt pigment comprises the following steps:

[0054] Calcium carbonate, talc, titanium dioxide, black iron oxide and additives were weighed respectively, and calcium carbonate, talc, titanium dioxide and black iron oxide were put into a double-shaft cone mixer and mixed for 3 minutes to obtain a premix. The premix was put into a ball mill and kneaded for 7 hours. During this period, the speed was controlled at 14r / min in the first 0.5h, 17r / min in 0.5-2h, 21r / min in 2-4h, 25r / min in 4-7h, and the temperature was controlled at 55-6 0℃, pressure lower than 1.5 atmospheres, stop the machine after the time is up, get mixed raw powder, add additives to the mixed raw powder and continue to knead in the ball mill for 2h, control the speed to 10r / min for the first 0.5h, control the speed to 27r / min for 0.5-2h, control the temperature at 55-60℃, pressure lower than 1.5 atmospheres, stop the machine after the time is up, get mixed cooked powder, screen the mixed cooked powder through a vibrating screen and put it into a grinder for crushing to get dry asphalt pigment with a particle size greater than 800 mesh.

[0055] Example 6

[0056] The embodiment of the present invention provides a dry-process asphalt pigment having a light gray color, comprising the following raw materials:

[0057] 460kg of calcium carbonate, 230kg of talc, 210kg of titanium dioxide, 20kg of additives, and 80kg of black iron oxide. The additives are composed of octylphenol polyoxyethylene ether, trimethylolpropane, and nonylphenol polyoxyethylene ether in a weight ratio of 1:1:1. The particle size of calcium carbonate, talc, titanium dioxide, and black iron oxide is 325 mesh.

[0058] The preparation process of the dry asphalt pigment comprises the following steps:

[0059] Calcium carbonate, talc, titanium dioxide, black iron oxide and additives were weighed respectively, and calcium carbonate, talc, titanium dioxide and black iron oxide were put into a double-shaft cone mixer and mixed for 5 minutes to obtain a premix. The premix was put into a ball mill and kneaded for 6 hours. During this period, the speed was controlled at 15r / min in the first 0.5h, 19r / min in 0.5-2h, 23r / min in 2-4h, 26r / min in 4-6h, and the temperature was controlled at 55-6 0℃, pressure lower than 1.5 atmospheres, stop the machine after the time is up, get mixed raw powder, add additives to the mixed raw powder and continue to knead in the ball mill for 3h, control the speed at 10r / min for the first 0.5h, control the speed at 28r / min for 0.5-3h, control the temperature at 55-60℃, pressure lower than 1.5 atmospheres, stop the machine after the time is up, get mixed cooked powder, screen the mixed cooked powder through a vibrating screen and put it into a grinder for crushing to get dry asphalt pigment with a particle size greater than 800 mesh.

[0060] Tests have shown that the dry-process asphalt pigments prepared in Examples 1 to 6 can all be rapidly precipitated in clean water, and the upper water layer after precipitation is clear, demonstrating good hydrophilicity. The dry-process asphalt pigments prepared in Examples 1 to 6 are used for asphalt road coloring. After application, the road surface color is uniform and has a high color concentration, demonstrating good dispersibility, color, and tinting strength. Observation of the road surface color for six months revealed no significant change in the road surface color, and the color retention is high, demonstrating good weather resistance.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dry asphalt pigment, characterized in that: The invention comprises the following raw materials by weight percentage: 66% bulk material, 14% titanium dioxide, 3% additive, 15% phthalocyanine green, 1% brown chrome yellow, and 1% lemon yellow, wherein the bulk material comprises calcium carbonate and talc, the weight ratio of the calcium carbonate to the talc being 2:1, the additive comprises fatty alcohol polyoxyethylene ether, trimethylolpropane, and nonylphenol polyoxyethylene ether in a weight ratio of 1:1:1, and the particle size of the calcium carbonate, talc, titanium dioxide, phthalocyanine green, brown chrome yellow, and lemon yellow is 325 mesh; The production process of the dry asphalt pigment comprises the following steps: Calcium carbonate, talc, titanium dioxide, phthalocyanine green, brown chrome yellow, lemon yellow and additives were weighed separately, and the calcium carbonate, talc, titanium dioxide, phthalocyanine green, brown chrome yellow and lemon yellow were put into a double-shaft cone mixer and mixed for 5 minutes to obtain a premix; The premix is ​​put into a ball mill and kneaded for 7 hours. During this period, the speed is controlled at 10 r / min in the first 0.5 hour, 15 r / min in 0.5-2 hours, 20 r / min in 2-4 hours, and 25 r / min in 4-7 hours. The temperature is controlled at 55-60°C and the pressure is lower than 1.5 atmospheres. The machine is stopped after the time is reached to obtain mixed raw powder. Add the additives to the raw powder mixture and continue kneading in the ball mill for 3 hours. During this period, the speed is controlled at 10 r / min for the first 0.5 hour, and the speed is controlled at 26 r / min for 0.5 to 3 hours. The temperature is controlled at 55 to 60°C and the pressure is lower than 1.5 atmospheres. After the time is reached, the machine is stopped to obtain the cooked powder mixture. The mixed powder is screened through a vibrating screen and then put into a grinder for grinding to obtain dry asphalt pigment.