Waste tire pyrolytic carbon black modified composite material and preparation method of water-based color paste thereof

Abstract

The invention relates to the technical field of waste tire recycling and reusing, and discloses a waste tire pyrolytic carbon black modified composite material which comprises the following components in parts by weight: 20-50 parts of pyrolytic carbon black, 1-2 parts of a coupling agent, 0.1-1 part of an antioxidant, 0.1-0.5 part of a defoaming agent, 5-10 parts of a dispersing agent, 0.1-0.5 part of a lubricating agent, 10-15 parts of deionized water, 3-5 parts of DMF and 20-50 parts of zirconium beads. The preparation method of the water-based color paste of the waste tire pyrolytic carbon black modified composite material comprises the following steps: preparing the water-based color paste; compared with the prior art, the method has the advantages that the method is obtained through pyrolysis of the waste tires, and the environment-friendly advantage of cyclic utilization is achieved. The coupling agent is used for modification, so that the dispersity of the carbon black in water is improved, and the blackness and tinting strength of the carbon black are improved. The carbon element can be effectively recycled, dependence on fossil fuel is reduced, and emission of carbon dioxide is reduced. The water-based paint has the advantages of safety, environmental friendliness and the like, and is widely applied to polyurethane (PU) and polyvinyl chloride (PVC).

Description

Technical Field

[0001] The invention relates to the technical field of waste tire recycling and reuse, and in particular to a method for preparing a waste tire pyrolysis carbon black modified composite material and a water-based color paste thereof. Background Art

[0002] Traditional methods for producing carbon black often require extracting carbon from fossil fuels like coal, a wasteful process that produces large amounts of carbon dioxide and other environmentally harmful emissions. Furthermore, scrap tires are made of resistant materials containing heavy metals like lead, cadmium, and chromium, which take nearly a century to decompose naturally. Open-air storage occupies significant land resources and hinders natural degradation. Landfilling can lead to heavy metal contamination of the soil and damage plant roots.

[0003] Here, in order to solve the above problems, we proposed a preparation method of waste tire pyrolysis carbon black modified composite material and its water-based color paste. Summary of the Invention

[0004] The present invention aims to overcome the aforementioned technical difficulties by providing a method for preparing a composite material derived from waste tire pyrolysis carbon black and its water-based color paste. The composite material is obtained through pyrolysis of waste tires, offering the environmentally friendly advantage of recycling. Modification with a coupling agent enhances the carbon black's dispersibility in water, improving its blackness and tinting strength.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A composite material modified from pyrolytic carbon black of waste tires comprises the following components in parts by weight: 20-50 parts of pyrolytic carbon black, 1-2 parts of a coupling agent, 0.1-1 part of an antioxidant, 0.1-0.5 parts of a defoaming agent, 5-10 parts of a dispersant, 0.1-0.5 parts of a lubricant, 10-15 parts of deionized water, 3-5 parts of DMF, and 20-50 parts of zirconium beads.

[0007] Furthermore, the coupling agent is one of tetra-n-propyl zirconate, isopropyl tris(dioctyl pyrophosphate acyloxy) titanate or tetraneoalkoxy bis(didecyl phosphite acyloxy) titanate.

[0008] Furthermore, the antioxidant is one or more of isothiazolinone, isooctyltriethoxysilane, and methylchloroisothiazolinone.

[0009] Furthermore, the defoaming agent is one of polymethylsiloxane, ethylene glycol siloxane and polydimethylsiloxane.

[0010] Furthermore, the dispersant is one of anionic polyacrylate, polyoxyethylene ether, and polyacrylic acid.

[0011] Furthermore, the lubricant is one of sodium stearate, calcium stearate, and pentaerythritol stearate.

[0012] The preparation method of the water-based color paste of the waste tire pyrolysis carbon black modified composite material comprises the following steps:

[0013] Step 1: Weigh a certain amount of waste tire pyrolysis carbon black, add it to deionized water, and perform ultrasonic treatment to obtain a carbon black suspension;

[0014] Step 2: adding a coupling agent to the carbon black suspension, and mixing under heating and stirring conditions to obtain modified carbon black;

[0015] Step 3: Mix antioxidant, defoaming agent, leveling agent, dispersant, stabilizer, deionized water, N,N-dimethylformamide (DMF) and modified carbon black, add zirconium beads to the mixture for ball milling, centrifuge the ball mill product for defoaming and filter out the zirconium beads to obtain a water-based carbon black slurry.

[0016] Furthermore, in step 1, the particle size of the pyrolyzed carbon black is 1000-1500 mesh, and the carbon black suspension is obtained by ultrasonication at 50 kHz for 30-50 min.

[0017] Furthermore, in step 2, the magnetic stirring rate is 200-300 r / min, the heating temperature is 50-70° C., and the holding time is 2-3 h.

[0018] Furthermore, in step 3, the particle size of the zirconium beads is 50-70 mesh, the ball milling time is 60-90 min, the centrifugal time is 10-20 min, and the rotation speed is 3000-5000 r / min.

[0019] Carbon black is a kind of amorphous carbon, a light, loose and extremely fine black powder with a very large surface area ranging from 10-3000m2 / g. It is a product obtained by incomplete combustion or thermal decomposition of carbon-containing substances under conditions of insufficient air.

[0020] The advantages of the present invention compared with the prior art are:

[0021] 1. This invention obtains carbon black through pyrolysis of waste tires, which has the environmental advantage of recycling. The carbon black is modified with a coupling agent to enhance its dispersibility in water, improving its blackness and tinting strength.

[0022] 2. The present invention can effectively recycle carbon elements, reduce dependence on fossil fuels, and reduce carbon dioxide emissions. Water-based coatings are safe and environmentally friendly and are widely used in polyurethane (PU) and polyvinyl chloride (PVC). They can be used to make artificial leather, car interiors, car topcoats, and flooring. Because the carbon black used in water-based coatings has a small particle size and high cohesive energy, it has the disadvantage of being easily agglomerated. This study proposes a method for modifying waste tire pyrolysis carbon black and preparing its water-based color paste. DETAILED DESCRIPTION

[0023] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more. In addition, the term "include" and any variations thereof are intended to cover non-exclusive inclusions.

[0024] The present invention will be further described in detail below with reference to the embodiments.

[0025] Example 1

[0026] The composite material modified by pyrolysis carbon black of waste tires has the following raw material ratio: 4kg of pyrolysis carbon black, 0.5kg of coupling agent, 0.1kg of antioxidant, 0.1kg of defoaming agent, 1kg of dispersant and 0.1kg of lubricant.

[0027] Tetra-n-propyl zirconate is used as a coupling agent, isooctyltriethoxysilane is selected as an antioxidant, polymethylsiloxane is selected as a defoaming agent, polyacrylic acid is selected as a dispersant, and sodium stearate is selected as a lubricant.

[0028] The method for preparing a water-based color paste of a composite material modified by pyrolysis carbon black of waste tires comprises the following steps:

[0029] Step 1: Weigh 1500 mesh waste tire pyrolysis carbon black, add it into deionized water, and perform ultrasonic treatment for 30 minutes to obtain a carbon black suspension with a mass fraction of 20%.

[0030] Step 2: Add a coupling agent to the carbon black suspension and stir at 225 rpm at 60°C for 3 hours. Wash, dry, and grind to obtain the modified carbon black. The coupling agent used should be 1% of the mass of the pyrolyzed carbon black in Step 1.

[0031] Step 3: Mix the antioxidant, defoamer, dispersant, lubricant, DMF, water, and modified carbon black and ball-mill at 3 Hz for 30 minutes twice. Then, defoam by centrifugation at 2000 rpm for 20 minutes. Filter the zirconium beads through an 80-mesh screen to obtain a modified waste tire pyrolysis carbon black slurry.

[0032] The present invention and its embodiments are described above, and such description is not restrictive. If a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, and designs an embodiment similar to the technical solution without creative design, it shall fall within the scope of protection of the present invention.

[0033] Example 2

[0034] The composite material modified by pyrolysis carbon black of waste tires, the raw material ratio of the composite material is as follows: 2kg of pyrolysis carbon black, 2kg of carbon black, 0.5kg of coupling agent, 0.1kg of antioxidant, 0.1kg of defoaming agent, 1kg of dispersant, and 0.1kg of lubricant.

[0035] Tetra-n-propyl zirconate is used as a coupling agent, isooctyltriethoxysilane is selected as an antioxidant, ethylene glycol siloxane is selected as a defoaming agent, polyacrylic acid is selected as a dispersant, and sodium stearate is selected as a lubricant.

[0036] The method for preparing a water-based color paste of a composite material modified by pyrolysis carbon black of waste tires comprises the following steps:

[0037] Step 1: Weigh 1500-mesh waste tire pyrolysis carbon black and 1000-mesh commercial carbon black, add them into deionized water, and perform ultrasonic treatment for 30 minutes to obtain a carbon black suspension with a mass fraction of 20%.

[0038] Step 2: Add a coupling agent to the carbon black suspension and stir at 225 rpm at 60°C for 3 hours. Wash, dry, and grind to obtain the modified carbon black. The coupling agent used should be 1% of the mass of the pyrolyzed carbon black in Step 1.

[0039] Step 3: Mix the antioxidant, defoamer, dispersant, lubricant, DMF, water, and modified carbon black and ball-mill at 3 Hz for 30 minutes twice. Then, defoam by centrifugation at 2000 rpm for 20 minutes. Filter the zirconium beads through an 80-mesh screen to obtain a modified waste tire pyrolysis carbon black slurry.

[0040] Example 3

[0041] The composite material modified by pyrolysis carbon black of waste tires has the following raw material ratio: 4kg of pyrolysis carbon black, 0.5kg of coupling agent, 0.1kg of antioxidant, 0.1kg of defoaming agent, 1kg of dispersant and 0.1kg of lubricant.

[0042] Isopropyl tris(dioctyl pyrophosphate) titanate is used as a coupling agent, methylchloroisothiazolinone is selected as an antioxidant, ethylene glycol siloxane is selected as a defoaming agent, polyoxyethylene ether is selected as a dispersant, and pentaerythritol stearate is selected as a lubricant.

[0043] The method for preparing a water-based color paste of a composite material modified by pyrolysis carbon black of waste tires comprises the following steps:

[0044] Step 1: Weigh 1500 mesh waste tire pyrolysis carbon black, add it into deionized water, and perform ultrasonic treatment for 30 minutes to obtain a carbon black suspension with a mass fraction of 20%.

[0045] Step 2: Add a coupling agent to the carbon black suspension and stir at 225 rpm at 60°C for 3 hours. Wash, dry, and grind to obtain the modified carbon black. The coupling agent used should be 1% of the mass of the pyrolyzed carbon black in Step 1.

[0046] Step 3: Mix the antioxidant, defoamer, dispersant, lubricant, DMF, water, and modified carbon black and ball-mill at 3 Hz for 30 minutes twice. Then, defoam by centrifugation at 2000 rpm for 20 minutes. Filter the zirconium beads through an 80-mesh screen to obtain a modified waste tire pyrolysis carbon black slurry.

[0047] Performance testing method:

[0048] Stability test: 100 ml of each aqueous carbon black slurry prepared in Examples 1, 2, and 3 was taken and placed in a graduated cylinder. The mixture was allowed to stand for 1 day, 7 days, 14 days, 21 days, and 30 days, respectively. The sedimentation ratio was obtained by comparing the ratio of the upper color slurry to the overall color slurry. The larger the sedimentation ratio, the better the stability of the color slurry. The specific test results are shown in Table 1.

[0049] Blackness and tinting strength testing: 10 ml of each water-based carbon black slurry prepared in Examples 1, 2, and 3 was added to 1000 ml of water. A portion of the solution was placed in a visible light absorptiometry spectrometer to measure absorbance at 550 nm. For the tinting strength test, the water-based carbon black slurries prepared in Examples 1, 2, and 3 were mixed with titanium dioxide mother liquor to obtain a mixed color paste, and the above procedure was repeated. The test results are shown in Table 2.

[0050] Table 1 Stability of pyrolytic carbon black pulp

[0051]

[0052] Table 2 Comparison of color paste blackness and tinting strength

[0053] performance Blackness (A) Tinting strength (A) Example 1 3.7 2.8 Example 2 3.6 2.8 Example 3 3.5 2.7 Raw carbon black 3.8 2.8

[0054] Comparisons of Examples 1, 2, and 3 reveal that the water-based carbon black slurry of the composite material modified with waste tire pyrolytic carbon black exhibits superior stability compared to raw carbon black, enabling long-term storage and maintaining comparable jetness and tinting strength. Comparisons of Examples 1, 2, and 3 also reveal that mixing the composite material modified with waste tire pyrolytic carbon black improves stability but reduces jetness and tinting strength. This is because the added carbon black fails to disperse well in water with the composite material. Adding different additives can also affect performance.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

[0056] The above description of the present invention and its embodiments is non-limiting, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above description and, without departing from the purpose of the present invention, designs a structure and embodiment similar to the technical solution without creatively designing, they shall fall within the scope of protection of the present invention.

Claims

1. A composite material modified from waste tire pyrolysis carbon black, characterized in that: The composite material comprises the following components in parts by weight: 20-50 parts of pyrolysis carbon black, 1-2 parts of coupling agent, 0.1-1 part of antioxidant, 0.1-0.5 part of defoaming agent, 5-10 parts of dispersant, 0.1-0.5 part of lubricant, 10-15 parts of deionized water, 3-5 parts of DMF, and 20-50 parts of zirconium beads.

2. The composite material modified from waste tire pyrolysis carbon black according to claim 1, characterized in that: The coupling agent is one of tetra-n-propyl zirconate, isopropyl trititanate or tetraneoalkoxy bistitanate.

3. The composite material modified from waste tire pyrolysis carbon black according to claim 1, characterized in that: The antioxidant is one or more of isothiazolinone, isooctyltriethoxysilane, and methylchloroisothiazolinone.

4. The composite material modified from waste tire pyrolysis carbon black according to claim 1, characterized in that: The defoaming agent is one of polymethylsiloxane, ethylene glycol siloxane and polydimethylsiloxane.

5. The composite material modified from waste tire pyrolysis carbon black according to claim 1, characterized in that: The dispersant is one of anionic polyacrylate, polyoxyethylene ether and polyacrylic acid.

6. The composite material modified from waste tire pyrolysis carbon black according to claim 1, characterized in that: The lubricant is one of sodium stearate, calcium stearate, and pentaerythritol stearate.

7. A method for preparing a water-based color paste of a composite material modified by pyrolytic carbon black from waste tires according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: Step 1: Weigh a certain amount of waste tire pyrolysis carbon black, add it to deionized water, and perform ultrasonic treatment to obtain a carbon black suspension; Step 2: adding a coupling agent to the carbon black suspension, and mixing under heating and stirring conditions to obtain modified carbon black; Step 3: Mix antioxidant, defoamer, leveling agent, dispersant, stabilizer, deionized water, DMF and modified carbon black, add zirconium beads to the mixture for ball milling, centrifuge the ball mill product for defoaming and filter out the zirconium beads to obtain a water-based carbon black slurry.

8. The method for preparing the water-based color paste of the composite material modified by waste tire pyrolysis carbon black according to claim 7, characterized in that: In step 1, the particle size of the pyrolyzed carbon black is 1000-1500 mesh, and the carbon black suspension is obtained by ultrasonication at 50 kHz for 30-50 minutes.

9. The method for preparing the water-based color paste of the composite material modified by pyrolytic carbon black from waste tires according to claim 7, characterized in that: In step 2, the magnetic stirring rate is 200-300 r / min, the heating temperature is 50-70° C., and the holding time is 2-3 h.

10. The method for preparing the water-based color paste of the composite material modified by waste tire pyrolysis carbon black according to claim 7, characterized in that: In step 3, the particle size of the zirconium beads is 50-70 mesh, the ball milling time is 60-90 min, the centrifugal time is 10-20 min, and the rotation speed is 3000-5000 r / min.

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