A kind of preparation method of calcium alginate pitch self-healing capsule with excellent thermal stability
A technology of asphalt self-healing and calcium alginate, which is applied in the field of materials to solve the problem of poor thermal stability, prevent the reduction of healing effect, and improve the strength
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Embodiment 1
[0042] Prepare calcium alginate-TAM intercalated montmorillonite composite wall material asphalt self-healing capsules and single wall material calcium alginate asphalt self-healing capsules according to the following steps:
[0043] S1, use tris(hydroxymethyl)aminomethane and organic montmorillonite to prepare tris(hydroxymethyl)aminomethane intercalated montmorillonite with layered structure;
[0044] Tris(hydroxymethylaminomethane) (TAM) and montmorillonite were mixed uniformly in a mass ratio of 2:1, heated to 180°C in a closed container, kept at 180°C, taken out and cooled after 1 hour.
[0045] The cooled product was ground with a high-energy ball mill at a ball-to-powder ratio of 4:1 and a grinding rate of 400 rpm for 80 minutes to obtain TAM intercalated montmorillonite with a few-layered layered structure. The thickness of the TAM intercalated organic montmorillonite is 0.9 nm and the interlayer spacing is 1.945 nm, so the thickness of the completely peeled montmorill...
Embodiment 2
[0062] The steps in this embodiment are basically the same as those in Embodiment 1, and the details are as follows:
[0063] S1. Mix tris(hydroxymethylaminomethane) (TAM) and montmorillonite uniformly in a mass ratio of 3:1, heat to 190°C in a closed container, keep at 190°C for 1.5 hours, take out and cool.
[0064] The cooled product was ground by a high-energy ball mill at a ball-to-powder ratio of 5:1 and a grinding rate of 500 rpm for 90 minutes to obtain TAM intercalated montmorillonite with a few-layered layered structure. In a specific embodiment, the number of layers of the few-layer layered structure is 2-4 layers.
[0065] S2, prepare two cups of 400ml industrial grade sodium alginate solution with a concentration of 3.0wt%, one cup is added with 12g of TAM intercalated montmorillonite, and the other cup is not added. Under the shearing machine, high-speed shearing was carried out for 15 minutes respectively, and the shear rate was 5000 rpm to obtain a mixed solut...
Embodiment 3
[0072] The steps in this embodiment are basically the same as those in Embodiment 1, and the details are as follows:
[0073] S1. Mix trimethylolaminomethane (TAM) and montmorillonite in a mass ratio of 2:1 uniformly, heat to 180°C in a closed container, keep at 180°C, take out and cool after 1 hour.
[0074] The cooled product was milled using a high-energy ball mill at a ball-to-powder ratio of 4:1 and a milling rate of 400 rpm for 70 minutes. Due to the shortened grinding time, the obtained TAM intercalated montmorillonite has a multi-layered structure; the thickness distribution measured by atomic force microscope is as follows: figure 2 As shown, 46.1% of the TAM-intercalated organic montmorillonite has a layered structure of 5 to 6 layers, and 49.24% of the TAM-intercalated organic montmorillonite has a layered structure of more than 7 layers. The number of layers of the layered structure is 5 or more.
[0075] S2, prepare two cups of 400ml industrial grade sodium alg...
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