| 配方类型： |
EMULSIONS AND DISPERSIONS |
| 配方说明： |
Soft Asphalt Emulsion |
| 配方组成： |
"Carbopol" 941/1.5 (0.19%)
Soft Asphalt/400
Sodium Hydroxide (10% sol'n)/4.0
Water/400
"Ethomeen" C-25/0.75 |
| 配制方法： |
Carefully disperse the Carbopol 941 in the water. After thorough dispersion, neutralize with the sodium hydroxide followed by the Ethomeen C-25. Heat this mucilage to 65-70'C. (The water can be heated prior to Carbopol 941 and neutralizer addition as this will assist dispersion of the Carbopol 941). Separately heat the asphalt to 85'C.
Utilizing moderately high shear mixing, slowly add the molten asphalt to the water mucilage. Add the asphalt no faster than the rate of dispersion. If the asphalt is added too rapidly, the emulsion will invert and separate.
When the asphalt has been added, continue mixing for a short time to ensure uniformity. Shock cool the emulsion without mixing and allow it to remain undisturbed until its temperature falls to 30-35'C.
An emulsion prepared in the foregoing manner had a final pH of 6.5 and a viscosity of 5500 cps (Brookfield, 20 rpm). It was stable on aging and very smooth in appearance. |
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