A kind of chemically modified hard asphalt and its preparation method
A kind of hard asphalt, chemical modification technology, applied in the field of petroleum asphalt, can solve the problem of not taking into account the low temperature service performance of asphalt, high reaction temperature, long reaction time, etc., to achieve excellent flow resistance, good adhesion performance, excellent low temperature The effect of using performance
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Embodiment 1
[0022] Select asphalt with a needle penetration of 56 1 / 10mm and a softening point of 52.3°C as the base asphalt, heat it to 145°C until it melts and flows, take 100 parts of the base asphalt and send it into the reaction tank, and start the agitator to lower the temperature of the reaction tank Maintain at 155°C, add 0.8 parts of polyphosphoric acid into the reaction tank, react for 80 minutes at a stirring speed of 1000 rpm, then add 4 parts of mother liquor of extension agent, continue high-speed stirring for 60 minutes, and finally add 0.2 parts The N-tallow-1,3-propylene diamine was stirred and reacted for 15 minutes to obtain the chemically modified high-strength hard pitch of the present invention. The properties of the product are shown in Table 1.
Embodiment 2
[0024] Prepare chemically modified hard asphalt according to the process of Example 1, the difference is that the addition of polyphosphoric acid is 1.2 parts, the addition of extension agent is 5.0 parts, and the addition of N-tetradecyl-1,3 propylene diamine The amount added is 0.3 parts. The properties of its products are shown in Table 1.
Embodiment 3
[0026] Prepare chemically modified hard asphalt according to the process of Example 1, the difference is that the addition of polyphosphoric acid is 1.5 parts, the addition of extension agent is 6.0 parts, and the addition of N-tallow-1,3-propylenediamine 0.3 parts. The properties of its products are shown in Table 1.
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