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Rubber asphalt mixture with high-temperature storage stability and preparation method thereof
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A rubber asphalt and high-temperature storage technology, which is applied to building structures, building insulation materials, building components, etc., can solve problems such as insufficient storage performance
Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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Therefore, it is far from enough to only examine the storage performance of rubber asphalt at 163 °C
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Embodiment 1
[0033] Rubber asphalt composition proportioning of the present invention is as follows:
[0038] (1) Heat Zhenhai base asphalt with a penetration (25°C) of No. 110 to 180°C-190°C, add 40-mesh waste tire rubber powder, stir for 10 minutes, and then perform high-shear grinding for 2 to 3 times before placing Stir in the development tank for 1h;
[0039] (2) Add 1% slow-release chemical modifier (benzoyl peroxide), stir evenly, and then inject compressed air from the bottom of the tank. Air volume is 0.2m 3 × kg -1 × h -1 . Continue to stir for 1 hour, and the properties of rubber asphalt are shown in Table 1.
Embodiment 2
[0058] 60 mesh rubber powder 15%
[0059] Base bitumen 84%
[0060] Slow-release chemical modifier (benzoyl peroxide) 1%
[0061] The preparation process is as follows
[0062] (1) Heat Zhenhai base asphalt with a penetration (25°C) of No. 110 to 180°C-190°C, add 60 mesh waste tire rubber powder and stir for 15 minutes, then undergo high-shear grinding for 2 to 3 times before developing Stir in the tank for 1.5h,
[0063] (2) Add 1% slow-release chemical modifier (benzoyl peroxide), stir evenly, and then inject compressed air from the bottom of the tank. Air volume is 0.4m 3 × kg -1 × h -1 . Continue to stir for 1 hour, and the properties of rubber asphalt are shown in Table 1.
[0069] (1) Heat the Zhenhai base asphalt with a penetration (25°C) of No. 110 to 180°C-190°C, add 40 mesh waste tire rubber powder and stir for 10 minutes, and then undergo high-shear grinding for 2 to 3 times before developing Stir in the tank for 1.5h,
[0070] (2) Add 1% slow-release chemical modifier (azobisisobutyronitrile), stir evenly, and then pass compressed air from the bottom of the tank. The air volume is 0.4m 3 × kg -1 × h -1 . Continue to stir for 1 hour, and the properties of rubber asphalt are shown in Table 1.
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Abstract
The invention provides a rubber asphalt mixture with high-temperature storage stability and a preparation method thereof. 0.5-2% of azodiisobutyronitrile and / or a benzoyl peroxidechemical modifier is added into the rubber asphalt. The chemical modifier is a slow release type chemical modifier which is wrapped by a polymer, in order to realize slow release effect in the rubber asphalt. A special chemical modifier is added into the rubber asphalt mixture, so that the rubber powder can be fully swollen in asphalt, and the rubber powder is oxidized for better degradation. Stationary storage of the rubber asphalt can be carried out for 48 hours with a high temperature condition of 180 DEG C, obvious sedimentation of rubber powder does not happen, and the difference between upper and lower softening points in a separation test meets the index requirement of thermal storage stabilization technology of SBS modified asphalt in JTGF40-2004 technical standard.
Description
technical field [0001] The invention relates to a method for preparing modified asphalt, in particular to a method for preparing rubber asphalt with high-temperature storage stability by using waste tire rubber powder. Background technique [0002] Rubber asphalt has been paid more and more attention in recent years. On the one hand, as a way to rationally utilize waste rubber, it can relieve the pressure of waste tires on the environment; on the other hand, as an asphalt modifier, rubber powder has a wide source and low price. Resistant asphalt plays a significant role in improving asphalt's high temperature stability, low temperature crack resistance, aging resistance, fatigue resistance, and prolonging its service life. [0003] Although rubber powder can improve some properties of asphalt to a certain extent, since waste tire rubber powder belongs to vulcanized rubber powder, its surface is inert and has poor compatibility with asphalt. In addition, the density of rubbe...
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