Rubber and plastic alloy modified asphalt and asphalt mixture

Abstract

The invention relates to the field of asphalt. A rubber alloy modifier is obtained with untreated waste plastics and waste tire rubber powder as main raw materials. Modified asphalt which does not affect the rubber/plastic independent modification effects and has good asphalt storage stability and simple production process is finally obtained by utilizing the modifier to modify asphalt. The modified asphalt can be applied to continuous dense gradation of an asphalt mixture. On the premise that the high-and-low temperature performance of the mixture meets the requirement, the water stability is obviously improved, thus achieving effective treatment of two types of polymer waste pollutants such as waste tire rubber powder and waste plastics and change of asphalt properties.

Description

technical field [0001] The invention relates to the field of asphalt processing, in particular to a rubber-plastic alloy modified asphalt. Background technique [0002] In recent years, the environmental pollution caused by the accumulation of waste tires and waste plastics has attracted widespread attention. Waste rubber is the second largest waste polymer material. The world produces about 31 million tons of rubber products every year, 50% of which are tires, and the scrap rate of tires is as high as 55.4%. According to statistics, there are 1.5 billion tires (9 million tons) discarded every year in the world. Driven by the continuous increase in the number of private cars and trucks in my country, the output of waste tires has increased dramatically year by year. According to statistics, in 2006, my country's tire output was as high as 420 million, ranking first in the world, and the stock of waste tires reached 140 million, ranking second in the world. As of 2010, the...

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Problems solved by technology

Patent CN102337035A involves a kind of plastic modifier, which uses inorganic fillers such as talcum powder, diatomaceous earth, and carbon black with a particle size of 200-800 meshes to treat waste plastics, supplemented by compatibilizers such as aromatic oil and third-line oil, and effectively improves The storage stability of factory plastic modified asphalt was tested, but the low temperature performance of plastic modified asphalt was not dealt with

[0005] In addition, the patent CN1837291A discloses the composite modification technology of styrene-butadiene rubber, plastics such as PE, and thermoplastic elastomers such as SBS, but it does not involve waste rubber powder and waste plastics, especially because waste rubber powder and waste plastics are used Afterwards, many of the components have changed, and it is difficult to control the impact of this change on the modifier by the existing technology

CN101045821A discloses a two-step modification process of waste packaging EVA and waste rubber powder, but this technology only blends the two under a shearing machine, and the storage stability of asphalt is poor

CN102020860A Use polyethylene, styrene, styrene-butadiene rubber and other raw materials to realize the modification of rubber-plastic composites. To graft rubber-plastic blends, it is necessary to introduce various admixtures such as active agents, accelerators, and anti-aging agents, and it is necessary to use new High-grade plastic and rubber are used as raw materials, which causes the problem of high cost

CN102766337A relates to non-precipitating rubber-modified asphalt, adding waste rubber powder to 2-3% recycled polystyrene plastic particles in a certain proportion, supplemented by organic acid anhydrides, active agents and other additives, so that the rubber powder can be bonded with polystyrene branch, and then extruded and granulated by twin-screw machine, so that the rubber powder does not precipitate or segregate in asphalt, and improves storage stability, but this technology cannot control the grafting ratio of rubber powder and polystyrene, and the plastic is limited to polystyrene , and because the grafting reaction is difficult to control, the effect of its modification is actually not as good as the high and low temperature performance of asphalt obtained by the modification of the two alone, that is, the modification effect of the two polymers is lost to a certain extent and cannot be achieved. better effect

[0006] To sum up, the above-mentioned patents have made some progress in the treatment of plastics and rubbers individually modified or compositely modified, but there are still waste plastics that affect the low-temperature performance of asphalt, and waste tire rubber powder has a high viscosity, both of which are easy to segregate and need to be processed. Problems such as special pretreatment have seriously affected the research on the use of these substances to obtain modified asphalt

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