Method for grafting and activating powder rubber for modifying to pavement asphalt

Abstract

The invention discloses a synthetic utilizing method of waste rubber product to obtain grafted active modified tar, which comprises the following steps: grinding waste rubber product into 30-order powder rubber; blending 4-8% softening agent, 0.2-0.5% coking-proof agent, 0.3-0.6% heat stabilizer, 0.5-0.9% activator and 90-95% powder rubber to break chain through high-cutting equipment; obtaining activated powder rubber; stirring the compound of 10-25% activated powder rubber, 60-90% tar, 5-8% dissolving-increasing agent and 8-10% grafting agent through high-speed stirrer; obtaining the product.

Description

Technical field: [0001] The invention relates to a method for comprehensive utilization of waste rubber products. In particular, the method of modifying bitumen for laying municipal roads with graft activated powder rubber. Background technique: [0002] Petroleum asphalt has been used for laying roads for many years. Due to the temperature sensitivity of petroleum asphalt itself, its heat resistance and cold resistance are poor. When it is directly used for road construction, when the temperature is high in summer, The road surface is often softened due to the melting of petroleum asphalt; when the climate is cold in winter, the road surface is often brittle due to the poor cold resistance of petroleum asphalt. Therefore, when using petroleum asphalt to build roads, it is necessary to modify the petroleum asphalt to adapt to all-weather changes. [0003] Using powder rubber to modify asphalt to improve the performance of asphalt pavement has become a research hotspot in t...

AI Technical Summary

Problems solved by technology

However, at present, the production of powdered rubber generally adopts the freezing method, that is, after the waste rubber products are deep-frozen with liquid nitrogen, the molecular structure of the body is destroyed and crushed. This method is very expensive and not easy to be widely used.

Others use the normal temperature method to mechanically crush and grind the waste rubber products at normal temperature. The diameter of the powdered rubber particles obtained by this method is between 30-40 mesh, the particles are relatively large, and the spray holes are easy to block during use. The mixing temperature used is low, and the mixing time is short. After mixing, the powdered rubber and asphalt cannot be in a molten state, and the asphalt cannot be completely modified. The sensitivity to temperature has not been greatly improved. The disadvantage of softening, therefore, powder rubber has not been well applied on municipal roads