Preparation method and application of asphalt modified material based on activated waste rubber powder

Abstract

The invention discloses a preparation method of an asphalt modified material based on activated waste rubber powder. The method comprises the following steps: (1) preparation of an epoxy acrylic block polymer: weighing 15-20 parts by weight of epoxy resin and 15-20 parts by weight of styrene monomer, gradually heating to 85-95 DEG C under ball-milling and stirring conditions, then slowly dropwise adding 5-10 parts by weight of acrylic monomer, keeping the constant temperature until the reaction is complete, then cooling to 20-25 DEG C, and separating out grinding balls to obtain an epoxy acrylic block polymer; (2) activation of the waste rubber powder: uniformly grinding 40-100 parts by weight of the waste rubber powder and 4-8 parts by weight of a desulfurizing agent, then putting into 150-200 parts by weight of an organic solvent, performing stirring at a low speed until the materials are uniformly mixed, then adding 5-10 parts by weight of the epoxy acrylic block polymer obtained in the step (1), performing shearing and homogenizing at a high speed to obtain mixed slurry, drying the mixed slurry, recovering the organic solvent in the slurry, and cooling to normal temperature to obtain the asphalt modified material based on the activated waste rubber powder. According to the invention, the asphalt pavement has low-temperature crack resistance, and the service life is effectively prolonged.

Description

technical field [0001] The invention relates to a preparation method of an asphalt modified material, in particular to a preparation method and application of an activated waste rubber powder-based asphalt modified material. Background technique [0002] Tire is a kind of polymer material, which is extremely difficult to degrade. It takes hundreds of years to degrade in the soil. If it is disposed of randomly, it will not only waste land resources, but also cause serious harm to the environment. Therefore, the recycling of waste tires has become an urgent unresolved issues. Rubber asphalt can be obtained by making rubber powder from automobile waste tire rubber and adding it to base asphalt in a certain proportion. The asphalt pavement prepared with rubber asphalt not only has high resistance to deformation and fatigue cracking at low temperature, but also reduces road noise, effectively improving the road performance and driving comfort of asphalt pavement; at the same tim...

AI Technical Summary

Problems solved by technology

However, when the heating temperature exceeds 200°C, the asphalt is prone to short-term aging and reduces the service life of the asphalt

Patent CN107541081A discloses a preparation process of activated waste rubber powder modified asphalt. The invention patent activates waste rubber powder by microwave radiation, and uses 80 mesh waste rubber powder and asphalt to prepare modified asphalt by high-speed shearing. However, the microwave activation power will affect the degree of activation, and the scope of application of this method is limited.