Granular dry modifier for asphalt and preparation method thereof
A granular, modifier technology, applied in building components, building insulation materials, buildings, etc., can solve the problems of negative impact on road performance of mixtures, limit the application of dry modification technology, and adversely affect the performance of matrix asphalt. The effect of improving construction flexibility, preventing powder from floating, and eliminating safety hazards
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Embodiment 1
[0046] After crushing the dry SBS particles into a powder with a particle size of 500 μm by using a high-speed mechanical impact mill at room temperature, add talcum powder to the SBS powder to form a mixture, wherein the weight ratio of SBS particles to talcum powder is 60 : 0.5;
[0047] Then put the mixture into a flat-die extruder with a cutting length of 15mm for cold granulation, cool down with cold water to make the temperature not higher than 80°C, and then further cool to room temperature. Mixtures with broken granules can be refluxed to regranulate.
[0048] The SBS used in the present invention can also be linear or star-shaped SBS of any one or two or more product types on the market, such as star-shaped 4301, linear 1301, linear LG501S, linear LG441, YH4303, etc.
[0049] It should be noted that the pulverized particle size of the SBS can be less than any value below 2000 μm, such as 1900, 1800, 1700, 1600, 1400, 13000, 1200, 1100, 1000, 900, 800, 700, 600, 400, ...
Embodiment 2
[0055] Add 0.1 parts by weight of CeO in addition to pulverizing the SBS particles 2 For abrasives with a content greater than 40%, a ring die extruder is used when the modifier is granulated, and the others are the same as in Example 1.
[0056] It should be noted that the technical purpose of the present invention can be realized within the scope of 0.05-0.1% of the weight of the SBS particles in the addition of the grinding agent, and the present invention uses CeO 2 The abrasive with a content greater than 40% uses its unique angular structure to repeatedly impact the SBS particles in the crushing process at high speed, further reducing the particle size and improving the crushing efficiency.
[0057] Of course, those skilled in the art can improve the pulverization efficiency of SBS particles in a more effective way.
[0058] The following examples are granular instant SBS modifiers prepared by using co-solvent or cross-linking main agent and cross-linking auxiliary agen...
Embodiment 3
[0060] 1. Crushing treatment
[0061] At room temperature, 80 parts of SBS particles in a dry state were pulverized into powders with a particle size of 100 μm using a stirring ball mill, during which CeO 2 The proportion is 0.1 parts by weight of SBS particles.
[0062] 2. Preparation of basic materials
[0063] Add 20 parts of solubilizing oil to the pulverized SBS powder, and stir evenly to obtain the base material.
[0064] 3. Granulation
[0065] Add the basic material obtained in step 2 into a flat-die extruder with a cutting length of 15mm for cold granulation, and then use water cooling to cool down in time so that the temperature during the granulation process is lower than or higher than 80°C. Finally, air cooling is used to further cool the modifier particles to room temperature to obtain a dry modifier, and the powder with damaged particles is refluxed for regranulation.
[0066] It should be noted that any value within the range of 20-30 parts of the solubiliz...
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