Composite particle, and preparation method and application thereof
A technology of composite particles and elastic particles, applied in the field of oil and gas well cementing, can solve the problems of limited use, easy to float, temperature resistance, poor temperature resistance, etc., and achieves improved mechanical properties, improved hydrophilic properties, and good stability. Effect
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Embodiment 1
[0033] 100 parts by weight, average particle size of 120 microns, particle size d 50 = 123 microns, elastic modulus of 0.6GPa, Shore hardness of 70, and 30 parts of nitrile rubber particles with a carbon content of 0.5wt% added to the spherical silica fume (average particle size is 1.45 microns, particle size d 50 =1.40 microns, stir uniformly, and adjust the composite particle mixing system (Tsinghua University, PCS-1) to rotate at 2500 rpm, control the feed rate to 5kg / min, and cover for 30 minutes. The average particle size is 180 microns. Path d 50 = 175 micron composite particles.
Embodiment 2
[0035] 100 parts by weight, average particle size of 180 microns, particle size d 50 = 165 microns, elastic modulus of 0.8GPa, Shore hardness of 85, 0.5% carbon content of styrene butadiene rubber particles added to 20 parts by weight after spheronization, average particle size is 5.6 microns, particle size d 50 =5.4 microns, 0.5% carbon content of fly ash, stir evenly, and adjust the PCS-1 rotation speed 2000 rpm, control the feed rate 5kg / min, the coating time 20 minutes, the average particle size of the collected product is 250 Micron, particle size d 50 = 240 micron composite particles.
Embodiment 3
[0037] 100 parts by weight, average particle size of 120 microns, particle size d 50 = 125 microns, elastic modulus of 0.5 GPa, Shore hardness of 60, 0.5% carbon content of styrene butadiene rubber particles added to 10 parts by weight after spheronization, the average particle size is 1.6 microns, particle size d 50 =1.2 micron metakaolin, stir evenly, and adjust the PCS-1 rotation speed to 1000 rpm, control the feed rate 5kg / min, the coating time 20 minutes, the average particle size of the collected product is 215 microns, the particle size d 50 = 220 micron composite particles.
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