Super-hydrophobic ultralow-density high-strength polystyrene microsphere and preparation method thereof

Abstract

The invention discloses a super-hydrophobic ultralow-density high-strength polystyrene microsphere. The microsphere is prepared from the following raw materials in parts by weight: 0.025 to 15 parts of a dispersing agent, 10 to 20 parts of styrene, 0.5 to 3 parts of divinyl benzene, 0.5 to 10 parts of silane, 0.1 to 0.6 part of an initiator, 50 to 300 parts of deionized water and a proper amount of a pH regulator. Meanwhile, the invention also discloses a preparation method of the super-hydrophobic ultralow-density high-strength polystyrene microsphere. The preparation method comprises the following steps: preparing a water phase and an oil phase, carrying out mixing, adjusting a pH value, conducting heating, and carrying out suction filtration and washing. According to the super-hydrophobic ultralow-density high-strength polystyrene microsphere and the preparation method thereof in the invention, silane containing double bonds is introduced into a free radical polymerization system ofstyrene and divinyl benzene, silane hydrolysis is induced in the process of suspension free radical polymerization reaction, and the polystyrene microsphere with the surface having strong hydrophobicability is obtained. Moreover, through process regulation and control of the method disclosed by the invention, the super-hydrophobic polystyrene microsphere with high compressive strength and high yield is obtained under the condition of extremely low consumption of the crosslinking agent divinyl benzene.

Description

technical field [0001] The invention relates to the technical field of functional polymer materials, in particular to a super-hydrophobic, ultra-low-density, high-strength polystyrene microsphere and a preparation method thereof. Background technique [0002] In the process of oil and natural gas exploitation, petroleum fracturing proppant is a high-strength granular support that keeps the rock fractures in the deep formation in a cracked state. Its function is to support the two walls of the cracked cracks. When the pressure drops below the closure pressure of the rock formation, the fractures leading to each oil and gas hole in the formation remain open, which can greatly improve the permeability of the oil and gas layer and increase the output of the oil and gas field. [0003] At present, the traditional proppants are glass balls, metal balls, quartz sand, ceramsite and other inorganic substances or their coatings. These proppants generally have the following disadvantag...

AI Technical Summary

Problems solved by technology

[0004] 1. The specific weight is 2.0g / cm 3 The above results in high fluid viscosity, high pump pressure and high energy consumption when proppant is transported during the fracturing process;

[0005] 2. The roundness and sphericity are low, the surface is not smooth, and the equipment is seriously worn;

[0006] 3. It is easy to break, resulting in premature closure of cracks and affecting production;

[0007] 4. The surface is covered with film, which is easy to cause adhesion and cause pipeline blockage

However, this method introduces methyl methacrylate and tert-butylstyrene into the free radical copolymerization system of styrene and divinylbenzene, and the static water contact angle of the prepared microspheres after milling and tableting is 154.8°, but the surface of the unground microspheres did not show high hydrophobicity

In addition, the high compressive strength described by this method must be put into the reaction system by mass parts of divinylbenzene crosslinking monomer close to styrene, resulting in high cost of microsphere preparation

Images