A high-pressure-resistant water-permeable porous material and a preparation method thereof

Abstract

The invention belongs to the field of porous materials and discloses a high-pressure-resistant water-permeable porous material and a preparation method thereof. The porous material comprises following five components: a vinyl monomer, an oxidation-reduction initiator, a surfactant, water, and a powder filling material subjected to surface treatment with silane, or comprises the five components and aggregate. The porous material is prepared by injecting a slurry mixture formed by the five components or a uniform mixture of the slurry mixture and a large-diameter organic filling material into a mould, or injecting the slurry mixture or the mixture of the slurry mixture and the large-diameter organic filling material into a mould of a macroporous three-dimensional mesh material, curing and moulding. The cured and moulded porous material has excellent gas permeability, water permeability and high-pressure resistance. The compressive strength of the porous material is higher than 33 MPa. The bending strength of the porous material is higher than 14 MPa, and the porosity (open pores) is higher than 20%. The porous material can be repeatedly used for a plurality of times. The porous material can be used for manufacturing ceramic high-pressure slip casting moulds and used in the field of building materials and the field of water filtration and purification, and the like.

Description

technical field [0001] The invention belongs to the field of porous materials, and in particular relates to a high-pressure-resistant water-permeable material and a preparation method thereof. Background technique [0002] In the ceramic industry, high-pressure grouting (pressure up to 4MPa) has the advantages of short cycle, high efficiency, good body quality, no need for trimming, high strength, no drying, high surface finish, continuous grouting, high level of mechanization and automation, The production line occupies a small area, has a good operating environment, and has less environmental waste. It can not only greatly improve product quality, grade, and production efficiency, but also greatly reduce labor costs, labor intensity, and save labor places, reduce environmental pollution, and high-pressure Grouting has been widely used in the United States, Germany, Japan, Italy and other developed countries. They have obtained huge economic and social benefits. It can be u...

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Problems solved by technology

[0005] At present, the mechanical strength, heat resistance, and chemical corrosion resistance of ceramic pressure grouting molds made of epoxy resin-based micro-porous permeable materials are low, and the flexural strength is generally below 10MPa. (See Chinese Patent Application No. 98117513.9 "A Resin Mold Material", 200910166349.1 "A Weather-Resistant Water-Permeable Material and Its Use"), poor high pressure resistance

The literature (Chinese patent application number 201210476739.0 "a composite water-permeable material, its manufacturing method and derivative products") introduces chemical materials such as PE, PVC or PP as the main material, and fillers and release agents with nano-scale pores. and a plasticizer as a porogen to form a water-permeable material with an interconnected microporous structure; the document (Chinese Patent Application No. 200810045396.6 "Method for preparing open-cell microporous plastic profiles by semi-melt extrusion") adjusts the powder Particle size, additives, and molding process conditions are controlled to obtain open-cell microporous plastic products; the literature (Chinese Patent Application No. 200810120988.X "Microporous Plastic Filter Element and Its Preparation Method") uses polyethylene or polypropylene or their Mixture pressing method to form microporous plastics, but these methods are difficult to control the opening rate, low toughness, poor high-pressure alternating performance, and it is difficult to form various mold materials with complex shapes.

Documents (Chinese Patent Application No. 201110370935.5 "Method for preparing porous materials by reversible addition chain scission transfer polymerization of high internal phase emulsion", 201210233736.4 "Method for preparing open-cell submicron porous polymer materials by miniemulsion template method") introduced in 60 Liquid-phase pore-forming method for preparing porous materials by polymerization above ℃, the polymerization time is as long as 24 to 48 hours, and the weight ratio of water phase is high, so the prepared porous materials have low strength

The literature (Chinese Patent Application No. 200710039514.8 "An inverse emulsion template method for preparing open-cell polymer materials") uses water-soluble ammonium persulfate or potassium persulfate as the initiator and cationic surfactant as the emulsifier. Open-cell polymer materials are prepared by polymerizing vinyl monomers at 65-75°C for 10-14 hours. Water accounts for 60-98% of the system volume. The prepared porous materials have low strength and long preparation cycle

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