Method for preparing polyurethane/rubber interpenetrating network type water-swellable rubber

Abstract

The invention belongs to the technical field of sealing materials and relates to a method for preparing polyurethane / rubber interpenetrating network type water-swellable rubber. The method comprises the following steps: firstly, mixing rubber and super-absorbent resin for 10 to 40 minutes in an open mill; further adding solid softener, colorant, anti-ager and promoter to the open mill, and mixing for 10 to 40 minutes; then, adding zinc oxide, reinforcing agent and plasticizer to the open mill, and mixing for 10 to 50 minutes; further adding vulcanizer to the open mill, and mixing to obtain a mixture A; evenly mixing polyethylene glycol and MDI (methyl-di-p-phenylene isocyanate) by equal molar weight to obtain a mixture B; blending the mixture A and the mixture B in the open mill to obtain a product; and finally, vulcanizing the product in a mold on a plate vulcanization machine with the temperature and pressure being respectively controlled at 150 to 160 DEG C and at 10MPa to 15MPa, to obtain the interpenetrating network type water-swellable rubber. The method of the invention has the advantages of simple preparation process, high product expansion ratio, high ion resistance and controllable water absorption rate and mechanical properties.

Description

Technical field: [0001] The invention belongs to the technical field of sealing materials, and relates to a preparation method of polyurethane and rubber interpenetrating network type water-swellable rubber that can be widely used in oil fields, tunnels, subways, water conservancy and other occasions. Background technique: [0002] Water-swellable rubber is a new type of functional water-absorbing material, which is prepared by introducing hydrophilic functional groups or hydrophilic components into traditional elastic substrates. Since it came out in the 1970s, it has attracted more and more people's attention because of its unique dual water-stop characteristics of elastic sealing and water-absorbing expansion, and its research and development work has also made rapid progress. These new materials can be widely used in tunnels, subways, swimming pools, basements, armories, urban water supply facilities, offshore oil production, underwater engineering, civil buildings and o...

AI Technical Summary

Problems solved by technology

Resin-type water-swellable rubber has excellent swelling properties in fresh water, and the expansion ratio in salt water is significantly reduced, and the water-swellable ratio decreases with the increase of salinity. In the case of high salinity, water-swellable rubber Almost no expansion, can not achieve the ideal expansion effect, can not be widely used in oil field production engineering technology