Method for preparing water-expandable polyurethane elastomer

A polyurethane elastomer, water-swelling technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of large mass loss due to hydrostatic swelling, less repeatable expansion times, and low expansion rate, etc. The effect of high repeated expansion times and high expansion rate
CN101798376AInactive Publication Date: 2010-08-11QINGDAO UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO UNIV OF SCI & TECH
Publication Date
2010-08-11
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a method for preparing water-expandable polyurethane elastomer, comprising the following steps: adding polyether glycol, isocyanate, plasticizer and nano-filler at a weight ratio of 70-90: 10-20: 10-25: 3-5 to a reaction kettle; heating, stirring; preparing polyurethane prepolymer having free isocyano-content after vacuum dehydration and reaction; uniformly mixing the prepolymer, chain extendor or crosslinking agent and catalyst; vulcanizing at controlled temperature or vulcanizing at room temperature and then secondarily vulcanizing at controlled temperature to prepare high-performance water-expandable polyurethane elastomer. The prepared elastomer has wide adjustable range of rigidity, high strength, and small loss of weight after expansion; the expansivity is high with many times of repeated expansion, and the expansion magnification is adjustable; with simple production technology, the prepared expandable polyurethane elastomer is widely applied to engineering fields such as bridge, subway, tunnel, water supply and drainage, mine water prevention and water leakage prevention.
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Description

Technical field:

[0001] The invention relates to a method for preparing a high-performance water-swellable polyurethane elastomer. The prepared expanded polyurethane elastomer is widely used in engineering fields such as bridges, subways, tunnels, water supply and drainage, mine waterproofing, and leakage prevention, and belongs to the preparation of sealing materials Technical field. Background technique:

[0002] Water swellable elastomer is usually called water swellable rubber. It is a new type of functional polymer material with dual functions of elastic sealing and water swelling and water stopping. Since its inception in the 1970s, it has unique water stopping properties. It is widely favored by people and is widely used in waterproof and moisture-proof fields such as tunnel engineering, subway engineering, offshore oil production, precision instruments and municipal engineering. The usual water-swellable elastomer is made by introducing hydrophilic groups into the molecu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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