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US 11,230,652 B2Granted
Self-healing water-swellable hydraulic seal
AssigneeDanfoss Power Solutions II Technology A/S
InventorsJames Patrick Barnhouse, Aaron David Clark, Kelly Ann Williams
Life of this patent
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Abstract
A self-healing hydraulic seal is provided. The self-healing hydraulic seal is prepared from a water-swellable elastomeric composition comprising a base polymer and a plant-based polysaccharide.
Claims14
A self-healing hydraulic seal prepared from a water-swellable elastomeric composition comprising
- (i) 100 pph of a base polymer comprising acrylonitrile butadiene rubber (NBR);
- (ii) 10-100 pph of a plant-based polysaccharide, wherein the plant-based polysaccharide is a fibrous non-starch polysaccharide comprising carrot fiber;
- (iii) 5-20 pph of a diffusion promoter selected from the group consisting of sodium acetate, potassium acetate, sodium formate, potassium formate, sodium triphosphate, potassium triphosphate, sodium polyphosphate, potassium polyphosphate, sodium carbonate, and potassium carbonate;
- (iv) 5-20 pph of a fluid retaining agent selected from the group consisting of kaolinite, illite, chlorite, bentonite, calcium bentonite, and sodium bentonite;
- and
- (v) 5-50 pph of a silica reinforcing filler.
3 more elements
A method for preparing a self-healing hydraulic seal article from a water-swellable elastomeric composition comprising
- (i) 100 pph of a base polymer comprising an acrylonitrile butadiene rubber (NBR);
- (ii) 10-100 pph of a plant-based polysaccharide, wherein the plant-based polysaccharide is a fibrous non-starch polysaccharide comprising carrot fiber;
- (iii) 5-20 pph of a diffusion promoter;
- (iv) 5-20 pph of a fluid retaining agent selected from the group consisting of kaolinite, illite, chlorite, bentonite, calcium bentonite, and sodium bentonite;
- and
- (v) 5-50 pph of a silica reinforcing filler, the method comprising mixing the composition with a Banbury rubber mixer, milling the rubber, applying to seal dimensional mold, and curing the seal article.
3 more elements
Dependencies are inferred from the claim text.