Impregnated materials for leak prevention
阅读：452发布：2021-12-29
专利汇可以提供Impregnated materials for leak prevention专利检索，专利查询，专利分析的服务。并且A permeable, deformable substrate impregnated with an isocyanatterminated, hydrophilic urethane prepolymer is used to stop water leaks in small holes or crevices by positioning the impregnated material therein, the prepolymer reacting with water to form a swollen, adherent, waterinsoluble hydrogel.，下面是Impregnated materials for leak prevention专利的具体信息内容。
1. A DEFORMABLE, PERMEABLE SUBSTRATE COMPRISING EXPANDED VERMICULITE ENCLOSED IN A NON-WOVEN WEB ENVELOPE, SAID VERMICULITE BEING IMPREGNATED WITH A HYDROPHILIC PREPOLYMER, SAID PREPOLYMER BEING A WATER-MISCIBLE ISOCYANATE-TERMINATED PREPOLYMER HAVING A PLURALITY OF OXYETHYLENE UNITS AND THE FORMULA:
2. The substrate according to claim 1 where the impregnated vermiculite enclosed in the non-woven web envelope is enclosed in a rupturable water-impermeable envelope.
3. A structure normally having discontinuities therein susceptible to leakage, said discontinuities being sealed by an impregnated permeable deformable substrate comprising expanded vermiculite enclosed in a non-woven web envelope, said vermiculite containing a hydrophilic polyurethane prepolymer which is cured and polymerized in situ in the presence of water to form a hydrophilic, water-insoluble poly(urethane-urea) forming a water impermeable barrier in said discontinuities, said prepolymer having the formula: Y1-((CH2CH2O)0 -CONH-R-(NCO)p)z where Y1 is an active hydrogen-free residue of a polyhydroxyalkane, (CH2CH2O)0 is a hydrophilic polyoxyethylene chain, 0 is the number of oxyethylene units in said chain, 0 being from about 15 to 50, R is an aromatic nucleus, p is an integer equal to q-1, where q is the number of isocyanate moieties of a polyisocyanate precursor, and z is a number equal to the hydroxyl functionality of said polyhydroxyalkane.
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