Method for the preparation of water-repellant hardened moldings

Details Method for the preparation of water-repellant hardened moldings Method for the preparation of water-repellant hardened moldings

1993-03-18

1994-04-12

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264 86, B28B 126, B28B 300

Patent

active

053023358

ABSTRACT:
A method for the fabrication of water-repellent hardened moldings wherein the diorganopolysiloxane is not discharged into the effluent water during the molding or forming process and the molding itself is free of nonuniformities in its water repellency. The method for the preparation of water-repellent hardened moldings includes forming a slurry of a mixture including a calcareous raw material and a siliceous raw material in an arbitrary quantity of water; emulsifying a diorganopolysiloxane using nonionic surfactant and adding this emulsion to the slurry at a temperature at or above the cloud point of the nonionic surfactant; subsequentially draining off the water, then molding or forming, and finally drying or steam-curing to produce the water-repellent hardened molding.

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