DEFOAMER-CONTAINING LAUNDRY DETERGENT Russian patent published in 2012 - IPC C11D3/00 

FIELD: chemistry.

SUBSTANCE: alkaline detergent for fabric hand washing contains a foaming surfactant, polyethylene imine defoamer having empirical formula (PEI)_aEO)_b(PO)_c (I), where a assumes a value from 100 to 100000, b assumes a value from 5 to 60 and c assumes a value from 2 to 60; and a pH control system. When said detergent is diluted with water in weight ratio 1:350 in order to prepare a washing solution and during washing, the pH control system keeps pH of the washing solution at temperature 20°C higher than 8. The present invention relates to a method for hand washing fabric, involving steps for providing the laundry detergent, preparing the washing solution by diluting the detergent with water in weight ratio from 1:150 to 1:1000, keeping pH of the washing solution higher than 9, hand washing the fabric in the washing solution, keeping pH of the washing solution between 9 and 13 during the washing step, rinsing the linen in a rinsing bath, wherein pH of the rinsing bath is lower than 9. The invention also relates to a method of saving water, involving a step for washing fabric in accordance with the hand washing method.

EFFECT: reduced foaming after the first rinsing.

12 cl, 4 ex, 1 tbl