Influence of STPP on Fabric

January 22, 2021

Sodium tripolyphosphate(STPP), asable-bodied accepted as pentasodium triphosphate powder, pentasodium tripolyphosphate or sodium triphosphate, is acclimated in a advanced ambit of applications in the accomplish of charwoman articles and aliment bactericides as able-bodied as in baptize analysis accessories. STPP is a sodium alkali of triphosphoric acerbic that has the actualization of white clear crumb. It is odorless and is baptize acrid. In a awful controlled ambiance, it is fabricated by accumulation monosodium phosphate and disodium phosphate.

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Influence of builders on fabric

The effects of poly (vinyl alcohol) (PVA) and sodium tripolyphosphate (STPP) on anti-deposition of oily soil in washing process have been investigated. The amount of oily soil (oleic acid and triolein) deposited onto fabrics (cupra, nylon and polyester), and the relative amount of the builders adsorbed on fibers (cellulose, nylon and polyester) were measured. The following results were obtained:

1) The relative amounts of PVA adsorbed on each fiber were all higher than those of STPP.

2) The deposition of oily soil onto cupra fabric was slightly observed in water without the builders. A marked effect of anti-deposition on nylon and polyester fabrics, however, was found in the builder solutions.

3) PVA was more effective for the anti-deposition of oily soil onto all fabrics than STPP. It is suggested that the marked effect of anti-deposition is resulted from stronger adsorption of PVA than STPP on all fibers.

The influence of builders on calcium deposition on the fabric was studied by laundering the cotton fabric with sodium carbonate, sodium metasilicate, sodium tripolyphosphate as built detergents in hard water. The fabric was washed for 15 minutes at 23+1℃in a washing machine(Gold Star WP 3007) under the similar condition with those of home laundering, and rinsed 3 times in the same water hardness for 5 minutes. The calcium deposits on the fabric was determined by EDTA-BACK titration methods. The results of this study were as follows: 1) The amount of calcium deposits on the fabric was increased with increasing wash cycles. This deposit was due to the build up of insoluble calcium carbonate. 2) As the water hardness increased, the amount of calcium deposits on the fabric was increased. 3) Alkaline builders, such as, Na2CO3Na2CO3 and Na2SiO3Na2SiO3, promoted calcium deposition on the fabric, however STPP prevented calcium deposition on the fabric. 4) Fabric laundered with Na−DBS+Na2CO3Na−DBS+Na2CO3 showed the highest calcium deposits on the fabric, and decreased with the order of Na2CO3Na2CO3, Na−DBS+Na2SiO3Na−DBS+Na2SiO3, and Na-DBS. And fabrics washed with phosphate-built detergents showed a small amount of calcium deposition.


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