Effects of Condensed Sodium Phosphates as a Degumming Aid Reagent for Raw Silk Fabric

견의 정연조제로서 축합인산염의 효과에 관한 연구

The effects of sodium pyrophosphate, sodium tripolyphosposphate and ethylene diamine tetraacetic acid as a degumming aid reagent were investigated under the conditions of underground water and dimineralized water for the scouring water sources. The changes of water qualities by adding the condensed sodium phosphates and the physical properties of scoured silk fabric were examined, respectively. 1. The water hardness of underground water was decreased by adding the condensed sodium phosphates and it was further reduced according to the increasing temperature. The water hardness reducing power of sodium pyrophosphate was a little stronger than that of sodium tripolyphosphate. 2. The sodium silicate as an alkaline reagant for scouring decreased the water hardness, but the sodium carbonate increased it in the underground water. 3. The pH value of 0.4% soap and 0.25% sodium silicate mixed solution after boiling was. 9.80, but it was leveled upto 9.90 by adding 0.05% sodium pyrophosphate and upto 9.95 by 0.02% ehtylene diamine tetraacetic acid, respectively. 4. The masking action of Fe$\^$3+/ ions dissolved in the scouring water was more remarkable by ethylene diamine tetraacetic acid than by the condensed sodium phosphates. Of the condensations, sodium tripolyphosphate was more effective than sodium pyrophosphate in the action. 5. Genrally, the dimineralized water scouring increased the boil-off ratio with reducing the flexural rigidity of fabric which was negatively related with the favorablility of hand-touch more than the underground one did. 6. Under the underground water scouring, the addition of ethylene diamine tetraacetic acid increased the boil-of ratio and compressive elasticity of fabric with reducing the flexural rigidity more than that of the condensed sodium phosphates did. 7 The additions of sodium tripolyphosphate and ethylene diamine tetraacetic acid reduced the flexural rigidity of fabric with raising the boil-off ratio even in the dimineralized water scouring, but there was no sifnificant difference between both of them.

견직물의 정연에 있어서 축합인산염 sodium pyrophosphate (S.T.P.) 및 sodium tripolyphosphate (S.T.P.)와 금속 이온봉쇄제 ethylene diamine tetraacetic acid-2Na (E.D.T.A.)의 정연조제로서의 효과를 검토하고자 지하수와 Na형 이온교환연수를 사용한 정연용수에 있어서 이들 정연조제의 첨가가 수질과 정연견의 품질에 어떻게 영향을 미치는가를 구명하기 위한 시험결과 다음과 같은 결과를 얻었다. 1. 정연용수에 축합인산염을 첨가하면 경도가 감소되었으며 경도제거효과는 온도증가와 함께 현저히 향상되었고 동일처리농도에서는 S.P.P. 가 S.T.P. 보다 약간경도제거 효과가 높았다. 2. 정연용수에 알카리제로서 탄산소오다를 사용하면 경도가 증가되었으나 규산소오다를 첨가하면 경도가 감소되었다. 3. 정연종료시 정연액의 pH가는 S.P.P. 첨가구가 9.90, E.D.T.A.-2Na 첨가구는 9.95로서 대조인 미첨가구 9.80에 비하여 약간씩 높았다. 4. 축합인산염에 비하여 E.D.T.A-2Na가 용수중의 Fe$^{3+}$ 이온봉쇄작용에 효과적이었으며 축합인산염 중에서는 S.T.P.가 S.P.P.에 비하여 우수하였다. 5. 견포 연감률은 Na형이온교환연수 정연이 지하수정연에 비하여 높았고 견포의 굴곡강도(mgㆍcm)는 30.6으로서 지하수 정연구의 37.1 보다 감소되었다. 6. 지하수 정연에 있어서 E.D.T.A.-2Na첨가구가 축합인산염 첨가구에 비하여 연감률이 높고 강연도가 감소되며 압축탄성률이 향상되었다. 7. Na형 이온교환연수 정연에있어서 축합인산염과 E.D.T.A-2Na를 첨가하면 연감률향상 및 굴곡강도 감소의 효과가 있었지만 양 처리간의 유의차는 인정되지 않았다.