Technology development of liquid finishing of chrome-tanned goatskin

Abstract

There has been developed resource-saving environmentally friendly technology for producing chrome-tanned goatskin for shoe upper using new synthetic materials, which involves neutralization in the presence of Politan BN – syntan-neutralizer based on naphthalene sulfonic acid (Codyeco S.p.a., Italy) in the amount of 3.6% (in terms of dry residue), fatliquoring with a mixture of drugs Sulphirol C – a fatliquoring drug based on sulfonated fish oil, resistant to electrolytes (Smit & Zoon, Netherlands) and SMX 473 – a semi-synthetic composition based on sulfonated and sulphated fats (Shebekinsky industrial chemistry, Russia) in the ratio of 70:30 with a total fat consumption of 5.0% (in terms of 100% fat), retanning-filling Retanal LMV 100 – retanning agent based on melamine (Cromogenia Units, Spain) in the amount of 4.5% (in terms of dry residue). This allows to expand the range of chemical materials for liquid finishing and increase production efficiency (conditional economic benefit is UAH 9.22 per 1 m2 of finished products due to more rational use of raw and material resources), while increasing the uniformity of distribution of tensile strength in different areas of the skin, strength of surface, elongation at strain 10 MPa in 1.2-1.4 times, the skin yield by area increases by 1.8%, and its grade – by 0.7%; improve the physical, mechanical and hygienic properties of the skin; reduce the harmful load on the environment. The technology has passed production tests at PJSC “Chinbar” (Kyiv, Ukraine) and is ready for implementation at tanneries.