عنوان تحقیق : طبقه بندی صابون ها و مواد مغذی
تعداد صفحات : 68
زبان : انگلیسی
فرمت فایل : word
بخش هایی از متن تحقیق :
INTRODUCTION
Historical Background
Firstsynthetic detergents were produced in Germany in World War–I when animal fats were diverted to other wartime uses and were unavailable for soap manufacture. The first synthetics were short chain alkyl naphthalene sulphonates. They were only fair as detergents but are good wetting agents and are still used as textile auxiliaries .
In the late 1920 and early 1930s long chain alcohol sulphate were sold as the sodium salts together with sodium sulphate extender as the only other constituent . In the 1930s long chain a...