TAILIEUCHUNG - Materials Handbook 15th ed - G. Brady_ H. Clauser_ J. Vaccari (McGraw-Hill_ 2002) WW Part 16

Tham khảo tài liệu 'materials handbook 15th ed - g. brady_ h. clauser_ j. vaccari (mcgraw-hill_ 2002) ww part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1050 WOOL GREASE largely employed for the production of lanolin and its derivatives chiefly for cosmetics. Wool grease contains lanoceric acid lanopalmic acid C15H30O3 and lanosterol a high alcohol related to cholesterol. All of these can be broken down into derivatives. Lanolin is a purified and hydrated grease also known as lanain and in pharmacy as lanum and adeps lanae. It has a melting point of about 104 F 40 C and is soluble in alcohol. Lanolin is basically a wax consisting of esters of sterol alcohols combined with straightchain fatty acids and with only a small proportion of free alcohols. It contains about 95 of fatty acid esters but its direct use as an emollient depends on the 5 of free alcohols and acids. However more than 30 derivatives are obtained from lanolin and these are used in blends to give specific properties to cosmetics. They are often marketed under trade names and some of the ingredients may be synthesized from raw materials other than wool grease or chemically altered from wool-grease derivatives. A variety of products used in cosmetics and pharmaceuticals are made by fractionation or chemical alteration of lanolin. They are also useful in compounding plastics and industrial coating but are generally too scarce and expensive for these purposes. Ethoxylated lanolin and ethoxylated lanolin alcohols are used in water-soluble emulsions and conditioners. Solulan is a general trade name for these materials. Lanolin oil and lanolin wax are made by solvent fractionation of lanolin. Viscolan and Waxolan are these products. Isopropyl lanolates with trade name Amerlate are soft hydrophylic solids which liquefy easily and are used in cosmetics as emollients emulsifiers and pigment dispersants. Amerlate LFA is derived from lanolin hydroxy acids containing iso-acids. The high hydroxyl content produces the emollient and emulsifying qualities. Barium lanolate made by saponification is used as an anticorrosion agent. It is antiphobic and is also used as .

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.