These surfactants, in addition to their ability to mulsify mulsify oily soils into wash oily soils into wash solutions, can lift soils, including particulates, from surfaces.. Khái n
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Anionic surfactants are the most
commonly used class of
surfactants in cleansing
applications These surfactants,
in addition to their ability to
mulsify
mulsify oily soils into wash oily soils into wash
solutions, can lift soils, including
particulates, from surfaces
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Learning action
OSO 3
-1 Khái niệm chung anionic
Anionic Surfactants are dissociated in water in an amphiphilic anion*, and a cation
cation*, *, which which is is in in general general an an alcaline
alcaline metal metal (Na+, (Na+, K+) K+) or or a a quaternary ammonium ammonium They are
are the the most most commonly commonly used used surfactants
surfactants
Trang 2 Anionics Anionics can be classified can be classified
according to the polar group
and the following will be
considered:
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They include alkylbenzene
sulfonates ( detergents …), (fatty
acid) soaps…, lauryl sulfate
( foaming agent …), di-alkyl
sulfosuccinate ( wetting agent …),
lignosulfonates ( dispersants …)
etc…
Anionic surfactants account for
about 50 % of the world
production.
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-,-OSO3-.
Khả năng tẩy rửa: mạnh, lấy dầu
cao…
Khả năng phân hủy sinh học…
Hay dùng và hay có trong các bài kiểm tra
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Alkylbenzene sulfonates are a class of
anionic surfactants , consisting of a
hydrophilic sulfonate head-group and a
hydrophobic alkylbenzene tail-group Along with SLES they are one of the oldest and most widely used synthetic detergents and may be found in numerous personal-care products ( soaps , shampoos , toothpaste
etc.) and household-care products ( laundry detergent , dishwashing liquid , spray cleaner etc.).
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They They were were first first introduced introduced in in the the 1930 1930s s in in
sulfonates
sulfonates (LAS) (LAS) during during the the 1960 1960s s Since Since
then
then production production has has increased increased significantly significantly
from
from about about 1 1 million million tons tons in in 1980 1980,, to to around around
3
3 5 5 million million tons tons in in 2016 2016,, making making them them most most
produced
produced anionic anionic surfactant surfactant after after soaps
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SLS
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Sodium dodecyl sulfate (SDS), synonymously
sodium lauryl sulfate (SLS), or sodium
laurilsulfate, is a synthetic organic compound
with the formula CH3(CH2)11SO4Na It is an
anionic surfactantused in many cleaning and
hygiene products The sodium saltis of an
organosulfateclass of organics It consists of a
12-carbon tail attached to a sulfategroup, that
is, it is the sodium salt of dodecyl hydrogen
acid
Its hydrocarbon tail combined with a polar
" headgroup " give the compound amphiphilic
properties and so make it useful as a
detergent [[not verified in body]] Also derived as a component of mixtures produced from inexpensive coconut and palm oils , SDS is a common component of many domestic cleaning, personal hygiene and cosmetic, pharmaceutical, and food products, as well
as of industrial and commercial cleaning and
product formulations [[not verified in body]]
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Sodium laureth sulfate
Sodium Sodium laureth laureth sulfate sulfate ((SLES SLES),), anan acceptedaccepted contraction
contraction ofof sodium sodium lauryl lauryl ether ether sulfate sulfate
((SLES SLES),), isis anan anionicanionic detergent and surfactant found
found inin manymany personalpersonal carecare productsproducts ((soaps,, shampoos,, toothpaste etcetc )) SLES is an inexpensive
inexpensive andand veryvery effectiveeffective foamingfoaming agentagent [[1
SLES, sodiumsodium lauryllauryl sulfatesulfate (SLS), ammonium lauryl
lauryl sulfatesulfate (ALS),(ALS), andand sodiumsodium parethpareth sulfatesulfate aresurfactantsthatthat areare usedused inin manymany cosmeticcosmetic products
products forfor theirtheir cleaningcleaning andand emulsifyingemulsifying properties
properties TheyThey behavebehave similarlysimilarly totosoap
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Its chemical formula is
C
CH H3(CH2))11(( O CH2CH2))nO S O3Na
Sometimes
Sometimes the the number number represented represented by by
n
n is is specified specified in in the the name, name, for for example example
laureth
laureth 2 2 sulfate sulfate The product is
heterogeneous in the number of
ethoxyl
ethoxyl groups groups ,, where where n n is is the the mean mean It It
is
is common common for for commercial commercial products products for for
n
n= = 3 3
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