Reactive Softener

Reactive Softener Reactive softener have reactive groups in them which react with the fiber substance and yield a softening effect. The bond is definite covalent bond, formed in the prsence of an acid catalyst of elevated temeratures. PROPERTIES of REACTIVE SOFTENER: •

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Thus softener posses a reactive group, such as sulphonic acid, isocyanate group etc. Which react with the hydroxyl groups of the substrate Their application is also similar to non-ionic softeners (Temporary effects are obtained when not cured) and to durable softeners. Applied in acidic medium i,e. at PH 4 to 5. Solubility Good. Easily soluble in hot & cold water. Stability Stable to hard water & metals. Compatibility Compatible with cationic, anionic, acids & mild alkalies. It gives softness & body filling effect surface smoothness and lubricity on cotton, polyester and on polyester-cotton blends, polyester-viscose blends etc. It is very stable to high drying temperatures Being extra white, it gives brightness to the fabric. It gives brightness to the fabric. Yellowing is observed on the finished fabrics. It is very effective on Turkish towels.

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OLDEST REACTIVE SOFTENER: Stearyl amidomethyl pyrimidium chloride is one of the oldest products of this class. Due to liberation of pyridine and possible yellowing, its use is restricted.

C17H35 CO-NHCH2 (C5H5N+) CL.Stearyl amidomethyl pyridinium chloride

Softener based on dissocyanate monoethanolamine: .

The reaction product of disocyanate monoethanolamine and higher alkyl isocyanate are softeners based on dissocyanate monoethanolamine. Further products prepared from cyclopropane monocarbonic acid, monoethanolamine and higher alkyl isocyanate are used as reactive softeners

C18H37 NHCO – C2H4 – NHCO

Softener based on cyclopropane monocarbonic acid.

O NH O =

C NH OH

Softener based on N – methylol based derivative with higher fatty acid. .

Softener based on 1,3,5 triazine: Softener based on 1,3,5 triazine are prepared using the idea of reactive dyes; a strong hydrophobic higher alkyl group is attached through – NH – bridge to a mono or dichloro-1,3,5 triazine group. Moreover, a great variety of polyethylene glycol modified triazine compounds are available as reactive softeners. CL

N

N R

X

N

NH

Softener based on 1,3,5 triazine

Y N

N

Y N

N

N

O

N

N

Z

Softener based on polyethylene glycol modified triazine compounds

Softener based on octadecyl ethylene urea: Softeners based on octadecyl ethylene urea import durable water repellency with softening effect. This may be applied such as DMDHEU, DMEU, etc. by pad dry cure techniques of 0.6 - 2.5% owt can be used. C18H37

O NH N

Softener based on octadecyl ethylene urea.

Softener based on epoxy compound: Softener based on epoxy compounds are applied to cotton and wool fibers

O R1 O OH R

Softener based on epoxy compound

Softener based on carbamates : Recently developed softeners are considers are condensation products of appropriate carbamates with formaldehyde. On the other hand, amidourethane with cyclopropanyl reactive groups are softeners reacting without a catalyst. Stcorylamine apichlorohydrin based softener also produce durable softening.

OH RO – CO – N OH Softener based on carbamates