2 Chemistry of Insect Resist Finishes

Finishing of Textiles

Insect Resist Finishes

Main Points . 1-Introduction . 2- Mechanisms of Insect Resist Finishes. 3-Chemistry of Insect Resist Finishes . Application of Insect Resist Finishes . ِِِ 45-Evaluation of Insect Resist Finishes . ِ 67--Troubleshooting for Insect Resist Finishes . Dust mites.

Introduction . Insect resist finishes

Chemical treatments Wool

Other animal fibres

Dust mites Allergy

Neurodermitis

Asthma

Fur beetle

The clothes moth

Keratin-digesting pests

Carpet beetle

Brown house moth

Moth populations can increase dramattically in arelatively short time .

- Various chemicals have been used to control damage from larval attack on wool Insect resist finishes .

1-The carpet industry. 1-The carpet industry . 2-Floor coverings . 3- blankets&uniforms . 4-upholstery fabrics

Mechanisms of insect resist finishes . Insect resist finishes

Poisons

Nerve poisons

Poisons

- Interfere with the keratin digesting process of the larvae.

- Killing the feeding larvae .

- By blocking enzymes need for digestion. -lower environmental hazard than nerve poisons.

-Not effective against some pests .

Nerve Poisons

- Control agents . -Affecting a broader range of

insects

-More rapidly biodegraded than poisons . -Less durabillity .

Chemistry of insect resist finishes .

Flucofenuron

Chlorinated triphenyl methane

slucofenuron

chlorphenylids

Dieldrin . 1- One of the original nerve poisons.

2-Higly toxic to mammals.

3- Banned in most countries

Permethrin 1- very effective . against

moth larvae. 2-Less effect on Anthrenus beetles. 3- combination products of permthrin and hexahydropyrimidine derivatives.

Application of insect resist finishes.

During Dyeing

Insect resist finish

During scouring

During spining

During dyeing

- The best light and wet fastness properties

The finish is able fully penetrate the fibres

-Exhaust well to nylon.

-cholrphenylid drivatives.

-Leaving wool

unprotected.

-Permethrin-based products .

- Distribute them selves more uniformly between two fibres .

During Scouring .

-For carpets, blankets &upholstery.

-Do not completely penetrate the fibres. - Lower temperatures & shorter time for treatment in process .

- So fastness properties are not durable .

During Spinning . - Combine the finish with spinning lubricants . -Then to apply the combination to loose wool prior to spinning -Produces yarns with only superficial treatment .

- Much lower fastness .

Evaluation. Microscopic methods

Measure the weight loss of the treated fabrics

Measure the weight of insect excrement .

Troubleshooting . 1-Exposure to light , dry cleaning and shampooing can reduce the effectiveness of finish . 2- Finish baths that are not completely depleted of insect finishes. 3-Special are must be taken to prevent release of these insect poisons to the environment .

Finishes for protection from dust mites .

Pillows ,bedding and quilts.

upholstery

Dust mites

Mattresses

carpets

Lower room temp.

Protection. Repeated airing

Cleaning & washing

Protection from dust mites. Bed covers

Sheeting Tight woven fabrics .

Similar textiles

- Micro encapsulation is another interesting possibility for

application.

Conclusion . Insect resist finish . Mechanisms of insect resist finishes . Chemistry of insect resist finishes .

Application of insect resist finishes . Evaluation of insect resist finishes . Troubleshooting of insect resist finishes .

Dust mites .

Any questions