SPECIFICATIONS:

PROPERTIES:

1. AVCO-REZ ZFF is used in applications such as “wash and wear”, “permanent-press”, “shrinkage control” of cellulosic and polyester cellulose fabrics.

2. AVCO-REZ ZFF imparts zero formaldehyde levels on the treated fabrics, meeting ÖkoTex Standards. No released formaldehyde on the treated fabrics.

3. AVCO-REZ ZFF is fully compatible with other thermosetting resins, fluorocarbons, hand builders, softeners, dye fixatives and suitable optical brighteners.

4. The washing fastness and the dry cleaning fastnesses of treated fabrics to repeated laundries are excellent.

5. Minimizes tendency to yellowing when properly cured.

6. Good stability to chlorine in washing treatments.

7. Suitable for white and dyed fabrics, imparts comfortable handle.

8. AVCO-REZ ZFF can be applied to knitted and to woven fabrics.

9. The tensile strength loss caused by the resin is related to the quantity of the product applied. The application of AVCO-REZ ZFF together with AVCO-SOFT PE. (Polyethylene emulsion) minimizes the loss in the tensile strength.

APPLICATION:

AVCO-REZ ZFF is applied by padding method as suggested below. Ensure that the fabric is well prepared with good absorbency, and neutralized correctly. The fixing conditions such as time and temperature, the pH and the amount of the catalyst should be kept exactly according to the recipe recommendations.

The recommended pH of the finishing bath is 4.5. The curing should be carried out at 130°C for 1 minute.

1. Padding:

This is done normally at room temperature. Padding baths are prepared by simply diluting the resin with cold water and adding the catalyst and other finishing agents.

Adjust the pick-up to be 80%. The pH of the finishing bath should be adjusted to 4.4 – 4.7.

2. Drying:

After padding the fabric is dried at 120°C to reach 8% moisture or less. The stenter frame is recommended to provide the desired fabric dimensions and to avoid creases, that would be set in the fabric during the curing operation.

3. Curing:

I. Dried fabrics can be cured in the stenter or in the fixation oven:

150°C – 90 seconds

160°C – 60 seconds

170°C – 45 seconds

II. Curing can be done in one step of drying and fixation in the hot flue machine:

Dry and cure for 3 – 4 minutes at 150°C.

III.There is a possibility for high speed, one step drying and curing at higher

temperatures, but it is not possible to give full details here since curing

requirements vary with the type of fabric being processed and the efficiency of

heat transfer in the curing equipment.

4. Washing:

This step is optional though it should be done for optimum results. The first washing is alkaline in order to neutralize the acidity developed by the catalyst thus avoiding formaldehyde odours. The washing is followed by a final drying done on the stenter frame.

Suggested finishing formulations:

The amount of the catalyst Magnesium chloride should be 25 – 30% on the quantity of AVCO-REZ ZFF.

Adding AVCO-SOFT PE to the finishing recipe will minimize fabrics strength loss in the curing process.

I. Woven cotton fabrics:

AVCO-REZ ZFF 30 – 60 g/l

Magnezium Chloride 10 – 18 g/l

AVCO-SOFT PE 20 – 40 g/l

AVCO-SUPERFINISH SNI 30 – 50 g/l

Acetic acid (60%) app. 0.2 cc/l (adjust to pH 4.5 – 5)

II. Rayon filament fabrics:

AVCO-REZ ZFF 50 – 100 g/l

Magnezium Chloride 15 – 30 g/l

AVCO-SOFT PE 25 – 50 g/l

AVCO-SOFT NIC 20 – 30 g/l

AVCO-ELASTOGUM 100 15 – 25 g/l

III. Crease-resist finish to improve the dimensional stability of cotton knits:

AVCO-REZ ZFF 40 – 90 g/l

Magnezium Chloride 12 – 23 g/l

AVCO-ELASTOGUM MEC 10 – 20 g/l

AVCO-BIOSOFT BS 20 – 30 g/l

IV. Calandered finishes:

The quality of embossed and chintz finished fabrics is greatly influenced by the residual moisture content of the fabric.

The padded fabric is dried to residual moisture level of:

Cotton 6 – 10 %

Rayon staple 8 – 14 %

Calandering is then done at 160 – 200°C at pressure of 30 – 40 ton and followed by hot curing.

REMARKS:

Ensure the fabric is well prepared and neutralised prior to the application. The curing conditions (time/temperature), the amount of catalyst and the pH should be carefully adjusted according to the recommended recipes, in order to produce a complete cross-linking effect, and to avoid the risk of bad odours on the treated fabrics.