Light-shielding coating process and summary
1. Foreword
PU coating technology is a new fabric finishing technology that has developed in China in recent years. Use PU coating glue on the fabric to apply scraping coating on one side or both sides. After baking and solidification. A continuous high polymer resin film is formed on the surface of the fabric. To cover the PU coating, multiple layers of resin mixed with color paste are scraped onto the surface of the fabric to make it completely impermeable, thus achieving a complete covering effect.
2. Required samples and equipment
1. Sample
1.1 BASFPU coating additives:
LuLe coated with CCG/CCM/CCT (CCG is the finished base coating slurry, CCM is the finished coating slurry, and CCT is the finished top coating slurry).
Degu SN-S (chelating dispersant)
1.2 Other additives:
Ammonium stearate (foam stabilizer)
Diammonium hydrogen phosphate (viscosity reducing)
Ammonia water (adjusting pH value, helping to dissolve ammonium stearate)
2. Equipment: PU coating machine (oven length 25m), foaming machine (homemade), mixer
3. Base fabric sample: TC cloth, about 60 meters
3. Sample process
1. Overall process: semi-finished product is coated with primer, dried, coated with middle slurry, dried, coated with top slurry, baked and cross-linked finished product
Drying temperature:
Drying oven No. 1 oven No. 2 oven No. 3 oven The 4th oven and the 5th oven
Temperature 80℃ 90℃ 100℃ 110℃ 120℃
Baking temperature: 150–160℃, 2.5min
Vehicle speed: 15 m/min
2. Slurry blending:
Slurry blending process: Add the finished slurry and stir à add diammonium hydrogen phosphate à add ammonium stearate à add SN-S à add ammonia
Formula:
Roulette 50kg
Ammonium stearate 150g (dissolve to 30% concentration before adding, you can add ammonia to dissolve)
Diammonium hydrogen phosphate 100g (dissolve to 25% concentration before adding)
Appropriate amount of ammonia (adjust pH = 9)
IV. Problems encountered and summary
1. The foaming machine is a self-made manual product with unstable performance and unsatisfactory foaming quality. It wastes a lot of pulp and takes time to clean. It needs to be improved, that is, adding a valve at the foam outlet to adjust the flow, increase the foaming intensity, and improve the foaming quality. Suggest they buy a new automatic foaming machine.
2. After drying, a roller is needed. The roller is too small and the rolling force is not enough. It is recommended that the roll surface be treated with Teflome.
3． The volume on the PU coated knife is too small and the foam capacity is not enough.
4． Ammonium stearate is difficult to dissolve and it takes a certain amount of time to stir the slurry.
5． The overall effect is quite satisfactory to the naked eye.
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Extendedreading:https://www.alltextile.cn/product/product-67-229.html
