PA6, also known as nylon 6, is a semi-transparent or opaque milky white particle with thermoplasticity, light weight, good toughness, chemical resistance and durability, etc. It is generally used in automotive parts, mechanical parts, electronic and electrical products, engineering parts and other products.
In order to improve the mechanical properties of PA6, many manufacturers will modify PA6, such as adding a variety of modifiers, glass fibre is the most common additives, and sometimes in order to improve the impact resistance of synthetic rubber, such as EPDM and SBR. Due to the poor compatibility of glass fibre and nylon, so the surface of the product often appear floating fibre phenomenon.
The phenomenon of floating fibres in PA6 materials is mainly due to the following reasons:
1. Poor compatibility between glass fibre and nylon: in the process of plastic melt flow, due to the friction and shear force of the screw, nozzle, etc., it will destroy the interfacial layer on the surface of the glass fibre and reduce the bond between the glass fibre and the resin, and when the bonding is insufficient, the glass fibre will gradually accumulate on the surface to form the exposed floating fibre.
2. Specific gravity difference between glass fibre and resin: in the process of plastic melt flow, due to the difference in fluidity between glass fibre and resin, the mass density is different, so that the two have a tendency to separate, resulting in the glass fibre floating to the surface, the formation of floating fibre.
3. Fountain effect: When the plastic melt is injected into the mould, the fountain effect will be formed, and the glass fibre will flow from the inside to the outside, and the surface of the mould in contact with the cold will be frozen in an instant, and if it can’t be surrounded by the melt in time, it will be exposed to form floating fibre.
In order to solve the problem of floating fibres in PA6 materials, the following measures can be taken:
1. Improved moulding process conditions:
- Increase the filling speed to reduce the ratio of speed difference between glass fibre and plastic;
- Increase the mould temperature to reduce the contact resistance between glass fibre and mould, so that the middle molten layer becomes thicker when the plastic flows;
- Decrease the temperature of the metering section of the screw to reduce the amount of solvent, reducing the possibility of separation of plastic and glass fibre.
2. Material selection:
Choose nylon material with lower viscosity, or add a certain proportion of PA6 to increase the fluidity, and use special dyes to dye the glass fibre black (suitable for black nylon), or add bright additives such as silicone, modified amide polymers and so on, to improve the floating fibre situation.
3. Improve the compatibility between glass fibre and nylon:
Add additives such as compatibilizers, dispersants and lubricants to the moulded plastic materials.
SILIKE SILIMER 5140, Significantly improve the nylon floating fibre phenomenon.
SILIKE SILIMER 5140 is a polyester modified silicone additive with excellent thermal stability. It is used in thermoplastic products such as PE, PP, PVC, PMMA, PC, PBT, PA, PC/ABS, etc.
SILIKE SILIMER 5140, It can effectively improve the compatibility between glass fibre and resin, improve the processing lubricity; improve the uniformity of dispersed phase, reduce the separation of glass fibre and resin, so as to improve the phenomenon of nylon floating fibre.
Through customer feedback, SILIKE SILIMER 5140 has a very good effect on improving nylon floating fibre, after adding the right amount, it improves the processing performance and the surface quality of the products.
SILIKE SILIMER 5140 has a special structure with good compatibility with the matrix resin, no precipitation, no effect on the appearance and surface treatment of products. At the same time, different additions can achieve different effects, when added to the right proportion of the, it could Obviously improve the scratch-resistant and wear-resistant surface properties of products, improve the lubricity and mold release of the material processing process so that the product property is better.
If you are troubled by nylon floating fibre, please try SILIKE SILIMER 5140, I believe this processing aid will bring you a great surprise, it can not only solve the problem of nylon floating fibre, improve the surface quality of the products, but also improve the processing lubrication performance and improve the processing efficiency.
Contact us Tel: +86-28-83625089 or via email: amy.wang@silike.cn
Website: www.siliketech.com to learn more.
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