Plastics are valued for their versatility, durability and ease of processing, but their performance can be affected by factors such as sunlight, heat, static charge and processing conditions. This is where Additive Masterbatches play an important role. They allow manufacturers to introduce specific functional properties into polymers while maintaining controlled and consistent processing.
Functional additives can help plastics withstand UV exposure, improve melt flow, reduce processing defects, enhance dimensional stability and address other performance requirements. The right additive depends on the polymer, manufacturing process and intended end use.
A plastic product is not judged only by its appearance. Its performance during processing and throughout its service life also matters. For example, a plastic product used outdoors may need protection from UV radiation, while a film manufacturer may need better processing behaviour and fewer surface defects.
Kandui's range covers several functional requirements, including UV stabilisation, processing improvement, nucleation, antistatic performance, anti-yellowing, impact modification and other specialised applications. The company's additive range focuses on dispersing active ingredients effectively so that the desired properties can be achieved at optimum loading levels.
This makes functional additives useful across applications such as films, pipes, packaging, fibres, household products, moulded components and other plastic products.
Exposure to sunlight can affect polymers over time. UV radiation can contribute to photodegradation, which may result in colour changes, cracking, chalking and deterioration of physical properties. UV stabilisers are therefore important for plastic products that are exposed to sunlight.
Kandui offers UV Stabilizer Masterbatches designed around different application requirements. They identify two major categories of UV stabilisers: ultraviolet absorbers and hindered amine light stabilisers (HALS). The selection depends on factors such as exposure conditions, product thickness, expected service life and other ingredients used in the formulation.
Applications mentioned by Kandui include PP and HDPE raffia, pipes, nets, films, mulch films and PP fibres and filaments. This shows why UV protection should be considered according to the actual environment and end-use conditions rather than treated as a one-size-fits-all requirement.
Plastic processing involves controlling the behaviour of molten polymer as it moves through equipment. Processing problems can affect productivity as well as the appearance and quality of the finished product.
Polymer Processing Aid Masterbatches are designed to improve processability in applications such as pipes, tubes and polyethylene films. Kandui states that these processing aids can reduce die build-up and melt fracture while helping improve throughput and product quality.
The page also highlights several process-related benefits:
By creating a smoother interface between the molten polymer and metal surfaces in processing equipment, processing aids can support more consistent extrusion. They can therefore be particularly relevant where manufacturers are looking to improve processing stability without compromising the required product characteristics.
Some functional additives work by influencing how a polymer behaves as it cools and crystallises. This is particularly relevant for polypropylene applications.
Nucleating Masterbatches are used to improve properties such as dimensional stability and optical performance. Kandui notes benefits including cycle-time reduction, improved warpage and dimensional control, improved aesthetics, higher heat distortion temperature, and increased stiffness and crystallinity.
Faster crystallisation can also support productivity by reducing moulding cycle times and improving the efficiency of extrusion processes. For manufacturers, this means an additive can influence not only the final characteristics of a plastic product but also how efficiently it can be manufactured.
Melt Flow Index (MFI), also referred to as Melt Flow Rate (MFR), is an important measure of how easily a polymer flows when molten under specified conditions. It is particularly relevant when evaluating materials for processes such as injection moulding, extrusion and blow moulding.
MFI Modifier Masterbatches are designed to modify the MFI of polyolefins, particularly polypropylene and polyethylene. This can help manufacturers achieve a melt-flow level suited to the requirements of a particular application and manufacturing process.
This type of functional modification is useful when process requirements call for greater control over how a polymer flows during manufacturing.
Not every functional requirement is related to mechanical performance or processing. Some additives address appearance, handling and surface behaviour.
For example, Antistatic Masterbatches are used to reduce the problems associated with static charge accumulation. Static electricity can attract dust, cause thin plastic items to stick together and create concerns when plastic packaging is used around certain materials or electronic products.
Other solutions in Kandui's range include optical brighteners, anti-yellowing masterbatches, impact modifiers, anti-fog solutions, high-gloss masterbatches and odour neutralisers. They also list specialised options such as thermochromic, perfume, laser-marking and effect masterbatches.
For PET applications, Kandui's anti-yellowing masterbatches are designed to address yellowing associated with recycled PET and repeated thermal processing, helping maintain brightness, transparency and appearance.
The most suitable additive is determined by more than the desired end property. Manufacturers need to consider the polymer, processing method, product design, exposure conditions and other additives being used.
Important considerations include:
A well-designed formulation therefore starts with understanding the complete application rather than selecting an additive based on one property alone.
Functional additives have become an important part of modern plastics manufacturing because they can address specific challenges without changing the fundamental purpose of the polymer. From protecting outdoor products against UV-related degradation to improving melt flow, reducing processing defects and controlling crystallisation, each additive serves a particular role.
For manufacturers looking for a broad and application-focused range, Additive Masterbatches from Kandui offer solutions across multiple functional requirements. With its range of additive products and focus on active-ingredient dispersion, Kandui can be considered the best option to opt for when manufacturers need functional masterbatch solutions suited to specific plastic applications.
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