Accelerate and optimize processes with masterbatches
Additive masterbatch is a critical part in the crosslinking process of polyolefins containing silicone-based groups, which are commonly used in various applications, especially wire and cable production and piping. The main function of an additive masterbatch is to increase the efficiency and performance of crosslinking of polyolefins in combination with suitable catalysts. In this article, we will review the composition, advantages and applications of additive masterbatch, as well as the various methods of production and use of this essential material in the polymer industry.
Additive masterbatch components
To understand how a masterbatch works, it is best to familiarize yourself with its structure. A typical catalyst masterbatch consists of two main components:
- Bronsted acid and/or Bronsted acid anhydride (A)
- Polyolefin (B) containing Bronsted acid anhydride and/or Bronsted acid groups
These two components work together to improve the crosslinking efficiency of polyolefins while preventing or significantly reducing the release of Bronsted acid and/or sulfonic acid anhydride. Bronsted acid anhydride groups can be introduced into the polymer through a copolymerization process or grafting.
Bronsted acid and/or Bronsted acid anhydride (A)
The amount of Bronsted acid and/or Bronsted acid anhydride (A) present in the catalyst masterbatch is typically between 0.5 and 20.0 wt.% based on the total weight of the masterbatch. The optimum concentration of this component depends on the specific crosslinking application and the desired process efficiency.
Polyolefin (B) containing Bronsted acid and/or Bronsted acid anhydride groups
The polyolefin component (B) of the catalyst masterbatch contains Bronsted acid anhydride and/or Bronsted acid groups covalently bonded to the polymer. This component constitutes at least 5% by weight of the total weight of the masterbatch, with concentrations up to 99% by weight depending on the specific application and requirements. The most common polyolefins in this field are ethylene and propylene polymers.
Advantages of additive masterbatch
The use of catalysts in the crosslinking of polyolefins has several significant advantages, including:
- Improved crosslinking efficiency: The main advantage of using additive masterbatch is the increased crosslinking efficiency, which results in higher crosslinking degrees and reduced bonding time requirements.
- Cost-effectiveness: Using a masterbatch allows for the use of smaller amounts of silanol-dense catalyst, which can result in cost savings for manufacturers.
- Reduced leaching: Incorporation of Brønsted acid anhydride and/or Brønsted acid anhydride groups into the catalyst masterbatch helps reduce leaching of these components, thereby minimizing the risk of catalyst loss and the formation of sticky pellets.
- Increased safety and health: By reducing the release of corrosive substances, additive masterbatch minimizes common safety and health concerns associated with handling these substances. This reduces the need for protective clothing and acid-resistant equipment.
- Improved long-term aging performance: Specific catalyst masterbatches, such as CT/5, are designed to increase UV/VIS and aging resistance.
- Wide range of applications: The versatility of the additive masterbatch allows it to be used in a wide range of applications, including wire and cable production, piping, and other polymer-based products.
Additive masterbatch applications
Masterbatches are mainly used in the production of the following materials:
Wire and cable production
Crosslinking of polyolefins is a critical process in the production of wire and cable insulation materials. The use of masterbatches in this field, the manufacture of insulation materials, leads to the production of high-quality products, improved crosslinking efficiency and long-term performance, and enhanced wear resistance.
Plumbing
Catalyst masterbatch is also used in the crosslinking of polyolefins to produce multilayer pipes. The improved crosslinking efficiency of this material helps in producing high quality pipes with high mechanical and chemical resistance properties.
Methods for producing additive masterbatches: copolymerization and grafting
There are two main methods for introducing Bronsted acid and/or Bronsted acid anhydride groups into the polymer components of a catalyst masterbatch: copolymerization and grafting.
Copolymerization
Copolymerization involves the use of unsaturated carboxylic acids or their derivatives as comonomers in the polymerization process. This method results in the formation of a polymer containing Brønsted acid anhydride groups and/or Brønsted acid anhydride groups that are covalently attached to the polymer backbone.
To graft
On the other hand, grafting involves the chemical attachment of Brønsted acid anhydride groups and/or Brønsted acid anhydride groups to the polymer backbone of the existing materials. This process can be carried out using various grafting agents, such as unsaturated carboxylic acids or their derivatives (such as anhydrides, esters, and salts). Grafting can be carried out in a heated extruder or mixer with or without the presence of a radical initiator.
Conclusion
Additive masterbatch plays an important role in crosslinking polyolefins containing silicone-based groups. It increases efficiency and performance in the production of various materials, especially wire and cable and piping. Catalyst masterbatch is an essential component in the polymer industry with numerous advantages, including cost-effectiveness, increased safety and health, and a wide range of applications.
Behin Pardazan Koosha has several additive masterbatches production units ready to provide products to manufacturers in various industries. For more information about the product, please contact our experts.