What factors affect the price of plastic antibacterial agents? Understand these five points before making purchasing decisions.
Plastic antibacterial agents are the core functional additives that give plastic products the ability to resist bacteria and mold. They are widely used in fields such as household appliances, automobiles, food packaging, medical devices, and daily necessities. During the procurement process, price is one of the important factors considered for the purchase decision. However, the price of plastic antibacterial agents is not a simple number - it ranges from several dozen yuan to several hundred yuan per kilogram, and the differences behind it involve multiple factors such as the antibacterial system, carrier technology, particle size process, compliance certification, and procurement scale.
Understanding these influencing factors can help the purchasing party establish a scientific cost assessment logic and avoid the purchasing mistake of "only looking at the unit price". Tian Shilandun has been deeply engaged in the field of polymer antibacterial modification, with its core being the independently developed silver-zinc composite sustained-release technology, providing efficient, safe, and compliant antibacterial solutions for plastic product enterprises.
01 Antibacterial system determines the basic cost
Cost differences of silver-based, zinc-based, and silver-zinc composite systems
The active ingredient system of plastic antibacterial agents is the primary factor affecting the price. Currently, the mainstream antibacterial systems in the market include:
Silver-based antibacterial agents: With silver ions as the core active ingredient, they have high sterilization efficiency and a wide antibacterial spectrum, but silver is a precious metal, and the raw material cost is high
Zinc-based antibacterial agents: With zinc ions as the core active ingredient, they are safe and have a relatively lower cost, suitable for scenarios with high transparency requirements
Silver-zinc composite antibacterial agents: The rapid sterilization of silver ions and the long-lasting inhibition of zinc ions work together, balancing both efficiency and longevity, but the development and preparation process of the composite system is more complex, and the cost is between the single systems
Dalian Tianwei adopts the silver-zinc composite antibacterial system, through the rapid sterilization of silver ions (sterilization rate of Escherichia coli and Staphylococcus aureus within 30 minutes ≥ 95%) and the long-lasting inhibition of zinc ions (antibacterial rate remains > 90% after 180 days), achieving broad-spectrum inhibition of over 650 types of bacteria, and achieving a balance between antibacterial efficacy and comprehensive cost.
Cost differences between organic and inorganic
Organic antibacterial agents (such as quaternary ammonium salts, isothiazolinone) have relatively lower production costs, but have poor heat resistance (usually below 200°C), and are not suitable for high-temperature plastic processing. Inorganic antibacterial agents (such as silver-based, zinc-based, and silver-zinc composite) have excellent heat resistance (decomposition temperature can reach above 500°C), but the preparation process is more complex, and the cost is relatively higher.
02 Carrier technology and particle size process affect quality premium
Selection of carrier materials
Inorganic antibacterial agents require carrier materials to load the active ingredients. Common carriers include zirconium phosphate, zeolite, glass powder, and silica. The preparation costs and performance of different carriers vary significantly:
Zirconium phosphate carrier: Layered structure is stable, has strong ion exchange ability, and excellent sustained-release performance, but the preparation process is complex and the cost is high
Zeolite carrier: The cost is relatively low, but its acid resistance and sustained-release performance are not as good as zirconium phosphate
Glass powder carrier: Good transparency, suitable for transparent products, but the release speed of antibacterial activity is difficult to control
Dalian Tianwei uses zirconium phosphate carrier to load silver-zinc ions, through microcapsule encapsulation technology to achieve gradient release of antibacterial components, with a 1000-hour degradation rate of ≤ 5% in an 85°C/85%RH high-humidity environment, and a protection period of up to 5-7 years.
Particle size control process
The particle size of the antibacterial agent directly affects its dispersion in the plastic substrate and the appearance of the product. The finer and narrower the particle size, the higher the preparation process requirements and the corresponding increase in cost. Nano-sized particle size (20-50 nanometers) can ensure that the antibacterial agent is uniformly dispersed in the plastic substrate, without generating white spots or blemishes, and does not affect the transparency and mechanical properties of the product. Tian Shilandun adopts a nano-sized dispersion process, with the particle size of the antibacterial agent controlled at 20-50 nanometers, suitable for injection molding, extrusion, blow molding, and spinning processes.
03 Compliance certification increases hidden costs
Food contact and environmental protection certification
If plastic antibacterial agents are used in scenarios such as food packaging, medical devices, and children's toys, they must comply with relevant compliance certifications, including:
GB 9685-2016 Food Contact Materials Standard
FDA Food Grade Testing
RoHS, REACH Environmental Regulations
ISO 22196, GB/T 31402 Antibacterial Performance Standards
The acquisition and maintenance of certifications require significant investment in testing costs and time. Antibacterial agent products with complete compliance qualifications usually have higher prices than uncertified products. Tian Shilandun products meet multiple certification standards. Inorganic metal ions do not leach out or migrate, and they can be safely used in food contact scenarios.
Industry Standard Compliance
Some industries have specific standards requirements for plastic antibacterial agents. For example, the home appliance industry refers to the GB/T 21551 series standards, and the automotive industry has exclusive antibacterial performance requirements for OEMs. Antibacterial agents that meet specific industry standards usually require additional testing and verification, resulting in increased costs.
