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2025
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Application Summary of Silica Opening Agent in PET/PP/PE Plastic Films
With the evolution of consumption habits and technological innovation, the market has imposed stricter requirements on film performance (e.g., transparency, matte finish, food safety) and production efficiency, driving the industry toward high efficiency and environmental friendliness.
I. Background of Opening Agents and Plastic Films
1. Definition and Development of Opening Agents
Opening agents, also known as slip agents or anti-blocking agents, are used to improve the opening performance of plastic films. Their development has gone through three stages:
Early stage: Inorganic types (e.g., talc powder, diatomaceous earth)
Middle stage: Organic types (e.g., oleamide, erucamide)
Current stage: Synthetic silicon dioxide-based types (with growing application scope)
2. Application and Demand of PET/PP/PE Plastic Films
PET, PP, and PE plastic films are widely used in fields such as food packaging, refrigerated preservation, express packaging, and electronic product packaging, serving as a key component of modern packaging.
With the evolution of consumption habits and technological innovation, the market has imposed stricter requirements on film performance (e.g., transparency, matte finish, food safety) and production efficiency, driving the industry toward high efficiency and environmental friendliness.
II. Challenges Faced by the Plastic Film Industry
1. Production-Side Issues
During production or long-term storage, low-molecular-weight substances on the surface of PP, PE, and PET plastic films tend to exude and entangle with each other, leading to film blocking. This further causes problems such as film winding and screen clogging in production, which not only reduces production efficiency but also impairs subsequent processing quality.
The root cause lies in the strong intermolecular forces of polymer macromolecules, which make film layers prone to "blocking."
2. Consumer-Side Demands
When purchasing packaged goods and fresh packaged food, consumers pay high attention to film quality indicators such as transparency, optical properties, and food safety—these are key factors influencing purchasing decisions.
III. Application Characteristics of Silica Opening Agents
1. Performance Advantages
Improved yellowing resistance and processing convenience: Its porous structure can adsorb metal ions (e.g., iron ions), reducing oxidative yellowing and alleviating "terminal yellowing." With high bulk density, it mixes easily with resins for convenient processing and can be made into masterbatch with a concentration of over 20%.
Safety and application optimization: It is 100% synthetic amorphous silicon dioxide, free of silicon crystals (no "silicosis" risk) and organic substances, and has obtained FDA certification for high safety. After addition, it reduces the dosage of amide-based slip agents while still achieving excellent opening effects, significantly lowering static/dynamic friction and having little impact on film haze to maintain high transparency.
2. Current Industry Supply Status
Silica opening agents have strict requirements for purity, metal element content, particle size, and microscopic shape. In the past, they were mainly supplied by overseas chemical giants, but problems such as high prices, long and unstable lead times restricted the development of the domestic film industry.
Meanwhile, stricter environmental regulations have limited the use of low-cost raw materials containing heavy metals, leading to an urgent demand for cost-effective domestic raw materials among downstream domestic chemical enterprises. The domestic substitution of high-end nano-silicon dioxide products needs further promotion.
IV. Film Opening Technology Solutions and Domestic Breakthroughs
1. Technical Principle
The introduction of inorganic silica opening agents creates a microscopic "rough" structure on the surface of polymer films. This disrupts intermolecular forces, reduces the "blocking" tendency between film layers, and promotes film layer separation, thereby solving the blocking problem.
2. Achievements of Domestic Enterprises
As the first domestic supplier of plastic film opening agents, ZHONGLIAN-CHEM has successfully developed silica opening agents by researching the pore volume and pore size structure of silica, optimizing surface modification technology, and improving precipitation and gel synthesis processes.
This product effectively solves the blocking problem of plastic films, performs excellently in multiple systems such as PP, PE, and PET, and enhances the diversified application potential of products. It provides a competitive solution for the domestic plastic film industry and breaks the monopoly of overseas enterprises in the global high-end nano-new material market.
The news and information released by Zhonglian Chemical is provided solely for informational purposes and is intended only for reference and communication among industry professionals. It does not guarantee the accuracy and completeness of such information. You should not use this information to replace your own independent judgment; therefore, you shall bear the risks arising from any use of the information, and Zhonglian Chemical shall not be held liable. In case of any infringement, please contact us for removal.
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