Views: 88 Author: Site Editor Publish Time: 2026-06-01 Origin: Site
Anti-hydrolysis agents are widely used to improve the long-term stability of moisture-sensitive polymers such as PET, TPU, PU, PLA, PBAT, PBT, and other ester- or urethane-containing materials. However, choosing the right chemistry is only one part of the decision. In real production, the physical form of the additive — powder, liquid, or masterbatch — can strongly affect feeding accuracy, dispersion, compatibility, processing stability, and final product performance.
For manufacturers and compounders, the best anti-hydrolysis solution is not always the one with the highest active content. A powder form may offer flexibility during formulation development, a liquid form may be easier to use in polyurethane or coating systems, and a masterbatch may be more practical for extrusion, film, monofilament, or injection molding production. This article explains how to compare powder, liquid, and masterbatch anti-hydrolysis agents and how to choose the right form for different polymer systems and processing conditions.
● Powder, liquid, and masterbatch Anti-Hydrolysis Agents can be based on similar carbodiimide chemistry but serve very different industrial processing needs.
● Powder Anti-Hydrolysis Agents are often selected for formulation flexibility, precise dosage control, and broad adaptability across TPU, PET, PLA, PBAT, PU, and polyester polyol systems.
● Liquid Anti-Hydrolysis Agents are commonly used in polyurethane systems, coatings, adhesives, emulsions, and other compatible liquid formulations.
● Masterbatch Anti-Hydrolysis Agents are widely preferred in PET film, BOPET film, PET monofilament, PET injection molding, and other thermoplastic extrusion processes.
● The best choice of Anti-Hydrolysis Agents depends on polymer type, process temperature, feeding method, dispersion requirements, moisture control, and long-term aging targets.
● Production trials and accelerated aging tests are necessary before finalizing the form and dosage of Anti-Hydrolysis Agents.
The performance of Anti-Hydrolysis Agents is not determined only by active carbodiimide content. In real production, the physical form affects feeding accuracy, dispersion, handling loss, dust generation, and compatibility with the surrounding polymer or formulation.
Identical carbodiimide chemistry may show different plant performance when supplied as powder, liquid, or masterbatch. The reason is that each form enters the process differently and responds differently to mixing, moisture, dosing systems, and continuous line conditions.
For PET, TPU, and PLA/PBAT, hydrolysis resistance depends on how effectively Anti-Hydrolysis Agents contact carboxyl end groups during processing. In continuous manufacturing, this directly affects property retention, appearance control, and long-term aging reliability.
The most practical way to compare Anti-Hydrolysis Agents is to evaluate how each form matches a specific production route. Powder offers formulation flexibility, liquid supports easy incorporation into reactive systems, and masterbatch improves feeding and handling in thermoplastic lines.
A high-purity powder may be ideal in development work but less suitable on a line without accurate powder dosing. A liquid additive may integrate smoothly in PU systems, while a masterbatch may be more efficient for PET film or injection molding.
Form | Representative Type | Typical Systems | Main Strengths | Main Process Focus |
Powder Anti-Hydrolysis Agents | Bio-SAH™ 362 | TPU, PU, PET, PLA, PBAT, polyester polyol, adhesives | High purity, flexible dosage, broad formulation adaptability | Dust control, dry blending, feeding precision, moisture protection |
Liquid Anti-Hydrolysis Agents | Bio-SAH™ 342 Liquid | PU synthetic leather slurry, CPU casting, adhesives, PLA/PBAT, polyol systems | Easy addition, good dispersibility, low odor, low migration | Compatibility, viscosity, mixing sequence, storage stability |
Masterbatch Anti-Hydrolysis Agents | Bio-SAH™ MPET 3613 | PET film, BOPET, PET monofilament, PET injection molding | Easy feeding, reduced dust, better handling, uniform incorporation | Carrier compatibility, let-down ratio, drying, final dosage control |
Powder Anti-Hydrolysis Agents are often selected when formulation teams need direct control over dosage and resin adaptation. This makes them suitable for TPU compounds, PET or PBT modification, PLA/PBAT blends, polyester polyols, and adhesives.
Bio-SAH™ 362 is a monomeric carbodiimide with at least 99% purity and a melting point of 50–53°C. Typical addition levels include 0.2–0.5 phr in TPU, about 1 phr in polyester polyol for PU, 0.8–3 phr in PET monofilament, 0.5–2.0 phr in PLA, and 0.8–1.5 phr in adhesives.
Powder Anti-Hydrolysis Agents require accurate feeding, dry storage, and uniform premixing. Their performance can be affected by moisture, poor dispersion, and interactions with fillers, pigments, or other additives.
Liquid Anti-Hydrolysis Agents are commonly used when direct liquid-phase addition is more practical than dry blending. They fit polyester polyols, PU coatings, PU synthetic leather slurry, CPU casting, adhesives, and some PLA/PBAT systems.
Liquid carbodiimide Anti-Hydrolysis Agents react with terminal carboxyl groups to form stable N-acylurea structures and slow hydrolysis autocatalytic reactions. They can also help reduce acid value growth, improve molecular weight retention, and support long-term heat and humidity stability.
Bio-SAH™ 342 Liquid is a polymeric carbodiimide with moderate viscosity and good compatibility in suitable liquid systems. Typical dosage is about 1.0 phr in PU slurry polyol, 1.0–2.5 phr in CPU prepolymer, 1.0–2.0 phr in adhesives, and 0.5–2.0 phr in PLA/PBAT formulations.
Masterbatch Anti-Hydrolysis Agents are designed for processors that want cleaner handling and easier metering. In extrusion and injection molding, they often improve dosing consistency compared with direct low-rate powder addition.
Bio-SAH™ MPET 3613 is a PET-based anti-hydrolysis masterbatch with at least 13.5% active anti-hydrolysis content. It is mainly used in PET film, BO-PET film, PET monofilament, and PET injection molded parts.
Typical addition levels include 5%–10% in PET industrial rubber filament, 2%–5% in PET film, and around 8% in PET injection molding. Before scale-up, the processor should review carrier compatibility, let-down ratio, and drying conditions.
PET and PBT are often processed in continuous thermoplastic lines, so masterbatch Anti-Hydrolysis Agents are commonly used for film, sheet, monofilament, and molded parts. Powder Anti-Hydrolysis Agents also remain useful in specialty modification and compounding.
For TPU and PU, both powder and liquid Anti-Hydrolysis Agents can be suitable depending on the process route. Powder is often used in compounding and formulation development, while liquid grades are more suitable for polyester polyols, PU coatings, synthetic leather slurry, CPU casting, and adhesives.
PLA and PBAT require a balanced evaluation because hydrolysis resistance must be improved without sacrificing application performance too early. Powder, liquid, and polymeric Anti-Hydrolysis Agents can all be considered according to process stability, acid value control, and service-life needs.
Polymer | More Common Starting Form | Typical Recorded Direction |
PET / PBT | Masterbatch or powder | Film, monofilament, molding, modification |
TPU / PU | Powder or liquid | Compounding, polyol systems, casting, adhesives |
PLA / PBAT | Powder, liquid, or polymeric additive | Hydrolysis resistance with processability balance |
Polyester polyol | Liquid or powder | Direct incorporation into liquid systems |
Adhesives / PU slurry | Liquid | Easy addition and even mixing |
A frequent mistake is selecting Anti-Hydrolysis Agents only by purity or active group level. In practice, feeding method, dispersion quality, and process compatibility often determine whether the additive performs well on the plant floor.
Anti-Hydrolysis Agents cannot fully compensate for poor resin drying or uncontrolled moisture. If PET, TPU, or PLA/PBAT contains excess residual moisture, hydrolysis may proceed rapidly during processing before the stabilizer can act effectively.
In transparent film, monofilament, coatings, and synthetic leather, the additive form can affect clarity, color tone, surface quality, and dispersion uniformity. Evaluation should therefore include both property retention and final product appearance.
Validation should begin with a blank control and then compare powder, liquid, or masterbatch Anti-Hydrolysis Agents under realistic process conditions. A dosage ladder is usually more informative than a single concentration because performance gains are not always linear.
In PET and PBT, validation often includes IV retention, melt viscosity behavior, and performance after hot water or humid heat aging. In TPU, PU, and PLA/PBAT, the review may include tensile retention, tear strength, melt index change, process continuity, and hydrolysis stability.
Production validation should also compare line cleanliness, dust generation, metering stability, storage handling, and rework rate. Anti-Hydrolysis Agents need to fit both the target performance standard and the realities of commercial manufacturing.
When formulation flexibility is the first priority, powder Anti-Hydrolysis Agents are often the best starting point. When the system is liquid-based, such as polyols, adhesives, emulsions, or coatings, liquid Anti-Hydrolysis Agents are usually easier to integrate.
If the process is centered on PET film, monofilament, or injection molding, masterbatch Anti-Hydrolysis Agents are often the more practical option. They support cleaner handling and more stable addition in continuous thermoplastic operations.
For mixed modification materials or higher-temperature applications, polymeric carbodiimide Anti-Hydrolysis Agents such as Bio-SAH™ 372N may also be considered. These grades are relevant for TPU, PET, PBT, PBAT, PLA, PHA, PBS, PTT, and PA where migration resistance and long-lasting protection are important.
The choice of powder, liquid, or masterbatch Anti-Hydrolysis Agents depends on both chemistry and processing requirements. Powder Anti-Hydrolysis Agents are suitable for flexible dosage and formulation work, liquid Anti-Hydrolysis Agents fit polyurethane, polyester polyol, adhesive, and coating systems, while masterbatch Anti-Hydrolysis Agents are often more practical for PET film, BOPET, monofilament, and injection molding. For PET, TPU, and PLA/PBAT, the final selection should be based on polymer type, processing route, compatibility, moisture control, and aging targets, with pilot trials and aging tests completed before scale-up. Suzhou Ke Sheng Tong New Materials Technology Co., Ltd. offers carbodiimide-based Anti-Hydrolysis Agents in powder, liquid, polymeric, and masterbatch forms for these application needs.
What is the main difference between powder, liquid, and masterbatch anti-hydrolysis agents?
The main difference is how they are handled and incorporated into the polymer system. Powder forms offer flexible dosage control, liquid forms are easier to mix into compatible liquid systems, and masterbatch forms are more convenient for thermoplastic processing.
When should I choose a powder anti-hydrolysis agent?
Powder is often suitable for formulation development, compounding, and applications where the manufacturer needs flexible dosage adjustment or high active content.
When is a liquid anti-hydrolysis agent more suitable?
Liquid anti-hydrolysis agents are often considered for PU systems, coatings, adhesives, sealants, and other formulations where liquid mixing is more practical.
Why is masterbatch often used in extrusion or injection molding?
Masterbatch is easier to feed, reduces dust, and can improve dispersion consistency when the carrier resin is compatible with the base polymer.
Can one anti-hydrolysis agent form be used for all polymers?
Not always. PET, TPU, PLA, PBAT, PU, PA, and PC have different processing temperatures, compatibility requirements, and hydrolysis risks, so the form should be selected case by case.
How should I test whether the selected form is effective?
Use production-relevant trials and compare aged and unaged performance, including tensile strength, elongation, IV, melt viscosity, appearance, and humid heat aging results.
