According to the technical data of Guoli Chemical, the core advantages of polypropylene glycol PPG-400 compared with similar products are its outstanding chemical stability, safety and mildness, and compatibility with a variety of materials. It is a balanced industrial-grade nonionic surfactant and synthesis intermediate.
Compared with lower or higher molecular weight polypropylene glycols (such as PPG-200, PPG-600, PPG-1000, etc.), PPG-400 achieves an ideal balance in several key properties, making it extremely versatile. The following is a detailed analysis for you:
### 1. Balanced performance
PPG-400 has a moderate molecular weight, which enables it to combine the high reactivity of low molecular weight products with the flexibility and lubricity of high molecular weight products.
| Property | PPG-400 Performance | Advantages Compared with Similar Products |
| :--- | :--- | :--- |
| **Reactivity** | High primary hydroxyl content, moderate reactivity | Compared with PPG-200, it provides better flexibility as a polyurethane soft segment; compared with PPG-600/1000, it has higher reactivity and is easier to react uniformly during synthesis. |
| **Lubrication and moisturizing** | Moderate viscosity index, stable viscosity-temperature characteristics | Lubrication and moisturizing properties are superior to low molecular weight PPG-200, while it is easier to operate and compound than high molecular weight PPG-600/1000, with a refreshing and non-sticky skin feel. |
| **Compatibility** | Excellent compatibility with a variety of organic solvents, resins and polymers | Compared with high molecular weight products, it has better solubility in water and polar solvents, and is more efficient as a solubilizer and cosolvent. |
### 2. Excellent chemical stability and system adaptability
The ether bond structure in the molecular chain of PPG-400 enables it to remain stable over a wide pH range.
- **Hydrolysis resistance**: Not prone to hydrolysis and failure, with better tolerance in acidic or alkaline systems than many ester surfactants.
- **Hard water resistance**: Maintains excellent surface activity in hard water, unaffected by calcium and magnesium ions, which is a significant advantage in industrial cleaning and textile auxiliaries.
### 3. Outstanding safety and mildness
Based on product safety technical data, PPG-400 performs excellently in safety, which is a key advantage for its entry into high-end personal care and pharmaceutical fields.
- **Low toxicity and low irritation**: Low acute oral toxicity (rat oral LD₅₀ > 2000 mg/kg), non-irritating to skin, only causes mild and transient eye irritation, non-sensitizing.
- **Application expansion**: This high level of safety enables its use not only in industrial fields but also in meeting strict requirements for cosmetics and pharmaceutical excipients (such as suppository bases, ointment bases), an advantage not shared by many industrial surfactants.
### Application suggestions
Based on the above advantages, PPG-400 performs particularly well in the following applications:
- **Polyurethane industry**: As a soft segment component, it provides ideal flexibility and hydrolysis resistance balance for adhesives, coatings, and elastomers. The recommended dosage should be calculated based on the specific formulation hydroxyl value and isocyanate index.
- **Personal care products**: Used as a **moisturizer and lubricant** in creams and facial cleansers to improve skin feel, recommended addition amount is 1%-5%.
- **Industrial auxiliaries**: As a core raw material for **defoamers and mold release agents**, leveraging its good spreadability and chemical stability. As an intermediate for synthetic ester lubricants, it provides excellent lubricity.
### Precautions
- PPG-400 is hygroscopic; please seal the container immediately after use and store in a cool, dry place.
- Despite its high safety, it is still recommended to wear protective gloves and goggles during industrial production operations to avoid unnecessary contact.
If you have a specific application scenario, such as requiring a specific viscosity or hydroxyl value range, you can provide more detailed requirements, and I will conduct further analysis for you.
