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1. Product Overview
Polyether polyol refers to a class of compounds generated by polymerization of epoxy compounds (such as propylene oxide or ethylene oxide) and initiators (such as polyols, polyamines or water). It is an important chemical raw material and is widely used in the production of polyurethane (PU) materials, including soft foams, hard foams, elastomers, adhesives, coatings and other fields.
2. Main production process
2.1. Raw materials
- Epoxy compounds:
- Propylene oxide (PO)
- Ethylene oxide (EO)
- Initiator:
- Glycerol
- Triethanolamine
- Sorbitol
- Sucrose
- Polyamide
2.2. Process flow
- Initiator treatment: Mix the initiator with the catalyst and remove moisture and impurities by heating.
- Epoxidation polymerization: Add propylene oxide or ethylene oxide gradually to the initiator to cause a ring-opening polymerization reaction to generate polyether polyols.
- Post-treatment: Neutralize the reaction product, remove the catalyst and light components, and finally obtain the target product.
- Quality control: Ensure that the product meets the specifications through testing of viscosity, hydroxyl value, acid value and other indicators.
3. Classification and characteristics
3.1. Classification by use
- Polyether for soft foam:
Low molecular weight, suitable for the production of flexible foam materials, such as mattresses, sofas, car seats, etc. - Polyether for hard foam:
High molecular weight, mainly used to make insulation boards, refrigerator insulation materials and building insulation materials. - Polyether for elastomer:
High strength, good elasticity, often used in soles, seals, etc. - Functional polyether:
Contains special functional groups, such as flame retardant and antistatic polyether, used for special purposes.
3.2. Classification by structure
- Linear polyether polyol:
Regular molecular chain structure and stable performance. - Branched polyether polyol:
Contains branched structure, with high viscosity and mechanical strength. - Block copolymer polyether:
It is formed by alternating polymerization of EO and PO, and has the flexibility to adjust performance.
4. Product performance indicators
4.1. Main indicators
- Hydroxy value (mg KOH/g):
Measures the activity of the product. The higher the hydroxyl value, the stronger the reactivity. - Molecular weight (g/mol):
Affects the physical properties of the product, such as strength, hardness, etc. - Viscosity (mPa·s):
Affects processing performance and fluidity. - Acid value (mg KOH/g):
Reflects the purity of the product. The lower the acid value, the purer the product. - Moisture content (%):
High moisture content will affect the foaming reaction and foam quality.
4.2. Performance characteristics
- Excellent processing performance: Easy to react with isocyanate to form polyurethane.
- Good mechanical properties: The hardness of the product is adjustable and the elasticity is good.
- Wide adaptability: Applicable to a variety of catalysts and formulas.
- Environmental protection: Low VOC and chlorine-free formulas can be selected to meet green environmental protection requirements.
5. Application areas
5.1. Soft polyurethane foam
Used in furniture, mattresses, car seats, packaging materials, with softness, elasticity and durability.
5.2. Rigid polyurethane foam
Widely used in building insulation, cold storage, cold chain logistics and home appliance insulation.
5.3. Polyurethane elastomer
Used in soles, tires, seals, conveyor belts, etc., with high strength and high elasticity.
5.4. Adhesives and coatings
As the base material of adhesives and coatings, it gives the product excellent adhesion and chemical resistance.
5.5. Others
Used in industrial fields such as lubricants, dispersants, and antistatic agents.
6. Market and development trends
6.1. Market demand
- The wide application of polyurethane materials in furniture, construction, and automotive industries has driven the market growth of polyether polyols.
- With the increasing global demand for low-carbon and environmentally friendly materials, the application prospects of bio-based and degradable polyethers are broad.
6.2. Technological innovation
- Renewable raw materials: Develop polyether polyols based on vegetable oils or waste.
- Low VOC technology: Reduce the emission of volatile organic compounds and meet environmental protection requirements.
- High performance: Optimize molecular structure and enhance heat resistance, wear resistance and other properties.
7. Product advantages and competitiveness
- Flexible product design: By regulating the molecular structure, it can meet the diverse needs of different fields.
- Outstanding environmental performance: Some products achieve zero emission or renewable raw material production.
- Mature industrial chain support: Large-scale production capacity and technological advantages ensure stable supply.
8. Precautions for use
- Storage requirements: Store in a cool, dry and ventilated environment, avoid direct sunlight and high temperature.
- Safe operation: Avoid contact with acidic or strong oxidizing substances, and wear protective equipment during operation.
- Transportation precautions: Comply with hazardous chemical transportation regulations to prevent leakage or environmental pollution.
9. Conclusion
Polyether polyols have become an important basic raw material for modern industry due to their versatility and wide application fields. In the future, with the advancement of technology and the improvement of environmental protection requirements, polyether polyols will play a greater role in the direction of greening, high performance and sustainable development, bringing more innovative solutions to various industries.