Application of low-odor reaction type 9727 in polyurethane foam
Introduction
Polyurethane foam (PU Foam) is a high-performance material widely used in the fields of architecture, furniture, automotive interiors, packaging materials, etc., and is highly favored for its excellent physical properties and processing technology. However, traditional polyurethane foams are often accompanied by strong release of volatile organic compounds (VOCs) during production and use, which not only pollutes the environment, but may also have adverse effects on human health. With the increase of environmental awareness and consumers’ pursuit of healthy life, the development of low-odor and low-VOC emission polyurethane foam has become an inevitable trend in the development of the industry.
In this context, low-odor reactive type 9727 came into being as a new type of polyurethane foaming additive. This product can not only effectively reduce the odor and VOC emissions in the production process of polyurethane foam, but also significantly improve the physical and processing properties of the foam, meeting the market’s dual needs for environmental protection and health. This article will introduce in detail the chemical structure, product parameters, application fields and specific applications in polyurethane foam of low-odor reaction type 9727, and conduct in-depth analysis in combination with relevant domestic and foreign literature to provide readers with comprehensive technical reference.
1. Chemical structure and characteristics of low-odor reaction type 9727
The low odor reaction type 9727 is a special additive based on the reaction of polyols and isocyanate. Its main components are modified polyols and catalysts. The chemical structure of the product is designed to reduce by-products generated during the reaction, thereby reducing VOC emissions and odor. Here are the main chemical properties of 9727:
- Molecular weight: about 500-1000 g/mol
- Statistics: 3-4
- Hydroxynumber: 300-400 mg KOH/g
- Density: 1.0-1.2 g/cm³
- Viscosity: 200-500 mPa·s (25°C)
- Flash Point:>100°C
- Solubilization: Soluble in most organic solvents, such as methane, dichloromethane, etc.
Table 1: Main Physical and Chemical Parameters of Low Odor Response Type 9727
| parameters | Value Range |
|---|---|
| Molecular Weight | 500-1000 g/mol |
| Stability | 3-4 |
| Hydroxynumber | 300-400 mg KOH/g |
| Density | 1.0-1.2 g/cm³ |
| Viscosity | 200-500 mPa·s (25°C) |
| Flashpoint | >100°C |
| Solution | Soluble in organic solvents |
2. Working principle of low-odor reaction type 9727
The main mechanism of action of the low-odor reactive type 9727 is to reduce VOC emissions and odor by optimizing the foaming process of polyurethane foam. Specifically, 9727 plays the following key roles in the polyurethane foaming process:
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Inhibit side reactions: The modified polyol in 9727 can quickly react with isocyanate at the beginning of the reaction to form a stable intermediate, avoiding the reaction of traditional polyols and isocyanate. By-products that are prone to occur, such as amines, aldehydes, etc., are often the main causes of odor and VOC emissions.
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Promote uniform foaming: 9727 contains special surfactants, which can effectively reduce the surface tension of the foam liquid phase, promote the uniform distribution of bubbles, and prevent the foam from collapsing or uneven holes. . This not only improves the mechanical properties of the foam, but also reduces VOC release caused by uneven foam.
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Adjust the curing rate: The catalyst component in 9727 can accurately control the curing rate of polyurethane foam, ensuring that the foam cures at the appropriate temperature and time, and avoiding too fast or too slow curing processes Effect on foam quality. At the same time, a reasonable curing rate will also help reduce unreacted raw material residues and further reduce VOC emissions.
3. Application fields of low-odor reaction type 9727
The low-odor reaction type 9727 is widely used in many fields due to its unique chemical structure and excellent performance, especially in industries with high environmental protection requirements. The following are the main application areas of 9727:
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Auto interior: Car seats, dashboards, door interiors and other components have strict requirements on the odor and VOC emissions of materials, especially high-end models pay more attention to the air quality in the car. The low-odor responsive 9727 can significantly reduce the odor of polyurethane foam, improve the comfort of the interior environment, and comply with international strict standards for automotive interior materials, such as VDA 278 in Germany and SAE J1756 in the United States.
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Home Products: Mattresses, sofas, pillows and other furniture products frequently come into contact with the human body, so they have high requirements for the safety and environmental protection of the materials. The application of 9727 can effectively reduce the release of harmful substances in polyurethane foam and protect the health of consumers. In addition, the 9727 can also improve the elasticity of the foam and extend the service life of the product.
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Building Insulation Materials: Polyurethane foam is a highly efficient insulation material and is widely used in building parts such as walls, roofs, and floors. The use of low-odor reaction type 9727 can not only reduce odor pollution during construction.��, it can also improve the insulation performance and durability of foam, and meet the standards and requirements of green buildings.
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Packaging Materials: Polyurethane foam has a wide range of uses in packaging in electronic products, precision instruments and other fields. The application of 9727 can reduce the release of VOC in packaging materials and avoid contamination of packaged items, especially in food and drug packaging.
4. Specific application of low-odor reactive 9727 in polyurethane foam
4.1 Application in automotive interior
The odor issue of automotive interior materials has always been the focus of attention of the automotive industry. Studies have shown that the VOC concentration in the air in the car is closely related to the health of drivers and passengers. Long-term exposure to high-concentration VOC environments may lead to headaches, fatigue, respiratory diseases and other problems. Therefore, countries have issued strict in-vehicle air quality standards, such as the European Directive on Air Quality in Passenger Cars and China’s GB/T 27630-2011 “Customer Car Air” Quality Assessment Guide.
The low-odor responsive 9727 has significant application effect in automotive interiors. According to a study conducted by the Fraunhofer Institute for Chemical Technology (ICT), polyurethane foam seats prepared using 9727 reduced VOC emissions in the VDA 278 test compared to conventional foam and showed in the odor test Better results. The study also pointed out that the addition of 9727 did not affect the mechanical properties of the foam, but instead improved the tear strength and rebound resistance of the foam.
Table 2: Effects of different additives on VOC emissions and odors of polyurethane foam
| Addant Type | VOC emissions (mg/m³) | Odor level (1-5) |
|---|---|---|
| No additives | 120 | 4 |
| Traditional additives | 80 | 3 |
| 9727 | 60 | 2 |
4.2 Applications in household goods
In the field of household goods, polyurethane foam is mainly used for filling materials for soft furniture such as mattresses, sofas, pillows, etc. These products have long contact with the human body, so they have strict requirements on the odor and VOC emissions of the materials. According to the “Polyurethane Foam for Furniture” standard issued by the China Building Materials Federation, the formaldehyde emission of polyurethane foam for furniture should not exceed 0.05 mg/m³, and the TVOC emission should not exceed 0.5 mg/m³.
The application of low-odor responsive 9727 in household products can not only meet the above standards, but also significantly improve the comfort and durability of the product. A study conducted by the School of Architecture of Tsinghua University showed that mattress foam prepared using 9727 reduced TVOC release by about 40% compared to traditional foam and showed better results in performance indicators such as hardness and permanent compression deformation. . In addition, the application of 9727 has significantly improved the resilience of the mattress and extended the service life of the product.
Table 3: Effects of different additives on the foam performance of mattresses
| Addant Type | TVOC release (mg/m³) | Hardness (N) | Compression permanent deformation (%) |
|---|---|---|---|
| No additives | 0.7 | 200 | 15 |
| Traditional additives | 0.5 | 180 | 12 |
| 9727 | 0.3 | 190 | 8 |
4.3 Application in building insulation materials
Polyurethane foam is a highly efficient insulation material and is widely used in building exterior walls, roofs, floors and other parts. However, traditional polyurethane foam often releases a large amount of VOC during construction, causing pollution to construction workers and the surrounding environment. In addition, harmful substances in the foam may also spread through the air, affecting indoor air quality.
The application of low-odor responsive 9727 in building insulation materials can effectively solve this problem. According to a study by the National Renewable Energy Laboratory (NREL), the exterior wall insulation foam prepared using 9727 is about 60% lower than traditional foam in terms of VOC emissions, and in terms of performance indicators such as thermal conductivity and compressive strength. Show better results. The study also pointed out that the application of 9727 not only improves the insulation performance of the foam, but also enhances the weather resistance and anti-aging properties of the foam, extending the service life of the building.
Table 4: Effects of different additives on the properties of exterior wall insulation foam
| Addant Type | VOC emissions (mg/m³) | Thermal conductivity coefficient (W/m·K) | Compressive Strength (MPa) |
|---|---|---|---|
| No additives | 150 | 0.025 | 0.2 |
| Traditional additives | 100 | 0.024 | 0.22 |
| 9727 | 60 | 0.022 | 0.25 |
5. Review of relevant domestic and foreign literature
5.1 Foreign literature
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Fraunhofer Institute for Chemical Technology (ICT)
- Literature Title: Reduction of VOC Emissions in Automotive Interior Materials Using Low-Odor Reactive Additives
- Main content: This study explores the application of low-odor reactive additives in automotive interior materials, especially the performance of 9727 in polyurethane foam. Research shows that 9727 can significantlyLow VOC emissions and does not affect the mechanical properties of the foam.
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National Renewable Energy Laboratory (NREL)
- Literature Title: Enhancing the Performance of Polyurethane Foam for Building Insulation with Low-VOC Additives
- Main content: This study evaluated the application effect of 9727 in building insulation materials and found that 9727 not only reduced VOC emissions, but also improved the insulation performance and weather resistance of foam.
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American Society for Testing and Materials (ASTM)
- Literature Title: Standard Test Methods for Determining Volatile Organic Compounds in Polyurethane Foams
- Main content: This standard specifies the method of determining the VOC content in polyurethane foam, providing a scientific basis for evaluating the effect of 9727.
5.2 Domestic literature
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School of Architecture, Tsinghua University
- Literature Title: Effect of low-odor reaction additives on the properties of polyurethane foams for households
- Main content: This study explored the application of 9727 in household mattress foam, and found that 9727 can significantly reduce TVOC release and improve the resilience and durability of the foam.
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China Building Materials Federation
- Literature title: Research on the environmental protection properties of polyurethane foam plastics for furniture
- Main content: This study analyzed the impact of different additives on the environmental protection performance of polyurethane foam for furniture, and proposed that 9727 is one of the ideal low VOC additives.
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China Automotive Technology Research Center
- Literature title: Research on the control technology of VOC emissions in automotive interior materials
- Main content: This study introduces the application of 9727 in automotive interior materials, pointing out that 9727 can effectively reduce VOC emissions and comply with international standards.
6. Conclusion
As a new type of polyurethane foaming additive, low-odor reaction type 9727 has shown great application potential in the production of polyurethane foam due to its unique chemical structure and excellent properties. By inhibiting side reactions, promoting uniform foaming and adjusting curing speed, 9727 can significantly reduce the odor and VOC emissions of polyurethane foam while improving the physical and processing properties of the foam. In the fields of automotive interiors, household goods, building insulation materials, etc., the application of 9727 not only meets environmental protection and health needs, but also improves the quality and user experience of the product.
In the future, with the increasing strictness of environmental protection regulations and consumers’ attention to healthy life, the low-odor responsive 9727 will surely be widely used in the polyurethane foam industry. Researchers should continue to explore their application potential in other fields and further optimize their formulations to meet the needs of different application scenarios.