Method for post-ripening catalyst TAP to improve durability of polyurethane products
Introduction
Polyurethane (PU) is a polymer material widely used in the fields of construction, automobile, furniture, shoe materials, etc. Its excellent physical properties and chemical stability make it one of the indispensable materials in modern industry. However, polyurethane products often face durability problems during use, such as aging, cracking, discoloration, etc. In order to improve the durability of polyurethane products, the post-ripening catalyst TAP (Triazine-based Amine Polyol) was introduced into the production process of polyurethane. This article will introduce in detail the mechanism of action, usage method, product parameters and its effect on improving the durability of polyurethane products.
1. Basic concepts of post-mature catalyst TAP
1.1 What is post-mature catalyst TAP?
Post-curing catalyst TAP is an amine polyol catalyst based on the triazine structure, which is mainly used in the post-curing process of polyurethane products. Post-matured refers to the fact that the polyurethane product is further cross-linked and cured by certain temperature and humidity conditions after forming, thereby improving the physical properties and chemical stability of the product.
1.2 Mechanism of action of TAP catalyst
TAP catalysts enhance the crosslinking density of the product by promoting the crosslinking reaction of the polyurethane molecular chain, thereby enhancing its mechanical strength, heat resistance and chemical resistance. Specifically, during the post-ripening process of polyurethane, the TAP catalyst can accelerate the reaction between isocyanate and polyol, forming a more stable three-dimensional network structure.
2. How to use TAP catalyst
2.1 Add ratio
The addition ratio of the TAP catalyst is usually from 0.5% to 2.0% of the total weight of the polyurethane. The specific proportions should be adjusted according to the performance requirements of the product and the production process. The following is a typical addition scale table:
| Product Type | TAP catalyst addition ratio (%) |
|---|---|
| Soft foam | 0.5 – 1.0 |
| Rough Foam | 1.0 – 1.5 |
| Elastomer | 1.5 – 2.0 |
2.2 Time to add
TAP catalysts are usually added during the prepolymer stage of polyurethane. Specific stepsThe steps are as follows:
- Preparation of prepolymers: Mix the polyol and isocyanate in a certain proportion to form a prepolymer.
- Catalytic Addition: After the prepolymer is mixed evenly, add the TAP catalyst and continue to stir until it is uniform.
- Modeling and Post-Mature: Inject the mixed materials into the mold for molding and post-Mature processing.
2.3 Post-mature conditions
Post-ripening conditions have an important influence on the effect of TAP catalyst. Typically, the post-curing temperature is from 80°C to 120°C, with a time of 2 to 8 hours. Specific conditions should be adjusted according to the product type and thickness. The following is a typical post-mature condition table:
| Product Type | Post-ripening temperature (°C) | Post-mature time (hours) |
|---|---|---|
| Soft foam | 80 – 100 | 2 – 4 |
| Rough Foam | 100 – 120 | 4 – 6 |
| Elastomer | 110 – 120 | 6 – 8 |
3. Effect of TAP catalyst on the durability of polyurethane products
3.1 Improvement of mechanical properties
TAP catalysts significantly enhance their mechanical properties by increasing the crosslinking density of polyurethane products. The following is a table of improvements in mechanical properties of TAP catalysts on polyurethane products:
| Performance metrics | TAP catalyst not used | Using TAP catalyst | Elevation (%) |
|---|---|---|---|
| Tension Strength (MPa) | 10 | 15 | 50 |
| Elongation of Break (%) | 200 | 250 | 25 |
| Tear strength (kN/m) | 20 | 30 | 50 |
3.2 Improvement of heat resistance
TAP catalysts can significantly improve the heat resistance of polyurethane products and maintain stable performance under high temperature environments. The following is the table of improving the heat resistance of TAP catalysts on polyurethane products:
| Temperature (°C) | TAP catalyst not used (holding time, hours) | Use TAP catalyst (holding time, hours) | Elevation (%) |
|---|---|---|---|
| 100 | 50 | 100 | 100 |
| 120 | 20 | 50 | 150 |
| 150 | 5 | 15 | 200 |
3.3 Improvement of chemical resistance
TAP catalyst enhances its chemical resistance by increasing the crosslinking density of polyurethane products, making it stable in chemical environments such as acids, alkalis, and solvents. The following is a table of improvements in chemical resistance of TAP catalysts to polyurethane products:
| Chemical Media | TAP catalyst not used (holding time, hours) | Use TAP catalyst (holding time, hours) | Elevation (%) |
|---|---|---|---|
| 10% HCl | 20 | 50 | 150 |
| 10% NaOH | 30 | 70 | 133 |
| 10 | 30 | 200 |
4. Product parameters of TAP catalyst
4.1 Physical Properties
The following is the TAP catalystTypical physical properties table:
| parameter name | value |
|---|---|
| Appearance | Colorless to light yellow liquid |
| Density (g/cm³) | 1.05 – 1.10 |
| Viscosity (mPa·s) | 100 – 200 |
| Flash point (°C) | >100 |
| Solution | Soluble in water and alcohols |
4.2 Chemical Properties
The following is a typical chemical properties of TAP catalysts:
| parameter name | value |
|---|---|
| pH value | 8.0 – 9.0 |
| Active ingredient content (%) | 95 – 98 |
| Storage Stability | 12 months |
5. Application cases of TAP catalyst
5.1 Car interior
In automotive interiors, polyurethane foam materials are widely used in seats, instrument panels, door panels and other components. After using TAP catalyst, the durability of these components is significantly improved, and they can maintain stable performance in high temperature and high humidity environments and extend their service life.
5.2 Building insulation materials
In building insulation materials, polyurethane rigid foam is widely used in insulation layers of walls, roofs and floors. After using TAP catalyst, the heat resistance and chemical resistance of these insulation materials are significantly improved, and they can maintain stable insulation properties in harsh environments.
5.3 Shoe material
In shoe materials, polyurethane elastomers are widely used in soles and insoles. After using the TAP catalyst, the mechanical properties and chemical resistance of these shoes are significantly improved, and they can maintain stable comfort and durability during long-term use.
6. Conclusion
The post-ripening catalyst TAP significantly enhances its machinery by increasing the cross-linking density of polyurethane productsPerformance, heat resistance and chemical resistance improve the durability of the product. By reasonably adjusting the addition ratio and post-mature conditions of TAP catalyst, the performance of polyurethane products can be further optimized to meet the needs of different application fields. The application of TAP catalyst provides an effective solution for improving the durability of polyurethane products and has broad market prospects.
Appendix: Precautions for the use of TAP catalyst
- Storage conditions: TAP catalyst should be stored in a cool and dry environment to avoid direct sunlight and high temperatures.
- Safe Operation: When using TAP catalyst, protective gloves and glasses should be worn to avoid direct contact with the skin and eyes.
- Waste treatment: Waste TAP catalysts should be treated in accordance with local environmental protection regulations to avoid pollution to the environment.
Through the above detailed introduction, I believe that readers have a deeper understanding of the application of post-mature catalyst TAP in improving the durability of polyurethane products. I hope this article can provide valuable reference for technicians and researchers in relevant industries.
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