TOPTAPE®-Polyurethane-01
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Polyurethane manufacturing process
Polyurethane (PU) is a critical chemical material known for its excellent performance and wide range of applications. Here’s a brief explanation of the PU production process:
Raw Material Preparation:
- The main raw materials for PU include polyols, isocyanates, and chain extenders. Polyols are one of the primary materials for polyurethane, with common types being polyester polyols and polyether polyols. Isocyanates are another primary material, with common types including diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI). Chain extenders commonly used are small molecule diols or diamines.
- These raw materials are mixed in specific proportions, along with catalysts, stabilizers, and other additives.
Prepolymer Synthesis:
- Polyols and isocyanates are added to a reactor in a certain molar ratio and react under the influence of a catalyst to form a prepolymer. The viscosity of the prepolymer gradually increases as the reaction progresses, requiring control over reaction time and temperature to ensure the quality of the prepolymer.
Chain Extension Reaction:
- The prepolymer is mixed with chain extenders for the chain extension reaction, resulting in high molecular weight polyurethane. The speed of the chain extension reaction must also be controlled to avoid phenomena such as bubble formation or gelation.
Post-Processing:
- The polyurethane from the chain extension reaction undergoes post-processing, including curing, degassing, cutting, packaging, and other steps to obtain the final PU product.
- Heating involves placing the formed PU blank into an oven to enhance its mechanical properties and wear resistance. Curing refers to placing the finished PU product into a constant temperature and humidity environment to achieve the desired hardness and strength. Cutting and assembly involve cutting and assembling the finished PU product according to product requirements to obtain the final product shape.
Inspection and Packaging:
- The produced PU products undergo strict quality inspection to ensure they meet relevant standards and requirements. They are then packaged for storage and transportation.
It should be noted that there may be additional details and steps in the PU production process, depending on the specific product and application requirements. Additionally, environmental and safety considerations are important in PU production, with proper selection of raw materials and waste treatment to minimize environmental impact.
Product Details
Here is a table summarizing key parameters of polyurethane:
| Parameter | Description | Range/Value |
|---|---|---|
| Density | The mass per unit volume | 1.2 – 1.3 g/cm³ |
| Hardness (Shore) | Indicates the material’s resistance to indentation | Shore A25 to Shore D98 |
| Thermal Conductivity | Ability to conduct heat | 0.020 – 0.024 W/m·K |
| Tensile Strength | Resistance to breaking under tension | 20 – 50 MPa |
| Elongation at Break | Percentage increase in length before breaking | 200% – 600% |
| Compressive Strength | Ability to withstand loads tending to reduce size | 100 – 250 PSI |
| Flexural Strength | Ability to resist bending or folding | 20 – 40 MPa |
| Impact Resistance | Ability to absorb impact without permanent deformation | High |
| Water Absorption | Ability to absorb and contain water | < 2% |
| Temperature Range | Operating temperature range | -40°C to 120°C |
| Chemical Resistance | Resistance to oils, solvents, and chemicals | Good |
| UV Resistance | Resistance to ultraviolet light | Moderate to good (with additives) |
| Sound Absorption Coefficient | Efficiency of sound absorption | Varies with foam density and thickness |
Product Gallery
Polyurethane manufacturing process
- Raw Material Preparation
- The main raw materials for Polyurethane (PU) include polyether, isocyanate, and polyester. These materials need to be mixed in certain proportions and supplemented with catalysts, stabilizers, and other additives to ensure the smooth progress of the reaction.
- Mixing and Reaction
- The mixed raw materials are sent into a reactor for reaction. The temperature and pressure inside the reactor must be controlled within a specific range to ensure that the reaction proceeds smoothly.
- Dispersion and Foaming
- During the reaction process, dispersants and foaming agents are added. Dispersants help evenly distribute the PU throughout the system, while foaming agents generate gas, creating a foam structure within the polymer.
- Mold Injection
- The reacted PU mixture is injected into molds where it solidifies under pressure and temperature. Molds can be made in various shapes and sizes according to different product requirements.
- Temperature Control and Curing
- The molded PU products are placed in an oven for curing. The time and temperature for curing depend on the specific product to ensure its performance and quality.
- Polishing and Post-Processing
- The cured PU products can undergo post-processing steps such as coating, grinding, and finishing to make their surfaces smoother and more aesthetically pleasing.
- Inspection and Packaging
- The produced PU products undergo strict quality inspection to ensure they meet relevant standards and requirements. They are then packaged for storage and transportation.
TOPTAPE®-Polyurethane-01
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Revolutionize Your World with Polyurethane: The Ultimate Blend of Strength, Flexibility, and Style!
Specifications
Density: Polyurethane typically has a density ranging from 1.2 to 1.3 grams per cubic centimeter (g/cm³).
Hardness: The hardness of polyurethane typically ranges from Shore A25 to Shore D98.
Color: Can be black, gray, or any color depending on the additives used
Thickness:The thickness of polyurethane can vary widely depending on its specific application.
Packaging and delivery
Packaging Details: Protective packaging｜Boxes and cartons｜Pallets
Port: Shanghai
Supply Ability: 10000 Square Meters/Square Meters per Week
Place of Origin: China
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