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Differences between polyurethane MDI and TDI systems for elastomer machines

Introduction:

Polyurethane elastomer machines play an important role in modern industry. However, when it comes to choosing a polyurethane system, there are two main options: the MDI (diphenylmethane diisocyanate) system and the TDI (terephthalate) system. This article will explore the differences between these two systems to help the reader make a more informed choice for a particular application.

I. Elastomer Machines for Polyurethane MDI Systems

Definition and Composition: the MDI system is a polyurethane elastomer manufactured from diphenylmethane diisocyanate as the main raw material, usually containing auxiliary materials such as polyether polyol and polyester polyol.

Features and Benefits:

High strength and abrasion resistance: MDI system elastomers have excellent physical properties and maintain stability in high stress environments.

Excellent aging resistance: elastomers with MDI systems have good resistance to oxidation and UV radiation and a long service life.

Good resistance to oils and solvents: MDI elastomers remain stable when exposed to chemicals such as oils and solvents.

Application areas: Elastomers of MDI system are widely used in automobile manufacturing, sports equipment and industrial products.

II. Polyurethane TDI system elastomer machines

Definition and composition: TDI system is a polyurethane elastomer manufactured with terephthalate as the main raw material, usually containing auxiliary materials such as polyether polyol and polyester polyol.

Features and Advantages:

Good elasticity and softness: TDI system elastomers have high elasticity and softness and are suitable for products requiring a higher hand feel.

Excellent low-temperature bending performance: TDI system elastomers still have excellent bending performance in low-temperature environments, and are not easy to deform or break.

Suitable for complex shapes: TDI elastomers excel in the manufacture of complex shapes to meet diverse design needs.

Applications: TDI elastomers are widely used in furniture and mattresses, footwear manufacturing and packaging materials.

III. Comparison of MDI and TDI systems

In the field of polyurethane elastomer machines, MDI and TDI systems have different characteristics and advantages. The following tables will further compare their differences in terms of chemical structure, physical properties, environmental protection and safety, production costs and application areas:

comparison item

Polyurethane MDI system

Polyurethane TDI system

chemical structure

Using diphenylmethane diisocyanate as the main raw material Using terephthalate as the main raw material

Response characteristics

High degree of crosslinking less cross-linked

physical properties

– High strength and wear resistance – good elasticity and softness
– Excellent aging resistance – Excellent bending performance at low temperature
– Good oil and solvent resistance – Suitable for products with complex shapes

Environmental protection and safety

low isocyanate content high isocyanate content

Cost of production

higher cost lower cost

Application field

– Car manufacturer – furniture and mattresses
– Sports Equipment – Footwear manufacturing
– Industrial products – Packaging Materials

As can be seen from the above table, elastomers of the polyurethane MDI system have high strength, aging resistance and oil resistance, and are suitable for use in automotive manufacturing, sports equipment and industrial products. On the other hand, polyurethane TDI system elastomers have good elasticity, flexibility and low-temperature bending properties, and are suitable for use in such areas as furniture and mattresses, footwear manufacturing and packaging materials.

It is also worth noting that the MDI system is more expensive to produce, but offers better environmental protection and safety. In contrast, the TDI system has a lower production cost but a higher isocyanate content and is slightly less environmentally friendly than the MDI system. Therefore, when selecting a polyurethane system, manufacturers should consider product performance, environmental requirements and budgetary constraints in order to develop the most suitable production program to meet the needs of different applications.

IV. Application Options and Recommendations

Choosing the right system for different applications: Considering the product requirements and the characteristics of the application area, choosing elastomers with MDI or TDI systems ensures the best performance and cost-effectiveness.

Decision making in relation to product performance and budget: when selecting a system, product performance, environmental requirements and budgetary constraints are taken into account to develop the most suitable production solution.

Conclusion:

Polyurethane MDI and TDI system elastomers each have their own advantages and are suitable for product needs in different areas. Understanding the differences will help manufacturers make informed choices to ensure that their products perform well in specific applications.

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