Composite enhanced hydrolysis-resistant thermoplastic polyurethane elastomer and its preparation method

Abstract

The invention provides a composite enhanced hydrolysis-resistant thermoplastic polyurethane elastomer composition comprising a thermoplastic polyurethane elastomer body and nano silica, and the composition is characterized in that: the surface of the nano silica is modified by coating of a silane coupling agent, the weight ratio of nano silica to silane coupling agent is 25:1-15:1, and the silane coupling agent is gamma-glycidoxypropyltrimethoxysilane. A preparation method of the composition is as follows: the surface of the nano silica is coated with the silane coupling agent gamma-glycidoxypropyltrimethoxysilane containing epoxy groups, and then the nano silica is combined with the thermoplastic polyurethane elastomer (TPU) body, on the one hand, dispersity of the nano SiO2 in TPU can be improved, and adverse effects caused by agglomeration can be inhibited; on the other hand, the initial mechanical properties and hydrolysis resistance of TPU material can be effectively improved, stable mechanical properties of TPU products can be maintained, and the TPU products have broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic polyurethane elastomer (TPU), and in particular relates to a composite reinforced hydrolysis-resistant thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) is a kind of polymer synthetic material composed of flexible segment and rigid segment, which has rubber elasticity at low temperature and can be plasticized at elevated temperature. It has been widely used in sanitation and automotive materials. [0003] Thermoplastic polyurethane elastomer TPU has excellent low temperature resistance, impact resistance, wear resistance and wide hardness range. However, TPU is a polar polymer material, and it is easy to absorb moisture in the air during use. The chemical reaction of groups such as ester group, carbamate group and urea group in the chemical reaction will lead to the degradation of the molecular cha...

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Problems solved by technology

The epoxy component has low reactivity and a large amount of addition, which has an adverse effect on the performance of the thermoplastic polyester elastomer itself; simple addition of carbodiimide components can achieve ideal hydrolysis resistance, but it will make polyurethane elastic other properties of the body, such as high temperature resistance

At the same time, the addition of anti-hydrolysis agents carbodiimides or epoxies reported in existing patents and literature can improve the hydrolysis resistance of TPU. At present, there are no patent reports combining these two methods.

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