A kind of non-yellowing thermoplastic polyurethane elastomer and preparation method thereof

Abstract

The invention provides a non-yellowing thermoplastic polyurethane elastomer and a preparation method thereof, comprising the following components in parts by weight: 50-60 parts of hexamethylene diisocyanate; 80-150 parts of polyether polyol; 10-15 parts of oxygen agent; 5-10 parts of composite ultraviolet absorber; 5-10 parts of chain extender; 1-5 parts of catalyst; 1-3 parts of coupling agent. The thermoplastic polyurethane elastomer provided by the invention has the performance of yellowing resistance, wherein the level of light yellowing resistance is above grade 4.

Description

technical field [0001] The invention belongs to the technical field of modified polyurethane and relates to a thermoplastic polyurethane elastomer and a preparation method thereof, in particular to a non-yellowing thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Since the groups contained in the polyurethane macromolecules are all strong polar groups, and the macromolecules also contain polyether or polyester flexible segments, the polyurethane has high mechanical strength, oxidation stability, and high flexibility. Excellent oil resistance, solvent resistance, water resistance and fire resistance. Because polyurethane has many excellent properties, it has a wide range of uses. Polyurethane can be mainly used as polyurethane synthetic leather, polyurethane foam, polyurethane coating, polyurethane adhesive, polyurethane rubber (elastomer), polyurethane fiber and the like. In addition, polyurethane is also used in civil eng...

AI Technical Summary

Problems solved by technology

Long-term exposure of molecular segments in polyurethane to light and nitrogen oxides can easily lead to yellowing and decline in physical and mechanical properties

[0003] At present, the main way to improve the light resistance and aging resistance of polyurethane is to add a large amount of antioxidants, light stabilizers, whitening agents, etc. This method cannot fundamentally solve the problem of yellowing, and the existence of a large number of additives will affect the Harmful to people's health, in addition, antioxidants are easy to migrate, and eventually lead to yellowing of fabrics

CN104974326A discloses a preparation method of non-yellowing flexible polyurethane foam, which uses a semi-prepolymer method to mix polyether polyols, blowing agents, surfactants, catalysts and aliphatic polyurethane prepolymers at 30 Polyurethane is prepared at -40°C. In order to improve the reactivity of the system, polyether polyols with high-end hydroxyl content are used, which has more restrictions on raw materials. At the same time, a large amount of metal catalysts or even organotin catalysts are used. There is a certain toxicity

CN102336885A discloses a method for preparing a polyurethane sponge with excellent environmental tolerance. It adopts a one-step method to prepare foam, which requires the use of a large amount of catalysts. At the same time, hindered phenolic antioxidants and hindered amine light stabilizers need to be added to the formula, but Antioxidants and stabilizers are easy to migrate, which will cause the sponge to turn yellow and have a certain impact on the human body

In addition, the formulation uses a physical foaming agent, which may be toxic or harmful to the ozone layer

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