Technique for producing elastomer of thermoplastic polyurethane

Abstract

This invention relates to a process for producing thermoplastic polyurethane elastomer. The process comprises: adding diisocyanate, macromolecular diol, chain extender and additives into a twin screw extruder, reacting, extruding and granulating, sending to a drying and aging system, sending to a homogenization bunker, mixing, homogenizing to obtain stable TPU granules, and packaging. The method utilizes the homogenization bunker to homogenize different batches of TPU granules, thus can eliminate quality fluctuations among different batches.

Description

technical field [0001] The invention relates to a production process of thermoplastic polyurethane elastomer, which belongs to the technical field of polymer preparation. Background technique [0002] For the production of thermoplastic polyurethane elastomer (TPU), due to the particularity of the polymer itself, although the process parameter setting and formula of the same brand product are controlled as much as possible, the relevant physical parameters of different batches of products will vary. Certain differences (although all are considered qualified products), the so-called quality fluctuations. Such fluctuations in quality can adversely affect the use of downstream customers. For example, for TPU, downstream customers are mainly spinning, drawing, and injection molding. Due to quality fluctuations, the production of downstream customers is unstable, the drawing film is uneven, thick and thin, easy to break when drawing, and the strength of injection molded objects ...

AI Technical Summary

Problems solved by technology

[0009] Compared with the external circulation blending technology adopted in the early stage, the homogenization silo has the following disadvantages: (1) Large investment and high energy consumption, the external circulation increases power equipment and energy consumption, and increases Production cost; (2) The quality of the product is poor, the material has undergone multiple cycles, and the wear is serious, which affects the product quality; (3) The safety is poor, due to the long-term cycle, the material will generate a lot of static electricity and dust, causing environmental pollution and endangering the human body healthy