Thermoplastic polyurethane and its elastomer particles and their preparation method
A technology of thermoplastic polyurethane and elastomer, applied in the field of thermoplastic polyurethane
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[0064]The present invention further provides a method for preparing foamed thermoplastic polyurethane elastomer particles, which comprises the following steps: mixing the following ingredients: based on the total weight of the mixture, 80 to 99.9 wt%, such as but not limited to: 80 wt%, 82 wt%, 84wt%, 85wt%, 86wt%, 88wt%, 90wt%, 92wt%, 94wt%, 95wt%, 96wt%, 98wt%, 98.5wt%, 99wt%, 99.5wt%, or 99.9wt% as described herein thermoplastic polyurethane and optionally 0.1 to 20wt%, such as but not limited to: 0.1wt%, 0.5wt%, 1wt%, 1.5wt%, 2wt%, 4wt%, 5wt%, 6wt%, 8wt%, 10wt%, 12wt% %, 14wt%, 15wt%, 16wt%, 18wt%, or 20wt% of one or more foaming nucleating agents; the mixture is put into the extruder, and injected with one or more blowing agents or co-issued foaming agent; foaming the mixture at the die of the extruder; and granulating with an underwater granulator to obtain foamed thermoplastic polyurethane elastomer particles.
[0065] According to one aspect of the present invention, ...
example
[0073] The present invention is further described in detail through the following examples. It is necessary to point out that the following examples are only used to further illustrate the present invention, and cannot be interpreted as limiting the protection scope of the present invention. Those skilled in the art make some non-essential improvements and improvements to the present invention according to the above-mentioned content of the present invention. Adjustment still belongs to the protection scope of the present invention. Before discussing several non-limiting embodiments of the invention, it is to be understood that this invention is not limited in its application to the details of the particular non-limiting embodiments shown and discussed herein, as the invention is capable of other embodiments . Furthermore, the terminology used herein to discuss the present invention is for the purpose of description rather than limitation. Furthermore, the discussion of like...
example 1
[0080] Example 1: The preparation of thermoplastic polyurethane and the measurement of its Shore hardness
[0081] As shown in Table 1, 2900g of PTMEG with a number average molecular weight of about 1000g / mol or 2900g of PBA with a number average molecular weight of about 1000g / mol were added to a three-necked reaction flask with a stirring device, and the reaction flask was placed in a 110°C oil bath, to carry out vacuum dehydration for 4 hours; 350g 1,4-butanediol, 1g stannous isooctanoate (Evonik T-9), 15gBASF 1010, 20g BASF Add 571 into the reaction bottle, and after fully stirring for 10 minutes, add 1750g MDI; after stirring rapidly for 2 minutes, pour the mixture into a detachable container, put it in a hot air oven at 100°C for 8 hours, take it out, and then pulverize and granulate To obtain crushed thermoplastic polyurethane pellets. The Shore hardness (Shore A) of the prepared thermoplastic polyurethane particle samples 1 to 8 was measured according to the stan...
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