Thermoplastic elastomer mixed soft segment and preparation method thereof

Abstract

The invention relates to a thermoplastic elastomer mixed soft segment and a preparation method thereof. The preparation method comprises the following steps: (1) reacting (acrylate-base methyl) dimethyl-acrylate-base silane with hydroxyl-terminated polydimethylsiloxane in an organic solvent to obtain acrylate-base methyl-terminated polysiloxane; and (2) dissolving amino-terminated polyether in a solvent B at room temperature, heating to 15-30 DEG C in an inert gas protective atmosphere, adding the acrylate-base methyl-terminated polysiloxane, and stirring for 12-24 hours while keeping the temperature to perform polymerization reaction, thereby obtaining the mixed soft segment. The polyether-polysiloxane mixed segment polymer product has stable properties, and can be easily characterized. The amine-olefine addition reaction is utilized to connect the polyether and polysiloxane; and the whole polymerization process has the advantages of stable and efficient reaction, high reaction degree (up to 100%), no need of any catalyst, and no byproduct generation.

Description

Technical field: [0001] The invention relates to a mixed soft segment of a thermoplastic elastomer and a preparation method thereof, belonging to the technical field of copolymers. Background technique: [0002] Thermoplastic polyurea-polysiloxane block copolymerized elastomer has been highly concerned and researched in the past 20 years due to its excellent mechanical properties and stable chemical properties; it consists of polysiloxane as the soft segment and polyurea as the hard chain Segments, which are connected in a certain order to form elastomer molecular segments; in thermoplastic elastomers, in view of the shortcomings of a single soft segment, the introduction of a second soft segment can effectively overcome the shortcomings of a single soft segment, making thermoplastic elastomers both It has the excellent performance of two kinds of soft segments. [0003] Due to the huge difference in the solubility parameters of the non-polar polysiloxane chains and the hig...

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Problems solved by technology

The problems in this method are as follows: 1): The isocyanate group is extremely active, and when the soft chain segment is connected, it reacts with the soft chain segment too fast, causing the reaction to be uncontrollable, and the degree of reaction cannot be detected; 2): due to relying on The isocyanate connects the two amino-terminated soft chain segments, which inevitably leads to contact between the super-polar isocyanate group and the weakly polar polysiloxane, resulting in sharp microphase separation; 3): because the isocyanate group is extremely Unstable, the characterization of the mixed soft segment cannot be carried out well, and whether the molecular structure can ideally follow the designed structure is unknown

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