Brominated butyl rubber/polypropylene thermoplastic vulcanized rubber with low hardness and capability of 3D printing and preparation method and application thereof

Abstract

The embodiment of the invention relates to the field of materials, in particular to a brominated butyl rubber / polypropylene thermoplastic vulcanized rubber with low hardness and capability of 3D printing and a preparation method and application thereof. The brominated butyl rubber / polypropylene thermoplastic vulcanized rubber is prepared from a raw material comprising the following components: polypropylene, brominated butyl rubber, a compatibilizer, a cross-linking agent, an auxiliary cross-linking agent, an antioxidant, stearic acid and oil. The preparation method comprises the following steps of: granulating rubber; oil filling; granulating master batch; vulcanizing. The brominated butyl rubber / polypropylene thermoplastic vulcanized rubber prepared by a formula and the preparation method has the advantages of high mechanical property, good compatibility, good fluidity, high self-adhesion, flat and smooth surface, suitability for 3D printing, low hardness and suitability for medicalrubber plugs. In addition, the feeding mode of single-screw melt feeding solves the problem that wire feeding is difficult when the low-hardness brominated butyl rubber / polypropylene thermoplastic vulcanized rubber is used for 3D printing.

Description

technical field [0001] The invention relates to the field of materials, in particular to a low-hardness, 3D-printable brominated butyl rubber / polypropylene thermoplastic vulcanizate and its preparation method and application. Background technique [0002] The working principle of Fused Deposition Modeling (FDM) is to process filamentous hot-melt materials (ABS, PLA, wax, etc.) The sheet contour and filling trajectory move, and the molten material is extruded, deposited at the designated position, solidified and formed, bonded with the previous layer of formed material, and finally formed a product model by layering up. [0003] The performance requirements of FDM 3D printing materials: ① meltable and bondable; ② silky; ③ good fluidity; ④ sufficient bonding strength between layers. The materials used in 3D printing mainly include engineering plastics (ABS, PC, etc.), photosensitive resins, metal materials and ceramic materials. [0004] Elastomeric materials have not been u...

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Problems solved by technology

Existing bromobutyl rubber / polypropylene thermoplastic vulcanizates prepared by blending bromobutyl rubber as the cross-linked rubber phase and polypropylene as the plastic continuous phase are often not suitable for 3D printing due to the following disadvantages: 1 ) The process is complicated and the operation is cumbersome; 2) The cross-linking density distribution of the product is uneven and the performance is poor; 3) The hardness is low and the strength is low. Using its wire rod for FDM 3D printing will cause difficult feeding and easy curling, and intermittent printing, resulting in The printing is discontinuous and the surface is rough, and its application in 3D printing is facing challenges; therefore, there are no reports on the use of bromobutyl rubber / polypropylene thermoplastic vulcanizate for 3D printing

[0006] The preparation of medical rubber stoppers requires thermoplastic vulcanizates with low hardness. Due to the different performance requirements of thermoplastic vulcanizates when used as medical rubber stoppers or 3D printing, medical rubber stoppers require thermoplastic vulcanizates with low hardness, but thermoplastic vulcanizates with low hardness When the vulcanizate is used for 3D printing, it will be difficult to feed materials. Therefore, there is currently no thermoplastic vulcanizate that can be used for both medical rubber stoppers and 3D printing.

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