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Static stretching mixer and its method for preparing polymer nanocomposites
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A nano-composite material and mixer technology, applied in the field of organic material processing, can solve the problems of production difficulty, efficiency and benefit contradiction, and achieve the effects of low cost, wide promotion and use space, and simple structure
Active Publication Date: 2020-01-17
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
At present, the preparation of small batches of nanocomposites with uniformly dispersed particles has been realized in experimental research, but it is still difficult to produce on an industrial scale, mainly limited by the contradiction between efficiency and benefit
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Embodiment 1
[0074] This embodiment provides a static stretching mixer, such as figure 1 and figure 2 As shown, the static stretching mixer includes a shaft sleeve 1, a mandrel 2 and a sealing plate 3;
[0075] The mandrel 2 is arranged in the bushing 1, and the bushing 1 and the mandrel 2 are respectively connected with the sealing plate 3;
[0076] The mandrel 2 includes a distribution area, a collection area, a stretching area and a screwing area connected in sequence;
[0077] The stretching zone is composed of a periodically changing stretching channel designed based on the principle of extensional rheology, which is the main working area of the mandrel 2; the stretching channel is composed of the stretching zone and The gap between the sleeves 1 is composed.
[0078] The distribution area is composed of multi-helical grooves, and the melt containing nanoparticles can simultaneously realize circumferential or axial flow on the surface of the melt distribution area to realize uni...
Embodiment 2
[0115] The static stretching mixer involved in this embodiment and its method for preparing polymer nanocomposites are basically the same as in Example 1, except that:
[0116] The dispersed phase is nano carbon black.
[0117] The polymer matrix is polyethylene.
[0118] The processing aid is glycerol.
[0119] The mass ratio m of the nano carbon black, the polyethylene and the glycerol 1 :m 2 :m 3 For 20:80:2.
[0120] The continuous mixing equipment described in step 2 is replaced by intermittent mixing equipment; and the intermittent mixing equipment is a kneader extruder.
Embodiment 3
[0122] The static stretching mixer involved in this embodiment and its method for preparing polymer nanocomposites are basically the same as in Example 1, except that:
[0123] The dispersed phase is carbon nanotubes.
[0124] The polymer matrix is polypropylene.
[0125] Described processing aid is zinc stearate.
[0126] The mass ratio m of the carbon nanotube, the polypropylene and the zinc stearate 1 :m 2 :m 3 It is 10:90:2.
[0127] Step 2 adopts continuous extrusion equipment, then the content of step 3 is to install the static stretching mixer directly between the head of the continuous extrusion equipment and the filter plate, and prepare a product with good distribution and dispersion forms. Polymer Nanocomposites.
[0128] The continuous extrusion equipment is a twin-screw extruder.
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Abstract
The invention belongs to the technical field of organic material processing, and particularly relates to a static stretching mixer and a method for preparing the polymer nanocomposite material by using the same. The static stretching mixer comprises a shaft sleeve, a mandrel and a sealing plate; the core shaft comprises a distribution area, a collecting area, a stretching area and a screwing areawhich are connected in sequence; the stretching area is composed of a stretching flow channel which is designed based on the stretching rheological principle and has periodic changes, and the stretching area is a main working area of the mandrel; and the stretching flow channel is composed of gaps between the stretching area and the shaft sleeve. The static stretching mixer is provided with a stretching flow interface with periodic oscillating characteristics based on the stretching rheological principle, stretching deformation and stretching stress in the flow direction are applied to a polymer nanocomposite material melt with high viscosity for multiple times, the flow shape of the multi-scale flow-dividing, rotating, stretching and flow-converging is induced and established, so that theflow instability at the moment of pressure release of the melt is expanded, and uniform dispersion and distribution mixing of nano particles are realized.
Description
technical field [0001] The invention belongs to the technical field of organic material processing, and in particular relates to a static stretching mixer and a method for preparing polymer nanocomposite materials. Background technique [0002] Polymer nanocomposites with flexible processing characteristics are the research focus of almost all polymer fields. They are generally prepared by mixing the continuous phase of viscoelastic polymers and the dispersed phase of nanoparticles in a state of melt or solution. [0003] There are two main methods of dispersive mixing of melts: one is shear dispersive mixing of melts; the other is stretching, crushing and dispersive mixing of melts. As far as the shear dispersion mixing of the melt is concerned (take the twin-screw extrusion process as an example), the shear force applied to the melt of the polymer nanocomposite material is still to promote the polymer at the micro-nano scale. Molecular chains produce irreversible tensile ...
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