Polyolefin/styrene series elastomer/conductive carbon black electro shape memory material and preparation method thereof

A conductive carbon black and styrene-based technology, which is applied in the field of shape memory polymer blend materials and their preparation, can solve the problems of affecting the mechanical properties of materials, poor shape memory function, increasing processing difficulty, etc., and achieves reasonable composition and matching. The effect of high recovery rate and easy production scale

Inactive Publication Date: 2008-02-20
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are some disadvantages in the method of preparing this membrane material: ①The process is complicated, and the solvent used may be highly corrosive or toxic, which is easy to cause large-scale pollution; ②The monomers, carbon nanotubes and various solvents used are all expensive , high production cost; ③ poor mechanical properties, such as the elongation at break is only about 100%, which is a fatal flaw for the application of memory materials, and the modulus is only about 100MPa
There are also many disadvantages in using this method to obtain electro-induced shape memory polymer materials: ①The current production scale of the matrix polycaprolactone is small, the source is limited, and the price is expensive; ②The crosslinking is induced by irradiation, not only the production cost is high , and there is a risk of leakage; ③The amount of conductive carbon black added is large, reaching 25%, which not only increases the cost, affects the mechanical properties of the material, but also increases the difficulty of processing; ④The shape memory function is poor, and its When the applied voltage is as high as 200v, the recovery rate can reach more than 90%, and the recovery time is as long as 140s

Method used

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  • Polyolefin/styrene series elastomer/conductive carbon black electro shape memory material and preparation method thereof
  • Polyolefin/styrene series elastomer/conductive carbon black electro shape memory material and preparation method thereof
  • Polyolefin/styrene series elastomer/conductive carbon black electro shape memory material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] First, 38.4 parts of SEBS, 10 parts of conductive carbon black, and 9.6 parts of polyethylene wax were added to an ordinary internal mixer, the temperature was raised to a melt temperature of 200 ° C, and blended for 15 minutes; then the resulting SEBS blend was mixed with 32 parts HDPE with a melt flow rate of 5-8g / 10min, 8 parts of conductive carbon black, 0.2 parts of DCP, and 1.8 parts of maleic anhydride are blended in an ordinary internal mixer at a melt temperature of 200°C for 10 minutes. That is, get the SMPM.

[0066] The shape recovery rate of the SMPM is 85-90%, the fixation rate is 85-87%, the tensile strength is 9-12MPa, the recovery time is 40-60s, the recovery voltage is 200v, and the gel rate is 3-5%.

Embodiment 2

[0068] First add 40 parts of SIS, 6 parts of conductive carbon black, and 8 parts of oxidized polyethylene wax into an ordinary internal mixer, heat up to a melt temperature of 180 ° C, blend for 10 minutes and pelletize; then pelletize the pelletized SIS The mixture is mixed with 32 parts of LDPE with a melt flow rate of 9-11g / 10min, 12 parts of conductive carbon black, 1.7 parts of polyethylene wax, and 0.3 parts of AD. , blending at a melt temperature of 185°C for 2 minutes to obtain SMPM.

[0069] The shape recovery rate of the SMPM is 88-90%, the fixation rate is 83-87%, the tensile strength is 10-15MPa, the recovery time is 60-80s, the recovery voltage is 180-200v, and the gel rate is 5-7%.

Embodiment 3

[0071] Add 40 parts of SEBS, 30 parts of PP with a melt flow rate of 1.5-3g / 10min, 20 parts of conductive carbon black, 8 parts of polypropylene wax, 0.2 parts of DCP, and 1.8 parts of silane coupling agent into a high-speed mixer for premixing After uniformity, put into a twin-screw extruder, and blend for 6 minutes at a melt temperature of 165°C to obtain SMPM.

[0072] The shape recovery rate of the SMPM is 85-90%, the fixation rate is 80-85%, the tensile strength is 9-13MPa, the recovery time is 50-70s, the recovery voltage is 210-220v, and the gel rate is 1-3%.

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Abstract

The invention discloses a polyolefine / styrene system elastomer / graphitized carbon black electro-shaped memory material, which is characterized in that the components of the material by weight are: polyolefine 20-40 portions, styrene system elastomer 30-40 portions, graphitized carbon black 18-22 portions, plasticizer 6-10 portions, cross linker 0-2 portions and auxiliary cross linker 0-10 portions, the elongation at break is 300-550 percent, recovery (150-200V AC) 80-95 percent, fixed ratio (20 DEG C) 80-96 percent, recovery responding temperature 60-100 DEG C and recovery time 20-80s. The invention further discloses a preparation method of the material. The electro-shaped memory material of the invention not only has good memory performance, low cost and good comprehensive mechanical property, but also has good processing property, thereby being processed repeatedly, which is favorable for recycling. The raw material used in the method of the invention has low cost and simple technique, thereby needing no special processing equipment and being easy to be popularized and applied.

Description

technical field [0001] The invention belongs to the technical field of shape-memory polymer blend materials and preparation thereof, and in particular relates to a polyolefin / styrene-based elastomer / conductive carbon black electro-induced shape-memory material and a preparation method. Background technique [0002] Since the 1980s, shape memory polymers have attracted great interest and developed rapidly. Electric shape memory polymer is a very unique shape memory material. It is widely used in aerospace, military, electronic communication, transportation, medical and health, commodity identification, entertainment and sports, clothing, parts of daily necessities, agriculture, energy, etc. The field has broad application prospects. Unfortunately, there are not many studies on electro-sharp memory polymers, and the results are often unsatisfactory. [0003] At present, the existing electro-sharp memory polymer materials are mainly obtained by synthesizing new shape-memory p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/00C08L53/02C08K5/14B29C61/06C08K3/04
Inventor 吴智华张永伟孟兵
Owner SICHUAN UNIV
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