Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing material with negative Poisson ratio characteristic

A specific and negative Poisson's ratio technology, which is applied in the field of preparation of materials with negative Poisson's ratio characteristics, can solve the problems of high material brittleness, difficult processing, and limited varieties.

Active Publication Date: 2016-08-17
NAVAL UNIV OF ENG PLA
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional natural negative Poisson's ratio materials have defects such as limited varieties, difficult processing, and difficulty in industrialization. Therefore, attempts are made to make negative Poisson's ratio materials by modification and synthesis.
At present, the negative Poisson's ratio materials that have been artificially synthesized include polyurethane, polypropylene, and polyethylene materials, but these materials with negative Poisson's ratio characteristics are too brittle to be used in industry

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Weigh 80 parts of powder polytetrafluoroethylene, 5 parts of ultra-high molecular weight polyethylene, and 20 parts of kaolin according to the composition weight ratio; then place the powder polytetrafluoroethylene, carbonyl iron powder and filler in an environment of 35 ° C for 24 ±1h dry to remove water;

[0020] 2) Mix the powdered polytetrafluoroethylene, carbonyl iron powder and kaolin dried in step 1), then add 20 parts of gasoline, mix evenly, and obtain a viscous mixture;

[0021] 3) Add the viscous mixture obtained in step 2) into a plunger extruder to extrude the formed rod-shaped product; then make a sheet with a thickness of 1.50 mm in a two-roll calender; bake at 100°C for 12 hours, 200 Bake at ℃ for 12 hours to remove residual additives;

[0022] 4) The product extruded in step 3) is introduced into a high-temperature traction device, stretched and heat-set in an environment of 150° C., and the stretch ratio is 20.

[0023] 5) The material to be stret...

Embodiment 2

[0025] Embodiment 2, with embodiment 1, the difference is,

[0026] 1) 80 parts of powder polytetrafluoroethylene, 5 parts of ultra-high molecular weight polyethylene, and 20 parts of kaolin are claimed in parts by weight;

[0027] 2) Mix the dried powdered polytetrafluoroethylene, ultra-high molecular weight polyethylene and kaolin in step 1), then add 20 parts of gasoline, and mix evenly to obtain a viscous mixture;

[0028] 4) The product extruded in step 3) is introduced into a high-temperature traction device, stretched and heat-set in an environment of 150° C., and the stretch ratio is 30.

[0029] 5) The material to be stretched in step 4) is pulled out from the high-temperature device, and slowly cooled down to normal temperature to obtain a magnetorheological material with a negative Poisson's ratio. Its negative Poisson's ratio is -6.38 and its Shore hardness is 40A.

Embodiment 3

[0030] Embodiment 3, with embodiment 1, the difference is,

[0031] 1) Weigh 80 parts of powder polytetrafluoroethylene, 40 parts of ultra-high molecular weight polyethylene, and 20 parts of kaolin by parts by weight;

[0032] 2) Mix the dried powdered polytetrafluoroethylene, ultra-high molecular weight polyethylene and kaolin in step 1), then add 20 parts of gasoline, and mix evenly to obtain a viscous mixture;

[0033] 4) The product extruded and baked in step 3) is introduced into a high-temperature traction device, stretched and heat-set in an environment of 150° C., and the stretch ratio is 10.

[0034] 5) The material to be stretched in step 4) is pulled out from the high-temperature device, and slowly cooled down to normal temperature to obtain an elastomer material with negative Poisson's ratio characteristics. Its negative Poisson's ratio is -1.57 and its Shore hardness is 75A.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Shore hardnessaaaaaaaaaa
Shore hardnessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing a material with negative Poisson ratio characteristic, wherein the method comprises the steps: weighing 80-100 parts of powdery polytetrafluoroethylene, 5-40 parts of ultrahigh-molecular-weight polyethylene and 5-20 parts of a filler, and drying to remove water; mixing, adding 10-20 parts of a processing auxiliary agent, and mixing evenly, to obtain a viscous mixture; adding the viscous mixture into an extruder, and extruding to form a stick-like material; preparing a sheet with the thickness of 1.50 mm in a double-roller calender; in environments of the temperature of 100 DEG C and 200 DEG C, respectively drying for 12 h, and removing the residual auxiliary agent; introducing the extruded product into a high-temperature traction device, stretching and heat-setting in an environment of the temperature of 150 DEG C with the stretching ratio of 0-30; and carrying out traction from a high-temperature traction device, cooling to room temperature, and thus obtaining the material with the negative Poisson ratio characteristic. The material prepared by the method is an elastomer material, and the elastomer material has the negative Poisson ratio characteristic, is soft in texture, has the Shaw hardness of 40 A-75 A, is moderate in hardness, and is suitable for application in industry and engineering.

Description

technical field [0001] The invention belongs to the field of vibration and noise reduction materials, and in particular relates to a preparation method of a material with negative Poisson's ratio characteristics. Background technique [0002] Negative Poisson's ratio materials have very strange and excellent properties. The volume of the cross section perpendicular to the stretching direction expands when subjected to tension, and shrinks in volume in this direction when subjected to pressure. The material with negative Poisson’s ratio protrudes from the middle of the material after being subjected to bending force, and an obvious interface supporting the external force appears. At the same time, the negative Poisson's ratio material has a good stress dispersion effect, showing an extremely low bulk modulus and a very high shear modulus. [0003] Negative Poisson's ratio materials have good application prospects and can be used in traffic road facilities and daily necessiti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L23/06C08K3/34
CPCC08L27/18C08L2207/068C08L23/06C08K3/346
Inventor 何琳杨雪帅长庚吕志强
Owner NAVAL UNIV OF ENG PLA