Energy absorbing blends
A mixture and polymer technology, applied in the direction of conjugated synthetic polymer rayon, sports accessories, clothing, etc., can solve the problems of no self-support, limited elasticity, complexity, etc., to reduce pressure and stress, and increase the area , to achieve the effect of performance
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Embodiment 1
[0065] The elastomeric polymer component material chosen for the evaluation of the precursor mixing method was linear low density polyethylene (Flexirene MR50, manufactured by Europa Polymeri). Three kinds of intumescent materials were selected to carry out mixing experiments in different proportions. The three swelling materials are DOW Corning silicone swelling 3179, Polastosil AMB-12 and pure PBDMS. These materials were all mixed using a Shaws K13 liter mixer with LLDPE MR50. The LLDPE is first introduced in pellet form into a mill where the temperature due to the shearing of the material reaches about 110°C. The expanding material is then flowed into the internal mixer in the following specific proportions:
[0066] 1.35 wt% 3179, 65 wt% LLDPE.
[0067] 2. 50% by weight 3179, 50% by weight LLDPE.
[0068] 3. 50% by weight Polastosil ABM-12, 50% by weight LLDPE.
[0069] 4. 35% by weight Polastosil ABM-12, 65% by weight LLDPE.
[0070] 5. 30% by weight PBDMS, 70% by w...
Embodiment 2
[0074] Having demonstrated the method of blending dilatants with thermoplastic polymers using standard industrial equipment in Example 1, Example 2 extends this processing route by achieving a closed cell structure.
[0075] One method currently found to be suitable for use with closed cell foam structures is the high pressure gas solution method. In this method, a mass of solid polymer material is filled in a gas (eg, nitrogen) inside an autoclave and subjected to very high pressure at a controlled temperature to force the gas into the solid polymer. The block is then foamed again using the gases in the autoclave at controlled high pressure and temperature. The advantage of this foam manufacturing method is that the pore structure is uniform, and there will be no chemical deposition of general foaming agents.
[0076] In order to confirm that this manufacturing method is appropriate, it must be demonstrated that the mixture remains stable at the high temperatures of the manu...
Embodiment 3
[0091] Both batches of blend material (35 / 65 and 50 / 50 blends) were further processed using the Expancel process to obtain closed cell foams. The specific grade of Expancel used was Akzo Nobel Expancel 092MBl20 which was mixed with the same Hytrel grade to form a masterbatch and resulted in a higher concentration of Expancel in the masterbatch. The masterbatch was then blended with the two blends such that the final weight percent of Expancel in the blend was 8%.
[0092] These two mixtures, as well as pure Hytrel with the same content of Expancel, were subsequently extruded in sheet form. This is done using a heated screw feeder that feeds granular material from a hopper. When the granular material is screwed into the barrel of the machine, the heater raises the temperature of the pellets to about 200°C, making the material assume a molten state. This temperature also activates the Expancel, but the pressure in the barrel prevents the material from forming foam at this stag...
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