Method of forming thermoplastic foams using nano-particles to control cell morphology

一种泡沫塑料、纳米颗粒的技术，应用在用于材料和表面科学的纳米技术、纳米技术、纳米技术等方向，能够解决加工困难等问题

Inactive Publication Date: 2006-12-27
OWENS CORNING INTELLECTUAL CAPITAL LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this combination can lead to Difficulty processing

Method used

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  • Method of forming thermoplastic foams using nano-particles to control cell morphology
  • Method of forming thermoplastic foams using nano-particles to control cell morphology
  • Method of forming thermoplastic foams using nano-particles to control cell morphology

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Styrofoam was prepared using an LMP extruder with (7347) and without (7346) a nanoparticle loading of 2.5%. The nanoparticles used to prepare this example were an organoclay of a specific grade Nano-MMT20A from Southern Clay Products Inc. in combination with a polystyrene polymer of a specific grade CX5197 from Atofina Melt mixing to form a molten polymer. When examined by X-ray diffraction, the nanoparticles exhibit an intercalated nano-MMT layer structure. The comparative sample did not contain any nanoparticles but incorporated 0.8% talc loading as a nucleating agent. The comparative sample exhibited an average cell size of about 186 microns, while the exemplary example foam using nanoparticles exhibited a significantly lower average cell size of about 60 microns. This exemplary embodiment also exhibits a cell wall thickness of about 0.5 microns and a scaffold effective diameter of about 5 microns. As reflected in Table 2 below, the exemplary foam composition exhi...

Embodiment 2

[0037] A sample foam (7349) was prepared according to the method outlined in Example 1, but using 0.5% intercalated nano-MMT in the polystyrene composition to obtain a density of about 26.5 kg / m 3 , an exemplary foam having a thickness of about 38 mm and a width of about 600 mm. The reduction in the amount of nano-MMT incorporated into the composition resulted in a slightly increased cell size compared to Example 1, about 83 microns ( image 3 ), while maintaining an improved strength over the comparative foam composition, 329 kPa.

Embodiment 3

[0039] Extruded in LMP using nano-calcium carbonate from Ampacet with a nanoparticle loading of 2%, and 1% talc as an additional nucleating agent and 1% stabilized HBCD as a flame retardant Preparation of foam in machine (7790). The nano-calcium carbonate particles are typically elongated - average size 80nm x 2μιη, and are provided as a 50% masterbatch composition combined with an olefinic copolymer carrier resin. The remaining formulation was polystyrene: 80% Nova 1220 (melt index = 1.45) and 16% Nova 3900 (melt index = 34.5). The exemplary foam produced was 28 mm thick, 400 mm wide and had an average cell size of 230 microns, and the degree of cell orientation (the ratio of the cell size in the extrusion direction to the cell size in the thickness direction (x / z)) up to 1.54 (see Figure 4 ).

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Abstract

A process for making closed-cell, alkenyl aromatic polymer foams using nano-particle nucleation agents to control the cell morphology of the resulting foam includes forming a polymer melt at a temperature above the polymer glass transition temperature (for crystal polymers) or the polymer melt point (for amorphous polymers); incorporating selected nano-particles into the polymer melt; incorporating blowing agents into the polymer melt at an elevated pressure; optionally incorporating other additives, such as flame retardants, into the polymer melt; and extruding the polymer melt under conditions sufficient to produce a foam product having a desired cell morphology, characterized by parameters such as reduced average cell size range and / or increased asymmetry of the cells.

Description

Background of the invention [0001] The present invention relates to a method for preparing alkenyl aromatic polymer rigid foams with a wide range of cell morphologies by using nanoparticles as nucleating agents. This type of rigid foam can be used to form rigid insulating foam panels suitable for many conventional insulation applications. [0002] The physical properties of rigid polymer foam sheets (e.g., their compressive strength, thermal conductivity, dimensional stability, water absorption) depend largely on the microstructure of the material from which the sheet is formed, i.e., the cells of the foam. hole shape. However, controlling polymer foaming to the extent required to consistently produce a desired cell morphology that will optimize the overall properties of the foam, or improve a specific property (e.g., the insulating value of the foam) is difficult. [0003] Prior art attempts to prepare foam microstructures with desired cell morphologies include the use of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00C08J5/00
CPCC08J9/0066C08J2325/04B82Y30/00C08J2205/10C08J5/005C08J2201/03Y10T428/249976Y10T428/249977Y10T428/249978Y10T428/249986C08J9/00C08J9/04
Inventor J·P·林德R·R·罗赫R·M·布里恩德尔
Owner OWENS CORNING INTELLECTUAL CAPITAL LLC
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