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Preparation method of low temperature expandable graphite/polymer foam material

A technology of expanded graphite and foaming materials, which is applied in the field of preparation of low-temperature expandable graphite/polymer foaming materials, can solve the problems of long storage time, high cost, gas collapse and foaming, and achieves foaming and molding. The method is simple, low cost, and the effect of solving the problem of gas distribution and escape

Inactive Publication Date: 2011-12-21
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is a chemical foaming agent, which releases gas through a chemical reaction. The characteristic is that the foaming material can be placed for a long time, but the cost is high; the other is a physical foaming agent, which is released by the external environment (such as temperature) , pressure, etc.) change the physical state of the foaming agent, thereby producing foaming effect, which is characterized by low cost, but generally it is difficult to make the foaming agent stay in the foaming material for a long time, That is, it is difficult to exist in the polymer for a long time before foaming, so it can only be mixed with the polymer on site before foaming
Moreover, these two types of foaming processes are all gas foaming processes, that is, the process of gas forming cells in polymer elastomers or melts. This process has the problems of gas distribution and escape during the foaming gas process, foam collapse and foam formation. and other phenomena

Method used

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  • Preparation method of low temperature expandable graphite/polymer foam material
  • Preparation method of low temperature expandable graphite/polymer foam material
  • Preparation method of low temperature expandable graphite/polymer foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Choose 50-mesh low-temperature expandable graphite, bake low-temperature expandable graphite and PP (MR=0.36g / 10min) in an oven at 60°C for 3 hours, and mix the low-temperature expandable graphite and polypropylene at a weight ratio of 15:100 to prepare Obtainable PP. Put the sample prepared above into a silicone oil bath at 210°C for foaming. The measured density is 0.66g / cm 3 . Scanning electron microscope picture as figure 1 shown.

Embodiment 2

[0024] Choose 50-mesh low-temperature expandable graphite, bake the low-temperature expandable graphite and PP in an oven at 60°C for 3 hours, and then add 5, 10, 15, and 20 parts of low-temperature expandable graphite per 100 parts by weight of PP to make a mixture, which is Explosive PP. Put the sample prepared above into a silicone oil bath at 220°C for foaming. The density was measured, and the experimental results were as follows figure 2 shown.

Embodiment 3

[0026] Choose 50 mesh low-temperature expandable graphite, add 5, 10, 15, 20 parts of low-temperature expandable graphite per 100 parts of PP to make expandable PP. Put the sample prepared above into a silicone oil bath at 180°C to 260°C for foaming. The density was measured, and the experimental results were as follows image 3 shown.

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Abstract

The invention discloses a method for preparing a low-temperature expandable graphite / polymer foam material. The preparation method is as follows: after the polymer and the low-temperature expandable graphite are fully dried, they are mixed according to a certain ratio to obtain an expandable polymer; Bubbles can generate foamable polymers; the present invention uses low-temperature expandable graphite as a foaming agent; the cost is low, and after being prepared into foamable polymers, it can be placed for a long time before foaming operations and still have expandable properties. bubble performance.

Description

technical field [0001] The invention relates to a preparation method of a low-temperature expandable graphite / polymer foam material. Background technique [0002] Polymer foaming technology is a relatively new molding technology. It mixes the gas into the polymer in the form of a dispersed phase (closed cell structure) or a second continuous phase (open cell structure) into a so-called foamed material (polymer-gas composite). In addition to the general effect of reducing material usage and cost, this material also has many special properties, such as significantly improved ability to absorb shock and vibration energy. So far, there are two kinds of blowing agents used in polymer foaming. One is a chemical foaming agent, which releases gas through a chemical reaction. The characteristic is that the foaming material can be placed for a long time, but the cost is high; the other is a physical foaming agent, which is released by the external environment (such as temperature) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/232C08L23/06C08L23/12C08L25/06C08L27/06
Inventor 张兴华吴会兰
Owner GUANGDONG UNIV OF TECH
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