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Method for bonding plastics and method for releasing bond in the plastic composite and plastic composite

A technology of composites, plastics, applied in the field of chemistry

Inactive Publication Date: 2014-12-17
LEIBNIZ INST FUR POLYMERFORSCHUNG DRESDEN EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The disadvantage of this method is that, on the one hand, a direct flow of current is required and an extremely precise control of the flow of current must be required in order to maintain sufficient heating, since the plastic surfaces in the weld are not in direct contact with each other, and Thermal damage to the plastic must be avoided as much as possible

Method used

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  • Method for bonding plastics and method for releasing bond in the plastic composite and plastic composite
  • Method for bonding plastics and method for releasing bond in the plastic composite and plastic composite
  • Method for bonding plastics and method for releasing bond in the plastic composite and plastic composite

Examples

Experimental program
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Effect test

Embodiment 1

[0079] Samples of plastic moldings with a size of 1 cm x 1 cm made of bisphenol A-based polycarbonate (PC) should be compared with 1 cm x 1 cm samples of plastic moldings made of polyvinylamine (PVAm) functionalized with amino groups. Plastic molded body connection. The glass transition temperature of polycarbonate (PC) is about 145°C, while that of polyvinylamine (PVAm) is about 130°C.

[0080] A ring made of gold is applied on a plastic body made of PC, the dimensions are: outer diameter 5 mm, ring thickness (Ringdicke) 1 mm, ring height 150nm. A plastic coverage of 10% is thereby achieved.

[0081] The plastic bodies to be joined made of PC and PVAm were then brought into contact with each other in the area where the rings were located, and the two bodies were exposed to an electromagnetic pulse of 60 T for 7 ms.

[0082] The coupling reaction triggered after reaching the activation energy proceeds as follows:

[0083]

[0084] Diagram 1

[0085] Bisphenol-A = Bisp...

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Abstract

The invention relates to a method for bonding plastics (1, 2), a method for releasing a bond in the plastic composite and a plastic composite. The aim of the present invention is to provide a method by which a bonding of the regions of the plastics (1, 2) that are in direct contact is accomplished. This aim is achieved by a method for bonding plastics (1, 2) in which materials (3) which contain at least one electrically conductive material and only partially cover the plastics (1, 2) are applied to at least one of the plastics (1, 2) to be bonded, then the plastics (1, 2) are brought into contact with one another, at least in the region with the materials, and after that at least this region is exposed at least once to an alternating electromagnetic field (4).

Description

technical field [0001] The invention relates to the field of chemistry and relates to a method for joining plastics, for example in numerous industrial applications such as in the automotive industry, in aircraft construction and in the production of consumer goods and consumables, in the packaging industry for the improvement of semi-finished products and components The method adopted by the use performance. The invention also relates to a method for disconnecting plastic composites, such as is required for safety technology or in recycling processes. Background technique [0002] For the joining of plastic surfaces, various techniques are known. Particularly important here is plastic welding. [0003] When welding plastic boundary layers, thermal energy must in principle be introduced into the boundary layer between two pieces of plastic. Properties of boundaries like accessibility and geometry are key criteria for various approaches. For the known plastic welding tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C65/36B29C65/76
CPCB29K2705/14B29K2505/14B29C65/362B29C65/3676B29C65/76B29C66/1122B29C66/30341B29C66/71B29C66/73921B29C65/3628B29C65/3608B29C65/5057B29C66/45B29C66/73118B29C66/73161Y10T156/1158Y10T428/31507C08J2369/00C08J2439/02B29K2069/00B29K2067/00B29C65/14B32B27/08B32B27/28B32B27/30B32B37/06B32B38/0008B32B38/10B32B43/006B32B2250/03B32B2250/24B32B2307/202C08J5/121
Inventor 科迪莉亚·齐默勒格拉尔德·施泰纳格特·海因里希
Owner LEIBNIZ INST FUR POLYMERFORSCHUNG DRESDEN EV
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