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A method to increase the processing rate of laser-assisted supercritical fluid polymer materials

A polymer material and supercritical fluid technology, which is applied in the field of improving the processing rate of laser-assisted supercritical fluid polymer materials, can solve problems such as difficult control and inability to achieve precision machining, and achieve the effect of improving precision machining efficiency

Inactive Publication Date: 2017-12-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the concentration of the aqueous caustic soda solution is high, the chemical hydrolysis process is difficult to control, and precision machining cannot be realized; and when the concentration of the aqueous caustic soda solution is low, since the surface of most polymer materials is hydrophobic, low-concentration chemical reagent catalysts (for example, NaOH aqueous solution ) is not easy to break the chemical bond on the surface of the material, therefore, it is necessary to use an environmentally friendly (miscible with NaOH aqueous solution) chemical solvent to wet the surface of the polymer material

Method used

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  • A method to increase the processing rate of laser-assisted supercritical fluid polymer materials
  • A method to increase the processing rate of laser-assisted supercritical fluid polymer materials

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Effect test

Embodiment 1

[0023] The embodiment of the present invention provides a method for improving the precision machining efficiency of laser-assisted supercritical fluid polymer materials, see figure 1 and figure 2 , the method includes the following steps:

[0024] 101: Make a sealable container with a quartz glass window7;

[0025] During specific implementation, according to the requirements of the quartz glass window 3 in practical applications, the surface is smooth and clean, and the parallelism is good; the sealing method of the container 7 can use rubber pads, etc., and the fixing method of the polymer material sample to be processed, the embodiment of the present invention does not address this Do limit.

[0026] 102: Fix a piece of polymer material sample 4 to be treated on the inner surface of the quartz glass window 3, inject an appropriate amount of a mixed solution 5 of low-concentration NaOH aqueous solution and ethanol into the sealable container 7, and seal it; Laser beam 1...

Embodiment 2

[0034] Combine below figure 2 The scheme in embodiment 1 is introduced in detail, see the following description for details:

[0035] A piece of polymer material sample to be processed-polylactic acid sheet 4 is fixed on the inner surface of the quartz glass window 3, secondly, a laser that can see through the sealable container 7 and the polymer material sample 4 is selected-visible or An infrared laser is used as a laser source; take the mixed solution 5 of 0.25M NaOH aqueous solution and absolute ethanol (1:1 volume ratio) as an example.

[0036] The ultra-short pulse laser adopts a pulse width of 10-10000 femtoseconds, a repetition rate of 0.5-50 MHz, and a power of 1-20 W; the ultra-short pulse laser passes through a polylactic acid sheet 4 focused on an objective lens 2 with a numerical aperture of 0.05-1.4, and On the interface of mixed solution 5 of 0.25M NaOH aqueous solution and absolute ethanol (1:1 volume ratio).

[0037] When the ultrashort pulse laser intensit...

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Abstract

The invention discloses a method for increasing the laser-assisted processing rate for supercritical fluid and high molecular materials. The method includes the following steps that a mixed solution prepared from a low-concentration caustic soda aqueous solution of a proper ratio and a chemical solvent capable of being mixed with the caustic soda aqueous solution is used as a supercritical fluid solvent, the low-concentration caustic soda aqueous solution is used as a catalyst for hydrolysis of the supercritical fluid, and the chemical solvent is used for soaking the surfaces of the high molecular materials; and a visible / infrared pulse laser is selected as a laser source, the pulse laser is made to focus on the interface between the high molecular materials and the mixed solution through an objective lens, when the energy flux density of the ultrashort pulse laser is greater than or equal to the threshold energy flux density value, the high molecular materials in the focus point are subjected to supercritical-state chemical hydrolysis, and along with moving of the pulse laser focus point, micro-processing is conducted on the high molecular materials, so that the laser-assisted processing efficiency for the supercritical fluid and the high molecular materials is improved under the effect of the mixed solution. The method can improve laser-assisted precision processing efficiency for the supercritical fluid and the high molecular materials.

Description

technical field [0001] The invention relates to the technical field of precision processing of polymer materials, in particular to a method for increasing the processing rate of laser-assisted supercritical fluid polymer materials. Background technique [0002] Polymer materials have good transparency and biocompatibility, and have great application potential in the fields of optomechanical systems and biomedical microdevices. Laser processing is a kind of non-contact processing, and has less influence on the surrounding area of ​​processing, so it is widely used in the field of industrial processing. However, laser processing capability depends on the absorption properties of polymer materials for laser light. Most transparent polymer materials are weak absorbers, and the absorption band is in the vacuum ultraviolet region below 193nm. If the incident laser light is strongly absorbed by the polymer material, the chemical bond can be broken directly, and the polymer materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/60B23K26/362B23K26/402
CPCB23K26/361B23K26/402B23K26/60
Inventor 贾威于俭刘博文柴路胡明列王清月
Owner TIANJIN UNIV
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