Method for improving liquidity of viscoelastic fluid via high frequency ultrasounds

A high-frequency ultrasonic and viscoelastic technology, applied in chemical instruments and methods, semiconductor/solid-state device manufacturing, shaking/oscillating/vibrating mixers, etc., can solve the problem of reducing fluid viscoelasticity and irreversible changes in the chemical properties of viscoelastic fluids , high cost and other issues, to achieve the effect of maintaining fluid stability
CN104841322AInactive Publication Date: 2015-08-19GUANGDONG UNIV OF TECH
4 Cites 1 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG UNIV OF TECH
Publication Date
2015-08-19
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The present invention discloses a method for improving the liquidity of a viscoelastic fluid via high frequency ultrasounds. High frequency ultrasonic waves are introduced into the viscoelastic fluid by utilizing an ultrasound amplitude-change pole supplied with power by an ultrasonic power supply to generate a large amount of bubbles, and the bubbles are detonated by shear movement generated by the ultrasonic amplitude-change pole, so that molecular chains wound together are scattered, the viscoelasticity of the viscoelastic fluid is lowered, and the fluidity of the viscoelastic fluid is improved. The method lowers the viscoelasticity of the fluid by way of scattering the molecular chains wound together, but does not change the molecular structure, therefore, the chemical property of the fluid is not changed; Scattered molecular chains can be recovered in the winding state along with Brownian motion step by step after being poured, so that the high viscoelasticity of the viscoelastic fluid can be recovered, and connected channels are better protected. The method lowers the viscoelasticity of the viscoelastic fluid on the basis of the high frequency ultrasonic shear movement without high temperature, as a result, extra thermal stress and transformation are not introduced into a chip in a pouring process.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of electronic packaging, and relates to a method for improving the fluidity of viscoelastic fluid through high-frequency ultrasound. Background technique

[0002] After the chip is interconnected, it needs to be potted with a highly viscoelastic viscoelastic fluid, so that the electrical interconnection channel of the chip is isolated from the air and protected. During the potting process, because the viscoelasticity of the viscoelastic fluid is too large, the fluidity of the viscoelastic fluid is poor and the elasticity is strong, and it is difficult to be extruded or sprayed out, thus causing difficulty in potting. Especially when the jet dispensing technology is used for potting, excessive viscoelasticity of the viscoelastic fluid will cause the viscoelastic fluid to accumulate in the nozzle, which will not only affect the consistency of the potting quality, but even cause nozzle blockage in severe cases....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More