A thermally stable water soluble solder paste

Abstract Water soluble solder paste developed using T7 powder particles revealed good solderability when printed on copper, tin, gold flash nickel plated surfaces and on reflow as well. Its cross-section showed absence of voids, good wetting and soldering to the plated surfaces with angle of contact from 42° to 84° on reflow. All the solder interface are integral with pad/substrate surfaces and revealed formation of tin based intermetallics. T7 solder powder processed using Welco technology showed spherical, clean, smooth, un-agglomerated powder particles with the size range of 2 to 12μm. The developed solder paste is used for fine pitch applications.

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Preparation of thermally stable well-dispersed water-soluble CdTe quantum dots in montmorillonite clay host media

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2011.11.044 ◽

2012 ◽

Vol 368 (1) ◽

pp. 139-143 ◽

Cited By ~ 22

Author(s):

Yuan-Cheng Cao

Keyword(s):

Quantum Dots ◽

Montmorillonite Clay ◽

Water Soluble ◽

Cdte Quantum Dots ◽

Thermally Stable

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Preparation of PEG-rosin derivative for water soluble rosin flux

Soldering & Surface Mount Technology ◽

10.1108/ssmt-08-2015-0025 ◽

2016 ◽

Vol 28 (4) ◽

pp. 188-200 ◽

Cited By ~ 1

Author(s):

Kanlaya Phaphon ◽

Sumrit Wacharasindhu ◽

Amorn Petsom

Keyword(s):

Large Scale ◽

Gel Permeation Chromatography ◽

Water Soluble ◽

Molar Ratio ◽

Scale Production ◽

Solder Paste ◽

Scanning Calorimetry ◽

Corrosion Properties ◽

Synthetic Process ◽

Content Type

Purpose This study aims to synthesize polyethylene glycol (PEG)-rosin derivatives from rosin and PEG for the production of solid soldering fluxes. The PEG-rosin derivatives would be water soluble, and the resulting solid soldering fluxes would have reasonable wetting ability when combined with a low-halide-content activator. Design/methodology/approach This paper presents a synthetic process for PEG-rosin derivatives. The reaction conditions (including catalyst type, catalyst concentration, reaction temperature and PEG type) were optimized for the synthesis of PEG-rosin derivatives. The chemical and physical properties of PEG-rosin derivatives were characterized by Fourier transform infrared spectroscopy, carbon-13 nuclear magnetic resonance spectrometry, differential scanning calorimetry and gel permeation chromatography. The production and characteristics of water-soluble rosin fluxes (WSRFs) were studied according to the standards of the Japanese Industrial Standards (JIS) Committees. Findings WSRs were successfully synthesized from rosin and PEG using 2 per cent ZnO as a catalyst, with a 2:1 molar ratio of rosin:PEG at 250°C over 9 h. The resulting WSRs were completely soluble in water. As the PEG3000-rosin had the highest melting point (55.2°C), it was chosen for the preparation of the WSRFs. Activators such as succinic acid, glutaric acid, ethylamine hydrochloride and diethylamine hydrobromide were selected for use in the production of the fluxes. It was found that WSRF 09 and WSRF 04 gave the best performance with the lead-free Sn-0.7Cu solder alloy in terms of good solderability, low halide content (less than 1,500 ppm), high insulation resistance and low corrosion. These fluxes were applied to produce solder pastes with Sn-3.0Ag-0.5Cu alloy and they passed the performance tests as expected for solder paste. Research limitations/implications Further studies are necessary on large-scale production and to compare the performance of these fluxes to those from conventional water-soluble fluxes currently available in the market. Application of these fluxes on low-temperature solder alloys such as SnZn and SnBi (Ren et al., 2016) worth further study. Originality/value The classification of flux systems according to the JIS 3283 standard does not specify PEG-rosin derivatives in the flux; nevertheless, ranking of the flux systems based on the halide content and corrosion properties of activators would be useful information when selecting flux systems for electronics soldering in water-washable applications. The application of these fluxes in solder paste gave very promising results and is worth investigating into more detail, as well as field test.

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Water-soluble green-emitting carbon nanodots with enhanced thermal stability for biological applications

Nanoscale ◽

10.1039/d0nr09131f ◽

2021 ◽

Vol 13 (7) ◽

pp. 4301-4307

Author(s):

Waheed Ullah Khan ◽

Liying Qin ◽

Abid Alam ◽

Ping Zhou ◽

Yong Peng ◽

...

Keyword(s):

Thermal Stability ◽

Hydrothermal Method ◽

High Temperatures ◽

Water Soluble ◽

Carbon Nanodots ◽

Biological Applications ◽

Thermally Stable ◽

Stable Performance

Water soluble and thermally stable green emitting CNDs are prepared via a hydrothermal method. The as-obtained CNDs demostrate stable performance in T-ca cells at high temperatures.

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Synthesis, application and investigation of structure–thermal stability relationships of thermally stable water-soluble azo naphthalene dyes for LCD red color filters

Dyes and Pigments ◽

10.1016/j.dyepig.2010.07.008 ◽

2011 ◽

Vol 89 (1) ◽

pp. 1-8 ◽

Cited By ~ 40

Author(s):

Young Do Kim ◽

Jung Hyun Cho ◽

Chong Rae Park ◽

Jae-Hong Choi ◽

Chun Yoon ◽

...

Keyword(s):

Thermal Stability ◽

Water Soluble ◽

Thermally Stable ◽

Red Color ◽

Color Filters

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The Chemical Design and Optimisation of a Non‐rosin, Water‐soluble Flux Solder Paste

Soldering & Surface Mount Technology ◽

10.1108/eb037791 ◽

1992 ◽

Vol 4 (2) ◽

pp. 30-34 ◽

Cited By ~ 2

Author(s):

J. Frazier ◽

R. Jackson ◽

R. Reich ◽

R. Enno ◽

W. Ables ◽

...

Keyword(s):

Water Soluble ◽

Solder Paste ◽

Chemical Design

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Thermally stable imidazoline-based sulfonate copolymers for enhanced oil recovery

RSC Advances ◽

10.1039/c5ra15434k ◽

2015 ◽

Vol 5 (104) ◽

pp. 85165-85173 ◽

Cited By ~ 7

Author(s):

Shaohua Gou ◽

Shan Luo ◽

Tongyi Liu ◽

Hong Xia ◽

Dong Jing ◽

...

Keyword(s):

Thermal Stability ◽

High Temperature ◽

Enhanced Oil Recovery ◽

Oil Recovery ◽

Water Soluble ◽

Thermally Stable ◽

Excellent Thermal Stability

Novel water-soluble imidazoline-based sulfonate copolymers were synthesized; the copolymers possess excellent thermal stability and outstanding potential for application in high-temperature oil recovery.

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