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Low-temperature energy-saving leadless solder paste special for tuners

A lead-free solder paste, tuner technology, applied in the direction of welding medium, welding/cutting medium/material, metal processing equipment, etc., can solve problems such as excessive solder paste drop, short circuit, reliability hazards, etc., to achieve qualified The effect of rate and safety performance

Inactive Publication Date: 2011-04-06
SHENZHEN HANBAO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the production process of the tuner, when the above-mentioned existing lead-free solder paste is used in the installation process of through-hole components, too much solder paste often falls off, resulting in virtual soldering and there are a large number of tin beads in the flux residue after soldering, which is harmful to the product. Potential damage to future reliability, especially between pads with extremely small spacing, there is a possibility of short circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A low-temperature energy-saving lead-free solder paste for tuner production, the components and proportions of which are prepared according to the following methods.

[0026] (1) Preparation of solder paste:

[0027] High Viscosity Tetrahydro Rosin 30% Ammonium Succinate 2.0%

[0028] Low viscosity Tetrahydrorosin 25% Cyclohexylamine Hydrobromide 0.3%

[0029] Modified hydrogenated castor oil 3% Diethylene glycol ether solvent 39.7%

[0030] Put the above materials into a stainless steel reactor, stir, heat to 130°C to dissolve at a constant temperature, and then rapidly cool to room temperature. Then move it into the refrigerator, let it stand at 0-5°C for 24 hours, thaw it to room temperature for 4 hours, grind it in a three-roll machine, and set it aside.

[0031] (2) Solder paste preparation:

[0032] Soldering paste: 11% Sn42Bi58 tin powder: 89%

[0033] Fully knead in a double planetary kneader for 30 minutes under the condition of evacuating and filling with...

Embodiment 2

[0036] A low-temperature energy-saving lead-free solder paste for tuner production, the components and proportions of which are prepared according to the following methods.

[0037] (1) Preparation of solder paste:

[0038] High Viscosity Tetrahydrorosin 39% Ammonium Succinate 4.0%

[0039] Low viscosity Tetrahydrorosin 15% Cyclohexylamine Hydrobromide 0.6%

[0040] Modified hydrogenated castor oil 6% Diethylene glycol ether solvent 35.4%

[0041] Manufacturing method is the same as embodiment 1.

[0042] (2) Solder paste preparation:

[0043] Soldering paste: 11% Sn42Bi58 tin powder: 89%

[0044] Manufacturing method is the same as embodiment 1.

[0045] When the prepared solder paste is used in the assembly and welding process of the tuner circuit board, the amount of solder paste falling during the installation process of the plug-in components is very small; there are no tin beads in the flux residue.

Embodiment 3

[0047] A low-temperature energy-saving lead-free solder paste for stencil printing produced by a tuner, the composition and proportion of which are prepared according to the following method.

[0048] (1) Preparation of solder paste:

[0049] High Viscosity Tetrahydro Rosin 35% Ammonium Succinate 3.0%

[0050] Low viscosity Tetrahydrorosin 20% Cyclohexylamine Hydrobromide 0.5%

[0051] Modified hydrogenated castor oil 5% Diethylene glycol ether solvent 36.5%

[0052] Manufacturing method is the same as embodiment 1.

[0053] (2) Solder paste preparation:

[0054] Soldering paste: 11% Sn42Bi58 tin powder: 89%

[0055] Manufacturing method is the same as embodiment 1.

[0056] (3) Performance test

[0057] Viscosity: 192Pa.s, TI value: 0.52, viscosity non-recovery rate: 1.8%,

[0058] Viscosity: 118gf

[0059] Tin bead test on ceramic sheet: no tin bead.

[0060] When the prepared solder paste is used in the tuner circuit board assembly stencil printing and welding proc...

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Abstract

The invention aims at solving the problems of the lead-free solder paste used in the production of tuners such as solder paste shedding, rosin joint, plenty of solder beadings existing in postwelding soldering flux residues, and the like, which are likely to happen in production, and provides a low-temperature energy-saving lead-free solder paste specially used for tuners; the low-temperature energy-saving lead-free solder paste is composed of Sn42Bi58 solder powder and soldering flux paste; the soldering flux paste contains the components with the following weight percentage: 30-40% of high-viscosity tetrahydroabietic acid, 15-25% of low-viscosity tetrahydroabietic acid, 3-6% of modified hydrogenated castor oil, 2-4% of ammonium salt of butanedioic acid, 0.3-0.6% of cyclohexylamine hydrobromide and 35-45% of diethylene glycol solvent. The low-temperature energy-saving lead-free solder paste of the invention can effectively lower the amount of the solder paste shedding in the mountingprocedure of plug-in mounting elements, reduce the solder beadings appearing in soldering flux residues, improve the qualification rate and safety performance of products and can save electricity by about 18% when applied to a tuner production line.

Description

technical field [0001] The invention relates to a welding material for electronic printed circuit board assembly, in particular to a low-temperature energy-saving lead-free solder paste specially used for tuners. Background technique [0002] The existing lead-free solder paste for assembly of electronic printed circuit boards is generally composed of tin powder and solder paste. As a low-temperature lead-free solder paste for tuners, Sn42Bi58 tin powder is generally used as raw material, and the solder paste is basically composed of 35-50 Mass % resin (such as disproportionated rosin, hydrogenated rosin, etc.), 1-10 mass % thixotropic agent (such as modified hydrogenated castor oil, fatty acid glyceride, etc.), 35-55 mass % solvent (such as ethylene glycol butyl Ether, diethylene glycol butyl ether, etc.), 1.5-5% by mass of active agents (such as succinic acid, diethylamine hydrobromide, etc.). [0003] The production process of the tuner is divided according to the produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/36
Inventor 冼志雄
Owner SHENZHEN HANBAO TECH