WO2006070797A1 - 鉛フリーハンダ用フラックスおよびソルダーペースト - Google Patents
鉛フリーハンダ用フラックスおよびソルダーペースト Download PDFInfo
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- WO2006070797A1 WO2006070797A1 PCT/JP2005/023890 JP2005023890W WO2006070797A1 WO 2006070797 A1 WO2006070797 A1 WO 2006070797A1 JP 2005023890 W JP2005023890 W JP 2005023890W WO 2006070797 A1 WO2006070797 A1 WO 2006070797A1
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- lead
- ester
- flux
- weight
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C13/00—Alloys based on tin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/26—Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/26—Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
- B23K35/262—Sn as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3612—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with organic compounds as principal constituents
- B23K35/3613—Polymers, e.g. resins
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
- B23K35/025—Pastes, creams, slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3612—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with organic compounds as principal constituents
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3457—Solder materials or compositions; Methods of application thereof
- H05K3/3485—Applying solder paste, slurry or powder
Definitions
- the present invention relates to a flux for lead-free solder (hereinafter sometimes simply referred to as flux) and a solder paste containing the flux.
- soldering is generally performed to surface-mount electronic components such as capacitors on a conductor pattern on a circuit board.
- Various characteristics are required when soldering. For example, suppression of “solder ball” formation is important.
- the solder ball is a phenomenon in which the solder paste printed on the conductor pattern spreads excessively when reflowed and melted, and fine ball-like solder appears near the periphery of the sag. If the amount of solder balls increases, bridges and short circuits are likely to occur, and the reliability of the mounting board is significantly impaired.
- solder typified by Sn—Ag is difficult to wet with a base substrate (particularly a copper-based metal substrate or ceramic substrate) in a molten state. For this reason, voids on the order of millimeters (hereinafter referred to as “void voids”) may occur at the solder joint interface (particularly the direct bond joint interface). The reliability of the mounting substrate is also impaired by the voids.
- the present invention does not impair normal soldering characteristics, such as solder balls are less likely to occur, and the force is also referred to as "bubble void” or “void void” (hereinafter, both are simply referred to as "void”).
- the main purpose is to provide a flux for lead-free solder that can reduce the amount of generation.
- an object of the present invention is to provide a solder paste that uses the flux and can significantly reduce the amount of voids generated.
- void voids are abundant in oxalic acids, which are the base rosin components of fluxes. This is presumed to be caused by the low molecular weight material force contained in the molten solder remaining at the bonding interface between the molten solder and the base substrate (ceramics, etc.).
- the present inventors focused on the suppression of gas generation for the “bubble void”, and an ester composition having excellent thermal stability obtained by reacting succinic acid with a polyhydric alcohol. It has been found that this can be solved by flux containing a specific amount of base as a base fat.
- ester compositions used as a base resin are oxalic acids, and the relationship with "soft point (K)"
- soft point (K) In the case of an ester composition in which the content (% by weight) of a component having a molecular weight of 300 or less is previously removed to a specific amount or less, It has been found that the problem can be solved by using a flat containing “succinic acid” obtained by removing the content (% by weight) of the following components in advance until the content is below a specific amount. (Hereinafter, the “component having a molecular weight of 300 or less” may be simply referred to as “low boiling point”.)
- the present invention relates to a lead-free soldering flux containing 6 to 55% by weight of a polyhydric alcohol ester (al) of succinic acid as the base rosin (A).
- the ester (al) is prepared so that the ratio (wt% ZK) of the content (wt%) of the component having a molecular weight of 300 or less to the softening point (K) is 0.004 or less. I prefer to be there.
- the succinic acid forming the ester (al) is preferably a Diels-Alder adduct of a, j8-unsaturated carboxylic acid and succinic acid.
- the base rosin (A) further includes oxalic acids (a2).
- the succinic acid (a2) was prepared so that the ratio (wt% ZK) of the content (wt%) of the component having a molecular weight of 300 or less and the softening point (K) was 0.004 or less. I prefer to be something.
- the succinic acid (a2) preferably contains a polymerized rosin and a Diels-Alder adduct of Z or a, ⁇ -unsaturated carboxylic acid and succinic acid.
- the total solid weight of the ester (al) and the succinic acid (a2) is preferably 10 to 60% by weight.
- the solid content weight of the ester (al) in the total solid content weight of the ester (al) and the succinic acid (a2) is preferably 60 to 88% by weight.
- the lead-free solder flux of the present invention preferably further contains an activator (B), an additive (C) and a solvent (D).
- the polyhydric alcohol is preferably a dihydric or higher alcohol.
- the polyhydric alcohol is preferably a trihydric alcohol and / or a tetrahydric alcohol.
- the polyhydric alcohol is preferably glycerin and / or pentaerythritol.
- the present invention also relates to a solder paste containing the lead-free solder flux and lead-free solder powder.
- the flux according to the present invention contains, as an essential component, an ester (al) obtained by reacting oxalic acid with a polyhydric alcohol as a base resin (A).
- Examples of the succinic acid constituting the ester (al) include various known natural rosins such as gum rosin, wood rosin and tol oil rosin, and various derivatives of the natural rosin.
- the natural rosins and the derivatives can be used alone or in combination.
- the natural rosins are mainly composed of various oxalic acids such as abietic acid, levopimaric acid, neoabietic acid, parastrinic acid, pimaric acid, isopimaric acid, sandaracopimaric acid and dehydroabietic acid.
- the natural rosins have an acid value of usually 160 to 190 mgKOHZg, preferably about 170 to 180 mgKOHZg (according to JIS-K5902, hereinafter the unit is abbreviated), and the soft spot is usually 340 to 450K. About 345 to 383 mm.
- the softening point is the value (° C) measured according to JIS-—5903 converted to the absolute temperature ( ⁇ ). The same shall apply hereinafter.)
- Examples of the derivatives include disproportionate, hydrogenated product, dehydrogenated product, formyl product, polymer (polymerized rosin) of natural rosin, and a, j8-unsaturated carboxylic acid.
- Examples include Diels / Alder-attached products with fatty acids (hereinafter referred to as “Deals ⁇ Alder-containing products”).
- the derivative has an acid value of usually about 140 to 400, preferably about 145 to 380.
- the soft spot is usually about 340 to 480 K, preferably about 373 to 443 K.
- the polymerized rosins contain about 30 to 80% by weight of the bisuccinic acid bismuthed, have an acid value of usually about 100 to 300, preferably about 140 to 170, and usually have a softening point.
- the composition is about 363 to 450 mm, preferably about 373 to 440 mm.
- Polymerized rosins can be obtained as commercially available products such as “CP-No. 140 (manufactured by Takehira Prefectural Hayashi Chemical Industries Co., Ltd.)” and “TX295 (manufactured by Arizona Chemical Co., Ltd.)”.
- the Diels-Alder adduct is a composition containing a compound obtained by Diels-Alder addition of a, ⁇ -unsaturated carboxylic acids to the succinic acid contained in succinic acids.
- Examples of the ⁇ , j8-unsaturated carboxylic acids include various known ones.
- OC, ⁇ unsaturated monocarboxylic acids such as acrylic acid and methacrylic acid
- a ⁇ -unsaturated dicarboxylic acids such as crotonic acid, itaconic acid, maleic acid, maleic anhydride, fumaric acid, muconic acid, citraconic acid, etc.
- Acids These neutralized salts can be exemplified.
- the neutralized salt examples include organic salts such as ammonia, ammonium carbonate, monoethylamine, monobutylamine, dimethylamine, dibutylamine, trimethylamine, and jetylamine, and metal salts such as calcium, sodium, and potassium. .
- the neutral salt is preferably the organic salt.
- the Diels-Alder cake usually has an acid value of about 20 to 400, preferably about 100 to 380, particularly preferably 200 to 360, and the soft spot is usually about 363 to 453 mm.
- the composition is preferably about 373 to 443 mm, particularly preferably 383 to 433 mm.
- the Diels' alder-equipped product is available as a commercial product (all manufactured by Arakawa Chemical Co., Ltd.) such as "Pine Crystal Series”, “Sakai Series”, and “Marquide Series”. wear.
- the ester (al) is a composition obtained by reacting the succinic acid with a polyhydric alcohol, and contains an ester compound having excellent thermal stability.
- Various known alcohols can be used as the polyhydric alcohol constituting the ester (a1).
- dihydric alcohol ethylene glycol, diethylene glycol, triethylene glycol, tripropylene glycol, 1, 2 dihydroxypropane, 1, 3 -Dihydroxypropane, 1,2 dihydroxybutane, 1,3 dihydroxybutane, 2,3-dihydroxybutane, neopentyl glycol, 1,4 bis-hydroxymethyl-octane hexane, 1,6 hexanediol, otaten glycol, Divalent aliphatic alcohols such as polyethylene glycol; 2, 2 bis (4-hydroxydiphenyl) methane, 2, 2 bis (4 hydroxyphenol) propane, 2, 2 bis (4 hydroxy-1-3-methylphenol) Propane, 2, 2 bis (4 hydroxy-1-3-tert-butylphenol) propane, 2, 2 bis (4 hydroxy-1,3,5 dimethylphenol) propane, 2, 2 bis (4 hydroxy-1,3,5) Bisphenols such as
- alcohols examples include divalent alicyclic alcohols corresponding to the divalent aromatic alcohols. These can be used alone or in combination of two or more.
- trihydric alcohol examples include glycerin, glyceronole, 1, 2, 3 protontriol, 1, 2, 4 —butanetriol, 3-methylpentane—1, 3, 5 triol, 1, 2 , 6 hexanetriol, 1, 3, 5 tris (2 hydroxyethyl) cyanuric acid and other trivalent aliphatic alcohols.
- tetravalent alcohol examples include tetravalent aliphatic alcohols such as diglycerin and pentaerythritol. These can be used alone or in combination of two or more.
- pentavalent or higher alcohol for example, dipentaerythritol can be used.
- the dihydric alcohol is preferable from the viewpoint of void suppression (particularly, the “bubble void”).
- the trihydric alcohol and cocoon or tetrahydric alcohol are preferable.
- the glycerin and cocoon or pentaerythritol are preferable.
- the ester (al) is used as succinic acid, and a polyhydric alcohol and Preferred are esters using glycerin and z or pentaerythritol. Since the ester is difficult to crystallize compared to succinic acid, the use of a flux based on this ester does not increase the viscosity over time, etc. is there.
- the method for producing the ester (al) is not particularly limited, and various known means can be used. Specifically, for example, the succinic acid and the polyhydric alcohol are charged into a reaction vessel, the inside of the system is heated to about 150 to 300 ° C., and the generated water is removed from the system while being removed from the system. It can be obtained by completing the reaction when it becomes a physical property. The reaction is usually carried out under atmospheric pressure.
- the reaction is preferably carried out under an inert gas stream such as nitrogen or a rare gas.
- the charging ratio of the oxalic acid to the polyhydric alcohol is such that the equivalent ratio of the oxalic acid to the polyhydric alcohol (COOH (eq): OH (eq)) is about 1: 1.5 to 1: 0.7. It is a range.
- an ester soot catalyst can be used.
- acid catalysts such as acetic acid and p-toluenesulfonic acid; alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide; hydroxides calcium and hydroxides magnesium Alkaline earth metal hydroxides; alkaline earth metal oxides such as calcium oxide and magnesium oxide; and the like.
- alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide
- alkaline earth metal oxides such as calcium oxide and magnesium oxide
- succinic acid as a raw material of ester (al) may be pretreated by various purification methods described later! /.
- ester (al) is usually 98 to 90 weight 0/0 mm, preferably a composition containing 95 to 92 by weight% of Esuterui ⁇ thereof.
- the acid value is usually about 0.1 to 50, preferably about 0.1 to 25, and particularly preferably 1 to 20.
- the softening point is usually about 343 to 453 K, preferably about 353 to 443 K, and particularly preferably 363 to 433 K.
- the hydroxyl group value is usually about 0 to 60, preferably about 1 to 40.
- the content (% by weight) of the ester compound in the ester (al) can be determined by measurement by a known means such as gas chromatography. However, other GPC devices and columns may be used as long as the content can be substantially determined. More simply, the acid value of the ester (al) is divided by the acid value of the succinic acid used as a raw material. Can be determined more.
- the low boiling point is considered as one of the factors of void formation.
- the ester (al) is treated by various purification means as exemplified later, and the low-boiling content (wt%) in the treated ester (al)
- the ratio (weight% ZK) of the later ester (al) to the soft saddle point (K) is 0.004 or less, preferably 0.002 or less, more preferably 0.001 or less, particularly preferably
- the amount of voids generated can be reduced by using a base resin (A) that is not more than 0.0001, most preferably substantially zero (hereinafter referred to as ester (al,)). It can be preferably reduced.
- the ratio (weight% ZK) may be 0.00011 or more, preferably ⁇ 0.0001 or more in consideration of the balance between the time required for the purification treatment, the product cost, and the effect of void suppression.
- the low boiling point content means the volatile cyclic compound generated in various reactions, the catalysts, unreacted substances, impurities, etc. remaining in the reaction system. Since these have a low boiling point and melting point, if they are present in a large amount in ester (al), voids tend to be generated easily.
- the values of the content (wt%) of the low boiling point and the softening point (K) are not particularly limited unless departing from the value of the ratio.
- the softening point (K) of the ester (al) after the treatment is 373K
- the low-boiling content may be 1.5% by weight or less, preferably 0.4% by weight or less.
- the content of low-boiling components should be 1.7% by weight or less, preferably 0.8% by weight or less.
- the void suppression effect can be obtained by setting the ratio (wt% ZK) in such a range. If the softening point of the ester (al) that is slow is high, the low-boiling component will not easily move in the solder paste, so the content of the low-boiling component is relatively high in relation to the softening point (K). However, it is thought that the effect of void suppression can be obtained. On the other hand, if the soft soft spot of the ester (a 1) is low, the low boiling point component tends to move in the solder paste, so the content of the low boiling point component relative to the softening point (K) is relatively low. It is thought that the effect of void suppression can be obtained by reducing the number to a minimum.
- the ester (al) and the ester (al ′) can be used in combination.
- the purification means include (1) heating 'depressurization distillation using reduced pressure', (2) heating 'steam distillation method in which steam heated under normal pressure or reduced pressure is blown into the system, and (3) low boiling point suitable.
- Various known means such as a solvent extraction method using a solvent that can be dissolved in the solvent can be exemplified. These means can be combined as appropriate.
- vacuum distillation for example, it is usually performed at a temperature of about 200 to 300 ° C and a pressure of about 0.01 to 3 kPa.
- the treatment time varies depending on the temperature and pressure.
- the treatment time is not particularly limited as long as it is a time until the ratio value becomes 0.004 or less. Specific conditions are, for example, about 1 hour at 270 ° C. and 0.5 kPa. According to the molecular distillation method using a molecular distillation membrane as the vacuum distillation, the purification effect can be further enhanced.
- steam distillation method for example, it may be carried out by blowing steam pressurized to about 0.1 to 1 MPa at a temperature of about 200 to 300 ° C under normal pressure. Good.
- the treatment time varies depending on the temperature 'pressure and the steam blowing condition, but is not particularly limited as long as the ratio value is 0.004 or less.
- steam at about 270 ° C. under normal pressure and about 0. IMPa may be blown into the system for about 2 hours.
- the ester (al) may be pulverized and extracted with a solvent that suitably dissolves the low boiling point component.
- a solvent that suitably dissolves the low boiling point component.
- the solvent include aliphatic hydrocarbons such as hexane and heptane, alcohols such as methanol and ethanol, and the like.
- ester (al) since ester (al) usually has a wide soft spot temperature range, a high soft spot value increases the viscosity of the distillation system, and low boiling point may be removed from the system by distillation. It will be discharged. On the other hand, when the softening point is low, the viscosity of the distillation system also decreases, and the low boiling point is easily discharged out of the system by distillation. Therefore, the distillation time is determined by the soft spot of the ester (al).
- the content (% by weight) of the low boiling point in the ester (al) can also determine the specific power of the peak area by normal gel permeation mouth chromatography (GPC). Specifically, it can be determined by dividing the total peak area of the low boiling point by the total peak area of the ester (al).
- GPC gel permeation mouth chromatography
- the ester (al,) thus obtained is a composition containing an ester mixture of usually about 98 to 90% by weight, preferably about 95 to 92% by weight, and the acid value is usually 0.1 to Around 50 , Preferably about 0.1 to 25, particularly preferably 0.5 to 20, and the softening point is usually about 343 to 453 K, preferably about 348 to 448 mm, particularly preferably 353 to 443 mm, and a hydroxyl group The value is usually about 0 to 60, preferably about 1 to 45.
- the content (% by weight) of the ester compound in the ester (al ′) can be determined in the same manner as in the ester (al).
- esters (al) and (al ') can be further subjected to various known hydrogenation treatments, disproportionation treatments, dehydrogenation treatments, antioxidant addition treatments, and the like. This is preferable because it improves the heat resistance and color tone of the flux.
- the flux of the present invention usually contains about 6 to 55% by weight of ester (al) and Z or (al ') for the purpose of reducing the generation of the voids (especially "bubble voids"). It is a feature. If the amount is less than 6% by weight, it is difficult to reduce voids. If the amount exceeds 55% by weight, normal solder characteristics such as solder balls tend to be impaired.
- the content is preferably about 9 to 45% by weight, more preferably 18 to 40% by weight.
- succinic acid (a2) used as the base succinate (A) the same succinic acid as the raw material of the ester (al) described above can be used.
- the succinic acid (a2) plays an important role mainly by cleaning the surface of the lead-free solder powder (removing the oxide film) by the action of its active carboxyl group.
- the succinic acid (a2) preferably contains the polymerized rosin and Z or the Diels-Falder adduct. This is because the softening point is in a relatively high temperature range, so that the acid resistance and thermal stability of the flux can be improved.
- the succinic acid (a2) is treated with the various purification means described above, and the low boiling content (wt%) in the treated succinic acid (a2)
- the ratio (wt% ZK) of the succinic acid (a2) to the softening point (K) is about 0.004 or less, preferably about 0.002 or less, more preferably 0.001 or less, particularly preferably 0.00.
- the amount of voids generated can be preferably reduced by using as a base resin (A) a material prepared to be 0001 or less, most preferably substantially zero (hereinafter referred to as succinic acid (a2,)). become.
- the ratio (weight% ZK) is not less than 0.0001 in consideration of the balance between the time required for refining treatment and product cost and the effect of void suppression. Above, preferably 0.00001 or more.
- the low boiling point is the same as described above. If the low boiling point component is present in a large amount in the succinic acid (a2) after the treatment, voids tend to be easily generated.
- the values of the content (wt%) of the low boiling point and the soft spot (K) are not particularly limited unless departing from the value of the ratio.
- the above means (1) to (3) can be used, and these can be combined.
- succinic acid (a2) usually has a wide soft soft spot range, so that the viscosity of the distillation system increases when the softening point is high, and the component of low boiling point is a system depending on the distillation. It becomes difficult to be discharged outside. On the other hand, if the soft spot is low, the viscosity of the distillation system also becomes small, and it tends to be discharged out of the system by component distillation of low boiling point. Therefore, the distillation time is determined by the soft spot of succinic acid (a2).
- the succinic acid (a2 ') thus obtained has an acid value of usually about 160 to 190, preferably about 170 to 180, and a softening point of usually 340, as long as the natural rosin is purified. ⁇ 4 About 50K. Further, if various derivatives of the natural rosins are purified, the acid value S is usually about 140 to 400, and the softening point is usually about 340 to 480K.
- the succinic acid (a2) and the succinic acid (a2,) can be used in combination.
- the succinic acids (a2) and (a2 ') may be further subjected to various known hydrogenation treatments, disproportionation (dehydrogenation) treatments, acidification inhibitor addition treatments, and the like. When applied, it is preferable because the heat resistance and color tone of the flux are improved.
- the base resin (A) can be used in combination as the base resin (A).
- epoxy resin acrylic resin, polyimide resin, polyamide resin, Iron resin
- Synthetic resins such as polyester resin, polyacrylonitrile resin, chloride resin resin, acetate resin resin, polyolefin resin, fluorine resin or ABS resin; isoprene rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), synthetic rubbers such as chloroprene rubber or nylon rubber; elastomers such as nylon elastomer and polyester elastomer; and normal liquids that can also provide succinic acid and monoalcohol (eg, methyl alcohol, ethyl alcohol, butyl alcohol, etc.)
- succinic acid and monoalcohol eg, methyl alcohol, ethyl alcohol, butyl alcohol, etc.
- Examples of the ester can be exemplified. These can be used alone or in combination of two or more. These may be used usually in the
- the ester (al) preferably (al ′)
- succinic acid (a 2) preferably succinic acid (a2 ′)
- the total solid weight of both is usually about 10 to 60% by weight, preferably about 6 to 40% by weight, and more preferably 6 to 30% by weight.
- ester (al) preferably the ester (al ')
- succinic acid preferably the succinic acid
- the solid content weight of the ester (al) (preferably the ester (al ′)) in the total solid content with (a2) (preferably succinic acid (a2 ′)) is usually 60% from the viewpoint of void suppression. It is about -88% by weight, preferably about 70-85% by weight, and more preferably 73-82% by weight.
- any solvent that can be used in the flux can be used without any particular limitation.
- an organic acid compound or an organic amine compound that is activated by preheating during reflow treatment for example, succinic acid, benzoic acid, adipic acid, abietic acid, dartaric acid, palmitic acid, stearic acid, Examples include formic acid, azelaic acid, tributyramine, dioctylamine, and dibutylamine.
- halides activated in the main heat of the reflow treatment for example, ethylamine hydrochloride, methylamine hydrochloride, ethylamine bromate, jetylamine bromate, methylamine bromate, propenediol hydrochloride, allylamamine hydrochloride, 3 Amino-1 propene hydrochloride, N- (3-aminopropyl) methacrylamide hydrochloride, O-acidin hydrochloride, n-butylamine hydrochloride, P-aminophenol hydrochloride or trans-2,3 dibromo-2-butene -1,4-diol and the like.
- examples of compounds that show activity from the preheat to the main heat of the reflow treatment include, for example, quaternary ammonia, lauryltrimethylamine. Examples thereof include molybdenum chloride, alkylbenzil dimethyl ammonium chloride, and tetrabutyl ammonium chloride.
- These activators (B) can be used singly or in combination of two or more.
- the content of the active agent (B) in the flux is usually about 0.1 to 10% by weight, preferably about 0.1 to 5% by weight, and more preferably 0.1 to 3% by weight. When the content is about 0.1 to: LO weight%, soldering characteristics are improved, and the storage stability and electrical insulation of the solder paste tend to be improved.
- additive (C) various known anti-oxidation agents, thixotropic agents, post-sticking agents or anti-skinning agents can be used.
- the antioxidant are 2,6-di-tert-butyl-p-cresol, para-tert-amylphenol, 2,2'-methylenebis (4-methyl 6-tert-butylphenol) and the like.
- thixotropic agents include castor oil, hydrogenated castor oil, beeswax, carnauba wax, stearamide, hydroxystearic acid ethylenebisamide, and the like.
- Acetylene alcohol compounds such as hexyne 2,5 diol, 2, 4, 7, 9-tetramethyl-5 decyne 4,7-diol and 3,6-dimethyl-4-octyne 3,6-diol (Japanese Patent Laid-Open No. 2000-263281) Reference).
- “Posokki” and “skinning” mean that the solder paste viscosity changes due to the reaction of the lead-free solder powder with the activator, etc., or the surface of the solder paste is peeled off. This is a phenomenon that becomes harder as a tension is applied or the viscosity of the solder paste decreases.
- These additives (C) can be used alone or in combination of two or more.
- the content of the additive (C) in the flux is usually about 0.1 to 10% by weight, preferably about 0.1 to 5% by weight, and more preferably 0.1 to 2% by weight.
- the content in the flux is usually about 3 to 20% by weight, preferably 4 to: L0% by weight.
- the content in the soot is usually about 0.1 to 5% by weight, preferably 0.5 to 3% by weight.
- the content is about 0.1 to 5% by weight, there is a tendency that the effect of suppressing the above-mentioned unevenness and skinning becomes sufficient. If it exceeds 5% by weight, no further effect is observed, and soldering characteristics tend to be rather deteriorated.
- solvent (D) various known solvents that can be used for the flux can be used without particular limitation. Specifically, hexyl ether to ethylene glycol mono, diethylene glycol one Honoré monobutyl Honoré ether Honoré, the carboxymethyl Bruno leg Ricoh Honoré, Kishinore glycol octane di O over Honoré, to Echinore, benzyl alcohol, 1, 3-butanediol, ⁇ , 4 Butanediol 2 Alcohols such as mono (2-n-butoxyethoxy) ethanol and terbinol; Esters such as butyl benzoate, ethyl adipate, 2- (2-n-butoxyethoxy) ethyl acetate; Dodecane, tetradecene, etc.
- Hydrocarbons such as methyl 2-pyrrolidone can be exemplified.
- These solvents (D) can be used alone or in combination of two or more. Since the melting temperature of lead-free solder is as described above, it is preferable to have a boiling point in the range of about 150 to 300 ° C, preferably about 220 to 280 ° C. .
- the content of the solvent (D) in the flux is usually about 20 to 85% by weight, preferably about 25 to 85% by weight, more preferably 30 to 80% by weight.
- the flux of the present invention can be obtained by mixing the base resin (A), the activator (B), the additive (C) and the solvent (D) by a known means.
- the conditions (temperature, pressure, etc.) at that time are not particularly limited.
- a planetary mill can be used as the chaotic means.
- the solder paste of the present invention is a cream-like composition obtained by kneading the flux and various known lead-free solder powders by a known mixing means such as a planetary mill.
- Examples of the lead-free solder powder include Sn solder powder, Sn-Ag solder powder, Sn-Cu solder powder, Sn-Zn solder powder, and Sn-Sb solder powder. Specifically, Sn-A g solder powder, Sn-Ag-Cu solder powder, Sn-Ag-Bin solder powder, Sn-Ag-Cu-Bin solder powder, Sn-Ag-Cu-In solder powder, Sn—Ag—Cu—S solder powder and Sn—Ag — Cu— Ni— Ge solder powder.
- the flux of the present invention may be used for conventional lead eutectic soldering depending on the force situation intended for lead-free soldering.
- Examples of the lead eutectic solder powder include Sn—Pb solder powder, Sn—Pb—Ag solder powder, Sn Pb—Bi solder powder, In—Pb solder powder, and Pb—Ag solder powder.
- the solid content weight ratio of the flux to the lead-free solder powder is usually about 5:95 to 20:80, preferably 9:91 to 20:80 for the former: the latter. .
- additive (C), the solvent (D), and other additives can be optionally used as long as they are within such a range.
- a commercially available polymerized rosin ester (trade name “Pencel D-160” manufactured by Arakawa Chemical Industries, Ltd., ester of polymerized rosin and pentaerythritol; acid value; (13) Hydroxyl value 40, softening point 428K, content of component with molecular weight 300 or less is 3.0% by weight, content of component with molecular weight 300 or less (% by weight) ⁇ softening point ( ⁇ ) has a value of 0.007) (Hereinafter referred to as ester (al-1)) was charged and melted at 280 ° C.
- Preparation Example 1 the commercially available polymerized rosin ester was converted to rosin ester (acrylic acid-added light colored rosin (trade name “KE-604” manufactured by Arakawa Chemical Industries, Ltd.) and glycerin ester) (hereinafter referred to as ester).
- ester (acrylic acid-added light colored rosin (trade name “KE-604” manufactured by Arakawa Chemical Industries, Ltd.) and glycerin ester) (hereinafter referred to as ester).
- the ester (al'-9) was obtained in the same manner except that it was changed to (al-9). Table 1 shows the properties.
- succinic acid (a2-1) Charge 100 parts of the above-mentioned commercially available Chinese polymerized rosin (hereinafter referred to as succinic acid (a2-1)) to the same reactor as in Preparation Example 1, and distill under reduced pressure under the same conditions as succinic acid (a2'-1) Got.
- Table 1 shows the properties.
- succinic acid (a2-2) a commercially available Diels-Alder adduct (trade name “KE-604”: Acrylic acid-added light rosin: manufactured by Arakawa Chemical Industries, Ltd.) (hereinafter referred to as succinic acid (a2-2) )) 100 parts were charged, and vacuum distillation was performed under the same conditions to obtain succinic acid (a2'-2). Table 1 shows the properties.
- esters or succinic acids listed in Table 1 were used as they were.
- the solder paste obtained above was printed on a test board for bump formation (a board having a soldering land of 220 m pitch), and soldered by nitrogen reflow, and this was used as a test piece.
- the printing conditions are as follows.
- the bump diameter is about 100 m.
- Metal mask Laser processed product with a thickness of 70 ⁇ m
- Pre-heated rice cake 150-160. 90 seconds with C
- Peak temperature during reflow 235 ° C
- the obtained test piece was irradiated with X-rays to visualize bubble voids generated in the solder bumps.
- the average value (%) of the void diameter m) with respect to the bump diameter (100 m) was determined for 378 joints.
- test piece prepared for the observation of the bubble void was examined with a microscope (product name “VH—
- Example 10 Example 10 To ⁇ 1 Resin (A) Ester (al) or (al-6) (al'-6) (al-6) (al' ⁇ 6) (al 'TM 6) ester) 36.2 36.2 36.2 36.2 36.2 Resin acids (a2) or (a2-l) (aH) (a2' ⁇ l) ( a2-2) (a2-2) (a2'-2) Resin acids (a2 ') 18.2 18.2 18.2 18.2 18.2 18.2 18.2 18.2 Activator (B) V / Pin acid 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 y 1.0 LO 1.0 1.0 1.0 Additive (0 Hardened castor oil 8.0 8.0 8.0 8.0 8.0 (Thiquit D-Pict)
- solder paste was screen printed to a thickness of 0.15 mm, and a test piece It was.
- the printing conditions are as follows.
- Peak temperature during reflow 240 ° C, 220 ° C or higher, approx. 30 seconds
- the obtained test piece was irradiated with X-rays to visualize voids generated at the solder joint interface.
- the ratio (%) of the area (mm 2 ) of the void void to the area (mm 2 ) of the planar electrode was obtained. Evaluation is based on the following criteria.
- the present invention it is possible to reduce the generation amount of the bubble voids and void voids without impairing normal soldering characteristics such as solder balls. Can provide tasting. Further, the solder paste using the flux according to the present invention can be suitably used for the current surface mounting in which the generation of strong voids hardly occurs.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020077014840A KR101125383B1 (ko) | 2004-12-28 | 2005-12-27 | 무연의 땜납 플럭스 및 땜납 페이스트 |
CN2005800451594A CN101090797B (zh) | 2004-12-28 | 2005-12-27 | 无铅焊料用焊剂及焊膏 |
US11/794,203 US20080115861A1 (en) | 2004-12-28 | 2005-12-27 | Flux for Lead-Free Solder and Solder Paste |
JP2006550794A JP5012028B2 (ja) | 2004-12-28 | 2005-12-27 | 鉛フリーハンダ用フラックスおよびソルダーペースト |
EP05822361A EP1834728A4 (en) | 2004-12-28 | 2005-12-27 | LEAD-FREE SOLDER FLUX AND SOLDER PASTE |
Applications Claiming Priority (4)
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JP2004380624 | 2004-12-28 | ||
JP2004-380624 | 2004-12-28 | ||
JP2005141909 | 2005-05-13 | ||
JP2005-141909 | 2005-05-13 |
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WO2006070797A1 true WO2006070797A1 (ja) | 2006-07-06 |
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ID=36614909
Family Applications (1)
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PCT/JP2005/023890 WO2006070797A1 (ja) | 2004-12-28 | 2005-12-27 | 鉛フリーハンダ用フラックスおよびソルダーペースト |
Country Status (7)
Country | Link |
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US (1) | US20080115861A1 (ja) |
EP (1) | EP1834728A4 (ja) |
JP (1) | JP5012028B2 (ja) |
KR (1) | KR101125383B1 (ja) |
CN (1) | CN101090797B (ja) |
TW (1) | TW200633810A (ja) |
WO (1) | WO2006070797A1 (ja) |
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JP2008030105A (ja) * | 2006-07-31 | 2008-02-14 | Arakawa Chem Ind Co Ltd | はんだ付け用フラックス組成物、クリームはんだ組成物および電子部品 |
JP2009285715A (ja) * | 2008-05-30 | 2009-12-10 | Arakawa Chem Ind Co Ltd | はんだフラックスおよびクリームはんだ |
JP2010534139A (ja) * | 2007-07-23 | 2010-11-04 | ヘンケル リミテッド | ハンダ用フラックス |
JP2011131247A (ja) * | 2009-12-24 | 2011-07-07 | Harima Chemicals Inc | アルミニウムろう付け用組成物 |
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JP5790862B1 (ja) * | 2014-12-25 | 2015-10-07 | 千住金属工業株式会社 | やに入りはんだ用フラックス、フラックスコートはんだ用フラックス、やに入りはんだ及びフラックスコートはんだ |
WO2016103526A1 (en) * | 2014-12-26 | 2016-06-30 | University Of Limerick | Soldering flux, solder paste and method for manufacturing soldering flux |
CN104942481B (zh) * | 2015-07-13 | 2017-04-12 | 中国林业科学研究院林产化学工业研究所 | 一种电子焊接用松香衍生物的制备方法 |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2008030105A (ja) * | 2006-07-31 | 2008-02-14 | Arakawa Chem Ind Co Ltd | はんだ付け用フラックス組成物、クリームはんだ組成物および電子部品 |
JP2010534139A (ja) * | 2007-07-23 | 2010-11-04 | ヘンケル リミテッド | ハンダ用フラックス |
JP2009285715A (ja) * | 2008-05-30 | 2009-12-10 | Arakawa Chem Ind Co Ltd | はんだフラックスおよびクリームはんだ |
JP2011131247A (ja) * | 2009-12-24 | 2011-07-07 | Harima Chemicals Inc | アルミニウムろう付け用組成物 |
JP2012161829A (ja) * | 2011-02-08 | 2012-08-30 | Mitsubishi Materials Corp | フラックス、はんだペースト及び実装基板の製造方法 |
WO2013108663A1 (ja) * | 2012-01-17 | 2013-07-25 | 千住金属工業株式会社 | やに入りはんだ用フラックス及びやに入りはんだ |
JP2013146740A (ja) * | 2012-01-17 | 2013-08-01 | Denso Corp | やに入りはんだ用フラックス及びやに入りはんだ |
KR101472723B1 (ko) * | 2012-01-17 | 2014-12-12 | 센주긴조쿠고교 가부시키가이샤 | 플럭스가 함유된 솔더용 플럭스 및 플럭스가 함유된 솔더 |
US10045845B2 (en) | 2012-11-13 | 2018-08-14 | Mitraltech Ltd. | Percutaneously-deliverable mechanical valve |
JP2017035731A (ja) * | 2015-08-10 | 2017-02-16 | 荒川化学工業株式会社 | 鉛フリーはんだペースト用フラックス及び鉛フリーはんだペースト |
JP2019130566A (ja) * | 2018-01-31 | 2019-08-08 | 株式会社タムラ製作所 | フラックス組成物、はんだ組成物および電子基板 |
Also Published As
Publication number | Publication date |
---|---|
JP5012028B2 (ja) | 2012-08-29 |
CN101090797B (zh) | 2013-03-27 |
CN101090797A (zh) | 2007-12-19 |
KR20070118587A (ko) | 2007-12-17 |
US20080115861A1 (en) | 2008-05-22 |
KR101125383B1 (ko) | 2012-03-27 |
EP1834728A4 (en) | 2009-11-04 |
JPWO2006070797A1 (ja) | 2008-06-12 |
EP1834728A1 (en) | 2007-09-19 |
TW200633810A (en) | 2006-10-01 |
TWI355981B (ja) | 2012-01-11 |
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