WO2010113833A1 - 鉛フリーはんだ用フラックス組成物及び鉛フリーはんだ組成物 - Google Patents
鉛フリーはんだ用フラックス組成物及び鉛フリーはんだ組成物 Download PDFInfo
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- WO2010113833A1 WO2010113833A1 PCT/JP2010/055505 JP2010055505W WO2010113833A1 WO 2010113833 A1 WO2010113833 A1 WO 2010113833A1 JP 2010055505 W JP2010055505 W JP 2010055505W WO 2010113833 A1 WO2010113833 A1 WO 2010113833A1
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Classifications
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- 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
- B23K35/02—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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L93/00—Compositions of natural resins; Compositions of derivatives thereof
- C08L93/04—Rosin
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09F—NATURAL RESINS; FRENCH POLISH; DRYING-OILS; OIL DRYING AGENTS, i.e. SICCATIVES; TURPENTINE
- C09F1/00—Obtaining purification, or chemical modification of natural resins, e.g. oleo-resins
- C09F1/04—Chemical modification, e.g. esterification
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Definitions
- the present invention relates to a flux composition for lead-free solder and a lead-free solder composition.
- Cream solder is a mixture of solder powder and liquid flux, and is widely used when mounting electronic components such as resistors, capacitors, and ICs on a printed circuit board.
- the flux is usually produced by mixing a base resin, a solvent, an activator, a thixotropic agent and other additives.
- a base resin As a base resin, it has excellent performance such as corrosiveness and insulation resistance, and has the effect of preventing reoxidation of metals after soldering, so natural rosin, polymerized rosin, hydrogenated rosin, disproportionated rosin, maleic acid modified Rosin resins such as rosin, acrylic acid-modified rosin and esterified rosin are used.
- amine halogen salts As solvents, alcohols, esters, pyrrolidones and the like are used.
- amine halogen salts As the activator, amine halogen salts, amine organic acid salts, organic acids, organic halides, amines and the like are used (for example, see Non-Patent Document 1).
- a softening point depressant, a rust inhibitor, an antioxidant, a stabilizer, a matting agent, and the like are added to the flux as necessary.
- the activator has high acidity and is easily miscible with water, adding a large amount of activator causes problems such as corrosion of the flux residue after soldering and reduction of insulation resistance in a high-temperature and high-humidity environment.
- the entire electronic component including the solder joint may be sealed with a mold resin in order to shield the solder joint from the external environment.
- the flux residue adhering to the solder joint part inhibits the curing of the sealing resin, it is necessary to remove the flux residue. For this reason, there existed a problem that a mounting process became complicated and had to be made into the flux composition which can remove a flux residue by washing
- the present invention can realize highly reliable die bonding with little generation of voids even when reflowed in the atmosphere. Further, when sealing with a sealing resin after soldering, the sealing resin It aims at providing the solder composition which does not inhibit hardening, and the flux composition used therefor.
- the inventor is a rosin-derived component containing (meth) acrylic acid-modified rosin, dehydroabietic acid, and dihydroabietic acid, and the amount of dehydroabietic acid is relative to the total amount of the rosin-derived component.
- a solder composition prepared using a flux composition containing a rosin-derived component having a content of 7 to 65% by weight and a dihydroabietic acid content of 3 to 57% by weight generates voids. It was found that the resin was not hindered when the resin was sealed.
- the present invention has been completed based on the above findings, and provides the following flux composition and solder composition.
- Item 1 A rosin-derived component containing (meth) acrylic acid-modified rosin, dehydroabietic acid, and dihydroabietic acid, and the content of dehydroabietic acid is 7 to 65% by weight with respect to the total amount of the rosin-derived component
- a flux composition for lead-free solder comprising a rosin-derived component having a dihydroabietic acid content of 3 to 57% by weight.
- Item 2. The lead-free solder flux composition according to Item 1, wherein the rosin-derived component contains 4 to 15% by weight of tetrahydroabietic acid with respect to the total amount thereof.
- the (meth) acrylic acid-modified rosin is 55 to 58% by weight of (meth) acrylic acid with respect to 100 parts by weight of at least one rosin selected from the group consisting of gum rosin, wood rosin, tall oil rosin, and purified products thereof.
- Item 2. The lead-free solder flux composition according to Item 1, which is obtained by partial reaction.
- Item 4. Item 6.
- a lead-free solder composition comprising the flux composition for lead-free solder according to Item 1 and a lead-free solder.
- Item 6. Item 6.
- the solder composition of the present invention has good solder wettability and suppressed generation of voids even after high-temperature preheating in die bonding during atmospheric reflow. Is obtained. Further, by using the solder composition of the present invention, inhibition of resin curing can be suppressed even when resin sealing is performed after soldering.
- the solder composition of the present invention is particularly useful when used as a lead-free cream solder.
- the rosin-derived component contained in the lead-free solder flux composition of the present invention contains (meth) acrylic acid-modified rosin.
- the (meth) acrylic acid-modified rosin used for the preparation of the lead-free solder flux composition of the present invention is obtained by adding (meth) acrylic acid to rosins.
- the (meth) acrylic acid-modified rosin is not only an addition reaction product obtained by adding (meth) acrylic acid to rosins, but also (meth) acrylic acid added to rosins. A hydride of the obtained addition reaction product is also included.
- the rosins used in preparing the (meth) acrylic acid-modified rosin are not particularly limited, and known ones can be used. Specific examples include raw material rosins such as gum rosin, wood rosin, and tall oil rosin. Moreover, you may use what refine
- the conditions for distillation are usually a temperature of about 200 to 300 ° C. and a pressure of about 130 to 1300 Pa.
- the distillation time can be appropriately selected in consideration of the distillation temperature and pressure.
- unpurified rosins can be dissolved in a good solvent, and then the solvent is distilled off to obtain a concentrated solution, and a poor solvent is added to this solution.
- good solvents include benzene, toluene, xylene, chloroform, lower alcohols having 1 to 3 carbon atoms, ketones such as acetone, and acetates such as ethyl acetate.
- poor solvents include n-hexane and n-heptane. , Cyclohexane, isooctane and the like.
- the purification may be performed by converting unpurified rosins into an alkaline aqueous solution using alkaline water, and extracting the resulting insoluble unsaponified product with an organic solvent, and then neutralizing the aqueous layer.
- the reaction between (meth) acrylic acid and rosins can be carried out by a known method. Specifically, for example, (meth) acrylic acid and rosins can be mixed and heated at about 150 to 300 ° C. for about 0.5 to 24 hours.
- the amount of (meth) acrylic acid and rosins used is not particularly limited. Usually, about 55 to 58 parts by weight of (meth) acrylic acid can be reacted with 100 parts by weight of rosins.
- Hydrogenation conditions for hydrogenating an addition reaction product obtained by adding (meth) acrylic acid to rosins are not particularly limited, and a known method can be adopted. Specifically, for example, an addition reaction product obtained by adding (meth) acrylic acid to rosins is usually in the presence of a hydrogenation catalyst under a hydrogen pressure of about 1 to 25 MPa, preferably about 5 to 20 MPa. And heating for about 0.5 to 7 hours, preferably about 1 to 5 hours.
- a hydrogenation catalyst known catalysts such as supported catalysts such as palladium carbon, rhodium carbon, ruthenium carbon and platinum carbon, metal powders such as nickel and platinum, and iodides such as iodine and iron iodide can be used. .
- the amount of the catalyst used is usually about 0.01 to 5 parts by weight, preferably 0.01 to 3 parts per 100 parts by weight of the addition reaction product obtained by adding (meth) acrylic acid to rosins. It can be a weight part.
- the hydrogenation temperature can be about 100 to 300 ° C., preferably 150 to 290 ° C.
- the hydrogenation is preferably carried out until the hydrogenation rate reaches about 30 to 60% from the viewpoint of obtaining a resin having good resin color tone and thermal stability and low crystallinity.
- the hydrogenation rate is a value determined by gas chromatography GC-14A (manufactured by Shimadzu Corporation).
- the content of the (meth) acrylic acid adduct of rosin contained in the rosins-derived component is not particularly limited, but is usually about 9 to 56% by weight, particularly 15 to 50%, based on the total amount of the rosins-derived component. A weight percentage of about 20% to 45% by weight is preferred because wet spreadability is good and compatibility with the sealing resin is good.
- the lead-free solder flux composition of the present invention comprises about 7 to 65% by weight of dehydroabietic acid and 3% of dihydroabietic acid in the rosins-derived component with respect to the total amount of the rosins-derived component. It is characterized by containing about 57% by weight.
- the content of these resin acid components in the rosins-derived component is preferably about 10 to 55% by weight of dehydroabietic acid and about 5 to 50% by weight of dihydroabietic acid based on the total amount of the rosins-derived component. More preferably, the amount is about 12 to 45% by weight of dehydroabietic acid and about 7 to 45% by weight of dihydroabietic acid.
- the lead-free solder flux composition of the present invention preferably contains about 4 to 15% by weight, more preferably about 8 to 14% by weight, of tetrahydroabietic acid in the rosins-derived component.
- the above-mentioned (meth) acrylic acid-modified rosin usually contains rosin acrylic acid adduct (in the case of hydride, hydride of rosin acrylic acid adduct), dehydroabietic acid, dihydro Since abietic acid, tetrahydroabietic acid, and the like are included, dehydroabietic acid and dihydroabietic acid may be derived from (meth) acrylic acid-modified rosin.
- the content of dehydroabietic acid and dihydroabietic acid in the rosin-based component is within the above range without adding a component containing dehydroabietic acid and dihydroabietic acid separately. You may be able to
- the content of dehydroabietic acid and dihydroabietic acid in the rosin-based component does not fall within the above range by simply adding (meth) acrylic acid-modified rosin, the content of dehydroabietic acid and dihydroabietic acid is It is necessary to adjust to this range.
- a known rosin derivative such as hydrogenated rosin or disproportionated rosin may be appropriately blended.
- the amount of disproportionated rosin used may be increased.
- the disproportionated rosin is obtained by disproportionating a raw material rosin such as gum rosin, wood rosin, tall oil rosin or the like by a known method. Disproportionation can usually be performed by heating the raw material rosin in the presence of a disproportionation catalyst.
- the disproportionation catalyst include supported catalysts such as palladium carbon, rhodium carbon, and platinum carbon, metal powders such as nickel and platinum, and iodides such as iodine and iron iodide.
- the amount is usually about 0.01 to 5% by weight, preferably about 0.01 to 1.0% by weight, based on rosin.
- the heating is usually performed at a temperature of about 180 to 280 ° C. for about 1 to 6 hours.
- the disproportionated rosin usually contains about 40 to 55% by weight of dehydroabietic acid. In addition, you may use what increased dehydroabietic acid content by refine
- the hydrogenated rosin is obtained by hydrogenating raw material rosins such as gum rosin, wood rosin, tall oil rosin and the like by a known method. Hydrogenation can be performed by the same method as hydrogenation of a (meth) acrylic acid modified rosin.
- the content of each component varies depending on the degree of hydrogenation in hydrogenated rosin, but usually 5 to 40% by weight of dehydroabietic acid, 20 to 70% by weight of dihydroabietic acid, and 5 to 60% by weight. Of tetrahydroabietic acid.
- the flux composition By adjusting the content of the abietic acid component contained in the rosin-derived component contained in the flux, the flux composition has excellent solder wettability, suppressed void generation, and excellent compatibility with the sealing resin. It becomes.
- the (meth) acrylic acid-modified rosin and / or the above-mentioned disproportionated rosin and hydrogenated rosin are appropriately adjusted or necessary.
- an esterified rosin containing no abietic acid may be used.
- the flux composition for solder according to the present invention contains (meth) acrylic acid-modified rosin, and the content of dehydroabietic acid and dihydroabietic acid is within the above-mentioned range.
- a known base resin for solder flux can be included.
- the solder flux base resin other than rosins include polyester resin, phenoxy resin, terpene resin, polyamide resin, acrylic resin, polyethylene resin, and polypropylene resin.
- the solder flux base resin other than rosin can be used alone or in combination of two or more.
- the amount of use of the base resin for flux other than rosin is not particularly limited, but is usually about 1 to 30% by weight of the total amount of the flux composition.
- the solder flux composition of the present invention can contain an activator as required.
- an activator it does not specifically limit but a well-known thing can be used. Specific examples include amine hydrohalides, organic acids, organic halogens, and organic amines. Of these, organic acids and organic halogens are preferred. Of the organic acids, dibasic acids are preferable, and glutaric acid, adipic acid, suberic acid, and the like are particularly preferable.
- organic halogens nonionic organic halogen activators are preferable in terms of good solder wettability and low corrosion, and specifically, trans-2,3-dibromo-1,4-butenediol. Tetrabromobutane and the like are preferable.
- An activator can be used individually by 1 type or in combination of 2 or more types.
- the content may be, for example, about 0.05 to 20% by weight, preferably about 0.5 to 10% by weight, based on the total amount of the flux composition.
- the content may be, for example, about 0.05 to 10% by weight, and preferably about 0.5 to 10% by weight, based on the total amount of the flux.
- additives such as antioxidants, solvents, thixotropic agents, plasticizers and the like may be added to the solder flux of the present invention as necessary.
- An additive can be used individually by 1 type or in combination of 2 or more types.
- the antioxidant is not particularly limited, and a known product can be used. Specific examples include 2,6-di-tert-butyl-p-cresol, para-tert-amylphenol, 2,2′-methylenebis (4-methyl-6-tert-butylphenol) and the like.
- the amount of the antioxidant used is not particularly limited, but is usually about 0.5% to 1% by weight of the total amount of the flux.
- the solvent is not particularly limited and a known solvent can be used. Specifically, alcohols such as ethanol, n-propanol, isopropanol and isobutanol, glycol ethers such as butyl carbitol and hexyl carbitol, esters such as isopropyl acetate, ethyl propionate, butyl benzoate and diethyl adipate And hydrocarbons such as n-hexane, dodecane, and tetradecene.
- the amount of the solvent to be used is not particularly limited, but usually it may be about 20% to 40% by weight of the total amount of the flux composition.
- the thixotropic agent is not particularly limited, and known ones can be used. Specific examples include hardened castor oil, beeswax, carnauba wax, stearamide, hydroxy stearic acid ethylene bisamide, and the like.
- the amount of the thixotropic agent used is not particularly limited, but usually it may be about 3 to 10% by weight of the total amount of the flux.
- the plasticizer is not particularly limited, and a known plasticizer can be used. Specific examples include carboxylic acid esters such as dioctyl phthalate and dioctyl adipate.
- the amount of the plasticizer to be used is not particularly limited, but is usually 5% to 10% by weight of the total amount of the flux.
- solder composition of the present invention is a lead-free solder composition, and the above-mentioned lead-free solder flux composition of the present invention and a lead-free solder alloy are mixed, particularly uniformly or substantially uniformly. Or by combining them.
- the solder alloy used in the present invention is not particularly limited as long as it is an alloy used for lead-free solder, and a known alloy can be used.
- it is an alloy mainly based on Sn and mainly composed of Sn—Ag, Sn—Cu, Sn—Sb, Sn—Zn, etc., and if necessary, Ag, One or more of Al, Au, Bi, Co, Cu, Fe, Ga, Ge, In, Ni, P, Pt, Sb, and Zn may be added.
- Sn95Sb5 solidus temperature 238 ° C., liquidus temperature 241 ° C.
- Sn99.3Cu0.7 solidus temperature 227 ° C., liquidus temperature 228 ° C.
- Sn97Cu3 solidus line
- Sn92Cu6Ag2 solidus temperature 217 ° C, liquidus temperature 373 ° C
- Sn99Cu0.7Ag0.3 solidus temperature 217 ° C, liquidus temperature 226 ° C
- Sn95Cu4Ag1 solidus temperature 217 ° C, liquidus temperature 335 ° C
- Sn97Ag3 solidus temperature 221 ° C, liquidus temperature 222 ° C
- Sn96.3Ag3.7 solidus temperature 221 ° C, liquidus temperature
- the content ratio of the two is not particularly limited.
- the solder alloy is contained in the lead-free solder composition in an amount of about 80 to 95% by weight. Is preferably contained in an amount of about 5 to 20% by weight, more preferably about 85 to 92% by weight of a solder alloy and about 8 to 15% by weight of a solder flux composition.
- the lead-free solder composition thus obtained can be used, for example, as a lead-free cream solder.
- Hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Co., Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, 15% by weight of hydride of acrylic acid adduct of rosin Rosin acrylic acid adduct (41 wt%), 40.2 wt%, dibromosuccinic acid (Aldrich) 1.3 wt%, glutaric acid (Tokyo Kasei Co., Ltd.) 3.2 wt%, trans-2 , 3-dibromo-2-butene-1,4-diol (Tokyo Kasei Co., Ltd.) 4% by weight, amine (Lion Akzo Co., Ltd.) 10% by weight, diethylene glycol monohexyl ether (Nippon Emulsifier Co., Ltd.) A solder paste flux composition containing 35.3% by weight and 6% by weight
- the flux composition thus obtained was used with a solder alloy having an alloy composition of Sn 96.5% by weight-Ag 3.0% by weight-copper 0.5% by weight with a particle diameter of 25 to 38 ⁇ m and a flux content of 10.
- An 8% cream solder was prepared.
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin Instead of acrylic acid adduct hydride 15% by weight, rosin acrylic acid adduct 41% by weight), acrylic acid modified rosin (Arakawa Chemical Industries, Ltd., composition: dehydroabietic acid content 19% by weight, A cream solder was obtained in the same manner as in Example 1 except that 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, and 56% by weight of rosin acrylic acid adduct were used.
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct and 41% by weight of acrylic acid adduct of rosin) were replaced by 40.2% by weight, and the same hydrodenic acid-modified rosin and dehydroabietic acid-rich disproportionated rosin (Arakawa Chemical Industries, Ltd., composition: 80% by weight of dehydroabietic acid, 8% by weight of dihydroabietic acid, 12% by weight of tetrahydroabietic acid; hereinafter referred to as “disproportionated rosin”) is used at 20.1% by weight.
- a cream solder was obtained in the same manner as in Example 1.
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct and 41% by weight of rosin acrylic acid adduct were replaced by 40.2% by weight. ), Composition: 11% by weight of dehydroabietic acid, 69% by weight of dihydroabietic acid, 18% by weight of tetrahydroabietic acid) (hereinafter referred to as “hydrogenated rosin”). In the same manner as in No. 1, cream solder was obtained.
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct and 41% by weight of acrylic acid adduct of rosin) were replaced with 40.2% by weight, and the same hydration acrylic acid modified rosin, disproportionated rosin, and hydrogenated rosin were obtained.
- a cream solder was obtained in the same manner as in Example 1 except that 13.4% by weight was used.
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct, 41% by weight of rosin acrylic acid adduct) was replaced by 40.2% by weight, 9.2% by weight of hydrated acrylic acid-modified rosin, disproportionated rosin Was used in the same manner as in Example 1 except that 29% by weight and 2% by weight of hydrogenated rosin were used.
- hydrogenated acrylic acid-modified rosin manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct, 41% by
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct and 41% by weight of acrylic acid adduct of rosin were replaced by 40.2% by weight, and 16.1% by weight of hydrogenated acrylic acid-modified rosin and esterified rosin ( A cream solder was obtained in the same manner as in Example 1 except that 24.1% by weight of Arakawa Chemical Industries, Ltd., composition: residual abietic acid 0% by weight) (hereinafter referred to as “esterified rosin”) was used. .
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct, 41% by weight of rosin acrylic acid adduct) was replaced by 40.2% by weight, and 32.2% by weight of hydrogenated acrylic acid-modified rosin and esterified rosin A cream solder was obtained in the same manner as in Example 1 except that 8% by weight was used.
- hydrogenated acrylic acid-modified rosin manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct, 41% by weight of rosin
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct and 41% by weight of acrylic acid adduct of rosin 40.2% by weight, and 10.2% by weight of hydrogenated rosin modified rosin and hydrogenated rosin.
- a cream solder was obtained in the same manner as in Example 1 except that 30% by weight was used.
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin A cream solder was obtained in the same manner as in Example 1 except that disproportionated rosin was used instead of 15% by weight of hydride of acrylic acid adduct and 41% by weight of acrylic acid adduct of rosin.
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin A cream solder was obtained in the same manner as in Example 1 except that hydrogenated rosin was used instead of 15% by weight of hydride of acrylic acid adduct and 41% by weight of acrylic acid adduct of rosin.
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct, 41% by weight of rosin acrylic acid adduct) was replaced by 40.2% by weight, 6.7% by weight of the same hydrogenated acrylic acid-modified rosin, and disproportionated rosin A cream solder was obtained in the same manner as in Example 1 except that 33.5 wt% of each was used.
- hydrogenated acrylic acid-modified rosin manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct, 41% by
- Example 1 as a rosin-derived component, hydrogenated acrylic acid-modified rosin (manufactured by Arakawa Chemical Industries, Ltd., composition: 19% by weight of dehydroabietic acid, 10% by weight of dihydroabietic acid, 10% by weight of tetrahydroabietic acid, rosin 15% by weight of hydride of acrylic acid adduct, 41% by weight of acrylic acid adduct of rosin) was replaced by 40.2% by weight, 8% by weight of the same hydrogenated acrylic acid-modified rosin, and 32.
- a cream solder was obtained in the same manner as in Example 1 except that 2% by weight was used. Table 1 below shows the composition, void area ratio, and effectiveness of the sealing resin of each of the above Examples and Comparative Examples.
- HeDG represents diethylene glycol monohexyl ether. From Table 1, when the solder flux composition of the present invention is used, the void area ratio is 10% or less, and any resin is used, and no flux residue remains on the substrate after resin removal. I understand that.
- the solder composition of the present invention has good solder wettability even after reflowing in the air, so that it has good solderability, less voids, and can realize highly reliable die bonding.
- a sealing resin When sealed with a sealing resin, it is highly practical and does not hinder the curing of the sealing resin.
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Abstract
Description
フラックスは、通常、ベース樹脂、溶剤、活性剤、チクソ剤およびその他の添加剤を混合して製造される。ベース樹脂としては、腐食性、絶縁抵抗などの性能に優れ、かつはんだ付け後の金属の再酸化防止作用を有することから、天然ロジン、重合ロジン、水素化ロジン、不均化ロジン、マレイン酸変性ロジン、アクリル酸変性ロジン、エステル化ロジン等のロジン系樹脂が使用されている。溶剤としてはアルコール類、エステル類、ピロリドン類等が使用されている。活性剤としてはアミンハロゲン塩、アミン有機酸塩、有機酸、有機ハロゲン化物、アミン等が用いられている(例えば、非特許文献1参照)。また、フラックスには、必要に応じて、軟化点降下剤、防錆剤、酸化防止剤、安定剤や艶消し剤等が添加されている。
この問題を解決するため、多量に活性剤を用いることで、クリームはんだの濡れ広がり性を向上させ、はんだを溶融しやすくして、ボイドの発生を抑制する手法が採られている。
そこで、はんだ接合部を外部環境から遮断するためにはんだ接合部を含む電子部品全体をモールド樹脂によって封止することがある。この場合、はんだ接合部に付着しているフラックス残渣が、封止樹脂の硬化を阻害するため、フラックス残渣を除去する必要がある。このため、実装工程が煩雑になるとともに、フラックス残渣を洗浄等により除去可能となるようなフラックス組成物にしなければならないという問題があった。このため、フラックス残渣を洗浄することなく樹脂封止可能なクリームはんだが求められていた。
項1. (メタ)アクリル酸変性ロジン、デヒドロアビエチン酸、及びジヒドロアビエチン酸を含むロジン類由来成分であって、ロジン類由来成分の全量に対して、デヒドロアビエチン酸の含有量が7~65重量%であり、ジヒドロアビエチン酸の含有量が3~57重量%であるロジン類由来成分を含有することを特徴とする鉛フリーはんだ用フラックス組成物。
項2. ロジン類由来成分が、その全量に対して、テトラヒドロアビエチン酸を4~15重量%含有する項1に記載の鉛フリーはんだ用フラックス組成物。
項3. (メタ)アクリル酸変性ロジンが、ガムロジン、ウッドロジン、トール油ロジン、及びそれらの精製物からなる群より選ばれた少なくとも1種のロジン類100重量部に対し(メタ)アクリル酸を55~58重量部反応させて得られるものである項1に記載の鉛フリーはんだ用フラックス組成物。
項4. ロジン類由来成分中に、ロジンの(メタ)アクリル酸付加物を10~56重量%含有する項1に記載の鉛フリーはんだ用フラックス組成物。
項5. 項1に記載の鉛フリーはんだ用フラックス組成物と鉛フリーはんだとを含有する鉛フリーはんだ組成物。
項6. 鉛フリーはんだ組成物が鉛フリークリームはんだ組成物である項5に記載の鉛フリーはんだ組成物。
(I)鉛フリーはんだ用フラックス組成物
(メタ)アクリル酸変性ロジン
本発明の鉛フリーはんだ用フラックス組成物に含まれるロジン類由来成分は、(メタ)アクリル酸変性ロジンを含有する。本発明の鉛フリーはんだ用フラックス組成物の調製に用いられる(メタ)アクリル酸変性ロジンは、ロジン類に(メタ)アクリル酸を付加させて得られる。なお、本発明において、(メタ)アクリル酸変性ロジンには、ロジン類に(メタ)アクリル酸を付加させて得られた付加反応物ばかりでなく、ロジン類に(メタ)アクリル酸を付加させて得られた付加反応物の水素化物も含まれる。
ロジン類由来成分中に含まれるロジンの(メタ)アクリル酸付加物の含有量は、特に限定されないが、ロジン類由来成分の全量に対して、通常、9~56重量%程度、中でも15~50重量%程度、特に20~45重量%程度とすることが、濡れ広がり性が良好となり、封止樹脂との相溶性が良好となるため好ましい。
また、本発明の鉛フリーはんだ用フラックス組成物は、ロジン類由来成分中に、ロジン類由来成分の全量に対して、デヒドロアビエチン酸を7~65重量%程度及びジヒドロアビエチン酸を3~57重量%程度含有することを特徴とする。
前述した(メタ)アクリル酸変性ロジンには、通常、ロジンのアクリル酸付加物(水素化物の場合には、ロジンのアクリル酸付加物の水素化物も含まれる。)の他、デヒドロアビエチン酸、ジヒドロアビエチン酸、テトラヒドロアビエチン酸等が含まれているため、デヒドロアビエチン酸、ジヒドロアビエチン酸は(メタ)アクリル酸変性ロジンに由来する場合がある。従って、(メタ)アクリル酸変性ロジンの他に、別途デヒドロアビエチン酸、ジヒドロアビエチン酸を含む成分を添加しなくても、ロジン系成分中のデヒドロアビエチン酸、及びジヒドロアビエチン酸の含有量を上記範囲にできる場合がある。
本発明のはんだ用フラックス組成物は、(メタ)アクリル酸変性ロジンを含有し、デヒドロアビエチン酸、ジヒドロアビエチン酸の含有量が前述の範囲になる範囲で、必要に応じて、ロジン系成分以外の公知のはんだフラックス用ベース樹脂を含むことができる。ロジン類以外のはんだフラックス用ベース樹脂としては、例えば、ポリエステル樹脂、フェノキシ樹脂、テルペン樹脂、ポリアミド樹脂、アクリル樹脂、ポリエチレン樹脂、ポリプロピレン樹脂などが挙げられる。ロジン以外のはんだフラックス用ベース樹脂は1種を単独で、又は2種以上を組み合わせて用いることができる。
ロジン以外のフラックス用ベース樹脂を使用する場合の使用量は、特に限定されないが、通常、フラックス組成物の全体量の1~30重量%程度とすればよい。
本発明のはんだ用フラックス組成物は、必要に応じて活性剤を含むことができる。活性剤としては、特に限定されず公知のものを使用することができる。具体的には、例えば、アミンのハロゲン化水素酸塩、有機酸類や有機ハロゲン類、有機アミン類などが挙げられる。これらの中では、有機酸、有機ハロゲン類が好ましい。有機酸の中では二塩基酸が好ましく、特にグルタル酸、アジピン酸、スベリン酸等が好ましい。有機ハロゲン類としては、はんだの濡れ性が良好で、かつ腐食が少ない点で、非イオン性有機ハロゲン類活性剤が好ましく、具体的にはトランス-2、3-ジブロモ-1,4-ブテンジオール、テトラブロモブタン等が好ましい。活性剤は、1種を単独で、又は2種以上を組み合わせて用いることができる。
また、本発明のはんだ用フラックスには、必要に応じて、酸化防止剤、溶剤、チクソ剤、可塑剤等の各種公知の添加剤を添加してもよい。添加剤は1種を単独で、又は2種以上を組み合わせて使用できる。
酸化防止剤としては、特に限定されず公知の物を使用することができる。具体的には、例えば2,6-ジ-tert-ブチル-p-クレゾール、パラ-tert-アミルフェノール、2,2’-メチレンビス(4-メチル-6-tert-ブチルフェノール)などがあげられる。酸化防止剤の使用量は、特に限定されないが通常、フラックス全体量の0.5重量%~1重量%程度とすればよい。
チクソ剤としては、特に限定されず公知のものを使用することができる。具体的には、例えば、硬化ひまし油、蜜ロウ、カルナバワックス、ステアリン酸アミド、ヒドロキシステアリン酸エチレンビスアミドなどが挙げられる。チクソ剤の使用量は、特に限定されないが、通常、フラックス全体量の3重量%~10重量%程度とすればよい。
本発明のはんだ組成物は、鉛フリーはんだ組成物であり、前述の本発明の鉛フリーはんだ用フラックス組成物と鉛フリーはんだ合金とを混合、特に均一又は略均一に混合することにより、又は組み合わせることにより得ることができる。本発明に用いられるはんだ合金は、鉛フリーはんだに用いられる合金であれば特に限定されず公知のものを用いることができる。通常は、主にSnをベースとする合金であって、Sn-Ag系、Sn-Cu系、Sn-Sb系、Sn-Zn系等を主成分とするものであり、必要に応じてAg、Al、Au、Bi、Co、Cu、Fe、Ga、Ge、In、Ni、P、Pt、Sb、Znの1種または2種以上を添加してもよい。
各例中、特記しない限り、「部」は「重量部」を意味し、「%」は「重量%」を意味する。なお、各例で使用したクリームはんだは、フラックス含有量10.8重量%、粒径25~38μmのSn3.0Ag0.5Cuはんだ粉末を混練して作製したものである。また、フラックス組成物中のロジン異性体の比率は島津製作所(製)ガスクロマトグラフィーGC2014を用いて測定した。
以下にそれぞれの試験方法を説明する。
Cuランド上に、以下の各例で調製したクリームはんだを印刷し、その上に無電解NiメッキCuチップを載せ、大気中で260℃まで加熱し、サンプル基板とした。X線透過装置にて、チップ面積に対するボイド面積の比率を計測した。ボイド面積率が10%以下のものは○、10%超のものは×とした。
櫛形電極基板の電極上に、以下の各例で調製したクリームはんだを印刷し、270℃で加熱しはんだを溶融させた。はんだ付け部に各種封止樹脂を塗布し、熱硬化させてサンプル基板とした。顕微鏡で観察しながら封止樹脂を剥がした。
このとき、樹脂が硬化しており、樹脂を除去した後の基板上にフラックス残渣がないものを○、樹脂は硬化しているが、樹脂を除去した後の基板上にフラックス残渣が残っているものを△、樹脂が硬化しなかったものを×とした。
このようにして得られたフラックス組成物を、合金組成がSn96.5重量%-Ag3.0重量%-銅0.5重量%のはんだ合金を用いて粒径φ25~38μm、フラックス含有量10.8%のクリームはんだを作製した。
上記各実施例及び比較例の組成、ボイド面積率、及び封止樹脂の効果性を以下の表1に示す。
Claims (6)
- (メタ)アクリル酸変性ロジン、デヒドロアビエチン酸、及びジヒドロアビエチン酸を含むロジン類由来成分であって、ロジン類由来成分の全量に対して、デヒドロアビエチン酸の含有量が7~65重量%であり、ジヒドロアビエチン酸の含有量が3~57重量%であるロジン類由来成分を含有することを特徴とする鉛フリーはんだ用フラックス組成物。
- ロジン類由来成分が、その全量に対して、テトラヒドロアビエチン酸を4~15重量%含有する請求項1に記載の鉛フリーはんだ用フラックス組成物。
- (メタ)アクリル酸変性ロジンが、ガムロジン、ウッドロジン、トール油ロジン、及びそれらの精製物からなる群より選ばれた少なくとも1種のロジン類100重量部に対し(メタ)アクリル酸を55~58重量部反応させて得られるものである請求項1に記載の鉛フリーはんだ用フラックス組成物。
- ロジン類由来成分中に、ロジンの(メタ)アクリル酸付加物を10~56重量%含有する請求項1に記載の鉛フリーはんだ用フラックス組成物。
- 請求項1に記載の鉛フリーはんだ用フラックス組成物と鉛フリーはんだとを含有する鉛フリーはんだ組成物。
- 鉛フリーはんだ組成物が鉛フリークリームはんだ組成物である請求項5に記載の鉛フリーはんだ組成物。
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WO2020079147A1 (fr) * | 2018-10-19 | 2020-04-23 | Dehon Sa | Alliage de brasure sans plomb et utilisation d'un tel alliage |
FR3087368A1 (fr) * | 2018-10-19 | 2020-04-24 | Dehon Sa | Alliage de brasure sans plomb et utilisation d'un tel alliage |
US11590614B2 (en) | 2018-10-25 | 2023-02-28 | Senju Metal Industry Co., Ltd. | Flux and solder paste |
JP2020089894A (ja) * | 2018-12-03 | 2020-06-11 | 千住金属工業株式会社 | フラックス、はんだ合金、接合体、及び接合体の製造方法 |
US11571770B2 (en) | 2019-05-27 | 2023-02-07 | Senju Metal Industry Co., Ltd. | Solder alloy, solder paste, solder ball, solder preform, and solder joint |
CN112935632A (zh) * | 2019-12-11 | 2021-06-11 | 荒川化学工业株式会社 | 无铅焊料助焊剂用松香类基础树脂、无铅焊料助焊剂、无铅焊膏 |
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CN102369083B (zh) | 2014-08-20 |
TWI481466B (zh) | 2015-04-21 |
JP5423789B2 (ja) | 2014-02-19 |
JPWO2010113833A1 (ja) | 2012-10-11 |
CN102369083A (zh) | 2012-03-07 |
TW201039962A (en) | 2010-11-16 |
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