WO2011083831A1 - 鉛フリーハンダ用フラックス組成物及び鉛フリーハンダペースト - Google Patents
鉛フリーハンダ用フラックス組成物及び鉛フリーハンダペースト Download PDFInfo
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- WO2011083831A1 WO2011083831A1 PCT/JP2011/050139 JP2011050139W WO2011083831A1 WO 2011083831 A1 WO2011083831 A1 WO 2011083831A1 JP 2011050139 W JP2011050139 W JP 2011050139W WO 2011083831 A1 WO2011083831 A1 WO 2011083831A1
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- lead
- free solder
- flux composition
- weight
- solder paste
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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
- B23K35/36—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
- 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
- B23K35/3618—Carboxylic acids or salts
Definitions
- the present invention relates to a lead-free solder flux composition and a lead-free solder paste.
- Flux is a material used for soldering electronic components such as ICs, capacitors and resistors to printed circuit boards and the like, and is generally composed of components such as a base resin, an activator and a solvent.
- Surface mounting of electronic components is often used as a so-called cream solder composition (solder paste) in which a flux composition is kneaded with solder powder to form a paste (cream).
- Solder paste is suitable for automation because of its printability and adhesiveness, and its usage is increasing in recent years.
- Solder paste is applied on a printed circuit board by screen printing or a dispenser, electronic components are placed thereon, then heated and reflowed to fix the electronic components on the mounting substrate.
- the reflow refers to a series of operations in which the substrate on which the electronic component is placed is heated, the solder paste is heated to a melting temperature or higher, and the substrate electrode and the component electrode are joined.
- the current mainstream lead-free solder (Sn-Ag-Cu, Sn-Cu, etc.) has a higher melting point and is easier to oxidize than the mainstream tin-lead solder. Since the tension is high, the performance of melting and spreading on the substrate electrode such as copper, gold and tin is greatly inferior. Therefore, the preheating temperature is increased, the soldering temperature is increased, or soldering is performed in a nitrogen atmosphere. In recent years, in order to reduce manufacturing costs, switching to reflow in an air atmosphere rather than a nitrogen atmosphere has been promoted.
- the solder paste is required to have a printing performance corresponding to the minute electrode pattern on the mounting substrate, and the average particle diameter of the solder particles is reduced.
- the entire surface area of the solder particles is increased, the influence of the oxidation on the surface of the solder powder becomes more significant and the wettability is further lowered as compared with the solder powder having a particle diameter that has been conventionally used.
- a large amount of activator or activator having high reactivity such as a halogen compound is used.
- the halogen ion concentration per gram of flux is 3000 ppm or less in terms of chlorine
- the halogen ion concentration per gram of flux is 3000 ppm or less in terms of chlorine
- the halogen ion concentration per gram of flux is 3000 ppm or less in terms of chlorine
- the reducing agent in the flux Ascorbic acid derivatives, specific tocopherol derivatives, and lecithin are added, particles of 20 ⁇ m or less in the solder powder are 30% or less in number distribution, oxygen content is 500 ppm or less, and water content in the solder paste is 0.00. It is proposed that the content be 5 wt% or less (see Patent Documents 1 and 2). However, it is still not sufficient performance in terms of both wettability and storage stability in reflow in an air atmosphere.
- An object of the present invention is to provide a lead-free solder flux composition and a lead-free solder paste that are excellent in wettability with respect to an electrode in an air atmosphere, and that increase in viscosity over time is suppressed and storage stability is excellent. .
- the present inventors have repeatedly investigated the reaction between the flux component and the solder metal, and the halogen content contained in the flux composition is within a predetermined range and contains a specific carbon double bond compound. It was found that, while having excellent wettability with respect to the electrode, the increase in viscosity over time was suppressed and the storage stability was remarkably improved, and it was conceived that the above problems could be solved, and the present invention was achieved. Completed.
- the amount of bromine or chlorine in the flux composition is 500 to 30000 ppm with respect to the total amount of the flux composition, and the following general formula (1):
- the carbon double bond compound in the present invention 1 is one or more selected from the group consisting of 2-butene-1,4-diol, 2-hepten-1-ol and 5-hexen-1-ol.
- a flux composition for lead-free solder characterized in that
- the present invention 3 is the lead-free solder flux composition of the present invention 1 or 2, which contains at least one selected from the group consisting of acrylated rosin and hydrogenated rosin.
- the present invention 4 is the lead-free solder flux composition according to any one of the present inventions 1 to 3, which comprises a compound having a molecular weight of 200 or more and containing two or more bromines in the molecule.
- the present invention 5 is the lead-free solder flux composition according to any one of the present invention 1 to 4, characterized in that it contains a dicarboxylic acid having 4 to 20 carbon atoms.
- the present invention 6 is a lead-free solder paste characterized by containing the solder powder and the lead-free solder flux composition according to any one of the present inventions 1 to 5.
- a lead-free solder flux composition and a lead-free solder paste that are excellent in wettability with respect to an electrode during reflow in an air atmosphere, and that increase in viscosity over time is suppressed and excellent in storage stability. can do.
- the amount of bromine and / or chlorine contained in the flux composition is about 500 to 30000 ppm, more preferably 3000 to 15000 ppm of the total amount of the flux composition.
- the bromine amount and / or the chlorine amount are measured by a combustion ion chromatography method (for autosampler: AQF-100 type, manufactured by Dia Instruments, for measurement: ICS-3000, manufactured by Dionex).
- the combustion ion chromatography method is a method in which a flux or paste sample is placed in a reaction tube and burned at 900 to 950 ° C. and aerated in purified water, and ions in the absorbing solution are quantified by ion chromatography.
- bromine compound examples include, for example, a hydroxyl group-containing bromine compound (1-bromo-2-butanol, 1-bromo-2-propanol, 3-bromo-1-propanol, 3-bromo-1,2- Propanediol, 1,4-dibromo-2-butanol, 1,3-dibromo-2-propanol, 2,3-dibromo-1-propanol, 1,4-dibromo-2,3-butanediol and 2,3- Dibromo-2-butene-1,4-diol, etc.), carboxyl group-containing bromine compounds (2,3-dibromosuccinic acid, 2-bromosuccinic acid, 2,2-dibromoadipic acid, etc.), hydrocarbon group-containing bromine systems Compound (1-bromo-3-methyl-1-butene, 1,4-dibromobutene, 1-bromo-1-propene, 2,3-
- chlorinated compound examples include, for example, ethylamine hydrochloride, diethylamine hydrochloride, cyclohexylamine hydrochloride, isobutylamine hydrochloride, picolinate hydrochloride and diethanolamine hydrochloride. It is done. These can be used alone or in combination of two or more.
- the flux composition for lead-free solder of the present invention has the following general formula (1):
- the carbon double bond compound is not particularly limited, but one or more compounds selected from the group consisting of 2-butene-1,4-diol, 2-hepten-1-ol and 5-hexen-1-ol. It is preferable that In this case, the compound covers the surface of the solder metal by the coordination of the ⁇ electrons of the double bond portion of the compound to the solder metal and the coordination of the hydroxyl group to the solder metal, and further the activator of the flux composition. Limit reaction with solder metal. As a result, the oxidation of the solder metal surface is suppressed, the reaction is delayed during storage and in the manufacturing process such as printing, and the increase in the viscosity accompanying the reaction is suppressed to improve the storage stability. On the other hand, at the time of heating and reflowing, there is no hindrance to the active action due to the inclusion of this substance within the above range, and good wettability in both air and nitrogen atmospheres can be expressed at the same time.
- the carbon double bond compound is preferably contained in an amount of about 1 to 10% by weight in the lead-free solder flux composition. When it is 1% or more, the storage stability of the solder paste can be made excellent, and when it is 10% or less, it is possible to prevent the wet performance from being significantly lowered.
- the flux composition for lead-free solder of the present invention may further contain a base resin, an activator, a thixotropic agent, a solvent, and other additives.
- the base resin various known resins can be used without particular limitation.
- the base resin include rosin resins, polyester resins, phenoxy resins, terpene resins, and polyamide resins, and these can be used alone or in combination of two or more.
- the base resin preferably contains at least one selected from the group consisting of acrylated rosin and hydrogenated rosin from the viewpoint of improving wettability.
- the amount of each base resin used is not particularly limited, but is usually about 1% to 50% by weight of the total amount of the flux composition.
- Base resins include other synthetic resins (epoxy resin, acrylic resin, polyimide resin, polyamide resin, nylon resin, polyacrylonitrile resin, vinyl chloride resin, vinyl acetate resin, polyolefin resin, fluorine resin, and ABS resin. Etc.), elastomers (isoprene rubber, styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber, nylon rubber, nylon elastomer, polyester elastomer, etc.) can be used in combination.
- synthetic resins epoxy resin, acrylic resin, polyimide resin, polyamide resin, nylon resin, polyacrylonitrile resin, vinyl chloride resin, vinyl acetate resin, polyolefin resin, fluorine resin, and ABS resin.
- Etc. elastomers
- chloroprene rubber nylon rubber, nylon elastomer, polyester
- a carboxyl group-containing activator succinic acid, benzoic acid, adipic acid, abietic acid, glutaric acid, palmitic acid, stearic acid, formic acid, picolinic acid, azelaic acid, sebacic acid, eicosane diacid and water Dimer acid, etc.
- chlorine-containing amine activator ethylamine hydrochloride, methylamine hydrochloride, ethylamine bromate, diethylamine bromate, methylamine bromate, propenediol hydrochloride, allylamine hydrochloride, 3-amino -1-propene hydrochloride, N- (3-aminopropyl) methacrylamide hydrochloride, O-anisidine hydrochloride, n-butylamine hydrochloride, p-aminophenol hydrochloride, lauryltrimethylammonium chlor
- Etc. are one kind It can be used alone or in combination of two or more.
- dicarboxylic acids having 4 to 20 carbon atoms are preferably used from the viewpoint of improving storage stability.
- the amount of the activator used is usually about 3 to 15% by weight of the total amount of the flux composition mainly from the viewpoint of wettability of the solder paste to the electrode surface.
- thixotropic agent various known ones can be used without particular limitation. Specifically, for example, animal and plant thixotropic agents (castor oil, hydrogenated castor oil, beeswax, carnauba wax, etc.), amide type thixotropic agents (stearic amides such as 12-hydroxystearic acid ethylene bisamide and hydroxystearic acid ethylene bisamides) Etc.), and these can be used alone or in combination of two or more.
- the amount of thixotropic agent used is not particularly limited, but is usually about 3 to 10% by weight of the total amount of the flux composition from the viewpoint of suitability for continuous screen printing.
- the solvent is not particularly limited, and known solvents can be used. Specific examples include alcohols such as ethanol, n-propanol, isopropanol and isobutanol, glycol ethers such as butyl carbitol and hexyl carbitol, isopropyl acetate, ethyl propionate, butyl benzoate and diethyl adipate. Examples include esters, and hydrocarbons such as n-hexane, dodecane, and tetradecene. These may be used alone or in combination of two or more.
- the amount of the solvent used is not particularly limited, but is usually about 20% to 50% by weight of the total amount of the flux composition.
- additives are not particularly limited as long as they can be usually used for preparing a flux, and known ones can be used.
- an antioxidant for example, an antioxidant, an antifungal agent, a matting agent and the like can be contained.
- antioxidant 2,6-di-tert-butyl-p-cresol, p-tert-amylphenol, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate ], 2,2'-methylenebis (4-methyl-6-tert-butylphenol) and the like can be used.
- the content of the additive in the flux composition is not particularly limited, but is usually about 0.5 to 5% by weight of the total amount of the flux composition.
- the lead-free solder flux composition of the present invention can be obtained by melting and mixing the above materials using various known devices.
- a lead-free solder paste containing the above lead-free solder flux composition and solder powder is also one aspect of the present invention.
- the flux composition of the present invention is suitable for a lead-free solder paste.
- wetting with respect to an electrode during reflow is performed. It is possible to provide a lead-free soldering flux composition and a lead-free soldering paste that are excellent in properties and excellent in storage stability with suppressed increase in viscosity over time.
- the content of the lead-free solder paste is not particularly limited, but it is preferable that the solder powder contains about 70% to 95% by weight and the flux composition of the present invention contains about 5% to 30% by weight.
- the lead-free solder paste of the present invention can be prepared by using a kneading machine such as a planetary mill, for example, a solder powder and a flux composition.
- the other physical properties of the lead-free solder paste of the present invention are not particularly limited.
- the flow characteristics are obtained by taking into consideration the suitability for continuous screen printing, and the viscosity obtained by a spiral viscosity measurement method (JIS Z 3284) is 100 to 300 Pa.
- S and thixotropy index is preferably about 0.3 to 0.7.
- the shape of the solder powder is not particularly limited, and may be spherical (usually, the aspect ratio of the powder is preferably within 1.2) or indefinite, or a mixture of both. Good. Further, the particle size of the solder powder is not particularly limited, and a known one can be used.
- the metal of the solder powder is not particularly limited as long as it is generally used as lead-free solder.
- Specific examples include, for example, Sn-Ag series (Sn-3.5Ag etc.), Sn-Cu series (Sn-0.7Cu etc.), Sn-Ag-Cu series (Sn-3Ag-0.5Cu etc.), Examples thereof include Au-Si, Zn-Sn, and Bi-Cu lead-free solder powders, which can be used alone or in combination of two or more.
- metal elements such as In, Bi, Ni, Sb, Al, and Ge may be included as the metal component of the solder powder.
- Thickening rate (40 rpm, viscosity of 10 rpm after 24 hours ⁇ viscosity of 10 rpm after solder paste preparation) ⁇ (viscosity of 10 rpm after solder paste adjustment) ⁇ 100
- the dewetting test evaluated the wettability with respect to the copper plate in the heating and reflow in an atmospheric condition.
- the wettability was evaluated according to JIS Z 3284 Annex 10. The evaluation is based on a scoring system, 1 for a product that is not wetted to the copper electrode substrate and spreads more than it is applied to the test plate, 2 for a product that is all wetted and spread to the copper electrode, and a little unsatisfactory. It was set to 3 for those in which wetting occurred, and 4 for those that did not wet at all with respect to the copper electrode substrate. The same test was also conducted after 40 hours at 40 ° C. after the solder paste was prepared. In the above evaluation, those having “1” or “2” were judged to have excellent wettability.
- Example 1 A flux composition was prepared so as to have the composition shown in Table 1. Specifically, 2% by weight of 2-butene-1,4-diol (manufactured by Tokyo Chemical Industry Co., Ltd.), trans-2,3-dibromo-1,4-butenediol (Tokyo Kasei) which is a bromine-based activator Kogyo Co., Ltd.) is 1.6% by weight, base resin is acrylated rosin (Arakawa Chemical Industries, Ltd.) 44% by weight, antioxidant is pentaerythritol tetrakis [3- (3,5- Di-tert-butyl-4-hydroxyphenyl) propionate] (Irganox 1010, manufactured by Ciba Japan Co., Ltd.) 0.5% by weight, hexyl diglycol as a solvent (produced by Nippon Emulsifier Co., Ltd.) 34.9% by weight, 3% by weight of sebacic acid (produced by Tokyo Chemical Industry Co., Ltd.)
- a lead-free solder paste was prepared using a solder powder having a particle size of 10 to 25 ⁇ m and an alloy composition of Sn96.5 wt% -Ag 3.0 wt% -copper 0.5 wt% to this flux composition.
- the amount of bromine contained in this solder paste was 10400 ppm relative to the total amount of the flux composition as measured by combustion ion chromatography (AQF-100 manufactured by Dia Instruments Co., Ltd., using ICS-3000 manufactured by Dionex). .
- Table 3 shows the results of evaluation of wettability and storage stability of the lead-free solder paste thus obtained and the value of bromine.
- Example 2 In Example 1, trans-2,3-dibromo-1,4-butenediol (manufactured by Tokyo Chemical Industry Co., Ltd.), which is a bromine-based activator, was changed to 0.8% by weight, and acrylated rosin as a base resin A lead-free solder paste was obtained in the same manner as in Example 1 except that Arakawa Chemical Industries, Ltd. was changed to 44.8% by weight. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 3 In Example 1, 2-butene-1,4diol (manufactured by Tokyo Chemical Industry Co., Ltd.) was changed to 8% by weight, and hexyl diglycol (manufactured by Nippon Emulsifier Co., Ltd.) as a solvent was 28.9% by weight. A lead-free solder paste was obtained in the same manner as in Example 1 except that it was changed to. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 4 In Example 1, trans-2,3-dibromo-1,4-butenediol (manufactured by Tokyo Chemical Industry Co., Ltd.), which is a bromine-based activator, was changed to 3.7% by weight, and acrylated as a base resin. A lead-free solder paste was obtained in the same manner as in Example 1 except that rosin (manufactured by Arakawa Chemical Co., Ltd.) was changed to 41.9% by weight. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 5 In Example 1, 2-butene-1,4diol (manufactured by Tokyo Chemical Industry Co., Ltd.) was not used but 2% by weight of 2-hepten-1-ol (manufactured by Tokyo Chemical Industry Co., Ltd.) was used. Obtained a lead-free solder paste in the same manner as in Example 1. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 6 In Example 1, 2-butene-1,4 diol (manufactured by Tokyo Chemical Industry Co., Ltd.) was not used but 2% by weight of 5-hexen-1-ol (manufactured by Tokyo Chemical Industry Co., Ltd.) was used. Obtained a lead-free solder paste in the same manner as in Example 1. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 7 In Example 1, trans-2,3-dibromo-1,4-butenediol (manufactured by Tokyo Chemical Industry Co., Ltd.), which is a bromine-based activator, was changed to 0.1% by weight, and acrylated as a base resin. A lead-free solder paste was obtained in the same manner as in Example 1 except that rosin (Arakawa Chemical Industries, Ltd.) was changed to 45.5% by weight. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 8 In Example 5, 2-hepten-1-ol (manufactured by Tokyo Chemical Industry Co., Ltd.) was changed to 1% by weight, and hexyl diglycol (manufactured by Nippon Emulsifier Co., Ltd.) was changed to 35.9% by weight. Obtained a lead-free solder paste in the same manner as in Example 5. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 9 In Example 5, 2-hepten-1-ol (manufactured by Tokyo Chemical Industry Co., Ltd.) was changed to 9.5% by weight, and hexyl diglycol (manufactured by Nippon Emulsifier Co., Ltd.) was changed to 27.4% by weight. A lead-free solder paste was obtained in the same manner as in Example 5 except that. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 10 Example 1 was the same as Example 1 except that the base resin was changed to 33% by weight of acrylated rosin (manufactured by Arakawa Chemical Co., Ltd.) and 11% by weight of hydrogenated rosin (manufactured by Arakawa Chemical Co., Ltd.). A lead-free solder paste was obtained. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 11 Example 1 was the same as Example 1 except that the base resin was changed to 22% by weight of acrylated rosin (manufactured by Arakawa Chemical Industries) and 22% by weight of hydrogenated rosin (manufactured by Arakawa Chemical Industries). A lead-free solder paste was obtained. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 12 In Example 1, the lead-free activator was changed to 1.6% by weight of 2,3-dibromo-2,3-dimethylbutane (manufactured by Tokyo Chemical Industry Co., Ltd.). A solder paste was obtained. Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 13 Lead-free solder in the same manner as in Example 1 except that the brominated activator in Example 1 was changed to 1.6% by weight of trans-1,4-dibromo-2-butene (manufactured by Tokyo Chemical Industry Co., Ltd.). A paste was obtained.
- Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 14 In Example 1, a lead-free solder paste was obtained in the same manner as in Example 1 except that sebacic acid as an activator was changed to 3.0% by weight of succinic acid (manufactured by Tokyo Chemical Industry Co., Ltd.). Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 15 In Example 1, a lead-free solder paste was obtained in the same manner as in Example 1 except that sebacic acid as an activator was changed to 3.0% by weight of eicosanedioic acid (manufactured by Tokyo Chemical Industry Co., Ltd.). Table 3 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 1 Comparative Example 1 In Example 1, 46% by weight of acrylated rosin (manufactured by Arakawa Chemical Industries, Ltd.) as a base resin without using 2-butene-1,4-diol, and sebacic acid as an activator (Tokyo Chemical Industry ( Lead-free solder in the same manner as in Example 1 except that 3.5% by weight of the product) and hydrogenated dimer acid (PRIPOL 1010, manufactured by Unikema Co., Ltd.) as the activator were changed to 5.5% by weight. A paste was obtained. Table 4 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 2 In Example 1, 0.5% by weight of 2-butene-1,4-diol (manufactured by Tokyo Chemical Industry Co., Ltd.) and 45.5% by weight of acrylated rosin (manufactured by Arakawa Chemical Industries, Ltd.) as a base resin %, Sebacic acid as an activator (manufactured by Tokyo Chemical Industry Co., Ltd.) is changed to 3.5% by weight, and hydrogenated dimer acid as an activator (PRIPOL 1010, manufactured by Unikema Co., Ltd.) is changed to 5.5% by weight. A lead-free solder paste was obtained in the same manner as in Example 1 except that. Table 4 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- Example 3 In Example 1, 5.9% by weight of trans-2,3-dibromo-1,4-butenediol (manufactured by Tokyo Chemical Industry Co., Ltd.) as a bromine-based activator and acrylated rosin as a base resin (Arakawa) (Chemical Industry Co., Ltd.) 39.7% by weight, activator sebacic acid (Tokyo Chemical Industry Co., Ltd.) 3.5% by weight, activator hydrogenated dimer acid (PRIPOL 1010, Co., Ltd.) A lead-free solder paste was obtained in the same manner as in Example 1 except that the product was changed to 5.5% by weight. Table 4 shows the results of evaluation of wettability and storage stability, and the value of bromine amount.
- the antioxidant is Irganox 1010
- the solvent is hexyl diglycol
- the brominated activator 1 is trans-2,3-dibromo-1,4-butenediol
- the brominated activator 2 is 2,3- Dibromo-2,3-dimethylbutane
- bromine-based activator 3 is trans-1,4-dibromo-2-butene
- activator 1 is succinic acid
- activator 2 is sebacic acid
- activator 3 is eicosane Diacid
- activator 4 represents PRIPOL 1010
- thixotropic agent represents MAWAXO.
- the antioxidant is Irganox 1010
- the solvent is hexyl diglycol
- the brominated activator 1 is trans-2,3-dibromo-1,4-butenediol
- the activator 2 is sebacic acid
- the activator 4 Represents PRIPOL 1010
- the thixotropic agent represents MAWAXO.
Abstract
Description
及び/又は一般式(2):
で表わされる炭素二重結合化合物を1~10重量%含有することを特徴とする鉛フリーハンダ用フラックス組成物である。
及び/又は一般式(2) :
で表わされる炭素二重結合化合物を1~10重量%含むものである。
(1)保存安定性の評価
保存安定性はハンダペーストを40℃の恒温槽中に24時間保持した温度加速試験により0℃~10℃の冷蔵状態での三か月以上の保管の可否を評価した。
ハンダペースト調製後及び40℃、24時間等温保持後のハンダペーストの10rpmにおける粘度を、マルコム社製PCU-205型スパイラル粘度計を用いて測定した。増粘率は下記計算式より算出した。増粘率が10%未満である場合には測定誤差も考慮して増粘していないとみなした。ハロゲン物質とハンダ金属との反応に起因した増粘の活性化エネルギーはおよそ150kJ/molであることから、本試験により4℃冷蔵保存での約3年間に相当する安定性が評価できる。
増粘率=(40℃、24時間後の10rpmの粘度-ハンダペースト調製後の10rpmの粘度)÷(ハンダペースト調整後の10rpmの粘度)×100
ディウェッテイング試験により、大気雰囲気下での加熱、リフローにおける銅板に対する濡れ性を評価した。濡れ性の評価はJIS Z 3284 附属書10に準拠して行った。評価は採点方式とし銅電極基板に対して不濡れが無く試験板に塗布した以上に濡れ広がった物に関しては1、銅電極に対して塗布した部分が全て濡れ広がった物に関しては2、若干不濡れが生じたものに関しては3、銅電極基板に対して全く濡れなかった物に関しては4とした。又ハンダペースト調製後、40℃、24時間経過後においても同様の試験を行った。なお、上記評価では「1」又は「2」のものを濡れ性が優れていると判断した。
表1に示す組成となるように、フラックス組成物を調製した。具体的には、2-ブテン-1,4-ジオール(東京化成工業(株)製)2重量%、臭素系活性剤であるtrans-2,3-ジブロモ-1,4-ブテンジオール(東京化成工業(株)製)を1.6重量%とし、ベース樹脂であるアクリル化ロジン(荒川化学工業(株)製)44重量%、酸化防止剤であるペンタエリスリトールテトラキス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオネート](Irganox1010、チバ・ジャパン(株)製)0.5重量%、溶剤であるヘキシルジグリコール(日本乳化剤(株)製)34.9重量%、活性剤であるセバシン酸(東京化成工業(株)製)3重量%、水添ダイマー酸(PRIPOL 1010、(株)ユニケマ製)6重量%、チクソトロピック剤である12-ヒドロキシステアリン酸エチレンビスアミド(MAWAXO、川研ファインケミカル(株)製)8重量%を用いて混合し、鉛フリーハンダ用フラックス組成物を調製した。このフラックス組成物に粒子径が10~25μm、合金組成がSn96.5重量%-Ag3.0重量%-銅0.5重量%のハンダ粉末を用いて鉛フリーハンダペーストを調製した。燃焼イオンクロマト法((株)ダイアインスツルメンツ製 AQF-100型、ダイオネクス社製 ICS-3000を使用)によって測定した、このハンダペーストに含まれる臭素量はフラックス組成物全体量に対して10400ppmであった。このようにして得られた鉛フリーハンダペーストの濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において臭素系活性剤であるtrans-2,3-ジブロモ-1,4-ブテンジオール(東京化成工業(株)製)を0.8重量%に変更し、ベース樹脂であるアクリル化ロジン(荒川化学工業(株)製)を44.8重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、2-ブテン-1,4ジオール(東京化成工業(株)製)を8重量%に変更し、溶剤であるヘキシルジグリコール(日本乳化剤(株)製)を28.9重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、臭素系活性剤であるtrans-2,3-ジブロモ-1,4-ブテンジオール(東京化成工業(株)製)を3.7重量%に変更し、ベース樹脂であるアクリル化ロジン(荒川化学工業(株)製)を41.9重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、2-ブテン-1,4ジオール(東京化成工業(株)製)を用いずに、2-ヘプテン-1-オール(東京化成工業(株)製)を2重量%用いた以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、2-ブテン-1,4ジオール(東京化成工業(株)製)を用いずに、5-ヘキセン-1-オール(東京化成工業(株)製)を2重量%用いた以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、臭素系活性剤であるtrans-2,3-ジブロモ-1,4-ブテンジオール(東京化成工業(株)製)を0.1重量%に変更し、ベース樹脂であるアクリル化ロジン(荒川化学工業(株)製)を45.5重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例5において、2-ヘプテン-1-オール(東京化成工業(株)製)を1重量%に変更し、ヘキシルジグリコール(日本乳化剤(株)製)を35.9重量%に変更した以外は実施例5と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例5において、2-ヘプテン-1-オール(東京化成工業(株)製)を9.5重量%に変更し、ヘキシルジグリコール(日本乳化剤(株)製)を27.4重量%に変更した以外は実施例5と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、ベース樹脂をアクリル化ロジン(荒川化学工業(株)製)33重量%及び水添ロジン(荒川化学工業(株)製)11重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、ベース樹脂をアクリル化ロジン(荒川化学工業(株)製)22重量%及び水添ロジン(荒川化学工業(株)製)22重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、臭素系活性剤を2,3-ジブロモ-2,3-ジメチルブタン(東京化成工業(株)製)1.6重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、臭素系活性剤をtrans-1,4-ジブロモ-2-ブテン(東京化成工業(株)製)1.6重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、活性剤であるセバシン酸をコハク酸(東京化成工業(株)製)3.0重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において、活性剤であるセバシン酸をエイコサン二酸(東京化成工業(株)製)3.0重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表3に示す。
実施例1において2-ブテン-1,4-ジオールを用いずに、ベース樹脂であるアクリル化ロジン(荒川化学工業(株)製)を46重量%、活性剤であるセバシン酸(東京化成工業(株)製)を3.5重量%、活性剤である水添ダイマー酸(PRIPOL 1010、(株)ユニケマ製)を5.5重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表4に示す。
実施例1において2-ブテン-1,4-ジオール(東京化成工業(株)製)を0.5重量%、ベース樹脂であるアクリル化ロジン(荒川化学工業(株)製)を45.5重量%、活性剤であるセバシン酸(東京化成工業(株)製)を3.5重量%、活性剤である水添ダイマー酸(PRIPOL 1010、(株)ユニケマ製)を5.5重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表4に示す。
実施例1において臭素系活性剤であるtrans-2,3-ジブロモ-1,4-ブテンジオール(東京化成工業(株)製)を5.9重量%、ベース樹脂であるアクリル化ロジンを(荒川化学工業(株)製)を39.7重量%、活性剤であるセバシン酸(東京化成工業(株)製)を3.5重量%、活性剤である水添ダイマー酸(PRIPOL 1010、(株)ユニケマ製)を5.5重量%に変更した以外は実施例1と同様にして鉛フリーハンダペーストを得た。濡れ性、保存安定性の評価の結果及び臭素量の値を表4に示す。
Claims (6)
- 炭素二重結合化合物が、2-ブテン-1,4-ジオール、2-ヘプテン-1-オール及び5-ヘキセン-1-オールからなる群より選ばれた一種以上の化合物であることを特徴とする請求項1に記載の鉛フリーハンダ用フラックス組成物。
- アクリル化ロジン及び水添ロジンからなる群より選ばれる少なくとも1種を含有することを特徴とする請求項1に記載の鉛フリーハンダ用フラックス組成物。
- 分子内に臭素を2つ以上含有する分子量200以上の化合物を含有することを特徴とする請求項1に記載の鉛フリーハンダ用フラックス組成物。
- 炭素数が4~20であるジカルボン酸を含有することを特徴とする請求項1に記載の鉛フリーハンダ用フラックス組成物。
- ハンダ粉末及び請求項1~5のいずれかに記載の鉛フリーハンダ用フラックス組成物を含有することを特徴とする鉛フリーハンダペースト。
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JP2017064783A (ja) * | 2015-09-30 | 2017-04-06 | 株式会社タムラ製作所 | フラックス組成物およびソルダペースト |
JP2021154389A (ja) * | 2020-03-26 | 2021-10-07 | 株式会社タムラ製作所 | はんだ組成物および電子基板 |
JP2021185003A (ja) * | 2018-09-27 | 2021-12-09 | 株式会社タムラ製作所 | はんだ組成物および電子基板 |
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JP6322881B1 (ja) * | 2017-12-21 | 2018-05-16 | 千住金属工業株式会社 | フラックス及びフラックス用樹脂組成物 |
EP3954796A4 (en) * | 2019-04-11 | 2023-04-26 | Harima Chemicals, Incorporated | FLUX, SOLDER PASTE AND ELECTRONIC CIRCUIT BOARD |
JP6928295B1 (ja) * | 2020-10-02 | 2021-09-01 | 千住金属工業株式会社 | フラックス及びソルダペースト |
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