TWI810336B - Conductive paste, electronic parts, and multilayer ceramic capacitors - Google Patents
Conductive paste, electronic parts, and multilayer ceramic capacitors Download PDFInfo
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- TWI810336B TWI810336B TW108126220A TW108126220A TWI810336B TW I810336 B TWI810336 B TW I810336B TW 108126220 A TW108126220 A TW 108126220A TW 108126220 A TW108126220 A TW 108126220A TW I810336 B TWI810336 B TW I810336B
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- 239000002270 dispersing agent Substances 0.000 claims abstract description 118
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- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
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- DIOYAVUHUXAUPX-KHPPLWFESA-N Oleoyl sarcosine Chemical group CCCCCCCC\C=C/CCCCCCCC(=O)N(C)CC(O)=O DIOYAVUHUXAUPX-KHPPLWFESA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
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- FAFMZORPAAGQFV-BREBYQMCSA-N [(1r,3r,4r)-4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl] propanoate Chemical compound C1C[C@@]2(C)[C@H](OC(=O)CC)C[C@@H]1C2(C)C FAFMZORPAAGQFV-BREBYQMCSA-N 0.000 description 1
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- DIICMQCJAQLQPI-UHFFFAOYSA-N isobornyl propionate Natural products CCC(=O)C1CC2CCC1(C)C2(C)C DIICMQCJAQLQPI-UHFFFAOYSA-N 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
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- RCHKEJKUUXXBSM-UHFFFAOYSA-N n-benzyl-2-(3-formylindol-1-yl)acetamide Chemical compound C12=CC=CC=C2C(C=O)=CN1CC(=O)NCC1=CC=CC=C1 RCHKEJKUUXXBSM-UHFFFAOYSA-N 0.000 description 1
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- 229910052721 tungsten Inorganic materials 0.000 description 1
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- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
Abstract
本發明提供一種導電性漿料，其具有較高的乾燥膜表面平滑性及較高的乾燥膜密度，導電性粉末的分散性優異，並且在形成積層體時具有較高的黏附性，並且，隨時間的黏度變化非常小，黏度穩定性更加優異。該導電性漿料含有導電性粉末、陶瓷粉末、分散劑、黏合劑樹脂以及有機溶劑，分散劑含有說明書中記載的通式(1)所示的胺基酸系分散劑及說明書中記載的通式(2)所示的胺系分散劑，胺基酸系分散劑與前述胺系分散劑的配比(胺基酸系分散劑/胺系分散劑)以質量比計為1/4以上1/2以下的範圍，相對於導電性漿料的總量，胺基酸系分散劑及前述胺系分散劑的合計含量為0.7質量%以上1.2質量%以下。 The present invention provides a conductive paste having high dry film surface smoothness and high dry film density, excellent dispersibility of conductive powder, and high adhesion when forming a laminate, and, The viscosity change with time is very small, and the viscosity stability is more excellent. The conductive paste contains conductive powder, ceramic powder, a dispersant, a binder resin, and an organic solvent, and the dispersant contains the amino acid-based dispersant represented by the general formula (1) described in the specification and the general formula described in the specification. For the amine dispersant represented by formula (2), the ratio of the amino acid dispersant to the aforementioned amine dispersant (amino acid dispersant/amine dispersant) is 1/4 or more by mass ratio In the range of /2 or less, the total content of the amino acid-based dispersant and the aforementioned amine-based dispersant is 0.7% by mass or more and 1.2% by mass or less with respect to the total amount of the conductive paste.
Description
本發明關於一種導電性漿料、電子零件以及積層陶瓷電容器。 The present invention relates to a conductive paste, an electronic component, and a laminated ceramic capacitor.
伴隨行動電話、數位設備等電子設備的小型化以及高性能化，對於包括積層陶瓷電容器等的電子零件亦期望小型化以及高容量化。積層陶瓷電容器具有將多個電介質層及多個內部電極層交替積層而成的結構，藉由使上述電介質層以及內部電極層薄膜化而能夠實現小型化以及高容量化。 Along with the miniaturization and high performance of electronic equipment such as mobile phones and digital devices, miniaturization and high capacity are also desired for electronic components including multilayer ceramic capacitors. A multilayer ceramic capacitor has a structure in which a plurality of dielectric layers and a plurality of internal electrode layers are alternately laminated, and by reducing the thickness of the dielectric layers and internal electrode layers, miniaturization and high capacity can be achieved.
例如，可以藉由如下方式來製造積層陶瓷電容器。首先，在含有鈦酸鋇(BaTiO3)等電介質粉末以及黏合劑樹脂的生片的表面上，以規定的電極圖案印刷(塗布)內部電極用的導電性漿料，並進行乾燥而形成乾燥膜。接著，以使乾燥膜及生片交替地重疊的方式進行積層並加熱壓接而形成一體化狀態的積層體。將該積層體切斷，在氧化性氣氛或惰性氣氛中實施脫有機黏合劑處理之後進行燒製，得到燒製晶片。接著，在燒製晶片的兩端部塗布外部電極用漿料，在燒製後，在外部電極表面實施鍍鎳等，從而得到積層陶瓷電容器。 For example, a laminated ceramic capacitor can be manufactured as follows. First, on the surface of a green sheet containing a dielectric powder such as barium titanate (BaTiO 3 ) and a binder resin, a conductive paste for internal electrodes is printed (coated) in a predetermined electrode pattern, and dried to form a dry film. . Next, the dry film and the green sheet are laminated so that they are alternately stacked, and heated and pressure-bonded to form an integrated laminated body. The laminate is cut, subjected to an organic binder removal treatment in an oxidative atmosphere or an inert atmosphere, and then fired to obtain a fired wafer. Next, a paste for external electrodes is applied to both ends of the fired wafer, and after firing, nickel plating or the like is performed on the surface of the external electrodes to obtain a multilayer ceramic capacitor.
一般而言，用於形成內部電極層的導電性漿料含有導電性粉末、陶瓷粉末、黏合劑樹脂以及有機溶劑。另外，為了提高導電性粉末等的分散性，導電性漿料有時含有分散劑。伴隨近年來的內部電極層的薄膜化，導電性粉末亦存在小粒徑化的傾向。在導電性粉末的粒徑較小的情況下，其顆粒表面的比表面積變大，因此導電性粉末(金屬粉末)的表面活性變高，存在產生分散性降低、黏度特性降低的情況。 Generally, a conductive paste for forming internal electrode layers contains conductive powder, ceramic powder, binder resin, and organic solvent. Moreover, in order to improve the dispersibility of electroconductive powder etc., electroconductive paste may contain a dispersing agent. Along with the reduction in the thickness of the internal electrode layer in recent years, the particle size of the conductive powder also tends to be reduced. When the particle size of the conductive powder is small, the specific surface area of the particle surface becomes large, so the surface activity of the conductive powder (metal powder) becomes high, and the dispersibility and viscosity characteristics may decrease.
因此，嘗試對導電性漿料的隨時間的黏度特性進行改善。例如，在專利文獻1中記載有一種導電性漿料，其至少含有金屬成分、氧化物、分散劑及黏合劑樹脂，金屬成分係其表面組成具有特定的組成比的Ni粉末，分散劑的酸點量為500~2000μmol/g，黏合劑樹脂的酸點量為15~100μmol/g。而且，根據專利文獻1，該導電性漿料具有良好的分散性及黏度穩定性。 Therefore, an attempt has been made to improve the temporal viscosity characteristics of the conductive paste. For example, Patent Document 1 describes a conductive paste containing at least a metal component, an oxide, a dispersant, and a binder resin. The metal component is Ni powder whose surface composition has a specific composition ratio. The acid of the dispersant The point amount is 500~2000μmol/g, and the acid point amount of the binder resin is 15~100μmol/g. Furthermore, according to Patent Document 1, the conductive paste has good dispersibility and viscosity stability.
另外，在專利文獻2中記載有一種內部電極用導電性漿料，其由導電性粉末、樹脂、有機溶劑、以TiBaO3為主的陶瓷粉末的共材以及凝集抑制劑構成，其中，上述凝集抑制劑的含量為0.1重量%以上5重量%以下，上述凝集抑制劑係以特定的結構式表示的叔胺或仲胺。根據專利文獻2，該內部電極用導電漿料抑制共材成分的凝集，長期保管性優異，能夠實現積層陶瓷電容器的薄膜化。 In addition, Patent Document 2 describes a conductive paste for internal electrodes, which is composed of a conductive powder, a resin, an organic solvent, a co-material of ceramic powder mainly composed of TiBaO 3 , and an aggregation inhibitor, wherein the above-mentioned aggregation The content of the inhibitor is not less than 0.1% by weight and not more than 5% by weight, and the above-mentioned aggregation inhibitor is a tertiary or secondary amine represented by a specific structural formula. According to Patent Document 2, this conductive paste for internal electrodes suppresses aggregation of common material components, has excellent long-term storage properties, and can achieve thinner multilayer ceramic capacitors.
另一方面，在使內部電極層薄膜化時，要求藉由在生片表面上印刷內部電極用的導電性漿料並乾燥而得到的乾燥膜具有較高的密度。例如，在專利文獻3中已提出一種金屬超微粉漿料，其含有有機溶劑、表面活性劑以及金屬超微顆粒，其中，上述表面活性劑為油醯肌氨 酸，在上述金屬超微粉漿料中，含有70質量%以上95質量%以下的上述金屬超微粉，以上述金屬超微粉為100質量份計，含有超過0.05質量份且不足2.0質量份的上述表面活性劑。根據專利文獻3，藉由防止超微顆粒的凝集，能夠得到不存在凝集顆粒的、分散性以及乾燥膜密度優異的金屬超微粉漿料。 On the other hand, when thinning the internal electrode layer, the dry film obtained by printing and drying the conductive paste for internal electrodes on the surface of the green sheet is required to have a high density. For example, a metal ultrafine powder slurry has been proposed in Patent Document 3, which contains an organic solvent, a surfactant, and metal ultrafine particles, wherein the above-mentioned surfactant is oleoyl sarcosine, and in the above-mentioned metal ultrafine powder slurry , containing 70% by mass to 95% by mass of the above-mentioned ultrafine metal powder, based on 100 parts by mass of the above-mentioned ultrafine metal powder, containing more than 0.05 mass parts and less than 2.0 mass parts of the above-mentioned surfactant. According to Patent Document 3, by preventing the aggregation of ultrafine particles, a metal ultrafine powder slurry having no aggregated particles and excellent dispersibility and dry film density can be obtained.
【專利文獻1】 日本特開2015-216244號公報 [Patent Document 1] Japanese Patent Laid-Open No. 2015-216244
【專利文獻2】 日本特開2013-149457號公報 [Patent Document 2] Japanese Patent Laid-Open No. 2013-149457
【專利文獻3】 日本特開2006-063441號公報 [Patent Document 3] Japanese Patent Laid-Open No. 2006-063441
然而，隨著近年來的電極圖案的薄膜化而要求進一步提高隨時間的黏度特性以及提高塗布後的乾燥膜的表面平滑性。 However, along with the thinning of electrode patterns in recent years, it is required to further improve the viscosity characteristics over time and improve the surface smoothness of the dried film after coating.
鑒於如此之狀況，本發明的目的在於提供一種導電性漿料，其具有較高的乾燥膜表面平滑性及較高的乾燥膜密度，導電性粉末的分散性優異，並且在形成積層體時具有較高的黏附性，並且，隨時間的黏度變化非常小，黏度穩定性更加優異。 In view of such a situation, the object of the present invention is to provide an electroconductive paste having high dry film surface smoothness and high dry film density, excellent dispersibility of electroconductive powder, and excellent High adhesion, and the viscosity change with time is very small, and the viscosity stability is more excellent.
本發明之第一態樣提供一種導電性漿料，其含有導電性粉末、陶瓷粉末、分散劑、黏合劑樹脂以及有機溶劑，其特徵係分散劑含有下述通式(1)所示的胺基酸系分散劑及下述通式(2)所示的胺系分散劑，胺基酸系分散劑與胺系分散劑的配比(胺基酸系分散劑/胺系分散劑)以質量比計為1/4以上1/2以下的範圍，相對於導電性漿料的總量，胺基酸系分散劑及胺系分散劑的合計含量為0.7質量%以上1.2質量%以下。 The first aspect of the present invention provides a conductive paste, which contains conductive powder, ceramic powder, dispersant, binder resin and organic solvent, characterized in that the dispersant contains amine represented by the following general formula (1) The ratio of amino acid dispersant and amine dispersant (amino acid dispersant/amine dispersant) by mass The ratio is in the range of not less than 1/4 and not more than 1/2, and the total content of the amino acid-based dispersant and the amine-based dispersant is not less than 0.7% by mass and not more than 1.2% by mass relative to the total amount of the conductive paste.
(其中，在式(1)中，R1表示碳原子數為10~20的鏈狀烴基。) (wherein, in formula (1), R 1 represents a chain hydrocarbon group with 10 to 20 carbon atoms.)
(其中，在式(2)中，R2表示碳原子數為8~16的烷基、烯基或炔基，R3表示氧化乙烯基、氧化丙烯基或亞甲基，R4表示氧化乙烯基或氧化 丙烯基，R3及R4可以相同或者亦可以不同。式(2)中的N原子不與R3以及R4中的O原子直接鍵合，Y為0~2的數值，Z為1~2的數值。) (wherein, in formula (2), R 2 represents an alkyl, alkenyl or alkynyl group with 8 to 16 carbon atoms, R 3 represents an oxyethylene group, an oxypropylene group or a methylene group, and R 4 represents an oxyethylene group group or oxypropylene group, R3 and R4 can be the same or different. The N atom in formula (2) is not directly bonded to the O atom in R3 and R4 , Y is the value of 0~2, Z It is a value from 1 to 2.)
另外，在通式(1)中，R1理想表示碳原子數為10~20的直鏈狀烴基。另外，導電性粉末理想含有選自Ni、Pd、Pt、Au、Ag、Cu以及上述元素之合金中的至少一種的金屬粉末。另外，相對於導電性漿料的總量，理想含有40質量%以上60質量%以下的導電性粉末。另外，導電性粉末的平均粒徑理想為0.05μm以上1.0μm以下。另外，陶瓷粉末理想含有鈣鈦礦型氧化物。另外，陶瓷粉末的平均粒徑理想為0.01μm以上0.5μm以下。另外，黏合劑樹脂理想含有纖維素系樹脂、丙烯酸系樹脂以及丁醛系樹脂中的至少一種。另外，上述導電性漿料理想用於積層陶瓷電容器的內部電極。 In addition, in the general formula (1), R 1 ideally represents a linear hydrocarbon group having 10 to 20 carbon atoms. In addition, the conductive powder preferably contains at least one metal powder selected from the group consisting of Ni, Pd, Pt, Au, Ag, Cu, and alloys of the above elements. Moreover, it is desirable to contain 40 mass % or more and 60 mass % or less of electroconductive powder with respect to the total amount of electroconductive paste. In addition, the average particle diameter of the conductive powder is preferably not less than 0.05 μm and not more than 1.0 μm. In addition, the ceramic powder preferably contains a perovskite-type oxide. In addition, the average particle diameter of the ceramic powder is preferably not less than 0.01 μm and not more than 0.5 μm. In addition, the binder resin desirably contains at least one of cellulose-based resins, acrylic resins, and butyral-based resins. Moreover, the said electroconductive paste is ideally used for the internal electrode of a laminated ceramic capacitor.
本發明之第二態樣提供一種使用上述導電性漿料而形成的電子零件。 A second aspect of the present invention provides an electronic component formed using the above-mentioned conductive paste.
本發明之第三態樣提供一種積層陶瓷電容器，其具有將使用上述導電性漿料而形成的內部電極層及電介質層積層而成的積層體。 A third aspect of the present invention provides a laminated ceramic capacitor having a laminate in which internal electrode layers and dielectric layers formed using the above-mentioned conductive paste are laminated.
本發明的導電性漿料在隨時間的黏度變化非常小、黏度穩定性更加優異的同時，導電性粉末的分散性優異，在塗布後的乾燥膜中具有較高的表面平滑性及較高的乾燥膜密度。另外，在形成薄膜化的電極時，使用本發明的導電性漿料而形成的積層陶瓷電容器等電子零件的電極圖案在導電性漿料的黏附性方面亦很優異，精度良好且具有均勻的寬度以 及厚度。 The conductive paste of the present invention has a very small change in viscosity over time and is more excellent in viscosity stability. At the same time, it has excellent dispersibility of conductive powder, and has high surface smoothness and high viscosity in the dried film after coating. Dry film density. In addition, when forming thinned electrodes, the electrode pattern of electronic components such as laminated ceramic capacitors formed using the conductive paste of the present invention is also excellent in the adhesion of the conductive paste, and has good precision and uniform width. and thickness.
1‧‧‧積層陶瓷電容器 1‧‧‧Multilayer Ceramic Capacitors
10‧‧‧陶瓷積層體 10‧‧‧Ceramic laminate
11‧‧‧內部電極層 11‧‧‧internal electrode layer
12‧‧‧電介質層 12‧‧‧dielectric layer
20‧‧‧外部電極 20‧‧‧External electrodes
21‧‧‧外部電極層 21‧‧‧External electrode layer
22‧‧‧電鍍層 22‧‧‧Electroplating layer
【圖1A】係表示本實施型態所關於之積層陶瓷電容器的立體圖。 [FIG. 1A] is a perspective view showing a multilayer ceramic capacitor related to this embodiment.
【圖1B】係表示本實施型態所關於之積層陶瓷電容器的剖視圖。 [ Fig. 1B ] is a cross-sectional view showing a multilayer ceramic capacitor according to this embodiment.
本實施型態的導電性漿料含有導電性粉末、陶瓷粉末、分散劑、黏合劑樹脂以及有機溶劑。以下，對各成分進行詳細說明。 The conductive paste of this embodiment contains conductive powder, ceramic powder, a dispersant, a binder resin, and an organic solvent. Each component will be described in detail below.
(導電性粉末) (conductive powder)
對導電性粉末並無特別限定，可以使用金屬粉末，例如可以使用選自Ni、Pd、Pt、Au、Ag、Cu以及上述元素之合金的一種以上的粉末。其中，從導電性、耐腐蝕性以及成本的觀點出發，理想為Ni或其合金的粉末。作為Ni合金，例如可以使用選自由Mn、Cr、Co、Al、Fe、Cu、Zn、Ag、Au、Pt以及Pd組成的群組中的至少一種以上的元素與Ni的合金(Ni合金)。Ni合金中的Ni的含量例如為50質量%以上，理想為80質量%以上。另外，為了抑制脫黏合劑處理時的、由黏合劑樹脂的部分的熱分解而導致的劇烈的氣體產生，Ni粉末可以含有幾百ppm程度的S。 The conductive powder is not particularly limited, and metal powder can be used, for example, one or more powders selected from Ni, Pd, Pt, Au, Ag, Cu, and alloys of the above elements can be used. Among them, powder of Ni or its alloy is preferable from the viewpoint of electrical conductivity, corrosion resistance, and cost. As the Ni alloy, for example, an alloy (Ni alloy) of at least one element selected from the group consisting of Mn, Cr, Co, Al, Fe, Cu, Zn, Ag, Au, Pt, and Pd and Ni can be used. The content of Ni in the Ni alloy is, for example, 50% by mass or more, preferably 80% by mass or more. In addition, the Ni powder may contain S on the order of several hundred ppm in order to suppress violent gas generation due to partial thermal decomposition of the binder resin during the binder removal process.
導電性粉末的平均粒徑理想為0.05μm以上1.0μm以下，更理想為0.1μm以上0.5μm以下。在導電性粉末的平均粒徑為上述範圍內的情況下，能夠適宜用作薄膜化的積層陶瓷電容器的內部電極用漿料，例 如，可提高乾燥膜的平滑性以及乾燥膜密度。平均粒徑係根據基於掃描型電子顯微鏡(SEM)的觀察而求出的值，係從藉由SEM以10,000倍的倍率進行觀察而得到的圖像中逐個測定多個顆粒的粒徑而得到的平均值。 The average particle diameter of the conductive powder is preferably from 0.05 μm to 1.0 μm, more preferably from 0.1 μm to 0.5 μm. When the average particle size of the conductive powder is within the above range, it can be suitably used as a slurry for an internal electrode of a thinned multilayer ceramic capacitor, for example, the smoothness and dry film density of the dry film can be improved. The average particle diameter is a value obtained by observation with a scanning electron microscope (SEM), and is obtained by measuring the particle diameters of a plurality of particles one by one from an image obtained by observing with a SEM at a magnification of 10,000 times. average value.
導電性粉末的含量相對於導電性漿料的總量理想為30質量%以上且不足70質量%，更理想為40質量%以上60質量%以下。在導電性粉末的含量為上述範圍內的情況下，導電性以及分散性優異。 The content of the conductive powder is preferably 30% by mass or more and less than 70% by mass relative to the total amount of the conductive paste, more preferably 40% by mass or more and 60% by mass or less. When content of electroconductive powder exists in the said range, electroconductivity and dispersibility are excellent.
(陶瓷粉末) (ceramic powder)
對陶瓷粉末並無特別限定，例如，在為積層陶瓷電容器的內部電極用漿料的情況下，可根據所應用的積層陶瓷電容器的種類而適當地選擇習知的陶瓷粉末。作為陶瓷粉末，例如可列舉為含有Ba以及Ti的鈣鈦礦型氧化物，理想為鈦酸鋇(BaTiO3)。 The ceramic powder is not particularly limited. For example, in the case of a slurry for internal electrodes of a laminated ceramic capacitor, a known ceramic powder can be appropriately selected according to the type of laminated ceramic capacitor to be used. Examples of the ceramic powder include perovskite-type oxides containing Ba and Ti, preferably barium titanate (BaTiO 3 ).
陶瓷粉末可以使用含有鈦酸鋇作為主成分、且含有氧化物作為副成分的陶瓷粉末。作為氧化物，可列舉為Mn、Cr、Si、Ca、Ba、Mg、V、W、Ta、Nb以及一種以上的稀土類元素的氧化物。如此之陶瓷粉末，例如可列舉為將鈦酸鋇(BaTiO3)的Ba原子、Ti原子以例如Sn、Pb、Zr等其他原子取代後的鈣鈦礦型氧化物強電介質的陶瓷粉末。 As the ceramic powder, a ceramic powder containing barium titanate as a main component and an oxide as a subcomponent can be used. Examples of oxides include oxides of Mn, Cr, Si, Ca, Ba, Mg, V, W, Ta, Nb, and one or more rare earth elements. Examples of such ceramic powders include perovskite-type oxide ferroelectric ceramic powders in which Ba atoms and Ti atoms of barium titanate (BaTiO 3 ) are substituted with other atoms such as Sn, Pb, and Zr.
在內部電極用漿料中，可以使用與構成積層陶瓷電容器生片的電介質陶瓷粉末相同組成的粉末。由此，可抑制由於燒結工序中的電介質層與內部電極層之間的介面處的收縮失配而導致的裂紋的產生。如此之陶瓷粉末，除了上述以外，例如，亦可列舉為ZnO、鐵氧體、PZT、BaO、Al2O3、Bi2O3、R(稀土類元素)2O3、TiO2、Nd2O3等氧化物。此外，陶瓷粉末可以使用一種，亦可以使用兩種以上。 In the slurry for internal electrodes, a powder having the same composition as that of the dielectric ceramic powder constituting the green sheet of the laminated ceramic capacitor can be used. Thereby, generation of cracks due to shrinkage mismatch at the interface between the dielectric layer and the internal electrode layer in the sintering process can be suppressed. Such ceramic powders include, for example, ZnO, ferrite, PZT, BaO, Al 2 O 3 , Bi 2 O 3 , R (rare earth elements) 2 O 3 , TiO 2 , and Nd 2 in addition to the above. O3 and other oxides. In addition, one type of ceramic powder may be used, or two or more types may be used.
陶瓷粉末的平均粒徑例如為0.01μm以上0.5μm以下，理想為0.01μm以上0.3μm以下的範圍。藉由使陶瓷粉末的平均粒徑在上述範圍內，在作為內部電極用漿料來使用的情況下，能夠形成足夠細薄且均勻的內部電極。平均粒徑係根據基於掃描型電子顯微鏡(SEM)的觀察而求出的值，係從藉由SEM以50,000倍的倍率進行觀察而得到的影像中逐個測定多個顆粒的粒徑而得到的平均值。 The average particle size of the ceramic powder is, for example, in a range of 0.01 μm to 0.5 μm, preferably in a range of 0.01 μm to 0.3 μm. When the average particle size of the ceramic powder is within the above range, when used as a slurry for internal electrodes, a sufficiently thin and uniform internal electrode can be formed. The average particle diameter is a value obtained by observation with a scanning electron microscope (SEM), and is an average value obtained by measuring the particle diameters of a plurality of particles one by one from images obtained by observing with a SEM at a magnification of 50,000 times. value.
以導電性粉末為100質量份計，陶瓷粉末的含量理想為1質量份以上30質量份以下，更理想為3質量份以上30質量份以下。 The content of the ceramic powder is preferably not less than 1 part by mass and not more than 30 parts by mass, more preferably not less than 3 parts by mass and not more than 30 parts by mass, based on 100 parts by mass of the conductive powder.
陶瓷粉末的含量相對於導電性漿料的總量理想為1質量%以上20質量%以下，更理想為5質量%以上20質量%以下。當陶瓷粉末的含量為上述範圍內的情況下，導電性以及分散性優異。 The content of the ceramic powder is preferably not less than 1% by mass and not more than 20% by mass relative to the total amount of the conductive paste, more preferably not less than 5% by mass and not more than 20% by mass. When the content of the ceramic powder is within the above range, the conductivity and dispersibility are excellent.
(黏合劑樹脂) (Binder resin)
對黏合劑樹脂並無特別限定，可以使用習知的樹脂。作為黏合劑樹脂，例如可列舉為甲基纖維素、乙基纖維素、乙基羥基乙基纖維素、硝基纖維素等纖維素系樹脂、丙烯酸系樹脂、聚乙烯醇縮丁醛等丁醛系樹脂等。其中，從相對於溶劑的溶解性、燃燒分解性的觀點等出發，理想含有乙基纖維素。另外，在用作內部電極用漿料的情況下，從提高與生片之間的黏合強度的觀點出發，可以含有丁醛系樹脂，或者可以單獨使用丁醛系樹脂。黏合劑樹脂可以使用一種，亦可以使用兩種以上。黏合劑樹脂例如可以使用纖維素系樹脂及丁醛系樹脂。另外，黏合劑樹脂的分子量例如為20000~200000的大小。 The binder resin is not particularly limited, and known resins can be used. Examples of the binder resin include cellulose-based resins such as methylcellulose, ethylcellulose, ethylhydroxyethylcellulose, and nitrocellulose; acrylic resins; butyrals such as polyvinyl butyral; Department of resin, etc. Among them, it is desirable to contain ethyl cellulose from the viewpoint of solubility in a solvent, combustion decomposability, and the like. In addition, when used as a slurry for internal electrodes, a butyral-based resin may be contained, or a butyral-based resin may be used alone, from the viewpoint of improving the bonding strength with a green sheet. One kind of binder resin may be used, and two or more kinds may be used. As the binder resin, for example, cellulose-based resin and butyral-based resin can be used. In addition, the molecular weight of the binder resin is, for example, 20,000 to 200,000.
以導電性粉末為100質量份計，黏合劑樹脂的含量理想為 1質量份以上10質量份以下，更理想為1質量份以上8質量份以下。 The content of the binder resin is preferably not less than 1 part by mass and not more than 10 parts by mass, more preferably not less than 1 part by mass and not more than 8 parts by mass, based on 100 parts by mass of the conductive powder.
黏合劑樹脂的含量相對於導電性漿料的總量理想為0.5質量%以上10質量%以下，更理想為1質量%以上6質量%以下。在黏合劑樹脂的含量為上述範圍內的情況下，導電性以及分散性優異。 The content of the binder resin is preferably from 0.5% by mass to 10% by mass with respect to the total amount of the conductive paste, more preferably from 1% by mass to 6% by mass. When content of binder resin is in the said range, electroconductivity and dispersibility are excellent.
(有機溶劑) (Organic solvents)
對有機溶劑並無特別限定，可以使用能夠溶解上述黏合劑樹脂的習知的有機溶劑。作為有機溶劑，例如可列舉為二氫萜品醇乙酸酯、乙酸異冰片酯、丙酸異冰片酯、丁酸異冰片酯以及異丁酸異冰片酯、乙二醇單丁醚乙酸酯、二丙二醇甲基醚乙酸酯等乙酸酯系溶劑、萜品醇、二氫萜品醇等萜系溶劑、十三烷、壬烷、環己烷等烴系溶劑等。此外，有機溶劑可以使用一種，亦可以使用兩種以上。 The organic solvent is not particularly limited, and known organic solvents capable of dissolving the above-mentioned binder resin can be used. Examples of organic solvents include dihydroterpineol acetate, isobornyl acetate, isobornyl propionate, isobornyl butyrate and isobornyl isobutyrate, and ethylene glycol monobutyl ether acetate. , acetate-based solvents such as dipropylene glycol methyl ether acetate, terpine-based solvents such as terpineol and dihydroterpineol, and hydrocarbon-based solvents such as tridecane, nonane, and cyclohexane. In addition, one kind of organic solvent may be used, and two or more kinds may be used.
以導電性粉末為100質量份計，有機溶劑的含量理想為40質量份以上100質量份以下，更理想為65質量份以上95質量份以下。 The content of the organic solvent is preferably not less than 40 parts by mass and not more than 100 parts by mass, more preferably not less than 65 parts by mass and not more than 95 parts by mass, based on 100 parts by mass of the conductive powder.
有機溶劑的含量相對於導電性漿料的總量理想為20質量%以上60質量%以下，更理想為35質量%以上55質量%以下。在有機溶劑的含量為上述範圍內的情況下，導電性以及分散性優異。 The content of the organic solvent is preferably from 20% by mass to 60% by mass with respect to the total amount of the conductive paste, more preferably from 35% by mass to 55% by mass. When content of an organic solvent exists in the said range, electroconductivity and dispersibility are excellent.
(分散劑) (Dispersant)
本實施型態的導電性漿料含有分散劑。分散劑含有通式(1)所示的胺基酸系分散劑(胺基酸系表面活性劑)以及通式(2)所示的胺系分散劑。此外，分散劑可以含有除了通式(1)所示的胺基酸系分散劑以及通式(2)所示的胺系分散劑以外的分散劑。 The conductive paste of this embodiment contains a dispersant. The dispersant contains an amino acid-based dispersant (amino acid-based surfactant) represented by the general formula (1) and an amine-based dispersant represented by the general formula (2). In addition, the dispersant may contain dispersants other than the amino acid-based dispersant represented by the general formula (1) and the amine-based dispersant represented by the general formula (2).
本發明的發明人針對在導電性漿料中使用的分散劑對各種 分散劑進行研究的結果係，發現：藉由以特定的配比將上述兩種分散劑組合，由此使得導電性漿料的隨時間的黏度變化較小，黏度穩定性非常優異，並且，導電性粉末的分散性優異，在塗布後的乾燥膜中具有較高的表面平滑性及較高的乾燥膜密度。 As a result of studying various dispersants for dispersants used in conductive paste, the inventors of the present invention found that by combining the above two dispersants in a specific ratio, the conductive paste can be made The viscosity change with time is small, the viscosity stability is very excellent, and the dispersibility of the conductive powder is excellent, and the dry film after coating has high surface smoothness and high dry film density.
另外，本發明的發明人發現，藉由以特定的配比將上述兩種分散劑組合並且將上述兩種分散劑的合計含量設為特定的量，由此能夠進一步提高導電性漿料的黏度穩定性以及分散性，並且在形成積層體時的黏附性亦很優異。 In addition, the inventors of the present invention found that the viscosity of the conductive paste can be further increased by combining the two dispersants in a specific ratio and setting the total content of the two dispersants to a specific amount. Stability and dispersibility, and excellent adhesion when forming a laminate.
其理由的詳情雖然不明，但可以認為係由分散劑的分子中存在的胺基及羧基嚮導電性粉末的金屬原子發生配位元等作用而帶來的效果。以下，對本實施型態中使用的分散劑進行說明。 Although the details of the reason are not clear, it is considered that the effect is brought about by the action of the amine group and carboxyl group present in the molecule of the dispersant to form a ligand on the metal atom of the conductive powder. Hereinafter, the dispersant used in this embodiment will be described.
本實施型態中使用的胺基酸系分散劑如下述通式(1)所示，具有N-醯基胺基酸骨架，並且具有碳原子數為10以上20以下的鏈狀烴基。 The amino acid-based dispersant used in this embodiment has an N-acylamino acid skeleton and a chain hydrocarbon group having 10 to 20 carbon atoms, as represented by the following general formula (1).
(其中，在式(1)中，R1表示碳原子數為10~20的鏈狀烴基。) (wherein, in formula (1), R 1 represents a chain hydrocarbon group with 10 to 20 carbon atoms.)
上述式(1)中，R1表示碳原子數為10以上20以下的鏈狀烴基。R1的碳原子數理想為15以上20以下。另外，鏈狀烴基可以係直鏈狀烴基，亦可以係支鏈狀烴基。另外，鏈狀烴基可以係烷基、烯基或炔基。R1理想為直鏈狀烴基，更理想為直鏈狀烯基而具有雙鍵。 In the above formula (1), R 1 represents a chain hydrocarbon group having 10 to 20 carbon atoms. The number of carbon atoms of R 1 is desirably not less than 15 and not more than 20. In addition, the chain hydrocarbon group may be a straight chain hydrocarbon group or a branched chain hydrocarbon group. In addition, the chain hydrocarbon group may be an alkyl group, an alkenyl group or an alkynyl group. R 1 is ideally a straight-chain hydrocarbon group, more preferably a straight-chain alkenyl group having a double bond.
上述式(1)所示的胺基酸系分散劑例如可以選擇使用市售的產品中滿足上述特性的胺基酸系分散劑。另外，亦可以使用以往習知的製造方法來製造上述胺基酸系分散劑以滿足上述特性。 As the amino acid-based dispersant represented by the above formula (1), for example, commercially available amino acid-based dispersants satisfying the above characteristics can be selected and used. In addition, the above-mentioned amino acid-based dispersant can also be produced using conventionally known production methods to satisfy the above-mentioned characteristics.
上述胺系分散劑如下述通式(2)所示，為叔胺或仲胺，具有胺基與一個或兩個氧化烯基鍵合而成的結構。 The above-mentioned amine-based dispersant is represented by the following general formula (2), is a tertiary amine or a secondary amine, and has a structure in which an amine group is bonded to one or two oxyalkylene groups.
(其中，在式(2)中，R2表示碳原子數為8~16的烷基、烯基或炔基，R3表示氧化乙烯基、氧化丙烯基或亞甲基，R4表示氧化乙烯基或氧化丙烯基，R3及R4可以相同或者亦可以不同。另外，式(2)中的N原子不與R3以及R4中的O原子直接鍵合，Y為0~2的數值，Z為1~2的數值。) (wherein, in formula (2), R 2 represents an alkyl, alkenyl or alkynyl group with 8 to 16 carbon atoms, R 3 represents an oxyethylene group, an oxypropylene group or a methylene group, and R 4 represents an oxyethylene group R3 and R4 can be the same or different. In addition, the N atom in formula (2) is not directly bonded to the O atom in R3 and R4 , and Y is a value of 0 to 2 , Z is a value from 1 to 2.)
在上述式(2)中，R2表示碳原子數為8~16的烷基、烯基或炔基。在R2的碳原子數為上述範圍內的情況下，導電性漿料中的粉末 具有充分的分散性，相對於溶劑的溶解度優異。此外，R2理想為直鏈狀烴基。 In the above formula (2), R 2 represents an alkyl, alkenyl or alkynyl group having 8 to 16 carbon atoms. When the number of carbon atoms of R 2 is within the above range, the powder in the conductive paste has sufficient dispersibility, and the solubility to the solvent is excellent. In addition, R 2 is ideally a linear hydrocarbon group.
在上述式(2)中，R3表示氧化乙烯基、氧化丙烯基或亚甲基，R4表示氧化乙烯基或氧化丙烯基，R3及R4可以相同或者亦可以不同。另外，式(2)中的N原子不與R3以及R4中的O原子直接鍵合，Y為0以上2以下的數值，Z為1以上2以下的數值。 In the above formula (2), R 3 represents an oxyethylene group, an oxypropylene group or a methylene group, R 4 represents an oxyethylene group or an oxypropylene group, and R 3 and R 4 may be the same or different. In addition, the N atom in the formula (2) is not directly bonded to the O atom in R3 and R4 , Y is a value of 0 to 2, and Z is a value of 1 to 2.
例如，在上述式(2)中，R3係由-AO-表示的氧化烯基，當Y為1~2的情況下，末端部的氧化烯基中的O原子及與(R3)Y相鄰的H原子鍵合。另外，當R3為亞甲基的情況下，(R3)Y由-(CH2)Y-表示，當Y為1~2的情況下，與相鄰的H元素鍵合而形成甲基(-CH3)或乙基(-CH2-CH3)。此外，當R4係由-AO-表示的氧化烯基的情況下，末端部的氧化烯基中的O原子及與(R4)Z相鄰的H原子鍵合。 For example, in the above formula (2), R 3 is an oxyalkylene group represented by -AO-, and when Y is 1 to 2, the O atom in the oxyalkylene group at the terminal and (R 3 ) Y Adjacent H atoms are bonded. In addition, when R 3 is a methylene group, (R 3 ) Y is represented by -(CH 2 ) Y -, and when Y is 1 to 2, it bonds with an adjacent H element to form a methyl group (-CH 3 ) or ethyl (-CH 2 -CH 3 ). Also, when R 4 is an oxyalkylene group represented by -AO-, the O atom in the terminal oxyalkylene group is bonded to the H atom adjacent to (R 4 ) Z.
在上述式(2)中，當Y為0的情況下，上述胺系分散劑為具有-R2、一個氫基及-(R4)zH的仲胺。例如，當Y為0、Z為2的情況下，上述胺系分散劑係由碳原子為8~16的烷基、烯基或炔基、一個氫基、及-(R4)2H所構成的仲胺，前述-(R4)2H即為二氧化乙烯基或二氧化丙烯基中的任一個與H元素鍵合而成的-(AO)2H。 In the above formula (2), when Y is 0, the above-mentioned amine-based dispersant is a secondary amine having -R 2 , one hydrogen group, and -(R 4 ) z H. For example, when Y is 0 and Z is 2, the above-mentioned amine-based dispersant is composed of an alkyl, alkenyl or alkynyl group with 8 to 16 carbon atoms, a hydrogen group, and -(R 4 ) 2 H The secondary amine constituted, the aforementioned -(R 4 ) 2 H is -(AO) 2 H in which either an ethylene dioxide group or a propylene dioxide group is bonded to an H element.
在上述式(2)中，當Y為1的情況下，上述胺系分散劑為具有-R2、-R3H及-(R4)zH的叔胺。而且，當Y為2的情況下，上述胺系分散劑為具有-R2、-(R3)2H、及-(R4)zH的叔胺，前述-(R3)2H即為二氧化乙烯基、二氧化丙烯基或亞乙基中的任一個與H元素鍵合而成的-(AO)2H或-C2H5。 In the above-mentioned formula (2), when Y is 1, the above-mentioned amine-based dispersant is a tertiary amine having -R 2 , -R 3 H and -(R 4 ) z H. Moreover, when Y is 2, the above-mentioned amine-based dispersant is a tertiary amine having -R 2 , -(R 3 ) 2 H, and -(R 4 ) z H, and the above-mentioned -(R 3 ) 2 H is -(AO) 2 H or -C 2 H 5 in which any one of ethylene dioxide, propylene oxide or ethylene is bonded to H element.
上述式(2)所示的胺系分散劑例如可以選擇使用市售的產品中滿足上述特性的胺系分散劑。另外，亦可以使用以往習知的製造方法來製造上述胺系分散劑以滿足上述特性。 As the amine-based dispersant represented by the above-mentioned formula (2), for example, commercially available amine-based dispersants satisfying the above-mentioned characteristics can be selected and used. In addition, the above-mentioned amine-based dispersant can also be produced using conventionally known production methods to satisfy the above-mentioned characteristics.
以質量比計，導電性漿料中含有的上述胺基酸系分散劑與上述胺系分散劑的配比(胺基酸系分散劑/胺系分散劑)為1/4以上1/2以下的範圍。尤其係當上述胺基酸系分散劑與上述胺系分散劑的配比為1/4以上2/5以下的情況下，具有非常高的導電性漿料黏度穩定性。 In terms of mass ratio, the ratio of the above-mentioned amino acid-based dispersant to the above-mentioned amine-based dispersant contained in the conductive paste (amino acid-based dispersant/amine-based dispersant) is not less than 1/4 and not more than 1/2 range. Especially when the ratio of the above-mentioned amino acid-based dispersant to the above-mentioned amine-based dispersant is 1/4 to 2/5, the conductive paste has very high viscosity stability.
當胺基酸系分散劑與胺系分散劑的配比的下限為1/4以上的情況下，能夠進一步提高導電性漿料黏度的隨時間變化的改善效果，並且能夠提高導電性粉末的分散性，且具有較高的乾燥膜表面平滑性及較高的乾燥膜密度。另外，當胺基酸系分散劑與胺系分散劑的配比的上限為1/2以下的情況下，胺系分散劑變得相對較多，由此能夠極大地減小導電性漿料黏度的隨時間的變化。 When the lower limit of the ratio of the amino acid-based dispersant to the amine-based dispersant is 1/4 or more, the effect of improving the viscosity of the conductive paste over time can be further improved, and the dispersion of the conductive powder can be improved. properties, and has a higher dry film surface smoothness and a higher dry film density. In addition, when the upper limit of the ratio of the amino acid-based dispersant to the amine-based dispersant is 1/2 or less, the amine-based dispersant becomes relatively large, thereby greatly reducing the viscosity of the conductive paste. changes over time.
相對於導電性漿料的總量，上述式(1)所示的胺基酸系分散劑及上述式(2)所示的胺系分散劑的合計含量為0.7質量%以上1.2質量%以下。當上述胺基酸系分散劑及上述胺系分散劑的合計含量在上述範圍內的情況下，能夠得到導電性漿料的分散性提高、具有較高的乾燥膜密度且表面的平滑性優異的乾燥膜，並且能夠抑制由分散劑的殘留而導致的片材侵蝕、生片的剝離不良。 The total content of the amino acid-based dispersant represented by the formula (1) and the amine-based dispersant represented by the formula (2) is 0.7% by mass or more and 1.2% by mass or less with respect to the total amount of the conductive paste. When the total content of the above-mentioned amino acid-based dispersant and the above-mentioned amine-based dispersant is within the above-mentioned range, the dispersibility of the conductive paste is improved, the dry film density is high, and the smoothness of the surface is excellent. The film can be dried, and the sheet erosion and green sheet peeling failure caused by the residue of the dispersant can be suppressed.
當上述胺基酸系分散劑及上述胺系分散劑的合計含量的下限為0.7質量%以上的情況下，在以上述配比含有上述胺基酸系分散劑及上述胺系分散劑的導電性漿料中，能夠進一步提高分散性並具有較高的乾 燥膜平滑性及乾燥膜密度，並且能夠進一步減小導電性漿料黏度的隨時間的變化。另外，當上述胺基酸系分散劑及上述胺系分散劑的合計含量的上限為1.2質量%以下的情況下，進一步降低分散劑向乾燥膜表面的殘留量，抑制在積層、壓接時阻礙到乾燥膜表面與生片表面的黏附性而產生剝離的情況。 When the lower limit of the total content of the amino acid-based dispersant and the above-mentioned amine-based dispersant is 0.7% by mass or more, the conductive In the slurry, the dispersibility can be further improved, the dry film smoothness and the dry film density can be higher, and the change with time of the viscosity of the conductive paste can be further reduced. In addition, when the upper limit of the total content of the above-mentioned amino acid-based dispersant and the above-mentioned amine-based dispersant is 1.2% by mass or less, the residual amount of the dispersant on the surface of the dry film is further reduced, and the hindrance during lamination and pressure bonding is suppressed. The peeling occurs due to the adhesion between the surface of the dry film and the surface of the green sheet.
此外，導電性漿料可以在不阻礙本發明的效果的範圍內含有除上述胺基酸系分散劑以及胺系分散劑以外的分散劑。作為除上述以外的分散劑，例如可以含有包括高級脂肪酸、高分子表面活性劑等的酸系分散劑、酸系分散劑以外的陽離子系分散劑、非離子系分散劑、兩性表面活性劑以及高分子系分散劑等等。另外，此等分散劑可以使用一種或兩種以上組合使用。 In addition, the conductive paste may contain dispersants other than the above-mentioned amino acid-based dispersant and amine-based dispersant within the range that does not inhibit the effect of the present invention. As dispersants other than the above, for example, acid-based dispersants including higher fatty acids, polymer surfactants, cationic dispersants other than acid-based dispersants, nonionic dispersants, amphoteric surfactants, and high Molecular dispersant and so on. In addition, these dispersants may be used alone or in combination of two or more.
(導電性漿料) (conductive paste)
可以藉由準備上述各成分並利用混合機進行攪拌、混煉來製造本實施型態的導電性漿料。此時，若在導電性粉末表面預先塗布分散劑，則導電性粉末不會凝集，可充分地分散，其表面遍佈有分散劑，易於得到均勻的導電性漿料。另外，亦可以係，將黏合劑樹脂溶解於載體用的有機溶劑中來製備有機載體，並向漿料用的有機溶劑中添加導電性粉末、陶瓷粉末、有機載體以及分散劑，藉由混合機進行攪拌、混煉，從而製備導電性漿料。 The conductive paste of this embodiment can be manufactured by preparing each said component and stirring and kneading with a mixer. At this time, if the dispersant is pre-coated on the surface of the conductive powder, the conductive powder can be fully dispersed without agglomeration, and the dispersant is spread all over the surface, making it easy to obtain a uniform conductive paste. In addition, it is also possible to dissolve the binder resin in the organic solvent for the carrier to prepare the organic vehicle, and add conductive powder, ceramic powder, organic vehicle and dispersant to the organic solvent for the slurry, and mix it with a mixer. Stirring and kneading are performed to prepare a conductive paste.
另外，在有機溶劑中，作為載體用的有機溶劑，為了提高有機載體的親和性，理想使用與調整導電性漿料的黏度的漿料用的有機溶劑相同的有機溶劑。以導電性粉末為100質量份計，載體用的有機溶劑的 含量例如為5質量份以上80質量份以下。另外，相對於導電性漿料的總量，載體用的有機溶劑的含量理想為10質量%以上40質量%以下。 In addition, among the organic solvents, as the organic solvent for the carrier, it is desirable to use the same organic solvent as the organic solvent for the paste for adjusting the viscosity of the conductive paste in order to improve the affinity of the organic carrier. The content of the organic solvent for the carrier is, for example, not less than 5 parts by mass and not more than 80 parts by mass based on 100 parts by mass of the conductive powder. Moreover, content of the organic solvent for carriers is desirably 10 mass % or more and 40 mass % or less with respect to the total amount of electroconductive paste.
以從導電性漿料的製造起經過24小時後的黏度作為基準(0%)的情況下，從該基準日起靜置28天後的導電性漿料的黏度理想為±10%以內。此外，上述導電性漿料的黏度例如可以藉由實施例中記載的方法(使用Brookfield公司製造的B型黏度計在10rpm(剪切速率=4sec-1)的條件進行測定的方法)等來進行測定。 When the viscosity after 24 hours from the production of the conductive paste is used as a reference (0%), the viscosity of the conductive paste after standing still for 28 days from the reference date is preferably within ±10%. In addition, the viscosity of the above-mentioned conductive paste can be measured by, for example, the method described in the Examples (method of measuring at 10 rpm (shear rate=4sec −1 ) using a B-type viscometer manufactured by Brookfield Co., Ltd.) and the like. Determination.
另外，可以藉由表面粗糙度來評價印刷導電性漿料而形成的乾燥膜的表面平滑性。此外，例如可以藉由在實施例中記載的方法(使用基恩士公司製造的VK-X120並基於ISO 25178的標準對算術平均高度Sa進行的方法)等來測定上述導電性漿料的表面粗糙度。在以算術平均高度Sa來進行評價的情況下，乾燥膜的表面平滑性的值理想為0.17μm以下。 In addition, the surface smoothness of the dried film formed by printing the conductive paste can be evaluated by the surface roughness. In addition, the surface roughness of the above-mentioned conductive paste can be measured by, for example, the method described in the examples (the method of performing the arithmetic mean height Sa based on the standard of ISO 25178 using VK-X120 manufactured by KEYENCE Corporation). Spend. When evaluated by the arithmetic mean height Sa, the value of the surface smoothness of the dry film is desirably 0.17 μm or less.
導電性漿料能夠適宜地使用在積層陶瓷電容器等電子零件中。積層陶瓷電容器具有使用生片而形成的電介質層以及使用導電性漿料而形成的內部電極層。 The conductive paste can be suitably used for electronic components such as multilayer ceramic capacitors. A laminated ceramic capacitor has a dielectric layer formed using a green sheet and an internal electrode layer formed using a conductive paste.
對於積層陶瓷電容器而言，生片中含有的電介質陶瓷粉末及導電性漿料中含有的陶瓷粉末理想為同一組成的粉末。使用本實施型態的導電性漿料製造的積層陶瓷電容器，即使在生片的厚度例如為3μm以下的情況下，亦能夠抑制片材侵蝕、生片的剝離不良。 For a multilayer ceramic capacitor, it is desirable that the dielectric ceramic powder contained in the green sheet and the ceramic powder contained in the conductive paste have the same composition. The laminated ceramic capacitor manufactured using the conductive paste of this embodiment can suppress sheet erosion and green sheet peeling defects even when the thickness of the green sheet is, for example, 3 μm or less.
[電子零件] [electronic parts]
以下，參照圖式對本發明的電子零件等的實施型態進行說明。在圖式 中，有時會適當地以示意性的方式來進行表示、變更比例尺來進行表示。另外，適當地參照圖1A等所示的XYZ正交坐標系來對零件的位置、方向等進行說明。在該XYZ正交坐標系中，X方向以及Y方向為水準方向，Z方向為鉛垂方向(上下方向)。 Hereinafter, embodiments of electronic components and the like according to the present invention will be described with reference to the drawings. In the drawings, it may be shown in a schematic form or changed in scale as appropriate. In addition, the position, direction, etc. of a component are demonstrated with reference to the XYZ rectangular coordinate system shown to FIG. 1A etc. suitably. In this XYZ rectangular coordinate system, the X direction and the Y direction are horizontal directions, and the Z direction is a vertical direction (vertical direction).
圖1A以及圖1B係表示作為實施型態所關於的電子零件的一個例子的、積層陶瓷電容器1的圖。積層陶瓷電容器1具有電介質層12以及內部電極層11交替地積層而成的陶瓷積層體10及外部電極20。 1A and 1B are diagrams showing a multilayer ceramic capacitor 1 as an example of an electronic component related to the embodiment. Multilayer ceramic capacitor 1 has
以下，對使用上述導電性漿料的積層陶瓷電容器的製造方法進行說明。首先，在生片上印刷導電性漿料並進行乾燥而形成乾燥膜。藉由對在上表面具有該乾燥膜的多個生片進行積層壓接而得到積層體之後，對該積層體進行燒製而使其一體化，由此製備內部電極層11及電介質層12交替地積層而成的陶瓷積層體10。之後，藉由在陶瓷積層體10的兩端部形成一對外部電極20而製造積層陶瓷電容器1。以下，進行更詳細的說明。 Hereinafter, the manufacturing method of the laminated ceramic capacitor using the said electroconductive paste is demonstrated. First, a conductive paste is printed and dried on a green sheet to form a dry film. After laminating and pressure-bonding a plurality of green sheets having the dry film on the upper surface to obtain a laminate, the laminate is fired to integrate it, thereby producing alternate internal electrode layers 11 and dielectric layers 12 . The
首先，準備作為使用有電介質材料的未燒製的陶瓷片的生片。作為該生片，例如，可列舉為將在鈦酸鋇等規定的陶瓷原料粉末中加入聚乙烯醇縮丁醛等有機黏合劑及萜品醇等溶劑而得到的電介質層用漿料在PET薄膜等支承薄膜上塗布成片狀並進行乾燥去除溶劑而形成的生片等。此外，對生片的厚度並無特別限定，但從積層陶瓷電容器的小型化的要求的觀點出發，理想為0.05μm以上3μm以下。 First, a green sheet that is an unfired ceramic sheet using a dielectric material is prepared. As the green sheet, for example, slurry for a dielectric layer obtained by adding an organic binder such as polyvinyl butyral and a solvent such as terpineol to a predetermined ceramic raw material powder such as barium titanate is exemplified. A green sheet or the like formed by coating a sheet on a supporting film and drying to remove the solvent. In addition, the thickness of the green sheet is not particularly limited, but is preferably 0.05 μm or more and 3 μm or less in view of the demand for miniaturization of multilayer ceramic capacitors.
接下來，準備多個藉由在該生片的一個面上藉由絲網印刷法等習知的方法印刷(塗布)上述導電性漿料並進行乾燥而形成有乾燥膜 的片材。此外，從內部電極層11的薄層化的要求的觀點出發，印刷後的導電性漿料的厚度理想為使乾燥後的乾燥膜的厚度為1μm以下的厚度。 Next, a plurality of sheets having dried films formed by printing (coating) the above-mentioned conductive paste on one surface of the green sheet by a known method such as screen printing and drying are prepared. In addition, from the viewpoint of the requirement for thinning the
接下來，從支承薄膜上將生片剝離，並且以生片與形成於該生片的一個面上的乾燥膜交替地配置的方式進行積層之後，藉由加熱、加壓處理而得到積層體。此外，亦可設為在積層體的兩面進一步配置未塗布導電性漿料的保護用的生片的構成。 Next, the green sheet is peeled off from the support film, laminated so that the green sheet and the dry film formed on one surface of the green sheet are alternately arranged, and then heated and pressurized to obtain a laminated body. Moreover, the structure which arrange|positions the protective green sheet which did not apply|coat the electroconductive paste further on both surfaces of a laminated body can also be made into it.
接下來，將積層體切斷為規定尺寸而形成生晶片之後，對該生晶片實施脫黏合劑處理，並在還原氣氛下進行燒製，由此製造陶瓷積層體10。此外，脫黏合劑處理中的氣氛理想為大氣或N2氣體氣氛。進行脫黏合劑處理時的溫度例如為200℃以上400℃以下。另外，進行脫黏合劑處理時的上述溫度的保持時間理想為0.5小時以上24小時以下。另外，為了抑制在內部電極層中使用的金屬的氧化而在還原氣氛下進行燒製，另外，進行積層體的燒製時的溫度例如為1000℃以上1350℃以下，進行燒製時的溫度的保持時間例如為0.5小時以上8小時以下。 Next, after the laminate is cut into a predetermined size to form a green wafer, the green wafer is subjected to a binder removal process and fired in a reducing atmosphere to manufacture the
藉由進行生晶片的燒製，將生片中的有機黏合劑完全去除，並且陶瓷原料粉末得到燒製而形成陶瓷製的電介質層12。另外，去除乾燥膜中的有機載體，並且使鎳粉末或以鎳作為主要成分的合金粉末燒結或熔融而一體化，從而形成內部電極層11，進而形成電介體層12與內部電極層11多層交替地積層而成的積層陶瓷燒製體。此外，從將氧帶入電介質層的內部而提高可靠性、且抑制內部電極的再氧化的觀點出發，可以對燒製後的積層陶瓷燒製體實施退火處理。 By firing the green wafer, the organic binder in the green sheet is completely removed, and the ceramic raw material powder is fired to form the
接著，藉由對所製備的積層陶瓷燒製體設置一對外部電極 20，由此製造積層陶瓷電容器1。例如，外部電極20具備外部電極層21以及電鍍層22。外部電極層21與內部電極層11電連接。此外，作為外部電極20的材料，例如可以理想地使用銅、鎳或上述元素之合金。此外，電子零件不限於積層陶瓷電容器，亦可以係除積層陶瓷電容器以外的電子零件。 Next, the laminated ceramic capacitor 1 is manufactured by providing a pair of
以下，基於實施例及對比例對本發明進行詳細說明，但本發明並不受實施例的任何限定。 Hereinafter, the present invention will be described in detail based on examples and comparative examples, but the present invention is not limited by the examples.
〔使用材料〕 〔Materials used〕
(導電性粉末) (conductive powder)
作為導電性粉末，使用Ni粉末(SEM平均粒徑為0.3μm)。 As the conductive powder, Ni powder (SEM average particle size: 0.3 μm) was used.
(陶瓷粉末) (ceramic powder)
作為陶瓷粉末，使用鈦酸鋇(BaTiO3；SEM平均粒徑為0.06μm)。 As the ceramic powder, barium titanate (BaTiO 3 ; SEM average particle size: 0.06 μm) was used.
(黏合劑樹脂) (Binder resin)
作為黏合劑樹脂，使用乙基纖維素樹脂以及聚乙烯醇縮丁醛樹脂(PVB樹脂)。此外，黏合劑樹脂使用作為溶解於萜品醇中的載體而準備的黏合劑樹脂。 As the binder resin, ethyl cellulose resin and polyvinyl butyral resin (PVB resin) are used. In addition, as the binder resin, what was prepared as a carrier dissolved in terpineol was used.
(分散劑) (Dispersant)
(1)作為胺基酸系分散劑，使用在上述通式(1)中R1=C17H33(直鏈狀烴基)所示的分散劑。 (1) As the amino acid-based dispersant, a dispersant represented by R 1 =C 17 H 33 (linear hydrocarbon group) in the above general formula (1) is used.
(2)作為胺系分散劑，使用在上述通式(2)中R2=C12H25、 R3=C2H4O、R4=C2H4O、Y=1、Z=1所示的分散劑。 (2) As an amine-based dispersant, R 2 =C 12 H 25 , R 3 =C 2 H 4 O, R 4 =C 2 H 4 O, Y=1, Z= The dispersant shown in 1.
(有機溶劑) (Organic solvents)
作為有機溶劑，使用萜品醇。 As the organic solvent, terpineol was used.
〔實施例1〕 [Example 1]
以作為總量為100質量%的方式配合46質量%的Ni粉末、11.5質量%的陶瓷粉末、合計為3.2質量%的載體中的黏合劑樹脂(由乙基纖維素樹脂及聚乙烯醇縮丁醛樹脂構成)、0.2質量%的胺基酸系分散劑、0.6質量%的胺系分散劑以及作為餘量的萜品醇(有機溶劑)，並將此等材料混合來製備導電性漿料。以下述的方法對所製備的導電性漿料的黏度穩定性、分散性(乾燥膜密度、乾燥膜的表面粗糙度)、黏附性進行評價。將評價結果示於表1。 46% by mass of Ni powder, 11.5% by mass of ceramic powder, and a total of 3.2% by mass of binder resin (composed of ethyl cellulose resin and polyvinyl butyral) in the carrier were mixed so that the total amount was 100% by mass. aldehyde resin), 0.2% by mass of an amino acid-based dispersant, 0.6% by mass of an amine-based dispersant, and terpineol (organic solvent) as the balance, and these materials were mixed to prepare a conductive paste. The viscosity stability, dispersibility (dry film density, surface roughness of dry film) and adhesiveness of the prepared conductive paste were evaluated by the following method. Table 1 shows the evaluation results.
〔評價方法〕 〔Evaluation method〕
(黏度穩定性：導電性漿料的黏度的變化量) (Viscosity stability: change in viscosity of conductive paste)
以從導電性漿料的製造起經過24小時後作為基準時刻，藉由下述方法分別對該基準時刻、在室溫(25℃)下從基準時刻起靜置7天、14天、28天後的樣品的黏度進行測定。接著，求出以從製造起經過24小時後(基準時刻)的黏度作為基準(0%)的情況下的、以百分率(%)表示各靜置後的樣品的黏度的變化量的值(〔(靜置後的黏度-從製造起經過24小時後的黏度)/從製造起經過24小時後的黏度〕×100)，並作為黏度的變化量。使用Brookfield公司製造的B型黏度計在10rpm(剪切速率=4sec-1)的條件下測定導電性漿料的黏度。此外，導電性漿料的黏度的變化量越小則越理想。將靜置28天後的導電性漿料的黏度的變化量為10%以下的情 況記作「A」，將超過10%的情況記作「B」，來評價導電性漿料的黏度穩定性。 Taking 24 hours after the production of the conductive paste as the reference time, the reference time was left to stand at room temperature (25°C) for 7 days, 14 days, and 28 days from the reference time by the following method. The viscosity of the samples after that was measured. Next, the value ([ (viscosity after standing-viscosity after 24 hours from production)/viscosity after 24 hours from production]×100), and it was used as the change amount of viscosity. The viscosity of the conductive paste was measured under the condition of 10 rpm (shear rate=4sec −1 ) using a B-type viscometer manufactured by Brookfield. Moreover, it is more preferable that the change amount of the viscosity of an electroconductive paste is small. The change in viscosity of the conductive paste after standing for 28 days was marked as "A" when it was less than 10%, and "B" when it exceeded 10% to evaluate the viscosity stability of the conductive paste .
(分散性：乾燥膜的表面粗糙度、乾燥膜密度) (Dispersibility: surface roughness of dry film, dry film density)
<表面粗糙度> <Surface Roughness>
在2.54cm(1英寸)見方的耐熱強化玻璃上絲網印刷所製備的導電性漿料，在大氣中以120℃乾燥1小時，由此製備20mm見方、膜厚為1~3μm的乾燥膜。在導電性漿料的分散性良好的情況下，乾燥膜的表面成為平滑的膜。在分散性較差的情況下，在導電性漿料內產生凝集，使乾燥膜的表面粗糙，表面平滑性降低。在此，使用鐳射顯微鏡(基恩士公司製造的VK-X120)並基於ISO 25178的標準測定所製備的乾燥膜的表面粗糙度Sa(算術平均高度)、Sz(最大高度)。表面粗糙度Sa(算術平均高度)、Sz(最大高度)的值越小，則表示乾燥膜的表面越平滑。 The prepared conductive paste was screen-printed on a 2.54 cm (1 inch) square of heat-resistant tempered glass, and dried at 120°C in the air for 1 hour to prepare a dry film of 20 mm square and a film thickness of 1 to 3 μm. When the dispersibility of an electroconductive paste is favorable, the surface of a dry film becomes a smooth film. When the dispersibility is poor, aggregation occurs in the conductive paste, the surface of the dried film is roughened, and the surface smoothness is lowered. Here, the surface roughness Sa (arithmetic mean height) and Sz (maximum height) of the prepared dry film were measured using a laser microscope (Keyence VK-X120) in accordance with ISO 25178. The smaller the value of the surface roughness Sa (arithmetic mean height) and Sz (maximum height), the smoother the surface of the dry film is.
(乾燥膜密度(DFD：Dry Film Density)) (Dry Film Density (DFD: Dry Film Density))
將製備的導電性漿料載置在PET薄膜上，利用寬度為50mm、間隙為125μm的塗布器延伸至長度約為100mm。在以120℃對得到的PET薄膜乾燥40分鐘而形成乾燥體之後，將該乾燥體切割為4個2.54cm(1英寸)的見方，在將PET薄膜剝離的基礎上，對4個乾燥膜的厚度、質量分別進行測定，並計算出乾燥膜密度(平均值)。若導電性漿料的分散性較低而使導電性粉末產生凝集，則有時會使乾燥膜密度降低，從而使電特性等較差。乾燥膜密度越高，則表示分散性越良好。 The prepared conductive paste was placed on a PET film, and spread to a length of about 100 mm by an applicator having a width of 50 mm and a gap of 125 μm. After drying the obtained PET film at 120° C. for 40 minutes to form a dried body, the dried body was cut into four 2.54 cm (1 inch) squares. Thickness and mass were measured respectively, and the dry film density (average value) was calculated. When the dispersibility of the electroconductive paste is low and the electroconductive powder aggregates, the dry film density may fall, and electrical characteristics etc. may be inferior. The higher the dry film density, the better the dispersibility.
<分散性的評價> <Evaluation of dispersion>
將上述乾燥膜的表面粗糙度Sa(算數平均高度)為0.17μm以下、且 乾燥膜密度DFD為5.50g/cm3以上的情況記作「A」，將滿足乾燥膜的表面粗糙度Sa(算數平均高度)大於0.17μm的情況以及乾燥膜密度DFD小於5.50g/cm3的情況中的任一者或者滿足雙方的情況記作「B」，來評價分散性。 The case where the surface roughness Sa (arithmetic average height) of the above-mentioned dry film is 0.17 μm or less and the dry film density DFD is 5.50 g/ cm The case where the average height) is greater than 0.17 μm and the case where the dry film density DFD is less than 5.50 g/cm 3 or the case where both are satisfied is recorded as "B" to evaluate the dispersibility.
(黏附性) (adhesive)
藉由絲網印刷法將所製備的導電性漿料印刷(塗布)在生片上並進行乾燥，製備多個在生片上形成有乾燥膜的片材。積層五層上述片材，以80℃、100kg/cm2的壓力進行3分鐘的熱壓接處理，從而形成積層體。在得到的積層體中，將乾燥膜表面(電極層表面)與在其上積層的生片底面之間的黏附性較弱而在一處以上的位置產生剝離的情況記作「×」，除此之外，將未產生剝離的情況記作「○」，來評價黏附性。 The prepared conductive paste was printed (coated) on a green sheet by a screen printing method and dried to prepare a plurality of sheets in which a dry film was formed on the green sheet. Five layers of the above sheets were laminated, and subjected to thermocompression bonding at 80° C. and a pressure of 100 kg/cm 2 for 3 minutes to form a laminate. In the obtained laminate, when the adhesiveness between the dry film surface (electrode layer surface) and the bottom surface of the green sheet laminated thereon was weak and peeling occurred at one or more places, it was marked as "×", except In addition, the case where peeling did not occur was marked as "(circle)", and adhesiveness was evaluated.
〔實施例2、3，對比例1、2〕 [embodiment 2,3, comparative example 1,2]
除了將胺基酸系分散劑及胺系分散劑的含量設為表1所示的量來變更分散劑的配比以外，以與實施例1相同的條件製備導電性漿料。藉由上述方法對所製備的導電性漿料的黏度的變化量、乾燥膜密度、乾燥膜的表面粗糙度以及黏附性進行評價。將評價結果示於表1。 An electroconductive paste was prepared on the same conditions as in Example 1 except that the content of the amino acid-based dispersant and the amine-based dispersant was changed to the amounts shown in Table 1 and the compounding ratio of the dispersant was changed. The amount of change in the viscosity of the prepared conductive paste, the dry film density, the surface roughness of the dry film, and the adhesiveness were evaluated by the above-mentioned method. Table 1 shows the evaluation results.
〔實施例4~6，對比例3、4〕 [embodiment 4～6, comparative example 3,4]
除了以保持分散劑的配比固定不變的方式將胺基酸系分散劑及胺系分散劑的含量設為表2所示的量來變更導電性漿料內的分散劑的總含量以外，以與實施例1相同的條件製備導電性漿料。藉由上述方法對所製備的導電性漿料的黏度的變化量、乾燥膜密度、乾燥膜的表面粗糙度以及黏附性進行評價。將評價結果示於表2。 In addition to changing the total content of the dispersant in the conductive paste by changing the content of the amino acid-based dispersant and the amine-based dispersant to the amounts shown in Table 2 while keeping the compounding ratio of the dispersant constant, A conductive paste was prepared under the same conditions as in Example 1. The amount of change in the viscosity of the prepared conductive paste, the dry film density, the surface roughness of the dry film, and the adhesiveness were evaluated by the above-mentioned method. Table 2 shows the evaluation results.
〔評價結果〕 〔Evaluation results〕
實施例的導電性漿料如表1以及表2所示，乾燥膜密度為5.5g/cm3以上，表面粗糙度Sa(算數平均高度)為0.17μm以下，在積層體上亦未觀察到剝離，顯示出良好的分散性、黏附性。另外，實施例的導電性漿料中，導電性漿料的黏度的隨時間的變化量在28天後為5.4%以下，非常低，可知具有非常良好的黏度穩定性。 As shown in Table 1 and Table 2, the conductive paste of the example has a dry film density of 5.5 g/cm 3 or more, a surface roughness Sa (arithmetic mean height) of 0.17 μm or less, and no peeling is observed on the laminate , showing good dispersion and adhesion. In addition, in the conductive paste of the example, the change over time of the viscosity of the conductive paste was very low at 5.4% or less after 28 days, and it was found that the viscosity stability was very good.
與其相對，胺基酸系分散劑與胺系分散劑的配比較低、且含有較多的胺系分散劑的對比例1的導電性漿料雖然黏度穩定性良好，惟乾燥膜密度為5.5g/cm3以下，表面粗糙度Sa超過0.17μm，與實施例的導電性漿料相比，分散性較低。另外，表面粗糙度Sz(最大高度)與實施例相比亦表現為稍大的值。另外，胺基酸系分散劑與胺系分散劑的配比較高、且含有較多的胺基酸系分散劑的對比例2的導電性漿料的28天後的導電性漿料黏度變化量為16.7%，變化10%以上。 In contrast, the conductive paste of Comparative Example 1, which has a low proportion of amino acid dispersant and amine dispersant and contains more amine dispersant, has good viscosity stability, but the dry film density is 5.5g /cm 3 or less, the surface roughness Sa exceeds 0.17 μm, and the dispersibility is lower than that of the conductive paste of the examples. In addition, the surface roughness Sz (maximum height) also exhibited a slightly larger value than the Examples. In addition, the amount of change in the viscosity of the conductive paste after 28 days of the conductive paste of Comparative Example 2, which has a high ratio of amino acid-based dispersant to amine-based dispersant and contains more amino acid-based dispersant It was 16.7%, a change of more than 10%.
另外，胺基酸系分散劑與胺系分散劑的合計含量小於0.7質量%的對比例3的導電性漿料與實施例的導電性漿料相比，分散性較低，黏度穩定性與實施例相比亦較低。另外，關於胺基酸系分散劑與胺系分散劑的合計含量超過1.2質量%的對比例4的導電性漿料，有時會在使用該對比例4的導電性漿料而製造的積層體中產生剝離，與實施例的導電性漿料相比，黏附性降低。 In addition, the conductive paste of Comparative Example 3 in which the total content of the amino acid-based dispersant and the amine-based dispersant is less than 0.7% by mass has lower dispersibility than the conductive paste of the example, and its viscosity stability is comparable to that of the embodiment. case is also lower. In addition, with regard to the conductive paste of Comparative Example 4 in which the total content of the amino acid-based dispersant and the amine-based dispersant exceeds 1.2% by mass, the laminate produced using the conductive paste of Comparative Example 4 may Peeling occurred in , and the adhesiveness decreased compared with the conductive paste of the Example.
此外，本發明的技術範圍不限於上述實施型態等中說明的態樣。有時會省略上述實施型態等中說明的要件中的一個以上。另外，可以適當地對上述實施型態等中說明的要件進行組合。另外，只要法律允 許，援引作為日本專利申請的日本特願2018-139501以及在本說明書中引用的全部的文獻的內容並作為本文記載的一部分。 In addition, the technical scope of the present invention is not limited to the aspects described in the above-mentioned embodiment and the like. In some cases, one or more of the requirements described in the above-mentioned embodiment and the like may be omitted. In addition, the requirements described in the above-mentioned embodiments and the like can be appropriately combined. In addition, as long as the law allows, the contents of Japanese Patent Application No. 2018-139501, which is a Japanese patent application, and all documents cited in this specification are cited as part of the description herein.
本實施型態所關於的導電性漿料由於分散性優異，塗布後的乾燥膜的平滑性以及乾燥膜密度優異，並且，隨時間的黏度穩定性非常優異，因此特別適宜用作作為行動電話、數位設備等電子設備的晶片零件(電子零件)的積層陶瓷電容器的內部電極用的原料。 The conductive paste related to this embodiment is particularly suitable for use as a mobile phone, a mobile phone, a Raw materials for internal electrodes of chip parts (electronic parts) of electronic equipment such as digital equipment, and multilayer ceramic capacitors.
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| CN105900196A (en) * | 2014-03-20 | 2016-08-24 | 积水化学工业株式会社 | Electroconductive paste |
| TW201805954A (en) * | 2016-02-29 | 2018-02-16 | 住友金屬鑛山股份有限公司 | Electrically conductive paste, electronic component, and laminated ceramic capacitor |
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| JP5038935B2 (en) * | 2008-02-25 | 2012-10-03 | 積水化学工業株式会社 | Conductive paste for multilayer ceramic capacitor internal electrode |
| JP6292014B2 (en) | 2014-05-12 | 2018-03-14 | 株式会社村田製作所 | Conductive paste and ceramic electronic components |
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| CN105900196A (en) * | 2014-03-20 | 2016-08-24 | 积水化学工业株式会社 | Electroconductive paste |
| TW201805954A (en) * | 2016-02-29 | 2018-02-16 | 住友金屬鑛山股份有限公司 | Electrically conductive paste, electronic component, and laminated ceramic capacitor |
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