JPH0319274B2 - - Google Patents
Info
- Publication number
- JPH0319274B2 JPH0319274B2 JP29289786A JP29289786A JPH0319274B2 JP H0319274 B2 JPH0319274 B2 JP H0319274B2 JP 29289786 A JP29289786 A JP 29289786A JP 29289786 A JP29289786 A JP 29289786A JP H0319274 B2 JPH0319274 B2 JP H0319274B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- titanium dioxide
- dioxide powder
- coating material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 40
- 239000000203 mixture Substances 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 23
- 239000004408 titanium dioxide Substances 0.000 claims description 20
- 229920001296 polysiloxane Polymers 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 239000006229 carbon black Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 239000000377 silicon dioxide Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000003618 dip coating Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000004447 silicone coating Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Description
〔発明の目的〕
（産業上の利用分野）
本発明はコーテイング材組成物，特にデイツプ
コート用シリコーン系コーテイング材に関するも
ので、ハイブリツドICの防湿絶縁コート等に利
用されるものである。
（従来の技術）
本発明に係る従来技術としては、特開昭59−
176347号の公報がある。
従来デイツプコート用材料は、デイツプ作業時
の様な剪断応力がかかつた状況では見かけの粘度
が低く、デイツプ作業後のような剪断応力がない
場合には見かけの粘度が高いという、所謂チクソ
トロピー性が高い方が良く、更にデイツプ作業時
の見かけ粘度は低ければ低い程作業性が良く、ま
た硬化後は強靭な皮膜強度を持つことが要望さ
れ、デイツプコート用シリコーン系コーテイング
材（ここでいうシリコーン系とはオルガノポリシ
ロキサンを主成分とする組成物をいう）は、チク
ソトロピー性や皮膜強度を高めるために微粒子シ
リカ粉末を添加していた。
（発明が解決しようとする問題点）
しかし前記チクソトロピー性や皮膜強度を高め
るために微粒子シリカ粉末を添加する場合に、一
般的に数十重量部を超えると凝集をおこしたり、
高粘度化したりするために、デイツプ作業が困難
になるので、より高いチクソトロピー性や皮膜強
度が得られないという問題点があつた。
本発明はデイツプコート用シリコーン系コーテ
イング材組成物に於いて、チクソトロピー性が高
く、かつ強靭な皮膜強度を持つコーテイング材組
成物を技術的課題とするものである。
〔発明の構成〕
（問題点を解決するための手段〕
前記技術的課題を解決するための手段は、オル
ガノポリシロキサンを主成分とする組成物に添加
剤として一次平均粒径が5.0〜100mμ，比表面積
が20m2／ｇ以上の二酸化チタン粉末、もしくは前
記二酸化チタン粉末とカーボンブラツクを加えた
コーテイング材組成物で、オルガノポリシロキサ
ンを主成分とする組成物100重量部に対し、前記
二酸化チタンを5.0〜150重量部添加するか、又は
オルガノポリシロキサン組成物100重量部に対し、
カーボンブラツクを0.5〜5.0重量部添加したコー
テイング材組成物である。
（作用）
前記技術的手段は次のように作用する。
すなわち、二酸化チタン粉末はチクソトロピー
性を高くする目的で添加するが、従来の微粒子シ
リカ粉末に比べ、同じチクソトロピー性を持たせ
た場合、見かけ粘度が低いという特徴がある。こ
の原因は結晶構造，粒子表面状態などによると推
定されるが、（実施例１と比較例１参照），二酸化
チタン粉末を添加剤として使用すれば微粒子シリ
カ粉末を使用した時よりも同一見かけ粘度で高い
チクソトロピー性を得ることができる。更に二酸
化チタン粉末は微粒子シリカ粉末に比べ添加量に
よる見かけ粘度増加が低いため（実施例１，比較
例１参照）、高充填が可能となり皮膜強度がアツ
プするものである。
この様な効果が得られる二酸化チタン粉末の一
次平均粒径は5.0〜100mμが好ましく、比表面積
が20m2／ｇ以上のものが良いものである（実施例
１，比較例２参照）。添加量はベースシリコーン
系組成物100重量部に対し5.0〜150重量部がチク
ソトロピー性や皮膜強度と見かけ粘度のバランス
がとれ作業性が良好であり、又二酸化チタン粉末
の表面処理は行つても、行わなくてもどちらでも
良い。
又見かけ粘度を低下させ、作業性を向上させる
とともに二酸化チタン粉末の高充填化を可能にさ
せるためにカーボンブラツクを添加することも有
効である（実施例１，２，３参照）。
添加量は任意に選択できるが、絶縁性を考慮す
るとベースシリコン組成物100重量部に対し0.5〜
5.0重量部が良い。
この様に添加剤として二酸化チタン粉末もしく
は二酸化チタン粉末とカーボンブラツクを使用し
たシリコーン系コーテイング材組成物は低粘度，
高チクソトロピー性高強度というデイツプコート
用として優れた性能を有するものである。
（実施例）
以下実施例について説明する。
実施例 １
見かけ粘度12.000cps（Ｂ型回転粘度計にて回転
数10rpm，ロータNo.７で回転開始から１分後の粘
度），チクソトロピー性を示す数値ｎ＝0.35であ
る。ポリアルキルアルケニルシロキサン及びポリ
アルキル水素シロキサンを主成分とするシリコー
ン系組成物100重量部に対し、一次平均粒径
20mμ，比表面積50m2／ｇである二酸化チタン粉
末を20重量部添加した。
ここで、
ｎ＝｜logη4−logη10／log4−log10｜
η4＝4rpmで測定した粘度，η10＝10rpmで測定
した粘度で、それぞれ回転開始から１分後の粘度
である。
（注）ηの値が大きい程チクソトロピー性が高い
ことを示す。
この様にして得られた組成物の性能を表１に示
す。
実施例 ２
実施例１で得られた組成物にカーボンブラツク
を１重量部添加したところ、見かけ粘度が低下し
作業性が向上した、これを第１表に示す。
比較例 １
実施例と同様なシリコーン系組成物100重量部
に対し、一次平均粒径40mμ，比表面積50m2／ｇ
であるシリカ粉末を20重量部添加した。
この様にして得られた組成物は見かけ粘度が高
すぎてデイツプ作業性が著しく悪くなつた、これ
を第１表に示す。
比較例 ２
実施例１と同様なシリコーン系組成物100重量
部に対し、一次平均粒径120mμ，比表面積10m2／
ｇである二酸化チタンを20重量部添加した。
この様にして得られた組成物は、チクソトロピ
ー性が低いため、デイツプ作業時に液ダレ等が発
生し操作性が悪い、これを第１表に示す。
実施例 ３
実施例１と同様なシリコーン系組成物100重量
部に対し、一次平均粒径20mμ，比表面積50m2／
ｇである二酸化チタンを40重量部，カーボンブラ
ツクを２重量部添加した、これを第１表に示す。
[Object of the Invention] (Industrial Application Field) The present invention relates to a coating material composition, particularly a silicone-based coating material for dip coating, and is used as a moisture-proof insulation coating for hybrid ICs. (Prior art) As the prior art related to the present invention, Japanese Patent Application Laid-open No. 59-
There is a publication number 176347. Conventional materials for dip coating have a so-called thixotropic property, in which the apparent viscosity is low when shear stress is applied, such as during dip work, and the apparent viscosity is high when there is no shear stress, such as after dip work. The higher the viscosity, the better.Furthermore, the lower the apparent viscosity during dip coating, the better the workability.Also, it is required to have a strong film strength after curing. refers to a composition whose main component is organopolysiloxane), in which fine-particle silica powder is added to improve thixotropy and film strength. (Problems to be Solved by the Invention) However, when adding fine silica powder to improve the thixotropy and film strength, if the amount exceeds several tens of parts by weight, agglomeration may occur.
Since the viscosity becomes high, the dipping operation becomes difficult, so there is a problem that higher thixotropy and film strength cannot be obtained. The technical object of the present invention is to provide a silicone-based coating material composition for dip coating that has high thixotropy and strong film strength. [Structure of the Invention] (Means for Solving the Problems) The means for solving the above-mentioned technical problems is to add particles having a primary average particle size of 5.0 to 100 mμ as an additive to a composition containing organopolysiloxane as a main component. A titanium dioxide powder having a specific surface area of 20 m 2 /g or more, or a coating material composition containing the titanium dioxide powder and carbon black, in which the titanium dioxide is added to 100 parts by weight of a composition containing organopolysiloxane as a main component. Add 5.0 to 150 parts by weight, or per 100 parts by weight of the organopolysiloxane composition,
This is a coating material composition containing 0.5 to 5.0 parts by weight of carbon black. (Operation) The technical means operates as follows. That is, titanium dioxide powder is added for the purpose of increasing thixotropy, but compared to conventional fine particle silica powder, titanium dioxide powder has a characteristic that it has a lower apparent viscosity when given the same thixotropy. The cause of this is presumed to be the crystal structure, particle surface condition, etc. (see Example 1 and Comparative Example 1), but if titanium dioxide powder is used as an additive, the same apparent viscosity will be lower than when fine-particle silica powder is used. High thixotropy can be obtained. Furthermore, since titanium dioxide powder exhibits a lower increase in apparent viscosity depending on the amount added than fine-grain silica powder (see Example 1 and Comparative Example 1), high filling becomes possible and film strength increases. The primary average particle size of the titanium dioxide powder that provides such effects is preferably 5.0 to 100 mμ, and the specific surface area is preferably 20 m 2 /g or more (see Example 1 and Comparative Example 2). The amount added is 5.0 to 150 parts by weight per 100 parts by weight of the base silicone composition, which provides a good balance between thixotropy, film strength, and apparent viscosity, resulting in good workability, and even if the surface treatment of titanium dioxide powder is performed, It doesn't matter if you don't do it. It is also effective to add carbon black to reduce the apparent viscosity, improve workability, and enable high filling of titanium dioxide powder (see Examples 1, 2, and 3). The amount added can be selected arbitrarily, but considering insulation properties, it should be 0.5 to 100 parts by weight of the base silicone composition.
5.0 parts by weight is good. In this way, silicone coating material compositions using titanium dioxide powder or titanium dioxide powder and carbon black as additives have low viscosity,
It has excellent performance for dip coats, with high thixotropy and high strength. (Example) Examples will be described below. Example 1 Apparent viscosity was 12.000 cps (viscosity 1 minute after the start of rotation using a B-type rotational viscometer at a rotational speed of 10 rpm and rotor No. 7), and a numerical value n indicating thixotropy was 0.35. For 100 parts by weight of a silicone composition containing polyalkylalkenylsiloxane and polyalkylhydrogensiloxane as main components,
20 parts by weight of titanium dioxide powder having a specific surface area of 20 mμ and a specific surface area of 50 m 2 /g was added. Here, n=|logη 4 −logη 10 /log 4 −log 10 | η 4 = viscosity measured at 4 rpm, η 10 = viscosity measured at 10 rpm, each of which is the viscosity 1 minute after the start of rotation. (Note) The larger the value of η, the higher the thixotropy. Table 1 shows the performance of the composition thus obtained. Example 2 When 1 part by weight of carbon black was added to the composition obtained in Example 1, the apparent viscosity decreased and the workability improved, as shown in Table 1. Comparative Example 1 For 100 parts by weight of the same silicone composition as in Example, the primary average particle diameter was 40 mμ, and the specific surface area was 50 m 2 /g.
20 parts by weight of silica powder was added. The composition thus obtained had an apparent viscosity that was so high that the dip workability was extremely poor, as shown in Table 1. Comparative Example 2 For 100 parts by weight of the same silicone composition as in Example 1, the primary average particle diameter was 120 mμ, and the specific surface area was 10 m 2 /
20 parts by weight of titanium dioxide was added. Since the composition thus obtained has low thixotropy, it causes dripping during dipping, resulting in poor operability, as shown in Table 1. Example 3 For 100 parts by weight of the same silicone composition as in Example 1, the primary average particle diameter was 20 mμ, and the specific surface area was 50 m 2 /
40 parts by weight of titanium dioxide and 2 parts by weight of carbon black are shown in Table 1.
【表】
き込み等がないかどうかを評価した。
〔発明の効果〕
高いチクソトロピー性を得る方法としては、
(1)[Table] We evaluated whether there were any scratches, etc.
[Effect of the invention] As a method for obtaining high thixotropy, (1)
【式】といつた様な側鎖の大き
なシロキサンを添加する方法が考えられ、又、
強靭な皮膜強度を得る方法とては、
(2) シリコン系コーテイング材組成物の主剤とさ
れるシロキサンにおける有機基の一部をフエニ
ル基とする方法、
が考えられ、両者を同時に用いることにより、高
いチクソトロピー性で高強度な組成物が得られ
る。
しかし前記(1)については合成が困難で、高粘度
になるといつた欠点があり、(2)については僅か数
％しか引張強度を向上できないといつた欠点があ
る。
本発明は入手容易な二酸化チタン粉末、又は二
酸化チタン粉末とカーボンブラツクを添加するだ
けであるために製造が容易であり、又高充填が可
能であるので飛躍的に皮膜強度を上げることがで
きるのである。
又無機系添加剤を使用するこから線膨張係数が
小さくなり冷熱衝撃性が良くなるという効果もあ
る。A method of adding siloxane with a large side chain as shown in [Formula] is considered, and
Possible methods to obtain strong film strength include (2) a method in which some of the organic groups in siloxane, which is the main ingredient of the silicone coating material composition, are phenyl groups; by using both at the same time, A composition with high thixotropy and high strength is obtained. However, (1) has the drawback that it is difficult to synthesize and has a high viscosity, and (2) has the drawback that the tensile strength can only be improved by a few percent. The present invention is easy to manufacture because it only requires adding easily available titanium dioxide powder or titanium dioxide powder and carbon black, and it is also possible to dramatically increase the film strength because high filling is possible. be. Furthermore, since the inorganic additive is used, the coefficient of linear expansion is reduced and the thermal shock resistance is improved.
Claims (1)
物に、添加剤として一次平均粒径が５〜100mμ，
比表面積が20m2／ｇ以上の二酸化チタン粉末，も
しくは前記２酸化チタン粉末とカーボンブラツク
を加えたコーテイング材組成物。 ２ オルガノポリシロキサンを主成分とする組成
物100重量部に対し、前記二酸化チタン粉末を5.0
〜150重量部添加した特許請求の範囲第１項に示
すコーテイング材組成物。 ３ オルガノポリシロキサンを主成分とする組成
物100重量部に対し、カーボンブラツクを0.5〜
5.0重量部添加した特許請求の範囲第１項に示す
コーテイング材組成物。[Scope of Claims] 1. Additives to a composition containing organopolysiloxane as a main component, with a primary average particle size of 5 to 100 mμ,
Titanium dioxide powder having a specific surface area of 20 m 2 /g or more, or a coating material composition containing the titanium dioxide powder and carbon black. 2. 5.0 parts by weight of the titanium dioxide powder per 100 parts by weight of a composition containing organopolysiloxane as a main component.
150 parts by weight of the coating material composition according to claim 1. 3 Carbon black is added in an amount of 0.5 to 100 parts by weight of a composition containing organopolysiloxane as a main component.
5.0 parts by weight of the coating material composition according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29289786A JPS63145373A (en) | 1986-12-09 | 1986-12-09 | Coating material composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29289786A JPS63145373A (en) | 1986-12-09 | 1986-12-09 | Coating material composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63145373A JPS63145373A (en) | 1988-06-17 |
| JPH0319274B2 true JPH0319274B2 (en) | 1991-03-14 |
Family
ID=17787803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29289786A Granted JPS63145373A (en) | 1986-12-09 | 1986-12-09 | Coating material composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63145373A (en) |
-
1986
- 1986-12-09 JP JP29289786A patent/JPS63145373A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63145373A (en) | 1988-06-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |