JPS6267427A - Measurement of contact angle of water for porous material - Google Patents
Measurement of contact angle of water for porous materialInfo
- Publication number
- JPS6267427A JPS6267427A JP20842285A JP20842285A JPS6267427A JP S6267427 A JPS6267427 A JP S6267427A JP 20842285 A JP20842285 A JP 20842285A JP 20842285 A JP20842285 A JP 20842285A JP S6267427 A JPS6267427 A JP S6267427A
- Authority
- JP
- Japan
- Prior art keywords
- water
- contact angle
- radius
- pore
- pore volume
- 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.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
【発明の詳細な説明】
（技術分野）
本発明は多孔質材料における水の接触角の測定法に関す
る。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for measuring the contact angle of water in porous materials.
（背景技術）
多孔質材料、特に外装建材には、一般に撥水処理を行う
ことが広く用いられている。これは雨水や結露水などの
水分の外装建材への浸入による悪影響金防ぐ丸めである
。この場合、外装建材への水の浸入しやすさの程度は水
の材料に対する接触角で評価することができる。すなわ
ち水の接触角の大きさは、外装建材などでは、１喪な物
性値である。しかし、従米、多孔質材料に対する水の接
触角の測定については、測定法が提案されていなかった
。これはプラスチックなどの烏分子材料と水との接触角
は、顕微鏡を用いて直接測定することができるが、多孔
質材料における孔内表面と水との接触角は、顕微鏡では
測定できないからである。(Background Art) Water repellent treatment is generally widely used for porous materials, especially exterior building materials. This rounding prevents harmful effects caused by moisture such as rainwater and condensation water infiltrating the exterior building materials. In this case, the degree to which water easily infiltrates the exterior building material can be evaluated by the contact angle of water with the material. In other words, the contact angle of water is an important physical property value for exterior building materials. However, no method has been proposed for measuring the contact angle of water on porous materials. This is because the contact angle between water and a material such as plastic can be directly measured using a microscope, but the contact angle between the inner pore surface of porous materials and water cannot be measured using a microscope. .
（発明の目的）
本発明に多孔質材料と水との接触角の測定を行う方法を
提供することを目的とする。(Objective of the Invention) An object of the present invention is to provide a method for measuring the contact angle between a porous material and water.
（発明の開示）
本発明の多孔質材料における水の接触角を測定するため
には、第１図に示すような装ｆｉ’を用いる０
図において１は透明アクリル製容器で、この容器内にフ
ィルタ２を水平に固定する。この容器の下方にはコック
を介してＵ字形の肉厚ビニルチュー フ３ ｋ接続し、
このビニルチューブの他端にはガラス大の逆Ｕ字管４７
＆：、連結し、このＵ字管の他端はビューレット５内に
開口する。(Disclosure of the Invention) In order to measure the contact angle of water in the porous material of the present invention, a device as shown in Fig. 1 is used. Fix filter 2 horizontally. A U-shaped thick vinyl tube 3k is connected to the bottom of this container via a cock.
At the other end of this vinyl tube is a glass-sized inverted U-shaped tube 47.
&: are connected, and the other end of this U-shaped tube opens into the buret 5.
６はゴム帽を示す。７は接触角を測定しようとする資料
（多孔質材料）で、測定に当っては、この資料を水中（
脱気水ケ用いる）（（浸漬して水分を充分に含浸せしめ
る。ついで、この資料全フィルタ２にのせて、フィルタ
を通過し之水の量を測かる０８は容器の上方にかぶせた
ビニールカバー全示す。フィルタの細孔は後述するよう
にケルビンの式１りｈ’を代入してｒ。が求められたと
き、フィルタの細孔はｒ。以下のものを用いる。6 indicates a rubber cap. 7 is the material (porous material) on which the contact angle is to be measured.
(Use deaerated water) The pores of the filter are determined by substituting h' into Kelvin's equation 1 as will be described later.When r is obtained, the pores of the filter are r.The following is used.
測定に当っては、図中ＡとＭとの距離ｈ’４定めて（例
えば１ｍ又は２ｍ）とし、このｈにおいて、ビューレッ
ト５の内にたまる水の量を測定する。水を含浸させない
場合の、資料の重さ’！５ Ｘ （ｆ） 、 ビュー
レット中の水の’Ｍｌ ｋ ’Ｉ （ｃｃ）とすると、
ｚ＝ｙ／ｘ （ｃｃ／ｒ）全測定する。In the measurement, a distance h'4 between A and M in the figure is determined (for example, 1 m or 2 m), and the amount of water accumulated in the buret 5 is measured at this distance h'4. The weight of the material when not impregnated with water'! 5 X (f), 'Ml k 'I (cc) of water in the buret,
z=y/x (cc/r) Measure all.
次に同じ種類の多孔質材料について水銀圧入法（水銀中
に資料全浸漬し、水銀に加える圧力を変化式せて）にＬ
り第２図に示す工うに、細孔半径と細孔容積との関係を
求めておく。Next, the same type of porous material was subjected to the mercury intrusion method (the entire material was immersed in mercury, and the pressure applied to the mercury was varied).
As shown in Figure 2, the relationship between the pore radius and pore volume is determined.
次に接触角に関するクルビンの式
％式％
ここに ｒ、・１毛細管半径（−、）
δ・・・水の表面張力 ７２．７５ Ｘ １０−” （
Ｔ／ｍ’ ）ρ・・・水の密度 １０００麺／−
ｈ・・・水面差（ｍ）
θ・・・接触角
この式でθ＝０．ｈ＝２に入れると、ｒ＝７．５μｍと
なる。すなわちｈ −２ｍで水の接触角がＯであれば、
半径７．５μｍ以上の細孔半径中の水分は、抜けること
となる。ここで第２図の曲線よシ細孔半径７．５μｍの
場合、細孔容積は０．２ｃｃ／７がえられ、７．５μｍ
に対しては０．２ｃｃ／７の水が抜ける筈である。Next, Kulbin's formula for contact angle% formula% Here r, ・1 Capillary radius (-,) δ...Surface tension of water 72.75 X 10-" (
T/m')ρ...Water density 1000 noodles/-h...Water level difference (m) θ...Contact angle In this formula, θ=0. If h=2, then r=7.5 μm. In other words, if the contact angle of water is O at h -2m,
Moisture in pores with a radius of 7.5 μm or more will escape. According to the curve in Figure 2, if the pore radius is 7.5 μm, the pore volume is 0.2 cc/7, which is 7.5 μm.
0.2cc/7 of water should escape.
しかるに第１図の装置によって測定されｆｃ ｚ ＝ｙ
／ｘが０．２５ ｃｃ／７であるとすると、第２図の曲
線より半径６がえられる。ｒ／ ｃｏｓ−一定であるか
ら、
７ 、５ ／ ００８θ＝＝ ６／ ｃｏ８θの式より
θ境３７″
かえられる。However, when measured by the apparatus of FIG. 1, fc z =y
If /x is 0.25 cc/7, a radius of 6 is obtained from the curve in FIG. Since r/cos is constant, the θ boundary can be changed by 37″ from the formula 7, 5/008θ==6/co8θ.
次に実施例につい−ｃＢ明丁ル。Next, regarding Examples - cB Ming Dingle.
（発明の効果）
従来は多孔質材料と水の接触角は測定が困難であったが
１本発明の方法によれば測定が可能となり、これにＬシ
羽科の撥水性の評価ができ、材料の信租性向上會図るこ
とができる。(Effects of the Invention) Conventionally, it was difficult to measure the contact angle between porous materials and water; however, the method of the present invention makes it possible to measure the contact angle, and it is also possible to evaluate the water repellency of L. It is possible to improve the reliability of materials.
第１図は本発明方法において用いられる装置、第２図は
細孔半径と細孔容積との関係を示す曲線である。
５・・・・・・ビューレット、７・・・・・・測定しよ
うとする資料FIG. 1 shows an apparatus used in the method of the present invention, and FIG. 2 shows a curve showing the relationship between pore radius and pore volume. 5... Buret, 7... Material to be measured
Claims (1)
ぶ）と同じ材料について、水銀圧入法により、細孔半径
と細孔容積との関係を求め、（ロ）次に資料に脱気水を
充分に含浸せしめ、これをフィルタ上に載せ、このフィ
ルタを通つて抜け出た水量（ｙとする）をビューレット
に受け、資料の重さをｘとするときｚ＝ｙ／ｘ（ｃｃ／
ｇ）を計算し、 （ハ）ケルビンの式ｒ＝２δｃｏｓθ／９．８ρｈここ
にｒ・・・毛細管半径（ｍ） δ・・・水の表面張力７２．７５×１０＾−＾３（Ｔ／
ｍ＾２）ρ・・・水の密度１０００Ｋｇ／ｍ＾３ ｈ・・・水面差（ｍ） θ・・・接触角 においてθ＝０とし、ｈを代入して毛細管半径（ｍ）ｒ
＿０を算出し、 （ニ）予め求めた細孔半径と細孔容積の関係曲線より、
求めたｒ＿０に対応する細孔容積ｖ＿０を求め、（ホ）
さきに求めたｚとより細孔半径と細孔容積の関係曲線よ
りｚに対応する細孔半径ｒ＿１を求め、ｒ＿０ｃｏｓ０
＝ｒ＿１ｃｏｓθ の式より接触角θを求めることを特徴とする多孔質材料
における水の接触角の測定法。[Claims] (a) For the same material as the porous material to be measured (hereinafter referred to as data), the relationship between pore radius and pore volume is determined by mercury intrusion method, and (b) the following: First, thoroughly impregnate the material with deaerated water, place it on a filter, and receive the amount of water (denoted as y) that has passed through the filter into a burette.If the weight of the material is x, then z = y. /x(cc/
(c) Kelvin's equation r = 2 δ cos θ / 9.8 ρh where r...capillary radius (m) δ... surface tension of water 72.75
m^2) ρ...Water density 1000Kg/m^3 h...Water level difference (m) θ...Set θ=0 at the contact angle and substitute h to obtain the capillary radius (m) r
Calculate _0, and (d) From the predetermined relationship curve between pore radius and pore volume,
Find the pore volume v_0 corresponding to the found r_0, and (e)
The pore radius r_1 corresponding to z is determined from the relationship curve between the pore radius and the pore volume based on the previously determined z, and r_0cos0
A method for measuring the contact angle of water in a porous material, characterized by determining the contact angle θ from the formula: =r_1cosθ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20842285A JPS6267427A (en) | 1985-09-20 | 1985-09-20 | Measurement of contact angle of water for porous material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20842285A JPS6267427A (en) | 1985-09-20 | 1985-09-20 | Measurement of contact angle of water for porous material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6267427A true JPS6267427A (en) | 1987-03-27 |
Family
ID=16555957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20842285A Pending JPS6267427A (en) | 1985-09-20 | 1985-09-20 | Measurement of contact angle of water for porous material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6267427A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575621A (en) * | 2013-10-23 | 2014-02-12 | 山东建筑大学 | Method for measuring apparent contact angle of liquid on surfaces of particles |
-
1985
- 1985-09-20 JP JP20842285A patent/JPS6267427A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575621A (en) * | 2013-10-23 | 2014-02-12 | 山东建筑大学 | Method for measuring apparent contact angle of liquid on surfaces of particles |
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