JPS6212199B2 - - Google Patents
Info
- Publication number
- JPS6212199B2 JPS6212199B2 JP12439879A JP12439879A JPS6212199B2 JP S6212199 B2 JPS6212199 B2 JP S6212199B2 JP 12439879 A JP12439879 A JP 12439879A JP 12439879 A JP12439879 A JP 12439879A JP S6212199 B2 JPS6212199 B2 JP S6212199B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- hours
- water
- strength
- weight
- 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
- 239000004568 cement Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 210000003298 dental enamel Anatomy 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims 2
- 238000010304 firing Methods 0.000 description 15
- 238000001035 drying Methods 0.000 description 11
- 238000004534 enameling Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 239000006223 plastic coating Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Aftertreatments Of Artificial And Natural Stones (AREA)
Description
【発明の詳細な説明】
本発明はホウロウ引きセメント系板の製造方法
に関し、ホウロウ引きセメント瓦の製造に有用な
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an enameled cement board, and is useful for manufacturing enameled cement roof tiles.
セメント瓦は吸水性が大であり、その吸水性改
善のために、瓦表面にプラスチツク被膜を設ける
ことが知られているが、プラスチツク被膜では耐
候性に問題がある。 Cement roof tiles have a high water absorption capacity, and it is known that a plastic coating is provided on the surface of the tiles in order to improve the water absorption capacity, but the plastic coating has problems in weather resistance.
セメント瓦にホウロウを焼付けることができれ
ば、吸水性、耐候性の何れにも秀れた被膜を設け
ることができ、有利である。 It would be advantageous if enamel could be baked onto cement tiles, since it would be possible to provide a coating with excellent water absorption and weather resistance.
セメント製品のホウロウ引きには、ホウロウ焼
成時での製品強度の低下を抑制するために低融点
ホウロウ釉薬が必要であり、かゝるホウロウ釉薬
として融点約600℃の特殊ホウロウ釉薬（SiO2：
38.75重量％、TiO2：3.89重量％、ZnO：2.73重
量％、Na2CO3：12.45重量％、PbCO3：42.19重
量％の組成）が開発されている。 Enameling cement products requires a low-melting point enamel glaze to suppress the decline in product strength during enameling firing, and a special enamel glaze with a melting point of approximately 600°C (SiO 2 :
38.75% by weight, TiO 2 : 3.89% by weight, ZnO: 2.73% by weight, Na 2 CO 3 : 12.45% by weight, PbCO 3 : 42.19% by weight).
上記ホウロウ釉薬をセメント板に焼付ける場
合、セメント板を完全に養生したのちに、焼付け
を行つたのでは、マドリツクスの完全硬化のため
に、セメント板の爆裂を回避できない。 When baking the above-mentioned enamel glaze onto a cement board, if the cement board is completely cured before baking, it will not be possible to avoid explosion of the cement board due to the complete hardening of the matrix.
このため、未養生セメント板を乾燥し、これに
ホウロウを焼付け、この焼付け後に最終的な養生
を行うことが提案されている。又、ホウロウ焼付
けによりセメント板の強度が、通常のセメント板
の強度に較べて低下することは避けられず、強度
回復のために、ホウロウ焼付後、水中に浸漬する
ことも提案されている。 For this reason, it has been proposed to dry an uncured cement board, bake enamel onto it, and perform final curing after this baking. Furthermore, it is inevitable that the strength of the cement board is lowered compared to the strength of ordinary cement boards due to enameling, and it has been proposed to immerse the board in water after enameling to restore the strength.
しかしながら、本発明者等の実験結果によれ
ば、上記の強度回復処理を施しても、その強度
は、焼成なしの通常のセメント板の強度に対し、
たかだか90％程度である。 However, according to the experimental results of the present inventors, even after the above-mentioned strength recovery treatment, the strength is still lower than that of a normal cement board without firing.
It is about 90% at most.
ところで、ホウロウ焼付けに伴う上記セメント
板の強度低下の原因としては種々のものが考えら
れるが、連鎖状結晶化前の遊離Ca（OH）2が脱水
し、その結果、生成したCaOが消化する（CaO＋
H2O→Ca（OH）2）ときの膨脹も、その膨脹によ
りクラツクが惹起されることからして、一原因で
あると考えられる。而して、上記焼成前の未養生
板の乾燥条件は、上記した遊離Ca（OH）2の量と
密接な関係があり、乾燥条件の改良によつて、ホ
ウロウ焼付けに伴うセメント板の強度低下を軽減
できると考えられる。 By the way, various reasons can be considered for the decrease in strength of the cement board due to enameling baking, but free Ca(OH) 2 before chain crystallization is dehydrated, and as a result, the generated CaO is digested ( CaO＋
The expansion caused by H 2 O→Ca(OH) 2 ) is also thought to be a cause, since the expansion causes cracks. Therefore, the drying conditions of the uncured board before firing are closely related to the amount of free Ca(OH) 2 mentioned above, and by improving the drying conditions, the strength reduction of the cement board due to enameling can be reduced. It is thought that it is possible to reduce the
而るに、従来においては、焼成時の水分蒸発に
伴うクラツクの発生防止という点から、恣意的な
乾燥が行われているに過ぎず、乾燥条件の改良が
必要である。 However, in the past, arbitrary drying has been carried out only from the viewpoint of preventing the occurrence of cracks due to moisture evaporation during firing, and it is necessary to improve the drying conditions.
本発明に係るホウロウ引きセメント系板の製造
方法は、上述の点に鑑みて発明された方法であ
り、混水セメント系原料から板材を成形し、該板
材を100〜120℃、５〜２時間の条件で乾燥し、次
いでホウロウを焼付け、而るのちに、水中に浸漬
することを特徴とする方法である。 The method for producing an enameled cement-based board according to the present invention is a method invented in view of the above-mentioned points, in which a board is formed from a water-mixed cement-based raw material, and the board is heated at 100 to 120°C for 5 to 2 hours. This method is characterized by drying under the following conditions, then baking the enamel, and then immersing it in water.
以下、本発明を実施例によつて説明する。 Hereinafter, the present invention will be explained with reference to Examples.
実施例 １
セメント：60重量部、骨材：40重量部（頁岩：
10重量部、高槻砕石：30重量部）からなるドライ
固型分原料を混合し、固型分原料に対し外割で８
％の水を給水し、更に混合し、この混練原料を、
320Kg／cm2×１分間の加圧条件で厚さ10mmの板状
に成形した。Example 1 Cement: 60 parts by weight, aggregate: 40 parts by weight (shale:
10 parts by weight, Takatsuki crushed stone: 30 parts by weight), and the total amount of solid material is 8 parts by weight.
% of water is added, mixed further, and this kneaded raw material is
It was molded into a 10 mm thick plate under pressure conditions of 320 Kg/cm 2 ×1 minute.
この成形板に、前述した特殊ホウロウ釉薬（主
剤：100部、顔料：５部、分散剤：１部、水：75
部）をスプレーにより塗布した。 The above-mentioned special enamel glaze (base agent: 100 parts, pigment: 5 parts, dispersant: 1 part, water: 75 parts) was applied to this molded plate.
part) was applied by spraying.
次いで、100℃で30分，１時間，２時間，３時
間，４時間，５時間，５時間30分、11℃で30分，
１時間，２時間，３時間，４時間，５時間，５時
間30分、120℃で30分，１時間，２時間，３時
間，４時間，５時間30分の各条件で乾燥した21種
の板材のそれぞれを650℃×30分の条件で焼成
し、焼成後、７日間水中浸漬し、而るのち１日
間、風乾した。 Next, at 100℃ for 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 5 hours and 30 minutes, and 30 minutes at 11℃.
21 types dried for 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 5 hours 30 minutes, 30 minutes at 120℃, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours 30 minutes. Each of the plates was fired at 650°C for 30 minutes, and after firing, they were immersed in water for 7 days, and then air-dried for 1 day.
なお、比較のため、焼成前の上記100〜120℃の
乾燥に代え、90，130℃の各温度のもとでも焼成
前の乾燥を行つた。 For comparison, instead of the above drying at 100 to 120°C before firing, drying before firing was also carried out at temperatures of 90 and 130°C.
上記実施例、比較例について、水中浸漬による
セメント板の強度回復率（水中浸漬後の曲げ強
度／焼成前の曲げ強度）を測定したところ、第１
図の通りであつた。 Regarding the above Examples and Comparative Examples, when the strength recovery rate of the cement board by immersion in water (bending strength after immersion in water/bending strength before firing) was measured, the first
It was as shown in the picture.
実施例 ２
セメント：36重量部、粉末珪砂：24重量部、骨
材：40重量部（頁岩：10重量部、高槻砕石：30重
量部）を固型分原料として、実施例１と同様に、
製板、ホウロウ塗布、乾燥、焼成を行い、焼成後
は直に１日間水中浸漬し、而るのち、オートクレ
イブにより最終的に養生した。Example 2 Cement: 36 parts by weight, powdered silica sand: 24 parts by weight, aggregate: 40 parts by weight (shale: 10 parts by weight, Takatsuki crushed stone: 30 parts by weight) were used as solid raw materials, and in the same manner as in Example 1.
Board making, enameling, drying, and firing were performed, and after firing, the board was immediately immersed in water for one day, and then finally cured in an autoclave.
なお、焼成前の100〜120℃の乾燥の他、比較の
ために、90，130℃の各温度のもとでも焼成前の
乾燥を行つた。 In addition to drying at 100 to 120°C before firing, for comparison, drying before firing was also performed at temperatures of 90 and 130°C.
上記実施例２、比較例について、水中浸漬によ
るセメント板の強度回復を知るため、焼成前乾
燥、焼成並びに水中浸漬を行わなかつたセメント
板の曲げ強度Ａと実施例、比較例におけるオート
クレイブ養生後のセメント板の曲げ強度Ｂとの比
Ｂ／Ａ（回復率）を測定したところ第２図の通り
であつた。 Regarding the above Example 2 and Comparative Example, in order to understand the strength recovery of the cement board by immersion in water, we compared the bending strength A of the cement board that was not dried before firing, fired, or immersed in water after autoclave curing in Example 2 and Comparative Example. The ratio B/A (recovery rate) to the bending strength B of the cement board was measured and was as shown in Figure 2.
第１図、第２図から明らかなように、本発明に
よれば、焼成前の乾燥条件の選定の結果、焼成に
伴うセメント板の強度低下を軽減でき、水中浸漬
による強度回復処理によつて、充分な曲げ強度を
有するホウロウ引きセメント板を得ることができ
る。 As is clear from FIGS. 1 and 2, according to the present invention, as a result of selecting the drying conditions before firing, the decrease in strength of the cement board due to firing can be reduced, and strength recovery treatment by immersion in water can reduce the decrease in strength of the cement board. , an enameled cement board having sufficient bending strength can be obtained.
第１図並びに第２図は本発明によつて製造され
たホウロウ引きセメント板における水中浸漬後で
の曲げ強度の回復結果を示す図表である。
FIGS. 1 and 2 are charts showing the results of recovery of the bending strength of enameled cement plates manufactured according to the present invention after being immersed in water.
Claims (1)
材を100〜120℃、５〜２時間の条件で乾燥し、次
いで、ホウロウを焼付け、而るのちに、水中に浸
漬することを特徴とするホウロウ引きセメント系
板の製造方法。1 A plate material is formed from a water-mixed cement-based raw material, the plate material is dried at 100 to 120°C for 5 to 2 hours, and then the enamel is baked, and then it is immersed in water. A method for producing enameled cement-based boards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12439879A JPS5650182A (en) | 1979-09-26 | 1979-09-26 | Manufacture of enameled cementitious board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12439879A JPS5650182A (en) | 1979-09-26 | 1979-09-26 | Manufacture of enameled cementitious board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5650182A JPS5650182A (en) | 1981-05-07 |
| JPS6212199B2 true JPS6212199B2 (en) | 1987-03-17 |
Family
ID=14884441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12439879A Granted JPS5650182A (en) | 1979-09-26 | 1979-09-26 | Manufacture of enameled cementitious board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5650182A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57205388A (en) * | 1981-06-08 | 1982-12-16 | Kubota Ltd | Manufacture of enameled cement moldings |
-
1979
- 1979-09-26 JP JP12439879A patent/JPS5650182A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5650182A (en) | 1981-05-07 |
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