JPS5841747A - Manufacture of inorganic hardened body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention An inorganic hardened body (such as a faI plate) containing cement and ettringite as main components and a method for producing the same are already known. For example, calcium aluminate mononalphate hydrate (3CaO・M1soa・Ca 1104・
123io *hereinafter referred to as M8H), using CI4, mix this and an appropriate amount of 5-arm with cement to make it water slender,
A method of producing ettringite in a cement matrix and obtaining a hardened product has already been filed by the applicant. The present invention provides such an m method and tm length, and a further improved method thereof.

Furthermore, various aspects of the obtained inorganic cured product,
In the case of good moisture absorption, the type of curing method was modified to reduce the level of the board's condition when the temperature changes due to freezing and thawing.

蓼) Disadvantages of the conventional example In the production of an inorganic cured body containing ettringite (hereinafter referred to as FT8M), M2 was used as a precursor of TBH.
If R, CsA@tMV'h, the reaction is 'p good,
After producing a green sheet using a shaping method such as the sand method, it can be immediately transferred to a curing factory. However, if it is immediately transferred to a curing factory and cured, the green sheet will be heated by 1 kg. There is a temperature difference in the temperature difference that creates a part where 'r8i1 conversion progresses very quickly, and a part where hp does not progress. Alternatively, when performing heat curing, it is not always possible to maintain a sufficient temperature, and in most cases
ToDl at about 80$BH Because of this, it is unfortunate that the water necessary for TBH cannot be secured. Moreover, after careful curing,
It is necessary to leave it in its natural state for natural curing, but in that case, place the hot sheet in the outside air at room temperature. As a result, rapid dehydration occurs (particularly, there is a shortage of moisture necessary for hardening in direct contact with the outside air. On the other hand, the extension of the heat curing time prevents the completion of the 6'rga conversion reaction. 5 it-Jul is a disgrace.

1 In any case, if t>m crystallization occurs before the T811 reaction is completed, as mentioned above, fcTBH formation progresses with contact with moisture in practical conditions, and its expansion causes distortion. This is the cause of cracks and cracks when writing is frozen.

18) Structure of the Invention The present invention is based on the hardened body of Tan@Meet, for example, building boards for construction, and the raw materials are Rei 8, C1, etc., and gypsum is an abbreviation. 11m
Prepare the amount according to the ratio of each ingredient, and use it as t cement) 111
6 Rui is CaO, Ca(Oll)s and slag funding system (
(This is also treated as cement) K is mixed, reinforcing materials, aggregates, etc. are blended as necessary, and it is applied to the G method to make it hydraulically hard. In this case, the raw material is mixed with water to form a slurry, a green sheet (uncured sheet) is obtained by a shaping method such as a binding method, and this is pre-cured in a warm temperature.
Then, after heat curing and moist heat curing, the trout has moisture on the curing board, and then natural curing has mold. The preferred pre-curing temperature is 10 to 40°C, and the preferred time is 2 to 10 hours. If this time is less than 2 hours, the rag reaction and cement reaction will hardly proceed, and the significance of pre-curing will be diminished. t&10
If the time is tI, the TBH reaction and cement reaction will proceed too much, generate heat, and water will fly off the green sheet, which will easily lead to non-uniform reaction during heat curing. QKTIJH reaction will proceed too quickly. This will cause the green sheet to expand. In this invention, the Ta1l reaction is left in a state where it has progressed a little, and both reactions are made to proceed rapidly in the thermal curing process.

The heat curing is preferably performed at a concentration of 79% B11 or higher, 40%
The process is carried out at ~80c for more than 8 hours, and the resulting semi-virtuous sheet is hydrated and given natural curing with rimes. Hydration is done by spraying water or soaking a semi-cured sheet in water.The temperature of the water is medium-hot water according to the temperature of the raw sheet.
, the amount of hydration is s 2 s Wt1 for the cured body-puja
The above is preferable, and the livestock line 3swt- or more is preferable.
Natural curing is preferably for 2 days or more.I Lj/'*Natural curing is preferably carried out by covering it with a plastic sheet to prevent moisture sensitivity as much as possible'*L/I/%11 After natural curing, drying is carried out. cormorant.

Honji @K or I do not have any particular restrictions on the blending of raw materials, but if the precursor (including gypsum) is used in the amount of 10 to 100%, the cured product will contain 5 to 10% It will be done.

If it is less than 5wt, the processability and other properties of the cured product will not be sufficient, and the original properties of the cured product will be difficult to demonstrate.
If it exceeds %, mechanical! 1118! There are shortcomings such as
Shichimen) - To take advantage of the characteristics of the TBH hardened material
However, the situation using blast furnace slag is 144. Blast furnace slag and Cab instead of cement
, Ca (O1QsO mixed system 1w may also be used.

In addition to the above-mentioned main raw materials, various additive raw materials are used as necessary, such as pulp, glass fiber, synthetic fiber, etc. as reinforcing materials, perlite, etc. as aggregates, synthetic resins, and surfactants. Those commonly used in the production of inorganic cured products are used. The amount to be used is appropriately determined depending on the purpose of use of the cured product, etc.

-) Examples, comparative examples A green sheet tal was manufactured using the paper manufacturing method using the following formulation.

Blast furnace top) CC type) 70 wtlgMBH1
8# Dihydrogypsum 61 Pulp 6.

*m=a raw material for 2 to 10 hours at lO~30C was added to the glass fiber l 1 green sheet, and then heat curing tubes 70C and 801 were added.
The test was carried out at 1RH for 10 hours. Next, the sample was showered with hot water at 70° C. (until the R* rate reached the indicated amount), covered with a sheet, and allowed to naturally cure for 3 days. Thereafter, the cured product was dried until it reached a constant weight @OC to obtain a cured plate.

Cured body tST subjected to freeze-thaw test using MITM-1 method
Y pull! ! X12XIJaa, density Log/-.

In the method for producing a hardened product containing Ill as the main component, ettringite precana and gypsum are mixed with cement, shaped in the presence of water, and then cured at room temperature.
The sheet is then cured with moist heat, and then the curing sheet is rehydrated, and then natural curing is carried out.Since it is characterized by containing one root, it has the effect of reducing the number of plates in practical use.

patent applicant Matsushita Electric Works Co., Ltd. Meisha Toshimaru Takemoto, Daiya Bento Attorney (2 others) 24

Claims (1)

[Claims] (1) Cement) 1 of the cured product containing 11it as the main component
In the s method, JIiK ettringite precursor and gypsum are blended, shaped in the presence of water, cured at room temperature, then heat cured, and then the curing sheet is rehydrated. A method for preparing an inorganic cured product containing natural curing tmζsuko@. Key) The preparation method according to claim 1, wherein the curing conditions at room temperature are 2 to 10 hours at io to 40C. (Note) Heat curing conditions are 40-10'O℃, 7o-edition. The manufacturing method according to mm1*t or claim 2, wherein the mold and t4I mold are produced for at least 8 hours. (4) The preparation method described in Section 1 of the IIS Collection of 4$1'F# request, in which hydration after warming and curing is done with warm ice. 6) Patent claim WIM41 in which the amount of hydration is 251 or more based on the solid content of the cured product.
1e mounted oH method.