JPS60204656A - Xonotlite forming material - 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 The present invention is directed to molding of Sono 1 Lie 1 system, 41+, especially W
; degree is ().

1 () Ultra-light xonotrite-based calcium silicate after ε bani 11 and 111j 1. Molding material useful for manufacturing molded objects],・
1.

The molded body is widely used in building materials, furnaces, etc. as a fireproof 4=A material with good heat insulation properties.Lightweight Xonotlite Various methods have been proposed and implemented as methods for producing molded bodies, but the most representative method is basically to mix silicic acid raw material and limestone powder 1 with a large amount of water. In this method, a slurry of self-hardening xonotlite crystals is generated by heating to high temperature in an autoclave, which is molded and then dried and hardened. Zonotlite crystals rarely exist as single crystals, and most of them aggregate and combine to form secondary particles.The conventionally known spherical secondary particles were
6-16] There are also cases where single crystals are just irregularly aggregated, such as the one described in Publication No. 02, but those 1)
(Those that can be used as molding materials on their own often form well-defined spheres. The diameter of these spherical particles is usually 1()~
1 (month)/J, and there is a peak in the particle size distribution near 20 to 60 horns (;l).
The crystals protrude like chestnut squid, and are hollow inside.
It is in a state close to that.

On the other hand, in the course of a series of research on the production of shiftrite-based molding materials, the present inventors discovered that the secondary particles of shiftrite crystals, such as the -I series, have a different crystal aggregation state from the conventionally confirmed shiftrite crystal secondary particles. Secondary particles are manufactured in a specific manner 1! As a result of confirming the beneficial properties of these secondary particles, we have completed the present invention.

The present invention provides a -1
The spherical net η is 1() to l5(,'l/J i
A thin shell with a diameter of I-1, -) Gino 1 Rai) 61-like crystals densely aggregated and the inside of the shell! +: Due to the presence of a bulky item consisting of Ni-containing Ginotri 1 chime-shaped crystal low density aggregate book:'! 0 (1ml or more)
The object of the present invention is to provide a xonotrite-based molding material characterized by exhibiting a sedimentation volume of .

FIGS. 1 to 3 show molding phase 1-1 according to the present invention.
This is a scanning electron micrograph of a cross section of 11 secondary zonotrite crystals in a typical example of zonotrite crystals. It is clear that the interior of the invention is made of clay, which is unique as described above.

In other words, the zo/dryid crystals are
The inside of the sand is filled with a large amount of crystal voids, like the crystals in a still-cold helmet. Crystal volume voids are rarely large enough to be recognized as cavities, and even if they rarely occur, their diameter (maximum value of !it crystal lj separation) never exceeds 10% of the inner diameter of the shell. . The shell part is a hollow secondary particle shell (thickness +), 8=
5/J), it is slightly thinner than the ladle (),
5 to 4JJ, but the density of shiftrite crystals is high;
There is no possibility that it will be destroyed by normal molding. In addition to these structural features, when observed using a transmission method using an optical microscope with a magnification of 4 (), the secondary particles appear as if the inside of the grain is hollow and exhibit a large sedimentation volume. Incidentally, the sedimentation volume refers to 500+nl of Zino 1 light slurry whose concentration is adjusted to 2% by weight with an inner diameter of 501nl++ (, +
0111 This refers to the volume of the xonotlite layer that settles when placed in a graduated cylinder and allowed to stand at 2 U'C for 2 hours. Those that enable the production of lightweight molded bodies with high physical properties have a sedimentation volume of 300 ml or more, preferably 350 blind o1 or more.
There are two things.

The shifted light crystal secondary particles in the molding material according to the present invention have a chestnut-shaped surface similar to that of the conventional shifted light crystal secondary particles;
In some cases, the crystals extend in the direction along the surface of a sphere, and the surface is smooth, like the surface of a ball made by winding a thread. The latter has better moldability than the former, and can be molded to a higher height (.-).

The shiftrite-based molding material according to the present invention has a low thermal conductivity of a molded article obtained by molding it, and is particularly excellent as a molding material for manufacturing molding material in terms of heat insulation.

Next, a typical manufacturing method of the molding material of the present invention will be explained.

The method for producing the molding material of the present invention is not fundamentally different from the method for producing the conventional xonotlite-based material T94/Alt. That is, calcareous raw materials such as quicklime, slaked lime, and carbide slag, and silicic acid raw materials such as silica stone are placed in an autoclave with water, and hydrothermal synthesis is performed with stirring under temperature conditions that can produce 1/7 tri. . However, when manufacturing the molding material of the present invention, use quicklime whose CaO crystals have a mass of Q,3/J or more as 1), and pay special attention to the conditions for digesting this. It is boiled and reacted with silicic acid raw material to form lime milk with low viscosity. In addition""
The size of CaO crystal is (1,,3/J I:J(ζ
Quicklime is the average diameter of granular or fused microcrystals that are observed when a freshly fractured surface is observed with a scanning electron microscope. If it is recognized as such, the size of the primary particles is estimated from its shape.
It is thought that quicklime is known, and as far as the present inventors are aware, there is no example of it being used as a lime load 1 for producing shift dry 1. This quick ash can also be found in commercially available quick lime, but when producing quick lime, quality control that takes into account the size of Ca(,) crystals is not necessary. The size of CaO crystals is often not constant even in the same brand.

Quicklime with a CaO crystal size of 1', l, 3/J or less can most commonly be produced by calcining limestone at relatively low temperatures. A particularly suitable firing strip 1'1 satisfies the following formula.

7r <-5 (N, +1250 9o O≦'I゛≦11 S (+ ≧0.5 (I) is the firing temperature of 1°C1, and shi is the firing time [)l
r ] )” - Digestion of quicklime is done by the usual method! 'Jl
o ~ 40 times the amount of water or hot water, or avoid strong or long stirring, thereby reducing the amount of water λ'
t] It is necessary to adjust the solid content ratio to 24 times so that the viscosity when measured with type B viscosity R1 at 20° C. is lf, lcl+ or less.

Silicic acid raw materials include crystalline materials, such as silica,
It is desirable to use fine powder with an average particle size of about 5 to 15 times.

These raw materials are preferably Ca(-)/SiO, molar specific force bow! door).

90 ~ Lit), mix in a ratio of about 2 + 1
−． Make a slurry with 1 fJ times the amount of water and autoclay 7
Among them, N quality 187 ~ 2 + 1'Ci thousand power 12 = 20
React at Kg7cm2 for 2 to 5 hours.

Then, during the reaction, or at least for a period of the reaction, a strong 1 perturbation is generated, which ultimately increases the sedimentation volume of the 1!1 secondary particles of xonotlite to 3 t3 t,l.
m1 or more, preferably: 35 (1 + nl or more - L). If the sedimentation volume is less than 300 + o1, it is difficult to obtain a light whip molded product with a bulk density of t1.1 p and around 7 cm3.

The molded paulownia material according to the present invention 1, which is produced in the following manner, has exactly the same properties as the conventional xonotrite-based molding materials.
Either alone or mixed with @Seed Reinforcing Fiber M or Portland Cement, it is molded by press dehydration molding, papermaking, extrusion, etc., and then dried to harden, and the thermal conductivity increases as described in 1iii. Provides lightweight molded wood with low IJ physical properties of 1°.

IJ, de, Examples and Comparative Examples to explain the present invention, Example 1 CaO crystal ignition t, l, 28/J of quicklime was mixed with 24 times m of hot water (temperature! ltl'(' :) 】
G (digested for 30 minutes while stirring with a 4'l! winged 4'l! average particle size of the obtained 1 ash milk (viscosity 6 cp according to measurement method in 01j)] 1 −+ /J silica powder, CaO/Si
O2 molar ratio is 1. (), and at the same time,
``The combination of ash and silica powder, !i amount:'(fi) 4
Add f'; amount of water to make a homogeneous slurry, and put it in a crepe. 2+l rrun while stirring, temperature+97'C1 pressure 15 Kg7c+112, 3
Allowed time to react. The solid matter in the obtained slurry-like molding material consists essentially of xonotrite, and the xonotrite is composed of a large number of gold monocrystals aggregated to form spherical secondary particles with a diameter of 30'130' and a sedimentation volume of 4201111. Was. As shown in FIG. 1, this secondary particle has a thickness of about 2
The inside of the shell was filled with a low-density aggregate of xonotrite crystals, and there were no cavities.

This molded paulownia material was mixed with 4% by weight of alkali-resistant glass fiber based on the solid content, and then dehydrated and press-molded into 15 f3.
'C for 2 hours. The physical properties of the obtained molded body are shown in Table 1 together with the physical properties of the molded body according to a comparative example described below.

Comparative Example 1 The stirring speed during digestion was set to 44. Orpm and stirring time were changed to 1 hour, and the resulting viscosity was ', + I) Gino) type molded paulownia wood was produced in the same manner as in Example 1 using lime milk of cp.

The xonotrite crystal secondary particles in the obtained molding material have a diameter of 30 to l 3 Q /J and a sedimentation volume of 42. t)m
Although it was bulky, it was hollow as shown in Figure 4.

Comparative Example 2 A xonotrite-based molding material was produced in the same manner as in Example 1 using quicklime with a CaO crystal size of 0.41λ. Note that the viscosity of lime milk obtained by digestion of quicklime was Sep.

The xonotrite crystal secondary particles in the obtained molding material are i
! It was hollow, with a diameter of 3 f, l −1, '3 +', 1 /J, and a sedimentation volume of 23 +, 'l + n l.

Table 1 Examples Immediate U-ru side bulk density (B7cm3) 0.11)1 0.101.1
0. ] (13 bending strength H7c+112) 3.
8 3. G OJ Netsuden #1 (Kcall+nl+'C)
0. (, +31 0,038 0.f', +39 Shrinkage rate (%) by firing 1.5t) 1.52 1.9
3 x firing strip 1! l-: I o 00 c, 24 hours

[Brief explanation of the drawing]

1 to 3 2 Electron micrographs showing cross sections of xonotrite crystal aggregate trees in examples of the present invention (magnifications are as shown in FIG. 1 and U2). Figure 3 or 4
0 +l [, 1x) Figure 1: Electron micrograph showing the cross section of a xonotrite crystal aggregate in a conventional xonotrite-based molded paulownia material °L (magnification 50 +, +x)

Claims (1)

[Claims] In a molding material consisting of an aqueous slurry of spherical particles that are an aggregate of Zono Ilite T1-like crystals, the above-mentioned spherical ladle has a lα diameter of 10.-15t, l/J, and 11 shift-like crystals. A thin shell formed by a dense collection of Schiff 1 Rei ltl-like crystals 1 filling the inside of the shell.
A xonotrite-based molding jAJA characterized by having a sedimentation volume of 3 fl fl ml or more due to its high density consisting of aggregate trees.