JPS5841760A - Fibrous hillebrandite and manufacture - 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 relates to a fibrous fillet prandite made of crystalline fillet prandite having a crystal length of 50 μm or more and a manufacturing method according to item 7.

Traditionally, asbestos has been a typical inorganic fiber, which has long fibers and is of high industrial significance, but natural Ki! It is predicted that it will be depleted in the future, and it has been suspected that it has been produced in recent years as a chemical substance, and has been designated as an environmental conservation Ueno 1 substance.
1. It has come to be considered a material that does not exist. Although plastic fibers and rock wool, which are generally known as inorganic fibers other than stone, are used as heat insulating materials, they are not necessarily versatile as fillers and reinforcing materials because of their poor alkali resistance. Although safe fibers have various excellent properties, they are also too expensive to be put into practical use as general-purpose industrial materials such as reinforcing materials and fillers.

10,000, Hirepu □ Landite is a silicic acid raw material and a calcareous thorn P
It is a substance that can be synthesized in a relatively small amount using ASVC,
Moreover, its raw materials are abundant in Japan and can be obtained at low cost.Its properties are that it is a mineral mainly composed of calcium silicate, so it has excellent lFr thermal properties, and has a 1a11 compatibility with water.
Several attempts have been made in the past to make fibers from synthetic materials with excellent I properties.

For example, in the ternary system of CaO-8101-H2O, alkali and other 11! ）lIlIIE1JIJYU and investigated temperature, pressure, time, composition, etc., but it was not possible to make a long fiber material.

At present, the industrially produced hylepsyndite has a crystal length of
It is a moldy substance with a microscopic degree of flocculation and has a major drawback of resistance to filtration.

The present inventors used a completely new hydrothermal synthesis technique in which calcium silicate hydrate, mainly containing calcium silicate hydrate, was added to hot alkaline water preset to high silver and high pressure to perform water synthesis. It was possible to obtain fibrous hireplandite, which is mainly composed of crystalline hirepshindite, in which most of the crystal lengths are 50 μm or more.

As a result of chemical analysis of this feather product, its chemical components were mostly a compound consisting of CaOg Sing @ HIO, its chemical composition formula was Ca1SiO^, and as a result of x+1III folding, it was fixed as hylepsyndite. Additionally, as a result of thermal analysis, it has better thermal stability than tobermorite, which is one of the typical calcium silicate materials on the market1, so it can be used as a heat insulating material and a heat resistant material, and has good r-permeability. Because of its bulk, the inventors discovered that it could be used as a filler for synthetic resin molded products and as a reinforcing material, leading to the completion of the present invention.

That is, the third invention of the present invention is a fibrous hylepsyndite which is composed of crystalline hylepsyndite with a crystal length of 50 μm or more.

! The invention of 1 and 2 involves adding calcium silicate hydrate to hot alkaline water preset at high temperature and high pressure to cause a hydrothermal reaction to produce fibrous crystalline finprandite.
#This is a method for producing fibrous finprandite as mold.

Here, the alkali of hot alkaline water refers to alkaline substances such as alkali metal hydroxides, sodium hydroxide, potassium hydroxide, etc., and an alkali concentration of 0.5 to 4 mo is sufficient.

Calcium silicate hydrate is a material used in concrete, mortar, and slurry that is cured by saturated vapor pressure at high temperatures and pressures.

Autoclave-cured aerated concrete, etc. CaO-8
101-Hρ system substance, the Cab/81 pseudomolar ratio of calcium silicate hydrate as a starting material is 1 to 3.
It is enough. The mixing ratio of hot alkaline water and calcium silicate hydrate as a starting material in the hydrothermal reaction system is arbitrary, but preferably about 10 parts by weight or more of hot alkaline water per 1 part by weight of calcium silicate hydrate. It is sufficient to use 100 parts by weight or more.

The hydrothermal reaction referred to in this invention refers to promoting the crystallization reaction at the saturated vapor pressure of hot alkaline water, and the temperature required to form fibrous hireplandite crystals is 200 to 200°C.
300°C is sufficient.

Completion of hydrothermal reaction 1l The fibrous hylepsyndite crystals, which are type II, are dispersed from the reaction tank as a slurry suspended in water, separated by P separation, etc., and the dried product is dissolved in water in the form of white powder or flakes. It is a fibrous substance that is permeable to harmful birds. As shown in the examples below, this fibrous material is extremely pure crystalline hireplandite and has excellent heat resistance and alkali resistance. Also, crystal length 5
Since it is a fibrous material with a diameter of 0 μm or more, it can also be used as a 5-filler with a cyclic effect, a protective carrier, a P filter material, an adsorbent, etc.

Hereinafter, it will be explained in more detail using examples according to the present invention.
The present invention is not limited to these examples. Note that certain conditions in the examples are as follows.

(Chemical components were determined in accordance with JIS R9011, a chemical analysis method for lime.

(27 #lf [Test method for rubber compounding agents JIBR R6220).

(3) Xmll ratio @@Cu, filter N1, tube voltage 30 KV, tube current 15 mA, full scale meter axooooeps, scanning speed constant at 2# degrees/min.

(4) Hydraulic thermal analysis The sample weight was 10 mg, the DTA range was ±1007 AV, and the heating rate was constant at 10° C./min.

Example 1゜+6- Autoclave with 2 innings of internal volume 1500aJK
Approximately 1/2 of the internal volume of the 2MoVj sodium hydroxide water moat enclosure
After putting it in and sealing it, heat it to 250℃. -10,000, white carbon (8i0. = 86% 132 parts by weight, slaked lime (Ca
A suspension of amorphous calcium silicate hydrate prepared by heating a mixture of 68 parts by weight (O=74%), 2 in CaO/810t molar ratio, and 1000 parts by weight of water at about 90°C for 5 hours [the above Pour about 1/4 of the internal volume into hot alkaline water using a pressure pump. The chemical components of the product of the present invention were kept for 5 hours in zsoc and reacted with water, cooled and the contents were extracted, washed with water and dried at 105±5°C.

The compositional formula and bulk density are shown in Table Is1, and the results of Xm1li analysis, differential thermal analysis, and scanning electron microscope observation are shown in Figures 1 to 3.The products of the present invention are shown in Table 1 and Figure 1. As is clear, the chemical composition was identified as hireprundite consisting of Ca18 IO6KB. As shown in Figure 2, the thermal behavior of the inventive product is such that the KIL thermal peak near 600°C is used as an electrode, and the deep sleep S due to dehydration is much smaller than that of tobermorite, making it an excellent property as a WIk-resistant material. It had a - As is clear from Figure 183, the crystalline shape of the product of the present invention is fibrous, with a length of 50 μm or more and an average length of 10 μm.
It was 0-.

The products of the present invention are thermosetting resins, thermosetting resin fillers, F
It was experimentally confirmed that the JL material could be used for -Cf.

Example 2 As a result of repeating Example 1 by substituting 4 sodium hydroxide aqueous solution i[2 to 2 mo/1 potassium hydroxide aqueous 111 [K], crystallinity with crystal ik 50 μm or more and average length 100 μm was obtained. Hireprandite was obtained.

The quality characteristics of the product of the present invention were similar to those of the product obtained in Example f11.

[Brief explanation of the drawing]

FIG. 1 is an XIm diffraction diagram of the product of the present invention, FIG. 92 is a differential thermal analysis diagram, and FIG. 3 is a microscopic photograph thereof. General applicant: Asahi Kasei Industries, Ltd. 9- Fig. 1 Hl ref' Rashidite rotational meridional angle Cuk (2e deQ) 2nd cause 5ri &('C)

Claims (1)

[Scope of Claims] 1. Fibrous hireprundite, which is 4I mold, consisting of crystalline hireprundite with a crystal length of 50 or more. 2. Alkali metal hydroxide membership degree O, which is preset at high temperature and high pressure. CaO/S to 4 mo/l of hot alkaline water
Calcium silicate hydrate with an IO@% ratio of 1.5 to 3 is added and subjected to a hydrothermal reaction under a saturated vapor pressure of 200-aoo c to produce fibrous crystalline fillerprandite. Method for producing fibrous finprandite