JPS5833183B2 - Manufacturing method of fibrous monolithic fireproof insulation material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a monolithic fire-resistant heat insulating material mainly made of fire-resistant fibers, particularly ceramic fibers.

Ceramic fiber has traditionally been used as a fireproof insulation material with low thermal conductivity and high spalling resistance.

Ceramic fibers are manufactured in bulk, blanket, paper, and board shapes, but they can also be poured or poured like conventional monolithic refractory insulation materials (lightweight castable refractories, lightweight plastic refractories, insulation mortar, etc.). A form that can be used in places where a construction method such as a stamp is required has not yet been developed.

Fireproof plastics using powdered fireproof aggregate, fireproof castables, fireproof mortars, fireproof spray materials, etc.
In the case of heat insulating materials, the viscosity suitable for the usage is mainly achieved by adjusting the amount of water added.

However, in a monolithic refractory heat insulating material using ceramic fibers as a refractory raw material, even if water is simply added to the ceramic fibers, the water permeates through the material, making it impossible to retain the desired amount of water.

Furthermore, even if ceramic fibers are dispersed in water, when the ceramic fibers are pulled up from the water, the water and the ceramic fibers separate, making it impossible to incorporate the desired water into the ceramic fibers.

Generally, when obtaining a fireproof heat insulating molded article using ceramic fibers, 5 to 2
Add fibers to 0 times the weight of water, with or without adding refractory powder, stir in water for several hours, and disperse uniformly in water.
A gelling agent such as colloidal alumina or colloidal silica is added to this to keep it in a dispersed state, a flocculant is added to agglomerate it, and dehydration molding is performed by compression molding, suction molding, etc.

In this method, if the amount of water relative to the fibers is small, the fibers will form aggregates and will not be uniformly dispersed.

Of course, the same applies when fibers are dispersed in a mixture of fireproof powder and water.

By appropriately squeezing the water from the fibers that have been coagulated by adding a coagulant as described above to retain the desired moisture content, it is possible to create a product with a viscosity suitable for use in fireproof castables, plastics, mortar, etc. It is possible.

However, when obtaining monolithic refractories using this method, it not only takes several hours as described above, but also requires water and gelling agents that are not needed for the product, and the flocculant used also causes loss. That cannot be imitated.

The present invention provides a method for manufacturing a fibrous monolithic fire-resistant heat insulating material in an extremely short period of time, using only the materials necessary for the product without waste.

In the present invention, a polyacrylamide-based polymer flocculant is directly added to ceramic fibers, kneaded, and then water is added and mixed to obtain a fibrous monolithic fire-resistant heat insulating material.

The ceramic fiber used in the present invention has a fiber length of 10
A length of approximately 0 mm or a length of approximately 5 to 1Q mm is used.

If the fiber length is longer than 1QQmm, not only will it be difficult to mix wires, but also it will be difficult to pour or apply with a trowel during use.

Furthermore, if the fiber length is too short, the bulk specific gravity after drying will increase, the heat insulation properties will decrease, and the purpose of using ceramic fibers will be diminished.

The polyacrylamide-based polymer flocculant may be added directly to the ceramic fibers as they are dry, or may be added to the ceramic fibers wetted with water.

This polymer flocculant can be used more effectively if it has as high a viscosity as possible.

The amount added depends on how the product is used and the length of the fiber.
Normally 0.1 to 100 parts by weight of ceramic fiber
10 parts by weight are used.

Depending on how the product is used, it may also be diluted with water.

Carboxymethylcellulose, methylcellulose, polyethylene oxide, triethanolamine, polyvinyl alcohol, starch, and the like are known as materials for imparting viscosity to monolithic refractories.

These have thickening properties, but when mixed with ceramic fibers, the fibers have poor dispersibility, the fibers become aggregated, and the product has poor elongation when used, and when pressure is applied to the mixed wire, the fibers may It has the disadvantage that water easily separates.

Polyacrylamide-based polymer flocculants do not have these drawbacks; the fibers are sufficiently dispersed even after a few minutes of hand kneading, they spread well during application, and the separation of fibers and water does not occur even when water is added. Instead, it is possible to perform plastic-like stamp construction, castable-like pouring with increased water, and even mortar-like construction with increased water.

Furthermore, the product thus obtained also has the feature of low drying shrinkage.

Furthermore, it is also possible to add various types of refractory aggregates to the dough-like or mortar-like product thus obtained to impart fire resistance, or to add an inorganic binder to impart strength at high temperatures. .

In this case, it is more effective to mix the refractory aggregate after completely dispersing the fibers, but it is also possible to mix the refractory aggregate with the fibers and add a flocculant. .

It is also more effective to disperse the fibers mechanically in advance.

Examples are shown below.

The dispersants in the above blending ratios were added to the fibers and mixed in a dry manner, and then water was added and kneaded by hand for 5 to 10 minutes.

In Example 5, after the fibers were sufficiently dispersed, synthetic mullite and colloidal silica were further added and mixed, and the viscosity was adjusted with water to obtain the following properties.

In Example 1, relatively short fibers were used and made into plastic, and in Comparative Example, OMO was used instead of the polymer flocculant in order to compare with Example 1.

Example 2 is an example in which relatively long fibers are used, Examples 3 and 4 are examples in which water is increased, and in 3, it is possible to pour, and in Example 4, it is possible to use a trowel as a mortar.

Example 5 contains refractory chamotte in order to increase strength and fire resistance.

In this way, the present invention adjusts the amount of water added to produce fire-resistant fibrous plastic refractories, as well as castable refractories.
Similarly, the fibrous monolithic fireproof insulation material, which can be widely used as mortar and coating material, can be easily produced in a few to 10 minutes without material loss. Can be done.

Claims (1)

[Claims] 1. A method for producing a fibrous monolithic fireproof insulation material, in which a polyacrylamide-based polymer flocculant is directly added to ceramic fibers, kneaded, and then water is added and mixed.