JPS5841763A - Manufacturing of inorganic foam granule - 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 novel method for producing enhanced mineral foam particles.

Inorganic foam granules such as perlite, vermiki 4 light, and shirasu balloons are extremely porous and ultra-lightweight, so they have excellent properties such as trapping, heat insulation, nonflammability, sound absorption, water retention, and lightness. However, the major drawback is that the compressive strength of the individual particles is extremely weak. For this reason, there are many restrictions on the differences in heat insulating materials.

The present inventor has carried out extensive research into improving the strength, which is a drawback, while maintaining the original excellent properties of the above-mentioned inorganic foamed granules. The present invention was completed as a result of research into using foam granules as a versatile material as a heat insulating material. That is, the present invention comprises an aqueous liquid containing 0.1 to 10% by weight of an organic or inorganic aqueous binder, and an amount such that the weight ratio of water in the aqueous liquid to cement is 0.5 to 2.0. This method of producing inorganic foam particles coated with cement is characterized in that cement is mixed to form an inorganic foam granule, and the inorganic foam granules are kneaded with the inorganic foam granule.

The present invention will be explained in detail below.

In general, the reaction between water and cement is very slow, lasting up to several days.
It takes several dozen mortars. When coating the non-foamed granules with cement, the water absorbed in the inorganic foamed granules coats the outer shell and gradually undergoes a hydration reaction with the cement, gradually forming a stronger cement-coated shell. Form. At the early stage of the water utilization reaction, the cement in the outer shell and the water in the inorganic foam granules have not yet reacted, and the cement shell is very weak and easily peels off. Therefore, if any external force is applied during the period from the initial stage of this hydration reaction until the reaction is almost completed, due to handling or other external force, the cement coating will peel off and the objective cannot be achieved. The presence of the binder fixes the cicement shell to the outer shell of the inorganic foam granules and prevents it from peeling off even if external force is applied.

Therefore, it is necessary for the organic or inorganic binder to exist until the hydration reaction of the cement is completed and the cement shell is solidified with the outer shell of the inorganic foam granules. There is no problem even if it burns out or changes in quality when it is exposed to high temperatures in the subsequent drying process. It may be of any kind, and generally water-soluble ones are preferred, but it may be emulsified in water.

Examples of such materials include water glass, polyvinyl alcohol, and acrylic resin as water-soluble binders; examples of materials used in an emulsified state in water include vinyl acetate resin, asphalt, and synthetic rubber. (Hereinafter, the binder used in an emulsified state in water and the water-soluble binder may be collectively referred to as the aqueous binder, and the liquid may be abbreviated as the aqueous liquid).

The concentration of the binder in water is preferably 0.1 to 10% by weight in relation to the amount of water suitable for the water utilization reaction of the cement used, and if it is less than 0.1% by weight, it is necessary to bind the inorganic foam granular cement. This is not preferable because the amount of binder is less than the amount of binder.

The aqueous binder liquid and cement are mixed in such a manner that the weight ratio of water/cement in the aqueous liquid is 0.5 to 2.0. For ordinary Portland cement, the water/cement ratio is 1.0.
Although it is also preferable, it is appropriately selected within the above range depending on the type of cement.

Mixing a binder aqueous liquid and cement - To make a binder aqueous liquid, you can first make a binder aqueous liquid and then mix cement with this aqueous liquid, or you can mix water, binder and cement all at the same time. No problem.

There are no particular restrictions on the inorganic foam granules used in the present invention, as long as they are lightweight porous inorganic granules such as perlite, vermi+1ite, shirasu balloons, artificial lightweight aggregates, and blast furnace slag slag. However, perlite is the most common.

The amount of cement burst consisting of binder aqueous liquid and cement used is 120 to 30% per 1 m' of inorganic foam granules.
0 kg is preferable, 9 between 180 and 250 is particularly preferable, and when it is less than 9 between 120 and 9, the amount of cement to be coated is small,
Furthermore, since the amount of binder is insufficient, the strength of the inorganic foamed particles cannot be improved. On the other hand, if it exceeds 300 kg, the amount of cement increases and the lightweight properties of the inorganic foamed granules are impaired, and the degree of improvement in strength is small compared to the amount of cement, and the heat insulation properties are reduced, which is not preferable.

To knead the cement paste and the inorganic foam granules, the paste and the inorganic foam granules may be put into a suitable mixing device; The inorganic foam granules may be added at the same time. As a suitable mixing device, a mixer for concrete mixing etc. 6- can also be used, but a bag mill is preferred.

These cross-talk devices can uniformly coat the surface of the inorganic foam granules with cement, and in particular, a bag mill allows for continuous cross-crossing and mass production.

After a curing period of at least 3 to 10 days, the thus obtained cement-coated inorganic foam particles are manufactured into a product through a drying process at a drying temperature of 150° C. or higher.

Next, the present invention will be explained in more detail with reference to Examples.

Example 100 tons of water is heated to 90±5° C. with an electric heater in a water tank, and 7.5 kg of polyvinyl alcohol as a binder is added thereto and thoroughly stirred to completely dissolve.

100 tons of this polyvinyl alcohol aqueous solution and cement) 1
0'OKg and obsidian-based pearlite 1- as inorganic 7 foamed granules are charged into a bag mill. At this time, the feeding speed was 10z/m1ns of polyvinyl alcohol aqueous solution.Cement I
Q Q/fnin −/ξmirai 100 t/m
Cement coated pearlite is obtained by kneading for several minutes in a donkey rag mill.

This material was left stationary in a tank for 7 days for air curing.

After curing, leave it in hot air at 150°C for about 10 minutes to dry it and use it as a final product.

For the products of the present invention and for comparison, the binder was coated with Cemento paste without applying electricity/! #! - The strength of light and such unprocessed raw pearlite was investigated.

The strength can be determined from a diagram showing the relationship between the magnitude of the stress applied from above and the length of subsidence at the top level of the pearlite layer when a sample is filled in a pressure test container with an inner diameter of 50 tm and a height of 135 m. It is shown in the table below along with other quality characteristics.

Note 1) Stress value when the amount of settlement is 2.5- in the figure This result shows that the strength of the product of the present invention is more than 4 times higher than the raw material pearlite (more than 3 times on average for each amount of settlement). I understand.

[Brief explanation of the drawing]

The figure is a graph showing the relationship between the magnitude of stress 9 and the length of settlement. Patent attorney Akira Ito 9-

Claims (4)

[Claims] (1) 0.1 organic or inorganic aqueous pine, goo
The weight ratio of the aqueous liquid containing ~10% by weight and the moisture in the aqueous liquid to cement is 0.5 to 2. A method for producing inorganic foam granules coated with cement, characterized in that yeast is prepared by mixing a similar amount of cement with yeast, and the inorganic foam is kneaded with yeast. (2) The organic or inorganic binder is water glass, polyvinyl alcohol, acrylic resin, vinyl acetate resin,
The manufacturing method according to claim (1), which is a synthetic rubber. (3) The inorganic foam particles are perlite, permikilite,
The manufacturing method according to claim (1), which is a whitebait balloon, an artificial lightweight aggregate, and a blast furnace slag slag. (4) Claim (1) in which the paste used for kneading is 120 to 5ooKt for inorganic foam □ School closure 1-
Manufacturing method described in section