JP2003342052A - Mineral hardened body and method for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize such a new measure to deal with a water-based paint liquid waste that is capable of decreasing a burden to deal with the water-based paint liquid waste and of striving the zero-emission in the factory and so on. <P>SOLUTION: The mineral hardened body is a hardened body of a mixture mainly consisting of a water-based paint liquid waste and a scrap powder of cement set bodies. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The invention of this application relates to an inorganic cured product and a method for producing the same. More specifically, the invention of this application relates to a new inorganic hardened material which can be reused for a waste liquid of a coating material and a waste material of a hardened cemented material, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, the disposal of coating materials using organic resins has been a major issue. In recent years, waste liquid treatment has also become a problem in acrylic emulsion and latex emulsion water-based paints, which have been drawing attention as reducing the use of organic solvents. This water-based paint is characterized by the fact that when water evaporates, the resin components combine to form a film, but since the resin component is emulsified, the presence of resin emulsion particles makes it difficult to dispose of it. There is.

Therefore, conventionally, when disposing an aqueous paint in which such a resin is emulsified, a chemical treatment such as destruction of emulsion particles by addition of acid or alkali and separation by addition of a coagulant is carried out, or directly. The method of incineration has been adopted.

[0004]

However, in the case of the conventional chemical treatment, the effect of the chemical addition is incomplete when the resin concentration of the waste liquid is high, so it is necessary to dilute the concentration to less than 5%. For example, 2 liquids from the painting booth in the factory
There is a problem that the dilution is very burdened even when considering that the concentration is as high as 0% or more. On the other hand, in the case of direct incineration treatment, there is a problem of nozzle clogging and the clogging of filters, pipes, etc. due to the resin component in the storage tank. Since exhaust gas regulations are tightened for incineration, there is a problem in that the number of processing companies is limited and the cost becomes a heavy burden.

In view of the conventional problems as described above, the invention of this application provides a new water-based paint waste liquid capable of reducing the processing load of the water-based paint waste liquid and achieving zero emission in factories and the like. The challenge is to implement processing measures.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention of the present application is, firstly, to be a cured product of a mixture mainly composed of an aqueous paint waste liquid and a cement hardened waste powder. Provided is a characteristic inorganic cured product.

With respect to this inorganic hardened material, secondly, the invention of this application provides an inorganic hardened material characterized in that the cement hardened material waste material powder is a waste material powder of an autoclave-cured cement hardened material. Thirdly, the cement hardened body waste material powder has a particle size of 25 to 325 mesh (JIS standard) in a proportion of 70 to 100% by weight. Is an inorganic hardened material, characterized in that the mixing ratio of the water-based paint waste liquid (P) and the cement hardened material waste material powder (C) is 0.7 to 1.2 in terms of P / C weight ratio. Fifthly, the aqueous coating liquid waste solution provides an inorganic cured body, which has a resin solid content concentration of 10 to 40% by weight.

The sixth aspect of the present invention is the method for producing an inorganic hardened body as described above, wherein the pH at the time of mixing the aqueous paint waste liquid and the hardened cement waste material powder is 10 or more. A seventh aspect of the present invention provides a method for producing an inorganic hardened body, and a seventh aspect provides a method for producing an inorganic hardened body, which comprises heating and curing the mixture.

As described above, the invention of this application focuses on the characteristics of the hardened cement, which is widely used as a building material such as roofing materials and outer wall materials for which reuse of the water-based paint waste liquid is required to be promoted. Due to this characteristic, it has been completed based on the new finding that both the water-based paint waste liquid and the cement hardened material waste material can be reused.

That is, the waste material of the hardened cement material has a specific surface area increased in a powder state such as a crushed material or cutting powder, and further, has an uncured component activated to have hydraulic properties. It has a large content of polyvalent ions such as ions, and has the property of exhibiting the ability to break the emulsion when mixed with water.

Due to this characteristic, the mixture with the water-based paint waste liquid is hardened in the same manner as the resin mortar and the resin paste, and the bonding force of the resin component is also added to obtain a very hard solidified product.

[0012] The solidified inorganic hardened material thus obtained can be reused as a building material, a civil engineering material or the like.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the invention of this application having the above-mentioned features will be described below.

First, regarding the target water-based paint waste liquid,
This may be a waste liquid of various water-based paints, such as conventionally known ones, as long as it forms a film by binding resin components when water evaporates, such as acrylic emulsion and latex emulsion. Further, the waste liquid may be from various sources such as a liquid having a relatively high solid content from a coating booth in a factory to a liquid having a high solid content.

Regarding the cement hardened material waste powder to be mixed with the water-based paint waste liquid, waste materials such as building materials having various compositions mainly composed of cement components and other inorganic components such as aggregates and reinforcing fiber components are used. A pulverized product or a powder (powder or granular material) such as cutting powder generated when processing these building materials is used.

[0016] As such a cement hardened material waste material powder, a hardened material waste material powder manufactured by autoclave curing is exemplified as one preferable example. This is because, in the case of an autoclave curing product, the strength of the inorganic cured product provided by the invention of this application is further increased by the characteristic crystals such as tobermorite.

Regarding the particle size of the waste powder, it is 25 when the size of the specific surface area and the activity of the uncured component are taken into consideration.
The proportion of 325 mesh (JIS standard) is preferably 50% by weight or more, and more preferably 70
The ratio is 100% by weight. If it is less than 50% by weight, the curing time of the mixture with the aqueous coating liquid waste solution becomes long, and the strength of the cured product is difficult to be practically sufficient.

Regarding the mixing of the water-based paint waste liquid and the cement hardened waste material powder, considering that the water content of the water-based paint waste liquid is approximately 50% by weight or more, the mixing ratio of both is the water-based paint waste liquid (P). As a weight ratio of the cement hardened body waste material powder (C), P / C is preferably 0.5 to 1.5, and more preferably P / C = 0.7 to 1.2. At this ratio, a cured product can be obtained by leaving it at room temperature within about 24 hours, and its strength will also be good.

Among them, it is considered that the concentration of the resin solid component in the water-based paint waste liquid is 5 to 50% by weight, and more preferably 10 to 40% by weight.

In the production of the cured product of the invention of this application, it is preferable that the pH at the time of mixing the waste liquid of the aqueous coating liquid waste and the waste powder of the hardened cement product is 10 or more. This is because it effectively breaks the emulsion in the water-based paint waste liquid and accelerates the curing reaction. Further, the mixture may be molded after kneading and hardened even when left at room temperature. In order to accelerate this curing to obtain a high-concentration cured product, it is also effective to heat a semi-cured product in a temperature range of, for example, 30 to 80 ° C.

In the inorganic hardened material provided by the invention of this application, the water-based paint waste liquid and the cement hardened material waste material powder are essential, but further other components may be added depending on the use and the required characteristics. It goes without saying that they may be added. For example, various components such as a pigment component and a curing accelerating component may be considered.

Therefore, how to show an embodiment will be described in more detail.

Of course, the invention is not limited to the following examples.

[0024]

Example As the waste liquid of the water-based paint, waste liquids of various concentrations of acrylic resin emulsion paint (manufactured by Dainippon Paint Co., Ltd.) were used. The hardened cement waste powder contains 50% by weight of cement and 5% by weight of pulp fiber as a solid-forming composition, and is cured by autoclave (165 ° C, 8%).
The crushed product of the cement hardened body for exterior material manufactured according to (Time) was used.

Both of the above were kneaded to obtain a cured product. The following evaluation was performed for this product. <Curability after 24 hours> Shiatsu: If you push it with your fingers and it doesn't collapse. Drop it: Does it fall from a height of 1 m onto the concrete floor and break?

A: No deformation or cracking occurred.

B: Slightly deformed or cracked.

C: Large deformation or cracking. <Water immersion opacity> Re-elution of the paint was visually confirmed after 3 days.

A: No turbidity and no re-elution.

B: Slightly cloudy and slightly re-eluted.

C: Turbidity occurs and redissolution occurs.

The evaluation results are shown in Tables 1 and 2.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

As described in detail above, according to the invention of the present application, a new water-based paint waste liquid capable of reducing the processing load of the water-based paint waste liquid, achieving zero emission in factories, and reusing the paint waste liquid It is possible to realize the processing countermeasure of.

Claims (7)

[Claims] 1. An inorganic hardened product, which is a hardened product of a mixture mainly comprising a water-based paint waste liquid and cement hardened waste powder. 2. The hardened inorganic material according to claim 1, wherein the hardened cemented material powder is a waste material powder of a hardened cement that has been aged in an autoclave. 3. The particle size of the cement hardened waste powder is
Ratio of 25 to 325 mesh (JIS standard) 70
% To 100% by weight of powder.
Or the inorganic cured product of 2. 4. The mixing ratio of the water-based paint waste liquid (P) and the cement hardened waste powder (C) is 0.7 to 1.
2. The inorganic cured body according to claim 1, which is 2. 5. The water-based paint waste liquid has a resin solid content concentration of 10
5 to 40% by weight.
One of the inorganic cured products. 6. The method for producing an inorganic hardened product according to claim 1, wherein the pH of the water-based paint waste liquid and the hardened cement hardened material powder at the time of mixing is set to 10 or more. A method for producing a cured product. 7. The method for producing an inorganic cured body according to claim 1, wherein the mixture is heated.