KR101666909B1 - Composition for stabilizing asbestos and treatment method for suppressing asbestos using the same - Google Patents

Abstract

The present invention relates to a treating composition for asbestos stabilization that can effectively chemically stabilize an asbestos by penetrating into a building material containing asbestos and prevent leakage or scattering of the asbestos to an external impact, and a method of stabilizing the asbestos using the same .
The treating composition for asbestos stabilization of the present invention is an alkali metal silicate selected from the group consisting of lithium silicate, sodium silicate, and potassium silicate; Silane compounds selected from the group consisting of dimethyldimethoxysilane, ethyltrimethoxysilane, methyltrimethoxysilane, and gamma-glycidyloxypropyltrimethoxysilane; Lead titanate, and lead zirconate; And water.

Description

TECHNICAL FIELD The present invention relates to an asbestos stabilizing treatment composition and a method of stabilizing asbestos using the same,

The present invention relates to a treating composition for stabilizing asbestos-containing building materials and a method for treating asbestos using the same.

More particularly, the present invention relates to a treatment composition for stabilizing asbestos, which can effectively stabilize the asbestos by penetrating effectively the building material containing asbestos and prevent the leakage or scattering of the asbestos against external impact, ≪ / RTI >

Korea has been using a lot of building materials containing asbestos in its architecture during the rapid modernization process. Asbestos is a mineral containing magnesium and silicon, and has long been in the limelight as a building material such as ceiling material, insulation material, sound insulation material, slate and so on since it is excellent in heat insulation, incombustibility, durability, insulation and price.

However, recently, it has been found that asbestos is a cause of many diseases such as asbestosis, lung cancer, and mesothelioma, and it is known that building materials containing asbestos can cause fatal harm to the human body. have.

However, since asbestos-containing building materials used in public structures such as subway, housing, and buildings such as subways are difficult to dispose of or dismantle from before regulation of asbestos use, asbestos contained in such building materials is leaked out over time, . Therefore, there is a need for a method of stabilizing asbestos that can prevent the scattering of asbestos without disposing or dismantling the asbestos-containing building material.

As a prior art related to the stabilization technology of asbestos, for example, Japanese Patent Registration No. 10-1364693 discloses a treatment method of melting asbestos waste material in a melting furnace and making it harmless. In the patent No. 10-1164500, Discloses a treatment method in which microwave is irradiated while being kept in a circular shape without being pulverized to modify the asbestos to render it harmless. However, the prior art has a disadvantage in that an expensive apparatus or device must be separately provided, and a complicated process and high cost are required.

A technique for stabilizing asbestos by a treating composition made of a chemical substance is also known. For example, Japanese Patent No. 10-1031861 discloses an asbestos scattering inhibitor containing a quaternary ammonium salt-supported nano-silica aqueous solution as a main component , Registration No. 10-0981944 discloses a method of coating an asbestos stabilizing solvent by applying a resin asbestos stabilizing solvent prepared by blending a resin coating on the surface of a building material, applying a flame retardant to the surface of the building material after drying the solvent, Which comprises applying a natural component antimicrobial deodorant to the surface of the asbestos.

However, none of these prior arts have the problem that the effect of preventing asbestos from scattering is not sufficient, and that the stabilizing effect is temporary and the asbestos stabilization effect is deteriorated continuously.

Among the building materials mainly used in Korea, the ceiling material is made of 15 ~ 18% of asbestos and 82 ~ 85% of cement, so that the structure of the surface is very dense and hard, Is very difficult. Therefore, a special penetrant is needed to solve this problem.

In order to effectively penetrate asbestos-containing building materials into asbestos-containing building materials and to continuously stabilize asbestos by asbestos processing agents, it is necessary to accurately determine the type and composition of asbestos used, It is necessary to derive.

However, asbestos is mainly used in Korea because it is composed of chrysotile (Baekseok-myeon, 3MgO · 2SiO ₂ · 2H ₂ O) collected from serpentine and croplandite (amphibole) collected from amphibole a _{cheongseokmyeon, Na 2 Fe (SiO 3)} 2 FeSiO 3 H 2 O), amorphous site (galseokmyeon, (FeMg) SiO _3). (MgFe) ₇ Si ₈ O ₂₂ (OH) ₂ ), tremolite (Ca ₂ Mg ₅ Si ₈ O ₂₂ (OH) ₂ ), actinolite (CaO ₃ (MgFe) O ₄ SiO ₂ ), But they are rarely used due to their low yield and their low value due to their weak fiber.

Karl Frank, "Asbestos ", Becker und Haag (1952); According to Dr.Myrij, C. Shaw, "Handbook of Asbestos Textiles" and Asbestos Texile Institute (1961), chrysotile asbestos has 37 to 44% of SiO _2, 39 to 44% of MgO, _{~6%, Fe 2 O 3 0.1~5.0} %, Al 2 O 3 0.2~1.5%, H 2 O and contains 12.0~15.0% of ingredient, chroman attempt Added asbestos (cheongseokmyeon) is SiO ₂ 49~53% By weight, MgO 0 to 3%, FeO 13 to 20%, Fe ₂ O _{3 17 to} 20%, H ₂ O _{2.5 to} 4.5% and Na ₂ O 4.0 to 8.5% Contains 49 to 53% of SiO ₂ , 1 to 7% of MgO, 34 to 44% of FeO, _{2 to} 9% of Al ₂ O ₃ , _{2 to} 5% of H ₂ O and 0.5 to 2.5% of CaO + Na ₂ O . The whitewashed surface contains a large amount of Mg, whereas the crystalline rock surface contains a large amount of Fe, and the brick surface contains a relatively large amount of Al and Fe.

It is necessary to develop a treating composition capable of effectively stabilizing asbestos and preventing it from scattering in consideration of kinds and components of such asbestos.

Accordingly, an object of the present invention is to provide a treatment composition for asbestos stabilization which can effectively stabilize asbestos contained in asbestos-containing building materials and can stabilize the stabilization effect, and a method for treating asbestos using the same.

The present inventors have found that by adding a silane compound together with an alkali metal silicate, the alkali metal silicate can be effectively penetrated into the asbestos containing building material, and also by cross-linking the alkali metal silicate and the polyvalent metal ion of the polyatomic donor by adding a polyatomic donor It has been found that asbestos-containing building materials can be chemically stabilized and also fillers can be added to supplement the insufficient ionic components in the asbestos and cross-link these ionic components with alkali metal silicates to chemically stabilize the asbestos-containing building materials.

As means for solving the problem of the present invention, the treating composition for asbestos stabilization of the present invention is an alkali metal silicate selected from the group consisting of lithium silicate, sodium silicate, and potassium silicate; Silane compounds selected from the group consisting of dimethyldimethoxysilane, ethyltrimethoxysilane, methyltrimethoxysilane, and gamma-glycidyloxypropyltrimethoxysilane; Lead titanate, and lead zirconate; And water.

In addition, the treatment composition for asbestos stabilization according to the present invention contains 50 to 80 parts by weight of an alkali metal silicate, 8 to 16 parts by weight of a silane compound, 2 to 8 parts by weight of a polyatomic donor, .

Also, the treating composition for asbestos stabilization of the present invention is characterized by further comprising a filler selected from the group consisting of wollastonite, talc, and kaolin.

The treatment composition for asbestos stabilization according to the present invention is characterized by containing 30 to 60 parts by weight of a filler based on 100 parts by weight of water.

The asbestos stabilization treatment method of the present invention includes a first step of applying and drying the treatment composition for asbestos stabilization of the present invention to an asbestos-containing building material; A second step of applying and drying an asbestos stabilizing treatment composition comprising silica sol added to an asbestos-containing building material; And a third step of applying and drying an inorganic pigment and a natural aromatic antibacterial / deodorant to asbestos-containing building materials.

According to the treatment composition for asbestos stabilization of the present invention, the alkali metal silicate is effectively penetrated into the asbestos-containing building material by adding the silane compound together with the alkali metal silicate, and the alkali metal ions of the alkali metal silicate are contained in the asbestos Ca, Mg, Al It is possible to chemically stabilize asbestos and prevent asbestos from scattering or leaking by causing a substitution reaction with metal ions such as. In addition, according to the treatment composition for asbestos stabilization of the present invention, the structure of the asbestos-containing building material can be chemically stabilized by cross-linking the alkali metal silicate and the polyvalent metal ion of the polyatomic donor by adding the polyatomic donor.

In addition, the treating composition for asbestos stabilization of the present invention can further stabilize the asbestos-containing building material by supplementing the insufficient ion component to the asbestos by cross-linking the ion component with the alkali metal silicate by further adding the filler.

According to the treating composition for asbestos stabilization of the present invention and the method for stabilizing asbestos using the same, not only the asbestos inherent in the building material can be effectively stabilized, but also the stabilizing effect of the asbestos is maintained by the chemical stabilization mechanism.

In addition, the structure of building materials can be made more robust, and asbestos does not leak or scatter even in an external impact, and the life of building materials can be extended.

1 is an electron micrograph of an asbestos-containing building material sample treated with the treating composition for asbestos stabilization according to the present invention.
2 is an electron micrograph of a sample of building material containing asbestos that has not undergone asbestos stabilization treatment.

The treating composition for asbestos stabilization of the present invention is an alkali metal silicate selected from the group consisting of lithium silicate, sodium silicate, and potassium silicate; Silane compounds selected from the group consisting of dimethyldimethoxysilane, ethyltrimethoxysilane, methyltrimethoxysilane, and gamma-glycidyloxypropyltrimethoxysilane; Lead titanate, and lead zirconate; And water.

The treatment composition for asbestos stabilization of the present invention comprises an alkali metal silicate (M ₂ O.SiO _2, wherein M is Li, Na, or K) selected from the group consisting of lithium silicate, sodium silicate, and potassium silicate , Alkali metal ions of alkali metal silicate cause substitution reaction with metal ions such as Ca, Mg and Al in the asbestos, thereby chemically stabilizing the asbestos and preventing scattering or leakage of asbestos.

The alkali metal silicate reacts with M ² O in the asbestos as follows in an aqueous solution to produce M ² Silicate and alkaline.

M ¹ ₂ SiO ₃ + M ² O + H ₂ O → M ² SiO ₃ + M ¹ OH

Since the ionization tendency of the metal M ¹ (Li, Na, K) is larger than M ² (Ca, Mg, Al), the above reaction utilizes that the ion substitution reaction proceeds to the right.

M ¹ (non-dissociated) + M ² (ion) → M ¹ (ion) + M ² (non-dissociated)

The alkali metal silicate in the asbestos stabilization treating composition is preferably contained in an amount of 50 to 80 parts by weight based on 100 parts by weight of water.

As the alkali metal silicate, it is preferable to use potassium silicate (K ₂ O.SiO ₂ ), and the mixing weight ratio of K ₂ O and SiO ₂ is preferably 1: 1.8 to 1: 3.5, and most preferably K ₂ O A potassium silicate consisting of 23.7 wt% and 76.3 wt% of SiO ₂ is used.

Further, the treating composition for asbestos stabilization of the present invention is characterized by adding a silane compound to effectively penetrate the alkali metal silicate into the building material containing asbestos.

The treatment composition for asbestos stabilization according to the present invention may contain at least one selected from the group consisting of dimethyl dimethoxy silane, ethyl trimethoxy silane, methyl trimethoxy silane gamma-glycidyloxypropyl trimethoxysilane gama-glycidyl oxypropyl trimethoxy silane), the alkali metal silicate can easily penetrate into the building material, and the stabilization effect of the asbestos can be further improved.

These silane compounds may be used in combination of two or more species to achieve the purpose of promoting penetration of alkali metal silicate, promoting stabilization of asbestos, and strengthening strength of building materials.

It is preferable that the silane compound in the treating composition for asbestos stabilization is contained in an amount of 8 to 16 parts by weight based on 100 parts by weight of water.

Further, the treatment composition for asbestos stabilization of the present invention comprises a polyatomic donor selected from the group consisting of lead titanate, and lead zirconate, thereby forming a polyvalent cross-linking of the silicate of the alkali metal silicate and the polyatomic donor As a result, the strength of the building material is increased and becomes strong, and the asbestos scattering and desorption are eliminated even in the external impact, so that the stabilization effect of the asbestos can be further improved. By including a polyatomic donor, water resistance and chemical resistance can be improved.

It is preferable that the polyatomic donor in the treating composition for asbestos stabilization is contained in an amount of 2 to 8 parts by weight based on 100 parts by weight of water.

In addition, the treating composition for asbestos stabilization of the present invention may further comprise a filler selected from the group consisting of wollastonite, talc, and kaolin. By incorporating a filler selected from the group consisting of wollastonite, talc, and kaolin, the metal ion of the filler acts as a more polyatomic donor to form a bridge with the silicate of the alkali metal silicate Whereby the stabilizing effect of the asbestos can be further improved.

CaSiO ₃ , talc (Mg ₃ Si ₄ O ₁₀ (OH) ₂ ), and kaolin (Al ₂ Si ₂ O ₅ (OH) ₄ ) are the fillers that supplement the unsaturated polyatomic donor in the asbestos. That is, wollastonite may supplement Ca, talc may be Mg, and kaolin may be supplemented with Al. As described above, the content of MgO, Al ₂ O ₃ , and CaO is small in the surface of the pearlite surface and the surface of the brass, and the content of Al ₂ O ₃ and CaO is small in the whitewasic surface. By additionally adding these metal oxides, It is possible to further improve the stabilizing effect of the asbestos by the formation of the asbestos. Therefore, in the present invention, by adding a filler, it is possible to greatly improve the stabilization effect of asbestos by replenishing donors that are insufficient in asbestos.

It is preferable that the filler in the treatment composition for asbestos stabilization is contained in an amount of 30 to 60 parts by weight based on 100 parts by weight of water.

In addition, the treating composition for asbestos stabilization of the present invention may further contain various additives such as anti-settling agents, defoaming agents, stabilizers, and flame retardants generally used in aqueous coating materials. It is preferable that the additive in the treatment composition for asbestos stabilization is contained in an amount of 2 to 8 parts by weight based on 100 parts by weight of water.

The asbestos stabilization treatment method of the present invention comprises an alkali metal silicate selected from the group consisting of lithium silicate, sodium silicate, and potassium silicate; Silane compounds selected from the group consisting of dimethyldimethoxysilane, ethyltrimethoxysilane, methyltrimethoxysilane, and gamma-glycidyloxypropyltrimethoxysilane; Lead titanate, and lead zirconate; And a filler selected from the group consisting of wollastonite, talc, and kaolin, to an asbestos-containing building material and drying the asbestos-containing building material; A second step of coating and drying the asbestos stabilizing treatment composition to which silica sol is added to the asbestos-containing building material; And a third step of applying and drying an inorganic pigment and a natural aromatic antiseptic and deodorant to the asbestos-containing building material.

In the first step, the above-described asbestos stabilizing treating composition is applied to the asbestos-containing building material to deeply penetrate the treating agent composition component into the building material, and MgO, Al ₂ O ₃ , CaO, FeO, Fe ₂ O ₃ And the metal ion of the alkali metal silicate causes the substitution reaction, the polyatomic donor forms the crosslinking with the alkali metal silicate, and the metal ion of the filler forms the crosslinking with the alkali metal silicate, And asbestos can be prevented from scattering or leaking.

In the second step, the treatment composition obtained by adding the silica sol to the above-mentioned asbestos stabilizing treatment composition is applied to the asbestos-containing building material subjected to the first treatment to further remove the unstabilized residual metal oxide Stabilize the inside of building materials while stabilizing, so that the asbestos does not leak or scatter further strengthened. By adding silica sol (SiO ₂ ) this can act as a binder and allow the interior of the building material to be more firmly fixed. It is preferable to add 25 to 50 parts by weight of silica sol based on 100 parts by weight of the treating composition for asbestos stabilization.

In the third step, the inorganic pigments and the natural aromatic antiseptic and deodorant are applied to the asbestos-containing building material which has undergone the first-stage treatment, thereby making it possible to distribute the moisture well, prevent the growth of fungi and bacteria, .

As the inorganic pigment, an inorganic pigment commonly used in general paints such as titanium oxide, iron oxide series (black yellow reddish brown), chromium oxide, ultramarine blue, and many other pigments may be used.

In the first to third steps of the asbestos stabilization treatment method of the present invention, the application may be carried out by using any known application means such as an atomizer or a roller applicator, and there is no particular limitation on the application method and means.

The coating amount of the first stage, it is preferable to apply a 300~400g / m ^2, the application amount of the second step, and is preferably coated with 300~400g / m ^2, the application amount of the third step is from 0.25 to 0.4 g / m < ² >.

Hereinafter, the treatment composition for asbestos stabilization and the asbestos stabilization treatment method according to the present invention will be described in more detail with reference to examples. However, the embodiments are illustrative of the embodiments of the present invention, and the technical scope of the present invention is not limited to the embodiments.

Example

60 parts by weight of potassium silicate as an alkali metal silicate, 12 parts by weight of dimethyldimethoxysilane as a silane compound, 6 parts by weight of lead titanate as a polyatomic donor, wollastonite, talc and kaolin as fillers were added in a total amount of 50 parts by weight And 4 parts by weight of polyalkanol Arnine as an additive were mixed and stirred to obtain a treating composition for asbestos stabilization.

The thus obtained composition for asbestos stabilization treatment was first applied to a sample of building material prepared in advance at 300 to 400 g / m < ² >, dried, and then 30 parts by weight of silica sol was added to the composition for asbestos stabilization. the second was coated to a 300~400g / m ² and dried, and then, coating the titanium oxide and the third directional antimicrobial deodorant to 0.3g / m ² and dried.

The stabilized building material samples through the above steps were tested for the amount of asbestos detected according to the indoor air quality process test standard (Ministry of Environment Notice No. 2010-24). In the test, only fibers having a length to diameter ratio of 3: 1 or more, a diameter of 0.25 占 퐉 or more, and a length of 5.0 占 퐉 or more were counted.

A sample of the building material to which the asbestos stabilizing treatment composition of the present invention was not applied was used as a control group. Three samples of the building material finished to the third application were applied, and one sample of the present invention subjected to the first application with the asbestos stabilizing treatment composition Respectively.

 Analyzed with a polarizing microscope, and components were analyzed with a component analyzer.

Sample classification Results (unit: structures / cc) Non-foaming sample 0.005 (white stone surface) Tertiary application sample 1 <0.002 Tertiary application sample 2 <0.002 Third Coating Sample 3 <0.002 Primary coating sample 1 <0.002

As a result of the test, the asbestos-containing building material subjected to the third coating treatment by the asbestos stabilization treatment method of the present invention was not substantially detected. Also, the asbestos-containing building material primarily coated with the treating composition for asbestos stabilization according to the present invention did not substantially detect asbestos. This demonstrates that the treating composition for asbestos stabilization according to the present invention shows remarkable effects even in one application do. On the other hand, the detection of the white stone surface was confirmed in the sample to which the treating composition for asbestos stabilization was not applied.

1 shows an electron microscope (3000 times) photograph of a sample coated with the treating composition for asbestos stabilization according to the present invention, and FIG. 2 shows an electron microscope (3000 times) photograph of a sample to which the treating composition for asbestos stabilization was applied . 1 and 2, it is confirmed that the interior of the asbestos-containing building material is chemically stabilized and solidified by treating with the treating composition for asbestos stabilization according to the present invention.

Since the asbestos can cause a serious harm to the human body and the environment even in a trace amount of scattering or leakage, the treating composition for asbestos stabilization of the present invention has an excellent effect on the stabilization of asbestos.

Claims (5)

Alkali metal silicates selected from the group consisting of lithium silicate, sodium silicate, and potassium silicate; Silane compounds selected from the group consisting of dimethyldimethoxysilane, ethyltrimethoxysilane, methyltrimethoxysilane, and gamma-glycidyloxypropyltrimethoxysilane; Lead titanate, and lead zirconate; Fillers selected from the group consisting of wollastonite and kaolin; And water. &Lt; / RTI &gt; The method according to claim 1,
Wherein the alkali metal silicate is contained in an amount of 50 to 80 parts by weight, the silane compound is contained in an amount of 8 to 16 parts by weight, the polyatomic donor is contained in 2 to 8 parts by weight, the filler is contained in an amount of 30 to 60 parts by weight Wherein the asbestos-stabilizing treating agent composition is applied to the asbestos-stabilizing treatment composition. delete delete A first step of applying and drying the treatment composition for asbestos stabilization according to claim 1 to a building material containing asbestos; A second step of coating and drying the asbestos stabilizing treatment composition to which silica sol is added to the asbestos-containing building material; And a third step of applying and drying an inorganic pigment and a natural aromatic aromatic deodorant to the asbestos-containing building material.

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