KR20210147819A - Composition of cement surface preparation compound for heat insulating material and Cement surface preparation compound for heat insulating material comprising the same - Google Patents

Abstract

The present invention relates to a cement-based base adjustment material composition for an insulation and a cement-based base adjustment material for the insulation comprising the same. Provided are the cement-based base adjustment material composition for the insulation that not only suppresses combustion compared to a cement-based base adjustment material that uses high usage amount of an existing organic material, but also reduces heat permeability; and the cement-based base adjustment material for the insulation comprising the same. The cement-based base adjustment material composition for the insulation comprises a cement, a blast furnace slag, a magnesium oxide, an expanded graphite with a particle size of 80-120 mesh, and an aggregate.

Description

Cement-based base adjusting material composition for heat insulating material and cement-based base adjusting material for heat insulating material comprising the same

The present invention relates to a cement-based background conditioning material composition for an insulating material and a cement-based background conditioning material for an insulating material comprising the same. It is possible to provide a background control material composition and a cement-based background control material for insulation comprising the same.

In general, in the wet exterior insulation method, a cement-based base adjustment material is installed on the top of the insulation surrounding the building envelope, and then a thin finishing material is plastered on the top.

The base control material acts as a protective layer of the insulator, and plays a role of suppressing heat transfer to the surface of the insulator in the event of a fire and a reinforcing body capable of suppressing deformation of the insulator. However, such a base control material has a problem in that the amount of organic material used is high, so that the combustion generation rate is high, and heat permeability is high.

Therefore, there is a need for a base control material capable of suppressing the spread of fire and reducing heat permeability when a fire occurs.

Republic of Korea Publication No. 10-2000-0017876 (2002.11.23)

An object of the present invention is to provide a cement-based background conditioning material composition for insulators capable of suppressing combustion, as well as reducing heat permeability, than a cement-based substrate conditioning material having a high usage of existing organic materials, and a cement-based substrate conditioning material for insulation including the same.

In order to solve the above problems, the present invention relates to a cement-based background conditioning material composition for insulation, comprising cement, blast furnace slag, magnesium oxide, expanded graphite having a particle size of 80 to 120 mesh, and aggregate.

In a preferred embodiment of the present invention, the background adjusting material composition of the present invention may further include a polyolefin powder resin.

In a preferred embodiment of the present invention, the ground conditioning material composition of the present invention may contain 114 to 171 parts by weight of blast furnace slag based on 100 parts by weight of cement.

In a preferred embodiment of the present invention, the background adjusting material composition of the present invention may contain 3.0 to 11.0 parts by weight of magnesium oxide based on 100 parts by weight of cement.

In a preferred embodiment of the present invention, the ground conditioning material composition of the present invention may contain 3.0 to 11.0 parts by weight of expanded graphite based on 100 parts by weight of cement.

In a preferred embodiment of the present invention, the background adjusting material composition of the present invention may contain 290 to 435 parts by weight of aggregate based on 100 parts by weight of cement.

In a preferred embodiment of the present invention, the background adjusting material composition of the present invention may contain 2.0 to 4.0 parts by weight of the polyolefin powder resin based on 100 parts by weight of the cement.

In a preferred embodiment of the present invention, the expanded graphite may have a carbon content of 97 to 100% by weight.

In a preferred embodiment of the present invention, the cement may include at least one selected from gypsum cement, blast furnace slag cement, and Portland cement.

In a preferred embodiment of the present invention, the aggregate may include silica sand having an average particle diameter of 0.15mm to 0.6mm.

In a preferred embodiment of the present invention, the polyolefin powder resin may include at least one selected from ethylene vinyl acetate (EVA) powder resin and low density polyethylene (LDPE) powder resin.

On the other hand, the present invention relates to a cement-based background adjusting material for a heat insulator, and includes the above-mentioned cement-based base adjusting material composition for an insulator.

In a preferred embodiment of the present invention, the cement-based background adjusting material for insulation of the present invention may have an adhesion strength of 1.6 to 2.4 N/mm 2 as measured by KS F 4716 regulations.

In a preferred embodiment of the present invention, the cement-based background adjusting material for insulation of the present invention may have a water absorption coefficient of ^{0.2 kg/m 2} h ^{0.5 or less when measured according to KS F 4716 regulations.}

In a preferred embodiment of the present invention, the cement-based background adjusting material for insulation of the present invention may have a heat/cool repetition strength of 1.3 to 2.1 N/mm 2 as measured by KS F 4716 regulations.

The cement-based background conditioning material composition for an insulating material of the present invention and the cement-based background conditioning material for an insulating material comprising the same use expanded graphite to create voids on the surface when a fire occurs, and use magnesium oxide to suppress heat release from the surface part due to moisture release. have.

In addition, the cement-based background conditioning material composition for an insulating material of the present invention and the cement-based background conditioning material for an insulating material comprising the same have excellent adhesion strength and hot/cold repetition strength, as well as a low water absorption coefficient, and show excellent results in fire responsiveness evaluation.

Hereinafter, the present invention will be described in more detail.

The cement-based background conditioning material composition for insulation of the present invention includes cement, blast furnace slag, magnesium oxide, expanded graphite and aggregate.

First, the cement of the present invention is not particularly limited, but includes at least one selected from lime cement, blast furnace lime cement, gypsum cement, magnesia cement, Portland cement, blast furnace slag cement, fly ash cement, and Portland pozzolan cement. and preferably, may include at least one selected from gypsum cement, blast furnace slag cement, and portland cement.

Portland cement (KS L 5201) is powdered by mixing raw materials including silica, aluminum, iron oxide and lime in an appropriate ratio as main components, and adding an appropriate amount of gypsum to clinker obtained by calcining this mixture. Types of Portland cement are divided into type 1 normal Portland cement, type 2 medium-melt heat Portland cement, type 3 crude steel portland cement, type 4 low heat Portland cement, and type 5 sulfate-resistant Portland cement, and in the present invention, each type of Portland cement is All cement can be applied.

Blast furnace slag cement (KS L 5210) is a cement in which blast furnace slag, a by-product of a steel mill, is added as a mixture to Portland cement. It has high late strength, low heat of hydration, and good chemical resistance and heat resistance.

Fly ash cement (KS L 5211) is a cement obtained by adding coal combustion ash from a thermal power plant as a mixture to Portland cement. reduce the quantity.

Portland pozzolan cement (silica cement) (KS L 5401) is a cement in which pozzolan is added as an admixture to Portland cement. It is strong against sulfate and has good watertightness and heat resistance. The pozzolan is volcanic ash, a weathered product of volcanic rock, and includes silicic acid, white clay, and a weathered product of limestone.

In addition, as the cement of the present invention, a fineness of 3,000 to 4,600 cm ³ /g, preferably 3,400 to 4,200 cm ³ /g, may be used.

Next, the blast furnace slag of the present invention is slag generated when pig iron is made from iron ore in a blast furnace, and impurities other than iron are collected. It is included in the composition to improve adhesion strength, and is manufactured by drying and pulverizing blast furnace crushed slag, and has high reactivity because it is vitrified by rapid cooling. Also, blast furnace glag can be divided into 1 type of blast furnace glag fine powder, 2 types of blast furnace glag fine powder, and 3 types of blast furnace glag fine powder according to the quality standard KS F 2563. It may include all of the species, two species, and three species, and may preferably include three species.

In addition, the blast furnace slag of the present invention may contain 114 to 171 parts by weight, preferably 128 to 157 parts by weight, and more preferably 135 to 150 parts by weight, based on 100 parts by weight of cement. If it contains less than parts by weight, there may be a problem of lowering of adhesion strength due to overexpansion due to insufficient chemical absorption of magnesium oxide having expandability. In order to compensate for this, when magnesium oxide, which is a stimulant, is increased, a problem due to reduced workability may additionally occur.

Next, the magnesium oxide of the present invention is a component capable of suppressing the heat release of the surface portion due to the release of moisture, and a white powder having a purity of 90% or more may be used. In addition, the magnesium oxide of the present invention may have a fineness of 4000 g/cm ³ or more, preferably 4000 ~ 10,000 g/cm ³ .

In addition, the magnesium oxide of the present invention may contain 3.0 to 11.0 parts by weight, preferably 6.0 to 9.0 parts by weight, more preferably 7.0 to 8.0 parts by weight, based on 100 parts by weight of cement, and if magnesium oxide is added to 3.0 parts by weight If it contains less than 1 part by weight, there may be a problem that not only the adhesion strength and the heat and cold repetition strength decrease, but also the water absorption coefficient exceeds the standard specification of KS F 4716, and if it exceeds 11.0 parts by weight, the adhesive strength and the heat and cold repetition strength decrease. There may be a problem.

Next, the expanded graphite of the present invention serves to suppress the transfer time of the flame when a fire occurs.

Expandable graphite can insert atoms or small molecules between the layers due to the layered structure of graphite. It refers to graphite whose particles expand hundreds of times as it separates.

In the expanded graphite of the present invention, the expansion gas may be sulfur, the expansion temperature may be 200 ~ 300 ℃, preferably 225 ~ 275 ℃, more preferably 237 ~ 263 ℃, the expansion rate is 350% by volume or less, preferably may be 100 to 200% by volume, more preferably 100 to 150% by volume.

In addition, the expanded graphite of the present invention may have a particle size of 80 to 120 mesh, preferably 90 to 110 mesh, more preferably 95 to 105 mesh, and if the particle size of the expanded graphite is less than 80 mesh, the particle size is There may be a problem that it is difficult to obtain uniform dispersibility because it is thick, and if it exceeds 120 mesh, the particles become thinner and there may be a problem that the price rises sharply.

In addition, the expanded graphite of the present invention may have a carbon content of 97 to 100% by weight, preferably 98 to 99.7% by weight, and more preferably 98.5 to 99.5% by weight.

In addition, the expanded graphite of the present invention may contain 3.0 to 11.0 parts by weight, preferably 6.0 to 9.0 parts by weight, more preferably 7.0 to 8.0 parts by weight, based on 100 parts by weight of cement, and if the expanded graphite is 3.0 parts by weight If it contains less than part, there may be a problem in that the ability to suppress combustion may be reduced, and if it exceeds 11.0 parts by weight, there may be a problem that not only the adhesion strength is lowered, but also the water absorption coefficient exceeds the standard specification of KS F 4716. .

Next, the aggregate of the present invention includes crushed stone, sand, gravel, and slag, which are present in rivers, forests, public waters, other ground, underground, etc., and coarse aggregate of 5 mm or more according to the average particle diameter of the aggregate. , can be divided into fine aggregates of 5 mm or less, the aggregate of the present invention can be used including aggregates having an average particle diameter of 0.15 mm to 0.6 mm, preferably 0.15 mm to 0.3 mm, preferably average Silica sand having a particle diameter of 0.15 mm to 0.6 mm, preferably 0.15 mm to 0.3 mm may be used. If the average particle diameter of the aggregate is less than 0.15mm, there may be a problem in workability due to reduced fluidity, and if it exceeds 0.6mm, there may be a problem during plastering of the surface portion.

In addition, the aggregate of the present invention may contain 290 to 435 parts by weight, preferably 326 to 400 parts by weight, more preferably 345 to 380 parts by weight, based on 100 parts by weight of cement, and if less than 290 parts by weight of the aggregate If it is included, there may be a problem of hardwood properties, and if it exceeds 435 parts by weight, there may be a problem of lowering adhesion strength and water resistance.

On the other hand, the cement-based background adjusting material composition for insulation of the present invention may further include a polyolefin powder resin.

The polyolefin powder resin of the present invention is an ethylene vinyl acetate (EVA) powder resin, a low density polyethylene (LDPE) powder resin, a very low density polyethylene powder resin, and a high vinyl acetate (high vinyl) resin. Acetate resin) may include one or more selected from among powdered resins, preferably ethylene vinyl acetate (EVA) powdered resin.

In addition, the polyolefin powder resin of the present invention may contain 2.0 to 4.0 parts by weight, preferably 1.8 to 2.2 parts by weight, more preferably 1.9 to 2.1 parts by weight, based on 100 parts by weight of cement, and if the polyolefin powder resin If it contains less than 2.0 parts by weight, there may be a problem of a decrease in water resistance and adhesion strength, and if it exceeds 4.0 parts by weight, there may be a problem of economic feasibility.

In addition, the cement-based background adjusting material composition for insulation of the present invention may further include a thickener.

The thickener of the present invention can have a moisturizing effect that adjusts the viscosity according to the construction situation, prevents rapid evaporation of moisture and keeps it constant.

The thickener of the present invention may include at least one selected from methyl cellulose, ethyl cellulose, and polysaccharide-based thickeners, and preferably methyl cellulose.

In addition, the cement-based background adjusting material composition for an insulating material of the present invention may further include water, preferably, 50 to 250 parts by weight, more preferably 100 to 200 parts by weight, based on 100 parts by weight of cement, but not limited

Furthermore, the cement-based background control material for heat insulators of the present invention includes the above-described cement-based background control material composition for heat insulators.

The cement-based base control material for insulation of the present invention is a fire-response type and can be used for external insulation.

The cement-based base adjuster for insulation of the present invention has an adhesive strength of 1.6 to 2.4 N/mm2, preferably 1.8 to 2.2 N/mm2, more preferably 1.9 to 2.1 N/mm2, measured according to KS F 4716. can have

In addition, the cement-based base adjusting material for insulation of the present invention is 0.2 kg/m ² h ^0.5 or less, preferably 0.05 to 0.15 kg/m ² h ^0.5 , more preferably 0.1 to 0.13 kg, when measured according to KS F 4716 regulations. It can have a water absorption coefficient of /m ² h ^0.5.

In addition, the cement-based base conditioning material for insulation of the present invention, when measured according to KS F 4716, 1.3 to 2.1 N/mm2, preferably 1.5 to 1.9 N/mm2, more preferably 1.6 to 1.8 N/mm2, repeated heating and cooling can have strength.

Hereinafter, the present invention will be described in more detail through examples, but the following examples are not intended to limit the scope of the present invention, which should be construed to aid understanding of the present invention.

Example 1: Preparation of cement-based base adjustment material for insulation

Based on 100 parts by weight of cement (Type 1 Portland cement, fineness: 3,800 cm ³ /g), 3 types of fine blast furnace slag powder (Youngjin Global, Type 3 blast furnace slag) 142.5 parts by weight, magnesium oxide (Yoryeongseong Dandong Heumyang Mining Group, 7.5 parts by weight of 90% pure magnesium oxide), 362.5 parts by weight of silica sand No. 7 as aggregate (particle size: 0.17 to 0.25 mm), 7.5 parts by weight of expanded graphite (Samjung C&G, ES 100 C 10, particle size: 100 mesh) and After mixing 2.75 parts by weight of ethylene vinyl acetate powder resin (Wacker Chemical, Vinnapas 4044), it is mixed at 100 rpm for 3 minutes. Then, after adding 162 parts by weight of water based on 100 parts by weight of cement, mixing was performed at low speed at 100 rpm for 1 minute, followed by stopping for 30 seconds. Finally, by high-speed mixing (mixing) at 500 rpm for 2 minutes again to prepare a cement-based base control material for the insulation material.

Examples 2 to 3, Comparative Examples 1 to 4

In the same manner as in Example 1 A cement-based base adjustment material for insulation was prepared. However, as shown in Table 1, by varying the content of the components, Examples 2 to 3 and Comparative Examples 1 to 4 were prepared cement-based ground conditioning materials for insulating materials.

Experimental Example 1: Measurement of physical properties of cement-based base adjustment material for insulation

The adhesion strength, water absorption coefficient, hot and cold repetition strength, and fire responsiveness evaluation of the cement-based base control material for insulation prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were measured according to the following method, and the results are shown in Table 2 below. shown in

1) Measurement of adhesion strength (N/㎟)

Adhesive strength was measured according to KS F 4716 for the manufactured cement-based background adjusting material for insulation.

2) Measurement of water absorption coefficient (kg/m ² h ^0.5 )

The water absorption coefficient was measured according to KS F 4716 for the manufactured cement-based base adjustment material for insulation.

3) Measurement of heat and cold repetition strength (N/㎟)

For the manufactured cement-based base adjustment material for insulation, the strength of repeated heating and cooling was measured according to KS F 4716.

4) Fire Response Evaluation

The fire flame test temperature was measured in the following way in order to proceed with the fire responsiveness evaluation of the manufactured cement-based base control material for insulation.

First, Styrofoam having a width of 15 cm, a length of 50 cm, and a thickness of 60 mm was attached to the outer wall of the building, and phenolic foam having a width of 15 cm, a length of 50 cm, and a thickness of 30 mm was attached to one side of the Styrofoam. After that, a glass fiber mesh was attached to one side of the phenolic foam, and the cement-based base control material for insulation prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was applied to one side of the phenolic foam to which the glass fiber mesh was attached to a thickness of 3 mm, respectively. Thus, a test specimen was prepared. A flame was prepared at a distance of 7 cm from the test body, and the flame emitted from the flame was sprayed on the test body for 15 minutes, and a thermocouple was installed to measure the temperature change due to the fire source. A gas torch was used as the fire source, and a fire source having a flame temperature of 700 ° C. was used. For the thermocouple, a K-type thermocouple was used, and they were installed 30 mm and 60 mm apart from the surface of the specimen in the direction of the outer wall of the building, respectively.

As can be seen in Table 2, in comparison with the cement-based base adjusting material for insulation prepared in Examples 1 to 3, the cement-based base adjusting material for insulating material prepared in Comparative Example 1 had lower adhesive strength and heat and cold repetition strength, and Comparative Example 3 It was confirmed that the cement-based base adjustment material for insulation manufactured in KS F 4716 not only significantly lowered the adhesion strength and heat and cold repetition strength, but also had a water absorption coefficient exceeding the standard ^{of 0.2 kg/m 2} h ^{0.5 or less of KS F 4716.}

In addition, compared with the cement-based base adjusting material for insulating materials prepared in Examples 1 to 3, the cement-based base adjusting material for insulating materials prepared in Comparative Example 2 had lower adhesion strength and a water absorption coefficient of 0.2 or less of KS F 4716. It could be confirmed that the amount of heat passing through the flame of the cement-based base control material for insulation prepared in Comparative Example 4 increased, and thus it was confirmed that the thermal decomposition temperature of the Styrofoam was increased to 450° C. or higher.

Claims (10)

Cement-based background adjusting material composition for insulation, characterized in that it contains cement, blast furnace slag, magnesium oxide, expanded graphite having a particle size of 80 to 120 mesh, and aggregate.
According to claim 1,
The background conditioning material composition is a cement-based background conditioning material composition for insulation, characterized in that it further comprises a polyolefin powder resin.
According to claim 1,
The background control material composition for an insulating material, characterized in that it comprises 114 to 171 parts by weight of blast furnace slag, 3.0 to 11.0 parts by weight of magnesium oxide, 3.0 to 11.0 parts by weight of expanded graphite, and 290 to 435 parts by weight of aggregate, based on 100 parts by weight of cement. A cement-based background adjusting material composition.
3. The method of claim 2,
The background conditioning material composition is based on 100 parts by weight of cement, polyolefin powder resin, characterized in that it comprises 2.0 to 4.0 parts by weight of a cement-based background conditioning material composition for insulation.
According to claim 1,
The expanded graphite has a carbon content (carbon content) of 97 to 100% by weight of the cement-based base material composition for insulation.
According to claim 1,
Wherein the cement comprises at least one selected from gypsum cement, blast furnace slag cement and Portland cement.
According to claim 1,
The aggregate is a cement-based background conditioning material composition for insulation, characterized in that it comprises silica sand having an average particle diameter of 0.15 mm to 0.6 mm.
3. The method of claim 2,
The polyolefin powder resin is an ethylene vinyl acetate (EVA) powder resin and low density polyethylene (LDPE) powder resin, characterized in that it comprises at least one selected from the group consisting of a cement-based base material composition for insulation.
[Claim 9] A cement-based background adjustment material for insulation, comprising the cement-based background adjustment material composition for insulation according to any one of claims 1 to 8.
10. The method of claim 9,
The cement-based base adjustment material for insulation has an adhesive strength of 1.6 ~ 2.4 N/㎟ when measured according to KS F 4716 regulations,
When measured according to KS F 4716, it has a water absorption coefficient of ^{0.2 kg/m 2} h ^{0.5 or less,}
When measured according to KS F 4716, a cement-based base adjuster for insulation, characterized in that it has a heat/cool cycle strength of 1.3 ~ 2.1 N/㎟.