KR100378074B1 - Static-dissipative composition and panel manufactured therewith - Google Patents

Abstract

The present invention is to significantly improve the electrostatic dispersibility to show a uniform surface resistance, excellent strength and durability,

In an electrically conductive composition comprising a binder, a fast-hardening high-strength mixture, an inorganic mixture, a conductive material, a admixture, and a curing accelerator, the conductive material is 100 to 1000 µm in fine pulverization type. The present invention relates to an electroconductive composition for electrostatic dispersion and a panel manufactured using the same, wherein the pitch-based or pan-based carbon fiber is added in an amount of 0.1 to 20% by weight.

The electroconductive composition and panel of the present invention is excellent in the electrostatic dispersion effect and fluidity, excellent workability and does not require a separate finishing work can be used for various purposes as well as reducing the material cost by thin film construction.

Description

Electroconductive composition for electrostatic dispersion and a panel manufactured using the same {Static-dissipative composition and panel manufactured therewith}

The present invention relates to an electrically conductive composition and a panel manufactured using the same, and more particularly, to efficiently absorb and discharge various static electricity so that surface resistance can be reproducibly maintained within a certain range, and high strength. The present invention relates to an electrically conductive composition having durability and excellent workability and a panel manufactured using the same.

Conventionally, conductive vinyl tiles, conductive carpet tiles, conductive rubber mats, conductive organic coating agents, and the like have been used as an electrically conductive flooring material having excellent electrostatic dispersion effect. However, the flooring materials are poor in strength and durability, and easily damaged or deformed due to the carelessness of the operator when transporting or working with tools, and when the floorings are installed on the existing concrete floor, the flooring materials do not stably adhere to the concrete floor. The construction work was not easy due to the large number of partially lifted parts, and in the case of frequently cleaning the water, the phenomenon of lifting and peeling of the joint part occurred more frequently, resulting in costly maintenance.

In order to improve the above problems, research has been actively conducted on the mortar composition having excellent strength and durability as well as electrical conductivity. However, in most cases, carbon fiber used as a conductive material is not evenly dispersed, resulting in surface resistance. It did not appear uniformly, and there were disadvantages in that a crack was generated around the fibers which were not dispersed and aggregated so that the function as the electrically conductive flooring material was not properly exhibited.

Furthermore, in the case of the conductive composite disclosed in Patent Application No. 98-20949, a particulate carbon material and a fibrous carbon material were mixed, that is, the particulate carbon material having a particle size of 0.05 to 7.5 mm and the particle size were 2. After mixing the fiber type carbon material of ˜40 mm at a weight ratio of 100: 0.5 to 100: 140 and containing 5.5 to 107 parts by weight with respect to 100 parts by weight of the binder, the fluidity was weak and the surface finishing was not easy. There was a problem in that it is not formed to obtain a uniform surface resistance and beautiful exterior.

The present invention has been made to solve the above problems, the electrostatic dispersibility is significantly improved to show a uniform surface resistance, the electroconductive composition for electrostatic dispersion excellent in strength and durability and is prepared using the same The purpose is to provide a panel.

It is another object of the present invention to provide an electroconductive composition for electrostatic dispersion having self-leveling that provides excellent workability and does not require a separate finishing work by providing high fluidity and a panel manufactured using the same. It is done.

The above objects of the present invention are achieved by providing an electroconductive composition and panel for electrostatic dispersion using a milled type carbon fiber as a conductive material, the electroconductive composition and panel having only excellent electrostatic dispersion effect. Not only that, but also strength and durability.

In addition, with respect to the electroconductive composition for electrostatic dispersion, the composition consisting of an emulsified liquid polymer resin or a reemulsified powdered polymer resin, a fluidizing agent, an antifoaming agent, a thickener, an accelerator, and a retardant is added to exhibit high fluidity and thus a flat surface after construction. It can have a uniform surface resistance and can be constructed in a thin film form, so the workability is very good.

1 is a cross-sectional view of an electroconductive panel which is an embodiment of the present invention.

The present invention is 30 to 70% by weight of the binder, 20 to 60% by weight of the high-strength hard mixture, 1 to 30% by weight of the inorganic mixture, 0.1 to 20% by weight of the conductive material, 0.1 to 5% by weight of the admixture, a curing accelerator It relates to an electroconductive composition for electrostatic dispersion composed of 50 to 300 parts by weight of aggregate and 0.1 to 20 parts by weight of pigment, based on 100 parts by weight of the binder composition composed of 0.1 to 5% by weight.

Hereinafter, the configuration and operation of the electroconductive composition for electrostatic dispersion of the present invention in more detail.

The electroconductive composition for electrostatic dispersion of the present invention is composed of a binder, a mixture, a conductive material, a admixture, a curing accelerator, an aggregate, and a pigment.

In the practice of the present invention, the binder is 30 to 70% by weight of portland cement, white cement, mixed cement and the like.

In addition, 20-60 weight% and 1-30 weight% of fast-hardening high strength mixing materials and an inorganic mixing material are added to a mixture material, respectively.

At this time, as a fast-hard high-strength mixture material to promote the condensation and curing of the material to prevent shrinkage due to drying and curing, as well as to express high strength properties, such as calcium sulfo aluminate minerals or alumina minerals It is preferable to use, and the inorganic mixture which can improve the filling rate and reactivity of the material to improve the strength is at least one selected from the group consisting of fine silica powder, fine slag powder, fine powder calcium carbonate, fine powder fly ash, fine clay powder This is preferably used.

As the conductive material of the present invention, a pulverized carbon fiber of a pan-based or pitch-based carbon fiber is used, which has a length of 100 to 1000 µm and a diameter of 1 to ensure mixing efficiency and uniform dispersibility. It is preferable to use 0.1-20 weight% of fine grinding type carbon fibers of -10 micrometers pitch-type or fan type | system | group.

If the length of the carbon fiber exceeds 1000㎛ the dispersibility at the time of mixing of the material has a bad effect on the resistance and strength properties. In addition, when the carbon fiber content is less than 0.1% by weight, the surface resistance is not more than 10 ⁹ Ω, and it cannot be used as an electrically conductive material. When the carbon fiber content is more than 20% by weight, the surface resistance is lowered to less than 10 ⁴ 서, so that the reverse current Not only is there a danger, but the mixing of materials is difficult, resulting in construction problems and lowering of strength.

As such, the present invention enables the control of uniform surface resistance by improving the dispersibility of the conductive material using the finely divided carbon fiber, and improves the bending strength and the compressive strength due to the use of the fast-hardening high strength mixture. Strength and durability.

In addition, the admixture preferably contains 0.1 to 5% by weight of one or more selected from the group consisting of naphthalene-based, melamine-based, lignin-based or polycarboxylic acid-based fluidizing agents in order to improve dispersibility and workability of the material. .

In addition, in order to delay the initial rapid condensation to secure workability and to accelerate the curing reaction, a condensation delay type curing accelerator is used. Potassium fluoride (K ₂ SiF ₆ ), magnesium fluoride (MgSiF ₆ ), silicide 0.1 to 5% by weight of silicides such as sodium (Na ₂ SiF ₆ ) is added.

As aggregate, general sand and silica sand are used, and 50 to 300 parts by weight based on 100 parts by weight of the binder composition is used to improve strength, as well as to uniformly mix the products by improving the dispersibility of the fiber when mixing. It is preferable.

In addition to the above composition, a color may be imparted by adding a pigment according to a use, wherein the pigment is 0.1 to 20 weight parts of inorganic and organic pigments such as black, green, red, yellow, and blue based on 100 parts by weight of the binder composition. Use wealth

Preferably, the present invention is based on 100 parts by weight of the electroconductive composition for electrostatic dispersion, 1 to 20 parts by weight of an emulsified liquid polymer resin or a reemulsified powder polymer resin, 0.05 to 5 parts by weight of an antifoaming agent, and 0.01 to 2 parts by weight of a thickener. The addition is made by adding more, showing excellent electrical conductivity and excellent high fluidity, it is possible to thin-film construction by forming a flat surface after construction.

The polymer resin is an emulsified liquid resin or reemulsified powder resin mainly composed of acryl, ethylene vinyl acetate copolymer, polyvinyl alcohol, and the like, and is added to reinforce the bonding structure between the binder and aggregate formed by the hydration reaction. It represents the most preferable fluidity when added in 1 to 20 parts by weight based on 100 parts by weight of the electroconductive composition for electrostatic dispersion.

In addition, the antifoaming agent is to deflect or break the bubbles generated to beautify the finished surface finally formed, using a silicone-based antifoaming agent or an alcohol-based antifoaming agent having a low surface tension to excellent dissolution in water.

Thickener is added to increase the viscosity of the paste to improve flowability during construction to have self-leveling properties and to prevent bleeding and dry shrinkage cracking. It is preferable to use one or more selected from the group consisting of cellulose (HPMC), hydroxyethyl cellulose (HEC), starch, polyacrylamide.

The electroconductive composition for electrostatic dispersion of the present invention, in addition to the above additives, in order to improve the fluidity of the paste, accelerators such as potassium chloride, potassium hydroxide, sodium hydroxide, lithium carbonate, etc., which promote the coagulation of the paste, and citric acid and glue to delay the coagulation of the paste. Retardants such as sodium chorate, tartaric acid and the like may be added.

In addition, by further adding a calcium sulfo aluminate-based expansion material, it is possible to prevent cracking of the flooring material and to compact the tissue to prevent shrinkage.

The electrically conductive flooring composition provided with the high fluidity configured as described above exhibits excellent fluidity along with excellent conductivity, thereby making it possible to control uniform surface resistance by forming a flat surface after construction.

In addition, as another preferred embodiment of the present invention can be prepared an electroconductive panel for electrostatic dispersion consisting of 100 parts by weight of the electroconductive composition for electrostatic dispersion and 11 to 14 parts by weight of the blended water.

The manufacturing method of the electroconductive panel for the electrostatic dispersion is a step of mixing 100 parts by weight of the electroconductive composition and 11 to 14 parts by weight of the blended water, the step of pouring the mixture into the mold, and the casting is fixed by vibration molding Shaping into shape and size, air curing, steam curing or autoclaving curing the molding, and polishing the surface of the curing body.

At this time, in order to prevent shrinkage during drying of the electrically conductive panel and increase durability such as bending strength, the steel wire mesh may be manufactured by embedding steel wire mesh at 1/3 and 2/3 of the total thickness as shown in FIG. 1. In addition, the wire mesh may be used as a grounding point for floor construction.

In addition, in consideration of economical aspects in the formation of the conductive panel, the general cement mortar is filled up to 2/3 of the total thickness from the bottom surface, and only the remaining 1/3 is filled with the electroconductive composition for electrostatic dispersion in a slurry state mixed with water. It can manufacture.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the described embodiments.

Examples 1-4 and Comparative Examples 1-4

The compositions and contents of Examples 1 to 4 and Comparative Examples 1 to 4 are as shown in Table 1 below, and are prescribed in JIS R 5201 by pre-mixing a conductive material, a binder, a mixture, a admixture, an aggregate, and the like. Were mixed according to the "Physical Test Method of Cement".

(Unit: weight part) Example Comparative Example One 2 3 4 One 2 3 4 Carbon fiber milled (㎛) 0.5 2 1.5 One 0 0.05 0 1.5 6 mm 0 0 0 0 0.5 0 One 0 Portland cement 50 46 40 46 90 93.45 83 96.5 Fast hard high strength mixture 45 40 40 30 0 0 0 0 Inorganic mixture 3 10 15 20 9 5 15 0 Glidants 0.5 1.5 One 1.5 0.5 1.5 One 2 Fluoride flame One 0.5 2.5 1.5 0 0 0 0 sub Total 100 100 100 100 100 100 100 100 Kyu Sa 150 100 200 250 150 100 100 200 Fee 5 10 0.5 15 0 0 0 0 sub Total 155 110 200.5 265 150 100 100 200 water 40.8 35.7 48.08 54.75 42.5 36 36 51

The electroconductive compositions prepared according to Examples 1 to 4 and Comparative Examples 1 to 4 were molded into 4 × 4 × 16 cm molds according to JIS R 5201 to prepare specimens, and were cured under constant temperature and humidity conditions. Flexural strength and compressive strength were measured at ages 3, 7, 28 after curing.

The specimen for measuring the surface resistance is formed on the concrete floor of 120cm × 120cm size of the electroconductive composition prepared in Examples 1-4 and Comparative Examples 1-4 to 2cm thickness and then cured in the atmosphere and then aged Surface resistance was measured at 7 and 28 days by the method specified in ASTM F 150 "Standard Test Method for Electrical Resistance of Conductive Resilient Flooring".

As a result of the measurement, as shown in Table 2, the specimens prepared by Comparative Examples 1 to 4 generally had poor dispersibility and cracks occurred on the surface, whereas the specimens prepared by Examples 1 to 4 had dispersibility. It was excellent and the surface condition was good, the surface resistance was lower than the comparative example, the flexural strength, the compressive strength was very excellent.

In addition, the surface resistance, bending strength, compressive strength increased as the period after curing, and the specimen prepared by Example 4 shows the best results, it can be seen that Example 4 is the most preferable composition ratio.

Example Comparative Example One 2 3 4 One 2 3 4 Dispersibility Good Good Good Good Bad Good Bad Good Surface condition Good Good Good Good crack crack crack crack Surface resistance (Ω) 7 days 4 × 10 ⁸ 2 × 10 ⁶ 2 × 10 ⁷ 5 × 10 ⁷ 5 × 10 ⁹ 7 × 10 ¹⁰ 3 × 10 ⁸ 6 × 10 ⁸ 28 days 7 × 10 ⁶ 5 × 10 ⁵ 3 × 10 ⁷ 8 × 10 ⁷ 9 × 10 ¹⁰ 6 × 10 ¹¹ 2 × 10 ¹⁰ 5 × 10 ¹¹ Flexural strength (kgf / ㎠) 3 days 53 71 65 57 21 19 22 18 7 days 59 73 67 61 26 23 29 24 28 days 65 77 72 68 32 26 35 27 Compressive strength (kgf / ㎠) 3 days 451 496 534 510 154 126 121 102 7 days 491 524 579 552 206 175 162 125 28 days 528 554 596 575 282 264 243 224

Examples 5-8 and Comparative Examples 5-8

The composition of Examples 5 to 8 and Comparative Examples 5 to 8 and their contents for imparting high fluidity to the electrically conductive composition of Example 4 are shown in Table 3 below. The mixture was mixed according to the "physical test method for cement" specified in R 5201.

(Unit: parts by weight) Example Comparative Example 5 6 7 8 5 6 7 8 Electroconductive composition for electrostatic dispersion (Example 4) 100 100 100 100 100 100 100 100 Emulsion resin Liquid resin 0 3.6 0 3.6 0 0 1.2 18.0 Reemulsifying Powder Resin 1.8 0 1.8 0 0.8 8 0 0 Antifoam 0.2 0.2 0.2 0.2 0.2 0.4 0.2 0.4 Thickener 0.04 0.04 0.06 0.06 0.04 0.04 0.04 0.04 accelerant 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Retardant 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 sub Total 102.3 104.1 102.3 104.1 102.9 108.7 101.7 118.7 water 24.5 22.8 24.5 22.8 24.7 26.0 23.7 17.3

The conductive compositions prepared in Examples 5 to 8 and Comparative Examples 5 to 8 were molded into 4 × 4 × 16 cm molds according to JIS R 5201 to prepare specimens, and were cured under constant temperature and humidity conditions. Flexural strength and compressive strength were measured at age 7, 28 days after curing.

The specimen for measuring the surface resistance is formed on the concrete floor of 120cm × 120cm size of the electrically conductive composition prepared in Examples 5-8 and Comparative Examples 5-8 to 2cm thickness and then cured in the air and then aged Surface resistance was measured at 7 and 28 days by the method specified in ASTM F 150 "Standard Test Method for Electrical Resistance of Conductive Resilient Flooring".

As shown in Table 4 below, the specimens prepared by Comparative Examples 5 to 8 generally had poor dispersibility and cracks on the surface, whereas the specimens prepared by Examples 5 to 8 had dispersibility. It was excellent and the surface condition was good, the surface resistance was lower than the comparative example, flowability, flexural strength, compressive strength was very excellent.

In addition, the surface resistance, bending strength, and compressive strength increased as the curing period increased, and the specimens prepared in Examples 1 and 2 showed good results.

Example Comparative Example 5 6 7 8 5 6 7 8 Dispersibility Great Great Great Great Good Bad Good Bad Surface condition Good Good Good Good crack crack crack crack Flowability (mm) 211 209 201 203 213 186 211 184 Surface resistance (Ω) 7 days 3 × 10 ⁶ 2 × 10 ⁶ 3 × 10 ⁷ 4 × 10 ⁷ 2 × 10 ⁶ 3 × 10 ⁷ 4 × 10 ⁶ 8 × 10 ⁶ 28 days 7 × 10 ⁶ 5 × 10 ⁵ 7 × 10 ⁷ 8 × 10 ⁷ 5 × 10 ⁶ 8 × 10 ⁷ 7 × 10 ⁶ 5 × 10 ⁷ Flexural strength (kgf / ㎠) 7 days 54 53 56 54 26 58 29 24 28 days 71 67 72 68 32 26 35 27 Compressive strength (kgf / ㎠) 7 days 258 264 246 252 259 234 261 194 28 days 323 341 318 333 326 278 327 246

Table 5 below shows the most preferred compositions and contents of the electroconductive composition for electrostatic dispersion endowed with the present invention high fluidity.

(Unit: parts by weight) Classification ingredient Configuration Conductive material Carbon fiber 0.50 Binder Portland cement 27.00 Fast Hardness Calcium Sulfo Aluminate 10.00 Inorganic mixture Calcium carbonate 3.00 Glidants Melamine type fluidizing agent 1.00 Curing accelerator Fluoride flame 0.10 Aggregate Silica sand (0.6 mm or less) 50.00 Fee Pigment 5.00 Emulsion resin Reemulsifying Powder Resin 2.00 Antifoam Powder Defoamer 0.20 Thickener HPMC (cellulose thickener) 0.01 accelerant Lithium carbonate 0.05 Retardant Tartaric acid 0.20 Inflating material Inflatable Mix 1.00

Example 9

100 parts by weight of the highly conductive electrically conductive flooring composition prepared in Example 5 and 11 parts by weight of the blended water were mixed and poured into a mold, and the poured product was subjected to steam curing after vibration molding.

Example 10

100 parts by weight of the electroconductive composition and 12 parts by weight of the blended water were mixed and poured into a mold, and the poured product was autoclaved and cured after vibration molding.

Example 11

100 parts by weight of the electroconductive composition and 13 parts by weight of the blended water were mixed and poured into the mold, and the cured product was steam cured after vibration molding.

Example 12

100 parts by weight of the electroconductive composition for electrostatic dispersion prepared in Example 4 and 12 parts by weight of the blended water were mixed and poured into a mold, and the pour was vibrated and then air cured.

Comparative Example 9

100 parts by weight of the composition prepared in Comparative Example 5 and 10 parts by weight of the blended water were mixed and poured into a mold, and the poured product was subjected to steam curing after vibration molding.

Comparative Example 10

100 parts by weight of the composition prepared in Comparative Example 8 and 15 parts by weight of the blended water were mixed and poured into a mold, and the poured product was subjected to atmospheric curing after vibration molding.

Comparative Example 11

100 parts by weight of the composition prepared in Comparative Example 8 and 15 parts by weight of the blended water were mixed and poured into a mold, and the poured product was subjected to steam curing after vibration molding.

Table 6 below shows the manufacturing conditions of the panels prepared in Examples 9-11 and Comparative Examples 9-11.

(Unit: parts by weight) Example Comparative Example 9 10 11 9 10 11 Flooring composition Example 5 100 Example 8100 Example 8100 Comparative Example 5100 Comparative Example 8 100 Comparative Example 8 100 water 11 12 13 10 15 15 Curing condition Atmospheric curing ◎ Steam Curing ◎ ◎ ◎ ◎ Autoclave Curing ◎

The panels produced according to Examples 9-11 and Comparative Examples 9-11 were subjected to local compression and impact tests by measuring surface resistance, squareness and flatness in accordance with KS F 4760.

As a result of the measurement, as shown in Table 7 below, the panels manufactured according to Examples 9 to 11 were generally lower in surface resistance, squareness, and flatness than the panels prepared according to Comparative Examples 9 to 11. It shows strong resistance to local compression and no abnormality in impact test, indicating that it has excellent strength and durability.

Example Comparative Example 9 10 11 9 10 11 Surface resistance (Ω) 4 × 10 ⁵ 5 × 10 ⁵ 4 × 10 ⁵ 6 × 10 ⁸ 1 × 10 ⁷ 3 × 10 ⁷ Squareness 0.06% 0.05% 0.03% 0.09% 0.14% 0.11% Flatness (center) 0.7 mm 0.5 mm 0.6 mm 0.3 mm 3.2 mm 2.0 mm Local compression 1.2 mm 1.4 mm 0.8 mm damage 4.6 mm 5.7 mm Impact test clear clear clear damage clear offshoot

The electroconductive composition for electrostatic dispersion of the present invention and the panel manufactured by using the same are excellent in strength and durability so that the surface can be used as a flooring material as well as ensuring uniform surface resistance.

In addition, the present invention is excellent in fluidity and has excellent workability and self-horizontality that does not require a separate finishing work, so that a smooth surface can be formed after construction to have a uniform surface resistance. It is effective to reduce the cost.

Therefore, it can be used for various purposes in electronic parts production plants, computer rooms and laboratories handling precision parts and instruments, chemical plants handling flammable and explosive substances, gas stations and military weapons reservoirs, hospital operating rooms handling volatile gases, and LPG gas handling stations. Can be.

Claims (9)

In an electrically conductive composition comprising a binder, a fast-hardening high-strength mixture, an inorganic mixture, a conductive material, a admixture, and a curing accelerator, the conductive material is 100 to 1000 µm in fine pulverization type. Pitch-based or PAN-based carbon fibers of the conductive composition for electrostatic dispersion, characterized in that added to 0.1 to 20% by weight. The electroconductive composition for electrostatic dispersion according to claim 1, wherein 50 to 300 parts by weight of aggregate and 0.1 to 20 parts by weight of pigment are further added to 100 parts by weight of the electroconductive composition. According to claim 2, 1 to 20 parts by weight of an emulsified liquid polymer resin or reemulsified powdered polymer resin, 0.05 to 5 parts by weight of an antifoaming agent, and 0.01 to 2 parts by weight of a thickener are added to 100 parts by weight of the electrically conductive composition. Characterized in that it exhibits high fluidity. The electroconductive composition for electrostatic dispersion according to claim 1, wherein the fast-hard high-strength mixture is calcium sulfoaluminate mineral or alumina mineral and is added in an amount of 20 to 60 wt%. The method of claim 1, wherein the admixture is at least one selected from the group consisting of naphthalene-based, melamine-based, lignin-based or polycarboxylic acid-based fluidizing agent, the electrostatic dispersion characterized in that the addition of 0.1 to 5% by weight Electroconductive composition for. The electroconductive composition for electrostatic dispersion according to claim 1, wherein the curing accelerator is a silica fluoride salt and is added at 0.1 to 5 wt%. The electroconductive composition for electrostatic dispersion according to claim 3, wherein the antifoaming agent is a silicone antifoaming agent or an alcohol antifoaming agent. The method of claim 3, wherein the thickener is selected from the group consisting of hydroxypropylmethyl cellulose (HMC), hydroxyethyl cellulose (HEC), starch, polyacrylamide Electroconductive composition for electrostatic dispersion, characterized in that at least one. Mixing 100 parts by weight of the electroconductive composition of claim 2 or 11 with 11 to 14 parts by weight of the blended water, pouring the mixture into a mold, vibrating the pour, and molding the atmosphere. An electroconductive panel for electrostatic dispersion produced by curing, steam curing or autoclave curing and polishing the surface of the curing body.