KR101477733B1 - Mineral Wool Fiber Composition having improved Bio-Solubility, And Mineral Wool - Google Patents

Abstract

The present invention provides a bioabsorbable mineral wool fiber composition and biodegradable mineral wool fibers that are more soluble in the physiological medium. More specifically, the total content of SiO ₂ and Al ₂ O ₃ is 45 to 67% by weight, the total content of CaO, MgO, Na ₂ O and K ₂ O is 20.1 to 50% A biodegradable mineral wool fiber composition having better thermal stability and physical properties and having better bioavailability, and biodegradable mineral wool fibers prepared using the same.

Description

(Mineral Wool Fiber Composition Having Improved Bio-Solubility, And Mineral Wool)

The present disclosure relates to biodegradable mineral wool fiber compositions and mineral wool fibers.

Ceramic fibers, especially mineral wool (Rock Wool / rock wool), are produced by melting silicate ores such as basalt and andesite with high heat at 1,500 ~ 1,700 ℃ and by using high- It is an artificial mineral fiber. Generally, a commonly-used conventional mineral wool is composed of 30 to 50 wt% of SiO ₂ , 5 to 20 wt% of Al ₂ O ₃ , 1 to 15 wt% of FeO + Fe ₂ O ₃ , 15 to 45 wt% of CaO, 20% by weight as a main component, and is excellent in heat insulation, fire retardancy and heat resistance, and is used for various purposes such as heat insulation, heat insulation, sound absorption and soundproofing. Conventionally, most studies have been made to make mineral wool products having higher heat resistance by increasing MgO and Fe ₂ O ₃ and minimizing alkaline metals in the above composition, but recently, microfibers of MMVF (Man-Made Vitreous Fibers) Discussion of the possibility that lung accumulation in the lungs over a long period of time through the respiratory tract may cause lung disease has begun to be discussed.

In general, there is no direct evidence that ceramic fibers are related to human disease, but there is a possibility that if the broken fibers are inhaled into the lungs by respiration, they accumulate and cause harm to the human body. However, by increasing the solubility in physiological media, it is possible to minimize the possibility of harm by discharging the accumulated fibers to the outside of the body. In addition to improving the biodegradability, it is necessary to have the basic characteristics of the existing mineral wool composition, that is, to be able to be fibrous, to have a heat resistance of 1000 to 1100 ° C during use, and to provide minerals having sufficient durability and heat insulation Research on wool composition has been actively conducted.

On the other hand, it is known that by decreasing the content of Al ₂ O ₃ , the KI (Numerical Index) value can be increased to increase the bio-solubility.

However, in Cupola furnace melting process using silicate-based ores inevitably containing Al ₂ O ₃ composition, there is a limit to increase the KI value, and it is inevitable that it is difficult to realize in reality. Accordingly, it is necessary to prepare ceramic fibers having increased water solubility and water resistance even when the Al ₂ O ₃ content is increased and the KI (Numerical Index) value is less than 30, sometimes less than 20.

It is an object of the present invention to develop a mineral wool fiber composition and a mineral wool fiber having characteristics that they are more effectively dissolved in body fluids and can be easily discharged to the outside of the body at the time of absorption into the body, thereby minimizing the effect on the human body.

In addition, Al ₂ O ₃ And an object of the present invention is to provide a mineral wool fiber composition and a mineral wool fiber excellent in bioavailability even if the KI value is low.

Further, the present invention provides a mineral wool fiber composition which is improved in heat resistance, water resistance, thermal conductivity, and restoring force by maintaining the conventional mineral wool fiber level and having a dissolution rate constant of 300 ng / cm 2. Hr or more by modifying the existing mineral wool fiber composition. There is a purpose.

The biodegradable mineral wool fiber composition according to the present invention comprises 45 to 67% by weight of the total content of SiO ₂ and Al ₂ O ₃ , 20.1 to 50% by weight of the total content of CaO, MgO, Na ₂ O and K ₂ O, . ≪ / RTI >

Also, it is preferable that 30 to 45 wt% of SiO ₂ , 15 to 22 wt% of Al ₂ O ₃ , 8 to 12 wt% of iron oxide (including at least one of FeO and Fe ₂ O ₃ ), 15 to 30 wt% of CaO, And 0.1 to 5% by weight of R ₂ O (including at least one of Na ₂ O and K ₂ O), based on the total weight of the composition.

Also, it may be a bioabsorbable mineral wool fiber composition comprising 17 to 20 wt% of Al ₂ O _{3 and} 1 to 2 wt% of R ₂ O (including at least one of Na ₂ O and K ₂ O).

Also, it may be a bioabsorbable mineral wool fiber composition in which the weight ratio of R ₂ O (including at least one of Na ₂ O and K ₂ O) / Al ₂ O ₃ is less than 0.5.

The present invention also relates to a bioabsorbable mineral wool fiber composition comprising SiO ₂ and Al ₂ O ₃ as essential components and containing at least _three of Fe ₂ O ₃ , CaO, MgO, Na ₂ O and K ₂ O, And a dissolution rate constant of 300 ng / cm < 2 > hr or more.

Further, the fiber-elongation may be a bioabsorbable mineral wool fiber composition having a difference between a temperature and a liquid temperature of 80 DEG C or higher.

Further, it may be a bioabsorbable mineral wool fiber composition having a water resistance of 0.8% or less.

In addition, SiO ₂ and Al ₂ O ₃ to contain the required and, as Fe ₂ O _3, FeO, CaO, MgO, Na ₂ O, and the raw solubility of mineral wool fiber composition that is more than three species included in a K ₂ O, Al ₂ O ₃ is not less than 10% by weight and the value (calculated as% by weight) of the formula (Na ₂ O + K ₂ O + CaO + MgO) - 2 × Al ₂ O ₃ is 20 or less, And a rate constant of 300 ng / cm < 2 > hr or more.

The bioabsorbable mineral wool fibers according to the present invention can be prepared using the bioabsorbable mineral wool fiber composition.

The biodegradable mineral wool composition according to the present invention and the biodegradable mineral wool fiber prepared by using the composition according to the present invention are improved in bioavailability with respect to artificial body fluid through modification and optimization of the composition and are easily dissolved and removed even when sucked into the lungs of the human body It can greatly reduce the harmfulness to the human body and has an excellent water resistance and is applicable to a conventional rotary process.

In addition, conventional ceramic fibers exhibiting biodegradation performance artificially lowered the content of Al ₂ O ₃ in order to increase the KI value, while the composition of the present invention is low in purity Al ₂ O ₃ It is advantageous that it can expand the range of raw materials to be used and reduce the cost of raw materials because it shows equivalent or superior biodegradation performance compared to existing products, while using low-cost raw materials to some extent. And it has excellent durability against water and exhibits lower liquid temperature and fiber elongation temperature (log? 3.0) than the conventional composition, saving the energy required for fiberization, thereby reducing cost.

Hereinafter, the bioabsorbable mineral wool fiber composition according to the present invention will be described in detail.

The present invention provides a bioabsorbable mineral wool fiber composition comprising at least three of SiO ₂ and Al ₂ O ₃ as essential components and at least one of Fe ₂ O ₃ , FeO, CaO, MgO, Na ₂ O, and K ₂ O .

The bio soluble mineral wool fiber composition contains 45 to 67% by weight of the total of SiO ₂ and Al ₂ O ₃ , 20.1 to 50% by weight of the total of CaO, MgO, Na ₂ O and K ₂ O, can do.

Wherein the bioabsorbable mineral wool fiber composition comprises 30 to 45 wt% of SiO ₂ , 15 to 22 wt% of Al ₂ O ₃ , 8 to 12 wt% of iron oxide (including at least one of FeO and Fe ₂ O ₃ ) 5 to 15 wt% of MgO, and 0.1 to 5 wt% of R ₂ O (including at least one of Na ₂ O and K ₂ O).

The present invention increases the alumina content of the existing mineral wool fibers without addition of other oxides such as P ₂ O ₅ and SO ₃ which improve the bio-solubility but cause other problems such as processability in the process, To a new biodegradable mineral wool fiber composition which increases bio-solubility without deteriorating physical properties such as heat resistance. The bioabsorbable mineral wool fiber composition according to the present invention will be described in more detail with reference to the constituents.

First, SiO _{2, which} is a main component of mineral wool fibers, functions as a network former forming a basic structure of glass, and preferably contains 30 to 45 wt% of the total fiber composition. If its content Is less than 30% by weight, the raw material cost rises due to the increase of AL ₂ O ₃ and alkaline earth metal oxide or alkali metal oxide, and the mechanical properties such as water resistance of the fiber thus produced are deteriorated. When it exceeds 45% by weight, Since the melt temperature and the fiber elongation viscosity temperature are increased, the prepared fiber has a large diameter and is difficult to be fiberized.

Adding the intermediate oxide is Al ₂ O ₃ having a water-resistance on the basis of the mesh forming the oxide in SiO _2, and the mesh size lowers the melting temperature into the make this form oxides mesh as a modification that can affect the properties of the free oxide R ₂ O (Na ₂ O, K ₂ O), RO (CaO, MgO) and the like can be added.

Al ₂ O _{3, which} is an intermediate-forming oxide, may be contained in an amount of 10 wt% or more and 30 wt% or less. And preferably 15 to 22% by weight. In particular, the Al ₂ O ₃ may be contained 17 to 20% by weight, Al ₂ O ₃ increases the viscosity of the glass melt near liquidus sikimyeo control the crystallization of the glass and increase the fiber resistance, in particular Al ₂ O The proper content of ₃ has a great influence on the biodegradability and heat resistance, so different composition and proper composition are required.

R ₂ O, which is a modified oxide in the fiber composition, acts as a melting agent that smoothly proceeds the melting when the glass is melted by the generation of oxygen in the glass. Where R ₂ O can be an alkali metal oxide. In one example there may be mentioned, such as Na ₂ O, K ₂ O. These two alkali metal oxides greatly increase the bio-solubility, but adversely affect the water resistance of the fibers and affect the shrinkage and recovery of the fibers. Therefore, it is preferable to use 0.1 to 5% by weight of Na ₂ O + K ₂ O in the fiber composition in view of bio-compatibility, water resistance and economical aspects. Especially 1 to 2% by weight. Also, the weight ratio of R ₂ O (including at least one of Na ₂ O and K ₂ O) / Al ₂ O ₃ may be less than 0.5. If it is 0.5 or more, the water resistance may be lowered.

RO, another modified oxide of the fiber composition, enhances the bio-compatibility of the produced fiber and reduces the viscosity of the glass melt, which is effective for fiberization. Where RO can be an alkaline earth metal oxide. Examples include CaO and MgO. And can also have an effect of improving the chemical durability degraded by the introduction of the alkali metal oxide. MgO reduces the temperature at which crystallization occurs and is more effective than CaO on bio-solubility. Such CaO and MgO may be used in an amount of 15 to 30% by weight and 5 to 15% by weight, respectively, of the fiber composition. Particularly, it is preferable that the mixed use amount of CaO and MgO is 20 to 45% by weight in the total composition. If the content is less than 20% by weight, the melting temperature is drastically increased. When the content is more than 45% by weight, And the crystallization temperature is decreased, so that the probability of crystal formation during the fiberization is increased, so that there is a problem that it is difficult to produce stable fibers.

The bioabsorbable mineral wool fiber composition satisfying the above composition can provide a bioabsorbable mineral wool fiber having a dissolution rate constant of not less than 300 ng / cm < 2 > hr.

Further, when the difference between the fiber-drawing viscosity temperature and the liquid-phase temperature is 80 DEG C or higher, it is possible to produce a stable fiber without any process problems such as crystallization of the spinner during fiberization.

In addition, when the content of Al ₂ O ₃ is 10 wt% or more and the value (calculated as% by weight) of the formula (Na ₂ O + K ₂ O + CaO + MgO) - 2 × Al ₂ O ₃ is 20 or less, The dissolution rate constant for the body fluid may be 300 ng / cm < 2 > hr or more.

The glass fiber according to the present invention can be applied to a conventional rotary process, and the bioabsorbable glass fiber according to the present invention thus prepared is modified without significantly changing the conventional composition, and the average fiber diameter of the fiber is 3 to 10 탆, And has high solubility and excellent water resistance.

Hereinafter, the present invention will be described in more detail with reference to Experimental Examples and Comparative Experimental Examples. However, the following experimental examples and comparative examples are given for the purpose of helping understanding of the present invention, and thus the scope of the present invention is not limited thereto.

Experimental Examples 1 to 6 and Comparative Experimental Examples 1 to 7

A mineral wool fiber composition having the same ingredients and contents as those in the following Table 2 (Experimental Example) and Table 3 (Comparative Experimental Example) was prepared, and the mineral wool fiber composition was melted in a smelter to produce a melt, (spinner) to produce fibers using a centrifugal force. The physical properties of the obtained glass fiber were measured by the following methods, and the results are shown in Tables 2 and 3.

1. Dissolution rate constant (K _dis )

In order to evaluate the solubility of the fibers prepared by the above Experimental Example and Comparative Experimental Example with body fluids, the dissolution rate constant of the artificial body fluid was determined as follows. The bioavailability of the glass fiber is evaluated on the basis of the solubility of the fiber in the artificial body fluid. After comparing the residence time based on the solubility, the dissolution rate constant (Kdis) is calculated using the following equation The results are shown in Tables 1 and 2 above.

&Quot; (1) "

_{K dis = [d o ρ (} 1 - M / M o) 0.5)] / 2t

In the above equation (1), d _o is the initial average fiber diameter, ρ is the initial density of the fiber, M _o is the mass of the initial fiber, M is the mass of the fiber remaining and t is the experimental time.

The content (g) of the composition component contained in 1 L of the artificial body fluid (Gamble solution) used for measuring the dissolution rate of the fiber is shown in Table 1 below.

Composition component Content (g / L) NaCl 7.120 MgCl ₂ 6H ₂ O 0.212 CaCl ₂ 2H ₂ O 0.029 Na ₂ SO 4 0.079 Na ₂ HPO 4 0.148 NaHCO ₃ 1.950 Na ₂ -tartrate · 2H ₂ O 0.180 Na ₃ C ₆ H ₅ O ₇ .2H ₂ O 0.152 90% Lactic Acid 0.156 H ₂ NCH ₂ COOH 0.118 C ₃ H ₃ O ₃ Na 0.172

The glass fibers of the Experimental Example and the Comparative Experimental Example were placed between thin layers between a 0.2 μm polycarbonate membrane filter fixed with a plastic filter support, and the dissolution rate was measured by filtering the artificial body fluid between the filters. During the experiment, the temperature of the artificial body fluid was adjusted to 37 ° C, the flow rate to 135 ml / day, and the pH was maintained at 4.5 ± 0.1 using HCl. In order to accurately measure the solubility of fibers occurring over a long period of time, artificial body fluids filtered at specific intervals (1, 4, 7, 11, 14, 21 days) were subjected to inductively coupled plasma analysis (ICP , Inductively Coupled Plasma Spectrometer), and then the dissolution rate constant (K _dis ) was calculated from the above formula (1).

2. Hot load temperature

Place a specimen of mineral wool pads into a heating vessel and place a load plate and a measuring rod adjusted to have a weight of 5 g per unit ㎠, and read and record the height of the tip of the measuring rod at room temperature on the scale. Next, the heating furnace is heated and the furnace temperature is measured by a thermocouple. The position of the thermocouple shall be the central part of the heating vessel in the vertical direction and 20 mm away from the outer surface of the heating vessel in the horizontal direction. The rate of heating and heating is set at about 5 ° C / min to a temperature about 200 ° C lower than the assumed value of the hot shrinkage temperature of the sample, and then about 3 ° C / min. Measure the temperature inside the furnace and the height of the front end of the measuring rod at intervals of 10 minutes from the start of heating. This is measured at 3-minute intervals near the supposition of the hot shrinkage temperature of the sample. In order to compensate the elongation of the measurement rod due to thermal expansion, a calibration curve is prepared by measuring elongation of the measuring rod relative to the furnace temperature in advance, and the position of the front end of the measuring rod is corrected accordingly.

The thickness shrinkage ratio is obtained by using the following equation (2).

&Quot; (2) "

Thickness shrinkage (%) =

A: Thickness of specimen (mm) when load plate and measuring rod are placed at room temperature.

B: thickness of sample during heating (mm)

The temperature at which the measured thickness shrinkage is 10% is measured to obtain the hot load temperature.

3. Thermal Shrinkage

(1) Slow heating method

In order to measure the thermal shrinkage of mineral wool fibers, fibers were prepared as pad type specimens and used in the experiment. First, 220 g of fiber was thoroughly spun in a 0.2% starch solution, poured into a 300 · 300 mm mold, the spun fibers were leveled, the surface deviation was reduced, and the pad was drained through the bottom of the mold. The pad was sufficiently dried for 24 hours or more in an oven at 100 ° C. and cut into a size of 100 × 100 × 25 mm to prepare a specimen. A measurement point was displayed using a material having sufficient heat resistance such as platinum or ceramics, The distance between the measuring points was closely measured using a near caliper. The pads were placed in a furnace, heated at 1000 占 폚 for 24 hours, and slowly cooled. The distance between the measured points of the cooled specimen was measured to compare the measurement results before and after the heat treatment, and the pre-shrinkage ratio was calculated using the following equation (3).

&Quot; (3) "

Hot-linear shrinkage _{(%) = (l 0 -l} 1) / l0 × 100

Where l ₀ is the initial distance (mm) between specimen marks, and l ₁ is the length (mm) between specimen marks after heating.

(2) Hot surface method

In order to measure the thermal shrinkage of mineral wool fibers, fibers were prepared as pad type specimens and used in the experiment. First, 220 g of fiber was thoroughly spun in a 0.2% starch solution, poured into a 300 · 300 mm mold, the spun fibers were leveled, the surface deviation was reduced, and the pad was drained through the bottom of the mold. The pad was sufficiently dried for 24 hours or more in an oven at 100 ° C. and cut into a size of 100 × 100 × 25 mm to prepare a specimen. A measurement point was displayed using a material having sufficient heat resistance such as platinum or ceramics, The distance between the measurement points was measured using a caliper, and the pads were placed in a furnace heated to 1000 DEG C, heated for 1 hour, and then cooled at room temperature. The distance between the measured points of the cooled specimen was measured to compare the measurement results before and after the heat treatment, and the linear contraction ratio was calculated using Equation (3).

4. Water resistance (%)

DGG weight loss method was used. In this method, 10 g of glass (360 ~ 400 ㎛) was boiled in 100 ml distilled water for 5 hours, and then rapidly cooled and filtered. The filtrate was dried at 150 ° C., The weight is measured and expressed as a percentage.

5. Liquidus temperature (℃)

The liquidus temperature can be defined as the maximum temperature at which crystals in the glass can be produced and measured according to ASTM C829-81.

6. Fiber stretching viscosity temperature (log? 3.0, ° C)

The fiber-drawing viscosity temperature is obtained by measuring the temperature at which the viscosity of the glass melt is approximately 1000 poise, and the fiberizing operation is performed near this temperature.

Component (% by weight) Experimental Example One 2 3 4 5 6 SiO ₂ 36.41 36.98 35.25 37.95 38.37 39.40 Al ₂ O ₃ 18.00 16.30 15.30 15.20 21.63 19.20 Fe ₂ O ₃ 8.60 11.60 8.85 9.40 10.10 7.30 CaO 24.25 24.10 20.50 28.30 15.90 16.80 MgO 7.48 5.90 14.80 6.05 8.90 12.40 Na ₂ O 3.80 4.12 3.40 1.30 3.10 2.30 K ₂ O 0.75 0.60 1.30 0.90 1.30 2.00 TiO ₂ 0.71 0.40 0.60 0.90 0.70 0.60 Dissolution rate constant (Kdis)
(ng / cm < 2 > hr) 390 372 417 312 305 307 Hot load temperature (℃) 696 687 666 688 697 685 Slow heating method 3.4    3.1 3.0 3.2 3.4 3.4 hot surface method 5.8 5.6 5.6 3.3 5.9 6.1 Water resistance (%) 0.55 0.68 0.69 0.69 0.43 0.39 Liquid temperature (℃) 1300 1297 1317 1302 1368 1358 Fiber stretching viscosity temperature
(log? 3.0) 1389 1379 1400 1386 1440 1420

Component (% by weight) Comparative Experimental Example One 2 3 4 5 6 7 SiO ₂ 45.30 48.6 33.97 35.74 39.74 38.12 36.48 Al ₂ O ₃ 14.70 17.51 15.88 15.38 23.42 18.24 17.38 Fe ₂ O ₃ 12.50 10.59 10.53 8.60 10.19 7.59 7.30 CaO 18.60 13.61 19.58 31.78 17.40 16.88 16.80 MgO 4.00 5.30 15.92 5.59 5.44 12.59 12.40 Na ₂ O 2.90 3.39 2.22 1.48 2.28 3.70 6.04 K ₂ O 1.20 0.60 1.33 0.74 1.22 2.40 3.00 TiO ₂ 0.80 0.40 0.57 0.69 0.31 0.48 0.60 Dissolution rate constant (Kdis)
(ng / cm < 2 > hr) 277 287 382 390 265 198 381 Hot load temperature (℃) 603 639 589 517 647 589 555 Slow heating method 4.2 2.0 6.9 6.9 4.1 5.4 6.9 hot surface method 7.2 3.2 8.9 8.5 7.4 8.8 10.4 Water resistance (%) 0.29 0.68 0.99 0.98 0.34 0.36 1.23 Liquid temperature (℃) 1300 1427 1255 1274 1448 1320 1310 Fiber stretching viscosity temperature
(log? 3.0) 1380 1470 1287 1285 1456 1400 1384

As shown in Experimental Examples 1 to 6 of Table 2, the KI Index value was as low as 20 or less in the composition range of the present invention, but the dissolution rate constant value was 300 ng / hr, more specifically, the dissolution rate constant value is in the range of 305 to 417 ng / cm < 2 > hr. This is breaking the framework of common sense that the value of KI Index should be above 30 to improve the bioavailability.

In Comparative Experimental Example 1, the content of SiO ₂ is rather high and the content of MgO is low, so that the solubility is relatively decreased.

In the case of Comparative Experiment 2 is high SiO ₂ content and the relative dissolution rates to help constant showed a relatively low dissolution rate constant value because of a reduced amount, such as CaO, a high SiO fiber elongation viscosity temperature due to the _second content Is increased. This is disadvantageous in that it can extend the service life of the spinner due to the low fiber drawing temperature and also lowers the possibility of crystal precipitation which may become a problem during the fiber production process, thereby enabling stable fiber production.

Comparative Experimental Examples 3 and 4 are mineral wool fiber compositions having low SiO ₂ and Al ₂ O ₃ contents and have a relatively high dissolution rate constant value. However, water resistance is lowered due to high RO and R ₂ O contents, It causes rise.

In Comparative Experimental Example 5, the content of Al ₂ O ₃ was 23.42 wt% and the solubility was drastically deteriorated. Also, the difference between the fiber drawing viscosity temperature (log? 3.0) and the liquid phase temperature may have an adverse effect on the isobaric process in which the glass composition is crystallized in the spinner at less than 80 占 폚, i.e., 8 占 폚.

In Comparative Experiment Example 6, the Fe ₂ O ₃ content is low and the solubility is drastically deteriorated due to the special conditions in which the content of R ₂ O exceeds 5 wt%.

In Comparative Experimental Example 7, R ₂ O / AL ₂ O ₃ > 0.5 was obtained in the mineral wool fiber composition, and the water resistance was drastically decreased.

The mineral wool fiber composition according to the present invention can appropriately change the content of each oxide to produce a fiber having excellent water solubility and water resistance without significantly changing the physical properties, and also has a fiber drawing viscosity temperature (log? 3.0) And the difference between the log η3.0 and the liquidus temperature in the fiberization temperature range is more than 80 ℃, so it is possible to produce safe fibers without any process problems such as crystallization of the spinner during fiberization.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

Claims (9)

45 to 67% by weight of the total content of SiO ₂ and Al ₂ O ₃ , 20.1 to 50% by weight of the total content of CaO, MgO, Na ₂ O and K ₂ O,
30 to 45 wt% of SiO ₂ , 15 to 22 wt% of Al ₂ O ₃ , 8 to 12 wt% of iron oxide (including at least one of FeO and Fe ₂ O ₃ ), 15 to 30 wt% of CaO, 5 to 15 wt% %, R ₂ O (containing at least one of Na ₂ O and K ₂ O) 0.1 to 5% by weight, based on the total weight of the mineral wool fibers. delete The method according to claim 1,
17 to 20% by weight of the Al ₂ O ₃ and 1 to 2% by weight of R ₂ O (including at least one of Na ₂ O and K ₂ O). The method according to claim 1,
Wherein the weight ratio of R ₂ O (including at least one of Na ₂ O and K ₂ O) / Al ₂ O ₃ is less than 0.5. The method according to claim 1,
Wherein the dissolution rate constant for the artificial body fluid is not less than 300 ng / cm < 2 > hr. The method according to claim 1,
Wherein the difference between the fiber-drawing viscosity temperature and the liquid-phase temperature is 80 占 폚 or higher. The method according to claim 1,
A water soluble mineral wool fiber composition having a water resistance of 0.8% or less. A biodegradable mineral wool fiber composition comprising essentially SiO ₂ and Al ₂ O ₃ and at least _three of Fe ₂ O ₃ , FeO, CaO, MgO, Na ₂ O, and K ₂ O,
17-20 wt% of Al ₂ O _3, 1-2 wt% of R ₂ O (including at least one of Na ₂ O and K ₂ O), the dissolution rate constant for an artificial body fluid is 300 ng / hr. < / RTI > A biodegradable mineral wool fiber produced using the bioabsorbable mineral wool fiber composition of any one of claims 1 to 8.