KR20170007566A - Composition for preparing low dust mineral wool fiber and mineral wool fiber prepared therefrom - Google Patents

Abstract

The present invention relates to a composition for the production of low dust mineral wool fibers and mineral wool fibers produced therefrom. More particularly, the present invention relates to a composition for producing low dust mineral wool fibers, Dust-less mineral wool fibers capable of securing insulation, non-burning performance and low thermal conductivity, and mineral wool fibers produced therefrom.

Description

TECHNICAL FIELD The present invention relates to a composition for preparing low dust mineral wool fibers and a mineral wool fiber prepared from the same,

The present invention relates to a composition for producing low dust mineral wool fibers and mineral wool fibers prepared therefrom.

Mineral wool usually has properties such as high heat resistance, water resistance, and low thermal conductivity. Therefore, in a high temperature environment such as fire, mineral wool acts as a heat insulating material to prevent diffusion of heat, and it is possible to save energy required for insulation due to heat resistance and low thermal conductivity. In addition, when the external moisture penetrates into the mineral wool, the most important property, that is, the insulation property, can be lowered. Therefore, how effectively the external moisture can be blocked is also one of the important physical properties.

However, since the fiber diameter of the mineral wool is very small as 4 to 6 占 퐉, there is a problem that dust may be generated when processing or constructing and there is a problem that it causes burning to the workers.

Korean Patent Application No. 2013-0006042 discloses a technique for suppressing the generation of dust in mineral wool by bonding mineral wool and glass paper to one side of a wool board bonded with wood fiber and cement by an inorganic binder, So that additional work is required. In the case of using the mineral wool alone, the conventional problems still exist.

Therefore, it is required to develop a technique for improving the quality and workability of mineral wool by solving the problems of dust and staining while maintaining the favorable characteristics of the prior art and using the mineral wool alone.

The present invention relates to a composition for the production of a low-dust mineral wool fiber capable of securing the same heat resistance, thermal insulation, fire-retardant performance and low thermal conductivity as conventional mineral wool as well as reducing dust generation rate, And a mineral wool fiber produced therefrom.

The composition of the present invention comprises 40 to 45 wt% of SiO ₂ , 12 to 16 wt% of Al ₂ O ₃ , 4.0 to 9.5 wt% of FeO, 0.1 to 3.0 wt% of Fe ₂ O ₃ , 18 to 23 wt% of CaO, %, MgO 7 - 12 wt%, and alkali metal oxide 1 - 5 wt%.

The mineral wool fibers of the present invention are made from the composition for producing the low dust mineral wool fibers.

The thermal insulation product of the present invention comprises said mineral wool fibers.

According to the present invention, it is possible to secure heat resistance, heat insulation, nonflammability, and low thermal conductivity of the same level as conventional mineral wool, and to provide a mineral wool having an improved stagnation and a low dusting rate, , The mineral wool fibers of the present invention can be produced by using a conventional mineral wool fiber manufacturing process and a fibrous device.

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

The composition for producing low dust mineral wool fibers according to the present invention comprises 40 to 45 wt% of SiO ₂ , 12 to 16 wt% of Al ₂ O ₃ , 4.0 to 9.5 wt% of FeO, 0.1 to 3.0 wt% of Fe ₂ O _3, 18 to 23% by weight of CaO, 7 to 12% by weight of MgO and 1 to 5% by weight of an alkali metal oxide.

The composition for producing a low dust mineral wool fiber according to the present invention is characterized by having the characteristics such as heat resistance, heat insulation, nonflammability, low thermal conductivity and the like of conventional mineral wool fibers by specifying the component content as described above, And can provide a variety of thermal insulation products including the mineral wool fibers.

The SiO ₂ (silicon dioxide) used in the composition of the present invention is a network-forming oxide that forms the basic structure of mineral wool fibers, and may include 40 to 45 wt%, for example 42 to 45 wt%, based on the total weight of the composition. When the content of SiO ₂ is too small, the heat resistance of the mineral wool fibers is lowered, the linear shrinkage ratio is increased, the shot (fine fibrous material) content and the disintegration rate can be increased, There may arise a problem that the crushing rate increases.

Al ₂ O ₃ used in the composition of the present invention is an intermediate oxide which functions to improve the heat resistance and water resistance of mineral wool fibers and is 12 to 16% by weight, for example, 14 to 16% by weight, May be included. If the content of Al ₂ O ₃ is too small, the line shrinkage ratio may increase, and if the content is too large, the disintegration rate may increase.

The iron oxide used in the composition of the present invention affects the heat resistance and the linear shrinkage ratio of mineral wool fibers as FeO and Fe ₂ O ₃ , and contains 4.0 to 9.5 wt% of FeO, for example, 4.5 to 8.5 wt% 0.1 to 3.0% by weight, for example, 0.1 to 2.5% by weight of ₂ O ₃ . If the content of iron oxide is too small, the linear shrinkage ratio of the mineral wool fibers may increase. On the other hand, if the content is too large, the fiber manufacturing equipment is overloaded and the durability is deteriorated.

CaO and MgO used in the composition of the present invention are modified oxides which improve the salt solubility of mineral wool fibers, decrease the viscosity of the glass melt, and improve the chemical durability, and contain 18 to 23% by weight of CaO, For example, 18.5 to 23% by weight and MgO 7 to 12% by weight, such as 8 to 10% by weight. If the content of each of CaO and MgO is too small, the disintegration rate of mineral wool fibers may increase. Conversely, if the content is too large, the difference between the crystallization temperature and the fiberization temperature decreases, Which causes deterioration of the fiber quality such as an increase in the content.

The alkali metal oxide used in the composition of the present invention is a further modified oxide which functions as a non-crosslinking agent for the glass to smoothly melt when melted and to improve salt solubility, The oxide may be sodium oxide (Na ₂ O), potassium oxide (K ₂ O), or a mixture thereof. The content of the alkali metal oxide may be 1 to 5% by weight, for example, 2.5 to 3% by weight based on the total weight of the composition. When the content is too small, melting is difficult and the melting energy is consumed. And the possibility of occurrence of microfibrous particles increases. On the other hand, if the content is too large, the water resistance may be deteriorated and the high temperature stability may be lowered.

There is no particular limitation on the method of preparing the composition for preparing mineral wool fibers according to the present invention, and it is possible to produce the composition for ordinary mineral wool fibers by using the above-mentioned components in the above-mentioned content range. For example, an electric melting method, but the present invention is not limited thereto. Preferably, the electric resistance type electric furnace using a graphite electrode may be used, or a cupola method in which hot air is supplied through a tuyere and internal coke is used as a heat source.

There is no particular limitation on the method for fiberizing the composition for producing mineral wool fibers of the present invention, and conventional methods of fiberizing, such as blowing or spinning, can be applied, and generally used external centrifugal equipment (spinner) have. In applying such a fibrosis method, the viscosity range required for the composition for making fibers can be from 20 to 100 poise. The viscosity of the melt is a function of the temperature and the composition, and the viscosity of the melt with the same composition depends on the temperature. When the temperature of the melt is high, the viscosity is low. On the contrary, when the temperature of the melt is low, the viscosity is high, which affects the fiberization. If the viscosity of the fiber composition is too low at the fiberization temperature, the length of the resulting fiber is short and not only fine but also a lot of fine microfibrillated shots are produced, resulting in a low yield of fiberization, and even if the viscosity is too high, There arises a problem that the large fibers are formed and the thick microfibrillated particles (shot) increase.

The mineral wool fibers of the present invention are made from the composition for producing the low dust mineral wool fibers.

The mineral wool fiber according to the present invention can improve the fiber disintegration rate, the linear shrinkage ratio and the like by having the above-mentioned component content and can secure the heat resistance, the heat insulation property, the nonflammability and the low thermal conductivity at the same level as the existing mineral wool.

Although not particularly limited, the mineral wool fibers of the present invention may have a fiber fraction of 1.0% or less and a linear shrinkage of 3.0% or less, for example, 2.8% or less, for example, 2.6% or less. In addition, the amount of microfine material (shot) can be less than 24%.

The thermal insulation product of the present invention comprises the mineral wool fibers of the present invention as described above. There is no particular limitation on the specific form of the heat insulation product, and for example, a plate, a board, a blanket, a pipe cover, or any other form is available, and can be used, for example, as a thermal insulation for a ship.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. However, the scope of the present invention is not limited to these examples.

[ Example  1 to 4]

(Examples 1 and 2) using a three-phase graphite electrode, and a cupola system (Examples 3 and 4) in which hot air was supplied through a Tuyere to melt inner cokes and used as a heat source (Examples 3 and 4) The compositions for the preparation of low-dust mineral wool fibers of Examples 1 to 4 having the composition of Examples 1 to 4 were prepared by spinning a conventional mineral wool (spinning the melt onto a centrifugal spinning spinner surface to stretch the fibers, And the fibers were made into fine fibers by spraying). The content of each component was measured by an inductively coupled plasma (ICP) method. The physical properties of each component were measured by the following methods and shown in Table 1.

Redox  value

Approximately 300 ml of water was added to a 500 ml beaker, which was boiled, then CO ₂ was evacuated and then cooled. 10 ml of sulfuric acid (1: 1) and 10 ml of a saturated solution of boric acid were added thereto and used as a test solution. 0.2 to 0.5 g of a powder sample finely ground to a particle size of about 50 μm or less by coagulating the mineral wool melts is placed in a sealable plastic beaker and wetted with the above test solution (10 ml), and the same amount of sulfuric acid (1: 1) 10 ml) was added thereto, followed by stirring. After the powder sample was completely decomposed, a solution in which saturated boric acid was excessively added was used as an analytical sample. 10 ml of Reinhard Zimmermann solution was added to this analytical sample and titrated with 1/50-N KMnO4 solution. The end point was defined as the point at which the pale pink did not disappear for 30 seconds. After performing the blank test in parallel, the Redox value was calculated from the following equation. At this time, the total iron content as a total of FeO and Fe ₂ O ₃ was determined by ICP analysis.

heating Line contraction ratio

Pads were fabricated with mineral wool and measured by Hot Furnace Method. A pad of a certain standard was prepared, cut into a size of 50 * 50 mm, and the width and length of the cut pad were measured using a vernier caliper. The elevator furnace was then set at 1,000 ° C. When the elevator furnace reached the set temperature, the pads were placed in an elevator furnace and held for 1 hour. After one hour, the pads were taken out and the width and length were measured, and then the rate of linear contraction was calculated from the following equation.

Thermal conductivity

The produced mineral wool fibers were formed into a plate to prepare a sample (300x300x20 mm). For this sample, the average thermal conductivity was measured at a temperature of 20 占 폚, and the temperature difference between the upper and lower plates was 28 占 폚, using a heat flow meter.

Disintegration rate

The produced mineral wool fibers are formed into a plate (300x300x20 mm), divided into quarters and weighed (W1) is measured. The sample was placed on a 10-mesh sieve, and the weight (W2) after shaking in a shaker for 10 minutes was measured, and the crushing rate was measured as follows.

(%) = [(W1-W2) / W1] x100

[ Comparative Example  1 to 6]

Mineral wool fibers were prepared in the same manner as in Example 1 using the compositions for the preparation of low dust mineral wool fibers of Comparative Examples 1 to 4 having the composition shown in Table 2 below. The physical properties of the produced mineral wool fibers were measured and are shown in Table 2.

As can be seen from the above Table 1, the mineral wool fibers prepared from the composition of the present invention had a crushing rate of 1.0% or less, a linear shrinkage of 3% or less, an unfibrous material shot of 24% The occurrence problem and the disintegration rate were remarkably improved and it was confirmed that the thermal conductivity of the same level as that of the conventional one can be secured.

On the other hand, as can be seen from Table 2, in Comparative Examples 1 and 2 in which the content of SiO ₂ was too large or too small, the linear shrinkage rate increased, the shot content increased and the crushing rate increased, 3, the linear shrinkage ratio greatly increased. Further, in Comparative Examples 4 to 6, when the content of MgO or Al ₂ O ₃ deviates from the values in the claims, the crushing rate or the pre-shrinkage ratio increased.

Accordingly, the mineral wool fiber of the present invention has the same level of heat resistance, heat insulation, nonflammability, and low thermal conductivity as conventional mineral wool, and can be suitably used as an inorganic fiber insulation material with improved stagnation and disintegration. I could.

Claims (5)

Wherein the composition comprises 40 to 45 wt% of SiO ₂ , 12 to 16 wt% of Al ₂ O ₃ , 4.0 to 9.5 wt% of FeO, 0.1 to 3.0 wt% of Fe ₂ O ₃ , 18 to 23 wt% of CaO, 12% by weight of an alkali metal oxide and 1 to 5% by weight of an alkali metal oxide. A mineral wool fiber produced by the composition of claim 1 for preparing low dust mineral wool fibers. The mineral wool fiber according to claim 2, wherein the fiber fineness is 1.0% or less. The mineral wool fiber according to claim 2, wherein the linear shrinkage is 3.0% or less. The mineral wool fiber according to claim 2, wherein the microfibrous material content is 24% or less.