KR20130068799A - High strength glass fiber board and method of manufacturing thereof - Google Patents

Abstract

PURPOSE: A high-strength glass fiber board and a manufacturing method thereof are provided to have high-strength while maintaining an optimum thermal conductive value with a small amount of an inorganic binder by applying aluminum phosphate as the inorganic binder. CONSTITUTION: A high-strength glass fiber board(100) is formed of 0.1 ~ 1.0 part by weight of an inorganic binder(140) based on 100 parts by weight of glass fiber(120), and the inorganic binder is embedded in a surface of the glass fiber. A high-strength glass fiber board manufacturing method comprises the following steps of: (a) mixing and stirring glass fiber in a solvent; (b) removing the solvent by filtering the glass fiber mixed in the solvent using a sieve to obtain a glass fiber extract; (c) spray-coating the inorganic binder on a surface of the glass fiber extract; and (d) compressing the glass fiber extract coated with the inorganic binder.

Description

High strength fiberglass board and its manufacturing method {HIGH STRENGTH GLASS FIBER BOARD AND METHOD OF MANUFACTURING THEREOF}

The present invention relates to a glass fiber board and a method for manufacturing the same, and more particularly, to a high strength glass fiber board and a method for manufacturing the same having a relatively low thermal conductivity and high strength.

In general, glass fiber boards are produced by mixing and stirring micro glass fibers and ordinary glass fibers and drying them in the form of boards. However, in order to produce micro glass fibers using the flame method, there is a problem that the production cost is very high due to pollution caused in the manufacturing process and low yield.

For this reason, production is only possible in some countries. In Europe, the handling of glass fibers with a diameter of 4 μm or less is also regulated due to human hazards.

Therefore, it is required to develop a core material for vacuum insulation using standard glass fibers having a diameter of 4 μm or more. However, since glass fibers having a diameter of 4 μm or more are linear, there is no twisting phenomenon unlike micro glass fibers. A binder is needed.

At this time, the organic binder is generally used because of the low vacuum degree due to volatilization of the organic matter in a vacuum state, the inorganic binder is generally used. However, when the content of the inorganic binder in the glass fiber board is increased, the strength is excellent, but there is a problem that the density is increased and the thermal conductivity value is increased.

Related prior arts are Korean Patent Publication No. 10-2011-0086250 (published Jul. 28, 2011), which discloses a high heat resistant and flame retardant rigid urethane composite insulating material using a high strength nonflammable glass fiber sheet, and a method of manufacturing the same. In addition, there is no disclosure about the technique of impregnating an inorganic binder with a glass fiber board.

It is an object of the present invention to provide a high strength glass fiber board which can realize high strength with a small amount of inorganic binder.

It is another object of the present invention to provide a method for producing a high strength glass fiber board which can exhibit high strength while maintaining an optimum thermal conductivity value with a small amount of inorganic binder.

High-strength glass fiber board according to an embodiment of the present invention for achieving the above object is made of 0.1 to 1.0 parts by weight of the inorganic binder with respect to 100 parts by weight of glass fiber, the inorganic binder is impregnated on the surface of the glass fiber It is done.

High-strength glass fiber board manufacturing method according to an embodiment of the present invention for achieving the above another object is a step of stirring while mixing the glass fiber in a solvent; (b) filtering the glass fibers mixed with the solvent with a sieve to obtain a glass fiber extract while removing the solvent; (c) spray coating an inorganic binder on the surface of the glass fiber extract; And (d) pressing the glass fiber extract coated with the inorganic binder; characterized in that it comprises a.

The high strength glass fiber board and the manufacturing method thereof according to the present invention can exhibit high strength while maintaining an optimal thermal conductivity value with a small amount of inorganic binder by applying aluminum phosphate as the inorganic binder.

1 is a cross-sectional view showing a high strength glass fiber board according to an embodiment of the present invention.
Figure 2 is a process flow chart showing a high strength glass fiber board manufacturing method according to an embodiment of the present invention.
3 is a schematic diagram for explaining the bending test.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, a high strength glass fiber board and a manufacturing method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a high strength glass fiber board according to an embodiment of the present invention.

Referring to FIG. 1, the high strength glass fiber board 100 shown includes a glass fiber 120 and an inorganic binder 140 impregnated on the surface of the glass fiber 120. In this case, the inorganic binder 140 is randomly coated on the surface of the glass fiber 120 by spray coating using a spray method, and then impregnated on the surface of the glass fiber 120 through pressing and drying. Can be.

Here, the high strength glass fiber board 100 may be made of 0.1 to 1.0 parts by weight of the inorganic binder with respect to 100 parts by weight of glass fiber. When the content of the inorganic binder is less than 0.1 part by weight based on 100 parts by weight of glass fiber, it may be difficult to secure a target strength. On the contrary, when the content of the inorganic binder exceeds 1.0 part by weight with respect to 100 parts by weight of glass fiber, the strength increases, but there is a problem that the thermal conductivity rapidly increases.

Glass fiber 120 may be used without limitation as long as it is used for the core material of the vacuum insulator, but it is particularly preferable to use a standardized glass fiber without pollution and easy to produce. Such glass fibers include glass wool, ceramic fiber, rock wool, glass fiber, alumina fiber, silica alumina fiber, silica fiber, silicon carbide fiber and the like.

It is preferable to use such glass fibers 120 having an average diameter of 4 ~ 6㎛ in terms of ease of manufacture. If the average diameter of the glass fiber 120 is less than 4㎛ there is a problem that follows the restrictions on use due to human health. On the contrary, when the average diameter of the glass fiber 120 exceeds 6 micrometers, heat conductivity is generally high and it is not suitable for the core material of a vacuum heat insulating material.

The inorganic binder 140 preferably uses aluminum phosphate. The aluminum phosphate is prepared by the reaction of aluminum hydroxide with a phosphoric acid solution, but aluminum hydroxide has a low solubility and requires heat treatment of 150 ° C. or higher. Therefore, it is preferable to use aluminum nitrate or aluminum salt having high solubility. At this time, in the case of nitrate nitrate, it is preferable to use an acetate salt because of the risk of generation of NOx gas.

At this time, the reaction mechanism is oligo- or poly-phosphate in which phosphate ions, aluminum ions, and acetic acid are dissolved in a solution at room temperature, and a polymerization reaction of phosphoric acid occurs at 150 ° C. or more during the heat treatment after coating. ) And form compounds such as Al (H ₂ PO ₄ ) ₃ , AlH ₂ P ₃ O ₁₀ , Al (PO ₃ ) ₃ , and AL ₂ P ₆ O ₁₈ as the temperature changes. Will be

Aluminum phosphate starts with a smaller precursor than conventional binders of inorganic binders in the form of silica and alumina particles in the conventional sol form, and can exhibit a dense binding effect. Due to this there is an advantage of being more strongly attached to the glass fiber.

Therefore, when the inorganic binder is used as aluminum phosphate, even if only a small amount is added to the surface of the glass fiber by the spray coating method, the target strength can be secured, and as a result, the thermal conductivity value can be prevented from rising. .

On the other hand, it is more preferable that the aluminum phosphate includes phosphorus (P) and aluminum (Al) within the range satisfying the following formula (1).

Equation 1: 10 ≤ [P] / [Al] ≤ 20

Where [] is the mole% of each element)

At this time, when the molar ratio of phosphorus (P) to the mole of aluminum (Al) is less than 10, it is difficult to properly exhibit the hydrophilic effect of phosphorus (P), and there is a problem that the bonding strength with the glass fiber is lowered. On the contrary, when the molar ratio of phosphorus (P) to the molar ratio of aluminum (Al) exceeds 20, the hydrophilicity of phosphorus (P) is excessive and there is a concern that drying may not be performed properly due to absorption of a large amount of moisture. .

Hereinafter, with reference to the high-strength glass fiber board manufacturing method according to the embodiment of the present invention to be described in more detail.

Figure 2 is a process flow chart showing a high strength glass fiber board manufacturing method according to an embodiment of the present invention.

Referring to Figure 2, the high strength glass fiber board manufacturing method shown comprises a raw material mixing step (S210), extract obtaining step (S220), spray coating step (S230), pressing step (S240) and drying step (S250). Can be.

Raw material mixing

In the raw material mixing step (S210), the glass fibers are stirred while mixing with the solvent. In this case, the glass fiber may be used without limitation as long as it is used for the core material of the vacuum insulator, but it is particularly preferable to use a standardized glass fiber without pollution and easy to produce. Such glass fibers include glass wool, ceramic fiber, rock wool, glass fiber, alumina fiber, silica alumina fiber, silica fiber, silicon carbide fiber and the like.

It is preferable to use such glass fibers 120 having an average diameter of 4 ~ 6㎛ in terms of ease of manufacture. If the average diameter of the glass fiber is less than 4㎛ there is a problem that follows the restrictions on use due to human hazards. On the contrary, when the average diameter of glass fiber exceeds 6 micrometers, thermal conductivity is generally high and it is not suitable for the core material of a vacuum heat insulating material.

Meanwhile, water (H ₂ O) may be used as the solvent. At this time, the glass fiber is preferably mixed at 0.5 to 1.0 parts by weight with respect to 100 parts by weight of water. When the glass fiber is added in less than 0.5 parts by weight with respect to 100 parts by weight of water, it is not economical because the content of glass fibers relative to water is insignificant. On the contrary, when the glass fiber is added in excess of 1.0 part by weight with respect to 100 parts by weight of water, it may be difficult to uniformly disperse the glass fiber in water because the content of the glass fiber is excessive.

Extract obtained

In the extract obtaining step (S220), the glass fibers mixed with the solvent are filtered by sieve to obtain the glass fiber extract while removing the solvent.

At this time, the sieve is used for the purpose of removing water as a solvent. That is, when the glass fiber mixed with the solvent is passed through the sieve, only the glass fiber extract is left, and water passes through the sieve to be discharged to the outside. Thereafter, only the glass fiber extracts are collected, and then vacuum-infused to remove residual moisture as much as possible.

Spray coating

Spray coating step (S230) is spray coating the inorganic binder on the surface of the glass fiber extract in a spray method.

In this case, the spray coating of the inorganic binder by spray method has a problem in that when the aluminum phosphate is very small in size of the precursor, a considerable amount of the inorganic binder is lost together with water when the glass fiber and the inorganic binder are stirred and extracted together. Because. Therefore, the inorganic binder should be spray-coated by spraying after obtaining the glass fiber extract to prevent the inorganic binder from being lost.

At this time, it is preferable to add an inorganic binder in 0.1-1.0 weight part with respect to 100 weight part of glass fibers. When the content of the inorganic binder is less than 0.1 part by weight based on 100 parts by weight of glass fiber, it may be difficult to secure a target strength. On the contrary, when the content of the inorganic binder exceeds 1.0 part by weight with respect to 100 parts by weight of glass fiber, the strength increases, but there is a problem that the thermal conductivity rapidly increases.

On the other hand, it is preferable to use aluminum phosphate as the inorganic binder. The aluminum phosphate is prepared by the reaction of aluminum hydroxide and a phosphoric acid solution, but aluminum hydroxide has a high solubility because it has low solubility and requires heat treatment of 150 ° C. or higher. Preference is given to using aluminum salts of late or aluminum acetate. At this time, in the case of nitrate nitrate, it is preferable to use an acetate salt because of the risk of generation of NOx gas.

At this time, the reaction mechanism is oligo- or poly-phosphate in which phosphate ions, aluminum ions, and acetic acid are dissolved in a solution at room temperature, and a polymerization reaction of phosphoric acid occurs at 150 ° C. or more during the heat treatment after coating. ) And form compounds such as Al (H ₂ PO ₄ ) ₃ , AlH ₂ P ₃ O ₁₀ , Al (PO ₃ ) ₃ , and AL ₂ P ₆ O ₁₈ as the temperature changes. Will be

Aluminum phosphate starts with a smaller precursor than conventional binders of inorganic binders in the form of silica and alumina particles in the conventional sol form, and can exhibit a dense binding effect. Due to this there is an advantage of being more strongly attached to the glass fiber.

Therefore, when the inorganic binder is used as aluminum phosphate, even if only a small amount is added to the surface of the glass fiber by the spray coating method, the target strength can be secured, and as a result, the thermal conductivity value can be prevented from rising. .

On the other hand, it is more preferable that the aluminum phosphate includes phosphorus (P) and aluminum (Al) within the range satisfying the following formula (1).

Equation 1: 10 ≤ [P] / [Al] ≤ 20

Where [] is the mole% of each element)

At this time, when the molar ratio of phosphorus (P) to the mole of aluminum (Al) is less than 10, it is difficult to properly exhibit the hydrophilic effect of phosphorus (P), and there is a problem that the bonding strength with the glass fiber is lowered. On the contrary, when the molar ratio of phosphorus (P) to the molar ratio of aluminum (Al) exceeds 20, the hydrophilicity of phosphorus (P) is excessive and there is a concern that drying may not be performed properly due to absorption of a large amount of moisture. .

pressure

In the pressing step (S240), the extract coated with an inorganic binder is pressed. At this time, the pressing may be a pressing roll, a pressing press, or the like. The compression is preferably applied to a pressure of 2.0 ~ 2.4Kg / cm ² . When the crimping pressure is less than ^2.0 Kg / cm ² , there is a fear that sufficient crimping may not be achieved. On the contrary, when the pressing pressure exceeds 2.4 Kg / cm ² , the glass fibers may be broken due to excessive pressing.

dry

In the drying step (S250) the compressed compact is dried for 10 to 20 minutes at 200 ~ 400 ℃. At this time, when drying temperature is less than 200 degreeC, or when drying time is less than 10 minutes, there exists a possibility that sufficient drying may not be made. On the contrary, when the drying temperature exceeds 400 ° C., or when the drying time exceeds 20 minutes, there is a problem that productivity is deteriorated due to excessive drying temperature and time.

As described above, the method of manufacturing the high strength glass fiber board according to the embodiment of the present invention may be finished.

As described above, the high-strength glass fiber board manufactured by the above processes (S210 to S250) may exhibit high strength while maintaining an optimal thermal conductivity value with a small amount of inorganic binder by applying aluminum phosphate as an inorganic binder.

Example

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

1. Sample preparation

Example 1

20 g of glass fiber having an average diameter of 4 μm was mixed with 1000 ml of water (H ₂ O), stirred at 210 rpm for 10 minutes, and the glass fiber mixed with water was filtered with sieve glass The fiber extract was obtained and then vacuum infused to remove the water.

Thereafter, 0.2 g of aluminum phosphate was spray coated on the surface of the glass fiber extract. At this time, the aluminum phosphate was added 1150g 85% phosphoric acid over 5 minutes while stirring 309.5g of distilled water at 230rpm, and then 94.5g of aluminum acetate powder was added over 6 minutes while stirring the diluted phosphoric acid solution at 500rpm and then 20 minutes Obtained by stirring.

Thereafter, the glass fiber extract coated with aluminum phosphate was pressed at a pressure of 2.24 Kg / cm ² and then dried at 300 ° C. for 14 minutes, and cut into a size of 193 * 253 * 2 mm to prepare a glass fiber board sample.

Example 2

A glass fiber board sample was prepared in the same manner as in Example 1 except that a glass fiber having an average diameter of 6 μm was used.

Example 3

A glass fiber board sample was prepared in the same manner as in Example 1 except that 0.8 g of aluminum phosphate was spray coated.

Comparative Example 1

20 g of glass fiber having an average diameter of 6 μm was mixed with 1000 ml of water (H ₂ O), stirred at 210 rpm for 10 minutes, and the glass fiber mixed with water was filtered through a sieve to obtain a glass fiber extract, followed by vacuum incorporation. Water was removed.

Thereafter, the glass fiber extract was pressed at a pressure of 2.24 Kg / cm ² and then dried at 250 ° C. for 16 minutes, and then cut into a size of 193 * 253 * 2 mm to prepare a glass fiber board sample.

Comparative Example 2

20 g of glass fiber having an average diameter of 6 μm and 0.2 g of alumina sol were mixed in 1000 ml of water, stirred at 210 rpm for 10 minutes, and the mixed solution was filtered through a sieve to obtain a glass fiber extract, followed by vacuum The water was removed by incorporation.

Thereafter, the glass fiber extract was pressed at a pressure of 2.5Kg / cm ² and then dried at 320 ° C. for 12 minutes, and then cut into a size of 193 * 253 * 2mm to prepare a glass fiber board sample.

2. Thermal conductivity measurement

After the vacuum insulator was manufactured using six samples according to Examples 1 to 3 and Comparative Examples 1 to 2, respectively, the thermal conductivity values of the vacuum insulators were measured.

3. Handling strength measurement

After cutting the samples according to Examples 1 to 3 and Comparative Examples 1 to 2 to 30 * 190 * 2mm, the bending test by gravity was performed. At this time, Figure 3 is a schematic diagram for explaining the bending test, referring to this, the bending test is a state in which any one of the samples according to Examples 1 to 3 and Comparative Examples 1 to 2 fixed to one side edge of the measurement table As it slowly moves to the left side, it may proceed by measuring the length (d) of the points where each sample is bent by gravity.

4. Property evaluation

Table 1 shows the physical property evaluation results for the samples according to Examples 1 to 3 and Comparative Examples 1 and 2.

[Table 1]

Referring to Table 1, in the case of the samples according to Examples 1 to 3, the thermal conductivity was 3.336 to 3.337 mW / mK, and the measured length at the point of bending by gravity, which is a value representing handling strength, was 17 to 18 cm. have.

On the other hand, in the case of the sample according to Comparative Example 1 is not coated with aluminum phosphate, the thermal conductivity has a value similar to that of Example 1, but it can be seen that the measured length at the point of bending by gravity, which is a value representing the handling strength, is only 9 cm. .

In addition, in the case of the sample according to Comparative Example 2 to which the alumina sol was applied, the thermal conductivity was 3.333 mW / mK which was somewhat lower than that of Example 1, but the measured length at the point of bending by gravity, which is a value representing handling strength, was 6 cm. You can see that only.

As can be seen from the above experimental results, the samples according to Examples 1 to 3, despite the excellent handling strength was confirmed to have a similar thermal conductivity to the samples according to Comparative Examples 1 and 2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. . Accordingly, the true scope of the present invention should be determined by the following claims.

100: fiberglass board 120: glass fiber
140: inorganic binder
S210: mixing raw material step S220: obtaining extract step
S230: spray coating step S240: compression step
S250: Drying Step

Claims (13)

0.1 to 1.0 part by weight of the inorganic binder based on 100 parts by weight of glass fiber,
The inorganic binder is impregnated on the surface of the glass fiber, high strength glass fiber board.
The method of claim 1,
The glass fiber
High strength glass fiber board, characterized by having an average diameter of 4 ~ 6㎛.
The method of claim 1,
The inorganic binder is
A high strength glass fiber board comprising aluminum phosphate.
The method of claim 3,
The aluminum phosphate is
A high strength glass fiber board comprising phosphorus (P) and aluminum (Al) in a range satisfying Equation 1 below.
Equation 1: 10 ≤ [P] / [Al] ≤ 20
Where [] is the mole% of each element)
(a) stirring the glass fibers with mixing in a solvent;
(b) filtering the glass fibers mixed with the solvent with a sieve to obtain a glass fiber extract while removing the solvent;
(c) spray coating an inorganic binder on the surface of the glass fiber extract; And
(d) pressing the glass fiber extract coated with the inorganic binder; high strength glass fiber board manufacturing method comprising a.
The method of claim 5,
In the step (a)
The glass fiber has a method of producing a high strength glass fiber board, characterized in that having an average diameter of 4 ~ 6㎛.
The method of claim 5,
In the step (a)
Wherein said solvent comprises water (H ₂ O).
The method of claim 5,
In the step (a)
The glass fiber is 0.5 to 1.0 parts by weight based on 100 parts by weight of the solvent, characterized in that for mixing the glass fiber board manufacturing method.
The method of claim 5,
In the step (c)
The inorganic binder is added in an amount of 0.1 to 1.0 parts by weight based on 100 parts by weight of the glass fiber.
10. The method of claim 9,
The inorganic binder is
A method of producing a high strength glass fiber board comprising aluminum phosphate.
The method of claim 10,
The aluminum phosphate is
A method of manufacturing a high strength glass fiber board comprising phosphorus (P) and aluminum (Al) in a range satisfying Equation 1 below.
Equation 1: 10 ≤ [P] / [Al] ≤ 20
Where [] is the mole% of each element)
The method of claim 5,
In the step (d)
The crimp is
Method of producing a high strength glass fiber board, characterized in that applying a pressure of 2.0 ~ 2.4Kg / cm ² .
The method of claim 5,
After the step (d)
(e) drying the squeezed compacts at 200 to 400 ° C. for 10 to 20 minutes. The method of manufacturing a high strength glass fiber board further comprising a.

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