KR20240177010A - Glass fiber with excellent heat resistance using alumina and manufacturing method for thereof - Google Patents

Abstract

The present invention relates to a method for manufacturing glass fiber with excellent heat resistance using alumina, comprising: a step A of synthesizing alumina having a solid content of 1 to 20 wt% using aluminum alkoxides, water, and a peptizing agent; a step B of mixing a thermosetting urea resin having a solid content of 10 to 60 wt% and water with the alumina prepared through step A, and performing stirring and dispersion treatment using a stirrer; a step C of coating the mixture that has gone through the stirring and dispersion process through step B onto glass fibers to a predetermined thickness using a roller, and then performing drying treatment using a dryer at a temperature of 100°C to 150°C; and a step D of performing rolling treatment on the glass fibers that have gone through the coating and drying process through step C to even out their surfaces.

Description

{GLASS FIBER WITH EXCELLENT HEAT RESISTANCE USING ALUMINA AND MANUFACTURING METHOD FOR THEREOF}

The present invention relates to a glass fiber having excellent heat resistance using alumina and a method for manufacturing the same.

Glass fiber is a material that is made by pulling glass into thin fibers, and is an inorganic fibrous material mainly composed of silicates. Fine glass monofilaments with a diameter of 10 ㎛ to 20 ㎛ can be made into a thread shape with a diameter of about 1 mm to 2 mm by focusing them into about 500 to 5,000 strands, or they can be bundled into several or several dozen strands to create a glass fiber bundle with a thicker diameter.

These glass fibers are resistant to high temperatures, do not burn, are not absorbent and have little hygroscopicity, are chemically durable, and do not corrode. They also have high strength, especially tensile strength, low elongation, and great electrical insulation, and are widely used in various industrial fields.

However, due to the nature of the woven material, glass fiber is used at high temperatures of 500℃ to 600℃ and melts at a temperature of about 700℃, losing its function. In addition, dust flying from the product causes severe itching on the skin and is harmful to the human body through the respiratory tract, so there are limitations in its use.

Accordingly, various attempts are being made to improve the heat resistance of glass fibers to expand the usable temperature range and thereby further increase their usability. In this regard, a prior art document on a conventional technology for manufacturing glass fibers with excellent heat resistance that eliminates harmful effects on the human body and enables high-functionality products to be used at high temperatures at low cost is Korean Patent Publication No. 10-0910240 entitled “Glass fibers with excellent heat resistance and their manufacturing method” (hereinafter referred to as “prior art”).

However, in the case of technologies related to manufacturing methods of glass fibers that attempted to improve heat resistance, including conventional technologies, they still had limitations in that they had heat resistance that was insufficient to enable use even at an instantaneous maximum temperature of approximately 1,000℃, and there was a problem that heat treatment could not be performed using a material with an optimal composition suitable for each temperature level.

The present invention was created to solve the above problems, and the purpose of the present invention is to provide a technology for manufacturing glass fibers having a level of heat resistance that can be applied in various ways to insulation-related products and fire-fighting-related products, by selectively adding heat resistance suitable for each temperature level for low temperature and ultra-high temperature use to glass fibers, and by being usable at an instantaneous maximum temperature of about 1,000℃ as ultra-high temperature use.

In order to achieve the above object, the present invention provides a method for manufacturing heat-resistant glass fiber using alumina, comprising: a step A of synthesizing alumina having a solid content of 1 to 20 wt% using aluminum alkoxides, water, and a peptizing agent; a step B of mixing a thermosetting urea resin having a solid content of 10 to 60 wt% and water into the alumina prepared in step A, and performing stirring and dispersion treatment using a stirrer; a step C of coating the mixture that has gone through the stirring and dispersion process in step B onto glass fibers to a predetermined thickness using a roller, and then performing drying treatment in a dryer at a temperature of 100 to 150°C; and a step D of performing rolling treatment on the glass fibers that have gone through the coating and drying process in step C to even out their surfaces.

Here, the A step includes: A-1 step of mixing 0.1 mol part of the aluminum alkoxide and 12 mol parts of water and performing a dissolution treatment in a temperature environment of 80°C to 90°C for 60 minutes; A-2 step of adding 0.6 mol part of water to the dissolution resultant that has undergone the dissolution process in the A-1 step and performing a reaction treatment in a temperature environment of 80°C to 90°C for 60 minutes; A-3 step of adding 0.05 mol part of the peptizing agent prepared from one of hydrochloric acid (HCl), nitric acid ( _HNO3 ), and acetic acid ( _CH3COOH ) to the first reaction resultant that has undergone the reaction treatment in the A-2 step and performing a reaction treatment in a temperature environment of 80°C to 90°C for 24 hours; And the second reaction result that has gone through the reaction treatment process through the above A-3 step is sequentially concentrated and filtered to synthesize alumina having a solid content of 5 wt% to 15 wt%, and the aluminum alkoxide used in the A-1 step is prepared from one of aluminum ethoxide, aluminum isopropoxide, and aluminum tri-sec-butoxide.

According to the first embodiment, the step B is a step of mixing 30 to 50 parts by weight of the alumina, 10 to 30 parts by weight of the thermosetting element resin, and 20 to 60 parts by weight of water, and then performing stirring and dispersion processing using a stirrer.

In addition, the glass fiber that has gone through the coating and drying process through the above step C has a coating thickness of 0.5 to 1.5 mm, and a coating layer dryness has a moisture content of 2 to 10 wt%.

According to the second embodiment, the step B is a step of mixing 55 to 65 parts by weight of the alumina, 5 to 25 parts by weight of the thermosetting element resin, and 10 to 40 parts by weight of water, and then performing stirring and dispersion processing using a stirrer.

Here, the method for manufacturing glass fiber with excellent heat resistance using the alumina further includes a step E of performing a second coating on the glass fiber that has undergone surface smoothing through rolling treatment through the step D, after which the glass fiber is first coated and dried using a roller, to a predetermined thickness, and then a second drying treatment is performed in a temperature environment of 100°C to 150°C using a dryer.

In addition, the glass fiber that has undergone the secondary coating and drying process through the above step E has a coating thickness of 1.5 to 2.5 mm, and a coating layer dryness has a moisture content of 2 to 10 wt%.

Meanwhile, as another example to achieve the above purpose, the present invention includes glass fiber manufactured by the method for manufacturing glass fiber with excellent heat resistance using alumina as described above.

According to the present invention, the following effects can be achieved.

First, it is possible to manufacture glass fibers that have heat resistance that does not melt or change shape even at extremely high temperatures of approximately 1,000℃.

Second, by using glass fibers with heat resistance suitable for ultra-high temperatures to be applied to various products used in various insulation and fire industries, it is possible to develop highly functional products with excellent heat resistance to ultra-high temperatures using low-cost glass fibers.

Third, based on an appropriate composition, it is possible to manufacture glass fibers that are heat-resistant enough not to melt and do not change shape at low temperatures above 300℃, which is efficient in terms of cost and material.

Figure 1 is a flow chart illustrating a method for manufacturing glass fiber with excellent heat resistance using alumina according to the first embodiment of the present invention.
Figure 1 is a flow chart illustrating a method for manufacturing glass fiber with excellent heat resistance using alumina of the present invention according to a second embodiment.

A preferred embodiment of the present invention will be described in more detail with reference to the attached drawings, but technical parts already known will be omitted or compressed for the sake of brevity.

1. Description of a method for manufacturing glass fiber with excellent heat resistance using alumina (first embodiment - for low temperature use)

First, the process of manufacturing a glass fiber having excellent heat resistance using alumina according to the first embodiment of the present invention will be described in detail below with reference to the flow chart in Fig. 1.

(1) Alumina manufacturing step <S110>

In this step, a process is carried out to synthesize alumina having a solid content of 1 wt% to 20 wt% using aluminum alkoxides, water, and a peptizing agent.

Here, alumina refers to a state in which alumina hydrate, rather than alumina particles, is well dispersed in a solvent in a colloidal form using the sol-gel method. It is chemically stable, has a high melting point, and has excellent physical properties such as electrical insulation, mechanical strength, and hardness, as well as being compatible with organic substances, transparency, dispersibility, and storage stability. Therefore, it is widely used in various industrial fields such as plastic surface coating agents, paint additives, and waterproof coating agents.

First, the alumina manufacturing step (S110) is preceded by a process (Step A-1) of mixing 0.1 mol parts and 12 mol parts of water and then performing a dissolution treatment at a temperature environment of 80°C to 90°C for 60 minutes.

Additionally, the aluminum alkoxide used in the step (Step A-1) is prepared as one of aluminum ethoxide (CAS: 555-75-9), aluminum isopropoxide (CAS: 555-31-7), and aluminum tri-sec-butoxide (CAS: 2269-22-9).

Next, 0.6 molar parts of water are added to the dissolution result that has undergone the dissolution process in the previously performed step (Step A-1), and the reaction is treated for 60 minutes at a temperature environment of 80°C to 90°C (Step A-2).

Specifically, as the hydrolysis and polycondensation reaction of the alkoxide occurs through the step (step A-2), aluminum alkoxide, which is one of the precursor types used in the sol-gel method, reacts violently with water to form a hydrate, and the formed hydrate becomes a white, opaque liquid, and the particles become entangled with each other and precipitate.

Following this, a step (A-3) is performed in which 0.05 molar parts of a peptizing agent prepared from one of hydrochloric acid (HCl), nitric acid (HNO ₃ ), and acetic acid (CH ₃ COOH) is added to the first reaction product that has undergone the reaction treatment process in the previously performed step (A-2), and the reaction is performed at a temperature environment of 80°C to 90°C for 24 hours.

Specifically, the particles that were entangled and precipitated in the first reaction result that went through the reaction process in the previously performed step (step A-2) undergo a peptization process in which they are evenly distributed within the solution and formed transparently due to the addition of acid.

Finally, a step (A-4) is performed to complete the manufacturing by sequentially concentrating and filtering the second reaction product that has undergone the reaction treatment process in the previously performed step (A-2), thereby synthesizing an alumina sol having a solid content of 5 wt% to 15 wt% (most preferably 9 wt% to 11 wt%).

Here, the solid content of alumina refers to the weight ratio of the solid content when the total weight of the alumina sol component is taken as 100 parts by weight.

(2) Stirring and dispersion processing step <S120>

In this step, a process is carried out in which a thermosetting element resin having a solid content of 10 wt% to 60 wt% and water are mixed with the alumina prepared through the previously performed alumina manufacturing step (S110), and then stirring and dispersion treatment is performed using a stirrer.

Here, in the case of the first embodiment (based on heat resistance of 300°C or higher), the appropriate content level for each composition is preferably 30 to 50 parts by weight (most preferably, 42 parts by weight) of alumina, 10 to 30 parts by weight (most preferably, 18 parts by weight) of a thermosetting element resin, and 20 to 60 parts by weight (most preferably, 40 parts by weight) of water.

In the case where the composition has such appropriate contents, 30 to 50 parts by weight of alumina (most preferably, 42 parts by weight) is mixed with 10 to 30 parts by weight of a thermosetting element resin (most preferably, 18 parts by weight) and 20 to 60 parts by weight of water (most preferably, 40 parts by weight), and then stirring and dispersion processing is performed using a stirrer.

Here, it is important to have an appropriate content of 30 to 50 parts by weight of alumina (most preferably, 42 parts by weight). This is because if the content of alumina is less than 30 parts by weight, the alumina content is low and the coating thickness becomes thin, and if the content of alumina sol exceeds 50 parts by weight, there is a problem that the manufacturing cost becomes excessive.

In addition, in the case of thermosetting urea resin, it is preferable to use urea products having a solid content of 10 to 60 wt%, a specific product example being ‘Taeyang Synthetic’s UR-50’, and most preferably, 18 parts by weight of a water-soluble urea resin having a solid content of 53 wt% is applied.

In this regard, it is important that the thermosetting urea resin having a solid content of 10 to 60 wt% be combined with 30 to 50 wt% of alumina having a solid content of 5 to 15 wt% to have a content level of 10 to 30 wt%.

This is because, if the thermosetting element resin having a solid content of 10 to 60 wt% is prepared in an amount of less than 10 parts by weight, there is a problem that the adhesive strength is weakened to a minimal level, and if it exceeds 20 parts by weight, there is a problem that sparks occur and dehydration occurs when subjected to direct heat.

In addition, it is also important that the thermosetting element resin having a content level of 10 to 30 parts by weight have an appropriate solid content level of 10 to 60 wt%. This is because if the solid content of the thermosetting element resin is less than 10 wt%, the product transportation cost may increase, and if it exceeds 60 wt%, there is a problem that difficulty occurs in synthesis.

(3) Coating and drying treatment step <S130>

In this step, the mixture that has undergone the previous stirring and dispersion treatment step (S120) is coated on glass fiber to a predetermined thickness using a roller, and then dried in a temperature environment of 100°C to 150°C using a near-infrared dryer.

Through this process, the glass fiber that has gone through the coating and drying process has a coating thickness of 0.5 to 1.5 mm (most preferably, 1.0 mm) and a moisture content of 2 to 10 wt% in the coating layer dryness.

(4) Rolling processing stage <S140>

In this step, the glass fiber prepared through the previously performed coating and drying step (S130) is rolled to ensure an even surface, and then wound to complete the series of processes described above.

The glass fiber produced through this process is a low-temperature glass fiber with properties of heat resistance of 300℃ or higher, and has a light transparent color, good flexibility and water resistance, is not harmful to the human body, is easy to cut, and has the characteristics of not melting when the surface changes at heat of 300℃ or higher and maintaining its appearance as it is.

2. Description of a method for manufacturing glass fiber with excellent heat resistance using alumina (second embodiment - for ultra-high temperature)

First, the process of manufacturing a glass fiber having excellent heat resistance using alumina according to the second embodiment of the present invention will be described in detail below with reference to the flow chart of Fig. 2.

(1) Alumina manufacturing step <S210>

In this step, a process is carried out to synthesize alumina having a solid content of 1 wt% to 20 wt% using aluminum alkoxides, water, and a peptizing agent.

Specific compositional and methodological characteristics related to this step correspond to the description of the alumina manufacturing step (S110) in the method for manufacturing glass fiber with excellent heat resistance using alumina according to the first embodiment of the present invention, so they are omitted.

(2) Stirring and dispersion processing step <S220>

In this step, a process is carried out in which a thermosetting element resin having a solid content of 10 wt% to 60 wt% and water are mixed with the alumina prepared through the previously performed alumina manufacturing step (S210), and then stirring and dispersion treatment is performed using a stirrer.

Here, in the case of the second embodiment (based on heat resistance of 1000°C or higher), the appropriate content level by composition is preferably 55 to 65 parts by weight (most preferably, 60 parts by weight) of alumina, 5 to 25 parts by weight (most preferably, 6 parts by weight) of thermosetting element resin, and 10 to 40 parts by weight (most preferably, 34 parts by weight) of water.

In the case where the composition has such appropriate content, 55 to 65 parts by weight of alumina (most preferably, 60 parts by weight) is mixed with 5 to 25 parts by weight of a thermosetting element resin (most preferably, 6 parts by weight) and 10 to 40 parts by weight of water (most preferably, 34 parts by weight), and then stirring and dispersion processing is performed using a stirrer.

Here, it is important to have an appropriate content of 55 to 65 parts by weight of alumina (most preferably, 42 parts by weight). This is because if the content of alumina is less than 55 parts by weight, the alumina content is low and the coating thickness becomes thin, and if the content of alumina exceeds 65 parts by weight, there is a problem that the manufacturing cost becomes excessive.

In addition, in the case of thermosetting urea resin, it is preferable to use an urea-based product having a solid content of 10 wt% to 60 wt%, a specific product example being ‘Taeyang Synthetic’s UR-50’, and most preferably, 6 parts by weight of a water-soluble urea resin having a solid content of 53 wt%.

In this regard, it is important that the thermosetting urea resin having a solid content of 10 wt% to 60 wt% be combined with 55 wt% to 65 wt% of alumina having a solid content of 5 wt% to 15 wt% to have a content level of 5 wt% to 25 wt%.

This has the problem that if the thermosetting element resin having a solid content of 10 to 60 wt% is prepared in an amount of less than 5 parts by weight, the adhesive strength becomes weak to a minimal level, and if it exceeds 25 parts by weight, there is the problem that sparks occur and dehydration occurs when subjected to direct heat.

In addition, it is also important that the thermosetting element resin having a content level of 10 to 30 parts by weight have an appropriate solid content level of 10 to 60 wt%. This is because if the solid content of the thermosetting element resin is less than 10 wt%, the product transportation cost may increase, and if it exceeds 60 wt%, there is a problem that difficulty occurs in synthesis.

(3) 1st coating and drying treatment stage <S230>

In this step, the mixture that has undergone the previous stirring and dispersion treatment step (S220) is first coated on glass fiber to a predetermined thickness using a roller, and then a first drying process is performed in a temperature environment of 100°C to 150°C using a near-infrared dryer.

(4) Rolling processing stage <S240>

In this step, the glass fiber prepared through the first coating and drying process (S230) is rolled to achieve a smooth surface.

(5) 1st coating and drying treatment stage <S250>

In this step, the glass fibers that have undergone rolling treatment and surface smoothing in the previously performed rolling treatment step (S240) are cut, and then the glass fibers that have undergone the first coating and drying using a roller are secondarily coated to a predetermined thickness, and then a second drying process is performed in a temperature environment of 100°C to 150°C using a near-infrared dryer.

Through this process, the glass fiber that has gone through the coating and drying process has a coating thickness of 1.5 to 2.5 mm (most preferably, 2.0 mm) and a moisture content of 2 to 10 wt% when the coating layer is dry.

The glass fiber prepared through this process is an ultra-high temperature glass fiber with properties of heat resistance of over 1000℃. Specifically, it can be used continuously at a high temperature of 800℃, and at 900℃, it is in a solidified state but does not melt, and has the characteristic of being able to be used continuously in a stationary state.

3. Description of the property test of glass fiber with excellent heat resistance using alumina

(1) Production of alumina

Manufacturing example 1

In a 1,000 mL 4-neck round bottom flask equipped with a thermometer, condenser, and stirrer, mix 0.1 mol of aluminum isopropoxide and 12 mol of water, and dissolve at 80°C to 90°C for 1 hour.

After that, 0.6 moles of water are added to the dissolved substance to promote hydrolysis and polycondensation of aluminum isopropoxide, and the reaction is allowed to proceed for 1 hour.

Next, 0.05 mol of hydrochloric acid (HCl) as a peptizing agent is added to the first reaction product, and the reaction is performed at 80°C to 90°C for 24 hours. Then, a concentration process is sequentially performed to increase the solid content, and a filter paper is used for filtration to produce alumina having a solid content of 10.8 wt% as Manufacturing Example 1.

Manufacturing example 2

In a 1,000 mL 4-neck round bottom flask equipped with a thermometer, condenser, and stirrer, mix 0.1 mol of aluminum isopropoxide and 12 mol of water, and dissolve at 80°C to 90°C for 1 hour.

After that, 0.6 moles of water are added to the dissolved substance to promote hydrolysis and polycondensation of aluminum isopropoxide, and the reaction is allowed to proceed for 1 hour.

Next, 0.05 mol of nitric acid (HNO ₃ ) is added as a peptizing agent to the first reaction result, and the result is reacted at 80 to 90° C. for 24 hours. Then, a concentration process is sequentially performed to increase the solid content, and a filter paper is used for filtration to produce alumina having a solid content of 10.5 wt% as Manufacturing Example 2.

Manufacturing example 3

In a 1,000 mL 4-neck round bottom flask equipped with a thermometer, condenser, and stirrer, mix 0.1 mol of aluminum isopropoxide and 12 mol of water, and dissolve at 90°C to 95°C for 1 hour.

After that, 0.6 moles of water are added to the dissolved substance to promote hydrolysis and polycondensation of aluminum isopropoxide, and the reaction is allowed to proceed for 1 hour.

Next, 0.05 mol of acetic acid (CH ₃ COOH) as a peptizing agent is added to the first reaction result, and the mixture is reacted at 80 to 90°C for 24 hours. Then, a concentration process is sequentially performed to increase the solid content, and a filter paper is used for filtration to produce alumina having a solid content of 10.7 wt% as Production Example 3.

(2) Manufacturing of glass fiber

Manufacturing example 4

As Manufacturing Example 1, 42 parts by weight of alumina, 18 parts by weight of a thermosetting element resin, and 40 parts by weight of water are mixed, and then stirred and dispersed using a stirrer.

Next, the mixture that has undergone stirring and dispersion treatment is coated on glass fiber with a thickness of 1.0 mm using a roller, and then dried in a 130°C temperature environment using a near-infrared dryer so that the coating layer has a moisture content of 2 wt% to 10 wt%.

Finally, to even out the surface of the glass fiber, it is rolled and then wound to prepare Manufacturing Example 4.

Manufacturing example 5

As Manufacturing Example 1, 60 parts by weight of alumina, 6 parts by weight of a thermosetting element resin, and 34 parts by weight of water are mixed, and then stirred and dispersed using a stirrer.

Following this, the mixture that has undergone stirring and dispersion treatment is first coated on glass fiber using a roller, and then first dried in a 130℃ temperature environment using a near-infrared dryer.

Next, the glass fiber that has gone through the primary coating and drying process is rolled and then cut to ensure an even surface.

The glass fibers cut in this manner are subjected to a secondary coating treatment to form a final coating layer thickness of 2.0 mm, and a secondary drying treatment is performed in a near-infrared dryer at a temperature of 130°C to prepare Manufacturing Example 5 by ensuring that the coating layer has a moisture content of 2 wt% to 10 wt%.

Manufacturing example 6

As Manufacturing Example 2, 60 parts by weight of alumina, 6 parts by weight of a thermosetting element resin, and 34 parts by weight of water are mixed, and then stirred and dispersed using a stirrer.

Following this, the mixture that has undergone stirring and dispersion treatment is first coated on glass fiber using a roller, and then first dried in a 130℃ temperature environment using a near-infrared dryer.

Next, the glass fiber that has gone through the primary coating and drying process is rolled and then cut to ensure an even surface.

The glass fibers cut in this manner are subjected to a secondary coating treatment to form a final coating layer thickness of 2.0 mm, and a secondary drying treatment is performed in a 130°C temperature environment using a near-infrared dryer to ensure that the coating layer has a moisture content of 2 wt% to 10 wt%, thereby preparing Manufacturing Example 6.

Manufacturing example 7

As Manufacturing Example 3, 60 parts by weight of alumina, 6 parts by weight of a thermosetting element resin, and 34 parts by weight of water are mixed, and then stirred and dispersed using a stirrer.

Following this, the mixture that has undergone stirring and dispersion treatment is first coated on glass fiber using a roller, and then first dried in a 130℃ temperature environment using a near-infrared dryer.

Next, the glass fiber that has gone through the primary coating and drying process is rolled and then cut to ensure an even surface.

The glass fibers cut in this manner are subjected to a secondary coating treatment to form a final coating layer thickness of 2.0 mm, and a secondary drying treatment is performed in a near-infrared dryer at a temperature of 130°C to prepare Manufacturing Example 7 by ensuring that the coating layer has a moisture content of 2 wt% to 10 wt%.

(3) Physical property test for storage safety, dispersibility, and element resin compatibility of alumina

A test was performed on storage safety, dispersibility, solid content, and urea resin compatibility using alumina manufactured according to Manufacturing Examples 1 to 3, and the results are shown in Table 1 below.

Storage stability test

For each of Manufacturing Examples 1 to 3, the change in viscosity and the presence or absence of sediment when stored at 25°C for 3 months were checked, and if there was no change, it was marked as ‘○’, if there was a change, it was marked as ‘△’, and if the change was significant, it was marked as ‘×’.

Dispersive Test

For each of Manufacturing Examples 1 to 3, the dispersibility was checked for the presence or absence of filtration due to coagulation. If coagulation was severe and filtration was not possible, it was indicated as ‘×’, if filtration was possible to some extent, it was indicated as ‘△’, and if filtration was possible easily, it was indicated as ‘○’.

Solid content measurement

For each of Manufacturing Examples 1 to 3, the solid content was measured by evaporating the solvent at 100°C using an infrared heater and expressed as a numerical value. The indicated numerical value is the average value measured three times with the same solution.

Element resin compatibility

For each of Manufacturing Examples 1 to 3, compatibility with the elemental resin was confirmed. If there was no layer separation after one week, it was marked as ‘○’, if there was a change, it was marked as ‘△’, and if the change was significant, it was marked as ‘×’.

Manufacturing example 1 Manufacturing example 2 Manufacturing example 3 Storage Safety ○ ○ △ Dispersive ○ ○ × Solid content (weight%) 10.8 10.5 10.7 Element resin compatibility ○ ○ △

(4) Physical property test for heat resistance by glass fiber manufacturing method example

First, the level of heat resistance was verified for glass fibers to which heat resistance was added due to the coating layer in Manufacturing Examples 4 and 5, and the results are as shown in Table 2 below.

ingredient Manufacturing example 4 Manufacturing example 5 Coating thickness 1mm 2mm Coating recovery 1 coat 2 coats Manufacturing example 1
(10% solid content) 42 weight 60 weight urea resin
(53% solid content) 18 weight 6 weight Water (diluent) Remaining amount Remaining amount result Heat resistance of 300℃ or higher Heat resistance of over 900℃

(5) Physical property test on human toxicity and heat resistance of ultra-high temperature glass fiber

Finally, a physical property test for human toxicity and heat resistance was performed on glass fibers that had heat resistance sufficient to enable use at an instantaneous maximum temperature of approximately 1,000°C due to the coating layer according to Manufacturing Examples 5 to 7, and the results are shown in Table 3 below.

division Prototype (conventional) Manufacturing example 5 Manufacturing example 6 Manufacturing example 7 Maximum operating temperature 500~600℃ About 1,000℃ About 1,000℃ About 1,000℃ Dust Mass occurrence doesn't exist doesn't exist doesn't exist Harmfulness Skin diseases, respiratory diseases, inflammation, etc. doesn't exist doesn't exist doesn't exist Heat resistance commonly excellence excellence excellence

As a result, in the case of low-temperature glass fiber, it is most desirable to have an embodiment such as Manufacturing Example 4 to provide heat resistance with the characteristics of being light transparent, flexible and waterproof, non-hazardous to the human body, easy to cut, and maintaining the appearance without melting but changing the surface at a heat of 300°C or higher.

In addition, in the case of ultra-high temperature glass fiber, it is preferable to have embodiments such as Manufacturing Examples 5 to 7 in order to provide glass fiber that has a level of heat resistance that can be used at an instantaneous maximum temperature of about 1,000℃ and can be applied to various insulation-related products and fire-fighting-related products, and that is also harmless to the human body.

The embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the rights of the present invention.

Claims (8)

Step A of synthesizing alumina having a solid content of 1 wt% to 20 wt% using aluminum alkoxides, water, and a peptizing agent;
Step B of mixing a thermosetting element resin having a solid content of 10 wt% to 60 wt% and water into the alumina prepared through the above step A, and then performing stirring and dispersion processing using a stirrer;
Step C, in which the mixture that has gone through the stirring and dispersion process through the above step B is coated on glass fiber to a predetermined thickness using a roller and then dried in a temperature environment of 100°C to 150°C through a dryer; and
A method characterized by including a D step for performing surface smoothing by rolling the glass fiber that has gone through the coating and drying process through the above C step;
A method for manufacturing glass fiber with excellent heat resistance using alumina.
In the first paragraph,
The above step A is,
Step A-1: mixing 0.1 mol of the aluminum alkoxide and 12 mol of water and performing a dissolution treatment at a temperature of 80°C to 90°C for 60 minutes;
Step A-2, in which 0.6 molar parts of water are added to the dissolution result that has gone through the dissolution process in Step A-1 and the reaction is carried out for 60 minutes at a temperature environment of 90°C to 95°C;
Step A-3, in which 0.05 molar part of the peptizing agent prepared from one of hydrochloric acid (HCl), nitric acid (HNO ₃ ), and acetic acid (CH ₃ COOH) is added to the first reaction product that has undergone the reaction treatment process through the above step A-2, and the reaction is treated for 24 hours at a temperature environment of 90°C to 95°C; and
Step A-4 is provided by sequentially concentrating and filtering the second reaction product that has gone through the reaction treatment process through the above Step A-3 to synthesize alumina having a solid content of 5 wt% to 15 wt%.
The aluminum alkoxide used in the above step A-1 is characterized in that it is prepared as one of aluminum ethoxide, aluminum isopropoxide, and aluminum tri-sec-butoxide.
A method for manufacturing glass fiber with excellent heat resistance using alumina.
In the second paragraph,
The above step B is characterized in that it is a step of mixing 30 to 50 parts by weight of the alumina, 10 to 30 parts by weight of the thermosetting element resin, and 20 to 60 parts by weight of water, and then performing stirring and dispersion treatment using a stirrer.
A method for manufacturing glass fiber with excellent heat resistance using alumina.
In the third paragraph,
The glass fiber that has gone through the coating and drying process through the above step C has a coating thickness of 0.5 to 1.5 mm and a coating layer dryness having a moisture content of 2 to 10 wt%.
A method for manufacturing glass fiber with excellent heat resistance using alumina.
In the second paragraph,
The above step B is characterized in that it is a step of mixing 5 to 25 parts by weight of the thermosetting element resin and 10 to 40 parts by weight of water with 55 to 65 parts by weight of the alumina, and then performing stirring and dispersion treatment using a stirrer.
A method for manufacturing glass fiber with excellent heat resistance using alumina.
In paragraph 5,
The method for manufacturing glass fiber with excellent heat resistance using the above alumina is as follows:
The glass fiber that has undergone surface smoothing through rolling treatment through the above D step is cut, and then the glass fiber that has undergone the first coating and drying using a roller is secondarily coated with a predetermined thickness, and then a second drying treatment is performed using a dryer in a temperature environment of 100°C to 150°C; characterized by further including a step E;
A method for manufacturing glass fiber with excellent heat resistance using alumina.
In Article 6,
The glass fiber that has undergone the second coating and drying process through the above E step has a coating thickness of 1.5 to 2.5 mm and a coating layer dryness having a moisture content of 2 to 10 wt%.
A method for manufacturing glass fiber with excellent heat resistance using alumina.
A glass fiber characterized by being manufactured by a method for manufacturing glass fiber having excellent heat resistance using alumina according to any one of claims 1 to 7.