KR20240037719A - Self-extinguishing cable-filling compound for optical cable and manufacturing method thereof - Google Patents

Abstract

The self-extinguishing flame retardant filler for optical cables according to the present invention is manufactured including synthetic oil or mineral oil, SEP resin, antioxidant, and microcapsules, the microcapsules are made of polymer cells and nanofluorinated ketones, and are composed of the microcapsules. The matrix is characterized in that it detects the occurrence of a fire and automatically releases a fire extinguishing agent when the surrounding temperature of the matrix is above 120°C.

Description

Self-extinguishing cable-filling compound for optical cable and manufacturing method thereof}

The present invention relates to a self-extinguishing flame retardant filler for optical cables and a method of manufacturing the same. More specifically, the present invention relates to a self-extinguishing flame retardant filler for optical cables and a method of manufacturing the same. More specifically, the present invention relates to a self-extinguishing flame retardant filler for optical cables, and more specifically, to a cable containing white mineral oil, SEP resin, and nanofluorination, which has no chemical reactivity and excellent thermal stability and low temperature resistance. ,Relates to a self-extinguishing flame retardant filler for externally filled optical cables and a method of manufacturing the same.

Recently, optical cables, which transmit data faster than coaxial cables, are being widely used. Coaxial cables use copper wires, and transmit signals by generating a magnetic field as electricity passes through the copper wires. In these coaxial cables, signal attenuation or distortion occurs due to the interaction of electric and magnetic fields. On the other hand, optical cables use light, which is a very high frequency electromagnetic wave, and have the advantage of being able to send signals at very high speeds because there is no interaction between transmitted lights, and there is almost no distortion of the sent signals.

However, optical cables have the disadvantage of being weak against shock. If shock or stress is applied to the protective tube of the optical cable, the fiber line may be damaged. Therefore, to solve this problem, a buffering agent is filled. The buffering agent is a filler that is filled inside and outside the cable and used for waterproofing, moisture prevention, protection of optical fibers in the optical cable, and insulation.

Currently, many of the raw materials used in cable manufacturing have been developed as flame retardant materials and are used in actual products. However, the cause of fire spread in the event of a fire is the compound filled inside and outside the cable during manufacturing rather than the external material of the cable. Therefore, compounds that are flame retardant fillers have been developed and are in some use, but in order to provide flame retardancy to the compounds, inorganic fillers such as aluminum hydroxide and magnesium hydroxide are added, thereby increasing the weight, or density, of the compounds. This means that after manufacturing the entire cable, the weight of the cable will increase.

Flame-retardant cables containing such flame-retardant fillers increase in weight nearly twice as much as non-flammable cables containing non-flammable fillers, causing the cost incurred in disposing of product waste to increase several times. Therefore, conventional flame retardant cables had the problem of being significantly less economical and efficient.

KR 10-0509314 B1 KR 10-1133303 B1

The present invention was created to solve the above problems,

The object of the present invention is to provide a self-extinguishing flame retardant filler for optical cables that has a lower specific gravity than conventional flame retardant fillers and is composed of white mineral oil, SEP resin, and nanofluorination, has no chemical reactivity, and has excellent thermal stability and low temperature properties, and its production. The goal is to provide a method.

In order to solve the technical problems described above,

The self-extinguishing flame retardant filler for optical cables according to the present invention is manufactured including synthetic oil or mineral oil, SEP resin, antioxidant, and microcapsules, and the microcapsules include polymer cells and nanofluorinated ketones, and the ambient temperature is 120°C. In the above case, it is characterized by detecting the occurrence of a fire and automatically releasing the fire extinguishing agent.

Also preferably, the synthetic oil or mineral oil, the SEP resin and the antioxidant are introduced into the first tank, and the synthetic oil or mineral oil, the SEP resin and the antioxidant added to the first tank are heated. , producing a first mixture by dispersing and stirring by a scraper, transferring the first mixture prepared in the first tank to a second tank, and stirring and vacuuming the first mixture transferred to the second tank. A step of defoaming and cooling, a step of preparing a second mixture by adding the microcapsules to the cooled first mixture, and a step of uniformly dispersing the second mixture in the second tank by a scraper. do.

Also, preferably, in the second step (S200), the temperature of the first mixture contained in the first tank is heated until it reaches 130 to 140 ° C, and the stirring operation time is 2 to 3 hours. .

Also, preferably, in the fourth step (S400), the temperature of the second mixture contained in the second tank is cooled until it reaches 50 to 70 ° C, and the stirring and vacuum defoaming work time is 0.3 to 0.7 hours. It is characterized by

Also preferably, the second mixture includes 40 to 50 wt% of synthetic oil, 40 to 50 wt% of mineral oil, 5 to 15 wt% of SEP resin, 0.1 to 2 wt% of antioxidant, and 0.1 to 2 wt% of microcapsules. It is characterized by

Also preferably, the second mixture includes 85 to 95 wt% of synthetic oil, 3 to 12 wt% of SEP resin, 0.1 to 2 wt% of antioxidant, and 0.1 to 2 wt of microcapsules.

Meanwhile, the manufacturing method of the self-extinguishing flame retardant filler for optical cables of the present invention includes a first step (S100) in which synthetic oil or mineral oil, SEP resin, and antioxidant are added to the first tank, synthetic oil or mineral oil added to the first tank, A second step (S200) in which the SEP resin and antioxidant are heated and dispersed and stirred by a scraper to produce a first mixture, and a third step (S300) in which the first mixture prepared in the first tank is transferred to the second tank. ), a fourth step (S400) in which the first mixture transferred to the second tank is stirred, vacuum degassed, and cooled, and a fifth step (S500) in which microcapsules are added to the cooled first mixture to produce a second mixture. And a sixth step (S600) in which the second mixture is uniformly dispersed in the second tank by a scraper.

According to the self-extinguishing flame retardant filler for optical cables of the present invention and its manufacturing method as described above, the following effects can be obtained.

Flame-retardant fillers developed conventionally have a density that is about twice that of non-flammable fillers, which reduces economic efficiency and efficiency. The present invention has a density similar to that of non-flammable fillers, which generally have a density of 0.85, and has the effect of reducing disposal costs when disposing of cables.

In addition, when a precursor to a fire is detected or the temperature around the cable rises rapidly, the microcapsules mixed in the filling burst and the fire extinguishing agent is automatically released to prevent the spread of fire.

In particular, it is very effective when a fire breaks out in an enclosed space because it suppresses the chain reaction to prevent the fire from continuously activating and extinguishes the flame at its source.

Additionally, the present invention has the advantage of making it easy to clean up the surrounding area since it leaves no carbonized film or ash after combustion.

1 is a cross-sectional view showing the structure of the microcapsule of the present invention.
Figure 2 is a reference diagram showing the microcapsule of the present invention detecting fire and collapsing.
Figure 3 is a reference diagram showing the principle of initial fire suppression by the microcapsule of the present invention.
Figure 4 is a flow chart of the manufacturing method of the self-extinguishing flame retardant filler for optical cables of the present invention.

Hereinafter, in order to explain in detail enough to enable those skilled in the art of the present invention to easily implement the technical idea of the present invention, embodiments of the present invention will be described with reference to the attached table.

The self-extinguishing flame retardant filler for optical cables of the present invention can be manufactured including synthetic oil or mineral oil, SEP resin, antioxidant, and microcapsules.

Here, synthetic oil refers to synthetic hydrocarbon or polyalphaolefin and is most similar to isoparaffinic hydrocarbon extracted from petroleum. The synthetic oil has excellent seal compatibility and thermal stability. It has high hydrolytic stability and chemical inertness, low volatility, and excellent low-temperature characteristics.

At this time, the low temperature characteristics mean low fluidity.

Additionally, the mineral oil is white mineral oil and is also called mineral oil. This is a highly refined paraffin-based oil, and is a colorless, odorless, transparent liquid with excellent rust prevention and lubricating properties.

In addition, the SEP resin is a polymer material of the Styrene-Ethylene polymer or Styrene-Propylene polymer system, which provides thixotropic properties and serves to prevent oil separation. The SEP resin has stable properties at high shear rates, oxidation resistance properties, weather resistance, and high temperature stability.

In addition, the antioxidant serves as a stabilizer in the present invention and can prevent quality deterioration that may occur due to oxidation or aging due to oxygen in the air.

Figure 1 is a cross-sectional view showing the structure of the microcapsule of the present invention, Figure 2 is a reference diagram showing the microcapsule of the present invention detecting a fire and collapsing, and Figure 3 is a diagram showing the initial fire suppression of the microcapsule of the present invention. This is a reference diagram showing the principle.

1 to 3, the microcapsules are made of polymer cells and nanofluorinated ketones, and the matrix composed of the microcapsules detects fire and automatically extinguishes it when the ambient temperature of the matrix is above 120°C. Drugs may be released.

At this time, the polymer cell is mainly used for high-performance fire extinguishing agents. Additionally, nanofluorinated ketone is a synthetic organic substance that is 1.6 times heavier than water and does not conduct electricity. Additionally, it has the property of quickly changing from a liquid state to a gas state and absorbing the heat energy of the flame, making it effective in extinguishing fires. In addition, when extinguishing a fire, it evaporates immediately without causing a chemical reaction, is non-toxic, and has the characteristic of being decomposed in the upper atmosphere by ultraviolet rays and removed within 5 days. Therefore, nanofluorinated ketones do not have harmful effects on the human body or the environment.

And the matrix is a polymer matrix with resin properties and has a structure containing the microcapsules therein.

Figure 4 is a flow chart of the manufacturing method of the self-extinguishing flame retardant filler for optical cables of the present invention.

Referring to Figure 4, the method for manufacturing the self-extinguishing flame retardant filler for optical cables of the present invention is as follows.

First, synthetic oil or mineral oil, SEP resin, and antioxidant are added to the first tank (S100).

Afterwards, the synthetic oil or mineral oil, SEP resin, and antioxidant added to the first tank are heated and dispersed and stirred by a scraper to prepare the first mixture (S200).

At this time, the first tank is preferably heated to reach a temperature of 130 to 140° C., and the total heating and stirring operation time is preferably 2 to 3 hours. Additionally, the first tank can be agitated at high speed using a high-speed scraper operation. This has the effect of preventing the resin or additives from fusing due to the heat inside the tank.

Afterwards, the first mixture prepared in the first tank is transferred to the second tank (S300).

Afterwards, the first mixture transferred to the second tank is stirred, vacuum degassed, and cooled (S400).

At this time, the vacuum degassing refers to a process of removing air bubbles inside the second tank. Additionally, the second tank is preferably cooled to 50-70°C, and the total working time for stirring and vacuum defoaming is preferably 0.3-0.7 hours.

Afterwards, the microcapsules are added to the cooled first mixture to produce a second mixture (S500).

After that, the second mixture is uniformly dispersed in the second tank by a scraper (S600).

At this time, the second tank may be agitated using a low-speed scraper operation. This is because the second mixture contained in the second tank contains microcapsules and, when stirred at high speed, the microcapsules may be shocked.

Therefore, it is preferable that the second mixture is stirred at low speed to protect the microcapsules.

item Test Methods target value Appearance/Shape Visually transparent/gel Density (g/㎤) ASTM D 1475 0.83~0.85 Drop Melting Point (℃) ASTM D 566 over 180 Viscosity (cPs, 25℃) DIN 53018 Up to 30,000 Cone Penetration (25℃)
-40℃
ASTM D 937 400 200
Oil Separation(100℃ⅹ24hrs) FTM 791(323.1) 0.5 IWCS 0.5 Heating Loss(100℃ⅹ24hrs) FTM 791(321.3) 0.5 Oxygen Induction Time(200℃,min) ASTM D 3895 minimum 20 Compatibility Test
(85Cⅹ5 days, Fiber color) IEC 811 No discoloration

Table 1 is a table showing the target specification values of the present invention.

Referring to Table 1, the physical properties of the self-extinguishing flame retardant filler for optical cables targeted by the present invention can be seen. For each physical property, the target value was set based on the American standard test method.

First, the test method for measuring density was conducted based on ASTM D 1475 in the United States. The target density value of 0.83 to 0.85 g/cm3 is a value set for the purpose of the present invention having a density similar to that of a non-flammable product. This means that it is lighter than conventional flame retardant products and can provide great differentiation.

Additionally, the dropping point refers to the temperature at which the sample drops from a solid state to a liquid state when the sample is heated. The dropping point can predict the melting temperature of the filling and can be used as an indicator to set the filling temperature of the filling. Products with a dropping point of less than 180℃ can cause fire and melt sooner than when fire extinguishing is necessary, so the goal was set at 180℃ or higher. The test method for measuring dropping point was based on ASTM D 566 in the United States.

In addition, the test method for measuring viscosity was based on the US DIN 53018. The target value of viscosity was set to 30,000 cPs or less as a result of taking into account the temperature, working pressure, and working speed of the working environment where the filler is directly used. This can be understood as the flowability of the filling, and the temperature of the working environment includes the external temperature in winter or summer. Therefore, samples that satisfy the target value can have the advantage of being easy to work with.

In addition, the penetration degree indicates the hardness of petrolatum, and is expressed in units of 0.1 mm by measuring the depth at which a specified cone penetrates into the sample under specified test conditions using a penetrometer. The test method for measuring intrusion was based on ASTM D 937 in the United States. The test environment was divided into 25℃ and -40℃. If the penetration degree is lower than the target value, the shrinkage of the filling will be large and there is a risk of water infiltrating from the outside due to shrinkage and cracks. Conversely, if the penetration degree is high, it is likely to exist in a semi-liquid or semi-solid form after manufacturing the cable. It has an adverse effect on water penetration tests. Therefore, samples with values close to the target value can have good physical properties and strong resistance to water penetration.

In addition, the test method for measuring oil separation was based on the IWCS of the United States. This test is a test to observe the degree to which a sample is absorbed into a filter paper at a specified temperature, and is applied to the thixotropic jelly compound filled in loose tubes when manufacturing optical communication cables. To minimize oil separation, the target value was set to 0.5.

Additionally, the test method for measuring heat loss was based on the US FTM 791. The target value was set to 0.5 with the goal of minimal heat loss.

In addition, the test method for testing oxygen induction time (O.I.T) was based on ASTM D 3895 in the United States. O.I.T stands for thermal stability and is tested by thermal analysis equipment. This refers to the time it takes for the temperature of the filling to rise and promote oxidation, and in the present invention, the target value is set at 20 minutes or more.

In addition, the compatibility test was based on IEC 811, an international standard test.

In addition, the goal was to enable filling operations at room temperature and a wide temperature range, and to be unaffected by temperature changes.

At this time, the wide temperature range is preferably -40°C to 80°C.

In addition, the goal was that it does not contain metal or crystalline components, is easy to remove, and has low volatility and oil absorption.

In the present invention, an experiment was conducted to derive this target value.

Experimental Examples 1 to 4 below used each sample prepared by the above manufacturing method of the self-extinguishing flame retardant filler for optical cables. To briefly explain the method of manufacturing the self-extinguishing flame retardant filler for optical cables, two or more raw materials among synthetic oil, mineral oil, SEP resin, antioxidant, and pour point depressant are added to the first tank in accordance with their respective weight ratios, then heated and dispersed. It was stirred, and then transferred to a second tank and cooled through a stirring and vacuum degassing process. This is a method of manufacturing self-extinguishing flame retardant filler for optical cables, which includes the steps of inserting microcapsules and dispersing them evenly.

Experimental Examples 1 to 3 are experiments on setting the mixing ratio of the first mixture prepared in the first tank, and Experimental Example 4 is an experiment for the first mixture prepared with reference to the results of Experimental Examples 1 to 3. This is an experiment to measure the physical properties of the self-extinguishing flame retardant filler for optical cables finally manufactured by transferring it to the second tank and inserting the microcapsules.

Experimental Example 1: Experiment on changes in physical properties according to mineral oil

In order to derive the composition ratio of the self-extinguishing flame retardant filler for optical cables that meets the above target value, an experiment on the change in physical properties according to the type of mineral oil was conducted. The samples of Experimental Example 1 are EXP-1, EXP-2, EXP-3, EXP-4, and EXP-5.

Here, mineral oil A and mineral oil B are fluids with the same properties and are distinguished according to the difference in production location.

In addition, since the pour point of general mineral oil is around -15°C, the pour point increases when mixed with other compositions. Therefore, products containing mineral oil tend to harden in low-temperature environments. As the temperature goes down, the harder it becomes, which means that the product shrinks. In the case of optical cables, if the fibers shrink, loss may occur during data transmission.

Therefore, in the case of samples containing mineral oil, a pour point lowering agent was used.

item EXP-1 EXP-2 EXP-3 EXP-4 EXP-5 Synthetic oil (wt%) × × 92 46 46 Mineral oil A (wt%) 92 × × 46 × Mineral oil B (wt%) × 92 × × 46 SEP resin (wt%) 8 8 8 8 8 Antioxidant (wt%) 0.5 0.5 0.5 0.5 0.5 Pour point depressant (wt%) 0.5 0.5 × 0.5 0.5 Working temperature (℃) 130~140 130~140 130~140 130~140 130~140 Working hours (hr) 2.5 2.5 2.5 2.5 2.5 Appearance/Shape(/gel) Transparency Light yellow transparent Transparency Transparency Transparency Density (g/㎤) 0.845 0.845 0.845 0.845 0.845 Dropping point (℃) 200 or more 230 or more 200 or more 200 or more 220 or more Viscosity (cPs) 16,500 26,000 16,500 16,500 20,000 Penetration (0.1mm) 410 400 430 430 400 250 230 300 300 230 Oil separation degree (%) 0 0 0 0 0 O.I.T(min) 60 60 60 60 60 conformance test No discoloration No discoloration No discoloration No discoloration No discoloration

Table 2 is a table showing the results according to Experimental Example 1 of the present invention. Referring to Table 2, EXP-1 and EXP-2 and EXP-4 and EXP-5 were compared under all conditions except mineral oil. It can be seen that the experimental values of viscosity and dropping point of EXP-1 and EXP-4 when mineral oil B was mixed were measured to be high. And although the degree of intrusion was measured lower, the difference was minimal and was near the target value.

As a result of Experimental Example 1, it was determined that it was preferable to use mineral oil B rather than mineral oil A in the present invention.

Experimental Example 2: Experiment on the difference in low-temperature characteristics according to the addition of a pour point depressant when using a mixture of synthetic oil and mineral oil

According to the results of Experimental Example 1, an experiment was conducted to determine whether there was a difference in low-temperature characteristics due to the addition of the pour point depressant, assuming that mineral oil B was used instead of mineral oil A. Here, the samples of Experimental Example 2 are EXP-6, EXP-7, EXP-8, EXP-9, and EXP-10.

item EXP-6 EXP-7 EXP-8 EXP-9 EXP-10 Synthetic oil (wt%) × 46 92 × 46 Mineral oil B (wt%) 92 46 × 92 46 SEP resin (wt%) 8 8 8 8 8 Antioxidant (wt%) 0.5 0.5 0.5 0.5 0.5 Pour point depressant (wt%) × × × 0.5 0.5 Working temperature (℃) 130~140 130~140 130~140 130~140 130~140 Working hours (hr) 2.5 2.5 2.5 2.5 2.5 Appearance/Shape(/gel) Light yellow transparent Transparency Transparency Transparency Transparency Density (g/㎤) 0.845 0.845 0.845 0.845 0.845 Dropping point (℃) 230 or more 220 or more 200 or more 200 or more 220 or more Viscosity (cPs) 26,000 20,000 16,500 26,000 20,000 Penetration (0.1mm) 350 400 430 380 400 170 230 300 210 230 Oil separation degree (%) 0 0 0 0 0 O.I.T(min) 60 60 60 60 over 60 conformance test No discoloration No discoloration No discoloration No discoloration No discoloration

Table 3 is a table showing the results according to Experimental Example 2 of the present invention. Referring to Table 3, when comparing EXP-7 and EXP-10 under all the same conditions except for the pour point depressant, the low temperature characteristics due to the pour point depressant You can see that the difference is slight.

Therefore, as a result of Experimental Example 2, it was determined that in the present invention, it was preferable not to use a pour point depressant when mixing synthetic oil and mineral oil.

Experimental Example 3: Experiment on the difference in low-temperature characteristics according to the addition of a pour point depressant when using a single synthetic oil

According to the results of Experimental Examples 1 and 2, an experiment was conducted to determine whether there was a difference in low-temperature characteristics depending on the addition of the pour point depressant, assuming that synthetic oil was used alone rather than a mixture of synthetic oil and mineral oil. It was carried out. Here, the samples of Experimental Example 3 are EXP-11, EXP-12, EXP-13, EXP-14, and EXP-15.

In addition, two types of SEP resin were tested, and there was no difference in the properties of each depending on the place of production.

item EXP-11 EXP-12 EXP-13 EXP-14 EXP-15 Synthetic oil (wt%) 92 92 92 92 92 SEP ResinAwt%) 8 × 8 × 4 SEP Resin B (wt%) × 8 × 8 4 Antioxidant (wt%) 0.5 0.5 0.5 0.5 0.5 Pour point depressant (wt%) 0.5 0.5 × × × Working temperature (℃) 130~140 130~140 130~140 130~140 130~140 Working hours (hr) 2.5 2.5 2.5 2.5 2.5 Appearance/Shape(/gel) Transparency Light yellow transparent Transparency Transparency Transparency Density (g/㎤) 0.84 0.84 0.84 0.84 0.84 Dropping point (℃) 200 or more 200 or more 200 or more 200 or more 200 or more Viscosity (cPs) 16,500 16,500 16,500 16,500 20,000 Penetration (0.1mm) 430 430 430 430 430 300 300 300 300 300 Oil separation degree (%) 0 0 0 0 0 O.I.T(min) 60 60 60 60 over 60 conformance test No discoloration No discoloration No discoloration No discoloration No discoloration

Table 4 is a table showing the results according to Experimental Example 3 of the present invention.

Referring to Table 4, when reviewing the results of EXP-11, EXP-12, and EXP-13, it was determined that the change in properties depending on whether or not the pour point depressant was added was insignificant. It was an experiment aimed at increasing the low-temperature characteristic effect, but since the penetration degrees at -40℃ were all over 200, it was confirmed that it did not cause light loss characteristics.

Therefore, it was judged desirable not to add a pour point depressant when using synthetic oil alone, rather than using a combination of synthetic oil and mineral oil.

Experimental Example 4: Physical property test of self-extinguishing flame retardant filler for optical cable manufactured without adding pour point depressant

After the first operation was performed using the mixing ratio derived according to the results of Experimental Examples 1 to 3, the second operation was performed by adding microcapsules to the first mixture prepared in the first operation. The first task of Experimental Example 4 is the same as EXP-13, EXP-14, and EXP-15 of Experimental Example 3 above.

The samples of Experimental Example 4 were EXP-16, EXP-17, EXP-18, and EXP-19, and to increase reliability, a retest of Experimental Example 4 was conducted under the same conditions as each sample. The samples for the retest are EXP-20, EXP-21, EXP-22 and EXP-23.

item EXP-16 EXP-17 EXP-18 EXP-19 Synthetic oil (wt%) 92 92 46 46 Mineral oil B (wt%) × × 46 46 SEP ResinAwt%) 8 × 8 × SEP Resin B (wt%) × 8 × 8 Antioxidant (wt%) 0.5 0.5 0.5 0.5 Primary working temperature (℃) 130~140 130~140 130~140 130~140 First work time (hr) 2.5 2.5 2.5 2.5 Capsule injection temperature reached (℃) Below 60 Below 60 Below 60 Below 60 Microcapsule (wt%) 0.5 0.5 0.5 0.5 Cooling operating temperature (℃) 50~70 50~70 50~70 50~70 Secondary work time (hr) 0.5 0.5 0.5 0.5 Appearance/Shape(/gel) Transparency Transparency Transparency Transparency Density (g/㎤) 0.83 0.83 0.83 0.83 Dropping point (℃) 200 or more 200 or more 200 or more 200 or more Viscosity (cPs) 16,500 16,500 16,500 16,500 Penetration (0.1mm) 430 430 430 430 300 300 300 300 Oil separation degree (%) 0 0 0 0 O.I.T(min) 60 60 60 60 conformance test No discoloration No discoloration No discoloration No discoloration

item EXP-20 EXP-21 EXP-22 EXP-23 Synthetic oil (wt%) 92 92 46 46 Mineral oil B (wt%) × × 46 46 SEP ResinAwt%) 8 × 8 × SEP Resin B (wt%) × 8 × 8 Antioxidant (wt%) 0.5 0.5 0.5 0.5 Primary working temperature (℃) 130~140 130~140 130~140 130~140 First work time (hr) 2.5 2.5 2.5 2.5 Capsule injection temperature reached (℃) Below 60 Below 60 Below 60 Below 60 Microcapsule (wt%) 0.5 0.5 0.5 0.5 Cooling operating temperature (℃) 50~70 50~70 50~70 50~70 Secondary work time (hr) 0.5 0.5 0.5 0.5 Appearance/Shape(/gel) Transparency Transparency Transparency Transparency Density (g/㎤) 0.83 0.83 0.83 0.83 Dropping point (℃) 200 or more 200 or more 200 or more 200 or more Viscosity (cPs) 16,500 16,500 16,500 16,500 Penetration (0.1mm) 430 430 430 430 300 300 300 300 Oil separation degree (%) 0 0 0 0 O.I.T(min) 60 60 60 60 conformance test No discoloration No discoloration No discoloration No discoloration

Table 5 is a table showing the results according to Experimental Example 4 of the present invention, and Table 6 is a table showing the results according to the retest of Experimental Example 4 of the present invention.

Referring to Tables 5 and 6, it can be seen that the samples of Experimental Example 4, EXP-16, EXP-17, EXP-18, and EXP-19, all satisfied the initial target values of the present invention. And the retest samples EXP-20, EXP-21, EXP-22, and EXP-23 also satisfied all of the initial target values of the present invention, as in Experimental Example 4.

According to the results of Experimental Example 4, the second mixture of the present invention contains 40 to 50 wt% of synthetic oil, 40 to 50 wt% of mineral oil, 5 to 15 wt% of SEP resin, 0.1 to 2 wt% of antioxidant, and 0.1 to 50 wt% of antioxidant. It may contain 2wt% of microcapsules.

Additionally, the second mixture may include 85 to 95 wt% of synthetic oil, 3 to 12 wt% of SEP resin, 0.1 to 2 wt% of antioxidant, and 0.1 to 2 wt of microcapsules.

The present invention can significantly reduce the specific gravity, which is a disadvantage of conventional flame retardant products, and make the product lighter. Lightening the product can reduce costs and significantly reduce waste disposal costs, creating an economic effect.

In addition, it has excellent low-temperature properties, so even though it contains mineral oil, it does not affect low-temperature loss characteristics, and has the advantage of being safe as it does not generate hydrogen gas.

In addition, it has excellent water shielding properties, and in the event of a fire, the fire extinguishing agent is automatically released to suppress the chain reaction to prevent the fire from continuously activating, and extinguishes the flame at its source, which is very effective in the event of a fire occurring in an enclosed space. has

Therefore, the present invention is an invention that has a remarkable effect that can improve the problems of the prior art.

Claims (6)

In the self-extinguishing flame retardant filler for optical cables,
Manufactured with synthetic or mineral oil, SEP resin, antioxidants and microcapsules,
The microcapsules are
Contains polymer cells and nano fluorinated ketones,
A self-extinguishing flame retardant filler for optical cables that detects a fire and automatically releases fire extinguishing agent when the ambient temperature is above 120°C.
A first step (S100) in which synthetic oil or mineral oil, SEP resin, and antioxidant are added to the first tank;
A second step (S200) in which the synthetic oil or mineral oil, SEP resin, and antioxidant added to the first tank are heated and dispersed and stirred by a scraper to produce a first mixture;
A third step (S300) in which the first mixture prepared in the first tank is transferred to the second tank;
A fourth step (S400) in which the first mixture transferred to the second tank is stirred, vacuum degassed, and cooled;
A fifth step (S500) in which microcapsules are added to the cooled first mixture to produce a second mixture; and
A sixth step (S600) in which the second mixture is uniformly dispersed in the second tank by a scraper.
According to clause 1,
The second mixture is
Self-extinguishing flame retardant for optical cables, comprising 40 to 50 wt% of synthetic oil, 40 to 50 wt% of mineral oil, 5 to 15 wt% of SEP resin, 0.1 to 2 wt% of antioxidant, and 0.1 to 2 wt% of microcapsules. Fillings.
According to clause 1,
The second mixture is
A self-extinguishing flame retardant filler for optical cables, comprising 85 to 95 wt% of synthetic oil, 3 to 12 wt% of SEP resin, 0.1 to 2 wt% of antioxidant, and 0.1 to 2 wt of microcapsules.
According to clause 2,
In the second step (S200),
Heated until the temperature of the first mixture contained in the first tank reaches 130-140°C,
A method of manufacturing a self-extinguishing flame retardant filler for an optical cable, characterized in that the stirring operation time is 2 to 3 hours.
According to clause 2,
In the fourth step (S400),
The temperature of the second mixture contained in the second tank is cooled until it reaches 50-70°C,
A method of manufacturing a self-extinguishing flame retardant filler for an optical cable, characterized in that the stirring and vacuum defoaming operation time is 0.3 to 0.7 hours.