KR100374048B1 - Oil and ozone resistant transformer gasket and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a process for producing oil / ozone-resistant transformer gaskets and articles thereof, to oil-resistant NBR rubber 45-55 wt%, carbon 80-90 wt%, rubber compound oil 1-2 wt%, oxidizing agent 0.1-2 wt%, and the like. As a component, it is obtained by mixing, stirring, shaping, and heating and compressing by adding 45 ~ 55wt% of the total mixture composed of 6 ~ 19wt% of sun cracking inhibitor, anti-aging agent, vulcanization accelerator, dispersing agent and other components of softener. The present invention relates to a method for manufacturing an oil / ozone resistant transformer gasket having good compression and permanent enjoyment rate and aging resistance without cracking in oil leakage and exposure of oil such as insulator packing.

Description

OIL AND OZONE RESISTANT TRANSFORMER GASKET AND MANUFACTURING METHOD THEREOF

The present invention relates to a process for producing oil / ozone-resistant transformer gaskets and articles thereof, to oil-resistant NBR rubber 45-55 wt%, carbon 80-90 wt%, rubber compound oil 1-2 wt%, oxidizing agent 0.1-2 wt%, and the like. As a component, it is obtained by mixing, stirring, shaping, and heating and compressing by adding 45 ~ 55wt% of the total mixture composed of 6 ~ 19wt% of sun cracking inhibitor, anti-aging agent, vulcanization accelerator, dispersing agent and other components of softener. The present invention relates to a method for manufacturing an oil / ozone resistant transformer gasket having good compression and permanent enjoyment rate and aging resistance without cracking in oil leakage and exposure of oil such as insulator packing, and articles thereof.

In general, in order to supply high-quality power smoothly, as a result of the improvement of the quality of various materials including the steel sheets and insulators constituting the transformer, and the improvement of manufacturing technology, the transformer is also smaller and lighter than other devices, especially the column transformer This trend is prominent.

In particular, the cooling system in transformers is adopted in various ways depending on the size of the capacity.In the case of inlet transformers of medium capacity or less, most of them are inductor-cooled except for special cases.Insulated dry transformers, transformers using non-flammable oil, and iron cores A variety of transformers are emerging in structure and form such as transformers.

By the way, in the various transformers, the gasket, which is mainly used for packing, is usually composed of synthetic rubber material, but due to insufficient component composition or inefficient mixing ratio, oil leakage occurs frequently during use, and due to compression of terminals. Aging of the packing did not last long, and the exposed part caused cracking in the sunlight, causing oil leakage. Especially, in the near-ground where ozone warning is frequently generated due to changes in the global environment, cracking and aging caused by ozone Is accelerating.

The present invention has been made in view of the above-mentioned problems, and a transformer gasket having a good oil compression resistance and aging resistance and a good oil resistance and ozone resistance without cracking in oil leakage and exposure of oil such as a lid, an inside, insulator packing, etc. The purpose is to provide.

In the production method of the oil / ozone-resistant transformer gasket of the present invention and its articles, oil-resistant NBR rubber is 45 to 55 wt%, carbon 80 to 90 wt%, rubber compound oil 1 to 2 wt%, oxidizing agent 0.1 to 2 wt% and other components. 45 to 55 wt% of the total mixture consisting of 6 to 19 wt% of the sun cracking inhibitor, the anti-aging agent, the vulcanization accelerator, the dispersing agent, and the other components of the softener is added, mixed, stirred, molded and heat-compressed.

Here, NBR rubber as a main component is used as raw material in the form of agglomerate as an oil-resistant rubber raw material, and SRF (Semi Reinforcing Furnace) is used as carbon.

As the rubber compounding oil, aromatic, paraffinic, or plasticizer may be used. Among them, DOP is most preferable, and zinc oxide, which is generally used in the art, is preferable as the oxidizing agent.

As other components, SUNPRAX 652, 654 is used as the sun cracking inhibitor, and RD (2,2,4-Trimethyl-1,2-dihydroquinoline polymer) which is a heat-resistant and acid-proof dustproof agent as a rubber aging inhibitor, and heat, bending, and acid-resistant And 3C (N-Phenylene-N-isopropyl-p-phenylenediamine) having excellent ozone resistance, and the vulcanization accelerator of NBR is DM (Dibenzothiazyl disulfide), TT (Tetramethylthiuram, TMTD) and CZ (N-Cyclohexyl-2). -benzothiazylsulfonamine) is preferably used in combination.

As the dispersant of the mixture, a mixture of BLE-N and STRUKTOL WB212, which are a reactant of diphenylamine and acetone, is preferable. Stearic acid, which is usually used as a softener, is added, and aromatic petroleum resin (CIR) is added.

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

Put 35 kg of NBR chunks in a chemical mixing tank (roll) with a cooling device, add 29 kg of carbon, 0.5 kg of DOP, 0.35 kg of zinc oxide, and add SUNPRAX 652, 654, RD, 3C, DM, TT, 5.15 Kg of CZ, BLE-N, STRUKYOL WB212, stearic acid and petroleum resin are added sequentially, followed by mixing and stirring while slowly kneading.

At this time, the roll is warmed due to the reaction heat inside. In this case, the coolant is passed through a cooling water to cool the roll for about 30 minutes, and when the cooling is completed, the roll is flattened and aged at room temperature for one day.

Then, the plate is trimmed, chopped to an appropriate size, placed in a mold and compressed while heating at 150 ° C. for about 10 minutes to obtain a finished product.

The rubber specimen of the transformer gasket of the present invention thus obtained was subjected to a performance test by a national authorized testing institute.

First, the Korea Institute of Chemical Testing and Engineering (KCTR) tested tensile strength, oil resistance and ozone resistance according to KS B 2805-97 and KS M 6518-96. The results are shown in Table 1 below.

Table 1

Test Items unit Result Tensile Strength Elongation Hardness (HS) 100% Tensile Stress MPa% -MPa 14.4340703.1 Tensile strength change rate Elongation change rate Hardness change (HS) compression permanent reduction rate after aging (120 ± 1 ℃ × 70hrs) %%-% 3.4-22.6517 Oil Resistance Test (120 ± 1 ℃ × 70hrsNo.1 Oil) Tensile Strength Change Rate Elongation Change Rate Hardness Change (HS) Volume Change Rate %%-% -1.2-21.94-4.9 Ozone crack test (50 ± 5pphm × 40 ± 2 ℃ × 20% elongation × 72hrs) - No crack

In addition, the KERI tested in accordance with KS B 2805 (1992) Type A and KS M 6518 (1996), and the results are shown in Table 2 below.

[Table 2]

Test Items Test standard Test result Judgment Normal state Tensile Strength (MPa) 9.8 minimum 14.63 Good Elongation (%) 250 minimum 400.2 Good Aging test (120 ℃, 70 hours) Tensile Strength Change Rate (%) -15 max 3.0 Good Elongation rate of change (%) Up to -45 -32.5 Good Oil proof test (120 ℃, 70 hours) Tensile Strength Change Rate (%) -15 max 5.0 Good Elongation rate of change (%) -40 max -20.7 Good Ozone crack test (50 ± 5pphm, 40 ℃, 29% elongation, 72 hours) Appearance No cracking No crack Good

Examining the contents of Table 1 and Table 2, the gasket rubber specimens of the present invention show little change in product due to changes over time, and show excellent performance in oil resistance and ozone crack test.

As described above, in the production method of the oil / ozone-resistant transformer gasket of the present invention, oil-resistant NBR rubber is used as a main component, and carbon and rubber compound oil, an oxidizing agent, and other components are blended in a specific compounding ratio. As a gasket for a transformer obtained through a predetermined process of the present invention, it is excellent in oil resistance and ozone resistance that can be adapted to severe environmental changes, and thus it is expected to be used and applied in related fields.

Claims (4)

NBR rubber 45 ~ 55wt%, carbon 80 ~ 90wt%, rubber compound oil 1 ~ 2wt%, oxidizing agent 0.1 ~ 2wt% and other ingredients mixture of sun protection agent, antioxidant, vulcanization accelerator, dispersing agent and softener 6 ~ 45 to 55 wt% of the total mixture composed of 19 wt% is added to the mixture, followed by mixing, stirring, and heat compression. Rubber compounding oil is DOP, zinc oxide is oxidizing agent, SUNPRAX 652, 654 is used as sun protection agent, and antioxidant is RD (2,2,4-Trimethyl-1,2-dihydroquinoline polymer) and 3C (N-Phenylene-N). -isopropyl-p-phenylenediamine, dibenzothiazyl disulfide (DM) as a vulcanization accelerator, tetramethylthiuram (TTMD), CZ (N-Cyclohexyl-2-benzothiazylsulfonamine) as a dispersant, BLE-N as a reaction product of diphenylamine and acetone , STRUKTOL WB212, stearic acid and aromatic petroleum resin (CIR) as a softener, a method for producing an oil / ozone resistant transformer gasket. delete Oil / Ozone resistant transformer gasket obtained by the method of claim 1. delete