KR101798392B1 - manufacturing method of rubber gasket using the Rubber gasket composition of the plate type Heat Exchanger for high temperature steam with fluororubber - Google Patents

Abstract

The present invention relates to a method of manufacturing a rubber gasket by using a composition for producing a rubber gasket for a plate type hot-temperature steam heat exchanger, comprising fluorinated synthetic rubber as a main ingredient. Specifically, without using the ordinary bisphenol-based vulcanizing agent, and by using a peroxide-based vulcanizing agent, the method of the present invention manufactures a rubber gasket for a plate type hot-temperature steam heat exchanger that comprises fluorinated synthetic rubber, carbon black, a crosslinking activator, a co-agent, a peroxide-based vulcanizing agent, and a processing aid. Thus, the rubber gasket manufactured by the method can enhance sealing properties by maintaining excellent compression set even at high temperatures (200C or higher), and by having excellent steam resistance as well, even when exposed to hot steam, can address the problems of bonding to a heating plate and cracking.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a rubber gasket using a rubber gasket composition for a high temperature steam using a fluorine rubber,

The present invention relates to a rubber gasket manufacturing method using a plate type heat exchanger rubber gasket composition for high temperature steam based on fluorine rubber which not only can realize an excellent airtightness capability even at a high temperature (200 ° C or higher) .

Generally, the plate heat exchanger is connected to important process lines such as shipbuilding, construction, machinery, chemical, food, power generation facilities, etc., and serves to cool or warm various fluids, As a key component of the machine, it distributes the fluid inside the heat exchanger and seals the fluid to prevent it from leaking to the outside.

More specifically, when the plate heat exchanger is assembled, the contact points of the respective hot plates form a lattice to form a flow path. Here, the rubber gasket serves to distribute the flow path inside the heat exchanger and to seal the liquid from leaking to the outside will be.

These rubber gaskets are a core part of the plate heat exchanger. When designing the plate heat exchanger, the material of the gasket should be selected according to the temperature, pressure and fluid type of the applied fluid, and the gasket also determines the life of the heat exchanger.

In the past, most of the rubber gasket materials for heat exchangers depend on imports. In recent years, import substitution by domestic technology is gradually expanding and its effect is gradually increasing in order to reduce the cost of raw materials and reduce the cost of raw materials.

However, in the case of the domestic materials, the permanent compressive strain rate, that is, the restoring force, is lowered and is installed in the heat exchanger, causing a serious problem due to the loss of cooling or heating function due to leakage and leakage. Therefore, a rubber gasket for a plate-type heat exchanger of a new composition is required.

In order to solve this problem, Patent Document 1 discloses a process for producing a fluorine-containing resin composition comprising a fluororubber as a main component and a vulcanizing agent, an accelerator and a filler added thereto, wherein 2,2-bis (4-hydroxyphenyl) propane [bisphenol A] Or bisphenol-vulcanized type gasket material using 2,2-bis (4-hydroxyphenyl) perfluoropropane [bisphenol AF].

However, the bisphenol-vulcanized type gasket materials have problems in that when they are exposed to high-temperature (200 ° C) steam for a long time, adhesion and cracks are generated with the heat plate.

Patent Document 1: Korean Patent Publication No. 10-2015-0009947 "Material for gaskets"

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a process for producing a high-temperature steaming plate comprising a fluorine rubber, carbon black, a crosslinking activator, a vulcanizing agent, a peroxide vulcanizing agent, By manufacturing a heat exchanger rubber gasket, it maintains an excellent permanent compression ratio even at high temperature (200 ° C or higher) and improves airtightness. Moreover, it has excellent steam resistance and solves problems of adhesion and cracking with a hot plate even when exposed to high temperature steam. To be able to do so.

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The present invention relates to a process for producing a rubber sheet of a plate-type heat exchanger rubber gasket based on fluoro rubber, which comprises mixing 35 to 55 parts by weight of carbon black, 2 to 6 parts by weight of a crosslinking activator with respect to 100 parts by weight of a fluorinated synthetic rubber , 2 to 5 parts by weight of co-crosslinking, 2 to 5 parts by weight of a peroxide vulcanizing agent and 1 to 4 parts by weight of a processing aid were mixed at a temperature range of 100 to 140 占 폚 using an open roll at a mixing ratio of 10 The mixture was aged for 12 hours or more and then aged for more than 12 hours. Thereafter, it was made into a ribbon having a thickness of 5 mm and a width of 50 mm on an open roll of 60 to 100 ° C., , And crosslinking and molding into a desired shape at a temperature of 160 to 200 DEG C for 3 to 7 minutes in a rubber compression press. Production of rubber gasket for plate heat exchanger for high temperature steam based on fluorine rubber Method of Assignment And the connection means.

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The present invention improves the airtightness of the plate-type heat exchanger as it has a characteristic of permanent compression toughness with excellent restoring force even at a high temperature (200 ° C or higher), and thus there is no risk of leakage or leakage due to long- Especially, because of excellent steam resistance, it can solve the problem of adhesion and cracking with hot plate even when exposed to high temperature steam. Therefore, it is possible to substitute all imported materials, thereby improving supply smoothness, cost reduction and development of domestic rubber industry. There is an effect that the present invention can expect.

The present invention relates to a method of manufacturing a rubber gasket using a fluorine rubber-based plate heat exchanger rubber gasket composition for high temperature steam, and it is only necessary to understand the present invention, It should be noted that the description is omitted so as not to obscure the gist of the present invention.

Hereinafter, a method for manufacturing a rubber gasket using the fluorine rubber-based plate heat exchanger rubber gasket composition for high temperature steam according to the present invention will be described in detail.

First, the plate type heat exchanger rubber gasket composition for high temperature steam based on the fluororubber according to the present invention is prepared by mixing 35 to 55 parts by weight of carbon black, 2 to 20 parts by weight of a crosslinking activator with 100 parts by weight of fluorinated synthetic rubber (fkm) 6 to 5 parts by weight of a peroxide crosslinking agent, 2 to 5 parts by weight of a peroxide vulcanization agent and 1 to 4 parts by weight of a processing aid.

Wherein the carbon black is MT (Medium Thermal) carbon black, the crosslinking activator is zinc (ZnO), the co-crosslinking agent is triallylisocyanurate, the processing aid is an organosilicone, 2,5-di (tert-butylperoxy) hexyne, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne, Benzoyl peroxide, dibenzoyl peroxide, tert-butyl hydroperoxide, 2,4-dichloro benzoyl peroxide, 2-benzoyl peroxide, , 5-dimethylhexane-2,5-di (peroxylbenzoate), dicumyl peroxide, di- (2,4-dichlorobenzoyl) -peroxide ) peroxide, tert-butyl peroxybenzoate or 1,1-di- (tert-butylperoxy) -3,3,5-trimethylcyclohexane (1,1-di- tertbutylperoxy) -3 , 3,5-trimethylcyclohexane) is used.

The fluorine rubber as the main material is a known rubber material excellent in chemical resistance and chemical resistance and does not change its properties even at a wide temperature (stable at 325 ° C), is good in jsrlxmr, is excellent in nonflammability and weatherability, and is non-toxic. On the other hand, in the case of the fluororubber, vulcanization with a bisphenol-based vulcanizing agent results in weak resistance to steam, and if it is exposed to steam at a high temperature (200 ° C) for a long time, adhesion and cracks occur with the hot plate.

Therefore, in the present invention, a peroxide-based vulcanizing agent is used without using a bisphenol-based vulcanizing agent, and as a kind of peroxide-based vulcanizing agent, 2,5-dimethyl-2,5-di (t- butylperoxide) hexane 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne, benzoyl peroxide, dibenzoyl peroxide, tert- butyl hydroperoxide, 2,4-dichloro benzoyl peroxide, 2,5-dimethylhexane-2,5-di (peroxylbenzoate), dicumyl peroxide, di- (2 (2,4-dichlorobenzoyl) -peroxide, tert-butyl peroxybenzoate or 1,1-di- (tert-butylperoxy) 1,1-di- (tertbutylperoxy) -3,3,5-trimethylcyclohexane), and the like. When the content of the peroxide-based vulcanizing agent is out of the above-mentioned range, the effect of improving the steam resistance may be insufficient.

On the other hand, the carbon black is added to improve the mechanical properties of the gasket. The crosslinking activator and the co-crosslinking agent further activate the crosslinking reaction. The processing aid is to improve the processability, And a detailed description thereof will be omitted. In addition, the content is also widely used in this technical field, but the content is not limited thereto, but may be variably applied depending on the kind and environment of the gasket.

Next, a method for manufacturing a plate-type heat exchanger rubber gasket for high temperature steam based on a fluororubber according to the present invention is characterized by comprising mixing 35 to 55 parts by weight of carbon black, 2 to 20 parts by weight of a crosslinking activator with respect to 100 parts by weight of a fluorinated synthetic rubber (fkm) 6 to 10 parts by weight of a peroxide crosslinking agent and 2 to 5 parts by weight of a peroxide vulcanization agent and 1 to 4 parts by weight of a processing aid were mixed at a temperature of 100 to 140 占 폚 using an open roll The mixture was aged for 12 hours or more and then made into a ribbon having a thickness of 5 mm and a width of 50 mm on an open roll at 60 to 100 ° C. Then, , Extruded from a rubber extruder, crosslinked in a rubber compression press at a temperature of 160 to 200 ° C for 3 to 7 minutes, and molded into a desired shape. On the other hand, after the molding is completed as described above, it may be subjected to a normal post-processing step and a packaging step.

At this time, if the molding conditions are out of the above range, the gasket may not be formed properly.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to Examples. However, the present invention is not limited to the following Examples.

1. Manufacture of Rubber Gasket for Plate Heat Exchanger

(Example 1)

46 parts by weight of MT carbon black (N990, manufactured by KARB, Canada), 3 parts by weight of zinc oxide (ZnO) as a crosslinking activator, 3 parts by weight of triallyl isocyanurate , 4 parts by weight of 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne as a peroxide-based vulcanizing agent, 3 parts by weight And 2 parts by weight of an organosilicone (WS280, manufactured by STRUKTOL, USA) as a processing aid were mixed in an open roll at a temperature range of 100 to 140 ° C for 10 to 30 minutes , Aged for 12 hours or more, and then formed into a ribbon having a thickness of 5 mm and a width of 50 mm on an open roll of 60 to 100 ° C, followed by cooling and drying in a cooling device. The dried ribbon is extruded from a rubber extruder to a diameter of 10 mm and a length of 200 cm and is crosslinked and formed at a temperature of 160 to 200 ° C for 3 to 7 minutes in a rubber compression press and subjected to a post- .

(Example 2)

35 parts by weight of MT carbon black (N990, manufactured by KARB Corporation, Canada), 2 parts by weight of zinc oxide (ZnO) as a crosslinking activator, 3 parts by weight of triallyisocyanurate (co-crosslinking agent), 100 parts by weight of fluorinated synthetic rubber ), 2 parts by weight of 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne, which is a peroxide-based vulcanizing agent, And 1 part by weight of an organosilicone (WS280, STRUKTOL, USA) as a processing aid were mixed in an open roll at a temperature range of 100 to 140 ° C for 10 to 30 minutes , Aged for 12 hours or more, and then formed into a ribbon having a thickness of 5 mm and a width of 50 mm on an open roll of 60 to 100 ° C, followed by cooling and drying in a cooling device. The dried ribbon is extruded from a rubber extruder to a diameter of 10 mm and a length of 200 cm and is crosslinked and formed at a temperature of 160 to 200 ° C for 3 to 7 minutes in a rubber compression press and subjected to a post- .

(Example 3)

55 parts by weight of MT carbon black (N990, manufactured by KARB Corporation, Canada), 6 parts by weight of zinc oxide (ZnO) as a crosslinking activator, 3 parts by weight of triallyisocyanurate (coagulant), 100 parts by weight of fluorinated synthetic rubber ), 5 parts by weight of 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne, which is a peroxide-based vulcanizing agent, And 4 parts by weight of an organosilicone (WS280, STRUKTOL, USA) as a processing aid were mixed in an open roll at a temperature range of 100 to 140 ° C for 10 to 30 minutes , Aged for 12 hours or more, and then formed into a ribbon having a thickness of 5 mm and a width of 50 mm on an open roll of 60 to 100 ° C, followed by cooling and drying in a cooling device. The dried ribbon is extruded from a rubber extruder to a diameter of 10 mm and a length of 200 cm and is crosslinked and formed at a temperature of 160 to 200 ° C for 3 to 7 minutes in a rubber compression press and subjected to a post- .

(Comparative Example 1)

2,2-bis (4-hydroxyphenyl) propane [Bisphenol A] was used as a vulcanizing agent without using a peroxide vulcanizing agent.

2. Evaluation of Rubber Gasket for Plate Heat Exchanger

The basic hardness, tensile strength and elongation were measured for the rubber gaskets produced in the above Examples and Comparative Examples, and the heat aging characteristics and permanent compressive strain rate at high temperature were measured and evaluated for the high temperature steam resistance. The heat aging characteristics were measured by hardness change, tensile strength change rate and elongation rate. Both the heat aging characteristics and the permanent compressive strain rate were tested in accordance with KS M 6518 (Vulcanized rubber physical test method).

The change in hardness was measured by measuring the hardness of the manufactured rubber gasket sample using a hardness tester (Shore-A) and then aging it by forcibly aging it at 225 ° C for 226 hours in an aging oven And the hardness was measured again.

The tensile strength and rate of elongation were measured by using a tensile tester (UTM) after measuring the tensile strength and elongation at 225 ° C for 226 hours And the tensile strength and elongation were measured again.

The permanent compressive strain rate was measured by compressing 25.5% (9.38 mm) of a sample of 12.5 mm thickness on the measuring jig, heating it for 72 hours and 336 hours in an aging oven at 150 ° C, The thickness was measured to determine how much it was reduced compared to the initial thickness.

The high temperature steam property evaluation was performed by measuring the gasket state change after 60 days exposure to steam at 150 ° C using a high temperature steam durability tester (Visger, manufactured by Visor Co., Ltd.) after manufacturing the plate heat exchanger gasket.

division Example 1 Example 2 Example 3 Comparative Example 1 Hardness (Shore-A) 84 75 87 84 Tensile Strength (MPa) 20.1 17.4 18.1 16.4 Elongation (%) 220 250 180 225 Heat resistance
225 ° C
226 hours Change in hardness +3 +4 +5 +5 Tensile strength change
(%) -4.9 -6.3 -8.2 -4.7 Elongation change
(%) -19.5 -21.5 -25.6 -19.2 Permanent Compression Row (%)
(150 DEG C X 72 Hrs) 12.1 12.3 15.7 28.4 Permanent Compression Row (%)
(150 < 0 > C X 336Hrs) 14.2 16.8 19.5 29.1 High temperature steam resistance
150 ° C × 60 days no crack no crack no crack crack

As can be seen from Table 1 above. The plate type heat exchanger rubber gasket for high temperature steam based on the fluororubber according to the embodiment of the present invention maintains an excellent permanent compression toughness even at a high temperature (200 ° C or higher), thereby improving the airtightness, It can be understood that the problem of adhesion and cracking with the hot plate can be solved even if it is exposed to high temperature steam.

As described above, the rubber gasket manufacturing method using the plate-type heat exchanger rubber gasket composition for high-temperature steam based on the fluororubber according to the present invention has been described through the preferred embodiments and its superiority is confirmed. However, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the following claims.

Claims (4)

delete delete delete A method of manufacturing a plate-type heat exchanger rubber gasket based on fluorine rubber,
A vulcanizing agent, 2 to 5 parts by weight of a crosslinking activator, 2 to 5 parts by weight of a peroxide vulcanizing agent, and 2 to 5 parts by weight of a vulcanization accelerator, based on 100 parts by weight of fluorinated synthetic rubber (fkm) The mixture obtained by mixing 1 to 4 parts by weight of the preparation is mixed in an open roll at a temperature range of 100 to 140 ° C for 10 to 30 minutes and then aged for 12 hours or more and then aged at 60 to 100 ° C It is made in the shape of a ribbon 5 mm in thickness and 50 mm in width on an open roll, then cooled in a cooling device, dried, extruded from a rubber extruder and heated at a temperature of 160 to 200 ° C for 3 to 7 minutes Crosslinked and molded into a desired shape,
Wherein the carbon black is MT (Medium Thermal) carbon black, the crosslinking activator is zinc oxide (ZnO), the co-crosslinking agent is triallyl isocyanurate, the processing aid is an organosilicone,
The peroxide-based vulcanizing agent may be 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne, benzoyl peroxide benzoyl peroxide, dibenzoyl peroxide, tert-butyl hydroperoxide, 2,4-dichloro benzoyl peroxide, 2,5-dichloro benzoyl peroxide, Dimethylhexane-2,5-di (peroxylbenzoate), dicumyl peroxide, di- (2,4-dichlorobenzoyl) -peroxide Tert-butyl peroxybenzoate or 1,1-di- (tert-butylperoxy) -3,3,5-trimethylcyclohexane (1,1-di- 3,3,5-trimethylcyclohexane), wherein the fluorine rubber-based plate-type heat exchanger rubber gasket composition for high temperature steam is used.