JPH07238652A - Dry joint and its manufacture - Google Patents

Abstract

PURPOSE:To prevent a dry joint from dropping by increasing its force of bonding to a sealing material. CONSTITUTION:This dry joint comprises a main body 11 made of rubber and a sealing surface 121 facing the bottom of a joint groove, with a silicone rubber layer 12 formed over the sealing surface 121. A method for manufacturing the dry joint 1 includes preparing both an uncrosslinked mixture for the main body of a rubber component, an organic, peroxide crosslinking agent and an additive such as a reinforcing agent, and an uncrosslinked sealing mixture consisting of a silicone polymer and an organic, peroxide crosslinking agent; molding the uncrosslinked mixture for the main body into the shape of the main body 11 of the dry joint 1; laminating the sealing surface 121 with the uncrosslinked sealing mixture; and heating the joint in the presence of hot air. Preferably the rubber component of the main body 11 is a DCP type EPDM or chlorinated polyethylene.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry joint for closing a joint groove between panels provided on an outer wall of a building or the like and a method for manufacturing the joint.

[0002]

2. Description of the Related Art Conventionally, a large number of panels have been attached to the outer wall of a building for the purpose of protecting the outer wall body. A joint groove is provided between each panel. When closing the joint groove, it is important to consider the water tightness so that rainwater does not invade the outer wall body.

Two methods for closing the joint groove will be described below. First, as the first construction method, as shown in Fig. 5,
There is a wet joint sealing method in which the joint groove 80 provided between the panels 81 and 81 is filled with the liquid or semi-liquid sealing material 2. In addition, reference numeral 89 is an outer wall body, reference numeral 8
2 is a back panel.

A silicone sealant is used as the sealing material 2. The above-mentioned silicone sealant is a room temperature curable rubber, which is extruded from a storage container such as a tube and placed in the environment to cause a curing reaction and become a rubber. Therefore, it is easy to handle and suitable for construction work. Further, since the liquid or semi-liquid sealing material is used, the joint groove is completely closed. Therefore, the above method is excellent in watertightness.

As a second construction method, as shown in FIG. 6, there is a dry joint sealing construction method in which a dry joint 9 made of a rubber molded product having elasticity is prepared and fitted into the joint groove 80. The dry joint 9 is composed of a main body 90 and a main body 9
The lower leg portion 901 includes a main body 90 and a plurality of lip portions 91 and 911 protruding outward from the leg portion 901. Further, in this construction method, the panel 81 and the back panel 82 are previously prepared.
Between them, a dry joint holding material 98 is provided. The dry joint holding material 98 has a convex portion 98 protruding outward at the joint groove 80.
0, and a fitting concave portion 981 for fitting the foot portion 901 of the dry joint 9 is provided in the convex portion 980.

In the above construction method, first, the dry joint 9 is slowly deformed from the outside while the joint groove 8 is being deformed.
Insert for 0. Then, finally, the lip 911 provided on the foot portion 901 is bent and fixed to the fitting recess 981 of the dry joint holding material 98. Also, joint groove 80
In the upper part of, the lip 91 provided above the dry joint 9 is bent to close it.

However, each of the above construction methods has drawbacks. That is, the former wet joint sealing method requires a curing period until the sealing material 2 is completely cured. Therefore, construction work must be interrupted during this period. Further, the silicone sealant is expensive and easily adsorbs dust and is easily soiled.

Further, in the latter dry joint sealing method, it is necessary to previously prepare the holding material 98 as a separate member and attach it. Therefore, the construction work is troublesome. Further, in this construction method, the dry joint 9 is fixed to the holding member 98 by the elasticity of the lip portion 911. For this reason,
If the dry joint 9 deteriorates and its elasticity declines, the holding material 9
There is a risk of falling out of 8. Further, since the joint groove 80 is closed by the elasticity of the lip portion 91, the watertightness is not sufficient.

Therefore, in order to make up for the drawbacks of the above construction method, the following combined joint sealing construction method may be adopted. That is, as shown in FIG. 7, first, a small amount of the sealing material 2 is injected into the joint groove 80. The sealing material 2 is a silicone sealant. And the above-mentioned sealing material 2
The dry joint 9 is inserted into the joint groove 80 before the resin hardens. As a result, since the sealing material 2 is not exposed to the outside, it is not necessary to provide a curing period. Furthermore, since the joint groove 80 is doubly closed by both the sealing material 2 and the dry joint 9, the watertightness is improved. The reference numerals in FIG. 7 are the same as those in FIGS. 6 and 5.

[0010]

However, the above method also has the following drawbacks. That is, the dry joint 9 is generally made of rubber or soft resin. However, the sealing material 2
The silicone sealant used as such and these rubbers do not bond. Therefore, even if the construction method shown in FIG. 7 is adopted, the joint strength between the dry joint 9 and the sealing material 2 is low, and the dry joint 9 cannot be prevented from falling off during long-term use. In view of the above problems, the present invention is to provide a dry joint having a strong bonding force with a sealing material and not falling off, and a manufacturing method thereof.

[0011]

SUMMARY OF THE INVENTION The present invention is a dry joint for closing joint grooves between panels such as outer walls, the dry joint comprising:
A dry joint comprising a main body made of rubber and a seal surface facing the bottom of the joint groove, and a silicone rubber layer formed on the seal surface.

What is most noticeable in the present invention is that a silicone rubber layer is formed on the sealing surface. As a method of forming the silicone rubber layer on the sealing surface, as will be described later, there are a method of integrally molding the both and cross-linking adhesion, a method of coating or sticking the silicone rubber layer on the main body, and the like. .

Next, it is preferable that the main body and the silicone rubber layer are each crosslinked with an organic peroxide, and the bonding surfaces of both are crosslinked. To carry out the above organic peroxide crosslinking and crosslinking adhesion, an organic peroxide crosslinking agent is used for the main body and an organic peroxide crosslinking agent for the silicone rubber as described later.

The organic peroxide cross-linking agent used for the main body is, for example, 1,3 bis (tertiary butyl peroxyisopropyl) benzene, 2,5 dimethyl 2,
5 (tert-butylperoxy) hexyne-3, dicumyl peroxide, 2,4-dichlorobenzoyl peroxide, benzoyl peroxide, 1,1-diterebutylperoxy 3,3,5-trimethylcyclohexane,
2,5-Dimethyl 2,5-dibenzoylperoxyhexane, n-butyl 4,4-diterebutylperoxyvalerate, terebutylperoxybenzoate, diterebutylperoxydiisopropylbenzene, terebutylcumyl peroxide , 2,5-Dimethyl-2,5-diterebutylperoxyhexane, diterebutylperoxide, 2,5-dimethyl2,5-diterebutylperoxyhexyne 3, one or more kinds selected from the group There is.

The organic peroxide crosslinking agent is preferably added so that the amount of active oxygen is 0.005 to 0.02 mol per 100 g of the rubber component. When the amount of active oxygen is less than 0.005 mol, the crosslinking between rubber molecules may be insufficient. If the amount is more than 0.02 mol, the elasticity may be lowered and the rubber may not be formed. There is also a problem that bloom is generated due to the residual organic peroxide crosslinking agent that is not used for crosslinking.

Examples of the organic peroxide crosslinking agent used for the silicone rubber layer include benzoyl peroxide, 1,1-diterebutylbutyloxy 3,3,5-
Trimethylcyclohexane may be mentioned. Also, a platinum-based cross-linking agent can be used. Examples of the platinum-based crosslinking agent include chloroplatinic acid and alcohol-modified chloroplatinic acid. For the above organic peroxide cross-linking and cross-linking adhesion, it is preferable to use a normal pressure hot air heating furnace (HAV), a fluidized bed heating furnace (LCM), a vulcanizer or the like.

Next, the main body is preferably synthetic rubber. The synthetic rubber preferably contains DCP EPDM, chlorinated polyethylene, or a mixture thereof. In this case, a dry joint having excellent bonding strength between the silicone rubber layer laminated on the sealing surface and the main body can be obtained.

That is, conventionally, it has been very difficult to manufacture a rubber laminated product made of synthetic rubber and silicone rubber for the following reasons. When attempting to crosslink the synthetic rubber with sulfur, the sulfur impedes the crosslinking of the silicone rubber. Further, when an attempt is made to crosslink a synthetic rubber with an organic peroxide crosslinker, a decomposition reaction of a rubber polymer occurs in the air. However, by using the synthetic rubber containing the above-mentioned specific components, it is possible to obtain a dry joint having the synthetic rubber and the silicone rubber layer on the main body and the sealing surface, respectively, and firmly bonding the both. .

The DCP EPDM is a DCP
Ethylene containing (dicyclopentadiene) as the third component
It is a propylene copolymer. The chlorinated polyethylene is a random chlorinated product produced by chlorine substitution reaction of polyethylene, and its structure is a three-component copolymer of ethylene, vinyl chloride and 1,2-dichloroethylene.

It is preferable to use the chlorinated polyethylene having a chlorine content of 25 to 45%. If the chlorine content is less than 25%, the properties are similar to those of polyethylene, and there is a possibility that the resin will not be an elastic body. If the content is more than 45%, the properties are similar to those of polyvinyl chloride, and there is a possibility that it will not become an elastic body.

It is preferable that the main body contains the synthetic rubber and other added rubber components. As a result, the extrusion moldability is improved and the crosslinking speed is increased. The added rubber component is, for example, EN
B-based EPDM, isoprene rubber (IR), butadiene acrylonitrile rubber (NBR), styrene butadiene rubber (SBR), chlorosulfonated polyethylene (CS)
M), acrylic rubber (ACM), silicone rubber (Q), fluororubber (FKM), and urethane rubber (U).

Next, the silicone rubber layer is preferably formed on the entire surface of the main body. Since silicone rubber has excellent weather resistance, the dry joint covered by this also has excellent weather resistance. Next, the silicone rubber layer preferably has a thickness of 0.5 mm to 1 mm. The thickness of the silicone rubber layer is 0.5 m
If it is thinner than m, the durability of the layer may be reduced. If it is thicker than 1 mm, the amount of expensive silicone rubber used increases, which may increase the manufacturing cost.

The method for producing the dry joint will be described below. The above manufacturing method is for manufacturing a dry joint having a main body made of rubber and a sealing surface made of a silicone rubber layer facing the bottom of the joint groove, in which a rubber component, an organic peroxide crosslinking agent, a reinforcing agent, and other additives are added. And a non-crosslinking mixture for sealing, which comprises a silicone polymer and an organic peroxide cross-linking agent, are prepared, and the non-crosslinking mixture for main body is formed into the shape of the main body of the dry joint. This is a method for producing a dry joint, which comprises molding, laminating the uncrosslinked mixture for sealing on the sealing surface, and then heating these in the presence of hot air.

Examples of the additives include a filler, a softening agent, a crosslinking accelerator, an acid acceptor, a defoaming agent, and a vulcanization aid in addition to the reinforcing agent. The reinforcing agent and the filler improve the strength of the main body and serve as an extender. As the reinforcing agent and the filler, for example, carbon black, kaolin clay, talc, mica, calcium carbonate and silica are used. The softening agent, when mixing the rubber component and the additive,
This is to facilitate kneading. For example, paraffin oil is used.

The cross-linking accelerator acts together with the organic peroxide cross-linking agent to accelerate the cross-linking rate in a small amount. For example, stearic acid and triallyl isocyanurate are used. The acid acceptor is for trapping chlorine gas dissociated from the chlorinated polyethylene at the time of crosslinking so as not to evaporate. For example, magnesium oxide is used.

The defoaming agent removes bubbles generated in the uncrosslinked mixture. For example, calcium oxide is used. As the vulcanization aid, for example, ethylene dimethacrylate, 1,3 butylene dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, triallyl cyanurate, or triallyl trimellitate is used.

Next, it is preferable that the rubber for the main body is a synthetic rubber, and the synthetic rubber contains DCP EPDM, chlorinated polyethylene or a mixture thereof. As a result, the same effect as above can be obtained. Or
The rubber for the main body is composed of the synthetic rubber and the added rubber, and the added rubber includes ENB EPDM, isoprene rubber (IR), butadiene acrylonitrile rubber (NB
R), styrene butadiene rubber (SBR), chlorosulfonated polyethylene (CSM), acrylic rubber (AC
M), silicone rubber (Q), fluororubber (FKM),
It is preferably one or more selected from the group of urethane rubber (U). As a result, the same effect as above can be obtained.

It is preferable that the additive rubber is added and mixed in the synthetic rubber for the main body in an amount of 5 to 70% (weight%, hereinafter the same). When the amount of the added rubber is more than 70%, the decomposition reaction of the rubber polymer is more dominant than the crosslinking reaction between rubber molecules, and the main body may not be sufficiently crosslinked. On the other hand, if it is less than 5%, it is difficult to obtain the effect of addition.

Next, in carrying out organic peroxide crosslinking and crosslinking adhesion, the temperature is preferably 150 to 300.degree. If the temperature is lower than 150 ° C., the crosslinking rate becomes very slow, which may reduce the productivity. If the above temperature is higher than 300 ℃,
The decomposition reaction of the rubber polymer due to heat may occur, and the desired physical properties may not be obtained. The dry joint of the present invention exhibits particularly excellent sealing performance when a silicone sealant is used as the sealing material.

[0030]

In the dry joint of the present invention, the main body is made of rubber and the sealing surface facing the bottom of the joint groove is formed, and the silicone rubber layer is formed on the sealing surface. As a result, the adhesive strength between the dry joint and the sealing material made of the silicone sealant injected into the joint groove is improved, and the dry joint does not fall off. Further, since the joint groove is closed by both the dry joint and the sealing material, the watertightness is excellent.

Further, according to the above manufacturing method, the excellent dry joint as described above can be easily manufactured. As described above, according to the present invention, it is possible to provide a dry joint which has a strong bonding force with a sealing material and does not fall off, and a manufacturing method thereof.

[0032]

【Example】

Example 1 A dry joint according to an example of the present invention will be described with reference to FIGS. As shown in Fig. 1, the dry joint 1 of this example
Is composed of a main body 11 made of synthetic rubber and a sealing surface 121 facing the bottom of the joint groove 80 (see FIG. 2), and the silicone rubber layer 12 is formed on the sealing surface 121. In addition, the dry joint 1 has lip portions 111 and 112 protruding to the outside of the main body. The above-mentioned synthetic rubber contains chlorinated polyethylene. The same as 1. The silicone rubber layer is also the same as in Example 3.

Next, a combined joint sealing method using the dry joint 1 will be described. As shown in FIG. 2, a small amount of the sealing material 2 is injected into the joint groove 80. afterwards,
As shown in FIG. 3, the dry joint 1 shown in FIG. 1 is deformed and pressed into the joint groove 80. Therefore, the lip portions 111 and 112 are bent according to the shape of the joint groove 80. The lower part of the dry joint 1 is embedded in the sealing material 2. After that, the sealing material 2 is cured. As a result, the dry joint 1 is fixed to the joint groove 80.

Next, the function and effect of this example will be described.
In the dry joint 1 of this example, the surface facing the joint groove 80 is covered with the silicone rubber layer 12. Therefore, the sealing material 2 made of the silicone sealant injected into the joint groove 80 adheres and fixes the dry joint 1 in the process of curing. What is important here is that since the sealing surface 121 of the dry joint 1 is formed by the silicone rubber layer 12, it strongly bonds with the silicone sealant. This is because both contain a silicone component and are firmly bonded to each other. Therefore,
After the sealing material 2 is completely hardened, the dry joint 1 is completely fixed to the joint groove 80, and the dry joint 1 does not fall off.

Further, in this example, the rubber component of the main body 11 of the dry joint 1 contains chlorinated polyethylene. Therefore, the main body and the silicone rubber layer 12 are also firmly joined (see Example 3). Moreover,
The joint groove 80 is the sealing material 2 and the lip portion 1 of the dry joint 1.
It is doubly closed by 12 and. Therefore, the combined joint sealing method using the dry joint 1 of this example is very excellent in watertightness. As described above, according to this example, it is possible to obtain a dry joint which has a strong bonding force with the sealing material and does not fall off.

Further, in the above, the silicone rubber layer 12 is provided only on the back surfaces (sealing surface 121) of the two lower lip portions 111, but it may be provided on the uppermost lip portion 112. Further, the silicone rubber layer 12 can be provided on the entire surface of the dry joint 1.

Example 2 A method for manufacturing a dry joint according to an example of the present invention will be described with reference to FIG. First, an uncrosslinked mixture 110 for a main body, which is formed by mixing a rubber component made of chlorinated polyethylene, an organic peroxide crosslinking agent, and additives such as a reinforcing agent, and a seal made of a silicone polymer and an organic peroxide crosslinking agent. And an uncrosslinked mixture 120 for use in preparing. Next, as shown in FIG. 4, this is put into the crosshead extruder 52.

In the crosshead extruder 52, the main body uncrosslinked mixture 110 is molded into the shape of the main body of the dry joint, and the sealing uncrosslinked mixture 120 is laminated on the sealing surface. Thereby, the laminated molded product 13 is obtained. Next, this laminated molded product 13 is introduced into the crosslinking device 53 and heated in the presence of hot air to obtain the uncrosslinked mixture 11 for the main body.
No. 0, each of the uncrosslinked mixture 120 for the sealing surface is crosslinked and crosslinked with an organic peroxide to obtain a dry joint 1. Finally, the dry joint 1 is cooled using the water cooling device 4. In addition, as the above-mentioned uncrosslinked mixture 110 for the main body, the sample No. shown in Example 3 was used. Use the same as 1.

As the crosslinking device 53, a normal pressure hot air heating furnace (HAV), a fluidized bed heating furnace (LCM) or a vulcanization can is used. Further, the cooling water is constantly circulated in the water cooling device 54.

Example 3 Hereinafter, the samples according to the present invention are shown in Tables 1 to 6 together with Comparative Examples.
Will be explained. This example is a sample No. prepared from the uncrosslinked mixture for main body shown in Tables 1 to 3. 1 to 11 and Comparative Examples C1 to C3 were evaluated for performance.

In the above samples and comparative examples, first, an additive and an organic peroxide crosslinking agent or sulfur are mixed with a specific rubber component to prepare an uncrosslinked mixture for a main body. Next, this is molded into the shape of a test piece and the uncrosslinked mixture for sealing is laminated to obtain a laminated molded article. Next, this laminated molded article was heated in the presence of hot air to give a test piece. In addition,
HAV is used as the crosslinking device, and the rest is the same as in the manufacturing method of Example 2.

Among the above rubber components, chlorinated polyethylene and DCP EPDM are synthetic rubber components for the main body, and E
NB-based EPDM and isoprene rubber are additive rubber components. A silicone polymer containing a polyorganosiloxane is used as the uncrosslinked mixture for sealing, and benzoyl peroxide is used as an organic peroxide crosslinking agent added thereto.

Regarding the above-mentioned uncrosslinked mixture for the main body, Table 1
This will be described with reference to Table 3. In the table, DCP EPD
As M, ENB type EPDM and isoprene rubber, JSR / EP75F and J manufactured by Nippon Synthetic Rubber Co., Ltd., respectively.
SR / EP21 and JSR / IR1200 were used. Also, as the chlorinated polyethylene, Eraslen 401AE manufactured by Showa Denko KK was used. The blending amount of these is
Indicated by weight% in all rubber components.

Dicumyl peroxide was used as the organic peroxide crosslinking agent. Additives are CaCO ₃ and talc as reinforcing agents / fillers, paraffin oil as softening agent, stearic acid as cross-linking accelerator, magnesium oxide as acid acceptor, calcium oxide as defoaming agent,
Triallyl isocyanurate was used as a vulcanization aid.
All of these compounding amounts are numerical values based on 100 parts by weight of the rubber component. The above acid acceptor was used only when chlorinated polyethylene was used in the rubber component.

Sample No. 1 will be described below. First, only chlorinated polyethylene is used as the rubber component. 3 parts by weight of the organic peroxide crosslinking agent is used with respect to 100 parts by weight of the rubber component. As additives, 150 reinforcing agents / fillers, 50 softening agents, 1 crosslinking accelerator 1, 5 acid acceptors, 5 defoaming agents, and 2 parts by weight vulcanization aids are used. The above materials are mixed to form an uncrosslinked mixture. Sample No. 2 to
The same applies to 11, Comparative Examples C1 to C3. Comparative Example C
In 3, the sulfur is used as a cross-linking agent instead of the organic peroxide cross-linking agent. Therefore, no vulcanization aid is used.

Next, Table 4 and Table 5 show sample No. 1-11
The performance evaluation of Comparative Examples C1 to C3 is shown in Table 6. The above performance evaluation was carried out by the presence or absence of stickiness and bloom on the surface of the main body and the cross-linking adhesive strength with the silicone rubber layer. For stickiness and bloom, the surface of the main body is contacted and visually inspected to evaluate whether it is “present” or “not present”.

Next, the measurement of the cross-linking adhesive strength with the silicone rubber layer will be described. For the above measurement, a test piece prepared in advance is forcibly peeled off from the main body and the silicone rubber layer by using a tensile tester specified in JISK6301,
The cross-linking adhesive strength is measured by observing the maximum weight at the time of peeling and the peeled state.

The performance evaluation will be described below. First, as shown in Tables 4 and 5, the sample No. In all of Nos. 1 to 11, stickiness and bloom did not occur in the main body. On the other hand, as shown in Table 6, in Comparative Examples C1 and C2, stickiness and bloom were confirmed on the surface of the main body. For Comparative Example C3,
No stickiness or bloom occurred.

Next, the adhesive strength with the silicone rubber layer will be described. Sample No. Regarding Nos. 1 to 11, the main body and the silicone rubber layer are adhered to each other at their joint surfaces, and the adhesive strength is in the range of 20 to 32. When a load exceeding the above adhesive strength is applied, the two do not separate, and the test piece itself is destroyed. Therefore, it can be seen that the adhesive strength between the two is sufficiently strong for practical use.

On the other hand, in the test pieces of Comparative Examples C1 and C2, the surface of the main body was in the form of rubber paste, and the main body and the silicone rubber layer were not cross-linked at the joint surface. Further, in Comparative Example C3, the silicone rubber layer was in an uncrosslinked state, and similarly, crosslink adhesion was not performed. That is, in the comparative example, it was not possible to obtain a test piece in which the main body and the silicone rubber layer were cross-linked and bonded at the joint surface. Therefore, the adhesive strength could not be measured.

As known from the above, the dry joint prepared by the sample of this example is a dry joint formed by laminating and bonding a main body containing a specific rubber component and a silicone rubber layer. The main body and the silicone rubber layer are each crosslinked with an organic peroxide, and are further crosslinked and bonded at their joint surfaces.

The specific rubber component is DCP EPDM, chlorinated polyethylene or a mixture of both. The rubber component allows the body to be crosslinked with organic peroxide under hot air without the use of sulfur. In this case, the cross-linking reaction between rubber molecules predominates over the decomposition reaction of the rubber polymer, resulting in a good body without surface stickiness and bloom.

Further, there is no sulfur in the above-mentioned main body which hinders the crosslinking reaction of the silicone rubber layer. Therefore, good cross-linking adhesion between the main body and the silicone rubber layer is possible, and a dry joint consisting of both is obtained.

[0054]

[Table 1]

[0055]

[Table 2]

[0056]

[Table 3]

[0057]

[Table 4]

[0058]

[Table 5]

[0059]

[Table 6]

[Brief description of drawings]

FIG. 1 is a sectional view of a dry joint according to a first embodiment.

FIG. 2 is an explanatory view of a joint sealing method in the first embodiment.

FIG. 3 is an explanatory view of a joint sealing method in the first embodiment.

FIG. 4 is an explanatory view of a method for manufacturing a dry joint in Example 2.

FIG. 5 is an explanatory view of a wet joint sealing method in a conventional example.

FIG. 6 is an explanatory view of a dry joint sealing method in a conventional example.

FIG. 7 is an explanatory view of a combined joint sealing method in a conventional example.

[Explanation of symbols]

 1. ． ． Dry joint, 11. ． ． Body, 110. ． ． Uncrosslinked mixture for body, 12. ． ． Silicone rubber layer, 120. ． ． Uncrosslinked mixture for sealing, 121. ． ． Sealing surface, 80. ． ． Joint groove, 81. ． ． Panel, 89. ． ． Outer wall body,

Claims (11)

[Claims] 1. A dry joint for closing a joint groove between panels such as an outer wall, the dry joint comprising a main body made of rubber and a sealing surface facing a bottom portion of the joint groove, and A dry joint having a silicone rubber layer formed on the sealing surface. 2. The dry joint according to claim 1, wherein the main body and the silicone rubber layer are each crosslinked with an organic peroxide, and the bonding surfaces of the two are crosslinked. 3. The dry joint according to claim 1 or 2, wherein the main body is synthetic rubber. 4. The synthetic rubber according to claim 3, wherein the synthetic rubber is DC.
A dry joint containing P-based EPDM, chlorinated polyethylene or a mixture thereof. 5. The dry joint according to claim 4, wherein the main body contains the synthetic rubber and other added rubber components. 6. The additive rubber component according to claim 5, wherein the added rubber component is ENB EPDM, isoprene rubber (IR), butadiene acrylonitrile rubber (NBR), styrene butadiene rubber (SBR), chlorosulfonated polyethylene (CSM), or acrylic rubber. (ACM), Silicone rubber (Q), Fluorine rubber (FKM), Urethane rubber (U) One or more selected from the group, a dry joint. 7. The dry joint according to claim 1, wherein the silicone rubber layer is formed on the entire surface of the main body. 8. The dry joint according to claim 1, wherein the silicone rubber layer has a thickness of 0.5 mm to 1 mm. 9. An additive such as a rubber component, an organic peroxide cross-linking agent, and a reinforcing agent for producing a dry joint having a main body made of rubber and a sealing surface made of a silicone rubber layer facing the bottom of the joint groove. And a non-crosslinking mixture for sealing, which comprises a silicone polymer and an organic peroxide cross-linking agent, are prepared, and the non-crosslinking mixture for main body is formed into the shape of the main body of the dry joint. While molding
A method for producing a dry joint, comprising laminating the uncrosslinked mixture for sealing on the sealing surface, and then heating these in the presence of hot air. 10. The rubber for the main body according to claim 9, is a synthetic rubber, and the synthetic rubber is a DCP EPD.
A method for producing a dry joint, which comprises M, chlorinated polyethylene or a mixture thereof. 11. The rubber for the main body according to claim 10, comprising the synthetic rubber and additive rubber, wherein the additive rubber is ENB EPDM, isoprene rubber (IR), butadiene acrylonitrile rubber (NBR), styrene butadiene. One or more selected from the group of rubber (SBR), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM), silicone rubber (Q), fluororubber (FKM), urethane rubber (U) A method for producing a dry joint having a characteristic feature.