JPH04253786A - Composite sealing material - Google Patents

Abstract

PURPOSE:To provide a composite sealing material with excellent sealing properties, weatherability and appearance. CONSTITUTION:A composite sealing material prepd. by performing composite molding of a vinyl chloride resin compd. (A) and a compd. (B) which contains a vinyl chloride resin, a nitrile rubber and a plasticizer and wherein the ratio of incorporation of the nitrile rubber is 5-65 pts.wt. to 100 pts.wt. sum of the vinyl chloride resin, the nitrile rubber and the plasticizer.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sealing material with excellent sealing properties, weather resistance and appearance.

0002

[Prior Art] Conventionally, molded products such as plastics and rubber have been used as sealing materials in the fields of civil engineering and construction, automobiles, etc., for sealing windows, doors, etc., and for sealing interior materials, exterior materials, and joints between these materials. It is widely used for seals, etc., and these sealing materials are required to have good sealing properties, weather resistance, appearance, etc. As the material for the sealing material, generally used are soft or hard blends of vinyl chloride resin, ethylene-propylene-diene monomer copolymer (EPDM) vulcanizates, and the like.

[0003] However, molded products for sealing materials obtained using vinyl chloride resin compounds have excellent weather resistance, can be colored in vivid colors, and can be adjusted in gloss level. It has good appearance such as less bleeding of compounded ingredients, and it is possible to reproduce the small and sharp shapes of molds in the molded product, and it is possible to obtain thin molded products. It is also good.

However, vinyl chloride resins have the disadvantage of poor sealing properties. Further, although vulcanized EPDM has a good sealing effect, it has low weather resistance and an unsatisfactory appearance, and is also complicated in that it requires a vulcanization process for the molded product.

Therefore, when weather resistance and appearance are important, a vinyl chloride resin sealing material is used, and when sealing performance is important, a vulcanized EPDM sealing material is used.

However, in many cases, both of these properties are required, that is, sealing properties comparable to that of vulcanized EPDM, and appearance and weather resistance comparable to vinyl chloride resins are required. At that time, there is no single material that satisfies these performance requirements, so it is necessary to use a combination of EPDM and vinyl chloride resin in one part.

However, while vinyl chloride resin is a thermoplastic polymer molding method, EPDM has a completely different molding process, such as a vulcanized rubber molding method, and the polarity of the polymer is also significantly different. Therefore, it is extremely difficult to combine the two. For example, even if an attempt was made to bond the two together with an adhesive, there was no suitable adhesive available. Therefore, an improvement has been desired since it requires time-consuming operations such as caulking and fixing with a jig after molding each piece separately.

As described above, to date, no composite sealing material has been obtained that has excellent sealing properties, weather resistance, and appearance and can be manufactured without requiring complicated operations or processes.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art described above and to provide a composite sealing material with excellent sealing properties, weather resistance, and appearance.

0010

[Means for Solving the Problems] The inventors of the present invention have investigated the drawbacks of various methods, and have solved the problems by composite molding of a vinyl chloride resin compound, a thermoplastic elastomer composition whose main components are vinyl chloride resin, nitrile rubber, and a plasticizer. The present inventors have discovered that the composite molded product obtained can achieve the above-mentioned objects as a sealing material, and have completed the present invention.

That is, the present invention comprises a vinyl chloride resin compound (A), a vinyl chloride resin, a nitrile rubber, and a plasticizer, and the proportion of the nitrile rubber is equal to or greater than the vinyl chloride resin, the nitrile rubber, and the plasticizer. This is a composite sealing material formed by composite molding of 5 to 65 parts by weight of compound (B) based on a total of 100 parts by weight of plasticizer.

The present invention will be explained in detail below. The composite sealing material of the present invention is a composite molded product obtained by composite molding of the above formulations (A) and (B). Note that the composite molded product may be a composite product obtained by molding mixtures (A) and (B) at the same time, or a composite product obtained by molding either mixture (A) or (B) first and then molding the other. Although a composite molded product obtained by molding and combining the two may be used, a composite molded product obtained by simultaneous molding is particularly preferable.

[0013] Furthermore, the composite molded product can have two or more layers (A) formed by heat-molding the compound (A), and each layer is formed by heat-molding the compound (A) with the same or different composition. It can be anything. Further, the case of the layer (b) obtained by heat molding the compound (B) is the same as the case of the layer (b) obtained by heat forming the above-mentioned compound (A).

Furthermore, the composite sealing material of the present invention is characterized by its overall shape, the shape of each layer (a) and layer (b), whether these layers are continuous layers or discontinuous layers, and whether each of these layers is There are no restrictions on the proportion, the combination of layers (a) and (b) in the molded product for sealing material, or the positional relationship such as which of layers (a) or (b) forms the surface of the molded product. The positions of these layers in the molded product for sealing material are preferably selected depending on the performance required of the molded product as a sealing material.

[0015] The composite sealing material of the present invention may be partially or entirely porous, or may be hollow inside. Furthermore, for reinforcement, one or two types of reinforcing materials such as members such as metal or plastic inserts, organic or inorganic fibers or cloth are added.
It is also possible to combine two or more types and embed a part or the whole in a molded product for a sealing material.

The composite sealing material of the present invention can be produced by, for example, (1) introducing two or more types of materials such as plastics into a set of common dies using two or more extruders;
A multilayer coextrusion method in which materials are brought into contact with each other inside the die or at the die opening to obtain a single multilayer composite molded product, ■
Place the insert or preformed molded product into another mold,
Insert molding method or double shot injection method, which uses one or more injection molding machines to fill one or more types of materials to obtain a single multilayer molded product, ■Injection using two or more machines Sandwich injection molding method that uses a molding machine to fill a mold with two or more materials at different injection timings to obtain a single multilayer molded product.■ First, a multilayer parison with a closed bottom is formed by injection molding. A multilayer injection blow molding method in which the mold is directly transferred to a blow mold and air is blown to obtain a multilayer molded product. ■ Two or more sheets obtained using two or more calendar molding machines or T-die molding machines. A lamination method in which the sheets are stacked together and each sheet is bonded with heat fusion or adhesive to obtain a single multilayer sheet. ■The composite sheet obtained in step ■ above is heated to soften it, and then pressurized. Alternatively, a multilayer molded product can be obtained by bringing the product into close contact with a mold using vacuum, or a combination of these methods can be used.

The method to be used for molding can be selected depending on, for example, the shape and structure of the molded product to be obtained, the properties of the compounds (A) and (B) used, etc. can.

The shape of the composite sealing material of the present invention is not particularly limited, and can be applied to any shape generally used as a sealing material.

[0019] Vinyl chloride resin compound used in the present invention (
A) is a vinyl chloride resin blended with appropriate amounts of plasticizers, fillers, lubricants, stabilizers, colorants, foaming agents, etc., depending on the performance of the desired molded product, and is a so-called soft,
Includes formulations such as hard.

The compound (A) may be, for example, a mixture of vinyl chloride resin and other components, heated and kneaded to form a pellet or the like, or a mixture of vinyl chloride resin and other ingredients such as a filler. A powder mixture obtained by a dry blending method in which components are mixed and heated if necessary can be used, but in order to obtain a homogeneous blend (A), the former pellet form is preferable.

The vinyl chloride resin used to obtain the above-mentioned compound (A) preferably contains 30% by weight or more of vinyl chloride units, more preferably 50% by weight or more. As the vinyl chloride resin,
For example, resins obtained by polymerizing vinyl chloride, resins obtained by copolymerizing vinyl chloride and one or more monomers copolymerizable with it, chlorinating these resins, or using these resins as a backbone. Post-modified resins such as graft polymers,
Examples include resins that have polyurethane or olefin-fatty acid vinyl ester copolymers as their backbones and graft-polymerize vinyl chloride onto these. To obtain the formulation (A) of the present invention, the above-mentioned resins can be used alone or in combination of two or more.

The monomer copolymerizable with vinyl chloride is not particularly limited as long as it is copolymerizable, but examples include fatty acid vinyl esters (vinyl acetate, vinyl propionate, vinyl versatate, etc.), alkyl (meta)
Acrylates [methyl (meth)acrylate, ethyl (meth)acrylate, 2-ethylhexyl acrylate, etc.], olefins (ethylene, propylene, etc.)
, monomers with two polymerizable double bonds (diallyl phthalate, etc.), monomers with carboxylic acid (acrylic acid, crotonic acid, maleic acid and its anhydride, fumaric acid, etc.), vinylidene halides ( (vinylidene chloride, vinylidene fluoride, etc.), vinyl fluoride, acrylonitrile,
Examples include alkyl vinyl ethers.

[0023] The formulation (A) used in the present invention may contain a plasticizer if necessary. The plasticizer contained in the compound (A) is not particularly limited as long as it can be used as a plasticizer for vinyl chloride resins, and examples include phthalate esters, trimellitic acid esters, pyromellitic acid esters, Examples include plasticizers such as aliphatic polybasic acid esters, glycol esters, fatty acid esters, phosphoric acid esters, and citric acid esters, as well as polyester plasticizers.

Next, the compound (B) used in the present invention contains a vinyl chloride resin, nitrile rubber (hereinafter referred to as NBR), and a plasticizer, and the proportion of NBR is higher than that of the vinyl chloride resin. Total of resin, NBR and plasticizer: 100
5 to 65 parts by weight, preferably 10 to 65 parts by weight
Parts by weight are preferred. If the proportion of NBR is less than 5 parts by weight, the sealing properties of the composite sealing material obtained by heat molding will not be sufficient, and if it exceeds 65 parts by weight, the moldability will decrease.

[0025] The vinyl chloride resin and plasticizer used in the blend (B) can be the same as those used in the blend (A), and the proportion of the plasticizer to be contained in the blend (B) is , vinyl chloride resin contained in formulation (B) 100
It is preferably 20 to 300 parts by weight, particularly preferably 40 to 250 parts by weight.

NBR contained in the formulation (B) used in the present invention is preferably used in which the amount of bound acrylonitrile is 20 to 45% by weight, preferably 25 to 45% by weight. This NBR can be used even if it has one or more types of copolymerized units other than acrylonitrile and butadiene units. Further, this NBR may be either uncrosslinked or crosslinked, but crosslinked NBR
BR is preferable. NBR comes in various shapes such as powder, granules, and blocks, and can be used without any shape restrictions. NBR is preferred.

Furthermore, as the compound (B) in the present invention, a vinyl chloride resin, NBR, a curing agent, etc. as disclosed in JP-A-2-124958 are kneaded at a high temperature, for example, 140 to 220°C. A thermoplastic elastomer composition formed by reacting a curing agent and having a blending ratio of NBR within the range of formulation (B) in the present invention can be suitably used.

[0028] As the curing agent that can be incorporated into the compound (B) used in the present invention, curing agents used for curing or vulcanization of rubber can be used.

Satisfactory curing agents are the customary (sulfur + vulcanization accelerator) systems, such as those based on peroxides, azides, maleimides or phenolic resins.

Specific examples of curing agent components include sulfur,
Zinc oxide, magnesium oxide, organic peroxide, triazinethiol, benzothiazole sulfenamide accelerator, benzothiazyl disulfide, phenolic resin,
These include m-phenyllene bismaleimide, thiuram disulfide, dipentamethylenethiuram hexasulfide, and the like.

Examples of preferred organic peroxide curing agents are lauryl peroxide, benzoyl peroxide, bis-2,4-dichlorobenzoyl peroxide, dicumyl peroxide, ditertiary butyl peroxide, 2,5-dimethyl -2,5-bis(tert-butylperoxy)hexane, 1,1-bis(tert-butylperoxy)-2,3,5-trimethylcyclohexane, tris-α,α-dimethyl-α-(tert-butylperoxy) butylperoxy)methylbenzene, α,α-bis(butylperoxy)diisopropylbenzene, bis(4-tert-butylcyclohexyl)peroxydicarbonate, tert-butylperbenzoate, and the like.

Examples of preferable phenolic resin curing agents include reactive alkylphenol-formaldehyde resins and reactive brominated alkylphenol-formaldehyde resins.
Examples include OL 201 and TACKIPOL 250 (both manufactured by Sumitomo Chemical Co., Ltd.).

Other examples of accelerators include aldehyde ammonias, aldehyde amines, guanidine, thioureas, thiazoles, dithiocarbamates, xanthates, and thiurams.

Furthermore, as an auxiliary agent for these curing reactions,
For example, dibenzo-p-quinone dioxime, p-quinone dioxime, p-phenylene bismaleimide, trialkyl cyanurate, ethylene glycol dimethacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, neopentyl glycol diacrylate, etc. Can be used.

The amount of the curing agent contained in the blend (B) varies depending on the type of curing agent and the combination with the accelerator, but 0.000 parts by weight per 100 parts by weight of NBR contained in the blend (B). The amount is preferably from 0.003 to 3 parts by weight, particularly preferably from 0.005 to 1 part by weight.

Fillers can be added to the formulations (A) and (B) used in the present invention. As a filler,
Examples include carbon black, calcium carbonate, titanium oxide, talc, asbestos, aluminum hydroxide, magnesium hydroxide, clay, silica, and white carbon, and these may be used alone or in combination of two or more.

It is also possible to blend resins other than vinyl chloride resins, rubbers other than nitrile rubber, etc. into the compounds (A) and (B) for modification. Examples of the above resins and rubbers that can be blended include polyurethane, acrylic resin, methacrylic resin, ABS resin, and MBS.
Resin, nylon, polychloroprene, EPDM, modified E
Examples include PDM. These can be used alone or in combination of two or more.

Furthermore, formulations (A) and (
B) includes stabilizers against heat and ultraviolet rays, processing aids,
Appropriate amounts of lubricants, coloring agents such as pigments and dyes, flame retardants, foaming agents, etc. can be added as necessary.

As the heat stabilizer, for example, lead-based heat stabilizers such as tribasic lead sulfate, tin-based heat stabilizers such as dibutyltin malate, metal soaps such as zinc stearate, calcium stearate, etc. can be used. .

As processing aids, those commonly used for vinyl chloride resins, such as low molecular weight polyethylene and higher fatty acid esters, can be used.

Among the colorants, examples of pigments that can be used include color carbon black, chrome yellow, titanium oxide, and phthalocyanine green.

The composite sealing material of the present invention can be widely used, for example, in glass run channels as sealing materials around automobile windows, weather strips, door stop packings, gaskets for building materials, and the like.

[0043]

EXAMPLES The present invention will be explained by Examples and Comparative Examples, but the present invention is not limited thereto. In addition, what is simply described as "parts" below indicates parts by weight.

Example 1 ○ Production of compound (A) Vinyl chloride resin

100 copies (Denka Vinyl SH-2
50, average degree of polymerization = 2500, manufactured by Denki Kagaku Kogyo Co., Ltd.) Plasticizer DOP

100 copies (Sensocizer DOP
, manufactured by Shin Nippon Rika Co., Ltd.) Ba-Zn fatty acid salt composite stabilizer
Part 3 (BZ-100J,
(manufactured by Katsuta Kako Co., Ltd.) Epoxidized soybean oil

3 parts (ADEKASIZER O-130P, manufactured by ADEKA ARGUS)
calcium carbonate

50 parts (NS-400, manufactured by Nitto Funka Kogyo Co., Ltd.) Black pigment

1.5 parts (TXH-02
68, manufactured by Dainichiseika Co., Ltd.)

Based on the above formulation, each substance was put into a pressure kneader (capacity 3.5 liters, manufactured by Moriyama Seisakusho), which is an internal mixer, and the front roll 51
revolutions/min, rear roll 34 revolutions/min, jacket temperature 16
The mixture was kneaded at 0° C. for 5 minutes to obtain a gelled mixture. The obtained mixture was sheeted to a thickness of approximately 5 mm using a 10-inch roll preset at 160°C, and this was cut into a grid shape using a sheet pelletizer to form a sheet of approximately 3 m.
A m-square pellet was obtained.

○ Production of compound (B) Vinyl chloride resin

100 copies (Denka Vinyl SH-2
50, average degree of polymerization = 2500, manufactured by Denki Kagaku Kogyo Co., Ltd.) Ba-Zn fatty acid salt composite stabilizer

Part 3 (BZ-100J, manufactured by Katsuta Kako Co., Ltd.)

Epoxidized soybean oil

3 parts (Adeka Sizer O-130P, manufactured by Adeka Argus Chemical Co., Ltd.)
calcium carbonate

50 parts (NS-400, manufactured by Nitto Funka Kogyo Co., Ltd.) NBR

70 copies (
Chemi Gum P8B1A2, cross-linked product, powder, manufactured by Gutdeyer) Plasticizer DOP

70 parts (Sansocizer DOP, manufactured by New Japan Chemical Co., Ltd.) Black pigment


1 part (TXH-0268, manufactured by Dainichiseika Co., Ltd.)

0
[047] Based on the above formulation, each substance was mixed in a pressure kneader (capacity 3.5 liters, manufactured by Moriyama Seisakusho), which is an internal mixer.
The mixture was kneaded for 10 minutes at a jacket temperature of 170° C. with a front roll of 51 revolutions/minute and a rear roll of 34 revolutions/minute to obtain a gelled mixture. The resulting mixture was sheeted to a thickness of about 5 mm using a 10-inch roll preset at 170° C., and this was cut into squares using a sheet pelletizer to obtain pellets about 3 mm square.

○ Manufacture of composite molded product The compounds (A) and (B) obtained as described above were each fed into two 40 mm extruders, and the die temperature was 1.
Coextrusion was carried out at 70°C to obtain a two-layer coextruded sheet. The thickness of the blend (A) layer (upper layer) was 0.5 mm, and the thickness of the blend (B) layer (lower layer) was 3.5 mm.

The obtained sheet did not peel off at the interface between the two layers. The upper layer of this sheet had a beautiful black gloss and no surface bleeding occurred. The evaluation results are also listed in Tables 1 and 2.

Examples 2 to 5 and Comparative Examples 1 to 3 Same as Example 1 except that the formulation (B) having the composition shown in Table 1 was used instead of the formulation (B) used in Example 1. A composite molded article was obtained. In Comparative Example 1, a single-layer molded product with a thickness of 4 mm consisting only of the compound (A) used in Example 1 was obtained using a single-layer sheet extruder.

Evaluation of these molded products was carried out in the same manner as in Example 1, and the results are also shown in Tables 1 and 2. ○ Evaluation of composite molded product Physical properties were evaluated by the following method. The results are also listed in Table 2.

(1) Appearance Observation was made visually. ○: The color is vivid and glossy. △: The color is a little dull and there is not much luster. ×: The color is dull and there is no luster.

(2) Compression set (Cs) JIS K 6
Measured in accordance with 301. Compression rate 25%, temperature 80℃
, time 120 hours.

(3) Use a weather-resistant sunshine weather meter (no watering),
Black panel temperature 8 for the surface made of compound (A)
The state of the surface was visually observed after 400 hours of irradiation at 3°C. ○: Almost no discoloration. △: Slightly discolored. ×: Items whose surface has changed color and are no longer available.

(4) Processability Observation was made visually. ○: The surface is smooth and the shape matches the cap. △: The surface is a little uneven and the shape is a little bad. ×: The surface is uneven and does not come out according to the shape of the cap.

[0056]

[Table 1]

[0057]

[Table 2]

(Note) *1 Vinyl chloride resin Denka Vinyl SH-250, average degree of polymerization = 2500,
Denki Kagaku Kogyo *2 Chemi Gum P8B1A2 Gutdeyer, powder NBR, Mooney value 79, bound acrylonitrile 33%, crosslinked *3 JSR PN-30A Nippon Gosei Rubber Co., powder NBR, Mooney value 56, bound acrylonitrile 35%, uncrosslinked Type *4 DOP Di-2-ethylhexyl phthalate, Shin Nippon Rika Co., Ltd., Sansocizer DOP *5 Ba-Zn stabilizer Ba-Zn fatty acid salt composite stabilizer, BZ-100J, Katsuta Kako Co., Ltd. *6 Epoxidized soybean oil Adeka Argus Chemical Co., Ltd., Adeka Sizer O-130P*
7 Calcium carbonate Nitto Funka Kogyo Co., Ltd., NS-400 *8 Black pigment Dainichiseika Co., Ltd., TXH-0268 *9 Perhexa 3M-40 Nihon Yushi Co., Ltd., peroxide, 1,1-ditert-butylperoxy-3, 3,5-trimethylcyclohexane*
10 Triallylisocyanurate Kurogane Kasei Co., Ltd. *11 Content ratio of NBR to 100 parts by weight of vinyl chloride resin, NBR, and plasticizer in blend (B).

Example 6 The same formulation as formulation (B) used in Example 1 was stirred at high speed using a Henshil mixer, and the temperature was raised to 130°C to dry up. The obtained powder is 65mm
A pellet-like compound (B) was obtained by molding using an extruder equipped with a φ full-flight screw. In addition, the formulation (A
) was the same as in Example 1.

○ Manufacture of composite molded product For two 65 mmφ extruders, extruder-1 and extruder-2, extruder-1 of the co-extrusion molding apparatus is equipped with one die for two-layer irregular co-extrusion. Blend (A) was also transferred to extruder-2.
The layer (A) obtained by heating and molding the mixture (A) and the layer (B) formed by heating and molding the mixture (A) and the mixture (B) by heating and molding the mixture (B) and the mixture (B) respectively at the temperature conditions shown in Table 3 below. Naru layer (b)
An elongated composite molded product with a hollow interior and whose cross-sectional shape is shown in FIG. 1 was obtained.

FIG. 1 is a cross-sectional view taken at right angles to the longitudinal direction of an elongated molded product, 3 in the figure indicates a hollow portion, and the cross-sectional sizes are t1 = 1 mm, t2 = 4 mm,
t3 = 5mm, D1 = 20mm, D2 = 20mm
It is.

[0062]

[Table 3]

Comparative Example 4 An EPDM compound having the following composition was prepared using a roll, and then fed into a ribbon shape into a 65 mmφ extruder, and was heated to a cylinder temperature of 100°C to form an EPDM compound having the same shape as shown in FIG. 1 alone. A molded product was obtained.

Further, this EPDM molded product was steam-vulcanized at 160° C. for 20 minutes to obtain an EPDM vulcanized molded product. This EPDM vulcanized molded product was evaluated in the same manner as in Example 6. The results are shown in Table 4.

EPDM EP-103AF

100 parts (EPDM made by Japan Synthetic Rubber Co., Ltd.) FEF carbon

150 parts (carbon black manufactured by Mitsubishi Chemical Corporation,
Diamond black H) PW-90

90 parts (paraffin oil manufactured by Idemitsu Kosan) ZnO#1

5 parts stearic acid

1 part PEG#4000

Part 3 (manufactured by Sanyo Chemical) CML#21

5 parts (manufactured by Ohmi Kasei) Accelerator M

0.8 parts (manufactured by Ouchi Shinko Chemical) Accelerator Cz

0.8 parts (manufactured by Ouchi Shinko Chemical) Accelerator TT

0.8 parts (manufactured by Ouchi Shinko Chemical) Accelerator TRA

0.8 parts (manufactured by Ouchi Shinko Chemical) Accelerator BZ

1.0 part (manufactured by Ouchi Shinko Chemical) Sulfur (powder)

0.8 parts (manufactured by Hosoi Chemical Industry Co., Ltd.)

[0066]

[Table 4]

(Note) Compression set (Cs*) of composite molded product
The measurements were made using the molded products shown in Figure 1, each with a height of 20 mm.
It was compressed by 5 mm using a 15 mm thick spacer (ie, 25% compression ratio) and left at 80° C. for 120 hours. Then, from the height value of the sample after weight removal, the normal JIS
It was calculated using the calculation method of the following formula, which is the same as the measurement of compression set (Cs) of K 6301.

[0068]

[Math 1]

From the results in Table 4, it can be seen that the molded product of Example 6 has the appearance and weather resistance of the soft vinyl chloride resin of the outer compound (A), and the compression set (Cs) comparable to that of the inner vulcanized EPDM. The combination of the compound (B) has the advantage that the molded product has both good weather resistance, good appearance, and good sealing properties, and that the molded product can be easily obtained by coextrusion.

Test Example 1 In the composite sealing material of the present invention, a test was conducted to determine that the sealing property was determined by the system containing vinyl chloride resin, NBR, and a plasticizer as main components as compound (B). A formulation containing the vinyl chloride resin of Example 1, NBR and a plasticizer (
A sheet was created using B), the vinyl chloride resin blend of Comparative Example 1, and the EPDM of Comparative Example 4, and the compression rate was 25%.
The compression set (Cs) was measured at 80° C. for 120 hours. The results are shown in Table 5.

[0071]

[Table 5]

[0072] From the results in Table 5, the composition (B) containing vinyl resin, NBR, and plasticizer in the present invention has a compression set value that is approximately equal to or lower than that of vulcanized EPDM, and therefore, it is difficult to seal. It has good properties and can be used in place of vulcanized EPDM.

[0073]

Effects of the Invention As explained above, the present invention can be obtained by heat molding a vinyl chloride resin compound (A) and a vinyl chloride resin compound (B) containing a specific proportion of nitrile rubber. consisting of a molded product, the molded product having at least (A
Since the composite sealing material has both the layer (a) obtained by heat-forming the material (a) and the layer (b) obtained by heat-forming the material (B), it is possible to obtain a composite sealing material with excellent sealing properties, weather resistance, and appearance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the composite sealing material of the present invention.

[Explanation of symbols]

1 Layer (A) formed by heating and molding the compound (A) 2
Layer (B) 3 formed by heating and molding the compound (B) Hollow portion

Claims (1)

[Claims] Claim 1: A vinyl chloride resin compound (A) containing a vinyl chloride resin, nitrile rubber, and a plasticizer, and the proportion of the nitrile rubber being the total of the vinyl chloride resin, nitrile rubber, and plasticizer. 5 to 100 parts by weight
A composite sealing material formed by composite molding with 65 parts by weight of compound (B).