JPH083324A - New method for rubber curing - Google Patents

Abstract

PURPOSE:To provide a method for rubber curing capable of giving a rubber excellent in flexibility, high-temperature creep resistance, low-temperature impact resistance and mechanical strength, presenting excellent rubber elasticity over a wide temperature range, also good in oil resistance and free to make a toning, therefore, favorably applicable, through rubber molding, to automotive parts, home appliance parts or food packaging each hopeful of improving their oil resistance, rubber elasticity, mechanical strength, molding rate, molding yield, freedom of toning, etc. CONSTITUTION:This method for rubber curing is such that (a) 100 pts.wt. of a double bond-contg. rubber is incorporated with 0.5-30 pts.wt. of an organosiloxane-based crosslinking agent having two or more SiH groups and (c) 0.001-20 pts.wt. of a hydrosilylating catalyst and, where needed, furthermore, (d) 30-300 pts.wt. of a paraffin-based oil, followed by conducting a crosslinking.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel rubber curing method. More specifically, it has excellent flexibility, rubber elasticity over a wide temperature range, high temperature creep performance, low temperature impact resistance, mechanical strength, molding processability, oil resistance, light discoloration resistance, and excellent color matching. Further, the present invention relates to a method for producing a novel elastomer which has excellent biocompatibility and can be used as a raw material for various molded products including food applications and medical applications.

[0002]

2. Description of the Related Art A vulcanizing agent having the ability to chemically bond to rubber in order to reduce the plasticity of rubber, improve tensile strength, tear strength, elasticity, and reduce thermal change and wear of rubber. Let it harden. The vulcanizing agent is a sulfur (including an accelerator) vulcanizing agent, a peroxide vulcanizing agent, a resin vulcanizing agent, an oxime vulcanizing agent, a metal oxide vulcanizing agent, an amine vulcanizing agent, Examples of the ionic vulcanizing agent include sulfur vulcanizing agents and peroxide vulcanizing agents. Sulfur-based vulcanizing agents are the most common and include various vulcanization accelerators, reinforcing agents,
Low cost, high elasticity and low creep properties have been obtained by combining vulcanization accelerating aids and the like, and are used in the fields of automobile parts, home electric appliance parts, wire coating materials, sundries, footwear and the like. However, in the case of a sulfur-based vulcanized elastomer, there is a problem that heat resistance stability cannot be said to be sufficient, and unbonded compounds bloom to deteriorate the appearance and aging resistance of the molded product. Furthermore, since a reinforcing agent such as carbon black is used, there is no degree of freedom in coloring, and it cannot be used for food applications and medical applications that require biocompatibility. On the other hand, the peroxide type vulcanizing agent is
In particular, it is used as a curing method for saturated rubber that cannot be vulcanized with sulfur, and is intended to improve mechanical properties, heat resistance, and electrical properties. This curing method is extremely hygienic and can be used for food applications. However, since it is partially cross-linked, it has insufficient oil resistance and shape recoverability at high temperatures, and therefore cannot be used for various applications over a wide range. Also, since organic peroxide is used,
At the same time as cross-linking, there is also a drawback that the polymer chain is broken by radicals derived from the organic peroxide and the mechanical strength is lowered. Furthermore, a heat-reactive alkylphenol resin can be used as the resin-based vulcanizing agent.
Since the elastomer obtained by this curing method is completely crosslinked, it has sufficient oil resistance and shape recoverability at high temperatures, but since it uses an alkylphenol resin, its light resistance is extremely poor and the degree of freedom in toning is required. It cannot be used for applications such as automobile parts, home appliance parts, and wire coating. Furthermore, since the phenol monomer remains, it cannot be used for food applications and medical applications where hygiene is poor and biocompatibility is required.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems that have been difficult with conventional rubber compositions, and it is possible to maintain good rubber properties over a wide temperature range while maintaining low-temperature impact resistance. It has a wide range of applications including color matching, hygienic properties, and long-term reliability because it has characteristics such as high heat resistance, wide coloring freedom, and low residue. The present invention provides a rubber curing method that can be performed.

[0004]

[Means for Solving the Problems] As a vulcanizing agent, a compound having excellent heat resistance, light discoloration resistance, biocompatibility, and properties of selectively cross-linking rubber was searched for.
Applications in which an organoorganosiloxane compound having two or more groups is suitable for the above purpose, and toning is required by curing the rubber with a hydrosilylation catalyst to cause a crosslinking reaction at a practical reaction rate. It has been found that it can be used in a wide variety of applications including those requiring hygiene and long-term reliability. As a result of further development of various researches, as a result, it has a wide range of various applications including impact resistance at low temperature, toning and good molding appearance while having good rubber properties over a wide temperature range. The inventors have found the finding that they can be applied, and based on this finding, they have further advanced various studies and completed the present invention. That is, the present invention is characterized in that the unsaturated double bond-containing rubber (a) is cross-linked with an organic organosiloxane cross-linking agent (b) having two or more SiH groups in the molecule and a hydrosilylation catalyst (c). The method for curing the rubber is preferably 0.5 to 30 parts by weight of the organic organosiloxane cross-linking agent (b) and 100 parts by weight of the unsaturated double bond-containing rubber (a), and a hydrosilylation catalyst ( c) is added in an amount of 0.001 to 20 parts by weight, and paraffinic oil (d) is added in an amount of 30 to 3 if necessary.
This is a method for curing a rubber, characterized in that 100 parts by weight of the rubber is added and crosslinked.

The unsaturated carbon double bond group-containing rubber (a) used in the present invention is not particularly limited, and generally commercially available rubbers containing unsaturated carbon double bond in the main chain and / or side chain. Refers to. For example, ethylene-
α-olefin-non-conjugated diene copolymer rubber, polybutadiene, polyisoprene, natural rubber, styrene-butadiene random copolymer rubber, styrene-isoprene random copolymer rubber, styrene-butadiene block copolymer rubber, styrene-isoprene An acrylonitrile-butadiene copolymer rubber most frequently used as a block copolymer rubber or an α, β-unsaturated nitrile-conjugated diene copolymer rubber is exemplified. Further, a partially hydrogenated rubber in which an aliphatic double bond contained in these rubbers is partially hydrogenated to reduce the degree of unsaturation can also be used. For example, a partially hydrogenated rubber having a hydrogenation ratio of less than 80% may be used. These rubbers may be one kind or a blend of two or more kinds. Here, the ethylene-α-olefin-non-conjugated diene copolymer rubber consisting of ethylene, α-olefin and non-conjugated diene is suitable in that α-olefin having 3 to 15 carbon atoms in its composition. As the non-conjugated diene, dicyclopentadiene, 1,4-hexadiene, ethylidene norbornene, methylene norbornene and the like can be used. In the present invention, polypropylene is suitable as the α-olefin from the viewpoint of easy availability and improvement of impact resistance. Therefore, EPDM is preferred. The copolymer rubber has an ethylene / α / olefin ratio of 50/50 by weight.
90/10, and more preferably 60/40 to 80/20 are suitable. Here, the Mooney viscosity of the rubber used, ML1 +
4 (100 ° C) is 10 to 120, preferably 40 to 10
It can be suitably selected from the range of 0. If the Mooney viscosity is less than 10, preferable crosslinking cannot be obtained, and improvement of compression set at high temperature cannot be expected, which is not preferable. Further, if it exceeds 120, the moldability is remarkably deteriorated and the appearance of the molded product is deteriorated, which is not preferable. Further, the iodine value of this rubber is 5 to 30, especially 10 to 10.
20 is preferable.

Next, the rubber crosslinking agent (b) used in the present invention is an organic organosiloxane compound having two or more SiH groups. This crosslinking method utilizes a selective addition reaction (hydrosilylation) of SiH groups to unsaturated hydrocarbons in a rubber component. In order to be a cross-linking agent, addition to two or more molecules of rubber is a necessary condition, so it is necessary to have two or more SiH groups in the molecule. Typical examples of specific compounds are compounds having structures of cyclic polysiloxanes, linear polysiloxanes, and tetrahedral siloxanes as shown below. Moreover, you may use the compound and / or polymer derived from this compound. Here, m is an integer of 3 to 30, n is an integer of 0 to 200, R is hydrogen, an alkyl group, an alkoxy group, an aryl group or an aryloxy group, and is bonded to a silicon atom. Two or more silicon atoms in which at least one R is hydrogen are present in the molecule. The organic organosiloxane having the above structure can selectively crosslink rubber.

The crosslinking reaction catalyst (c) used in the present invention refers to all catalysts that accelerate the hydrosilylation reaction. Examples of the catalyst include group transition metals such as palladium, rhodium and platinum, or compounds and complexes thereof.
Further, peroxides, amines and phosphines are also used. In addition, ultraviolet rays and γ rays can also be used. The most common catalysts include dicuclobis (acetonitrile) palladium (II), chlorotris (triphenylphosphine) rhodium (I), chloroplatinic acid and the like. An organic peroxide catalyst can be preferably used as the crosslinking reaction catalyst (c) used in the present invention. Examples of organic peroxides are 2,5-dimethyl 2,5-di (t-butylperoxy) hexane and 2,5-dimethyl 2,5-di (t-butylperoxy) hexyne-3,1, 3-bis (t-butylperoxyisopropyl) benzene, 1,1-di (t
-Butylperoxy) 3,5,5 trimethylcyclohexane, 2,5 dimethyl 2,5 di (peroxybenzoyl) hexyne 3, and dicumyl peroxide.
Furthermore, a system in which an organic peroxide is used in combination with a co-catalyst bismaleimide compound may be used as a catalyst. The bismaleimide compound used in the present invention includes N, N'-m-phenylene bismaleimide and toluylene bismaleimide. N, N'-m-phenylene bismaleimide is commercially available, for example, HVA-2 (manufactured by DuPont), Succinol B.
M (Sumitomo Chemical Co., Ltd.) or the like can be used. The temperature at which the catalyst performance of the peroxide-based catalyst develops can be freely controlled between 100 ° C and 250 ° C by examining the catalyst species. That is, by performing the raw material dispersion step and the molding step at a temperature at which the catalyst activity is exhibited or lower, and the vulcanization step at a temperature at which the catalyst ability is exhibited or higher, molding processing can be performed in the same manner as a normal vulcanized rubber. The cured rubber composition obtained by using this peroxide catalyst can be suitably used in applications where residual heavy metals pose a problem-for example, in the medical field. Further, in order to disperse the catalyst in a higher degree, the hydrosilylation catalyst (c) can be dissolved or supported in one or more kinds selected from a liquid component and a solid component. That is, it is a method of dissolving it in a solvent, supporting it on an inorganic filler, or a combination of both. The solvent used here is not particularly limited, but needs to be relatively inert to the hydrosilylation reaction. Examples of the solvent type include hydrocarbon type, alcohol type, ketone type, ester type and the like. The concentration of the solution to be adjusted is not particularly limited. Further, the inorganic filler is required to have adsorption ability, and examples thereof include calcium carbonate, carbon black, talc, magnesium hydroxide, mica, barium sulfate, natural silicic acid, rigid silicic acid (white carbon), titanium oxide and the like. As a method for adjusting the supported catalyst, a known method can be used.

The term "cured rubber composition" as used herein means that 1 g of the composition obtained in the present invention is refluxed with boiling xylene in a Soxhlet extractor for 10 hours, and the residue is filtered through a wire mesh of 80 mesh to obtain a mesh. The ratio of the dry weight (g) of the insoluble matter remaining in the composition to the weight of the component a contained in 1 g of the composition is 1
A gel content of at least 80%, expressed as a value multiplied by 00,
It is preferably vulcanized so as to have a content of 90% or more (however, insoluble components such as inorganic filler are not included therein). In order to obtain such a cured rubber composition, the amount of the organoorganosiloxane cross-linking agent b is 0.5 to 30 parts by weight, preferably 1 to 20 parts by weight, based on 100 parts by weight of the component a. It can be chosen and its gel content can be adjusted. The amount of catalyst c added is 1 for rubber component.
It is possible to optionally add 0.001 to 20 parts by weight of catalyst to 100 parts by weight. The addition amount of the heavy metal catalyst as a catalyst is preferably 0.005 to 5 parts by weight, more preferably 0.01 to 2 parts by weight. The addition amount of the peroxide catalyst is preferably 0.01 to 15 parts by weight, more preferably 0.1 to 10 parts by weight. When the amount is less than 0.001 part by weight, the crosslinking does not proceed at a practical speed. Further, if it exceeds 20 parts by weight, not only is there no effect of increasing the amount, but also the deactivated catalyst becomes black-colored lumps and the appearance is poor, and heat treatment tends to cause undesirable side reactions (decomposition of unreacted SiH groups, etc.). is there.

Paraffinic oil (d) used in the present invention
Has an effect of adjusting the hardness of the obtained composition and giving flexibility, and is added as necessary. Mineral oil type rubber softening agents called process oils or extender oils, which are generally used for softening, increasing volume and improving processability of rubber, are a mixture of aromatic ring, naphthene ring and paraffin chain. Paraffin chains have 50% or more of the total number of carbon atoms are called paraffins, and those with 30 to 45% naphthene ring carbons are naphthenes, and aromatics with more than 30% aromatic ring carbons. It is considered a system.
The oils used in the present invention are preferably paraffinic oils in the above categories, and naphthenic and aromatic oils are not preferable in terms of dispersibility and solubility. The paraffinic rubber softener has a kinematic viscosity of 20 to 50 at 37.8 ° C.
0 cst, pour point -10 to -15 ℃ and flash point 1
70-300 degreeC is shown. The preferable blending amount of the paraffinic oil (d) is 3 with respect to 100 parts by weight of the rubber component (a).
0 to 300 parts by weight, more preferably 30 to 25
0 parts by weight. If the composition exceeds 300 parts by weight,
It tends to cause bleeding out of the softening agent, may cause tackiness in the final product, and tends to deteriorate mechanical properties. Further, if it is less than 30 parts by weight, it is meaningless to add it.

In addition to the above-mentioned components, the rubber-cured product of the present invention may further contain an inorganic filler, if necessary, especially for applications in which color matching is unnecessary. This inorganic filler has not only the advantage of reducing the product cost as an extender but also an advantage of imparting a positive effect to quality improvement (heat-resistant shape retention, flame retardancy impartation, etc.). Examples of the inorganic filler include calcium carbonate, carbon black, talc, magnesium hydroxide, mica, barium sulfate, natural silicic acid, synthetic silicic acid (white carbon), titanium oxide, etc., and carbon black includes channel black, Furnace black etc. can be used. Among these inorganic fillers, talc and calcium carbonate are economically advantageous and preferable. Further, if necessary, an external lubricant, an internal lubricant, a hindered amine-based light stabilizer, a hindered phenol-based antioxidant, a colorant, silicone oil and the like may be added.

The method for producing the cured rubber component (e) using the above components (a), (b), (c), and (d) is not particularly limited, and may be a conventional thermosetting resin composition or a thermosetting resin composition. All the general methods used for producing a curable rubber composition can be adopted. Basically, it is a mechanical melt-kneading method, and a single-screw extruder, a twin-screw extruder, a Banbury mixer, various kneaders, brabenders, rolls and the like are used for these. At this time, the temperature for melt-kneading can be suitably selected from the range of 180 ° C to 300 ° C and the shear rate of 100 to 1000 / SEC. The hardened rubber particles (e) produced through the above steps can be crushed to have an average particle diameter of 3 mm or less by an ordinary crushing method. That is, a crusher, particularly a freeze crushing method using dry ice or liquid nitrogen is preferably used. Further, an inorganic filler or the like can be used as a powdering agent. In addition to the components described above, a nucleating agent, an external lubricant, an internal lubricant, a hindered amine light stabilizer, a hindered phenol antioxidant, a colorant, silicone oil, etc. may be added, if necessary. It is also possible to blend other thermoplastic resins such as styrene block copolymer (SBC), ethylene-α-olefin copolymer, and thermoplastic urethane resin that do not impair the characteristics. As a method for producing the composition of the present invention, all general methods used for producing ordinary resin compositions and rubber compositions can be adopted. Basically it is a mechanical melt kneading method,
A single-screw extruder, a twin-screw extruder, a Banbury mixer, various kneaders, a brabender, a roll, etc. are used for these. At this time, the addition order of each component is not limited, for example, rubber, resin components are premixed in advance with a mixer such as a Henschel mixer, a blender and melt-kneaded with the above kneader, and then a crosslinking agent and a catalyst component are added. When the scorch time of the rubber to be added and used is sufficiently long, it is possible to adopt an addition method in which components other than the catalyst are melt-kneaded in advance, and then a catalyst is added and melt-kneaded. At this time, the temperature for melt-kneading is 20 to 30 ° C or lower than the curing temperature, that is, 100 ° C to
It can be suitably selected from 150 ° C. and a shear rate of 100 to 1000 / SEC. The elastomer composition obtained here is thermosetting and can be molded by using a thermosetting resin molding machine generally used, and various molding methods such as injection molding, compression molding, transfer molding and the like. Is applicable.

[0012]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The components blended in the examples and comparative examples shown below are as follows. <Component a (1)> ethylene-propylene-ethylidene norbornene copolymer rubber manufactured by Nippon Synthetic Rubber Co., Ltd. EP57C [propylene content: 2
8 wt% Mooney viscosity ML1 + 4 (100 ° C): 90 Iodine number: 15 Tg: -40 ° C] <Component a (2)> Acrylonitrile-butadiene copolymer rubber N240S manufactured by Nippon Synthetic Rubber Co., Ltd. [acrylonitrile content: 26 wt% Mooney viscosity ML1 + 4 (100 ° C): 5
6] <Component a (3)> Styrene-butadiene copolymer rubber JSR 1503 manufactured by Nippon Synthetic Rubber Co., Ltd. [Styrene content: 23.5 wt% Mooney viscosity ML1 + 4 (100 ° C):
75] <Component a (4)> Butyl rubber JSR Butyl 268 manufactured by Nippon Synthetic Rubber Co., Ltd. [unsaturation: 1.5 mol% Mooney viscosity ML1 + 4 (125 ° C.):
51] <Component b (1)> 1,3,5,7-tetramethylcyclotetrasiloxane manufactured by Toray Dow Corning Silicone Co., Ltd. <Component b (2)> 1,1,3,3-tetramethylditetra Siloxane Toray Dow Corning Silicone Co., Ltd. <Component c (1)> Chloroplatinic acid hexahydrate Yasuda Chemical Co., Ltd. <Component c (2)> Dicumyl peroxide Nippon Oil & Fat Co., Ltd. Park Mill D < Component c (3)> A 1 wt% 2-propanol solution of component c (1) was prepared, and 1 g of this solution was carried on 100 g of silica (Nipsil VN3 manufactured by Nippon Silica Co., Ltd.) to prepare. <Component d> Paraffin-based process oil manufactured by Idemitsu Kosan Co., Ltd. Diana Process Oil PW-380
[Kinematic viscosity: 381.6 cst (40 ° C), 30.1 (10
0 ° C.), average molecular weight 746, ring analysis value: CA = 0%,
CN = 27%, CP = 73%]

<< Examples 1 to 24 and Comparative Examples 1 to 18 >>
After sufficiently dry-blending the components a, b, c and d, they were melt-kneaded using a kneader under the condition that the resin temperature was 100 to 150 ° C. The melt-kneaded product was switched to a roll for thinning, and then compression molding was performed at 190 ° C. by a vulcanization molding press. The following physical properties were evaluated, the examples are listed in Tables 1 to 4, and the comparative examples are listed in Table 5.
I put it on ~ 7. The evaluation method is as follows. (1) Hardness (JIS K6301 A type) (2) Tensile strength TS [MPa] and elongation Eb [%] (JI
SK6301, No.3 dumbbell) (3) Compression set CS [%] (JIS K6301, 2
5% compression 70 ° C x 22 hours (4) Low temperature impact resistance (-60 x 75 x 75 x t1 test piece
After immersing in a dry ice-methanol solution at 10 ° C. for 10 minutes, a DuPont drop ball impact test was performed. When no cracks were found after the test, it was marked with ◯, and when cracks were found, it was marked with x. [Test conditions Weight: 500g Tip sphere R: 3/16 Drop height: 1m] (5) Oil resistance [%] (JIS K6301, No3 test oil (lubricating oil) is used, and 70 ° C for 2 hours. , 50 × 50 × t
The test piece of No. 2 was dipped, and the weight change (%) before and after the dipping was obtained. (6) Light discoloration resistance test (natural composition was used at 88 ° C x 1000h using a sunshine weather ometer.
r processing was performed and the color difference was measured. (7) Hygiene test (The test was carried out in accordance with the Japanese Pharmacopoeia 10th revised rubber stopper test method for infusions and the plastic container test method for infusions. × was unsuccessful, and ○ was good. )

In Comparative Examples 1 to 6, the rubber was cured in the same manner as in Examples except that 2 parts by weight of an organic peroxide [dicumyl peroxide (DCP)] and 3 parts by weight of divinylbenzene (DVB) were used. Made by way. Further Comparative Examples 7-12
In rubber curing, heat-reactive alkylphenol resin [Sc
henectady Chemicals SP1045] was used in the same manner as in Example except that 5 parts by weight of 2 parts by weight of a crosslinking aid [stannous chloride] was used. Further, in Comparative Examples 13 to 18, rubber was cured by using a sulfur-based vulcanizing agent in the same manner as in Examples.
The sulfur-based vulcanizing agent in the comparative examples is 5 parts by weight of zinc oxide, 1 part by weight of tetraethylthiuram disulfide, 0.5 parts by weight of 2-bis (benzothiazolyl) disulfide, and sulfur 1. 5 parts by weight of vulcanizing agent master. From these results, the rubber cured with the organoorganosiloxane compound of the present invention is more excellent in mechanical strength, compression set at 70 ° C. and oil resistance than the rubber composition cured with the organic peroxide cross-linking agent. It became clear to give. Further, it has been found that the composition of the present invention has good resistance to light discoloration, and thus has a high degree of freedom in toning and is excellent in hygiene.

Table 1 Example 1 2 3 4 5 6 Composition (parts by weight) Component a (1) 100 100 100 100 100 100 100 Component b (1) 3 3 6 3 Component b (2) 3 3 Component c (1) 0.5 0 .5 0.5 0.5 0.5 0.5 0.5 Component d 100 200 200 280 280 100 Physical properties Hardness 61 58 58 49 49 44 57 TS (MPa) 19 18 14 13 19 19 19 Eb (%) 625 590 625 510 510 605 615 CS (%) 27 29 29 24 24 23 24 Low temperature impact resistance ○ ○ ○ ○ ○ ○ Oil resistance (%) 15 9 15 9 9 14 15 Light discoloration resistance 8 7 8 8 9 8 Hygiene test ○ ○ ○ ○ ○ ○

Table 2 Example 7 8 9 10 11 12 Composition (parts by weight) Component a (2) 100 100 Component a (3) 100 100 Component a (4) 100 100 Component b (1) 3 3 3 Component b (2) 3 3 3 Component c (1) 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Component d 100 100 100 100 100 100 100 Physical Property Hardness 63 57 57 59 62 62 59 TS (MPa) 16 17 18 18 19 17 20 Eb (%) 620 540 620 580 610 540 CS (%) 24 22 23 23 29 31 38 Low temperature impact resistance ○ ○ ○ ○ ○ ○ Oil resistance (%) 12 9 13 13 14 12 Photochromic resistance 9 8 8 9 8 9 Hygiene test ○ ○ ○ ○ ○ ○

Table 3 Example 13 14 15 16 17 18 Composition (parts by weight) Component a (1) 100 100 100 100 100 100 100 Component b (1) 3 3 6 3 Component b (2) 3 3 Component c (2) 0.2 0 .2 0.2 0.2 0.2 0.2 0.2 component d 100 200 190 280 100 100 100 Physical properties Hardness 61 57 62 62 64 61 57 TS (MPa) 15 14 17 18 14 19 19 Eb (%) 600 595 610 580 630 550 CS (%) 30 31 31 24 24 29 27 Low temperature impact resistance ○ ○ ○ ○ ○ ○ Oil resistance (%) 14 13 14 12 15 15 13 Light discoloration resistance 8 9 8 10 9 9 Hygienic test ○ ○ ○ ○ ○ ○

Table 4 Example 19 20 21 22 23 24 Composition (parts by weight) Component a (1) 100 100 100 100 100 100 100 Component b (1) 3 3 6 3 Component b (2) 3 3 Component c (3) 10 10 10 10 10 10 component d 100 200 190 280 100 100 100 physical properties hardness 61 57 62 62 64 61 57 TS (MPa) 15 14 17 18 18 14 19 Eb (%) 600 600 600 610 580 630 550 CS (%) 28 28 27 28 22 22 27 25 low temperature resistance Impact resistance ○ ○ ○ ○ ○ ○ Oil resistance (%) 13 12 12 11 15 13 Light discoloration resistance 8 9 8 10 9 9 Hygiene test ○ ○ ○ ○ ○ ○

Table 5 Comparative Example 1 2 3 4 5 6 Composition (parts by weight) Component a (1) 100 100 100 100 100 Component a (2) 100 100 DVB 3 3 3 3 3 3 DCP 2 2 2 2 2 2 component d 100 200 190 280 100 280 Physical properties Hardness 60 56 57 57 58 59 56 TS (MPa) 11 12 9 10 12 8 Eb (%) 510 480 500 430 490 480 CS (%) 35 40 40 42 39 41 Low temperature impact resistance × × × × × × × Oil resistance (%) 18 19 22 13 19 12 Light discoloration resistance 8 7 8 9 9 8 Hygiene test ○ ○ ○ ○ ○ ○

Table 6 Comparative Example 7 8 9 10 11 12 Composition (parts by weight) Component a (1) 100 100 100 100 100 Component a (2) 100 100 SP1045 5 5 5 5 5 5 5 stannous chloride 2 2 2 2 2 2 component d 100 200 190 280 100 100 280 Physical properties Hardness 60 55 55 57 58 59 59 56 TS (MPa) 18 17 14 12 12 20 20 Eb (%) 620 600 630 510 510 600 620 Low temperature impact resistance × × × × × × CS (%) 27 30 27 35 34 38 Oil resistance (%) 14 10 16 9 14 9 Light discoloration resistance 28 27 30 29 29 29 28 Hygienic test × × × × × ×

Table 7 Comparative Example 13 14 15 16 17 18 Composition (parts by weight) Component a (1) 100 100 100 100 Component a (2) 100 100 Yellow vulcanizing agent 4 4 4 4 4 4 Component d 100 200 200 190 280 100 280 Physical properties Hardness 60 56 61 61 62 63 62 S (MPa) 18 17 18 18 19 20 17 Eb (%) 530 500 550 530 500 500 520 CS (%) 35 32 39 39 42 44 36 Low temperature impact resistance × × × × × × Oil resistance ( %) 14 9 15 13 14 15 15 Light discoloration resistance 28 27 28 28 29 29 28 Hygiene test × × × × × ×

[0022]

The elastomer composition obtained by the curing method of the present invention is excellent in flexibility, heat-resistant creep performance, low-temperature impact resistance, mechanical strength, shows excellent rubber elasticity over a wide temperature range, and further has oil resistance. It has good properties and free toning, so it is desired to improve oil resistance, rubber elasticity, mechanical strength and molding speed, molding yield, degree of freedom of toning, etc. , Sheath) and various industrial parts. further,
Since it has excellent hygiene, it can be applied to food and medical applications.

Claims (6)

[Claims] 1. An unsaturated double bond-containing rubber (a) is crosslinked with an organic organosiloxane cross-linking agent (b) having two or more SiH groups in the molecule and a hydrosilylation catalyst (c). How to cure the rubber. 2. An organic organosiloxane cross-linking agent (b) based on 100 parts by weight of an unsaturated double bond-containing rubber (a).
0.5 to 30 parts by weight and hydrosilylation catalyst (c)
The method for curing rubber according to claim 1, wherein 0.001 to 20 parts by weight is added. 3. Paraffin oil (d) is added in an amount of 30 to 30 to 100 parts by weight of the unsaturated double bond-containing rubber (a).
The rubber curing method according to claim 1 or 2, including 0 part by weight. 4. The rubber curing method according to claim 1, 2 or 3, wherein the hydrosilylation catalyst (c) is a heavy metal catalyst and / or a peroxide catalyst. 5. The method for curing rubber according to claim 1, wherein the hydrosilylation catalyst (c) is dissolved or supported in one or more kinds selected from liquid components and solid components. 6. The unsaturated double bond-containing rubber (a) is an ethylene-α-olefin-non-conjugated diene copolymer rubber, vinyl aromatic compound-conjugated diene compound copolymer rubber, butadiene rubber, butyl rubber, α. , Β-unsaturated nitrile-
The method for curing a rubber according to claim 1, 2, 3, 4, or 5, which is a conjugated diene copolymer rubber or an acrylic rubber.