KR101153916B1 - Composite of butyl rubber improved processability and moldability - Google Patents

Abstract

The present invention relates to a butyl rubber composition having improved processability and moldability, wherein a composite composition of white carbon and a softener is added to a butyl rubber composition, and the flowability of the butyl rubber composition is improved. It improves processability and formability, and it is excellent in dispersibility by using white carbon, unlike carbon black used in the past as filler of butyl rubber composition, and it improves the butyl rubber composition and improves the flowability of butyl rubber composition. Since air contained in the butyl rubber composition is easily removed during roll processing, blooming is prevented, and crosslinking is carried out at a high temperature / high pressure so that a phenomenon such as air bubbles does not occur during molding of the product, and additionally, It is possible to design products with improved wear resistance while maintaining traction and non-slip. As well as the soles of the flow may utilize a variety of materials that require abrasion resistance and nanseup miliary the demand is expected to increase significantly.

 Butyl Rubber, White Carbon, Softener, Composite Composition, Processability, Formability, Flowability, Blooming

Description

Butyl rubber improved processability and moldability

The present invention is a butyl rubber composition in which a composite composition of white carbon and a softener is added to a composition based on butyl rubber, which improves the flowability of the butyl rubber composition to improve processability which is vulnerable in roll processing, and removes bubbles in the butyl rubber composition. Improved processability and formability, which can reduce appearance defects by preventing air bubble phenomenon during molding, and additionally increase wear resistance and maintain non-slip property, which is an advantage of conventional butyl rubber. It relates to a butyl rubber composition.

In general, butyl rubber is a copolymer rubber containing isobutylene and a small amount of isoprene. Unlike ordinary rubber, butyl rubber has a low repulsive elasticity, has a very high saturation, and has excellent aging characteristics and non-slip characteristics. Due to its low permeability, it is mostly used for the tire industry, and only a part of butyl rubber production is used for the outsole for hiking boots using butyl rubber with excellent grip and slip resistance to climb slippery rock walls. There was a very vulnerable problem.

Since butyl rubber having the above characteristics is very slow in adhesiveness or deformability to deformation, adhesion occurs on the surface when processing on rotating rolls, making it difficult to process, or air is mixed during roll processing, and remains in the compound. Therefore, defects caused by air bubbles are frequently generated during molding, and the reaction time is weak due to the slow reaction time for the deformation of the compound. For this reason, the working time is long, the physical properties of the product is deteriorated, and the scorch phenomenon of the compound may occur due to the heat generated by the long time working. In addition, the butyl rubber compound has a low flowability, the defect rate of the product due to the generation of air bubbles during molding was very high. In the production site, in order to solve such defects, there is an inconvenience in going through an additional process of removing air during molding. In addition, the butyl rubber shows a property that the filler dispersibility is lower than that of general general rubber, there is a problem of mixing for a long time for dispersion.

Looking at the conventional patents that apply butyl rubber to the outsole for hiking boots, the method of manufacturing non-slip butyl rubber outsole of Korea Patent Publication No. 10-0739069 (registered on July 6, 2007) and Korea Patent Publication No. 10-0852972 Non-slip butyl rubber composition for climbing boots having both non-marking and non-slip properties (registered on August 12, 2008) and polybutene of Korean Patent Publication No. 10-0811610 (registered on March 8, 2008) Although rubber outsoles are known, the above patents are patents on the method of improving the slip resistance using butyl rubber as a base material, but the butyl rubber as described above can be improved even though the slip resistance of the hiking boots can be improved. There is still no workability or formability problem in the production field because there is no consideration of processability and formability.

The patents mentioned above simply improve the traction and non-slip properties of hiking boots, which can be easily solved by using the inherent properties of butyl rubber, but improving the wear resistance while maintaining the traction of the existing butyl rubber has yet to be described. There is no state. In addition, in the conventional patent technology, there is a technique of using a surfactant, processing oil, antistatic agent, silicone oil, etc. to improve filler dispersibility or processability in rubber, but in the case of butyl rubber, dispersibility of silica, which is a reinforcing filler, is particularly It is difficult to expect a sufficient effect with the content of the composition shown in the above patent with this falling material. On the other hand, the above problem may be solved by increasing the content of the softener, but when the content of the low molecular weight softener is high, blooming occurs in the product, and there is a problem in that mechanical strength or wear resistance is significantly reduced due to the decrease in the crosslinking degree.

Therefore, the present invention primarily improves the dispersibility of the white carbon as a filler by applying a composite composition carrying a low molecular weight softener to the white carbon and improves the dispersibility of the white carbon filler, and does not cause blooming to the product even when an excess softener is used. The present invention has been completed by having workability.

In order to solve the above problems, the present invention provides a butyl rubber base composition using a halogenated butyl rubber such as butyl rubber (IIR) and bromo butyl rubber (BIIR) or chlorinated butyl rubber (CIIR) alone or in combination. By uniformly dispersing and mixing a conventional rubber additive with a white carbon and a softener composite composition, the flowability of the butyl rubber composition is improved, thereby improving the processability and formability of the butyl rubber composition. It is a problem to provide a butyl rubber composition.

In addition, conventionally, as carbon black, which is a filler, is used to reinforce the strength of butyl rubber, carbon black is entangled during roll processing, and the dispersibility is low in the butyl rubber composition, so that the chemical bond with butyl rubber is not uniform and workability is poor. In addition, when white carbon is used alone, processability and dispersibility are poor due to the incompatibility between white carbon as an inorganic material and butyl rubber as an organic material, whereas the present invention uses a white carbon / softener composite. Another object of the present invention is to provide a butyl rubber composition having improved processability and moldability, which is characterized by excellent dispersibility in the butyl rubber composition, thereby improving the flowability of the butyl rubber composition while reinforcing the strength of the butyl rubber composition. .

In addition, according to the present invention, the composition of the butyl rubber base improves flowability, and thus, air contained in the butyl rubber composition is easily removed during roll processing, thereby preventing blooming, and crosslinking under high temperature / high pressure, thereby forming an air bubble. It is another object of the present invention to provide a butyl rubber composition having improved processability and moldability, which is characterized in that no defects such as (air bubble) occur so as to lower a defective rate of a product.

The present invention for solving the above problems in the butyl rubber composition consisting of a butyl rubber base, rubber additives, sulfur, vulcanization accelerator,

The butyl rubber composition is composed of 50 to 80 parts by weight of a white carbon and a softener composite composition with respect to 100 parts by weight of a butyl rubber base, and a butyl rubber composition having improved processability and moldability as a problem solving means.

The butyl rubber base is preferably used alone or in combination of butyl rubber (IIR), bromo butyl rubber (BIIR) or chlorinated butyl rubber (CIIR),

The composite composition of the white carbon and the softening agent is characterized in that to use 40 to 60 parts by weight of white carbon and 10 to 20 parts by weight of the softening agent was uniformly mixed for 30 to 60 minutes at a speed of 1000 ~ 2000rpm in a high speed stirrer.

As described above, the present invention is a method for improving the weak processability and formability of butyl rubber by using a white carbon / softener composite composition in the butyl rubber-based composition that occurs during the processability and molding of the existing butyl rubber composition It has been found to be very effective in improving defects. In addition, it is possible to design products with improved wear resistance while maintaining the grip strength and non-slip of the butyl rubber composition. It is expected to be.

Hereinafter, a preferred embodiment of the butyl rubber composition having improved processability and moldability according to the present invention for achieving the above effect, but in detail for the construction and operation that can be easily understood by those skilled in the general rubber composition manufacturing field References are briefly or omitted.

The butyl rubber composition according to the present invention for achieving the above effect is characterized in that the composite composition of white carbon and softener is added to a composition consisting of a conventional rubber additive such as a butyl rubber base and rubber additives, sulfur, and a vulcanization accelerator. In the present invention, the units 'parts by weight' expressed in terms of the content of various components are all calculated based on 100 parts by weight of the butyl rubber base.

The butyl rubber composition according to the present invention is a component such as rubber additives, sulfur and vulcanization accelerators, which are typically rubber additives added to the rubber composition, and the composition ratio thereof is not a feature of the present invention.

Therefore, the present invention in the butyl rubber composition consisting of a butyl rubber base, rubber additives, sulfur, vulcanization accelerator,

The butyl rubber composition is characterized by consisting of 50 to 80 parts by weight of a white carbon and a softener composite composition with respect to 100 parts by weight of a butyl rubber base.

And the rubber additive usually added to the rubber composition, based on 100 parts by weight of the butyl rubber base, 1 to 3 parts by weight of the silane coupling agent, 3 to 7 parts by weight of metal oxide, 0.5 to 2 parts by weight of stearic acid, 1 to 4 parts by weight of activator , 1.0 to 2.5 parts by weight of vulcanizing agent, 1.0 to 3.0 parts by weight of vulcanization accelerator is preferable, it should be noted that such rubber additives are not particularly different from the composition ratio added to the general rubber composition.

Referring to the configuration of the present invention in more detail as follows.

In the rubber used in the present invention, butyl rubber (IIR), bromo butyl rubber (BIIR) or chlorinated butyl rubber (CIIR) is used alone or in combination, and ML _{1 + 8} (125 ° C.) is 30 to 50, and unsaturated. A binding content of 0.5 to 2.0 mol% was used.

And the composite composition of the white carbon and the softener used in the present invention is a mixture of 40 to 60 parts by weight of white carbon and 10 to 20 parts by weight of the softener uniformly mixed for 30 to 60 minutes at a speed of 1000 ~ 2000rpm in a high speed stirrer using It is preferable.

The white carbon used in the present invention was used to improve the mechanical strength of the butyl rubber and to control the hardness, and a wet white carbon having a BET surface area of 100 to 350 m ² / g and a pH of 6.5 to 7.5 was used. If the content of the white carbon is less than 40 parts by weight, there may be a problem that the mechanical strength and hardness is lowered, if more than 60 parts by weight may increase the hardness and the problem of poor tackiness, which is an inherent property of butyl rubber. .

Conventionally, when carbon black, which is a filler, is used to reinforce the strength of butyl rubber, the carbon black is entangled during roll processing, and as the dispersibility in the butyl rubber composition is lowered, the processability is poor and white carbon is used alone. There is a problem that the compatibility between the white carbon and phosphorus butyl rubber is poor and the workability and dispersibility are reduced.

In the present invention, the softening agent used to improve the processability and formability of the butyl rubber is preferably 10 to 20 parts by weight. At this time, if the content of the softener is less than 10 parts by weight, the workability and moldability improvement effect is inferior. If the content is more than 20 parts by weight, there is a problem that not only the workability but also the low hardenability and mechanical strength and blooming occurs.

 Types of softeners usable in the present invention include oils, antistatic agents, surfactants, and silicone oils.

As the antistatic agent, a liquid and solid antistatic agent having a pH of 6 to 8 among nonionic antistatic agents, amine antistatic agents, fatty acid esters, cationic antistatic agents, and betain antistatic agents were used. Surfactants are nonionic surfactants such as lauryl alcohol ethylene oxide, nonylphenol ethylene oxide, oleyl alcohol ethylene oxide, tridecyl alcohol ethylene oxide, cocofetiside ethylene oxide, sorbitol laurate, laurylamine ethylene oxide, Ethylene oxide-propylene oxide, cocoamidopropylbetaine, distearydimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride as cationic surfactant, alkylbenzenesulfonic acid, alpha as anionic surfactant It is preferable to use one or more selected from olefin sulfonate, sodium dioctyl sulfosuccinate, sodium dodecyl benzene sulfonate, or ammonium-polyoxyethylene nonylphenyl disulfate.

Silicone softeners include dimethyl silicone oil, methylhydrogen silicone oil, methyl phenyl silicone oil, amino modified oil, epoxy modified oil, carboxyl modified oil, methacryl modified oil, carbinol modified oil, methacryl modified oil, mercapto Viscosity is 100 ~ 2000mm among modified oil, phenol modified oil, methyl styryl modified oil, alkyl modified oil, fatty acid ester modified oil, polyether modified oil, fluorine modified oil, hydrophilic modified oil, heterofunctional modified oil or single-ended reactive modified oil. It is preferable to select and use 1 type or more from ² / s of silicone oil. When the viscosity is out of the above range, degradation of workability and mechanical strength may occur.

As for the oils, naphthenic oil having a kinematic viscosity (40 ° C cst) of 30 to 60 and an aromatic oil having a kinematic viscosity (100 ° C cst) of 15 to 30 range were used.

As a crosslinking agent used in this invention, it is preferable to use 1.0-2.5 weight part of sulfur with respect to 100 weight part of base materials, and to use 1.0-3.0 weight part of vulcanization accelerators. At this time, the amount of sulfur used is less than 1.0 parts by weight and the molding time is long, productivity is lowered, mechanical strength is lowered, and blooming may occur at 2.0 parts by weight or more. In consideration of the crosslinking time, mechanical strength and wear resistance in the present invention, the amount of the appropriate crosslinking agent is preferably 1.0 to 2.5 parts by weight based on 100 parts by weight of the substrate. In addition, if the amount of the vulcanization accelerator is less than 1.0 parts by weight, the crosslinking rate is delayed. Therefore, the amount of the vulcanization accelerator used in the present invention is preferably 1.0 to 3.0 parts by weight based on 100 parts by weight of the substrate.

The crosslinking agent used in the present invention used sulfur (sulfur) and insoluble sulfur (Insoluble sulfur).

Referring to the manufacturing process of the butyl rubber composition consisting of the above composition components as follows.

First, a conventional rubber additive and white carbon are added to the base material, and then kneaded using a kneader or short-barrier mixer, and sulfur and a vulcanization accelerator are mixed in an open roll mill to prepare a compound.

In more detail, as described above, based on 100 parts by weight of butyl rubber, 40 to 60 parts by weight of white carbon, 10 to 20 parts by weight of softener, 1 to 3 parts by weight of silane coupling agent, 3 to 7 parts by weight of metal oxide, 0.5 to 2 parts by weight of stearic acid and 1 to 4 parts by weight of activator are kneaded in a kneader or short-barrier mixer at 100-120 ° C for 10-15 minutes, and the sulfur and vulcanization accelerator are mixed by mixing in an open roll. Is prepared in a sheet form.

The compound prepared according to the above method was vulcanized by using a heat press for 10 to 20 minutes at 150 to 160 ° C. under a high temperature and high pressure of 100 to 150 kg / cm ² .

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

1. Preparation of Butyl Rubber

The butyl rubbers of Examples 1 to 4 and Comparative Examples 1 to 4 were prepared according to the components and blending ratios described in the following [Table 1].

Example 1

Nieder as a compound kneader with 5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 70 parts by weight of white carbon / antistatic compound, 2 parts by weight of silane coupling agent, and 2 parts by weight of activator based on 100 parts by weight of bromo butyl rubber (BIIR) Compound was prepared by kneading at 100-120 ° C. for about 12 minutes. After completion of the kneader, the compound is prepared by mixing 2.0 parts by weight of sulfur and 2.2 parts by weight of vulcanization accelerator with respect to 100 parts by weight of the substrate in an open roll mill in which cooling water flows, and then mixing the sheet to form a sheet of 2 to 5 mm. The sheet-like compound thus prepared is introduced into a mold having a mold thickness of 3 to 5 mm, and then press-molded for about 15 minutes under press conditions of 160 ° C. and 120 kg / cm ² to prepare butyl rubber.

Example 2

Nieder as a compound kneader with 5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 60 parts by weight of white carbon / surfactant, 2 parts by weight of silane coupling agent, and 2 parts by weight of activator based on 100 parts by weight of bromo butyl rubber (BIIR) kneader) was kneaded at 100-120 ° C. for about 12 minutes to prepare a compound. After completion of the kneader, the compound is prepared by mixing 2.0 parts by weight of sulfur and 2.2 parts by weight of vulcanization accelerator with respect to 100 parts by weight of the substrate in an open roll mill in which cooling water flows, and then mixing the sheet to form a sheet of 2 to 5 mm. The sheet-like compound thus prepared is introduced into a mold having a mold thickness of 3 to 5 mm, and then press-molded for about 15 minutes under press conditions of 160 ° C. and 120 kg / cm ² to prepare butyl rubber.

Example 3

5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 60 parts by weight of white carbon / silicone oil composite, 2 parts by weight of silane coupling agent, and 80 parts by weight of bromo butyl rubber (BIIR) and 20 parts by weight of butyl rubber (IIR) The second part by weight was kneaded in a kneader, which is a compound kneader, at 100 to 120 ° C. for about 12 minutes to prepare a compound. After completion of the kneader, the compound is prepared by mixing 2.0 parts by weight of sulfur and 2.2 parts by weight of vulcanization accelerator with respect to 100 parts by weight of the substrate in an open roll mill in which cooling water flows, and then mixing the sheet to form a sheet of 2 to 5 mm. Butyl rubber is prepared in the same manner as in Example 1.

Example 4

5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 60 parts by weight of a white carbon / naphthenic oil composite, 2 parts by weight of a silane coupling agent, based on 45 parts by weight of bromo butyl rubber (BIIR) and 55 parts by weight of butyl rubber (IIR), 2 parts by weight of the activator was kneaded in a compound kneader (kneader) for 100 ~ 120 ℃, about 12 minutes to prepare a compound. After completion of the kneader, the compound is prepared by mixing 2.0 parts by weight of sulfur and 2.2 parts by weight of vulcanization accelerator with respect to 100 parts by weight of the substrate in an open roll mill in which cooling water flows, and then mixing the sheet to form a sheet of 2 to 5 mm. Butyl rubber is prepared in the same manner as in Example 1.

Comparative Example 1

5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 50 parts by weight of white carbon, 5 parts by weight of surfactant, 2 parts by weight of silane coupling agent, and 2 parts by weight of activator based on 100 parts by weight of bromo butyl rubber (BIIR) Compounds were prepared by kneading in a kneader at 100-120 ° C. for about 12 minutes. After completion of the kneader, the compound is prepared by mixing 2.0 parts by weight of sulfur and 2.2 parts by weight of vulcanization accelerator with respect to 100 parts by weight of the substrate in an open roll mill in which cooling water flows, and then mixing the sheet to form a sheet of 2 to 5 mm. The sheet-like compound thus prepared is introduced into a mold having a mold thickness of 3 to 5 mm, and then press-molded for about 15 minutes under press conditions of 160 ° C. and 120 kg / cm ² to prepare butyl rubber.

Comparative Example 2

5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 50 parts by weight of white carbon, 10 parts by weight of surfactant, 2 parts by weight of silane coupling agent based on 80 parts by weight of bromo butyl rubber (BIIR) and 20 parts by weight of butyl rubber (IIR). 2 parts by weight of the activator was kneaded in a compound kneader (kneader) at 100-120 ° C. for about 12 minutes to prepare a compound. After completion of the kneader, the compound is prepared by mixing 2.0 parts by weight of sulfur and 2.2 parts by weight of vulcanization accelerator with respect to 100 parts by weight of the substrate in an open roll mill in which cooling water flows, and then mixing the sheet to form a sheet of 2 to 5 mm. Butyl rubber is prepared in the same manner as in Comparative Example 1.

Comparative Example 3

5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 50 parts by weight of white carbon, 10 parts by weight of antistatic agent, and 2 parts by weight of silane coupling agent based on 45 parts by weight of bromo butyl rubber (BIIR) and 55 parts by weight of butyl rubber (IIR). 2 parts by weight of the activator was kneaded in a compound kneader (kneader) for 100 ~ 120 ℃, about 12 minutes to prepare a compound. After completion of the kneader, the compound is prepared by mixing 2.0 parts by weight of sulfur and 2.2 parts by weight of vulcanization accelerator with respect to 100 parts by weight of the substrate in an open roll mill in which cooling water flows, and then mixing the sheet to form a sheet of 2 to 5 mm. Butyl rubber is prepared in the same manner as in Comparative Example 1.

Comparative Example 4

5 parts by weight of zinc oxide, 1 part by weight of stearic acid, 50 parts by weight of white carbon, 15 parts by weight of antistatic agent, and 2 parts by weight of silane coupling agent based on 70 parts by weight of bromo butyl rubber (BIIR) and 30 parts by weight of butadiene rubber (BR). , 2 parts by weight of the activator was kneaded in a compound kneader (kneader) for 100 ~ 120 ℃, about 12 minutes to prepare a compound. After completion of the kneader, the compound is prepared by mixing 2.0 parts by weight of sulfur and 2.2 parts by weight of vulcanization accelerator with respect to 100 parts by weight of the substrate in an open roll mill in which cooling water flows, and then mixing the sheet to form a sheet of 2 to 5 mm. Hereinafter, butyl rubber is prepared in the same manner as in Comparative Example 1.

Ingredient Example Comparative example One 2 3 4 One 2 3 4
Rubber Butyl fluoride rubber ¹⁾ 100 100 80 45 100 80 45 70 Butyl Rubber ²⁾ - - 20 55 - 20 55 - Butadiene rubber ³⁾ - - - - - - - 30 Zinc oxide ⁴⁾ 5 5 5 5 5 5 5 5 Stearic acid ⁵⁾ One One One One One One One One White Carbon ⁶⁾ / Surfactant ⁷⁾ Composite Composition 60/10 - - - 50 50 50 50 White Carbon ⁶⁾ / Antistatic Agent ⁸⁾ Composite Composition - 50/10 - - - - - - White Carbon ⁶⁾ / Silicone Oil ⁹⁾ Composite Composition - - 50/15 - - - - - White Carbon ⁶⁾ / Naphthenic Oil ¹⁰⁾ Composite Composition - - - 40/20 - - - - Surfactant ⁷⁾ - - - - 5 10 - - Antistatic agent ⁸⁾ - - - - - - 10 15 Activator ¹¹⁾ 2 2 2 2 2 2 2 2 Silane coupling agent ¹²⁾ 2 2 2 2 2 2 2 2 Vulcanizer ¹³⁾ 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 Vulcanization Accelerator-I ¹⁴⁾ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Vulcanization Accelerator-II ¹⁵⁾ One One One One One One One One Vulcanization Accelerator-III ¹⁶⁾ One One One One One One One One week)

1) Exonmobil BIIR 2244
2) Exonmobil IIR 268
3) Kumho Petrochemical, KBR 01
4) PJ Chemtech, Zinc oxide (Rubber use No. 1)
5) LG Chem, stearic acid
6) Rhodia, Zeosil 175
7) Miwon Corporation, surfactant
8) Miwon Corporation, Antistatic Agent
9) Shinetus, Silicone Oil
10) Michang Petroleum Co., Ltd., Naphthenic Oil
11) Green Soft Chem, PEG4000
12) Deggusa, Si-69
13) Taekwang Chemical, sulfur
14) Taekwang Chemical, TS
15) Taekwang Chemical, DM
16) Taekwang Chemical, M

2. Evaluation of Butyl Rubber

The results of evaluating the properties of the butyl rubber prepared according to Examples 1 to 4 and Comparative Examples 1 to 4 according to the following test methods are shown in the following [Table 2].

Evaluation item unit Example Comparative example One 2 3 4 One 2 3 4 Hardness Asker A 68 67 68 69 68 68 69 69 The tensile strength kg / cm ² 165 168 155 145 170 160 150 120 Phosphorus strength kg / cm 65 70 65 63 70 68 65 55 NBS % 200 180 180 150 60 55 50 100 Slip μ 1.57 1.59 1.61 1.62 1.6 1.63 1.65 1.2 Processability ○ ○ ○ ○ × × △ ○ Blooming The presence or absence radish radish radish radish radish U U U ^* Defective rate ¹⁾ % 2 2 2 2 10 10 7 5

Note 1) ^* Defective rate: Airscotch occurrence rate

3. Evaluation Items

1) Hardness: measured using ASTM D2240 method.

2) Tensile strength, tear strength: measured by ASTM D412, ASTM D624 method.

3) Wear resistance (NBS): The wear resistance was measured as follows using an NBS wear tester (ASTM D1630).

NBS (%) = Number of times required to wear 1 mm of specimen / Number of times required to wear 1 mm of standard rubber × 100

4) Slip (dynamic) was measured using a dynamic slip tester (ASTM 1894).

5) Processability: The roll workability of the compound and the adhesion to the surface were evaluated.

6) Blooming: After 72 hours in 70 ℃, 95% humidity oven

7) Defective rate: The presence or absence of air bubble in vulcanized rubber after molding was evaluated.

As shown in [Table 1] and [Table 2], Examples 1 to 4 prepared a butyl rubber composition using a white carbon / softener composite composition. On the other hand, Comparative Examples 1 to 4 prepared butyl rubber compositions in which white softeners were added to each other without pretreatment of the softeners. The strength was compared.

In Examples 1 and 2, bromo butyl rubber (BIIR) was used as a substrate, and the characteristics of the softener in the white carbon / softener composite composition were examined by changing the type of softener. Compared with 1, the workability was improved and the defect rate of vulcanized rubber by air bubble was significantly reduced. In addition, in the above results, Examples 1 and 2 were relatively high in the softener content, but blooming did not occur, and workability and moldability were also improved. On the other hand, in the case of Comparative Example 2, although the content of the softener was used in the same amount as in Examples 1 and 2 by 10 parts by weight, blooming occurred in the product.

Examples 3 and 4 further increased the content of the softener in the white carbon / softener composite composition to 15 parts by weight on the substrate mixed with bromo butyl rubber (BIIR) and butyl rubber (IIR), but no blooming occurred. On the other hand, in Comparative Examples 3 and 4, the workability and the defective rate were somewhat improved, but the blooming occurred in the product.

In addition, it can be seen from the above results that the mechanical strength and wear resistance of the product were improved due to the effect of improving the dispersibility and processability of the butyl rubber and the filler when the white carbon / softener composite composition was used. In particular, the composition of 4 compared butadiene effective in abrasion resistance blended, but in the wear resistance, the example using 100% of the existing butyl rubber showed a good wear characteristics rather.

As described above, the present invention has been proved to be excellent in processability and physical properties through the above embodiments, but the present invention is not necessarily limited only by the above configuration, and various modifications may be made without departing from the technical spirit of the present invention. Substitutions, modifications and variations are possible.

Claims (8)

In the butyl rubber composition comprising a butyl rubber base, rubber additives, sulfur, vulcanization accelerator, The butyl rubber composition is composed of 50 to 80 parts by weight of a white carbon and a softener composite composition with respect to 100 parts by weight of a butyl rubber base, The butyl rubber substrate is used alone or in combination of butyl rubber (IIR), bromo butyl rubber (BIIR) or chlorinated butyl rubber (CIIR), The white carbon and softener composite composition is composed of 40 to 60 parts by weight of white carbon and 10 to 20 parts by weight of softener, The softener is a butyl rubber composition having improved processability and moldability, characterized in that one or more selected from oils, antistatic agents, surfactants or silicone oils. delete delete delete The method of claim 1, The oils are butyl improved processability and formability, characterized in that using a naphthenic oil having a kinematic viscosity (40 ℃ cst) 30 ~ 60 or an aromatic oil having a kinematic viscosity (100 ℃ cst) 15 ~ 30 Rubber composition. The method of claim 1, The antistatic agents improve the processability and formability, characterized in that one or more selected from among nonionic antistatic agents, amine antistatic agents, fatty acid esters, cationic antistatic agents or betaine antistatic agents are used. Butyl rubber composition. The method of claim 1, The surfactant is a nonionic surfactant, such as lauryl alcohol ethylene oxide, nonylphenol ethylene oxide, oleyl alcohol ethylene oxide, tridecyl alcohol ethylene oxide, cocofetiside ethylene oxide, sorbitol laurate, laurylamine ethylene oxide, Ethylene oxide-propylene oxide, cocoamidopropylbetaine, distearydimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride as cationic surfactant, alkylbenzenesulfonic acid, alpha as anionic surfactant Improved processability and moldability, characterized in that one or more selected from among olefin sulfonate, sodium dioctyl sulfosuccinate, sodium dodecyl benzene sulfonate or ammonium-polyoxyethylene nonylphenyl issurate Butyl rubber composition. The method of claim 1, The silicone oils include dimethyl silicone oil, methylhydrogen silicone oil, methylphenyl silicone oil, amino modified oil, epoxy modified oil, carboxyl modified oil, methacryl modified oil and carbinol having a viscosity of 100 to 2000 mm ² / s. Modified oil, methacryl modified oil, mercapto modified oil, phenol modified, methylstyryl modified oil, alkyl modified oil, fatty acid ester modified oil, polyether modified oil, fluorine modified oil, hydrophilic modified oil, heterofunctional modified oil or Butyl rubber composition with improved processability and moldability, characterized in that one or more selected from the one-ended reactive modified oil.