KR19990009718A - Heat-sealed rubber pad composition for automobile vibration damping material - Google Patents

Abstract

The present invention relates to a heat-sealed rubber pad composition for automobile vibration damping materials, and more particularly, to overcome the limitation of material selection of the vibration damper for automobile floors and to introduce a vulcanization system to improve the vibration damping characteristics and rigidity of the rubber pad at high temperatures. The present invention relates to a heat-sealed rubber pad composition for automobile vibration damping materials useful for reducing vibration of automobiles.

Description

Heat-sealed rubber pad composition for automobile vibration damping material

The present invention relates to a heat-sealed rubber pad composition for automobile vibration damping materials, and more particularly, to overcome the limitation of material selection of the vibration damper for automobile floors, and to introduce a vulcanization system to improve the vibration damping characteristics and rigidity of the rubber pad at high temperatures. The present invention relates to a heat-sealed rubber pad composition for automobile vibration damping materials useful for reducing vibration of automobiles.

Conventionally, when manufacturing rubber pads for vibration damping materials for automobiles, they are manufactured based on asphalt and inorganic fillers and are mainly made of material technology that exhibits vibration damping characteristics at room temperature. The manufacturing method had a limit of material selection because of the high temperature mixing of 150 ℃ with closed kneader. Looking at the conventional manufacturing process was combined with a heat-sealing anti-pad (anti-pad) on the car body floor panel and then installed a carpet damping material for the floor. However, the vibration damping material for the floor is showing a problem in the requirements of the vibration damping material for the automobile due to the increase in the room transfer temperature according to the high performance of the vehicle and the room temperature rise in the summer.

Therefore, in the present invention, to overcome the limitation of material selection by developing the first vibration damping material in Korea in order to improve the above problems, by introducing a vulcanization system and mixing at low temperature by using a mixing roll and open kneader on the asphalt foundation at high temperature The present invention has been completed for the purpose of providing a heat-sealed rubber pad composition for automobile vibration damping materials with improved vibration damping properties and rigidity.

The present invention relates to a rubber pad composition for vibration damping materials used in automobile floors, comprising: 20 to 25 wt% asphalt, 7 to 12 wt% butyl rubber, 50 to 65 wt% filler, 3 to 5 wt% resin, and 0.2 to calcium oxide It contains 0.4 wt%, process oil 0.2-0.5 wt%, zinc oxide 1.0-2.0 wt%, and sulfur vulcanizing agent 1.5-3.0 wt% as active ingredients, and heat sealing for automobile vibration damping materials that can be mixed and used at low temperatures. A rubber pad composition is featured.

The present invention will be described in detail as follows.

The self-adhesive heat-sealed rubber pad of the present invention contains components such as asphalt, butyl rubber, filler, resin, calcium oxide, process oil, zinc oxide and sulfur vulcanizing agent.

Asphalt is selected for the improvement of adhesion considering the adhesion to the vehicle body panel by improving the vibration damping performance and adhesion factor, and use 20 to 25% by weight. If the amount of asphalt used is less than 20% by weight, the workability is excellent, but the adhesion is remarkably poor, making practical use difficult, and if it exceeds 25% by weight, the softening point during open mixing is difficult to process.

Butyl rubber is used in an amount of 7 to 12% by weight for energy absorption capacity and compatibility with other components. If the butyl rubber is less than 7% by weight, it is difficult to fill the filler and adversely affect the processability. If it exceeds 12% by weight, the processability is excellent, but the glass transition temperature of the butyl rubber falls below -20 ℃, so the peak of the vibration damping coefficient It becomes difficult to achieve characteristics.

Filler is selected from calcium oxide or mica to use 50 to 65% by weight to maintain the shape of the pad and cost reduction. If the content of the filler is less than 50% by weight, the workability is excellent, but there is a problem of lowering the elasticity of the material, when the content exceeds 65% by weight, high elasticity can be maintained, but there is a problem of brittleness during processing.

Resin is a petroleum-based resin using 3 to 5% by weight, but if the amount is less than 3% by weight, there is a problem in adhesiveness when the amount is less than 3% by weight. There is.

Calcium oxide is used as an anti-foaming agent and contains 0.2 to 0.4% by weight. If the content of calcium oxide is less than 0.2% by weight, the dehumidification capacity is lowered. Can lower the quality.

The process oil contains 0.2 to 0.5% by weight for use as a process enhancer in rubber formulations. Since the process oil may reduce the elasticity of the product, it may contain only a small amount necessary. If the process oil is out of the above range, the compounding process of the high filler may be difficult or the elasticity of the product may be reduced.

Zinc oxide is 1.0 to 2.0% by weight as a vulcanization activator, which is not used in asphalt based formulations, and is mainly used as a vulcanization component used in rubber compounding. If the content of zinc oxide is less than 1.0% by weight, unvulcanized may occur. If the content of zinc oxide is more than 2.0% by weight, the storage property of the product may be shortened by reacting with the vulcanizing agent as compared to the amount of vulcanizing agent used.

Sulfur vulcanizing agents are used in rubber compounding in the manufacture of self-adhesive heat-sealing pads and contain 1.5 to 3.0% by weight. Sulfur vulcanizing agents improve the glass transition temperature of the high-fill material in rubber to the desired temperature and also enhance the elasticity of the product to improve the rigidity of the panel. If the content of the sulfur vulcanizing agent is less than 1.5% by weight, there is a problem in the stiffness reduction and shelf life of the product in the unvulcanized state, and when it exceeds 3.0% by weight, there is a problem of adhesion and breakage after application.

As described above, all compositions except sulfur vulcanizing agents were first mixed using an open kneader at a temperature of 100 ° C. and a stirring speed of 30 rpm, and the sulfur vulcanizing agent was mixed at a temperature of 70 ° C. and 30 rpm using a mixing roll. Was mixed to prepare a heat-sealed rubber pad having a thickness of 4.5 mm using a calender, and was fused to the vehicle body floor panel using a conventional method. Self-adhesive heat-sealed rubber pads, which are characteristic of this material selection and introduced vulcanization system, are useful in vulcanizing and curing at the high temperature (60 ° C) region to maximize vibration damping performance.

Although this invention is demonstrated in detail based on an Example, this invention is not limited to an Example.

Examples 1-2

The composition and the content of the following Table 1, using a vulcanization system, the temperature was about 100 ℃, the composition was first mixed using an open kneader with a stirring speed of 30 rpm. Then, sulfur vulcanizing agent was mixed by using a mixing roll at 70 ° C. at 30 rpm for 2 times to prepare a heat-sealed rubber pad.

Comparative Example 1

The composition and the content of the following Table 1 and the temperature was about 180 ℃, a stirring speed of 30 rpm to prepare a conventional thermal fusion pad by mixing the components in a transverse continuous mixer.

Unit: weight% Formulation Drug Example 1 Example 2 Comparative Example 1 Asphalt ⁽¹⁾ 22.0 24.0 40.0 Butyl Rubber ⁽²⁾ 10.0 8.0 - Filler Calcium carbonate 30.0 30.0 - Mica 30.0 30.0 - Clay - - 50.0 Resin ⁽³⁾ 4.0 4.0 3.0 Calcium oxide 0.3 0.3 2.0 Island oil ⁽⁴⁾ - - 4.0 Process Oils ⁽⁵⁾ 0.3 0.3 1.0 Zinc oxide 1.4 1.4 - Sulfur Curing Agents ⁽⁶⁾ 2.0 2.0 - (1) Penetration degree is 10-20 (2) Polysar 301 (3) PX 1150 (petroleum resin) (4) Wastewater self-production (5) 5B 2066, unchanged petroleum (6) S / DM Formulation) = used in weight ratio of 3/1

Experimental Example

Physical properties of the heat-sealed rubber pads prepared in Examples and the heat-sealed pads prepared in Comparative Examples were measured to measure specific gravity, vibration damping coefficient, flexural load, and adhesion, and the results are shown in Table 2 below.

Properties and Effects Example 1 Example 2 Comparative Example 1 Remarks importance 1.46 1.46 1.40 Panel 0.8 mm + sample 4.5 mm Damping Factor 20 ℃ 0.16 0.15 0.24 40 ℃ 0.30 0.35 0.10 60 ℃ 0.50 0.55 0.05 Flexural Load (㎏f) 17 17 8.5 Adhesiveness (%) 75 75 70

The present invention overcomes the limitation of material selection at high temperature, and it is understood that the introduction of a vulcanization system enables the manufacture of heat-sealed rubber pads even at low temperatures, thereby providing a self-adhesive heat-sealed rubber pads useful for vibration reduction of automobiles. Can be.

Claims (2)

Asphalt 20-25 wt%, Butyl rubber 7-12 wt%, Filler 50-65 wt%, Petroleum resin 3-5 wt%, Calcium oxide 0.2-0.4 wt%, Process oil 0.2-0.5 wt%, Zinc oxide 1.0 A heat-sealing rubber pad composition for automobile vibration damping materials, characterized in that it contains -2.0 wt% and sulfur vulcanizing agent 1.5-3.0 wt%. The heat-sealed rubber pad composition for automobile vibration damper according to claim 1, wherein the filler is calcium carbonate or mica.