KR20070053009A - The composition for anti vibration material - Google Patents

Abstract

The present invention relates to a vibration damping material composition, and more particularly, a binder containing 1,2-polybutadiene and isobutylene, an inorganic filler, a fiber filler, and quicklime are mixed to cover the bottom surface of an automobile. The present invention relates to a vibration damping sheet that absorbs noise and vibration generated by power sources such as other home appliances, and improves the low heat resistance of the conventional asphalt-based vibration damping sheet, reduces vibration, improves sound insulation performance, The contact contamination is improved and in particular, when the vibration damping sheet using the present invention is attached to an automotive part, it is possible to obtain an excellent effect of adhesion performance, and relates to a vibration damping material composition excellent in reducing odor.

Damping Materials, 1,2-Polybutadiene, Isobutylene, Inorganic Filler, Quicklime

Description

The vibration damping material composition

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping material composition. More specifically, a binder containing 1,2-polybutadiene and isobutylene, an inorganic filler, a fiber filler, and quicklime are mixed to cover the bottom surface of an automobile. The present invention relates to a vibration damping sheet that absorbs noise and vibration generated by power sources such as home appliances, and the like, and has improved heat resistance, reduced vibration, improved soundproofing performance, and deformation due to heat. It has been found to improve contact contamination, and in particular, when attaching a vibration damping sheet using the present invention to an automobile part, it is possible to obtain an excellent effect of adhesion, and to a vibration damping material composition having excellent odor reduction.

Vibration and noise in road vehicles have long been a concern as a challenge to reduce. In order to reduce such vibration and noise, researches have been conducted in various fields such as tires, shovars, and body structures, and are being steadily progressed. Vibration control and soundproofing effect in this field is to provide a vibration damping sheet, it is mounted in the form of a seat in the existing vehicle is heat-sealed by the heat of the coating oven in the car to exhibit the vibration and soundproofing performance. The most commonly used type of these products is the asphalt type vibration damping sheet. The asphalt-type vibration damping sheet is composed of various inorganic fillers and organic fillers mixed with asphalt, and has been commercialized through extrusion into sheet form. Asphalt used here is a mixture of straight asphalt and blanc asphalt alone or in a suitable ratio, and some of them use modified asphalt modified with synthetic resin and other polymer materials to impart special functions.

Conventionally, in order to improve the damping performance and light weight, the bottom sheet may be made thick to improve the damping performance, but the weight becomes heavy, and when the sheet is made thin, the weight becomes light but the damping performance is inevitably deteriorated. This method was a factor in reversing the trend of high-end and light-weight vehicles, which significantly lowered the efficiency of self-fueled fuel or impaired vibration damping performance.

On the other hand, the blown asphalt used in the conventional sheet is manufactured by blowing air into the straight asphalt heated to about 260 ° C. and subjecting it to oxidation, polymerization, and condensation.It is harder than the straight asphalt, has a higher softening point, and has higher elasticity and impact resistance. While there is little change in the hardness due to temperature, there is a problem in that the manufacturing cost is complicated and the product cost is high.

Thus, the present inventors have tried to solve the performance improvement problems such as high weight, vibration, noise prevention of the conventional vibration damper using asphalt.

The result is a mixture of 1,2-polybutadiene and isobutylene, an inorganic filler, a fiber filler, and quicklime to improve the low heat resistance of the existing asphalt damping sheet, reduce vibration, and soundproof performance. This improved, improved deformation and contact contamination by heat, and found that the adhesion performance is particularly excellent when the vibration damping sheet using the present invention is attached to the automotive parts.

Therefore, an object of the present invention is to provide a vibration damping material composition which has improved vibration damping performance and improved specific gravity, deformation due to heat, and contact contamination.

100 parts by weight of a binder containing 1,2-polybutadiene and isobutylene in a weight ratio of 1: 0.1 to 1: 0.3;

Inorganic filler 100 to 300 parts by weight;

5 to 20 parts by weight of the fiber filler; And

It is characteristic in the damping material composition characterized by containing 3-10 weight part of quicklime.

The present invention will be described in more detail as follows.

The present invention relates to a vibration damping material composition containing a binder of 1,2-polybutadiene and isobutylene, an inorganic filler, a fiber filler, and quicklime in a specific component ratio.

In addition, it demonstrates more concretely about each structural component of the resin composition used by this invention as follows.

The binder used in the present invention is an essential component in the present invention and is used by mixing 1,2-polybutadiene and isobutylene in a weight ratio of 1: 0.1 to 1: 0.3 and using 100 parts by weight.

The 1,2-polybutadiene has a crystallinity of 90 to 99.99%, a melting point of 70 to 110 ° C, a hardness of 30 to 50, and the isobutylene has a molecular weight of 2000 to 2500 g / mol, a viscosity of 4000 to 5000 cts, and a pour point of 10 to 20 degreeC is used.

When the degree of crystallization of the 1,2-polybutadiene is less than 90%, it is difficult to maintain the shape of the product because it does not impart rigidity to the final product, it is difficult to maintain the shape of the product when the melting point is less than 70 ℃, and the workability is remarkably higher than 110 ℃. There is a problem that excessive energy costs are lowered to commercialize. When the hardness is less than 30, the vibration damping property is lowered, and when the hardness is greater than 50, problems of workability degradation and product cracking occur.

When the molecular weight of the isobutylene is less than 2000 g / mole there is a problem that the vibration damping performance is lowered, when it exceeds 2500 g / mole there is a problem that the high temperature workability is lowered, when the viscosity is less than 4000 cts, the vibration damping performance is reduced, 5000 When the cts is exceeded, there is a problem that the high temperature workability is lowered. When the pour point is lower than 10 ° C., the elasticity is lowered.

The binder is mixed with the highest elastic modulus and 1.2-polybutadiene having a melting point of 70 to 100 ° C. is first melted at 120 ° C. for 20 minutes. At this time, the stirring speed is suitable 50 ~ 200 rpm. About 10 to 30 parts by weight of a low molecular weight liquid polybutene mainly composed of isobutylene is added to 100 parts by weight of the liquid material to obtain a uniform mixture with additional stirring for about 30 minutes at 200 to 300 rpm. The finished binder has specific gravity of 0.85 to 0.95, elongation of 15 to 45%, penetration of 20 or less, and it is more effective to use a softening point of 50 to 70 ° C.

The inorganic filler used in the present invention has strength reinforcement and vibration damping performance improvement characteristics, and uses one or a mixture of two or more selected from talc, clay, calcium carbonate, mica and mica, and 100 parts by weight of the binder. It is used in the range of 100 to 300 parts by weight, and when it is less than 100 parts by weight, the sheet productivity is remarkably lowered, and the rigidity of the sheet cannot be secured. Problems that interfere with sex occur.

The fiber filler used in the present invention is effective in controlling the thermal fluidity of the sheet product, and in particular, one or two or more kinds of mixtures selected from paper, cotton, hemp, acrylic, nylon, polyester, and the like may be used. It is more preferable to use polyester which has the property which is favorable for fluidity | liquidity and fluidity. Such a fiber filler is used in the range of 5 to 20 parts by weight based on 100 parts by weight of the binder, and when used in less than 5 parts by weight, there is a problem in that it is not possible to maintain the product shape because of low flow control and rigidity reinforcing effect of the sheet. If the weight part exceeds, there is a disadvantage in that the welding performance according to the body panel shape is hindered.

The quicklime absorbs moisture of the kneaded material and the kneaded material to prevent swelling of the sheet generated during thermal fusion and enables long-term use, and the amount of use is in the range of 3 to 10 parts by weight based on 100 parts by weight of the binder, When less than 3 parts by weight of water absorption performance is insufficient to prevent long-term storage and swelling shape of the sheet, when more than 10 parts by weight of the excessive cost than the problem of the factor of cost increase occurs.

The resin composition thus constructed is put in a stirrer, mixed at a temperature of 140 to 160 ° C. for 3 to 4 minutes, extruded by an extruder to produce a sheet.

Hereinafter, the present invention will be described in more detail based on the following examples, but the present invention is not limited to the examples.

Example 1

A binder was prepared by mixing 1,2-polybutadiene and isobutylene in a 1: 0.1 weight ratio, and the binder and each of the components at 150 ° C. in a stirrer at a ratio as shown in Table 1 below, 3 to 4 After mixing for a minute, extruding with an extruder to produce a specimen, and measuring the sheet thickness, specific gravity, crack resistance, surface adhesion deformation, body panel adhesion, odor, and vibration damping performance for the specimen produced for physical properties evaluation 2 is shown.

Example 2

A binder was prepared by mixing 1,2-polybutadiene and isobutylene in a 1: 0.2 weight ratio, and the binder and each of the components at 150 ° C. in a stirrer at a ratio as shown in Table 1 below, 3 to 4 After mixing for a minute, extruding with an extruder to produce a specimen, the sheet thickness, specific gravity, crack resistance, surface adhesion deformation, body panel adhesion, odor, and vibration damping performance of the specimen prepared for physical properties evaluation Table 2 shows.

Comparative example  One

Table 2 was prepared by measuring the composition of the asphalt binder and the specimen prepared for evaluation of physical properties. The thickness, specific gravity, crack resistance, surface adhesion deformation, body panel adhesion, odor, and vibration damping performance were measured and shown in Table 2.

Division (weight part) Example 1 Example 2 Comparative Example 1 Binder 1,2-polybutadiene 100 100 - Polybutene 10.0 20.0 - asphalt - - 100.0 Calcium carbonate 200.0 250.0 300.0 Polyester fiber 20.0 10.0 20.0 quicklime 5.0 7.0 10.0 sum 335.0 387.0 430.0

<Test method>

(1) Specific gravity was evaluated according to the specimen thickness of 3 mm, ASTM D792.

(2) Crack resistance and surface adhesion strain The test specimen (100 × 100 × 3 mm) was placed on the specimen thickness of 3 mm and the iron plate (150 × 150 × 0.8 mm), and 10 ~ 20 micrometer thick paint was applied to the specimen surface. Then, dry heat treatment is performed at 150 ° C. for 30 minutes. Next, put two pieces of gauze on the test piece, place the weight (500 g × 40 pie) on it, and after standing for 140 × 2 hours, remove the weight after cooling to room temperature, remove the gauze, and adhere to the crack state of the test piece and the contamination of the gauze. Deformation was evaluated

(3) Body panel adhesion is placed on a specimen thickness of 3 mm and a glass plate (150 × 150 × 2 mm) on a test specimen (100 × 100 × 3 mm) and subjected to dry heat treatment for 150 ° C for 30 minutes. After cooling to room temperature, the attachment area of the bore on the back side of the specimen was evaluated based on the attachment surface based on the size of the specimen in%.

(4) The odor was placed in a 3 liter desiccant, 50 × 50 mm specimens were closed, and left in a 110 ° C. oven for 2 hours, followed by cooling for 1 hour at room temperature, followed by odor evaluation.

(5) The vibration damping performance was evaluated according to the overst method, and the loss factor measured at the second resonance point was shown.

division Example 1 Example 2 Comparative Example 1 Sheet thickness (mm) 3.0 3.0 3.0 importance 1.550 1.600 1.650 Crack resistance Crack Crack crack Surface Adhesive Deformation no problem no problem Discoloration / deformation Body panel adhesion 85% 80% 50% smell Level 4 or higher Level 4 or higher Level 3 Dustproofing Performance 20 ℃ 0.18 0.17 0.17 40 ℃ 0.20 1.20 0.09

As can be seen from Table 2, the vibration damping material composition of Comparative Example 1 is discolored and deformed, shows cracks in the crack resistance test, the body panel adhesion is significantly reduced, the smell is also irritating, and the vibration damping performance was shown, When the test piece was manufactured using the binder of the present invention and the results of the test evaluation were compared with the existing products, it was found that the vibration suppression performance was excellent, the smell was significantly reduced, the body panel adhesion was excellent, and no crack was generated. .

As described above, according to the present invention, by using a polymeric binder using 1,2-polybutadiene and isobutylene, it has excellent vibration damping performance, and thus, sheet shape deformation due to heat, which has been a problem of conventional asphalt type vibration damping sheets, has been achieved. Completely eliminates performance degradation, does not contaminate other parts in the manufacturing process or finished products, and eliminates the use of asphalt in odors, thereby removing the unique odors of asphalt to achieve the effect of improving the indoor odor of automobiles. It can be used to prepare.

Claims (5)

100 parts by weight of a binder containing 1,2-polybutadiene and isobutylene in a weight ratio of 1: 0.1 to 1: 0.3; Inorganic filler 100 to 300 parts by weight; Fiber filler 5 to 20 parts by weight, and 3 to 10 parts by weight of quicklime. The damping material composition according to claim 1, wherein the 1,2-polybutadiene has a crystallinity of 90% or more, a melting point of 70 to 110 ° C, and a hardness of 30 to 50. The damping material composition according to claim 1, wherein the isobutylene has a molecular weight of 2000 to 2500 g / mol, a viscosity of 4000 to 5000 cts, and a pour point of 10 to 20 ° C. The vibration damping material composition of claim 1, wherein the inorganic filler is one or a mixture of two or more selected from talc, clay, calcium carbonate, mica, and mica. The vibration damping material composition according to claim 1, wherein the fiber filler is one or a mixture of two or more selected from paper, cotton, hemp, acrylic, nylon, and polyester.