KR100718164B1 - Viscoelastic rubber compound for high damping - Google Patents

Abstract

The present invention relates to a high-damping viscoelastic rubber composition, and more particularly to a high-damping viscoelastic rubber composition applicable to a bridge and construction, so as to include a non-reactive resin and a reactive resin. The present invention relates to a high damping viscoelastic rubber composition that can be applied to a viscoelastic material, which is a material that decreases the response by increasing the damping capacity of the structure.

In the present invention, the ratio of shear stress coefficient [G (-20 ° C) / G (20 ° C)] is 1.9 to 2.2, the elongation is 500% or more, and the tangent delta (0 to 20 ° C) is 0.35 to 0.90 (damping value. 18% to 45%) and a high damping viscoelastic rubber composition having a hardness of 60 or more.

The high damping viscoelastic rubber composition of the present invention can be applied to bridges and buildings to increase the damping capacity of the structure to act as a dust-proof rubber.

Description

Viscoelastic Rubber Compound for High Damping

The present invention relates to a high-damping viscoelastic rubber composition, and more particularly to a high-damping viscoelastic rubber composition applicable to a bridge and construction, so as to include a non-reactive resin and a reactive resin. The present invention relates to a high damping viscoelastic rubber composition that can be applied to a viscoelastic material, which is a material that decreases the response by increasing the damping capacity of the structure.

Today, with the development of structural engineering and the use of high-strength materials in construction and civil engineering, structures are becoming larger and lighter in weight, and in particular, in the field of construction, ultra high-rise buildings or bridges with very low structural stiffness and damping ratio are increasing day by day.

In accordance with this trend, vibration control technology has been developed to secure vibration control technology in extreme situations such as earthquake loads of structures, wind loads, and vibration acceleration control of buildings against internal and external vibration sources. .

Most domestic buildings, however, are looking for ways to compensate for earthquakes in the early design stages of the building, and to supplement the stiffness of the building with structural analysis.

In this respect, seismic devices that can absorb dust, dust, and shock are continuously being developed. As a seismic device developed at present, it is an anti-vibration spring using a metal material, and the vibration isolation effect is large in the dust-proof region, but it has a limitation in application because excessive vibration response occurs. In the case of the earthquake resistant device using the anti-vibration rubber, the vibration isolation effect is reduced in the dust-proof region due to the larger loss factor of the material itself than the metal, but excessive vibration response is suppressed.

In general, rubber vulcanizates used as dustproof materials are viscoelastic materials that exhibit both viscoelastic and elastic properties. When the viscoelastic material is deformed, some energy is accumulated but the remaining energy is released as heat.

This phenomenon is due to the hysteresis (mechanical energy is converted to heat, the mechanical energy converted into heat is proportional to the viscosity.

For this reason, the excitation of a structure without a viscoelastic rubber damper continues to be compared with the case where a viscoelastic rubber damper is not installed in the structure, but the excitation of a structure with a viscoelastic rubber damper is a damper. The high damping performance of causes the aftershocks to stop at high speeds.

At present, most of the damper rubber materials used in Korea are mixed with natural rubber (NR) and butadiene rubber (BR) which are diene rubbers. On the other hand, carbon black, which is a reinforcing agent, is used in an amount of 20 to 50 parts by weight based on 100 parts by weight of the raw material rubber, and resin is used within 20 parts by weight as an additive for the rubber material. In addition to these, other additives added to the rubber for dampers, anti-aging agents, vulcanizing agents and their supporting agents and process aids are also used. The main material is recycled rubber. For this reason, in the case of the conventional damper material, the quality uniformity of the required performance falls, and the damping characteristic is limited to the required use as a damping agent within 10%.

The present invention devised to solve the above-mentioned problem is to develop a viscoelastic material, which is a material that reduces the response by increasing the damping capacity of a structure, and uses a general rubber as a high viscosity damping material. An object of the present invention is to provide a highly damped viscoelastic rubber composition.

The present invention also provides a ratio of shear stress coefficient [G (-20 ° C) / G (20 ° C)] of 1.9 to 2.2, an elongation of 500% or more, and a tangent delta (0 to 20 ° C) of 0.35 to 0.90 (damping value). 18% to 45%) and a high attenuation viscoelastic rubber composition having a hardness of 60 or more.

The high damping viscoelastic rubber composition of the present invention can be applied to bridges and buildings to increase the damping capacity of the structure to act as a dust-proof rubber.

The present invention for achieving the above-mentioned object has a high damping performance in the viscoelastic rubber composition to include 15 to 50 parts by weight of any one or more selected from non-reactive resin, reactive resin with respect to 100 parts by weight of the raw material rubber Represents a viscoelastic rubber composition that can be applied to the vibration prevention of the structure.

In the present invention, the raw material rubber can be used as long as it can be used as the raw material rubber of the viscoelastic rubber composition applicable to the vibration prevention of the conventional structure.

In the present invention, as the raw material rubber, any one or more selected from natural rubber and synthetic rubber may be used as the raw material rubber.

As an example of the raw material rubber in the present invention it can be used mixed rubber mixed with natural rubber and synthetic rubber in the ratio of 1: 9 to 9: 1. In addition, mixed rubbers in which two kinds of synthetic rubbers are mixed in a ratio of 1: 9 to 9: 1 can be used. And it is possible to use a mixed rubber of two or more kinds of synthetic rubber mixed with each other.

The synthetic rubber may be any one or more selected from styrene butadiene rubber, butadiene rubber, styrene butadiene rubber containing isoprene, styrene butadiene rubber including nitrile, neoprene rubber, butyl rubber, bromo butyl rubber, and chloro butyl rubber. have.

As an example of a preferred raw rubber in the high damping viscoelastic rubber composition of the present invention, 50 to 90 of any one or more selected from 10 to 50 parts by weight of natural rubber, butyl rubber, bromo butyl rubber and chloro butyl rubber in 100 parts by weight of raw rubber. It may include parts by weight.

In the viscoelastic rubber composition of the present invention, 15 to 50 parts by weight of any one or more selected from non-reactive resins and reactive resins may be used with respect to 100 parts by weight of the raw material rubber in order to improve the viscosity property and minimize the temperature change of the damping property according to the temperature change. have.

As a preferred example of the present invention, the viscoelastic rubber composition contains 10 to 40 parts by weight of the non-reactive resin and 5 to 10 parts by weight of the reactive resin with respect to 100 parts by weight of the raw material rubber so that the ratio of the reactive resin to the non-reactive resin (non-reactive resin / It is preferable to use a non-reactive resin and a reactive resin in the viscoelastic rubber composition so that the reactive resin) becomes 1-4.

The non-reactive resin may be any one or more selected from rosin-based resins, alkylphenol resins, C4 fractions, C5 fractions, and C9 fractions.

As non-reactive resins, rosin-based resins are commercially available commodities such as Pentalyn A, Rikafine tech Inc., JAPAN, Pentalyn K, Hercules Incorporated, USA, or Diphen 8318 (dyphene 8318). , PMC Specialties Group, Inc.).

As the non-reactive resin, the alkylphenol resin may be an alkylphenol resin having an alkyl group having 1 to 10 carbon atoms.

In the above-described reactive resin, a ketsho nut-cell liquid (CNSL) including formaldehyde group, and ketsho-nut cell liquid (CNSL) including a phenol group may be used.

As an example of the above-mentioned reactive resin, the ketsho nut cell liquid containing the formaldehyde group may have a formaldehyde content of 1 to 3% and a ketsho nut cell liquid (CNSL) content of 97 to 99%. In addition, the ketsho nut cell liquid (CNSL) containing a phenol group has a phenol group content of 1 to 3%, and a ketsho nut cell liquid (CNSL) content of 97 to 99%.

The high damping viscoelastic rubber composition of the present invention may include carbon black as a reinforcing agent.

The high damping viscoelastic rubber composition of the present invention may include 40 to 80 parts by weight based on 100 parts by weight of the raw material rubber.

In the carbon black, an iodine adsorption value of 80 to 140 mg / g and a DBP adsorption value of 60 to 150 ml / 100 g may be used.

In the high damping viscoelastic rubber composition of the present invention, carbon black having various properties and contents is applied to the rubber composition. In order to achieve the object of the present invention, it is preferable to apply carbon black having the above properties and contents.

According to the present invention, various additives such as activators, anti-aging agents, process oils, vulcanizing agents, and vulcanization accelerators, which are used in conventional viscoelastic rubber compositions, in addition to the above-mentioned raw rubber, carbon black, non-reactive resin, and reactive resin are selected as necessary. It can be used in a predetermined content. However, these are general components used in the viscoelastic rubber composition and are not essential components of the present invention.

On the other hand, the present invention includes a high damping viscoelastic rubber that can be applied to the bridge including the rubber made of the rubber composition or a high damping viscoelastic rubber that can be applied to buildings.

The rubber made of the viscoelastic rubber composition of the present invention has a ratio of shear stress coefficient [G (-20 ° C.) / G (20 ° C.)] of 1.9 to 2.2, an elongation of 500% or more, and a tangent delta (0 to 20 ° C.). It may have physical properties of 0.35 to 0.90 (damping value of 18% to 45%) and hardness of 60 or more.

Hereinafter, the present invention will be described by the following comparative examples, examples and test examples. However, these are not limited to the scope of the present invention by these as an embodiment of the present invention.

Comparative Example 1

50 parts by weight of raw material rubber consisting of 50 parts by weight of butadiene rubber (BR) and 50 parts by weight of natural rubber (NR), 50 parts by weight of carbon black, 5 parts by weight of zinc oxide, 6 parts by weight of stearic acid, anti-aging agent (Kumanox-13, Kumho) Petrochemical) 4 parts by weight, vulcanizing agent (sulfur) 2 parts by weight, 1.8 parts by weight of vulcanization accelerator (Nt-butylbenzothiazole sulfenamide, NS) was added and vulcanized at 160 ℃ for 25 minutes to prepare a rubber specimen.

Carbon black was used as the iodine adsorption value of 70mg / g, DBP adsorption value of 50ml / 100g.

The composition of Comparative Example 1 is shown again in Table 1 below.

Comparative Example 2

In the same manner as in Comparative Example 1, except that 80 parts by weight of styrene butadiene rubber (SBR) and 20 parts by weight of butadiene rubber (BR) were used as raw material rubber, and 75 parts by weight of carbon black was used based on 100 parts by weight of raw material rubber. Rubber specimens were prepared.

<Example 1>

75 parts by weight of carbon black, 20 parts by weight of non-reactive resin, 5 parts by weight of zinc oxide, 6 parts by weight of stearic acid, and anti-aging agent (Kumanox) based on 100 parts by weight of raw material rubber consisting of 90 parts by weight of butyl rubber and 10 parts by weight of natural rubber (NR). -13) 4 parts by weight of vulcanizing agent (sulfur) and 1.8 parts by weight of vulcanization accelerator (NS) were added and vulcanized at 160 ° C. for 25 minutes to prepare a rubber specimen.

In the above carbon iodine adsorption value of 100mg / g, DBP adsorption value of 110ml / 100g was used, the non-reactive resin was used diphene 8318 (dyphene 8318, PMC Specialties Group, Inc.).

The composition of Example 1 is shown again in Table 1 below.

<Example 2>

A rubber specimen was prepared in the same manner as in Example 1, except that 10 parts by weight of the non-reactive resin and 10 parts by weight of the reactive resin were used based on 100 parts by weight of the raw material rubber.

In the above non-reactive resin, diphene 8318 (dyphene 8318, PMC Specialties Group, Inc.) was used, and the reactive resin was ketsho nut cell liquid (CNSL) containing a phenol group (phenolic group content of 2%, Show nut cell liquid (CNSL) content was 98%).

<Example 3>

70 parts by weight of butyl rubber and 30 parts by weight of natural rubber (NR) are used as raw material rubber, except that 57 parts by weight of carbon black, 15 parts by weight of non-reactive resin, and 10 parts by weight of reactive resin are used based on 100 parts by weight of this material rubber. To prepare a rubber specimen in the same manner as in Example 1.

In the above non-reactive resin, diphene 8318 (dyphene 8318, PMC Specialties Group, Inc.) was used, and the reactive resin was ketsho nut cell liquid (CNSL) containing a phenol group (phenolic group content of 2%, Ketsho Nut cell liquid (CNSL) content of 98%) was used.

<Example 4>

Except that 70 parts by weight of butyl rubber, 30 parts by weight of natural rubber (NR) is used as raw material rubber, and 57 parts by weight of carbon black and 10 parts by weight of reactive resin are used with respect to 100 parts by weight of the raw material rubber. Rubber specimens were prepared in the same manner.

In the above, the reactive resin was used as a ketsho nut cell liquid (CNSL) containing a phenol group (phenolic group content of 2%, Ketshaw nut cell liquid (CNSL) content of 98%).

Example 5

50 parts by weight of butyl rubber and 50 parts by weight of natural rubber (NR) are used as raw material rubber, except that 57 parts by weight of carbon black, 25 parts by weight of non-reactive resin, and 10 parts by weight of reactive resin are used based on 100 parts by weight of this material rubber. To prepare a rubber specimen in the same manner as in Example 1.

In the above non-reactive resin, diphene 8318 (dyphene 8318, PMC Specialties Group, Inc.) was used, and the reactive resin was ketsho nut cell liquid (CNSL) containing a phenol group (phenol group content of 2%, Nut cell liquid (CNSL) content of 98%) was used.

Table 1 Compositions of Comparative Examples and Examples

              Item Comparative Example 1 Comparative Example 2 Example 1 Example 2 Example 3 Example 4 Example 5 SBR - 80 - - - - - BR 50 20 - - - - - Butyl rubber - - 90 90 70 70 50 NR 50 - 10 10 30 30 50 Carbon black 50 75 75 75 57 57 57 Zinc oxide 5 5 5 5 5 5 5 Stearic acid 6 6 6 6 6 6 6 Anti-aging 4 4 4 4 4 4 4 Non-reactive resin - - 20 10 15 - 25 Reactive resin - - - 10 10 10 10 Vulcanizing agent 2 2 2 2 2 2 2 Vulcanization accelerator 1.8 1.8 1.8 1.8 1.8 1.8 1.8

<Test Example>

The rubber specimens of Comparative Examples and Examples were measured for physical properties of Tables 2-1 and 2-2 according to ASTM-related regulations, and the results are shown in Tables 2-1 and 2-2 below.

<Table 2-1> Physical Properties of Comparative Examples and Examples Specimen

Item Comparative Example 1 Comparative Example 2 Example 1 Rheo (160 ℃) TOQ (max) 35.2 35.2 22.8 TOQ (min) 13 13 12.5 T40 11.2 11.2 17.73 T90 18.28 18.28 36.68 EC 20.11 20.11 40.35 Tensile Properties Hardness 62 62 70 100% modulus 17.2 17.2 19 300% modulus 87.4 87.4 57.8 The tensile strength 194 173 134 Elongation 590 594 621 GABO Glass transition temperature (Tg) -31 -31 -22.6 tangent delta (0 ℃) 0.287 0.287 0.424 tangent delta (20 ℃) 0.197 0.201 0.372 Damping ratio (%) 9.9 10.1 18.6 G (-20 degrees Celsius) 1.5 1.61 1.3 G (20 degrees Celsius) 0.7 0.8 0.6 G (-20 degrees C) / G (20 degrees C) 2.14 2.01 2.03

<Table 2-2> Physical Properties of Example Specimen

Item Example 2 Example 3 Example 4 Example 5 Rheo (160 ℃) TOQ (max) 22.8 22.1 22.3 21.4 TOQ (min) 12.5 12.5 12.5 11.9 T40 17.73 17.73 19.07 10.02 T90 36.68 36.68 38.14 37.21 EC (end cure) 40.35 40.35 41.95 40.93 Tensile Properties Hardness 70 70 70 62 100% modulus 22.1 19 22.1 16.2 300% modulus 65.8 57.8 65.8 55.1 The tensile strength 132 124 127 120 Elongation 638 651 643 650 GABO Glass transition temperature (Tg) (℃) -23 -22.6 -23 -21 tangent delta (0 ℃) 0.474 0.484 0.472 0.481 tangent delta (20 ℃) 0.432 0.462 0.397 0.461 (damping ratio) (%) 21.6 23.1 19.9 23.5 G (-20 ° C) * 1.12 1.15 1.15 1.12 G (20 degrees Celsius) 0.57 0.57 0.59 0.57 G (-20 ℃) / G (20 ℃) ** 1.96 2.02 1.59 1.96

* G is the shear stress.

** is the ratio of the shear stress coefficient

As a result of the test example, it can be seen that the rubber specimen of the embodiment of the present invention is superior in the ratio of tensile properties such as hardness and elongation, damping ratio, shear stress coefficient, and shear stress coefficient to the rubber specimen of the comparative example.

The high damping viscoelastic rubber composition of the present invention can be applied to bridges and buildings to increase the damping capacity of the structure to act as a dust-proof rubber.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated that it can be changed.

Claims (6)

In the viscoelastic rubber composition, A high-damping viscoelastic rubber composition comprising 15 to 50 parts by weight of any one or more non-reactive resins selected from rosin-based resins, C4 oils, C5 oils and C9 oils based on 100 parts by weight of the raw material rubber. delete According to claim 1, The raw material rubber is 10 to 50 parts by weight of natural rubber; High-damping viscoelastic rubber composition, characterized in that it contains 50 to 90 parts by weight of any one or more selected from butyl rubber, bromo butyl rubber, chloro butyl rubber. delete delete The rubber composition of the rubber composition has a ratio of shear stress coefficient (G (-20 ° C.) / G (20 ° C.)) of 1.9 to 2.2, an elongation of 500% or more, and a tangent delta (0 to 4). 20 degreeC) High damping viscoelastic rubber composition whose value is 0.35-0.90 (damping value 18%-45%), and hardness is 60 or more.