KR100378256B1 - White Rice Husk Ash filled Tread rubber composition for Truck and Bus tire - Google Patents

Abstract

The present invention relates to a tread rubber composition for truck and bus tires using assorted chaff ash as a reinforcing filler. More particularly, the present invention provides low fuel efficiency, tearing and penetrating properties by applying the asbestos chaff ash to the rubber composition together with carbon black as a filler. The present invention relates to an improved environmentally friendly tread rubber composition for truck and bus tires.

Description

White Rice Husk Ash filled Tread rubber composition for Truck and Bus tire}

The present invention relates to a tread rubber composition for truck and bus tires using assorted chaff ash as a reinforcing filler. More particularly, the present invention provides low fuel efficiency, tearing and penetrating properties by applying the asbestos chaff ash to the rubber composition together with carbon black as a filler. The present invention relates to an improved environmentally friendly tread rubber composition for truck and bus tires.

The use of carbon black in the tread part of a tire as a reinforcing filler is excellent in abrasion resistance, but has shown limitations in improving low fuel consumption characteristics such as tearing of rubber.

As a solution to this problem, silica is partially substituted for carbon black to improve low fuel efficiency and prevent tearing of the tread rubber. However, this also has limitations in actual application due to the difficulty of the compounding process and rising raw material prices.

The present invention has been made to solve the conventional problems as described above, an object of the present invention is a painting rice husk ash with carbon black as a filler in the rubber composition (hereinafter referred to as "W-RHA") The present invention provides an environmentally friendly tread rubber composition for truck and bus tires with improved fuel economy, tearing and chipping.

The tread rubber composition for truck and bus tires of the present invention comprises 100 parts by weight of raw material rubber, 15 to 60 parts by weight of carbon black and 5 to 20 parts by weight of crushed rice hull ash, carbon black / painted rice hull ash = 10/1 to 3 / It is characterized by using in 1 ratio.

In the rubber composition of the present invention, the raw material rubber is a natural rubber alone or a polymer composition using 60% or more of natural rubber as natural rubber / styrene-butadiene rubber, polyisoprene rubber, POLYISOPRENE RUBBER, Butadiene rubber (BUTADIENE RUBBER) can be used in combination.

As the carbon black used in the rubber composition of the present invention, it is preferable to use N300, N200 series or N100 series carbon black. In order to obtain the desired effect of the present invention, the carbon black is preferably used in an amount of 15 to 60 parts by weight based on 100 parts by weight of the raw material rubber, and is preferably used in a ratio of carbon black / ash chaff ash = 10/1 to 3/1.

The inverted rice husk ash used in the rubber composition of the present invention is heated to a chaff in an oxidizing atmosphere of 400 ° C. or more to burn carbon components to 2% or less free carbon. SiO ₂ : 94-99%, CaO: 0.5-1.5%, MgO: 0.1-0.5%, Fe ₂ O ₃ : 0.1-0.5%, other carbonization components: 5% or less. In order to obtain sufficient reinforcement, it is preferable to use a calcined rice hull ash having a particle size of 10 μm or less by using a ball mill method. In addition, it is preferable to use 5-20 parts by weight of the rice hull ash to improve the low fuel efficiency, tearing and penetration characteristics of the tread rubber for truck and bus tires. When the inverted rice hull ash is less than 5 parts by weight can not be expected to have sufficient effects in low fuel efficiency and tear resistance, and if it exceeds 20 parts by weight, low fuel efficiency, tear resistance, etc. is improved, but wear resistance is not preferable because it sharply drops. As described above, by recycling the chaff generated in a large amount in the rice farming country each year, it is possible to obtain a desirable effect in terms of resource recycling and environmental protection.

Other components may be added to the rubber composition of the present invention as needed, for example, 1 to 3 parts by weight of stearic acid, 3 to 6 parts by weight of zinc (ZnO), 0.5 to 1.8 parts by weight of accelerator, and other plasticizers and softeners. And a preservative may be included.

Hereinafter, the present invention will be described in detail through the following examples. However, the following examples are merely provided to illustrate the present invention, but do not limit the technical scope of the present invention.

Comparative Example and Example

To prepare a rubber composition according to the composition shown in Table 1 in a conventional manner, the physical properties were measured. The physical property measurement results are shown in Table 2.

Table 1 (unit: parts by weight)

Furtherance Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Natural Rubber (SMR-5CV) 100 100 100 100 100 100 Carbon black (N220) 50 40 30 30 40 30 Silica 0 10 20 0 0 0 Painting chaff ash 0 0 0 30 10 20 oil 5 5 5 5 5 5 ZnO 4 4 4 4 4 4 Stearic acid One One One One One One Other Chemicals ^* 4.5 4.5 4.5 4.5 4.5 4.5 Glass sulfur 2.0 2.0 2.0 2.0 2.0 2.0 Accelerator (NS) 0.6 0.6 0.6 0.6 0.6 0.6 DPG 0 0.3 0.3 0.3 0.3 0.3

^* : Preservative, wax and process aid

Table 2. Property Measurement Results

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Viscosity (125 ° C) ¹⁾ 68 68 72 59 64 61 Shore-A 62 62 60 59 62 61 300% modulus ²⁾ (kgf / ㎠) 92 7 78 61 88 77 Tensile Strength (kg / ㎠) 238 230 221 218 231 228 Elongation at Break (%) 601 632 612 658 624 614 Wear (PICO, g) ³⁾ 0.075 0.080 0.095 0.125 0.078 0.087 Heat Build-up (℃) 38 42 43 34 34 32 BFG CutChip 1.576 1.487 1.489 1.748 1.459 1.548 DMFC ⁴⁾ Portrait 5.44.3 5.24.8 4.83.6 2.12.1 4.94.0 4.83.8 Tan delta (60 ℃) ⁵⁾ 0.102 0.098 0.097 0.088 0.094 0.091 Tearing energy ⁶⁾ (kg / ㎠) 98 102 104 87 111 114

¹⁾ Viscosity: Measured using a pattern tester, carried out at 125 ℃.

²⁾ 300% Modulus: Value of stress at 300% elongation.

³⁾ Abrasion Degree: Abrasion resistance was evaluated by using PICO test equipment. It shows the amount lost after 80 rotations.

⁴⁾ DMFC: De-Mattia flexing cracking shows the size of horizontal and vertical crack growth after 6,000 runs after initial cracking at the center of the initial specimen.

⁵⁾ Tandelta at 60 ℃: A value that predicts the low fuel consumption characteristics of tire performance, measured using an elastomer (elastomerics, model 1332) instrument (frequency: 11 Hz, average level: 10 %, Amplitude: 5%).

⁶⁾ Tear Energy: Measured using the Trouser test method.

As can be seen in Table 2, as shown in Comparative Example 1, when the carbon black alone is used without the ingested rice hull ash, the PICO value showing the wear resistance was significantly decreased. In addition, physical properties such as tearing and penetrating properties were better in Examples 1 and 2 in which carbon black and incinerated rice hull ash were used in combination than in Comparative Examples 2 and 3 using silica without using calcined rice hull ash.

In other words, when carbon black and incinerated chaff ash are used in combination (Examples 1 and 2), a 60 ° C tan delta value exhibiting low fuel consumption characteristics and a tearing energy value that can predict tearing and penetration characteristics without deterioration of wear resistance characteristics are remarkable. It shows how it can be improved. In addition, the rice hull bran can be lowered by adjusting the mixing amount with carbon black, and in particular, the process stability was also excellent.

As shown in Examples 1 and 2, the best results were obtained when using 10, 20 parts by weight of 100% by weight of natural rice husk ash, and when using more than 20 parts by weight of rice husk ash (Comparative Example 4). It was confirmed that the wear characteristics were reduced.

Experimental Example

The rubber composition of the comparative example and the example was applied to a truck / bus tire (11R22.5 9736 pattern), and the actual vehicle abrasion test was conducted, and the results are shown in Table 3.

Table 3. Driving Test Results (Contrast)

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Abrasion Resistant City Bus 15 Ton Dump Truck 100100 9598 9087 7572 9795 9190 Single wear rate (city bus,%) 32 10 8 10 6 8 Tear and Penetration Characteristics (15 ton dump truck, mm) 45 15 10 12 8 5

Abrasion resistance: Comparison of the remaining skid depth after the actual vehicle. The relative value is set at 100 as the standard 1, and the higher the value, the better the wear performance.

As shown in Table 3, when the carbon black / painted chaff ash is used in a mixed embodiment, the tearing and penetration characteristics are excellent without a great drop in the wear resistance. To this extent, it was possible to use it longer than two months compared with the comparative example, which is considered to be because of the relatively excellent tearing and penetration characteristics.

As can be seen from the above, the truck / bus tire made of the rubber composition according to the present invention has excellent low fuel efficiency and has an effect of improving tearing and penetration characteristics. It also has the effect of protecting the environment by recycling chaff.

Claims (3)

Truck bus comprising 100 parts by weight of raw material rubber, 15 to 60 parts by weight of carbon black, and 5 to 20 parts by weight of crushed rice hull ash, which is blended at a ratio of carbon black / painted rice husk ash = 10/1 to 3/1. Tread rubber composition for tires. The tread rubber composition according to claim 1, wherein the raw material rubber is a combination of styrene-butadiene rubber, polyisoprene rubber or butadiene rubber in natural rubber alone or in natural rubber at 60% or more. The method according to claim 1 or 2, wherein the calcined rice hull ash is ignited in an oxidizing atmosphere of 400 ℃ or more burned carbon component to 2% or less free carbon, the component is SiO ₂ : 94-99%, CaO: 0.5 A tread rubber composition for truck and bus tires having a particle size of 10 µm or less, with a particle size of 10 µm or less, and 1.5%, MgO: 0.1 to 0.5, Fe ₂ O ₃ : 0.1 to 0.5%, and a carbonization component of 5% or less.