JPS591572A - High-structure carbon black - Google Patents

Abstract

PURPOSE:To provide the titled carbon black which can improve the breaking strength of carbon black-loaded elastomer compsn. and has a specified specific nitrogen adsorption surface area and specified dibutyl phthalate adsorption. CONSTITUTION:A raw hydrocarbon oil from the top of four-cylinder production furnace is ejected in the axial direction within the furnace, and fuel and air from the tangential direction of the side wall of the furnace head are introduced into the furnace to cause a swirling stream. Air from the tangential direction of a side wall adjacent to the position at which the above swirling stream is generated, is introduced thereinto so as to cause a reverse swirling stream, whereby a disturbed atmosphere is formed. The raw oil is thermally cracked in this atmosphere to obtain high-structure carbon black having a specific nitrogen adsorption surface area (N2SA) of 40-60m<2>/g, a dibutyl phthalate (DBP) adsorption (A0) of 165-210ml/100g and a ratio of A1/A0 of 0.65-0.80 wherein A1 is 24MIDBP adsorption (ml/100g).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to high structure carmen silicon.

One of the important characteristics of carbon silk is struttle, which includes permanent struttle (also called acrylate) formed by the fusion of particles during the production of carbon black, and acrylate that is formed by van der It is well known that there are two types of temporary structures (also called acrylates) that are bonded together and formed by the physical forces of medium-wavelength London molecules. The present invention provides carbon black with a relatively large particle size,
This invention relates to a carbon silk characterized by having a significantly higher proportion of temporary structures in carbon black stractures than conventional carbon black.

As a method to evaluate strufture, caryl? hmm! A DBP absorber 1i' (hereinafter referred to as Ao) is usually used to fill the gap in the rack with liquid. This is a calculation of the absorbed amount of DBP/ml for the carbon blank i oor, and the value of Ao is the sum of the permanent structure and the temporary structure.

Mainly permanent 2) carbon deluxe structure
As a method to evaluate the roughness, carmen silk placed in the piston was measured at 1687 kg/all (2400 kg/all).
There is a method of measuring the amount of DBP absorbed after compression (0 psi) four times (referred to as 24M4DBP absorption).

The present invention has a nitrogen adsorption specific surface area (hereinafter referred to as N, 8A) of 40 to 60 rr? /f, DBP absorption amount (Ao
) is 165~2xo-/1oot carbon blank, 16s y Ky/cd (24000pai
) DBP absorption amount (A, ) after compression once and the above A
, and AIZAo is in the range of 0.65 to 0.80, and more preferably a carbon blank having an Ao # of 1180 to 2105 g/100F is desirable for the present invention.

In the process of mixing elastomer and carbon blank,
If the proportion of temporary structures in the carmen black strafts is large, the rate of dispersion of carbon black into the elastomer can be increased, and even with relatively small shear forces, permanent struts can be formed easily.
(aggregate), and good dispersion can be achieved in a short time. A specified in the present invention, 7A,
is an index that represents the proportion of temporary structure in the above-mentioned structure, and the smaller this value is, the larger the proportion of temporary structure is.

Further desirable requirements specified in the present invention include:
Calculated 24M4DBP value, A and actual measured 24M4DBP value,
A large difference between A and -A (hereinafter referred to as △A) indicates that the bonding strength of the permanent struc- tures in the carbon blank struf- tures is low, and When a relatively large external deformation is applied, it results in permanent stracture failure17, and as a result, by relaxing, averaging, and preventing local stress concentrations, the strength of the elastomer composition with ZenBlack is reduced. This contributes to improving the strength of destruction.

The range of N and 8A of the carbon blank of the present invention is 40 to 6
0 m' / f I/Ch 11 h classification) FE
Equivalent to F class. Among these PFtF class car blacks, FE has a high structure.
There is F-H8, MAF (FEF grade high structure silicone, for example, manufactured by Asahi Car Ink, trade name: 60H) black. A in this MAF grade commercially available black, /
In most cases, the value of A, exceeds 0.9. However, A.

/Ao value exceeds 0.9, that is, the proportion of temporary structures in the total structure of carmen silk is low.For ordinary commercially available carbon blanks, when used in industrial rubber parts, the extrusion rate is low. , die swell properties (hereinafter referred to as D, 8.), and dispersibility, which were unsatisfactory in processing properties.

The present inventors believe that if the A1/AOO value in the strutures of the carbon blank is between 0.65 and 0.080, that is, the proportion of temporary structures that are susceptible to collapse within a certain range in the total struttles, The present invention has been completed by discovering that this processing characteristic can be improved. Furthermore, 24MJDBP calculated by the following formula
Value (A,), A, = -0,59+0.22 e (N, 8A) 10, 918 (AO) -2,045x10-"X(A0
1 mushroom and the actually measured 2 4 M 4 D B P value (A
, ), A, -A, (hereinafter referred to as ΔA) is 10
In the case of a carbon blank that satisfies the range of ~30,
This is even more preferable as the silicone of the present invention.

The carbon blank characteristics of the present invention include N and SA of 40 to 6.
On? /f, DBP absorption area (Ao) is 165-21
0d/100F, 24M11) BP absorption value (Al
l and a. It is characterized in that the ratio, A, /A, is in the range of 0.65 to 0.806.
becomes smaller than 0m”/l (particle size greatly improves)
This causes a decrease in the breaking strength (tensile strength) of the elastomer containing car 2 car blank, and aOm'/j
If the particle size is larger than '(particle size becomes smaller), extrusion characteristics, dispersibility in elastomer, D, 8. This is not preferable because the processability is lowered. Furthermore, DBP absorption 'm'
If (Ao) is smaller than 1 (15ns"/1001'), the machining characteristics will deteriorate and it is unsuitable.A.
is 210m! If acetylene gas is added in addition to the carbon black raw material oil during the manufacturing process, a carbon black with a struture of more than /100 will be produced. Although it would be possible to manufacture a rack, it is extremely difficult to manufacture a car rack with a structure exceeding 2xoi/1oot using only the oil furnace method at the current technological level.For example, the particle size of carbon black (
A in the present invention is difficult to control (specific surface area) and to control the removal of fine coke mixed in, and also makes it impossible to operate for a long time due to coke accumulation in the manufacturing equipment.

The upper limit of Jd is limited to 21 oml/1oot.

Furthermore, if the value of A,/Ao is larger than 0.8, that is, the proportion of the temporary structure in the total structure decreases, the dispersion speed of the carbon black into the elastomer will decrease, and the extrusion properties and )
, 8. The processing characteristics deteriorate.

Calculation 24MJDB as a desirable requirement in the present invention
The difference between the P value, A, and the actually measured 24 M l) B P value, A, is the value of 6 people. Carbon blank has a value of -6 to +6, but in addition to the main requirements of carbon black, the present invention provides that if the A value is reduced by 10 or more than the A2 value, a relatively large deformation will be caused to the carbon silk-containing elastomer. The carbon black is even more preferred because the permanent stractures are easily destroyed when the elastomer composition is broken, and by preventing local stress concentration, it contributes to improving the fracture strength, especially the tensile strength, of the elastomer composition. However, if the number of reinforcements is increased from 6 to 30, other reinforcing properties, such as wear resistance, will be significantly reduced, which is not preferable.

The properties of the carbon black used in the present invention are measured as follows.

N, 8A: A8TM, measured from nitrogen adsorption according to D-3037, rr? /f represents the specific surface area of the curved black.

DBP absorption (Ao): This represents the DBP absorption of carbon black measured by JI8-6221, and is used to evaluate the stracture of a carbon blank.

Normal i o o r#! A#:) absorption amount, d/100
It is expressed as F.

24M4DBP absorption needle (A,): AS'l'MD
34911, sample carmen black was heated at 1687 K47al (24,000 psi) in Bis9-Ton.
DBP after repeating compression and loosening 4 times at the pressure of )
Measure the amount of absorption.

24M4DBP absorption (All: Measure the DBP absorption after compressing the sample carton once at 16 s qb/ad (24,000 ps).

As mentioned above, the carbon black according to the present invention has a much higher struc- ture than ordinary carbon black, and has a temporary structure that is easily disintegrated by weak physical bonds such as fans and der Waals Londoners. By increasing the size of the structure within a certain range, processing characteristics such as extrusion speed, D, S, and dispersibility can be significantly improved while retaining the advantages of aging when the structure is increased. Furthermore, by using the carbon black of the present invention with increased struture, it is possible to lower the specific gravity of an elastomer with the same hardness, and it is also possible to increase the amount of oil blended, resulting in a reduction in cost by -10. It also has the advantage of being possible.

Therefore, the carbon black according to the present invention is suitable as a filler for reinforcing industrial rubber parts, for example, exhibiting the various effective properties described above.

The present invention will be explained in more detail with reference to Examples below.

Examples Carbon black according to the present invention and carbon black for performance comparison were prepared using patent [1059132] (Japanese Patent Publication No. 54
Publication No. 38068, applicant Asahi Kerr) Zen Co., Ltd. 2 Company)
It was manufactured using the same manufacturing equipment as used in Example.

The properties of the raw material oil used are shown in Table-■, and the operating conditions of the production equipment were set as shown in Table-H.

The manufacturing apparatus (manufacturing method) according to the above patented invention is aimed at manufacturing high-strength carbon black, and is suitable for manufacturing the carbon black according to the present invention. Therefore, it is more preferable to use a raw material oil with a high BMOI value.

The physicochemical properties of the produced carbon black are shown in Table-[1
This is summarized and shown below.

The car and ji black of Example Runs 41 to 5 in Table m are the main requirements A, 7A, ratio and Desired Requirement A
, -A, == satisfies both requirements within the range of 10 to 30, and Example Run A 60 Kasenblack is A1/A.

Satisfies the ratio, but preferably 2 requirements A, -A, = 10 to 3
0, and Carmen of Comparative Example (7) satisfies the main requirements of AI//A0.

In addition, for comparison, Table 10 shows Asahi car ydy■ product name $6011 (A8TM, N-568 equivalent MAF
) and industrial standard car, Zenzorac (IRB+5
1 is also listed.

In order to evaluate the performance of the carbon black shown in Table M, rubber compositions were prepared with the blending ratios shown in Table II and subjected to various tests.

Part I in Table ■ is 3 parts by weight of kerf for 100 parts by weight of rubber.
? This shows the blending conditions for a constant blend of 50 parts by weight and d parts of the carbon black, in which () is the amount of the sample carbon black blended so that the hardness is equivalent to the hardness of the blend of ÷60H carbon black and 50 parts by weight. This figure shows the blending conditions when changing .

The performance of each rubber compound was evaluated using a rubber property test strip.

(7) Vulcanization of the compound; 145°C 30 minutes ■Extrusion test #: A
Defined according to 8TM D2230-77-A method,
D. 8. (The wound was calculated using equation 1.

1), 8. (%) = 8-8o The rubber properties of each carbon black are measured according to the vulcanized rubber physical test method.
L7 is summarized in (1) and Table (2).

Table -■ shows the rubber properties corresponding to IVc in Table -■, and the extrusion properties (D) of the carbon silk of the present invention compared to the MAFN-568 equivalent product.

It is understood that the carbon black of the present invention is extremely excellent in terms of hardness and 300% tensile stress. It is also understood that it is possible to use a low amount of compound.

Table -■ shows the rubber properties corresponding to the item (■) in Table -■.

(a) Extrusion characteristics: Runs 41 to 5 had D,8. and extrusion speed are both superior to MAFN-568 Comparative 14-.

FLunA6Fi, ΔA is desirable This property does not satisfy the condition Regarding, it is slightly inferior.

Since Run A 71d does not satisfy the main requirements, it is even worse than Run A 6 in terms of characteristics.

(b) Specific gravity: Both RunA 1 to 6 and Comparative Example (7) have lower values than the MAFN-568 product, contributing to weight reduction of the rubber compound.

(1) Tensile strength: RunA 1 to 6 and comparative example (7
) are both excellent in this property.

In summary, ILun A 1.2.4 is necessary to improve extrusion characteristics and dispersibility, which contribute most to processing performance, while maintaining the reinforcing effect (tensile strength) above a certain level.
．． It is understood that a value within a range of physicochemical property values of 5 and 5 must be satisfied. That is, 几unA
1 and j164, the tensile strength is very close to MAF and there is a risk that the improvement effect will decrease, so N
, 8A level 4On? /y or more is required. But N, 8A level is 6 on? /y (
When Run A2.45) is reached, the dispersibility approaches MAP and the improvement effect disappears, so 60tT? /y can be considered as the limit.

Looking at Run A2, the extrusion characteristics are close to M A F and the same improvement effect is at low F, so the DBP level is set to 165.
It can be seen that it must be greater than m/1oot.

Although Comparative Example (7) satisfies the above-mentioned physicochemical properties, it does not satisfy the main requirement of the AI//A0 ratio, so the extrusion properties deteriorate in M A i -. ing. Regarding this characteristic, RunA6, which satisfies the main requirements but does not satisfy the desirable requirements, is improved over Comparative Example/I67, but at most MAP. However, Ru
n A 6 has significantly improved tensile strength compared to MAP, and also contributes significantly to lowering the specific gravity (@quantization) of the formulation.

Run A 4, which is close to the lower limit of the Al/A0 ratio, is bright A.

Assuming that the /Ao ratio 065 is f times, it is 300
Since the % tensile stress is considerably reduced, it is no longer possible to maintain the reinforcing properties of the industrial rubber member using MAF'f.

(Margin below) 17- Table -■ (11 stones 1 calf 1? blank oil) 18- Supplementary Procedures (Method) July 2, 1982 Mr. Kazuo Wakasugi, Commissioner of the Patent Office High structure carbon black 3. Person who makes corrections Relationship to the incident: Patent applicant 2 Ushimacho, Niigata City, Niigata Prefecture Asahi Carbon Co., Ltd. Representative Yutaka Abe Inu 4. Agent 5. Subject of correction Full statement 6. Contents of amendment Submit an engraving of the specification (with no changes to the contents).

7. List of attached documents 1 copy 1
- Procedural amendment ' ■ Indication of the case 1982 Patent Application No. 109493 2, Name of the invention High Structure Carbon Black 2, Kamijima-cho, Niigata City, Niigata Prefecture Asahi Carbon Co., Ltd. Representative Daisuke Abe 4, Agent 1--542-2-ζ The entire statement of contents of the amendment is amended in the attached document.

Attached document list amendment specification 1 copy 2- Description 1, Title of invention High Structure Carbon Black 2, Claim 1, Nitrogen adsorption specific surface area (N2SA) is 40 to 60 d/1
1, a carbon black having a dibutyl phthalate (DBP) absorption amount (AO) of 165 to 2 t aWLl/lo o I, with a dibutyl phthalate (DBP absorption 1) of 24 MlDBP absorption 1 (
A high structure carbon black having a ratio of Al/AO between the value of A+'l/1 o o I) and the value of A, which is in the range of 0.65 to 0.80.

2. Calculated 24M40BP absorption amount (A
2 go/100, P); At =-0,59+
0.229x (N, SA) + 0.918X (AO) -
2,045X10-"X(Ao)" and 24M
The high structure carbon black according to claim 1, wherein the difference (A2 Am) from the 4DBP absorption amount (A, m// 1o o 11 ) is in the range of 10 to 30.

3. Detailed Description of the Invention The present invention relates to high structure carbon black.

One of the important characteristics of carbon black is struttle, and this struttle includes permanent struttle (also called aggregate), which is formed by the fusion of particles during carbon black production, and this aggregate is a fan. It is well known that there are two types of structures: temporary structures (also called azoromalates) that are formed by bonding by physical forces such as der Waal-So-Londonka. The present invention is a carbon black having a relatively large particle size, and is characterized in that the proportion of temporary structures with relatively low bonding strength, which are made into carbon black stractures, is significantly higher than that of conventional carbon black. It's about.

As a method for evaluating stracture, there is a method of filling the voids of carbon black with a liquid, and DBP absorption amount (hereinafter referred to as Ao) is usually used. This is a calculation of the absorption of DBP to carbon black 1009 (J), and the AoO value is the sum of the permanent structure and the temporary structure.

As a method of evaluating mainly permanent stractures in car pump rack structures, carbon black placed in a cylinder was 16 a 7 using a piston.
D after compressing 4 times with ky/d (z+ooopsi)
There is a method for measuring BP absorption (referred to as 24M4DBP absorption).

The present invention has a nitrogen adsorption specific surface area (hereinafter referred to as -8A).
is 40 to 60 m'/I, and the nBp absorption amount (Ao) is 1
65 to ziogg/1ooy carbon black at 1687 ky/cd (24000 psi)
DBP absorption amount after 7 times compression (k 1 rnl/10
The carbon black is characterized in that the ratio ζA4/A (1 is in the range of 0.6 to 0.80, and more preferably in the range of 1803 to 210 rnt/100 & Carbon black is preferred for this invention.

Even within the temporary structure, there is a certain range of bond strength, and during the mixing process of the elastomer and carbon black, the proportion of the temporary structure with relatively low bond strength in the temporary structure to the total structure When the carbon black is large, the dispersion rate of carbon black into the elastomer is increased, and the carbon black becomes easily dispersed even by a relatively small shear force, and a good fraction is achieved in a short time.

A, /Ao specified in the present invention is an index that covers the proportion of temporary structures with relatively low bonding strength in the above-mentioned structure, and the smaller this value is, the more the bonding strength is relatively low among the temporary structures. The proportion of small temporary structures in the total structure increases.

More desirable requirements specified in the present invention: 4 items, calculation: 24M4DBPe, yield: 2, actual measurement:
A large difference between the absorption amount of 4M4DBP and the absorption amount A3, A, -A, (hereinafter referred to as 6 people) indicates that the proportion of permanent stractures in the carbon black stractures and the bond strength thereof are small, and the tensile and tearing The relaxation machine #It leads to the collapse of the temporary structure of carbon black in the elastomer and the partial destruction of the permanent stracture in the relevant reinforcement characterization, resulting in the relaxation of local stress concentrations and the average It is thought that this contributes to improving the breaking strength of the elastomer composition containing carbon black.

The range of N of the carbon black of the present invention is 40 to 6.
It is located at 0d/11 and corresponds to FB3F class in terms of classification. As the black having the FlilF class carbon black structure, FEF-Ha, MA
There is F (FEF grade high structure black, for example, manufactured by Asahi Carbon Co., Ltd., trade name: Asahi 1son) black. A4/AO in this MAF grade commercially available black
The value of tl is almost always greater than 0.9. However, when using ordinary commercially available carbon blacks in which the value of A1/A,0 exceeds 0.9, that is, the proportion of temporary structures in the total structure of carbon black is low, when mixed into industrial rubber members. However, the processing properties of extrusion speed, die swell properties (hereinafter referred to as D and S), and dispersibility were unsatisfactory.

The present inventors found that when the value of A, /Ao in the carbon black stractures is 0.65 to 0.80, that is, the proportion of temporary structures that are relatively easy to collapse in the entire stractures is within a certain range. We have now discovered that this processing characteristic can be improved, and have completed the present invention. Furthermore, 24M4D calculated by the following formula
BPg! Yield (h, yql/x o o i ), A
8=-0,59+0.229 X (N, SA)+0.
9 t 8
! /1oo#) and AsAs (hereinafter referred to as 6 people) satisfies the range of 10 to 30, which is even more preferable as the black of the present invention.

The carbon black characteristics of the present invention are as follows: N, 8A is 40 to 6
0go/#, DBP absorption (Ao) is 165~210d/
100.9, 24MI DBPIII! Yield (A,
) and Ao, A, /A0 is in the range of 0.65 to 0.80. When /I becomes smaller (the particle size becomes larger), the breaking strength (tensile strength) of the elastomer containing carbon black decreases. Moreover, if it is larger than 60 d/g (the particle size becomes small), the extrusion characteristics, dispersibility into elastomers, and processability such as D and S deteriorate, which is not preferable. Furthermore, DBP absorption t(AO) is 1
If the OIi is less than 65d/1oOIi, the processability will deteriorate and it is unsuitable. If acetylene gas is added, it will be possible to produce carbon black with more struts than this, but with the oil furnace method alone, the amount of N, S, 40g/g to 6or
r? DBP absorption amount (A
0) exceeds 210 m 17100 N, it is extremely difficult at the current technological level.
A in the present invention due to reasons such as difficulty in controlling the specific surface area) and controlling the removal of fine coke mixed in, and the inability to operate for a long time due to coke accumulation in the manufacturing equipment.

The upper limit of is limited to 210d/100N.

Furthermore, when the %Al/AQO value increases by more than 0.8p, that is, the proportion of temporary structures in the total structure decreases, the dispersion rate of carbon black into the elastomer decreases, which further affects the extrusion properties, S , the processing characteristics deteriorate.

Calculation 24M4DB as a desirable requirement in the present invention
The value of ΔA, the difference between the P absorption amount, A2, and the measured 24M4DBP absorption amount, is determined by the fact that the larger this value is, the larger the proportion of temporary structures in all stractures is, and the smaller the bonding strength of permanent stractures is. This indicates that ordinary commercially available carbon black has a value of -6 to +6, but in addition to the main requirements of carbon black, the present invention reduces At value and A3 value by 10 or more, compared to carbon black-containing elastomer. When a large deformation is applied, partial failure of the MAS of the temporary structure and the permanent structure easily occurs.91 By preventing local stress concentration, the fracture strength, especially the tensile strength, of the elastomer composition can be reduced. Since it contributes to improving the fracture strength associated with the mechanism, it becomes an even more preferable carbon black. However, when increasing the number from 6 to 30, other reinforcing properties, such as wear resistance, are significantly reduced, which is not preferable.

Each property of the carbon black according to the present invention is measured as follows.

N25A: Determined by ASTM, D-3037 from chloride adsorption, rr? /! It represents the specific surface area of carbon black expressed in l.

DBP absorption 1 (Ao): Indicates the DBP absorption lid of carbon black measured according to JIS-6221, and is used to evaluate the stracture of carbon black. Normal absorption amount per 100g, me / 10 Q F
024M4DBP absorption amount expressed in l (A,): ASTM D349
3, the sample carbon black was heated in a cylinder at 16
Measure the amount of DBP absorbed after returning the compressed -11 comb 4 times at a pressure of 8'Ikf/crll (24000pill).

24MIDEP absorption (AI): Measure the DBP e and yield after compressing sample carbon black once at 1687 kP/i (24000 pal).

As mentioned above, the carbon black according to the present invention has a much higher struc- ture than ordinary carbon black, and has a temporary structure that is easy to disintegrate due to weak physical bonds such as van der Waals-London forces. By adjusting the structure to a certain range, it is possible to significantly improve the processing q# properties such as extrusion speed, D, S, and dispersibility while retaining the above-mentioned advantages of increasing the structure. Furthermore, by using the carbon black of the present invention with increased stracture, the specific gravity of the elastomer with the same hardness can be lowered, making it possible to increase the amount of oil blended, resulting in weight reduction and cost reduction. It also has the advantage of being measurable.

Therefore, the carbon black according to the present invention exhibits the various effective performances described above and is suitable as a reinforcing filler for, for example, industrial rubber S@. Patent No. 1059 for the purpose of
It is manufactured using the same manufacturing equipment and according to the same manufacturing method as used in the manufacturing method of Invention No. 132 (Japanese Patent Publication No. 54-38068, applicant: Asahi Carbon Co., Ltd.).

That is, in the invention of Patent No. 1059132, a nearly cylindrical furnace-type carbon black manufacturing furnace lined with a refractory material is used, and hydrocarbon feedstock oil is continuously injected from the tip of the furnace in the axial direction inside the furnace. At the same time, fuel and air are introduced into the furnace from the tangential direction of the side wall of the furnace head, creating a swirling flow (forward swirling flow) created by high-temperature combustion gas.
, and the swirling flow is caused to swirl (
Further air is introduced to create a turbulent atmosphere consisting of high-temperature combustion gas, so that the injected raw material oil comes into contact with the high-temperature combustion gas flow in the turbulent atmosphere, and is thermally decomposed. The carbon black suspension is produced by quenching the hot gas stream to stop the reaction and then collecting carbon=12-black. In addition, in Example 1 of this patented invention, the inner diameter of the cylindrical manufacturing furnace is 60 cm, and the inner diameter of a pair of fuel and air introduction channels (forward tangential air introduction channels) provided in the tangential direction of the side wall of the furnace head is 5 cm.
A manufacturing device in which the inner diameter of a pair of air introduction passages (reverse direction tangential air introduction passages) provided at a center-to-center distance of 15 m from the introduction passage in the tangential direction of the side wall of the reactor head is 5 ts. is used.

In this patented invention, the combustion zone at the head of the furnace becomes a disturbed atmosphere consisting of high-temperature combustion gas due to the fuel and air introduced in the forward direction and the air introduced in the reverse direction, and the fc is injected into this atmosphere. The raw oil droplets are thermally decomposed in the combustion zone and the reaction zone connected thereto, and the subsequent reaction produces carbon black with sufficiently developed struts, and the carbon black produced in this way is protected from secondary thermal alteration. Then, the reaction is stopped by water pressure from a quenching device installed in a cooling zone connected to the rear end of the reaction chamber, together with high-temperature gas, to a temperature of 1000°C or less, usually 400 to 600°C. It looks like this. In addition, according to this patented invention, as described in the patent publication, the total air supply 1 (kl
-/H) and forward tangential air volume (ky/'
There is an advantage that the quality properties of carphone black can be controlled to a desired value by setting various combinations of increasing/decreasing operations of the ratio of K) and reverse tangential air volume (ky/H). It is suitable for producing carbon black according to the present invention. However, in the present invention, applying a raw material oil having a high BMCI value as shown in the examples below to the above-mentioned production method is more suitable for producing carbon black having specified physical property values.

EXAMPLES The present invention will be explained in more detail with reference to Examples below.

Example The carbon black according to the present invention and the carbon black for performance comparison were used in the same apparatus as that used in Example 1 described in the above-mentioned patent publication of the Tokusho No. The diameter was twice as large as LOclt) and was manufactured according to the manufacturing method of the patented invention.

The raw material oil having the properties shown in Table I was used, and the operating conditions of the production equipment were set as shown in Table II.

As shown in Table H, the feedstock oil is heated and injected under pressure from the furnace tip in the axial direction of the furnace, and the fuel is injected into the furnace head from the same introduction path along with forward tangential air for combustion. I loaded it while doing so.

The carbon black-containing hot suspension gas stream was quenched with water at a quenching position 50 to 6.0 m away from the feedstock injection position.

The physicochemical properties of the produced carbon black are 15- They are summarized in Table 1.

The carbon blacks of Examples Run A 1 to 5 in Table - ■ have the main requirements Al Z AO ratio and desirable requirements Δ, -
Eighth, both requirements within the range of 10 to 30 are satisfied, and Example Ru
n A 6 carbon black is A, /A.

Satisfies the ratio, but desirable requirements A2-A, = 10 to 30
However, the carbon of Comparative Example (7) does not satisfy the main requirements of Al/AO.

In addition, for comparison, Table -■ shows the product name of Asahi Carbon Co., Ltd.; Asahisu 60H (ASTM, N-568 equivalent MAF)
Also listed is industrial standard carbon black (IRB Ken 5).

In order to evaluate the performance of the carbon black shown in Table I, a rubber composition t- was prepared with the compounding ratio shown in Table II and subjected to various tests.

Part I of Table 1 shows the compounding conditions for a constant blending of 50 parts by weight of carbon black to 100 parts by weight of rubber. The blending conditions for 9t* are shown by varying the blending amount of the sample carbon black so that the hardness is equivalent to that of the other blends.

The performance of each rubber compound was evaluated by p measurement under the rubber property test conditions of GI.

Rubber property test conditions - Vulcanization of compound: 145°C for 30 minutes - Extrusion test: Measured according to A8TM D2230-17-A method, D, 8. (%) is expressed by the following formula % ■ Dispersibility $ Measured according to ASTM p26aa-a9-n method ■ Other rubber properties: Measured according to JIS K6301 vulcanized rubber physical test method Regarding the rubber properties of each carbon black, Table -
The results are summarized in ■ and Table -■.

Table -■ shows the rubber properties corresponding to Part I of Table -■, and shows that the carbon black of the present invention has extrusion properties (D, S, and extrusion speed) compared to MAF (N-568 equivalent product). ) and dispersibility. In addition, in the carbon black of the present invention, since the hardness and 300% tensile stress are significantly improved, it is understood that it is possible to use a low compounding amount to obtain a rubber compound with the same hardness.

Table -■ shows the rubber properties corresponding to (■) in Table -■.

(a) Extrusion properties: Runs A 1 to 5 do not struggle even with a low blended weight of carbon black, and are superior to MAF (N-568 equivalent product) in both D, S, and extrusion speed.

Run 46 lines, △A is desirable requirement This characteristic is not satisfied. It is slightly inferior by 1.

Since Run A 7 does not satisfy the main requirement, it is even worse than Run A 6 in this characteristic.

(0) Specific gravity: Run A 1 to 6 and comparative example (
7) Both have lower grain values than MkFCN-568 (equivalent to MkFCN-568), contributing to weight reduction of the rubber compound.

(/1 tensile strength: Run 41~ft and comparative example (
7) Both are excellent in this property.

Overall, in order to maintain the reinforcing effect (tensile strength) above a certain level and improve the extrusion characteristics and dispersibility, which also contribute to processing performance, Run A 1,
2. , 4 and 5 must be satisfied. That is, R
Looking at un A l & M4, the tensile strength is MAF
Therefore, it is necessary to set the N and SA level to `f40d11 or higher. However, the N25A level is 60 m /1
1 (RunA2, A5), the dispersibility approaches MAF and there is no improvement effect, so 60 go/g
can be considered the limit.

Looking at Run A 2, the extrusion properties are close to MAF and the same improvement effect is reduced, so the DBP level 'J&:
It can be seen that it has to be 1651Ll/100Ii or more.

Although Comparative Example (7) satisfies the above-mentioned physicochemical properties, it does not satisfy the main requirement of A, /Ao ratio, so its extrusion properties are lower than that of MAF. Regarding this characteristic, Run A 6, which satisfies the main requirements but does not satisfy the desirable requirements, is improved to better than Comparative Example 7, but is only about the same as MAF. However, Run Muro has significantly improved tensile strength compared to MAF, and also significantly contributes to lowering the specific gravity (lightening) of the compound.

As is clear from Run A4, which is close to the lower limit of the AIZAo ratio, the A1/AQ ratio is lower than 065 and 2
0- then 300% tensile stress decreases considerably, so MAF
It is no longer possible to maintain the reinforcing properties of industrial rubber members using this material.

(Margin below) Table −■ (Coal-based carbon black oil)

Claims (1)

[Claims] 1. Is the nitrogen adsorption specific surface area (N28A) 40 to 60n?
/ t, dibutyl phthalate) (1) BP) absorption t(
It is a car 2 resin with an Aol of 165 to 210 m1/100f, and has a 24 MI DEP absorption capacity (
The ratio AI/ of the value of A, l and the value of A0 is 0.65
In the range of ~0.80, AO and flf? Characteristic high structure carbon black. Calculation using quadratic formula 24 M 41) B P value (A, ) A2=-0,59+0.229 (N28
A) 10.918 (AO) 2.045X10-aX
(A.)'' and the actually measured 24MJDBP value (A,) (AvAsl) is in the range of 10 to 30.