CN110964235A

CN110964235A - Working sole rubber composition for mine

Info

Publication number: CN110964235A
Application number: CN201911338366.9A
Authority: CN
Inventors: 张炫辉; 段徐宾; 王智; 李幸; 闫文飞; 丁杨; 曾建伟; 王文琪
Original assignee: China Leather and Footwear Research Institute Jinjiang Co Ltd
Current assignee: China Leather and Footwear Research Institute Jinjiang Co Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-04-07

Abstract

The invention discloses a working sole rubber composition for mines, which comprises the following raw material components in parts by weight: 70-90 parts of styrene-butadiene rubber, 10-30 parts of nitrile rubber, 4-12 parts of bentonite, 30-44 parts of furnace carbon black, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 3-10 parts of dioctyl phthalate, 3-10 parts of N- (1, 3-dimethyl) butyl-N' -phenyl p-phenylenediamine, 1-3 parts of 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer, 0.5-3 parts of microcrystalline wax, 1.1-2.5 parts of sulfur, 1-3 parts of N-cyclohexyl-2-benzothiazole sulfonamide and 0.1-1 part of tetramethyl thiuram disulfide. The safety shoe can better protect the safety of the soles of mining workers in a harsh environment, thereby improving the safety and prolonging the service life of the working shoes.

Description

Working sole rubber composition for mine

Technical Field

The invention relates to the technical field of rubber materials for working shoes, in particular to a rubber composition for a working sole for a mine.

Background

The working shoes are the shoes products which are applied to specific working conditions, protect the safety of the soles and play a role in protection in the working process. The working shoes for mines are special shoes applied to outdoor mining operation environments. Mine environment pavements are often complex, accompanied by sharp rock sections and sharp stones in addition to soil. Therefore, the work shoes for this work environment are required to have outstanding cut resistance in addition to certain wear resistance and skid resistance.

At present, the working sole materials mainly use rubber, thermoplastic elastomer, polyurethane and the like, each material has respective advantages and disadvantages, the existing working sole materials pay more attention to the functions of wear resistance, skid resistance, oil resistance, static resistance and the like, and have no outstanding cutting resistance, so the working sole materials cannot be used as the working shoes for mines.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a rubber composition for a working shoe sole for a mine, which can better protect the safety of the sole of a mining worker in a harsh environment, thereby improving the safety and the service life of a working shoe.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme.

The mining work sole rubber composition comprises the following raw material components in parts by weight: 70-90 parts of styrene-butadiene rubber, 10-30 parts of nitrile rubber, 4-12 parts of bentonite, 30-44 parts of furnace carbon black, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 3-10 parts of dioctyl phthalate, 3-10 parts of N- (1, 3-dimethyl) butyl-N' -phenyl p-phenylenediamine, 1-3 parts of 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer, 0.5-3 parts of microcrystalline wax, 1.1-2.5 parts of sulfur, 1-3 parts of N-cyclohexyl-2-benzothiazole sulfonamide and 0.1-1 part of tetramethyl thiuram disulfide.

The technical scheme of the invention has the characteristics and further improvements that:

preferably, the sulfur is oil-extended sulfur powder.

Preferably, the furnace carbon black is N375 or N234.

Compared with the prior art, the invention has the beneficial effects that:

(1) the cutting resistance and the anti-chipping performance are good. The cutting resistance and the anti-chipping performance of the working shoe are improved by adopting the styrene butadiene rubber and the nitrile butadiene rubber with larger side groups; the bentonite with the sheet structure is adopted to slow down and prevent the micro-crack expansion after the sharp object is pierced, and the cutting resistance and the piercing resistance of the working shoe are improved.

(2) The wear resistance is good. The wear-resisting property of the sole material is improved by adopting the nitrile rubber and the high wear-resisting furnace carbon black.

(3) The skid resistance is better. Better anti-skid performance is realized by adopting styrene butadiene rubber as a matrix main rubber.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.

Example 1

A rubber composition for a working sole for a mine comprises the following components in parts by weight:

example 2

example 3

example 4

example 5

comparative example 1

The rubber composition comprises the following components in parts by weight:

comparative example 2

The rubber composition comprises the following components in parts by weight:

comparative example 3

The rubber composition comprises the following components in parts by weight:

using the rubber compositions obtained in example 1 and comparative example, vulcanization was carried out to obtain a work shoe sole material, and the properties thereof were measured, and the results are shown in Table 1 below:

table 1 comparison of the properties of example 1 with comparative example 1

Item	Unit of	Example 1	Comparative example 1	Comparative example 2	Comparative example 3
						Density of	g/cm³	1.17	1.17	1.17	1.18
Hardness (Shore A)	/	69	68	68	71
						Tensile strength	MPa	23.1	22.4	22.1	20.3
Elongation at break	％	638	581	675	448
						Tear strength	MPa	105	98	101	112
Akron abrasion	cm³/1.61km	0.141	0.164	0.189	0.096
						Non-slip properties (Dry/Wet)	/	0.9/0.5	0.8/0.5	0.9/0.5	0.6/0.3
Loss factor tan delta at 0 DEG C	/	0.5427	0.5112	0.5447	0.4723
						Rotatory mass of 0 ℃ viscous modulus E	/	14.7615	12.4471	12.9647	10.8164
Cut resistance	g	0.6651	0.9255	0.7538	1.5422

The performances of the rubber compound are tested according to national standards or industrial standards, and the vulcanization condition of the rubber compound is 150 ℃ multiplied by 30 min; wherein, the antiskid performance adopts a general shoe test method GB/T3903.6-2017 to test the dynamic sliding friction coefficient, the stone slab interface and the third-level water; the dynamic mechanical property test adopts a dynamic viscoelastic analyzer (DMA) produced by the German GABO company to carry out temperature scanning test on vulcanized rubber in a stretching mode, wherein the frequency is 10Hz, the static strain is 3 percent, the dynamic strain is 1 percent, and the heating rate is 2K/min. (ii) a The cutting resistance is tested by an RCC-I type rubber dynamic cutting test machine produced by Beijing Wanhui science and technology development Limited company, the rotating speed is 725r/min, the cutting frequency is 100 times/min, the testing time is 30min, and the smaller the cutting resistance testing weight result is, the better the performance is.

As can be seen from the above Table 1, in comparison with the comparative example 1, the cutting resistance and the dry skid resistance of the material added with bentonite are respectively improved by 18.6% and 12.5%, the wear resistance is reduced by 15.2%, and the wet skid resistance is unchanged in the comparative example 2. Compared with the comparative example 1, the wear resistance of the material using the nitrile rubber as the matrix main rubber is improved by 41.5%, but the cutting resistance, the dry sliding performance and the wet sliding performance are respectively reduced by 66.6%, 25% and 40%. Compared with the comparative examples 1 to 3, the wear resistance and the dry-skid performance of the example 1 are improved and the wet-skid performance is unchanged compared with the comparative example 1; compared with the embodiment 2, the wear resistance of the embodiment 1 is improved, and the anti-skid performance is unchanged; compared with the embodiment 3, the antiskid performance of the embodiment 1 is improved, and the wear resistance is reduced; however, the cutting resistance of the steel plate in example 1 is respectively improved by 28.1%, 11.8% and 56.9% compared with that of the steel plate in comparison 1-3, and the cutting resistance effect is obvious.

The trends in the properties of the working shoe sole materials obtained by vulcanizing the rubber compositions obtained in examples 2 to 5 were in accordance with those of example 1.

In the above examples, the styrene-butadiene rubber is a random copolymer of butadiene and styrene, and is the synthetic rubber with the largest yield and consumption at present. The styrene butadiene rubber has an irregular molecular structure, is not easy to crystallize, belongs to non-self-reinforcing rubber, is not easy to plasticate, and has poor molecular chain flexibility, large steric hindrance and large intramolecular friction due to the existence of vinyl and benzene rings in side groups. The styrene butadiene rubber has the advantages of excellent wet skid resistance, wear resistance, reversion resistance, initial crack resistance, cutting resistance and the like.

In the above embodiments, the nitrile rubber has a cyano side group in the molecular structure, and has a large steric hindrance and a large intramolecular friction. The nitrile rubber has the outstanding advantages of excellent oil resistance, high tearing strength and wear resistance, good heat resistance and air tightness, strong bonding force and the like, can make up the defects of other rubbers when being used together with other rubbers, and plays a synergistic role.

In the above examples, the furnace carbon black is a trackless chain-like or grape-like aggregate formed by stacking graphitized flaky microcrystalline particles, and has a higher reinforcing effect than white carbon black. The smaller the carbon black grain diameter is, the higher the structure is, and the tensile strength, the tearing strength, the wear resistance and the like are obviously improved.

In the above embodiment, the bentonite has a special lamellar structure, and has good gas barrier property and heat resistance in compounding with rubber, and meanwhile, the filler of the lamellar structure usually has a function of hindering the micro-crack propagation in the rubber damage process, so that the fatigue resistance and the cutting resistance of the rubber material of the working sole are improved.

In conclusion, the cutting resistance, the pricking resistance and the anti-chipping performance are realized by introducing the styrene butadiene rubber, the nitrile butadiene rubber and the flaky bentonite into the working sole material; the wear resistance is improved by introducing the nitrile rubber and the high wear-resistant furnace carbon black; the anti-skid performance is realized by introducing styrene butadiene rubber; the physical and mechanical properties of the product are improved by optimizing the regulation and control of the working sole material formula system, and the safety of the soles of mining workers can be better protected in a harsh environment, so that the safety and the service life of the working shoes are improved.

Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The mining work sole rubber composition is characterized by comprising the following raw material components in parts by weight: 70-90 parts of styrene-butadiene rubber, 10-30 parts of nitrile rubber, 4-12 parts of bentonite, 30-44 parts of furnace carbon black, 1-5 parts of zinc oxide, 1-3 parts of stearic acid, 3-10 parts of dioctyl phthalate, 3-10 parts of N- (1, 3-dimethyl) butyl-N' -phenyl p-phenylenediamine, 1-3 parts of 2,2, 4-trimethyl-1, 2-dihydroquinoline polymer, 0.5-3 parts of microcrystalline wax, 1.1-2.5 parts of sulfur, 1-3 parts of N-cyclohexyl-2-benzothiazole sulfonamide and 0.1-1 part of tetramethyl thiuram disulfide.

2. The rubber composition for work shoe soles for mines according to claim 1, wherein the sulfur is oil-extended sulfur powder.

3. The rubber composition for mine work shoe soles according to claim 1, wherein said furnace carbon black is N375 or N234.