CN1368518A - Rubber composition as rubber pad under rail - Google Patents

Abstract

A composite rubber used as rubbe pad under rail contains matrix rubber 100 portions, promoter 1-5 portions, antiageing agent 1-3 portions, nanometre zinc oxide powder 2-10 portions, sulfurizing agent, 0.2-1.5 portions carbon black 30-60 portions, inorganic filler 30-60 portions, tetra-acicular zinc oxide eshisker 0.5-10 portions and coupling agent 0.2-5 portions. The said matrix rubber consists of natural rubber, styrene-butadiene rubber and cis-1,4-polybutadiene rubber. Its advantages are high static rigidity (50-70 mN/m), tensile strength, antiwear performance, vibration attenuation coefficient and noise-reducing effect.

Description

Rubber composition as rubber pad under rail

Technical field

The present invention relates to a kind of material compositions, particularly relate to a kind of rubber composition as rubber pad under rail.

Background technology

The ubiquitous outstanding problem of railroad track is that orbit rigidity is bigger than normal now, the logy problem of circuit, this causes that the vibration of wheel rail system and sound nuisance are on the rise, and shows as track early damage, component life shortening, line conditions deterioration, maintenance cost greatly.Simultaneously, make near railway facility along the line be damaged the dried environment of scratching, the development of influence speed-raising and high-speed railway to vibration sensing.For properly settling this problem, the railway expert thinks both at home and abroad, is necessary to manage to reduce orbit rigidity, improves circuit elasticity, and the measure of adopting is that the resilient rubbber cushion plate is set under rail usually.The vertical elasticity of concrete crosstie track mainly is to be provided by rubber tie plate under rail.Rubber tie plate under rail is as the important composition parts of rail fastening, and its performance and state not only are related to the reliability of rail fastening node work, also is related to the ride comfort on train rail road, is arranging the economy of maintenance manipulation.At present, being extensive use of concrete crosstie with the subject matter that 60-10-11 type rubber tie plate under rail exists is, rigidity is excessive (to be generally 100～120MN/m), aging fast (use that its rigidity of some months is generally 150～200MN/m), poor, the life-span short (mean life was less than 5 years) of wear-resisting withstand voltage properties, fail to give full play to its buffering and damping effect in track structure.Though the way with many flutings can reduce rigidity, quickened the aging and destruction of rubber bearing.Chinese patent CN1230565 discloses a kind of rubber-base composite material, it is to add to have 3 D stereo four acicular zinc oxides crystals whisker in traditional rubber compounding, wherein each component concentration is, rubber 60～90%, promotor 0.1～1.0%, anti-aging agent 0.5～1.5%, oxide powder and zinc 2～10% sulphur 2～10%, ZnOw 1～30%.Be mainly used in the wear-resisting and anti-slip rubber goods of preparation, as doughnut, brake material etc.

Summary of the invention

The object of the present invention is to provide a kind of material mechanical performance, ageing resistance, wear resisting property and vibration and noise reducing performance to increase substantially, as the rubber composition as rubber pad under rail of railway rubber tie plate under rail.

Its component of rubber composition as rubber pad under rail of the present invention comprises matrix sizing material 100, promotor 1～5, anti-aging agent 1～3, nano zinc oxide powder 2～10, vulcanizing agent 0.2～1.5, carbon black 30～60, mineral filler 30～60, four acicular type zinc oxide crystal whisker 0.5～10 and coupling agent 0.2～5 by weight.The matrix sizing material is made up of natural rubber, styrene-butadiene rubber(SBR) and cis-1,4-polybutadiene rubber, and its cooperation ratio is by weight, 10～30 parts of natural rubbers 40～80, styrene-butadiene rubber(SBR) 10～30, cis-1,4-polybutadiene rubber.Wherein, promotor is rubber promotor commonly used, as CZ, NOBS, short M etc.; Anti-aging agent is a rubber anti-aging agent commonly used, as antioxidant A, anti-aging agent B, anti-4010, shockproof 4010-NA etc.; Vulcanizing agent is sulphur, peroxidation phenylformic acid etc.; Mineral filler is one or more in kaolin, white carbon black and the lime carbonate; Four acicular type zinc oxide crystal whisker is pressed the prepared among the Chinese patent ZL97107607.3, have special 3 D stereo four acicular structures, every long 10～200 μ m of needles, base diameter 0.1～10 μ m, need during use to carry out surface treatment with coupling agent, processing mode is, earlier with 0.3～5% titante coupling agent, acetone soln (or other solvent such as ethanol etc.) as NDZ-201, NDZ-101 carries out surface treatment to it, to improve the system consistency.Also available other type coupling agent of surface treatment is as silicane A-189, A-845-4, Si-69, KH-560, KH-590 etc.Processing mode can first pre-treatment, also coupling agent can be joined in the component mixing together, but the former better effects if; Nano zinc oxide powder makes as follows: with the zinc nitrate is main raw material, as precipitation agent, obtains presoma through chemical reaction with urea in 70～100 ℃ of aqueous solution, in 200～400 ℃ of roasting temperatures 1～3 hour, makes nano zinc oxide powder again.Nano zinc oxide powder is a spherical particle, mean diameter 20～40 μ m.

The advantage of rubber composition as rubber pad under rail of the present invention is, with natural rubber, styrene-butadiene rubber(SBR) and cis-1,4-polybutadiene rubber be matrix rubber composite and the prescription in added four acicular type zinc oxide crystal whisker and nano zinc oxide powder, make the quiet rigidity of gained rubber pad placed under-neath rail plate remain on 50～70MN/m, compare with existing rubber tie plate under rail, its mechanical property, ageing resistance, wear resisting property and vibration and noise reducing performance etc. have all obtained significant raising.

Specific embodiments

Fig. 1: the electron photomicrograph of ZnOw

Fig. 2: through the electron photomicrograph of coupling agent surface treatment rear oxidation zinc whisker

Fig. 3: nano zine oxide electron photomicrograph

The composition of the matrix sizing material of embodiment 1～4 and comparative example 1～3 by weight, 10 parts of 70 parts of natural rubbers, 20 parts in styrene-butadiene rubber(SBR) and cis-1,4-polybutadiene rubbers.All the other prescriptions all by weight, and are as shown in table 1.Its preparation process is, makes solvent with acetone titanate coupling agent is mixed with 1% solution, puts into ZnOw, soaks 30 parts of clocks, take out dry after, baking 40 minutes is standby under 130 ± 5 ℃ of temperature.With natural rubber with mill plasticate to mooney viscosity less than 60, add styrene-butadiene rubber(SBR), cis-1,4-polybutadiene rubber, filler and other auxiliary agent successively, mixing even back adds pretreated ZnOw and nano zine oxide powder, mixing under the bag roller state to even, get rubber composition as rubber pad under rail, parked after the slice 6 hours, and under 145 ℃ of temperature, vulcanized 20 minutes, be shaped to Rubber sleeper pad with vulcanizing press.It is as shown in table 1 that it detects performance index.

The same embodiment of the preparation technology of comparative example does not just add ZnOw and nano zine oxide powder in prescription, it is as shown in table 1 that it detects performance index.

Table 1: rubber composition as rubber pad under rail prescription (by weight) and performance

		Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Comparative example 1	Comparative example 2	Comparative example 3
									Prescription	Rubber	???100	??100	??100	??100	??100	??100	????100
Promotor	???NOBS ???2.5	??CZ ??2.5	Short M 2.5	??NOBS ??2.5	??NOBS ??2.5	??NOBS ??2.5	????NOBS ????2.5
								Anti-aging agent		???4010 ???1.2	??4010-NA ??1.2	Anti-A 1.2	Anti-D 1.2	??4010 ??1.2	??4010 ??1.2	????4010 ????1.2
Zinc oxide	Nano-ZnO 2	Nano-ZnO 3	Nano-ZnO 2	Nano-ZnO 2.5	Common ZnO 5	Common ZnO 14	Common ZnO 5
								Sulphur		???1.3	??1.3	??1.3	??1.3	??1.3	??1.3	????3
Carbon black	???45	??42	??41	??39	??45	??41	????60
								Mineral filler		Kaolin 42	Lime carbonate 42	White carbon black 40	Kaolin 39	Kaolin 42	Lime carbonate 42	Kaolin 60
Zinc oxide must be brilliant	???3	??6	??9	??12	??0	??0	????0
								Coupling agent		???NDZ-201 ???0.2	??Si-69 ??0.3	??Si-69 ??0.5	??KH-590 ??0.6
Performance	Hardness (shore A)	???72	??73	??74	??75	??68	??70										????80
								Tensile strength (MPa)	???16.7	??17.4	??18.2	??18.8	??14.8	??15.0	????13.6
	Elongation at break (%)	???405	??398	??387	??372	??412	??385									????278
								200% stretches (MPa) surely	???9.6	??9.7	??9.9	??10.6	??9.2	??9.3	????10.2
	Compression set (%)	???25.4	??25.2	??25.6	??25.8	??28.4	??28.6									????28.8
								Akron abrasion (cm 3/1.61km)	???0.32	??0.28	??0.22	??0.19	??0.54	??0.51	????0.65
	Quiet rigidity (MN/m)	???52.5	??56.5	??58.2	??62.5	??47.3	??47.8									????118.0
								The aging back of 100 ℃ * 72h strength degradation (%)	???21.2	??18.3	??15.1	??13.6	??32.1	??29.2	????35.6
	Noise reduction (relative value)	???1.05	??1.09	??1.13	??1.18	??1.00	??1.01									????0.88
								The vibration damping coefficient	???0.28	??0.31	??0.35	??0.42	??0.23	??0.24	????0.18

Claims (3)

1, a kind of rubber composition as rubber pad under rail, its component comprises the matrix sizing material, promotor, anti-aging agent, vulcanizing agent, carbon black, mineral filler, coupling agent and four acicular type zinc oxide crystal whisker, it is characterized in that also containing in the component nano zinc oxide powder, the cooperation ratio by weight, 100 parts of matrix sizing materials, 1～5 part of promotor, 1～3 part in anti-aging agent, 2～10 parts of nano zinc oxide powders, 0.2～1.5 part of vulcanizing agent, 30～60 parts of carbon blacks, 30～60 parts of mineral fillers, 0.5～10 part of four acicular type zinc oxide crystal whisker, and 0.2～5 part of coupling agent, wherein, the matrix sizing material is by natural rubber; styrene-butadiene rubber(SBR) and cis-1,4-polybutadiene rubber are formed; its cooperation ratio is natural rubber 40～80 by weight; styrene-butadiene rubber(SBR) 10～30; 10～30 parts of cis-1,4-polybutadiene rubbers.

2, rubber composition as rubber pad under rail as claimed in claim 1 is characterized in that four pin ZnOws need to carry out surface treatment with coupling agent.

3, rubber composition as rubber pad under rail according to claim 1 is characterized in that mineral filler is one or more in kaolin, white carbon black and the lime carbonate.

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