CN106279797A

CN106279797A - A kind of Low-rolling-resistantire tire tread rubber composition and the tire of manufacture thereof

Info

Publication number: CN106279797A
Application number: CN201610595437.3A
Authority: CN
Inventors: 郑兴荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-07-18
Filing date: 2016-07-18
Publication date: 2017-01-04
Anticipated expiration: 2036-07-18
Also published as: CN106279797B

Abstract

The present invention relates to the tire of a kind of Low-rolling-resistantire tire tread rubber composition and manufacture thereof, the raw material comprising following weight portion meter: natural rubber STR20 is 50～70, solution polymerized butadiene styrene rubber SSBR4525 is 0～30, neodymium series butadiene rubber BunaNd22EZ is 0～20, guayule is 0～10, white carbon black ECORAX1670 is 20～35, white carbon ULTRASIL 5000GR is 20～35, silane coupler Si69 is 1.5～3.0, silane coupler KH580 is 0.2～0.4 etc.；Its preparation method is: prepared by guayule, the operation such as mixer mixing, mill mixing, prepares Low-rolling-resistantire tire tread rubber composition；By tread patterns designed such as annular ribs, transverse pattern, siping, prepare low rolling resistance tyre.The present invention provides the tire of a kind of Tire tread rubber composition and manufacture thereof, by optimizing tyre surface formula, improving calendering process, improvement tread contour, and make three organically combine, while ensureing the performances such as tyre surface earth-grasping force, wearability and anti-slippery, reduce tire drag.

Description

A kind of Low-rolling-resistantire tire tread rubber composition and the tire of manufacture thereof

Technical field

The present invention relates to a kind of tire, specifically a kind of Low-rolling-resistantire tire tread rubber composition and manufacture thereof Tire, belong to tyre technology.

Background technology

It is known that flourish along with automobile industry, fossil fuel day by day exhausted, and people are to environmental protection and energy saving The enhancing day by day of consciousness, the fuel oil consumption how reducing automobile becomes automobile industry focus of attention.Along with 2012, European Union was real Execute mandatory tire tag regulation, reduce tire drag and become a hot issue of tyre industry, the rolling resistance of tire The oil consumption that power causes accounts for the 15% of total oil consumption, if tire drag reduces by 30%, then reduces oil consumption 4.5%.At all compositions In the parts such as the tyre surface of tire, sidewall, carcass, the resistance to rolling only produced by tyre surface accounts for about 50%, so research and development tire Face, the resistance to rolling reducing tire is one of important measures reducing vehicle fuel consumption.

Being found by Indexing of Scien. and Tech. Literature, tire enterprise is mostly from tyre surface formula, preparation method and tyre surface the most both at home and abroad The one side of decorative pattern or two aspect researchs reduce tire drag, seldom from optimize tyre surface formula, improve calendering process and Improve three aspects of tread contour to start with simultaneously, make three organically combine, reduce the purpose of tire drag.

By retrieval, find following two patent publication us relevant to present patent application.

1, a kind of super Formula of tread of low-rolling-resistantire tire and preparation method thereof and tire disclosed in CN 105670065 A. A kind of ultralow rolling resistance tyre tread mix, this tread rubber is by the mixing system of the raw material including following components in parts by weight : Butadiene-Styrene Rubber 1:40.0-80.0 part；Butadiene-Styrene Rubber 2:10.0-30.0 part；Cis-butadiene cement: 10.0-30.0 part；High dispersive White carbon: 50.0-110.0 part；Aromatic naphtha: 5.0-40.0 part；Silane coupler: 8.0-17.6 part；Diphenylguanidine PG:1.0-4.0 Part；Described high-dispersion white carbon black N2 adsorption specific surface area (NSA) is between 145-200m2/g.Use the wheel of this tread mix Tire resistance to rolling reaches less than 6.0, and the every physical and mechanical properties of sizing material and tire are at a high speed, endurance quality meets normal use will Ask.This patent is by optimizing tyre surface formula, improving calendering process and reduce tire drag.

2, the tire tread of a kind of low-rolling-resistance disclosed in CN104853935A, joins including by least one first rubber The mid portion (I) that mixed thing is made, and include at least one circumference that multiple pieces (1210) being separated by siping are formed Rib (121-123)；By at least one second and the 3rd rubber compounding thing make the first and second lateral parts (II and III), should First and second lateral parts (II and III) include at least that multiple pieces (1310,1410) being separated by siping are formed Individual circumferential rib (131,141)；Wherein said at least one second and the 3rd rubber compounding thing there is the value of tan δ ＜ 0.25 (23 At a temperature of DEG C, under the frequency of 10Hz and 10% elongation), the compound die of at least one the first rubber compounding thing wherein said Amount G* (T) more than described at least one second and the 3rd rubber compounding thing compound die when all temperature of 0 DEG C≤T≤60 DEG C Amount G* (T).This patent is to reduce tire drag by improvement tread contour.

Summary of the invention

The purpose of the present invention is contemplated to overcome the deficiency of existing technique and technology, it is provided that a kind of tire tread rubber combination Thing and the tire of manufacture thereof, start with in terms of optimizing tyre surface formula, improving calendering process and improve tread contour three, make three Organically combine, while ensureing the performances such as tyre surface earth-grasping force, wearability and anti-slippery, reduce tire drag.

The present invention solves above-mentioned technical problem and the technical scheme is that a kind of low rolling resistance tyre tread-rubber combination Thing, comprises the raw material of following weight portion meter:

Natural rubber STR20 is 50～70, solution polymerized butadiene styrene rubber SSBR4525 is 0～30, neodymium series butadiene rubber BunaNd22EZ is 0～20, guayule is 0～10, white carbon black ECORAX1670 is 20～35, white carbon ULTRASIL 5000GR Be 20～35, silane coupler Si69 be 1.5～3.0, silane coupler KH580 be 0.2～0.4, White carbon black dispersant PEG4000 is 0.5～1.5, naphthenic oil NAP10 is 5.0～7.0, tackifying resin Koresin is 3.0～5.0, ZnO-80 is 5.0 ～7.0, stearic acid 1801 be 1.0～3.0, oil-filled type insoluble sulfur S be 1.5～2.5, accelerator TBSI be 1.0～2.0, Captax is 0.3～0.5, antioxidant A W is 0.5～1.5, antioxidant 4020 is 0.5～1.5, anti-scorching agent CTP-80 be 0.3～ 0.5, peptizer DBD is 0.3～0.5；

Described natural rubber STR20, solution polymerized butadiene styrene rubber SSBR4525, neodymium series butadiene rubber BunaNd22EZ, guayule Total number of rubber is 100 parts；

Described white carbon black ECORAX1670, total number of white carbon ULTRASIL 5000GR are 55 parts.

Aforesaid a kind of Low-rolling-resistantire tire tread rubber composition, preferred scheme, comprise following weight portion meter Raw material:

Natural rubber STR20 is 55～60, solution polymerized butadiene styrene rubber SSBR4525 is 20～25, neodymium series butadiene rubber BunaNd22EZ is 15～20, guayule is 0～5, white carbon black ECORAX1670 is 20～25, white carbon ULTRASIL 5000GR Be 30～35, silane coupler Si69 be 2.5～3.0, silane coupler KH580 be 0.3～0.4, White carbon black dispersant PEG4000 is 1～1.5, naphthenic oil NAP10 is 6.0～7.0, tackifying resin Koresin is 4.0～5.0, ZnO-80 be 6.0～ 7.0, stearic acid 1801 be 2.0～3.0, oil-filled type insoluble sulfur S be 2.0～2.5, accelerator TBSI is 1.5～2.0, promotees Enter agent M be 0.4～0.5, antioxidant A W be 1～1.5, antioxidant 4020 be 1～1.5, anti-scorching agent CTP-80 is 0.4～0.5, moulds Solving agent DBD is 0.4～0.5；

Aforesaid a kind of Low-rolling-resistantire tire tread rubber composition, more preferably scheme, comprises following weight portion The raw material of meter:

Natural rubber STR20 is 55, solution polymerized butadiene styrene rubber SSBR4525 is 25, neodymium series butadiene rubber BunaNd22EZ is 15, guayule be 5, white carbon black ECORAX1670 be 20, white carbon ULTRASIL 5000GR be 35, silane coupler Si69 be 3, Silane coupler KH580 is 0.4, White carbon black dispersant PEG4000 is 1.5, naphthenic oil NAP10 is 6, tackifying resin Koresin Be 4, ZnO-80 be 6, stearic acid 1801 be 2.5, oil-filled type insoluble sulfur S be 2, accelerator TBSI be 1.5, captax be 0.4, antioxidant A W be 1, antioxidant 4020 be 1, anti-scorching agent CTP-80 be 0.4, peptizer DBD be 0.4；

Aforesaid a kind of Low-rolling-resistantire tire tread rubber composition, the scheme being more highly preferred to, comprise following weight portion The raw material of meter:

Natural rubber STR20 is 60, solution polymerized butadiene styrene rubber SSBR4525 is 20, neodymium series butadiene rubber BunaNd22EZ is 20, guayule be 0, white carbon black ECORAX1670 be 20, white carbon ULTRASIL 5000GR be 35, silane coupler Si69 be 3, Silane coupler KH580 is 0.4, White carbon black dispersant PEG4000 is 1.5, naphthenic oil NAP10 is 6, tackifying resin Koresin Be 4, ZnO-80 be 6, stearic acid 1801 be 2, oil-filled type insoluble sulfur S be 2, accelerator TBSI be 1.5, captax be 0.4, antioxidant A W be 1, antioxidant 4020 be 1, anti-scorching agent CTP-80 be 0.4, peptizer DBD be 0.4；

Aforesaid a kind of Low-rolling-resistantire tire tread rubber composition: the natural rubber STR20 place of production is Thailand；Contain intermingle with fourth Benzene rubber SSBR4525, neodymium series butadiene rubber BunaNd22EZ are Lanxess Corporation of Germany product；White carbon black ECORAX1670, white carbon ULTRASIL 5000GR is Degussa Products；Silane coupler Si69, silane coupler KH580 are Nanjing dawn chemical industry Product；White carbon black dispersant PEG4000, antioxidant A W are chemical plant, Sinopec Nanjing product；Naphthenic oil NAP10 is Liaohe River stone Change Products；Tackifying resin Koresin is BASF Corp. of Germany's product；Stearic acid 1801 place of production is Malaysia；ZnO-80、 Oil-filled type insoluble sulfur S, accelerator TBSI, captax, antioxidant 4020, anti-scorching agent CTP-80, peptizer DBD are Shandong Yanggu Hua Tai chemical inc product；Guayule resin is non-commercially available prod, and oneself is prepared.

Recent domestic tire enterprise is devoted to guayule resin research and development, reduces natural rubber specific resources Interdependency, avoids its shortage of resources, the surging equivalent risk of price.Being found by research, the rhizome Intradermal of guayule is rich in natural rubber Glue, and within 1 year, just can gather in the crops (cultivation period of current rubber tree is typically for up to 20 years to 25 years) to 2 years, so greatly developing Guayule resin, the second Jiao Yuan of natural rubber, has important strategic importance as an alternative.The most external tire enterprise is Accelerate exploitation guayule resin, achieve phasic results:

(1) " automobile and motion " the 10th phase page 175 " Gu platinum tire guayule substitutes rubber project obtains breakthrough " in 2015: Late August, in year " research and development of the Biomass Energy Technology " meeting that the U.S. holds, the solid platinum tire exhibition of the Cooper U.S. Show from guayule, extracted the natural rubber raw material progress for Tire production project, and be positioned at the north of Texas at it Test center of U.S., its concept tire that multiple parts employ guayule resin raw material completely of rollout carried out dryly, Wetland and the test of cross-country racing track.This plan is the development project that U.S. government's appropriation is dominated by solid platinum tire.

(2) " BRIDGESTONE company develops first " guayule " " petrochemical industry " 2016 the 2nd phase of volume 45 page 187 Natural rubber tire processed ": BRIDGESTONE company is devoted to the research using natural rubber to replace rubber tree, reaches to make tire with this The diversified purpose of material.Company has the most successfully developed in the whole world and has used the natural rubber system extracted from " guayule " The tire become." guayule " natural rubber of this tire used is developed by State of Arizona, US " guayule " research institution , extract whole technical process all use the proprietary technology of BRIDGESTONE company from cultivating to refine.

Aforesaid a kind of Low-rolling-resistantire tire tread rubber composition, effective raw material is as follows:

(1) natural rubber STR20 is three grades of glue of Thailand's standard rubber, is generally used for making Outer Tyre, and its combination property is excellent In synthetic rubber, there is the comprehensive physical mechanical performance of excellence, there is higher elasticity, slightly band plasticity at normal temperatures, have non- The best mechanical strength, hysteresis loss is little, and when repeatedly deforming, heat is low, and therefore its flexible resistance is also fine, electrical insulation capability Well；There is the characteristics such as excellent resilience, insulating properties, water-resisting property and plasticity, of many uses；There is good processing technique Performance, natural rubber is due to relative molecular mass molecular vibrational temperature width high, suitable, and strand is prone to fracture, adds rubber In there is a number of gel molecular, it is easy to carry out plasticating, mixing, extrusion etc..

(2) solution polymerized butadiene styrene rubber SSBR4525 produces tire to have resistance to rolling concurrently little, and anti-slippery is good, and wearability is high and fall The advantages such as low burn oil consumption, be manufacture green tire, non-skid tyre, the contour performance tire of super lightweight tire extraordinary former Material；

(3) neodymium series butadiene rubber BunaNd22EZ modification technology can create long chain branching, thus accelerates filler and rubber Fast and reliable is integrated, and improves processing technique；Additionally, modification technology also enhances the distribution mutually between polymer, filler is in whole refining Therefore dispersion in compound have also been obtained improvement, is the critical material of the high-performance tire producing low-rolling-resistance.

(4) guayule is the part substitution material of natural rubber STR20, reduces production cost, reduces natural rubber special Determine the interdependency of resource.

(5) white carbon black ECORAX1670 is the special white carbon black of the low-rolling-resistance for tire tread that Degussa company produces, Combined by physical absorption, be well applied to tire tread.

(6) white carbon ULTRASIL 5000GR disperses more uniform in sizing material, compared with traditional carbon black filled glue, White carbon is filled glue and is had preferable wet-sliding resistant performance and relatively low resistance to rolling, becomes the main stuffing manufacturing green tire.

(7) silane coupler Si69 and silane coupler KH580 use, effectively strengthen between rubber and filler is mutual Effect, improves white carbon black and white carbon dispersion in rubber；White carbon is carried out surface modification, reaches optimum coupling effect.

(8) White carbon black dispersant PEG4000 accelerates white carbon mixing speed, makes white carbon reach optimal dividing in sizing material Dissipate effect.

(9) antioxidant A W is prevented from the be full of cracks that tyre surface is caused by ozone, is particularly well-suited to the such dynamic condition of tyre surface The rubber of lower use；With antioxidant 4020 with the use of, strengthen its usefulness.

(10) naphthenic oil NAP10 is environmental tire rubber oil product, has naphthene content high, with natural rubber, butylbenzene Rubber, butadiene rubber no-float, have the most resistance to ability subduing, dropping compression heat generation, can significantly reduce the spies such as resistance to rolling Point；Achieve the tire oil application in rubber for tire industry of cycloalkyl first, and take the lead in obtaining European Union's ring at home Protect monitoring certification.

(11) quasi-viscous effect of tackifying resin Koresin is preferable, and tack retention hour is longer, it is possible to sizing material is greatly reduced Mooney viscosity, increase the dispersion of elastomeric compound of sizing material；Improve the process industrial art performance of sizing material, be that reasonable processing helps Agent；Affecting less on the curability of sizing material, the raising to vulcanizating glue physical performance is relatively large, has good comprehensive Energy.

(12) stearic acid 1801 place of production is Malaysia, is the stearic primes of import, and nontoxic, iodine number is relatively low, purity Higher, be natural gum, rubber polymer vulcanizing activator it can also be used to plasticizer, also serve as softening agent.

(13) ZnO-80 is a kind of pre-dispersed extraordinary zinc oxide being applicable to rubber industry, is new type rubber processing aid； Replace traditional ZnO powder with it, dust pollution can be reduced, it is easy to dispersion, reduce energy consumption, it is achieved energy-saving and emission-reduction；It is natural Rubber and the vulcanizing activator of dience rubber, can improve the crosslink density of vulcanizate, optimize vulcanizate tensile property, resistance to always Performance and anti-wear performance so that it is there is relatively low resistance to rolling and heat.

(14) oil-filled type insoluble sulfur S has good dispersive property in the sizing material course of processing, in higher processing temperature Under degree, there is high thermal stability, be not susceptible to heat and revert, effectively prevent sizing material crocking, when postponing bin aging incipient scorch to greatest extent Between, it is to avoid produce prevulcanization, improve process safety.Oil-filled contribute to improving product operation environment, reduce flying upward property of powder.

(15) accelerator TBSI is a kind of novel environmental protection accelerator, have that easily dispersion, consumption be few, technological operation safely etc. Feature, has the effect of scorch-delaying, has taken into account scorch-delaying, has improved the characteristic of crosslink density and curingprocess rate faster, glue The curingprocess rate of material is slow, modulus is high, heat is low, and vulcanizate wearability is good, does not produce carcinogenic nitrosamine under curing temperature；With Acid accelerator M and with produce synergism, its activity significantly improves, and has both shortened sulfurizing time, when in turn ensure that incipient scorch Between, also improve the physical property of vulcanized rubber.

(16) anti-scorching agent CTP-80 can the most mixing and fine dispersion and distribution when mixing, it is ensured that CTP's is optimal Activity, as natural rubber and alkadienes elastomeric sulfuration antiscorching agent.

(17) peptizer DBD is the environmental protection peptizer of natural rubber, synthetic rubber or blend compounds.

The preparation method of aforesaid a kind of Low-rolling-resistantire tire tread rubber composition, comprises the following steps:

(1) guayule is prepared:

1. mechanical activation comminution.The guayule flush with ground that grown 21～24 months is cut off, removes disleaf and flower；By remaining stem Branch is cleaned, and after-4 DEG C of cold preservations 24 hours, mechanical activation comminution becomes the fritter of 3～5mm；

2. dilution is ground.Guayule stem branch fritter step 1. prepared adds the water of 10～15 times of solid weights to be carried out Grinding, form homogenate after milled plant tissue, the water of 3～5 times of its weight of homogenate after grinding dilutes；

3. filtering and impurity removing.Homogenate coarse filter step 2. prepared filters, and removes plant residue；

4. adjust PH glue existing.Homogenate pH value step 3. prepared with the sodium hydroxide solution that concentration is 20% is adjusted to 10, quiet Put 1h, prepare rubber particle suspension；

5. it is centrifuged and anhydrates.Rubber particle suspension step 4. prepared, uses high speed centrifuge method to anhydrate, prepares rubber Microgranule；

The most mixing drying.Rubber particle step 5. prepared and anti-aging agent RD are mixing according to the mass ratio of 1: 0.005 Uniformly, wide 30cm, the rubber sheet of thick 1cm are prepared；Rubber sheet is placed in 60 DEG C of drying rooms 9h, prepares guayule.

(2) mixer mixing

Calendering process is first carried out in banbury, rotor speed of banbury mixer 55rpm, and on banbury, blast 0.75MPa is fastened on top, Cooling water of banbury mixer temperature 25～35 DEG C；

The most once pressure is fastened: add natural rubber STR20, solution polymerized butadiene styrene rubber SSBR4525, neodymium series from feeder nose of banbury mixer Butadiene rubber BunaNd22EZ, guayule, pressure fastens 36s；

2. secondary pressure is fastened: mentions top on banbury and fastens, adds white carbon black ECORAX1670, white carbon from feeder nose of banbury mixer ULTRASIL 5000GR, silane coupler Si69, silane coupler KH580, White carbon black dispersant PEG4000, pressure fastens 48s, close Refining machine hose lining material temperature degree controls at 138～142 DEG C；

3. three pressures are fastened: mention top on banbury and fasten, add naphthenic oil NAP10, tackifying resin from feeder nose of banbury mixer Koresin, stearic acid 1801, ZnO-80, antioxidant A W, antioxidant 4020, peptizer DBD, pressure fastens 56s；

4. four pressures are fastened: mentioning top on banbury and fasten, then pressure fastens 20s, is compacted by glue stuff compounding in banbury, in discharging Portion's bubble；

5. binder removal: when banbury hose lining material temperature degree reaches 158 DEG C, opens banbury discharge gate, discharges banburying sizing material to opening On refining machine；

(3) mill mixing

Follow-up mixing carrying out on a mill until, banburying glue is discharged from banbury, after falling in mill, and blending 38s, make glue Material temperature degree is down to 89～99 DEG C；

1. 1/3 weight portion oil-filled type insoluble sulfur S, 1/3 weight portion accelerator TBSI, 1/3 weight portion accelerator are added M, blending 90s；

2. 1/3 weight portion oil-filled type insoluble sulfur S, 1/3 weight portion accelerator TBSI, 1/3 weight portion accelerator are added M, blending 90s；

3. 1/3 weight portion oil-filled type insoluble sulfur S, 1/3 weight portion accelerator TBSI, 1/3 weight portion accelerator are added M, adds anti-scorching agent CTP-80, blending 480s；

4. binder removal: sizing material is from mill fluctuating plate, and temperature controls at 80～85 DEG C；

(4), after the sizing material discharged from mill bottom sheet being cooled to room temperature, low rolling resistance tyre tread-rubber group is prepared Compound.

A kind of low rolling resistance tyre that aforesaid a kind of Low-rolling-resistantire tire tread rubber composition is made, at tyre surface Groove it is provided with and by the land portion of this groove zoning in portion；Fetus face includes: be arranged in tire equator is along wheel The narrow groove of longitudinal direction of the circumferentially continuous extension of tire, it is arranged in outside the two of tire equator and along a pair tire of the circumferentially continuous extension of tire Hat main line, it is arranged in the outside of a pair crown main line and along a pair shoulder main groove groove, comforter batt of the circumferentially continuous extension of tire It is preced with a pair tire crown land portion that main line clips, the centering clipped by crown main line and shoulder main groove groove with longitudinal narrow groove Between land portion and be positioned at a pair tire-shoulder land portion outside the tire axial of shoulder main groove groove；

Longitudinally narrow groove width is 3.0～3.5mm, and crown main line width is 5.0～5.5mm, shoulder main groove well width Being 5.0～5.5mm, crown main line width is identical with shoulder main groove well width；Longitudinally narrow groove, crown main line and tire shoulder master Three circumferential tap drains of groove, beneficially tire are run at high speed the anti-slippery become reconciled, and reduce resistance to rolling；

Tire crown land portion is along the circumferentially continuous extension of tire, and middle land portion and tire-shoulder land portion are respectively equipped with: along tire axle To extending and in the middle transverse groove of the circumferentially spaced setting of tire, tire-shoulder transverse groove；Middle transverse groove is connected with tire-shoulder transverse groove, laterally Groove to middle part transition, is improve drainage performance and the adhesive force in land portion of tire by shoulder, reduces tire rolling resistance Power；Middle transverse groove and tire-shoulder transverse groove be relative to tire peripheral, oblique extend a plurality of inclination traverse furrow, by the middle part of tyre surface to tire shoulder The cross groove of transition increases successively with the angle of centrage, is conducive to increasing the adhesive force of tire, improves drainage performance, fall Low tire drag；Middle transverse groove width is 4.0～4.5mm, and tire-shoulder transverse groove width is 5.0～7.0mm, tire-shoulder transverse groove width Gradually broaden outside tire axial；

Tire crown land portion is provided with the first siping, and the first siping and tire axial angle are 30 °；Middle land Portion is provided with the second siping, and the second siping and tire axial angle are 160 °；Tire-shoulder land portion is provided with the 3rd cutter Groove decorative pattern, the 3rd siping and tire axial angle are 10 °；

Longitudinally narrow groove, crown main line, shoulder main groove groove, tire crown land portion, middle land portion, tire-shoulder land portion, in Between traverse furrow, tire-shoulder transverse groove, the first siping, the second siping and the 3rd siping symmetrical along tire equator, quiet Sound comfortableness is good, and tire drag is little.

As preferably, longitudinally narrow groove is linear type ribs groove；Crown main line is near the side in tire crown land portion Cell wall is that zigzag extends along tire circumference alternate repetition, and jagged first re-entrant angle is 75 °, and crown main line is near middle land The side cell wall in ground portion has second re-entrant angle in the portion of each middle land, and the second re-entrant angle is 90 °；Shoulder main groove groove is decorative pattern The ribs groove that ditch the most slightly staggers, longitudinally narrow groove, crown main line and three kinds of organic knots of decorative pattern groove of shoulder main groove groove Close, improve the earth-grasping force of tire, reduce tire drag.

Also including that tire wear identifies, tire wear mark is arranged on the tire earth terminal outside along tire axle, tire It is uniform that abrasion are designated tire circumference 10 decile, and tire earth terminal is arranged in tire-shoulder land portion.

The present invention has the beneficial effects that: the present invention provides a kind of Low-rolling-resistantire tire tread rubber composition and manufacture thereof Tire, in tread rubber composition, the interphase interaction of each effective raw material, the most mixing, is uniformly dispersed, improves tire material Viscoelasticity, effectively reduce tire drag；Use the tire manufactured by described Tire tread rubber composition, by improving Tread patterns designed, reduces tire drag.The present invention provides the tire of a kind of Tire tread rubber composition and manufacture thereof, By optimizing tyre surface formula, improving calendering process, improve tread contour, and make three organically combine, ensure tyre surface earth-grasping force, While the performance such as wearability and anti-slippery, reduce the purpose of tire drag.

(1) solution polymerized butadiene styrene rubber SSBR4525 is improving the wet-sliding resistant performance of tire, face, main line and ice in tread rubber While the earth-grasping force on road surface, reduce tire drag.

(2) solution polymerized butadiene styrene rubber SSBR4525, white carbon ULTRASIL 5000GR, silane coupler Si69 and KH580 tri- Person's reaction bonded can produce special viscoelastic body rubber, greatly reduces hysteresis loss, reduces resistance to rolling.

(3) neodymium series butadiene rubber BunaNd22EZ can speed up filler and the integration of rubber fast and reliable, strengthens between polymer Distribution mutually, improve filler dispersion in whole refinery compound, be the critical material of the high-performance tire producing low-rolling-resistance.

(4) white carbon black ECORAX1670 is the special white carbon black of low-rolling-resistance for tire tread, white carbon ULTRASIL 5000GR fills glue and has preferable wet-sliding resistant performance and relatively low resistance to rolling, white carbon black ECORAX1670 and white carbon ULTRASIL 5000GR use, can improve tyre surface physical property, while improving tire wet-sliding resistant performance, reduces tire Resistance to rolling.

(5) naphthenic oil NAP10 and natural rubber STR20, solution polymerized butadiene styrene rubber SSBR4525, neodymium series butadiene rubber BunaNd22EZ no-float, has the most resistance to ability subduing, dropping compression heat generation, can significantly reduce resistance to rolling.

(6) ZnO-80 is a kind of pre-dispersed extraordinary zinc oxide being applicable to rubber industry, it is easy to dispersion, reduces energy consumption, is Natural rubber and the vulcanizing activator of dience rubber, can optimize the tensile property of vulcanizate, durability energy and anti-wear performance, make It has relatively low resistance to rolling and heat.

(7) three circumferential tap drains of tire tread: linear type ribs, with the sawtooth pattern of re-entrant angle and groove The ribs design relatively slightly staggered, improves the earth-grasping force of tire, the anti-slippery that being conducive to runs at high speed becomes reconciled, and drops Low-rolling-resistance.

(8) tire tread cross groove by shoulder to middle part transition, and by the middle part of tyre surface to the horizontal flower of tire shoulder transition Groove increases successively with the angle of centrage, improves drainage performance and the adhesive force in land portion of tire, reduces tire rolling Dynamic resistance.

(9) tire tread pattern is symmetrical, and quiet comfortableness is good, and tire drag is little.

Accompanying drawing explanation

Fig. 1 is the partial structurtes schematic diagram of tire tread in the embodiment of the present invention；

Symbol description in figure:

1. longitudinal narrow groove；2. crown main line；3. shoulder main groove groove；4. tire crown land portion；Middle land portion；6. tire Shoulder land portion；7. middle transverse groove；8. tire-shoulder transverse groove；9A. the first siping；9B. the second siping；9C. the 3rd cutter groove flower Stricture of vagina；10. the first re-entrant angle；11. second re-entrant angles；12. tire wear marks；CL. tire equator；E. tire earth terminal；R. tire Rotation direction.

Detailed description of the invention

Below by specific embodiment, the invention will be further described, and following example are illustrative, is not limit Qualitatively, it is impossible to limit protection scope of the present invention with this.

Method used in the present invention if no special requirements, is the production method of routine；The reagent used, such as nothing Particular provisions, are the commercially available prod of routine.

Comparative example:

A kind of low rolling resistance tyre tread glue formula, comprises the raw material of following weight portion meter:

Styrene butadiene rubber sbr is 8, emulsion polymerized styrene butadiene rubber ESBR is 25, solution polymerized butadiene styrene rubber SSBR is 42, butadiene rubber BR is 25, white carbon black N234 be 30, high-dispersion white carbon black be 40, active dispersing agents PEG be 2.5, organosilicon compound TESPT be 3.2, ring Guarantor aromatic naphtha RAE is 8, zinc oxide is 3, stearic acid is 1.5, antioxidant 4020 is 2, anti-aging agent RD is 1, protection wax is 1, sulfur With accelerant CZ be 3.5, anti-scorching agent CTP be 0.15.

The preparation method of above-mentioned a kind of low rolling resistance tyre tread rubber, comprises the following steps:

(1) one section mixing

One section mixing is carried out in GK580E type banbury, and rotor speed is speed change, and ram pressure is 15～18MPa.

Calendering process is: rubber, activator, activation dispersant and age resistor etc. is added in banbury, presses ram 25s； Mention ram, white carbon black, white carbon are added in banbury, presses ram 30s；Mention ram, RAE is added in banbury, pressure pressure Stone roller 320s, melting temperature is maintained at 145 DEG C；When banbury hose lining material temperature degree reaches 150 DEG C, discharge one from banbury discharge gate Section glue stuff compounding.

(2) two-stage mixing

Two-stage mixing is carried out in GK255 type banbury, and rotor speed is 22r min^-1, ram pressure is 8～11MPa.

Calendering process is: one section of glue stuff compounding, sulfur, accelerator and antiscorching agent etc. is added in banbury, presses ram 45s；Mention ram, the most again ram 30s；When banbury hose lining material temperature degree reaches 105 DEG C, discharge from banbury discharge gate Two-stage mixing sizing material.

(3), after two-stage mixing sizing material being cooled to room temperature, low rolling resistance tyre tread rubber is prepared.

Embodiment:

A kind of Low-rolling-resistantire tire tread rubber composition recipe ingredient described in embodiment 1,2,3,4,5 and weight portion As in table 1:(table 1, each material content unit is: weight portion)

Table 1 Tire tread rubber composition raw material and weight

Recipe ingredient	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Embodiment 5
						Natural rubber STR20	50	55	60	65	70
Solution polymerized butadiene styrene rubber SSBR4525	20	25	20	30	0
						Neodymium series butadiene rubber BunaNd22EZ	20	15	20	0	20
Guayule	10	5	0	5	10
						White carbon black ECORAX1670	25	20	20	30	35
White carbon ULTRASIL 5000GR	30	35	35	25	20
						Silane coupler Si69	2.5	3	3	2	1.5
Silane coupler KH580	0.3	0.4	0.4	0.2	0.2
						White carbon black dispersant PEG4000	1	1.5	1.5	0.5	0.5
Naphthenic oil NAP10	7	6	6	5	5
						Tackifying resin Koresin	5	4	4	3	3
ZnO-80	7	6	6	5	5
						Stearic acid 1801	3	2.5	2	1.5	1
Oil-filled type insoluble sulfur S	2.5	2	2	1.5	1.5
						Accelerator TBSI	2	1.5	1.5	1	1
Captax	0.5	0.4	0.4	0.3	0.3
						Antioxidant A W	1.5	1	1	0.5	0.5
Antioxidant 4020	1.5	1	1	0.5	0.5
						Anti-scorching agent CTP-80	0.5	0.4	0.4	0.3	0.3
Peptizer DBD	0.5	0.4	0.4	0.3	0.3

A kind of Low-rolling-resistantire tire tread rubber composition described in above-described embodiment 1,2,3,4,5, natural rubber The STR20 place of production is Thailand；Solution polymerized butadiene styrene rubber SSBR4525, neodymium series butadiene rubber BunaNd22EZ are that Lanxess Corporation of Germany produces Product；White carbon black ECORAX1670, white carbon ULTRASIL 5000GR are Degussa Products；Silane coupler Si69, silane are even Connection agent KH580 is Nanjing dawn chemical products；White carbon black dispersant PEG4000, antioxidant A W are chemical plant, Sinopec Nanjing Product；Naphthenic oil NAP10 is Liaohe River petro-chemical corporation product；Tackifying resin Koresin is BASF Corp. of Germany's product；Stearic acid 1801 places of production are Malaysia；ZnO-80, oil-filled type insoluble sulfur S, accelerator TBSI, captax, antioxidant 4020, anti- Burnt agent CTP-80, peptizer DBD are Shandong Yanggu Huatai Chemical Industry Co., Ltd's product；Guayule resin is non-commercially available product Product, oneself is prepared.

The preparation method of a kind of Low-rolling-resistantire tire tread rubber composition described in above-described embodiment 1,2,3,4,5, Comprise the following steps:

(1) guayule is prepared:

2. dilution is ground.Guayule stem branch fritter step 1. prepared adds the water of 10 times of solid weights and grinds Mill, forms homogenate after milled plant tissue, the water of 5 times of its weight of homogenate after grinding dilutes；

(2) mixer mixing

(3) mill mixing

A kind of Low-rolling-resistantire tire tread rubber composition described in above-mentioned comparative example and embodiment 1,2,3,4,5, its Vulcanizate test data are as shown in table 2:

Table 2 Tire tread rubber composition vulcanizate test data

From table 2 it can be seen that compared with comparative example, the present invention has superior physical property, generally speaking, embodiment 3 For optimum.

Tyre industry it has been proved that the tread mix hysteresis loss factor (tan δ) when 60 DEG C is relevant with resistance to rolling, 60 DEG C time sizing material tan δ the lowest, the resistance to rolling of tire is the lowest.From table 2 it can be seen that embodiment 3 sizing material tan δ is minimum when 60 DEG C, Tire drag is the least, and embodiment 2 is taken second place.

The one that a kind of Low-rolling-resistantire tire tread rubber composition described in above-described embodiment 1,2,3,4,5 is made is low Rolling resistance tyre, the partial structurtes schematic diagram of tire tread as shown in Figure 1:

The direction that tire is installed is designated, and arrow R represents the rotation direction of tire, and CL represents that tire equator, E represent ground connection End.Groove it is provided with and by the land portion of this groove zoning on this fetus face；This fetus face includes: be arranged in tire equator (CL) on along the circumferentially continuous extension of tire the narrow groove of longitudinal direction (1), be arranged in outside the two of tire equator (CL) and edge A pair crown main line (2) of the circumferentially continuous extension of tire, it is arranged in the outside of a pair crown main line (2) and along tire circumference The a pair shoulder main groove groove (3) extended continuously, a pair tire crown land clipped by crown main line (2) and longitudinal narrow groove (1) Portion (4), a pair middle land portion (5) clipped by crown main line (2) and shoulder main groove groove (3) and be positioned at shoulder main groove A pair tire-shoulder land portion (6) outside the tire axial of groove (3).

Longitudinally narrow groove (1) width is 3.2mm, and crown main line (2) width is 5.3mm, and shoulder main groove groove (3) width is 5.3mm；Longitudinally narrow groove (1), crown main line (2) and (3) three circumferential tap drains of shoulder main groove groove, beneficially tire row at a high speed Sail the anti-slippery become reconciled, and reduce resistance to rolling.

Tire crown land portion (4) is along the circumferentially continuous extension of tire, and middle land portion (5) and tire-shoulder land portion (6) is respectively equipped with: Extend along tire axial and in the middle transverse groove (7) of the circumferentially spaced setting of tire, tire-shoulder transverse groove (8), transverse pattern road pavement Earth-grasping force good, wearability is excellent；Middle transverse groove (7) is connected with tire-shoulder transverse groove (8), cross groove by shoulder to middle part mistake Cross, improve drainage performance and the adhesive force in land portion of tire, reduce tire drag；Middle transverse groove (7) and tire shoulder Traverse furrow (8) be relative to tire peripheral, oblique extend a plurality of inclination traverse furrow, by the middle part of tyre surface to the transverse pattern of tire shoulder transition Ditch increases successively with the angle of centrage, is conducive to increasing the adhesive force of tire, improves drainage performance, reduces tire rolling resistance Power；Middle transverse groove (7) width is 4.2mm, and tire-shoulder transverse groove (8) is 5.0mm near the side width of shoulder main groove groove (3), tire shoulder Traverse furrow (8) width gradually broadens outside tire axial, and tire-shoulder transverse groove (8) is 7.0mm along the outermost width of tire axial.

Tire crown land portion (4) is provided with the first siping (9A), and the first siping (9A) with tire axial angle is 30°；Middle land portion (5) is provided with the second siping (9B), and the second siping (9B) and tire axial angle are 160 °； Tire-shoulder land portion (6) is provided with the 3rd siping (9C), and the 3rd siping (9C) and tire axial angle are 10 °, and first Siping (9A), the second siping (9B) and the 3rd siping (9C) are with tire axial at an angle, it is ensured that tire Earth-grasping force, shorten braking distance.

Longitudinally narrow groove (1), crown main line (2), shoulder main groove groove (3), tire crown land portion (4), middle land portion (5), tire-shoulder land portion (6), middle transverse groove (7), tire-shoulder transverse groove (8), the first siping (9A), the second siping (9B) and 3rd siping (9C) is symmetrical along tire equator (CL), and quiet comfortableness is good, and tire drag is little.

Longitudinally narrow groove (1) is linear type ribs groove；Crown main line (2) is near the side in tire crown land portion (4) Cell wall is that zigzag extends along tire circumference alternate repetition, and jagged first re-entrant angle (10) is 75 °, and crown main line (2) leans on In the middle of near, the side cell wall of land portion (5) has second re-entrant angle (11), the second re-entrant angle (11) on each middle land portion (5) It it is 90 °；Shoulder main groove groove (3) is the ribs groove that groove the most slightly staggers.Longitudinally narrow groove (1), crown main line (2) And (3) three kinds of decorative pattern grooves of shoulder main groove groove organically combine, improve the earth-grasping force of tire, reduce tire drag.

Also including that tire wear identifies (12), tire wear mark (12) is arranged on tire earth terminal (E) along tire axle Outside, tire wear mark (12) be that tire circumference 10 decile is uniform, tire earth terminal (E) is arranged on tire-shoulder land portion (6) On.

A kind of Low-rolling-resistantire tire tread rubber composition described in above-described embodiment 1,2,3,4,5 makes specification 175/70R13Q, the low rolling resistance tyre of partial structurtes schematic diagram such as Fig. 1 of tire tread, assembles 5J standard rim, for nothing Inner tube tyre, carries out end properties test.Through inspection, the high speed performance of embodiment 1,2,3,4,5 tire is all more than 160km/ H, endurance quality reaches more than 35.5h, beyond national standard requirement.

Tire drag is the energy loss of unit operating range, and tire drag coefficient is the rolling that newton represents The ratio of resistance and the loading of tire represented by newton, coefficient of rolling resistance is the least, and tire drag is the least.Embodiment 1, 2, the coefficient of rolling resistance of 3,4,5 tires is as shown in table 3:

Table 3 embodiment tire drag

From table 3 it can be seen that the coefficient of rolling resistance of embodiment 3 tire is minimum, resistance to rolling is the most minimum, and embodiment 2 is taken turns Parity it.

Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention. Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one The widest range caused.

Claims

1. a Low-rolling-resistantire tire tread rubber composition, it is characterised in that: comprise the raw material of following weight portion meter:

Natural rubber STR20 is 50～70, solution polymerized butadiene styrene rubber SSBR4525 is 0～30, neodymium series butadiene rubber BunaNd22EZ Be 0～20, guayule be 0～10, white carbon black ECORAX1670 be 20～35, white carbon ULTRASIL 5000GR be 20～35, silicon Alkane coupling agent Si69 is 1.5～3.0, silane coupler KH580 is 0.2～0.4, White carbon black dispersant PEG4000 be 0.5～ 1.5, naphthenic oil NAP10 be 5.0～7.0, tackifying resin Koresin be 3.0～5.0, ZnO-80 be 5.0～7.0, stearic acid 1801 be 1.0～3.0, oil-filled type insoluble sulfur S be 1.5～2.5, accelerator TBSI be 1.0～2.0, captax be 0.3 ～0.5, antioxidant A W be 0.5～1.5, antioxidant 4020 be 0.5～1.5, anti-scorching agent CTP-80 be 0.3～0.5, peptizer DBD is 0.3～0.5；

Described natural rubber STR20, solution polymerized butadiene styrene rubber SSBR4525, neodymium series butadiene rubber BunaNd22EZ, guayule resin Total number be 100 parts；

A kind of Low-rolling-resistantire tire tread rubber composition the most according to claim 1, it is characterised in that: comprise following The raw material of weight portion meter:

Natural rubber STR20 is 55～60, solution polymerized butadiene styrene rubber SSBR4525 is 20～25, neodymium series butadiene rubber BunaNd22EZ Be 15～20, guayule be 0～5, white carbon black ECORAX1670 be 20～25, white carbon ULTRASIL 5000GR be 30～35, silicon Alkane coupling agent Si69 is 2.5～3.0, silane coupler KH580 is 0.3～0.4, White carbon black dispersant PEG4000 is 1～1.5, Naphthenic oil NAP10 is 6.0～7.0, tackifying resin Koresin is 4.0～5.0, ZnO-80 is 6.0～7.0, stearic acid 1801 is 2.0～3.0, oil-filled type insoluble sulfur S be 2.0～2.5, accelerator TBSI be 1.5～2.0, captax be 0.4～0.5, Antioxidant A W is 1～1.5, antioxidant 4020 is 1～1.5, anti-scorching agent CTP-80 is 0.4～0.5, peptizer DBD be 0.4～ 0.5；

Described natural rubber STR20, solution polymerized butadiene styrene rubber SSBR4525, neodymium series butadiene rubber BunaNd22EZ, guayule rubber limb Total number be 100 parts；

Natural rubber STR20 is 55, solution polymerized butadiene styrene rubber SSBR4525 is 25, neodymium series butadiene rubber BunaNd22EZ is 15, silver Chrysanthemum glue is 5, white carbon black ECORAX1670 is 20, white carbon ULTRASIL 5000GR is 35, silane coupler Si69 is 3, silane even Connection agent KH580 is 0.4, White carbon black dispersant PEG4000 is 1.5, naphthenic oil NAP10 is 6, tackifying resin Koresin is 4, ZnO-80 is 6, stearic acid 1801 is 2.5, oil-filled type insoluble sulfur S is 2, accelerator TBSI is 1.5, captax is 0.4, Antioxidant A W is 1, antioxidant 4020 is 1, anti-scorching agent CTP-80 is 0.4, peptizer DBD is 0.4；

Natural rubber STR20 is 60, solution polymerized butadiene styrene rubber SSBR4525 is 20, neodymium series butadiene rubber BunaNd22EZ is 20, silver Chrysanthemum glue is 0, white carbon black ECORAX1670 is 20, white carbon ULTRASIL 5000GR is 35, silane coupler Si69 is 3, silane even Connection agent KH580 is 0.4, White carbon black dispersant PEG4000 is 1.5, naphthenic oil NAP10 is 6, tackifying resin Koresin is 4, ZnO-80 is 6, stearic acid 1801 is 2, oil-filled type insoluble sulfur S is 2, accelerator TBSI is 1.5, captax is 0.4, prevents Old agent AW is 1, antioxidant 4020 is 1, anti-scorching agent CTP-80 is 0.4, peptizer DBD is 0.4；

5. according to the preparation method of a kind of Low-rolling-resistantire tire tread rubber composition described in claim 1 or 2 or 3 or 4, It is characterized in that: comprise the following steps:

(1) guayule is prepared:

1. mechanical activation comminution: the guayule flush with ground that grown 21～24 months is cut off, removes disleaf and flower；Remaining stem branch is washed Only, after-4 DEG C of cold preservations 24 hours, mechanical activation comminution becomes the fritter of 3～5mm；

2. dilution is ground: guayule stem branch fritter step 1. prepared adds the water of 10～15 times of solid weights and grinds Mill, forms homogenate after milled plant tissue, the water of 3～5 times of its weight of homogenate after grinding dilutes；

3. filtering and impurity removing: homogenate coarse filter step 2. prepared filters, removes plant residue；

4. adjust PH glue existing: homogenate pH value step 3. prepared with the sodium hydroxide solution that concentration is 20% is adjusted to 10, stands 1h, Prepare rubber particle suspension；

5. it is centrifuged and anhydrates: the rubber particle suspension that 4. step is prepared, use high speed centrifuge method to anhydrate, prepare rubber micro- Grain；

The most mixing drying: rubber particle step 5. prepared and anti-aging agent RD are mixing uniformly according to the mass ratio of 1: 0.005, Prepare wide 30cm, the rubber sheet of thick 1cm；Rubber sheet is placed in 60 DEG C of drying rooms 9h, prepares guayule；

(2) mixer mixing

Calendering process is first carried out in banbury, rotor speed of banbury mixer 55rpm, and on banbury, blast 0.75MPa, banburying are fastened in top Machine cooling water temperature 25～35 DEG C；

The most once pressure is fastened: add natural rubber STR20, solution polymerized butadiene styrene rubber SSBR4525, neodymium series along fourth from feeder nose of banbury mixer Rubber BunaNd22EZ, guayule, pressure fastens 36s；

4. four pressures are fastened: mentioning top on banbury and fasten, then pressure fastens 20s, is compacted by glue stuff compounding in banbury, discharges internal gas Bubble；

5. binder removal: when banbury hose lining material temperature degree reaches 158 DEG C, opens banbury discharge gate, discharges banburying sizing material to mill On；

(3) mill mixing

Follow-up mixing carrying out on a mill until, banburying glue is discharged from banbury, after falling in mill, and blending 38s, make sizing material temperature Degree is down to 89～99 DEG C；

1. add 1/3 weight portion oil-filled type insoluble sulfur S, 1/3 weight portion accelerator TBSI, 1/3 weight portion captax, smash Glue 90s；

2. add 1/3 weight portion oil-filled type insoluble sulfur S, 1/3 weight portion accelerator TBSI, 1/3 weight portion captax, smash Glue 90s；

3. 1/3 weight portion oil-filled type insoluble sulfur S, 1/3 weight portion accelerator TBSI, 1/3 weight portion captax are added, then Add anti-scorching agent CTP-80, blending 480s；

(4), after the sizing material discharged from mill bottom sheet being cooled to room temperature, Low-rolling-resistantire tire tread rubber composition is prepared.

6. the one made according to a kind of Low-rolling-resistantire tire tread rubber composition described in claim 1 or 2 or 3 or 4 Low rolling resistance tyre, is provided with groove and by the land portion of this groove zoning on fetus face；Described fetus face includes: join Put one in tire equator (CL) the narrow groove of the longitudinal direction (1) along the circumferentially continuous extension of tire, be arranged in tire equator (CL) Two outside and along the circumferentially continuous extension of tire a pair crown main line (2), be arranged in crown main line (2) described in a pair Outside and along a pair shoulder main groove groove (3) of the circumferentially continuous extension of tire, by described crown main line (2) and the narrow ditch of described longitudinal direction A pair tire crown land portion (4) that groove (1) clips, a pair clipped by described crown main line (2) and described shoulder main groove groove (3) Middle land portion (5) and be positioned at a pair tire-shoulder land portion (6) outside the tire axial of described shoulder main groove groove (3), it is special Levy and be:

Described longitudinal direction narrow groove (1) width is 3.0～3.5mm, and described crown main line (2) width is 5.0～5.5mm, described Shoulder main groove groove (3) width is 5.0～5.5mm, described crown main line (2) width and described shoulder main groove groove (3) width phase With；

Described tire crown land portion (4) is along the circumferentially continuous extension of tire, described middle land portion (5) and described tire-shoulder land portion (6) It is respectively equipped with: extend along tire axial and in the middle transverse groove (7) of the circumferentially spaced setting of tire, tire-shoulder transverse groove (8)；In described Between traverse furrow (7) be connected with described tire-shoulder transverse groove (8), described middle transverse groove (7) and described tire-shoulder transverse groove (8) are relative to tire The a plurality of inclination traverse furrow that peripheral, oblique extends；Described middle transverse groove (7) width is 4.0～4.5mm, and described tire-shoulder transverse groove (8) is wide Degree is 5.0～7.0mm, and described tire-shoulder transverse groove (8) width gradually broadens outside tire axial；

Described tire crown land portion (4) is provided with the first siping (9A), and described first siping (9A) is pressed from both sides with tire axial Angle is 30 °；Described middle land portion (5) is provided with the second siping (9B), described second siping (9B) and tire axle It it is 160 ° to angle；Described tire-shoulder land portion (6) is provided with the 3rd siping (9C), described 3rd siping (9C) and wheel The axial angle of tire is 10 °；

The narrow groove of described longitudinal direction (1), crown main line (2), shoulder main groove groove (3), tire crown land portion (4), middle land portion (5), tire-shoulder land portion (6), middle transverse groove (7), tire-shoulder transverse groove (8), the first siping (9A), the second siping (9B) and 3rd siping (9C) is symmetrical along described tire equator (CL).

A kind of low rolling resistance tyre the most according to claim 6, it is characterised in that: the narrow groove of described longitudinal direction (1) is straight Line style ribs groove；Described crown main line (2) is that zigzag is along tire near the side cell wall of described tire crown land portion (4) Circumference alternate repetition extends, and described jagged first re-entrant angle (10) is 75 °, and described crown main line (2) is near described centre The side cell wall in land portion (5) has second re-entrant angle (11), described second re-entrant angle on each described middle land portion (5) (11) it is 90 °；Shoulder main groove groove (3) is the ribs groove that groove the most slightly staggers.

A kind of low rolling resistance tyre the most according to claim 6, it is characterised in that: also include that tire wear identifies (12), described tire wear mark (12) is arranged on the tire earth terminal (E) outside along tire axle, and described tire wear identifies (12) being that tire circumference 10 decile is uniform, described tire earth terminal (E) is arranged on described tire-shoulder land portion (6).