CN105440333A - Cobalt salt-free tire steel wire framework material formula and preparation method thereof - Google Patents
Cobalt salt-free tire steel wire framework material formula and preparation method thereof Download PDFInfo
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- CN105440333A CN105440333A CN201510896112.4A CN201510896112A CN105440333A CN 105440333 A CN105440333 A CN 105440333A CN 201510896112 A CN201510896112 A CN 201510896112A CN 105440333 A CN105440333 A CN 105440333A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0041—Compositions of the carcass layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C2001/0066—Compositions of the belt layers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a cobalt salt-free tire steel wire framework material formula. The formula comprises, by weight, 80-100 parts of natural rubber, 0-20 parts of polyisoprene rubber, 50-65 parts of carbon black, 0.5-3 parts of anti-aging agent, 0-1 part of stearic acid, 0-1 part of p-hydroxybenzoic acid, 6-10 parts of zinc oxide, 1-3 parts of resorcinol or bonding resin, 5-9 parts of insoluble sulfur, 0.5-1.5 parts of accelerant, 0-5 parts of binding agent and 0.1-0.3 part of antiscorching agent. According to the material formula, cobalt salt is not used, and the hardness and fixed elongation of rubber materials are made to reach an original level by adjusting a vulcanization system. Good bonding strength can be achieved between the rubber materials and a steel wire containing a cobalt coating, the aging-resistant performance of the rubber materials is increased by 9.2%-19.2%, and the bonding strength retention rate is increased by 4%-15% after aging; meanwhile, the formula cost can be reduced by 1%-3%, and environmental pollution is reduced.
Description
Technical field
The invention belongs to tire manufacturing techniques field, be specifically related to a kind of steel-wire carcass material prescription without cobalt salt and preparation method thereof.
Background technology
Body piles and belt are the important feature in tire, and wherein the bonding of sizing material and steel cord is the main performance index of body piles and belt.Because cobalt salt can promote the bonding of rubber and brass-plated steel wire, sizing material and Coppered Steel Wire bond properties can be significantly improved, therefore the general cobalt salt that uses of the formula of framework material bonding is at present as adhesionpromoter.The adhesion mechanism of cobalt salt is as follows: it has been generally acknowledged that no matter which kind of organic cobalt product, and working what promote adhesive effect is all cobalt ion.Sizing material containing cobalt salt is before sulfuration, just exist between sizing material with brass coating steel cord and simply contact, and in sulfidation, just new material layer is defined between rubber and brass-plating, particularly define metallic sulfide layer, i.e. immeasurable cuprous sulfide layer CuxS and zinc sulfide layer ZnS; Cuprous sulfide CuxS is wherein only had to be only real glued construction layer.Because only have cuprous sulfide CuxS just to have the activity continuing reaction, it can be spread to interfacial layer and the chemical bonding generating cuprous sulfide-vulcanization of rubber thing Cux-S-Sy-Rub form by sulphur bridge and vulcanization of rubber thing Rub-Sx, namely creates rubber and brass coating conglutination reaction.
Under curing temperature, conglutination reaction and vulcanization reaction must be worked in coordination with and be carried out, and its reaction mechanism is as follows:
Cobalt atom or carboxyl structure is not had in rubber and brass coating adhesive bond.Divalent cobalt ion in organic cobalt salt just plays a driving role to the generation of active cuprous sulfide, and namely organic cobalt salt promotes the effect of bonding.
For rubber and brass coating bond key be control sulfuration with bonding two synergies of reacting.The reaction generating CuxS due to copper and sulphur is slower than the reaction of rubber and sulphur, and cobalt salt can promote the generation of CuxS, thus in natural rubber, add a small amount of cobalt salt, can improve the initial adhesion performance with Coppered Steel Wire.But the membership that adds of cobalt salt causes sizing material aging resistance poor, level of adhesion can with over cure and aging and sharply decline, and this decline is relevant with cobalt salt consumption in sizing material, and cobalt salt consumption is more, and sizing material aging resistance is poorer.
Along with the development of coating of steel wire cord technology, can realize at present by cobalt ion Direct Electroplating in coating of steel wire cord, such as shellfish Hans Kalt TAWI product, the appearance of this series products is that exploitation does not provide possibility containing the tyre wire framework material of cobalt salt.
Summary of the invention
For the problems referred to above, the present invention aims to provide a kind of not containing the tyre wire framework material formula of cobalt salt, on the basis ensureing sizing material and steel cord bounding force, improves sizing material ageing-resistant performance, reduces formulation cost.
A kind of tyre wire framework material without cobalt salt is filled a prescription, and comprises the component of following weight part: natural rubber 80-100 part, polyisoprene rubber (IR) 0-20 part, carbon black 50-65 part, anti-aging agent 0.5-3 part, stearic acid 0-1 part, P-hydroxybenzoic acid 0-1 part, zinc oxide 6-10 part, Resorcinol or binder resin 1-3 part, insoluble sulfur 5-9 part, promotor 0.5-1.5 part, tackiness agent 0-5 part, scorch retarder 0.1-0.3 part.
Preferably, the tyre wire framework material without cobalt salt is filled a prescription, and comprises the component of following weight part: natural rubber 85-95 part, polyisoprene rubber (IR) 5-15 part, carbon black 58-65 part, anti-aging agent 2-3 part, stearic acid 1 part, P-hydroxybenzoic acid 1 part, zinc oxide 8-10 part, Resorcinol or binder resin 2 parts, insoluble sulfur 5-8 part, promotor 0.7-1.4 part, 3 parts, tackiness agent, scorch retarder 0.2-0.3 part.
Preferably, the component of TBR (all-steel load-bearing radial tire) body piles is: natural rubber 85-95 part, polyisoprene rubber 5-15 part, carbon black 58 parts, 2 parts, anti-aging agent, 8 parts, zinc oxide, binder resin 2.0 parts, insoluble sulfur 5 parts, promotor 1.3 parts, 3 parts, tackiness agent, scorch retarder 0.2 part.
Preferably, the component of TBR (all-steel load-bearing radial tire) belt is: natural rubber 85-95 part, polyisoprene rubber 5-15 part, carbon black 65 parts, 3 parts, anti-aging agent, 9 parts, zinc oxide, binder resin 2.0 parts, insoluble sulfur 5.5 parts, promotor 1.4 parts, 3 parts, tackiness agent, scorch retarder 0.2 part.
Preferably, the component of PCR (passenger car radial) belt is: natural rubber 85-95 part, polyisoprene rubber 5-15 part, carbon black 60 parts, 2 parts, anti-aging agent, 10 parts, zinc oxide, stearic acid 1 part, P-hydroxybenzoic acid 1 part, binder resin 2 parts, insoluble sulfur 8 parts, promotor 0.7 part, scorch retarder 0.3 part.
Described natural rubber is one or more in 3# smoke sheet rubber, 20# natural gum, 10# natural gum.
Described carbon black is one or more in N326, N330, N375.
Described anti-aging agent is one or more in antioxidant 4020, anti-aging agent RD, antioxidant D TPD.
Described zinc oxide is one or more in indirect process zinc oxide, active zinc flower, nano zine oxide.
Described stearic acid is one or more in SA1801,800T, R40,200P, SA1840.
Described Resorcinol or binder resin be in Resorcinol, modification resorcinol formaldehyde resin, Cresol Formaldehyde Resin one or more.
Described insoluble sulfur is one or more in OT2O series.
Described promotor is one or more in accelerator DZ, NS.
Described tackiness agent is one or more in HMMM, HMT.
Described scorch retarder is PVI.
The compounding process of above-mentioned sizing material, comprises the following steps:
(1) one section mixing: regulate Banbury mixer rotating speed 45-55rpm, ram piston pressure 0.4-0.6MPa, adds natural rubber, polyisoprene rubber is mixing, pressure floating weight 15-30s, carry stone roller, add whole anti-aging agent, zinc oxide, stearic acid, P-hydroxybenzoic acid, Resorcinol or binder resin, add the carbon black of 70%-80%, pressure floating weight 25-35s, carry stone roller, pressure floating weight mixing 25-35s, 160-175 DEG C binder removal, obtains one section of master batch;
(2) two-stage mixing: regulate Banbury mixer rotating speed 45-55rpm, ram piston pressure 0.4-0.6MPa, adds one section of master batch, residue carbon black, and pressure floating weight 25-35s, carries stone roller, and pressure floating weight mixing 25-35s, 150-165 DEG C binder removal, obtains two sections of master batchs;
(3) three-stage mixing: regulate Banbury mixer rotating speed 40-50rpm, ram piston pressure 0.4-0.6MPa, adds two sections of master batchs, pressure floating weight 20-30s, carries stone roller, and pressure floating weight mixing 20-30s, 145-160 DEG C binder removal, obtains three sections of master batchs;
(4) finished composition is mixing: regulate Banbury mixer rotating speed 18-28rpm, ram piston pressure 0.4-0.6MPa, adds three sections of master batchs, insoluble sulfur, promotor, scorch retarder, tackiness agent, pressure floating weight 20-30s, carries stone roller, pressure floating weight 20-30s, carry stone roller, pressure floating weight 20-30s, 100-105 DEG C of binder removal, obtains finished composition, finished composition, by mill compressing tablet, cools, builds buttress.
Described material manufacture tyre wire skeleton time, need with cobalt coated steel cord with the use of.
It is as follows that material prescription of the present invention and cobalt coated steel cord bond principle:
In prior art, steel wire bounding force is in weathering process, and especially in steam aging, because dezincify causes the divalent zinc thickness formed at adhesive surface to increase, thus bounding force is declined, formula is containing cobalt salt simultaneously, also can accelerated deterioration process under thermal ageing.The present invention uses cobalt coated steel cord, and cobalt ion is plated in Steel Wire Surface, can play the effect of cobalt salt in sizing compound formula, but compares original two-phase gold plate (i.e. brass coating) → zinc-copper, becomes three-phase gold plate → zinc-copper-cobalt.Containing a small amount of cobalt ion in three-phase gold plate, dezincify can be slowed down to a great extent, suppress the corrosion of brass under hygrothermal environment, keep higher bounding force, can cobalt salt be cancelled in formula simultaneously, reduce sizing material catabiosis.
Material prescription of the present invention eliminates the use of cobalt salt, can reduce formulation cost 1%-3% on the one hand.Also greatly reduce the pollution of cobalt to environment on the other hand, avoid the pollution to air, water body and soil in production process.In addition, want to reach same bounding force, add cobalt higher than consumption in steel cord in framework material, the cobalt consumption therefore for unit tire also reduces, and thus all can reduce from its production cost of angle of whole industrial chain and pollution level.
While cancellation cobalt salt, by the adjustment to vulcanization system, make its sizing material hardness, surely stretch and reach original level.This formulated rubber material can produce good bond strength with the steel wire containing cobalt coating, improves ageing-resistant performance (ageing-resistant performance improves 9.2%-19.2%) and the aging rear bond strength conservation rate (bond strength conservation rate improves 4%-15%) of sizing material.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further details.
Embodiment 1
TBR (all-steel load-bearing radial tire) body piles formula is as shown in table 1:
Table 1TBR body piles formula
Synergist S-421 95 | Embodiment 1 | Comparative example 1 |
3# smoke sheet rubber | 85.00 | 85.00 |
IR | 15.00 | 15.00 |
Carbon black N326 | 58.00 | 58.00 |
Indirect process zinc oxide | 8.00 | 8.00 |
Antioxidant 4020 | 1.50 | 1.50 |
Anti-aging agent RD | 0.50 | 0.50 |
Modification resorcinol formaldehyde resin | 2.00 | 2.00 |
New cobalt decanoate (20.5%) | 0.80 | |
Insoluble sulfur HD0T20 | 5.00 | 5.00 |
Accelerator DZ | 0.70 | 1.30 |
Accelerator NS | 0.60 | |
Tackiness agent HMMM | 3.00 | 3.00 |
Scorch retarder PVI | 0.20 | 0.20 |
Add up to | 179.50 | 180.30 |
Embodiment 2
TBR (all-steel load-bearing radial tire) belt formula is as shown in table 2:
Table 2TBR belt formula
Embodiment 3
PCR (passenger car radial) belt formula is as shown in table 3:
Table 3PCR belt formula
Synergist S-421 95 | Embodiment 3 | Comparative example 3 |
3# smoke sheet rubber | 85.00 | 85.00 |
IR | 15.00 | 15.00 |
Carbon black N326 | 60.00 | 60.00 |
Indirect process zinc oxide | 10.00 | 10.00 |
Stearic acid SA1840 | 1.00 | 0.50 |
Antioxidant 4020 | 1.00 | 1.00 |
Anti-aging agent RD | 1.00 | 1.00 |
Cobalt boracylate (22.5%) | 1.00 | |
P-hydroxybenzoic acid | 1.00 | 1.00 |
Cresol Formaldehyde Resin | 2.00 | 2.00 |
Insoluble sulfur HD0T20 | 8.00 | 7.50 |
Accelerator DZ | 0.70 | 0.50 |
Scorch retarder PVI | 0.30 | 0.45 |
Add up to | 185.00 | 184.95 |
Above-described embodiment 1-3 and comparative example all adopt following compounding process:
(1) one section is mixing:
Mixingly to carry out in BB430 Banbury mixer.Adjusting rotary speed 50rpm, ram piston pressure 0.6MPa, add natural rubber, polyisoprene rubber, pressure floating weight 30s, carries stone roller, add whole anti-aging agent, zinc oxide, stearic acid, P-hydroxybenzoic acid, Resorcinol or binder resin, add the carbon black pressure floating weight 30s of 70%-80%, carry stone roller, the mixing 30s of pressure floating weight, 165 DEG C of binder removals, obtain one section of master batch;
After master batch Banbury mixer binder removal, sizing material by forcing machine compressing tablet, behind separant pond cool, build buttress.
(2) two-stage mixing:
Mixingly to carry out in BB430 Banbury mixer.Adjusting rotary speed 45rpm, ram piston pressure 0.6MPa, add one section of master batch, residue carbon black, and pressure floating weight 30s, carries stone roller, the mixing 30s of pressure floating weight, and 160 DEG C of binder removals, obtain two sections of master batchs;
After master batch Banbury mixer binder removal, sizing material by forcing machine compressing tablet, behind separant pond cool, build buttress.
(3) three-stage mixing:
Mixingly to carry out in BB430 Banbury mixer.Adjusting rotary speed 45rpm, ram piston pressure 0.6MPa, add two sections of master batchs, and pressure floating weight 30s, carries stone roller, the mixing 30s of pressure floating weight, and 155 DEG C of binder removals, obtain three sections of master batchs;
After master batch Banbury mixer binder removal, sizing material by forcing machine compressing tablet, behind separant pond cool, build buttress.
(4) finished composition is mixing
Mixingly to carry out in GK255 Banbury mixer.Adjusting rotary speed 25rpm, ram piston pressure 0.5MPa, add three sections of master batchs, insoluble sulfur, promotor, scorch retarder, tackiness agent, and pressure floating weight 25s, carries stone roller, and pressure floating weight 25s, carries stone roller, and pressure floating weight 20s, 103 DEG C of binder removals, obtain finished composition.
After finished composition Banbury mixer binder removal, sizing material by each 3 times of mill compressing tablet, on a mill until left and right cutting knife, behind separant pond cool, build buttress.
Embodiment 1-3 and comparative example obtain the performance comparison of sizing material as shown in Table 4-6:
Table 4 embodiment 1 and comparative example 1 obtain the performance comparison of sizing material
Test sizing contrasts normal sizing material, tensile strength, the tensile yield of sizing material, surely stretch, hardness and tear resistance be substantially in same level; Test sizing resilience improves, and sizing material heat-dissipating (60 DEG C of Tan δ) reduces; Test sizing mooney scorch and sulphur become instrument data and normal sizing material in same level; Test sizing ageing-resistant performance is good, ageing-resistant coefficient improves 2.64% (ageing-resistant performance improves 18.6%), the aging front bounding force of test sizing and normal sizing material difference are little, but aging rear bounding force is better than normal sizing material, and the aging rear bounding force conservation rate of test sizing improves 4%-9%.
Table 5 embodiment 2 and comparative example 2 obtain the performance comparison of sizing material
Test sizing contrasts normal sizing material, tensile strength, the tensile yield of sizing material, surely stretch, hardness and tear resistance be substantially in same level; Test sizing resilience improves, and sizing material heat-dissipating (60 DEG C of Tan δ) reduces; Test sizing mooney scorch and sulphur become instrument data and normal sizing material in same level; Test sizing ageing-resistant performance is good, ageing-resistant coefficient improves 1.53% (ageing-resistant performance improves 9.2%), the aging front bounding force of test sizing and normal sizing material difference little, but aging rear bounding force quite or be better than normal sizing material, the aging rear bounding force conservation rate of test sizing improves 6%-11%.
Table 6 embodiment 3 and comparative example 3 obtain the performance comparison of sizing material
Test sizing contrasts normal sizing material, tensile strength, the tensile yield of sizing material, surely stretch, hardness and tear resistance be substantially in same level; Sizing material heat-dissipating (60 DEG C of Tan δ) slightly improves; Test sizing mooney scorch and sulphur become instrument data and normal sizing material in same level; Test sizing ageing-resistant performance is good, ageing-resistant coefficient improves 1.37% (ageing-resistant performance improves 19.2%), the aging front bounding force of test sizing and normal sizing material difference little, but aging rear bounding force quite or be better than normal sizing material, the aging rear bounding force conservation rate of test sizing improves 6%-15%.
Claims (10)
1. the tyre wire framework material without cobalt salt is filled a prescription, and it is characterized in that, comprises the component of following weight part: natural rubber 80-100 part, polyisoprene rubber 0-20 part, carbon black 50-65 part, anti-aging agent 0.5-3 part, stearic acid 0-1 part, P-hydroxybenzoic acid 0-1 part, zinc oxide 6-10 part, Resorcinol or binder resin 1-3 part, insoluble sulfur 5-9 part, promotor 0.5-1.5 part, tackiness agent 0-5 part, scorch retarder 0.1-0.3 part.
2. the tyre wire framework material without cobalt salt according to claim 1 is filled a prescription, and it is characterized in that, comprises the component of following weight part: natural rubber 85-95 part, polyisoprene rubber 5-15 part, carbon black 58-65 part, anti-aging agent 2-3 part, stearic acid 1 part, P-hydroxybenzoic acid 1 part, zinc oxide 8-10 part, Resorcinol or binder resin 2 parts, insoluble sulfur 5-8 part, promotor 0.7-1.4 part, 3 parts, tackiness agent, scorch retarder 0.2-0.3 part.
3. the tyre wire framework material without cobalt salt according to claim 1 is filled a prescription, it is characterized in that, the component of TBR body piles is: natural rubber 85 parts, polyisoprene rubber 15 parts, carbon black 58 parts, 2 parts, anti-aging agent, 8 parts, zinc oxide, binder resin 2.0 parts, insoluble sulfur 5 parts, promotor 1.3 parts, 3 parts, tackiness agent, scorch retarder 0.2 part.
4. the tyre wire framework material without cobalt salt according to claim 1 is filled a prescription, it is characterized in that, the component of TBR belt is: natural rubber 90 parts, polyisoprene rubber 10 parts, carbon black 65 parts, 3 parts, anti-aging agent, 9 parts, zinc oxide, binder resin 2.0 parts, insoluble sulfur 5.5 parts, promotor 1.4 parts, 3 parts, tackiness agent, scorch retarder 0.2 part.
5. the tyre wire framework material without cobalt salt according to claim 1 is filled a prescription, and it is characterized in that, the component of PCR belt is: natural rubber 80 parts, polyisoprene rubber 20 parts, carbon black 60 parts, 2 parts, anti-aging agent, 10 parts, zinc oxide, stearic acid 1 part, P-hydroxybenzoic acid 1 part, binder resin 2 parts, insoluble sulfur 8 parts, promotor 0.7 part, scorch retarder 0.3 part.
6. fill a prescription according to the arbitrary described tyre wire framework material without cobalt salt of claim 1-5, it is characterized in that, described natural rubber is one or more in 3# smoke sheet rubber, 20# natural gum, 10# natural gum; Described carbon black is one or more in N326, N330, N375; Described anti-aging agent is one or more in antioxidant 4020, anti-aging agent RD, antioxidant D TPD.
7. fill a prescription according to the arbitrary described tyre wire framework material without cobalt salt of claim 1-5, it is characterized in that, described zinc oxide is one or more in indirect process zinc oxide, active zinc flower, nano zine oxide; Described stearic acid is one or more in SA1801,800T, R40,200P, SA1840.
8. fill a prescription according to the arbitrary described tyre wire framework material without cobalt salt of claim 1-5, it is characterized in that, described Resorcinol or binder resin be in Resorcinol, modification resorcinol formaldehyde resin, Cresol Formaldehyde Resin one or more; Described insoluble sulfur is one or more in OT2O series.
9. fill a prescription according to the arbitrary described tyre wire framework material without cobalt salt of claim 1-5, it is characterized in that, described promotor is one or more in accelerator DZ, NS; Described tackiness agent is one or more in HMMM, HMT; Described scorch retarder is PVI.
10., according to the compounding process that the arbitrary described tyre wire framework material without cobalt salt of claim 1-9 is filled a prescription, comprise the following steps:
(1) one section mixing: regulate Banbury mixer rotating speed 45-55rpm, ram piston pressure 0.4-0.6MPa, adds natural rubber and polyisoprene rubber is mixing, pressure floating weight 15-30s, carry stone roller, add whole anti-aging agent, zinc oxide, stearic acid, P-hydroxybenzoic acid, Resorcinol or binder resin, add the carbon black of 70%-80%, pressure floating weight 25-35s, carry stone roller, pressure floating weight mixing 25-35s, 160-175 DEG C binder removal, obtains one section of master batch;
(2) two-stage mixing: regulate Banbury mixer rotating speed 45-55rpm, ram piston pressure 0.4-0.6MPa, adds one section of master batch, residue carbon black, and pressure floating weight 25-35s, carries stone roller, and pressure floating weight mixing 25-35s, 150-165 DEG C binder removal, obtains two sections of master batchs;
(3) three-stage mixing: regulate Banbury mixer rotating speed 40-50rpm, ram piston pressure 0.4-0.6MPa, adds two sections of master batchs, pressure floating weight 20-30s, carries stone roller, and pressure floating weight mixing 20-30s, 145-160 DEG C binder removal, obtains three sections of master batchs;
(4) finished composition is mixing: regulate Banbury mixer rotating speed 18-28rpm, ram piston pressure 0.4-0.6MPa, adds three sections of master batchs, insoluble sulfur, promotor, scorch retarder, tackiness agent, pressure floating weight 20-30s, carries stone roller, pressure floating weight 20-30s, carry stone roller, pressure floating weight 20-30s, 100-105 DEG C of binder removal, obtains finished composition, finished composition, by mill compressing tablet, cools, builds buttress.
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