Soft, high antifatigue extractable flame-proof armored rope core conveyer belt core glue and preparation method thereof
Technical field
The present invention relates to a kind of soft, high antifatigue extractable fire retarding conveying band Steel cord glue take chloroprene rubber as the main body sizing material and preparation method thereof, adopt the conveying belt of this core glue preparation to support the use with all kinds of large conveying quantities, long belt conveyor, be mainly used in the industries such as coal mining.
Background technology
Steel cable core conveying belt be the high-performance galvanized wire rope arranged take vertical determining deviation, equal tension as framework material, the core glue, rubber cover that covers different performance, different thickness outside up and down and both sides through moulding, vulcanize and form.Steel cable core conveying belt has the advantages such as intensity is high, elongation is low, groove forming character good, joint is reliable, and safety performance (comprising fire-retardant and antistatic property) is well more a lot of than fabric core conveyor belt, can realize the economy transportation under large traffic capacity, extra long distance and unfavorable terrain condition, thereby be widely used.
Steel cable core conveying belt divides by purposes, except coventional type, and fire-retardant, cold-resistant, anti-ozone, the type such as heat-resisting in addition.The binding property of steel core conveyor belt and flame retardant properties are very important for its use, and its chief component is except the high-quality galvanized wire rope, and the main raw material of its adhesive glue and rubber cover consists of: NR (natural rubber), SBR (styrene-butadiene rubber(SBR)), CR322 (chloroprene rubber), zinc oxide, sulphur, clorafin 70, decabromodiphynly oxide, weisspiessglanz, aluminium hydroxide, zinc borate, magnesium oxide and fire retardant MB-202 and anti-aging agent, tackiness agent, promotor etc.
Because the core glue modular ratio wireline of conveying belt is much lower, in the situation that be subject to same power, core glue deformation ratio wireline is much larger, so steel cable core conveying belt use and the delivery process in, because of the one of the main reasons that is the conveying belt fatigure failure of the inconsistent fatigure failure that causes of distortion between core glue and wireline.GB is the examination criteria of the tired extraction performance of the steel wire of steel cable core conveying belt as steel cable core conveying belt, so in the process of from now on conveyer belt structure and formulating of recipe, we should pay attention to the tired extraction performance of wireline more.
If reduce the relative deformation between core glue and wireline, need improve the modulus of core glue, traditional method is to increase black loading, can cause fillers dispersed inequality in the course of processing but increase black loading; And the rubber unvulcanizate hardness of high filler loading capacity is high, extremely is unfavorable for the coldmoulding of conveying belt; The loading level height also can make the conveying belt finished product in use give birth to heat greatly, and one side is unfavorable for energy-conservation, accumulates continuously on the other hand heat reduced the work-ing life of conveying belt.
Summary of the invention
One of purpose of the present invention is to overcome the deficiencies in the prior art, and the flame-proof armored rope core conveyer belt core glue of a kind of soft, high antifatigue extraction performance is provided, and it not only has good processing characteristics, and tired extraction performance also is improved.
Another object of the present invention is to provide the preparation method of described flame-proof armored rope core conveyer belt core glue.
according to technical scheme provided by the invention: soft, the flame-proof armored rope core conveyer belt core glue of high antifatigue extraction performance, it is characterized in that: comprise following feed composition: 10-20 weight part natural rubber, 10-20 weight part cis-1,4-polybutadiene rubber, 60-80 weight part chloroprene rubber CR3222, 10-30 weight part strengthening agent, 10-20 weight part tackiness agent, the 40-80 parts by weight of flame retardant, 1-5 weight part anti-aging agent, 1-4 weight part sulphur, the vulcanizing agent of 0-4 weight part, the 2-4 part by weight of zinc oxide, 2-3 weight part magnesium oxide, 1-2 weight part promotor, 2-3 weight part activator.
Described natural rubber is to adopt the preparation of emulsion flocculence.Natural rubber has self-enhancement, has higher mechanical strength, has simultaneously good processing characteristics, and over-all properties is more excellent than other rubber.
Described chloroprene rubber 3222 is synthetic rubber, due to chloride in chloroprene rubber, can decomposite hydrogenchloride when burning fire is extinguished, can produce certain flame retardant effect, and chloroprene rubber has good bond properties, can reach well bonding with rubber cover and wireline.The chloroprene rubber CR3222 that uses in the present invention mixes with sulphur and curing di-isopropyl sulphur ortho ester the chloroprene polymer of regulating, fire-retardant good stability, and mooney viscosity is moderate, is therefore the desirable glue kind of flame-proof armored rope core conveyer belt core glue.
Described cis-1,4-polybutadiene rubber is synthetic rubber, it is few that cis-1,4-polybutadiene rubber has hysteresis loss, give birth to heat low, the advantages such as fatigue performance is good, use the tired extraction performance that can improve Steel cord glue in core glue, and in the chloroprene rubber course of processing, easy roll banding, incorporate appropriate cis-1,4-polybutadiene rubber into and can obviously improve the chloroprene rubber roll banding, makes production smooth.
Described strengthening agent is carbon black N550.
Described activator is stearic acid.
Described vulcanizing agent is DTDM.
Described anti-aging agent is antioxidant BLE (acetone and pentanoic pyrocondensation thing).It makes goods that good antioxygen, heat-proof aging and superior flexible resistance be arranged, and can improve the bounding force of rubber item and metal, and can improve the mobility of sizing material, cross-linked rubber living heat during dynamic fatigue is lower, so antioxidant BLE is the ideal chose of flame-proof armored rope core conveyer belt core glue.
Described tackiness agent is one or more the mixture in cobalt boracylate and white carbon black.The tackiness agent that uses the earliest is generally cobalt stearate, cobalt naphthenate etc., and this class cobalt salt initial adhesion power is higher, but aging rear bounding force descends very fast.Because cobalt boracylate very easily discharges active cobalt, also generate the boron acyl group simultaneously, and the boron acyl group both had been conducive to the thermotolerance of sizing material, was conducive to again the erosion resistance of sizing material.Therefore use cobalt boracylate can improve rubber and the bond properties of steel wire under the aging conditions such as heat, oxygen, steam, moisture, acid, alkali, and then improve the tired extraction performance of wireline in core glue.
Described promotor is accelerator NS (TBBS; N tert butyl benzothiazole 2 sulfenamide); Select and Apply suitable vulcanization system; guarantee that rubber unvulcanizate has good coke burning performance; being beneficial to the later stage carries out Compound Machining; simultaneously, obtain good crosslinking structure, guarantee that cross-linked rubber has good resistance to fatigue.
Described fire retardant is one or more the mixture in 70# clorafin, antimonous oxide and zinc borate.
The preparation method of soft, high resistance to fatigue flame-proof armored rope core conveyer belt core glue is characterized in that: comprise following process:
(1) plasticate: in two roller mills, add the chloroprene rubber CR3222 of 60-80 weight part to plasticate, reach 0.4 when above to plasticity number, the natural rubber of the 10-20 weight part that adds the cis-1,4-polybutadiene rubber of 10-20 weight part and plasticate is jointly plasticated and is glue stuff compounding, the time of plasticating is 25 ~ 35 minutes, and plasticating temperature is in 60 ℃;
(2) mixing: as to add successively 2-3 weight part activator in described glue stuff compounding, the anti-aging agent of 1-5 weight part, the tackiness agent of 10-20 weight part, the magnesium oxide of 2-3 weight part, the strengthening agent of 10-30 weight part, the fire retardant of 40-80 weight part, carry out one section mixing; After parking 10 ~ 12 hours, add the sulphur of 1-4 weight part, the vulcanizing agent of 0-4 weight part, the promotor of 1-2 weight part, the zinc oxide of 2-4 weight part mixes in mill and obtains two-stage mixing glue;
(3) after parking the two-stage mixing glue that obtains more than 7 ~ 9 hours, extrude slice on forcing machine, obtain carrying belt carcass glue film, extrusion pressure is 0.5-0.6MPa, and extrusion temperature is 60-80 ℃.
At normal temperatures, respectively with upper rubber cover and core glue, lower rubber cover and core glue assembly on workbench, then with upper rubber cover and core glue, lower rubber cover and core glue and the coldmoulding of ST1600 wireline, band embryo after moulding is vulcanized on vulcanizing press, sulfurizing temperature range is at 140 ~ 170 ℃, and sulfide stress is at 10 ~ 15MPa; Band embryo after sulfuration just can obtain soft, high antifatigue extractable flame-proof armored rope core conveyer belt through after cold formed.
The present invention compared with prior art, advantage is:
(1) under the prerequisite of the present invention's black loading in not increasing core glue, by adjusting the vulcanization system in flame-proof armored rope core conveyer belt core glue, improved the modulus of flame-proof armored rope core conveyer belt core glue, thereby make flame-proof armored rope core conveyer belt core glue not only have good processing characteristics, and tired extraction performance is improved.
(2) vulcanization system of the present invention's employing extends the time of scorch of core glue rubber unvulcanizate, thereby has promoted processing safety.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
In following examples, raw material used is the market purchase.
Embodiment 1
(1) plasticate: in two roller mills, add the chloroprene rubber CR3222 of 75 weight parts to plasticate, reach 0.4 when above to plasticity number, the natural rubber of 10 weight parts that add the cis-1,4-polybutadiene rubber of 15 weight parts and plasticate is jointly plasticated and is glue stuff compounding, the time of plasticating is 25 minutes, and plasticating temperature is in 60 ℃;
(2) mixing: as to add successively the stearic acid of 2 weight parts in the described glue stuff compounding, the antioxidant BLE of 1.4 weight parts, the cobalt boracylate of 2 weight parts, the white carbon black of 15 weight parts, the magnesium oxide of 2 weight parts, the carbon black N550 of 22 weight parts, the 70# clorafin of 45 weight parts, carry out one section mixing; After parking 12 hours, add the sulphur of 1 weight part, the N tert butyl benzothiazole 2 sulfenamide of 1.3 weight parts, the zinc oxide of 2 weight parts mixes in mill and obtains two-stage mixing glue;
(3) after parking the two-stage mixing glue that obtains more than 9 hours, extrude slice on forcing machine, obtain carrying belt carcass glue film, extrusion pressure is 0.5-0.6MPa, and extrusion temperature is 60-80 ℃.
Described conveying belt carcass glue film is vulcanized on vulcanizing press, and 150 ℃ of curing temperatures, sulfide stress are 10MPa.Its performance sees Table 1.
Embodiment 2
(1) plasticate: in two roller mills, add the chloroprene rubber CR3222 of 75 weight parts to plasticate, reach 0.4 when above to plasticity number, the natural rubber of 10 weight parts that add the cis-1,4-polybutadiene rubber of 15 weight parts and plasticate is jointly plasticated and is glue stuff compounding, the time of plasticating is 25 minutes, and plasticating temperature is in 60 ℃;
(2) mixing: as to add successively the stearic acid of 2 weight parts in the described glue stuff compounding, the antioxidant BLE of 1.4 weight parts, the cobalt boracylate of 2 weight parts, the white carbon black of 15 weight parts, the magnesium oxide of 2 weight parts, the carbon black N550 of 22 weight parts, the 70# clorafin of 45 weight parts, carry out one section mixing; After parking 12 hours, add the sulphur of 1 weight part, the DTDM of 1 weight part, the N tert butyl benzothiazole 2 sulfenamide of 1.3 weight parts, the zinc oxide of 2 weight parts mixes in mill and obtains two-stage mixing glue;
(3) after parking the two-stage mixing glue that obtains more than 9 hours, extrude slice on forcing machine, obtain carrying belt carcass glue film, extrusion pressure is 0.5-0.6MPa, and extrusion temperature is 60-80 ℃.
Described conveying belt carcass glue film is vulcanized on vulcanizing press, and 150 ℃ of curing temperatures, sulfide stress are 10MPa.The core colloidality can see Table 1.
Embodiment 3
(1) plasticate: in two roller mills, add the chloroprene rubber CR3222 of 75 weight parts to plasticate, reach 0.4 when above to plasticity number, the natural rubber of 10 weight parts that add the cis-1,4-polybutadiene rubber of 15 weight parts and plasticate is jointly plasticated and is glue stuff compounding, the time of plasticating is 25 minutes, and plasticating temperature is in 60 ℃;
(2) mixing: as to add successively the stearic acid of 2 weight parts in the described glue stuff compounding, the antioxidant BLE of 1.4 weight parts, the cobalt boracylate of 2 weight parts, the white carbon black of 15 weight parts, the magnesium oxide of 2 weight parts, the carbon black N550 of 22 weight parts, the 70# clorafin of 45 weight parts, carry out one section mixing; After parking 12 hours, add the sulphur of 2 weight parts, the DTDM of 2 weight parts, the N tert butyl benzothiazole 2 sulfenamide of 1.3 weight parts, the zinc oxide of 2 weight parts mixes in mill and obtains two-stage mixing glue;
(3) after parking the two-stage mixing glue that obtains more than 9 hours, extrude slice on forcing machine, obtain carrying belt carcass glue film, extrusion pressure is 0.5-0.6MPa, and extrusion temperature is 60-80 ℃.
Described conveying belt carcass glue film is vulcanized on vulcanizing press, and 150 ℃ of curing temperatures, sulfide stress are 10MPa.The core colloidality can see Table 1.
Table 1: the Performance Ratio of Comparative Examples of the present invention, embodiment
Performance |
Embodiment 1 |
Embodiment 2 |
Embodiment 3 |
Tensile strength/MPa |
19.3 |
17.5 |
16.7 |
100% stress at definite elongation/MPa |
3.2 |
4.5 |
5.6 |
300% stress at definite elongation/MPa |
10.5 |
12.3 |
14.8 |
Elongation at break/% |
564 |
494 |
465 |
Tension set/% |
30 |
25 |
25 |
Shao A hardness |
68 |
68 |
70 |
Extraction/N. mm-1 |
140 |
156 |
168 |
The tired extraction out/time |
3780 |
13500 |
24800 |
Time of scorch |
3:21 |
4:31 |
5:02 |
Carry the physical and mechanical properties testing method of belt carcass glue to come the mechanical property of test compound material by the ASTMD412 standard.Stretching experiment adopts the wide cut-off knife of 4.00mm dumbbell plate processed without exception, and draw speed is 500mm/min, and probe temperature is 25 ℃.Wireline is extracted out and tired extraction performance wireline used is ST1600.Other performance tests are all completed according to the ASTM standard.
Performance Ratio by embodiment 1 ~ 3 can be found out: vulcanization system (sulphur and DTDM) is though the tensile strength of the conveying belt carcass glue after adjusting decreases, and changes in hardness is little, and this can guarantee core glue good processing characteristics in the coldmoulding process; The tired extraction power of the wireline of the conveying belt carcass glue after adjustment raises, and core glue and the bonding of wireline after this explanation vulcanization system adjustment are improved; 100% stress at definite elongation and 300% stress at definite elongation all raise, so the tired number of times of extracting out of wireline raises; The time of scorch of the conveying belt carcass glue after adjustment extends.SMIS glue rubber unvulcanizate of the present invention has good processing characteristics, makes simultaneously to carry the tired extraction performance of belt carcass glue to be greatly improved.