CN102359668A - Flame retardant and antistatic steel mesh skeleton polyethylene composite pipe for mining and manufacturing method thereof - Google Patents
Flame retardant and antistatic steel mesh skeleton polyethylene composite pipe for mining and manufacturing method thereof Download PDFInfo
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- CN102359668A CN102359668A CN201110291310XA CN201110291310A CN102359668A CN 102359668 A CN102359668 A CN 102359668A CN 201110291310X A CN201110291310X A CN 201110291310XA CN 201110291310 A CN201110291310 A CN 201110291310A CN 102359668 A CN102359668 A CN 102359668A
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Abstract
The invention relates to a flame retardant and antistatic steel mesh skeleton polyethylene composite pipe for mining and a manufacturing method thereof. The method is characterized in that the polyethylene composite pipe is obtained by the manufacturing processes of subjecting dedicated composite modified polyethylene plastics to flame retarding and antistatic treatment in two steps, compositing the treated plastics with a high-strength steel mesh skeleton and a hot melt adhesive bond for several times, and heating and vacuuming the composite for several times. At least two layers of high-strength steel wires are wound to be reticulate in an oblique crossing manner, arranged between the outer wall of the inner layer and the inner wall of the outer layer as a skeleton, and tightly combined with the pipe body of the inner and outer layers into an integral whole by means of a hot melt adhesive, thus forming a composite pipe for underground coal mines, which is flame-retardant and antistatic and has relatively high mechanical strength and pressure resistance, long service life and other excellent properties. As the pipes are connected through welding by electric melting pipe fittings, the flame retardant and antistatic steel mesh skeleton polyethylene composite pipe for mining has high overall properties and convenience in laying, is applicable to the coal mine industry with strict property requirements in all aspects, and is also applicable to water supply and drainage, fire protection and gas delivery in the municipality and construction.
Description
Technical field
The present invention relates to a kind of polyethylene compound pipe, relate in particular to antistatic steel wire mesh frame polyethylene compound pipe of a kind of mining flame-retardant and preparation method thereof.
Background technique
Feedwater under the mine, draining, positive pressure ventilation, negative pressure ventilation, whitewash, draw out methane and the operations such as protection of power cable, fiber optic communications signal cable in, all use various tubing inevitably.Because work under bad environment in the mine is much higher more than general occasion to the requirement of used tubing.There is inflammable, explosive gas such as mine, when reaching finite concentration, even the spark that causes when a little discharging like static; Also possibly ignite it; Even gas explosion possibly take place, and breeding a tragedy, this just has higher requirement to the flame retardant property and the anti-static electricity property of tubing.
Generally speaking, steel pipe commonly used and plastic tube under the coal mine.Being prone to of existing though steel pipe intensity is high get rusty, shortcoming such as corrosion-resistant rapid heat dissipation not, causes its life-span short, use a period of time after, need often safeguard; And steel pipe proportion is bigger, difficult installation, and quality also is difficult to guarantee during welding, and expense is high, and also not environmental protection is replaced by the corrosion-resistant plastic pipe gradually.But defectives such as plastic tube intensity is low, yielding, be prone to embrittlement, anti-static electricity property difference receive external force collision or damage easily when being shaken, and there is potential safety hazard in long-time the use.And frequent maintenance also influences normal production.
For eliminating the deficiency of two kinds of tubing, general with the composite pipe replacement that ideal tensile strength and excellent corrosion resistance are arranged.Composite pipe has possessed the advantage of metal tube and plastic tube, in mechanical strength, not yielding, withstand voltage, corrosion-resistant, heat-resisting, insulation.Common have steel wire node framework composite tube and a Punching steel strip framework composite tube.
The steel wire node that steel wire node framework composite tube adopts is welded into the steel-plastomer system of simple shape skeleton; In order to guarantee welding reliability, strengthen steel wire and can only adopt mild steel wire, its tensile strength generally is controlled at 400MPa~500MPa; Add to adopt and be similar to spot-welding technology; Also can cause the part loss of strength of low carbon steel, therefore, heavy caliber pipe internal pressure-resistant ability is not high.
The Punching steel strip framework composite tube adopts Punching steel strip to be welded into the steel-plastomer system of cylindrical skeleton; In order to guarantee the welding of longitudinal seam quality; The steel plate that strengthens also can only adopt low carbon steel plate, and its tensile strength control is controlled at 360MPa~420MPa, adds that punching makes loss of strength 40%; Therefore, this steel-plastic composite intensity is not high yet.
For example the patent No. is 201020543607.1 again, name is called the disclosed a kind of coal mine of " a kind of coal mine is with steel band skeleton polyethylene compound pipe " utility application with steel band skeleton polyethylene compound pipe; Its scheme is: steel band skeleton polyethylene compound pipe is to be the internal and external layer body material with the polyethylene; With surface applied high-performance adhering resin, the steel band of brake forming is sticked between the internal and external layer polyethylene matrix material that is coated with adhering resin.With the high tenacity of steel, high hardness plastics corrosion-resistant, the life-span long, low-cost, the intensity that makes things convenient for transportation and installation, withstand voltage and external pressure, tightness characteristics.This model utility does not indicate this composite pipe and has fire-retardant, antistatic property; And this composite pipe junction does not solve the interface problem of steel-mould, and has the defective of seam between the composite pipe steel is moulded; Be easy to generate " delamination " phenomenon; Also exist in the not high enough shortcoming of axial stretch-proof ability, shockproof anti-fracture performance is not enough, to the stratum settlement bad adaptability.
And, because the thinner thickness of outer layer plastic, and in the welding zone steel to strengthen bulk area too big; Like φ 110 outer tube layer plastics thickness is 1.5mm~2mm, and the steel plate area accounts for 72% of whole welding area, therefore; In the electric fusion welding termination process, the heat that weld tubing outer layer plastic obtains is easy to strengthened bulk absorption and be transmitted to other part by steel plate, makes pipe outer surface plastics temperature reduce; And with electrothermal smelting tube internal surface plastics appearance temperature gradient; It is poor to cause face of weld to merge, and the tubing welding performance descends, and Joint Reliability is poor.After adopting common electrothermal smelting tube melting welding, the bursting pressure of its joint can not surpass 2.0Mpa, because medium has just broken through very thin outer PE along the gap channelling of steel-between moulding under the low pressure, causes low pressure to destroy.That uses in transport condition comparatively harsh mine, chemical industry, bittern, oil and combustion gas field is restricted.
Summary of the invention
The present invention combines the advantage of steel pipe and plastic tube, both kept the good load performance of steel pipe, kept the good sanitation performance of plastic tube again and be easy to lay, characteristics such as technology is reliable, long service life.Overcome composite pipe junction " delamination " phenomenon, the axial shortcoming of the not high enough and weldability difference of stretch-proof ability, provide a kind of fire-retardant, antistatic, corrosion-resistant, high pressure resistant, rigidity property is high, the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant of axial stretch-proof performance height and good welding performance and preparation method thereof.
Technological scheme of the present invention is: adopt layering manufacturing, repeatedly combination process moulding; Comprise the internal and external layer plastics, strengthen skeleton binder course and inner plastic; Strengthen the skeleton binder course between outer layer plastic and inner plastic; Outer layer plastic and inner plastic are combined into an integral body, it is characterized in that: said enhancing skeleton binder course is made up of steel wire mesh frame and PUR; Said outer layer plastic and inner plastic are fire-retardant, the antistatic composite modified high-density polyethylene material of process.
Said enhancing skeleton binder course refers to the mesosphere of being made up of steel wire mesh frame and PUR.PUR and steel wire have extremely strong adhesive property; Steel wire is coated on wherein,, forms an integral body with the ethene in outer layer plastic and the inner plastic is combined into; Solved the interface problem of steel-PE; Having overcome aforementioned steel-plastomer is the defective that has seam between the composite pipe steel is moulded, and further avoids the junction to produce " delamination " phenomenon, has significantly improved the combination property of composite pipe.
Said inner plastic and steel wire mesh frame are the major component of bearing external pressure in the tubing, and outer layer plastic is to be welded to connect major component.
Said fire-retardant, antistatic composite modified be because polyethylene be inflammable, high insulating material, its oxygen index is 17, surperficial average resistivity is greater than 1 * 10
16Ω does not reach fire-retardant, anlistatig requirement.Through adding fire retardant and filler, make it have flame-retarding characteristic, reduce its specific resistance to can leaking static charge fast, to reach application requirements such as fireproof antistatic with certain electric conductivity.And adopt two step processing methods, and carry out granulation, improve the dispersiveness of auxiliary agent, guarantee that product performance are stable.
Further, for optimizing performances such as fire-retardant, antistatic, also can in material modified, add necessary dispersing agent and oiling agent.
Said layering is fabricated to inner plastic (core pipe), steel wire wound web skeleton, heat-fusing glue layer, outer layer plastic and makes sequentially.
Said repeatedly complex technique is compound for repeatedly, heating for multiple times, and the manufacturing process of vacuum repeatedly is promptly in the layering manufacture process; Extrude inner plastic earlier, adopt the outer sizing principle moulding of vacuum, be heated; Winding steel wire network framework on inner plastic heats once more again, makes sandwich layer pipe and steel wire mesh frame reach certain temperature; Follow compound one deck PUR, behind the compound again outer layer plastic, through the manufacturing process of vacuum cooling moulding.
Further, steel wire mesh frame is the two-layer at least two-way reticular structure that is wound in of high-tensile steel wires, makes tubing have the good load performance of steel pipe.
Further, steel wire mesh frame at least one deck be that high-tensile steel wires are " cross plastic-steel silk ".Said " crossing the plastic-steel silk " is the high-tensile steel wires that coat with fire-retardant, antistatic composite modified high-density polyethylene material in advance, makes the interface of steel-PE combine better.
Adopt the layering manufacturing, repeatedly combination process has guaranteed reliability and the uniformity that each layer is compound, has also guaranteed the controllability and the uniformity of each layer thickness, has further improved quality of product.This technology is compound more advanced than the single of general composite pipe, can effectively prevent the generation of " delamination " phenomenon.
The tubing of same material connects and adopts the electric melting pipe fittings welding, utilizes pipe fitting inner heat body with tubing outer layer plastic and the fusion of pipe fitting inner plastic, links together two or many tubing reliably.Because it is less that the steel wire area of contour accounts for the percentage that fuses area, reduce the heat loss in the fusion process, significantly reduce the temperature gradient of pipe outer surface and internal surface, pipe performance is significantly improved.This welding manner technological operation is simple, easy construction, and fuse stable performance, air-tightness is good, joint strength is high, anti-axle body pulling force ability is strong, is not subject to the influence of variation of ambient temperature and personal factor, reliability is high.Electric melting pipe fittings mainly contains that electric smelting is isometrical directly, the electric smelting reducing directly, electric smelting equal tee, electric smelting reducing tee, electric smelting 90 degree elbows, electric smelting flange, the straight-through broken end of electric smelting etc.
Tubing through above scheme is made has beneficial effect to be: owing to used fire-retardant, antistatic composite modified high-density polyethylene material with excessivelying, and performance such as tubing tool Hu is fire-retardant, antistatic, corrosion-resistant, wear-resistant; The existence of steel wire mesh frame, make also that prepared tubing has intensity height, good rigidly, pliability, ring stiffness is good, load performance is good, good impact resistance, low, the anti-quick cracking performance of thermal conductivity are good, at a slow speed good, the axial tensility of crack propagation performance good, to strong, the shockproof advantage such as anti-fracture of stratum settlement adaptability.And, reliable performance, hygienic environment-protecting, long service life, good welding performance, easy transportation and installation.
Owing to have a lot of plurality of advantages, the present invention can be widely used in the various engineerings, like fields such as metallurgical mine, gas field, oil field, chemical industry, municipal engineering, power engineering, seawater conveying, agricultural sprinkling irrigations.
Description of drawings
Fig. 1 is the antistatic steel wire mesh frame polyethylene compound pipe of a mining flame-retardant structural representation.
Fig. 2 carries out the composite modified preparation process's flow chart of flame-retardant and anti-static for high-density polyethylene material, and wherein " other auxiliary agent " comprises " dispersing agent " and " oiling agent ".
Fig. 3 is the antistatic steel wire mesh frame polyethylene compound pipe of a mining flame-retardant preparation process flow chart.
Description of reference numerals:
1, outer layer plastic 2, PUR 3, steel wire mesh frame 4, inner plastic
Below in conjunction with accompanying drawing and embodiment, the present invention and useful technique effect thereof are further elaborated.
Embodiment
Referring to Fig. 1, composite pipe mainly is divided into three layers, enhancing skeleton binder course, inner plastic 4 that outer layer plastic 1, steel wire mesh frame 3 and PUR 2 are formed.Strengthen the skeleton binder course between outer layer plastic 1 and inner plastic 4; That is to say between core tube outer surface and the external pipe internal surface; Under the uniform temperature condition, high performance PUR 2 is realized the strong bonded of the modified poly ethylene in steel wire mesh frame 3 and outer layer plastic 1 and the inner plastic 4 at the joint interface place of steel wire and plastics.Because steel wire mesh frame 3 is covered by among the continuous thermoplastic plastics, form and strengthen skeleton, and it is as a whole through combination process steel wire mesh frame 3 and outer layer plastic 1 and inner plastic 4 to be combined into, and has significantly improved the composite pipe combination property.
Said steel wire mesh frame 3 is characterized in that: the two-way reticular structure that is wound in of two-layer at least steel wire.
Further, said steel wire mesh frame 3 is characterized in that: one deck is that steel wire coats with fire-retardant, antistatic composite modified high-density polyethylene material in advance at least, is " crossing the plastic-steel silk ".
Preferably, steel wire is high-tensile steel wires, and tensile strength is 1800MPa~2100MPa, and therefore the ability of steel wire mesh frame 3 internal pressure-resistants of the present invention is significantly improved, and is 4~8 times that two kinds on mild steel wire anastomose point skeleton and punching low carbon steel plate steel band skeleton strengthens body.For example, qualified φ 250 hole pattern steel band pipe normal temperature bursting pressures are 4.3MPa~4.5MPa, and qualified φ 250 steel wire mesh frame polyethylene compound pipe normal temperature bursting pressures are 8.0MPa~8.4MPa.Be converted into 2.5~3 times of safety coefficient and obtain and the working pressure of composite pipe is a bursting pressure, so the working pressure of composite pipe is significantly improved relatively.
Preferably, PUR 2 adopts high performance adhesive material modified, belongs to material of the same race with the polythene material of outer layer plastic 1, inner plastic 4, with steel wire very strong adhesive property is arranged, and solves the interface problem of steel-PE, avoids the junction to produce " delamination " phenomenon.
Further, PUR 2 is preferably the modified material of HDPE (high density polyethylene (HDPE)), reaches 200N/25mm according to the ASTM standard, and its softening temperature is greater than 120 ℃, and this product is preferably the product of du pont company.
Said outer layer plastic 1 and inner plastic 4 all adopt and have carried out fire-retardant, antistatic composite modified high-density polyethylene material and carry out the hot melt extruding and moulding.
Said fire-retardant, antistatic composite modified finger polythene material makes it have flame-retarding characteristic, reduces its specific resistance, to reach application requirements through adding fire retardant and having the filler of certain electric conductivity.Further, add auxiliary agents such as suitable dispersing agent, oiling agent and promote the polythene material performance.
Preferably, fire retardant is selected addition type low toxicity halogenated flame retardant efficiently for use, further is preferably bromide fire retardant, and with the compound use of auxiliary flame retardant through handling, make the tubing oxygen index be not less than 27, to reach fire-retardant requirement.
Preferably, it is main inorganic conductive powder and organic antistatic agents that antistatic modified filler adopts with the conductive carbon black, makes poly surface resistivity reduce to 10
5~10
8Ω makes the material surface static charge can leak into the earth fast.
Referring to Fig. 3; Described combination process is preferably the preparation method of the composite modified high-density polyethylene compound pipe of a kind of flame-retardant and anti-static, and its manufacturing process is compound for repeatedly, heating for multiple times; The manufacturing process of vacuum repeatedly; Being wound in steel wire mesh frame with two-layer steel wire oblique is example, it is characterized in that it comprises the steps:
A, fire-retardant, the antistatic composite modified high-density polyethylene material of preparation;
The material of b, preparation is expressed into core pipe specialized mould in core pipe extruder;
C, through shaping machine set, inner plastic 4 vacuum sizing moulding;
D, inner plastic 4 place baking oven to heat;
E, two-way winding one deck is crossed plastic-steel silk and layer of steel wire and is formed steel wire mesh frame 3 on inner plastic 4;
F, inner plastic 4 and steel wire mesh frame 3 place baking oven to heat;
G, in the binder course extruder, extrude binder course PUR 2;
H, in outer extruder, extrude outer layer plastic 1;
In i, compound in outer composite dies, outer layer plastic 1 cover PUR 2, steel wire mesh frame 3 and inner plastic 4;
J, at last in the cooling forming unit, the vacuum cooling moulding.
Referring to Fig. 2, said fire-retardant, preparation method that the anti-static polyethylene PP Pipe Compound is preferably the composite modified high-density polyethylene material of a kind of flame-retardant and anti-static comprises following steps:
A, fire retardant, anti-static agent, dispersing agent and oiling agent are concentrated by component, process two anti-masterbatch;
B, the two anti-masterbatch of general and polyethylene are blended into the semi-finished product material in proportion;
C, with the semi-finished product material through double-screw extruding pelletizing, accomplish material preparation.
Through the material of this two steps processing method preparation, can improve the dispersiveness of auxiliary agent, guarantee that product performance are stable, no dust pollution helps large-scale production.
Tubing connects the melting welding of employing electric melting pipe fittings, and this method is applicable to the tubing that same material is processed.Its method is: an end of the tubing that will connect inserts respectively in the electric melting pipe fittings socket joint hole, is embedded with hidden spiral electric heating wire in the electric melting pipe fittings internal surface, after external electric heating wire tenminal block energising; Pipe fitting inner plastic expanded by heating; The tubing inner plastic is carried out " hot dipping " connect, the pipe outer surface that melts the internal surface of pipe fitting then and cooperate with it makes it to combine together; After the cooling, pipe fitting just closely is welded on one to tubing through pipe fitting.
According to the announcement and the instruction of above-mentioned specification and specific embodiment, those skilled in the art in the invention can also change and revise above-mentioned mode of execution.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection domain of claim of the present invention modifications more of the present invention and change, like the square tubular that obtains through distortion, special pipe etc.Accompanying drawing is a structural representation of the present invention; In order to supplementary explanation technological scheme of the present invention is described; To the present invention and do not constitute any limitation, especially the density of steel wire is not represented actual conditions of the present invention, only makes auxiliary reader understanding's schematic representation of the present invention.In addition, although used some specific term and notions in this specification, these terms and notion be explanation for ease just, the present invention is not constituted any restriction.
Claims (10)
1. antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant; Comprise outer layer plastic, strengthen skeleton binder course and inner plastic; Strengthen the skeleton binder course between outer layer plastic and inner plastic; Outer layer plastic and inner plastic are combined into an integral body, it is characterized in that: said enhancing skeleton binder course is made up of steel wire mesh frame and PUR; Said outer layer plastic and inner plastic are fire-retardant, the antistatic composite modified high-density polyethylene material of process.
2. the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant according to claim 1, it is characterized in that: steel wire mesh frame is the two-layer at least two-way reticular structure that is wound in of steel wire.
3. the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant according to claim 1 is characterized in that: said PUR is the modified material of HDPE.
4. the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant according to claim 1 is characterized in that: said flame-retardant modified for high-density polyethylene material add fire retardant after oxygen index be not less than 27.
5. the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant according to claim 4 is characterized in that: fire retardant is a halogenated flame retardant.
6. the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant according to claim 5 is characterized in that: halogenated flame retardant is a bromide fire retardant.
7. the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant according to claim 1 is characterized in that: antistatic modified add filler for polythene material with electric conductivity after surface resistivity reduce to 10
5~10
8Ω.
8. the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant according to claim 7 is characterized in that: conductive modified filler main component is a conductive carbon black.
9. the preparation method of the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant is characterized in that it comprises the steps:
A, fire-retardant, the antistatic composite modified high-density polyethylene material of preparation;
The material of b, preparation is expressed into core pipe specialized mould in core pipe extruder;
C, through shaping machine set, the moulding of inner plastic vacuum sizing;
D, inner plastic place baking oven to heat;
E, two-way winding one deck is crossed plastic-steel silk and layer of steel wire and is formed steel wire mesh frame on inner plastic;
F, inner plastic and steel wire mesh frame place baking oven to heat;
G, in the binder course extruder, extrude the binder course PUR;
H, in outer extruder, extrude outer layer plastic;
In i, compound in outer composite dies, outer layer plastic cover PUR, steel wire mesh frame and inner plastic;
J, at last in the cooling forming unit, the vacuum cooling moulding.
10. the preparation method of the antistatic steel wire mesh frame polyethylene compound pipe of mining flame-retardant according to claim 9 is characterized in that: prepare fire-retardant, antistatic composite modified high-density polyethylene material at said process step a and also comprise following steps:
A, fire retardant, anti-static agent, dispersing agent and oiling agent are concentrated by component, process two anti-masterbatch;
B, the two anti-masterbatch of general and polyethylene are blended into the semi-finished product material in proportion;
C, with the semi-finished product material through double-screw extruding pelletizing, accomplish material preparation.
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