Procedure for fabrication of pipe out of composite materials
FIELD: machine building.
SUBSTANCE: here is disclosed fabrication of pipe out of composite materials consisting in forming adhesion layer on mandrel, in successive forming sealing, stretching, power and under winding layers by winding composite materials impregnated with polymer binding and in following laying polymer binding on it. The sealing layer is formed by either winding two layers of a band out of non-woven material with pitch of 0.5 of band width impregnated with polymer binding and successive laying one layer of glass cloth on it or by winding two layers of the band out of glass cloth impregnated with glue at pitch of 0.5 of band width. The power layer is formed by the method of cross-layered lengthwise-cross winding out of strands of glass twisted complex thread soaked with polymer binding. The stretching layer is made by spiral-screw winding strands of glass twisted complex thread without impregnation with polymer binding. The under winding layer is formed by spiral screw or cross-layered lengthwise-cross winding strands out of glass twisted complex thread soaked with polymer binding.
EFFECT: increased weight perfection of transport-starting container out of pipe fabricated by winding composite materials; facilitation of pressure tightness and rigidity of pipe.
The invention relates to rocket technology, in particular to the manufacture of transport-launch containers for transporting, storing and launching rockets, the method of “wet winding” pipes made of composite materials, and can also be used in the national economy for the manufacture of pipes of different diameters and destination from sewer to water and takes into account the increasing requirements for higher perfection of their designs.
A known method of manufacturing a pipe made of composite materials (patent of Russia №2154766 from 20.08.2000,, MPK7 F16L 9/12), including the formation of mandrel sealing layer of rubber and the subsequent formation of the power frame by winding spiral layers of roving, impregnated with a polymeric binder, thus forming a sealing layer is carried out by winding on a mandrel, pre-coated with a layer of anti-adhesive material tape from devulcanizing chemically and abrazivostruynoy rubber with a thickness of 1 mm with a step equal to the width of the tape, and then wrap a second layer of tape from devulcanizing rubber offset relative to the first layer by 0.5 step and then the third layer is wound devulcanizing rubber starting winding from the opposite end of the mandrel, then install back-up ring made, for example, from a tape-nature is a, consisting of 3-5 layers, at a distance of 0.5-2.0 m along the length of the pipe, which is placed on 2-3 layers devulcanizing rubber, and in the area of the nipple ends also install support ring, then produce a wound package of five adhesive layers, this package includes sequential winding of one layer is not impregnated binding tape from a low density, for example, woven material, winding a layer of tape, non-woven fabric, impregnated with a binder, a double helical winding layer of a thickness not exceeding 1.2 mm glass or basalt roving thickness not exceeding 0.5 mm and a tension of the roving 0,4-2,0 kg 1 m Assembly roving, and then form the structure of power by winding package up to ten double-spiral layers of roving, and in the area of installation of each support ring to form an annular ledge in the form ravnomernogo triangle with rounded top, made of annular layers of roving, after which form at the ends of the pipe connecting elements.
However, this method of manufacturing a pipe made of composite materials and pipe manufactured according to this method, for all its merits, but it is a reliable ensure the integrity and rigidity of the pipe due to the complexity of forming the sealing rubber layer and a consistent location via a 0.5-2.0 m embedded items shall now - support rings, has the following disadvantages when applied to pipes made of composite material, of which further made transport-launch containers for transportation and storage of missile launch:
1) the complexity of manufacturing the sealing layer due to the need to carefully promote adhesion around the perimeter stacked on the mandrel devulcanizing tape rubber, because of this is placed a few layers of rubber with overlap by the width of the tape, which leads to unjustified increase of the mass of the resulting pipe is impractical;
2) internal rubber coating creates a lot of resistance when moving missiles in transport-launch container due to the large coefficient of friction rubber (inner surface of the container should be rigid and have a small coefficient of friction), which will lead to vibrations and disturbances in the launching of a rocket from the container with the launcher, which is unacceptable;
3) the possibility of ignition of the inner sealing layer of the transport and launch container at the exit of the rocket, since the temperature of the exhaust gases reaches 3000°C, which is also unacceptable.
Object of the present invention is to eliminate the above drawbacks, such as increasing the weight of perfection transport-launch Conte is Nera, made of pipes, made by filament winding of composite materials, ensuring its integrity and stiffness.
This is achieved in that in the method of manufacturing a pipe made of composite materials comprising forming mandrel with a release layer and the subsequent formation of sealing, mounting, power and palmoticeva layers by winding the composite material, impregnated with a polymeric binder, forming the sealing layer is produced or by winding two layers of tape, non-woven material with 0.5 of the width of the tape impregnated with a polymeric binder and then laying him one layer of fiberglass, or by winding two layers of strips of fiberglass impregnated with glue, with 0.5 of the width of the tape, forming a power layer produced by the method of the cross-longitudinal-transverse winding of the strands glass woven multifilament yarn, impregnated with a polymeric binder, forming forming layer produced by the method of spiral helical winding of the strands stekljannoi twisted multifilament yarn, impregnated polymeric binder, and forming palmoticeva layer depending on the design of the seats on the tube produced by the method of the spiral screw or method of the cross-longitudinal-transverse winding of strands of glass woven multifilament yarn,impregnated with a polymeric binder, when this mass fraction of the polymer binder used in the formation of power and palmoticeva layers should be at least 50%, and the impregnated composite materials provide preheated to 50-55°with a polymeric binder.
The essence of the invention lies in the fact that the new method of manufacturing a pipe made of composite materials provides optimal weight get pipes through the use of new composite materials, new technologies winding and the obtained experimental data due to the optimal selection of the necessary quantity of polymeric binder and a sealing layer that allows you to maintain a minimum weight, reliable sealing of the pipe, its strength and stiffness.
The drawing shows the proposed scheme winding pipe made of composite materials, where:
1 - pot;
2 anti - stick layer;
3 - sealing layer;
4 - power layer;
5 - forming layer;
6 - Podkolodny layer.
A method of manufacturing a pipe made of composite materials is as follows.
On a rotating mandrel 1, mounted on a winding machine, previously having degreased its surface, spraying method applied adhesive layer 2 of silicon grease. For the formation of the sealing layer from the front of the headstock of the machine in two passes made in the field, and the first winding of the first layer of tape, non-woven material Mat surface glass brand IPU” increments of 0.5 of the width of the tape, then produce the impregnation of the resulting layer of a polymeric binder, preheated to 55°C, aged 15-20 min until saturation, the frequency of rotation of the mandrel 10-12 rpm Then in the opposite direction from the tailstock of the machine to produce the winding of the second layer of the same material and in the same sequence. The obtained winding the sealing layer when the non-rotating mandrel in a longitudinal direction in a single pass over the entire length of the mandrel laid fiberglass, for example, grade: AU, TSA, ES-38, ES-P. Pets winding sealing layer to produce a ribbon of glass fabric pre-impregnated with adhesive BK-CG, impregnated polymeric binder in two passes with 0.5 of the width of the tape. Then make the winding of the power layer 4 by a method of the cross-longitudinal-transverse winding of strands of glass woven multifilament yarn, for example VMPS, IS impregnated with a polymeric binder. Then make a winding forming layer 5 in a single pass method spiral helical winding of strands of glass woven multifilament yarn, impregnated polymeric binder, because they are impregnated with a polymeric binder directly in the winding process of “wet method”, due to an excess of binder in the strands of the previous power layer. It is followed by the formation of palmoticeva layer 6 depending on the structure, the AI seats on the tube by the method of the spiral screw or method of the cross-longitudinal-transverse winding of strands of glass woven multifilament yarn, impregnated with a polymeric binder, with mass fraction of the polymer binder used in the formation of power and palmoticeva layers should be not less than 50%.
This is done to ensure the reliable exclusion of voids between the fibers in the layers during winding. Heating of the polymeric binder to 55°C provides the greatest fluidity of the binder, which is necessary for impregnation of composite materials. The polymerization of the polymeric binder is wound pipe is held in a heating Cabinet for 14 h at 160°C on a rotating mandrel that provides uniform distribution of the polymer binder according to the thickness of the pipe walls during polymerization. Removing the mandrel from the heating Cabinet is at a mandrel with a tube of normal temperature. To remove the cured pipe from the mandrel one of the ends of the tubes have a winding exceeding the outer diameter of the pipe, for which a special device to draw the pipe from the mandrel. After removing the pipe spend machining end faces and seats on the tube in the desired size.
In the manufacture of the pipe on the mandrel are two methods of winding - spiral-spiral method of winding (circular, tangential), which consists in laying the formed thread tape on the surface of the mandrel along a helical line, and the method of the cross-procainamidesee winding, at which layer of longitudinal-transverse reinforcement is formed not on the entire length of the mandrel and within the technological tape yarns are laid on the mandrel spiral-spiral method with small feed. While strands of ribbon ring reinforcement impregnated with a polymeric binder directly in the winding process “wet”impregnation of dry axial threads carried on the mandrel due to an excess of binder in the tape ring strands, while the axial dry yarn fed to the mandrel by means of a swivel, which revolves around moving impregnated polymeric binder tape.
1. A method of manufacturing a pipe made of composite materials comprising forming mandrel with a release layer and the subsequent formation of sealing, mounting, power and palmoticeva layers by winding the composite material, impregnated with a polymeric binder, characterized in that the formation of the sealing layer is produced by winding two layers non-woven tape material with 0.5 of the width of the tape impregnated with a polymeric binder and then laying him one layer of fiberglass or by winding two layers of strips of fiberglass impregnated with glue, with 0.5 of the width of the tape, forming a power layer produced by the method of the cross-longitudinal-transverse winding of the strands of the sty what Lannoy twisted complex thread impregnated with a polymeric binder, forming forming layer produced by the method of spiral helical winding of strands of glass woven multifilament yarn, impregnated polymeric binder, and forming palmoticeva layer produced by the method of the spiral screw or method of the cross-longitudinal-transverse winding of strands of glass woven multifilament yarn, impregnated with a polymeric binder.
2. The method according to claim 1, characterized in that the impregnation of composite materials provide a preheated 50÷55°With a polymeric binder.
SUBSTANCE: invention relates to use of an antioxidant to increase resistance of a polyolefin composition meant for making pipes to decomposition caused by contact with water, which contains CIO2. The antioxidant is selected from a) a group of phenols of formula I, where R is an unsubstituted or substituted aliphatic or aromatic hydrocarbon radical which can contain heteroatoms, or R is a heteroatom, R' and R" independently denote an unsubstituted or substituted hydrocarbon radical which can contain heteroatoms, or H, X1, X2 and X3 independently denote an unsubstituted or substituted hydrocarbon radical which can contain heteroatoms, or H or OH, where at least X1, X2 or X3 is OH, n assumes values from 1 to 4, and at least one of the phenol substitutes R, R' and/or R" contains at least one sulphur, phosphorus and/or nitrogen heteroatom or from b) amine compounds of formula II, where R1, R2, R3, R4, R5 and R6 independently denote a hydrogen atom or an aliphatic or aromatic hydrocarbon radical, possibly containing heteroatoms, or selected from c) sulphur-containing compounds of formula Ra-S-Rb III, where Ra and Rb independently denote an aliphatic or aromatic hydrocarbon radical, possibly containing heteroatoms.
EFFECT: antioxidant used has low susceptibility to extraction with water carried by a pipe made from such a polyolefin composition.
7 cl, 1 tbl, 2 ex
SUBSTANCE: invention relates to a polyethylene composition for making pipes, which contains a polymer base comprising two polyethylene fractions with different molecular weight, to a pipe containing said composition and to use of said composition to make articles, preferably pipes. The polymer base accounts for not less than 90 wt % of the overall composition and has density of 932-938 kg/m3.The fraction of ethylene homo- or copolymer (A) has lower average molecular weight than the fraction of ethylene homo- or copolymer. The polyethylene composition has melt flow rate MFR5 between 0.1 and 0.6 g/10 min and shearing stress η2.7 kPa between 85 and 230 kPa. The polyethylene composition has improved combination of properties, particularly high flexibility, high mechanical strength and good long-term stability.
EFFECT: pipes obtained from the disclosed polyethylene composition have good operational characteristics, long-term stability and good resistance to rapid propagation of cracks, which facilitates their use in conveying liquids under pressure.
16 cl, 1 tbl, 3 ex
SUBSTANCE: invention relates to a polyolefin composition which is suitable for making pipes. The composition used to make pipes contains polyolefin (A), a compound (B) which is bis(2,4-dicumyphenyl)pentaerythritol diphosphate, and a phenol compound (C) of formula (I), where R denotes an unsubstituted or substituted aliphatic or aromatic hydrocarbon radical, which can contain heteroatoms, or R denotes a heteroatom; each X1-X5 denotes H, OH and/or R'; where R' denotes a hydrocarbon radical or a hydrogen atom, and n equals 1-4; and g) possibly a stabiliser against UV light (D).
EFFECT: composition has low tendency to migration of additives and their decay products, particularly phenol compounds and a light stabiliser, not more than 1,8 mcg/l with surface to volume ratio S/V between 11,70 and 12,30 dm-1, without loss of stability.
10 cl, 3 tbl, 5 ex
SUBSTANCE: polymer base is not less than 90 wt % of the overall composition and has density of 940-947 kg/m3.The fraction of homo- or copolymer of ethylene (A) has lower average molecular weight than the fraction of homo- or copolymer of ethylene. The polyethylene composition has melt flow rate MFR5 of 0.1-0.5 g/10 min and viscosity reduction index during shear (2.7/210) of 10-49, has better combination of properties, in particular high flexibility and high mechanical strength and good long-term stability.
EFFECT: pipes made from the disclosed polyethylene composition have good performance properties, especially in terms of flexibility and rapid propagation of cracks while preserving minimal required strength, processing characteristics, impact viscosity and resistance to slow propagation of cracks.
14 cl, 1 tbl, 3 ex
SUBSTANCE: addition of a stabilising amount of a mixture to high density polyethylene, where the said mixture contains 4,4'-bis(α,α-dimethylbenzyl)diphenylamine and sterically hindered phenol, enables to increase resistance to decomposition caused by chlorinated water.
EFFECT: pipes made from such a stabilising composition are suitable for conveying hot water, particularly chlorinated water.
6 cl, 3 ex
FIELD: machine building.
SUBSTANCE: cooling agent pipeline includes the following layers: outer layer from moulding compound on the basis of polyamide; inner layer having the thickness at least of 0.3 mm and containing polypropene, 0.02 wt % of heat stabiliser. Polypropene is hetero-phase copolymer on the basis of propene, which contains 0.5 wt % to 20 wt % of ethene.
EFFECT: increasing heat stability and mechanical pipeline strength.
10 cl, 1 tbl
FIELD: machine building.
SUBSTANCE: multi-layer pipe is made out of composite material corresponding to reinforced materials in form of alternate mono-layers with cross and lengthwise laying of reinforced material impregnated, for example with thermo-reactive binding. Binding consists of internal and external structure layers divided with a barrier layer. The barrier layer is made out of a layer of heat insulating foam applied on external surface of the internal structure layer and of an additional layer arranged between the layer of heat insulating foam and internal surface of the external structure layer. The latter corresponds to successively lain metal screens out of continuous bands divided with polymer material.
EFFECT: increased heat resistance of wall of multi-layer pipe.
5 cl, 1 dwg
SUBSTANCE: method involves preparation of a mixture containing 5-50 wt % filler and 95-50 wt % low density polyethylene and 0-3 wt % of one or more stabilisers.The obtained mixture and high density polyethylene containing at least one low-molecular component which is a copolymer of ethylene and C3-C10 α-olefin are mixed in a molten mass until the end product is obtained at drop point of 165-185°C. The obtained composition for making tubes contains 1-20 wt % filler in terms of mass of the composition.
EFFECT: composition has better balance of properties and can be extruded with sufficiently high efficiency at optimal low melt temperature.
19 cl, 3 tbl, 7 ex
FIELD: technological processes.
SUBSTANCE: inventions relate to pipe of flaky composite material and method of its manufacturing. Method for manufacturing of pipe includes winding of inner glass plastic layer onto mandrel, bonding of intermediate foam plastic layer and winding of ribs and outer layer of glass plastic. In intermediate foam plastic layer there are circular grooves arranged for location of ribs. Ribs and outer layer is wound in a single technological operation by bundle of cross threads. Bundles are equipped with longitudinal threads, using method of cross-fibred longitudinal-transverse winding. At the same time longitudinal threads are bent as bundle changes from winding of external layer to winding of ribs and back with filling of each groove by mentioned bundle till ribs are formed.
EFFECT: improved manufacturability and reliability of glass plastic pipes operation.
2 cl, 4 dwg
FIELD: machine building.
SUBSTANCE: invention refers to pipe fabrication. The pressed shell containing layers of roll woven cloth with binding is made with circular layers of woven material in form of separate strips of length not less, than length of shell and width equal to perimetre of the latter with overlap.
EFFECT: increased reliability and expanded process functionality of pressed shell.
2 cl, 2 dwg
FIELD: pipeline engineering.
SUBSTANCE: pipe has wall provided with flat sections. The longitudinal projections and mating hollows are provided in the middle of opposite flat sections of the wall.
EFFECT: enhanced reliability of joining.
2 cl, 3 dwg
FIELD: plastic pipes.
SUBSTANCE: in biplastic pipe with inner layer made of thermoplast, outer layer made of glass plastic and grooves made on outer surface of inner layer, depth of grooves h is determined by formula h>Δα·Δt·din, where Δα is difference in coefficients of linear thermal expansion of materials of inner and outer layers; Δt is difference in maximum and minimum temperatures of transferred medium; din is outer diameter of inner layer.
EFFECT: improved strength and operation reliability of biplastic pipe.
3 cl, 3 dwg
FIELD: plastic pipes.
SUBSTANCE: in proposed biplastic pipe with inner layer made of thermoplast, outer layer of glass plastic and stiffening ribs secured on outer surface of inner layer, height of stiffening ribs h is determined by formula h>Δα·Δt·din, where Δα is different of coefficients of linear thermal expansion of materials of inner and outer layers; Δt is difference in maximum and minimum temperatures of transferred medium; din is outer diameter of inner layer.
EFFECT: improved strength and operation reliability of biplastic pipe.
3 cl, 3 dwg
FIELD: rigid pipes.
SUBSTANCE: cylinder wall comprises at least one layer made of fibers oriented at least in one direction. The total thickness of the wall dtot ranges from 0.010 mm to 1 mm. The ratio dtot/D ≥ 0.0025.
EFFECT: improved method of manufacturing.
20 cl, 4 dwg
FIELD: pipeline engineering.
SUBSTANCE: polymeric reinforced pipe comprises grid frame made of longitudinal metallic rods and transverse rods made of high-module fibers or cords wound along the longitudinal rods. The grid frame in the polymeric unit has additional lateral layer made of metallic rods wound directly on the longitudinal metallic rods. The transverse reinforcing rods made of high-module fibers are wound to provide several mutually perpendicular layers and are housed in the polymeric unit from the outer side of the layer of the metallic transverse rods. The method comprises feeding the longitudinal metallic reinforcing rods to the mandrel, making the layer of transverse reinforce made of high-module fibers, and filling the frame with a polymer. The transverse reinforcing layer made of metallic rod is directly wound on the metallic longitudinal rods, the frame is filled with a polymer, and then several mutually perpendicular layers of the transverse rods are wound on the surface obtained. The polymer is poured again. The longitudinal metallic rods are fed to the mandrel until the cross-section of the pipe is defined.
EFFECT: enhanced strength.
2 cl, 2 dwg
FIELD: pipeline engineering.
SUBSTANCE: reinforced polymeric pipe comprises inner and outer polymeric layer and reinforcing layer interposed between them and made of high-module fibers or cords, at least two layers of longitudinal rods and transverse rods wound on the longitudinal rods. The longitudinal rod is provided with thickenings throughout its length. The longitudinal rods of the first layer are submerged under the outer surface of the inner polymeric layer at a depth close to the half thickening. The method comprises making inner polymeric layer, laying the first layer of the longitudinal rods on its outer side, wounding transverse rods with interference, and forming the outer polymeric layer. Before laying, the longitudinal rods are provided with thickenings, and the outer side of the inner polymeric layer is heated up to plasticizing down to a depth of close to the half thickness. When winding the first transverse layer, the tension is chosen sufficient for the embedding the thickenings of the first layer of the longitudinal reinforce into the plasticized layer throughout its depth.
EFFECT: improved adhesion of reinforce with polymer.
2 cl, 1 dwg
FIELD: polymer materials.
SUBSTANCE: composition contains 0.05 to 0.24 hydrolyzable silane groups per 100 methylene units and shows standard density at least 954 kg/m3. Flowability factor of composition melt is below 1.5 g/10 min under loading 5 kg and above 2 g/10 min under loading 21.6 kg as measured in accordance with ASTM standard D 1238. Tube manufacture process envisages extrusion of composition in the form of tube in the first stage and subsequent hydrolysis of the tube in order to link cross-linkable polyethylene. Tubes manufactured according to present invention show high long-term resistance to pressure above 12.5 MPa as measured according to ISO/TR standard 9080 and can be used for transportation of fluid substances under high pressure.
EFFECT: improved consumer's quality of tubes.
13 cl, 4 ex
FIELD: manufacture of plastic pipes.
SUBSTANCE: proposed method includes placing the thermoplastic envelope on mandrel followed by winding fibrous material containing binder on this envelope and applying the outer polymer layer; then, polymerization is accomplished; twisted roving is used for wrapping the fibrous material at cross position of cords with through passages in between them; these passages are filled with thermoplastic melt for forming outer layer from this melt or by winding thermoplastic tape.
EFFECT: enhanced reliability.
FIELD: construction engineering; manufacture of plastic pipes.
SUBSTANCE: proposed pipe has metal branch pipe with locking components, thermoplastic envelope embracing them and reinforcing glass-reinforced plastic layer. Pipe is provided with crimping coupling of thermoplastic envelope in zone of locking components; metal branch pipe is fitted with additional locking component and glass-reinforced layer embraces crimping coupling and additional locking component.
EFFECT: enhanced reliability.
FIELD: mechanical engineering; pipe transport.
SUBSTANCE: invention can be used in laying plastic pipelines. Proposed biplastic pipe contains carrying layer made of glass plastic, lining layer and locking rings arranged along pipe axis. Lining layer is formed by winding thermoplastic material on pole to form T-shaped locking rings with winding of glass fabric impregnated with phenol-formaldehyde resin with subsequent solidifying of resin and melting of thermoplastic material. Caoutchouc-based raw calendered rubber is used as thermoplastic material, or polyethylene, polypropylene or polyvinylchloride film. Pipe is provided with bell for connecting the pipes with subsequent melting of lining layer in place of contact in bell part. To reinforce connection of pipes, sleeve-band is used which is arranged on outer surface of bell part. Pipe-to-pipe joint is reinforced by welding stainless material inserts.
EFFECT: improved reliability of pipeline.
6 cl, 5 dwg