Multi-layered case

 

(57) Abstract:

Usage: the invention relates to the production of reinforced fibers products: pipes, tanks, filter housings, etc. of the invention: multi-layer case provides multiple layers of a mixture of a binder and a fibrous filler, taken in different ratios. The inner layer contains carbon cloth, and the outer - glass-fiber filler and the intermediate layer. The inner layer is formed by winding layers of guledani, impregnated with phenol-formaldehyde binder, an intermediate layer made of thermoplastic polymer, and the outer layer contains a glass fiber impregnated with epoxy resin Dianova type with a ratio of layer thicknesses from 1: 1:( 1-45) until 6: 8: (10-45 mm), and the housing is further provided with a protective layer of thermoplastic polymer layers thermoregulation and heat and electric insulation, giving the body new operational properties. 3 C.p. f-crystals, 1 Il. table 1.

The invention relates to the production of reinforced fiber products, pipes, tanks, filter housings and can be used in chemical, petrochemical, construction, gas industry and other sectors of national economy the x structures, use different fillers (glass and carbon fiber fillers, glass microspheres, etc., and organic and mineral binders (resins, cements, etc.,) [1]. Such multilayer pipes are designed for use in hasmaintained pipelines and can be considered as a prototype.

There are also known methods of obtaining a multilayer chemical-resistant and conductive hybrid materials [2], including the impregnation of carbon and glass fabrics thermosetting binder. The pipes produced by this method may be considered similar.

The disadvantages of the prototype [1] and analogue of [2] is that the connection of heterogeneous agents with different binders results in structures with exceptionally high level of internal stresses. For example, the coefficient of thermal expansion of carbon fiber and fiberglass different order of magnitude, which leads to delamination at the interface of carbon fiber and fiberglass, to leaks, especially when multiple changing temperatures from -30 to +110oC.

The aim of the invention is the design of the multilayer body multi-purpose using the

The structure of the multilayer body shown in the drawing.

To reduce the possibility of delamination of the composite layered products prompted at the interface of dissimilar layers of carbon fiber and fiberglass additional 3 layer polyolefin (polyethylene, polypropylene) or polyester (polyethylene terephthalate) thermoplastic polymers that will significantly reduce the level of internal stresses, increase long-term durability at high temperature changes and provide a sealed enclosure.

To ensure the transportation of corrosive liquids such as acids, the inner layer 2 of the multilayer body features made of carbon fiber based on guledani "Ural T - 22", "Viscum", or other similar impregnated with phenol-formaldehyde binder. The thickness of the inner layer is selected depending on the aggressiveness of the environment and expected lifetime. The thickness of the outer strength layer of the laminate 4 is selected from the conditions of ensuring the strength of the product at specified temperature and time conditions of loading during operation.

For the use of the product according to the Present invention in hot and cold vodokanalnyh inner protective layer 1, made of telepractice polymer allowed to be used by the sanitary supervision. If this is allowed to produce additional internal protective layer 1 winding polyolefin film (polyethylene, polypropylene) with subsequent thermal welding of the layers of film together.

To provide special artificial heating the contents of the multilayer body is proposed to use an additional outer layer of thermoregulation 5 made of graphite fabric impregnated with phenol-formaldehyde binder, modified with special additives (for example, a mixture of natural graphite).

This allows for the presence of special electrical terminals to heat the contents of the enclosure to an acceptable temperature, using electrically conductive layer 5 with a guaranteed resistivity by passing an electric current from an external source. To ensure electronically and insulation in the outer layer 6 consisting of an elastic porous plastic material, e.g. polyurethane foam, which is applied to the already formed and approved multilayer body (layers 1 to 5), then megaloi the products, choose those or other raw materials: carbon and fiberglass, thermoplastic polymers in the form of films, the binder in the form of modified phenol-formaldehyde, epoxy, polyamide resins and other.

A method of manufacturing a multilayer body made of composite materials consists in the following. Carbon and glass fabric impregnated with the catalyst solution, dried in air or by blowing heated air, impregnated with a solution of phenol-formaldehyde resin or a modified epoxy-novolak binder in a ratio of 40-60 wt.% by weight of filler. At the same time cutting thermoplastic films on tape and winding them on giving the reel winding machine. Then, the mandrel, the pre-treating release composition, wound layers of thermoplastic films which are welded together special welding roller, and then wound layers of guledani, then again wound and welded thermoplastic intermediate layer, and then wound impregnated another binder for glass fiber fabric (tape) or roving with the given number of layers. On the power of fiberglass layer is placed termoreguliruyuschie layer of carbon fiber for obog the e resistivity layer thermoregulation. Then the billet housing is subjected to heat treatment at 125-185oC during the time corresponding to the wall thickness of the workpiece (average value of 10oC15 min 1 mm wall thickness of the product). Then cooled the workpiece is coated with a layer of electrical and thermal insulation (polyurethane foam) and again heat.

The following are examples of the fabrication and test results of multilayered cases received on the proposed decision.

Example 1. Polypropylene film (GOST 26996 - 86) of thickness 0.1oC0.2 mm is wound treated with a release lubricant to the mandrel to obtain a layer thickness of 1 mm (i.e., 10oC5 layers) with mandatory provarivanija layers with spinning welding roller at 145oC155oC. Carbon fabric brand Ural T-22 (GOST 28005-88) impregnated with 20% solution of benzosulfimide (TL6-36-020229-25-89), dried for 1.5oC2 h at 20-25oC in air. Then carbon fabric impregnated with a liquid phenol-formaldehyde resin SPI - 309 (GOST 20907 - 75) with density of the resin at the rate of 100% by weight of the carbon filler. Impregnated carbon fiber filler is wound on a polypropylene film. Number of layers 2. The top is wound with simultaneous welding is annoy fiberglass, the following.

Glass fabric brand T-13 (GOST 19170-73) impregnated with 3% ethanol solution of benzosulfimide, dried for 25 s at 40-45oC, impregnated with modified epoxy-novolak binder with tar 52-54% by weight of the product and then reel up on the previous layer of thermoplastic polymer. The number of layers 3. Modified epoxy-novolak binder is a joint solution of the resin ED-20(GOST 10587 -78) and Lac bekeley lbs (GOST 901-78), taken in the ratio of 70:30 on the dry residue in an organic solvent, providing spirtitually mixture in the ratio of 50:50.

This layer of the multilayer body is the defining strength and elastic properties of the structure.

The outer protective layer of thermal (heating layer) is formed by the winding 1 of a layer of carbon tape Viscum LN (TU 6-06-31-638-88) thickness 0.6 mm width 40 mm, impregnated with a solution of the modified phenol-formaldehyde resin SF-010 GOST 18694-80 adding a little natural graphite in an amount of 5oC10 wt.%) to adjust the electrical resistivity of the composite carbon fiber. The ends of the outer protective layer of thermoregulation forsvaret to maintain the contents at a certain calculated temperature of 25-60oC, especially in frosty winter weather.

The outer heat - insulating layer 6 is made of flexible polyurethane foam based on complex and polyethers of linear structure (1,4 butanediol or based on ethylene oxide, propylene) using toluylenediisocyanate, catalyst (50% aqueous solution of urea), emulsifier (surfactant OP-10), a foam stabilizer (sulfanilate) and regulator of foam (vaseline oil). The multilayer body is installed in a special form, which is poured raw components in the following ratio, wt%):

Polyester - 100

Toluylenediisocyanate - 33 - 44

Water is 2.0 - 2.5

Catalyst - 1,5 - 2,0

Emulsifier - 1,0 - 1,5

The regulator foam - 0,1 - 0,3

Filled the form is placed in a chamber heated to 35 - 40oC. the Cycle during which a foaming layer, lasts for 12 to 15 minutes, then run in and separate form, the multilayer body is removed from the mold. Then the form is cleaned, fanned and grease separator composition for the next fill.

The thickness of the heat and electric insulation was determined by the gap forms in the first example was 5 mm

Example 2. Manufacturing technology fully sooa of prepreg); 3rd layer polypropylene 3 mm; 4-th layer of fiberglass 6 mm (15 layers); 5th layer - heater - 2 layers of CFRP 1.2 mm; 6-th layer of heat and electrical insulation 10 mm

Example 3. The production technology is identical to example 1, the combined thickness of the other layers: 1st layer polypropylene 5 mm; the 2nd layer of carbon 1.5 mm; the 3rd layer polypropylene 5 mm; 4-th layer of diploblastic 20 mm; 5-th layer thermostat (heater) - 2 layers of CFRP 1.2 mm; 6-th layer of heat and elektroizolyatsiyu 15 mm

Example 4. The production technology is identical to example 1, the combination of the other layers: 1 layer of 6 mm; the 2nd layer of 1.5 mm; the 3rd layer 6 mm; 4-th layer 35 mm; 5-th layer 1.2 mm; 6-th layer 15 mm

Example 5. The production technology is identical to example 1, the combination of layers: 1 layer of 6 mm; the 2nd layer 6 mm thick, 3-ply, 6 mm, 4-th layer 45 mm, 5-th layer 2 mm, 6-th layer 15 mm

For comparison, the properties of the developed body with similar took carbon fabric brand Ural-T-22 and glass fabric stamps TSF-(7a) - 7C mass ratio of 1 : 6.5, then carbon fabric Ural T - 22 impregnated binder which is a mixture of nitrogen-containing thermosetting phenolic resin in an organic solvent (acetone) with epoxygenase resin ED - 20 with the content accordingly 13-18 is ultracity in ethanol, dried for 15 s at 35-40oC. After that, he wound carbon fiber prepreg containing 50% by weight of the prepreg. Then impregnate glass fabric coated with benzosulfimide resin SFI -309 with a viscosity of 650oC720 MPa and was wound round wound carbon fiber prepreg. The total content of the resin is 5.2%.

Chemical resistance was evaluated according to GOST 12020-72, chemical resistance of plastics is estimated by the loss of mechanical properties of the samples before and after exposure of the samples in a hostile environment, %:

Good - 0 - 15

Satisfactory to 15.1 - 25

Bad - more than 25

Resistance in hot (90oC) water was determined by the loss of strength after exposure for 2 years.

Resistance in aggressive environments was determined by the loss of strength (%) after 2 years of exposure in plastification tub production of artificial fibers, which is a solution: 10-40 g/l of sulfuric acid, 10-20 g/l of zinc sulfate, 80-150 g/l of sodium sulfate; from 0.01 to 0.5 g/l surfactant; 0.05-0.1 mg/l of hydrogen sulfide and 0.1-0.6 g/l of carbon disulfide.

The leak was determined by pumping water under pressure up to 10 atmospheres in the internal cavity of the body with a shutter speed of 30 m is E.

From the above data it is seen that the invention significantly extends the capabilities of the product.

1. Multi-layered case that contains multiple layers of a mixture of a binder and a fibrous filler, taken in different ratios, the interior of which contains carbon cloth, and the outer - glass-fiber filler, and the intermediate layer, wherein the inner layer is formed by winding layers of guledani, impregnated with phenol-formaldehyde binder, an intermediate layer made of thermoplastic polymer, and the outer strength layer contains a glass fiber impregnated with epoxy resin Dianova type with a ratio of layer thicknesses from 1 : 1 : 1 - 45 mm to 6 : 6 : 10 - 45 mm the housing is further provided with a protective layer of thermoplastic polymer layers thermoregulation and heat and electric insulation, giving the body new operational properties.

2. The case under item 1, characterized in that the inner protective layer made of thermoplastic resin or heat-sealing wound film thickness of 1 to 10 mm to ensure the use of the product in hot and cold water supply.

3. Building on PP.1 and 2, characterized in that Emim modified binder, the thickness of 0.4 - 1.0 mm to ensure that the heat content of the body by passing an electric current.

4. Building on p. 3, characterized in that the outer protective layer of thermoregulation caused heat and electrical insulation in a layer thickness of 5 to 15 mm polyurethane foam.

 

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FIELD: technological processes.

SUBSTANCE: structure of invention is intended for industrial applications, such as panels for buildings or panels for internal lining of various transport means. Besides panels must be light, cheap, and have proper mechanical properties. These panels should better be produced by simple, efficient methods for improvement of process profitability and to use polymers in process of production. Flat structure consists of bound set of contacting meshes in the form of cells, having any cross section, and substantially parallel walls from one mesh to the other one. Besides walls of cells include at least two parts based on various polymer compositions, and connection between parts is substantially parallel to plane of structure. Walls of cells include at least three parts on the basis of at least two various polymer compositions, connection of which is substantially parallel to plane of structure. Walls of cells include central part of this composition and two end parts on the basis of the same composition, but differing from composition of central part. Method for structure making includes the following stages, when the following takes place: - at least two different polymer compositions are supplied in the first "ascending" slot extrusion head by means of joint extrusion unit, and using this extrusion head, flat sheet of polymer melt is produced, which contains two welded strips on the basis of compositions; and then - this sheet is transformed by means of the second "descending" extrusion head into three-dimensional profile, which produces structure after cooling. Device for method realisation comprises two extrusion heads: - the first "descending" slot extrusion head is arranged with the possibility to produce sheet, including two contacting or welded flat flows on the basis of two different melt polymer compositions; and - the second "descending" extrusion head is arranged with the possibility to transform sheet into three-dimensional profile, which after cooling produces structure.

EFFECT: creation of specific cellular structure.

10 cl, 5 dwg

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