Laminate polymeric tube made by centrifugal method

FIELD: laminate polymeric tubes made by centrifugal method.

SUBSTANCE: laminate polymeric tube includes outer layer, inner layer and at least one more layer arranged between said outer and inner layers. All layers contain cured resin. Resin of outer and inner layers is cured by action of visible light irradiation with wavelength 380 - 780 nm. Resin of outer layer may be cured by action of light irradiation of near IR-band of spectrum with wavelength 780 - 1200 nm. At least one of layers arranged between outer and inner layers includes glass fibers.

EFFECT: simplified process, lowered expenses for making laminate polymeric tubes, satisfied ecological standards.

7 cl

 

The present invention relates to fabricated by the centrifugal method of multilayer pipe. Fabricated by the centrifugal method of polymer pipes and the method of their manufacture are described, for example, in EP 360758 A2 and CH 684326 A5.

In DE 2109643 AND described a method of manufacturing a cylindrical hollow products, such as pipes, in a rotating manner in which the original materials, such as resin, serves for the formation of layers through the nozzles. Essentially the same method described in EP 0533482 A1.

For the formation or the formation of individual layers in a rotating matrix serves a variety of polymer (resin) of the mixture and/or fillers. The structure of the individual layers and their thickness depends on the specific purpose of the final product. Despite the exothermic nature of the curing process used resin system in order to accelerate the curing reaction and to improve performance it is necessary to apply heat. However, this may be the evaporation of monomers from the polymer mixture.

Although the above-described method of manufacturing pipes and manufactured in this way the pipes are not only well established in the field of sewer equipment, but also successfully compete, for example, ceramic or concrete pipes, there is a need to simplify the technology manufacturer is of such pipes, in reducing the possible accompanying such a process of environmental pollution and to reduce production costs.

To solve this task according to the invention serves at least partially abandon the above-described curing resin used under the influence of heat, but instead to use the resin, fotoatelier under the influence of light radiation with a certain wavelength.

The object of the invention is fabricated by the centrifugal method of multilayer pipe containing outer layer, inner layer and at least one layer located between the outer and inner layers, and all layers contain utverzhdennuyu resin. In accordance with the invention, the resin of the outer layer and the inner layer overiden under the influence of visible light radiation with a wavelength of 380-780 nm or light radiation near infrared spectral region with a wavelength of 780-1200 nm, and at least one of the layers located between the outer and inner layers, contains fiberglass.

As mentioned above, vodootvedenie resins may be under the influence of visible light or radiation in the near infrared region of the spectrum. If the curable layer is made of more or less pure polymer mixture (for example from polimerizuet the unsaturated compounds in combination with a polymerization initiator), it can be cured and light radiation with a wavelength of from 380 to 780 nm (visible light), and light radiation with a wavelength of from 780 to 1200 nm (near infrared radiation region of the spectrum).

In principle true rule, according to which the increase of the wavelength of optical radiation increases the depth of its penetration. It follows that exposure to visible light or radiation in the near infrared region of the spectrum can also be cured layers containing certain impurities, such as fillers, in particular calcium carbonate.

As to the outer layer of the pipe is presented a number of specific requirements (for example, with regard to mechanical strength, light resistance, hardness, homogeneity), in one of the embodiments of the invention from fotoallergiyami resin is proposed to perform the outer peripheral layer of the pipe. In the composition of the material of this layer can include fillers, the content of which in accordance with various embodiment of the invention may comprise less than 10 wt.%, accordingly, less than 5 wt.%, while in another embodiment, the outer peripheral layer of the pipe is proposed to run from the resin without added fillers. To simplify and accelerate vodootvedenie such layer can when it is run, for example, from polymerized is easymanage compounds in combination with the polymerization initiator.

The time required for the formation of the cured layer of a thickness of, for example, from 2 to 3 mm, less than 10 minutes At such a short duration of curing the evaporation of monomers, for example styrene, does not occur at all or occurs to a much lesser extent in comparison with the known from the prior art method. Simultaneously, higher productivity and reduced energy consumption (required, for example, to heat-curable liquid composition).

Almost immediately after the curing of one layer can be printed with the following layers or on the same technology (i.e. vodootvedenie used resins), or by known techniques (thermotherapies).

In the above-described technology of fotoallergiyami resin, it is advisable to perform internal "wrong" pipe layer, the material which in this case, as described above, if necessary, add small amounts of filler or not to add it. This achieves the same advantages discussed above in the description of the outer peripheral layer.

To perform the layers located between the inner and outer layers, you can use an ordinary polymer mixture, which utverjdayut (respectively which need to be cured under the influence of heat without fear in this SL is tea possible evaporation of monomers, which hinder performed in accordance with the invention already solidified outer and inner layers.

To irradiate the applied inside the matrix layers can in a simple way with the lamp attached to the tube through which the matrix is served raw materials, and move along with it. This lamp can be used, for example, a metal halide lamp.

Pipes manufactured for potable water, must have on their inner surface a coating that prevents anyone from getting into the drinking water of harmful substances. In accordance with the prior art for this purpose it is required to use certain pure resin (polyester resin), allowing them to work in contact with drinking water. However, for the curing of such resins is required to create a high initial temperature. Proposed in the invention, the solution provides in this respect to achieve certain advantages due to the execution of the inner layer of such pipes made of a material that can effectively be cured for a short time under the influence of light radiation.

As mentioned above, suitable for use provided by the invention purposes, the materials can be formed of the polymerized unsaturated compound in combination with the initiator floor is merisalo. As examples of the polymerized unsaturated compounds can be called one of the following resins: unsaturated polyester resin, a polymer of a vinyl ester resin obtained by polycondensation of a complex of the polyester with acrylic or methacrylic acid containing ethylene unsaturated groups of the polyurethane, the phosphorus-containing polymer of vinyl esters, etc. as an initiator of polymerization can be used, for example, an organic boron compound of the formula

in which R1, R2, R3and R4each independently of one another may denote optionally substituted alkyl, aryl, allyl, Uralkaliy, alkenylphenol or heterocyclic group, or a halogen atom, a Z+denotes a cation, such boron compound contains an acidic compound. This acid compound, in turn, may represent a latent acid-forming substance, which when exposed to light and/or by heat forming acid, for example, can be a organic sulfonate connection.

Although the maximum thickness vodootvedenija layer fabricated by the centrifugal method, the polymeric tube is typically of the order of 2-3 mm, however, this layer depending on the amount contained is it filler may have a greater thickness (up to 10 mm or even more). In General we have the following rule: the higher the degree of purity of the resin, the greater thickness can be made of it a layer capable of cure within a reasonable period of time solely under the influence of light. In parallel with vodootvedenie possible to use other methods of curing, for example by using peroxide.

Proposed in the invention, the pipe has at least one Vodootvodny resin layer, i.e. its structure may be two or more photoallergen layers. These layers can be directly border each other or may be separated from each other by intermediate layers. The remaining layers of the pipe in its structure and composition of their material can match known from the prior art. For example, some of these layers may contain more or less high amount of fiber, while other layers may contain fillers of different nature and, in turn, can be separated from each other by layers made of resin, or a layer made of sand-resin mixtures.

Another advantage of fototerapia is that it is the irradiation of light outer layer starts from the surface, whereas according to the prior art curing begin only after applying some of the layers by exposure to heat, and in this case, the curing process is gradually expanding from the inside out. Such differences also caused a significant reduction in the duration of fototerapia compared with thermotherapies.

1. Fabricated by the centrifugal method of multilayer pipe containing outer layer, inner layer and at least one layer located between the outer and inner layers, and all layers contain utverzhdennuyu resin, wherein the resin of the outer layer and the inner layer overiden under the influence of visible light radiation with a wavelength of 380-780 nm or light radiation near infrared spectral region with a wavelength of 780-1200 nm, and at least one of the layers located between the outer and inner layers, contains fiberglass.

2. Polymer pipe according to claim 1, characterized in that it vatreni layer, the outer layer or both layers contain less than 10 wt.% the filler.

3. Polymer pipe according to claim 1, characterized in that its inner layer, the outer layer or both layers contain less than 5 wt.% the filler.

4. Polymer pipe according to claim 1, characterized in that its inner layer, the outer layer or both layers do not contain fillers.

5. Polymer pipe according to claim 1, characterized in that the resin is formed polimerizuet unsaturated connection is using in combination with the polymerization initiator.

6. Polymer pipe according to claim 1, characterized in that the thickness of the cured under the influence of light radiation of the resin layer is less than 4 mm

7. Polymer pipe according to claim 1, characterized in that the thickness of the cured under the influence of light radiation of the resin layer is less than 2 mm.



 

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The invention relates to molding technology polymer products for centrifugal and can be used for the manufacture of bearings

The invention relates to the manufacture of plastic pipes by centrifugal casting, and is intended for the manufacture of pipes with fiber and sand fillers

The invention relates to methods and devices for centrifugal molding the polymeric compositions and may find application in mechanical engineering, plastics industry and other industries

The invention relates to a device that provides rotational molding of hollow plastic products, mainly PVC plastisols, and can be used in industry for the processing of plastics, in particular for the production of toys from polyvinyl chloride (PVC) plastisols

The invention relates to a device for centrifugal molding and the molding of thin-walled articles from powdered thermoplastic polymers in hollow form on the heated molding surfaces form

The invention relates to a multicolor molding thermoplastic membranes, and more specifically to door panels of cars that are formed in the form of a plastic shell containing the front part of the side edge part and a bent part, and tooling for the manufacture of the mentioned plastic shells

The invention relates to technological processes, in particular to a device for the centrifugal molding of the coating of the plastic hollow products, mainly large, for example, insulating coatings, and can be used in electrical and other industries

FIELD: molding polymer articles by centrifugal method; manufacture of sliding bearings.

SUBSTANCE: proposed method includes loading the polymer composition in form of binder and anti-friction fillers in metal bush followed by molding the anti-friction coat at rotation of metal bush for forming the layers of fillers in thickness of anti-friction coat by means of segregation. Filler of boundary layer is additionally introduced into polymer composition in form of coarse-dispersed metal powder at thermal expansion coefficient exceeding that of metal bush and specific gravity exceeding that of anti-friction fillers. Prior to segregation of anti-friction fillers, temperature and speed modes are set for forming the boundary layer from metal powder between metal bush and anti-friction coat. Use is made of bronze powder for aluminum bush; steel powder is used for bronze bush and powder of eutectic melt, nickel and iron for example is used for steel bush. Additional introduction of coarse-dispersed metal powder into polymer composition of boundary layer filler makes it possible to form structure of matrix as compacted porous layer of metal powder with polymer binder (pseudo-metal layer) since its thermal expansion coefficient exceeds that of metal bush, thus enhancing strength of adhesion of anti-friction coat with metal bush at temperature fluctuations both during manufacture and in the course of operation of bearing due to smoothing-out the difference in change of linear sizes of metal and polymer by pseudo-metal layer.

EFFECT: enhanced durability of bearing.

2 cl, 2 dwg

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