CS212913B1 - Tube resisting the action of aggressive medium and method of making the same - Google Patents

Description

The invention relates to an oven resistant to aggressive environments, consisting of two layers, one of which is made of fiberglass with glass or synthetic fibers; the invention also relates to a method of manufacturing such an oven.

Up to now, only stoneware pipes can be used for the removal of aggressive substances, in particular liquids, by piping which is also stored in an aggressive environment. However, their size is limited for technological reasons and their production also requires a relatively large amount of energy. Smaller pipes having a smaller diameter can be made for this purpose from some kinds of pure plastic materials whose mechanical strength is low and insufficient for most practical applications. Therefore, the applicability of tubes of these materials is considerably limited.

The hitherto known larger diameter tubes made of plastics are made of resins and reinforced with glass reinforcement wrapped around the core or around the mold during manufacture. These pipes are used for a variety of purposes, for example, to protect antenna systems on TV masts, to store loose materials, etc. Such pipes, however, are not resistant to obrueu when used to guide liquids with hard admixed particles and are not very resistant against mechanical stress.

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The drawbacks of these prior art pipes are largely overcome by an aggressive and abrasion-resistant oven according to the invention, the essence of which is that one layer consists of plaet concrete reinforced with scattered fiber reinforcement, in particular aabestos, and its perimeter is wrapped with organized reinforcement behind glass or synthetic fibers bonded with a synthetic resin of the same type as the plaster concrete binder.

The principle of the method for producing an oven according to the invention is that in or after the formation of the core layer of plaat concrete and in the course of polymerization or polycondensation or polyadioe the bonding plaat concrete core layer forms an outer sheath layer of fiber reinforced laminate.

The oven according to the invention has, in addition to high resistance to aggressive substances transported inside the oven or surrounding the outer perimeter of the oven, also high load-bearing capacity and resistance to external and internal overpressure as well as to other kinds of mechanical stress; its surface is resistant to the hoop caused by the movement of hard particles within the pipe formed from the pipes of the invention. The coherence of the binder in both the core and the sheath ensures a perfect bonding of both layers with the boundary bonds and their interaction under load. A good co-operation of both layers is the deposition of the outer laminate layer during the polymerization or polycondensation or polyaddition, depending on the type of binder used.

A specific embodiment of an oven according to the invention is given in the following example, which shows an exemplary material composition of the individual layers of the oven and also an exemplary process for its production.

The core core is formed on a core core mold of a fresh plastic concrete mixture containing 90 parts by weight of gravel sand of suitable granulometry, 8 parts by weight of microfibrous asbestos, 10 parts by weight of polyester resin, 3-4 parts by weight of initiator (according to the resin manufacturer) , and 0.5 to 1.5 parts by weight of the accelerator (also according to the resin manufacturer's specifications). The mold has a vertical axis and, on its outer side, it forms a core layer of 2 to 5 µm thickness based on the diameter of the oven from this fresh plaat concrete mix.

After 30 to 120 min. curing according to (environmental conditions, removal of the outer mold and immediate winding of the formed core door with glass fibers, bonded and protected resin of the same type as the core door resin, the fiber to binder ratio being 1 * 0.7). 120 min depending on the ambient conditions and remove the inner mold and the oven can be transported.

Claims (2)

SUBJECT OF THE INVENTION An oven resistant to aggressive environments, comprising a core layer and a sheath layer surrounding the core layer and formed of a fiberglass or synthetic fiber laminate, characterized in that the core layer consists of a plastic concrete reinforced with a scattered reinforcement of fibers, in particular aabestos, and the outer periphery of the core layer is wrapped with an organized glass or synthetic fiber reinforcement bonded with a synthetic resin of the same type as the core layer binder. 2. A method according to claim 1, characterized in that the outer sheath layer is deposited on the inner core layer during the polymerization or polycondensation or polyaddition of the binder core reinforced by the scattered reinforcement.