IT8202929A1

IT8202929A1 - PROCEDURE TO INCREASE THE OPTIMIZATION OF THE PERFORMANCE OF ANTI-CORROSION COATINGS FOR (PARTICULARLY CYLINDRICAL OR TUBULAR METAL PARTS) AND COATINGS PRODUCED WITH THIS PROCESS

Info

Publication number: IT8202929A1
Application number: IT1982A02929A
Authority: IT
Original assignee: Neri Eberle
Priority date: 1982-10-11
Filing date: 1982-10-11
Publication date: 1984-04-11

Description

DE S C R I Z I O N E D E L L ' I N V E N Z I O N E TITOLO DE S C R I Z I O N E D E L I N V E N Z I O N E TITLE

"" PROCEDIMENTO PER INCREMENTARE L'OTTIMIZZAZIONE DELLE PRE-' STAZIONI DEI RIVESTIMENTI ANTICORROSIONE PER PEZZI METALLICI "" PROCEDURE TO INCREASE THE OPTIMIZATION OF THE PRE-STATIONS OF ANTI-CORROSION COATINGS FOR METALLIC PARTS

(PARTICOLARMENTE CILINDRICI O TUBOLARI) E RIVESTIMENTI PRODOTTI CON TALE PROCEDIMENTO "" (PARTICULARLY CYLINDRICAL OR TUBULAR) AND COATINGS PRODUCED WITH THIS PROCEDURE ""

RIASSUNTO SUMMARY

La presente invenzione riguarda tua procedimento -per increl?ottimizzazione_ tei complesse delle prestazioni di un rivestimento. anticorrosione_ per pezzi metallici (particelarmeil? te cilindrici e tutelari) fabbricandolo mediante la fusione aut cessiva ti distinte polveri ti resina rispetto al camplesso ottenibile cen l'applicaziene ti una sola polvere_ ed i rivestimer ti fabbrioati cen tale .procedimento. The present invention relates to your process for complex optimization of the performance of a coating. anticorrosion for metal parts (cylindrical and protective particles) by manufacturing it by self-melting distinct resin powders with respect to the sample obtainable with a single powder application and the fabricated coatings with such process.

STATO ATTUALE DELLA TECNICA CURRENT STATE OF THE TECHNIQUE

_ Un rivestimento _anticorrosione per la superficie esterna e/e interna ti pezzi metallici ( particolarmente cilindrici e tubolari) installati in amBiente aggressive (interrati et immersi) e/e rispettivamente a contatto di fluido corrosivo e che persegue le scopo isolante la superficie stessa dell' ambiente detto viene normalmente fabbricato con Impiego di idrocarburi solidi a temperatura ambiente (Bitume e catrame) eppure resine (te moplastiche e/e termoindurenti) : infatti per l' efficienza del rivestimento sono richiesti valori elevati delle^seguenti prestazioni: _An anticorrosion coating for the external and / and internal surface of the metal pieces (particularly cylindrical and tubular) installed in aggressive environments (underground and immersed) and / and respectively in contact with corrosive fluid and which pursues the purpose of insulating the surface of the said environment is normally manufactured with the use of solid hydrocarbons at room temperature (bitumen and tar) and yet resins (thermoplastic and / and thermosetting materials): in fact, high values of the following performances are required for the efficiency of the coating:

- inerzia _chimica rispetta ai componenti l ? ambiente esterna ; - Impermeabilit?; _ - chemical inertia respects the components l? external environment; - Waterproofness; _

- resistenza alla penetrazione; - resistance to penetration;

- resistenza a compressione; - compressive strength;

- resistenza all'urta; - impact resistance;

- bassa fragilit? alle temperature minime; _ - low fragility at minimum temperatures; _

bassa, plasticit? alle temperature pi? elevate ; low, plasticity? at the most? elevated;

- dielettricit?; - dielectricity;

- resistenza ai raggi ultravioletti; - resistance to ultraviolet rays;

- adesione alla superficie metallica; - adhesion to the metal surface;

- inalterabilit? delle prestaziani nel tenne . - inalterability of the prestaziani in the held.

Poich? il rivestimento per la superficie esterna attenuta can bitume o catrame avrebbe limitate prestazioni per i normali casi di impiego di tubi metallici, si provvede a migliorare la _sua efficienza modificando le caratteristiche del bitume a catrame stessi con artifici, quali: Since? the coating for the attenuated external surface in bitumen or tar would have limited performance for the normal cases of use of metal pipes, its efficiency is improved by modifying the characteristics of the tar bitumen with artifices, such as:

- interporre un adesiva fra il rivestimento e^la superficie me-? tallica onde garantire odesiene ed assenza di vuoti rivestiment o / superficie; _ _ - interpose an adhesive between the coating and the surface me-? heel in order to guarantee the presence and absence of empty coating / surface; _ _

miscelare il materiale base con polveri che ne aumentino la resistenza a penetrazione ; _ mix the base material with powders that increase its resistance to penetration; _

- inglobare fibre a nastri di fibre nella spessore del rivesti mento per ridurre, le scorrimento a compressione. - incorporating fibers into ribbons of fibers in the thickness of the coating to reduce creep under compression.

Per il caso di rivestimento fabbricata, mediante fusiane polvere di_resina il vaiare attenute per le singole prestazionidipende sia_dalla temperatura che dal tempo di permanenza (cio?: dal ciclo. termico) della resina durante la_fabbricaziene del. rivestimento , altre che ovviamante-dal tipo-e dalle caratteristir-. che della resina stessa. Accade cio? che l' esaltazione di una propri et? (es.: aderenza) .attenuta- con opportuna ciclo termica di fabbricaziene, contemporaneamente comporta riduzione di una altra (es.: dielettricit?) : da ci? deriva che la fabbricaziene ; di un rivestimento valida .obbliga a . fare un compromesso fra i valari. delle prestazioni che sarebbera attenibili singolarmente. In sostanza l'ottimizzazione dei valori della propriet? del rivestimento fabbricata con un unica resina non pu? essere fatta sui massimi -che si possono., attenere.. singolarmente con speci-? fica ciclo termica. La necessit? di contemperare reciprocali ente i valori delle prestazioni comporta limitazioni anche. ril vanti sull ' efficienza del rivestimento . For the case of coating manufactured by means of resin powder, the variation required for the individual performances depends both on the temperature and on the residence time (that is, on the thermal cycle) of the resin during the manufacture of the resin. coating, others that obviously-from the type-and from the characteristics-. than the resin itself. What happens? that the exaltation of one's own age? (eg: adherence) .attention - with an appropriate thermal cycle of manufacturing, at the same time it involves a reduction of another (eg: dielectricity): from this? it follows that the fabrication; of a valid coating. make a compromise between the valari. of the performances that would be attenuable individually. Basically, the optimization of the values of the property? of the coating manufactured with a single resin can not? be done on the maximums -which can be., to comply .. individually with speci-? thermal cycle fica. The necessity? to reconcile the values of performance with each other also entails limitations. relevant to the efficiency of the coating.

TESTO DELL' INVENZIONE TEXT OF THE INVENTION

La presente invenzione riguarda un procedimento atta ad increa catare l'ottimizzazione delle prestazioni dei rivestimen-? ti in resine (termoplastiche e/a termoindurenti ) fabbricati mediante_ fusione di polveri, per pezzi metallici (particolarmente cilindrici e tubolari) ed i rivestimenti fabbricati con ta -le procedimento. The present invention relates to a process designed to increase the optimization of the performance of the coatings. resins (thermoplastic and / or thermosetting) manufactured by means of the fusion of powders, for metallic pieces (particularly cylindrical and tubular) and the coatings manufactured with this process.

Il procedimento consiste nel comporre il. rivestimento con . o pi? strati sovrapposti ciascuno dei quali ottenuto con pol.-vere di resina adatta a dare - con il ciclo termica_previsto -al -rivestimento stesso. in misura_elevata_le singole propriet? richieste? The procedure consists in composing the. coating with. or more? superimposed layers, each of which obtained with polymers of resin suitable to give - with the expected thermal cycle - to the coating itself. to a high_ extent_the individual properties? requests?

in altre parole, anzich? adottare un ciclo termico atto ad. ottenere un rivestimento con prestazioni mediamente contemperate a ciascuna massima ottenibile con la stessa unica resina e cielo teraioo opportuno, ai scelgono le resine e/o le loro caratteristiche in modo che con il ciclo termico relativo ai abbia a realizzare un_rivestimento_che presentarmi complesso_di prestazioni . ad_ ottimizzazione- incrementata. in other words, instead? adopt a thermal cycle suitable for. to obtain a coating with performances on average balanced to each maximum obtainable with the same single resin and suitable thermal top, they choose the resins and / or their characteristics so that with the relative thermal cycle it has to realize a coating which presents a complex of performances. ad_ optimization- increased.

In definitiva il contenuto innovativo del procedimento consiste essenzialmente nel fatto che l' ottimizzazione delle prestazieni _del_rivestimento risulta aumentata _e_ diviene indipendente dalle, limitazioni reciproche che. derivano dalla fabbrica-^ zione con 1 ,impiege_di_.un 'unica polvere di resinale dalla unicit? e contemporaneit? dei valori dei parametri scelti per il cicle produttivo. Ultimately, the innovative content of the process essentially consists in the fact that the optimization of the performance of the coating is increased and becomes independent of the reciprocal limitations. derive from the manufacture with 1, using a single resin powder with uniqueness? and contemporaneity? the values of the parameters chosen for the production cycle.

Per quanto riguarda i rivestimenti fabbricabili con tale precedimento in particolare , ma senza alcuna implicazione restrittiva, l ' invenzione ? valida per il rivestimento ottenibile con diverse polveri di polietilene ciascuna avente propri indice di fusione" e "densit?'' in modo che le propriet? di ogni __ strato componente risultine con valori ad ottimizzazione incre As for coatings that can be manufactured with this precedence in particular, but without any restrictive implication, the invention? valid for the coating obtainable with different polyethylene powders each having its own melting index "and" density '' so that the properties? of each __ component layer results with incrementally optimized values

Claims

a - Manufacturing process by means of powder melting - designed to increase the optimization of the performance of resin coatings (thermoplastic and / or thermosetting) for metal pieces (particularly cylindrical tubular? b - Process according to claim "a", characterized by the fact of consisting in composing the coating with fusion, of two or more overlapping layers, each of which obtained with specific resin powder to give - with the common thermal cycle - to the coating itself to a high degree the individual properties required. _ c - Process according to claim "a" characterized by the fact of being based on the criterion of choosing the resins and / or their relative characteristics so that with the common thermal cycle the optimization of the performance of the manufactured coating is increased ,

d - Process according to the claim in "a", characterized by the fact that the optimization of the performance of the coating becomes independent of the reciprocal limitations deriving from the manufacture with the use of a single resin powder and the uniqueness of the values of the parameters chosen for the production cycle.

e - Process according to claim "a", characterized in that the casting of the resin powder? obtained by preheating the metal patches and / and subsequent reheating. _

f - Coating in thermoplastic and / or thermosetting resin et-? held by fusion with pi? powders of the same resin but having different characteristics or, with. dust. of different resins: each coating obtained will possess? ownership with increased optimization and with values, comparable to the maximum ones that can be reached individually with a single resin subjected to distinct thermal cycles of manufacture. bricaziene suitable for the enhancement of a property? at a time.

Coating according to claim "f", characterized in that it is obtained with two or more? polyethylene powders each having its own melting index, density, filler and pigmentation.

h Covering according to the claims in "f" and characterized by the fact of having for main use the practice from the carr? siane of the external surface and / in the interior of metal pipes

i - Coating according to the claims in "f" and "g '', characterized by the fact that the thickness can be varied according to the nature of the component resin and the performance required by the use of the coated pipe. l Coating according to the claims in "f" and "g", _ characterized by the_fact-that_f-singals - layers - camps - pass through. g ", characterized by the fact that it can incorporate pigments. fillers, ribbons in order to further increase performance

n - Process according to claim "a" substantially as described and illustrated - for the specified purposes and coatings, carried out with this process. _