DK171939B1

DK171939B1 - Composition for coating, proofing, sealing and protecting, comprising an isocyanate-curable polymer and an elastomer, a process for producing the composition, and a process for applying the composition

Info

Publication number: DK171939B1
Application number: DK037987A
Authority: DK
Inventors: Rolf Lennart Ek; Sune Bertil Nygren
Original assignee: Ind Property Of Scandinavia Ab
Priority date: 1985-05-24
Filing date: 1987-01-23
Publication date: 1997-08-18
Also published as: DK37987A; FI82067B; FI82067C; HU204867B; HUT42793A; DE3662908D1; IN167489B; FI870337A0; FI870337A; DK37987D0

Description

DK 171939 B1 iDK 171939 B1 i

Den foreliggende opfindelse angår en komposition til overtrækning, tætning, forsegling og beskyttelse samt en fremgangsmåde til fremstilling og anvendelse af en sådan komposition.The present invention relates to a composition for coating, sealing, sealing and protecting as well as to a process for making and using such a composition.

5 Formålet med den foreliggende opfindelse er at tilvejebringe en komposition, der kan anvendes som overtræksmateriale for overflader, som er udsat for korrosion og mekaniske angreb, som en tætnings eller fyldmasse for rørforbindelser indeholdende vand eller andre væsker, samt 10 tagbelægning, punktforsegling af keramiske sten, metalplader og lignende, hvilken komposition er meget bestandig over for mekanisk slid og angreb fra kemikalier, herunder vand.The object of the present invention is to provide a composition which can be used as a coating material for surfaces subjected to corrosion and mechanical attack, such as a seal or filler for pipe connections containing water or other liquids, as well as roofing, point sealing of ceramic stones , sheet metal and the like, which is highly resistant to mechanical abrasion and attack by chemicals, including water.

I SE offentliggørelsesskrift nr. 399.915 beskrives et 15 korrosionsbestandigt overtræksmateriale, især til beskyttelse mod ydre rustangreb på automobilchassier, hvilken komposition består af en polyurethanpolymer, affald af gummi, vandfri kultjære og zeolit som tørringsmiddel. Denne komposition opfylder generelt sit formål, men har 20 nogle ulemper ved at lugte kraftigt af sort kultjære, hvilket forhindrer dens anvendelse i lukkede rum, samtidigt med at der kræves kraftig udluftning under anvendelsen. Endvidere har sort kultjære den ulempe, at de dannede overtræk har en sort farve, hvilket normalt er uden 25 reel betydning, men ofte ikke bliver accepteret, idet man ofte kræver et pigmenteret produkt af en ønsket farve. Udover disse ulemper, som er af en vis kosmetisk natur, kræves ofte en endnu højere slidstyrke, bestandighed over for kemiske angreb, især i alkalisk miljø, og tempera-30 turstabilitet.SE Publication No. 399,915 describes a corrosion-resistant coating material, particularly for protection against external rust attacks on automobile chassis, which consists of a polyurethane polymer, rubber waste, anhydrous coal tar and zeolite as a drying agent. This composition generally fulfills its purpose, but has some disadvantages of smelling strongly of black coal tar, which prevents its use in confined spaces, while requiring heavy ventilation during use. Furthermore, black coal tar has the disadvantage that the coatings formed have a black color, which is usually of no real importance but is often not accepted, often requiring a pigmented product of a desired color. In addition to these disadvantages, which are of a certain cosmetic nature, even higher abrasion resistance, resistance to chemical attack, especially in alkaline environment, and temperature stability are often required.

Det har nu ifølge opfindelsen overraskende vist sig muligt at overvinde disse problemer ved at anvende en komposition, der er ejendommelig ved, at den består af et 2 DK 171939 B1 elastomert materiale eller en gummi med en partikelstørrelse på højst 0,4 mm i en mængde på 20 - 50 vægt-%, en isocyanathærdelig polymerbase i en mængde på 40 - 55 vægt-%, et polymer-hærdende isocyanat i en mængde på 18 -5 30 vægt-% og en alifatisk polyether-glycol i en mængde på 1-5 vægt-%, og eventuelt yderligere indeholder et far-vepigment, et tørringsmiddel af zeolittypen, et aktivt aluminiumoxid og/eller et aluminiumsilicat.It has now surprisingly been found, according to the invention, to overcome these problems by using a composition characterized in that it consists of an elastomeric material or a rubber having a particle size of not more than 0.4 mm in an amount 20 to 50% by weight, an isocyanate curable polymer base in an amount of 40-55% by weight, a polymer curing isocyanate in an amount of 18-5% by weight, and an aliphatic polyether glycol in an amount of 1- 5% by weight, and optionally further containing a color pigment, a zeolite-type desiccant, an active alumina and / or an aluminum silicate.

Hensigtsmæssige udførelsesformer for den omhandlede kom-10 position er genstand for flere uselvstændige krav.Suitable embodiments of the present composition are subject to several independent claims.

Det hærdelige forpolymerisat er fortrinsvis en isocyanat-hærdeligt polyurethan (DESMODUR®-hærder; DESMOPHEN® 1150-forpolymerisat) men også isocyanat-hærdelige epoxy-polymere kan anvendes.The curable prepolymer is preferably an isocyanate curable polyurethane (DESMODUR® hardener; DESMOPHEN® 1150 prepolymer) but isocyanate curable epoxy polymers can also be used.

15 Egnede bindemidler af polymer-typen, som er hærdelige med isocyanat-aktive hærdere, er forskellige polyoler, polyester-baser med en molekylvægt på 200 og derover. Andre polymere materialer er epoxyharpikser, som fortrinsvis er opløst i en keton eller en glycolether og derefter hærdes 20 ved hjælp af en isocyanat-aktiv hærder (f.eks. DESMODUR®) eller en aminogruppe-aktiv hærder. Egnede epoxyharpikser har en molekylvægt på 1000 eller derover.Suitable polymer-type binders which are curable with isocyanate-active hardeners are various polyols, polyester bases having a molecular weight of 200 and above. Other polymeric materials are epoxy resins which are preferably dissolved in a ketone or a glycol ether and then cured by an isocyanate-active hardener (e.g. DESMODUR®) or an amino group-active hardener. Suitable epoxy resins have a molecular weight of 1000 or more.

De anvendte polyoler kan være polyestre, såsom DESMOPHEN® 1150 og/eller en alifatisk glycol, såsom ethylenglycol, 25 diethylenglycol eller triethylenglycol.The polyols used may be polyesters such as DESMOPHEN® 1150 and / or an aliphatic glycol such as ethylene glycol, diethylene glycol or triethylene glycol.

Alle typer gummier kan anvendes som elastomert materiale, såsom affaldsgummi, affald fra automobildæk, kautsjuk og andre gummikvaliteter.All types of rubber can be used as elastomeric material, such as waste rubber, waste from automobile tires, rubber and other rubber grades.

Det har således vist sig, at 20 - 40 vægt-% af et gummi-30 pulver, hensigtsmæssigt affaldsgummi, med en partikelstørrelse på mindre end 0,4 mm, fortrinsvis 0,05 - 0,2 3 DK 171939 B1 mm, 40 - 50 vægt-% af en polymerbase, 1-5 vægt-% af en alifatisk polyether-glycol-base, og 18 - 25 vægt-% af en isocyanat-hærder, giver udmærkede produkter. De omhandlede kompositioner har i hærdet tilstand en meget høj elas-5 ticitet og slidstyrke. I tilfælde af at polyesterbasen indeholder fugtighed bør et tørremiddel, såsom en zeolit, tilsættes, eller i stedet kan tilsættes aktiv aluminiumoxid eller basiske aluminumsilicater.Thus, it has been found that 20 to 40% by weight of a rubber powder, suitably waste rubber, having a particle size of less than 0.4 mm, preferably 0.05 - 0.2 3 B1 mm, 40 - 50% by weight of a polymer base, 1-5% by weight of an aliphatic polyether glycol base, and 18-25% by weight of an isocyanate hardener, provide excellent products. The compositions of this invention have a very high elasticity and abrasion resistance when cured. In the event that the polyester base contains moisture, a desiccant such as a zeolite should be added, or active alumina or basic aluminosilicates may be added instead.

Opfindelsen skal i det efterfølgende illustreres nærmere 10 ved hjælp af nogle eksempler.The invention will hereinafter be illustrated in greater detail by some examples.

Eksempel 1 40 Vægtdele affaldsgummi med en partikelstørrelse på 0,1 - 0,2 mm blev intimt blandet med en blanding af 40 vægtdele DESMOPHEN® 1150 og 2 vægtdele polyether-glycol 15 (triethylenglycol). Til denne blanding sattes derefter 18 vægt-% af en isocyanat-aktiv hærder (DESMODUR®) til hærdning af de polymere. Den fremstillede komposition anvendtes til fremstilling af forskellige prøveovertræk fra testning.Example 1 40 parts by weight of waste rubber having a particle size of 0.1 - 0.2 mm were intimately mixed with a mixture of 40 parts by weight of DESMOPHEN® 1150 and 2 parts by weight of polyether-glycol 15 (triethylene glycol). To this mixture was then added 18% by weight of an isocyanate-active hardener (DESMODUR®) to cure the polymers. The composition prepared was used to prepare various test coatings from testing.

20 Det i eksempel 1 ovenfor fremstillede produkt (A) blev testet og sammenlignet med et produkt (B), fremstillet ifølge eksemplet i SE offentliggørelsesskrift nr. 399.915, med henblik på slidstyrke, varmebestandighed, vedhæftning til stål og kemisk bestandighed.The product (A) of Example 1 above was tested and compared to a product (B) made according to the example of SE Publication No. 399,915 for wear resistance, heat resistance, adhesion to steel and chemical resistance.

25 Slidstyrke25 Durability

Plader med påført overtræk af det ovennævnte middel blev behandlet i en tumbler i 5 dage (120 timer) sammen med 200 g sten. Rumfanget af materialet, som blev slidt af, angivet i mm , blev derefter målt.Plates with coated coating of the above agent were treated in a tumbler for 5 days (120 hours) together with 200 g of stone. The volume of the material which was worn off, expressed in mm, was then measured.

30 A = 19 mm^ DK 171939 B1 4 B = 105 mm^30 A = 19 mm ^ DK 171939 B1 4 B = 105 mm ^

Cylindriske testlegemer af de respektive produkter blev 9 presset mod et smergelklæde med 60 partikler pr. cm med tryk på 5N og en længde på 20 m, hvorefter det afslidte 5 rumfang blev bestemt.Cylindrical test bodies of the respective products were pressed against an umbrella with 60 particles per minute. cm with pressure of 5N and a length of 20 m, after which the worn 5 volumes were determined.

A = 145 mm·* B = 470 mm^A = 145 mm · B = 470 mm ^

VarmebestandiahedVarmebestandiahed

Plader med påført overtræk blev hængt lodret i 2 dage (48 10 timer) ved forskellige temperaturer, prøverne/pladerne blev derefter akklimatiseret ved stuetemperatur (20 °C) og derefter iagttaget visuelt.Applied coating plates were suspended vertically for 2 days (48 hours) at various temperatures, the samples / plates were then acclimated at room temperature (20 ° C) and then visually observed.

A = modstår 150 °CA = withstands 150 ° C

B = modstår 80 °CB = withstands 80 ° C

15 Vedhæftning til stål15 Attachment to steel

Overtræk på stål blev testet for aftrækning til bestemmelse af vedhæftningsevnen.Coatings on steel were tested for extraction to determine the adhesiveness.

A = modstår 4,0 mPa forud før vedhæftningssvigt B = modstår 0,8 mPa forud før vedhæftningssvigt.A = withstands 4.0 mPa prior to attachment failure B = withstands 0.8 mPa prior to attachment failure.

20 Kemisk bestandiahedChemical resistance

Prøveovertræk af de respektive produkter blev påvirket med forskellige olier, hvorved det generelt kunne bestemmes, at prøve B misfarvede alle væsker, medens prøve A ikke gav nogen misfarvning. Ved testning i surt vandigt 25 miljø (HCL 30%, HNO3 10%, H2SO4 10% eller CH3COOH 50%) 5 DK 171939 B1 var bestandigheden netop den samme. I alkalisk vandigt miljø (NaOH eller NH4OH) var prøve A den bedste.Sample coatings of the respective products were affected with different oils, thereby generally determining that Sample B discolored all liquids, while Sample A did not discolor. When tested in acidic aqueous environment (HCL 30%, HNO3 10%, H2SO4 10% or CH3COOH 50%) the resistance was exactly the same. In alkaline aqueous environment (NaOH or NH 4 OH), sample A was the best.

Vanddamppermeabiliteten er mindre for prøve A end for prøve B.The water vapor permeability is less for Sample A than for Sample B.

5 Anvendelse5 Application

Prøve A kan påføres i et tykkere lag (2,5 - 3 mm) på lodret hængende prøveplader i sammenligning med prøve B, som kun tillader 1,5 mm.Sample A can be applied in a thicker layer (2.5 - 3 mm) on vertically hanging specimens compared to Sample B, which allows only 1.5 mm.

I forbindelse med fremstillingen af den omhandlede kompo-10 sition kan produktet fortrinsvis holdes under vakuum, hvorved især slidstyrken og den kemiske bestandighed blive yderligere forbedret. Endvidere bliver ældningsbestan-digheden, fugtighedsbestandigheden og trækstyrken forbedret. Trykket under evakuering til eliminering af luft bør 15 være 0,8 bar, men kan i tilfælde af meget højviskose kompositioner reduceres til 0,5 - 0,6 bar. Anvendelsen af kompositionen kan ske på forskellige måder, såsom ved simpel manuel påføring, ved maskinel maling, samt ved hjælp af højtrykspåsprøjtning. Ved højtrykssprøjtemaling 20 kan hensigtsmæssigt anvendes et modificeret konventionelt højtryksforstøvningsapparat af to-komponent-typen, hvor kompositionen, fri for hærder, og hærderen bringes sammen forud for udløbet gennem et blandingsrør (blander) og føres fremad til en sprøjtepistol gennem en armeret høj-25 tryksslange. Trykket påkompositionen skal være så højt, at en godt blandet sprøjtemasse opnås (atomiseres), som ved kompositionens normale viskositet opnås ved 160 - 200 kg/cm og en temperatur på over 40 °C, fortrinsvis 40 -80 °C, især fortrinsvis 45 - 60 °C.In the preparation of the composition according to the invention, the product can preferably be kept under vacuum, thereby particularly improving the wear resistance and chemical resistance. Furthermore, the aging resistance, moisture resistance and tensile strength are improved. The pressure during evacuation to eliminate air should be 0.8 bar, but in the case of very high viscous compositions, can be reduced to 0.5 - 0.6 bar. The composition can be used in various ways, such as by simple manual application, by mechanical painting, as well as by high-pressure spraying. Conveniently, in high-pressure spray paint 20, a modified two-component conventional high-pressure atomizer, where the composition, is free of hardener, and the hardener is brought together prior to expiration through a mixing tube (mixer) and advanced to a spray gun through a reinforced high-pressure hose. . The pressure on the composition must be so high that a well-mixed spray mass is obtained (atomized), which at the normal viscosity of the composition is obtained at 160 - 200 kg / cm and a temperature above 40 ° C, preferably 40 - 80 ° C, especially preferably 45 - 60 ° C.

30 Normalt er viskositeten af kompositionen en sådan, at højtrykspumpen i sig selv ikke er i stand til at trække kompositionen op i apparatet ved normal temperatur. Der 6 DK 171939 B1 for er der med held anbragt en trykplade i forbindelse med højtrykssprøjteapparatet, hvilken plade passer nøje ind i kammeret, hvor kompositionen fremstilles, hvorefter trykpladen presses ned i beholderen, enten mekanisk, 5 pneumatisk eller hydraulisk, således at kompositionen presses ind i højtrykssprøjteapparatet.Normally, the viscosity of the composition is such that the high pressure pump itself is unable to pull the composition up into the apparatus at normal temperature. A pressure plate is successfully placed in connection with the high pressure spraying apparatus, which plate fits closely into the chamber where the composition is prepared, after which the pressure plate is pressed down into the container, either mechanically, pneumatically or hydraulically, so that the composition is pressed into in the high pressure sprayer.

For at forøge hærdningen af kompositionen kan tilsættes en accelerator til reaktionsblandingen i en mængde på 0,1 - 0,5 vægt-%. Eksempler på sådanne acceleratorer er di-10 butylditindilaurat eller en tilsvarende blyforbindelse.To increase the cure of the composition, an accelerator can be added to the reaction mixture in an amount of 0.1 - 0.5% by weight. Examples of such accelerators are dibutylditin dilaurate or a similar lead compound.

For at mindske risikoen for antændelse kan der tilsættes et flamme-hæmmende stof til kompositionen, såsom en phosphitforbindelse, der tilsættes i en mængde på 5 - 15 vægt-%. Et eksempel på et sådant stof er Nowgard V-4.To reduce the risk of ignition, a flame retardant may be added to the composition, such as a phosphite compound added in an amount of 5-15% by weight. An example of such a substance is Nowgard V-4.

15 Kompositionen kan også gøres thixotrop ved tilsætning af passende gelatinerings-stoffer.The composition may also be made thixotropic by the addition of suitable gelatinous agents.

Claims

A composition for coating, sealing, sealing and protecting, comprising an isocyanate-curable polymer and an elastomer, characterized in that it consists of an elastomeric material or a rubber having a particle size of not more than 0.4 mm, present in a an amount of 20-50% by weight, an isocyanate curable polymer base, present in an amount of 40-55% by weight, a polymer-curing isocyanate in an amount of 18-30% by weight, and an aliphatic polyethylene polymer. 10 here-glycol in an amount of 1 to 5% by weight, which after curing the polymeric material constitutes the elastic and adhesive part of the composition, and optionally further contains a color pigment, a zeolite-type desiccant, an active alumina and / or an aluminum silicate.

Composition according to claim 1, characterized in that the polymer base consists of a polymer of a polyester type in a mixture with a polymer base of the polyether-glycol type.

Composition according to claim 1, characterized in that the elastomeric rubber material has a particle size of 0.01 - 0.2 mm.

Composition according to claim 1, characterized in that the polymer base is an isocyanate-curable polyepoxide.

Composition according to claim 1, characterized in that the polymer base is a polyurethane.

Process for preparing a composition according to claims 1-7, characterized in that the rubber powder having a particle size of not more than 0.4 mm is provided together with an isocyanate-curable polymer base, an aliphatic polyether glycol and optionally a colored pigment. DK 171939 B1 and then mixed with a polymer-curing isocyanate, after which the mixture is subjected to evacuation to a pressure of not more than 0.9 bar.

Process according to claim 8, characterized in that the pressure is 0.5 - 0.8 bar, preferably 0.8 bar.

Method of applying a composition according to claims 1-7 by means of high pressure, characterized in that the composition exclusive of the hardener is drawn into a modified two-component high-pressure pump and brought together with the hardener prior to the outlet through a mixing tube, a pressure plate is placed on the high pressure pump, which pressure plate is pressed down into the composition to press it into the pump, that the composition is heated to> 40 ° C in connection with said pump at a pressure of 150 kg / cm 2 or more.