CS216873B1 - Heat-curable adhesive with increased heat resistance - Google Patents
Heat-curable adhesive with increased heat resistance Download PDFInfo
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Abstract
Vynález rieši za tepla tvrditelné lepidlo so zvýšenou tepelnou odolnosťou lepeného spoja, vhodné pre lepenie kovov alebo kovu s niektorými plastickými hmotami, najma pre lepené spoje kov s obložením. Účelom vynálezu je zlepšenie mechanických vlastností lepeného spoja pri súčasnom znížení nákladov na lepenie. Uvedeného účelu sa dosiahne za tepla tvrditelným lepidlom so zvýšenou tepelnou odolnosťou, ktorého podstatou je, že obsahuje 0,5 až 4 hmotnostně diely fenolformaldehydovej živice (novolaku) so 6 až 12 % hexametylentetraminu modifikované] 0,05 až 3 hmotnostnými dielmi polyvinylbutyralu a rozpustenej v 5 až 9 hmotnostných dieloch rozpúšťadla.The invention provides a heat-curable adhesive with increased heat resistance of the glued joint, suitable for bonding metals or metal with certain plastics, especially for glued joints of metal with lining. The purpose of the invention is to improve the mechanical properties of the glued joint while simultaneously reducing the costs of gluing. The stated purpose is achieved with a heat-curable adhesive with increased heat resistance, the essence of which is that it contains 0.5 to 4 parts by weight of phenol formaldehyde resin (novolak) with 6 to 12% hexamethylenetetramine modified] 0.05 to 3 parts by weight of polyvinyl butyral and dissolved in 5 to 9 parts by weight of solvent.
Description
(54) Za tepla tvrditel'né lepidlo so zvýšenou tepelnou odolnosťou(54) Thermosetting adhesive with increased heat resistance
Vynález rieši fenolické za tepla tvrditefné lepidlo so zvýšenou tepelnou odolnosťou lepeného spoja, vhodné pre lepenie kovov alebo kovu s niektorými plastickými hmotami, najma pre lepené spoje kov s obložením.SUMMARY OF THE INVENTION The present invention provides a phenolic thermosetting adhesive with improved heat resistance of a bonded joint suitable for bonding metals or metal with some plastics, in particular for bonded metal with lining.
V súčasnosti je známa celá rada fenolických za tepla tvrdíte 1’ných lepidiel na kovy, dřevo a plastické látky. Lepený spoj s týmito lepidlami však stráca dostatočnú mechanickú pevnost už pri teplotách okolo 100 °C. Menej známe sú fenolické za tepla tvrditelné lepidlá, zachovávajúce dostatočne vefkú pevnost lepeného spoja pri teplotách vyšších ako 300 °C. Sú to špeciálne upravené fenolické lepidlá zvlášť modifikované. Tieto lepidla tvoria hlavně fenolformaldehydové živice, kondenzované s prebytkom formaldehydu v zásaditom prostředí (rezoly) a modifikované polyvinylacetálovou živicou. Pre doslahnutie zvýšenej tepelnej odolnosti lepeného spoja, najma polyvinylformalom, menej polyvinylbutyralom. Například je známe fenolické lepidlo so zvýšenou tepelnou odolnosťou, ktorého podstatou je roztok fenolických modifikovaných živíc v zmesi rozpúštadiel, a to liehu, metyletylketonu a dichloretanu. Nevýhodou tohto lepidla sú horšie mechanické vlastnosti lepeného spoja najma pri teplotách vyšších ako 300 °C. Priemerná pevnost lepeného spoja dosiahnutá na spojkovom trecom obložení sa pohybuje pri 23 °C 467 N.crn'2, pri 170/C 306 N.cm'2, a pri 310 °C iba 124 N.cnr2. Dalšími nevýhodami tohoto lepidla je, že suroviny na jeho výrobu sú tažko dostupné a v neposlednom radě i jeho neprimeraná cena.A number of phenolic hot curing adhesives for metals, wood and plastics are now known. However, the adhesive bond with these adhesives loses sufficient mechanical strength even at temperatures around 100 ° C. Less well known are phenolic thermosetting adhesives maintaining sufficiently high bond strength at temperatures above 300 ° C. These are specially modified phenolic adhesives specially modified. These adhesives consist mainly of phenol-formaldehyde resins condensed with excess formaldehyde in basic medium (resols) and modified with polyvinyl acetal resin. To achieve increased heat resistance of the adhesive joint, in particular polyvinylformal, less polyvinylbutyral. For example, a phenolic adhesive with increased heat resistance is known which is based on a solution of phenolic modified resins in a mixture of solvents, namely alcohol, methyl ethyl ketone and dichloroethane. A disadvantage of this adhesive is the inferior mechanical properties of the adhesive joint, in particular at temperatures above 300 ° C. The average bond strength achieved on the clutch friction lining is at 23 ° C 467 N.cm 2 , at 170 / C 306 N.cm 2 , and at 310 ° C only 124 N.cn 2 . Another disadvantage of this adhesive is that the raw materials for its production are hardly available and, last but not least, its excessive price.
Vyššie uvedené nedostatky odstraňuje za tepla tvrditefné lepidlo so zvýšenou tepelnou odolnosťou, ktorého podstatou je, že obsahuje 0,5 až 4 hmotnostně diety fenolformaldehydovej živice (novolaku) so 6 až 12 % hmot. hexametylentetraminu s bodom maknutia nad 90 °C modifikovanej 0,05 až 3 hmotnostnými dielmi polyvinylbutyralu a rozpustného v 5 až 9 hmotnostných dieloch rozpúšťadla, ktorým može byť etylalkohol, metylalkohol, vyššie alkoholy, chlorované uhlovodíky, připadne ich kombinácia. Zmes liehu a dichloretanu ufahčuje rozpúšťanie modifikačnej přísady. Liehový roztok lepidla však vykazuje lepšie mechanické vlastnosti lepeného spoja ako roztok lepidla v zmesi liehu a dichloretanu a daleko lepšie vlastnosti ako známe fenolické lepidlo v roztoku zmesi liehu, metyletylketonu a dichloretanu.The above-mentioned drawbacks are overcome by a thermosetting adhesive having an increased heat resistance, which is characterized in that it contains 0.5 to 4% by weight of a dietary phenol-formaldehyde resin (novolak) with 6 to 12% by weight. hexamethylenetetramine having a sticking point above 90 ° C modified with 0.05 to 3 parts by weight of polyvinyl butyral and soluble in 5 to 9 parts by weight of a solvent, which may be ethyl alcohol, methanol, higher alcohols, chlorinated hydrocarbons, or a combination thereof. The alcohol / dichloroethane mixture facilitates the dissolution of the modifying additive. However, the alcoholic glue solution exhibits better mechanical properties of the adhesive bond than the glue solution in the alcohol / dichloroethane mixture and far better properties than the known phenolic glue in the solution of the alcohol / methyl ethyl ketone / dichloroethane mixture.
Lepidlo sa připraví tak, že sa v rozpúšťadle rozpustí polyvinylbutyral, či už vo formě prášku alebo fólie. Do roztoku sa přidá fenolformaldetiydová živica (novolakj s tiexametylentetraminom a nechá sa rozpustit. Lepidlo sa naneste na jednu z lepených plQch. Nanesená vrstva lepidla sa ponechá vysušit 24 hodin pri normálnej teplote. Lepené plochy sa potom priložia k sebe a zlepováný spoj sa zaťaží tlakom 1 MPa vo fixačnom přípravku. Vytvrdenie lepeného spoja sa vykoná v peci pri teplote v rozsahu 170 °C až 200 °C po dobu 30 až 60 minút od dosiahnutia predpísanej lehoty. Lepený spoj si udrží dostatočnú pevnost v smyku i pri teplote 360 °C.The adhesive is prepared by dissolving polyvinyl butyral in the solvent, whether in powder or foil form. Phenol-formaldehyde resin (novolak with thixamethylenetetramine) is added to the solution and allowed to dissolve. Apply the adhesive to one of the bonded surfaces. Allow the adhesive to dry for 24 hours at normal temperature. The adhesive is cured in an oven at a temperature between 170 ° C and 200 ° C for 30 to 60 minutes after the prescribed time has been reached, and the adhesive bond retains sufficient shear strength even at 360 ° C.
Výhodou lepidla podl’a vynálezu je, že sa dá vyrobit z dostupných (materiálov) surovin a za nižšiu cenu, ako v súčasnosti existujúce lepidlá, pričom vykazuje lepšie mechanické vlastnosti lepeného spoja. Práškový polyvinylbutural, ako jednu zo základných surovin je možné s výhodou nahradit priemyselným odpadom polyvinylbutyralovej fólie.The advantage of the adhesive according to the invention is that it can be made from available (materials) raw materials and at a lower cost than the existing adhesives, while showing better mechanical properties of the adhesive joint. Polyvinylbutural powder, as one of the basic raw materials, can be advantageously replaced by industrial waste of polyvinylbutyral foil.
Přípravu lepidla z róznych komponentov, sposob lepenia a dosiahnuté výsledky najlepšie osvětila nasledujúce příklady:The following examples best explain the preparation of the adhesive from the various components, the gluing method and the results achieved:
Příklad 1Example 1
V 70 gramoch liehu sa rozpustilo 9 gramov polyvinylbutyralu Mowital B 60 H. Po rozpuštění sa přidalo 21 gramov fenolformaldehydovej živice s hexametylentetraminom vo formě bakelitového tmelu BT — 4 a rozpustilo za miešania. Vzniklé lepidlo nanesené v množstve 0,04 g/cm2 na trecie obloženie Favorit sa nechalo vysušit pri normálnej teplote 24 hodin. Potom sa obloženie lepenou plochou přiložilo k odmaštěnému ocelovému plechu, a spoj sa zaťažil tlakom 1 MPa v přípravku. Prípravok s lepenými spojmi sa vložil do vyhriatej pece a po naběhnutí na teplotu sa nechal lepený spoj vytvrdiť pri teplote 175 °C po dobu 60 minút. Pevnost' takto zlepeného spoja v smyku dosiahla priemerne tieto hodnoty:9 grams of polyvinyl butyral Mowital B 60 H was dissolved in 70 grams of alcohol. After dissolution, 21 grams of phenol-formaldehyde resin with hexamethylenetetramine as a BT-4 bakelite sealant were added and dissolved with stirring. The resulting adhesive applied at 0.04 g / cm 2 on the Favorit friction lining was allowed to dry at normal temperature for 24 hours. Thereafter, the adhesive surface was applied to the degreased steel sheet, and the joint was loaded with a pressure of 1 MPa in the fixture. The glue was placed in a heated furnace and after the temperature had reached the temperature, the glue was allowed to cure at 175 ° C for 60 minutes. The shear strength of the bonded joint thus reached on average the following values:
pri teplote 25 °C 868 N.cm-2 pri teplote 170 °C 641 N.cm-2 pri teplote 310 °C 354 N.cm-2 at 25 ° C 868 N.cm -2 at 170 ° C 641 N.cm -2 at 310 ° C 354 N.cm -2
Příklad 2Example 2
V 100 gramoch liehu sa rozpustilo 9 gramov odpadovej polyvinylbutyralovej fólie Butaflex. Po rozpuštění sa přidalo 21 gramov fenolformaldehydovej živice a hexametylentetraminu vo formě bakelitového tmelu B-4 a rozpustilo za miešania. Vzniklé lepidlo nanesené v množstve 0,04 g/cm2 na trecie obloženie Favorit sa ponechalo vysušit pri normálnej teplote 24 hodin. Potom sa obloženie lepenou plochou přiložilo k odmaštěnému ocelovému plechu a spoj sa zaťažil tlakom 1 MPa v přípravku. Prípravok s lepenými spojmi sa vložil do vyhriatej pece a po naběhnutí na teplotu sa nechal lepený spoj vytvrdiť pri teplote 180 °C po dobu 60 minút. Pevnost takto zlepeného spoja v smyku dosiahla priemerne tieto hodnory:9 grams of Butaflex waste polyvinyl butyral foil was dissolved in 100 grams of alcohol. After dissolution, 21 grams of phenol-formaldehyde resin and hexamethylenetetramine in the form of B-4 Bakelite Sealant were added and dissolved with stirring. The resulting adhesive applied at 0.04 g / cm 2 on the Favorit friction lining was allowed to dry at normal temperature for 24 hours. Thereafter, the adhesive surface was applied to the degreased steel sheet and the joint was loaded with a pressure of 1 MPa in the fixture. The adhesive joint preparation was placed in a heated furnace and after the temperature had started, the adhesive joint was allowed to cure at 180 ° C for 60 minutes. The shear strength of the bonded joint thus reached on average the following values:
216 873216 873
Příklad 3 pri teplote pri teplote pri teplote pri teploteExample 3 at temperature at temperature at temperature
V 140 gramoch rozpustldla lieh a dichloretan v pomere 2:1 sa rozpustilo 12 gramov odpadovej polyvinylbutyralovej fólie Butaflex. Po rozpuštění sa přidalo 18 gramov fenolformaldehydové] živice s hexametylentetraminom vo formě bakelitového tmelu BT-4 a rozpustilo za miešania. Vzniklé lepidlo nanesené v množstve 0,04 g/cm2 na trecie obloženie Favorit sa nechalo vysušit pri normálnej teplote 24 hodin. Potom sa obloženie lepenou plochou přiložilo k odmaštěnému ocetovému plechu a spoj sa zaťažil tlakom 1 MPa v přípravku. Prípravok s lepenými spojmi sa vložil do vyhriatej pece a po naběhnutí na teplotu sa nechal lepený spoj vytvrdiť pri teplote 180 °C po dobu 60 minút. Pevnost takto zlepeného spoja v šmyku dosiahla tieto hodnoty:12 grams of Butaflex waste polyvinyl butyral foil were dissolved in 140 grams of ethanol and dichloroethane in a 2: 1 ratio. After dissolution, 18 grams of phenol-formaldehyde] resin with hexamethylenetetramine in the form of BT-4 Bakelite Sealant was added and dissolved with stirring. The resulting adhesive applied at 0.04 g / cm 2 on the Favorit friction lining was allowed to dry at normal temperature for 24 hours. Thereafter, the adhesive pad was applied to the degreased vinegar plate and the joint was loaded with a pressure of 10 bar in the fixture. The adhesive joint preparation was placed in a heated furnace and after the temperature had started, the adhesive joint was allowed to cure at 180 ° C for 60 minutes. The shear strength of the bonded joint has reached the following values:
PREDMET VYNÁLEZUOBJECT OF THE INVENTION
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS30681A CS216873B1 (en) | 1981-01-16 | 1981-01-16 | Heat-curable adhesive with increased heat resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS30681A CS216873B1 (en) | 1981-01-16 | 1981-01-16 | Heat-curable adhesive with increased heat resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS216873B1 true CS216873B1 (en) | 1982-11-26 |
Family
ID=5334942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS30681A CS216873B1 (en) | 1981-01-16 | 1981-01-16 | Heat-curable adhesive with increased heat resistance |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS216873B1 (en) |
-
1981
- 1981-01-16 CS CS30681A patent/CS216873B1/en unknown
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