Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1998-12-15
2000-08-08
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
1562733, 1562757, 156283, 156320, 156332, 1563796, 1563809, 156497, 156499, 522 6, 522104, B32B 3112, C09J16700
Patent
active
06099679&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for gluing and a device and a glue composition intended to be used for the gluing according to the method.
STATE OF THE ART
The agglutination of surfaces requires a substance, the glue, which may be brought to a first, tacky state, so that the glue adheres to the surfaces which are to be joined. When the surfaces have been united with the glue between them, the glue is converted to a more or less solid state, whereby the glue joint obtains its final tenacity towards rupture of the joint. The difference in cohesive force between the first and the second state may be extremely different.
Certain glues, such as urea-formaldehyde resin glues, have a very low cohesive force in the first state but provide a strong joint when the glue has hardened. Other glues, such as contact adhesives, provide a joint of a considerable strength immediately after the surfaces have been joined, but thereafter the strength of the joint does not increase very much.
The conversion from the first to the second state may, depending on the type of glue, occur in many different ways. In the first state, many glues are a tacky mass, which solidifies by means of the evaporation of a solvent. Such solvents are often non-environmentally friendly; volatile hydrocarbons are common. Other glues are hard at room temperature and are converted to a tacky state by heating. However, the utilization of a phase change in this way will normally give limited strength to the finished glue joint. In many cases, furthermore, it is not rational to work with a glue which has to be kept heated during the gluing operation. There are additional glue types and systems, which start from natural products or from more conventional chemical products or systems.
Another branch of glue technology is represented by polymeric materials. Thermoplastic systems, which are brought to a tacky state by heating and to a solid state by cooling down, do not in principle differ particularly from conventional systems with a corresponding process course. Systems with thermosetting plastics, on the other hand, represent a special branch of glue technology. Such plastics may be given a plurality of states, from thinly fluid, through viscous tacky masses, to a solid state as foils, which are converted to a tacky state by heating during the gluing process itself. After the gluing surfaces have been brought together, the glue is, by means of curing of the plastic, converted to a solid state from the first state with a more or less fluid consistency. This requires initiation of the curing, which may occur in different ways depending on the type of thermosetting plastic and its components. An addition of a chemical hardener is often used which, however, has the disadvantage that the gluing process has to be performed within a limited time and that difficulties arise when it comes to cleaning the utilised vessels and tools if the plastic is allowed to cure on these.
Thus, there are both disadvantages and limitations with the use of thermosetting adhesives since, in many cases, they may be less rational to use in industrial production than other gluing systems. In many respects, however, they possess superior properties when it comes to the strength of the glue joint, long lifetime towards ageing and small influence on the strength when heated within the temperature range during use. A further advantage is that the curing does not give any emission of environmentally harmful substances, which is the case when glues with solvents are concerned.
SUMMARY OF THE INVENTION
The present invention has as an object to provide a gluing method, which starts from a thermosetting resin glue, which is also comprised by the invention. The object is to achieve a method which is very rational to carry out in industrial production, whereby the glue in question is very convenient to handle. At the same time the earlier mentioned advantages, which are associated with thermosetting adhesives, are gained, namely high strength and heat resistance o
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patent: 3928346 (1975-12-01), Wentworth
patent: 4163810 (1979-08-01), McGinniss
patent: 4356050 (1982-10-01), Crivello et al.
patent: 5089076 (1992-02-01), Leach et al.
patent: 5281481 (1994-01-01), Hayward
patent: 5877231 (1999-03-01), Biller et al.
Bolm Helene
Karem Jaan
Ball Michael W.
DuPont Powder Coatings Scandinavia AB
Tolin Michael A.
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