IV Cyanoacrylate Adhesives Page 1

4.1 Manual Application (soft bottles and pin cap) 8.2.5 Explanation of the Safety Data Sheet for Cyanoacrylates 3.1 Cyberbond in Single-use Medical Products

1.1 Description of Products and Properties Cyanoacrylate Adhesives – short CA – are also known as super glues. Cyanoacrylates are well established in the modern adhesive industry. The most important properties of Cyanoacrylate adhesives are: one component adhesives and therefore easy to handle systems, solvent free, very fast setting time. First of all Cyanoacrylate adhesives are used to bond metals, plastics, wood and elastomers. By the way, the first Cyanoacrylate adhesive – Eastman 910 – was developed by Eastman Kodak in the 50ies of the last century. Due to their extraordinary adhesion profile...

Cyberbond 1.2 Chemical Basis and Viscosities There are two main issues manufacturers of Cyanoacrylate adhesive differentiate between and which we would like to dwell on. First of all there is the chemical basis. We are talking about the so-called monomer, which determines the suitability of the adhesive for a special application. We distinguish in different Ester groups in which the Ethyl ester is by far the most important and most popular one. But also other groups like Methyl-, Butyl-, Alkoxy- and Propylesters do have certain advantages. Secondly the viscosity cannot be ignored. The range varies...

1.4 Coloured and UV-light Detectable Cyanoacrylates Due to the fact that ever increasing automation demands 100% supervision, products have been developed which can be optically recognised by UV-radiation, causing fluorescence. Cyberbond 1022 offers a reliable product for manufacturers of smartcards. Naturally, other products can be adapted too. It is also possible to dye Cyanoacrylate adhesives in order to have a simple visual application control. The most popular colour is blue. On the contrary, there are shades of colours that make the seam of the two bonded adherents optically invisible....

Base Monomers This subject is very important because the monomer does influence the overall adhesion properties very much. When manufacturing a Cyanoacrylate you need a cyano acid ester as a basic chemical. As one always makes a connection between the prefix “cyan…” (That is cyanhydric acid) it is to mention that cyano acid ester belongs to a different chemical compound and is not classed as harmful. You can produce a Cyanoacrylate (the adhesive itself) by using a crack-and distillation procedure. The distillation process dictates the quality of the future product, because the level of purity...

2.1 Methylester (ME) The first Cyanoacrylate Adhesive ever produced was a product based on the short chained Methylester CH2=C-CN-COO-CH3. Today the importance of this type is constantly decreasing, due to the ageing properties of modern plastics and elastomers not reaching the same performance as Ethyl esters. Methyl is mainly used for bonding metal to metal and fixing difficult to bond Duroplastics. A short term higher temperature and a good resistance against most chemicals are advantages of Methyl. Due to the fact that metal to metal applications, where Methyl really perform very well, rarely...

Cyberbond 2.4 Alkoxyester (AOE – Cyberbond 5000 series) These are very long-chained Cyanoacrylate adhesives and can be described as odourless. As a matter of fact the alkoxyester are very user friendly. However, one has to accept that the strength properties are not as good when compared to bonds using ethyl. Also, alkoxyester require longer setting times. Nevertheless, sufficient results in bonding can be firmly reached. CH2=C-CN-COO-CH2-CH2- R1 bzw. 2 [R1 = -O-C2H5 (Ethoxyester) bzw. R2 = -O-CH3 (Methoxyester)] When reading the two formulas it becomes evident that alkoxylester is the genera...

Criteria for Optimal Bonding 3.1 Humidity Cyanoacrylate adhesives polymerize, respectively cure by the catalytic activity between the humidity in the air and the humidity of the adherents. The higher the relative humidity is (e.g. in a room) the faster the product cures. Best atmospheric conditions for good, reliable bonds are between 40 to 70 % relative humidity. If humidity is too low (< 30%) setting time can become very slow; if humidity is too high (>80%) a so-called shock polymerization takes place. The latter provokes a certain shrinking process of the adhesive layer, which leads to less...

Due to the polarity of noble metals such as gold, platinum and silver these materials are difficult to bond with Cyanoacrylate adhesive. Generally, all non-noble metals can be bonded. Best results are achieved with less noble metal like iron or aluminium. We would like to point out that Cyanoacrylates are not suitable for bonding metal with metal compounds. When bonding plastics the material itself and its polarity are important issues. Quite often certain fillers are mixed into the plastic which can cause adhesion problems. One item that is quite often overseen is the use of release agents in...

+ + + good, + + - satisfying, + - - bad,---impossible 3.3.3 Elastomers / Elastomers Bonding The bonding of elastomers normally is not difficult to achieve. But the formulation of the rubber has an enormous influence on setting time and strength values. In terms of setting time it has to be taken into consideration whether the mixture is turning to the polar respectively to the unpolar side. Rubbers based on polar elastomers are easier to be bonded than homopolar rubber. When bonding elastomers the basis of the raw material and the following factors are important if good ageing and strength properties...

components of the rubber mixture such as vulcanising process (sulphur or peroxide), accelerators (zinc oxides), plasticisers (aliphatic hydrocarbons), ageing protectors (amines) Experience has proved that good rubber-to-rubber or rubber-to-metal results are achieved by using Cyberbond. Even if a vulcanised joint still is the optimum in terms of strength, a bonded joint is easier and can be achieved without huge effort. There is no energy required and the application with Cyberbond can easily be fulfilled. To get a proper mitre bonding is today state of the art. But to reach good values a few...