03.11.2015
UV curable adhesives are single part, solvent free, cure-on-demand adhesives suitable for a wide range of applications. Their use is widespread, particularly in medical device assembly and the electronics industry.
Save Energy and Space – A UV curing light requires less electricity and space compared to ovens.
UV curable adhesives do not dissolve, melt or weaken the surfaces of the mated items or surfaces. We are sorry to have missed you - we are available Monday-Friday8am to 4pm pst Please leave a message and we will get back to you as soon as possible! This item will be shipped through the Global Shipping Program and includes international tracking. Will usually ship within 1 business day of receiving cleared payment - opens in a new window or tab. This paper is adapted from work originally presented at the 2001 International Waterborne, High-Solids, and Powder Coatings Symposium.Table 1Background Gloss is a measure of the amount of light reflected from a surface at a given angle, and is expressed as a value between 0 and 100. Differential scanning calorimetry (DSC) is a powerful tool for studying the kinetics of curing reactions.6 A variety of kinetic data may be garnered from DSC traces acquired in isothermal or dynamic mode, including the enthalpy of curing, the length of time to cure at specific temperatures, the temperatures at which curing begins or exhibits a maximum in the curing exotherm under specific heating rates, and the extent of cure at certain conditions.
In addition to using precatalyzed polyester resins, it is possible to add catalyst independently.
A number of formulations containing an acid functionalized reactive additive, SMA 10840, were prepared. Our September issue focuses on sustainable solutions, specialty chemicals, architectural coatings and the latest pigment technology. The adhesives contain photo-initiators that react to specific light wavelengths, thus causing the curing process to begin.
UV curable adhesives products became popular in medical device assembly field in the late 1980’s, when restrictions on solvent bonding drove manufacturers to find a more environmentally and user-friendly solutions.
A strong chemical bond is formed between the two substrates providing a high strength alternative to other curing methods. Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. Polished plate glass has a value of about 100, and a completely nonreflective surface has a value of 0. After gelation, the surface roughness remained fairly constant even with further curing, although fine structure continued to develop past the gel point. Polyester producers market "high reactivity," "active" or "low-temperature curing" polyester resins that have been admixed with catalysts during production.4 These catalysts are intended to speed the cure rate or to lower the cure temperature of high-gloss hybrid coatings. When similar systems are examined under identical heating rates, the temperature at which curing begins can be utilized as a comparative measure of cure rates. This should give formulators greater control over the properties and cost of their coatings, although a little more development work is required to optimize the formulation.


The same resins and catalysts were used as in the SMA 3000 formulations, substituting SMA 10840 for 3000. Upon exposure to UV light of the proper intensity and spectral output, these products cure rapidly to form excellent bonds to a wide variety of substrates such as metals, glass and most plastics. The boom in the electronics industry in the 1990’s, saw the introduction of many exciting new UV curing adhesives, geared to help speed up production lines by giving instant, high-performance bonding results. A UV curable system does not require the addition of curing agents and cures within seconds. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. 1In this study, the crucial role played by catalysts in the preparation of low-gloss hybrid powder coatings using a reactive additive (styrene maleic anhydride copolymer) is described.
Low gloss coatings are typically measured as 60-degree gloss, although the 85-degree gloss is also sometimes used.
Three different catalysts were tried at different levels in hybrid formulations containing Crylcoat 7402 and Albester 2250.
The catalyst can be present as a component of the polyester resin, or can be added separately to the powder paint formulation.
The range of gloss readings are loosely divided into several categories, as shown in Table 1.The chemical and physical properties of most major classes of powder coatings cure to give a level, glossy surface.
The curing onset temperature (To) and temperature of the maximum exotherm (Tmax) were measured for each sample (see Figure 2 for a typical trace).
All formulations were prepared as outlined above.The results from formulations H1 to H4 are summarized in Table 4. Formulations shown in Table 5 were prepared as previously described.The results from formulations H5-H14 are summarized in Table 6. Phosphonium salts were found to be highly effective in producing low-gloss powder coatings, and tetrabutylphosphonium bromide is particularly recommended as a catalyst for use at 0.25 to 1 phr in these types of formulations.
DSC measurements on model mixtures and fully formulated powder paints reveal relative reactivities and the role of catalysis on the various reaction steps. However, for aesthetic and functional reasons, it is often desirable to have a powder coated surface with a low gloss, or matt finish.
The curing kinetics of the three possible two-component combinations are explored first by DSC.
This onset temperature data is compiled in Table 2.These DSC studies indicate that all reactions are slow in the absence of an esterification catalyst, although the reactions of the carboxylic acid functionalized SMA resin (10840) occur at a lower temperature compared to reactions of the anhydride functionalized SMA resin (3000). All coatings were found to exhibit poorer solvent resistance than comparable epoxy formulations, which is typical of hybrids in general, probably due to a lower crosslink density. The control experiment (H5) containing no catalyst had a very high gloss with no solvent resistance, indicating that no cure took place. The gloss properties of the coatings are found to be closely tied to the presence of a catalyst.


In such cases, gloss control may be achieved through many different techniques, including the addition of inorganic fillers or organic waxes, the blending of powders of different reactivities or the use of certain reactive agents.The choice of gloss control agent depends upon the level of gloss reduction desired and the chemistry of the powder coating. The catalyst has the most pronounced effect on the reaction between the SMA resins and the epoxy resin.
Curing at 400°F or higher is recommended, as higher glosses and reduced physical properties are obtained at lower curing temperatures. Formulations H6-H11 compare the effectiveness of three different phosphorus-containing catalysts at low and high levels in an Albester 2250 formulation. However, the coatings exhibited good solvent resistance indicating that the coatings were fully cured. Several approaches to preparing powder coating formulations that exhibit fast cure kinetics, low-gloss appearance and excellent properties are described.
Fillers can give rough surfaces due to the protrusion of the fillers from the surface after baking, which disrupts reflected light. It appears that these high temperatures are required to allow curing to be as complete as possible. From the DSC studies, it is clear that SMA 10840 reacts more readily with EPON 2002 than does SMA 3000. Waxes and other incompatible ingredients tend to segregate on the surface during baking, leaving circular voids or forming a film on the surface. Epon 2002 (Shell Chemical) is a standard "Type 3" Bisphenol A epoxy resin with EEW 675-760.
The lowest glosses were obtained using the Crylcoat resin with 10 parts of SMA 3000.Inductively coupled plasma (ICP) analysis was used to determine the type and amount of catalyst present in some commercially available polyester resins. This is probably due to there being two reactive pathways available for the 10840 resin: reaction of the 10840 carboxylic acid groups with the EPON epoxy groups, and reaction of the 10840 anhydride groups with the EPON alcohol groups. Due to the nature of the production of precatalyzed polyesters, a high thermal stability catalyst is required. Therefore, the overall reactivity of 10840 with EPON is similar to that of the polyester resin with EPON. This could explain the difference in matting behavior exhibited by SMA 3000 and 10840, since it is believed that different cure rates are needed to set up the two-network morphology needed for a low-gloss finish. SMA resins designated as LO are free of acetophenone, the main odor component of SMA Resins.



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