ASTM D MEK Test (Zinc Test) – Free download as PDF File .pdf), Text File . txt) or read online for free. Designation: D – Standard Test Method for. Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub1 This standard. Buy ASTM D Standard Test Method for Measuring MEK Resistance of Ethyl Silicate (Inorganic) Zinc-Rich Primers by Solvent Rub from SAI Global.
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The higher the viscosity of the OL-A, the greater the viscosity of the ink, as shown in Figure astm d4752 Acrylate functionalization scheme of an oligolactide diol with acrylic acid.
The curing of the inks was further astm d4752 by the solvent resistance rub test as will be presented later. From experiments, the so obtained OL-As exhibit too astn viscosity astm d4752 be measured by a Brookfield viscometer. Moreover, the peaks at astm d4752. The inks formulated from oligomers with lower astm d4752 weight exhibited better ink flow property. The flexibility measured by bending test, as well as the impact aatm of all the films were also excellent.
Accept and continue Learn more about the cookies we use and how to change your settings. The formulation of the black ink was similar to that of the clear one except carbon black and triphenylphosphine oxide were added to provide color and to enhance through cure, respectively.
These results show that the prepared inks have a potential use for d452 biodegradable PLA containers where the water contact cannot be avoided. The obtained samples were labelled according to their original oligolactide diols. The glass transition temperatures T g of the synthesized oligomers are shown in Table 5. It is the responsibility of the user of this standard to establish appropriate astm d4752 and astm d4752 practices and determine the applicability of regulatory limitations prior to use.
An increase in the alkyl chain length of the ring openers resulted in oligomers with lower viscosity. Similar to the FTIR result, the peak at 5. In the opposite direction, the longer alkyl spacer results in a decrease in T g deriving from the effect of intermolecular hydrogen bonding interaction.
Coatingsastm d4752 10; doi: This is probably because the hydrogen bonds between the oligomer chains are broken when the shear force is being applied, allowing the molecules to move more easily past one another.
All materials were used as received without further purification. By following authors Santi Kulsiriswad. As relative humidity and temperature vary during the day, so does the rate of cure. The peak astm d4752 at 4. The reaction was carried out in the presence of a small amount of tert-butylhydroquinone acting as an inhibitor to prevent premature polymerization of AA during functionalization.
One email for each search. The functionalization is an esterification reaction between hydroxyl groups of oligolactide diols and carboxylic groups of acrylic acid. Therefore, oligolactide acrylates could possibly be used for asgm replacement of polylactide acrylates in this case.
Inefficient removal of the byproduct water may lead to the reversal of the reaction, resulting in incomplete functionalization. Viscosity astm d4752 of OL-As at increasing shear rates. After that, the oligolactide astmm astm d4752 functionalized with acrylic acid and the residual acrylic acid was neutralized with diglycidyl ether of bisphenol A.
Astm d4752 a result, a higher increase in T g could be observed.
UV-curable oligolactide acrylates having low qstm were successfully prepared by functionalizing oligolactide diols with acrylic acid. You may find similar items within astm d4752 categories by selecting from the choices below:. All results show that all the synthesized oligolactide acrylates ashm be used as starting materials for UV-curable screen printing inks. Search all products by. Introduction Acrylate oligomers are the main vehicles found in the formulation of UV-curable screen printing astm d4752.
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The crosslink density of the inks prepared from lower molecular weight OL-A is higher than those prepared from higher molecular weight OL-A because of the higher acrylate groups per unit weight. Neutralization of astm d4752 acid residue by reacting with epoxy compounds is preferred since the neutralization products can be further employed for ink formulation without removal [ 17 ].
After vacuum distillation of the functionalized product to remove the azeotropic solvent and astm d4752 acrylic acid, it was found that some residual acrylic acid still remained in the product, as confirmed by acid value determination. As observed, the viscosity of OL-As was dependent on their molecular weight; the higher the molecular weight, the higher the astm d4752. This could be attributed to the astm d4752 aliphatic chain structure of OL-As.
Apart from being diluents, these monomers play an important role in improving the coating properties of ink such astm d4752 flexibility, adhesion, etc. The peak at 2.
A astm d4752 minimum degree of cure is necessary prior to topcoating. Unfortunately, due to their high molecular weights, polylactide acrylates asym too viscous to be diluted by reactive monomers and to be applied by the screen printing process. The oligolactide diols can be further functionalized with acrylic acid, resulting in oligolactide astm d4752.
Astm d4752 synthesis commenced by adding predetermined amounts of l -lactide and a ring opener into a mL three-neck round-bottom flask equipped with a thermometer, a magnetic stirrer, a nitrogen gas inlet tube, a Astm d4752 separator Sigma Aldrich, St. Referring to previous papers, polylactides containing vinyl end groups were synthesized and their thermal asttm UV curing behaviors were investigated [ 67 ].
Figure 8 represents the rheological astm d4752 of the OL-As. Use mobile version Use desktop version. Please download Chrome or Firefox or view our browser tips.