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 values given in parentheses are for information only. The strong peak at 5. The functionalization is an esterification reaction between hydroxyl groups of oligolactide diols and carboxylic groups of astm d4752 acid.
Acid values of the OL-As after neutralization were also determined. After UV curing, an increase in T g is observed for all cases as a result of the formation of crosslinked film astm d4752 restricts the chain mobility. Introduction Acrylate oligomers are the main vehicles found in the formulation of UV-curable screen printing ink.
Moreover, it is observed that the yield stress of OL-As decreases with a decrease in the molecular weight but an increase in the chain length of ring opener. The ring opening polymerization is preferable when compared to other routes because the reaction consumes low reaction temperature and short reaction time.
Oligolactide diols were synthesized from the ring opening reaction of l -lactide with three kinds of diol ring openers: The curing of the inks was evaluated by the solvent astm d4752 rub test.
However, the astm d4752 residue remains astm d4752 most cases and emulsions which are difficult to separate are also formed during the washing process [ 16 ]. Inefficient removal of the byproduct water may lead to the reversal of the reaction, resulting in incomplete functionalization.
Practice D is the preferred method for organic coatings. One email with all astm d4752 results. After vacuum distillation of the functionalized product to remove the azeotropic solvent and unreacted acrylic acid, it was found that some residual acrylic acid still remained in the product, as confirmed by acid value determination. Thus, the neutralization of the astm d4752 acrylic acid was performed by reacting with diglycidyl ether bisphenol A DGEBA.
Acid value and viscosity of oligolactide acrylates.
You may find similar items within these categories by selecting from the choices below:. At present, the conventional synthetic oligomer starting materials are generally manufactured from petroleum which is a non-renewable resource. In order to investigate the appearance of black ink print, BDAN was selected to produce a black screen printing ink due astm d4752 its highest l -lactide content, while still having low viscosity. AA was added into a mL three-neck round-bottom flask equipped with a thermometer, a magnetic stirrer, a nitrogen gas inlet tube, a Dean—Stark separator, and a condenser.
The flexibility measured by bending test, as well as the impact resistance astm d4752 all the films were also excellent. Astm d4752 value of OL-As at increasing shear rates.
Neutralization reaction scheme of acrylic acid with diglycidyl ether bisphenol A [ 29 ]. Therefore, the purpose of this research was to investigate the effects of the amount and type of diol ring astm d4752 having different alkyl chain length on astm d4752 properties of the 4d752 oligolactide acrylates.
The peak at 2.
The inks formulated from oligomers with lower molecular weight exhibited better ink flow property. An increase in the alkyl chain astm d4752 of the ring openers resulted in oligomers with lower viscosity. A certain minimum degree of cure is necessary prior to topcoating. Astm d4752 reaction was carried out in the presence of a small amount of tert-butylhydroquinone acting as an inhibitor to prevent astm d4752 polymerization of AA during functionalization.
Apart from being diluents, these monomers play an important role in improving the coating properties of ink such as flexibility, adhesion, etc.
A mixture of Oxy-phenyl-acetic acid 2-[2-oxophenyl-acetoxy-ethoxy]-ethyl ester and Oxy-phenyl-acetic acid 2-[2-hydroxy-ethoxy]-ethyl ester Irgacure was purchased from Merit Solution Co. Considering the effects of the alkyl chain length on an increase in T astm d4752the cured ink prepared from OL-A with the longer chain length shows a higher increase in T g. This might be due to the fact that the longer chain length exhibited astm d4752 intermolecular hydrogen bonding interaction.
The obtained oligomers were characterized, and the viscosities of oligolactide acrylates were measured.
ASTM D4752 – 10(2015)
Firstly, low astm d4752 weight oligolactide diols were prepared by ring opening reaction of l -lactide with diols. Viscosity values of wet inks. D44752 peaks at 1. Acrylate functionalization scheme of an oligolactide diol with acrylic acid. One email for each astm d4752. After that, the oligolactide diols were functionalized with acrylic acid and the residual acrylic acid was neutralized with diglycidyl ether of bisphenol A.
Solvent Resistance Rub Test – ASTM D4752
Specific hazard statements are given in Section 6. Your basket is empty.
satm An increase in the alkyl chain length of the ring openers resulted in oligomers with lower viscosity and a decrease in T astn. Search all products by. You can astm d4752 change the view style astm d4752 any point from astm d4752 main header when using the pages with your mobile device. The reaction is conducted in the presence of an acid esterification catalyst and a polymerization inhibitor under azeotropic distillation [ 15 ].
It can be observed that all OL-As exhibit shear thinning behavior for astm d4752 the viscosity decreases as the shear rate increases. Such a hydroxyl end group is able to react with acrylic acid to yield an oligomer possessing vinyl double bonds.
Take the smart route to astm d4752 medical device compliance. Similar to the OL-As, the rheological behavior of the obtained inks was dependent on the molecular weight of the OL-As.