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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All materials were used as received without further purification.
Oligolactide acrylates were synthesized by astm d4752 oligolactide diols with acrylic acid AA using p-toluenesulfonic acid monohydrate as a catalyst. The T g values of cured screen printing inks are also shown in Table 5.
In this study, three diol ring openers having short and long alkyl chain length were used to investigate the effects of the amount and astm d4752 of diols on the properties of ashm oligolactide acrylates. When considering the types of ring openers, the one having longer alkyl chain length was found to have lower viscosity.
Typically, acrylate oligomers are synthesized from conventional synthetic oligomers such as oligoester astm d4752 oligourethane containing hydroxyl astm d4752 groups. Accept and continue Learn more about the cookies we use and how to change your settings. Practice D is the preferred method for organic coatings. The obtained oligomers were characterized, and the viscosities of oligolactide acrylates were measured. This is probably because the hydrogen bonds between the oligomer chains astm d4752 broken when the shear force is being applied, allowing the molecules to move more easily past one another.
As far as an application in UV-curable screen printing inks is concerned, ink formulation with low viscosity is desirable. Similar astm d4752 the OL-As, the rheological behavior of the obtained inks was astm d4752 on the molecular weight of the OL-As.
The higher the viscosity of the OL-A, the greater astm d4752 viscosity of the ink, as shown in Figure Using a suitable polyol molecule as a ring opener, oligolactide with only hydroxyl end groups—oligolactide diol—can be obtained [ 11121314 ]. The conversion degree of the acrylate double bonds was then calculated using Equation 1.
ASTM D4752 – 10(2015)
Glass transition temperature T g of the oligomers were determined astm d4752 a second heating astm d4752. The glass transition temperatures T g of the synthesized oligomers are shown in Table 5. Coatings7 10; doi: Your basket is empty. The peak at 2. To obtain low viscosity ink formulation, acrylate monomers are usually employed [ 8 ].
Oligolactide acrylates were then synthesized by functionalizing the oligolactide diols with acrylic acid. The proposed neutralization reaction scheme is illustrated in Figure 7.
Viscosity values of wet inks. Therefore, the purpose of this research was to investigate the effects of the amount and type of diol ring openers having different alkyl chain length on the properties of the obtained oligolactide acrylates. It can be observed that all OL-As exhibit shear thinning behavior for which the viscosity decreases astm d4752 the shear rate increases.
Therefore, it can be concluded that astm d4752 oligolactide diols were successfully synthesized. The formulation of the black ink was similar to that r4752 the clear one except carbon black and triphenylphosphine oxide were added to provide color and to enhance through cure, respectively. In the opposite direction, the longer alkyl spacer results in a decrease in T g deriving from the astm d4752 of intermolecular hydrogen bonding interaction.
The astm d4752 is an esterification reaction between hydroxyl groups of oligolactide diols and carboxylic groups of acrylic acid. An increase in the alkyl chain length of the astm d4752 openers resulted in oligomers with lower viscosity and a decrease in T astm d4752. A certain minimum degree of cure is necessary prior to topcoating. It can be observed that the degree of functionalization is higher when the molecular weight of OL-As is lower and the alkyl chain length is longer.
This study aimed to synthesize low viscosity oligolactide acrylates for UV-curable inks from oligolactide diols.
Solvent Resistance Rub Test – ASTM D4752
After functionalization, the signals of the characteristic peaks of protons of the acrylate double bond are detected at 6. Use astm d4752 version Use desktop version. The obtained samples were labelled according to their original oligolactide diols. At astm d4752, the conventional synthetic oligomer starting materials are generally manufactured from petroleum which is a non-renewable resource.
Click to learn more. The oligolactide diols can be further functionalized with acrylic acid, resulting in oligolactide acrylates. This environmentally friendly polymer has been widely used in medical and pharmaceutical applications because of its biocompatibility astm d4752 biodegradability astm d4752 5 ].
No crystallization temperature and melting temperature are observed, suggesting that the oligomers are amorphous after heat treatment.