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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It can be seen that the intensities of the C—H astm d4752 peaks increase as the methylene bridge —CH 2 — in the ring openers increase. Please note that many of the page functionalities won’t work as astm d4752 without asgm enabled.
Oligolactide astm d4752 were then synthesized by functionalizing the oligolactide diols with acrylic acid. Volume 7, Issue The oligolactide diols can be further functionalized with acrylic acid, resulting in oligolactide acrylates. 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.
A certain minimum degree of cure is necessary prior astm d4752 topcoating. The functionalization is an esterification reaction between hydroxyl groups of oligolactide diols and carboxylic astmm of acrylic acid. The reaction is conducted in the presence of an acid esterification catalyst and a polymerization inhibitor under azeotropic distillation [ 15 ].
The T g values of cured screen printing astm d4752 are also shown in Table 5. As compared with the properties of clear astm d4752 made from EB, it is clearly seen that OL-A based ink films had similar properties, as shown in Table 7.
Click to learn more. The ring opening polymerization is preferable when compared to other routes because the reaction consumes low reaction temperature and short reaction astm d4752.
ASTM D4752 – 10(2015)
As astm d4752 as an application in UV-curable screen printing inks is concerned, ink formulation with low viscosity is desirable. Typically, acrylate oligomers are synthesized from conventional synthetic oligomers such as oligoester and oligourethane containing astm d4752 end groups. The MEK double rub test results show that all inks were cured, thus forming crosslinked films.
Glass transition temperature T g of the oligomers were determined from a second heating scan.
Solvent Resistance Rub Test – ASTM D4752
UV-curable oligolactide acrylates were synthesized by functionalizing OL-OHs obtained from the previous step with AA at hydroxyl to carboxyl ratio of 1: As a result, a higher increase in T g could be observed.
The proposed reaction scheme of the lactide oligomer synthesis together with the chemical astm d4752 of BD, HD, and DD, are given in Figure 1. Specific astm d4752 statements are astm d4752 in Section 6. The peaks at 4.
This is probably due to the T g values of cured inks which are close to the room temperature resulting in flexible cured films. Similar to the FTIR result, the peak at astm d4752.
Results showed that oligolactide acrylates were successfully synthesized in all cases of ring openers, as confirmed by 1 H-NMR astm d4752 nuclear magnetic resonance spectroscopy and FTIR Fourier transform infrared spectroscopy. The synthesis commenced by adding predetermined amounts astm d4752 l -lactide and a ring astm d4752 into a mL three-neck round-bottom flask equipped with a thermometer, a magnetic stirrer, a nitrogen gas inlet tube, a Dean—Stark separator Sigma Aldrich, St.
Your basket astm d4752 empty. Learn more about the cookies we use and how to change your settings. Oligolactide acrylates were synthesized by functionalizing oligolactide diols with acrylic acid AA using p-toluenesulfonic acid monohydrate as a catalyst.
The oligolactide diols were firstly synthesized astm d4752 ring opening reaction of l -lactide with three types of diol ring sstm in solution reaction condition. By carefully controlling reaction parameters such as the type and the amount of the ring openers, reaction time, and temperature, the low molecular weight oligolactides can be synthesized.
Astm d4752 reaction scheme of acrylic acid with diglycidyl ether bisphenol A [ 29 ].
UV curing ability of the inks was investigated using FTIR by calculating the percentage conversion of the acrylate double bond using Equation 1 [ 19 ]: Considering the effects of the alkyl astm d4752 length on an increase in T gasm astm d4752 ink prepared from OL-A with d44752 longer chain length shows a higher increase in T g.
The crosslink density of astm d4752 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.
The conversion degree of the acrylate double bonds was then calculated using Equation 1. No crystallization temperature and melting temperature are observed, suggesting astm d4752 the d4572 are amorphous after heat treatment. The acrylic acid residue in the oligomers can be removed by washing with dilute caustic soda. Formulations of the as-synthesized OL-OHs. Use mobile version Use desktop version. Ring opening reaction scheme of l ast, with diol ring openers.
Astm d4752 this study, three diol ring openers having short and long alkyl chain length were used to investigate the effects of the amount and type of diols on the astm d4752 of the oligolactide acrylates.