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.
|Published (Last):||26 March 2005|
|PDF File Size:||2.56 Mb|
|ePub File Size:||5.80 Mb|
|Price:||Free* [*Free Regsitration Required]|
A mixture astm d4752 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. Viscosity value of OL-As at increasing shear rates. After functionalization, the signals of the characteristic peaks of protons of the acrylate double bond are detected at 6. Molecular weights of synthesized oligolactide diols. Ring opening reaction scheme astm d4752 l -lactide with diol ring openers.
Practice D is the preferred method for organic coatings.
To obtain low viscosity ink formulation, acrylate astm d4752 are usually employed [ 8 ]. The conversion degree of the acrylate double bonds was then calculated using Equation 1.
The astm d4752 the viscosity of the OL-A, the greater the viscosity of the ink, as shown in Figure The peak intensity at 4. After UV curing, an increase in T g is observed for all cases as a result of the formation of crosslinked film which astm d4752 the chain mobility. The MEK resistance of some two-component ethyl silicate zinc-rich primers has been shown to correlate well with the cure of the primer as determined by diffuse reflectance infrared spectroscopy.
The crosslink density of the inks prepared astm d4752 lower molecular weight OL-A is higher than those prepared astm d4752 higher molecular weight OL-A because of the higher acrylate groups per unit weight. The inks formulated from oligomers with lower molecular weight exhibited better ink flow property. The MEK double rub test results show that all inks were cured, thus forming crosslinked films.
Neutralization reaction scheme of acrylic acid with diglycidyl ether bisphenol A [ 29 ]. The peaks at 4.
Click to learn astm d4752. You may experience issues viewing this site in Internet Explorer 9, 10 or The viscosities of the wet inks were measured, and it was found that the viscosity of the ink was dependent on the viscosity of the OL-A.
The T astm d4752 results emphasize the physical properties such as moderate pencil hardness, high impact resistance, and high flexibility. One astm d4752 for each search. Ast, is probably due to the difference in the type and structure of the starting oligomers.
Solvent Resistance Rub Test – ASTM D4752
This study aimed to synthesize low viscosity oligolactide acrylates for UV-curable inks from oligolactide diols. As observed, the viscosity of OL-As was dependent on their molecular weight; the higher the molecular weight, the higher the astm d4752. Results show that this astm d4752 can be used to produce low viscosity, bio-based oligolactide acrylates for UV-curable screen printing inks. Thus, the neutralization of the residual acrylic acid was performed by reacting with diglycidyl ether bisphenol A DGEBA.
You can also change the view style at any point from the main header when using the pages with d4572 mobile device. Moreover, it is observed that the yield stress of OL-As decreases with a decrease in the molecular weight but an asttm astm d4752 the chain length of ring opener. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Similar awtm the FTIR result, the peak at 5. The cured ink films atm from OL-As had no sign of blistering and softening after rubbing with MEK for double rubs. The T g sstm of astm d4752 screen printing inks are also shown in Table 5. The oligolactide diols were firstly synthesized by ring opening reaction of l -lactide with three types of diol qstm openers in solution asfm condition.
Apart from being diluents, these monomers play xstm important role in improving the coating properties of ink such as flexibility, adhesion, etc. Therefore, the purpose of this astm d4752 was to investigate the astm d4752 of the amount and type of diol ring openers having different alkyl chain length on the properties of the obtained oligolactide acrylates.
The reaction was carried out in the presence of a small d475 of tert-butylhydroquinone acting as an inhibitor to prevent astm d4752 polymerization of AA during functionalization. Introduction Acrylate oligomers are the main vehicles found in the formulation of UV-curable astm d4752 printing ink. For pencil hardness test, the ink films exhibited good hardness at a level of 3H due to high content astm d4752 crosslinking.
Search astm d4752 products by. 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. However, the acrylate peaks did not completely disappear, indicating the incomplete conversion of the acrylate double bonds.
UV-curable oligolactide acrylates having low viscosities were successfully prepared by functionalizing oligolactide diols with acrylic acid. Use mobile version Use desktop version. As compared with the properties of clear ink made from EB, it is clearly seen that OL-A based ink films had similar properties, as shown in Table 7.
All materials were used as received without further purification. Acrylate functionalization scheme of astm d4752 oligolactide diol with acrylic acid.
When considering the types of ring openers, the one having longer alkyl chain length was found to have lower viscosity. After neutralization, T g values of the OL-As increase which may be due to decreased mobility of the final product, caused by the presence of the neutralization product, DGEBA acrylate, which has aromatic rings in its structure Figure 7.
The astm d4752, easier way to work with standards. 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. Results showed astm d4752 oligolactide acrylates were successfully synthesized in all cases of ring openers, as confirmed by 1 H-NMR proton nuclear magnetic resonance astm d4752 and FTIR Fourier transform infrared spectroscopy.