Can polyethylene glycol diacrylate be stored at minus 20 degrees

Good afternoon, not recommended. PEGMA is an acrylate active monomer with photosensitizing functional groups, this monomer solvent is not suitable for long-term storage in both high and low temperature conditions, and the solubility of BHT will be seriously reduced at low temperatures, and may become a gel that cannot be recovered, please refer to it as appropriate. In the past, the UV that was mixed with PEGMA and HDDA and prepared to make benzophenone caused cross-linking turned out to be frozen into slimes in the refrigerator.

1. Prepare a 250ml three-neck flask, add the metered PEG400 (polymerization inhibitor hydroquinone) and install the thermometer, condenser tube and stirrer;

2. Heat, raise the temperature to 60 degrees Celsius, and after the flask material is stirred evenly, then add a certain amount of acrylic acid and catalyst p-toluenesulfonic acid and stir in turn;

3. Continue to heat up to 110 degrees Celsius, and after a certain period of reaction, then heat up to 140 degrees Celsius, and no more water is generated, and the reaction is over;

4. When the temperature of the reaction system drops to 90 degrees Celsius, vacuum distillation is carried out to remove the unreacted acrylic acid and water, and the catalyst and polymerization inhibitor are precipitated and separated by colorless crystals to obtain a brown and yellow transparent liquid.

5. The crude product was adjusted to neutral with 5% Na2CO3 solution, then washed with saturated NaCl solution, and then PEGA was extracted with 30ml of ether, the organic layer was separated, filtered, and vacuum dried under reduced pressure at low temperature for 24h to obtain a pure product.

The preparation method of high molecular weight (>3000 dalton) polyethylene glycol diacrylate (PEGDA) includes taking high molecular weight polyethylene glycol (PEG) to react with organic solvents and elemental metals, and then adding polymerization inhibitors to purify PEGDA with different yields. The method of the present invention adopts high molecular weight polyethylene glycol as raw material, avoids the use of reagent with greater volatility and toxicity, improves the elasticity of its molecule under the condition of reducing energy consumption, and simultaneously increases its synthesis yield.

Good evening, if it is PEGDMA that has been cured and crosslinked, it can be soluble in halogenated hydrocarbons, aromatic hydrocarbons, ketones and a few polar solvents such as DMF like most light-curing acrylic polymers, and the solvents that are almost non-toxic and environmentally friendly to the human body can be tried DMC (dimethyl carbonate), EPH (ethylene glycol phenyl ether) and NMP (N-methylpyrrolidone), which can also be used as a good solvent for acrylic dichloromethane, please refer to. For quick dissolution, please use an acidic antidote with phenol and dichloromethane of 1:9 for the best effect.

Since the baby is developing and relatively immature, do not let the baby touch such items to avoid adverse effects.

Where are the esters in addition to acid? What do you want?

I don't know what your requirements are, it's simple to add lime and filter it, but this will hydrolyze the product.

Polyethylene glycol performance and application 1. Polyethylene glycol series products can be used in pharmaceuticals. Polyethylene glycol with relatively low molecular weight can be used as a solvent, co-solvent, O W type emulsifier and stabilizer, used to make cement suspensions, emulsions, injections, etc., and also used as water-soluble ointment substrates and suppository bases.

Both ATRP and Raft polymerization can control the molecular weight.