Acrylic adhesive Introduction
Water Based acrylic pressure sensitive adhesives have extensive usage in different industry area,such as label sticker, paper, BOPP Tape etc. The formula have little difference according to different backing material and functional request. Such as viscosity, solid rate, additives etc.
For completely explain the concept of Acrylic adhesives, here I will explain the upstream raw materials, so that we can understanding the complexity and principle of acrylic adhesive.
Upstream raw material explanation
|Acrylic Acid||Acrylic acid is an organic compound (CH2=CHCOOH) . It is the simplest unsaturated carboxylic acid. It is used for synthesize various acrylates and polyacrylates of different molecular weights||Acrylic acid is produced by oxidation of propylene, which is a byproduct of ethylene and gasoline production.|
CH2=CHCH3 + 3⁄2 O2 → CH2=CHCO2H + H2O
|Acrylate||Acrylates are the esters and conjugate bases of acrylic acid and its derivatives. It can be used for producing adhesives, synthetic resins, special rubbers and plastics.|
Methyl Acrylate (MA)
Butyl acrylate (BA)
Ethyl Acrylate(EA )
|Acrylates are industrially prepared by treating acrylic acid with the corresponding alcohol in presence of a catalyst.|
Formula of BOPP/Double-side/Label Tape Water based acrylic adhesives (PSA)
Acrylic adhesives(also called emulsion glue,due to the milky appearance) is using for produce tapes by coating machine, then we can get the sticky tapes.
|Formula composition||Proportion(%)||CAS No.|
|Butyl acrylate （BA）||65~85||141-32-2|
Firstly, put the monomers in the formula are mixed in proportion, slowly added to the soft water , then stirred smoothly until temperature rise. Secondly,the transition phase temperature is controlled at 83-87 ° C, add the additives , then reacted at 77-79 ° C with one hour. Finally, cooling to below 40 ° C, use 100 mesh filter to obtain water-based acrylic pressure sensitive adhesive(PSA)
It’s easy to say, but do good quality adhesives.In conclusion, it need more practices ,especially additives, temperature control,proportion etc
|Sticky time hr·40°C.1Kg||≥8|
|Useful life (days)||180|