A bio-based polyurethane pressure sensitive adhesive

Polylactic acid (PLA) is an important biodegradable polymer material. Polylactic acid (PLA) is made from corn or potato starch as the basic raw material. It is biodegradable to produce carbon dioxide and water in nature, so it is a kind of green and environment-friendly material. Polylactic acid has similar mechanical strength and processing properties as polyolefin. However, its shortcomings such as poor gas barrier, poor heat resistance, high brittleness, slow crystallization rate, and low crystallinity limit its further application. In particular, polylactic acid has the disadvantages of poor toughness and non-conductivity, so it can not be used in the field of pressure-sensitive adhesive which needs conductive properties.

Therefore, it is necessary to modify polylactic acids, such as blending, copolymerization, and nanocomposite, in order to meet the required properties of bio-based polyurethane pressure-sensitive adhesive. In order to solve the above problems, we invented a bio-based polyurethane pressure-sensitive adhesive with good electrical conductivity and mechanical properties.

Preparation involves the following steps:

Step 1: Take sodium oleate-modified calcium sulfate whisker dissolved in ethyl acetate, stir to get calcium sulfate whisker dispersion; Molybdenum-disulfide grafted chlorosilane was dissolved in ethyl acetate and stirred to obtain molybdenum-disulfide dispersion solution. Polyol poly (lactic acid) (PLA) dissolved in butanone, adding calcium sulfate whisker dispersion, mos2 dispersion, stir evenly, add dicyclohexyl carbon 2 imide, under 40-60 ℃ the nitrogen protection, adding diisocyanate, organic bismuth catalyst, in 50 -heating reaction 4 -6 h under 80 ℃, obtain the dimer; Adding neutralizing agent triethylamine, reaction 5 -20 min; the chain extender diethanolamine is dissolved in water to obtain diethanolamine solution, adding the diethanolamine solution, stirring, so that the polymer emulsification form emulsion, distillation of acetone in the emulsion to obtain biobased polyurethane glue;

Step 2: apply biological base polyurethane adhesive, more and more methyl phenyl isocyanate, dimethyl cyclohexylamine, surfactant AEO-3, antioxidant 1010, 326, ultraviolet absorbent UV-stir 3 -4 h, filtration, biological base polyurethane pressure sensitive adhesive.