The glue of PE protective film is generally divided into two types: solvent-based glue and water-based glue. In general, solvent-based glue protective film can protect the surface of most products, including high-grade, high-gloss products. Water-based glue protective film can only provide protection for cold-rolled plates, iron plates, steel plates and other products that require relatively low requirements. So what are the differences in composition between these two glues? Today, let's compare the composition of protective film solvent-based glue and water-based glue to see what is different.
ONE. The solvent-based pressure sensitive adhesive has suitable initial tack, peeling force and holding force. It is suitable for the production of various protective films. It has good practical value, and has the advantages of fast drying speed, convenient coating and meeting the performance requirements of protective film.
1-1 Preparation Method:
In a stainless steel reaction kettle equipped with a stirrer, a reflux condenser, a thermometer, a feed flow meter, a dropping device, and a compressor, firstly add a mixed solvent of a formula amount and raise the temperature to 70 to 75 °C. Weigh the monomer according to the formula in another container. After mixing, add the BPO to dissolve completely. Add one-third of the mixed monomer in the reaction kettle, add the balance to the high-level dropping device. Keep stirring and heating until see a small amount of reflux, stop the heating for a while, and the reflux continues due to the reaction heat release. When the reflux is getting smaller, start adding the monomer at the temperature of about 77 ° C. Control the dropping rate and the reaction temperature to prevent the accumulation of the gas, keep the reflux normal and keep the reaction in the kettle stable. The viscosity is gradually increased, complete the addition in 4 to 5 hours, and then the temperature is raised to 80 to 82 °C. After 1 hour of reaction, add a little BPO to drive the reaction to completion. When the viscosity is stable, it is a yellow viscous liquid. Lower the temperature to 40 °C to produce the finished component A.
The B component is a 20% chlorobenzene solution of isocyanate.
Component A : Component B = 1: (0.5 to 0.8).
1-2 Raw materials and formulations:
|Material||Proportion / part by mass|
|2-Ethylhexyl acrylate (2EHA)||8~10|
|Acrylic acid (AA)||Appropriate amount|
|N-methylol acrylamide (N-MAM)||3~5|
|Butyl acrylate (BA)||50~57|
|Vinyl acetate (VAc)||10~12|
|Dibenzoyl peroxide (BPO)||0.1~0.5|
|Ethyl hydroxyethyl acrylate (HEA)||2~3|
|2-hydroxypropyl acrylate (HPA)||Appropriate amount|
II. The water-based pressure-sensitive adhesive has suitable initial tack, peeling force and holding force. It is suitable for the production of protective films for various surfaces. It has good practical value and has specialty such as fast drying speed and convenient coating, which meets the performance requirements of protective film.
Water-based pressure sensitive adhesive is a new type of special surface protection pressure sensitive material. The protective film made of this adhesive can be used for surface protection of instrumentation, color steel plate, aluminum plate, plastic door and window, advanced spray and etc.
2-1 Preparation Method:
In a stainless steel reaction kettle equipped with a stirrer, a reflux condenser, a thermometer, a dropping device, and a charging device, firstly add deionized water, emulsifier and PH regulator. Start stirring and raise the temperature to about 75 ° C, and then add 30% of the mixed monomer. Add the monomer balance to the high dropping device. Add ammonium persulfate to water to dissolve and add 20% of the initiator. After the reflux reaction was normal for about 1 hour, the reflux gradually reduces, dropwise add the monomer and add quantitative initiator every 15 minutes. Carry out the emulsion polymerization reaction smoothly at about 80 ° C, and control the stirring speed, the reaction temperature, the dropping rate and the reaction time to prevent the accumulation. After about 4 hours, raise the temperature to 85 ° C and add a small amount of ammonium persulfate to complete the reaction. Finally lower the temperature to 50 ° C. Adjust the PH to 7.2-8.5 with ammonia water, and the reaction is completed.