Development of Waste Polystyrene Foam Plastic Recycled Adhesive

3.2.6 Effect of Reaction Temperature on Adhesive Properties

The effect of polymerization graft temperature on the reaction is shown in Table 6.

If the temperature is too low, the initiator cannot be initiated and the energy required for the reaction does not meet the requirements. Therefore, the copolymerization cannot be well grafted. When the temperature is too high, the reaction is too severe, and at the same time, the heat generated by the reaction may lead to polymerization. Degradation of styrene, the most suitable reaction temperature is 75-85 °C.

3.2.7 Effect of Insulation on Monomer Conversion Rate

Emulsion graft polymerization should be carried out by continuous feeding. Heating and heat preservation should be performed after the end of feeding. The conversion rate increases with the holding time, but it can be seen from Table 7 that the general conversion of the monomer is completed after 0.5 h of incubation.

3.2.8 type and amount of emulsifier

Emulsion copolymerization generally uses an anionic-nonionic surfactant as the emulsifying system, anionic surfactant is sodium lauryl sulfate, nonionic surfactant is OP-10, and the ratio is 1:2. Table 8 shows emulsification. The amount of agent on the quality of glue.

From the data in the table, it can be seen that the amount of emulsifier is between 2% and 3%. When it is less than 2%, the latex has agglomeration and the emulsification effect is not good. When it is more than 3%, the polymerization reaction speed is fast and the emulsion may be It is due to the large and unstable particles.

3.2.9 Cost Accounting of PS Modified Latex

The cost of the latex prepared by the method is as follows: The price of the adhesive thus prepared is 1.84 yuan per kilogram, and the price is 3680 yuan per ton, which is much easier than the commercially available milky white glue. Moreover, this is the price of the laboratory reagent, industrial production. About 800 yuan per ton. Therefore, this modified PS emulsion is still very industrial value.

4 Conclusion

In the development of solvent-based PS modified adhesives, the use of epoxy resin as a modifier was first proposed for the modification of polystyrene foam and succeeded. The resulting adhesive's tensile shear strength (aluminum sheet) can be improved. Up to 6.2MPa, can be used as a non-structural adhesive for bonding metal. For glass, ceramic products, plastic products, wood and other bonding effect is better.

The latex obtained by graft copolymerization of butyl acrylate and vinyl acetate mixed monomer and polystyrene foam can achieve a compressive shear strength of 10.4 Mpa, which can completely replace the commercially available white glue for wood sticking. Then. In this kind of modified emulsion glue, the waste of polystyrene foam accounted for 21% and the mixed monomer accounted for 8.5%, which not only saved the cost, but also recovered the white pollution. It is a double-edged method. At present, there is a large demand for domestic white glue. This glue production process is simple, the equipment investment is small, and the secondary pollution is not great. It is a result worthy of industrialization.

(Author/Bao Chunyang Heilongjiang Institute of Petroleum Chemistry)


Chemistry and Adhesion