Industrial Preparation Of Copolymers Produced By In Situ Chlorinating-Graft Copolymerization And Their Development Of Applications

The purpose of this message is to study industrial preparation of PE copolymers produced by in situ chlorinating-graft copolymerization and their development of applications. Some performance test were implemented on PE copolymers produced by in situ chlorinating-graft copolymerization, and some comparation between them and commodity CPE was done for the discussion about usability of industrial productions. The development of applications of PE copolymers produced by in situ chlorinating-graft copolymerization was expounded from aspects of adhesive and toughness modifiers.Solid-phase reaction of in-situ chlorinating graft copolymerization was proceeded in a agitated reactor (2m3), and 2-hydroxy ethyl arylate(HEA), butyl acrylate(BA) and maleic anhydride(MAH) were grafted onto polyethylene(PE) respectively as chlorinated reaction. The notch impact strength of graft copolymers (CPE-cg-HEA and CPE-cg-BA)was increased by a wide margin,and their hardness was reduced observably, on the basis of keeping the tensile strength(CPE's strength). The properties of industrial graft copolymer CPE-cg-HEA is the same as CPE-cg-BA, but they are not good as laboratory production. The reaction temperature should be increased at the second section. Although the branch of HEA or BA was inserted ,the in situ chlorinating-graft copolymers have the same processability as commodity CPE. The graft degree of copolymer in which MAH are grafted onto HDPE (PE-cg-MAH)can be higher than 1.2%(wt%), and PE-cg-MAH could be used in every filed of plywood as a kind of formaldehyde-free adhesives.In the applications of industrial products, we discussed the process of extrusive systems in which toughening modifiers were CPE-cg-HEA and CPE-cg-BA. We characterized the mechanical properties and compatibility of different systems with the toughening modifiers were CPE-cg-HEA, CPE-cg-BA and CPE. The conditions of alloying process were discussed, including simple and dispersive alloying. The effect to the mechanical properties of alloying system without each assistant. As the result displayed, in the process of high-speed knead, the best work condition is kneading at 80℃for 5 minutes. The blending effect is the best when the frequency ratio of GZV and main engine is 10 to10. The extrusive system without CaCO3 has the better mechanical properties than quondam system. The blends without surfactant would be flavescence when it was hot-pressed. The toughening effect of CPE-cg-HEA,CPE-cg-BA and CPE are remarkable, but CPE-cg-HEA is the best choice when considered the respect of keeping tensile strength.The water-absorbed swelling ratio of plywood used PE-cg-MAH as adhesive is lower than plywood used HDPE as adhesive. The higher the dosage of adhesive, the bigger the shear strength,once the dosage of adhesive was above 180g/m2, the curve of bond strength would tend to flatten. The hot-press process condition of PE-cg-MAH as plywood adhesive is 160-170℃and 5min.