The Synthesis And Application Of Macromolecule Surface Modifier Used For Sericite Wet Processing

Sericite filler belong to slice layer natural mineral material with low prices, as inorganic filler added to polymers can reduce the cost of production, and has properties of reinforcing, improve the barrier, heat-resistant, insulation and UV resistance aging performance. In order to improve the sericite in processed into filler sliced and refining the stripping effect, at the same time require to realize the organic coated of sericite powder, to improve the compatibility with organic polymer, and improve its filling modification effect in plastic, rubber, paint products, we design macromolecules and synthesize the new macromolecular surface modifier which can achieve the above technical requirements. We declare a invention patent, woning the authorization(<A Kind of Macromolecular Surface Modifier and Surface Modified Sericite and Application>), and the patent number is 200910116375.3.According to the specific requirements of the sericite in wet grinding and peeling into powder, and the polymer structure, properties and use of filled modification, the design of macromolecular surface modifier should have the following molecular structure characteristics:Firstly, the design of anchorage, which more firmly in filler particle adsorption, prevents the separated of macromolecules dispersant and filler in aqueous media groups; anchorage is used through the ionic, or covalent bond, or hydrogen bonding and van der Waals key etc.Secondly, the design of the flexible chain section has good compatibility with dispersed medium. This chain can take shape of a structure of more stretch, which formed as protective conformation on the surface of filler particles. It's useful for the sliced into flour peel with refined in the machining process, and then it requires certain compatibility with polymer matrix to improve it in the dispersion of the matrix.In this article, we research specific application of the sericite powder by self-designed synthetic macromolecular surface modifier. We make the intact sericite powder and treatment of sericite powder separately into the EPDM and NBR rubber to prepare for modified rubber composites, to research and compare their impact on the performance. As electronic level packing, sericite is added to copper clad in insulation substrate. On the premise of reach the basic performance requirements of electrical, mechanical, flame retardant, to study the silica powder electronic of high grade alternative price, and to reduce the feasible of productive cost.There are three chapters constitute the thesis:The first chapter is the introduction which presents the research of sericite added in polymer materials and the frequently used inorganic filler and their surface modification methods. Finally, the design of the whole paper is advanced.The second chapter is the research of the Synthesis and Characterization of Macromolecule dispersant PEG400-MAH-PAA. Through the study of the surface structure characteristics of sericite, it was found that there are many reactive groups on the surface of sericite. A new hydrosoluble macromolecular dispersant and modifier, poly(ethylene glycol)-poly(maleic anhydride)-poly(acrylic acid) (PEG400-PMAH-PAA) block copolymer was synthesized via ring-opening reaction and free radical polymerization, which used to be surface modification by inorganic filler with Si-OH. The reaction contents two steps that PEG400-MAH is synthesized first and then PEG400-MAH-PAA is synthesized by double bonds'introduction at the end of molecular. The chemical structure of the PEG400-PMAH-PAA block copolymer was confirmed by FTIR and NMR. The product's Mn and Mw are 3050 and 3979,so d=1.302. Its thermal stability was contented the application in the polymer materials because the decomposition temperature is higher than 200℃. Its average molecular weight which was determined by GPC was suitable for modifying the inorganic fillers. Using the method of FTIR,TGA,TEM analyzed BA-VTES-SSS, which was synthesized by laboratory, we can conclude that the molecular'structure correspond to the design of macromolecular.The third chapter is the research of surface modification of sericite and its application in rubber and copper-clad plate (CCL). That was provided with theoretical basis for the surface modification and the design of macromolecule dispersant. It was chemical cladding that the modified sericite was coated by the macromolecule dispersant.Its effect is better and the modified sericite has a better dispersity in water. The compatibility between sericite and NSBR was improved when sericite was modified by macromolecule dispersant.The dispersity of sericite in rubber and the thermal stability of rubber was also improved. Compared the modified sericite with the original sericite which was added to NR/SBR rubber, the former has an obvious reinforce effect on rubber. The mechanical data of the different ratio of additive indicate that 9% add ratio has a best reinforce to rubber. Compared with Light calcium carbonate, sericite has a better reinforce effect on rubber. Macromolecule dispersant has a better modified effect on sericite than coupling agent. The polarity of macromolecule dispersant is very strong. For larger polarity rubber, the reinforcing effect is fine, but for weaker polarity rubber it's poor and even makes the mechanical property decrease. Modified sericite by BA-VTES-SSS can improve dispersion of sericite in water, and added to the EPDM can improve the mechanical properties and electricity insulation properties of clay-rubber composites. Sericite adds to CCL, each properties can reach the standard of IPC4101-98.This shows that sericite possesses application prospect in CCL industry.