Myronyuk O. Formation of dense thin-layer structures in polymer-alumosilicate-carbonate system

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0411U005009

Applicant for

Specialization

  • 05.17.06 - Технологія полімерних і композиційних матеріалів

23-06-2011

Specialized Academic Board

Д 26.002.24

Publishing and Printing Institute of Igor Sikorsky Kyiv Polytechnic Institute

Essay

Object of research is the structure and barrier properties of protective thin-layer polymeric compositions. The work purpose is working out of physical and chemical bases of formation of dense structure of coatings of barrier type for the account of realisation of potential possibilities of fractionated layered alumoisilactes and carbonates. Methods of research and equipment: ik-spectroscopy (spectroscope Specord - 75), scanning electronic microscopy (microscope Selmi 106), xray analysis (x-ray spectrometer ДРОН-3), viscosimetry (rotational viscosimeter Rheotest-2 and capillary ВПЖ-3), electrochemical researches (the bridge of alternating current Р3505). Theoretical and practical results: It is stated, that reception of considerably condensed systems of fillers can be carried out by realisation of principle of discret granulometrical distributions in mixed alumosilikate-carbonate two-and three-component systems. It is shown, that for three-component systems of fillers on a basis of fractioned chalk (d50 % = 25 microns), chalk МТД-20 (d50 % = 2,78 microns) and prosyan kaolin (d50 % = 1,20 microns) are reached value of porosity at level 18 about. %. Thus, reception of the condensed structure is reached by mechanical hashing, without necessity of an additional grinding. 2. It was established, that the surface chemical compound карбонатных materials is defined by the maintenance of some chemical groups with the raised reactionary ability (-S=O, Sa, Мg-OH), at the same time alumosilicates are characterised by presence less reactionable groups (-Si-OH, =Al-OH точто). It defines change in a raw - grinded marble - dolomite - wallastonite - kaoline prosyan - kaolin gluchovetsky - talc, that is defining the corresponding reduction of hydrophility factor of surfaces of the fillers from 0,90 to 0,23. Besides, in a raw the essential increase in values of a specific surface is observed: from 1,4 m2/g at Normcal 20 to 12,0 m2/g at prosyan kaolin. 3. On the example of polymers of different reaction ability it is shown that interaction with a surface of fillers is specific, for example carbonates form stronger communication with carboxy group in structure of styrenebythylmethacrylate polymer, than silicates; silicates - stronger with phenyl as a part of both polymers in comparison with carbonates. Thus, adsorbtion ability of the fillers in relation to polymers from a solution is mainly defined by the factor of development of a surface and, accordingly increases from Normcal 20 (And = 94 mg/g); to prosyan kaolin (A = 201 mg/g). 4. It is shown, that decrease in quantity of polymer adsorbed on a surface of the filler to 30 - 40 % can be carried out by liophilization by siloxane substances. More essential decrease of adsorption ability of a surface (to 2,5-3 times) is thus reached at increase of thermodynamic compatibility of solvent with polymer. 5. It is established, that effective increase of barrier ability of thin-layer coatings by the increase in values of critical volume concentration for the account of reduction of specific free volume of filler system and quantities of polymer in an interphase layer. Use of two-componental systems of the fillers allows to reduce the permeability of coatings to 2,1 times in comparison with unicomponent, three-componental - to 5,1 times. Corresponding analytical dependence which allows to estimate value of critical concentration of filler with accurasy of prediction ± 3 vol. % is recieved and, accordingly, the minimum possible value of permeability of a composition can be calculated. 6. It is shown, that additional introduction in composition structure of exfoliated montmoryllonite allows to increase density of structure of a protective film and, accordingly, increase its barrier properties to 7,4 times in comparison with existing systems on the basis of talc. Scientific novelty: 1. For the first time the conditions reception of dense structures thin-layer compositions on the basis of alumosilicate and carbonate fillers with the account of a geometrical configuration of particles and their distributions are formulated. 2. It is experimentally proved that essential increase of density, barrier and mechanical properties of coatings of system polymer-alumosilicate-carbonate is reached for the introduction account in their structure of exfoliated montmoryllonite. 3. On an example of polymers of different chemical activity: styrenebythylmethacrylate and siloxane laws of process of formation of structure of an interphase layer polymer-filler with the account of development and a power condition of a surface of the fillers are investigated. 4. For the first time influence of thermodynamic compatibility of system polymer-solvent on the processes of formation of a microstructure of a coating, its density, protective and operational properties is estimated. 5 The complex approach to creation thin-layer compositions polymer-alumosilicate-carbonate with the maximum degree of consolidation of structure is developed. On its basis it is developed numbers of coatings of anticorrosive appointment. Introduction degree: By results of researches the barrier coating system was developed (the patent of Ukraine on № UA 40132), a technique and the device for definition of lyophilic properties of disperse materials was developed (the patent of Ukraine № UA 51188) and the corresponding specifications and technical documentation was developed. On the basis of enterprise "Колоран" the trial party of weatherproof enamel with increased barrier properties in quantity of 20 tons according to the Specifications developed earlier, was made. Protective efficiency of enamel proves to be true by the certificates of introduction and experimental batch tests.

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