Use of Recycled PVB as a Protection against Carbonation

The paper is focused on testing of the poly(vinyl butyral) (PVB) layer which had the function of a CO2 insulating protection against concrete and mortar carbonation. The barrier efficiency of PVB was verified by the measurement of diffusion characteristics. Two different types of PVB were tested; original extruded PVB sheet and PVB sheet made from PVB dispersion which was obtained from recycled windshields. The work deals with the testing CO2 diffusion when polymer sheets were exposed to a CO2 atmosphere (10% v/v CO2) with 0% RH. The excellent barrier capability against CO2 permeability of original and also recycled types of PVB layers was observed. This application of PVB waste can bring advantageous use in civil engineering and significant environmental contribution

Use of Recycled PVB as a Protection against Carbonation

The paper is focused on testing of the poly(vinyl butyral) (PVB) layer which had the function of a CO2 insulating protection against concrete and mortar carbonation. The barrier efficiency of PVB was verified by the measurement of diffusion characteristics. Two different types of PVB were tested; original extruded PVB sheet and PVB sheet made from PVB dispersion which was obtained from recycled windshields. The work deals with the testing CO2 diffusion when polymer sheets were exposed to a CO2 atmosphere (10% v/v CO2) with 0% RH. The excellent barrier capability against CO2 permeability of original and also recycled types of PVB layers was observed. This application of PVB waste can bring advantageous use in civil engineering and significant environmental contribution

Acid Attack on Cement Mortars Modified with Rubber Aggregates and EVA Polymer Binder

The acid attack on cement mortars modified with rubber aggregates and EVA polymer binder was studied. Mortar specimens were prepared using a type CEM I 42.5 Portland cement and siliceous sand, as well as by substituting 25% of sand with shredded used automobile tires, and by adding EVA polymer in two percentages (5% and 10% of cement mass). Some specimens were only air cured, at laboratory conditions, and their compressive strength and water absorption were determined. The rest specimens were stored in acid solutions (HCl, H2SO4, HNO3) after 28 days of initial curing, and stored at laboratory temperature. Compressive strength tests, mass measurements and visual inspection took place for 28 days. Compressive strength and water absorption of the air-cured specimens were significantly decreased when rubber aggregates are used. The addition of EVA polymer further reduced water absorption, while had no important impact on strength. Compressive strength values were affected in a greater extent by hydrochloric acid solution, followed by sulfate and nitric acid solutions. The addition of EVA polymer decreased compressive strength loss for the specimens with rubber aggregates stored in hydrochloric and nitric acid solutions. The specimens without polymer binder showed similar mass loss, which was higher in sulfate acid solution followed by hydrochloric and nitric acid solutions. The use of EVA polymer delayed mass loss, while its content did not affect it significantly

PVB Sheet Recycling and Degradation

Possibility and conditions for optimal re-processing of plasticized poly(vinyl butyral) (PVB) were tested. The aim of the work was to determine degradation of PVB sheet at different kneading conditions and to estimate an influence of temperature, air oxygen content and mechanical stress on the course of degradation process. In order to confirm the influence of humidity on the PVB properties during reprocessing, the sheets with the humidity content of 0.5 and 8.0 % were tested. The PVB degradation was determined from the changes of melt flow index, mechanical properties in terms of stress at break and strain, yellowness and molecular weight distribution. The optimal re-processing conditions for PVB were estimated from the evaluation of all the studied properties and their changes.P(ED2.1.00/03.0111

Use of Recycled PVB as a Protection against Carbonation

The paper is focused on testing of the poly(vinyl butyral) (PVB) layer which had the function of a CO2 insulating protection against concrete and mortar carbonation. The barrier efficiency of PVB was verified by the measurement of diffusion characteristics. Two different types of PVB were tested; original extruded PVB sheet and PVB sheet made from PVB dispersion which was obtained from recycled windshields. The work deals with the testing CO2 diffusion when polymer sheets were exposed to a CO2 atmosphere (10% v/v CO2) with 0% RH. The excellent barrier capability against CO2 permeability of original and also recycled types of PVB layers was observed. This application of PVB waste can bring advantageous use in civil engineering and significant environmental contribution

Use of Recycled PVB as a Protection against Carbonation

The paper is focused on testing of the poly(vinyl butyral) (PVB) layer which had the function of a CO2 insulating protection against concrete and mortar carbonation. The barrier efficiency of PVB was verified by the measurement of diffusion characteristics. Two different types of PVB were tested; original extruded PVB sheet and PVB sheet made from PVB dispersion which was obtained from recycled windshields. The work deals with the testing CO2 diffusion when polymer sheets were exposed to a CO2 atmosphere (10% v/v CO2) with 0% RH. The excellent barrier capability against CO2 permeability of original and also recycled types of PVB layers was observed. This application of PVB waste can bring advantageous use in civil engineering and significant environmental contribution

Use of Recycled PVB as a Protection against Carbonation

The paper is focused on testing of the poly(vinyl butyral) (PVB) layer which had the function of a CO2 insulating protection against concrete and mortar carbonation. The barrier efficiency of PVB was verified by the measurement of diffusion characteristics. Two different types of PVB were tested; original extruded PVB sheet and PVB sheet made from PVB dispersion which was obtained from recycled windshields. The work deals with the testing CO2 diffusion when polymer sheets were exposed to a CO2 atmosphere (10% v/v CO2) with 0% RH. The excellent barrier capability against CO2 permeability of original and also recycled types of PVB layers was observed. This application of PVB waste can bring advantageous use in civil engineering and significant environmental contribution

Problems of recycling PVB sheet used for production laminated safety glass

Měkčené polyvinylbutyralové (PVB) fólie se používají pro výrobu laminovaných bezpečnostních skel. Fólie má za úkol slepit dvě, případně více skel navzájem, čímž vznikne výborná mechanická odolnost laminátu. Díky tomu automobilové sklo utlumí náraz hlavy při nehodě a součastně nedojde k uvolnění střepin, které při použití kalených skel poraní cestující osoby. Článek popisuje různé zdroje PVB fólie, které vznikají v průběhu jejího zpracování. Ty poskytují odpadní polymer pro opětovné přepracování, přičemž se text podrobněji zabývá fólií z recyklovaných automobilních skel. Rekuperát, tedy polymer získaný separací od skla z autoskel se dosud nevyužívá k přepracování na novou fólii o stejných vlastnostech, jako původní produkt. Studie se zabývá spojením možnosti recyklace PVB z autoskel a jejího opětovného zpracování na fólii novou.Publication of the patent on silica fi lled tread compound took the tire industry by surprise. Improved rolling resistance was claimed, without reducing other critical tire properties such as dry and wet grip and wear. In attempting to duplicate this technology, many companies experienced diffi culties in the mixing control of tire compounds containing high level of silica. The chemical reactions, which must be achieved in mixing, may have a detrimental effect on compound fi nal properties and compound process ability. They are highly sensitive to mixing conditions, such as temperature

Contribution to assesing cross-linking of protein hydrolyzate with diepoxides

Bylo studováno sítování hydrolyzátu kolagenu diepoxibutanem nebo (oktanem) při 25oC. Optimální pH pro sítování bylo 9. Rozpustnost vzorku klesala úměrně s množstvím použitého sítovadla. Pro stanovení limitního viskozitního čísla je optimální měřit viskozity vzorku v 1M KCl roztoku. Diepoxyoktan byl účinnější sítovadlo než diepoxybutan. V IR spektrech se sítování projevilo slabě a jen při použití diepoxyoktanu.Colagen hydrolyzate was crosslinked with diepoxibutane or (octane) at 25oC. Suitable conditions for crosslinking were found at pH = 9. Solubility of samples decreased proportionately with increasing concentration of crosslinking agent. Viscosity measurements yielded best results for estimation of intrinsic viscosity in 1M KCl solution. Diepoxyoctane was better crosslinking agent than diepoxybutane. In IR spectra crosslinking demonstrated only weakly with diepoxyoctane