Wyniki wyszukiwania - BazTech

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Wpływ antypirenów fosforowych na palność pianek poliizocyjanurowych

Mizera Kamila, Celiński Maciej, Kozikowski Paweł, Borucka Monika, Przybysz Jan, Agnieszka Gajek

Przemysł Chemiczny

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2023

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T. 102, nr 1

84--90

PL

Omówiono fosforowe środki ograniczające palność stosowane w piankach poliizocyjanurowych, które stanowią jeden z najbardziej popularnych rdzeni płyt warstwowych stosowanych w termoizolacji. Przedstawiono wyniki badań palności nowo opracowanych związków o potencjalnym działaniu ograniczającym palność. Badania przeprowadzono z wykorzystaniem kalorymetru stożkowego, komory do badania dymotwórczości oraz aparatu do pomiaru indeksu tlenowego. Wykonano również badania charakteryzujące zwęgliny otrzymane po spaleniu w kalorymetrze stożkowym. Dodatkowo wykonano analizę termiczną środków zmniejszających palność oraz wytworzonych z ich udziałem pianek.

EN

Four polyisocyanurate foams differing in the type of addn. of flame retardants (BPO₄, 4-amino-1,2,4-triazole phosphate, (NH₄)B₅O₈ or ammonium polyphosphate) were prepd. Their fire parameters, oxygen index, apparent d., and thermal and SEM anal. were detd. The use of BPO₄ was beneficial in terms of reducing the flammability and smoke ability of the tested materials.

2

The Effect of the Aging Process on Selected Properties of Polypropylene Modified by Natural Fillers

Samujło Bronisław

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 4

139--147

EN

The purpose of the research was to determine the aging-induced changes in the selected mechanical properties and flammability of polypropylene modified with natural fillers (sunflower husk, wheat bran, pine sawdust and talc). The fillers were introduced into polypropylene in a mechanical mixing process (weight content 20%). The samples were obtained with the use of an Allrounder 320 C500–170 laboratory injection molding machine. The aging process under artificial sample conditions was carried out in the laboratory chamber (aging time of 0, 60, 120, 240, 360 hours). The tests of the mechanical properties included the measurements of hardness, impact strength and tensile strength. The flammability tests were carried out with a vertical and horizontal alignment of the sample according to the PN-EN 60695–11–10 standard. As a result of the research, a significant impact of the introduction of natural fillers in the form of sunflower husks, wheat bran and pine sawdust on the selected properties of polypropylene was demonstrated. A large decrease in the impact toughness, a relatively small decrease in the short-term tensile strength as well as an increase in the elastic modulus and stress at rupture caused by the introduction of the natural fillers mentioned, were found. A beneficial effect was the relatively small impact of aging on the mechanical properties and flammability of the modified polypropylene fillers.

3

Comparative Analysis of Peat Fibre Properties and Peat Fibre-Based Knits Flammability

Mikucioniene Daiva, Cepukone Lina, Salmeia Khalifah A., Gaan Sabyasachi

Autex Research Journal

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2019

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Vol. 19, no. 2

157--164

EN

A very promising cellulose-based natural fibre that is suitable for use in the textile industry is peat fibre. This fibre is a by-product of peat excavation, purified by separating it from other components. In this study, the morphological, chemical and mechanical properties of peat fibres as well as flammability of peat-based knitted fabrics were analysed. The average diameter of the peat fibres is ~60 μm, but it varies in very wide ranges – 25–150 μm; however, the number of fibres with diameter more than 100 μm is very low. As the peat fibre contains a high amount of lignin, lignin amount in the mixed peat/cotton yarn is relatively high too. Lignin is responsible for enhanced flame retardancy; therefore, time to ignition of the peat knit is ~30% higher than that of the cotton knit. Consequently, peat fibre can be used in the knitted structure in order to significantly reduce its flammability. In order to increase the flame retardancy, the knits have been treated by flame retardant in various concentrations. It was found that around the burned hole on the peat knit, treated by very low concentration flame retardant, forms charred area and the knit stops to burn even if the flame source is not removed.

4

Wykorzystanie recyklatu poliwęglanowego do otrzymywania sztywnych pianek poliuretanowo-poliizocyjanurowych

Czupryński B., Liszkowska J., Paciorek-Sadowska J.

Ekologia i Technika

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2003

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R. 11, nr 1

8-13

EN

The possibilities of polycarbonate recyclate application as a filler for rigid polyurethane-polyisocyanurate foams (PUR-PIR) have been studied. Waste polycarbonate originating from Marine Equipment Factory FAMOR in Bydgoszcz was milled on grinding mill equipped with sieves and then it was added to foam composition in the amounts from 5% to 30% w/w with respect to the total amount of polyisocyanate and oligomerol. Seven foam samples with various content of polycarbonate recyclate were obtained by the above method. The diameter of the granulated product was 2mm. The parameters of processing were measured during the synthesis. The following physicochemical properties have been determined: apparent density, change of linear and volume dimensions, mass decrement, softening point, brittleness, compressive strength, residue after combustion. It was found that foam density, compressive strength and residue after combustion increased, whereas brittleness and softening point decreased as the content of granulated product was increased in foam composition. The changes of linear and volume dimensions as well as weight decrement of foams after 48 hours of thermostating at 393K are practically independent of the content of polycarbonate granulated product. Our studies prove that the waste polycarbonate recyclate can be applied as the filler for the rigid polyurethane-polyisocyanurate foams.