Evaluating the use of calcium hydrogen phosphate dihydrate as a mineral‐based fire retardant for application in melamine‐urea‐formaldehyde ( MUF )‐bonded wood‐based composite materials

2021 ◽  
Author(s):  
Tomasz Ozyhar ◽  
Christof Tschannen ◽  
Heiko Thoemen ◽  
Justin O. Zoppe
Keyword(s):  
Composite Materials ◽  
Urea Formaldehyde ◽  
Fire Retardant ◽  
Hydrogen Phosphate ◽  
Phosphate Dihydrate ◽  
Wood Based Composite

scholarly journals Fabrication of Carbonate Apatite Block through a Dissolution–Precipitation Reaction Using Calcium Hydrogen Phosphate Dihydrate Block as a Precursor

Materials ◽  
2017 ◽  
Vol 10 (4) ◽  
pp. 374 ◽  
Author(s):  
Kanji Tsuru ◽  
Ayami Yoshimoto ◽  
Masayuki Kanazawa ◽  
Yuki Sugiura ◽  
Yasuharu Nakashima ◽  
...  
Keyword(s):  
Precipitation Reaction ◽  
Carbonate Apatite ◽  
Hydrogen Phosphate ◽  
Phosphate Dihydrate

scholarly journals Preparation and evaluation of an ispaghula based directly compressible matrixing agent for controlled release

2008 ◽  
Vol 58 (3) ◽  
pp. 309-316 ◽  
Author(s):  
Anita Lalwani ◽  
Jolly Parikh
Keyword(s):  
Controlled Release ◽  
Hydroxypropyl Methylcellulose ◽  
Hydrogen Phosphate ◽  
Lattice Design ◽  
Phosphate Dihydrate ◽  
Simplex Lattice Design ◽  
Dependent Variables ◽  
Simplex Lattice ◽  
Preparation And Evaluation

Preparation and evaluation of an ispaghula based directly compressible matrixing agent for controlled releaseThe objective of the present investigation was to prepare and evaluate an ispaghula husk based directly compressible (DC) adjuvant that can be used as matrixing agent using an agglomeration technique. Addition of hydroxypropyl methylcellulose was found necessary to improve cohesion. Lactose (X1), calcium hydrogen phosphate dihydrate (X2) and Avicel PH101 (X3), used along with ispaghula in preparation of agglomerates, were selected as three independent variables in a simplex lattice design affecting compressional and dissolution characteristics of the drug from the DC adjuvant. The agglomerates were evaluated for their flow properties. Tablets were prepared using 70% agglomerates and 30% acetaminophen, a poorly compressible drug, and were subjected toin vitrodrug release study. Amounts of the drug released at the end of 60 min (Y60), 300 min (Y300) and 480 min (Y480) were selected as dependent variables in a simplex lattice design. Batch IH05 that contained lactose and calcium hydrogen phosphate dihydrate in a 1:2 ratio could control the release for 12 hours and thus form the basis for twice a-day-dosing.

scholarly journals Wood-based composite materials for ultralight lens antennas in 6G systems

2022 ◽  
Author(s):  
Mikko Kokkonen ◽  
Mikko Nelo ◽  
Henrikki Liimatainen ◽  
Jonne Ukkola ◽  
Nuutti Tervo ◽  
...  
Keyword(s):  
Composite Materials ◽  
Wireless Communication ◽  
Communication Systems ◽  
Wireless Communication Systems ◽  
The Internet ◽  
Low Loss ◽  
High Frequencies ◽  
Lens Antennas ◽  
Wood Based Composite

Extremely high frequencies used in future wireless communication systems such as 6G require low loss materials to avoid wasting power and maintain acceptable efficiency . Furthermore, especially in the internet...

scholarly journals ПРИДАНИЕ ОГНЕЗАЩИТНЫХ СВОЙСТВ ЦЕЛЛЮЛОЗНЫМ ТЕКСТИЛЬНЫМ МАТЕРИАЛАМ С ПРИМЕНЕНИЕМ ЗОЛЬ - ГЕЛЬ ТЕХНОЛОГИИ

2019 ◽  
pp. 365-372
Author(s):  
Bijamal Raimovna Tausarova ◽  
Anastasiya Yur'yevna Stasenko
Keyword(s):  
Heat Treatment ◽  
Flame Retardant ◽  
Sodium Silicate ◽  
Ignition Time ◽  
Fire Retardant ◽  
Hydrogen Phosphate ◽  
Sodium Hydrogen Phosphate ◽  
Sodium Hydrogen ◽  
Fire Retardant Properties ◽  
Flame Retardant Properties

The article presents studies on the use of a new composition based on sodium silicate, urea and sodium hydrogen phosphate to impart fire-retardant properties to cellulosic textile materials. The influence of the concentration of the starting components, temperature, and heat treatment time on the flame retardant properties was studied. The change in the fire retardant properties of cotton fabric is given for three heat treatment modes: at 80, 90 and 100 °C. Compared to the initial fabric, the samples treated with a flame retardant have indicators of flame retardant properties. Untreated fabric with a size of 220×170 mm when tested for flammability at an ignition time of 15 s completely burns out in 60 s. In samples treated with a flame retardant, at an ignition time of 15 s, the smoldering time is practically reduced to zero. With an increase in the concentration of the flame retardant, and the temperature of the heat treatment, the loss of material strength, breaking load, and the appearance of the fabric change slightly. Using electron scanning microscopy and energy dispersive microanalysis, it was shown that pure cotton fabric contains 68.77% carbon and 31.22% oxygen; after modification, particles of sodium – 0.02%, phosphorus – 0.04% and potassium – 0.05% are formed on the surface of the treated fabric. distributed fairly unevenly. It has been shown that in cellulosic materials modified with compositions based on sodium silicate and urea, sodium hydrogen phosphate, flame retardant properties increase. The proposed composition provides the achievement of higher fire resistance. Processing can be carried out on standard equipment of finishing enterprises without the stage of high-temperature fixation of the drug.

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