Physico-mechanical characteristics and phase composition of unburned periclase-carbon refractories on modified phenol-formaldehyde resin

2019 ◽  
pp. 29-33
Author(s):  
D. A. Brazhnik ◽  
G. D. Semchenko ◽  
G. N. Shabanova ◽  
E. E. Starolat ◽  
I. N. Rozhko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Phase Composition ◽  
Mechanical Characteristics ◽  
Carbon Materials ◽  
Phenol Formaldehyde ◽  
Phenol Formaldehyde Resin ◽  
Ethyl Silicate ◽  
Ammonium Citrate ◽  
Formaldehyde Resin

The possibilities of improving the physico-mechanical properties of periclase-carbon materials by modifying the phenol-formaldehyde resin (PFR) with organoinorganic complexes are described. The composition of the modifying additives, the phase composition of the materials after the PFR hardening are given, the influence of modifiers on the formation of the structure of materials is established. It is shown that the introduction of ethyl silicate or hydrolyzed ethyl silicate into liquid PFR during preparation of the charge contributes to the formation of SiC in the phase composition. The conclusion is made about the rationality of the introduction of ethyl silicate in an amount of from 0,66 to 1 wt. % and the prospects of introducing nickel oxalate into a liquid PFR together with ammonium citrate to increase the compressive strength of periclase-carbon materials up to 60 MPa. Ill. 7. Ref. 9.

scholarly journals Synthesis, Characterization and Mechanical Evaluation of the Phenol-Formaldehyde Composites

2008 ◽  
Vol 5 (s1) ◽  
pp. S1015-S1020 ◽  
Author(s):  
B. S. Kaith ◽  
Aashish Chauhan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Compressive Strength ◽  
Modulus Of Elasticity ◽  
Phenol Formaldehyde ◽  
Phenol Formaldehyde Resin ◽  
Modulus Of Rupture ◽  
Formaldehyde Resin ◽  
Physico Chemical

Phenol: formaldehyde ratio was varied in the synthesis of phenol- formaldehyde resin and used to prepare the composites. These composites were then evaluated for their mechanical strength on the basis of tensile strength, compressive strength and wear resistance. Composite with better strength was characterized by IR, SEM, XRD, TGA/DTA and further studies were carried out for its physico-chemical and mechanical properties like viscosity, modulus of rupture (MOR), modulus of elasticity (MOE) and stress at the limit of proportionality (SP)etc.

Novolak Type Phenol Formaldehyde Resin from Waste Brown-Rotted Wood

2011 ◽  
Vol 217-218 ◽  
pp. 490-494
Author(s):  
Gai Yun Li ◽  
Te Fu Qin
Keyword(s):  
Mechanical Properties ◽  
Phosphoric Acid ◽  
Thermal Property ◽  
Significant Influence ◽  
Phenol Formaldehyde ◽  
Product Yield ◽  
Flow Property ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Liquefied Wood

The waste brown-rotted wood was liquefied in phenol with phosphoric acid as a catalyst and the resulting liquefied products were condensed with formaldehyde to yield novolak liquefied wood-based phenol formaldehyde resin (LWF). The results showed that brown-rotted wood could be almost completely liquefied within 0.5 h at phenol to wood (P/W) ratio 2. An increase in P/W ratio from 2 to 3 slightly improved the flow property of LWF, but accompanied by decreasing the product yield from approximately 140 to 120 %. The increase of liquefaction time from 30 min to 60 min did not have a significant influence on the resulting LWF. The thermofluidity of LWF were compared to that of the commercial novolak PF resin, and could be used to make moldings with similar thermal property and mechanical properties to those obtained from the conventional novolak PF resin.

scholarly journals Self-adhesion X-ray Shielding Composite Material of EPDM Rubber with Barite: Mechanical Properties

2020 ◽  
Vol 57 (1) ◽  
pp. 28-36
Author(s):  
Vasiliy Cherkasov ◽  
Yuiy Yurkin ◽  
Valeriy Avdonin ◽  
Dmitriy Suntsov
Keyword(s):  
Mechanical Properties ◽  
Phenol Formaldehyde ◽  
Peel Strength ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Adhesion Properties ◽  
X Ray ◽  
Industrial Oil ◽  
Oil Concentration ◽  
Free Material

It is actual now to work out new radiation protecting sheeting on the basis of non-curing polymeric composition which possess self-adhesion properties, are easily mounted and dismantled and provide high tightness and low permeability. Mechanical properties of non-curing composites consisting of ethylene propylene diene monomer (EPDM), industrial oil (IO), alkyl phenol-formaldehyde resin (PF) with addition of barite (52 %) to the total material volume were investigated in this article. The aim of investigation is to find optimal content of the above mentioned components at which it would be possible to get the following properties: composite would be sticky enough (peel strength not less than 4 N/cm); character of a separation would be cohesive (on a material) and thus there would be no migration of softener and satisfactory resistance of fluidity. The results showed that PF addition till 20 % in the system EPDM/PF leads to the increasing of adhesive strength, in this case optimal oil concentration in the system EPDM/PF/IO is in the interval from 45 till 55 %. New self-adhesion lead-free material, exhibited higher X-ray-shielding properties, is also received in the result of investigation.

scholarly journals Tensile and Impact Bending Properties of Chemically Modified Scots Pine

Forests ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 84 ◽  
Author(s):  
Susanne Bollmus ◽  
Cara Beeretz ◽  
Holger Militz
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Bending Strength ◽  
Phenol Formaldehyde ◽  
Maximum Load ◽  
Solution Concentration ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Chemically Modified ◽  
Impact Bending

This study deals with the influence of chemical modification on elasto-mechanical properties of Scots pine (Pinus sylvestris L.). The elasto-mechanical properties examined were impact bending strength, determined by impact bending test; tensile strength; and work to maximum load in traction, determined by tensile tests. The modification agents used were one melamine-formaldehyde resin (MF), one low molecular weight phenol-formaldehyde resin, one higher molecular weight phenol-formaldehyde resin, and a dimethylol dihydroxyethyleneurea (DMDHEU). Special attention was paid to the influence of the solution concentration (0.5%, 5%, and 20%). With an increase in the concentration of each modification agent, the elasto-mechanical properties decreased as compared to the control specimens. Especially impact bending strength decreased greatly by modifications with the 0.5% solutions of each agent (by 37% to 47%). Modification with DMDHEU resulted in the highest overall reduction of the elasto-mechanical properties examined (up to 81% in work to maximum load in traction at 20% solution concentration). The results indicate that embrittlement is not primarily related to the degree of modification depended on used solution concentration. It is therefore assumed that molecular size and the resulting ability to penetrate into the cell wall could be crucial. The results show that, in the application of chemically modified wood, impact and tensile loads should be avoided even after treatment with low concentrations.

scholarly journals Optimization of properties of Eucalyptus oriented strand boards by specific gravity of panels

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
Thiago Souza da Rosa ◽  
Rosilani Trianoski ◽  
Setsuo Iwakiri ◽  
Ghislaine Miranda Bonduelle ◽  
Claudiney Do Couto Guimarães
Keyword(s):  
Mechanical Properties ◽  
Specific Gravity ◽  
Pinus Taeda ◽  
Inverse Relationship ◽  
Linear Models ◽  
Oriented Strand Board ◽  
Phenol Formaldehyde ◽  
Phenol Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Eucalyptus Species

This study aimed to determine the influence of specific gravity on properties of oriented strand boards produced with five Eucalyptus species and get linear models between the properties and the densification of the panels. The species studied were: Eucalyptus benthamii, E. dunni, E. grandis, E. saligna, E. urograndis and the mixture between them. The panels were produced with phenol formaldehyde resin and nominal densities of 0,65 g/cm³ and 0,75 g/cm³. The water absorption has an inverse relationship to the density of the panel. The relation between mechanical properties and specific gravity of the panel is directly proportional. The panels produced with the Eucalyptus species showed better properties than those produced with control species (Pinus taeda), except for tensile perpendicular. By means of linear models obtained in this study conditions for each species, it can estimate the specific gravity to produce oriented strand board panels that adequate the standard requirements.

scholarly journals Comparative Researcehs of the Properties of Laboratory Plywood and Some Industrial Manufactured Wood-Based Panels

2017 ◽  
Vol 2017 ◽  
pp. 258
Author(s):  
Violeta T Jakimovska
Keyword(s):  
Mechanical Properties ◽  
Phenol Formaldehyde ◽  
Pure Water ◽  
Physical And Mechanical Properties ◽  
Phenol Formaldehyde Resin ◽  
Water Soluble ◽  
Formaldehyde Resin ◽  
Master Thesis ◽  
Dry Pressing ◽  
The Impact

The aim of the researches in the master thesis is studying the impact of the changes in plywood structure on their physical and mechanical properties. These changes are related to the change of the layer’s position in the panels’ structure along the axis of symmetry without changing the number and the thickness of the veneers. Four models of laboratory nine layered plywood were made for studying this impact. The evaluation of the models quality was made on the base of the obtained values from the tests of their physical and mechanical properties, as well as on the base of the comparative analyze of these values and the values obtained from the tested properties of comparative model of industrial manufactured plywood. The laboratory plywood models are made in controlled laboratory conditions by the method of hot dry pressing. Beech peeled veneers with thickness of 1,2; 1,5; 2,2 and 3,2 mm are used for plywood manufacturing. As gluing component for plywood manufacturing, pure water-soluble phenol formaldehyde resin with concentration of 47,10 % is used. The models are preserved with phenol formaldehyde foil, which is impregnated in the surface layers during pressing. Four panels from each model are made, as well as two additional panels without surface phenol formaldehyde foil from the second model in order to perceive the differences in physical properties between preserved and non-preserved laboratory models.

Sign in / Sign up

Export Citation Format

Share Document