scholarly journals OPTIMIZATION OF CURING PROCESS FOR HIGH TEMPERATURE RESISTANT BINDER FOR POLYMER COMPOSITE MATERIALS

2017 ◽  
pp. 91-103
Author(s):  
Dmitriy Kiselkov ◽  
◽  
Aleksei Slobodinyuk ◽  
Tamara Oschepkova
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Curing Process

Regulation of Mechanical Properties of Advanced PCM Products with the Aid of Catalysts

2020 ◽  
Vol 992 ◽  
pp. 415-420
Author(s):  
I.V. Zaychenko ◽  
V.V. Bazheryanu ◽  
A.G. Kim
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Temperature Gradient ◽  
Polymer Composite ◽  
Strength Properties ◽  
Polymer Composite Materials ◽  
Epoxy Binder ◽  
Curing Process ◽  
The Matrix

The article considers the problem of the effect of uneven curing caused by the temperature gradient across the thickness of the material on the anisotropy of the strength properties of polymer composite materials. The effect of catalysts on the curing of the epoxy binder EDT-69N, used for the manufacture of multilayer polymer composite materials, was studied. According to dielectric spectrometry, the accelerating effect of the selected compounds on the curing process of the EDT-69N epoxy binder during fiberglass molding has been proved. The possibility of controlling the curing process using catalysts to reduce the influence of the temperature gradient on the anisotropy of the strength properties of the matrix in the manufacture of polymer composite materials is shown.

Research of the Processes of Eliminating Warpage of Aviation Products Made of Polymer-Composite Materials Obtained by High-Temperature Molding

2021 ◽  
pp. 84-94
Author(s):  
V.I. Korolkov ◽  
E.N. Nekravtsev ◽  
K.S. Safonov ◽  
P.S. Ogurtsov ◽  
V.A. Oganesov ◽  
...  
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Polymer Composite ◽  
Room Temperature ◽  
Binder Content ◽  
Polymer Composite Materials ◽  
Central Layer ◽  
Product Surface ◽  
Weaving Pattern ◽  
Significant Factors

The article considers issues of identifying the causes and factors that have a significant impact on the occurring and development of the warping process in monolithic products made of polymer — composite materials (PCM) obtained by the method of multidirectional layering of uncured PCM — semi-finished product (prepreg) and subsequent high-temperature molding in an autoclave. Warping is understood as a defect of a PCM product in the form of distortion of its configuration (deformation) under stresses arising during the polymerization of the binder prepreg at a high temperature (1800C) and cooling the product to room temperature. Flat samples made of glass-based prepregs have been researched. The selecting schemes of equilibrium stacking of samples of monolithic panels has been carried out. The influence of the binder content in the prepreg on the deformations in non-equilibrium layouts of the panel samples has been evaluated. It is shown that the most significant factors influencing the occurrence of warpage of monolithic PCM panels are: the weaving pattern of the prepreg reinforcing base, the amount of binder deposited in the prepreg, the direction of stacking monolayers in the panel, the edge effect and the shape of the product surface. It was found that the warpage of the sample occurs along the direction of unbalanced shrinkage of the binder. For balanced stacking, compensation in the direction of binder shrinkage and symmetry with respect to the central layer are necessary; more binder in the prepreg reduces the amount of warpage, but only slightly. The development of constructive and technological recommendations based on the results obtained will lead to a reduction in the terms of development of PCM products.

scholarly journals Energy-saving technology of production of elements of building structures from polymer materials

2021 ◽  
pp. 41-48
Author(s):  
A.V. Kondratiev ◽  
О.О. Prontsevych
Keyword(s):  
Composite Materials ◽  
Energy Saving ◽  
Polymer Composite ◽  
Technological Process ◽  
Polymer Materials ◽  
Polymer Composite Materials ◽  
Gas Evolution ◽  
Curing Process ◽  
Structural Elements ◽  
Energy Saving Technology

Problem statement. At present, the increase in the efficiency of the technology for the production of composite structural elements is associated with high energy costs. In this regard, the implementation of ways to optimize the parameters of the technological process of manufacturing polymer composite materials is of great importance. The purpose of the article is to optimize the modes of impregnation and curing of thermosetting binders and polymer composite materials based on them in combination with the kinetics of gas evolution and control of all stages of the technological process. Results. An energy-saving technology for molding composite structural elements of buildings and structures has been developed, which provides a reduction in the duration of the curing process of polymer materials, depending on the type of binder. The technology makes it possible to control the speed and degree of curing of a thermosetting binder by changing the tangent of the dielectric loss angle and electrical conductivity. Scientific novelty and practical significance. The approach and the electrophysical method for optimizing the modes of impregnation and curing of composite products in combination with the control of all stages of the technological process have been further developed in relation to the elements of composite structures. The permissible values of the curing parameters have been established according to the optimized mode of a number of thermosetting binders: heating rates, isotherm temperatures, and holding time at them. At the same time, the achieved optimal curing times for binders BFOS, LBS-4, ENFB, 5-211B using the new technology is 2.4; 1.8; 3.0; 2.3; 2.0 and 1.2 times less than according to known technologies. The results obtained guarantee the quality of the resulting composite product and are recommended for accelerating the curing process of polymer materials. Keywords: optimization; technological regime; impregnation; curing; thermosetting binders; gas evolution; stage control

PROSPECTS OF THE PRODUCTION OF LARGE-SIZED AIRCRAFT PARTS FROM POLYMER COMPOSITE MATERIALS (review)

2021 ◽  
pp. 55-62
Author(s):  
V.A. Goncharov ◽  
◽  
P.N. Timoshkov ◽  
M.N. Usacheva ◽  
◽  
...  
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Vacuum Impregnation ◽  
Curing Process ◽  
Process Automation ◽  
Materials Development ◽  
Infusion Method ◽  
Technological Methods ◽  
Selection Of

Today wings for Boeing 787 and Airbus A350 aircraft are made of polymer composite materials in the form of prepregs based on carbon fiber, the blanks of which are molded in an autoclave. It is expected that by 2025–2030 will actively use the vacuum infusion method, which will require global research on the selection of binding and reinforcing materials, development of the vacuum impregnation and curing process, automation and development of new technological methods for laying out workpieces of parts, accelerating the process and shortening the cycle time.

Polymeric Composites for Filling Bone Cavities

2020 ◽  
Vol 869 ◽  
pp. 419-423
Author(s):  
Dina I. Fazylova ◽  
Lubov A. Zenitova
Keyword(s):  
Molecular Weight ◽  
Composite Materials ◽  
Polymer Composite ◽  
Maxillofacial Surgery ◽  
Polymeric Composites ◽  
Polymer Composite Materials ◽  
Low Molecular Weight ◽  
Curing Process ◽  
The Creation

Polymer composite materials (PCМ) based on low molecular weight siloxane rubber SKTN-A have been developed, which are supposed to be used as osteoplastic materials in maxillofacial surgery. The following materials were used as fillers for the creation of PCM: bentonite, sepiolite, wollastanite. The effect of the type and content of filler on the curing process and the properties of the resulting compositions was investigated.

scholarly journals Research of Formal-Kinetic Regularities of the Curing Process of Low-Viscosity Epoxy Binder

2019 ◽  
Vol 9 (2) ◽  
pp. 1168-1173
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Practical Significance ◽  
Epoxy Binder ◽  
Curing Process ◽  
Model Free ◽  
Low Viscosity ◽  
Formal Kinetic ◽  
Degree Of Curing

The expanding range of components intended for manufacturing products of polymer composite materials is often not accompanied by comprehensive information on the characteristics and recommended technological curing modes. The relevance and practical significance of this investigation are based on the need to predict rational technological modes for curing products of polymer composite materials based on the low-viscosity epoxy binder Etal-Inject-SLM, which is in demand in the manufacture of products from polymer composite materials by cold curing. The purpose of this investigation is to determine kinetic patterns, which allow for predicting the time and degree of curing of the low-viscosity epoxy binder Etal-Inject-SLM for various isothermal curing conditions. The method of differential scanning calorimetry was used to measure the thermal effect of the curing reaction of the Etal-Inject-SLM epoxy binder at various heating rates. Based on the experimental calorimetric data and using the model-free (non-prior) Friedman method, using the specialized software Netzsch Kinetics Neo, the parameters characterizing the formal kinetic laws of the curing process were calculated. This allowed for plotting isothermal and iso-conversion thermokinetic diagrams necessary for predicting the time and degree of curing of the Etal-Inject-SLM binder at different temperatures and curing times. This results can be useful for optimizing technological processes in which the low-viscosity epoxy binder Etal-Inject-SLM is used.

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