Effect of mineral fillers on the properties of silicone coatings

Гулай, Ольга Іванівна; Tselyukh, O. I.; Nironovych, I. O.; Serednyts'kyi, Ya. A.

doi:10.1007/bf02539071

Cited by 5 publications

(2 citation statements)

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“…The works [12,13] are the most informative, as they are as close as possible to the topic of interest and reveal the possibility of using fillers for a comprehensive solution to the problem.…”

Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

Study of the fillers influence on the organosilicon polymers resistance to high temperatures

Pakhomova

Povalchuk

2022

TAPR

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Organosilicon varnishes, such as polymethylphenylsiloxane and polyaluminomethylphenylsiloxane, filled with modified clay minerals are the object of research The most vulnerable place of the organosilicon coating is insufficient mechanical properties (hardness, impact strength, etc.) and low adhesive strength of the film to the surface, especially when operating at elevated temperatures. Various oxides, ceramic compounds, natural and synthetic silicate materials are introduced into organosilicon compositions to improve the specified properties. But only individual units can comprehensively improve both the mechanical and heat-resistant properties of organosilicon compounds although the range of such materials is quite wide. The clay minerals palygorskite, which is classified as an intermediate type between strip and layered silicates, and montmorillonite from the subclass of layered silicates, which have a natural high dispersion, were used as fillers during the study. The choice of palygorskite and montmorillonite is explained by the sufficient study of their behavior in organic environments by a number of scientists, availability and economic advantages for introduction into production. Existing clay minerals, which are traditionally used to solve the problem of improving the physical and mechanical properties of organosilicon coatings, are not sufficiently active due to the hydrophilic properties of the particles surface. Based on this, a modifier that has proven itself well in this field was used for the study. A number of compositions of heat-resistant organosilicon varnishes with modified fillers based on the above-mentioned clay minerals were obtained. It was established that the introduction of modified forms of natural aluminosilicates contributes to the increase of temperature resistance in filled coatings, compared to coatings made of pure polymer. At the same time, the best effect is achieved when using montmorillonite. This is related with the fact that the proposed compositions of polymethylphenylsiloxane varnish and montmorillonite have a number of features, in particular, the highest comprehensive result of simultaneous improvement of the physical, mechanical and thermal properties of the specified coatings. It is possible to obtain compositions with stable physico-mechanical properties, as they withstood heat treatment at 400 °C for 100 hours without visible changes in integrity, due to the introduction of the optimal amount of modified montmorillonite into organosilicon varnishes KO-08K and KO-921. Compared to similar heat-resistant polymethylphenylsiloxane varnishes, longer service life at elevated temperatures is ensured.

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Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

Study of the fillers influence on the organosilicon polymers resistance to high temperatures

Pakhomova

Povalchuk

2022

TAPR

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“…They combine well the thermal stability of the silicon-oxygen skeleton and satisfactory physicomechanical properties of organic polymers [1][2][3]. The indicated characteristics as well as insulating and corrosion-resisting parameters of the coatings increase substantially after modification of the organosilicon matrix based on lacquer KO-921 (GOST 16508-70) with mineral fillers of the oxide and oxide-silicate types [4,5] and with polymers, specifically epoxy and furan resins [3,6].Generally, organosilicon composites cure at temperatures of 180-220~ which makes it possible to obtain high-quality heat-resistant insulating coatings. However, this complicates considerably the technological process of protection of metal products and metal structures.…”

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Effect of silazane catalysts on properties of organosilicone lacquer coatings

Гулай¹,

Serednyts'kyi²

1999

Mater Sci

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We study the influence of silazane catalysts on the structurizing and formation of organosilicon coatings based on lacquer KO-921. These catalysts guarantee the curing of coatings at temperatures of (20 + 2)~ The catalytic mechanism of the action of silazanes is confirmed by the IR spectra of cured composites. The improvement in their chemical and thermal stability is substantiated by the physicochemical parameters determined experimentally.In the practice of corrosion protection of pipelines, metal structures, and technological equipment, organosilicon coatings based on polymethylphenylsiloxane lacquers and enamels are extensively used. They combine well the thermal stability of the silicon-oxygen skeleton and satisfactory physicomechanical properties of organic polymers [1][2][3]. The indicated characteristics as well as insulating and corrosion-resisting parameters of the coatings increase substantially after modification of the organosilicon matrix based on lacquer KO-921 (GOST 16508-70) with mineral fillers of the oxide and oxide-silicate types [4,5] and with polymers, specifically epoxy and furan resins [3,6].Generally, organosilicon composites cure at temperatures of 180-220~ which makes it possible to obtain high-quality heat-resistant insulating coatings. However, this complicates considerably the technological process of protection of metal products and metal structures. This is why, to lower the structurization temperature of organosilicone composites down to 20-30~ curing catalysts and reactive cross-linking agents are added to them [1][2][3][4][5][6][7]. Previous investigations of the effect of curing agents on the formation of coatings based on polymethyl-phenylsiloxane lacquer showed that the addition of silazane catalysts into compositions is promising, since, on air drying, polysilazanes can form hard protective films.In the present work, studying the properties of composite materials based on organosilicon (lacquer KO-921), we used saturated, unsaturated, and organoboron silazanes, namely, polymethylsilazane MSN-7 (TU 6-02-991-75), polymethylvinylsilazane KT-30 (TU 6-02-486-74), and methylphenylborosilazane MFSN-B (TU 6-02-862-74), as curing agents. The content of fillers in the original compositions was 2 mass %. Samples 200-300 jam thick were obtained by a familiar procedure at a temperature of (20 + 2)~ [8]. The lifetime of the composites did not exceed 2h.The degree of cross-linking of polymeric films was determined by the content of a gel fraction by extracting low-molecular constituents with toluene in a Soxhlet apparatus. The relative hardness was measured with a pendulum apparatus M-3. The chemical resistance in 5% aqueous solutions of HC1 and NaOH was evaluated by the mass method. Thermal-oxidative destruction was studied by the methods of complex differential thermal analysis and thermogravimetry on a derivatograph of the "Paulik, Paulik, Erdey" firm in air (heating rate was 10~ min-1, sensitivity of measurements was 500 units, and temperature range was 20-800~The energy of activatio...

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