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RU-2861730-C1 - EPOXYSILOXANE COMPOSITION FOR PROTECTIVE COATINGS

RU2861730C1RU 2861730 C1RU2861730 C1RU 2861730C1RU-2861730-C1

Abstract

FIELD: epoxy resin. SUBSTANCE: present invention relates to compositions based on epoxy resin applicable for protective coatings, and more specifically, to epoxysiloxane compositions having improved adhesion, thermal and electrical insulating properties. An epoxysiloxane composition for protective coatings is proposed, comprising an epoxy resin and an amino-containing organosilicon hardener of the formula , where R= –CH 3 , –C 2 H 5 ; n=1,2; m=2,3. The content of the components in the composition is, in parts by weight: bisphenol A epoxy resin 100, amino-containing organosilicon hardener 12-70. EFFECT: improvement of adhesion, electrical insulating properties, reduction of the glass transition temperature, possibility of increasing coating deformation in the temperature range from -45 to 80°C. 1 cl, 2 tbl, 27 ex

Inventors

  • Kuzmin Mikhail Vladimirovich
  • Koliamshin Oleg Aktarevich
  • Ivanova Kristina Iurevna
  • Vasilev Andrei Borisovich
  • LUKIN ALEKSEI VASILEVICH
  • Iakovleva Anna Vasilevna

Dates

Publication Date
20260508
Application Date
20250829

Claims (4)

  1. An epoxysiloxane composition for protective coatings, comprising an epoxy resin and an amine-containing organosilicon hardener of the formula:
  2. ,
  3. where R= –CH 3 , –C 2 H 5 ; n=1.2 m=2.3, with the following content of components, mass parts:
  4. epoxy resin 100 amine-containing organosilicon hardener 12-70

Description

The present invention relates to epoxy resin-based compositions suitable for protective coatings, and more particularly to epoxysiloxane compositions having improved adhesive, thermal and electrical insulating properties. Epoxy protective coatings are widely used in the electrical and electronics industries, as well as in aircraft, shipbuilding, and mechanical engineering. The addition of various functional groups to epoxy coatings enhances the performance characteristics required for specific applications. Binders based on epoxy resins and various hardeners (chain extenders) are widely used as the polymer matrix. The advantages of epoxy coatings include high adhesion, low shrinkage, and the ability to cure over a wide temperature range. When cured, they exhibit excellent mechanical properties and chemical resistance. However, epoxy varnish coatings have several disadvantages: high brittleness and low heat resistance, which results in reduced strength and rigidity at elevated temperatures. Epoxysiloxane compositions for protective coatings are known according to patents RU 2503696, RU 2614681, RU 2619319, RU 2309171, containing epoxy resin and an amine-containing organosilicon hardener. The disadvantages of these compositions are the high glass transition temperature and, as a consequence, low deformation characteristics in the temperature range from -45°C to 80°C. The technical result is the production of a composition for use as a protective coating, which has improved adhesive and electrical insulating properties, and a reduced glass transition temperature, which makes it possible to increase the deformation of the coating in the temperature range from -45 to 80°C. The technical result is achieved in that the epoxysiloxane compositions for protective coatings include an epoxy resin and an amine-containing organosilicon hardener of the formula , where R= –CH 3 , –C 2 H 5 ; n=1.2 m=2.3, with the following content of components, mass parts: epoxy-diane resin100amine-containing organosiliconhardener12-70 The following brands of epoxy-diane resins can be used as epoxy resins: ED-22, ED-20, ED-16, E-40, E-41, etc. To obtain amino-containing organosilicon hardeners – aminosiloxanes, the following starting components are used: 3-aminopropyltrimethoxysilane (Dynasylan®AMMO, Evonik), 3-aminopropyltriethoxysilane (TU 6-02-724-77, Altaikhimprom JSC), 2-aminoethanol (monoethanolamine) (TU 2423-159-00203335-2004, Kazanorgsintez PJSC), 3-amino-1-propanol (Sigma-Aldrich), diphenylsilanediol (GRANKHIM LLC). Amine-containing organosilicon hardeners are obtained by a two-stage method. In the first stage, the reaction of 3-(trimethoxysilyl)-1-propanamine ( 1a ) and 3-(triethoxysilyl)-1-propanamine ( 1b ) was studied based on the classical reaction [12] of interaction with diphenylsilanediol to clarify the structure of the resulting compounds. The process was carried out in a molar ratio of 2:1 with a gradual increase in temperature from 80 to obtain 3a (100°C to obtain 3b ) to 150°C with simultaneous distillation of the released methyl or ethyl alcohols. According to the IR and 1H NMR spectra, the reaction products are 3,3'-(3,3-diphenyl-1,1,5,5-tetramethoxytrisiloxane-1,5-diyl)bis-(propan-1-amine) ( 3a ) and 3,3'-(3,3-diphenyl-1,1,5,5-tetraethoxytrisiloxane-1,5-diyl)bis-(propan-1-amine) ( 3b ), which are formed in 99.5% yield as light yellow oily liquids (Scheme 1). The purity of the resulting diaminotrisiloxanes 3a and 3b was controlled by TLC, the composition was determined on the basis of elemental analysis data, and the structure was confirmed by IR and 1H NMR spectroscopy. In the IR spectra, the amino group is characterized by absorption bands with maxima at 3368, 3292, and 1591 cm -1 , corresponding to the stretching and deformation vibrations of the N–H bonds, and the siloxane bond is characterized by an intense absorption band of the stretching vibrations of the Si–O–Si bond in the region of 1068 and 1050 cm -1 . The 1 H NMR spectrum contains signals of the protons of the aminopropyl group at the silicon atom (multiplets with δ 0.54, 1.39, and 2.48 ppm), as well as methoxy groups (singlet at 3.17 ppm) and ethoxy groups (triplet at 1.06 ppm and quadruplet at 3.44 ppm, 3 J HH 7.0 Hz). Tetra- and hexaaminotrisiloxanes are obtained by transesterification of diaminotrisiloxanes 3a and 3b with 2-aminoethanol and 3-amino-1-propanol at temperatures of 170–190°C and molar ratios of 1:2 and 1:4. The process is monitored by measuring the amount of methanol or ethanol released. These reactions yielded tetra- and hexaaminotrisiloxanes ( 4a–c ) and ( 5a,b) , respectively, in high yields. Aminotrisiloxanes ( 4a-c ) and ( 5a,b ) are oily transparent liquids. In the IR spectra, as the number of amino groups in the aminotrisiloxanes increases, the intensity of the absorption bands of the stretching vibrations of N–H bonds in the region of 3367-3369 and 3285-3298 cm -1 increases. On the contrary, the intensity of the absorption bands