SU441804A1 - Compound - Google Patents

Description

The invention concerns the creation of a potting and impregnating compound.

Known impregnating composition based on forsopolymer butyl methacrylate is a polymerization product of butyl methacrylate in the presence of alkylene-aromatic hydroperoxides, popimerization of oligoether acrylates and radical initiator in the following ratio, components, parts by weight:

Forsopolimer butyl

methacrylate70-95

Polymerizable oligoetheracrylate 5-30

Free radical

initiator1-3

However, such a composition cannot be used as a casting in those cases when insulating coatings with a thickness of more than 1 mm are required, since cracks occur in thick layers of the compound during its rapid curing.,

The purpose of the invention is to increase the mechanical characteristics of the compound and reduce its mass loss during thermal aging.

This is achieved by the fact that the components that make up the compound, in the following ratio, take weight parts:

Forsopolimer butylmeta-

krlata.95,5-99,8

P rome

Ny oligoetriacrylate 0.2-2.5

Free Radics, 11n

initiator 0,2-2

Forsopolymer is prepared by polymerization of butyl methacrylate in the presence of 2–25% by weight of polyphenylenemethylene hydroperoxide at 9512 ° C to the viscosity of the resulting forsopolymer 6О-25ОО cf at 25 ° С. As oligoether acrylate, you can use the oligoether acrylate MGF-1 fa;, OJ-methacrylate- (bis-ethylene glycol) -phthalate, oligoester acrylate MDF-1 ot, (jj-methacrylate- (bio-diethylene glycol) -fesh1atJ, etc.

The oligoester acrylate can be introduced both at the stage of the preparation of the butyl methacrylate forsopolimer and the polyphenylenemethylene peroxide (GG1-1) and after its manufacture. The resulting compounds, depending on the polymerization depth of the Forsopolymer, have a viscosity of 60–25OO CPS at 25 ° C. They are stored for a long time in the presence of hardener (benzoyl peroxide), remaining suitable for use. Thus, the compound in summer conditions at room temperature (25-30 0) for 30 days remained suitable for use. The compounds cure at 80-140 ° C for several hours. Samples of hardened compounds are elastic materials that withstand 180 kinks of bends. without mechanical damage. The specific volume resistance of the proposed compound at elevated temperatures is an order of magnitude higher than that of the known impregnating composition. The tensile strength and resistance to thermal aging of the samples of the proposed compound with a thickness of 1 mm are also higher compared to the known impregnating material (see table). Example 1. 5 weight.h. HP-1 hydroperoxide (content of active oxygen 0.36%, mol. BOO weight) is dissolved in 95 parts by weight. butylmegacrylate and placed in a flask equipped with a stirrer, thermometer and reflux condenser. The flask with the reaction mass is thermostatically controlled at 110 ° C and the polymerization is carried out for 30 min., The viscosity of the reaction mass reaches 180 s. The resulting forsopolymer is mixed at 2 ° C with 0.2 weight parts. oligoetheacrylate MGFi 0.5 weight.h. benzoyl peroxide. Verification mode: 3 hours at and 6 hours at 120 C. The properties of the compound are listed in the table. PRI li me R 1., G) B s.ch. .C | .1111 (. | .- |; lsi GP-1 11 asgvorpyut in 9-1.8 hours. But. The reaction mass flasks were thermostatically controlled at 110 ° C and reacted for 30 minutes, 0.5 parts by weight of benzoyl peroxide was added to the resulting forsopolymer at 20 ° C. The viscosity of the resulting compound was 195 spz. C and 6 hours at 120 ° C. Weight loss of solidified samples with a thickened 1 mm at 50 days of 5.6%. Tensile strength after aging at 160 ° C for 12 days, 16O kg / cm. The electrical properties are at the level of the properties of the compound, the preparation of which is described in Example 1. Example 3. 5 parts by weight of the hydroperoxide GP-1 are dissolved in 95 parts by weight of butyl methacrylate. 1, The resulting forsopolymer is mixed with 0.5 parts by weight of MDF-1 oligoester acrylate and 0.5 parts by weight of benzoyl peroxide. Curing mode: 3 hours at 6 hours at 120 C. The properties of the compound are at the level of the compound properties, described in, example 1. Example 4. 10 weight.h. HP-1 hydroperoxides are dissolved in 90 parts by weight. butyl methacrylate. Forsopolymerization is carried out according to Example 1. At the same time, the viscosity of the reaction mass reaches 800 spz. The resulting forsopolymer is mixed with 4 weight.h. oligoether acrylate MGF-1 and 0.5 weight.h. benzoyl peroxide. Curing mode: 3 hours at 1 ° C and 6 hours at 12 ° C. The mass loss of solidified samples is colder 4 mm at 180 ° C in 16 days 3%. The specific volume resistance of the samples at 2O and 155 ° С is 1.4-10 and 7.4 X 1O, respectively, cm.

Properties

Known impregnation compound

Tensile strength (e

razr

. 2 kg / cm

Weight loss in the process of geshyuvy aging when exposed to air,%, per day:

2

four

eight

sixteen

50

Specific volume resistance UE, ohm, cm, at a temperature, 0 С:

2O 130 150

Claims (1)

Invention Formula A compound containing butyl methacrylate forsopolymer and polyphenylenemethylene hydroperoxide, a polymerization oligoether acrylate and freedoms is a radical initiator, characterized in that, in order to improve the mechanical characteristics of the compound and reduce 60 80 2.5 2.5 3 4 6 3.5 four 9 five four 14 15 9, O-10 3.1-10 12 eleven 1.7-1О 2,4-1О eleven ten 7.4-10 5.2-10 neither its mass loss during thermal aging, the indicated components are taken in the following ratio, parts by weight: Forsopolimer butyl methacrylate .95,5-99,8 Polymerization oligoether acrylate0,2- 4,5 Free radical initiator 0,2-2.