A method of manufacturing an electrically insulating material and electrically insulating composition

 

(57) Abstract:

Usage: the invention relates to electrical engineering, in particular to methods for insulating materials based on dielectric compositions, and these compositions. The objective of the invention is to provide an electrically insulating material, produced according to the composition, allowing to control its stiffness. The inventive method of manufacturing material is impregnated substrate composition designed for use in this way, and its subsequent drying in a period of 2-30 minutes at a temperature of 60-140oC. Composition used in the manufacture of the material contains a thermosetting resin, the complex BF3Amin, thinner and polyaluminosilicate with a ratio Si/Al is equal to 3-6, and time of gelatinization at 200oC no more than 5 min with NaOH content not more than 0.1%, the components are taken in the ratio, by weight.h.: thermosetting resin 100, the complex BF3Amin 0.1 to 5.0, polyaluminosilicate 0.1 to 20.0 diluent 0.1 to 100. The ability to control the stiffness of the insulating material expands when added to a composition of a thermoplastic resin with a molecular weight of 15-25 is Ieper, the polysulfone, polyarylether, polycarbonate, etc., 2 sec. and 8 C.p. f-crystals, 1 Il., table 2.

The invention relates to electrical engineering, in particular to methods for insulating materials based on dielectric compositions, and these compositions.

In the manufacture of electrical insulating materials based on components such as fabric, paper, film, as fastening their binders are used in the main composition based on a polymeric resin.

Properties of electrical insulating material, in particular of the type prepreg (impregnating tape, packing materials, laminated plastics, etc), are determined by the properties of the binder. In the prepregs used for electrical purposes has spread binder composition based on thermosetting resins due to their low shrinkage during curing, good dielectric properties and heat resistance. Widespread binder based on epoxy resins.

A necessary component of thermosetting binder is a curing agent, providing a transition resin into an insoluble and infusible state, what is the ultimate technological operation when lane is rditella, which are inert at room temperature, but at higher temperatures they activate functional groups and cause the formation of polymer, i.e., curing. An example of such a curing agent is a complex of boron TRIFLUORIDE and Amin [1] the Use of latent hardeners helps to ensure a relatively long retention time of material in a few months and years, preserving the required technological properties. In some cases, however, the use of such hardeners causes some inconvenience. In particular, the epoxy resin composition of the complex BF3Amin does not always meet the requirements of the prepreg requirements in terms of stiffness. This indicator can be excessive at room temperature, which makes the necessary heating of the prepreg during processing to soften; for example, the rigidity of the prepreg with epoxydodecane resin is 18 H/m Hardness may be insufficient, which does not allow to apply the prepreg without wrinkles and folds, for example, when the content in the binder complex BF3Amin less than 1% in Addition, the latency of the known hardeners is not always sufficient, since at low heat (up to 60-70oC) in the material of the beginning of the ILO is heated. The introduction of plasticizers or fillers partially to compensate for these shortcomings, however, the prepreg can acquire undesirable stickiness or increased porosity.

The objective of this invention is to provide a dielectric composition, the use of which would allow to control the rigidity of the insulating material in the desired direction during the manufacture of the material by adjusting the relative amount of hardener in the ratio of components in the composition. This problem is solved in insulating compositions based on thermosetting resins, complex BF3Amin and thinner due to the fact that the composition additionally contains polyaluminosilicate with a ratio Si/Al is equal to 3-6, and time of gelatinization at 200oC no more than 5 min, NaOH content not more than 0.1% of the components are taken in the ratio, by weight.h. thermosetting resin 100, the complex BF3Amin 0.1 to 5.0, polyaluminosilicate 0,1-20,0, the diluent of 0.1 to 100.0.

The ability to control the stiffness of the insulating material expands when added to a composition of a thermoplastic resin with a molecular weight of 15-25 thousand of their resins using polyaluminosilicate in itself known, however, the thus obtained compositions are characterized by substantial rigidity and fragility, which does not allow them to be used in the prepregs.

Research conducted by the authors showed that when used in the composition of the hardener BF3Amin in combination with polyaluminosilicate the rigidity of the prepregs can be changed in the desired direction by changing the amount of polyaluminosilicate in relation to the complex BF3-Amin. The content of the hardener BF3Amin-polyaluminosilicate in the binder should be at least 0.2 wt.h. on 100 wt.h. thermosetting resin. This allows you to obtain the dielectric properties of the cured prepreg, is not inferior to the famous. The specified properties of the hardener that allows to adjust the stiffness of the prepreg, preserved and adding in a binder of thermoplastic resins with a molecular weight of 15-25 thousand for example, polysulfate, fatty acids and specific additives. It should be noted that simultaneously with the effect of control stiffness of the prepregs, the proposed composition advantageously has a higher latency curing. The properties of the composition, allowing a change in the desired direction Indostan, appear in insulating materials with a variety of reinforcing components and substrates in organic and inorganic fabrics, papers and films (for example, glass, polyester, mica, and so on and so forth). It should be noted that a necessary condition for a solution in the invention of this problem is the use of polyaluminosilicate with a ratio Si/Al equal to 3-6 and time of gelatinization at 200oC no more than 5 min, NaOH content not more than 0.1% It is based on the results of the authors of the studies. At a higher Al content and time of gelatinization at 200oC over 5 min, the increase of rigidity of the prepreg on the basis of the proposed composition. The NaOH content more than 0.1% leads to deterioration of dielectric characteristics of the prepreg.

The methods for the production of prepregs [2] as a rule, consist of two technological operations. The first operation consists in that on the substrate (glass, paper, etc) put a binder containing the hardener. The second operation consists in drying the impregnated prepreg certain time at a given temperature. The choice of temperature and time of drying prioe for processing condition, i.e., the absence of a tack-free surface. In accordance with the foregoing method of manufacture of the prepreg on the basis of the proposed dielectric composition consists in the impregnation of the substrate one of the known techniques and its subsequent drying in a period of 2-30 minutes at temperatures of 60 1400oC. In this case, smaller values of temperature and drying time are compositions with a highly volatile solvent and less content and more content hardeners, and large values of temperature and drying time are, respectively, for compositions with more severe thinner, more content and a lower content of hardeners. Failure to comply with specified regulation of the drying mode can control the hardness of the manufactured material is significantly reduced. In practice, the duration of the drying material and the temperature level is determined by the length of the clothes drying machine and drying rates. In each case choose the time required in the drying temperature, and these values are within the stated limits.

The invention is illustrated by examples of the proposed use of the binder in the manufacture SS="ptx2">

Epoxiconazol resin pack-643 100

The complex BF3Amin with monoethylamine 2

The methyl ethyl ketone (MEK) 40

In a preheated 70-80oC resin pack-643 add methyl ethyl ketone. Components are mixed to obtain a homogeneous resin solution. Then at last introduces the solution of a complex of boron TRIFLUORIDE with monoethylamine in IEC and stirred the solution for two hours. The obtained varnish was filtered through silk "Excelsior". The varnish used in the manufacture of the prepreg, in this case steklomagnezitovy tape.

The tape was produced by impregnating machine horizontal type according to the following technology (see diagram depicted in Fig.). Fiberglass 1 was impregnated in a bath 2 containing the binder solution. The impregnated glass cloth was combined with slyudinitovyh paper 3, and a cloth tape was admitted into the drying zone 5, where it was subjected to drying at a temperature of 100oC for 15 minutes At the exit from the last drying zone at sljudinitovye paper superimposed polymeric film 5 deposited on the inner surface of the binder layer 6. Before combination cloth tape and the varnished surface of the film was the last to dry a little by blowing warm air at a temperature of 70-80oC 4.ATEM roll cut into clips of given width. The obtained tape was subjected to electro-physical tests. The ratio of binder components for tapes and drying are given in table. 1, and the properties of the tapes and binders in the table. 2. Similarly, the produced prepreg and in subsequent examples N 2,3,5,6,8.

Example 2.

The technology of manufacturing a binder similar to example No. 1. The composition of the binder shown in table 1. Properties of the prepreg and varnish are shown in table 2.

Example 3.

The technology of manufacturing a binder similar to example 1. The composition of the binder shown in table 1. Properties of the prepreg and varnish are shown in table 2.

Example 4.

The technology of manufacturing a binder similar to example 1. The composition of the binder shown in table 1. The tape was produced by impregnating machine horizontal type according to the following technology (see the above diagram). Fiberglass 1 was impregnated in a bath containing a solution of binder 2. Impregnated fiberglass combined with slyudinitovyh paper 3 and the cloth tape received in the drying zone 4, where it was subjected to drying at a temperature of 60oC for 30 minutes At the output of the penultimate zone drying the tape was Lateralus from slyudinitovyh paper solution the connection is ramny mechanism 7 machine and was tied into a roll 8. After which the roll was installed in the distributing unit rewinder machine, where he peremalivala in roll diameter 10010 mm. Then roll cut into the rollers of the specified width.

Similarly produced tapes in examples 9, 10.

Example 5.

The technology of manufacturing a binder similar to example No. 1. The composition of the binder shown in table 1. Properties of the prepreg and varnish are shown in table 2.

Example 6.

The technology of manufacturing a binder similar to example 1. The composition of the binder shown in table 1. Properties of the prepreg and varnish are shown in table 2.

Example 7.

The technology of manufacturing a binder similar to example 1. The composition of the binder shown in table 1. Properties of the prepreg and varnish are shown in table 2.

Example 8K.

The technology of manufacturing a binder similar to example 1. The composition of the binder shown in table 1. Properties of the prepreg and varnish are shown in table 2.

Example 9K.

The technology of manufacturing a binder similar to example 1. The composition of the binder shown in table 1. Properties of the prepreg and varnish are shown in table 2.

As can be seen from table 1, in the absence of polyaluminosilicate complicates the overlay prepreg when it is used for the manufacture of electrical equipment.

The introduction of polyaluminosilicate in an amount of 0.1 wt.h. reduce the hardness to 10 H/m and this increases the gelling time up to 5 min, at 150oC. With the introduction of 6 wt.h. polyaluminosilicate and 0.1 wt. including complex BF3-amine (example # 7) the stiffness of the prepreg is equivalent to 5 H/m, and the gelling time 11 minutes As can be seen from examples 2 to 6, change the content of the complex BF3Amin-polyaluminosilicate allows you to adjust the stiffness in the range of 6 to 10 H/m and gelling time 5 to 10 min at 150oC. Thus, as can be seen from table 2, the introduction of polyaluminosilicate known in the composition BF3Amin allows to solve in the invention the task of getting the ability to change the stiffness of the prepregs by regulating the relative amount of curing agent in a binder.

1. A method of manufacturing an electrically insulating material, in which a woven or paper base impregnated with insulating composition comprising a thermosetting resin, the complex BF3-Amin, and dried at elevated temperature, characterized in that use electrical insulating composition, optionally containing polyaluminosilicate with a ratio Si/Al, R isC for 2 to 30 minutes, while the insulating components of the composition taken in the following ratio, wt.

Thermosetting resin 100

The complex BF3Amin 0.1 to 5

Polyaluminosilicate 0,1 20

The diluent 0,1 100

2. The method according to p. 1, characterized in that use electrical insulating composition, optionally containing a thermoplastic resin (mol. m 15000 - 25000 with the following content, wt.

Thermosetting resin 100

Thermoplastic resin is 0.1 100

The complex BF3Amin 0.1 to 5

Polyaluminosilicate 0,1 20

The diluent 0,1 100

3. The method according to p. 1 or 2, characterized in that the basis of the supply substrate polymer film.

4. Insulating composition containing a thermosetting resin, the complex BF3-amine and diluent, characterized in that it further comprises polyaluminosilicate with a ratio Si/Al is 3 to 6, the time of gelatinization at 200oWith no more than 5 min with NaOH content not more than 0.1% in the following ratio, wt.

Thermosetting resin 100

The complex BF3Amin 0.1 to 5

Polyaluminosilicate 0,1 20

The diluent 0,1 100

5. The composition according to p. 4, characterized by, the AU.

Thermosetting resin 100

Thermoplastic resin 0,2 100

The complex BF3Amin 0.1 to 5

Polyaluminosilicate 0,1 20

The diluent 0,1 100

6. The composition according to p. 5, characterized in that thermoplastic resin contains a polyester on the basis of the dimethyl ester of terephthalic acid, ethylene glycol and diethylene glycol with a melting point 80 100oC.

7. The composition according to p. 5, characterized in that thermoplastic resin it contains polysulfone.

8. The composition according to p. 5, characterized in that thermoplastic resin it contains polyarylether.

9. The composition according to p. 5, characterized in that thermoplastic resin it contains polycarbonate.

10. The composition according to p. 5, characterized in that thermoplastic resin used is a mixture of resins.

 

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