Electro-insulating varnish

FIELD: chemistry.

SUBSTANCE: varnish contains a varnish base, a functional additive which increases coating hardness, siccative HF and methyl ethyl ketoxime radical polymerisation inhibitor. The varnish base is an oligomer with strongly polar chromane rings. The oligomer is obtained by reacting tung oil and 101L phenol-formaldehyde resin, taken in equivalent ratio of 1:0.15-0.18, respectively, while heating said mixture for 60 minutes at temperature 160°C. After extracting water, temperature is raised to 182°C until achieving viscosity of 25-36 s. The oligomer is added to the composition in 50% xylene solution. The functional additive used is rosin ester with glycerine. Components are in the following ratio, wt %: oligomer - 31.0-36.2, rosin ester with glycerine - 9.0-3.8, siccative HF - 2.00, methyl ethyl ketoxime - 0.60, xylene - the balance.

EFFECT: wider raw material base, replacing molten amber, which is not produced on an industrial scale, with rosin ester with glycerine, high content of non-volatile substances, elasticity and electrical strength of the coating.

1 tbl, 2 ex

 

The invention relates to polymer chemistry, in particular insulating paints, varnishes and lacquers for coating printed circuit boards and electronic products.

On set of operational and technological characteristics to protect printed circuit boards and electronic assemblies used in harsh climatic conditions, the application of the lacquer coating is the best solution.

According to the Norms of machine building of the USSR MN 4200-62 recommended to use for electrical insulation paint coating on the basis of a highly polar polymers, such as epoxy, urethane, phenolic and silicone resins (Webtimer. Polymer coatings in nuclear engineering. - M.: Atomizdat, 1965, str-266).

Known electrical insulating varnishes based on polyester resins. Thus, the known electrical insulating varnish PE-939 (TU 16-504.026-74), composed of polyester resin, organic solvents, polybutylene.

Known electrical insulating varnishes based polyetherimide resins (patent RF №2073273, NV 3/42, publ. 10.02.97, BI No. 4)containing oligomerized-modified polyorganosiloxane (polymethyl-, polyethylene -, and polymethylphenylsiloxane fluid), an aromatic solvent and tetrabutoxide. As the aromatic solvent used tricresol and solvent. Wire, EMA is new this structure, meets the requirements of enamelled wires with temperature index 155.

The disadvantage of this lacquer composition is the use of expensive tricresol.

Famous lucky insulation class F (155°C) based on the hydroxyl-containing oligoesters, blocked polyisocyanates and organic solvents (Handbook of electrical materials. Edited Uwhich, WAV, Bmeia. Vol. 1. M.: Energoatomizdat, 1986. 367 S.; Toy, Two, Ivesiana. Insulating varnishes. M.: Chemistry. 1981. 216 C.).

The disadvantages of this varnish are the use of expensive, scarce and toxic blocked MDI, a relatively high viscosity at low content of non-volatiles, the limited viability of varnish and low binding ability of the cured composition.

Despite the wide range of synthetic resins used to obtain the electrical insulating varnishes, in their production using a combination of natural oils. Most quick-drying oil is Tung and linseed oil.

However, based on them is not always possible to obtain a sufficiently well-formed coating. In this case, the composition of the lacquer binder is injected compounds that increase the hardness and reduce the time of their chemical and the physical curing coatings.

Closest to the technical nature of the prototype of the present invention is an insulating varnish FL-582 produced Odessa paint factory on THE 6-10-1236-77.

Lacquer FL-582 contains in parts by weight the following components:

the Tung oil24,10
resin phenol-formaldehyde "L"7,02
paraffin0,72
amber fused8,98
desiccant LCD 12,33
xylene18,07
white spirit42,77

The presence in the formulation of the lacquer FL-582 fused amber gives the painted surface a higher hardness, improves gloss, weather resistance and penetration resistance.

The technical result of the present invention is the expansion of raw materials, replacement is not produced on an industrial scale melted amber, increasing the share of non-volatiles, elasticity and dielectric strength of the coating.

To achieve the technical result of the proposed electroizoliti the config lacquer for coating printed circuit boards and electronic products, containing lacquer-based, functional additive that increases the hardness of the coating, drying and NF inhibitor of radical polymerization, methylethylketoxime, the lacquer bases it contains oligomer with cinnaprarie ramanavami rings, obtained by the interaction between Tung oil and phenol-formaldehyde resin brand L taken in an equivalent ratio of 1:0,15-0,18 respectively, by heating this mixture for 60 minutes at 160°C until the termination of allocation of water, followed by raising the temperature to 182°C and achievement viscosity 25-36 sec entered into the composition of 50% xylene solution, and as a functional supplements - ester of rosin glycerol, in the following ratio, wt.%:

oligomer31,0 and 36.2
ester of rosin glycerol9,0 to 3.8
desiccant NP2,00
methylethylketoxime0,60
xylenerest

Distinctive features of the proposed electrical insulating varnish from the prototype - varnish FL-582 are:

- use as varnish is howling basis of the oligomer with cinnaprarie ramanavami rings;

- presence in the recipe instead of melted amber ester gabius (ester of rosin glycerol), which increases not only the physico-mechanical, including water resistance, and electrical insulating properties of the coating;

- replacement of paraffin in the mixture of desiccant with methylcytosine (MAKE);

- use as a solvent only xylene.

Insulating varnish was prepared as follows.

Example 1.

In the reaction flask, equipped with direct-fridge, download Tung oil and phenol-formaldehyde resin grade L in an equivalent ratio of 1:0.15 in. The mixture is heated for 60 minutes at 160°C and maintained until the termination of allocation of water. The resulting oligomer is heated for 60 minutes at 160°C and maintained until the termination of allocation of water. The resulting oligomer is heated to 182°C and maintained at this temperature for 3 hours before reaching the stopping viscosity (25-36 sec). After cooling the mixture to 120°C add xylene to obtain a 50% solution. In the resulting solution is injected ester of rosin and glycerol ester of gerpisa), then add desiccant from the group naphthenic according to GOST 1003-73, mainly brand NH, in the amount of 2 wt.% and methylketones (MAKO) in the amount of 0.60 wt.% of the total weight of the varnish base, the resulting mixture is stirred.

Example 2.

In the reaction flasks is, equipped with direct-fridge, download Tung oil and phenol-formaldehyde resin grade L in an equivalent ratio of 1:0,18. The mixture is heated for 60 minutes at a temperature of 160°C to stop shedding water. Then raise the temperature to 178°C and maintained at this temperature for 120 minutes to reach the bus-stop viscosity (25-36 seconds), then add xylene to obtain a 50% solution of the oligomer in xylene. In the resulting solution is injected ester of rosin glycerol ester of gerpisa), then add desiccant from the group naphthenic according to GOST 1003-73, mainly brand NP, at 2% and methylketones (MAKO) in the amount of 0.60% of the total weight of the lacquer base. The resulting mixture is stirred.

The resulting lacquer is applied on printed circuit boards or electronic products spray viscosity 12-13 sec in xylene according to the following scheme:

No. n Mode of application, number of layersThickness, mmDrying, hTemperature, °C
1The layer of lacquer20-250,820
2The W is a layer 20-258-1065
32 coats of varnish20-250,820
4The same layer20-258-1065

Comparative characteristics of the inventive insulating varnish and prototype are listed in table 1.

According to the data of table 1, when replacing the main components of the lacquer composition of the prototype the main indicators of functional properties of electrical insulating varnish of the present invention is elastic and dielectric strength higher than that of the prototype, which confirms the achievement of the claimed technical result.

Table 1
№ p/pIndicesThe prototype for THE 6-10-1230-77Insulating varnish according to this invention (Example 1)Insulating varnish according to this invention (Example 2)
1.Black is t and appearance Transparent homogeneous liquid brown
2.PurityAfter drying, the lacquer forms a smooth transparent film without rash
3.Viscosity by viscometer B3-246, at 20°C, seconds15-3525-3625-36
4.Mass fraction of non-volatiles, %39±448,048,0
5.The drying time up to 3, h is not more than 60°C±2°C4,03,54,0
at 120°C±2°C2,02,02,0
6.Elasticity, mm, not more than31 1
7.Resistance to static action of 5% NaCl solution 20°C, not less, h505050
8.Dielectric strength at 20°C, kV/mm, not less than6010080
9.The strength of the blow by "N1", kg/cmNo data5045

Insulating varnish for coating printed circuit boards and electronic products containing lacquer-based, functional additive that increases the hardness of the coating, drying and NF inhibitor of radical polymerization, methylethylketoxime, the lacquer bases it contains oligomer with cinnaprarie ramanavami rings, obtained by the interaction between Tung oil and phenol-formaldehyde resin brand L taken in an equivalent ratio of 1:0,15-0,18 respectively, by heating this mixture for 60 min at 160°C until the termination of allocation of water, followed by raising the temperature to 182°C and reaching a viscosity 25-36, included in the in 50%xylene Rast is ora, and as functional additives - ester of rosin glycerol, in the following ratio, wt.%:

oligomer31,0 and 36.2
ester of rosin glycerol9,0 to 3.8
desiccant NP2,00
methylethylketoxime0,60
xylenerest



 

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