RU2685330C1 - Polyurethane compound of cold hardening - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering, is used for sealing electrical products and radioelectronic equipment and serves for their protection against negative effect of air atmosphere and/or negative effect of various factors when using electrical equipment under ground. Polyurethane compound of cold curing is a two-component system consisting of Component "A" – polyol component and Component "B" – isocyanate component, wherein Component "A" consists of fatty carboxylic acids triglyceride (FCAT) with ricinolium content of not less than 80–90 %, polyether with molar weight of 300–500, filler, fire retardants, dehydrator, deaerator, and Component "B" is polymerized methylene diphenyl diisocyanate (PIC).

EFFECT: creation of polyurethane atmosphere-resistant compound of cold hardening with increased manufacturability.

6 cl

Description

The invention relates to the field of electrical engineering, is used to seal electrical products and electronic equipment and serves to protect them from the negative influence of the atmosphere of air and / or the negative influence of various factors when using electrical equipment underground.

The epoxy compound is known (certificate of authorship No. 783859, publication date 30.11.1980), which involves the direct curing of oligoether acrylate filled with quartz filler. Currently, such a compound is not of practical value.

A known epoxy compound (inventor's certificate No. 801108, publication date 01/30/1981), which involves curing epoxy resin Dianova, filled with quartz filler, anhydrite hardener type. As a plasticizer, an organochloride oligomer is used.

Despite the high temperature resistance, this invention has a number of serious drawbacks, such as the need to maintain high temperatures both at the time of synthesis of the compound, and at the time of its application (casting) 90-100 ° C, as well as high viscosity, a short lifetime of 60 minutes.

Known epoxyurethane compound (RF patent №2559442, publication date 08/10/2015 g), which involves the use of Component "A": bisphenol A and / or its esters, namely diglycidyl ether of bisphenol A (DGEBFA), monoglycidyl ether of bisphenol A (MBEL) , the product of the addition of one mole of bisphenol A to one pray of bisphenol A diglycidyl ether (PPMDGEBFA) together with triglycerides of fatty carboxylic acids, namely ricinoleic, stearic, oleic, linoleic, lenolenic (vegetable oils, mainly castor and under olnechnikovoe) and other auxiliary agents: technological additives (surfactant solution in gasoline) and a filler (ground quartz, ground tseloldit etc.). Curing is performed with a monomeric-oligomeric mixture of methylene di-para-phenylene diisocyanate - polyisocyanate (PIZ).

This is the closest chemical compound and compound with similar physiomechanical and operational properties. However, despite the high physicomechanical indicators (tensile strength, elongation, WADS and lifetime), this invention has several significant drawbacks: the need for a long (up to 2 h) high-temperature (up to 400 ° C) processing of components before preparing “Component A”, content as part of a compound of flammable organic substances (flammable substances).

A polyurethane insulating compound is known (RF patent №2537862, publication date 01/10/2015), which is obtained by sequential mixing of components: styrene (50%) and castor oil (38%), followed by their curing with benzoyl peroxide and product 102T (2, 4-toluene diisocyanate). However, this compound and its preparation process have several disadvantages: the need to preheat the cast products and vacuum the molds (at a residual pressure of 10-15 mm Hg), also the need to use highly toxic substances (styrene and TDI) and powerful oxidants (benzoyl peroxide) .

The technical result of the invention is the creation of a weather-resistant polyurethane compound of cold curing with improved processability compared with the known analogues due to:

- elimination of the need to heat the raw materials (both in the production of components, and directly when mixing the components of the compound and pouring into the mold), the mold and / or product being filled;

- preservation of the viability of the compound for 1-3 hours under the condition of a set of operational strength no later than 24 hours;

- reduction of viscosity to a level of not more than 1 Pa * s;

- reduce flammability.

The technical result is achieved by the selection of the unique chemical composition of monomeric raw materials. The inventive cold-cured polyurethane compound is a two-component system consisting of Component "A" - polyol component and Component "B" - isocyanate component, while Component "A" consists of, mass. h:

triglyceride of fatty carboxylic acids (TJKK) with a ricinolic acid content of at least 80-90% - 30.0-45.0;

polyether - 10.0-20.0;

filler - 0.1 to 40.0;

fire retardants - 10.0-35.0;

desiccant - 2.0-10.0;

the deaerator is 0.1-1.0,

Component B is a polymerized methylene diphenyl diisocyanate (PIC).

As a simple ether, an ether with a molar mass of 300-500 and a content of hydroxyl groups in the molecule of 2-3, for example, polyether based on polyoxyethylene glycol and / or polyoxypropylene glycol is used.

Quartz sand, microcalcite, chalk are used as filler.

As the flame retardants used TEF, THEP, TCPP, melamine, aluminum hydroxide 3, titanium dioxide.

Molecular sieves, synthetic aluminosilicate are used as a desiccant.

Defoamer, BYK 066, BYK 088 is used as a deaerator.

As a result, the obtained polyurethane electrical insulation compound does not require physical and / or chemical methods for the preparation of raw materials and can be obtained by direct mixing the components at room temperature (20 ± 5 ° C) and then curing at the specified temperature. The required purity of the polyurethane compound is achieved by the introduction of auxiliary agents. At the same time, the compound retains its viscosity (not more than 1 Pa * s) for 1-3 h and achieving operational strength within 24 h.

Also, the claimed compound has several advantages:

- has a wide range of operating temperatures from -60ºС to + 80ºС;

- not flammable;

- possesses weatherability and biostability and can be used for additional electrical insulation (high-voltage) cables laid underground and in air.

The method for producing an insulating polyurethane compound consists in the direct mixing of Components "A" and "B". After thorough mixing, the resulting compound is poured into a form (matrix). Curing of the compound occurs by the method of polycondensation between the hydroxyl groups of Component "A" and cyano groups of component "B", after their mixing. 24 hours after pouring, the product is removed from the mold and ready for operation.

Example 1

To obtain an insulating polyurethane compound, prepare Component "A" of the following composition:

No Name Content, mass. h one TZHKK (Castor oil) 39 2 Simple Polyester (Laprol 373) sixteen 3 Filler (Quartz sand FR 0.1-0.4 mm) 15 four Filler (Microcalcitfr up to 0.315 mm) ten five Fire retardant (Aluminum Hydroxide III) ten 6 Fire retardant (THEP) five 7 Desiccant (Siliporit) four eight Deaerator (Defoamer 5% in Laprol 373) one

After preparation of Component "A" it is mixed with Component "B" in proportions of 3: 1. After thorough mixing for 10 minutes, the resulting compound is poured into a mold. 24 hours after pouring, the product is ready for operation.

When mixing Components "A" and "B" at 20ºС, the viscosity of the compound is 0.6 Pa * s and remains at no more than 1 Pa * s for 50 min, while the lifetime of the compound is 1 hour.

The resulting compound has the following physico-mechanical characteristics:

No Name Test method Value one Density, kg / m ³ GOST 15139 1320 2 Shore hardness, detached GOST 263 48 3 Relative extension, % GOST 11262-80 6 four Volume resistivity at 20ºС, OM * m GOST 6433.2 4 * 10 ¹⁴ five Water absorption at 20ºС,% GOST 4650 method A 0.17

As a result, the claimed compound has an improved manufacturability, as well as provides effective protection of electrical equipment from moisture, dust, biodegradation and other negative environmental influences.

Claims (6)

1. Polyurethane compound of cold curing, characterized by the fact that it is a two-component system consisting of Component "A" - polyol component and Component "B" - isocyanate component, while Component "A" consists of, by weight, triglyceride fat carboxylic acids (TJKK) with a ricinolic acid content of at least 80-90% - 30.0-45.0; polyether with a molar mass of 300-500 - 10.0-20.0; filler 0.1-40.0; fire retardants 10.0-35.0; desiccant 2.0-10.0; deaerator 0.1–1.0, and Component “B” is a polymerized methylene diphenyl diisocyanate (PIC). 2. The polyurethane cold-cured compound according to claim 1, characterized in that a polyether based on polyoxyethylene glycol and / or polyoxypropylene glycol is used as an ether. 3. Polyurethane compound of cold hardening according to claim 1, characterized in that quartz sand, microcalcite, chalk is used as a filler. 4. Polyurethane compound of cold hardening according to claim 1, characterized in that TEF, THEF, TCPP, melamine, aluminum hydroxide III, titanium dioxide are used as flame retardants. 5. Polyurethane compound cold curing under item 1, characterized in that the desiccant is used synthetic aluminosilicate. 6. Polyurethane compound of cold hardening according to claim 1, characterized in that Defoamer, BYK 066, BYK 088 is used as a deaerator.