The sealing composition and method of sealing openings cable boxes

 

(57) Abstract:

The invention relates to polymeric materials for sealing mainly in electrical engineering and can be used in the construction of cable routes through the walls and sealed bulkhead compartments in shipbuilding and ship repair, sealing, and overstocking cable boxes if you want to keep the tightness of the compartments during operation in difficult conditions in the tropics and Antarctic, possible shock and vibration, and temperature extremes. Sealant is made on the basis of epoxy Dianova resin, hardener, and the target component, which is used as the resin pyrolysis of solid fuels with a density of not more than 1.06 g/cm3with nominal viscosity of not more than 1.3 and/or liquid oil sludge. Target component further comprises hexamethylenetetramine. A specific ratio of components in the composition improves the manufacturability and reliability of the sealing compound, and also simplifies the method of sealing while reducing costs by changing the rheological properties of the composition due to the use of recyclable products aloema. This sealant is initially injected into the lower part of the cavity opening until filling is complete. After the shrinkage process again injected sealant in the upper part of the cavity opening. 2 S. and 1 C.p. f-crystals, 3 ill., table 1.

The invention relates to polymeric materials for sealing cable openings boxes mainly in electrical engineering and can be used in the construction of cable routes through the walls and sealed bulkhead compartments in shipbuilding and ship repair, sealing, and overstocking cable boxes if you want to keep the tightness of the compartments during operation in difficult conditions in the tropics and Antarctic, possible shock and vibration, and temperature extremes.

Known sealing compounds based on epoxy resins containing optionally a curing agent in an effective amount and a filler, which in turn consists of the target organic additives or products of the pyrolysis of solid fuels [RF patent 2058363, 1996; publication Japan 10158365 And, 1998; publication Japan 09302201 A, 1997]. Known sealing compounds are relatively expensive, because they contain releasekey viscosity and a significant exothermic effect solidification, what causes shrinkage processes and reduces reliability.

As a prototype of the selected sealant epoxy-tar EIS-1 with an effective amount of a curing agent [RF patent 2054445, 1996]. The disadvantage of this structure is its relatively high cost, and the introduction of the Portland cement reduces the rheological properties of the sealant due to the increase of its viscosity and reduces the manufacturability and reliability of the method of sealing using it.

Known method of sealing openings is performed by pressing a thermoplastic sealing composition into the cavity opening, and then the introduction of the filling of the sealant through the filling hole into the cavity to fill the air pores [RF patent 1371357, 1996]. The disadvantage of this method is the complexity of its practical implementation in a large resealable opening, when the pressure is sufficient to press the sealant must be significant, and the need to have two different types of sealing compounds - plastic and casting.

An object of the invention is to improve the manufacturability manufacturing the temporal cost by modifying the rheological properties of the composition due to the use of recyclable products or waste.

The problem is solved as follows.

The inventive sealant is made on the basis of epoxy Dianova resin with the curing agent in an effective amount. What's new is that as the epoxy resin contains epoxy Dianova resin and optionally the target component, which is used as the resin pyrolysis of solid fuels with a density at 20oWith no more than 1.06 g/cm3with nominal viscosity at 50oWith not more than 1.3 sec and/or liquid petroleum sludge density at 20oWith not more than 0.88 g/cm3with nominal viscosity at 50oWith no more than 1.5 seconds and pour point not higher than -40oS, and the target component further comprises hexamethylenetetramine in an amount up to 1 wt.%, and the mass ratio of the epoxy resin and the target component is 15-20:80-85. You can use different brands of epoxy Dianova resins (e.g., ED-6, ED-20, and so on). The target component is cured by homopolymerisation, and for curing epoxy Dianova resin may be used any known curing agent, for example dictionarydefinition (yn-083314), isomethyltetrahydrophthalic anhydride (IMTFE), metaphenylenediamine, the economic result can also be achieved at a mass ratio of oil sludge and resin pyrolysis 1-3:7-9.

Method of sealing cable openings boxes provides for the introduction of the inventive sealing composition into the cavity opening. This sealant is initially injected into the lower part of the cavity opening until filling is complete. After the shrinkage process again injected sealant in the upper part of the cavity opening.

Before using sealant is best to cook in one stage, mixing the above components at a temperature not exceeding 25oC. the Composition is better to use at the same temperature for a period of not more than two hours after adding the hardener.

Close values of physical and chemical characteristics of the components, the absence of filler and plasticizer in the sealing composition to improve its rheological properties by reducing the viscosity and increasing the yield strength and, consequently, increase its technological and operational properties. Also, the use of recyclable products in the composition reduces the cost of finished marketable products.

The invention is illustrated in the drawing, in which Fig.1 shows a longitudinal section of a cable box installed in a sealed partition, and Fig. 2 - arousih compounds (V - the relative volumetric shrinkage, %, t - time, days).

The invention is illustrated on three examples, the sealant compositions (sealants) and example sealing of the opening cable boxes.

The compositions contain components, wt.h., presented in the table.

To prepare the target component of the compositions used for examples I and II - resin pyrolysis of coal with a density of 1.05 g/cm3(at 20oC) and conditional viscosity of 1.2 sec (50o(C) for examples II and III - liquid oil sludge density 0,875 g/cm3(at 20oC) and conditional viscosity of 1.4 sec (50oC) pour point not higher than -40oC.

The target component is produced in one stage by mixing the components at a temperature not exceeding 25oWith the mixer, equipped with a thermometer, which preloads the pyrolysis resin and/or oil sludge. Then at atmospheric pressure and a temperature of 20oWith injected under stirring 0.01 kg of hexamethylenetetramine. Immediately before use in the mixture is added with stirring epoxy Dianova resin and a polyethylenepolyamine. Received sealant use for a period of not more than two hours. Time loss of jiznesposobna the th composition becomes unsuitable for further use.

The compositions according to examples II and III are mainly intended for germetizirovany openings, working in conditions of low temperatures (due to the content of oil sludge). Antifreeze properties of the sealant according to example III above at somewhat reduced compared to examples I and II level of adhesion of the composition (but not lower than in the known epoxy compounds).

Apply sealant as follows (see Fig.1 and 2).

Work is carried out at a temperature sealant does not exceed 25oC. In the cavity of the cable boxes in the wall 1, the closed lids 2 and 3, through which the cables 4, through the lower hole 5 is injected sealant using a syringe. The control fill the cavity are carried out by the emergence of excess sealant from the holes 6, and then stop the flow of composition, temporarily close the 5 hole and arrange technological break until the process is complete shrinkage put sealant 7 (~12...24 hour). Because the viscosity of the sealant is less than that of other known compounds based on epoxy resin, it completely fills the gaps between the cables 4. After completion of the process of shrinkage of the sealant 7 through the top opening 6 again injected sealant in the upper part of the cavity when xperimentally data show, the shrinkage of the proposed sealing compound (G) in 2...3 times less than that of the epoxy (EC) or epoxy (Hetq) of the compound (see Fig.3).

1. The sealing composition based on epoxy resin with the curing agent in an effective amount, characterized in that the composition as epoxy resin contains epoxy Dianova resin and optionally the target component, which is used as the resin pyrolysis of solid fuels with a density at 20oWith no more than 1.06 g/cm3with nominal viscosity at 50oWith not more than 1.3 and/or liquid petroleum sludge density at 20oWith not more than 0.88 g/cm3with nominal viscosity at 50oWith not more than 1.5 s and a pour point not higher than -40oS, and the target component further comprises hexamethylenetetramine in an amount up to 1 wt.%, and the mass ratio of the epoxy resin and the target component is 15-20: 80-85.

2. Method of sealing cable openings boxes by introducing a sealing composition into the cavity opening, characterized in that the initially injected sealant under item 1 in the lower part of the cavity opening, with full control of its filling, and after shrinkage of processaudio fact, before you can use sealant receive in a single phase by mixing the components at the process temperature of not more than 25oWith, and use of the composition is carried out at the same temperature for up to 2 h after adding the hardener.

 

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