Silanol-crosslinkable composition for cable insulation

FIELD: chemistry.

SUBSTANCE: invention relates to crosslinkable compositions based on polyolefins and copolymers thereof and modifiers for producing silanol-crosslinkable polymer compositions which can be used to produce film coatings, insulation and sheaths for cables and conductors for different purposes. The silanol-crosslinkable composition contains polyolefin, vinyl alkoxysilane, organic peroxide and a sheet silicate which is modified with resorcinol resin with ratio of the resorcinol resin to the sheet silicate of 6:10 pts.wt.

EFFECT: improved operational characteristics, shorter crosslinking time and longer property retention time.

6 cl, 2 tbl

 

The invention relates to the manufacture of polymeric products, namely slivaushiesia compositions based on polyolefins and their copolymers and modifiers to get cyanoliseus polymer compositions that can be used for film coating, such as insulation and sheath of cables and wires for various purposes.

The invention relates to polyolefin halogen containing compositions, slivaushiesia using organosilane in the presence of the initiator is an organic peroxide.

To improve the operational characteristics of the polymer compositions, for example, increased thermal stability, increased elastic modulus, modify them by means of various additives.

The analysis carried out in recent years, domestic and foreign studies indicate a high potential of research in the field of polymer nanocomposite materials constituting the polymers filled with nanoparticles that interact with the polymer matrix is not at the macro and at the molecular level. Due to this interaction produces a composite having a high adhesive strength of the polymer matrix of the nanoparticles.

Of most interest are polymer composites based on modified layered silicates, which are widely RA is widespread possible to extend and well-known as various species of clays. Preference among these is given bentonitowa rocks clays, which include not less than 70% of the mineral montmorillonite, thanks to its capacity for adsorption of various ions (mainly cations), and ion exchange.

The main disadvantage of layered silicates is a sharp drop in strength when wet, liquefaction under dynamic impact, swelling in flooding and shrinkage during drying. The hydrophilic binder is the reason for their incompatibility with the organic polymer matrix. This problem can be solved by modification of clay and organic matter.

There are various properties of clays. As organomodified layered silicates (OMSS) use of substances of different chemical nature of ionic and non-ionic origin. Ion organomodified used Quaternary ammonium salts (H) with aliphatic (hydrocarbon) radicals in which the number of methylene (-CH2-) groups varies from 14 to 18. In addition to the aliphatic radicals can be used, and other Quaternary ammonium salts, including those containing polar functional groups, for example, hydroxyethylamine or polyhydroxyethyl.

For example, a known polymer composition for insulation of wire and cable sheathing different significance is to be placed, representing stitched peroxides polyethylene, includes layered silicate, in particular, montmorillonite, modified Quaternary ammonium salts to impart hydrophobicity or, in other words organophilicity. The composition has a fire resistance, low smoke emission, low corrosivity, low toxicity [1].

A disadvantage of known composition is the length of the fusion process and the fact that this type of songs does not tolerate the presence of even traces of moisture (less than 500 ppm). Otherwise, moisture promotes pre-unwanted-linking of the polymer directly in the extruder, which, in turn, leads to a significant deterioration of the surface quality of the product and increase the number of electrical breakdowns applied to the wire insulation.

When used as a modifier silicates HOUR drying process is difficult, and received organogeny contain more than 2% water, which is accumulated and stored organomodified clay.

Completely different product, radically different chemistry matching is silanandabhivamsa composition of polyethylene.

Known silanandabhivamsa composition for manufacturing insulation membranes cable products, including polyolefin 93,5÷99,3% wt., vinylacetylene 0,1÷3,0 wt. -%, organic peroxide 0,1÷0,4% m is SS. and synergists - else, the presence of which provides high thermal deformation, and resistance to thermoelectron aging at elevated temperatures, and eliminates the possibility of premature crosslinking [2].

A disadvantage of the known solutions is the difficulty of obtaining through the use of specific compounds synergists, and, consequently, high cost of raw materials; a long time knitting; poor physical and mechanical characteristics of the products.

Solved by the invention is to improve the quality of products and simplifying the manufacturing process of the composition and increase shelf life.

The technical result is to eliminate these drawbacks and to make it possible to drain organogeny to a value of not more than 500 ppm, and to give the clay the resistance to moisture during storage to a value of not more than 1000 ppm., so you can increase performance and reduce the time knitting.

This result is achieved in that silanandabhivamsa composition comprising a polyolefin, vinylacetylene and organic peroxide, contains layered silicate modified resorcinol resin (PC) of the following structure

When the content of the components in the following ratio: polyolef is n (93,5÷99,3) mass, willcoxson (0,5÷2,0) mass, organic peroxide (0,1÷1,5) mass, organomodified layered silicate modified resorcinol resin (0,1÷3,0) mass

The ratio of the polyolefin modifier PC and layered silicate (clay) is 6 machine hours: 10 machine hours, respectively.

Additional technical result is achieved in that the composition as a polyolefin contains polymers of ethylene, copolymers of ethylene and alpha-olefins, preferably polyethylene low density polyethylene linear low density polyethylene, high density; organic peroxides composition contains peroxides classes of hydroperoxides, dialkylamides, dialkylamides, alkyl-aralkylated, PROXIFIER, preferably, dicumylperoxide.

The composition may contain a crosslinking catalyst, for example, dilaurate dibutylamine, for example, in an amount of 5 wt. parts concentrate catalyst crosslinking.

The use of layered silicate treated resorcinol resin for modification of the composition silanandabhivamsa polyethylene, is a significant contrast to all known from the prior art solutions.

It is established that the introduction of layered silicate from 6 machine hours to 10 M.Ch., PC helps improve the process of exfoliation of the clay and, as a consequence, to increase the mechanical and dolgovremennye characteristics of the final composition, compared with similar compositions.

To speed up the process of stitching can be used catalyst. The preferred catalyst is dilaurate dibutylamine.

The present invention can be izgotovlenie SIOPLAS technology, namely, that in the manufacture of insulation combines two components: silanolate polyolefin and concentrate crosslinking catalyst, and which can be dilaurate dibutylamine.

A composition consisting of a mixture silanolate polyolefin and concentrate catalyst is closed under the action of water.

99,3
Table 1
Implementation of the invention can be confirmed by the following examples
ComponentThe compositions in examples Mascali
123456 comparison
Linear low-density polyethylene93,594959998,1
Vinylacetylene0,51,51,81,82,01,8
Dicumyl peroxide0,110,10,11,50,1
Organomodified montmorillonite, modified resorcinol resin0,10,51,03,00,80

Comparative physico-mechanical properties are shown in table 2.

Table 2
PropertyThe properties of formulations in mixtures with 5 mass concentrate catalyst after stitching
123456 comparison
The tensile strength, MPa14,516,717,115,2of 17.513,8
The change in tensile strength after 240 hours of thermal aging at 135°C, %221515251060
The time to reach the maximum degree of crosslinking in a water bath at 90°C, minutes656045405090
Thermal deformation, %8070605560100

The obtained results show significant improvement in properties silanandabhivamsa compositions with modified layered silicate treated resorcinol resin. The obtained rates surpass not only the characteristics of the composition of the prototype, but also compositions comprising ora is Nagini, modified HOURS.

Polymer composition characterized by a minimal set of features needed to provide a specific result, but not excluding the presence of any other components. This composition can be considered as the basis and to be useful in the production of polymer compositions for various purposes. Products made using the proposed composition, due to the property of layered silicate treated resorcinol resin have superior performance and long time preservation of the properties of the final composition.

The sources of information.

1. GB 2367064, publ. 27.03.2002, C08F 255/02, C08L 23/02

2. EN 2440633, publ. 28.09.2012, H01B 3/44.

1. Silanandabhivamsa composition for cable insulation, comprising a polyolefin, vinylacetylene and organic peroxide, characterized in that it contains a layered silicate modified resorcinol resin (PC) of the following structure:

in the following ratio of components, parts by weight:

the polyolefin93,5÷99,3
vinylacetylene0,5÷2
organic peroxide0,1÷1,5
layered silicate modified
resorcinol resin0,1÷3,0

when the ratio resorcinol resin
and the layered silicate is 6:10 parts by weight of

2. The composition according to claim 1, characterized in that the polyolefin contains polymers of ethylene, copolymers of ethylene and alpha-olefins, preferably polyethylene low density polyethylene linear low density, high density polyethylene.

3. The composition according to claim 1, characterized in that as organic peroxides contain peroxides that are related to classes of hydroperoxides, dialkylamides, dialkylamides, alkylarylsulphonates, PROXIFIER, preferably dicumylperoxide.

4. Composition according to any one of claims 1 to 3, characterized in that it contains a catalyst for the crosslinking.

5. The composition according to claim 4, characterized in that it contains 5 parts by weight of the concentrate catalyst crosslinking.

6. The composition according to claim 5, characterized in that the crosslinking catalyst contains dilaurate dibutylamine.



 

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