Metal wire insulating coating

FIELD: chemistry.

SUBSTANCE: coating comprises an adhesive sublayer of a thermoplastic adhesive and a functional layer of a nanostructured composite material based on polyethylene. The composite material of the functional layer has a polyethylene matrix and montmorillonite particles dispersed in the matrix in amount of 0.1-2 wt %.

EFFECT: improved physical and mechanical properties of the coating.

12 cl, 2 ex

 

The invention relates to insulating coatings on the metal wire, and can be used to cover wires intended for the manufacture of mesh structures such as gabions.

Products made of metal wire, often exposed to mechanical (abrasive), temperature, corrosion and other external influences. To protect the wire from external influences, it is applied insulating coating.

In the prior art it is known insulation coating of the wire, made from PVC (see, for example, THE 1275-001-42873191-2009). However, this coverage does not provide the wire required physical and mechanical properties required for its long-lasting use. PVC eventually decomposes, resulting in destruction of the coating, and the negative impact on the environment. Aggressive components of the decomposition products (complex chlorides) can react with contacting media (air, water, soil, rock), to form acidic compounds that contribute to the further destruction of the coating.

In the prior art it is known coating made of a polymer composite with a matrix of polyethylene and dispersively distributed in a matrix of particles of montmorillonite (MMT) (see the Materials of the conference "P2 Trough nanotechnology" - "Polymer-clay nanocompsites - better plastics", Nanocor, 25-26.09.2009 - prototype). The disadvantage of this coating is a low level of adhesion of the material to the metal wire. Accordingly, this coating can cause flaking, wrinkles and cracking, which would reduce the level of physico-mechanical properties of the coating and, accordingly, the wire.

Thus, it is desirable that the coating of metal wire had the following properties:

- high resistance to cracking,

- high resistance to aggressive environments,

- high temperature resistance,

- high resistance to frost,

- high adhesion to metal wire,

- high wear and abrasion resistance,

- if possible, high resistance to UV radiation.

Objective of the claimed invention is the provision of the required level specified properties.

The technical result of the claimed invention lies in the improvement of physico-mechanical properties of the insulating coating and the wire.

This technical result of the claimed invention is achieved due to the fact that the insulating coating of metal wire includes a functional layer of the nanostructured composite material based on polyethylene containing dispersed dispersed in a plastic matrix particles of montmorillonite, the ri that it further comprises adhesive sublayer of thermoplastic adhesive, placed under the functional layer, and a composite material, the functional coating layer contains 0.1 to 2 wt.% montmorillonite.

In addition, this technical result is achieved in particular cases the implementation of the invention due to the fact that:

the coating additionally contains zinc layer disposed between the surface of the wire and adhesive sublayer,

- thermoplastic adhesive adhesive sub-layer includes ethylene vinyl acetate, paraffin wax and epicanthal,

- thermoplastic adhesive further comprises a mineral filler and antioxidant

- functional layer used organomodified montmorillonite,

- montmorillonite particles have a plate shape, wherein the length of the plates is 100-200 nm, and the thickness of 2-6 nm,

- composite material of the functional layer further comprises at least one component selected groups: antioxidants, heat stabilizers, light stabilizers,dyes,

as antioxidants used phenolic resin,

as the stabilizers used phosphites,

as light stabilizers used amines employed,

as the dyes used metal oxides or carbon black,

the thickness of the adhesion of the coating layer is less than 1/10 of strata which are functional layer, the total coating thickness is not less than 0.5 mm.

The claimed coating, in contrast to the known analogue, has an additional sub-layer of thermoplastic adhesive, which increases the adhesion of the coating to the metal wire and, accordingly, preventing peeling and damage due to mechanical and other influences. The polymeric composite material of the functional layer covering the stated wire contains 0.1 to 2 wt.% montmorillonite. The inventors have found that specified the content of montmorillonite provides insulation covering the best combination of physical and mechanical properties.

The claimed coating is designed for use on any metal wire, such as wire, carbon steel.

The coating contains printed on the wire adhesion sublayer and the functional layer.

It may further include zinc layer density of 270 g/m2printed directly on the surface of the wire (placed before the adhesive sublayer).

Adhesive sublayer coating made of a thermoplastic adhesive (hot-melt). The choice of this material is due to the fact that thermoplastic adhesive is capable of repeatedly break into the melt when heated and harden when cooled, while it is well C is delivering on emptiness, has low shrinkage and high mechanical strength. Thermoplastic adhesive adhesive sublayer may include the following main components:

the ethylene vinyl acetate, paraffin wax and epicanthal;

amorphous poly alpha olefin (part APAO see APAO), polyisobutylene (rubber) and a petroleum resin,

machinesebony modified polyethylene wax, paraffin wax, petroleum resin and ethylene vinyl acetate;

machinesebony modified polyethylene wax, paraffin wax, petroleum resin and a polyolefin elastomer.

In addition, thermoplastic adhesive of the adhesion sublayer may additionally include a mineral filler and an antioxidant.

The functional coating layer is made of bimodal nanostructured polymeric material based on polyethylene (matrix)containing dispersively distributed in a matrix of particles of montmorillonite (0.1 to 2 wt.%). Montmorillonite (MMT or "nanogen") is a silicate having a layered structure. Preferably, in the composite material covering the IMT had a plate-form particles with dimensions: length - 100-200 nm, a thickness of 2-6 nm. The particles of montmorillonite to form a nanostructure, providing structuring polymer (polyethylene) at the time of crystallization (the effect of nucleation), which increases the physical and the Ko-mechanical material properties (strength, the modulus of elasticity, frost), and give the material a barrier properties (lower gas and vapor permeability), which increases the corrosion resistance of the material.

It is also preferable to use organomodified montmorillonite. For modification can be used, for example, Quaternary ammonium salt. In addition, nanostructured composite material of the functional layer may further comprise one or more of the following components: antioxidants (e.g., phenolic resin), stabilizers (for example, phosphites), light stabilizers (e.g., amines employed), elastomers, fillers (e.g., chalk), dyes (inorganic metal oxides, such as TiO2or soot). Also, the material of the functional layer may further include functional polyolefin, which increases the adhesion of the polymer composite material of the adhesion layer.

The thickness of the coating layers are preferably selected so that the thickness of the adhesion sublayer was less than 1/10 of the thickness of the functional layer, and the total coating thickness was not less than 0.5 mm.

The claimed coating is applied by pulling the metal wire through a bath of heated thermoplastic adhesive. Then the wire is heated to the softening temperature of the adhesive and put options the regional layer by extrusion of polymer composite material using the extrusion head.

Example 1

Coating for steel wire with a diameter of 2.7 mm, containing:

1) Zinc layer density of 270 g/m2

2) Adhesive sublayer:

Thermoplastic adhesive containing the following components, wt%:

the ethylene vinyl acetate 20-25,

- paraffin wax 20-30,

- epicanthal 30-40,

mineral filler 10-30,

- antioxidant 0.5 to 1.0.

The thickness of the sublayer 0,05-0,12 mm

3) Functional layer:

Nanostructured composite material based on polyethylene, containing the following components, wt%:

HDPE (polyethylene) - 50-70,

LLDPE (polyethylene) - 15-40,

MMT - 0,1-2,

Carbon black (dye) - 0,5-2,

Elastomer 5-10,

Functional polyolefin 2-4%,

Chalk (filler) - 3-5%

Thermo stabilizer "Irgafos-168" 0,1-0,5%,

Light "Tinuvin-944" 0,1-0,5%,

Antioxidant "Irganox" Of 0.1-0.5%.

The layer thickness of 0.5-0.75 mm.

Example 2

Coating for aluminum wire with a diameter of 2 mm, containing:

1) Adhesive sublayer:

Thermoplastic adhesive containing the following components, wt%:

the ethylene vinyl acetate 40,

- petroleum resin 30,

- paraffin wax 25,

- machinesebony modified polyethylene wax 5.

The thickness of the sublayer 0,05-0,12 mm

2) Functional layer:

Nanostructured composite material based on polyethylene, containing the following to mponent, wt.%:

HDPE (polyethylene) - 50-70,

LLDPE (polyethylene) - 15-40,

MMT - 0,1-2,

Carbon black (dye) - 0,5-2,

Elastomer 5-10,

Functional polyolefin 2-4%,

Chalk (filler) - 3-5%

Thermo stabilizer "Irgafos-168" 0,1-0,5%,

Light "Tinuvin-944" 0,1-0,5%,

Antioxidant "Irganox" Of 0.1-0.5%.

The layer thickness of 0.5-0.75 mm.

These design and composition of the coatings provide a reduced likelihood of it cracking. This increases the operational properties of the coating, in particular, wear resistance, temperature resistance, cold-resistance and corrosion resistance.

It should be noted that the claimed invention is not limited to particular cases of its implementation, disclosed in the description. Possible other forms of execution are considered coverage in the amount of the essential features of the invention.

1. Insulation coating of metal wire containing functional layer of the nanostructured composite material based on polyethylene containing dispersed dispersed in a plastic matrix particles of montmorillonite, characterized in that it further comprises adhesive sublayer of thermoplastic adhesive, placed under the functional layer, a composite material, the functional coating layer contains 0.1 to 2 wt.% montmorillonite.

2. P is a covering according to claim 1, characterized in that it further comprises a zinc layer disposed between the surface of the wire and adhesive sublayer.

3. The coating according to claim 1, characterized in that thermoplastic adhesive of the adhesive sub-layer includes ethylene vinyl acetate, paraffin wax and epicanthal.

4. The coating according to claim 3, characterized in that thermoplastic adhesive further comprises a mineral filler and an antioxidant.

5. The coating according to claim 1, characterized in that the functional layer is used organomodified montmorillonite.

6. The coating according to claim 1, characterized in that the particles of montmorillonite have a plate shape, wherein the length of the plates is 100-200 nm, and the thickness of 2-6 nm.

7. The coating according to claim 1, characterized in that the composite material of the functional layer further comprises at least one component selected from the group of: antioxidants, heat stabilizers, light stabilizers, and dyes.

8. The coating according to claim 7, characterized in that the quality of the antioxidants used phenolic resin.

9. The coating according to claim 7, characterized in that as the stabilizers used phosphites.

10. The coating according to claim 7, characterized in that as light stabilizers used amines employed.

11. The coating according to claim 7, characterized in that the dyes ispolzovanie metals or soot.

12. The coating according to claim 1, characterized in that the thickness of the adhesion of the coating layer is less than 1/10 of the thickness of the functional layer, the total thickness of the coating is not less than 0.5 mm



 

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