Thermoplastic composition for marking road

 

(57) Abstract:

The invention is used as a material for marking the roadway with asphalt concrete pavement. The composition includes a film-forming substance, a plasticizer, titanium dioxide, antiegalitarian additive, glass beads and mineral filler. As film-forming binders used solid polyester resin, containing in its composition to 55% of terephthalic acid, plasticized with one or more substances. The number of components in specific proportions (wt. %) allows to reduce the brittleness and increase the elasticity of thermoplastic composition for marking of the roadway. table 1.

The invention concerns the establishment of a composition for marking the roadway with asphalt concrete pavement to ensure road safety.

The number of known compositions road-marking coatings (PDA), which differ from each other primarily by the type of film-forming defining the main technical characteristics of the material. This is due to differences in the requirements for the PDA, climatic conditions, availability of raw materials and production Emeishan modifier used polyacrylates, copolymers of acrylates with styrene. Such binder used in the Japan patent (application 496976, MKI5C 09 D 4/02, C 09 D 5/00). In the patent of Russia 2083374, MKI6B 32 B 5/16, E 01 F 9/00 as polymeric bases are applied polyurethane and a mixture of polyester resin (patent of Russia 2074872, MKI6C 09 D 167/02).

In other domestic developments thermoplastic marking compositions as used by various film-forming solid polyester resin in combination with plasticizers (USSR author's certificate 826733, CL E 01 F 9/04; patent of Russia 2074921, C1 E 01 F 9/04).

The closest analogue is the composition of a polyester resin comprising a plasticizer, a pigment, antiegalitarian and lighting additives and filler (patent of Russia 2074921, C1 E 01 F 9/04).

Disadvantages it is the increased brittleness at low temperatures and as a consequence not enough high durability on the road.

The invention solves the problem of improving the film-forming substance from the point of view of reducing fragility, increase elasticity, and the whole mixture as a whole.

These goals are achieved as follows.

1. By using the polyester is the number to 55%, which reduces the glass transition temperature of the PDA 5-7oC.

The resin is obtained by polycondensation of aliphatic glycols (C2-C5) (ethylene glycol, di - and triethylene glycol, neopentylglycol and others) and duotronic aliphatic acids not less than C4(phthalic anhydride, terephthalic acid in pure form or in the form of dimethyl terephthalate, polyethylene terephthalate, and others ), for example, taken in the following ratio, %:

The glycol - 31-28

Phthalic anhydride is a 41-17

Terephthalic acid - 28-55

Synthesis of polyester resins is carried out with a stepwise increase in temperature from 160 to 250oC to obtain the desired softening temperature of the resin.

2. Use as a plasticizer compounds containing in their structure only aliphatic fragments.

As is known, these compounds improve the frost resistance unlike plasticizers containing aromatic fragments.

Given the polarity of the polyester resin for plasticization, were used polyesters with an acid number of from 0 to 80 mg KOH/g based on aliphatic dibasic acids (not less than C4) (adipic, azelaic, sabotinova and others) and aliphatic gli is a mini-polyesters is carried out at a stepwise increase in temperature from 130 to 220oC to obtain the desired acid number.

The use of such plasticizers in combination with the above-mentioned polyester resin reduces the temperature brittleness at 10-13oC (Fraas).

Composition for marking the roadway includes a film-forming substance in the form of a polyester resin containing up to 55% of terephthalic acid, with a melting point of at least 70oC, a plasticizer, a complex of the polyester based on aliphatic dibasic acids (not less than C4and aliphatic glycols (C2-C5), as well as titanium dioxide, antiegalitarian additive (kaolinite and others), glass beads, mineral fillers (quartz sand, quartz and glass crushed, carbonates and others).

The content included in thermoplastic composition of the following components, percent:

Polyester resin - 15-30

Plasticizer - 3-10

Titanium dioxide - 4-10

Antidementia additive - 3-10

Glass beads - 0-30

Mineral filler - Rest

The results are illustrated by examples.

Example 1.

Take a sample of components for a particular part of the PDA (see table) is smetacek coating is used for drawing on the asphalt and for sample preparation.

Thermoplastic composition for marking of the roadway, including film-forming substance, a plasticizer, titanium dioxide, antiegalitarian additive, glass beads, mineral filler, characterized in that used as film-forming polyester resin, containing in its composition to 55% of terephthalic acid, with a melting point not lower than 70°C and as plasticizers - polyesters with an acid number of from 0 to 80 mg KOH/g based on aliphatic dibasic acids not less than C4and aliphatic glycols (C2-C5), and its constituent components are taken in the following ratio, wt.%:

Polyester resin is 15 - 30

Plasticizer - 3 - 10

Titanium dioxide - 4 - 10

Antidementia additive - 3 - 10

Glass beads - 0 - 30

Mineral filler - Rest

 

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