RU2217459C1 - Thermoflexible plastic composition - spray-plastic for a highway bed traffic-bearing surface marking by spraying under pressure - Google Patents

Abstract

FIELD: road-building. SUBSTANCE: the invention presents a thermoflexible plastic composition - a spray - plastic used for a highway bed asphaltic concrete pavement surface traffic signs marking by spraying under pressure. The composition besides a film-forming component - polyester resin containing up to 55 mass. % of terephthalic acid with softening temperature of no less than 70 C, a plasticizer composed of a mixture of polyester resin based on aliphatic diatomic acids and aliphatic glycols and a product of decomposition of polyethyleneterephthalate by ethylene glycol, titanium dioxides, an antisedimentation additive, a mineral filler, - additionally contains surfactants and wax. EFFECT: the combination of components in a definite ratio allows to reduce viscosity of a material melt, to increase its strength and to reduce abradability. 1 cl, 1 tbl, 3 ex

Description

 The invention relates to the creation of a composition for marking a roadbed with an asphalt concrete coating in order to ensure road safety.

 It is known that the simplest of the devices for applying marking lines is a scraper carriage. An extruder is a more complex and modern type of technological equipment for applying lines. With scraper and extruder marking technology, so-called “thick-layer” lines are obtained: line thickness 3-4 mm.

 The third mechanized way of applying marking lines of thermoplastic materials is the technology of spraying (spraying) the melt onto the coating under high pressure. When using this technology, these materials must have a specially selected composition, which ensures their finer-dispersed structure and the required melt viscosity. They are called spray plastics.

 Using this technology, a marking layer thickness of the order of 1 mm is obtained.

 The company "NOR-SKILT" is one of the largest European manufacturers of road marking materials, including spray plastic, in our country, spray plastic is not available.

 Meanwhile, it can be used both for repairing old markings and for applying new lines to replace paints both with solvents and with water-borne ones.

The advantage of spray plastic over paints is as follows:
- environmental friendliness when applied due to the absence of solvents,
- the possibility of applying to the old marking without demarcation,
- the time between marking from spray plastic and the opening of the road is reduced to 1-2 minutes, which is 5-10 times less than for paints and plays a big role for roads with heavy traffic.

 One of the requirements for spray plastic in foreign companies ("NOR-SKILT") is greater hardness, greater abrasion resistance compared to extruder plastic. In addition, the spray plastic must have a spreadability that is twice as large.

The closest analogue to the claimed is a thermoplastic composition for marking the roadway, including as a film-forming substance a polyester resin containing up to 55 wt.% Terephthalic acid with a softening temperature of at least 70 ^o C, a plasticizer, titanium dioxide, anti-sedimentation additive, glass beads and mineral filler (see RU 2167901, publ. 27.05.2001).

 Its disadvantage is that it cannot be used for application to the roadway by spraying under pressure due to the high viscosity of the melt, and also due to insufficient strength and resistance to abrasion.

 The invention solves the problem of creating a thermoplastic composition of the spray plastic for marking the roadway by spraying under pressure with the possibility of applying to the old marking without demarcation, reducing the time between marking with spray plastic and opening the road to 1-2 minutes, and also to increase strength and reduce the abrasion of the material.

The task is achieved in that the thermoplastic composition of the spray plastic includes a film-forming substance - a polyester resin containing up to 55 wt.% Terephthalic acid with a softening temperature of at least 70 ^o C, a plasticizer, titanium dioxide, anti-sedimentation additive, glass beads, mineral filler , characterized in that it additionally contains wax and surfactants in an amount of 0.2-1.5 wt. hours per 100 parts by weight the sum of the remaining components with a mass ratio of wax: surfactants from 70/30 to 10/90, and as a plasticizer includes a mixture of a polyester based on aliphatic dibasic acids of at least C ₄ and (C ₂ -C ₅ ) aliphatic glycols with acid number from 0 to 80 mg / KOH and the degradation product of polyethylene terephthalate ethylene glycol in a mass ratio of 30 / 70-70 / 30 in the following ratio of components, wt.%:
Specified Polyester Resin - 25-35
The specified plasticizer is 3-7
Titanium dioxide - 4-10
Anti-sedimentation supplement - 3-10
Glass beads - 0-30
Mineral Filler - Else
Obtaining a polyester resin is described, for example, in RU 2167901.

 As surfactants, fatty acids (e.g., stearic or olefinic acid, etc.), salts of fatty acids (e.g., Zn, Ba, Ca, etc.) and any other surfactant can be used.

 As waxes can be used as polyolefin (polypropylene wax, polyethylene wax, for example PV-200), amide waxes, montan waxes, as well as waxes of various nature.

As one of the components of the plasticizer, the degradation product of polyethylene terephthalate ethylene glycol was used, which is a white solid opaque substance with a melting point of 135-145 ^o C.

It was obtained, for example, by the destruction of polyethylene terephthalate with ethylene glycol, obtained at a mass ratio of 2.62 to 2.65 in the presence of 0.3-0.5% catalyst (two-water zinc acetate) in a reactor with a stirrer and reflux condenser while heating the reaction mass to a temperature of 200 ± 5 ^o C and holding at this temperature for 5 to 8 hours until a homogeneous liquid mass with a low viscosity is obtained, upon cooling which a solid opaque white substance is obtained, having a melting point from 135 to 145 ^o C.

Examples illustrating the invention (specific compositions are shown in the table)
Take samples of the components: polyester resin, plasticizer (a mixture of the above components) and the remaining components indicated in the table, mix and melt at a temperature of 200-210 ^o C for 5 hours. The process is carried out with a mass ratio of wax: surfactant 50/50. The specified plasticizer is obtained by mixing the components in a mass ratio of 50/50. The resulting mixture of road marking is used for applying to asphalt and for preparing samples.

Claims (1)

Thermoplastic composition of spray plastic for marking the roadway by spraying under pressure, including a film-forming substance - a polyester resin containing up to 55 wt.% Terephthalic acid with a softening temperature of at least 70 ° C, plasticizer, titanium dioxide, anti-sedimentation additive, glass beads, mineral filler, characterized in that it additionally contains wax and surfactants in an amount of 0.2-1.5 wt.h. per 100 parts by weight the sum of the remaining components, with a mass ratio of wax: surfactants from 70/30 to 10/90, and as a plasticizer includes a mixture of polyester based on aliphatic dibasic acids of at least C ₄ and (C ₂ -C ₅ ) - aliphatic glycols with an acid number from 0 to 80 mg / KOH and the degradation product of polyethylene terephthalate ethylene glycol in a mass ratio of 30 / 70-70 / 30, with the following ratio of components, wt.%: Specified Polyester Resin 25-35 The specified plasticizer 3-7 Titanium dioxide 4-10 Anti-sedimentation supplement 3-10 Glass beads 0-30 Mineral filler Else

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