Composition for the surface treatment of leather goods

 

(57) Abstract:

The inventive source components, including, wt.%: polyetherurethane on the basis of simple polyetherdiol with the addition of 0.5-3 wt.% polyfluorinated - alcohols - telomere General formula , where n= 10, 12, 15-20, rosin 0,4-1,0; hexamethylenetetramine 0.5 to 1.2; pigments 5,0-9,0; 1,3-dioxolane - the rest may of 0.4-0.5 wt.% ethoxylated higher fatty alcohols, stirred until the formation of homogeneous solution. Viscosity at 20oC 30-100 c, the resistance of the coating to 9 days according to GOST 9,403-80.1 C.p. f-crystals, 4 PL.

The invention relates to compositions used in light industry, in particular to compositions based on polyurethanes, intended for use in the leather industry and consumer services for the dyeing of natural leather, restoration and retouching leather footwear and leather haberdashery.

Known composition for the surface treatment of leather products, including thermoplastic polyurethane, diethylamine and high-boiling organic solvent is dimethylformamide, in the following ratio, wt.h.

Polyurethane 100

Diethylamin 0,05-5,0

Restoredeletedfiles, which because of its high boiling point (153oC) and a low maximum allowable concentration of vapours in the air of working zone (MPCp. C.=10 mg/m3prevents rapid drying of the coating and leads to increased disutility of production. In addition, the viscosity of solutions of thermoplastic polyetherurethane on the basis of polyethers in amide solvents not sufficiently stable in storage.

The closest is a composition for the repair of leather goods, consisting of thermoplastic polyetherurethane, polyvinylchloride resin, pigment titanium dioxide and high-boiling solvent of dimethylformamide in the following ratio, wt.h.

Polyurethane 100

PVC resin 50-80

Titanium dioxide 10-20

The solvent 200-300.

The disadvantages of this structure are the high toxicity of the used solvent, a large drying due to the high boiling point of dimethylformamide, short duration storage due to the low stability of the rheological properties of the solution. In addition, the composition of the inherent low resistance.

The purpose of the invention, the improved stability of the composition during storage is drying.

The objective is achieved in that the composition for surface treatment of leather products, including linear polyetherurethane, a pigment and a solvent, contains as polyetherurethane connection based polyetherdiol (polifonica or lapola), diethylene glycol and 0.5-3.0 mass. polyfluorinated alcohol telomere , where n=10,12, as a solvent of 1,3-dioxolane (trivial name "formalistically"), as well as rosin and hexamethylenetetramine (urotropine), in the following ratio, wt.

Polyetherurethane 15,0-20,0

Rosin 0,4-1,0

Hexamethylenetetramine 0.5 to 1.2

Pigments 5,0-9,0

1,3-Dioxolane Else.

The composition may additionally contain 0.3 to 0.5% surfactant ethoxylated higher fatty alcohols (type Sintana DT-7, DC-10", "Oxana P2, P3, and others). The relationships between the components are chosen experimentally and is optimal. When the content in the composition is more than 20% of polyetherurethane significantly increases its viscosity, the deterioration in the flowability of the composition and adhesion of the resulting coating to a substrate. The use of thermoplastic polyurethane based on simple rather than complex polyetherdiols, extends temperature and is of referenten as a regulator chain polyfluorinated alcohols - telomere: 1,1,11-digitalconvergence (TU 6-02-884-79) and 1,1,13 - trihydrateclavulanate (TU 6-02-884-79) in the stated quantities provides high resistance products coated.

Rosin acts as adhesive agent, increasing the bond strength between the applied coating and skin. Rosin may be tall, pine or extraction. Methenamine is an inhibitor of acid polymerization used in the proposed composition of the solvent is 1,3-dioxolane.

Ethoxylated higher fatty alcohols are effective dispersers of inorganic pigments, as well as for a better spreading of the composition on the surface of the leather products.

As the pigments may be any of inorganic pigments corresponding dispersion, as well as any organic dyes, dissolved in 1,3-dioxolane. It's preferable to use pigments and dyes, not to have acidic properties.

Proposed as solvent of 1,3-dioxolane (cyclic acetal is a movable transparent low-boiling liquid (so Kip. 75-76oC) with respect to thermoplasty is tima concentration of vapours in the air of working zone (MPCp. C.) is equal to 50 mg/m3that corresponds to the low hazard class of chemical compounds according to GOST 12.1.005-76.

The composition is prepared as follows:

In the reactor volumetric type, equipped with a mechanical stirrer and reflux condenser at room temperature upload 1,3-dioxolane, methenamine, rosin, thermoplastic polyurethane and, if necessary, a surfactant. Components are mixed at a temperature of 25-40oC (within 2-4 hours) before the formation of a homogeneous solution of varnish. When using a soluble organic dye composition can be prepared directly in the mixer, where they are provided with a lacquer. If the use of inorganic pigments, the resulting varnish after cooling to room temperature, poured or drum ball mill, or in the capacity of a bead mill, there is injected and pigments. After dispersing the resulting composition was filtered, after which the produce is packaged in a container.

The proposed composition is applied either by brush or by spraying. In the latter case, it must be diluted with solvent to the desired viscosity. If the storage of the composition there is a natural salustiana, it is also necessary RA is relevant to the applied color pigment. The flow rate of the composition at 1 m2cover the surface of 40-120 g; viscosity at 20oC viscometer VZ-246 with a nozzle diameter of 4 mm 30-100 C. the drying Rate of the coating to the extent 3 does not exceed 20 min (GOST 19007-73). Operating characteristics (resistance to bending and abrasion resistance, frost resistance) and physical-mechanical properties of the formed films of the claimed composition is at the level of existing funds for a similar purpose, but surpasses them in water resistance.

The formulation characteristics of the compositions and properties obtained on the basis of polyurethane coatings illustrate the examples.

Example 1. In table. 1 shows the composition of the claimed composition and its properties, and table. 2 characteristics obtained on the basis of the coatings deposited on low-fat samples of genuine leather.

Song from beyond the stated concentrations of the components have either high viscosity (poor fluidity, reducing adhesion of coatings), or increased consumption per unit of the covered area due to poor coverage. When the number of polyetherurethane in the composition deteriorates and the elasticity of the coatings.

If used in the claimed compositions is less than 0.4% of the rosin, the applied coating is easily peeled from the leather surface.

Example 3. In table. 4 presents the dependence of the resistance of the coating of the proposed composition depending on the number of polyfluorinated alcohol-telomere n-10, used in the synthesis of polyurethane. The composition of the following composition, thermoplastic polyurethane based on toluylene diisocyanate and polifonica mol. m 1000-20,0; pine rosin 0,6; + 1,0; carbon black furnace 6,0; sintana DT-7; 0,2; 1,3-dioxolane 72,2.

As can be seen from the table.4, in the absence of paliperidonesee the water resistance of the resulting coatings is significantly lower.

Thus, the data presented in the examples show that the introduction of the proposed composition of 1,3-dioxolane and linear polyetherurethane synthesized with the addition of polyfluorinated alcohols-telomeres, allows 2-5 times to reduce the drying time of the coating, a 1.5 fold increase its resistance and, in addition, to reduce the toxicity of the composition and to significantly improve the stability of its properties during storage.

1. Composition for the surface treatment of leather products, including whether the t connection on the basis of simple polyetherdiol with the addition of 0.5 to 3.0 wt. polyfluorinated alcohols-telomere General formula where n is 10 and 12, and the solvent of 1,3-dioxolane, and additionally contains rosin and hexamethylenetetramine in the following ratio, wt.

The specified polyetherurethane 15 20

Rosin 0,4 1,0

Hexamethylenetetramine 0,5 1,2

Pigments 5 9

1,3-Dioxolane Else

2. The composition according to p. 1, characterized in that it further comprises from 0.3 to 0.5. ethoxylated higher fatty alcohols.

 

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