One-pot lacquer coating composition

FIELD: varnish-and-paint industry.

SUBSTANCE: invention relates to polyurethane coatings intended to be applied on a variety of surfaces (metal, wood, etc.). Composition comprises toluene solution of hydroxyl-containing component and toluene solution of polyisocyanate. Hydroxyl-containing component is oligoether obtained by in-melt reaction of tall oil with triethanolamine at 170-200°C and characterized by viscosity at most 10000 mPa·s, acid number at most 5.0 mg KOH/g and hydroxyl number 125-138 mg KOH/g. Oligoether-to-polyisocyanate ratio is 1:1.

EFFECT: enabled preparation of two-component lacquer with elevated light resistance, water resistance, and stability, which is suitable for anticorrosive coatings on metal products.

3 cl, 1 tbl

 

The present invention relates to the chemical industry, in particular to the paint industry, and the receipt of polyurethane coatings designed for application to various surfaces (metal, wood etc).

Known polyurethane composition for application of protective coatings containing polyurethane binder derived from hydroxyl-containing component and the diisocyanate, the hydroxyl-containing component it uses monoethanolamine and/or diethanolamine (aminoalcohols); as the isocyanate component used toluylenediisocyanate (SU 97812, 04.10.51).

Lacquer composition is prepared by the sequential receipt of the ester by the esterification of a mixture of amerosport, such as diethanolamine and glycerol adipic acid at 180-200°and joint obtained by dissolving the ester in the role of a hydroxyl-containing component and diisocyanate in cyclohexanone at a ratio of ether diisocyanate and 2:1 respectively. The obtained varnish forms a uniform coating with high gloss. This varnish, however, has low viability because it contains the diisocyanate has a greater reactivity towards hydroxyl-containing compound (ether). During heating of such systems, for example to 160-180°With the release occurs is of isocyanate groups, which, engaging in interaction with the hydroxyl-containing polyester, to form a polyurethane reticulated structure.

Traditionally, the hydroxyl-containing component upon receipt of such varnishes are widely used polyethers (interaction products of polyols with olefin oxides), polyesters, such as products of the interaction of phthalic anhydride and dicarboxylic acids with glycols and polyhydric alcohols. And to increase the speed of curing to a one-component lacquers (polyurethanes), curing air moisture, add a catalyst, such systems are referred to as two-component systems. Curing air moisture polyurethanes receive, for example, the simple interaction of hydroxyl-containing polyesters in excess of MDI and they are prepolymers with free isocyanate groups.

Known composition for a covering of floors, comprising a urethane prepolymer on the basis of 2,4-toluylene diisocyanate and preterition the triethanolamine castor oil, organic solvent, mineral pigment and Tulum (technical calcium aluminates) (SU 1235887, 07.06.86). Known composition forms a coating with high wear resistance, but is intended only for flooring.

To obtain polyurethane paints, and p is lauretano in General, as a basis for numerous materials for various purposes are widely used as peroxidebased component different alcidi, thus receiving Uralkaliy resin. As alkido products for the interesterification of oils polyhydric alcohol in an environment of white spirit or xylene with additional processing of the product of the alcoholysis dicarboxylic acid or its anhydride. Further, hiroshimastrasse Alcide is treated with a diisocyanate, and to ensure the stability of uralkyd enter 1-3 wt.% opiates chain alcohols, amines). (See the Handbook edited MLA Raw materials and intermediates for paint materials”), Chemistry, 1978, 164-165).

As vegetable oils upon receipt of such uralkyd use usually drying, poluvysyhayuschee oils and their mixtures, such as linseed oil, castor digidratirovannogo.

So, known as gidroksilsodyerzhascimi component product of the interaction of tall oil and triethanolamine at 150-170°in the presence of potassium hydroxide (SU 1650682, 23.05.91). The obtained target product with a hydroxyl number 100-950 mg KOH/g used as the hydroxyl-containing component of this product allows us to give him both the properties of the catalyst retinoblastoma and trimerization.

The closest to the technical nature of the claimed invention is a known two-component lacquer, representing a solution in toluene of the products of interaction between the Oia preterition the triethanolamine castor oil with an excess of diisocyanate (see also the Handbook edited MLA, s).

The resulting lacquer is cured in air at 18-22°C and relative humidity 5-85% without added catalyst and forms a coating with good mechanical and protective properties, but when it is getting toluylenediisocyanate taken in excess, making the product more toxic and non-uniform. In addition, the coatings do not have the necessary hardness and resistance to light and are designed to produce coatings mainly wood and concrete coatings.

The technical task of the present invention to provide a two-component varnish with high light fastness, water resistance, hardness, and the possibility of its use for anti-corrosion coatings of metal.

The goal of the project is achieved in that two-component lacquer composition for coating comprising a solution in toluene of hydroxyl-containing component and solution in toluene MDI contains as hydroxyl-containing component oligoether - product interaction in the melt at 170-200°tall oil and triethanolamine, with a viscosity of not more than 10000 MPa·C, acid value not more than 5.0 mg KOH/g and a hydroxyl number 125-138 mg KOH/g, the ratio of oligoether and MDI 1:1.

Upon receipt of oligoether use, for example, the R, tall oil 70-80 wt.% and 20-30 wt.% triethanolamine.

The resulting oligomer may further comprise a 0.02-0.03 wt.% polydimethylsiloxane, such as the brand PMS-200, based on oligoether.

Two-component varnish composition according to the invention was prepared as follows.

First get gidroksilsodyerzhascimi component oligoether by the interaction of molten tall oil and triethanolamine in the ratio of their 70-80 wt.% and 20-30 wt.% respectively. The process is carried out at 170-200°process control to obtain the product (oligoether) with a viscosity of not more than 10000 MPa·C, acid value not more than 5.0 mg KOH/g and a hydroxyl number 125-138 mg KOH/g Next, the resulting oligomer dissolved in toluene.

When preparing the solution oligoether or in the process of getting it (oligoether) if necessary add a modifier polydimethylsiloxane, such as the brand PMS-200, which improves the final properties of oligoether.

Next, in the obtained solution oligoether enter solution in toluene MDI (polyisocyanate component). The obtained varnish atvriders in air at 18-22°C and relative humidity 65-85% without added catalyst, as oligoether simultaneously performs the function of the catalyst retinoblastoma. The obtained varnish when applied it on the protected (treated) surface is here (tree, concrete, metal) has a duration of drying at 18-22°With no more than 30 minutes (from dust) and not more than 24 hours (hard dry).

As the polyisocyanate component lacquer according to the invention contains various polyisocyanates, such as 2,4,-2,6-toluylenediisocyanate, diphenylmethanediisocyanate, hexamethylenediisocyanate, polyisocyanurate.

In the preparation of the varnish according to the invention is prepared solution oligoether in toluene, for example 50% concentration solution of MDI in toluene, for example 50% concentration.

Concentration of solutions oligoether in toluene and a solution of MDI in toluene is determined mainly by the method of coating, type of substrate.

The table below presents examples of lacquer according to the invention and its main properties.

Table
Name of the component propertiesThe ratio of components in examples 1, 2, 3
123
1. The solution oligoether in toluene (50% concentration)   
- oligoether with an acid number of 5 mg KOH/g, a hydroxyl number of 130 mg KOH/g, a viscosity of 8000 MPa·with (on the basis of 80 wt.% tall oil and 20 wt.% triethanolamine): 4,5--
- oligoether with an acid number of 3 mg KOH/g, pyroxyline number 138 mg KOH/g and a viscosity of 10,000 MPa· (the product of the interaction of 70 wt.% tall oil and 30 wt.% triethanolamine);-5,0-
- oligoether with an acid number of 5 mg KOH/g, a hydroxyl number of 125 mg KOH/g, a viscosity of 6000 MPa·with, with the addition of polydimethylsiloxane PMS-200 in the amount of 0.25 wt.% per oligoether--10,0
2. The solution toluylene diisocyanate in toluene (50% concentration)4,55,010,0
Properties of Lac:   
The drying time,   
- from the dust (min)202530
complete drying (up to degree 3, 18-22°C and humidity of 80%), h242424
Hardness0,70,80,8
Water absorption after 24 h, kg/m20,0180,010,008
(water resistant)   
elasticity, mm (WD-1)111
the adhesion scores (metal, wood)111
the lightfastness, 24 hourpermanentpermanentpermanent
resistance to NaCl, h363052
weather resistance, h120100130
wear resistance (abrasion),mm2/cm20,60,50,4

Thus, as can be seen from the table, obtained according to the invention the lacquer provides reception of lacquer coatings on various surfaces with increased resistance, hardness, water resistance and corrosion resistance, and will also work on simple technologies that do not require sophisticated equipment.

1. Odnoupakovochnye lacquer composition for coating comprising a solution in toluene of hydroxyl-containing component and solution in toluene MDI, characterized in that as the hydroxyl-containing component contains oligoether - product interaction in the melt at 170-200°tall oil and triethanolamine with a viscosity of not more than 10000 MPa·C, acid value not more than 5.0 mg KOH/g and g is drexeline number not exceeding 125-138 mg KOH/g, the ratio of oligoether and MDI is 1:1.

2. Odnoupakovochnye lacquer composition for coating according to claim 1, characterized in that oligoether contains components in the following ratio, wt.%: tall oil 70-80, triethanolamine 20-30.

3. Odnoupakovochnye lacquer composition for coating according to claims 1 and 2, characterized in that oligoether further comprises a polydimethylsiloxane (PMS-200) in an amount of 0.02-0.03 wt.% per oligoether entered in ready oligoether or at the stage of its receipt.



 

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