RU2219209C2 - Composite for removing paint and varnish coating - Google Patents

Abstract

FIELD: paint and varnish coatings. SUBSTANCE: invention relates to methods for removing paint and varnish coatings, in part, to washing out composites based on organic solvents. Composite for removing paint and varnish coatings involves the following components, wt.-%: methylene chloride, up to 100; paraffin, 0.3-2.0; acetic acid, 1.0- 2.5; urotropin, 1.0-2.0; ethylcarbitol as a co-solvent, 0-5.0, or vat residue from production of benzyl alcohol, 0-15.0, or their mixture; high-molecular waste from production of A-25 as a thickening agent and evaporation retarding agent, 3.0-15.0. Composite can comprise additionally emulsifier OP-7 or OP-10, 0-1.5 wt.-% or vat residue from production of methylene chloride, 0-5.0 wt.-%. EFFECT: enhanced effectiveness of washing out agent effect, improved technological effectiveness in using. 2 cl, 2 tbl

Description

 The invention relates to the field of chemical methods for removing paint coatings, in particular to compositions of washes based on organic solvents.

 The basis of organic washes, as a rule, are active solvents and cosolvents. In addition, paint remover compositions contain a number of functional additives: evaporation retarders, thickeners, disintegrants, corrosion inhibitors and emulsifiers.

 Known domestic compositions of washes (brands SD and AFT-1) (I.F. Itsko. Removal of coatings. - L .: Chemistry, 1991, p. 47) containing dioxalan 13 as an active solvent. A significant drawback of these washes is their fire hazard, which limits the scope of their application. The same disadvantages are inherent in the composition described in US patent 4732695, (publ. 22.03.88 g), the formulation of which used a mixture of benzyl alcohol and alkylbenzenes.

Closest to the proposed washing formula is the composition according to the patent of the Russian Federation 2041901 (publ. 20.02. 1995), containing methylene chloride as an active solvent, ethanol as a co-solvent, paraffin as a vaporization inhibitor, acetic acid as a disintegrant, and as a corrosion inhibitor urotropine, thickener - aerosil and derivatives of dialkylpolyethylene-glycol ether of phosphoric acid, in the following ratio of components, wt.%:
Ethyl alcohol - 5.6-15.5
Paraffin - 1.0-2.0
Acetic acid - 1.0-1.5
VAT residues of methylene chloride production - 5.0-10.0
Aerosil - 1.0-2.0
Urotropin - 2.0-3.0
Production of dialkylpolyethylene-glycol ether of phosphoric acid - 2.5-3.0
Methylene Chloride - Up to 100.0
The disadvantages of the described composition of the wash are:
- relatively low speed of removal of coatings (on enamel EP-140 18 minutes or more);
- technological difficulties in use due to the use of a solid thickener that is not soluble in the system, which requires special measures to prevent delamination of the suspension and additional operations to remove solid particles of the thickener from the treated surface;
- a relatively high price index and the inaccessibility of a number of ingredients.

 The objective of the invention is to increase the effectiveness of the wash, improve the manufacturability of the application and the use of more affordable and cheap components as functional additives.

This is achieved by the fact that the composition for removing paint coatings based on methylene chloride, including paraffin, acetic acid, urotropin, additionally contains ethyl carbitol or distillation units of benzyl alcohol as co-solvents, and a high molecular weight waste of copolymer A- production, soluble in the system, as a thickening agent and evaporation inhibitor 25 in the following ratio of components, wt.%:
VAT residue production of benzyl alcohol - 0-15,0
Ethyl Carbitol - 0-5.0
High molecular weight production waste of copolymer A-25 - 3.0-15.0
Paraffin - 0.3-2.0
Acetic acid - 1.0-2.5
Urotropin - 1.0-2.0
Methylene Chloride - Up to 100.0
The proposed formulation may also additionally contain OP-7 or OP-10 emulsifiers, which are products of processing a mixture of mono- and dialkylphenols with ethylene oxide (GOST 8433-81), and bottoms from methylene chloride production (TU 6-02-13-07-82 ) in the following ratio of components, wt.%:
VAT production of benzyl alcohol - 3.0-15.0
Ethyl Carbitol - 0-5.0
High molecular weight production waste of copolymer A-25 - 3.0-15.0
Paraffin - 0.3-2.0
Acetic acid - 1.0-2.5
Urotropin - 1.0-2.0
Emulsifier OP-7 or OP-10 - 0-1.5
VAT residues of methylene chloride production - 0-5.0
Methylene Chloride - Up to 100.0
VAT residue production of benzyl alcohol is a homogeneous liquid from yellow to dark brown in the following composition, wt.%:
Dibenzyl ether - 70-80
Benzyl alcohol - Up to 2.0
Benzaldehyde - Up to 0.5
Resinous products - Other
A high molecular weight waste product from the production of A-25 copolymer (vinyl acetate-vinyl chloride copolymer) is a solid polymer deposit from the walls of white or light yellow devices (25% vinyl acetate content).

VAT residue production of methylene chloride (TU 6-02-13-07-82) is a homogeneous liquid from light yellow to brown in the following composition,%:
Chloroform - Up to 3.6
Tetrachloromethane - Up to 40
Trichlorethylene - Up to 2.4
Methylene chloride - N.b. 0.1
The rest (perchlorethylene, pentachloroethane, hexachloroethane) - Up to 100
Ethylcarbitol must comply with TU 6-01-5757583-6-89.

 The manufacturing process of the proposed composition of the wash is as follows.

In a solution of methylene chloride or a mixture of methylene chloride and the bottom residue of the production of methylene chloride with stirring at a temperature of 20-25 ^o C add the bottom residue of the production of benzyl alcohol, ethylcarbitol or a mixture thereof, then gradually dissolve the copolymer A-25, paraffin, urotropin for 5-10 minutes and other components.

 The composition is applied to the surface to be cleaned with a brush or spatula. After loosening, the paintwork is removed with a brush or spatula.

 Table 1 presents the options for the proposed compositions.

 Table 2 presents comparative data on the effectiveness of the proposed and known compositions.

 From the above data it follows that the proposed composition for removing paint coatings is twice as effective as the prototype and contains more affordable and cheaper components as target additives.

 Using as a thickener high molecular weight production waste copolymer A-25, soluble in the system, can significantly vary the viscosity characteristics of the composition, which increases the manufacturability of using the formulation on inclined and vertical surfaces.

Claims (2)

1. The composition for removing paint coatings, including methylene chloride, paraffin, acetic acid, urotropin, characterized in that it additionally contains ethyl carbitol as a co-solvent, or VAT residue from the production of benzyl alcohol, or a mixture thereof, and high molecular weight as a thickening agent and evaporation inhibitor waste production of copolymer A-25 in the following ratio of components, wt.%: VAT residue production of benzyl alcohol 0-15,0 Ethyl Carbitol 0-5.0 High molecular weight production waste of copolymer A-25 3.0-15.0 Paraffin 0.3-2.0 Acetic acid 1.0-2.5 Urotropin 1.0-2.0 Methylene Chloride Up to 100.0 2. The composition according to claim 1, characterized in that, as target additives, it may contain an OP-7 or OP-10 emulsifier and a still residue of methylene chloride production in the following ratio of components, wt.%: VAT residue benzyl alcohol 0-15.0 Ethyl Carbitol 0-5.0 High molecular weight production waste copolymer A-25 3.0-15.0 Paraffin 0.3-2.0 Acetic acid 1.0-2.5 Urotropin 1.0-2.0 Emulsifier OP-7 or OP-10 0-1.5 VAT residue methylene chloride 0-5.0 Methylene Chloride Up to 100.0

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