CA2390656A1 - Cleaning composition - Google Patents

Abstract

The invention concerns a cleaning composition for eliminating at room temperature polysulphide sealant, tars, fuel oils and other fatty grime and/or grime adhering to hard surfaces made of metal, glass or to textiles. Said composition comprises at least a mixture of polyarylalkanes, at least an oxygenated organic solvent selected among alkylene glycol ethers, dialkylene glycol monoethers, trialkylene glycol monoethers, alkylene glycol diethers, dialkylene glycol diethers, diacetone alcohol, 2-methyl-2,4-pentanediol and an aliphatic hydrocarbon or a mixture of aliphatic hydrocarbons.

Description

CLEANING COMPOSITION
The present invention relates to a cleaning composition usable in particular for removing sealants at room temperature polysulphides, tars, fuels and other fatty soils or adherent to hard metal surfaces, ceramics, glass, plastics, printed circuits or textiles.
Traditionally, these surfaces have been cleaned using chlorinated solvents such as methylene chloride, 1,1,1-trichloroethane or 1,1,2-trichloro-1,2,2-trifluoroethane but these solvents have been condemned by the Montreal Protocol because of their impact on the ozone layer or because of their toxicity.
To replace these chlorinated solvents, esters such as than alkyl lactates. These products have the disadvantage of being smelly and corrode the surfaces to be cleaned. To remove sealants polysulfides (Thiokol) of glass or metallic surfaces, it is proposed in US patent 5,561,215 a composition comprising at least 50% in weight of pyrrolidones and very particularly of N-methyl-2-pyrrolidone.
These pyrrolidonic solvents have the disadvantage of being hygroscopic, which is unacceptable when cleaning times are high, because the presence of water leads to a reduction in the effectiveness of said solvents. They are also smelly.
In addition, these pyrrolidonic solvents are suspected of being carcinogenic.
Also, compositions based on pyrrolidonic solvents have a stripping effect and therefore their use is prohibitive in certain types of applications of the present invention because they attack the paint coating.
Applicant has now found a cleaning composition multipurpose consisting of solvents without the disadvantages previously described and allowing to remove effectively at temperature ambient polysulfide mastics, tars, fuels and others Oily or adherent soiling of hard metallic surfaces, ceramics, glass, plastics, printed circuits or textiles.

2 The subject of the present invention is therefore a composition of cleaning characterized in that it comprises of 20% to 50% by weight and preferably 30% to 50% by weight of at least minus a mixture of polyarylalkanes;
B 20% to 40% by weight and preferably 25% to 35% by weight of at least minus an oxygenated organic solvent chosen from monoethers alkylene glycols, monoethers of dialkylene glycols, monoethers of trialkylene glycols, diethers of alkylene glycols, dialkylene glycol diethers, diacetone alcohol, 2-methyl-2,4-pentanediol; and C 20% to 40% by weight and preferably 25% to 35% by weight of minus an aliphatic hydrocarbon or a mixture of hydrocarbons aliphatic;
A + B + C representing 100% by weight.
According to the present invention, the mixture of polyarylalkanes is a mixture which comprises products of formula (A) ct + 3 ~ h ~ c ~ ~~ s o ~~ zo ~~~: "zo nZ
n1 in which n1 and n2 = 0 or 1 and which contains products (A) such as n1 +
n2 = 0 and products (A) such as n1 + n2 = 1.
The mixture of polyarylalkanes may contain product (A) to 2 nuclei, (methylbenzyl) xylene, and of product (A) with 3 nuclei which are denotes by bis (methylbenzyl) xylene. This product (A) with 3 cores can be product such as n1 = 1 and n2 = 0, product such as n1 = 0 and n2 = 1 or a mixture of these last two. The polyarylalkane mixture may also contain products such as n1 = 1 and n2 = 1.
As an illustration of such a mixture usable according to the present invention, mention will be made of the mixture of polyarylalkanes sold by the company ELF
ATOCHEM SA under the designation JARISOL XX having a content weight by mono and bis (methylbenzyl) xylenes greater than 99%.
The mixture of polyarylalkanes comprising products of formula (A) can be obtained by condensation of (methyl benzyl) chloride with WO 01/34755 CA 02390656 2002-05-08 pCT / FR00 / 03091

3 with xylene in the presence of a Friedel and Crafts catalyst according to a process described in patent EP 0299867 B1.
According to the present invention, the monoethers of the alkylene glycols are notably - C4-CzS propylene glycol monoethers, such as ether propylene glycol (PM) monomethyl, monoethyl ether of propylene glycol (PE), the mono-n-propyl ether of propylene glycol (PNP), mono-tert.-butyl ether of propylene glycol (PTB), ether mono-n-butyl propylene glycol (PNB) and mono- ether propylene glycol hexyl;
- monoethers of ethylene glycol at C3-Cz5, such as ether ethylene glycol hexyl, ethylene glycol octyl ether and ethylene glycol phenyl ether.
The monoeths of dialkylene glycols are, for example, ether.
dipropylene glycol monomethyl (DPM), mono-n-propyl ether dipropylene glycol (DPNP), the mono-tert.-butyl ether of dipropylene glycol (DPTB), dipropylene glycol mono-n-butyl ether (DPNB), and ether dipropylene glycol monohexyl, diethylene glycol n-butyl ether (Butyl Diglycol Ether - BDG), the hexyl ether of diethylene glycol and ether diethylene glycol octyl.
The monoethers of the trialkylene glycols are, for example, ether monomethyl tripropylene glycol (TPM) and mono-n-butyl ether tripropylene glycol (TPNB).
The diethers of alkylene glycols are in particular - C5-Czs propylene glycol diethers, such as dimethyl ether of propylene glycol ; benzyl methyl ether of propylene glycol; the buyl propylene glycol methyl ether and propylene glycol dibutyl ether;
- C4-C25 ethylene glycol diethers, such as diethyl ether ethylene glycol and dibutyl ether of ethylene glycol.
The dialkylene glycol diethers are, for example, ether dipropylene glycol dimethyl, butyl methyl ether of dipropylene glycol and the dibutyl ether of dipropylene glycol.
Among these compounds, use will preferably be made of the monoethers of propylene glycol such as in particular the mono-n-butyl ether of propylene glycol (PNB), propylene glycol mono-tert-butyl ether (PTB) and monoethers of diakylene glycols such as mono-n-butyl ether of dipropylene glycol (DPNB).

4 According to the present invention, aliphatic hydrocarbons or mixtures of aliphatic hydrocarbons can be hydrocarbons branched linear, cyclic or combinations thereof which may contain from 6 to 24 carbon atoms, preferably 8 to 24 carbon atoms. As examples of these aliphatic hydrocarbons, there may be mentioned alkanes, such as hexane, octane, decane, dodecane, hexadecane, oils mineral, paraffinic oils, decahydronaphthalene, bicyclohexane, cyclohexane, and olefins such as 1-decene, 1-dodecene, octadecene and hexadecene. Examples of mixing commercially available aliphatic hydrocarbons are - NORPART "" 12, 13 and 15 (normal paraffinic solvents available from the company "EXXON CORPORATION");
- ISOPART "" G, H, K, L, M, V (isoparaffinic solvents available after the Company "EXXON CORPORATION");
- SHELLSOLT "" solvents (available from the company "SHELL
CHEMICAL COMPANY ");
- PETROSOLVT "" from CEPSA D-15/20, D-19/22, D-20/26, D-24/27, D-28/31 (cuts of flavored n-paraffins available from "CEPSA");
- EXXSOLT "" hydrocarbon solvents marketed by the Company "EXXON CORPORATION", - ISANET "" hydrocarbon solvents marketed by the Company TOTAL.
According to the present invention, it is preferred to use cups petroleum jars or flavored n-paraffin fractions having an interval of distillation ranging from 150 ° C to 310 ° C and preferably ranging from 185 ° C to 275 ° C.
By flavored cuts, we currently designate cuts which do not contain single-core aromatics such as toluene and benzene.
We will particularly use PETROSOLVT "" from "CEPSA" and in particular cut D-24/27 having a distillation interval ranging from 240 ° C to 270 ° C and the D-20/26 cut having an interval of distillation going from 185 ° C to 265 ° C.
The composition according to the invention can also contain at least one perfume.

WO 01/3475

5 PCT / FR00 / 03091 The composition of the present invention can be applied to surfaces to be cleaned using a brush, cloth, spray, soaked. Optionally, ultrasonic equipment can be used.
The composition according to the invention has the advantage of being versatile. It makes it possible to remove quickly, at temperature ambient, different types of soiling such as mastics, fuels, tars and, in general, all greasy dirt adhering to substrates very diverse (glass, metal surfaces ...).
The following examples illustrate the invention.
EXAMPLES
CLEANING OF POLYSULFIDE MASTICS
Products used Sealants - PR 1776;
- PR 1436 G (NA), hereinafter PR 1436;
- PR 1422 Class B (NA), hereinafter PR 1422.
These sealants, marketed by the company "Le Joint Français" are are in the form of two components, one of the components is base of liquid polysulphide resin, the other component consists of a hardener.
By mixing the two components at room temperature, the liquid resin polysulfide polymerizes more or less slowly to conduct putty.
Solvents - Mixture of mono- and bis (methylbenzyl) xylenes marketed by Company ELF ATOCHEM SA under the designation JARYSOL XX, above after XX. This mixture comprises approximately 85% by weight of (methylbenzyl) xylenes and about 15% by weight of bis (methylbenzyl) xylenes.
- The mono-n-butyl ether of propylene glycol, (hereinafter PNB), - 2-methyl-2,4-pentanediol, hereinafter HG, - CEPSA D24 / 27 petroleum cup, hereinafter 24! 27 which is a mixture of flavored n-paraffins having a distillation range ranging from 240 ° C to 270 ° C.
Cleaning protocol - Cloth test The sealants are applied to aluminum plates of dimensions 40 mm x 20 mm previously cleaned and degreased with ethanol at boiling point. The cleaning compositions according to the present

6 invention obtained by simple cold mixing of the constituents are tested at room temperature with a cloth on sealants after time of polymerization designated in Table 1 by TP of 1 hour, 2 hours and 20 hours.
All sealants used are fully cured (polymerized) after 20 hours and not fully cured after 1 and 2 hours.
The results are reported in Table 1.
The evaluation is only visual and a score is given between 1, 2or3:
1: means: no action of the cleaning composition, 2: means: partial cleaning, 3: means: the surface is completely cleaned.
In Table 1, we have also reported the results of cleaning obtained with butyl lactate (LB), solvent used in the art prior, the solvents taken separately, used in the compositions of cleaning according to the invention and a binary mixture XX / HG.
In this table 1, the percentage of the constituents in the compositions is a percentage by weight. NC means not in accordance with the invention.

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Cleaning of dirt with enriched raw fuel The enriched crude fuel is a mixture of heavy fuel enriched by 20% in weight of Fontainebleau sand and 20% by weight of carbon black.
Solvents used - GNP
- HG

CEPSA D20126 petroleum cup, hereinafter 20/26, which is a mixture of flavored n-paraffins having an interval of distillation ranging from 185 ° C to 265 ° C.
Cleaning protocol A 40 mm x 20 mm stainless steel plate is degreased with methylene chloride or 1,1-dichloro-1-fluoroethane (141 b), then it is weighs.
The plate is then coated by coating it with a flexible plastic spatula of about 1 g accurately weighed with fuel enriched.
In a high form beaker with a useful volume equal to 50 ml, fitted with a magnetic bar, 50 g of the cleaning composition are introduced to test, then introduce the stainless steel plate coated with enriched fuel, stirred at 400 rpm, then there are 1, 5, 10, 15, 20 and 25 minutes weight loss of the drained plate.
The weighing operation takes 20 seconds.
The results are reported in Table 2. In this Table 2, the efficiency E expressed in% is calculated after each reading (weighing) according to formula (I) m1 - m2 E = x 100 (I) m1 - m0 in which m0 is the weight in grams of the clean plate (freshly cleaned), m1 is the weight in grams of the plate coated with the enriched fuel, m2 is the erg grams weight of the plate at time t.
Efficiency corresponds to the amount of dirt removed.

Negative numbers mean that dirt retains solvent (solvent retention), resulting in m2> m1.
In Table 2, we have also reported the results of cleaning obtained with the solvents taken separately used in the composition according to the invention and with non-binary compositions according to the invention.
In Table 2, the percentage of the constituents in the compositions is a percentage by weight. NC means not in accordance with the invention.
EFFICIENCY
E
(IN
%) AT
TIME
t IN
MINUTES) EMPS t IN MINUTES

SoLVANrs 1 5 10 15 20 25 OR COMPOSITIONS

XX (NC) -9.18 1.67 12.40 25.65 35.60 50.28 GNP (NC) -11 -13 -14.6 -14.3 -10 -4.9 24127 (NC -18 -19 -17.8 -17.3 -15.5 -12.3 XX: 50%

24/27: 50% g 12 32 50 61 69 (NC) XX: 50%

GNP: 50% -4.56 25.15 48.64 71.23 83 89 (NC) XX: 40 GNP: 40% -5.65 27.17 58.14 82.66 92.43 94.16 24127: 20 XX: 40 GNP: 40% 0.26 25.88 57.56 82.60 91.37 94 20126: 20 XX: 35%

GNP: 35% -3.41 25.54 54.90 79.63 87.83 93 24127: 30%

BITUMEN CLEANING
The bitumen used is a bitumen 300 which is the end of the distillation of the crude oil and corresponds to mixtures of saturated hydrocarbons and saturated with high molecular weight.
Products used - GNP

Cleaning protocol Degrease a 40 mm x 20 mm stainless steel plate with CHZCIZ
or 141 b and then weigh it.
Bitumen 300 is placed in an oven at 110 ° C. and the plate for 30 minutes before coating the plate.
The bitumen plate 300 is coated by soaking and left drain 48 hours in the open air under a fume cupboard.
In a high form beaker with a useful volume equal to 50 ml provided with a magnetic bar, 50 g of the cleaning composition are introduced to test, then introduce the stainless steel plate coated with bitumen 300, stir at 400 rpm then we note at 1, 5, 10, 15, 20, 25 and 30 min the weight loss of the plaque.
The results are reported in Table 3.
In this table 3, the efficiency E, expressed in% is determined after each weighing according to formula (I) given above.
The percentage of the constituents in the composition is a weight percentage. NC means not in accordance with the invention.
EFFICIENCY
E (FR
%) AT
TIME
t (FR
MINUTES) MPS t IN MINUTES

OR COMPOSITIONS

XX (NC) -45 -58.5 -15 -13.7 9.6 12.9 22.4 GNP (NC) -19.85 -11.2 8 44.5 54.8 64 66.5 24/27 (NC) -8.7 13 43.6 69.8 78 80 89 XX: 35%

GNP: 35% -7.6 17.5 38.5 61.2 76.25 82 92.2 24127: 30

Claims (14)

1. Cleaning composition characterized in that it comprises:
From 20% to 50% by weight of at least one mixture of polyarylalkanes;
B 20% to 40% by weight of at least one organic organic solvent oxygenated chosen from monoethers of alkylene glycols, dialkylene glycol monoethers, trialkylene monoethers glycols, diethers of alkylene glycols, diethers of dialkylene glycols, diacetone alcohol, 2-methyl-2,4-pentanediol; and C 20% to 40% by weight of at least one aliphatic hydrocarbon or a mixture of aliphatic hydrocarbons;
A+B+C representing 100% by weight. 2. Composition according to claim 1, characterized in that:
A represents 30% to 50% by weight, B represents 25% to 35% by weight, C represents 25% to 35% by weight, A+B+C representing 100% by weight. 3. Composition according to one of claims 1 and 2, characterized in that that the mixture of polyarylalkanes is a mixture which comprises products of formula (A):

in which n1 and n2 = 0 or 1 and which contains products A such that n1 + n2 = 0 and products A such that n1 + n2 = 1. 4. Composition according to claim 3, characterized in that the mixture of polyarylalkanes is a mixture having a content weight of mono- and bis(methylbenzyl)xylenes greater than 99%. 5. Composition according to one of claims 1 and 2, characterized in that that component B is a monoether of an alkylene glycol. 6. Composition according to claim 5, characterized in that the monoether of an alkylene glycol is the mono-n-butyl ether of propylene glycol (PNB) or propylene mono-tert-butyl ether glycol (PTB). 7. Composition according to one of claims 1 and 2, characterized in that that compound B is a monoether of a dialkylene glycol. 8. Composition according to claim 7, characterized in that the monoether of a dialkylene glycol is the mono-n-butyl ether of the dipopylene glycol (DPNB). 9. Composition according to one of claims 1 and 2, characterized in that that component B is 2-methyl-2,4-pentanediol. 10. Composition according to one of claims 1 and 2, characterized in that that component C is a mixture of aliphatic hydrocarbons. 11. Composition according to claim 10, characterized in that the mixture of aliphatic hydrocarbons is a cut of n-paraffins dearomatized having a distillation range from 150°C to 310°C. 12. Composition according to claim 11, characterized in that the cut of dearomatized n-paraffins has a distillation range of 240°C to 270°C. 13. Composition according to claim 11, characterized in that the cut of dearomatized n-paraffins has a distillation range of 185°C to 265°C. 14. Application of a composition according to one of claims 1 to 13 for removing polysulphide sealants, tars or fuels from hard surfaces of metal, ceramics, glass, materials printed circuit plastics, textiles.