JP2000001637A5 - - Google Patents

Description

0002.
[Conventional technology]
When peeling off the old paint film for repainting the outer wall of a conventional building, or when re-laying plastic tiles used for building flooring, etc., a peeling agent for the purpose of shortening the peeling time and saving labor. Has been used. This release agent is mainly a paint release agent containing methylene chloride as a main component and a strong alkali water-soluble paint release agent. However, in recent years, due to heightened environmental awareness, a method of physically peeling without using a paint stripper containing methylene chloride as a main component or an alkaline water-soluble paint stripper has been tried.

A release agent containing methylene chloride as a main component has concerns about environmental impact, work safety, and toxicity, and other chlorine- based organic solvents may also cause environmental problems. The strong alkali water-soluble release agent is based on the oxidative deterioration of the resin due to the alkali metal hydroxide. The stability of the accelerator added in the same manner as described above, the safety of work, and the waste treatment are problems. In addition, many non-chlorine solvent type release agents have been developed to solve this problem, but there is a problem of flammability, and the release inherent in organic solvents to extinguish the flash point or add a water-soluble compound. Most of them add water etc. at the expense of removal performance, and N-methyl-2-pyrrolidone contained in many non-chlorine organic solvent type release agents has an unpleasant amine odor and the presence of basic compounds. Not stable below.

In the case of using these non-chlorine-based solvent type release agent to the outer wall coating or the like, in order to rapidly dissolve the coating surface, the release agent will slide down. In addition, the dissolved coating film is in the same state as the paint before drying, and the overall work efficiency such as the application efficiency of the release agent, reattachment to the work place, and waste treatment of the paint is significantly reduced. For this reason, it is generally only used for applications such as immersing in a release agent in factory work or the like.

0007
[Means for solving problems]
The release agent of the present invention for solving the above problems is characterized in that it first comprises a composition containing the following (a), (b) and (c) and not containing a substantial amount of a chlorinating solvent. It is said.
(A) Ethylene, propylene, butylene glycol ether ester of the formula I of 95-10 w%
O
‖
R ¹ O- (CH _2- CHR ² O) n- ^{CR 3} (I)
(In the above equation, R ¹ is independently a C _{1 to} C ₄ alkyl group and R ² is independently hydrogen, methyl, and ethyl.
R ³ is independently a C _{1 to} C ₄ alkyl group, n is 1 to 4)
(A) 0 to 30 w% of organic protic solvent (c) 5 to 80 w% of water Secondly, the organic protic solvent is an alcohol having 3 to 18 carbon atoms.
Thirdly, it is characterized by containing a basic or acidic compound.
Fourth, the composition described above is thickened to improve coatability and workability.

0009
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail. In the present invention, a composition effective for peeling and removing a coating film such as an outer wall and plastic tiles, which contains the following (a), (b), and (c), and has a substantial amount. A peeling agent and a peeling method which are not chlorinated solvent-free, have good peeling removal efficiency, and are highly safe in all aspects.
(A) Ethylene, propylene, butylene glycol ether ester of the formula I of 95-10 w%
O
‖
R ¹ O- (CH _2- CHR ² O) n- ^{CR 3} (I)
(In the above formula, R ¹ R ² in C ₁ -C ₄ alkyl Le groups independently are independently hydrogen, methyl, ethyl,
R ³ is independently a C _{1 to} C ₄ alkyl group, n is 1 to 4)
(A) 0 to 30 w% organic protonic solvent (c) 5 to 80 w% water And preferably, an effective amount of ethylene, propylene and butylene glycol ether ester is contained, and a non-combustible and an appropriate amount of solvent is easily applied. Therefore, 10% or more of water is added to prepare a water-soluble thickener, for example, a release agent appropriately thickened by using an alkali metal salt or an ammonium salt of a natural polymer derivative or polyacrylate.

In Formula I, R ¹ is an independently C _{1 to} C ₄ alkyl group, R ² is an independent hydrogen, methyl or ethyl, R ³ is an independent C ₁ to C ₄ alkyl group, and n is 1 to 4. It is an individual. The R ^{1 and} R ³ alkyl groups may be branched or unbranched. Examples of this alkyl group are methyl, ethyl, n-propyl, isobropil, n-butyl or isobutyl. Of the propyl and butyl groups, n-propyl and n-butyl are preferable in terms of the balance between permeation and dissolution. The most preferred ethylene, propylene and butylene glycol ether esters of Formula I are those in which ^{R 1} , R ^{2 and} R ^{3 are methyl.}

Remarks 1) The abbreviations in the table have the following meanings. (The same applies to [Table 2])
MDPGAC ... Dipropylene glycol monomethyl ether
Acetate DEG ... Diethylene glycol MDPG ... Dipropylene glycol Monomethyl ether NMP ... N-Methyl-2-pyrrolidone GB ... γ-Butyrolactone 2) When the paint on the test piece becomes soft enough to be peeled off by the scrubber, "○" Is represented by. “X” means that the applied composition of the present invention or the applied comparative solvent is not sufficiently effective, and “Δ” means that it can be removed if left unattended. In addition, the ease of removal of removable items is displayed in 5 stages, and 5 is the best.

Claims (1)

A release agent for a coating film such as an outer wall and a plastic tile, which comprises the following (a), (b), and (c) and does not contain a substantial amount of a chlorinating solvent.
(A) Ethylene, propylene, butylene glycol ether ester of the formula I of 95-10 w%

(In the above formula, R ¹ R ² in C ₁ -C ₄ alkyl Le groups independently are independently hydrogen, methyl, ethyl,
R ³ is independently a C _{1 to} C ₄ alkyl group, n is 1 to 4)
(A) 0 to 30 w% organic protic solvent (c) 5 to 80 w% water