JPS62174281A - Composition for peeling of coating film - Google Patents

Abstract

PURPOSE:To obtain the title composition which enables peeling of an unnecessary film adhering to a coated article rapidly and easily with little effort, by incorporating a substance which undergoes volume expansion at temperatures higher than the drying temperature for a coating into a coating. CONSTITUTION:2-70wt% substance which undergoes volume expansion at temperatures higher than the drying temperature for a coating by 20-50 deg.C (e.g., microbaloons of a synthetic resin) is incorporated into a coating consisting of a binder obtained by dissolving a thermoplastic resin in an organic solvent, a thickening agent, a dispersing agent, an antifoaming agent, an anti-settling agent, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hanger for suspending and conveying an object to be painted, a jig for masking, a trolley for placing an object to be painted, or
This invention relates to a paint film stripping composition used to remove unnecessary films adhering to objects to be painted, such as the walls of a paint booth where paint is applied.

[Conventional technology]

;ll: As a method for removing coatings adhering to small objects, (a) A coating film containing a thermoplastic resin that is fixed at room temperature, other thermoplastic resins, and an organic solvent as active ingredients; When the stripping composition is applied to the object to be painted in advance and unnecessary paint adheres to the film in a layer, the surface of the paint film is struck with a hammer or the like to create a gap between the film and the non-painted object. A method of peeling off coatings and coatings from non-coated objects by causing cracks in the coatings and coatings (for example, Japanese Patent Application Laid-open No. 195774/1983) (IJ) Film-forming substances and water absorption When a non-painted object is coated with the A11 composition for removing paint films containing a polymer as an active ingredient, and 11 unwanted moths are deposited on the film in a layer, washing this with water will remove the film. When the water-absorbing polymer contained in the fJl product is brought into contact with water, it adsorbs a large amount of water, and the accompanying volumetric expansion force of several times to several hundred (;'5) is used to lift the paint film. There is a known method (Japanese Unexamined Patent Publication No. 190675/1983) in which the coated surface is then peeled off using a spatula, a pen-J-, a hammer, a lubricant, or the like.

In the case of the former method (a), most of the impact force applied to the paint film surface is transmitted directly to the non-painted object using the paint film as a medium, resulting in the gap cracks due to peeling as described above. There is still the problem that considerable force is required to cause this.

In addition, when using the latter method (b), the contact between the water-absorbing polymer and water that occurs when the paint film peels off is obstructed by the paint film, or when baking at a high temperature (approximately 300°C) The water-absorbing polymer has carbonized,
Peeling (sometimes it does not exhibit water absorption and swelling effect even when immersed in water, and it is also used for water-based paints that contain water in their components, such as water-soluble paints and emulsion paints that can be diluted with water.) There is a problem that the scope of use is greatly limited, as it is impossible to do so.

[Problem that the invention seeks to solve]

The present invention was developed in view of the above-mentioned circumstances, and
The purpose is to make it possible to quickly and easily peel off unnecessary paint films attached to non-painted objects with little effort, and to also expand the range of application.

[Means for solving problems]

A feature of the paint film stripping composition according to the present invention is that it contains as an active ingredient a substance that expands in volume at a temperature higher than the drying temperature of the paint, and its effects and effects are as follows.

[For production]

A non-painted object is coated in advance with a paint film removal composition containing a substance such as a synthetic resin microballoon that expands in volume due to heat and dried to form a film on the surface of the non-painted object. When a layer of paint adheres to the surface of the film during painting work in this state, this film expands by heating it to an expansion temperature that is set higher than the drying temperature of the paint, and the pressure causes the paint to form. can be destroyed from within. Furthermore, at this point, the coating film has been softened by heat, so 2nQ can be destroyed more effectively.

〔Effect of the invention〕

Therefore, when the paint film is separated, there is no need to apply a mechanical impact to the paint film surface, or even if it is applied, the mechanical impact force can be made as small as possible, so that the non-painted object is deformed. Not only can you extend the service life by suppressing damage and damage, but you can quickly and easily remove unnecessary paint films from non-painted objects with little effort. The range of application can be expanded to 11 times.

In addition, after removing the paint film, washing with water and neutralizing waste liquid,
Since there is no need to maintain and manage the processing solution or dry the 1N, it is not only possible to reduce the equipment required for each of these operations, but also to quickly apply the N and 11 compositions for paint film removal. , it has become possible to significantly shorten the reprocessing time for coatings on non-painted objects.

〔Example〕

Examples of the substance that expands in volume at a temperature higher than the drying temperature of the paint, which is an active ingredient in the composition for ■n21k11 according to the present invention, include various synthetic resin microballoons. Use unfoamed material. Depending on the composition, the foaming start temperature and foaming ratio can be freely controlled.

Furthermore, as a binder for forming a film,
Thermoplastic polymer resins are dissolved in aqueous solvents to a suitable viscosity, various emulsions, latex, water-soluble resins, two-component curing resins, thermosetting resins, water-soluble resins, etc. are liquid at room temperature. Most materials can be used as long as they cure in some way and form a film.

In other words, most materials that are commonly used as adhesives or paints can be used.

However, the condition is that it does not contain any components that would destroy the film that forms the synthetic resin microballoon.

The composition of the coating film 'l+1 release material of the present invention is about 2 to 70% by weight, which expands its volume by heat;
The remainder is blended with the above-mentioned binders, solvents, and various additives such as thickeners, dispersants, antifoaming agents, and antisettling agents.

The optimal blending ratio of substances whose volume expands due to heat varies depending on usage conditions such as the shape of the non-painted object, the strength of the paint, and the thickness of the paint film, but in the painting booth where paint is applied, it is 2 to 20% by weight, 15 to 70 parts was optimal for hangers and the like for suspending and transporting objects to be coated.

The above-mentioned one that expands its volume by heat, and
The binder is selected depending on the use and conditions, and a compound is used as a paint stripping composition.

Some paint factories perform alkaline degreasing and zinc phosphate film treatment before painting. Additionally, some painting factories use water-soluble paints or electrodeposition coatings.

In such cases, the material that forms the film should be alkali-resistant,
Painting position 1:1 by selecting acid-resistant materials
Processing, painting, baking and drying can all be done in one line.

Furthermore, devices that heat the walls of painting booths, etc.
By installing a panel heater, etc., when peeling off unnecessary @ materials, you can simply add a heated soup or char and remove the unnecessary materials from the wall with a spatula. It became completely unnecessary.

Next, (1) specific examples of the composition for peeling will be described.

Example-1 Ethylcellulose 8 parts Isopropyl alcohol 9 parts Toluene
43 parts synthetic resin balloon (foaming start temperature 80° C.) 40 parts A mixture of these was applied by dipping onto an iron rod (5ψ×200 mm), left for 20 minutes, and air-dried. In this state, it was immersed in an alkaline degreasing solution and a zinc phosphate coating treatment solution for 10 minutes, but no abnormality was observed. From above, spray 2 liters of cellulose lassocar,
Baking and drying at 60° C. for 30 minutes were repeated several dozen times to form a coating film with a thickness of about 3 cranes. This is 100°
When it was put into a drying oven (C), the paint film stripping composition expanded in about 10 minutes and cracks occurred along the iron rod. After taking it out of the drying oven and leaving it to cool, the unnecessary coating film could be easily separated by hand.

In addition, the same composition was placed on an iron plate (300 x 300 x 0.5
It was applied by spraying on the skin, left to stand for 20 minutes, and air-dried. As a result of leaving this in a booth at an actual installation site for two weeks, the paint was applied to an average thickness of 32+am. In this state, a panel heater was fixed to the back side of this iron plate with a clip, stood vertically, and heated to about 100°C, and the XJI compound for paint film removal expanded in about 5 minutes, removing unnecessary paint. could be easily peeled off by hand. Later, a small amount of foamed synthetic resin balloons remained on the iron plate, but they were gently wiped with a cloth.
It was almost completely restored to its original condition.

Example-2 Polystyrene 15 parts toluene
65 parts synthetic resin balloon (foaming start temperature 80'C) 10 parts synthetic mica
The mixture was applied for 10 minutes to an iron rod (5φ x 200an) by dipping, left for 1 hour, and air-dried. In this state, it was immersed in an alkaline degreasing solution and a zinc phosphate film treatment solution for 10 minutes, but no abnormality was observed. Spray Nitrocellulose lacquer on top and heat at 60°C for 3 hours.
After 0 minutes, the drying process was repeated several dozen times to form a coating film with a thickness of about 3 cranes. When this was put into a drying oven at 100°C, it formed a coating in xi4310 minutes! i,lI
Cracks occurred along the iron rod when using the cutting composition. After taking it out of the drying oven and leaving it to cool, the unnecessary coating film could be easily peeled off by hand. Later, a small amount of foamed synthetic resin balloons remained on the iron rod, but by simply wiping it with a cloth, it was almost completely restored.

In addition, the same composition was placed on an iron plate (300 x 300 x 0.5
It was applied with a brush to the dragonfly, left for 1 hour, and air-dried.

As a result of leaving this in the booth at the actual installation site for two weeks,
The @ material was applied to an average thickness of 32 mm.

In this state, a panel heater was fixed with a clip to the back side of this iron plate, stood vertically, and heated to about 100°C. The paint film stripping composition expanded in about 5 minutes and the unnecessary paint was removed by hand. I was able to peel it off easily. Later, a small amount of foamed synthetic resin balloons remained on the iron plate, but by simply wiping it gently with a cloth, it was almost completely restored.

Example-3 A mixture of 70 parts of EVA emulsion and 30 parts of a synthetic resin balloon (foaming start temperature 80°C) was forged by dipping onto an iron rod (5φ x 200mm), left for 6 hours, and allowed to air dry. Ta. In this state, it was immersed in an alkaline degreasing solution and a zinc phosphate coating treatment solution for 10 minutes, but no 5° seams were observed. On top of that, 21.[1 cellulose lacquer was applied by spray, and the process of baking and drying at 60°C for 30 minutes was repeated several dozen times to form a coating film with a thickness of about 3 rhymes. When this was placed in a drying oven at 100° C., the paint film stripping composition expanded in about 10 minutes and cracks were generated along the iron rod. After taking it out of the drying oven and leaving it to cool, the unnecessary coating film could be easily peeled off by hand. Later, a small amount of the foamed synthetic resin balloon remained on the iron rod, but by simply wiping it gently with a cloth, it was almost completely restored.

Example-4 EVA emulsion 98 parts Synthetic resin balloon (foaming start temperature 80°C) 2 parts T-reethanolamine 0.5 parts The mixture was applied to an iron plate (300 x 300 x 0.5 dragon) with a brush. , and left to stand for 6 hours to air dry. When this was left in a booth at an actual painting site for two weeks, the paint was applied to an average thickness of 32 mm. In this state, fix the panel heater on the back side of this iron plate with a clip and stand it vertically for about 1 minute.
When heated to 00'C, the paint film stripping composition expanded in about 5 minutes, and unnecessary paint could be easily removed with a metal spatula.

Example-5 Ethylcellulose 6 parts Isopropyl alcohol 7 parts 1-luene
17 parts Synthesis 13 (fat balloon (foaming start temperature 80°C) 70 parts of dirt were kneaded together and applied to iron (5φ x 200+n) by kneading, left for 20 minutes, and air-dried. This state After alkaline degreasing, I soaked it in a zinc phosphate film treatment solution for 10 minutes, but no 5rX was detected.

A nitrocellulose lacquer was applied by spraying on top of the lacquer, and the process of baking at 60°C (30 minutes and drying) was repeated several dozen times to form a coating film with a thickness of about 3 cm.

When this was placed in a drying oven at 100°C, approximately 10
Within minutes, the paint stripping composition expanded and cracks appeared along the iron rod. After taking it out of the drying oven and leaving it to cool, the unnecessary coating film could be simply peeled off by hand.

Claims (2)

[Claims] (1) A paint film stripping composition containing as an active ingredient a substance that expands in volume at a temperature higher than the drying temperature of the paint. (2) The expansion temperature of the substance is 20°C higher than the drying temperature of the paint.
The paint film stripping composition according to claim (1), which has a temperature that is ~50°C higher.