CN101921502B - Paint remover for removing cathodic electrophoretic paint film on surface of steel plate - Google Patents

Abstract

The invention relates to a paint remover for removing a cathodic electrophoretic paint film on the surface of a steel plate. The paint remover comprises the following components in volume ratio: 20-90 parts of amine compound and 10-80 parts of ether compound. The preferable volume ratio of the components of the paint remover is: 80-90 parts of amine compound and 10-20 parts of ether compound. The amine compound is one or two of formamide and N,N'-dimethylformamide; and the ether compound is one or two of butyl cellosolve and ethylene glycol. The two types of compounds are mixed proportionally to obtain the paint remover. During paint removal, the steel plate to be paint-removed is completely soaked in a solution of the paint remover, and the operating temperature range of the paint remover is 30-100 DEG C. The paint remover can meet the requirements of high pain removal speed, no corrosion to substrates, simple preparation, easy operation, convenient use and low toxicity to the human body.

Description

A kind of paint remover of removing the surface of steel plate cathodic electrophoretic paint

Technical field

The present invention relates to a kind of paint remover of removing the surface of steel plate paint film.

Background technology

The existing method that is used for the metal depainting has chemistry to remove, machinery is removed and three kinds of heat abstractions (baked wheaten cakes), because back two kinds of methods are bigger to the base material injury, therefore the most frequently used is chemical process removal paint film.

Paint remover divides organic and inorganic two big types.Chlorinated hydrocarbon solvent type paint remover is an organic type of paint remover of main flow, is the main body solvent with methylene dichloride, trichloromethane, and this type of paint remover depainting time is short, and depainting efficient is high.Like publication number is that the patent of CN1082079A discloses a kind of quick aqueous chemical paint remover, and it is made up of institutes such as formic acid, ethanol, trichloromethane, X 2073, Mono Chloro Acetic Acids, can remove metallic surface paint film and bike priming paint.But the volatility chlorinated hydrocarbon solvent is toxic, and operator and environment are had bigger harm.The relevant report that the environment-friendly type paint remover is also arranged recently; Like publication number is that the patent of CN1775872A discloses a kind of neutral environmental protection paint remover that mainly contains alcohol, phenol, tensio-active agent, paraffin, thickening material; Can be used for removing electronic devices and components surface paint film; But this paint remover needs under hot environment, to work, and can destroy the original form of phosphatize phosphate coat under the electrocoating paint.

The mineral-type paint remover mainly is the paint remover that contains alkaloids such as sodium hydroxide, Pottasium Hydroxide; Also have one type to be to require the paint remover of under strong acid environments such as formic acid, acetate, the vitriol oil, working, with respect to organic paint remover, this type of paint remover is with low cost, and is safe in utilization, pollutes for a short time, can not be detrimental to health.But big to corrosion property usually, when removing electrodeposited paint film, phosphatize phosphate coat is removed in the lump, and the depainting time is long, generally need dozens of hour.

Summary of the invention

The object of the present invention is to provide a kind of paint remover of removing the surface of steel plate cathodic electrophoretic paint, this paint remover can satisfy paint stripping rate fast, ground do not had burn into prepare simple easy handling, easy to use, and little to human toxicity.

The present invention is achieved in that a kind of paint remover of removing the surface of steel plate cathodic electrophoretic paint, and the component of said paint remover by volume proportioning is: 20-90 part aminated compounds, 10-80 part ether compound.

Said paint remover set of dispense ratio is: 80-90 part aminated compounds, 10-20 part ether compound, the proportioning of this component is an optimum ratio.

Said aminated compounds is methane amide, N, a kind of in the dinethylformamide or two kinds.

Said ether compound is a kind of in butyl glycol ether, the ethylene glycol ethyl ether or two kinds.

With above-mentioned two compounds uniform mixing in proportion, promptly make paint remover.When carrying out depainting, will treat that the depainting steel plate is dipped in the said paint remover solution fully, the operating temperature range of paint remover is 30-100 ℃.

The present invention utilizes swelling and the solvency action of solvent to paint film, destroys the space structure of paint film or the bonding force of paint film and steel plate, selects for use the lower solvent of molecular weight as main solvent as far as possible, can rapid permeability to paint film, make paint film soften, expand, remove.According to the similar principle that mixes several kinds of organic solvents are rationally mixed, reach the purpose of Synergistic paint removing.Under the condition of low-temperature heat, steel plate is immersed in the paint remover, thoroughly remove fine and close cathodic electrophoretic paint.

The depainting mode of paint remover mainly contains dissolving and peels off two kinds.Dissolving is to be main with the dissolving paint film, and peeling off is to reduce surface tension, increases the interaction between solvent and the paint film, strengthens the seepage force between paint film and surface of steel plate, makes peeling off from surface of steel plate of paint film full wafer.General preferred to peel off the paint remover that mode is the master, to improve the repeating utilization factor of paint remover.The component of paint remover of the present invention is selected aminated compounds and ether compound for use; Because aminated compounds anticathode electrocoating paint has swelling, solvency action preferably; Ether compound can strengthen the seepage force between paint film and surface of steel plate, to removing cathode electrodip painting synergism is arranged.

Temperature is the important factor that influences paint removing effect.Generally speaking, temperature is too low, and paint stripping rate slowly and not thorough; Temperature is too high, and then ground such as phosphatize phosphate coat form possibly be changed, and by product increases in the paint remover, is unfavorable for the recycling of paint remover.In addition, temperature is also influential to the volatility of paint remover, should select to make paint remover in heat-processed, to form azeotrope to reduce volatile temperature.Therefore, after the above influence factor of paint remover balance of the present invention, selecting suitable depainting temperature is 30-100 ℃.

Paint remover of the present invention can satisfy paint stripping rate fast, ground do not had burn into prepare simple easy handling, easy to use, and little to human toxicity; Can thoroughly remove the surface of steel plate cathodic electrophoretic paint fast, and guarantee that the phosphatize phosphate coat original form is complete, simplify peripheral condition, help to shorten cataphoretic coating Analysis on defects evaluation time, improve the accuracy rate that defect cause is analyzed, effectively control coating quality.

Embodiment

Below in conjunction with specific embodiment the present invention is described further.

Depainting uses part or the lacing film of sample for the different substrate materials that takes off from different depots paint line in following examples, and cathode electrophoresis dope is the product of the BASF commonly used of depot, Dupont-Herberts, NIPPON, PPG four companies.Behind the depainting, under sem, observe alramenting film microscopic appearance.Table 1 is the sample essential information.

Table 1 sample information

Specimen coding	The cathode electrophoresis dope brand	Base material	The electrodeposited paint film outward appearance	Depot
					1#	BASF	Cold-reduced sheet	Normally	A
2#	Dupont-Herberts	Pot galvanize	Defective	B
					3#	NIPPON	Zinc-iron alloy	Defective	C
4#	PPG	Cold-reduced sheet	Normally	D

Embodiment 1:

1, the preparation of paint remover: get N, dinethylformamide (DMF) 90ml, butyl glycol ether 10ml mixes.

2, stripping test: 1#, 2#, 3# sample are placed the flat Erlenmeyer flask that paint remover is housed respectively, install air set pipe additional, in 60 ℃ of heating in water bath after 8 minutes at bottleneck; Paint film begins swelling and breaks away from surface of steel plate; Normal temperature is cooling down, and is with distilled water flushing surface of steel plate residual paint film, air-dry.

Embodiment 2:

1, the preparation of paint remover: get N, dinethylformamide (DMF) 80ml, butyl glycol ether 20ml mixes.

2, stripping test: 1#, 2#, 3# sample are placed the flat Erlenmeyer flask that paint remover is housed respectively, install air set pipe additional, in 60 ℃ of heating in water bath after 10 minutes at bottleneck; Paint film begins swelling and breaks away from surface of steel plate; Normal temperature is cooling down, and is with distilled water flushing surface of steel plate residual paint film, air-dry.

Embodiment 3:

1, the preparation of paint remover: get N, dinethylformamide (DMF) 20ml, butyl glycol ether 80ml mix.

2, stripping test: 1#, 2#, 3# sample are placed the flat Erlenmeyer flask that above-mentioned solution is housed respectively; Install air set pipe additional at bottleneck, after 40 minutes, normal temperature is cooling down in 60 ℃ of heating in water bath; With zero(ppm) water the surface of steel plate residual paint film is rinsed well, air-dry.

Embodiment 4:

1, the preparation of paint remover: get methane amide 10ml, N, dinethylformamide (DMF) 30ml, ethylene glycol ethyl ether 60ml mix.

2, stripping test: 1#, 2#, 3# sample are placed the flat Erlenmeyer flask that above-mentioned solution is housed respectively; Install air set pipe additional at bottleneck, after 40 minutes, normal temperature is cooling down in 60 ℃ of heating in water bath; With zero(ppm) water the surface of steel plate residual paint film is rinsed well, air-dry.

Embodiment 5:

1, the preparation of paint remover: get N, dinethylformamide (DMF) 60ml, methane amide 10ml, ethylene glycol ethyl ether 30ml mix.

2, stripping test: 1#, 2#, 3# sample are placed the flat Erlenmeyer flask that above-mentioned solution is housed respectively; Install air set pipe additional at bottleneck, in 60 ℃ of heating in water bath after 20 minutes paint film break away from surface of steel plate, normal temperature is cooling down; With zero(ppm) water the surface of steel plate residual paint film is rinsed well, air-dry.

The paint removing effect of embodiment 1-5 is seen table 2:

The paint removing effect of table 2 embodiment 1-5

Embodiment 6:

1, the preparation of paint remover: with embodiment 1

2, stripping test: the 4# sample is placed the flat Erlenmeyer flask that above-mentioned solution is housed, install air set pipe additional, respectively at 30 ℃, 60 ℃, 80 ℃, 100 ℃ heating in water bath at bottleneck; After treating the paint film swelling; Normal temperature is cooling down, with zero(ppm) water the surface of steel plate residual paint film is rinsed well, and is air-dry.The paint removing effect of embodiment 5 is seen table 3.

The paint removing effect of table 3 embodiment 6

	30℃	?60℃	?80℃	?100℃
					The depainting time (minute)	15	?6	?8	?8
Paint removing effect	△	?○	?○	?○

Annotate: in table 2, the table 3,

Zero expression depainting is good, and the surface does not have visible paint film vestige

△ representes that depainting is better, and a small amount of paint film of remained on surface is removed after the available flushing with clean water

* expression depainting is bad, and the surface has more paint film residual, can't remove

Claims (2)

1. paint remover of removing the surface of steel plate cathodic electrophoretic paint, it is characterized in that: said paint remover component by volume proportioning is: 80-90 part aminated compounds, 10-20 part ether compound;

Said aminated compounds is methane amide, N, a kind of in the dinethylformamide or two kinds;

Said ether compound is a kind of in butyl glycol ether, the ethylene glycol ethyl ether or two kinds.

2. the paint remover of removal surface of steel plate cathodic electrophoretic paint according to claim 1 is characterized in that: the working temperature of said paint remover is 30-100 ℃.