CN100396388C

CN100396388C - Cleaning method for pre-processing

Info

Publication number: CN100396388C
Application number: CNB2004100919578A
Authority: CN
Inventors: 杨乐树
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2004-12-27
Filing date: 2004-12-27
Publication date: 2008-06-25
Anticipated expiration: 2024-12-27
Also published as: CN1796003A

Abstract

The present invention relates to a cleaning method for pre-processing, which is suitable for cleaning operation of automotive parts (plastic parts) before painted. The cleaning method has the following process steps: predegreasing, degreasing, water washing once, water washing twice, water washing thrice (deionized water), high-pressure blast blowing, circulation hot blast drying and cooling. The cleaning method can remove all foreign matter except objects formed into painted parts and provides a good base which is suitable for the requirement of painting.

Description

A kind of pre-treatment cleaning method

[technical field]

The present invention relates to a kind of pre-treatment cleaning method, especially a kind of on automobile for before the parts of working of plastics carry out coating process, means by a series of chemistry or physics, removal is coated with part and is constituted all foreign matters outside the thing, and the pre-treatment cleaning method of the good substrate that is suitable for being coated with reload request is provided.

[background technology]

At present, application is corrosion-resistant and decorate most economical of automobile and effective method, and the quality of application front surface preliminary treatment (claiming pre-treatment) is again the important step that directly influences coating service life and decorative effect.The pretreated purpose of application front surface is to remove all foreign matters that are coated with outside the part formation thing, and the good substrate that is suitable for being coated with reload request is provided, and has good Corrosion Protection and decorate properties to guarantee coating.Adopt same material of paint, and only be the surface treatment difference, its anticorrosion effect can differ several times, and the visible surface preliminary treatment is big to whole coating quality influence.

And for each parts of automobile, its concrete application demand also is not quite similar, thereby at different parts, its pre-treatment cleaning way of taking also is different.

For bumper, though also be, improve coating, thereby improve the quality of paint coatings for the adhesive force of plastics and the various shortcomings on the minimizing plastic coating by method a series of chemistry or physics.But, because the greasy dirt and the remover (adopting wax, silicone or stearic acid etc. to make remover) of frosting can reduce ADHESION OF PAINTS power and cause the shrinkage cavity of filming greatly.And, because plastics are insulators, being easy to generate static, the absorption dust cleans with surfactant solution, though the effect that dedusting is also arranged and destatic in washing and dry run, also may be stained with dust once more.

For this reason, for bumper, how to design a cover deploying rationally, the cleaning method of science, become the task of top priority.

[summary of the invention]

Technical problem to be solved by this invention provides the pre-treatment cleaning method that a kind of cleaning quality is good, stable, efficient is high.

For solving the problems of the technologies described above, technical scheme of the present invention is:

A kind of pre-treatment cleaning method, be applicable on the automobile and carry out the preceding washing and cleaning operation of application for the parts of working of plastics, may further comprise the steps operation: pre-degreasing, degreasing, once washing, secondary water washing, three washings, high-pressure blasts dry up, circulating air is dried, cool off

Wherein, pre-degreasing and degreasing process adopt alkaline aqueous solution or surfactant solution that workpiece is carried out high-pressure spraying, remove spot, greasy dirt and remover;

Once washing and secondary water washing adopt clear water to carry out high-pressure spraying, remove remaining greasy dirt;

Deionized water is adopted in three washings, and promptly pure water carries out high-pressure spraying, removes by the electrostatic interaction dust adsorbed;

High-pressure blast dries up, and adopts compressed air or high pressure blower and wind Zi, one of the lunar mansions etc. to carry out, and removes the auto parts and components surface globule;

The circulating air oven dry adopts heater to toast, and removes remaining moisture content;

Cooling makes the work-piece cools cooling, and carries out application and prepare.

The present invention has the following advantages:

Adopt this method, optimize, improved cleaning quality effectively, and had advantages of higher stability, meet the requirement of coating process at each step of cleaning.

[description of drawings]

Fig. 1 is the workflow diagram of pre-treatment cleaning method of the present invention.

[specific embodiment]

The present invention is further detailed explanation in conjunction with example with reference to the accompanying drawings:

For the pre-treatment cleaning method, the cleaning principle that it adopts will be described at first:

Be cleaned the greasy dirt on the surface of the work, under physics, chemical action power and the cleaning machine injection water mechanical force of heat energy and washing agent, make its moistening, softening, separation, through liquid flow impact surface of the work produce normal force and tangential force cause schmutzband fragmentation, peel off, come off, cleaning fluid is taken away the dirt particle when workpiece flows, thereby reaches the purpose of cleaning.

This principle is that industry is general, but how to accomplish optimization in deploying, and can maximize the lifting operating efficiency, makes procedure arrangement more scientific and reasonable, then is that a kind of pre-treatment cleaning method of the present invention is wanted disclosed content.See also Fig. 1, the idiographic flow step of this method is:

1. pre-degreasing;

2. degreasing;

3. once washing;

4. secondary water washing;

5. three washings;

6. high-pressure blast dries up;

7. the circulating air roars of laughter are done;

8. cooling.

To describe one by one each step below:

Step 1-2 is a degreasing process, mainly be to rely on chemical method that greasy dirt on the surface of the work and remover are handled, here adopt workpiece is carried out high-pressure spraying alkaline aqueous solution or surfactant solution, make them produce chemical reaction, moistening, softening, separation, take away by the aqueous solution again, can reach the purpose of degreasing.Wherein, the pre-degreasing of step 1 is at greasy dirt that exists on the workpiece and foreign matter, removes the operation that material carried out that some hinder chemical reaction, and duty that is adopted and condition are: expulsion pressure 0.1～0.2MPa, 70～80 ℃ of temperature, hydro-peening 2～4min; Then further to the pre-degreasing operation removed with chemical mode again of the greasy dirt of Ex-all not, duty that is adopted and condition are: expulsion pressure 0.1～0.2MPa, 70～80 ℃ of temperature, hydro-peening 1.5～3min in step 2 degreasing.

Step 3-4 is a rinsing process, mainly is with clear water workpiece to be carried out high-pressure spraying, with the removals such as greasy dirt that remain on the workpiece, adopts washing step here twice, does not have difference in essence, just for more effective, remove greasy dirt more completely.Duty and condition that they adopted are respectively: expulsion pressure 0.1～0.2MPa, normal temperature, hydro-peening 2～3min and expulsion pressure 0.1～0.2MPa, normal temperature, hydro-peening 1～1.5min.

Step 5 is deionization washing operation, mainly be at workpiece in transmittance process because static is adsorbed with the matting that dust is taked again, adopt deionized water (being pure water) to clean, can avoid.Duty that is adopted and condition are: expulsion pressure 0.1～0.2MPa, normal temperature is used atomizer, spraying 0.1～0.3min.

Step 6 dries up operation for high-pressure blast, mainly is to dry up operation at what the globule on the workpiece carried out, because through washing step, to have the more globule on the workpiece, and adopt high-pressure blast to dry up, can remove most of globule faster, for following oven dry is prepared.Duty that is adopted and condition are: normal temperature, 1min.

Step 7 is a baking operation, mainly is to moisture content remaining on the workpiece, adopts heater to make workpiece give birth to temperature rapidly here, impels the surface of the work water evaporates, to reach the purpose of thorough oven dry.Duty that is adopted and condition are: 80 ℃, and 20min.

In addition, because baking operation is consuming time longer,, can takes that here the baking operation branch is done multiplex's section and carry out for avoiding the wait of continuous productive process.

Step 8 is a refrigerating work procedure, mainly is that workpiece is cooled, so that following part is transferred to paint line.Duty that is adopted and condition are: 8min.

The above working time,, all adjustable according to cleaning performance.

Like this, follow this method, can make workpiece remove greasy dirt fully, and workpiece is reached meet the requirement of coating process.Certainly, this method is equally applicable to be the parts of working of plastics on other automobiles that the effect of being reached is identical.

The foregoing description just embodies the preferred version of technical solution of the present invention, those skilled in the art to wherein some part some changes that may make all embodied principle of the present invention, belong within protection scope of the present invention.

Claims

1. pre-treatment cleaning method, be applicable on the automobile and carry out the preceding washing and cleaning operation of application for the parts of working of plastics, it is characterized in that: may further comprise the steps operation: pre-degreasing, degreasing, once washing, secondary water washing, three washings, high-pressure blasts dry up, circulating air is dried, cool off

High-pressure blast dries up and adopts the compressed air high-pressure blast to carry out, and removes the globule;

2. pre-treatment cleaning method as claimed in claim 1 is characterized in that: duty and condition that pre-degreasing is adopted are: expulsion pressure 0.1～0.2MPa, 70～80 ℃ of temperature, hydro-peening 2～4min.

3. pre-treatment cleaning method as claimed in claim 1 is characterized in that: duty that degreasing is adopted and condition are: expulsion pressure 0.1～0.2MPa, 70～80 ℃ of temperature, hydro-peening 1.5～3min.

4. pre-treatment cleaning method as claimed in claim 1 is characterized in that: once washing the duty and the condition that are adopted is: expulsion pressure 0.1～0.2MPa, normal temperature, hydro-peening 2～3min.

5. pre-treatment cleaning method as claimed in claim 1, it is characterized in that: duty that secondary water washing adopted and condition are: expulsion pressure 0.1～0.2MPa, normal temperature, hydro-peening 1～1.5min.

6. pre-treatment cleaning method as claimed in claim 1 is characterized in that: duty and condition that three washings are adopted are: expulsion pressure 0.1～0.2MPa, normal temperature is used atomizer, spraying 0.1～0.3min.

7. pre-treatment cleaning method as claimed in claim 1 is characterized in that: high-pressure blast dries up the duty and the condition that are adopted and is: normal temperature, 1min.

8. pre-treatment cleaning method as claimed in claim 1 is characterized in that: duty and condition that the circulating air oven dry is adopted are: 80 ℃, and 20min.

9. pre-treatment cleaning method as claimed in claim 1 is characterized in that: duty and condition that cooling is adopted are: 8min.