JPS5953693A - Rust preventive painting method of automotive body - Google Patents

Abstract

PURPOSE:To prevent generation of a level difference and to provide a beautiful finish economically in the stage of subjecting the underpart of an automotive body to rust preventive painting by powder electrodeposition, by applying turbulent flow to the draft line position of the automotive body. CONSTITUTION:Plural pieces of spray nozzles are provided near the draft line of an automotive body and circulating flow or a soln. is ejected toward the side face of an automotive body to apply the turbulent flow to the draft position of the body in the dipping stage of the underpart into a powder electrodeposition painting bath and painting said parts. The flow rate of the turbulent flow is maintained at about 3, more preferably >=5m/sec at the contact point with the body. The ratio between the powder/binder during painting in the position receiving the turbulent flow decreases to about 0.5/1-2.8/1, whereby the level difference between the powder electrodeposition coated film and the adjacent electrodeposition coated film is eliminated and the beautifulness of the finish painting is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a strong economical impact on automatic transport systems.
: 1 (Ii Kōnuri Elbow (
Regarding the painting method.

Recently, from the start of the expressway, automatic 11 "nojl:?+
' ? As the IT degree increases to I<'+ In+, the running tj middle white middle Ai (1st-+ 1j11i scatters the sand gravel 1-fir'JR's coating 111.+ loss 11k
(1st I + fi'J chipping phenomenon), I, 11 has one more thing, 1f/1111, and freezing in cold regions in winter.
jd: no/,・me1°['i 111'II otν'(1
・M caused by corrosive antifreeze agents such as stories! ! +u,
II (so-called salt damage) has become a serious problem.

The fenders of the underside of the automobile 1J vehicle body, especially the IJ tunnel body, are subject to the above-mentioned chipping phenomenon and the formation of a corrosive environment such as the occurrence of paint damage due to salt damage, .-'b?II is one of the problems with bangs in the camellia world because of the demand for safety that has been added to the history, etc. .

Countermeasures against auxiliary effects on automobile bodies have been extensively researched.

Powder #VI, powder '111, and paint coatings have been developed for this purpose, and the coating film obtained using these is extremely tough (41) and has a thickness of 1, as described below. It has been recognized that they are extremely effective for the ψr requirement.The method of using these is to apply a chemical conversion lip such as zinc phosphate to the fmit, kit body first by powder coating or by powder coating. After applying the paint to tint and then baking it to crosslink and harden it, apply an ionic 1 to
Electrodeposited with 116 paint and baked it (=I,
There is a method of crosslinking and curing (reverse painting method).

This painting method is 1) ([powder coated surface of stage or
, the mistake in the direction of painting and the latter stage.
4i, ￥I' 1rlt gave rise to the 15.

Determine such four points by 1π)j? J:, ,' Lko°
There is an invention disclosed in Japanese Patent Publication No. 56-2159. According to this invention, first, the highest M resistance is achieved by powder electrodeposition f+is on the 71; 711 Bridge 111] Without converting to y, then +ll'! 'fj This η1 s'1 cleaning method (wet reverse octopus cleaning method) is 4.iN t
; was done. According to this T-treverse cooling method, the powder air in the previous stage; 'i +', l, risugi, ru coating film is not converted to 6, and this (hanokome' + lf)
, 'yj, if'(I'm in an awkward relationship with I N+? Mugi[n's?lt, , Q'i rh 'R
, + mochi r1, so in the reverse painting method ii;l
, 4: 44! - Powder that clearly appears as a thin film (i"f) has a large electrical conductivity because it is a thin film, and on the contrary, it is a thin film.
For this reason, TTt, coating film by coating + tfJ I (coating by coating Il?, : shout, ni〆rt, 7
f 1', -41.

Therefore, with the reverse painting method, the border j, l, and j parts are protected 11'.
:i JJ 'a low-tooth stirring problem is solved.

However, -1-)・11 and 7 wet reverse &: wearing methods can also be seen in the example of the Japanese Patent Publication No. 59-21-59. 11.1. The thickness of the oil film obtained by painting and the removal of sap obtained by the subsequent 'ilf, %'i cold protection. Saha cultivation ＾゛1
This is flh llr! It had the disadvantage of appearing as a step.

In other words, it is unlikely that a step will be created between the powder 71↑ coated film part and the strong field part of S':j, 77:i painting 1・'8 self ().
I couldn't get it. This step is powder lit, coated
'1 Corresponds to the liquid level of the bath. It was found that this level difference was the cause of subsequent damage after painting.

The inventors of the present invention have identified the disadvantages of the finish and aesthetic appearance after 1 coat of painting in the wet reverse painting method. 'h: 819. As a result of my research, I found a clear method for 14 toys...1. Therefore, the present invention + t-1: Special Publication No. 1983
This invention consists in improving the anti-fogging coating method of No. 2159. Therefore, the description of the above-mentioned Special Publication No. 56 2159 '3 is hereby referred to.
11 shall be incorporated. An example is -1- Tokuko Sho 5
6 Powder used in 21fi9; +'ζ coating and anion = l゛l: or ticking property 1; T1
The coatings and their coating methods are also included in the present invention.

Inventor A! F's jilt';/j: by ill,
l', :il! Wurtz I-Reverse painting method, t
5+'+if lbeto's i'j fto11j, Hakurei O'Iro II+, and simply 1. !
i IIi', ltl,! +1 By applying the stirring flow 1 to the water line part of the car body, a step 1.1 f to 'N〆erasing and Jz, f love! It was determined that the performance of the part is 4.[1] per minute of light.

That is, according to the present invention, powder electrodeposition is applied to the surrounding area of the Jr. , Powder 7F (Anti-corrosion paint is applied to the car body, and an agitation flow is applied to the water line part of the automobile body.
h.Learn how to apply fat.

In general, if you use powder, if you apply a coating, then use it! Jj bath rot) 1 bottle/binder (ratio of 1 to 2. f4
/ I, there will be some difference depending on the painting conditions 11'6
Generally speaking, the ratio of powder/Baingu"'l Ili+ in Coating IX that is formed is 213/1 to 4/1,
Paint it;! The ratio of powder to 1 binder tl'+# fat in the bath composition is greater than the ratio of powder in the bath composition. For this reason case) body 'I'4. Apply a thick coating. However, in the present invention, when a +F/4'l' flow is applied to the waterline region at t;11, the powder in the oil film in the region receiving the 4W stirring flow is
It turns out that the ratio of the vines becomes smaller, this ratio is li') I'l' style II Moka, there is a difference depending on the direction (λ, but generally it is 0.5 / 1 to 28 / 1 .

Therefore, the film thickness at the part receiving the 1y11' flow is 1,1
It was found that as the number of 319 decreases, the difference in level from the next 1111 deposition film becomes smaller. This is where the membrane pressure decrease mentioned above occurs, but? 1? It has been found that because powder is present in the chest, the powder's unique 11 (sex seal) is also exhibited.

The JJ method of the present invention will be further explained in detail below.

Powder lightning and coating baths are generally made using a circulation pump to keep the bath liquid composition as uniform as possible, and to replenish the consumed coating amount outside of the city. After taking out the paint and replenishing the paint components, a method is adopted in which the paint is returned to the tank and circulated.For this reason, a bath liquid outlet 1-1 is provided in the direction of the automobile heavy duty outlet of the bath, and a circulating flow is introduced in the direction of the small body inlet. Set up an inlet for bath liquid 71 white (:;;H Honda Te'l:
I L'TIS14Tii)cノ)Tsubayuki If! '
ink (=' J,ru.

= This in lif7? I ['i b: l l Koyori 11
゛71/sec) I/1iii, N1 town is 0.1 Fn/sec-・O, (11-711/sec to 几Iltji quiet/, I
Me+'Iiha 艮, the closing order in the \ direction is l]-.

In such a coating bath, there is
1 Lung bath i song (for rf valley R'/j ll'lj,
R11 Chi Whitell1ll 11f Middle I・1・吃71(:
□P41 Yamakuni (bttLV fl(+4 Nofun Q
・I/ZuruwoH"3' 4s, -L,
#i', I11'i l':j order,;
Shino:, +, + iNn ('+ in the middle of the book 0111
White on the surface, j to I17' (out ~ 1, white lllll111
f The 111 agitation flow should be applied to the hydration area of the midbody. The +η blowing current used in this book'i' is 1υ stirring i'+fE offshore is 3 m at the point of contact with the automatic medium jlj body,, &I is exactly f
45711. It is preferable to set the speed to 1-/, f at every second. If the flow velocity is lower than that of these lines 1'1, it may not be possible to fill the difference in level, which is undesirable.

lif: The luzo of the i injection nozzle is 1・) body 1ti, R? a ”, 'i middle, its stutter) +
71 (with a sufficient number to create a sufficient stirring flow (for example, width of 20 + 1111111 "ri 00 an") over the entire inn. White 1 mountain middle +li body forest middle IJ ni 1 (Ba L
O1l 3 ηL/ Ill(' I/, +1
When you get to the mountain, tll! 'ifi, time 20 seconds,
lj body N 5 nL and +4 = 111') When discharging water in a 1 m bath, 15 to 38 river nozzles are sufficient. Thus, due to the IY/l'l flow 1 formed by the injection nozzle, the cold
It; 'For a minute, Flocyu I/-John and others also entered Boichi Zuro, and circulated the entire anointing liquid]'? In addition to the one that makes it 1, there is a synthetic tree 1111 body with a 71 degree distribution of sheep 5'+'
It is important to prevent the formation of s in the wet parts of the car body, and to prevent the sudden increase in the amount of film from occurring, and to improve the aesthetic appearance of the lungs.
Things will go away.

Examples are shown below. Part and % are iJj :1(nilj
It is standard.

Bath liquid ril! J adjustment method The powder was applied and the coating bath solution was prepared as follows.

Water dispersible cationic t (+1 fat is Epicoat #100
1 (trade name: Epoxy Tree 11i7, Shell Fl 1i
105 parts of jetanolamine and 250 parts of isopropyl alcohol were reacted with reflux F at 80 DEG to 85 DEG C. for 3 hours to obtain a liquid amino epoxy resin.

Also, as a synthetic (?II fat absorber) (J Epicote #1
, 004 (Shell Co., Ltd. 11-ri) 40 copies, 7゛Duct I
l -1+16s (Fueba Publishing, 11) 30 copies,
1'11t'Titanium dioxide R-550 (Ishihara ++i? Industry: 91) 2 +1 iゝ,lt, 1.
rV tr-+I? Ngura'7 MA-10 (1
(E%i chemical formation r1. III) 1 Fil(t・r
i) A main coating ('・1; Tristop f'): 5th grade (from this, Ex I Ruder C melting sub; 〆li!, kneading,
1lii 'IM style powder 1+'1! ! M Te1':＞
I+'/'L A"J T: (11,1B 7μ epoxy tljJ fat as the main component?I-l-l11) body was obtained.

The horn-1-ionic t1"Il1 as bangu
lli' 14: 1 part ice/"II" M 6.2
Part Oyo U De-E Anno Rri (10 hli ≦ addition, dissolver is sufficient for 13 pops, n),'ir'''1)
it fi+'.

280 parts of fine powder is dissolved in 11e dissolver -i', 1
114) Mixing for 1v, min 1i'V, saseri/, f
j h'il II J)> 11i % R-/,,
It was diluted with deionized water until completely dissolved.

4','rllt, of this bath solution has a pH of 5,2PO/J
The lJ ratio was 2.871.

The 1-stone bath in Cation City was installed as follows.

Mix 1 volume of Epicoat #'1004 33 (i it1 (, Ebiko) #1.001 and 140 parts of Ethyl Top + 1 Solve and stir completely. A solution of 20 parts of isopropyl alcohol was added to Jf/amine 1l, jetanolamine 59 +'?l under stirring for 1 hour.
) ((Kept at 1-85°C for 3 hours. Adduct B −
Add 1,065,202 parts of 1C to ethyl cellosolve over 30 minutes with stirring, and add to cJ9 for 1 hour and 30 minutes.
The temperature was maintained at 80-85°0 for 30 minutes to obtain an amine epoxy isocyanate resin.

14. Using the cationic tree 11'1.B. Cζ1 is used as a neutralizing agent using the conventional method for producing paints. ! 1. ! I
T,! : Using titanium oxide and carbon black, I'J (>+'%'
Dilute to 4 degrees and add cation 1'1. ? l! ．． Got a bath. The +1・+r number of the bath solution is pH 5. 4. Ash content 2
5%, degree of neutralization was 75%, and heating residue was 13%.

Example 1 A powder lightning and paint bath was prepared so as to immerse the vehicle from the bottom of the door of an automobile to the top of the 30 mark. The bathing rat was 60 tons. iir1'n line's bath
Set up a circulation pump so that /min) σ? It became l.

Furthermore, in order to create the ↑W agitation flow in the water line section according to the present invention, a separate pump is used to inject the nozzle. J' becomes, bathing all kites 1θ),, 12 songs, ;(11chi white l1i11 +lC
Medium body Iha small 1'il position, automatic medium, tli body i1
contactfrlQpointte5tru/('b 01 j+ir
, i'l! The friend side)~su1;' style was I'1-]. 1"lj ++llG of Nozuha bow 1 and Φ body is 40 (Ii
There is a famous nozzle diameter 2 t: I and bath 0) both 4111
80 pieces in 1 '4'l; lit spaced apart 1ji-1,
Ta. Nozzle 11σ) cure depth (A10+'m).

Coating: l, +4 automatic 1 portrait 1f body is ``Metal phosphoric acid curved lead chemical treatment 1 A was recently prepared, A. (5shi, 150"Cte)l
(1 ull dry frJ+ was 1" -).

From the thousand sides of the door of this car body, 3 fl t・mLf', 1
ζ゛sho p7ji7t'f doru. ), F%lu of the vehicle body
Isr? ! Powder 'iff, ';l'i cold: I)
) After immersing the vehicle in a bath, the car body was washed with lζ:δ4:J and washed with -14, and then subjected to powder treatment.

Powder 'jii1N: The conditions are electric If (4 (10V,
i! II 'll'i, II! rli14 (1 second,
Bath liquid temperature 2 '7' (7, distance between poles bMi, $, 1 [(minimum) 40 cm, 1-1j (ratio is car body outer plate?,,lr
+' (partial quotient) [+1 and N"J 1lliθ) ratio is approximately 1
/1 area.

After pulling the car body out of the bath 1-1 and thoroughly draining it 11;, it was completely submerged in the cationic iR,';r'f@split fabric.
'tl(, し; "? Painted. Air j; Conditions are electric 11',
25 (l V 1ii1jγ1't2 hours (iin
From electric opening 1) to tank exit) 21 ('IT't;,
Bath liquid bath) θ28゛0, lil + interval h'I! raf＜ /
1.2 small) 4! '1 cm, l:! Li ratio is outside 4
1. The number of r1 poles is twice as high in 1ζ months. After taking out the tank f [7 minutes water f11''1 -) then 80 ~ l f)
0 °t: F water L) 1st stem; ・l! ! l! After 1,
9 (20 minutes at 1'C, break "F, A, 1 digit, l temple 1j
ii4 ears ((chukaisaze)ko.

Comparative Example 1 In Example 1, agitation by the nozzle on the wet part of the car body, 1411゜bath), was performed without any flow.
ll! As for x, the lower part of the rlj body was coated by powder electrodeposition under the same conditions as in Example Jet 1.

Actually 1 I [; In Example 1 and Comparative Example 1? 11 car body (, [1 plate according to the usual method)'ν1 (only 1 coat is applied after the intermediate coat,
The test results were summarized as shown in Table 1.

1 Table 1, 'r vinegar applicant Izu! Automatic Drop-off Type Company Mr. Shinto Nuriyoshi Company Times Adachi +1
．． ,.

C3F

Claims (1)

[Claims] 1. Powder II for the lower part of the car body! , O is immersed in the paint bath rL+iI, , the lower part of the car body is powder TIT. When mounting the dock, it is important to apply a circulating flow to the waterline part of the body.
I' modified anti-corrosion coating method for automobile bodies.