阅读说明：本技术 具有高附着力的彩涂板预处理工艺 (Coil Coating Products pretreating process with high adhesion force ) 是由 杜蓉 刘星 白会平 谢芬 杨宏武 涂元强 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种具有高附着力的彩涂板预处理工艺；该工艺包括清洗工艺、化学处理工艺、烘烤和冷却工艺,其中,第一次碱洗、第二次碱洗、第一次热水漂洗、第一次复合氧化、第二次复合氧化、第二次热水漂洗和第三次热水漂洗；该工艺适用于目前大型彩色涂层生产线,其生产的产品的T弯性能及时效T弯性能均比普通预处理工艺优良。本发明预处理工艺生产的彩涂板具有优良的附着力性能,产品的T弯性能及时效T弯性能均高于传统预处理工艺,能提高1-2个级别；杯突值得到明显提高,耐划伤性能得到显著提升,划格附着力均达0级,产品的附着力性能得到大幅提升。(The invention discloses a kind of Coil Coating Products pretreating process with high adhesion force；The technique includes cleaning process, chemical treatment technology, baking and cooling technique, wherein first time alkali cleaning, second of alkali cleaning, the rinsing of first time hot water, first time combined oxidation, second of combined oxidation, second of hot water rinsing and the rinsing of third time hot water；The technique is suitable for current large colour coating production line, and the curved performance of T and the curved performance of timeliness T of the product of production are more excellent than common pretreating process.The Coil Coating Products of pretreating process production of the present invention have excellent adhesion performance, and the curved performance of the T of product and the curved performance of timeliness T are above conventional pretreatment technique, can improve 1-2 rank；Erichsen number is improved significantly, and scratch resistant performance is significantly improved, and draws lattice adhesive force up to 0 grade, the adhesion performance of product is increased dramatically.)

1. a kind of Coil Coating Products pretreating process with high adhesion force, the technique include cleaning process, chemical treatment technology, baking And cooling technique, wherein the cleaning process successively includes first time alkali cleaning, second of alkali cleaning, the rinsing of first time hot water, first Secondary combined oxidation, second of combined oxidation, second of hot water rinsing and the rinsing of third time hot water；It is characterized by:

A. cleaning process

During cleaning process, strip successively passes through first time alkaline bath, second of alkaline bath, first time hot water potcher, 7 once-combined oxidation trough, second of combined oxidation slot, second of hot water potcher and third time hot water potcher rinse baths； Wherein, in said washing groove, corresponding technological parameter and control require as shown in the table:

1 cleaning process project of table and corresponding process parameter table

Free alkali Alkali ratio Total alkali Conductivity Temperature First time alkaline bath 3~4.5 points, 10ml ≤1.5 - 8~10ms/cm 50~60 DEG C Second of alkaline bath 2~4 points, 10ml ≤1.5 - 7~9ms/cm 50~60 DEG C First time hot water potcher - - ≤ 10,100ml ≤500ms/cm 50~60 DEG C First time combined oxidation slot 5~8 points, 2ml ≤1.6 - 45~55ms/cm 50~60 DEG C Second of combined oxidation slot 5~8 points, 2ml ≤1.4 - 50~60ms/cm 45~55 DEG C Second of hot water potcher - - < 5,100ml ≤1000μs/cm 40~50 DEG C Third time hot water potcher - - < 1,100ml ≤50μs/cm 40~50 DEG C

Note: "-" indicates that the parameter does not make particular requirement, other indexs in monitoring table when production；

B. chemical treatment technology:

Chemical treatment technology: strip processization painted groove, against painting mode, is passivated processing to strip using two rollers；It is chemically treated Technological parameter is as follows.

Tableization applies process parameter table

Chromium point Conductivity Temperature Change painted groove 15~30,10ml 6.5~7.5ms/cm Room temperature

Tableization applies machine process parameter table

Upper surface Lower surface Application roll roller speed m/min 130~200 130~200 Carrying roller roller speed m/min 65~105 65~105 A/P pressure 200±20 180±20

C. baking and cooling technique

The technique includes that change painting baking and water cooled rolls are cooling, wherein change painting baking temperature is 175~200 DEG C, water cooling temperature≤40 ℃。

2. according to claim 1 with the Coil Coating Products pretreating process of high adhesion force, it is characterised in that: the cleaning process Afterwards, belt steel surface forms one layer of unbodied composition metal oxide layer, and the film of complex oxide film is important to be asked: Co:0.5-2.0mg/ m²。

3. according to claim 1 with the Coil Coating Products pretreating process of high adhesion force, it is characterised in that: the chemical treatment After technique, surface of steel plate forms passivating film, and the film of passivating film is important to be asked: Cr:15-30mg/m²。

4. according to claim 1 with the Coil Coating Products pretreating process of high adhesion force, it is characterised in that: the cleaning process In, cleaning process project, corresponding technological parameter and control require as shown in the table:

Table cleaning process project and corresponding process parameter table

Free alkali Alkali ratio Total alkali Conductivity Temperature First time alkaline bath 3~3.5 points, 10ml ≤1.4 - 8~10ms/cm 55~58 DEG C Second of alkaline bath 2.5~3.5 points, 10ml ≤1.5 - 7~9ms/cm 53~57 DEG C First time hot water potcher - - ≤ 1,100ml ≤100ms/cm 53~56 DEG C First time combined oxidation slot 5~7 points, 2ml ≤1.5 - 50~55ms/cm 50~55 DEG C Second of combined oxidation slot 5~7 points, 2ml ≤1.4 - 55~60ms/cm 50~55 DEG C Second of hot water potcher - - < 1,100ml ≤500μs/cm 43~50 DEG C Third time hot water potcher - - < 0.1,100ml ≤30μs/cm 45~50 DEG C

Note: "-" indicates that the parameter does not make particular requirement, other indexs in monitoring table when production.

5. according to claim 1 with the Coil Coating Products pretreating process of high adhesion force, it is characterised in that: the chemical treatment In technique, chemical treatment technology parameter is as follows.

Tableization applies process parameter table

Chromium point Conductivity Temperature Change painted groove 20~30,10ml 6.5~7.5ms/cm Room temperature

Tableization applies machine process parameter table

Upper surface Lower surface Application roll roller speed m/min 130~180 130~180 Carrying roller roller speed m/min 75~95 75~85 A/P pressure 200±20 180±20

。

Technical field

The present invention relates to the production methods of Coil Coating Products, and in particular to a kind of Coil Coating Products pretreatment work with high adhesion force Skill.

Background technique

Color painted steel strip (abbreviation Coil Coating Products) be using metal strap as substrate (such as cold-reduced sheet, heat zinc coating plate, alclad sheet, Electrolytic galvanized sheet etc.), various high-molecular coatings are coated on its surface or paste product made of upper various plastic films.Coil Coating Products tool Have the advantages that it is corrosion-resistant, shape conveniently, beautiful appearance, compared with traditional rear coating product, have significant technology it is excellent Gesture and cost advantage.Therefore, Coil Coating Products are widely used in the fields such as building, household electrical appliances, auto industry.

The excellent performance of Coil Coating Products depends greatly on the size of colored steel adhesive force.Knot between coating and substrate Resultant force directly affects the coating adhesion of Coil Coating Products, thus the chemical treatment state of substrate surface also directly affect coating with The combination degree of substrate.Improve color coated sheet coating quality, it is necessary to ensure that the quality and performance of film, pretreating process are to guarantee One of key production technology thereof of its quality.

Pretreating process is generally made of cleaning system and chemical processing system, and function is the raw sheet surface to Coil Coating Products It is cleaned and is chemically treated.The main purpose of pretreating process is the grease and impurity for removing belt steel surface, and by being passivated, One layer of chemical composition coating is formed in surface of steel plate, to improve the adhesive force and strip corrosion resistance between coating and strip substrate.

The patent No. (CN 201010590226.3) discloses a kind of production method of color-painted furniture plate, and what is be related to is pre- Treatment process is pre- degreasing → pre- scrub → pre-flush → main degreasing → scrub → 1# hot water injection → 2# hot water injection → surface Adjustment → 3# hot water injection → 4# hot water injection is common pretreating process, is provided in detail to subsequent coating, solidification, cooling Thin technological parameter is not concerned with the high adhesion force of Coil Coating Products to obtain the good color-painted furniture plate of presentation quality.

The patent No. (CN 201110336933.4) discloses a kind of production method of suede color-coating steel plate.What it was related to Pretreating process carries out degreasing alkali cleaning with surface of the cleaning section of color coating unit to steel plate first and desalted water rinses, and completes to steel The surface clean of plate；Then two-sided pretreatment is carried out with preprocessor in painting interval, control steel billet temperature is 90 DEG C, shape after solidification At pretreatment coating, then strip is uniformly cooled down with water cooled rolls.Then rendering is carried out to steel plate, essence applies, adopts after cooling The protrusion of surface of steel plate is polished with withdrawal straightening machine.The invention does not provide high adhesion force Coil Coating Products pretreating process, only with general Logical pretreating process and subsequent coating process, straightening technique are to solve the coil of strip collapse phenomenon that flannelette Coil Coating Products are easily sent out.

To sum up, the common pretreating process of color coating line generally comprises degreasing, rinsing, chemical conversion treatment and does at present A set of continuous technical process such as dry.The pretreating process rarely developed for high adhesion force Coil Coating Products in existing report. Part Coil Coating Products will appear the decline of the adhesive force between coating and substrate with the lengthening of resting period, while may be with paint film The failure conditions such as dusting, blistering, breakage.

Therefore, Coil Coating Products pretreating process of the exploitation with high adhesion force has important meaning for the increased quality of Coil Coating Products Justice.

Summary of the invention

It is an object of the invention to the part Coil Coating Products for overcoming the prior art to obtain as the lengthening of resting period will appear The case where coating adhesion is rapidly deteriorated, affect Coil Coating Products normal use defect (coating adhesion be evaluation Coil Coating Products matter Measure an important technology index of quality), a kind of Coil Coating Products pretreating process with high adhesion force is provided, which is applicable in In current large colour coating production line (yield is 150,000 tons/year or more, 90~150m/min of unit speed), the production of production The curved performance of the T of product and the curved performance of timeliness T are more excellent than common pretreating process.

To achieve the above object, a kind of Coil Coating Products pretreating process with high adhesion force designed by the present invention, the technique Including cleaning process, chemical treatment technology, baking and cooling technique, wherein the cleaning process successively include first time alkali cleaning, Second of alkali cleaning, the rinsing of first time hot water, first time combined oxidation, second of combined oxidation, second of hot water rinsing and third Secondary hot water rinsing；

A. cleaning process

During cleaning process, strip successively passes through first time alkaline bath, second of alkaline bath, the rinsing of first time hot water Slot, first time combined oxidation slot, second of combined oxidation slot, second of hot water potcher and third time hot water potcher 7 are clear Washing trough；Wherein, in said washing groove, corresponding technological parameter and control require as shown in the table:

Table cleaning process project and corresponding process parameter table

	Free alkali	Alkali ratio	Total alkali	Conductivity	Temperature
						First time alkaline bath	3~4.5 points (10ml)	≤1.5	-	8~10ms/cm	50~60 DEG C
Second of alkaline bath	2~4 points (10ml)	≤1.5	-	7~9ms/cm	50~60 DEG C
						First time hot water potcher	-	-	≤10(100ml)	≤500ms/cm	50~60 DEG C
First time combined oxidation slot	5~8 points (2ml)	≤1.6	-	45~55ms/cm	50~60 DEG C
						Second of combined oxidation slot	5~8 points (2ml)	≤1.4	-	50~60ms/cm	45~55 DEG C
Second of hot water potcher	-	-	< 5 (100ml)	≤1000μs/cm	40~50 DEG C
						Third time hot water potcher	-	-	< 1 (100ml)	≤50μs/cm	40~50 DEG C

Note: "-" indicates that the parameter does not make particular requirement, other indexs in monitoring table when production；

B. chemical treatment technology (change apply technique):

Chemical treatment technology: strip processization painted groove, against painting mode, is passivated processing to strip using two rollers；Its chemistry Treatment process parameter is as follows.

Tableization applies process parameter table

	Chromium point	Conductivity	Temperature
				Change painted groove	15~30 (10ml)	6.5~7.5ms/cm	Room temperature

Tableization applies machine process parameter table

C. baking and cooling technique

The technique includes that change painting baking and water cooled rolls are cooling, wherein change painting baking temperature is 175~200 DEG C and (guarantees passivation Film curing performance), water cooling temperature≤40 DEG C (ensure that water cooled rolls cleaning is remained without sludge).

Further, after the cleaning process, belt steel surface forms one layer of unbodied composition metal oxide layer, composite oxygen The film of change film is important to be asked: Co:0.5-2.0mg/m²。

Still further: after the chemical treatment technology, surface of steel plate forms passivating film, and the film of passivating film is important to be asked: Cr:15-30mg/m²。

Still further, cleaning process project, corresponding technological parameter and control are required such as following table institute in the cleaning process Show:

Table cleaning process project and corresponding process parameter table

	Free alkali	Alkali ratio	Total alkali	Conductivity	Temperature
						First time alkaline bath	3~3.5 points (10ml)	≤1.4	-	8~10ms/cm	55~58 DEG C
Second of alkaline bath	2.5~3.5 points (10ml)	≤1.5	-	7~9ms/cm	53~57 DEG C
						First time hot water potcher	-	-	≤1(100ml)	≤100ms/cm	53~56 DEG C
First time combined oxidation slot	5~7 points (2ml)	≤1.5	-	50~55ms/cm	50~55 DEG C
						Second of combined oxidation slot	5~7 points (2ml)	≤1.4	-	55~60ms/cm	50~55 DEG C
Second of hot water potcher	-	-	< 1 (100ml)	≤500μs/cm	43~50 DEG C
						Third time hot water potcher	-	-	< 0.1 (100ml)	≤30μs/cm	45~50 DEG C

Note: "-" indicates that the parameter does not make particular requirement, other indexs in monitoring table when production.

Still further, chemical treatment technology parameter is as follows in the chemical treatment technology:

Tableization applies process parameter table

	Chromium point	Conductivity	Temperature
				Change painted groove	20~30 (10ml)	6.5~7.5ms/cm	Room temperature

Tableization applies machine process parameter table

Beneficial effects of the present invention:

(1) cleaning process in pretreating process of the present invention is innovatively by alkali washing process and the organic knot of composite oxidation technology It closes, assigns the good clean surface of substrate；It is amorphous in one layer of belt steel surface formation and by control combined oxidation section Co content Composition metal oxide layer, improve adhesion while, greatly improve the corrosion resistance and water resistance of coating；

(2) present invention is by changing painting sectionization painting technological parameter, changing painting machine technological parameter and baking, the comprehensive control of cooling section System realizes that passivating film in the abundant solidification of surface of steel plate, applies technique Cr content by controlization and realizes the accurate of passivating film film weight Control, to assign steel plate excellent adhesive force；

(3) Coil Coating Products of pretreating process production have excellent adhesion performance, the curved performance of the T of product through the invention And the curved performance of timeliness T is above conventional pretreatment technique, can improve 1-2 rank；Erichsen number is improved significantly, scratch resistance It can be significantly improved, draw lattice adhesive force up to 0 grade, the adhesion performance of product is increased dramatically.

Detailed description of the invention

Fig. 1 is pretreating process schematic diagram of the present invention.

Specific embodiment

The present invention is described in further detail combined with specific embodiments below, so as to those skilled in the art understand that.

Coil Coating Products pretreating process with high adhesion force of the invention, the technique include cleaning process, chemical treatment work Skill, baking and cooling technique, wherein the cleaning process successively includes first time alkali cleaning, second of alkali cleaning, the drift of first time hot water It washes, first time combined oxidation, second of combined oxidation, second of hot water rinses and the rinsing of third time hot water；It is characterized by:

A. cleaning process

Cleaning process project, corresponding technological parameter and control require as shown in the table:

1 cleaning process project of table and corresponding process parameter table

	Free alkali	Alkali ratio	Total alkali	Conductivity	Temperature
						First time alkaline bath	3~4.5 points (10ml)	≤1.5	-	8~10ms/cm	50~60 DEG C
Second of alkaline bath	2~4 points (10ml)	≤1.5	-	7~9ms/cm	50~60 DEG C
						First time hot water potcher	-	-	≤10(100ml)	≤500ms/cm	50~60 DEG C
First time combined oxidation slot	5~8 points (2ml)	≤1.6	-	45~55ms/cm	50~60 DEG C
						Second of combined oxidation slot	5~8 points (2ml)	≤1.4	-	50~60ms/cm	45~55 DEG C
Second of hot water potcher	-	-	< 5 (100ml)	≤1000μs/cm	40~50 DEG C
						Third time hot water potcher	-	-	< 1 (100ml)	≤50μs/cm	40~50 DEG C

Note: "-" indicates that the parameter does not make particular requirement, other indexs in monitoring table when production；

B. chemical treatment technology (change apply technique):

Chemical treatment technology, against painting mode, is passivated processing to steel plate using two rollers；Its chemical treatment technology parameter is such as Shown in lower.

Table 2, which is changed, applies process parameter table

	Chromium point	Conductivity	Temperature
				Change painted groove	15~30 (10ml)	6.5~7.5ms/cm	Room temperature

Table 3 changes painting machine process parameter table

C. baking and cooling technique

The technique includes that change painting baking and water cooled rolls are cooling, wherein change painting baking temperature is 175~200 DEG C and (guarantees passivation Film curing performance), water cooling temperature≤40 DEG C (ensure that water cooled rolls cleaning is remained without sludge).

According to above-mentioned technique, following practical operations are carried out: