GB2050867A - Resin coated zinc plated steel plate and container fabricated from same - Google Patents
Resin coated zinc plated steel plate and container fabricated from same Download PDFInfo
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- GB2050867A GB2050867A GB8015153A GB8015153A GB2050867A GB 2050867 A GB2050867 A GB 2050867A GB 8015153 A GB8015153 A GB 8015153A GB 8015153 A GB8015153 A GB 8015153A GB 2050867 A GB2050867 A GB 2050867A
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- steel plate
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- plated steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/58—Epoxy resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2350/00—Pretreatment of the substrate
- B05D2350/20—Chromatation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
Abstract
This invention relates to a resin coated zinc plated steel plate prepared by subjecting a zinc plated steel plate to chromate treatment, coating the treated plate with a composition containing bisphenol A type epoxy resin having an epoxy equivalent of not less then 800 and a curing agent, and baking the resultant plate. This invention further relates to a container fabricated from said resin coated zinc plated steel plate.
Description
SPECIFICATION
Resin coated zinc plated steel plate and container fabricated from the same
Background of the invention
This invention relates to a resin coated zinc plated steel plate suitable for fabricating a container by bonding with a polyamide adhesive, and a container fabricated from the same.
Hertofore, metal containers such as various cans including food cans, 18 liter-cans and the like have been fabricated from tin electroplated steel plate, and the bonding of the body plates of cans has been effected by soldering. However, bonding by soldering has various disadvantages such as rusting due to the presence of flux used for cleaning the part being soldered, reduction of attractiveness due to unprintability of the soldered part, and the toxicity of the fumes of the lead used as a solder ingredient. In order to ovecome these disadvantages, the use of an adhesive has been tried to bond can bodies.
However, in the production of various cans with an adhesive to bond the can bodies, tin electroplated steel plate is not a suitable material because the adhesion properties of the tin plate are generally poor, the cost of the material is high, and the anti-rust property particularly of edge parts is poor. Also, recently, chromed steel plate (tin free steel plate) has been widely used as a material for producing containers bonded by an adhesive since it is cheap and it has satisfactory adhesion properties. However, this plate also has various disadvantages that gloss on a coat-printed surface is poor, that cutting blades are severely damaged by a chromium metal layer, and that rust occurs rapidly in the open air.
We have adopted a zinc plated steel plate as a starting material for producing containers bonded by an adhesive, which is excellent in corrosion-resistance and cheaper than a tin electroplated steel plate, and fully studied the surface treatment and various properties required as a starting material for the above containers, for example adhesion properties, coat-printability, coating appearance, processability, corrosion-resistance and the like. In bonding can bodies by the use of an adhesive, a polyamide type adhesive is usually used, but the bonding strength of the bonded part depends on the properties of a paint coated on the inside and outside of a container. Accordingly, we have fully studied a combination of surface treatment of zinc plated steel plate and a composition of a paint for a container, and accomplished the present invention.
By providing a novel starting material, we have solved various conventional problems with regard to tin electroplated steel plate and tin free steel plate heretofore used as a material for producing containers bonded by the use of an adhesive, and extended the use of zinc plated steel plate.
Summary ofthe invention
This invention provides a resin coated zinc plated steel plate prepared by subjecting a zinc plated steel plate to chromate treatment, coating the treated plate with a composition containing bisphenol A type epoxy resin having an epoxy equivalent of not less than 800 and a curing agent, and baking the resultant plate.
This invention further provides a container fabricated by bonding a resin coated zinc plated steel plate with a polyamide adhesive; said resin coated zinc plated steel plate being prepared by subjecting a zinc plated steel plate to chromate treatment, coating the treated plate with a composition containing bisphenol A type epoxy resin having an epoxy equivalent of not less than 800 and a curing agent, and baking the resultant plate.
Detailed description of the invention
It is well known that the corrosion-resistance of zinc plated steel plate is improved by chromate treatment, and also that the more the amount of chromium adhered, the more effective. Among the properties required for a bonded container, the property that the bonding strength of a bonded part (primary bonding strength and secondary bonding strength) is high is more important than the property that corrosion-resistance is high.We have fully studied the chromate treatment of zinc plated steel plate, and found that a bonded container having a satisfactory bonding strength can be obtained by coating zinc plated steel plate with a chromate film in a total amount of 2 - 40 mg/m2, coating the chromated plate with a paint for the inside and outside of a container (the inside paint is a base coating as a prime coat for metal and the outside paint is a white coat paint and size coat paint as a prime coat for metal), baking the plate thus coated, and bonding the resultant plate by the use of a linear polyamide type adhesive.
According to the present invention, the total chromium amount coated on zinc plated steel plate should preferably be 2 - 40 mg/m2. If the total chromium amount is less than 2 mg/m2, sufficient bonding strength may not be obtained and corrosion-resistance may become poor. On the other hand, if the total chromium amount exceeds 40 mg/m2, bonding strength may be lowered and the surface of zinc plated steel plate become dark. Therefore, the paint coated over the resultant plate loses its gloss and the commercial value of the plate thus obtained is lowered.Furthermore, it is also disadvantageous in respect of the manufacturing cost and workability to coat chromium in such a high amount as in excess of 40 mg/m2. If the total chromium amount coated is in the above mentioned preferable range of this invention, excellent corrosion-resistance, coat-printability, beautiful coating appearance and the like can be achieved in addition to the satisfactory adhesion properties necessary for fabricating containers by bonding. These are unexpected surprising effects.
Zinc plated steel plates used in this invention include a zinc electroplated steel plate, zinc vapor deposited steel plate and galvanized steel plate. The galvanized steel plate may be subjected to non-crystallization treatment or alloying treatment to alloy iron-zinc. However, a regular-spangled zinc plated steel plate is less suitable for this invention since the coated or printed surface does not give a satisfactory color tone because of the presence of the spangle and the smoothness or gloss of the surface is poor.
The paint for the inside and outside of a container used in this invention has a composition containing bisphenol A type epoxy resin having the epoxy equivalent of not less than 800, and a curing agent. The bisphenol Atype epoxy resin can be obtained by the reaction of bisphenol Awith epichlorohydrin in the presence of alkali.Examples of epoxy resins having an epoxy equivalent of not less than 800 include "Epikote (Registered Trade Mark) 1009" (epoxy equivalent = 2400 - 3500), "Epikote 1007" (epoxy equivalent = 1750 - 2150) and "Epikote 1004" (epoxy equivalent = 900 - 1000), all of which are manufactured by Shell
Chemical Co.; "Epomik R 309" (epoxy equivalent = 2400 - 3300) and "Epomik R 307" (epoxy equivalent = 1750 - 2100), both of which are manufactured by Mitsui Petrochemical Co.; "Araldite (Registered Trade Mark)
GY 6099" (epoxy equivalent = 2400 - 3500) and "Araldite GY 6097" (epoxy equivalent = 1750 - 2150), both of which are manufactured by Ciba Geigy A.G.; and "D.E.R. 669 J" (epoxy equivalent = 2400 - 3500) and "D.E.R.
667 J" (epoxy equivalent = 1750 - 2150), both of which are manufactured by Dow Chemical Co. If the epoxy equivalent is less than 800, adhesion properties, coating surface performance and properties, and the appearance of a container fabricated therefrom are not satisfactory.
Examples of the curing agent used in this invention include (i) phenolic resin obtained by reacting formaldehyde with o-cresol and phenol in the presence of an alkaline catalyst; (ii) aromatic or cycloaliphatic polybasic acid and their an hydrides such as trimellitic acid, pyromellitic acid, tetrahydrophthalic acid and the like; (iii) polyesters having a terminal carboxylic acid group obtained by reacting the polybasic acid anhydride as mentioned in the above (ii) with polyhydric alcohol such as hexane diol, trimethylol propane, and the like; and (iv) polyisocyanate and the like.
The above mentioned curing agent is blended with bisphenol A type epoxy resin preferably in a nonvolatile weight ratio of 5/95 - 80/20 (curing agent/epoxy resin).
The composition containing the curing agent and bisphenol A type epoxy resin in this invention can be coated on a steel plate by any of the conventional coating techniques. However, the coating is generally carried out by dissolving the curing agent and the epoxy resin in one or more solvents, coating the resultant solution on a chromated zinc plated steel plate by an ordinary coating method, drying the solvent and baking the resultant plate.Examples of the solvent used as mentioned above include ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone and the like; aromatic hydrocarbons such as benzene, toluene, xylene, and other alkyl benzenes; esters such as methyl cellosolve acetate, ethyl cellosolve acetate, butyl cellosolve acetate, methoxy butyl acetate and the like; alcohols such as diacetone alcohol, butanol and the like; and glycol ethers such as methyl cellosolve, ethyl cellosove, butyl cellosolve and the like. When a curing agent other than phenolic resin is used, it is preferable not to use a solvent having a terminal hydroxyl group in view of the storage stability of the paint. The whole system may be heated when dissolving in a solvent.If desired, in addition to the curing agent and bisphenol A type epoxy resin, the composition may further contain an additive such as pigment, plasticizer, sedimentation stabilizer, leveling agent, defoaming agent, lubricant and the like.
The baking of the paint for a container coated on the chromated zinc plate steel plate is carried out preferably at 150 - 300C for 30 seconds to 30 minutes. These baking conditions can be satisfied by the use of an ordinary baking furnace for coil coating and roll coater used for printing metal in the production of cans.
The thickness of the coating of the composition containing the curing agent and epoxy resin after baking should preferably be 5 - 300 mg/dm2.
Examples of the linear polyamide adhesive used in this invention include nylons such as nylons 6, 6-6, 6-10,6-12,11 and 12; various copolymerized nylons; modified nylon 11 wherein a part of hydrogen in the structure of nylon 11 is substituted by an alkyl group, alkoxy group or the like. However, a polyamide containing as the main component a non-linear dibasic acid component such as dimer acid obtained bythe dimerization of aliphatic acid should not be used. Since the crystallinity of the dimer acid type polyamide is essentialiy low, it is poor in respect of heat-resistance, resistance to hot water and resistance to solvents. The dimer acid type polyamide also has the advantage that an amount extracted by extraction test is large, and therefore this polyamide is not desirable.The above linear polyamide resin additionally containing an appropriate amount of ionomer resin, polyethylene resin or the like is also usable.
The bonding of plates to fabricate a container can be simply carried out by applying a linear polyamide type adhesive in the form of a film between the coated and baked films of the composition containing the curing agent and epoxy resin of this invention on the chromated zinc plated steel plates, and then melting said polyamidetype adhesive art a sufficiently high temperature. For example, when nylon 12 is used as an adhesive, the bonding temperature is 200 - 300"C, preferably 210 - 270"C.
As fully mentioned above, a bonded container prepared with the zinc plated steel plate of this invention as a starting material not only provides a satisfactory bonding strength equivalent to or higher than that of conventional tin electroplated steel plate or tin free steel plate, but also provides excellent corrosionresistance, workability, coat-printability, coat-finish properties and economic advantages.
Specifically, the zinc plated steel plate for a bonded container of this invention can be produced by using the conventional continuous chromate treatment apparatus and continuous coating and baking apparatus for precoat paint unmodified. Accordingly, if the precoated intermediate product is plated on market, it is a very advantageous material for a container in view of the manufacturing cost and productivity in comparison with the conventional material.
The present invention is further illustrated by the following reference examples and working examples.
Reference Example 1
Phenolic resin curing agent was prepared by adding formalin to the mixture of o-cresol/phenol of the weight ratio 7/3 in an amount of 1.1 mole per equivalent of phenolic hydroxyl group and reacting the resultant mixture at 900C for one hour in the presence of an ammonia catalyst. The phenolic resin curing agent thus prepared was blended with bisphenol A type epoxy resin "Epikote 1007" (epoxy equivalent = 1750 - 2150) in a weight ratio of 6/4 (phenolic resin/epoxy resin), and the mixture was dissolved in a mixed solvent comprising equivalent weights of methyl Cellosolve (Registered Trade Mark) buty Cellusolve and xylene to prepare a resin concentration of 30%. This paint is referred to hereinafter as "Paint A".
Reference Example 2
In this Example, the same phenolic resin as used in Reference Example 1 was blended with the same bisphenol A type epoxy resin "Epikote 1007" as used in Reference Example 1 in a weight ratio of 4/6 (phenolic resin/epoxy resin), an the mixture was dissolved in the same manner as in the above reference example to prepare a paint. This paint is referred to hereinafter as "Paint B".
Reference Example 3
2.7 parts by weight of trimellitic anhydride curing agent and 24.3 parts by weight of bisphenol A type epoxy resin "Epikote 1007" (epoxy equivalent = 1750 - 2150) were dissolved in 46 parts by weight of a mixed solvent comprising equivalent weights of methyl cellosolve acetate, Cellosolve acetate and xylene to prepare a resinous solution. 46 parts by weight of rutile type titanium oxide colouring pigment "Tipaque
R580" (manufactured by Ishiwara Sangyo K.K.) was mixed with the above resinous solution. The mixture was then stirred in a high-speed stirrer, and was dispersed in a sand mill dispersion mixer to prepare a white coat paint. This paint is referred to as "Paint C".
Reference Example 4
425 parts by weight of trimellitic anhydride curing agent, 75 parts by weight of pentaerythritol and 500 parts by weight of butyl cellosolve acetate reactive solvent were charged in an esterification reaction apparatus equipped with a cooler and stirrer, and the mixture was then reacted at 1700C for 20 minutes in a nitrogen atmosphere to prepare a white cream-like polyester.This product had an acid value of 492 mg
KOH/g and an average molecular weight of 950. 90 parts by weight of the above prepared polyester containing a terminal carboxyl group (resin concentration = 50 %) and 255 parts by weight of bisphenol A type epoxy resin "Epikote 1009" (epoxy equivalent = 2400 - 3500) were dissolved in 655 parts by weight of mixed solvent comprising equivalent weights of methyl cellosolve acetate, 3-methoxy butyl acetate and xylene to prepare a clear paint having a nonvolatile content of 30%. This paint is referred to hereinafter as "Paint D".
Reference Example 5
66.7 parts by weight of polyisocyanate solution (containing about three NCO groups per molecule) curing agent having a solid content of 75% obtained by adding one mole of trimethylol propane to three moles of 2,4-toluene diisoycanate and dissolving the addition product in acetic acid ester and 150 parts by weight of bisphenol Atype epoxy resin "Epikote 1004" (epoxy equivalent = 900 - 1000) were dissolved in 783.3 parts by weight of the same solvent as used in Reference Example 3 to prepare a clear paint having a nonvolatile content of 20%. This paint is referred to hereinafter as "Paint E".
Reference Example 6
The same procedure as in Reference Example 1 was repeated to prepare a paint, except that bisphenol A type epoxy resin "Epikote 828" (epoxy equivalent = 182 - 194) of Shell Chemical Co. was used in place of "Epikote 1007". The paint thus prepared is referred to as "Paint F".
Reference Example 7
The same procedure as in Reference Example 3 was repeated to prepare a paint, except that bisphenol A type epoxy resin "Epikote 1001" (epoxy equivalent = 450 - 500) of Shell Chemical Co. was used in place of "Epikote 1007". The paint thus prepared is referred to as "Paint G".
Working Examples 1 to 4 and Comparative Examples 1 to 5
Chromium in an amount of 15 mg/m2 was coated on each of a zinc electroplated steel plate, a zinc vapor deposited steel plate, a galvanized steel plate subjected to non-crystallization treatment, a galvanized steel plate subjected to alloying treatment and a spangled galvanized steel plate (each plate having a thickness of 0.4 mm) by chromate treatment to prepare samples used in Working Examples 1 to 4 and Comparative
Example 4. Each of these samples was coated with each of Paints A to C as prepared in Reference Examples 1 to 3. The coated samples were baked at 200"C for 10 minutes in a gas oven. The thickness of the coated film is shown in the following Table 1.Dry nylon 12 type linear polyamide adhesive (adhesive for container, "Cany Bond S 160" manufactured by Toagosei Kagaku Kogyo K.K., coating thickness = 120 U) was then applied between the above prepared sample plates. The plates were then heat-pressed under a pressure of 4 - 5 kg/cm2 at 220"C for 20 seconds to melt the adhesive. Thereafter, the plates were rapidly cooled by a water cooled press. The bonded samples were then allowed to stand overnight. A part of the samples was subjected to a primary bonding strength test to measure an initial T peeling strength by a Schopper tensile tester, and the other part of the samples was subjected to a secondary bonding strength test to measure a T peeling strength in the same manner as above after immersing the samples in hot water at 1 00'C for 24 hours and restoring the temperature of the samples to room temperature.
With regard to Comparative Examples 1,2 and 3, the same procedures were repeated as in Working
Examples 1, 2 and 3, except that the same plates were not subjected to chromate treatment.
With regard to Comparative Example 5, a tin electroplated steel plate having a thickness of 0.22 mm was used as a sample, and was subjected to the same test as above.
The results are shown in the following Table 1.
TABLE 1
Coating appearance
Paint A B C (Reference Ex. No). (1) (2) (3)
Epoxy Resin Epikote Epikote Epikote 1007 1007 1007
Epoxy Equivalent (g/equivalence) 1950 1950 1950
Curring Agent phenolic phenolic trimellitic resin resin anhydride
Coating thickness (mg/dm) 40 40 160
Example No. 8 Chromium Sample Plate
Working Ex.1 15 mg/m Zinc electroplated steel plate 0 0 0
Comparative Ex. 1 0 0 0 0
Working Ex.2 15 Zinc vapor deposited steel 0 0 0
Comparative Ex.2 0 plate 0 0 0
Working Ex.3 15 galvanized stell plate 0 0 0
Comparative Ex.3 0 subjected to non-crystalliza- 0 0 0 tion treatement
Working Ex.4 15 galvanized steel plate # # # subjected to alloying treatement
Comparative Ex.4 15 regular spangled galvanized # # x steel plate
Comparative Ex.5 0 tin electroplated steel plate - 0
Note:Evaluation of Coating Appereance 0 overall attractive # practically good although gloss is a little poor x dark grey. no gloss or surface irregularities of the steel plate - showing up unaltered.
Initial Bonding Strength (Kg/25mm)
Paint A B C (Reference Ex. No.) (1) (2) (3)
Epoxy Resin Epikote Epikote Epikote 1007 1007 1007
Epoxy Equivalent (g/equivalence) 1950 1950 1950
Curring Agent phenolic phenolic trimellitic resin resin anhydride
Coating Thickness (mg/dm) 40 40 160
Example No.
Chromium Sample Plate
Amount
Working Ex.1 15 mg/m Zinc electroplated steel plate 32.0 30.0 41.0
Comparative Ex. 1 0 17.0 17.0 16.0
Working Ex.2 15 Zinc vapor deposited steel 32.3 31.3 39.5
Comparative Ex.2 plate 18.6 18.0 17.4
Working Ex.3 15 galvanized stell plate 33.0 36.5 31.0
Comparative Ex.3 0 subjected to non-crystalliza- 12.0 12.5 17.5 tion treatement
Working Ex.4 15 galvanized steel plate 52.5 50.1 42.4 subjected to allowing treatement
Comparative Ex.4 15 regular spangled galvanized 22.3 16.0 16.3 steel plate
Comparative Ex.5 0 tin electroplated steel plate 3.0 3.2 4.5 Bonding Strength After Immersing in
Hot water (Kg/25mm)
Paint A B C (Reference Ex.No.) (1) (2) (3)
Epoxy Resin Epikote Epikote Epikote 1007 1007 1007
Epoxy Equivalent (g/equivalence) 1950 1950 1950
Curring Agent phenolic phenolic trimellitic resin resin anhydride
Coating Thickness (mg/dm) 40 40 160
Example No. Chromium Sample Plate
Amount
Working Ex.1 15 mg/m Zinc electroplated steel plate 28.5 24.3 11.3
Comparative Ex. 1 0 12.6 7.5 14.7
Working Ex.2 15 Zinc vapor deposited steel 29.2 24.0 20.7
Comparative Ex.2 plate 13.8 12.5 16.1
Working Ex.3 15 galvanized stell plate 23.3 25.5 17.7
Comparative Ex.3 0 subjected to non-crystalliza- 9.5 9.2 5.7 tion treatement
Working Ex.4 15 galvanized steel plate 51.6 43.6 41.5 subjected to allowing treatement
Comparative Ex.4 15 regular spangled galvanized 12.8 43.6 41.5 steel plate
Comparative Ex.5 0 tin electroplated steel plate - - - Working Examples 5 to 7 7 and Comparative Examples 6 to 8
A galvanized steel plate of a thickness of 0.27 mm subjected to non-crystallization treatment was used as a sample, and the total chromium amount adhered by chromate treatment was varied.The bonding and testing procedures were carried out in the same manner as in Working Example 1 to measure an initial bonding strength (T peeling strength). The results are shown in the following Table 2.
TABLE 2
Paint (Reference E.No.) A(1)
Epoxy Resin Epikote 1007
Epoxy Equivalent (g/equivalence) 1950
Curing Agent phenolic resin
Coating Thickness (mg/dm) 40
Example No. Total Chromium Amount Initial Bonding Coating
Strength Appearance (mg/m) Kg/25 mm
Working Ex.5 2.2 25.3 0
Working Ex.6 5.5 50.4 0
Working Ex.7 17.4 40.8 0
Working Ex.8 19.7 29.4 0
Working Ex.9 20.8 28.0 0
Working Ex.10 27.1 24.0 0
Working Ex.11 37.0 26.4 0
Comparative Ex.6 1.2 16.8 0
Comparative Ex.7 41.6 24.0 x
Comparative Ex.8 73.7 3.6 x B (2) C (3)
Epikote 1007 Epikote 1007 1950 1950 phenolic resin trimellitic anhydride 40 160
Example No.Initial Bonding Coating Initial Bonding Coating
Strength Appearance Strength Appearance
Kg/25 mm Kg/25 mm
Working Ex.5 21.7 0 20.5 0
Working Ex.6 29.4 0 40.8 0
Working Ex.7 33.4 0 34.8 0
Working Ex.8 28.8 0 27.0 0
Working Ex.9 28.4 0 24.0 0
Working Ex.10 25.2 0 23.4 0
Working Ex.11 28.2 0 28.8 0
Comparative Ex.6 15.3 0 17.4 0
Comparative Ex.7 21.0 x 14.4 #
Comparative Ex.8 8.4 x 4.8 x Working Examples 12 to 15 and Comparative Examples 9 to 10
A galvanized steel plate of a thickness of 0.27 mm subjected to non-crystallization treatment was chromated in such a manner as to give a total chromium amount of 10 mg/m2 on the surface. The chromated plate was then coated with each of Paints A to G prepared in Reference Examples 1 to 7, and the paint coated plate was baked at a line speed of 50 m/min in a continuous gas furnace.The temperature of the first zone of the gas furnace was maintained at 200"C; the second zone at 270 C; and the third zone at 283 C The total residence time in the furnace was 100 seconds.
Nylon 11 type linear polyamide adhesive (adhesive for container, "Cany Bond S 100" manufactured by
Toagosei Kagaku Kogyo K.K., coating thickness = 10,u) was applied between the above prepared sample plates. The plates were then heated by an induction heating apparatus to melt the adhesive, and at the same time the plates were bonded by bumping with a hammer. The bonding time was about 0.1 second. The bonding strength (T peeling strength) of the samples thus bonded was tested in the same manner as in
Working Example 1. The results are shown in the following Table 3.
TABLE 3
Example No. Paint Epoxy Resin Epoxy Equivalent Curing Agent Coating Initial (Reference (g/equivalance) Appearance Bonding (Ex. No.) Kg/6 mm
Working Ex. 12 A (1) Epikote 1950 phenolic 0 6.2 1007 resin
Working Ex. 13 C (3) Epikote 1950 trimellitic 0 5.7 1007 anhydride
Working Ex. 14 D (4) Epikote 2950 polester 0 5.3 1009 containing terminal carboxyl group
Working Ex.15 E (5) Epikote 950 poly- 0 4.7 1004 isocyanate
Comparative Ex.9 F (6) Epikote 190 phenolic x 0.5 828 resin sticky
Comparative Ex.10 G (7) Epikote 480 trimellitic poor # 0.8 1001 anhydride smootheness
Claims (7)
1. A resin coated zinc plate steel plate prepared by subjecting a zinc plated steel plate to chromate treatment, coating the treated plate with a composition containing bisphenol A type epoxy resin having an epoxy equivalent of not less than 800 and a curing agent, and baking the resultant plate.
2. A resin coated zinc plated steel plate according to Claim 1, wherein the total chromium amount adhered to the plate by chromate treatment is 2 - 40 mg/m2.
3. A resin coated zinc plate steel plate according to Claim 1 or 2, wherein said zinc plate steel plate is a zinc electroplated steel plate, zinc vapor deposited steel plate, galvanized steel plate subjected to non-crystallization treatment or galvanized steel plate subjected to alloying treatment.
4. A container fabricated by bonding a resin coated zinc plated steel plate with a polyamide adhesive; said resin coated zinc plate steel plate being prepared by subjecting a zinc plated steel plate to chromate treatment, coating the treated plate with a composition containing bisphenol A type epoxy resin having an epoxy equivalent of not less than 800 and a curing agent, and baking the resultant plate.
5. A container according to Claim 4, wherein the total chromium amount adhered to the plate by chromate treatment is 2 - 40 mg/m2.
6. A container according to Claim 4 or 5, wherein said zinc plated steel plate is a zinc electroplated steel plate, zinc vapor deposited steel plate, galvanized steel plate subjected to non-crystallization treatment or galvanized plate subjected to alloying treatment.
7. Resin coated steel plate according to claim 1, or a container fabricated from it, substantially as herein described in any one of the examples.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5909879A JPS55152055A (en) | 1979-05-16 | 1979-05-16 | Resin coated zinc plated steel plate and adhering vessel using said resin coated zinc plated steel plate as blank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2050867A true GB2050867A (en) | 1981-01-14 |
| GB2050867B GB2050867B (en) | 1983-08-03 |
Family
ID=13103509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8015153A Expired GB2050867B (en) | 1979-05-16 | 1980-05-07 | Resin coated zinc plated steel plate and container fabricated from same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS55152055A (en) |
| DE (1) | DE3017680C2 (en) |
| GB (1) | GB2050867B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0059136A3 (en) * | 1981-02-23 | 1982-10-06 | Ato Chimie | Process for coating metallic substrates with plastic materials and metal-plastic complexes thus obtained |
| FR2534277A1 (en) * | 1982-10-06 | 1984-04-13 | Maubeuge Fer | PROCESS FOR THE CONTINUOUS PRODUCTION OF A COATED AND OPTIONALLY FORMED METAL STRIP |
| FR2551464A1 (en) * | 1983-08-31 | 1985-03-08 | Nippon Kokan Kk | PROCESS FOR PREPARING A CORROSION-RESISTANT TREATED SURFACE STEEL SHEET |
| EP0230320A1 (en) * | 1986-01-24 | 1987-07-29 | Kawasaki Steel Corporation | Organic coated steel strip having improved bake hardenability and method for making |
| FR2596420A1 (en) * | 1986-03-27 | 1987-10-02 | Nippon Kokan Kk | SURFACE TREATED STEEL SHEET WITH HIGH CORROSION RESISTANCE |
| EP0307996A1 (en) * | 1987-09-04 | 1989-03-22 | Nippon Paint Co., Ltd. | A corrosion preventing coating composition to be applied as a thin layer for steel sheet |
| EP0380024A2 (en) * | 1989-01-23 | 1990-08-01 | Nippon Steel Corporation | Organic composite plated steel sheet highly susceptible to cationic electrodeposition |
| EP1070553A1 (en) * | 1999-07-17 | 2001-01-24 | Dieter Müller | Process for coating hot-dip zinc galvanized iron or steel articles |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6033192B2 (en) * | 1980-12-24 | 1985-08-01 | 日本鋼管株式会社 | Composite coated steel sheet with excellent corrosion resistance, paint adhesion, and paint corrosion resistance |
| JPS59115832A (en) * | 1982-12-23 | 1984-07-04 | 日本鋼管株式会社 | Outer-surface powdered body epoxy resin coated steel pipe having excellent cathode exfoliation resistance and its manufacture |
| JPS60175631U (en) * | 1984-04-27 | 1985-11-21 | 東洋ゴム工業株式会社 | vibration damping structure |
| JPS61213378A (en) * | 1985-03-18 | 1986-09-22 | Marugo Rubber Kogyo Kk | Composite body of metal and rubber having excellent corrosion resistance |
| JPS648033A (en) * | 1986-03-27 | 1989-01-12 | Nippon Kokan Kk | High corrosion resistant surface treated steel plate |
| JP4670248B2 (en) * | 2004-03-26 | 2011-04-13 | パナソニック株式会社 | Cooker using surface-treated steel sheet |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3755018A (en) * | 1971-04-26 | 1973-08-28 | Eltzroth & Ass J M | Composition and process for inhibiting corrosion of non-ferrous metal surfaced articles and providing receptive surface for synthetic resin coating compositions |
| JPS52129787A (en) * | 1976-04-26 | 1977-10-31 | Nippon Kokan Kk <Nkk> | Highly anticorrosive steel sheet |
| JPS5353342A (en) * | 1976-10-26 | 1978-05-15 | Nippon Telegr & Teleph Corp <Ntt> | Optical waveguide formation method |
-
1979
- 1979-05-16 JP JP5909879A patent/JPS55152055A/en active Pending
-
1980
- 1980-05-07 GB GB8015153A patent/GB2050867B/en not_active Expired
- 1980-05-08 DE DE19803017680 patent/DE3017680C2/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0059136A3 (en) * | 1981-02-23 | 1982-10-06 | Ato Chimie | Process for coating metallic substrates with plastic materials and metal-plastic complexes thus obtained |
| FR2534277A1 (en) * | 1982-10-06 | 1984-04-13 | Maubeuge Fer | PROCESS FOR THE CONTINUOUS PRODUCTION OF A COATED AND OPTIONALLY FORMED METAL STRIP |
| EP0107555A1 (en) * | 1982-10-06 | 1984-05-02 | Fabrique De Fer De Maubeuge | Process for the continuous production of a coated and possibly shaped metallic strip |
| FR2551464A1 (en) * | 1983-08-31 | 1985-03-08 | Nippon Kokan Kk | PROCESS FOR PREPARING A CORROSION-RESISTANT TREATED SURFACE STEEL SHEET |
| EP0230320A1 (en) * | 1986-01-24 | 1987-07-29 | Kawasaki Steel Corporation | Organic coated steel strip having improved bake hardenability and method for making |
| FR2596420A1 (en) * | 1986-03-27 | 1987-10-02 | Nippon Kokan Kk | SURFACE TREATED STEEL SHEET WITH HIGH CORROSION RESISTANCE |
| EP0307996A1 (en) * | 1987-09-04 | 1989-03-22 | Nippon Paint Co., Ltd. | A corrosion preventing coating composition to be applied as a thin layer for steel sheet |
| EP0380024A2 (en) * | 1989-01-23 | 1990-08-01 | Nippon Steel Corporation | Organic composite plated steel sheet highly susceptible to cationic electrodeposition |
| EP0380024A3 (en) * | 1989-01-23 | 1991-11-27 | Nippon Steel Corporation | Organic composite plated steel sheet highly susceptible to cationic electrodeposition |
| EP1070553A1 (en) * | 1999-07-17 | 2001-01-24 | Dieter Müller | Process for coating hot-dip zinc galvanized iron or steel articles |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3017680C2 (en) | 1985-10-03 |
| JPS55152055A (en) | 1980-11-27 |
| GB2050867B (en) | 1983-08-03 |
| DE3017680A1 (en) | 1980-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |