CN111152393A - Method for improving interface binding force of steel belt and grafted polyethylene - Google Patents
Method for improving interface binding force of steel belt and grafted polyethylene Download PDFInfo
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- CN111152393A CN111152393A CN202010005752.2A CN202010005752A CN111152393A CN 111152393 A CN111152393 A CN 111152393A CN 202010005752 A CN202010005752 A CN 202010005752A CN 111152393 A CN111152393 A CN 111152393A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/20—Use of solutions containing silanes
Abstract
The invention relates to a method for improving the interface binding force of a steel belt and grafted polyethylene. The method comprises the following steps: immersing a steel substrate into Galfan molten alloy liquid at the temperature of 420-450 ℃ for 5-10 s to obtain a plated part with a hot dip alloy layer; (2) and immersing the plated part obtained in the above step into a passivation solution for 1-3 hours, and drying for 0.5-1 hour after passivation is completed to obtain the plated part. (3) And paving the bonding resin on one surface or two surfaces of the passivated plating piece obtained on the bonding resin, and performing hot pressing to obtain the plastic-coated steel strip, wherein the passivating solution comprises a silane coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, ethanol and deionized water. The invention can save at least 66.7-80% of materials, and greatly reduce the production cost. The performance is improved, and the phenomenon that the film-forming agent is easy to fall off when being coated is solved; and the implementation method is simple and easy to realize.
Description
Technical Field
The invention relates to the technical field of corrosion-resistant protective coatings, in particular to a method for improving the interface bonding force between a steel belt and grafted polyethylene in a steel belt reinforced polyethylene spiral corrugated pipe.
Background
The steel belt reinforced Polyethylene (PE) spiral corrugated pipe (MRP) takes High Density Polyethylene (HDPE) as a substrate (inner and outer layers), and a steel belt coated with modified polyethylene on the surface is formed into a wave shape to be used as a main supporting structure. The steel belt is arched and can bear large force, and is wound with polyethylene to form the spiral corrugated pipe. MRP has the characteristics of good corrosion resistance, high strength and the like, and is widely applied to large-scale projects such as urban underground pipe networks and the like. At present, the strip steel of the corrugated pipe lining is hot galvanizing strip steel. The bonding force between the coating and a polymer layer is not ideal after the coating, so that the production is influenced due to the blockage of a die hole when the film forming agent is coated.
Because the steel strip and the PE are combined by metal and organic matters, the service life of the corrugated pipe is determined by the interface combination. Factors influencing the binding force of the steel strip and the PE include the usage amount of the binding resin, the thickness of the steel strip, the usage of the passivating agent and the like, and the usage amount of the binding resin and the thickness of the steel strip can be unified in specification from cost and practical application. The research at home and abroad finds that the corrosion resistance, the coating property and other properties of the alloy layer of the hot galvanizing can be changed by adding the alloy elements.
The passivating agent for the surface of the strip steel is chromate widely, and hexavalent chromium seriously pollutes the environment and damages the human health. KH560 can improve the adhesive property between resin and adhesive and the base, and has no toxicity, no pollution and low cost. If it can be applied, it is possible to prevent contamination while saving the production cost. The previous research only simply replaces the hot dip coating on the surface of the steel strip, and adds aluminum element (CN201910693834.8) or magnesium element (CN201910506239.9) into the original zinc liquid to enhance the corrosion resistance and the aesthetic property of the surface of the steel strip. But the adhesion with organic matters after the coating of the steel strip is changed is not studied.
Therefore, the research on the influence of elements such as zinc and aluminum on the combination of the hot-dip galvanized alloy layer and the plastic corrugated pipe has important significance for further improving the combination force of the corrugated pipe composite layer, meeting the use requirements of different environments and solving the problem that how to improve the combination force of the steel strip and the polyethylene is urgently needed to be solved in the present society.
Disclosure of Invention
The invention aims to provide a method for improving the interface bonding force of a steel belt and grafted polyethylene, aiming at the defects in the prior art. The method adds Al element into the pure Zn coating of the strip steel, and then uses silane coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane hydrolysate for passivation treatment, thereby improving the bonding performance of a steel matrix and grafted polyethylene.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for improving the interface bonding force of a steel strip and grafted polyethylene comprises the following steps:
(1) immersing a steel substrate into Galfan molten alloy liquid at the temperature of 420-450 ℃ for 5-10 s to obtain a plated part with a hot dip alloy layer;
the thickness of the alloy layer is 1-10 mu m;
(2) immersing the plated part obtained in the above step into a passivation solution for 1-3 hours, and drying for 0.5-1 hour after passivation is completed to obtain a surface-passivated plated part;
the passivation solution comprises a silane coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, ethanol and deionized water, wherein the volume ratio of the silane coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane: ethanol: 18 parts of deionized water, (0.8-1.5): (1.2-0.5);
(3) one side or two sides of the passivated plated part obtained by spreading the bonding resin on the surface are hot-pressed to obtain a plastic-coated steel strip;
the hot pressing parameters are as follows: hot pressing for 3-8 min at the temperature of 200-300 ℃ and under the pressure of 8-15 Mp;
wherein, the bonding resin is grafted polyethylene; the thickness of the resin is 0.5-2 mm.
The thickness of the steel substrate in the step (1) is 0.5-2 mm.
The thickness of the alloy layer obtained in the step (1) is preferably 1 to 5 μm, and the roughness Ra is 1.0 to 1.5 μm;
the drawing speed of the plated part in the step (1) is 2.5 cm/s.
The grafted polyethylene is preferably maleic anhydride grafted polyethylene.
The steel substrate is carbon structural steel, preferably as follows: q195, Q215 or Q235 carbon structural steel.
The invention has the substantive characteristics that:
the invention provides a method for improving the interface binding force of a steel belt and grafted polyethylene, which achieves the following effects through specific technological process technological parameters: the coating in the interface of the steel substrate/coating is changed from hot dip Zn to hot dip Galfan, the thickness of the coating is 1-5 mu m, and Al element and a small amount of rare earth elements cerium and lanthanum are added, so that the coating has better corrosion resistance and aesthetic property and saves cost; secondly, Al element in the hot dip plated Galfan and Si-OH bond in the grafted polyethylene can possibly form chemical bond to improve the bonding force with the grafted polyethylene; and (III) after the passivated sample is contacted with the bonding resin, the polyethylene can be promoted to generate a ring-opening reaction and further react with the passivation film, the bonding performance of the plating layer and the grafted polyethylene can be improved again as shown in figure 1, and the sample with high bonding force can be seen to be bonded with more resin wires at the section after the tensile sample is finished as shown in figure 3.
The invention has the beneficial effects that:
the hot dip Galfan coating layer with the thickness of 1-5 mu m is formed on the interface of a steel matrix. Compared with a plating layer with a hot dip Zn coating layer of 15-25 mu m, the hot dip Galfan alloy has a thinner plating layer. At least 66.7-80% of materials can be saved, and the production cost is greatly reduced.
The invention not only reduces the production cost, but also improves the bonding force of the grafted polyethylene and the matrix, and the bonding force of the hot-dip Galfan and the grafted polyethylene is improved by 84.6 percent compared with the hot-dip Zn in the prior art without passivation treatment; after passivation treatment, the bonding force of the hot-dip Galfan and the grafted polyethylene is improved by 63.8 percent compared with that of the hot-dip Zn as shown in figure 2. Solves the problem of easy falling off when coating film-forming agent. The implementation method is simple and easy to realize.
Drawings
FIG. 1 is a graph showing the variation trend of the binding force with the binding resin before and after passivation of hot dip Zn and Galfan in the examples;
FIG. 2 is a graph showing the change of roughness before and after hot dip Zn and Galfan passivation and the increase rate of the hot dip Zn-Galfan passivation binding force compared with that of hot dip Zn-Zn plating in the example;
FIG. 3 is a scanning electron micrograph of a failure section of different coatings and polyethylene in an example; wherein, FIG. 3a is a scanning electron microscope image of hot dip Zn plating; FIG. 3b is a scanning electron microscope image of the passivating hot dip Zn plating; FIG. 3c is a scanning electron micrograph of hot dip Galfan; FIG. 3d is a scanning electron micrograph of a passivated hot dip Galfan;
FIG. 4 is a schematic view of a plastic coating process;
Detailed Description
The present invention will be described in more detail by examples.
The hot dip coating is operated in a well furnace, the temperature range of the hot dip coating Galfan alloy is 420-450 ℃, and the temperature range of the hot dip coating Zn is 450-470 ℃. Because the manual error exists in the hot dipping process, the thickness of the plating layer can not keep the same thickness, and the thickness range is adopted to unify the thickness specification of the sample.
The Galfan alloy liquid is obtained by melting Galfan alloy ingots, the alloy ingots are purchased from Tianjin, Industrial Zinc plating equipment, Inc., the model of the Galfan ingot used by ASTM specification is UNS Z38510, the main components are zinc, aluminum and trace rare earth elements such as cerium, lanthanum, etc., and the alloy liquid is a known material.
Example 1
The test adopts Q235 carbon constructional steel, the size of a steel strip is 15cm multiplied by 5cm multiplied by 0.5mm, the steel strip is soaked in a molten Zn liquid at 450 ℃ for 15 seconds to carry out hot-dip Zn plating, and the thickness of a plating layer is 15-25 mu m. The drawing speed of the plated piece in the hot dip plating process is 2.5 cm/s. Roughness Ra of 0.9 μm, Fe in the order from the surface of the steel substrate to the outside5Zn21Phase (gamma phase), FeZn7Phase (. delta.) phase, FeZn13And (3) phase (zeta phase) and pure zinc phase (η phase), respectively paving 1 mm-thick maleic anhydride grafted polyethylene (PE-g-MAH) on two surfaces of the prepared plated part by using a flat vulcanizing machine, and carrying out hot pressing at 240 ℃, under the pressure of 10Mp and under the hot pressing time of 5min to coat the grafted polyethylene to obtain a finished product.
The performance test of the plastic coating process comprises the following steps:
the plastic coating process is that maleic anhydride grafted polyethylene (PE-g-MAH) (the thickness of the polyethylene is 1mm) is flatly laid on a plating piece, another same plating piece is covered on the plating piece, a hollow iron frame with the thickness of 2mm is placed at the edge of a sample, and finally the sample is placed into a flat vulcanizing machine for hot pressing, wherein the hot pressing temperature is 240 ℃, the pressure is 10Mp, and the hot pressing time is 5 min. The tail part of the hot-pressed sample is bent by 90 degrees and is in a T shape, as shown in figure 4. The plastic-coated test specimens were cut into test specimen strips of 15 cm. times.3 cm. times.2 mm. The binding force of the T-shaped test strip sample is measured by using an electronic universal tester, the tensile test speed is 50mm/min, the test times are 3 times, and the average binding force is 106.6N.
Example 2
Q235 carbon structural steel is adopted in the experiment, the size of a steel strip sample is 15cm multiplied by 5cm multiplied by 0.5mm, the steel strip is soaked in a Galfan molten alloy bath at the temperature of 420 ℃ for 20 seconds, the Galfan alloy is hot-dipped, the thickness of a plating layer is 1-5 mu m, and the drawing speed of a plated part in the hot dipping process is 2.0 cm/s. Roughness Ra 1.2 μm. An Fe-Al compound layer is formed on the surface of the steel base, and the outer layer is a Zn-Al alloy layer. And respectively paving maleic anhydride grafted polyethylene (PE-g-MAH) with the thickness of 1mm on two surfaces of the prepared plated part by using a flat vulcanizing machine, and carrying out hot pressing, wherein the hot pressing temperature is 240 ℃, the pressure is 10Mp, and the hot pressing time is 5min, and coating the grafted polyethylene to prepare a sample.
The performance test of the plastic coating process comprises the following steps:
the plastic coating process is that maleic anhydride grafted polyethylene (PE-g-MAH) (the thickness of the polyethylene is 1mm) is flatly laid on a plating piece, another same plating piece is covered on the plating piece, a hollow iron frame with the thickness of 2mm is placed at the edge of a sample, the thickness of the polyethylene is ensured to be 1mm, and finally the sample is placed into a flat vulcanizing machine for hot pressing, the hot pressing temperature is 240 ℃, the pressure is 10Mp, and the hot pressing time is 5 min. The tail part of the hot-pressed sample is bent by 90 degrees and is in a T shape, as shown in figure 4. The plastic-coated sample is cut into sample strips with the thickness of 15cm multiplied by 3cm multiplied by 2mm all at once, an electronic universal tester is used for measuring the binding force of the T-shaped sample strips, the tensile test speed is 50mm/min, the test times are 3 times, and the average binding force is 196.3N.
Example 3
Q235 carbon structural steel is adopted in the experiment, the size of a steel strip sample is 15cm multiplied by 5cm multiplied by 0.5mm, the steel strip is soaked in a molten alloy bath at the temperature of 450 ℃ for 15 seconds, hot-dip Zn is carried out, and the thickness of a plating layer is 15-25 mu m. The drawing speed of the plated piece in the hot dip plating process is 2.5 cm/s. Roughness Ra of 1.1 μm, Fe in the order from the surface of the steel substrate to the outside5Zn21Phase (gamma phase), FeZn7Phase (. delta.) phase, FeZn13And (3) a phase (zeta phase) and a pure zinc phase (η phase), soaking in a passivation solution prepared from 5% of KH-560 (gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane), 5% of deionized water and 90% of ethanol for 2 hours at room temperature, and drying to obtain a passivated plated part with a passivated surface, spreading maleic anhydride grafted polyethylene (PE-g-MAH) with the thickness of 1mm on two surfaces of the plated part respectively by using a flat vulcanizing machine, and hot-pressing at the temperature of 240 ℃ and the pressure of 10Mp for 5 minutes to coat the grafted polyethylene to prepare a sample.
The performance test of the plastic coating process comprises the following steps:
the method comprises the steps of flatly laying maleic anhydride grafted polyethylene (PE-g-MAH) (the thickness of the polyethylene is 1mm) on a plating part, covering another same plating part on the plating part, placing a hollow iron frame with the thickness of 2mm at the edge of a sample to ensure that the thickness of the polyethylene is 1mm, and finally placing the sample into a flat vulcanizing machine for hot pressing, wherein the hot pressing temperature is 240 ℃, the pressure is 10Mp, and the hot pressing time is 5 min. The tail part of the hot-pressed sample is bent by 90 degrees and is in a T shape, as shown in figure 4. The plastic-coated sample is cut into sample strips with the thickness of 15cm multiplied by 3cm multiplied by 2mm all at once, an electronic universal tester is used for measuring the binding force of the T-shaped sample strips, the tensile test speed is 50mm/min, the test times are 3 times, and the average binding force is 184.7N.
Example 4
Q235 carbon structural steel is adopted in the experiment, the size of a steel strip sample is 15cm multiplied by 5cm multiplied by 0.5mm, the steel strip is soaked in a molten alloy bath at the temperature of 420 ℃ for 20 seconds, the Galfan alloy is hot-plated, and the thickness of a plating layer is 1-5 mu m. The drawing speed of the plated piece in the hot dip plating process is 2.0 cm/s. The roughness Ra was 1.3 μm, and an Fe-Al compound layer was formed on the surface of the steel substrate, and the outer layer was a Zn-Al alloy layer. Then soaking the substrate in a passivation solution prepared by 5 percent of KH-560 (gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane), 5 percent of deionized water and 90 percent of ethanol for 2 hours at room temperature, and drying to obtain a passivated plating piece with a passivated surface. And respectively paving maleic anhydride grafted polyethylene (PE-g-MAH) with the thickness of 1mm on two surfaces of the prepared plated part by using a flat vulcanizing machine, and carrying out hot pressing, wherein the hot pressing temperature is 240 ℃, the pressure is 10Mp, and the hot pressing time is 5min, and coating the grafted polyethylene to prepare a sample.
The performance test of the plastic coating process comprises the following steps:
the plastic coating process is that maleic anhydride grafted polyethylene (PE-g-MAH) (the thickness of the polyethylene is 1mm) is flatly laid on a plating piece, another same plating piece is covered on the plating piece, a hollow iron frame with the thickness of 2mm is placed at the edge of a sample, the thickness of the polyethylene is ensured to be 1mm, and finally the sample is placed into a flat vulcanizing machine for hot pressing, the hot pressing temperature is 240 ℃, the pressure is 10Mp, and the hot pressing time is 5 min. The tail part of the hot-pressed sample is bent by 90 degrees and is in a T shape, as shown in figure 4. The plastic-coated sample is cut into sample strips with the thickness of 15cm multiplied by 3cm multiplied by 2mm all at once, an electronic universal tester is used for measuring the binding force of the T-shaped sample strips, the tensile test speed is 50mm/min, the test times are 3 times, and the average binding force is 248.5N.
After the tensile test, the passivated failure sections of fig. 3b and 3d are more difficult to separate than the non-passivated filamentary polyethylene of fig. 3a and 3c, indicating that the passivation improves the bonding of the matrix and the grafted polyethylene. The failure sections with Al element added in FIG. 3c and FIG. 3d are more than the failure sections with no added in the linear polyethylene in FIG. 3a and FIG. 3b, respectively, which shows that the hot-dip Galfan alloy improves the combination of the substrate and the grafted polyethylene.
From the above examples, it can be seen that the bonding force between the hot dip Zn-plated Galfan alloy and the grafted polyethylene of the present invention is increased after passivation. The hot dip Zn is from 106.6N to 184.7N, and the rising rate is 73.3 percent; the hot-dip Galfan is from 196.3N to 248.5N, and the rising rate is 26.6 percent. Whether the bonding force of the hot-dip Galfan subjected to passivation treatment and the grafted polyethylene is at least 63.8% higher than that of the hot-dip Zn or not, the bonding force of the hot-dip Galfan and the grafted polyethylene is increased by 84.6% compared with that of the hot-dip Zn without passivation treatment; and when the passivation treatment is carried out, the binding force of the hot-dip Galfan and the grafted polyethylene is improved by 63.8 percent compared with that of the hot-dip Zn.
The invention is not the best known technology.
Claims (6)
1. A method for improving the interface bonding force of a steel strip and grafted polyethylene is characterized by comprising the following steps:
(1) immersing a steel substrate into Galfan molten alloy liquid at the temperature of 420-450 ℃ for 5-10 s to obtain a plated part with a hot dip alloy layer;
the thickness of the alloy layer is 1-10 mu m; the steel substrate is carbon structural steel;
(2) immersing the plated part obtained in the above step into a passivation solution for 1-3 hours, and drying for 0.5-1 hour after passivation is completed to obtain a surface-passivated plated part;
the passivation solution comprises a silane coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, ethanol and deionized water, wherein the volume ratio of the silane coupling agent gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane: ethanol: 18 parts of deionized water, (0.8-1.5): (1.2-0.5);
(3) one side or two sides of the passivated plated part obtained by spreading the bonding resin on the surface are hot-pressed to obtain a plastic-coated steel strip;
the hot pressing parameters are as follows: hot pressing for 3-8 min at the temperature of 200-300 ℃ and under the pressure of 8-15 Mp;
wherein, the bonding resin is grafted polyethylene; the thickness of the resin is 0.5-2 mm.
2. The method for improving the interfacial bonding force of the steel strip and the grafted polyethylene according to claim 1, wherein the thickness of the steel substrate in the step (1) is 0.5-2 mm.
3. The method for improving the interfacial bonding force between the steel strip and the grafted polyethylene according to claim 1, wherein the alloy layer obtained in step (1) has a thickness of preferably 1 to 5 μm and a roughness Ra of 1.0 to 1.5 μm.
4. The method for improving the interfacial bonding force of the steel strip and the grafted polyethylene according to claim 1, wherein the withdrawing speed of the plated part in the step (1) is 2.5 cm/s.
5. The method for improving the interfacial bonding force between a steel strip and grafted polyethylene according to claim 1, wherein the grafted polyethylene is preferably maleic anhydride grafted polyethylene.
6. The method for improving the interfacial bonding force of the steel strip and the grafted polyethylene according to claim 1, wherein the steel substrate is preferably Q195, Q215 or Q235 carbon structural steel.
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