CN111605208A - Method for hot vulcanization bonding of natural rubber and metal structural part - Google Patents
Method for hot vulcanization bonding of natural rubber and metal structural part Download PDFInfo
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- CN111605208A CN111605208A CN202010388707.XA CN202010388707A CN111605208A CN 111605208 A CN111605208 A CN 111605208A CN 202010388707 A CN202010388707 A CN 202010388707A CN 111605208 A CN111605208 A CN 111605208A
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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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
- B29C66/0222—Mechanical pre-treatments, e.g. reshaping without removal of material, e.g. cleaning by air blowing or using brushes
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
- B29C66/022—Mechanical pre-treatments, e.g. reshaping
- B29C66/0224—Mechanical pre-treatments, e.g. reshaping with removal of material
- B29C66/02245—Abrading, e.g. grinding, sanding, sandblasting or scraping
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
- B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
- B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
- B29C66/7422—Aluminium or alloys of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/06—Sulfur
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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Abstract
The invention belongs to the field of rubber and metal bonding, and particularly relates to a hot vulcanization bonding method for natural rubber and a metal structural member. The method comprises the following steps: (1) degreasing and sand blasting the surface of the metal structural part, wherein the sand blasting direction of the surface of the metal structural part and the 180-degree stripping direction of the rubber-metal structural part form a 135-degree angle during the sand blasting treatment; spraying a hot vulcanization adhesive on the surface of the metal structural part treated in the step (1); (3) and (3) putting the metal structural part sprayed with the hot vulcanization adhesive in the step (2) and the natural rubber compound mixed with the surface coating rubber into a vulcanization forming die for vulcanization forming. The method of the invention ensures that the metal structural part and the natural rubber are bonded more firmly; the high and low temperature resistance of the bonding interface is excellent, and the bonding strength is still kept above 8kN/m in a high temperature environment above 100 ℃ and a low temperature environment below 40 ℃; the method is simple to operate, is an improved hot vulcanization bonding process, has low cost, and is suitable for industrial production and popularization.
Description
Technical Field
The invention belongs to the field of rubber and metal bonding, and particularly relates to a method for bonding natural rubber and a metal structural member through hot vulcanization.
Background
With the continuous development of science and technology and manufacturing industry, metal rubber bonding products with metal functions and the properties of rubber shock absorption, wear resistance, rust resistance and the like are needed in some fields, and at present, a heat vulcanization bonding system of natural rubber and metal structural parts is widely applied to the fields of aerospace, ship manufacturing, military industry and the like, such as rubber hanging on the inner side and the outer side of a tank track shoe, a track shoe bushing or an aviation oil seal and the like. The method using vulcanization bonding is a method by which a firm bonding force can be easily obtained.
At present, the main operation flow of the hot vulcanization bonding of metal and rubber is as follows: (1) processing the surface of the metal piece; (2) coating an adhesive on the surface of the metal piece; (3) heating and pressurizing the rubber compound and the metal piece coated with the adhesive for vulcanization. CN102115542A describes the surface treatment of metal parts, the selection of adhesive and the control of the heating and pressurizing process flow in detail, and the 180-degree peel strength of the metal parts can reach 13 kN/m; CN101824287A adopts a process of directly attaching an adhesive film and a raw rubber sheet, and the 180-degree peel strength of the adhesive film reaches 5.6-7.2 kN/m; CN110144174A describes a method for bonding highly filled rubber compound with metal, the rubber compound fills a die cavity by adopting a flow process perpendicular to a bonding surface and a 180-degree stripping direction, the 180-degree stripping strength can reach 11.32-13.02 kN/m, and the dispersion degree of the stripping strength is obviously reduced, and the method is particularly suitable for a rubber injection molding process.
The invention aims to provide a method for hot vulcanization bonding of natural rubber and metal, which comprises the following steps: the surface of the metal structural member and the 180-degree peeling direction of the rubber-metal structural member form a 135-degree angle during sand blasting, when the adhesive is sprayed, the bottom glue is firstly sprayed along the peeling direction of the rubber-metal structural member and then is sprayed perpendicular to the peeling direction of the rubber-metal structural member, and part of the surface glue is a component of natural rubber compound, so that the compatibility between two interfaces is improved, and the bonding strength is improved. Compared with the prior art, the invention can ensure that the bonding between metal and natural rubber is more firm, the high and low temperature resistance of the bonding interface is excellent, the operation is simple, the invention is an improved hot vulcanization bonding process, the cost is low, and the invention is suitable for industrialized popularization.
Disclosure of Invention
The invention aims to provide a hot vulcanization bonding method of natural rubber and a metal structural part.
The invention is realized by the following technical scheme: a hot vulcanization bonding method of natural rubber and a metal structural part comprises the following steps:
(1) degreasing and sand blasting the surface of the metal structural part, wherein the sand blasting direction of the surface of the metal structural part and the 180-degree stripping direction of the rubber-metal structural part form a 135-degree angle during the sand blasting treatment;
(2) spraying a hot vulcanization adhesive on the surface of the metal structural part treated in the step (1); the hot vulcanization adhesive comprises bottom coating adhesive and surface coating adhesive, wherein the bottom coating adhesive is sprayed to form a bottom coating adhesive layer, and then the surface coating adhesive is sprayed to form a surface coating adhesive layer; when spraying the bottom glue, firstly spraying a layer of bottom glue along the 180-degree peeling direction of the rubber-metal structural member, and then spraying a layer of bottom glue perpendicular to the 180-degree peeling direction of the rubber-metal structural member;
(3) and (3) putting the metal structural part sprayed with the hot vulcanization adhesive in the step (2) and the natural rubber compound mixed with the surface coating rubber into a vulcanization forming die for vulcanization forming to finish the hot vulcanization bonding of the natural rubber and the metal structural part.
As a further improvement of the technical scheme of the invention, the heat-vulcanized adhesive is a Kernel-Rockwell series adhesive, a Sibang series adhesive or a Rohm and Haas series adhesive.
In the invention, the primer coating of the Kernel-Lok series adhesive is preferably Chemlok205, and the top coating is preferably Chemlok 220; the primer coating of the Xibang series adhesive is preferably cilbond12, and the top coating is preferably cilbond 24; the primer for the Rohm and Haas series adhesives is preferably Thixon P-11-EF, and the topcoat for the Rohm and Haas series adhesives is preferably Megum 538. In the present invention, the top coating rubber used for the top coating rubber layer may be the same as or different from the top coating rubber in the natural rubber compound mixed with the top coating rubber.
As a further improvement of the technical scheme of the invention, the metal structural part is made of high manganese steel, common steel, aluminum or titanium alloy.
As a further improvement of the technical scheme of the invention, the degreasing method in the step (1) is ultrasonic alkali liquor cleaning, and specifically comprises the following steps: putting the prepared alkali liquor and the metal structural part into an ultrasonic cleaning machine together, and carrying out ultrasonic treatment for 30min at the power of 200W; the formula of the alkali liquor is 30-50 g/L of sodium hydroxide, 15-25 g/L of sodium carbonate, 10-15 g/L of sodium silicate and 50-70 g/L of sodium phosphate.
As a further improvement of the technical scheme of the invention, the formula of the natural rubber compound mixed with the surface coating in the step (3) is as follows: 100 parts of natural rubber, 1-2 parts of stearic acid, 8-10 parts of zinc oxide, 40101-2 parts of an anti-aging agent, 1-2 parts of an accelerator CZ, 60-70 parts of N660 carbon black, 5-10 parts of nano silicon dioxide, 2-3 parts of sulfur and 1-2 parts of dried top coating.
As a further improvement of the technical scheme of the invention, the step of vulcanization molding in the step (3) comprises the following steps: and (3) placing the metal structural part sprayed with the hot vulcanization adhesive and the natural rubber compound mixed with the surface coating in an oven, heating to 120-130 ℃, keeping for 10-15 min, and then immediately placing in a vulcanization forming mold, wherein the mold temperature is 150-170 ℃, the pressure is 10-20 MPa, and the vulcanization time is 15-20 min.
Compared with the prior art, the invention has the following advantages: the bonding between the metal structural member and the natural rubber is firmer, the 180-degree peel strength of the bonding member can reach 10.20kN/m on average when the bonding member is peeled, and the 180-degree peel strength of the bonding member is only 5.25kN/m on average when the common hot vulcanization bonding is adopted; in addition, the high and low temperature resistance of the bonding interface is excellent, and the bonding strength is still kept above 8kN/m in a high temperature environment above 100 ℃ and a low temperature environment below 40 ℃; the method is simple to operate, is an improved hot vulcanization bonding process, has low cost, and is suitable for industrial production and popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the sandblasting process of the present invention.
FIG. 2 is a schematic view of the primer adhesive application of the present invention.
In the figure: 1-a nozzle for sand blasting, 2-a flat-plate metal structural member, 3-a spray gun and 4-a step-shaped metal structural member.
The vertical arrow direction in fig. 1 is the sand blasting direction, and forms an angle of 135 degrees with the 180-degree stripping direction (oblique arrow) of the rubber-metal structural part.
In fig. 2, the arrow direction at the spray gun is the spraying direction, and the spraying is performed along the 180-degree peeling direction of the rubber-metal structural member first, and then is performed perpendicular to the 180-degree peeling direction of the rubber-metal structural member.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention will now be described with reference to specific examples.
The following comparative tests used the following formulations of the natural rubber compound with surface coating: 100 parts of natural rubber, 1.5 parts of stearic acid, 9 parts of zinc oxide, 40101 parts of an anti-aging agent, 1 part of a promoter CZ, 60 parts of N660 carbon black, 10 parts of nano-silica, 2.5 parts of sulfur and 1 part of surface coating glue (dried weight after drying a solvent);
the metal structural members used in the following comparative tests were all stepped metal structural members 4 made of high manganese steel in the shape shown in fig. 2.
The following comparative experiment adopted a method of degreasing a metal surface by ultrasonic cleaning with an alkali solution, wherein the formula of the alkali solution comprises 50g/L sodium hydroxide, 25 g/L sodium carbonate, 15 g/L sodium silicate and 70 g/L sodium phosphate, and the prepared alkali solution and metal are placed in an ultrasonic cleaning machine together and subjected to ultrasonic treatment at a power of 200W for 30 min.
The sand blasting mode adopted in the following comparative test is wet sand blasting, the compressed air used in the sand blasting is not lower than 0.5MPa, and the sand used in the sand blasting is quartz sand with the particle size of 0.5-1 mm.
The adhesives used in the following comparative tests were heat-vulcanized adhesives of the Kelmoko series, chemlok205 as the primer, chemlok220 as the topcoat, and chemlok220 as the topcoat in the natural rubber compound. The Kernel series of heat-curable adhesives are all available from Lode corporation, USA.
The spraying amount of the primer glue in the primer glue layer sprayed on the surface of the metal structural member in the following comparative test was 40g/m2The amount of the topcoat adhesive in the topcoat adhesive layer (excluding the topcoat adhesive in the rubber compound) sprayed was 20g/m2The amount of the natural rubber compound mixed with surface coating on the surface of the metal structural part is 1.5kg/m2。
A common hot vulcanization bonding method of natural rubber and metal comprises the following steps:
(1) carrying out sand blasting treatment on the degreased metal surface, and directly spraying according to a conventional operation method without limiting the spraying angle;
(2) spraying a hot vulcanization adhesive on the surface of the metal structural part treated in the step (1), directly spraying a layer of bottom glue according to a conventional method, and then spraying a layer of face glue, wherein the spraying direction and the spraying angle are not limited;
(3) and (3) putting the metal structural part sprayed with the hot vulcanization adhesive in the step (2) and the rubber compound mixed with the surface coating glue into a vulcanization forming die for vulcanization forming, wherein the die temperature is 160 ℃, the pressure is 15MPa, and the vulcanization time is 20 min.
The prepared 6 samples had 180 ℃ peel strengths of 4.32kN/m, 5.95kN/m, 4.98kN/m, 6.27kN/m, 5.11kN/m and 4.87kN/m, respectively, an average peel strength of 5.25kN/m, an average peel strength of 2.91kN/m at 100 ℃ and an average peel strength of 3.76 kN/m at-40 ℃.
A method for hot vulcanization bonding of natural rubber and a metal structural part comprises the following steps:
(1) performing sand blasting treatment on the degreased metal surface, and performing sand blasting according to the method shown in figure 1, wherein the sand blasting direction and the 180-degree stripping direction of the rubber-metal structural member form an angle of 135 degrees; correspondingly, 3 groups of sand blasting directions and 180-degree stripping directions of the rubber-metal structural part form an angle of 45 degrees, an angle of 90 degrees and an angle of 180 degrees respectively;
(2) directly spraying a layer of bottom glue on the surface of the metal structural part treated in the step (1) according to a conventional operation method, and then spraying a layer of face glue without limiting the spraying direction and the spraying angle;
(3) and (3) putting the metal structural part sprayed with the adhesive in the step (2) and the rubber compound mixed with the surface coating glue into a vulcanization forming die for vulcanization forming, wherein the die temperature is 160 ℃, the pressure is 15MPa, and the vulcanization time is 20 min.
When the sand blasting direction and the 180-degree peeling direction of the rubber-metal structural member form an angle of 135 degrees, the 180-degree peeling strength of the prepared 6 sample pieces at normal temperature is 5.98kN/m, 7.12kN/m, 7.03kN/m, 6.88kN/m, 7.32kN/m and 6.69kN/m respectively, the average peeling strength is 6.83kN/m, the bonding strength is increased, the average peeling strength at 100 ℃ is 4.23kN/m, and the average peeling strength at-40 ℃ is 5.37 kN/m; when the sand blasting direction and the 180-degree peeling direction of the rubber-metal structural part form an angle of 45 degrees, an angle of 90 degrees and an angle of 180 degrees, the average peeling strength of the prepared sample piece at normal temperature is respectively 4.91kN/m, 5.38kN/m and 3.87kN/m, and is obviously lower than that of the sample piece prepared when the sand blasting direction is 135 degrees.
A method for hot vulcanization bonding of natural rubber and a metal structural part comprises the following steps:
(1) performing sand blasting treatment on the degreased metal surface, wherein the sand blasting direction and the 180-degree stripping direction of the rubber-metal structural member form an angle of 135 degrees according to the method shown in figure 1;
(2) -1 spraying a hot-vulcanization adhesive on the surface of the metal structural part treated in the step (1), according to the method shown in fig. 2, coating the bottom glue along the 180-degree peeling direction of the rubber-metal structural part, then coating the bottom glue perpendicular to the peeling direction of the rubber-metal structural part, and finally spraying a layer of top-coating adhesive;
(2) 2, directly spraying a layer of bottom glue on the surface of the metal structural part treated in the step (1) according to a conventional operation method, and then spraying a layer of face glue without limiting the spraying direction and the spraying angle;
(3) and (3) putting the metal structural part sprayed with the adhesive in the step (2) and the rubber compound mixed with the surface coating glue into a vulcanization forming die for vulcanization forming, wherein the die temperature is 160 ℃, the pressure is 15MPa, and the vulcanization time is 20 min.
When the primer is sprayed according to the method shown in the step (2) -1 and as shown in fig. 2, the prepared 6 samples respectively have 180-degree peel strengths of 8.26kN/m, 9.75kN/m, 8.55kN/m, 9.95kN/m, 9.97kN/m and 9.51kN/m at normal temperature, the average peel strength is 9.33kN/m, the bonding strength is remarkably increased, the average peel strength at 100 ℃ is 7.35kN/m, and the average peel strength at-40 ℃ is 8.67 kN/m; when the primer adhesive and the surface adhesive are directly sprayed according to the step (2) -2, the average peel strength of the prepared sample piece at normal temperature is 7.35kN/m, which is obviously smaller than that of the sample piece sprayed and prepared according to the method shown in the figure 2.
A method for hot vulcanization bonding of natural rubber and a metal structural part comprises the following steps:
(1) performing sand blasting treatment on the degreased metal surface, and performing sand blasting according to the method shown in figure 1, wherein the sand blasting direction and the 180-degree stripping direction of the rubber-metal structural member form an angle of 135 degrees;
(2) spraying a hot vulcanization adhesive on the surface of the metal structural part treated in the step (1), coating a layer of bottom coating adhesive along the peeling direction of the rubber-metal structural part according to the method shown in figure 2, then coating a layer of bottom coating adhesive perpendicular to the peeling direction of the rubber-metal structural part, and finally spraying a layer of top coating adhesive;
(3) placing the metal structural part sprayed with the adhesive in the step (2) and the rubber compound mixed with the surface coating glue in an oven to raise the temperature to 125 ℃ for 15min, and then quickly placing the metal structural part and the rubber compound in a vulcanization forming mold to be vulcanized and formed, wherein the mold temperature is 160 ℃, the pressure is 15MPa, and the vulcanization time is 20 min;
the 180-degree peel strength of 6 prepared samples at normal temperature is respectively 10.76kN/m, 9.15kN/m, 8.91kN/m, 11.18kN/m, 9.75kN/m and 11.54kN/m, the average peel strength is 10.2kN/m, so that the bonding strength between irregular metal and natural rubber is maximized, the average peel strength at 100 ℃ is 8.01kN/m, the average peel strength at-40 ℃ is 8.94kN/m, and the high-temperature resistance and the low-temperature resistance of a bonding interface are remarkably improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. A method for hot vulcanization bonding of natural rubber and a metal structural member is characterized by comprising the following steps:
(1) degreasing and sand blasting the surface of the metal structural part, wherein the sand blasting direction of the surface of the metal structural part and the 180-degree stripping direction of the rubber-metal structural part form a 135-degree angle during the sand blasting treatment;
(2) spraying a hot vulcanization adhesive on the surface of the metal structural part treated in the step (1); the hot vulcanization adhesive comprises bottom coating adhesive and surface coating adhesive, wherein the bottom coating adhesive is sprayed to form a bottom coating adhesive layer, and then the surface coating adhesive is sprayed to form a surface coating adhesive layer; when spraying the bottom glue, firstly spraying a layer of bottom glue along the 180-degree peeling direction of the rubber-metal structural member, and then spraying a layer of bottom glue perpendicular to the 180-degree peeling direction of the rubber-metal structural member;
(3) and (3) putting the metal structural part sprayed with the hot vulcanization adhesive in the step (2) and the natural rubber compound mixed with the surface coating rubber into a vulcanization forming die for vulcanization forming to finish the hot vulcanization bonding of the natural rubber and the metal structural part.
2. The method of claim 1, wherein the heat-cured adhesive is selected from the group consisting of Kelmogue series adhesives, Sibang series adhesives, and Rohm and Haas series adhesives.
3. The method for hot vulcanization bonding of natural rubber to a metal structural member as claimed in claim 1 or 2, wherein the metal structural member is made of high manganese steel, ordinary steel, aluminum, or titanium alloy.
4. The method for hot vulcanization bonding of natural rubber and a metal structural part according to claim 1 or 2, characterized in that the degreasing method in step (1) is ultrasonic alkali cleaning, the prepared alkali and the metal structural part are placed in an ultrasonic cleaning machine together, and ultrasonic treatment is performed at 200W for 30 min; the formula of the alkali liquor is 30-50 g/L of sodium hydroxide, 15-25 g/L of sodium carbonate, 10-15 g/L of sodium silicate and 50-70 g/L of sodium phosphate.
5. The method for hot vulcanization bonding of natural rubber to a metal structural member as claimed in claim 1 or 2, wherein the formula of the natural rubber compound mixed with surface sizing in step (3) is as follows: 100 parts of natural rubber, 1-2 parts of stearic acid, 8-10 parts of zinc oxide, 40101-2 parts of an anti-aging agent, 1-2 parts of an accelerator CZ, 60-70 parts of N660 carbon black, 5-10 parts of nano silicon dioxide, 2-3 parts of sulfur and 1-2 parts of dried top coating.
6. The method for hot vulcanization bonding of natural rubber and a metal structural member according to claim 1 or 2, wherein the vulcanization molding in the step (3) is performed by: and (3) placing the metal structural part sprayed with the hot vulcanization adhesive and the natural rubber compound mixed with the surface coating in an oven, heating to 120-130 ℃, keeping for 10-15 min, and then immediately placing in a vulcanization forming mold, wherein the mold temperature is 150-170 ℃, the pressure is 10-20 MPa, and the vulcanization time is 15-20 min.
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