CN117324228A - Surface sealing modification method for floor cloth for rail transit vehicle - Google Patents
Surface sealing modification method for floor cloth for rail transit vehicle Download PDFInfo
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- CN117324228A CN117324228A CN202311245718.2A CN202311245718A CN117324228A CN 117324228 A CN117324228 A CN 117324228A CN 202311245718 A CN202311245718 A CN 202311245718A CN 117324228 A CN117324228 A CN 117324228A
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- floor cloth
- treatment
- surface treatment
- floor
- laser
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- 239000004744 fabric Substances 0.000 title claims abstract description 168
- 238000002715 modification method Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 title claims abstract description 15
- 238000005542 laser surface treatment Methods 0.000 claims abstract description 65
- 238000004381 surface treatment Methods 0.000 claims abstract description 64
- 239000000853 adhesive Substances 0.000 claims abstract description 54
- 230000001070 adhesive effect Effects 0.000 claims abstract description 54
- 238000011282 treatment Methods 0.000 claims abstract description 47
- 238000009991 scouring Methods 0.000 claims abstract description 32
- 239000003292 glue Substances 0.000 claims description 67
- 238000000034 method Methods 0.000 claims description 46
- 238000012545 processing Methods 0.000 claims description 33
- 238000005498 polishing Methods 0.000 claims description 31
- 229910000838 Al alloy Inorganic materials 0.000 claims description 16
- 150000004756 silanes Chemical class 0.000 claims description 13
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 12
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 12
- 230000000051 modifying effect Effects 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 9
- 239000004814 polyurethane Substances 0.000 claims description 9
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 8
- 238000013532 laser treatment Methods 0.000 claims description 6
- 239000013464 silicone adhesive Substances 0.000 claims description 6
- 229920002943 EPDM rubber Polymers 0.000 claims description 5
- 238000012360 testing method Methods 0.000 abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 125000000524 functional group Chemical group 0.000 abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 abstract description 5
- 239000001301 oxygen Substances 0.000 abstract description 5
- 239000000565 sealant Substances 0.000 abstract description 4
- 230000003746 surface roughness Effects 0.000 abstract description 4
- 239000011159 matrix material Substances 0.000 abstract description 3
- 238000009832 plasma treatment Methods 0.000 description 26
- 239000000463 material Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- 238000004140 cleaning Methods 0.000 description 9
- 239000002390 adhesive tape Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 230000037452 priming Effects 0.000 description 5
- 239000005060 rubber Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 230000004660 morphological change Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means
- B05D3/141—Plasma treatment
- B05D3/142—Pretreatment
- B05D3/144—Pretreatment of polymeric substrates
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
Abstract
The invention relates to the technical field of floor cloths for rail transit vehicles, in particular to a surface sealing modification method of a floor cloth for a rail transit vehicle. The invention carries out plasma surface treatment, laser surface treatment or scouring treatment on the front surface of the floor cloth, can activate the surface energy of the floor cloth and increase the surface roughness, and the plasma can increase the oxygen-containing polar functional groups and the surface energy of the surface of the matrix, so that the adhesive is easier to adhere. The 180-degree peeling test proves that the bonding strength of the surface sealant is improved in multiple compared with the initial state.
Description
Technical Field
The invention relates to the technical field of floor cloths for rail transit vehicles, in particular to a surface sealing modification method of a floor cloth for a rail transit vehicle.
Background
The bonding is an indispensable connection mode of the railway vehicle, and has the engineering characteristics of simple operation, low cost, no stress, sealing and the like. The floor cloth works as a clean foundation ground of the car body, and the sealing performance of the floor cloth has important significance for riding comfort and the like. The bottom surface of the floor cloth is adhered to the bottom of the car body and extends to the side wall part, and then the floor cloth is sealed by pressing strips and applying sealant.
The floor cloth is made of rubber or PVC products, and lines are arranged on the surface of the floor cloth to achieve the anti-skid effect so as to play a role in increasing friction force. However, in the process of forming the floor cloth, the mold surface is provided with a release agent for releasing the mold, the release agent is a difficult-to-adhere material, and the surface of the floor cloth is provided with a layer of hard and flexible material for achieving the purpose of friction resistance, so that the surface of the floor cloth has the difficult-to-adhere characteristic. At present, the engineering construction is completed by adopting sealant or matching sealant with a proper primer, and the primer with obvious effect on other difficult-to-stick materials is difficult to exert effect.
Therefore, the floor cloth surface treatment method has important significance for improving the safety of the vehicle body structure.
Disclosure of Invention
The invention discovers that the surface energy of the floor cloth can be activated and the surface roughness can be increased by carrying out plasma surface treatment, laser surface treatment or scouring treatment on the floor cloth.
The invention provides a surface sealing modification method of floor cloth, which comprises the following steps of carrying out plasma surface treatment on at least one surface of the floor cloth; during the plasma surface treatment, the focal length of the plasma generator is 2mm-5mm, and the treatment speed is 1mm/s-3mm/s.
It has been found that the plasma can increase the oxygen-containing polar functional groups and surface energy of the substrate surface, making the adhesive more prone to adhesion. The 180-degree peeling test proves that the surface bonding strength of the floor cloth subjected to surface treatment is improved in multiple compared with that of the floor cloth in the initial state. In plasma surface treatment, the focal length and the treatment speed of a plasma generator are key factors influencing the sealing and modifying effects on the surface of the floor cloth. When the focal length and the processing speed of the plasma generator are controlled within the above ranges, better processing results can be obtained.
In some embodiments, the plasma generator focal length is 2mm, 3mm, 4mm, or 5mm when the plasma surface is treated.
In some embodiments, the plasma surface treatment is performed at a treatment speed of 1mm/s, 2mm/s, or 3mm/s.
In some embodiments, the plasma surface treatment may employ a portable plasma generator.
Experiments show that the modification method for the plasma surface treatment is suitable for floor cloth made of styrene-butadiene rubber, EVA ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber.
The invention also provides another surface sealing modification method of the floor cloth, which comprises the steps of carrying out laser surface treatment on at least one surface of the floor cloth; when the laser surface is treated, the focal length of the laser treatment equipment is 300-500mm, the treatment speed is 10-15mm/s, and the power is 100-120W.
It is found that the focal length, processing speed and power of the laser processing equipment are key factors influencing the modifying effect of the bonding surface of the floor cloth during the laser surface treatment. When the focal length, processing speed, and power of the laser processing apparatus are controlled in the above ranges, better processing results can be obtained.
In some embodiments, the focal length of the laser processing device is 300mm, 400mm, or 500mm when the laser surface is processed.
In some embodiments, the laser surface treatment is performed at a treatment speed of 10mm/s, 11mm/s, 12mm/s, 13mm/s, 14mm/s, or 15mm/s.
In some embodiments, the laser surface treatment device has a power of 100W, 105W, 110W, 115W, or 120W.
Further, in the case of the laser surface treatment, the width of the laser surface treatment is 130mm to 170mm, specifically, for example, 130mm, 140mm, 150mm, 160mm or 170mm.
In some embodiments, the laser surface treatment may employ a gun-held laser surface treatment apparatus.
Experiments show that the modification method for the laser surface treatment is particularly suitable for floor cloths made of styrene-butadiene rubber, EVA ethylene-vinyl acetate copolymer and ethylene propylene diene monomer rubber.
The invention also discovers that the laser surface treatment and the plasma surface treatment are sequentially carried out on the floor cloth, so that the bonding strength of the floor cloth can be better improved, but the efficiency is lower, and the floor cloth can be selected from bonding joints with extremely high bonding strength requirements.
The invention also provides another surface sealing modification method of the floor cloth, which comprises the step of sequentially carrying out laser surface treatment and plasma surface treatment on at least one surface of the floor cloth.
In some embodiments, the method of laser surface treatment is the same as above.
In some embodiments, the method of plasma surface treatment is the same as above.
Specifically, when the floor cloth is subjected to laser surface treatment and plasma surface treatment in sequence, the parameters of the laser surface treatment are that the focal length of the equipment is 300-500mm, the treatment speed is 10-15mm/s, and the power is 100-120W; the parameters of the plasma surface treatment are that the focal length of the plasma generator is 2mm-5mm and the treatment speed is 1mm/s-3mm/s. At the moment, the modifying effect on the floor cloth is better.
Experiments show that the modification method for sequentially carrying out laser surface treatment and plasma surface treatment on the floor cloth is particularly suitable for the floor cloth made of styrene-butadiene rubber.
The invention also finds that the plasma surface treatment (the same method as above) and the laser surface treatment (the same method as above) are sequentially carried out on the floor cloth, so that the bonding strength cannot be well improved, and active groups formed on the surface of the floor cloth after the plasma treatment can be destroyed by the subsequent laser treatment.
The invention also provides another method for modifying the bonding surface of the floor cloth, which comprises the step of polishing at least one surface of the floor cloth by adopting the scouring pad. It has been found that the adhesive strength of the floor covering can be improved by polishing the surface scouring pad.
Further, when polishing treatment is performed using a scouring pad, the scouring pad is used in the area to be bonded in the lateral direction and the longitudinal direction, respectively, until the surface is matt.
Specifically, the present invention is not particularly limited as to the type of scouring pad. Industrial scouring pads are commonly available.
In some embodiments, the polishing process is mechanical polishing using a scouring pad.
The invention also provides another method for modifying the bonding surface of the floor cloth, which comprises the steps of polishing at least one surface of the floor cloth by adopting the scouring pad; then plasma surface treatment or laser surface treatment is performed.
It has been found that the adhesive strength of the floor covering can be further improved by adding a polishing step to the surface scouring pad. This method is particularly suitable for floor cloths where the improvement in performance is not evident for plasma treatment and laser treatment.
The invention also discovers that the polishing treatment and the plasma treatment are sequentially carried out on the floor cloth, so that the bonding strength of the floor cloth can be better improved.
Further, the polishing treatment method of the scouring pad is the same as that of the scouring pad.
Further, after polishing of the scouring pad is completed, the surface is cleaned with alcohol and dried (for example, 10 minutes).
Further, after the drying is completed, a plasma generator is used for plasma treatment, the focal length is 2mm-5mm, and the treatment speed is 1mm/s-3mm/s.
Further, the method of the laser surface treatment is the same as above; the method of the plasma surface treatment is the same as above.
In some embodiments, the at least one face of the floor covering is a floor covering face.
Herein, the front surface of the floor cloth refers to a visible surface of the floor cloth paved on the floor, and the surface has good wear resistance, skid resistance and the like. In order to distinguish from the bonding surface of the floor covering to the floor, the visible surface thereof is defined as the front surface.
In some embodiments, the floor covering is a rubber floor covering, such as a rubber floor covering that is applied to a rail transit vehicle floor (the substrate is an aluminum alloy).
In some embodiments, the floor cloth is made of styrene-butadiene rubber, EVA ethylene-vinyl acetate copolymer or ethylene propylene diene monomer.
In some embodiments, the method further comprises the step of cleaning the floor cloth to be treated prior to subjecting the floor cloth to the plasma surface treatment or the laser surface treatment. For example, the cleaning can be performed with alcohol to remove dust.
In some embodiments, the method further comprises the step of cleaning the treated floor covering after the plasma surface treatment, the laser surface treatment, and the scouring pad polishing treatment. For example, the cleaning can be performed with alcohol to remove dust.
The floor cloth bonding surface modification method is particularly suitable for edges and parts of the floor cloth, can be used at any angle, and has the characteristic of flexible operation. The 180-degree peeling test proves that the bonding strength of the floor cloth subjected to surface treatment is improved in multiple compared with that of the floor cloth in the initial state.
The invention also provides the modified floor cloth obtained by the method.
The invention also provides a surface sealing method of the floor cloth for the rail transit vehicle, which comprises the following steps:
modifying the floor cloth according to the method to obtain modified floor cloth;
respectively smearing a first adhesive and a second adhesive on the modified floor cloth and an aluminum alloy plate to be sealed for the rail transit vehicle;
and attaching the modified floor cloth coated with the first glue to the aluminum alloy plate coated with the second glue for the rail transit vehicle to be sealed.
In some embodiments, the step of applying a primer is further included before applying the first and/or second glue. In particular, the adhesive can be determined according to the types of the first adhesive and the second adhesive.
In some embodiments, after attaching the modified floor cloth coated with the first glue to the aluminum alloy plate to be sealed for rail transit vehicle coated with the second glue, the method further comprises the step of repeatedly pressing the sliding base material to fuse the glue layers as much as possible. In some embodiments, the method further comprises the step of drying and curing the glue layer. It is usually naturally dried.
In some embodiments, the method further comprises the step of pre-treating the aluminum alloy plate for rail transit vehicles to be sealed, for example, sanding the surface of the floor with 150 mesh or less.
In some embodiments, the first adhesive may be selected from the group consisting of polyurethane adhesives, silicone adhesives, modified silane adhesives, and the like.
In some embodiments, the second adhesive may be selected from the group consisting of polyurethane adhesives, silicone adhesives, modified silane adhesives, and the like.
In some embodiments, the first glue is the same as or different from the second glue.
In some embodiments, the substrate of the rail transit vehicle flooring to be sealed is an aluminum alloy, specifically, for example, a 6-series aluminum alloy material.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be mutually combined to obtain the preferred examples of the invention.
It should be noted that the terms "first," "second," and the like herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. Further, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The invention is not limited to the floor cloth for rail transit vehicles, and other floor cloths or materials are adopted or referred to the method in the protection range. The technology for improving the surface adhesiveness of the floor cloth based on the plasma surface modification and the laser modification has the characteristic of improving the surface adhesiveness of the floor cloth, and the method is simple, convenient and feasible, and the 180-degree peel test bonding strength of the treated floor cloth is improved in multiple compared with that of the original state. Technical support is provided for improving the bonding sealing reliability of the rail transit vehicle.
Drawings
FIG. 1 is a schematic view of a laser surface treatment according to an embodiment of the present invention; wherein 1 is a laser generator; 2 is the focal length; 3 is wide; and 4 is floor cloth.
FIGS. 2-7 are typical surface topography of the floor covering of example 1 of the present invention after 180℃peel test before and after modification.
Fig. 8 is a polishing surface treatment chart of the scouring pad of the present invention of example 2 and example 3.
FIG. 9 is a schematic diagram of the peel test of the adhesive tape of example 3 of the present invention.
Fig. 10 shows the initial adhesive tape release profiles of the floor cloths 2, 3 and 5 according to example 3 of the present invention.
FIG. 11 shows the appearance of the floor covering 2, the floor covering 3, and the floor covering 5 of example 3 after the peeling of the adhesive tape after plasma treatment.
Fig. 12 shows the appearance of the floor cloth 2, the floor cloth 3 and the floor cloth 5 according to the embodiment 3 after the polishing of the adhesive tape.
Fig. 13 shows the shapes of the floor cloths 2, 3 and 5 according to the embodiment 3 after polishing and plasma treatment and stripping of the adhesive tape.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The surface of the test piece was polished with 150-mesh sand paper using an aluminum alloy as a rigid material for the test.
The laser surface treatment according to the embodiment of the present invention can be seen in fig. 1. The following treatment methods are all floor cloths.
Example 1
6 different rubber floor cloths are selected, and absorbent cotton is adopted to dip alcohol for cleaning, so that dust is removed.
The floor cloth is made of the following materials:
floor cloth 1: floor cloth manufacturer a styrene-butadiene rubber;
floor covering 2: floor cloth producer B styrene butadiene rubber;
floor cloth 3: floor cloth producer C styrene butadiene rubber;
floor cloth 4: the floor cloth manufacturer D high-speed rail used EVA ethylene-vinyl acetate copolymer;
floor cloth 5: the floor cloth manufacturer D metro uses EVA ethylene-vinyl acetate copolymer;
floor cloth 6: floor covering manufacturer E ethylene propylene diene monomer. The cleaned floor cloth is respectively subjected to plasma surface treatment or laser surface treatment, and the method comprises the following steps of:
and (3) carrying out plasma surface treatment, namely treating the surface of the floor cloth by adopting a plasma generator PREZO BRUSH PZ3, wherein the focal length is 3mm, and the treatment speed is 2mm/s.
Laser surface treatment, laser LSF1500CH surface treatment, focal length 400mm, wide width 150mm, can process 5 strips simultaneously, processing speed 10mm/s, power 110W.
And (3) dipping the treated floor cloth in alcohol for secondary cleaning, drying, and applying glue (priming coating and gluing after priming coating of the adaptive primer) to uniformly coat.
The glue used is specifically as follows:
glue 1: adhesive manufacturer a modified silane adhesive 1;
glue 2: adhesive manufacturer B silicone adhesive;
glue 3: adhesive manufacturer C polyurethane adhesive 1;
glue 4: adhesive manufacturer D polyurethane adhesive 2;
glue 5: adhesive manufacturer E modified silane adhesive 2.
Glue 1 (i.e., modified silane glue) was primed with a matched primer (isocyanate polymer) to improve adhesion quality (priming was not applied after plasma treatment only for the initial state).
The surface of the aluminum alloy is cleaned by alcohol, and is coated with glue after being dried (the priming coating is carried out firstly and then the glue is coated after the priming coating is matched with the primer) and is uniformly coated. Wherein, the glue smeared on the surface of the aluminum alloy is the same as the glue smeared on the floor cloth.
The floor cloth in the initial state (i.e. without plasma surface treatment or laser surface treatment) and the floor cloth treated by the method are respectively stuck together with the aluminum alloy with the surface coated with the glue, the sliding base material is repeatedly extruded so that the glue layers are fused as much as possible, and then the glue layers are pressed on the sample by a heavy object until the glue layers are dried and cured for 7 days.
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 1 below and FIGS. 2-7. The values in Table 1 are 180℃peel strength (in N/mm), and a higher value in Table 1 indicates a greater 180℃peel strength, i.e., a better adhesion of the adhesive to the floor covering surface.
FIGS. 2-7 show typical surface topography of 6 floor cloths after 180℃peel test before and after modification, respectively.
TABLE 1
The result shows that the peeling strength of the samples after plasma treatment is improved, and the laser surface modification is only applicable to part of floor cloth and adhesives.
By activating the surface energy through plasma or laser surface treatment, the plasma can increase the oxygen-containing polar functional groups and the surface energy on the surface of the matrix, so that the adhesive is easier to adhere.
Example 2
The floor cloths 2, 3 and 5 of example 1, which had no remarkable effect of improving the adhesion property by plasma treatment and laser treatment, were selected to be divided into two groups. One group of the polishing agents is used for polishing the surface of the floor cloth in the transverse direction and the longitudinal direction respectively until the surface loses gloss. And the other group is that absorbent cotton is adopted to dip alcohol for cleaning after polishing treatment (the method is the same as that of the first group), and a plasma generator PREZO BRUSH PZ3 is adopted to treat the surface of the floor cloth after the surface is dried, so that the focal length is 3mm and the treatment speed is 2mm/s. The polishing method of the scouring pad can be seen in fig. 8.
Cleaning the floor cloth treated by the two groups by dipping absorbent cotton in alcohol, drying, applying glue, and uniformly coating.
The glue used is specifically as follows:
glue 1: adhesive manufacturer a modified silane adhesive 1;
glue 2: adhesive manufacturer B silicone adhesive;
glue 3: adhesive manufacturer C polyurethane adhesive 1;
glue 4: adhesive manufacturer D polyurethane adhesive 2;
glue 5: adhesive manufacturer E modified silane adhesive 2.
The surface of the aluminum alloy is cleaned by alcohol, and is coated with glue (the modified silane glue 1 needs to be coated with a matched primer to improve the bonding quality) after being dried, and the coating is uniform. Wherein, the glue smeared on the surface of the aluminum alloy is the same as the glue smeared on the floor cloth.
The floor cloth treated by the method is respectively stuck together with aluminum alloy coated with glue on the surface, the sliding base material is repeatedly extruded so that the glue layers are fused as much as possible, and then a heavy object is pressed on the sample until the glue layers are dried and cured for 7 days.
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 2 below. The values in Table 2 are 180℃post peel strength (in N/mm).
TABLE 2
The results show that the peel strength of the floor cloth is obviously improved after the surface of the floor cloth is polished by using the scouring pad compared with the original surface of the sample and the surface treated only by plasma. After polishing, the scouring pad is subjected to plasma treatment, and compared with the original surface of the sample and the surface subjected to plasma treatment only, the peel strength is obviously improved; the polishing of the scouring pad is closer, and the peeling strength is slightly improved.
The polishing of the scouring pad can increase the roughness of the surface of the floor cloth and increase the wetting surface area of the adhesive and the surface, thereby enhancing the adhesion between the adhesive and the surface of the substrate.
Example 3
The same floor cloths 2, 3 and 5 as in example 1 were cleaned with alcohol to remove dust.
Respectively carrying out plasma surface treatment, scouring pad polishing and plasma composite treatment on the cleaned floor cloth, wherein the steps are as follows:
and (3) carrying out plasma surface treatment, namely treating the surface of the floor cloth by adopting a plasma generator PREZO BRUSH PZ3, wherein the focal length is 3mm, and the treatment speed is 2mm/s.
Polishing the scouring pad, namely polishing the surface of the floor pad in the transverse direction and the longitudinal direction respectively until the surface loses gloss, and cleaning the treated floor pad by dipping absorbent cotton in alcohol. The polishing method of the scouring pad can be seen in fig. 8.
Polishing and plasma composite treatment are carried out on the surface of the floor cloth by using the scouring pad until the surface loses gloss, and the floor cloth after treatment is cleaned by dipping absorbent cotton in alcohol. And after drying, treating the surface of the floor cloth by adopting a plasma generator PREZO BRUSH PZ3, wherein the focal length is 3mm, and the treatment speed is 2mm/s.
The 4 groups of floor cloth samples (glue 1 and glue 3) in the initial state and subjected to the surface treatment by the above three methods were respectively glued, and a strip-off sample (see fig. 3) was prepared and cured for 7 days.
Glue 1: modified silane compound 1 (same as in example 1);
glue 3: polyurethane gel 1 (same as in example 1).
And (3) carrying out adhesive tape stripping test on the cured sample, observing the damage morphology of the adhesive tape, and qualitatively analyzing the bonding effect.
The results are shown in Table 3 and FIGS. 10-13.
TABLE 3 Table 3
The results show that the adhesion effect of the adhesive and the floor cloth can be gradually improved by adopting only plasma treatment, only scouring pad polishing treatment and scouring pad polishing and plasma treatment. Qualitative analysis, the improvement of interfacial adhesion failure is cohesive failure of the adhesive, i.e. the adhesion effect of the adhesive to the surface of the floor covering is improved.
Example 4
The floor cloth 5 similar to the example was selected and subjected to laser surface treatment, and the only difference from the example 1 was: laser surface treatment, laser LSF1500CH surface treatment, focal length 300mm, width 130mm, treatment speed 15mm/s and power 100W.
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 4 below. The values in Table 4 are 180℃post peel strength (in N/mm).
TABLE 4 Table 4
| Floor cloth/glue | Glue 1 | Glue 3 |
| Floor cloth 5 initially | 0.374 | 0.385 |
| Floor cloth 5 laser 2 | 0.807 | 1.385 |
The result shows that the peeling strength of the adhesive 1 and the adhesive 3 coated on the surface of the treated floor cloth 5 sample is improved.
By laser surface treatment, the surface can be cleaned, polar groups such as oxidized derivatives and hydroxides are introduced to achieve chemical modification of the surface, and uniform roughness of the surface results in morphological changes.
Example 5
The floor cloth 1 as in the example was selected, and the only difference from the example 1 was: firstly, adopting plasma surface treatment (adopting a plasma generator PREZO BRUSH PZ3 to treat the surface of the floor cloth, wherein the focal length is 3mm, and the treatment speed is 2 mm/s); then laser surface treatment (laser LSF1500CH surface treatment, focal length 400mm, width 150mm, 5 strips can be processed simultaneously, processing speed 10mm/s, power 110W) is adopted.
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 5 below. The values in Table 5 are 180℃post peel strength (in N/mm).
TABLE 5
The result shows that the plasma surface treatment is firstly carried out on the floor cloth, then the laser treatment is carried out, and the peeling strength is improved to a certain extent.
By plasma treatment, the surface energy is activated, and the oxygen-containing polar functional groups and the surface energy of the surface of the substrate are increased. The laser surface treatment improves the surface roughness, making the adhesive more adherent.
Example 6
The floor cloth 1 as in the example was selected, and the only difference from the example 1 was: firstly, adopting laser surface treatment (laser LSF1500CH surface treatment, focal length 400mm, width 150mm, 5 strips can be treated simultaneously, treatment speed 10mm/s and power 110W); then plasma surface treatment (the surface of the floor cloth is treated by a plasma generator PREZO BRUSH PZ3, the focal length is 3mm, and the treatment speed is 2 mm/s).
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 6 below. The values in Table 6 are 180℃post peel strength (in N/mm).
TABLE 6
The result shows that the laser surface treatment and the plasma treatment are performed on the floor cloth, so that the peeling strength can be better improved.
The surface roughness is improved by laser surface treatment, and then the surface energy is activated by plasma treatment, so that the oxygen-containing polar functional groups and the surface energy on the surface of the matrix are increased, and the adhesive is easier to adhere.
Experiment 1 study on plasma surface treatment
The same floor cloth 1 as in the example was used to examine the influence of the focal length and the processing speed of the plasma generator on the processing effect.
The specific operation method is the same as in example 1.
The plasma surface treatment 1 adopts a plasma generator PREZO BRUSH PZ3 to treat the surface of the floor cloth, the focal length is 2mm, and the treatment speed is 1mm/s.
The surface of the floor cloth is treated by a plasma generator PREZO BRUSH PZ3 with the plasma surface treatment 2, the focal length is 2mm, and the treatment speed is 3mm/s.
And 3, plasma surface treatment, namely treating the surface of the floor cloth by adopting a plasma generator PREZO BRUSH PZ3, wherein the focal length is 4mm, and the treatment speed is 1mm/s.
And 4, treating the surface of the floor cloth by adopting a plasma generator PREZO BRUSH PZ3, wherein the focal length is 5mm, and the treatment speed is 3mm/s.
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 7 below. The values in Table 7 are 180℃post peel strength (in N/mm).
TABLE 7
| Floor cloth/glue | Glue 1 | Glue 2 | Glue 3 | Glue 4 | Glue 5 |
| Floor cloth 1 initially | 0.781 | 1.001 | 3.887 | 1.490 | 5.447 |
| Floor cloth 1 plasma treatment 1 | 1.016 | 1.753 | 5.004 | 2.961 | 7.853 |
| Plasma treatment 2 of floor cloth 1 | 0.896 | 1.703 | 4.613 | 2.591 | 8.551 |
| Plasma treatment 3 of floor cloth 1 | 0.901 | 1.621 | 4.436 | 2.703 | 8.028 |
| Plasma treatment 4 of floor cloth 1 | 0.806 | 1.513 | 4.607 | 2.801 | 7.053 |
The result shows that the overall treatment effect is not very different when the focal length of the plasma generator is 2-5mm and the treatment speed is 1-3 mm/s.
Further examine the influence of the focal length of the plasma generator and the processing speed on the processing effect.
Respectively carrying out plasma surface treatment on the cleaned floor cloth, wherein the plasma surface treatment comprises the following steps:
and the plasma surface treatment 5 is to treat the surface of the floor cloth by adopting a plasma generator PREZO BRUSH PZ3, and has a focal length of 10mm and a treatment speed of 2mm/s.
The surface of the floor cloth was treated with a plasma generator PREZO BRUSH PZ3 at a focal length of 1mm and a treatment speed of 2mm/s by a plasma surface treatment 6.
The surface of the floor cloth was treated with a plasma generator PREZO BRUSH PZ3, focal length 5mm, and treatment speed 10mm/s by plasma surface treatment 7.
And the plasma surface treatment 8 is to treat the surface of the floor cloth by adopting a plasma generator PREZO BRUSH PZ3, and the treatment speed is 0.5mm/s and the focal length is 5mm.
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 8 below. The values in Table 8 are 180℃post peel strength (in N/mm).
TABLE 8
| Floor cloth/glue | Glue 1 | Glue 2 | Glue 3 | Glue 4 | Glue 5 |
| Floor cloth 1 initially | 0.781 | 1.001 | 3.887 | 1.490 | 5.447 |
| Plasma treatment 5 of floor cloth 1 | 0.706 | 1.210 | 3.689 | 1.503 | 4.976 |
| Plasma treatment 6 of floor cloth 1 | 1.112 | 1.603 | 4.602 | 2.990 | 7.331 |
| Plasma treatment 7 of floor cloth 1 | 0.762 | 1.092 | 3.964 | 1.491 | 8.553 |
| Plasma treatment 8 of floor cloth 1 | 0.916 | 1.631 | 4.402 | 3.021 | 7.923 |
The result shows that the bonding and peeling strength is not obviously improved when the focal length of the plasma generator is too large or the processing speed is too large, and the bonding and peeling strength is obviously improved when the focal length is too small or the processing speed is too small.
Experiment 2 study on laser surface treatment
The same floor cloth 1 and glue 1 (i.e. modified silane glue) as those in the embodiment are selected, and the influence of focal length, processing speed and power on the processing effect during the laser surface treatment is examined.
The specific operation method is the same as in example 1.
Laser surface treatment 1, laser LSF1500CH surface treatment, focal length 300mm, wide 130mm, can process 5 strips simultaneously, processing speed 10mm/s, power 100W.
Laser surface treatment 2, laser LSF1500CH surface treatment, focal length 500mm, broad width 170mm, can process 5 strips simultaneously, processing speed 15mm/s, power 120W.
Laser surface treatment 3, laser LSF1500CH surface treatment, focal length 400mm, wide width 150mm, can handle 5 strips simultaneously, processing speed 12mm/s, power 120W.
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 9 below. The values in Table 9 are 180℃post peel strength (in N/mm).
TABLE 9
| Floor cloth/glue | Glue 1 |
| Floor cloth 1 initially | 0.781 |
| Floor cloth 1 laser surface treatment 1 | 1.972 |
| Floor cloth 1 laser surface treatment 2 | 1.560 |
| Floor cloth 1 laser surface treatment 3 | 2.022 |
The results show that the overall treatment effect is not great when the focal length is 300-500mm, the treatment speed is 10-15mm/s and the power is 100-120W during the laser surface treatment.
Further, the influence of the focal length, the processing speed and the power on the processing effect during the laser surface processing (the minimum focal length of the equipment is 300mm, so that only the influence of the excessive focal length is examined).
Laser surface treatment 4, laser LSF1500CH surface treatment, focal length 700mm, wide width 200mm, 5 strips can be processed simultaneously, processing speed 10mm/s, and power 110W.
Laser surface treatment 5, laser LSF1500CH surface treatment, focal length 400mm, wide width 150mm, can handle 5 strips simultaneously, processing speed 20mm/s, power 110W.
Laser surface treatment 6, laser LSF1500CH surface treatment, focal length 400mm, wide width 150mm, can handle 5 strips simultaneously, processing speed 3mm/s, power 110W.
Laser surface treatment 7, laser LSF1500CH surface treatment, focal length 400mm, wide width 150mm, 5 strips can be processed simultaneously, processing speed 10mm/s, and power 75W.
Laser surface treatment 8, laser LSF1500CH surface treatment, focal length 400mm, wide width 150mm, 5 strips can be processed simultaneously, processing speed 10mm/s, power 150W.
The cured test specimens were tested on an electronic universal material tester, for peel strength and for failure location.
The results are shown in Table 10 below. The values in Table 10 are 180℃post peel strength (in N/mm).
Table 10
| Floor cloth/glue | Glue 1 |
| Floor cloth 1 initially | 0.781 |
| Laser surface treatment 4 of floor cloth 1 | 0.752 |
| Laser surface treatment 5 of floor cloth 1 | 0.622 |
| Floor cloth 1 laser surface treatment 6 | 0.801 |
| Laser surface treatment 7 of floor cloth 1 | 0.801 |
| Laser surface treatment 8 for floor cloth 1 | 0.522 |
The result shows that the bonding and peeling strength is not obviously improved when the focal length is too large or the treatment speed is too large or the power is too small in the laser surface treatment, the surface of the floor cloth is easily ablated when the power is too large or the treatment speed is too small, and the treatment effect is general.
As can be seen from the above results, the modified silane adhesive 2 has the highest bonding strength with each floor cloth; wherein, the floor cloth 2, the floor cloth 3 and the floor cloth 5 have the best bonding strength after polishing the surface treatment of the scouring pad, and the bonding effect is improved most obviously after plasma treatment of the floor cloth 1 and the floor cloth 4.
The invention discloses a surface treatment technology mainly according to the problems of adhering surfaces of floor cloths of railway vehicles, and relates to a plasma surface treatment and laser surface treatment technology. The invention is not limited to the floor cloth for the rail transit vehicle, and other floor cloths or rubber materials are adopted or referred to the method in the protection range. Any modification, equivalent replacement and improvement of the bonding behavior of the bonding joint by using the concept are included in the protection scope of the present invention.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (10)
1. A surface sealing modification method of floor cloth is characterized by comprising the steps of carrying out plasma surface treatment on at least one surface of the floor cloth; during the plasma surface treatment, the focal length of the plasma generator is 2mm-5mm, and the treatment speed is 1mm/s-3mm/s.
2. The method for modifying the surface seal of floor covering according to claim 1, wherein the focal length of the plasma generator is 2mm, 3mm, 4mm or 5mm when the surface of the floor covering is treated with plasma; and/or the number of the groups of groups,
in the plasma surface treatment, the treatment speed is 1mm/s, 2mm/s or 3mm/s.
3. A surface sealing modification method of floor cloth is characterized by comprising the steps of carrying out laser surface treatment on at least one surface of the floor cloth; when the laser surface is treated, the focal length of the laser treatment equipment is 300-500mm, the treatment speed is 10-15mm/s, and the power is 100-120W.
4. The method for modifying a surface seal of a floor covering according to claim 3, wherein the focal length of the laser processing apparatus is 300mm, 400mm or 500mm at the time of the laser surface treatment; and/or the number of the groups of groups,
the processing speed of the laser processing device is 10mm/s, 11mm/s, 12mm/s, 13mm/s, 14mm/s or 15mm/s; and/or the number of the groups of groups,
the power of the laser processing device is 100W, 105W, 110W, 115W or 120W; and/or the number of the groups of groups,
in the laser surface treatment, the width of the laser surface treatment is 130mm-170mm.
5. A floor cloth bonding surface modification method is characterized by comprising the steps of sequentially carrying out laser surface treatment and plasma surface treatment on at least one surface of floor cloth; wherein the method of plasma surface treatment is the same as in claim 1 or 2; the laser surface treatment method is the same as claim 3 or 4.
6. A floor cloth bonding surface modification method is characterized by comprising the steps of polishing at least one surface of floor cloth by using scouring pad;
alternatively, when polishing treatment is performed using a scouring pad, the scouring pad is used to polish the area to be bonded in the lateral and longitudinal directions, respectively, until the surface is matt.
7. A floor cloth bonding surface modification method is characterized by comprising the steps of polishing at least one surface of floor cloth by adopting scouring pad; then plasma surface treatment or laser surface treatment is carried out; wherein the method of plasma surface treatment is the same as in claim 1 or 2; the laser surface treatment method is the same as claim 3 or 4.
8. The method according to any one of claims 1 to 7, wherein the floor cloth is made of styrene-butadiene rubber, EVA ethylene-vinyl acetate copolymer or ethylene propylene diene monomer.
9. A modified floor covering obtainable by the process according to any one of claims 1 to 8.
10. A method of sealing a floor covering surface for a rail transit vehicle, comprising:
modifying a floor covering according to the method of any one of claims 1 to 8 to obtain a modified floor covering;
respectively smearing a first adhesive and a second adhesive on the modified floor cloth and an aluminum alloy plate to be sealed for the rail transit vehicle;
attaching the modified floor cloth coated with the first glue to an aluminum alloy plate coated with the second glue for the rail transit vehicle to be sealed;
optionally, the first adhesive is selected from polyurethane adhesive, silicone adhesive, modified silane adhesive; the second adhesive is selected from polyurethane adhesive, silicone adhesive and modified silane adhesive.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311245718.2A CN117324228A (en) | 2023-09-25 | 2023-09-25 | Surface sealing modification method for floor cloth for rail transit vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311245718.2A CN117324228A (en) | 2023-09-25 | 2023-09-25 | Surface sealing modification method for floor cloth for rail transit vehicle |
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