CN111171732B - Technological improvement method for bonding plastic back door and glass - Google Patents

Technological improvement method for bonding plastic back door and glass Download PDF

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Publication number
CN111171732B
CN111171732B CN202010064596.7A CN202010064596A CN111171732B CN 111171732 B CN111171732 B CN 111171732B CN 202010064596 A CN202010064596 A CN 202010064596A CN 111171732 B CN111171732 B CN 111171732B
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bonding
glass
outer plate
frame
back door
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CN111171732A (en
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刘彬
黄骏霖
刘剑平
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/02—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
    • 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
    • B05D3/02—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 baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J5/00—Doors
    • B60J5/10—Doors arranged at the vehicle rear
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/10—Presence of inorganic materials
    • C09J2400/14—Glass
    • C09J2400/143—Glass in the substrate

Abstract

The invention discloses a process improvement method for bonding a plastic back door and glass, which comprises the steps of firstly manufacturing an inner plate and an outer plate of the plastic back door, wherein the edges of the inner plate and the outer plate are provided with frame strips through an injection molding method, shielding the frame strips on the outer plate by using shielding objects, spraying low-temperature paint on the outer surface of the outer plate, and removing the shielding objects after the low-temperature paint is completely cured; the inner plate and the outer plate are bonded in an aligned mode, and the frame strips of the inner plate and the outer plate are spliced into a bonding frame matched with the glass; and finally, bonding the glass on the bonding frame. The invention leads the outer plate and the inner plate to be bonded with the glass at the same time, not only can meet the design requirement of complex molded surfaces, but also solves the problem of low bonding strength between the low-temperature paint substrate and the glass, the low-temperature paint spraying of the outer plate can share a paint spraying and baking production line with manufacturing parts such as PP, ABS and the like which are common materials in the exterior industry, and the construction cost of the paint spraying and baking production line is saved.

Description

Technological improvement method for bonding plastic back door and glass
Technical Field
The invention relates to the field of adhesion of automobile plastic back doors, in particular to a process improvement method for adhesion of a plastic back door and glass.
Background
The back door is an important opening and closing piece on an automobile luggage compartment, steel plates are usually selected as materials, the back door made of thermoplastic plastics is developed abroad in recent years, the weight of the back door can be reduced by 20% -40%, the shape which cannot be realized by the steel back door can be realized, the structural integration of parts and components can be realized, the modularization of the assembly of the back door can be realized, and meanwhile, the back door has the characteristics of good corrosion resistance and good wireless transmission performance. However, few manufacturers currently develop plastic back doors and apply the plastic back doors in mass production, the plastic back doors are generally formed by compounding an outer plate and an inner plate, the outer plate is formed by using PP (PP + EPDM), the inner plate is formed by using long glass fiber reinforced PP (PP-LGF), the plastic back doors are all formed by using an injection molding process, then the plastic back doors are bonded and assembled by using a glue coating and bonding process, and finally, back windshield glass is bonded, so that the assembly of the back doors is completed. The visible surface of the plastic back door outer plate generally needs to be sprayed with paint in the same color as the vehicle body, the paint is dried, and after being bonded with the inner plate, the plastic back door outer plate is bonded with the rear windshield glass. The paint is divided into high-temperature baking paint and low-temperature baking paint, the high-temperature baking paint has better performance, the requirement on the bonding performance is easier to meet during bonding, but the baking energy consumption is high, and the plastic back door outer plate is easy to deform at the baking temperature (120-150 ℃) and cannot be produced with other exterior parts in a collinear way; if the outer plate is sprayed with the low-temperature paint with the baking temperature of 70-90 ℃, the outer plate of the plastic back door cannot deform, and the energy consumption is low, however, even if the glass cement coated with the primer is poor in the bonding performance on the low-temperature paint substrate, the glass cement can only be bonded with the inner plate, so that the design of the profile of the plastic back door has limitation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an improved method for the bonding process of a plastic back door and glass, which aims to solve the problem of low bonding strength between an outer plate sprayed with low-temperature paint and the glass.
In order to solve the technical problems, the invention provides a process improvement method for bonding a plastic back door and glass, which comprises the following steps:
(1) manufacturing an inner plate and an outer plate of the plastic back door by an injection molding method, wherein frame strips for bonding glass are arranged at the edges of the inner plate and the outer plate of the plastic back door close to the edges, and after the inner plate and the outer plate are aligned, the frame strips of the inner plate and the outer plate are spliced into a bonding frame matched with the edge shape of the glass;
(2) shielding the frame strips on the outer plate by using a shielding adhesive tape, spraying low-temperature paint on the outer surface of the outer plate, baking at 70-90 ℃ after the paint is sprayed until the low-temperature paint is completely cured, and removing the shielding adhesive tape;
(3) the inner plate and the outer plate are bonded in an aligned mode, and the frame strips of the inner plate and the outer plate are spliced into a bonding frame;
(4) and carrying out surface treatment on the bonding frame to bond the glass on the bonding frame.
On the basis of the technical scheme, the outer surfaces of the inner plate and the outer plate are respectively provided with two parallel raised lines close to the edges, and the frame strips are positioned between the two parallel raised lines.
On the basis of the technical scheme, the width of the raised lines is less than 0.5mm, the height of the raised lines is less than 0.5mm, and the raised lines can be plaited by naked eyes.
On the basis of the technical scheme, the bonding frame is a rectangular frame.
On the basis of the technical scheme, the upper side and the lower side of the bonding frame are outer plate frame strips, and the left side and the right side of the bonding frame are inner plate frame strips.
On the basis of the technical scheme, the surface treatment means is flame burning or plasma treatment.
On the basis of the technical scheme, in the step (4), after surface treatment is carried out on the bonding frame, primer coating agent is coated; (i) coating glass cement in 24h, or (ii) coating primer again within 1-7 days and then coating the glass cement; and bonding the glass on the bonding frame.
On the basis of the technical scheme, the outer plate is made of a PP/EPDM composite material, and the inner plate is made of a PP/LGF composite material.
On the basis of the technical scheme, the shielding adhesive tape is a high-temperature-resistant adhesive tape, and no residue is left on the frame strip after the shielding adhesive tape is torn off.
On the basis of the technical scheme, the width of the frame strip is 8-25 mm, and the width of the frame strip is smaller than that of the glass black glaze, so that the glass cement is prevented from being irradiated by sunlight.
The invention has the following advantages and beneficial effects:
1. the plastic back door outer plate is sprayed with low-temperature paint to ensure that the plastic back door is not deformed after being baked; the outer plate and the inner plate are simultaneously bonded with the glass, so that on one hand, the design requirement of a complex molded surface can be met, on the other hand, the bonding strength of the glass and the plastic back door is improved, and the outer plate and the inner plate are the first case in China.
2. The outer plate is sprayed with paint and then is baked and cured at 70-90 ℃, and can share a paint spraying and baking production line with parts (such as skins and bumpers) made of PP, ABS and the like which are common materials in the exterior industry, so that the construction cost of the paint spraying and baking production line is saved, and the investment is reduced by nearly ten million.
Drawings
FIG. 1 is an overall schematic view of an adhesive frame on a plastic back door;
FIG. 2 is a partial schematic view of a bond frame on a plastic back door;
wherein, 1-outer plate, 2-inner plate, 3-frame strip, 4-raised line.
Detailed Description
The following specific examples are merely illustrative of the technical solutions of the present invention and are not intended to limit the scope of the present invention.
In the terms of the present invention, "PP" represents polypropylene, "LGF" represents long glass fiber, "EPDM" represents ethylene-propylene rubber, and "ABS" represents a terpolymer of three monomers of acrylonitrile (A), butadiene (B) and styrene (S).
The low-temperature paint used in the following examples is an acrylic acid-polyurethane system low-temperature paint produced by PPG, the glass cement used is a polyurethane glass cement produced by dow chemical company, and the primer used is a matched primer of the polyurethane glass cement produced by the dow chemical company.
In the invention, the technological process for bonding the plastic back door and the glass specifically comprises the following steps:
injection molding of an outer plate and an inner plate → shielding of frame strips of the outer plate by using a shielding adhesive tape → surface cleaning of non-shielding areas of the outer plate → treatment of outer surfaces → spraying of paint and low-temperature baking → removal of the shielding adhesive tape on the outer plate → surface treatment and adhesion of bonding surfaces of the outer plate and the inner plate → position cleaning of frame strips of the inner plate → surface treatment → primer coating → primer activation → glass cement coating and glass bonding.
Example 1
(1) As shown in fig. 1, an outer plastic back door plate is injection molded by using a PP/EPDM-TD30 material, and an inner plastic back door plate is injection molded by using a PP/LGF40 material; during injection molding, two raised lines with the width of 0.4mm and the height of 0.4mm are designed on the edges of the outer surface close to the inner surface of the outer plate and the inner surface of the inner plate, the area between the two lines is the area coated with primer and glass cement, the area is called as a frame strip, the width of the frame strip is 8mm, and the width of the glass black glaze is 18 mm.
(2) Completely shielding the frame strip area on the surface of the outer plate by using a paper adhesive tape with the width of 10mm so as to ensure that the paint cannot enter the frame strip area when the paint is sprayed on the surface of the outer plate; and cleaning the surface of the unmasked area on the outer plate, performing surface treatment, spraying low-temperature paint, and baking at 70 ℃ until the low-temperature paint is cured.
(3) Tearing off the paper adhesive tape on the frame strips of the outer plate, and bonding the outer plate sprayed with the paint and the inner plate subjected to injection molding together; the raised lines on the outer surfaces of the inner plate and the outer plate are spliced into a quadrangle matched with the edge shape of the glass, the quadrangle is matched with the edge shape of the glass, the frame strips on the inner plate and the outer plate are spliced into a quadrangle bonding frame, and the outer surface of the bonding frame is attached to the inner surface of the black glaze area of the glass.
(4) Cleaning the bonding frame, carrying out flame treatment on the bonding frame, controlling the flame temperature to be 500 ℃, controlling the moving speed to be 500mm/s, carrying out treatment for 10s, then coating a primer on the surface of the bonding frame, and after the primer is solidified, integrally conveying the bonded inner plate and outer plate into an automobile main engine plant.
(5) And coating glass cement on the frame strip area about 10 hours after the primer is coated, aligning the glass with the raised lines, and applying 100N pressure until the glass cement is primarily cured, wherein at room temperature, the glass cement needs 7 days for complete curing.
Example 2
(1) The plastic back door outer plate is formed by injection molding of a PP/EPDM-TD30 material, and the plastic back door inner plate is formed by injection molding of a PP/LGF40 material; during injection molding, two raised lines with the width of 0.3mm and the height of 0.4mm are designed on the edges of the outer surface close to the inner surface of the outer plate and the inner surface of the inner plate, the area between the two lines is the area coated with primer and glass cement, the area is called as a frame strip, the width of the frame strip is 10mm, and the width of the glass black glaze is 20 mm.
(2) Completely shielding the frame strip area on the surface of the outer plate by using a 15mm wide paper adhesive tape so as to ensure that the paint cannot enter the frame strip area when the paint is sprayed on the surface of the outer plate; and cleaning the surface of the unmasked area on the outer plate, performing surface treatment, spraying low-temperature paint, and baking at 90 ℃ until the low-temperature paint is cured.
(3) Tearing off the paper adhesive tape on the frame strips of the outer plate, and bonding the outer plate sprayed with the paint and the inner plate subjected to injection molding together; the raised lines on the outer surfaces of the inner plate and the outer plate are spliced into a quadrangle matched with the edge shape of the glass, the quadrangle is matched with the edge shape of the glass, the frame strips on the inner plate and the outer plate are spliced into a quadrangle bonding frame, and the outer surface of the bonding frame is attached to the inner surface of the black glaze area of the glass.
(4) Cleaning the bonding frame, carrying out flame treatment on the bonding frame, controlling the flame temperature to be 800 ℃, controlling the moving speed to be 800mm/s, treating for 8s, then coating a primer on the surface of the bonding frame, and after the primer is solidified, integrally conveying the bonded inner plate and outer plate into an automobile main engine plant.
(5) After the primer is coated for about 36 hours, a layer of primer is further coated in the area of the frame strip, then glass cement is coated, then the glass is aligned with the raised lines, 120N pressure is applied until the glass cement is primarily cured, and at room temperature, the glass cement needs 7 days for complete curing.
Example 3
(1) The plastic back door outer plate is formed by injection molding of a PP/EPDM-TD30 material, and the plastic back door inner plate is formed by injection molding of a PP/LGF40 material; during injection molding, two raised lines with the width of 0.2mm and the height of 0.3mm are designed on the edges of the outer surface close to the inner surface of the outer plate and the inner surface of the inner plate, the area between the two lines is the area coated with primer and glass cement, the area is called as a frame strip, the width of the frame strip is 18mm, and the width of the glass black glaze is 25 mm.
(2) Completely shielding the frame strip area on the surface of the outer plate by using a 15mm wide paper adhesive tape so as to ensure that the paint cannot enter the frame strip area when the paint is sprayed on the surface of the outer plate; cleaning and surface treating the unmasked area on the outer plate, spraying low-temperature paint, and baking at 80 ℃ until the low-temperature paint is cured;
(3) tearing off the paper adhesive tape on the frame strips of the outer plate, and bonding the outer plate sprayed with the paint and the inner plate subjected to injection molding together; the raised lines on the outer surfaces of the inner plate and the outer plate are spliced into a quadrangle matched with the edge shape of the glass, the quadrangle is matched with the edge shape of the glass, the frame strips on the inner plate and the outer plate are spliced into a quadrangle-shaped bonding frame, and the outer surface of the bonding frame is attached to the inner surface of the black glaze area of the glass;
(4) cleaning the bonding frame, carrying out flame treatment on the bonding frame, controlling the flame temperature to be 1000 ℃, controlling the moving speed to be 1000mm/s, treating for 6s, then coating a primer on the surface of the bonding frame, and after the primer is solidified, integrally conveying the bonded inner plate and outer plate into an automobile main engine plant;
(5) after the primer is coated for about 60 hours, a layer of primer is further coated in the area of the frame strip, then glass cement is coated, then the glass is aligned with the raised lines, 120N pressure is applied until the glass cement is primarily cured, and at room temperature, the glass cement needs 7 days for complete curing.
Example 4
(1) The plastic back door outer plate is formed by injection molding of a PP/EPDM-TD30 material, and the plastic back door inner plate is formed by injection molding of a PP/LGF40 material; during injection molding, two raised lines with the width of 0.2mm and the height of 0.3mm are designed on the edges of the outer surface close to the inner surface of the outer plate and the inner surface of the inner plate, the area between the two lines is the area coated with primer and glass cement, the area is called as a frame strip, the width of the frame strip is 18mm, and the width of the glass black glaze is 25 mm.
(2) Completely shielding the frame strip area on the surface of the outer plate by using a 15mm wide paper adhesive tape so as to ensure that the paint cannot enter the frame strip area when the paint is sprayed on the surface of the outer plate; cleaning and surface treating the unmasked area on the outer plate, spraying low-temperature paint, and baking at 80 ℃ until the low-temperature paint is cured;
(3) tearing off the paper adhesive tape on the frame strips of the outer plate, and bonding the outer plate sprayed with the paint and the inner plate subjected to injection molding together; the raised lines on the outer surfaces of the inner plate and the outer plate are spliced into a quadrangle matched with the edge shape of the glass, the quadrangle is matched with the edge shape of the glass, the frame strips on the inner plate and the outer plate are spliced into a quadrangle-shaped bonding frame, and the outer surface of the bonding frame is attached to the inner surface of the black glaze area of the glass;
(4) cleaning the bonding frame, carrying out plasma treatment on the bonding frame, controlling the moving speed to be 150mm/s for 25s, then coating a primer on the surface of the bonding frame, and after the primer is solidified, integrally conveying the bonded inner plate and outer plate into an automobile host factory;
(5) after the primer is coated for about 100 hours, a layer of primer is coated in the area of the frame strip, then glass cement is coated, then the glass is aligned with the raised lines, 120N pressure is applied until the glass cement is primarily cured, and at room temperature, the glass cement needs 7 days for complete curing.
Example 5
(1) The plastic back door outer plate is formed by injection molding of a PP/EPDM-TD30 material, and the plastic back door inner plate is formed by injection molding of a PP/LGF40 material; during injection molding, two raised lines with the width of 0.2mm and the height of 0.3mm are designed on the edges of the outer surface close to the inner surface of the outer plate and the inner surface of the inner plate, the area between the two lines is the area coated with primer and glass cement, the area is called as a frame strip, the width of the frame strip is 13mm, and the width of the glass black glaze is 26 mm.
(2) Completely shielding the frame strip area on the surface of the outer plate by using a 15mm wide paper adhesive tape so as to ensure that the paint cannot enter the frame strip area when the paint is sprayed on the surface of the outer plate; cleaning and surface treating the unmasked area on the outer plate, spraying low-temperature paint, and baking at 80 ℃ until the low-temperature paint is cured;
(3) tearing off the paper adhesive tape on the frame strips of the outer plate, and bonding the outer plate sprayed with the paint and the inner plate subjected to injection molding together; the raised lines on the outer surfaces of the inner plate and the outer plate are spliced into a quadrangle matched with the edge shape of the glass, the quadrangle is matched with the edge shape of the glass, the frame strips on the inner plate and the outer plate are spliced into a quadrangle-shaped bonding frame, and the outer surface of the bonding frame is attached to the inner surface of the black glaze area of the glass;
(4) cleaning the bonding frame, carrying out plasma treatment on the bonding frame, controlling the moving speed to be 100mm/s for 36s, then coating a primer on the surface of the bonding frame, and after the primer is solidified, integrally conveying the bonded inner plate and outer plate into an automobile host factory;
(5) coating a layer of primer on the bonding frame about 100 hours after the primer is coated, coating glass cement, aligning the glass with the raised lines, applying 120N pressure until the glass cement is primarily cured, and completely curing the glass cement at room temperature for 7 days.
Example 6: shear test
The same glass glue as in examples 1-5 was used to bond the surfaces of the inner and outer plate samples with a length, width, and height of 300mm, 25mm, and 3mm, and the bonding area was 12.5mm, 25mm, and after curing, a shear test was performed, and it was found that when the room temperature shear strength after the glass glue was bonded to the inner plate sample was much greater than the room temperature shear strength after the glass glue was bonded to the outer plate sample: the normal-temperature shear strength of the glass cement bonded with the outer plate sample piece is 3-4MPa, and the normal-temperature shear strength of the glass cement bonded with the inner plate sample piece is 5-6MPa, so that the bonding strength of the glass and the plastic back door can be greatly improved by simultaneously bonding the outer plate and the inner plate with the glass.
Example 7: knife cutting experiment
Preparing an inner plate sample sheet and an outer plate sample sheet with the length, width, height, 300mm, 100mm and 3mm, respectively coating the same glass cement as in examples 1-5 on the surfaces of the inner plate sample sheet and the outer plate sample sheet, pressing into a rubber strip with the length, 10 and 5mm, curing, and then cutting the rubber strip by a knife, wherein the test result requires that the area rate of a rubber layer failure mode is equal to or more than 70% of cohesive failure of the rubber; each minor piece of tape failed to fail < 50% cohesive failure of the adhesive, with 100% cohesive failure being the best result; from the knife cut test failure mode, the bonding effect of the inner plate and the glass cement is better than that of the outer plate.
Table 1 is the proportion of failure after the inner plate sample and the outer plate sample are cut with a knife under different conditions, the failure proportion of the whole outer plate sample is greater than that of the inner plate sample: the outer plate template failed by 96.8% cohesion and failed by 3.2%; the inner panel coupon failed 100% cohesively without failure.
TABLE 1 proportion of failure of inner and outer plate templates after knife cutting under different conditions
Serial number Test conditions of parts Failure mode and area ratio of outer plate glue layer Failure mode and area ratio of inner plate glue layer
1 Cutting at normal temperature 96.8% cohesive failure, 3.2% failure 100% cohesive failure
2 Knife cutting after damp heat aging 85.9% cohesive failure, 14.1% failure 99.5% cohesive failure, 0.5% failure
3 Knife cutting after heat aging 92.6% cohesive failure, 7.4% failure 100% cohesive failure
4 H7 cutter cutting after aging 83.9% cohesive failure, 16.1% failure 99.1% cohesive failure, 0.9% failure
The invention improves the bonding process of the plastic back door and the glass, the outer plate of the plastic back door uses low-temperature paint, and the outer plate and the inner plate are bonded with glass glue, thereby not only meeting the design requirement of complex molded surfaces, but also improving the bonding performance of the glass and the plastic back door. The outer plate is sprayed with paint and then is baked and cured at 70-90 ℃, and can share a paint spraying and baking production line with parts (such as skins and bumpers) made of PP, ABS and the like which are common materials in the exterior industry, so that the construction cost of the paint spraying and baking production line is saved, and the investment is reduced by nearly ten million.
The above embodiments are merely for clearly illustrating the embodiments and are not intended to limit the embodiments. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessary or exhaustive for all embodiments, and are therefore within the scope of the invention.

Claims (10)

1. A process improvement method for bonding a plastic back door and glass is characterized by comprising the following steps:
(1) manufacturing an inner plate and an outer plate of the plastic back door by an injection molding method, wherein frame strips for bonding glass are arranged at the edges of the inner plate and the outer plate of the plastic back door close to the edges, and after the inner plate and the outer plate are aligned, the frame strips of the inner plate and the outer plate are spliced into a bonding frame matched with the edge shape of the glass;
(2) shielding the frame strips on the outer plate by using a shielding adhesive tape, spraying low-temperature paint on the outer surface of the outer plate, baking at 70-90 ℃ after the paint is sprayed until the low-temperature paint is completely cured, and removing the shielding adhesive tape;
(3) the inner plate and the outer plate are bonded in an aligned mode, and the frame strips of the inner plate and the outer plate are spliced into a bonding frame;
(4) and carrying out surface treatment on the bonding frame to bond the glass on the bonding frame.
2. The improved process for bonding a plastic back door to glass as claimed in claim 1, wherein: the outer surfaces of the inner plate and the outer plate are respectively provided with two parallel raised lines close to the edges, and the frame strips are positioned between the two parallel raised lines.
3. The improved process for bonding a plastic back door to glass as claimed in claim 2, wherein: the width of the convex line is less than 0.5mm, the height of the convex line is less than 0.5mm, and the convex line can be plaited by naked eyes.
4. The improved process for bonding a plastic back door to glass as claimed in claim 1, wherein: the bonding frame is a rectangular frame.
5. The improved process for bonding a plastic back door to glass as claimed in claim 4, wherein: the upper side and the lower side of the bonding frame are outer plate frame strips, and the left side and the right side of the bonding frame are inner plate frame strips.
6. The improved process for bonding a plastic back door to glass as claimed in claim 1, wherein: the surface treatment means is flame burning or plasma treatment.
7. The improved process for bonding a plastic back door to glass as claimed in claim 1, wherein: in the step (4), after the surface treatment is carried out on the bonding frame, a primer is coated; (i) coating glass cement in 24h, or (ii) coating primer again within 1-7 days and then coating the glass cement; and bonding the glass on the bonding frame.
8. The improved process for bonding a plastic back door to glass as claimed in claim 1, wherein: the outer plate is made of PP/EPDM composite material, and the inner plate is made of PP/LGF composite material.
9. The improved process for bonding a plastic back door to glass as claimed in claim 1, wherein: the shielding adhesive tape is a high-temperature resistant adhesive tape, and no residue is left on the frame strip after the shielding adhesive tape is torn off.
10. The improved process for bonding a plastic back door to glass as claimed in claim 1, wherein: the frame strip width is 8 ~ 25 mm.
CN202010064596.7A 2020-01-20 2020-01-20 Technological improvement method for bonding plastic back door and glass Active CN111171732B (en)

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CN106015231B (en) * 2016-07-29 2018-08-07 奇瑞新能源汽车技术有限公司 Board connecting structure and connection method inside and outside a kind of automotive back door
CN108790203A (en) * 2017-12-31 2018-11-13 芜湖恒信汽车内饰制造有限公司 A kind of production method of plastics rear tailgate
CN208439037U (en) * 2018-03-22 2019-01-29 绿驰汽车科技（上海）有限公司 A kind of laser assembly solder back door inner panel and back door
JP6927928B2 (en) * 2018-06-29 2021-09-01 ダイハツ工業株式会社 Adhesion method for resin exterior members

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