WO2021142921A1

WO2021142921A1 - Online thermal bonding process for flocking tape of automobile epdm glass guide groove sealing strip

Info

Publication number: WO2021142921A1
Application number: PCT/CN2020/080163
Authority: WO
Inventors: 陈正林
Original assignee: 陈正林
Priority date: 2020-01-19
Filing date: 2020-03-19
Publication date: 2021-07-22
Also published as: CN111231357A

Abstract

An online thermal bonding process for flocking tape of an automobile EPDM glass guide groove sealing strip: a produced EPDM sealing strip is vulcanized or cured and then a flocking tape is thermally bonded, and the temperature of the EPDM sealing strip after vulcanization or curing is used to hot-melt and bond the flocking tape, which not only uses waste heat that is advantageous to environmental protection and energy saving, but also implements online bonding during the production process of an EPDM sealing strip, reduces the cumbersome processes of subsequent flocking, saves on process procedures, and reduces the costs. At the same time, when the EPDM sealing strip produced by the thermal bonding process is compared to an EPDM sealing strip produced by traditional electrostatic flocking, the EPDM sealing strip produced by the thermal bonding process has a better flocking effect and more uniform fluff coverage, thus reducing the possibility of increased friction with glass during use due to uneven flocking, and reducing the noise of automobile glass during a lifting process.

Description

On-line thermal bonding process for sealing strip flocking tape of automobile EPDM glass guide groove

Cross-references to related applications

This application claims the priority of the Chinese patent application submitted to the Chinese Patent Office on January 19, 2020, the application number is 2020100594344, and the invention title is "Automotive EPDM Glass Channel Sealing Strip Flocking Tape Online Thermal Bonding Process", all of which The content is incorporated in this application by reference.

Technical field

The invention belongs to the technical field of automobile sealing strip flocking, in particular to an on-line thermal bonding process for automobile EPDM glass guide groove sealing strip flocking tape.

Background technique

The current sealing strip is made of EPDM material, and the Chinese name is EPDM. EPDM rubber is a terpolymer of ethylene, propylene and non-conjugated diene. The most important feature of EPDM is its superior resistance to oxidation, ozone and corrosion. Since EPDM belongs to the polyolefin (PO) family, it has excellent vulcanization characteristics. Among all rubbers, EPDM has the lowest specific gravity and can absorb a large amount of fillers and oils without much influence on the characteristics, so it can produce low-cost rubber compounds.

The main polymer chain of EPDM is fully saturated. This feature makes EPDM resistant to heat, light, oxygen, and especially ozone. EPDM is essentially non-polar, has resistance to polar solutions and chemicals, has low water absorption, and has good insulation properties.

Therefore, it can be widely used in automotive parts, waterproof materials for construction, wire and cable sheaths, heat-resistant hoses, tapes, automotive seals and other fields.

However, in the production of automobile sealing strips such as glass guide grooves and water cut strips, it is necessary to flock or paste flock on the contact surface of the sealing strip and the glass to reduce the friction and noise of the glass lifting and improve the sealing and comfort of the car. The prior art adopts online electrostatic flocking or off-line electrostatic flocking process for production. There are two main types:

1. On-line electrostatic flocking. The disadvantage is that the existing seal factory uses oily flocking glue for on-line electrostatic flocking. There is no water-based glue on the market that can meet the requirements, so there are many toxic and harmful substances on the construction site and it is not environmentally friendly. , And the current flocking process is also complicated, especially when part of the cross-section shape is curved, there are often phenomena such as glue leakage, resulting in large scraps.

2. PE tape lamination + online electrostatic flocking. The disadvantage is that PE tape can only be attached to the bottom edge, not the lip edge. The bottom edge and the lip edge need to be combined with two processes, which is more cumbersome. At the same time, the PE tape Although the abrasion resistance is good, it is not resistant to high temperature, and the sealing effect is not good, which is easy to cause abnormal noise of the glass lifting.

Therefore, there is a need for a more environmentally friendly and easy-to-produce sealing strip flocking process, which can reduce costs and improve the flocking effect.

Summary of the invention

1. The technical problem to be solved by the invention

The purpose of the present invention is to solve the problems of poor flocking effect of the existing EPDM sealing strip flocking process, complicated process, and insufficient environmental protection.

2. Technical solution

In order to achieve the above objective, the technical solution provided by the present invention is as follows:

The present invention provides an on-line heat bonding process for the flocking tape of the automotive EPDM glass guide groove sealing strip, and the produced EPDM sealing strip is vulcanized or cured, and then the flocking tape is thermally bonded.

Preferably, it includes the following steps:

Step 1. Forming, extruding the raw material of EPDM sealing strip into a high-temperature die to obtain EPDM sealing strip;

Step 2: Vulcanize or cure, vulcanize or cure the EPDM sealing strip obtained by extrusion molding;

Step three, bonding, heat bonding the flocking tape with the vulcanized or cured EPDM sealing strip.

Preferably, the first step is specifically heating and melting the EPDM sealing strip rubber material and then extruding it through a die to obtain a soft EPDM sealing strip with a shape.

Preferably, the second step is specifically that the soft EPDM sealing strip obtained by extrusion molding is subjected to heating vulcanization or heating curing to obtain the required EPDM sealing strip with hardness and resilience.

Preferably, the step 3 is specifically that the flocking tape is thermally fused and bonded to the surface of the EPDM sealing strip with hardness and resilience by using the vulcanization residual heat after vulcanization or the curing residual heat after curing, to obtain the EPDM with flocking surface sealing strip.

Preferably, the vulcanization in the second step is specifically to increase the hardness and elasticity of the soft EPDM sealing strip by heating and vulcanization, and the heating temperature of the vulcanization is 120 to 350°C; the curing in the second step is specifically to increase the softness by heating and curing. For the hardness and elasticity of the flexible EPDM sealing strip, the curing heating temperature is 120-350°C.

Preferably, the hot-melt bonding in the step 3 specifically involves pulling and pressing the flocking tape on the surface of the EPDM sealing strip, and the flocking tape is heated by the vulcanization waste heat of the EPDM sealing strip or cured by the EPDM sealing strip. After heating, the adhesive of flocking tape melts and adheres to the surface of EPDM sealing strip.

Preferably, the temperature at which the flocking tape in the third step is hot-melt bonded using the vulcanization waste heat after vulcanization is 80-290°C; the flocking tape in the third step is hot-melt bonded using the cured waste heat after curing. The combined temperature is 80 to 290°C.

Preferably, the bonding speed of the thermal bonding process is 1 m/min to 35 m/min.

Preferably, when the vulcanized EPDM sealing strip and the flocking tape are thermally bonded, pressure is applied to the bonding surface of the EPDM sealing strip and the flocking tape, and the pressure range is 1.5-28N.

3. Beneficial effects

Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

The present invention provides an on-line thermal bonding process for flocking tape of automotive EPDM glass guide groove sealing strips. The produced EPDM sealing strips are vulcanized or cured, and then the flocking tapes are thermally bonded, and the EPDM sealing strips are self-contained after vulcanization or curing. The flocking tape is hot-melted and bonded at a temperature that is beneficial to environmental protection and energy saving, and it also realizes online bonding during the production of EPDM sealing strips, which reduces the cumbersome process of subsequent flocking and saves process procedures. For example, the power consumption of the curing box reduces the cost. At the same time, the EPDM sealing strip produced by the thermal bonding process is better than the EPDM sealing strip produced by the traditional electrostatic flocking. The EPDM sealing strip produced by the thermal bonding process has a better flocking effect and more fluff coverage. Uniformity, which reduces the possibility of increased friction with the glass due to uneven flocking during use, and reduces the noise of the car glass during lifting.

Description of the drawings

Fig. 1 is a flow chart of an on-line thermal bonding process for sealing strip flocking tape of automotive EPDM glass channel of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the application, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only These are a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

It should be noted that the terms "first" and "second" in the specification and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances for the purposes of the embodiments of the present application described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientation or positional relationship indicated by "vertical", "horizontal", "horizontal", "longitudinal" and the like is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element, or component must have a specific orientation, or be constructed and operated in a specific orientation.

In addition, some of the aforementioned terms may be used to indicate other meanings in addition to the orientation or position relationship. For example, the term "shang" may also be used to indicate a certain dependency relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

In addition, the terms "installed", "set", "provided", "connected", "connected", and "socketed" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediary, or between two devices, elements, or components. Connectivity within the room. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the application will be described in detail with reference to the drawings and in conjunction with the embodiments.

Example 1

With reference to Figure 1, an on-line heat bonding process for flocking tape of automotive EPDM glass guide groove sealing strips of this embodiment is to vulcanize or cure the produced EPDM sealing strips and then perform flocking tape thermal bonding, using vulcanization or curing After the EPDM sealing strip comes with the temperature, the flocking tape is hot-melted and bonded, which not only uses the waste heat that is beneficial to environmental protection and energy saving, but also realizes the online bonding in the production process of the EPDM sealing strip, reducing the cumbersome follow-up flocking The process saves the process steps and reduces the cost. At the same time, the EPDM sealing strip produced by the thermal bonding process is better than the EPDM sealing strip produced by the traditional electrostatic flocking. The EPDM sealing strip produced by the thermal bonding process has a better flocking effect and more fluff coverage. Uniformity, which reduces the possibility of increased friction with the glass due to uneven flocking during use, and reduces the noise of the car glass during lifting. In the process of use, the harmful VOC and harmful irritating gas content of the EPDM sealing strip in the car is reduced.

The process of this embodiment includes the following steps:

Among them, the first step is specifically heating and melting the EPDM sealing strip rubber material and then extruding it through a die to obtain a soft EPDM sealing strip with a shape.

Among them, the second step is specifically to heat vulcanize or heat cure the soft EPDM sealing strip obtained by extrusion to obtain the required hardness and resilience EPDM sealing strip. The vulcanization is specifically to improve the soft EPDM sealing strip by heating and vulcanizing. Hardness and elasticity, the heating temperature of the vulcanization is 120-350°C, 250°C is preferred in this embodiment, and the linear macromolecules in the soft EPDM seal strip transform into three-dimensional at a temperature of 250°C The net-like structure makes the soft EPDM sealing strip gradually harder, while the elasticity also gradually increases, and finally an EPDM sealing strip with hardness and resilience is obtained. Curing specifically refers to improving the hardness and elasticity of the soft EPDM sealing strip by heating and curing.

The heating temperature for curing in this embodiment is 120-350°C, and 250°C is preferred in this embodiment. During the curing process, the linear macromolecules in the soft EPDM sealing strip transform into a three-dimensional network structure, making the soft EPDM sealing strip It gradually becomes harder, while the elasticity also gradually rises, and finally an EPDM sealing strip with hardness and resilience is obtained. Curing specifically refers to improving the hardness and elasticity of the soft EPDM sealing strip by heating and curing.

Step 3 of this embodiment is specifically to use the vulcanization waste heat after vulcanization or the curing waste heat after curing to heat-melt and bond the flocking tape to the surface of the EPDM sealing strip with hardness and resilience to obtain an EPDM seal with a flocked surface Hot-melt bonding specifically refers to pulling and pressing the flocking tape on the surface of the EPDM sealing strip. The flocking tape is heated by the vulcanization waste heat after the EPDM sealing strip is cured or is heated by the curing waste heat after the EPDM sealing strip is cured, flocking The adhesive of the belt is melted by heat and adheres to the surface of the EPDM sealing strip. The flocking belt uses the vulcanization waste heat after vulcanization for thermal fusion bonding at a temperature of 80 to 290°C, and the flocking belt uses the solidification waste heat after curing for thermal fusion. The temperature of bonding is 80 to 290°C.

The bonding speed of the thermal bonding process in this embodiment is 1m/min～35m/min. When the bonding speed is too fast, the back glue of the flocking tape is not completely combined with the EPDM sealing strip and the bonding is completed. The bonding effect is not good. When the bonding speed is too low, the temperature of the EPDM sealing strip after vulcanization or curing will not be bonded due to the slow bonding speed and the temperature will decrease during bonding, making the back glue of the flocking tape not better The thermal melting of the flocking belt causes the flocking belt and the flocking belt to not be closely combined, and the effect cannot be achieved.

When the vulcanized EPDM sealing strip and the flocking tape of this embodiment are thermally bonded, pressure is applied to the bonding surface of the EPDM sealing strip and the flocking tape, and the pressure is in the range of 1.5-28N.

In this embodiment, when the vulcanized or cured EPDM sealing strip is in contact with the flocking tape, since the EPDM sealing strip is heated to 250°C during the vulcanization or curing process, the heat of the EPDM sealing strip will be transferred to the flocking tape And the temperature of the flocking tape is increased to 200℃. At this time, the back glue of the flocking tape is heated and melted into a molten state. The back glue in the molten state is pressed on the bonding surface, and the back glue in the molten state is squeezed by the pressure. The glue fully contacts the surface of the EPDM sealing strip, filling the gap between the flocking tape and the EPDM sealing strip and bonding, the flocking tape and the EPDM sealing strip are more firm, and the flocking tape of the EPDM sealing strip The bonding is more uniform, and the EPDM sealing strip will not cause noise due to the uneven bonding of the flocking tape to the flocking surface and the car glass during use.

At the same time, the bonding speed of this embodiment is preferably 15m/min, so that the flocking tape and EPDM sealing strip will not be tightly combined with the EPDM sealing strip due to the excessively fast bonding speed during the production process. If the bonding speed is too slow, the temperature of the flocking tape and the EPDM sealing strip will decrease, and the bonding of the flocking tape and the EPDM sealing strip will be unstable.

The above-mentioned embodiments only express a certain embodiment of the present invention. The description is more specific and detailed, but it should not be construed as a limitation on the scope of the present invention; it should be pointed out that for those of ordinary skill in the art, In other words, without departing from the concept of the present invention, several modifications and improvements can be made, which belong to the scope of protection of the present invention; therefore, the scope of protection of the patent of the present invention shall be subject to the appended claims.

Claims

An on-line thermal bonding process for flocking tapes of automotive EPDM glass guide groove sealing strips is characterized in that the produced EPDM sealing strips are vulcanized or cured and then the flocking tapes are thermally bonded.
According to claim 1, an on-line thermal bonding process for sealing strip flocking tape of automotive EPDM glass guide groove, characterized in that it comprises the following steps:

Step 1. Forming, extruding the raw material of EPDM sealing strip into a high-temperature die to obtain EPDM sealing strip;

Step 2: Vulcanize or cure, vulcanize or cure the EPDM sealing strip obtained by extrusion molding;

Step three, bonding, heat bonding the flocking tape with the vulcanized or cured EPDM sealing strip.
The on-line heat bonding process for automotive EPDM glass guide groove sealing strip flocking tape according to claim 2, characterized in that: the first step is specifically heating and melting the EPDM sealing strip EPDM rubber material and extruding it through a die Molded to obtain a soft EPDM sealing strip with a shape.
The on-line heat bonding process for automotive EPDM glass guide groove sealing strip flocking tape according to claim 2, characterized in that: the second step is specifically heating and vulcanizing the soft EPDM sealing strip obtained by extrusion molding or After heating and curing, the required EPDM sealing strip with hardness and resilience is obtained.
The on-line thermal bonding process for the flocking tape of the automotive EPDM glass guide groove sealing strip according to claim 2, characterized in that: the step three is specifically using the flocking tape to use vulcanization waste heat after vulcanization or curing after curing. The waste heat is hot-melt bonded to the surface of the EPDM sealing strip with hardness and resilience to obtain the EPDM sealing strip with flocking surface.
According to claim 4, an on-line heat bonding process for the flocking tape of automotive EPDM glass guide groove sealing strips, characterized in that: the vulcanization of the second step is specifically to increase the hardness and elasticity of the soft EPDM sealing strips by heating and vulcanizing The heating temperature of the vulcanization is 120-350°C; the curing in the second step is specifically to increase the hardness and elasticity of the soft EPDM sealing strip by heating and curing, and the heating temperature of the curing is 120-350°C.
According to claim 5, an on-line thermal bonding process for flocking tape of automotive EPDM glass guide groove sealing strips, characterized in that: the hot-melt bonding in step 3 specifically involves pulling and pressing the flocking tape on On the surface of the EPDM sealing strip, the flocking tape is heated by the vulcanization residual heat of the EPDM sealing strip or by the curing residual heat after the EPDM sealing strip is cured. The back glue of the flocking tape is heated to melt and adhere to the surface of the EPDM sealing strip.
According to claim 5, an automotive EPDM glass channel sealing strip flocking tape on-line thermal bonding process, characterized in that: the flocking tape in the third step uses the vulcanization waste heat after vulcanization for thermal fusion bonding The temperature is 80-290°C; the temperature of the flocking tape in the third step is 80-290°C for hot-melt bonding using the solidified waste heat after curing.
The on-line thermal bonding process for automotive EPDM glass channel sealing strip flocking tape according to any one of claims 1-8, characterized in that: the bonding speed of the thermal bonding process is 1m/min～35m /min.
An on-line heat bonding process for automotive EPDM glass guide groove sealing strip flocking tape according to claim 9, characterized in that: when the vulcanized EPDM sealing strip and flocking tape are thermally bonded, the EPDM sealing strip and the flocking tape are thermally bonded together. The bonding surface of the flocking belt is under pressure, and the pressure is in the range of 1.5-28N.