KR20130104624A - Plastic glazing having blackout coating for vehicle glass - Google Patents

Abstract

PURPOSE: A plastic glazing is provided to secure adhesive property between the plastic glazing and car body, and to improve the weatherproof and intensity. CONSTITUTION: A blackout coated plastic glazing for car windows comprises: a transparent plastic substrate (100) consisting of polycarbonate resin; a coating layer (110) formed in the front of the transparent plastic substrate to increase the weatherproof and intensity; and a black ceramic painting layer (130) formed on the coating layer and arranged along the edge of the transparent plastic substrate. The coating layer is organic-inorganic hybrid silica.

Description

Plastic glazing having blackout coating for vehicle glass

The present invention is an organic and inorganic hybrid silica coating layer formed on a polycarbonate that is lighter, easier to handle, and exhibits excellent mechanical performance than conventional glass, and has blackout coating for automotive glass which can improve weather resistance and strength. Relates to plastic glazing.

In order to replace existing window glass with lightweight plastic glass, material development, molding technology, and surface coating technology that satisfy the strength and scratch resistance of the replacement material are required.

Safety glass with a plastic film inserted between the existing glass, such as HPR (High Penetration Resistace) glass used in the windshield of the vehicle, is a safety glass that sandwiches a plastic film between inorganic plate glass and absorbs the impact in the event of a collision. It is increasing the safety to protect the occupant's head.

If it is possible to maintain the same strength as the body, and not be broken, and to be lightweight, it is expected to contribute to the development of automotive parts quality by increasing the productivity and reducing the manufacturing cost by using technologies such as IMC coating or FIM film forming.

At present, the windshield of automobile is about 3 ~ 4㎡ and weighs about 30 ~ 35kg. In order to reduce the weight of automobile windshield, sunroof, and lamp with plastic materials, it is necessary to assume the condition that the safety of occupants is secured. Light weight should be achieved to secure and improve more advanced safety.

Just as the body parts are replaced with plastics, the roof area can be replaced by high-performance sheet glass rather than steel plates, contributing to lighter cars and improved fuel economy.

Plastic materials have contributed to the weight reduction of automobiles, the freedom of design and design, the provision of new functions, and the reduction of costs. It was necessary to develop parts that were difficult.

Particularly in automobiles, environmental and energy-responsive technologies focus on reducing the emissions of nitrogen dioxide, improving fuel efficiency, and recycling used materials. The solution to these problems is plastic and its composite materials. We put great expectation on use promotion.

Lightweight, new molding is a problem faced by the automotive industry that pressure on cost reduction is high due to the recent reduction of fuel economy and environmental regulations, efforts to secure passenger safety, and intensifying competition among automakers. In order to cope with technology, the necessity of replacing parts occupied by soft steel sheets with light metals, plastics, and carbon composites is increasing.

Polycarbonate is widely used as a plastic glazing material because of its excellent impact resistance, transparency, and moldability, but is poor in scratch resistance and abrasion resistance, and thus scratch resistance through surface treatment techniques such as polysiloxane hard coating or plasma assisted deposition It needs to be supplemented.

Surface treatment techniques that provide scratch resistance to polycarbonates known to date include a method of coating a polysiloxane hard coating agent on the surface of a polycarbonate, a method of blending a polycarbonate and a high scratch resistant polymer, and a silicon using plasma And a method of chemically depositing a dioxide and a method of inserting a film having scratch resistance into a mold and injection molding.

In U.S. Pat. The present invention describes a coating method of a polycarbonate product having excellent scratch resistance and adhesion by applying an acrylic resin having a thermosetting polysiloxane containing and having a functional group as a primer layer inserted between a polycarbonate layer and a surface layer. US Patent No. 5,156,882 discloses a method for manufacturing a transparent polycarbonate product having UV protection and abrasion resistance by inserting a layer capable of increasing the adhesion between the ultraviolet absorbing layer containing titanium dioxide and silicon dioxide during the plasma assist deposition into an intermediate layer. It is described. In addition, U.S. Patent No. 5,916,980 discloses a method of preparing a polycarbonate resin composition having scratch resistance by grafting a polysiloxane structure to a polycarbonate resin, followed by blending 0-20 wt% of polysiloxane to the resin. to provide.

US Pat. Nos. 5,227,457, 5,976,437, 6,087,467 and the like describe methods for synthesizing, modifying, and copolymerizing polybenzoylparaphenylene having a very rigid molecular structure. Polybenzoylparaphenylene has excellent hardness, scratch resistance, mechanical properties, etc. due to its rigid molecular structure, but it is difficult to be melted by heat and difficult to melt by heat. Therefore, since the processing is very difficult, a method for synthesizing modified polybenzoylparaphenylene which is easier to process by introducing a group which is easy to dissolve in the paraphenylene repeating structure is provided.

Lastly, Korean Patent Application No. 2003-7011788 describes a method having superior optical properties by inserting a polycarbonate film coated with scratches into a mold and then injecting polycarbonate to attach the polycarbonate film.

However, the plastic glazing as described above has a problem in that the adhesion between the vehicle body and the plastic glazing is inferior, and it is urgent to develop a technology capable of securing the adhesion between the vehicle body and the plastic glazing.

In addition, since the plastic glazing is made of only a transparent plate, the aesthetics are inferior, and accordingly, there is a demand for technology development to further increase the commerciality.

The present invention has been made to solve the above-described problems, and the object of the present invention is to provide a plastic glazing for automotive glass with a blackout coating that can secure the adhesion between the vehicle body and the plastic glazing, and can increase the commercial property. have.

The present invention is a transparent plastic substrate made of a polycarbonate resin; A coating layer formed on the front surface of the transparent plastic substrate to improve weather resistance and strength; and a black ceramic painting layer formed on the coating layer and disposed along an edge of the transparent plastic substrate. To provide plastic glazing.

In the present invention, the coating layer is an organic, inorganic hybrid silica (hybrid slica) provides a black glazed coated plastic glazing for automotive glass.

According to the plastic glazing for automotive glass treated with the blackout coating of the present invention, the following effects are obtained.

Compared to the glass used in the past, light and easy to handle, the organic and inorganic hybrid silica coating layer is formed on the polycarbonate showing excellent mechanical performance can improve the weather resistance and strength.

Furthermore, the black ceramic painting layer may be blacked out, thereby securing adhesion between the vehicle body and the plastic glazing and increasing the commercial property.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a plastic glazing injection compression molding apparatus for an automobile according to a preferred embodiment of the present invention; Fig.
2 is a partial cross-sectional view showing the gate opening / closing means shown in Fig. 1;
3 is a flow chart illustrating a method of injection molding a plastic glaze for automotive glass according to a preferred embodiment of the present invention.
4 is a perspective view showing plastic glazing for a black-out coated automobile glass according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1, the plastic glaze injection compression molding apparatus for an automobile according to the preferred embodiment of the present invention includes an upper mold 10 and a lower mold 20, an injection flow path 30, 40, power means 50, power transmission means 60, and gate opening / closing means 70.

The upper mold 10 and the lower mold 20 are arranged to face each other and grooves are formed to insert the upper core 11 and the compression core 40 for injection molding respectively.

The upper core 11 is disposed on the upper mold 10 and the compression core 40 is disposed on the lower mold 20. In contrast to this, the upper core 10 is provided with the compression core 40 And the lower core 20 may be disposed on the lower mold 20. [

The injection flow path 30 is formed in order to inject molten resin into the upper mold 10 and the lower mold 20. In this embodiment the injection flow path 30 is formed between the upper core 11 and the compression core 40 A gate 31 of the injection path 30 is formed on one side of the injection mold 30. The injection path 30 extends from the gate 31 to between the upper mold 10 and the lower mold 20, And the upper mold 10 side. It goes without saying that the shape and arrangement of the injection path 30 may vary depending on the embodiment.

1, the upper core 11 disposed on the upper mold 10 is fixed to the upper mold 10, and the compressed core 40 disposed on the lower mold 20 is fixed to the upper mold 10, And is provided in the lower mold 20 so that the entire area of the resin can be linearly reciprocated in a direction perpendicular to the entire area of the molten resin so as to be applied with a uniform pressure.

A first guide block 41 for guiding the linear reciprocating motion of the compression core 40 is provided along the outer circumferential surface of the compression core 40. The first guide block 41 is provided along the outer peripheral surface of the first guide block 41, 2 guide block 42 is provided. Preferably, the first guide block 41 is made of oilless metal, and the second guide block 42 is made of an alloy steel.

The power means 50 is provided on the outer side of the upper mold 10 and preferably provides a power for the compression core 40 to move linearly, and is preferably an inlet cylinder. Reference numeral 51 in Fig. 1 denotes a hydraulic cylinder supporting block for supporting the hydraulic cylinder. Reference numeral 53 denotes a connecting block which is connected to the hydraulic cylinder and moves together with the piston when the piston of the hydraulic cylinder operates. One end of the link member 65 to be explained is rotatably connected.

The power transmission means 60 preferably transmits the power of the power means 50 to the compression core 40 and includes a compression force transmission block 61, a link member 65 and a link support block 66.

One end of the compression force transfer block 61 contacts the compression core 40 to transmit the compression force to the compression core 40. The first block 62 receives a frictional force at a portion contacting the compression core 40 in the compression force transfer block 61.

One end of the link member 65 is rotatably connected to a connecting block 53 connected to the hydraulic cylinder and the other end is rotatably connected to the compression force transfer block 61 so that the rotational force of the hydraulic cylinder during the operation of the hydraulic cylinder, To the transfer block (61).

As described above, in order for the link member 65 to transmit the force to the lever principle, the link supporting block 66 is provided at the lower portion of the link member 65 so as to support the other end of the link member 65 toward the compression- Lt; / RTI >

Reference numeral 67 in FIG. 1 denotes a second block 67 for guiding the movement of the link support block 66 to operate the power generated from the power means 50 by a compression force, The second block 68 receives the frictional force in the process of amplifying the power, and the reference numeral 69 is the fourth block 69 for improving the assemblability.

The link members 65 described above are provided with two spaced apart from each other, and thus two compression power transfer blocks 61, link support blocks 66 and power means 50 are provided.

The pressure of the hydraulic cylinder is proportional to the pressure required when the entire area of the molten resin is applied by the link member 65 that transmits the rotational force of the hydraulic cylinder to the compression force transfer block 61 in the lever principle during the operation of the hydraulic cylinder .

That is, even with a relatively small force, a large compressive force can be applied to the entire area of the molten resin, thereby increasing the efficiency.

In order to suppress the amount of wear and scratches due to the frictional heat generated as the process of converting the rotational force of the link member 65 into the compressive force is continuously performed, it is preferable to perform heat treatment on all members in which frictional force is generated.

On the other hand, the gate opening and closing means 70 is provided as shown in Figure 2 to open or close the gate 31 of the injection passage 30, the gate opening and closing means 70 is the opening and closing block 71 and the moving means 75 It is preferable to include).

The opening and closing block 71 is provided so as to be capable of linear reciprocation so as to open and close the gate 31 which is an inlet through which the molten resin enters the upper mold 10 and the lower mold 20 through the injection flow path 30. In this embodiment, the opening / closing block 71 is provided in the lower mold 20 and may be provided in the upper mold 10 according to the embodiment.

The moving means 75 for moving the opening / closing block 71 includes a hydraulic cylinder 76, a connecting block 77 and a guiding block 78.

The hydraulic cylinder 76 provides power and the connecting block 77 connects the hydraulic cylinder 76 and the opening and closing block 71 to transmit the power of the hydraulic cylinder 76 to the opening and closing block 71, A guide block 78 is provided outside the connection block 77 to guide the movement of the guide block 77.

It is preferable to heat-treat the guide block 78 to suppress the amount of wear due to frictional heat and the occurrence of scratches as the connection block 77 continues to operate.

It is preferable that a temperature sensor (not shown) is installed so that the opening and closing block 71 can smoothly operate. It is preferable to control the opening and closing block 71 so as to have a temperature deviation of 5 ° C from the guide block 78 Do.

Closing block 71 closes the gate 31 when the compression core 40 applies a pressure to the entire area of the molten resin by the gate opening / closing means 70 constructed as described above, so that the molten resin flows into the gate 31 To the side of the injection flow path 30, so that the pressure loss can be prevented from occurring.

According to the above-described plastic glaze injection compression molding apparatus for an automobile glass, when the charging of the molten resin through the injection channel 30 is completed, the gate opening / closing means 70 closes the gate 31 in the primary operation, Thereby preventing the molten resin from flowing back from the gate 31 side to the injection flow path 30 side.

After the resin filling is completed, the gate 31 is closed by the primary operation, and then the uniform pressure is applied to the entire area of the molten resin by the secondary operation in the compression core 40, It is possible to improve the quality by improving the shrinkage deviation and to improve the phenomenon (rainbow) which is prominent in the transparent product group, so that the stable quality of the molded product can be secured.

Hereinafter, the injection compression molding method using the plastic glazing injection compression molding apparatus for an automobile according to the present invention constructed as described above may be performed as follows.

Referring to Fig. 3, the mold is closed. That is, the upper mold 10 and the lower mold 20 are closed. The time for closing the upper mold 10 and the lower mold 20 is about 15 seconds.

Then, the molten resin is charged through the injection path 30 into the mold. (Step S1) The time for charging the molten resin is 8 seconds to 12 seconds.

When the molten resin is completely filled in the molten mold, the gate 31 of the injection flow path 30 is shut off. (Step S2). That is, the hydraulic cylinder 76 is operated to move the opening / closing block 71 so as to close the gate 31 of the injection flow path 30. The time for blocking the gate 31 is about 3 seconds.

Then, a uniform pressure is applied to the entire area of the molten resin to be compressed. The power of the power means 50 is transmitted to the link member 65 so that the power is converted into the rotational force and the rotation of the link member 65 and the rotation of the link support block 66, the rotational force is converted into a compressive force and transmitted to the compressive force transfer block 61 by the lever principle. The compression force of the compression force transmitting member is transmitted to the compression core 40 so that the compression core 40 applies a uniform pressure to the entire area of the molten resin so that the molten resin is compressed.

At this stage, it is preferable to apply a compression force of 200 to 300 kgf / cm 2 per unit area of the molten resin and compress it at a rate of 0.4 cm / s to 0.6 cm / s.

Thus, the compressed molten resin is cooled while maintaining the compressed state (step S4)

At this stage, it is preferable that the time for maintaining the compressed state is based on a time point at which the molten resin reaches the glass transition temperature (T _g ) or lower. That is, the pressurized state is maintained until the molten resin reaches the glass transition temperature (T _g ) or lower.

For example, the time taken for cooling is determined by the thickness of the raw material and the product, and the temperature of the resin and the mold, and may take about 100 to 120 seconds as an example.

When the cooling is completed and the molded product is injection-compression-molded, the mold is opened. (Step S5) The time taken for forming the upper mold 10 and the lower mold 20 is about 10 seconds.

The time taken for taking out the finished molded article from the mold and taking it out is about 15 seconds.

As described above, the injection compression molding method can induce the charging of the resin even at a low pressure, and it is possible to replace the holding pressure by compressing the mold after completion of the charging.

In addition, since the filling and holding pressure are performed at a uniform pressure, the pressure difference of the product can be minimized, the shrinkage difference is reduced, and the deformation is reduced.

Furthermore, since the transferability is excellent even at a low injection pressure, the residual stress can be minimized due to the use of a low filling pressure and a holding pressure, an automobile glass which can not only alleviate the orientation of the resin but also requires high precision and low residual stress Suitable for plastic glazing.

Furthermore, the cycle time is shortened, and the productivity can be greatly improved.

The molded product to be injection-compression molded as described above is plastic glazing for automobile glass, as shown in Fig.

The injection-compression-molded product is made of a transparent plastic substrate 100 made of polycarbonate resin.

In the injection-compression molded product, it is preferable that a coating layer 110 is further formed on the entire surface of the transparent plastic substrate 100 to improve weather resistance and strength. The coating layer 110 may be an organic or inorganic hybrid silica. The method of coating the coating layer 110 is disclosed in the prior art, and thus a detailed description thereof will be omitted.

Furthermore, it is more preferable that a black ceramic painting layer 130 is formed on the coating layer 110 along the rim of the transparent plastic substrate 100. The black ceramic paint layer 130 may be black-out coated by a method such as vapor deposition.

The method of coating the coating layer 110 and the method of forming the black ceramic painting layer 130 are disclosed in the prior art and will not be described in detail.

According to the black glaze-coated plastic glazing for automobile glass as described above, the organic and inorganic hybrid silica coating layer 110 is formed on the polycarbonate which is lighter, easier to handle and superior in mechanical performance than the conventional glass Weatherability and strength can be improved.

Further, since the block ceramic painting layer 130 is subjected to the blackout coaching treatment, adhesion between the vehicle body and the plastic glazing can be ensured, and the merchantability can be enhanced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

10: upper mold 11: upper core
20: lower mold 30: injection duct
31: gate 40: compression core
50: power means 60: power transmission means
61: Compressive force transmitting block 65: Link member
66: link supporting block 70: gate opening / closing means
71: opening / closing block 75: moving means
100: transparent plastic substrate 110: coating layer
130: Painting layer

Claims (2)

Transparent plastic substrate made of a polycarbonate resin;
A coating layer formed on the front surface of the transparent plastic substrate to improve weather resistance and strength; and
Black glazed plastic glazing comprising a; formed on the coating layer, the black ceramic painting layer disposed along the edge of the transparent plastic substrate. The method of claim 1,
The coating layer is an organic, inorganic hybrid silica (hybrid slica) characterized in that the plastic glazing for blackout coated automotive glass.

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